drivers/net/usb/hso.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3  *
   4  * Driver for Option High Speed Mobile Devices.
   5  *
   6  *  Copyright (C) 2008 Option International
   7  *                     Filip Aben <f.aben@option.com>
   8  *                     Denis Joseph Barrow <d.barow@option.com>
   9  *                     Jan Dumon <j.dumon@option.com>
  10  *  Copyright (C) 2007 Andrew Bird (Sphere Systems Ltd)
  11  *                      <ajb@spheresystems.co.uk>
  12  *  Copyright (C) 2008 Greg Kroah-Hartman <gregkh@suse.de>
  13  *  Copyright (C) 2008 Novell, Inc.
  14  *
  15  *****************************************************************************/
  16
  17 /******************************************************************************
  18  *
  19  * Description of the device:
  20  *
  21  * Interface 0: Contains the IP network interface on the bulk end points.
  22  *              The multiplexed serial ports are using the interrupt and
  23  *              control endpoints.
  24  *              Interrupt contains a bitmap telling which multiplexed
  25  *              serialport needs servicing.
  26  *
  27  * Interface 1: Diagnostics port, uses bulk only, do not submit urbs until the
  28  *              port is opened, as this have a huge impact on the network port
  29  *              throughput.
  30  *
  31  * Interface 2: Standard modem interface - circuit switched interface, this
  32  *              can be used to make a standard ppp connection however it
  33  *              should not be used in conjunction with the IP network interface
  34  *              enabled for USB performance reasons i.e. if using this set
  35  *              ideally disable_net=1.
  36  *
  37  *****************************************************************************/
  38
  39 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  40
  41 #include <linux/sched/signal.h>
  42 #include <linux/slab.h>
  43 #include <linux/init.h>
  44 #include <linux/delay.h>
  45 #include <linux/netdevice.h>
  46 #include <linux/module.h>
  47 #include <linux/ethtool.h>
  48 #include <linux/usb.h>
  49 #include <linux/tty.h>
  50 #include <linux/tty_driver.h>
  51 #include <linux/tty_flip.h>
  52 #include <linux/kmod.h>
  53 #include <linux/rfkill.h>
  54 #include <linux/ip.h>
  55 #include <linux/uaccess.h>
  56 #include <linux/usb/cdc.h>
  57 #include <net/arp.h>
  58 #include <asm/byteorder.h>
  59 #include <linux/serial_core.h>
  60 #include <linux/serial.h>
  61
  62
  63 #define MOD_AUTHOR                      "Option Wireless"
  64 #define MOD_DESCRIPTION                 "USB High Speed Option driver"
  65
  66 #define HSO_MAX_NET_DEVICES             10
  67 #define HSO__MAX_MTU                    2048
  68 #define DEFAULT_MTU                     1500
  69 #define DEFAULT_MRU                     1500
  70
  71 #define CTRL_URB_RX_SIZE                1024
  72 #define CTRL_URB_TX_SIZE                64
  73
  74 #define BULK_URB_RX_SIZE                4096
  75 #define BULK_URB_TX_SIZE                8192
  76
  77 #define MUX_BULK_RX_BUF_SIZE            HSO__MAX_MTU
  78 #define MUX_BULK_TX_BUF_SIZE            HSO__MAX_MTU
  79 #define MUX_BULK_RX_BUF_COUNT           4
  80 #define USB_TYPE_OPTION_VENDOR          0x20
  81
  82 /* These definitions are used with the struct hso_net flags element */
  83 /* - use *_bit operations on it. (bit indices not values.) */
  84 #define HSO_NET_RUNNING                 0
  85
  86 #define HSO_NET_TX_TIMEOUT              (HZ*10)
  87
  88 #define HSO_SERIAL_MAGIC                0x48534f31
  89
  90 /* Number of ttys to handle */
  91 #define HSO_SERIAL_TTY_MINORS           256
  92
  93 #define MAX_RX_URBS                     2
  94
  95 /*****************************************************************************/
  96 /* Debugging functions                                                       */
  97 /*****************************************************************************/
  98 #define hso_dbg(lvl, fmt, ...)                                          \
  99 do {                                                                    \
 100         if ((lvl) & debug)                                              \
 101                 pr_info("[%d:%s] " fmt,                                 \
 102                         __LINE__, __func__, ##__VA_ARGS__);             \
 103 } while (0)
 104
 105 /*****************************************************************************/
 106 /* Enumerators                                                               */
 107 /*****************************************************************************/
 108 enum pkt_parse_state {
 109         WAIT_IP,
 110         WAIT_DATA,
 111         WAIT_SYNC
 112 };
 113
 114 /*****************************************************************************/
 115 /* Structs                                                                   */
 116 /*****************************************************************************/
 117
 118 struct hso_shared_int {
 119         struct usb_endpoint_descriptor *intr_endp;
 120         void *shared_intr_buf;
 121         struct urb *shared_intr_urb;
 122         struct usb_device *usb;
 123         int use_count;
 124         int ref_count;
 125         struct mutex shared_int_lock;
 126 };
 127
 128 struct hso_net {
 129         struct hso_device *parent;
 130         struct net_device *net;
 131         struct rfkill *rfkill;
 132         char name[24];
 133
 134         struct usb_endpoint_descriptor *in_endp;
 135         struct usb_endpoint_descriptor *out_endp;
 136
 137         struct urb *mux_bulk_rx_urb_pool[MUX_BULK_RX_BUF_COUNT];
 138         struct urb *mux_bulk_tx_urb;
 139         void *mux_bulk_rx_buf_pool[MUX_BULK_RX_BUF_COUNT];
 140         void *mux_bulk_tx_buf;
 141
 142         struct sk_buff *skb_rx_buf;
 143         struct sk_buff *skb_tx_buf;
 144
 145         enum pkt_parse_state rx_parse_state;
 146         spinlock_t net_lock;
 147
 148         unsigned short rx_buf_size;
 149         unsigned short rx_buf_missing;
 150         struct iphdr rx_ip_hdr;
 151
 152         unsigned long flags;
 153 };
 154
 155 enum rx_ctrl_state{
 156         RX_IDLE,
 157         RX_SENT,
 158         RX_PENDING
 159 };
 160
 161 #define BM_REQUEST_TYPE (0xa1)
 162 #define B_NOTIFICATION  (0x20)
 163 #define W_VALUE         (0x0)
 164 #define W_LENGTH        (0x2)
 165
 166 #define B_OVERRUN       (0x1<<6)
 167 #define B_PARITY        (0x1<<5)
 168 #define B_FRAMING       (0x1<<4)
 169 #define B_RING_SIGNAL   (0x1<<3)
 170 #define B_BREAK         (0x1<<2)
 171 #define B_TX_CARRIER    (0x1<<1)
 172 #define B_RX_CARRIER    (0x1<<0)
 173
 174 struct hso_serial_state_notification {
 175         u8 bmRequestType;
 176         u8 bNotification;
 177         u16 wValue;
 178         u16 wIndex;
 179         u16 wLength;
 180         u16 UART_state_bitmap;
 181 } __packed;
 182
 183 struct hso_tiocmget {
 184         struct mutex mutex;
 185         wait_queue_head_t waitq;
 186         int    intr_completed;
 187         struct usb_endpoint_descriptor *endp;
 188         struct urb *urb;
 189         struct hso_serial_state_notification *serial_state_notification;
 190         u16    prev_UART_state_bitmap;
 191         struct uart_icount icount;
 192 };
 193
 194
 195 struct hso_serial {
 196         struct hso_device *parent;
 197         int magic;
 198         u8 minor;
 199
 200         struct hso_shared_int *shared_int;
 201
 202         /* rx/tx urb could be either a bulk urb or a control urb depending
 203            on which serial port it is used on. */
 204         struct urb *rx_urb[MAX_RX_URBS];
 205         u8 num_rx_urbs;
 206         u8 *rx_data[MAX_RX_URBS];
 207         u16 rx_data_length;     /* should contain allocated length */
 208
 209         struct urb *tx_urb;
 210         u8 *tx_data;
 211         u8 *tx_buffer;
 212         u16 tx_data_length;     /* should contain allocated length */
 213         u16 tx_data_count;
 214         u16 tx_buffer_count;
 215         struct usb_ctrlrequest ctrl_req_tx;
 216         struct usb_ctrlrequest ctrl_req_rx;
 217
 218         struct usb_endpoint_descriptor *in_endp;
 219         struct usb_endpoint_descriptor *out_endp;
 220
 221         enum rx_ctrl_state rx_state;
 222         u8 rts_state;
 223         u8 dtr_state;
 224         unsigned tx_urb_used:1;
 225
 226         struct tty_port port;
 227         /* from usb_serial_port */
 228         spinlock_t serial_lock;
 229
 230         int (*write_data) (struct hso_serial *serial);
 231         struct hso_tiocmget  *tiocmget;
 232         /* Hacks required to get flow control
 233          * working on the serial receive buffers
 234          * so as not to drop characters on the floor.
 235          */
 236         int  curr_rx_urb_idx;
 237         u8   rx_urb_filled[MAX_RX_URBS];
 238         struct tasklet_struct unthrottle_tasklet;
 239 };
 240
 241 struct hso_device {
 242         union {
 243                 struct hso_serial *dev_serial;
 244                 struct hso_net *dev_net;
 245         } port_data;
 246
 247         u32 port_spec;
 248
 249         u8 is_active;
 250         u8 usb_gone;
 251         struct work_struct async_get_intf;
 252         struct work_struct async_put_intf;
 253
 254         struct usb_device *usb;
 255         struct usb_interface *interface;
 256
 257         struct device *dev;
 258         struct kref ref;
 259         struct mutex mutex;
 260 };
 261
 262 /* Type of interface */
 263 #define HSO_INTF_MASK           0xFF00
 264 #define HSO_INTF_MUX            0x0100
 265 #define HSO_INTF_BULK           0x0200
 266
 267 /* Type of port */
 268 #define HSO_PORT_MASK           0xFF
 269 #define HSO_PORT_NO_PORT        0x0
 270 #define HSO_PORT_CONTROL        0x1
 271 #define HSO_PORT_APP            0x2
 272 #define HSO_PORT_GPS            0x3
 273 #define HSO_PORT_PCSC           0x4
 274 #define HSO_PORT_APP2           0x5
 275 #define HSO_PORT_GPS_CONTROL    0x6
 276 #define HSO_PORT_MSD            0x7
 277 #define HSO_PORT_VOICE          0x8
 278 #define HSO_PORT_DIAG2          0x9
 279 #define HSO_PORT_DIAG           0x10
 280 #define HSO_PORT_MODEM          0x11
 281 #define HSO_PORT_NETWORK        0x12
 282
 283 /* Additional device info */
 284 #define HSO_INFO_MASK           0xFF000000
 285 #define HSO_INFO_CRC_BUG        0x01000000
 286
 287 /*****************************************************************************/
 288 /* Prototypes                                                                */
 289 /*****************************************************************************/
 290 /* Serial driver functions */
 291 static int hso_serial_tiocmset(struct tty_struct *tty,
 292                                unsigned int set, unsigned int clear);
 293 static void ctrl_callback(struct urb *urb);
 294 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial);
 295 static void hso_kick_transmit(struct hso_serial *serial);
 296 /* Helper functions */
 297 static int hso_mux_submit_intr_urb(struct hso_shared_int *mux_int,
 298                                    struct usb_device *usb, gfp_t gfp);
 299 static void handle_usb_error(int status, const char *function,
 300                              struct hso_device *hso_dev);
 301 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
 302                                                   int type, int dir);
 303 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports);
 304 static void hso_free_interface(struct usb_interface *intf);
 305 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags);
 306 static int hso_stop_serial_device(struct hso_device *hso_dev);
 307 static int hso_start_net_device(struct hso_device *hso_dev);
 308 static void hso_free_shared_int(struct hso_shared_int *shared_int);
 309 static int hso_stop_net_device(struct hso_device *hso_dev);
 310 static void hso_serial_ref_free(struct kref *ref);
 311 static void hso_std_serial_read_bulk_callback(struct urb *urb);
 312 static int hso_mux_serial_read(struct hso_serial *serial);
 313 static void async_get_intf(struct work_struct *data);
 314 static void async_put_intf(struct work_struct *data);
 315 static int hso_put_activity(struct hso_device *hso_dev);
 316 static int hso_get_activity(struct hso_device *hso_dev);
 317 static void tiocmget_intr_callback(struct urb *urb);
 318 /*****************************************************************************/
 319 /* Helping functions                                                         */
 320 /*****************************************************************************/
 321
 322 /* #define DEBUG */
 323
 324 static inline struct hso_net *dev2net(struct hso_device *hso_dev)
 325 {
 326         return hso_dev->port_data.dev_net;
 327 }
 328
 329 static inline struct hso_serial *dev2ser(struct hso_device *hso_dev)
 330 {
 331         return hso_dev->port_data.dev_serial;
 332 }
 333
 334 /* Debugging functions */
 335 #ifdef DEBUG
 336 static void dbg_dump(int line_count, const char *func_name, unsigned char *buf,
 337                      unsigned int len)
 338 {
 339         static char name[255];
 340
 341         sprintf(name, "hso[%d:%s]", line_count, func_name);
 342         print_hex_dump_bytes(name, DUMP_PREFIX_NONE, buf, len);
 343 }
 344
 345 #define DUMP(buf_, len_)        \
 346         dbg_dump(__LINE__, __func__, (unsigned char *)buf_, len_)
 347
 348 #define DUMP1(buf_, len_)                       \
 349         do {                                    \
 350                 if (0x01 & debug)               \
 351                         DUMP(buf_, len_);       \
 352         } while (0)
 353 #else
 354 #define DUMP(buf_, len_)
 355 #define DUMP1(buf_, len_)
 356 #endif
 357
 358 /* module parameters */
 359 static int debug;
 360 static int tty_major;
 361 static int disable_net;
 362
 363 /* driver info */
 364 static const char driver_name[] = "hso";
 365 static const char tty_filename[] = "ttyHS";
 366 /* the usb driver itself (registered in hso_init) */
 367 static struct usb_driver hso_driver;
 368 /* serial structures */
 369 static struct tty_driver *tty_drv;
 370 static struct hso_device *serial_table[HSO_SERIAL_TTY_MINORS];
 371 static struct hso_device *network_table[HSO_MAX_NET_DEVICES];
 372 static DEFINE_SPINLOCK(serial_table_lock);
 373
 374 static const s32 default_port_spec[] = {
 375         HSO_INTF_MUX | HSO_PORT_NETWORK,
 376         HSO_INTF_BULK | HSO_PORT_DIAG,
 377         HSO_INTF_BULK | HSO_PORT_MODEM,
 378         0
 379 };
 380
 381 static const s32 icon321_port_spec[] = {
 382         HSO_INTF_MUX | HSO_PORT_NETWORK,
 383         HSO_INTF_BULK | HSO_PORT_DIAG2,
 384         HSO_INTF_BULK | HSO_PORT_MODEM,
 385         HSO_INTF_BULK | HSO_PORT_DIAG,
 386         0
 387 };
 388
 389 #define default_port_device(vendor, product)    \
 390         USB_DEVICE(vendor, product),    \
 391                 .driver_info = (kernel_ulong_t)default_port_spec
 392
 393 #define icon321_port_device(vendor, product)    \
 394         USB_DEVICE(vendor, product),    \
 395                 .driver_info = (kernel_ulong_t)icon321_port_spec
 396
 397 /* list of devices we support */
 398 static const struct usb_device_id hso_ids[] = {
 399         {default_port_device(0x0af0, 0x6711)},
 400         {default_port_device(0x0af0, 0x6731)},
 401         {default_port_device(0x0af0, 0x6751)},
 402         {default_port_device(0x0af0, 0x6771)},
 403         {default_port_device(0x0af0, 0x6791)},
 404         {default_port_device(0x0af0, 0x6811)},
 405         {default_port_device(0x0af0, 0x6911)},
 406         {default_port_device(0x0af0, 0x6951)},
 407         {default_port_device(0x0af0, 0x6971)},
 408         {default_port_device(0x0af0, 0x7011)},
 409         {default_port_device(0x0af0, 0x7031)},
 410         {default_port_device(0x0af0, 0x7051)},
 411         {default_port_device(0x0af0, 0x7071)},
 412         {default_port_device(0x0af0, 0x7111)},
 413         {default_port_device(0x0af0, 0x7211)},
 414         {default_port_device(0x0af0, 0x7251)},
 415         {default_port_device(0x0af0, 0x7271)},
 416         {default_port_device(0x0af0, 0x7311)},
 417         {default_port_device(0x0af0, 0xc031)},  /* Icon-Edge */
 418         {icon321_port_device(0x0af0, 0xd013)},  /* Module HSxPA */
 419         {icon321_port_device(0x0af0, 0xd031)},  /* Icon-321 */
 420         {icon321_port_device(0x0af0, 0xd033)},  /* Icon-322 */
 421         {USB_DEVICE(0x0af0, 0x7301)},           /* GE40x */
 422         {USB_DEVICE(0x0af0, 0x7361)},           /* GE40x */
 423         {USB_DEVICE(0x0af0, 0x7381)},           /* GE40x */
 424         {USB_DEVICE(0x0af0, 0x7401)},           /* GI 0401 */
 425         {USB_DEVICE(0x0af0, 0x7501)},           /* GTM 382 */
 426         {USB_DEVICE(0x0af0, 0x7601)},           /* GE40x */
 427         {USB_DEVICE(0x0af0, 0x7701)},
 428         {USB_DEVICE(0x0af0, 0x7706)},
 429         {USB_DEVICE(0x0af0, 0x7801)},
 430         {USB_DEVICE(0x0af0, 0x7901)},
 431         {USB_DEVICE(0x0af0, 0x7A01)},
 432         {USB_DEVICE(0x0af0, 0x7A05)},
 433         {USB_DEVICE(0x0af0, 0x8200)},
 434         {USB_DEVICE(0x0af0, 0x8201)},
 435         {USB_DEVICE(0x0af0, 0x8300)},
 436         {USB_DEVICE(0x0af0, 0x8302)},
 437         {USB_DEVICE(0x0af0, 0x8304)},
 438         {USB_DEVICE(0x0af0, 0x8400)},
 439         {USB_DEVICE(0x0af0, 0x8600)},
 440         {USB_DEVICE(0x0af0, 0x8800)},
 441         {USB_DEVICE(0x0af0, 0x8900)},
 442         {USB_DEVICE(0x0af0, 0x9000)},
 443         {USB_DEVICE(0x0af0, 0x9200)},           /* Option GTM671WFS */
 444         {USB_DEVICE(0x0af0, 0xd035)},
 445         {USB_DEVICE(0x0af0, 0xd055)},
 446         {USB_DEVICE(0x0af0, 0xd155)},
 447         {USB_DEVICE(0x0af0, 0xd255)},
 448         {USB_DEVICE(0x0af0, 0xd057)},
 449         {USB_DEVICE(0x0af0, 0xd157)},
 450         {USB_DEVICE(0x0af0, 0xd257)},
 451         {USB_DEVICE(0x0af0, 0xd357)},
 452         {USB_DEVICE(0x0af0, 0xd058)},
 453         {USB_DEVICE(0x0af0, 0xc100)},
 454         {}
 455 };
 456 MODULE_DEVICE_TABLE(usb, hso_ids);
 457
 458 /* Sysfs attribute */
 459 static ssize_t hsotype_show(struct device *dev,
 460                             struct device_attribute *attr, char *buf)
 461 {
 462         struct hso_device *hso_dev = dev_get_drvdata(dev);
 463         char *port_name;
 464
 465         if (!hso_dev)
 466                 return 0;
 467
 468         switch (hso_dev->port_spec & HSO_PORT_MASK) {
 469         case HSO_PORT_CONTROL:
 470                 port_name = "Control";
 471                 break;
 472         case HSO_PORT_APP:
 473                 port_name = "Application";
 474                 break;
 475         case HSO_PORT_APP2:
 476                 port_name = "Application2";
 477                 break;
 478         case HSO_PORT_GPS:
 479                 port_name = "GPS";
 480                 break;
 481         case HSO_PORT_GPS_CONTROL:
 482                 port_name = "GPS Control";
 483                 break;
 484         case HSO_PORT_PCSC:
 485                 port_name = "PCSC";
 486                 break;
 487         case HSO_PORT_DIAG:
 488                 port_name = "Diagnostic";
 489                 break;
 490         case HSO_PORT_DIAG2:
 491                 port_name = "Diagnostic2";
 492                 break;
 493         case HSO_PORT_MODEM:
 494                 port_name = "Modem";
 495                 break;
 496         case HSO_PORT_NETWORK:
 497                 port_name = "Network";
 498                 break;
 499         default:
 500                 port_name = "Unknown";
 501                 break;
 502         }
 503
 504         return sprintf(buf, "%s\n", port_name);
 505 }
 506 static DEVICE_ATTR_RO(hsotype);
 507
 508 static struct attribute *hso_serial_dev_attrs[] = {
 509         &dev_attr_hsotype.attr,
 510         NULL
 511 };
 512
 513 ATTRIBUTE_GROUPS(hso_serial_dev);
 514
 515 static int hso_urb_to_index(struct hso_serial *serial, struct urb *urb)
 516 {
 517         int idx;
 518
 519         for (idx = 0; idx < serial->num_rx_urbs; idx++)
 520                 if (serial->rx_urb[idx] == urb)
 521                         return idx;
 522         dev_err(serial->parent->dev, "hso_urb_to_index failed\n");
 523         return -1;
 524 }
 525
 526 /* converts mux value to a port spec value */
 527 static u32 hso_mux_to_port(int mux)
 528 {
 529         u32 result;
 530
 531         switch (mux) {
 532         case 0x1:
 533                 result = HSO_PORT_CONTROL;
 534                 break;
 535         case 0x2:
 536                 result = HSO_PORT_APP;
 537                 break;
 538         case 0x4:
 539                 result = HSO_PORT_PCSC;
 540                 break;
 541         case 0x8:
 542                 result = HSO_PORT_GPS;
 543                 break;
 544         case 0x10:
 545                 result = HSO_PORT_APP2;
 546                 break;
 547         default:
 548                 result = HSO_PORT_NO_PORT;
 549         }
 550         return result;
 551 }
 552
 553 /* converts port spec value to a mux value */
 554 static u32 hso_port_to_mux(int port)
 555 {
 556         u32 result;
 557
 558         switch (port & HSO_PORT_MASK) {
 559         case HSO_PORT_CONTROL:
 560                 result = 0x0;
 561                 break;
 562         case HSO_PORT_APP:
 563                 result = 0x1;
 564                 break;
 565         case HSO_PORT_PCSC:
 566                 result = 0x2;
 567                 break;
 568         case HSO_PORT_GPS:
 569                 result = 0x3;
 570                 break;
 571         case HSO_PORT_APP2:
 572                 result = 0x4;
 573                 break;
 574         default:
 575                 result = 0x0;
 576         }
 577         return result;
 578 }
 579
 580 static struct hso_serial *get_serial_by_shared_int_and_type(
 581                                         struct hso_shared_int *shared_int,
 582                                         int mux)
 583 {
 584         int i, port;
 585
 586         port = hso_mux_to_port(mux);
 587
 588         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
 589                 if (serial_table[i] &&
 590                     (dev2ser(serial_table[i])->shared_int == shared_int) &&
 591                     ((serial_table[i]->port_spec & HSO_PORT_MASK) == port)) {
 592                         return dev2ser(serial_table[i]);
 593                 }
 594         }
 595
 596         return NULL;
 597 }
 598
 599 static struct hso_serial *get_serial_by_index(unsigned index)
 600 {
 601         struct hso_serial *serial = NULL;
 602         unsigned long flags;
 603
 604         spin_lock_irqsave(&serial_table_lock, flags);
 605         if (serial_table[index])
 606                 serial = dev2ser(serial_table[index]);
 607         spin_unlock_irqrestore(&serial_table_lock, flags);
 608
 609         return serial;
 610 }
 611
 612 static int obtain_minor(struct hso_serial *serial)
 613 {
 614         int index;
 615         unsigned long flags;
 616
 617         spin_lock_irqsave(&serial_table_lock, flags);
 618         for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
 619                 if (serial_table[index] == NULL) {
 620                         serial_table[index] = serial->parent;
 621                         serial->minor = index;
 622                         spin_unlock_irqrestore(&serial_table_lock, flags);
 623                         return 0;
 624                 }
 625         }
 626         spin_unlock_irqrestore(&serial_table_lock, flags);
 627
 628         pr_err("%s: no free serial devices in table\n", __func__);
 629         return -1;
 630 }
 631
 632 static void release_minor(struct hso_serial *serial)
 633 {
 634         unsigned long flags;
 635
 636         spin_lock_irqsave(&serial_table_lock, flags);
 637         serial_table[serial->minor] = NULL;
 638         spin_unlock_irqrestore(&serial_table_lock, flags);
 639 }
 640
 641 static void handle_usb_error(int status, const char *function,
 642                              struct hso_device *hso_dev)
 643 {
 644         char *explanation;
 645
 646         switch (status) {
 647         case -ENODEV:
 648                 explanation = "no device";
 649                 break;
 650         case -ENOENT:
 651                 explanation = "endpoint not enabled";
 652                 break;
 653         case -EPIPE:
 654                 explanation = "endpoint stalled";
 655                 break;
 656         case -ENOSPC:
 657                 explanation = "not enough bandwidth";
 658                 break;
 659         case -ESHUTDOWN:
 660                 explanation = "device disabled";
 661                 break;
 662         case -EHOSTUNREACH:
 663                 explanation = "device suspended";
 664                 break;
 665         case -EINVAL:
 666         case -EAGAIN:
 667         case -EFBIG:
 668         case -EMSGSIZE:
 669                 explanation = "internal error";
 670                 break;
 671         case -EILSEQ:
 672         case -EPROTO:
 673         case -ETIME:
 674         case -ETIMEDOUT:
 675                 explanation = "protocol error";
 676                 if (hso_dev)
 677                         usb_queue_reset_device(hso_dev->interface);
 678                 break;
 679         default:
 680                 explanation = "unknown status";
 681                 break;
 682         }
 683
 684         /* log a meaningful explanation of an USB status */
 685         hso_dbg(0x1, "%s: received USB status - %s (%d)\n",
 686                 function, explanation, status);
 687 }
 688
 689 /* Network interface functions */
 690
 691 /* called when net interface is brought up by ifconfig */
 692 static int hso_net_open(struct net_device *net)
 693 {
 694         struct hso_net *odev = netdev_priv(net);
 695         unsigned long flags = 0;
 696
 697         if (!odev) {
 698                 dev_err(&net->dev, "No net device !\n");
 699                 return -ENODEV;
 700         }
 701
 702         odev->skb_tx_buf = NULL;
 703
 704         /* setup environment */
 705         spin_lock_irqsave(&odev->net_lock, flags);
 706         odev->rx_parse_state = WAIT_IP;
 707         odev->rx_buf_size = 0;
 708         odev->rx_buf_missing = sizeof(struct iphdr);
 709         spin_unlock_irqrestore(&odev->net_lock, flags);
 710
 711         /* We are up and running. */
 712         set_bit(HSO_NET_RUNNING, &odev->flags);
 713         hso_start_net_device(odev->parent);
 714
 715         /* Tell the kernel we are ready to start receiving from it */
 716         netif_start_queue(net);
 717
 718         return 0;
 719 }
 720
 721 /* called when interface is brought down by ifconfig */
 722 static int hso_net_close(struct net_device *net)
 723 {
 724         struct hso_net *odev = netdev_priv(net);
 725
 726         /* we don't need the queue anymore */
 727         netif_stop_queue(net);
 728         /* no longer running */
 729         clear_bit(HSO_NET_RUNNING, &odev->flags);
 730
 731         hso_stop_net_device(odev->parent);
 732
 733         /* done */
 734         return 0;
 735 }
 736
 737 /* USB tells is xmit done, we should start the netqueue again */
 738 static void write_bulk_callback(struct urb *urb)
 739 {
 740         struct hso_net *odev = urb->context;
 741         int status = urb->status;
 742
 743         /* Sanity check */
 744         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
 745                 dev_err(&urb->dev->dev, "%s: device not running\n", __func__);
 746                 return;
 747         }
 748
 749         /* Do we still have a valid kernel network device? */
 750         if (!netif_device_present(odev->net)) {
 751                 dev_err(&urb->dev->dev, "%s: net device not present\n",
 752                         __func__);
 753                 return;
 754         }
 755
 756         /* log status, but don't act on it, we don't need to resubmit anything
 757          * anyhow */
 758         if (status)
 759                 handle_usb_error(status, __func__, odev->parent);
 760
 761         hso_put_activity(odev->parent);
 762
 763         /* Tell the network interface we are ready for another frame */
 764         netif_wake_queue(odev->net);
 765 }
 766
 767 /* called by kernel when we need to transmit a packet */
 768 static netdev_tx_t hso_net_start_xmit(struct sk_buff *skb,
 769                                             struct net_device *net)
 770 {
 771         struct hso_net *odev = netdev_priv(net);
 772         int result;
 773
 774         /* Tell the kernel, "No more frames 'til we are done with this one." */
 775         netif_stop_queue(net);
 776         if (hso_get_activity(odev->parent) == -EAGAIN) {
 777                 odev->skb_tx_buf = skb;
 778                 return NETDEV_TX_OK;
 779         }
 780
 781         /* log if asked */
 782         DUMP1(skb->data, skb->len);
 783         /* Copy it from kernel memory to OUR memory */
 784         memcpy(odev->mux_bulk_tx_buf, skb->data, skb->len);
 785         hso_dbg(0x1, "len: %d/%d\n", skb->len, MUX_BULK_TX_BUF_SIZE);
 786
 787         /* Fill in the URB for shipping it out. */
 788         usb_fill_bulk_urb(odev->mux_bulk_tx_urb,
 789                           odev->parent->usb,
 790                           usb_sndbulkpipe(odev->parent->usb,
 791                                           odev->out_endp->
 792                                           bEndpointAddress & 0x7F),
 793                           odev->mux_bulk_tx_buf, skb->len, write_bulk_callback,
 794                           odev);
 795
 796         /* Deal with the Zero Length packet problem, I hope */
 797         odev->mux_bulk_tx_urb->transfer_flags |= URB_ZERO_PACKET;
 798
 799         /* Send the URB on its merry way. */
 800         result = usb_submit_urb(odev->mux_bulk_tx_urb, GFP_ATOMIC);
 801         if (result) {
 802                 dev_warn(&odev->parent->interface->dev,
 803                         "failed mux_bulk_tx_urb %d\n", result);
 804                 net->stats.tx_errors++;
 805                 netif_start_queue(net);
 806         } else {
 807                 net->stats.tx_packets++;
 808                 net->stats.tx_bytes += skb->len;
 809         }
 810         dev_kfree_skb(skb);
 811         /* we're done */
 812         return NETDEV_TX_OK;
 813 }
 814
 815 static const struct ethtool_ops ops = {
 816         .get_link = ethtool_op_get_link
 817 };
 818
 819 /* called when a packet did not ack after watchdogtimeout */
 820 static void hso_net_tx_timeout(struct net_device *net, unsigned int txqueue)
 821 {
 822         struct hso_net *odev = netdev_priv(net);
 823
 824         if (!odev)
 825                 return;
 826
 827         /* Tell syslog we are hosed. */
 828         dev_warn(&net->dev, "Tx timed out.\n");
 829
 830         /* Tear the waiting frame off the list */
 831         if (odev->mux_bulk_tx_urb)
 832                 usb_unlink_urb(odev->mux_bulk_tx_urb);
 833
 834         /* Update statistics */
 835         net->stats.tx_errors++;
 836 }
 837
 838 /* make a real packet from the received USB buffer */
 839 static void packetizeRx(struct hso_net *odev, unsigned char *ip_pkt,
 840                         unsigned int count, unsigned char is_eop)
 841 {
 842         unsigned short temp_bytes;
 843         unsigned short buffer_offset = 0;
 844         unsigned short frame_len;
 845
 846         /* log if needed */
 847         hso_dbg(0x1, "Rx %d bytes\n", count);
 848         DUMP(ip_pkt, min(128, (int)count));
 849
 850         while (count) {
 851                 switch (odev->rx_parse_state) {
 852                 case WAIT_IP:
 853                         /* waiting for IP header. */
 854                         /* wanted bytes - size of ip header */
 855                         temp_bytes =
 856                             (count <
 857                              odev->rx_buf_missing) ? count : odev->
 858                             rx_buf_missing;
 859
 860                         memcpy(((unsigned char *)(&odev->rx_ip_hdr)) +
 861                                odev->rx_buf_size, ip_pkt + buffer_offset,
 862                                temp_bytes);
 863
 864                         odev->rx_buf_size += temp_bytes;
 865                         buffer_offset += temp_bytes;
 866                         odev->rx_buf_missing -= temp_bytes;
 867                         count -= temp_bytes;
 868
 869                         if (!odev->rx_buf_missing) {
 870                                 /* header is complete allocate an sk_buffer and
 871                                  * continue to WAIT_DATA */
 872                                 frame_len = ntohs(odev->rx_ip_hdr.tot_len);
 873
 874                                 if ((frame_len > DEFAULT_MRU) ||
 875                                     (frame_len < sizeof(struct iphdr))) {
 876                                         dev_err(&odev->net->dev,
 877                                                 "Invalid frame (%d) length\n",
 878                                                 frame_len);
 879                                         odev->rx_parse_state = WAIT_SYNC;
 880                                         continue;
 881                                 }
 882                                 /* Allocate an sk_buff */
 883                                 odev->skb_rx_buf = netdev_alloc_skb(odev->net,
 884                                                                     frame_len);
 885                                 if (!odev->skb_rx_buf) {
 886                                         /* We got no receive buffer. */
 887                                         hso_dbg(0x1, "could not allocate memory\n");
 888                                         odev->rx_parse_state = WAIT_SYNC;
 889                                         continue;
 890                                 }
 891
 892                                 /* Copy what we got so far. make room for iphdr
 893                                  * after tail. */
 894                                 skb_put_data(odev->skb_rx_buf,
 895                                              (char *)&(odev->rx_ip_hdr),
 896                                              sizeof(struct iphdr));
 897
 898                                 /* ETH_HLEN */
 899                                 odev->rx_buf_size = sizeof(struct iphdr);
 900
 901                                 /* Filip actually use .tot_len */
 902                                 odev->rx_buf_missing =
 903                                     frame_len - sizeof(struct iphdr);
 904                                 odev->rx_parse_state = WAIT_DATA;
 905                         }
 906                         break;
 907
 908                 case WAIT_DATA:
 909                         temp_bytes = (count < odev->rx_buf_missing)
 910                                         ? count : odev->rx_buf_missing;
 911
 912                         /* Copy the rest of the bytes that are left in the
 913                          * buffer into the waiting sk_buf. */
 914                         /* Make room for temp_bytes after tail. */
 915                         skb_put_data(odev->skb_rx_buf,
 916                                      ip_pkt + buffer_offset,
 917                                      temp_bytes);
 918
 919                         odev->rx_buf_missing -= temp_bytes;
 920                         count -= temp_bytes;
 921                         buffer_offset += temp_bytes;
 922                         odev->rx_buf_size += temp_bytes;
 923                         if (!odev->rx_buf_missing) {
 924                                 /* Packet is complete. Inject into stack. */
 925                                 /* We have IP packet here */
 926                                 odev->skb_rx_buf->protocol = cpu_to_be16(ETH_P_IP);
 927                                 skb_reset_mac_header(odev->skb_rx_buf);
 928
 929                                 /* Ship it off to the kernel */
 930                                 netif_rx(odev->skb_rx_buf);
 931                                 /* No longer our buffer. */
 932                                 odev->skb_rx_buf = NULL;
 933
 934                                 /* update out statistics */
 935                                 odev->net->stats.rx_packets++;
 936
 937                                 odev->net->stats.rx_bytes += odev->rx_buf_size;
 938
 939                                 odev->rx_buf_size = 0;
 940                                 odev->rx_buf_missing = sizeof(struct iphdr);
 941                                 odev->rx_parse_state = WAIT_IP;
 942                         }
 943                         break;
 944
 945                 case WAIT_SYNC:
 946                         hso_dbg(0x1, " W_S\n");
 947                         count = 0;
 948                         break;
 949                 default:
 950                         hso_dbg(0x1, "\n");
 951                         count--;
 952                         break;
 953                 }
 954         }
 955
 956         /* Recovery mechanism for WAIT_SYNC state. */
 957         if (is_eop) {
 958                 if (odev->rx_parse_state == WAIT_SYNC) {
 959                         odev->rx_parse_state = WAIT_IP;
 960                         odev->rx_buf_size = 0;
 961                         odev->rx_buf_missing = sizeof(struct iphdr);
 962                 }
 963         }
 964 }
 965
 966 static void fix_crc_bug(struct urb *urb, __le16 max_packet_size)
 967 {
 968         static const u8 crc_check[4] = { 0xDE, 0xAD, 0xBE, 0xEF };
 969         u32 rest = urb->actual_length % le16_to_cpu(max_packet_size);
 970
 971         if (((rest == 5) || (rest == 6)) &&
 972             !memcmp(((u8 *)urb->transfer_buffer) + urb->actual_length - 4,
 973                     crc_check, 4)) {
 974                 urb->actual_length -= 4;
 975         }
 976 }
 977
 978 /* Moving data from usb to kernel (in interrupt state) */
 979 static void read_bulk_callback(struct urb *urb)
 980 {
 981         struct hso_net *odev = urb->context;
 982         struct net_device *net;
 983         int result;
 984         unsigned long flags;
 985         int status = urb->status;
 986
 987         /* is al ok?  (Filip: Who's Al ?) */
 988         if (status) {
 989                 handle_usb_error(status, __func__, odev->parent);
 990                 return;
 991         }
 992
 993         /* Sanity check */
 994         if (!odev || !test_bit(HSO_NET_RUNNING, &odev->flags)) {
 995                 hso_dbg(0x1, "BULK IN callback but driver is not active!\n");
 996                 return;
 997         }
 998         usb_mark_last_busy(urb->dev);
 999
1000         net = odev->net;
1001
1002         if (!netif_device_present(net)) {
1003                 /* Somebody killed our network interface... */
1004                 return;
1005         }
1006
1007         if (odev->parent->port_spec & HSO_INFO_CRC_BUG)
1008                 fix_crc_bug(urb, odev->in_endp->wMaxPacketSize);
1009
1010         /* do we even have a packet? */
1011         if (urb->actual_length) {
1012                 /* Handle the IP stream, add header and push it onto network
1013                  * stack if the packet is complete. */
1014                 spin_lock_irqsave(&odev->net_lock, flags);
1015                 packetizeRx(odev, urb->transfer_buffer, urb->actual_length,
1016                             (urb->transfer_buffer_length >
1017                              urb->actual_length) ? 1 : 0);
1018                 spin_unlock_irqrestore(&odev->net_lock, flags);
1019         }
1020
1021         /* We are done with this URB, resubmit it. Prep the USB to wait for
1022          * another frame. Reuse same as received. */
1023         usb_fill_bulk_urb(urb,
1024                           odev->parent->usb,
1025                           usb_rcvbulkpipe(odev->parent->usb,
1026                                           odev->in_endp->
1027                                           bEndpointAddress & 0x7F),
1028                           urb->transfer_buffer, MUX_BULK_RX_BUF_SIZE,
1029                           read_bulk_callback, odev);
1030
1031         /* Give this to the USB subsystem so it can tell us when more data
1032          * arrives. */
1033         result = usb_submit_urb(urb, GFP_ATOMIC);
1034         if (result)
1035                 dev_warn(&odev->parent->interface->dev,
1036                          "%s failed submit mux_bulk_rx_urb %d\n", __func__,
1037                          result);
1038 }
1039
1040 /* Serial driver functions */
1041
1042 static void hso_init_termios(struct ktermios *termios)
1043 {
1044         /*
1045          * The default requirements for this device are:
1046          */
1047         termios->c_iflag &=
1048                 ~(IGNBRK        /* disable ignore break */
1049                 | BRKINT        /* disable break causes interrupt */
1050                 | PARMRK        /* disable mark parity errors */
1051                 | ISTRIP        /* disable clear high bit of input characters */
1052                 | INLCR         /* disable translate NL to CR */
1053                 | IGNCR         /* disable ignore CR */
1054                 | ICRNL         /* disable translate CR to NL */
1055                 | IXON);        /* disable enable XON/XOFF flow control */
1056
1057         /* disable postprocess output characters */
1058         termios->c_oflag &= ~OPOST;
1059
1060         termios->c_lflag &=
1061                 ~(ECHO          /* disable echo input characters */
1062                 | ECHONL        /* disable echo new line */
1063                 | ICANON        /* disable erase, kill, werase, and rprnt
1064                                    special characters */
1065                 | ISIG          /* disable interrupt, quit, and suspend special
1066                                    characters */
1067                 | IEXTEN);      /* disable non-POSIX special characters */
1068
1069         termios->c_cflag &=
1070                 ~(CSIZE         /* no size */
1071                 | PARENB        /* disable parity bit */
1072                 | CBAUD         /* clear current baud rate */
1073                 | CBAUDEX);     /* clear current buad rate */
1074
1075         termios->c_cflag |= CS8;        /* character size 8 bits */
1076
1077         /* baud rate 115200 */
1078         tty_termios_encode_baud_rate(termios, 115200, 115200);
1079 }
1080
1081 static void _hso_serial_set_termios(struct tty_struct *tty)
1082 {
1083         struct hso_serial *serial = tty->driver_data;
1084
1085         if (!serial) {
1086                 pr_err("%s: no tty structures", __func__);
1087                 return;
1088         }
1089
1090         hso_dbg(0x8, "port %d\n", serial->minor);
1091
1092         /*
1093          *      Fix up unsupported bits
1094          */
1095         tty->termios.c_iflag &= ~IXON; /* disable enable XON/XOFF flow control */
1096
1097         tty->termios.c_cflag &=
1098                 ~(CSIZE         /* no size */
1099                 | PARENB        /* disable parity bit */
1100                 | CBAUD         /* clear current baud rate */
1101                 | CBAUDEX);     /* clear current buad rate */
1102
1103         tty->termios.c_cflag |= CS8;    /* character size 8 bits */
1104
1105         /* baud rate 115200 */
1106         tty_encode_baud_rate(tty, 115200, 115200);
1107 }
1108
1109 static void hso_resubmit_rx_bulk_urb(struct hso_serial *serial, struct urb *urb)
1110 {
1111         int result;
1112         /* We are done with this URB, resubmit it. Prep the USB to wait for
1113          * another frame */
1114         usb_fill_bulk_urb(urb, serial->parent->usb,
1115                           usb_rcvbulkpipe(serial->parent->usb,
1116                                           serial->in_endp->
1117                                           bEndpointAddress & 0x7F),
1118                           urb->transfer_buffer, serial->rx_data_length,
1119                           hso_std_serial_read_bulk_callback, serial);
1120         /* Give this to the USB subsystem so it can tell us when more data
1121          * arrives. */
1122         result = usb_submit_urb(urb, GFP_ATOMIC);
1123         if (result) {
1124                 dev_err(&urb->dev->dev, "%s failed submit serial rx_urb %d\n",
1125                         __func__, result);
1126         }
1127 }
1128
1129
1130
1131
1132 static void put_rxbuf_data_and_resubmit_bulk_urb(struct hso_serial *serial)
1133 {
1134         int count;
1135         struct urb *curr_urb;
1136
1137         while (serial->rx_urb_filled[serial->curr_rx_urb_idx]) {
1138                 curr_urb = serial->rx_urb[serial->curr_rx_urb_idx];
1139                 count = put_rxbuf_data(curr_urb, serial);
1140                 if (count == -1)
1141                         return;
1142                 if (count == 0) {
1143                         serial->curr_rx_urb_idx++;
1144                         if (serial->curr_rx_urb_idx >= serial->num_rx_urbs)
1145                                 serial->curr_rx_urb_idx = 0;
1146                         hso_resubmit_rx_bulk_urb(serial, curr_urb);
1147                 }
1148         }
1149 }
1150
1151 static void put_rxbuf_data_and_resubmit_ctrl_urb(struct hso_serial *serial)
1152 {
1153         int count = 0;
1154         struct urb *urb;
1155
1156         urb = serial->rx_urb[0];
1157         if (serial->port.count > 0) {
1158                 count = put_rxbuf_data(urb, serial);
1159                 if (count == -1)
1160                         return;
1161         }
1162         /* Re issue a read as long as we receive data. */
1163
1164         if (count == 0 && ((urb->actual_length != 0) ||
1165                            (serial->rx_state == RX_PENDING))) {
1166                 serial->rx_state = RX_SENT;
1167                 hso_mux_serial_read(serial);
1168         } else
1169                 serial->rx_state = RX_IDLE;
1170 }
1171
1172
1173 /* read callback for Diag and CS port */
1174 static void hso_std_serial_read_bulk_callback(struct urb *urb)
1175 {
1176         struct hso_serial *serial = urb->context;
1177         int status = urb->status;
1178         unsigned long flags;
1179
1180         hso_dbg(0x8, "--- Got serial_read_bulk callback %02x ---\n", status);
1181
1182         /* sanity check */
1183         if (!serial) {
1184                 hso_dbg(0x1, "serial == NULL\n");
1185                 return;
1186         }
1187         if (status) {
1188                 handle_usb_error(status, __func__, serial->parent);
1189                 return;
1190         }
1191
1192         hso_dbg(0x1, "Actual length = %d\n", urb->actual_length);
1193         DUMP1(urb->transfer_buffer, urb->actual_length);
1194
1195         /* Anyone listening? */
1196         if (serial->port.count == 0)
1197                 return;
1198
1199         if (serial->parent->port_spec & HSO_INFO_CRC_BUG)
1200                 fix_crc_bug(urb, serial->in_endp->wMaxPacketSize);
1201         /* Valid data, handle RX data */
1202         spin_lock_irqsave(&serial->serial_lock, flags);
1203         serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 1;
1204         put_rxbuf_data_and_resubmit_bulk_urb(serial);
1205         spin_unlock_irqrestore(&serial->serial_lock, flags);
1206 }
1207
1208 /*
1209  * This needs to be a tasklet otherwise we will
1210  * end up recursively calling this function.
1211  */
1212 static void hso_unthrottle_tasklet(struct tasklet_struct *t)
1213 {
1214         struct hso_serial *serial = from_tasklet(serial, t,
1215                                                  unthrottle_tasklet);
1216         unsigned long flags;
1217
1218         spin_lock_irqsave(&serial->serial_lock, flags);
1219         if ((serial->parent->port_spec & HSO_INTF_MUX))
1220                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1221         else
1222                 put_rxbuf_data_and_resubmit_bulk_urb(serial);
1223         spin_unlock_irqrestore(&serial->serial_lock, flags);
1224 }
1225
1226 static  void hso_unthrottle(struct tty_struct *tty)
1227 {
1228         struct hso_serial *serial = tty->driver_data;
1229
1230         tasklet_hi_schedule(&serial->unthrottle_tasklet);
1231 }
1232
1233 /* open the requested serial port */
1234 static int hso_serial_open(struct tty_struct *tty, struct file *filp)
1235 {
1236         struct hso_serial *serial = get_serial_by_index(tty->index);
1237         int result;
1238
1239         /* sanity check */
1240         if (serial == NULL || serial->magic != HSO_SERIAL_MAGIC) {
1241                 WARN_ON(1);
1242                 tty->driver_data = NULL;
1243                 hso_dbg(0x1, "Failed to open port\n");
1244                 return -ENODEV;
1245         }
1246
1247         mutex_lock(&serial->parent->mutex);
1248         result = usb_autopm_get_interface(serial->parent->interface);
1249         if (result < 0)
1250                 goto err_out;
1251
1252         hso_dbg(0x1, "Opening %d\n", serial->minor);
1253
1254         /* setup */
1255         tty->driver_data = serial;
1256         tty_port_tty_set(&serial->port, tty);
1257
1258         /* check for port already opened, if not set the termios */
1259         serial->port.count++;
1260         if (serial->port.count == 1) {
1261                 serial->rx_state = RX_IDLE;
1262                 /* Force default termio settings */
1263                 _hso_serial_set_termios(tty);
1264                 tasklet_setup(&serial->unthrottle_tasklet,
1265                               hso_unthrottle_tasklet);
1266                 result = hso_start_serial_device(serial->parent, GFP_KERNEL);
1267                 if (result) {
1268                         hso_stop_serial_device(serial->parent);
1269                         serial->port.count--;
1270                 } else {
1271                         kref_get(&serial->parent->ref);
1272                 }
1273         } else {
1274                 hso_dbg(0x1, "Port was already open\n");
1275         }
1276
1277         usb_autopm_put_interface(serial->parent->interface);
1278
1279         /* done */
1280         if (result)
1281                 hso_serial_tiocmset(tty, TIOCM_RTS | TIOCM_DTR, 0);
1282 err_out:
1283         mutex_unlock(&serial->parent->mutex);
1284         return result;
1285 }
1286
1287 /* close the requested serial port */
1288 static void hso_serial_close(struct tty_struct *tty, struct file *filp)
1289 {
1290         struct hso_serial *serial = tty->driver_data;
1291         u8 usb_gone;
1292
1293         hso_dbg(0x1, "Closing serial port\n");
1294
1295         /* Open failed, no close cleanup required */
1296         if (serial == NULL)
1297                 return;
1298
1299         mutex_lock(&serial->parent->mutex);
1300         usb_gone = serial->parent->usb_gone;
1301
1302         if (!usb_gone)
1303                 usb_autopm_get_interface(serial->parent->interface);
1304
1305         /* reset the rts and dtr */
1306         /* do the actual close */
1307         serial->port.count--;
1308
1309         if (serial->port.count <= 0) {
1310                 serial->port.count = 0;
1311                 tty_port_tty_set(&serial->port, NULL);
1312                 if (!usb_gone)
1313                         hso_stop_serial_device(serial->parent);
1314                 tasklet_kill(&serial->unthrottle_tasklet);
1315         }
1316
1317         if (!usb_gone)
1318                 usb_autopm_put_interface(serial->parent->interface);
1319
1320         mutex_unlock(&serial->parent->mutex);
1321 }
1322
1323 /* close the requested serial port */
1324 static ssize_t hso_serial_write(struct tty_struct *tty, const u8 *buf,
1325                                 size_t count)
1326 {
1327         struct hso_serial *serial = tty->driver_data;
1328         unsigned long flags;
1329
1330         /* sanity check */
1331         if (serial == NULL) {
1332                 pr_err("%s: serial is NULL\n", __func__);
1333                 return -ENODEV;
1334         }
1335
1336         spin_lock_irqsave(&serial->serial_lock, flags);
1337
1338         count = min_t(size_t, serial->tx_data_length - serial->tx_buffer_count,
1339                       count);
1340         memcpy(serial->tx_buffer + serial->tx_buffer_count, buf, count);
1341         serial->tx_buffer_count += count;
1342
1343         spin_unlock_irqrestore(&serial->serial_lock, flags);
1344
1345         hso_kick_transmit(serial);
1346         /* done */
1347         return count;
1348 }
1349
1350 /* how much room is there for writing */
1351 static unsigned int hso_serial_write_room(struct tty_struct *tty)
1352 {
1353         struct hso_serial *serial = tty->driver_data;
1354         unsigned int room;
1355         unsigned long flags;
1356
1357         spin_lock_irqsave(&serial->serial_lock, flags);
1358         room = serial->tx_data_length - serial->tx_buffer_count;
1359         spin_unlock_irqrestore(&serial->serial_lock, flags);
1360
1361         /* return free room */
1362         return room;
1363 }
1364
1365 static void hso_serial_cleanup(struct tty_struct *tty)
1366 {
1367         struct hso_serial *serial = tty->driver_data;
1368
1369         if (!serial)
1370                 return;
1371
1372         kref_put(&serial->parent->ref, hso_serial_ref_free);
1373 }
1374
1375 /* setup the term */
1376 static void hso_serial_set_termios(struct tty_struct *tty,
1377                                    const struct ktermios *old)
1378 {
1379         struct hso_serial *serial = tty->driver_data;
1380         unsigned long flags;
1381
1382         if (old)
1383                 hso_dbg(0x16, "Termios called with: cflags new[%u] - old[%u]\n",
1384                         (unsigned int)tty->termios.c_cflag,
1385                         (unsigned int)old->c_cflag);
1386
1387         /* the actual setup */
1388         spin_lock_irqsave(&serial->serial_lock, flags);
1389         if (serial->port.count)
1390                 _hso_serial_set_termios(tty);
1391         else
1392                 tty->termios = *old;
1393         spin_unlock_irqrestore(&serial->serial_lock, flags);
1394
1395         /* done */
1396 }
1397
1398 /* how many characters in the buffer */
1399 static unsigned int hso_serial_chars_in_buffer(struct tty_struct *tty)
1400 {
1401         struct hso_serial *serial = tty->driver_data;
1402         unsigned long flags;
1403         unsigned int chars;
1404
1405         /* sanity check */
1406         if (serial == NULL)
1407                 return 0;
1408
1409         spin_lock_irqsave(&serial->serial_lock, flags);
1410         chars = serial->tx_buffer_count;
1411         spin_unlock_irqrestore(&serial->serial_lock, flags);
1412
1413         return chars;
1414 }
1415 static int tiocmget_submit_urb(struct hso_serial *serial,
1416                                struct hso_tiocmget *tiocmget,
1417                                struct usb_device *usb)
1418 {
1419         int result;
1420
1421         if (serial->parent->usb_gone)
1422                 return -ENODEV;
1423         usb_fill_int_urb(tiocmget->urb, usb,
1424                          usb_rcvintpipe(usb,
1425                                         tiocmget->endp->
1426                                         bEndpointAddress & 0x7F),
1427                          tiocmget->serial_state_notification,
1428                          sizeof(struct hso_serial_state_notification),
1429                          tiocmget_intr_callback, serial,
1430                          tiocmget->endp->bInterval);
1431         result = usb_submit_urb(tiocmget->urb, GFP_ATOMIC);
1432         if (result) {
1433                 dev_warn(&usb->dev, "%s usb_submit_urb failed %d\n", __func__,
1434                          result);
1435         }
1436         return result;
1437
1438 }
1439
1440 static void tiocmget_intr_callback(struct urb *urb)
1441 {
1442         struct hso_serial *serial = urb->context;
1443         struct hso_tiocmget *tiocmget;
1444         int status = urb->status;
1445         u16 UART_state_bitmap, prev_UART_state_bitmap;
1446         struct uart_icount *icount;
1447         struct hso_serial_state_notification *serial_state_notification;
1448         struct usb_device *usb;
1449         struct usb_interface *interface;
1450         int if_num;
1451
1452         /* Sanity checks */
1453         if (!serial)
1454                 return;
1455         if (status) {
1456                 handle_usb_error(status, __func__, serial->parent);
1457                 return;
1458         }
1459
1460         /* tiocmget is only supported on HSO_PORT_MODEM */
1461         tiocmget = serial->tiocmget;
1462         if (!tiocmget)
1463                 return;
1464         BUG_ON((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM);
1465
1466         usb = serial->parent->usb;
1467         interface = serial->parent->interface;
1468
1469         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1470
1471         /* wIndex should be the USB interface number of the port to which the
1472          * notification applies, which should always be the Modem port.
1473          */
1474         serial_state_notification = tiocmget->serial_state_notification;
1475         if (serial_state_notification->bmRequestType != BM_REQUEST_TYPE ||
1476             serial_state_notification->bNotification != B_NOTIFICATION ||
1477             le16_to_cpu(serial_state_notification->wValue) != W_VALUE ||
1478             le16_to_cpu(serial_state_notification->wIndex) != if_num ||
1479             le16_to_cpu(serial_state_notification->wLength) != W_LENGTH) {
1480                 dev_warn(&usb->dev,
1481                          "hso received invalid serial state notification\n");
1482                 DUMP(serial_state_notification,
1483                      sizeof(struct hso_serial_state_notification));
1484         } else {
1485                 unsigned long flags;
1486
1487                 UART_state_bitmap = le16_to_cpu(serial_state_notification->
1488                                                 UART_state_bitmap);
1489                 prev_UART_state_bitmap = tiocmget->prev_UART_state_bitmap;
1490                 icount = &tiocmget->icount;
1491                 spin_lock_irqsave(&serial->serial_lock, flags);
1492                 if ((UART_state_bitmap & B_OVERRUN) !=
1493                    (prev_UART_state_bitmap & B_OVERRUN))
1494                         icount->parity++;
1495                 if ((UART_state_bitmap & B_PARITY) !=
1496                    (prev_UART_state_bitmap & B_PARITY))
1497                         icount->parity++;
1498                 if ((UART_state_bitmap & B_FRAMING) !=
1499                    (prev_UART_state_bitmap & B_FRAMING))
1500                         icount->frame++;
1501                 if ((UART_state_bitmap & B_RING_SIGNAL) &&
1502                    !(prev_UART_state_bitmap & B_RING_SIGNAL))
1503                         icount->rng++;
1504                 if ((UART_state_bitmap & B_BREAK) !=
1505                    (prev_UART_state_bitmap & B_BREAK))
1506                         icount->brk++;
1507                 if ((UART_state_bitmap & B_TX_CARRIER) !=
1508                    (prev_UART_state_bitmap & B_TX_CARRIER))
1509                         icount->dsr++;
1510                 if ((UART_state_bitmap & B_RX_CARRIER) !=
1511                    (prev_UART_state_bitmap & B_RX_CARRIER))
1512                         icount->dcd++;
1513                 tiocmget->prev_UART_state_bitmap = UART_state_bitmap;
1514                 spin_unlock_irqrestore(&serial->serial_lock, flags);
1515                 tiocmget->intr_completed = 1;
1516                 wake_up_interruptible(&tiocmget->waitq);
1517         }
1518         memset(serial_state_notification, 0,
1519                sizeof(struct hso_serial_state_notification));
1520         tiocmget_submit_urb(serial,
1521                             tiocmget,
1522                             serial->parent->usb);
1523 }
1524
1525 /*
1526  * next few functions largely stolen from drivers/serial/serial_core.c
1527  */
1528 /* Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1529  * - mask passed in arg for lines of interest
1530  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1531  * Caller should use TIOCGICOUNT to see which one it was
1532  */
1533 static int
1534 hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
1535 {
1536         DECLARE_WAITQUEUE(wait, current);
1537         struct uart_icount cprev, cnow;
1538         struct hso_tiocmget  *tiocmget;
1539         int ret;
1540
1541         tiocmget = serial->tiocmget;
1542         if (!tiocmget)
1543                 return -ENOENT;
1544         /*
1545          * note the counters on entry
1546          */
1547         spin_lock_irq(&serial->serial_lock);
1548         memcpy(&cprev, &tiocmget->icount, sizeof(struct uart_icount));
1549         spin_unlock_irq(&serial->serial_lock);
1550         add_wait_queue(&tiocmget->waitq, &wait);
1551         for (;;) {
1552                 spin_lock_irq(&serial->serial_lock);
1553                 memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1554                 spin_unlock_irq(&serial->serial_lock);
1555                 set_current_state(TASK_INTERRUPTIBLE);
1556                 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1557                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1558                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd))) {
1559                         ret = 0;
1560                         break;
1561                 }
1562                 schedule();
1563                 /* see if a signal did it */
1564                 if (signal_pending(current)) {
1565                         ret = -ERESTARTSYS;
1566                         break;
1567                 }
1568                 cprev = cnow;
1569         }
1570         __set_current_state(TASK_RUNNING);
1571         remove_wait_queue(&tiocmget->waitq, &wait);
1572
1573         return ret;
1574 }
1575
1576 /*
1577  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1578  * Return: write counters to the user passed counter struct
1579  * NB: both 1->0 and 0->1 transitions are counted except for
1580  *     RI where only 0->1 is counted.
1581  */
1582 static int hso_get_count(struct tty_struct *tty,
1583                   struct serial_icounter_struct *icount)
1584 {
1585         struct uart_icount cnow;
1586         struct hso_serial *serial = tty->driver_data;
1587         struct hso_tiocmget  *tiocmget = serial->tiocmget;
1588
1589         memset(icount, 0, sizeof(struct serial_icounter_struct));
1590
1591         if (!tiocmget)
1592                  return -ENOENT;
1593         spin_lock_irq(&serial->serial_lock);
1594         memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
1595         spin_unlock_irq(&serial->serial_lock);
1596
1597         icount->cts         = cnow.cts;
1598         icount->dsr         = cnow.dsr;
1599         icount->rng         = cnow.rng;
1600         icount->dcd         = cnow.dcd;
1601         icount->rx          = cnow.rx;
1602         icount->tx          = cnow.tx;
1603         icount->frame       = cnow.frame;
1604         icount->overrun     = cnow.overrun;
1605         icount->parity      = cnow.parity;
1606         icount->brk         = cnow.brk;
1607         icount->buf_overrun = cnow.buf_overrun;
1608
1609         return 0;
1610 }
1611
1612
1613 static int hso_serial_tiocmget(struct tty_struct *tty)
1614 {
1615         int retval;
1616         struct hso_serial *serial = tty->driver_data;
1617         struct hso_tiocmget  *tiocmget;
1618         u16 UART_state_bitmap;
1619
1620         /* sanity check */
1621         if (!serial) {
1622                 hso_dbg(0x1, "no tty structures\n");
1623                 return -EINVAL;
1624         }
1625         spin_lock_irq(&serial->serial_lock);
1626         retval = ((serial->rts_state) ? TIOCM_RTS : 0) |
1627             ((serial->dtr_state) ? TIOCM_DTR : 0);
1628         tiocmget = serial->tiocmget;
1629         if (tiocmget) {
1630
1631                 UART_state_bitmap = le16_to_cpu(
1632                         tiocmget->prev_UART_state_bitmap);
1633                 if (UART_state_bitmap & B_RING_SIGNAL)
1634                         retval |=  TIOCM_RNG;
1635                 if (UART_state_bitmap & B_RX_CARRIER)
1636                         retval |=  TIOCM_CD;
1637                 if (UART_state_bitmap & B_TX_CARRIER)
1638                         retval |=  TIOCM_DSR;
1639         }
1640         spin_unlock_irq(&serial->serial_lock);
1641         return retval;
1642 }
1643
1644 static int hso_serial_tiocmset(struct tty_struct *tty,
1645                                unsigned int set, unsigned int clear)
1646 {
1647         int val = 0;
1648         unsigned long flags;
1649         int if_num;
1650         struct hso_serial *serial = tty->driver_data;
1651         struct usb_interface *interface;
1652
1653         /* sanity check */
1654         if (!serial) {
1655                 hso_dbg(0x1, "no tty structures\n");
1656                 return -EINVAL;
1657         }
1658
1659         if ((serial->parent->port_spec & HSO_PORT_MASK) != HSO_PORT_MODEM)
1660                 return -EINVAL;
1661
1662         interface = serial->parent->interface;
1663         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
1664
1665         spin_lock_irqsave(&serial->serial_lock, flags);
1666         if (set & TIOCM_RTS)
1667                 serial->rts_state = 1;
1668         if (set & TIOCM_DTR)
1669                 serial->dtr_state = 1;
1670
1671         if (clear & TIOCM_RTS)
1672                 serial->rts_state = 0;
1673         if (clear & TIOCM_DTR)
1674                 serial->dtr_state = 0;
1675
1676         if (serial->dtr_state)
1677                 val |= 0x01;
1678         if (serial->rts_state)
1679                 val |= 0x02;
1680
1681         spin_unlock_irqrestore(&serial->serial_lock, flags);
1682
1683         return usb_control_msg(serial->parent->usb,
1684                                usb_sndctrlpipe(serial->parent->usb, 0), 0x22,
1685                                0x21, val, if_num, NULL, 0,
1686                                USB_CTRL_SET_TIMEOUT);
1687 }
1688
1689 static int hso_serial_ioctl(struct tty_struct *tty,
1690                             unsigned int cmd, unsigned long arg)
1691 {
1692         struct hso_serial *serial = tty->driver_data;
1693         int ret = 0;
1694         hso_dbg(0x8, "IOCTL cmd: %d, arg: %ld\n", cmd, arg);
1695
1696         if (!serial)
1697                 return -ENODEV;
1698         switch (cmd) {
1699         case TIOCMIWAIT:
1700                 ret = hso_wait_modem_status(serial, arg);
1701                 break;
1702         default:
1703                 ret = -ENOIOCTLCMD;
1704                 break;
1705         }
1706         return ret;
1707 }
1708
1709
1710 /* starts a transmit */
1711 static void hso_kick_transmit(struct hso_serial *serial)
1712 {
1713         unsigned long flags;
1714         int res;
1715
1716         spin_lock_irqsave(&serial->serial_lock, flags);
1717         if (!serial->tx_buffer_count)
1718                 goto out;
1719
1720         if (serial->tx_urb_used)
1721                 goto out;
1722
1723         /* Wakeup USB interface if necessary */
1724         if (hso_get_activity(serial->parent) == -EAGAIN)
1725                 goto out;
1726
1727         /* Switch pointers around to avoid memcpy */
1728         swap(serial->tx_buffer, serial->tx_data);
1729         serial->tx_data_count = serial->tx_buffer_count;
1730         serial->tx_buffer_count = 0;
1731
1732         /* If serial->tx_data is set, it means we switched buffers */
1733         if (serial->tx_data && serial->write_data) {
1734                 res = serial->write_data(serial);
1735                 if (res >= 0)
1736                         serial->tx_urb_used = 1;
1737         }
1738 out:
1739         spin_unlock_irqrestore(&serial->serial_lock, flags);
1740 }
1741
1742 /* make a request (for reading and writing data to muxed serial port) */
1743 static int mux_device_request(struct hso_serial *serial, u8 type, u16 port,
1744                               struct urb *ctrl_urb,
1745                               struct usb_ctrlrequest *ctrl_req,
1746                               u8 *ctrl_urb_data, u32 size)
1747 {
1748         int result;
1749         int pipe;
1750
1751         /* Sanity check */
1752         if (!serial || !ctrl_urb || !ctrl_req) {
1753                 pr_err("%s: Wrong arguments\n", __func__);
1754                 return -EINVAL;
1755         }
1756
1757         /* initialize */
1758         ctrl_req->wValue = 0;
1759         ctrl_req->wIndex = cpu_to_le16(hso_port_to_mux(port));
1760         ctrl_req->wLength = cpu_to_le16(size);
1761
1762         if (type == USB_CDC_GET_ENCAPSULATED_RESPONSE) {
1763                 /* Reading command */
1764                 ctrl_req->bRequestType = USB_DIR_IN |
1765                                          USB_TYPE_OPTION_VENDOR |
1766                                          USB_RECIP_INTERFACE;
1767                 ctrl_req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
1768                 pipe = usb_rcvctrlpipe(serial->parent->usb, 0);
1769         } else {
1770                 /* Writing command */
1771                 ctrl_req->bRequestType = USB_DIR_OUT |
1772                                          USB_TYPE_OPTION_VENDOR |
1773                                          USB_RECIP_INTERFACE;
1774                 ctrl_req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND;
1775                 pipe = usb_sndctrlpipe(serial->parent->usb, 0);
1776         }
1777         /* syslog */
1778         hso_dbg(0x2, "%s command (%02x) len: %d, port: %d\n",
1779                 type == USB_CDC_GET_ENCAPSULATED_RESPONSE ? "Read" : "Write",
1780                 ctrl_req->bRequestType, ctrl_req->wLength, port);
1781
1782         /* Load ctrl urb */
1783         ctrl_urb->transfer_flags = 0;
1784         usb_fill_control_urb(ctrl_urb,
1785                              serial->parent->usb,
1786                              pipe,
1787                              (u8 *) ctrl_req,
1788                              ctrl_urb_data, size, ctrl_callback, serial);
1789         /* Send it on merry way */
1790         result = usb_submit_urb(ctrl_urb, GFP_ATOMIC);
1791         if (result) {
1792                 dev_err(&ctrl_urb->dev->dev,
1793                         "%s failed submit ctrl_urb %d type %d\n", __func__,
1794                         result, type);
1795                 return result;
1796         }
1797
1798         /* done */
1799         return size;
1800 }
1801
1802 /* called by intr_callback when read occurs */
1803 static int hso_mux_serial_read(struct hso_serial *serial)
1804 {
1805         if (!serial)
1806                 return -EINVAL;
1807
1808         /* clean data */
1809         memset(serial->rx_data[0], 0, CTRL_URB_RX_SIZE);
1810         /* make the request */
1811
1812         if (serial->num_rx_urbs != 1) {
1813                 dev_err(&serial->parent->interface->dev,
1814                         "ERROR: mux'd reads with multiple buffers "
1815                         "not possible\n");
1816                 return 0;
1817         }
1818         return mux_device_request(serial,
1819                                   USB_CDC_GET_ENCAPSULATED_RESPONSE,
1820                                   serial->parent->port_spec & HSO_PORT_MASK,
1821                                   serial->rx_urb[0],
1822                                   &serial->ctrl_req_rx,
1823                                   serial->rx_data[0], serial->rx_data_length);
1824 }
1825
1826 /* used for muxed serial port callback (muxed serial read) */
1827 static void intr_callback(struct urb *urb)
1828 {
1829         struct hso_shared_int *shared_int = urb->context;
1830         struct hso_serial *serial;
1831         unsigned char *port_req;
1832         int status = urb->status;
1833         unsigned long flags;
1834         int i;
1835
1836         usb_mark_last_busy(urb->dev);
1837
1838         /* sanity check */
1839         if (!shared_int)
1840                 return;
1841
1842         /* status check */
1843         if (status) {
1844                 handle_usb_error(status, __func__, NULL);
1845                 return;
1846         }
1847         hso_dbg(0x8, "--- Got intr callback 0x%02X ---\n", status);
1848
1849         /* what request? */
1850         port_req = urb->transfer_buffer;
1851         hso_dbg(0x8, "port_req = 0x%.2X\n", *port_req);
1852         /* loop over all muxed ports to find the one sending this */
1853         for (i = 0; i < 8; i++) {
1854                 /* max 8 channels on MUX */
1855                 if (*port_req & (1 << i)) {
1856                         serial = get_serial_by_shared_int_and_type(shared_int,
1857                                                                    (1 << i));
1858                         if (serial != NULL) {
1859                                 hso_dbg(0x1, "Pending read interrupt on port %d\n",
1860                                         i);
1861                                 spin_lock_irqsave(&serial->serial_lock, flags);
1862                                 if (serial->rx_state == RX_IDLE &&
1863                                         serial->port.count > 0) {
1864                                         /* Setup and send a ctrl req read on
1865                                          * port i */
1866                                         if (!serial->rx_urb_filled[0]) {
1867                                                 serial->rx_state = RX_SENT;
1868                                                 hso_mux_serial_read(serial);
1869                                         } else
1870                                                 serial->rx_state = RX_PENDING;
1871                                 } else {
1872                                         hso_dbg(0x1, "Already a read pending on port %d or port not open\n",
1873                                                 i);
1874                                 }
1875                                 spin_unlock_irqrestore(&serial->serial_lock,
1876                                                        flags);
1877                         }
1878                 }
1879         }
1880         /* Resubmit interrupt urb */
1881         hso_mux_submit_intr_urb(shared_int, urb->dev, GFP_ATOMIC);
1882 }
1883
1884 /* called for writing to muxed serial port */
1885 static int hso_mux_serial_write_data(struct hso_serial *serial)
1886 {
1887         if (NULL == serial)
1888                 return -EINVAL;
1889
1890         return mux_device_request(serial,
1891                                   USB_CDC_SEND_ENCAPSULATED_COMMAND,
1892                                   serial->parent->port_spec & HSO_PORT_MASK,
1893                                   serial->tx_urb,
1894                                   &serial->ctrl_req_tx,
1895                                   serial->tx_data, serial->tx_data_count);
1896 }
1897
1898 /* write callback for Diag and CS port */
1899 static void hso_std_serial_write_bulk_callback(struct urb *urb)
1900 {
1901         struct hso_serial *serial = urb->context;
1902         int status = urb->status;
1903         unsigned long flags;
1904
1905         /* sanity check */
1906         if (!serial) {
1907                 hso_dbg(0x1, "serial == NULL\n");
1908                 return;
1909         }
1910
1911         spin_lock_irqsave(&serial->serial_lock, flags);
1912         serial->tx_urb_used = 0;
1913         spin_unlock_irqrestore(&serial->serial_lock, flags);
1914         if (status) {
1915                 handle_usb_error(status, __func__, serial->parent);
1916                 return;
1917         }
1918         hso_put_activity(serial->parent);
1919         tty_port_tty_wakeup(&serial->port);
1920         hso_kick_transmit(serial);
1921
1922         hso_dbg(0x1, "\n");
1923 }
1924
1925 /* called for writing diag or CS serial port */
1926 static int hso_std_serial_write_data(struct hso_serial *serial)
1927 {
1928         int count = serial->tx_data_count;
1929         int result;
1930
1931         usb_fill_bulk_urb(serial->tx_urb,
1932                           serial->parent->usb,
1933                           usb_sndbulkpipe(serial->parent->usb,
1934                                           serial->out_endp->
1935                                           bEndpointAddress & 0x7F),
1936                           serial->tx_data, serial->tx_data_count,
1937                           hso_std_serial_write_bulk_callback, serial);
1938
1939         result = usb_submit_urb(serial->tx_urb, GFP_ATOMIC);
1940         if (result) {
1941                 dev_warn(&serial->parent->usb->dev,
1942                          "Failed to submit urb - res %d\n", result);
1943                 return result;
1944         }
1945
1946         return count;
1947 }
1948
1949 /* callback after read or write on muxed serial port */
1950 static void ctrl_callback(struct urb *urb)
1951 {
1952         struct hso_serial *serial = urb->context;
1953         struct usb_ctrlrequest *req;
1954         int status = urb->status;
1955         unsigned long flags;
1956
1957         /* sanity check */
1958         if (!serial)
1959                 return;
1960
1961         spin_lock_irqsave(&serial->serial_lock, flags);
1962         serial->tx_urb_used = 0;
1963         spin_unlock_irqrestore(&serial->serial_lock, flags);
1964         if (status) {
1965                 handle_usb_error(status, __func__, serial->parent);
1966                 return;
1967         }
1968
1969         /* what request? */
1970         req = (struct usb_ctrlrequest *)(urb->setup_packet);
1971         hso_dbg(0x8, "--- Got muxed ctrl callback 0x%02X ---\n", status);
1972         hso_dbg(0x8, "Actual length of urb = %d\n", urb->actual_length);
1973         DUMP1(urb->transfer_buffer, urb->actual_length);
1974
1975         if (req->bRequestType ==
1976             (USB_DIR_IN | USB_TYPE_OPTION_VENDOR | USB_RECIP_INTERFACE)) {
1977                 /* response to a read command */
1978                 serial->rx_urb_filled[0] = 1;
1979                 spin_lock_irqsave(&serial->serial_lock, flags);
1980                 put_rxbuf_data_and_resubmit_ctrl_urb(serial);
1981                 spin_unlock_irqrestore(&serial->serial_lock, flags);
1982         } else {
1983                 hso_put_activity(serial->parent);
1984                 tty_port_tty_wakeup(&serial->port);
1985                 /* response to a write command */
1986                 hso_kick_transmit(serial);
1987         }
1988 }
1989
1990 /* handle RX data for serial port */
1991 static int put_rxbuf_data(struct urb *urb, struct hso_serial *serial)
1992 {
1993         struct tty_struct *tty;
1994         int count;
1995
1996         /* Sanity check */
1997         if (urb == NULL || serial == NULL) {
1998                 hso_dbg(0x1, "serial = NULL\n");
1999                 return -2;
2000         }
2001
2002         tty = tty_port_tty_get(&serial->port);
2003
2004         if (tty && tty_throttled(tty)) {
2005                 tty_kref_put(tty);
2006                 return -1;
2007         }
2008
2009         /* Push data to tty */
2010         hso_dbg(0x1, "data to push to tty\n");
2011         count = tty_buffer_request_room(&serial->port, urb->actual_length);
2012         if (count >= urb->actual_length) {
2013                 tty_insert_flip_string(&serial->port, urb->transfer_buffer,
2014                                        urb->actual_length);
2015                 tty_flip_buffer_push(&serial->port);
2016         } else {
2017                 dev_warn(&serial->parent->usb->dev,
2018                          "dropping data, %d bytes lost\n", urb->actual_length);
2019         }
2020
2021         tty_kref_put(tty);
2022
2023         serial->rx_urb_filled[hso_urb_to_index(serial, urb)] = 0;
2024
2025         return 0;
2026 }
2027
2028
2029 /* Base driver functions */
2030
2031 static void hso_log_port(struct hso_device *hso_dev)
2032 {
2033         char *port_type;
2034         char port_dev[20];
2035
2036         switch (hso_dev->port_spec & HSO_PORT_MASK) {
2037         case HSO_PORT_CONTROL:
2038                 port_type = "Control";
2039                 break;
2040         case HSO_PORT_APP:
2041                 port_type = "Application";
2042                 break;
2043         case HSO_PORT_GPS:
2044                 port_type = "GPS";
2045                 break;
2046         case HSO_PORT_GPS_CONTROL:
2047                 port_type = "GPS control";
2048                 break;
2049         case HSO_PORT_APP2:
2050                 port_type = "Application2";
2051                 break;
2052         case HSO_PORT_PCSC:
2053                 port_type = "PCSC";
2054                 break;
2055         case HSO_PORT_DIAG:
2056                 port_type = "Diagnostic";
2057                 break;
2058         case HSO_PORT_DIAG2:
2059                 port_type = "Diagnostic2";
2060                 break;
2061         case HSO_PORT_MODEM:
2062                 port_type = "Modem";
2063                 break;
2064         case HSO_PORT_NETWORK:
2065                 port_type = "Network";
2066                 break;
2067         default:
2068                 port_type = "Unknown";
2069                 break;
2070         }
2071         if ((hso_dev->port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2072                 sprintf(port_dev, "%s", dev2net(hso_dev)->net->name);
2073         } else
2074                 sprintf(port_dev, "/dev/%s%d", tty_filename,
2075                         dev2ser(hso_dev)->minor);
2076
2077         dev_dbg(&hso_dev->interface->dev, "HSO: Found %s port %s\n",
2078                 port_type, port_dev);
2079 }
2080
2081 static int hso_start_net_device(struct hso_device *hso_dev)
2082 {
2083         int i, result = 0;
2084         struct hso_net *hso_net = dev2net(hso_dev);
2085
2086         if (!hso_net)
2087                 return -ENODEV;
2088
2089         /* send URBs for all read buffers */
2090         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2091
2092                 /* Prep a receive URB */
2093                 usb_fill_bulk_urb(hso_net->mux_bulk_rx_urb_pool[i],
2094                                   hso_dev->usb,
2095                                   usb_rcvbulkpipe(hso_dev->usb,
2096                                                   hso_net->in_endp->
2097                                                   bEndpointAddress & 0x7F),
2098                                   hso_net->mux_bulk_rx_buf_pool[i],
2099                                   MUX_BULK_RX_BUF_SIZE, read_bulk_callback,
2100                                   hso_net);
2101
2102                 /* Put it out there so the device can send us stuff */
2103                 result = usb_submit_urb(hso_net->mux_bulk_rx_urb_pool[i],
2104                                         GFP_NOIO);
2105                 if (result)
2106                         dev_warn(&hso_dev->usb->dev,
2107                                 "%s failed mux_bulk_rx_urb[%d] %d\n", __func__,
2108                                 i, result);
2109         }
2110
2111         return result;
2112 }
2113
2114 static int hso_stop_net_device(struct hso_device *hso_dev)
2115 {
2116         int i;
2117         struct hso_net *hso_net = dev2net(hso_dev);
2118
2119         if (!hso_net)
2120                 return -ENODEV;
2121
2122         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2123                 if (hso_net->mux_bulk_rx_urb_pool[i])
2124                         usb_kill_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2125
2126         }
2127         if (hso_net->mux_bulk_tx_urb)
2128                 usb_kill_urb(hso_net->mux_bulk_tx_urb);
2129
2130         return 0;
2131 }
2132
2133 static int hso_start_serial_device(struct hso_device *hso_dev, gfp_t flags)
2134 {
2135         int i, result = 0;
2136         struct hso_serial *serial = dev2ser(hso_dev);
2137
2138         if (!serial)
2139                 return -ENODEV;
2140
2141         /* If it is not the MUX port fill in and submit a bulk urb (already
2142          * allocated in hso_serial_start) */
2143         if (!(serial->parent->port_spec & HSO_INTF_MUX)) {
2144                 for (i = 0; i < serial->num_rx_urbs; i++) {
2145                         usb_fill_bulk_urb(serial->rx_urb[i],
2146                                           serial->parent->usb,
2147                                           usb_rcvbulkpipe(serial->parent->usb,
2148                                                           serial->in_endp->
2149                                                           bEndpointAddress &
2150                                                           0x7F),
2151                                           serial->rx_data[i],
2152                                           serial->rx_data_length,
2153                                           hso_std_serial_read_bulk_callback,
2154                                           serial);
2155                         result = usb_submit_urb(serial->rx_urb[i], flags);
2156                         if (result) {
2157                                 dev_warn(&serial->parent->usb->dev,
2158                                          "Failed to submit urb - res %d\n",
2159                                          result);
2160                                 break;
2161                         }
2162                 }
2163         } else {
2164                 mutex_lock(&serial->shared_int->shared_int_lock);
2165                 if (!serial->shared_int->use_count) {
2166                         result =
2167                             hso_mux_submit_intr_urb(serial->shared_int,
2168                                                     hso_dev->usb, flags);
2169                 }
2170                 serial->shared_int->use_count++;
2171                 mutex_unlock(&serial->shared_int->shared_int_lock);
2172         }
2173         if (serial->tiocmget)
2174                 tiocmget_submit_urb(serial,
2175                                     serial->tiocmget,
2176                                     serial->parent->usb);
2177         return result;
2178 }
2179
2180 static int hso_stop_serial_device(struct hso_device *hso_dev)
2181 {
2182         int i;
2183         struct hso_serial *serial = dev2ser(hso_dev);
2184         struct hso_tiocmget  *tiocmget;
2185
2186         if (!serial)
2187                 return -ENODEV;
2188
2189         for (i = 0; i < serial->num_rx_urbs; i++) {
2190                 if (serial->rx_urb[i]) {
2191                         usb_kill_urb(serial->rx_urb[i]);
2192                         serial->rx_urb_filled[i] = 0;
2193                 }
2194         }
2195         serial->curr_rx_urb_idx = 0;
2196
2197         if (serial->tx_urb)
2198                 usb_kill_urb(serial->tx_urb);
2199
2200         if (serial->shared_int) {
2201                 mutex_lock(&serial->shared_int->shared_int_lock);
2202                 if (serial->shared_int->use_count &&
2203                     (--serial->shared_int->use_count == 0)) {
2204                         struct urb *urb;
2205
2206                         urb = serial->shared_int->shared_intr_urb;
2207                         if (urb)
2208                                 usb_kill_urb(urb);
2209                 }
2210                 mutex_unlock(&serial->shared_int->shared_int_lock);
2211         }
2212         tiocmget = serial->tiocmget;
2213         if (tiocmget) {
2214                 wake_up_interruptible(&tiocmget->waitq);
2215                 usb_kill_urb(tiocmget->urb);
2216         }
2217
2218         return 0;
2219 }
2220
2221 static void hso_serial_tty_unregister(struct hso_serial *serial)
2222 {
2223         tty_unregister_device(tty_drv, serial->minor);
2224         release_minor(serial);
2225 }
2226
2227 static void hso_serial_common_free(struct hso_serial *serial)
2228 {
2229         int i;
2230
2231         for (i = 0; i < serial->num_rx_urbs; i++) {
2232                 /* unlink and free RX URB */
2233                 usb_free_urb(serial->rx_urb[i]);
2234                 /* free the RX buffer */
2235                 kfree(serial->rx_data[i]);
2236         }
2237
2238         /* unlink and free TX URB */
2239         usb_free_urb(serial->tx_urb);
2240         kfree(serial->tx_buffer);
2241         kfree(serial->tx_data);
2242         tty_port_destroy(&serial->port);
2243 }
2244
2245 static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
2246                                     int rx_size, int tx_size)
2247 {
2248         int i;
2249
2250         tty_port_init(&serial->port);
2251
2252         if (obtain_minor(serial))
2253                 goto exit2;
2254
2255         /* register our minor number */
2256         serial->parent->dev = tty_port_register_device_attr(&serial->port,
2257                         tty_drv, serial->minor, &serial->parent->interface->dev,
2258                         serial->parent, hso_serial_dev_groups);
2259         if (IS_ERR(serial->parent->dev)) {
2260                 release_minor(serial);
2261                 goto exit2;
2262         }
2263
2264         serial->magic = HSO_SERIAL_MAGIC;
2265         spin_lock_init(&serial->serial_lock);
2266         serial->num_rx_urbs = num_urbs;
2267
2268         /* RX, allocate urb and initialize */
2269
2270         /* prepare our RX buffer */
2271         serial->rx_data_length = rx_size;
2272         for (i = 0; i < serial->num_rx_urbs; i++) {
2273                 serial->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL);
2274                 if (!serial->rx_urb[i])
2275                         goto exit;
2276                 serial->rx_urb[i]->transfer_buffer = NULL;
2277                 serial->rx_urb[i]->transfer_buffer_length = 0;
2278                 serial->rx_data[i] = kzalloc(serial->rx_data_length,
2279                                              GFP_KERNEL);
2280                 if (!serial->rx_data[i])
2281                         goto exit;
2282         }
2283
2284         /* TX, allocate urb and initialize */
2285         serial->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2286         if (!serial->tx_urb)
2287                 goto exit;
2288         serial->tx_urb->transfer_buffer = NULL;
2289         serial->tx_urb->transfer_buffer_length = 0;
2290         /* prepare our TX buffer */
2291         serial->tx_data_count = 0;
2292         serial->tx_buffer_count = 0;
2293         serial->tx_data_length = tx_size;
2294         serial->tx_data = kzalloc(serial->tx_data_length, GFP_KERNEL);
2295         if (!serial->tx_data)
2296                 goto exit;
2297
2298         serial->tx_buffer = kzalloc(serial->tx_data_length, GFP_KERNEL);
2299         if (!serial->tx_buffer)
2300                 goto exit;
2301
2302         return 0;
2303 exit:
2304         hso_serial_tty_unregister(serial);
2305 exit2:
2306         hso_serial_common_free(serial);
2307         return -1;
2308 }
2309
2310 /* Creates a general hso device */
2311 static struct hso_device *hso_create_device(struct usb_interface *intf,
2312                                             int port_spec)
2313 {
2314         struct hso_device *hso_dev;
2315
2316         hso_dev = kzalloc(sizeof(*hso_dev), GFP_KERNEL);
2317         if (!hso_dev)
2318                 return NULL;
2319
2320         hso_dev->port_spec = port_spec;
2321         hso_dev->usb = interface_to_usbdev(intf);
2322         hso_dev->interface = intf;
2323         kref_init(&hso_dev->ref);
2324         mutex_init(&hso_dev->mutex);
2325
2326         INIT_WORK(&hso_dev->async_get_intf, async_get_intf);
2327         INIT_WORK(&hso_dev->async_put_intf, async_put_intf);
2328
2329         return hso_dev;
2330 }
2331
2332 /* Removes a network device in the network device table */
2333 static int remove_net_device(struct hso_device *hso_dev)
2334 {
2335         int i;
2336
2337         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2338                 if (network_table[i] == hso_dev) {
2339                         network_table[i] = NULL;
2340                         break;
2341                 }
2342         }
2343         if (i == HSO_MAX_NET_DEVICES)
2344                 return -1;
2345         return 0;
2346 }
2347
2348 /* Frees our network device */
2349 static void hso_free_net_device(struct hso_device *hso_dev)
2350 {
2351         int i;
2352         struct hso_net *hso_net = dev2net(hso_dev);
2353
2354         if (!hso_net)
2355                 return;
2356
2357         remove_net_device(hso_net->parent);
2358
2359         if (hso_net->net)
2360                 unregister_netdev(hso_net->net);
2361
2362         /* start freeing */
2363         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2364                 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2365                 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2366                 hso_net->mux_bulk_rx_buf_pool[i] = NULL;
2367         }
2368         usb_free_urb(hso_net->mux_bulk_tx_urb);
2369         kfree(hso_net->mux_bulk_tx_buf);
2370         hso_net->mux_bulk_tx_buf = NULL;
2371
2372         if (hso_net->net)
2373                 free_netdev(hso_net->net);
2374
2375         kfree(hso_dev);
2376 }
2377
2378 static const struct net_device_ops hso_netdev_ops = {
2379         .ndo_open       = hso_net_open,
2380         .ndo_stop       = hso_net_close,
2381         .ndo_start_xmit = hso_net_start_xmit,
2382         .ndo_tx_timeout = hso_net_tx_timeout,
2383 };
2384
2385 /* initialize the network interface */
2386 static void hso_net_init(struct net_device *net)
2387 {
2388         struct hso_net *hso_net = netdev_priv(net);
2389
2390         hso_dbg(0x1, "sizeof hso_net is %zu\n", sizeof(*hso_net));
2391
2392         /* fill in the other fields */
2393         net->netdev_ops = &hso_netdev_ops;
2394         net->watchdog_timeo = HSO_NET_TX_TIMEOUT;
2395         net->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
2396         net->type = ARPHRD_NONE;
2397         net->mtu = DEFAULT_MTU - 14;
2398         net->tx_queue_len = 10;
2399         net->ethtool_ops = &ops;
2400
2401         /* and initialize the semaphore */
2402         spin_lock_init(&hso_net->net_lock);
2403 }
2404
2405 /* Adds a network device in the network device table */
2406 static int add_net_device(struct hso_device *hso_dev)
2407 {
2408         int i;
2409
2410         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
2411                 if (network_table[i] == NULL) {
2412                         network_table[i] = hso_dev;
2413                         break;
2414                 }
2415         }
2416         if (i == HSO_MAX_NET_DEVICES)
2417                 return -1;
2418         return 0;
2419 }
2420
2421 static int hso_rfkill_set_block(void *data, bool blocked)
2422 {
2423         struct hso_device *hso_dev = data;
2424         int enabled = !blocked;
2425         int rv;
2426
2427         mutex_lock(&hso_dev->mutex);
2428         if (hso_dev->usb_gone)
2429                 rv = 0;
2430         else
2431                 rv = usb_control_msg(hso_dev->usb, usb_sndctrlpipe(hso_dev->usb, 0),
2432                                        enabled ? 0x82 : 0x81, 0x40, 0, 0, NULL, 0,
2433                                        USB_CTRL_SET_TIMEOUT);
2434         mutex_unlock(&hso_dev->mutex);
2435         return rv;
2436 }
2437
2438 static const struct rfkill_ops hso_rfkill_ops = {
2439         .set_block = hso_rfkill_set_block,
2440 };
2441
2442 /* Creates and sets up everything for rfkill */
2443 static void hso_create_rfkill(struct hso_device *hso_dev,
2444                              struct usb_interface *interface)
2445 {
2446         struct hso_net *hso_net = dev2net(hso_dev);
2447         struct device *dev = &hso_net->net->dev;
2448         static u32 rfkill_counter;
2449
2450         snprintf(hso_net->name, sizeof(hso_net->name), "hso-%d",
2451                  rfkill_counter++);
2452
2453         hso_net->rfkill = rfkill_alloc(hso_net->name,
2454                                        &interface_to_usbdev(interface)->dev,
2455                                        RFKILL_TYPE_WWAN,
2456                                        &hso_rfkill_ops, hso_dev);
2457         if (!hso_net->rfkill)
2458                 return;
2459
2460         if (rfkill_register(hso_net->rfkill) < 0) {
2461                 rfkill_destroy(hso_net->rfkill);
2462                 hso_net->rfkill = NULL;
2463                 dev_err(dev, "%s - Failed to register rfkill\n", __func__);
2464                 return;
2465         }
2466 }
2467
2468 static struct device_type hso_type = {
2469         .name   = "wwan",
2470 };
2471
2472 /* Creates our network device */
2473 static struct hso_device *hso_create_net_device(struct usb_interface *interface,
2474                                                 int port_spec)
2475 {
2476         int result, i;
2477         struct net_device *net;
2478         struct hso_net *hso_net;
2479         struct hso_device *hso_dev;
2480
2481         hso_dev = hso_create_device(interface, port_spec);
2482         if (!hso_dev)
2483                 return NULL;
2484
2485         /* allocate our network device, then we can put in our private data */
2486         /* call hso_net_init to do the basic initialization */
2487         net = alloc_netdev(sizeof(struct hso_net), "hso%d", NET_NAME_UNKNOWN,
2488                            hso_net_init);
2489         if (!net) {
2490                 dev_err(&interface->dev, "Unable to create ethernet device\n");
2491                 goto err_hso_dev;
2492         }
2493
2494         hso_net = netdev_priv(net);
2495
2496         hso_dev->port_data.dev_net = hso_net;
2497         hso_net->net = net;
2498         hso_net->parent = hso_dev;
2499
2500         hso_net->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2501                                       USB_DIR_IN);
2502         if (!hso_net->in_endp) {
2503                 dev_err(&interface->dev, "Can't find BULK IN endpoint\n");
2504                 goto err_net;
2505         }
2506         hso_net->out_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2507                                        USB_DIR_OUT);
2508         if (!hso_net->out_endp) {
2509                 dev_err(&interface->dev, "Can't find BULK OUT endpoint\n");
2510                 goto err_net;
2511         }
2512         SET_NETDEV_DEV(net, &interface->dev);
2513         SET_NETDEV_DEVTYPE(net, &hso_type);
2514
2515         /* start allocating */
2516         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2517                 hso_net->mux_bulk_rx_urb_pool[i] = usb_alloc_urb(0, GFP_KERNEL);
2518                 if (!hso_net->mux_bulk_rx_urb_pool[i])
2519                         goto err_mux_bulk_rx;
2520                 hso_net->mux_bulk_rx_buf_pool[i] = kzalloc(MUX_BULK_RX_BUF_SIZE,
2521                                                            GFP_KERNEL);
2522                 if (!hso_net->mux_bulk_rx_buf_pool[i])
2523                         goto err_mux_bulk_rx;
2524         }
2525         hso_net->mux_bulk_tx_urb = usb_alloc_urb(0, GFP_KERNEL);
2526         if (!hso_net->mux_bulk_tx_urb)
2527                 goto err_mux_bulk_rx;
2528         hso_net->mux_bulk_tx_buf = kzalloc(MUX_BULK_TX_BUF_SIZE, GFP_KERNEL);
2529         if (!hso_net->mux_bulk_tx_buf)
2530                 goto err_free_tx_urb;
2531
2532         result = add_net_device(hso_dev);
2533         if (result) {
2534                 dev_err(&interface->dev, "Failed to add net device\n");
2535                 goto err_free_tx_buf;
2536         }
2537
2538         /* registering our net device */
2539         result = register_netdev(net);
2540         if (result) {
2541                 dev_err(&interface->dev, "Failed to register device\n");
2542                 goto err_rmv_ndev;
2543         }
2544
2545         hso_log_port(hso_dev);
2546
2547         hso_create_rfkill(hso_dev, interface);
2548
2549         return hso_dev;
2550
2551 err_rmv_ndev:
2552         remove_net_device(hso_dev);
2553 err_free_tx_buf:
2554         kfree(hso_net->mux_bulk_tx_buf);
2555 err_free_tx_urb:
2556         usb_free_urb(hso_net->mux_bulk_tx_urb);
2557 err_mux_bulk_rx:
2558         for (i = 0; i < MUX_BULK_RX_BUF_COUNT; i++) {
2559                 usb_free_urb(hso_net->mux_bulk_rx_urb_pool[i]);
2560                 kfree(hso_net->mux_bulk_rx_buf_pool[i]);
2561         }
2562 err_net:
2563         free_netdev(net);
2564 err_hso_dev:
2565         kfree(hso_dev);
2566         return NULL;
2567 }
2568
2569 static void hso_free_tiomget(struct hso_serial *serial)
2570 {
2571         struct hso_tiocmget *tiocmget;
2572         if (!serial)
2573                 return;
2574         tiocmget = serial->tiocmget;
2575         if (tiocmget) {
2576                 usb_free_urb(tiocmget->urb);
2577                 tiocmget->urb = NULL;
2578                 serial->tiocmget = NULL;
2579                 kfree(tiocmget->serial_state_notification);
2580                 tiocmget->serial_state_notification = NULL;
2581                 kfree(tiocmget);
2582         }
2583 }
2584
2585 /* Frees an AT channel ( goes for both mux and non-mux ) */
2586 static void hso_free_serial_device(struct hso_device *hso_dev)
2587 {
2588         struct hso_serial *serial = dev2ser(hso_dev);
2589
2590         if (!serial)
2591                 return;
2592
2593         hso_serial_common_free(serial);
2594
2595         if (serial->shared_int) {
2596                 mutex_lock(&serial->shared_int->shared_int_lock);
2597                 if (--serial->shared_int->ref_count == 0)
2598                         hso_free_shared_int(serial->shared_int);
2599                 else
2600                         mutex_unlock(&serial->shared_int->shared_int_lock);
2601         }
2602         hso_free_tiomget(serial);
2603         kfree(serial);
2604         kfree(hso_dev);
2605 }
2606
2607 /* Creates a bulk AT channel */
2608 static struct hso_device *hso_create_bulk_serial_device(
2609                         struct usb_interface *interface, int port)
2610 {
2611         struct hso_device *hso_dev;
2612         struct hso_serial *serial;
2613         int num_urbs;
2614         struct hso_tiocmget *tiocmget;
2615
2616         hso_dev = hso_create_device(interface, port);
2617         if (!hso_dev)
2618                 return NULL;
2619
2620         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2621         if (!serial)
2622                 goto exit;
2623
2624         serial->parent = hso_dev;
2625         hso_dev->port_data.dev_serial = serial;
2626
2627         if ((port & HSO_PORT_MASK) == HSO_PORT_MODEM) {
2628                 num_urbs = 2;
2629                 serial->tiocmget = kzalloc(sizeof(struct hso_tiocmget),
2630                                            GFP_KERNEL);
2631                 if (!serial->tiocmget)
2632                         goto exit;
2633                 serial->tiocmget->serial_state_notification
2634                         = kzalloc(sizeof(struct hso_serial_state_notification),
2635                                            GFP_KERNEL);
2636                 if (!serial->tiocmget->serial_state_notification)
2637                         goto exit;
2638                 tiocmget = serial->tiocmget;
2639                 tiocmget->endp = hso_get_ep(interface,
2640                                             USB_ENDPOINT_XFER_INT,
2641                                             USB_DIR_IN);
2642                 if (!tiocmget->endp) {
2643                         dev_err(&interface->dev, "Failed to find INT IN ep\n");
2644                         goto exit;
2645                 }
2646
2647                 tiocmget->urb = usb_alloc_urb(0, GFP_KERNEL);
2648                 if (!tiocmget->urb)
2649                         goto exit;
2650
2651                 mutex_init(&tiocmget->mutex);
2652                 init_waitqueue_head(&tiocmget->waitq);
2653         } else {
2654                 num_urbs = 1;
2655         }
2656
2657         if (hso_serial_common_create(serial, num_urbs, BULK_URB_RX_SIZE,
2658                                      BULK_URB_TX_SIZE))
2659                 goto exit;
2660
2661         serial->in_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_BULK,
2662                                      USB_DIR_IN);
2663         if (!serial->in_endp) {
2664                 dev_err(&interface->dev, "Failed to find BULK IN ep\n");
2665                 goto exit2;
2666         }
2667
2668         if (!
2669             (serial->out_endp =
2670              hso_get_ep(interface, USB_ENDPOINT_XFER_BULK, USB_DIR_OUT))) {
2671                 dev_err(&interface->dev, "Failed to find BULK OUT ep\n");
2672                 goto exit2;
2673         }
2674
2675         serial->write_data = hso_std_serial_write_data;
2676
2677         /* setup the proc dirs and files if needed */
2678         hso_log_port(hso_dev);
2679
2680         /* done, return it */
2681         return hso_dev;
2682
2683 exit2:
2684         hso_serial_tty_unregister(serial);
2685         hso_serial_common_free(serial);
2686 exit:
2687         hso_free_tiomget(serial);
2688         kfree(serial);
2689         kfree(hso_dev);
2690         return NULL;
2691 }
2692
2693 /* Creates a multiplexed AT channel */
2694 static
2695 struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
2696                                                 int port,
2697                                                 struct hso_shared_int *mux)
2698 {
2699         struct hso_device *hso_dev;
2700         struct hso_serial *serial;
2701         int port_spec;
2702
2703         port_spec = HSO_INTF_MUX;
2704         port_spec &= ~HSO_PORT_MASK;
2705
2706         port_spec |= hso_mux_to_port(port);
2707         if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NO_PORT)
2708                 return NULL;
2709
2710         hso_dev = hso_create_device(interface, port_spec);
2711         if (!hso_dev)
2712                 return NULL;
2713
2714         serial = kzalloc(sizeof(*serial), GFP_KERNEL);
2715         if (!serial)
2716                 goto err_free_dev;
2717
2718         hso_dev->port_data.dev_serial = serial;
2719         serial->parent = hso_dev;
2720
2721         if (hso_serial_common_create
2722             (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE))
2723                 goto err_free_serial;
2724
2725         serial->tx_data_length--;
2726         serial->write_data = hso_mux_serial_write_data;
2727
2728         serial->shared_int = mux;
2729         mutex_lock(&serial->shared_int->shared_int_lock);
2730         serial->shared_int->ref_count++;
2731         mutex_unlock(&serial->shared_int->shared_int_lock);
2732
2733         /* setup the proc dirs and files if needed */
2734         hso_log_port(hso_dev);
2735
2736         /* done, return it */
2737         return hso_dev;
2738
2739 err_free_serial:
2740         kfree(serial);
2741 err_free_dev:
2742         kfree(hso_dev);
2743         return NULL;
2744
2745 }
2746
2747 static void hso_free_shared_int(struct hso_shared_int *mux)
2748 {
2749         usb_free_urb(mux->shared_intr_urb);
2750         kfree(mux->shared_intr_buf);
2751         mutex_unlock(&mux->shared_int_lock);
2752         kfree(mux);
2753 }
2754
2755 static
2756 struct hso_shared_int *hso_create_shared_int(struct usb_interface *interface)
2757 {
2758         struct hso_shared_int *mux = kzalloc(sizeof(*mux), GFP_KERNEL);
2759
2760         if (!mux)
2761                 return NULL;
2762
2763         mux->intr_endp = hso_get_ep(interface, USB_ENDPOINT_XFER_INT,
2764                                     USB_DIR_IN);
2765         if (!mux->intr_endp) {
2766                 dev_err(&interface->dev, "Can't find INT IN endpoint\n");
2767                 goto exit;
2768         }
2769
2770         mux->shared_intr_urb = usb_alloc_urb(0, GFP_KERNEL);
2771         if (!mux->shared_intr_urb)
2772                 goto exit;
2773         mux->shared_intr_buf =
2774                 kzalloc(le16_to_cpu(mux->intr_endp->wMaxPacketSize),
2775                         GFP_KERNEL);
2776         if (!mux->shared_intr_buf)
2777                 goto exit;
2778
2779         mutex_init(&mux->shared_int_lock);
2780
2781         return mux;
2782
2783 exit:
2784         kfree(mux->shared_intr_buf);
2785         usb_free_urb(mux->shared_intr_urb);
2786         kfree(mux);
2787         return NULL;
2788 }
2789
2790 /* Gets the port spec for a certain interface */
2791 static int hso_get_config_data(struct usb_interface *interface)
2792 {
2793         struct usb_device *usbdev = interface_to_usbdev(interface);
2794         u8 *config_data = kmalloc(17, GFP_KERNEL);
2795         u32 if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2796         s32 result;
2797
2798         if (!config_data)
2799                 return -ENOMEM;
2800         if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
2801                             0x86, 0xC0, 0, 0, config_data, 17,
2802                             USB_CTRL_SET_TIMEOUT) != 0x11) {
2803                 kfree(config_data);
2804                 return -EIO;
2805         }
2806
2807         /* check if we have a valid interface */
2808         if (if_num > 16) {
2809                 kfree(config_data);
2810                 return -EINVAL;
2811         }
2812
2813         switch (config_data[if_num]) {
2814         case 0x0:
2815                 result = 0;
2816                 break;
2817         case 0x1:
2818                 result = HSO_PORT_DIAG;
2819                 break;
2820         case 0x2:
2821                 result = HSO_PORT_GPS;
2822                 break;
2823         case 0x3:
2824                 result = HSO_PORT_GPS_CONTROL;
2825                 break;
2826         case 0x4:
2827                 result = HSO_PORT_APP;
2828                 break;
2829         case 0x5:
2830                 result = HSO_PORT_APP2;
2831                 break;
2832         case 0x6:
2833                 result = HSO_PORT_CONTROL;
2834                 break;
2835         case 0x7:
2836                 result = HSO_PORT_NETWORK;
2837                 break;
2838         case 0x8:
2839                 result = HSO_PORT_MODEM;
2840                 break;
2841         case 0x9:
2842                 result = HSO_PORT_MSD;
2843                 break;
2844         case 0xa:
2845                 result = HSO_PORT_PCSC;
2846                 break;
2847         case 0xb:
2848                 result = HSO_PORT_VOICE;
2849                 break;
2850         default:
2851                 result = 0;
2852         }
2853
2854         if (result)
2855                 result |= HSO_INTF_BULK;
2856
2857         if (config_data[16] & 0x1)
2858                 result |= HSO_INFO_CRC_BUG;
2859
2860         kfree(config_data);
2861         return result;
2862 }
2863
2864 /* called once for each interface upon device insertion */
2865 static int hso_probe(struct usb_interface *interface,
2866                      const struct usb_device_id *id)
2867 {
2868         int mux, i, if_num, port_spec;
2869         unsigned char port_mask;
2870         struct hso_device *hso_dev = NULL;
2871         struct hso_shared_int *shared_int;
2872         struct hso_device *tmp_dev = NULL;
2873
2874         if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
2875                 dev_err(&interface->dev, "Not our interface\n");
2876                 return -ENODEV;
2877         }
2878
2879         if_num = interface->cur_altsetting->desc.bInterfaceNumber;
2880
2881         /* Get the interface/port specification from either driver_info or from
2882          * the device itself */
2883         if (id->driver_info) {
2884                 /* if_num is controlled by the device, driver_info is a 0 terminated
2885                  * array. Make sure, the access is in bounds! */
2886                 for (i = 0; i <= if_num; ++i)
2887                         if (((u32 *)(id->driver_info))[i] == 0)
2888                                 goto exit;
2889                 port_spec = ((u32 *)(id->driver_info))[if_num];
2890         } else {
2891                 port_spec = hso_get_config_data(interface);
2892                 if (port_spec < 0)
2893                         goto exit;
2894         }
2895
2896         /* Check if we need to switch to alt interfaces prior to port
2897          * configuration */
2898         if (interface->num_altsetting > 1)
2899                 usb_set_interface(interface_to_usbdev(interface), if_num, 1);
2900         interface->needs_remote_wakeup = 1;
2901
2902         /* Allocate new hso device(s) */
2903         switch (port_spec & HSO_INTF_MASK) {
2904         case HSO_INTF_MUX:
2905                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2906                         /* Create the network device */
2907                         if (!disable_net) {
2908                                 hso_dev = hso_create_net_device(interface,
2909                                                                 port_spec);
2910                                 if (!hso_dev)
2911                                         goto exit;
2912                                 tmp_dev = hso_dev;
2913                         }
2914                 }
2915
2916                 if (hso_get_mux_ports(interface, &port_mask))
2917                         /* TODO: de-allocate everything */
2918                         goto exit;
2919
2920                 shared_int = hso_create_shared_int(interface);
2921                 if (!shared_int)
2922                         goto exit;
2923
2924                 for (i = 1, mux = 0; i < 0x100; i = i << 1, mux++) {
2925                         if (port_mask & i) {
2926                                 hso_dev = hso_create_mux_serial_device(
2927                                                 interface, i, shared_int);
2928                                 if (!hso_dev)
2929                                         goto exit;
2930                         }
2931                 }
2932
2933                 if (tmp_dev)
2934                         hso_dev = tmp_dev;
2935                 break;
2936
2937         case HSO_INTF_BULK:
2938                 /* It's a regular bulk interface */
2939                 if ((port_spec & HSO_PORT_MASK) == HSO_PORT_NETWORK) {
2940                         if (!disable_net)
2941                                 hso_dev =
2942                                     hso_create_net_device(interface, port_spec);
2943                 } else {
2944                         hso_dev =
2945                             hso_create_bulk_serial_device(interface, port_spec);
2946                 }
2947                 if (!hso_dev)
2948                         goto exit;
2949                 break;
2950         default:
2951                 goto exit;
2952         }
2953
2954         /* save our data pointer in this device */
2955         usb_set_intfdata(interface, hso_dev);
2956
2957         /* done */
2958         return 0;
2959 exit:
2960         hso_free_interface(interface);
2961         return -ENODEV;
2962 }
2963
2964 /* device removed, cleaning up */
2965 static void hso_disconnect(struct usb_interface *interface)
2966 {
2967         hso_free_interface(interface);
2968
2969         /* remove reference of our private data */
2970         usb_set_intfdata(interface, NULL);
2971 }
2972
2973 static void async_get_intf(struct work_struct *data)
2974 {
2975         struct hso_device *hso_dev =
2976             container_of(data, struct hso_device, async_get_intf);
2977         usb_autopm_get_interface(hso_dev->interface);
2978 }
2979
2980 static void async_put_intf(struct work_struct *data)
2981 {
2982         struct hso_device *hso_dev =
2983             container_of(data, struct hso_device, async_put_intf);
2984         usb_autopm_put_interface(hso_dev->interface);
2985 }
2986
2987 static int hso_get_activity(struct hso_device *hso_dev)
2988 {
2989         if (hso_dev->usb->state == USB_STATE_SUSPENDED) {
2990                 if (!hso_dev->is_active) {
2991                         hso_dev->is_active = 1;
2992                         schedule_work(&hso_dev->async_get_intf);
2993                 }
2994         }
2995
2996         if (hso_dev->usb->state != USB_STATE_CONFIGURED)
2997                 return -EAGAIN;
2998
2999         usb_mark_last_busy(hso_dev->usb);
3000
3001         return 0;
3002 }
3003
3004 static int hso_put_activity(struct hso_device *hso_dev)
3005 {
3006         if (hso_dev->usb->state != USB_STATE_SUSPENDED) {
3007                 if (hso_dev->is_active) {
3008                         hso_dev->is_active = 0;
3009                         schedule_work(&hso_dev->async_put_intf);
3010                         return -EAGAIN;
3011                 }
3012         }
3013         hso_dev->is_active = 0;
3014         return 0;
3015 }
3016
3017 /* called by kernel when we need to suspend device */
3018 static int hso_suspend(struct usb_interface *iface, pm_message_t message)
3019 {
3020         int i, result;
3021
3022         /* Stop all serial ports */
3023         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3024                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3025                         result = hso_stop_serial_device(serial_table[i]);
3026                         if (result)
3027                                 goto out;
3028                 }
3029         }
3030
3031         /* Stop all network ports */
3032         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3033                 if (network_table[i] &&
3034                     (network_table[i]->interface == iface)) {
3035                         result = hso_stop_net_device(network_table[i]);
3036                         if (result)
3037                                 goto out;
3038                 }
3039         }
3040
3041 out:
3042         return 0;
3043 }
3044
3045 /* called by kernel when we need to resume device */
3046 static int hso_resume(struct usb_interface *iface)
3047 {
3048         int i, result = 0;
3049         struct hso_net *hso_net;
3050
3051         /* Start all serial ports */
3052         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3053                 if (serial_table[i] && (serial_table[i]->interface == iface)) {
3054                         if (dev2ser(serial_table[i])->port.count) {
3055                                 result =
3056                                     hso_start_serial_device(serial_table[i], GFP_NOIO);
3057                                 hso_kick_transmit(dev2ser(serial_table[i]));
3058                                 if (result)
3059                                         goto out;
3060                         }
3061                 }
3062         }
3063
3064         /* Start all network ports */
3065         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3066                 if (network_table[i] &&
3067                     (network_table[i]->interface == iface)) {
3068                         hso_net = dev2net(network_table[i]);
3069                         if (hso_net->flags & IFF_UP) {
3070                                 /* First transmit any lingering data,
3071                                    then restart the device. */
3072                                 if (hso_net->skb_tx_buf) {
3073                                         dev_dbg(&iface->dev,
3074                                                 "Transmitting"
3075                                                 " lingering data\n");
3076                                         hso_net_start_xmit(hso_net->skb_tx_buf,
3077                                                            hso_net->net);
3078                                         hso_net->skb_tx_buf = NULL;
3079                                 }
3080                                 result = hso_start_net_device(network_table[i]);
3081                                 if (result)
3082                                         goto out;
3083                         }
3084                 }
3085         }
3086
3087 out:
3088         return result;
3089 }
3090
3091 static void hso_serial_ref_free(struct kref *ref)
3092 {
3093         struct hso_device *hso_dev = container_of(ref, struct hso_device, ref);
3094
3095         hso_free_serial_device(hso_dev);
3096 }
3097
3098 static void hso_free_interface(struct usb_interface *interface)
3099 {
3100         struct hso_serial *serial;
3101         int i;
3102
3103         for (i = 0; i < HSO_SERIAL_TTY_MINORS; i++) {
3104                 if (serial_table[i] &&
3105                     (serial_table[i]->interface == interface)) {
3106                         serial = dev2ser(serial_table[i]);
3107                         tty_port_tty_hangup(&serial->port, false);
3108                         mutex_lock(&serial->parent->mutex);
3109                         serial->parent->usb_gone = 1;
3110                         mutex_unlock(&serial->parent->mutex);
3111                         cancel_work_sync(&serial_table[i]->async_put_intf);
3112                         cancel_work_sync(&serial_table[i]->async_get_intf);
3113                         hso_serial_tty_unregister(serial);
3114                         kref_put(&serial->parent->ref, hso_serial_ref_free);
3115                 }
3116         }
3117
3118         for (i = 0; i < HSO_MAX_NET_DEVICES; i++) {
3119                 if (network_table[i] &&
3120                     (network_table[i]->interface == interface)) {
3121                         struct rfkill *rfk = dev2net(network_table[i])->rfkill;
3122                         /* hso_stop_net_device doesn't stop the net queue since
3123                          * traffic needs to start it again when suspended */
3124                         netif_stop_queue(dev2net(network_table[i])->net);
3125                         hso_stop_net_device(network_table[i]);
3126                         cancel_work_sync(&network_table[i]->async_put_intf);
3127                         cancel_work_sync(&network_table[i]->async_get_intf);
3128                         if (rfk) {
3129                                 rfkill_unregister(rfk);
3130                                 rfkill_destroy(rfk);
3131                         }
3132                         hso_free_net_device(network_table[i]);
3133                 }
3134         }
3135 }
3136
3137 /* Helper functions */
3138
3139 /* Get the endpoint ! */
3140 static struct usb_endpoint_descriptor *hso_get_ep(struct usb_interface *intf,
3141                                                   int type, int dir)
3142 {
3143         int i;
3144         struct usb_host_interface *iface = intf->cur_altsetting;
3145         struct usb_endpoint_descriptor *endp;
3146
3147         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3148                 endp = &iface->endpoint[i].desc;
3149                 if (((endp->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == dir) &&
3150                     (usb_endpoint_type(endp) == type))
3151                         return endp;
3152         }
3153
3154         return NULL;
3155 }
3156
3157 /* Get the byte that describes which ports are enabled */
3158 static int hso_get_mux_ports(struct usb_interface *intf, unsigned char *ports)
3159 {
3160         int i;
3161         struct usb_host_interface *iface = intf->cur_altsetting;
3162
3163         if (iface->extralen == 3) {
3164                 *ports = iface->extra[2];
3165                 return 0;
3166         }
3167
3168         for (i = 0; i < iface->desc.bNumEndpoints; i++) {
3169                 if (iface->endpoint[i].extralen == 3) {
3170                         *ports = iface->endpoint[i].extra[2];
3171                         return 0;
3172                 }
3173         }
3174
3175         return -1;
3176 }
3177
3178 /* interrupt urb needs to be submitted, used for serial read of muxed port */
3179 static int hso_mux_submit_intr_urb(struct hso_shared_int *shared_int,
3180                                    struct usb_device *usb, gfp_t gfp)
3181 {
3182         int result;
3183
3184         usb_fill_int_urb(shared_int->shared_intr_urb, usb,
3185                          usb_rcvintpipe(usb,
3186                                 shared_int->intr_endp->bEndpointAddress & 0x7F),
3187                          shared_int->shared_intr_buf,
3188                          1,
3189                          intr_callback, shared_int,
3190                          shared_int->intr_endp->bInterval);
3191
3192         result = usb_submit_urb(shared_int->shared_intr_urb, gfp);
3193         if (result)
3194                 dev_warn(&usb->dev, "%s failed mux_intr_urb %d\n", __func__,
3195                         result);
3196
3197         return result;
3198 }
3199
3200 /* operations setup of the serial interface */
3201 static const struct tty_operations hso_serial_ops = {
3202         .open = hso_serial_open,
3203         .close = hso_serial_close,
3204         .write = hso_serial_write,
3205         .write_room = hso_serial_write_room,
3206         .cleanup = hso_serial_cleanup,
3207         .ioctl = hso_serial_ioctl,
3208         .set_termios = hso_serial_set_termios,
3209         .chars_in_buffer = hso_serial_chars_in_buffer,
3210         .tiocmget = hso_serial_tiocmget,
3211         .tiocmset = hso_serial_tiocmset,
3212         .get_icount = hso_get_count,
3213         .unthrottle = hso_unthrottle
3214 };
3215
3216 static struct usb_driver hso_driver = {
3217         .name = driver_name,
3218         .probe = hso_probe,
3219         .disconnect = hso_disconnect,
3220         .id_table = hso_ids,
3221         .suspend = hso_suspend,
3222         .resume = hso_resume,
3223         .reset_resume = hso_resume,
3224         .supports_autosuspend = 1,
3225         .disable_hub_initiated_lpm = 1,
3226 };
3227
3228 static int __init hso_init(void)
3229 {
3230         int result;
3231
3232         /* allocate our driver using the proper amount of supported minors */
3233         tty_drv = tty_alloc_driver(HSO_SERIAL_TTY_MINORS, TTY_DRIVER_REAL_RAW |
3234                         TTY_DRIVER_DYNAMIC_DEV);
3235         if (IS_ERR(tty_drv))
3236                 return PTR_ERR(tty_drv);
3237
3238         /* fill in all needed values */
3239         tty_drv->driver_name = driver_name;
3240         tty_drv->name = tty_filename;
3241
3242         /* if major number is provided as parameter, use that one */
3243         if (tty_major)
3244                 tty_drv->major = tty_major;
3245
3246         tty_drv->minor_start = 0;
3247         tty_drv->type = TTY_DRIVER_TYPE_SERIAL;
3248         tty_drv->subtype = SERIAL_TYPE_NORMAL;
3249         tty_drv->init_termios = tty_std_termios;
3250         hso_init_termios(&tty_drv->init_termios);
3251         tty_set_operations(tty_drv, &hso_serial_ops);
3252
3253         /* register the tty driver */
3254         result = tty_register_driver(tty_drv);
3255         if (result) {
3256                 pr_err("%s - tty_register_driver failed(%d)\n",
3257                        __func__, result);
3258                 goto err_free_tty;
3259         }
3260
3261         /* register this module as an usb driver */
3262         result = usb_register(&hso_driver);
3263         if (result) {
3264                 pr_err("Could not register hso driver - error: %d\n", result);
3265                 goto err_unreg_tty;
3266         }
3267
3268         /* done */
3269         return 0;
3270 err_unreg_tty:
3271         tty_unregister_driver(tty_drv);
3272 err_free_tty:
3273         tty_driver_kref_put(tty_drv);
3274         return result;
3275 }
3276
3277 static void __exit hso_exit(void)
3278 {
3279         tty_unregister_driver(tty_drv);
3280         /* deregister the usb driver */
3281         usb_deregister(&hso_driver);
3282         tty_driver_kref_put(tty_drv);
3283 }
3284
3285 /* Module definitions */
3286 module_init(hso_init);
3287 module_exit(hso_exit);
3288
3289 MODULE_AUTHOR(MOD_AUTHOR);
3290 MODULE_DESCRIPTION(MOD_DESCRIPTION);
3291 MODULE_LICENSE("GPL");
3292
3293 /* change the debug level (eg: insmod hso.ko debug=0x04) */
3294 MODULE_PARM_DESC(debug, "debug level mask [0x01 | 0x02 | 0x04 | 0x08 | 0x10]");
3295 module_param(debug, int, 0644);
3296
3297 /* set the major tty number (eg: insmod hso.ko tty_major=245) */
3298 MODULE_PARM_DESC(tty_major, "Set the major tty number");
3299 module_param(tty_major, int, 0644);
3300
3301 /* disable network interface (eg: insmod hso.ko disable_net=1) */
3302 MODULE_PARM_DESC(disable_net, "Disable the network interface");
3303 module_param(disable_net, int, 0644);