drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/slab.h>
  28 #include <linux/tty.h>
  29 #include <linux/tty_driver.h>
  30 #include <linux/tty_flip.h>
  31 #include <linux/module.h>
  32 #include <linux/serial.h>
  33 #include <linux/usb.h>
  34 #include <linux/usb/serial.h>
  35 #include <linux/uaccess.h>
  36
  37 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  38
  39 /*
  40  * 16C50 UART register defines
  41  */
  42
  43 #define LCR_BITS_5             0x00     /* 5 bits/char */
  44 #define LCR_BITS_6             0x01     /* 6 bits/char */
  45 #define LCR_BITS_7             0x02     /* 7 bits/char */
  46 #define LCR_BITS_8             0x03     /* 8 bits/char */
  47 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  48
  49 #define LCR_STOP_1             0x00     /* 1 stop bit */
  50 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  51 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  52 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  53
  54 #define LCR_PAR_NONE           0x00     /* No parity */
  55 #define LCR_PAR_ODD            0x08     /* Odd parity */
  56 #define LCR_PAR_EVEN           0x18     /* Even parity */
  57 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  58 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  59 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  60
  61 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  62 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  63
  64 #define MCR_DTR                0x01     /* Assert DTR */
  65 #define MCR_RTS                0x02     /* Assert RTS */
  66 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  67 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  68 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  69 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  70
  71 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  72 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  73 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  74 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  75
  76 /*
  77  * Defines used for sending commands to port
  78  */
  79
  80 #define MOS_WDR_TIMEOUT         5000    /* default urb timeout */
  81
  82 #define MOS_PORT1       0x0200
  83 #define MOS_PORT2       0x0300
  84 #define MOS_VENREG      0x0000
  85 #define MOS_MAX_PORT    0x02
  86 #define MOS_WRITE       0x0E
  87 #define MOS_READ        0x0D
  88
  89 /* Requests */
  90 #define MCS_RD_RTYPE    0xC0
  91 #define MCS_WR_RTYPE    0x40
  92 #define MCS_RDREQ       0x0D
  93 #define MCS_WRREQ       0x0E
  94 #define MCS_CTRL_TIMEOUT        500
  95 #define VENDOR_READ_LENGTH      (0x01)
  96
  97 #define MAX_NAME_LEN    64
  98
  99 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 100 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 101
 102 /* For higher baud Rates use TIOCEXBAUD */
 103 #define TIOCEXBAUD     0x5462
 104
 105 /* vendor id and device id defines */
 106
 107 /* The native mos7840/7820 component */
 108 #define USB_VENDOR_ID_MOSCHIP           0x9710
 109 #define MOSCHIP_DEVICE_ID_7840          0x7840
 110 #define MOSCHIP_DEVICE_ID_7820          0x7820
 111 #define MOSCHIP_DEVICE_ID_7810          0x7810
 112 /* The native component can have its vendor/device id's overridden
 113  * in vendor-specific implementations.  Such devices can be handled
 114  * by making a change here, in id_table.
 115  */
 116 #define USB_VENDOR_ID_BANDB              0x0856
 117 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
 118 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
 119 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 120 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 121 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 122 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 123 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 124 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 125 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 126 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 127 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 128 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 129
 130 /* This driver also supports
 131  * ATEN UC2324 device using Moschip MCS7840
 132  * ATEN UC2322 device using Moschip MCS7820
 133  * MOXA UPort 2210 device using Moschip MCS7820
 134  */
 135 #define USB_VENDOR_ID_ATENINTL          0x0557
 136 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 137 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 138
 139 #define USB_VENDOR_ID_MOXA              0x110a
 140 #define MOXA_DEVICE_ID_2210             0x2210
 141
 142 /* Interrupt Routine Defines    */
 143
 144 #define SERIAL_IIR_RLS      0x06
 145 #define SERIAL_IIR_MS       0x00
 146
 147 /*
 148  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 149  */
 150 #define SERIAL_LSR_DR       0x0001
 151 #define SERIAL_LSR_OE       0x0002
 152 #define SERIAL_LSR_PE       0x0004
 153 #define SERIAL_LSR_FE       0x0008
 154 #define SERIAL_LSR_BI       0x0010
 155
 156 #define MOS_MSR_DELTA_CTS   0x10
 157 #define MOS_MSR_DELTA_DSR   0x20
 158 #define MOS_MSR_DELTA_RI    0x40
 159 #define MOS_MSR_DELTA_CD    0x80
 160
 161 /* Serial Port register Address */
 162 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 163 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 164 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 165 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 166 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 167 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 168 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 169 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 170 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 171
 172 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 173 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 174 #define GPIO_REGISTER              ((__u16)(0x07))
 175
 176 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 177
 178 /*
 179  * URB POOL related defines
 180  */
 181 #define NUM_URBS                        16      /* URB Count */
 182 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 183
 184 /* LED on/off milliseconds*/
 185 #define LED_ON_MS       500
 186 #define LED_OFF_MS      500
 187
 188 enum mos7840_flag {
 189         MOS7840_FLAG_CTRL_BUSY,
 190         MOS7840_FLAG_LED_BUSY,
 191 };
 192
 193 static const struct usb_device_id id_table[] = {
 194         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 195         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 196         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 207         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 208         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 209         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 210         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 211         {USB_DEVICE(USB_VENDOR_ID_MOXA, MOXA_DEVICE_ID_2210)},
 212         {}                      /* terminating entry */
 213 };
 214 MODULE_DEVICE_TABLE(usb, id_table);
 215
 216 /* This structure holds all of the local port information */
 217
 218 struct moschip_port {
 219         int port_num;           /*Actual port number in the device(1,2,etc) */
 220         struct urb *read_urb;   /* read URB for this port */
 221         __u8 shadowLCR;         /* last LCR value received */
 222         __u8 shadowMCR;         /* last MCR value received */
 223         char open;
 224         char open_ports;
 225         struct usb_serial_port *port;   /* loop back to the owner of this object */
 226
 227         /* Offsets */
 228         __u8 SpRegOffset;
 229         __u8 ControlRegOffset;
 230         __u8 DcrRegOffset;
 231         /* for processing control URBS in interrupt context */
 232         struct urb *control_urb;
 233         struct usb_ctrlrequest *dr;
 234         char *ctrl_buf;
 235         int MsrLsr;
 236
 237         spinlock_t pool_lock;
 238         struct urb *write_urb_pool[NUM_URBS];
 239         char busy[NUM_URBS];
 240         bool read_urb_busy;
 241
 242         /* For device(s) with LED indicator */
 243         bool has_led;
 244         struct timer_list led_timer1;   /* Timer for LED on */
 245         struct timer_list led_timer2;   /* Timer for LED off */
 246         struct urb *led_urb;
 247         struct usb_ctrlrequest *led_dr;
 248
 249         unsigned long flags;
 250 };
 251
 252 /*
 253  * mos7840_set_reg_sync
 254  *      To set the Control register by calling usb_fill_control_urb function
 255  *      by passing usb_sndctrlpipe function as parameter.
 256  */
 257
 258 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 259                                 __u16 val)
 260 {
 261         struct usb_device *dev = port->serial->dev;
 262         val = val & 0x00ff;
 263         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 264
 265         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 266                                MCS_WR_RTYPE, val, reg, NULL, 0,
 267                                MOS_WDR_TIMEOUT);
 268 }
 269
 270 /*
 271  * mos7840_get_reg_sync
 272  *      To set the Uart register by calling usb_fill_control_urb function by
 273  *      passing usb_rcvctrlpipe function as parameter.
 274  */
 275
 276 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 277                                 __u16 *val)
 278 {
 279         struct usb_device *dev = port->serial->dev;
 280         int ret = 0;
 281         u8 *buf;
 282
 283         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 284         if (!buf)
 285                 return -ENOMEM;
 286
 287         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 288                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 289                               MOS_WDR_TIMEOUT);
 290         if (ret < VENDOR_READ_LENGTH) {
 291                 if (ret >= 0)
 292                         ret = -EIO;
 293                 goto out;
 294         }
 295
 296         *val = buf[0];
 297         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 298 out:
 299         kfree(buf);
 300         return ret;
 301 }
 302
 303 /*
 304  * mos7840_set_uart_reg
 305  *      To set the Uart register by calling usb_fill_control_urb function by
 306  *      passing usb_sndctrlpipe function as parameter.
 307  */
 308
 309 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 310                                 __u16 val)
 311 {
 312
 313         struct usb_device *dev = port->serial->dev;
 314         val = val & 0x00ff;
 315         /* For the UART control registers, the application number need
 316            to be Or'ed */
 317         if (port->serial->num_ports == 4) {
 318                 val |= ((__u16)port->port_number + 1) << 8;
 319         } else {
 320                 if (port->port_number == 0) {
 321                         val |= ((__u16)port->port_number + 1) << 8;
 322                 } else {
 323                         val |= ((__u16)port->port_number + 2) << 8;
 324                 }
 325         }
 326         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 327         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 328                                MCS_WR_RTYPE, val, reg, NULL, 0,
 329                                MOS_WDR_TIMEOUT);
 330
 331 }
 332
 333 /*
 334  * mos7840_get_uart_reg
 335  *      To set the Control register by calling usb_fill_control_urb function
 336  *      by passing usb_rcvctrlpipe function as parameter.
 337  */
 338 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 339                                 __u16 *val)
 340 {
 341         struct usb_device *dev = port->serial->dev;
 342         int ret = 0;
 343         __u16 Wval;
 344         u8 *buf;
 345
 346         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 347         if (!buf)
 348                 return -ENOMEM;
 349
 350         /* Wval  is same as application number */
 351         if (port->serial->num_ports == 4) {
 352                 Wval = ((__u16)port->port_number + 1) << 8;
 353         } else {
 354                 if (port->port_number == 0) {
 355                         Wval = ((__u16)port->port_number + 1) << 8;
 356                 } else {
 357                         Wval = ((__u16)port->port_number + 2) << 8;
 358                 }
 359         }
 360         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
 361         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 362                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 363                               MOS_WDR_TIMEOUT);
 364         if (ret < VENDOR_READ_LENGTH) {
 365                 if (ret >= 0)
 366                         ret = -EIO;
 367                 goto out;
 368         }
 369         *val = buf[0];
 370 out:
 371         kfree(buf);
 372         return ret;
 373 }
 374
 375 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 376                                      struct moschip_port *mos7840_port)
 377 {
 378
 379         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 380         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 381         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 382
 383 }
 384
 385 /************************************************************************/
 386 /************************************************************************/
 387 /*             I N T E R F A C E   F U N C T I O N S                    */
 388 /*             I N T E R F A C E   F U N C T I O N S                    */
 389 /************************************************************************/
 390 /************************************************************************/
 391
 392 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 393                                             struct moschip_port *data)
 394 {
 395         usb_set_serial_port_data(port, (void *)data);
 396 }
 397
 398 static inline struct moschip_port *mos7840_get_port_private(struct
 399                                                             usb_serial_port
 400                                                             *port)
 401 {
 402         return (struct moschip_port *)usb_get_serial_port_data(port);
 403 }
 404
 405 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 406 {
 407         struct moschip_port *mos7840_port;
 408         struct async_icount *icount;
 409         mos7840_port = port;
 410         if (new_msr &
 411             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 412              MOS_MSR_DELTA_CD)) {
 413                 icount = &mos7840_port->port->icount;
 414
 415                 /* update input line counters */
 416                 if (new_msr & MOS_MSR_DELTA_CTS)
 417                         icount->cts++;
 418                 if (new_msr & MOS_MSR_DELTA_DSR)
 419                         icount->dsr++;
 420                 if (new_msr & MOS_MSR_DELTA_CD)
 421                         icount->dcd++;
 422                 if (new_msr & MOS_MSR_DELTA_RI)
 423                         icount->rng++;
 424
 425                 wake_up_interruptible(&port->port->port.delta_msr_wait);
 426         }
 427 }
 428
 429 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 430 {
 431         struct async_icount *icount;
 432
 433         if (new_lsr & SERIAL_LSR_BI) {
 434                 /*
 435                  * Parity and Framing errors only count if they
 436                  * occur exclusive of a break being
 437                  * received.
 438                  */
 439                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 440         }
 441
 442         /* update input line counters */
 443         icount = &port->port->icount;
 444         if (new_lsr & SERIAL_LSR_BI)
 445                 icount->brk++;
 446         if (new_lsr & SERIAL_LSR_OE)
 447                 icount->overrun++;
 448         if (new_lsr & SERIAL_LSR_PE)
 449                 icount->parity++;
 450         if (new_lsr & SERIAL_LSR_FE)
 451                 icount->frame++;
 452 }
 453
 454 /************************************************************************/
 455 /************************************************************************/
 456 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 457 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 458 /************************************************************************/
 459 /************************************************************************/
 460
 461 static void mos7840_control_callback(struct urb *urb)
 462 {
 463         unsigned char *data;
 464         struct moschip_port *mos7840_port;
 465         struct device *dev = &urb->dev->dev;
 466         __u8 regval = 0x0;
 467         int status = urb->status;
 468
 469         mos7840_port = urb->context;
 470
 471         switch (status) {
 472         case 0:
 473                 /* success */
 474                 break;
 475         case -ECONNRESET:
 476         case -ENOENT:
 477         case -ESHUTDOWN:
 478                 /* this urb is terminated, clean up */
 479                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 480                 goto out;
 481         default:
 482                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 483                 goto out;
 484         }
 485
 486         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
 487         if (urb->actual_length < 1)
 488                 goto out;
 489
 490         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 491                 mos7840_port->MsrLsr, mos7840_port->port_num);
 492         data = urb->transfer_buffer;
 493         regval = (__u8) data[0];
 494         dev_dbg(dev, "%s data is %x\n", __func__, regval);
 495         if (mos7840_port->MsrLsr == 0)
 496                 mos7840_handle_new_msr(mos7840_port, regval);
 497         else if (mos7840_port->MsrLsr == 1)
 498                 mos7840_handle_new_lsr(mos7840_port, regval);
 499 out:
 500         clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
 501 }
 502
 503 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 504                            __u16 *val)
 505 {
 506         struct usb_device *dev = mcs->port->serial->dev;
 507         struct usb_ctrlrequest *dr = mcs->dr;
 508         unsigned char *buffer = mcs->ctrl_buf;
 509         int ret;
 510
 511         if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
 512                 return -EBUSY;
 513
 514         dr->bRequestType = MCS_RD_RTYPE;
 515         dr->bRequest = MCS_RDREQ;
 516         dr->wValue = cpu_to_le16(Wval); /* 0 */
 517         dr->wIndex = cpu_to_le16(reg);
 518         dr->wLength = cpu_to_le16(2);
 519
 520         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 521                              (unsigned char *)dr, buffer, 2,
 522                              mos7840_control_callback, mcs);
 523         mcs->control_urb->transfer_buffer_length = 2;
 524         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 525         if (ret)
 526                 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
 527
 528         return ret;
 529 }
 530
 531 static void mos7840_set_led_callback(struct urb *urb)
 532 {
 533         switch (urb->status) {
 534         case 0:
 535                 /* Success */
 536                 break;
 537         case -ECONNRESET:
 538         case -ENOENT:
 539         case -ESHUTDOWN:
 540                 /* This urb is terminated, clean up */
 541                 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
 542                         __func__, urb->status);
 543                 break;
 544         default:
 545                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
 546                         __func__, urb->status);
 547         }
 548 }
 549
 550 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 551                                 __u16 reg)
 552 {
 553         struct usb_device *dev = mcs->port->serial->dev;
 554         struct usb_ctrlrequest *dr = mcs->led_dr;
 555
 556         dr->bRequestType = MCS_WR_RTYPE;
 557         dr->bRequest = MCS_WRREQ;
 558         dr->wValue = cpu_to_le16(wval);
 559         dr->wIndex = cpu_to_le16(reg);
 560         dr->wLength = cpu_to_le16(0);
 561
 562         usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
 563                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 564
 565         usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
 566 }
 567
 568 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 569                                 __u16 val)
 570 {
 571         struct usb_device *dev = port->serial->dev;
 572
 573         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 574                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 575 }
 576
 577 static void mos7840_led_off(unsigned long arg)
 578 {
 579         struct moschip_port *mcs = (struct moschip_port *) arg;
 580
 581         /* Turn off LED */
 582         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 583         mod_timer(&mcs->led_timer2,
 584                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 585 }
 586
 587 static void mos7840_led_flag_off(unsigned long arg)
 588 {
 589         struct moschip_port *mcs = (struct moschip_port *) arg;
 590
 591         clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
 592 }
 593
 594 static void mos7840_led_activity(struct usb_serial_port *port)
 595 {
 596         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 597
 598         if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
 599                 return;
 600
 601         mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
 602         mod_timer(&mos7840_port->led_timer1,
 603                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 604 }
 605
 606 /*****************************************************************************
 607  * mos7840_interrupt_callback
 608  *      this is the callback function for when we have received data on the
 609  *      interrupt endpoint.
 610  *****************************************************************************/
 611
 612 static void mos7840_interrupt_callback(struct urb *urb)
 613 {
 614         int result;
 615         int length;
 616         struct moschip_port *mos7840_port;
 617         struct usb_serial *serial;
 618         __u16 Data;
 619         unsigned char *data;
 620         __u8 sp[5], st;
 621         int i, rv = 0;
 622         __u16 wval, wreg = 0;
 623         int status = urb->status;
 624
 625         switch (status) {
 626         case 0:
 627                 /* success */
 628                 break;
 629         case -ECONNRESET:
 630         case -ENOENT:
 631         case -ESHUTDOWN:
 632                 /* this urb is terminated, clean up */
 633                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
 634                         __func__, status);
 635                 return;
 636         default:
 637                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
 638                         __func__, status);
 639                 goto exit;
 640         }
 641
 642         length = urb->actual_length;
 643         data = urb->transfer_buffer;
 644
 645         serial = urb->context;
 646
 647         /* Moschip get 5 bytes
 648          * Byte 1 IIR Port 1 (port.number is 0)
 649          * Byte 2 IIR Port 2 (port.number is 1)
 650          * Byte 3 IIR Port 3 (port.number is 2)
 651          * Byte 4 IIR Port 4 (port.number is 3)
 652          * Byte 5 FIFO status for both */
 653
 654         if (length > 5) {
 655                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 656                 return;
 657         }
 658
 659         sp[0] = (__u8) data[0];
 660         sp[1] = (__u8) data[1];
 661         sp[2] = (__u8) data[2];
 662         sp[3] = (__u8) data[3];
 663         st = (__u8) data[4];
 664
 665         for (i = 0; i < serial->num_ports; i++) {
 666                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 667                 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
 668                 if (mos7840_port->open) {
 669                         if (sp[i] & 0x01) {
 670                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
 671                         } else {
 672                                 switch (sp[i] & 0x0f) {
 673                                 case SERIAL_IIR_RLS:
 674                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
 675                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
 676                                         mos7840_port->MsrLsr = 1;
 677                                         wreg = LINE_STATUS_REGISTER;
 678                                         break;
 679                                 case SERIAL_IIR_MS:
 680                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
 681                                         mos7840_port->MsrLsr = 0;
 682                                         wreg = MODEM_STATUS_REGISTER;
 683                                         break;
 684                                 }
 685                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 686                         }
 687                 }
 688         }
 689         if (!(rv < 0))
 690                 /* the completion handler for the control urb will resubmit */
 691                 return;
 692 exit:
 693         result = usb_submit_urb(urb, GFP_ATOMIC);
 694         if (result) {
 695                 dev_err(&urb->dev->dev,
 696                         "%s - Error %d submitting interrupt urb\n",
 697                         __func__, result);
 698         }
 699 }
 700
 701 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 702                                        const char *function)
 703 {
 704         if (!port) {
 705                 pr_debug("%s - port == NULL\n", function);
 706                 return -1;
 707         }
 708         if (!port->serial) {
 709                 pr_debug("%s - port->serial == NULL\n", function);
 710                 return -1;
 711         }
 712
 713         return 0;
 714 }
 715
 716 /* Inline functions to check the sanity of a pointer that is passed to us */
 717 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 718                                          const char *function)
 719 {
 720         if (!serial) {
 721                 pr_debug("%s - serial == NULL\n", function);
 722                 return -1;
 723         }
 724         if (!serial->type) {
 725                 pr_debug("%s - serial->type == NULL!\n", function);
 726                 return -1;
 727         }
 728
 729         return 0;
 730 }
 731
 732 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 733                                                  const char *function)
 734 {
 735         /* if no port was specified, or it fails a paranoia check */
 736         if (!port ||
 737             mos7840_port_paranoia_check(port, function) ||
 738             mos7840_serial_paranoia_check(port->serial, function)) {
 739                 /* then say that we don't have a valid usb_serial thing,
 740                  * which will end up genrating -ENODEV return values */
 741                 return NULL;
 742         }
 743
 744         return port->serial;
 745 }
 746
 747 /*****************************************************************************
 748  * mos7840_bulk_in_callback
 749  *      this is the callback function for when we have received data on the
 750  *      bulk in endpoint.
 751  *****************************************************************************/
 752
 753 static void mos7840_bulk_in_callback(struct urb *urb)
 754 {
 755         int retval;
 756         unsigned char *data;
 757         struct usb_serial *serial;
 758         struct usb_serial_port *port;
 759         struct moschip_port *mos7840_port;
 760         int status = urb->status;
 761
 762         mos7840_port = urb->context;
 763         if (!mos7840_port)
 764                 return;
 765
 766         if (status) {
 767                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 768                 mos7840_port->read_urb_busy = false;
 769                 return;
 770         }
 771
 772         port = mos7840_port->port;
 773         if (mos7840_port_paranoia_check(port, __func__)) {
 774                 mos7840_port->read_urb_busy = false;
 775                 return;
 776         }
 777
 778         serial = mos7840_get_usb_serial(port, __func__);
 779         if (!serial) {
 780                 mos7840_port->read_urb_busy = false;
 781                 return;
 782         }
 783
 784         data = urb->transfer_buffer;
 785         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 786
 787         if (urb->actual_length) {
 788                 struct tty_port *tport = &mos7840_port->port->port;
 789                 tty_insert_flip_string(tport, data, urb->actual_length);
 790                 tty_flip_buffer_push(tport);
 791                 port->icount.rx += urb->actual_length;
 792                 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
 793         }
 794
 795         if (!mos7840_port->read_urb) {
 796                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
 797                 mos7840_port->read_urb_busy = false;
 798                 return;
 799         }
 800
 801         if (mos7840_port->has_led)
 802                 mos7840_led_activity(port);
 803
 804         mos7840_port->read_urb_busy = true;
 805         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 806
 807         if (retval) {
 808                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 809                 mos7840_port->read_urb_busy = false;
 810         }
 811 }
 812
 813 /*****************************************************************************
 814  * mos7840_bulk_out_data_callback
 815  *      this is the callback function for when we have finished sending
 816  *      serial data on the bulk out endpoint.
 817  *****************************************************************************/
 818
 819 static void mos7840_bulk_out_data_callback(struct urb *urb)
 820 {
 821         struct moschip_port *mos7840_port;
 822         struct usb_serial_port *port;
 823         int status = urb->status;
 824         int i;
 825
 826         mos7840_port = urb->context;
 827         port = mos7840_port->port;
 828         spin_lock(&mos7840_port->pool_lock);
 829         for (i = 0; i < NUM_URBS; i++) {
 830                 if (urb == mos7840_port->write_urb_pool[i]) {
 831                         mos7840_port->busy[i] = 0;
 832                         break;
 833                 }
 834         }
 835         spin_unlock(&mos7840_port->pool_lock);
 836
 837         if (status) {
 838                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 839                 return;
 840         }
 841
 842         if (mos7840_port_paranoia_check(port, __func__))
 843                 return;
 844
 845         if (mos7840_port->open)
 846                 tty_port_tty_wakeup(&port->port);
 847
 848 }
 849
 850 /************************************************************************/
 851 /*       D R I V E R  T T Y  I N T E R F A C E  F U N C T I O N S       */
 852 /************************************************************************/
 853
 854 /*****************************************************************************
 855  * mos7840_open
 856  *      this function is called by the tty driver when a port is opened
 857  *      If successful, we return 0
 858  *      Otherwise we return a negative error number.
 859  *****************************************************************************/
 860
 861 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 862 {
 863         int response;
 864         int j;
 865         struct usb_serial *serial;
 866         struct urb *urb;
 867         __u16 Data;
 868         int status;
 869         struct moschip_port *mos7840_port;
 870         struct moschip_port *port0;
 871
 872         if (mos7840_port_paranoia_check(port, __func__))
 873                 return -ENODEV;
 874
 875         serial = port->serial;
 876
 877         if (mos7840_serial_paranoia_check(serial, __func__))
 878                 return -ENODEV;
 879
 880         mos7840_port = mos7840_get_port_private(port);
 881         port0 = mos7840_get_port_private(serial->port[0]);
 882
 883         if (mos7840_port == NULL || port0 == NULL)
 884                 return -ENODEV;
 885
 886         usb_clear_halt(serial->dev, port->write_urb->pipe);
 887         usb_clear_halt(serial->dev, port->read_urb->pipe);
 888         port0->open_ports++;
 889
 890         /* Initialising the write urb pool */
 891         for (j = 0; j < NUM_URBS; ++j) {
 892                 urb = usb_alloc_urb(0, GFP_KERNEL);
 893                 mos7840_port->write_urb_pool[j] = urb;
 894                 if (!urb)
 895                         continue;
 896
 897                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 898                                                                 GFP_KERNEL);
 899                 if (!urb->transfer_buffer) {
 900                         usb_free_urb(urb);
 901                         mos7840_port->write_urb_pool[j] = NULL;
 902                         continue;
 903                 }
 904         }
 905
 906 /*****************************************************************************
 907  * Initialize MCS7840 -- Write Init values to corresponding Registers
 908  *
 909  * Register Index
 910  * 1 : IER
 911  * 2 : FCR
 912  * 3 : LCR
 913  * 4 : MCR
 914  *
 915  * 0x08 : SP1/2 Control Reg
 916  *****************************************************************************/
 917
 918         /* NEED to check the following Block */
 919
 920         Data = 0x0;
 921         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 922         if (status < 0) {
 923                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 924                 goto err;
 925         }
 926         Data |= 0x80;
 927         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 928         if (status < 0) {
 929                 dev_dbg(&port->dev, "writing Spreg failed\n");
 930                 goto err;
 931         }
 932
 933         Data &= ~0x80;
 934         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 935         if (status < 0) {
 936                 dev_dbg(&port->dev, "writing Spreg failed\n");
 937                 goto err;
 938         }
 939         /* End of block to be checked */
 940
 941         Data = 0x0;
 942         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 943                                                                         &Data);
 944         if (status < 0) {
 945                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 946                 goto err;
 947         }
 948         Data |= 0x08;           /* Driver done bit */
 949         Data |= 0x20;           /* rx_disable */
 950         status = mos7840_set_reg_sync(port,
 951                                 mos7840_port->ControlRegOffset, Data);
 952         if (status < 0) {
 953                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 954                 goto err;
 955         }
 956         /* do register settings here */
 957         /* Set all regs to the device default values. */
 958         /***********************************
 959          * First Disable all interrupts.
 960          ***********************************/
 961         Data = 0x00;
 962         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 963         if (status < 0) {
 964                 dev_dbg(&port->dev, "disabling interrupts failed\n");
 965                 goto err;
 966         }
 967         /* Set FIFO_CONTROL_REGISTER to the default value */
 968         Data = 0x00;
 969         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 970         if (status < 0) {
 971                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 972                 goto err;
 973         }
 974
 975         Data = 0xcf;
 976         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 977         if (status < 0) {
 978                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 979                 goto err;
 980         }
 981
 982         Data = 0x03;
 983         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 984         mos7840_port->shadowLCR = Data;
 985
 986         Data = 0x0b;
 987         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 988         mos7840_port->shadowMCR = Data;
 989
 990         Data = 0x00;
 991         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 992         mos7840_port->shadowLCR = Data;
 993
 994         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 995         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 996
 997         Data = 0x0c;
 998         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 999
1000         Data = 0x0;
1001         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1002
1003         Data = 0x00;
1004         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1005
1006         Data = Data & ~SERIAL_LCR_DLAB;
1007         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1008         mos7840_port->shadowLCR = Data;
1009
1010         /* clearing Bulkin and Bulkout Fifo */
1011         Data = 0x0;
1012         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1013
1014         Data = Data | 0x0c;
1015         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1016
1017         Data = Data & ~0x0c;
1018         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1019         /* Finally enable all interrupts */
1020         Data = 0x0c;
1021         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1022
1023         /* clearing rx_disable */
1024         Data = 0x0;
1025         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1026                                                                         &Data);
1027         Data = Data & ~0x20;
1028         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1029                                                                         Data);
1030
1031         /* rx_negate */
1032         Data = 0x0;
1033         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1034                                                                         &Data);
1035         Data = Data | 0x10;
1036         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1037                                                                         Data);
1038
1039         /* Check to see if we've set up our endpoint info yet    *
1040          * (can't set it up in mos7840_startup as the structures *
1041          * were not set up at that time.)                        */
1042         if (port0->open_ports == 1) {
1043                 /* FIXME: Buffer never NULL, so URB is not submitted. */
1044                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1045                         /* set up interrupt urb */
1046                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1047                                 serial->dev,
1048                                 usb_rcvintpipe(serial->dev,
1049                                 serial->port[0]->interrupt_in_endpointAddress),
1050                                 serial->port[0]->interrupt_in_buffer,
1051                                 serial->port[0]->interrupt_in_urb->
1052                                 transfer_buffer_length,
1053                                 mos7840_interrupt_callback,
1054                                 serial,
1055                                 serial->port[0]->interrupt_in_urb->interval);
1056
1057                         /* start interrupt read for mos7840 */
1058                         response =
1059                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1060                                            GFP_KERNEL);
1061                         if (response) {
1062                                 dev_err(&port->dev, "%s - Error %d submitting "
1063                                         "interrupt urb\n", __func__, response);
1064                         }
1065
1066                 }
1067
1068         }
1069
1070         /* see if we've set up our endpoint info yet   *
1071          * (can't set it up in mos7840_startup as the  *
1072          * structures were not set up at that time.)   */
1073
1074         dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1075         dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1076         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1077         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1078         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1079         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1080         mos7840_port->read_urb = port->read_urb;
1081
1082         /* set up our bulk in urb */
1083         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1084                 usb_fill_bulk_urb(mos7840_port->read_urb,
1085                         serial->dev,
1086                         usb_rcvbulkpipe(serial->dev,
1087                                 (port->bulk_in_endpointAddress) + 2),
1088                         port->bulk_in_buffer,
1089                         mos7840_port->read_urb->transfer_buffer_length,
1090                         mos7840_bulk_in_callback, mos7840_port);
1091         } else {
1092                 usb_fill_bulk_urb(mos7840_port->read_urb,
1093                         serial->dev,
1094                         usb_rcvbulkpipe(serial->dev,
1095                                 port->bulk_in_endpointAddress),
1096                         port->bulk_in_buffer,
1097                         mos7840_port->read_urb->transfer_buffer_length,
1098                         mos7840_bulk_in_callback, mos7840_port);
1099         }
1100
1101         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1102         mos7840_port->read_urb_busy = true;
1103         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1104         if (response) {
1105                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1106                         __func__, response);
1107                 mos7840_port->read_urb_busy = false;
1108         }
1109
1110         /* initialize our port settings */
1111         /* Must set to enable ints! */
1112         mos7840_port->shadowMCR = MCR_MASTER_IE;
1113         /* send a open port command */
1114         mos7840_port->open = 1;
1115         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1116
1117         return 0;
1118 err:
1119         for (j = 0; j < NUM_URBS; ++j) {
1120                 urb = mos7840_port->write_urb_pool[j];
1121                 if (!urb)
1122                         continue;
1123                 kfree(urb->transfer_buffer);
1124                 usb_free_urb(urb);
1125         }
1126         return status;
1127 }
1128
1129 /*****************************************************************************
1130  * mos7840_chars_in_buffer
1131  *      this function is called by the tty driver when it wants to know how many
1132  *      bytes of data we currently have outstanding in the port (data that has
1133  *      been written, but hasn't made it out the port yet)
1134  *      If successful, we return the number of bytes left to be written in the
1135  *      system,
1136  *      Otherwise we return zero.
1137  *****************************************************************************/
1138
1139 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1140 {
1141         struct usb_serial_port *port = tty->driver_data;
1142         int i;
1143         int chars = 0;
1144         unsigned long flags;
1145         struct moschip_port *mos7840_port;
1146
1147         if (mos7840_port_paranoia_check(port, __func__))
1148                 return 0;
1149
1150         mos7840_port = mos7840_get_port_private(port);
1151         if (mos7840_port == NULL)
1152                 return 0;
1153
1154         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1155         for (i = 0; i < NUM_URBS; ++i) {
1156                 if (mos7840_port->busy[i]) {
1157                         struct urb *urb = mos7840_port->write_urb_pool[i];
1158                         chars += urb->transfer_buffer_length;
1159                 }
1160         }
1161         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1162         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1163         return chars;
1164
1165 }
1166
1167 /*****************************************************************************
1168  * mos7840_close
1169  *      this function is called by the tty driver when a port is closed
1170  *****************************************************************************/
1171
1172 static void mos7840_close(struct usb_serial_port *port)
1173 {
1174         struct usb_serial *serial;
1175         struct moschip_port *mos7840_port;
1176         struct moschip_port *port0;
1177         int j;
1178         __u16 Data;
1179
1180         if (mos7840_port_paranoia_check(port, __func__))
1181                 return;
1182
1183         serial = mos7840_get_usb_serial(port, __func__);
1184         if (!serial)
1185                 return;
1186
1187         mos7840_port = mos7840_get_port_private(port);
1188         port0 = mos7840_get_port_private(serial->port[0]);
1189
1190         if (mos7840_port == NULL || port0 == NULL)
1191                 return;
1192
1193         for (j = 0; j < NUM_URBS; ++j)
1194                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1195
1196         /* Freeing Write URBs */
1197         for (j = 0; j < NUM_URBS; ++j) {
1198                 if (mos7840_port->write_urb_pool[j]) {
1199                         kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
1200                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1201                 }
1202         }
1203
1204         usb_kill_urb(mos7840_port->read_urb);
1205         mos7840_port->read_urb_busy = false;
1206
1207         port0->open_ports--;
1208         dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1209         if (port0->open_ports == 0) {
1210                 if (serial->port[0]->interrupt_in_urb) {
1211                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1212                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1213                 }
1214         }
1215
1216         Data = 0x0;
1217         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1218
1219         Data = 0x00;
1220         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1221
1222         mos7840_port->open = 0;
1223 }
1224
1225 /*****************************************************************************
1226  * mos7840_break
1227  *      this function sends a break to the port
1228  *****************************************************************************/
1229 static void mos7840_break(struct tty_struct *tty, int break_state)
1230 {
1231         struct usb_serial_port *port = tty->driver_data;
1232         unsigned char data;
1233         struct usb_serial *serial;
1234         struct moschip_port *mos7840_port;
1235
1236         if (mos7840_port_paranoia_check(port, __func__))
1237                 return;
1238
1239         serial = mos7840_get_usb_serial(port, __func__);
1240         if (!serial)
1241                 return;
1242
1243         mos7840_port = mos7840_get_port_private(port);
1244
1245         if (mos7840_port == NULL)
1246                 return;
1247
1248         if (break_state == -1)
1249                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1250         else
1251                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1252
1253         /* FIXME: no locking on shadowLCR anywhere in driver */
1254         mos7840_port->shadowLCR = data;
1255         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1256         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1257                              mos7840_port->shadowLCR);
1258 }
1259
1260 /*****************************************************************************
1261  * mos7840_write_room
1262  *      this function is called by the tty driver when it wants to know how many
1263  *      bytes of data we can accept for a specific port.
1264  *      If successful, we return the amount of room that we have for this port
1265  *      Otherwise we return a negative error number.
1266  *****************************************************************************/
1267
1268 static int mos7840_write_room(struct tty_struct *tty)
1269 {
1270         struct usb_serial_port *port = tty->driver_data;
1271         int i;
1272         int room = 0;
1273         unsigned long flags;
1274         struct moschip_port *mos7840_port;
1275
1276         if (mos7840_port_paranoia_check(port, __func__))
1277                 return -1;
1278
1279         mos7840_port = mos7840_get_port_private(port);
1280         if (mos7840_port == NULL)
1281                 return -1;
1282
1283         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1284         for (i = 0; i < NUM_URBS; ++i) {
1285                 if (!mos7840_port->busy[i])
1286                         room += URB_TRANSFER_BUFFER_SIZE;
1287         }
1288         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1289
1290         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1291         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1292         return room;
1293
1294 }
1295
1296 /*****************************************************************************
1297  * mos7840_write
1298  *      this function is called by the tty driver when data should be written to
1299  *      the port.
1300  *      If successful, we return the number of bytes written, otherwise we
1301  *      return a negative error number.
1302  *****************************************************************************/
1303
1304 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1305                          const unsigned char *data, int count)
1306 {
1307         int status;
1308         int i;
1309         int bytes_sent = 0;
1310         int transfer_size;
1311         unsigned long flags;
1312
1313         struct moschip_port *mos7840_port;
1314         struct usb_serial *serial;
1315         struct urb *urb;
1316         /* __u16 Data; */
1317         const unsigned char *current_position = data;
1318         unsigned char *data1;
1319
1320         if (mos7840_port_paranoia_check(port, __func__))
1321                 return -1;
1322
1323         serial = port->serial;
1324         if (mos7840_serial_paranoia_check(serial, __func__))
1325                 return -1;
1326
1327         mos7840_port = mos7840_get_port_private(port);
1328         if (mos7840_port == NULL)
1329                 return -1;
1330
1331         /* try to find a free urb in the list */
1332         urb = NULL;
1333
1334         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1335         for (i = 0; i < NUM_URBS; ++i) {
1336                 if (!mos7840_port->busy[i]) {
1337                         mos7840_port->busy[i] = 1;
1338                         urb = mos7840_port->write_urb_pool[i];
1339                         dev_dbg(&port->dev, "URB:%d\n", i);
1340                         break;
1341                 }
1342         }
1343         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1344
1345         if (urb == NULL) {
1346                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1347                 goto exit;
1348         }
1349
1350         if (urb->transfer_buffer == NULL) {
1351                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1352                                                GFP_ATOMIC);
1353                 if (!urb->transfer_buffer) {
1354                         bytes_sent = -ENOMEM;
1355                         goto exit;
1356                 }
1357         }
1358         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1359
1360         memcpy(urb->transfer_buffer, current_position, transfer_size);
1361
1362         /* fill urb with data and submit  */
1363         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1364                 usb_fill_bulk_urb(urb,
1365                         serial->dev,
1366                         usb_sndbulkpipe(serial->dev,
1367                                 (port->bulk_out_endpointAddress) + 2),
1368                         urb->transfer_buffer,
1369                         transfer_size,
1370                         mos7840_bulk_out_data_callback, mos7840_port);
1371         } else {
1372                 usb_fill_bulk_urb(urb,
1373                         serial->dev,
1374                         usb_sndbulkpipe(serial->dev,
1375                                 port->bulk_out_endpointAddress),
1376                         urb->transfer_buffer,
1377                         transfer_size,
1378                         mos7840_bulk_out_data_callback, mos7840_port);
1379         }
1380
1381         data1 = urb->transfer_buffer;
1382         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1383
1384         if (mos7840_port->has_led)
1385                 mos7840_led_activity(port);
1386
1387         /* send it down the pipe */
1388         status = usb_submit_urb(urb, GFP_ATOMIC);
1389
1390         if (status) {
1391                 mos7840_port->busy[i] = 0;
1392                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1393                         "with status = %d\n", __func__, status);
1394                 bytes_sent = status;
1395                 goto exit;
1396         }
1397         bytes_sent = transfer_size;
1398         port->icount.tx += transfer_size;
1399         dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1400 exit:
1401         return bytes_sent;
1402
1403 }
1404
1405 /*****************************************************************************
1406  * mos7840_throttle
1407  *      this function is called by the tty driver when it wants to stop the data
1408  *      being read from the port.
1409  *****************************************************************************/
1410
1411 static void mos7840_throttle(struct tty_struct *tty)
1412 {
1413         struct usb_serial_port *port = tty->driver_data;
1414         struct moschip_port *mos7840_port;
1415         int status;
1416
1417         if (mos7840_port_paranoia_check(port, __func__))
1418                 return;
1419
1420         mos7840_port = mos7840_get_port_private(port);
1421
1422         if (mos7840_port == NULL)
1423                 return;
1424
1425         if (!mos7840_port->open) {
1426                 dev_dbg(&port->dev, "%s", "port not opened\n");
1427                 return;
1428         }
1429
1430         /* if we are implementing XON/XOFF, send the stop character */
1431         if (I_IXOFF(tty)) {
1432                 unsigned char stop_char = STOP_CHAR(tty);
1433                 status = mos7840_write(tty, port, &stop_char, 1);
1434                 if (status <= 0)
1435                         return;
1436         }
1437         /* if we are implementing RTS/CTS, toggle that line */
1438         if (C_CRTSCTS(tty)) {
1439                 mos7840_port->shadowMCR &= ~MCR_RTS;
1440                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1441                                          mos7840_port->shadowMCR);
1442                 if (status < 0)
1443                         return;
1444         }
1445 }
1446
1447 /*****************************************************************************
1448  * mos7840_unthrottle
1449  *      this function is called by the tty driver when it wants to resume
1450  *      the data being read from the port (called after mos7840_throttle is
1451  *      called)
1452  *****************************************************************************/
1453 static void mos7840_unthrottle(struct tty_struct *tty)
1454 {
1455         struct usb_serial_port *port = tty->driver_data;
1456         int status;
1457         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1458
1459         if (mos7840_port_paranoia_check(port, __func__))
1460                 return;
1461
1462         if (mos7840_port == NULL)
1463                 return;
1464
1465         if (!mos7840_port->open) {
1466                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1467                 return;
1468         }
1469
1470         /* if we are implementing XON/XOFF, send the start character */
1471         if (I_IXOFF(tty)) {
1472                 unsigned char start_char = START_CHAR(tty);
1473                 status = mos7840_write(tty, port, &start_char, 1);
1474                 if (status <= 0)
1475                         return;
1476         }
1477
1478         /* if we are implementing RTS/CTS, toggle that line */
1479         if (C_CRTSCTS(tty)) {
1480                 mos7840_port->shadowMCR |= MCR_RTS;
1481                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1482                                          mos7840_port->shadowMCR);
1483                 if (status < 0)
1484                         return;
1485         }
1486 }
1487
1488 static int mos7840_tiocmget(struct tty_struct *tty)
1489 {
1490         struct usb_serial_port *port = tty->driver_data;
1491         struct moschip_port *mos7840_port;
1492         unsigned int result;
1493         __u16 msr;
1494         __u16 mcr;
1495         int status;
1496         mos7840_port = mos7840_get_port_private(port);
1497
1498         if (mos7840_port == NULL)
1499                 return -ENODEV;
1500
1501         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1502         if (status < 0)
1503                 return -EIO;
1504         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1505         if (status < 0)
1506                 return -EIO;
1507         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1508             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1509             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1510             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1511             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1512             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1513             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1514
1515         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1516
1517         return result;
1518 }
1519
1520 static int mos7840_tiocmset(struct tty_struct *tty,
1521                             unsigned int set, unsigned int clear)
1522 {
1523         struct usb_serial_port *port = tty->driver_data;
1524         struct moschip_port *mos7840_port;
1525         unsigned int mcr;
1526         int status;
1527
1528         mos7840_port = mos7840_get_port_private(port);
1529
1530         if (mos7840_port == NULL)
1531                 return -ENODEV;
1532
1533         /* FIXME: What locks the port registers ? */
1534         mcr = mos7840_port->shadowMCR;
1535         if (clear & TIOCM_RTS)
1536                 mcr &= ~MCR_RTS;
1537         if (clear & TIOCM_DTR)
1538                 mcr &= ~MCR_DTR;
1539         if (clear & TIOCM_LOOP)
1540                 mcr &= ~MCR_LOOPBACK;
1541
1542         if (set & TIOCM_RTS)
1543                 mcr |= MCR_RTS;
1544         if (set & TIOCM_DTR)
1545                 mcr |= MCR_DTR;
1546         if (set & TIOCM_LOOP)
1547                 mcr |= MCR_LOOPBACK;
1548
1549         mos7840_port->shadowMCR = mcr;
1550
1551         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1552         if (status < 0) {
1553                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1554                 return status;
1555         }
1556
1557         return 0;
1558 }
1559
1560 /*****************************************************************************
1561  * mos7840_calc_baud_rate_divisor
1562  *      this function calculates the proper baud rate divisor for the specified
1563  *      baud rate.
1564  *****************************************************************************/
1565 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1566                                           int baudRate, int *divisor,
1567                                           __u16 *clk_sel_val)
1568 {
1569         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1570
1571         if (baudRate <= 115200) {
1572                 *divisor = 115200 / baudRate;
1573                 *clk_sel_val = 0x0;
1574         }
1575         if ((baudRate > 115200) && (baudRate <= 230400)) {
1576                 *divisor = 230400 / baudRate;
1577                 *clk_sel_val = 0x10;
1578         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1579                 *divisor = 403200 / baudRate;
1580                 *clk_sel_val = 0x20;
1581         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1582                 *divisor = 460800 / baudRate;
1583                 *clk_sel_val = 0x30;
1584         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1585                 *divisor = 806400 / baudRate;
1586                 *clk_sel_val = 0x40;
1587         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1588                 *divisor = 921600 / baudRate;
1589                 *clk_sel_val = 0x50;
1590         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1591                 *divisor = 1572864 / baudRate;
1592                 *clk_sel_val = 0x60;
1593         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1594                 *divisor = 3145728 / baudRate;
1595                 *clk_sel_val = 0x70;
1596         }
1597         return 0;
1598 }
1599
1600 /*****************************************************************************
1601  * mos7840_send_cmd_write_baud_rate
1602  *      this function sends the proper command to change the baud rate of the
1603  *      specified port.
1604  *****************************************************************************/
1605
1606 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1607                                             int baudRate)
1608 {
1609         int divisor = 0;
1610         int status;
1611         __u16 Data;
1612         unsigned char number;
1613         __u16 clk_sel_val;
1614         struct usb_serial_port *port;
1615
1616         if (mos7840_port == NULL)
1617                 return -1;
1618
1619         port = mos7840_port->port;
1620         if (mos7840_port_paranoia_check(port, __func__))
1621                 return -1;
1622
1623         if (mos7840_serial_paranoia_check(port->serial, __func__))
1624                 return -1;
1625
1626         number = mos7840_port->port->port_number;
1627
1628         dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1629         /* reset clk_uart_sel in spregOffset */
1630         if (baudRate > 115200) {
1631 #ifdef HW_flow_control
1632                 /* NOTE: need to see the pther register to modify */
1633                 /* setting h/w flow control bit to 1 */
1634                 Data = 0x2b;
1635                 mos7840_port->shadowMCR = Data;
1636                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1637                                                                         Data);
1638                 if (status < 0) {
1639                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1640                         return -1;
1641                 }
1642 #endif
1643
1644         } else {
1645 #ifdef HW_flow_control
1646                 /* setting h/w flow control bit to 0 */
1647                 Data = 0xb;
1648                 mos7840_port->shadowMCR = Data;
1649                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1650                                                                         Data);
1651                 if (status < 0) {
1652                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1653                         return -1;
1654                 }
1655 #endif
1656
1657         }
1658
1659         if (1) {                /* baudRate <= 115200) */
1660                 clk_sel_val = 0x0;
1661                 Data = 0x0;
1662                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1663                                                    &clk_sel_val);
1664                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1665                                                                  &Data);
1666                 if (status < 0) {
1667                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1668                         return -1;
1669                 }
1670                 Data = (Data & 0x8f) | clk_sel_val;
1671                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1672                                                                 Data);
1673                 if (status < 0) {
1674                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1675                         return -1;
1676                 }
1677                 /* Calculate the Divisor */
1678
1679                 if (status) {
1680                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1681                         return status;
1682                 }
1683                 /* Enable access to divisor latch */
1684                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1685                 mos7840_port->shadowLCR = Data;
1686                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1687
1688                 /* Write the divisor */
1689                 Data = (unsigned char)(divisor & 0xff);
1690                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1691                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1692
1693                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1694                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1695                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1696
1697                 /* Disable access to divisor latch */
1698                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1699                 mos7840_port->shadowLCR = Data;
1700                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1701
1702         }
1703         return status;
1704 }
1705
1706 /*****************************************************************************
1707  * mos7840_change_port_settings
1708  *      This routine is called to set the UART on the device to match
1709  *      the specified new settings.
1710  *****************************************************************************/
1711
1712 static void mos7840_change_port_settings(struct tty_struct *tty,
1713         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1714 {
1715         int baud;
1716         unsigned cflag;
1717         unsigned iflag;
1718         __u8 lData;
1719         __u8 lParity;
1720         __u8 lStop;
1721         int status;
1722         __u16 Data;
1723         struct usb_serial_port *port;
1724         struct usb_serial *serial;
1725
1726         if (mos7840_port == NULL)
1727                 return;
1728
1729         port = mos7840_port->port;
1730
1731         if (mos7840_port_paranoia_check(port, __func__))
1732                 return;
1733
1734         if (mos7840_serial_paranoia_check(port->serial, __func__))
1735                 return;
1736
1737         serial = port->serial;
1738
1739         if (!mos7840_port->open) {
1740                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1741                 return;
1742         }
1743
1744         lData = LCR_BITS_8;
1745         lStop = LCR_STOP_1;
1746         lParity = LCR_PAR_NONE;
1747
1748         cflag = tty->termios.c_cflag;
1749         iflag = tty->termios.c_iflag;
1750
1751         /* Change the number of bits */
1752         switch (cflag & CSIZE) {
1753         case CS5:
1754                 lData = LCR_BITS_5;
1755                 break;
1756
1757         case CS6:
1758                 lData = LCR_BITS_6;
1759                 break;
1760
1761         case CS7:
1762                 lData = LCR_BITS_7;
1763                 break;
1764
1765         default:
1766         case CS8:
1767                 lData = LCR_BITS_8;
1768                 break;
1769         }
1770
1771         /* Change the Parity bit */
1772         if (cflag & PARENB) {
1773                 if (cflag & PARODD) {
1774                         lParity = LCR_PAR_ODD;
1775                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1776                 } else {
1777                         lParity = LCR_PAR_EVEN;
1778                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1779                 }
1780
1781         } else {
1782                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1783         }
1784
1785         if (cflag & CMSPAR)
1786                 lParity = lParity | 0x20;
1787
1788         /* Change the Stop bit */
1789         if (cflag & CSTOPB) {
1790                 lStop = LCR_STOP_2;
1791                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1792         } else {
1793                 lStop = LCR_STOP_1;
1794                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1795         }
1796
1797         /* Update the LCR with the correct value */
1798         mos7840_port->shadowLCR &=
1799             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1800         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1801
1802         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1803                 mos7840_port->shadowLCR);
1804         /* Disable Interrupts */
1805         Data = 0x00;
1806         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1807
1808         Data = 0x00;
1809         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1810
1811         Data = 0xcf;
1812         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1813
1814         /* Send the updated LCR value to the mos7840 */
1815         Data = mos7840_port->shadowLCR;
1816
1817         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1818
1819         Data = 0x00b;
1820         mos7840_port->shadowMCR = Data;
1821         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1822         Data = 0x00b;
1823         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1824
1825         /* set up the MCR register and send it to the mos7840 */
1826
1827         mos7840_port->shadowMCR = MCR_MASTER_IE;
1828         if (cflag & CBAUD)
1829                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1830
1831         if (cflag & CRTSCTS)
1832                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1833         else
1834                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1835
1836         Data = mos7840_port->shadowMCR;
1837         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1838
1839         /* Determine divisor based on baud rate */
1840         baud = tty_get_baud_rate(tty);
1841
1842         if (!baud) {
1843                 /* pick a default, any default... */
1844                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1845                 baud = 9600;
1846         }
1847
1848         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1849         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1850
1851         /* Enable Interrupts */
1852         Data = 0x0c;
1853         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1854
1855         if (!mos7840_port->read_urb_busy) {
1856                 mos7840_port->read_urb_busy = true;
1857                 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1858                 if (status) {
1859                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1860                             status);
1861                         mos7840_port->read_urb_busy = false;
1862                 }
1863         }
1864         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1865                 mos7840_port->shadowLCR);
1866 }
1867
1868 /*****************************************************************************
1869  * mos7840_set_termios
1870  *      this function is called by the tty driver when it wants to change
1871  *      the termios structure
1872  *****************************************************************************/
1873
1874 static void mos7840_set_termios(struct tty_struct *tty,
1875                                 struct usb_serial_port *port,
1876                                 struct ktermios *old_termios)
1877 {
1878         int status;
1879         struct usb_serial *serial;
1880         struct moschip_port *mos7840_port;
1881
1882         if (mos7840_port_paranoia_check(port, __func__))
1883                 return;
1884
1885         serial = port->serial;
1886
1887         if (mos7840_serial_paranoia_check(serial, __func__))
1888                 return;
1889
1890         mos7840_port = mos7840_get_port_private(port);
1891
1892         if (mos7840_port == NULL)
1893                 return;
1894
1895         if (!mos7840_port->open) {
1896                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1897                 return;
1898         }
1899
1900         /* change the port settings to the new ones specified */
1901
1902         mos7840_change_port_settings(tty, mos7840_port, old_termios);
1903
1904         if (!mos7840_port->read_urb) {
1905                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1906                 return;
1907         }
1908
1909         if (!mos7840_port->read_urb_busy) {
1910                 mos7840_port->read_urb_busy = true;
1911                 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1912                 if (status) {
1913                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1914                             status);
1915                         mos7840_port->read_urb_busy = false;
1916                 }
1917         }
1918 }
1919
1920 /*****************************************************************************
1921  * mos7840_get_lsr_info - get line status register info
1922  *
1923  * Purpose: Let user call ioctl() to get info when the UART physically
1924  *          is emptied.  On bus types like RS485, the transmitter must
1925  *          release the bus after transmitting. This must be done when
1926  *          the transmit shift register is empty, not be done when the
1927  *          transmit holding register is empty.  This functionality
1928  *          allows an RS485 driver to be written in user space.
1929  *****************************************************************************/
1930
1931 static int mos7840_get_lsr_info(struct tty_struct *tty,
1932                                 unsigned int __user *value)
1933 {
1934         int count;
1935         unsigned int result = 0;
1936
1937         count = mos7840_chars_in_buffer(tty);
1938         if (count == 0)
1939                 result = TIOCSER_TEMT;
1940
1941         if (copy_to_user(value, &result, sizeof(int)))
1942                 return -EFAULT;
1943         return 0;
1944 }
1945
1946 /*****************************************************************************
1947  * mos7840_get_serial_info
1948  *      function to get information about serial port
1949  *****************************************************************************/
1950
1951 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
1952                                    struct serial_struct __user *retinfo)
1953 {
1954         struct serial_struct tmp;
1955
1956         if (mos7840_port == NULL)
1957                 return -1;
1958
1959         memset(&tmp, 0, sizeof(tmp));
1960
1961         tmp.type = PORT_16550A;
1962         tmp.line = mos7840_port->port->minor;
1963         tmp.port = mos7840_port->port->port_number;
1964         tmp.irq = 0;
1965         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1966         tmp.baud_base = 9600;
1967         tmp.close_delay = 5 * HZ;
1968         tmp.closing_wait = 30 * HZ;
1969
1970         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1971                 return -EFAULT;
1972         return 0;
1973 }
1974
1975 /*****************************************************************************
1976  * SerialIoctl
1977  *      this function handles any ioctl calls to the driver
1978  *****************************************************************************/
1979
1980 static int mos7840_ioctl(struct tty_struct *tty,
1981                          unsigned int cmd, unsigned long arg)
1982 {
1983         struct usb_serial_port *port = tty->driver_data;
1984         void __user *argp = (void __user *)arg;
1985         struct moschip_port *mos7840_port;
1986
1987         if (mos7840_port_paranoia_check(port, __func__))
1988                 return -1;
1989
1990         mos7840_port = mos7840_get_port_private(port);
1991
1992         if (mos7840_port == NULL)
1993                 return -1;
1994
1995         switch (cmd) {
1996                 /* return number of bytes available */
1997
1998         case TIOCSERGETLSR:
1999                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2000                 return mos7840_get_lsr_info(tty, argp);
2001
2002         case TIOCGSERIAL:
2003                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2004                 return mos7840_get_serial_info(mos7840_port, argp);
2005
2006         case TIOCSSERIAL:
2007                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2008                 break;
2009         default:
2010                 break;
2011         }
2012         return -ENOIOCTLCMD;
2013 }
2014
2015 static int mos7810_check(struct usb_serial *serial)
2016 {
2017         int i, pass_count = 0;
2018         u8 *buf;
2019         __u16 data = 0, mcr_data = 0;
2020         __u16 test_pattern = 0x55AA;
2021         int res;
2022
2023         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2024         if (!buf)
2025                 return 0;       /* failed to identify 7810 */
2026
2027         /* Store MCR setting */
2028         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2029                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2030                 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2031         if (res == VENDOR_READ_LENGTH)
2032                 mcr_data = *buf;
2033
2034         for (i = 0; i < 16; i++) {
2035                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2036                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2037                         MCS_WRREQ, MCS_WR_RTYPE,
2038                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2039                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2040
2041                 /* Read the test pattern back */
2042                 res = usb_control_msg(serial->dev,
2043                                 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
2044                                 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2045                                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2046                 if (res == VENDOR_READ_LENGTH)
2047                         data = *buf;
2048
2049                 /* If this is a MCS7810 device, both test patterns must match */
2050                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2051                         break;
2052
2053                 pass_count++;
2054         }
2055
2056         /* Restore MCR setting */
2057         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2058                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2059                 0, MOS_WDR_TIMEOUT);
2060
2061         kfree(buf);
2062
2063         if (pass_count == 16)
2064                 return 1;
2065
2066         return 0;
2067 }
2068
2069 static int mos7840_probe(struct usb_serial *serial,
2070                                 const struct usb_device_id *id)
2071 {
2072         u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2073         u16 vid = le16_to_cpu(serial->dev->descriptor.idVendor);
2074         u8 *buf;
2075         int device_type;
2076
2077         if (product == MOSCHIP_DEVICE_ID_7810 ||
2078                 product == MOSCHIP_DEVICE_ID_7820) {
2079                 device_type = product;
2080                 goto out;
2081         }
2082
2083         if (vid == USB_VENDOR_ID_MOXA && product == MOXA_DEVICE_ID_2210) {
2084                 device_type = MOSCHIP_DEVICE_ID_7820;
2085                 goto out;
2086         }
2087
2088         buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2089         if (!buf)
2090                 return -ENOMEM;
2091
2092         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2093                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2094                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2095
2096         /* For a MCS7840 device GPIO0 must be set to 1 */
2097         if (buf[0] & 0x01)
2098                 device_type = MOSCHIP_DEVICE_ID_7840;
2099         else if (mos7810_check(serial))
2100                 device_type = MOSCHIP_DEVICE_ID_7810;
2101         else
2102                 device_type = MOSCHIP_DEVICE_ID_7820;
2103
2104         kfree(buf);
2105 out:
2106         usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2107
2108         return 0;
2109 }
2110
2111 static int mos7840_calc_num_ports(struct usb_serial *serial,
2112                                         struct usb_serial_endpoints *epds)
2113 {
2114         int device_type = (unsigned long)usb_get_serial_data(serial);
2115         int num_ports;
2116
2117         num_ports = (device_type >> 4) & 0x000F;
2118
2119         /*
2120          * num_ports is currently never zero as device_type is one of
2121          * MOSCHIP_DEVICE_ID_78{1,2,4}0.
2122          */
2123         if (num_ports == 0)
2124                 return -ENODEV;
2125
2126         if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
2127                 dev_err(&serial->interface->dev, "missing endpoints\n");
2128                 return -ENODEV;
2129         }
2130
2131         return num_ports;
2132 }
2133
2134 static int mos7840_port_probe(struct usb_serial_port *port)
2135 {
2136         struct usb_serial *serial = port->serial;
2137         int device_type = (unsigned long)usb_get_serial_data(serial);
2138         struct moschip_port *mos7840_port;
2139         int status;
2140         int pnum;
2141         __u16 Data;
2142
2143         /* we set up the pointers to the endpoints in the mos7840_open *
2144          * function, as the structures aren't created yet.             */
2145
2146         pnum = port->port_number;
2147
2148         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2149         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2150         if (!mos7840_port)
2151                 return -ENOMEM;
2152
2153         /* Initialize all port interrupt end point to port 0 int
2154          * endpoint. Our device has only one interrupt end point
2155          * common to all port */
2156
2157         mos7840_port->port = port;
2158         mos7840_set_port_private(port, mos7840_port);
2159         spin_lock_init(&mos7840_port->pool_lock);
2160
2161         /* minor is not initialised until later by
2162          * usb-serial.c:get_free_serial() and cannot therefore be used
2163          * to index device instances */
2164         mos7840_port->port_num = pnum + 1;
2165         dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2166         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2167
2168         if (mos7840_port->port_num == 1) {
2169                 mos7840_port->SpRegOffset = 0x0;
2170                 mos7840_port->ControlRegOffset = 0x1;
2171                 mos7840_port->DcrRegOffset = 0x4;
2172         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2173                 mos7840_port->SpRegOffset = 0x8;
2174                 mos7840_port->ControlRegOffset = 0x9;
2175                 mos7840_port->DcrRegOffset = 0x16;
2176         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2177                 mos7840_port->SpRegOffset = 0xa;
2178                 mos7840_port->ControlRegOffset = 0xb;
2179                 mos7840_port->DcrRegOffset = 0x19;
2180         } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2181                 mos7840_port->SpRegOffset = 0xa;
2182                 mos7840_port->ControlRegOffset = 0xb;
2183                 mos7840_port->DcrRegOffset = 0x19;
2184         } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2185                 mos7840_port->SpRegOffset = 0xc;
2186                 mos7840_port->ControlRegOffset = 0xd;
2187                 mos7840_port->DcrRegOffset = 0x1c;
2188         }
2189         mos7840_dump_serial_port(port, mos7840_port);
2190         mos7840_set_port_private(port, mos7840_port);
2191
2192         /* enable rx_disable bit in control register */
2193         status = mos7840_get_reg_sync(port,
2194                         mos7840_port->ControlRegOffset, &Data);
2195         if (status < 0) {
2196                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2197                 goto out;
2198         } else
2199                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2200         Data |= 0x08;   /* setting driver done bit */
2201         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2202                            modem status reg */
2203
2204         /* Data |= 0x20; //rx_disable bit */
2205         status = mos7840_set_reg_sync(port,
2206                         mos7840_port->ControlRegOffset, Data);
2207         if (status < 0) {
2208                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2209                 goto out;
2210         } else
2211                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2212
2213         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2214            and 0x24 in DCR3 */
2215         Data = 0x01;
2216         status = mos7840_set_reg_sync(port,
2217                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2218         if (status < 0) {
2219                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2220                 goto out;
2221         } else
2222                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2223
2224         Data = 0x05;
2225         status = mos7840_set_reg_sync(port,
2226                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2227         if (status < 0) {
2228                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2229                 goto out;
2230         } else
2231                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2232
2233         Data = 0x24;
2234         status = mos7840_set_reg_sync(port,
2235                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2236         if (status < 0) {
2237                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2238                 goto out;
2239         } else
2240                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2241
2242         /* write values in clkstart0x0 and clkmulti 0x20 */
2243         Data = 0x0;
2244         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2245         if (status < 0) {
2246                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2247                 goto out;
2248         } else
2249                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2250
2251         Data = 0x20;
2252         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2253         if (status < 0) {
2254                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2255                 goto error;
2256         } else
2257                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2258
2259         /* write value 0x0 to scratchpad register */
2260         Data = 0x00;
2261         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2262         if (status < 0) {
2263                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2264                 goto out;
2265         } else
2266                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2267
2268         /* Zero Length flag register */
2269         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2270                 Data = 0xff;
2271                 status = mos7840_set_reg_sync(port,
2272                                 (__u16) (ZLP_REG1 +
2273                                         ((__u16)mos7840_port->port_num)), Data);
2274                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2275                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2276                 if (status < 0) {
2277                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2278                         goto out;
2279                 } else
2280                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2281         } else {
2282                 Data = 0xff;
2283                 status = mos7840_set_reg_sync(port,
2284                                 (__u16) (ZLP_REG1 +
2285                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2286                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2287                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2288                 if (status < 0) {
2289                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2290                         goto out;
2291                 } else
2292                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2293
2294         }
2295         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2296         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2297         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2298                         GFP_KERNEL);
2299         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2300                         !mos7840_port->dr) {
2301                 status = -ENOMEM;
2302                 goto error;
2303         }
2304
2305         mos7840_port->has_led = false;
2306
2307         /* Initialize LED timers */
2308         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2309                 mos7840_port->has_led = true;
2310
2311                 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2312                 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2313                                                                 GFP_KERNEL);
2314                 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2315                         status = -ENOMEM;
2316                         goto error;
2317                 }
2318
2319                 setup_timer(&mos7840_port->led_timer1, mos7840_led_off,
2320                             (unsigned long)mos7840_port);
2321                 mos7840_port->led_timer1.expires =
2322                         jiffies + msecs_to_jiffies(LED_ON_MS);
2323                 setup_timer(&mos7840_port->led_timer2, mos7840_led_flag_off,
2324                             (unsigned long)mos7840_port);
2325                 mos7840_port->led_timer2.expires =
2326                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2327
2328                 /* Turn off LED */
2329                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2330         }
2331 out:
2332         if (pnum == serial->num_ports - 1) {
2333                 /* Zero Length flag enable */
2334                 Data = 0x0f;
2335                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2336                 if (status < 0) {
2337                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2338                         goto error;
2339                 } else
2340                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2341         }
2342         return 0;
2343 error:
2344         kfree(mos7840_port->led_dr);
2345         usb_free_urb(mos7840_port->led_urb);
2346         kfree(mos7840_port->dr);
2347         kfree(mos7840_port->ctrl_buf);
2348         usb_free_urb(mos7840_port->control_urb);
2349         kfree(mos7840_port);
2350
2351         return status;
2352 }
2353
2354 static int mos7840_port_remove(struct usb_serial_port *port)
2355 {
2356         struct moschip_port *mos7840_port;
2357
2358         mos7840_port = mos7840_get_port_private(port);
2359
2360         if (mos7840_port->has_led) {
2361                 /* Turn off LED */
2362                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2363
2364                 del_timer_sync(&mos7840_port->led_timer1);
2365                 del_timer_sync(&mos7840_port->led_timer2);
2366
2367                 usb_kill_urb(mos7840_port->led_urb);
2368                 usb_free_urb(mos7840_port->led_urb);
2369                 kfree(mos7840_port->led_dr);
2370         }
2371         usb_kill_urb(mos7840_port->control_urb);
2372         usb_free_urb(mos7840_port->control_urb);
2373         kfree(mos7840_port->ctrl_buf);
2374         kfree(mos7840_port->dr);
2375         kfree(mos7840_port);
2376
2377         return 0;
2378 }
2379
2380 static struct usb_serial_driver moschip7840_4port_device = {
2381         .driver = {
2382                    .owner = THIS_MODULE,
2383                    .name = "mos7840",
2384                    },
2385         .description = DRIVER_DESC,
2386         .id_table = id_table,
2387         .num_interrupt_in = 1,
2388         .open = mos7840_open,
2389         .close = mos7840_close,
2390         .write = mos7840_write,
2391         .write_room = mos7840_write_room,
2392         .chars_in_buffer = mos7840_chars_in_buffer,
2393         .throttle = mos7840_throttle,
2394         .unthrottle = mos7840_unthrottle,
2395         .calc_num_ports = mos7840_calc_num_ports,
2396         .probe = mos7840_probe,
2397         .ioctl = mos7840_ioctl,
2398         .set_termios = mos7840_set_termios,
2399         .break_ctl = mos7840_break,
2400         .tiocmget = mos7840_tiocmget,
2401         .tiocmset = mos7840_tiocmset,
2402         .tiocmiwait = usb_serial_generic_tiocmiwait,
2403         .get_icount = usb_serial_generic_get_icount,
2404         .port_probe = mos7840_port_probe,
2405         .port_remove = mos7840_port_remove,
2406         .read_bulk_callback = mos7840_bulk_in_callback,
2407         .read_int_callback = mos7840_interrupt_callback,
2408 };
2409
2410 static struct usb_serial_driver * const serial_drivers[] = {
2411         &moschip7840_4port_device, NULL
2412 };
2413
2414 module_usb_serial_driver(serial_drivers, id_table);
2415
2416 MODULE_DESCRIPTION(DRIVER_DESC);
2417 MODULE_LICENSE("GPL");