drivers/usb/serial/pl2303.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Prolific PL2303 USB to serial adaptor driver
   4  *
   5  * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
   6  * Copyright (C) 2003 IBM Corp.
   7  *
   8  * Original driver for 2.2.x by anonymous
   9  *
  10  * See Documentation/usb/usb-serial.rst for more information on using this
  11  * driver
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/errno.h>
  16 #include <linux/slab.h>
  17 #include <linux/tty.h>
  18 #include <linux/tty_driver.h>
  19 #include <linux/tty_flip.h>
  20 #include <linux/serial.h>
  21 #include <linux/module.h>
  22 #include <linux/moduleparam.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/usb.h>
  26 #include <linux/usb/serial.h>
  27 #include <asm/unaligned.h>
  28 #include "pl2303.h"
  29
  30
  31 #define PL2303_QUIRK_UART_STATE_IDX0            BIT(0)
  32 #define PL2303_QUIRK_LEGACY                     BIT(1)
  33 #define PL2303_QUIRK_ENDPOINT_HACK              BIT(2)
  34
  35 static const struct usb_device_id id_table[] = {
  36         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID),
  37                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  38         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  39         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
  40         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
  41         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_CHILITAG) },
  42         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
  43         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
  44         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
  45         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
  46         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
  47         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
  48         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
  49         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_TB) },
  50         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GC) },
  51         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GB) },
  52         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GT) },
  53         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GL) },
  54         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GE) },
  55         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GS) },
  56         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  57         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
  58         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID),
  59                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  60         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC485),
  61                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  62         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC232B),
  63                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  64         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) },
  65         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  66         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  67         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  68         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  69         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
  70         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  71         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  72         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  73         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  74         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  75         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  76         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  77         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
  78                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  79         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
  80                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  81         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
  82                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  83         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81),
  84                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  85         { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
  86         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  87         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
  88         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
  89         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
  90         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
  91         { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
  92         { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
  93         { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
  94         { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID),
  95                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  96         { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
  97         { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
  98         { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
  99         { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
 100         { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
 101         { USB_DEVICE(HP_VENDOR_ID, HP_LD220TA_PRODUCT_ID) },
 102         { USB_DEVICE(HP_VENDOR_ID, HP_LD381_PRODUCT_ID) },
 103         { USB_DEVICE(HP_VENDOR_ID, HP_LD381GC_PRODUCT_ID) },
 104         { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
 105         { USB_DEVICE(HP_VENDOR_ID, HP_LD960TA_PRODUCT_ID) },
 106         { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
 107         { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
 108         { USB_DEVICE(HP_VENDOR_ID, HP_LM920_PRODUCT_ID) },
 109         { USB_DEVICE(HP_VENDOR_ID, HP_LM930_PRODUCT_ID) },
 110         { USB_DEVICE(HP_VENDOR_ID, HP_LM940_PRODUCT_ID) },
 111         { USB_DEVICE(HP_VENDOR_ID, HP_TD620_PRODUCT_ID) },
 112         { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
 113         { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
 114         { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
 115         { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
 116         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
 117         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530GC_PRODUCT_ID) },
 118         { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
 119         { USB_DEVICE(AT_VENDOR_ID, AT_VTKIT3_PRODUCT_ID) },
 120         { USB_DEVICE(IBM_VENDOR_ID, IBM_PRODUCT_ID) },
 121         { }                                     /* Terminating entry */
 122 };
 123
 124 MODULE_DEVICE_TABLE(usb, id_table);
 125
 126 #define SET_LINE_REQUEST_TYPE           0x21
 127 #define SET_LINE_REQUEST                0x20
 128
 129 #define SET_CONTROL_REQUEST_TYPE        0x21
 130 #define SET_CONTROL_REQUEST             0x22
 131 #define CONTROL_DTR                     0x01
 132 #define CONTROL_RTS                     0x02
 133
 134 #define BREAK_REQUEST_TYPE              0x21
 135 #define BREAK_REQUEST                   0x23
 136 #define BREAK_ON                        0xffff
 137 #define BREAK_OFF                       0x0000
 138
 139 #define GET_LINE_REQUEST_TYPE           0xa1
 140 #define GET_LINE_REQUEST                0x21
 141
 142 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 143 #define VENDOR_WRITE_REQUEST            0x01
 144 #define VENDOR_WRITE_NREQUEST           0x80
 145
 146 #define VENDOR_READ_REQUEST_TYPE        0xc0
 147 #define VENDOR_READ_REQUEST             0x01
 148 #define VENDOR_READ_NREQUEST            0x81
 149
 150 #define UART_STATE_INDEX                8
 151 #define UART_STATE_MSR_MASK             0x8b
 152 #define UART_STATE_TRANSIENT_MASK       0x74
 153 #define UART_DCD                        0x01
 154 #define UART_DSR                        0x02
 155 #define UART_BREAK_ERROR                0x04
 156 #define UART_RING                       0x08
 157 #define UART_FRAME_ERROR                0x10
 158 #define UART_PARITY_ERROR               0x20
 159 #define UART_OVERRUN_ERROR              0x40
 160 #define UART_CTS                        0x80
 161
 162 #define PL2303_FLOWCTRL_MASK            0xf0
 163
 164 #define PL2303_READ_TYPE_HX_STATUS      0x8080
 165
 166 #define PL2303_HXN_RESET_REG            0x07
 167 #define PL2303_HXN_RESET_UPSTREAM_PIPE  0x02
 168 #define PL2303_HXN_RESET_DOWNSTREAM_PIPE        0x01
 169
 170 #define PL2303_HXN_FLOWCTRL_REG         0x0a
 171 #define PL2303_HXN_FLOWCTRL_MASK        0x1c
 172 #define PL2303_HXN_FLOWCTRL_NONE        0x1c
 173 #define PL2303_HXN_FLOWCTRL_RTS_CTS     0x18
 174 #define PL2303_HXN_FLOWCTRL_XON_XOFF    0x0c
 175
 176 static void pl2303_set_break(struct usb_serial_port *port, bool enable);
 177
 178 enum pl2303_type {
 179         TYPE_01,        /* Type 0 and 1 (difference unknown) */
 180         TYPE_HX,        /* HX version of the pl2303 chip */
 181         TYPE_HXN,       /* HXN version of the pl2303 chip */
 182         TYPE_COUNT
 183 };
 184
 185 struct pl2303_type_data {
 186         speed_t max_baud_rate;
 187         unsigned long quirks;
 188         unsigned int no_autoxonxoff:1;
 189         unsigned int no_divisors:1;
 190 };
 191
 192 struct pl2303_serial_private {
 193         const struct pl2303_type_data *type;
 194         unsigned long quirks;
 195 };
 196
 197 struct pl2303_private {
 198         spinlock_t lock;
 199         u8 line_control;
 200         u8 line_status;
 201
 202         u8 line_settings[7];
 203 };
 204
 205 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
 206         [TYPE_01] = {
 207                 .max_baud_rate          = 1228800,
 208                 .quirks                 = PL2303_QUIRK_LEGACY,
 209                 .no_autoxonxoff         = true,
 210         },
 211         [TYPE_HX] = {
 212                 .max_baud_rate          = 12000000,
 213         },
 214         [TYPE_HXN] = {
 215                 .max_baud_rate          = 12000000,
 216                 .no_divisors            = true,
 217         },
 218 };
 219
 220 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
 221                                                         unsigned char buf[1])
 222 {
 223         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 224         struct device *dev = &serial->interface->dev;
 225         u8 request;
 226         int res;
 227
 228         if (spriv->type == &pl2303_type_data[TYPE_HXN])
 229                 request = VENDOR_READ_NREQUEST;
 230         else
 231                 request = VENDOR_READ_REQUEST;
 232
 233         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 234                         request, VENDOR_READ_REQUEST_TYPE,
 235                         value, 0, buf, 1, 100);
 236         if (res != 1) {
 237                 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
 238                                                                 value, res);
 239                 if (res >= 0)
 240                         res = -EIO;
 241
 242                 return res;
 243         }
 244
 245         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
 246
 247         return 0;
 248 }
 249
 250 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
 251 {
 252         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 253         struct device *dev = &serial->interface->dev;
 254         u8 request;
 255         int res;
 256
 257         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
 258
 259         if (spriv->type == &pl2303_type_data[TYPE_HXN])
 260                 request = VENDOR_WRITE_NREQUEST;
 261         else
 262                 request = VENDOR_WRITE_REQUEST;
 263
 264         res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 265                         request, VENDOR_WRITE_REQUEST_TYPE,
 266                         value, index, NULL, 0, 100);
 267         if (res) {
 268                 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
 269                                                                 value, res);
 270                 return res;
 271         }
 272
 273         return 0;
 274 }
 275
 276 static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val)
 277 {
 278         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 279         int ret = 0;
 280         u8 *buf;
 281
 282         buf = kmalloc(1, GFP_KERNEL);
 283         if (!buf)
 284                 return -ENOMEM;
 285
 286         if (spriv->type == &pl2303_type_data[TYPE_HXN])
 287                 ret = pl2303_vendor_read(serial, reg, buf);
 288         else
 289                 ret = pl2303_vendor_read(serial, reg | 0x80, buf);
 290
 291         if (ret)
 292                 goto out_free;
 293
 294         *buf &= ~mask;
 295         *buf |= val & mask;
 296
 297         ret = pl2303_vendor_write(serial, reg, *buf);
 298 out_free:
 299         kfree(buf);
 300
 301         return ret;
 302 }
 303
 304 static int pl2303_probe(struct usb_serial *serial,
 305                                         const struct usb_device_id *id)
 306 {
 307         usb_set_serial_data(serial, (void *)id->driver_info);
 308
 309         return 0;
 310 }
 311
 312 /*
 313  * Use interrupt endpoint from first interface if available.
 314  *
 315  * This is needed due to the looney way its endpoints are set up.
 316  */
 317 static int pl2303_endpoint_hack(struct usb_serial *serial,
 318                                         struct usb_serial_endpoints *epds)
 319 {
 320         struct usb_interface *interface = serial->interface;
 321         struct usb_device *dev = serial->dev;
 322         struct device *ddev = &interface->dev;
 323         struct usb_host_interface *iface_desc;
 324         struct usb_endpoint_descriptor *endpoint;
 325         unsigned int i;
 326
 327         if (interface == dev->actconfig->interface[0])
 328                 return 0;
 329
 330         /* check out the endpoints of the other interface */
 331         iface_desc = dev->actconfig->interface[0]->cur_altsetting;
 332
 333         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 334                 endpoint = &iface_desc->endpoint[i].desc;
 335
 336                 if (!usb_endpoint_is_int_in(endpoint))
 337                         continue;
 338
 339                 dev_dbg(ddev, "found interrupt in on separate interface\n");
 340                 if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
 341                         epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
 342         }
 343
 344         return 0;
 345 }
 346
 347 static int pl2303_calc_num_ports(struct usb_serial *serial,
 348                                         struct usb_serial_endpoints *epds)
 349 {
 350         unsigned long quirks = (unsigned long)usb_get_serial_data(serial);
 351         struct device *dev = &serial->interface->dev;
 352         int ret;
 353
 354         if (quirks & PL2303_QUIRK_ENDPOINT_HACK) {
 355                 ret = pl2303_endpoint_hack(serial, epds);
 356                 if (ret)
 357                         return ret;
 358         }
 359
 360         if (epds->num_interrupt_in < 1) {
 361                 dev_err(dev, "required interrupt-in endpoint missing\n");
 362                 return -ENODEV;
 363         }
 364
 365         return 1;
 366 }
 367
 368 static int pl2303_startup(struct usb_serial *serial)
 369 {
 370         struct pl2303_serial_private *spriv;
 371         enum pl2303_type type = TYPE_01;
 372         unsigned char *buf;
 373         int res;
 374
 375         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
 376         if (!spriv)
 377                 return -ENOMEM;
 378
 379         buf = kmalloc(1, GFP_KERNEL);
 380         if (!buf) {
 381                 kfree(spriv);
 382                 return -ENOMEM;
 383         }
 384
 385         if (serial->dev->descriptor.bDeviceClass == 0x02)
 386                 type = TYPE_01;         /* type 0 */
 387         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 388                 type = TYPE_HX;
 389         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 390                 type = TYPE_01;         /* type 1 */
 391         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 392                 type = TYPE_01;         /* type 1 */
 393         dev_dbg(&serial->interface->dev, "device type: %d\n", type);
 394
 395         if (type == TYPE_HX) {
 396                 res = usb_control_msg(serial->dev,
 397                                 usb_rcvctrlpipe(serial->dev, 0),
 398                                 VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
 399                                 PL2303_READ_TYPE_HX_STATUS, 0, buf, 1, 100);
 400                 if (res != 1)
 401                         type = TYPE_HXN;
 402         }
 403
 404         spriv->type = &pl2303_type_data[type];
 405         spriv->quirks = (unsigned long)usb_get_serial_data(serial);
 406         spriv->quirks |= spriv->type->quirks;
 407
 408         usb_set_serial_data(serial, spriv);
 409
 410         if (type != TYPE_HXN) {
 411                 pl2303_vendor_read(serial, 0x8484, buf);
 412                 pl2303_vendor_write(serial, 0x0404, 0);
 413                 pl2303_vendor_read(serial, 0x8484, buf);
 414                 pl2303_vendor_read(serial, 0x8383, buf);
 415                 pl2303_vendor_read(serial, 0x8484, buf);
 416                 pl2303_vendor_write(serial, 0x0404, 1);
 417                 pl2303_vendor_read(serial, 0x8484, buf);
 418                 pl2303_vendor_read(serial, 0x8383, buf);
 419                 pl2303_vendor_write(serial, 0, 1);
 420                 pl2303_vendor_write(serial, 1, 0);
 421                 if (spriv->quirks & PL2303_QUIRK_LEGACY)
 422                         pl2303_vendor_write(serial, 2, 0x24);
 423                 else
 424                         pl2303_vendor_write(serial, 2, 0x44);
 425         }
 426
 427         kfree(buf);
 428
 429         return 0;
 430 }
 431
 432 static void pl2303_release(struct usb_serial *serial)
 433 {
 434         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 435
 436         kfree(spriv);
 437 }
 438
 439 static int pl2303_port_probe(struct usb_serial_port *port)
 440 {
 441         struct pl2303_private *priv;
 442
 443         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 444         if (!priv)
 445                 return -ENOMEM;
 446
 447         spin_lock_init(&priv->lock);
 448
 449         usb_set_serial_port_data(port, priv);
 450
 451         port->port.drain_delay = 256;
 452
 453         return 0;
 454 }
 455
 456 static int pl2303_port_remove(struct usb_serial_port *port)
 457 {
 458         struct pl2303_private *priv = usb_get_serial_port_data(port);
 459
 460         kfree(priv);
 461
 462         return 0;
 463 }
 464
 465 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
 466 {
 467         struct usb_device *dev = port->serial->dev;
 468         int retval;
 469
 470         dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
 471
 472         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 473                                  SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 474                                  value, 0, NULL, 0, 100);
 475         if (retval)
 476                 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
 477
 478         return retval;
 479 }
 480
 481 /*
 482  * Returns the nearest supported baud rate that can be set directly without
 483  * using divisors.
 484  */
 485 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
 486 {
 487         static const speed_t baud_sup[] = {
 488                 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
 489                 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
 490                 614400, 921600, 1228800, 2457600, 3000000, 6000000
 491         };
 492
 493         unsigned i;
 494
 495         for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
 496                 if (baud_sup[i] > baud)
 497                         break;
 498         }
 499
 500         if (i == ARRAY_SIZE(baud_sup))
 501                 baud = baud_sup[i - 1];
 502         else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
 503                 baud = baud_sup[i - 1];
 504         else
 505                 baud = baud_sup[i];
 506
 507         return baud;
 508 }
 509
 510 /*
 511  * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
 512  *       use 9600 baud.
 513  */
 514 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
 515                                                                 speed_t baud)
 516 {
 517         put_unaligned_le32(baud, buf);
 518
 519         return baud;
 520 }
 521
 522 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
 523                                                                 speed_t baud)
 524 {
 525         unsigned int baseline, mantissa, exponent;
 526
 527         /*
 528          * Apparently the formula is:
 529          *   baudrate = 12M * 32 / (mantissa * 4^exponent)
 530          * where
 531          *   mantissa = buf[8:0]
 532          *   exponent = buf[11:9]
 533          */
 534         baseline = 12000000 * 32;
 535         mantissa = baseline / baud;
 536         if (mantissa == 0)
 537                 mantissa = 1;   /* Avoid dividing by zero if baud > 32*12M. */
 538         exponent = 0;
 539         while (mantissa >= 512) {
 540                 if (exponent < 7) {
 541                         mantissa >>= 2; /* divide by 4 */
 542                         exponent++;
 543                 } else {
 544                         /* Exponent is maxed. Trim mantissa and leave. */
 545                         mantissa = 511;
 546                         break;
 547                 }
 548         }
 549
 550         buf[3] = 0x80;
 551         buf[2] = 0;
 552         buf[1] = exponent << 1 | mantissa >> 8;
 553         buf[0] = mantissa & 0xff;
 554
 555         /* Calculate and return the exact baud rate. */
 556         baud = (baseline / mantissa) >> (exponent << 1);
 557
 558         return baud;
 559 }
 560
 561 static void pl2303_encode_baud_rate(struct tty_struct *tty,
 562                                         struct usb_serial_port *port,
 563                                         u8 buf[4])
 564 {
 565         struct usb_serial *serial = port->serial;
 566         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 567         speed_t baud_sup;
 568         speed_t baud;
 569
 570         baud = tty_get_baud_rate(tty);
 571         dev_dbg(&port->dev, "baud requested = %u\n", baud);
 572         if (!baud)
 573                 return;
 574
 575         if (spriv->type->max_baud_rate)
 576                 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
 577         /*
 578          * Use direct method for supported baud rates, otherwise use divisors.
 579          * Newer chip types do not support divisor encoding.
 580          */
 581         if (spriv->type->no_divisors)
 582                 baud_sup = baud;
 583         else
 584                 baud_sup = pl2303_get_supported_baud_rate(baud);
 585
 586         if (baud == baud_sup)
 587                 baud = pl2303_encode_baud_rate_direct(buf, baud);
 588         else
 589                 baud = pl2303_encode_baud_rate_divisor(buf, baud);
 590
 591         /* Save resulting baud rate */
 592         tty_encode_baud_rate(tty, baud, baud);
 593         dev_dbg(&port->dev, "baud set = %u\n", baud);
 594 }
 595
 596 static int pl2303_get_line_request(struct usb_serial_port *port,
 597                                                         unsigned char buf[7])
 598 {
 599         struct usb_device *udev = port->serial->dev;
 600         int ret;
 601
 602         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 603                                 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 604                                 0, 0, buf, 7, 100);
 605         if (ret != 7) {
 606                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 607
 608                 if (ret >= 0)
 609                         ret = -EIO;
 610
 611                 return ret;
 612         }
 613
 614         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 615
 616         return 0;
 617 }
 618
 619 static int pl2303_set_line_request(struct usb_serial_port *port,
 620                                                         unsigned char buf[7])
 621 {
 622         struct usb_device *udev = port->serial->dev;
 623         int ret;
 624
 625         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 626                                 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 627                                 0, 0, buf, 7, 100);
 628         if (ret < 0) {
 629                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 630                 return ret;
 631         }
 632
 633         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 634
 635         return 0;
 636 }
 637
 638 static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b)
 639 {
 640         bool ixon_change;
 641
 642         ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) ||
 643                         a->c_cc[VSTART] != b->c_cc[VSTART] ||
 644                         a->c_cc[VSTOP] != b->c_cc[VSTOP];
 645
 646         return tty_termios_hw_change(a, b) || ixon_change;
 647 }
 648
 649 static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type)
 650 {
 651         if (!I_IXON(tty) || I_IXANY(tty))
 652                 return false;
 653
 654         if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13)
 655                 return false;
 656
 657         if (type->no_autoxonxoff)
 658                 return false;
 659
 660         return true;
 661 }
 662
 663 static void pl2303_set_termios(struct tty_struct *tty,
 664                 struct usb_serial_port *port, struct ktermios *old_termios)
 665 {
 666         struct usb_serial *serial = port->serial;
 667         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 668         struct pl2303_private *priv = usb_get_serial_port_data(port);
 669         unsigned long flags;
 670         unsigned char *buf;
 671         int ret;
 672         u8 control;
 673
 674         if (old_termios && !pl2303_termios_change(&tty->termios, old_termios))
 675                 return;
 676
 677         buf = kzalloc(7, GFP_KERNEL);
 678         if (!buf) {
 679                 /* Report back no change occurred */
 680                 if (old_termios)
 681                         tty->termios = *old_termios;
 682                 return;
 683         }
 684
 685         pl2303_get_line_request(port, buf);
 686
 687         switch (C_CSIZE(tty)) {
 688         case CS5:
 689                 buf[6] = 5;
 690                 break;
 691         case CS6:
 692                 buf[6] = 6;
 693                 break;
 694         case CS7:
 695                 buf[6] = 7;
 696                 break;
 697         default:
 698         case CS8:
 699                 buf[6] = 8;
 700         }
 701         dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
 702
 703         /* For reference buf[0]:buf[3] baud rate value */
 704         pl2303_encode_baud_rate(tty, port, &buf[0]);
 705
 706         /* For reference buf[4]=0 is 1 stop bits */
 707         /* For reference buf[4]=1 is 1.5 stop bits */
 708         /* For reference buf[4]=2 is 2 stop bits */
 709         if (C_CSTOPB(tty)) {
 710                 /*
 711                  * NOTE: Comply with "real" UARTs / RS232:
 712                  *       use 1.5 instead of 2 stop bits with 5 data bits
 713                  */
 714                 if (C_CSIZE(tty) == CS5) {
 715                         buf[4] = 1;
 716                         dev_dbg(&port->dev, "stop bits = 1.5\n");
 717                 } else {
 718                         buf[4] = 2;
 719                         dev_dbg(&port->dev, "stop bits = 2\n");
 720                 }
 721         } else {
 722                 buf[4] = 0;
 723                 dev_dbg(&port->dev, "stop bits = 1\n");
 724         }
 725
 726         if (C_PARENB(tty)) {
 727                 /* For reference buf[5]=0 is none parity */
 728                 /* For reference buf[5]=1 is odd parity */
 729                 /* For reference buf[5]=2 is even parity */
 730                 /* For reference buf[5]=3 is mark parity */
 731                 /* For reference buf[5]=4 is space parity */
 732                 if (C_PARODD(tty)) {
 733                         if (C_CMSPAR(tty)) {
 734                                 buf[5] = 3;
 735                                 dev_dbg(&port->dev, "parity = mark\n");
 736                         } else {
 737                                 buf[5] = 1;
 738                                 dev_dbg(&port->dev, "parity = odd\n");
 739                         }
 740                 } else {
 741                         if (C_CMSPAR(tty)) {
 742                                 buf[5] = 4;
 743                                 dev_dbg(&port->dev, "parity = space\n");
 744                         } else {
 745                                 buf[5] = 2;
 746                                 dev_dbg(&port->dev, "parity = even\n");
 747                         }
 748                 }
 749         } else {
 750                 buf[5] = 0;
 751                 dev_dbg(&port->dev, "parity = none\n");
 752         }
 753
 754         /*
 755          * Some PL2303 are known to lose bytes if you change serial settings
 756          * even to the same values as before. Thus we actually need to filter
 757          * in this specific case.
 758          *
 759          * Note that the tty_termios_hw_change check above is not sufficient
 760          * as a previously requested baud rate may differ from the one
 761          * actually used (and stored in old_termios).
 762          *
 763          * NOTE: No additional locking needed for line_settings as it is
 764          *       only used in set_termios, which is serialised against itself.
 765          */
 766         if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
 767                 ret = pl2303_set_line_request(port, buf);
 768                 if (!ret)
 769                         memcpy(priv->line_settings, buf, 7);
 770         }
 771
 772         /* change control lines if we are switching to or from B0 */
 773         spin_lock_irqsave(&priv->lock, flags);
 774         control = priv->line_control;
 775         if (C_BAUD(tty) == B0)
 776                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 777         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
 778                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 779         if (control != priv->line_control) {
 780                 control = priv->line_control;
 781                 spin_unlock_irqrestore(&priv->lock, flags);
 782                 pl2303_set_control_lines(port, control);
 783         } else {
 784                 spin_unlock_irqrestore(&priv->lock, flags);
 785         }
 786
 787         if (C_CRTSCTS(tty)) {
 788                 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 789                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40);
 790                 } else if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 791                         pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 792                                         PL2303_HXN_FLOWCTRL_MASK,
 793                                         PL2303_HXN_FLOWCTRL_RTS_CTS);
 794                 } else {
 795                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60);
 796                 }
 797         } else if (pl2303_enable_xonxoff(tty, spriv->type)) {
 798                 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 799                         pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 800                                         PL2303_HXN_FLOWCTRL_MASK,
 801                                         PL2303_HXN_FLOWCTRL_XON_XOFF);
 802                 } else {
 803                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0);
 804                 }
 805         } else {
 806                 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 807                         pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 808                                         PL2303_HXN_FLOWCTRL_MASK,
 809                                         PL2303_HXN_FLOWCTRL_NONE);
 810                 } else {
 811                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0);
 812                 }
 813         }
 814
 815         kfree(buf);
 816 }
 817
 818 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
 819 {
 820         struct pl2303_private *priv = usb_get_serial_port_data(port);
 821         unsigned long flags;
 822         u8 control;
 823
 824         spin_lock_irqsave(&priv->lock, flags);
 825         if (on)
 826                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 827         else
 828                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 829         control = priv->line_control;
 830         spin_unlock_irqrestore(&priv->lock, flags);
 831
 832         pl2303_set_control_lines(port, control);
 833 }
 834
 835 static void pl2303_close(struct usb_serial_port *port)
 836 {
 837         usb_serial_generic_close(port);
 838         usb_kill_urb(port->interrupt_in_urb);
 839         pl2303_set_break(port, false);
 840 }
 841
 842 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
 843 {
 844         struct usb_serial *serial = port->serial;
 845         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 846         int result;
 847
 848         if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 849                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 850                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 851         } else {
 852                 /* reset upstream data pipes */
 853                 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 854                         pl2303_vendor_write(serial, PL2303_HXN_RESET_REG,
 855                                         PL2303_HXN_RESET_UPSTREAM_PIPE |
 856                                         PL2303_HXN_RESET_DOWNSTREAM_PIPE);
 857                 } else {
 858                         pl2303_vendor_write(serial, 8, 0);
 859                         pl2303_vendor_write(serial, 9, 0);
 860                 }
 861         }
 862
 863         /* Setup termios */
 864         if (tty)
 865                 pl2303_set_termios(tty, port, NULL);
 866
 867         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 868         if (result) {
 869                 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
 870                         result);
 871                 return result;
 872         }
 873
 874         result = usb_serial_generic_open(tty, port);
 875         if (result) {
 876                 usb_kill_urb(port->interrupt_in_urb);
 877                 return result;
 878         }
 879
 880         return 0;
 881 }
 882
 883 static int pl2303_tiocmset(struct tty_struct *tty,
 884                            unsigned int set, unsigned int clear)
 885 {
 886         struct usb_serial_port *port = tty->driver_data;
 887         struct pl2303_private *priv = usb_get_serial_port_data(port);
 888         unsigned long flags;
 889         u8 control;
 890         int ret;
 891
 892         spin_lock_irqsave(&priv->lock, flags);
 893         if (set & TIOCM_RTS)
 894                 priv->line_control |= CONTROL_RTS;
 895         if (set & TIOCM_DTR)
 896                 priv->line_control |= CONTROL_DTR;
 897         if (clear & TIOCM_RTS)
 898                 priv->line_control &= ~CONTROL_RTS;
 899         if (clear & TIOCM_DTR)
 900                 priv->line_control &= ~CONTROL_DTR;
 901         control = priv->line_control;
 902         spin_unlock_irqrestore(&priv->lock, flags);
 903
 904         ret = pl2303_set_control_lines(port, control);
 905         if (ret)
 906                 return usb_translate_errors(ret);
 907
 908         return 0;
 909 }
 910
 911 static int pl2303_tiocmget(struct tty_struct *tty)
 912 {
 913         struct usb_serial_port *port = tty->driver_data;
 914         struct pl2303_private *priv = usb_get_serial_port_data(port);
 915         unsigned long flags;
 916         unsigned int mcr;
 917         unsigned int status;
 918         unsigned int result;
 919
 920         spin_lock_irqsave(&priv->lock, flags);
 921         mcr = priv->line_control;
 922         status = priv->line_status;
 923         spin_unlock_irqrestore(&priv->lock, flags);
 924
 925         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 926                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 927                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 928                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 929                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 930                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 931
 932         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
 933
 934         return result;
 935 }
 936
 937 static int pl2303_carrier_raised(struct usb_serial_port *port)
 938 {
 939         struct pl2303_private *priv = usb_get_serial_port_data(port);
 940
 941         if (priv->line_status & UART_DCD)
 942                 return 1;
 943
 944         return 0;
 945 }
 946
 947 static int pl2303_get_serial(struct tty_struct *tty,
 948                         struct serial_struct *ss)
 949 {
 950         struct usb_serial_port *port = tty->driver_data;
 951
 952         ss->type = PORT_16654;
 953         ss->line = port->minor;
 954         ss->port = port->port_number;
 955         ss->baud_base = 460800;
 956         return 0;
 957 }
 958
 959 static void pl2303_set_break(struct usb_serial_port *port, bool enable)
 960 {
 961         struct usb_serial *serial = port->serial;
 962         u16 state;
 963         int result;
 964
 965         if (enable)
 966                 state = BREAK_ON;
 967         else
 968                 state = BREAK_OFF;
 969
 970         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
 971                         state == BREAK_OFF ? "off" : "on");
 972
 973         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 974                                  BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 975                                  0, NULL, 0, 100);
 976         if (result)
 977                 dev_err(&port->dev, "error sending break = %d\n", result);
 978 }
 979
 980 static void pl2303_break_ctl(struct tty_struct *tty, int state)
 981 {
 982         struct usb_serial_port *port = tty->driver_data;
 983
 984         pl2303_set_break(port, state);
 985 }
 986
 987 static void pl2303_update_line_status(struct usb_serial_port *port,
 988                                       unsigned char *data,
 989                                       unsigned int actual_length)
 990 {
 991         struct usb_serial *serial = port->serial;
 992         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 993         struct pl2303_private *priv = usb_get_serial_port_data(port);
 994         struct tty_struct *tty;
 995         unsigned long flags;
 996         unsigned int status_idx = UART_STATE_INDEX;
 997         u8 status;
 998         u8 delta;
 999
1000         if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
1001                 status_idx = 0;
1002
1003         if (actual_length < status_idx + 1)
1004                 return;
1005
1006         status = data[status_idx];
1007
1008         /* Save off the uart status for others to look at */
1009         spin_lock_irqsave(&priv->lock, flags);
1010         delta = priv->line_status ^ status;
1011         priv->line_status = status;
1012         spin_unlock_irqrestore(&priv->lock, flags);
1013
1014         if (status & UART_BREAK_ERROR)
1015                 usb_serial_handle_break(port);
1016
1017         if (delta & UART_STATE_MSR_MASK) {
1018                 if (delta & UART_CTS)
1019                         port->icount.cts++;
1020                 if (delta & UART_DSR)
1021                         port->icount.dsr++;
1022                 if (delta & UART_RING)
1023                         port->icount.rng++;
1024                 if (delta & UART_DCD) {
1025                         port->icount.dcd++;
1026                         tty = tty_port_tty_get(&port->port);
1027                         if (tty) {
1028                                 usb_serial_handle_dcd_change(port, tty,
1029                                                         status & UART_DCD);
1030                                 tty_kref_put(tty);
1031                         }
1032                 }
1033
1034                 wake_up_interruptible(&port->port.delta_msr_wait);
1035         }
1036 }
1037
1038 static void pl2303_read_int_callback(struct urb *urb)
1039 {
1040         struct usb_serial_port *port =  urb->context;
1041         unsigned char *data = urb->transfer_buffer;
1042         unsigned int actual_length = urb->actual_length;
1043         int status = urb->status;
1044         int retval;
1045
1046         switch (status) {
1047         case 0:
1048                 /* success */
1049                 break;
1050         case -ECONNRESET:
1051         case -ENOENT:
1052         case -ESHUTDOWN:
1053                 /* this urb is terminated, clean up */
1054                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
1055                         __func__, status);
1056                 return;
1057         default:
1058                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
1059                         __func__, status);
1060                 goto exit;
1061         }
1062
1063         usb_serial_debug_data(&port->dev, __func__,
1064                               urb->actual_length, urb->transfer_buffer);
1065
1066         pl2303_update_line_status(port, data, actual_length);
1067
1068 exit:
1069         retval = usb_submit_urb(urb, GFP_ATOMIC);
1070         if (retval) {
1071                 dev_err(&port->dev,
1072                         "%s - usb_submit_urb failed with result %d\n",
1073                         __func__, retval);
1074         }
1075 }
1076
1077 static void pl2303_process_read_urb(struct urb *urb)
1078 {
1079         struct usb_serial_port *port = urb->context;
1080         struct pl2303_private *priv = usb_get_serial_port_data(port);
1081         unsigned char *data = urb->transfer_buffer;
1082         char tty_flag = TTY_NORMAL;
1083         unsigned long flags;
1084         u8 line_status;
1085         int i;
1086
1087         /* update line status */
1088         spin_lock_irqsave(&priv->lock, flags);
1089         line_status = priv->line_status;
1090         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
1091         spin_unlock_irqrestore(&priv->lock, flags);
1092
1093         if (!urb->actual_length)
1094                 return;
1095
1096         /*
1097          * Break takes precedence over parity, which takes precedence over
1098          * framing errors.
1099          */
1100         if (line_status & UART_BREAK_ERROR)
1101                 tty_flag = TTY_BREAK;
1102         else if (line_status & UART_PARITY_ERROR)
1103                 tty_flag = TTY_PARITY;
1104         else if (line_status & UART_FRAME_ERROR)
1105                 tty_flag = TTY_FRAME;
1106
1107         if (tty_flag != TTY_NORMAL)
1108                 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
1109                                                                 tty_flag);
1110         /* overrun is special, not associated with a char */
1111         if (line_status & UART_OVERRUN_ERROR)
1112                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1113
1114         if (port->sysrq) {
1115                 for (i = 0; i < urb->actual_length; ++i)
1116                         if (!usb_serial_handle_sysrq_char(port, data[i]))
1117                                 tty_insert_flip_char(&port->port, data[i],
1118                                                 tty_flag);
1119         } else {
1120                 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
1121                                                         urb->actual_length);
1122         }
1123
1124         tty_flip_buffer_push(&port->port);
1125 }
1126
1127 static struct usb_serial_driver pl2303_device = {
1128         .driver = {
1129                 .owner =        THIS_MODULE,
1130                 .name =         "pl2303",
1131         },
1132         .id_table =             id_table,
1133         .num_bulk_in =          1,
1134         .num_bulk_out =         1,
1135         .num_interrupt_in =     0,      /* see pl2303_calc_num_ports */
1136         .bulk_in_size =         256,
1137         .bulk_out_size =        256,
1138         .open =                 pl2303_open,
1139         .close =                pl2303_close,
1140         .dtr_rts =              pl2303_dtr_rts,
1141         .carrier_raised =       pl2303_carrier_raised,
1142         .get_serial =           pl2303_get_serial,
1143         .break_ctl =            pl2303_break_ctl,
1144         .set_termios =          pl2303_set_termios,
1145         .tiocmget =             pl2303_tiocmget,
1146         .tiocmset =             pl2303_tiocmset,
1147         .tiocmiwait =           usb_serial_generic_tiocmiwait,
1148         .process_read_urb =     pl2303_process_read_urb,
1149         .read_int_callback =    pl2303_read_int_callback,
1150         .probe =                pl2303_probe,
1151         .calc_num_ports =       pl2303_calc_num_ports,
1152         .attach =               pl2303_startup,
1153         .release =              pl2303_release,
1154         .port_probe =           pl2303_port_probe,
1155         .port_remove =          pl2303_port_remove,
1156 };
1157
1158 static struct usb_serial_driver * const serial_drivers[] = {
1159         &pl2303_device, NULL
1160 };
1161
1162 module_usb_serial_driver(serial_drivers, id_table);
1163
1164 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
1165 MODULE_LICENSE("GPL v2");