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_LD960_PRODUCT_ID) },
 103         { USB_DEVICE(HP_VENDOR_ID, HP_LD960TA_PRODUCT_ID) },
 104         { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
 105         { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
 106         { USB_DEVICE(HP_VENDOR_ID, HP_LM920_PRODUCT_ID) },
 107         { USB_DEVICE(HP_VENDOR_ID, HP_LM940_PRODUCT_ID) },
 108         { USB_DEVICE(HP_VENDOR_ID, HP_TD620_PRODUCT_ID) },
 109         { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
 110         { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
 111         { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
 112         { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
 113         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
 114         { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
 115         { USB_DEVICE(AT_VENDOR_ID, AT_VTKIT3_PRODUCT_ID) },
 116         { }                                     /* Terminating entry */
 117 };
 118
 119 MODULE_DEVICE_TABLE(usb, id_table);
 120
 121 #define SET_LINE_REQUEST_TYPE           0x21
 122 #define SET_LINE_REQUEST                0x20
 123
 124 #define SET_CONTROL_REQUEST_TYPE        0x21
 125 #define SET_CONTROL_REQUEST             0x22
 126 #define CONTROL_DTR                     0x01
 127 #define CONTROL_RTS                     0x02
 128
 129 #define BREAK_REQUEST_TYPE              0x21
 130 #define BREAK_REQUEST                   0x23
 131 #define BREAK_ON                        0xffff
 132 #define BREAK_OFF                       0x0000
 133
 134 #define GET_LINE_REQUEST_TYPE           0xa1
 135 #define GET_LINE_REQUEST                0x21
 136
 137 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 138 #define VENDOR_WRITE_REQUEST            0x01
 139 #define VENDOR_WRITE_NREQUEST           0x80
 140
 141 #define VENDOR_READ_REQUEST_TYPE        0xc0
 142 #define VENDOR_READ_REQUEST             0x01
 143 #define VENDOR_READ_NREQUEST            0x81
 144
 145 #define UART_STATE_INDEX                8
 146 #define UART_STATE_MSR_MASK             0x8b
 147 #define UART_STATE_TRANSIENT_MASK       0x74
 148 #define UART_DCD                        0x01
 149 #define UART_DSR                        0x02
 150 #define UART_BREAK_ERROR                0x04
 151 #define UART_RING                       0x08
 152 #define UART_FRAME_ERROR                0x10
 153 #define UART_PARITY_ERROR               0x20
 154 #define UART_OVERRUN_ERROR              0x40
 155 #define UART_CTS                        0x80
 156
 157 #define PL2303_FLOWCTRL_MASK            0xf0
 158
 159 #define PL2303_READ_TYPE_HX_STATUS      0x8080
 160
 161 #define PL2303_HXN_RESET_REG            0x07
 162 #define PL2303_HXN_RESET_UPSTREAM_PIPE  0x02
 163 #define PL2303_HXN_RESET_DOWNSTREAM_PIPE        0x01
 164
 165 #define PL2303_HXN_FLOWCTRL_REG         0x0a
 166 #define PL2303_HXN_FLOWCTRL_MASK        0x1c
 167 #define PL2303_HXN_FLOWCTRL_NONE        0x1c
 168 #define PL2303_HXN_FLOWCTRL_RTS_CTS     0x18
 169 #define PL2303_HXN_FLOWCTRL_XON_XOFF    0x0c
 170
 171 static void pl2303_set_break(struct usb_serial_port *port, bool enable);
 172
 173 enum pl2303_type {
 174         TYPE_01,        /* Type 0 and 1 (difference unknown) */
 175         TYPE_HX,        /* HX version of the pl2303 chip */
 176         TYPE_HXN,       /* HXN version of the pl2303 chip */
 177         TYPE_COUNT
 178 };
 179
 180 struct pl2303_type_data {
 181         speed_t max_baud_rate;
 182         unsigned long quirks;
 183         unsigned int no_autoxonxoff:1;
 184 };
 185
 186 struct pl2303_serial_private {
 187         const struct pl2303_type_data *type;
 188         unsigned long quirks;
 189 };
 190
 191 struct pl2303_private {
 192         spinlock_t lock;
 193         u8 line_control;
 194         u8 line_status;
 195
 196         u8 line_settings[7];
 197 };
 198
 199 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
 200         [TYPE_01] = {
 201                 .max_baud_rate          = 1228800,
 202                 .quirks                 = PL2303_QUIRK_LEGACY,
 203                 .no_autoxonxoff         = true,
 204         },
 205         [TYPE_HX] = {
 206                 .max_baud_rate          = 12000000,
 207         },
 208         [TYPE_HXN] = {
 209                 .max_baud_rate          = 12000000,
 210         },
 211 };
 212
 213 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
 214                                                         unsigned char buf[1])
 215 {
 216         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 217         struct device *dev = &serial->interface->dev;
 218         u8 request;
 219         int res;
 220
 221         if (spriv->type == &pl2303_type_data[TYPE_HXN])
 222                 request = VENDOR_READ_NREQUEST;
 223         else
 224                 request = VENDOR_READ_REQUEST;
 225
 226         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 227                         request, VENDOR_READ_REQUEST_TYPE,
 228                         value, 0, buf, 1, 100);
 229         if (res != 1) {
 230                 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
 231                                                                 value, res);
 232                 if (res >= 0)
 233                         res = -EIO;
 234
 235                 return res;
 236         }
 237
 238         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
 239
 240         return 0;
 241 }
 242
 243 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
 244 {
 245         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 246         struct device *dev = &serial->interface->dev;
 247         u8 request;
 248         int res;
 249
 250         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
 251
 252         if (spriv->type == &pl2303_type_data[TYPE_HXN])
 253                 request = VENDOR_WRITE_NREQUEST;
 254         else
 255                 request = VENDOR_WRITE_REQUEST;
 256
 257         res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 258                         request, VENDOR_WRITE_REQUEST_TYPE,
 259                         value, index, NULL, 0, 100);
 260         if (res) {
 261                 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
 262                                                                 value, res);
 263                 return res;
 264         }
 265
 266         return 0;
 267 }
 268
 269 static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val)
 270 {
 271         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 272         int ret = 0;
 273         u8 *buf;
 274
 275         buf = kmalloc(1, GFP_KERNEL);
 276         if (!buf)
 277                 return -ENOMEM;
 278
 279         if (spriv->type == &pl2303_type_data[TYPE_HXN])
 280                 ret = pl2303_vendor_read(serial, reg, buf);
 281         else
 282                 ret = pl2303_vendor_read(serial, reg | 0x80, buf);
 283
 284         if (ret)
 285                 goto out_free;
 286
 287         *buf &= ~mask;
 288         *buf |= val & mask;
 289
 290         ret = pl2303_vendor_write(serial, reg, *buf);
 291 out_free:
 292         kfree(buf);
 293
 294         return ret;
 295 }
 296
 297 static int pl2303_probe(struct usb_serial *serial,
 298                                         const struct usb_device_id *id)
 299 {
 300         usb_set_serial_data(serial, (void *)id->driver_info);
 301
 302         return 0;
 303 }
 304
 305 /*
 306  * Use interrupt endpoint from first interface if available.
 307  *
 308  * This is needed due to the looney way its endpoints are set up.
 309  */
 310 static int pl2303_endpoint_hack(struct usb_serial *serial,
 311                                         struct usb_serial_endpoints *epds)
 312 {
 313         struct usb_interface *interface = serial->interface;
 314         struct usb_device *dev = serial->dev;
 315         struct device *ddev = &interface->dev;
 316         struct usb_host_interface *iface_desc;
 317         struct usb_endpoint_descriptor *endpoint;
 318         unsigned int i;
 319
 320         if (interface == dev->actconfig->interface[0])
 321                 return 0;
 322
 323         /* check out the endpoints of the other interface */
 324         iface_desc = dev->actconfig->interface[0]->cur_altsetting;
 325
 326         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 327                 endpoint = &iface_desc->endpoint[i].desc;
 328
 329                 if (!usb_endpoint_is_int_in(endpoint))
 330                         continue;
 331
 332                 dev_dbg(ddev, "found interrupt in on separate interface\n");
 333                 if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
 334                         epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
 335         }
 336
 337         return 0;
 338 }
 339
 340 static int pl2303_calc_num_ports(struct usb_serial *serial,
 341                                         struct usb_serial_endpoints *epds)
 342 {
 343         unsigned long quirks = (unsigned long)usb_get_serial_data(serial);
 344         struct device *dev = &serial->interface->dev;
 345         int ret;
 346
 347         if (quirks & PL2303_QUIRK_ENDPOINT_HACK) {
 348                 ret = pl2303_endpoint_hack(serial, epds);
 349                 if (ret)
 350                         return ret;
 351         }
 352
 353         if (epds->num_interrupt_in < 1) {
 354                 dev_err(dev, "required interrupt-in endpoint missing\n");
 355                 return -ENODEV;
 356         }
 357
 358         return 1;
 359 }
 360
 361 static int pl2303_startup(struct usb_serial *serial)
 362 {
 363         struct pl2303_serial_private *spriv;
 364         enum pl2303_type type = TYPE_01;
 365         unsigned char *buf;
 366         int res;
 367
 368         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
 369         if (!spriv)
 370                 return -ENOMEM;
 371
 372         buf = kmalloc(1, GFP_KERNEL);
 373         if (!buf) {
 374                 kfree(spriv);
 375                 return -ENOMEM;
 376         }
 377
 378         if (serial->dev->descriptor.bDeviceClass == 0x02)
 379                 type = TYPE_01;         /* type 0 */
 380         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 381                 type = TYPE_HX;
 382         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 383                 type = TYPE_01;         /* type 1 */
 384         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 385                 type = TYPE_01;         /* type 1 */
 386         dev_dbg(&serial->interface->dev, "device type: %d\n", type);
 387
 388         if (type == TYPE_HX) {
 389                 res = usb_control_msg(serial->dev,
 390                                 usb_rcvctrlpipe(serial->dev, 0),
 391                                 VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
 392                                 PL2303_READ_TYPE_HX_STATUS, 0, buf, 1, 100);
 393                 if (res != 1)
 394                         type = TYPE_HXN;
 395         }
 396
 397         spriv->type = &pl2303_type_data[type];
 398         spriv->quirks = (unsigned long)usb_get_serial_data(serial);
 399         spriv->quirks |= spriv->type->quirks;
 400
 401         usb_set_serial_data(serial, spriv);
 402
 403         if (type != TYPE_HXN) {
 404                 pl2303_vendor_read(serial, 0x8484, buf);
 405                 pl2303_vendor_write(serial, 0x0404, 0);
 406                 pl2303_vendor_read(serial, 0x8484, buf);
 407                 pl2303_vendor_read(serial, 0x8383, buf);
 408                 pl2303_vendor_read(serial, 0x8484, buf);
 409                 pl2303_vendor_write(serial, 0x0404, 1);
 410                 pl2303_vendor_read(serial, 0x8484, buf);
 411                 pl2303_vendor_read(serial, 0x8383, buf);
 412                 pl2303_vendor_write(serial, 0, 1);
 413                 pl2303_vendor_write(serial, 1, 0);
 414                 if (spriv->quirks & PL2303_QUIRK_LEGACY)
 415                         pl2303_vendor_write(serial, 2, 0x24);
 416                 else
 417                         pl2303_vendor_write(serial, 2, 0x44);
 418         }
 419
 420         kfree(buf);
 421
 422         return 0;
 423 }
 424
 425 static void pl2303_release(struct usb_serial *serial)
 426 {
 427         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 428
 429         kfree(spriv);
 430 }
 431
 432 static int pl2303_port_probe(struct usb_serial_port *port)
 433 {
 434         struct pl2303_private *priv;
 435
 436         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 437         if (!priv)
 438                 return -ENOMEM;
 439
 440         spin_lock_init(&priv->lock);
 441
 442         usb_set_serial_port_data(port, priv);
 443
 444         port->port.drain_delay = 256;
 445
 446         return 0;
 447 }
 448
 449 static int pl2303_port_remove(struct usb_serial_port *port)
 450 {
 451         struct pl2303_private *priv = usb_get_serial_port_data(port);
 452
 453         kfree(priv);
 454
 455         return 0;
 456 }
 457
 458 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
 459 {
 460         struct usb_device *dev = port->serial->dev;
 461         int retval;
 462
 463         dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
 464
 465         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 466                                  SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 467                                  value, 0, NULL, 0, 100);
 468         if (retval)
 469                 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
 470
 471         return retval;
 472 }
 473
 474 /*
 475  * Returns the nearest supported baud rate that can be set directly without
 476  * using divisors.
 477  */
 478 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
 479 {
 480         static const speed_t baud_sup[] = {
 481                 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
 482                 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
 483                 614400, 921600, 1228800, 2457600, 3000000, 6000000
 484         };
 485
 486         unsigned i;
 487
 488         for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
 489                 if (baud_sup[i] > baud)
 490                         break;
 491         }
 492
 493         if (i == ARRAY_SIZE(baud_sup))
 494                 baud = baud_sup[i - 1];
 495         else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
 496                 baud = baud_sup[i - 1];
 497         else
 498                 baud = baud_sup[i];
 499
 500         return baud;
 501 }
 502
 503 /*
 504  * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
 505  *       use 9600 baud.
 506  */
 507 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
 508                                                                 speed_t baud)
 509 {
 510         put_unaligned_le32(baud, buf);
 511
 512         return baud;
 513 }
 514
 515 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
 516                                                                 speed_t baud)
 517 {
 518         unsigned int baseline, mantissa, exponent;
 519
 520         /*
 521          * Apparently the formula is:
 522          *   baudrate = 12M * 32 / (mantissa * 4^exponent)
 523          * where
 524          *   mantissa = buf[8:0]
 525          *   exponent = buf[11:9]
 526          */
 527         baseline = 12000000 * 32;
 528         mantissa = baseline / baud;
 529         if (mantissa == 0)
 530                 mantissa = 1;   /* Avoid dividing by zero if baud > 32*12M. */
 531         exponent = 0;
 532         while (mantissa >= 512) {
 533                 if (exponent < 7) {
 534                         mantissa >>= 2; /* divide by 4 */
 535                         exponent++;
 536                 } else {
 537                         /* Exponent is maxed. Trim mantissa and leave. */
 538                         mantissa = 511;
 539                         break;
 540                 }
 541         }
 542
 543         buf[3] = 0x80;
 544         buf[2] = 0;
 545         buf[1] = exponent << 1 | mantissa >> 8;
 546         buf[0] = mantissa & 0xff;
 547
 548         /* Calculate and return the exact baud rate. */
 549         baud = (baseline / mantissa) >> (exponent << 1);
 550
 551         return baud;
 552 }
 553
 554 static void pl2303_encode_baud_rate(struct tty_struct *tty,
 555                                         struct usb_serial_port *port,
 556                                         u8 buf[4])
 557 {
 558         struct usb_serial *serial = port->serial;
 559         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 560         speed_t baud_sup;
 561         speed_t baud;
 562
 563         baud = tty_get_baud_rate(tty);
 564         dev_dbg(&port->dev, "baud requested = %u\n", baud);
 565         if (!baud)
 566                 return;
 567
 568         if (spriv->type->max_baud_rate)
 569                 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
 570         /*
 571          * Use direct method for supported baud rates, otherwise use divisors.
 572          */
 573         baud_sup = pl2303_get_supported_baud_rate(baud);
 574
 575         if (baud == baud_sup)
 576                 baud = pl2303_encode_baud_rate_direct(buf, baud);
 577         else
 578                 baud = pl2303_encode_baud_rate_divisor(buf, baud);
 579
 580         /* Save resulting baud rate */
 581         tty_encode_baud_rate(tty, baud, baud);
 582         dev_dbg(&port->dev, "baud set = %u\n", baud);
 583 }
 584
 585 static int pl2303_get_line_request(struct usb_serial_port *port,
 586                                                         unsigned char buf[7])
 587 {
 588         struct usb_device *udev = port->serial->dev;
 589         int ret;
 590
 591         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 592                                 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 593                                 0, 0, buf, 7, 100);
 594         if (ret != 7) {
 595                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 596
 597                 if (ret >= 0)
 598                         ret = -EIO;
 599
 600                 return ret;
 601         }
 602
 603         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 604
 605         return 0;
 606 }
 607
 608 static int pl2303_set_line_request(struct usb_serial_port *port,
 609                                                         unsigned char buf[7])
 610 {
 611         struct usb_device *udev = port->serial->dev;
 612         int ret;
 613
 614         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 615                                 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 616                                 0, 0, buf, 7, 100);
 617         if (ret < 0) {
 618                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 619                 return ret;
 620         }
 621
 622         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 623
 624         return 0;
 625 }
 626
 627 static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b)
 628 {
 629         bool ixon_change;
 630
 631         ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) ||
 632                         a->c_cc[VSTART] != b->c_cc[VSTART] ||
 633                         a->c_cc[VSTOP] != b->c_cc[VSTOP];
 634
 635         return tty_termios_hw_change(a, b) || ixon_change;
 636 }
 637
 638 static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type)
 639 {
 640         if (!I_IXON(tty) || I_IXANY(tty))
 641                 return false;
 642
 643         if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13)
 644                 return false;
 645
 646         if (type->no_autoxonxoff)
 647                 return false;
 648
 649         return true;
 650 }
 651
 652 static void pl2303_set_termios(struct tty_struct *tty,
 653                 struct usb_serial_port *port, struct ktermios *old_termios)
 654 {
 655         struct usb_serial *serial = port->serial;
 656         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 657         struct pl2303_private *priv = usb_get_serial_port_data(port);
 658         unsigned long flags;
 659         unsigned char *buf;
 660         int ret;
 661         u8 control;
 662
 663         if (old_termios && !pl2303_termios_change(&tty->termios, old_termios))
 664                 return;
 665
 666         buf = kzalloc(7, GFP_KERNEL);
 667         if (!buf) {
 668                 /* Report back no change occurred */
 669                 if (old_termios)
 670                         tty->termios = *old_termios;
 671                 return;
 672         }
 673
 674         pl2303_get_line_request(port, buf);
 675
 676         switch (C_CSIZE(tty)) {
 677         case CS5:
 678                 buf[6] = 5;
 679                 break;
 680         case CS6:
 681                 buf[6] = 6;
 682                 break;
 683         case CS7:
 684                 buf[6] = 7;
 685                 break;
 686         default:
 687         case CS8:
 688                 buf[6] = 8;
 689         }
 690         dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
 691
 692         /* For reference buf[0]:buf[3] baud rate value */
 693         pl2303_encode_baud_rate(tty, port, &buf[0]);
 694
 695         /* For reference buf[4]=0 is 1 stop bits */
 696         /* For reference buf[4]=1 is 1.5 stop bits */
 697         /* For reference buf[4]=2 is 2 stop bits */
 698         if (C_CSTOPB(tty)) {
 699                 /*
 700                  * NOTE: Comply with "real" UARTs / RS232:
 701                  *       use 1.5 instead of 2 stop bits with 5 data bits
 702                  */
 703                 if (C_CSIZE(tty) == CS5) {
 704                         buf[4] = 1;
 705                         dev_dbg(&port->dev, "stop bits = 1.5\n");
 706                 } else {
 707                         buf[4] = 2;
 708                         dev_dbg(&port->dev, "stop bits = 2\n");
 709                 }
 710         } else {
 711                 buf[4] = 0;
 712                 dev_dbg(&port->dev, "stop bits = 1\n");
 713         }
 714
 715         if (C_PARENB(tty)) {
 716                 /* For reference buf[5]=0 is none parity */
 717                 /* For reference buf[5]=1 is odd parity */
 718                 /* For reference buf[5]=2 is even parity */
 719                 /* For reference buf[5]=3 is mark parity */
 720                 /* For reference buf[5]=4 is space parity */
 721                 if (C_PARODD(tty)) {
 722                         if (C_CMSPAR(tty)) {
 723                                 buf[5] = 3;
 724                                 dev_dbg(&port->dev, "parity = mark\n");
 725                         } else {
 726                                 buf[5] = 1;
 727                                 dev_dbg(&port->dev, "parity = odd\n");
 728                         }
 729                 } else {
 730                         if (C_CMSPAR(tty)) {
 731                                 buf[5] = 4;
 732                                 dev_dbg(&port->dev, "parity = space\n");
 733                         } else {
 734                                 buf[5] = 2;
 735                                 dev_dbg(&port->dev, "parity = even\n");
 736                         }
 737                 }
 738         } else {
 739                 buf[5] = 0;
 740                 dev_dbg(&port->dev, "parity = none\n");
 741         }
 742
 743         /*
 744          * Some PL2303 are known to lose bytes if you change serial settings
 745          * even to the same values as before. Thus we actually need to filter
 746          * in this specific case.
 747          *
 748          * Note that the tty_termios_hw_change check above is not sufficient
 749          * as a previously requested baud rate may differ from the one
 750          * actually used (and stored in old_termios).
 751          *
 752          * NOTE: No additional locking needed for line_settings as it is
 753          *       only used in set_termios, which is serialised against itself.
 754          */
 755         if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
 756                 ret = pl2303_set_line_request(port, buf);
 757                 if (!ret)
 758                         memcpy(priv->line_settings, buf, 7);
 759         }
 760
 761         /* change control lines if we are switching to or from B0 */
 762         spin_lock_irqsave(&priv->lock, flags);
 763         control = priv->line_control;
 764         if (C_BAUD(tty) == B0)
 765                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 766         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
 767                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 768         if (control != priv->line_control) {
 769                 control = priv->line_control;
 770                 spin_unlock_irqrestore(&priv->lock, flags);
 771                 pl2303_set_control_lines(port, control);
 772         } else {
 773                 spin_unlock_irqrestore(&priv->lock, flags);
 774         }
 775
 776         if (C_CRTSCTS(tty)) {
 777                 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 778                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40);
 779                 } else if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 780                         pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 781                                         PL2303_HXN_FLOWCTRL_MASK,
 782                                         PL2303_HXN_FLOWCTRL_RTS_CTS);
 783                 } else {
 784                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60);
 785                 }
 786         } else if (pl2303_enable_xonxoff(tty, spriv->type)) {
 787                 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 788                         pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 789                                         PL2303_HXN_FLOWCTRL_MASK,
 790                                         PL2303_HXN_FLOWCTRL_XON_XOFF);
 791                 } else {
 792                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0);
 793                 }
 794         } else {
 795                 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 796                         pl2303_update_reg(serial, PL2303_HXN_FLOWCTRL_REG,
 797                                         PL2303_HXN_FLOWCTRL_MASK,
 798                                         PL2303_HXN_FLOWCTRL_NONE);
 799                 } else {
 800                         pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0);
 801                 }
 802         }
 803
 804         kfree(buf);
 805 }
 806
 807 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
 808 {
 809         struct pl2303_private *priv = usb_get_serial_port_data(port);
 810         unsigned long flags;
 811         u8 control;
 812
 813         spin_lock_irqsave(&priv->lock, flags);
 814         if (on)
 815                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 816         else
 817                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 818         control = priv->line_control;
 819         spin_unlock_irqrestore(&priv->lock, flags);
 820
 821         pl2303_set_control_lines(port, control);
 822 }
 823
 824 static void pl2303_close(struct usb_serial_port *port)
 825 {
 826         usb_serial_generic_close(port);
 827         usb_kill_urb(port->interrupt_in_urb);
 828         pl2303_set_break(port, false);
 829 }
 830
 831 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
 832 {
 833         struct usb_serial *serial = port->serial;
 834         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 835         int result;
 836
 837         if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 838                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 839                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 840         } else {
 841                 /* reset upstream data pipes */
 842                 if (spriv->type == &pl2303_type_data[TYPE_HXN]) {
 843                         pl2303_vendor_write(serial, PL2303_HXN_RESET_REG,
 844                                         PL2303_HXN_RESET_UPSTREAM_PIPE |
 845                                         PL2303_HXN_RESET_DOWNSTREAM_PIPE);
 846                 } else {
 847                         pl2303_vendor_write(serial, 8, 0);
 848                         pl2303_vendor_write(serial, 9, 0);
 849                 }
 850         }
 851
 852         /* Setup termios */
 853         if (tty)
 854                 pl2303_set_termios(tty, port, NULL);
 855
 856         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 857         if (result) {
 858                 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
 859                         result);
 860                 return result;
 861         }
 862
 863         result = usb_serial_generic_open(tty, port);
 864         if (result) {
 865                 usb_kill_urb(port->interrupt_in_urb);
 866                 return result;
 867         }
 868
 869         return 0;
 870 }
 871
 872 static int pl2303_tiocmset(struct tty_struct *tty,
 873                            unsigned int set, unsigned int clear)
 874 {
 875         struct usb_serial_port *port = tty->driver_data;
 876         struct pl2303_private *priv = usb_get_serial_port_data(port);
 877         unsigned long flags;
 878         u8 control;
 879         int ret;
 880
 881         spin_lock_irqsave(&priv->lock, flags);
 882         if (set & TIOCM_RTS)
 883                 priv->line_control |= CONTROL_RTS;
 884         if (set & TIOCM_DTR)
 885                 priv->line_control |= CONTROL_DTR;
 886         if (clear & TIOCM_RTS)
 887                 priv->line_control &= ~CONTROL_RTS;
 888         if (clear & TIOCM_DTR)
 889                 priv->line_control &= ~CONTROL_DTR;
 890         control = priv->line_control;
 891         spin_unlock_irqrestore(&priv->lock, flags);
 892
 893         ret = pl2303_set_control_lines(port, control);
 894         if (ret)
 895                 return usb_translate_errors(ret);
 896
 897         return 0;
 898 }
 899
 900 static int pl2303_tiocmget(struct tty_struct *tty)
 901 {
 902         struct usb_serial_port *port = tty->driver_data;
 903         struct pl2303_private *priv = usb_get_serial_port_data(port);
 904         unsigned long flags;
 905         unsigned int mcr;
 906         unsigned int status;
 907         unsigned int result;
 908
 909         spin_lock_irqsave(&priv->lock, flags);
 910         mcr = priv->line_control;
 911         status = priv->line_status;
 912         spin_unlock_irqrestore(&priv->lock, flags);
 913
 914         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 915                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 916                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 917                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 918                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 919                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 920
 921         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
 922
 923         return result;
 924 }
 925
 926 static int pl2303_carrier_raised(struct usb_serial_port *port)
 927 {
 928         struct pl2303_private *priv = usb_get_serial_port_data(port);
 929
 930         if (priv->line_status & UART_DCD)
 931                 return 1;
 932
 933         return 0;
 934 }
 935
 936 static int pl2303_get_serial(struct tty_struct *tty,
 937                         struct serial_struct *ss)
 938 {
 939         struct usb_serial_port *port = tty->driver_data;
 940
 941         ss->type = PORT_16654;
 942         ss->line = port->minor;
 943         ss->port = port->port_number;
 944         ss->baud_base = 460800;
 945         return 0;
 946 }
 947
 948 static void pl2303_set_break(struct usb_serial_port *port, bool enable)
 949 {
 950         struct usb_serial *serial = port->serial;
 951         u16 state;
 952         int result;
 953
 954         if (enable)
 955                 state = BREAK_ON;
 956         else
 957                 state = BREAK_OFF;
 958
 959         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
 960                         state == BREAK_OFF ? "off" : "on");
 961
 962         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 963                                  BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 964                                  0, NULL, 0, 100);
 965         if (result)
 966                 dev_err(&port->dev, "error sending break = %d\n", result);
 967 }
 968
 969 static void pl2303_break_ctl(struct tty_struct *tty, int state)
 970 {
 971         struct usb_serial_port *port = tty->driver_data;
 972
 973         pl2303_set_break(port, state);
 974 }
 975
 976 static void pl2303_update_line_status(struct usb_serial_port *port,
 977                                       unsigned char *data,
 978                                       unsigned int actual_length)
 979 {
 980         struct usb_serial *serial = port->serial;
 981         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 982         struct pl2303_private *priv = usb_get_serial_port_data(port);
 983         struct tty_struct *tty;
 984         unsigned long flags;
 985         unsigned int status_idx = UART_STATE_INDEX;
 986         u8 status;
 987         u8 delta;
 988
 989         if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
 990                 status_idx = 0;
 991
 992         if (actual_length < status_idx + 1)
 993                 return;
 994
 995         status = data[status_idx];
 996
 997         /* Save off the uart status for others to look at */
 998         spin_lock_irqsave(&priv->lock, flags);
 999         delta = priv->line_status ^ status;
1000         priv->line_status = status;
1001         spin_unlock_irqrestore(&priv->lock, flags);
1002
1003         if (status & UART_BREAK_ERROR)
1004                 usb_serial_handle_break(port);
1005
1006         if (delta & UART_STATE_MSR_MASK) {
1007                 if (delta & UART_CTS)
1008                         port->icount.cts++;
1009                 if (delta & UART_DSR)
1010                         port->icount.dsr++;
1011                 if (delta & UART_RING)
1012                         port->icount.rng++;
1013                 if (delta & UART_DCD) {
1014                         port->icount.dcd++;
1015                         tty = tty_port_tty_get(&port->port);
1016                         if (tty) {
1017                                 usb_serial_handle_dcd_change(port, tty,
1018                                                         status & UART_DCD);
1019                                 tty_kref_put(tty);
1020                         }
1021                 }
1022
1023                 wake_up_interruptible(&port->port.delta_msr_wait);
1024         }
1025 }
1026
1027 static void pl2303_read_int_callback(struct urb *urb)
1028 {
1029         struct usb_serial_port *port =  urb->context;
1030         unsigned char *data = urb->transfer_buffer;
1031         unsigned int actual_length = urb->actual_length;
1032         int status = urb->status;
1033         int retval;
1034
1035         switch (status) {
1036         case 0:
1037                 /* success */
1038                 break;
1039         case -ECONNRESET:
1040         case -ENOENT:
1041         case -ESHUTDOWN:
1042                 /* this urb is terminated, clean up */
1043                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
1044                         __func__, status);
1045                 return;
1046         default:
1047                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
1048                         __func__, status);
1049                 goto exit;
1050         }
1051
1052         usb_serial_debug_data(&port->dev, __func__,
1053                               urb->actual_length, urb->transfer_buffer);
1054
1055         pl2303_update_line_status(port, data, actual_length);
1056
1057 exit:
1058         retval = usb_submit_urb(urb, GFP_ATOMIC);
1059         if (retval) {
1060                 dev_err(&port->dev,
1061                         "%s - usb_submit_urb failed with result %d\n",
1062                         __func__, retval);
1063         }
1064 }
1065
1066 static void pl2303_process_read_urb(struct urb *urb)
1067 {
1068         struct usb_serial_port *port = urb->context;
1069         struct pl2303_private *priv = usb_get_serial_port_data(port);
1070         unsigned char *data = urb->transfer_buffer;
1071         char tty_flag = TTY_NORMAL;
1072         unsigned long flags;
1073         u8 line_status;
1074         int i;
1075
1076         /* update line status */
1077         spin_lock_irqsave(&priv->lock, flags);
1078         line_status = priv->line_status;
1079         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
1080         spin_unlock_irqrestore(&priv->lock, flags);
1081
1082         if (!urb->actual_length)
1083                 return;
1084
1085         /*
1086          * Break takes precedence over parity, which takes precedence over
1087          * framing errors.
1088          */
1089         if (line_status & UART_BREAK_ERROR)
1090                 tty_flag = TTY_BREAK;
1091         else if (line_status & UART_PARITY_ERROR)
1092                 tty_flag = TTY_PARITY;
1093         else if (line_status & UART_FRAME_ERROR)
1094                 tty_flag = TTY_FRAME;
1095
1096         if (tty_flag != TTY_NORMAL)
1097                 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
1098                                                                 tty_flag);
1099         /* overrun is special, not associated with a char */
1100         if (line_status & UART_OVERRUN_ERROR)
1101                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1102
1103         if (port->port.console && port->sysrq) {
1104                 for (i = 0; i < urb->actual_length; ++i)
1105                         if (!usb_serial_handle_sysrq_char(port, data[i]))
1106                                 tty_insert_flip_char(&port->port, data[i],
1107                                                 tty_flag);
1108         } else {
1109                 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
1110                                                         urb->actual_length);
1111         }
1112
1113         tty_flip_buffer_push(&port->port);
1114 }
1115
1116 static struct usb_serial_driver pl2303_device = {
1117         .driver = {
1118                 .owner =        THIS_MODULE,
1119                 .name =         "pl2303",
1120         },
1121         .id_table =             id_table,
1122         .num_bulk_in =          1,
1123         .num_bulk_out =         1,
1124         .num_interrupt_in =     0,      /* see pl2303_calc_num_ports */
1125         .bulk_in_size =         256,
1126         .bulk_out_size =        256,
1127         .open =                 pl2303_open,
1128         .close =                pl2303_close,
1129         .dtr_rts =              pl2303_dtr_rts,
1130         .carrier_raised =       pl2303_carrier_raised,
1131         .get_serial =           pl2303_get_serial,
1132         .break_ctl =            pl2303_break_ctl,
1133         .set_termios =          pl2303_set_termios,
1134         .tiocmget =             pl2303_tiocmget,
1135         .tiocmset =             pl2303_tiocmset,
1136         .tiocmiwait =           usb_serial_generic_tiocmiwait,
1137         .process_read_urb =     pl2303_process_read_urb,
1138         .read_int_callback =    pl2303_read_int_callback,
1139         .probe =                pl2303_probe,
1140         .calc_num_ports =       pl2303_calc_num_ports,
1141         .attach =               pl2303_startup,
1142         .release =              pl2303_release,
1143         .port_probe =           pl2303_port_probe,
1144         .port_remove =          pl2303_port_remove,
1145 };
1146
1147 static struct usb_serial_driver * const serial_drivers[] = {
1148         &pl2303_device, NULL
1149 };
1150
1151 module_usb_serial_driver(serial_drivers, id_table);
1152
1153 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
1154 MODULE_LICENSE("GPL v2");