drivers/usb/serial/pl2303.c

   1 /*
   2  * Prolific PL2303 USB to serial adaptor driver
   3  *
   4  * Copyright (C) 2001-2007 Greg Kroah-Hartman ([email protected])
   5  * Copyright (C) 2003 IBM Corp.
   6  *
   7  * Original driver for 2.2.x by anonymous
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License version
  11  *      2 as published by the Free Software Foundation.
  12  *
  13  * See Documentation/usb/usb-serial.txt for more information on using this
  14  * driver
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/errno.h>
  19 #include <linux/slab.h>
  20 #include <linux/tty.h>
  21 #include <linux/tty_driver.h>
  22 #include <linux/tty_flip.h>
  23 #include <linux/serial.h>
  24 #include <linux/module.h>
  25 #include <linux/moduleparam.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/uaccess.h>
  28 #include <linux/usb.h>
  29 #include <linux/usb/serial.h>
  30 #include <asm/unaligned.h>
  31 #include "pl2303.h"
  32
  33
  34 #define PL2303_QUIRK_UART_STATE_IDX0            BIT(0)
  35 #define PL2303_QUIRK_LEGACY                     BIT(1)
  36
  37 static const struct usb_device_id id_table[] = {
  38         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
  39         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  40         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
  41         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
  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(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  49         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
  50         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
  51         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  52         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  53         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  54         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  55         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
  56         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  57         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  58         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  59         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  60         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  61         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  62         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  63         { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
  64         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
  65                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  66         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
  67                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  68         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
  69                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  70         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) },
  71         { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
  72         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  73         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
  74         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
  75         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
  76         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
  77         { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
  78         { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
  79         { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
  80         { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
  81         { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
  82         { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
  83         { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
  84         { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
  85         { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
  86         { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
  87         { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
  88         { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
  89         { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
  90         { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
  91         { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
  92         { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
  93         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
  94         { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
  95         { }                                     /* Terminating entry */
  96 };
  97
  98 MODULE_DEVICE_TABLE(usb, id_table);
  99
 100 #define SET_LINE_REQUEST_TYPE           0x21
 101 #define SET_LINE_REQUEST                0x20
 102
 103 #define SET_CONTROL_REQUEST_TYPE        0x21
 104 #define SET_CONTROL_REQUEST             0x22
 105 #define CONTROL_DTR                     0x01
 106 #define CONTROL_RTS                     0x02
 107
 108 #define BREAK_REQUEST_TYPE              0x21
 109 #define BREAK_REQUEST                   0x23
 110 #define BREAK_ON                        0xffff
 111 #define BREAK_OFF                       0x0000
 112
 113 #define GET_LINE_REQUEST_TYPE           0xa1
 114 #define GET_LINE_REQUEST                0x21
 115
 116 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 117 #define VENDOR_WRITE_REQUEST            0x01
 118
 119 #define VENDOR_READ_REQUEST_TYPE        0xc0
 120 #define VENDOR_READ_REQUEST             0x01
 121
 122 #define UART_STATE_INDEX                8
 123 #define UART_STATE_MSR_MASK             0x8b
 124 #define UART_STATE_TRANSIENT_MASK       0x74
 125 #define UART_DCD                        0x01
 126 #define UART_DSR                        0x02
 127 #define UART_BREAK_ERROR                0x04
 128 #define UART_RING                       0x08
 129 #define UART_FRAME_ERROR                0x10
 130 #define UART_PARITY_ERROR               0x20
 131 #define UART_OVERRUN_ERROR              0x40
 132 #define UART_CTS                        0x80
 133
 134
 135 enum pl2303_type {
 136         TYPE_01,        /* Type 0 and 1 (difference unknown) */
 137         TYPE_HX,        /* HX version of the pl2303 chip */
 138         TYPE_COUNT
 139 };
 140
 141 struct pl2303_type_data {
 142         speed_t max_baud_rate;
 143         unsigned long quirks;
 144 };
 145
 146 struct pl2303_serial_private {
 147         const struct pl2303_type_data *type;
 148         unsigned long quirks;
 149 };
 150
 151 struct pl2303_private {
 152         spinlock_t lock;
 153         u8 line_control;
 154         u8 line_status;
 155
 156         u8 line_settings[7];
 157 };
 158
 159 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
 160         [TYPE_01] = {
 161                 .max_baud_rate =        1228800,
 162                 .quirks =               PL2303_QUIRK_LEGACY,
 163         },
 164 };
 165
 166 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
 167                                                         unsigned char buf[1])
 168 {
 169         struct device *dev = &serial->interface->dev;
 170         int res;
 171
 172         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 173                         VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
 174                         value, 0, buf, 1, 100);
 175         if (res != 1) {
 176                 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
 177                                                                 value, res);
 178                 if (res >= 0)
 179                         res = -EIO;
 180
 181                 return res;
 182         }
 183
 184         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
 185
 186         return 0;
 187 }
 188
 189 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
 190 {
 191         struct device *dev = &serial->interface->dev;
 192         int res;
 193
 194         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
 195
 196         res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 197                         VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
 198                         value, index, NULL, 0, 100);
 199         if (res) {
 200                 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
 201                                                                 value, res);
 202                 return res;
 203         }
 204
 205         return 0;
 206 }
 207
 208 static int pl2303_probe(struct usb_serial *serial,
 209                                         const struct usb_device_id *id)
 210 {
 211         usb_set_serial_data(serial, (void *)id->driver_info);
 212
 213         return 0;
 214 }
 215
 216 static int pl2303_startup(struct usb_serial *serial)
 217 {
 218         struct pl2303_serial_private *spriv;
 219         enum pl2303_type type = TYPE_01;
 220         unsigned char *buf;
 221
 222         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
 223         if (!spriv)
 224                 return -ENOMEM;
 225
 226         buf = kmalloc(1, GFP_KERNEL);
 227         if (!buf) {
 228                 kfree(spriv);
 229                 return -ENOMEM;
 230         }
 231
 232         if (serial->dev->descriptor.bDeviceClass == 0x02)
 233                 type = TYPE_01;         /* type 0 */
 234         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 235                 type = TYPE_HX;
 236         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 237                 type = TYPE_01;         /* type 1 */
 238         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 239                 type = TYPE_01;         /* type 1 */
 240         dev_dbg(&serial->interface->dev, "device type: %d\n", type);
 241
 242         spriv->type = &pl2303_type_data[type];
 243         spriv->quirks = (unsigned long)usb_get_serial_data(serial);
 244         spriv->quirks |= spriv->type->quirks;
 245
 246         usb_set_serial_data(serial, spriv);
 247
 248         pl2303_vendor_read(serial, 0x8484, buf);
 249         pl2303_vendor_write(serial, 0x0404, 0);
 250         pl2303_vendor_read(serial, 0x8484, buf);
 251         pl2303_vendor_read(serial, 0x8383, buf);
 252         pl2303_vendor_read(serial, 0x8484, buf);
 253         pl2303_vendor_write(serial, 0x0404, 1);
 254         pl2303_vendor_read(serial, 0x8484, buf);
 255         pl2303_vendor_read(serial, 0x8383, buf);
 256         pl2303_vendor_write(serial, 0, 1);
 257         pl2303_vendor_write(serial, 1, 0);
 258         if (spriv->quirks & PL2303_QUIRK_LEGACY)
 259                 pl2303_vendor_write(serial, 2, 0x24);
 260         else
 261                 pl2303_vendor_write(serial, 2, 0x44);
 262
 263         kfree(buf);
 264
 265         return 0;
 266 }
 267
 268 static void pl2303_release(struct usb_serial *serial)
 269 {
 270         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 271
 272         kfree(spriv);
 273 }
 274
 275 static int pl2303_port_probe(struct usb_serial_port *port)
 276 {
 277         struct pl2303_private *priv;
 278
 279         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 280         if (!priv)
 281                 return -ENOMEM;
 282
 283         spin_lock_init(&priv->lock);
 284
 285         usb_set_serial_port_data(port, priv);
 286
 287         port->port.drain_delay = 256;
 288
 289         return 0;
 290 }
 291
 292 static int pl2303_port_remove(struct usb_serial_port *port)
 293 {
 294         struct pl2303_private *priv = usb_get_serial_port_data(port);
 295
 296         kfree(priv);
 297
 298         return 0;
 299 }
 300
 301 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
 302 {
 303         struct usb_device *dev = port->serial->dev;
 304         int retval;
 305
 306         dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
 307
 308         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 309                                  SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 310                                  value, 0, NULL, 0, 100);
 311         if (retval)
 312                 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
 313
 314         return retval;
 315 }
 316
 317 /*
 318  * Returns the nearest supported baud rate that can be set directly without
 319  * using divisors.
 320  */
 321 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
 322 {
 323         static const speed_t baud_sup[] = {
 324                 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
 325                 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
 326                 614400, 921600, 1228800, 2457600, 3000000, 6000000
 327         };
 328
 329         unsigned i;
 330
 331         for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
 332                 if (baud_sup[i] > baud)
 333                         break;
 334         }
 335
 336         if (i == ARRAY_SIZE(baud_sup))
 337                 baud = baud_sup[i - 1];
 338         else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
 339                 baud = baud_sup[i - 1];
 340         else
 341                 baud = baud_sup[i];
 342
 343         return baud;
 344 }
 345
 346 /*
 347  * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
 348  *       use 9600 baud.
 349  */
 350 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
 351                                                                 speed_t baud)
 352 {
 353         put_unaligned_le32(baud, buf);
 354
 355         return baud;
 356 }
 357
 358 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
 359                                                                 speed_t baud)
 360 {
 361         unsigned int tmp;
 362
 363         /*
 364          * Apparently the formula is:
 365          * baudrate = 12M * 32 / (2^buf[1]) / buf[0]
 366          */
 367         tmp = 12000000 * 32 / baud;
 368         buf[3] = 0x80;
 369         buf[2] = 0;
 370         buf[1] = (tmp >= 256);
 371         while (tmp >= 256) {
 372                 tmp >>= 2;
 373                 buf[1] <<= 1;
 374         }
 375         buf[0] = tmp;
 376
 377         return baud;
 378 }
 379
 380 static void pl2303_encode_baud_rate(struct tty_struct *tty,
 381                                         struct usb_serial_port *port,
 382                                         u8 buf[4])
 383 {
 384         struct usb_serial *serial = port->serial;
 385         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 386         speed_t baud_sup;
 387         speed_t baud;
 388
 389         baud = tty_get_baud_rate(tty);
 390         dev_dbg(&port->dev, "baud requested = %u\n", baud);
 391         if (!baud)
 392                 return;
 393
 394         if (spriv->type->max_baud_rate)
 395                 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
 396         /*
 397          * Set baud rate to nearest supported value.
 398          *
 399          * NOTE: Baud rate 500k can only be set using divisors.
 400          */
 401         baud_sup = pl2303_get_supported_baud_rate(baud);
 402
 403         if (baud == 500000)
 404                 baud = pl2303_encode_baud_rate_divisor(buf, baud);
 405         else
 406                 baud = pl2303_encode_baud_rate_direct(buf, baud_sup);
 407
 408         /* Save resulting baud rate */
 409         tty_encode_baud_rate(tty, baud, baud);
 410         dev_dbg(&port->dev, "baud set = %u\n", baud);
 411 }
 412
 413 static int pl2303_get_line_request(struct usb_serial_port *port,
 414                                                         unsigned char buf[7])
 415 {
 416         struct usb_device *udev = port->serial->dev;
 417         int ret;
 418
 419         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 420                                 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 421                                 0, 0, buf, 7, 100);
 422         if (ret != 7) {
 423                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 424
 425                 if (ret > 0)
 426                         ret = -EIO;
 427
 428                 return ret;
 429         }
 430
 431         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 432
 433         return 0;
 434 }
 435
 436 static int pl2303_set_line_request(struct usb_serial_port *port,
 437                                                         unsigned char buf[7])
 438 {
 439         struct usb_device *udev = port->serial->dev;
 440         int ret;
 441
 442         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 443                                 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 444                                 0, 0, buf, 7, 100);
 445         if (ret != 7) {
 446                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 447
 448                 if (ret > 0)
 449                         ret = -EIO;
 450
 451                 return ret;
 452         }
 453
 454         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 455
 456         return 0;
 457 }
 458
 459 static void pl2303_set_termios(struct tty_struct *tty,
 460                 struct usb_serial_port *port, struct ktermios *old_termios)
 461 {
 462         struct usb_serial *serial = port->serial;
 463         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 464         struct pl2303_private *priv = usb_get_serial_port_data(port);
 465         unsigned long flags;
 466         unsigned char *buf;
 467         int ret;
 468         u8 control;
 469
 470         if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
 471                 return;
 472
 473         buf = kzalloc(7, GFP_KERNEL);
 474         if (!buf) {
 475                 /* Report back no change occurred */
 476                 if (old_termios)
 477                         tty->termios = *old_termios;
 478                 return;
 479         }
 480
 481         pl2303_get_line_request(port, buf);
 482
 483         switch (C_CSIZE(tty)) {
 484         case CS5:
 485                 buf[6] = 5;
 486                 break;
 487         case CS6:
 488                 buf[6] = 6;
 489                 break;
 490         case CS7:
 491                 buf[6] = 7;
 492                 break;
 493         default:
 494         case CS8:
 495                 buf[6] = 8;
 496         }
 497         dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
 498
 499         /* For reference buf[0]:buf[3] baud rate value */
 500         pl2303_encode_baud_rate(tty, port, &buf[0]);
 501
 502         /* For reference buf[4]=0 is 1 stop bits */
 503         /* For reference buf[4]=1 is 1.5 stop bits */
 504         /* For reference buf[4]=2 is 2 stop bits */
 505         if (C_CSTOPB(tty)) {
 506                 /*
 507                  * NOTE: Comply with "real" UARTs / RS232:
 508                  *       use 1.5 instead of 2 stop bits with 5 data bits
 509                  */
 510                 if (C_CSIZE(tty) == CS5) {
 511                         buf[4] = 1;
 512                         dev_dbg(&port->dev, "stop bits = 1.5\n");
 513                 } else {
 514                         buf[4] = 2;
 515                         dev_dbg(&port->dev, "stop bits = 2\n");
 516                 }
 517         } else {
 518                 buf[4] = 0;
 519                 dev_dbg(&port->dev, "stop bits = 1\n");
 520         }
 521
 522         if (C_PARENB(tty)) {
 523                 /* For reference buf[5]=0 is none parity */
 524                 /* For reference buf[5]=1 is odd parity */
 525                 /* For reference buf[5]=2 is even parity */
 526                 /* For reference buf[5]=3 is mark parity */
 527                 /* For reference buf[5]=4 is space parity */
 528                 if (C_PARODD(tty)) {
 529                         if (C_CMSPAR(tty)) {
 530                                 buf[5] = 3;
 531                                 dev_dbg(&port->dev, "parity = mark\n");
 532                         } else {
 533                                 buf[5] = 1;
 534                                 dev_dbg(&port->dev, "parity = odd\n");
 535                         }
 536                 } else {
 537                         if (C_CMSPAR(tty)) {
 538                                 buf[5] = 4;
 539                                 dev_dbg(&port->dev, "parity = space\n");
 540                         } else {
 541                                 buf[5] = 2;
 542                                 dev_dbg(&port->dev, "parity = even\n");
 543                         }
 544                 }
 545         } else {
 546                 buf[5] = 0;
 547                 dev_dbg(&port->dev, "parity = none\n");
 548         }
 549
 550         /*
 551          * Some PL2303 are known to lose bytes if you change serial settings
 552          * even to the same values as before. Thus we actually need to filter
 553          * in this specific case.
 554          *
 555          * Note that the tty_termios_hw_change check above is not sufficient
 556          * as a previously requested baud rate may differ from the one
 557          * actually used (and stored in old_termios).
 558          *
 559          * NOTE: No additional locking needed for line_settings as it is
 560          *       only used in set_termios, which is serialised against itself.
 561          */
 562         if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
 563                 ret = pl2303_set_line_request(port, buf);
 564                 if (!ret)
 565                         memcpy(priv->line_settings, buf, 7);
 566         }
 567
 568         /* change control lines if we are switching to or from B0 */
 569         spin_lock_irqsave(&priv->lock, flags);
 570         control = priv->line_control;
 571         if (C_BAUD(tty) == B0)
 572                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 573         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
 574                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 575         if (control != priv->line_control) {
 576                 control = priv->line_control;
 577                 spin_unlock_irqrestore(&priv->lock, flags);
 578                 pl2303_set_control_lines(port, control);
 579         } else {
 580                 spin_unlock_irqrestore(&priv->lock, flags);
 581         }
 582
 583         if (C_CRTSCTS(tty)) {
 584                 if (spriv->quirks & PL2303_QUIRK_LEGACY)
 585                         pl2303_vendor_write(serial, 0x0, 0x41);
 586                 else
 587                         pl2303_vendor_write(serial, 0x0, 0x61);
 588         } else {
 589                 pl2303_vendor_write(serial, 0x0, 0x0);
 590         }
 591
 592         kfree(buf);
 593 }
 594
 595 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
 596 {
 597         struct pl2303_private *priv = usb_get_serial_port_data(port);
 598         unsigned long flags;
 599         u8 control;
 600
 601         spin_lock_irqsave(&priv->lock, flags);
 602         if (on)
 603                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 604         else
 605                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 606         control = priv->line_control;
 607         spin_unlock_irqrestore(&priv->lock, flags);
 608
 609         pl2303_set_control_lines(port, control);
 610 }
 611
 612 static void pl2303_close(struct usb_serial_port *port)
 613 {
 614         usb_serial_generic_close(port);
 615         usb_kill_urb(port->interrupt_in_urb);
 616 }
 617
 618 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
 619 {
 620         struct usb_serial *serial = port->serial;
 621         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 622         int result;
 623
 624         if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 625                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 626                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 627         } else {
 628                 /* reset upstream data pipes */
 629                 pl2303_vendor_write(serial, 8, 0);
 630                 pl2303_vendor_write(serial, 9, 0);
 631         }
 632
 633         /* Setup termios */
 634         if (tty)
 635                 pl2303_set_termios(tty, port, NULL);
 636
 637         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 638         if (result) {
 639                 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
 640                         result);
 641                 return result;
 642         }
 643
 644         result = usb_serial_generic_open(tty, port);
 645         if (result) {
 646                 usb_kill_urb(port->interrupt_in_urb);
 647                 return result;
 648         }
 649
 650         return 0;
 651 }
 652
 653 static int pl2303_tiocmset(struct tty_struct *tty,
 654                            unsigned int set, unsigned int clear)
 655 {
 656         struct usb_serial_port *port = tty->driver_data;
 657         struct pl2303_private *priv = usb_get_serial_port_data(port);
 658         unsigned long flags;
 659         u8 control;
 660         int ret;
 661
 662         spin_lock_irqsave(&priv->lock, flags);
 663         if (set & TIOCM_RTS)
 664                 priv->line_control |= CONTROL_RTS;
 665         if (set & TIOCM_DTR)
 666                 priv->line_control |= CONTROL_DTR;
 667         if (clear & TIOCM_RTS)
 668                 priv->line_control &= ~CONTROL_RTS;
 669         if (clear & TIOCM_DTR)
 670                 priv->line_control &= ~CONTROL_DTR;
 671         control = priv->line_control;
 672         spin_unlock_irqrestore(&priv->lock, flags);
 673
 674         ret = pl2303_set_control_lines(port, control);
 675         if (ret)
 676                 return usb_translate_errors(ret);
 677
 678         return 0;
 679 }
 680
 681 static int pl2303_tiocmget(struct tty_struct *tty)
 682 {
 683         struct usb_serial_port *port = tty->driver_data;
 684         struct pl2303_private *priv = usb_get_serial_port_data(port);
 685         unsigned long flags;
 686         unsigned int mcr;
 687         unsigned int status;
 688         unsigned int result;
 689
 690         spin_lock_irqsave(&priv->lock, flags);
 691         mcr = priv->line_control;
 692         status = priv->line_status;
 693         spin_unlock_irqrestore(&priv->lock, flags);
 694
 695         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 696                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 697                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 698                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 699                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 700                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 701
 702         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
 703
 704         return result;
 705 }
 706
 707 static int pl2303_carrier_raised(struct usb_serial_port *port)
 708 {
 709         struct pl2303_private *priv = usb_get_serial_port_data(port);
 710
 711         if (priv->line_status & UART_DCD)
 712                 return 1;
 713
 714         return 0;
 715 }
 716
 717 static int pl2303_ioctl(struct tty_struct *tty,
 718                         unsigned int cmd, unsigned long arg)
 719 {
 720         struct serial_struct ser;
 721         struct usb_serial_port *port = tty->driver_data;
 722
 723         switch (cmd) {
 724         case TIOCGSERIAL:
 725                 memset(&ser, 0, sizeof ser);
 726                 ser.type = PORT_16654;
 727                 ser.line = port->minor;
 728                 ser.port = port->port_number;
 729                 ser.baud_base = 460800;
 730
 731                 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
 732                         return -EFAULT;
 733
 734                 return 0;
 735         default:
 736                 break;
 737         }
 738
 739         return -ENOIOCTLCMD;
 740 }
 741
 742 static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
 743 {
 744         struct usb_serial_port *port = tty->driver_data;
 745         struct usb_serial *serial = port->serial;
 746         u16 state;
 747         int result;
 748
 749         if (break_state == 0)
 750                 state = BREAK_OFF;
 751         else
 752                 state = BREAK_ON;
 753
 754         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
 755                         state == BREAK_OFF ? "off" : "on");
 756
 757         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 758                                  BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 759                                  0, NULL, 0, 100);
 760         if (result)
 761                 dev_err(&port->dev, "error sending break = %d\n", result);
 762 }
 763
 764 static void pl2303_update_line_status(struct usb_serial_port *port,
 765                                       unsigned char *data,
 766                                       unsigned int actual_length)
 767 {
 768         struct usb_serial *serial = port->serial;
 769         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 770         struct pl2303_private *priv = usb_get_serial_port_data(port);
 771         struct tty_struct *tty;
 772         unsigned long flags;
 773         unsigned int status_idx = UART_STATE_INDEX;
 774         u8 status;
 775         u8 delta;
 776
 777         if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
 778                 status_idx = 0;
 779
 780         if (actual_length < status_idx + 1)
 781                 return;
 782
 783         status = data[status_idx];
 784
 785         /* Save off the uart status for others to look at */
 786         spin_lock_irqsave(&priv->lock, flags);
 787         delta = priv->line_status ^ status;
 788         priv->line_status = status;
 789         spin_unlock_irqrestore(&priv->lock, flags);
 790
 791         if (status & UART_BREAK_ERROR)
 792                 usb_serial_handle_break(port);
 793
 794         if (delta & UART_STATE_MSR_MASK) {
 795                 if (delta & UART_CTS)
 796                         port->icount.cts++;
 797                 if (delta & UART_DSR)
 798                         port->icount.dsr++;
 799                 if (delta & UART_RING)
 800                         port->icount.rng++;
 801                 if (delta & UART_DCD) {
 802                         port->icount.dcd++;
 803                         tty = tty_port_tty_get(&port->port);
 804                         if (tty) {
 805                                 usb_serial_handle_dcd_change(port, tty,
 806                                                         status & UART_DCD);
 807                                 tty_kref_put(tty);
 808                         }
 809                 }
 810
 811                 wake_up_interruptible(&port->port.delta_msr_wait);
 812         }
 813 }
 814
 815 static void pl2303_read_int_callback(struct urb *urb)
 816 {
 817         struct usb_serial_port *port =  urb->context;
 818         unsigned char *data = urb->transfer_buffer;
 819         unsigned int actual_length = urb->actual_length;
 820         int status = urb->status;
 821         int retval;
 822
 823         switch (status) {
 824         case 0:
 825                 /* success */
 826                 break;
 827         case -ECONNRESET:
 828         case -ENOENT:
 829         case -ESHUTDOWN:
 830                 /* this urb is terminated, clean up */
 831                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
 832                         __func__, status);
 833                 return;
 834         default:
 835                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
 836                         __func__, status);
 837                 goto exit;
 838         }
 839
 840         usb_serial_debug_data(&port->dev, __func__,
 841                               urb->actual_length, urb->transfer_buffer);
 842
 843         pl2303_update_line_status(port, data, actual_length);
 844
 845 exit:
 846         retval = usb_submit_urb(urb, GFP_ATOMIC);
 847         if (retval) {
 848                 dev_err(&port->dev,
 849                         "%s - usb_submit_urb failed with result %d\n",
 850                         __func__, retval);
 851         }
 852 }
 853
 854 static void pl2303_process_read_urb(struct urb *urb)
 855 {
 856         struct usb_serial_port *port = urb->context;
 857         struct pl2303_private *priv = usb_get_serial_port_data(port);
 858         unsigned char *data = urb->transfer_buffer;
 859         char tty_flag = TTY_NORMAL;
 860         unsigned long flags;
 861         u8 line_status;
 862         int i;
 863
 864         /* update line status */
 865         spin_lock_irqsave(&priv->lock, flags);
 866         line_status = priv->line_status;
 867         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 868         spin_unlock_irqrestore(&priv->lock, flags);
 869
 870         if (!urb->actual_length)
 871                 return;
 872
 873         /*
 874          * Break takes precedence over parity, which takes precedence over
 875          * framing errors.
 876          */
 877         if (line_status & UART_BREAK_ERROR)
 878                 tty_flag = TTY_BREAK;
 879         else if (line_status & UART_PARITY_ERROR)
 880                 tty_flag = TTY_PARITY;
 881         else if (line_status & UART_FRAME_ERROR)
 882                 tty_flag = TTY_FRAME;
 883
 884         if (tty_flag != TTY_NORMAL)
 885                 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
 886                                                                 tty_flag);
 887         /* overrun is special, not associated with a char */
 888         if (line_status & UART_OVERRUN_ERROR)
 889                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 890
 891         if (port->port.console && port->sysrq) {
 892                 for (i = 0; i < urb->actual_length; ++i)
 893                         if (!usb_serial_handle_sysrq_char(port, data[i]))
 894                                 tty_insert_flip_char(&port->port, data[i],
 895                                                 tty_flag);
 896         } else {
 897                 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
 898                                                         urb->actual_length);
 899         }
 900
 901         tty_flip_buffer_push(&port->port);
 902 }
 903
 904 static struct usb_serial_driver pl2303_device = {
 905         .driver = {
 906                 .owner =        THIS_MODULE,
 907                 .name =         "pl2303",
 908         },
 909         .id_table =             id_table,
 910         .num_ports =            1,
 911         .bulk_in_size =         256,
 912         .bulk_out_size =        256,
 913         .open =                 pl2303_open,
 914         .close =                pl2303_close,
 915         .dtr_rts =              pl2303_dtr_rts,
 916         .carrier_raised =       pl2303_carrier_raised,
 917         .ioctl =                pl2303_ioctl,
 918         .break_ctl =            pl2303_break_ctl,
 919         .set_termios =          pl2303_set_termios,
 920         .tiocmget =             pl2303_tiocmget,
 921         .tiocmset =             pl2303_tiocmset,
 922         .tiocmiwait =           usb_serial_generic_tiocmiwait,
 923         .process_read_urb =     pl2303_process_read_urb,
 924         .read_int_callback =    pl2303_read_int_callback,
 925         .probe =                pl2303_probe,
 926         .attach =               pl2303_startup,
 927         .release =              pl2303_release,
 928         .port_probe =           pl2303_port_probe,
 929         .port_remove =          pl2303_port_remove,
 930 };
 931
 932 static struct usb_serial_driver * const serial_drivers[] = {
 933         &pl2303_device, NULL
 934 };
 935
 936 module_usb_serial_driver(serial_drivers, id_table);
 937
 938 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
 939 MODULE_LICENSE("GPL");