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 ([email protected])
   6  * Copyright (C) 2003 IBM Corp.
   7  *
   8  * Original driver for 2.2.x by anonymous
   9  *
  10  * See Documentation/usb/usb-serial.txt 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_PHAROS) },
  42         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
  43         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
  44         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
  45         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
  46         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
  47         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
  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                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  52         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC485),
  53                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  54         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) },
  55         { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
  56         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  57         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
  58         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  59         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
  60         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  61         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  62         { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
  63         { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
  64         { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
  65         { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
  66         { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
  67         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
  68                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  69         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
  70                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  71         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
  72                 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
  73         { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81),
  74                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  75         { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
  76         { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
  77         { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
  78         { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
  79         { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
  80         { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
  81         { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
  82         { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
  83         { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
  84         { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID),
  85                 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
  86         { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
  87         { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
  88         { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
  89         { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
  90         { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
  91         { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
  92         { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
  93         { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
  94         { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
  95         { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
  96         { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
  97         { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
  98         { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
  99         { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
 100         { }                                     /* Terminating entry */
 101 };
 102
 103 MODULE_DEVICE_TABLE(usb, id_table);
 104
 105 #define SET_LINE_REQUEST_TYPE           0x21
 106 #define SET_LINE_REQUEST                0x20
 107
 108 #define SET_CONTROL_REQUEST_TYPE        0x21
 109 #define SET_CONTROL_REQUEST             0x22
 110 #define CONTROL_DTR                     0x01
 111 #define CONTROL_RTS                     0x02
 112
 113 #define BREAK_REQUEST_TYPE              0x21
 114 #define BREAK_REQUEST                   0x23
 115 #define BREAK_ON                        0xffff
 116 #define BREAK_OFF                       0x0000
 117
 118 #define GET_LINE_REQUEST_TYPE           0xa1
 119 #define GET_LINE_REQUEST                0x21
 120
 121 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 122 #define VENDOR_WRITE_REQUEST            0x01
 123
 124 #define VENDOR_READ_REQUEST_TYPE        0xc0
 125 #define VENDOR_READ_REQUEST             0x01
 126
 127 #define UART_STATE_INDEX                8
 128 #define UART_STATE_MSR_MASK             0x8b
 129 #define UART_STATE_TRANSIENT_MASK       0x74
 130 #define UART_DCD                        0x01
 131 #define UART_DSR                        0x02
 132 #define UART_BREAK_ERROR                0x04
 133 #define UART_RING                       0x08
 134 #define UART_FRAME_ERROR                0x10
 135 #define UART_PARITY_ERROR               0x20
 136 #define UART_OVERRUN_ERROR              0x40
 137 #define UART_CTS                        0x80
 138
 139 static void pl2303_set_break(struct usb_serial_port *port, bool enable);
 140
 141 enum pl2303_type {
 142         TYPE_01,        /* Type 0 and 1 (difference unknown) */
 143         TYPE_HX,        /* HX version of the pl2303 chip */
 144         TYPE_COUNT
 145 };
 146
 147 struct pl2303_type_data {
 148         speed_t max_baud_rate;
 149         unsigned long quirks;
 150 };
 151
 152 struct pl2303_serial_private {
 153         const struct pl2303_type_data *type;
 154         unsigned long quirks;
 155 };
 156
 157 struct pl2303_private {
 158         spinlock_t lock;
 159         u8 line_control;
 160         u8 line_status;
 161
 162         u8 line_settings[7];
 163 };
 164
 165 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
 166         [TYPE_01] = {
 167                 .max_baud_rate =        1228800,
 168                 .quirks =               PL2303_QUIRK_LEGACY,
 169         },
 170         [TYPE_HX] = {
 171                 .max_baud_rate =        12000000,
 172         },
 173 };
 174
 175 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
 176                                                         unsigned char buf[1])
 177 {
 178         struct device *dev = &serial->interface->dev;
 179         int res;
 180
 181         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 182                         VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
 183                         value, 0, buf, 1, 100);
 184         if (res != 1) {
 185                 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
 186                                                                 value, res);
 187                 if (res >= 0)
 188                         res = -EIO;
 189
 190                 return res;
 191         }
 192
 193         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
 194
 195         return 0;
 196 }
 197
 198 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
 199 {
 200         struct device *dev = &serial->interface->dev;
 201         int res;
 202
 203         dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
 204
 205         res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 206                         VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
 207                         value, index, NULL, 0, 100);
 208         if (res) {
 209                 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
 210                                                                 value, res);
 211                 return res;
 212         }
 213
 214         return 0;
 215 }
 216
 217 static int pl2303_probe(struct usb_serial *serial,
 218                                         const struct usb_device_id *id)
 219 {
 220         usb_set_serial_data(serial, (void *)id->driver_info);
 221
 222         return 0;
 223 }
 224
 225 /*
 226  * Use interrupt endpoint from first interface if available.
 227  *
 228  * This is needed due to the looney way its endpoints are set up.
 229  */
 230 static int pl2303_endpoint_hack(struct usb_serial *serial,
 231                                         struct usb_serial_endpoints *epds)
 232 {
 233         struct usb_interface *interface = serial->interface;
 234         struct usb_device *dev = serial->dev;
 235         struct device *ddev = &interface->dev;
 236         struct usb_host_interface *iface_desc;
 237         struct usb_endpoint_descriptor *endpoint;
 238         unsigned int i;
 239
 240         if (interface == dev->actconfig->interface[0])
 241                 return 0;
 242
 243         /* check out the endpoints of the other interface */
 244         iface_desc = dev->actconfig->interface[0]->cur_altsetting;
 245
 246         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 247                 endpoint = &iface_desc->endpoint[i].desc;
 248
 249                 if (!usb_endpoint_is_int_in(endpoint))
 250                         continue;
 251
 252                 dev_dbg(ddev, "found interrupt in on separate interface\n");
 253                 if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
 254                         epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
 255         }
 256
 257         return 0;
 258 }
 259
 260 static int pl2303_calc_num_ports(struct usb_serial *serial,
 261                                         struct usb_serial_endpoints *epds)
 262 {
 263         unsigned long quirks = (unsigned long)usb_get_serial_data(serial);
 264         struct device *dev = &serial->interface->dev;
 265         int ret;
 266
 267         if (quirks & PL2303_QUIRK_ENDPOINT_HACK) {
 268                 ret = pl2303_endpoint_hack(serial, epds);
 269                 if (ret)
 270                         return ret;
 271         }
 272
 273         if (epds->num_interrupt_in < 1) {
 274                 dev_err(dev, "required interrupt-in endpoint missing\n");
 275                 return -ENODEV;
 276         }
 277
 278         return 1;
 279 }
 280
 281 static int pl2303_startup(struct usb_serial *serial)
 282 {
 283         struct pl2303_serial_private *spriv;
 284         enum pl2303_type type = TYPE_01;
 285         unsigned char *buf;
 286
 287         spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
 288         if (!spriv)
 289                 return -ENOMEM;
 290
 291         buf = kmalloc(1, GFP_KERNEL);
 292         if (!buf) {
 293                 kfree(spriv);
 294                 return -ENOMEM;
 295         }
 296
 297         if (serial->dev->descriptor.bDeviceClass == 0x02)
 298                 type = TYPE_01;         /* type 0 */
 299         else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
 300                 type = TYPE_HX;
 301         else if (serial->dev->descriptor.bDeviceClass == 0x00)
 302                 type = TYPE_01;         /* type 1 */
 303         else if (serial->dev->descriptor.bDeviceClass == 0xFF)
 304                 type = TYPE_01;         /* type 1 */
 305         dev_dbg(&serial->interface->dev, "device type: %d\n", type);
 306
 307         spriv->type = &pl2303_type_data[type];
 308         spriv->quirks = (unsigned long)usb_get_serial_data(serial);
 309         spriv->quirks |= spriv->type->quirks;
 310
 311         usb_set_serial_data(serial, spriv);
 312
 313         pl2303_vendor_read(serial, 0x8484, buf);
 314         pl2303_vendor_write(serial, 0x0404, 0);
 315         pl2303_vendor_read(serial, 0x8484, buf);
 316         pl2303_vendor_read(serial, 0x8383, buf);
 317         pl2303_vendor_read(serial, 0x8484, buf);
 318         pl2303_vendor_write(serial, 0x0404, 1);
 319         pl2303_vendor_read(serial, 0x8484, buf);
 320         pl2303_vendor_read(serial, 0x8383, buf);
 321         pl2303_vendor_write(serial, 0, 1);
 322         pl2303_vendor_write(serial, 1, 0);
 323         if (spriv->quirks & PL2303_QUIRK_LEGACY)
 324                 pl2303_vendor_write(serial, 2, 0x24);
 325         else
 326                 pl2303_vendor_write(serial, 2, 0x44);
 327
 328         kfree(buf);
 329
 330         return 0;
 331 }
 332
 333 static void pl2303_release(struct usb_serial *serial)
 334 {
 335         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 336
 337         kfree(spriv);
 338 }
 339
 340 static int pl2303_port_probe(struct usb_serial_port *port)
 341 {
 342         struct pl2303_private *priv;
 343
 344         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 345         if (!priv)
 346                 return -ENOMEM;
 347
 348         spin_lock_init(&priv->lock);
 349
 350         usb_set_serial_port_data(port, priv);
 351
 352         port->port.drain_delay = 256;
 353
 354         return 0;
 355 }
 356
 357 static int pl2303_port_remove(struct usb_serial_port *port)
 358 {
 359         struct pl2303_private *priv = usb_get_serial_port_data(port);
 360
 361         kfree(priv);
 362
 363         return 0;
 364 }
 365
 366 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
 367 {
 368         struct usb_device *dev = port->serial->dev;
 369         int retval;
 370
 371         dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
 372
 373         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 374                                  SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 375                                  value, 0, NULL, 0, 100);
 376         if (retval)
 377                 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
 378
 379         return retval;
 380 }
 381
 382 /*
 383  * Returns the nearest supported baud rate that can be set directly without
 384  * using divisors.
 385  */
 386 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
 387 {
 388         static const speed_t baud_sup[] = {
 389                 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
 390                 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
 391                 614400, 921600, 1228800, 2457600, 3000000, 6000000
 392         };
 393
 394         unsigned i;
 395
 396         for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
 397                 if (baud_sup[i] > baud)
 398                         break;
 399         }
 400
 401         if (i == ARRAY_SIZE(baud_sup))
 402                 baud = baud_sup[i - 1];
 403         else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
 404                 baud = baud_sup[i - 1];
 405         else
 406                 baud = baud_sup[i];
 407
 408         return baud;
 409 }
 410
 411 /*
 412  * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
 413  *       use 9600 baud.
 414  */
 415 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
 416                                                                 speed_t baud)
 417 {
 418         put_unaligned_le32(baud, buf);
 419
 420         return baud;
 421 }
 422
 423 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
 424                                                                 speed_t baud)
 425 {
 426         unsigned int baseline, mantissa, exponent;
 427
 428         /*
 429          * Apparently the formula is:
 430          *   baudrate = 12M * 32 / (mantissa * 4^exponent)
 431          * where
 432          *   mantissa = buf[8:0]
 433          *   exponent = buf[11:9]
 434          */
 435         baseline = 12000000 * 32;
 436         mantissa = baseline / baud;
 437         if (mantissa == 0)
 438                 mantissa = 1;   /* Avoid dividing by zero if baud > 32*12M. */
 439         exponent = 0;
 440         while (mantissa >= 512) {
 441                 if (exponent < 7) {
 442                         mantissa >>= 2; /* divide by 4 */
 443                         exponent++;
 444                 } else {
 445                         /* Exponent is maxed. Trim mantissa and leave. */
 446                         mantissa = 511;
 447                         break;
 448                 }
 449         }
 450
 451         buf[3] = 0x80;
 452         buf[2] = 0;
 453         buf[1] = exponent << 1 | mantissa >> 8;
 454         buf[0] = mantissa & 0xff;
 455
 456         /* Calculate and return the exact baud rate. */
 457         baud = (baseline / mantissa) >> (exponent << 1);
 458
 459         return baud;
 460 }
 461
 462 static void pl2303_encode_baud_rate(struct tty_struct *tty,
 463                                         struct usb_serial_port *port,
 464                                         u8 buf[4])
 465 {
 466         struct usb_serial *serial = port->serial;
 467         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 468         speed_t baud_sup;
 469         speed_t baud;
 470
 471         baud = tty_get_baud_rate(tty);
 472         dev_dbg(&port->dev, "baud requested = %u\n", baud);
 473         if (!baud)
 474                 return;
 475
 476         if (spriv->type->max_baud_rate)
 477                 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
 478         /*
 479          * Use direct method for supported baud rates, otherwise use divisors.
 480          */
 481         baud_sup = pl2303_get_supported_baud_rate(baud);
 482
 483         if (baud == baud_sup)
 484                 baud = pl2303_encode_baud_rate_direct(buf, baud);
 485         else
 486                 baud = pl2303_encode_baud_rate_divisor(buf, baud);
 487
 488         /* Save resulting baud rate */
 489         tty_encode_baud_rate(tty, baud, baud);
 490         dev_dbg(&port->dev, "baud set = %u\n", baud);
 491 }
 492
 493 static int pl2303_get_line_request(struct usb_serial_port *port,
 494                                                         unsigned char buf[7])
 495 {
 496         struct usb_device *udev = port->serial->dev;
 497         int ret;
 498
 499         ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
 500                                 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 501                                 0, 0, buf, 7, 100);
 502         if (ret != 7) {
 503                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 504
 505                 if (ret >= 0)
 506                         ret = -EIO;
 507
 508                 return ret;
 509         }
 510
 511         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 512
 513         return 0;
 514 }
 515
 516 static int pl2303_set_line_request(struct usb_serial_port *port,
 517                                                         unsigned char buf[7])
 518 {
 519         struct usb_device *udev = port->serial->dev;
 520         int ret;
 521
 522         ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
 523                                 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 524                                 0, 0, buf, 7, 100);
 525         if (ret < 0) {
 526                 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
 527                 return ret;
 528         }
 529
 530         dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
 531
 532         return 0;
 533 }
 534
 535 static void pl2303_set_termios(struct tty_struct *tty,
 536                 struct usb_serial_port *port, struct ktermios *old_termios)
 537 {
 538         struct usb_serial *serial = port->serial;
 539         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 540         struct pl2303_private *priv = usb_get_serial_port_data(port);
 541         unsigned long flags;
 542         unsigned char *buf;
 543         int ret;
 544         u8 control;
 545
 546         if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
 547                 return;
 548
 549         buf = kzalloc(7, GFP_KERNEL);
 550         if (!buf) {
 551                 /* Report back no change occurred */
 552                 if (old_termios)
 553                         tty->termios = *old_termios;
 554                 return;
 555         }
 556
 557         pl2303_get_line_request(port, buf);
 558
 559         switch (C_CSIZE(tty)) {
 560         case CS5:
 561                 buf[6] = 5;
 562                 break;
 563         case CS6:
 564                 buf[6] = 6;
 565                 break;
 566         case CS7:
 567                 buf[6] = 7;
 568                 break;
 569         default:
 570         case CS8:
 571                 buf[6] = 8;
 572         }
 573         dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
 574
 575         /* For reference buf[0]:buf[3] baud rate value */
 576         pl2303_encode_baud_rate(tty, port, &buf[0]);
 577
 578         /* For reference buf[4]=0 is 1 stop bits */
 579         /* For reference buf[4]=1 is 1.5 stop bits */
 580         /* For reference buf[4]=2 is 2 stop bits */
 581         if (C_CSTOPB(tty)) {
 582                 /*
 583                  * NOTE: Comply with "real" UARTs / RS232:
 584                  *       use 1.5 instead of 2 stop bits with 5 data bits
 585                  */
 586                 if (C_CSIZE(tty) == CS5) {
 587                         buf[4] = 1;
 588                         dev_dbg(&port->dev, "stop bits = 1.5\n");
 589                 } else {
 590                         buf[4] = 2;
 591                         dev_dbg(&port->dev, "stop bits = 2\n");
 592                 }
 593         } else {
 594                 buf[4] = 0;
 595                 dev_dbg(&port->dev, "stop bits = 1\n");
 596         }
 597
 598         if (C_PARENB(tty)) {
 599                 /* For reference buf[5]=0 is none parity */
 600                 /* For reference buf[5]=1 is odd parity */
 601                 /* For reference buf[5]=2 is even parity */
 602                 /* For reference buf[5]=3 is mark parity */
 603                 /* For reference buf[5]=4 is space parity */
 604                 if (C_PARODD(tty)) {
 605                         if (C_CMSPAR(tty)) {
 606                                 buf[5] = 3;
 607                                 dev_dbg(&port->dev, "parity = mark\n");
 608                         } else {
 609                                 buf[5] = 1;
 610                                 dev_dbg(&port->dev, "parity = odd\n");
 611                         }
 612                 } else {
 613                         if (C_CMSPAR(tty)) {
 614                                 buf[5] = 4;
 615                                 dev_dbg(&port->dev, "parity = space\n");
 616                         } else {
 617                                 buf[5] = 2;
 618                                 dev_dbg(&port->dev, "parity = even\n");
 619                         }
 620                 }
 621         } else {
 622                 buf[5] = 0;
 623                 dev_dbg(&port->dev, "parity = none\n");
 624         }
 625
 626         /*
 627          * Some PL2303 are known to lose bytes if you change serial settings
 628          * even to the same values as before. Thus we actually need to filter
 629          * in this specific case.
 630          *
 631          * Note that the tty_termios_hw_change check above is not sufficient
 632          * as a previously requested baud rate may differ from the one
 633          * actually used (and stored in old_termios).
 634          *
 635          * NOTE: No additional locking needed for line_settings as it is
 636          *       only used in set_termios, which is serialised against itself.
 637          */
 638         if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
 639                 ret = pl2303_set_line_request(port, buf);
 640                 if (!ret)
 641                         memcpy(priv->line_settings, buf, 7);
 642         }
 643
 644         /* change control lines if we are switching to or from B0 */
 645         spin_lock_irqsave(&priv->lock, flags);
 646         control = priv->line_control;
 647         if (C_BAUD(tty) == B0)
 648                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 649         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
 650                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 651         if (control != priv->line_control) {
 652                 control = priv->line_control;
 653                 spin_unlock_irqrestore(&priv->lock, flags);
 654                 pl2303_set_control_lines(port, control);
 655         } else {
 656                 spin_unlock_irqrestore(&priv->lock, flags);
 657         }
 658
 659         if (C_CRTSCTS(tty)) {
 660                 if (spriv->quirks & PL2303_QUIRK_LEGACY)
 661                         pl2303_vendor_write(serial, 0x0, 0x41);
 662                 else
 663                         pl2303_vendor_write(serial, 0x0, 0x61);
 664         } else {
 665                 pl2303_vendor_write(serial, 0x0, 0x0);
 666         }
 667
 668         kfree(buf);
 669 }
 670
 671 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
 672 {
 673         struct pl2303_private *priv = usb_get_serial_port_data(port);
 674         unsigned long flags;
 675         u8 control;
 676
 677         spin_lock_irqsave(&priv->lock, flags);
 678         if (on)
 679                 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 680         else
 681                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 682         control = priv->line_control;
 683         spin_unlock_irqrestore(&priv->lock, flags);
 684
 685         pl2303_set_control_lines(port, control);
 686 }
 687
 688 static void pl2303_close(struct usb_serial_port *port)
 689 {
 690         usb_serial_generic_close(port);
 691         usb_kill_urb(port->interrupt_in_urb);
 692         pl2303_set_break(port, false);
 693 }
 694
 695 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
 696 {
 697         struct usb_serial *serial = port->serial;
 698         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 699         int result;
 700
 701         if (spriv->quirks & PL2303_QUIRK_LEGACY) {
 702                 usb_clear_halt(serial->dev, port->write_urb->pipe);
 703                 usb_clear_halt(serial->dev, port->read_urb->pipe);
 704         } else {
 705                 /* reset upstream data pipes */
 706                 pl2303_vendor_write(serial, 8, 0);
 707                 pl2303_vendor_write(serial, 9, 0);
 708         }
 709
 710         /* Setup termios */
 711         if (tty)
 712                 pl2303_set_termios(tty, port, NULL);
 713
 714         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 715         if (result) {
 716                 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
 717                         result);
 718                 return result;
 719         }
 720
 721         result = usb_serial_generic_open(tty, port);
 722         if (result) {
 723                 usb_kill_urb(port->interrupt_in_urb);
 724                 return result;
 725         }
 726
 727         return 0;
 728 }
 729
 730 static int pl2303_tiocmset(struct tty_struct *tty,
 731                            unsigned int set, unsigned int clear)
 732 {
 733         struct usb_serial_port *port = tty->driver_data;
 734         struct pl2303_private *priv = usb_get_serial_port_data(port);
 735         unsigned long flags;
 736         u8 control;
 737         int ret;
 738
 739         spin_lock_irqsave(&priv->lock, flags);
 740         if (set & TIOCM_RTS)
 741                 priv->line_control |= CONTROL_RTS;
 742         if (set & TIOCM_DTR)
 743                 priv->line_control |= CONTROL_DTR;
 744         if (clear & TIOCM_RTS)
 745                 priv->line_control &= ~CONTROL_RTS;
 746         if (clear & TIOCM_DTR)
 747                 priv->line_control &= ~CONTROL_DTR;
 748         control = priv->line_control;
 749         spin_unlock_irqrestore(&priv->lock, flags);
 750
 751         ret = pl2303_set_control_lines(port, control);
 752         if (ret)
 753                 return usb_translate_errors(ret);
 754
 755         return 0;
 756 }
 757
 758 static int pl2303_tiocmget(struct tty_struct *tty)
 759 {
 760         struct usb_serial_port *port = tty->driver_data;
 761         struct pl2303_private *priv = usb_get_serial_port_data(port);
 762         unsigned long flags;
 763         unsigned int mcr;
 764         unsigned int status;
 765         unsigned int result;
 766
 767         spin_lock_irqsave(&priv->lock, flags);
 768         mcr = priv->line_control;
 769         status = priv->line_status;
 770         spin_unlock_irqrestore(&priv->lock, flags);
 771
 772         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 773                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0)
 774                   | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 775                   | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 776                   | ((status & UART_RING)       ? TIOCM_RI  : 0)
 777                   | ((status & UART_DCD)        ? TIOCM_CD  : 0);
 778
 779         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
 780
 781         return result;
 782 }
 783
 784 static int pl2303_carrier_raised(struct usb_serial_port *port)
 785 {
 786         struct pl2303_private *priv = usb_get_serial_port_data(port);
 787
 788         if (priv->line_status & UART_DCD)
 789                 return 1;
 790
 791         return 0;
 792 }
 793
 794 static int pl2303_ioctl(struct tty_struct *tty,
 795                         unsigned int cmd, unsigned long arg)
 796 {
 797         struct serial_struct ser;
 798         struct usb_serial_port *port = tty->driver_data;
 799
 800         switch (cmd) {
 801         case TIOCGSERIAL:
 802                 memset(&ser, 0, sizeof ser);
 803                 ser.type = PORT_16654;
 804                 ser.line = port->minor;
 805                 ser.port = port->port_number;
 806                 ser.baud_base = 460800;
 807
 808                 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
 809                         return -EFAULT;
 810
 811                 return 0;
 812         default:
 813                 break;
 814         }
 815
 816         return -ENOIOCTLCMD;
 817 }
 818
 819 static void pl2303_set_break(struct usb_serial_port *port, bool enable)
 820 {
 821         struct usb_serial *serial = port->serial;
 822         u16 state;
 823         int result;
 824
 825         if (enable)
 826                 state = BREAK_ON;
 827         else
 828                 state = BREAK_OFF;
 829
 830         dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
 831                         state == BREAK_OFF ? "off" : "on");
 832
 833         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 834                                  BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 835                                  0, NULL, 0, 100);
 836         if (result)
 837                 dev_err(&port->dev, "error sending break = %d\n", result);
 838 }
 839
 840 static void pl2303_break_ctl(struct tty_struct *tty, int state)
 841 {
 842         struct usb_serial_port *port = tty->driver_data;
 843
 844         pl2303_set_break(port, state);
 845 }
 846
 847 static void pl2303_update_line_status(struct usb_serial_port *port,
 848                                       unsigned char *data,
 849                                       unsigned int actual_length)
 850 {
 851         struct usb_serial *serial = port->serial;
 852         struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
 853         struct pl2303_private *priv = usb_get_serial_port_data(port);
 854         struct tty_struct *tty;
 855         unsigned long flags;
 856         unsigned int status_idx = UART_STATE_INDEX;
 857         u8 status;
 858         u8 delta;
 859
 860         if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
 861                 status_idx = 0;
 862
 863         if (actual_length < status_idx + 1)
 864                 return;
 865
 866         status = data[status_idx];
 867
 868         /* Save off the uart status for others to look at */
 869         spin_lock_irqsave(&priv->lock, flags);
 870         delta = priv->line_status ^ status;
 871         priv->line_status = status;
 872         spin_unlock_irqrestore(&priv->lock, flags);
 873
 874         if (status & UART_BREAK_ERROR)
 875                 usb_serial_handle_break(port);
 876
 877         if (delta & UART_STATE_MSR_MASK) {
 878                 if (delta & UART_CTS)
 879                         port->icount.cts++;
 880                 if (delta & UART_DSR)
 881                         port->icount.dsr++;
 882                 if (delta & UART_RING)
 883                         port->icount.rng++;
 884                 if (delta & UART_DCD) {
 885                         port->icount.dcd++;
 886                         tty = tty_port_tty_get(&port->port);
 887                         if (tty) {
 888                                 usb_serial_handle_dcd_change(port, tty,
 889                                                         status & UART_DCD);
 890                                 tty_kref_put(tty);
 891                         }
 892                 }
 893
 894                 wake_up_interruptible(&port->port.delta_msr_wait);
 895         }
 896 }
 897
 898 static void pl2303_read_int_callback(struct urb *urb)
 899 {
 900         struct usb_serial_port *port =  urb->context;
 901         unsigned char *data = urb->transfer_buffer;
 902         unsigned int actual_length = urb->actual_length;
 903         int status = urb->status;
 904         int retval;
 905
 906         switch (status) {
 907         case 0:
 908                 /* success */
 909                 break;
 910         case -ECONNRESET:
 911         case -ENOENT:
 912         case -ESHUTDOWN:
 913                 /* this urb is terminated, clean up */
 914                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
 915                         __func__, status);
 916                 return;
 917         default:
 918                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
 919                         __func__, status);
 920                 goto exit;
 921         }
 922
 923         usb_serial_debug_data(&port->dev, __func__,
 924                               urb->actual_length, urb->transfer_buffer);
 925
 926         pl2303_update_line_status(port, data, actual_length);
 927
 928 exit:
 929         retval = usb_submit_urb(urb, GFP_ATOMIC);
 930         if (retval) {
 931                 dev_err(&port->dev,
 932                         "%s - usb_submit_urb failed with result %d\n",
 933                         __func__, retval);
 934         }
 935 }
 936
 937 static void pl2303_process_read_urb(struct urb *urb)
 938 {
 939         struct usb_serial_port *port = urb->context;
 940         struct pl2303_private *priv = usb_get_serial_port_data(port);
 941         unsigned char *data = urb->transfer_buffer;
 942         char tty_flag = TTY_NORMAL;
 943         unsigned long flags;
 944         u8 line_status;
 945         int i;
 946
 947         /* update line status */
 948         spin_lock_irqsave(&priv->lock, flags);
 949         line_status = priv->line_status;
 950         priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
 951         spin_unlock_irqrestore(&priv->lock, flags);
 952
 953         if (!urb->actual_length)
 954                 return;
 955
 956         /*
 957          * Break takes precedence over parity, which takes precedence over
 958          * framing errors.
 959          */
 960         if (line_status & UART_BREAK_ERROR)
 961                 tty_flag = TTY_BREAK;
 962         else if (line_status & UART_PARITY_ERROR)
 963                 tty_flag = TTY_PARITY;
 964         else if (line_status & UART_FRAME_ERROR)
 965                 tty_flag = TTY_FRAME;
 966
 967         if (tty_flag != TTY_NORMAL)
 968                 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
 969                                                                 tty_flag);
 970         /* overrun is special, not associated with a char */
 971         if (line_status & UART_OVERRUN_ERROR)
 972                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 973
 974         if (port->port.console && port->sysrq) {
 975                 for (i = 0; i < urb->actual_length; ++i)
 976                         if (!usb_serial_handle_sysrq_char(port, data[i]))
 977                                 tty_insert_flip_char(&port->port, data[i],
 978                                                 tty_flag);
 979         } else {
 980                 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
 981                                                         urb->actual_length);
 982         }
 983
 984         tty_flip_buffer_push(&port->port);
 985 }
 986
 987 static struct usb_serial_driver pl2303_device = {
 988         .driver = {
 989                 .owner =        THIS_MODULE,
 990                 .name =         "pl2303",
 991         },
 992         .id_table =             id_table,
 993         .num_bulk_in =          1,
 994         .num_bulk_out =         1,
 995         .num_interrupt_in =     0,      /* see pl2303_calc_num_ports */
 996         .bulk_in_size =         256,
 997         .bulk_out_size =        256,
 998         .open =                 pl2303_open,
 999         .close =                pl2303_close,
1000         .dtr_rts =              pl2303_dtr_rts,
1001         .carrier_raised =       pl2303_carrier_raised,
1002         .ioctl =                pl2303_ioctl,
1003         .break_ctl =            pl2303_break_ctl,
1004         .set_termios =          pl2303_set_termios,
1005         .tiocmget =             pl2303_tiocmget,
1006         .tiocmset =             pl2303_tiocmset,
1007         .tiocmiwait =           usb_serial_generic_tiocmiwait,
1008         .process_read_urb =     pl2303_process_read_urb,
1009         .read_int_callback =    pl2303_read_int_callback,
1010         .probe =                pl2303_probe,
1011         .calc_num_ports =       pl2303_calc_num_ports,
1012         .attach =               pl2303_startup,
1013         .release =              pl2303_release,
1014         .port_probe =           pl2303_port_probe,
1015         .port_remove =          pl2303_port_remove,
1016 };
1017
1018 static struct usb_serial_driver * const serial_drivers[] = {
1019         &pl2303_device, NULL
1020 };
1021
1022 module_usb_serial_driver(serial_drivers, id_table);
1023
1024 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
1025 MODULE_LICENSE("GPL v2");