1 /* 2 * Prolific PL2303 USB to serial adaptor driver 3 * 4 * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com) 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(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) }, 49 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) }, 50 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) }, 51 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) }, 52 { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) }, 53 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) }, 54 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) }, 55 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) }, 56 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) }, 57 { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) }, 58 { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) }, 59 { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) }, 60 { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) }, 61 { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) }, 62 { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) }, 63 { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_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 static void pl2303_set_break(struct usb_serial_port *port, bool enable); 135 136 enum pl2303_type { 137 TYPE_01, /* Type 0 and 1 (difference unknown) */ 138 TYPE_HX, /* HX version of the pl2303 chip */ 139 TYPE_COUNT 140 }; 141 142 struct pl2303_type_data { 143 speed_t max_baud_rate; 144 unsigned long quirks; 145 }; 146 147 struct pl2303_serial_private { 148 const struct pl2303_type_data *type; 149 unsigned long quirks; 150 }; 151 152 struct pl2303_private { 153 spinlock_t lock; 154 u8 line_control; 155 u8 line_status; 156 157 u8 line_settings[7]; 158 }; 159 160 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = { 161 [TYPE_01] = { 162 .max_baud_rate = 1228800, 163 .quirks = PL2303_QUIRK_LEGACY, 164 }, 165 [TYPE_HX] = { 166 .max_baud_rate = 12000000, 167 }, 168 }; 169 170 static int pl2303_vendor_read(struct usb_serial *serial, u16 value, 171 unsigned char buf[1]) 172 { 173 struct device *dev = &serial->interface->dev; 174 int res; 175 176 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 177 VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE, 178 value, 0, buf, 1, 100); 179 if (res != 1) { 180 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__, 181 value, res); 182 if (res >= 0) 183 res = -EIO; 184 185 return res; 186 } 187 188 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]); 189 190 return 0; 191 } 192 193 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index) 194 { 195 struct device *dev = &serial->interface->dev; 196 int res; 197 198 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index); 199 200 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 201 VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE, 202 value, index, NULL, 0, 100); 203 if (res) { 204 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__, 205 value, res); 206 return res; 207 } 208 209 return 0; 210 } 211 212 static int pl2303_probe(struct usb_serial *serial, 213 const struct usb_device_id *id) 214 { 215 usb_set_serial_data(serial, (void *)id->driver_info); 216 217 return 0; 218 } 219 220 static int pl2303_startup(struct usb_serial *serial) 221 { 222 struct pl2303_serial_private *spriv; 223 unsigned char num_ports = serial->num_ports; 224 enum pl2303_type type = TYPE_01; 225 unsigned char *buf; 226 227 if (serial->num_bulk_in < num_ports || 228 serial->num_bulk_out < num_ports || 229 serial->num_interrupt_in < num_ports) { 230 dev_err(&serial->interface->dev, "missing endpoints\n"); 231 return -ENODEV; 232 } 233 234 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL); 235 if (!spriv) 236 return -ENOMEM; 237 238 buf = kmalloc(1, GFP_KERNEL); 239 if (!buf) { 240 kfree(spriv); 241 return -ENOMEM; 242 } 243 244 if (serial->dev->descriptor.bDeviceClass == 0x02) 245 type = TYPE_01; /* type 0 */ 246 else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40) 247 type = TYPE_HX; 248 else if (serial->dev->descriptor.bDeviceClass == 0x00) 249 type = TYPE_01; /* type 1 */ 250 else if (serial->dev->descriptor.bDeviceClass == 0xFF) 251 type = TYPE_01; /* type 1 */ 252 dev_dbg(&serial->interface->dev, "device type: %d\n", type); 253 254 spriv->type = &pl2303_type_data[type]; 255 spriv->quirks = (unsigned long)usb_get_serial_data(serial); 256 spriv->quirks |= spriv->type->quirks; 257 258 usb_set_serial_data(serial, spriv); 259 260 pl2303_vendor_read(serial, 0x8484, buf); 261 pl2303_vendor_write(serial, 0x0404, 0); 262 pl2303_vendor_read(serial, 0x8484, buf); 263 pl2303_vendor_read(serial, 0x8383, buf); 264 pl2303_vendor_read(serial, 0x8484, buf); 265 pl2303_vendor_write(serial, 0x0404, 1); 266 pl2303_vendor_read(serial, 0x8484, buf); 267 pl2303_vendor_read(serial, 0x8383, buf); 268 pl2303_vendor_write(serial, 0, 1); 269 pl2303_vendor_write(serial, 1, 0); 270 if (spriv->quirks & PL2303_QUIRK_LEGACY) 271 pl2303_vendor_write(serial, 2, 0x24); 272 else 273 pl2303_vendor_write(serial, 2, 0x44); 274 275 kfree(buf); 276 277 return 0; 278 } 279 280 static void pl2303_release(struct usb_serial *serial) 281 { 282 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 283 284 kfree(spriv); 285 } 286 287 static int pl2303_port_probe(struct usb_serial_port *port) 288 { 289 struct pl2303_private *priv; 290 291 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 292 if (!priv) 293 return -ENOMEM; 294 295 spin_lock_init(&priv->lock); 296 297 usb_set_serial_port_data(port, priv); 298 299 port->port.drain_delay = 256; 300 301 return 0; 302 } 303 304 static int pl2303_port_remove(struct usb_serial_port *port) 305 { 306 struct pl2303_private *priv = usb_get_serial_port_data(port); 307 308 kfree(priv); 309 310 return 0; 311 } 312 313 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value) 314 { 315 struct usb_device *dev = port->serial->dev; 316 int retval; 317 318 dev_dbg(&port->dev, "%s - %02x\n", __func__, value); 319 320 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 321 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE, 322 value, 0, NULL, 0, 100); 323 if (retval) 324 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval); 325 326 return retval; 327 } 328 329 /* 330 * Returns the nearest supported baud rate that can be set directly without 331 * using divisors. 332 */ 333 static speed_t pl2303_get_supported_baud_rate(speed_t baud) 334 { 335 static const speed_t baud_sup[] = { 336 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600, 337 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800, 338 614400, 921600, 1228800, 2457600, 3000000, 6000000 339 }; 340 341 unsigned i; 342 343 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) { 344 if (baud_sup[i] > baud) 345 break; 346 } 347 348 if (i == ARRAY_SIZE(baud_sup)) 349 baud = baud_sup[i - 1]; 350 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1])) 351 baud = baud_sup[i - 1]; 352 else 353 baud = baud_sup[i]; 354 355 return baud; 356 } 357 358 /* 359 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to 360 * use 9600 baud. 361 */ 362 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4], 363 speed_t baud) 364 { 365 put_unaligned_le32(baud, buf); 366 367 return baud; 368 } 369 370 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4], 371 speed_t baud) 372 { 373 unsigned int baseline, mantissa, exponent; 374 375 /* 376 * Apparently the formula is: 377 * baudrate = 12M * 32 / (mantissa * 4^exponent) 378 * where 379 * mantissa = buf[8:0] 380 * exponent = buf[11:9] 381 */ 382 baseline = 12000000 * 32; 383 mantissa = baseline / baud; 384 if (mantissa == 0) 385 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */ 386 exponent = 0; 387 while (mantissa >= 512) { 388 if (exponent < 7) { 389 mantissa >>= 2; /* divide by 4 */ 390 exponent++; 391 } else { 392 /* Exponent is maxed. Trim mantissa and leave. */ 393 mantissa = 511; 394 break; 395 } 396 } 397 398 buf[3] = 0x80; 399 buf[2] = 0; 400 buf[1] = exponent << 1 | mantissa >> 8; 401 buf[0] = mantissa & 0xff; 402 403 /* Calculate and return the exact baud rate. */ 404 baud = (baseline / mantissa) >> (exponent << 1); 405 406 return baud; 407 } 408 409 static void pl2303_encode_baud_rate(struct tty_struct *tty, 410 struct usb_serial_port *port, 411 u8 buf[4]) 412 { 413 struct usb_serial *serial = port->serial; 414 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 415 speed_t baud_sup; 416 speed_t baud; 417 418 baud = tty_get_baud_rate(tty); 419 dev_dbg(&port->dev, "baud requested = %u\n", baud); 420 if (!baud) 421 return; 422 423 if (spriv->type->max_baud_rate) 424 baud = min_t(speed_t, baud, spriv->type->max_baud_rate); 425 /* 426 * Use direct method for supported baud rates, otherwise use divisors. 427 */ 428 baud_sup = pl2303_get_supported_baud_rate(baud); 429 430 if (baud == baud_sup) 431 baud = pl2303_encode_baud_rate_direct(buf, baud); 432 else 433 baud = pl2303_encode_baud_rate_divisor(buf, baud); 434 435 /* Save resulting baud rate */ 436 tty_encode_baud_rate(tty, baud, baud); 437 dev_dbg(&port->dev, "baud set = %u\n", baud); 438 } 439 440 static int pl2303_get_line_request(struct usb_serial_port *port, 441 unsigned char buf[7]) 442 { 443 struct usb_device *udev = port->serial->dev; 444 int ret; 445 446 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 447 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, 448 0, 0, buf, 7, 100); 449 if (ret != 7) { 450 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 451 452 if (ret > 0) 453 ret = -EIO; 454 455 return ret; 456 } 457 458 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 459 460 return 0; 461 } 462 463 static int pl2303_set_line_request(struct usb_serial_port *port, 464 unsigned char buf[7]) 465 { 466 struct usb_device *udev = port->serial->dev; 467 int ret; 468 469 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 470 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE, 471 0, 0, buf, 7, 100); 472 if (ret != 7) { 473 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 474 475 if (ret > 0) 476 ret = -EIO; 477 478 return ret; 479 } 480 481 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 482 483 return 0; 484 } 485 486 static void pl2303_set_termios(struct tty_struct *tty, 487 struct usb_serial_port *port, struct ktermios *old_termios) 488 { 489 struct usb_serial *serial = port->serial; 490 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 491 struct pl2303_private *priv = usb_get_serial_port_data(port); 492 unsigned long flags; 493 unsigned char *buf; 494 int ret; 495 u8 control; 496 497 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios)) 498 return; 499 500 buf = kzalloc(7, GFP_KERNEL); 501 if (!buf) { 502 /* Report back no change occurred */ 503 if (old_termios) 504 tty->termios = *old_termios; 505 return; 506 } 507 508 pl2303_get_line_request(port, buf); 509 510 switch (C_CSIZE(tty)) { 511 case CS5: 512 buf[6] = 5; 513 break; 514 case CS6: 515 buf[6] = 6; 516 break; 517 case CS7: 518 buf[6] = 7; 519 break; 520 default: 521 case CS8: 522 buf[6] = 8; 523 } 524 dev_dbg(&port->dev, "data bits = %d\n", buf[6]); 525 526 /* For reference buf[0]:buf[3] baud rate value */ 527 pl2303_encode_baud_rate(tty, port, &buf[0]); 528 529 /* For reference buf[4]=0 is 1 stop bits */ 530 /* For reference buf[4]=1 is 1.5 stop bits */ 531 /* For reference buf[4]=2 is 2 stop bits */ 532 if (C_CSTOPB(tty)) { 533 /* 534 * NOTE: Comply with "real" UARTs / RS232: 535 * use 1.5 instead of 2 stop bits with 5 data bits 536 */ 537 if (C_CSIZE(tty) == CS5) { 538 buf[4] = 1; 539 dev_dbg(&port->dev, "stop bits = 1.5\n"); 540 } else { 541 buf[4] = 2; 542 dev_dbg(&port->dev, "stop bits = 2\n"); 543 } 544 } else { 545 buf[4] = 0; 546 dev_dbg(&port->dev, "stop bits = 1\n"); 547 } 548 549 if (C_PARENB(tty)) { 550 /* For reference buf[5]=0 is none parity */ 551 /* For reference buf[5]=1 is odd parity */ 552 /* For reference buf[5]=2 is even parity */ 553 /* For reference buf[5]=3 is mark parity */ 554 /* For reference buf[5]=4 is space parity */ 555 if (C_PARODD(tty)) { 556 if (C_CMSPAR(tty)) { 557 buf[5] = 3; 558 dev_dbg(&port->dev, "parity = mark\n"); 559 } else { 560 buf[5] = 1; 561 dev_dbg(&port->dev, "parity = odd\n"); 562 } 563 } else { 564 if (C_CMSPAR(tty)) { 565 buf[5] = 4; 566 dev_dbg(&port->dev, "parity = space\n"); 567 } else { 568 buf[5] = 2; 569 dev_dbg(&port->dev, "parity = even\n"); 570 } 571 } 572 } else { 573 buf[5] = 0; 574 dev_dbg(&port->dev, "parity = none\n"); 575 } 576 577 /* 578 * Some PL2303 are known to lose bytes if you change serial settings 579 * even to the same values as before. Thus we actually need to filter 580 * in this specific case. 581 * 582 * Note that the tty_termios_hw_change check above is not sufficient 583 * as a previously requested baud rate may differ from the one 584 * actually used (and stored in old_termios). 585 * 586 * NOTE: No additional locking needed for line_settings as it is 587 * only used in set_termios, which is serialised against itself. 588 */ 589 if (!old_termios || memcmp(buf, priv->line_settings, 7)) { 590 ret = pl2303_set_line_request(port, buf); 591 if (!ret) 592 memcpy(priv->line_settings, buf, 7); 593 } 594 595 /* change control lines if we are switching to or from B0 */ 596 spin_lock_irqsave(&priv->lock, flags); 597 control = priv->line_control; 598 if (C_BAUD(tty) == B0) 599 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 600 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) 601 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 602 if (control != priv->line_control) { 603 control = priv->line_control; 604 spin_unlock_irqrestore(&priv->lock, flags); 605 pl2303_set_control_lines(port, control); 606 } else { 607 spin_unlock_irqrestore(&priv->lock, flags); 608 } 609 610 if (C_CRTSCTS(tty)) { 611 if (spriv->quirks & PL2303_QUIRK_LEGACY) 612 pl2303_vendor_write(serial, 0x0, 0x41); 613 else 614 pl2303_vendor_write(serial, 0x0, 0x61); 615 } else { 616 pl2303_vendor_write(serial, 0x0, 0x0); 617 } 618 619 kfree(buf); 620 } 621 622 static void pl2303_dtr_rts(struct usb_serial_port *port, int on) 623 { 624 struct pl2303_private *priv = usb_get_serial_port_data(port); 625 unsigned long flags; 626 u8 control; 627 628 spin_lock_irqsave(&priv->lock, flags); 629 if (on) 630 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 631 else 632 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 633 control = priv->line_control; 634 spin_unlock_irqrestore(&priv->lock, flags); 635 636 pl2303_set_control_lines(port, control); 637 } 638 639 static void pl2303_close(struct usb_serial_port *port) 640 { 641 usb_serial_generic_close(port); 642 usb_kill_urb(port->interrupt_in_urb); 643 pl2303_set_break(port, false); 644 } 645 646 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port) 647 { 648 struct usb_serial *serial = port->serial; 649 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 650 int result; 651 652 if (spriv->quirks & PL2303_QUIRK_LEGACY) { 653 usb_clear_halt(serial->dev, port->write_urb->pipe); 654 usb_clear_halt(serial->dev, port->read_urb->pipe); 655 } else { 656 /* reset upstream data pipes */ 657 pl2303_vendor_write(serial, 8, 0); 658 pl2303_vendor_write(serial, 9, 0); 659 } 660 661 /* Setup termios */ 662 if (tty) 663 pl2303_set_termios(tty, port, NULL); 664 665 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 666 if (result) { 667 dev_err(&port->dev, "failed to submit interrupt urb: %d\n", 668 result); 669 return result; 670 } 671 672 result = usb_serial_generic_open(tty, port); 673 if (result) { 674 usb_kill_urb(port->interrupt_in_urb); 675 return result; 676 } 677 678 return 0; 679 } 680 681 static int pl2303_tiocmset(struct tty_struct *tty, 682 unsigned int set, unsigned int clear) 683 { 684 struct usb_serial_port *port = tty->driver_data; 685 struct pl2303_private *priv = usb_get_serial_port_data(port); 686 unsigned long flags; 687 u8 control; 688 int ret; 689 690 spin_lock_irqsave(&priv->lock, flags); 691 if (set & TIOCM_RTS) 692 priv->line_control |= CONTROL_RTS; 693 if (set & TIOCM_DTR) 694 priv->line_control |= CONTROL_DTR; 695 if (clear & TIOCM_RTS) 696 priv->line_control &= ~CONTROL_RTS; 697 if (clear & TIOCM_DTR) 698 priv->line_control &= ~CONTROL_DTR; 699 control = priv->line_control; 700 spin_unlock_irqrestore(&priv->lock, flags); 701 702 ret = pl2303_set_control_lines(port, control); 703 if (ret) 704 return usb_translate_errors(ret); 705 706 return 0; 707 } 708 709 static int pl2303_tiocmget(struct tty_struct *tty) 710 { 711 struct usb_serial_port *port = tty->driver_data; 712 struct pl2303_private *priv = usb_get_serial_port_data(port); 713 unsigned long flags; 714 unsigned int mcr; 715 unsigned int status; 716 unsigned int result; 717 718 spin_lock_irqsave(&priv->lock, flags); 719 mcr = priv->line_control; 720 status = priv->line_status; 721 spin_unlock_irqrestore(&priv->lock, flags); 722 723 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0) 724 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0) 725 | ((status & UART_CTS) ? TIOCM_CTS : 0) 726 | ((status & UART_DSR) ? TIOCM_DSR : 0) 727 | ((status & UART_RING) ? TIOCM_RI : 0) 728 | ((status & UART_DCD) ? TIOCM_CD : 0); 729 730 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); 731 732 return result; 733 } 734 735 static int pl2303_carrier_raised(struct usb_serial_port *port) 736 { 737 struct pl2303_private *priv = usb_get_serial_port_data(port); 738 739 if (priv->line_status & UART_DCD) 740 return 1; 741 742 return 0; 743 } 744 745 static int pl2303_ioctl(struct tty_struct *tty, 746 unsigned int cmd, unsigned long arg) 747 { 748 struct serial_struct ser; 749 struct usb_serial_port *port = tty->driver_data; 750 751 switch (cmd) { 752 case TIOCGSERIAL: 753 memset(&ser, 0, sizeof ser); 754 ser.type = PORT_16654; 755 ser.line = port->minor; 756 ser.port = port->port_number; 757 ser.baud_base = 460800; 758 759 if (copy_to_user((void __user *)arg, &ser, sizeof ser)) 760 return -EFAULT; 761 762 return 0; 763 default: 764 break; 765 } 766 767 return -ENOIOCTLCMD; 768 } 769 770 static void pl2303_set_break(struct usb_serial_port *port, bool enable) 771 { 772 struct usb_serial *serial = port->serial; 773 u16 state; 774 int result; 775 776 if (enable) 777 state = BREAK_ON; 778 else 779 state = BREAK_OFF; 780 781 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 782 state == BREAK_OFF ? "off" : "on"); 783 784 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 785 BREAK_REQUEST, BREAK_REQUEST_TYPE, state, 786 0, NULL, 0, 100); 787 if (result) 788 dev_err(&port->dev, "error sending break = %d\n", result); 789 } 790 791 static void pl2303_break_ctl(struct tty_struct *tty, int state) 792 { 793 struct usb_serial_port *port = tty->driver_data; 794 795 pl2303_set_break(port, state); 796 } 797 798 static void pl2303_update_line_status(struct usb_serial_port *port, 799 unsigned char *data, 800 unsigned int actual_length) 801 { 802 struct usb_serial *serial = port->serial; 803 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 804 struct pl2303_private *priv = usb_get_serial_port_data(port); 805 struct tty_struct *tty; 806 unsigned long flags; 807 unsigned int status_idx = UART_STATE_INDEX; 808 u8 status; 809 u8 delta; 810 811 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0) 812 status_idx = 0; 813 814 if (actual_length < status_idx + 1) 815 return; 816 817 status = data[status_idx]; 818 819 /* Save off the uart status for others to look at */ 820 spin_lock_irqsave(&priv->lock, flags); 821 delta = priv->line_status ^ status; 822 priv->line_status = status; 823 spin_unlock_irqrestore(&priv->lock, flags); 824 825 if (status & UART_BREAK_ERROR) 826 usb_serial_handle_break(port); 827 828 if (delta & UART_STATE_MSR_MASK) { 829 if (delta & UART_CTS) 830 port->icount.cts++; 831 if (delta & UART_DSR) 832 port->icount.dsr++; 833 if (delta & UART_RING) 834 port->icount.rng++; 835 if (delta & UART_DCD) { 836 port->icount.dcd++; 837 tty = tty_port_tty_get(&port->port); 838 if (tty) { 839 usb_serial_handle_dcd_change(port, tty, 840 status & UART_DCD); 841 tty_kref_put(tty); 842 } 843 } 844 845 wake_up_interruptible(&port->port.delta_msr_wait); 846 } 847 } 848 849 static void pl2303_read_int_callback(struct urb *urb) 850 { 851 struct usb_serial_port *port = urb->context; 852 unsigned char *data = urb->transfer_buffer; 853 unsigned int actual_length = urb->actual_length; 854 int status = urb->status; 855 int retval; 856 857 switch (status) { 858 case 0: 859 /* success */ 860 break; 861 case -ECONNRESET: 862 case -ENOENT: 863 case -ESHUTDOWN: 864 /* this urb is terminated, clean up */ 865 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", 866 __func__, status); 867 return; 868 default: 869 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", 870 __func__, status); 871 goto exit; 872 } 873 874 usb_serial_debug_data(&port->dev, __func__, 875 urb->actual_length, urb->transfer_buffer); 876 877 pl2303_update_line_status(port, data, actual_length); 878 879 exit: 880 retval = usb_submit_urb(urb, GFP_ATOMIC); 881 if (retval) { 882 dev_err(&port->dev, 883 "%s - usb_submit_urb failed with result %d\n", 884 __func__, retval); 885 } 886 } 887 888 static void pl2303_process_read_urb(struct urb *urb) 889 { 890 struct usb_serial_port *port = urb->context; 891 struct pl2303_private *priv = usb_get_serial_port_data(port); 892 unsigned char *data = urb->transfer_buffer; 893 char tty_flag = TTY_NORMAL; 894 unsigned long flags; 895 u8 line_status; 896 int i; 897 898 /* update line status */ 899 spin_lock_irqsave(&priv->lock, flags); 900 line_status = priv->line_status; 901 priv->line_status &= ~UART_STATE_TRANSIENT_MASK; 902 spin_unlock_irqrestore(&priv->lock, flags); 903 904 if (!urb->actual_length) 905 return; 906 907 /* 908 * Break takes precedence over parity, which takes precedence over 909 * framing errors. 910 */ 911 if (line_status & UART_BREAK_ERROR) 912 tty_flag = TTY_BREAK; 913 else if (line_status & UART_PARITY_ERROR) 914 tty_flag = TTY_PARITY; 915 else if (line_status & UART_FRAME_ERROR) 916 tty_flag = TTY_FRAME; 917 918 if (tty_flag != TTY_NORMAL) 919 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, 920 tty_flag); 921 /* overrun is special, not associated with a char */ 922 if (line_status & UART_OVERRUN_ERROR) 923 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 924 925 if (port->port.console && port->sysrq) { 926 for (i = 0; i < urb->actual_length; ++i) 927 if (!usb_serial_handle_sysrq_char(port, data[i])) 928 tty_insert_flip_char(&port->port, data[i], 929 tty_flag); 930 } else { 931 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag, 932 urb->actual_length); 933 } 934 935 tty_flip_buffer_push(&port->port); 936 } 937 938 static struct usb_serial_driver pl2303_device = { 939 .driver = { 940 .owner = THIS_MODULE, 941 .name = "pl2303", 942 }, 943 .id_table = id_table, 944 .num_ports = 1, 945 .bulk_in_size = 256, 946 .bulk_out_size = 256, 947 .open = pl2303_open, 948 .close = pl2303_close, 949 .dtr_rts = pl2303_dtr_rts, 950 .carrier_raised = pl2303_carrier_raised, 951 .ioctl = pl2303_ioctl, 952 .break_ctl = pl2303_break_ctl, 953 .set_termios = pl2303_set_termios, 954 .tiocmget = pl2303_tiocmget, 955 .tiocmset = pl2303_tiocmset, 956 .tiocmiwait = usb_serial_generic_tiocmiwait, 957 .process_read_urb = pl2303_process_read_urb, 958 .read_int_callback = pl2303_read_int_callback, 959 .probe = pl2303_probe, 960 .attach = pl2303_startup, 961 .release = pl2303_release, 962 .port_probe = pl2303_port_probe, 963 .port_remove = pl2303_port_remove, 964 }; 965 966 static struct usb_serial_driver * const serial_drivers[] = { 967 &pl2303_device, NULL 968 }; 969 970 module_usb_serial_driver(serial_drivers, id_table); 971 972 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver"); 973 MODULE_LICENSE("GPL"); 974