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