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 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 baseline, mantissa, exponent; 366 367 /* 368 * Apparently the formula is: 369 * baudrate = 12M * 32 / (mantissa * 4^exponent) 370 * where 371 * mantissa = buf[8:0] 372 * exponent = buf[11:9] 373 */ 374 baseline = 12000000 * 32; 375 mantissa = baseline / baud; 376 if (mantissa == 0) 377 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */ 378 exponent = 0; 379 while (mantissa >= 512) { 380 if (exponent < 7) { 381 mantissa >>= 2; /* divide by 4 */ 382 exponent++; 383 } else { 384 /* Exponent is maxed. Trim mantissa and leave. */ 385 mantissa = 511; 386 break; 387 } 388 } 389 390 buf[3] = 0x80; 391 buf[2] = 0; 392 buf[1] = exponent << 1 | mantissa >> 8; 393 buf[0] = mantissa & 0xff; 394 395 /* Calculate and return the exact baud rate. */ 396 baud = (baseline / mantissa) >> (exponent << 1); 397 398 return baud; 399 } 400 401 static void pl2303_encode_baud_rate(struct tty_struct *tty, 402 struct usb_serial_port *port, 403 u8 buf[4]) 404 { 405 struct usb_serial *serial = port->serial; 406 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 407 speed_t baud_sup; 408 speed_t baud; 409 410 baud = tty_get_baud_rate(tty); 411 dev_dbg(&port->dev, "baud requested = %u\n", baud); 412 if (!baud) 413 return; 414 415 if (spriv->type->max_baud_rate) 416 baud = min_t(speed_t, baud, spriv->type->max_baud_rate); 417 /* 418 * Use direct method for supported baud rates, otherwise use divisors. 419 */ 420 baud_sup = pl2303_get_supported_baud_rate(baud); 421 422 if (baud == baud_sup) 423 baud = pl2303_encode_baud_rate_direct(buf, baud); 424 else 425 baud = pl2303_encode_baud_rate_divisor(buf, baud); 426 427 /* Save resulting baud rate */ 428 tty_encode_baud_rate(tty, baud, baud); 429 dev_dbg(&port->dev, "baud set = %u\n", baud); 430 } 431 432 static int pl2303_get_line_request(struct usb_serial_port *port, 433 unsigned char buf[7]) 434 { 435 struct usb_device *udev = port->serial->dev; 436 int ret; 437 438 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 439 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, 440 0, 0, buf, 7, 100); 441 if (ret != 7) { 442 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 443 444 if (ret > 0) 445 ret = -EIO; 446 447 return ret; 448 } 449 450 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 451 452 return 0; 453 } 454 455 static int pl2303_set_line_request(struct usb_serial_port *port, 456 unsigned char buf[7]) 457 { 458 struct usb_device *udev = port->serial->dev; 459 int ret; 460 461 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 462 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE, 463 0, 0, buf, 7, 100); 464 if (ret != 7) { 465 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 466 467 if (ret > 0) 468 ret = -EIO; 469 470 return ret; 471 } 472 473 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 474 475 return 0; 476 } 477 478 static void pl2303_set_termios(struct tty_struct *tty, 479 struct usb_serial_port *port, struct ktermios *old_termios) 480 { 481 struct usb_serial *serial = port->serial; 482 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 483 struct pl2303_private *priv = usb_get_serial_port_data(port); 484 unsigned long flags; 485 unsigned char *buf; 486 int ret; 487 u8 control; 488 489 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios)) 490 return; 491 492 buf = kzalloc(7, GFP_KERNEL); 493 if (!buf) { 494 /* Report back no change occurred */ 495 if (old_termios) 496 tty->termios = *old_termios; 497 return; 498 } 499 500 pl2303_get_line_request(port, buf); 501 502 switch (C_CSIZE(tty)) { 503 case CS5: 504 buf[6] = 5; 505 break; 506 case CS6: 507 buf[6] = 6; 508 break; 509 case CS7: 510 buf[6] = 7; 511 break; 512 default: 513 case CS8: 514 buf[6] = 8; 515 } 516 dev_dbg(&port->dev, "data bits = %d\n", buf[6]); 517 518 /* For reference buf[0]:buf[3] baud rate value */ 519 pl2303_encode_baud_rate(tty, port, &buf[0]); 520 521 /* For reference buf[4]=0 is 1 stop bits */ 522 /* For reference buf[4]=1 is 1.5 stop bits */ 523 /* For reference buf[4]=2 is 2 stop bits */ 524 if (C_CSTOPB(tty)) { 525 /* 526 * NOTE: Comply with "real" UARTs / RS232: 527 * use 1.5 instead of 2 stop bits with 5 data bits 528 */ 529 if (C_CSIZE(tty) == CS5) { 530 buf[4] = 1; 531 dev_dbg(&port->dev, "stop bits = 1.5\n"); 532 } else { 533 buf[4] = 2; 534 dev_dbg(&port->dev, "stop bits = 2\n"); 535 } 536 } else { 537 buf[4] = 0; 538 dev_dbg(&port->dev, "stop bits = 1\n"); 539 } 540 541 if (C_PARENB(tty)) { 542 /* For reference buf[5]=0 is none parity */ 543 /* For reference buf[5]=1 is odd parity */ 544 /* For reference buf[5]=2 is even parity */ 545 /* For reference buf[5]=3 is mark parity */ 546 /* For reference buf[5]=4 is space parity */ 547 if (C_PARODD(tty)) { 548 if (C_CMSPAR(tty)) { 549 buf[5] = 3; 550 dev_dbg(&port->dev, "parity = mark\n"); 551 } else { 552 buf[5] = 1; 553 dev_dbg(&port->dev, "parity = odd\n"); 554 } 555 } else { 556 if (C_CMSPAR(tty)) { 557 buf[5] = 4; 558 dev_dbg(&port->dev, "parity = space\n"); 559 } else { 560 buf[5] = 2; 561 dev_dbg(&port->dev, "parity = even\n"); 562 } 563 } 564 } else { 565 buf[5] = 0; 566 dev_dbg(&port->dev, "parity = none\n"); 567 } 568 569 /* 570 * Some PL2303 are known to lose bytes if you change serial settings 571 * even to the same values as before. Thus we actually need to filter 572 * in this specific case. 573 * 574 * Note that the tty_termios_hw_change check above is not sufficient 575 * as a previously requested baud rate may differ from the one 576 * actually used (and stored in old_termios). 577 * 578 * NOTE: No additional locking needed for line_settings as it is 579 * only used in set_termios, which is serialised against itself. 580 */ 581 if (!old_termios || memcmp(buf, priv->line_settings, 7)) { 582 ret = pl2303_set_line_request(port, buf); 583 if (!ret) 584 memcpy(priv->line_settings, buf, 7); 585 } 586 587 /* change control lines if we are switching to or from B0 */ 588 spin_lock_irqsave(&priv->lock, flags); 589 control = priv->line_control; 590 if (C_BAUD(tty) == B0) 591 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 592 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) 593 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 594 if (control != priv->line_control) { 595 control = priv->line_control; 596 spin_unlock_irqrestore(&priv->lock, flags); 597 pl2303_set_control_lines(port, control); 598 } else { 599 spin_unlock_irqrestore(&priv->lock, flags); 600 } 601 602 if (C_CRTSCTS(tty)) { 603 if (spriv->quirks & PL2303_QUIRK_LEGACY) 604 pl2303_vendor_write(serial, 0x0, 0x41); 605 else 606 pl2303_vendor_write(serial, 0x0, 0x61); 607 } else { 608 pl2303_vendor_write(serial, 0x0, 0x0); 609 } 610 611 kfree(buf); 612 } 613 614 static void pl2303_dtr_rts(struct usb_serial_port *port, int on) 615 { 616 struct pl2303_private *priv = usb_get_serial_port_data(port); 617 unsigned long flags; 618 u8 control; 619 620 spin_lock_irqsave(&priv->lock, flags); 621 if (on) 622 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 623 else 624 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 625 control = priv->line_control; 626 spin_unlock_irqrestore(&priv->lock, flags); 627 628 pl2303_set_control_lines(port, control); 629 } 630 631 static void pl2303_close(struct usb_serial_port *port) 632 { 633 usb_serial_generic_close(port); 634 usb_kill_urb(port->interrupt_in_urb); 635 pl2303_set_break(port, false); 636 } 637 638 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port) 639 { 640 struct usb_serial *serial = port->serial; 641 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 642 int result; 643 644 if (spriv->quirks & PL2303_QUIRK_LEGACY) { 645 usb_clear_halt(serial->dev, port->write_urb->pipe); 646 usb_clear_halt(serial->dev, port->read_urb->pipe); 647 } else { 648 /* reset upstream data pipes */ 649 pl2303_vendor_write(serial, 8, 0); 650 pl2303_vendor_write(serial, 9, 0); 651 } 652 653 /* Setup termios */ 654 if (tty) 655 pl2303_set_termios(tty, port, NULL); 656 657 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 658 if (result) { 659 dev_err(&port->dev, "failed to submit interrupt urb: %d\n", 660 result); 661 return result; 662 } 663 664 result = usb_serial_generic_open(tty, port); 665 if (result) { 666 usb_kill_urb(port->interrupt_in_urb); 667 return result; 668 } 669 670 return 0; 671 } 672 673 static int pl2303_tiocmset(struct tty_struct *tty, 674 unsigned int set, unsigned int clear) 675 { 676 struct usb_serial_port *port = tty->driver_data; 677 struct pl2303_private *priv = usb_get_serial_port_data(port); 678 unsigned long flags; 679 u8 control; 680 int ret; 681 682 spin_lock_irqsave(&priv->lock, flags); 683 if (set & TIOCM_RTS) 684 priv->line_control |= CONTROL_RTS; 685 if (set & TIOCM_DTR) 686 priv->line_control |= CONTROL_DTR; 687 if (clear & TIOCM_RTS) 688 priv->line_control &= ~CONTROL_RTS; 689 if (clear & TIOCM_DTR) 690 priv->line_control &= ~CONTROL_DTR; 691 control = priv->line_control; 692 spin_unlock_irqrestore(&priv->lock, flags); 693 694 ret = pl2303_set_control_lines(port, control); 695 if (ret) 696 return usb_translate_errors(ret); 697 698 return 0; 699 } 700 701 static int pl2303_tiocmget(struct tty_struct *tty) 702 { 703 struct usb_serial_port *port = tty->driver_data; 704 struct pl2303_private *priv = usb_get_serial_port_data(port); 705 unsigned long flags; 706 unsigned int mcr; 707 unsigned int status; 708 unsigned int result; 709 710 spin_lock_irqsave(&priv->lock, flags); 711 mcr = priv->line_control; 712 status = priv->line_status; 713 spin_unlock_irqrestore(&priv->lock, flags); 714 715 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0) 716 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0) 717 | ((status & UART_CTS) ? TIOCM_CTS : 0) 718 | ((status & UART_DSR) ? TIOCM_DSR : 0) 719 | ((status & UART_RING) ? TIOCM_RI : 0) 720 | ((status & UART_DCD) ? TIOCM_CD : 0); 721 722 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); 723 724 return result; 725 } 726 727 static int pl2303_carrier_raised(struct usb_serial_port *port) 728 { 729 struct pl2303_private *priv = usb_get_serial_port_data(port); 730 731 if (priv->line_status & UART_DCD) 732 return 1; 733 734 return 0; 735 } 736 737 static int pl2303_ioctl(struct tty_struct *tty, 738 unsigned int cmd, unsigned long arg) 739 { 740 struct serial_struct ser; 741 struct usb_serial_port *port = tty->driver_data; 742 743 switch (cmd) { 744 case TIOCGSERIAL: 745 memset(&ser, 0, sizeof ser); 746 ser.type = PORT_16654; 747 ser.line = port->minor; 748 ser.port = port->port_number; 749 ser.baud_base = 460800; 750 751 if (copy_to_user((void __user *)arg, &ser, sizeof ser)) 752 return -EFAULT; 753 754 return 0; 755 default: 756 break; 757 } 758 759 return -ENOIOCTLCMD; 760 } 761 762 static void pl2303_set_break(struct usb_serial_port *port, bool enable) 763 { 764 struct usb_serial *serial = port->serial; 765 u16 state; 766 int result; 767 768 if (enable) 769 state = BREAK_ON; 770 else 771 state = BREAK_OFF; 772 773 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 774 state == BREAK_OFF ? "off" : "on"); 775 776 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 777 BREAK_REQUEST, BREAK_REQUEST_TYPE, state, 778 0, NULL, 0, 100); 779 if (result) 780 dev_err(&port->dev, "error sending break = %d\n", result); 781 } 782 783 static void pl2303_break_ctl(struct tty_struct *tty, int state) 784 { 785 struct usb_serial_port *port = tty->driver_data; 786 787 pl2303_set_break(port, state); 788 } 789 790 static void pl2303_update_line_status(struct usb_serial_port *port, 791 unsigned char *data, 792 unsigned int actual_length) 793 { 794 struct usb_serial *serial = port->serial; 795 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 796 struct pl2303_private *priv = usb_get_serial_port_data(port); 797 struct tty_struct *tty; 798 unsigned long flags; 799 unsigned int status_idx = UART_STATE_INDEX; 800 u8 status; 801 u8 delta; 802 803 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0) 804 status_idx = 0; 805 806 if (actual_length < status_idx + 1) 807 return; 808 809 status = data[status_idx]; 810 811 /* Save off the uart status for others to look at */ 812 spin_lock_irqsave(&priv->lock, flags); 813 delta = priv->line_status ^ status; 814 priv->line_status = status; 815 spin_unlock_irqrestore(&priv->lock, flags); 816 817 if (status & UART_BREAK_ERROR) 818 usb_serial_handle_break(port); 819 820 if (delta & UART_STATE_MSR_MASK) { 821 if (delta & UART_CTS) 822 port->icount.cts++; 823 if (delta & UART_DSR) 824 port->icount.dsr++; 825 if (delta & UART_RING) 826 port->icount.rng++; 827 if (delta & UART_DCD) { 828 port->icount.dcd++; 829 tty = tty_port_tty_get(&port->port); 830 if (tty) { 831 usb_serial_handle_dcd_change(port, tty, 832 status & UART_DCD); 833 tty_kref_put(tty); 834 } 835 } 836 837 wake_up_interruptible(&port->port.delta_msr_wait); 838 } 839 } 840 841 static void pl2303_read_int_callback(struct urb *urb) 842 { 843 struct usb_serial_port *port = urb->context; 844 unsigned char *data = urb->transfer_buffer; 845 unsigned int actual_length = urb->actual_length; 846 int status = urb->status; 847 int retval; 848 849 switch (status) { 850 case 0: 851 /* success */ 852 break; 853 case -ECONNRESET: 854 case -ENOENT: 855 case -ESHUTDOWN: 856 /* this urb is terminated, clean up */ 857 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", 858 __func__, status); 859 return; 860 default: 861 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", 862 __func__, status); 863 goto exit; 864 } 865 866 usb_serial_debug_data(&port->dev, __func__, 867 urb->actual_length, urb->transfer_buffer); 868 869 pl2303_update_line_status(port, data, actual_length); 870 871 exit: 872 retval = usb_submit_urb(urb, GFP_ATOMIC); 873 if (retval) { 874 dev_err(&port->dev, 875 "%s - usb_submit_urb failed with result %d\n", 876 __func__, retval); 877 } 878 } 879 880 static void pl2303_process_read_urb(struct urb *urb) 881 { 882 struct usb_serial_port *port = urb->context; 883 struct pl2303_private *priv = usb_get_serial_port_data(port); 884 unsigned char *data = urb->transfer_buffer; 885 char tty_flag = TTY_NORMAL; 886 unsigned long flags; 887 u8 line_status; 888 int i; 889 890 /* update line status */ 891 spin_lock_irqsave(&priv->lock, flags); 892 line_status = priv->line_status; 893 priv->line_status &= ~UART_STATE_TRANSIENT_MASK; 894 spin_unlock_irqrestore(&priv->lock, flags); 895 896 if (!urb->actual_length) 897 return; 898 899 /* 900 * Break takes precedence over parity, which takes precedence over 901 * framing errors. 902 */ 903 if (line_status & UART_BREAK_ERROR) 904 tty_flag = TTY_BREAK; 905 else if (line_status & UART_PARITY_ERROR) 906 tty_flag = TTY_PARITY; 907 else if (line_status & UART_FRAME_ERROR) 908 tty_flag = TTY_FRAME; 909 910 if (tty_flag != TTY_NORMAL) 911 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, 912 tty_flag); 913 /* overrun is special, not associated with a char */ 914 if (line_status & UART_OVERRUN_ERROR) 915 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 916 917 if (port->port.console && port->sysrq) { 918 for (i = 0; i < urb->actual_length; ++i) 919 if (!usb_serial_handle_sysrq_char(port, data[i])) 920 tty_insert_flip_char(&port->port, data[i], 921 tty_flag); 922 } else { 923 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag, 924 urb->actual_length); 925 } 926 927 tty_flip_buffer_push(&port->port); 928 } 929 930 static struct usb_serial_driver pl2303_device = { 931 .driver = { 932 .owner = THIS_MODULE, 933 .name = "pl2303", 934 }, 935 .id_table = id_table, 936 .num_ports = 1, 937 .bulk_in_size = 256, 938 .bulk_out_size = 256, 939 .open = pl2303_open, 940 .close = pl2303_close, 941 .dtr_rts = pl2303_dtr_rts, 942 .carrier_raised = pl2303_carrier_raised, 943 .ioctl = pl2303_ioctl, 944 .break_ctl = pl2303_break_ctl, 945 .set_termios = pl2303_set_termios, 946 .tiocmget = pl2303_tiocmget, 947 .tiocmset = pl2303_tiocmset, 948 .tiocmiwait = usb_serial_generic_tiocmiwait, 949 .process_read_urb = pl2303_process_read_urb, 950 .read_int_callback = pl2303_read_int_callback, 951 .probe = pl2303_probe, 952 .attach = pl2303_startup, 953 .release = pl2303_release, 954 .port_probe = pl2303_port_probe, 955 .port_remove = pl2303_port_remove, 956 }; 957 958 static struct usb_serial_driver * const serial_drivers[] = { 959 &pl2303_device, NULL 960 }; 961 962 module_usb_serial_driver(serial_drivers, id_table); 963 964 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver"); 965 MODULE_LICENSE("GPL"); 966