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