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 < 0) { 474 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 475 return ret; 476 } 477 478 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 479 480 return 0; 481 } 482 483 static void pl2303_set_termios(struct tty_struct *tty, 484 struct usb_serial_port *port, struct ktermios *old_termios) 485 { 486 struct usb_serial *serial = port->serial; 487 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 488 struct pl2303_private *priv = usb_get_serial_port_data(port); 489 unsigned long flags; 490 unsigned char *buf; 491 int ret; 492 u8 control; 493 494 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios)) 495 return; 496 497 buf = kzalloc(7, GFP_KERNEL); 498 if (!buf) { 499 /* Report back no change occurred */ 500 if (old_termios) 501 tty->termios = *old_termios; 502 return; 503 } 504 505 pl2303_get_line_request(port, buf); 506 507 switch (C_CSIZE(tty)) { 508 case CS5: 509 buf[6] = 5; 510 break; 511 case CS6: 512 buf[6] = 6; 513 break; 514 case CS7: 515 buf[6] = 7; 516 break; 517 default: 518 case CS8: 519 buf[6] = 8; 520 } 521 dev_dbg(&port->dev, "data bits = %d\n", buf[6]); 522 523 /* For reference buf[0]:buf[3] baud rate value */ 524 pl2303_encode_baud_rate(tty, port, &buf[0]); 525 526 /* For reference buf[4]=0 is 1 stop bits */ 527 /* For reference buf[4]=1 is 1.5 stop bits */ 528 /* For reference buf[4]=2 is 2 stop bits */ 529 if (C_CSTOPB(tty)) { 530 /* 531 * NOTE: Comply with "real" UARTs / RS232: 532 * use 1.5 instead of 2 stop bits with 5 data bits 533 */ 534 if (C_CSIZE(tty) == CS5) { 535 buf[4] = 1; 536 dev_dbg(&port->dev, "stop bits = 1.5\n"); 537 } else { 538 buf[4] = 2; 539 dev_dbg(&port->dev, "stop bits = 2\n"); 540 } 541 } else { 542 buf[4] = 0; 543 dev_dbg(&port->dev, "stop bits = 1\n"); 544 } 545 546 if (C_PARENB(tty)) { 547 /* For reference buf[5]=0 is none parity */ 548 /* For reference buf[5]=1 is odd parity */ 549 /* For reference buf[5]=2 is even parity */ 550 /* For reference buf[5]=3 is mark parity */ 551 /* For reference buf[5]=4 is space parity */ 552 if (C_PARODD(tty)) { 553 if (C_CMSPAR(tty)) { 554 buf[5] = 3; 555 dev_dbg(&port->dev, "parity = mark\n"); 556 } else { 557 buf[5] = 1; 558 dev_dbg(&port->dev, "parity = odd\n"); 559 } 560 } else { 561 if (C_CMSPAR(tty)) { 562 buf[5] = 4; 563 dev_dbg(&port->dev, "parity = space\n"); 564 } else { 565 buf[5] = 2; 566 dev_dbg(&port->dev, "parity = even\n"); 567 } 568 } 569 } else { 570 buf[5] = 0; 571 dev_dbg(&port->dev, "parity = none\n"); 572 } 573 574 /* 575 * Some PL2303 are known to lose bytes if you change serial settings 576 * even to the same values as before. Thus we actually need to filter 577 * in this specific case. 578 * 579 * Note that the tty_termios_hw_change check above is not sufficient 580 * as a previously requested baud rate may differ from the one 581 * actually used (and stored in old_termios). 582 * 583 * NOTE: No additional locking needed for line_settings as it is 584 * only used in set_termios, which is serialised against itself. 585 */ 586 if (!old_termios || memcmp(buf, priv->line_settings, 7)) { 587 ret = pl2303_set_line_request(port, buf); 588 if (!ret) 589 memcpy(priv->line_settings, buf, 7); 590 } 591 592 /* change control lines if we are switching to or from B0 */ 593 spin_lock_irqsave(&priv->lock, flags); 594 control = priv->line_control; 595 if (C_BAUD(tty) == B0) 596 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 597 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) 598 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 599 if (control != priv->line_control) { 600 control = priv->line_control; 601 spin_unlock_irqrestore(&priv->lock, flags); 602 pl2303_set_control_lines(port, control); 603 } else { 604 spin_unlock_irqrestore(&priv->lock, flags); 605 } 606 607 if (C_CRTSCTS(tty)) { 608 if (spriv->quirks & PL2303_QUIRK_LEGACY) 609 pl2303_vendor_write(serial, 0x0, 0x41); 610 else 611 pl2303_vendor_write(serial, 0x0, 0x61); 612 } else { 613 pl2303_vendor_write(serial, 0x0, 0x0); 614 } 615 616 kfree(buf); 617 } 618 619 static void pl2303_dtr_rts(struct usb_serial_port *port, int on) 620 { 621 struct pl2303_private *priv = usb_get_serial_port_data(port); 622 unsigned long flags; 623 u8 control; 624 625 spin_lock_irqsave(&priv->lock, flags); 626 if (on) 627 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 628 else 629 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 630 control = priv->line_control; 631 spin_unlock_irqrestore(&priv->lock, flags); 632 633 pl2303_set_control_lines(port, control); 634 } 635 636 static void pl2303_close(struct usb_serial_port *port) 637 { 638 usb_serial_generic_close(port); 639 usb_kill_urb(port->interrupt_in_urb); 640 pl2303_set_break(port, false); 641 } 642 643 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port) 644 { 645 struct usb_serial *serial = port->serial; 646 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 647 int result; 648 649 if (spriv->quirks & PL2303_QUIRK_LEGACY) { 650 usb_clear_halt(serial->dev, port->write_urb->pipe); 651 usb_clear_halt(serial->dev, port->read_urb->pipe); 652 } else { 653 /* reset upstream data pipes */ 654 pl2303_vendor_write(serial, 8, 0); 655 pl2303_vendor_write(serial, 9, 0); 656 } 657 658 /* Setup termios */ 659 if (tty) 660 pl2303_set_termios(tty, port, NULL); 661 662 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 663 if (result) { 664 dev_err(&port->dev, "failed to submit interrupt urb: %d\n", 665 result); 666 return result; 667 } 668 669 result = usb_serial_generic_open(tty, port); 670 if (result) { 671 usb_kill_urb(port->interrupt_in_urb); 672 return result; 673 } 674 675 return 0; 676 } 677 678 static int pl2303_tiocmset(struct tty_struct *tty, 679 unsigned int set, unsigned int clear) 680 { 681 struct usb_serial_port *port = tty->driver_data; 682 struct pl2303_private *priv = usb_get_serial_port_data(port); 683 unsigned long flags; 684 u8 control; 685 int ret; 686 687 spin_lock_irqsave(&priv->lock, flags); 688 if (set & TIOCM_RTS) 689 priv->line_control |= CONTROL_RTS; 690 if (set & TIOCM_DTR) 691 priv->line_control |= CONTROL_DTR; 692 if (clear & TIOCM_RTS) 693 priv->line_control &= ~CONTROL_RTS; 694 if (clear & TIOCM_DTR) 695 priv->line_control &= ~CONTROL_DTR; 696 control = priv->line_control; 697 spin_unlock_irqrestore(&priv->lock, flags); 698 699 ret = pl2303_set_control_lines(port, control); 700 if (ret) 701 return usb_translate_errors(ret); 702 703 return 0; 704 } 705 706 static int pl2303_tiocmget(struct tty_struct *tty) 707 { 708 struct usb_serial_port *port = tty->driver_data; 709 struct pl2303_private *priv = usb_get_serial_port_data(port); 710 unsigned long flags; 711 unsigned int mcr; 712 unsigned int status; 713 unsigned int result; 714 715 spin_lock_irqsave(&priv->lock, flags); 716 mcr = priv->line_control; 717 status = priv->line_status; 718 spin_unlock_irqrestore(&priv->lock, flags); 719 720 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0) 721 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0) 722 | ((status & UART_CTS) ? TIOCM_CTS : 0) 723 | ((status & UART_DSR) ? TIOCM_DSR : 0) 724 | ((status & UART_RING) ? TIOCM_RI : 0) 725 | ((status & UART_DCD) ? TIOCM_CD : 0); 726 727 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); 728 729 return result; 730 } 731 732 static int pl2303_carrier_raised(struct usb_serial_port *port) 733 { 734 struct pl2303_private *priv = usb_get_serial_port_data(port); 735 736 if (priv->line_status & UART_DCD) 737 return 1; 738 739 return 0; 740 } 741 742 static int pl2303_ioctl(struct tty_struct *tty, 743 unsigned int cmd, unsigned long arg) 744 { 745 struct serial_struct ser; 746 struct usb_serial_port *port = tty->driver_data; 747 748 switch (cmd) { 749 case TIOCGSERIAL: 750 memset(&ser, 0, sizeof ser); 751 ser.type = PORT_16654; 752 ser.line = port->minor; 753 ser.port = port->port_number; 754 ser.baud_base = 460800; 755 756 if (copy_to_user((void __user *)arg, &ser, sizeof ser)) 757 return -EFAULT; 758 759 return 0; 760 default: 761 break; 762 } 763 764 return -ENOIOCTLCMD; 765 } 766 767 static void pl2303_set_break(struct usb_serial_port *port, bool enable) 768 { 769 struct usb_serial *serial = port->serial; 770 u16 state; 771 int result; 772 773 if (enable) 774 state = BREAK_ON; 775 else 776 state = BREAK_OFF; 777 778 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 779 state == BREAK_OFF ? "off" : "on"); 780 781 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 782 BREAK_REQUEST, BREAK_REQUEST_TYPE, state, 783 0, NULL, 0, 100); 784 if (result) 785 dev_err(&port->dev, "error sending break = %d\n", result); 786 } 787 788 static void pl2303_break_ctl(struct tty_struct *tty, int state) 789 { 790 struct usb_serial_port *port = tty->driver_data; 791 792 pl2303_set_break(port, state); 793 } 794 795 static void pl2303_update_line_status(struct usb_serial_port *port, 796 unsigned char *data, 797 unsigned int actual_length) 798 { 799 struct usb_serial *serial = port->serial; 800 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 801 struct pl2303_private *priv = usb_get_serial_port_data(port); 802 struct tty_struct *tty; 803 unsigned long flags; 804 unsigned int status_idx = UART_STATE_INDEX; 805 u8 status; 806 u8 delta; 807 808 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0) 809 status_idx = 0; 810 811 if (actual_length < status_idx + 1) 812 return; 813 814 status = data[status_idx]; 815 816 /* Save off the uart status for others to look at */ 817 spin_lock_irqsave(&priv->lock, flags); 818 delta = priv->line_status ^ status; 819 priv->line_status = status; 820 spin_unlock_irqrestore(&priv->lock, flags); 821 822 if (status & UART_BREAK_ERROR) 823 usb_serial_handle_break(port); 824 825 if (delta & UART_STATE_MSR_MASK) { 826 if (delta & UART_CTS) 827 port->icount.cts++; 828 if (delta & UART_DSR) 829 port->icount.dsr++; 830 if (delta & UART_RING) 831 port->icount.rng++; 832 if (delta & UART_DCD) { 833 port->icount.dcd++; 834 tty = tty_port_tty_get(&port->port); 835 if (tty) { 836 usb_serial_handle_dcd_change(port, tty, 837 status & UART_DCD); 838 tty_kref_put(tty); 839 } 840 } 841 842 wake_up_interruptible(&port->port.delta_msr_wait); 843 } 844 } 845 846 static void pl2303_read_int_callback(struct urb *urb) 847 { 848 struct usb_serial_port *port = urb->context; 849 unsigned char *data = urb->transfer_buffer; 850 unsigned int actual_length = urb->actual_length; 851 int status = urb->status; 852 int retval; 853 854 switch (status) { 855 case 0: 856 /* success */ 857 break; 858 case -ECONNRESET: 859 case -ENOENT: 860 case -ESHUTDOWN: 861 /* this urb is terminated, clean up */ 862 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", 863 __func__, status); 864 return; 865 default: 866 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", 867 __func__, status); 868 goto exit; 869 } 870 871 usb_serial_debug_data(&port->dev, __func__, 872 urb->actual_length, urb->transfer_buffer); 873 874 pl2303_update_line_status(port, data, actual_length); 875 876 exit: 877 retval = usb_submit_urb(urb, GFP_ATOMIC); 878 if (retval) { 879 dev_err(&port->dev, 880 "%s - usb_submit_urb failed with result %d\n", 881 __func__, retval); 882 } 883 } 884 885 static void pl2303_process_read_urb(struct urb *urb) 886 { 887 struct usb_serial_port *port = urb->context; 888 struct pl2303_private *priv = usb_get_serial_port_data(port); 889 unsigned char *data = urb->transfer_buffer; 890 char tty_flag = TTY_NORMAL; 891 unsigned long flags; 892 u8 line_status; 893 int i; 894 895 /* update line status */ 896 spin_lock_irqsave(&priv->lock, flags); 897 line_status = priv->line_status; 898 priv->line_status &= ~UART_STATE_TRANSIENT_MASK; 899 spin_unlock_irqrestore(&priv->lock, flags); 900 901 if (!urb->actual_length) 902 return; 903 904 /* 905 * Break takes precedence over parity, which takes precedence over 906 * framing errors. 907 */ 908 if (line_status & UART_BREAK_ERROR) 909 tty_flag = TTY_BREAK; 910 else if (line_status & UART_PARITY_ERROR) 911 tty_flag = TTY_PARITY; 912 else if (line_status & UART_FRAME_ERROR) 913 tty_flag = TTY_FRAME; 914 915 if (tty_flag != TTY_NORMAL) 916 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, 917 tty_flag); 918 /* overrun is special, not associated with a char */ 919 if (line_status & UART_OVERRUN_ERROR) 920 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 921 922 if (port->port.console && port->sysrq) { 923 for (i = 0; i < urb->actual_length; ++i) 924 if (!usb_serial_handle_sysrq_char(port, data[i])) 925 tty_insert_flip_char(&port->port, data[i], 926 tty_flag); 927 } else { 928 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag, 929 urb->actual_length); 930 } 931 932 tty_flip_buffer_push(&port->port); 933 } 934 935 static struct usb_serial_driver pl2303_device = { 936 .driver = { 937 .owner = THIS_MODULE, 938 .name = "pl2303", 939 }, 940 .id_table = id_table, 941 .num_ports = 1, 942 .bulk_in_size = 256, 943 .bulk_out_size = 256, 944 .open = pl2303_open, 945 .close = pl2303_close, 946 .dtr_rts = pl2303_dtr_rts, 947 .carrier_raised = pl2303_carrier_raised, 948 .ioctl = pl2303_ioctl, 949 .break_ctl = pl2303_break_ctl, 950 .set_termios = pl2303_set_termios, 951 .tiocmget = pl2303_tiocmget, 952 .tiocmset = pl2303_tiocmset, 953 .tiocmiwait = usb_serial_generic_tiocmiwait, 954 .process_read_urb = pl2303_process_read_urb, 955 .read_int_callback = pl2303_read_int_callback, 956 .probe = pl2303_probe, 957 .attach = pl2303_startup, 958 .release = pl2303_release, 959 .port_probe = pl2303_port_probe, 960 .port_remove = pl2303_port_remove, 961 }; 962 963 static struct usb_serial_driver * const serial_drivers[] = { 964 &pl2303_device, NULL 965 }; 966 967 module_usb_serial_driver(serial_drivers, id_table); 968 969 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver"); 970 MODULE_LICENSE("GPL"); 971