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(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) }, 49 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) }, 50 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) }, 51 { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) }, 52 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) }, 53 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) }, 54 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) }, 55 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) }, 56 { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) }, 57 { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) }, 58 { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) }, 59 { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) }, 60 { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) }, 61 { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) }, 62 { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) }, 63 { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_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(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) }, 87 { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) }, 88 { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) }, 89 { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) }, 90 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) }, 91 { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) }, 92 { } /* Terminating entry */ 93 }; 94 95 MODULE_DEVICE_TABLE(usb, id_table); 96 97 #define SET_LINE_REQUEST_TYPE 0x21 98 #define SET_LINE_REQUEST 0x20 99 100 #define SET_CONTROL_REQUEST_TYPE 0x21 101 #define SET_CONTROL_REQUEST 0x22 102 #define CONTROL_DTR 0x01 103 #define CONTROL_RTS 0x02 104 105 #define BREAK_REQUEST_TYPE 0x21 106 #define BREAK_REQUEST 0x23 107 #define BREAK_ON 0xffff 108 #define BREAK_OFF 0x0000 109 110 #define GET_LINE_REQUEST_TYPE 0xa1 111 #define GET_LINE_REQUEST 0x21 112 113 #define VENDOR_WRITE_REQUEST_TYPE 0x40 114 #define VENDOR_WRITE_REQUEST 0x01 115 116 #define VENDOR_READ_REQUEST_TYPE 0xc0 117 #define VENDOR_READ_REQUEST 0x01 118 119 #define UART_STATE_INDEX 8 120 #define UART_STATE_MSR_MASK 0x8b 121 #define UART_STATE_TRANSIENT_MASK 0x74 122 #define UART_DCD 0x01 123 #define UART_DSR 0x02 124 #define UART_BREAK_ERROR 0x04 125 #define UART_RING 0x08 126 #define UART_FRAME_ERROR 0x10 127 #define UART_PARITY_ERROR 0x20 128 #define UART_OVERRUN_ERROR 0x40 129 #define UART_CTS 0x80 130 131 132 enum pl2303_type { 133 TYPE_01, /* Type 0 and 1 (difference unknown) */ 134 TYPE_HX, /* HX version of the pl2303 chip */ 135 TYPE_COUNT 136 }; 137 138 struct pl2303_type_data { 139 speed_t max_baud_rate; 140 unsigned long quirks; 141 }; 142 143 struct pl2303_serial_private { 144 const struct pl2303_type_data *type; 145 unsigned long quirks; 146 }; 147 148 struct pl2303_private { 149 spinlock_t lock; 150 u8 line_control; 151 u8 line_status; 152 153 u8 line_settings[7]; 154 }; 155 156 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = { 157 [TYPE_01] = { 158 .max_baud_rate = 1228800, 159 .quirks = PL2303_QUIRK_LEGACY, 160 }, 161 }; 162 163 static int pl2303_vendor_read(struct usb_serial *serial, u16 value, 164 unsigned char buf[1]) 165 { 166 struct device *dev = &serial->interface->dev; 167 int res; 168 169 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 170 VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE, 171 value, 0, buf, 1, 100); 172 if (res != 1) { 173 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__, 174 value, res); 175 if (res >= 0) 176 res = -EIO; 177 178 return res; 179 } 180 181 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]); 182 183 return 0; 184 } 185 186 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index) 187 { 188 struct device *dev = &serial->interface->dev; 189 int res; 190 191 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index); 192 193 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 194 VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE, 195 value, index, NULL, 0, 100); 196 if (res) { 197 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__, 198 value, res); 199 return res; 200 } 201 202 return 0; 203 } 204 205 static int pl2303_probe(struct usb_serial *serial, 206 const struct usb_device_id *id) 207 { 208 usb_set_serial_data(serial, (void *)id->driver_info); 209 210 return 0; 211 } 212 213 static int pl2303_startup(struct usb_serial *serial) 214 { 215 struct pl2303_serial_private *spriv; 216 enum pl2303_type type = TYPE_01; 217 unsigned char *buf; 218 219 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL); 220 if (!spriv) 221 return -ENOMEM; 222 223 buf = kmalloc(1, GFP_KERNEL); 224 if (!buf) { 225 kfree(spriv); 226 return -ENOMEM; 227 } 228 229 if (serial->dev->descriptor.bDeviceClass == 0x02) 230 type = TYPE_01; /* type 0 */ 231 else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40) 232 type = TYPE_HX; 233 else if (serial->dev->descriptor.bDeviceClass == 0x00) 234 type = TYPE_01; /* type 1 */ 235 else if (serial->dev->descriptor.bDeviceClass == 0xFF) 236 type = TYPE_01; /* type 1 */ 237 dev_dbg(&serial->interface->dev, "device type: %d\n", type); 238 239 spriv->type = &pl2303_type_data[type]; 240 spriv->quirks = (unsigned long)usb_get_serial_data(serial); 241 spriv->quirks |= spriv->type->quirks; 242 243 usb_set_serial_data(serial, spriv); 244 245 pl2303_vendor_read(serial, 0x8484, buf); 246 pl2303_vendor_write(serial, 0x0404, 0); 247 pl2303_vendor_read(serial, 0x8484, buf); 248 pl2303_vendor_read(serial, 0x8383, buf); 249 pl2303_vendor_read(serial, 0x8484, buf); 250 pl2303_vendor_write(serial, 0x0404, 1); 251 pl2303_vendor_read(serial, 0x8484, buf); 252 pl2303_vendor_read(serial, 0x8383, buf); 253 pl2303_vendor_write(serial, 0, 1); 254 pl2303_vendor_write(serial, 1, 0); 255 if (spriv->quirks & PL2303_QUIRK_LEGACY) 256 pl2303_vendor_write(serial, 2, 0x24); 257 else 258 pl2303_vendor_write(serial, 2, 0x44); 259 260 kfree(buf); 261 262 return 0; 263 } 264 265 static void pl2303_release(struct usb_serial *serial) 266 { 267 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 268 269 kfree(spriv); 270 } 271 272 static int pl2303_port_probe(struct usb_serial_port *port) 273 { 274 struct pl2303_private *priv; 275 276 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 277 if (!priv) 278 return -ENOMEM; 279 280 spin_lock_init(&priv->lock); 281 282 usb_set_serial_port_data(port, priv); 283 284 port->port.drain_delay = 256; 285 286 return 0; 287 } 288 289 static int pl2303_port_remove(struct usb_serial_port *port) 290 { 291 struct pl2303_private *priv = usb_get_serial_port_data(port); 292 293 kfree(priv); 294 295 return 0; 296 } 297 298 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value) 299 { 300 struct usb_device *dev = port->serial->dev; 301 int retval; 302 303 dev_dbg(&port->dev, "%s - %02x\n", __func__, value); 304 305 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 306 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE, 307 value, 0, NULL, 0, 100); 308 if (retval) 309 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval); 310 311 return retval; 312 } 313 314 /* 315 * Returns the nearest supported baud rate that can be set directly without 316 * using divisors. 317 */ 318 static speed_t pl2303_get_supported_baud_rate(speed_t baud) 319 { 320 static const speed_t baud_sup[] = { 321 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600, 322 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800, 323 614400, 921600, 1228800, 2457600, 3000000, 6000000 324 }; 325 326 unsigned i; 327 328 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) { 329 if (baud_sup[i] > baud) 330 break; 331 } 332 333 if (i == ARRAY_SIZE(baud_sup)) 334 baud = baud_sup[i - 1]; 335 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1])) 336 baud = baud_sup[i - 1]; 337 else 338 baud = baud_sup[i]; 339 340 return baud; 341 } 342 343 /* 344 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to 345 * use 9600 baud. 346 */ 347 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4], 348 speed_t baud) 349 { 350 put_unaligned_le32(baud, buf); 351 352 return baud; 353 } 354 355 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4], 356 speed_t baud) 357 { 358 unsigned int tmp; 359 360 /* 361 * Apparently the formula is: 362 * baudrate = 12M * 32 / (2^buf[1]) / buf[0] 363 */ 364 tmp = 12000000 * 32 / baud; 365 buf[3] = 0x80; 366 buf[2] = 0; 367 buf[1] = (tmp >= 256); 368 while (tmp >= 256) { 369 tmp >>= 2; 370 buf[1] <<= 1; 371 } 372 buf[0] = tmp; 373 374 return baud; 375 } 376 377 static void pl2303_encode_baud_rate(struct tty_struct *tty, 378 struct usb_serial_port *port, 379 u8 buf[4]) 380 { 381 struct usb_serial *serial = port->serial; 382 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 383 speed_t baud_sup; 384 speed_t baud; 385 386 baud = tty_get_baud_rate(tty); 387 dev_dbg(&port->dev, "baud requested = %u\n", baud); 388 if (!baud) 389 return; 390 391 if (spriv->type->max_baud_rate) 392 baud = min_t(speed_t, baud, spriv->type->max_baud_rate); 393 /* 394 * Set baud rate to nearest supported value. 395 * 396 * NOTE: Baud rate 500k can only be set using divisors. 397 */ 398 baud_sup = pl2303_get_supported_baud_rate(baud); 399 400 if (baud == 500000) 401 baud = pl2303_encode_baud_rate_divisor(buf, baud); 402 else 403 baud = pl2303_encode_baud_rate_direct(buf, baud_sup); 404 405 /* Save resulting baud rate */ 406 tty_encode_baud_rate(tty, baud, baud); 407 dev_dbg(&port->dev, "baud set = %u\n", baud); 408 } 409 410 static int pl2303_get_line_request(struct usb_serial_port *port, 411 unsigned char buf[7]) 412 { 413 struct usb_device *udev = port->serial->dev; 414 int ret; 415 416 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), 417 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE, 418 0, 0, buf, 7, 100); 419 if (ret != 7) { 420 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 421 422 if (ret > 0) 423 ret = -EIO; 424 425 return ret; 426 } 427 428 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 429 430 return 0; 431 } 432 433 static int pl2303_set_line_request(struct usb_serial_port *port, 434 unsigned char buf[7]) 435 { 436 struct usb_device *udev = port->serial->dev; 437 int ret; 438 439 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 440 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE, 441 0, 0, buf, 7, 100); 442 if (ret != 7) { 443 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret); 444 445 if (ret > 0) 446 ret = -EIO; 447 448 return ret; 449 } 450 451 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf); 452 453 return 0; 454 } 455 456 static void pl2303_set_termios(struct tty_struct *tty, 457 struct usb_serial_port *port, struct ktermios *old_termios) 458 { 459 struct usb_serial *serial = port->serial; 460 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 461 struct pl2303_private *priv = usb_get_serial_port_data(port); 462 unsigned long flags; 463 unsigned char *buf; 464 int ret; 465 u8 control; 466 467 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios)) 468 return; 469 470 buf = kzalloc(7, GFP_KERNEL); 471 if (!buf) { 472 /* Report back no change occurred */ 473 if (old_termios) 474 tty->termios = *old_termios; 475 return; 476 } 477 478 pl2303_get_line_request(port, buf); 479 480 switch (C_CSIZE(tty)) { 481 case CS5: 482 buf[6] = 5; 483 break; 484 case CS6: 485 buf[6] = 6; 486 break; 487 case CS7: 488 buf[6] = 7; 489 break; 490 default: 491 case CS8: 492 buf[6] = 8; 493 } 494 dev_dbg(&port->dev, "data bits = %d\n", buf[6]); 495 496 /* For reference buf[0]:buf[3] baud rate value */ 497 pl2303_encode_baud_rate(tty, port, &buf[0]); 498 499 /* For reference buf[4]=0 is 1 stop bits */ 500 /* For reference buf[4]=1 is 1.5 stop bits */ 501 /* For reference buf[4]=2 is 2 stop bits */ 502 if (C_CSTOPB(tty)) { 503 /* 504 * NOTE: Comply with "real" UARTs / RS232: 505 * use 1.5 instead of 2 stop bits with 5 data bits 506 */ 507 if (C_CSIZE(tty) == CS5) { 508 buf[4] = 1; 509 dev_dbg(&port->dev, "stop bits = 1.5\n"); 510 } else { 511 buf[4] = 2; 512 dev_dbg(&port->dev, "stop bits = 2\n"); 513 } 514 } else { 515 buf[4] = 0; 516 dev_dbg(&port->dev, "stop bits = 1\n"); 517 } 518 519 if (C_PARENB(tty)) { 520 /* For reference buf[5]=0 is none parity */ 521 /* For reference buf[5]=1 is odd parity */ 522 /* For reference buf[5]=2 is even parity */ 523 /* For reference buf[5]=3 is mark parity */ 524 /* For reference buf[5]=4 is space parity */ 525 if (C_PARODD(tty)) { 526 if (C_CMSPAR(tty)) { 527 buf[5] = 3; 528 dev_dbg(&port->dev, "parity = mark\n"); 529 } else { 530 buf[5] = 1; 531 dev_dbg(&port->dev, "parity = odd\n"); 532 } 533 } else { 534 if (C_CMSPAR(tty)) { 535 buf[5] = 4; 536 dev_dbg(&port->dev, "parity = space\n"); 537 } else { 538 buf[5] = 2; 539 dev_dbg(&port->dev, "parity = even\n"); 540 } 541 } 542 } else { 543 buf[5] = 0; 544 dev_dbg(&port->dev, "parity = none\n"); 545 } 546 547 /* 548 * Some PL2303 are known to lose bytes if you change serial settings 549 * even to the same values as before. Thus we actually need to filter 550 * in this specific case. 551 * 552 * Note that the tty_termios_hw_change check above is not sufficient 553 * as a previously requested baud rate may differ from the one 554 * actually used (and stored in old_termios). 555 * 556 * NOTE: No additional locking needed for line_settings as it is 557 * only used in set_termios, which is serialised against itself. 558 */ 559 if (!old_termios || memcmp(buf, priv->line_settings, 7)) { 560 ret = pl2303_set_line_request(port, buf); 561 if (!ret) 562 memcpy(priv->line_settings, buf, 7); 563 } 564 565 /* change control lines if we are switching to or from B0 */ 566 spin_lock_irqsave(&priv->lock, flags); 567 control = priv->line_control; 568 if (C_BAUD(tty) == B0) 569 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 570 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0) 571 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 572 if (control != priv->line_control) { 573 control = priv->line_control; 574 spin_unlock_irqrestore(&priv->lock, flags); 575 pl2303_set_control_lines(port, control); 576 } else { 577 spin_unlock_irqrestore(&priv->lock, flags); 578 } 579 580 if (C_CRTSCTS(tty)) { 581 if (spriv->quirks & PL2303_QUIRK_LEGACY) 582 pl2303_vendor_write(serial, 0x0, 0x41); 583 else 584 pl2303_vendor_write(serial, 0x0, 0x61); 585 } else { 586 pl2303_vendor_write(serial, 0x0, 0x0); 587 } 588 589 kfree(buf); 590 } 591 592 static void pl2303_dtr_rts(struct usb_serial_port *port, int on) 593 { 594 struct pl2303_private *priv = usb_get_serial_port_data(port); 595 unsigned long flags; 596 u8 control; 597 598 spin_lock_irqsave(&priv->lock, flags); 599 if (on) 600 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 601 else 602 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 603 control = priv->line_control; 604 spin_unlock_irqrestore(&priv->lock, flags); 605 606 pl2303_set_control_lines(port, control); 607 } 608 609 static void pl2303_close(struct usb_serial_port *port) 610 { 611 usb_serial_generic_close(port); 612 usb_kill_urb(port->interrupt_in_urb); 613 } 614 615 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port) 616 { 617 struct usb_serial *serial = port->serial; 618 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 619 int result; 620 621 if (spriv->quirks & PL2303_QUIRK_LEGACY) { 622 usb_clear_halt(serial->dev, port->write_urb->pipe); 623 usb_clear_halt(serial->dev, port->read_urb->pipe); 624 } else { 625 /* reset upstream data pipes */ 626 pl2303_vendor_write(serial, 8, 0); 627 pl2303_vendor_write(serial, 9, 0); 628 } 629 630 /* Setup termios */ 631 if (tty) 632 pl2303_set_termios(tty, port, NULL); 633 634 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 635 if (result) { 636 dev_err(&port->dev, "failed to submit interrupt urb: %d\n", 637 result); 638 return result; 639 } 640 641 result = usb_serial_generic_open(tty, port); 642 if (result) { 643 usb_kill_urb(port->interrupt_in_urb); 644 return result; 645 } 646 647 return 0; 648 } 649 650 static int pl2303_tiocmset(struct tty_struct *tty, 651 unsigned int set, unsigned int clear) 652 { 653 struct usb_serial_port *port = tty->driver_data; 654 struct pl2303_private *priv = usb_get_serial_port_data(port); 655 unsigned long flags; 656 u8 control; 657 int ret; 658 659 spin_lock_irqsave(&priv->lock, flags); 660 if (set & TIOCM_RTS) 661 priv->line_control |= CONTROL_RTS; 662 if (set & TIOCM_DTR) 663 priv->line_control |= CONTROL_DTR; 664 if (clear & TIOCM_RTS) 665 priv->line_control &= ~CONTROL_RTS; 666 if (clear & TIOCM_DTR) 667 priv->line_control &= ~CONTROL_DTR; 668 control = priv->line_control; 669 spin_unlock_irqrestore(&priv->lock, flags); 670 671 ret = pl2303_set_control_lines(port, control); 672 if (ret) 673 return usb_translate_errors(ret); 674 675 return 0; 676 } 677 678 static int pl2303_tiocmget(struct tty_struct *tty) 679 { 680 struct usb_serial_port *port = tty->driver_data; 681 struct pl2303_private *priv = usb_get_serial_port_data(port); 682 unsigned long flags; 683 unsigned int mcr; 684 unsigned int status; 685 unsigned int result; 686 687 spin_lock_irqsave(&priv->lock, flags); 688 mcr = priv->line_control; 689 status = priv->line_status; 690 spin_unlock_irqrestore(&priv->lock, flags); 691 692 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0) 693 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0) 694 | ((status & UART_CTS) ? TIOCM_CTS : 0) 695 | ((status & UART_DSR) ? TIOCM_DSR : 0) 696 | ((status & UART_RING) ? TIOCM_RI : 0) 697 | ((status & UART_DCD) ? TIOCM_CD : 0); 698 699 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); 700 701 return result; 702 } 703 704 static int pl2303_carrier_raised(struct usb_serial_port *port) 705 { 706 struct pl2303_private *priv = usb_get_serial_port_data(port); 707 708 if (priv->line_status & UART_DCD) 709 return 1; 710 711 return 0; 712 } 713 714 static int pl2303_ioctl(struct tty_struct *tty, 715 unsigned int cmd, unsigned long arg) 716 { 717 struct serial_struct ser; 718 struct usb_serial_port *port = tty->driver_data; 719 720 switch (cmd) { 721 case TIOCGSERIAL: 722 memset(&ser, 0, sizeof ser); 723 ser.type = PORT_16654; 724 ser.line = port->minor; 725 ser.port = port->port_number; 726 ser.baud_base = 460800; 727 728 if (copy_to_user((void __user *)arg, &ser, sizeof ser)) 729 return -EFAULT; 730 731 return 0; 732 default: 733 break; 734 } 735 736 return -ENOIOCTLCMD; 737 } 738 739 static void pl2303_break_ctl(struct tty_struct *tty, int break_state) 740 { 741 struct usb_serial_port *port = tty->driver_data; 742 struct usb_serial *serial = port->serial; 743 u16 state; 744 int result; 745 746 if (break_state == 0) 747 state = BREAK_OFF; 748 else 749 state = BREAK_ON; 750 751 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 752 state == BREAK_OFF ? "off" : "on"); 753 754 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 755 BREAK_REQUEST, BREAK_REQUEST_TYPE, state, 756 0, NULL, 0, 100); 757 if (result) 758 dev_err(&port->dev, "error sending break = %d\n", result); 759 } 760 761 static void pl2303_update_line_status(struct usb_serial_port *port, 762 unsigned char *data, 763 unsigned int actual_length) 764 { 765 struct usb_serial *serial = port->serial; 766 struct pl2303_serial_private *spriv = usb_get_serial_data(serial); 767 struct pl2303_private *priv = usb_get_serial_port_data(port); 768 struct tty_struct *tty; 769 unsigned long flags; 770 unsigned int status_idx = UART_STATE_INDEX; 771 u8 status; 772 u8 delta; 773 774 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0) 775 status_idx = 0; 776 777 if (actual_length < status_idx + 1) 778 return; 779 780 status = data[status_idx]; 781 782 /* Save off the uart status for others to look at */ 783 spin_lock_irqsave(&priv->lock, flags); 784 delta = priv->line_status ^ status; 785 priv->line_status = status; 786 spin_unlock_irqrestore(&priv->lock, flags); 787 788 if (status & UART_BREAK_ERROR) 789 usb_serial_handle_break(port); 790 791 if (delta & UART_STATE_MSR_MASK) { 792 if (delta & UART_CTS) 793 port->icount.cts++; 794 if (delta & UART_DSR) 795 port->icount.dsr++; 796 if (delta & UART_RING) 797 port->icount.rng++; 798 if (delta & UART_DCD) { 799 port->icount.dcd++; 800 tty = tty_port_tty_get(&port->port); 801 if (tty) { 802 usb_serial_handle_dcd_change(port, tty, 803 status & UART_DCD); 804 tty_kref_put(tty); 805 } 806 } 807 808 wake_up_interruptible(&port->port.delta_msr_wait); 809 } 810 } 811 812 static void pl2303_read_int_callback(struct urb *urb) 813 { 814 struct usb_serial_port *port = urb->context; 815 unsigned char *data = urb->transfer_buffer; 816 unsigned int actual_length = urb->actual_length; 817 int status = urb->status; 818 int retval; 819 820 switch (status) { 821 case 0: 822 /* success */ 823 break; 824 case -ECONNRESET: 825 case -ENOENT: 826 case -ESHUTDOWN: 827 /* this urb is terminated, clean up */ 828 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", 829 __func__, status); 830 return; 831 default: 832 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", 833 __func__, status); 834 goto exit; 835 } 836 837 usb_serial_debug_data(&port->dev, __func__, 838 urb->actual_length, urb->transfer_buffer); 839 840 pl2303_update_line_status(port, data, actual_length); 841 842 exit: 843 retval = usb_submit_urb(urb, GFP_ATOMIC); 844 if (retval) { 845 dev_err(&port->dev, 846 "%s - usb_submit_urb failed with result %d\n", 847 __func__, retval); 848 } 849 } 850 851 static void pl2303_process_read_urb(struct urb *urb) 852 { 853 struct usb_serial_port *port = urb->context; 854 struct pl2303_private *priv = usb_get_serial_port_data(port); 855 unsigned char *data = urb->transfer_buffer; 856 char tty_flag = TTY_NORMAL; 857 unsigned long flags; 858 u8 line_status; 859 int i; 860 861 /* update line status */ 862 spin_lock_irqsave(&priv->lock, flags); 863 line_status = priv->line_status; 864 priv->line_status &= ~UART_STATE_TRANSIENT_MASK; 865 spin_unlock_irqrestore(&priv->lock, flags); 866 867 if (!urb->actual_length) 868 return; 869 870 /* 871 * Break takes precedence over parity, which takes precedence over 872 * framing errors. 873 */ 874 if (line_status & UART_BREAK_ERROR) 875 tty_flag = TTY_BREAK; 876 else if (line_status & UART_PARITY_ERROR) 877 tty_flag = TTY_PARITY; 878 else if (line_status & UART_FRAME_ERROR) 879 tty_flag = TTY_FRAME; 880 881 if (tty_flag != TTY_NORMAL) 882 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, 883 tty_flag); 884 /* overrun is special, not associated with a char */ 885 if (line_status & UART_OVERRUN_ERROR) 886 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); 887 888 if (port->port.console && port->sysrq) { 889 for (i = 0; i < urb->actual_length; ++i) 890 if (!usb_serial_handle_sysrq_char(port, data[i])) 891 tty_insert_flip_char(&port->port, data[i], 892 tty_flag); 893 } else { 894 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag, 895 urb->actual_length); 896 } 897 898 tty_flip_buffer_push(&port->port); 899 } 900 901 static struct usb_serial_driver pl2303_device = { 902 .driver = { 903 .owner = THIS_MODULE, 904 .name = "pl2303", 905 }, 906 .id_table = id_table, 907 .num_ports = 1, 908 .bulk_in_size = 256, 909 .bulk_out_size = 256, 910 .open = pl2303_open, 911 .close = pl2303_close, 912 .dtr_rts = pl2303_dtr_rts, 913 .carrier_raised = pl2303_carrier_raised, 914 .ioctl = pl2303_ioctl, 915 .break_ctl = pl2303_break_ctl, 916 .set_termios = pl2303_set_termios, 917 .tiocmget = pl2303_tiocmget, 918 .tiocmset = pl2303_tiocmset, 919 .tiocmiwait = usb_serial_generic_tiocmiwait, 920 .process_read_urb = pl2303_process_read_urb, 921 .read_int_callback = pl2303_read_int_callback, 922 .probe = pl2303_probe, 923 .attach = pl2303_startup, 924 .release = pl2303_release, 925 .port_probe = pl2303_port_probe, 926 .port_remove = pl2303_port_remove, 927 }; 928 929 static struct usb_serial_driver * const serial_drivers[] = { 930 &pl2303_device, NULL 931 }; 932 933 module_usb_serial_driver(serial_drivers, id_table); 934 935 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver"); 936 MODULE_LICENSE("GPL"); 937