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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
37static 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
98MODULE_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
134static void pl2303_set_break(struct usb_serial_port *port, bool enable);
135
136enum 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
142struct pl2303_type_data {
143 speed_t max_baud_rate;
144 unsigned long quirks;
145};
146
147struct pl2303_serial_private {
148 const struct pl2303_type_data *type;
149 unsigned long quirks;
150};
151
152struct pl2303_private {
153 spinlock_t lock;
154 u8 line_control;
155 u8 line_status;
156
157 u8 line_settings[7];
158};
159
160static 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
170static 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
193static 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
212static 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
220static 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
272static 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
279static 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
296static 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
305static 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 */
325static 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 */
354static 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
362static 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
401static 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
432static 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
455static 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
478static 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
614static 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
631static 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
638static 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
673static 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
701static 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
727static 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
737static 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
762static 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
783static 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
790static 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
841static 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
871exit:
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
880static 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
930static 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
958static struct usb_serial_driver * const serial_drivers[] = {
959 &pl2303_device, NULL
960};
961
962module_usb_serial_driver(serial_drivers, id_table);
963
964MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
965MODULE_LICENSE("GPL");
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
37static 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
99MODULE_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
135static void pl2303_set_break(struct usb_serial_port *port, bool enable);
136
137enum 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
143struct pl2303_type_data {
144 speed_t max_baud_rate;
145 unsigned long quirks;
146};
147
148struct pl2303_serial_private {
149 const struct pl2303_type_data *type;
150 unsigned long quirks;
151};
152
153struct pl2303_private {
154 spinlock_t lock;
155 u8 line_control;
156 u8 line_status;
157
158 u8 line_settings[7];
159};
160
161static 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
171static 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
194static 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
213static 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
221static 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
281static 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
288static 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
305static 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
314static 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 */
334static 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 */
363static 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
371static 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
410static 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
441static 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
464static 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
487static 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
623static 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
640static 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
647static 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
682static 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
710static 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
736static 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
746static 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
771static 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
792static 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
799static 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
850static 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
880exit:
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
889static 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
939static 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
967static struct usb_serial_driver * const serial_drivers[] = {
968 &pl2303_device, NULL
969};
970
971module_usb_serial_driver(serial_drivers, id_table);
972
973MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
974MODULE_LICENSE("GPL");