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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// SPDX-License-Identifier: GPL-2.0
2/*
3 * Prolific PL2303 USB to serial adaptor driver
4 *
5 * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2003 IBM Corp.
7 *
8 * Original driver for 2.2.x by anonymous
9 *
10 * See Documentation/usb/usb-serial.rst for more information on using this
11 * driver
12 */
13
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/slab.h>
17#include <linux/tty.h>
18#include <linux/tty_driver.h>
19#include <linux/tty_flip.h>
20#include <linux/serial.h>
21#include <linux/module.h>
22#include <linux/moduleparam.h>
23#include <linux/spinlock.h>
24#include <linux/uaccess.h>
25#include <linux/usb.h>
26#include <linux/usb/serial.h>
27#include <asm/unaligned.h>
28#include "pl2303.h"
29
30
31#define PL2303_QUIRK_UART_STATE_IDX0 BIT(0)
32#define PL2303_QUIRK_LEGACY BIT(1)
33#define PL2303_QUIRK_ENDPOINT_HACK BIT(2)
34
35static const struct usb_device_id id_table[] = {
36 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID),
37 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
38 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
39 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
40 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
41 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_CHILITAG) },
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(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_TB) },
50 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
51 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
52 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID),
53 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
54 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC485),
55 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
56 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_UC232B),
57 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
58 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) },
59 { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
60 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
61 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
62 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
63 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
64 { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
65 { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
66 { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
67 { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
68 { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
69 { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
70 { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
71 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
72 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
73 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
74 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
75 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
76 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
77 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81),
78 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
79 { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
80 { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
81 { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
82 { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
83 { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
84 { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
85 { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
86 { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
87 { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
88 { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID),
89 .driver_info = PL2303_QUIRK_ENDPOINT_HACK },
90 { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
91 { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
92 { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
93 { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
94 { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
95 { USB_DEVICE(HP_VENDOR_ID, HP_LD220TA_PRODUCT_ID) },
96 { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
97 { USB_DEVICE(HP_VENDOR_ID, HP_LD960TA_PRODUCT_ID) },
98 { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
99 { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
100 { USB_DEVICE(HP_VENDOR_ID, HP_LM920_PRODUCT_ID) },
101 { USB_DEVICE(HP_VENDOR_ID, HP_LM940_PRODUCT_ID) },
102 { USB_DEVICE(HP_VENDOR_ID, HP_TD620_PRODUCT_ID) },
103 { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
104 { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
105 { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
106 { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
107 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
108 { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
109 { USB_DEVICE(AT_VENDOR_ID, AT_VTKIT3_PRODUCT_ID) },
110 { } /* Terminating entry */
111};
112
113MODULE_DEVICE_TABLE(usb, id_table);
114
115#define SET_LINE_REQUEST_TYPE 0x21
116#define SET_LINE_REQUEST 0x20
117
118#define SET_CONTROL_REQUEST_TYPE 0x21
119#define SET_CONTROL_REQUEST 0x22
120#define CONTROL_DTR 0x01
121#define CONTROL_RTS 0x02
122
123#define BREAK_REQUEST_TYPE 0x21
124#define BREAK_REQUEST 0x23
125#define BREAK_ON 0xffff
126#define BREAK_OFF 0x0000
127
128#define GET_LINE_REQUEST_TYPE 0xa1
129#define GET_LINE_REQUEST 0x21
130
131#define VENDOR_WRITE_REQUEST_TYPE 0x40
132#define VENDOR_WRITE_REQUEST 0x01
133
134#define VENDOR_READ_REQUEST_TYPE 0xc0
135#define VENDOR_READ_REQUEST 0x01
136
137#define UART_STATE_INDEX 8
138#define UART_STATE_MSR_MASK 0x8b
139#define UART_STATE_TRANSIENT_MASK 0x74
140#define UART_DCD 0x01
141#define UART_DSR 0x02
142#define UART_BREAK_ERROR 0x04
143#define UART_RING 0x08
144#define UART_FRAME_ERROR 0x10
145#define UART_PARITY_ERROR 0x20
146#define UART_OVERRUN_ERROR 0x40
147#define UART_CTS 0x80
148
149#define PL2303_FLOWCTRL_MASK 0xf0
150
151static void pl2303_set_break(struct usb_serial_port *port, bool enable);
152
153enum pl2303_type {
154 TYPE_01, /* Type 0 and 1 (difference unknown) */
155 TYPE_HX, /* HX version of the pl2303 chip */
156 TYPE_COUNT
157};
158
159struct pl2303_type_data {
160 speed_t max_baud_rate;
161 unsigned long quirks;
162 unsigned int no_autoxonxoff:1;
163};
164
165struct pl2303_serial_private {
166 const struct pl2303_type_data *type;
167 unsigned long quirks;
168};
169
170struct pl2303_private {
171 spinlock_t lock;
172 u8 line_control;
173 u8 line_status;
174
175 u8 line_settings[7];
176};
177
178static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
179 [TYPE_01] = {
180 .max_baud_rate = 1228800,
181 .quirks = PL2303_QUIRK_LEGACY,
182 .no_autoxonxoff = true,
183 },
184 [TYPE_HX] = {
185 .max_baud_rate = 12000000,
186 },
187};
188
189static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
190 unsigned char buf[1])
191{
192 struct device *dev = &serial->interface->dev;
193 int res;
194
195 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
196 VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
197 value, 0, buf, 1, 100);
198 if (res != 1) {
199 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
200 value, res);
201 if (res >= 0)
202 res = -EIO;
203
204 return res;
205 }
206
207 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
208
209 return 0;
210}
211
212static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
213{
214 struct device *dev = &serial->interface->dev;
215 int res;
216
217 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
218
219 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
220 VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
221 value, index, NULL, 0, 100);
222 if (res) {
223 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
224 value, res);
225 return res;
226 }
227
228 return 0;
229}
230
231static int pl2303_update_reg(struct usb_serial *serial, u8 reg, u8 mask, u8 val)
232{
233 int ret = 0;
234 u8 *buf;
235
236 buf = kmalloc(1, GFP_KERNEL);
237 if (!buf)
238 return -ENOMEM;
239
240 ret = pl2303_vendor_read(serial, reg | 0x80, buf);
241 if (ret)
242 goto out_free;
243
244 *buf &= ~mask;
245 *buf |= val & mask;
246
247 ret = pl2303_vendor_write(serial, reg, *buf);
248out_free:
249 kfree(buf);
250
251 return ret;
252}
253
254static int pl2303_probe(struct usb_serial *serial,
255 const struct usb_device_id *id)
256{
257 usb_set_serial_data(serial, (void *)id->driver_info);
258
259 return 0;
260}
261
262/*
263 * Use interrupt endpoint from first interface if available.
264 *
265 * This is needed due to the looney way its endpoints are set up.
266 */
267static int pl2303_endpoint_hack(struct usb_serial *serial,
268 struct usb_serial_endpoints *epds)
269{
270 struct usb_interface *interface = serial->interface;
271 struct usb_device *dev = serial->dev;
272 struct device *ddev = &interface->dev;
273 struct usb_host_interface *iface_desc;
274 struct usb_endpoint_descriptor *endpoint;
275 unsigned int i;
276
277 if (interface == dev->actconfig->interface[0])
278 return 0;
279
280 /* check out the endpoints of the other interface */
281 iface_desc = dev->actconfig->interface[0]->cur_altsetting;
282
283 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
284 endpoint = &iface_desc->endpoint[i].desc;
285
286 if (!usb_endpoint_is_int_in(endpoint))
287 continue;
288
289 dev_dbg(ddev, "found interrupt in on separate interface\n");
290 if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
291 epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
292 }
293
294 return 0;
295}
296
297static int pl2303_calc_num_ports(struct usb_serial *serial,
298 struct usb_serial_endpoints *epds)
299{
300 unsigned long quirks = (unsigned long)usb_get_serial_data(serial);
301 struct device *dev = &serial->interface->dev;
302 int ret;
303
304 if (quirks & PL2303_QUIRK_ENDPOINT_HACK) {
305 ret = pl2303_endpoint_hack(serial, epds);
306 if (ret)
307 return ret;
308 }
309
310 if (epds->num_interrupt_in < 1) {
311 dev_err(dev, "required interrupt-in endpoint missing\n");
312 return -ENODEV;
313 }
314
315 return 1;
316}
317
318static int pl2303_startup(struct usb_serial *serial)
319{
320 struct pl2303_serial_private *spriv;
321 enum pl2303_type type = TYPE_01;
322 unsigned char *buf;
323
324 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
325 if (!spriv)
326 return -ENOMEM;
327
328 buf = kmalloc(1, GFP_KERNEL);
329 if (!buf) {
330 kfree(spriv);
331 return -ENOMEM;
332 }
333
334 if (serial->dev->descriptor.bDeviceClass == 0x02)
335 type = TYPE_01; /* type 0 */
336 else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
337 type = TYPE_HX;
338 else if (serial->dev->descriptor.bDeviceClass == 0x00)
339 type = TYPE_01; /* type 1 */
340 else if (serial->dev->descriptor.bDeviceClass == 0xFF)
341 type = TYPE_01; /* type 1 */
342 dev_dbg(&serial->interface->dev, "device type: %d\n", type);
343
344 spriv->type = &pl2303_type_data[type];
345 spriv->quirks = (unsigned long)usb_get_serial_data(serial);
346 spriv->quirks |= spriv->type->quirks;
347
348 usb_set_serial_data(serial, spriv);
349
350 pl2303_vendor_read(serial, 0x8484, buf);
351 pl2303_vendor_write(serial, 0x0404, 0);
352 pl2303_vendor_read(serial, 0x8484, buf);
353 pl2303_vendor_read(serial, 0x8383, buf);
354 pl2303_vendor_read(serial, 0x8484, buf);
355 pl2303_vendor_write(serial, 0x0404, 1);
356 pl2303_vendor_read(serial, 0x8484, buf);
357 pl2303_vendor_read(serial, 0x8383, buf);
358 pl2303_vendor_write(serial, 0, 1);
359 pl2303_vendor_write(serial, 1, 0);
360 if (spriv->quirks & PL2303_QUIRK_LEGACY)
361 pl2303_vendor_write(serial, 2, 0x24);
362 else
363 pl2303_vendor_write(serial, 2, 0x44);
364
365 kfree(buf);
366
367 return 0;
368}
369
370static void pl2303_release(struct usb_serial *serial)
371{
372 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
373
374 kfree(spriv);
375}
376
377static int pl2303_port_probe(struct usb_serial_port *port)
378{
379 struct pl2303_private *priv;
380
381 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
382 if (!priv)
383 return -ENOMEM;
384
385 spin_lock_init(&priv->lock);
386
387 usb_set_serial_port_data(port, priv);
388
389 port->port.drain_delay = 256;
390
391 return 0;
392}
393
394static int pl2303_port_remove(struct usb_serial_port *port)
395{
396 struct pl2303_private *priv = usb_get_serial_port_data(port);
397
398 kfree(priv);
399
400 return 0;
401}
402
403static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
404{
405 struct usb_device *dev = port->serial->dev;
406 int retval;
407
408 dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
409
410 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
411 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
412 value, 0, NULL, 0, 100);
413 if (retval)
414 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
415
416 return retval;
417}
418
419/*
420 * Returns the nearest supported baud rate that can be set directly without
421 * using divisors.
422 */
423static speed_t pl2303_get_supported_baud_rate(speed_t baud)
424{
425 static const speed_t baud_sup[] = {
426 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
427 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
428 614400, 921600, 1228800, 2457600, 3000000, 6000000
429 };
430
431 unsigned i;
432
433 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
434 if (baud_sup[i] > baud)
435 break;
436 }
437
438 if (i == ARRAY_SIZE(baud_sup))
439 baud = baud_sup[i - 1];
440 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
441 baud = baud_sup[i - 1];
442 else
443 baud = baud_sup[i];
444
445 return baud;
446}
447
448/*
449 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
450 * use 9600 baud.
451 */
452static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
453 speed_t baud)
454{
455 put_unaligned_le32(baud, buf);
456
457 return baud;
458}
459
460static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
461 speed_t baud)
462{
463 unsigned int baseline, mantissa, exponent;
464
465 /*
466 * Apparently the formula is:
467 * baudrate = 12M * 32 / (mantissa * 4^exponent)
468 * where
469 * mantissa = buf[8:0]
470 * exponent = buf[11:9]
471 */
472 baseline = 12000000 * 32;
473 mantissa = baseline / baud;
474 if (mantissa == 0)
475 mantissa = 1; /* Avoid dividing by zero if baud > 32*12M. */
476 exponent = 0;
477 while (mantissa >= 512) {
478 if (exponent < 7) {
479 mantissa >>= 2; /* divide by 4 */
480 exponent++;
481 } else {
482 /* Exponent is maxed. Trim mantissa and leave. */
483 mantissa = 511;
484 break;
485 }
486 }
487
488 buf[3] = 0x80;
489 buf[2] = 0;
490 buf[1] = exponent << 1 | mantissa >> 8;
491 buf[0] = mantissa & 0xff;
492
493 /* Calculate and return the exact baud rate. */
494 baud = (baseline / mantissa) >> (exponent << 1);
495
496 return baud;
497}
498
499static void pl2303_encode_baud_rate(struct tty_struct *tty,
500 struct usb_serial_port *port,
501 u8 buf[4])
502{
503 struct usb_serial *serial = port->serial;
504 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
505 speed_t baud_sup;
506 speed_t baud;
507
508 baud = tty_get_baud_rate(tty);
509 dev_dbg(&port->dev, "baud requested = %u\n", baud);
510 if (!baud)
511 return;
512
513 if (spriv->type->max_baud_rate)
514 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
515 /*
516 * Use direct method for supported baud rates, otherwise use divisors.
517 */
518 baud_sup = pl2303_get_supported_baud_rate(baud);
519
520 if (baud == baud_sup)
521 baud = pl2303_encode_baud_rate_direct(buf, baud);
522 else
523 baud = pl2303_encode_baud_rate_divisor(buf, baud);
524
525 /* Save resulting baud rate */
526 tty_encode_baud_rate(tty, baud, baud);
527 dev_dbg(&port->dev, "baud set = %u\n", baud);
528}
529
530static int pl2303_get_line_request(struct usb_serial_port *port,
531 unsigned char buf[7])
532{
533 struct usb_device *udev = port->serial->dev;
534 int ret;
535
536 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
537 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
538 0, 0, buf, 7, 100);
539 if (ret != 7) {
540 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
541
542 if (ret >= 0)
543 ret = -EIO;
544
545 return ret;
546 }
547
548 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
549
550 return 0;
551}
552
553static int pl2303_set_line_request(struct usb_serial_port *port,
554 unsigned char buf[7])
555{
556 struct usb_device *udev = port->serial->dev;
557 int ret;
558
559 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
560 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
561 0, 0, buf, 7, 100);
562 if (ret < 0) {
563 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
564 return ret;
565 }
566
567 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
568
569 return 0;
570}
571
572static bool pl2303_termios_change(const struct ktermios *a, const struct ktermios *b)
573{
574 bool ixon_change;
575
576 ixon_change = ((a->c_iflag ^ b->c_iflag) & (IXON | IXANY)) ||
577 a->c_cc[VSTART] != b->c_cc[VSTART] ||
578 a->c_cc[VSTOP] != b->c_cc[VSTOP];
579
580 return tty_termios_hw_change(a, b) || ixon_change;
581}
582
583static bool pl2303_enable_xonxoff(struct tty_struct *tty, const struct pl2303_type_data *type)
584{
585 if (!I_IXON(tty) || I_IXANY(tty))
586 return false;
587
588 if (START_CHAR(tty) != 0x11 || STOP_CHAR(tty) != 0x13)
589 return false;
590
591 if (type->no_autoxonxoff)
592 return false;
593
594 return true;
595}
596
597static void pl2303_set_termios(struct tty_struct *tty,
598 struct usb_serial_port *port, struct ktermios *old_termios)
599{
600 struct usb_serial *serial = port->serial;
601 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
602 struct pl2303_private *priv = usb_get_serial_port_data(port);
603 unsigned long flags;
604 unsigned char *buf;
605 int ret;
606 u8 control;
607
608 if (old_termios && !pl2303_termios_change(&tty->termios, old_termios))
609 return;
610
611 buf = kzalloc(7, GFP_KERNEL);
612 if (!buf) {
613 /* Report back no change occurred */
614 if (old_termios)
615 tty->termios = *old_termios;
616 return;
617 }
618
619 pl2303_get_line_request(port, buf);
620
621 switch (C_CSIZE(tty)) {
622 case CS5:
623 buf[6] = 5;
624 break;
625 case CS6:
626 buf[6] = 6;
627 break;
628 case CS7:
629 buf[6] = 7;
630 break;
631 default:
632 case CS8:
633 buf[6] = 8;
634 }
635 dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
636
637 /* For reference buf[0]:buf[3] baud rate value */
638 pl2303_encode_baud_rate(tty, port, &buf[0]);
639
640 /* For reference buf[4]=0 is 1 stop bits */
641 /* For reference buf[4]=1 is 1.5 stop bits */
642 /* For reference buf[4]=2 is 2 stop bits */
643 if (C_CSTOPB(tty)) {
644 /*
645 * NOTE: Comply with "real" UARTs / RS232:
646 * use 1.5 instead of 2 stop bits with 5 data bits
647 */
648 if (C_CSIZE(tty) == CS5) {
649 buf[4] = 1;
650 dev_dbg(&port->dev, "stop bits = 1.5\n");
651 } else {
652 buf[4] = 2;
653 dev_dbg(&port->dev, "stop bits = 2\n");
654 }
655 } else {
656 buf[4] = 0;
657 dev_dbg(&port->dev, "stop bits = 1\n");
658 }
659
660 if (C_PARENB(tty)) {
661 /* For reference buf[5]=0 is none parity */
662 /* For reference buf[5]=1 is odd parity */
663 /* For reference buf[5]=2 is even parity */
664 /* For reference buf[5]=3 is mark parity */
665 /* For reference buf[5]=4 is space parity */
666 if (C_PARODD(tty)) {
667 if (C_CMSPAR(tty)) {
668 buf[5] = 3;
669 dev_dbg(&port->dev, "parity = mark\n");
670 } else {
671 buf[5] = 1;
672 dev_dbg(&port->dev, "parity = odd\n");
673 }
674 } else {
675 if (C_CMSPAR(tty)) {
676 buf[5] = 4;
677 dev_dbg(&port->dev, "parity = space\n");
678 } else {
679 buf[5] = 2;
680 dev_dbg(&port->dev, "parity = even\n");
681 }
682 }
683 } else {
684 buf[5] = 0;
685 dev_dbg(&port->dev, "parity = none\n");
686 }
687
688 /*
689 * Some PL2303 are known to lose bytes if you change serial settings
690 * even to the same values as before. Thus we actually need to filter
691 * in this specific case.
692 *
693 * Note that the tty_termios_hw_change check above is not sufficient
694 * as a previously requested baud rate may differ from the one
695 * actually used (and stored in old_termios).
696 *
697 * NOTE: No additional locking needed for line_settings as it is
698 * only used in set_termios, which is serialised against itself.
699 */
700 if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
701 ret = pl2303_set_line_request(port, buf);
702 if (!ret)
703 memcpy(priv->line_settings, buf, 7);
704 }
705
706 /* change control lines if we are switching to or from B0 */
707 spin_lock_irqsave(&priv->lock, flags);
708 control = priv->line_control;
709 if (C_BAUD(tty) == B0)
710 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
711 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
712 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
713 if (control != priv->line_control) {
714 control = priv->line_control;
715 spin_unlock_irqrestore(&priv->lock, flags);
716 pl2303_set_control_lines(port, control);
717 } else {
718 spin_unlock_irqrestore(&priv->lock, flags);
719 }
720
721 if (C_CRTSCTS(tty)) {
722 if (spriv->quirks & PL2303_QUIRK_LEGACY)
723 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x40);
724 else
725 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0x60);
726 } else if (pl2303_enable_xonxoff(tty, spriv->type)) {
727 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0xc0);
728 } else {
729 pl2303_update_reg(serial, 0, PL2303_FLOWCTRL_MASK, 0);
730 }
731
732 kfree(buf);
733}
734
735static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
736{
737 struct pl2303_private *priv = usb_get_serial_port_data(port);
738 unsigned long flags;
739 u8 control;
740
741 spin_lock_irqsave(&priv->lock, flags);
742 if (on)
743 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
744 else
745 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
746 control = priv->line_control;
747 spin_unlock_irqrestore(&priv->lock, flags);
748
749 pl2303_set_control_lines(port, control);
750}
751
752static void pl2303_close(struct usb_serial_port *port)
753{
754 usb_serial_generic_close(port);
755 usb_kill_urb(port->interrupt_in_urb);
756 pl2303_set_break(port, false);
757}
758
759static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
760{
761 struct usb_serial *serial = port->serial;
762 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
763 int result;
764
765 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
766 usb_clear_halt(serial->dev, port->write_urb->pipe);
767 usb_clear_halt(serial->dev, port->read_urb->pipe);
768 } else {
769 /* reset upstream data pipes */
770 pl2303_vendor_write(serial, 8, 0);
771 pl2303_vendor_write(serial, 9, 0);
772 }
773
774 /* Setup termios */
775 if (tty)
776 pl2303_set_termios(tty, port, NULL);
777
778 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
779 if (result) {
780 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
781 result);
782 return result;
783 }
784
785 result = usb_serial_generic_open(tty, port);
786 if (result) {
787 usb_kill_urb(port->interrupt_in_urb);
788 return result;
789 }
790
791 return 0;
792}
793
794static int pl2303_tiocmset(struct tty_struct *tty,
795 unsigned int set, unsigned int clear)
796{
797 struct usb_serial_port *port = tty->driver_data;
798 struct pl2303_private *priv = usb_get_serial_port_data(port);
799 unsigned long flags;
800 u8 control;
801 int ret;
802
803 spin_lock_irqsave(&priv->lock, flags);
804 if (set & TIOCM_RTS)
805 priv->line_control |= CONTROL_RTS;
806 if (set & TIOCM_DTR)
807 priv->line_control |= CONTROL_DTR;
808 if (clear & TIOCM_RTS)
809 priv->line_control &= ~CONTROL_RTS;
810 if (clear & TIOCM_DTR)
811 priv->line_control &= ~CONTROL_DTR;
812 control = priv->line_control;
813 spin_unlock_irqrestore(&priv->lock, flags);
814
815 ret = pl2303_set_control_lines(port, control);
816 if (ret)
817 return usb_translate_errors(ret);
818
819 return 0;
820}
821
822static int pl2303_tiocmget(struct tty_struct *tty)
823{
824 struct usb_serial_port *port = tty->driver_data;
825 struct pl2303_private *priv = usb_get_serial_port_data(port);
826 unsigned long flags;
827 unsigned int mcr;
828 unsigned int status;
829 unsigned int result;
830
831 spin_lock_irqsave(&priv->lock, flags);
832 mcr = priv->line_control;
833 status = priv->line_status;
834 spin_unlock_irqrestore(&priv->lock, flags);
835
836 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
837 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
838 | ((status & UART_CTS) ? TIOCM_CTS : 0)
839 | ((status & UART_DSR) ? TIOCM_DSR : 0)
840 | ((status & UART_RING) ? TIOCM_RI : 0)
841 | ((status & UART_DCD) ? TIOCM_CD : 0);
842
843 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
844
845 return result;
846}
847
848static int pl2303_carrier_raised(struct usb_serial_port *port)
849{
850 struct pl2303_private *priv = usb_get_serial_port_data(port);
851
852 if (priv->line_status & UART_DCD)
853 return 1;
854
855 return 0;
856}
857
858static int pl2303_get_serial(struct tty_struct *tty,
859 struct serial_struct *ss)
860{
861 struct usb_serial_port *port = tty->driver_data;
862
863 ss->type = PORT_16654;
864 ss->line = port->minor;
865 ss->port = port->port_number;
866 ss->baud_base = 460800;
867 return 0;
868}
869
870static void pl2303_set_break(struct usb_serial_port *port, bool enable)
871{
872 struct usb_serial *serial = port->serial;
873 u16 state;
874 int result;
875
876 if (enable)
877 state = BREAK_ON;
878 else
879 state = BREAK_OFF;
880
881 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
882 state == BREAK_OFF ? "off" : "on");
883
884 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
885 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
886 0, NULL, 0, 100);
887 if (result)
888 dev_err(&port->dev, "error sending break = %d\n", result);
889}
890
891static void pl2303_break_ctl(struct tty_struct *tty, int state)
892{
893 struct usb_serial_port *port = tty->driver_data;
894
895 pl2303_set_break(port, state);
896}
897
898static void pl2303_update_line_status(struct usb_serial_port *port,
899 unsigned char *data,
900 unsigned int actual_length)
901{
902 struct usb_serial *serial = port->serial;
903 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
904 struct pl2303_private *priv = usb_get_serial_port_data(port);
905 struct tty_struct *tty;
906 unsigned long flags;
907 unsigned int status_idx = UART_STATE_INDEX;
908 u8 status;
909 u8 delta;
910
911 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
912 status_idx = 0;
913
914 if (actual_length < status_idx + 1)
915 return;
916
917 status = data[status_idx];
918
919 /* Save off the uart status for others to look at */
920 spin_lock_irqsave(&priv->lock, flags);
921 delta = priv->line_status ^ status;
922 priv->line_status = status;
923 spin_unlock_irqrestore(&priv->lock, flags);
924
925 if (status & UART_BREAK_ERROR)
926 usb_serial_handle_break(port);
927
928 if (delta & UART_STATE_MSR_MASK) {
929 if (delta & UART_CTS)
930 port->icount.cts++;
931 if (delta & UART_DSR)
932 port->icount.dsr++;
933 if (delta & UART_RING)
934 port->icount.rng++;
935 if (delta & UART_DCD) {
936 port->icount.dcd++;
937 tty = tty_port_tty_get(&port->port);
938 if (tty) {
939 usb_serial_handle_dcd_change(port, tty,
940 status & UART_DCD);
941 tty_kref_put(tty);
942 }
943 }
944
945 wake_up_interruptible(&port->port.delta_msr_wait);
946 }
947}
948
949static void pl2303_read_int_callback(struct urb *urb)
950{
951 struct usb_serial_port *port = urb->context;
952 unsigned char *data = urb->transfer_buffer;
953 unsigned int actual_length = urb->actual_length;
954 int status = urb->status;
955 int retval;
956
957 switch (status) {
958 case 0:
959 /* success */
960 break;
961 case -ECONNRESET:
962 case -ENOENT:
963 case -ESHUTDOWN:
964 /* this urb is terminated, clean up */
965 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
966 __func__, status);
967 return;
968 default:
969 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
970 __func__, status);
971 goto exit;
972 }
973
974 usb_serial_debug_data(&port->dev, __func__,
975 urb->actual_length, urb->transfer_buffer);
976
977 pl2303_update_line_status(port, data, actual_length);
978
979exit:
980 retval = usb_submit_urb(urb, GFP_ATOMIC);
981 if (retval) {
982 dev_err(&port->dev,
983 "%s - usb_submit_urb failed with result %d\n",
984 __func__, retval);
985 }
986}
987
988static void pl2303_process_read_urb(struct urb *urb)
989{
990 struct usb_serial_port *port = urb->context;
991 struct pl2303_private *priv = usb_get_serial_port_data(port);
992 unsigned char *data = urb->transfer_buffer;
993 char tty_flag = TTY_NORMAL;
994 unsigned long flags;
995 u8 line_status;
996 int i;
997
998 /* update line status */
999 spin_lock_irqsave(&priv->lock, flags);
1000 line_status = priv->line_status;
1001 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
1002 spin_unlock_irqrestore(&priv->lock, flags);
1003
1004 if (!urb->actual_length)
1005 return;
1006
1007 /*
1008 * Break takes precedence over parity, which takes precedence over
1009 * framing errors.
1010 */
1011 if (line_status & UART_BREAK_ERROR)
1012 tty_flag = TTY_BREAK;
1013 else if (line_status & UART_PARITY_ERROR)
1014 tty_flag = TTY_PARITY;
1015 else if (line_status & UART_FRAME_ERROR)
1016 tty_flag = TTY_FRAME;
1017
1018 if (tty_flag != TTY_NORMAL)
1019 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
1020 tty_flag);
1021 /* overrun is special, not associated with a char */
1022 if (line_status & UART_OVERRUN_ERROR)
1023 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
1024
1025 if (port->port.console && port->sysrq) {
1026 for (i = 0; i < urb->actual_length; ++i)
1027 if (!usb_serial_handle_sysrq_char(port, data[i]))
1028 tty_insert_flip_char(&port->port, data[i],
1029 tty_flag);
1030 } else {
1031 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
1032 urb->actual_length);
1033 }
1034
1035 tty_flip_buffer_push(&port->port);
1036}
1037
1038static struct usb_serial_driver pl2303_device = {
1039 .driver = {
1040 .owner = THIS_MODULE,
1041 .name = "pl2303",
1042 },
1043 .id_table = id_table,
1044 .num_bulk_in = 1,
1045 .num_bulk_out = 1,
1046 .num_interrupt_in = 0, /* see pl2303_calc_num_ports */
1047 .bulk_in_size = 256,
1048 .bulk_out_size = 256,
1049 .open = pl2303_open,
1050 .close = pl2303_close,
1051 .dtr_rts = pl2303_dtr_rts,
1052 .carrier_raised = pl2303_carrier_raised,
1053 .get_serial = pl2303_get_serial,
1054 .break_ctl = pl2303_break_ctl,
1055 .set_termios = pl2303_set_termios,
1056 .tiocmget = pl2303_tiocmget,
1057 .tiocmset = pl2303_tiocmset,
1058 .tiocmiwait = usb_serial_generic_tiocmiwait,
1059 .process_read_urb = pl2303_process_read_urb,
1060 .read_int_callback = pl2303_read_int_callback,
1061 .probe = pl2303_probe,
1062 .calc_num_ports = pl2303_calc_num_ports,
1063 .attach = pl2303_startup,
1064 .release = pl2303_release,
1065 .port_probe = pl2303_port_probe,
1066 .port_remove = pl2303_port_remove,
1067};
1068
1069static struct usb_serial_driver * const serial_drivers[] = {
1070 &pl2303_device, NULL
1071};
1072
1073module_usb_serial_driver(serial_drivers, id_table);
1074
1075MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
1076MODULE_LICENSE("GPL v2");