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Merge tag 'dm-3.19-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device...
[deliverable/linux.git] / drivers / usb / serial / pl2303.c
1 /*
2 * Prolific PL2303 USB to serial adaptor driver
3 *
4 * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
5 * Copyright (C) 2003 IBM Corp.
6 *
7 * Original driver for 2.2.x by anonymous
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License version
11 * 2 as published by the Free Software Foundation.
12 *
13 * See Documentation/usb/usb-serial.txt for more information on using this
14 * driver
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/errno.h>
19 #include <linux/slab.h>
20 #include <linux/tty.h>
21 #include <linux/tty_driver.h>
22 #include <linux/tty_flip.h>
23 #include <linux/serial.h>
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <linux/spinlock.h>
27 #include <linux/uaccess.h>
28 #include <linux/usb.h>
29 #include <linux/usb/serial.h>
30 #include <asm/unaligned.h>
31 #include "pl2303.h"
32
33
34 #define PL2303_QUIRK_UART_STATE_IDX0 BIT(0)
35 #define PL2303_QUIRK_LEGACY BIT(1)
36
37 static const struct usb_device_id id_table[] = {
38 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
39 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
40 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
41 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
42 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
43 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
44 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
45 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
46 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
47 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
48 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
49 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
50 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
51 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
52 { USB_DEVICE(ATEN_VENDOR_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(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
65 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
66 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
67 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
68 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
69 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
70 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
71 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) },
72 { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
73 { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
74 { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
75 { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
76 { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
77 { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
78 { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
79 { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
80 { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
81 { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
82 { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
83 { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
84 { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
85 { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
86 { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
87 { USB_DEVICE(HP_VENDOR_ID, HP_LD960_PRODUCT_ID) },
88 { USB_DEVICE(HP_VENDOR_ID, HP_LCM220_PRODUCT_ID) },
89 { USB_DEVICE(HP_VENDOR_ID, HP_LCM960_PRODUCT_ID) },
90 { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
91 { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
92 { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
93 { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
94 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
95 { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
96 { } /* Terminating entry */
97 };
98
99 MODULE_DEVICE_TABLE(usb, id_table);
100
101 #define SET_LINE_REQUEST_TYPE 0x21
102 #define SET_LINE_REQUEST 0x20
103
104 #define SET_CONTROL_REQUEST_TYPE 0x21
105 #define SET_CONTROL_REQUEST 0x22
106 #define CONTROL_DTR 0x01
107 #define CONTROL_RTS 0x02
108
109 #define BREAK_REQUEST_TYPE 0x21
110 #define BREAK_REQUEST 0x23
111 #define BREAK_ON 0xffff
112 #define BREAK_OFF 0x0000
113
114 #define GET_LINE_REQUEST_TYPE 0xa1
115 #define GET_LINE_REQUEST 0x21
116
117 #define VENDOR_WRITE_REQUEST_TYPE 0x40
118 #define VENDOR_WRITE_REQUEST 0x01
119
120 #define VENDOR_READ_REQUEST_TYPE 0xc0
121 #define VENDOR_READ_REQUEST 0x01
122
123 #define UART_STATE_INDEX 8
124 #define UART_STATE_MSR_MASK 0x8b
125 #define UART_STATE_TRANSIENT_MASK 0x74
126 #define UART_DCD 0x01
127 #define UART_DSR 0x02
128 #define UART_BREAK_ERROR 0x04
129 #define UART_RING 0x08
130 #define UART_FRAME_ERROR 0x10
131 #define UART_PARITY_ERROR 0x20
132 #define UART_OVERRUN_ERROR 0x40
133 #define UART_CTS 0x80
134
135
136 enum 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
142 struct pl2303_type_data {
143 speed_t max_baud_rate;
144 unsigned long quirks;
145 };
146
147 struct pl2303_serial_private {
148 const struct pl2303_type_data *type;
149 unsigned long quirks;
150 };
151
152 struct pl2303_private {
153 spinlock_t lock;
154 u8 line_control;
155 u8 line_status;
156
157 u8 line_settings[7];
158 };
159
160 static 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
170 static 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
193 static 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
212 static 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
220 static 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
272 static 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
279 static 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
296 static 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
305 static 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 */
325 static 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 */
354 static 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
362 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
363 speed_t baud)
364 {
365 unsigned int tmp;
366
367 /*
368 * Apparently the formula is:
369 * baudrate = 12M * 32 / (2^buf[1]) / buf[0]
370 */
371 tmp = 12000000 * 32 / baud;
372 buf[3] = 0x80;
373 buf[2] = 0;
374 buf[1] = (tmp >= 256);
375 while (tmp >= 256) {
376 tmp >>= 2;
377 buf[1] <<= 1;
378 }
379 buf[0] = tmp;
380
381 return baud;
382 }
383
384 static void pl2303_encode_baud_rate(struct tty_struct *tty,
385 struct usb_serial_port *port,
386 u8 buf[4])
387 {
388 struct usb_serial *serial = port->serial;
389 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
390 speed_t baud_sup;
391 speed_t baud;
392
393 baud = tty_get_baud_rate(tty);
394 dev_dbg(&port->dev, "baud requested = %u\n", baud);
395 if (!baud)
396 return;
397
398 if (spriv->type->max_baud_rate)
399 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
400 /*
401 * Use direct method for supported baud rates, otherwise use divisors.
402 */
403 baud_sup = pl2303_get_supported_baud_rate(baud);
404
405 if (baud == baud_sup)
406 baud = pl2303_encode_baud_rate_direct(buf, baud);
407 else
408 baud = pl2303_encode_baud_rate_divisor(buf, baud);
409
410 /* Save resulting baud rate */
411 tty_encode_baud_rate(tty, baud, baud);
412 dev_dbg(&port->dev, "baud set = %u\n", baud);
413 }
414
415 static int pl2303_get_line_request(struct usb_serial_port *port,
416 unsigned char buf[7])
417 {
418 struct usb_device *udev = port->serial->dev;
419 int ret;
420
421 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
422 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
423 0, 0, buf, 7, 100);
424 if (ret != 7) {
425 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
426
427 if (ret > 0)
428 ret = -EIO;
429
430 return ret;
431 }
432
433 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
434
435 return 0;
436 }
437
438 static int pl2303_set_line_request(struct usb_serial_port *port,
439 unsigned char buf[7])
440 {
441 struct usb_device *udev = port->serial->dev;
442 int ret;
443
444 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
445 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
446 0, 0, buf, 7, 100);
447 if (ret != 7) {
448 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
449
450 if (ret > 0)
451 ret = -EIO;
452
453 return ret;
454 }
455
456 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
457
458 return 0;
459 }
460
461 static void pl2303_set_termios(struct tty_struct *tty,
462 struct usb_serial_port *port, struct ktermios *old_termios)
463 {
464 struct usb_serial *serial = port->serial;
465 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
466 struct pl2303_private *priv = usb_get_serial_port_data(port);
467 unsigned long flags;
468 unsigned char *buf;
469 int ret;
470 u8 control;
471
472 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
473 return;
474
475 buf = kzalloc(7, GFP_KERNEL);
476 if (!buf) {
477 /* Report back no change occurred */
478 if (old_termios)
479 tty->termios = *old_termios;
480 return;
481 }
482
483 pl2303_get_line_request(port, buf);
484
485 switch (C_CSIZE(tty)) {
486 case CS5:
487 buf[6] = 5;
488 break;
489 case CS6:
490 buf[6] = 6;
491 break;
492 case CS7:
493 buf[6] = 7;
494 break;
495 default:
496 case CS8:
497 buf[6] = 8;
498 }
499 dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
500
501 /* For reference buf[0]:buf[3] baud rate value */
502 pl2303_encode_baud_rate(tty, port, &buf[0]);
503
504 /* For reference buf[4]=0 is 1 stop bits */
505 /* For reference buf[4]=1 is 1.5 stop bits */
506 /* For reference buf[4]=2 is 2 stop bits */
507 if (C_CSTOPB(tty)) {
508 /*
509 * NOTE: Comply with "real" UARTs / RS232:
510 * use 1.5 instead of 2 stop bits with 5 data bits
511 */
512 if (C_CSIZE(tty) == CS5) {
513 buf[4] = 1;
514 dev_dbg(&port->dev, "stop bits = 1.5\n");
515 } else {
516 buf[4] = 2;
517 dev_dbg(&port->dev, "stop bits = 2\n");
518 }
519 } else {
520 buf[4] = 0;
521 dev_dbg(&port->dev, "stop bits = 1\n");
522 }
523
524 if (C_PARENB(tty)) {
525 /* For reference buf[5]=0 is none parity */
526 /* For reference buf[5]=1 is odd parity */
527 /* For reference buf[5]=2 is even parity */
528 /* For reference buf[5]=3 is mark parity */
529 /* For reference buf[5]=4 is space parity */
530 if (C_PARODD(tty)) {
531 if (C_CMSPAR(tty)) {
532 buf[5] = 3;
533 dev_dbg(&port->dev, "parity = mark\n");
534 } else {
535 buf[5] = 1;
536 dev_dbg(&port->dev, "parity = odd\n");
537 }
538 } else {
539 if (C_CMSPAR(tty)) {
540 buf[5] = 4;
541 dev_dbg(&port->dev, "parity = space\n");
542 } else {
543 buf[5] = 2;
544 dev_dbg(&port->dev, "parity = even\n");
545 }
546 }
547 } else {
548 buf[5] = 0;
549 dev_dbg(&port->dev, "parity = none\n");
550 }
551
552 /*
553 * Some PL2303 are known to lose bytes if you change serial settings
554 * even to the same values as before. Thus we actually need to filter
555 * in this specific case.
556 *
557 * Note that the tty_termios_hw_change check above is not sufficient
558 * as a previously requested baud rate may differ from the one
559 * actually used (and stored in old_termios).
560 *
561 * NOTE: No additional locking needed for line_settings as it is
562 * only used in set_termios, which is serialised against itself.
563 */
564 if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
565 ret = pl2303_set_line_request(port, buf);
566 if (!ret)
567 memcpy(priv->line_settings, buf, 7);
568 }
569
570 /* change control lines if we are switching to or from B0 */
571 spin_lock_irqsave(&priv->lock, flags);
572 control = priv->line_control;
573 if (C_BAUD(tty) == B0)
574 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
575 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
576 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
577 if (control != priv->line_control) {
578 control = priv->line_control;
579 spin_unlock_irqrestore(&priv->lock, flags);
580 pl2303_set_control_lines(port, control);
581 } else {
582 spin_unlock_irqrestore(&priv->lock, flags);
583 }
584
585 if (C_CRTSCTS(tty)) {
586 if (spriv->quirks & PL2303_QUIRK_LEGACY)
587 pl2303_vendor_write(serial, 0x0, 0x41);
588 else
589 pl2303_vendor_write(serial, 0x0, 0x61);
590 } else {
591 pl2303_vendor_write(serial, 0x0, 0x0);
592 }
593
594 kfree(buf);
595 }
596
597 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
598 {
599 struct pl2303_private *priv = usb_get_serial_port_data(port);
600 unsigned long flags;
601 u8 control;
602
603 spin_lock_irqsave(&priv->lock, flags);
604 if (on)
605 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
606 else
607 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
608 control = priv->line_control;
609 spin_unlock_irqrestore(&priv->lock, flags);
610
611 pl2303_set_control_lines(port, control);
612 }
613
614 static void pl2303_close(struct usb_serial_port *port)
615 {
616 usb_serial_generic_close(port);
617 usb_kill_urb(port->interrupt_in_urb);
618 }
619
620 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
621 {
622 struct usb_serial *serial = port->serial;
623 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
624 int result;
625
626 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
627 usb_clear_halt(serial->dev, port->write_urb->pipe);
628 usb_clear_halt(serial->dev, port->read_urb->pipe);
629 } else {
630 /* reset upstream data pipes */
631 pl2303_vendor_write(serial, 8, 0);
632 pl2303_vendor_write(serial, 9, 0);
633 }
634
635 /* Setup termios */
636 if (tty)
637 pl2303_set_termios(tty, port, NULL);
638
639 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
640 if (result) {
641 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
642 result);
643 return result;
644 }
645
646 result = usb_serial_generic_open(tty, port);
647 if (result) {
648 usb_kill_urb(port->interrupt_in_urb);
649 return result;
650 }
651
652 return 0;
653 }
654
655 static int pl2303_tiocmset(struct tty_struct *tty,
656 unsigned int set, unsigned int clear)
657 {
658 struct usb_serial_port *port = tty->driver_data;
659 struct pl2303_private *priv = usb_get_serial_port_data(port);
660 unsigned long flags;
661 u8 control;
662 int ret;
663
664 spin_lock_irqsave(&priv->lock, flags);
665 if (set & TIOCM_RTS)
666 priv->line_control |= CONTROL_RTS;
667 if (set & TIOCM_DTR)
668 priv->line_control |= CONTROL_DTR;
669 if (clear & TIOCM_RTS)
670 priv->line_control &= ~CONTROL_RTS;
671 if (clear & TIOCM_DTR)
672 priv->line_control &= ~CONTROL_DTR;
673 control = priv->line_control;
674 spin_unlock_irqrestore(&priv->lock, flags);
675
676 ret = pl2303_set_control_lines(port, control);
677 if (ret)
678 return usb_translate_errors(ret);
679
680 return 0;
681 }
682
683 static int pl2303_tiocmget(struct tty_struct *tty)
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 unsigned int mcr;
689 unsigned int status;
690 unsigned int result;
691
692 spin_lock_irqsave(&priv->lock, flags);
693 mcr = priv->line_control;
694 status = priv->line_status;
695 spin_unlock_irqrestore(&priv->lock, flags);
696
697 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
698 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
699 | ((status & UART_CTS) ? TIOCM_CTS : 0)
700 | ((status & UART_DSR) ? TIOCM_DSR : 0)
701 | ((status & UART_RING) ? TIOCM_RI : 0)
702 | ((status & UART_DCD) ? TIOCM_CD : 0);
703
704 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
705
706 return result;
707 }
708
709 static int pl2303_carrier_raised(struct usb_serial_port *port)
710 {
711 struct pl2303_private *priv = usb_get_serial_port_data(port);
712
713 if (priv->line_status & UART_DCD)
714 return 1;
715
716 return 0;
717 }
718
719 static int pl2303_ioctl(struct tty_struct *tty,
720 unsigned int cmd, unsigned long arg)
721 {
722 struct serial_struct ser;
723 struct usb_serial_port *port = tty->driver_data;
724
725 switch (cmd) {
726 case TIOCGSERIAL:
727 memset(&ser, 0, sizeof ser);
728 ser.type = PORT_16654;
729 ser.line = port->minor;
730 ser.port = port->port_number;
731 ser.baud_base = 460800;
732
733 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
734 return -EFAULT;
735
736 return 0;
737 default:
738 break;
739 }
740
741 return -ENOIOCTLCMD;
742 }
743
744 static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
745 {
746 struct usb_serial_port *port = tty->driver_data;
747 struct usb_serial *serial = port->serial;
748 u16 state;
749 int result;
750
751 if (break_state == 0)
752 state = BREAK_OFF;
753 else
754 state = BREAK_ON;
755
756 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
757 state == BREAK_OFF ? "off" : "on");
758
759 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
760 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
761 0, NULL, 0, 100);
762 if (result)
763 dev_err(&port->dev, "error sending break = %d\n", result);
764 }
765
766 static void pl2303_update_line_status(struct usb_serial_port *port,
767 unsigned char *data,
768 unsigned int actual_length)
769 {
770 struct usb_serial *serial = port->serial;
771 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
772 struct pl2303_private *priv = usb_get_serial_port_data(port);
773 struct tty_struct *tty;
774 unsigned long flags;
775 unsigned int status_idx = UART_STATE_INDEX;
776 u8 status;
777 u8 delta;
778
779 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
780 status_idx = 0;
781
782 if (actual_length < status_idx + 1)
783 return;
784
785 status = data[status_idx];
786
787 /* Save off the uart status for others to look at */
788 spin_lock_irqsave(&priv->lock, flags);
789 delta = priv->line_status ^ status;
790 priv->line_status = status;
791 spin_unlock_irqrestore(&priv->lock, flags);
792
793 if (status & UART_BREAK_ERROR)
794 usb_serial_handle_break(port);
795
796 if (delta & UART_STATE_MSR_MASK) {
797 if (delta & UART_CTS)
798 port->icount.cts++;
799 if (delta & UART_DSR)
800 port->icount.dsr++;
801 if (delta & UART_RING)
802 port->icount.rng++;
803 if (delta & UART_DCD) {
804 port->icount.dcd++;
805 tty = tty_port_tty_get(&port->port);
806 if (tty) {
807 usb_serial_handle_dcd_change(port, tty,
808 status & UART_DCD);
809 tty_kref_put(tty);
810 }
811 }
812
813 wake_up_interruptible(&port->port.delta_msr_wait);
814 }
815 }
816
817 static void pl2303_read_int_callback(struct urb *urb)
818 {
819 struct usb_serial_port *port = urb->context;
820 unsigned char *data = urb->transfer_buffer;
821 unsigned int actual_length = urb->actual_length;
822 int status = urb->status;
823 int retval;
824
825 switch (status) {
826 case 0:
827 /* success */
828 break;
829 case -ECONNRESET:
830 case -ENOENT:
831 case -ESHUTDOWN:
832 /* this urb is terminated, clean up */
833 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
834 __func__, status);
835 return;
836 default:
837 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
838 __func__, status);
839 goto exit;
840 }
841
842 usb_serial_debug_data(&port->dev, __func__,
843 urb->actual_length, urb->transfer_buffer);
844
845 pl2303_update_line_status(port, data, actual_length);
846
847 exit:
848 retval = usb_submit_urb(urb, GFP_ATOMIC);
849 if (retval) {
850 dev_err(&port->dev,
851 "%s - usb_submit_urb failed with result %d\n",
852 __func__, retval);
853 }
854 }
855
856 static void pl2303_process_read_urb(struct urb *urb)
857 {
858 struct usb_serial_port *port = urb->context;
859 struct pl2303_private *priv = usb_get_serial_port_data(port);
860 unsigned char *data = urb->transfer_buffer;
861 char tty_flag = TTY_NORMAL;
862 unsigned long flags;
863 u8 line_status;
864 int i;
865
866 /* update line status */
867 spin_lock_irqsave(&priv->lock, flags);
868 line_status = priv->line_status;
869 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
870 spin_unlock_irqrestore(&priv->lock, flags);
871
872 if (!urb->actual_length)
873 return;
874
875 /*
876 * Break takes precedence over parity, which takes precedence over
877 * framing errors.
878 */
879 if (line_status & UART_BREAK_ERROR)
880 tty_flag = TTY_BREAK;
881 else if (line_status & UART_PARITY_ERROR)
882 tty_flag = TTY_PARITY;
883 else if (line_status & UART_FRAME_ERROR)
884 tty_flag = TTY_FRAME;
885
886 if (tty_flag != TTY_NORMAL)
887 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
888 tty_flag);
889 /* overrun is special, not associated with a char */
890 if (line_status & UART_OVERRUN_ERROR)
891 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
892
893 if (port->port.console && port->sysrq) {
894 for (i = 0; i < urb->actual_length; ++i)
895 if (!usb_serial_handle_sysrq_char(port, data[i]))
896 tty_insert_flip_char(&port->port, data[i],
897 tty_flag);
898 } else {
899 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
900 urb->actual_length);
901 }
902
903 tty_flip_buffer_push(&port->port);
904 }
905
906 static struct usb_serial_driver pl2303_device = {
907 .driver = {
908 .owner = THIS_MODULE,
909 .name = "pl2303",
910 },
911 .id_table = id_table,
912 .num_ports = 1,
913 .bulk_in_size = 256,
914 .bulk_out_size = 256,
915 .open = pl2303_open,
916 .close = pl2303_close,
917 .dtr_rts = pl2303_dtr_rts,
918 .carrier_raised = pl2303_carrier_raised,
919 .ioctl = pl2303_ioctl,
920 .break_ctl = pl2303_break_ctl,
921 .set_termios = pl2303_set_termios,
922 .tiocmget = pl2303_tiocmget,
923 .tiocmset = pl2303_tiocmset,
924 .tiocmiwait = usb_serial_generic_tiocmiwait,
925 .process_read_urb = pl2303_process_read_urb,
926 .read_int_callback = pl2303_read_int_callback,
927 .probe = pl2303_probe,
928 .attach = pl2303_startup,
929 .release = pl2303_release,
930 .port_probe = pl2303_port_probe,
931 .port_remove = pl2303_port_remove,
932 };
933
934 static struct usb_serial_driver * const serial_drivers[] = {
935 &pl2303_device, NULL
936 };
937
938 module_usb_serial_driver(serial_drivers, id_table);
939
940 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
941 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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