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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[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 static void pl2303_set_break(struct usb_serial_port *port, bool enable);
136
137 enum pl2303_type {
138 TYPE_01, /* Type 0 and 1 (difference unknown) */
139 TYPE_HX, /* HX version of the pl2303 chip */
140 TYPE_COUNT
141 };
142
143 struct pl2303_type_data {
144 speed_t max_baud_rate;
145 unsigned long quirks;
146 };
147
148 struct pl2303_serial_private {
149 const struct pl2303_type_data *type;
150 unsigned long quirks;
151 };
152
153 struct pl2303_private {
154 spinlock_t lock;
155 u8 line_control;
156 u8 line_status;
157
158 u8 line_settings[7];
159 };
160
161 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
162 [TYPE_01] = {
163 .max_baud_rate = 1228800,
164 .quirks = PL2303_QUIRK_LEGACY,
165 },
166 [TYPE_HX] = {
167 .max_baud_rate = 12000000,
168 },
169 };
170
171 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
172 unsigned char buf[1])
173 {
174 struct device *dev = &serial->interface->dev;
175 int res;
176
177 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
178 VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
179 value, 0, buf, 1, 100);
180 if (res != 1) {
181 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
182 value, res);
183 if (res >= 0)
184 res = -EIO;
185
186 return res;
187 }
188
189 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
190
191 return 0;
192 }
193
194 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
195 {
196 struct device *dev = &serial->interface->dev;
197 int res;
198
199 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
200
201 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
202 VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
203 value, index, NULL, 0, 100);
204 if (res) {
205 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
206 value, res);
207 return res;
208 }
209
210 return 0;
211 }
212
213 static int pl2303_probe(struct usb_serial *serial,
214 const struct usb_device_id *id)
215 {
216 usb_set_serial_data(serial, (void *)id->driver_info);
217
218 return 0;
219 }
220
221 static int pl2303_startup(struct usb_serial *serial)
222 {
223 struct pl2303_serial_private *spriv;
224 enum pl2303_type type = TYPE_01;
225 unsigned char *buf;
226
227 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
228 if (!spriv)
229 return -ENOMEM;
230
231 buf = kmalloc(1, GFP_KERNEL);
232 if (!buf) {
233 kfree(spriv);
234 return -ENOMEM;
235 }
236
237 if (serial->dev->descriptor.bDeviceClass == 0x02)
238 type = TYPE_01; /* type 0 */
239 else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
240 type = TYPE_HX;
241 else if (serial->dev->descriptor.bDeviceClass == 0x00)
242 type = TYPE_01; /* type 1 */
243 else if (serial->dev->descriptor.bDeviceClass == 0xFF)
244 type = TYPE_01; /* type 1 */
245 dev_dbg(&serial->interface->dev, "device type: %d\n", type);
246
247 spriv->type = &pl2303_type_data[type];
248 spriv->quirks = (unsigned long)usb_get_serial_data(serial);
249 spriv->quirks |= spriv->type->quirks;
250
251 usb_set_serial_data(serial, spriv);
252
253 pl2303_vendor_read(serial, 0x8484, buf);
254 pl2303_vendor_write(serial, 0x0404, 0);
255 pl2303_vendor_read(serial, 0x8484, buf);
256 pl2303_vendor_read(serial, 0x8383, buf);
257 pl2303_vendor_read(serial, 0x8484, buf);
258 pl2303_vendor_write(serial, 0x0404, 1);
259 pl2303_vendor_read(serial, 0x8484, buf);
260 pl2303_vendor_read(serial, 0x8383, buf);
261 pl2303_vendor_write(serial, 0, 1);
262 pl2303_vendor_write(serial, 1, 0);
263 if (spriv->quirks & PL2303_QUIRK_LEGACY)
264 pl2303_vendor_write(serial, 2, 0x24);
265 else
266 pl2303_vendor_write(serial, 2, 0x44);
267
268 kfree(buf);
269
270 return 0;
271 }
272
273 static void pl2303_release(struct usb_serial *serial)
274 {
275 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
276
277 kfree(spriv);
278 }
279
280 static int pl2303_port_probe(struct usb_serial_port *port)
281 {
282 struct pl2303_private *priv;
283
284 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
285 if (!priv)
286 return -ENOMEM;
287
288 spin_lock_init(&priv->lock);
289
290 usb_set_serial_port_data(port, priv);
291
292 port->port.drain_delay = 256;
293
294 return 0;
295 }
296
297 static int pl2303_port_remove(struct usb_serial_port *port)
298 {
299 struct pl2303_private *priv = usb_get_serial_port_data(port);
300
301 kfree(priv);
302
303 return 0;
304 }
305
306 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
307 {
308 struct usb_device *dev = port->serial->dev;
309 int retval;
310
311 dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
312
313 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
314 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
315 value, 0, NULL, 0, 100);
316 if (retval)
317 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
318
319 return retval;
320 }
321
322 /*
323 * Returns the nearest supported baud rate that can be set directly without
324 * using divisors.
325 */
326 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
327 {
328 static const speed_t baud_sup[] = {
329 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
330 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
331 614400, 921600, 1228800, 2457600, 3000000, 6000000
332 };
333
334 unsigned i;
335
336 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
337 if (baud_sup[i] > baud)
338 break;
339 }
340
341 if (i == ARRAY_SIZE(baud_sup))
342 baud = baud_sup[i - 1];
343 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
344 baud = baud_sup[i - 1];
345 else
346 baud = baud_sup[i];
347
348 return baud;
349 }
350
351 /*
352 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
353 * use 9600 baud.
354 */
355 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
356 speed_t baud)
357 {
358 put_unaligned_le32(baud, buf);
359
360 return baud;
361 }
362
363 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
364 speed_t baud)
365 {
366 unsigned int tmp;
367
368 /*
369 * Apparently the formula is:
370 * baudrate = 12M * 32 / (2^buf[1]) / buf[0]
371 */
372 tmp = 12000000 * 32 / baud;
373 buf[3] = 0x80;
374 buf[2] = 0;
375 buf[1] = (tmp >= 256);
376 while (tmp >= 256) {
377 tmp >>= 2;
378 buf[1] <<= 1;
379 }
380 buf[0] = tmp;
381
382 return baud;
383 }
384
385 static void pl2303_encode_baud_rate(struct tty_struct *tty,
386 struct usb_serial_port *port,
387 u8 buf[4])
388 {
389 struct usb_serial *serial = port->serial;
390 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
391 speed_t baud_sup;
392 speed_t baud;
393
394 baud = tty_get_baud_rate(tty);
395 dev_dbg(&port->dev, "baud requested = %u\n", baud);
396 if (!baud)
397 return;
398
399 if (spriv->type->max_baud_rate)
400 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
401 /*
402 * Use direct method for supported baud rates, otherwise use divisors.
403 */
404 baud_sup = pl2303_get_supported_baud_rate(baud);
405
406 if (baud == baud_sup)
407 baud = pl2303_encode_baud_rate_direct(buf, baud);
408 else
409 baud = pl2303_encode_baud_rate_divisor(buf, baud);
410
411 /* Save resulting baud rate */
412 tty_encode_baud_rate(tty, baud, baud);
413 dev_dbg(&port->dev, "baud set = %u\n", baud);
414 }
415
416 static int pl2303_get_line_request(struct usb_serial_port *port,
417 unsigned char buf[7])
418 {
419 struct usb_device *udev = port->serial->dev;
420 int ret;
421
422 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
423 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
424 0, 0, buf, 7, 100);
425 if (ret != 7) {
426 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
427
428 if (ret > 0)
429 ret = -EIO;
430
431 return ret;
432 }
433
434 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
435
436 return 0;
437 }
438
439 static int pl2303_set_line_request(struct usb_serial_port *port,
440 unsigned char buf[7])
441 {
442 struct usb_device *udev = port->serial->dev;
443 int ret;
444
445 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
446 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
447 0, 0, buf, 7, 100);
448 if (ret != 7) {
449 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
450
451 if (ret > 0)
452 ret = -EIO;
453
454 return ret;
455 }
456
457 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
458
459 return 0;
460 }
461
462 static void pl2303_set_termios(struct tty_struct *tty,
463 struct usb_serial_port *port, struct ktermios *old_termios)
464 {
465 struct usb_serial *serial = port->serial;
466 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
467 struct pl2303_private *priv = usb_get_serial_port_data(port);
468 unsigned long flags;
469 unsigned char *buf;
470 int ret;
471 u8 control;
472
473 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
474 return;
475
476 buf = kzalloc(7, GFP_KERNEL);
477 if (!buf) {
478 /* Report back no change occurred */
479 if (old_termios)
480 tty->termios = *old_termios;
481 return;
482 }
483
484 pl2303_get_line_request(port, buf);
485
486 switch (C_CSIZE(tty)) {
487 case CS5:
488 buf[6] = 5;
489 break;
490 case CS6:
491 buf[6] = 6;
492 break;
493 case CS7:
494 buf[6] = 7;
495 break;
496 default:
497 case CS8:
498 buf[6] = 8;
499 }
500 dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
501
502 /* For reference buf[0]:buf[3] baud rate value */
503 pl2303_encode_baud_rate(tty, port, &buf[0]);
504
505 /* For reference buf[4]=0 is 1 stop bits */
506 /* For reference buf[4]=1 is 1.5 stop bits */
507 /* For reference buf[4]=2 is 2 stop bits */
508 if (C_CSTOPB(tty)) {
509 /*
510 * NOTE: Comply with "real" UARTs / RS232:
511 * use 1.5 instead of 2 stop bits with 5 data bits
512 */
513 if (C_CSIZE(tty) == CS5) {
514 buf[4] = 1;
515 dev_dbg(&port->dev, "stop bits = 1.5\n");
516 } else {
517 buf[4] = 2;
518 dev_dbg(&port->dev, "stop bits = 2\n");
519 }
520 } else {
521 buf[4] = 0;
522 dev_dbg(&port->dev, "stop bits = 1\n");
523 }
524
525 if (C_PARENB(tty)) {
526 /* For reference buf[5]=0 is none parity */
527 /* For reference buf[5]=1 is odd parity */
528 /* For reference buf[5]=2 is even parity */
529 /* For reference buf[5]=3 is mark parity */
530 /* For reference buf[5]=4 is space parity */
531 if (C_PARODD(tty)) {
532 if (C_CMSPAR(tty)) {
533 buf[5] = 3;
534 dev_dbg(&port->dev, "parity = mark\n");
535 } else {
536 buf[5] = 1;
537 dev_dbg(&port->dev, "parity = odd\n");
538 }
539 } else {
540 if (C_CMSPAR(tty)) {
541 buf[5] = 4;
542 dev_dbg(&port->dev, "parity = space\n");
543 } else {
544 buf[5] = 2;
545 dev_dbg(&port->dev, "parity = even\n");
546 }
547 }
548 } else {
549 buf[5] = 0;
550 dev_dbg(&port->dev, "parity = none\n");
551 }
552
553 /*
554 * Some PL2303 are known to lose bytes if you change serial settings
555 * even to the same values as before. Thus we actually need to filter
556 * in this specific case.
557 *
558 * Note that the tty_termios_hw_change check above is not sufficient
559 * as a previously requested baud rate may differ from the one
560 * actually used (and stored in old_termios).
561 *
562 * NOTE: No additional locking needed for line_settings as it is
563 * only used in set_termios, which is serialised against itself.
564 */
565 if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
566 ret = pl2303_set_line_request(port, buf);
567 if (!ret)
568 memcpy(priv->line_settings, buf, 7);
569 }
570
571 /* change control lines if we are switching to or from B0 */
572 spin_lock_irqsave(&priv->lock, flags);
573 control = priv->line_control;
574 if (C_BAUD(tty) == B0)
575 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
576 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
577 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
578 if (control != priv->line_control) {
579 control = priv->line_control;
580 spin_unlock_irqrestore(&priv->lock, flags);
581 pl2303_set_control_lines(port, control);
582 } else {
583 spin_unlock_irqrestore(&priv->lock, flags);
584 }
585
586 if (C_CRTSCTS(tty)) {
587 if (spriv->quirks & PL2303_QUIRK_LEGACY)
588 pl2303_vendor_write(serial, 0x0, 0x41);
589 else
590 pl2303_vendor_write(serial, 0x0, 0x61);
591 } else {
592 pl2303_vendor_write(serial, 0x0, 0x0);
593 }
594
595 kfree(buf);
596 }
597
598 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
599 {
600 struct pl2303_private *priv = usb_get_serial_port_data(port);
601 unsigned long flags;
602 u8 control;
603
604 spin_lock_irqsave(&priv->lock, flags);
605 if (on)
606 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
607 else
608 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
609 control = priv->line_control;
610 spin_unlock_irqrestore(&priv->lock, flags);
611
612 pl2303_set_control_lines(port, control);
613 }
614
615 static void pl2303_close(struct usb_serial_port *port)
616 {
617 usb_serial_generic_close(port);
618 usb_kill_urb(port->interrupt_in_urb);
619 pl2303_set_break(port, false);
620 }
621
622 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
623 {
624 struct usb_serial *serial = port->serial;
625 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
626 int result;
627
628 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
629 usb_clear_halt(serial->dev, port->write_urb->pipe);
630 usb_clear_halt(serial->dev, port->read_urb->pipe);
631 } else {
632 /* reset upstream data pipes */
633 pl2303_vendor_write(serial, 8, 0);
634 pl2303_vendor_write(serial, 9, 0);
635 }
636
637 /* Setup termios */
638 if (tty)
639 pl2303_set_termios(tty, port, NULL);
640
641 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
642 if (result) {
643 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
644 result);
645 return result;
646 }
647
648 result = usb_serial_generic_open(tty, port);
649 if (result) {
650 usb_kill_urb(port->interrupt_in_urb);
651 return result;
652 }
653
654 return 0;
655 }
656
657 static int pl2303_tiocmset(struct tty_struct *tty,
658 unsigned int set, unsigned int clear)
659 {
660 struct usb_serial_port *port = tty->driver_data;
661 struct pl2303_private *priv = usb_get_serial_port_data(port);
662 unsigned long flags;
663 u8 control;
664 int ret;
665
666 spin_lock_irqsave(&priv->lock, flags);
667 if (set & TIOCM_RTS)
668 priv->line_control |= CONTROL_RTS;
669 if (set & TIOCM_DTR)
670 priv->line_control |= CONTROL_DTR;
671 if (clear & TIOCM_RTS)
672 priv->line_control &= ~CONTROL_RTS;
673 if (clear & TIOCM_DTR)
674 priv->line_control &= ~CONTROL_DTR;
675 control = priv->line_control;
676 spin_unlock_irqrestore(&priv->lock, flags);
677
678 ret = pl2303_set_control_lines(port, control);
679 if (ret)
680 return usb_translate_errors(ret);
681
682 return 0;
683 }
684
685 static int pl2303_tiocmget(struct tty_struct *tty)
686 {
687 struct usb_serial_port *port = tty->driver_data;
688 struct pl2303_private *priv = usb_get_serial_port_data(port);
689 unsigned long flags;
690 unsigned int mcr;
691 unsigned int status;
692 unsigned int result;
693
694 spin_lock_irqsave(&priv->lock, flags);
695 mcr = priv->line_control;
696 status = priv->line_status;
697 spin_unlock_irqrestore(&priv->lock, flags);
698
699 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
700 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
701 | ((status & UART_CTS) ? TIOCM_CTS : 0)
702 | ((status & UART_DSR) ? TIOCM_DSR : 0)
703 | ((status & UART_RING) ? TIOCM_RI : 0)
704 | ((status & UART_DCD) ? TIOCM_CD : 0);
705
706 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
707
708 return result;
709 }
710
711 static int pl2303_carrier_raised(struct usb_serial_port *port)
712 {
713 struct pl2303_private *priv = usb_get_serial_port_data(port);
714
715 if (priv->line_status & UART_DCD)
716 return 1;
717
718 return 0;
719 }
720
721 static int pl2303_ioctl(struct tty_struct *tty,
722 unsigned int cmd, unsigned long arg)
723 {
724 struct serial_struct ser;
725 struct usb_serial_port *port = tty->driver_data;
726
727 switch (cmd) {
728 case TIOCGSERIAL:
729 memset(&ser, 0, sizeof ser);
730 ser.type = PORT_16654;
731 ser.line = port->minor;
732 ser.port = port->port_number;
733 ser.baud_base = 460800;
734
735 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
736 return -EFAULT;
737
738 return 0;
739 default:
740 break;
741 }
742
743 return -ENOIOCTLCMD;
744 }
745
746 static void pl2303_set_break(struct usb_serial_port *port, bool enable)
747 {
748 struct usb_serial *serial = port->serial;
749 u16 state;
750 int result;
751
752 if (enable)
753 state = BREAK_ON;
754 else
755 state = BREAK_OFF;
756
757 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
758 state == BREAK_OFF ? "off" : "on");
759
760 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
761 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
762 0, NULL, 0, 100);
763 if (result)
764 dev_err(&port->dev, "error sending break = %d\n", result);
765 }
766
767 static void pl2303_break_ctl(struct tty_struct *tty, int state)
768 {
769 struct usb_serial_port *port = tty->driver_data;
770
771 pl2303_set_break(port, state);
772 }
773
774 static void pl2303_update_line_status(struct usb_serial_port *port,
775 unsigned char *data,
776 unsigned int actual_length)
777 {
778 struct usb_serial *serial = port->serial;
779 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
780 struct pl2303_private *priv = usb_get_serial_port_data(port);
781 struct tty_struct *tty;
782 unsigned long flags;
783 unsigned int status_idx = UART_STATE_INDEX;
784 u8 status;
785 u8 delta;
786
787 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
788 status_idx = 0;
789
790 if (actual_length < status_idx + 1)
791 return;
792
793 status = data[status_idx];
794
795 /* Save off the uart status for others to look at */
796 spin_lock_irqsave(&priv->lock, flags);
797 delta = priv->line_status ^ status;
798 priv->line_status = status;
799 spin_unlock_irqrestore(&priv->lock, flags);
800
801 if (status & UART_BREAK_ERROR)
802 usb_serial_handle_break(port);
803
804 if (delta & UART_STATE_MSR_MASK) {
805 if (delta & UART_CTS)
806 port->icount.cts++;
807 if (delta & UART_DSR)
808 port->icount.dsr++;
809 if (delta & UART_RING)
810 port->icount.rng++;
811 if (delta & UART_DCD) {
812 port->icount.dcd++;
813 tty = tty_port_tty_get(&port->port);
814 if (tty) {
815 usb_serial_handle_dcd_change(port, tty,
816 status & UART_DCD);
817 tty_kref_put(tty);
818 }
819 }
820
821 wake_up_interruptible(&port->port.delta_msr_wait);
822 }
823 }
824
825 static void pl2303_read_int_callback(struct urb *urb)
826 {
827 struct usb_serial_port *port = urb->context;
828 unsigned char *data = urb->transfer_buffer;
829 unsigned int actual_length = urb->actual_length;
830 int status = urb->status;
831 int retval;
832
833 switch (status) {
834 case 0:
835 /* success */
836 break;
837 case -ECONNRESET:
838 case -ENOENT:
839 case -ESHUTDOWN:
840 /* this urb is terminated, clean up */
841 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
842 __func__, status);
843 return;
844 default:
845 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
846 __func__, status);
847 goto exit;
848 }
849
850 usb_serial_debug_data(&port->dev, __func__,
851 urb->actual_length, urb->transfer_buffer);
852
853 pl2303_update_line_status(port, data, actual_length);
854
855 exit:
856 retval = usb_submit_urb(urb, GFP_ATOMIC);
857 if (retval) {
858 dev_err(&port->dev,
859 "%s - usb_submit_urb failed with result %d\n",
860 __func__, retval);
861 }
862 }
863
864 static void pl2303_process_read_urb(struct urb *urb)
865 {
866 struct usb_serial_port *port = urb->context;
867 struct pl2303_private *priv = usb_get_serial_port_data(port);
868 unsigned char *data = urb->transfer_buffer;
869 char tty_flag = TTY_NORMAL;
870 unsigned long flags;
871 u8 line_status;
872 int i;
873
874 /* update line status */
875 spin_lock_irqsave(&priv->lock, flags);
876 line_status = priv->line_status;
877 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
878 spin_unlock_irqrestore(&priv->lock, flags);
879
880 if (!urb->actual_length)
881 return;
882
883 /*
884 * Break takes precedence over parity, which takes precedence over
885 * framing errors.
886 */
887 if (line_status & UART_BREAK_ERROR)
888 tty_flag = TTY_BREAK;
889 else if (line_status & UART_PARITY_ERROR)
890 tty_flag = TTY_PARITY;
891 else if (line_status & UART_FRAME_ERROR)
892 tty_flag = TTY_FRAME;
893
894 if (tty_flag != TTY_NORMAL)
895 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
896 tty_flag);
897 /* overrun is special, not associated with a char */
898 if (line_status & UART_OVERRUN_ERROR)
899 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
900
901 if (port->port.console && port->sysrq) {
902 for (i = 0; i < urb->actual_length; ++i)
903 if (!usb_serial_handle_sysrq_char(port, data[i]))
904 tty_insert_flip_char(&port->port, data[i],
905 tty_flag);
906 } else {
907 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
908 urb->actual_length);
909 }
910
911 tty_flip_buffer_push(&port->port);
912 }
913
914 static struct usb_serial_driver pl2303_device = {
915 .driver = {
916 .owner = THIS_MODULE,
917 .name = "pl2303",
918 },
919 .id_table = id_table,
920 .num_ports = 1,
921 .bulk_in_size = 256,
922 .bulk_out_size = 256,
923 .open = pl2303_open,
924 .close = pl2303_close,
925 .dtr_rts = pl2303_dtr_rts,
926 .carrier_raised = pl2303_carrier_raised,
927 .ioctl = pl2303_ioctl,
928 .break_ctl = pl2303_break_ctl,
929 .set_termios = pl2303_set_termios,
930 .tiocmget = pl2303_tiocmget,
931 .tiocmset = pl2303_tiocmset,
932 .tiocmiwait = usb_serial_generic_tiocmiwait,
933 .process_read_urb = pl2303_process_read_urb,
934 .read_int_callback = pl2303_read_int_callback,
935 .probe = pl2303_probe,
936 .attach = pl2303_startup,
937 .release = pl2303_release,
938 .port_probe = pl2303_port_probe,
939 .port_remove = pl2303_port_remove,
940 };
941
942 static struct usb_serial_driver * const serial_drivers[] = {
943 &pl2303_device, NULL
944 };
945
946 module_usb_serial_driver(serial_drivers, id_table);
947
948 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
949 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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