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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / usb / serial / pl2303.c
blob2e22fc22c3822fdf7b499417a2742702147d1d3c
1 /*
2 * Prolific PL2303 USB to serial adaptor driver
3 *
4 * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
5 * Copyright (C) 2003 IBM Corp.
6 *
7 * Original driver for 2.2.x by anonymous
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License version
11 * 2 as published by the Free Software Foundation.
12 *
13 * See Documentation/usb/usb-serial.txt for more information on using this
14 * driver
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/errno.h>
19 #include <linux/slab.h>
20 #include <linux/tty.h>
21 #include <linux/tty_driver.h>
22 #include <linux/tty_flip.h>
23 #include <linux/serial.h>
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <linux/spinlock.h>
27 #include <linux/uaccess.h>
28 #include <linux/usb.h>
29 #include <linux/usb/serial.h>
30 #include <asm/unaligned.h>
31 #include "pl2303.h"
32
33
34 #define PL2303_QUIRK_UART_STATE_IDX0 BIT(0)
35 #define PL2303_QUIRK_LEGACY BIT(1)
36
37 static const struct usb_device_id id_table[] = {
38 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
39 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
40 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
41 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
42 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
43 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ALDIGA) },
44 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MMX) },
45 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_GPRS) },
46 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_HCR331) },
47 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_MOTOROLA) },
48 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
49 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
50 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
51 { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
52 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
53 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
54 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
55 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
56 { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
57 { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
58 { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
59 { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
60 { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
61 { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
62 { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
63 { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
64 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1),
65 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
66 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65),
67 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
68 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
69 .driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
70 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) },
71 { USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
72 { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
73 { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
74 { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
75 { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
76 { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
77 { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
78 { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
79 { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
80 { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
81 { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
82 { USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
83 { USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
84 { USB_DEVICE(SUPERIAL_VENDOR_ID, SUPERIAL_PRODUCT_ID) },
85 { USB_DEVICE(HP_VENDOR_ID, HP_LD220_PRODUCT_ID) },
86 { USB_DEVICE(CRESSI_VENDOR_ID, CRESSI_EDY_PRODUCT_ID) },
87 { USB_DEVICE(ZEAGLE_VENDOR_ID, ZEAGLE_N2ITION3_PRODUCT_ID) },
88 { USB_DEVICE(SONY_VENDOR_ID, SONY_QN3USB_PRODUCT_ID) },
89 { USB_DEVICE(SANWA_VENDOR_ID, SANWA_PRODUCT_ID) },
90 { USB_DEVICE(ADLINK_VENDOR_ID, ADLINK_ND6530_PRODUCT_ID) },
91 { USB_DEVICE(SMART_VENDOR_ID, SMART_PRODUCT_ID) },
92 { } /* Terminating entry */
93 };
94
95 MODULE_DEVICE_TABLE(usb, id_table);
96
97 #define SET_LINE_REQUEST_TYPE 0x21
98 #define SET_LINE_REQUEST 0x20
99
100 #define SET_CONTROL_REQUEST_TYPE 0x21
101 #define SET_CONTROL_REQUEST 0x22
102 #define CONTROL_DTR 0x01
103 #define CONTROL_RTS 0x02
104
105 #define BREAK_REQUEST_TYPE 0x21
106 #define BREAK_REQUEST 0x23
107 #define BREAK_ON 0xffff
108 #define BREAK_OFF 0x0000
109
110 #define GET_LINE_REQUEST_TYPE 0xa1
111 #define GET_LINE_REQUEST 0x21
112
113 #define VENDOR_WRITE_REQUEST_TYPE 0x40
114 #define VENDOR_WRITE_REQUEST 0x01
115
116 #define VENDOR_READ_REQUEST_TYPE 0xc0
117 #define VENDOR_READ_REQUEST 0x01
118
119 #define UART_STATE_INDEX 8
120 #define UART_STATE_MSR_MASK 0x8b
121 #define UART_STATE_TRANSIENT_MASK 0x74
122 #define UART_DCD 0x01
123 #define UART_DSR 0x02
124 #define UART_BREAK_ERROR 0x04
125 #define UART_RING 0x08
126 #define UART_FRAME_ERROR 0x10
127 #define UART_PARITY_ERROR 0x20
128 #define UART_OVERRUN_ERROR 0x40
129 #define UART_CTS 0x80
130
131
132 enum pl2303_type {
133 TYPE_01, /* Type 0 and 1 (difference unknown) */
134 TYPE_HX, /* HX version of the pl2303 chip */
135 TYPE_COUNT
136 };
137
138 struct pl2303_type_data {
139 speed_t max_baud_rate;
140 unsigned long quirks;
141 };
142
143 struct pl2303_serial_private {
144 const struct pl2303_type_data *type;
145 unsigned long quirks;
146 };
147
148 struct pl2303_private {
149 spinlock_t lock;
150 u8 line_control;
151 u8 line_status;
152
153 u8 line_settings[7];
154 };
155
156 static const struct pl2303_type_data pl2303_type_data[TYPE_COUNT] = {
157 [TYPE_01] = {
158 .max_baud_rate = 1228800,
159 .quirks = PL2303_QUIRK_LEGACY,
160 },
161 };
162
163 static int pl2303_vendor_read(struct usb_serial *serial, u16 value,
164 unsigned char buf[1])
165 {
166 struct device *dev = &serial->interface->dev;
167 int res;
168
169 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
170 VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
171 value, 0, buf, 1, 100);
172 if (res != 1) {
173 dev_err(dev, "%s - failed to read [%04x]: %d\n", __func__,
174 value, res);
175 if (res >= 0)
176 res = -EIO;
177
178 return res;
179 }
180
181 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, buf[0]);
182
183 return 0;
184 }
185
186 static int pl2303_vendor_write(struct usb_serial *serial, u16 value, u16 index)
187 {
188 struct device *dev = &serial->interface->dev;
189 int res;
190
191 dev_dbg(dev, "%s - [%04x] = %02x\n", __func__, value, index);
192
193 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
194 VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
195 value, index, NULL, 0, 100);
196 if (res) {
197 dev_err(dev, "%s - failed to write [%04x]: %d\n", __func__,
198 value, res);
199 return res;
200 }
201
202 return 0;
203 }
204
205 static int pl2303_probe(struct usb_serial *serial,
206 const struct usb_device_id *id)
207 {
208 usb_set_serial_data(serial, (void *)id->driver_info);
209
210 return 0;
211 }
212
213 static int pl2303_startup(struct usb_serial *serial)
214 {
215 struct pl2303_serial_private *spriv;
216 enum pl2303_type type = TYPE_01;
217 unsigned char *buf;
218
219 spriv = kzalloc(sizeof(*spriv), GFP_KERNEL);
220 if (!spriv)
221 return -ENOMEM;
222
223 buf = kmalloc(1, GFP_KERNEL);
224 if (!buf) {
225 kfree(spriv);
226 return -ENOMEM;
227 }
228
229 if (serial->dev->descriptor.bDeviceClass == 0x02)
230 type = TYPE_01; /* type 0 */
231 else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
232 type = TYPE_HX;
233 else if (serial->dev->descriptor.bDeviceClass == 0x00)
234 type = TYPE_01; /* type 1 */
235 else if (serial->dev->descriptor.bDeviceClass == 0xFF)
236 type = TYPE_01; /* type 1 */
237 dev_dbg(&serial->interface->dev, "device type: %d\n", type);
238
239 spriv->type = &pl2303_type_data[type];
240 spriv->quirks = (unsigned long)usb_get_serial_data(serial);
241 spriv->quirks |= spriv->type->quirks;
242
243 usb_set_serial_data(serial, spriv);
244
245 pl2303_vendor_read(serial, 0x8484, buf);
246 pl2303_vendor_write(serial, 0x0404, 0);
247 pl2303_vendor_read(serial, 0x8484, buf);
248 pl2303_vendor_read(serial, 0x8383, buf);
249 pl2303_vendor_read(serial, 0x8484, buf);
250 pl2303_vendor_write(serial, 0x0404, 1);
251 pl2303_vendor_read(serial, 0x8484, buf);
252 pl2303_vendor_read(serial, 0x8383, buf);
253 pl2303_vendor_write(serial, 0, 1);
254 pl2303_vendor_write(serial, 1, 0);
255 if (spriv->quirks & PL2303_QUIRK_LEGACY)
256 pl2303_vendor_write(serial, 2, 0x24);
257 else
258 pl2303_vendor_write(serial, 2, 0x44);
259
260 kfree(buf);
261
262 return 0;
263 }
264
265 static void pl2303_release(struct usb_serial *serial)
266 {
267 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
268
269 kfree(spriv);
270 }
271
272 static int pl2303_port_probe(struct usb_serial_port *port)
273 {
274 struct pl2303_private *priv;
275
276 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
277 if (!priv)
278 return -ENOMEM;
279
280 spin_lock_init(&priv->lock);
281
282 usb_set_serial_port_data(port, priv);
283
284 port->port.drain_delay = 256;
285
286 return 0;
287 }
288
289 static int pl2303_port_remove(struct usb_serial_port *port)
290 {
291 struct pl2303_private *priv = usb_get_serial_port_data(port);
292
293 kfree(priv);
294
295 return 0;
296 }
297
298 static int pl2303_set_control_lines(struct usb_serial_port *port, u8 value)
299 {
300 struct usb_device *dev = port->serial->dev;
301 int retval;
302
303 dev_dbg(&port->dev, "%s - %02x\n", __func__, value);
304
305 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
306 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
307 value, 0, NULL, 0, 100);
308 if (retval)
309 dev_err(&port->dev, "%s - failed: %d\n", __func__, retval);
310
311 return retval;
312 }
313
314 /*
315 * Returns the nearest supported baud rate that can be set directly without
316 * using divisors.
317 */
318 static speed_t pl2303_get_supported_baud_rate(speed_t baud)
319 {
320 static const speed_t baud_sup[] = {
321 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,
322 14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,
323 614400, 921600, 1228800, 2457600, 3000000, 6000000
324 };
325
326 unsigned i;
327
328 for (i = 0; i < ARRAY_SIZE(baud_sup); ++i) {
329 if (baud_sup[i] > baud)
330 break;
331 }
332
333 if (i == ARRAY_SIZE(baud_sup))
334 baud = baud_sup[i - 1];
335 else if (i > 0 && (baud_sup[i] - baud) > (baud - baud_sup[i - 1]))
336 baud = baud_sup[i - 1];
337 else
338 baud = baud_sup[i];
339
340 return baud;
341 }
342
343 /*
344 * NOTE: If unsupported baud rates are set directly, the PL2303 seems to
345 * use 9600 baud.
346 */
347 static speed_t pl2303_encode_baud_rate_direct(unsigned char buf[4],
348 speed_t baud)
349 {
350 put_unaligned_le32(baud, buf);
351
352 return baud;
353 }
354
355 static speed_t pl2303_encode_baud_rate_divisor(unsigned char buf[4],
356 speed_t baud)
357 {
358 unsigned int tmp;
359
360 /*
361 * Apparently the formula is:
362 * baudrate = 12M * 32 / (2^buf[1]) / buf[0]
363 */
364 tmp = 12000000 * 32 / baud;
365 buf[3] = 0x80;
366 buf[2] = 0;
367 buf[1] = (tmp >= 256);
368 while (tmp >= 256) {
369 tmp >>= 2;
370 buf[1] <<= 1;
371 }
372 buf[0] = tmp;
373
374 return baud;
375 }
376
377 static void pl2303_encode_baud_rate(struct tty_struct *tty,
378 struct usb_serial_port *port,
379 u8 buf[4])
380 {
381 struct usb_serial *serial = port->serial;
382 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
383 speed_t baud_sup;
384 speed_t baud;
385
386 baud = tty_get_baud_rate(tty);
387 dev_dbg(&port->dev, "baud requested = %u\n", baud);
388 if (!baud)
389 return;
390
391 if (spriv->type->max_baud_rate)
392 baud = min_t(speed_t, baud, spriv->type->max_baud_rate);
393 /*
394 * Set baud rate to nearest supported value.
395 *
396 * NOTE: Baud rate 500k can only be set using divisors.
397 */
398 baud_sup = pl2303_get_supported_baud_rate(baud);
399
400 if (baud == 500000)
401 baud = pl2303_encode_baud_rate_divisor(buf, baud);
402 else
403 baud = pl2303_encode_baud_rate_direct(buf, baud_sup);
404
405 /* Save resulting baud rate */
406 tty_encode_baud_rate(tty, baud, baud);
407 dev_dbg(&port->dev, "baud set = %u\n", baud);
408 }
409
410 static int pl2303_get_line_request(struct usb_serial_port *port,
411 unsigned char buf[7])
412 {
413 struct usb_device *udev = port->serial->dev;
414 int ret;
415
416 ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
417 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
418 0, 0, buf, 7, 100);
419 if (ret != 7) {
420 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
421
422 if (ret > 0)
423 ret = -EIO;
424
425 return ret;
426 }
427
428 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
429
430 return 0;
431 }
432
433 static int pl2303_set_line_request(struct usb_serial_port *port,
434 unsigned char buf[7])
435 {
436 struct usb_device *udev = port->serial->dev;
437 int ret;
438
439 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
440 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
441 0, 0, buf, 7, 100);
442 if (ret != 7) {
443 dev_err(&port->dev, "%s - failed: %d\n", __func__, ret);
444
445 if (ret > 0)
446 ret = -EIO;
447
448 return ret;
449 }
450
451 dev_dbg(&port->dev, "%s - %7ph\n", __func__, buf);
452
453 return 0;
454 }
455
456 static void pl2303_set_termios(struct tty_struct *tty,
457 struct usb_serial_port *port, struct ktermios *old_termios)
458 {
459 struct usb_serial *serial = port->serial;
460 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
461 struct pl2303_private *priv = usb_get_serial_port_data(port);
462 unsigned long flags;
463 unsigned char *buf;
464 int ret;
465 u8 control;
466
467 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
468 return;
469
470 buf = kzalloc(7, GFP_KERNEL);
471 if (!buf) {
472 /* Report back no change occurred */
473 if (old_termios)
474 tty->termios = *old_termios;
475 return;
476 }
477
478 pl2303_get_line_request(port, buf);
479
480 switch (C_CSIZE(tty)) {
481 case CS5:
482 buf[6] = 5;
483 break;
484 case CS6:
485 buf[6] = 6;
486 break;
487 case CS7:
488 buf[6] = 7;
489 break;
490 default:
491 case CS8:
492 buf[6] = 8;
493 }
494 dev_dbg(&port->dev, "data bits = %d\n", buf[6]);
495
496 /* For reference buf[0]:buf[3] baud rate value */
497 pl2303_encode_baud_rate(tty, port, &buf[0]);
498
499 /* For reference buf[4]=0 is 1 stop bits */
500 /* For reference buf[4]=1 is 1.5 stop bits */
501 /* For reference buf[4]=2 is 2 stop bits */
502 if (C_CSTOPB(tty)) {
503 /*
504 * NOTE: Comply with "real" UARTs / RS232:
505 * use 1.5 instead of 2 stop bits with 5 data bits
506 */
507 if (C_CSIZE(tty) == CS5) {
508 buf[4] = 1;
509 dev_dbg(&port->dev, "stop bits = 1.5\n");
510 } else {
511 buf[4] = 2;
512 dev_dbg(&port->dev, "stop bits = 2\n");
513 }
514 } else {
515 buf[4] = 0;
516 dev_dbg(&port->dev, "stop bits = 1\n");
517 }
518
519 if (C_PARENB(tty)) {
520 /* For reference buf[5]=0 is none parity */
521 /* For reference buf[5]=1 is odd parity */
522 /* For reference buf[5]=2 is even parity */
523 /* For reference buf[5]=3 is mark parity */
524 /* For reference buf[5]=4 is space parity */
525 if (C_PARODD(tty)) {
526 if (C_CMSPAR(tty)) {
527 buf[5] = 3;
528 dev_dbg(&port->dev, "parity = mark\n");
529 } else {
530 buf[5] = 1;
531 dev_dbg(&port->dev, "parity = odd\n");
532 }
533 } else {
534 if (C_CMSPAR(tty)) {
535 buf[5] = 4;
536 dev_dbg(&port->dev, "parity = space\n");
537 } else {
538 buf[5] = 2;
539 dev_dbg(&port->dev, "parity = even\n");
540 }
541 }
542 } else {
543 buf[5] = 0;
544 dev_dbg(&port->dev, "parity = none\n");
545 }
546
547 /*
548 * Some PL2303 are known to lose bytes if you change serial settings
549 * even to the same values as before. Thus we actually need to filter
550 * in this specific case.
551 *
552 * Note that the tty_termios_hw_change check above is not sufficient
553 * as a previously requested baud rate may differ from the one
554 * actually used (and stored in old_termios).
555 *
556 * NOTE: No additional locking needed for line_settings as it is
557 * only used in set_termios, which is serialised against itself.
558 */
559 if (!old_termios || memcmp(buf, priv->line_settings, 7)) {
560 ret = pl2303_set_line_request(port, buf);
561 if (!ret)
562 memcpy(priv->line_settings, buf, 7);
563 }
564
565 /* change control lines if we are switching to or from B0 */
566 spin_lock_irqsave(&priv->lock, flags);
567 control = priv->line_control;
568 if (C_BAUD(tty) == B0)
569 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
570 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
571 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
572 if (control != priv->line_control) {
573 control = priv->line_control;
574 spin_unlock_irqrestore(&priv->lock, flags);
575 pl2303_set_control_lines(port, control);
576 } else {
577 spin_unlock_irqrestore(&priv->lock, flags);
578 }
579
580 if (C_CRTSCTS(tty)) {
581 if (spriv->quirks & PL2303_QUIRK_LEGACY)
582 pl2303_vendor_write(serial, 0x0, 0x41);
583 else
584 pl2303_vendor_write(serial, 0x0, 0x61);
585 } else {
586 pl2303_vendor_write(serial, 0x0, 0x0);
587 }
588
589 kfree(buf);
590 }
591
592 static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
593 {
594 struct pl2303_private *priv = usb_get_serial_port_data(port);
595 unsigned long flags;
596 u8 control;
597
598 spin_lock_irqsave(&priv->lock, flags);
599 if (on)
600 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
601 else
602 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
603 control = priv->line_control;
604 spin_unlock_irqrestore(&priv->lock, flags);
605
606 pl2303_set_control_lines(port, control);
607 }
608
609 static void pl2303_close(struct usb_serial_port *port)
610 {
611 usb_serial_generic_close(port);
612 usb_kill_urb(port->interrupt_in_urb);
613 }
614
615 static int pl2303_open(struct tty_struct *tty, struct usb_serial_port *port)
616 {
617 struct usb_serial *serial = port->serial;
618 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
619 int result;
620
621 if (spriv->quirks & PL2303_QUIRK_LEGACY) {
622 usb_clear_halt(serial->dev, port->write_urb->pipe);
623 usb_clear_halt(serial->dev, port->read_urb->pipe);
624 } else {
625 /* reset upstream data pipes */
626 pl2303_vendor_write(serial, 8, 0);
627 pl2303_vendor_write(serial, 9, 0);
628 }
629
630 /* Setup termios */
631 if (tty)
632 pl2303_set_termios(tty, port, NULL);
633
634 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
635 if (result) {
636 dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
637 result);
638 return result;
639 }
640
641 result = usb_serial_generic_open(tty, port);
642 if (result) {
643 usb_kill_urb(port->interrupt_in_urb);
644 return result;
645 }
646
647 return 0;
648 }
649
650 static int pl2303_tiocmset(struct tty_struct *tty,
651 unsigned int set, unsigned int clear)
652 {
653 struct usb_serial_port *port = tty->driver_data;
654 struct pl2303_private *priv = usb_get_serial_port_data(port);
655 unsigned long flags;
656 u8 control;
657 int ret;
658
659 spin_lock_irqsave(&priv->lock, flags);
660 if (set & TIOCM_RTS)
661 priv->line_control |= CONTROL_RTS;
662 if (set & TIOCM_DTR)
663 priv->line_control |= CONTROL_DTR;
664 if (clear & TIOCM_RTS)
665 priv->line_control &= ~CONTROL_RTS;
666 if (clear & TIOCM_DTR)
667 priv->line_control &= ~CONTROL_DTR;
668 control = priv->line_control;
669 spin_unlock_irqrestore(&priv->lock, flags);
670
671 ret = pl2303_set_control_lines(port, control);
672 if (ret)
673 return usb_translate_errors(ret);
674
675 return 0;
676 }
677
678 static int pl2303_tiocmget(struct tty_struct *tty)
679 {
680 struct usb_serial_port *port = tty->driver_data;
681 struct pl2303_private *priv = usb_get_serial_port_data(port);
682 unsigned long flags;
683 unsigned int mcr;
684 unsigned int status;
685 unsigned int result;
686
687 spin_lock_irqsave(&priv->lock, flags);
688 mcr = priv->line_control;
689 status = priv->line_status;
690 spin_unlock_irqrestore(&priv->lock, flags);
691
692 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
693 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
694 | ((status & UART_CTS) ? TIOCM_CTS : 0)
695 | ((status & UART_DSR) ? TIOCM_DSR : 0)
696 | ((status & UART_RING) ? TIOCM_RI : 0)
697 | ((status & UART_DCD) ? TIOCM_CD : 0);
698
699 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
700
701 return result;
702 }
703
704 static int pl2303_carrier_raised(struct usb_serial_port *port)
705 {
706 struct pl2303_private *priv = usb_get_serial_port_data(port);
707
708 if (priv->line_status & UART_DCD)
709 return 1;
710
711 return 0;
712 }
713
714 static int pl2303_ioctl(struct tty_struct *tty,
715 unsigned int cmd, unsigned long arg)
716 {
717 struct serial_struct ser;
718 struct usb_serial_port *port = tty->driver_data;
719
720 switch (cmd) {
721 case TIOCGSERIAL:
722 memset(&ser, 0, sizeof ser);
723 ser.type = PORT_16654;
724 ser.line = port->minor;
725 ser.port = port->port_number;
726 ser.baud_base = 460800;
727
728 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
729 return -EFAULT;
730
731 return 0;
732 default:
733 break;
734 }
735
736 return -ENOIOCTLCMD;
737 }
738
739 static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
740 {
741 struct usb_serial_port *port = tty->driver_data;
742 struct usb_serial *serial = port->serial;
743 u16 state;
744 int result;
745
746 if (break_state == 0)
747 state = BREAK_OFF;
748 else
749 state = BREAK_ON;
750
751 dev_dbg(&port->dev, "%s - turning break %s\n", __func__,
752 state == BREAK_OFF ? "off" : "on");
753
754 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
755 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
756 0, NULL, 0, 100);
757 if (result)
758 dev_err(&port->dev, "error sending break = %d\n", result);
759 }
760
761 static void pl2303_update_line_status(struct usb_serial_port *port,
762 unsigned char *data,
763 unsigned int actual_length)
764 {
765 struct usb_serial *serial = port->serial;
766 struct pl2303_serial_private *spriv = usb_get_serial_data(serial);
767 struct pl2303_private *priv = usb_get_serial_port_data(port);
768 struct tty_struct *tty;
769 unsigned long flags;
770 unsigned int status_idx = UART_STATE_INDEX;
771 u8 status;
772 u8 delta;
773
774 if (spriv->quirks & PL2303_QUIRK_UART_STATE_IDX0)
775 status_idx = 0;
776
777 if (actual_length < status_idx + 1)
778 return;
779
780 status = data[status_idx];
781
782 /* Save off the uart status for others to look at */
783 spin_lock_irqsave(&priv->lock, flags);
784 delta = priv->line_status ^ status;
785 priv->line_status = status;
786 spin_unlock_irqrestore(&priv->lock, flags);
787
788 if (status & UART_BREAK_ERROR)
789 usb_serial_handle_break(port);
790
791 if (delta & UART_STATE_MSR_MASK) {
792 if (delta & UART_CTS)
793 port->icount.cts++;
794 if (delta & UART_DSR)
795 port->icount.dsr++;
796 if (delta & UART_RING)
797 port->icount.rng++;
798 if (delta & UART_DCD) {
799 port->icount.dcd++;
800 tty = tty_port_tty_get(&port->port);
801 if (tty) {
802 usb_serial_handle_dcd_change(port, tty,
803 status & UART_DCD);
804 tty_kref_put(tty);
805 }
806 }
807
808 wake_up_interruptible(&port->port.delta_msr_wait);
809 }
810 }
811
812 static void pl2303_read_int_callback(struct urb *urb)
813 {
814 struct usb_serial_port *port = urb->context;
815 unsigned char *data = urb->transfer_buffer;
816 unsigned int actual_length = urb->actual_length;
817 int status = urb->status;
818 int retval;
819
820 switch (status) {
821 case 0:
822 /* success */
823 break;
824 case -ECONNRESET:
825 case -ENOENT:
826 case -ESHUTDOWN:
827 /* this urb is terminated, clean up */
828 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
829 __func__, status);
830 return;
831 default:
832 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
833 __func__, status);
834 goto exit;
835 }
836
837 usb_serial_debug_data(&port->dev, __func__,
838 urb->actual_length, urb->transfer_buffer);
839
840 pl2303_update_line_status(port, data, actual_length);
841
842 exit:
843 retval = usb_submit_urb(urb, GFP_ATOMIC);
844 if (retval) {
845 dev_err(&port->dev,
846 "%s - usb_submit_urb failed with result %d\n",
847 __func__, retval);
848 }
849 }
850
851 static void pl2303_process_read_urb(struct urb *urb)
852 {
853 struct usb_serial_port *port = urb->context;
854 struct pl2303_private *priv = usb_get_serial_port_data(port);
855 unsigned char *data = urb->transfer_buffer;
856 char tty_flag = TTY_NORMAL;
857 unsigned long flags;
858 u8 line_status;
859 int i;
860
861 /* update line status */
862 spin_lock_irqsave(&priv->lock, flags);
863 line_status = priv->line_status;
864 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
865 spin_unlock_irqrestore(&priv->lock, flags);
866
867 if (!urb->actual_length)
868 return;
869
870 /*
871 * Break takes precedence over parity, which takes precedence over
872 * framing errors.
873 */
874 if (line_status & UART_BREAK_ERROR)
875 tty_flag = TTY_BREAK;
876 else if (line_status & UART_PARITY_ERROR)
877 tty_flag = TTY_PARITY;
878 else if (line_status & UART_FRAME_ERROR)
879 tty_flag = TTY_FRAME;
880
881 if (tty_flag != TTY_NORMAL)
882 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__,
883 tty_flag);
884 /* overrun is special, not associated with a char */
885 if (line_status & UART_OVERRUN_ERROR)
886 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
887
888 if (port->port.console && port->sysrq) {
889 for (i = 0; i < urb->actual_length; ++i)
890 if (!usb_serial_handle_sysrq_char(port, data[i]))
891 tty_insert_flip_char(&port->port, data[i],
892 tty_flag);
893 } else {
894 tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag,
895 urb->actual_length);
896 }
897
898 tty_flip_buffer_push(&port->port);
899 }
900
901 static struct usb_serial_driver pl2303_device = {
902 .driver = {
903 .owner = THIS_MODULE,
904 .name = "pl2303",
905 },
906 .id_table = id_table,
907 .num_ports = 1,
908 .bulk_in_size = 256,
909 .bulk_out_size = 256,
910 .open = pl2303_open,
911 .close = pl2303_close,
912 .dtr_rts = pl2303_dtr_rts,
913 .carrier_raised = pl2303_carrier_raised,
914 .ioctl = pl2303_ioctl,
915 .break_ctl = pl2303_break_ctl,
916 .set_termios = pl2303_set_termios,
917 .tiocmget = pl2303_tiocmget,
918 .tiocmset = pl2303_tiocmset,
919 .tiocmiwait = usb_serial_generic_tiocmiwait,
920 .process_read_urb = pl2303_process_read_urb,
921 .read_int_callback = pl2303_read_int_callback,
922 .probe = pl2303_probe,
923 .attach = pl2303_startup,
924 .release = pl2303_release,
925 .port_probe = pl2303_port_probe,
926 .port_remove = pl2303_port_remove,
927 };
928
929 static struct usb_serial_driver * const serial_drivers[] = {
930 &pl2303_device, NULL
931 };
932
933 module_usb_serial_driver(serial_drivers, id_table);
934
935 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
936 MODULE_LICENSE("GPL");
Linux with added FPC-III support