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Linux 4.2.1
[linux/fpc-iii.git] / drivers / usb / serial / pl2303.c
blobae682e4eeaef575a23c90a8dda15407e862d42e1
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(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
98 MODULE_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
134 static void pl2303_set_break(struct usb_serial_port *port, bool enable);
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 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
401 static 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
432 static 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
455 static 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
478 static 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
614 static 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
631 static 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
638 static 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
673 static 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
701 static 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
727 static 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
737 static 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
762 static 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
783 static 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
790 static 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
841 static 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
871 exit:
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
880 static 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
930 static 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
958 static struct usb_serial_driver * const serial_drivers[] = {
959 &pl2303_device, NULL
960 };
961
962 module_usb_serial_driver(serial_drivers, id_table);
963
964 MODULE_DESCRIPTION("Prolific PL2303 USB to serial adaptor driver");
965 MODULE_LICENSE("GPL");
Linux with added FPC-III support