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USB: pl2303: remove bogus checks and fix speed support to use tty_get_baud_rate()
[linux-2.6-block.git] / drivers / usb / serial / pl2303.c
CommitLineData
1da177e4
LT		 1/*
2 * Prolific PL2303 USB to serial adaptor driver
3 *
4d0dce3e 4 * Copyright (C) 2001-2007 Greg Kroah-Hartman (greg@kroah.com)
1da177e4
LT		 5 * Copyright (C) 2003 IBM Corp.
6 *
7 * Original driver for 2.2.x by anonymous
8 *
4d0dce3e
GKH		 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.
1da177e4
LT		 12 *
13 * See Documentation/usb/usb-serial.txt for more information on using this driver
14 *
1da177e4
LT		 15 */
16
1da177e4
LT		 17#include <linux/kernel.h>
18#include <linux/errno.h>
19#include <linux/init.h>
20#include <linux/slab.h>
21#include <linux/tty.h>
22#include <linux/tty_driver.h>
23#include <linux/tty_flip.h>
24#include <linux/serial.h>
25#include <linux/module.h>
26#include <linux/moduleparam.h>
27#include <linux/spinlock.h>
28#include <asm/uaccess.h>
29#include <linux/usb.h>
a969888c 30#include <linux/usb/serial.h>
1da177e4
LT		 31#include "pl2303.h"
32
33/*
34 * Version Information
35 */
1da177e4
LT		 36#define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
37
38static int debug;
39
40#define PL2303_CLOSING_WAIT (30*HZ)
41
42#define PL2303_BUF_SIZE 1024
43#define PL2303_TMP_BUF_SIZE 1024
44
1da177e4
LT		 45struct pl2303_buf {
46 unsigned int buf_size;
47 char *buf_buf;
48 char *buf_get;
49 char *buf_put;
50};
51
52static struct usb_device_id id_table [] = {
53 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
54 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
3d861494 55 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
1da177e4
LT		 56 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
57 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
58 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
59 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
60 { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
61 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
62 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
63 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
58381719 64 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
1da177e4
LT		 65 { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
66 { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
67 { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
68 { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
69 { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
70 { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
71 { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
72 { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
a8310f3b 73 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
1da177e4 74 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
a8310f3b 75 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
acbb36f1 76 { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
c6c27721
CL		 77 { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
78 { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
6cceb05f 79 { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
c6c27721 80 { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
491b04ce 81 { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
3b928474 82 { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
b7aa94b6 83 { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
8fd80133 84 { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
b697f70f 85 { USB_DEVICE(HUAWEI_VENDOR_ID, HUAWEI_PRODUCT_ID) },
2d94b981 86 { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
1da177e4
LT		 87 { } /* Terminating entry */
88};
89
372db8a7 90MODULE_DEVICE_TABLE(usb, id_table);
1da177e4
LT		 91
92static struct usb_driver pl2303_driver = {
1da177e4
LT		 93 .name = "pl2303",
94 .probe = usb_serial_probe,
95 .disconnect = usb_serial_disconnect,
96 .id_table = id_table,
ba9dc657 97 .no_dynamic_id = 1,
1da177e4
LT		 98};
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 0x08
123#define UART_STATE_TRANSIENT_MASK 0x74
124#define UART_DCD 0x01
125#define UART_DSR 0x02
126#define UART_BREAK_ERROR 0x04
127#define UART_RING 0x08
128#define UART_FRAME_ERROR 0x10
129#define UART_PARITY_ERROR 0x20
130#define UART_OVERRUN_ERROR 0x40
131#define UART_CTS 0x80
132
1da177e4
LT		 133
134enum pl2303_type {
135 type_0, /* don't know the difference between type 0 and */
136 type_1, /* type 1, until someone from prolific tells us... */
137 HX, /* HX version of the pl2303 chip */
138};
139
140struct pl2303_private {
141 spinlock_t lock;
142 struct pl2303_buf *buf;
143 int write_urb_in_use;
144 wait_queue_head_t delta_msr_wait;
145 u8 line_control;
146 u8 line_status;
147 u8 termios_initialized;
148 enum pl2303_type type;
149};
150
572d3138
TG		 151/*
152 * pl2303_buf_alloc
153 *
154 * Allocate a circular buffer and all associated memory.
155 */
156static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
157{
158 struct pl2303_buf *pb;
159
160 if (size == 0)
161 return NULL;
162
5cbded58 163 pb = kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
572d3138
TG		 164 if (pb == NULL)
165 return NULL;
166
167 pb->buf_buf = kmalloc(size, GFP_KERNEL);
168 if (pb->buf_buf == NULL) {
169 kfree(pb);
170 return NULL;
171 }
172
173 pb->buf_size = size;
174 pb->buf_get = pb->buf_put = pb->buf_buf;
175
176 return pb;
177}
178
179/*
180 * pl2303_buf_free
181 *
182 * Free the buffer and all associated memory.
183 */
184static void pl2303_buf_free(struct pl2303_buf *pb)
185{
186 if (pb) {
187 kfree(pb->buf_buf);
188 kfree(pb);
189 }
190}
191
192/*
193 * pl2303_buf_clear
194 *
195 * Clear out all data in the circular buffer.
196 */
197static void pl2303_buf_clear(struct pl2303_buf *pb)
198{
199 if (pb != NULL)
200 pb->buf_get = pb->buf_put;
201 /* equivalent to a get of all data available */
202}
203
204/*
205 * pl2303_buf_data_avail
206 *
207 * Return the number of bytes of data available in the circular
208 * buffer.
209 */
210static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
211{
212 if (pb == NULL)
213 return 0;
214
215 return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
216}
217
218/*
219 * pl2303_buf_space_avail
220 *
221 * Return the number of bytes of space available in the circular
222 * buffer.
223 */
224static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
225{
226 if (pb == NULL)
227 return 0;
228
229 return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
230}
231
232/*
233 * pl2303_buf_put
234 *
235 * Copy data data from a user buffer and put it into the circular buffer.
236 * Restrict to the amount of space available.
237 *
238 * Return the number of bytes copied.
239 */
240static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
241 unsigned int count)
242{
243 unsigned int len;
244
245 if (pb == NULL)
246 return 0;
247
248 len = pl2303_buf_space_avail(pb);
249 if (count > len)
250 count = len;
251
252 if (count == 0)
253 return 0;
254
255 len = pb->buf_buf + pb->buf_size - pb->buf_put;
256 if (count > len) {
257 memcpy(pb->buf_put, buf, len);
258 memcpy(pb->buf_buf, buf+len, count - len);
259 pb->buf_put = pb->buf_buf + count - len;
260 } else {
261 memcpy(pb->buf_put, buf, count);
262 if (count < len)
263 pb->buf_put += count;
264 else /* count == len */
265 pb->buf_put = pb->buf_buf;
266 }
267
268 return count;
269}
270
271/*
272 * pl2303_buf_get
273 *
274 * Get data from the circular buffer and copy to the given buffer.
275 * Restrict to the amount of data available.
276 *
277 * Return the number of bytes copied.
278 */
279static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
280 unsigned int count)
281{
282 unsigned int len;
283
284 if (pb == NULL)
285 return 0;
286
287 len = pl2303_buf_data_avail(pb);
288 if (count > len)
289 count = len;
290
291 if (count == 0)
292 return 0;
293
294 len = pb->buf_buf + pb->buf_size - pb->buf_get;
295 if (count > len) {
296 memcpy(buf, pb->buf_get, len);
297 memcpy(buf+len, pb->buf_buf, count - len);
298 pb->buf_get = pb->buf_buf + count - len;
299 } else {
300 memcpy(buf, pb->buf_get, count);
301 if (count < len)
302 pb->buf_get += count;
303 else /* count == len */
304 pb->buf_get = pb->buf_buf;
305 }
306
307 return count;
308}
1da177e4 309
372db8a7 310static int pl2303_startup(struct usb_serial *serial)
1da177e4
LT		 311{
312 struct pl2303_private *priv;
313 enum pl2303_type type = type_0;
314 int i;
315
316 if (serial->dev->descriptor.bDeviceClass == 0x02)
317 type = type_0;
318 else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
319 type = HX;
320 else if (serial->dev->descriptor.bDeviceClass == 0x00)
321 type = type_1;
322 else if (serial->dev->descriptor.bDeviceClass == 0xFF)
323 type = type_1;
324 dbg("device type: %d", type);
325
326 for (i = 0; i < serial->num_ports; ++i) {
80b6ca48 327 priv = kzalloc(sizeof(struct pl2303_private), GFP_KERNEL);
1da177e4
LT		 328 if (!priv)
329 goto cleanup;
1da177e4
LT		 330 spin_lock_init(&priv->lock);
331 priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
332 if (priv->buf == NULL) {
333 kfree(priv);
334 goto cleanup;
335 }
336 init_waitqueue_head(&priv->delta_msr_wait);
337 priv->type = type;
338 usb_set_serial_port_data(serial->port[i], priv);
339 }
340 return 0;
341
342cleanup:
343 for (--i; i>=0; --i) {
344 priv = usb_get_serial_port_data(serial->port[i]);
345 pl2303_buf_free(priv->buf);
346 kfree(priv);
347 usb_set_serial_port_data(serial->port[i], NULL);
348 }
349 return -ENOMEM;
350}
351
372db8a7 352static int set_control_lines(struct usb_device *dev, u8 value)
1da177e4
LT		 353{
354 int retval;
355
372db8a7
TG		 356 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
357 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
358 value, 0, NULL, 0, 100);
1da177e4
LT		 359 dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
360 return retval;
361}
362
1da177e4
LT		 363static void pl2303_send(struct usb_serial_port *port)
364{
365 int count, result;
366 struct pl2303_private *priv = usb_get_serial_port_data(port);
367 unsigned long flags;
368
369 dbg("%s - port %d", __FUNCTION__, port->number);
370
371 spin_lock_irqsave(&priv->lock, flags);
372
373 if (priv->write_urb_in_use) {
374 spin_unlock_irqrestore(&priv->lock, flags);
375 return;
376 }
377
378 count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
372db8a7 379 port->bulk_out_size);
1da177e4
LT		 380
381 if (count == 0) {
382 spin_unlock_irqrestore(&priv->lock, flags);
383 return;
384 }
385
386 priv->write_urb_in_use = 1;
387
388 spin_unlock_irqrestore(&priv->lock, flags);
389
372db8a7
TG		 390 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count,
391 port->write_urb->transfer_buffer);
1da177e4
LT		 392
393 port->write_urb->transfer_buffer_length = count;
394 port->write_urb->dev = port->serial->dev;
372db8a7 395 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1da177e4 396 if (result) {
372db8a7
TG		 397 dev_err(&port->dev, "%s - failed submitting write urb,"
398 " error %d\n", __FUNCTION__, result);
1da177e4
LT		 399 priv->write_urb_in_use = 0;
400 // TODO: reschedule pl2303_send
401 }
402
cf2c7481 403 usb_serial_port_softint(port);
1da177e4
LT		 404}
405
572d3138
TG		 406static int pl2303_write(struct usb_serial_port *port, const unsigned char *buf,
407 int count)
408{
409 struct pl2303_private *priv = usb_get_serial_port_data(port);
410 unsigned long flags;
411
412 dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
413
414 if (!count)
415 return count;
416
417 spin_lock_irqsave(&priv->lock, flags);
418 count = pl2303_buf_put(priv->buf, buf, count);
419 spin_unlock_irqrestore(&priv->lock, flags);
420
421 pl2303_send(port);
422
423 return count;
424}
425
1da177e4
LT		 426static int pl2303_write_room(struct usb_serial_port *port)
427{
428 struct pl2303_private *priv = usb_get_serial_port_data(port);
429 int room = 0;
430 unsigned long flags;
431
432 dbg("%s - port %d", __FUNCTION__, port->number);
433
434 spin_lock_irqsave(&priv->lock, flags);
435 room = pl2303_buf_space_avail(priv->buf);
436 spin_unlock_irqrestore(&priv->lock, flags);
437
438 dbg("%s - returns %d", __FUNCTION__, room);
439 return room;
440}
441
442static int pl2303_chars_in_buffer(struct usb_serial_port *port)
443{
444 struct pl2303_private *priv = usb_get_serial_port_data(port);
445 int chars = 0;
446 unsigned long flags;
447
448 dbg("%s - port %d", __FUNCTION__, port->number);
449
450 spin_lock_irqsave(&priv->lock, flags);
451 chars = pl2303_buf_data_avail(priv->buf);
452 spin_unlock_irqrestore(&priv->lock, flags);
453
454 dbg("%s - returns %d", __FUNCTION__, chars);
455 return chars;
456}
457
372db8a7 458static void pl2303_set_termios(struct usb_serial_port *port,
606d099c 459 struct ktermios *old_termios)
1da177e4
LT		 460{
461 struct usb_serial *serial = port->serial;
462 struct pl2303_private *priv = usb_get_serial_port_data(port);
463 unsigned long flags;
464 unsigned int cflag;
465 unsigned char *buf;
466 int baud;
467 int i;
468 u8 control;
469
470 dbg("%s - port %d", __FUNCTION__, port->number);
471
472 if ((!port->tty) || (!port->tty->termios)) {
473 dbg("%s - no tty structures", __FUNCTION__);
474 return;
475 }
476
477 spin_lock_irqsave(&priv->lock, flags);
478 if (!priv->termios_initialized) {
479 *(port->tty->termios) = tty_std_termios;
372db8a7
TG		 480 port->tty->termios->c_cflag = B9600 | CS8 | CREAD |
481 HUPCL | CLOCAL;
1da177e4
LT		 482 priv->termios_initialized = 1;
483 }
484 spin_unlock_irqrestore(&priv->lock, flags);
485
486 cflag = port->tty->termios->c_cflag;
1da177e4 487
372db8a7 488 buf = kzalloc(7, GFP_KERNEL);
1da177e4
LT		 489 if (!buf) {
490 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
491 return;
492 }
1da177e4 493
372db8a7
TG		 494 i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
495 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
496 0, 0, buf, 7, 100);
497 dbg("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i,
498 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
1da177e4
LT		 499
500 if (cflag & CSIZE) {
501 switch (cflag & CSIZE) {
502 case CS5: buf[6] = 5; break;
503 case CS6: buf[6] = 6; break;
504 case CS7: buf[6] = 7; break;
505 default:
506 case CS8: buf[6] = 8; break;
507 }
508 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
509 }
510
e0c79f51 511 baud = tty_get_baud_rate(port->tty);;
1da177e4
LT		 512 dbg("%s - baud = %d", __FUNCTION__, baud);
513 if (baud) {
514 buf[0] = baud & 0xff;
515 buf[1] = (baud >> 8) & 0xff;
516 buf[2] = (baud >> 16) & 0xff;
517 buf[3] = (baud >> 24) & 0xff;
518 }
519
520 /* For reference buf[4]=0 is 1 stop bits */
521 /* For reference buf[4]=1 is 1.5 stop bits */
522 /* For reference buf[4]=2 is 2 stop bits */
523 if (cflag & CSTOPB) {
524 buf[4] = 2;
525 dbg("%s - stop bits = 2", __FUNCTION__);
526 } else {
527 buf[4] = 0;
528 dbg("%s - stop bits = 1", __FUNCTION__);
529 }
530
531 if (cflag & PARENB) {
532 /* For reference buf[5]=0 is none parity */
533 /* For reference buf[5]=1 is odd parity */
534 /* For reference buf[5]=2 is even parity */
535 /* For reference buf[5]=3 is mark parity */
536 /* For reference buf[5]=4 is space parity */
537 if (cflag & PARODD) {
538 buf[5] = 1;
539 dbg("%s - parity = odd", __FUNCTION__);
540 } else {
541 buf[5] = 2;
542 dbg("%s - parity = even", __FUNCTION__);
543 }
544 } else {
545 buf[5] = 0;
546 dbg("%s - parity = none", __FUNCTION__);
547 }
548
372db8a7
TG		 549 i = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
550 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
551 0, 0, buf, 7, 100);
552 dbg("0x21:0x20:0:0 %d", i);
1da177e4
LT		 553
554 /* change control lines if we are switching to or from B0 */
555 spin_lock_irqsave(&priv->lock, flags);
556 control = priv->line_control;
557 if ((cflag & CBAUD) == B0)
558 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
559 else
560 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
561 if (control != priv->line_control) {
562 control = priv->line_control;
563 spin_unlock_irqrestore(&priv->lock, flags);
564 set_control_lines(serial->dev, control);
565 } else {
566 spin_unlock_irqrestore(&priv->lock, flags);
567 }
372db8a7 568
1da177e4
LT		 569 buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
570
372db8a7
TG		 571 i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
572 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
573 0, 0, buf, 7, 100);
574 dbg("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i,
1da177e4
LT		 575 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
576
577 if (cflag & CRTSCTS) {
578 __u16 index;
579 if (priv->type == HX)
580 index = 0x61;
581 else
582 index = 0x41;
372db8a7 583 i = usb_control_msg(serial->dev,
1da177e4
LT		 584 usb_sndctrlpipe(serial->dev, 0),
585 VENDOR_WRITE_REQUEST,
586 VENDOR_WRITE_REQUEST_TYPE,
587 0x0, index, NULL, 0, 100);
372db8a7 588 dbg("0x40:0x1:0x0:0x%x %d", index, i);
715f9527 589 } else {
590 i = usb_control_msg(serial->dev,
591 usb_sndctrlpipe(serial->dev, 0),
592 VENDOR_WRITE_REQUEST,
593 VENDOR_WRITE_REQUEST_TYPE,
594 0x0, 0x0, NULL, 0, 100);
595 dbg ("0x40:0x1:0x0:0x0 %d", i);
1da177e4 596 }
572d3138
TG		 597
598 kfree(buf);
599}
600
601static void pl2303_close(struct usb_serial_port *port, struct file *filp)
602{
603 struct pl2303_private *priv = usb_get_serial_port_data(port);
604 unsigned long flags;
605 unsigned int c_cflag;
606 int bps;
607 long timeout;
608 wait_queue_t wait;
609
610 dbg("%s - port %d", __FUNCTION__, port->number);
611
612 /* wait for data to drain from the buffer */
613 spin_lock_irqsave(&priv->lock, flags);
614 timeout = PL2303_CLOSING_WAIT;
615 init_waitqueue_entry(&wait, current);
616 add_wait_queue(&port->tty->write_wait, &wait);
617 for (;;) {
618 set_current_state(TASK_INTERRUPTIBLE);
619 if (pl2303_buf_data_avail(priv->buf) == 0 ||
620 timeout == 0 || signal_pending(current) ||
621 !usb_get_intfdata(port->serial->interface)) /* disconnect */
622 break;
623 spin_unlock_irqrestore(&priv->lock, flags);
624 timeout = schedule_timeout(timeout);
625 spin_lock_irqsave(&priv->lock, flags);
626 }
627 set_current_state(TASK_RUNNING);
628 remove_wait_queue(&port->tty->write_wait, &wait);
629 /* clear out any remaining data in the buffer */
630 pl2303_buf_clear(priv->buf);
631 spin_unlock_irqrestore(&priv->lock, flags);
632
633 /* wait for characters to drain from the device */
634 /* (this is long enough for the entire 256 byte */
635 /* pl2303 hardware buffer to drain with no flow */
636 /* control for data rates of 1200 bps or more, */
637 /* for lower rates we should really know how much */
638 /* data is in the buffer to compute a delay */
639 /* that is not unnecessarily long) */
640 bps = tty_get_baud_rate(port->tty);
641 if (bps > 1200)
642 timeout = max((HZ*2560)/bps,HZ/10);
643 else
644 timeout = 2*HZ;
645 schedule_timeout_interruptible(timeout);
646
647 /* shutdown our urbs */
648 dbg("%s - shutting down urbs", __FUNCTION__);
649 usb_kill_urb(port->write_urb);
650 usb_kill_urb(port->read_urb);
651 usb_kill_urb(port->interrupt_in_urb);
652
653 if (port->tty) {
654 c_cflag = port->tty->termios->c_cflag;
655 if (c_cflag & HUPCL) {
656 /* drop DTR and RTS */
657 spin_lock_irqsave(&priv->lock, flags);
658 priv->line_control = 0;
659 spin_unlock_irqrestore(&priv->lock, flags);
660 set_control_lines(port->serial->dev, 0);
661 }
662 }
1da177e4
LT		 663}
664
372db8a7 665static int pl2303_open(struct usb_serial_port *port, struct file *filp)
1da177e4 666{
606d099c 667 struct ktermios tmp_termios;
1da177e4
LT		 668 struct usb_serial *serial = port->serial;
669 struct pl2303_private *priv = usb_get_serial_port_data(port);
670 unsigned char *buf;
671 int result;
672
673 dbg("%s - port %d", __FUNCTION__, port->number);
674
1694899f
D		 675 if (priv->type != HX) {
676 usb_clear_halt(serial->dev, port->write_urb->pipe);
677 usb_clear_halt(serial->dev, port->read_urb->pipe);
678 }
1da177e4
LT		 679
680 buf = kmalloc(10, GFP_KERNEL);
681 if (buf==NULL)
682 return -ENOMEM;
683
684#define FISH(a,b,c,d) \
685 result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0), \
686 b, a, c, d, buf, 1, 100); \
687 dbg("0x%x:0x%x:0x%x:0x%x %d - %x",a,b,c,d,result,buf[0]);
688
689#define SOUP(a,b,c,d) \
690 result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0), \
691 b, a, c, d, NULL, 0, 100); \
692 dbg("0x%x:0x%x:0x%x:0x%x %d",a,b,c,d,result);
693
694 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
695 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
696 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
697 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
698 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
699 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
700 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
701 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
702 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
703 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
704
705 if (priv->type == HX) {
706 /* HX chip */
707 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
708 /* reset upstream data pipes */
709 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
710 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
711 } else {
712 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
713 }
714
715 kfree(buf);
716
717 /* Setup termios */
718 if (port->tty) {
372db8a7 719 pl2303_set_termios(port, &tmp_termios);
1da177e4
LT		 720 }
721
722 //FIXME: need to assert RTS and DTR if CRTSCTS off
723
724 dbg("%s - submitting read urb", __FUNCTION__);
725 port->read_urb->dev = serial->dev;
372db8a7 726 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
1da177e4 727 if (result) {
372db8a7
TG		 728 dev_err(&port->dev, "%s - failed submitting read urb,"
729 " error %d\n", __FUNCTION__, result);
730 pl2303_close(port, NULL);
1da177e4
LT		 731 return -EPROTO;
732 }
733
734 dbg("%s - submitting interrupt urb", __FUNCTION__);
735 port->interrupt_in_urb->dev = serial->dev;
372db8a7 736 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1da177e4 737 if (result) {
372db8a7
TG		 738 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
739 " error %d\n", __FUNCTION__, result);
740 pl2303_close(port, NULL);
1da177e4
LT		 741 return -EPROTO;
742 }
743 return 0;
744}
745
372db8a7
TG		 746static int pl2303_tiocmset(struct usb_serial_port *port, struct file *file,
747 unsigned int set, unsigned int clear)
1da177e4
LT		 748{
749 struct pl2303_private *priv = usb_get_serial_port_data(port);
750 unsigned long flags;
751 u8 control;
752
6fdd8e8e
FL		 753 if (!usb_get_intfdata(port->serial->interface))
754 return -ENODEV;
755
372db8a7 756 spin_lock_irqsave(&priv->lock, flags);
1da177e4
LT		 757 if (set & TIOCM_RTS)
758 priv->line_control |= CONTROL_RTS;
759 if (set & TIOCM_DTR)
760 priv->line_control |= CONTROL_DTR;
761 if (clear & TIOCM_RTS)
762 priv->line_control &= ~CONTROL_RTS;
763 if (clear & TIOCM_DTR)
764 priv->line_control &= ~CONTROL_DTR;
765 control = priv->line_control;
372db8a7 766 spin_unlock_irqrestore(&priv->lock, flags);
1da177e4 767
372db8a7 768 return set_control_lines(port->serial->dev, control);
1da177e4
LT		 769}
770
372db8a7 771static int pl2303_tiocmget(struct usb_serial_port *port, struct file *file)
1da177e4
LT		 772{
773 struct pl2303_private *priv = usb_get_serial_port_data(port);
774 unsigned long flags;
775 unsigned int mcr;
776 unsigned int status;
777 unsigned int result;
778
779 dbg("%s (%d)", __FUNCTION__, port->number);
780
6fdd8e8e
FL		 781 if (!usb_get_intfdata(port->serial->interface))
782 return -ENODEV;
783
372db8a7 784 spin_lock_irqsave(&priv->lock, flags);
1da177e4
LT		 785 mcr = priv->line_control;
786 status = priv->line_status;
372db8a7 787 spin_unlock_irqrestore(&priv->lock, flags);
1da177e4
LT		 788
789 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
790 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
791 | ((status & UART_CTS) ? TIOCM_CTS : 0)
792 | ((status & UART_DSR) ? TIOCM_DSR : 0)
793 | ((status & UART_RING) ? TIOCM_RI : 0)
794 | ((status & UART_DCD) ? TIOCM_CD : 0);
795
796 dbg("%s - result = %x", __FUNCTION__, result);
797
798 return result;
799}
800
801static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
802{
803 struct pl2303_private *priv = usb_get_serial_port_data(port);
804 unsigned long flags;
805 unsigned int prevstatus;
806 unsigned int status;
807 unsigned int changed;
808
372db8a7 809 spin_lock_irqsave(&priv->lock, flags);
1da177e4 810 prevstatus = priv->line_status;
372db8a7 811 spin_unlock_irqrestore(&priv->lock, flags);
1da177e4
LT		 812
813 while (1) {
814 interruptible_sleep_on(&priv->delta_msr_wait);
815 /* see if a signal did it */
816 if (signal_pending(current))
817 return -ERESTARTSYS;
372db8a7
TG		 818
819 spin_lock_irqsave(&priv->lock, flags);
1da177e4 820 status = priv->line_status;
372db8a7
TG		 821 spin_unlock_irqrestore(&priv->lock, flags);
822
1da177e4 823 changed=prevstatus^status;
372db8a7 824
1da177e4
LT		 825 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
826 ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
827 ((arg & TIOCM_CD) && (changed & UART_DCD)) ||
828 ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
829 return 0;
830 }
831 prevstatus = status;
832 }
833 /* NOTREACHED */
834 return 0;
835}
836
372db8a7
TG		 837static int pl2303_ioctl(struct usb_serial_port *port, struct file *file,
838 unsigned int cmd, unsigned long arg)
1da177e4
LT		 839{
840 dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
841
842 switch (cmd) {
843 case TIOCMIWAIT:
844 dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
845 return wait_modem_info(port, arg);
846
847 default:
848 dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
849 break;
850 }
851
852 return -ENOIOCTLCMD;
853}
854
372db8a7 855static void pl2303_break_ctl(struct usb_serial_port *port, int break_state)
1da177e4
LT		 856{
857 struct usb_serial *serial = port->serial;
858 u16 state;
859 int result;
860
861 dbg("%s - port %d", __FUNCTION__, port->number);
862
863 if (break_state == 0)
864 state = BREAK_OFF;
865 else
866 state = BREAK_ON;
867 dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
868
372db8a7
TG		 869 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
870 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
871 0, NULL, 0, 100);
1da177e4
LT		 872 if (result)
873 dbg("%s - error sending break = %d", __FUNCTION__, result);
874}
875
372db8a7 876static void pl2303_shutdown(struct usb_serial *serial)
1da177e4
LT		 877{
878 int i;
879 struct pl2303_private *priv;
880
881 dbg("%s", __FUNCTION__);
882
883 for (i = 0; i < serial->num_ports; ++i) {
884 priv = usb_get_serial_port_data(serial->port[i]);
885 if (priv) {
886 pl2303_buf_free(priv->buf);
887 kfree(priv);
888 usb_set_serial_port_data(serial->port[i], NULL);
889 }
372db8a7 890 }
1da177e4
LT		 891}
892
97bb13ec
FL		 893static void pl2303_update_line_status(struct usb_serial_port *port,
894 unsigned char *data,
895 unsigned int actual_length)
896{
897
898 struct pl2303_private *priv = usb_get_serial_port_data(port);
899 unsigned long flags;
900 u8 status_idx = UART_STATE;
95f209f9 901 u8 length = UART_STATE + 1;
9c537616 902 u16 idv, idp;
97bb13ec 903
9c537616
TG		 904 idv = le16_to_cpu(port->serial->dev->descriptor.idVendor);
905 idp = le16_to_cpu(port->serial->dev->descriptor.idProduct);
906
907
908 if (idv == SIEMENS_VENDOR_ID) {
909 if (idp == SIEMENS_PRODUCT_ID_X65 ||
910 idp == SIEMENS_PRODUCT_ID_SX1 ||
911 idp == SIEMENS_PRODUCT_ID_X75) {
912
913 length = 1;
914 status_idx = 0;
915 }
97bb13ec
FL		 916 }
917
918 if (actual_length < length)
a009b75a 919 return;
97bb13ec
FL		 920
921 /* Save off the uart status for others to look at */
922 spin_lock_irqsave(&priv->lock, flags);
923 priv->line_status = data[status_idx];
924 spin_unlock_irqrestore(&priv->lock, flags);
372db8a7 925 wake_up_interruptible(&priv->delta_msr_wait);
97bb13ec 926}
1da177e4 927
7d12e780 928static void pl2303_read_int_callback(struct urb *urb)
1da177e4
LT		 929{
930 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
1da177e4 931 unsigned char *data = urb->transfer_buffer;
97bb13ec 932 unsigned int actual_length = urb->actual_length;
461d696a
GKH		 933 int status = urb->status;
934 int retval;
1da177e4
LT		 935
936 dbg("%s (%d)", __FUNCTION__, port->number);
937
461d696a 938 switch (status) {
1da177e4
LT		 939 case 0:
940 /* success */
941 break;
942 case -ECONNRESET:
943 case -ENOENT:
944 case -ESHUTDOWN:
945 /* this urb is terminated, clean up */
372db8a7 946 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
461d696a 947 status);
1da177e4
LT		 948 return;
949 default:
372db8a7 950 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
461d696a 951 status);
1da177e4
LT		 952 goto exit;
953 }
954
372db8a7
TG		 955 usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
956 urb->actual_length, urb->transfer_buffer);
957
97bb13ec 958 pl2303_update_line_status(port, data, actual_length);
1da177e4 959
1da177e4 960exit:
461d696a
GKH		 961 retval = usb_submit_urb(urb, GFP_ATOMIC);
962 if (retval)
372db8a7
TG		 963 dev_err(&urb->dev->dev,
964 "%s - usb_submit_urb failed with result %d\n",
461d696a 965 __FUNCTION__, retval);
1da177e4
LT		 966}
967
7d12e780 968static void pl2303_read_bulk_callback(struct urb *urb)
1da177e4
LT		 969{
970 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
971 struct pl2303_private *priv = usb_get_serial_port_data(port);
972 struct tty_struct *tty;
973 unsigned char *data = urb->transfer_buffer;
974 unsigned long flags;
975 int i;
976 int result;
461d696a
GKH		 977 int status = urb->status;
978 u8 line_status;
1da177e4
LT		 979 char tty_flag;
980
981 dbg("%s - port %d", __FUNCTION__, port->number);
982
461d696a
GKH		 983 if (status) {
984 dbg("%s - urb status = %d", __FUNCTION__, status);
1da177e4
LT		 985 if (!port->open_count) {
986 dbg("%s - port is closed, exiting.", __FUNCTION__);
987 return;
988 }
461d696a 989 if (status == -EPROTO) {
372db8a7
TG		 990 /* PL2303 mysteriously fails with -EPROTO reschedule
991 * the read */
992 dbg("%s - caught -EPROTO, resubmitting the urb",
993 __FUNCTION__);
1da177e4
LT		 994 urb->dev = port->serial->dev;
995 result = usb_submit_urb(urb, GFP_ATOMIC);
996 if (result)
372db8a7
TG		 997 dev_err(&urb->dev->dev, "%s - failed"
998 " resubmitting read urb, error %d\n",
999 __FUNCTION__, result);
1da177e4
LT		 1000 return;
1001 }
1002 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
1003 return;
1004 }
1005
372db8a7
TG		 1006 usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
1007 urb->actual_length, data);
1da177e4
LT		 1008
1009 /* get tty_flag from status */
1010 tty_flag = TTY_NORMAL;
1011
1012 spin_lock_irqsave(&priv->lock, flags);
461d696a 1013 line_status = priv->line_status;
1da177e4
LT		 1014 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
1015 spin_unlock_irqrestore(&priv->lock, flags);
372db8a7 1016 wake_up_interruptible(&priv->delta_msr_wait);
1da177e4
LT		 1017
1018 /* break takes precedence over parity, */
1019 /* which takes precedence over framing errors */
461d696a 1020 if (line_status & UART_BREAK_ERROR )
1da177e4 1021 tty_flag = TTY_BREAK;
461d696a 1022 else if (line_status & UART_PARITY_ERROR)
1da177e4 1023 tty_flag = TTY_PARITY;
461d696a 1024 else if (line_status & UART_FRAME_ERROR)
1da177e4
LT		 1025 tty_flag = TTY_FRAME;
1026 dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
1027
1028 tty = port->tty;
1029 if (tty && urb->actual_length) {
33f0f88f 1030 tty_buffer_request_room(tty, urb->actual_length + 1);
1da177e4 1031 /* overrun is special, not associated with a char */
461d696a 1032 if (line_status & UART_OVERRUN_ERROR)
1da177e4 1033 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
33f0f88f 1034 for (i = 0; i < urb->actual_length; ++i)
372db8a7
TG		 1035 tty_insert_flip_char(tty, data[i], tty_flag);
1036 tty_flip_buffer_push(tty);
1da177e4
LT		 1037 }
1038
1039 /* Schedule the next read _if_ we are still open */
1040 if (port->open_count) {
1041 urb->dev = port->serial->dev;
1042 result = usb_submit_urb(urb, GFP_ATOMIC);
1043 if (result)
372db8a7
TG		 1044 dev_err(&urb->dev->dev, "%s - failed resubmitting"
1045 " read urb, error %d\n", __FUNCTION__, result);
1da177e4
LT		 1046 }
1047
1048 return;
1049}
1050
7d12e780 1051static void pl2303_write_bulk_callback(struct urb *urb)
1da177e4
LT		 1052{
1053 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
1054 struct pl2303_private *priv = usb_get_serial_port_data(port);
1055 int result;
461d696a 1056 int status = urb->status;
1da177e4
LT		 1057
1058 dbg("%s - port %d", __FUNCTION__, port->number);
1059
461d696a 1060 switch (status) {
1da177e4
LT		 1061 case 0:
1062 /* success */
1063 break;
1064 case -ECONNRESET:
1065 case -ENOENT:
1066 case -ESHUTDOWN:
1067 /* this urb is terminated, clean up */
372db8a7 1068 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
461d696a 1069 status);
1da177e4
LT		 1070 priv->write_urb_in_use = 0;
1071 return;
1072 default:
1073 /* error in the urb, so we have to resubmit it */
1074 dbg("%s - Overflow in write", __FUNCTION__);
372db8a7 1075 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__,
461d696a 1076 status);
1da177e4
LT		 1077 port->write_urb->transfer_buffer_length = 1;
1078 port->write_urb->dev = port->serial->dev;
372db8a7 1079 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1da177e4 1080 if (result)
372db8a7
TG		 1081 dev_err(&urb->dev->dev, "%s - failed resubmitting write"
1082 " urb, error %d\n", __FUNCTION__, result);
1da177e4
LT		 1083 else
1084 return;
1085 }
1086
1087 priv->write_urb_in_use = 0;
1088
1089 /* send any buffered data */
1090 pl2303_send(port);
1091}
1092
572d3138
TG		 1093/* All of the device info needed for the PL2303 SIO serial converter */
1094static struct usb_serial_driver pl2303_device = {
1095 .driver = {
1096 .owner = THIS_MODULE,
1097 .name = "pl2303",
1098 },
1099 .id_table = id_table,
d9b1b787 1100 .usb_driver = &pl2303_driver,
572d3138
TG		 1101 .num_interrupt_in = NUM_DONT_CARE,
1102 .num_bulk_in = 1,
1103 .num_bulk_out = 1,
1104 .num_ports = 1,
1105 .open = pl2303_open,
1106 .close = pl2303_close,
1107 .write = pl2303_write,
1108 .ioctl = pl2303_ioctl,
1109 .break_ctl = pl2303_break_ctl,
1110 .set_termios = pl2303_set_termios,
1111 .tiocmget = pl2303_tiocmget,
1112 .tiocmset = pl2303_tiocmset,
1113 .read_bulk_callback = pl2303_read_bulk_callback,
1114 .read_int_callback = pl2303_read_int_callback,
1115 .write_bulk_callback = pl2303_write_bulk_callback,
1116 .write_room = pl2303_write_room,
1117 .chars_in_buffer = pl2303_chars_in_buffer,
1118 .attach = pl2303_startup,
1119 .shutdown = pl2303_shutdown,
1120};
1da177e4 1121
372db8a7 1122static int __init pl2303_init(void)
1da177e4
LT		 1123{
1124 int retval;
372db8a7 1125
1da177e4
LT		 1126 retval = usb_serial_register(&pl2303_device);
1127 if (retval)
1128 goto failed_usb_serial_register;
1129 retval = usb_register(&pl2303_driver);
1130 if (retval)
1131 goto failed_usb_register;
17a882fc 1132 info(DRIVER_DESC);
1da177e4
LT		 1133 return 0;
1134failed_usb_register:
1135 usb_serial_deregister(&pl2303_device);
1136failed_usb_serial_register:
1137 return retval;
1138}
1139
372db8a7 1140static void __exit pl2303_exit(void)
1da177e4 1141{
372db8a7
TG		 1142 usb_deregister(&pl2303_driver);
1143 usb_serial_deregister(&pl2303_device);
1da177e4
LT		 1144}
1145
1da177e4
LT		 1146module_init(pl2303_init);
1147module_exit(pl2303_exit);
1148
1149MODULE_DESCRIPTION(DRIVER_DESC);
1da177e4
LT		 1150MODULE_LICENSE("GPL");
1151
1152module_param(debug, bool, S_IRUGO | S_IWUSR);
1153MODULE_PARM_DESC(debug, "Debug enabled or not");
1154
Linux 6.x block layer and io_uring tree(s)