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USB: flow control fix for pl2303
[linux-2.6/mini2440.git] / drivers / usb / serial / pl2303.c
blob5027ae9afaab3ba246685fe26523e53787323cbe
1 /*
2 * Prolific PL2303 USB to serial adaptor driver
3 *
4 * Copyright (C) 2001-2004 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 modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License.
12 *
13 * See Documentation/usb/usb-serial.txt for more information on using this driver
14 *
15 */
16
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>
30 #include <linux/usb/serial.h>
31 #include "pl2303.h"
32
33 /*
34 * Version Information
35 */
36 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
37
38 static 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
45 struct pl2303_buf {
46 unsigned int buf_size;
47 char *buf_buf;
48 char *buf_get;
49 char *buf_put;
50 };
51
52 static 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) },
55 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
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) },
64 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID_2080) },
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) },
73 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_SX1) },
74 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
75 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75) },
76 { USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
77 { USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
78 { USB_DEVICE(CA_42_CA42_VENDOR_ID, CA_42_CA42_PRODUCT_ID) },
79 { USB_DEVICE(SAGEM_VENDOR_ID, SAGEM_PRODUCT_ID) },
80 { USB_DEVICE(LEADTEK_VENDOR_ID, LEADTEK_9531_PRODUCT_ID) },
81 { USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
82 { USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
83 { USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
84 { USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
85 { USB_DEVICE(HUAWEI_VENDOR_ID, HUAWEI_PRODUCT_ID) },
86 { USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
87 { } /* Terminating entry */
88 };
89
90 MODULE_DEVICE_TABLE(usb, id_table);
91
92 static struct usb_driver pl2303_driver = {
93 .name = "pl2303",
94 .probe = usb_serial_probe,
95 .disconnect = usb_serial_disconnect,
96 .id_table = id_table,
97 .no_dynamic_id = 1,
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
133
134 enum 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
140 struct 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
151 /*
152 * pl2303_buf_alloc
153 *
154 * Allocate a circular buffer and all associated memory.
155 */
156 static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
157 {
158 struct pl2303_buf *pb;
159
160 if (size == 0)
161 return NULL;
162
163 pb = kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
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 */
184 static 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 */
197 static 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 */
210 static 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 */
224 static 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 */
240 static 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 */
279 static 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 }
309
310 static int pl2303_startup(struct usb_serial *serial)
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) {
327 priv = kzalloc(sizeof(struct pl2303_private), GFP_KERNEL);
328 if (!priv)
329 goto cleanup;
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
342 cleanup:
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
352 static int set_control_lines(struct usb_device *dev, u8 value)
353 {
354 int retval;
355
356 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
357 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
358 value, 0, NULL, 0, 100);
359 dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
360 return retval;
361 }
362
363 static 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,
379 port->bulk_out_size);
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
390 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count,
391 port->write_urb->transfer_buffer);
392
393 port->write_urb->transfer_buffer_length = count;
394 port->write_urb->dev = port->serial->dev;
395 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
396 if (result) {
397 dev_err(&port->dev, "%s - failed submitting write urb,"
398 " error %d\n", __FUNCTION__, result);
399 priv->write_urb_in_use = 0;
400 // TODO: reschedule pl2303_send
401 }
402
403 usb_serial_port_softint(port);
404 }
405
406 static 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
426 static 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
442 static 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
458 static void pl2303_set_termios(struct usb_serial_port *port,
459 struct ktermios *old_termios)
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;
480 port->tty->termios->c_cflag = B9600 | CS8 | CREAD |
481 HUPCL | CLOCAL;
482 priv->termios_initialized = 1;
483 }
484 spin_unlock_irqrestore(&priv->lock, flags);
485
486 cflag = port->tty->termios->c_cflag;
487 /* check that they really want us to change something */
488 if (old_termios) {
489 if ((cflag == old_termios->c_cflag) &&
490 (RELEVANT_IFLAG(port->tty->termios->c_iflag) ==
491 RELEVANT_IFLAG(old_termios->c_iflag))) {
492 dbg("%s - nothing to change...", __FUNCTION__);
493 return;
494 }
495 }
496
497 buf = kzalloc(7, GFP_KERNEL);
498 if (!buf) {
499 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
500 return;
501 }
502
503 i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
504 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
505 0, 0, buf, 7, 100);
506 dbg("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i,
507 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
508
509 if (cflag & CSIZE) {
510 switch (cflag & CSIZE) {
511 case CS5: buf[6] = 5; break;
512 case CS6: buf[6] = 6; break;
513 case CS7: buf[6] = 7; break;
514 default:
515 case CS8: buf[6] = 8; break;
516 }
517 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
518 }
519
520 baud = 0;
521 switch (cflag & CBAUD) {
522 case B0: baud = 0; break;
523 case B75: baud = 75; break;
524 case B150: baud = 150; break;
525 case B300: baud = 300; break;
526 case B600: baud = 600; break;
527 case B1200: baud = 1200; break;
528 case B1800: baud = 1800; break;
529 case B2400: baud = 2400; break;
530 case B4800: baud = 4800; break;
531 case B9600: baud = 9600; break;
532 case B19200: baud = 19200; break;
533 case B38400: baud = 38400; break;
534 case B57600: baud = 57600; break;
535 case B115200: baud = 115200; break;
536 case B230400: baud = 230400; break;
537 case B460800: baud = 460800; break;
538 default:
539 dev_err(&port->dev, "pl2303 driver does not support"
540 " the baudrate requested (fix it)\n");
541 break;
542 }
543 dbg("%s - baud = %d", __FUNCTION__, baud);
544 if (baud) {
545 buf[0] = baud & 0xff;
546 buf[1] = (baud >> 8) & 0xff;
547 buf[2] = (baud >> 16) & 0xff;
548 buf[3] = (baud >> 24) & 0xff;
549 }
550
551 /* For reference buf[4]=0 is 1 stop bits */
552 /* For reference buf[4]=1 is 1.5 stop bits */
553 /* For reference buf[4]=2 is 2 stop bits */
554 if (cflag & CSTOPB) {
555 buf[4] = 2;
556 dbg("%s - stop bits = 2", __FUNCTION__);
557 } else {
558 buf[4] = 0;
559 dbg("%s - stop bits = 1", __FUNCTION__);
560 }
561
562 if (cflag & PARENB) {
563 /* For reference buf[5]=0 is none parity */
564 /* For reference buf[5]=1 is odd parity */
565 /* For reference buf[5]=2 is even parity */
566 /* For reference buf[5]=3 is mark parity */
567 /* For reference buf[5]=4 is space parity */
568 if (cflag & PARODD) {
569 buf[5] = 1;
570 dbg("%s - parity = odd", __FUNCTION__);
571 } else {
572 buf[5] = 2;
573 dbg("%s - parity = even", __FUNCTION__);
574 }
575 } else {
576 buf[5] = 0;
577 dbg("%s - parity = none", __FUNCTION__);
578 }
579
580 i = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
581 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
582 0, 0, buf, 7, 100);
583 dbg("0x21:0x20:0:0 %d", i);
584
585 /* change control lines if we are switching to or from B0 */
586 spin_lock_irqsave(&priv->lock, flags);
587 control = priv->line_control;
588 if ((cflag & CBAUD) == B0)
589 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
590 else
591 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
592 if (control != priv->line_control) {
593 control = priv->line_control;
594 spin_unlock_irqrestore(&priv->lock, flags);
595 set_control_lines(serial->dev, control);
596 } else {
597 spin_unlock_irqrestore(&priv->lock, flags);
598 }
599
600 buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
601
602 i = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
603 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
604 0, 0, buf, 7, 100);
605 dbg("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i,
606 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
607
608 if (cflag & CRTSCTS) {
609 __u16 index;
610 if (priv->type == HX)
611 index = 0x61;
612 else
613 index = 0x41;
614 i = usb_control_msg(serial->dev,
615 usb_sndctrlpipe(serial->dev, 0),
616 VENDOR_WRITE_REQUEST,
617 VENDOR_WRITE_REQUEST_TYPE,
618 0x0, index, NULL, 0, 100);
619 dbg("0x40:0x1:0x0:0x%x %d", index, i);
620 } else {
621 i = usb_control_msg(serial->dev,
622 usb_sndctrlpipe(serial->dev, 0),
623 VENDOR_WRITE_REQUEST,
624 VENDOR_WRITE_REQUEST_TYPE,
625 0x0, 0x0, NULL, 0, 100);
626 dbg ("0x40:0x1:0x0:0x0 %d", i);
627 }
628
629 kfree(buf);
630 }
631
632 static void pl2303_close(struct usb_serial_port *port, struct file *filp)
633 {
634 struct pl2303_private *priv = usb_get_serial_port_data(port);
635 unsigned long flags;
636 unsigned int c_cflag;
637 int bps;
638 long timeout;
639 wait_queue_t wait;
640
641 dbg("%s - port %d", __FUNCTION__, port->number);
642
643 /* wait for data to drain from the buffer */
644 spin_lock_irqsave(&priv->lock, flags);
645 timeout = PL2303_CLOSING_WAIT;
646 init_waitqueue_entry(&wait, current);
647 add_wait_queue(&port->tty->write_wait, &wait);
648 for (;;) {
649 set_current_state(TASK_INTERRUPTIBLE);
650 if (pl2303_buf_data_avail(priv->buf) == 0 ||
651 timeout == 0 || signal_pending(current) ||
652 !usb_get_intfdata(port->serial->interface)) /* disconnect */
653 break;
654 spin_unlock_irqrestore(&priv->lock, flags);
655 timeout = schedule_timeout(timeout);
656 spin_lock_irqsave(&priv->lock, flags);
657 }
658 set_current_state(TASK_RUNNING);
659 remove_wait_queue(&port->tty->write_wait, &wait);
660 /* clear out any remaining data in the buffer */
661 pl2303_buf_clear(priv->buf);
662 spin_unlock_irqrestore(&priv->lock, flags);
663
664 /* wait for characters to drain from the device */
665 /* (this is long enough for the entire 256 byte */
666 /* pl2303 hardware buffer to drain with no flow */
667 /* control for data rates of 1200 bps or more, */
668 /* for lower rates we should really know how much */
669 /* data is in the buffer to compute a delay */
670 /* that is not unnecessarily long) */
671 bps = tty_get_baud_rate(port->tty);
672 if (bps > 1200)
673 timeout = max((HZ*2560)/bps,HZ/10);
674 else
675 timeout = 2*HZ;
676 schedule_timeout_interruptible(timeout);
677
678 /* shutdown our urbs */
679 dbg("%s - shutting down urbs", __FUNCTION__);
680 usb_kill_urb(port->write_urb);
681 usb_kill_urb(port->read_urb);
682 usb_kill_urb(port->interrupt_in_urb);
683
684 if (port->tty) {
685 c_cflag = port->tty->termios->c_cflag;
686 if (c_cflag & HUPCL) {
687 /* drop DTR and RTS */
688 spin_lock_irqsave(&priv->lock, flags);
689 priv->line_control = 0;
690 spin_unlock_irqrestore(&priv->lock, flags);
691 set_control_lines(port->serial->dev, 0);
692 }
693 }
694 }
695
696 static int pl2303_open(struct usb_serial_port *port, struct file *filp)
697 {
698 struct ktermios tmp_termios;
699 struct usb_serial *serial = port->serial;
700 struct pl2303_private *priv = usb_get_serial_port_data(port);
701 unsigned char *buf;
702 int result;
703
704 dbg("%s - port %d", __FUNCTION__, port->number);
705
706 if (priv->type != HX) {
707 usb_clear_halt(serial->dev, port->write_urb->pipe);
708 usb_clear_halt(serial->dev, port->read_urb->pipe);
709 }
710
711 buf = kmalloc(10, GFP_KERNEL);
712 if (buf==NULL)
713 return -ENOMEM;
714
715 #define FISH(a,b,c,d) \
716 result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0), \
717 b, a, c, d, buf, 1, 100); \
718 dbg("0x%x:0x%x:0x%x:0x%x %d - %x",a,b,c,d,result,buf[0]);
719
720 #define SOUP(a,b,c,d) \
721 result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0), \
722 b, a, c, d, NULL, 0, 100); \
723 dbg("0x%x:0x%x:0x%x:0x%x %d",a,b,c,d,result);
724
725 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
726 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
727 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
728 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
729 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
730 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
731 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
732 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
733 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
734 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
735
736 if (priv->type == HX) {
737 /* HX chip */
738 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
739 /* reset upstream data pipes */
740 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
741 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
742 } else {
743 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
744 }
745
746 kfree(buf);
747
748 /* Setup termios */
749 if (port->tty) {
750 pl2303_set_termios(port, &tmp_termios);
751 }
752
753 //FIXME: need to assert RTS and DTR if CRTSCTS off
754
755 dbg("%s - submitting read urb", __FUNCTION__);
756 port->read_urb->dev = serial->dev;
757 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
758 if (result) {
759 dev_err(&port->dev, "%s - failed submitting read urb,"
760 " error %d\n", __FUNCTION__, result);
761 pl2303_close(port, NULL);
762 return -EPROTO;
763 }
764
765 dbg("%s - submitting interrupt urb", __FUNCTION__);
766 port->interrupt_in_urb->dev = serial->dev;
767 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
768 if (result) {
769 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
770 " error %d\n", __FUNCTION__, result);
771 pl2303_close(port, NULL);
772 return -EPROTO;
773 }
774 return 0;
775 }
776
777 static int pl2303_tiocmset(struct usb_serial_port *port, struct file *file,
778 unsigned int set, unsigned int clear)
779 {
780 struct pl2303_private *priv = usb_get_serial_port_data(port);
781 unsigned long flags;
782 u8 control;
783
784 if (!usb_get_intfdata(port->serial->interface))
785 return -ENODEV;
786
787 spin_lock_irqsave(&priv->lock, flags);
788 if (set & TIOCM_RTS)
789 priv->line_control |= CONTROL_RTS;
790 if (set & TIOCM_DTR)
791 priv->line_control |= CONTROL_DTR;
792 if (clear & TIOCM_RTS)
793 priv->line_control &= ~CONTROL_RTS;
794 if (clear & TIOCM_DTR)
795 priv->line_control &= ~CONTROL_DTR;
796 control = priv->line_control;
797 spin_unlock_irqrestore(&priv->lock, flags);
798
799 return set_control_lines(port->serial->dev, control);
800 }
801
802 static int pl2303_tiocmget(struct usb_serial_port *port, struct file *file)
803 {
804 struct pl2303_private *priv = usb_get_serial_port_data(port);
805 unsigned long flags;
806 unsigned int mcr;
807 unsigned int status;
808 unsigned int result;
809
810 dbg("%s (%d)", __FUNCTION__, port->number);
811
812 if (!usb_get_intfdata(port->serial->interface))
813 return -ENODEV;
814
815 spin_lock_irqsave(&priv->lock, flags);
816 mcr = priv->line_control;
817 status = priv->line_status;
818 spin_unlock_irqrestore(&priv->lock, flags);
819
820 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
821 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
822 | ((status & UART_CTS) ? TIOCM_CTS : 0)
823 | ((status & UART_DSR) ? TIOCM_DSR : 0)
824 | ((status & UART_RING) ? TIOCM_RI : 0)
825 | ((status & UART_DCD) ? TIOCM_CD : 0);
826
827 dbg("%s - result = %x", __FUNCTION__, result);
828
829 return result;
830 }
831
832 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
833 {
834 struct pl2303_private *priv = usb_get_serial_port_data(port);
835 unsigned long flags;
836 unsigned int prevstatus;
837 unsigned int status;
838 unsigned int changed;
839
840 spin_lock_irqsave(&priv->lock, flags);
841 prevstatus = priv->line_status;
842 spin_unlock_irqrestore(&priv->lock, flags);
843
844 while (1) {
845 interruptible_sleep_on(&priv->delta_msr_wait);
846 /* see if a signal did it */
847 if (signal_pending(current))
848 return -ERESTARTSYS;
849
850 spin_lock_irqsave(&priv->lock, flags);
851 status = priv->line_status;
852 spin_unlock_irqrestore(&priv->lock, flags);
853
854 changed=prevstatus^status;
855
856 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
857 ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
858 ((arg & TIOCM_CD) && (changed & UART_DCD)) ||
859 ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
860 return 0;
861 }
862 prevstatus = status;
863 }
864 /* NOTREACHED */
865 return 0;
866 }
867
868 static int pl2303_ioctl(struct usb_serial_port *port, struct file *file,
869 unsigned int cmd, unsigned long arg)
870 {
871 dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
872
873 switch (cmd) {
874 case TIOCMIWAIT:
875 dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
876 return wait_modem_info(port, arg);
877
878 default:
879 dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
880 break;
881 }
882
883 return -ENOIOCTLCMD;
884 }
885
886 static void pl2303_break_ctl(struct usb_serial_port *port, int break_state)
887 {
888 struct usb_serial *serial = port->serial;
889 u16 state;
890 int result;
891
892 dbg("%s - port %d", __FUNCTION__, port->number);
893
894 if (break_state == 0)
895 state = BREAK_OFF;
896 else
897 state = BREAK_ON;
898 dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
899
900 result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
901 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
902 0, NULL, 0, 100);
903 if (result)
904 dbg("%s - error sending break = %d", __FUNCTION__, result);
905 }
906
907 static void pl2303_shutdown(struct usb_serial *serial)
908 {
909 int i;
910 struct pl2303_private *priv;
911
912 dbg("%s", __FUNCTION__);
913
914 for (i = 0; i < serial->num_ports; ++i) {
915 priv = usb_get_serial_port_data(serial->port[i]);
916 if (priv) {
917 pl2303_buf_free(priv->buf);
918 kfree(priv);
919 usb_set_serial_port_data(serial->port[i], NULL);
920 }
921 }
922 }
923
924 static void pl2303_update_line_status(struct usb_serial_port *port,
925 unsigned char *data,
926 unsigned int actual_length)
927 {
928
929 struct pl2303_private *priv = usb_get_serial_port_data(port);
930 unsigned long flags;
931 u8 status_idx = UART_STATE;
932 u8 length = UART_STATE + 1;
933 u16 idv, idp;
934
935 idv = le16_to_cpu(port->serial->dev->descriptor.idVendor);
936 idp = le16_to_cpu(port->serial->dev->descriptor.idProduct);
937
938
939 if (idv == SIEMENS_VENDOR_ID) {
940 if (idp == SIEMENS_PRODUCT_ID_X65 ||
941 idp == SIEMENS_PRODUCT_ID_SX1 ||
942 idp == SIEMENS_PRODUCT_ID_X75) {
943
944 length = 1;
945 status_idx = 0;
946 }
947 }
948
949 if (actual_length < length)
950 return;
951
952 /* Save off the uart status for others to look at */
953 spin_lock_irqsave(&priv->lock, flags);
954 priv->line_status = data[status_idx];
955 spin_unlock_irqrestore(&priv->lock, flags);
956 wake_up_interruptible(&priv->delta_msr_wait);
957 }
958
959 static void pl2303_read_int_callback(struct urb *urb)
960 {
961 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
962 unsigned char *data = urb->transfer_buffer;
963 unsigned int actual_length = urb->actual_length;
964 int status;
965
966 dbg("%s (%d)", __FUNCTION__, port->number);
967
968 switch (urb->status) {
969 case 0:
970 /* success */
971 break;
972 case -ECONNRESET:
973 case -ENOENT:
974 case -ESHUTDOWN:
975 /* this urb is terminated, clean up */
976 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
977 urb->status);
978 return;
979 default:
980 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
981 urb->status);
982 goto exit;
983 }
984
985 usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
986 urb->actual_length, urb->transfer_buffer);
987
988 pl2303_update_line_status(port, data, actual_length);
989
990 exit:
991 status = usb_submit_urb(urb, GFP_ATOMIC);
992 if (status)
993 dev_err(&urb->dev->dev,
994 "%s - usb_submit_urb failed with result %d\n",
995 __FUNCTION__, status);
996 }
997
998 static void pl2303_read_bulk_callback(struct urb *urb)
999 {
1000 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
1001 struct pl2303_private *priv = usb_get_serial_port_data(port);
1002 struct tty_struct *tty;
1003 unsigned char *data = urb->transfer_buffer;
1004 unsigned long flags;
1005 int i;
1006 int result;
1007 u8 status;
1008 char tty_flag;
1009
1010 dbg("%s - port %d", __FUNCTION__, port->number);
1011
1012 if (urb->status) {
1013 dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
1014 if (!port->open_count) {
1015 dbg("%s - port is closed, exiting.", __FUNCTION__);
1016 return;
1017 }
1018 if (urb->status == -EPROTO) {
1019 /* PL2303 mysteriously fails with -EPROTO reschedule
1020 * the read */
1021 dbg("%s - caught -EPROTO, resubmitting the urb",
1022 __FUNCTION__);
1023 urb->status = 0;
1024 urb->dev = port->serial->dev;
1025 result = usb_submit_urb(urb, GFP_ATOMIC);
1026 if (result)
1027 dev_err(&urb->dev->dev, "%s - failed"
1028 " resubmitting read urb, error %d\n",
1029 __FUNCTION__, result);
1030 return;
1031 }
1032 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
1033 return;
1034 }
1035
1036 usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
1037 urb->actual_length, data);
1038
1039 /* get tty_flag from status */
1040 tty_flag = TTY_NORMAL;
1041
1042 spin_lock_irqsave(&priv->lock, flags);
1043 status = priv->line_status;
1044 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
1045 spin_unlock_irqrestore(&priv->lock, flags);
1046 wake_up_interruptible(&priv->delta_msr_wait);
1047
1048 /* break takes precedence over parity, */
1049 /* which takes precedence over framing errors */
1050 if (status & UART_BREAK_ERROR )
1051 tty_flag = TTY_BREAK;
1052 else if (status & UART_PARITY_ERROR)
1053 tty_flag = TTY_PARITY;
1054 else if (status & UART_FRAME_ERROR)
1055 tty_flag = TTY_FRAME;
1056 dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
1057
1058 tty = port->tty;
1059 if (tty && urb->actual_length) {
1060 tty_buffer_request_room(tty, urb->actual_length + 1);
1061 /* overrun is special, not associated with a char */
1062 if (status & UART_OVERRUN_ERROR)
1063 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
1064 for (i = 0; i < urb->actual_length; ++i)
1065 tty_insert_flip_char(tty, data[i], tty_flag);
1066 tty_flip_buffer_push(tty);
1067 }
1068
1069 /* Schedule the next read _if_ we are still open */
1070 if (port->open_count) {
1071 urb->dev = port->serial->dev;
1072 result = usb_submit_urb(urb, GFP_ATOMIC);
1073 if (result)
1074 dev_err(&urb->dev->dev, "%s - failed resubmitting"
1075 " read urb, error %d\n", __FUNCTION__, result);
1076 }
1077
1078 return;
1079 }
1080
1081 static void pl2303_write_bulk_callback(struct urb *urb)
1082 {
1083 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
1084 struct pl2303_private *priv = usb_get_serial_port_data(port);
1085 int result;
1086
1087 dbg("%s - port %d", __FUNCTION__, port->number);
1088
1089 switch (urb->status) {
1090 case 0:
1091 /* success */
1092 break;
1093 case -ECONNRESET:
1094 case -ENOENT:
1095 case -ESHUTDOWN:
1096 /* this urb is terminated, clean up */
1097 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
1098 urb->status);
1099 priv->write_urb_in_use = 0;
1100 return;
1101 default:
1102 /* error in the urb, so we have to resubmit it */
1103 dbg("%s - Overflow in write", __FUNCTION__);
1104 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__,
1105 urb->status);
1106 port->write_urb->transfer_buffer_length = 1;
1107 port->write_urb->dev = port->serial->dev;
1108 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1109 if (result)
1110 dev_err(&urb->dev->dev, "%s - failed resubmitting write"
1111 " urb, error %d\n", __FUNCTION__, result);
1112 else
1113 return;
1114 }
1115
1116 priv->write_urb_in_use = 0;
1117
1118 /* send any buffered data */
1119 pl2303_send(port);
1120 }
1121
1122 /* All of the device info needed for the PL2303 SIO serial converter */
1123 static struct usb_serial_driver pl2303_device = {
1124 .driver = {
1125 .owner = THIS_MODULE,
1126 .name = "pl2303",
1127 },
1128 .id_table = id_table,
1129 .usb_driver = &pl2303_driver,
1130 .num_interrupt_in = NUM_DONT_CARE,
1131 .num_bulk_in = 1,
1132 .num_bulk_out = 1,
1133 .num_ports = 1,
1134 .open = pl2303_open,
1135 .close = pl2303_close,
1136 .write = pl2303_write,
1137 .ioctl = pl2303_ioctl,
1138 .break_ctl = pl2303_break_ctl,
1139 .set_termios = pl2303_set_termios,
1140 .tiocmget = pl2303_tiocmget,
1141 .tiocmset = pl2303_tiocmset,
1142 .read_bulk_callback = pl2303_read_bulk_callback,
1143 .read_int_callback = pl2303_read_int_callback,
1144 .write_bulk_callback = pl2303_write_bulk_callback,
1145 .write_room = pl2303_write_room,
1146 .chars_in_buffer = pl2303_chars_in_buffer,
1147 .attach = pl2303_startup,
1148 .shutdown = pl2303_shutdown,
1149 };
1150
1151 static int __init pl2303_init(void)
1152 {
1153 int retval;
1154
1155 retval = usb_serial_register(&pl2303_device);
1156 if (retval)
1157 goto failed_usb_serial_register;
1158 retval = usb_register(&pl2303_driver);
1159 if (retval)
1160 goto failed_usb_register;
1161 info(DRIVER_DESC);
1162 return 0;
1163 failed_usb_register:
1164 usb_serial_deregister(&pl2303_device);
1165 failed_usb_serial_register:
1166 return retval;
1167 }
1168
1169 static void __exit pl2303_exit(void)
1170 {
1171 usb_deregister(&pl2303_driver);
1172 usb_serial_deregister(&pl2303_device);
1173 }
1174
1175 module_init(pl2303_init);
1176 module_exit(pl2303_exit);
1177
1178 MODULE_DESCRIPTION(DRIVER_DESC);
1179 MODULE_LICENSE("GPL");
1180
1181 module_param(debug, bool, S_IRUGO | S_IWUSR);
1182 MODULE_PARM_DESC(debug, "Debug enabled or not");
1183
Support for the Chinese Samsung S3C2440 based development boards