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[PATCH] pl2303 - unplug device.
[deliverable/linux.git] / drivers / usb / serial / pl2303.c
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1da177e4
LT		 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, or
12 * (at your option) any later version.
13 *
14 * See Documentation/usb/usb-serial.txt for more information on using this driver
15 *
16 * 2002_Mar_26 gkh
17 * allowed driver to work properly if there is no tty assigned to a port
18 * (this happens for serial console devices.)
19 *
20 * 2001_Oct_06 gkh
21 * Added RTS and DTR line control. Thanks to joe@bndlg.de for parts of it.
22 *
23 * 2001_Sep_19 gkh
24 * Added break support.
25 *
26 * 2001_Aug_30 gkh
27 * fixed oops in write_bulk_callback.
28 *
29 * 2001_Aug_28 gkh
30 * reworked buffer logic to be like other usb-serial drivers. Hopefully
31 * removing some reported problems.
32 *
33 * 2001_Jun_06 gkh
34 * finished porting to 2.4 format.
35 *
36 */
37
38#include <linux/config.h>
39#include <linux/kernel.h>
40#include <linux/errno.h>
41#include <linux/init.h>
42#include <linux/slab.h>
43#include <linux/tty.h>
44#include <linux/tty_driver.h>
45#include <linux/tty_flip.h>
46#include <linux/serial.h>
47#include <linux/module.h>
48#include <linux/moduleparam.h>
49#include <linux/spinlock.h>
50#include <asm/uaccess.h>
51#include <linux/usb.h>
52#include "usb-serial.h"
53#include "pl2303.h"
54
55/*
56 * Version Information
57 */
58#define DRIVER_VERSION "v0.12"
59#define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
60
61static int debug;
62
63#define PL2303_CLOSING_WAIT (30*HZ)
64
65#define PL2303_BUF_SIZE 1024
66#define PL2303_TMP_BUF_SIZE 1024
67
68static DECLARE_MUTEX(pl2303_tmp_buf_sem);
69
70struct pl2303_buf {
71 unsigned int buf_size;
72 char *buf_buf;
73 char *buf_get;
74 char *buf_put;
75};
76
77static struct usb_device_id id_table [] = {
78 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
79 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
80 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
81 { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
82 { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
83 { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
84 { USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
85 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
86 { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
87 { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
88 { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
89 { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
90 { USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
91 { USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
92 { USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
93 { USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
94 { USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
95 { USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
96 { USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
97 { } /* Terminating entry */
98};
99
100MODULE_DEVICE_TABLE (usb, id_table);
101
102static struct usb_driver pl2303_driver = {
103 .owner = THIS_MODULE,
104 .name = "pl2303",
105 .probe = usb_serial_probe,
106 .disconnect = usb_serial_disconnect,
107 .id_table = id_table,
108};
109
110#define SET_LINE_REQUEST_TYPE 0x21
111#define SET_LINE_REQUEST 0x20
112
113#define SET_CONTROL_REQUEST_TYPE 0x21
114#define SET_CONTROL_REQUEST 0x22
115#define CONTROL_DTR 0x01
116#define CONTROL_RTS 0x02
117
118#define BREAK_REQUEST_TYPE 0x21
119#define BREAK_REQUEST 0x23
120#define BREAK_ON 0xffff
121#define BREAK_OFF 0x0000
122
123#define GET_LINE_REQUEST_TYPE 0xa1
124#define GET_LINE_REQUEST 0x21
125
126#define VENDOR_WRITE_REQUEST_TYPE 0x40
127#define VENDOR_WRITE_REQUEST 0x01
128
129#define VENDOR_READ_REQUEST_TYPE 0xc0
130#define VENDOR_READ_REQUEST 0x01
131
132#define UART_STATE 0x08
133#define UART_STATE_TRANSIENT_MASK 0x74
134#define UART_DCD 0x01
135#define UART_DSR 0x02
136#define UART_BREAK_ERROR 0x04
137#define UART_RING 0x08
138#define UART_FRAME_ERROR 0x10
139#define UART_PARITY_ERROR 0x20
140#define UART_OVERRUN_ERROR 0x40
141#define UART_CTS 0x80
142
143/* function prototypes for a PL2303 serial converter */
144static int pl2303_open (struct usb_serial_port *port, struct file *filp);
145static void pl2303_close (struct usb_serial_port *port, struct file *filp);
146static void pl2303_set_termios (struct usb_serial_port *port,
147 struct termios *old);
148static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
149 unsigned int cmd, unsigned long arg);
150static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
151static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
152static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
153static int pl2303_write (struct usb_serial_port *port,
154 const unsigned char *buf, int count);
155static void pl2303_send (struct usb_serial_port *port);
156static int pl2303_write_room(struct usb_serial_port *port);
157static int pl2303_chars_in_buffer(struct usb_serial_port *port);
158static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
159static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
160static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
161 unsigned int set, unsigned int clear);
162static int pl2303_startup (struct usb_serial *serial);
163static void pl2303_shutdown (struct usb_serial *serial);
164static struct pl2303_buf *pl2303_buf_alloc(unsigned int size);
165static void pl2303_buf_free(struct pl2303_buf *pb);
166static void pl2303_buf_clear(struct pl2303_buf *pb);
167static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb);
168static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb);
169static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
170 unsigned int count);
171static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
172 unsigned int count);
173
174
175/* All of the device info needed for the PL2303 SIO serial converter */
176static struct usb_serial_device_type pl2303_device = {
177 .owner = THIS_MODULE,
178 .name = "PL-2303",
179 .id_table = id_table,
180 .num_interrupt_in = NUM_DONT_CARE,
181 .num_bulk_in = 1,
182 .num_bulk_out = 1,
183 .num_ports = 1,
184 .open = pl2303_open,
185 .close = pl2303_close,
186 .write = pl2303_write,
187 .ioctl = pl2303_ioctl,
188 .break_ctl = pl2303_break_ctl,
189 .set_termios = pl2303_set_termios,
190 .tiocmget = pl2303_tiocmget,
191 .tiocmset = pl2303_tiocmset,
192 .read_bulk_callback = pl2303_read_bulk_callback,
193 .read_int_callback = pl2303_read_int_callback,
194 .write_bulk_callback = pl2303_write_bulk_callback,
195 .write_room = pl2303_write_room,
196 .chars_in_buffer = pl2303_chars_in_buffer,
197 .attach = pl2303_startup,
198 .shutdown = pl2303_shutdown,
199};
200
201enum pl2303_type {
202 type_0, /* don't know the difference between type 0 and */
203 type_1, /* type 1, until someone from prolific tells us... */
204 HX, /* HX version of the pl2303 chip */
205};
206
207struct pl2303_private {
208 spinlock_t lock;
209 struct pl2303_buf *buf;
210 int write_urb_in_use;
211 wait_queue_head_t delta_msr_wait;
212 u8 line_control;
213 u8 line_status;
214 u8 termios_initialized;
215 enum pl2303_type type;
216};
217
218
219static int pl2303_startup (struct usb_serial *serial)
220{
221 struct pl2303_private *priv;
222 enum pl2303_type type = type_0;
223 int i;
224
225 if (serial->dev->descriptor.bDeviceClass == 0x02)
226 type = type_0;
227 else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
228 type = HX;
229 else if (serial->dev->descriptor.bDeviceClass == 0x00)
230 type = type_1;
231 else if (serial->dev->descriptor.bDeviceClass == 0xFF)
232 type = type_1;
233 dbg("device type: %d", type);
234
235 for (i = 0; i < serial->num_ports; ++i) {
236 priv = kmalloc (sizeof (struct pl2303_private), GFP_KERNEL);
237 if (!priv)
238 goto cleanup;
239 memset (priv, 0x00, sizeof (struct pl2303_private));
240 spin_lock_init(&priv->lock);
241 priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
242 if (priv->buf == NULL) {
243 kfree(priv);
244 goto cleanup;
245 }
246 init_waitqueue_head(&priv->delta_msr_wait);
247 priv->type = type;
248 usb_set_serial_port_data(serial->port[i], priv);
249 }
250 return 0;
251
252cleanup:
253 for (--i; i>=0; --i) {
254 priv = usb_get_serial_port_data(serial->port[i]);
255 pl2303_buf_free(priv->buf);
256 kfree(priv);
257 usb_set_serial_port_data(serial->port[i], NULL);
258 }
259 return -ENOMEM;
260}
261
262static int set_control_lines (struct usb_device *dev, u8 value)
263{
264 int retval;
265
266 retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0),
267 SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
268 value, 0, NULL, 0, 100);
269 dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
270 return retval;
271}
272
273static int pl2303_write (struct usb_serial_port *port, const unsigned char *buf, int count)
274{
275 struct pl2303_private *priv = usb_get_serial_port_data(port);
276 unsigned long flags;
277
278 dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
279
280 if (!count)
281 return count;
282
283 spin_lock_irqsave(&priv->lock, flags);
284 count = pl2303_buf_put(priv->buf, buf, count);
285 spin_unlock_irqrestore(&priv->lock, flags);
286
287 pl2303_send(port);
288
289 return count;
290}
291
292static void pl2303_send(struct usb_serial_port *port)
293{
294 int count, result;
295 struct pl2303_private *priv = usb_get_serial_port_data(port);
296 unsigned long flags;
297
298 dbg("%s - port %d", __FUNCTION__, port->number);
299
300 spin_lock_irqsave(&priv->lock, flags);
301
302 if (priv->write_urb_in_use) {
303 spin_unlock_irqrestore(&priv->lock, flags);
304 return;
305 }
306
307 count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
308 port->bulk_out_size);
309
310 if (count == 0) {
311 spin_unlock_irqrestore(&priv->lock, flags);
312 return;
313 }
314
315 priv->write_urb_in_use = 1;
316
317 spin_unlock_irqrestore(&priv->lock, flags);
318
319 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
320
321 port->write_urb->transfer_buffer_length = count;
322 port->write_urb->dev = port->serial->dev;
323 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
324 if (result) {
325 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
326 priv->write_urb_in_use = 0;
327 // TODO: reschedule pl2303_send
328 }
329
330 schedule_work(&port->work);
331}
332
333static int pl2303_write_room(struct usb_serial_port *port)
334{
335 struct pl2303_private *priv = usb_get_serial_port_data(port);
336 int room = 0;
337 unsigned long flags;
338
339 dbg("%s - port %d", __FUNCTION__, port->number);
340
341 spin_lock_irqsave(&priv->lock, flags);
342 room = pl2303_buf_space_avail(priv->buf);
343 spin_unlock_irqrestore(&priv->lock, flags);
344
345 dbg("%s - returns %d", __FUNCTION__, room);
346 return room;
347}
348
349static int pl2303_chars_in_buffer(struct usb_serial_port *port)
350{
351 struct pl2303_private *priv = usb_get_serial_port_data(port);
352 int chars = 0;
353 unsigned long flags;
354
355 dbg("%s - port %d", __FUNCTION__, port->number);
356
357 spin_lock_irqsave(&priv->lock, flags);
358 chars = pl2303_buf_data_avail(priv->buf);
359 spin_unlock_irqrestore(&priv->lock, flags);
360
361 dbg("%s - returns %d", __FUNCTION__, chars);
362 return chars;
363}
364
365static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
366{
367 struct usb_serial *serial = port->serial;
368 struct pl2303_private *priv = usb_get_serial_port_data(port);
369 unsigned long flags;
370 unsigned int cflag;
371 unsigned char *buf;
372 int baud;
373 int i;
374 u8 control;
375
376 dbg("%s - port %d", __FUNCTION__, port->number);
377
378 if ((!port->tty) || (!port->tty->termios)) {
379 dbg("%s - no tty structures", __FUNCTION__);
380 return;
381 }
382
383 spin_lock_irqsave(&priv->lock, flags);
384 if (!priv->termios_initialized) {
385 *(port->tty->termios) = tty_std_termios;
386 port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
387 priv->termios_initialized = 1;
388 }
389 spin_unlock_irqrestore(&priv->lock, flags);
390
391 cflag = port->tty->termios->c_cflag;
392 /* check that they really want us to change something */
393 if (old_termios) {
394 if ((cflag == old_termios->c_cflag) &&
395 (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
396 dbg("%s - nothing to change...", __FUNCTION__);
397 return;
398 }
399 }
400
401 buf = kmalloc (7, GFP_KERNEL);
402 if (!buf) {
403 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
404 return;
405 }
406 memset (buf, 0x00, 0x07);
407
408 i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
409 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
410 0, 0, buf, 7, 100);
411 dbg ("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i,
412 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
413
414
415 if (cflag & CSIZE) {
416 switch (cflag & CSIZE) {
417 case CS5: buf[6] = 5; break;
418 case CS6: buf[6] = 6; break;
419 case CS7: buf[6] = 7; break;
420 default:
421 case CS8: buf[6] = 8; break;
422 }
423 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
424 }
425
426 baud = 0;
427 switch (cflag & CBAUD) {
428 case B0: baud = 0; break;
429 case B75: baud = 75; break;
430 case B150: baud = 150; break;
431 case B300: baud = 300; break;
432 case B600: baud = 600; break;
433 case B1200: baud = 1200; break;
434 case B1800: baud = 1800; break;
435 case B2400: baud = 2400; break;
436 case B4800: baud = 4800; break;
437 case B9600: baud = 9600; break;
438 case B19200: baud = 19200; break;
439 case B38400: baud = 38400; break;
440 case B57600: baud = 57600; break;
441 case B115200: baud = 115200; break;
442 case B230400: baud = 230400; break;
443 case B460800: baud = 460800; break;
444 default:
445 dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
446 break;
447 }
448 dbg("%s - baud = %d", __FUNCTION__, baud);
449 if (baud) {
450 buf[0] = baud & 0xff;
451 buf[1] = (baud >> 8) & 0xff;
452 buf[2] = (baud >> 16) & 0xff;
453 buf[3] = (baud >> 24) & 0xff;
454 }
455
456 /* For reference buf[4]=0 is 1 stop bits */
457 /* For reference buf[4]=1 is 1.5 stop bits */
458 /* For reference buf[4]=2 is 2 stop bits */
459 if (cflag & CSTOPB) {
460 buf[4] = 2;
461 dbg("%s - stop bits = 2", __FUNCTION__);
462 } else {
463 buf[4] = 0;
464 dbg("%s - stop bits = 1", __FUNCTION__);
465 }
466
467 if (cflag & PARENB) {
468 /* For reference buf[5]=0 is none parity */
469 /* For reference buf[5]=1 is odd parity */
470 /* For reference buf[5]=2 is even parity */
471 /* For reference buf[5]=3 is mark parity */
472 /* For reference buf[5]=4 is space parity */
473 if (cflag & PARODD) {
474 buf[5] = 1;
475 dbg("%s - parity = odd", __FUNCTION__);
476 } else {
477 buf[5] = 2;
478 dbg("%s - parity = even", __FUNCTION__);
479 }
480 } else {
481 buf[5] = 0;
482 dbg("%s - parity = none", __FUNCTION__);
483 }
484
485 i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
486 SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
487 0, 0, buf, 7, 100);
488 dbg ("0x21:0x20:0:0 %d", i);
489
490 /* change control lines if we are switching to or from B0 */
491 spin_lock_irqsave(&priv->lock, flags);
492 control = priv->line_control;
493 if ((cflag & CBAUD) == B0)
494 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
495 else
496 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
497 if (control != priv->line_control) {
498 control = priv->line_control;
499 spin_unlock_irqrestore(&priv->lock, flags);
500 set_control_lines(serial->dev, control);
501 } else {
502 spin_unlock_irqrestore(&priv->lock, flags);
503 }
504
505 buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
506
507 i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
508 GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
509 0, 0, buf, 7, 100);
510 dbg ("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i,
511 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
512
513 if (cflag & CRTSCTS) {
514 __u16 index;
515 if (priv->type == HX)
516 index = 0x61;
517 else
518 index = 0x41;
519 i = usb_control_msg(serial->dev,
520 usb_sndctrlpipe(serial->dev, 0),
521 VENDOR_WRITE_REQUEST,
522 VENDOR_WRITE_REQUEST_TYPE,
523 0x0, index, NULL, 0, 100);
524 dbg ("0x40:0x1:0x0:0x%x %d", index, i);
525 }
526
527 kfree (buf);
528}
529
530static int pl2303_open (struct usb_serial_port *port, struct file *filp)
531{
532 struct termios tmp_termios;
533 struct usb_serial *serial = port->serial;
534 struct pl2303_private *priv = usb_get_serial_port_data(port);
535 unsigned char *buf;
536 int result;
537
538 dbg("%s - port %d", __FUNCTION__, port->number);
539
540 usb_clear_halt(serial->dev, port->write_urb->pipe);
541 usb_clear_halt(serial->dev, port->read_urb->pipe);
542
543 buf = kmalloc(10, GFP_KERNEL);
544 if (buf==NULL)
545 return -ENOMEM;
546
547#define FISH(a,b,c,d) \
548 result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0), \
549 b, a, c, d, buf, 1, 100); \
550 dbg("0x%x:0x%x:0x%x:0x%x %d - %x",a,b,c,d,result,buf[0]);
551
552#define SOUP(a,b,c,d) \
553 result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0), \
554 b, a, c, d, NULL, 0, 100); \
555 dbg("0x%x:0x%x:0x%x:0x%x %d",a,b,c,d,result);
556
557 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
558 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
559 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
560 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
561 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
562 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
563 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
564 FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
565 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
566 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
567
568 if (priv->type == HX) {
569 /* HX chip */
570 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
571 /* reset upstream data pipes */
572 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
573 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
574 } else {
575 SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
576 }
577
578 kfree(buf);
579
580 /* Setup termios */
581 if (port->tty) {
582 pl2303_set_termios (port, &tmp_termios);
583 }
584
585 //FIXME: need to assert RTS and DTR if CRTSCTS off
586
587 dbg("%s - submitting read urb", __FUNCTION__);
588 port->read_urb->dev = serial->dev;
589 result = usb_submit_urb (port->read_urb, GFP_KERNEL);
590 if (result) {
591 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
592 pl2303_close (port, NULL);
593 return -EPROTO;
594 }
595
596 dbg("%s - submitting interrupt urb", __FUNCTION__);
597 port->interrupt_in_urb->dev = serial->dev;
598 result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
599 if (result) {
600 dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
601 pl2303_close (port, NULL);
602 return -EPROTO;
603 }
604 return 0;
605}
606
607
608static void pl2303_close (struct usb_serial_port *port, struct file *filp)
609{
610 struct pl2303_private *priv = usb_get_serial_port_data(port);
611 unsigned long flags;
612 unsigned int c_cflag;
613 int bps;
614 long timeout;
615 wait_queue_t wait; \
616
617 dbg("%s - port %d", __FUNCTION__, port->number);
618
619 /* wait for data to drain from the buffer */
620 spin_lock_irqsave(&priv->lock, flags);
621 timeout = PL2303_CLOSING_WAIT;
622 init_waitqueue_entry(&wait, current);
623 add_wait_queue(&port->tty->write_wait, &wait);
624 for (;;) {
625 set_current_state(TASK_INTERRUPTIBLE);
626 if (pl2303_buf_data_avail(priv->buf) == 0
627 || timeout == 0 || signal_pending(current)
628 || !usb_get_intfdata(port->serial->interface)) /* disconnect */
629 break;
630 spin_unlock_irqrestore(&priv->lock, flags);
631 timeout = schedule_timeout(timeout);
632 spin_lock_irqsave(&priv->lock, flags);
633 }
634 set_current_state(TASK_RUNNING);
635 remove_wait_queue(&port->tty->write_wait, &wait);
636 /* clear out any remaining data in the buffer */
637 pl2303_buf_clear(priv->buf);
638 spin_unlock_irqrestore(&priv->lock, flags);
639
640 /* wait for characters to drain from the device */
641 /* (this is long enough for the entire 256 byte */
642 /* pl2303 hardware buffer to drain with no flow */
643 /* control for data rates of 1200 bps or more, */
644 /* for lower rates we should really know how much */
645 /* data is in the buffer to compute a delay */
646 /* that is not unnecessarily long) */
647 bps = tty_get_baud_rate(port->tty);
648 if (bps > 1200)
649 timeout = max((HZ*2560)/bps,HZ/10);
650 else
651 timeout = 2*HZ;
652 set_current_state(TASK_INTERRUPTIBLE);
653 schedule_timeout(timeout);
654
655 /* shutdown our urbs */
656 dbg("%s - shutting down urbs", __FUNCTION__);
657 usb_kill_urb(port->write_urb);
658 usb_kill_urb(port->read_urb);
659 usb_kill_urb(port->interrupt_in_urb);
660
661 if (port->tty) {
662 c_cflag = port->tty->termios->c_cflag;
663 if (c_cflag & HUPCL) {
664 /* drop DTR and RTS */
665 spin_lock_irqsave(&priv->lock, flags);
666 priv->line_control = 0;
667 spin_unlock_irqrestore (&priv->lock, flags);
668 set_control_lines (port->serial->dev, 0);
669 }
670 }
671}
672
673static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
674 unsigned int set, unsigned int clear)
675{
676 struct pl2303_private *priv = usb_get_serial_port_data(port);
677 unsigned long flags;
678 u8 control;
679
6fdd8e8e
FL		 680 if (!usb_get_intfdata(port->serial->interface))
681 return -ENODEV;
682
1da177e4
LT		 683 spin_lock_irqsave (&priv->lock, flags);
684 if (set & TIOCM_RTS)
685 priv->line_control |= CONTROL_RTS;
686 if (set & TIOCM_DTR)
687 priv->line_control |= CONTROL_DTR;
688 if (clear & TIOCM_RTS)
689 priv->line_control &= ~CONTROL_RTS;
690 if (clear & TIOCM_DTR)
691 priv->line_control &= ~CONTROL_DTR;
692 control = priv->line_control;
693 spin_unlock_irqrestore (&priv->lock, flags);
694
695 return set_control_lines (port->serial->dev, control);
696}
697
698static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
699{
700 struct pl2303_private *priv = usb_get_serial_port_data(port);
701 unsigned long flags;
702 unsigned int mcr;
703 unsigned int status;
704 unsigned int result;
705
706 dbg("%s (%d)", __FUNCTION__, port->number);
707
6fdd8e8e
FL		 708 if (!usb_get_intfdata(port->serial->interface))
709 return -ENODEV;
710
1da177e4
LT		 711 spin_lock_irqsave (&priv->lock, flags);
712 mcr = priv->line_control;
713 status = priv->line_status;
714 spin_unlock_irqrestore (&priv->lock, flags);
715
716 result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
717 | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
718 | ((status & UART_CTS) ? TIOCM_CTS : 0)
719 | ((status & UART_DSR) ? TIOCM_DSR : 0)
720 | ((status & UART_RING) ? TIOCM_RI : 0)
721 | ((status & UART_DCD) ? TIOCM_CD : 0);
722
723 dbg("%s - result = %x", __FUNCTION__, result);
724
725 return result;
726}
727
728static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
729{
730 struct pl2303_private *priv = usb_get_serial_port_data(port);
731 unsigned long flags;
732 unsigned int prevstatus;
733 unsigned int status;
734 unsigned int changed;
735
736 spin_lock_irqsave (&priv->lock, flags);
737 prevstatus = priv->line_status;
738 spin_unlock_irqrestore (&priv->lock, flags);
739
740 while (1) {
741 interruptible_sleep_on(&priv->delta_msr_wait);
742 /* see if a signal did it */
743 if (signal_pending(current))
744 return -ERESTARTSYS;
745
746 spin_lock_irqsave (&priv->lock, flags);
747 status = priv->line_status;
748 spin_unlock_irqrestore (&priv->lock, flags);
749
750 changed=prevstatus^status;
751
752 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
753 ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
754 ((arg & TIOCM_CD) && (changed & UART_DCD)) ||
755 ((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
756 return 0;
757 }
758 prevstatus = status;
759 }
760 /* NOTREACHED */
761 return 0;
762}
763
764static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
765{
766 dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
767
768 switch (cmd) {
769 case TIOCMIWAIT:
770 dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
771 return wait_modem_info(port, arg);
772
773 default:
774 dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
775 break;
776 }
777
778 return -ENOIOCTLCMD;
779}
780
781static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
782{
783 struct usb_serial *serial = port->serial;
784 u16 state;
785 int result;
786
787 dbg("%s - port %d", __FUNCTION__, port->number);
788
789 if (break_state == 0)
790 state = BREAK_OFF;
791 else
792 state = BREAK_ON;
793 dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
794
795 result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
796 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
797 0, NULL, 0, 100);
798 if (result)
799 dbg("%s - error sending break = %d", __FUNCTION__, result);
800}
801
802
803static void pl2303_shutdown (struct usb_serial *serial)
804{
805 int i;
806 struct pl2303_private *priv;
807
808 dbg("%s", __FUNCTION__);
809
810 for (i = 0; i < serial->num_ports; ++i) {
811 priv = usb_get_serial_port_data(serial->port[i]);
812 if (priv) {
813 pl2303_buf_free(priv->buf);
814 kfree(priv);
815 usb_set_serial_port_data(serial->port[i], NULL);
816 }
817 }
818}
819
820
821static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
822{
823 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
824 struct pl2303_private *priv = usb_get_serial_port_data(port);
825 unsigned char *data = urb->transfer_buffer;
826 unsigned long flags;
827 int status;
828 u8 uart_state;
829
830 dbg("%s (%d)", __FUNCTION__, port->number);
831
832 switch (urb->status) {
833 case 0:
834 /* success */
835 break;
836 case -ECONNRESET:
837 case -ENOENT:
838 case -ESHUTDOWN:
839 /* this urb is terminated, clean up */
840 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
841 return;
842 default:
843 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
844 goto exit;
845 }
846
847
848 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
849
850 if (urb->actual_length < UART_STATE)
851 goto exit;
852
853 /* Save off the uart status for others to look at */
854 uart_state = data[UART_STATE];
855 spin_lock_irqsave(&priv->lock, flags);
856 uart_state |= (priv->line_status & UART_STATE_TRANSIENT_MASK);
857 priv->line_status = uart_state;
858 spin_unlock_irqrestore(&priv->lock, flags);
859
860exit:
861 status = usb_submit_urb (urb, GFP_ATOMIC);
862 if (status)
863 dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
864 __FUNCTION__, status);
865}
866
867
868static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
869{
870 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
871 struct pl2303_private *priv = usb_get_serial_port_data(port);
872 struct tty_struct *tty;
873 unsigned char *data = urb->transfer_buffer;
874 unsigned long flags;
875 int i;
876 int result;
877 u8 status;
878 char tty_flag;
879
880 dbg("%s - port %d", __FUNCTION__, port->number);
881
882 if (urb->status) {
883 dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
884 if (!port->open_count) {
885 dbg("%s - port is closed, exiting.", __FUNCTION__);
886 return;
887 }
888 if (urb->status == -EPROTO) {
889 /* PL2303 mysteriously fails with -EPROTO reschedule the read */
890 dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
891 urb->status = 0;
892 urb->dev = port->serial->dev;
893 result = usb_submit_urb(urb, GFP_ATOMIC);
894 if (result)
895 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
896 return;
897 }
898 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
899 return;
900 }
901
902 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
903
904 /* get tty_flag from status */
905 tty_flag = TTY_NORMAL;
906
907 spin_lock_irqsave(&priv->lock, flags);
908 status = priv->line_status;
909 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
910 spin_unlock_irqrestore(&priv->lock, flags);
911 wake_up_interruptible (&priv->delta_msr_wait);
912
913 /* break takes precedence over parity, */
914 /* which takes precedence over framing errors */
915 if (status & UART_BREAK_ERROR )
916 tty_flag = TTY_BREAK;
917 else if (status & UART_PARITY_ERROR)
918 tty_flag = TTY_PARITY;
919 else if (status & UART_FRAME_ERROR)
920 tty_flag = TTY_FRAME;
921 dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
922
923 tty = port->tty;
924 if (tty && urb->actual_length) {
925 /* overrun is special, not associated with a char */
926 if (status & UART_OVERRUN_ERROR)
927 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
928
929 for (i = 0; i < urb->actual_length; ++i) {
930 if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
931 tty_flip_buffer_push(tty);
932 }
933 tty_insert_flip_char (tty, data[i], tty_flag);
934 }
935 tty_flip_buffer_push (tty);
936 }
937
938 /* Schedule the next read _if_ we are still open */
939 if (port->open_count) {
940 urb->dev = port->serial->dev;
941 result = usb_submit_urb(urb, GFP_ATOMIC);
942 if (result)
943 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
944 }
945
946 return;
947}
948
949
950
951static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
952{
953 struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
954 struct pl2303_private *priv = usb_get_serial_port_data(port);
955 int result;
956
957 dbg("%s - port %d", __FUNCTION__, port->number);
958
959 switch (urb->status) {
960 case 0:
961 /* success */
962 break;
963 case -ECONNRESET:
964 case -ENOENT:
965 case -ESHUTDOWN:
966 /* this urb is terminated, clean up */
967 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
968 priv->write_urb_in_use = 0;
969 return;
970 default:
971 /* error in the urb, so we have to resubmit it */
972 dbg("%s - Overflow in write", __FUNCTION__);
973 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
974 port->write_urb->transfer_buffer_length = 1;
975 port->write_urb->dev = port->serial->dev;
976 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
977 if (result)
978 dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result);
979 else
980 return;
981 }
982
983 priv->write_urb_in_use = 0;
984
985 /* send any buffered data */
986 pl2303_send(port);
987}
988
989
990/*
991 * pl2303_buf_alloc
992 *
993 * Allocate a circular buffer and all associated memory.
994 */
995
996static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
997{
998
999 struct pl2303_buf *pb;
1000
1001
1002 if (size == 0)
1003 return NULL;
1004
1005 pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
1006 if (pb == NULL)
1007 return NULL;
1008
1009 pb->buf_buf = kmalloc(size, GFP_KERNEL);
1010 if (pb->buf_buf == NULL) {
1011 kfree(pb);
1012 return NULL;
1013 }
1014
1015 pb->buf_size = size;
1016 pb->buf_get = pb->buf_put = pb->buf_buf;
1017
1018 return pb;
1019
1020}
1021
1022
1023/*
1024 * pl2303_buf_free
1025 *
1026 * Free the buffer and all associated memory.
1027 */
1028
1029static void pl2303_buf_free(struct pl2303_buf *pb)
1030{
1031 if (pb != NULL) {
1032 if (pb->buf_buf != NULL)
1033 kfree(pb->buf_buf);
1034 kfree(pb);
1035 }
1036}
1037
1038
1039/*
1040 * pl2303_buf_clear
1041 *
1042 * Clear out all data in the circular buffer.
1043 */
1044
1045static void pl2303_buf_clear(struct pl2303_buf *pb)
1046{
1047 if (pb != NULL)
1048 pb->buf_get = pb->buf_put;
1049 /* equivalent to a get of all data available */
1050}
1051
1052
1053/*
1054 * pl2303_buf_data_avail
1055 *
1056 * Return the number of bytes of data available in the circular
1057 * buffer.
1058 */
1059
1060static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
1061{
1062 if (pb != NULL)
1063 return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
1064 else
1065 return 0;
1066}
1067
1068
1069/*
1070 * pl2303_buf_space_avail
1071 *
1072 * Return the number of bytes of space available in the circular
1073 * buffer.
1074 */
1075
1076static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
1077{
1078 if (pb != NULL)
1079 return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
1080 else
1081 return 0;
1082}
1083
1084
1085/*
1086 * pl2303_buf_put
1087 *
1088 * Copy data data from a user buffer and put it into the circular buffer.
1089 * Restrict to the amount of space available.
1090 *
1091 * Return the number of bytes copied.
1092 */
1093
1094static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
1095 unsigned int count)
1096{
1097
1098 unsigned int len;
1099
1100
1101 if (pb == NULL)
1102 return 0;
1103
1104 len = pl2303_buf_space_avail(pb);
1105 if (count > len)
1106 count = len;
1107
1108 if (count == 0)
1109 return 0;
1110
1111 len = pb->buf_buf + pb->buf_size - pb->buf_put;
1112 if (count > len) {
1113 memcpy(pb->buf_put, buf, len);
1114 memcpy(pb->buf_buf, buf+len, count - len);
1115 pb->buf_put = pb->buf_buf + count - len;
1116 } else {
1117 memcpy(pb->buf_put, buf, count);
1118 if (count < len)
1119 pb->buf_put += count;
1120 else /* count == len */
1121 pb->buf_put = pb->buf_buf;
1122 }
1123
1124 return count;
1125
1126}
1127
1128
1129/*
1130 * pl2303_buf_get
1131 *
1132 * Get data from the circular buffer and copy to the given buffer.
1133 * Restrict to the amount of data available.
1134 *
1135 * Return the number of bytes copied.
1136 */
1137
1138static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
1139 unsigned int count)
1140{
1141
1142 unsigned int len;
1143
1144
1145 if (pb == NULL)
1146 return 0;
1147
1148 len = pl2303_buf_data_avail(pb);
1149 if (count > len)
1150 count = len;
1151
1152 if (count == 0)
1153 return 0;
1154
1155 len = pb->buf_buf + pb->buf_size - pb->buf_get;
1156 if (count > len) {
1157 memcpy(buf, pb->buf_get, len);
1158 memcpy(buf+len, pb->buf_buf, count - len);
1159 pb->buf_get = pb->buf_buf + count - len;
1160 } else {
1161 memcpy(buf, pb->buf_get, count);
1162 if (count < len)
1163 pb->buf_get += count;
1164 else /* count == len */
1165 pb->buf_get = pb->buf_buf;
1166 }
1167
1168 return count;
1169
1170}
1171
1172static int __init pl2303_init (void)
1173{
1174 int retval;
1175 retval = usb_serial_register(&pl2303_device);
1176 if (retval)
1177 goto failed_usb_serial_register;
1178 retval = usb_register(&pl2303_driver);
1179 if (retval)
1180 goto failed_usb_register;
1181 info(DRIVER_DESC " " DRIVER_VERSION);
1182 return 0;
1183failed_usb_register:
1184 usb_serial_deregister(&pl2303_device);
1185failed_usb_serial_register:
1186 return retval;
1187}
1188
1189
1190static void __exit pl2303_exit (void)
1191{
1192 usb_deregister (&pl2303_driver);
1193 usb_serial_deregister (&pl2303_device);
1194}
1195
1196
1197module_init(pl2303_init);
1198module_exit(pl2303_exit);
1199
1200MODULE_DESCRIPTION(DRIVER_DESC);
1201MODULE_VERSION(DRIVER_VERSION);
1202MODULE_LICENSE("GPL");
1203
1204module_param(debug, bool, S_IRUGO | S_IWUSR);
1205MODULE_PARM_DESC(debug, "Debug enabled or not");
1206
Linux kernel - Deliverables
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