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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / drivers / usb / serial / ir-usb.c
blob59f234df5f89555e96beb87fd54c9cb6dc1d7465
1 /*
2 * USB IR Dongle driver
3 *
4 * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
5 * Copyright (C) 2002 Gary Brubaker (xavyer@ix.netcom.com)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This driver allows a USB IrDA device to be used as a "dumb" serial device.
13 * This can be useful if you do not have access to a full IrDA stack on the
14 * other side of the connection. If you do have an IrDA stack on both devices,
15 * please use the usb-irda driver, as it contains the proper error checking and
16 * other goodness of a full IrDA stack.
17 *
18 * Portions of this driver were taken from drivers/net/irda/irda-usb.c, which
19 * was written by Roman Weissgaerber <weissg@vienna.at>, Dag Brattli
20 * <dag@brattli.net>, and Jean Tourrilhes <jt@hpl.hp.com>
21 *
22 * See Documentation/usb/usb-serial.txt for more information on using this driver
23 *
24 * 2002_Mar_07 greg kh
25 * moved some needed structures and #define values from the
26 * net/irda/irda-usb.h file into our file, as we don't want to depend on
27 * that codebase compiling correctly :)
28 *
29 * 2002_Jan_14 gb
30 * Added module parameter to force specific number of XBOFs.
31 * Added ir_xbof_change().
32 * Reorganized read_bulk_callback error handling.
33 * Switched from FILL_BULK_URB() to usb_fill_bulk_urb().
34 *
35 * 2001_Nov_08 greg kh
36 * Changed the irda_usb_find_class_desc() function based on comments and
37 * code from Martin Diehl.
38 *
39 * 2001_Nov_01 greg kh
40 * Added support for more IrDA USB devices.
41 * Added support for zero packet. Added buffer override paramater, so
42 * users can transfer larger packets at once if they wish. Both patches
43 * came from Dag Brattli <dag@obexcode.com>.
44 *
45 * 2001_Oct_07 greg kh
46 * initial version released.
47 */
48
49 #include <linux/config.h>
50 #include <linux/kernel.h>
51 #include <linux/errno.h>
52 #include <linux/init.h>
53 #include <linux/slab.h>
54 #include <linux/tty.h>
55 #include <linux/tty_driver.h>
56 #include <linux/tty_flip.h>
57 #include <linux/module.h>
58 #include <linux/spinlock.h>
59 #include <asm/uaccess.h>
60 #include <linux/usb.h>
61 #include "usb-serial.h"
62
63 /*
64 * Version Information
65 */
66 #define DRIVER_VERSION "v0.4"
67 #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
68 #define DRIVER_DESC "USB IR Dongle driver"
69
70 /* USB IrDA class spec information */
71 #define USB_CLASS_IRDA 0x02
72 #define USB_DT_IRDA 0x21
73 #define IU_REQ_GET_CLASS_DESC 0x06
74 #define SPEED_2400 0x01
75 #define SPEED_9600 0x02
76 #define SPEED_19200 0x03
77 #define SPEED_38400 0x04
78 #define SPEED_57600 0x05
79 #define SPEED_115200 0x06
80 #define SPEED_576000 0x07
81 #define SPEED_1152000 0x08
82 #define SPEED_4000000 0x09
83
84 struct irda_class_desc {
85 u8 bLength;
86 u8 bDescriptorType;
87 u16 bcdSpecRevision;
88 u8 bmDataSize;
89 u8 bmWindowSize;
90 u8 bmMinTurnaroundTime;
91 u16 wBaudRate;
92 u8 bmAdditionalBOFs;
93 u8 bIrdaRateSniff;
94 u8 bMaxUnicastList;
95 } __attribute__ ((packed));
96
97 static int debug;
98
99 /* if overridden by the user, then use their value for the size of the read and
100 * write urbs */
101 static int buffer_size;
102 /* if overridden by the user, then use the specified number of XBOFs */
103 static int xbof = -1;
104
105 static int ir_startup (struct usb_serial *serial);
106 static int ir_open (struct usb_serial_port *port, struct file *filep);
107 static void ir_close (struct usb_serial_port *port, struct file *filep);
108 static int ir_write (struct usb_serial_port *port, const unsigned char *buf, int count);
109 static void ir_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
110 static void ir_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
111 static void ir_set_termios (struct usb_serial_port *port, struct termios *old_termios);
112
113 static u8 ir_baud = 0;
114 static u8 ir_xbof = 0;
115 static u8 ir_add_bof = 0;
116
117 static struct usb_device_id id_table [] = {
118 { USB_DEVICE(0x050f, 0x0180) }, /* KC Technology, KC-180 */
119 { USB_DEVICE(0x08e9, 0x0100) }, /* XTNDAccess */
120 { USB_DEVICE(0x09c4, 0x0011) }, /* ACTiSys ACT-IR2000U */
121 { USB_INTERFACE_INFO (USB_CLASS_APP_SPEC, USB_CLASS_IRDA, 0) },
122 { } /* Terminating entry */
123 };
124
125 MODULE_DEVICE_TABLE (usb, id_table);
126
127 static struct usb_driver ir_driver = {
128 .owner = THIS_MODULE,
129 .name = "ir-usb",
130 .probe = usb_serial_probe,
131 .disconnect = usb_serial_disconnect,
132 .id_table = id_table,
133 };
134
135
136 static struct usb_serial_device_type ir_device = {
137 .owner = THIS_MODULE,
138 .name = "IR Dongle",
139 .id_table = id_table,
140 .num_interrupt_in = 1,
141 .num_bulk_in = 1,
142 .num_bulk_out = 1,
143 .num_ports = 1,
144 .set_termios = ir_set_termios,
145 .attach = ir_startup,
146 .open = ir_open,
147 .close = ir_close,
148 .write = ir_write,
149 .write_bulk_callback = ir_write_bulk_callback,
150 .read_bulk_callback = ir_read_bulk_callback,
151 };
152
153 static inline void irda_usb_dump_class_desc(struct irda_class_desc *desc)
154 {
155 dbg("bLength=%x", desc->bLength);
156 dbg("bDescriptorType=%x", desc->bDescriptorType);
157 dbg("bcdSpecRevision=%x", desc->bcdSpecRevision);
158 dbg("bmDataSize=%x", desc->bmDataSize);
159 dbg("bmWindowSize=%x", desc->bmWindowSize);
160 dbg("bmMinTurnaroundTime=%d", desc->bmMinTurnaroundTime);
161 dbg("wBaudRate=%x", desc->wBaudRate);
162 dbg("bmAdditionalBOFs=%x", desc->bmAdditionalBOFs);
163 dbg("bIrdaRateSniff=%x", desc->bIrdaRateSniff);
164 dbg("bMaxUnicastList=%x", desc->bMaxUnicastList);
165 }
166
167 /*------------------------------------------------------------------*/
168 /*
169 * Function irda_usb_find_class_desc(dev, ifnum)
170 *
171 * Returns instance of IrDA class descriptor, or NULL if not found
172 *
173 * The class descriptor is some extra info that IrDA USB devices will
174 * offer to us, describing their IrDA characteristics. We will use that in
175 * irda_usb_init_qos()
176 *
177 * Based on the same function in drivers/net/irda/irda-usb.c
178 */
179 static struct irda_class_desc *irda_usb_find_class_desc(struct usb_device *dev, unsigned int ifnum)
180 {
181 struct irda_class_desc *desc;
182 int ret;
183
184 desc = kmalloc(sizeof (struct irda_class_desc), GFP_KERNEL);
185 if (desc == NULL)
186 return NULL;
187 memset(desc, 0, sizeof(struct irda_class_desc));
188
189 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev,0),
190 IU_REQ_GET_CLASS_DESC,
191 USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
192 0, ifnum, desc, sizeof(*desc), 1000);
193
194 dbg("%s - ret=%d", __FUNCTION__, ret);
195 if (ret < sizeof(*desc)) {
196 dbg("%s - class descriptor read %s (%d)",
197 __FUNCTION__,
198 (ret<0) ? "failed" : "too short",
199 ret);
200 goto error;
201 }
202 if (desc->bDescriptorType != USB_DT_IRDA) {
203 dbg("%s - bad class descriptor type", __FUNCTION__);
204 goto error;
205 }
206
207 irda_usb_dump_class_desc(desc);
208 return desc;
209 error:
210 kfree(desc);
211 return NULL;
212 }
213
214
215 static u8 ir_xbof_change(u8 xbof)
216 {
217 u8 result;
218 /* reference irda-usb.c */
219 switch(xbof) {
220 case 48: result = 0x10; break;
221 case 28:
222 case 24: result = 0x20; break;
223 default:
224 case 12: result = 0x30; break;
225 case 5:
226 case 6: result = 0x40; break;
227 case 3: result = 0x50; break;
228 case 2: result = 0x60; break;
229 case 1: result = 0x70; break;
230 case 0: result = 0x80; break;
231 }
232 return(result);
233 }
234
235
236 static int ir_startup (struct usb_serial *serial)
237 {
238 struct irda_class_desc *irda_desc;
239
240 irda_desc = irda_usb_find_class_desc (serial->dev, 0);
241 if (irda_desc == NULL) {
242 dev_err (&serial->dev->dev, "IRDA class descriptor not found, device not bound\n");
243 return -ENODEV;
244 }
245
246 dbg ("%s - Baud rates supported:%s%s%s%s%s%s%s%s%s",
247 __FUNCTION__,
248 (irda_desc->wBaudRate & 0x0001) ? " 2400" : "",
249 (irda_desc->wBaudRate & 0x0002) ? " 9600" : "",
250 (irda_desc->wBaudRate & 0x0004) ? " 19200" : "",
251 (irda_desc->wBaudRate & 0x0008) ? " 38400" : "",
252 (irda_desc->wBaudRate & 0x0010) ? " 57600" : "",
253 (irda_desc->wBaudRate & 0x0020) ? " 115200" : "",
254 (irda_desc->wBaudRate & 0x0040) ? " 576000" : "",
255 (irda_desc->wBaudRate & 0x0080) ? " 1152000" : "",
256 (irda_desc->wBaudRate & 0x0100) ? " 4000000" : "");
257
258 switch( irda_desc->bmAdditionalBOFs ) {
259 case 0x01: ir_add_bof = 48; break;
260 case 0x02: ir_add_bof = 24; break;
261 case 0x04: ir_add_bof = 12; break;
262 case 0x08: ir_add_bof = 6; break;
263 case 0x10: ir_add_bof = 3; break;
264 case 0x20: ir_add_bof = 2; break;
265 case 0x40: ir_add_bof = 1; break;
266 case 0x80: ir_add_bof = 0; break;
267 default:;
268 }
269
270 kfree (irda_desc);
271
272 return 0;
273 }
274
275 static int ir_open (struct usb_serial_port *port, struct file *filp)
276 {
277 char *buffer;
278 int result = 0;
279
280 dbg("%s - port %d", __FUNCTION__, port->number);
281
282 if (buffer_size) {
283 /* override the default buffer sizes */
284 buffer = kmalloc (buffer_size, GFP_KERNEL);
285 if (!buffer) {
286 dev_err (&port->dev, "%s - out of memory.\n", __FUNCTION__);
287 return -ENOMEM;
288 }
289 kfree (port->read_urb->transfer_buffer);
290 port->read_urb->transfer_buffer = buffer;
291 port->read_urb->transfer_buffer_length = buffer_size;
292
293 buffer = kmalloc (buffer_size, GFP_KERNEL);
294 if (!buffer) {
295 dev_err (&port->dev, "%s - out of memory.\n", __FUNCTION__);
296 return -ENOMEM;
297 }
298 kfree (port->write_urb->transfer_buffer);
299 port->write_urb->transfer_buffer = buffer;
300 port->write_urb->transfer_buffer_length = buffer_size;
301 port->bulk_out_size = buffer_size;
302 }
303
304 /* Start reading from the device */
305 usb_fill_bulk_urb (
306 port->read_urb,
307 port->serial->dev,
308 usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
309 port->read_urb->transfer_buffer,
310 port->read_urb->transfer_buffer_length,
311 ir_read_bulk_callback,
312 port);
313 result = usb_submit_urb(port->read_urb, GFP_KERNEL);
314 if (result)
315 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
316
317 return result;
318 }
319
320 static void ir_close (struct usb_serial_port *port, struct file * filp)
321 {
322 dbg("%s - port %d", __FUNCTION__, port->number);
323
324 /* shutdown our bulk read */
325 usb_kill_urb(port->read_urb);
326 }
327
328 static int ir_write (struct usb_serial_port *port, const unsigned char *buf, int count)
329 {
330 unsigned char *transfer_buffer;
331 int result;
332 int transfer_size;
333
334 dbg("%s - port = %d, count = %d", __FUNCTION__, port->number, count);
335
336 if (!port->tty) {
337 dev_err (&port->dev, "%s - no tty???\n", __FUNCTION__);
338 return 0;
339 }
340
341 if (count == 0)
342 return 0;
343
344 if (port->write_urb->status == -EINPROGRESS) {
345 dbg ("%s - already writing", __FUNCTION__);
346 return 0;
347 }
348
349 transfer_buffer = port->write_urb->transfer_buffer;
350 transfer_size = min(count, port->bulk_out_size - 1);
351
352 /*
353 * The first byte of the packet we send to the device contains an
354 * inband header which indicates an additional number of BOFs and
355 * a baud rate change.
356 *
357 * See section 5.4.2.2 of the USB IrDA spec.
358 */
359 *transfer_buffer = ir_xbof | ir_baud;
360 ++transfer_buffer;
361
362 memcpy (transfer_buffer, buf, transfer_size);
363
364 usb_fill_bulk_urb (
365 port->write_urb,
366 port->serial->dev,
367 usb_sndbulkpipe(port->serial->dev,
368 port->bulk_out_endpointAddress),
369 port->write_urb->transfer_buffer,
370 transfer_size + 1,
371 ir_write_bulk_callback,
372 port);
373
374 port->write_urb->transfer_flags = URB_ZERO_PACKET;
375
376 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
377 if (result)
378 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
379 else
380 result = transfer_size;
381
382 return result;
383 }
384
385 static void ir_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
386 {
387 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
388
389 dbg("%s - port %d", __FUNCTION__, port->number);
390
391 if (urb->status) {
392 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
393 return;
394 }
395
396 usb_serial_debug_data (
397 debug,
398 &port->dev,
399 __FUNCTION__,
400 urb->actual_length,
401 urb->transfer_buffer);
402
403 schedule_work(&port->work);
404 }
405
406 static void ir_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
407 {
408 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
409 struct tty_struct *tty;
410 unsigned char *data = urb->transfer_buffer;
411 int result;
412
413 dbg("%s - port %d", __FUNCTION__, port->number);
414
415 if (!port->open_count) {
416 dbg("%s - port closed.", __FUNCTION__);
417 return;
418 }
419
420 switch (urb->status) {
421
422 case 0: /* Successful */
423
424 /*
425 * The first byte of the packet we get from the device
426 * contains a busy indicator and baud rate change.
427 * See section 5.4.1.2 of the USB IrDA spec.
428 */
429 if ((*data & 0x0f) > 0)
430 ir_baud = *data & 0x0f;
431
432 usb_serial_debug_data (
433 debug,
434 &port->dev,
435 __FUNCTION__,
436 urb->actual_length,
437 data);
438
439 /*
440 * Bypass flip-buffers, and feed the ldisc directly
441 * due to our potentially large buffer size. Since we
442 * used to set low_latency, this is exactly what the
443 * tty layer did anyway :)
444 */
445 tty = port->tty;
446
447 /*
448 * FIXME: must not do this in IRQ context,
449 * must honour TTY_DONT_FLIP
450 */
451 tty->ldisc.receive_buf(
452 tty,
453 data+1,
454 NULL,
455 urb->actual_length-1);
456
457 /*
458 * No break here.
459 * We want to resubmit the urb so we can read
460 * again.
461 */
462
463 case -EPROTO: /* taking inspiration from pl2303.c */
464
465 /* Continue trying to always read */
466 usb_fill_bulk_urb (
467 port->read_urb,
468 port->serial->dev,
469 usb_rcvbulkpipe(port->serial->dev,
470 port->bulk_in_endpointAddress),
471 port->read_urb->transfer_buffer,
472 port->read_urb->transfer_buffer_length,
473 ir_read_bulk_callback,
474 port);
475
476 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
477 if (result)
478 dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n",
479 __FUNCTION__, result);
480
481 break ;
482
483 default:
484 dbg("%s - nonzero read bulk status received: %d",
485 __FUNCTION__,
486 urb->status);
487 break ;
488
489 }
490
491 return;
492 }
493
494 static void ir_set_termios (struct usb_serial_port *port, struct termios *old_termios)
495 {
496 unsigned char *transfer_buffer;
497 unsigned int cflag;
498 int result;
499
500 dbg("%s - port %d", __FUNCTION__, port->number);
501
502 if ((!port->tty) || (!port->tty->termios)) {
503 dbg("%s - no tty structures", __FUNCTION__);
504 return;
505 }
506
507 cflag = port->tty->termios->c_cflag;
508 /* check that they really want us to change something */
509 if (old_termios) {
510 if ((cflag == old_termios->c_cflag) &&
511 (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
512 dbg("%s - nothing to change...", __FUNCTION__);
513 return;
514 }
515 }
516
517 /* All we can change is the baud rate */
518 if (cflag & CBAUD) {
519
520 dbg ("%s - asking for baud %d",
521 __FUNCTION__,
522 tty_get_baud_rate(port->tty));
523
524 /*
525 * FIXME, we should compare the baud request against the
526 * capability stated in the IR header that we got in the
527 * startup function.
528 */
529 switch (cflag & CBAUD) {
530 case B2400: ir_baud = SPEED_2400; break;
531 default:
532 case B9600: ir_baud = SPEED_9600; break;
533 case B19200: ir_baud = SPEED_19200; break;
534 case B38400: ir_baud = SPEED_38400; break;
535 case B57600: ir_baud = SPEED_57600; break;
536 case B115200: ir_baud = SPEED_115200; break;
537 case B576000: ir_baud = SPEED_576000; break;
538 case B1152000: ir_baud = SPEED_1152000; break;
539 #ifdef B4000000
540 case B4000000: ir_baud = SPEED_4000000; break;
541 #endif
542 }
543
544 if (xbof == -1) {
545 ir_xbof = ir_xbof_change(ir_add_bof);
546 } else {
547 ir_xbof = ir_xbof_change(xbof) ;
548 }
549
550 /* Notify the tty driver that the termios have changed. */
551 port->tty->ldisc.set_termios(port->tty, NULL);
552
553 /* FIXME need to check to see if our write urb is busy right
554 * now, or use a urb pool.
555 *
556 * send the baud change out on an "empty" data packet
557 */
558 transfer_buffer = port->write_urb->transfer_buffer;
559 *transfer_buffer = ir_xbof | ir_baud;
560
561 usb_fill_bulk_urb (
562 port->write_urb,
563 port->serial->dev,
564 usb_sndbulkpipe(port->serial->dev,
565 port->bulk_out_endpointAddress),
566 port->write_urb->transfer_buffer,
567 1,
568 ir_write_bulk_callback,
569 port);
570
571 port->write_urb->transfer_flags = URB_ZERO_PACKET;
572
573 result = usb_submit_urb (port->write_urb, GFP_KERNEL);
574 if (result)
575 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
576 }
577 return;
578 }
579
580
581 static int __init ir_init (void)
582 {
583 int retval;
584 retval = usb_serial_register(&ir_device);
585 if (retval)
586 goto failed_usb_serial_register;
587 retval = usb_register(&ir_driver);
588 if (retval)
589 goto failed_usb_register;
590 info(DRIVER_DESC " " DRIVER_VERSION);
591 return 0;
592 failed_usb_register:
593 usb_serial_deregister(&ir_device);
594 failed_usb_serial_register:
595 return retval;
596 }
597
598
599 static void __exit ir_exit (void)
600 {
601 usb_deregister (&ir_driver);
602 usb_serial_deregister (&ir_device);
603 }
604
605
606 module_init(ir_init);
607 module_exit(ir_exit);
608
609 MODULE_AUTHOR(DRIVER_AUTHOR);
610 MODULE_DESCRIPTION(DRIVER_DESC);
611 MODULE_LICENSE("GPL");
612
613 module_param(debug, bool, S_IRUGO | S_IWUSR);
614 MODULE_PARM_DESC(debug, "Debug enabled or not");
615 module_param(xbof, int, 0);
616 MODULE_PARM_DESC(xbof, "Force specific number of XBOFs");
617 module_param(buffer_size, int, 0);
618 MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");
619
Verdex Pro support