[CPUFREQ] If max_freq got reduced (e.g. by _PPC) a write to sysfs scaling_governor...
[linux-2.6] / drivers / usb / serial / ir-usb.c
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         .name =         "ir-usb",
129         .probe =        usb_serial_probe,
130         .disconnect =   usb_serial_disconnect,
131         .id_table =     id_table,
132         .no_dynamic_id =        1,
133 };
134
135
136 static struct usb_serial_driver ir_device = {
137         .driver = {
138                 .owner =        THIS_MODULE,
139                 .name =         "ir-usb",
140         },
141         .description =          "IR Dongle",
142         .id_table =             id_table,
143         .num_interrupt_in =     1,
144         .num_bulk_in =          1,
145         .num_bulk_out =         1,
146         .num_ports =            1,
147         .set_termios =          ir_set_termios,
148         .attach =               ir_startup,
149         .open =                 ir_open,
150         .close =                ir_close,
151         .write =                ir_write,
152         .write_bulk_callback =  ir_write_bulk_callback,
153         .read_bulk_callback =   ir_read_bulk_callback,
154 };
155
156 static inline void irda_usb_dump_class_desc(struct irda_class_desc *desc)
157 {
158         dbg("bLength=%x", desc->bLength);
159         dbg("bDescriptorType=%x", desc->bDescriptorType);
160         dbg("bcdSpecRevision=%x", desc->bcdSpecRevision); 
161         dbg("bmDataSize=%x", desc->bmDataSize);
162         dbg("bmWindowSize=%x", desc->bmWindowSize);
163         dbg("bmMinTurnaroundTime=%d", desc->bmMinTurnaroundTime);
164         dbg("wBaudRate=%x", desc->wBaudRate);
165         dbg("bmAdditionalBOFs=%x", desc->bmAdditionalBOFs);
166         dbg("bIrdaRateSniff=%x", desc->bIrdaRateSniff);
167         dbg("bMaxUnicastList=%x", desc->bMaxUnicastList);
168 }
169
170 /*------------------------------------------------------------------*/
171 /*
172  * Function irda_usb_find_class_desc(dev, ifnum)
173  *
174  *    Returns instance of IrDA class descriptor, or NULL if not found
175  *
176  * The class descriptor is some extra info that IrDA USB devices will
177  * offer to us, describing their IrDA characteristics. We will use that in
178  * irda_usb_init_qos()
179  *
180  * Based on the same function in drivers/net/irda/irda-usb.c
181  */
182 static struct irda_class_desc *irda_usb_find_class_desc(struct usb_device *dev, unsigned int ifnum)
183 {
184         struct irda_class_desc *desc;
185         int ret;
186                 
187         desc = kzalloc(sizeof (struct irda_class_desc), GFP_KERNEL);
188         if (desc == NULL) 
189                 return NULL;
190         
191         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev,0),
192                         IU_REQ_GET_CLASS_DESC,
193                         USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
194                         0, ifnum, desc, sizeof(*desc), 1000);
195         
196         dbg("%s -  ret=%d", __FUNCTION__, ret);
197         if (ret < sizeof(*desc)) {
198                 dbg("%s - class descriptor read %s (%d)",
199                                 __FUNCTION__, 
200                                 (ret<0) ? "failed" : "too short",
201                                 ret);
202                 goto error;
203         }
204         if (desc->bDescriptorType != USB_DT_IRDA) {
205                 dbg("%s - bad class descriptor type", __FUNCTION__);
206                 goto error;
207         }
208         
209         irda_usb_dump_class_desc(desc);
210         return desc;
211 error:
212         kfree(desc);
213         return NULL;
214 }
215
216
217 static u8 ir_xbof_change(u8 xbof)
218 {
219         u8 result;
220         /* reference irda-usb.c */
221         switch(xbof) {
222                 case 48: result = 0x10; break;
223                 case 28:
224                 case 24: result = 0x20; break;
225                 default:
226                 case 12: result = 0x30; break;
227                 case  5:
228                 case  6: result = 0x40; break;
229                 case  3: result = 0x50; break;
230                 case  2: result = 0x60; break;
231                 case  1: result = 0x70; break;
232                 case  0: result = 0x80; break;
233         }
234         return(result);
235 }
236
237
238 static int ir_startup (struct usb_serial *serial)
239 {
240         struct irda_class_desc *irda_desc;
241
242         irda_desc = irda_usb_find_class_desc (serial->dev, 0);
243         if (irda_desc == NULL) {
244                 dev_err (&serial->dev->dev, "IRDA class descriptor not found, device not bound\n");
245                 return -ENODEV;
246         }
247
248         dbg ("%s - Baud rates supported:%s%s%s%s%s%s%s%s%s",
249                 __FUNCTION__,
250                 (irda_desc->wBaudRate & 0x0001) ? " 2400"    : "",
251                 (irda_desc->wBaudRate & 0x0002) ? " 9600"    : "",
252                 (irda_desc->wBaudRate & 0x0004) ? " 19200"   : "",
253                 (irda_desc->wBaudRate & 0x0008) ? " 38400"   : "",
254                 (irda_desc->wBaudRate & 0x0010) ? " 57600"   : "",
255                 (irda_desc->wBaudRate & 0x0020) ? " 115200"  : "",
256                 (irda_desc->wBaudRate & 0x0040) ? " 576000"  : "",
257                 (irda_desc->wBaudRate & 0x0080) ? " 1152000" : "",
258                 (irda_desc->wBaudRate & 0x0100) ? " 4000000" : "");
259
260         switch( irda_desc->bmAdditionalBOFs ) {
261                 case 0x01: ir_add_bof = 48; break;
262                 case 0x02: ir_add_bof = 24; break;
263                 case 0x04: ir_add_bof = 12; break;
264                 case 0x08: ir_add_bof =  6; break;
265                 case 0x10: ir_add_bof =  3; break;
266                 case 0x20: ir_add_bof =  2; break;
267                 case 0x40: ir_add_bof =  1; break;
268                 case 0x80: ir_add_bof =  0; break;
269                 default:;
270         }
271
272         kfree (irda_desc);
273
274         return 0;               
275 }
276
277 static int ir_open (struct usb_serial_port *port, struct file *filp)
278 {
279         char *buffer;
280         int result = 0;
281
282         dbg("%s - port %d", __FUNCTION__, port->number);
283
284         if (buffer_size) {
285                 /* override the default buffer sizes */
286                 buffer = kmalloc (buffer_size, GFP_KERNEL);
287                 if (!buffer) {
288                         dev_err (&port->dev, "%s - out of memory.\n", __FUNCTION__);
289                         return -ENOMEM;
290                 }
291                 kfree (port->read_urb->transfer_buffer);
292                 port->read_urb->transfer_buffer = buffer;
293                 port->read_urb->transfer_buffer_length = buffer_size;
294
295                 buffer = kmalloc (buffer_size, GFP_KERNEL);
296                 if (!buffer) {
297                         dev_err (&port->dev, "%s - out of memory.\n", __FUNCTION__);
298                         return -ENOMEM;
299                 }
300                 kfree (port->write_urb->transfer_buffer);
301                 port->write_urb->transfer_buffer = buffer;
302                 port->write_urb->transfer_buffer_length = buffer_size;
303                 port->bulk_out_size = buffer_size;
304         }
305
306         /* Start reading from the device */
307         usb_fill_bulk_urb (
308                 port->read_urb,
309                 port->serial->dev, 
310                 usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
311                 port->read_urb->transfer_buffer,
312                 port->read_urb->transfer_buffer_length,
313                 ir_read_bulk_callback,
314                 port);
315         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
316         if (result)
317                 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
318
319         return result;
320 }
321
322 static void ir_close (struct usb_serial_port *port, struct file * filp)
323 {
324         dbg("%s - port %d", __FUNCTION__, port->number);
325                          
326         /* shutdown our bulk read */
327         usb_kill_urb(port->read_urb);
328 }
329
330 static int ir_write (struct usb_serial_port *port, const unsigned char *buf, int count)
331 {
332         unsigned char *transfer_buffer;
333         int result;
334         int transfer_size;
335
336         dbg("%s - port = %d, count = %d", __FUNCTION__, port->number, count);
337
338         if (!port->tty) {
339                 dev_err (&port->dev, "%s - no tty???\n", __FUNCTION__);
340                 return 0;
341         }
342
343         if (count == 0)
344                 return 0;
345
346         spin_lock(&port->lock);
347         if (port->write_urb_busy) {
348                 spin_unlock(&port->lock);
349                 dbg("%s - already writing", __FUNCTION__);
350                 return 0;
351         }
352         port->write_urb_busy = 1;
353         spin_unlock(&port->lock);
354
355         transfer_buffer = port->write_urb->transfer_buffer;
356         transfer_size = min(count, port->bulk_out_size - 1);
357
358         /*
359          * The first byte of the packet we send to the device contains an
360          * inband header which indicates an additional number of BOFs and
361          * a baud rate change.
362          *
363          * See section 5.4.2.2 of the USB IrDA spec.
364          */
365         *transfer_buffer = ir_xbof | ir_baud;
366         ++transfer_buffer;
367
368         memcpy (transfer_buffer, buf, transfer_size);
369
370         usb_fill_bulk_urb (
371                 port->write_urb,
372                 port->serial->dev,
373                 usb_sndbulkpipe(port->serial->dev,
374                         port->bulk_out_endpointAddress),
375                 port->write_urb->transfer_buffer,
376                 transfer_size + 1,
377                 ir_write_bulk_callback,
378                 port);
379
380         port->write_urb->transfer_flags = URB_ZERO_PACKET;
381
382         result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
383         if (result) {
384                 port->write_urb_busy = 0;
385                 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
386         } else
387                 result = transfer_size;
388
389         return result;
390 }
391
392 static void ir_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
393 {
394         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
395
396         dbg("%s - port %d", __FUNCTION__, port->number);
397
398         port->write_urb_busy = 0;
399         if (urb->status) {
400                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
401                 return;
402         }
403
404         usb_serial_debug_data (
405                 debug,
406                 &port->dev,
407                 __FUNCTION__,
408                 urb->actual_length,
409                 urb->transfer_buffer);
410
411         schedule_work(&port->work);
412 }
413
414 static void ir_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
415 {
416         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
417         struct tty_struct *tty;
418         unsigned char *data = urb->transfer_buffer;
419         int result;
420
421         dbg("%s - port %d", __FUNCTION__, port->number);
422
423         if (!port->open_count) {
424                 dbg("%s - port closed.", __FUNCTION__);
425                 return;
426         }
427
428         switch (urb->status) {
429
430                 case 0: /* Successful */
431
432                         /*
433                          * The first byte of the packet we get from the device
434                          * contains a busy indicator and baud rate change.
435                          * See section 5.4.1.2 of the USB IrDA spec.
436                          */
437                         if ((*data & 0x0f) > 0)
438                                 ir_baud = *data & 0x0f;
439
440                         usb_serial_debug_data (
441                                 debug,
442                                 &port->dev,
443                                 __FUNCTION__,
444                                 urb->actual_length,
445                                 data);
446
447                         /*
448                          * Bypass flip-buffers, and feed the ldisc directly
449                          * due to our potentially large buffer size.  Since we
450                          * used to set low_latency, this is exactly what the
451                          * tty layer did anyway :)
452                          */
453                         tty = port->tty;
454
455                         /*
456                          *      FIXME: must not do this in IRQ context,
457                          *      must honour TTY_DONT_FLIP
458                          */
459                         tty->ldisc.receive_buf(
460                                 tty,
461                                 data+1,
462                                 NULL,
463                                 urb->actual_length-1);
464
465                         /*
466                          * No break here.
467                          * We want to resubmit the urb so we can read
468                          * again.
469                          */
470
471                 case -EPROTO: /* taking inspiration from pl2303.c */
472
473                         /* Continue trying to always read */
474                         usb_fill_bulk_urb (
475                                 port->read_urb,
476                                 port->serial->dev, 
477                                 usb_rcvbulkpipe(port->serial->dev,
478                                         port->bulk_in_endpointAddress),
479                                 port->read_urb->transfer_buffer,
480                                 port->read_urb->transfer_buffer_length,
481                                 ir_read_bulk_callback,
482                                 port);
483
484                         result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
485                         if (result)
486                                 dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n",
487                                         __FUNCTION__, result);
488
489                         break ;
490
491                 default:
492                         dbg("%s - nonzero read bulk status received: %d",
493                                 __FUNCTION__, 
494                                 urb->status);
495                         break ;
496
497         }
498
499         return;
500 }
501
502 static void ir_set_termios (struct usb_serial_port *port, struct termios *old_termios)
503 {
504         unsigned char *transfer_buffer;
505         unsigned int cflag;
506         int result;
507
508         dbg("%s - port %d", __FUNCTION__, port->number);
509
510         if ((!port->tty) || (!port->tty->termios)) {
511                 dbg("%s - no tty structures", __FUNCTION__);
512                 return;
513         }
514
515         cflag = port->tty->termios->c_cflag;
516         /* check that they really want us to change something */
517         if (old_termios) {
518                 if ((cflag == old_termios->c_cflag) &&
519                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
520                         dbg("%s - nothing to change...", __FUNCTION__);
521                         return;
522                 }
523         }
524
525         /* All we can change is the baud rate */
526         if (cflag & CBAUD) {
527
528                 dbg ("%s - asking for baud %d",
529                         __FUNCTION__,
530                         tty_get_baud_rate(port->tty));
531
532                 /* 
533                  * FIXME, we should compare the baud request against the
534                  * capability stated in the IR header that we got in the
535                  * startup function.
536                  */
537                 switch (cflag & CBAUD) {
538                         case B2400:    ir_baud = SPEED_2400;    break;
539                         default:
540                         case B9600:    ir_baud = SPEED_9600;    break;
541                         case B19200:   ir_baud = SPEED_19200;   break;
542                         case B38400:   ir_baud = SPEED_38400;   break;
543                         case B57600:   ir_baud = SPEED_57600;   break;
544                         case B115200:  ir_baud = SPEED_115200;  break;
545                         case B576000:  ir_baud = SPEED_576000;  break;
546                         case B1152000: ir_baud = SPEED_1152000; break;
547 #ifdef B4000000
548                         case B4000000: ir_baud = SPEED_4000000; break;
549 #endif
550                 }
551
552                 if (xbof == -1) {
553                         ir_xbof = ir_xbof_change(ir_add_bof);
554                 } else {
555                         ir_xbof = ir_xbof_change(xbof) ;
556                 }
557
558                 /* Notify the tty driver that the termios have changed. */
559                 port->tty->ldisc.set_termios(port->tty, NULL);
560
561                 /* FIXME need to check to see if our write urb is busy right
562                  * now, or use a urb pool.
563                  *
564                  * send the baud change out on an "empty" data packet
565                  */
566                 transfer_buffer = port->write_urb->transfer_buffer;
567                 *transfer_buffer = ir_xbof | ir_baud;
568
569                 usb_fill_bulk_urb (
570                         port->write_urb,
571                         port->serial->dev,
572                         usb_sndbulkpipe(port->serial->dev,
573                                 port->bulk_out_endpointAddress),
574                         port->write_urb->transfer_buffer,
575                         1,
576                         ir_write_bulk_callback,
577                         port);
578
579                 port->write_urb->transfer_flags = URB_ZERO_PACKET;
580
581                 result = usb_submit_urb (port->write_urb, GFP_KERNEL);
582                 if (result)
583                         dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
584         }
585         return;
586 }
587
588
589 static int __init ir_init (void)
590 {
591         int retval;
592         retval = usb_serial_register(&ir_device);
593         if (retval)
594                 goto failed_usb_serial_register;
595         retval = usb_register(&ir_driver);
596         if (retval) 
597                 goto failed_usb_register;
598         info(DRIVER_DESC " " DRIVER_VERSION);
599         return 0;
600 failed_usb_register:
601         usb_serial_deregister(&ir_device);
602 failed_usb_serial_register:
603         return retval;
604 }
605
606
607 static void __exit ir_exit (void)
608 {
609         usb_deregister (&ir_driver);
610         usb_serial_deregister (&ir_device);
611 }
612
613
614 module_init(ir_init);
615 module_exit(ir_exit);
616
617 MODULE_AUTHOR(DRIVER_AUTHOR);
618 MODULE_DESCRIPTION(DRIVER_DESC);
619 MODULE_LICENSE("GPL");
620
621 module_param(debug, bool, S_IRUGO | S_IWUSR);
622 MODULE_PARM_DESC(debug, "Debug enabled or not");
623 module_param(xbof, int, 0);
624 MODULE_PARM_DESC(xbof, "Force specific number of XBOFs");
625 module_param(buffer_size, int, 0);
626 MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");
627