a903595515759b9f9dd19203758c07a37bb2616e
[linux-2.6.git] / drivers / usb / input / keyspan_remote.c
1 /*
2  * keyspan_remote: USB driver for the Keyspan DMR
3  *
4  * Copyright (C) 2005 Zymeta Corporation - Michael Downey (downey@zymeta.com)
5  *
6  *      This program is free software; you can redistribute it and/or
7  *      modify it under the terms of the GNU General Public License as
8  *      published by the Free Software Foundation, version 2.
9  *
10  * This driver has been put together with the support of Innosys, Inc.
11  * and Keyspan, Inc the manufacturers of the Keyspan USB DMR product.
12  */
13
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/init.h>
17 #include <linux/slab.h>
18 #include <linux/module.h>
19 #include <linux/moduleparam.h>
20 #include <linux/usb/input.h>
21
22 #define DRIVER_VERSION  "v0.1"
23 #define DRIVER_AUTHOR   "Michael Downey <downey@zymeta.com>"
24 #define DRIVER_DESC     "Driver for the USB Keyspan remote control."
25 #define DRIVER_LICENSE  "GPL"
26
27 /* Parameters that can be passed to the driver. */
28 static int debug;
29 module_param(debug, int, 0444);
30 MODULE_PARM_DESC(debug, "Enable extra debug messages and information");
31
32 /* Vendor and product ids */
33 #define USB_KEYSPAN_VENDOR_ID           0x06CD
34 #define USB_KEYSPAN_PRODUCT_UIA11       0x0202
35
36 /* Defines for converting the data from the remote. */
37 #define ZERO            0x18
38 #define ZERO_MASK       0x1F    /* 5 bits for a 0 */
39 #define ONE             0x3C
40 #define ONE_MASK        0x3F    /* 6 bits for a 1 */
41 #define SYNC            0x3F80
42 #define SYNC_MASK       0x3FFF  /* 14 bits for a SYNC sequence */
43 #define STOP            0x00
44 #define STOP_MASK       0x1F    /* 5 bits for the STOP sequence */
45 #define GAP             0xFF
46
47 #define RECV_SIZE       8       /* The UIA-11 type have a 8 byte limit. */
48
49 /* table of devices that work with this driver */
50 static struct usb_device_id keyspan_table[] = {
51         { USB_DEVICE(USB_KEYSPAN_VENDOR_ID, USB_KEYSPAN_PRODUCT_UIA11) },
52         { }                                     /* Terminating entry */
53 };
54
55 /* Structure to store all the real stuff that a remote sends to us. */
56 struct keyspan_message {
57         u16     system;
58         u8      button;
59         u8      toggle;
60 };
61
62 /* Structure used for all the bit testing magic needed to be done. */
63 struct bit_tester {
64         u32     tester;
65         int     len;
66         int     pos;
67         int     bits_left;
68         u8      buffer[32];
69 };
70
71 /* Structure to hold all of our driver specific stuff */
72 struct usb_keyspan {
73         char                            name[128];
74         char                            phys[64];
75         struct usb_device*              udev;
76         struct input_dev                *input;
77         struct usb_interface*           interface;
78         struct usb_endpoint_descriptor* in_endpoint;
79         struct urb*                     irq_urb;
80         int                             open;
81         dma_addr_t                      in_dma;
82         unsigned char*                  in_buffer;
83
84         /* variables used to parse messages from remote. */
85         struct bit_tester               data;
86         int                             stage;
87         int                             toggle;
88 };
89
90 /*
91  * Table that maps the 31 possible keycodes to input keys.
92  * Currently there are 15 and 17 button models so RESERVED codes
93  * are blank areas in the mapping.
94  */
95 static const int keyspan_key_table[] = {
96         KEY_RESERVED,           /* 0 is just a place holder. */
97         KEY_RESERVED,
98         KEY_STOP,
99         KEY_PLAYCD,
100         KEY_RESERVED,
101         KEY_PREVIOUSSONG,
102         KEY_REWIND,
103         KEY_FORWARD,
104         KEY_NEXTSONG,
105         KEY_RESERVED,
106         KEY_RESERVED,
107         KEY_RESERVED,
108         KEY_PAUSE,
109         KEY_VOLUMEUP,
110         KEY_RESERVED,
111         KEY_RESERVED,
112         KEY_RESERVED,
113         KEY_VOLUMEDOWN,
114         KEY_RESERVED,
115         KEY_UP,
116         KEY_RESERVED,
117         KEY_MUTE,
118         KEY_LEFT,
119         KEY_ENTER,
120         KEY_RIGHT,
121         KEY_RESERVED,
122         KEY_RESERVED,
123         KEY_DOWN,
124         KEY_RESERVED,
125         KEY_KPASTERISK,
126         KEY_RESERVED,
127         KEY_MENU
128 };
129
130 static struct usb_driver keyspan_driver;
131
132 /*
133  * Debug routine that prints out what we've received from the remote.
134  */
135 static void keyspan_print(struct usb_keyspan* dev) /*unsigned char* data)*/
136 {
137         char codes[4 * RECV_SIZE];
138         int i;
139
140         for (i = 0; i < RECV_SIZE; i++)
141                 snprintf(codes + i * 3, 4, "%02x ", dev->in_buffer[i]);
142
143         dev_info(&dev->udev->dev, "%s\n", codes);
144 }
145
146 /*
147  * Routine that manages the bit_tester structure.  It makes sure that there are
148  * at least bits_needed bits loaded into the tester.
149  */
150 static int keyspan_load_tester(struct usb_keyspan* dev, int bits_needed)
151 {
152         if (dev->data.bits_left >= bits_needed)
153                 return 0;
154
155         /*
156          * Somehow we've missed the last message. The message will be repeated
157          * though so it's not too big a deal
158          */
159         if (dev->data.pos >= dev->data.len) {
160                 dev_dbg(&dev->udev->dev,
161                         "%s - Error ran out of data. pos: %d, len: %d\n",
162                         __FUNCTION__, dev->data.pos, dev->data.len);
163                 return -1;
164         }
165
166         /* Load as much as we can into the tester. */
167         while ((dev->data.bits_left + 7 < (sizeof(dev->data.tester) * 8)) &&
168                (dev->data.pos < dev->data.len)) {
169                 dev->data.tester += (dev->data.buffer[dev->data.pos++] << dev->data.bits_left);
170                 dev->data.bits_left += 8;
171         }
172
173         return 0;
174 }
175
176 /*
177  * Routine that handles all the logic needed to parse out the message from the remote.
178  */
179 static void keyspan_check_data(struct usb_keyspan *remote, struct pt_regs *regs)
180 {
181         int i;
182         int found = 0;
183         struct keyspan_message message;
184
185         switch(remote->stage) {
186         case 0:
187                 /*
188                  * In stage 0 we want to find the start of a message.  The remote sends a 0xFF as filler.
189                  * So the first byte that isn't a FF should be the start of a new message.
190                  */
191                 for (i = 0; i < RECV_SIZE && remote->in_buffer[i] == GAP; ++i);
192
193                 if (i < RECV_SIZE) {
194                         memcpy(remote->data.buffer, remote->in_buffer, RECV_SIZE);
195                         remote->data.len = RECV_SIZE;
196                         remote->data.pos = 0;
197                         remote->data.tester = 0;
198                         remote->data.bits_left = 0;
199                         remote->stage = 1;
200                 }
201                 break;
202
203         case 1:
204                 /*
205                  * Stage 1 we should have 16 bytes and should be able to detect a
206                  * SYNC.  The SYNC is 14 bits, 7 0's and then 7 1's.
207                  */
208                 memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE);
209                 remote->data.len += RECV_SIZE;
210
211                 found = 0;
212                 while ((remote->data.bits_left >= 14 || remote->data.pos < remote->data.len) && !found) {
213                         for (i = 0; i < 8; ++i) {
214                                 if (keyspan_load_tester(remote, 14) != 0) {
215                                         remote->stage = 0;
216                                         return;
217                                 }
218
219                                 if ((remote->data.tester & SYNC_MASK) == SYNC) {
220                                         remote->data.tester = remote->data.tester >> 14;
221                                         remote->data.bits_left -= 14;
222                                         found = 1;
223                                         break;
224                                 } else {
225                                         remote->data.tester = remote->data.tester >> 1;
226                                         --remote->data.bits_left;
227                                 }
228                         }
229                 }
230
231                 if (!found) {
232                         remote->stage = 0;
233                         remote->data.len = 0;
234                 } else {
235                         remote->stage = 2;
236                 }
237                 break;
238
239         case 2:
240                 /*
241                  * Stage 2 we should have 24 bytes which will be enough for a full
242                  * message.  We need to parse out the system code, button code,
243                  * toggle code, and stop.
244                  */
245                 memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE);
246                 remote->data.len += RECV_SIZE;
247
248                 message.system = 0;
249                 for (i = 0; i < 9; i++) {
250                         keyspan_load_tester(remote, 6);
251
252                         if ((remote->data.tester & ZERO_MASK) == ZERO) {
253                                 message.system = message.system << 1;
254                                 remote->data.tester = remote->data.tester >> 5;
255                                 remote->data.bits_left -= 5;
256                         } else if ((remote->data.tester & ONE_MASK) == ONE) {
257                                 message.system = (message.system << 1) + 1;
258                                 remote->data.tester = remote->data.tester >> 6;
259                                 remote->data.bits_left -= 6;
260                         } else {
261                                 err("%s - Unknown sequence found in system data.\n", __FUNCTION__);
262                                 remote->stage = 0;
263                                 return;
264                         }
265                 }
266
267                 message.button = 0;
268                 for (i = 0; i < 5; i++) {
269                         keyspan_load_tester(remote, 6);
270
271                         if ((remote->data.tester & ZERO_MASK) == ZERO) {
272                                 message.button = message.button << 1;
273                                 remote->data.tester = remote->data.tester >> 5;
274                                 remote->data.bits_left -= 5;
275                         } else if ((remote->data.tester & ONE_MASK) == ONE) {
276                                 message.button = (message.button << 1) + 1;
277                                 remote->data.tester = remote->data.tester >> 6;
278                                 remote->data.bits_left -= 6;
279                         } else {
280                                 err("%s - Unknown sequence found in button data.\n", __FUNCTION__);
281                                 remote->stage = 0;
282                                 return;
283                         }
284                 }
285
286                 keyspan_load_tester(remote, 6);
287                 if ((remote->data.tester & ZERO_MASK) == ZERO) {
288                         message.toggle = 0;
289                         remote->data.tester = remote->data.tester >> 5;
290                         remote->data.bits_left -= 5;
291                 } else if ((remote->data.tester & ONE_MASK) == ONE) {
292                         message.toggle = 1;
293                         remote->data.tester = remote->data.tester >> 6;
294                         remote->data.bits_left -= 6;
295                 } else {
296                         err("%s - Error in message, invalid toggle.\n", __FUNCTION__);
297                         remote->stage = 0;
298                         return;
299                 }
300
301                 keyspan_load_tester(remote, 5);
302                 if ((remote->data.tester & STOP_MASK) == STOP) {
303                         remote->data.tester = remote->data.tester >> 5;
304                         remote->data.bits_left -= 5;
305                 } else {
306                         err("Bad message recieved, no stop bit found.\n");
307                 }
308
309                 dev_dbg(&remote->udev->dev,
310                         "%s found valid message: system: %d, button: %d, toggle: %d\n",
311                         __FUNCTION__, message.system, message.button, message.toggle);
312
313                 if (message.toggle != remote->toggle) {
314                         input_regs(remote->input, regs);
315                         input_report_key(remote->input, keyspan_key_table[message.button], 1);
316                         input_report_key(remote->input, keyspan_key_table[message.button], 0);
317                         input_sync(remote->input);
318                         remote->toggle = message.toggle;
319                 }
320
321                 remote->stage = 0;
322                 break;
323         }
324 }
325
326 /*
327  * Routine for sending all the initialization messages to the remote.
328  */
329 static int keyspan_setup(struct usb_device* dev)
330 {
331         int retval = 0;
332
333         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
334                                  0x11, 0x40, 0x5601, 0x0, NULL, 0, 0);
335         if (retval) {
336                 dev_dbg(&dev->dev, "%s - failed to set bit rate due to error: %d\n",
337                         __FUNCTION__, retval);
338                 return(retval);
339         }
340
341         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
342                                  0x44, 0x40, 0x0, 0x0, NULL, 0, 0);
343         if (retval) {
344                 dev_dbg(&dev->dev, "%s - failed to set resume sensitivity due to error: %d\n",
345                         __FUNCTION__, retval);
346                 return(retval);
347         }
348
349         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
350                                  0x22, 0x40, 0x0, 0x0, NULL, 0, 0);
351         if (retval) {
352                 dev_dbg(&dev->dev, "%s - failed to turn receive on due to error: %d\n",
353                         __FUNCTION__, retval);
354                 return(retval);
355         }
356
357         dev_dbg(&dev->dev, "%s - Setup complete.\n", __FUNCTION__);
358         return(retval);
359 }
360
361 /*
362  * Routine used to handle a new message that has come in.
363  */
364 static void keyspan_irq_recv(struct urb *urb, struct pt_regs *regs)
365 {
366         struct usb_keyspan *dev = urb->context;
367         int retval;
368
369         /* Check our status in case we need to bail out early. */
370         switch (urb->status) {
371         case 0:
372                 break;
373
374         /* Device went away so don't keep trying to read from it. */
375         case -ECONNRESET:
376         case -ENOENT:
377         case -ESHUTDOWN:
378                 return;
379
380         default:
381                 goto resubmit;
382                 break;
383         }
384
385         if (debug)
386                 keyspan_print(dev);
387
388         keyspan_check_data(dev, regs);
389
390 resubmit:
391         retval = usb_submit_urb(urb, GFP_ATOMIC);
392         if (retval)
393                 err ("%s - usb_submit_urb failed with result: %d", __FUNCTION__, retval);
394 }
395
396 static int keyspan_open(struct input_dev *dev)
397 {
398         struct usb_keyspan *remote = dev->private;
399
400         remote->irq_urb->dev = remote->udev;
401         if (usb_submit_urb(remote->irq_urb, GFP_KERNEL))
402                 return -EIO;
403
404         return 0;
405 }
406
407 static void keyspan_close(struct input_dev *dev)
408 {
409         struct usb_keyspan *remote = dev->private;
410
411         usb_kill_urb(remote->irq_urb);
412 }
413
414 static struct usb_endpoint_descriptor *keyspan_get_in_endpoint(struct usb_host_interface *iface)
415 {
416
417         struct usb_endpoint_descriptor *endpoint;
418         int i;
419
420         for (i = 0; i < iface->desc.bNumEndpoints; ++i) {
421                 endpoint = &iface->endpoint[i].desc;
422
423                 if (usb_endpoint_is_int_in(endpoint)) {
424                         /* we found our interrupt in endpoint */
425                         return endpoint;
426                 }
427         }
428
429         return NULL;
430 }
431
432 /*
433  * Routine that sets up the driver to handle a specific USB device detected on the bus.
434  */
435 static int keyspan_probe(struct usb_interface *interface, const struct usb_device_id *id)
436 {
437         struct usb_device *udev = interface_to_usbdev(interface);
438         struct usb_endpoint_descriptor *endpoint;
439         struct usb_keyspan *remote;
440         struct input_dev *input_dev;
441         int i, retval;
442
443         endpoint = keyspan_get_in_endpoint(interface->cur_altsetting);
444         if (!endpoint)
445                 return -ENODEV;
446
447         remote = kzalloc(sizeof(*remote), GFP_KERNEL);
448         input_dev = input_allocate_device();
449         if (!remote || !input_dev) {
450                 retval = -ENOMEM;
451                 goto fail1;
452         }
453
454         remote->udev = udev;
455         remote->input = input_dev;
456         remote->interface = interface;
457         remote->in_endpoint = endpoint;
458         remote->toggle = -1;    /* Set to -1 so we will always not match the toggle from the first remote message. */
459
460         remote->in_buffer = usb_buffer_alloc(udev, RECV_SIZE, SLAB_ATOMIC, &remote->in_dma);
461         if (!remote->in_buffer) {
462                 retval = -ENOMEM;
463                 goto fail1;
464         }
465
466         remote->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
467         if (!remote->irq_urb) {
468                 retval = -ENOMEM;
469                 goto fail2;
470         }
471
472         retval = keyspan_setup(udev);
473         if (retval) {
474                 retval = -ENODEV;
475                 goto fail3;
476         }
477
478         if (udev->manufacturer)
479                 strlcpy(remote->name, udev->manufacturer, sizeof(remote->name));
480
481         if (udev->product) {
482                 if (udev->manufacturer)
483                         strlcat(remote->name, " ", sizeof(remote->name));
484                 strlcat(remote->name, udev->product, sizeof(remote->name));
485         }
486
487         if (!strlen(remote->name))
488                 snprintf(remote->name, sizeof(remote->name),
489                          "USB Keyspan Remote %04x:%04x",
490                          le16_to_cpu(udev->descriptor.idVendor),
491                          le16_to_cpu(udev->descriptor.idProduct));
492
493         usb_make_path(udev, remote->phys, sizeof(remote->phys));
494         strlcat(remote->phys, "/input0", sizeof(remote->phys));
495
496         input_dev->name = remote->name;
497         input_dev->phys = remote->phys;
498         usb_to_input_id(udev, &input_dev->id);
499         input_dev->cdev.dev = &interface->dev;
500
501         input_dev->evbit[0] = BIT(EV_KEY);              /* We will only report KEY events. */
502         for (i = 0; i < ARRAY_SIZE(keyspan_key_table); i++)
503                 if (keyspan_key_table[i] != KEY_RESERVED)
504                         set_bit(keyspan_key_table[i], input_dev->keybit);
505
506         input_dev->private = remote;
507         input_dev->open = keyspan_open;
508         input_dev->close = keyspan_close;
509
510         /*
511          * Initialize the URB to access the device. The urb gets sent to the device in keyspan_open()
512          */
513         usb_fill_int_urb(remote->irq_urb,
514                          remote->udev, usb_rcvintpipe(remote->udev, remote->in_endpoint->bEndpointAddress),
515                          remote->in_buffer, RECV_SIZE, keyspan_irq_recv, remote,
516                          remote->in_endpoint->bInterval);
517         remote->irq_urb->transfer_dma = remote->in_dma;
518         remote->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
519
520         /* we can register the device now, as it is ready */
521         input_register_device(remote->input);
522
523         /* save our data pointer in this interface device */
524         usb_set_intfdata(interface, remote);
525
526         return 0;
527
528  fail3: usb_free_urb(remote->irq_urb);
529  fail2: usb_buffer_free(udev, RECV_SIZE, remote->in_buffer, remote->in_dma);
530  fail1: kfree(remote);
531         input_free_device(input_dev);
532
533         return retval;
534 }
535
536 /*
537  * Routine called when a device is disconnected from the USB.
538  */
539 static void keyspan_disconnect(struct usb_interface *interface)
540 {
541         struct usb_keyspan *remote;
542
543         remote = usb_get_intfdata(interface);
544         usb_set_intfdata(interface, NULL);
545
546         if (remote) {   /* We have a valid driver structure so clean up everything we allocated. */
547                 input_unregister_device(remote->input);
548                 usb_kill_urb(remote->irq_urb);
549                 usb_free_urb(remote->irq_urb);
550                 usb_buffer_free(remote->udev, RECV_SIZE, remote->in_buffer, remote->in_dma);
551                 kfree(remote);
552         }
553 }
554
555 /*
556  * Standard driver set up sections
557  */
558 static struct usb_driver keyspan_driver =
559 {
560         .name =         "keyspan_remote",
561         .probe =        keyspan_probe,
562         .disconnect =   keyspan_disconnect,
563         .id_table =     keyspan_table
564 };
565
566 static int __init usb_keyspan_init(void)
567 {
568         int result;
569
570         /* register this driver with the USB subsystem */
571         result = usb_register(&keyspan_driver);
572         if (result)
573                 err("usb_register failed. Error number %d\n", result);
574
575         return result;
576 }
577
578 static void __exit usb_keyspan_exit(void)
579 {
580         /* deregister this driver with the USB subsystem */
581         usb_deregister(&keyspan_driver);
582 }
583
584 module_init(usb_keyspan_init);
585 module_exit(usb_keyspan_exit);
586
587 MODULE_DEVICE_TABLE(usb, keyspan_table);
588 MODULE_AUTHOR(DRIVER_AUTHOR);
589 MODULE_DESCRIPTION(DRIVER_DESC);
590 MODULE_LICENSE(DRIVER_LICENSE);