]> Pileus Git - ~andy/linux/blob - drivers/media/usb/em28xx/em28xx-input.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux...
[~andy/linux] / drivers / media / usb / em28xx / em28xx-input.c
1 /*
2   handle em28xx IR remotes via linux kernel input layer.
3
4    Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
5                       Markus Rechberger <mrechberger@gmail.com>
6                       Mauro Carvalho Chehab <mchehab@infradead.org>
7                       Sascha Sommer <saschasommer@freenet.de>
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   This program is distributed in the hope that it will be useful,
15   but WITHOUT ANY WARRANTY; without even the implied warranty of
16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17   GNU General Public License for more details.
18
19   You should have received a copy of the GNU General Public License
20   along with this program; if not, write to the Free Software
21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22  */
23
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
27 #include <linux/interrupt.h>
28 #include <linux/usb.h>
29 #include <linux/slab.h>
30
31 #include "em28xx.h"
32
33 #define EM28XX_SNAPSHOT_KEY KEY_CAMERA
34 #define EM28XX_SBUTTON_QUERY_INTERVAL 500
35 #define EM28XX_R0C_USBSUSP_SNAPSHOT 0x20
36
37 static unsigned int ir_debug;
38 module_param(ir_debug, int, 0644);
39 MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
40
41 #define MODULE_NAME "em28xx"
42
43 #define dprintk(fmt, arg...) \
44         if (ir_debug) { \
45                 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
46         }
47
48 /**********************************************************
49  Polling structure used by em28xx IR's
50  **********************************************************/
51
52 struct em28xx_ir_poll_result {
53         unsigned int toggle_bit:1;
54         unsigned int read_count:7;
55
56         u32 scancode;
57 };
58
59 struct em28xx_IR {
60         struct em28xx *dev;
61         struct rc_dev *rc;
62         char name[32];
63         char phys[32];
64
65         /* poll decoder */
66         int polling;
67         struct delayed_work work;
68         unsigned int full_code:1;
69         unsigned int last_readcount;
70         u64 rc_type;
71
72         /* i2c slave address of external device (if used) */
73         u16 i2c_dev_addr;
74
75         int  (*get_key_i2c)(struct i2c_client *, u32 *);
76         int  (*get_key)(struct em28xx_IR *, struct em28xx_ir_poll_result *);
77 };
78
79 /**********************************************************
80  I2C IR based get keycodes - should be used with ir-kbd-i2c
81  **********************************************************/
82
83 static int em28xx_get_key_terratec(struct i2c_client *i2c_dev, u32 *ir_key)
84 {
85         unsigned char b;
86
87         /* poll IR chip */
88         if (1 != i2c_master_recv(i2c_dev, &b, 1))
89                 return -EIO;
90
91         /* it seems that 0xFE indicates that a button is still hold
92            down, while 0xff indicates that no button is hold down. */
93
94         if (b == 0xff)
95                 return 0;
96
97         if (b == 0xfe)
98                 /* keep old data */
99                 return 1;
100
101         *ir_key = b;
102         return 1;
103 }
104
105 static int em28xx_get_key_em_haup(struct i2c_client *i2c_dev, u32 *ir_key)
106 {
107         unsigned char buf[2];
108         u16 code;
109         int size;
110
111         /* poll IR chip */
112         size = i2c_master_recv(i2c_dev, buf, sizeof(buf));
113
114         if (size != 2)
115                 return -EIO;
116
117         /* Does eliminate repeated parity code */
118         if (buf[1] == 0xff)
119                 return 0;
120
121         /*
122          * Rearranges bits to the right order.
123          * The bit order were determined experimentally by using
124          * The original Hauppauge Grey IR and another RC5 that uses addr=0x08
125          * The RC5 code has 14 bits, but we've experimentally determined
126          * the meaning for only 11 bits.
127          * So, the code translation is not complete. Yet, it is enough to
128          * work with the provided RC5 IR.
129          */
130         code =
131                  ((buf[0] & 0x01) ? 0x0020 : 0) | /*            0010 0000 */
132                  ((buf[0] & 0x02) ? 0x0010 : 0) | /*            0001 0000 */
133                  ((buf[0] & 0x04) ? 0x0008 : 0) | /*            0000 1000 */
134                  ((buf[0] & 0x08) ? 0x0004 : 0) | /*            0000 0100 */
135                  ((buf[0] & 0x10) ? 0x0002 : 0) | /*            0000 0010 */
136                  ((buf[0] & 0x20) ? 0x0001 : 0) | /*            0000 0001 */
137                  ((buf[1] & 0x08) ? 0x1000 : 0) | /* 0001 0000            */
138                  ((buf[1] & 0x10) ? 0x0800 : 0) | /* 0000 1000            */
139                  ((buf[1] & 0x20) ? 0x0400 : 0) | /* 0000 0100            */
140                  ((buf[1] & 0x40) ? 0x0200 : 0) | /* 0000 0010            */
141                  ((buf[1] & 0x80) ? 0x0100 : 0);  /* 0000 0001            */
142
143         /* return key */
144         *ir_key = code;
145         return 1;
146 }
147
148 static int em28xx_get_key_pinnacle_usb_grey(struct i2c_client *i2c_dev,
149                                             u32 *ir_key)
150 {
151         unsigned char buf[3];
152
153         /* poll IR chip */
154
155         if (3 != i2c_master_recv(i2c_dev, buf, 3))
156                 return -EIO;
157
158         if (buf[0] != 0x00)
159                 return 0;
160
161         *ir_key = buf[2]&0x3f;
162
163         return 1;
164 }
165
166 static int em28xx_get_key_winfast_usbii_deluxe(struct i2c_client *i2c_dev,
167                                                u32 *ir_key)
168 {
169         unsigned char subaddr, keydetect, key;
170
171         struct i2c_msg msg[] = { { .addr = i2c_dev->addr, .flags = 0, .buf = &subaddr, .len = 1},
172                                  { .addr = i2c_dev->addr, .flags = I2C_M_RD, .buf = &keydetect, .len = 1} };
173
174         subaddr = 0x10;
175         if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
176                 return -EIO;
177         if (keydetect == 0x00)
178                 return 0;
179
180         subaddr = 0x00;
181         msg[1].buf = &key;
182         if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
183                 return -EIO;
184         if (key == 0x00)
185                 return 0;
186
187         *ir_key = key;
188         return 1;
189 }
190
191 /**********************************************************
192  Poll based get keycode functions
193  **********************************************************/
194
195 /* This is for the em2860/em2880 */
196 static int default_polling_getkey(struct em28xx_IR *ir,
197                                   struct em28xx_ir_poll_result *poll_result)
198 {
199         struct em28xx *dev = ir->dev;
200         int rc;
201         u8 msg[3] = { 0, 0, 0 };
202
203         /* Read key toggle, brand, and key code
204            on registers 0x45, 0x46 and 0x47
205          */
206         rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
207                                           msg, sizeof(msg));
208         if (rc < 0)
209                 return rc;
210
211         /* Infrared toggle (Reg 0x45[7]) */
212         poll_result->toggle_bit = (msg[0] >> 7);
213
214         /* Infrared read count (Reg 0x45[6:0] */
215         poll_result->read_count = (msg[0] & 0x7f);
216
217         /* Remote Control Address/Data (Regs 0x46/0x47) */
218         poll_result->scancode = msg[1] << 8 | msg[2];
219
220         return 0;
221 }
222
223 static int em2874_polling_getkey(struct em28xx_IR *ir,
224                                  struct em28xx_ir_poll_result *poll_result)
225 {
226         struct em28xx *dev = ir->dev;
227         int rc;
228         u8 msg[5] = { 0, 0, 0, 0, 0 };
229
230         /* Read key toggle, brand, and key code
231            on registers 0x51-55
232          */
233         rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
234                                           msg, sizeof(msg));
235         if (rc < 0)
236                 return rc;
237
238         /* Infrared toggle (Reg 0x51[7]) */
239         poll_result->toggle_bit = (msg[0] >> 7);
240
241         /* Infrared read count (Reg 0x51[6:0] */
242         poll_result->read_count = (msg[0] & 0x7f);
243
244         /*
245          * Remote Control Address (Reg 0x52)
246          * Remote Control Data (Reg 0x53-0x55)
247          */
248         switch (ir->rc_type) {
249         case RC_BIT_RC5:
250                 poll_result->scancode = msg[1] << 8 | msg[2];
251                 break;
252         case RC_BIT_NEC:
253                 if ((msg[3] ^ msg[4]) != 0xff)          /* 32 bits NEC */
254                         poll_result->scancode = (msg[1] << 24) |
255                                                 (msg[2] << 16) |
256                                                 (msg[3] << 8)  |
257                                                  msg[4];
258                 else if ((msg[1] ^ msg[2]) != 0xff)     /* 24 bits NEC */
259                         poll_result->scancode = (msg[1] << 16) |
260                                                 (msg[2] << 8)  |
261                                                  msg[3];
262                 else                                    /* Normal NEC */
263                         poll_result->scancode = msg[1] << 8 | msg[3];
264                 break;
265         case RC_BIT_RC6_0:
266                 poll_result->scancode = msg[1] << 8 | msg[2];
267                 break;
268         default:
269                 poll_result->scancode = (msg[1] << 24) | (msg[2] << 16) |
270                                         (msg[3] << 8)  | msg[4];
271                 break;
272         }
273
274         return 0;
275 }
276
277 /**********************************************************
278  Polling code for em28xx
279  **********************************************************/
280
281 static int em28xx_i2c_ir_handle_key(struct em28xx_IR *ir)
282 {
283         static u32 ir_key;
284         int rc;
285         struct i2c_client client;
286
287         client.adapter = &ir->dev->i2c_adap;
288         client.addr = ir->i2c_dev_addr;
289
290         rc = ir->get_key_i2c(&client, &ir_key);
291         if (rc < 0) {
292                 dprintk("ir->get_key_i2c() failed: %d\n", rc);
293                 return rc;
294         }
295
296         if (rc) {
297                 dprintk("%s: keycode = 0x%04x\n", __func__, ir_key);
298                 rc_keydown(ir->rc, ir_key, 0);
299         }
300         return 0;
301 }
302
303 static void em28xx_ir_handle_key(struct em28xx_IR *ir)
304 {
305         int result;
306         struct em28xx_ir_poll_result poll_result;
307
308         /* read the registers containing the IR status */
309         result = ir->get_key(ir, &poll_result);
310         if (unlikely(result < 0)) {
311                 dprintk("ir->get_key() failed: %d\n", result);
312                 return;
313         }
314
315         if (unlikely(poll_result.read_count != ir->last_readcount)) {
316                 dprintk("%s: toggle: %d, count: %d, key 0x%04x\n", __func__,
317                         poll_result.toggle_bit, poll_result.read_count,
318                         poll_result.scancode);
319                 if (ir->full_code)
320                         rc_keydown(ir->rc,
321                                    poll_result.scancode,
322                                    poll_result.toggle_bit);
323                 else
324                         rc_keydown(ir->rc,
325                                    poll_result.scancode & 0xff,
326                                    poll_result.toggle_bit);
327
328                 if (ir->dev->chip_id == CHIP_ID_EM2874 ||
329                     ir->dev->chip_id == CHIP_ID_EM2884)
330                         /* The em2874 clears the readcount field every time the
331                            register is read.  The em2860/2880 datasheet says that it
332                            is supposed to clear the readcount, but it doesn't.  So with
333                            the em2874, we are looking for a non-zero read count as
334                            opposed to a readcount that is incrementing */
335                         ir->last_readcount = 0;
336                 else
337                         ir->last_readcount = poll_result.read_count;
338         }
339 }
340
341 static void em28xx_ir_work(struct work_struct *work)
342 {
343         struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);
344
345         if (ir->i2c_dev_addr) /* external i2c device */
346                 em28xx_i2c_ir_handle_key(ir);
347         else /* internal device */
348                 em28xx_ir_handle_key(ir);
349         schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
350 }
351
352 static int em28xx_ir_start(struct rc_dev *rc)
353 {
354         struct em28xx_IR *ir = rc->priv;
355
356         INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
357         schedule_delayed_work(&ir->work, 0);
358
359         return 0;
360 }
361
362 static void em28xx_ir_stop(struct rc_dev *rc)
363 {
364         struct em28xx_IR *ir = rc->priv;
365
366         cancel_delayed_work_sync(&ir->work);
367 }
368
369 static int em2860_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
370 {
371         struct em28xx_IR *ir = rc_dev->priv;
372         struct em28xx *dev = ir->dev;
373
374         /* Adjust xclk based on IR table for RC5/NEC tables */
375         if (*rc_type & RC_BIT_RC5) {
376                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
377                 ir->full_code = 1;
378                 *rc_type = RC_BIT_RC5;
379         } else if (*rc_type & RC_BIT_NEC) {
380                 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
381                 ir->full_code = 1;
382                 *rc_type = RC_BIT_NEC;
383         } else if (*rc_type & RC_BIT_UNKNOWN) {
384                 *rc_type = RC_BIT_UNKNOWN;
385         } else {
386                 *rc_type = ir->rc_type;
387                 return -EINVAL;
388         }
389         em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
390                               EM28XX_XCLK_IR_RC5_MODE);
391
392         ir->rc_type = *rc_type;
393
394         return 0;
395 }
396
397 static int em2874_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
398 {
399         struct em28xx_IR *ir = rc_dev->priv;
400         struct em28xx *dev = ir->dev;
401         u8 ir_config = EM2874_IR_RC5;
402
403         /* Adjust xclk and set type based on IR table for RC5/NEC/RC6 tables */
404         if (*rc_type & RC_BIT_RC5) {
405                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
406                 ir->full_code = 1;
407                 *rc_type = RC_BIT_RC5;
408         } else if (*rc_type & RC_BIT_NEC) {
409                 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
410                 ir_config = EM2874_IR_NEC | EM2874_IR_NEC_NO_PARITY;
411                 ir->full_code = 1;
412                 *rc_type = RC_BIT_NEC;
413         } else if (*rc_type & RC_BIT_RC6_0) {
414                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
415                 ir_config = EM2874_IR_RC6_MODE_0;
416                 ir->full_code = 1;
417                 *rc_type = RC_BIT_RC6_0;
418         } else if (*rc_type & RC_BIT_UNKNOWN) {
419                 *rc_type = RC_BIT_UNKNOWN;
420         } else {
421                 *rc_type = ir->rc_type;
422                 return -EINVAL;
423         }
424         em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
425         em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
426                               EM28XX_XCLK_IR_RC5_MODE);
427
428         ir->rc_type = *rc_type;
429
430         return 0;
431 }
432 static int em28xx_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
433 {
434         struct em28xx_IR *ir = rc_dev->priv;
435         struct em28xx *dev = ir->dev;
436
437         /* Setup the proper handler based on the chip */
438         switch (dev->chip_id) {
439         case CHIP_ID_EM2860:
440         case CHIP_ID_EM2883:
441                 return em2860_ir_change_protocol(rc_dev, rc_type);
442         case CHIP_ID_EM2884:
443         case CHIP_ID_EM2874:
444         case CHIP_ID_EM28174:
445                 return em2874_ir_change_protocol(rc_dev, rc_type);
446         default:
447                 printk("Unrecognized em28xx chip id 0x%02x: IR not supported\n",
448                         dev->chip_id);
449                 return -EINVAL;
450         }
451 }
452
453 static int em28xx_probe_i2c_ir(struct em28xx *dev)
454 {
455         int i = 0;
456         /* Leadtek winfast tv USBII deluxe can find a non working IR-device */
457         /* at address 0x18, so if that address is needed for another board in */
458         /* the future, please put it after 0x1f. */
459         const unsigned short addr_list[] = {
460                  0x1f, 0x30, 0x47, I2C_CLIENT_END
461         };
462
463         while (addr_list[i] != I2C_CLIENT_END) {
464                 if (i2c_probe_func_quick_read(&dev->i2c_adap, addr_list[i]) == 1)
465                         return addr_list[i];
466                 i++;
467         }
468
469         return -ENODEV;
470 }
471
472 /**********************************************************
473  Handle Webcam snapshot button
474  **********************************************************/
475
476 static void em28xx_query_sbutton(struct work_struct *work)
477 {
478         /* Poll the register and see if the button is depressed */
479         struct em28xx *dev =
480                 container_of(work, struct em28xx, sbutton_query_work.work);
481         int ret;
482
483         ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP);
484
485         if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) {
486                 u8 cleared;
487                 /* Button is depressed, clear the register */
488                 cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT;
489                 em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1);
490
491                 /* Not emulate the keypress */
492                 input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
493                                  1);
494                 /* Now unpress the key */
495                 input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
496                                  0);
497         }
498
499         /* Schedule next poll */
500         schedule_delayed_work(&dev->sbutton_query_work,
501                               msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
502 }
503
504 static void em28xx_register_snapshot_button(struct em28xx *dev)
505 {
506         struct input_dev *input_dev;
507         int err;
508
509         em28xx_info("Registering snapshot button...\n");
510         input_dev = input_allocate_device();
511         if (!input_dev) {
512                 em28xx_errdev("input_allocate_device failed\n");
513                 return;
514         }
515
516         usb_make_path(dev->udev, dev->snapshot_button_path,
517                       sizeof(dev->snapshot_button_path));
518         strlcat(dev->snapshot_button_path, "/sbutton",
519                 sizeof(dev->snapshot_button_path));
520         INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton);
521
522         input_dev->name = "em28xx snapshot button";
523         input_dev->phys = dev->snapshot_button_path;
524         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
525         set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
526         input_dev->keycodesize = 0;
527         input_dev->keycodemax = 0;
528         input_dev->id.bustype = BUS_USB;
529         input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
530         input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
531         input_dev->id.version = 1;
532         input_dev->dev.parent = &dev->udev->dev;
533
534         err = input_register_device(input_dev);
535         if (err) {
536                 em28xx_errdev("input_register_device failed\n");
537                 input_free_device(input_dev);
538                 return;
539         }
540
541         dev->sbutton_input_dev = input_dev;
542         schedule_delayed_work(&dev->sbutton_query_work,
543                               msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
544         return;
545
546 }
547
548 static void em28xx_deregister_snapshot_button(struct em28xx *dev)
549 {
550         if (dev->sbutton_input_dev != NULL) {
551                 em28xx_info("Deregistering snapshot button\n");
552                 cancel_delayed_work_sync(&dev->sbutton_query_work);
553                 input_unregister_device(dev->sbutton_input_dev);
554                 dev->sbutton_input_dev = NULL;
555         }
556         return;
557 }
558
559 static int em28xx_ir_init(struct em28xx *dev)
560 {
561         struct em28xx_IR *ir;
562         struct rc_dev *rc;
563         int err = -ENOMEM;
564         u64 rc_type;
565         u16 i2c_rc_dev_addr = 0;
566
567         if (dev->board.has_snapshot_button)
568                 em28xx_register_snapshot_button(dev);
569
570         if (dev->board.has_ir_i2c) {
571                 i2c_rc_dev_addr = em28xx_probe_i2c_ir(dev);
572                 if (!i2c_rc_dev_addr) {
573                         dev->board.has_ir_i2c = 0;
574                         em28xx_warn("No i2c IR remote control device found.\n");
575                         return -ENODEV;
576                 }
577         }
578
579         if (dev->board.ir_codes == NULL && !dev->board.has_ir_i2c) {
580                 /* No remote control support */
581                 em28xx_warn("Remote control support is not available for "
582                                 "this card.\n");
583                 return 0;
584         }
585
586         ir = kzalloc(sizeof(*ir), GFP_KERNEL);
587         rc = rc_allocate_device();
588         if (!ir || !rc)
589                 goto error;
590
591         /* record handles to ourself */
592         ir->dev = dev;
593         dev->ir = ir;
594         ir->rc = rc;
595
596         rc->priv = ir;
597         rc->open = em28xx_ir_start;
598         rc->close = em28xx_ir_stop;
599
600         if (dev->board.has_ir_i2c) {    /* external i2c device */
601                 switch (dev->model) {
602                 case EM2800_BOARD_TERRATEC_CINERGY_200:
603                 case EM2820_BOARD_TERRATEC_CINERGY_250:
604                         rc->map_name = RC_MAP_EM_TERRATEC;
605                         ir->get_key_i2c = em28xx_get_key_terratec;
606                         break;
607                 case EM2820_BOARD_PINNACLE_USB_2:
608                         rc->map_name = RC_MAP_PINNACLE_GREY;
609                         ir->get_key_i2c = em28xx_get_key_pinnacle_usb_grey;
610                         break;
611                 case EM2820_BOARD_HAUPPAUGE_WINTV_USB_2:
612                         rc->map_name = RC_MAP_HAUPPAUGE;
613                         ir->get_key_i2c = em28xx_get_key_em_haup;
614                         rc->allowed_protos = RC_BIT_RC5;
615                         break;
616                 case EM2820_BOARD_LEADTEK_WINFAST_USBII_DELUXE:
617                         rc->map_name = RC_MAP_WINFAST_USBII_DELUXE;
618                         ir->get_key_i2c = em28xx_get_key_winfast_usbii_deluxe;
619                         break;
620                 default:
621                         err = -ENODEV;
622                         goto error;
623                 }
624
625                 ir->i2c_dev_addr = i2c_rc_dev_addr;
626         } else {        /* internal device */
627                 switch (dev->chip_id) {
628                 case CHIP_ID_EM2860:
629                 case CHIP_ID_EM2883:
630                         rc->allowed_protos = RC_BIT_RC5 | RC_BIT_NEC;
631                         ir->get_key = default_polling_getkey;
632                         break;
633                 case CHIP_ID_EM2884:
634                 case CHIP_ID_EM2874:
635                 case CHIP_ID_EM28174:
636                         ir->get_key = em2874_polling_getkey;
637                         rc->allowed_protos = RC_BIT_RC5 | RC_BIT_NEC |
638                                              RC_BIT_RC6_0;
639                         break;
640                 default:
641                         err = -ENODEV;
642                         goto error;
643                 }
644
645                 rc->change_protocol = em28xx_ir_change_protocol;
646                 rc->map_name = dev->board.ir_codes;
647
648                 /* By default, keep protocol field untouched */
649                 rc_type = RC_BIT_UNKNOWN;
650                 err = em28xx_ir_change_protocol(rc, &rc_type);
651                 if (err)
652                         goto error;
653         }
654
655         /* This is how often we ask the chip for IR information */
656         ir->polling = 100; /* ms */
657
658         /* init input device */
659         snprintf(ir->name, sizeof(ir->name), "em28xx IR (%s)", dev->name);
660
661         usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
662         strlcat(ir->phys, "/input0", sizeof(ir->phys));
663
664         rc->input_name = ir->name;
665         rc->input_phys = ir->phys;
666         rc->input_id.bustype = BUS_USB;
667         rc->input_id.version = 1;
668         rc->input_id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
669         rc->input_id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
670         rc->dev.parent = &dev->udev->dev;
671         rc->driver_name = MODULE_NAME;
672
673         /* all done */
674         err = rc_register_device(rc);
675         if (err)
676                 goto error;
677
678         return 0;
679
680 error:
681         dev->ir = NULL;
682         rc_free_device(rc);
683         kfree(ir);
684         return err;
685 }
686
687 static int em28xx_ir_fini(struct em28xx *dev)
688 {
689         struct em28xx_IR *ir = dev->ir;
690
691         em28xx_deregister_snapshot_button(dev);
692
693         /* skip detach on non attached boards */
694         if (!ir)
695                 return 0;
696
697         if (ir->rc)
698                 rc_unregister_device(ir->rc);
699
700         /* done */
701         kfree(ir);
702         dev->ir = NULL;
703         return 0;
704 }
705
706 static struct em28xx_ops rc_ops = {
707         .id   = EM28XX_RC,
708         .name = "Em28xx Input Extension",
709         .init = em28xx_ir_init,
710         .fini = em28xx_ir_fini,
711 };
712
713 static int __init em28xx_rc_register(void)
714 {
715         return em28xx_register_extension(&rc_ops);
716 }
717
718 static void __exit em28xx_rc_unregister(void)
719 {
720         em28xx_unregister_extension(&rc_ops);
721 }
722
723 MODULE_LICENSE("GPL");
724 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
725 MODULE_DESCRIPTION("Em28xx Input driver");
726
727 module_init(em28xx_rc_register);
728 module_exit(em28xx_rc_unregister);