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[media] em28xx: reduce the polling interval for GPI connected buttons
[deliverable/linux.git] / drivers / media / usb / em28xx / em28xx-input.c
... / ...
CommitLineData
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_BUTTONS_DEBOUNCED_QUERY_INTERVAL 500 /* [ms] */
35#define EM28XX_BUTTONS_VOLATILE_QUERY_INTERVAL 100 /* [ms] */
36
37static unsigned int ir_debug;
38module_param(ir_debug, int, 0644);
39MODULE_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
52struct em28xx_ir_poll_result {
53 unsigned int toggle_bit:1;
54 unsigned int read_count:7;
55
56 u32 scancode;
57};
58
59struct 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
83static 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
105static 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
148static 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
166static 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 */
196static 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
223static 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
281static int em28xx_i2c_ir_handle_key(struct em28xx_IR *ir)
282{
283 struct em28xx *dev = ir->dev;
284 static u32 ir_key;
285 int rc;
286 struct i2c_client client;
287
288 client.adapter = &ir->dev->i2c_adap[dev->def_i2c_bus];
289 client.addr = ir->i2c_dev_addr;
290
291 rc = ir->get_key_i2c(&client, &ir_key);
292 if (rc < 0) {
293 dprintk("ir->get_key_i2c() failed: %d\n", rc);
294 return rc;
295 }
296
297 if (rc) {
298 dprintk("%s: keycode = 0x%04x\n", __func__, ir_key);
299 rc_keydown(ir->rc, ir_key, 0);
300 }
301 return 0;
302}
303
304static void em28xx_ir_handle_key(struct em28xx_IR *ir)
305{
306 int result;
307 struct em28xx_ir_poll_result poll_result;
308
309 /* read the registers containing the IR status */
310 result = ir->get_key(ir, &poll_result);
311 if (unlikely(result < 0)) {
312 dprintk("ir->get_key() failed: %d\n", result);
313 return;
314 }
315
316 if (unlikely(poll_result.read_count != ir->last_readcount)) {
317 dprintk("%s: toggle: %d, count: %d, key 0x%04x\n", __func__,
318 poll_result.toggle_bit, poll_result.read_count,
319 poll_result.scancode);
320 if (ir->full_code)
321 rc_keydown(ir->rc,
322 poll_result.scancode,
323 poll_result.toggle_bit);
324 else
325 rc_keydown(ir->rc,
326 poll_result.scancode & 0xff,
327 poll_result.toggle_bit);
328
329 if (ir->dev->chip_id == CHIP_ID_EM2874 ||
330 ir->dev->chip_id == CHIP_ID_EM2884)
331 /* The em2874 clears the readcount field every time the
332 register is read. The em2860/2880 datasheet says that it
333 is supposed to clear the readcount, but it doesn't. So with
334 the em2874, we are looking for a non-zero read count as
335 opposed to a readcount that is incrementing */
336 ir->last_readcount = 0;
337 else
338 ir->last_readcount = poll_result.read_count;
339 }
340}
341
342static void em28xx_ir_work(struct work_struct *work)
343{
344 struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);
345
346 if (ir->i2c_dev_addr) /* external i2c device */
347 em28xx_i2c_ir_handle_key(ir);
348 else /* internal device */
349 em28xx_ir_handle_key(ir);
350 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
351}
352
353static int em28xx_ir_start(struct rc_dev *rc)
354{
355 struct em28xx_IR *ir = rc->priv;
356
357 INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
358 schedule_delayed_work(&ir->work, 0);
359
360 return 0;
361}
362
363static void em28xx_ir_stop(struct rc_dev *rc)
364{
365 struct em28xx_IR *ir = rc->priv;
366
367 cancel_delayed_work_sync(&ir->work);
368}
369
370static int em2860_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
371{
372 struct em28xx_IR *ir = rc_dev->priv;
373 struct em28xx *dev = ir->dev;
374
375 /* Adjust xclk based on IR table for RC5/NEC tables */
376 if (*rc_type & RC_BIT_RC5) {
377 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
378 ir->full_code = 1;
379 *rc_type = RC_BIT_RC5;
380 } else if (*rc_type & RC_BIT_NEC) {
381 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
382 ir->full_code = 1;
383 *rc_type = RC_BIT_NEC;
384 } else if (*rc_type & RC_BIT_UNKNOWN) {
385 *rc_type = RC_BIT_UNKNOWN;
386 } else {
387 *rc_type = ir->rc_type;
388 return -EINVAL;
389 }
390 em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
391 EM28XX_XCLK_IR_RC5_MODE);
392
393 ir->rc_type = *rc_type;
394
395 return 0;
396}
397
398static int em2874_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
399{
400 struct em28xx_IR *ir = rc_dev->priv;
401 struct em28xx *dev = ir->dev;
402 u8 ir_config = EM2874_IR_RC5;
403
404 /* Adjust xclk and set type based on IR table for RC5/NEC/RC6 tables */
405 if (*rc_type & RC_BIT_RC5) {
406 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
407 ir->full_code = 1;
408 *rc_type = RC_BIT_RC5;
409 } else if (*rc_type & RC_BIT_NEC) {
410 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
411 ir_config = EM2874_IR_NEC | EM2874_IR_NEC_NO_PARITY;
412 ir->full_code = 1;
413 *rc_type = RC_BIT_NEC;
414 } else if (*rc_type & RC_BIT_RC6_0) {
415 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
416 ir_config = EM2874_IR_RC6_MODE_0;
417 ir->full_code = 1;
418 *rc_type = RC_BIT_RC6_0;
419 } else if (*rc_type & RC_BIT_UNKNOWN) {
420 *rc_type = RC_BIT_UNKNOWN;
421 } else {
422 *rc_type = ir->rc_type;
423 return -EINVAL;
424 }
425 em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
426 em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
427 EM28XX_XCLK_IR_RC5_MODE);
428
429 ir->rc_type = *rc_type;
430
431 return 0;
432}
433static int em28xx_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
434{
435 struct em28xx_IR *ir = rc_dev->priv;
436 struct em28xx *dev = ir->dev;
437
438 /* Setup the proper handler based on the chip */
439 switch (dev->chip_id) {
440 case CHIP_ID_EM2860:
441 case CHIP_ID_EM2883:
442 return em2860_ir_change_protocol(rc_dev, rc_type);
443 case CHIP_ID_EM2884:
444 case CHIP_ID_EM2874:
445 case CHIP_ID_EM28174:
446 case CHIP_ID_EM28178:
447 return em2874_ir_change_protocol(rc_dev, rc_type);
448 default:
449 printk("Unrecognized em28xx chip id 0x%02x: IR not supported\n",
450 dev->chip_id);
451 return -EINVAL;
452 }
453}
454
455static int em28xx_probe_i2c_ir(struct em28xx *dev)
456{
457 int i = 0;
458 /* Leadtek winfast tv USBII deluxe can find a non working IR-device */
459 /* at address 0x18, so if that address is needed for another board in */
460 /* the future, please put it after 0x1f. */
461 const unsigned short addr_list[] = {
462 0x1f, 0x30, 0x47, I2C_CLIENT_END
463 };
464
465 while (addr_list[i] != I2C_CLIENT_END) {
466 if (i2c_probe_func_quick_read(&dev->i2c_adap[dev->def_i2c_bus], addr_list[i]) == 1)
467 return addr_list[i];
468 i++;
469 }
470
471 return -ENODEV;
472}
473
474/**********************************************************
475 Handle buttons
476 **********************************************************/
477
478static void em28xx_query_buttons(struct work_struct *work)
479{
480 struct em28xx *dev =
481 container_of(work, struct em28xx, buttons_query_work.work);
482 u8 i, j;
483 int regval;
484 bool is_pressed, was_pressed;
485 const struct em28xx_led *led;
486
487 /* Poll and evaluate all addresses */
488 for (i = 0; i < dev->num_button_polling_addresses; i++) {
489 /* Read value from register */
490 regval = em28xx_read_reg(dev, dev->button_polling_addresses[i]);
491 if (regval < 0)
492 continue;
493 /* Check states of the buttons and act */
494 j = 0;
495 while (dev->board.buttons[j].role >= 0 &&
496 dev->board.buttons[j].role < EM28XX_NUM_BUTTON_ROLES) {
497 struct em28xx_button *button = &dev->board.buttons[j];
498 /* Check if button uses the current address */
499 if (button->reg_r != dev->button_polling_addresses[i]) {
500 j++;
501 continue;
502 }
503 /* Determine if button is and was pressed last time */
504 is_pressed = regval & button->mask;
505 was_pressed = dev->button_polling_last_values[i]
506 & button->mask;
507 if (button->inverted) {
508 is_pressed = !is_pressed;
509 was_pressed = !was_pressed;
510 }
511 /* Clear button state (if needed) */
512 if (is_pressed && button->reg_clearing)
513 em28xx_write_reg(dev, button->reg_clearing,
514 (~regval & button->mask)
515 | (regval & ~button->mask));
516 /* Handle button state */
517 if (!is_pressed || was_pressed) {
518 j++;
519 continue;
520 }
521 switch (button->role) {
522 case EM28XX_BUTTON_SNAPSHOT:
523 /* Emulate the keypress */
524 input_report_key(dev->sbutton_input_dev,
525 EM28XX_SNAPSHOT_KEY, 1);
526 /* Unpress the key */
527 input_report_key(dev->sbutton_input_dev,
528 EM28XX_SNAPSHOT_KEY, 0);
529 break;
530 case EM28XX_BUTTON_ILLUMINATION:
531 led = em28xx_find_led(dev,
532 EM28XX_LED_ILLUMINATION);
533 /* Switch illumination LED on/off */
534 if (led)
535 em28xx_toggle_reg_bits(dev,
536 led->gpio_reg,
537 led->gpio_mask);
538 break;
539 default:
540 WARN_ONCE(1, "BUG: unhandled button role.");
541 }
542 /* Next button */
543 j++;
544 }
545 /* Save current value for comparison during the next polling */
546 dev->button_polling_last_values[i] = regval;
547 }
548 /* Schedule next poll */
549 schedule_delayed_work(&dev->buttons_query_work,
550 msecs_to_jiffies(dev->button_polling_interval));
551}
552
553static int em28xx_register_snapshot_button(struct em28xx *dev)
554{
555 struct input_dev *input_dev;
556 int err;
557
558 em28xx_info("Registering snapshot button...\n");
559 input_dev = input_allocate_device();
560 if (!input_dev) {
561 em28xx_errdev("input_allocate_device failed\n");
562 return -ENOMEM;
563 }
564
565 usb_make_path(dev->udev, dev->snapshot_button_path,
566 sizeof(dev->snapshot_button_path));
567 strlcat(dev->snapshot_button_path, "/sbutton",
568 sizeof(dev->snapshot_button_path));
569
570 input_dev->name = "em28xx snapshot button";
571 input_dev->phys = dev->snapshot_button_path;
572 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
573 set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
574 input_dev->keycodesize = 0;
575 input_dev->keycodemax = 0;
576 input_dev->id.bustype = BUS_USB;
577 input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
578 input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
579 input_dev->id.version = 1;
580 input_dev->dev.parent = &dev->udev->dev;
581
582 err = input_register_device(input_dev);
583 if (err) {
584 em28xx_errdev("input_register_device failed\n");
585 input_free_device(input_dev);
586 return err;
587 }
588
589 dev->sbutton_input_dev = input_dev;
590 return 0;
591}
592
593static void em28xx_init_buttons(struct em28xx *dev)
594{
595 u8 i = 0, j = 0;
596 bool addr_new = 0;
597
598 dev->button_polling_interval = EM28XX_BUTTONS_DEBOUNCED_QUERY_INTERVAL;
599 while (dev->board.buttons[i].role >= 0 &&
600 dev->board.buttons[i].role < EM28XX_NUM_BUTTON_ROLES) {
601 struct em28xx_button *button = &dev->board.buttons[i];
602 /* Check if polling address is already on the list */
603 addr_new = 1;
604 for (j = 0; j < dev->num_button_polling_addresses; j++) {
605 if (button->reg_r == dev->button_polling_addresses[j]) {
606 addr_new = 0;
607 break;
608 }
609 }
610 /* Check if max. number of polling addresses is exceeded */
611 if (addr_new && dev->num_button_polling_addresses
612 >= EM28XX_NUM_BUTTON_ADDRESSES_MAX) {
613 WARN_ONCE(1, "BUG: maximum number of button polling addresses exceeded.");
614 goto next_button;
615 }
616 /* Button role specific checks and actions */
617 if (button->role == EM28XX_BUTTON_SNAPSHOT) {
618 /* Register input device */
619 if (em28xx_register_snapshot_button(dev) < 0)
620 goto next_button;
621 } else if (button->role == EM28XX_BUTTON_ILLUMINATION) {
622 /* Check sanity */
623 if (!em28xx_find_led(dev, EM28XX_LED_ILLUMINATION)) {
624 em28xx_errdev("BUG: illumination button defined, but no illumination LED.\n");
625 goto next_button;
626 }
627 }
628 /* Add read address to list of polling addresses */
629 if (addr_new) {
630 unsigned int index = dev->num_button_polling_addresses;
631 dev->button_polling_addresses[index] = button->reg_r;
632 dev->num_button_polling_addresses++;
633 }
634 /* Reduce polling interval if necessary */
635 if (!button->reg_clearing)
636 dev->button_polling_interval =
637 EM28XX_BUTTONS_VOLATILE_QUERY_INTERVAL;
638next_button:
639 /* Next button */
640 i++;
641 }
642
643 /* Start polling */
644 if (dev->num_button_polling_addresses) {
645 memset(dev->button_polling_last_values, 0,
646 EM28XX_NUM_BUTTON_ADDRESSES_MAX);
647 INIT_DELAYED_WORK(&dev->buttons_query_work,
648 em28xx_query_buttons);
649 schedule_delayed_work(&dev->buttons_query_work,
650 msecs_to_jiffies(dev->button_polling_interval));
651 }
652}
653
654static void em28xx_shutdown_buttons(struct em28xx *dev)
655{
656 /* Cancel polling */
657 cancel_delayed_work_sync(&dev->buttons_query_work);
658 /* Clear polling addresses list */
659 dev->num_button_polling_addresses = 0;
660 /* Deregister input devices */
661 if (dev->sbutton_input_dev != NULL) {
662 em28xx_info("Deregistering snapshot button\n");
663 input_unregister_device(dev->sbutton_input_dev);
664 dev->sbutton_input_dev = NULL;
665 }
666}
667
668static int em28xx_ir_init(struct em28xx *dev)
669{
670 struct em28xx_IR *ir;
671 struct rc_dev *rc;
672 int err = -ENOMEM;
673 u64 rc_type;
674 u16 i2c_rc_dev_addr = 0;
675
676 if (dev->board.buttons)
677 em28xx_init_buttons(dev);
678
679 if (dev->board.has_ir_i2c) {
680 i2c_rc_dev_addr = em28xx_probe_i2c_ir(dev);
681 if (!i2c_rc_dev_addr) {
682 dev->board.has_ir_i2c = 0;
683 em28xx_warn("No i2c IR remote control device found.\n");
684 return -ENODEV;
685 }
686 }
687
688 if (dev->board.ir_codes == NULL && !dev->board.has_ir_i2c) {
689 /* No remote control support */
690 em28xx_warn("Remote control support is not available for "
691 "this card.\n");
692 return 0;
693 }
694
695 ir = kzalloc(sizeof(*ir), GFP_KERNEL);
696 rc = rc_allocate_device();
697 if (!ir || !rc)
698 goto error;
699
700 /* record handles to ourself */
701 ir->dev = dev;
702 dev->ir = ir;
703 ir->rc = rc;
704
705 rc->priv = ir;
706 rc->open = em28xx_ir_start;
707 rc->close = em28xx_ir_stop;
708
709 if (dev->board.has_ir_i2c) { /* external i2c device */
710 switch (dev->model) {
711 case EM2800_BOARD_TERRATEC_CINERGY_200:
712 case EM2820_BOARD_TERRATEC_CINERGY_250:
713 rc->map_name = RC_MAP_EM_TERRATEC;
714 ir->get_key_i2c = em28xx_get_key_terratec;
715 break;
716 case EM2820_BOARD_PINNACLE_USB_2:
717 rc->map_name = RC_MAP_PINNACLE_GREY;
718 ir->get_key_i2c = em28xx_get_key_pinnacle_usb_grey;
719 break;
720 case EM2820_BOARD_HAUPPAUGE_WINTV_USB_2:
721 rc->map_name = RC_MAP_HAUPPAUGE;
722 ir->get_key_i2c = em28xx_get_key_em_haup;
723 rc->allowed_protos = RC_BIT_RC5;
724 break;
725 case EM2820_BOARD_LEADTEK_WINFAST_USBII_DELUXE:
726 rc->map_name = RC_MAP_WINFAST_USBII_DELUXE;
727 ir->get_key_i2c = em28xx_get_key_winfast_usbii_deluxe;
728 break;
729 default:
730 err = -ENODEV;
731 goto error;
732 }
733
734 ir->i2c_dev_addr = i2c_rc_dev_addr;
735 } else { /* internal device */
736 switch (dev->chip_id) {
737 case CHIP_ID_EM2860:
738 case CHIP_ID_EM2883:
739 rc->allowed_protos = RC_BIT_RC5 | RC_BIT_NEC;
740 ir->get_key = default_polling_getkey;
741 break;
742 case CHIP_ID_EM2884:
743 case CHIP_ID_EM2874:
744 case CHIP_ID_EM28174:
745 case CHIP_ID_EM28178:
746 ir->get_key = em2874_polling_getkey;
747 rc->allowed_protos = RC_BIT_RC5 | RC_BIT_NEC |
748 RC_BIT_RC6_0;
749 break;
750 default:
751 err = -ENODEV;
752 goto error;
753 }
754
755 rc->change_protocol = em28xx_ir_change_protocol;
756 rc->map_name = dev->board.ir_codes;
757
758 /* By default, keep protocol field untouched */
759 rc_type = RC_BIT_UNKNOWN;
760 err = em28xx_ir_change_protocol(rc, &rc_type);
761 if (err)
762 goto error;
763 }
764
765 /* This is how often we ask the chip for IR information */
766 ir->polling = 100; /* ms */
767
768 /* init input device */
769 snprintf(ir->name, sizeof(ir->name), "em28xx IR (%s)", dev->name);
770
771 usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
772 strlcat(ir->phys, "/input0", sizeof(ir->phys));
773
774 rc->input_name = ir->name;
775 rc->input_phys = ir->phys;
776 rc->input_id.bustype = BUS_USB;
777 rc->input_id.version = 1;
778 rc->input_id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
779 rc->input_id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
780 rc->dev.parent = &dev->udev->dev;
781 rc->driver_name = MODULE_NAME;
782
783 /* all done */
784 err = rc_register_device(rc);
785 if (err)
786 goto error;
787
788 return 0;
789
790error:
791 dev->ir = NULL;
792 rc_free_device(rc);
793 kfree(ir);
794 return err;
795}
796
797static int em28xx_ir_fini(struct em28xx *dev)
798{
799 struct em28xx_IR *ir = dev->ir;
800
801 em28xx_shutdown_buttons(dev);
802
803 /* skip detach on non attached boards */
804 if (!ir)
805 return 0;
806
807 if (ir->rc)
808 rc_unregister_device(ir->rc);
809
810 /* done */
811 kfree(ir);
812 dev->ir = NULL;
813 return 0;
814}
815
816static struct em28xx_ops rc_ops = {
817 .id = EM28XX_RC,
818 .name = "Em28xx Input Extension",
819 .init = em28xx_ir_init,
820 .fini = em28xx_ir_fini,
821};
822
823static int __init em28xx_rc_register(void)
824{
825 return em28xx_register_extension(&rc_ops);
826}
827
828static void __exit em28xx_rc_unregister(void)
829{
830 em28xx_unregister_extension(&rc_ops);
831}
832
833MODULE_LICENSE("GPL");
834MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
835MODULE_DESCRIPTION("Em28xx Input driver");
836
837module_init(em28xx_rc_register);
838module_exit(em28xx_rc_unregister);
Linux kernel - Deliverables
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