aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/video/em28xx/em28xx-input.c
blob: 5c3fd9411b1fcc25967482ffdc5e3c0e8affb056 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
/*
  handle em28xx IR remotes via linux kernel input layer.

   Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
		      Markus Rechberger <mrechberger@gmail.com>
		      Mauro Carvalho Chehab <mchehab@infradead.org>
		      Sascha Sommer <saschasommer@freenet.de>

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/usb.h>
#include <linux/slab.h>

#include "em28xx.h"

#define EM28XX_SNAPSHOT_KEY KEY_CAMERA
#define EM28XX_SBUTTON_QUERY_INTERVAL 500
#define EM28XX_R0C_USBSUSP_SNAPSHOT 0x20

static unsigned int ir_debug;
module_param(ir_debug, int, 0644);
MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");

#define MODULE_NAME "em28xx"

#define i2cdprintk(fmt, arg...) \
	if (ir_debug) { \
		printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
	}

#define dprintk(fmt, arg...) \
	if (ir_debug) { \
		printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
	}

/**********************************************************
 Polling structure used by em28xx IR's
 **********************************************************/

struct em28xx_ir_poll_result {
	unsigned int toggle_bit:1;
	unsigned int read_count:7;
	u8 rc_address;
	u8 rc_data[4]; /* 1 byte on em2860/2880, 4 on em2874 */
};

struct em28xx_IR {
	struct em28xx *dev;
	struct input_dev *input;
	struct ir_input_state ir;
	char name[32];
	char phys[32];

	/* poll external decoder */
	int polling;
	struct delayed_work work;
	unsigned int last_toggle:1;
	unsigned int full_code:1;
	unsigned int last_readcount;
	unsigned int repeat_interval;

	int  (*get_key)(struct em28xx_IR *, struct em28xx_ir_poll_result *);

	/* IR device properties */

	struct ir_dev_props props;
};

/**********************************************************
 I2C IR based get keycodes - should be used with ir-kbd-i2c
 **********************************************************/

int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
{
	unsigned char b;

	/* poll IR chip */
	if (1 != i2c_master_recv(ir->c, &b, 1)) {
		i2cdprintk("read error\n");
		return -EIO;
	}

	/* it seems that 0xFE indicates that a button is still hold
	   down, while 0xff indicates that no button is hold
	   down. 0xfe sequences are sometimes interrupted by 0xFF */

	i2cdprintk("key %02x\n", b);

	if (b == 0xff)
		return 0;

	if (b == 0xfe)
		/* keep old data */
		return 1;

	*ir_key = b;
	*ir_raw = b;
	return 1;
}

int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
{
	unsigned char buf[2];
	u16 code;
	int size;

	/* poll IR chip */
	size = i2c_master_recv(ir->c, buf, sizeof(buf));

	if (size != 2)
		return -EIO;

	/* Does eliminate repeated parity code */
	if (buf[1] == 0xff)
		return 0;

	ir->old = buf[1];

	/*
	 * Rearranges bits to the right order.
	 * The bit order were determined experimentally by using
	 * The original Hauppauge Grey IR and another RC5 that uses addr=0x08
	 * The RC5 code has 14 bits, but we've experimentally determined
	 * the meaning for only 11 bits.
	 * So, the code translation is not complete. Yet, it is enough to
	 * work with the provided RC5 IR.
	 */
	code =
		 ((buf[0] & 0x01) ? 0x0020 : 0) | /* 		0010 0000 */
		 ((buf[0] & 0x02) ? 0x0010 : 0) | /* 		0001 0000 */
		 ((buf[0] & 0x04) ? 0x0008 : 0) | /* 		0000 1000 */
		 ((buf[0] & 0x08) ? 0x0004 : 0) | /* 		0000 0100 */
		 ((buf[0] & 0x10) ? 0x0002 : 0) | /* 		0000 0010 */
		 ((buf[0] & 0x20) ? 0x0001 : 0) | /* 		0000 0001 */
		 ((buf[1] & 0x08) ? 0x1000 : 0) | /* 0001 0000		  */
		 ((buf[1] & 0x10) ? 0x0800 : 0) | /* 0000 1000		  */
		 ((buf[1] & 0x20) ? 0x0400 : 0) | /* 0000 0100		  */
		 ((buf[1] & 0x40) ? 0x0200 : 0) | /* 0000 0010		  */
		 ((buf[1] & 0x80) ? 0x0100 : 0);  /* 0000 0001		  */

	i2cdprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x%02x)\n",
			code, buf[1], buf[0]);

	/* return key */
	*ir_key = code;
	*ir_raw = code;
	return 1;
}

int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
				     u32 *ir_raw)
{
	unsigned char buf[3];

	/* poll IR chip */

	if (3 != i2c_master_recv(ir->c, buf, 3)) {
		i2cdprintk("read error\n");
		return -EIO;
	}

	i2cdprintk("key %02x\n", buf[2]&0x3f);
	if (buf[0] != 0x00)
		return 0;

	*ir_key = buf[2]&0x3f;
	*ir_raw = buf[2]&0x3f;

	return 1;
}

int em28xx_get_key_winfast_usbii_deluxe(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
{
	unsigned char subaddr, keydetect, key;

	struct i2c_msg msg[] = { { .addr = ir->c->addr, .flags = 0, .buf = &subaddr, .len = 1},

				{ .addr = ir->c->addr, .flags = I2C_M_RD, .buf = &keydetect, .len = 1} };

	subaddr = 0x10;
	if (2 != i2c_transfer(ir->c->adapter, msg, 2)) {
		i2cdprintk("read error\n");
		return -EIO;
	}
	if (keydetect == 0x00)
		return 0;

	subaddr = 0x00;
	msg[1].buf = &key;
	if (2 != i2c_transfer(ir->c->adapter, msg, 2)) {
		i2cdprintk("read error\n");
	return -EIO;
	}
	if (key == 0x00)
		return 0;

	*ir_key = key;
	*ir_raw = key;
	return 1;
}

/**********************************************************
 Poll based get keycode functions
 **********************************************************/

/* This is for the em2860/em2880 */
static int default_polling_getkey(struct em28xx_IR *ir,
				  struct em28xx_ir_poll_result *poll_result)
{
	struct em28xx *dev = ir->dev;
	int rc;
	u8 msg[3] = { 0, 0, 0 };

	/* Read key toggle, brand, and key code
	   on registers 0x45, 0x46 and 0x47
	 */
	rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
					  msg, sizeof(msg));
	if (rc < 0)
		return rc;

	/* Infrared toggle (Reg 0x45[7]) */
	poll_result->toggle_bit = (msg[0] >> 7);

	/* Infrared read count (Reg 0x45[6:0] */
	poll_result->read_count = (msg[0] & 0x7f);

	/* Remote Control Address (Reg 0x46) */
	poll_result->rc_address = msg[1];

	/* Remote Control Data (Reg 0x47) */
	poll_result->rc_data[0] = msg[2];

	return 0;
}

static int em2874_polling_getkey(struct em28xx_IR *ir,
				 struct em28xx_ir_poll_result *poll_result)
{
	struct em28xx *dev = ir->dev;
	int rc;
	u8 msg[5] = { 0, 0, 0, 0, 0 };

	/* Read key toggle, brand, and key code
	   on registers 0x51-55
	 */
	rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
					  msg, sizeof(msg));
	if (rc < 0)
		return rc;

	/* Infrared toggle (Reg 0x51[7]) */
	poll_result->toggle_bit = (msg[0] >> 7);

	/* Infrared read count (Reg 0x51[6:0] */
	poll_result->read_count = (msg[0] & 0x7f);

	/* Remote Control Address (Reg 0x52) */
	poll_result->rc_address = msg[1];

	/* Remote Control Data (Reg 0x53-55) */
	poll_result->rc_data[0] = msg[2];
	poll_result->rc_data[1] = msg[3];
	poll_result->rc_data[2] = msg[4];

	return 0;
}

/**********************************************************
 Polling code for em28xx
 **********************************************************/

static void em28xx_ir_handle_key(struct em28xx_IR *ir)
{
	int result;
	int do_sendkey = 0;
	struct em28xx_ir_poll_result poll_result;

	/* read the registers containing the IR status */
	result = ir->get_key(ir, &poll_result);
	if (result < 0) {
		dprintk("ir->get_key() failed %d\n", result);
		return;
	}

	dprintk("ir->get_key result tb=%02x rc=%02x lr=%02x data=%02x%02x\n",
		poll_result.toggle_bit, poll_result.read_count,
		ir->last_readcount, poll_result.rc_address,
		poll_result.rc_data[0]);

	if (ir->dev->chip_id == CHIP_ID_EM2874) {
		/* The em2874 clears the readcount field every time the
		   register is read.  The em2860/2880 datasheet says that it
		   is supposed to clear the readcount, but it doesn't.  So with
		   the em2874, we are looking for a non-zero read count as
		   opposed to a readcount that is incrementing */
		ir->last_readcount = 0;
	}

	if (poll_result.read_count == 0) {
		/* The button has not been pressed since the last read */
	} else if (ir->last_toggle != poll_result.toggle_bit) {
		/* A button has been pressed */
		dprintk("button has been pressed\n");
		ir->last_toggle = poll_result.toggle_bit;
		ir->repeat_interval = 0;
		do_sendkey = 1;
	} else if (poll_result.toggle_bit == ir->last_toggle &&
		   poll_result.read_count > 0 &&
		   poll_result.read_count != ir->last_readcount) {
		/* The button is still being held down */
		dprintk("button being held down\n");

		/* Debouncer for first keypress */
		if (ir->repeat_interval++ > 9) {
			/* Start repeating after 1 second */
			do_sendkey = 1;
		}
	}

	if (do_sendkey) {
		dprintk("sending keypress\n");

		if (ir->full_code)
			ir_input_keydown(ir->input, &ir->ir,
					 poll_result.rc_address << 8 |
					 poll_result.rc_data[0]);
		else
			ir_input_keydown(ir->input, &ir->ir,
					 poll_result.rc_data[0]);

		ir_input_nokey(ir->input, &ir->ir);
	}

	ir->last_readcount = poll_result.read_count;
	return;
}

static void em28xx_ir_work(struct work_struct *work)
{
	struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);

	em28xx_ir_handle_key(ir);
	schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
}

static int em28xx_ir_start(void *priv)
{
	struct em28xx_IR *ir = priv;

	INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
	schedule_delayed_work(&ir->work, 0);

	return 0;
}

static void em28xx_ir_stop(void *priv)
{
	struct em28xx_IR *ir = priv;

	cancel_delayed_work_sync(&ir->work);
}

int em28xx_ir_change_protocol(void *priv, u64 ir_type)
{
	int rc = 0;
	struct em28xx_IR *ir = priv;
	struct em28xx *dev = ir->dev;
	u8 ir_config = EM2874_IR_RC5;

	/* Adjust xclk based o IR table for RC5/NEC tables */

	if (ir_type == IR_TYPE_RC5) {
		dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
		ir->full_code = 1;
	} else if (ir_type == IR_TYPE_NEC) {
		dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
		ir_config = EM2874_IR_NEC;
		ir->full_code = 1;
	} else if (ir_type != IR_TYPE_UNKNOWN)
		rc = -EINVAL;

	em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
			      EM28XX_XCLK_IR_RC5_MODE);

	/* Setup the proper handler based on the chip */
	switch (dev->chip_id) {
	case CHIP_ID_EM2860:
	case CHIP_ID_EM2883:
		ir->get_key = default_polling_getkey;
		break;
	case CHIP_ID_EM2874:
		ir->get_key = em2874_polling_getkey;
		em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
		break;
	default:
		printk("Unrecognized em28xx chip id: IR not supported\n");
		rc = -EINVAL;
	}

	return rc;
}

int em28xx_ir_init(struct em28xx *dev)
{
	struct em28xx_IR *ir;
	struct input_dev *input_dev;
	int err = -ENOMEM;

	if (dev->board.ir_codes == NULL) {
		/* No remote control support */
		return 0;
	}

	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!ir || !input_dev)
		goto err_out_free;

	/* record handles to ourself */
	ir->dev = dev;
	dev->ir = ir;

	ir->input = input_dev;

	/*
	 * em2874 supports more protocols. For now, let's just announce
	 * the two protocols that were already tested
	 */
	ir->props.allowed_protos = IR_TYPE_RC5 | IR_TYPE_NEC;
	ir->props.priv = ir;
	ir->props.change_protocol = em28xx_ir_change_protocol;
	ir->props.open = em28xx_ir_start;
	ir->props.close = em28xx_ir_stop;

	/* By default, keep protocol field untouched */
	err = em28xx_ir_change_protocol(ir, IR_TYPE_UNKNOWN);
	if (err)
		goto err_out_free;

	/* This is how often we ask the chip for IR information */
	ir->polling = 100; /* ms */

	/* init input device */
	snprintf(ir->name, sizeof(ir->name), "em28xx IR (%s)",
						dev->name);

	usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
	strlcat(ir->phys, "/input0", sizeof(ir->phys));

	/* Set IR protocol */
	err = ir_input_init(input_dev, &ir->ir, IR_TYPE_OTHER);
	if (err < 0)
		goto err_out_free;

	input_dev->name = ir->name;
	input_dev->phys = ir->phys;
	input_dev->id.bustype = BUS_USB;
	input_dev->id.version = 1;
	input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
	input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);

	input_dev->dev.parent = &dev->udev->dev;



	/* all done */
	err = ir_input_register(ir->input, dev->board.ir_codes,
				&ir->props, MODULE_NAME);
	if (err)
		goto err_out_stop;

	return 0;
 err_out_stop:
	dev->ir = NULL;
 err_out_free:
	kfree(ir);
	return err;
}

int em28xx_ir_fini(struct em28xx *dev)
{
	struct em28xx_IR *ir = dev->ir;

	/* skip detach on non attached boards */
	if (!ir)
		return 0;

	em28xx_ir_stop(ir);
	ir_input_unregister(ir->input);
	kfree(ir);

	/* done */
	dev->ir = NULL;
	return 0;
}

/**********************************************************
 Handle Webcam snapshot button
 **********************************************************/

static void em28xx_query_sbutton(struct work_struct *work)
{
	/* Poll the register and see if the button is depressed */
	struct em28xx *dev =
		container_of(work, struct em28xx, sbutton_query_work.work);
	int ret;

	ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP);

	if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) {
		u8 cleared;
		/* Button is depressed, clear the register */
		cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT;
		em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1);

		/* Not emulate the keypress */
		input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
				 1);
		/* Now unpress the key */
		input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
				 0);
	}

	/* Schedule next poll */
	schedule_delayed_work(&dev->sbutton_query_work,
			      msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
}

void em28xx_register_snapshot_button(struct em28xx *dev)
{
	struct input_dev *input_dev;
	int err;

	em28xx_info("Registering snapshot button...\n");
	input_dev = input_allocate_device();
	if (!input_dev) {
		em28xx_errdev("input_allocate_device failed\n");
		return;
	}

	usb_make_path(dev->udev, dev->snapshot_button_path,
		      sizeof(dev->snapshot_button_path));
	strlcat(dev->snapshot_button_path, "/sbutton",
		sizeof(dev->snapshot_button_path));
	INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton);

	input_dev->name = "em28xx snapshot button";
	input_dev->phys = dev->snapshot_button_path;
	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
	set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
	input_dev->keycodesize = 0;
	input_dev->keycodemax = 0;
	input_dev->id.bustype = BUS_USB;
	input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
	input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
	input_dev->id.version = 1;
	input_dev->dev.parent = &dev->udev->dev;

	err = input_register_device(input_dev);
	if (err) {
		em28xx_errdev("input_register_device failed\n");
		input_free_device(input_dev);
		return;
	}

	dev->sbutton_input_dev = input_dev;
	schedule_delayed_work(&dev->sbutton_query_work,
			      msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
	return;

}

void em28xx_deregister_snapshot_button(struct em28xx *dev)
{
	if (dev->sbutton_input_dev != NULL) {
		em28xx_info("Deregistering snapshot button\n");
		cancel_rearming_delayed_work(&dev->sbutton_query_work);
		input_unregister_device(dev->sbutton_input_dev);
		dev->sbutton_input_dev = NULL;
	}
	return;
}