1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // handle em28xx IR remotes via linux kernel input layer.
4 //
5 // Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
6 //		      Markus Rechberger <mrechberger@gmail.com>
7 //		      Mauro Carvalho Chehab <mchehab@kernel.org>
8 //		      Sascha Sommer <saschasommer@freenet.de>
9 
10 #include "em28xx.h"
11 
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/delay.h>
15 #include <linux/interrupt.h>
16 #include <linux/usb.h>
17 #include <linux/usb/input.h>
18 #include <linux/slab.h>
19 #include <linux/bitrev.h>
20 
21 #define EM28XX_SNAPSHOT_KEY				KEY_CAMERA
22 #define EM28XX_BUTTONS_DEBOUNCED_QUERY_INTERVAL		500 /* [ms] */
23 #define EM28XX_BUTTONS_VOLATILE_QUERY_INTERVAL		100 /* [ms] */
24 
25 static unsigned int ir_debug;
26 module_param(ir_debug, int, 0644);
27 MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
28 
29 #define MODULE_NAME "em28xx"
30 
31 #define dprintk(fmt, arg...) do {					\
32 	if (ir_debug)							\
33 		dev_printk(KERN_DEBUG, &ir->dev->intf->dev,		\
34 			   "input: %s: " fmt, __func__, ## arg);	\
35 } while (0)
36 
37 /*
38  * Polling structure used by em28xx IR's
39  */
40 
41 struct em28xx_ir_poll_result {
42 	unsigned int toggle_bit:1;
43 	unsigned int read_count:7;
44 
45 	enum rc_proto protocol;
46 	u32 scancode;
47 };
48 
49 struct em28xx_IR {
50 	struct em28xx *dev;
51 	struct rc_dev *rc;
52 	char phys[32];
53 
54 	/* poll decoder */
55 	int polling;
56 	struct delayed_work work;
57 	unsigned int full_code:1;
58 	unsigned int last_readcount;
59 	u64 rc_proto;
60 
61 	struct i2c_client *i2c_client;
62 
63 	int  (*get_key_i2c)(struct i2c_client *ir, enum rc_proto *protocol,
64 			    u32 *scancode);
65 	int  (*get_key)(struct em28xx_IR *ir, struct em28xx_ir_poll_result *r);
66 };
67 
68 /*
69  * I2C IR based get keycodes - should be used with ir-kbd-i2c
70  */
71 
72 static int em28xx_get_key_terratec(struct i2c_client *i2c_dev,
73 				   enum rc_proto *protocol, u32 *scancode)
74 {
75 	int rc;
76 	unsigned char b;
77 
78 	/* poll IR chip */
79 	rc = i2c_master_recv(i2c_dev, &b, 1);
80 	if (rc != 1) {
81 		if (rc < 0)
82 			return rc;
83 		return -EIO;
84 	}
85 
86 	/*
87 	 * it seems that 0xFE indicates that a button is still hold
88 	 * down, while 0xff indicates that no button is hold down.
89 	 */
90 
91 	if (b == 0xff)
92 		return 0;
93 
94 	if (b == 0xfe)
95 		/* keep old data */
96 		return 1;
97 
98 	*protocol = RC_PROTO_UNKNOWN;
99 	*scancode = b;
100 	return 1;
101 }
102 
103 static int em28xx_get_key_em_haup(struct i2c_client *i2c_dev,
104 				  enum rc_proto *protocol, u32 *scancode)
105 {
106 	unsigned char buf[2];
107 	int size;
108 
109 	/* poll IR chip */
110 	size = i2c_master_recv(i2c_dev, buf, sizeof(buf));
111 
112 	if (size != 2)
113 		return -EIO;
114 
115 	/* Does eliminate repeated parity code */
116 	if (buf[1] == 0xff)
117 		return 0;
118 
119 	/*
120 	 * Rearranges bits to the right order.
121 	 * The bit order were determined experimentally by using
122 	 * The original Hauppauge Grey IR and another RC5 that uses addr=0x08
123 	 * The RC5 code has 14 bits, but we've experimentally determined
124 	 * the meaning for only 11 bits.
125 	 * So, the code translation is not complete. Yet, it is enough to
126 	 * work with the provided RC5 IR.
127 	 */
128 	*protocol = RC_PROTO_RC5;
129 	*scancode = (bitrev8(buf[1]) & 0x1f) << 8 | bitrev8(buf[0]) >> 2;
130 	return 1;
131 }
132 
133 static int em28xx_get_key_pinnacle_usb_grey(struct i2c_client *i2c_dev,
134 					    enum rc_proto *protocol,
135 					    u32 *scancode)
136 {
137 	unsigned char buf[3];
138 
139 	/* poll IR chip */
140 
141 	if (i2c_master_recv(i2c_dev, buf, 3) != 3)
142 		return -EIO;
143 
144 	if (buf[0] != 0x00)
145 		return 0;
146 
147 	*protocol = RC_PROTO_UNKNOWN;
148 	*scancode = buf[2] & 0x3f;
149 	return 1;
150 }
151 
152 static int em28xx_get_key_winfast_usbii_deluxe(struct i2c_client *i2c_dev,
153 					       enum rc_proto *protocol,
154 					       u32 *scancode)
155 {
156 	unsigned char subaddr, keydetect, key;
157 
158 	struct i2c_msg msg[] = {
159 		{
160 			.addr = i2c_dev->addr,
161 			.flags = 0,
162 			.buf = &subaddr, .len = 1
163 		}, {
164 			.addr = i2c_dev->addr,
165 			.flags = I2C_M_RD,
166 			.buf = &keydetect,
167 			.len = 1
168 		}
169 	};
170 
171 	subaddr = 0x10;
172 	if (i2c_transfer(i2c_dev->adapter, msg, 2) != 2)
173 		return -EIO;
174 	if (keydetect == 0x00)
175 		return 0;
176 
177 	subaddr = 0x00;
178 	msg[1].buf = &key;
179 	if (i2c_transfer(i2c_dev->adapter, msg, 2) != 2)
180 		return -EIO;
181 	if (key == 0x00)
182 		return 0;
183 
184 	*protocol = RC_PROTO_UNKNOWN;
185 	*scancode = key;
186 	return 1;
187 }
188 
189 /*
190  * Poll based get keycode functions
191  */
192 
193 /* This is for the em2860/em2880 */
194 static int default_polling_getkey(struct em28xx_IR *ir,
195 				  struct em28xx_ir_poll_result *poll_result)
196 {
197 	struct em28xx *dev = ir->dev;
198 	int rc;
199 	u8 msg[3] = { 0, 0, 0 };
200 
201 	/*
202 	 * Read key toggle, brand, and key code
203 	 * on registers 0x45, 0x46 and 0x47
204 	 */
205 	rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
206 					  msg, sizeof(msg));
207 	if (rc < 0)
208 		return rc;
209 
210 	/* Infrared toggle (Reg 0x45[7]) */
211 	poll_result->toggle_bit = (msg[0] >> 7);
212 
213 	/* Infrared read count (Reg 0x45[6:0] */
214 	poll_result->read_count = (msg[0] & 0x7f);
215 
216 	/* Remote Control Address/Data (Regs 0x46/0x47) */
217 	switch (ir->rc_proto) {
218 	case RC_PROTO_BIT_RC5:
219 		poll_result->protocol = RC_PROTO_RC5;
220 		poll_result->scancode = RC_SCANCODE_RC5(msg[1], msg[2]);
221 		break;
222 
223 	case RC_PROTO_BIT_NEC:
224 		poll_result->protocol = RC_PROTO_NEC;
225 		poll_result->scancode = RC_SCANCODE_NEC(msg[1], msg[2]);
226 		break;
227 
228 	default:
229 		poll_result->protocol = RC_PROTO_UNKNOWN;
230 		poll_result->scancode = msg[1] << 8 | msg[2];
231 		break;
232 	}
233 
234 	return 0;
235 }
236 
237 static int em2874_polling_getkey(struct em28xx_IR *ir,
238 				 struct em28xx_ir_poll_result *poll_result)
239 {
240 	struct em28xx *dev = ir->dev;
241 	int rc;
242 	u8 msg[5] = { 0, 0, 0, 0, 0 };
243 
244 	/*
245 	 * Read key toggle, brand, and key code
246 	 * on registers 0x51-55
247 	 */
248 	rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
249 					  msg, sizeof(msg));
250 	if (rc < 0)
251 		return rc;
252 
253 	/* Infrared toggle (Reg 0x51[7]) */
254 	poll_result->toggle_bit = (msg[0] >> 7);
255 
256 	/* Infrared read count (Reg 0x51[6:0] */
257 	poll_result->read_count = (msg[0] & 0x7f);
258 
259 	/*
260 	 * Remote Control Address (Reg 0x52)
261 	 * Remote Control Data (Reg 0x53-0x55)
262 	 */
263 	switch (ir->rc_proto) {
264 	case RC_PROTO_BIT_RC5:
265 		poll_result->protocol = RC_PROTO_RC5;
266 		poll_result->scancode = RC_SCANCODE_RC5(msg[1], msg[2]);
267 		break;
268 
269 	case RC_PROTO_BIT_NEC:
270 		poll_result->scancode = ir_nec_bytes_to_scancode(msg[1], msg[2], msg[3], msg[4],
271 								 &poll_result->protocol);
272 		break;
273 
274 	case RC_PROTO_BIT_RC6_0:
275 		poll_result->protocol = RC_PROTO_RC6_0;
276 		poll_result->scancode = RC_SCANCODE_RC6_0(msg[1], msg[2]);
277 		break;
278 
279 	default:
280 		poll_result->protocol = RC_PROTO_UNKNOWN;
281 		poll_result->scancode = (msg[1] << 24) | (msg[2] << 16) |
282 					(msg[3] << 8)  | msg[4];
283 		break;
284 	}
285 
286 	return 0;
287 }
288 
289 /*
290  * Polling code for em28xx
291  */
292 
293 static int em28xx_i2c_ir_handle_key(struct em28xx_IR *ir)
294 {
295 	static u32 scancode;
296 	enum rc_proto protocol;
297 	int rc;
298 
299 	rc = ir->get_key_i2c(ir->i2c_client, &protocol, &scancode);
300 	if (rc < 0) {
301 		dprintk("ir->get_key_i2c() failed: %d\n", rc);
302 		return rc;
303 	}
304 
305 	if (rc) {
306 		dprintk("%s: proto = 0x%04x, scancode = 0x%04x\n",
307 			__func__, protocol, scancode);
308 		rc_keydown(ir->rc, protocol, scancode, 0);
309 	}
310 	return 0;
311 }
312 
313 static void em28xx_ir_handle_key(struct em28xx_IR *ir)
314 {
315 	int result;
316 	struct em28xx_ir_poll_result poll_result;
317 
318 	/* read the registers containing the IR status */
319 	result = ir->get_key(ir, &poll_result);
320 	if (unlikely(result < 0)) {
321 		dprintk("ir->get_key() failed: %d\n", result);
322 		return;
323 	}
324 
325 	if (unlikely(poll_result.read_count != ir->last_readcount)) {
326 		dprintk("%s: toggle: %d, count: %d, key 0x%04x\n", __func__,
327 			poll_result.toggle_bit, poll_result.read_count,
328 			poll_result.scancode);
329 		if (ir->full_code)
330 			rc_keydown(ir->rc,
331 				   poll_result.protocol,
332 				   poll_result.scancode,
333 				   poll_result.toggle_bit);
334 		else
335 			rc_keydown(ir->rc,
336 				   RC_PROTO_UNKNOWN,
337 				   poll_result.scancode & 0xff,
338 				   poll_result.toggle_bit);
339 
340 		if (ir->dev->chip_id == CHIP_ID_EM2874 ||
341 		    ir->dev->chip_id == CHIP_ID_EM2884)
342 			/*
343 			 * The em2874 clears the readcount field every time the
344 			 * register is read.  The em2860/2880 datasheet says
345 			 * that it is supposed to clear the readcount, but it
346 			 * doesn't. So with the em2874, we are looking for a
347 			 * non-zero read count as opposed to a readcount
348 			 * that is incrementing
349 			 */
350 			ir->last_readcount = 0;
351 		else
352 			ir->last_readcount = poll_result.read_count;
353 	}
354 }
355 
356 static void em28xx_ir_work(struct work_struct *work)
357 {
358 	struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);
359 
360 	if (ir->i2c_client) /* external i2c device */
361 		em28xx_i2c_ir_handle_key(ir);
362 	else /* internal device */
363 		em28xx_ir_handle_key(ir);
364 	schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
365 }
366 
367 static int em28xx_ir_start(struct rc_dev *rc)
368 {
369 	struct em28xx_IR *ir = rc->priv;
370 
371 	INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
372 	schedule_delayed_work(&ir->work, 0);
373 
374 	return 0;
375 }
376 
377 static void em28xx_ir_stop(struct rc_dev *rc)
378 {
379 	struct em28xx_IR *ir = rc->priv;
380 
381 	cancel_delayed_work_sync(&ir->work);
382 }
383 
384 static int em2860_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_proto)
385 {
386 	struct em28xx_IR *ir = rc_dev->priv;
387 	struct em28xx *dev = ir->dev;
388 
389 	/* Adjust xclk based on IR table for RC5/NEC tables */
390 	if (*rc_proto & RC_PROTO_BIT_RC5) {
391 		dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
392 		ir->full_code = 1;
393 		*rc_proto = RC_PROTO_BIT_RC5;
394 	} else if (*rc_proto & RC_PROTO_BIT_NEC) {
395 		dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
396 		ir->full_code = 1;
397 		*rc_proto = RC_PROTO_BIT_NEC;
398 	} else if (*rc_proto & RC_PROTO_BIT_UNKNOWN) {
399 		*rc_proto = RC_PROTO_BIT_UNKNOWN;
400 	} else {
401 		*rc_proto = ir->rc_proto;
402 		return -EINVAL;
403 	}
404 	em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
405 			      EM28XX_XCLK_IR_RC5_MODE);
406 
407 	ir->rc_proto = *rc_proto;
408 
409 	return 0;
410 }
411 
412 static int em2874_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_proto)
413 {
414 	struct em28xx_IR *ir = rc_dev->priv;
415 	struct em28xx *dev = ir->dev;
416 	u8 ir_config = EM2874_IR_RC5;
417 
418 	/* Adjust xclk and set type based on IR table for RC5/NEC/RC6 tables */
419 	if (*rc_proto & RC_PROTO_BIT_RC5) {
420 		dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
421 		ir->full_code = 1;
422 		*rc_proto = RC_PROTO_BIT_RC5;
423 	} else if (*rc_proto & RC_PROTO_BIT_NEC) {
424 		dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
425 		ir_config = EM2874_IR_NEC | EM2874_IR_NEC_NO_PARITY;
426 		ir->full_code = 1;
427 		*rc_proto = RC_PROTO_BIT_NEC;
428 	} else if (*rc_proto & RC_PROTO_BIT_RC6_0) {
429 		dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
430 		ir_config = EM2874_IR_RC6_MODE_0;
431 		ir->full_code = 1;
432 		*rc_proto = RC_PROTO_BIT_RC6_0;
433 	} else if (*rc_proto & RC_PROTO_BIT_UNKNOWN) {
434 		*rc_proto = RC_PROTO_BIT_UNKNOWN;
435 	} else {
436 		*rc_proto = ir->rc_proto;
437 		return -EINVAL;
438 	}
439 	em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
440 	em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
441 			      EM28XX_XCLK_IR_RC5_MODE);
442 
443 	ir->rc_proto = *rc_proto;
444 
445 	return 0;
446 }
447 
448 static int em28xx_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_proto)
449 {
450 	struct em28xx_IR *ir = rc_dev->priv;
451 	struct em28xx *dev = ir->dev;
452 
453 	/* Setup the proper handler based on the chip */
454 	switch (dev->chip_id) {
455 	case CHIP_ID_EM2860:
456 	case CHIP_ID_EM2883:
457 		return em2860_ir_change_protocol(rc_dev, rc_proto);
458 	case CHIP_ID_EM2884:
459 	case CHIP_ID_EM2874:
460 	case CHIP_ID_EM28174:
461 	case CHIP_ID_EM28178:
462 		return em2874_ir_change_protocol(rc_dev, rc_proto);
463 	default:
464 		dev_err(&ir->dev->intf->dev,
465 			"Unrecognized em28xx chip id 0x%02x: IR not supported\n",
466 			dev->chip_id);
467 		return -EINVAL;
468 	}
469 }
470 
471 static int em28xx_probe_i2c_ir(struct em28xx *dev)
472 {
473 	int i = 0;
474 	/*
475 	 * Leadtek winfast tv USBII deluxe can find a non working IR-device
476 	 * at address 0x18, so if that address is needed for another board in
477 	 * the future, please put it after 0x1f.
478 	 */
479 	static const unsigned short addr_list[] = {
480 		 0x1f, 0x30, 0x47, I2C_CLIENT_END
481 	};
482 
483 	while (addr_list[i] != I2C_CLIENT_END) {
484 		if (i2c_probe_func_quick_read(&dev->i2c_adap[dev->def_i2c_bus],
485 					      addr_list[i]) == 1)
486 			return addr_list[i];
487 		i++;
488 	}
489 
490 	return -ENODEV;
491 }
492 
493 /*
494  * Handle buttons
495  */
496 
497 static void em28xx_query_buttons(struct work_struct *work)
498 {
499 	struct em28xx *dev =
500 		container_of(work, struct em28xx, buttons_query_work.work);
501 	u8 i, j;
502 	int regval;
503 	bool is_pressed, was_pressed;
504 	const struct em28xx_led *led;
505 
506 	/* Poll and evaluate all addresses */
507 	for (i = 0; i < dev->num_button_polling_addresses; i++) {
508 		/* Read value from register */
509 		regval = em28xx_read_reg(dev, dev->button_polling_addresses[i]);
510 		if (regval < 0)
511 			continue;
512 		/* Check states of the buttons and act */
513 		j = 0;
514 		while (dev->board.buttons[j].role >= 0 &&
515 		       dev->board.buttons[j].role < EM28XX_NUM_BUTTON_ROLES) {
516 			const struct em28xx_button *button;
517 
518 			button = &dev->board.buttons[j];
519 
520 			/* Check if button uses the current address */
521 			if (button->reg_r != dev->button_polling_addresses[i]) {
522 				j++;
523 				continue;
524 			}
525 			/* Determine if button is and was pressed last time */
526 			is_pressed = regval & button->mask;
527 			was_pressed = dev->button_polling_last_values[i]
528 				       & button->mask;
529 			if (button->inverted) {
530 				is_pressed = !is_pressed;
531 				was_pressed = !was_pressed;
532 			}
533 			/* Clear button state (if needed) */
534 			if (is_pressed && button->reg_clearing)
535 				em28xx_write_reg(dev, button->reg_clearing,
536 						 (~regval & button->mask)
537 						    | (regval & ~button->mask));
538 			/* Handle button state */
539 			if (!is_pressed || was_pressed) {
540 				j++;
541 				continue;
542 			}
543 			switch (button->role) {
544 			case EM28XX_BUTTON_SNAPSHOT:
545 				/* Emulate the keypress */
546 				input_report_key(dev->sbutton_input_dev,
547 						 EM28XX_SNAPSHOT_KEY, 1);
548 				/* Unpress the key */
549 				input_report_key(dev->sbutton_input_dev,
550 						 EM28XX_SNAPSHOT_KEY, 0);
551 				break;
552 			case EM28XX_BUTTON_ILLUMINATION:
553 				led = em28xx_find_led(dev,
554 						      EM28XX_LED_ILLUMINATION);
555 				/* Switch illumination LED on/off */
556 				if (led)
557 					em28xx_toggle_reg_bits(dev,
558 							       led->gpio_reg,
559 							       led->gpio_mask);
560 				break;
561 			default:
562 				WARN_ONCE(1, "BUG: unhandled button role.");
563 			}
564 			/* Next button */
565 			j++;
566 		}
567 		/* Save current value for comparison during the next polling */
568 		dev->button_polling_last_values[i] = regval;
569 	}
570 	/* Schedule next poll */
571 	schedule_delayed_work(&dev->buttons_query_work,
572 			      msecs_to_jiffies(dev->button_polling_interval));
573 }
574 
575 static int em28xx_register_snapshot_button(struct em28xx *dev)
576 {
577 	struct usb_device *udev = interface_to_usbdev(dev->intf);
578 	struct input_dev *input_dev;
579 	int err;
580 
581 	dev_info(&dev->intf->dev, "Registering snapshot button...\n");
582 	input_dev = input_allocate_device();
583 	if (!input_dev)
584 		return -ENOMEM;
585 
586 	usb_make_path(udev, dev->snapshot_button_path,
587 		      sizeof(dev->snapshot_button_path));
588 	strlcat(dev->snapshot_button_path, "/sbutton",
589 		sizeof(dev->snapshot_button_path));
590 
591 	input_dev->name = "em28xx snapshot button";
592 	input_dev->phys = dev->snapshot_button_path;
593 	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
594 	set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
595 	input_dev->keycodesize = 0;
596 	input_dev->keycodemax = 0;
597 	usb_to_input_id(udev, &input_dev->id);
598 	input_dev->dev.parent = &dev->intf->dev;
599 
600 	err = input_register_device(input_dev);
601 	if (err) {
602 		dev_err(&dev->intf->dev, "input_register_device failed\n");
603 		input_free_device(input_dev);
604 		return err;
605 	}
606 
607 	dev->sbutton_input_dev = input_dev;
608 	return 0;
609 }
610 
611 static void em28xx_init_buttons(struct em28xx *dev)
612 {
613 	u8  i = 0, j = 0;
614 	bool addr_new = false;
615 
616 	dev->button_polling_interval = EM28XX_BUTTONS_DEBOUNCED_QUERY_INTERVAL;
617 	while (dev->board.buttons[i].role >= 0 &&
618 	       dev->board.buttons[i].role < EM28XX_NUM_BUTTON_ROLES) {
619 		const struct em28xx_button *button = &dev->board.buttons[i];
620 
621 		/* Check if polling address is already on the list */
622 		addr_new = true;
623 		for (j = 0; j < dev->num_button_polling_addresses; j++) {
624 			if (button->reg_r == dev->button_polling_addresses[j]) {
625 				addr_new = false;
626 				break;
627 			}
628 		}
629 		/* Check if max. number of polling addresses is exceeded */
630 		if (addr_new && dev->num_button_polling_addresses
631 					   >= EM28XX_NUM_BUTTON_ADDRESSES_MAX) {
632 			WARN_ONCE(1, "BUG: maximum number of button polling addresses exceeded.");
633 			goto next_button;
634 		}
635 		/* Button role specific checks and actions */
636 		if (button->role == EM28XX_BUTTON_SNAPSHOT) {
637 			/* Register input device */
638 			if (em28xx_register_snapshot_button(dev) < 0)
639 				goto next_button;
640 		} else if (button->role == EM28XX_BUTTON_ILLUMINATION) {
641 			/* Check sanity */
642 			if (!em28xx_find_led(dev, EM28XX_LED_ILLUMINATION)) {
643 				dev_err(&dev->intf->dev,
644 					"BUG: illumination button defined, but no illumination LED.\n");
645 				goto next_button;
646 			}
647 		}
648 		/* Add read address to list of polling addresses */
649 		if (addr_new) {
650 			unsigned int index = dev->num_button_polling_addresses;
651 
652 			dev->button_polling_addresses[index] = button->reg_r;
653 			dev->num_button_polling_addresses++;
654 		}
655 		/* Reduce polling interval if necessary */
656 		if (!button->reg_clearing)
657 			dev->button_polling_interval =
658 					 EM28XX_BUTTONS_VOLATILE_QUERY_INTERVAL;
659 next_button:
660 		/* Next button */
661 		i++;
662 	}
663 
664 	/* Start polling */
665 	if (dev->num_button_polling_addresses) {
666 		memset(dev->button_polling_last_values, 0,
667 		       EM28XX_NUM_BUTTON_ADDRESSES_MAX);
668 		schedule_delayed_work(&dev->buttons_query_work,
669 				      msecs_to_jiffies(dev->button_polling_interval));
670 	}
671 }
672 
673 static void em28xx_shutdown_buttons(struct em28xx *dev)
674 {
675 	/* Cancel polling */
676 	cancel_delayed_work_sync(&dev->buttons_query_work);
677 	/* Clear polling addresses list */
678 	dev->num_button_polling_addresses = 0;
679 	/* Deregister input devices */
680 	if (dev->sbutton_input_dev) {
681 		dev_info(&dev->intf->dev, "Deregistering snapshot button\n");
682 		input_unregister_device(dev->sbutton_input_dev);
683 		dev->sbutton_input_dev = NULL;
684 	}
685 }
686 
687 static int em28xx_ir_init(struct em28xx *dev)
688 {
689 	struct usb_device *udev = interface_to_usbdev(dev->intf);
690 	struct em28xx_IR *ir;
691 	struct rc_dev *rc;
692 	int err = -ENOMEM;
693 	u64 rc_proto;
694 	u16 i2c_rc_dev_addr = 0;
695 
696 	if (dev->is_audio_only) {
697 		/* Shouldn't initialize IR for this interface */
698 		return 0;
699 	}
700 
701 	kref_get(&dev->ref);
702 	INIT_DELAYED_WORK(&dev->buttons_query_work, em28xx_query_buttons);
703 
704 	if (dev->board.buttons)
705 		em28xx_init_buttons(dev);
706 
707 	if (dev->board.has_ir_i2c) {
708 		i2c_rc_dev_addr = em28xx_probe_i2c_ir(dev);
709 		if (!i2c_rc_dev_addr) {
710 			dev->board.has_ir_i2c = 0;
711 			dev_warn(&dev->intf->dev,
712 				 "No i2c IR remote control device found.\n");
713 			err = -ENODEV;
714 			goto ref_put;
715 		}
716 	}
717 
718 	if (!dev->board.ir_codes && !dev->board.has_ir_i2c) {
719 		/* No remote control support */
720 		dev_warn(&dev->intf->dev,
721 			 "Remote control support is not available for this card.\n");
722 		return 0;
723 	}
724 
725 	dev_info(&dev->intf->dev, "Registering input extension\n");
726 
727 	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
728 	if (!ir)
729 		goto ref_put;
730 	rc = rc_allocate_device(RC_DRIVER_SCANCODE);
731 	if (!rc)
732 		goto error;
733 
734 	/* record handles to ourself */
735 	ir->dev = dev;
736 	dev->ir = ir;
737 	ir->rc = rc;
738 
739 	rc->priv = ir;
740 	rc->open = em28xx_ir_start;
741 	rc->close = em28xx_ir_stop;
742 
743 	if (dev->board.has_ir_i2c) {	/* external i2c device */
744 		switch (dev->model) {
745 		case EM2800_BOARD_TERRATEC_CINERGY_200:
746 		case EM2820_BOARD_TERRATEC_CINERGY_250:
747 			rc->map_name = RC_MAP_EM_TERRATEC;
748 			ir->get_key_i2c = em28xx_get_key_terratec;
749 			break;
750 		case EM2820_BOARD_PINNACLE_USB_2:
751 			rc->map_name = RC_MAP_PINNACLE_GREY;
752 			ir->get_key_i2c = em28xx_get_key_pinnacle_usb_grey;
753 			break;
754 		case EM2820_BOARD_HAUPPAUGE_WINTV_USB_2:
755 			rc->map_name = RC_MAP_HAUPPAUGE;
756 			ir->get_key_i2c = em28xx_get_key_em_haup;
757 			rc->allowed_protocols = RC_PROTO_BIT_RC5;
758 			break;
759 		case EM2820_BOARD_LEADTEK_WINFAST_USBII_DELUXE:
760 			rc->map_name = RC_MAP_WINFAST_USBII_DELUXE;
761 			ir->get_key_i2c = em28xx_get_key_winfast_usbii_deluxe;
762 			break;
763 		default:
764 			err = -ENODEV;
765 			goto error;
766 		}
767 
768 		ir->i2c_client = kzalloc(sizeof(*ir->i2c_client), GFP_KERNEL);
769 		if (!ir->i2c_client)
770 			goto error;
771 		ir->i2c_client->adapter = &ir->dev->i2c_adap[dev->def_i2c_bus];
772 		ir->i2c_client->addr = i2c_rc_dev_addr;
773 		ir->i2c_client->flags = 0;
774 		/* NOTE: all other fields of i2c_client are unused */
775 	} else {	/* internal device */
776 		switch (dev->chip_id) {
777 		case CHIP_ID_EM2860:
778 		case CHIP_ID_EM2883:
779 			rc->allowed_protocols = RC_PROTO_BIT_RC5 |
780 						RC_PROTO_BIT_NEC;
781 			ir->get_key = default_polling_getkey;
782 			break;
783 		case CHIP_ID_EM2884:
784 		case CHIP_ID_EM2874:
785 		case CHIP_ID_EM28174:
786 		case CHIP_ID_EM28178:
787 			ir->get_key = em2874_polling_getkey;
788 			rc->allowed_protocols = RC_PROTO_BIT_RC5 |
789 				RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX |
790 				RC_PROTO_BIT_NEC32 | RC_PROTO_BIT_RC6_0;
791 			break;
792 		default:
793 			err = -ENODEV;
794 			goto error;
795 		}
796 
797 		rc->change_protocol = em28xx_ir_change_protocol;
798 		rc->map_name = dev->board.ir_codes;
799 
800 		/* By default, keep protocol field untouched */
801 		rc_proto = RC_PROTO_BIT_UNKNOWN;
802 		err = em28xx_ir_change_protocol(rc, &rc_proto);
803 		if (err)
804 			goto error;
805 	}
806 
807 	/* This is how often we ask the chip for IR information */
808 	ir->polling = 100; /* ms */
809 
810 	usb_make_path(udev, ir->phys, sizeof(ir->phys));
811 	strlcat(ir->phys, "/input0", sizeof(ir->phys));
812 
813 	rc->device_name = em28xx_boards[dev->model].name;
814 	rc->input_phys = ir->phys;
815 	usb_to_input_id(udev, &rc->input_id);
816 	rc->dev.parent = &dev->intf->dev;
817 	rc->driver_name = MODULE_NAME;
818 
819 	/* all done */
820 	err = rc_register_device(rc);
821 	if (err)
822 		goto error;
823 
824 	dev_info(&dev->intf->dev, "Input extension successfully initialized\n");
825 
826 	return 0;
827 
828 error:
829 	kfree(ir->i2c_client);
830 	dev->ir = NULL;
831 	rc_free_device(rc);
832 	kfree(ir);
833 ref_put:
834 	em28xx_shutdown_buttons(dev);
835 	return err;
836 }
837 
838 static int em28xx_ir_fini(struct em28xx *dev)
839 {
840 	struct em28xx_IR *ir = dev->ir;
841 
842 	if (dev->is_audio_only) {
843 		/* Shouldn't initialize IR for this interface */
844 		return 0;
845 	}
846 
847 	dev_info(&dev->intf->dev, "Closing input extension\n");
848 
849 	em28xx_shutdown_buttons(dev);
850 
851 	/* skip detach on non attached boards */
852 	if (!ir)
853 		goto ref_put;
854 
855 	rc_unregister_device(ir->rc);
856 
857 	kfree(ir->i2c_client);
858 
859 	/* done */
860 	kfree(ir);
861 	dev->ir = NULL;
862 
863 ref_put:
864 	kref_put(&dev->ref, em28xx_free_device);
865 
866 	return 0;
867 }
868 
869 static int em28xx_ir_suspend(struct em28xx *dev)
870 {
871 	struct em28xx_IR *ir = dev->ir;
872 
873 	if (dev->is_audio_only)
874 		return 0;
875 
876 	dev_info(&dev->intf->dev, "Suspending input extension\n");
877 	if (ir)
878 		cancel_delayed_work_sync(&ir->work);
879 	cancel_delayed_work_sync(&dev->buttons_query_work);
880 	/*
881 	 * is canceling delayed work sufficient or does the rc event
882 	 * kthread needs stopping? kthread is stopped in
883 	 * ir_raw_event_unregister()
884 	 */
885 	return 0;
886 }
887 
888 static int em28xx_ir_resume(struct em28xx *dev)
889 {
890 	struct em28xx_IR *ir = dev->ir;
891 
892 	if (dev->is_audio_only)
893 		return 0;
894 
895 	dev_info(&dev->intf->dev, "Resuming input extension\n");
896 	/*
897 	 * if suspend calls ir_raw_event_unregister(), the should call
898 	 * ir_raw_event_register()
899 	 */
900 	if (ir)
901 		schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
902 	if (dev->num_button_polling_addresses)
903 		schedule_delayed_work(&dev->buttons_query_work,
904 				      msecs_to_jiffies(dev->button_polling_interval));
905 	return 0;
906 }
907 
908 static struct em28xx_ops rc_ops = {
909 	.id   = EM28XX_RC,
910 	.name = "Em28xx Input Extension",
911 	.init = em28xx_ir_init,
912 	.fini = em28xx_ir_fini,
913 	.suspend = em28xx_ir_suspend,
914 	.resume = em28xx_ir_resume,
915 };
916 
917 static int __init em28xx_rc_register(void)
918 {
919 	return em28xx_register_extension(&rc_ops);
920 }
921 
922 static void __exit em28xx_rc_unregister(void)
923 {
924 	em28xx_unregister_extension(&rc_ops);
925 }
926 
927 MODULE_LICENSE("GPL v2");
928 MODULE_AUTHOR("Mauro Carvalho Chehab");
929 MODULE_DESCRIPTION(DRIVER_DESC " - input interface");
930 MODULE_VERSION(EM28XX_VERSION);
931 
932 module_init(em28xx_rc_register);
933 module_exit(em28xx_rc_unregister);
934