summaryrefslogtreecommitdiffstats
path: root/drivers/media/usb/dvb-usb/dvb-usb-remote.c
blob: 701c10835482c90f46e121af081f496ecdf53989 (plain)
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
// SPDX-License-Identifier: GPL-2.0
/* dvb-usb-remote.c is part of the DVB USB library.
 *
 * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@posteo.de)
 * see dvb-usb-init.c for copyright information.
 *
 * This file contains functions for initializing the input-device and for handling remote-control-queries.
 */
#include "dvb-usb-common.h"
#include <linux/usb/input.h>

static unsigned int
legacy_dvb_usb_get_keymap_index(const struct input_keymap_entry *ke,
				struct rc_map_table *keymap,
				unsigned int keymap_size)
{
	unsigned int index;
	unsigned int scancode;

	if (ke->flags & INPUT_KEYMAP_BY_INDEX) {
		index = ke->index;
	} else {
		if (input_scancode_to_scalar(ke, &scancode))
			return keymap_size;

		/* See if we can match the raw key code. */
		for (index = 0; index < keymap_size; index++)
			if (keymap[index].scancode == scancode)
				break;

		/* See if there is an unused hole in the map */
		if (index >= keymap_size) {
			for (index = 0; index < keymap_size; index++) {
				if (keymap[index].keycode == KEY_RESERVED ||
				    keymap[index].keycode == KEY_UNKNOWN) {
					break;
				}
			}
		}
	}

	return index;
}

static int legacy_dvb_usb_getkeycode(struct input_dev *dev,
				     struct input_keymap_entry *ke)
{
	struct dvb_usb_device *d = input_get_drvdata(dev);
	struct rc_map_table *keymap = d->props.rc.legacy.rc_map_table;
	unsigned int keymap_size = d->props.rc.legacy.rc_map_size;
	unsigned int index;

	index = legacy_dvb_usb_get_keymap_index(ke, keymap, keymap_size);
	if (index >= keymap_size)
		return -EINVAL;

	ke->keycode = keymap[index].keycode;
	if (ke->keycode == KEY_UNKNOWN)
		ke->keycode = KEY_RESERVED;
	ke->len = sizeof(keymap[index].scancode);
	memcpy(&ke->scancode, &keymap[index].scancode, ke->len);
	ke->index = index;

	return 0;
}

static int legacy_dvb_usb_setkeycode(struct input_dev *dev,
				     const struct input_keymap_entry *ke,
				     unsigned int *old_keycode)
{
	struct dvb_usb_device *d = input_get_drvdata(dev);
	struct rc_map_table *keymap = d->props.rc.legacy.rc_map_table;
	unsigned int keymap_size = d->props.rc.legacy.rc_map_size;
	unsigned int index;

	index = legacy_dvb_usb_get_keymap_index(ke, keymap, keymap_size);
	/*
	 * FIXME: Currently, it is not possible to increase the size of
	 * scancode table. For it to happen, one possibility
	 * would be to allocate a table with key_map_size + 1,
	 * copying data, appending the new key on it, and freeing
	 * the old one - or maybe just allocating some spare space
	 */
	if (index >= keymap_size)
		return -EINVAL;

	*old_keycode = keymap[index].keycode;
	keymap->keycode = ke->keycode;
	__set_bit(ke->keycode, dev->keybit);

	if (*old_keycode != KEY_RESERVED) {
		__clear_bit(*old_keycode, dev->keybit);
		for (index = 0; index < keymap_size; index++) {
			if (keymap[index].keycode == *old_keycode) {
				__set_bit(*old_keycode, dev->keybit);
				break;
			}
		}
	}

	return 0;
}

/* Remote-control poll function - called every dib->rc_query_interval ms to see
 * whether the remote control has received anything.
 *
 * TODO: Fix the repeat rate of the input device.
 */
static void legacy_dvb_usb_read_remote_control(struct work_struct *work)
{
	struct dvb_usb_device *d =
		container_of(work, struct dvb_usb_device, rc_query_work.work);
	u32 event;
	int state;

	/* TODO: need a lock here.  We can simply skip checking for the remote control
	   if we're busy. */

	/* when the parameter has been set to 1 via sysfs while the driver was running */
	if (dvb_usb_disable_rc_polling)
		return;

	if (d->props.rc.legacy.rc_query(d,&event,&state)) {
		err("error while querying for an remote control event.");
		goto schedule;
	}


	switch (state) {
		case REMOTE_NO_KEY_PRESSED:
			break;
		case REMOTE_KEY_PRESSED:
			deb_rc("key pressed\n");
			d->last_event = event;
			input_event(d->input_dev, EV_KEY, event, 1);
			input_sync(d->input_dev);
			input_event(d->input_dev, EV_KEY, d->last_event, 0);
			input_sync(d->input_dev);
			break;
		case REMOTE_KEY_REPEAT:
			deb_rc("key repeated\n");
			input_event(d->input_dev, EV_KEY, event, 1);
			input_sync(d->input_dev);
			input_event(d->input_dev, EV_KEY, d->last_event, 0);
			input_sync(d->input_dev);
			break;
		default:
			break;
	}

/* improved repeat handling ???
	switch (state) {
		case REMOTE_NO_KEY_PRESSED:
			deb_rc("NO KEY PRESSED\n");
			if (d->last_state != REMOTE_NO_KEY_PRESSED) {
				deb_rc("releasing event %d\n",d->last_event);
				input_event(d->rc_input_dev, EV_KEY, d->last_event, 0);
				input_sync(d->rc_input_dev);
			}
			d->last_state = REMOTE_NO_KEY_PRESSED;
			d->last_event = 0;
			break;
		case REMOTE_KEY_PRESSED:
			deb_rc("KEY PRESSED\n");
			deb_rc("pressing event %d\n",event);

			input_event(d->rc_input_dev, EV_KEY, event, 1);
			input_sync(d->rc_input_dev);

			d->last_event = event;
			d->last_state = REMOTE_KEY_PRESSED;
			break;
		case REMOTE_KEY_REPEAT:
			deb_rc("KEY_REPEAT\n");
			if (d->last_state != REMOTE_NO_KEY_PRESSED) {
				deb_rc("repeating event %d\n",d->last_event);
				input_event(d->rc_input_dev, EV_KEY, d->last_event, 2);
				input_sync(d->rc_input_dev);
				d->last_state = REMOTE_KEY_REPEAT;
			}
		default:
			break;
	}
*/

schedule:
	schedule_delayed_work(&d->rc_query_work,msecs_to_jiffies(d->props.rc.legacy.rc_interval));
}

static int legacy_dvb_usb_remote_init(struct dvb_usb_device *d)
{
	int i, err, rc_interval;
	struct input_dev *input_dev;

	input_dev = input_allocate_device();
	if (!input_dev)
		return -ENOMEM;

	input_dev->evbit[0] = BIT_MASK(EV_KEY);
	input_dev->name = "IR-receiver inside an USB DVB receiver";
	input_dev->phys = d->rc_phys;
	usb_to_input_id(d->udev, &input_dev->id);
	input_dev->dev.parent = &d->udev->dev;
	d->input_dev = input_dev;
	d->rc_dev = NULL;

	input_dev->getkeycode = legacy_dvb_usb_getkeycode;
	input_dev->setkeycode = legacy_dvb_usb_setkeycode;

	/* set the bits for the keys */
	deb_rc("key map size: %d\n", d->props.rc.legacy.rc_map_size);
	for (i = 0; i < d->props.rc.legacy.rc_map_size; i++) {
		deb_rc("setting bit for event %d item %d\n",
			d->props.rc.legacy.rc_map_table[i].keycode, i);
		set_bit(d->props.rc.legacy.rc_map_table[i].keycode, input_dev->keybit);
	}

	/* setting these two values to non-zero, we have to manage key repeats */
	input_dev->rep[REP_PERIOD] = d->props.rc.legacy.rc_interval;
	input_dev->rep[REP_DELAY]  = d->props.rc.legacy.rc_interval + 150;

	input_set_drvdata(input_dev, d);

	err = input_register_device(input_dev);
	if (err)
		input_free_device(input_dev);

	rc_interval = d->props.rc.legacy.rc_interval;

	INIT_DELAYED_WORK(&d->rc_query_work, legacy_dvb_usb_read_remote_control);

	info("schedule remote query interval to %d msecs.", rc_interval);
	schedule_delayed_work(&d->rc_query_work,
			      msecs_to_jiffies(rc_interval));

	d->state |= DVB_USB_STATE_REMOTE;

	return err;
}

/* Remote-control poll function - called every dib->rc_query_interval ms to see
 * whether the remote control has received anything.
 *
 * TODO: Fix the repeat rate of the input device.
 */
static void dvb_usb_read_remote_control(struct work_struct *work)
{
	struct dvb_usb_device *d =
		container_of(work, struct dvb_usb_device, rc_query_work.work);
	int err;

	/* TODO: need a lock here.  We can simply skip checking for the remote control
	   if we're busy. */

	/* when the parameter has been set to 1 via sysfs while the
	 * driver was running, or when bulk mode is enabled after IR init
	 */
	if (dvb_usb_disable_rc_polling || d->props.rc.core.bulk_mode)
		return;

	err = d->props.rc.core.rc_query(d);
	if (err)
		err("error %d while querying for an remote control event.", err);

	schedule_delayed_work(&d->rc_query_work,
			      msecs_to_jiffies(d->props.rc.core.rc_interval));
}

static int rc_core_dvb_usb_remote_init(struct dvb_usb_device *d)
{
	int err, rc_interval;
	struct rc_dev *dev;

	dev = rc_allocate_device(d->props.rc.core.driver_type);
	if (!dev)
		return -ENOMEM;

	dev->driver_name = d->props.rc.core.module_name;
	dev->map_name = d->props.rc.core.rc_codes;
	dev->change_protocol = d->props.rc.core.change_protocol;
	dev->allowed_protocols = d->props.rc.core.allowed_protos;
	usb_to_input_id(d->udev, &dev->input_id);
	dev->device_name = "IR-receiver inside an USB DVB receiver";
	dev->input_phys = d->rc_phys;
	dev->dev.parent = &d->udev->dev;
	dev->priv = d;

	err = rc_register_device(dev);
	if (err < 0) {
		rc_free_device(dev);
		return err;
	}

	d->input_dev = NULL;
	d->rc_dev = dev;

	if (!d->props.rc.core.rc_query || d->props.rc.core.bulk_mode)
		return 0;

	/* Polling mode - initialize a work queue for handling it */
	INIT_DELAYED_WORK(&d->rc_query_work, dvb_usb_read_remote_control);

	rc_interval = d->props.rc.core.rc_interval;

	info("schedule remote query interval to %d msecs.", rc_interval);
	schedule_delayed_work(&d->rc_query_work,
			      msecs_to_jiffies(rc_interval));

	return 0;
}

int dvb_usb_remote_init(struct dvb_usb_device *d)
{
	int err;

	if (dvb_usb_disable_rc_polling)
		return 0;

	if (d->props.rc.legacy.rc_map_table && d->props.rc.legacy.rc_query)
		d->props.rc.mode = DVB_RC_LEGACY;
	else if (d->props.rc.core.rc_codes)
		d->props.rc.mode = DVB_RC_CORE;
	else
		return 0;

	usb_make_path(d->udev, d->rc_phys, sizeof(d->rc_phys));
	strlcat(d->rc_phys, "/ir0", sizeof(d->rc_phys));

	/* Start the remote-control polling. */
	if (d->props.rc.legacy.rc_interval < 40)
		d->props.rc.legacy.rc_interval = 100; /* default */

	if (d->props.rc.mode == DVB_RC_LEGACY)
		err = legacy_dvb_usb_remote_init(d);
	else
		err = rc_core_dvb_usb_remote_init(d);
	if (err)
		return err;

	d->state |= DVB_USB_STATE_REMOTE;

	return 0;
}

int dvb_usb_remote_exit(struct dvb_usb_device *d)
{
	if (d->state & DVB_USB_STATE_REMOTE) {
		cancel_delayed_work_sync(&d->rc_query_work);
		if (d->props.rc.mode == DVB_RC_LEGACY)
			input_unregister_device(d->input_dev);
		else
			rc_unregister_device(d->rc_dev);
	}
	d->state &= ~DVB_USB_STATE_REMOTE;
	return 0;
}

#define DVB_USB_RC_NEC_EMPTY           0x00
#define DVB_USB_RC_NEC_KEY_PRESSED     0x01
#define DVB_USB_RC_NEC_KEY_REPEATED    0x02
int dvb_usb_nec_rc_key_to_event(struct dvb_usb_device *d,
		u8 keybuf[5], u32 *event, int *state)
{
	int i;
	struct rc_map_table *keymap = d->props.rc.legacy.rc_map_table;
	*event = 0;
	*state = REMOTE_NO_KEY_PRESSED;
	switch (keybuf[0]) {
		case DVB_USB_RC_NEC_EMPTY:
			break;
		case DVB_USB_RC_NEC_KEY_PRESSED:
			if ((u8) ~keybuf[1] != keybuf[2] ||
				(u8) ~keybuf[3] != keybuf[4]) {
				deb_err("remote control checksum failed.\n");
				break;
			}
			/* See if we can match the raw key code. */
			for (i = 0; i < d->props.rc.legacy.rc_map_size; i++)
				if (rc5_custom(&keymap[i]) == keybuf[1] &&
					rc5_data(&keymap[i]) == keybuf[3]) {
					*event = keymap[i].keycode;
					*state = REMOTE_KEY_PRESSED;
					return 0;
				}
			deb_err("key mapping failed - no appropriate key found in keymapping\n");
			break;
		case DVB_USB_RC_NEC_KEY_REPEATED:
			*state = REMOTE_KEY_REPEAT;
			break;
		default:
			deb_err("unknown type of remote status: %d\n",keybuf[0]);
			break;
	}
	return 0;
}
EXPORT_SYMBOL(dvb_usb_nec_rc_key_to_event);