summaryrefslogtreecommitdiff
path: root/sound/usb/media.c
blob: 840f42cb9272c43ec007e99ad823b88007c44b8f (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
// SPDX-License-Identifier: GPL-2.0
/*
 * media.c - Media Controller specific ALSA driver code
 *
 * Copyright (c) 2019 Shuah Khan <shuah@kernel.org>
 *
 */

/*
 * This file adds Media Controller support to the ALSA driver
 * to use the Media Controller API to share the tuner with DVB
 * and V4L2 drivers that control the media device.
 *
 * The media device is created based on the existing quirks framework.
 * Using this approach, the media controller API usage can be added for
 * a specific device.
 */

#include <linux/init.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/usb.h>

#include <sound/pcm.h>
#include <sound/core.h>

#include "usbaudio.h"
#include "card.h"
#include "mixer.h"
#include "media.h"

int snd_media_stream_init(struct snd_usb_substream *subs, struct snd_pcm *pcm,
			  int stream)
{
	struct media_device *mdev;
	struct media_ctl *mctl;
	struct device *pcm_dev = &pcm->streams[stream].dev;
	u32 intf_type;
	int ret = 0;
	u16 mixer_pad;
	struct media_entity *entity;

	mdev = subs->stream->chip->media_dev;
	if (!mdev)
		return 0;

	if (subs->media_ctl)
		return 0;

	/* allocate media_ctl */
	mctl = kzalloc(sizeof(*mctl), GFP_KERNEL);
	if (!mctl)
		return -ENOMEM;

	mctl->media_dev = mdev;
	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
		intf_type = MEDIA_INTF_T_ALSA_PCM_PLAYBACK;
		mctl->media_entity.function = MEDIA_ENT_F_AUDIO_PLAYBACK;
		mctl->media_pad.flags = MEDIA_PAD_FL_SOURCE;
		mixer_pad = 1;
	} else {
		intf_type = MEDIA_INTF_T_ALSA_PCM_CAPTURE;
		mctl->media_entity.function = MEDIA_ENT_F_AUDIO_CAPTURE;
		mctl->media_pad.flags = MEDIA_PAD_FL_SINK;
		mixer_pad = 2;
	}
	mctl->media_entity.name = pcm->name;
	media_entity_pads_init(&mctl->media_entity, 1, &mctl->media_pad);
	ret =  media_device_register_entity(mctl->media_dev,
					    &mctl->media_entity);
	if (ret)
		goto free_mctl;

	mctl->intf_devnode = media_devnode_create(mdev, intf_type, 0,
						  MAJOR(pcm_dev->devt),
						  MINOR(pcm_dev->devt));
	if (!mctl->intf_devnode) {
		ret = -ENOMEM;
		goto unregister_entity;
	}
	mctl->intf_link = media_create_intf_link(&mctl->media_entity,
						 &mctl->intf_devnode->intf,
						 MEDIA_LNK_FL_ENABLED);
	if (!mctl->intf_link) {
		ret = -ENOMEM;
		goto devnode_remove;
	}

	/* create link between mixer and audio */
	media_device_for_each_entity(entity, mdev) {
		switch (entity->function) {
		case MEDIA_ENT_F_AUDIO_MIXER:
			ret = media_create_pad_link(entity, mixer_pad,
						    &mctl->media_entity, 0,
						    MEDIA_LNK_FL_ENABLED);
			if (ret)
				goto remove_intf_link;
			break;
		}
	}

	subs->media_ctl = mctl;
	return 0;

remove_intf_link:
	media_remove_intf_link(mctl->intf_link);
devnode_remove:
	media_devnode_remove(mctl->intf_devnode);
unregister_entity:
	media_device_unregister_entity(&mctl->media_entity);
free_mctl:
	kfree(mctl);
	return ret;
}

void snd_media_stream_delete(struct snd_usb_substream *subs)
{
	struct media_ctl *mctl = subs->media_ctl;

	if (mctl) {
		struct media_device *mdev;

		mdev = mctl->media_dev;
		if (mdev && media_devnode_is_registered(mdev->devnode)) {
			media_devnode_remove(mctl->intf_devnode);
			media_device_unregister_entity(&mctl->media_entity);
			media_entity_cleanup(&mctl->media_entity);
		}
		kfree(mctl);
		subs->media_ctl = NULL;
	}
}

int snd_media_start_pipeline(struct snd_usb_substream *subs)
{
	struct media_ctl *mctl = subs->media_ctl;
	int ret = 0;

	if (!mctl)
		return 0;

	mutex_lock(&mctl->media_dev->graph_mutex);
	if (mctl->media_dev->enable_source)
		ret = mctl->media_dev->enable_source(&mctl->media_entity,
						     &mctl->media_pipe);
	mutex_unlock(&mctl->media_dev->graph_mutex);
	return ret;
}

void snd_media_stop_pipeline(struct snd_usb_substream *subs)
{
	struct media_ctl *mctl = subs->media_ctl;

	if (!mctl)
		return;

	mutex_lock(&mctl->media_dev->graph_mutex);
	if (mctl->media_dev->disable_source)
		mctl->media_dev->disable_source(&mctl->media_entity);
	mutex_unlock(&mctl->media_dev->graph_mutex);
}

static int snd_media_mixer_init(struct snd_usb_audio *chip)
{
	struct device *ctl_dev = &chip->card->ctl_dev;
	struct media_intf_devnode *ctl_intf;
	struct usb_mixer_interface *mixer;
	struct media_device *mdev = chip->media_dev;
	struct media_mixer_ctl *mctl;
	u32 intf_type = MEDIA_INTF_T_ALSA_CONTROL;
	int ret;

	if (!mdev)
		return -ENODEV;

	ctl_intf = chip->ctl_intf_media_devnode;
	if (!ctl_intf) {
		ctl_intf = media_devnode_create(mdev, intf_type, 0,
						MAJOR(ctl_dev->devt),
						MINOR(ctl_dev->devt));
		if (!ctl_intf)
			return -ENOMEM;
		chip->ctl_intf_media_devnode = ctl_intf;
	}

	list_for_each_entry(mixer, &chip->mixer_list, list) {

		if (mixer->media_mixer_ctl)
			continue;

		/* allocate media_mixer_ctl */
		mctl = kzalloc(sizeof(*mctl), GFP_KERNEL);
		if (!mctl)
			return -ENOMEM;

		mctl->media_dev = mdev;
		mctl->media_entity.function = MEDIA_ENT_F_AUDIO_MIXER;
		mctl->media_entity.name = chip->card->mixername;
		mctl->media_pad[0].flags = MEDIA_PAD_FL_SINK;
		mctl->media_pad[1].flags = MEDIA_PAD_FL_SOURCE;
		mctl->media_pad[2].flags = MEDIA_PAD_FL_SOURCE;
		media_entity_pads_init(&mctl->media_entity, MEDIA_MIXER_PAD_MAX,
				  mctl->media_pad);
		ret =  media_device_register_entity(mctl->media_dev,
						    &mctl->media_entity);
		if (ret) {
			kfree(mctl);
			return ret;
		}

		mctl->intf_link = media_create_intf_link(&mctl->media_entity,
							 &ctl_intf->intf,
							 MEDIA_LNK_FL_ENABLED);
		if (!mctl->intf_link) {
			media_device_unregister_entity(&mctl->media_entity);
			media_entity_cleanup(&mctl->media_entity);
			kfree(mctl);
			return -ENOMEM;
		}
		mctl->intf_devnode = ctl_intf;
		mixer->media_mixer_ctl = mctl;
	}
	return 0;
}

static void snd_media_mixer_delete(struct snd_usb_audio *chip)
{
	struct usb_mixer_interface *mixer;
	struct media_device *mdev = chip->media_dev;

	if (!mdev)
		return;

	list_for_each_entry(mixer, &chip->mixer_list, list) {
		struct media_mixer_ctl *mctl;

		mctl = mixer->media_mixer_ctl;
		if (!mixer->media_mixer_ctl)
			continue;

		if (media_devnode_is_registered(mdev->devnode)) {
			media_device_unregister_entity(&mctl->media_entity);
			media_entity_cleanup(&mctl->media_entity);
		}
		kfree(mctl);
		mixer->media_mixer_ctl = NULL;
	}
	if (media_devnode_is_registered(mdev->devnode))
		media_devnode_remove(chip->ctl_intf_media_devnode);
	chip->ctl_intf_media_devnode = NULL;
}

int snd_media_device_create(struct snd_usb_audio *chip,
			struct usb_interface *iface)
{
	struct media_device *mdev;
	struct usb_device *usbdev = interface_to_usbdev(iface);
	int ret = 0;

	/* usb-audio driver is probed for each usb interface, and
	 * there are multiple interfaces per device. Avoid calling
	 * media_device_usb_allocate() each time usb_audio_probe()
	 * is called. Do it only once.
	 */
	if (chip->media_dev) {
		mdev = chip->media_dev;
		goto snd_mixer_init;
	}

	mdev = media_device_usb_allocate(usbdev, KBUILD_MODNAME, THIS_MODULE);
	if (IS_ERR(mdev))
		return -ENOMEM;

	/* save media device - avoid lookups */
	chip->media_dev = mdev;

snd_mixer_init:
	/* Create media entities for mixer and control dev */
	ret = snd_media_mixer_init(chip);
	/* media_device might be registered, print error and continue */
	if (ret)
		dev_err(&usbdev->dev,
			"Couldn't create media mixer entities. Error: %d\n",
			ret);

	if (!media_devnode_is_registered(mdev->devnode)) {
		/* don't register if snd_media_mixer_init() failed */
		if (ret)
			goto create_fail;

		/* register media_device */
		ret = media_device_register(mdev);
create_fail:
		if (ret) {
			snd_media_mixer_delete(chip);
			media_device_delete(mdev, KBUILD_MODNAME, THIS_MODULE);
			/* clear saved media_dev */
			chip->media_dev = NULL;
			dev_err(&usbdev->dev,
				"Couldn't register media device. Error: %d\n",
				ret);
			return ret;
		}
	}

	return ret;
}

void snd_media_device_delete(struct snd_usb_audio *chip)
{
	struct media_device *mdev = chip->media_dev;
	struct snd_usb_stream *stream;

	/* release resources */
	list_for_each_entry(stream, &chip->pcm_list, list) {
		snd_media_stream_delete(&stream->substream[0]);
		snd_media_stream_delete(&stream->substream[1]);
	}

	snd_media_mixer_delete(chip);

	if (mdev) {
		media_device_delete(mdev, KBUILD_MODNAME, THIS_MODULE);
		chip->media_dev = NULL;
	}
}