summaryrefslogtreecommitdiffstats
path: root/sound/soc/omap/omap-hdmi-audio.c
blob: ccfb41c22e53b11cedbf5d8272a56a757ad283d1 (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
397
398
399
400
401
402
403
404
405
406
/*
 * omap-hdmi-audio.c -- OMAP4+ DSS HDMI audio support library
 *
 * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
 *
 * Author: Jyri Sarha <jsarha@ti.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/platform_device.h>
#include <sound/soc.h>
#include <sound/pcm_params.h>
#include <sound/dmaengine_pcm.h>
#include <uapi/sound/asound.h>
#include <sound/asoundef.h>
#include <sound/omap-pcm.h>
#include <sound/omap-hdmi-audio.h>
#include <video/omapdss.h>

#define DRV_NAME "omap-hdmi-audio"

struct hdmi_audio_data {
	struct snd_soc_card *card;

	const struct omap_hdmi_audio_ops *ops;
	struct device *dssdev;
	struct snd_dmaengine_dai_dma_data dma_data;
	struct omap_dss_audio dss_audio;
	struct snd_aes_iec958 iec;
	struct snd_cea_861_aud_if cea;

	struct mutex current_stream_lock;
	struct snd_pcm_substream *current_stream;
};

static
struct hdmi_audio_data *card_drvdata_substream(struct snd_pcm_substream *ss)
{
	struct snd_soc_pcm_runtime *rtd = ss->private_data;

	return snd_soc_card_get_drvdata(rtd->card);
}

static void hdmi_dai_abort(struct device *dev)
{
	struct hdmi_audio_data *ad = dev_get_drvdata(dev);

	mutex_lock(&ad->current_stream_lock);
	if (ad->current_stream && ad->current_stream->runtime &&
	    snd_pcm_running(ad->current_stream)) {
		dev_err(dev, "HDMI display disabled, aborting playback\n");
		snd_pcm_stream_lock_irq(ad->current_stream);
		snd_pcm_stop(ad->current_stream, SNDRV_PCM_STATE_DISCONNECTED);
		snd_pcm_stream_unlock_irq(ad->current_stream);
	}
	mutex_unlock(&ad->current_stream_lock);
}

static int hdmi_dai_startup(struct snd_pcm_substream *substream,
			    struct snd_soc_dai *dai)
{
	struct hdmi_audio_data *ad = card_drvdata_substream(substream);
	int ret;
	/*
	 * Make sure that the period bytes are multiple of the DMA packet size.
	 * Largest packet size we use is 32 32-bit words = 128 bytes
	 */
	ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
					 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
	if (ret < 0) {
		dev_err(dai->dev, "could not apply constraint\n");
		return ret;
	}

	snd_soc_dai_set_dma_data(dai, substream, &ad->dma_data);

	mutex_lock(&ad->current_stream_lock);
	ad->current_stream = substream;
	mutex_unlock(&ad->current_stream_lock);

	ret = ad->ops->audio_startup(ad->dssdev, hdmi_dai_abort);

	if (ret) {
		mutex_lock(&ad->current_stream_lock);
		ad->current_stream = NULL;
		mutex_unlock(&ad->current_stream_lock);
	}

	return ret;
}

static int hdmi_dai_hw_params(struct snd_pcm_substream *substream,
			      struct snd_pcm_hw_params *params,
			      struct snd_soc_dai *dai)
{
	struct hdmi_audio_data *ad = card_drvdata_substream(substream);
	struct snd_aes_iec958 *iec = &ad->iec;
	struct snd_cea_861_aud_if *cea = &ad->cea;

	WARN_ON(ad->current_stream != substream);

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		ad->dma_data.maxburst = 16;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		ad->dma_data.maxburst = 32;
		break;
	default:
		dev_err(dai->dev, "format not supported!\n");
		return -EINVAL;
	}

	ad->dss_audio.iec = iec;
	ad->dss_audio.cea = cea;
	/*
	 * fill the IEC-60958 channel status word
	 */
	/* initialize the word bytes */
	memset(iec->status, 0, sizeof(iec->status));

	/* specify IEC-60958-3 (commercial use) */
	iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;

	/* specify that the audio is LPCM*/
	iec->status[0] &= ~IEC958_AES0_NONAUDIO;

	iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;

	iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;

	iec->status[0] |= IEC958_AES1_PRO_MODE_NOTID;

	iec->status[1] = IEC958_AES1_CON_GENERAL;

	iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;

	iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;

	switch (params_rate(params)) {
	case 32000:
		iec->status[3] |= IEC958_AES3_CON_FS_32000;
		break;
	case 44100:
		iec->status[3] |= IEC958_AES3_CON_FS_44100;
		break;
	case 48000:
		iec->status[3] |= IEC958_AES3_CON_FS_48000;
		break;
	case 88200:
		iec->status[3] |= IEC958_AES3_CON_FS_88200;
		break;
	case 96000:
		iec->status[3] |= IEC958_AES3_CON_FS_96000;
		break;
	case 176400:
		iec->status[3] |= IEC958_AES3_CON_FS_176400;
		break;
	case 192000:
		iec->status[3] |= IEC958_AES3_CON_FS_192000;
		break;
	default:
		dev_err(dai->dev, "rate not supported!\n");
		return -EINVAL;
	}

	/* specify the clock accuracy */
	iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;

	/*
	 * specify the word length. The same word length value can mean
	 * two different lengths. Hence, we need to specify the maximum
	 * word length as well.
	 */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
		iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
		iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
		break;
	default:
		dev_err(dai->dev, "format not supported!\n");
		return -EINVAL;
	}

	/*
	 * Fill the CEA-861 audio infoframe (see spec for details)
	 */

	cea->db1_ct_cc = (params_channels(params) - 1)
		& CEA861_AUDIO_INFOFRAME_DB1CC;
	cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;

	cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
	cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;

	cea->db3 = 0; /* not used, all zeros */

	/*
	 * The OMAP HDMI IP requires to use the 8-channel channel code when
	 * transmitting more than two channels.
	 */
	if (params_channels(params) == 2)
		cea->db4_ca = 0x0;
	else
		cea->db4_ca = 0x13;

	cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
	/* the expression is trivial but makes clear what we are doing */
	cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);

	return ad->ops->audio_config(ad->dssdev, &ad->dss_audio);
}

static int hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
			    struct snd_soc_dai *dai)
{
	struct hdmi_audio_data *ad = card_drvdata_substream(substream);
	int err = 0;

	WARN_ON(ad->current_stream != substream);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		err = ad->ops->audio_start(ad->dssdev);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		ad->ops->audio_stop(ad->dssdev);
		break;
	default:
		err = -EINVAL;
	}
	return err;
}

static void hdmi_dai_shutdown(struct snd_pcm_substream *substream,
			      struct snd_soc_dai *dai)
{
	struct hdmi_audio_data *ad = card_drvdata_substream(substream);

	WARN_ON(ad->current_stream != substream);

	ad->ops->audio_shutdown(ad->dssdev);

	mutex_lock(&ad->current_stream_lock);
	ad->current_stream = NULL;
	mutex_unlock(&ad->current_stream_lock);
}

static const struct snd_soc_dai_ops hdmi_dai_ops = {
	.startup	= hdmi_dai_startup,
	.hw_params	= hdmi_dai_hw_params,
	.trigger	= hdmi_dai_trigger,
	.shutdown	= hdmi_dai_shutdown,
};

static const struct snd_soc_component_driver omap_hdmi_component = {
	.name = "omapdss_hdmi",
};

static struct snd_soc_dai_driver omap5_hdmi_dai = {
	.name = "omap5-hdmi-dai",
	.playback = {
		.channels_min = 2,
		.channels_max = 8,
		.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
			  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
			  SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
			  SNDRV_PCM_RATE_192000),
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.ops = &hdmi_dai_ops,
};

static struct snd_soc_dai_driver omap4_hdmi_dai = {
	.name = "omap4-hdmi-dai",
	.playback = {
		.channels_min = 2,
		.channels_max = 8,
		.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
			  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
			  SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
			  SNDRV_PCM_RATE_192000),
		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
	},
	.ops = &hdmi_dai_ops,
};

static int omap_hdmi_audio_probe(struct platform_device *pdev)
{
	struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data;
	struct device *dev = &pdev->dev;
	struct hdmi_audio_data *ad;
	struct snd_soc_dai_driver *dai_drv;
	struct snd_soc_card *card;
	int ret;

	if (!ha) {
		dev_err(dev, "No platform data\n");
		return -EINVAL;
	}

	ad = devm_kzalloc(dev, sizeof(*ad), GFP_KERNEL);
	if (!ad)
		return -ENOMEM;
	ad->dssdev = ha->dev;
	ad->ops = ha->ops;
	ad->dma_data.addr = ha->audio_dma_addr;
	ad->dma_data.filter_data = "audio_tx";
	ad->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
	mutex_init(&ad->current_stream_lock);

	switch (ha->dss_version) {
	case OMAPDSS_VER_OMAP4430_ES1:
	case OMAPDSS_VER_OMAP4430_ES2:
	case OMAPDSS_VER_OMAP4:
		dai_drv = &omap4_hdmi_dai;
		break;
	case OMAPDSS_VER_OMAP5:
		dai_drv = &omap5_hdmi_dai;
		break;
	default:
		return -EINVAL;
	}
	ret = snd_soc_register_component(ad->dssdev, &omap_hdmi_component,
					 dai_drv, 1);
	if (ret)
		return ret;

	ret = omap_pcm_platform_register(ad->dssdev);
	if (ret)
		return ret;

	card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
	card->name = devm_kasprintf(dev, GFP_KERNEL,
				    "HDMI %s", dev_name(ad->dssdev));
	card->owner = THIS_MODULE;
	card->dai_link =
		devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL);
	card->dai_link->name = card->name;
	card->dai_link->stream_name = card->name;
	card->dai_link->cpu_dai_name = dev_name(ad->dssdev);
	card->dai_link->platform_name = dev_name(ad->dssdev);
	card->dai_link->codec_name = "snd-soc-dummy";
	card->dai_link->codec_dai_name = "snd-soc-dummy-dai";
	card->num_links = 1;
	card->dev = dev;

	ret = snd_soc_register_card(card);
	if (ret) {
		dev_err(dev, "snd_soc_register_card failed (%d)\n", ret);
		snd_soc_unregister_component(ad->dssdev);
		return ret;
	}

	ad->card = card;
	snd_soc_card_set_drvdata(card, ad);

	dev_set_drvdata(dev, ad);

	return 0;
}

static int omap_hdmi_audio_remove(struct platform_device *pdev)
{
	struct hdmi_audio_data *ad = platform_get_drvdata(pdev);

	snd_soc_unregister_card(ad->card);
	snd_soc_unregister_component(ad->dssdev);
	return 0;
}

static struct platform_driver hdmi_audio_driver = {
	.driver = {
		.name = DRV_NAME,
	},
	.probe = omap_hdmi_audio_probe,
	.remove = omap_hdmi_audio_remove,
};

module_platform_driver(hdmi_audio_driver);

MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
MODULE_DESCRIPTION("OMAP HDMI Audio Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
OpenPOWER on IntegriCloud