2 * omap-hdmi-audio.c -- OMAP4+ DSS HDMI audio support library
4 * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
6 * Author: Jyri Sarha <jsarha@ti.com>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/err.h>
22 #include <linux/string.h>
23 #include <linux/platform_device.h>
24 #include <sound/soc.h>
25 #include <sound/pcm_params.h>
26 #include <sound/dmaengine_pcm.h>
27 #include <uapi/sound/asound.h>
28 #include <sound/asoundef.h>
29 #include <sound/omap-pcm.h>
30 #include <sound/omap-hdmi-audio.h>
31 #include <video/omapdss.h>
33 #define DRV_NAME "omap-hdmi-audio"
35 struct hdmi_audio_data {
36 struct snd_soc_card *card;
38 const struct omap_hdmi_audio_ops *ops;
39 struct device *dssdev;
40 struct snd_dmaengine_dai_dma_data dma_data;
41 struct omap_dss_audio dss_audio;
42 struct snd_aes_iec958 iec;
43 struct snd_cea_861_aud_if cea;
45 struct mutex current_stream_lock;
46 struct snd_pcm_substream *current_stream;
50 struct hdmi_audio_data *card_drvdata_substream(struct snd_pcm_substream *ss)
52 struct snd_soc_pcm_runtime *rtd = ss->private_data;
54 return snd_soc_card_get_drvdata(rtd->card);
57 static void hdmi_dai_abort(struct device *dev)
59 struct hdmi_audio_data *ad = dev_get_drvdata(dev);
61 mutex_lock(&ad->current_stream_lock);
62 if (ad->current_stream && ad->current_stream->runtime &&
63 snd_pcm_running(ad->current_stream)) {
64 dev_err(dev, "HDMI display disabled, aborting playback\n");
65 snd_pcm_stream_lock_irq(ad->current_stream);
66 snd_pcm_stop(ad->current_stream, SNDRV_PCM_STATE_DISCONNECTED);
67 snd_pcm_stream_unlock_irq(ad->current_stream);
69 mutex_unlock(&ad->current_stream_lock);
72 static int hdmi_dai_startup(struct snd_pcm_substream *substream,
73 struct snd_soc_dai *dai)
75 struct hdmi_audio_data *ad = card_drvdata_substream(substream);
78 * Make sure that the period bytes are multiple of the DMA packet size.
79 * Largest packet size we use is 32 32-bit words = 128 bytes
81 ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
82 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
84 dev_err(dai->dev, "could not apply constraint\n");
88 snd_soc_dai_set_dma_data(dai, substream, &ad->dma_data);
90 mutex_lock(&ad->current_stream_lock);
91 ad->current_stream = substream;
92 mutex_unlock(&ad->current_stream_lock);
94 ret = ad->ops->audio_startup(ad->dssdev, hdmi_dai_abort);
97 mutex_lock(&ad->current_stream_lock);
98 ad->current_stream = NULL;
99 mutex_unlock(&ad->current_stream_lock);
105 static int hdmi_dai_hw_params(struct snd_pcm_substream *substream,
106 struct snd_pcm_hw_params *params,
107 struct snd_soc_dai *dai)
109 struct hdmi_audio_data *ad = card_drvdata_substream(substream);
110 struct snd_aes_iec958 *iec = &ad->iec;
111 struct snd_cea_861_aud_if *cea = &ad->cea;
113 WARN_ON(ad->current_stream != substream);
115 switch (params_format(params)) {
116 case SNDRV_PCM_FORMAT_S16_LE:
117 ad->dma_data.maxburst = 16;
119 case SNDRV_PCM_FORMAT_S24_LE:
120 ad->dma_data.maxburst = 32;
123 dev_err(dai->dev, "format not supported!\n");
127 ad->dss_audio.iec = iec;
128 ad->dss_audio.cea = cea;
130 * fill the IEC-60958 channel status word
132 /* initialize the word bytes */
133 memset(iec->status, 0, sizeof(iec->status));
135 /* specify IEC-60958-3 (commercial use) */
136 iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
138 /* specify that the audio is LPCM*/
139 iec->status[0] &= ~IEC958_AES0_NONAUDIO;
141 iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
143 iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
145 iec->status[0] |= IEC958_AES1_PRO_MODE_NOTID;
147 iec->status[1] = IEC958_AES1_CON_GENERAL;
149 iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
151 iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
153 switch (params_rate(params)) {
155 iec->status[3] |= IEC958_AES3_CON_FS_32000;
158 iec->status[3] |= IEC958_AES3_CON_FS_44100;
161 iec->status[3] |= IEC958_AES3_CON_FS_48000;
164 iec->status[3] |= IEC958_AES3_CON_FS_88200;
167 iec->status[3] |= IEC958_AES3_CON_FS_96000;
170 iec->status[3] |= IEC958_AES3_CON_FS_176400;
173 iec->status[3] |= IEC958_AES3_CON_FS_192000;
176 dev_err(dai->dev, "rate not supported!\n");
180 /* specify the clock accuracy */
181 iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
184 * specify the word length. The same word length value can mean
185 * two different lengths. Hence, we need to specify the maximum
186 * word length as well.
188 switch (params_format(params)) {
189 case SNDRV_PCM_FORMAT_S16_LE:
190 iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
191 iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
193 case SNDRV_PCM_FORMAT_S24_LE:
194 iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
195 iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
198 dev_err(dai->dev, "format not supported!\n");
203 * Fill the CEA-861 audio infoframe (see spec for details)
206 cea->db1_ct_cc = (params_channels(params) - 1)
207 & CEA861_AUDIO_INFOFRAME_DB1CC;
208 cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
210 cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
211 cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
213 cea->db3 = 0; /* not used, all zeros */
216 * The OMAP HDMI IP requires to use the 8-channel channel code when
217 * transmitting more than two channels.
219 if (params_channels(params) == 2)
224 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
225 /* the expression is trivial but makes clear what we are doing */
226 cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
228 return ad->ops->audio_config(ad->dssdev, &ad->dss_audio);
231 static int hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
232 struct snd_soc_dai *dai)
234 struct hdmi_audio_data *ad = card_drvdata_substream(substream);
237 WARN_ON(ad->current_stream != substream);
240 case SNDRV_PCM_TRIGGER_START:
241 case SNDRV_PCM_TRIGGER_RESUME:
242 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
243 err = ad->ops->audio_start(ad->dssdev);
245 case SNDRV_PCM_TRIGGER_STOP:
246 case SNDRV_PCM_TRIGGER_SUSPEND:
247 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
248 ad->ops->audio_stop(ad->dssdev);
256 static void hdmi_dai_shutdown(struct snd_pcm_substream *substream,
257 struct snd_soc_dai *dai)
259 struct hdmi_audio_data *ad = card_drvdata_substream(substream);
261 WARN_ON(ad->current_stream != substream);
263 ad->ops->audio_shutdown(ad->dssdev);
265 mutex_lock(&ad->current_stream_lock);
266 ad->current_stream = NULL;
267 mutex_unlock(&ad->current_stream_lock);
270 static const struct snd_soc_dai_ops hdmi_dai_ops = {
271 .startup = hdmi_dai_startup,
272 .hw_params = hdmi_dai_hw_params,
273 .trigger = hdmi_dai_trigger,
274 .shutdown = hdmi_dai_shutdown,
277 static const struct snd_soc_component_driver omap_hdmi_component = {
278 .name = "omapdss_hdmi",
281 static struct snd_soc_dai_driver omap5_hdmi_dai = {
282 .name = "omap5-hdmi-dai",
286 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
287 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
288 SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
289 SNDRV_PCM_RATE_192000),
290 .formats = SNDRV_PCM_FMTBIT_S16_LE,
292 .ops = &hdmi_dai_ops,
295 static struct snd_soc_dai_driver omap4_hdmi_dai = {
296 .name = "omap4-hdmi-dai",
300 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
301 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
302 SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
303 SNDRV_PCM_RATE_192000),
304 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
306 .ops = &hdmi_dai_ops,
309 static int omap_hdmi_audio_probe(struct platform_device *pdev)
311 struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data;
312 struct device *dev = &pdev->dev;
313 struct hdmi_audio_data *ad;
314 struct snd_soc_dai_driver *dai_drv;
315 struct snd_soc_card *card;
319 dev_err(dev, "No platform data\n");
323 ad = devm_kzalloc(dev, sizeof(*ad), GFP_KERNEL);
326 ad->dssdev = ha->dev;
328 ad->dma_data.addr = ha->audio_dma_addr;
329 ad->dma_data.filter_data = "audio_tx";
330 ad->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
331 mutex_init(&ad->current_stream_lock);
333 switch (ha->dss_version) {
334 case OMAPDSS_VER_OMAP4430_ES1:
335 case OMAPDSS_VER_OMAP4430_ES2:
336 case OMAPDSS_VER_OMAP4:
337 dai_drv = &omap4_hdmi_dai;
339 case OMAPDSS_VER_OMAP5:
340 dai_drv = &omap5_hdmi_dai;
345 ret = snd_soc_register_component(ad->dssdev, &omap_hdmi_component,
350 ret = omap_pcm_platform_register(ad->dssdev);
354 card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
355 card->name = devm_kasprintf(dev, GFP_KERNEL,
356 "HDMI %s", dev_name(ad->dssdev));
357 card->owner = THIS_MODULE;
359 devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL);
360 card->dai_link->name = card->name;
361 card->dai_link->stream_name = card->name;
362 card->dai_link->cpu_dai_name = dev_name(ad->dssdev);
363 card->dai_link->platform_name = dev_name(ad->dssdev);
364 card->dai_link->codec_name = "snd-soc-dummy";
365 card->dai_link->codec_dai_name = "snd-soc-dummy-dai";
369 ret = snd_soc_register_card(card);
371 dev_err(dev, "snd_soc_register_card failed (%d)\n", ret);
372 snd_soc_unregister_component(ad->dssdev);
377 snd_soc_card_set_drvdata(card, ad);
379 dev_set_drvdata(dev, ad);
384 static int omap_hdmi_audio_remove(struct platform_device *pdev)
386 struct hdmi_audio_data *ad = platform_get_drvdata(pdev);
388 snd_soc_unregister_card(ad->card);
389 snd_soc_unregister_component(ad->dssdev);
393 static struct platform_driver hdmi_audio_driver = {
397 .probe = omap_hdmi_audio_probe,
398 .remove = omap_hdmi_audio_remove,
401 module_platform_driver(hdmi_audio_driver);
403 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
404 MODULE_DESCRIPTION("OMAP HDMI Audio Driver");
405 MODULE_LICENSE("GPL");
406 MODULE_ALIAS("platform:" DRV_NAME);