1 // SPDX-License-Identifier: GPL-2.0-only
3 * omap-hdmi-audio.c -- OMAP4+ DSS HDMI audio support library
5 * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
7 * Author: Jyri Sarha <jsarha@ti.com>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/err.h>
13 #include <linux/string.h>
14 #include <linux/platform_device.h>
15 #include <sound/soc.h>
16 #include <sound/pcm_params.h>
17 #include <sound/dmaengine_pcm.h>
18 #include <uapi/sound/asound.h>
19 #include <sound/asoundef.h>
20 #include <sound/omap-hdmi-audio.h>
24 #define DRV_NAME "omap-hdmi-audio"
26 struct hdmi_audio_data {
27 struct snd_soc_card *card;
29 const struct omap_hdmi_audio_ops *ops;
30 struct device *dssdev;
31 struct snd_dmaengine_dai_dma_data dma_data;
32 struct omap_dss_audio dss_audio;
33 struct snd_aes_iec958 iec;
34 struct snd_cea_861_aud_if cea;
36 struct mutex current_stream_lock;
37 struct snd_pcm_substream *current_stream;
41 struct hdmi_audio_data *card_drvdata_substream(struct snd_pcm_substream *ss)
43 struct snd_soc_pcm_runtime *rtd = ss->private_data;
45 return snd_soc_card_get_drvdata(rtd->card);
48 static void hdmi_dai_abort(struct device *dev)
50 struct hdmi_audio_data *ad = dev_get_drvdata(dev);
52 mutex_lock(&ad->current_stream_lock);
53 if (ad->current_stream && ad->current_stream->runtime &&
54 snd_pcm_running(ad->current_stream)) {
55 dev_err(dev, "HDMI display disabled, aborting playback\n");
56 snd_pcm_stream_lock_irq(ad->current_stream);
57 snd_pcm_stop(ad->current_stream, SNDRV_PCM_STATE_DISCONNECTED);
58 snd_pcm_stream_unlock_irq(ad->current_stream);
60 mutex_unlock(&ad->current_stream_lock);
63 static int hdmi_dai_startup(struct snd_pcm_substream *substream,
64 struct snd_soc_dai *dai)
66 struct hdmi_audio_data *ad = card_drvdata_substream(substream);
69 * Make sure that the period bytes are multiple of the DMA packet size.
70 * Largest packet size we use is 32 32-bit words = 128 bytes
72 ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
73 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
75 dev_err(dai->dev, "Could not apply period constraint: %d\n",
79 ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
80 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 128);
82 dev_err(dai->dev, "Could not apply buffer constraint: %d\n",
87 snd_soc_dai_set_dma_data(dai, substream, &ad->dma_data);
89 mutex_lock(&ad->current_stream_lock);
90 ad->current_stream = substream;
91 mutex_unlock(&ad->current_stream_lock);
93 ret = ad->ops->audio_startup(ad->dssdev, hdmi_dai_abort);
96 mutex_lock(&ad->current_stream_lock);
97 ad->current_stream = NULL;
98 mutex_unlock(&ad->current_stream_lock);
104 static int hdmi_dai_hw_params(struct snd_pcm_substream *substream,
105 struct snd_pcm_hw_params *params,
106 struct snd_soc_dai *dai)
108 struct hdmi_audio_data *ad = card_drvdata_substream(substream);
109 struct snd_aes_iec958 *iec = &ad->iec;
110 struct snd_cea_861_aud_if *cea = &ad->cea;
112 WARN_ON(ad->current_stream != substream);
114 switch (params_format(params)) {
115 case SNDRV_PCM_FORMAT_S16_LE:
116 ad->dma_data.maxburst = 16;
118 case SNDRV_PCM_FORMAT_S24_LE:
119 ad->dma_data.maxburst = 32;
122 dev_err(dai->dev, "format not supported!\n");
126 ad->dss_audio.iec = iec;
127 ad->dss_audio.cea = cea;
129 * fill the IEC-60958 channel status word
131 /* initialize the word bytes */
132 memset(iec->status, 0, sizeof(iec->status));
134 /* specify IEC-60958-3 (commercial use) */
135 iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
137 /* specify that the audio is LPCM*/
138 iec->status[0] &= ~IEC958_AES0_NONAUDIO;
140 iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
142 iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
144 iec->status[1] = IEC958_AES1_CON_GENERAL;
146 iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
148 iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
150 switch (params_rate(params)) {
152 iec->status[3] |= IEC958_AES3_CON_FS_32000;
155 iec->status[3] |= IEC958_AES3_CON_FS_44100;
158 iec->status[3] |= IEC958_AES3_CON_FS_48000;
161 iec->status[3] |= IEC958_AES3_CON_FS_88200;
164 iec->status[3] |= IEC958_AES3_CON_FS_96000;
167 iec->status[3] |= IEC958_AES3_CON_FS_176400;
170 iec->status[3] |= IEC958_AES3_CON_FS_192000;
173 dev_err(dai->dev, "rate not supported!\n");
177 /* specify the clock accuracy */
178 iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
181 * specify the word length. The same word length value can mean
182 * two different lengths. Hence, we need to specify the maximum
183 * word length as well.
185 switch (params_format(params)) {
186 case SNDRV_PCM_FORMAT_S16_LE:
187 iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
188 iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
190 case SNDRV_PCM_FORMAT_S24_LE:
191 iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
192 iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
195 dev_err(dai->dev, "format not supported!\n");
200 * Fill the CEA-861 audio infoframe (see spec for details)
203 cea->db1_ct_cc = (params_channels(params) - 1)
204 & CEA861_AUDIO_INFOFRAME_DB1CC;
205 cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
207 cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
208 cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
210 cea->db3 = 0; /* not used, all zeros */
212 if (params_channels(params) == 2)
214 else if (params_channels(params) == 6)
219 if (cea->db4_ca == 0x00)
220 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PERMITTED;
222 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
224 /* the expression is trivial but makes clear what we are doing */
225 cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
227 return ad->ops->audio_config(ad->dssdev, &ad->dss_audio);
230 static int hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
231 struct snd_soc_dai *dai)
233 struct hdmi_audio_data *ad = card_drvdata_substream(substream);
236 WARN_ON(ad->current_stream != substream);
239 case SNDRV_PCM_TRIGGER_START:
240 case SNDRV_PCM_TRIGGER_RESUME:
241 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
242 err = ad->ops->audio_start(ad->dssdev);
244 case SNDRV_PCM_TRIGGER_STOP:
245 case SNDRV_PCM_TRIGGER_SUSPEND:
246 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
247 ad->ops->audio_stop(ad->dssdev);
255 static void hdmi_dai_shutdown(struct snd_pcm_substream *substream,
256 struct snd_soc_dai *dai)
258 struct hdmi_audio_data *ad = card_drvdata_substream(substream);
260 WARN_ON(ad->current_stream != substream);
262 ad->ops->audio_shutdown(ad->dssdev);
264 mutex_lock(&ad->current_stream_lock);
265 ad->current_stream = NULL;
266 mutex_unlock(&ad->current_stream_lock);
269 static const struct snd_soc_dai_ops hdmi_dai_ops = {
270 .startup = hdmi_dai_startup,
271 .hw_params = hdmi_dai_hw_params,
272 .trigger = hdmi_dai_trigger,
273 .shutdown = hdmi_dai_shutdown,
276 static const struct snd_soc_component_driver omap_hdmi_component = {
277 .name = "omapdss_hdmi",
280 static struct snd_soc_dai_driver omap5_hdmi_dai = {
281 .name = "omap5-hdmi-dai",
285 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
286 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
287 SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
288 SNDRV_PCM_RATE_192000),
289 .formats = SNDRV_PCM_FMTBIT_S16_LE,
291 .ops = &hdmi_dai_ops,
294 static struct snd_soc_dai_driver omap4_hdmi_dai = {
295 .name = "omap4-hdmi-dai",
299 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
300 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
301 SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
302 SNDRV_PCM_RATE_192000),
303 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
305 .ops = &hdmi_dai_ops,
308 static int omap_hdmi_audio_probe(struct platform_device *pdev)
310 struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data;
311 struct device *dev = &pdev->dev;
312 struct hdmi_audio_data *ad;
313 struct snd_soc_dai_driver *dai_drv;
314 struct snd_soc_card *card;
315 struct snd_soc_dai_link_component *compnent;
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->version) {
335 dai_drv = &omap4_hdmi_dai;
338 dai_drv = &omap5_hdmi_dai;
343 ret = devm_snd_soc_register_component(ad->dssdev, &omap_hdmi_component,
348 ret = sdma_pcm_platform_register(ad->dssdev, "audio_tx", NULL);
352 card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
356 card->name = devm_kasprintf(dev, GFP_KERNEL,
357 "HDMI %s", dev_name(ad->dssdev));
361 card->owner = THIS_MODULE;
363 devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL);
367 compnent = devm_kzalloc(dev, 3 * sizeof(*compnent), GFP_KERNEL);
370 card->dai_link->cpus = &compnent[0];
371 card->dai_link->num_cpus = 1;
372 card->dai_link->codecs = &compnent[1];
373 card->dai_link->num_codecs = 1;
374 card->dai_link->platforms = &compnent[2];
375 card->dai_link->num_platforms = 1;
377 card->dai_link->name = card->name;
378 card->dai_link->stream_name = card->name;
379 card->dai_link->cpus->dai_name = dev_name(ad->dssdev);
380 card->dai_link->platforms->name = dev_name(ad->dssdev);
381 card->dai_link->codecs->name = "snd-soc-dummy";
382 card->dai_link->codecs->dai_name = "snd-soc-dummy-dai";
386 ret = snd_soc_register_card(card);
388 dev_err(dev, "snd_soc_register_card failed (%d)\n", ret);
393 snd_soc_card_set_drvdata(card, ad);
395 dev_set_drvdata(dev, ad);
400 static int omap_hdmi_audio_remove(struct platform_device *pdev)
402 struct hdmi_audio_data *ad = platform_get_drvdata(pdev);
404 snd_soc_unregister_card(ad->card);
408 static struct platform_driver hdmi_audio_driver = {
412 .probe = omap_hdmi_audio_probe,
413 .remove = omap_hdmi_audio_remove,
416 module_platform_driver(hdmi_audio_driver);
418 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
419 MODULE_DESCRIPTION("OMAP HDMI Audio Driver");
420 MODULE_LICENSE("GPL");
421 MODULE_ALIAS("platform:" DRV_NAME);