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TOMOYO Linux Cross Reference
Linux/sound/soc/omap/omap-hdmi-audio.c

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  1 /*
  2  * omap-hdmi-audio.c -- OMAP4+ DSS HDMI audio support library
  3  *
  4  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
  5  *
  6  * Author: Jyri Sarha <jsarha@ti.com>
  7  *
  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.
 11  *
 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.
 16  *
 17  */
 18 
 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>
 32 
 33 #define DRV_NAME "omap-hdmi-audio"
 34 
 35 struct hdmi_audio_data {
 36         struct snd_soc_card *card;
 37 
 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;
 44 
 45         struct mutex current_stream_lock;
 46         struct snd_pcm_substream *current_stream;
 47 };
 48 
 49 static
 50 struct hdmi_audio_data *card_drvdata_substream(struct snd_pcm_substream *ss)
 51 {
 52         struct snd_soc_pcm_runtime *rtd = ss->private_data;
 53 
 54         return snd_soc_card_get_drvdata(rtd->card);
 55 }
 56 
 57 static void hdmi_dai_abort(struct device *dev)
 58 {
 59         struct hdmi_audio_data *ad = dev_get_drvdata(dev);
 60 
 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);
 68         }
 69         mutex_unlock(&ad->current_stream_lock);
 70 }
 71 
 72 static int hdmi_dai_startup(struct snd_pcm_substream *substream,
 73                             struct snd_soc_dai *dai)
 74 {
 75         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
 76         int ret;
 77         /*
 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
 80          */
 81         ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
 82                                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
 83         if (ret < 0) {
 84                 dev_err(dai->dev, "Could not apply period constraint: %d\n",
 85                         ret);
 86                 return ret;
 87         }
 88         ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
 89                                          SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 128);
 90         if (ret < 0) {
 91                 dev_err(dai->dev, "Could not apply buffer constraint: %d\n",
 92                         ret);
 93                 return ret;
 94         }
 95 
 96         snd_soc_dai_set_dma_data(dai, substream, &ad->dma_data);
 97 
 98         mutex_lock(&ad->current_stream_lock);
 99         ad->current_stream = substream;
100         mutex_unlock(&ad->current_stream_lock);
101 
102         ret = ad->ops->audio_startup(ad->dssdev, hdmi_dai_abort);
103 
104         if (ret) {
105                 mutex_lock(&ad->current_stream_lock);
106                 ad->current_stream = NULL;
107                 mutex_unlock(&ad->current_stream_lock);
108         }
109 
110         return ret;
111 }
112 
113 static int hdmi_dai_hw_params(struct snd_pcm_substream *substream,
114                               struct snd_pcm_hw_params *params,
115                               struct snd_soc_dai *dai)
116 {
117         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
118         struct snd_aes_iec958 *iec = &ad->iec;
119         struct snd_cea_861_aud_if *cea = &ad->cea;
120 
121         WARN_ON(ad->current_stream != substream);
122 
123         switch (params_format(params)) {
124         case SNDRV_PCM_FORMAT_S16_LE:
125                 ad->dma_data.maxburst = 16;
126                 break;
127         case SNDRV_PCM_FORMAT_S24_LE:
128                 ad->dma_data.maxburst = 32;
129                 break;
130         default:
131                 dev_err(dai->dev, "format not supported!\n");
132                 return -EINVAL;
133         }
134 
135         ad->dss_audio.iec = iec;
136         ad->dss_audio.cea = cea;
137         /*
138          * fill the IEC-60958 channel status word
139          */
140         /* initialize the word bytes */
141         memset(iec->status, 0, sizeof(iec->status));
142 
143         /* specify IEC-60958-3 (commercial use) */
144         iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
145 
146         /* specify that the audio is LPCM*/
147         iec->status[0] &= ~IEC958_AES0_NONAUDIO;
148 
149         iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
150 
151         iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
152 
153         iec->status[1] = IEC958_AES1_CON_GENERAL;
154 
155         iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
156 
157         iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
158 
159         switch (params_rate(params)) {
160         case 32000:
161                 iec->status[3] |= IEC958_AES3_CON_FS_32000;
162                 break;
163         case 44100:
164                 iec->status[3] |= IEC958_AES3_CON_FS_44100;
165                 break;
166         case 48000:
167                 iec->status[3] |= IEC958_AES3_CON_FS_48000;
168                 break;
169         case 88200:
170                 iec->status[3] |= IEC958_AES3_CON_FS_88200;
171                 break;
172         case 96000:
173                 iec->status[3] |= IEC958_AES3_CON_FS_96000;
174                 break;
175         case 176400:
176                 iec->status[3] |= IEC958_AES3_CON_FS_176400;
177                 break;
178         case 192000:
179                 iec->status[3] |= IEC958_AES3_CON_FS_192000;
180                 break;
181         default:
182                 dev_err(dai->dev, "rate not supported!\n");
183                 return -EINVAL;
184         }
185 
186         /* specify the clock accuracy */
187         iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
188 
189         /*
190          * specify the word length. The same word length value can mean
191          * two different lengths. Hence, we need to specify the maximum
192          * word length as well.
193          */
194         switch (params_format(params)) {
195         case SNDRV_PCM_FORMAT_S16_LE:
196                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
197                 iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
198                 break;
199         case SNDRV_PCM_FORMAT_S24_LE:
200                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
201                 iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
202                 break;
203         default:
204                 dev_err(dai->dev, "format not supported!\n");
205                 return -EINVAL;
206         }
207 
208         /*
209          * Fill the CEA-861 audio infoframe (see spec for details)
210          */
211 
212         cea->db1_ct_cc = (params_channels(params) - 1)
213                 & CEA861_AUDIO_INFOFRAME_DB1CC;
214         cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
215 
216         cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
217         cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
218 
219         cea->db3 = 0; /* not used, all zeros */
220 
221         if (params_channels(params) == 2)
222                 cea->db4_ca = 0x0;
223         else if (params_channels(params) == 6)
224                 cea->db4_ca = 0xb;
225         else
226                 cea->db4_ca = 0x13;
227 
228         if (cea->db4_ca == 0x00)
229                 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PERMITTED;
230         else
231                 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
232 
233         /* the expression is trivial but makes clear what we are doing */
234         cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
235 
236         return ad->ops->audio_config(ad->dssdev, &ad->dss_audio);
237 }
238 
239 static int hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
240                             struct snd_soc_dai *dai)
241 {
242         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
243         int err = 0;
244 
245         WARN_ON(ad->current_stream != substream);
246 
247         switch (cmd) {
248         case SNDRV_PCM_TRIGGER_START:
249         case SNDRV_PCM_TRIGGER_RESUME:
250         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
251                 err = ad->ops->audio_start(ad->dssdev);
252                 break;
253         case SNDRV_PCM_TRIGGER_STOP:
254         case SNDRV_PCM_TRIGGER_SUSPEND:
255         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
256                 ad->ops->audio_stop(ad->dssdev);
257                 break;
258         default:
259                 err = -EINVAL;
260         }
261         return err;
262 }
263 
264 static void hdmi_dai_shutdown(struct snd_pcm_substream *substream,
265                               struct snd_soc_dai *dai)
266 {
267         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
268 
269         WARN_ON(ad->current_stream != substream);
270 
271         ad->ops->audio_shutdown(ad->dssdev);
272 
273         mutex_lock(&ad->current_stream_lock);
274         ad->current_stream = NULL;
275         mutex_unlock(&ad->current_stream_lock);
276 }
277 
278 static const struct snd_soc_dai_ops hdmi_dai_ops = {
279         .startup        = hdmi_dai_startup,
280         .hw_params      = hdmi_dai_hw_params,
281         .trigger        = hdmi_dai_trigger,
282         .shutdown       = hdmi_dai_shutdown,
283 };
284 
285 static const struct snd_soc_component_driver omap_hdmi_component = {
286         .name = "omapdss_hdmi",
287 };
288 
289 static struct snd_soc_dai_driver omap5_hdmi_dai = {
290         .name = "omap5-hdmi-dai",
291         .playback = {
292                 .channels_min = 2,
293                 .channels_max = 8,
294                 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
295                           SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
296                           SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
297                           SNDRV_PCM_RATE_192000),
298                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
299         },
300         .ops = &hdmi_dai_ops,
301 };
302 
303 static struct snd_soc_dai_driver omap4_hdmi_dai = {
304         .name = "omap4-hdmi-dai",
305         .playback = {
306                 .channels_min = 2,
307                 .channels_max = 8,
308                 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
309                           SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
310                           SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
311                           SNDRV_PCM_RATE_192000),
312                 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
313         },
314         .ops = &hdmi_dai_ops,
315 };
316 
317 static int omap_hdmi_audio_probe(struct platform_device *pdev)
318 {
319         struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data;
320         struct device *dev = &pdev->dev;
321         struct hdmi_audio_data *ad;
322         struct snd_soc_dai_driver *dai_drv;
323         struct snd_soc_card *card;
324         int ret;
325 
326         if (!ha) {
327                 dev_err(dev, "No platform data\n");
328                 return -EINVAL;
329         }
330 
331         ad = devm_kzalloc(dev, sizeof(*ad), GFP_KERNEL);
332         if (!ad)
333                 return -ENOMEM;
334         ad->dssdev = ha->dev;
335         ad->ops = ha->ops;
336         ad->dma_data.addr = ha->audio_dma_addr;
337         ad->dma_data.filter_data = "audio_tx";
338         ad->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
339         mutex_init(&ad->current_stream_lock);
340 
341         switch (ha->dss_version) {
342         case OMAPDSS_VER_OMAP4430_ES1:
343         case OMAPDSS_VER_OMAP4430_ES2:
344         case OMAPDSS_VER_OMAP4:
345                 dai_drv = &omap4_hdmi_dai;
346                 break;
347         case OMAPDSS_VER_OMAP5:
348         case OMAPDSS_VER_DRA7xx:
349                 dai_drv = &omap5_hdmi_dai;
350                 break;
351         default:
352                 return -EINVAL;
353         }
354         ret = snd_soc_register_component(ad->dssdev, &omap_hdmi_component,
355                                          dai_drv, 1);
356         if (ret)
357                 return ret;
358 
359         ret = omap_pcm_platform_register(ad->dssdev);
360         if (ret)
361                 return ret;
362 
363         card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
364         if (!card)
365                 return -ENOMEM;
366 
367         card->name = devm_kasprintf(dev, GFP_KERNEL,
368                                     "HDMI %s", dev_name(ad->dssdev));
369         card->owner = THIS_MODULE;
370         card->dai_link =
371                 devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL);
372         if (!card->dai_link)
373                 return -ENOMEM;
374         card->dai_link->name = card->name;
375         card->dai_link->stream_name = card->name;
376         card->dai_link->cpu_dai_name = dev_name(ad->dssdev);
377         card->dai_link->platform_name = dev_name(ad->dssdev);
378         card->dai_link->codec_name = "snd-soc-dummy";
379         card->dai_link->codec_dai_name = "snd-soc-dummy-dai";
380         card->num_links = 1;
381         card->dev = dev;
382 
383         ret = snd_soc_register_card(card);
384         if (ret) {
385                 dev_err(dev, "snd_soc_register_card failed (%d)\n", ret);
386                 snd_soc_unregister_component(ad->dssdev);
387                 return ret;
388         }
389 
390         ad->card = card;
391         snd_soc_card_set_drvdata(card, ad);
392 
393         dev_set_drvdata(dev, ad);
394 
395         return 0;
396 }
397 
398 static int omap_hdmi_audio_remove(struct platform_device *pdev)
399 {
400         struct hdmi_audio_data *ad = platform_get_drvdata(pdev);
401 
402         snd_soc_unregister_card(ad->card);
403         snd_soc_unregister_component(ad->dssdev);
404         return 0;
405 }
406 
407 static struct platform_driver hdmi_audio_driver = {
408         .driver = {
409                 .name = DRV_NAME,
410         },
411         .probe = omap_hdmi_audio_probe,
412         .remove = omap_hdmi_audio_remove,
413 };
414 
415 module_platform_driver(hdmi_audio_driver);
416 
417 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
418 MODULE_DESCRIPTION("OMAP HDMI Audio Driver");
419 MODULE_LICENSE("GPL");
420 MODULE_ALIAS("platform:" DRV_NAME);
421 

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