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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 
 32 #define DRV_NAME "omap-hdmi-audio"
 33 
 34 struct hdmi_audio_data {
 35         struct snd_soc_card *card;
 36 
 37         const struct omap_hdmi_audio_ops *ops;
 38         struct device *dssdev;
 39         struct snd_dmaengine_dai_dma_data dma_data;
 40         struct omap_dss_audio dss_audio;
 41         struct snd_aes_iec958 iec;
 42         struct snd_cea_861_aud_if cea;
 43 
 44         struct mutex current_stream_lock;
 45         struct snd_pcm_substream *current_stream;
 46 };
 47 
 48 static
 49 struct hdmi_audio_data *card_drvdata_substream(struct snd_pcm_substream *ss)
 50 {
 51         struct snd_soc_pcm_runtime *rtd = ss->private_data;
 52 
 53         return snd_soc_card_get_drvdata(rtd->card);
 54 }
 55 
 56 static void hdmi_dai_abort(struct device *dev)
 57 {
 58         struct hdmi_audio_data *ad = dev_get_drvdata(dev);
 59 
 60         mutex_lock(&ad->current_stream_lock);
 61         if (ad->current_stream && ad->current_stream->runtime &&
 62             snd_pcm_running(ad->current_stream)) {
 63                 dev_err(dev, "HDMI display disabled, aborting playback\n");
 64                 snd_pcm_stream_lock_irq(ad->current_stream);
 65                 snd_pcm_stop(ad->current_stream, SNDRV_PCM_STATE_DISCONNECTED);
 66                 snd_pcm_stream_unlock_irq(ad->current_stream);
 67         }
 68         mutex_unlock(&ad->current_stream_lock);
 69 }
 70 
 71 static int hdmi_dai_startup(struct snd_pcm_substream *substream,
 72                             struct snd_soc_dai *dai)
 73 {
 74         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
 75         int ret;
 76         /*
 77          * Make sure that the period bytes are multiple of the DMA packet size.
 78          * Largest packet size we use is 32 32-bit words = 128 bytes
 79          */
 80         ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
 81                                          SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
 82         if (ret < 0) {
 83                 dev_err(dai->dev, "Could not apply period constraint: %d\n",
 84                         ret);
 85                 return ret;
 86         }
 87         ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
 88                                          SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 128);
 89         if (ret < 0) {
 90                 dev_err(dai->dev, "Could not apply buffer constraint: %d\n",
 91                         ret);
 92                 return ret;
 93         }
 94 
 95         snd_soc_dai_set_dma_data(dai, substream, &ad->dma_data);
 96 
 97         mutex_lock(&ad->current_stream_lock);
 98         ad->current_stream = substream;
 99         mutex_unlock(&ad->current_stream_lock);
100 
101         ret = ad->ops->audio_startup(ad->dssdev, hdmi_dai_abort);
102 
103         if (ret) {
104                 mutex_lock(&ad->current_stream_lock);
105                 ad->current_stream = NULL;
106                 mutex_unlock(&ad->current_stream_lock);
107         }
108 
109         return ret;
110 }
111 
112 static int hdmi_dai_hw_params(struct snd_pcm_substream *substream,
113                               struct snd_pcm_hw_params *params,
114                               struct snd_soc_dai *dai)
115 {
116         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
117         struct snd_aes_iec958 *iec = &ad->iec;
118         struct snd_cea_861_aud_if *cea = &ad->cea;
119 
120         WARN_ON(ad->current_stream != substream);
121 
122         switch (params_format(params)) {
123         case SNDRV_PCM_FORMAT_S16_LE:
124                 ad->dma_data.maxburst = 16;
125                 break;
126         case SNDRV_PCM_FORMAT_S24_LE:
127                 ad->dma_data.maxburst = 32;
128                 break;
129         default:
130                 dev_err(dai->dev, "format not supported!\n");
131                 return -EINVAL;
132         }
133 
134         ad->dss_audio.iec = iec;
135         ad->dss_audio.cea = cea;
136         /*
137          * fill the IEC-60958 channel status word
138          */
139         /* initialize the word bytes */
140         memset(iec->status, 0, sizeof(iec->status));
141 
142         /* specify IEC-60958-3 (commercial use) */
143         iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
144 
145         /* specify that the audio is LPCM*/
146         iec->status[0] &= ~IEC958_AES0_NONAUDIO;
147 
148         iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
149 
150         iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
151 
152         iec->status[1] = IEC958_AES1_CON_GENERAL;
153 
154         iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
155 
156         iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
157 
158         switch (params_rate(params)) {
159         case 32000:
160                 iec->status[3] |= IEC958_AES3_CON_FS_32000;
161                 break;
162         case 44100:
163                 iec->status[3] |= IEC958_AES3_CON_FS_44100;
164                 break;
165         case 48000:
166                 iec->status[3] |= IEC958_AES3_CON_FS_48000;
167                 break;
168         case 88200:
169                 iec->status[3] |= IEC958_AES3_CON_FS_88200;
170                 break;
171         case 96000:
172                 iec->status[3] |= IEC958_AES3_CON_FS_96000;
173                 break;
174         case 176400:
175                 iec->status[3] |= IEC958_AES3_CON_FS_176400;
176                 break;
177         case 192000:
178                 iec->status[3] |= IEC958_AES3_CON_FS_192000;
179                 break;
180         default:
181                 dev_err(dai->dev, "rate not supported!\n");
182                 return -EINVAL;
183         }
184 
185         /* specify the clock accuracy */
186         iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
187 
188         /*
189          * specify the word length. The same word length value can mean
190          * two different lengths. Hence, we need to specify the maximum
191          * word length as well.
192          */
193         switch (params_format(params)) {
194         case SNDRV_PCM_FORMAT_S16_LE:
195                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
196                 iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
197                 break;
198         case SNDRV_PCM_FORMAT_S24_LE:
199                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
200                 iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
201                 break;
202         default:
203                 dev_err(dai->dev, "format not supported!\n");
204                 return -EINVAL;
205         }
206 
207         /*
208          * Fill the CEA-861 audio infoframe (see spec for details)
209          */
210 
211         cea->db1_ct_cc = (params_channels(params) - 1)
212                 & CEA861_AUDIO_INFOFRAME_DB1CC;
213         cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
214 
215         cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
216         cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
217 
218         cea->db3 = 0; /* not used, all zeros */
219 
220         if (params_channels(params) == 2)
221                 cea->db4_ca = 0x0;
222         else if (params_channels(params) == 6)
223                 cea->db4_ca = 0xb;
224         else
225                 cea->db4_ca = 0x13;
226 
227         if (cea->db4_ca == 0x00)
228                 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PERMITTED;
229         else
230                 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
231 
232         /* the expression is trivial but makes clear what we are doing */
233         cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
234 
235         return ad->ops->audio_config(ad->dssdev, &ad->dss_audio);
236 }
237 
238 static int hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
239                             struct snd_soc_dai *dai)
240 {
241         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
242         int err = 0;
243 
244         WARN_ON(ad->current_stream != substream);
245 
246         switch (cmd) {
247         case SNDRV_PCM_TRIGGER_START:
248         case SNDRV_PCM_TRIGGER_RESUME:
249         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
250                 err = ad->ops->audio_start(ad->dssdev);
251                 break;
252         case SNDRV_PCM_TRIGGER_STOP:
253         case SNDRV_PCM_TRIGGER_SUSPEND:
254         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
255                 ad->ops->audio_stop(ad->dssdev);
256                 break;
257         default:
258                 err = -EINVAL;
259         }
260         return err;
261 }
262 
263 static void hdmi_dai_shutdown(struct snd_pcm_substream *substream,
264                               struct snd_soc_dai *dai)
265 {
266         struct hdmi_audio_data *ad = card_drvdata_substream(substream);
267 
268         WARN_ON(ad->current_stream != substream);
269 
270         ad->ops->audio_shutdown(ad->dssdev);
271 
272         mutex_lock(&ad->current_stream_lock);
273         ad->current_stream = NULL;
274         mutex_unlock(&ad->current_stream_lock);
275 }
276 
277 static const struct snd_soc_dai_ops hdmi_dai_ops = {
278         .startup        = hdmi_dai_startup,
279         .hw_params      = hdmi_dai_hw_params,
280         .trigger        = hdmi_dai_trigger,
281         .shutdown       = hdmi_dai_shutdown,
282 };
283 
284 static const struct snd_soc_component_driver omap_hdmi_component = {
285         .name = "omapdss_hdmi",
286 };
287 
288 static struct snd_soc_dai_driver omap5_hdmi_dai = {
289         .name = "omap5-hdmi-dai",
290         .playback = {
291                 .channels_min = 2,
292                 .channels_max = 8,
293                 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
294                           SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
295                           SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
296                           SNDRV_PCM_RATE_192000),
297                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
298         },
299         .ops = &hdmi_dai_ops,
300 };
301 
302 static struct snd_soc_dai_driver omap4_hdmi_dai = {
303         .name = "omap4-hdmi-dai",
304         .playback = {
305                 .channels_min = 2,
306                 .channels_max = 8,
307                 .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
308                           SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
309                           SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
310                           SNDRV_PCM_RATE_192000),
311                 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
312         },
313         .ops = &hdmi_dai_ops,
314 };
315 
316 static int omap_hdmi_audio_probe(struct platform_device *pdev)
317 {
318         struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data;
319         struct device *dev = &pdev->dev;
320         struct hdmi_audio_data *ad;
321         struct snd_soc_dai_driver *dai_drv;
322         struct snd_soc_card *card;
323         int ret;
324 
325         if (!ha) {
326                 dev_err(dev, "No platform data\n");
327                 return -EINVAL;
328         }
329 
330         ad = devm_kzalloc(dev, sizeof(*ad), GFP_KERNEL);
331         if (!ad)
332                 return -ENOMEM;
333         ad->dssdev = ha->dev;
334         ad->ops = ha->ops;
335         ad->dma_data.addr = ha->audio_dma_addr;
336         ad->dma_data.filter_data = "audio_tx";
337         ad->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
338         mutex_init(&ad->current_stream_lock);
339 
340         switch (ha->dss_version) {
341         case OMAPDSS_VER_OMAP4430_ES1:
342         case OMAPDSS_VER_OMAP4430_ES2:
343         case OMAPDSS_VER_OMAP4:
344                 dai_drv = &omap4_hdmi_dai;
345                 break;
346         case OMAPDSS_VER_OMAP5:
347         case OMAPDSS_VER_DRA7xx:
348                 dai_drv = &omap5_hdmi_dai;
349                 break;
350         default:
351                 return -EINVAL;
352         }
353         ret = snd_soc_register_component(ad->dssdev, &omap_hdmi_component,
354                                          dai_drv, 1);
355         if (ret)
356                 return ret;
357 
358         ret = omap_pcm_platform_register(ad->dssdev);
359         if (ret)
360                 return ret;
361 
362         card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
363         if (!card)
364                 return -ENOMEM;
365 
366         card->name = devm_kasprintf(dev, GFP_KERNEL,
367                                     "HDMI %s", dev_name(ad->dssdev));
368         card->owner = THIS_MODULE;
369         card->dai_link =
370                 devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL);
371         if (!card->dai_link)
372                 return -ENOMEM;
373         card->dai_link->name = card->name;
374         card->dai_link->stream_name = card->name;
375         card->dai_link->cpu_dai_name = dev_name(ad->dssdev);
376         card->dai_link->platform_name = dev_name(ad->dssdev);
377         card->dai_link->codec_name = "snd-soc-dummy";
378         card->dai_link->codec_dai_name = "snd-soc-dummy-dai";
379         card->num_links = 1;
380         card->dev = dev;
381 
382         ret = snd_soc_register_card(card);
383         if (ret) {
384                 dev_err(dev, "snd_soc_register_card failed (%d)\n", ret);
385                 snd_soc_unregister_component(ad->dssdev);
386                 return ret;
387         }
388 
389         ad->card = card;
390         snd_soc_card_set_drvdata(card, ad);
391 
392         dev_set_drvdata(dev, ad);
393 
394         return 0;
395 }
396 
397 static int omap_hdmi_audio_remove(struct platform_device *pdev)
398 {
399         struct hdmi_audio_data *ad = platform_get_drvdata(pdev);
400 
401         snd_soc_unregister_card(ad->card);
402         snd_soc_unregister_component(ad->dssdev);
403         return 0;
404 }
405 
406 static struct platform_driver hdmi_audio_driver = {
407         .driver = {
408                 .name = DRV_NAME,
409         },
410         .probe = omap_hdmi_audio_probe,
411         .remove = omap_hdmi_audio_remove,
412 };
413 
414 module_platform_driver(hdmi_audio_driver);
415 
416 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
417 MODULE_DESCRIPTION("OMAP HDMI Audio Driver");
418 MODULE_LICENSE("GPL");
419 MODULE_ALIAS("platform:" DRV_NAME);
420 

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