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Linux/sound/soc/omap/omap-hdmi.c

  1 /*
  2  * omap-hdmi.c
  3  *
  4  * OMAP ALSA SoC DAI driver for HDMI audio on OMAP4 processors.
  5  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com/
  6  * Authors: Jorge Candelaria <jorge.candelaria@ti.com>
  7  *          Ricardo Neri <ricardo.neri@ti.com>
  8  *
  9  * This program is free software; you can redistribute it and/or
 10  * modify it under the terms of the GNU General Public License
 11  * version 2 as published by the Free Software Foundation.
 12  *
 13  * This program is distributed in the hope that it will be useful, but
 14  * WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 16  * General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 21  * 02110-1301 USA
 22  *
 23  */
 24 
 25 #include <linux/init.h>
 26 #include <linux/module.h>
 27 #include <linux/device.h>
 28 #include <sound/core.h>
 29 #include <sound/pcm.h>
 30 #include <sound/pcm_params.h>
 31 #include <sound/initval.h>
 32 #include <sound/soc.h>
 33 #include <sound/asound.h>
 34 #include <sound/asoundef.h>
 35 #include <sound/dmaengine_pcm.h>
 36 #include <video/omapdss.h>
 37 #include <sound/omap-pcm.h>
 38 
 39 #include "omap-hdmi.h"
 40 
 41 #define DRV_NAME "omap-hdmi-audio-dai"
 42 
 43 struct hdmi_priv {
 44         struct snd_dmaengine_dai_dma_data dma_data;
 45         unsigned int dma_req;
 46         struct omap_dss_audio dss_audio;
 47         struct snd_aes_iec958 iec;
 48         struct snd_cea_861_aud_if cea;
 49         struct omap_dss_device *dssdev;
 50 };
 51 
 52 static int omap_hdmi_dai_startup(struct snd_pcm_substream *substream,
 53                                   struct snd_soc_dai *dai)
 54 {
 55         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
 56         int err;
 57         /*
 58          * Make sure that the period bytes are multiple of the DMA packet size.
 59          * Largest packet size we use is 32 32-bit words = 128 bytes
 60          */
 61         err = snd_pcm_hw_constraint_step(substream->runtime, 0,
 62                                  SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
 63         if (err < 0) {
 64                 dev_err(dai->dev, "could not apply constraint\n");
 65                 return err;
 66         }
 67 
 68         if (!priv->dssdev->driver->audio_supported(priv->dssdev)) {
 69                 dev_err(dai->dev, "audio not supported\n");
 70                 return -ENODEV;
 71         }
 72 
 73         snd_soc_dai_set_dma_data(dai, substream, &priv->dma_data);
 74 
 75         return 0;
 76 }
 77 
 78 static int omap_hdmi_dai_prepare(struct snd_pcm_substream *substream,
 79                                 struct snd_soc_dai *dai)
 80 {
 81         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
 82 
 83         return priv->dssdev->driver->audio_enable(priv->dssdev);
 84 }
 85 
 86 static int omap_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
 87                                     struct snd_pcm_hw_params *params,
 88                                     struct snd_soc_dai *dai)
 89 {
 90         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
 91         struct snd_aes_iec958 *iec = &priv->iec;
 92         struct snd_cea_861_aud_if *cea = &priv->cea;
 93         int err = 0;
 94 
 95         switch (params_format(params)) {
 96         case SNDRV_PCM_FORMAT_S16_LE:
 97                 priv->dma_data.maxburst = 16;
 98                 break;
 99         case SNDRV_PCM_FORMAT_S24_LE:
100                 priv->dma_data.maxburst = 32;
101                 break;
102         default:
103                 dev_err(dai->dev, "format not supported!\n");
104                 return -EINVAL;
105         }
106 
107         /*
108          * fill the IEC-60958 channel status word
109          */
110         /* initialize the word bytes */
111         memset(iec->status, 0, sizeof(iec->status));
112 
113         /* specify IEC-60958-3 (commercial use) */
114         iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
115 
116         /* specify that the audio is LPCM*/
117         iec->status[0] &= ~IEC958_AES0_NONAUDIO;
118 
119         iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
120 
121         iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
122 
123         iec->status[0] |= IEC958_AES1_PRO_MODE_NOTID;
124 
125         iec->status[1] = IEC958_AES1_CON_GENERAL;
126 
127         iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
128 
129         iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
130 
131         switch (params_rate(params)) {
132         case 32000:
133                 iec->status[3] |= IEC958_AES3_CON_FS_32000;
134                 break;
135         case 44100:
136                 iec->status[3] |= IEC958_AES3_CON_FS_44100;
137                 break;
138         case 48000:
139                 iec->status[3] |= IEC958_AES3_CON_FS_48000;
140                 break;
141         case 88200:
142                 iec->status[3] |= IEC958_AES3_CON_FS_88200;
143                 break;
144         case 96000:
145                 iec->status[3] |= IEC958_AES3_CON_FS_96000;
146                 break;
147         case 176400:
148                 iec->status[3] |= IEC958_AES3_CON_FS_176400;
149                 break;
150         case 192000:
151                 iec->status[3] |= IEC958_AES3_CON_FS_192000;
152                 break;
153         default:
154                 dev_err(dai->dev, "rate not supported!\n");
155                 return -EINVAL;
156         }
157 
158         /* specify the clock accuracy */
159         iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
160 
161         /*
162          * specify the word length. The same word length value can mean
163          * two different lengths. Hence, we need to specify the maximum
164          * word length as well.
165          */
166         switch (params_format(params)) {
167         case SNDRV_PCM_FORMAT_S16_LE:
168                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
169                 iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
170                 break;
171         case SNDRV_PCM_FORMAT_S24_LE:
172                 iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
173                 iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
174                 break;
175         default:
176                 dev_err(dai->dev, "format not supported!\n");
177                 return -EINVAL;
178         }
179 
180         /*
181          * Fill the CEA-861 audio infoframe (see spec for details)
182          */
183 
184         cea->db1_ct_cc = (params_channels(params) - 1)
185                 & CEA861_AUDIO_INFOFRAME_DB1CC;
186         cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
187 
188         cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
189         cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
190 
191         cea->db3 = 0; /* not used, all zeros */
192 
193         /*
194          * The OMAP HDMI IP requires to use the 8-channel channel code when
195          * transmitting more than two channels.
196          */
197         if (params_channels(params) == 2)
198                 cea->db4_ca = 0x0;
199         else
200                 cea->db4_ca = 0x13;
201 
202         cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
203         /* the expression is trivial but makes clear what we are doing */
204         cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
205 
206         priv->dss_audio.iec = iec;
207         priv->dss_audio.cea = cea;
208 
209         err = priv->dssdev->driver->audio_config(priv->dssdev,
210                                                  &priv->dss_audio);
211 
212         return err;
213 }
214 
215 static int omap_hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
216                                 struct snd_soc_dai *dai)
217 {
218         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
219         int err = 0;
220 
221         switch (cmd) {
222         case SNDRV_PCM_TRIGGER_START:
223         case SNDRV_PCM_TRIGGER_RESUME:
224         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
225                 err = priv->dssdev->driver->audio_start(priv->dssdev);
226                 break;
227         case SNDRV_PCM_TRIGGER_STOP:
228         case SNDRV_PCM_TRIGGER_SUSPEND:
229         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
230                 priv->dssdev->driver->audio_stop(priv->dssdev);
231                 break;
232         default:
233                 err = -EINVAL;
234         }
235         return err;
236 }
237 
238 static void omap_hdmi_dai_shutdown(struct snd_pcm_substream *substream,
239                                 struct snd_soc_dai *dai)
240 {
241         struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
242 
243         priv->dssdev->driver->audio_disable(priv->dssdev);
244 }
245 
246 static const struct snd_soc_dai_ops omap_hdmi_dai_ops = {
247         .startup        = omap_hdmi_dai_startup,
248         .hw_params      = omap_hdmi_dai_hw_params,
249         .prepare        = omap_hdmi_dai_prepare,
250         .trigger        = omap_hdmi_dai_trigger,
251         .shutdown       = omap_hdmi_dai_shutdown,
252 };
253 
254 static struct snd_soc_dai_driver omap_hdmi_dai = {
255         .playback = {
256                 .channels_min = 2,
257                 .channels_max = 8,
258                 .rates = OMAP_HDMI_RATES,
259                 .formats = OMAP_HDMI_FORMATS,
260         },
261         .ops = &omap_hdmi_dai_ops,
262 };
263 
264 static const struct snd_soc_component_driver omap_hdmi_component = {
265         .name           = DRV_NAME,
266 };
267 
268 static int omap_hdmi_probe(struct platform_device *pdev)
269 {
270         int ret;
271         struct resource *hdmi_rsrc;
272         struct hdmi_priv *hdmi_data;
273         bool hdmi_dev_found = false;
274 
275         hdmi_data = devm_kzalloc(&pdev->dev, sizeof(*hdmi_data), GFP_KERNEL);
276         if (hdmi_data == NULL) {
277                 dev_err(&pdev->dev, "Cannot allocate memory for HDMI data\n");
278                 return -ENOMEM;
279         }
280 
281         hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
282         if (!hdmi_rsrc) {
283                 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_MEM HDMI\n");
284                 return -ENODEV;
285         }
286 
287         hdmi_data->dma_data.addr = hdmi_rsrc->start + OMAP_HDMI_AUDIO_DMA_PORT;
288 
289         hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_DMA, 0);
290         if (!hdmi_rsrc) {
291                 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_DMA HDMI\n");
292                 return -ENODEV;
293         }
294 
295         hdmi_data->dma_req = hdmi_rsrc->start;
296         hdmi_data->dma_data.filter_data = &hdmi_data->dma_req;
297         hdmi_data->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
298 
299         /*
300          * TODO: We assume that there is only one DSS HDMI device. Future
301          * OMAP implementations may support more than one HDMI devices and
302          * we should provided separate audio support for all of them.
303          */
304         /* Find an HDMI device. */
305         for_each_dss_dev(hdmi_data->dssdev) {
306                 omap_dss_get_device(hdmi_data->dssdev);
307 
308                 if (!hdmi_data->dssdev->driver) {
309                         omap_dss_put_device(hdmi_data->dssdev);
310                         continue;
311                 }
312 
313                 if (hdmi_data->dssdev->type == OMAP_DISPLAY_TYPE_HDMI) {
314                         hdmi_dev_found = true;
315                         break;
316                 }
317         }
318 
319         if (!hdmi_dev_found) {
320                 dev_err(&pdev->dev, "no driver for HDMI display found\n");
321                 return -ENODEV;
322         }
323 
324         dev_set_drvdata(&pdev->dev, hdmi_data);
325         ret = snd_soc_register_component(&pdev->dev, &omap_hdmi_component,
326                                          &omap_hdmi_dai, 1);
327 
328         if (ret)
329                 return ret;
330 
331         return omap_pcm_platform_register(&pdev->dev);
332 }
333 
334 static int omap_hdmi_remove(struct platform_device *pdev)
335 {
336         struct hdmi_priv *hdmi_data = dev_get_drvdata(&pdev->dev);
337 
338         snd_soc_unregister_component(&pdev->dev);
339 
340         if (hdmi_data == NULL) {
341                 dev_err(&pdev->dev, "cannot obtain HDMi data\n");
342                 return -ENODEV;
343         }
344 
345         omap_dss_put_device(hdmi_data->dssdev);
346         return 0;
347 }
348 
349 static struct platform_driver hdmi_dai_driver = {
350         .driver = {
351                 .name = DRV_NAME,
352                 .owner = THIS_MODULE,
353         },
354         .probe = omap_hdmi_probe,
355         .remove = omap_hdmi_remove,
356 };
357 
358 module_platform_driver(hdmi_dai_driver);
359 
360 MODULE_AUTHOR("Jorge Candelaria <jorge.candelaria@ti.com>");
361 MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
362 MODULE_DESCRIPTION("OMAP HDMI SoC Interface");
363 MODULE_LICENSE("GPL");
364 MODULE_ALIAS("platform:" DRV_NAME);
365 

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