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
card_drvdata_substream(struct snd_pcm_substream * ss)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
hdmi_dai_abort(struct device * dev)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
hdmi_dai_startup(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)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
hdmi_dai_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)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
hdmi_dai_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)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
hdmi_dai_shutdown(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)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
omap_hdmi_audio_probe(struct platform_device * pdev)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->version) {
341 case 4:
342 dai_drv = &omap4_hdmi_dai;
343 break;
344 case 5:
345 dai_drv = &omap5_hdmi_dai;
346 break;
347 default:
348 return -EINVAL;
349 }
350 ret = snd_soc_register_component(ad->dssdev, &omap_hdmi_component,
351 dai_drv, 1);
352 if (ret)
353 return ret;
354
355 ret = omap_pcm_platform_register(ad->dssdev);
356 if (ret)
357 return ret;
358
359 card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
360 if (!card)
361 return -ENOMEM;
362
363 card->name = devm_kasprintf(dev, GFP_KERNEL,
364 "HDMI %s", dev_name(ad->dssdev));
365 card->owner = THIS_MODULE;
366 card->dai_link =
367 devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL);
368 if (!card->dai_link)
369 return -ENOMEM;
370 card->dai_link->name = card->name;
371 card->dai_link->stream_name = card->name;
372 card->dai_link->cpu_dai_name = dev_name(ad->dssdev);
373 card->dai_link->platform_name = dev_name(ad->dssdev);
374 card->dai_link->codec_name = "snd-soc-dummy";
375 card->dai_link->codec_dai_name = "snd-soc-dummy-dai";
376 card->num_links = 1;
377 card->dev = dev;
378
379 ret = snd_soc_register_card(card);
380 if (ret) {
381 dev_err(dev, "snd_soc_register_card failed (%d)\n", ret);
382 snd_soc_unregister_component(ad->dssdev);
383 return ret;
384 }
385
386 ad->card = card;
387 snd_soc_card_set_drvdata(card, ad);
388
389 dev_set_drvdata(dev, ad);
390
391 return 0;
392 }
393
omap_hdmi_audio_remove(struct platform_device * pdev)394 static int omap_hdmi_audio_remove(struct platform_device *pdev)
395 {
396 struct hdmi_audio_data *ad = platform_get_drvdata(pdev);
397
398 snd_soc_unregister_card(ad->card);
399 snd_soc_unregister_component(ad->dssdev);
400 return 0;
401 }
402
403 static struct platform_driver hdmi_audio_driver = {
404 .driver = {
405 .name = DRV_NAME,
406 },
407 .probe = omap_hdmi_audio_probe,
408 .remove = omap_hdmi_audio_remove,
409 };
410
411 module_platform_driver(hdmi_audio_driver);
412
413 MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
414 MODULE_DESCRIPTION("OMAP HDMI Audio Driver");
415 MODULE_LICENSE("GPL");
416 MODULE_ALIAS("platform:" DRV_NAME);
417