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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 constraint\n"); | |
85 | return ret; | |
86 | } | |
87 | ||
88 | snd_soc_dai_set_dma_data(dai, substream, &ad->dma_data); | |
89 | ||
90 | mutex_lock(&ad->current_stream_lock); | |
91 | ad->current_stream = substream; | |
92 | mutex_unlock(&ad->current_stream_lock); | |
93 | ||
94 | ret = ad->ops->audio_startup(ad->dssdev, hdmi_dai_abort); | |
95 | ||
96 | if (ret) { | |
97 | mutex_lock(&ad->current_stream_lock); | |
98 | ad->current_stream = NULL; | |
99 | mutex_unlock(&ad->current_stream_lock); | |
100 | } | |
101 | ||
102 | return ret; | |
103 | } | |
104 | ||
105 | static int hdmi_dai_hw_params(struct snd_pcm_substream *substream, | |
106 | struct snd_pcm_hw_params *params, | |
107 | struct snd_soc_dai *dai) | |
108 | { | |
109 | struct hdmi_audio_data *ad = card_drvdata_substream(substream); | |
110 | struct snd_aes_iec958 *iec = &ad->iec; | |
111 | struct snd_cea_861_aud_if *cea = &ad->cea; | |
112 | ||
113 | WARN_ON(ad->current_stream != substream); | |
114 | ||
115 | switch (params_format(params)) { | |
116 | case SNDRV_PCM_FORMAT_S16_LE: | |
117 | ad->dma_data.maxburst = 16; | |
118 | break; | |
119 | case SNDRV_PCM_FORMAT_S24_LE: | |
120 | ad->dma_data.maxburst = 32; | |
121 | break; | |
122 | default: | |
123 | dev_err(dai->dev, "format not supported!\n"); | |
124 | return -EINVAL; | |
125 | } | |
126 | ||
127 | ad->dss_audio.iec = iec; | |
128 | ad->dss_audio.cea = cea; | |
129 | /* | |
130 | * fill the IEC-60958 channel status word | |
131 | */ | |
132 | /* initialize the word bytes */ | |
133 | memset(iec->status, 0, sizeof(iec->status)); | |
134 | ||
135 | /* specify IEC-60958-3 (commercial use) */ | |
136 | iec->status[0] &= ~IEC958_AES0_PROFESSIONAL; | |
137 | ||
138 | /* specify that the audio is LPCM*/ | |
139 | iec->status[0] &= ~IEC958_AES0_NONAUDIO; | |
140 | ||
141 | iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT; | |
142 | ||
143 | iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE; | |
144 | ||
145 | iec->status[0] |= IEC958_AES1_PRO_MODE_NOTID; | |
146 | ||
147 | iec->status[1] = IEC958_AES1_CON_GENERAL; | |
148 | ||
149 | iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC; | |
150 | ||
151 | iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC; | |
152 | ||
153 | switch (params_rate(params)) { | |
154 | case 32000: | |
155 | iec->status[3] |= IEC958_AES3_CON_FS_32000; | |
156 | break; | |
157 | case 44100: | |
158 | iec->status[3] |= IEC958_AES3_CON_FS_44100; | |
159 | break; | |
160 | case 48000: | |
161 | iec->status[3] |= IEC958_AES3_CON_FS_48000; | |
162 | break; | |
163 | case 88200: | |
164 | iec->status[3] |= IEC958_AES3_CON_FS_88200; | |
165 | break; | |
166 | case 96000: | |
167 | iec->status[3] |= IEC958_AES3_CON_FS_96000; | |
168 | break; | |
169 | case 176400: | |
170 | iec->status[3] |= IEC958_AES3_CON_FS_176400; | |
171 | break; | |
172 | case 192000: | |
173 | iec->status[3] |= IEC958_AES3_CON_FS_192000; | |
174 | break; | |
175 | default: | |
176 | dev_err(dai->dev, "rate not supported!\n"); | |
177 | return -EINVAL; | |
178 | } | |
179 | ||
180 | /* specify the clock accuracy */ | |
181 | iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM; | |
182 | ||
183 | /* | |
184 | * specify the word length. The same word length value can mean | |
185 | * two different lengths. Hence, we need to specify the maximum | |
186 | * word length as well. | |
187 | */ | |
188 | switch (params_format(params)) { | |
189 | case SNDRV_PCM_FORMAT_S16_LE: | |
190 | iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16; | |
191 | iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24; | |
192 | break; | |
193 | case SNDRV_PCM_FORMAT_S24_LE: | |
194 | iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20; | |
195 | iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24; | |
196 | break; | |
197 | default: | |
198 | dev_err(dai->dev, "format not supported!\n"); | |
199 | return -EINVAL; | |
200 | } | |
201 | ||
202 | /* | |
203 | * Fill the CEA-861 audio infoframe (see spec for details) | |
204 | */ | |
205 | ||
206 | cea->db1_ct_cc = (params_channels(params) - 1) | |
207 | & CEA861_AUDIO_INFOFRAME_DB1CC; | |
208 | cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM; | |
209 | ||
210 | cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM; | |
211 | cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM; | |
212 | ||
213 | cea->db3 = 0; /* not used, all zeros */ | |
214 | ||
215 | /* | |
216 | * The OMAP HDMI IP requires to use the 8-channel channel code when | |
217 | * transmitting more than two channels. | |
218 | */ | |
219 | if (params_channels(params) == 2) | |
220 | cea->db4_ca = 0x0; | |
221 | else | |
222 | cea->db4_ca = 0x13; | |
223 | ||
224 | cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED; | |
225 | /* the expression is trivial but makes clear what we are doing */ | |
226 | cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV); | |
227 | ||
228 | return ad->ops->audio_config(ad->dssdev, &ad->dss_audio); | |
229 | } | |
230 | ||
231 | static int hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd, | |
232 | struct snd_soc_dai *dai) | |
233 | { | |
234 | struct hdmi_audio_data *ad = card_drvdata_substream(substream); | |
235 | int err = 0; | |
236 | ||
237 | WARN_ON(ad->current_stream != substream); | |
238 | ||
239 | switch (cmd) { | |
240 | case SNDRV_PCM_TRIGGER_START: | |
241 | case SNDRV_PCM_TRIGGER_RESUME: | |
242 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: | |
243 | err = ad->ops->audio_start(ad->dssdev); | |
244 | break; | |
245 | case SNDRV_PCM_TRIGGER_STOP: | |
246 | case SNDRV_PCM_TRIGGER_SUSPEND: | |
247 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: | |
248 | ad->ops->audio_stop(ad->dssdev); | |
249 | break; | |
250 | default: | |
251 | err = -EINVAL; | |
252 | } | |
253 | return err; | |
254 | } | |
255 | ||
256 | static void hdmi_dai_shutdown(struct snd_pcm_substream *substream, | |
257 | struct snd_soc_dai *dai) | |
258 | { | |
259 | struct hdmi_audio_data *ad = card_drvdata_substream(substream); | |
260 | ||
261 | WARN_ON(ad->current_stream != substream); | |
262 | ||
263 | ad->ops->audio_shutdown(ad->dssdev); | |
264 | ||
265 | mutex_lock(&ad->current_stream_lock); | |
266 | ad->current_stream = NULL; | |
267 | mutex_unlock(&ad->current_stream_lock); | |
268 | } | |
269 | ||
270 | static const struct snd_soc_dai_ops hdmi_dai_ops = { | |
271 | .startup = hdmi_dai_startup, | |
272 | .hw_params = hdmi_dai_hw_params, | |
273 | .trigger = hdmi_dai_trigger, | |
274 | .shutdown = hdmi_dai_shutdown, | |
275 | }; | |
276 | ||
277 | static const struct snd_soc_component_driver omap_hdmi_component = { | |
278 | .name = "omapdss_hdmi", | |
279 | }; | |
280 | ||
281 | static struct snd_soc_dai_driver omap5_hdmi_dai = { | |
282 | .name = "omap5-hdmi-dai", | |
283 | .playback = { | |
284 | .channels_min = 2, | |
285 | .channels_max = 8, | |
286 | .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | | |
287 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | | |
288 | SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 | | |
289 | SNDRV_PCM_RATE_192000), | |
290 | .formats = SNDRV_PCM_FMTBIT_S16_LE, | |
291 | }, | |
292 | .ops = &hdmi_dai_ops, | |
293 | }; | |
294 | ||
295 | static struct snd_soc_dai_driver omap4_hdmi_dai = { | |
296 | .name = "omap4-hdmi-dai", | |
297 | .playback = { | |
298 | .channels_min = 2, | |
299 | .channels_max = 8, | |
300 | .rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | | |
301 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | | |
302 | SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 | | |
303 | SNDRV_PCM_RATE_192000), | |
304 | .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE, | |
305 | }, | |
306 | .ops = &hdmi_dai_ops, | |
307 | }; | |
308 | ||
309 | static int omap_hdmi_audio_probe(struct platform_device *pdev) | |
310 | { | |
311 | struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data; | |
312 | struct device *dev = &pdev->dev; | |
313 | struct hdmi_audio_data *ad; | |
314 | struct snd_soc_dai_driver *dai_drv; | |
315 | struct snd_soc_card *card; | |
316 | int ret; | |
317 | ||
318 | if (!ha) { | |
319 | dev_err(dev, "No platform data\n"); | |
320 | return -EINVAL; | |
321 | } | |
322 | ||
323 | ad = devm_kzalloc(dev, sizeof(*ad), GFP_KERNEL); | |
324 | if (!ad) | |
325 | return -ENOMEM; | |
326 | ad->dssdev = ha->dev; | |
327 | ad->ops = ha->ops; | |
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); | |
332 | ||
333 | switch (ha->dss_version) { | |
334 | case OMAPDSS_VER_OMAP4430_ES1: | |
335 | case OMAPDSS_VER_OMAP4430_ES2: | |
336 | case OMAPDSS_VER_OMAP4: | |
337 | dai_drv = &omap4_hdmi_dai; | |
338 | break; | |
339 | case OMAPDSS_VER_OMAP5: | |
340 | dai_drv = &omap5_hdmi_dai; | |
341 | break; | |
342 | default: | |
343 | return -EINVAL; | |
344 | } | |
345 | ret = snd_soc_register_component(ad->dssdev, &omap_hdmi_component, | |
346 | dai_drv, 1); | |
347 | if (ret) | |
348 | return ret; | |
349 | ||
350 | ret = omap_pcm_platform_register(ad->dssdev); | |
351 | if (ret) | |
352 | return ret; | |
353 | ||
354 | card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL); | |
355 | card->name = devm_kasprintf(dev, GFP_KERNEL, | |
356 | "HDMI %s", dev_name(ad->dssdev)); | |
357 | card->owner = THIS_MODULE; | |
358 | card->dai_link = | |
359 | devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL); | |
360 | card->dai_link->name = card->name; | |
361 | card->dai_link->stream_name = card->name; | |
362 | card->dai_link->cpu_dai_name = dev_name(ad->dssdev); | |
363 | card->dai_link->platform_name = dev_name(ad->dssdev); | |
364 | card->dai_link->codec_name = "snd-soc-dummy"; | |
365 | card->dai_link->codec_dai_name = "snd-soc-dummy-dai"; | |
366 | card->num_links = 1; | |
367 | card->dev = dev; | |
368 | ||
369 | ret = snd_soc_register_card(card); | |
370 | if (ret) { | |
371 | dev_err(dev, "snd_soc_register_card failed (%d)\n", ret); | |
372 | snd_soc_unregister_component(ad->dssdev); | |
373 | return ret; | |
374 | } | |
375 | ||
376 | ad->card = card; | |
377 | snd_soc_card_set_drvdata(card, ad); | |
378 | ||
379 | dev_set_drvdata(dev, ad); | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | static int omap_hdmi_audio_remove(struct platform_device *pdev) | |
385 | { | |
386 | struct hdmi_audio_data *ad = platform_get_drvdata(pdev); | |
387 | ||
388 | snd_soc_unregister_card(ad->card); | |
389 | snd_soc_unregister_component(ad->dssdev); | |
390 | return 0; | |
391 | } | |
392 | ||
393 | static struct platform_driver hdmi_audio_driver = { | |
394 | .driver = { | |
395 | .name = DRV_NAME, | |
396 | .owner = THIS_MODULE, | |
397 | }, | |
398 | .probe = omap_hdmi_audio_probe, | |
399 | .remove = omap_hdmi_audio_remove, | |
400 | }; | |
401 | ||
402 | module_platform_driver(hdmi_audio_driver); | |
403 | ||
404 | MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>"); | |
405 | MODULE_DESCRIPTION("OMAP HDMI Audio Driver"); | |
406 | MODULE_LICENSE("GPL"); | |
407 | MODULE_ALIAS("platform:" DRV_NAME); |