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
35struct 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
49static
50struct 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
57static 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
72static 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
105static 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[1] = IEC958_AES1_CON_GENERAL;
146
147	iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
148
149	iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
150
151	switch (params_rate(params)) {
152	case 32000:
153		iec->status[3] |= IEC958_AES3_CON_FS_32000;
154		break;
155	case 44100:
156		iec->status[3] |= IEC958_AES3_CON_FS_44100;
157		break;
158	case 48000:
159		iec->status[3] |= IEC958_AES3_CON_FS_48000;
160		break;
161	case 88200:
162		iec->status[3] |= IEC958_AES3_CON_FS_88200;
163		break;
164	case 96000:
165		iec->status[3] |= IEC958_AES3_CON_FS_96000;
166		break;
167	case 176400:
168		iec->status[3] |= IEC958_AES3_CON_FS_176400;
169		break;
170	case 192000:
171		iec->status[3] |= IEC958_AES3_CON_FS_192000;
172		break;
173	default:
174		dev_err(dai->dev, "rate not supported!\n");
175		return -EINVAL;
176	}
177
178	/* specify the clock accuracy */
179	iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
180
181	/*
182	 * specify the word length. The same word length value can mean
183	 * two different lengths. Hence, we need to specify the maximum
184	 * word length as well.
185	 */
186	switch (params_format(params)) {
187	case SNDRV_PCM_FORMAT_S16_LE:
188		iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
189		iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
190		break;
191	case SNDRV_PCM_FORMAT_S24_LE:
192		iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
193		iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
194		break;
195	default:
196		dev_err(dai->dev, "format not supported!\n");
197		return -EINVAL;
198	}
199
200	/*
201	 * Fill the CEA-861 audio infoframe (see spec for details)
202	 */
203
204	cea->db1_ct_cc = (params_channels(params) - 1)
205		& CEA861_AUDIO_INFOFRAME_DB1CC;
206	cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
207
208	cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
209	cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
210
211	cea->db3 = 0; /* not used, all zeros */
212
213	/*
214	 * The OMAP HDMI IP requires to use the 8-channel channel code when
215	 * transmitting more than two channels.
216	 */
217	if (params_channels(params) == 2)
218		cea->db4_ca = 0x0;
219	else
220		cea->db4_ca = 0x13;
221
222	cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
223	/* the expression is trivial but makes clear what we are doing */
224	cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
225
226	return ad->ops->audio_config(ad->dssdev, &ad->dss_audio);
227}
228
229static int hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
230			    struct snd_soc_dai *dai)
231{
232	struct hdmi_audio_data *ad = card_drvdata_substream(substream);
233	int err = 0;
234
235	WARN_ON(ad->current_stream != substream);
236
237	switch (cmd) {
238	case SNDRV_PCM_TRIGGER_START:
239	case SNDRV_PCM_TRIGGER_RESUME:
240	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
241		err = ad->ops->audio_start(ad->dssdev);
242		break;
243	case SNDRV_PCM_TRIGGER_STOP:
244	case SNDRV_PCM_TRIGGER_SUSPEND:
245	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
246		ad->ops->audio_stop(ad->dssdev);
247		break;
248	default:
249		err = -EINVAL;
250	}
251	return err;
252}
253
254static void hdmi_dai_shutdown(struct snd_pcm_substream *substream,
255			      struct snd_soc_dai *dai)
256{
257	struct hdmi_audio_data *ad = card_drvdata_substream(substream);
258
259	WARN_ON(ad->current_stream != substream);
260
261	ad->ops->audio_shutdown(ad->dssdev);
262
263	mutex_lock(&ad->current_stream_lock);
264	ad->current_stream = NULL;
265	mutex_unlock(&ad->current_stream_lock);
266}
267
268static const struct snd_soc_dai_ops hdmi_dai_ops = {
269	.startup	= hdmi_dai_startup,
270	.hw_params	= hdmi_dai_hw_params,
271	.trigger	= hdmi_dai_trigger,
272	.shutdown	= hdmi_dai_shutdown,
273};
274
275static const struct snd_soc_component_driver omap_hdmi_component = {
276	.name = "omapdss_hdmi",
277};
278
279static struct snd_soc_dai_driver omap5_hdmi_dai = {
280	.name = "omap5-hdmi-dai",
281	.playback = {
282		.channels_min = 2,
283		.channels_max = 8,
284		.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
285			  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
286			  SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
287			  SNDRV_PCM_RATE_192000),
288		.formats = SNDRV_PCM_FMTBIT_S16_LE,
289	},
290	.ops = &hdmi_dai_ops,
291};
292
293static struct snd_soc_dai_driver omap4_hdmi_dai = {
294	.name = "omap4-hdmi-dai",
295	.playback = {
296		.channels_min = 2,
297		.channels_max = 8,
298		.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
299			  SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
300			  SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
301			  SNDRV_PCM_RATE_192000),
302		.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
303	},
304	.ops = &hdmi_dai_ops,
305};
306
307static int omap_hdmi_audio_probe(struct platform_device *pdev)
308{
309	struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data;
310	struct device *dev = &pdev->dev;
311	struct hdmi_audio_data *ad;
312	struct snd_soc_dai_driver *dai_drv;
313	struct snd_soc_card *card;
314	int ret;
315
316	if (!ha) {
317		dev_err(dev, "No platform data\n");
318		return -EINVAL;
319	}
320
321	ad = devm_kzalloc(dev, sizeof(*ad), GFP_KERNEL);
322	if (!ad)
323		return -ENOMEM;
324	ad->dssdev = ha->dev;
325	ad->ops = ha->ops;
326	ad->dma_data.addr = ha->audio_dma_addr;
327	ad->dma_data.filter_data = "audio_tx";
328	ad->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
329	mutex_init(&ad->current_stream_lock);
330
331	switch (ha->dss_version) {
332	case OMAPDSS_VER_OMAP4430_ES1:
333	case OMAPDSS_VER_OMAP4430_ES2:
334	case OMAPDSS_VER_OMAP4:
335		dai_drv = &omap4_hdmi_dai;
336		break;
337	case OMAPDSS_VER_OMAP5:
338		dai_drv = &omap5_hdmi_dai;
339		break;
340	default:
341		return -EINVAL;
342	}
343	ret = snd_soc_register_component(ad->dssdev, &omap_hdmi_component,
344					 dai_drv, 1);
345	if (ret)
346		return ret;
347
348	ret = omap_pcm_platform_register(ad->dssdev);
349	if (ret)
350		return ret;
351
352	card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
353	if (!card)
354		return -ENOMEM;
355
356	card->name = devm_kasprintf(dev, GFP_KERNEL,
357				    "HDMI %s", dev_name(ad->dssdev));
358	card->owner = THIS_MODULE;
359	card->dai_link =
360		devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL);
361	card->dai_link->name = card->name;
362	card->dai_link->stream_name = card->name;
363	card->dai_link->cpu_dai_name = dev_name(ad->dssdev);
364	card->dai_link->platform_name = dev_name(ad->dssdev);
365	card->dai_link->codec_name = "snd-soc-dummy";
366	card->dai_link->codec_dai_name = "snd-soc-dummy-dai";
367	card->num_links = 1;
368	card->dev = dev;
369
370	ret = snd_soc_register_card(card);
371	if (ret) {
372		dev_err(dev, "snd_soc_register_card failed (%d)\n", ret);
373		snd_soc_unregister_component(ad->dssdev);
374		return ret;
375	}
376
377	ad->card = card;
378	snd_soc_card_set_drvdata(card, ad);
379
380	dev_set_drvdata(dev, ad);
381
382	return 0;
383}
384
385static int omap_hdmi_audio_remove(struct platform_device *pdev)
386{
387	struct hdmi_audio_data *ad = platform_get_drvdata(pdev);
388
389	snd_soc_unregister_card(ad->card);
390	snd_soc_unregister_component(ad->dssdev);
391	return 0;
392}
393
394static struct platform_driver hdmi_audio_driver = {
395	.driver = {
396		.name = DRV_NAME,
397	},
398	.probe = omap_hdmi_audio_probe,
399	.remove = omap_hdmi_audio_remove,
400};
401
402module_platform_driver(hdmi_audio_driver);
403
404MODULE_AUTHOR("Jyri Sarha <jsarha@ti.com>");
405MODULE_DESCRIPTION("OMAP HDMI Audio Driver");
406MODULE_LICENSE("GPL");
407MODULE_ALIAS("platform:" DRV_NAME);
408