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