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>
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.
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.
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
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>
39 #include "omap-hdmi.h"
41 #define DRV_NAME "omap-hdmi-audio-dai"
44 struct snd_dmaengine_dai_dma_data dma_data;
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;
52 static int omap_hdmi_dai_startup(struct snd_pcm_substream *substream,
53 struct snd_soc_dai *dai)
55 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
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
61 err = snd_pcm_hw_constraint_step(substream->runtime, 0,
62 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
64 dev_err(dai->dev, "could not apply constraint\n");
68 if (!priv->dssdev->driver->audio_supported(priv->dssdev)) {
69 dev_err(dai->dev, "audio not supported\n");
73 snd_soc_dai_set_dma_data(dai, substream, &priv->dma_data);
78 static int omap_hdmi_dai_prepare(struct snd_pcm_substream *substream,
79 struct snd_soc_dai *dai)
81 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
83 return priv->dssdev->driver->audio_enable(priv->dssdev);
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)
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;
95 switch (params_format(params)) {
96 case SNDRV_PCM_FORMAT_S16_LE:
97 priv->dma_data.maxburst = 16;
99 case SNDRV_PCM_FORMAT_S24_LE:
100 priv->dma_data.maxburst = 32;
103 dev_err(dai->dev, "format not supported!\n");
108 * fill the IEC-60958 channel status word
110 /* initialize the word bytes */
111 memset(iec->status, 0, sizeof(iec->status));
113 /* specify IEC-60958-3 (commercial use) */
114 iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
116 /* specify that the audio is LPCM*/
117 iec->status[0] &= ~IEC958_AES0_NONAUDIO;
119 iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
121 iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
123 iec->status[0] |= IEC958_AES1_PRO_MODE_NOTID;
125 iec->status[1] = IEC958_AES1_CON_GENERAL;
127 iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
129 iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
131 switch (params_rate(params)) {
133 iec->status[3] |= IEC958_AES3_CON_FS_32000;
136 iec->status[3] |= IEC958_AES3_CON_FS_44100;
139 iec->status[3] |= IEC958_AES3_CON_FS_48000;
142 iec->status[3] |= IEC958_AES3_CON_FS_88200;
145 iec->status[3] |= IEC958_AES3_CON_FS_96000;
148 iec->status[3] |= IEC958_AES3_CON_FS_176400;
151 iec->status[3] |= IEC958_AES3_CON_FS_192000;
154 dev_err(dai->dev, "rate not supported!\n");
158 /* specify the clock accuracy */
159 iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
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.
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;
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;
176 dev_err(dai->dev, "format not supported!\n");
181 * Fill the CEA-861 audio infoframe (see spec for details)
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;
188 cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
189 cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
191 cea->db3 = 0; /* not used, all zeros */
194 * The OMAP HDMI IP requires to use the 8-channel channel code when
195 * transmitting more than two channels.
197 if (params_channels(params) == 2)
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);
206 priv->dss_audio.iec = iec;
207 priv->dss_audio.cea = cea;
209 err = priv->dssdev->driver->audio_config(priv->dssdev,
215 static int omap_hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
216 struct snd_soc_dai *dai)
218 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
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);
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);
238 static void omap_hdmi_dai_shutdown(struct snd_pcm_substream *substream,
239 struct snd_soc_dai *dai)
241 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
243 priv->dssdev->driver->audio_disable(priv->dssdev);
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,
254 static struct snd_soc_dai_driver omap_hdmi_dai = {
258 .rates = OMAP_HDMI_RATES,
259 .formats = OMAP_HDMI_FORMATS,
261 .ops = &omap_hdmi_dai_ops,
264 static const struct snd_soc_component_driver omap_hdmi_component = {
268 static int omap_hdmi_probe(struct platform_device *pdev)
271 struct resource *hdmi_rsrc;
272 struct hdmi_priv *hdmi_data;
273 bool hdmi_dev_found = false;
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");
281 hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
283 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_MEM HDMI\n");
287 hdmi_data->dma_data.addr = hdmi_rsrc->start + OMAP_HDMI_AUDIO_DMA_PORT;
289 hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_DMA, 0);
291 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_DMA HDMI\n");
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;
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.
304 /* Find an HDMI device. */
305 for_each_dss_dev(hdmi_data->dssdev) {
306 omap_dss_get_device(hdmi_data->dssdev);
308 if (!hdmi_data->dssdev->driver) {
309 omap_dss_put_device(hdmi_data->dssdev);
313 if (hdmi_data->dssdev->type == OMAP_DISPLAY_TYPE_HDMI) {
314 hdmi_dev_found = true;
319 if (!hdmi_dev_found) {
320 dev_err(&pdev->dev, "no driver for HDMI display found\n");
324 dev_set_drvdata(&pdev->dev, hdmi_data);
325 ret = snd_soc_register_component(&pdev->dev, &omap_hdmi_component,
331 return omap_pcm_platform_register(&pdev->dev);
334 static int omap_hdmi_remove(struct platform_device *pdev)
336 struct hdmi_priv *hdmi_data = dev_get_drvdata(&pdev->dev);
338 snd_soc_unregister_component(&pdev->dev);
340 if (hdmi_data == NULL) {
341 dev_err(&pdev->dev, "cannot obtain HDMi data\n");
345 omap_dss_put_device(hdmi_data->dssdev);
349 static struct platform_driver hdmi_dai_driver = {
352 .owner = THIS_MODULE,
354 .probe = omap_hdmi_probe,
355 .remove = omap_hdmi_remove,
358 module_platform_driver(hdmi_dai_driver);
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);