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 <video/omapdss.h>
38 #include "omap-hdmi.h"
40 #define DRV_NAME "omap-hdmi-audio-dai"
43 struct omap_pcm_dma_data dma_params;
44 struct omap_dss_audio dss_audio;
45 struct snd_aes_iec958 iec;
46 struct snd_cea_861_aud_if cea;
47 struct omap_dss_device *dssdev;
50 static int omap_hdmi_dai_startup(struct snd_pcm_substream *substream,
51 struct snd_soc_dai *dai)
53 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
56 * Make sure that the period bytes are multiple of the DMA packet size.
57 * Largest packet size we use is 32 32-bit words = 128 bytes
59 err = snd_pcm_hw_constraint_step(substream->runtime, 0,
60 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
62 dev_err(dai->dev, "could not apply constraint\n");
66 if (!priv->dssdev->driver->audio_supported(priv->dssdev)) {
67 dev_err(dai->dev, "audio not supported\n");
71 snd_soc_dai_set_dma_data(dai, substream, &priv->dma_params);
76 static int omap_hdmi_dai_prepare(struct snd_pcm_substream *substream,
77 struct snd_soc_dai *dai)
79 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
81 return priv->dssdev->driver->audio_enable(priv->dssdev);
84 static int omap_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
85 struct snd_pcm_hw_params *params,
86 struct snd_soc_dai *dai)
88 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
89 struct snd_aes_iec958 *iec = &priv->iec;
90 struct snd_cea_861_aud_if *cea = &priv->cea;
91 struct omap_pcm_dma_data *dma_data;
94 dma_data = snd_soc_dai_get_dma_data(dai, substream);
96 switch (params_format(params)) {
97 case SNDRV_PCM_FORMAT_S16_LE:
98 dma_data->packet_size = 16;
100 case SNDRV_PCM_FORMAT_S24_LE:
101 dma_data->packet_size = 32;
104 dev_err(dai->dev, "format not supported!\n");
108 dma_data->data_type = 32;
111 * fill the IEC-60958 channel status word
113 /* initialize the word bytes */
114 memset(iec->status, 0, sizeof(iec->status));
116 /* specify IEC-60958-3 (commercial use) */
117 iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
119 /* specify that the audio is LPCM*/
120 iec->status[0] &= ~IEC958_AES0_NONAUDIO;
122 iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
124 iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
126 iec->status[0] |= IEC958_AES1_PRO_MODE_NOTID;
128 iec->status[1] = IEC958_AES1_CON_GENERAL;
130 iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
132 iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
134 switch (params_rate(params)) {
136 iec->status[3] |= IEC958_AES3_CON_FS_32000;
139 iec->status[3] |= IEC958_AES3_CON_FS_44100;
142 iec->status[3] |= IEC958_AES3_CON_FS_48000;
145 iec->status[3] |= IEC958_AES3_CON_FS_88200;
148 iec->status[3] |= IEC958_AES3_CON_FS_96000;
151 iec->status[3] |= IEC958_AES3_CON_FS_176400;
154 iec->status[3] |= IEC958_AES3_CON_FS_192000;
157 dev_err(dai->dev, "rate not supported!\n");
161 /* specify the clock accuracy */
162 iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
165 * specify the word length. The same word length value can mean
166 * two different lengths. Hence, we need to specify the maximum
167 * word length as well.
169 switch (params_format(params)) {
170 case SNDRV_PCM_FORMAT_S16_LE:
171 iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
172 iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
174 case SNDRV_PCM_FORMAT_S24_LE:
175 iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
176 iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
179 dev_err(dai->dev, "format not supported!\n");
184 * Fill the CEA-861 audio infoframe (see spec for details)
187 cea->db1_ct_cc = (params_channels(params) - 1)
188 & CEA861_AUDIO_INFOFRAME_DB1CC;
189 cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
191 cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
192 cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
194 cea->db3 = 0; /* not used, all zeros */
197 * The OMAP HDMI IP requires to use the 8-channel channel code when
198 * transmitting more than two channels.
200 if (params_channels(params) == 2)
205 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
206 /* the expression is trivial but makes clear what we are doing */
207 cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
209 priv->dss_audio.iec = iec;
210 priv->dss_audio.cea = cea;
212 err = priv->dssdev->driver->audio_config(priv->dssdev,
218 static int omap_hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
219 struct snd_soc_dai *dai)
221 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
225 case SNDRV_PCM_TRIGGER_START:
226 case SNDRV_PCM_TRIGGER_RESUME:
227 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
228 err = priv->dssdev->driver->audio_start(priv->dssdev);
230 case SNDRV_PCM_TRIGGER_STOP:
231 case SNDRV_PCM_TRIGGER_SUSPEND:
232 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
233 priv->dssdev->driver->audio_stop(priv->dssdev);
241 static void omap_hdmi_dai_shutdown(struct snd_pcm_substream *substream,
242 struct snd_soc_dai *dai)
244 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
246 priv->dssdev->driver->audio_disable(priv->dssdev);
249 static const struct snd_soc_dai_ops omap_hdmi_dai_ops = {
250 .startup = omap_hdmi_dai_startup,
251 .hw_params = omap_hdmi_dai_hw_params,
252 .prepare = omap_hdmi_dai_prepare,
253 .trigger = omap_hdmi_dai_trigger,
254 .shutdown = omap_hdmi_dai_shutdown,
257 static struct snd_soc_dai_driver omap_hdmi_dai = {
261 .rates = OMAP_HDMI_RATES,
262 .formats = OMAP_HDMI_FORMATS,
264 .ops = &omap_hdmi_dai_ops,
267 static int omap_hdmi_probe(struct platform_device *pdev)
270 struct resource *hdmi_rsrc;
271 struct hdmi_priv *hdmi_data;
272 bool hdmi_dev_found = false;
274 hdmi_data = devm_kzalloc(&pdev->dev, sizeof(*hdmi_data), GFP_KERNEL);
275 if (hdmi_data == NULL) {
276 dev_err(&pdev->dev, "Cannot allocate memory for HDMI data\n");
280 hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
282 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_MEM HDMI\n");
286 hdmi_data->dma_params.port_addr = hdmi_rsrc->start
287 + 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_params.dma_req = hdmi_rsrc->start;
296 hdmi_data->dma_params.name = "HDMI playback";
299 * TODO: We assume that there is only one DSS HDMI device. Future
300 * OMAP implementations may support more than one HDMI devices and
301 * we should provided separate audio support for all of them.
303 /* Find an HDMI device. */
304 for_each_dss_dev(hdmi_data->dssdev) {
305 omap_dss_get_device(hdmi_data->dssdev);
307 if (!hdmi_data->dssdev->driver) {
308 omap_dss_put_device(hdmi_data->dssdev);
312 if (hdmi_data->dssdev->type == OMAP_DISPLAY_TYPE_HDMI) {
313 hdmi_dev_found = true;
318 if (!hdmi_dev_found) {
319 dev_err(&pdev->dev, "no driver for HDMI display found\n");
323 dev_set_drvdata(&pdev->dev, hdmi_data);
324 ret = snd_soc_register_dai(&pdev->dev, &omap_hdmi_dai);
329 static int omap_hdmi_remove(struct platform_device *pdev)
331 struct hdmi_priv *hdmi_data = dev_get_drvdata(&pdev->dev);
333 snd_soc_unregister_dai(&pdev->dev);
335 if (hdmi_data == NULL) {
336 dev_err(&pdev->dev, "cannot obtain HDMi data\n");
340 omap_dss_put_device(hdmi_data->dssdev);
344 static struct platform_driver hdmi_dai_driver = {
347 .owner = THIS_MODULE,
349 .probe = omap_hdmi_probe,
350 .remove = omap_hdmi_remove,
353 module_platform_driver(hdmi_dai_driver);
355 MODULE_AUTHOR("Jorge Candelaria <jorge.candelaria@ti.com>");
356 MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
357 MODULE_DESCRIPTION("OMAP HDMI SoC Interface");
358 MODULE_LICENSE("GPL");
359 MODULE_ALIAS("platform:" DRV_NAME);