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>
39 #include "omap-hdmi.h"
41 #define DRV_NAME "omap-hdmi-audio-dai"
44 struct omap_pcm_dma_data dma_params;
45 struct omap_dss_audio dss_audio;
46 struct snd_aes_iec958 iec;
47 struct snd_cea_861_aud_if cea;
48 struct omap_dss_device *dssdev;
51 static int omap_hdmi_dai_startup(struct snd_pcm_substream *substream,
52 struct snd_soc_dai *dai)
54 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
57 * Make sure that the period bytes are multiple of the DMA packet size.
58 * Largest packet size we use is 32 32-bit words = 128 bytes
60 err = snd_pcm_hw_constraint_step(substream->runtime, 0,
61 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
63 dev_err(dai->dev, "could not apply constraint\n");
67 if (!priv->dssdev->driver->audio_supported(priv->dssdev)) {
68 dev_err(dai->dev, "audio not supported\n");
74 static int omap_hdmi_dai_prepare(struct snd_pcm_substream *substream,
75 struct snd_soc_dai *dai)
77 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
79 return priv->dssdev->driver->audio_enable(priv->dssdev);
82 static int omap_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
83 struct snd_pcm_hw_params *params,
84 struct snd_soc_dai *dai)
86 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
87 struct snd_aes_iec958 *iec = &priv->iec;
88 struct snd_cea_861_aud_if *cea = &priv->cea;
91 switch (params_format(params)) {
92 case SNDRV_PCM_FORMAT_S16_LE:
93 priv->dma_params.packet_size = 16;
95 case SNDRV_PCM_FORMAT_S24_LE:
96 priv->dma_params.packet_size = 32;
99 dev_err(dai->dev, "format not supported!\n");
103 priv->dma_params.data_type = OMAP_DMA_DATA_TYPE_S32;
105 snd_soc_dai_set_dma_data(dai, substream,
109 * fill the IEC-60958 channel status word
112 /* specify IEC-60958-3 (commercial use) */
113 iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
115 /* specify that the audio is LPCM*/
116 iec->status[0] &= ~IEC958_AES0_NONAUDIO;
118 iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
120 iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
122 iec->status[0] |= IEC958_AES1_PRO_MODE_NOTID;
124 iec->status[1] = IEC958_AES1_CON_GENERAL;
126 iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
128 iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
130 switch (params_rate(params)) {
132 iec->status[3] |= IEC958_AES3_CON_FS_32000;
135 iec->status[3] |= IEC958_AES3_CON_FS_44100;
138 iec->status[3] |= IEC958_AES3_CON_FS_48000;
141 iec->status[3] |= IEC958_AES3_CON_FS_88200;
144 iec->status[3] |= IEC958_AES3_CON_FS_96000;
147 iec->status[3] |= IEC958_AES3_CON_FS_176400;
150 iec->status[3] |= IEC958_AES3_CON_FS_192000;
153 dev_err(dai->dev, "rate not supported!\n");
157 /* specify the clock accuracy */
158 iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
161 * specify the word length. The same word length value can mean
162 * two different lengths. Hence, we need to specify the maximum
163 * word length as well.
165 switch (params_format(params)) {
166 case SNDRV_PCM_FORMAT_S16_LE:
167 iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
168 iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
170 case SNDRV_PCM_FORMAT_S24_LE:
171 iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
172 iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
175 dev_err(dai->dev, "format not supported!\n");
180 * Fill the CEA-861 audio infoframe (see spec for details)
183 cea->db1_ct_cc = (params_channels(params) - 1)
184 & CEA861_AUDIO_INFOFRAME_DB1CC;
185 cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
187 cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
188 cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
190 cea->db3 = 0; /* not used, all zeros */
193 * The OMAP HDMI IP requires to use the 8-channel channel code when
194 * transmitting more than two channels.
196 if (params_channels(params) == 2)
201 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
202 /* the expression is trivial but makes clear what we are doing */
203 cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
205 priv->dss_audio.iec = iec;
206 priv->dss_audio.cea = cea;
208 err = priv->dssdev->driver->audio_config(priv->dssdev,
214 static int omap_hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
215 struct snd_soc_dai *dai)
217 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
221 case SNDRV_PCM_TRIGGER_START:
222 case SNDRV_PCM_TRIGGER_RESUME:
223 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
224 err = priv->dssdev->driver->audio_start(priv->dssdev);
226 case SNDRV_PCM_TRIGGER_STOP:
227 case SNDRV_PCM_TRIGGER_SUSPEND:
228 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
229 priv->dssdev->driver->audio_stop(priv->dssdev);
237 static void omap_hdmi_dai_shutdown(struct snd_pcm_substream *substream,
238 struct snd_soc_dai *dai)
240 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
242 priv->dssdev->driver->audio_disable(priv->dssdev);
245 static const struct snd_soc_dai_ops omap_hdmi_dai_ops = {
246 .startup = omap_hdmi_dai_startup,
247 .hw_params = omap_hdmi_dai_hw_params,
248 .prepare = omap_hdmi_dai_prepare,
249 .trigger = omap_hdmi_dai_trigger,
250 .shutdown = omap_hdmi_dai_shutdown,
253 static struct snd_soc_dai_driver omap_hdmi_dai = {
257 .rates = OMAP_HDMI_RATES,
258 .formats = OMAP_HDMI_FORMATS,
260 .ops = &omap_hdmi_dai_ops,
263 static __devinit int omap_hdmi_probe(struct platform_device *pdev)
266 struct resource *hdmi_rsrc;
267 struct hdmi_priv *hdmi_data;
268 bool hdmi_dev_found = false;
270 hdmi_data = devm_kzalloc(&pdev->dev, sizeof(*hdmi_data), GFP_KERNEL);
271 if (hdmi_data == NULL) {
272 dev_err(&pdev->dev, "Cannot allocate memory for HDMI data\n");
276 hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
278 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_MEM HDMI\n");
282 hdmi_data->dma_params.port_addr = hdmi_rsrc->start
283 + OMAP_HDMI_AUDIO_DMA_PORT;
285 hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_DMA, 0);
287 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_DMA HDMI\n");
291 hdmi_data->dma_params.dma_req = hdmi_rsrc->start;
292 hdmi_data->dma_params.name = "HDMI playback";
293 hdmi_data->dma_params.sync_mode = OMAP_DMA_SYNC_PACKET;
296 * TODO: We assume that there is only one DSS HDMI device. Future
297 * OMAP implementations may support more than one HDMI devices and
298 * we should provided separate audio support for all of them.
300 /* Find an HDMI device. */
301 for_each_dss_dev(hdmi_data->dssdev) {
302 omap_dss_get_device(hdmi_data->dssdev);
304 if (!hdmi_data->dssdev->driver) {
305 omap_dss_put_device(hdmi_data->dssdev);
309 if (hdmi_data->dssdev->type == OMAP_DISPLAY_TYPE_HDMI) {
310 hdmi_dev_found = true;
315 if (!hdmi_dev_found) {
316 dev_err(&pdev->dev, "no driver for HDMI display found\n");
320 dev_set_drvdata(&pdev->dev, hdmi_data);
321 ret = snd_soc_register_dai(&pdev->dev, &omap_hdmi_dai);
326 static int __devexit omap_hdmi_remove(struct platform_device *pdev)
328 struct hdmi_priv *hdmi_data = dev_get_drvdata(&pdev->dev);
330 snd_soc_unregister_dai(&pdev->dev);
332 if (hdmi_data == NULL) {
333 dev_err(&pdev->dev, "cannot obtain HDMi data\n");
337 omap_dss_put_device(hdmi_data->dssdev);
341 static struct platform_driver hdmi_dai_driver = {
344 .owner = THIS_MODULE,
346 .probe = omap_hdmi_probe,
347 .remove = __devexit_p(omap_hdmi_remove),
350 module_platform_driver(hdmi_dai_driver);
352 MODULE_AUTHOR("Jorge Candelaria <jorge.candelaria@ti.com>");
353 MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
354 MODULE_DESCRIPTION("OMAP HDMI SoC Interface");
355 MODULE_LICENSE("GPL");
356 MODULE_ALIAS("platform:" DRV_NAME);