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
114 /* specify IEC-60958-3 (commercial use) */
115 iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
117 /* specify that the audio is LPCM*/
118 iec->status[0] &= ~IEC958_AES0_NONAUDIO;
120 iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
122 iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
124 iec->status[0] |= IEC958_AES1_PRO_MODE_NOTID;
126 iec->status[1] = IEC958_AES1_CON_GENERAL;
128 iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
130 iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
132 switch (params_rate(params)) {
134 iec->status[3] |= IEC958_AES3_CON_FS_32000;
137 iec->status[3] |= IEC958_AES3_CON_FS_44100;
140 iec->status[3] |= IEC958_AES3_CON_FS_48000;
143 iec->status[3] |= IEC958_AES3_CON_FS_88200;
146 iec->status[3] |= IEC958_AES3_CON_FS_96000;
149 iec->status[3] |= IEC958_AES3_CON_FS_176400;
152 iec->status[3] |= IEC958_AES3_CON_FS_192000;
155 dev_err(dai->dev, "rate not supported!\n");
159 /* specify the clock accuracy */
160 iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
163 * specify the word length. The same word length value can mean
164 * two different lengths. Hence, we need to specify the maximum
165 * word length as well.
167 switch (params_format(params)) {
168 case SNDRV_PCM_FORMAT_S16_LE:
169 iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
170 iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
172 case SNDRV_PCM_FORMAT_S24_LE:
173 iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
174 iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
177 dev_err(dai->dev, "format not supported!\n");
182 * Fill the CEA-861 audio infoframe (see spec for details)
185 cea->db1_ct_cc = (params_channels(params) - 1)
186 & CEA861_AUDIO_INFOFRAME_DB1CC;
187 cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
189 cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
190 cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
192 cea->db3 = 0; /* not used, all zeros */
195 * The OMAP HDMI IP requires to use the 8-channel channel code when
196 * transmitting more than two channels.
198 if (params_channels(params) == 2)
203 cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
204 /* the expression is trivial but makes clear what we are doing */
205 cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
207 priv->dss_audio.iec = iec;
208 priv->dss_audio.cea = cea;
210 err = priv->dssdev->driver->audio_config(priv->dssdev,
216 static int omap_hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
217 struct snd_soc_dai *dai)
219 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
223 case SNDRV_PCM_TRIGGER_START:
224 case SNDRV_PCM_TRIGGER_RESUME:
225 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
226 err = priv->dssdev->driver->audio_start(priv->dssdev);
228 case SNDRV_PCM_TRIGGER_STOP:
229 case SNDRV_PCM_TRIGGER_SUSPEND:
230 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
231 priv->dssdev->driver->audio_stop(priv->dssdev);
239 static void omap_hdmi_dai_shutdown(struct snd_pcm_substream *substream,
240 struct snd_soc_dai *dai)
242 struct hdmi_priv *priv = snd_soc_dai_get_drvdata(dai);
244 priv->dssdev->driver->audio_disable(priv->dssdev);
247 static const struct snd_soc_dai_ops omap_hdmi_dai_ops = {
248 .startup = omap_hdmi_dai_startup,
249 .hw_params = omap_hdmi_dai_hw_params,
250 .prepare = omap_hdmi_dai_prepare,
251 .trigger = omap_hdmi_dai_trigger,
252 .shutdown = omap_hdmi_dai_shutdown,
255 static struct snd_soc_dai_driver omap_hdmi_dai = {
259 .rates = OMAP_HDMI_RATES,
260 .formats = OMAP_HDMI_FORMATS,
262 .ops = &omap_hdmi_dai_ops,
265 static __devinit int omap_hdmi_probe(struct platform_device *pdev)
268 struct resource *hdmi_rsrc;
269 struct hdmi_priv *hdmi_data;
270 bool hdmi_dev_found = false;
272 hdmi_data = devm_kzalloc(&pdev->dev, sizeof(*hdmi_data), GFP_KERNEL);
273 if (hdmi_data == NULL) {
274 dev_err(&pdev->dev, "Cannot allocate memory for HDMI data\n");
278 hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
280 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_MEM HDMI\n");
284 hdmi_data->dma_params.port_addr = hdmi_rsrc->start
285 + OMAP_HDMI_AUDIO_DMA_PORT;
287 hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_DMA, 0);
289 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_DMA HDMI\n");
293 hdmi_data->dma_params.dma_req = hdmi_rsrc->start;
294 hdmi_data->dma_params.name = "HDMI playback";
297 * TODO: We assume that there is only one DSS HDMI device. Future
298 * OMAP implementations may support more than one HDMI devices and
299 * we should provided separate audio support for all of them.
301 /* Find an HDMI device. */
302 for_each_dss_dev(hdmi_data->dssdev) {
303 omap_dss_get_device(hdmi_data->dssdev);
305 if (!hdmi_data->dssdev->driver) {
306 omap_dss_put_device(hdmi_data->dssdev);
310 if (hdmi_data->dssdev->type == OMAP_DISPLAY_TYPE_HDMI) {
311 hdmi_dev_found = true;
316 if (!hdmi_dev_found) {
317 dev_err(&pdev->dev, "no driver for HDMI display found\n");
321 dev_set_drvdata(&pdev->dev, hdmi_data);
322 ret = snd_soc_register_dai(&pdev->dev, &omap_hdmi_dai);
327 static int __devexit omap_hdmi_remove(struct platform_device *pdev)
329 struct hdmi_priv *hdmi_data = dev_get_drvdata(&pdev->dev);
331 snd_soc_unregister_dai(&pdev->dev);
333 if (hdmi_data == NULL) {
334 dev_err(&pdev->dev, "cannot obtain HDMi data\n");
338 omap_dss_put_device(hdmi_data->dssdev);
342 static struct platform_driver hdmi_dai_driver = {
345 .owner = THIS_MODULE,
347 .probe = omap_hdmi_probe,
348 .remove = __devexit_p(omap_hdmi_remove),
351 module_platform_driver(hdmi_dai_driver);
353 MODULE_AUTHOR("Jorge Candelaria <jorge.candelaria@ti.com>");
354 MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
355 MODULE_DESCRIPTION("OMAP HDMI SoC Interface");
356 MODULE_LICENSE("GPL");
357 MODULE_ALIAS("platform:" DRV_NAME);