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
);