tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * omap-hdmi.c
3 *
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>
8 *
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.
12 *
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.
17 *
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
21 * 02110-1301 USA
22 *
23 */
24
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
34#include <plat/dma.h>
35#include "omap-pcm.h"
36#include "omap-hdmi.h"
37
38#define DRV_NAME "hdmi-audio-dai"
39
40static struct omap_pcm_dma_data omap_hdmi_dai_dma_params = {
41 .name = "HDMI playback",
42 .sync_mode = OMAP_DMA_SYNC_PACKET,
43};
44
45static int omap_hdmi_dai_startup(struct snd_pcm_substream *substream,
46 struct snd_soc_dai *dai)
47{
48 int err;
49 /*
50 * Make sure that the period bytes are multiple of the DMA packet size.
51 * Largest packet size we use is 32 32-bit words = 128 bytes
52 */
53 err = snd_pcm_hw_constraint_step(substream->runtime, 0,
54 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
55 if (err < 0)
56 return err;
57
58 return 0;
59}
60
61static int omap_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
62 struct snd_pcm_hw_params *params,
63 struct snd_soc_dai *dai)
64{
65 int err = 0;
66
67 switch (params_format(params)) {
68 case SNDRV_PCM_FORMAT_S16_LE:
69 omap_hdmi_dai_dma_params.packet_size = 16;
70 break;
71 case SNDRV_PCM_FORMAT_S24_LE:
72 omap_hdmi_dai_dma_params.packet_size = 32;
73 break;
74 default:
75 err = -EINVAL;
76 }
77
78 omap_hdmi_dai_dma_params.data_type = OMAP_DMA_DATA_TYPE_S32;
79
80 snd_soc_dai_set_dma_data(dai, substream,
81 &omap_hdmi_dai_dma_params);
82
83 return err;
84}
85
86static struct snd_soc_dai_ops omap_hdmi_dai_ops = {
87 .startup = omap_hdmi_dai_startup,
88 .hw_params = omap_hdmi_dai_hw_params,
89};
90
91static struct snd_soc_dai_driver omap_hdmi_dai = {
92 .playback = {
93 .channels_min = 2,
94 .channels_max = 2,
95 .rates = OMAP_HDMI_RATES,
96 .formats = OMAP_HDMI_FORMATS,
97 },
98 .ops = &omap_hdmi_dai_ops,
99};
100
101static __devinit int omap_hdmi_probe(struct platform_device *pdev)
102{
103 int ret;
104 struct resource *hdmi_rsrc;
105
106 hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_MEM, 0);
107 if (!hdmi_rsrc) {
108 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_MEM HDMI\n");
109 return -EINVAL;
110 }
111
112 omap_hdmi_dai_dma_params.port_addr = hdmi_rsrc->start
113 + OMAP_HDMI_AUDIO_DMA_PORT;
114
115 hdmi_rsrc = platform_get_resource(pdev, IORESOURCE_DMA, 0);
116 if (!hdmi_rsrc) {
117 dev_err(&pdev->dev, "Cannot obtain IORESOURCE_DMA HDMI\n");
118 return -EINVAL;
119 }
120
121 omap_hdmi_dai_dma_params.dma_req = hdmi_rsrc->start;
122
123 ret = snd_soc_register_dai(&pdev->dev, &omap_hdmi_dai);
124 return ret;
125}
126
127static int __devexit omap_hdmi_remove(struct platform_device *pdev)
128{
129 snd_soc_unregister_dai(&pdev->dev);
130 return 0;
131}
132
133static struct platform_driver hdmi_dai_driver = {
134 .driver = {
135 .name = DRV_NAME,
136 .owner = THIS_MODULE,
137 },
138 .probe = omap_hdmi_probe,
139 .remove = __devexit_p(omap_hdmi_remove),
140};
141
142static int __init hdmi_dai_init(void)
143{
144 return platform_driver_register(&hdmi_dai_driver);
145}
146module_init(hdmi_dai_init);
147
148static void __exit hdmi_dai_exit(void)
149{
150 platform_driver_unregister(&hdmi_dai_driver);
151}
152module_exit(hdmi_dai_exit);
153
154MODULE_AUTHOR("Jorge Candelaria <jorge.candelaria@ti.com>");
155MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
156MODULE_DESCRIPTION("OMAP HDMI SoC Interface");
157MODULE_LICENSE("GPL");
158MODULE_ALIAS("platform:" DRV_NAME);