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Ricardo Neri55b95e02011-06-02 15:44:46 -05001/*
2 * omap4-hdmi-card.c
3 *
4 * OMAP ALSA SoC machine driver for TI OMAP4 HDMI
5 * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
6 * Author: Ricardo Neri <ricardo.neri@ti.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 *
22 */
23
Paul Gortmakerda155d52011-07-15 12:38:28 -040024#include <linux/module.h>
Ricardo Neri55b95e02011-06-02 15:44:46 -050025#include <sound/pcm.h>
26#include <sound/soc.h>
27#include <asm/mach-types.h>
28#include <video/omapdss.h>
29
30#define DRV_NAME "omap4-hdmi-audio"
31
32static int omap4_hdmi_dai_hw_params(struct snd_pcm_substream *substream,
33 struct snd_pcm_hw_params *params)
34{
35 int i;
36 struct omap_overlay_manager *mgr = NULL;
37 struct device *dev = substream->pcm->card->dev;
38
39 /* Find DSS HDMI device */
40 for (i = 0; i < omap_dss_get_num_overlay_managers(); i++) {
41 mgr = omap_dss_get_overlay_manager(i);
42 if (mgr && mgr->device
43 && mgr->device->type == OMAP_DISPLAY_TYPE_HDMI)
44 break;
45 }
46
47 if (i == omap_dss_get_num_overlay_managers()) {
48 dev_err(dev, "HDMI display device not found!\n");
49 return -ENODEV;
50 }
51
52 /* Make sure HDMI is power-on to avoid L3 interconnect errors */
53 if (mgr->device->state != OMAP_DSS_DISPLAY_ACTIVE) {
54 dev_err(dev, "HDMI display is not active!\n");
55 return -EIO;
56 }
57
58 return 0;
59}
60
61static struct snd_soc_ops omap4_hdmi_dai_ops = {
62 .hw_params = omap4_hdmi_dai_hw_params,
63};
64
65static struct snd_soc_dai_link omap4_hdmi_dai = {
66 .name = "HDMI",
67 .stream_name = "HDMI",
68 .cpu_dai_name = "hdmi-audio-dai",
69 .platform_name = "omap-pcm-audio",
70 .codec_name = "omapdss_hdmi",
71 .codec_dai_name = "hdmi-audio-codec",
72 .ops = &omap4_hdmi_dai_ops,
73};
74
75static struct snd_soc_card snd_soc_omap4_hdmi = {
76 .name = "OMAP4HDMI",
77 .dai_link = &omap4_hdmi_dai,
78 .num_links = 1,
79};
80
81static __devinit int omap4_hdmi_probe(struct platform_device *pdev)
82{
83 struct snd_soc_card *card = &snd_soc_omap4_hdmi;
84 int ret;
85
86 card->dev = &pdev->dev;
87
88 ret = snd_soc_register_card(card);
89 if (ret) {
90 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
91 card->dev = NULL;
92 return ret;
93 }
94 return 0;
95}
96
97static int __devexit omap4_hdmi_remove(struct platform_device *pdev)
98{
99 struct snd_soc_card *card = platform_get_drvdata(pdev);
100
101 snd_soc_unregister_card(card);
102 card->dev = NULL;
103 return 0;
104}
105
106static struct platform_driver omap4_hdmi_driver = {
107 .driver = {
108 .name = "omap4-hdmi-audio",
109 .owner = THIS_MODULE,
110 },
111 .probe = omap4_hdmi_probe,
112 .remove = __devexit_p(omap4_hdmi_remove),
113};
114
115static int __init omap4_hdmi_init(void)
116{
117 return platform_driver_register(&omap4_hdmi_driver);
118}
119module_init(omap4_hdmi_init);
120
121static void __exit omap4_hdmi_exit(void)
122{
123 platform_driver_unregister(&omap4_hdmi_driver);
124}
125module_exit(omap4_hdmi_exit);
126
127MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
128MODULE_DESCRIPTION("OMAP4 HDMI machine ASoC driver");
129MODULE_LICENSE("GPL");
130MODULE_ALIAS("platform:" DRV_NAME);