1 /*
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
24 #include <linux/module.h>
25 #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
omap4_hdmi_dai_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params)32 static 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
61 static struct snd_soc_ops omap4_hdmi_dai_ops = {
62 .hw_params = omap4_hdmi_dai_hw_params,
63 };
64
65 static 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
75 static struct snd_soc_card snd_soc_omap4_hdmi = {
76 .name = "OMAP4HDMI",
77 .owner = THIS_MODULE,
78 .dai_link = &omap4_hdmi_dai,
79 .num_links = 1,
80 };
81
omap4_hdmi_probe(struct platform_device * pdev)82 static __devinit int omap4_hdmi_probe(struct platform_device *pdev)
83 {
84 struct snd_soc_card *card = &snd_soc_omap4_hdmi;
85 int ret;
86
87 card->dev = &pdev->dev;
88
89 ret = snd_soc_register_card(card);
90 if (ret) {
91 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
92 card->dev = NULL;
93 return ret;
94 }
95 return 0;
96 }
97
omap4_hdmi_remove(struct platform_device * pdev)98 static int __devexit omap4_hdmi_remove(struct platform_device *pdev)
99 {
100 struct snd_soc_card *card = platform_get_drvdata(pdev);
101
102 snd_soc_unregister_card(card);
103 card->dev = NULL;
104 return 0;
105 }
106
107 static struct platform_driver omap4_hdmi_driver = {
108 .driver = {
109 .name = "omap4-hdmi-audio",
110 .owner = THIS_MODULE,
111 },
112 .probe = omap4_hdmi_probe,
113 .remove = __devexit_p(omap4_hdmi_remove),
114 };
115
116 module_platform_driver(omap4_hdmi_driver);
117
118 MODULE_AUTHOR("Ricardo Neri <ricardo.neri@ti.com>");
119 MODULE_DESCRIPTION("OMAP4 HDMI machine ASoC driver");
120 MODULE_LICENSE("GPL");
121 MODULE_ALIAS("platform:" DRV_NAME);
122