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Linux/sound/soc/tegra/tegra_wm9712.c

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  1 /*
  2  * tegra20_wm9712.c - Tegra machine ASoC driver for boards using WM9712 codec.
  3  *
  4  * Copyright 2012 Lucas Stach <dev@lynxeye.de>
  5  *
  6  * Partly based on code copyright/by:
  7  * Copyright 2011,2012 Toradex Inc.
  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  */
 19 
 20 #include <linux/module.h>
 21 #include <linux/platform_device.h>
 22 #include <linux/slab.h>
 23 #include <linux/gpio.h>
 24 #include <linux/of_gpio.h>
 25 
 26 #include <sound/core.h>
 27 #include <sound/jack.h>
 28 #include <sound/pcm.h>
 29 #include <sound/pcm_params.h>
 30 #include <sound/soc.h>
 31 
 32 #define DRV_NAME "tegra-snd-wm9712"
 33 
 34 struct tegra_wm9712 {
 35         struct platform_device *codec;
 36 };
 37 
 38 static const struct snd_soc_dapm_widget tegra_wm9712_dapm_widgets[] = {
 39         SND_SOC_DAPM_HP("Headphone", NULL),
 40         SND_SOC_DAPM_LINE("LineIn", NULL),
 41         SND_SOC_DAPM_MIC("Mic", NULL),
 42 };
 43 
 44 static int tegra_wm9712_init(struct snd_soc_pcm_runtime *rtd)
 45 {
 46         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 47         struct snd_soc_codec *codec = codec_dai->codec;
 48         struct snd_soc_dapm_context *dapm = &codec->dapm;
 49 
 50         snd_soc_dapm_force_enable_pin(dapm, "Mic Bias");
 51 
 52         return snd_soc_dapm_sync(dapm);
 53 }
 54 
 55 static struct snd_soc_dai_link tegra_wm9712_dai = {
 56         .name = "AC97 HiFi",
 57         .stream_name = "AC97 HiFi",
 58         .cpu_dai_name = "tegra20-ac97",
 59         .codec_dai_name = "wm9712-hifi",
 60         .codec_name = "wm9712-codec",
 61         .init = tegra_wm9712_init,
 62 };
 63 
 64 static struct snd_soc_card snd_soc_tegra_wm9712 = {
 65         .name = "tegra-wm9712",
 66         .owner = THIS_MODULE,
 67         .dai_link = &tegra_wm9712_dai,
 68         .num_links = 1,
 69 
 70         .dapm_widgets = tegra_wm9712_dapm_widgets,
 71         .num_dapm_widgets = ARRAY_SIZE(tegra_wm9712_dapm_widgets),
 72         .fully_routed = true,
 73 };
 74 
 75 static int tegra_wm9712_driver_probe(struct platform_device *pdev)
 76 {
 77         struct device_node *np = pdev->dev.of_node;
 78         struct snd_soc_card *card = &snd_soc_tegra_wm9712;
 79         struct tegra_wm9712 *machine;
 80         int ret;
 81 
 82         machine = devm_kzalloc(&pdev->dev, sizeof(struct tegra_wm9712),
 83                                GFP_KERNEL);
 84         if (!machine) {
 85                 dev_err(&pdev->dev, "Can't allocate tegra_wm9712 struct\n");
 86                 return -ENOMEM;
 87         }
 88 
 89         card->dev = &pdev->dev;
 90         platform_set_drvdata(pdev, card);
 91         snd_soc_card_set_drvdata(card, machine);
 92 
 93         machine->codec = platform_device_alloc("wm9712-codec", -1);
 94         if (!machine->codec) {
 95                 dev_err(&pdev->dev, "Can't allocate wm9712 platform device\n");
 96                 return -ENOMEM;
 97         }
 98 
 99         ret = platform_device_add(machine->codec);
100         if (ret)
101                 goto codec_put;
102 
103         ret = snd_soc_of_parse_card_name(card, "nvidia,model");
104         if (ret)
105                 goto codec_unregister;
106 
107         ret = snd_soc_of_parse_audio_routing(card, "nvidia,audio-routing");
108         if (ret)
109                 goto codec_unregister;
110 
111         tegra_wm9712_dai.cpu_of_node = of_parse_phandle(np,
112                                        "nvidia,ac97-controller", 0);
113         if (!tegra_wm9712_dai.cpu_of_node) {
114                 dev_err(&pdev->dev,
115                         "Property 'nvidia,ac97-controller' missing or invalid\n");
116                 ret = -EINVAL;
117                 goto codec_unregister;
118         }
119 
120         tegra_wm9712_dai.platform_of_node = tegra_wm9712_dai.cpu_of_node;
121 
122         ret = snd_soc_register_card(card);
123         if (ret) {
124                 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n",
125                         ret);
126                 goto codec_unregister;
127         }
128 
129         return 0;
130 
131 codec_unregister:
132         platform_device_del(machine->codec);
133 codec_put:
134         platform_device_put(machine->codec);
135         return ret;
136 }
137 
138 static int tegra_wm9712_driver_remove(struct platform_device *pdev)
139 {
140         struct snd_soc_card *card = platform_get_drvdata(pdev);
141         struct tegra_wm9712 *machine = snd_soc_card_get_drvdata(card);
142 
143         snd_soc_unregister_card(card);
144 
145         platform_device_unregister(machine->codec);
146 
147         return 0;
148 }
149 
150 static const struct of_device_id tegra_wm9712_of_match[] = {
151         { .compatible = "nvidia,tegra-audio-wm9712", },
152         {},
153 };
154 
155 static struct platform_driver tegra_wm9712_driver = {
156         .driver = {
157                 .name = DRV_NAME,
158                 .owner = THIS_MODULE,
159                 .pm = &snd_soc_pm_ops,
160                 .of_match_table = tegra_wm9712_of_match,
161         },
162         .probe = tegra_wm9712_driver_probe,
163         .remove = tegra_wm9712_driver_remove,
164 };
165 module_platform_driver(tegra_wm9712_driver);
166 
167 MODULE_AUTHOR("Lucas Stach");
168 MODULE_DESCRIPTION("Tegra+WM9712 machine ASoC driver");
169 MODULE_LICENSE("GPL v2");
170 MODULE_ALIAS("platform:" DRV_NAME);
171 MODULE_DEVICE_TABLE(of, tegra_wm9712_of_match);
172 

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