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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 #include "tegra_asoc_utils.h"
 33 
 34 #define DRV_NAME "tegra-snd-wm9712"
 35 
 36 struct tegra_wm9712 {
 37         struct platform_device *codec;
 38         struct tegra_asoc_utils_data util_data;
 39 };
 40 
 41 static const struct snd_soc_dapm_widget tegra_wm9712_dapm_widgets[] = {
 42         SND_SOC_DAPM_HP("Headphone", NULL),
 43         SND_SOC_DAPM_LINE("LineIn", NULL),
 44         SND_SOC_DAPM_MIC("Mic", NULL),
 45 };
 46 
 47 static int tegra_wm9712_init(struct snd_soc_pcm_runtime *rtd)
 48 {
 49         return snd_soc_dapm_force_enable_pin(&rtd->card->dapm, "Mic Bias");
 50 }
 51 
 52 static struct snd_soc_dai_link tegra_wm9712_dai = {
 53         .name = "AC97 HiFi",
 54         .stream_name = "AC97 HiFi",
 55         .codec_dai_name = "wm9712-hifi",
 56         .codec_name = "wm9712-codec",
 57         .init = tegra_wm9712_init,
 58 };
 59 
 60 static struct snd_soc_card snd_soc_tegra_wm9712 = {
 61         .name = "tegra-wm9712",
 62         .owner = THIS_MODULE,
 63         .dai_link = &tegra_wm9712_dai,
 64         .num_links = 1,
 65 
 66         .dapm_widgets = tegra_wm9712_dapm_widgets,
 67         .num_dapm_widgets = ARRAY_SIZE(tegra_wm9712_dapm_widgets),
 68         .fully_routed = true,
 69 };
 70 
 71 static int tegra_wm9712_driver_probe(struct platform_device *pdev)
 72 {
 73         struct device_node *np = pdev->dev.of_node;
 74         struct snd_soc_card *card = &snd_soc_tegra_wm9712;
 75         struct tegra_wm9712 *machine;
 76         int ret;
 77 
 78         machine = devm_kzalloc(&pdev->dev, sizeof(struct tegra_wm9712),
 79                                GFP_KERNEL);
 80         if (!machine)
 81                 return -ENOMEM;
 82 
 83         card->dev = &pdev->dev;
 84         snd_soc_card_set_drvdata(card, machine);
 85 
 86         machine->codec = platform_device_alloc("wm9712-codec", -1);
 87         if (!machine->codec) {
 88                 dev_err(&pdev->dev, "Can't allocate wm9712 platform device\n");
 89                 return -ENOMEM;
 90         }
 91 
 92         ret = platform_device_add(machine->codec);
 93         if (ret)
 94                 goto codec_put;
 95 
 96         ret = snd_soc_of_parse_card_name(card, "nvidia,model");
 97         if (ret)
 98                 goto codec_unregister;
 99 
100         ret = snd_soc_of_parse_audio_routing(card, "nvidia,audio-routing");
101         if (ret)
102                 goto codec_unregister;
103 
104         tegra_wm9712_dai.cpu_of_node = of_parse_phandle(np,
105                                        "nvidia,ac97-controller", 0);
106         if (!tegra_wm9712_dai.cpu_of_node) {
107                 dev_err(&pdev->dev,
108                         "Property 'nvidia,ac97-controller' missing or invalid\n");
109                 ret = -EINVAL;
110                 goto codec_unregister;
111         }
112 
113         tegra_wm9712_dai.platform_of_node = tegra_wm9712_dai.cpu_of_node;
114 
115         ret = tegra_asoc_utils_init(&machine->util_data, &pdev->dev);
116         if (ret)
117                 goto codec_unregister;
118 
119         ret = tegra_asoc_utils_set_ac97_rate(&machine->util_data);
120         if (ret)
121                 goto asoc_utils_fini;
122 
123         ret = snd_soc_register_card(card);
124         if (ret) {
125                 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n",
126                         ret);
127                 goto asoc_utils_fini;
128         }
129 
130         return 0;
131 
132 asoc_utils_fini:
133         tegra_asoc_utils_fini(&machine->util_data);
134 codec_unregister:
135         platform_device_del(machine->codec);
136 codec_put:
137         platform_device_put(machine->codec);
138         return ret;
139 }
140 
141 static int tegra_wm9712_driver_remove(struct platform_device *pdev)
142 {
143         struct snd_soc_card *card = platform_get_drvdata(pdev);
144         struct tegra_wm9712 *machine = snd_soc_card_get_drvdata(card);
145 
146         snd_soc_unregister_card(card);
147 
148         tegra_asoc_utils_fini(&machine->util_data);
149 
150         platform_device_unregister(machine->codec);
151 
152         return 0;
153 }
154 
155 static const struct of_device_id tegra_wm9712_of_match[] = {
156         { .compatible = "nvidia,tegra-audio-wm9712", },
157         {},
158 };
159 
160 static struct platform_driver tegra_wm9712_driver = {
161         .driver = {
162                 .name = DRV_NAME,
163                 .pm = &snd_soc_pm_ops,
164                 .of_match_table = tegra_wm9712_of_match,
165         },
166         .probe = tegra_wm9712_driver_probe,
167         .remove = tegra_wm9712_driver_remove,
168 };
169 module_platform_driver(tegra_wm9712_driver);
170 
171 MODULE_AUTHOR("Lucas Stach");
172 MODULE_DESCRIPTION("Tegra+WM9712 machine ASoC driver");
173 MODULE_LICENSE("GPL v2");
174 MODULE_ALIAS("platform:" DRV_NAME);
175 MODULE_DEVICE_TABLE(of, tegra_wm9712_of_match);
176 

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