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Linux/sound/soc/tegra/tegra_wm9712.c

  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                 dev_err(&pdev->dev, "Can't allocate tegra_wm9712 struct\n");
 82                 return -ENOMEM;
 83         }
 84 
 85         card->dev = &pdev->dev;
 86         platform_set_drvdata(pdev, card);
 87         snd_soc_card_set_drvdata(card, machine);
 88 
 89         machine->codec = platform_device_alloc("wm9712-codec", -1);
 90         if (!machine->codec) {
 91                 dev_err(&pdev->dev, "Can't allocate wm9712 platform device\n");
 92                 return -ENOMEM;
 93         }
 94 
 95         ret = platform_device_add(machine->codec);
 96         if (ret)
 97                 goto codec_put;
 98 
 99         ret = snd_soc_of_parse_card_name(card, "nvidia,model");
100         if (ret)
101                 goto codec_unregister;
102 
103         ret = snd_soc_of_parse_audio_routing(card, "nvidia,audio-routing");
104         if (ret)
105                 goto codec_unregister;
106 
107         tegra_wm9712_dai.cpu_of_node = of_parse_phandle(np,
108                                        "nvidia,ac97-controller", 0);
109         if (!tegra_wm9712_dai.cpu_of_node) {
110                 dev_err(&pdev->dev,
111                         "Property 'nvidia,ac97-controller' missing or invalid\n");
112                 ret = -EINVAL;
113                 goto codec_unregister;
114         }
115 
116         tegra_wm9712_dai.platform_of_node = tegra_wm9712_dai.cpu_of_node;
117 
118         ret = tegra_asoc_utils_init(&machine->util_data, &pdev->dev);
119         if (ret)
120                 goto codec_unregister;
121 
122         ret = tegra_asoc_utils_set_ac97_rate(&machine->util_data);
123         if (ret)
124                 goto asoc_utils_fini;
125 
126         ret = snd_soc_register_card(card);
127         if (ret) {
128                 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n",
129                         ret);
130                 goto asoc_utils_fini;
131         }
132 
133         return 0;
134 
135 asoc_utils_fini:
136         tegra_asoc_utils_fini(&machine->util_data);
137 codec_unregister:
138         platform_device_del(machine->codec);
139 codec_put:
140         platform_device_put(machine->codec);
141         return ret;
142 }
143 
144 static int tegra_wm9712_driver_remove(struct platform_device *pdev)
145 {
146         struct snd_soc_card *card = platform_get_drvdata(pdev);
147         struct tegra_wm9712 *machine = snd_soc_card_get_drvdata(card);
148 
149         snd_soc_unregister_card(card);
150 
151         tegra_asoc_utils_fini(&machine->util_data);
152 
153         platform_device_unregister(machine->codec);
154 
155         return 0;
156 }
157 
158 static const struct of_device_id tegra_wm9712_of_match[] = {
159         { .compatible = "nvidia,tegra-audio-wm9712", },
160         {},
161 };
162 
163 static struct platform_driver tegra_wm9712_driver = {
164         .driver = {
165                 .name = DRV_NAME,
166                 .pm = &snd_soc_pm_ops,
167                 .of_match_table = tegra_wm9712_of_match,
168         },
169         .probe = tegra_wm9712_driver_probe,
170         .remove = tegra_wm9712_driver_remove,
171 };
172 module_platform_driver(tegra_wm9712_driver);
173 
174 MODULE_AUTHOR("Lucas Stach");
175 MODULE_DESCRIPTION("Tegra+WM9712 machine ASoC driver");
176 MODULE_LICENSE("GPL v2");
177 MODULE_ALIAS("platform:" DRV_NAME);
178 MODULE_DEVICE_TABLE(of, tegra_wm9712_of_match);
179 

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