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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         struct snd_soc_dai *codec_dai = rtd->codec_dai;
 50         struct snd_soc_codec *codec = codec_dai->codec;
 51         struct snd_soc_dapm_context *dapm = &codec->dapm;
 52 
 53         snd_soc_dapm_force_enable_pin(dapm, "Mic Bias");
 54 
 55         return snd_soc_dapm_sync(dapm);
 56 }
 57 
 58 static struct snd_soc_dai_link tegra_wm9712_dai = {
 59         .name = "AC97 HiFi",
 60         .stream_name = "AC97 HiFi",
 61         .codec_dai_name = "wm9712-hifi",
 62         .codec_name = "wm9712-codec",
 63         .init = tegra_wm9712_init,
 64 };
 65 
 66 static struct snd_soc_card snd_soc_tegra_wm9712 = {
 67         .name = "tegra-wm9712",
 68         .owner = THIS_MODULE,
 69         .dai_link = &tegra_wm9712_dai,
 70         .num_links = 1,
 71 
 72         .dapm_widgets = tegra_wm9712_dapm_widgets,
 73         .num_dapm_widgets = ARRAY_SIZE(tegra_wm9712_dapm_widgets),
 74         .fully_routed = true,
 75 };
 76 
 77 static int tegra_wm9712_driver_probe(struct platform_device *pdev)
 78 {
 79         struct device_node *np = pdev->dev.of_node;
 80         struct snd_soc_card *card = &snd_soc_tegra_wm9712;
 81         struct tegra_wm9712 *machine;
 82         int ret;
 83 
 84         machine = devm_kzalloc(&pdev->dev, sizeof(struct tegra_wm9712),
 85                                GFP_KERNEL);
 86         if (!machine) {
 87                 dev_err(&pdev->dev, "Can't allocate tegra_wm9712 struct\n");
 88                 return -ENOMEM;
 89         }
 90 
 91         card->dev = &pdev->dev;
 92         platform_set_drvdata(pdev, card);
 93         snd_soc_card_set_drvdata(card, machine);
 94 
 95         machine->codec = platform_device_alloc("wm9712-codec", -1);
 96         if (!machine->codec) {
 97                 dev_err(&pdev->dev, "Can't allocate wm9712 platform device\n");
 98                 return -ENOMEM;
 99         }
100 
101         ret = platform_device_add(machine->codec);
102         if (ret)
103                 goto codec_put;
104 
105         ret = snd_soc_of_parse_card_name(card, "nvidia,model");
106         if (ret)
107                 goto codec_unregister;
108 
109         ret = snd_soc_of_parse_audio_routing(card, "nvidia,audio-routing");
110         if (ret)
111                 goto codec_unregister;
112 
113         tegra_wm9712_dai.cpu_of_node = of_parse_phandle(np,
114                                        "nvidia,ac97-controller", 0);
115         if (!tegra_wm9712_dai.cpu_of_node) {
116                 dev_err(&pdev->dev,
117                         "Property 'nvidia,ac97-controller' missing or invalid\n");
118                 ret = -EINVAL;
119                 goto codec_unregister;
120         }
121 
122         tegra_wm9712_dai.platform_of_node = tegra_wm9712_dai.cpu_of_node;
123 
124         ret = tegra_asoc_utils_init(&machine->util_data, &pdev->dev);
125         if (ret)
126                 goto codec_unregister;
127 
128         ret = tegra_asoc_utils_set_ac97_rate(&machine->util_data);
129         if (ret)
130                 goto asoc_utils_fini;
131 
132         ret = snd_soc_register_card(card);
133         if (ret) {
134                 dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n",
135                         ret);
136                 goto asoc_utils_fini;
137         }
138 
139         return 0;
140 
141 asoc_utils_fini:
142         tegra_asoc_utils_fini(&machine->util_data);
143 codec_unregister:
144         platform_device_del(machine->codec);
145 codec_put:
146         platform_device_put(machine->codec);
147         return ret;
148 }
149 
150 static int tegra_wm9712_driver_remove(struct platform_device *pdev)
151 {
152         struct snd_soc_card *card = platform_get_drvdata(pdev);
153         struct tegra_wm9712 *machine = snd_soc_card_get_drvdata(card);
154 
155         snd_soc_unregister_card(card);
156 
157         tegra_asoc_utils_fini(&machine->util_data);
158 
159         platform_device_unregister(machine->codec);
160 
161         return 0;
162 }
163 
164 static const struct of_device_id tegra_wm9712_of_match[] = {
165         { .compatible = "nvidia,tegra-audio-wm9712", },
166         {},
167 };
168 
169 static struct platform_driver tegra_wm9712_driver = {
170         .driver = {
171                 .name = DRV_NAME,
172                 .owner = THIS_MODULE,
173                 .pm = &snd_soc_pm_ops,
174                 .of_match_table = tegra_wm9712_of_match,
175         },
176         .probe = tegra_wm9712_driver_probe,
177         .remove = tegra_wm9712_driver_remove,
178 };
179 module_platform_driver(tegra_wm9712_driver);
180 
181 MODULE_AUTHOR("Lucas Stach");
182 MODULE_DESCRIPTION("Tegra+WM9712 machine ASoC driver");
183 MODULE_LICENSE("GPL v2");
184 MODULE_ALIAS("platform:" DRV_NAME);
185 MODULE_DEVICE_TABLE(of, tegra_wm9712_of_match);
186 

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