kernel/sound/soc/sirf/sirf-audio.c

   1 /*
   2  * SiRF audio card driver
   3  *
   4  * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
   5  *
   6  * Licensed under GPLv2 or later.
   7  */
   8
   9 #include <linux/platform_device.h>
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/gpio.h>
  13 #include <linux/of_gpio.h>
  14 #include <sound/core.h>
  15 #include <sound/pcm.h>
  16 #include <sound/soc.h>
  17
  18 struct sirf_audio_card {
  19         unsigned int            gpio_hp_pa;
  20         unsigned int            gpio_spk_pa;
  21 };
  22
  23 static int sirf_audio_hp_event(struct snd_soc_dapm_widget *w,
  24                                 struct snd_kcontrol *ctrl, int event)
  25 {
  26         struct snd_soc_dapm_context *dapm = w->dapm;
  27         struct snd_soc_card *card = dapm->card;
  28         struct sirf_audio_card *sirf_audio_card = snd_soc_card_get_drvdata(card);
  29         int on = !SND_SOC_DAPM_EVENT_OFF(event);
  30         if (gpio_is_valid(sirf_audio_card->gpio_hp_pa))
  31                 gpio_set_value(sirf_audio_card->gpio_hp_pa, on);
  32         return 0;
  33 }
  34
  35 static int sirf_audio_spk_event(struct snd_soc_dapm_widget *w,
  36                                 struct snd_kcontrol *ctrl, int event)
  37 {
  38         struct snd_soc_dapm_context *dapm = w->dapm;
  39         struct snd_soc_card *card = dapm->card;
  40         struct sirf_audio_card *sirf_audio_card = snd_soc_card_get_drvdata(card);
  41         int on = !SND_SOC_DAPM_EVENT_OFF(event);
  42
  43         if (gpio_is_valid(sirf_audio_card->gpio_spk_pa))
  44                 gpio_set_value(sirf_audio_card->gpio_spk_pa, on);
  45
  46         return 0;
  47 }
  48 static const struct snd_soc_dapm_widget sirf_audio_dapm_widgets[] = {
  49         SND_SOC_DAPM_HP("Hp", sirf_audio_hp_event),
  50         SND_SOC_DAPM_SPK("Ext Spk", sirf_audio_spk_event),
  51         SND_SOC_DAPM_MIC("Ext Mic", NULL),
  52 };
  53
  54 static const struct snd_soc_dapm_route intercon[] = {
  55         {"Hp", NULL, "HPOUTL"},
  56         {"Hp", NULL, "HPOUTR"},
  57         {"Ext Spk", NULL, "SPKOUT"},
  58         {"MICIN1", NULL, "Mic Bias"},
  59         {"Mic Bias", NULL, "Ext Mic"},
  60 };
  61
  62 /* Digital audio interface glue - connects codec <--> CPU */
  63 static struct snd_soc_dai_link sirf_audio_dai_link[] = {
  64         {
  65                 .name = "SiRF audio card",
  66                 .stream_name = "SiRF audio HiFi",
  67                 .codec_dai_name = "sirf-audio-codec",
  68         },
  69 };
  70
  71 /* Audio machine driver */
  72 static struct snd_soc_card snd_soc_sirf_audio_card = {
  73         .name = "SiRF audio card",
  74         .owner = THIS_MODULE,
  75         .dai_link = sirf_audio_dai_link,
  76         .num_links = ARRAY_SIZE(sirf_audio_dai_link),
  77         .dapm_widgets = sirf_audio_dapm_widgets,
  78         .num_dapm_widgets = ARRAY_SIZE(sirf_audio_dapm_widgets),
  79         .dapm_routes = intercon,
  80         .num_dapm_routes = ARRAY_SIZE(intercon),
  81 };
  82
  83 static int sirf_audio_probe(struct platform_device *pdev)
  84 {
  85         struct snd_soc_card *card = &snd_soc_sirf_audio_card;
  86         struct sirf_audio_card *sirf_audio_card;
  87         int ret;
  88
  89         sirf_audio_card = devm_kzalloc(&pdev->dev, sizeof(struct sirf_audio_card),
  90                         GFP_KERNEL);
  91         if (sirf_audio_card == NULL)
  92                 return -ENOMEM;
  93
  94         sirf_audio_dai_link[0].cpu_of_node =
  95                 of_parse_phandle(pdev->dev.of_node, "sirf,audio-platform", 0);
  96         sirf_audio_dai_link[0].platform_of_node =
  97                 of_parse_phandle(pdev->dev.of_node, "sirf,audio-platform", 0);
  98         sirf_audio_dai_link[0].codec_of_node =
  99                 of_parse_phandle(pdev->dev.of_node, "sirf,audio-codec", 0);
 100         sirf_audio_card->gpio_spk_pa = of_get_named_gpio(pdev->dev.of_node,
 101                         "spk-pa-gpios", 0);
 102         sirf_audio_card->gpio_hp_pa =  of_get_named_gpio(pdev->dev.of_node,
 103                         "hp-pa-gpios", 0);
 104         if (gpio_is_valid(sirf_audio_card->gpio_spk_pa)) {
 105                 ret = devm_gpio_request_one(&pdev->dev,
 106                                 sirf_audio_card->gpio_spk_pa,
 107                                 GPIOF_OUT_INIT_LOW, "SPA_PA_SD");
 108                 if (ret) {
 109                         dev_err(&pdev->dev,
 110                                 "Failed to request GPIO_%d for reset: %d\n",
 111                                 sirf_audio_card->gpio_spk_pa, ret);
 112                         return ret;
 113                 }
 114         }
 115         if (gpio_is_valid(sirf_audio_card->gpio_hp_pa)) {
 116                 ret = devm_gpio_request_one(&pdev->dev,
 117                                 sirf_audio_card->gpio_hp_pa,
 118                                 GPIOF_OUT_INIT_LOW, "HP_PA_SD");
 119                 if (ret) {
 120                         dev_err(&pdev->dev,
 121                                 "Failed to request GPIO_%d for reset: %d\n",
 122                                 sirf_audio_card->gpio_hp_pa, ret);
 123                         return ret;
 124                 }
 125         }
 126
 127         card->dev = &pdev->dev;
 128         snd_soc_card_set_drvdata(card, sirf_audio_card);
 129
 130         ret = devm_snd_soc_register_card(&pdev->dev, card);
 131         if (ret)
 132                 dev_err(&pdev->dev, "snd_soc_register_card() failed:%d\n", ret);
 133
 134         return ret;
 135 }
 136
 137 static const struct of_device_id sirf_audio_of_match[] = {
 138         {.compatible = "sirf,sirf-audio-card", },
 139         { },
 140 };
 141 MODULE_DEVICE_TABLE(of, sirf_audio_of_match);
 142
 143 static struct platform_driver sirf_audio_driver = {
 144         .driver = {
 145                 .name = "sirf-audio-card",
 146                 .pm = &snd_soc_pm_ops,
 147                 .of_match_table = sirf_audio_of_match,
 148         },
 149         .probe = sirf_audio_probe,
 150 };
 151 module_platform_driver(sirf_audio_driver);
 152
 153 MODULE_AUTHOR("RongJun Ying <RongJun.Ying@csr.com>");
 154 MODULE_DESCRIPTION("ALSA SoC SIRF audio card driver");
 155 MODULE_LICENSE("GPL v2");