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