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Linux/sound/soc/codecs/ssm2305.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 //
  3 // Analog Devices SSM2305 Amplifier Driver
  4 //
  5 // Copyright (C) 2018 Pengutronix, Marco Felsch <kernel@pengutronix.de>
  6 //
  7 
  8 #include <linux/gpio/consumer.h>
  9 #include <linux/module.h>
 10 #include <sound/soc.h>
 11 
 12 #define DRV_NAME "ssm2305"
 13 
 14 struct ssm2305 {
 15         /* shutdown gpio  */
 16         struct gpio_desc *gpiod_shutdown;
 17 };
 18 
 19 static int ssm2305_power_event(struct snd_soc_dapm_widget *w,
 20                                struct snd_kcontrol *kctrl, int event)
 21 {
 22         struct snd_soc_component *c = snd_soc_dapm_to_component(w->dapm);
 23         struct ssm2305 *data = snd_soc_component_get_drvdata(c);
 24 
 25         gpiod_set_value_cansleep(data->gpiod_shutdown,
 26                                  SND_SOC_DAPM_EVENT_ON(event));
 27 
 28         return 0;
 29 }
 30 
 31 static const struct snd_soc_dapm_widget ssm2305_dapm_widgets[] = {
 32         /* Stereo input/output */
 33         SND_SOC_DAPM_INPUT("L_IN"),
 34         SND_SOC_DAPM_INPUT("R_IN"),
 35         SND_SOC_DAPM_OUTPUT("L_OUT"),
 36         SND_SOC_DAPM_OUTPUT("R_OUT"),
 37 
 38         SND_SOC_DAPM_SUPPLY("Power", SND_SOC_NOPM, 0, 0, ssm2305_power_event,
 39                             SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
 40 };
 41 
 42 static const struct snd_soc_dapm_route ssm2305_dapm_routes[] = {
 43         { "L_OUT", NULL, "L_IN" },
 44         { "R_OUT", NULL, "R_IN" },
 45         { "L_IN", NULL, "Power" },
 46         { "R_IN", NULL, "Power" },
 47 };
 48 
 49 static const struct snd_soc_component_driver ssm2305_component_driver = {
 50         .dapm_widgets           = ssm2305_dapm_widgets,
 51         .num_dapm_widgets       = ARRAY_SIZE(ssm2305_dapm_widgets),
 52         .dapm_routes            = ssm2305_dapm_routes,
 53         .num_dapm_routes        = ARRAY_SIZE(ssm2305_dapm_routes),
 54 };
 55 
 56 static int ssm2305_probe(struct platform_device *pdev)
 57 {
 58         struct device *dev = &pdev->dev;
 59         struct ssm2305 *priv;
 60         int err;
 61 
 62         /* Allocate the private data */
 63         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 64         if (!priv)
 65                 return -ENOMEM;
 66 
 67         platform_set_drvdata(pdev, priv);
 68 
 69         /* Get shutdown gpio */
 70         priv->gpiod_shutdown = devm_gpiod_get(dev, "shutdown",
 71                                               GPIOD_OUT_LOW);
 72         if (IS_ERR(priv->gpiod_shutdown)) {
 73                 err = PTR_ERR(priv->gpiod_shutdown);
 74                 if (err != -EPROBE_DEFER)
 75                         dev_err(dev, "Failed to get 'shutdown' gpio: %d\n",
 76                                 err);
 77                 return err;
 78         }
 79 
 80         return devm_snd_soc_register_component(dev, &ssm2305_component_driver,
 81                                                NULL, 0);
 82 }
 83 
 84 #ifdef CONFIG_OF
 85 static const struct of_device_id ssm2305_of_match[] = {
 86         { .compatible = "adi,ssm2305", },
 87         { }
 88 };
 89 MODULE_DEVICE_TABLE(of, ssm2305_of_match);
 90 #endif
 91 
 92 static struct platform_driver ssm2305_driver = {
 93         .driver = {
 94                 .name = DRV_NAME,
 95                 .of_match_table = of_match_ptr(ssm2305_of_match),
 96         },
 97         .probe = ssm2305_probe,
 98 };
 99 
100 module_platform_driver(ssm2305_driver);
101 
102 MODULE_DESCRIPTION("ASoC SSM2305 amplifier driver");
103 MODULE_AUTHOR("Marco Felsch <m.felsch@pengutronix.de>");
104 MODULE_LICENSE("GPL v2");
105 

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