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