ASoC: pcm3008: Convert to GPIO descriptors

This converts the PCM3008 driver to look up the GPIO lines
using descriptors.

Apparently there are no in-tree users of the platform data
struct, so users need to adopt.

New users can associate the GPIO lines with the platform
device "pcm3008-codec".

Signed-off-by: Linus Walleij <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/codecs/pcm3008.c

···
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/device.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <sound/core.h>
···
 #include <sound/initval.h>
 #include <sound/soc.h>
 
-#include "pcm3008.h"
+struct pcm3008 {
+	struct gpio_desc *dem0_pin;
+	struct gpio_desc *dem1_pin;
+	struct gpio_desc *pdad_pin;
+	struct gpio_desc *pdda_pin;
+};
 
 static int pcm3008_dac_ev(struct snd_soc_dapm_widget *w,
 			  struct snd_kcontrol *kcontrol,
 			  int event)
 {
 	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
-	struct pcm3008_setup_data *setup = component->dev->platform_data;
+	struct pcm3008 *pcm = component->dev->platform_data;
 
-	gpio_set_value_cansleep(setup->pdda_pin,
-				SND_SOC_DAPM_EVENT_ON(event));
+	gpiod_set_value_cansleep(pcm->pdda_pin,
+				 SND_SOC_DAPM_EVENT_ON(event));
 
 	return 0;
 }
···
 			  int event)
 {
 	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
-	struct pcm3008_setup_data *setup = component->dev->platform_data;
+	struct pcm3008 *pcm = component->dev->platform_data;
 
-	gpio_set_value_cansleep(setup->pdad_pin,
-				SND_SOC_DAPM_EVENT_ON(event));
+	gpiod_set_value_cansleep(pcm->pdad_pin,
+				 SND_SOC_DAPM_EVENT_ON(event));
 
 	return 0;
 }
···
 
 static int pcm3008_codec_probe(struct platform_device *pdev)
 {
-	struct pcm3008_setup_data *setup = pdev->dev.platform_data;
-	int ret;
+	struct device *dev = &pdev->dev;
+	struct pcm3008 *pcm;
 
-	if (!setup)
-		return -EINVAL;
+	pcm = devm_kzalloc(dev, sizeof(*pcm), GFP_KERNEL);
+	if (!pcm)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, pcm);
 
 	/* DEM1  DEM0  DE-EMPHASIS_MODE
 	 * Low   Low   De-emphasis 44.1 kHz ON
···
 	 */
 
 	/* Configure DEM0 GPIO (turning OFF DAC De-emphasis). */
-	ret = devm_gpio_request_one(&pdev->dev, setup->dem0_pin,
-				    GPIOF_OUT_INIT_HIGH, "codec_dem0");
-	if (ret != 0)
-		return ret;
+	pcm->dem0_pin = devm_gpiod_get(dev, "dem0", GPIOD_OUT_HIGH);
+	if (IS_ERR(pcm->dem0_pin))
+		return PTR_ERR(pcm->dem0_pin);
 
 	/* Configure DEM1 GPIO (turning OFF DAC De-emphasis). */
-	ret = devm_gpio_request_one(&pdev->dev, setup->dem1_pin,
-				    GPIOF_OUT_INIT_LOW, "codec_dem1");
-	if (ret != 0)
-		return ret;
+	pcm->dem1_pin = devm_gpiod_get(dev, "dem1", GPIOD_OUT_LOW);
+	if (IS_ERR(pcm->dem1_pin))
+		return PTR_ERR(pcm->dem1_pin);
 
 	/* Configure PDAD GPIO. */
-	ret = devm_gpio_request_one(&pdev->dev, setup->pdad_pin,
-				    GPIOF_OUT_INIT_LOW, "codec_pdad");
-	if (ret != 0)
-		return ret;
+	pcm->pdad_pin = devm_gpiod_get(dev, "pdad", GPIOD_OUT_LOW);
+	if (IS_ERR(pcm->pdad_pin))
+		return PTR_ERR(pcm->pdad_pin);
 
 	/* Configure PDDA GPIO. */
-	ret = devm_gpio_request_one(&pdev->dev, setup->pdda_pin,
-				    GPIOF_OUT_INIT_LOW, "codec_pdda");
-	if (ret != 0)
-		return ret;
+	pcm->pdda_pin = devm_gpiod_get(dev, "pdda", GPIOD_OUT_LOW);
+	if (IS_ERR(pcm->pdda_pin))
+		return PTR_ERR(pcm->pdda_pin);
 
-	return devm_snd_soc_register_component(&pdev->dev,
+	return devm_snd_soc_register_component(dev,
 			&soc_component_dev_pcm3008, &pcm3008_dai, 1);
 }
 

sound/soc/codecs/pcm3008.h

···
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * PCM3008 ALSA SoC Layer
- *
- * Author:	Hugo Villeneuve
- * Copyright (C) 2008 Lyrtech inc
- */
-
-#ifndef __LINUX_SND_SOC_PCM3008_H
-#define __LINUX_SND_SOC_PCM3008_H
-
-struct pcm3008_setup_data {
-	unsigned dem0_pin;
-	unsigned dem1_pin;
-	unsigned pdad_pin;
-	unsigned pdda_pin;
-};
-
-#endif