drivers/mfd/arizona-spi.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * arizona-spi.c  --  Arizona SPI bus interface
  *
  * Copyright 2012 Wolfson Microelectronics plc
  *
  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  */

 #include <linux/acpi.h>
 #include <linux/err.h>
 #include <linux/gpio/consumer.h>
 #include <linux/gpio/machine.h>
 #include <linux/module.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/spi/spi.h>
 #include <linux/of.h>
 #include <uapi/linux/input-event-codes.h>

 #include <linux/mfd/arizona/core.h>

 #include "arizona.h"

 #ifdef CONFIG_ACPI
 static const struct acpi_gpio_params reset_gpios = { 1, 0, false };
 static const struct acpi_gpio_params ldoena_gpios = { 2, 0, false };

 static const struct acpi_gpio_mapping arizona_acpi_gpios[] = {
 	{ "reset-gpios", &reset_gpios, 1, },
 	{ "wlf,ldoena-gpios", &ldoena_gpios, 1 },
 	{ }
 };

 /*
  * The ACPI resources for the device only describe external GPIO-s. They do
  * not provide mappings for the GPIO-s coming from the Arizona codec itself.
  */
 static const struct gpiod_lookup arizona_soc_gpios[] = {
 	{ "arizona", 2, "wlf,spkvdd-ena", 0, GPIO_ACTIVE_HIGH },
 	{ "arizona", 4, "wlf,micd-pol", 0, GPIO_ACTIVE_LOW },
 };

 /*
  * The AOSP 3.5 mm Headset: Accessory Specification gives the following values:
  * Function A Play/Pause:           0 ohm
  * Function D Voice assistant:    135 ohm
  * Function B Volume Up           240 ohm
  * Function C Volume Down         470 ohm
  * Minimum Mic DC resistance     1000 ohm
  * Minimum Ear speaker impedance   16 ohm
  * Note the first max value below must be less then the min. speaker impedance,
  * to allow CTIA/OMTP detection to work. The other max values are the closest
  * value from extcon-arizona.c:arizona_micd_levels halfway 2 button resistances.
  */
 static const struct arizona_micd_range arizona_micd_aosp_ranges[] = {
 	{ .max =  11, .key = KEY_PLAYPAUSE },
 	{ .max = 186, .key = KEY_VOICECOMMAND },
 	{ .max = 348, .key = KEY_VOLUMEUP },
 	{ .max = 752, .key = KEY_VOLUMEDOWN },
 };

 static void arizona_spi_acpi_remove_lookup(void *lookup)
 {
 	gpiod_remove_lookup_table(lookup);
 }

 static int arizona_spi_acpi_probe(struct arizona *arizona)
 {
 	struct gpiod_lookup_table *lookup;
 	acpi_status status;
 	int ret;

 	/* Add mappings for the 2 ACPI declared GPIOs used for reset and ldo-ena */
 	devm_acpi_dev_add_driver_gpios(arizona->dev, arizona_acpi_gpios);

 	/* Add lookups for the SoCs own GPIOs used for micdet-polarity and spkVDD-enable */
 	lookup = devm_kzalloc(arizona->dev,
 			      struct_size(lookup, table, ARRAY_SIZE(arizona_soc_gpios) + 1),
 			      GFP_KERNEL);
 	if (!lookup)
 		return -ENOMEM;

 	lookup->dev_id = dev_name(arizona->dev);
 	memcpy(lookup->table, arizona_soc_gpios, sizeof(arizona_soc_gpios));

 	gpiod_add_lookup_table(lookup);
 	ret = devm_add_action_or_reset(arizona->dev, arizona_spi_acpi_remove_lookup, lookup);
 	if (ret)
 		return ret;

 	/* Enable 32KHz clock from SoC to codec for jack-detect */
 	status = acpi_evaluate_object(ACPI_HANDLE(arizona->dev), "CLKE", NULL, NULL);
 	if (ACPI_FAILURE(status))
 		dev_warn(arizona->dev, "Failed to enable 32KHz clk ACPI error %d\n", status);

 	/*
 	 * Some DSDTs wrongly declare the IRQ trigger-type as IRQF_TRIGGER_FALLING
 	 * The IRQ line will stay low when a new IRQ event happens between reading
 	 * the IRQ status flags and acknowledging them. When the IRQ line stays
 	 * low like this the IRQ will never trigger again when its type is set
 	 * to IRQF_TRIGGER_FALLING. Correct the IRQ trigger-type to fix this.
 	 *
 	 * Note theoretically it is possible that some boards are not capable
 	 * of handling active low level interrupts. In that case setting the
 	 * flag to IRQF_TRIGGER_FALLING would not be a bug (and we would need
 	 * to work around this) but so far all known usages of IRQF_TRIGGER_FALLING
 	 * are a bug in the board's DSDT.
 	 */
 	arizona->pdata.irq_flags = IRQF_TRIGGER_LOW;

 	/* Wait 200 ms after jack insertion */
 	arizona->pdata.micd_detect_debounce = 200;

 	/* Use standard AOSP values for headset-button mappings */
 	arizona->pdata.micd_ranges = arizona_micd_aosp_ranges;
 	arizona->pdata.num_micd_ranges = ARRAY_SIZE(arizona_micd_aosp_ranges);

 	return 0;
 }

 static const struct acpi_device_id arizona_acpi_match[] = {
 	{
 		.id = "WM510204",
 		.driver_data = WM5102,
 	},
 	{
 		.id = "WM510205",
 		.driver_data = WM5102,
 	},
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, arizona_acpi_match);
 #else
 static int arizona_spi_acpi_probe(struct arizona *arizona)
 {
 	return -ENODEV;
 }
 #endif

 static int arizona_spi_probe(struct spi_device *spi)
 {
 	const struct spi_device_id *id = spi_get_device_id(spi);
 	const void *match_data;
 	struct arizona *arizona;
 	const struct regmap_config *regmap_config = NULL;
 	unsigned long type = 0;
 	int ret;

 	match_data = device_get_match_data(&spi->dev);
 	if (match_data)
 		type = (unsigned long)match_data;
 	else if (id)
 		type = id->driver_data;

 	switch (type) {
 	case WM5102:
 		if (IS_ENABLED(CONFIG_MFD_WM5102))
 			regmap_config = &wm5102_spi_regmap;
 		break;
 	case WM5110:
 	case WM8280:
 		if (IS_ENABLED(CONFIG_MFD_WM5110))
 			regmap_config = &wm5110_spi_regmap;
 		break;
 	case WM1831:
 	case CS47L24:
 		if (IS_ENABLED(CONFIG_MFD_CS47L24))
 			regmap_config = &cs47l24_spi_regmap;
 		break;
 	default:
 		dev_err(&spi->dev, "Unknown device type %ld\n", type);
 		return -EINVAL;
 	}

 	if (!regmap_config) {
 		dev_err(&spi->dev,
 			"No kernel support for device type %ld\n", type);
 		return -EINVAL;
 	}

 	arizona = devm_kzalloc(&spi->dev, sizeof(*arizona), GFP_KERNEL);
 	if (arizona == NULL)
 		return -ENOMEM;

 	arizona->regmap = devm_regmap_init_spi(spi, regmap_config);
 	if (IS_ERR(arizona->regmap)) {
 		ret = PTR_ERR(arizona->regmap);
 		dev_err(&spi->dev, "Failed to allocate register map: %d\n",
 			ret);
 		return ret;
 	}

 	arizona->type = type;
 	arizona->dev = &spi->dev;
 	arizona->irq = spi->irq;

 	if (has_acpi_companion(&spi->dev)) {
 		ret = arizona_spi_acpi_probe(arizona);
 		if (ret)
 			return ret;
 	}

 	return arizona_dev_init(arizona);
 }

 static int arizona_spi_remove(struct spi_device *spi)
 {
 	struct arizona *arizona = spi_get_drvdata(spi);

 	arizona_dev_exit(arizona);

 	return 0;
 }

 static const struct spi_device_id arizona_spi_ids[] = {
 	{ "wm5102", WM5102 },
 	{ "wm5110", WM5110 },
 	{ "wm8280", WM8280 },
 	{ "wm1831", WM1831 },
 	{ "cs47l24", CS47L24 },
 	{ },
 };
 MODULE_DEVICE_TABLE(spi, arizona_spi_ids);

 static struct spi_driver arizona_spi_driver = {
 	.driver = {
 		.name	= "arizona",
 		.pm	= &arizona_pm_ops,
 		.of_match_table	= of_match_ptr(arizona_of_match),
 		.acpi_match_table = ACPI_PTR(arizona_acpi_match),
 	},
 	.probe		= arizona_spi_probe,
 	.remove		= arizona_spi_remove,
 	.id_table	= arizona_spi_ids,
 };

 module_spi_driver(arizona_spi_driver);

 MODULE_SOFTDEP("pre: arizona_ldo1");
 MODULE_DESCRIPTION("Arizona SPI bus interface");
 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* arizona-spi.c -- Arizona SPI bus interface
	*
	* Copyright 2012 Wolfson Microelectronics plc
	*
	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	*/

	#include <linux/acpi.h>
	#include <linux/err.h>
	#include <linux/gpio/consumer.h>
	#include <linux/gpio/machine.h>
	#include <linux/module.h>
	#include <linux/pm_runtime.h>
	#include <linux/regmap.h>
	#include <linux/regulator/consumer.h>
	#include <linux/slab.h>
	#include <linux/spi/spi.h>
	#include <linux/of.h>
	#include <uapi/linux/input-event-codes.h>

	#include <linux/mfd/arizona/core.h>

	#include "arizona.h"

	#ifdef CONFIG_ACPI
	static const struct acpi_gpio_params reset_gpios = { 1, 0, false };
	static const struct acpi_gpio_params ldoena_gpios = { 2, 0, false };

	static const struct acpi_gpio_mapping arizona_acpi_gpios[] = {
	{ "reset-gpios", &reset_gpios, 1, },
	{ "wlf,ldoena-gpios", &ldoena_gpios, 1 },
	{ }
	};

	/*
	* The ACPI resources for the device only describe external GPIO-s. They do
	* not provide mappings for the GPIO-s coming from the Arizona codec itself.
	*/
	static const struct gpiod_lookup arizona_soc_gpios[] = {
	{ "arizona", 2, "wlf,spkvdd-ena", 0, GPIO_ACTIVE_HIGH },
	{ "arizona", 4, "wlf,micd-pol", 0, GPIO_ACTIVE_LOW },
	};

	/*
	* The AOSP 3.5 mm Headset: Accessory Specification gives the following values:
	* Function A Play/Pause: 0 ohm
	* Function D Voice assistant: 135 ohm
	* Function B Volume Up 240 ohm
	* Function C Volume Down 470 ohm
	* Minimum Mic DC resistance 1000 ohm
	* Minimum Ear speaker impedance 16 ohm
	* Note the first max value below must be less then the min. speaker impedance,
	* to allow CTIA/OMTP detection to work. The other max values are the closest
	* value from extcon-arizona.c:arizona_micd_levels halfway 2 button resistances.
	*/
	static const struct arizona_micd_range arizona_micd_aosp_ranges[] = {
	{ .max = 11, .key = KEY_PLAYPAUSE },
	{ .max = 186, .key = KEY_VOICECOMMAND },
	{ .max = 348, .key = KEY_VOLUMEUP },
	{ .max = 752, .key = KEY_VOLUMEDOWN },
	};

	static void arizona_spi_acpi_remove_lookup(void *lookup)
	{
	gpiod_remove_lookup_table(lookup);
	}

	static int arizona_spi_acpi_probe(struct arizona *arizona)
	{
	struct gpiod_lookup_table *lookup;
	acpi_status status;
	int ret;

	/* Add mappings for the 2 ACPI declared GPIOs used for reset and ldo-ena */
	devm_acpi_dev_add_driver_gpios(arizona->dev, arizona_acpi_gpios);

	/* Add lookups for the SoCs own GPIOs used for micdet-polarity and spkVDD-enable */
	lookup = devm_kzalloc(arizona->dev,
	struct_size(lookup, table, ARRAY_SIZE(arizona_soc_gpios) + 1),
	GFP_KERNEL);
	if (!lookup)
	return -ENOMEM;

	lookup->dev_id = dev_name(arizona->dev);
	memcpy(lookup->table, arizona_soc_gpios, sizeof(arizona_soc_gpios));

	gpiod_add_lookup_table(lookup);
	ret = devm_add_action_or_reset(arizona->dev, arizona_spi_acpi_remove_lookup, lookup);
	if (ret)
	return ret;

	/* Enable 32KHz clock from SoC to codec for jack-detect */
	status = acpi_evaluate_object(ACPI_HANDLE(arizona->dev), "CLKE", NULL, NULL);
	if (ACPI_FAILURE(status))
	dev_warn(arizona->dev, "Failed to enable 32KHz clk ACPI error %d\n", status);

	/*
	* Some DSDTs wrongly declare the IRQ trigger-type as IRQF_TRIGGER_FALLING
	* The IRQ line will stay low when a new IRQ event happens between reading
	* the IRQ status flags and acknowledging them. When the IRQ line stays
	* low like this the IRQ will never trigger again when its type is set
	* to IRQF_TRIGGER_FALLING. Correct the IRQ trigger-type to fix this.
	*
	* Note theoretically it is possible that some boards are not capable
	* of handling active low level interrupts. In that case setting the
	* flag to IRQF_TRIGGER_FALLING would not be a bug (and we would need
	* to work around this) but so far all known usages of IRQF_TRIGGER_FALLING
	* are a bug in the board's DSDT.
	*/
	arizona->pdata.irq_flags = IRQF_TRIGGER_LOW;

	/* Wait 200 ms after jack insertion */
	arizona->pdata.micd_detect_debounce = 200;

	/* Use standard AOSP values for headset-button mappings */
	arizona->pdata.micd_ranges = arizona_micd_aosp_ranges;
	arizona->pdata.num_micd_ranges = ARRAY_SIZE(arizona_micd_aosp_ranges);

	return 0;
	}

	static const struct acpi_device_id arizona_acpi_match[] = {
	{
	.id = "WM510204",
	.driver_data = WM5102,
	},
	{
	.id = "WM510205",
	.driver_data = WM5102,
	},
	{ }
	};
	MODULE_DEVICE_TABLE(acpi, arizona_acpi_match);
	#else
	static int arizona_spi_acpi_probe(struct arizona *arizona)
	{
	return -ENODEV;
	}
	#endif

	static int arizona_spi_probe(struct spi_device *spi)
	{
	const struct spi_device_id *id = spi_get_device_id(spi);
	const void *match_data;
	struct arizona *arizona;
	const struct regmap_config *regmap_config = NULL;
	unsigned long type = 0;
	int ret;

	match_data = device_get_match_data(&spi->dev);
	if (match_data)
	type = (unsigned long)match_data;
	else if (id)
	type = id->driver_data;

	switch (type) {
	case WM5102:
	if (IS_ENABLED(CONFIG_MFD_WM5102))
	regmap_config = &wm5102_spi_regmap;
	break;
	case WM5110:
	case WM8280:
	if (IS_ENABLED(CONFIG_MFD_WM5110))
	regmap_config = &wm5110_spi_regmap;
	break;
	case WM1831:
	case CS47L24:
	if (IS_ENABLED(CONFIG_MFD_CS47L24))
	regmap_config = &cs47l24_spi_regmap;
	break;
	default:
	dev_err(&spi->dev, "Unknown device type %ld\n", type);
	return -EINVAL;
	}

	if (!regmap_config) {
	dev_err(&spi->dev,
	"No kernel support for device type %ld\n", type);
	return -EINVAL;
	}

	arizona = devm_kzalloc(&spi->dev, sizeof(*arizona), GFP_KERNEL);
	if (arizona == NULL)
	return -ENOMEM;

	arizona->regmap = devm_regmap_init_spi(spi, regmap_config);
	if (IS_ERR(arizona->regmap)) {
	ret = PTR_ERR(arizona->regmap);
	dev_err(&spi->dev, "Failed to allocate register map: %d\n",
	ret);
	return ret;
	}

	arizona->type = type;
	arizona->dev = &spi->dev;
	arizona->irq = spi->irq;

	if (has_acpi_companion(&spi->dev)) {
	ret = arizona_spi_acpi_probe(arizona);
	if (ret)
	return ret;
	}

	return arizona_dev_init(arizona);
	}

	static int arizona_spi_remove(struct spi_device *spi)
	{
	struct arizona *arizona = spi_get_drvdata(spi);

	arizona_dev_exit(arizona);

	return 0;
	}

	static const struct spi_device_id arizona_spi_ids[] = {
	{ "wm5102", WM5102 },
	{ "wm5110", WM5110 },
	{ "wm8280", WM8280 },
	{ "wm1831", WM1831 },
	{ "cs47l24", CS47L24 },
	{ },
	};
	MODULE_DEVICE_TABLE(spi, arizona_spi_ids);

	static struct spi_driver arizona_spi_driver = {
	.driver = {
	.name = "arizona",
	.pm = &arizona_pm_ops,
	.of_match_table = of_match_ptr(arizona_of_match),
	.acpi_match_table = ACPI_PTR(arizona_acpi_match),
	},
	.probe = arizona_spi_probe,
	.remove = arizona_spi_remove,
	.id_table = arizona_spi_ids,
	};

	module_spi_driver(arizona_spi_driver);

	MODULE_SOFTDEP("pre: arizona_ldo1");
	MODULE_DESCRIPTION("Arizona SPI bus interface");
	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	MODULE_LICENSE("GPL");