gpio: wcd934x: Add support to wcd934x gpio controller (59c32468) · Commits · 戴 / test

drivers/gpio/Kconfig

+7 −0

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		@@ -619,6 +619,13 @@ config GPIO_VX855
		additional drivers must be enabled in order to use the
		functionality of the device.

		config GPIO_WCD934X
		tristate "Qualcomm Technologies Inc WCD9340/WCD9341 gpio controller driver"
		depends on MFD_WCD934X && OF_GPIO
		help
		This driver is to supprot GPIO block found on the Qualcomm Technologies
		Inc WCD9340/WCD9341 Audio Codec.

		config GPIO_XGENE
		bool "APM X-Gene GPIO controller support"
		depends on ARM64 && OF_GPIO

drivers/gpio/Makefile

+1 −0

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		@@ -158,6 +158,7 @@ obj-$(CONFIG_GPIO_VF610) += gpio-vf610.o
		obj-$(CONFIG_GPIO_VIPERBOARD) += gpio-viperboard.o
		obj-$(CONFIG_GPIO_VR41XX) += gpio-vr41xx.o
		obj-$(CONFIG_GPIO_VX855) += gpio-vx855.o
		obj-$(CONFIG_GPIO_WCD934X) += gpio-wcd934x.o
		obj-$(CONFIG_GPIO_WHISKEY_COVE) += gpio-wcove.o
		obj-$(CONFIG_GPIO_WINBOND) += gpio-winbond.o
		obj-$(CONFIG_GPIO_WM831X) += gpio-wm831x.o

drivers/gpio/gpio-wcd934x.c

0 → 100644

+121 −0

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		// SPDX-License-Identifier: GPL-2.0
		// Copyright (c) 2019, Linaro Limited

		#include <linux/module.h>
		#include <linux/gpio/driver.h>
		#include <linux/regmap.h>
		#include <linux/slab.h>
		#include <linux/of_device.h>

		#define WCD_PIN_MASK(p) BIT(p - 1)
		#define WCD_REG_DIR_CTL_OFFSET 0x42
		#define WCD_REG_VAL_CTL_OFFSET 0x43
		#define WCD934X_NPINS 5

		struct wcd_gpio_data {
		struct regmap *map;
		struct gpio_chip chip;
		};

		static int wcd_gpio_get_direction(struct gpio_chip *chip, unsigned int pin)
		{
		struct wcd_gpio_data *data = gpiochip_get_data(chip);
		unsigned int value;
		int ret;

		ret = regmap_read(data->map, WCD_REG_DIR_CTL_OFFSET, &value);
		if (ret < 0)
		return ret;

		if (value & WCD_PIN_MASK(pin))
		return GPIO_LINE_DIRECTION_OUT;

		return GPIO_LINE_DIRECTION_IN;
		}

		static int wcd_gpio_direction_input(struct gpio_chip *chip, unsigned int pin)
		{
		struct wcd_gpio_data *data = gpiochip_get_data(chip);

		return regmap_update_bits(data->map, WCD_REG_DIR_CTL_OFFSET,
		WCD_PIN_MASK(pin), 0);
		}

		static int wcd_gpio_direction_output(struct gpio_chip *chip, unsigned int pin,
		int val)
		{
		struct wcd_gpio_data *data = gpiochip_get_data(chip);

		regmap_update_bits(data->map, WCD_REG_DIR_CTL_OFFSET,
		WCD_PIN_MASK(pin), WCD_PIN_MASK(pin));

		return regmap_update_bits(data->map, WCD_REG_VAL_CTL_OFFSET,
		WCD_PIN_MASK(pin),
		val ? WCD_PIN_MASK(pin) : 0);
		}

		static int wcd_gpio_get(struct gpio_chip *chip, unsigned int pin)
		{
		struct wcd_gpio_data *data = gpiochip_get_data(chip);
		int value;

		regmap_read(data->map, WCD_REG_VAL_CTL_OFFSET, &value);

		return !!(value && WCD_PIN_MASK(pin));
		}

		static void wcd_gpio_set(struct gpio_chip *chip, unsigned int pin, int val)
		{
		wcd_gpio_direction_output(chip, pin, val);
		}

		static int wcd_gpio_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct wcd_gpio_data *data;
		struct gpio_chip *chip;

		data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
		if (!data)
		return -ENOMEM;

		data->map = dev_get_regmap(dev->parent, NULL);
		if (!data->map) {
		dev_err(dev, "%s: failed to get regmap\n", __func__);
		return -EINVAL;
		}

		chip = &data->chip;
		chip->direction_input = wcd_gpio_direction_input;
		chip->direction_output = wcd_gpio_direction_output;
		chip->get_direction = wcd_gpio_get_direction;
		chip->get = wcd_gpio_get;
		chip->set = wcd_gpio_set;
		chip->parent = dev;
		chip->base = -1;
		chip->ngpio = WCD934X_NPINS;
		chip->label = dev_name(dev);
		chip->of_gpio_n_cells = 2;
		chip->can_sleep = false;

		return devm_gpiochip_add_data(dev, chip, data);
		}

		static const struct of_device_id wcd_gpio_of_match[] = {
		{ .compatible = "qcom,wcd9340-gpio" },
		{ .compatible = "qcom,wcd9341-gpio" },
		{ }
		};
		MODULE_DEVICE_TABLE(of, wcd_gpio_of_match);

		static struct platform_driver wcd_gpio_driver = {
		.driver = {
		.name = "wcd934x-gpio",
		.of_match_table = wcd_gpio_of_match,
		},
		.probe = wcd_gpio_probe,
		};

		module_platform_driver(wcd_gpio_driver);
		MODULE_DESCRIPTION("Qualcomm Technologies, Inc WCD GPIO control driver");
		MODULE_LICENSE("GPL v2");

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