gpio: lp87565: Add support for GPIO (5c7f2c76) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/gpio/Kconfig

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		@@ -954,6 +954,16 @@ config GPIO_LP873X
		This driver can also be built as a module. If so, the module will be
		called gpio-lp873x.

		config GPIO_LP87565
		tristate "TI LP87565 GPIO"
		depends on MFD_TI_LP87565
		help
		This driver supports the GPIO on TI Lp873565 PMICs. 3 GPIOs are present
		on LP87565 PMICs.

		This driver can also be built as a module. If so, the module will be
		called gpio-lp87565.

		config GPIO_MAX77620
		tristate "GPIO support for PMIC MAX77620 and MAX20024"
		depends on MFD_MAX77620

drivers/gpio/Makefile

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		@@ -66,6 +66,7 @@ obj-$(CONFIG_GPIO_LP3943) += gpio-lp3943.o
		obj-$(CONFIG_GPIO_LPC18XX) += gpio-lpc18xx.o
		obj-$(CONFIG_ARCH_LPC32XX) += gpio-lpc32xx.o
		obj-$(CONFIG_GPIO_LP873X) += gpio-lp873x.o
		obj-$(CONFIG_GPIO_LP87565) += gpio-lp87565.o
		obj-$(CONFIG_GPIO_LYNXPOINT) += gpio-lynxpoint.o
		obj-$(CONFIG_GPIO_MAX730X) += gpio-max730x.o
		obj-$(CONFIG_GPIO_MAX7300) += gpio-max7300.o

drivers/gpio/gpio-lp87565.c

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		/*
		* Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
		* Keerthy <j-keerthy@ti.com>
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		* This program is distributed "as is" WITHOUT ANY WARRANTY of any
		* kind, whether expressed or implied; without even the implied warranty
		* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License version 2 for more details.
		*
		* Based on the LP873X driver
		*/

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

		#include <linux/mfd/lp87565.h>

		struct lp87565_gpio {
		struct gpio_chip chip;
		struct regmap *map;
		};

		static int lp87565_gpio_get_direction(struct gpio_chip *chip,
		unsigned int offset)
		{
		struct lp87565_gpio *gpio = gpiochip_get_data(chip);
		int ret, val;

		ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
		if (ret < 0)
		return ret;

		return !(val & BIT(offset));
		}

		static int lp87565_gpio_direction_input(struct gpio_chip *chip,
		unsigned int offset)
		{
		struct lp87565_gpio *gpio = gpiochip_get_data(chip);

		return regmap_update_bits(gpio->map,
		LP87565_REG_GPIO_CONFIG,
		BIT(offset), 0);
		}

		static int lp87565_gpio_direction_output(struct gpio_chip *chip,
		unsigned int offset, int value)
		{
		struct lp87565_gpio *gpio = gpiochip_get_data(chip);

		return regmap_update_bits(gpio->map,
		LP87565_REG_GPIO_CONFIG,
		BIT(offset), !value ? BIT(offset) : 0);
		}

		static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
		{
		struct lp87565_gpio *gpio = gpiochip_get_data(chip);
		int ret, val;

		ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
		if (ret < 0)
		return ret;

		return !!(val & BIT(offset));
		}

		static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
		int value)
		{
		struct lp87565_gpio *gpio = gpiochip_get_data(chip);

		regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
		BIT(offset), value ? BIT(offset) : 0);
		}

		static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
		{
		struct lp87565_gpio *gpio = gpiochip_get_data(gc);
		int ret;

		switch (offset) {
		case 0:
		case 1:
		case 2:
		/*
		* MUX can program the pin to be in EN1/2/3 pin mode
		* Or GPIO1/2/3 mode.
		* Setup the GPIO*_SEL MUX to GPIO mode
		*/
		ret = regmap_update_bits(gpio->map,
		LP87565_REG_PIN_FUNCTION,
		BIT(offset), BIT(offset));
		if (ret)
		return ret;

		break;
		default:
		return -EINVAL;
		}

		return 0;
		}

		static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
		unsigned long config)
		{
		struct lp87565_gpio *gpio = gpiochip_get_data(gc);

		switch (pinconf_to_config_param(config)) {
		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
		return regmap_update_bits(gpio->map,
		LP87565_REG_GPIO_CONFIG,
		BIT(offset +
		__ffs(LP87565_GOIO1_OD)),
		BIT(offset +
		__ffs(LP87565_GOIO1_OD)));
		case PIN_CONFIG_DRIVE_PUSH_PULL:
		return regmap_update_bits(gpio->map,
		LP87565_REG_GPIO_CONFIG,
		BIT(offset +
		__ffs(LP87565_GOIO1_OD)), 0);
		default:
		return -ENOTSUPP;
		}
		}

		static const struct gpio_chip template_chip = {
		.label = "lp87565-gpio",
		.owner = THIS_MODULE,
		.request = lp87565_gpio_request,
		.get_direction = lp87565_gpio_get_direction,
		.direction_input = lp87565_gpio_direction_input,
		.direction_output = lp87565_gpio_direction_output,
		.get = lp87565_gpio_get,
		.set = lp87565_gpio_set,
		.set_config = lp87565_gpio_set_config,
		.base = -1,
		.ngpio = 3,
		.can_sleep = true,
		};

		static int lp87565_gpio_probe(struct platform_device *pdev)
		{
		struct lp87565_gpio *gpio;
		struct lp87565 *lp87565;
		int ret;

		gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
		if (!gpio)
		return -ENOMEM;

		lp87565 = dev_get_drvdata(pdev->dev.parent);
		gpio->chip = template_chip;
		gpio->chip.parent = lp87565->dev;
		gpio->map = lp87565->regmap;

		ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
		if (ret < 0) {
		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
		return ret;
		}

		return 0;
		}

		static const struct platform_device_id lp87565_gpio_id_table[] = {
		{ "lp87565-q1-gpio", },
		{ /* sentinel */ }
		};
		MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);

		static struct platform_driver lp87565_gpio_driver = {
		.driver = {
		.name = "lp87565-gpio",
		},
		.probe = lp87565_gpio_probe,
		.id_table = lp87565_gpio_id_table,
		};
		module_platform_driver(lp87565_gpio_driver);

		MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
		MODULE_DESCRIPTION("LP87565 GPIO driver");
		MODULE_LICENSE("GPL v2");