gpiolib: Add support for WM8350 GPIO controller (38f6ce45) · Commits · github.com / kvm-riscv / linux

drivers/gpio/Kconfig

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		@@ -185,6 +185,13 @@ config GPIO_WM831X
		Say yes here to access the GPIO signals of WM831x power management
		chips from Wolfson Microelectronics.

		config GPIO_WM8350
		tristate "WM8350 GPIOs"
		depends on MFD_WM8350
		help
		Say yes here to access the GPIO signals of WM8350 power management
		chips from Wolfson Microelectronics.

		config GPIO_ADP5520
		tristate "GPIO Support for ADP5520 PMIC"
		depends on PMIC_ADP5520

drivers/gpio/Makefile

+1 −0

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		@@ -25,3 +25,4 @@ obj-$(CONFIG_GPIO_BT8XX) += bt8xxgpio.o
		obj-$(CONFIG_GPIO_IT8761E) += it8761e_gpio.o
		obj-$(CONFIG_GPIO_VR41XX) += vr41xx_giu.o
		obj-$(CONFIG_GPIO_WM831X) += wm831x-gpio.o
		obj-$(CONFIG_GPIO_WM8350) += wm8350-gpiolib.o

drivers/gpio/wm8350-gpiolib.c

0 → 100644

+181 −0

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		/*
		* wm835x-gpiolib.c -- gpiolib support for Wolfson WM835x PMICs
		*
		* Copyright 2009 Wolfson Microelectronics PLC.
		*
		* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
		*
		* This program is free software; you can redistribute it and/or modify it
		* under the terms of the GNU General Public License as published by the
		* Free Software Foundation; either version 2 of the License, or (at your
		* option) any later version.
		*
		*/

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/gpio.h>
		#include <linux/mfd/core.h>
		#include <linux/platform_device.h>
		#include <linux/seq_file.h>

		#include <linux/mfd/wm8350/core.h>
		#include <linux/mfd/wm8350/gpio.h>

		struct wm8350_gpio_data {
		struct wm8350 *wm8350;
		struct gpio_chip gpio_chip;
		};

		static inline struct wm8350_gpio_data to_wm8350_gpio(struct gpio_chip chip)
		{
		return container_of(chip, struct wm8350_gpio_data, gpio_chip);
		}

		static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
		{
		struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
		struct wm8350 *wm8350 = wm8350_gpio->wm8350;

		return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
		1 << offset);
		}

		static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
		{
		struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
		struct wm8350 *wm8350 = wm8350_gpio->wm8350;
		int ret;

		ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL);
		if (ret < 0)
		return ret;

		if (ret & (1 << offset))
		return 1;
		else
		return 0;
		}

		static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
		{
		struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
		struct wm8350 *wm8350 = wm8350_gpio->wm8350;

		if (value)
		wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
		else
		wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
		}

		static int wm8350_gpio_direction_out(struct gpio_chip *chip,
		unsigned offset, int value)
		{
		struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
		struct wm8350 *wm8350 = wm8350_gpio->wm8350;
		int ret;

		ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
		1 << offset);
		if (ret < 0)
		return ret;

		/* Don't have an atomic direction/value setup */
		wm8350_gpio_set(chip, offset, value);

		return 0;
		}

		static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
		{
		struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
		struct wm8350 *wm8350 = wm8350_gpio->wm8350;

		if (!wm8350->irq_base)
		return -EINVAL;

		return wm8350->irq_base + WM8350_IRQ_GPIO(offset);
		}

		static struct gpio_chip template_chip = {
		.label = "wm8350",
		.owner = THIS_MODULE,
		.direction_input = wm8350_gpio_direction_in,
		.get = wm8350_gpio_get,
		.direction_output = wm8350_gpio_direction_out,
		.set = wm8350_gpio_set,
		.to_irq = wm8350_gpio_to_irq,
		.can_sleep = 1,
		};

		static int __devinit wm8350_gpio_probe(struct platform_device *pdev)
		{
		struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent);
		struct wm8350_platform_data *pdata = wm8350->dev->platform_data;
		struct wm8350_gpio_data *wm8350_gpio;
		int ret;

		wm8350_gpio = kzalloc(sizeof(*wm8350_gpio), GFP_KERNEL);
		if (wm8350_gpio == NULL)
		return -ENOMEM;

		wm8350_gpio->wm8350 = wm8350;
		wm8350_gpio->gpio_chip = template_chip;
		wm8350_gpio->gpio_chip.ngpio = 13;
		wm8350_gpio->gpio_chip.dev = &pdev->dev;
		if (pdata && pdata->gpio_base)
		wm8350_gpio->gpio_chip.base = pdata->gpio_base;
		else
		wm8350_gpio->gpio_chip.base = -1;

		ret = gpiochip_add(&wm8350_gpio->gpio_chip);
		if (ret < 0) {
		dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
		ret);
		goto err;
		}

		platform_set_drvdata(pdev, wm8350_gpio);

		return ret;

		err:
		kfree(wm8350_gpio);
		return ret;
		}

		static int __devexit wm8350_gpio_remove(struct platform_device *pdev)
		{
		struct wm8350_gpio_data *wm8350_gpio = platform_get_drvdata(pdev);
		int ret;

		ret = gpiochip_remove(&wm8350_gpio->gpio_chip);
		if (ret == 0)
		kfree(wm8350_gpio);

		return ret;
		}

		static struct platform_driver wm8350_gpio_driver = {
		.driver.name = "wm8350-gpio",
		.driver.owner = THIS_MODULE,
		.probe = wm8350_gpio_probe,
		.remove = __devexit_p(wm8350_gpio_remove),
		};

		static int __init wm8350_gpio_init(void)
		{
		return platform_driver_register(&wm8350_gpio_driver);
		}
		subsys_initcall(wm8350_gpio_init);

		static void __exit wm8350_gpio_exit(void)
		{
		platform_driver_unregister(&wm8350_gpio_driver);
		}
		module_exit(wm8350_gpio_exit);

		MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
		MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:wm8350-gpio");

include/linux/mfd/wm8350/core.h

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		@@ -645,11 +645,13 @@ struct wm8350 {
		* used by the platform to configure GPIO functions and similar.
		* @irq_high: Set if WM8350 IRQ is active high.
		* @irq_base: Base IRQ for genirq (not currently used).
		* @gpio_base: Base for gpiolib.
		*/
		struct wm8350_platform_data {
		int (init)(struct wm8350 wm8350);
		int irq_high;
		int irq_base;
		int gpio_base;
		};

include/linux/mfd/wm8350/gpio.h

+1 −0

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		@@ -29,6 +29,7 @@
		#define WM8350_GPIO_FUNCTION_SELECT_2 0x8D
		#define WM8350_GPIO_FUNCTION_SELECT_3 0x8E
		#define WM8350_GPIO_FUNCTION_SELECT_4 0x8F
		#define WM8350_GPIO_LEVEL 0xE6

		/*
		* GPIO Functions