gpiolib: Add support for WM8350 GPIO controller
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mark Brown
Samuel Ortiz
parent
59f25070df
commit
38f6ce45f0
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@ -185,6 +185,13 @@ config GPIO_WM831X
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Say yes here to access the GPIO signals of WM831x power management
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chips from Wolfson Microelectronics.
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config GPIO_WM8350
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tristate "WM8350 GPIOs"
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depends on MFD_WM8350
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help
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Say yes here to access the GPIO signals of WM8350 power management
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chips from Wolfson Microelectronics.
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config GPIO_ADP5520
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tristate "GPIO Support for ADP5520 PMIC"
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depends on PMIC_ADP5520
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@ -25,3 +25,4 @@ obj-$(CONFIG_GPIO_BT8XX) += bt8xxgpio.o
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obj-$(CONFIG_GPIO_IT8761E) += it8761e_gpio.o
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obj-$(CONFIG_GPIO_VR41XX) += vr41xx_giu.o
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obj-$(CONFIG_GPIO_WM831X) += wm831x-gpio.o
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obj-$(CONFIG_GPIO_WM8350) += wm8350-gpiolib.o
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@ -0,0 +1,181 @@
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/*
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* wm835x-gpiolib.c -- gpiolib support for Wolfson WM835x PMICs
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*
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* Copyright 2009 Wolfson Microelectronics PLC.
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*
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/mfd/core.h>
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#include <linux/platform_device.h>
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#include <linux/seq_file.h>
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#include <linux/mfd/wm8350/core.h>
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#include <linux/mfd/wm8350/gpio.h>
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struct wm8350_gpio_data {
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struct wm8350 *wm8350;
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struct gpio_chip gpio_chip;
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};
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static inline struct wm8350_gpio_data *to_wm8350_gpio(struct gpio_chip *chip)
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{
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return container_of(chip, struct wm8350_gpio_data, gpio_chip);
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}
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static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
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{
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struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
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struct wm8350 *wm8350 = wm8350_gpio->wm8350;
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return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
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1 << offset);
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}
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static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
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struct wm8350 *wm8350 = wm8350_gpio->wm8350;
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int ret;
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ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL);
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if (ret < 0)
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return ret;
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if (ret & (1 << offset))
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return 1;
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else
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return 0;
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}
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static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
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struct wm8350 *wm8350 = wm8350_gpio->wm8350;
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if (value)
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wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
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else
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wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset);
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}
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static int wm8350_gpio_direction_out(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
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struct wm8350 *wm8350 = wm8350_gpio->wm8350;
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int ret;
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ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O,
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1 << offset);
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if (ret < 0)
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return ret;
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/* Don't have an atomic direction/value setup */
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wm8350_gpio_set(chip, offset, value);
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return 0;
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}
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static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
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{
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struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip);
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struct wm8350 *wm8350 = wm8350_gpio->wm8350;
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if (!wm8350->irq_base)
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return -EINVAL;
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return wm8350->irq_base + WM8350_IRQ_GPIO(offset);
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}
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static struct gpio_chip template_chip = {
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.label = "wm8350",
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.owner = THIS_MODULE,
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.direction_input = wm8350_gpio_direction_in,
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.get = wm8350_gpio_get,
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.direction_output = wm8350_gpio_direction_out,
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.set = wm8350_gpio_set,
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.to_irq = wm8350_gpio_to_irq,
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.can_sleep = 1,
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};
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static int __devinit wm8350_gpio_probe(struct platform_device *pdev)
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{
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struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent);
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struct wm8350_platform_data *pdata = wm8350->dev->platform_data;
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struct wm8350_gpio_data *wm8350_gpio;
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int ret;
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wm8350_gpio = kzalloc(sizeof(*wm8350_gpio), GFP_KERNEL);
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if (wm8350_gpio == NULL)
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return -ENOMEM;
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wm8350_gpio->wm8350 = wm8350;
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wm8350_gpio->gpio_chip = template_chip;
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wm8350_gpio->gpio_chip.ngpio = 13;
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wm8350_gpio->gpio_chip.dev = &pdev->dev;
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if (pdata && pdata->gpio_base)
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wm8350_gpio->gpio_chip.base = pdata->gpio_base;
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else
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wm8350_gpio->gpio_chip.base = -1;
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ret = gpiochip_add(&wm8350_gpio->gpio_chip);
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if (ret < 0) {
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dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
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ret);
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goto err;
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}
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platform_set_drvdata(pdev, wm8350_gpio);
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return ret;
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err:
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kfree(wm8350_gpio);
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return ret;
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}
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static int __devexit wm8350_gpio_remove(struct platform_device *pdev)
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{
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struct wm8350_gpio_data *wm8350_gpio = platform_get_drvdata(pdev);
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int ret;
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ret = gpiochip_remove(&wm8350_gpio->gpio_chip);
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if (ret == 0)
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kfree(wm8350_gpio);
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return ret;
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}
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static struct platform_driver wm8350_gpio_driver = {
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.driver.name = "wm8350-gpio",
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.driver.owner = THIS_MODULE,
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.probe = wm8350_gpio_probe,
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.remove = __devexit_p(wm8350_gpio_remove),
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};
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static int __init wm8350_gpio_init(void)
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{
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return platform_driver_register(&wm8350_gpio_driver);
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}
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subsys_initcall(wm8350_gpio_init);
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static void __exit wm8350_gpio_exit(void)
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{
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platform_driver_unregister(&wm8350_gpio_driver);
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}
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module_exit(wm8350_gpio_exit);
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:wm8350-gpio");
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@ -645,11 +645,13 @@ struct wm8350 {
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* used by the platform to configure GPIO functions and similar.
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* @irq_high: Set if WM8350 IRQ is active high.
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* @irq_base: Base IRQ for genirq (not currently used).
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* @gpio_base: Base for gpiolib.
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*/
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struct wm8350_platform_data {
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int (*init)(struct wm8350 *wm8350);
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int irq_high;
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int irq_base;
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int gpio_base;
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};
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@ -29,6 +29,7 @@
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#define WM8350_GPIO_FUNCTION_SELECT_2 0x8D
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#define WM8350_GPIO_FUNCTION_SELECT_3 0x8E
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#define WM8350_GPIO_FUNCTION_SELECT_4 0x8F
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#define WM8350_GPIO_LEVEL 0xE6
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/*
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* GPIO Functions
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