mirror of
https://github.com/edk2-porting/linux-next.git
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e56aee1897
Use the wrapper function for retrieving the platform data instead of accessing dev->platform_data directly. Signed-off-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
205 lines
4.8 KiB
C
205 lines
4.8 KiB
C
/*
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* GPIO Driver for Dialog DA9055 PMICs.
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*
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* Copyright(c) 2012 Dialog Semiconductor Ltd.
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*
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* Author: David Dajun Chen <dchen@diasemi.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/module.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/mfd/da9055/core.h>
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#include <linux/mfd/da9055/reg.h>
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#include <linux/mfd/da9055/pdata.h>
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#define DA9055_VDD_IO 0x0
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#define DA9055_PUSH_PULL 0x3
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#define DA9055_ACT_LOW 0x0
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#define DA9055_GPI 0x1
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#define DA9055_PORT_MASK 0x3
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#define DA9055_PORT_SHIFT(offset) (4 * (offset % 2))
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#define DA9055_INPUT DA9055_GPI
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#define DA9055_OUTPUT DA9055_PUSH_PULL
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#define DA9055_IRQ_GPI0 3
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struct da9055_gpio {
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struct da9055 *da9055;
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struct gpio_chip gp;
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};
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static inline struct da9055_gpio *to_da9055_gpio(struct gpio_chip *chip)
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{
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return container_of(chip, struct da9055_gpio, gp);
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}
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static int da9055_gpio_get(struct gpio_chip *gc, unsigned offset)
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{
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struct da9055_gpio *gpio = to_da9055_gpio(gc);
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int gpio_direction = 0;
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int ret;
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/* Get GPIO direction */
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ret = da9055_reg_read(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1);
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if (ret < 0)
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return ret;
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gpio_direction = ret & (DA9055_PORT_MASK) << DA9055_PORT_SHIFT(offset);
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gpio_direction >>= DA9055_PORT_SHIFT(offset);
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switch (gpio_direction) {
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case DA9055_INPUT:
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ret = da9055_reg_read(gpio->da9055, DA9055_REG_STATUS_B);
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if (ret < 0)
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return ret;
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break;
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case DA9055_OUTPUT:
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ret = da9055_reg_read(gpio->da9055, DA9055_REG_GPIO_MODE0_2);
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if (ret < 0)
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return ret;
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}
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return ret & (1 << offset);
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}
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static void da9055_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
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{
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struct da9055_gpio *gpio = to_da9055_gpio(gc);
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da9055_reg_update(gpio->da9055,
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DA9055_REG_GPIO_MODE0_2,
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1 << offset,
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value << offset);
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}
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static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
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{
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struct da9055_gpio *gpio = to_da9055_gpio(gc);
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unsigned char reg_byte;
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reg_byte = (DA9055_ACT_LOW | DA9055_GPI)
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<< DA9055_PORT_SHIFT(offset);
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return da9055_reg_update(gpio->da9055, (offset >> 1) +
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DA9055_REG_GPIO0_1,
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DA9055_PORT_MASK <<
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DA9055_PORT_SHIFT(offset),
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reg_byte);
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}
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static int da9055_gpio_direction_output(struct gpio_chip *gc,
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unsigned offset, int value)
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{
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struct da9055_gpio *gpio = to_da9055_gpio(gc);
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unsigned char reg_byte;
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int ret;
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reg_byte = (DA9055_VDD_IO | DA9055_PUSH_PULL)
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<< DA9055_PORT_SHIFT(offset);
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ret = da9055_reg_update(gpio->da9055, (offset >> 1) +
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DA9055_REG_GPIO0_1,
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DA9055_PORT_MASK <<
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DA9055_PORT_SHIFT(offset),
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reg_byte);
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if (ret < 0)
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return ret;
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da9055_gpio_set(gc, offset, value);
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return 0;
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}
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static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset)
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{
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struct da9055_gpio *gpio = to_da9055_gpio(gc);
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struct da9055 *da9055 = gpio->da9055;
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return regmap_irq_get_virq(da9055->irq_data,
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DA9055_IRQ_GPI0 + offset);
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}
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static struct gpio_chip reference_gp = {
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.label = "da9055-gpio",
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.owner = THIS_MODULE,
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.get = da9055_gpio_get,
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.set = da9055_gpio_set,
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.direction_input = da9055_gpio_direction_input,
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.direction_output = da9055_gpio_direction_output,
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.to_irq = da9055_gpio_to_irq,
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.can_sleep = 1,
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.ngpio = 3,
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.base = -1,
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};
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static int da9055_gpio_probe(struct platform_device *pdev)
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{
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struct da9055_gpio *gpio;
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struct da9055_pdata *pdata;
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int ret;
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gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
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if (gpio == NULL)
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return -ENOMEM;
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gpio->da9055 = dev_get_drvdata(pdev->dev.parent);
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pdata = dev_get_platdata(gpio->da9055->dev);
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gpio->gp = reference_gp;
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if (pdata && pdata->gpio_base)
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gpio->gp.base = pdata->gpio_base;
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ret = gpiochip_add(&gpio->gp);
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if (ret < 0) {
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dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
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goto err_mem;
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}
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platform_set_drvdata(pdev, gpio);
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return 0;
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err_mem:
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return ret;
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}
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static int da9055_gpio_remove(struct platform_device *pdev)
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{
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struct da9055_gpio *gpio = platform_get_drvdata(pdev);
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return gpiochip_remove(&gpio->gp);
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}
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static struct platform_driver da9055_gpio_driver = {
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.probe = da9055_gpio_probe,
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.remove = da9055_gpio_remove,
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.driver = {
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.name = "da9055-gpio",
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.owner = THIS_MODULE,
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},
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};
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static int __init da9055_gpio_init(void)
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{
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return platform_driver_register(&da9055_gpio_driver);
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}
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subsys_initcall(da9055_gpio_init);
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static void __exit da9055_gpio_exit(void)
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{
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platform_driver_unregister(&da9055_gpio_driver);
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}
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module_exit(da9055_gpio_exit);
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MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
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MODULE_DESCRIPTION("DA9055 GPIO Device Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:da9055-gpio");
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