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/*
* gpiolib support for Palmas Series PMICS
*
* Copyright 2011 Texas Instruments
*
* Author: Graeme Gregory <gg@slimlogic.co.uk>
*
* Based on gpio-wm831x.c
*
* 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/slab.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/palmas.h>
struct palmas_gpio {
struct palmas *palmas;
struct gpio_chip gpio_chip;
};
#define GPIO_SLAVE PALMAS_BASE_TO_SLAVE(PALMAS_GPIO_BASE)
int palmas_gpio_read(struct palmas *palmas, unsigned int reg,
unsigned int *dest)
{
unsigned int addr;
addr = PALMAS_BASE_TO_REG(PALMAS_GPIO_BASE, reg);
return regmap_read(palmas->regmap[GPIO_SLAVE], addr, dest);
}
int palmas_gpio_write(struct palmas *palmas, unsigned int reg,
unsigned int value)
{
unsigned int addr;
addr = PALMAS_BASE_TO_REG(PALMAS_GPIO_BASE, reg);
return regmap_write(palmas->regmap[GPIO_SLAVE], addr, value);
}
static inline struct palmas_gpio *to_palmas_gpio(struct gpio_chip *chip)
{
return container_of(chip, struct palmas_gpio, gpio_chip);
}
static int palmas_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
{
struct palmas_gpio *palmas_gpio = to_palmas_gpio(chip);
struct palmas *palmas = palmas_gpio->palmas;
int ret;
unsigned int reg = 0;
if (!((1 << offset) & palmas->gpio_muxed))
return -EINVAL;
ret = palmas_gpio_read(palmas, PALMAS_GPIO_DATA_DIR, ®);
if (ret)
return ret;
reg &= ~(1 << offset);
return palmas_gpio_write(palmas, PALMAS_GPIO_DATA_DIR, reg);
}
static int palmas_gpio_get(struct gpio_chip *chip, unsigned offset)
{
struct palmas_gpio *palmas_gpio = to_palmas_gpio(chip);
struct palmas *palmas = palmas_gpio->palmas;
unsigned int reg = 0;
if (!((1 << offset) & palmas->gpio_muxed))
return 0;
palmas_gpio_read(palmas, PALMAS_GPIO_DATA_IN, ®);
return !!(reg & (1 << offset));
}
static void palmas_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct palmas_gpio *palmas_gpio = to_palmas_gpio(chip);
struct palmas *palmas = palmas_gpio->palmas;
unsigned int reg;
if (!((1 << offset) & palmas->gpio_muxed))
return;
palmas_gpio_read(palmas, PALMAS_GPIO_DATA_OUT, ®);
reg &= ~(1 << offset);
reg |= value << offset;
palmas_gpio_write(palmas, PALMAS_GPIO_DATA_OUT, reg);
}
static int palmas_gpio_direction_out(struct gpio_chip *chip,
unsigned offset, int value)
{
struct palmas_gpio *palmas_gpio = to_palmas_gpio(chip);
struct palmas *palmas = palmas_gpio->palmas;
int ret;
unsigned int reg;
if (!((1 << offset) & palmas->gpio_muxed))
return -EINVAL;
ret = palmas_gpio_read(palmas, PALMAS_GPIO_DATA_DIR, ®);
if (ret)
return ret;
reg |= 1 << offset;
return palmas_gpio_write(palmas, PALMAS_GPIO_DATA_DIR, reg);
}
static int palmas_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
struct palmas_gpio *palmas_gpio = to_palmas_gpio(chip);
struct palmas *palmas = palmas_gpio->palmas;
if (!regmap_irq_chip_get_base(palmas->irq_data))
return -EINVAL;
return (regmap_irq_chip_get_base(palmas->irq_data))
+ PALMAS_GPIO_0_IRQ + offset;
}
static int palmas_gpio_set_debounce(struct gpio_chip *chip, unsigned offset,
unsigned debounce)
{
struct palmas_gpio *palmas_gpio = to_palmas_gpio(chip);
struct palmas *palmas = palmas_gpio->palmas;
int ret;
unsigned int reg;
if (!((1 << offset) & palmas->gpio_muxed))
return -EINVAL;
ret = palmas_gpio_read(palmas, PALMAS_GPIO_DATA_DIR, ®);
if (ret)
return ret;
if (debounce)
reg |= 1 << offset;
else
reg &= ~(1 << offset);
return palmas_gpio_write(palmas, PALMAS_GPIO_DATA_DIR, reg);
}
static struct gpio_chip palmas_gpio_chip = {
.label = "palmas",
.owner = THIS_MODULE,
.direction_input = palmas_gpio_direction_in,
.get = palmas_gpio_get,
.direction_output = palmas_gpio_direction_out,
.set = palmas_gpio_set,
.to_irq = palmas_gpio_to_irq,
.set_debounce = palmas_gpio_set_debounce,
.can_sleep = 1,
.ngpio = 8,
};
static int __devinit palmas_gpio_probe(struct platform_device *pdev)
{
struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
struct palmas_platform_data *pdata = palmas->dev->platform_data;
struct palmas_gpio *gpio;
int ret;
gpio = kzalloc(sizeof(*gpio), GFP_KERNEL);
if (!gpio)
return -ENOMEM;
gpio->palmas = palmas;
gpio->gpio_chip = palmas_gpio_chip;
gpio->gpio_chip.dev = &pdev->dev;
if (pdata && pdata->gpio_base)
gpio->gpio_chip.base = pdata->gpio_base;
else
gpio->gpio_chip.base = -1;
ret = gpiochip_add(&gpio->gpio_chip);
if (ret < 0) {
dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
ret);
goto err;
}
platform_set_drvdata(pdev, gpio);
return ret;
err:
kfree(gpio);
return ret;
}
static int __devexit palmas_gpio_remove(struct platform_device *pdev)
{
struct palmas_gpio *gpio = platform_get_drvdata(pdev);
int ret;
ret = gpiochip_remove(&gpio->gpio_chip);
if (ret == 0)
kfree(gpio);
return ret;
}
static struct platform_driver palmas_gpio_driver = {
.driver.name = "palmas-gpio",
.driver.owner = THIS_MODULE,
.probe = palmas_gpio_probe,
.remove = __devexit_p(palmas_gpio_remove),
};
static int __init palmas_gpio_init(void)
{
return platform_driver_register(&palmas_gpio_driver);
}
subsys_initcall(palmas_gpio_init);
static void __exit palmas_gpio_exit(void)
{
platform_driver_unregister(&palmas_gpio_driver);
}
module_exit(palmas_gpio_exit);
MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
MODULE_DESCRIPTION("GPIO interface for the Palmas series chips");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:palmas-gpio");
|
