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/* NXP PCF50633 GPIO Driver
*
* (C) 2006-2008 by Openmoko, Inc.
* Author: Balaji Rao <balajirrao@openmoko.org>
* Copyright 2010, Lars-Peter Clausen <lars@metafoo.de>
* All rights reserved.
*
* Broken down from monstrous PCF50633 driver mainly by
* Harald Welte, Andy Green and Werner Almesberger
*
* 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/platform_device.h>
#include <linux/mfd/pcf50633/core.h>
#include <linux/mfd/pcf50633/gpio.h>
#include <linux/gpio.h>
#define PCF50633_REG_GPIOCTL 0x13
#define PCF50633_REG_GPIOCFG(x) (0x14 + (x))
enum pcf50633_regulator_id {
PCF50633_REGULATOR_AUTO,
PCF50633_REGULATOR_DOWN1,
PCF50633_REGULATOR_DOWN2,
PCF50633_REGULATOR_LDO1,
PCF50633_REGULATOR_LDO2,
PCF50633_REGULATOR_LDO3,
PCF50633_REGULATOR_LDO4,
PCF50633_REGULATOR_LDO5,
PCF50633_REGULATOR_LDO6,
PCF50633_REGULATOR_HCLDO,
PCF50633_REGULATOR_MEMLDO,
};
#define PCF50633_REG_AUTOOUT 0x1a
#define PCF50633_REG_DOWN1OUT 0x1e
#define PCF50633_REG_DOWN2OUT 0x22
#define PCF50633_REG_MEMLDOOUT 0x26
#define PCF50633_REG_LDO1OUT 0x2d
#define PCF50633_REG_LDO2OUT 0x2f
#define PCF50633_REG_LDO3OUT 0x31
#define PCF50633_REG_LDO4OUT 0x33
#define PCF50633_REG_LDO5OUT 0x35
#define PCF50633_REG_LDO6OUT 0x37
#define PCF50633_REG_HCLDOOUT 0x39
static const u8 pcf50633_regulator_registers[PCF50633_NUM_REGULATORS] = {
[PCF50633_REGULATOR_AUTO] = PCF50633_REG_AUTOOUT,
[PCF50633_REGULATOR_DOWN1] = PCF50633_REG_DOWN1OUT,
[PCF50633_REGULATOR_DOWN2] = PCF50633_REG_DOWN2OUT,
[PCF50633_REGULATOR_MEMLDO] = PCF50633_REG_MEMLDOOUT,
[PCF50633_REGULATOR_LDO1] = PCF50633_REG_LDO1OUT,
[PCF50633_REGULATOR_LDO2] = PCF50633_REG_LDO2OUT,
[PCF50633_REGULATOR_LDO3] = PCF50633_REG_LDO3OUT,
[PCF50633_REGULATOR_LDO4] = PCF50633_REG_LDO4OUT,
[PCF50633_REGULATOR_LDO5] = PCF50633_REG_LDO5OUT,
[PCF50633_REGULATOR_LDO6] = PCF50633_REG_LDO6OUT,
[PCF50633_REGULATOR_HCLDO] = PCF50633_REG_HCLDOOUT,
};
struct pcf50633_gpio {
struct pcf50633 *pcf;
struct gpio_chip chip;
};
static inline struct pcf50633 *gpio_chip_to_pcf50633(struct gpio_chip *chip)
{
struct pcf50633 *pcf = dev_to_pcf50633(chip->dev->parent);
return pcf;
}
static void pcf50633_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
{
struct pcf50633 *pcf = gpio_chip_to_pcf50633(chip);
u8 reg;
reg = PCF50633_REG_GPIOCFG(gpio);
pcf50633_reg_set_bit_mask(pcf, reg, 0x07, value ? 0x0 : 0x7);
}
static int pcf50633_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
{
struct pcf50633 *pcf = gpio_chip_to_pcf50633(chip);
return pcf50633_reg_read(pcf, PCF50633_REG_GPIOCFG(gpio)) >> 3;
}
static int pcf50633_gpio_direction_output(struct gpio_chip *chip, unsigned gpio,
int value)
{
struct pcf50633 *pcf = gpio_chip_to_pcf50633(chip);
int ret;
ret = pcf50633_gpio_set_config(pcf, pcf->pdata->gpio_base + gpio,
PCF50633_GPIO_CONFIG_OUTPUT);
if (!ret)
pcf50633_gpio_set_value(chip, gpio, value);
return ret;
}
static int pcf50633_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
return -ENOSYS;
}
int pcf50633_gpio_set_config(struct pcf50633 *pcf, unsigned gpio,
enum pcf50633_gpio_config config)
{
u8 reg;
u8 direction;
int ret;
gpio -= pcf->pdata->gpio_base;
if (gpio < 3) {
direction = (config == PCF50633_GPIO_CONFIG_INPUT) ? (1 << gpio) : 0;
ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_GPIOCTL, (1 << gpio),
direction);
if (ret) {
return ret;
}
} else if (gpio > 3 || config == PCF50633_GPIO_CONFIG_INPUT) {
return -EINVAL;
}
if (config != PCF50633_GPIO_CONFIG_INPUT) {
reg = PCF50633_REG_GPIOCFG(gpio);
ret = pcf50633_reg_set_bit_mask(pcf, reg, 0x0f, config);
}
return ret;
}
EXPORT_SYMBOL_GPL(pcf50633_gpio_set_config);
int pcf50633_gpio_power_supply_set(struct pcf50633 *pcf,
int gpio, int regulator, int on)
{
u8 reg, val, mask;
gpio -= pcf->pdata->gpio_base;
/* the *ENA register is always one after the *OUT register */
reg = pcf50633_regulator_registers[regulator] + 1;
val = !!on << (gpio - PCF50633_GPIO1);
mask = 1 << (gpio - PCF50633_GPIO1);
return pcf50633_reg_set_bit_mask(pcf, reg, mask, val);
}
EXPORT_SYMBOL_GPL(pcf50633_gpio_power_supply_set);
static int __devinit pcf50633_gpio_probe(struct platform_device *pdev)
{
struct pcf50633 *pcf = dev_to_pcf50633(pdev->dev.parent);
struct pcf50633_gpio *pcf_gpio;
pcf_gpio = kzalloc(sizeof(*pcf_gpio), GFP_KERNEL);
if (!pcf_gpio)
return -ENOMEM;
pcf_gpio->pcf = pcf;
pcf_gpio->chip.direction_input = pcf50633_gpio_direction_input;
pcf_gpio->chip.direction_output = pcf50633_gpio_direction_output;
pcf_gpio->chip.get = pcf50633_gpio_get_value;
pcf_gpio->chip.set = pcf50633_gpio_set_value;
pcf_gpio->chip.base = pcf->pdata->gpio_base;
pcf_gpio->chip.ngpio = 4;
pcf_gpio->chip.label = dev_name(pcf->dev);
pcf_gpio->chip.can_sleep = 1;
pcf_gpio->chip.owner = THIS_MODULE;
pcf_gpio->chip.dev = &pdev->dev;
platform_set_drvdata(pdev, pcf_gpio);
return gpiochip_add(&pcf_gpio->chip);
}
static int __devexit pcf50633_gpio_remove(struct platform_device *pdev)
{
struct pcf50633_gpio *pcf_gpio = platform_get_drvdata(pdev);
gpiochip_remove(&pcf_gpio->chip);
platform_set_drvdata(pdev, NULL);
kfree(pcf_gpio);
return 0;
}
static struct platform_driver pcf50633_gpio_driver = {
.probe = pcf50633_gpio_probe,
.remove = __devexit_p(pcf50633_gpio_remove),
.driver = {
.name = "pcf50633-gpio",
.owner = THIS_MODULE,
},
};
int __init pcf50633_gpio_init(void)
{
return platform_driver_register(&pcf50633_gpio_driver);
}
module_init(pcf50633_gpio_init);
void __exit pcf50633_gpio_exit(void)
{
platform_driver_unregister(&pcf50633_gpio_driver);
}
module_exit(pcf50633_gpio_exit);
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("GPIO driver for the PCF50633");
MODULE_LICENSE("GPL");
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