mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Varka Bhadram](/assets/img/avatar_default.png)
Signed-off-by: Varka Bhadram <varkab@cdac.in> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
204 lines
4.7 KiB
C
204 lines
4.7 KiB
C
/*
|
|
* GPIO Driver for Dialog DA9055 PMICs.
|
|
*
|
|
* Copyright(c) 2012 Dialog Semiconductor Ltd.
|
|
*
|
|
* Author: David Dajun Chen <dchen@diasemi.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/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/gpio.h>
|
|
|
|
#include <linux/mfd/da9055/core.h>
|
|
#include <linux/mfd/da9055/reg.h>
|
|
#include <linux/mfd/da9055/pdata.h>
|
|
|
|
#define DA9055_VDD_IO 0x0
|
|
#define DA9055_PUSH_PULL 0x3
|
|
#define DA9055_ACT_LOW 0x0
|
|
#define DA9055_GPI 0x1
|
|
#define DA9055_PORT_MASK 0x3
|
|
#define DA9055_PORT_SHIFT(offset) (4 * (offset % 2))
|
|
|
|
#define DA9055_INPUT DA9055_GPI
|
|
#define DA9055_OUTPUT DA9055_PUSH_PULL
|
|
#define DA9055_IRQ_GPI0 3
|
|
|
|
struct da9055_gpio {
|
|
struct da9055 *da9055;
|
|
struct gpio_chip gp;
|
|
};
|
|
|
|
static inline struct da9055_gpio *to_da9055_gpio(struct gpio_chip *chip)
|
|
{
|
|
return container_of(chip, struct da9055_gpio, gp);
|
|
}
|
|
|
|
static int da9055_gpio_get(struct gpio_chip *gc, unsigned offset)
|
|
{
|
|
struct da9055_gpio *gpio = to_da9055_gpio(gc);
|
|
int gpio_direction = 0;
|
|
int ret;
|
|
|
|
/* Get GPIO direction */
|
|
ret = da9055_reg_read(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
gpio_direction = ret & (DA9055_PORT_MASK) << DA9055_PORT_SHIFT(offset);
|
|
gpio_direction >>= DA9055_PORT_SHIFT(offset);
|
|
switch (gpio_direction) {
|
|
case DA9055_INPUT:
|
|
ret = da9055_reg_read(gpio->da9055, DA9055_REG_STATUS_B);
|
|
if (ret < 0)
|
|
return ret;
|
|
break;
|
|
case DA9055_OUTPUT:
|
|
ret = da9055_reg_read(gpio->da9055, DA9055_REG_GPIO_MODE0_2);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return ret & (1 << offset);
|
|
|
|
}
|
|
|
|
static void da9055_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
|
|
{
|
|
struct da9055_gpio *gpio = to_da9055_gpio(gc);
|
|
|
|
da9055_reg_update(gpio->da9055,
|
|
DA9055_REG_GPIO_MODE0_2,
|
|
1 << offset,
|
|
value << offset);
|
|
}
|
|
|
|
static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
|
|
{
|
|
struct da9055_gpio *gpio = to_da9055_gpio(gc);
|
|
unsigned char reg_byte;
|
|
|
|
reg_byte = (DA9055_ACT_LOW | DA9055_GPI)
|
|
<< DA9055_PORT_SHIFT(offset);
|
|
|
|
return da9055_reg_update(gpio->da9055, (offset >> 1) +
|
|
DA9055_REG_GPIO0_1,
|
|
DA9055_PORT_MASK <<
|
|
DA9055_PORT_SHIFT(offset),
|
|
reg_byte);
|
|
}
|
|
|
|
static int da9055_gpio_direction_output(struct gpio_chip *gc,
|
|
unsigned offset, int value)
|
|
{
|
|
struct da9055_gpio *gpio = to_da9055_gpio(gc);
|
|
unsigned char reg_byte;
|
|
int ret;
|
|
|
|
reg_byte = (DA9055_VDD_IO | DA9055_PUSH_PULL)
|
|
<< DA9055_PORT_SHIFT(offset);
|
|
|
|
ret = da9055_reg_update(gpio->da9055, (offset >> 1) +
|
|
DA9055_REG_GPIO0_1,
|
|
DA9055_PORT_MASK <<
|
|
DA9055_PORT_SHIFT(offset),
|
|
reg_byte);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
da9055_gpio_set(gc, offset, value);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset)
|
|
{
|
|
struct da9055_gpio *gpio = to_da9055_gpio(gc);
|
|
struct da9055 *da9055 = gpio->da9055;
|
|
|
|
return regmap_irq_get_virq(da9055->irq_data,
|
|
DA9055_IRQ_GPI0 + offset);
|
|
}
|
|
|
|
static struct gpio_chip reference_gp = {
|
|
.label = "da9055-gpio",
|
|
.owner = THIS_MODULE,
|
|
.get = da9055_gpio_get,
|
|
.set = da9055_gpio_set,
|
|
.direction_input = da9055_gpio_direction_input,
|
|
.direction_output = da9055_gpio_direction_output,
|
|
.to_irq = da9055_gpio_to_irq,
|
|
.can_sleep = true,
|
|
.ngpio = 3,
|
|
.base = -1,
|
|
};
|
|
|
|
static int da9055_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct da9055_gpio *gpio;
|
|
struct da9055_pdata *pdata;
|
|
int ret;
|
|
|
|
gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
|
|
if (!gpio)
|
|
return -ENOMEM;
|
|
|
|
gpio->da9055 = dev_get_drvdata(pdev->dev.parent);
|
|
pdata = dev_get_platdata(gpio->da9055->dev);
|
|
|
|
gpio->gp = reference_gp;
|
|
if (pdata && pdata->gpio_base)
|
|
gpio->gp.base = pdata->gpio_base;
|
|
|
|
ret = gpiochip_add(&gpio->gp);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
|
|
goto err_mem;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, gpio);
|
|
|
|
return 0;
|
|
|
|
err_mem:
|
|
return ret;
|
|
}
|
|
|
|
static int da9055_gpio_remove(struct platform_device *pdev)
|
|
{
|
|
struct da9055_gpio *gpio = platform_get_drvdata(pdev);
|
|
|
|
gpiochip_remove(&gpio->gp);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver da9055_gpio_driver = {
|
|
.probe = da9055_gpio_probe,
|
|
.remove = da9055_gpio_remove,
|
|
.driver = {
|
|
.name = "da9055-gpio",
|
|
},
|
|
};
|
|
|
|
static int __init da9055_gpio_init(void)
|
|
{
|
|
return platform_driver_register(&da9055_gpio_driver);
|
|
}
|
|
subsys_initcall(da9055_gpio_init);
|
|
|
|
static void __exit da9055_gpio_exit(void)
|
|
{
|
|
platform_driver_unregister(&da9055_gpio_driver);
|
|
}
|
|
module_exit(da9055_gpio_exit);
|
|
|
|
MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
|
|
MODULE_DESCRIPTION("DA9055 GPIO Device Driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:da9055-gpio");
|