This is the GPIO patch for the DA9055 PMIC. This patch has got
dependency on the DA9055 MFD core.

This patch is functionally tested on SMDK6410 board.

Signed-off-by: David Dajun Chen <dchen@diasemi.com>
Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Ashish Jangam 2012-09-14 19:00:16 +05:30 коммит произвёл Linus Walleij
Родитель 086d585f13
Коммит 04ed427971
3 изменённых файлов: 216 добавлений и 0 удалений

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@ -86,6 +86,17 @@ config GPIO_DA9052
help
Say yes here to enable the GPIO driver for the DA9052 chip.
config GPIO_DA9055
tristate "Dialog Semiconductor DA9055 GPIO"
depends on MFD_DA9055
help
Say yes here to enable the GPIO driver for the DA9055 chip.
The Dialog DA9055 PMIC chip has 3 GPIO pins that can be
be controller by this driver.
If driver is built as a module it will be called gpio-da9055.
config GPIO_MAX730X
tristate

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@ -18,6 +18,7 @@ obj-$(CONFIG_GPIO_ARIZONA) += gpio-arizona.o
obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o
obj-$(CONFIG_GPIO_CS5535) += gpio-cs5535.o
obj-$(CONFIG_GPIO_DA9052) += gpio-da9052.o
obj-$(CONFIG_GPIO_DA9055) += gpio-da9055.o
obj-$(CONFIG_ARCH_DAVINCI) += gpio-davinci.o
obj-$(CONFIG_GPIO_EM) += gpio-em.o
obj-$(CONFIG_GPIO_EP93XX) += gpio-ep93xx.o

204
drivers/gpio/gpio-da9055.c Normal file
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@ -0,0 +1,204 @@
/*
* 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 __devinitdata = {
.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 = 1,
.ngpio = 3,
.base = -1,
};
static int __devinit 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 == NULL)
return -ENOMEM;
gpio->da9055 = dev_get_drvdata(pdev->dev.parent);
pdata = gpio->da9055->dev->platform_data;
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 __devexit da9055_gpio_remove(struct platform_device *pdev)
{
struct da9055_gpio *gpio = platform_get_drvdata(pdev);
return gpiochip_remove(&gpio->gp);
}
static struct platform_driver da9055_gpio_driver = {
.probe = da9055_gpio_probe,
.remove = __devexit_p(da9055_gpio_remove),
.driver = {
.name = "da9055-gpio",
.owner = THIS_MODULE,
},
};
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");