Commit 04ed4279 authored by Ashish Jangam's avatar Ashish Jangam Committed by Linus Walleij
Browse files

DA9055 GPIO driver 



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: default avatarDavid Dajun Chen <dchen@diasemi.com>
Signed-off-by: default avatarAshish Jangam <ashish.jangam@kpitcummins.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 086d585f

drivers/gpio/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -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

drivers/gpio/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/gpio/gpio-da9055.c

0 → 100644
+204 −0
Original line number Diff line number Diff line 
/*

 * 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");