Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 3d50a278 authored by Laxman Dewangan's avatar Laxman Dewangan Committed by Samuel Ortiz
Browse files

gpio: palmas: Add support for Palmas GPIO 



Add gpio driver for TI Palmas series PMIC. This has 8 gpio which can
work as input/output.

Signed-off-by: default avatarLaxman Dewangan <ldewangan@nvidia.com>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 60c185f0

drivers/gpio/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -663,6 +663,13 @@ config GPIO_AB8500 
	help

	  Select this to enable the AB8500 IC GPIO driver



config GPIO_PALMAS

	bool "TI PALMAS series PMICs GPIO"

	depends on MFD_PALMAS

	help

	  Select this option to enable GPIO driver for the TI PALMAS

	  series chip family.



config GPIO_TPS6586X

	bool "TPS6586X GPIO"

	depends on MFD_TPS6586X

drivers/gpio/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -69,6 +69,7 @@ obj-$(CONFIG_GPIO_TC3589X) += gpio-tc3589x.o 
obj-$(CONFIG_ARCH_TEGRA)	+= gpio-tegra.o

obj-$(CONFIG_GPIO_TIMBERDALE)	+= gpio-timberdale.o

obj-$(CONFIG_ARCH_DAVINCI_TNETV107X) += gpio-tnetv107x.o

obj-$(CONFIG_GPIO_PALMAS)	+= gpio-palmas.o

obj-$(CONFIG_GPIO_TPS6586X)	+= gpio-tps6586x.o

obj-$(CONFIG_GPIO_TPS65910)	+= gpio-tps65910.o

obj-$(CONFIG_GPIO_TPS65912)	+= gpio-tps65912.o

drivers/gpio/gpio-palmas.c

0 → 100644
+184 −0
Original line number Diff line number Diff line 
/*

 * TI Palma series PMIC's GPIO driver.

 *

 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.

 *

 * Author: Laxman Dewangan <ldewangan@nvidia.com>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */



#include <linux/gpio.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/mfd/palmas.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>



struct palmas_gpio {

	struct gpio_chip gpio_chip;

	struct palmas *palmas;

};



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_get(struct gpio_chip *gc, unsigned offset)

{

	struct palmas_gpio *pg = to_palmas_gpio(gc);

	struct palmas *palmas = pg->palmas;

	unsigned int val;

	int ret;



	ret = palmas_read(palmas, PALMAS_GPIO_BASE, PALMAS_GPIO_DATA_IN, &val);

	if (ret < 0) {

		dev_err(gc->dev, "GPIO_DATA_IN read failed, err = %d\n", ret);

		return ret;

	}

	return !!(val & BIT(offset));

}



static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,

			int value)

{

	struct palmas_gpio *pg = to_palmas_gpio(gc);

	struct palmas *palmas = pg->palmas;

	int ret;



	if (value)

		ret = palmas_write(palmas, PALMAS_GPIO_BASE,

				PALMAS_GPIO_SET_DATA_OUT, BIT(offset));

	else

		ret = palmas_write(palmas, PALMAS_GPIO_BASE,

				PALMAS_GPIO_CLEAR_DATA_OUT, BIT(offset));

	if (ret < 0)

		dev_err(gc->dev, "%s write failed, err = %d\n",

			(value) ? "GPIO_SET_DATA_OUT" : "GPIO_CLEAR_DATA_OUT",

			ret);

}



static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,

				int value)

{

	struct palmas_gpio *pg = to_palmas_gpio(gc);

	struct palmas *palmas = pg->palmas;

	int ret;



	/* Set the initial value */

	palmas_gpio_set(gc, offset, value);



	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE,

		PALMAS_GPIO_DATA_DIR, BIT(offset), BIT(offset));

	if (ret < 0)

		dev_err(gc->dev, "GPIO_DATA_DIR write failed, err = %d\n", ret);

	return ret;

}



static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)

{

	struct palmas_gpio *pg = to_palmas_gpio(gc);

	struct palmas *palmas = pg->palmas;

	int ret;



	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE,

		PALMAS_GPIO_DATA_DIR, BIT(offset), 0);

	if (ret < 0)

		dev_err(gc->dev, "GPIO_DATA_DIR write failed, err = %d\n", ret);

	return ret;

}



static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)

{

	struct palmas_gpio *pg = to_palmas_gpio(gc);

	struct palmas *palmas = pg->palmas;



	return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);

}



static int palmas_gpio_probe(struct platform_device *pdev)

{

	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);

	struct palmas_platform_data *palmas_pdata;

	struct palmas_gpio *palmas_gpio;

	int ret;



	palmas_gpio = devm_kzalloc(&pdev->dev,

				sizeof(*palmas_gpio), GFP_KERNEL);

	if (!palmas_gpio) {

		dev_err(&pdev->dev, "Could not allocate palmas_gpio\n");

		return -ENOMEM;

	}



	palmas_gpio->palmas = palmas;

	palmas_gpio->gpio_chip.owner = THIS_MODULE;

	palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);

	palmas_gpio->gpio_chip.ngpio = 8;

	palmas_gpio->gpio_chip.can_sleep = 1;

	palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;

	palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;

	palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;

	palmas_gpio->gpio_chip.set	= palmas_gpio_set;

	palmas_gpio->gpio_chip.get	= palmas_gpio_get;

	palmas_gpio->gpio_chip.dev = &pdev->dev;

#ifdef CONFIG_OF_GPIO

	palmas_gpio->gpio_chip.of_node = palmas->dev->of_node;

#endif

	palmas_pdata = dev_get_platdata(palmas->dev);

	if (palmas_pdata && palmas_pdata->gpio_base)

		palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;

	else

		palmas_gpio->gpio_chip.base = -1;



	ret = gpiochip_add(&palmas_gpio->gpio_chip);

	if (ret < 0) {

		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);

		return ret;

	}



	platform_set_drvdata(pdev, palmas_gpio);

	return ret;

}



static int palmas_gpio_remove(struct platform_device *pdev)

{

	struct palmas_gpio *palmas_gpio = platform_get_drvdata(pdev);



	return gpiochip_remove(&palmas_gpio->gpio_chip);

}



static struct platform_driver palmas_gpio_driver = {

	.driver.name	= "palmas-gpio",

	.driver.owner	= THIS_MODULE,

	.probe		= palmas_gpio_probe,

	.remove		= 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_ALIAS("platform:palmas-gpio");

MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");

MODULE_DESCRIPTION("GPIO driver for TI Palmas series PMICs");

MODULE_LICENSE("GPL v2");