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Commit e9fe32bc authored by Laxman Dewangan's avatar Laxman Dewangan Committed by Grant Likely
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gpio/rc5t583: add gpio driver for RICOH PMIC RC5T583 



The PMIC device RC5T583 from RICOH supports 8 gpios.
Adding gpio driver for this device to access the pins
control through gpio library.

Signed-off-by: default avatarLaxman Dewangan <ldewangan@nvidia.com>
[grant.likely: slight cosmetic changes]
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent ee1c1e7d

drivers/gpio/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -301,6 +301,15 @@ config GPIO_PCF857X 
	  This driver provides an in-kernel interface to those GPIOs using

	  platform-neutral GPIO calls.



config GPIO_RC5T583

	bool "RICOH RC5T583 GPIO"

	depends on MFD_RC5T583

	help

	  Select this option to enable GPIO driver for the Ricoh RC5T583

	  chip family.

	  This driver provides the support for driving/reading the gpio pins

	  of RC5T583 device through standard gpio library.



config GPIO_SX150X

	bool "Semtech SX150x I2C GPIO expander"

	depends on I2C=y

drivers/gpio/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ obj-$(CONFIG_GPIO_PCF857X) += gpio-pcf857x.o 
obj-$(CONFIG_GPIO_PCH)		+= gpio-pch.o

obj-$(CONFIG_GPIO_PL061)	+= gpio-pl061.o

obj-$(CONFIG_GPIO_PXA)		+= gpio-pxa.o

obj-$(CONFIG_GPIO_RC5T583)	+= gpio-rc5t583.o

obj-$(CONFIG_GPIO_RDC321X)	+= gpio-rdc321x.o

obj-$(CONFIG_PLAT_SAMSUNG)	+= gpio-samsung.o

obj-$(CONFIG_ARCH_SA1100)	+= gpio-sa1100.o

drivers/gpio/gpio-rc5t583.c

0 → 100644
+180 −0
Original line number Diff line number Diff line 
/*

 * GPIO driver for RICOH583 power management chip.

 *

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

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

 *

 * Based on code

 *	Copyright (C) 2011 RICOH COMPANY,LTD

 *

 * 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/init.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/device.h>

#include <linux/gpio.h>

#include <linux/mfd/rc5t583.h>



struct rc5t583_gpio {

	struct gpio_chip gpio_chip;

	struct rc5t583 *rc5t583;

};



static inline struct rc5t583_gpio *to_rc5t583_gpio(struct gpio_chip *chip)

{

	return container_of(chip, struct rc5t583_gpio, gpio_chip);

}



static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset)

{

	struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);

	struct device *parent = rc5t583_gpio->rc5t583->dev;

	uint8_t val = 0;

	int ret;



	ret = rc5t583_read(parent, RC5T583_GPIO_MON_IOIN, &val);

	if (ret < 0)

		return ret;



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

}



static void rc5t583_gpio_set(struct gpio_chip *gc, unsigned int offset, int val)

{

	struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);

	struct device *parent = rc5t583_gpio->rc5t583->dev;

	if (val)

		rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));

	else

		rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));

}



static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)

{

	struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);

	struct device *parent = rc5t583_gpio->rc5t583->dev;

	int ret;



	ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));

	if (ret < 0)

		return ret;



	/* Set pin to gpio mode */

	return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));

}



static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset,

			int value)

{

	struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);

	struct device *parent = rc5t583_gpio->rc5t583->dev;

	int ret;



	rc5t583_gpio_set(gc, offset, value);

	ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));

	if (ret < 0)

		return ret;



	/* Set pin to gpio mode */

	return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));

}



static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset)

{

	struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);



	if ((offset >= 0) && (offset < 8))

		return rc5t583_gpio->rc5t583->irq_base +

				RC5T583_IRQ_GPIO0 + offset;

	return -EINVAL;

}



static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset)

{

	struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);

	struct device *parent = rc5t583_gpio->rc5t583->dev;



	rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));

}



static int __devinit rc5t583_gpio_probe(struct platform_device *pdev)

{

	struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);

	struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);

	struct rc5t583_gpio *rc5t583_gpio;



	rc5t583_gpio = devm_kzalloc(&pdev->dev, sizeof(*rc5t583_gpio),

					GFP_KERNEL);

	if (!rc5t583_gpio) {

		dev_warn(&pdev->dev, "Mem allocation for rc5t583_gpio failed");

		return -ENOMEM;

	}



	rc5t583_gpio->gpio_chip.label = "gpio-rc5t583",

	rc5t583_gpio->gpio_chip.owner = THIS_MODULE,

	rc5t583_gpio->gpio_chip.free = rc5t583_gpio_free,

	rc5t583_gpio->gpio_chip.direction_input = rc5t583_gpio_dir_input,

	rc5t583_gpio->gpio_chip.direction_output = rc5t583_gpio_dir_output,

	rc5t583_gpio->gpio_chip.set = rc5t583_gpio_set,

	rc5t583_gpio->gpio_chip.get = rc5t583_gpio_get,

	rc5t583_gpio->gpio_chip.to_irq = rc5t583_gpio_to_irq,

	rc5t583_gpio->gpio_chip.ngpio = RC5T583_MAX_GPIO,

	rc5t583_gpio->gpio_chip.can_sleep = 1,

	rc5t583_gpio->gpio_chip.dev = &pdev->dev;

	rc5t583_gpio->gpio_chip.base = -1;

	rc5t583_gpio->rc5t583 = rc5t583;



	if (pdata && pdata->gpio_base)

		rc5t583_gpio->gpio_chip.base = pdata->gpio_base;



	platform_set_drvdata(pdev, rc5t583_gpio);



	return gpiochip_add(&rc5t583_gpio->gpio_chip);

}



static int __devexit rc5t583_gpio_remove(struct platform_device *pdev)

{

	struct rc5t583_gpio *rc5t583_gpio = platform_get_drvdata(pdev);



	return gpiochip_remove(&rc5t583_gpio->gpio_chip);

}



static struct platform_driver rc5t583_gpio_driver = {

	.driver = {

		.name    = "rc5t583-gpio",

		.owner   = THIS_MODULE,

	},

	.probe		= rc5t583_gpio_probe,

	.remove		= __devexit_p(rc5t583_gpio_remove),

};



static int __init rc5t583_gpio_init(void)

{

	return platform_driver_register(&rc5t583_gpio_driver);

}

subsys_initcall(rc5t583_gpio_init);



static void __exit rc5t583_gpio_exit(void)

{

	platform_driver_unregister(&rc5t583_gpio_driver);

}

module_exit(rc5t583_gpio_exit);



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

MODULE_DESCRIPTION("GPIO interface for RC5T583");

MODULE_LICENSE("GPL v2");

MODULE_ALIAS("platform:rc5t583-gpio");

include/linux/mfd/rc5t583.h

+2 −0
Original line number Diff line number Diff line
@@ -272,11 +272,13 @@ struct rc5t583 { 
 * rc5t583_platform_data: Platform data for ricoh rc5t583 pmu.

 * The board specific data is provided through this structure.

 * @irq_base: Irq base number on which this device registers their interrupts.

 * @gpio_base: GPIO base from which gpio of this device will start.

 * @enable_shutdown: Enable shutdown through the input pin "shutdown".

 */



struct rc5t583_platform_data {

	int		irq_base;

	int		gpio_base;

	bool		enable_shutdown;

};