[linux-2.6-block.git] / drivers / gpio / gpio-rc5t583.c

/*
 * 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 int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset)
{
	struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(gc);

	if (offset < RC5T583_MAX_GPIO)
		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 = gpiochip_get_data(gc);
	struct device *parent = rc5t583_gpio->rc5t583->dev;

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

static int 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)
		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 = true,
	rc5t583_gpio->gpio_chip.parent = &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_data(&rc5t583_gpio->gpio_chip, rc5t583_gpio);
}

static int rc5t583_gpio_remove(struct platform_device *pdev)
{
	struct rc5t583_gpio *rc5t583_gpio = platform_get_drvdata(pdev);

	gpiochip_remove(&rc5t583_gpio->gpio_chip);
	return 0;
}

static struct platform_driver rc5t583_gpio_driver = {
	.driver = {
		.name    = "rc5t583-gpio",
	},
	.probe		= rc5t583_gpio_probe,
	.remove		= 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");
Commit	Line	Data
e9fe32bc LD	1	/*
	2	* GPIO driver for RICOH583 power management chip.
	3	*
	4	* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
	5	* Author: Laxman dewangan <ldewangan@nvidia.com>
	6	*
	7	* Based on code
	8	* Copyright (C) 2011 RICOH COMPANY,LTD
	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms and conditions of the GNU General Public License,
	12	* version 2, as published by the Free Software Foundation.
	13	*
	14	* This program is distributed in the hope it will be useful, but WITHOUT
	15	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	16	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	17	* more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	21	*
	22	*/
	23	#include <linux/init.h>
	24	#include <linux/kernel.h>
	25	#include <linux/slab.h>
	26	#include <linux/module.h>
	27	#include <linux/platform_device.h>
	28	#include <linux/device.h>
	29	#include <linux/gpio.h>
	30	#include <linux/mfd/rc5t583.h>
	31
	32	struct rc5t583_gpio {
	33	struct gpio_chip gpio_chip;
	34	struct rc5t583 *rc5t583;
	35	};
	36
e9fe32bc LD	37	static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset)
e9fe32bc LD	38	{
d660c68e	39	struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
e9fe32bc LD	40	struct device *parent = rc5t583_gpio->rc5t583->dev;
	41	uint8_t val = 0;
	42	int ret;
	43
	44	ret = rc5t583_read(parent, RC5T583_GPIO_MON_IOIN, &val);
	45	if (ret < 0)
	46	return ret;
	47
	48	return !!(val & BIT(offset));
	49	}
	50
	51	static void rc5t583_gpio_set(struct gpio_chip *gc, unsigned int offset, int val)
	52	{
d660c68e	53	struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
e9fe32bc LD	54	struct device *parent = rc5t583_gpio->rc5t583->dev;
	55	if (val)
	56	rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
	57	else
	58	rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
	59	}
	60
	61	static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
	62	{
d660c68e	63	struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
e9fe32bc LD	64	struct device *parent = rc5t583_gpio->rc5t583->dev;
	65	int ret;
	66
	67	ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
	68	if (ret < 0)
	69	return ret;
	70
	71	/* Set pin to gpio mode */
	72	return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
	73	}
	74
	75	static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset,
	76	int value)
	77	{
d660c68e	78	struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
e9fe32bc LD	79	struct device *parent = rc5t583_gpio->rc5t583->dev;
	80	int ret;
	81
	82	rc5t583_gpio_set(gc, offset, value);
	83	ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
	84	if (ret < 0)
	85	return ret;
	86
	87	/* Set pin to gpio mode */
	88	return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
	89	}
	90
	91	static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
	92	{
d660c68e	93	struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
e9fe32bc	94
3bde4d26	95	if (offset < RC5T583_MAX_GPIO)
e9fe32bc LD	96	return rc5t583_gpio->rc5t583->irq_base +
	97	RC5T583_IRQ_GPIO0 + offset;
	98	return -EINVAL;
	99	}
	100
	101	static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset)
	102	{
d660c68e	103	struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
e9fe32bc LD	104	struct device *parent = rc5t583_gpio->rc5t583->dev;
	105
	106	rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
	107	}
	108
3836309d	109	static int rc5t583_gpio_probe(struct platform_device *pdev)
e9fe32bc LD	110	{
	111	struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
	112	struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
	113	struct rc5t583_gpio *rc5t583_gpio;
	114
	115	rc5t583_gpio = devm_kzalloc(&pdev->dev, sizeof(*rc5t583_gpio),
	116	GFP_KERNEL);
4b7dfd7f	117	if (!rc5t583_gpio)
e9fe32bc	118	return -ENOMEM;
e9fe32bc LD	119
	120	rc5t583_gpio->gpio_chip.label = "gpio-rc5t583",
	121	rc5t583_gpio->gpio_chip.owner = THIS_MODULE,
	122	rc5t583_gpio->gpio_chip.free = rc5t583_gpio_free,
	123	rc5t583_gpio->gpio_chip.direction_input = rc5t583_gpio_dir_input,
	124	rc5t583_gpio->gpio_chip.direction_output = rc5t583_gpio_dir_output,
	125	rc5t583_gpio->gpio_chip.set = rc5t583_gpio_set,
	126	rc5t583_gpio->gpio_chip.get = rc5t583_gpio_get,
	127	rc5t583_gpio->gpio_chip.to_irq = rc5t583_gpio_to_irq,
	128	rc5t583_gpio->gpio_chip.ngpio = RC5T583_MAX_GPIO,
9fb1f39e	129	rc5t583_gpio->gpio_chip.can_sleep = true,
58383c78	130	rc5t583_gpio->gpio_chip.parent = &pdev->dev;
e9fe32bc LD	131	rc5t583_gpio->gpio_chip.base = -1;
	132	rc5t583_gpio->rc5t583 = rc5t583;
	133
	134	if (pdata && pdata->gpio_base)
	135	rc5t583_gpio->gpio_chip.base = pdata->gpio_base;
	136
	137	platform_set_drvdata(pdev, rc5t583_gpio);
	138
d660c68e	139	return gpiochip_add_data(&rc5t583_gpio->gpio_chip, rc5t583_gpio);
e9fe32bc LD	140	}
e9fe32bc LD	141
206210ce	142	static int rc5t583_gpio_remove(struct platform_device *pdev)
e9fe32bc LD	143	{
	144	struct rc5t583_gpio *rc5t583_gpio = platform_get_drvdata(pdev);
	145
9f5132ae	146	gpiochip_remove(&rc5t583_gpio->gpio_chip);
9f5132ae	147	return 0;
e9fe32bc LD	148	}
	149
	150	static struct platform_driver rc5t583_gpio_driver = {
	151	.driver = {
	152	.name = "rc5t583-gpio",
e9fe32bc LD	153	},
e9fe32bc LD	154	.probe = rc5t583_gpio_probe,
8283c4ff	155	.remove = rc5t583_gpio_remove,
e9fe32bc LD	156	};
	157
	158	static int __init rc5t583_gpio_init(void)
	159	{
	160	return platform_driver_register(&rc5t583_gpio_driver);
	161	}
	162	subsys_initcall(rc5t583_gpio_init);
	163
	164	static void __exit rc5t583_gpio_exit(void)
	165	{
	166	platform_driver_unregister(&rc5t583_gpio_driver);
	167	}
	168	module_exit(rc5t583_gpio_exit);
	169
	170	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	171	MODULE_DESCRIPTION("GPIO interface for RC5T583");
	172	MODULE_LICENSE("GPL v2");
	173	MODULE_ALIAS("platform:rc5t583-gpio");