[deliverable/linux.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 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 < 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 = to_rc5t583_gpio(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.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 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
	37	static inline struct rc5t583_gpio to_rc5t583_gpio(struct gpio_chip chip)
	38	{
	39	return container_of(chip, struct rc5t583_gpio, gpio_chip);
	40	}
	41
	42	static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset)
	43	{
	44	struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
	45	struct device *parent = rc5t583_gpio->rc5t583->dev;
	46	uint8_t val = 0;
	47	int ret;
	48
	49	ret = rc5t583_read(parent, RC5T583_GPIO_MON_IOIN, &val);
	50	if (ret < 0)
	51	return ret;
	52
	53	return !!(val & BIT(offset));
	54	}
	55
	56	static void rc5t583_gpio_set(struct gpio_chip *gc, unsigned int offset, int val)
	57	{
	58	struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
	59	struct device *parent = rc5t583_gpio->rc5t583->dev;
	60	if (val)
	61	rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
	62	else
	63	rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
	64	}
65
66	static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
67	{
68	struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
69	struct device *parent = rc5t583_gpio->rc5t583->dev;
70	int ret;
71
72	ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
73	if (ret < 0)
74	return ret;
75
76	/* Set pin to gpio mode */
77	return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
78	}
79
80	static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset,
81	int value)
82	{
83	struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
84	struct device *parent = rc5t583_gpio->rc5t583->dev;
85	int ret;
86
87	rc5t583_gpio_set(gc, offset, value);
88	ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
89	if (ret < 0)
90	return ret;
91
92	/* Set pin to gpio mode */
93	return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
94	}
95
96	static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
97	{
98	struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
99
3bde4d26	100	if (offset < RC5T583_MAX_GPIO)
e9fe32bc LD	101	return rc5t583_gpio->rc5t583->irq_base +
	102	RC5T583_IRQ_GPIO0 + offset;
	103	return -EINVAL;
	104	}
	105
	106	static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset)
	107	{
	108	struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
	109	struct device *parent = rc5t583_gpio->rc5t583->dev;
	110
	111	rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
	112	}
	113
3836309d	114	static int rc5t583_gpio_probe(struct platform_device *pdev)
e9fe32bc LD	115	{
	116	struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
	117	struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
	118	struct rc5t583_gpio *rc5t583_gpio;
	119
	120	rc5t583_gpio = devm_kzalloc(&pdev->dev, sizeof(*rc5t583_gpio),
	121	GFP_KERNEL);
4b7dfd7f	122	if (!rc5t583_gpio)
e9fe32bc	123	return -ENOMEM;
e9fe32bc LD	124
	125	rc5t583_gpio->gpio_chip.label = "gpio-rc5t583",
	126	rc5t583_gpio->gpio_chip.owner = THIS_MODULE,
	127	rc5t583_gpio->gpio_chip.free = rc5t583_gpio_free,
	128	rc5t583_gpio->gpio_chip.direction_input = rc5t583_gpio_dir_input,
	129	rc5t583_gpio->gpio_chip.direction_output = rc5t583_gpio_dir_output,
	130	rc5t583_gpio->gpio_chip.set = rc5t583_gpio_set,
	131	rc5t583_gpio->gpio_chip.get = rc5t583_gpio_get,
	132	rc5t583_gpio->gpio_chip.to_irq = rc5t583_gpio_to_irq,
	133	rc5t583_gpio->gpio_chip.ngpio = RC5T583_MAX_GPIO,
9fb1f39e	134	rc5t583_gpio->gpio_chip.can_sleep = true,
e9fe32bc LD	135	rc5t583_gpio->gpio_chip.dev = &pdev->dev;
	136	rc5t583_gpio->gpio_chip.base = -1;
	137	rc5t583_gpio->rc5t583 = rc5t583;
	138
	139	if (pdata && pdata->gpio_base)
	140	rc5t583_gpio->gpio_chip.base = pdata->gpio_base;
	141
	142	platform_set_drvdata(pdev, rc5t583_gpio);
	143
	144	return gpiochip_add(&rc5t583_gpio->gpio_chip);
	145	}
	146
206210ce	147	static int rc5t583_gpio_remove(struct platform_device *pdev)
e9fe32bc LD	148	{
	149	struct rc5t583_gpio *rc5t583_gpio = platform_get_drvdata(pdev);
	150
9f5132ae	151	gpiochip_remove(&rc5t583_gpio->gpio_chip);
9f5132ae	152	return 0;
e9fe32bc LD	153	}
	154
	155	static struct platform_driver rc5t583_gpio_driver = {
	156	.driver = {
	157	.name = "rc5t583-gpio",
e9fe32bc LD	158	},
e9fe32bc LD	159	.probe = rc5t583_gpio_probe,
8283c4ff	160	.remove = rc5t583_gpio_remove,
e9fe32bc LD	161	};
	162
	163	static int __init rc5t583_gpio_init(void)
	164	{
	165	return platform_driver_register(&rc5t583_gpio_driver);
	166	}
	167	subsys_initcall(rc5t583_gpio_init);
	168
	169	static void __exit rc5t583_gpio_exit(void)
	170	{
	171	platform_driver_unregister(&rc5t583_gpio_driver);
	172	}
	173	module_exit(rc5t583_gpio_exit);
	174
	175	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	176	MODULE_DESCRIPTION("GPIO interface for RC5T583");
	177	MODULE_LICENSE("GPL v2");
	178	MODULE_ALIAS("platform:rc5t583-gpio");