[mirror_ubuntu-artful-kernel.git] / drivers / gpio / gpio-da9055.c

/*
 * 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 int da9055_gpio_get(struct gpio_chip *gc, unsigned offset)
{
	struct da9055_gpio *gpio = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(gc);
	struct da9055 *da9055 = gpio->da9055;

	return regmap_irq_get_virq(da9055->irq_data,
				  DA9055_IRQ_GPI0 + offset);
}

static const struct gpio_chip reference_gp = {
	.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 = true,
	.ngpio = 3,
	.base = -1,
};

static int 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)
		return -ENOMEM;

	gpio->da9055 = dev_get_drvdata(pdev->dev.parent);
	pdata = dev_get_platdata(gpio->da9055->dev);

	gpio->gp = reference_gp;
	if (pdata && pdata->gpio_base)
		gpio->gp.base = pdata->gpio_base;

	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
	if (ret < 0) {
		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
		return ret;
	}

	platform_set_drvdata(pdev, gpio);

	return 0;
}

static struct platform_driver da9055_gpio_driver = {
	.probe = da9055_gpio_probe,
	.driver = {
		.name	= "da9055-gpio",
	},
};

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");
Commit	Line	Data
04ed4279 AJ	1	/*
	2	* GPIO Driver for Dialog DA9055 PMICs.
	3	*
	4	* Copyright(c) 2012 Dialog Semiconductor Ltd.
	5	*
	6	* Author: David Dajun Chen <dchen@diasemi.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*
	13	*/
	14	#include <linux/module.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/gpio.h>
	17
	18	#include <linux/mfd/da9055/core.h>
	19	#include <linux/mfd/da9055/reg.h>
	20	#include <linux/mfd/da9055/pdata.h>
	21
	22	#define DA9055_VDD_IO 0x0
	23	#define DA9055_PUSH_PULL 0x3
	24	#define DA9055_ACT_LOW 0x0
	25	#define DA9055_GPI 0x1
	26	#define DA9055_PORT_MASK 0x3
	27	#define DA9055_PORT_SHIFT(offset) (4 * (offset % 2))
	28
	29	#define DA9055_INPUT DA9055_GPI
	30	#define DA9055_OUTPUT DA9055_PUSH_PULL
	31	#define DA9055_IRQ_GPI0 3
	32
	33	struct da9055_gpio {
	34	struct da9055 *da9055;
	35	struct gpio_chip gp;
	36	};
	37
04ed4279 AJ	38	static int da9055_gpio_get(struct gpio_chip *gc, unsigned offset)
04ed4279 AJ	39	{
552dd795	40	struct da9055_gpio *gpio = gpiochip_get_data(gc);
04ed4279 AJ	41	int gpio_direction = 0;
	42	int ret;
	43
	44	/* Get GPIO direction */
	45	ret = da9055_reg_read(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1);
	46	if (ret < 0)
	47	return ret;
	48
	49	gpio_direction = ret & (DA9055_PORT_MASK) << DA9055_PORT_SHIFT(offset);
	50	gpio_direction >>= DA9055_PORT_SHIFT(offset);
	51	switch (gpio_direction) {
	52	case DA9055_INPUT:
	53	ret = da9055_reg_read(gpio->da9055, DA9055_REG_STATUS_B);
	54	if (ret < 0)
	55	return ret;
	56	break;
	57	case DA9055_OUTPUT:
	58	ret = da9055_reg_read(gpio->da9055, DA9055_REG_GPIO_MODE0_2);
	59	if (ret < 0)
	60	return ret;
	61	}
	62
	63	return ret & (1 << offset);
	64
	65	}
	66
	67	static void da9055_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
	68	{
552dd795	69	struct da9055_gpio *gpio = gpiochip_get_data(gc);
04ed4279 AJ	70
	71	da9055_reg_update(gpio->da9055,
	72	DA9055_REG_GPIO_MODE0_2,
	73	1 << offset,
	74	value << offset);
	75	}
	76
	77	static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
	78	{
552dd795	79	struct da9055_gpio *gpio = gpiochip_get_data(gc);
04ed4279 AJ	80	unsigned char reg_byte;
	81
	82	reg_byte = (DA9055_ACT_LOW \| DA9055_GPI)
	83	<< DA9055_PORT_SHIFT(offset);
	84
	85	return da9055_reg_update(gpio->da9055, (offset >> 1) +
	86	DA9055_REG_GPIO0_1,
	87	DA9055_PORT_MASK <<
	88	DA9055_PORT_SHIFT(offset),
	89	reg_byte);
	90	}
	91
	92	static int da9055_gpio_direction_output(struct gpio_chip *gc,
	93	unsigned offset, int value)
	94	{
552dd795	95	struct da9055_gpio *gpio = gpiochip_get_data(gc);
04ed4279 AJ	96	unsigned char reg_byte;
	97	int ret;
	98
	99	reg_byte = (DA9055_VDD_IO \| DA9055_PUSH_PULL)
	100	<< DA9055_PORT_SHIFT(offset);
	101
	102	ret = da9055_reg_update(gpio->da9055, (offset >> 1) +
	103	DA9055_REG_GPIO0_1,
	104	DA9055_PORT_MASK <<
	105	DA9055_PORT_SHIFT(offset),
	106	reg_byte);
	107	if (ret < 0)
	108	return ret;
	109
	110	da9055_gpio_set(gc, offset, value);
	111
	112	return 0;
	113	}
	114
	115	static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset)
	116	{
552dd795	117	struct da9055_gpio *gpio = gpiochip_get_data(gc);
04ed4279 AJ	118	struct da9055 *da9055 = gpio->da9055;
	119
	120	return regmap_irq_get_virq(da9055->irq_data,
	121	DA9055_IRQ_GPI0 + offset);
	122	}
	123
e35b5ab0	124	static const struct gpio_chip reference_gp = {
04ed4279 AJ	125	.label = "da9055-gpio",
	126	.owner = THIS_MODULE,
	127	.get = da9055_gpio_get,
	128	.set = da9055_gpio_set,
	129	.direction_input = da9055_gpio_direction_input,
	130	.direction_output = da9055_gpio_direction_output,
	131	.to_irq = da9055_gpio_to_irq,
9fb1f39e	132	.can_sleep = true,
04ed4279 AJ	133	.ngpio = 3,
	134	.base = -1,
	135	};
	136
0fe763c5	137	static int da9055_gpio_probe(struct platform_device *pdev)
04ed4279 AJ	138	{
	139	struct da9055_gpio *gpio;
	140	struct da9055_pdata *pdata;
	141	int ret;
	142
	143	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
afeb7b45	144	if (!gpio)
04ed4279 AJ	145	return -ENOMEM;
	146
	147	gpio->da9055 = dev_get_drvdata(pdev->dev.parent);
e56aee18	148	pdata = dev_get_platdata(gpio->da9055->dev);
04ed4279 AJ	149
	150	gpio->gp = reference_gp;
	151	if (pdata && pdata->gpio_base)
	152	gpio->gp.base = pdata->gpio_base;
	153
7e9104cc	154	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
04ed4279 AJ	155	if (ret < 0) {
04ed4279 AJ	156	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
7e9104cc	157	return ret;
04ed4279 AJ	158	}
	159
	160	platform_set_drvdata(pdev, gpio);
	161
	162	return 0;
04ed4279 AJ	163	}
	164
	165	static struct platform_driver da9055_gpio_driver = {
	166	.probe = da9055_gpio_probe,
04ed4279 AJ	167	.driver = {
04ed4279 AJ	168	.name = "da9055-gpio",
04ed4279 AJ	169	},
	170	};
	171
	172	static int __init da9055_gpio_init(void)
	173	{
	174	return platform_driver_register(&da9055_gpio_driver);
	175	}
	176	subsys_initcall(da9055_gpio_init);
	177
	178	static void __exit da9055_gpio_exit(void)
	179	{
	180	platform_driver_unregister(&da9055_gpio_driver);
	181	}
	182	module_exit(da9055_gpio_exit);
	183
	184	MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
	185	MODULE_DESCRIPTION("DA9055 GPIO Device Driver");
	186	MODULE_LICENSE("GPL");
	187	MODULE_ALIAS("platform:da9055-gpio");