[deliverable/linux.git] / drivers / gpio / gpio-axp209.c

/*
 * AXP20x GPIO driver
 *
 * Copyright (C) 2016 Maxime Ripard <maxime.ripard@free-electrons.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/bitops.h>
#include <linux/device.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/axp20x.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>

#define AXP20X_GPIO_FUNCTIONS		0x7
#define AXP20X_GPIO_FUNCTION_OUT_LOW	0
#define AXP20X_GPIO_FUNCTION_OUT_HIGH	1
#define AXP20X_GPIO_FUNCTION_INPUT	2

struct axp20x_gpio {
	struct gpio_chip	chip;
	struct regmap		*regmap;
};

static int axp20x_gpio_get_reg(unsigned offset)
{
	switch (offset) {
	case 0:
		return AXP20X_GPIO0_CTRL;
	case 1:
		return AXP20X_GPIO1_CTRL;
	case 2:
		return AXP20X_GPIO2_CTRL;
	}

	return -EINVAL;
}

static int axp20x_gpio_input(struct gpio_chip *chip, unsigned offset)
{
	struct axp20x_gpio *gpio = gpiochip_get_data(chip);
	int reg;

	reg = axp20x_gpio_get_reg(offset);
	if (reg < 0)
		return reg;

	return regmap_update_bits(gpio->regmap, reg,
				  AXP20X_GPIO_FUNCTIONS,
				  AXP20X_GPIO_FUNCTION_INPUT);
}

static int axp20x_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct axp20x_gpio *gpio = gpiochip_get_data(chip);
	unsigned int val;
	int reg, ret;

	reg = axp20x_gpio_get_reg(offset);
	if (reg < 0)
		return reg;

	ret = regmap_read(gpio->regmap, reg, &val);
	if (ret)
		return ret;

	return !!(val & BIT(offset + 4));
}

static int axp20x_gpio_output(struct gpio_chip *chip, unsigned offset,
			      int value)
{
	struct axp20x_gpio *gpio = gpiochip_get_data(chip);
	int reg;

	reg = axp20x_gpio_get_reg(offset);
	if (reg < 0)
		return reg;

	return regmap_update_bits(gpio->regmap, reg,
				  AXP20X_GPIO_FUNCTIONS,
				  value ? AXP20X_GPIO_FUNCTION_OUT_HIGH
				  : AXP20X_GPIO_FUNCTION_OUT_LOW);
}

static void axp20x_gpio_set(struct gpio_chip *chip, unsigned offset,
			    int value)
{
	axp20x_gpio_output(chip, offset, value);
}

static int axp20x_gpio_probe(struct platform_device *pdev)
{
	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
	struct axp20x_gpio *gpio;
	int ret;

	if (!of_device_is_available(pdev->dev.of_node))
		return -ENODEV;

	if (!axp20x) {
		dev_err(&pdev->dev, "Parent drvdata not set\n");
		return -EINVAL;
	}

	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
	if (!gpio)
		return -ENOMEM;

	gpio->chip.base			= -1;
	gpio->chip.can_sleep		= true;
	gpio->chip.parent		= &pdev->dev;
	gpio->chip.label		= dev_name(&pdev->dev);
	gpio->chip.owner		= THIS_MODULE;
	gpio->chip.get			= axp20x_gpio_get;
	gpio->chip.set			= axp20x_gpio_set;
	gpio->chip.direction_input	= axp20x_gpio_input;
	gpio->chip.direction_output	= axp20x_gpio_output;
	gpio->chip.ngpio		= 3;

	gpio->regmap = axp20x->regmap;

	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
	if (ret) {
		dev_err(&pdev->dev, "Failed to register GPIO chip\n");
		return ret;
	}

	dev_info(&pdev->dev, "AXP209 GPIO driver loaded\n");

	return 0;
}

static const struct of_device_id axp20x_gpio_match[] = {
	{ .compatible = "x-powers,axp209-gpio" },
	{ }
};
MODULE_DEVICE_TABLE(of, axp20x_gpio_match);

static struct platform_driver axp20x_gpio_driver = {
	.probe		= axp20x_gpio_probe,
	.driver = {
		.name		= "axp20x-gpio",
		.of_match_table	= axp20x_gpio_match,
	},
};

module_platform_driver(axp20x_gpio_driver);

MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("AXP20x PMIC GPIO driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
f72f4b44 MR	1	/*
	2	* AXP20x GPIO driver
	3	*
	4	* Copyright (C) 2016 Maxime Ripard <maxime.ripard@free-electrons.com>
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the
	8	* Free Software Foundation; either version 2 of the License, or (at your
	9	* option) any later version.
	10	*/
	11
	12	#include <linux/bitops.h>
	13	#include <linux/device.h>
	14	#include <linux/gpio/driver.h>
	15	#include <linux/init.h>
	16	#include <linux/interrupt.h>
	17	#include <linux/kernel.h>
	18	#include <linux/mfd/axp20x.h>
	19	#include <linux/module.h>
	20	#include <linux/of.h>
	21	#include <linux/platform_device.h>
	22	#include <linux/regmap.h>
	23	#include <linux/slab.h>
	24
	25	#define AXP20X_GPIO_FUNCTIONS 0x7
	26	#define AXP20X_GPIO_FUNCTION_OUT_LOW 0
	27	#define AXP20X_GPIO_FUNCTION_OUT_HIGH 1
	28	#define AXP20X_GPIO_FUNCTION_INPUT 2
	29
	30	struct axp20x_gpio {
	31	struct gpio_chip chip;
	32	struct regmap *regmap;
	33	};
	34
	35	static int axp20x_gpio_get_reg(unsigned offset)
	36	{
	37	switch (offset) {
	38	case 0:
	39	return AXP20X_GPIO0_CTRL;
	40	case 1:
	41	return AXP20X_GPIO1_CTRL;
	42	case 2:
	43	return AXP20X_GPIO2_CTRL;
	44	}
	45
	46	return -EINVAL;
	47	}
	48
	49	static int axp20x_gpio_input(struct gpio_chip *chip, unsigned offset)
	50	{
	51	struct axp20x_gpio *gpio = gpiochip_get_data(chip);
	52	int reg;
	53
	54	reg = axp20x_gpio_get_reg(offset);
	55	if (reg < 0)
	56	return reg;
	57
	58	return regmap_update_bits(gpio->regmap, reg,
	59	AXP20X_GPIO_FUNCTIONS,
	60	AXP20X_GPIO_FUNCTION_INPUT);
	61	}
	62
	63	static int axp20x_gpio_get(struct gpio_chip *chip, unsigned offset)
	64	{
65	struct axp20x_gpio *gpio = gpiochip_get_data(chip);
66	unsigned int val;
67	int reg, ret;
68
69	reg = axp20x_gpio_get_reg(offset);
70	if (reg < 0)
71	return reg;
72
73	ret = regmap_read(gpio->regmap, reg, &val);
74	if (ret)
75	return ret;
76
77	return !!(val & BIT(offset + 4));
78	}
79
80	static int axp20x_gpio_output(struct gpio_chip *chip, unsigned offset,
81	int value)
82	{
83	struct axp20x_gpio *gpio = gpiochip_get_data(chip);
84	int reg;
85
86	reg = axp20x_gpio_get_reg(offset);
87	if (reg < 0)
88	return reg;
89
90	return regmap_update_bits(gpio->regmap, reg,
91	AXP20X_GPIO_FUNCTIONS,
92	value ? AXP20X_GPIO_FUNCTION_OUT_HIGH
93	: AXP20X_GPIO_FUNCTION_OUT_LOW);
94	}
95
96	static void axp20x_gpio_set(struct gpio_chip *chip, unsigned offset,
97	int value)
98	{
99	axp20x_gpio_output(chip, offset, value);
100	}
101
102	static int axp20x_gpio_probe(struct platform_device *pdev)
103	{
104	struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
105	struct axp20x_gpio *gpio;
106	int ret;
107
108	if (!of_device_is_available(pdev->dev.of_node))
109	return -ENODEV;
110
111	if (!axp20x) {
112	dev_err(&pdev->dev, "Parent drvdata not set\n");
113	return -EINVAL;
114	}
115
116	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
117	if (!gpio)
118	return -ENOMEM;
119
120	gpio->chip.base = -1;
121	gpio->chip.can_sleep = true;
122	gpio->chip.parent = &pdev->dev;
123	gpio->chip.label = dev_name(&pdev->dev);
124	gpio->chip.owner = THIS_MODULE;
125	gpio->chip.get = axp20x_gpio_get;
126	gpio->chip.set = axp20x_gpio_set;
127	gpio->chip.direction_input = axp20x_gpio_input;
128	gpio->chip.direction_output = axp20x_gpio_output;
129	gpio->chip.ngpio = 3;
130
131	gpio->regmap = axp20x->regmap;
132
133	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
134	if (ret) {
135	dev_err(&pdev->dev, "Failed to register GPIO chip\n");
136	return ret;
137	}
138
139	dev_info(&pdev->dev, "AXP209 GPIO driver loaded\n");
140
141	return 0;
142	}
143
144	static const struct of_device_id axp20x_gpio_match[] = {
145	{ .compatible = "x-powers,axp209-gpio" },
146	{ }
147	};
148	MODULE_DEVICE_TABLE(of, axp20x_gpio_match);
149
150	static struct platform_driver axp20x_gpio_driver = {
151	.probe = axp20x_gpio_probe,
152	.driver = {
153	.name = "axp20x-gpio",
154	.of_match_table = axp20x_gpio_match,
155	},
156	};
157
158	module_platform_driver(axp20x_gpio_driver);
159
160	MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
161	MODULE_DESCRIPTION("AXP20x PMIC GPIO driver");
162	MODULE_LICENSE("GPL");