[mirror_ubuntu-artful-kernel.git] / drivers / gpio / gpio-bd9571mwv.c

/*
 * ROHM BD9571MWV-M GPIO driver
 *
 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether expressed or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License version 2 for more details.
 *
 * Based on the TPS65086 driver
 *
 * NOTE: Interrupts are not supported yet.
 */

#include <linux/gpio/driver.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <linux/mfd/bd9571mwv.h>

struct bd9571mwv_gpio {
	struct gpio_chip chip;
	struct bd9571mwv *bd;
};

static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
				       unsigned int offset)
{
	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
	int ret, val;

	ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_DIR, &val);
	if (ret < 0)
		return ret;

	return val & BIT(offset);
}

static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
					 unsigned int offset)
{
	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);

	regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
			   BIT(offset), 0);

	return 0;
}

static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
					  unsigned int offset, int value)
{
	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);

	/* Set the initial value */
	regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
			   BIT(offset), value ? BIT(offset) : 0);
	regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
			   BIT(offset), BIT(offset));

	return 0;
}

static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
	int ret, val;

	ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_IN, &val);
	if (ret < 0)
		return ret;

	return val & BIT(offset);
}

static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
			      int value)
{
	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);

	regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
			   BIT(offset), value ? BIT(offset) : 0);
}

static const struct gpio_chip template_chip = {
	.label			= "bd9571mwv-gpio",
	.owner			= THIS_MODULE,
	.get_direction		= bd9571mwv_gpio_get_direction,
	.direction_input	= bd9571mwv_gpio_direction_input,
	.direction_output	= bd9571mwv_gpio_direction_output,
	.get			= bd9571mwv_gpio_get,
	.set			= bd9571mwv_gpio_set,
	.base			= -1,
	.ngpio			= 2,
	.can_sleep		= true,
};

static int bd9571mwv_gpio_probe(struct platform_device *pdev)
{
	struct bd9571mwv_gpio *gpio;
	int ret;

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

	platform_set_drvdata(pdev, gpio);

	gpio->bd = dev_get_drvdata(pdev->dev.parent);
	gpio->chip = template_chip;
	gpio->chip.parent = gpio->bd->dev;

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

	return 0;
}

static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
	{ "bd9571mwv-gpio", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);

static struct platform_driver bd9571mwv_gpio_driver = {
	.driver = {
		.name = "bd9571mwv-gpio",
	},
	.probe = bd9571mwv_gpio_probe,
	.id_table = bd9571mwv_gpio_id_table,
};
module_platform_driver(bd9571mwv_gpio_driver);

MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
MODULE_DESCRIPTION("BD9571MWV GPIO driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
93847930 MV	1	/*
	2	* ROHM BD9571MWV-M GPIO driver
	3	*
	4	* Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	11	* kind, whether expressed or implied; without even the implied warranty
	12	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License version 2 for more details.
	14	*
	15	* Based on the TPS65086 driver
	16	*
	17	* NOTE: Interrupts are not supported yet.
	18	*/
	19
	20	#include <linux/gpio/driver.h>
	21	#include <linux/module.h>
	22	#include <linux/platform_device.h>
	23
	24	#include <linux/mfd/bd9571mwv.h>
	25
	26	struct bd9571mwv_gpio {
	27	struct gpio_chip chip;
	28	struct bd9571mwv *bd;
	29	};
	30
	31	static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
	32	unsigned int offset)
	33	{
	34	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
	35	int ret, val;
	36
	37	ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_DIR, &val);
	38	if (ret < 0)
	39	return ret;
	40
	41	return val & BIT(offset);
	42	}
	43
	44	static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
	45	unsigned int offset)
	46	{
	47	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
	48
	49	regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
	50	BIT(offset), 0);
	51
	52	return 0;
	53	}
	54
	55	static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
	56	unsigned int offset, int value)
	57	{
	58	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
	59
	60	/* Set the initial value */
	61	regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
	62	BIT(offset), value ? BIT(offset) : 0);
	63	regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
	64	BIT(offset), BIT(offset));
65
66	return 0;
67	}
68
69	static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
70	{
71	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
72	int ret, val;
73
74	ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_IN, &val);
75	if (ret < 0)
76	return ret;
77
78	return val & BIT(offset);
79	}
80
81	static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
82	int value)
83	{
84	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
85
86	regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
87	BIT(offset), value ? BIT(offset) : 0);
88	}
89
90	static const struct gpio_chip template_chip = {
91	.label = "bd9571mwv-gpio",
92	.owner = THIS_MODULE,
93	.get_direction = bd9571mwv_gpio_get_direction,
94	.direction_input = bd9571mwv_gpio_direction_input,
95	.direction_output = bd9571mwv_gpio_direction_output,
96	.get = bd9571mwv_gpio_get,
97	.set = bd9571mwv_gpio_set,
98	.base = -1,
99	.ngpio = 2,
100	.can_sleep = true,
101	};
102
103	static int bd9571mwv_gpio_probe(struct platform_device *pdev)
104	{
105	struct bd9571mwv_gpio *gpio;
106	int ret;
107
108	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
109	if (!gpio)
110	return -ENOMEM;
111
112	platform_set_drvdata(pdev, gpio);
113
114	gpio->bd = dev_get_drvdata(pdev->dev.parent);
115	gpio->chip = template_chip;
116	gpio->chip.parent = gpio->bd->dev;
117
118	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
119	if (ret < 0) {
120	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
121	return ret;
122	}
123
124	return 0;
125	}
126
127	static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
128	{ "bd9571mwv-gpio", },
129	{ /* sentinel */ }
130	};
131	MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
132
133	static struct platform_driver bd9571mwv_gpio_driver = {
134	.driver = {
135	.name = "bd9571mwv-gpio",
136	},
137	.probe = bd9571mwv_gpio_probe,
138	.id_table = bd9571mwv_gpio_id_table,
139	};
140	module_platform_driver(bd9571mwv_gpio_driver);
141
142	MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
143	MODULE_DESCRIPTION("BD9571MWV GPIO driver");
144	MODULE_LICENSE("GPL v2");