[linux-2.6-block.git] / drivers / gpio / gpio-bd9571mwv.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * ROHM BD9571MWV-M and BD9574MWF-M GPIO driver
 *
 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
 *
 * Based on the TPS65086 driver
 *
 * NOTE: Interrupts are not supported yet.
 */

#include <linux/gpio/driver.h>
#include <linux/mfd/rohm-generic.h>
#include <linux/module.h>
#include <linux/platform_device.h>

#include <linux/mfd/bd9571mwv.h>

struct bd9571mwv_gpio {
	struct regmap *regmap;
	struct gpio_chip chip;
};

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->regmap, BD9571MWV_GPIO_DIR, &val);
	if (ret < 0)
		return ret;
	if (val & BIT(offset))
		return GPIO_LINE_DIRECTION_IN;

	return GPIO_LINE_DIRECTION_OUT;
}

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->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->regmap, BD9571MWV_GPIO_OUT,
			   BIT(offset), value ? BIT(offset) : 0);
	regmap_update_bits(gpio->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->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->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->regmap = dev_get_regmap(pdev->dev.parent, NULL);
	gpio->chip = template_chip;
	gpio->chip.parent = pdev->dev.parent;

	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", ROHM_CHIP_TYPE_BD9571 },
	{ "bd9574mwf-gpio", ROHM_CHIP_TYPE_BD9574 },
	{ /* 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
b9f71d14	1	// SPDX-License-Identifier: GPL-2.0-only
93847930	2	/*
2e35627e	3	* ROHM BD9571MWV-M and BD9574MWF-M GPIO driver
93847930 MV	4	*
	5	* Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
	6	*
93847930 MV	7	* Based on the TPS65086 driver
	8	*
	9	* NOTE: Interrupts are not supported yet.
	10	*/
	11
	12	#include <linux/gpio/driver.h>
2e35627e	13	#include <linux/mfd/rohm-generic.h>
93847930 MV	14	#include <linux/module.h>
	15	#include <linux/platform_device.h>
	16
	17	#include <linux/mfd/bd9571mwv.h>
	18
	19	struct bd9571mwv_gpio {
2d7af444	20	struct regmap *regmap;
93847930	21	struct gpio_chip chip;
93847930 MV	22	};
	23
	24	static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
	25	unsigned int offset)
	26	{
	27	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
	28	int ret, val;
	29
2d7af444	30	ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_DIR, &val);
93847930 MV	31	if (ret < 0)
93847930 MV	32	return ret;
e42615ec MV	33	if (val & BIT(offset))
e42615ec MV	34	return GPIO_LINE_DIRECTION_IN;
93847930	35
e42615ec	36	return GPIO_LINE_DIRECTION_OUT;
93847930 MV	37	}
	38
	39	static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
	40	unsigned int offset)
	41	{
	42	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
	43
2d7af444	44	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR, BIT(offset), 0);
93847930 MV	45
	46	return 0;
	47	}
	48
	49	static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
	50	unsigned int offset, int value)
	51	{
	52	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
	53
	54	/* Set the initial value */
2d7af444	55	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
93847930	56	BIT(offset), value ? BIT(offset) : 0);
2d7af444	57	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR,
93847930 MV	58	BIT(offset), BIT(offset));
	59
	60	return 0;
	61	}
	62
	63	static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
	64	{
	65	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
	66	int ret, val;
	67
2d7af444	68	ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_IN, &val);
93847930 MV	69	if (ret < 0)
	70	return ret;
	71
	72	return val & BIT(offset);
	73	}
	74
	75	static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
	76	int value)
	77	{
	78	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
	79
2d7af444	80	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
93847930 MV	81	BIT(offset), value ? BIT(offset) : 0);
	82	}
	83
	84	static const struct gpio_chip template_chip = {
	85	.label = "bd9571mwv-gpio",
	86	.owner = THIS_MODULE,
	87	.get_direction = bd9571mwv_gpio_get_direction,
	88	.direction_input = bd9571mwv_gpio_direction_input,
	89	.direction_output = bd9571mwv_gpio_direction_output,
	90	.get = bd9571mwv_gpio_get,
	91	.set = bd9571mwv_gpio_set,
	92	.base = -1,
	93	.ngpio = 2,
	94	.can_sleep = true,
	95	};
	96
	97	static int bd9571mwv_gpio_probe(struct platform_device *pdev)
	98	{
	99	struct bd9571mwv_gpio *gpio;
	100	int ret;
	101
	102	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
	103	if (!gpio)
	104	return -ENOMEM;
	105
	106	platform_set_drvdata(pdev, gpio);
	107
2d7af444	108	gpio->regmap = dev_get_regmap(pdev->dev.parent, NULL);
93847930	109	gpio->chip = template_chip;
2d7af444	110	gpio->chip.parent = pdev->dev.parent;
93847930 MV	111
	112	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
	113	if (ret < 0) {
	114	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
	115	return ret;
	116	}
	117
	118	return 0;
	119	}
	120
	121	static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
2e35627e YS	122	{ "bd9571mwv-gpio", ROHM_CHIP_TYPE_BD9571 },
2e35627e YS	123	{ "bd9574mwf-gpio", ROHM_CHIP_TYPE_BD9574 },
93847930 MV	124	{ /* sentinel */ }
	125	};
	126	MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
	127
	128	static struct platform_driver bd9571mwv_gpio_driver = {
	129	.driver = {
	130	.name = "bd9571mwv-gpio",
	131	},
	132	.probe = bd9571mwv_gpio_probe,
	133	.id_table = bd9571mwv_gpio_id_table,
	134	};
	135	module_platform_driver(bd9571mwv_gpio_driver);
	136
	137	MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
	138	MODULE_DESCRIPTION("BD9571MWV GPIO driver");
	139	MODULE_LICENSE("GPL v2");