[mirror_ubuntu-hirsute-kernel.git] / drivers / gpio / gpio-bd71828.c

// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2018 ROHM Semiconductors

#include <linux/gpio/driver.h>
#include <linux/mfd/rohm-bd71828.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#define GPIO_OUT_REG(off) (BD71828_REG_GPIO_CTRL1 + (off))
#define HALL_GPIO_OFFSET 3

struct bd71828_gpio {
	struct rohm_regmap_dev chip;
	struct gpio_chip gpio;
};

static void bd71828_gpio_set(struct gpio_chip *chip, unsigned int offset,
			     int value)
{
	int ret;
	struct bd71828_gpio *bdgpio = gpiochip_get_data(chip);
	u8 val = (value) ? BD71828_GPIO_OUT_HI : BD71828_GPIO_OUT_LO;

	/*
	 * The HALL input pin can only be used as input. If this is the pin
	 * we are dealing with - then we are done
	 */
	if (offset == HALL_GPIO_OFFSET)
		return;

	ret = regmap_update_bits(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
				 BD71828_GPIO_OUT_MASK, val);
	if (ret)
		dev_err(bdgpio->chip.dev, "Could not set gpio to %d\n", value);
}

static int bd71828_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
	int ret;
	unsigned int val;
	struct bd71828_gpio *bdgpio = gpiochip_get_data(chip);

	if (offset == HALL_GPIO_OFFSET)
		ret = regmap_read(bdgpio->chip.regmap, BD71828_REG_IO_STAT,
				  &val);
	else
		ret = regmap_read(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
				  &val);
	if (!ret)
		ret = (val & BD71828_GPIO_OUT_MASK);

	return ret;
}

static int bd71828_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
				   unsigned long config)
{
	struct bd71828_gpio *bdgpio = gpiochip_get_data(chip);

	if (offset == HALL_GPIO_OFFSET)
		return -ENOTSUPP;

	switch (pinconf_to_config_param(config)) {
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
		return regmap_update_bits(bdgpio->chip.regmap,
					  GPIO_OUT_REG(offset),
					  BD71828_GPIO_DRIVE_MASK,
					  BD71828_GPIO_OPEN_DRAIN);
	case PIN_CONFIG_DRIVE_PUSH_PULL:
		return regmap_update_bits(bdgpio->chip.regmap,
					  GPIO_OUT_REG(offset),
					  BD71828_GPIO_DRIVE_MASK,
					  BD71828_GPIO_PUSH_PULL);
	default:
		break;
	}
	return -ENOTSUPP;
}

static int bd71828_get_direction(struct gpio_chip *chip, unsigned int offset)
{
	/*
	 * Pin usage is selected by OTP data. We can't read it runtime. Hence
	 * we trust that if the pin is not excluded by "gpio-reserved-ranges"
	 * the OTP configuration is set to OUT. (Other pins but HALL input pin
	 * on BD71828 can't really be used for general purpose input - input
	 * states are used for specific cases like regulator control or
	 * PMIC_ON_REQ.
	 */
	if (offset == HALL_GPIO_OFFSET)
		return GPIO_LINE_DIRECTION_IN;

	return GPIO_LINE_DIRECTION_OUT;
}

static int bd71828_probe(struct platform_device *pdev)
{
	struct bd71828_gpio *bdgpio;
	struct rohm_regmap_dev *bd71828;

	bd71828 = dev_get_drvdata(pdev->dev.parent);
	if (!bd71828) {
		dev_err(&pdev->dev, "No MFD driver data\n");
		return -EINVAL;
	}

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

	bdgpio->chip.dev = &pdev->dev;
	bdgpio->gpio.parent = pdev->dev.parent;
	bdgpio->gpio.label = "bd71828-gpio";
	bdgpio->gpio.owner = THIS_MODULE;
	bdgpio->gpio.get_direction = bd71828_get_direction;
	bdgpio->gpio.set_config = bd71828_gpio_set_config;
	bdgpio->gpio.can_sleep = true;
	bdgpio->gpio.get = bd71828_gpio_get;
	bdgpio->gpio.set = bd71828_gpio_set;
	bdgpio->gpio.base = -1;

	/*
	 * See if we need some implementation to mark some PINs as
	 * not controllable based on DT info or if core can handle
	 * "gpio-reserved-ranges" and exclude them from control
	 */
	bdgpio->gpio.ngpio = 4;
	bdgpio->gpio.of_node = pdev->dev.parent->of_node;
	bdgpio->chip.regmap = bd71828->regmap;

	return devm_gpiochip_add_data(&pdev->dev, &bdgpio->gpio,
				     bdgpio);
}

static struct platform_driver bd71828_gpio = {
	.driver = {
		.name = "bd71828-gpio"
	},
	.probe = bd71828_probe,
};

module_platform_driver(bd71828_gpio);

MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
MODULE_DESCRIPTION("BD71828 voltage regulator driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:bd71828-gpio");
Commit	Line	Data
c31f625d MV	1	// SPDX-License-Identifier: GPL-2.0-only
	2	// Copyright (C) 2018 ROHM Semiconductors
	3
	4	#include <linux/gpio/driver.h>
	5	#include <linux/mfd/rohm-bd71828.h>
	6	#include <linux/module.h>
	7	#include <linux/platform_device.h>
	8	#include <linux/regmap.h>
	9
	10	#define GPIO_OUT_REG(off) (BD71828_REG_GPIO_CTRL1 + (off))
	11	#define HALL_GPIO_OFFSET 3
	12
c31f625d MV	13	struct bd71828_gpio {
	14	struct rohm_regmap_dev chip;
	15	struct gpio_chip gpio;
	16	};
	17
	18	static void bd71828_gpio_set(struct gpio_chip *chip, unsigned int offset,
	19	int value)
	20	{
	21	int ret;
	22	struct bd71828_gpio *bdgpio = gpiochip_get_data(chip);
	23	u8 val = (value) ? BD71828_GPIO_OUT_HI : BD71828_GPIO_OUT_LO;
	24
	25	/*
	26	* The HALL input pin can only be used as input. If this is the pin
	27	* we are dealing with - then we are done
	28	*/
	29	if (offset == HALL_GPIO_OFFSET)
	30	return;
	31
	32	ret = regmap_update_bits(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
	33	BD71828_GPIO_OUT_MASK, val);
	34	if (ret)
	35	dev_err(bdgpio->chip.dev, "Could not set gpio to %d\n", value);
	36	}
	37
	38	static int bd71828_gpio_get(struct gpio_chip *chip, unsigned int offset)
	39	{
	40	int ret;
	41	unsigned int val;
	42	struct bd71828_gpio *bdgpio = gpiochip_get_data(chip);
	43
	44	if (offset == HALL_GPIO_OFFSET)
	45	ret = regmap_read(bdgpio->chip.regmap, BD71828_REG_IO_STAT,
	46	&val);
	47	else
	48	ret = regmap_read(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
	49	&val);
	50	if (!ret)
	51	ret = (val & BD71828_GPIO_OUT_MASK);
	52
	53	return ret;
	54	}
	55
	56	static int bd71828_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
	57	unsigned long config)
	58	{
	59	struct bd71828_gpio *bdgpio = gpiochip_get_data(chip);
	60
	61	if (offset == HALL_GPIO_OFFSET)
	62	return -ENOTSUPP;
	63
	64	switch (pinconf_to_config_param(config)) {
	65	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
	66	return regmap_update_bits(bdgpio->chip.regmap,
	67	GPIO_OUT_REG(offset),
	68	BD71828_GPIO_DRIVE_MASK,
	69	BD71828_GPIO_OPEN_DRAIN);
	70	case PIN_CONFIG_DRIVE_PUSH_PULL:
	71	return regmap_update_bits(bdgpio->chip.regmap,
	72	GPIO_OUT_REG(offset),
	73	BD71828_GPIO_DRIVE_MASK,
	74	BD71828_GPIO_PUSH_PULL);
	75	default:
	76	break;
77	}
78	return -ENOTSUPP;
79	}
80
81	static int bd71828_get_direction(struct gpio_chip *chip, unsigned int offset)
82	{
83	/*
84	* Pin usage is selected by OTP data. We can't read it runtime. Hence
85	* we trust that if the pin is not excluded by "gpio-reserved-ranges"
86	* the OTP configuration is set to OUT. (Other pins but HALL input pin
87	* on BD71828 can't really be used for general purpose input - input
88	* states are used for specific cases like regulator control or
89	* PMIC_ON_REQ.
90	*/
91	if (offset == HALL_GPIO_OFFSET)
92	return GPIO_LINE_DIRECTION_IN;
93
94	return GPIO_LINE_DIRECTION_OUT;
95	}
96
97	static int bd71828_probe(struct platform_device *pdev)
98	{
99	struct bd71828_gpio *bdgpio;
100	struct rohm_regmap_dev *bd71828;
101
102	bd71828 = dev_get_drvdata(pdev->dev.parent);
103	if (!bd71828) {
104	dev_err(&pdev->dev, "No MFD driver data\n");
105	return -EINVAL;
106	}
107
108	bdgpio = devm_kzalloc(&pdev->dev, sizeof(*bdgpio),
109	GFP_KERNEL);
110	if (!bdgpio)
111	return -ENOMEM;
112
113	bdgpio->chip.dev = &pdev->dev;
114	bdgpio->gpio.parent = pdev->dev.parent;
115	bdgpio->gpio.label = "bd71828-gpio";
116	bdgpio->gpio.owner = THIS_MODULE;
117	bdgpio->gpio.get_direction = bd71828_get_direction;
118	bdgpio->gpio.set_config = bd71828_gpio_set_config;
119	bdgpio->gpio.can_sleep = true;
120	bdgpio->gpio.get = bd71828_gpio_get;
121	bdgpio->gpio.set = bd71828_gpio_set;
122	bdgpio->gpio.base = -1;
123
124	/*
125	* See if we need some implementation to mark some PINs as
126	* not controllable based on DT info or if core can handle
127	* "gpio-reserved-ranges" and exclude them from control
128	*/
129	bdgpio->gpio.ngpio = 4;
130	bdgpio->gpio.of_node = pdev->dev.parent->of_node;
131	bdgpio->chip.regmap = bd71828->regmap;
132
133	return devm_gpiochip_add_data(&pdev->dev, &bdgpio->gpio,
134	bdgpio);
135	}
136
137	static struct platform_driver bd71828_gpio = {
138	.driver = {
139	.name = "bd71828-gpio"
140	},
141	.probe = bd71828_probe,
142	};
143
144	module_platform_driver(bd71828_gpio);
145
146	MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
147	MODULE_DESCRIPTION("BD71828 voltage regulator driver");
148	MODULE_LICENSE("GPL");
149	MODULE_ALIAS("platform:bd71828-gpio");