[linux-2.6-block.git] / drivers / gpio / gpio-lp87565.c

/*
 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
 *	Keerthy <j-keerthy@ti.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 LP873X driver
 */

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

#include <linux/mfd/lp87565.h>

struct lp87565_gpio {
	struct gpio_chip chip;
	struct regmap *map;
};

static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
	int ret, val;

	ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
	if (ret < 0)
		return ret;

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

static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
			     int value)
{
	struct lp87565_gpio *gpio = gpiochip_get_data(chip);

	regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
			   BIT(offset), value ? BIT(offset) : 0);
}

static int lp87565_gpio_get_direction(struct gpio_chip *chip,
				      unsigned int offset)
{
	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
	int ret, val;

	ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
	if (ret < 0)
		return ret;

	if (val & BIT(offset))
		return GPIO_LINE_DIRECTION_OUT;

	return GPIO_LINE_DIRECTION_IN;
}

static int lp87565_gpio_direction_input(struct gpio_chip *chip,
					unsigned int offset)
{
	struct lp87565_gpio *gpio = gpiochip_get_data(chip);

	return regmap_update_bits(gpio->map,
				  LP87565_REG_GPIO_CONFIG,
				  BIT(offset), 0);
}

static int lp87565_gpio_direction_output(struct gpio_chip *chip,
					 unsigned int offset, int value)
{
	struct lp87565_gpio *gpio = gpiochip_get_data(chip);

	lp87565_gpio_set(chip, offset, value);

	return regmap_update_bits(gpio->map,
				  LP87565_REG_GPIO_CONFIG,
				  BIT(offset), BIT(offset));
}

static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
{
	struct lp87565_gpio *gpio = gpiochip_get_data(gc);
	int ret;

	switch (offset) {
	case 0:
	case 1:
	case 2:
		/*
		 * MUX can program the pin to be in EN1/2/3 pin mode
		 * Or GPIO1/2/3 mode.
		 * Setup the GPIO*_SEL MUX to GPIO mode
		 */
		ret = regmap_update_bits(gpio->map,
					 LP87565_REG_PIN_FUNCTION,
					 BIT(offset), BIT(offset));
		if (ret)
			return ret;

		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
				   unsigned long config)
{
	struct lp87565_gpio *gpio = gpiochip_get_data(gc);

	switch (pinconf_to_config_param(config)) {
	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
		return regmap_update_bits(gpio->map,
					  LP87565_REG_GPIO_CONFIG,
					  BIT(offset +
					      __ffs(LP87565_GOIO1_OD)),
					  BIT(offset +
					      __ffs(LP87565_GOIO1_OD)));
	case PIN_CONFIG_DRIVE_PUSH_PULL:
		return regmap_update_bits(gpio->map,
					  LP87565_REG_GPIO_CONFIG,
					  BIT(offset +
					      __ffs(LP87565_GOIO1_OD)), 0);
	default:
		return -ENOTSUPP;
	}
}

static const struct gpio_chip template_chip = {
	.label			= "lp87565-gpio",
	.owner			= THIS_MODULE,
	.request		= lp87565_gpio_request,
	.get_direction		= lp87565_gpio_get_direction,
	.direction_input	= lp87565_gpio_direction_input,
	.direction_output	= lp87565_gpio_direction_output,
	.get			= lp87565_gpio_get,
	.set			= lp87565_gpio_set,
	.set_config		= lp87565_gpio_set_config,
	.base			= -1,
	.ngpio			= 3,
	.can_sleep		= true,
};

static int lp87565_gpio_probe(struct platform_device *pdev)
{
	struct lp87565_gpio *gpio;
	struct lp87565 *lp87565;
	int ret;

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

	lp87565 = dev_get_drvdata(pdev->dev.parent);
	gpio->chip = template_chip;
	gpio->chip.parent = lp87565->dev;
	gpio->map = lp87565->regmap;

	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 lp87565_gpio_id_table[] = {
	{ "lp87565-q1-gpio", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);

static struct platform_driver lp87565_gpio_driver = {
	.driver = {
		.name = "lp87565-gpio",
	},
	.probe = lp87565_gpio_probe,
	.id_table = lp87565_gpio_id_table,
};
module_platform_driver(lp87565_gpio_driver);

MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
MODULE_DESCRIPTION("LP87565 GPIO driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
5c7f2c76 K	1	/*
	2	* Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
	3	* Keerthy <j-keerthy@ti.com>
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*
	9	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	10	* kind, whether expressed or implied; without even the implied warranty
	11	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License version 2 for more details.
	13	*
	14	* Based on the LP873X driver
	15	*/
	16
	17	#include <linux/gpio/driver.h>
	18	#include <linux/module.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/regmap.h>
	21
	22	#include <linux/mfd/lp87565.h>
	23
	24	struct lp87565_gpio {
	25	struct gpio_chip chip;
	26	struct regmap *map;
	27	};
	28
fa8f6d06 AL	29	static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
	30	{
	31	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
	32	int ret, val;
	33
	34	ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
	35	if (ret < 0)
	36	return ret;
	37
	38	return !!(val & BIT(offset));
	39	}
	40
	41	static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
	42	int value)
	43	{
	44	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
	45
	46	regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
	47	BIT(offset), value ? BIT(offset) : 0);
	48	}
	49
5c7f2c76 K	50	static int lp87565_gpio_get_direction(struct gpio_chip *chip,
	51	unsigned int offset)
	52	{
	53	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
	54	int ret, val;
	55
	56	ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
	57	if (ret < 0)
	58	return ret;
	59
e42615ec MV	60	if (val & BIT(offset))
	61	return GPIO_LINE_DIRECTION_OUT;
	62
	63	return GPIO_LINE_DIRECTION_IN;
5c7f2c76 K	64	}
	65
	66	static int lp87565_gpio_direction_input(struct gpio_chip *chip,
	67	unsigned int offset)
	68	{
	69	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
	70
	71	return regmap_update_bits(gpio->map,
	72	LP87565_REG_GPIO_CONFIG,
	73	BIT(offset), 0);
	74	}
	75
	76	static int lp87565_gpio_direction_output(struct gpio_chip *chip,
	77	unsigned int offset, int value)
	78	{
	79	struct lp87565_gpio *gpio = gpiochip_get_data(chip);
	80
fa8f6d06 AL	81	lp87565_gpio_set(chip, offset, value);
fa8f6d06 AL	82
5c7f2c76 K	83	return regmap_update_bits(gpio->map,
5c7f2c76 K	84	LP87565_REG_GPIO_CONFIG,
fa8f6d06	85	BIT(offset), BIT(offset));
5c7f2c76 K	86	}
	87
	88	static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
	89	{
	90	struct lp87565_gpio *gpio = gpiochip_get_data(gc);
	91	int ret;
	92
	93	switch (offset) {
	94	case 0:
	95	case 1:
	96	case 2:
	97	/*
	98	* MUX can program the pin to be in EN1/2/3 pin mode
	99	* Or GPIO1/2/3 mode.
	100	* Setup the GPIO*_SEL MUX to GPIO mode
	101	*/
	102	ret = regmap_update_bits(gpio->map,
	103	LP87565_REG_PIN_FUNCTION,
	104	BIT(offset), BIT(offset));
	105	if (ret)
	106	return ret;
	107
	108	break;
	109	default:
	110	return -EINVAL;
	111	}
	112
	113	return 0;
	114	}
	115
	116	static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
	117	unsigned long config)
	118	{
	119	struct lp87565_gpio *gpio = gpiochip_get_data(gc);
	120
	121	switch (pinconf_to_config_param(config)) {
	122	case PIN_CONFIG_DRIVE_OPEN_DRAIN:
	123	return regmap_update_bits(gpio->map,
	124	LP87565_REG_GPIO_CONFIG,
	125	BIT(offset +
	126	__ffs(LP87565_GOIO1_OD)),
	127	BIT(offset +
	128	__ffs(LP87565_GOIO1_OD)));
	129	case PIN_CONFIG_DRIVE_PUSH_PULL:
	130	return regmap_update_bits(gpio->map,
	131	LP87565_REG_GPIO_CONFIG,
	132	BIT(offset +
	133	__ffs(LP87565_GOIO1_OD)), 0);
	134	default:
	135	return -ENOTSUPP;
	136	}
	137	}
	138
	139	static const struct gpio_chip template_chip = {
	140	.label = "lp87565-gpio",
	141	.owner = THIS_MODULE,
	142	.request = lp87565_gpio_request,
	143	.get_direction = lp87565_gpio_get_direction,
	144	.direction_input = lp87565_gpio_direction_input,
	145	.direction_output = lp87565_gpio_direction_output,
	146	.get = lp87565_gpio_get,
	147	.set = lp87565_gpio_set,
	148	.set_config = lp87565_gpio_set_config,
	149	.base = -1,
150	.ngpio = 3,
151	.can_sleep = true,
152	};
153
154	static int lp87565_gpio_probe(struct platform_device *pdev)
155	{
156	struct lp87565_gpio *gpio;
157	struct lp87565 *lp87565;
158	int ret;
159
160	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
161	if (!gpio)
162	return -ENOMEM;
163
164	lp87565 = dev_get_drvdata(pdev->dev.parent);
165	gpio->chip = template_chip;
166	gpio->chip.parent = lp87565->dev;
167	gpio->map = lp87565->regmap;
168
169	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
170	if (ret < 0) {
171	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
172	return ret;
173	}
174
175	return 0;
176	}
177
178	static const struct platform_device_id lp87565_gpio_id_table[] = {
179	{ "lp87565-q1-gpio", },
180	{ /* sentinel */ }
181	};
182	MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
183
184	static struct platform_driver lp87565_gpio_driver = {
185	.driver = {
186	.name = "lp87565-gpio",
187	},
188	.probe = lp87565_gpio_probe,
189	.id_table = lp87565_gpio_id_table,
190	};
191	module_platform_driver(lp87565_gpio_driver);
192
193	MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
194	MODULE_DESCRIPTION("LP87565 GPIO driver");
195	MODULE_LICENSE("GPL v2");