1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
  4 *	Andrew F. Davis <afd@ti.com>
  5 *
  6 * Based on the TPS65912 driver
  7 */
  8
  9#include <linux/gpio/driver.h>
 10#include <linux/module.h>
 11#include <linux/platform_device.h>
 12
 13#include <linux/mfd/tps65086.h>
 14
 15struct tps65086_gpio {
 16	struct gpio_chip chip;
 17	struct tps65086 *tps;
 18};
 19
 20static int tps65086_gpio_get_direction(struct gpio_chip *chip,
 21				       unsigned offset)
 22{
 23	/* This device is output only */
 24	return GPIO_LINE_DIRECTION_OUT;
 25}
 26
 27static int tps65086_gpio_direction_input(struct gpio_chip *chip,
 28					 unsigned offset)
 29{
 30	/* This device is output only */
 31	return -EINVAL;
 32}
 33
 34static int tps65086_gpio_direction_output(struct gpio_chip *chip,
 35					  unsigned offset, int value)
 36{
 37	struct tps65086_gpio *gpio = gpiochip_get_data(chip);
 38
 39	/* Set the initial value */
 40	regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
 41			   BIT(4 + offset), value ? BIT(4 + offset) : 0);
 42
 43	return 0;
 44}
 45
 46static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset)
 47{
 48	struct tps65086_gpio *gpio = gpiochip_get_data(chip);
 49	int ret, val;
 50
 51	ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val);
 52	if (ret < 0)
 53		return ret;
 54
 55	return val & BIT(4 + offset);
 56}
 57
 58static void tps65086_gpio_set(struct gpio_chip *chip, unsigned offset,
 59			      int value)
 60{
 61	struct tps65086_gpio *gpio = gpiochip_get_data(chip);
 62
 63	regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
 64			   BIT(4 + offset), value ? BIT(4 + offset) : 0);
 65}
 66
 67static const struct gpio_chip template_chip = {
 68	.label			= "tps65086-gpio",
 69	.owner			= THIS_MODULE,
 70	.get_direction		= tps65086_gpio_get_direction,
 71	.direction_input	= tps65086_gpio_direction_input,
 72	.direction_output	= tps65086_gpio_direction_output,
 73	.get			= tps65086_gpio_get,
 74	.set			= tps65086_gpio_set,
 75	.base			= -1,
 76	.ngpio			= 4,
 77	.can_sleep		= true,
 78};
 79
 80static int tps65086_gpio_probe(struct platform_device *pdev)
 81{
 82	struct tps65086_gpio *gpio;
 83	int ret;
 84
 85	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
 86	if (!gpio)
 87		return -ENOMEM;
 88
 89	platform_set_drvdata(pdev, gpio);
 90
 91	gpio->tps = dev_get_drvdata(pdev->dev.parent);
 92	gpio->chip = template_chip;
 93	gpio->chip.parent = gpio->tps->dev;
 94
 95	ret = gpiochip_add_data(&gpio->chip, gpio);
 96	if (ret < 0) {
 97		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
 98		return ret;
 99	}
100
101	return 0;
102}
103
104static int tps65086_gpio_remove(struct platform_device *pdev)
105{
106	struct tps65086_gpio *gpio = platform_get_drvdata(pdev);
107
108	gpiochip_remove(&gpio->chip);
109
110	return 0;
111}
112
113static const struct platform_device_id tps65086_gpio_id_table[] = {
114	{ "tps65086-gpio", },
115	{ /* sentinel */ }
116};
117MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table);
118
119static struct platform_driver tps65086_gpio_driver = {
120	.driver = {
121		.name = "tps65086-gpio",
122	},
123	.probe = tps65086_gpio_probe,
124	.remove = tps65086_gpio_remove,
125	.id_table = tps65086_gpio_id_table,
126};
127module_platform_driver(tps65086_gpio_driver);
128
129MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
130MODULE_DESCRIPTION("TPS65086 GPIO driver");
131MODULE_LICENSE("GPL v2");