gpio-tps65086.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 2015-2023 Texas Instruments Incorporated - https://www.ti.com/
  4 *	Andrew 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	return regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
 41				  BIT(4 + offset), value ? BIT(4 + offset) : 0);
 42}
 43
 44static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset)
 45{
 46	struct tps65086_gpio *gpio = gpiochip_get_data(chip);
 47	int ret, val;
 48
 49	ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val);
 50	if (ret < 0)
 51		return ret;
 52
 53	return val & BIT(4 + offset);
 54}
 55
 56static int tps65086_gpio_set(struct gpio_chip *chip, unsigned int offset,
 57			     int value)
 58{
 59	struct tps65086_gpio *gpio = gpiochip_get_data(chip);
 60
 61	return regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
 62				  BIT(4 + offset), value ? BIT(4 + offset) : 0);
 63}
 64
 65static const struct gpio_chip template_chip = {
 66	.label			= "tps65086-gpio",
 67	.owner			= THIS_MODULE,
 68	.get_direction		= tps65086_gpio_get_direction,
 69	.direction_input	= tps65086_gpio_direction_input,
 70	.direction_output	= tps65086_gpio_direction_output,
 71	.get			= tps65086_gpio_get,
 72	.set			= tps65086_gpio_set,
 73	.base			= -1,
 74	.ngpio			= 4,
 75	.can_sleep		= true,
 76};
 77
 78static int tps65086_gpio_probe(struct platform_device *pdev)
 79{
 80	struct tps65086_gpio *gpio;
 81
 82	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
 83	if (!gpio)
 84		return -ENOMEM;
 85
 86	gpio->tps = dev_get_drvdata(pdev->dev.parent);
 87	gpio->chip = template_chip;
 88	gpio->chip.parent = gpio->tps->dev;
 89
 90	return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
 91}
 92
 93static const struct platform_device_id tps65086_gpio_id_table[] = {
 94	{ "tps65086-gpio", },
 95	{ /* sentinel */ }
 96};
 97MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table);
 98
 99static struct platform_driver tps65086_gpio_driver = {
100	.driver = {
101		.name = "tps65086-gpio",
102	},
103	.probe = tps65086_gpio_probe,
104	.id_table = tps65086_gpio_id_table,
105};
106module_platform_driver(tps65086_gpio_driver);
107
108MODULE_AUTHOR("Andrew Davis <afd@ti.com>");
109MODULE_DESCRIPTION("TPS65086 GPIO driver");
110MODULE_LICENSE("GPL v2");