gpio-tps65912.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * GPIO driver for TI TPS65912x PMICs
  4 *
  5 * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
  6 *	Andrew F. Davis <afd@ti.com>
  7 *
  8 * Based on the Arizona GPIO driver and the previous TPS65912 driver by
  9 * Margarita Olaya Cabrera <magi@slimlogic.co.uk>
 10 */
 11
 12#include <linux/gpio/driver.h>
 13#include <linux/module.h>
 14#include <linux/platform_device.h>
 15
 16#include <linux/mfd/tps65912.h>
 17
 18struct tps65912_gpio {
 19	struct gpio_chip gpio_chip;
 20	struct tps65912 *tps;
 21};
 22
 23static int tps65912_gpio_get_direction(struct gpio_chip *gc,
 24				       unsigned offset)
 25{
 26	struct tps65912_gpio *gpio = gpiochip_get_data(gc);
 27
 28	int ret, val;
 29
 30	ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
 31	if (ret)
 32		return ret;
 33
 34	if (val & GPIO_CFG_MASK)
 35		return GPIO_LINE_DIRECTION_OUT;
 36	else
 37		return GPIO_LINE_DIRECTION_IN;
 38}
 39
 40static int tps65912_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
 41{
 42	struct tps65912_gpio *gpio = gpiochip_get_data(gc);
 43
 44	return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
 45				  GPIO_CFG_MASK, 0);
 46}
 47
 48static int tps65912_gpio_direction_output(struct gpio_chip *gc,
 49					  unsigned offset, int value)
 50{
 51	struct tps65912_gpio *gpio = gpiochip_get_data(gc);
 52	int ret;
 53
 54	/* Set the initial value */
 55	ret = regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
 56				 GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
 57	if (ret)
 58		return ret;
 59
 60	return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
 61				  GPIO_CFG_MASK, GPIO_CFG_MASK);
 62}
 63
 64static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
 65{
 66	struct tps65912_gpio *gpio = gpiochip_get_data(gc);
 67	int ret, val;
 68
 69	ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
 70	if (ret)
 71		return ret;
 72
 73	if (val & GPIO_STS_MASK)
 74		return 1;
 75
 76	return 0;
 77}
 78
 79static int tps65912_gpio_set(struct gpio_chip *gc, unsigned int offset,
 80			     int value)
 81{
 82	struct tps65912_gpio *gpio = gpiochip_get_data(gc);
 83
 84	return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
 85				  GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
 86}
 87
 88static const struct gpio_chip template_chip = {
 89	.label			= "tps65912-gpio",
 90	.owner			= THIS_MODULE,
 91	.get_direction		= tps65912_gpio_get_direction,
 92	.direction_input	= tps65912_gpio_direction_input,
 93	.direction_output	= tps65912_gpio_direction_output,
 94	.get			= tps65912_gpio_get,
 95	.set			= tps65912_gpio_set,
 96	.base			= -1,
 97	.ngpio			= 5,
 98	.can_sleep		= true,
 99};
100
101static int tps65912_gpio_probe(struct platform_device *pdev)
102{
103	struct tps65912 *tps = dev_get_drvdata(pdev->dev.parent);
104	struct tps65912_gpio *gpio;
105
106	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
107	if (!gpio)
108		return -ENOMEM;
109
110	gpio->tps = dev_get_drvdata(pdev->dev.parent);
111	gpio->gpio_chip = template_chip;
112	gpio->gpio_chip.parent = tps->dev;
113
114	return devm_gpiochip_add_data(&pdev->dev, &gpio->gpio_chip, gpio);
115}
116
117static const struct platform_device_id tps65912_gpio_id_table[] = {
118	{ "tps65912-gpio", },
119	{ /* sentinel */ }
120};
121MODULE_DEVICE_TABLE(platform, tps65912_gpio_id_table);
122
123static struct platform_driver tps65912_gpio_driver = {
124	.driver = {
125		.name = "tps65912-gpio",
126	},
127	.probe = tps65912_gpio_probe,
128	.id_table = tps65912_gpio_id_table,
129};
130module_platform_driver(tps65912_gpio_driver);
131
132MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
133MODULE_DESCRIPTION("TPS65912 GPIO driver");
134MODULE_LICENSE("GPL v2");