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/drivers/gpio/gpio-tps65912.c

http://github.com/mirrors/linux
C | 141 lines | 102 code | 28 blank | 11 comment | 6 complexity | 8db38da0dc9012adb8eef074fbe07b7e MD5 | raw file
  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
 53	/* Set the initial value */
 54	regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
 55			   GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
 56
 57	return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
 58				  GPIO_CFG_MASK, GPIO_CFG_MASK);
 59}
 60
 61static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
 62{
 63	struct tps65912_gpio *gpio = gpiochip_get_data(gc);
 64	int ret, val;
 65
 66	ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
 67	if (ret)
 68		return ret;
 69
 70	if (val & GPIO_STS_MASK)
 71		return 1;
 72
 73	return 0;
 74}
 75
 76static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset,
 77			      int value)
 78{
 79	struct tps65912_gpio *gpio = gpiochip_get_data(gc);
 80
 81	regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
 82			   GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
 83}
 84
 85static const struct gpio_chip template_chip = {
 86	.label			= "tps65912-gpio",
 87	.owner			= THIS_MODULE,
 88	.get_direction		= tps65912_gpio_get_direction,
 89	.direction_input	= tps65912_gpio_direction_input,
 90	.direction_output	= tps65912_gpio_direction_output,
 91	.get			= tps65912_gpio_get,
 92	.set			= tps65912_gpio_set,
 93	.base			= -1,
 94	.ngpio			= 5,
 95	.can_sleep		= true,
 96};
 97
 98static int tps65912_gpio_probe(struct platform_device *pdev)
 99{
100	struct tps65912 *tps = dev_get_drvdata(pdev->dev.parent);
101	struct tps65912_gpio *gpio;
102	int ret;
103
104	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
105	if (!gpio)
106		return -ENOMEM;
107
108	gpio->tps = dev_get_drvdata(pdev->dev.parent);
109	gpio->gpio_chip = template_chip;
110	gpio->gpio_chip.parent = tps->dev;
111
112	ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gpio_chip,
113				     gpio);
114	if (ret < 0) {
115		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
116		return ret;
117	}
118
119	platform_set_drvdata(pdev, gpio);
120
121	return 0;
122}
123
124static const struct platform_device_id tps65912_gpio_id_table[] = {
125	{ "tps65912-gpio", },
126	{ /* sentinel */ }
127};
128MODULE_DEVICE_TABLE(platform, tps65912_gpio_id_table);
129
130static struct platform_driver tps65912_gpio_driver = {
131	.driver = {
132		.name = "tps65912-gpio",
133	},
134	.probe = tps65912_gpio_probe,
135	.id_table = tps65912_gpio_id_table,
136};
137module_platform_driver(tps65912_gpio_driver);
138
139MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
140MODULE_DESCRIPTION("TPS65912 GPIO driver");
141MODULE_LICENSE("GPL v2");