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	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
84	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
85	if (!gpio)
86		return -ENOMEM;
87
88	gpio->tps = dev_get_drvdata(pdev->dev.parent);
89	gpio->chip = template_chip;
90	gpio->chip.parent = gpio->tps->dev;
91
92	return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
93}
94
95static const struct platform_device_id tps65086_gpio_id_table[] = {
96	{ "tps65086-gpio", },
97	{ /* sentinel */ }
98};
99MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table);
100
101static struct platform_driver tps65086_gpio_driver = {
102	.driver = {
103		.name = "tps65086-gpio",
104	},
105	.probe = tps65086_gpio_probe,
106	.id_table = tps65086_gpio_id_table,
107};
108module_platform_driver(tps65086_gpio_driver);
109
110MODULE_AUTHOR("Andrew Davis <afd@ti.com>");
111MODULE_DESCRIPTION("TPS65086 GPIO driver");
112MODULE_LICENSE("GPL v2");
113