1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * ROHM BD9571MWV-M and BD9574MWF-M GPIO driver
4 *
5 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
6 *
7 * Based on the TPS65086 driver
8 *
9 * NOTE: Interrupts are not supported yet.
10 */
11
12#include <linux/gpio/driver.h>
13#include <linux/mfd/rohm-generic.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16
17#include <linux/mfd/bd9571mwv.h>
18
19struct bd9571mwv_gpio {
20	struct regmap *regmap;
21	struct gpio_chip chip;
22};
23
24static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
25				       unsigned int offset)
26{
27	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
28	int ret, val;
29
30	ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_DIR, &val);
31	if (ret < 0)
32		return ret;
33	if (val & BIT(offset))
34		return GPIO_LINE_DIRECTION_IN;
35
36	return GPIO_LINE_DIRECTION_OUT;
37}
38
39static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
40					 unsigned int offset)
41{
42	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
43
44	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR, BIT(offset), 0);
45
46	return 0;
47}
48
49static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
50					  unsigned int offset, int value)
51{
52	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
53
54	/* Set the initial value */
55	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
56			   BIT(offset), value ? BIT(offset) : 0);
57	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR,
58			   BIT(offset), BIT(offset));
59
60	return 0;
61}
62
63static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
64{
65	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
66	int ret, val;
67
68	ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_IN, &val);
69	if (ret < 0)
70		return ret;
71
72	return val & BIT(offset);
73}
74
75static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
76			      int value)
77{
78	struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
79
80	regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
81			   BIT(offset), value ? BIT(offset) : 0);
82}
83
84static const struct gpio_chip template_chip = {
85	.label			= "bd9571mwv-gpio",
86	.owner			= THIS_MODULE,
87	.get_direction		= bd9571mwv_gpio_get_direction,
88	.direction_input	= bd9571mwv_gpio_direction_input,
89	.direction_output	= bd9571mwv_gpio_direction_output,
90	.get			= bd9571mwv_gpio_get,
91	.set			= bd9571mwv_gpio_set,
92	.base			= -1,
93	.ngpio			= 2,
94	.can_sleep		= true,
95};
96
97static int bd9571mwv_gpio_probe(struct platform_device *pdev)
98{
99	struct bd9571mwv_gpio *gpio;
100
101	gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
102	if (!gpio)
103		return -ENOMEM;
104
105	gpio->regmap = dev_get_regmap(pdev->dev.parent, NULL);
106	gpio->chip = template_chip;
107	gpio->chip.parent = pdev->dev.parent;
108
109	return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
110}
111
112static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
113	{ "bd9571mwv-gpio", ROHM_CHIP_TYPE_BD9571 },
114	{ "bd9574mwf-gpio", ROHM_CHIP_TYPE_BD9574 },
115	{ /* sentinel */ }
116};
117MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
118
119static struct platform_driver bd9571mwv_gpio_driver = {
120	.driver = {
121		.name = "bd9571mwv-gpio",
122	},
123	.probe = bd9571mwv_gpio_probe,
124	.id_table = bd9571mwv_gpio_id_table,
125};
126module_platform_driver(bd9571mwv_gpio_driver);
127
128MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
129MODULE_DESCRIPTION("BD9571MWV GPIO driver");
130MODULE_LICENSE("GPL v2");
131