1/*
2 * ROHM BD9571MWV-M GPIO driver
3 *
4 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11 * kind, whether expressed or implied; without even the implied warranty
12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License version 2 for more details.
14 *
15 * Based on the TPS65086 driver
16 *
17 * NOTE: Interrupts are not supported yet.
18 */
19
20#include <linux/gpio/driver.h>
21#include <linux/module.h>
22#include <linux/platform_device.h>
23
24#include <linux/mfd/bd9571mwv.h>
25
26struct bd9571mwv_gpio {
27 struct gpio_chip chip;
28 struct bd9571mwv *bd;
29};
30
31static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
32 unsigned int offset)
33{
34 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
35 int ret, val;
36
37 ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_DIR, &val);
38 if (ret < 0)
39 return ret;
40
41 return val & BIT(offset);
42}
43
44static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
45 unsigned int offset)
46{
47 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
48
49 regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
50 BIT(offset), 0);
51
52 return 0;
53}
54
55static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
56 unsigned int offset, int value)
57{
58 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
59
60 /* Set the initial value */
61 regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
62 BIT(offset), value ? BIT(offset) : 0);
63 regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
64 BIT(offset), BIT(offset));
65
66 return 0;
67}
68
69static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
70{
71 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
72 int ret, val;
73
74 ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_IN, &val);
75 if (ret < 0)
76 return ret;
77
78 return val & BIT(offset);
79}
80
81static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
82 int value)
83{
84 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
85
86 regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
87 BIT(offset), value ? BIT(offset) : 0);
88}
89
90static const struct gpio_chip template_chip = {
91 .label = "bd9571mwv-gpio",
92 .owner = THIS_MODULE,
93 .get_direction = bd9571mwv_gpio_get_direction,
94 .direction_input = bd9571mwv_gpio_direction_input,
95 .direction_output = bd9571mwv_gpio_direction_output,
96 .get = bd9571mwv_gpio_get,
97 .set = bd9571mwv_gpio_set,
98 .base = -1,
99 .ngpio = 2,
100 .can_sleep = true,
101};
102
103static int bd9571mwv_gpio_probe(struct platform_device *pdev)
104{
105 struct bd9571mwv_gpio *gpio;
106 int ret;
107
108 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
109 if (!gpio)
110 return -ENOMEM;
111
112 platform_set_drvdata(pdev, gpio);
113
114 gpio->bd = dev_get_drvdata(pdev->dev.parent);
115 gpio->chip = template_chip;
116 gpio->chip.parent = gpio->bd->dev;
117
118 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
119 if (ret < 0) {
120 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
121 return ret;
122 }
123
124 return 0;
125}
126
127static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
128 { "bd9571mwv-gpio", },
129 { /* sentinel */ }
130};
131MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
132
133static struct platform_driver bd9571mwv_gpio_driver = {
134 .driver = {
135 .name = "bd9571mwv-gpio",
136 },
137 .probe = bd9571mwv_gpio_probe,
138 .id_table = bd9571mwv_gpio_id_table,
139};
140module_platform_driver(bd9571mwv_gpio_driver);
141
142MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
143MODULE_DESCRIPTION("BD9571MWV GPIO driver");
144MODULE_LICENSE("GPL v2");
145