1 // SPDX-License-Identifier: GPL-2.0-only
3 * ROHM BD9571MWV-M GPIO driver
5 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
7 * Based on the TPS65086 driver
9 * NOTE: Interrupts are not supported yet.
12 #include <linux/gpio/driver.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
16 #include <linux/mfd/bd9571mwv.h>
18 struct bd9571mwv_gpio {
19 struct gpio_chip chip;
23 static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
26 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
29 ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_DIR, &val);
32 if (val & BIT(offset))
33 return GPIO_LINE_DIRECTION_IN;
35 return GPIO_LINE_DIRECTION_OUT;
38 static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
41 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
43 regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
49 static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
50 unsigned int offset, int value)
52 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
54 /* Set the initial value */
55 regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
56 BIT(offset), value ? BIT(offset) : 0);
57 regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_DIR,
58 BIT(offset), BIT(offset));
63 static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
65 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
68 ret = regmap_read(gpio->bd->regmap, BD9571MWV_GPIO_IN, &val);
72 return val & BIT(offset);
75 static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
78 struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
80 regmap_update_bits(gpio->bd->regmap, BD9571MWV_GPIO_OUT,
81 BIT(offset), value ? BIT(offset) : 0);
84 static const struct gpio_chip template_chip = {
85 .label = "bd9571mwv-gpio",
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,
97 static int bd9571mwv_gpio_probe(struct platform_device *pdev)
99 struct bd9571mwv_gpio *gpio;
102 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
106 platform_set_drvdata(pdev, gpio);
108 gpio->bd = dev_get_drvdata(pdev->dev.parent);
109 gpio->chip = template_chip;
110 gpio->chip.parent = gpio->bd->dev;
112 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
114 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
121 static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
122 { "bd9571mwv-gpio", },
125 MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
127 static struct platform_driver bd9571mwv_gpio_driver = {
129 .name = "bd9571mwv-gpio",
131 .probe = bd9571mwv_gpio_probe,
132 .id_table = bd9571mwv_gpio_id_table,
134 module_platform_driver(bd9571mwv_gpio_driver);
136 MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
137 MODULE_DESCRIPTION("BD9571MWV GPIO driver");
138 MODULE_LICENSE("GPL v2");