1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
4 * Keerthy <j-keerthy@ti.com>
6 * Based on the LP873X driver
9 #include <linux/gpio/driver.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/regmap.h>
14 #include <linux/mfd/lp87565.h>
17 struct gpio_chip chip;
21 static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
23 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
26 ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
30 return !!(val & BIT(offset));
33 static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
36 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
38 regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
39 BIT(offset), value ? BIT(offset) : 0);
42 static int lp87565_gpio_get_direction(struct gpio_chip *chip,
45 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
48 ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
52 if (val & BIT(offset))
53 return GPIO_LINE_DIRECTION_OUT;
55 return GPIO_LINE_DIRECTION_IN;
58 static int lp87565_gpio_direction_input(struct gpio_chip *chip,
61 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
63 return regmap_update_bits(gpio->map,
64 LP87565_REG_GPIO_CONFIG,
68 static int lp87565_gpio_direction_output(struct gpio_chip *chip,
69 unsigned int offset, int value)
71 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
73 lp87565_gpio_set(chip, offset, value);
75 return regmap_update_bits(gpio->map,
76 LP87565_REG_GPIO_CONFIG,
77 BIT(offset), BIT(offset));
80 static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
82 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
90 * MUX can program the pin to be in EN1/2/3 pin mode
92 * Setup the GPIO*_SEL MUX to GPIO mode
94 ret = regmap_update_bits(gpio->map,
95 LP87565_REG_PIN_FUNCTION,
96 BIT(offset), BIT(offset));
108 static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
109 unsigned long config)
111 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
113 switch (pinconf_to_config_param(config)) {
114 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
115 return regmap_update_bits(gpio->map,
116 LP87565_REG_GPIO_CONFIG,
118 __ffs(LP87565_GPIO1_OD)),
120 __ffs(LP87565_GPIO1_OD)));
121 case PIN_CONFIG_DRIVE_PUSH_PULL:
122 return regmap_update_bits(gpio->map,
123 LP87565_REG_GPIO_CONFIG,
125 __ffs(LP87565_GPIO1_OD)), 0);
131 static const struct gpio_chip template_chip = {
132 .label = "lp87565-gpio",
133 .owner = THIS_MODULE,
134 .request = lp87565_gpio_request,
135 .get_direction = lp87565_gpio_get_direction,
136 .direction_input = lp87565_gpio_direction_input,
137 .direction_output = lp87565_gpio_direction_output,
138 .get = lp87565_gpio_get,
139 .set = lp87565_gpio_set,
140 .set_config = lp87565_gpio_set_config,
146 static int lp87565_gpio_probe(struct platform_device *pdev)
148 struct lp87565_gpio *gpio;
149 struct lp87565 *lp87565;
152 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
156 lp87565 = dev_get_drvdata(pdev->dev.parent);
157 gpio->chip = template_chip;
158 gpio->chip.parent = lp87565->dev;
159 gpio->map = lp87565->regmap;
161 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
163 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
170 static const struct platform_device_id lp87565_gpio_id_table[] = {
171 { "lp87565-q1-gpio", },
174 MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
176 static struct platform_driver lp87565_gpio_driver = {
178 .name = "lp87565-gpio",
180 .probe = lp87565_gpio_probe,
181 .id_table = lp87565_gpio_id_table,
183 module_platform_driver(lp87565_gpio_driver);
185 MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
186 MODULE_DESCRIPTION("LP87565 GPIO driver");
187 MODULE_LICENSE("GPL v2");