2 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
3 * Keerthy <j-keerthy@ti.com>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
10 * kind, whether expressed or implied; without even the implied warranty
11 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License version 2 for more details.
14 * Based on the LP873X driver
17 #include <linux/gpio/driver.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/regmap.h>
22 #include <linux/mfd/lp87565.h>
25 struct gpio_chip chip;
29 static int lp87565_gpio_get_direction(struct gpio_chip *chip,
32 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
35 ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
39 return !(val & BIT(offset));
42 static int lp87565_gpio_direction_input(struct gpio_chip *chip,
45 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
47 return regmap_update_bits(gpio->map,
48 LP87565_REG_GPIO_CONFIG,
52 static int lp87565_gpio_direction_output(struct gpio_chip *chip,
53 unsigned int offset, int value)
55 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
57 return regmap_update_bits(gpio->map,
58 LP87565_REG_GPIO_CONFIG,
59 BIT(offset), !value ? BIT(offset) : 0);
62 static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
64 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
67 ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
71 return !!(val & BIT(offset));
74 static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
77 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
79 regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
80 BIT(offset), value ? BIT(offset) : 0);
83 static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
85 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
93 * MUX can program the pin to be in EN1/2/3 pin mode
95 * Setup the GPIO*_SEL MUX to GPIO mode
97 ret = regmap_update_bits(gpio->map,
98 LP87565_REG_PIN_FUNCTION,
99 BIT(offset), BIT(offset));
111 static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
112 unsigned long config)
114 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
116 switch (pinconf_to_config_param(config)) {
117 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
118 return regmap_update_bits(gpio->map,
119 LP87565_REG_GPIO_CONFIG,
121 __ffs(LP87565_GOIO1_OD)),
123 __ffs(LP87565_GOIO1_OD)));
124 case PIN_CONFIG_DRIVE_PUSH_PULL:
125 return regmap_update_bits(gpio->map,
126 LP87565_REG_GPIO_CONFIG,
128 __ffs(LP87565_GOIO1_OD)), 0);
134 static const struct gpio_chip template_chip = {
135 .label = "lp87565-gpio",
136 .owner = THIS_MODULE,
137 .request = lp87565_gpio_request,
138 .get_direction = lp87565_gpio_get_direction,
139 .direction_input = lp87565_gpio_direction_input,
140 .direction_output = lp87565_gpio_direction_output,
141 .get = lp87565_gpio_get,
142 .set = lp87565_gpio_set,
143 .set_config = lp87565_gpio_set_config,
149 static int lp87565_gpio_probe(struct platform_device *pdev)
151 struct lp87565_gpio *gpio;
152 struct lp87565 *lp87565;
155 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
159 lp87565 = dev_get_drvdata(pdev->dev.parent);
160 gpio->chip = template_chip;
161 gpio->chip.parent = lp87565->dev;
162 gpio->map = lp87565->regmap;
164 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
166 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
173 static const struct platform_device_id lp87565_gpio_id_table[] = {
174 { "lp87565-q1-gpio", },
177 MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
179 static struct platform_driver lp87565_gpio_driver = {
181 .name = "lp87565-gpio",
183 .probe = lp87565_gpio_probe,
184 .id_table = lp87565_gpio_id_table,
186 module_platform_driver(lp87565_gpio_driver);
188 MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
189 MODULE_DESCRIPTION("LP87565 GPIO driver");
190 MODULE_LICENSE("GPL v2");