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(struct gpio_chip *chip, unsigned int offset)
31 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
34 ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
38 return !!(val & BIT(offset));
41 static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
44 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
46 regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
47 BIT(offset), value ? BIT(offset) : 0);
50 static int lp87565_gpio_get_direction(struct gpio_chip *chip,
53 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
56 ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
60 if (val & BIT(offset))
61 return GPIO_LINE_DIRECTION_OUT;
63 return GPIO_LINE_DIRECTION_IN;
66 static int lp87565_gpio_direction_input(struct gpio_chip *chip,
69 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
71 return regmap_update_bits(gpio->map,
72 LP87565_REG_GPIO_CONFIG,
76 static int lp87565_gpio_direction_output(struct gpio_chip *chip,
77 unsigned int offset, int value)
79 struct lp87565_gpio *gpio = gpiochip_get_data(chip);
81 lp87565_gpio_set(chip, offset, value);
83 return regmap_update_bits(gpio->map,
84 LP87565_REG_GPIO_CONFIG,
85 BIT(offset), BIT(offset));
88 static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
90 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
98 * MUX can program the pin to be in EN1/2/3 pin mode
100 * Setup the GPIO*_SEL MUX to GPIO mode
102 ret = regmap_update_bits(gpio->map,
103 LP87565_REG_PIN_FUNCTION,
104 BIT(offset), BIT(offset));
116 static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
117 unsigned long config)
119 struct lp87565_gpio *gpio = gpiochip_get_data(gc);
121 switch (pinconf_to_config_param(config)) {
122 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
123 return regmap_update_bits(gpio->map,
124 LP87565_REG_GPIO_CONFIG,
126 __ffs(LP87565_GPIO1_OD)),
128 __ffs(LP87565_GPIO1_OD)));
129 case PIN_CONFIG_DRIVE_PUSH_PULL:
130 return regmap_update_bits(gpio->map,
131 LP87565_REG_GPIO_CONFIG,
133 __ffs(LP87565_GPIO1_OD)), 0);
139 static const struct gpio_chip template_chip = {
140 .label = "lp87565-gpio",
141 .owner = THIS_MODULE,
142 .request = lp87565_gpio_request,
143 .get_direction = lp87565_gpio_get_direction,
144 .direction_input = lp87565_gpio_direction_input,
145 .direction_output = lp87565_gpio_direction_output,
146 .get = lp87565_gpio_get,
147 .set = lp87565_gpio_set,
148 .set_config = lp87565_gpio_set_config,
154 static int lp87565_gpio_probe(struct platform_device *pdev)
156 struct lp87565_gpio *gpio;
157 struct lp87565 *lp87565;
160 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
164 lp87565 = dev_get_drvdata(pdev->dev.parent);
165 gpio->chip = template_chip;
166 gpio->chip.parent = lp87565->dev;
167 gpio->map = lp87565->regmap;
169 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
171 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
178 static const struct platform_device_id lp87565_gpio_id_table[] = {
179 { "lp87565-q1-gpio", },
182 MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
184 static struct platform_driver lp87565_gpio_driver = {
186 .name = "lp87565-gpio",
188 .probe = lp87565_gpio_probe,
189 .id_table = lp87565_gpio_id_table,
191 module_platform_driver(lp87565_gpio_driver);
193 MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
194 MODULE_DESCRIPTION("LP87565 GPIO driver");
195 MODULE_LICENSE("GPL v2");