2 * Copyright (C) 2016 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 TPS65218 driver
17 #include <linux/gpio.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/regmap.h>
22 #include <linux/mfd/lp873x.h>
24 #define BITS_PER_GPO 0x4
25 #define LP873X_GPO_CTRL_OD 0x2
28 struct gpio_chip chip;
32 static int lp873x_gpio_get_direction(struct gpio_chip *chip,
35 /* This device is output only */
39 static int lp873x_gpio_direction_input(struct gpio_chip *chip,
42 /* This device is output only */
46 static int lp873x_gpio_direction_output(struct gpio_chip *chip,
47 unsigned int offset, int value)
49 struct lp873x_gpio *gpio = gpiochip_get_data(chip);
51 /* Set the initial value */
52 return regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL,
53 BIT(offset * BITS_PER_GPO),
54 value ? BIT(offset * BITS_PER_GPO) : 0);
57 static int lp873x_gpio_get(struct gpio_chip *chip, unsigned int offset)
59 struct lp873x_gpio *gpio = gpiochip_get_data(chip);
62 ret = regmap_read(gpio->lp873->regmap, LP873X_REG_GPO_CTRL, &val);
66 return val & BIT(offset * BITS_PER_GPO);
69 static void lp873x_gpio_set(struct gpio_chip *chip, unsigned int offset,
72 struct lp873x_gpio *gpio = gpiochip_get_data(chip);
74 regmap_update_bits(gpio->lp873->regmap, LP873X_REG_GPO_CTRL,
75 BIT(offset * BITS_PER_GPO),
76 value ? BIT(offset * BITS_PER_GPO) : 0);
79 static int lp873x_gpio_request(struct gpio_chip *gc, unsigned int offset)
81 struct lp873x_gpio *gpio = gpiochip_get_data(gc);
86 /* No MUX Set up Needed for GPO */
89 /* Setup the CLKIN_PIN_SEL MUX to GPO2 */
90 ret = regmap_update_bits(gpio->lp873->regmap, LP873X_REG_CONFIG,
91 LP873X_CONFIG_CLKIN_PIN_SEL, 0);
103 static int lp873x_gpio_set_config(struct gpio_chip *gc, unsigned offset,
104 unsigned long config)
106 struct lp873x_gpio *gpio = gpiochip_get_data(gc);
108 switch (pinconf_to_config_param(config)) {
109 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
110 return regmap_update_bits(gpio->lp873->regmap,
112 BIT(offset * BITS_PER_GPO +
114 BIT(offset * BITS_PER_GPO +
115 LP873X_GPO_CTRL_OD));
117 case PIN_CONFIG_DRIVE_PUSH_PULL:
118 return regmap_update_bits(gpio->lp873->regmap,
120 BIT(offset * BITS_PER_GPO +
121 LP873X_GPO_CTRL_OD), 0);
127 static const struct gpio_chip template_chip = {
128 .label = "lp873x-gpio",
129 .owner = THIS_MODULE,
130 .request = lp873x_gpio_request,
131 .get_direction = lp873x_gpio_get_direction,
132 .direction_input = lp873x_gpio_direction_input,
133 .direction_output = lp873x_gpio_direction_output,
134 .get = lp873x_gpio_get,
135 .set = lp873x_gpio_set,
136 .set_config = lp873x_gpio_set_config,
142 static int lp873x_gpio_probe(struct platform_device *pdev)
144 struct lp873x_gpio *gpio;
147 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
151 platform_set_drvdata(pdev, gpio);
153 gpio->lp873 = dev_get_drvdata(pdev->dev.parent);
154 gpio->chip = template_chip;
155 gpio->chip.parent = gpio->lp873->dev;
157 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
159 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
166 static const struct platform_device_id lp873x_gpio_id_table[] = {
170 MODULE_DEVICE_TABLE(platform, lp873x_gpio_id_table);
172 static struct platform_driver lp873x_gpio_driver = {
174 .name = "lp873x-gpio",
176 .probe = lp873x_gpio_probe,
177 .id_table = lp873x_gpio_id_table,
179 module_platform_driver(lp873x_gpio_driver);
181 MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
182 MODULE_DESCRIPTION("LP873X GPIO driver");
183 MODULE_LICENSE("GPL v2");