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- // SPDX-License-Identifier: GPL-2.0
- // Copyright (c) 2019, Linaro Limited
- #include <linux/module.h>
- #include <linux/gpio/driver.h>
- #include <linux/regmap.h>
- #include <linux/slab.h>
- #include <linux/of_device.h>
- #define WCD_PIN_MASK(p) BIT(p)
- #define WCD_REG_DIR_CTL_OFFSET 0x42
- #define WCD_REG_VAL_CTL_OFFSET 0x43
- #define WCD934X_NPINS 5
- struct wcd_gpio_data {
- struct regmap *map;
- struct gpio_chip chip;
- };
- static int wcd_gpio_get_direction(struct gpio_chip *chip, unsigned int pin)
- {
- struct wcd_gpio_data *data = gpiochip_get_data(chip);
- unsigned int value;
- int ret;
- ret = regmap_read(data->map, WCD_REG_DIR_CTL_OFFSET, &value);
- if (ret < 0)
- return ret;
- if (value & WCD_PIN_MASK(pin))
- return GPIO_LINE_DIRECTION_OUT;
- return GPIO_LINE_DIRECTION_IN;
- }
- static int wcd_gpio_direction_input(struct gpio_chip *chip, unsigned int pin)
- {
- struct wcd_gpio_data *data = gpiochip_get_data(chip);
- return regmap_update_bits(data->map, WCD_REG_DIR_CTL_OFFSET,
- WCD_PIN_MASK(pin), 0);
- }
- static int wcd_gpio_direction_output(struct gpio_chip *chip, unsigned int pin,
- int val)
- {
- struct wcd_gpio_data *data = gpiochip_get_data(chip);
- regmap_update_bits(data->map, WCD_REG_DIR_CTL_OFFSET,
- WCD_PIN_MASK(pin), WCD_PIN_MASK(pin));
- return regmap_update_bits(data->map, WCD_REG_VAL_CTL_OFFSET,
- WCD_PIN_MASK(pin),
- val ? WCD_PIN_MASK(pin) : 0);
- }
- static int wcd_gpio_get(struct gpio_chip *chip, unsigned int pin)
- {
- struct wcd_gpio_data *data = gpiochip_get_data(chip);
- unsigned int value;
- regmap_read(data->map, WCD_REG_VAL_CTL_OFFSET, &value);
- return !!(value & WCD_PIN_MASK(pin));
- }
- static void wcd_gpio_set(struct gpio_chip *chip, unsigned int pin, int val)
- {
- struct wcd_gpio_data *data = gpiochip_get_data(chip);
- regmap_update_bits(data->map, WCD_REG_VAL_CTL_OFFSET,
- WCD_PIN_MASK(pin), val ? WCD_PIN_MASK(pin) : 0);
- }
- static int wcd_gpio_probe(struct platform_device *pdev)
- {
- struct device *dev = &pdev->dev;
- struct wcd_gpio_data *data;
- struct gpio_chip *chip;
- data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
- data->map = dev_get_regmap(dev->parent, NULL);
- if (!data->map) {
- dev_err(dev, "%s: failed to get regmap\n", __func__);
- return -EINVAL;
- }
- chip = &data->chip;
- chip->direction_input = wcd_gpio_direction_input;
- chip->direction_output = wcd_gpio_direction_output;
- chip->get_direction = wcd_gpio_get_direction;
- chip->get = wcd_gpio_get;
- chip->set = wcd_gpio_set;
- chip->parent = dev;
- chip->base = -1;
- chip->ngpio = WCD934X_NPINS;
- chip->label = dev_name(dev);
- chip->of_gpio_n_cells = 2;
- chip->can_sleep = false;
- return devm_gpiochip_add_data(dev, chip, data);
- }
- static const struct of_device_id wcd_gpio_of_match[] = {
- { .compatible = "qcom,wcd9340-gpio" },
- { .compatible = "qcom,wcd9341-gpio" },
- { }
- };
- MODULE_DEVICE_TABLE(of, wcd_gpio_of_match);
- static struct platform_driver wcd_gpio_driver = {
- .driver = {
- .name = "wcd934x-gpio",
- .of_match_table = wcd_gpio_of_match,
- },
- .probe = wcd_gpio_probe,
- };
- module_platform_driver(wcd_gpio_driver);
- MODULE_DESCRIPTION("Qualcomm Technologies, Inc WCD GPIO control driver");
- MODULE_LICENSE("GPL v2");
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