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