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124 lines
3.1 KiB
124 lines
3.1 KiB
// 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) |
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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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