125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (c) 2019, Linaro Limited
|
|
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/module.h>
|
|
#include <linux/gpio/driver.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/slab.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->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");
|