From 59c324683400b41caa6d85b091e812ee3d5415c3 Mon Sep 17 00:00:00 2001 From: Srinivas Kandagatla Date: Tue, 7 Jan 2020 13:08:44 +0000 Subject: gpio: wcd934x: Add support to wcd934x gpio controller This patch adds support to wcd934x gpio block found in WCD9340/WC9341 Audio codecs. Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20200107130844.20763-3-srinivas.kandagatla@linaro.org Signed-off-by: Linus Walleij --- drivers/gpio/gpio-wcd934x.c | 121 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 121 insertions(+) create mode 100644 drivers/gpio/gpio-wcd934x.c (limited to 'drivers/gpio/gpio-wcd934x.c') diff --git a/drivers/gpio/gpio-wcd934x.c b/drivers/gpio/gpio-wcd934x.c new file mode 100644 index 000000000000..74913f2e5697 --- /dev/null +++ b/drivers/gpio/gpio-wcd934x.c @@ -0,0 +1,121 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019, Linaro Limited + +#include +#include +#include +#include +#include + +#define WCD_PIN_MASK(p) BIT(p - 1) +#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); + 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) +{ + wcd_gpio_direction_output(chip, pin, val); +} + +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"); -- cgit v1.2.3