Commit 59c32468 authored by Srinivas Kandagatla's avatar Srinivas Kandagatla Committed by Linus Walleij
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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: default avatarSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200107130844.20763-3-srinivas.kandagatla@linaro.org


Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent e5e42ad2

drivers/gpio/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -619,6 +619,13 @@ config GPIO_VX855 
	  additional drivers must be enabled in order to use the

	  functionality of the device.



config GPIO_WCD934X

	tristate "Qualcomm Technologies Inc WCD9340/WCD9341 gpio controller driver"

	depends on MFD_WCD934X && OF_GPIO

	help

         This driver is to supprot GPIO block found on the Qualcomm Technologies

	 Inc WCD9340/WCD9341 Audio Codec.



config GPIO_XGENE

	bool "APM X-Gene GPIO controller support"

	depends on ARM64 && OF_GPIO

drivers/gpio/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -158,6 +158,7 @@ obj-$(CONFIG_GPIO_VF610) += gpio-vf610.o 
obj-$(CONFIG_GPIO_VIPERBOARD)		+= gpio-viperboard.o

obj-$(CONFIG_GPIO_VR41XX)		+= gpio-vr41xx.o

obj-$(CONFIG_GPIO_VX855)		+= gpio-vx855.o

obj-$(CONFIG_GPIO_WCD934X)		+= gpio-wcd934x.o

obj-$(CONFIG_GPIO_WHISKEY_COVE)		+= gpio-wcove.o

obj-$(CONFIG_GPIO_WINBOND)		+= gpio-winbond.o

obj-$(CONFIG_GPIO_WM831X)		+= gpio-wm831x.o

drivers/gpio/gpio-wcd934x.c

0 → 100644
+121 −0
Original line number Diff line number Diff line 
// 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 - 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");