[PATCH v4 10/12] gpio: wcd934x: Add support to wcd934x gpio controller

Srinivas Kandagatla
2019-11-21T17:06:06Z

This patch adds support to wcd934x gpio block found in
WCD9340/WC9341 Audio codecs.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
drivers/gpio/Kconfig | 8 +++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-wcd934x.c | 104 ++++++++++++++++++++++++++++++++++++
3 files changed, 113 insertions(+)
create mode 100644 drivers/gpio/gpio-wcd934x.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 38e096e6925f..4be583933b1e 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -586,6 +586,14 @@ 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
+ select GPIO_GENERIC
+ 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
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index d2fd19c15bae..496f632ac5c5 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -154,6 +154,7 @@ 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
diff --git a/drivers/gpio/gpio-wcd934x.c b/drivers/gpio/gpio-wcd934x.c
new file mode 100644
index 000000000000..0aac33235c5f
--- /dev/null
+++ b/drivers/gpio/gpio-wcd934x.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019, Linaro Limited
+
+#include <linux/module.h>
+#include <linux/gpio.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_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 = 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");
--
2.21.0