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Subject[PATCH 2/3] gpio: max77620: Implement gpio_get_direction callback
Date
Implement gpio_get_direction() callback for MAX77620 GPIO.
This is useful for debugfs and the userspace ABI.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
---
drivers/gpio/gpio-max77620.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

diff --git a/drivers/gpio/gpio-max77620.c b/drivers/gpio/gpio-max77620.c
index 35f365c..0bb6d93 100644
--- a/drivers/gpio/gpio-max77620.c
+++ b/drivers/gpio/gpio-max77620.c
@@ -9,6 +9,7 @@
*/

#include <linux/gpio/driver.h>
+#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/mfd/max77620.h>
#include <linux/module.h>
@@ -152,6 +153,23 @@ static int max77620_gpio_dir_output(struct gpio_chip *gc, unsigned int offset,
return ret;
}

+static int max77620_gpio_get_direction(struct gpio_chip *gc,
+ unsigned int offset)
+{
+ struct max77620_gpio *mgpio = gpiochip_get_data(gc);
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(mgpio->rmap, GPIO_REG_ADDR(offset), &val);
+ if (ret < 0) {
+ dev_err(mgpio->dev, "GPIO register read failed: %d\n", ret);
+ return ret;
+ }
+
+ return (val & MAX77620_CNFG_GPIO_DIR_MASK) ?
+ GPIOF_DIR_IN : GPIOF_DIR_OUT;
+}
+
static int max77620_gpio_set_debounce(struct gpio_chip *gc,
unsigned int offset,
unsigned int debounce)
@@ -236,6 +254,7 @@ static int max77620_gpio_probe(struct platform_device *pdev)
mgpio->gpio_chip.direction_input = max77620_gpio_dir_input;
mgpio->gpio_chip.get = max77620_gpio_get;
mgpio->gpio_chip.direction_output = max77620_gpio_dir_output;
+ mgpio->gpio_chip.get_direction = max77620_gpio_get_direction;
mgpio->gpio_chip.set_debounce = max77620_gpio_set_debounce;
mgpio->gpio_chip.set = max77620_gpio_set;
mgpio->gpio_chip.to_irq = max77620_gpio_to_irq;
--
2.1.4
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