gpios: palmas: add .get_direction() op

Accessing debug/gpio is quite noisy without a get_direction()
implementation. To calm that down add an implementation.

Fixes: 3d50a2785271 ("gpio: palmas: Add support for Palmas GPIO")
Cc: stable@vger.kernel.org
Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Link: https://patch.msgid.link/20260704-palmas-getdirection-v2-1-2fd85fee3832@kemnade.info
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>

diff --git a/drivers/gpio/gpio-palmas.c b/drivers/gpio/gpio-palmas.c
index e377f6dd4ccf131a08b1268aeb56ca9ff69daa0e..e64ee048771852fd858483cfa81712324e2df368 100644 (file)
--- a/drivers/gpio/gpio-palmas.c
+++ b/drivers/gpio/gpio-palmas.c
@@ -116,6 +116,24 @@ static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
        return ret;
 }
 
+static int palmas_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
+{
+       struct palmas_gpio *pg = gpiochip_get_data(gc);
+       struct palmas *palmas = pg->palmas;
+       unsigned int val;
+       unsigned int reg;
+       int ret;
+       int gpio16 = (offset/8);
+
+       offset %= 8;
+       reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
+       ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
+       if (ret)
+               return ret;
+
+       return (val & BIT(offset)) ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN;
+}
+
 static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
 {
        struct palmas_gpio *pg = gpiochip_get_data(gc);
@@ -165,6 +183,7 @@ static int palmas_gpio_probe(struct platform_device *pdev)
        palmas_gpio->gpio_chip.can_sleep = true;
        palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
        palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
+       palmas_gpio->gpio_chip.get_direction = palmas_gpio_get_direction;
        palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
        palmas_gpio->gpio_chip.set      = palmas_gpio_set;
        palmas_gpio->gpio_chip.get      = palmas_gpio_get;