pinctrl: intel: Implement intel_gpio_get_direction callback

Allows querying GPIO direction from the pad config register.
If the pad is not in GPIO mode, return an error.

Signed-off-by: Javier Arteaga <javier@emutex.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index 96e73e30204ee12eca4028055e2c8415f72fa301..1e24a6b8a64ee0eb548655f35c20575911ee77f8 100644 (file)
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -788,6 +788,24 @@ static void intel_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
        raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 }
 
+static int intel_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+       struct intel_pinctrl *pctrl = gpiochip_get_data(chip);
+       void __iomem *reg;
+       u32 padcfg0;
+
+       reg = intel_get_padcfg(pctrl, offset, PADCFG0);
+       if (!reg)
+               return -EINVAL;
+
+       padcfg0 = readl(reg);
+
+       if (padcfg0 & PADCFG0_PMODE_MASK)
+               return -EINVAL;
+
+       return !!(padcfg0 & PADCFG0_GPIOTXDIS);
+}
+
 static int intel_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 {
        return pinctrl_gpio_direction_input(chip->base + offset);
@@ -804,6 +822,7 @@ static const struct gpio_chip intel_gpio_chip = {
        .owner = THIS_MODULE,
        .request = gpiochip_generic_request,
        .free = gpiochip_generic_free,
+       .get_direction = intel_gpio_get_direction,
        .direction_input = intel_gpio_direction_input,
        .direction_output = intel_gpio_direction_output,
        .get = intel_gpio_get,