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authorJavier Arteaga <javier@emutex.com>2018-03-06 16:42:13 +0300
committerLinus Walleij <linus.walleij@linaro.org>2018-03-23 06:07:22 +0300
commit67e6d3e83c18188bdc1467663c49787f8d4fdc0d (patch)
treee5f6a498296ea128d72f171ec6c371fdc05f2613 /drivers/pinctrl
parent86822c2f3a7c343cadcbebae1d5f7d75de1b3cfe (diff)
downloadlinux-67e6d3e83c18188bdc1467663c49787f8d4fdc0d.tar.xz
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>
Diffstat (limited to 'drivers/pinctrl')
-rw-r--r--drivers/pinctrl/intel/pinctrl-intel.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index 96e73e30204e..1e24a6b8a64e 100644
--- 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,