From 67e6d3e83c18188bdc1467663c49787f8d4fdc0d Mon Sep 17 00:00:00 2001
From: Javier Arteaga <javier@emutex.com>
Date: Tue, 6 Mar 2018 13:42:13 +0000
Subject: [PATCH] pinctrl: intel: Implement intel_gpio_get_direction callback
Git-commit: 67e6d3e83c18188bdc1467663c49787f8d4fdc0d
Patch-mainline: v4.17-rc1
References: FATE#326296
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/pinctrl/intel/pinctrl-intel.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
--- 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_c
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
.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,