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authorMika Westerberg <mika.westerberg@linux.intel.com>2013-10-10 12:01:10 +0400
committerLinus Walleij <linus.walleij@linaro.org>2013-10-20 01:32:14 +0400
commite01f440a689aeb2d0e81c696fe2069f8d01d5d49 (patch)
tree656695ddd5ab89bf661b5d1a721d3f086328fcea /drivers/gpio
parent81f59e9d138c3ba0bd0f97d4e14f856d987e3f1d (diff)
downloadlinux-e01f440a689aeb2d0e81c696fe2069f8d01d5d49.tar.xz
gpiolib / ACPI: allow passing GPIOF_ACTIVE_LOW for GpioInt resources
The ACPI GpioInt resources contain polarity field that is used to specify whether the interrupt is active high or low. Since gpiolib supports GPIOF_ACTIVE_LOW we can pass this information in the flags field in acpi_find_gpio(), analogous to the DeviceTree version. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpiolib-acpi.c2
-rw-r--r--drivers/gpio/gpiolib.c12
2 files changed, 13 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 03187d0a3045..ae0ffdce8bd5 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -253,6 +253,8 @@ static int acpi_find_gpio(struct acpi_resource *ares, void *data)
agpio->pin_table[0]);
lookup->info.gpioint =
agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
+ lookup->info.active_low =
+ agpio->polarity == ACPI_ACTIVE_LOW;
}
return 1;
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index bee93c8c2361..9f3326b95e60 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2264,7 +2264,17 @@ static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
static struct gpio_desc *acpi_find_gpio(struct device *dev, const char *con_id,
unsigned int idx, unsigned long *flags)
{
- return acpi_get_gpiod_by_index(dev, idx, NULL);
+ struct acpi_gpio_info info;
+ struct gpio_desc *desc;
+
+ desc = acpi_get_gpiod_by_index(dev, idx, &info);
+ if (IS_ERR(desc))
+ return desc;
+
+ if (info.gpioint && info.active_low)
+ *flags |= GPIOF_ACTIVE_LOW;
+
+ return desc;
}
static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,