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gpiolib / ACPI: add ACPI support for gpiod_get_index() 

gpiod_get_index() and gpiod_get() are now the new preferred way to request
GPIOs. Add support for finding the corresponding GPIO descriptor from ACPI
namespace.

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>
This commit is contained in:
Mika Westerberg 2013-10-10 11:01:09 +03:00 committed by Linus Walleij
parent 936e15dd21
commit 81f59e9d13
1 changed files with 10 additions and 0 deletions
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10
drivers/gpio/gpiolib.c
View File

@ -10,6 +10,7 @@
#include <linux/seq_file.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/acpi_gpio.h>
#include <linux/idr.h>
#include <linux/slab.h>
@ -2260,6 +2261,12 @@ static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
}
#endif
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);
}
static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,
unsigned int idx, unsigned long *flags)
{
@ -2361,6 +2368,9 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) {
dev_dbg(dev, "using device tree for GPIO lookup\n");
desc = of_find_gpio(dev, con_id, idx, &flags);
} else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) {
dev_dbg(dev, "using ACPI for GPIO lookup\n");
desc = acpi_find_gpio(dev, con_id, idx, &flags);
} else {
dev_dbg(dev, "using lookup tables for GPIO lookup");
desc = gpiod_find(dev, con_id, idx, &flags);