*/
#include <linux/errno.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/export.h>
#include <linux/acpi_gpio.h>
#include <linux/acpi.h>
}
/**
- * acpi_get_gpio() - Translate ACPI GPIO pin to GPIO number usable with GPIO API
+ * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
* @path: ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
* @pin: ACPI GPIO pin number (0-based, controller-relative)
*
- * Returns GPIO number to use with Linux generic GPIO API, or errno error value
+ * Returns GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
+ * error value
*/
-int acpi_get_gpio(char *path, int pin)
+static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
{
struct gpio_chip *chip;
acpi_handle handle;
status = acpi_get_handle(NULL, path, &handle);
if (ACPI_FAILURE(status))
- return -ENODEV;
+ return ERR_PTR(-ENODEV);
chip = gpiochip_find(handle, acpi_gpiochip_find);
if (!chip)
- return -ENODEV;
+ return ERR_PTR(-ENODEV);
- if (!gpio_is_valid(chip->base + pin))
- return -EINVAL;
+ if (pin < 0 || pin > chip->ngpio)
+ return ERR_PTR(-EINVAL);
- return chip->base + pin;
+ return gpio_to_desc(chip->base + pin);
}
-EXPORT_SYMBOL_GPL(acpi_get_gpio);
static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
{
}
EXPORT_SYMBOL(acpi_gpiochip_request_interrupts);
+/**
+ * acpi_gpiochip_free_interrupts() - Free GPIO _EVT ACPI event interrupts.
+ * @chip: gpio chip
+ *
+ * Free interrupts associated with the _EVT method for the given GPIO chip.
+ *
+ * The remaining ACPI event interrupts associated with the chip are freed
+ * automatically.
+ */
+void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
+{
+ acpi_handle handle;
+ acpi_status status;
+ struct list_head *evt_pins;
+ struct acpi_gpio_evt_pin *evt_pin, *ep;
+
+ if (!chip->dev || !chip->to_irq)
+ return;
+
+ handle = ACPI_HANDLE(chip->dev);
+ if (!handle)
+ return;
+
+ status = acpi_get_data(handle, acpi_gpio_evt_dh, (void **)&evt_pins);
+ if (ACPI_FAILURE(status))
+ return;
+
+ list_for_each_entry_safe_reverse(evt_pin, ep, evt_pins, node) {
+ devm_free_irq(chip->dev, evt_pin->irq, evt_pin);
+ list_del(&evt_pin->node);
+ kfree(evt_pin);
+ }
+
+ acpi_detach_data(handle, acpi_gpio_evt_dh);
+ kfree(evt_pins);
+}
+EXPORT_SYMBOL(acpi_gpiochip_free_interrupts);
+
struct acpi_gpio_lookup {
struct acpi_gpio_info info;
int index;
- int gpio;
+ struct gpio_desc *desc;
int n;
};
if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
return 1;
- if (lookup->n++ == lookup->index && lookup->gpio < 0) {
+ if (lookup->n++ == lookup->index && !lookup->desc) {
const struct acpi_resource_gpio *agpio = &ares->data.gpio;
- lookup->gpio = acpi_get_gpio(agpio->resource_source.string_ptr,
- agpio->pin_table[0]);
+ lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
+ 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;
}
/**
- * acpi_get_gpio_by_index() - get a GPIO number from device resources
+ * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
* @dev: pointer to a device to get GPIO from
* @index: index of GpioIo/GpioInt resource (starting from %0)
* @info: info pointer to fill in (optional)
*
* Function goes through ACPI resources for @dev and based on @index looks
- * up a GpioIo/GpioInt resource, translates it to the Linux GPIO number,
+ * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
* and returns it. @index matches GpioIo/GpioInt resources only so if there
* are total %3 GPIO resources, the index goes from %0 to %2.
*
- * If the GPIO cannot be translated or there is an error, negative errno is
+ * If the GPIO cannot be translated or there is an error an ERR_PTR is
* returned.
*
* Note: if the GPIO resource has multiple entries in the pin list, this
* function only returns the first.
*/
-int acpi_get_gpio_by_index(struct device *dev, int index,
- struct acpi_gpio_info *info)
+struct gpio_desc *acpi_get_gpiod_by_index(struct device *dev, int index,
+ struct acpi_gpio_info *info)
{
struct acpi_gpio_lookup lookup;
struct list_head resource_list;
int ret;
if (!dev)
- return -EINVAL;
+ return ERR_PTR(-EINVAL);
handle = ACPI_HANDLE(dev);
if (!handle || acpi_bus_get_device(handle, &adev))
- return -ENODEV;
+ return ERR_PTR(-ENODEV);
memset(&lookup, 0, sizeof(lookup));
lookup.index = index;
- lookup.gpio = -ENODEV;
INIT_LIST_HEAD(&resource_list);
ret = acpi_dev_get_resources(adev, &resource_list, acpi_find_gpio,
&lookup);
if (ret < 0)
- return ret;
+ return ERR_PTR(ret);
acpi_dev_free_resource_list(&resource_list);
- if (lookup.gpio >= 0 && info)
+ if (lookup.desc && info)
*info = lookup.info;
- return lookup.gpio;
+ return lookup.desc ? lookup.desc : ERR_PTR(-ENODEV);
}
-EXPORT_SYMBOL_GPL(acpi_get_gpio_by_index);
-
-/**
- * acpi_gpiochip_free_interrupts() - Free GPIO _EVT ACPI event interrupts.
- * @chip: gpio chip
- *
- * Free interrupts associated with the _EVT method for the given GPIO chip.
- *
- * The remaining ACPI event interrupts associated with the chip are freed
- * automatically.
- */
-void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
-{
- acpi_handle handle;
- acpi_status status;
- struct list_head *evt_pins;
- struct acpi_gpio_evt_pin *evt_pin, *ep;
-
- if (!chip->dev || !chip->to_irq)
- return;
-
- handle = ACPI_HANDLE(chip->dev);
- if (!handle)
- return;
-
- status = acpi_get_data(handle, acpi_gpio_evt_dh, (void **)&evt_pins);
- if (ACPI_FAILURE(status))
- return;
-
- list_for_each_entry_safe_reverse(evt_pin, ep, evt_pins, node) {
- devm_free_irq(chip->dev, evt_pin->irq, evt_pin);
- list_del(&evt_pin->node);
- kfree(evt_pin);
- }
-
- acpi_detach_data(handle, acpi_gpio_evt_dh);
- kfree(evt_pins);
-}
-EXPORT_SYMBOL(acpi_gpiochip_free_interrupts);
+EXPORT_SYMBOL_GPL(acpi_get_gpiod_by_index);
projects / karo-tx-linux.git / blobdiff