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gpio / ACPI: Add support for retrieving GpioInt resources from a device
ACPI specification knows two types of GPIOs: GpioIo and GpioInt. The latter is used to describe that a given device interrupt line is connected to a specific GPIO pin. Typical ACPI _CRS entry for such device looks like below: Name (_CRS, ResourceTemplate () { I2cSerialBus (0x004A, ControllerInitiated, 0x00061A80, AddressingMode7Bit, "\\_SB.PCI0.I2C6", 0x00, ResourceConsumer) GpioIo (Exclusive, PullDefault, 0x0000, 0x0000, IoRestrictionOutputOnly, "\\_SB.GPO0", 0x00, ResourceConsumer) { 0x004B } GpioInt (Level, ActiveLow, Shared, PullDefault, 0x0000, "\\_SB.GPO0", 0x00, ResourceConsumer) { 0x004C } }) Currently drivers need to request a GPIO corresponding to the right GpioInt and then translate that to Linux IRQ number. This adds unnecessary lines of boiler-plate code. We can ease this a bit by introducing acpi_dev_gpio_irq_get() analogous to of_irq_get(). This function translates given GpioInt resource under the device in question to the suitable Linux IRQ number. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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2 changed files with 36 additions and 0 deletions
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@ -514,6 +514,35 @@ struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
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return lookup.desc ? lookup.desc : ERR_PTR(-ENOENT);
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}
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/**
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* acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
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* @adev: pointer to a ACPI device to get IRQ from
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* @index: index of GpioInt resource (starting from %0)
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*
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* If the device has one or more GpioInt resources, this function can be
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* used to translate from the GPIO offset in the resource to the Linux IRQ
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* number.
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*
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* Return: Linux IRQ number (>%0) on success, negative errno on failure.
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*/
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int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
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{
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int idx, i;
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for (i = 0, idx = 0; idx <= index; i++) {
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struct acpi_gpio_info info;
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struct gpio_desc *desc;
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desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);
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if (IS_ERR(desc))
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break;
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if (info.gpioint && idx++ == index)
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return gpiod_to_irq(desc);
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}
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return -ENOENT;
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}
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EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get);
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static acpi_status
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acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
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u32 bits, u64 *value, void *handler_context,
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@ -721,6 +721,8 @@ static inline void acpi_dev_remove_driver_gpios(struct acpi_device *adev)
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if (adev)
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adev->driver_gpios = NULL;
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}
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int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index);
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#else
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static inline int acpi_dev_add_driver_gpios(struct acpi_device *adev,
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const struct acpi_gpio_mapping *gpios)
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@ -728,6 +730,11 @@ static inline int acpi_dev_add_driver_gpios(struct acpi_device *adev,
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return -ENXIO;
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}
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static inline void acpi_dev_remove_driver_gpios(struct acpi_device *adev) {}
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static inline int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
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{
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return -ENXIO;
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}
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#endif
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/* Device properties */
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