On Mon, Apr 10, 2017 at 08:55:29PM +0200, Hans de Goede wrote: > acpi_dev_found just iterates over all ACPI-ids and sees if one matches. > This means that it will return true for devices which are in the dsdt > but disabled (their _STA method returns 0). > > For some drivers it is useful to be able to check if a certain HID > is not only present in the namespace, but also actually present as in > acpi_device_is_present() will return true for the device. For example > because if a certain device is present then the driver will want to use > an extcon or IIO adc channel provided by that device. > > This commit adds a new acpi_dev_present helper which drivers can use > to this end. > > Like acpi_dev_found, acpi_dev_present take a HID as argument, but > it also has 2 extra optional arguments to only check for an ACPI > device with a specific UID and/or HRV value. This makes it more > generic and allows it to replace custom code doing similar checks > in several places. > > Arguably acpi_dev_present is what acpi_dev_found should have been, but > there are too many users to just change acpi_dev_found without the risk > of breaking something. > > Cc: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
