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authorHans de Goede <hdegoede@redhat.com>2017-04-19 15:02:08 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-04-19 23:53:34 +0300
commit8661423eea1a1b58417014716e3f1ba286072379 (patch)
tree686462c9b7444bbc6ae2eb338901deb356c2c98b /drivers/acpi/battery.c
parent4f7d029b9bf009fbee76bb10c0c4351a1870d2f3 (diff)
ACPI / utils: Add new acpi_dev_present helper
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. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Lukas Wunner <lukas@wunner.de> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/battery.c')
0 files changed, 0 insertions, 0 deletions