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HID: cougar: make compare_device_paths reusable

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The function compare_device_paths from wacom_sys.c is generic
and useful for other drivers. Move the function to hid-core and
rename it as hid_compare_device_paths.

Signed-off-by: Daniel M. Lambea <dmlambea@gmail.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Daniel M. Lambea
2018-07-17 22:35:36 +01:00
committed by Jiri Kosina
parent 092150a25c
commit 1a8861f117
3 changed files with 28 additions and 15 deletions
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23
drivers/hid/hid-core.c
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@@ -1939,6 +1939,29 @@ static int hid_bus_match(struct device *dev, struct device_driver *drv)
return hid_match_device(hdev, hdrv) != NULL;
}
/**
* hid_compare_device_paths - check if both devices share the same path
* @hdev_a: hid device
* @hdev_b: hid device
* @separator: char to use as separator
*
* Check if two devices share the same path up to the last occurrence of
* the separator char. Both paths must exist (i.e., zero-length paths
* don't match).
*/
bool hid_compare_device_paths(struct hid_device *hdev_a,
struct hid_device *hdev_b, char separator)
{
int n1 = strrchr(hdev_a->phys, separator) - hdev_a->phys;
int n2 = strrchr(hdev_b->phys, separator) - hdev_b->phys;
if (n1 != n2 || n1 <= 0 || n2 <= 0)
return false;
return !strncmp(hdev_a->phys, hdev_b->phys, n1);
}
EXPORT_SYMBOL_GPL(hid_compare_device_paths);
static int hid_device_probe(struct device *dev)
{
struct hid_driver *hdrv = to_hid_driver(dev->driver);