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authorJason Gerecke <killertofu@gmail.com>2017-07-24 19:46:18 +0300
committerJiri Kosina <jkosina@suse.cz>2017-07-27 16:14:28 +0300
commitfc2237a724a9e448599076d7d23497f51e2f7441 (patch)
tree0f6fc077d1452bba1d2e690d08f6bef622f20919 /drivers/hid/uhid.c
parentbc35f73aa62f51b80f769d3a6617f4a4ba11d81e (diff)
downloadlinux-fc2237a724a9e448599076d7d23497f51e2f7441.tar.xz
HID: introduce hid_is_using_ll_driver
Although HID itself is transport-agnostic, occasionally a driver may want to interact with the low-level transport that a device is connected through. To do this, we need to know what kind of bus is in use. The first guess may be to look at the 'bus' field of the 'struct hid_device', but this field may be emulated in some cases (e.g. uhid). More ideally, we can check which ll_driver a device is using. This function introduces a 'hid_is_using_ll_driver' function and makes the 'struct hid_ll_driver' of the four most common transports accessible through hid.h. Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com> Acked-By: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/uhid.c')
-rw-r--r--drivers/hid/uhid.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
index 7f8ff39ed44b..6f819f144cb4 100644
--- a/drivers/hid/uhid.c
+++ b/drivers/hid/uhid.c
@@ -369,7 +369,7 @@ static int uhid_hid_output_report(struct hid_device *hid, __u8 *buf,
return uhid_hid_output_raw(hid, buf, count, HID_OUTPUT_REPORT);
}
-static struct hid_ll_driver uhid_hid_driver = {
+struct hid_ll_driver uhid_hid_driver = {
.start = uhid_hid_start,
.stop = uhid_hid_stop,
.open = uhid_hid_open,
@@ -378,6 +378,7 @@ static struct hid_ll_driver uhid_hid_driver = {
.raw_request = uhid_hid_raw_request,
.output_report = uhid_hid_output_report,
};
+EXPORT_SYMBOL_GPL(uhid_hid_driver);
#ifdef CONFIG_COMPAT