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HID: introduce hid_is_using_ll_driver

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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 <[email protected]>
Acked-By: Benjamin Tissoires <[email protected]>
Signed-off-by: Jiri Kosina <[email protected]>
This commit is contained in:
Jason Gerecke 2017-07-24 09:46:18 -07:00 • committed by Jiri Kosina
commit fc2237a724
5 changed files with 19 additions and 4 deletions
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3
net/bluetooth/hidp/core.c
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@ -734,7 +734,7 @@ static void hidp_stop(struct hid_device *hid)
hid->claimed = 0;
}
static struct hid_ll_driver hidp_hid_driver = {
struct hid_ll_driver hidp_hid_driver = {
.parse = hidp_parse,
.start = hidp_start,
.stop = hidp_stop,
@ -743,6 +743,7 @@ static struct hid_ll_driver hidp_hid_driver = {
.raw_request = hidp_raw_request,
.output_report = hidp_output_report,
};
EXPORT_SYMBOL_GPL(hidp_hid_driver);
/* This function sets up the hid device. It does not add it
to the HID system. That is done in hidp_add_connection(). */