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| author |   Jason Gerecke <killertofu@gmail.com> | 2017-07-24 09:46:18 -0700 |
|---|---|---|
| committer |   Jiri Kosina <jkosina@suse.cz> | 2017-07-27 15:14:28 +0200 |
| commit | fc2237a724a9e448599076d7d23497f51e2f7441 (patch) | |
| tree | 0f6fc077d1452bba1d2e690d08f6bef622f20919 /drivers/hid/i2c-hid/i2c-hid.c | |
| parent | HID: wacom: Remove comparison of u8 mode with zero and simplify. (diff) | |
| download | linux-dev-fc2237a724a9e448599076d7d23497f51e2f7441.tar.xz linux-dev-fc2237a724a9e448599076d7d23497f51e2f7441.zip | |
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/i2c-hid/i2c-hid.c')
| -rw-r--r-- | drivers/hid/i2c-hid/i2c-hid.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c index 046f692fd0a2..77396145d2d0 100644 --- a/drivers/hid/i2c-hid/i2c-hid.c +++ b/drivers/hid/i2c-hid/i2c-hid.c @@ -780,7 +780,7 @@ static int i2c_hid_power(struct hid_device *hid, int lvl) return 0; } -static struct hid_ll_driver i2c_hid_ll_driver = { +struct hid_ll_driver i2c_hid_ll_driver = { .parse = i2c_hid_parse, .start = i2c_hid_start, .stop = i2c_hid_stop, @@ -790,6 +790,7 @@ static struct hid_ll_driver i2c_hid_ll_driver = { .output_report = i2c_hid_output_report, .raw_request = i2c_hid_raw_request, }; +EXPORT_SYMBOL_GPL(i2c_hid_ll_driver); static int i2c_hid_init_irq(struct i2c_client *client) { |