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HID: uhid: Add UHID_CREATE2 + UHID_INPUT2

Telusuri Sumber 
UHID_CREATE2:
HID report descriptor data (rd_data) is an array in struct uhid_create2_req,
instead of a pointer. Enables use from languages that don't support pointers,
e.g. Python.

UHID_INPUT2:
Data array is the last field of struct uhid_input2_req. Enables userspace to
write only the required bytes to kernel (ev.type + ev.u.input2.size + the part
of the data array that matters), instead of the entire struct uhid_input2_req.

Note:
UHID_CREATE2 increases the total size of struct uhid_event slightly, thus
increasing the size of messages that are queued for userspace. However, this
won't affect the userspace processing of these events.

[Jiri Kosina <jkosina@suse.cz>: adjust to hid_get_raw_report() and
				hid_output_raw_report() API changes]

Signed-off-by: Petri Gynther <pgynther@google.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Petri Gynther
2014-03-24 13:50:01 -07:00
committed by Jiri Kosina
orang tua c3d77fab51
melakukan 4522643aa9
3 mengubah file dengan 112 tambahan dan 0 penghapusan
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11
Documentation/hid/uhid.txt
Melihat File

@@ -93,6 +93,11 @@ the request was handled successfully.
event to the kernel. The payload is of type struct uhid_create_req and
contains information about your device. You can start I/O now.
UHID_CREATE2:
Same as UHID_CREATE, but the HID report descriptor data (rd_data) is an array
inside struct uhid_create2_req, instead of a pointer to a separate array.
Enables use from languages that don't support pointers, e.g. Python.
UHID_DESTROY:
This destroys the internal HID device. No further I/O will be accepted. There
may still be pending messages that you can receive with read() but no further
@@ -105,6 +110,12 @@ the request was handled successfully.
contains a data-payload. This is the raw data that you read from your device.
The kernel will parse the HID reports and react on it.
UHID_INPUT2:
Same as UHID_INPUT, but the data array is the last field of uhid_input2_req.
Enables userspace to write only the required bytes to kernel (ev.type +
ev.u.input2.size + the part of the data array that matters), instead of
the entire struct uhid_input2_req.
UHID_FEATURE_ANSWER:
If you receive a UHID_FEATURE request you must answer with this request. You
must copy the "id" field from the request into the answer. Set the "err" field