diff options
Diffstat (limited to 'Documentation/hid/uhid.txt')
| -rw-r--r-- | Documentation/hid/uhid.txt | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/Documentation/hid/uhid.txt b/Documentation/hid/uhid.txt index 3c741214dfb..54c8f9706a9 100644 --- a/Documentation/hid/uhid.txt +++ b/Documentation/hid/uhid.txt @@ -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 @@ -114,7 +125,7 @@ the request was handled successfully. read() ------ -read() will return a queued ouput report. These output reports can be of type +read() will return a queued output report. These output reports can be of type UHID_START, UHID_STOP, UHID_OPEN, UHID_CLOSE, UHID_OUTPUT or UHID_OUTPUT_EV. No reaction is required to any of them but you should handle them according to your needs. Only UHID_OUTPUT and UHID_OUTPUT_EV have payloads. @@ -149,11 +160,13 @@ needs. Only UHID_OUTPUT and UHID_OUTPUT_EV have payloads. is of type "struct uhid_data_req". This may be received even though you haven't received UHID_OPEN, yet. - UHID_OUTPUT_EV: + UHID_OUTPUT_EV (obsolete): Same as UHID_OUTPUT but this contains a "struct input_event" as payload. This is called for force-feedback, LED or similar events which are received through an input device by the HID subsystem. You should convert this into raw reports and send them to your device similar to events of type UHID_OUTPUT. + This is no longer sent by newer kernels. Instead, HID core converts it into a + raw output report and sends it via UHID_OUTPUT. UHID_FEATURE: This event is sent if the kernel driver wants to perform a feature request as |