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HID: fix up .raw_event() documentation 

The documentation for the .raw_event() callback says that if the
driver return 1, there will be no further processing of the event,
but this is not true, the actual code in hid-core.c looks like this:

  if (hdrv && hdrv->raw_event && hid_match_report(hid, report)) {
           ret = hdrv->raw_event(hid, report, data, size);
           if (ret < 0)
                   goto unlock;
   }

   ret = hid_report_raw_event(hid, type, data, size, interrupt);

The only return value that has any effect on the processing is
a negative error.

Correct this as it seems to confuse people: I found bogus code in
the Razer out-of-tree driver attempting to return 1 here.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
hifive-unleashed-5.1
Linus Walleij 2018-11-04 11:32:47 +01:00 committed by Jiri Kosina
parent 3fc202e81d
commit aa9b760cec
1 changed files with 2 additions and 2 deletions
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4
include/linux/hid.h
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@ -722,8 +722,8 @@ struct hid_usage_id {
* input will not be passed to raw_event unless hid_device_io_start is
* called.
*
* raw_event and event should return 0 on no action performed, 1 when no
* further processing should be done and negative on error
* raw_event and event should return negative on error, any other value will
* pass the event on to .event() typically return 0 for success.
*
* input_mapping shall return a negative value to completely ignore this usage
* (e.g. doubled or invalid usage), zero to continue with parsing of this