linux-kernel - Re: [PATCH v2 1/9] HID: core: add "report" hook, called once the report has been parsed

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Date:	Mon, 4 Feb 2013 10:34:35 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Stephane Chatty <chatty@...c.fr>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/9] HID: core: add "report" hook, called once the
 report has been parsed

On Sun, 3 Feb 2013, Henrik Rydberg wrote:

> > This callback is called when the parsing of the report has been done
> > by hid-core (so after the calls to .event). The hid drivers can now
> > have access to the whole report by relying on the values stored in
> > the different fields.
> > 
> > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...il.com>
> > ---
> >  drivers/hid/hid-core.c | 4 ++++
> >  include/linux/hid.h    | 2 ++
> >  2 files changed, 6 insertions(+)
> > 
> > diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
> > index 5ae2cb1..b671e4e 100644
> > --- a/drivers/hid/hid-core.c
> > +++ b/drivers/hid/hid-core.c
> > @@ -1195,6 +1195,7 @@ int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
> >  {
> >  	struct hid_report_enum *report_enum = hid->report_enum + type;
> >  	struct hid_report *report;
> > +	struct hid_driver *hdrv;
> >  	unsigned int a;
> >  	int rsize, csize = size;
> >  	u8 *cdata = data;
> > @@ -1231,6 +1232,9 @@ int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
> >  	if (hid->claimed != HID_CLAIMED_HIDRAW) {
> >  		for (a = 0; a < report->maxfield; a++)
> >  			hid_input_field(hid, report->field[a], cdata, interrupt);
> > +		hdrv = hid->driver;
> > +		if (hdrv && hdrv->report)
> > +			hdrv->report(hid, report);
> 
> I think this is more useful if called before the individual fields. In
> fact, it seems raw_event() is already doing exactly that. No need for
> a new callback, in other words.

raw_event() doesn't provide equivalent functionality though; namely, the 
report is not parsed.

Or have I missed your point?

Thanks for the extensive review, Henrik, it's really helpful.

-- 
Jiri Kosina
SUSE Labs
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