On Thu, Feb 04, 2010 at 07:33:22PM +0100, Jiri Slaby wrote:
> On 02/04/2010 07:14 PM, Dmitry Torokhov wrote:
> > On Thu, Feb 04, 2010 at 11:31:45AM +0100, Jiri Slaby wrote:
> > +
> >> +static int dvb_event(struct hid_device *hdev, struct hid_field *field,
> >> + struct hid_usage *usage, __s32 value)
> >> +{
> >> + /* we won't get a "key up" event */
> >> + if (value) {
> >> + input_event(field->hidinput->input, usage->type, usage->code,
> >> 1);
> >> + input_event(field->hidinput->input, usage->type, usage->code,
> >> 0);
> >
> > Do not ever forget input_sync(), you need 2 of them here.
> >
> > With the latest changes to evdev, if you are using SIGIO you won't get
> > wioken up until EV_SYN/SYN_REPORT.
>
> HID layer syncs on its own. So the second is not needed. Why is needed
> the first?
>
Userpsace has a right to accumulate events and only act on them when
receiving EV_SYN. Press + release in the same event block may be treated
as no change. The same as REL_X +2, REL_X -2 - no need to move pointer at
all. And so on.
> I.e. should there be one also in dvb_usb_read_remote_control?
Probably, I have not looked.
--
Dmitry
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