Sorry for the rapid mail, I forgot to mention something.
wtp_connect won't work on non-HID++ devices. What about moving it down,
between the generic routines (reading protocol and name) and
hidpp_allocate_input? Then the connected parameter can also be dropped.
Kind regards,
Peter
On Wednesday 17 December 2014 00:33:55 Peter Wu wrote:
> On Tuesday 16 December 2014 17:06:01 Benjamin Tissoires wrote:
> > If wtp_connect() fails, that means most of the time that the device has
> > been disconnected. Subsequent attempts to contact the device will fail
> > too, so it's simpler to bail out earlier.
> >
> > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
> > ---
> > drivers/hid/hid-logitech-hidpp.c | 15 +++++++++------
> > 1 file changed, 9 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
> > index d008d71..c0fb5fe 100644
> > --- a/drivers/hid/hid-logitech-hidpp.c
> > +++ b/drivers/hid/hid-logitech-hidpp.c
> > @@ -914,24 +914,24 @@ static int wtp_allocate(struct hid_device *hdev, const struct hid_device_id *id)
> > return 0;
> > };
> >
> > -static void wtp_connect(struct hid_device *hdev, bool connected)
> > +static int wtp_connect(struct hid_device *hdev, bool connected)
> > {
> > struct hidpp_device *hidpp = hid_get_drvdata(hdev);
> > struct wtp_data *wd = hidpp->private_data;
> > int ret;
> >
> > if (!connected)
> > - return;
> > + return 0;
>
> "0" is success, what about -1 or -ENODEV here to signal an error? The
> following line (in hidpp_connect_event) returns on !connected, but that
> is no reason to return 0 here.
>
> ("No connection" sounds like an error condition to me as "[wtp_]connect"
> cannot do something meaningful.)
>
> Whether or not you change the return value is up to you. This patch is
> Reviewed-by: Peter Wu <peter@xxxxxxxxxxxxx>
>
> Kind regards,
> Peter
>
> > if (!wd->x_size) {
> > ret = wtp_get_config(hidpp);
> > if (ret) {
> > hid_err(hdev, "Can not get wtp config: %d\n", ret);
> > - return;
> > + return ret;
> > }
> > }
> >
> > - hidpp_touchpad_set_raw_report_state(hidpp, wd->mt_feature_index,
> > + return hidpp_touchpad_set_raw_report_state(hidpp, wd->mt_feature_index,
> > true, true);
> > }
> >
> > @@ -1115,8 +1115,11 @@ static void hidpp_connect_event(struct hidpp_device *hidpp)
> > struct input_dev *input;
> > char *name, *devm_name;
> >
> > - if (hidpp->quirks & HIDPP_QUIRK_CLASS_WTP)
> > - wtp_connect(hdev, connected);
> > + if (hidpp->quirks & HIDPP_QUIRK_CLASS_WTP) {
> > + ret = wtp_connect(hdev, connected);
> > + if (ret)
> > + return;
> > + }
> >
> > if (!connected || hidpp->delayed_input)
> > return;
> >
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