linux-kernel - Re: [PATCH 1/2] Bluetooth: hidp: implement hidinput_input

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Message-ID: <CANq1E4TmHzdh2cOUXzHCCUFpWsxaNjzyuU=puy1nYevDvHKvWQ@mail.gmail.com>
Date:	Thu, 11 Jul 2013 18:07:07 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	Benjamin Tissoires <benjamin.tissoires@...il.com>
Cc:	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Marcel Holtmann <marcel@...tmann.org>,
	Gustavo Padovan <gustavo@...ovan.org>,
	Jiri Kosina <jkosina@...e.cz>,
	"linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
	"open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] Bluetooth: hidp: implement hidinput_input_event callback

Hi

On Thu, Jul 11, 2013 at 4:10 PM, Benjamin Tissoires
<benjamin.tissoires@...il.com> wrote:
> Hi David,
>
> On Thu, Jul 11, 2013 at 4:02 PM, David Herrmann <dh.herrmann@...il.com> wrote:
>> Hi
>>
>>> +static int hidp_hidinput_event(struct input_dev *dev, unsigned int type,
>>> +                              unsigned int code, int value)
>>> +{
>>> +       struct hid_device *hid = input_get_drvdata(dev);
>>
>> I dislike that we have to deal with input_get_drvdata() in a transport
>> driver. It is not obvious from the transport driver that this gives us
>> an hid_device. But ok, that's how we do it in usbhid and hid-input so
>> it's another issue..
>
> right. So we should definitively change the callback signature here.
>
>>
>>> +       struct hidp_session *session = hid->driver_data;
>>> +       struct hid_field *field;
>>> +       int offset;
>>> +
>>> +       BT_DBG("session %p type %d code %d value %d",
>>> +              session, type, code, value);
>>> +
>>> +       if (type != EV_LED)
>>> +               return -1;
>>> +
>>> +       offset = hidinput_find_field(hid, type, code, &field);
>>> +       if (offset == -1) {
>>> +               hid_warn(dev, "event field not found\n");
>>> +               return -1;
>>> +       }
>>> +
>>> +       hid_set_field(field, offset, value);
>>> +
>>> +       return hidp_send_report(session, field->report);
>>> +}
>>> +
>>
>> We had this discussion before (regarding uhid and hidpinput_event), it
>> would be nice to have a helper in hid-input.c which does this. We copy
>> the code into every transport driver, which bugs me. But no-one
>> stepped up to do this, so I am fine.
>
> oh, yes, you are right. I'll add it to my todo list (now that I am
> responsible of 2/4 code duplication :-S )

Feel free to push this series forward unchanged, if it is urgent. I
have an experimental series here which implements a generic
hidinput_input_event() handler (including the scheduled worker) that I
will send later today or tomorrow.

Cheers
David

>>
>> Reviewed-by: David Herrmann <dh.herrmann@...il.com>
>
> Thanks for the review!
>
> Cheers,
> Benjamin
>
>>
>> Thanks!
>> David
>>
>>>  static int hidp_get_raw_report(struct hid_device *hid,
>>>                 unsigned char report_number,
>>>                 unsigned char *data, size_t count,
>>> @@ -711,6 +736,7 @@ static struct hid_ll_driver hidp_hid_driver = {
>>>         .stop = hidp_stop,
>>>         .open  = hidp_open,
>>>         .close = hidp_close,
>>> +       .hidinput_input_event = hidp_hidinput_event,
>>>  };
>>>
>>>  /* This function sets up the hid device. It does not add it
>>> --
>>> 1.8.3.1
>>>
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