Re: [PATCH] hid: Do not create input devices for feature reports

[Benjamin Tissoires <benjamin.tissoires@enac.fr>]

Hi Jiri,

Tested-by: Benjamin Tissoires <benjmain.tissoires@gmail.com>
Acked-by: Benjamin Tissoires <benjmain.tissoires@gmail.com>

Cheers,
Benjamin

On Tue, Mar 1, 2011 at 17:03, Jiri Kosina <jkosina@suse.cz> wrote:
> On Thu, 24 Feb 2011, Henrik Rydberg wrote:
>
>> When the multi input quirk is set, there is a new input device
>> created for every feature report. Since the idea is to present
>> features per hid device, not per input device, revert back to
>> the original report loop and change the feature_mapping() callback
>> to not take the input device as argument.
>>
>> Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
>
> Hi Henrik,
>
> I agree with this implementation.
>
> Benjamin, did you manage to do the tests with hid-multitouch driver so
> that I could put your Tested-by: to the patch and apply it?
>
> Thanks.
>
>> ---
>> Hi Jiri, Benjamin,
>>
>> It seems the feature report callback was a bit intrusive, after all;
>> for some devices such as ntrig, with multi input, there are additional
>> input devices created. The following patch seems to fix the problem,
>> but it has not been tested on any device using the hid-multitouch
>> driver.
>>
>> Thanks,
>> Henrik
>>
>>  drivers/hid/hid-input.c      |   30 +++++++++++++++++++++---------
>>  drivers/hid/hid-multitouch.c |    2 +-
>>  include/linux/hid.h          |    2 +-
>>  3 files changed, 23 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
>> index 7f552bf..ebcc02a 100644
>> --- a/drivers/hid/hid-input.c
>> +++ b/drivers/hid/hid-input.c
>> @@ -290,14 +290,6 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
>>               goto ignore;
>>       }
>>
>> -     if (field->report_type == HID_FEATURE_REPORT) {
>> -             if (device->driver->feature_mapping) {
>> -                     device->driver->feature_mapping(device, hidinput, field,
>> -                             usage);
>> -             }
>> -             goto ignore;
>> -     }
>> -
>>       if (device->driver->input_mapping) {
>>               int ret = device->driver->input_mapping(device, hidinput, field,
>>                               usage, &bit, &max);
>> @@ -835,6 +827,24 @@ static void hidinput_close(struct input_dev *dev)
>>       hid_hw_close(hid);
>>  }
>>
>> +static void report_features(struct hid_device *hid)
>> +{
>> +     struct hid_driver *drv = hid->driver;
>> +     struct hid_report_enum *rep_enum;
>> +     struct hid_report *rep;
>> +     int i, j;
>> +
>> +     if (!drv->feature_mapping)
>> +             return;
>> +
>> +     rep_enum = &hid->report_enum[HID_FEATURE_REPORT];
>> +     list_for_each_entry(rep, &rep_enum->report_list, list)
>> +             for (i = 0; i < rep->maxfield; i++)
>> +                     for (j = 0; j < rep->field[i]->maxusage; j++)
>> +                             drv->feature_mapping(hid, rep->field[i],
>> +                                                  rep->field[i]->usage + j);
>> +}
>> +
>>  /*
>>   * Register the input device; print a message.
>>   * Configure the input layer interface
>> @@ -863,7 +873,9 @@ int hidinput_connect(struct hid_device *hid, unsigned int force)
>>                       return -1;
>>       }
>>
>> -     for (k = HID_INPUT_REPORT; k <= HID_FEATURE_REPORT; k++) {
>> +     report_features(hid);
>> +
>> +     for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++) {
>>               if (k == HID_OUTPUT_REPORT &&
>>                       hid->quirks & HID_QUIRK_SKIP_OUTPUT_REPORTS)
>>                       continue;
>> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
>> index 07d3183..2bbc954 100644
>> --- a/drivers/hid/hid-multitouch.c
>> +++ b/drivers/hid/hid-multitouch.c
>> @@ -122,7 +122,7 @@ struct mt_class mt_classes[] = {
>>       { }
>>  };
>>
>> -static void mt_feature_mapping(struct hid_device *hdev, struct hid_input *hi,
>> +static void mt_feature_mapping(struct hid_device *hdev,
>>               struct hid_field *field, struct hid_usage *usage)
>>  {
>>       if (usage->hid == HID_DG_INPUTMODE) {
>> diff --git a/include/linux/hid.h b/include/linux/hid.h
>> index d91c25e..fc5faf6 100644
>> --- a/include/linux/hid.h
>> +++ b/include/linux/hid.h
>> @@ -638,7 +638,7 @@ struct hid_driver {
>>                       struct hid_input *hidinput, struct hid_field *field,
>>                       struct hid_usage *usage, unsigned long **bit, int *max);
>>       void (*feature_mapping)(struct hid_device *hdev,
>> -                     struct hid_input *hidinput, struct hid_field *field,
>> +                     struct hid_field *field,
>>                       struct hid_usage *usage);
>>  #ifdef CONFIG_PM
>>       int (*suspend)(struct hid_device *hdev, pm_message_t message);
>> --
>> 1.7.4.1
>>
>
> --
> Jiri Kosina
> SUSE Labs, Novell Inc.
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