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SubjectRe: [PATCH 2/2] hid: input: add HID_QUIRK_REUSE_AXES and fix dragonrise
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On Tue, 27 Sep 2016, Vladislav Naumov <vnaum@vnaum.com> wrote:
> Yes, I still have one of those!
> 0079:0011 DragonRise Inc. Gamepad
> Left shift buttons are broken now, but axis and main buttons are still working.
> Axis is handled properly with 3.16.0-4-686-pae #1 SMP Debian
> 3.16.7-ckt25-2 (2016-04-08) i686 GNU/Linux from debian/stable.
> I can test what you want.

Can you please wait a little until I post v2 later today and test v2
directly? Because the change in it's current form has no effect on
0079:0011 (the current quirk is enabled only for 0006).

When I add the input mapping in the hid-dr driver then it will affect
both 0006 and 0011 so that's the patch really worth testing.

Thanks a lot for taking time to test this,
Ionel

> Should I apply the patch from forwarded message to upstream kernel, or
> I can just pull it from some host with everything applied?
>
> On Mon, Sep 26, 2016 at 4:53 PM, Nikolai Kondrashov <spbnick@gmail.com> wrote:
>> Hi Benjamin,
>>
>> On 09/26/2016 12:29 PM, Benjamin Tissoires wrote:
>>>
>>> Ideally, we need to have Dragon Rise 0x0011 tested too. Nick, would you
>>> mind checking it if you still have this particular device?
>>
>>
>> I never had it, but perhaps Vladislav still has some.
>>
>> Vladislav, would you be able to test a change to the kernel module for your
>> Dragonrise gamepads?
>>
>> Please see below for context.
>>
>> Thank you.
>>
>> Nick
>>
>> On 09/26/2016 12:29 PM, Benjamin Tissoires wrote:
>>>
>>> On Sep 26 2016 or thereabouts, Ioan-Adrian Ratiu wrote:
>>>>
>>>> Commit 79346d620e9d ("HID: input: force generic axis to be mapped to
>>>> their
>>>> user space axis") made mapping generic axes to their userspace
>>>> equivalents
>>>> mandatory and some lower end gamepads which were depending on the
>>>> previous
>>>> behaviour suffered severe regressions because they were reusing axes and
>>>> expecting hid-input to multiplex their map to the respective userspace
>>>> axis
>>>> by always searching for and using the next available axis.
>>>
>>>
>>> Yes, I apologies for the breakage and the regression, though I must say
>>> that for now, only one hardware maker and one device (or range of devices
>>> from the look of it) has needed to be quirked.
>>>
>>>>
>>>> Now the result is that different device axes appear on a single axis in
>>>> userspace, which is clearly a regression in the hid-input driver because
>>>> it
>>>> needs to continue to handle this hardware as expected before the forcing
>>>> to provide the same interface to userspace.
>>>>
>>>> Since these lower-end gamepads like 0079:0006 are definitely the
>>>> exception,
>>>> create a quirk to fix them.
>>>
>>>
>>> Given that we only have this particular vendor that is an issue, I'd
>>> rather see the fix in hid-dr.c. The reason being that you actually don't
>>> need to have a global quirk and this simplifies the path in hid-input.
>>> Plus for users, they can just upgrade hid-dr without having to recompile
>>> their kernel when hid-core is not compiled as a module.
>>>
>>> The cleanest solution that wouldn't require any quirk in hid-core is to
>>> simply add an .input_mapping() callback in hid-dr.c.
>>>
>>> The code of the callback could be something like (untested):
>>>
>>> static int dr_input_mapping(struct hid_device *hdev, struct hid_input *hi,
>>> struct hid_field *field, struct hid_usage *usage,
>>> unsigned long **bit, int *max)
>>> {
>>> switch (usage->hid) {
>>> /*
>>> * revert the old hid-input behavior where axes
>>> * can be randomly assigned when the hid usage is
>>> * reused.
>>> */
>>> case HID_GD_X: case HID_GD_Y: case HID_GD_Z:
>>> case HID_GD_RX: case HID_GD_RY: case HID_GD_RZ:
>>> if (field->flags & HID_MAIN_ITEM_RELATIVE)
>>> map_rel(usage->hid & 0xf);
>>> else
>>> map_abs(usage->hid & 0xf);
>>> return 1;
>>> }
>>>
>>> return 0;
>>> }
>>>
>>> Hopefully, something like this should revert the old behavior for all
>>> hid-dr touchpads.
>>>
>>> Ideally, we need to have Dragon Rise 0x0011 tested too. Nick, would you
>>> mind checking it if you still have this particular device?
>>>
>>> Cheers,
>>> Benjamin
>>>
>>>>
>>>> Signed-off-by: Ioan-Adrian Ratiu <adi@adirat.com>
>>>> ---
>>>> drivers/hid/hid-dr.c | 2 ++
>>>> drivers/hid/hid-input.c | 16 +++++++++++-----
>>>> include/linux/hid.h | 1 +
>>>> 3 files changed, 14 insertions(+), 5 deletions(-)
>>>>
>>>> diff --git a/drivers/hid/hid-dr.c b/drivers/hid/hid-dr.c
>>>> index 2523f8a..27fc826 100644
>>>> --- a/drivers/hid/hid-dr.c
>>>> +++ b/drivers/hid/hid-dr.c
>>>> @@ -274,6 +274,8 @@ static int dr_probe(struct hid_device *hdev, const
>>>> struct hid_device_id *id)
>>>> hid_hw_stop(hdev);
>>>> goto err;
>>>> }
>>>> + /* has only 5 axes and reuses X, Y */
>>>> + hdev->quirks |= HID_QUIRK_REUSE_AXES;
>>>> break;
>>>> }
>>>>
>>>> diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
>>>> index fb9ace1..1cc6fe4 100644
>>>> --- a/drivers/hid/hid-input.c
>>>> +++ b/drivers/hid/hid-input.c
>>>> @@ -633,11 +633,17 @@ static void hidinput_configure_usage(struct
>>>> hid_input *hidinput, struct hid_fiel
>>>> /* These usage IDs map directly to the usage codes. */
>>>> case HID_GD_X: case HID_GD_Y: case HID_GD_Z:
>>>> case HID_GD_RX: case HID_GD_RY: case HID_GD_RZ:
>>>> - if (field->flags & HID_MAIN_ITEM_RELATIVE)
>>>> - map_rel(usage->hid & 0xf);
>>>> - else
>>>> - map_abs_clear(usage->hid & 0xf);
>>>> - break;
>>>> +
>>>> + /* if quirk is active don't force the userspace
>>>> mapping,
>>>> + * instead search and use the next available
>>>> axis.
>>>> + */
>>>> + if (!(device->quirks & HID_QUIRK_REUSE_AXES)) {
>>>> + if (field->flags &
>>>> HID_MAIN_ITEM_RELATIVE)
>>>> + map_rel(usage->hid & 0xf);
>>>> + else
>>>> + map_abs_clear(usage->hid & 0xf);
>>>> + break;
>>>> + }
>>>>
>>>> case HID_GD_SLIDER: case HID_GD_DIAL: case HID_GD_WHEEL:
>>>> if (field->flags & HID_MAIN_ITEM_RELATIVE)
>>>> diff --git a/include/linux/hid.h b/include/linux/hid.h
>>>> index 75b66ec..0979920 100644
>>>> --- a/include/linux/hid.h
>>>> +++ b/include/linux/hid.h
>>>> @@ -320,6 +320,7 @@ struct hid_item {
>>>> #define HID_QUIRK_NO_EMPTY_INPUT 0x00000100
>>>> #define HID_QUIRK_NO_INIT_INPUT_REPORTS 0x00000200
>>>> #define HID_QUIRK_ALWAYS_POLL 0x00000400
>>>> +#define HID_QUIRK_REUSE_AXES 0x00000800
>>>> #define HID_QUIRK_SKIP_OUTPUT_REPORTS 0x00010000
>>>> #define HID_QUIRK_SKIP_OUTPUT_REPORT_ID 0x00020000
>>>> #define HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP 0x00040000
>>>> --
>>>> 2.10.0
>>>>
>>

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