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SubjectRe: [PATCH] HID: quirks: Add no_init_reports for AKAI midi controller


On Thu, 28 Jan 2016, Oliver Neukum wrote:

> On Wed, 2016-01-27 at 22:31 +0100, Jiri Kosina wrote:
>> On Wed, 27 Jan 2016, Stafford Horne wrote:
>>
>>> The midi controller times-out while initializing reports, this
>>> causes boot to take an extra 10 seconds. The device descriptor
>>> advertises that it has an internal HID device but seems to not
>>> actually do anything useful.
>>>
>>> Signed-off-by: Stafford Horne <shorne@gmail.com>
>>> ---
>>> drivers/hid/hid-ids.h | 3 +++
>>> drivers/hid/usbhid/hid-quirks.c | 1 +
>>> 2 files changed, 4 insertions(+)
>>>
>>> diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
>>> index b6ff6e7..3dfb166 100644
>>> --- a/drivers/hid/hid-ids.h
>>> +++ b/drivers/hid/hid-ids.h
>>> @@ -61,6 +61,9 @@
>>> #define USB_VENDOR_ID_AIREN 0x1a2c
>>> #define USB_DEVICE_ID_AIREN_SLIMPLUS 0x0002
>>>
>>> +#define USB_VENDOR_ID_AKAI 0x2011
>>> +#define USB_DEVICE_ID_AKAI_MPKMINI2 0x0715
>>> +
>>> #define USB_VENDOR_ID_ALCOR 0x058f
>>> #define USB_DEVICE_ID_ALCOR_USBRS232 0x9720
>>>
>>> diff --git a/drivers/hid/usbhid/hid-quirks.c b/drivers/hid/usbhid/hid-quirks.c
>>> index 7dd0953..055e740 100644
>>> --- a/drivers/hid/usbhid/hid-quirks.c
>>> +++ b/drivers/hid/usbhid/hid-quirks.c
>>> @@ -55,6 +55,7 @@ static const struct hid_blacklist {
>>> { USB_VENDOR_ID_TOUCHPACK, USB_DEVICE_ID_TOUCHPACK_RTS, HID_QUIRK_MULTI_INPUT },
>>>
>>> { USB_VENDOR_ID_AIREN, USB_DEVICE_ID_AIREN_SLIMPLUS, HID_QUIRK_NOGET },
>>> + { USB_VENDOR_ID_AKAI, USB_DEVICE_ID_AKAI_MPKMINI2, HID_QUIRK_NO_INIT_REPORTS },
>>
>> If the (proclaimed) HID device is completely silent, wouldn't
>> HID_QUIRK_IGNORE be more appropriate?
>
> If it really is impossible to use the device.
> That quirk would preclude any use you are not aware of with almost
> no added benefit. I would take the patch as is.

That may be right, after having a look at usbhid quirks, no device yet has
HID_QUIRK_IGNORE. Also, I have a feeling the HID enpoints might have some
proprietary functionality.

The defined interface descriptors are 1 HID, 2 Audio Control Device, 3 Audio
MIDI streaming. I tried to write and read from the HID endpoints using
hidraw with no luck. But someone else might figure it out.

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