Re: [PATCH 00/15] Input - Wacom: switch from an USB to a HID driver

From: Jason Gerecke
Date: Thu Jul 10 2014 - 21:17:30 EST

On Wed, Jul 2, 2014 at 4:33 PM, Jason Gerecke <killertofu@xxxxxxxxx> wrote:
> On Mon, Jun 30, 2014 at 2:26 PM, Benjamin Tissoires
> <benjamin.tissoires@xxxxxxxxxx> wrote:
>> Hi guys,
>> this patch series is a cleanup for the Wacom USB driver.
>> I started working on this topic when I saw patches floating around which
>> implemented a report descriptor parser within the wacom.ko module.
>> However, we already have a nice HID subsystem which is more generic than the
>> HID implementation we can find in this USB driver.
>> Further details of the benefits (code reduction, regression tests) are hopefully
>> explained in the commit messages of the corresponding patches.
>> Also, I am working on a way to handle the new Wacom tablets in a more generic
>> way in the hid tree, so consider this patch series as a first step in this
>> direction.
>> This patch series transfers the wacom.ko driver from the input tree into the hid
>> tree. I did not made the corresponding move of the files in the series hoping
>> that we will find a way to achieve it if this step is validated.
>> IMO, the smoothest path would be that Jiri takes care of the wacom driver
>> in the input tree (and that we move into into the hid subfolder). This can be
>> achieve if the current pending wacom patches are applied in the hid tree too.
>> Another solution could be to keep the wacom changes in the input tree and put the
>> hid changes in the hid tree by using separate commits. Once 3.17 is out, we can
>> then change the module into the hid subfolder.
>> I wanted to send this patch series right now so we can figure out how we will
>> handle the transition.
>> I am pretty confident the patch series does not break any existing device
>> (except for the required user space changes which can be handled correctly if
>> we tackle them right now). The USB commands are executed in the same way,
>> and the protocol handling is also done in the same way.
>> Anyway, the net difference in lines of code (-307) should be enough to be of
>> interest.
>> Note: This patch series requires the current pending wacom patches to be applied.
>> I set up a tree with all the patch applied if anyone wants to give a try:
>> Cheers,
>> Benjamin
>> Benjamin Tissoires (15):
>> Input - wacom: include and use linux/hid.h
>> Input - wacom: switch from an USB driver to a HID driver
>> Input - wacom: use hid communication instead of plain usb
>> Input - wacom: use HID core to actually fetch the report descriptor
>> Input - wacom: compute the HID report size to get the actual packet
>> size
>> Input - wacom: install LED/OLED sysfs files in the HID device instead
>> of USB
>> Input - wacom: register the input devices on top of the HID one
>> Input - wacom: remove usb dependency for siblings devices
>> Input - wacom: register power device at the HID level
>> Input - wacom: use hid_info instead of plain dev_info
>> HID: uhid: add and set HID_TYPE_UHID for uhid devices
>> Input - wacom: use in-kernel HID parser
>> Input - wacom: use hidinput_calc_abs_res instead of duplicating its
>> code
>> Input - wacom: remove field pktlen declaration in the list of devices
>> Input - wacom: keep wacom_ids ordered
>> drivers/hid/hid-core.c | 15 +-
>> drivers/hid/hid-wacom.c | 2 +-
>> drivers/hid/uhid.c | 2 +
>> drivers/input/tablet/wacom.h | 7 +-
>> drivers/input/tablet/wacom_sys.c | 908 +++++++++++++--------------------------
>> drivers/input/tablet/wacom_wac.c | 647 ++++++++++++++--------------
>> drivers/input/tablet/wacom_wac.h | 10 +-
>> include/linux/hid.h | 4 +-
>> 8 files changed, 644 insertions(+), 951 deletions(-)
>> --
>> 2.0.0
> *cracks knuckles*
> Well, guess I better get to work poking and prodding at these and the
> pad patches. A very quick review doesn't raise any significant flags,
> though I do have a question or two that I might have for you in the
> next few days (need to read through the code more carefully to be sure
> I understand it correctly). My 24HDT is having some trouble
> initializing with the patches applied, but I'll need some time to
> track down the cause. Not sure how much I'll get done this week
> (holiday weekend) but next week I should have some feedback.
> Jason
> ---
> Now instead of four in the eights place /
> youâve got three, âCause you added one /
> (That is to say, eight) to the two, /
> But you canât take seven from three, /
> So you look at the sixty-fours....

I've had a chance to try out a dozen tablets with these modifications
and for the most part things seem to work fine. The 24HDT issue I
mentioned above was due to a conflict with some other patches I was
testing and can be ignored. Aside from the other known issues you've
already mentioned (and my inline comments), there's not much that I
can say (other than that I found some odd [but apparently unrelated]
issues with wacom_w8001 and isdv4-serial-inputattach...)

Reviewed-by: Jason Gerecke <killertofu@xxxxxxxxx>
Tested-by: Jason Gerecke <killertofu@xxxxxxxxx>

Now instead of four in the eights place /
youâve got three, âCause you added one /
(That is to say, eight) to the two, /
But you canât take seven from three, /
So you look at the sixty-fours....
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