linux-kernel - Re: [PATCH] [v2] Input: Add "Share" button to Microsoft Xbox One controller.

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Date:   Tue, 2 Mar 2021 15:57:10 -0800
From:   Chris Ye <lzye@...gle.com>
To:     Bastien Nocera <hadess@...ess.net>
Cc:     Łukasz Patron <priv.luk@...il.com>,
        Benjamin Valentin <benpicco@...glemail.com>,
        Lee Jones <lee.jones@...aro.org>,
        Olivier Crête <olivier.crete@...ete.ca>,
        Sanjay Govind <sanjay.govind9@...il.com>,
        Andrzej Pietrasiewicz <andrzej.p@...labora.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        trivial@...nel.org, kernel-team@...roid.com
Subject: Re: [PATCH] [v2] Input: Add "Share" button to Microsoft Xbox One controller.

Hi Bastien,
    The "Share button" is a name Microsoft calls it, it actually has
HID descriptor defined in the bluetooth interface, which the HID usage
is:
consumer 0xB2:
0x05, 0x0C,        //   Usage Page (Consumer)
0x0A, 0xB2, 0x00,  //   Usage (Record)
Microsoft wants the same key code to be generated consistently for USB
and bluetooth.
Thanks!
Chris


On Tue, Mar 2, 2021 at 1:50 AM Bastien Nocera <hadess@...ess.net> wrote:
>
> On Thu, 2021-02-25 at 05:32 +0000, Chris Ye wrote:
> > Add "Share" button input capability and input event mapping for
> > Microsoft Xbox One controller.
> > Fixed Microsoft Xbox One controller share button not working under USB
> > connection.
> >
> > Signed-off-by: Chris Ye <lzye@...gle.com>
> > ---
> >  drivers/input/joystick/xpad.c | 9 ++++++++-
> >  1 file changed, 8 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/input/joystick/xpad.c
> > b/drivers/input/joystick/xpad.c
> > index 9f0d07dcbf06..0c3374091aff 100644
> > --- a/drivers/input/joystick/xpad.c
> > +++ b/drivers/input/joystick/xpad.c
> > @@ -79,6 +79,7 @@
> >  #define MAP_DPAD_TO_BUTTONS            (1 << 0)
> >  #define MAP_TRIGGERS_TO_BUTTONS                (1 << 1)
> >  #define MAP_STICKS_TO_NULL             (1 << 2)
> > +#define MAP_SHARE_BUTTON               (1 << 3)
> >  #define DANCEPAD_MAP_CONFIG    (MAP_DPAD_TO_BUTTONS
> > |                  \
> >                                 MAP_TRIGGERS_TO_BUTTONS |
> > MAP_STICKS_TO_NULL)
> >
> > @@ -130,6 +131,7 @@ static const struct xpad_device {
> >         { 0x045e, 0x02e3, "Microsoft X-Box One Elite pad", 0,
> > XTYPE_XBOXONE },
> >         { 0x045e, 0x02ea, "Microsoft X-Box One S pad", 0, XTYPE_XBOXONE
> > },
> >         { 0x045e, 0x0719, "Xbox 360 Wireless Receiver",
> > MAP_DPAD_TO_BUTTONS, XTYPE_XBOX360W },
> > +       { 0x045e, 0x0b12, "Microsoft X-Box One X pad",
> > MAP_SHARE_BUTTON, XTYPE_XBOXONE },
> >         { 0x046d, 0xc21d, "Logitech Gamepad F310", 0, XTYPE_XBOX360 },
> >         { 0x046d, 0xc21e, "Logitech Gamepad F510", 0, XTYPE_XBOX360 },
> >         { 0x046d, 0xc21f, "Logitech Gamepad F710", 0, XTYPE_XBOX360 },
> > @@ -862,6 +864,8 @@ static void xpadone_process_packet(struct usb_xpad
> > *xpad, u16 cmd, unsigned char
> >         /* menu/view buttons */
> >         input_report_key(dev, BTN_START,  data[4] & 0x04);
> >         input_report_key(dev, BTN_SELECT, data[4] & 0x08);
> > +       if (xpad->mapping & MAP_SHARE_BUTTON)
> > +               input_report_key(dev, KEY_RECORD, data[22] & 0x01);
> >
> >         /* buttons A,B,X,Y */
> >         input_report_key(dev, BTN_A,    data[4] & 0x10);
> > @@ -1669,9 +1673,12 @@ static int xpad_init_input(struct usb_xpad
> > *xpad)
> >
> >         /* set up model-specific ones */
> >         if (xpad->xtype == XTYPE_XBOX360 || xpad->xtype ==
> > XTYPE_XBOX360W ||
> > -           xpad->xtype == XTYPE_XBOXONE) {
> > +               xpad->xtype == XTYPE_XBOXONE) {
> >                 for (i = 0; xpad360_btn[i] >= 0; i++)
> >                         input_set_capability(input_dev, EV_KEY,
> > xpad360_btn[i]);
> > +               if (xpad->mapping & MAP_SHARE_BUTTON) {
> > +                       input_set_capability(input_dev, EV_KEY,
> > KEY_RECORD);
>
> Is there not a better keycode to use than "Record"? Should a "share"
> keycode be added?
>
> I couldn't find a share button in the most recent USB HID Usage Tables:
> https://www.usb.org/document-library/hid-usage-tables-121
>
> > +               }
> >         } else {
> >                 for (i = 0; xpad_btn[i] >= 0; i++)
> >                         input_set_capability(input_dev, EV_KEY,
> > xpad_btn[i]);
>
>