Re: [PATCH 3/5] Input: xpad - send rumble on Xbox One init to fix PowerA pads

[Dmitry Torokhov]

On Sat, Feb 04, 2017 at 04:30:00PM -0800, Cameron Gutman wrote:
> Some PowerA pads require a rumble packet to start sending
> input reports.
> 
> Signed-off-by: Cameron Gutman <aicomman...@gmail.com>
> ---
>  drivers/input/joystick/xpad.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/input/joystick/xpad.c b/drivers/input/joystick/xpad.c
> index 3f19f32b..13f298d 100644
> --- a/drivers/input/joystick/xpad.c
> +++ b/drivers/input/joystick/xpad.c
> @@ -358,6 +358,13 @@ static const struct xpad_output_packet xone_init_pkt[] = 
> {
>        * or later firmware installed (or present from the factory).
>        */
>       {{0x05, 0x20, 0x00, 0x01, 0x00}, 5, true},
> +
> +     /*
> +      * A rumble packet is required for some PowerA pads to start
> +      * sending input reports. One of those pads is (0x24c6:0x543a).
> +      */
> +     {{0x09, 0x00, 0x00, 0x09, 0x00, 0x0F, 0x00, 0x00,
> +       0x00, 0x00, 0x00, 0x00, 0x00}, 13, true},

I am uncomfortable with us just blasting random commands to random
controllers. Can we make it device-dependent. I.e:

struct xboxone_init_packet = {
        u16 idVendor;
        u16 idProduct;
        const u8 *data;
        size_t len;
};

static const u8 xboxone_powera_init[] = {
        0x09, 0x00, 0x00, 0x09, 0x00, 0x0F, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00
};

#define XBOXONE_INIT_PKT(_vid, _pid, _data)             \
        {                                               \
                .idVendor       = (_vid),               \
                .idProduct      = (_pid),               \
                .data           = (_data),              \
                .len            = ARRAY_SIZE(data),     \
        }
...

static const struct xboxone_init_packet xboxone_init_packets[] = {
        ...
        XBOXONE_INIT_PKT(0x24c6, 0x543a, xboxone_powera_init),
        ...

With 0/0 VID/PID being "catch all" entry.

BTW, why do we set "pending" on these ones? I do not think it is needed.

Thanks.

-- 
Dmitry