On Apr 11 2017 or thereabouts, Mauro Carvalho Chehab wrote:
> Some mice have a switch on their wheel, allowing to switch
> between ratchet and free wheel mode. Add support for it.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
> ---
Patches 1 to 3 are:
Acked-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Cheers,
Benjamin
> Documentation/input/event-codes.txt | 12 ++++++++++++
> include/linux/mod_devicetable.h | 2 +-
> include/uapi/linux/input-event-codes.h | 4 +++-
> 3 files changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/input/event-codes.txt b/Documentation/input/event-codes.txt
> index 50352ab5f6d4..5dbd45db9bf6 100644
> --- a/Documentation/input/event-codes.txt
> +++ b/Documentation/input/event-codes.txt
> @@ -206,6 +206,18 @@ Upon resume, if the switch state is the same as before suspend, then the input
> subsystem will filter out the duplicate switch state reports. The driver does
> not need to keep the state of the switch at any time.
>
> +A few EV_SW codes have special meanings:
> +
> +* SW_RATCHET:
> +
> + - Some mice have a special switch for their wheel that allows to change
> + between free wheel mode and ratchet mode. When the switch is ratchet
> + mode (ON state), the wheel will offer some resistance for movements. It
> + may also provide a tactile feedback when scrolled.
> +
> + Note that some mice have a ratchet switch that does not generate a
> + software event.
> +
> EV_MSC:
> ----------
> EV_MSC events are used for input and output events that do not fall under other
> diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
> index a3e8c572a046..79dd7dbf5442 100644
> --- a/include/linux/mod_devicetable.h
> +++ b/include/linux/mod_devicetable.h
> @@ -292,7 +292,7 @@ struct pcmcia_device_id {
> #define INPUT_DEVICE_ID_LED_MAX 0x0f
> #define INPUT_DEVICE_ID_SND_MAX 0x07
> #define INPUT_DEVICE_ID_FF_MAX 0x7f
> -#define INPUT_DEVICE_ID_SW_MAX 0x0f
> +#define INPUT_DEVICE_ID_SW_MAX 0x1f
>
> #define INPUT_DEVICE_ID_MATCH_BUS 1
> #define INPUT_DEVICE_ID_MATCH_VENDOR 2
> diff --git a/include/uapi/linux/input-event-codes.h b/include/uapi/linux/input-event-codes.h
> index da48d4079511..da83e231e93d 100644
> --- a/include/uapi/linux/input-event-codes.h
> +++ b/include/uapi/linux/input-event-codes.h
> @@ -789,7 +789,9 @@
> #define SW_LINEIN_INSERT 0x0d /* set = inserted */
> #define SW_MUTE_DEVICE 0x0e /* set = device disabled */
> #define SW_PEN_INSERTED 0x0f /* set = pen inserted */
> -#define SW_MAX 0x0f
> +#define SW_RATCHET 0x10 /* set = ratchet mode,
> + unset: free wheel */
> +#define SW_MAX 0x1f
> #define SW_CNT (SW_MAX+1)
>
> /*
> --
> 2.9.3
>
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