Re: [PATCH] HID: rmi: Add support for the touchpad in the Razer Blade 14 laptop

[Andrew Duggan <aduggan@synaptics.com>]

On 11/24/2014 04:20 PM, Andrew Duggan wrote:
> The Razer Blade 14 has a Synaptic's TouchPad on one of the interfaces of
> a composite USB device. This patch allows the hid-rmi driver to bind
> to that interface. It also adds support for the external click buttons
> on the Razer's touchpad. External buttons are reported using generic
> mouse reports instead of through the F30 like it is on ClickPads.
>
> Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
> ---
> This patch depends on the "HID: rmi: Scan the report descriptor to determine if the device is
> suitable for the hid-rmi driver" I submitted earlier today to correctly bind to the touchpad HID
> device in the composite USB device.
Any comments on this patch?

Thanks,
Andrew
>   drivers/hid/hid-core.c |  4 +++-
>   drivers/hid/hid-ids.h  |  3 +++
>   drivers/hid/hid-rmi.c  | 15 ++++++++++++++-
>   3 files changed, 20 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
> index ba9dc59..d69ea16 100644
> --- a/drivers/hid/hid-core.c
> +++ b/drivers/hid/hid-core.c
> @@ -792,7 +792,9 @@ static int hid_scan_report(struct hid_device *hid)
>   	/*
>   	* Vendor specific handlings
>   	*/
> -	if ((hid->vendor == USB_VENDOR_ID_SYNAPTICS) &&
> +	if ((hid->vendor == USB_VENDOR_ID_SYNAPTICS
> +	    || (hid->vendor == USB_VENDOR_ID_RAZER
> +	    && hid->product == USB_DEVICE_ID_RAZER_BLADE_14)) &&
>   	    (hid->group == HID_GROUP_GENERIC)) {
>   		if ((parser->scan_flags & HID_SCAN_FLAG_VENDOR_SPECIFIC)
>   		    && (parser->scan_flags & HID_SCAN_FLAG_GENDESK_POINTER))
> diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
> index 25cd674..c677aad 100644
> --- a/drivers/hid/hid-ids.h
> +++ b/drivers/hid/hid-ids.h
> @@ -751,6 +751,9 @@
>   #define USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3001		0x3001
>   #define USB_DEVICE_ID_QUANTA_OPTICAL_TOUCH_3008		0x3008
>   
> +#define USB_VENDOR_ID_RAZER		0x1532
> +#define USB_DEVICE_ID_RAZER_BLADE_14	0x011D
> +
>   #define USB_VENDOR_ID_REALTEK		0x0bda
>   #define USB_DEVICE_ID_REALTEK_READER	0x0152
>   
> diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
> index 3cccff7..1f131df 100644
> --- a/drivers/hid/hid-rmi.c
> +++ b/drivers/hid/hid-rmi.c
> @@ -453,7 +453,15 @@ static int rmi_raw_event(struct hid_device *hdev,
>   	case RMI_ATTN_REPORT_ID:
>   		return rmi_input_event(hdev, data, size);
>   	case RMI_MOUSE_REPORT_ID:
> -		rmi_schedule_reset(hdev);
> +		/*
> +		 * touchpads with physical mouse buttons will report those
> +		 * buttons in mouse reports even in RMI mode. Only reset
> +		 * the device if we see reports which contain X or Y data.
> +		 */
> +		if (data[2] != 0 || data[3] != 0)
> +			rmi_schedule_reset(hdev);
> +		else
> +			return 1;
>   		break;
>   	}
>   
> @@ -871,6 +879,11 @@ static int rmi_input_mapping(struct hid_device *hdev,
>   		struct hid_input *hi, struct hid_field *field,
>   		struct hid_usage *usage, unsigned long **bit, int *max)
>   {
> +	if (field->application == HID_GD_POINTER
> +		&& (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
> +		/* Pass mouse button reports to generic code for processing */
> +		return 0;
> +
>   	/* we want to make HID ignore the advertised HID collection */
>   	return -1;
>   }