HID: rmi: Support touchpads with external buttons

The external buttons on HID touchpads are connected as pass through devices and
button events are not reported in the rmi registers. As a result on these
devices we need to allow the HID generic desktop button events to be processed
by hid-input. Unfortunately, there is no way to query the touchpad to determine
that it has pass through buttons so the RMI_DEVICE_HAS_PHYS_BUTTONS should be
set manually when adding the device to rmi_id[].

Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
index 6270d2c..4bf43c8 100644 (file)
--- a/drivers/hid/hid-rmi.c
+++ b/drivers/hid/hid-rmi.c
@@ -35,6 +35,7 @@
 
 /* device flags */
 #define RMI_DEVICE                     BIT(0)
+#define RMI_DEVICE_HAS_PHYS_BUTTONS    BIT(1)
 
 enum rmi_mode_type {
        RMI_MODE_OFF                    = 0,
@@ -472,6 +473,15 @@ static int rmi_event(struct hid_device *hdev, struct hid_field *field,
        if ((data->device_flags & RMI_DEVICE) &&
            (field->application == HID_GD_POINTER ||
            field->application == HID_GD_MOUSE)) {
+               if (data->device_flags & RMI_DEVICE_HAS_PHYS_BUTTONS) {
+                       if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
+                               return 0;
+
+                       if ((usage->hid == HID_GD_X || usage->hid == HID_GD_Y)
+                           && !value)
+                               return 1;
+               }
+
                rmi_schedule_reset(hdev);
                return 1;
        }
@@ -942,8 +952,13 @@ static int rmi_input_mapping(struct hid_device *hdev,
         * we want to make HID ignore the advertised HID collection
         * for RMI deivces
         */
-       if (data->device_flags & RMI_DEVICE)
+       if (data->device_flags & RMI_DEVICE) {
+               if ((data->device_flags & RMI_DEVICE_HAS_PHYS_BUTTONS) &&
+                   ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON))
+                       return 0;
+
                return -1;
+       }
 
        return 0;
 }
@@ -991,6 +1006,9 @@ static int rmi_probe(struct hid_device *hdev, const struct hid_device_id *id)
                return ret;
        }
 
+       if (id->driver_data)
+               data->device_flags = id->driver_data;
+
        /*
         * Check for the RMI specific report ids. If they are misisng
         * simply return and let the events be processed by hid-input