Input: add FF_HAPTIC effect type

FF_HAPTIC effect type can be used to trigger haptic feedback with HID
simple haptic usages.

Signed-off-by: Angela Czubak <[e-mail]>
Co-developed-by: Jonathan Denose <[e-mail]>
Signed-off-by: Jonathan Denose <[e-mail]>
Acked-by: Dmitry Torokhov <[e-mail]>
Signed-off-by: Benjamin Tissoires <[e-mail]>

include/uapi/linux/input.h

···
 };
 
 /**
+ * struct ff_haptic_effect
+ * @hid_usage: hid_usage according to Haptics page (WAVEFORM_CLICK, etc.)
+ * @vendor_id: the waveform vendor ID if hid_usage is in the vendor-defined range
+ * @vendor_waveform_page: the vendor waveform page if hid_usage is in the vendor-defined range
+ * @intensity: strength of the effect as percentage
+ * @repeat_count: number of times to retrigger effect
+ * @retrigger_period: time before effect is retriggered (in ms)
+ */
+struct ff_haptic_effect {
+	__u16 hid_usage;
+	__u16 vendor_id;
+	__u8  vendor_waveform_page;
+	__u16 intensity;
+	__u16 repeat_count;
+	__u16 retrigger_period;
+};
+
+/**
  * struct ff_effect - defines force feedback effect
  * @type: type of the effect (FF_CONSTANT, FF_PERIODIC, FF_RAMP, FF_SPRING,
  *	FF_FRICTION, FF_DAMPER, FF_RUMBLE, FF_INERTIA, or FF_CUSTOM)
···
 		struct ff_periodic_effect periodic;
 		struct ff_condition_effect condition[2]; /* One for each axis */
 		struct ff_rumble_effect rumble;
+		struct ff_haptic_effect haptic;
 	} u;
 };
 
···
  * Force feedback effect types
  */
 
+#define FF_HAPTIC		0x4f
 #define FF_RUMBLE	0x50
 #define FF_PERIODIC	0x51
 #define FF_CONSTANT	0x52
···
 #define FF_INERTIA	0x56
 #define FF_RAMP		0x57
 
-#define FF_EFFECT_MIN	FF_RUMBLE
+#define FF_EFFECT_MIN	FF_HAPTIC
 #define FF_EFFECT_MAX	FF_RAMP
 
 /*