input/mouse/focaltech.c

55 #define FOC_ABS 0x6 /* absolute position of one finger */
61  * Current state of a single finger on the touchpad.
64 	/* The touchpad has generated a touch event for the finger */
68 	 * The touchpad has sent position data for the finger. The
69 	 * flag is 0 when the finger is not active, and there is a
70 	 * time between the first touch event for the finger and the
71 	 * following absolute position packet for the finger where the
72 	 * touchpad has declared the finger to be valid, but we do not
79 	 * finger.
91 	 * the array indices correspond to the finger indices returned
98 	 * 15 value stays until the finger is released.
100 	 * Since hardware reports width only for last touching finger,
101 	 * there is no need to store width for every specific finger,
123 		struct focaltech_finger_state *finger = &state->fingers[i];
124 		bool active = finger->active && finger->valid;
135 			clamped_x = clamp(finger->x, 0U, priv->x_max);
136 			clamped_y = clamp(finger->y, 0U, priv->y_max);
164 			 * Even when the finger becomes active again, we still
178 	unsigned int finger;
180 	finger = (packet[1] >> 4) - 1;
181 	if (finger >= FOC_MAX_FINGERS) {
182 		psmouse_err(psmouse, "Invalid finger in abs packet: %d\n",
183 			    finger);
189 	state->fingers[finger].x = ((packet[1] & 0xf) << 8) | packet[2];
190 	state->fingers[finger].y = (packet[3] << 8) | packet[4];
192 	state->fingers[finger].valid = true;
208 		psmouse_err(psmouse, "First finger in rel packet invalid: %d\n",
214 	 * packet only contains one finger. In this case, the second
215 	 * finger index in the packet is 0 (we subtract 1 in the lines
216 	 * above to create array indices, so the finger will overflow