@@ -2,6 +2,7 @@
* Wacom W8001 penabled serial touchscreen driver
*
* Copyright (c) 2008 Jaya Kumar
+ * Copyright (c) 2010 Red Hat, Inc.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
@@ -30,11 +31,22 @@ MODULE_LICENSE("GPL");
#define W8001_LEAD_BYTE 0x80
#define W8001_TAB_MASK 0x40
#define W8001_TAB_BYTE 0x40
+/* set in first byte of touch data packets */
+#define W8001_TOUCH_MASK (0x10 | W8001_LEAD_MASK)
+#define W8001_TOUCH_BYTE (0x10 | W8001_LEAD_BYTE)
#define W8001_QUERY_PACKET 0x20
#define W8001_CMD_START '1'
#define W8001_CMD_QUERY '*'
+#define W8001_CMD_TOUCHQUERY '%'
+
+/* length of data packets in bytes, depends on device. */
+#define W8001_PKTLEN_TOUCH93 5
+#define W8001_PKTLEN_TOUCH9A 7
+#define W8001_PKTLEN_TPCPEN 9
+#define W8001_PKTLEN_TPCCTL 11 /* control packet */
+#define W8001_PKTLEN_TOUCH2FG 13
struct w8001_coord {
u8 rdy;
@@ -48,6 +60,15 @@ struct w8001_coord {
u8 tilt_y;
};
+/* touch query reply packet */
+struct w8001_touch_query {
+ u8 panel_res;
+ u8 capacity_res;
+ u8 sensor_id;
+ u16 x;
+ u16 y;
+};
+
/*
* Per-touchscreen data.
*/
@@ -63,6 +84,7 @@ struct w8001 {
unsigned char data[W8001_MAX_LENGTH];
char phys[32];
int type;
+ unsigned int pktlen;
};
static void parse_data(u8 *data, struct w8001_coord *coord)
@@ -89,6 +111,23 @@ static void parse_data(u8 *data, struct w8001_coord *coord)
coord->tilt_y = data[8] & 0x7F;
}
+static void parse_touchquery(u8 *data, struct w8001_touch_query *query)
+{
+ memset(query, 0, sizeof(*query));
+
+ query->panel_res = data[1];
+ query->sensor_id = data[2] & 0x7;
+ query->capacity_res = data[7];
+
+ query->x = data[3] << 9;
+ query->x |= data[4] << 2;
+ query->x |= (data[2] >> 5) & 0x3;
+
+ query->y = data[5] << 9;
+ query->y |= data[6] << 2;
+ query->y |= (data[2] >> 3) & 0x3;
+}
+
static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
{
struct input_dev *dev = w8001->dev;
@@ -144,22 +183,45 @@ static irqreturn_t w8001_interrupt(struct serio *serio,
}
break;
- case 8:
+ case W8001_PKTLEN_TOUCH93 - 1:
+ case W8001_PKTLEN_TOUCH9A - 1:
+ /* ignore one-finger touch packet. */
+ if (w8001->pktlen == w8001->idx)
+ w8001->idx = 0;
+ break;
+
+ /* Pen coordinates packet */
+ case W8001_PKTLEN_TPCPEN - 1:
tmp = w8001->data[0] & W8001_TAB_MASK;
if (unlikely(tmp == W8001_TAB_BYTE))
break;
+ tmp = (w8001->data[0] & W8001_TOUCH_BYTE);
+ if (tmp == W8001_TOUCH_BYTE)
+ break;
+
w8001->idx = 0;
parse_data(w8001->data, &coord);
report_pen_events(w8001, &coord);
break;
- case 10:
+ /* control packet */
+ case W8001_PKTLEN_TPCCTL - 1:
+ tmp = (w8001->data[0] & W8001_TOUCH_MASK);
+ if (tmp == W8001_TOUCH_BYTE)
+ break;
+
w8001->idx = 0;
memcpy(w8001->response, w8001->data, W8001_MAX_LENGTH);
w8001->response_type = W8001_QUERY_PACKET;
complete(&w8001->cmd_done);
break;
+
+ case W8001_PKTLEN_TOUCH2FG - 1:
+ /* ignore two-finger touch packet. */
+ if (w8001->pktlen == w8001->idx)
+ w8001->idx = 0;
+ break;
}
return IRQ_HANDLED;
@@ -202,6 +264,28 @@ static int w8001_setup(struct w8001 *w8001)
input_set_abs_params(dev, ABS_TILT_X, 0, coord.tilt_x, 0, 0);
input_set_abs_params(dev, ABS_TILT_Y, 0, coord.tilt_y, 0, 0);
+ error = w8001_command(w8001, W8001_CMD_TOUCHQUERY, true);
+ if (!error) {
+ struct w8001_touch_query touch;
+
+ parse_touchquery(w8001->response, &touch);
+
+ switch (touch.sensor_id) {
+ case 0:
+ case 2:
+ w8001->pktlen = W8001_PKTLEN_TOUCH93;
+ break;
+ case 1:
+ case 3:
+ case 4:
+ w8001->pktlen = W8001_PKTLEN_TOUCH9A;
+ break;
+ case 5:
+ w8001->pktlen = W8001_PKTLEN_TOUCH2FG;
+ break;
+ }
+ }
+
return w8001_command(w8001, W8001_CMD_START, false);
}