1 files changed, 149 insertions, 33 deletions

diff --git a/drivers/input/touchscreen/wacom_w8001.c b/drivers/input/touchscreen/wacom_w8001.c
index 8ed53aded2d3..5cb8449c909d 100644
--- a/drivers/input/touchscreen/wacom_w8001.c
+++ b/drivers/input/touchscreen/wacom_w8001.c
@@ -3,6 +3,7 @@
  *
  * Copyright (c) 2008 Jaya Kumar
  * Copyright (c) 2010 Red Hat, Inc.
+ * Copyright (c) 2010 - 2011 Ping Cheng, Wacom. <pingc@wacom.com>
  *
  * 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
@@ -64,11 +65,11 @@ struct w8001_coord {
 
 /* touch query reply packet */
 struct w8001_touch_query {
+        u16 x;
+        u16 y;
         u8 panel_res;
         u8 capacity_res;
         u8 sensor_id;
-        u16 x;
-        u16 y;
 };
 
 /*
@@ -87,9 +88,14 @@ struct w8001 {
         char phys[32];
         int type;
         unsigned int pktlen;
+        u16 max_touch_x;
+        u16 max_touch_y;
+        u16 max_pen_x;
+        u16 max_pen_y;
+        char name[64];
 };
 
-static void parse_data(u8 *data, struct w8001_coord *coord)
+static void parse_pen_data(u8 *data, struct w8001_coord *coord)
 {
         memset(coord, 0, sizeof(*coord));
 
@@ -113,11 +119,30 @@ static void parse_data(u8 *data, struct w8001_coord *coord)
         coord->tilt_y = data[8] & 0x7F;
 }
 
-static void parse_touch(struct w8001 *w8001)
+static void parse_single_touch(u8 *data, struct w8001_coord *coord)
+{
+        coord->x = (data[1] << 7) | data[2];
+        coord->y = (data[3] << 7) | data[4];
+        coord->tsw = data[0] & 0x01;
+}
+
+static void scale_touch_coordinates(struct w8001 *w8001,
+                                    unsigned int *x, unsigned int *y)
+{
+        if (w8001->max_pen_x && w8001->max_touch_x)
+                *x = *x * w8001->max_pen_x / w8001->max_touch_x;
+
+        if (w8001->max_pen_y && w8001->max_touch_y)
+                *y = *y * w8001->max_pen_y / w8001->max_touch_y;
+}
+
+static void parse_multi_touch(struct w8001 *w8001)
 {
         struct input_dev *dev = w8001->dev;
         unsigned char *data = w8001->data;
+        unsigned int x, y;
         int i;
+        int count = 0;
 
         for (i = 0; i < 2; i++) {
                 bool touch = data[0] & (1 << i);
@@ -125,15 +150,29 @@ static void parse_touch(struct w8001 *w8001)
                 input_mt_slot(dev, i);
                 input_mt_report_slot_state(dev, MT_TOOL_FINGER, touch);
                 if (touch) {
-                        int x = (data[6 * i + 1] << 7) | (data[6 * i + 2]);
-                        int y = (data[6 * i + 3] << 7) | (data[6 * i + 4]);
+                        x = (data[6 * i + 1] << 7) | data[6 * i + 2];
+                        y = (data[6 * i + 3] << 7) | data[6 * i + 4];
                         /* data[5,6] and [11,12] is finger capacity */
 
+                        /* scale to pen maximum */
+                        scale_touch_coordinates(w8001, &x, &y);
+
                         input_report_abs(dev, ABS_MT_POSITION_X, x);
                         input_report_abs(dev, ABS_MT_POSITION_Y, y);
+                        count++;
                 }
         }
 
+        /* emulate single touch events when stylus is out of proximity.
+         * This is to make single touch backward support consistent
+         * across all Wacom single touch devices.
+         */
+        if (w8001->type != BTN_TOOL_PEN &&
+                            w8001->type != BTN_TOOL_RUBBER) {
+                w8001->type = count == 1 ? BTN_TOOL_FINGER : KEY_RESERVED;
+                input_mt_report_pointer_emulation(dev, true);
+        }
+
         input_sync(dev);
 }
 
@@ -152,6 +191,15 @@ static void parse_touchquery(u8 *data, struct w8001_touch_query *query)
         query->y = data[5] << 9;
         query->y |= data[6] << 2;
         query->y |= (data[2] >> 3) & 0x3;
+
+        /* Early days' single-finger touch models need the following defaults */
+        if (!query->x && !query->y) {
+                query->x = 1024;
+                query->y = 1024;
+                if (query->panel_res)
+                        query->x = query->y = (1 << query->panel_res);
+                query->panel_res = 10;
+        }
 }
 
 static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
@@ -161,16 +209,15 @@ static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
         /*
          * We have 1 bit for proximity (rdy) and 3 bits for tip, side,
          * side2/eraser. If rdy && f2 are set, this can be either pen + side2,
-         * or eraser. assume
+         * or eraser. Assume:
          * - if dev is already in proximity and f2 is toggled → pen + side2
          * - if dev comes into proximity with f2 set → eraser
          * If f2 disappears after assuming eraser, fake proximity out for
          * eraser and in for pen.
          */
 
-        if (!w8001->type) {
-                w8001->type = coord->f2 ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
-        } else if (w8001->type == BTN_TOOL_RUBBER) {
+        switch (w8001->type) {
+        case BTN_TOOL_RUBBER:
                 if (!coord->f2) {
                         input_report_abs(dev, ABS_PRESSURE, 0);
                         input_report_key(dev, BTN_TOUCH, 0);
@@ -180,8 +227,21 @@ static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
                         input_sync(dev);
                         w8001->type = BTN_TOOL_PEN;
                 }
-        } else {
+                break;
+
+        case BTN_TOOL_FINGER:
+                input_report_key(dev, BTN_TOUCH, 0);
+                input_report_key(dev, BTN_TOOL_FINGER, 0);
+                input_sync(dev);
+                /* fall through */
+
+        case KEY_RESERVED:
+                w8001->type = coord->f2 ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
+                break;
+
+        default:
                 input_report_key(dev, BTN_STYLUS2, coord->f2);
+                break;
         }
 
         input_report_abs(dev, ABS_X, coord->x);
@@ -193,7 +253,26 @@ static void report_pen_events(struct w8001 *w8001, struct w8001_coord *coord)
         input_sync(dev);
 
         if (!coord->rdy)
-                w8001->type = 0;
+                w8001->type = KEY_RESERVED;
+}
+
+static void report_single_touch(struct w8001 *w8001, struct w8001_coord *coord)
+{
+        struct input_dev *dev = w8001->dev;
+        unsigned int x = coord->x;
+        unsigned int y = coord->y;
+
+        /* scale to pen maximum */
+        scale_touch_coordinates(w8001, &x, &y);
+
+        input_report_abs(dev, ABS_X, x);
+        input_report_abs(dev, ABS_Y, y);
+        input_report_key(dev, BTN_TOUCH, coord->tsw);
+        input_report_key(dev, BTN_TOOL_FINGER, coord->tsw);
+
+        input_sync(dev);
+
+        w8001->type = coord->tsw ? BTN_TOOL_FINGER : KEY_RESERVED;
 }
 
 static irqreturn_t w8001_interrupt(struct serio *serio,
@@ -214,9 +293,18 @@ static irqreturn_t w8001_interrupt(struct serio *serio,
 
         case W8001_PKTLEN_TOUCH93 - 1:
         case W8001_PKTLEN_TOUCH9A - 1:
-                /* ignore one-finger touch packet. */
-                if (w8001->pktlen == w8001->idx)
+                tmp = w8001->data[0] & W8001_TOUCH_BYTE;
+                if (tmp != W8001_TOUCH_BYTE)
+                        break;
+
+                if (w8001->pktlen == w8001->idx) {
                         w8001->idx = 0;
+                        if (w8001->type != BTN_TOOL_PEN &&
+                            w8001->type != BTN_TOOL_RUBBER) {
+                                parse_single_touch(w8001->data, &coord);
+                                report_single_touch(w8001, &coord);
+                        }
+                }
                 break;
 
         /* Pen coordinates packet */
@@ -225,18 +313,18 @@ static irqreturn_t w8001_interrupt(struct serio *serio,
                 if (unlikely(tmp == W8001_TAB_BYTE))
                         break;
 
-                tmp = (w8001->data[0] & W8001_TOUCH_BYTE);
+                tmp = w8001->data[0] & W8001_TOUCH_BYTE;
                 if (tmp == W8001_TOUCH_BYTE)
                         break;
 
                 w8001->idx = 0;
-                parse_data(w8001->data, &coord);
+                parse_pen_data(w8001->data, &coord);
                 report_pen_events(w8001, &coord);
                 break;
 
         /* control packet */
         case W8001_PKTLEN_TPCCTL - 1:
-                tmp = (w8001->data[0] & W8001_TOUCH_MASK);
+                tmp = w8001->data[0] & W8001_TOUCH_MASK;
                 if (tmp == W8001_TOUCH_BYTE)
                         break;
 
@@ -249,7 +337,7 @@ static irqreturn_t w8001_interrupt(struct serio *serio,
         /* 2 finger touch packet */
         case W8001_PKTLEN_TOUCH2FG - 1:
                 w8001->idx = 0;
-                parse_touch(w8001);
+                parse_multi_touch(w8001);
                 break;
         }
 
@@ -279,6 +367,7 @@ static int w8001_setup(struct w8001 *w8001)
 {
         struct input_dev *dev = w8001->dev;
         struct w8001_coord coord;
+        struct w8001_touch_query touch;
         int error;
 
         error = w8001_command(w8001, W8001_CMD_STOP, false);
@@ -287,14 +376,21 @@ static int w8001_setup(struct w8001 *w8001)
 
         msleep(250);    /* wait 250ms before querying the device */
 
+        dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+        strlcat(w8001->name, "Wacom Serial", sizeof(w8001->name));
+
         /* penabled? */
         error = w8001_command(w8001, W8001_CMD_QUERY, true);
         if (!error) {
+                __set_bit(BTN_TOUCH, dev->keybit);
                 __set_bit(BTN_TOOL_PEN, dev->keybit);
                 __set_bit(BTN_TOOL_RUBBER, dev->keybit);
                 __set_bit(BTN_STYLUS, dev->keybit);
                 __set_bit(BTN_STYLUS2, dev->keybit);
-                parse_data(w8001->response, &coord);
+
+                parse_pen_data(w8001->response, &coord);
+                w8001->max_pen_x = coord.x;
+                w8001->max_pen_y = coord.y;
 
                 input_set_abs_params(dev, ABS_X, 0, coord.x, 0, 0);
                 input_set_abs_params(dev, ABS_Y, 0, coord.y, 0, 0);
@@ -303,6 +399,8 @@ 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);
                 }
+                w8001->id = 0x90;
+                strlcat(w8001->name, " Penabled", sizeof(w8001->name));
         }
 
         /* Touch enabled? */
@@ -313,24 +411,38 @@ static int w8001_setup(struct w8001 *w8001)
          * second byte is empty, which indicates touch is not supported.
          */
         if (!error && w8001->response[1]) {
-                struct w8001_touch_query touch;
+                __set_bit(BTN_TOUCH, dev->keybit);
+                __set_bit(BTN_TOOL_FINGER, dev->keybit);
 
                 parse_touchquery(w8001->response, &touch);
+                w8001->max_touch_x = touch.x;
+                w8001->max_touch_y = touch.y;
+
+                /* scale to pen maximum */
+                if (w8001->max_pen_x && w8001->max_pen_y) {
+                        touch.x = w8001->max_pen_x;
+                        touch.y = w8001->max_pen_y;
+                }
 
                 input_set_abs_params(dev, ABS_X, 0, touch.x, 0, 0);
                 input_set_abs_params(dev, ABS_Y, 0, touch.y, 0, 0);
-                __set_bit(BTN_TOOL_FINGER, dev->keybit);
 
                 switch (touch.sensor_id) {
                 case 0:
                 case 2:
                         w8001->pktlen = W8001_PKTLEN_TOUCH93;
+                        w8001->id = 0x93;
+                        strlcat(w8001->name, " 1FG", sizeof(w8001->name));
                         break;
+
                 case 1:
                 case 3:
                 case 4:
                         w8001->pktlen = W8001_PKTLEN_TOUCH9A;
+                        strlcat(w8001->name, " 1FG", sizeof(w8001->name));
+                        w8001->id = 0x9a;
                         break;
+
                 case 5:
                         w8001->pktlen = W8001_PKTLEN_TOUCH2FG;
 
@@ -341,10 +453,18 @@ static int w8001_setup(struct w8001 *w8001)
                                                 0, touch.y, 0, 0);
                         input_set_abs_params(dev, ABS_MT_TOOL_TYPE,
                                                 0, MT_TOOL_MAX, 0, 0);
+
+                        strlcat(w8001->name, " 2FG", sizeof(w8001->name));
+                        if (w8001->max_pen_x && w8001->max_pen_y)
+                                w8001->id = 0xE3;
+                        else
+                                w8001->id = 0xE2;
                         break;
                 }
         }
 
+        strlcat(w8001->name, " Touchscreen", sizeof(w8001->name));
+
         return w8001_command(w8001, W8001_CMD_START, false);
 }
 
@@ -384,22 +504,10 @@ static int w8001_connect(struct serio *serio, struct serio_driver *drv)
         }
 
         w8001->serio = serio;
-        w8001->id = serio->id.id;
         w8001->dev = input_dev;
         init_completion(&w8001->cmd_done);
         snprintf(w8001->phys, sizeof(w8001->phys), "%s/input0", serio->phys);
 
-        input_dev->name = "Wacom W8001 Penabled Serial TouchScreen";
-        input_dev->phys = w8001->phys;
-        input_dev->id.bustype = BUS_RS232;
-        input_dev->id.vendor = SERIO_W8001;
-        input_dev->id.product = w8001->id;
-        input_dev->id.version = 0x0100;
-        input_dev->dev.parent = &serio->dev;
-
-        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
-        __set_bit(BTN_TOUCH, input_dev->keybit);
-
         serio_set_drvdata(serio, w8001);
         err = serio_open(serio, drv);
         if (err)
@@ -409,6 +517,14 @@ static int w8001_connect(struct serio *serio, struct serio_driver *drv)
         if (err)
                 goto fail3;
 
+        input_dev->name = w8001->name;
+        input_dev->phys = w8001->phys;
+        input_dev->id.product = w8001->id;
+        input_dev->id.bustype = BUS_RS232;
+        input_dev->id.vendor = 0x056a;
+        input_dev->id.version = 0x0100;
+        input_dev->dev.parent = &serio->dev;
+
         err = input_register_device(w8001->dev);
         if (err)
                 goto fail3;