Input: psmouse - add support for eGalax PS/2 touchscreen controller

Based on the touchkit USB and lifebook PS/2 touchscreen driver.

The egalax touchsreen controller (PS/2 or USB version) is used in this 7"
device: http://www.cartft.com/catalog/il/449

Signed-off-by: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

5 files changed, 139 insertions, 7 deletions

diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
index 21a1de61a79b..6751179baeb8 100644
--- a/drivers/input/mouse/Makefile
+++ b/drivers/input/mouse/Makefile
@@ -14,4 +14,5 @@ obj-$(CONFIG_MOUSE_SERIAL)	+= sermouse.o
 obj-$(CONFIG_MOUSE_HIL)         += hil_ptr.o
 obj-$(CONFIG_MOUSE_VSXXXAA)     += vsxxxaa.o
 
-psmouse-objs  := psmouse-base.o alps.o logips2pp.o synaptics.o lifebook.o trackpoint.o
+psmouse-objs  := psmouse-base.o alps.o logips2pp.o synaptics.o lifebook.o \
+                trackpoint.o touchkit_ps2.o
diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
index 0fe5869d7d4c..eb63855f7cc1 100644
--- a/drivers/input/mouse/psmouse-base.c
+++ b/drivers/input/mouse/psmouse-base.c
@@ -28,6 +28,7 @@
 #include "alps.h"
 #include "lifebook.h"
 #include "trackpoint.h"
+#include "touchkit_ps2.h"
 
 #define DRIVER_DESC     "PS/2 mouse driver"
 
@@ -605,14 +606,20 @@ static int psmouse_extensions(struct psmouse *psmouse,
                 }
         }
 
-        if (max_proto > PSMOUSE_IMEX && genius_detect(psmouse, set_properties) == 0)
-                return PSMOUSE_GENPS;
+        if (max_proto > PSMOUSE_IMEX) {
+
+                if (genius_detect(psmouse, set_properties) == 0)
+                        return PSMOUSE_GENPS;
+
+                if (ps2pp_init(psmouse, set_properties) == 0)
+                        return PSMOUSE_PS2PP;
 
-        if (max_proto > PSMOUSE_IMEX && ps2pp_init(psmouse, set_properties) == 0)
-                return PSMOUSE_PS2PP;
+                if (trackpoint_detect(psmouse, set_properties) == 0)
+                        return PSMOUSE_TRACKPOINT;
 
-        if (max_proto > PSMOUSE_IMEX && trackpoint_detect(psmouse, set_properties) == 0)
-                return PSMOUSE_TRACKPOINT;
+                if (touchkit_ps2_detect(psmouse, set_properties) == 0)
+                        return PSMOUSE_TOUCHKIT_PS2;
+        }
 
 /*
  * Reset to defaults in case the device got confused by extended
@@ -713,6 +720,12 @@ static const struct psmouse_protocol psmouse_protocols[] = {
                 .detect         = trackpoint_detect,
         },
         {
+                .type           = PSMOUSE_TOUCHKIT_PS2,
+                .name           = "touchkitPS/2",
+                .alias          = "touchkit",
+                .detect         = touchkit_ps2_detect,
+        },
+        {
                 .type           = PSMOUSE_AUTO,
                 .name           = "auto",
                 .alias          = "any",
diff --git a/drivers/input/mouse/psmouse.h b/drivers/input/mouse/psmouse.h
index cf1de95b6f27..3964e8acbc54 100644
--- a/drivers/input/mouse/psmouse.h
+++ b/drivers/input/mouse/psmouse.h
@@ -87,6 +87,7 @@ enum psmouse_type {
         PSMOUSE_ALPS,
         PSMOUSE_LIFEBOOK,
         PSMOUSE_TRACKPOINT,
+        PSMOUSE_TOUCHKIT_PS2,
         PSMOUSE_AUTO            /* This one should always be last */
 };
 
diff --git a/drivers/input/mouse/touchkit_ps2.c b/drivers/input/mouse/touchkit_ps2.c
new file mode 100644
index 000000000000..7b977fd23571
--- /dev/null
+++ b/drivers/input/mouse/touchkit_ps2.c
@@ -0,0 +1,100 @@
+/* ----------------------------------------------------------------------------
+ * touchkit_ps2.c  --  Driver for eGalax TouchKit PS/2 Touchscreens
+ *
+ * Copyright (C) 2005 by Stefan Lucke
+ * Copyright (C) 2004 by Daniel Ritz
+ * Copyright (C) by Todd E. Johnson (mtouchusb.c)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Based upon touchkitusb.c
+ *
+ * Vendor documentation is available in support section of:
+ * http://www.egalax.com.tw/
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/libps2.h>
+
+#include "psmouse.h"
+#include "touchkit_ps2.h"
+
+#define TOUCHKIT_MAX_XC                 0x07ff
+#define TOUCHKIT_MAX_YC                 0x07ff
+
+#define TOUCHKIT_CMD                    0x0a
+#define TOUCHKIT_CMD_LENGTH             1
+
+#define TOUCHKIT_CMD_ACTIVE             'A'
+#define TOUCHKIT_CMD_FIRMWARE_VERSION   'D'
+#define TOUCHKIT_CMD_CONTROLLER_TYPE    'E'
+
+#define TOUCHKIT_SEND_PARMS(s, r, c)    ((s) << 12 | (r) << 8 | (c))
+
+#define TOUCHKIT_GET_TOUCHED(packet)    (((packet)[0]) & 0x01)
+#define TOUCHKIT_GET_X(packet)          (((packet)[1] << 7) | (packet)[2])
+#define TOUCHKIT_GET_Y(packet)          (((packet)[3] << 7) | (packet)[4])
+
+static psmouse_ret_t touchkit_ps2_process_byte(struct psmouse *psmouse)
+{
+        unsigned char *packet = psmouse->packet;
+        struct input_dev *dev = psmouse->dev;
+
+        if (psmouse->pktcnt != 5)
+                return PSMOUSE_GOOD_DATA;
+
+        input_report_abs(dev, ABS_X, TOUCHKIT_GET_X(packet));
+        input_report_abs(dev, ABS_Y, TOUCHKIT_GET_Y(packet));
+        input_report_key(dev, BTN_TOUCH, TOUCHKIT_GET_TOUCHED(packet));
+        input_sync(dev);
+
+        return PSMOUSE_FULL_PACKET;
+}
+
+int touchkit_ps2_detect(struct psmouse *psmouse, int set_properties)
+{
+        struct input_dev *dev = psmouse->dev;
+        unsigned char param[3];
+        int command;
+
+        param[0] = TOUCHKIT_CMD_LENGTH;
+        param[1] = TOUCHKIT_CMD_ACTIVE;
+        command = TOUCHKIT_SEND_PARMS(2, 3, TOUCHKIT_CMD);
+
+        if (ps2_command(&psmouse->ps2dev, param, command))
+                return -ENODEV;
+
+        if (param[0] != TOUCHKIT_CMD || param[1] != 0x01 ||
+            param[2] != TOUCHKIT_CMD_ACTIVE)
+                return -ENODEV;
+
+        if (set_properties) {
+                dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
+                set_bit(BTN_TOUCH, dev->keybit);
+                input_set_abs_params(dev, ABS_X, 0, TOUCHKIT_MAX_XC, 0, 0);
+                input_set_abs_params(dev, ABS_Y, 0, TOUCHKIT_MAX_YC, 0, 0);
+
+                psmouse->vendor = "eGalax";
+                psmouse->name = "Touchscreen";
+                psmouse->protocol_handler = touchkit_ps2_process_byte;
+                psmouse->pktsize = 5;
+        }
+
+        return 0;
+}
diff --git a/drivers/input/mouse/touchkit_ps2.h b/drivers/input/mouse/touchkit_ps2.h
new file mode 100644
index 000000000000..3f03fbcaf8f0
--- /dev/null
+++ b/drivers/input/mouse/touchkit_ps2.h
@@ -0,0 +1,17 @@
+/* ----------------------------------------------------------------------------
+ * touchkit_ps2.h  --  Driver for eGalax TouchKit PS/2 Touchscreens
+ *
+ * Copyright (C) 2005 by Stefan Lucke
+ * Copyright (c) 2005 Vojtech Pavlik
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#ifndef _TOUCHKIT_PS2_H
+#define _TOUCHKIT_PS2_H
+
+int touchkit_ps2_detect(struct psmouse *psmouse, int set_properties);
+
+#endif