6 files changed, 756 insertions, 34 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index b1b14f8d4dd6..9418bbe47072 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -108,4 +108,40 @@ config TOUCHSCREEN_HP600
           To compile this driver as a module, choose M here: the
           module will be called hp680_ts_input.
 
+config TOUCHSCREEN_PENMOUNT
+        tristate "Penmount serial touchscreen"
+        select SERIO
+        help
+          Say Y here if you have a Penmount serial touchscreen connected to
+          your system.
+
+          If unsure, say N.
+
+          To compile this driver as a module, choose M here: the
+          module will be called penmount.
+
+config TOUCHSCREEN_TOUCHRIGHT
+        tristate "Touchright serial touchscreen"
+        select SERIO
+        help
+          Say Y here if you have a Touchright serial touchscreen connected to
+          your system.
+
+          If unsure, say N.
+
+          To compile this driver as a module, choose M here: the
+          module will be called touchright.
+
+config TOUCHSCREEN_TOUCHWIN
+        tristate "Touchwin serial touchscreen"
+        select SERIO
+        help
+          Say Y here if you have a Touchwin serial touchscreen connected to
+          your system.
+
+          If unsure, say N.
+
+          To compile this driver as a module, choose M here: the
+          module will be called touchwin.
+
 endif
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 5e5557c43121..1abb8f10d608 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -12,3 +12,6 @@ obj-$(CONFIG_TOUCHSCREEN_ELO)	+= elo.o
 obj-$(CONFIG_TOUCHSCREEN_MTOUCH) += mtouch.o
 obj-$(CONFIG_TOUCHSCREEN_MK712) += mk712.o
 obj-$(CONFIG_TOUCHSCREEN_HP600) += hp680_ts_input.o
+obj-$(CONFIG_TOUCHSCREEN_PENMOUNT)      += penmount.o
+obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT)    += touchright.o
+obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN)      += touchwin.o
diff --git a/drivers/input/touchscreen/elo.c b/drivers/input/touchscreen/elo.c
index c86a2eb310fd..ab565335ee44 100644
--- a/drivers/input/touchscreen/elo.c
+++ b/drivers/input/touchscreen/elo.c
@@ -23,6 +23,7 @@
 #include <linux/input.h>
 #include <linux/serio.h>
 #include <linux/init.h>
+#include <linux/ctype.h>
 
 #define DRIVER_DESC     "Elo serial touchscreen driver"
 
@@ -34,7 +35,19 @@ MODULE_LICENSE("GPL");
  * Definitions & global arrays.
  */
 
-#define ELO_MAX_LENGTH  10
+#define ELO_MAX_LENGTH          10
+
+#define ELO10_PACKET_LEN        8
+#define ELO10_TOUCH             0x03
+#define ELO10_PRESSURE          0x80
+
+#define ELO10_LEAD_BYTE         'U'
+
+#define ELO10_ID_CMD            'i'
+
+#define ELO10_TOUCH_PACKET      'T'
+#define ELO10_ACK_PACKET        'A'
+#define ELI10_ID_PACKET         'I'
 
 /*
  * Per-touchscreen data.
@@ -43,51 +56,67 @@ MODULE_LICENSE("GPL");
 struct elo {
         struct input_dev *dev;
         struct serio *serio;
+        struct mutex cmd_mutex;
+        struct completion cmd_done;
         int id;
         int idx;
+        unsigned char expected_packet;
         unsigned char csum;
         unsigned char data[ELO_MAX_LENGTH];
+        unsigned char response[ELO10_PACKET_LEN];
         char phys[32];
 };
 
-static void elo_process_data_10(struct elo* elo, unsigned char data, struct pt_regs *regs)
+static void elo_process_data_10(struct elo *elo, unsigned char data, struct pt_regs *regs)
 {
         struct input_dev *dev = elo->dev;
 
-        elo->csum += elo->data[elo->idx] = data;
-
+        elo->data[elo->idx] = data;
         switch (elo->idx++) {
-
                 case 0:
-                        if (data != 'U') {
+                        elo->csum = 0xaa;
+                        if (data != ELO10_LEAD_BYTE) {
+                                pr_debug("elo: unsynchronized data: 0x%02x\n", data);
                                 elo->idx = 0;
-                                elo->csum = 0;
-                        }
-                        break;
-
-                case 1:
-                        if (data != 'T') {
-                                elo->idx = 0;
-                                elo->csum = 0;
                         }
                         break;
 
                 case 9:
-                        if (elo->csum) {
+                        elo->idx = 0;
+                        if (data != elo->csum) {
+                                pr_debug("elo: bad checksum: 0x%02x, expected 0x%02x\n",
+                                         data, elo->csum);
+                                break;
+                        }
+                        if (elo->data[1] != elo->expected_packet) {
+                                if (elo->data[1] != ELO10_TOUCH_PACKET)
+                                        pr_debug("elo: unexpected packet: 0x%02x\n",
+                                                 elo->data[1]);
+                                break;
+                        }
+                        if (likely(elo->data[1] == ELO10_TOUCH_PACKET)) {
                                 input_regs(dev, regs);
                                 input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]);
                                 input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]);
-                                input_report_abs(dev, ABS_PRESSURE, (elo->data[8] << 8) | elo->data[7]);
-                                input_report_key(dev, BTN_TOUCH, elo->data[8] || elo->data[7]);
+                                if (elo->data[2] & ELO10_PRESSURE)
+                                        input_report_abs(dev, ABS_PRESSURE,
+                                                        (elo->data[8] << 8) | elo->data[7]);
+                                input_report_key(dev, BTN_TOUCH, elo->data[2] & ELO10_TOUCH);
                                 input_sync(dev);
+                        } else if (elo->data[1] == ELO10_ACK_PACKET) {
+                                if (elo->data[2] == '0')
+                                        elo->expected_packet = ELO10_TOUCH_PACKET;
+                                complete(&elo->cmd_done);
+                        } else {
+                                memcpy(elo->response, &elo->data[1], ELO10_PACKET_LEN);
+                                elo->expected_packet = ELO10_ACK_PACKET;
                         }
-                        elo->idx = 0;
-                        elo->csum = 0;
                         break;
         }
+        elo->csum += data;
 }
 
-static void elo_process_data_6(struct elo* elo, unsigned char data, struct pt_regs *regs)
+static void elo_process_data_6(struct elo *elo, unsigned char data, struct pt_regs *regs)
 {
         struct input_dev *dev = elo->dev;
 
@@ -135,7 +164,7 @@ static void elo_process_data_6(struct elo* elo, unsigned char data, struct pt_re
         }
 }
 
-static void elo_process_data_3(struct elo* elo, unsigned char data, struct pt_regs *regs)
+static void elo_process_data_3(struct elo *elo, unsigned char data, struct pt_regs *regs)
 {
         struct input_dev *dev = elo->dev;
 
@@ -161,7 +190,7 @@ static void elo_process_data_3(struct elo* elo, unsigned char data, struct pt_re
 static irqreturn_t elo_interrupt(struct serio *serio,
                 unsigned char data, unsigned int flags, struct pt_regs *regs)
 {
-        struct elo* elo = serio_get_drvdata(serio);
+        struct elo *elo = serio_get_drvdata(serio);
 
         switch(elo->id) {
                 case 0:
@@ -181,17 +210,81 @@ static irqreturn_t elo_interrupt(struct serio *serio,
         return IRQ_HANDLED;
 }
 
+static int elo_command_10(struct elo *elo, unsigned char *packet)
+{
+        int rc = -1;
+        int i;
+        unsigned char csum = 0xaa + ELO10_LEAD_BYTE;
+
+        mutex_lock(&elo->cmd_mutex);
+
+        serio_pause_rx(elo->serio);
+        elo->expected_packet = toupper(packet[0]);
+        init_completion(&elo->cmd_done);
+        serio_continue_rx(elo->serio);
+
+        if (serio_write(elo->serio, ELO10_LEAD_BYTE))
+                goto out;
+
+        for (i = 0; i < ELO10_PACKET_LEN; i++) {
+                csum += packet[i];
+                if (serio_write(elo->serio, packet[i]))
+                        goto out;
+        }
+
+        if (serio_write(elo->serio, csum))
+                goto out;
+
+        wait_for_completion_timeout(&elo->cmd_done, HZ);
+
+        if (elo->expected_packet == ELO10_TOUCH_PACKET) {
+                /* We are back in reporting mode, the command was ACKed */
+                memcpy(packet, elo->response, ELO10_PACKET_LEN);
+                rc = 0;
+        }
+
+ out:
+        mutex_unlock(&elo->cmd_mutex);
+        return rc;
+}
+
+static int elo_setup_10(struct elo *elo)
+{
+        static const char *elo_types[] = { "Accu", "Dura", "Intelli", "Carroll" };
+        struct input_dev *dev = elo->dev;
+        unsigned char packet[ELO10_PACKET_LEN] = { ELO10_ID_CMD };
+
+        if (elo_command_10(elo, packet))
+                return -1;
+
+        dev->id.version = (packet[5] << 8) | packet[4];
+
+        input_set_abs_params(dev, ABS_X, 96, 4000, 0, 0);
+        input_set_abs_params(dev, ABS_Y, 96, 4000, 0, 0);
+        if (packet[3] & ELO10_PRESSURE)
+                input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
+
+        printk(KERN_INFO "elo: %sTouch touchscreen, fw: %02x.%02x, "
+                "features: %x02x, controller: 0x%02x\n",
+                elo_types[(packet[1] -'0') & 0x03],
+                packet[5], packet[4], packet[3], packet[7]);
+
+        return 0;
+}
+
 /*
  * elo_disconnect() is the opposite of elo_connect()
  */
 
 static void elo_disconnect(struct serio *serio)
 {
-        struct elo* elo = serio_get_drvdata(serio);
+        struct elo *elo = serio_get_drvdata(serio);
 
+        input_get_device(elo->dev);
         input_unregister_device(elo->dev);
         serio_close(serio);
         serio_set_drvdata(serio, NULL);
+        input_put_device(elo->dev);
         kfree(elo);
 }
 
@@ -211,12 +304,15 @@ static int elo_connect(struct serio *serio, struct serio_driver *drv)
         input_dev = input_allocate_device();
         if (!elo || !input_dev) {
                 err = -ENOMEM;
-                goto fail;
+                goto fail1;
         }
 
         elo->serio = serio;
         elo->id = serio->id.id;
         elo->dev = input_dev;
+        elo->expected_packet = ELO10_TOUCH_PACKET;
+        mutex_init(&elo->cmd_mutex);
+        init_completion(&elo->cmd_done);
         snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys);
 
         input_dev->private = elo;
@@ -231,12 +327,17 @@ static int elo_connect(struct serio *serio, struct serio_driver *drv)
         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
         input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
 
+        serio_set_drvdata(serio, elo);
+        err = serio_open(serio, drv);
+        if (err)
+                goto fail2;
+
         switch (elo->id) {
 
                 case 0: /* 10-byte protocol */
-                        input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
-                        input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
-                        input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0);
+                        if (elo_setup_10(elo))
+                                goto fail3;
+
                         break;
 
                 case 1: /* 6-byte protocol */
@@ -253,17 +354,15 @@ static int elo_connect(struct serio *serio, struct serio_driver *drv)
                         break;
         }
 
-        serio_set_drvdata(serio, elo);
-
-        err = serio_open(serio, drv);
+        err = input_register_device(elo->dev);
         if (err)
-                goto fail;
+                goto fail3;
 
-        input_register_device(elo->dev);
         return 0;
 
- fail:  serio_set_drvdata(serio, NULL);
-        input_free_device(input_dev);
+ fail3: serio_close(serio);
+ fail2: serio_set_drvdata(serio, NULL);
+ fail1: input_free_device(input_dev);
         kfree(elo);
         return err;
 }
diff --git a/drivers/input/touchscreen/penmount.c b/drivers/input/touchscreen/penmount.c
new file mode 100644
index 000000000000..f7370109d43e
--- /dev/null
+++ b/drivers/input/touchscreen/penmount.c
@@ -0,0 +1,185 @@
+/*
+ * Penmount serial touchscreen driver
+ *
+ * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
+ *
+ * Based on ELO driver (drivers/input/touchscreen/elo.c)
+ * Copyright (c) 2004 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.
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/init.h>
+
+#define DRIVER_DESC     "Penmount serial touchscreen driver"
+
+MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * Definitions & global arrays.
+ */
+
+#define PM_MAX_LENGTH   5
+
+/*
+ * Per-touchscreen data.
+ */
+
+struct pm {
+        struct input_dev *dev;
+        struct serio *serio;
+        int idx;
+        unsigned char data[PM_MAX_LENGTH];
+        char phys[32];
+};
+
+static irqreturn_t pm_interrupt(struct serio *serio,
+                unsigned char data, unsigned int flags, struct pt_regs *regs)
+{
+        struct pm *pm = serio_get_drvdata(serio);
+        struct input_dev *dev = pm->dev;
+
+        pm->data[pm->idx] = data;
+
+        if (pm->data[0] & 0x80) {
+                if (PM_MAX_LENGTH == ++pm->idx) {
+                        input_regs(dev, regs);
+                        input_report_abs(dev, ABS_X, pm->data[2] * 128 + pm->data[1]);
+                        input_report_abs(dev, ABS_Y, pm->data[4] * 128 + pm->data[3]);
+                        input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40));
+                        input_sync(dev);
+                        pm->idx = 0;
+                }
+        }
+
+        return IRQ_HANDLED;
+}
+
+/*
+ * pm_disconnect() is the opposite of pm_connect()
+ */
+
+static void pm_disconnect(struct serio *serio)
+{
+        struct pm *pm = serio_get_drvdata(serio);
+
+        input_get_device(pm->dev);
+        input_unregister_device(pm->dev);
+        serio_close(serio);
+        serio_set_drvdata(serio, NULL);
+        input_put_device(pm->dev);
+        kfree(pm);
+}
+
+/*
+ * pm_connect() is the routine that is called when someone adds a
+ * new serio device that supports Gunze protocol and registers it as
+ * an input device.
+ */
+
+static int pm_connect(struct serio *serio, struct serio_driver *drv)
+{
+        struct pm *pm;
+        struct input_dev *input_dev;
+        int err;
+
+        pm = kzalloc(sizeof(struct pm), GFP_KERNEL);
+        input_dev = input_allocate_device();
+        if (!pm || !input_dev) {
+                err = -ENOMEM;
+                goto fail1;
+        }
+
+        pm->serio = serio;
+        pm->dev = input_dev;
+        snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys);
+
+        input_dev->private = pm;
+        input_dev->name = "Penmount Serial TouchScreen";
+        input_dev->phys = pm->phys;
+        input_dev->id.bustype = BUS_RS232;
+        input_dev->id.vendor = SERIO_PENMOUNT;
+        input_dev->id.product = 0;
+        input_dev->id.version = 0x0100;
+        input_dev->cdev.dev = &serio->dev;
+
+        input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
+        input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
+        input_set_abs_params(pm->dev, ABS_X, 0, 0x3ff, 0, 0);
+        input_set_abs_params(pm->dev, ABS_Y, 0, 0x3ff, 0, 0);
+
+        serio_set_drvdata(serio, pm);
+
+        err = serio_open(serio, drv);
+        if (err)
+                goto fail2;
+
+        err = input_register_device(pm->dev);
+        if (err)
+                goto fail3;
+
+        return 0;
+
+ fail3: serio_close(serio);
+ fail2: serio_set_drvdata(serio, NULL);
+ fail1: input_free_device(input_dev);
+        kfree(pm);
+        return err;
+}
+
+/*
+ * The serio driver structure.
+ */
+
+static struct serio_device_id pm_serio_ids[] = {
+        {
+                .type   = SERIO_RS232,
+                .proto  = SERIO_PENMOUNT,
+                .id     = SERIO_ANY,
+                .extra  = SERIO_ANY,
+        },
+        { 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, pm_serio_ids);
+
+static struct serio_driver pm_drv = {
+        .driver         = {
+                .name   = "penmountlpc",
+        },
+        .description    = DRIVER_DESC,
+        .id_table       = pm_serio_ids,
+        .interrupt      = pm_interrupt,
+        .connect        = pm_connect,
+        .disconnect     = pm_disconnect,
+};
+
+/*
+ * The functions for inserting/removing us as a module.
+ */
+
+static int __init pm_init(void)
+{
+        serio_register_driver(&pm_drv);
+        return 0;
+}
+
+static void __exit pm_exit(void)
+{
+        serio_unregister_driver(&pm_drv);
+}
+
+module_init(pm_init);
+module_exit(pm_exit);
diff --git a/drivers/input/touchscreen/touchright.c b/drivers/input/touchscreen/touchright.c
new file mode 100644
index 000000000000..1c89fa538651
--- /dev/null
+++ b/drivers/input/touchscreen/touchright.c
@@ -0,0 +1,196 @@
+/*
+ * Touchright serial touchscreen driver
+ *
+ * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
+ *
+ * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c)
+ * Copyright (c) 2004 Vojtech Pavlik
+ * and Dan Streetman <ddstreet@ieee.org>
+ */
+
+/*
+ * 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.
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/init.h>
+
+#define DRIVER_DESC     "Touchright serial touchscreen driver"
+
+MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * Definitions & global arrays.
+ */
+
+#define TR_FORMAT_TOUCH_BIT     0x01
+#define TR_FORMAT_STATUS_BYTE   0x40
+#define TR_FORMAT_STATUS_MASK   ~TR_FORMAT_TOUCH_BIT
+
+#define TR_LENGTH 5
+
+#define TR_MIN_XC 0
+#define TR_MAX_XC 0x1ff
+#define TR_MIN_YC 0
+#define TR_MAX_YC 0x1ff
+
+/*
+ * Per-touchscreen data.
+ */
+
+struct tr {
+        struct input_dev *dev;
+        struct serio *serio;
+        int idx;
+        unsigned char data[TR_LENGTH];
+        char phys[32];
+};
+
+static irqreturn_t tr_interrupt(struct serio *serio,
+                unsigned char data, unsigned int flags, struct pt_regs *regs)
+{
+        struct tr *tr = serio_get_drvdata(serio);
+        struct input_dev *dev = tr->dev;
+
+        tr->data[tr->idx] = data;
+
+        if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) {
+                if (++tr->idx == TR_LENGTH) {
+                        input_regs(dev, regs);
+                        input_report_abs(dev, ABS_X,
+                                (tr->data[1] << 5) | (tr->data[2] >> 1));
+                        input_report_abs(dev, ABS_Y,
+                                (tr->data[3] << 5) | (tr->data[4] >> 1));
+                        input_report_key(dev, BTN_TOUCH,
+                                tr->data[0] & TR_FORMAT_TOUCH_BIT);
+                        input_sync(dev);
+                        tr->idx = 0;
+                }
+        }
+
+        return IRQ_HANDLED;
+}
+
+/*
+ * tr_disconnect() is the opposite of tr_connect()
+ */
+
+static void tr_disconnect(struct serio *serio)
+{
+        struct tr *tr = serio_get_drvdata(serio);
+
+        input_get_device(tr->dev);
+        input_unregister_device(tr->dev);
+        serio_close(serio);
+        serio_set_drvdata(serio, NULL);
+        input_put_device(tr->dev);
+        kfree(tr);
+}
+
+/*
+ * tr_connect() is the routine that is called when someone adds a
+ * new serio device that supports the Touchright protocol and registers it as
+ * an input device.
+ */
+
+static int tr_connect(struct serio *serio, struct serio_driver *drv)
+{
+        struct tr *tr;
+        struct input_dev *input_dev;
+        int err;
+
+        tr = kzalloc(sizeof(struct tr), GFP_KERNEL);
+        input_dev = input_allocate_device();
+        if (!tr || !input_dev) {
+                err = -ENOMEM;
+                goto fail1;
+        }
+
+        tr->serio = serio;
+        tr->dev = input_dev;
+        snprintf(tr->phys, sizeof(tr->phys), "%s/input0", serio->phys);
+
+        input_dev->private = tr;
+        input_dev->name = "Touchright Serial TouchScreen";
+        input_dev->phys = tr->phys;
+        input_dev->id.bustype = BUS_RS232;
+        input_dev->id.vendor = SERIO_TOUCHRIGHT;
+        input_dev->id.product = 0;
+        input_dev->id.version = 0x0100;
+        input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
+        input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
+        input_set_abs_params(tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, 0, 0);
+        input_set_abs_params(tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, 0, 0);
+
+        serio_set_drvdata(serio, tr);
+
+        err = serio_open(serio, drv);
+        if (err)
+                goto fail2;
+
+        err = input_register_device(tr->dev);
+        if (err)
+                goto fail3;
+
+        return 0;
+
+ fail3: serio_close(serio);
+ fail2: serio_set_drvdata(serio, NULL);
+ fail1: input_free_device(input_dev);
+        kfree(tr);
+        return err;
+}
+
+/*
+ * The serio driver structure.
+ */
+
+static struct serio_device_id tr_serio_ids[] = {
+        {
+                .type   = SERIO_RS232,
+                .proto  = SERIO_TOUCHRIGHT,
+                .id     = SERIO_ANY,
+                .extra  = SERIO_ANY,
+        },
+        { 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, tr_serio_ids);
+
+static struct serio_driver tr_drv = {
+        .driver         = {
+                .name   = "touchright",
+        },
+        .description    = DRIVER_DESC,
+        .id_table       = tr_serio_ids,
+        .interrupt      = tr_interrupt,
+        .connect        = tr_connect,
+        .disconnect     = tr_disconnect,
+};
+
+/*
+ * The functions for inserting/removing us as a module.
+ */
+
+static int __init tr_init(void)
+{
+        serio_register_driver(&tr_drv);
+        return 0;
+}
+
+static void __exit tr_exit(void)
+{
+        serio_unregister_driver(&tr_drv);
+}
+
+module_init(tr_init);
+module_exit(tr_exit);
diff --git a/drivers/input/touchscreen/touchwin.c b/drivers/input/touchscreen/touchwin.c
new file mode 100644
index 000000000000..a7b4c755958e
--- /dev/null
+++ b/drivers/input/touchscreen/touchwin.c
@@ -0,0 +1,203 @@
+/*
+ * Touchwindow serial touchscreen driver
+ *
+ * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
+ *
+ * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c)
+ * Copyright (c) 2004 Vojtech Pavlik
+ * and Dan Streetman <ddstreet@ieee.org>
+ */
+
+/*
+ * 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.
+ */
+
+/*
+ * 2005/02/19 Rick Koch:
+ *   The Touchwindow I used is made by Edmark Corp. and
+ *   constantly outputs a stream of 0's unless it is touched.
+ *   It then outputs 3 bytes: X, Y, and a copy of Y.
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/serio.h>
+#include <linux/init.h>
+
+#define DRIVER_DESC     "Touchwindow serial touchscreen driver"
+
+MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * Definitions & global arrays.
+ */
+
+#define TW_LENGTH 3
+
+#define TW_MIN_XC 0
+#define TW_MAX_XC 0xff
+#define TW_MIN_YC 0
+#define TW_MAX_YC 0xff
+
+/*
+ * Per-touchscreen data.
+ */
+
+struct tw {
+        struct input_dev *dev;
+        struct serio *serio;
+        int idx;
+        int touched;
+        unsigned char data[TW_LENGTH];
+        char phys[32];
+};
+
+static irqreturn_t tw_interrupt(struct serio *serio,
+                unsigned char data, unsigned int flags, struct pt_regs *regs)
+{
+        struct tw *tw = serio_get_drvdata(serio);
+        struct input_dev *dev = tw->dev;
+
+        if (data) {             /* touch */
+                tw->touched = 1;
+                tw->data[tw->idx++] = data;
+                /* verify length and that the two Y's are the same */
+                if (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) {
+                        input_regs(dev, regs);
+                        input_report_abs(dev, ABS_X, tw->data[0]);
+                        input_report_abs(dev, ABS_Y, tw->data[1]);
+                        input_report_key(dev, BTN_TOUCH, 1);
+                        input_sync(dev);
+                        tw->idx = 0;
+                }
+        } else if (tw->touched) {       /* untouch */
+                input_report_key(dev, BTN_TOUCH, 0);
+                input_sync(dev);
+                tw->idx = 0;
+                tw->touched = 0;
+        }
+
+        return IRQ_HANDLED;
+}
+
+/*
+ * tw_disconnect() is the opposite of tw_connect()
+ */
+
+static void tw_disconnect(struct serio *serio)
+{
+        struct tw *tw = serio_get_drvdata(serio);
+
+        input_get_device(tw->dev);
+        input_unregister_device(tw->dev);
+        serio_close(serio);
+        serio_set_drvdata(serio, NULL);
+        input_put_device(tw->dev);
+        kfree(tw);
+}
+
+/*
+ * tw_connect() is the routine that is called when someone adds a
+ * new serio device that supports the Touchwin protocol and registers it as
+ * an input device.
+ */
+
+static int tw_connect(struct serio *serio, struct serio_driver *drv)
+{
+        struct tw *tw;
+        struct input_dev *input_dev;
+        int err;
+
+        tw = kzalloc(sizeof(struct tw), GFP_KERNEL);
+        input_dev = input_allocate_device();
+        if (!tw || !input_dev) {
+                err = -ENOMEM;
+                goto fail1;
+        }
+
+        tw->serio = serio;
+        tw->dev = input_dev;
+        snprintf(tw->phys, sizeof(tw->phys), "%s/input0", serio->phys);
+
+        input_dev->private = tw;
+        input_dev->name = "Touchwindow Serial TouchScreen";
+        input_dev->phys = tw->phys;
+        input_dev->id.bustype = BUS_RS232;
+        input_dev->id.vendor = SERIO_TOUCHWIN;
+        input_dev->id.product = 0;
+        input_dev->id.version = 0x0100;
+        input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
+        input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
+        input_set_abs_params(tw->dev, ABS_X, TW_MIN_XC, TW_MAX_XC, 0, 0);
+        input_set_abs_params(tw->dev, ABS_Y, TW_MIN_YC, TW_MAX_YC, 0, 0);
+
+        serio_set_drvdata(serio, tw);
+
+        err = serio_open(serio, drv);
+        if (err)
+                goto fail2;
+
+        err = input_register_device(tw->dev);
+        if (err)
+                goto fail3;
+
+        return 0;
+
+ fail3: serio_close(serio);
+ fail2: serio_set_drvdata(serio, NULL);
+ fail1: input_free_device(input_dev);
+        kfree(tw);
+        return err;
+}
+
+/*
+ * The serio driver structure.
+ */
+
+static struct serio_device_id tw_serio_ids[] = {
+        {
+                .type   = SERIO_RS232,
+                .proto  = SERIO_TOUCHWIN,
+                .id     = SERIO_ANY,
+                .extra  = SERIO_ANY,
+        },
+        { 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, tw_serio_ids);
+
+static struct serio_driver tw_drv = {
+        .driver         = {
+                .name   = "touchwin",
+        },
+        .description    = DRIVER_DESC,
+        .id_table       = tw_serio_ids,
+        .interrupt      = tw_interrupt,
+        .connect        = tw_connect,
+        .disconnect     = tw_disconnect,
+};
+
+/*
+ * The functions for inserting/removing us as a module.
+ */
+
+static int __init tw_init(void)
+{
+        serio_register_driver(&tw_drv);
+        return 0;
+}
+
+static void __exit tw_exit(void)
+{
+        serio_unregister_driver(&tw_drv);
+}
+
+module_init(tw_init);
+module_exit(tw_exit);