1 files changed, 219 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/mtouch.c b/drivers/input/touchscreen/mtouch.c
new file mode 100644
index 000000000000..aa8ee7842179
--- /dev/null
+++ b/drivers/input/touchscreen/mtouch.c
@@ -0,0 +1,219 @@
+/*
+ * MicroTouch (3M) serial touchscreen driver
+ *
+ * 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.
+ */
+
+/*
+ * 2005/02/19 Dan Streetman <ddstreet@ieee.org>
+ *   Copied elo.c and edited for MicroTouch protocol
+ */
+
+#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     "MicroTouch serial touchscreen driver"
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * Definitions & global arrays.
+ */
+
+#define MTOUCH_FORMAT_TABLET_STATUS_BIT 0x80
+#define MTOUCH_FORMAT_TABLET_TOUCH_BIT 0x40
+#define MTOUCH_FORMAT_TABLET_LENGTH 5
+#define MTOUCH_RESPONSE_BEGIN_BYTE 0x01
+#define MTOUCH_RESPONSE_END_BYTE 0x0d
+
+/* todo: check specs for max length of all responses */
+#define MTOUCH_MAX_LENGTH 16
+
+#define MTOUCH_MIN_XC 0
+#define MTOUCH_MAX_XC 0x3fff
+#define MTOUCH_MIN_YC 0
+#define MTOUCH_MAX_YC 0x3fff
+
+#define MTOUCH_GET_XC(data) (((data[2])<<7) | data[1])
+#define MTOUCH_GET_YC(data) (((data[4])<<7) | data[3])
+#define MTOUCH_GET_TOUCHED(data) (MTOUCH_FORMAT_TABLET_TOUCH_BIT & data[0])
+
+static char *mtouch_name = "MicroTouch Serial TouchScreen";
+
+/*
+ * Per-touchscreen data.
+ */
+
+struct mtouch {
+        struct input_dev dev;
+        struct serio *serio;
+        int idx;
+        unsigned char data[MTOUCH_MAX_LENGTH];
+        char phys[32];
+};
+
+static void mtouch_process_format_tablet(struct mtouch *mtouch, struct pt_regs *regs)
+{
+        struct input_dev *dev = &mtouch->dev;
+
+        if (MTOUCH_FORMAT_TABLET_LENGTH == ++mtouch->idx) {
+                input_regs(dev, regs);
+                input_report_abs(dev, ABS_X, MTOUCH_GET_XC(mtouch->data));
+                input_report_abs(dev, ABS_Y, MTOUCH_MAX_YC - MTOUCH_GET_YC(mtouch->data));
+                input_report_key(dev, BTN_TOUCH, MTOUCH_GET_TOUCHED(mtouch->data));
+                input_sync(dev);
+
+                mtouch->idx = 0;
+        }
+}
+
+static void mtouch_process_response(struct mtouch *mtouch, struct pt_regs *regs)
+{
+        if (MTOUCH_RESPONSE_END_BYTE == mtouch->data[mtouch->idx++]) {
+                /* FIXME - process response */
+                mtouch->idx = 0;
+        } else if (MTOUCH_MAX_LENGTH == mtouch->idx) {
+                printk(KERN_ERR "mtouch.c: too many response bytes\n");
+                mtouch->idx = 0;
+        }
+}
+
+static irqreturn_t mtouch_interrupt(struct serio *serio,
+                unsigned char data, unsigned int flags, struct pt_regs *regs)
+{
+        struct mtouch* mtouch = serio_get_drvdata(serio);
+
+        mtouch->data[mtouch->idx] = data;
+
+        if (MTOUCH_FORMAT_TABLET_STATUS_BIT & mtouch->data[0])
+                mtouch_process_format_tablet(mtouch, regs);
+        else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0])
+                mtouch_process_response(mtouch, regs);
+        else
+                printk(KERN_DEBUG "mtouch.c: unknown/unsynchronized data from device, byte %x\n",mtouch->data[0]);
+
+        return IRQ_HANDLED;
+}
+
+/*
+ * mtouch_disconnect() is the opposite of mtouch_connect()
+ */
+
+static void mtouch_disconnect(struct serio *serio)
+{
+        struct mtouch* mtouch = serio_get_drvdata(serio);
+
+        input_unregister_device(&mtouch->dev);
+        serio_close(serio);
+        serio_set_drvdata(serio, NULL);
+        kfree(mtouch);
+}
+
+/*
+ * mtouch_connect() is the routine that is called when someone adds a
+ * new serio device that supports MicroTouch (Format Tablet) protocol and registers it as
+ * an input device.
+ */
+
+static int mtouch_connect(struct serio *serio, struct serio_driver *drv)
+{
+        struct mtouch *mtouch;
+        int err;
+
+        if (!(mtouch = kmalloc(sizeof(*mtouch), GFP_KERNEL)))
+                return -ENOMEM;
+
+        memset(mtouch, 0, sizeof(*mtouch));
+
+        init_input_dev(&mtouch->dev);
+        mtouch->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
+        mtouch->dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
+
+        input_set_abs_params(&mtouch->dev, ABS_X, MTOUCH_MIN_XC, MTOUCH_MAX_XC, 0, 0);
+        input_set_abs_params(&mtouch->dev, ABS_Y, MTOUCH_MIN_YC, MTOUCH_MAX_YC, 0, 0);
+
+        mtouch->serio = serio;
+
+        sprintf(mtouch->phys, "%s/input0", serio->phys);
+
+        mtouch->dev.private = mtouch;
+        mtouch->dev.name = mtouch_name;
+        mtouch->dev.phys = mtouch->phys;
+        mtouch->dev.id.bustype = BUS_RS232;
+        mtouch->dev.id.vendor = SERIO_MICROTOUCH;
+        mtouch->dev.id.product = 0;
+        mtouch->dev.id.version = 0x0100;
+
+        serio_set_drvdata(serio, mtouch);
+
+        err = serio_open(serio, drv);
+        if (err) {
+                serio_set_drvdata(serio, NULL);
+                kfree(mtouch);
+                return err;
+        }
+
+        input_register_device(&mtouch->dev);
+
+        printk(KERN_INFO "input: %s on %s\n", mtouch->dev.name, serio->phys);
+
+        return 0;
+}
+
+/*
+ * The serio driver structure.
+ */
+
+static struct serio_device_id mtouch_serio_ids[] = {
+        {
+                .type   = SERIO_RS232,
+                .proto  = SERIO_MICROTOUCH,
+                .id     = SERIO_ANY,
+                .extra  = SERIO_ANY,
+        },
+        { 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, mtouch_serio_ids);
+
+static struct serio_driver mtouch_drv = {
+        .driver         = {
+                .name   = "mtouch",
+        },
+        .description    = DRIVER_DESC,
+        .id_table       = mtouch_serio_ids,
+        .interrupt      = mtouch_interrupt,
+        .connect        = mtouch_connect,
+        .disconnect     = mtouch_disconnect,
+};
+
+/*
+ * The functions for inserting/removing us as a module.
+ */
+
+static int __init mtouch_init(void)
+{
+        serio_register_driver(&mtouch_drv);
+        return 0;
+}
+
+static void __exit mtouch_exit(void)
+{
+        serio_unregister_driver(&mtouch_drv);
+}
+
+module_init(mtouch_init);
+module_exit(mtouch_exit);