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+/*
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+ * Touchwindow serial touchscreen driver
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+ *
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+ * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
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+ *
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+ * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c)
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+ * Copyright (c) 2004 Vojtech Pavlik
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+ * and Dan Streetman <ddstreet@ieee.org>
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+ */
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+
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+/*
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License version 2 as published
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+ * by the Free Software Foundation.
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+ */
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+
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+/*
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+ * 2005/02/19 Rick Koch:
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+ * The Touchwindow I used is made by Edmark Corp. and
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+ * constantly outputs a stream of 0's unless it is touched.
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+ * It then outputs 3 bytes: X, Y, and a copy of Y.
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+ */
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+
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+#include <linux/errno.h>
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/slab.h>
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+#include <linux/input.h>
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+#include <linux/serio.h>
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+#include <linux/init.h>
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+
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+#define DRIVER_DESC "Touchwindow serial touchscreen driver"
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+
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+MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
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+MODULE_DESCRIPTION(DRIVER_DESC);
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+MODULE_LICENSE("GPL");
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+
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+/*
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+ * Definitions & global arrays.
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+ */
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+
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+#define TW_LENGTH 3
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+
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+#define TW_MIN_XC 0
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+#define TW_MAX_XC 0xff
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+#define TW_MIN_YC 0
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+#define TW_MAX_YC 0xff
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+
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+/*
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+ * Per-touchscreen data.
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+ */
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+
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+struct tw {
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+ struct input_dev *dev;
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+ struct serio *serio;
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+ int idx;
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+ int touched;
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+ unsigned char data[TW_LENGTH];
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+ char phys[32];
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+};
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+
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+static irqreturn_t tw_interrupt(struct serio *serio,
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+ unsigned char data, unsigned int flags, struct pt_regs *regs)
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+{
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+ struct tw *tw = serio_get_drvdata(serio);
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+ struct input_dev *dev = tw->dev;
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+
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+ if (data) { /* touch */
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+ tw->touched = 1;
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+ tw->data[tw->idx++] = data;
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+ /* verify length and that the two Y's are the same */
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+ if (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) {
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+ input_regs(dev, regs);
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+ input_report_abs(dev, ABS_X, tw->data[0]);
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+ input_report_abs(dev, ABS_Y, tw->data[1]);
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+ input_report_key(dev, BTN_TOUCH, 1);
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+ input_sync(dev);
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+ tw->idx = 0;
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+ }
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+ } else if (tw->touched) { /* untouch */
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+ input_report_key(dev, BTN_TOUCH, 0);
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+ input_sync(dev);
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+ tw->idx = 0;
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+ tw->touched = 0;
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+ }
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+
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+ return IRQ_HANDLED;
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+}
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+
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+/*
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+ * tw_disconnect() is the opposite of tw_connect()
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+ */
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+
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+static void tw_disconnect(struct serio *serio)
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+{
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+ struct tw *tw = serio_get_drvdata(serio);
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+
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+ input_get_device(tw->dev);
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+ input_unregister_device(tw->dev);
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+ serio_close(serio);
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+ serio_set_drvdata(serio, NULL);
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+ input_put_device(tw->dev);
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+ kfree(tw);
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+}
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+
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+/*
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+ * tw_connect() is the routine that is called when someone adds a
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+ * new serio device that supports the Touchwin protocol and registers it as
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+ * an input device.
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+ */
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+
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+static int tw_connect(struct serio *serio, struct serio_driver *drv)
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+{
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+ struct tw *tw;
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+ struct input_dev *input_dev;
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+ int err;
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+
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+ tw = kzalloc(sizeof(struct tw), GFP_KERNEL);
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+ input_dev = input_allocate_device();
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+ if (!tw || !input_dev) {
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+ err = -ENOMEM;
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+ goto fail1;
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+ }
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+
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+ tw->serio = serio;
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+ tw->dev = input_dev;
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+ snprintf(tw->phys, sizeof(tw->phys), "%s/input0", serio->phys);
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+
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+ input_dev->private = tw;
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+ input_dev->name = "Touchwindow Serial TouchScreen";
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+ input_dev->phys = tw->phys;
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+ input_dev->id.bustype = BUS_RS232;
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+ input_dev->id.vendor = SERIO_TOUCHWIN;
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+ input_dev->id.product = 0;
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+ input_dev->id.version = 0x0100;
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+ input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
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+ input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
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+ input_set_abs_params(tw->dev, ABS_X, TW_MIN_XC, TW_MAX_XC, 0, 0);
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+ input_set_abs_params(tw->dev, ABS_Y, TW_MIN_YC, TW_MAX_YC, 0, 0);
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+
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+ serio_set_drvdata(serio, tw);
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+
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+ err = serio_open(serio, drv);
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+ if (err)
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+ goto fail2;
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+
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+ err = input_register_device(tw->dev);
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+ if (err)
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+ goto fail3;
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+
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+ return 0;
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+
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+ fail3: serio_close(serio);
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+ fail2: serio_set_drvdata(serio, NULL);
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+ fail1: input_free_device(input_dev);
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+ kfree(tw);
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+ return err;
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+}
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+
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+/*
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+ * The serio driver structure.
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+ */
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+
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+static struct serio_device_id tw_serio_ids[] = {
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+ {
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+ .type = SERIO_RS232,
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+ .proto = SERIO_TOUCHWIN,
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+ .id = SERIO_ANY,
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+ .extra = SERIO_ANY,
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+ },
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+ { 0 }
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+};
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+
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+MODULE_DEVICE_TABLE(serio, tw_serio_ids);
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+
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+static struct serio_driver tw_drv = {
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+ .driver = {
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+ .name = "touchwin",
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+ },
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+ .description = DRIVER_DESC,
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+ .id_table = tw_serio_ids,
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+ .interrupt = tw_interrupt,
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+ .connect = tw_connect,
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+ .disconnect = tw_disconnect,
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+};
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+
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+/*
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+ * The functions for inserting/removing us as a module.
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+ */
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+
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+static int __init tw_init(void)
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+{
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+ serio_register_driver(&tw_drv);
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+ return 0;
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+}
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+
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+static void __exit tw_exit(void)
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+{
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+ serio_unregister_driver(&tw_drv);
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+}
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+
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+module_init(tw_init);
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+module_exit(tw_exit);
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Rick Koch