Input: add driver for Touchwin serial touchscreens

Signed-off-by: Rick Koch <n1gp@hotmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 203 insertions, 0 deletions

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);