Input: add driver for Touchwin serial touchscreens

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

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 216db12..9418bbe 100644 (file)
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -132,4 +132,16 @@ config TOUCHSCREEN_TOUCHRIGHT
          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 deda25e..1abb8f1 100644 (file)
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -14,3 +14,4 @@ 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/touchwin.c b/drivers/input/touchscreen/touchwin.c
new file mode 100644 (file)
index 0000000..a7b4c75
--- /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);

diff --git a/include/linux/serio.h b/include/linux/serio.h
index 1526064..c906931 100644 (file)
--- a/include/linux/serio.h
+++ b/include/linux/serio.h
@@ -219,5 +219,6 @@ static inline void serio_unpin_driver(struct serio *serio)
 #define SERIO_MICROTOUCH       0x30
 #define SERIO_PENMOUNT 0x31
 #define SERIO_TOUCHRIGHT       0x32
+#define SERIO_TOUCHWIN 0x33
 
 #endif