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Diffstat (limited to 'drivers/input/touchscreen/touchwin.c')
-rw-r--r--drivers/input/touchscreen/touchwin.c181
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/touchwin.c b/drivers/input/touchscreen/touchwin.c
new file mode 100644
index 000000000..bde3c6ee3
--- /dev/null
+++ b/drivers/input/touchscreen/touchwin.c
@@ -0,0 +1,181 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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>
+ */
+
+
+/*
+ * 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>
+
+#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 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_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->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->dev.parent = &serio->dev;
+ input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+ input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(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 const 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,
+};
+
+module_serio_driver(tw_drv);