1 files changed, 315 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/elo.c b/drivers/input/touchscreen/elo.c
new file mode 100644
index 0000000..546ce59
--- /dev/null
+++ b/drivers/input/touchscreen/elo.c
@@ -0,0 +1,315 @@
+/*
+ * Elo 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.
+ */
+
+/*
+ * This driver can handle serial Elo touchscreens using either the Elo standard
+ * 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo
+ * legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-byte 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	"Elo serial touchscreen driver"
+
+MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/*
+ * Definitions & global arrays.
+ */
+
+#define	ELO_MAX_LENGTH	10
+
+static char *elo_name = "Elo Serial TouchScreen";
+
+/*
+ * Per-touchscreen data.
+ */
+
+struct elo {
+	struct input_dev dev;
+	struct serio *serio;
+	int id;
+	int idx;
+	unsigned char csum;
+	unsigned char data[ELO_MAX_LENGTH];
+	char phys[32];
+};
+
+static void elo_process_data_10(struct elo* elo, unsigned char data, struct pt_regs *regs)
+{
+	struct input_dev *dev = &elo->dev;
+
+	elo->csum += elo->data[elo->idx] = data;
+
+	switch (elo->idx++) {
+
+		case 0:
+			if (data != 'U') {
+				elo->idx = 0;
+				elo->csum = 0;
+			}
+			break;
+
+		case 1:
+			if (data != 'T') {
+				elo->idx = 0;
+				elo->csum = 0;
+			}
+			break;
+
+		case 9:
+			if (elo->csum) {
+				input_regs(dev, regs);
+				input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]);
+				input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]);
+				input_report_abs(dev, ABS_PRESSURE, (elo->data[8] << 8) | elo->data[7]);
+				input_report_key(dev, BTN_TOUCH, elo->data[2] & 3);
+				input_sync(dev);
+			}
+			elo->idx = 0;
+			elo->csum = 0;
+			break;
+	}
+}
+
+static void elo_process_data_6(struct elo* elo, unsigned char data, struct pt_regs *regs)
+{
+	struct input_dev *dev = &elo->dev;
+
+	elo->data[elo->idx] = data;
+
+	switch (elo->idx++) {
+
+		case 0: if ((data & 0xc0) != 0xc0) elo->idx = 0; break;
+		case 1: if ((data & 0xc0) != 0x80) elo->idx = 0; break;
+		case 2: if ((data & 0xc0) != 0x40) elo->idx = 0; break;
+
+		case 3:
+			if (data & 0xc0) {
+				elo->idx = 0;
+				break;
+			}
+
+			input_regs(dev, regs);
+			input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f));
+			input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f));
+
+			if (elo->id == 2) {
+				input_report_key(dev, BTN_TOUCH, 1);
+				input_sync(dev);
+				elo->idx = 0;
+			}
+
+			break;
+
+		case 4:
+			if (data) {
+				input_sync(dev);
+				elo->idx = 0;
+			}
+			break;
+
+		case 5:
+			if ((data & 0xf0) == 0) {
+				input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
+				input_report_key(dev, BTN_TOUCH, elo->data[5]);
+			}
+			input_sync(dev);
+			elo->idx = 0;
+			break;
+	}
+}
+
+static void elo_process_data_3(struct elo* elo, unsigned char data, struct pt_regs *regs)
+{
+	struct input_dev *dev = &elo->dev;
+
+	elo->data[elo->idx] = data;
+
+	switch (elo->idx++) {
+
+		case 0:
+			if ((data & 0x7f) != 0x01)
+				elo->idx = 0;
+			break;
+		case 2:
+			input_regs(dev, regs);
+			input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
+			input_report_abs(dev, ABS_X, elo->data[1]);
+			input_report_abs(dev, ABS_Y, elo->data[2]);
+			input_sync(dev);
+			elo->idx = 0;
+			break;
+	}
+}
+
+static irqreturn_t elo_interrupt(struct serio *serio,
+		unsigned char data, unsigned int flags, struct pt_regs *regs)
+{
+	struct elo* elo = serio_get_drvdata(serio);
+
+	switch(elo->id) {
+		case 0:
+			elo_process_data_10(elo, data, regs);
+			break;
+
+		case 1:
+		case 2:
+			elo_process_data_6(elo, data, regs);
+			break;
+
+		case 3:
+			elo_process_data_3(elo, data, regs);
+			break;
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * elo_disconnect() is the opposite of elo_connect()
+ */
+
+static void elo_disconnect(struct serio *serio)
+{
+	struct elo* elo = serio_get_drvdata(serio);
+
+	input_unregister_device(&elo->dev);
+	serio_close(serio);
+	serio_set_drvdata(serio, NULL);
+	kfree(elo);
+}
+
+/*
+ * elo_connect() is the routine that is called when someone adds a
+ * new serio device that supports Gunze protocol and registers it as
+ * an input device.
+ */
+
+static int elo_connect(struct serio *serio, struct serio_driver *drv)
+{
+	struct elo *elo;
+	int err;
+
+	if (!(elo = kmalloc(sizeof(struct elo), GFP_KERNEL)))
+		return -ENOMEM;
+
+	memset(elo, 0, sizeof(struct elo));
+
+	init_input_dev(&elo->dev);
+	elo->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
+	elo->dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
+
+	elo->id = serio->id.id;
+
+	switch (elo->id) {
+
+		case 0: /* 10-byte protocol */
+			input_set_abs_params(&elo->dev, ABS_X, 96, 4000, 0, 0);
+			input_set_abs_params(&elo->dev, ABS_Y, 96, 4000, 0, 0);
+			input_set_abs_params(&elo->dev, ABS_PRESSURE, 0, 255, 0, 0);
+			break;
+		
+		case 1: /* 6-byte protocol */
+			input_set_abs_params(&elo->dev, ABS_PRESSURE, 0, 15, 0, 0);
+
+		case 2: /* 4-byte protocol */
+			input_set_abs_params(&elo->dev, ABS_X, 96, 4000, 0, 0);
+			input_set_abs_params(&elo->dev, ABS_Y, 96, 4000, 0, 0);
+			break;
+
+		case 3: /* 3-byte protocol */
+			input_set_abs_params(&elo->dev, ABS_X, 0, 255, 0, 0);
+			input_set_abs_params(&elo->dev, ABS_Y, 0, 255, 0, 0);
+			break;
+	}
+
+	elo->serio = serio;
+
+	sprintf(elo->phys, "%s/input0", serio->phys);
+
+	elo->dev.private = elo;
+	elo->dev.name = elo_name;
+	elo->dev.phys = elo->phys;
+	elo->dev.id.bustype = BUS_RS232;
+	elo->dev.id.vendor = SERIO_ELO;
+	elo->dev.id.product = elo->id;
+	elo->dev.id.version = 0x0100;
+
+	serio_set_drvdata(serio, elo);
+
+	err = serio_open(serio, drv);
+	if (err) {
+		serio_set_drvdata(serio, NULL);
+		kfree(elo);
+		return err;
+	}
+
+	input_register_device(&elo->dev);
+
+	printk(KERN_INFO "input: %s on %s\n", elo_name, serio->phys);
+
+	return 0;
+}
+
+/*
+ * The serio driver structure.
+ */
+
+static struct serio_device_id elo_serio_ids[] = {
+	{
+		.type	= SERIO_RS232,
+		.proto	= SERIO_ELO,
+		.id	= SERIO_ANY,
+		.extra	= SERIO_ANY,
+	},
+	{ 0 }
+};
+
+MODULE_DEVICE_TABLE(serio, elo_serio_ids);
+
+static struct serio_driver elo_drv = {
+	.driver		= {
+		.name	= "elo",
+	},
+	.description	= DRIVER_DESC,
+	.id_table	= elo_serio_ids,
+	.interrupt	= elo_interrupt,
+	.connect	= elo_connect,
+	.disconnect	= elo_disconnect,
+};
+
+/*
+ * The functions for inserting/removing us as a module.
+ */
+
+static int __init elo_init(void)
+{
+	serio_register_driver(&elo_drv);
+	return 0;
+}
+
+static void __exit elo_exit(void)
+{
+	serio_unregister_driver(&elo_drv);
+}
+
+module_init(elo_init);
+module_exit(elo_exit);