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Diffstat (limited to 'drivers/input/touchscreen/elo.c')
-rw-r--r--drivers/input/touchscreen/elo.c315
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 00000000000..546ce599334
--- /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);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-27 10:44:11 +0000