2 * Elo serial touchscreen driver
4 * Copyright (c) 2004 Vojtech Pavlik
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published by
10 * the Free Software Foundation.
14 * This driver can handle serial Elo touchscreens using either the Elo standard
15 * 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo
16 * legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-byte protocol.
19 #include <linux/errno.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/input.h>
24 #include <linux/serio.h>
25 #include <linux/init.h>
27 #define DRIVER_DESC "Elo serial touchscreen driver"
29 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
30 MODULE_DESCRIPTION(DRIVER_DESC);
31 MODULE_LICENSE("GPL");
34 * Definitions & global arrays.
37 #define ELO_MAX_LENGTH 10
39 static char *elo_name = "Elo Serial TouchScreen";
42 * Per-touchscreen data.
51 unsigned char data[ELO_MAX_LENGTH];
55 static void elo_process_data_10(struct elo* elo, unsigned char data, struct pt_regs *regs)
57 struct input_dev *dev = &elo->dev;
59 elo->csum += elo->data[elo->idx] = data;
79 input_regs(dev, regs);
80 input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]);
81 input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]);
82 input_report_abs(dev, ABS_PRESSURE, (elo->data[8] << 8) | elo->data[7]);
83 input_report_key(dev, BTN_TOUCH, elo->data[2] & 3);
92 static void elo_process_data_6(struct elo* elo, unsigned char data, struct pt_regs *regs)
94 struct input_dev *dev = &elo->dev;
96 elo->data[elo->idx] = data;
100 case 0: if ((data & 0xc0) != 0xc0) elo->idx = 0; break;
101 case 1: if ((data & 0xc0) != 0x80) elo->idx = 0; break;
102 case 2: if ((data & 0xc0) != 0x40) elo->idx = 0; break;
110 input_regs(dev, regs);
111 input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f));
112 input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f));
115 input_report_key(dev, BTN_TOUCH, 1);
130 if ((data & 0xf0) == 0) {
131 input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
132 input_report_key(dev, BTN_TOUCH, elo->data[5]);
140 static void elo_process_data_3(struct elo* elo, unsigned char data, struct pt_regs *regs)
142 struct input_dev *dev = &elo->dev;
144 elo->data[elo->idx] = data;
146 switch (elo->idx++) {
149 if ((data & 0x7f) != 0x01)
153 input_regs(dev, regs);
154 input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
155 input_report_abs(dev, ABS_X, elo->data[1]);
156 input_report_abs(dev, ABS_Y, elo->data[2]);
163 static irqreturn_t elo_interrupt(struct serio *serio,
164 unsigned char data, unsigned int flags, struct pt_regs *regs)
166 struct elo* elo = serio_get_drvdata(serio);
170 elo_process_data_10(elo, data, regs);
175 elo_process_data_6(elo, data, regs);
179 elo_process_data_3(elo, data, regs);
187 * elo_disconnect() is the opposite of elo_connect()
190 static void elo_disconnect(struct serio *serio)
192 struct elo* elo = serio_get_drvdata(serio);
194 input_unregister_device(&elo->dev);
196 serio_set_drvdata(serio, NULL);
201 * elo_connect() is the routine that is called when someone adds a
202 * new serio device that supports Gunze protocol and registers it as
206 static int elo_connect(struct serio *serio, struct serio_driver *drv)
211 if (!(elo = kmalloc(sizeof(struct elo), GFP_KERNEL)))
214 memset(elo, 0, sizeof(struct elo));
216 init_input_dev(&elo->dev);
217 elo->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
218 elo->dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
220 elo->id = serio->id.id;
224 case 0: /* 10-byte protocol */
225 input_set_abs_params(&elo->dev, ABS_X, 96, 4000, 0, 0);
226 input_set_abs_params(&elo->dev, ABS_Y, 96, 4000, 0, 0);
227 input_set_abs_params(&elo->dev, ABS_PRESSURE, 0, 255, 0, 0);
230 case 1: /* 6-byte protocol */
231 input_set_abs_params(&elo->dev, ABS_PRESSURE, 0, 15, 0, 0);
233 case 2: /* 4-byte protocol */
234 input_set_abs_params(&elo->dev, ABS_X, 96, 4000, 0, 0);
235 input_set_abs_params(&elo->dev, ABS_Y, 96, 4000, 0, 0);
238 case 3: /* 3-byte protocol */
239 input_set_abs_params(&elo->dev, ABS_X, 0, 255, 0, 0);
240 input_set_abs_params(&elo->dev, ABS_Y, 0, 255, 0, 0);
246 sprintf(elo->phys, "%s/input0", serio->phys);
248 elo->dev.private = elo;
249 elo->dev.name = elo_name;
250 elo->dev.phys = elo->phys;
251 elo->dev.id.bustype = BUS_RS232;
252 elo->dev.id.vendor = SERIO_ELO;
253 elo->dev.id.product = elo->id;
254 elo->dev.id.version = 0x0100;
256 serio_set_drvdata(serio, elo);
258 err = serio_open(serio, drv);
260 serio_set_drvdata(serio, NULL);
265 input_register_device(&elo->dev);
267 printk(KERN_INFO "input: %s on %s\n", elo_name, serio->phys);
273 * The serio driver structure.
276 static struct serio_device_id elo_serio_ids[] = {
286 MODULE_DEVICE_TABLE(serio, elo_serio_ids);
288 static struct serio_driver elo_drv = {
292 .description = DRIVER_DESC,
293 .id_table = elo_serio_ids,
294 .interrupt = elo_interrupt,
295 .connect = elo_connect,
296 .disconnect = elo_disconnect,
300 * The functions for inserting/removing us as a module.
303 static int __init elo_init(void)
305 serio_register_driver(&elo_drv);
309 static void __exit elo_exit(void)
311 serio_unregister_driver(&elo_drv);
314 module_init(elo_init);
315 module_exit(elo_exit);