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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * MicroTouch (3M) serial touchscreen driver
3 *
4 * Copyright (c) 2004 Vojtech Pavlik
5 */
6
7/*
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.
11 */
12
13/*
14 * 2005/02/19 Dan Streetman <ddstreet@ieee.org>
15 * Copied elo.c and edited for MicroTouch protocol
16 */
17
18#include <linux/errno.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/slab.h>
22#include <linux/input.h>
23#include <linux/serio.h>
24#include <linux/init.h>
25
26#define DRIVER_DESC "MicroTouch serial touchscreen driver"
27
28MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
29MODULE_DESCRIPTION(DRIVER_DESC);
30MODULE_LICENSE("GPL");
31
32/*
33 * Definitions & global arrays.
34 */
35
36#define MTOUCH_FORMAT_TABLET_STATUS_BIT 0x80
37#define MTOUCH_FORMAT_TABLET_TOUCH_BIT 0x40
38#define MTOUCH_FORMAT_TABLET_LENGTH 5
39#define MTOUCH_RESPONSE_BEGIN_BYTE 0x01
40#define MTOUCH_RESPONSE_END_BYTE 0x0d
41
42/* todo: check specs for max length of all responses */
43#define MTOUCH_MAX_LENGTH 16
44
45#define MTOUCH_MIN_XC 0
46#define MTOUCH_MAX_XC 0x3fff
47#define MTOUCH_MIN_YC 0
48#define MTOUCH_MAX_YC 0x3fff
49
50#define MTOUCH_GET_XC(data) (((data[2])<<7) | data[1])
51#define MTOUCH_GET_YC(data) (((data[4])<<7) | data[3])
52#define MTOUCH_GET_TOUCHED(data) (MTOUCH_FORMAT_TABLET_TOUCH_BIT & data[0])
53
Linus Torvalds1da177e2005-04-16 15:20:36 -070054/*
55 * Per-touchscreen data.
56 */
57
58struct mtouch {
Dmitry Torokhoveca1ed12005-09-15 02:01:46 -050059 struct input_dev *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 struct serio *serio;
61 int idx;
62 unsigned char data[MTOUCH_MAX_LENGTH];
63 char phys[32];
64};
65
66static void mtouch_process_format_tablet(struct mtouch *mtouch, struct pt_regs *regs)
67{
Dmitry Torokhoveca1ed12005-09-15 02:01:46 -050068 struct input_dev *dev = mtouch->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
70 if (MTOUCH_FORMAT_TABLET_LENGTH == ++mtouch->idx) {
71 input_regs(dev, regs);
72 input_report_abs(dev, ABS_X, MTOUCH_GET_XC(mtouch->data));
73 input_report_abs(dev, ABS_Y, MTOUCH_MAX_YC - MTOUCH_GET_YC(mtouch->data));
74 input_report_key(dev, BTN_TOUCH, MTOUCH_GET_TOUCHED(mtouch->data));
75 input_sync(dev);
76
77 mtouch->idx = 0;
78 }
79}
80
81static void mtouch_process_response(struct mtouch *mtouch, struct pt_regs *regs)
82{
83 if (MTOUCH_RESPONSE_END_BYTE == mtouch->data[mtouch->idx++]) {
84 /* FIXME - process response */
85 mtouch->idx = 0;
86 } else if (MTOUCH_MAX_LENGTH == mtouch->idx) {
87 printk(KERN_ERR "mtouch.c: too many response bytes\n");
88 mtouch->idx = 0;
89 }
90}
91
92static irqreturn_t mtouch_interrupt(struct serio *serio,
93 unsigned char data, unsigned int flags, struct pt_regs *regs)
94{
95 struct mtouch* mtouch = serio_get_drvdata(serio);
96
97 mtouch->data[mtouch->idx] = data;
98
99 if (MTOUCH_FORMAT_TABLET_STATUS_BIT & mtouch->data[0])
100 mtouch_process_format_tablet(mtouch, regs);
101 else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0])
102 mtouch_process_response(mtouch, regs);
103 else
104 printk(KERN_DEBUG "mtouch.c: unknown/unsynchronized data from device, byte %x\n",mtouch->data[0]);
105
106 return IRQ_HANDLED;
107}
108
109/*
110 * mtouch_disconnect() is the opposite of mtouch_connect()
111 */
112
113static void mtouch_disconnect(struct serio *serio)
114{
115 struct mtouch* mtouch = serio_get_drvdata(serio);
116
Dmitry Torokhoveca1ed12005-09-15 02:01:46 -0500117 input_get_device(mtouch->dev);
118 input_unregister_device(mtouch->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 serio_close(serio);
120 serio_set_drvdata(serio, NULL);
Dmitry Torokhoveca1ed12005-09-15 02:01:46 -0500121 input_put_device(mtouch->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 kfree(mtouch);
123}
124
125/*
126 * mtouch_connect() is the routine that is called when someone adds a
127 * new serio device that supports MicroTouch (Format Tablet) protocol and registers it as
128 * an input device.
129 */
130
131static int mtouch_connect(struct serio *serio, struct serio_driver *drv)
132{
133 struct mtouch *mtouch;
Dmitry Torokhoveca1ed12005-09-15 02:01:46 -0500134 struct input_dev *input_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 int err;
136
Dmitry Torokhoveca1ed12005-09-15 02:01:46 -0500137 mtouch = kzalloc(sizeof(struct mtouch), GFP_KERNEL);
138 input_dev = input_allocate_device();
139 if (!mtouch || !input_dev) {
140 err = -ENOMEM;
141 goto fail;
142 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
144 mtouch->serio = serio;
Dmitry Torokhoveca1ed12005-09-15 02:01:46 -0500145 mtouch->dev = input_dev;
Dmitry Torokhova21466c2006-06-26 01:46:04 -0400146 snprintf(mtouch->phys, sizeof(mtouch->phys), "%s/input0", serio->phys);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Dmitry Torokhoveca1ed12005-09-15 02:01:46 -0500148 input_dev->private = mtouch;
149 input_dev->name = "MicroTouch Serial TouchScreen";
150 input_dev->phys = mtouch->phys;
151 input_dev->id.bustype = BUS_RS232;
152 input_dev->id.vendor = SERIO_MICROTOUCH;
153 input_dev->id.product = 0;
154 input_dev->id.version = 0x0100;
155 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
156 input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
157 input_set_abs_params(mtouch->dev, ABS_X, MTOUCH_MIN_XC, MTOUCH_MAX_XC, 0, 0);
158 input_set_abs_params(mtouch->dev, ABS_Y, MTOUCH_MIN_YC, MTOUCH_MAX_YC, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160 serio_set_drvdata(serio, mtouch);
161
162 err = serio_open(serio, drv);
Dmitry Torokhoveca1ed12005-09-15 02:01:46 -0500163 if (err)
164 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
Dmitry Torokhoveca1ed12005-09-15 02:01:46 -0500166 input_register_device(mtouch->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
168 return 0;
Dmitry Torokhoveca1ed12005-09-15 02:01:46 -0500169
170 fail: serio_set_drvdata(serio, NULL);
171 input_free_device(input_dev);
172 kfree(mtouch);
173 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174}
175
176/*
177 * The serio driver structure.
178 */
179
180static struct serio_device_id mtouch_serio_ids[] = {
181 {
182 .type = SERIO_RS232,
183 .proto = SERIO_MICROTOUCH,
184 .id = SERIO_ANY,
185 .extra = SERIO_ANY,
186 },
187 { 0 }
188};
189
190MODULE_DEVICE_TABLE(serio, mtouch_serio_ids);
191
192static struct serio_driver mtouch_drv = {
193 .driver = {
194 .name = "mtouch",
195 },
196 .description = DRIVER_DESC,
197 .id_table = mtouch_serio_ids,
198 .interrupt = mtouch_interrupt,
199 .connect = mtouch_connect,
200 .disconnect = mtouch_disconnect,
201};
202
203/*
204 * The functions for inserting/removing us as a module.
205 */
206
207static int __init mtouch_init(void)
208{
209 serio_register_driver(&mtouch_drv);
210 return 0;
211}
212
213static void __exit mtouch_exit(void)
214{
215 serio_unregister_driver(&mtouch_drv);
216}
217
218module_init(mtouch_init);
219module_exit(mtouch_exit);