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1/*
2 * iNexio serial touchscreen driver
3 *
4 * Copyright (c) 2008 Richard Lemon
5 * Based on the mtouch driver (c) Vojtech Pavlik and Dan Streetman
6 *
7 */
8
9/*
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published by
12 * the Free Software Foundation.
13 */
14
15/*
16 * 2008/06/19 Richard Lemon <richard@codelemon.com>
17 * Copied mtouch.c and edited for iNexio protocol
18 */
19
20#include <linux/errno.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/slab.h>
24#include <linux/input.h>
25#include <linux/serio.h>
26#include <linux/init.h>
27
28#define DRIVER_DESC "iNexio serial touchscreen driver"
29
30MODULE_AUTHOR("Richard Lemon <richard@codelemon.com>");
31MODULE_DESCRIPTION(DRIVER_DESC);
32MODULE_LICENSE("GPL");
33
34/*
35 * Definitions & global arrays.
36 */
37
38#define INEXIO_FORMAT_TOUCH_BIT 0x01
39#define INEXIO_FORMAT_LENGTH 5
40#define INEXIO_RESPONSE_BEGIN_BYTE 0x80
41
42/* todo: check specs for max length of all responses */
43#define INEXIO_MAX_LENGTH 16
44
45#define INEXIO_MIN_XC 0
46#define INEXIO_MAX_XC 0x3fff
47#define INEXIO_MIN_YC 0
48#define INEXIO_MAX_YC 0x3fff
49
50#define INEXIO_GET_XC(data) (((data[1])<<7) | data[2])
51#define INEXIO_GET_YC(data) (((data[3])<<7) | data[4])
52#define INEXIO_GET_TOUCHED(data) (INEXIO_FORMAT_TOUCH_BIT & data[0])
53
54/*
55 * Per-touchscreen data.
56 */
57
58struct inexio {
59 struct input_dev *dev;
60 struct serio *serio;
61 int idx;
62 unsigned char data[INEXIO_MAX_LENGTH];
63 char phys[32];
64};
65
66static void inexio_process_data(struct inexio *pinexio)
67{
68 struct input_dev *dev = pinexio->dev;
69
70 if (INEXIO_FORMAT_LENGTH == ++pinexio->idx) {
71 input_report_abs(dev, ABS_X, INEXIO_GET_XC(pinexio->data));
72 input_report_abs(dev, ABS_Y, INEXIO_GET_YC(pinexio->data));
73 input_report_key(dev, BTN_TOUCH, INEXIO_GET_TOUCHED(pinexio->data));
74 input_sync(dev);
75
76 pinexio->idx = 0;
77 }
78}
79
80static irqreturn_t inexio_interrupt(struct serio *serio,
81 unsigned char data, unsigned int flags)
82{
83 struct inexio* pinexio = serio_get_drvdata(serio);
84
85 pinexio->data[pinexio->idx] = data;
86
87 if (INEXIO_RESPONSE_BEGIN_BYTE&pinexio->data[0])
88 inexio_process_data(pinexio);
89 else
90 printk(KERN_DEBUG "inexio.c: unknown/unsynchronized data from device, byte %x\n",pinexio->data[0]);
91
92 return IRQ_HANDLED;
93}
94
95/*
96 * inexio_disconnect() is the opposite of inexio_connect()
97 */
98
99static void inexio_disconnect(struct serio *serio)
100{
101 struct inexio* pinexio = serio_get_drvdata(serio);
102
103 input_get_device(pinexio->dev);
104 input_unregister_device(pinexio->dev);
105 serio_close(serio);
106 serio_set_drvdata(serio, NULL);
107 input_put_device(pinexio->dev);
108 kfree(pinexio);
109}
110
111/*
112 * inexio_connect() is the routine that is called when someone adds a
113 * new serio device that supports iNexio protocol and registers it as
114 * an input device. This is usually accomplished using inputattach.
115 */
116
117static int inexio_connect(struct serio *serio, struct serio_driver *drv)
118{
119 struct inexio *pinexio;
120 struct input_dev *input_dev;
121 int err;
122
123 pinexio = kzalloc(sizeof(struct inexio), GFP_KERNEL);
124 input_dev = input_allocate_device();
125 if (!pinexio || !input_dev) {
126 err = -ENOMEM;
127 goto fail1;
128 }
129
130 pinexio->serio = serio;
131 pinexio->dev = input_dev;
132 snprintf(pinexio->phys, sizeof(pinexio->phys), "%s/input0", serio->phys);
133
134 input_dev->name = "iNexio Serial TouchScreen";
135 input_dev->phys = pinexio->phys;
136 input_dev->id.bustype = BUS_RS232;
137 input_dev->id.vendor = SERIO_INEXIO;
138 input_dev->id.product = 0;
139 input_dev->id.version = 0x0001;
140 input_dev->dev.parent = &serio->dev;
141 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
142 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
143 input_set_abs_params(pinexio->dev, ABS_X, INEXIO_MIN_XC, INEXIO_MAX_XC, 0, 0);
144 input_set_abs_params(pinexio->dev, ABS_Y, INEXIO_MIN_YC, INEXIO_MAX_YC, 0, 0);
145
146 serio_set_drvdata(serio, pinexio);
147
148 err = serio_open(serio, drv);
149 if (err)
150 goto fail2;
151
152 err = input_register_device(pinexio->dev);
153 if (err)
154 goto fail3;
155
156 return 0;
157
158 fail3: serio_close(serio);
159 fail2: serio_set_drvdata(serio, NULL);
160 fail1: input_free_device(input_dev);
161 kfree(pinexio);
162 return err;
163}
164
165/*
166 * The serio driver structure.
167 */
168
169static struct serio_device_id inexio_serio_ids[] = {
170 {
171 .type = SERIO_RS232,
172 .proto = SERIO_INEXIO,
173 .id = SERIO_ANY,
174 .extra = SERIO_ANY,
175 },
176 { 0 }
177};
178
179MODULE_DEVICE_TABLE(serio, inexio_serio_ids);
180
181static struct serio_driver inexio_drv = {
182 .driver = {
183 .name = "inexio",
184 },
185 .description = DRIVER_DESC,
186 .id_table = inexio_serio_ids,
187 .interrupt = inexio_interrupt,
188 .connect = inexio_connect,
189 .disconnect = inexio_disconnect,
190};
191
192/*
193 * The functions for inserting/removing us as a module.
194 */
195
196static int __init inexio_init(void)
197{
198 return serio_register_driver(&inexio_drv);
199}
200
201static void __exit inexio_exit(void)
202{
203 serio_unregister_driver(&inexio_drv);
204}
205
206module_init(inexio_init);
207module_exit(inexio_exit);
1/*
2 * iNexio serial touchscreen driver
3 *
4 * Copyright (c) 2008 Richard Lemon
5 * Based on the mtouch driver (c) Vojtech Pavlik and Dan Streetman
6 *
7 */
8
9/*
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published by
12 * the Free Software Foundation.
13 */
14
15/*
16 * 2008/06/19 Richard Lemon <richard@codelemon.com>
17 * Copied mtouch.c and edited for iNexio protocol
18 */
19
20#include <linux/errno.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/slab.h>
24#include <linux/input.h>
25#include <linux/serio.h>
26
27#define DRIVER_DESC "iNexio serial touchscreen driver"
28
29MODULE_AUTHOR("Richard Lemon <richard@codelemon.com>");
30MODULE_DESCRIPTION(DRIVER_DESC);
31MODULE_LICENSE("GPL");
32
33/*
34 * Definitions & global arrays.
35 */
36
37#define INEXIO_FORMAT_TOUCH_BIT 0x01
38#define INEXIO_FORMAT_LENGTH 5
39#define INEXIO_RESPONSE_BEGIN_BYTE 0x80
40
41/* todo: check specs for max length of all responses */
42#define INEXIO_MAX_LENGTH 16
43
44#define INEXIO_MIN_XC 0
45#define INEXIO_MAX_XC 0x3fff
46#define INEXIO_MIN_YC 0
47#define INEXIO_MAX_YC 0x3fff
48
49#define INEXIO_GET_XC(data) (((data[1])<<7) | data[2])
50#define INEXIO_GET_YC(data) (((data[3])<<7) | data[4])
51#define INEXIO_GET_TOUCHED(data) (INEXIO_FORMAT_TOUCH_BIT & data[0])
52
53/*
54 * Per-touchscreen data.
55 */
56
57struct inexio {
58 struct input_dev *dev;
59 struct serio *serio;
60 int idx;
61 unsigned char data[INEXIO_MAX_LENGTH];
62 char phys[32];
63};
64
65static void inexio_process_data(struct inexio *pinexio)
66{
67 struct input_dev *dev = pinexio->dev;
68
69 if (INEXIO_FORMAT_LENGTH == ++pinexio->idx) {
70 input_report_abs(dev, ABS_X, INEXIO_GET_XC(pinexio->data));
71 input_report_abs(dev, ABS_Y, INEXIO_GET_YC(pinexio->data));
72 input_report_key(dev, BTN_TOUCH, INEXIO_GET_TOUCHED(pinexio->data));
73 input_sync(dev);
74
75 pinexio->idx = 0;
76 }
77}
78
79static irqreturn_t inexio_interrupt(struct serio *serio,
80 unsigned char data, unsigned int flags)
81{
82 struct inexio* pinexio = serio_get_drvdata(serio);
83
84 pinexio->data[pinexio->idx] = data;
85
86 if (INEXIO_RESPONSE_BEGIN_BYTE&pinexio->data[0])
87 inexio_process_data(pinexio);
88 else
89 printk(KERN_DEBUG "inexio.c: unknown/unsynchronized data from device, byte %x\n",pinexio->data[0]);
90
91 return IRQ_HANDLED;
92}
93
94/*
95 * inexio_disconnect() is the opposite of inexio_connect()
96 */
97
98static void inexio_disconnect(struct serio *serio)
99{
100 struct inexio* pinexio = serio_get_drvdata(serio);
101
102 input_get_device(pinexio->dev);
103 input_unregister_device(pinexio->dev);
104 serio_close(serio);
105 serio_set_drvdata(serio, NULL);
106 input_put_device(pinexio->dev);
107 kfree(pinexio);
108}
109
110/*
111 * inexio_connect() is the routine that is called when someone adds a
112 * new serio device that supports iNexio protocol and registers it as
113 * an input device. This is usually accomplished using inputattach.
114 */
115
116static int inexio_connect(struct serio *serio, struct serio_driver *drv)
117{
118 struct inexio *pinexio;
119 struct input_dev *input_dev;
120 int err;
121
122 pinexio = kzalloc(sizeof(struct inexio), GFP_KERNEL);
123 input_dev = input_allocate_device();
124 if (!pinexio || !input_dev) {
125 err = -ENOMEM;
126 goto fail1;
127 }
128
129 pinexio->serio = serio;
130 pinexio->dev = input_dev;
131 snprintf(pinexio->phys, sizeof(pinexio->phys), "%s/input0", serio->phys);
132
133 input_dev->name = "iNexio Serial TouchScreen";
134 input_dev->phys = pinexio->phys;
135 input_dev->id.bustype = BUS_RS232;
136 input_dev->id.vendor = SERIO_INEXIO;
137 input_dev->id.product = 0;
138 input_dev->id.version = 0x0001;
139 input_dev->dev.parent = &serio->dev;
140 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
141 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
142 input_set_abs_params(pinexio->dev, ABS_X, INEXIO_MIN_XC, INEXIO_MAX_XC, 0, 0);
143 input_set_abs_params(pinexio->dev, ABS_Y, INEXIO_MIN_YC, INEXIO_MAX_YC, 0, 0);
144
145 serio_set_drvdata(serio, pinexio);
146
147 err = serio_open(serio, drv);
148 if (err)
149 goto fail2;
150
151 err = input_register_device(pinexio->dev);
152 if (err)
153 goto fail3;
154
155 return 0;
156
157 fail3: serio_close(serio);
158 fail2: serio_set_drvdata(serio, NULL);
159 fail1: input_free_device(input_dev);
160 kfree(pinexio);
161 return err;
162}
163
164/*
165 * The serio driver structure.
166 */
167
168static struct serio_device_id inexio_serio_ids[] = {
169 {
170 .type = SERIO_RS232,
171 .proto = SERIO_INEXIO,
172 .id = SERIO_ANY,
173 .extra = SERIO_ANY,
174 },
175 { 0 }
176};
177
178MODULE_DEVICE_TABLE(serio, inexio_serio_ids);
179
180static struct serio_driver inexio_drv = {
181 .driver = {
182 .name = "inexio",
183 },
184 .description = DRIVER_DESC,
185 .id_table = inexio_serio_ids,
186 .interrupt = inexio_interrupt,
187 .connect = inexio_connect,
188 .disconnect = inexio_disconnect,
189};
190
191module_serio_driver(inexio_drv);