tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Penmount serial touchscreen driver
3 *
4 * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
5 *
6 * Based on ELO driver (drivers/input/touchscreen/elo.c)
7 * Copyright (c) 2004 Vojtech Pavlik
8 */
9
10/*
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License version 2 as published
13 * by the Free Software Foundation.
14 */
15
16#include <linux/errno.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/slab.h>
20#include <linux/input.h>
21#include <linux/serio.h>
22#include <linux/init.h>
23
24#define DRIVER_DESC "Penmount serial touchscreen driver"
25
26MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
27MODULE_DESCRIPTION(DRIVER_DESC);
28MODULE_LICENSE("GPL");
29
30/*
31 * Definitions & global arrays.
32 */
33
34#define PM_MAX_LENGTH 5
35
36/*
37 * Per-touchscreen data.
38 */
39
40struct pm {
41 struct input_dev *dev;
42 struct serio *serio;
43 int idx;
44 unsigned char data[PM_MAX_LENGTH];
45 char phys[32];
46};
47
48static irqreturn_t pm_interrupt(struct serio *serio,
49 unsigned char data, unsigned int flags, struct pt_regs *regs)
50{
51 struct pm *pm = serio_get_drvdata(serio);
52 struct input_dev *dev = pm->dev;
53
54 pm->data[pm->idx] = data;
55
56 if (pm->data[0] & 0x80) {
57 if (PM_MAX_LENGTH == ++pm->idx) {
58 input_regs(dev, regs);
59 input_report_abs(dev, ABS_X, pm->data[2] * 128 + pm->data[1]);
60 input_report_abs(dev, ABS_Y, pm->data[4] * 128 + pm->data[3]);
61 input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40));
62 input_sync(dev);
63 pm->idx = 0;
64 }
65 }
66
67 return IRQ_HANDLED;
68}
69
70/*
71 * pm_disconnect() is the opposite of pm_connect()
72 */
73
74static void pm_disconnect(struct serio *serio)
75{
76 struct pm *pm = serio_get_drvdata(serio);
77
78 input_get_device(pm->dev);
79 input_unregister_device(pm->dev);
80 serio_close(serio);
81 serio_set_drvdata(serio, NULL);
82 input_put_device(pm->dev);
83 kfree(pm);
84}
85
86/*
87 * pm_connect() is the routine that is called when someone adds a
88 * new serio device that supports Gunze protocol and registers it as
89 * an input device.
90 */
91
92static int pm_connect(struct serio *serio, struct serio_driver *drv)
93{
94 struct pm *pm;
95 struct input_dev *input_dev;
96 int err;
97
98 pm = kzalloc(sizeof(struct pm), GFP_KERNEL);
99 input_dev = input_allocate_device();
100 if (!pm || !input_dev) {
101 err = -ENOMEM;
102 goto fail1;
103 }
104
105 pm->serio = serio;
106 pm->dev = input_dev;
107 snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys);
108
109 input_dev->private = pm;
110 input_dev->name = "Penmount Serial TouchScreen";
111 input_dev->phys = pm->phys;
112 input_dev->id.bustype = BUS_RS232;
113 input_dev->id.vendor = SERIO_PENMOUNT;
114 input_dev->id.product = 0;
115 input_dev->id.version = 0x0100;
116 input_dev->cdev.dev = &serio->dev;
117
118 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
119 input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
120 input_set_abs_params(pm->dev, ABS_X, 0, 0x3ff, 0, 0);
121 input_set_abs_params(pm->dev, ABS_Y, 0, 0x3ff, 0, 0);
122
123 serio_set_drvdata(serio, pm);
124
125 err = serio_open(serio, drv);
126 if (err)
127 goto fail2;
128
129 err = input_register_device(pm->dev);
130 if (err)
131 goto fail3;
132
133 return 0;
134
135 fail3: serio_close(serio);
136 fail2: serio_set_drvdata(serio, NULL);
137 fail1: input_free_device(input_dev);
138 kfree(pm);
139 return err;
140}
141
142/*
143 * The serio driver structure.
144 */
145
146static struct serio_device_id pm_serio_ids[] = {
147 {
148 .type = SERIO_RS232,
149 .proto = SERIO_PENMOUNT,
150 .id = SERIO_ANY,
151 .extra = SERIO_ANY,
152 },
153 { 0 }
154};
155
156MODULE_DEVICE_TABLE(serio, pm_serio_ids);
157
158static struct serio_driver pm_drv = {
159 .driver = {
160 .name = "penmountlpc",
161 },
162 .description = DRIVER_DESC,
163 .id_table = pm_serio_ids,
164 .interrupt = pm_interrupt,
165 .connect = pm_connect,
166 .disconnect = pm_disconnect,
167};
168
169/*
170 * The functions for inserting/removing us as a module.
171 */
172
173static int __init pm_init(void)
174{
175 serio_register_driver(&pm_drv);
176 return 0;
177}
178
179static void __exit pm_exit(void)
180{
181 serio_unregister_driver(&pm_drv);
182}
183
184module_init(pm_init);
185module_exit(pm_exit);