1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
/*
* Copyright (c) 2000-2001 Vojtech Pavlik
*
* Based on the work of:
* Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
*/
/*
* Q40 PS/2 keyboard controller driver for Linux/m68k
*/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Should you need to contact me, the author, you can do so either by
* e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
*/
#include <linux/module.h>
#include <linux/serio.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/bitops.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/q40_master.h>
#include <asm/irq.h>
#include <asm/q40ints.h>
#define DRV_NAME "q40kbd"
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
struct q40kbd {
struct serio *port;
spinlock_t lock;
};
static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
{
struct q40kbd *q40kbd = dev_id;
unsigned long flags;
spin_lock_irqsave(&q40kbd->lock, flags);
if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0);
master_outb(-1, KEYBOARD_UNLOCK_REG);
spin_unlock_irqrestore(&q40kbd->lock, flags);
return IRQ_HANDLED;
}
/*
* q40kbd_flush() flushes all data that may be in the keyboard buffers
*/
static void q40kbd_flush(struct q40kbd *q40kbd)
{
int maxread = 100;
unsigned long flags;
spin_lock_irqsave(&q40kbd->lock, flags);
while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
master_inb(KEYCODE_REG);
spin_unlock_irqrestore(&q40kbd->lock, flags);
}
static void q40kbd_stop(void)
{
master_outb(0, KEY_IRQ_ENABLE_REG);
master_outb(-1, KEYBOARD_UNLOCK_REG);
}
/*
* q40kbd_open() is called when a port is open by the higher layer.
* It allocates the interrupt and enables in in the chip.
*/
static int q40kbd_open(struct serio *port)
{
struct q40kbd *q40kbd = port->port_data;
q40kbd_flush(q40kbd);
/* off we go */
master_outb(-1, KEYBOARD_UNLOCK_REG);
master_outb(1, KEY_IRQ_ENABLE_REG);
return 0;
}
static void q40kbd_close(struct serio *port)
{
struct q40kbd *q40kbd = port->port_data;
q40kbd_stop();
q40kbd_flush(q40kbd);
}
static int q40kbd_probe(struct platform_device *pdev)
{
struct q40kbd *q40kbd;
struct serio *port;
int error;
q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL);
port = kzalloc(sizeof(struct serio), GFP_KERNEL);
if (!q40kbd || !port) {
error = -ENOMEM;
goto err_free_mem;
}
q40kbd->port = port;
spin_lock_init(&q40kbd->lock);
port->id.type = SERIO_8042;
port->open = q40kbd_open;
port->close = q40kbd_close;
port->port_data = q40kbd;
port->dev.parent = &pdev->dev;
strlcpy(port->name, "Q40 Kbd Port", sizeof(port->name));
strlcpy(port->phys, "Q40", sizeof(port->phys));
q40kbd_stop();
error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0,
DRV_NAME, q40kbd);
if (error) {
dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
goto err_free_mem;
}
serio_register_port(q40kbd->port);
platform_set_drvdata(pdev, q40kbd);
printk(KERN_INFO "serio: Q40 kbd registered\n");
return 0;
err_free_mem:
kfree(port);
kfree(q40kbd);
return error;
}
static int q40kbd_remove(struct platform_device *pdev)
{
struct q40kbd *q40kbd = platform_get_drvdata(pdev);
/*
* q40kbd_close() will be called as part of unregistering
* and will ensure that IRQ is turned off, so it is safe
* to unregister port first and free IRQ later.
*/
serio_unregister_port(q40kbd->port);
free_irq(Q40_IRQ_KEYBOARD, q40kbd);
kfree(q40kbd);
return 0;
}
static struct platform_driver q40kbd_driver = {
.driver = {
.name = "q40kbd",
},
.remove = q40kbd_remove,
};
module_platform_driver_probe(q40kbd_driver, q40kbd_probe);
|
