summaryrefslogtreecommitdiffstats
path: root/drivers/input/serio/q40kbd.c
blob: b44d255596c25db08eb1c184c29f4f4468e08f14 (plain)
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
/*
 * $Id: q40kbd.c,v 1.12 2002/02/02 22:26:44 vojtech Exp $
 *
 *  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/init.h>
#include <linux/serio.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/bitops.h>
#include <linux/platform_device.h>

#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/q40_master.h>
#include <asm/irq.h>
#include <asm/q40ints.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
MODULE_LICENSE("GPL");

DEFINE_SPINLOCK(q40kbd_lock);
static struct serio *q40kbd_port;
static struct platform_device *q40kbd_device;

static irqreturn_t q40kbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	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, regs);

	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(void)
{
 	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);
}

/*
 * 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)
{
	q40kbd_flush();

	if (request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, "q40kbd", NULL)) {
		printk(KERN_ERR "q40kbd.c: Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
		return -1;
	}

 	/* 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)
{
	master_outb(0, KEY_IRQ_ENABLE_REG);
	master_outb(-1, KEYBOARD_UNLOCK_REG);
	free_irq(Q40_IRQ_KEYBOARD, NULL);

	q40kbd_flush();
}

static struct serio * __init q40kbd_allocate_port(void)
{
	struct serio *serio;

	serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
	if (serio) {
		memset(serio, 0, sizeof(struct serio));
		serio->id.type		= SERIO_8042;
		serio->open		= q40kbd_open;
		serio->close		= q40kbd_close;
		serio->dev.parent	= &q40kbd_device->dev;
		strlcpy(serio->name, "Q40 Kbd Port", sizeof(serio->name));
		strlcpy(serio->phys, "Q40", sizeof(serio->phys));
	}

	return serio;
}

static int __init q40kbd_init(void)
{
	if (!MACH_IS_Q40)
		return -EIO;

	q40kbd_device = platform_device_register_simple("q40kbd", -1, NULL, 0);
	if (IS_ERR(q40kbd_device))
		return PTR_ERR(q40kbd_device);

	if (!(q40kbd_port = q40kbd_allocate_port())) {
		platform_device_unregister(q40kbd_device);
		return -ENOMEM;
	}

	serio_register_port(q40kbd_port);
	printk(KERN_INFO "serio: Q40 kbd registered\n");

	return 0;
}

static void __exit q40kbd_exit(void)
{
	serio_unregister_port(q40kbd_port);
	platform_device_unregister(q40kbd_device);
}

module_init(q40kbd_init);
module_exit(q40kbd_exit);
OpenPOWER on IntegriCloud