Linux-2.6.12-rc2
[linux-2.6/kvm.git] / drivers / input / serio / q40kbd.c
blob46093c507988e002fa8ee8abf198cd397721d396
1 /*
2 * $Id: q40kbd.c,v 1.12 2002/02/02 22:26:44 vojtech Exp $
4 * Copyright (c) 2000-2001 Vojtech Pavlik
6 * Based on the work of:
7 * Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
8 */
11 * Q40 PS/2 keyboard controller driver for Linux/m68k
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 * Should you need to contact me, the author, you can do so either by
30 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
31 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
34 #include <linux/module.h>
35 #include <linux/init.h>
36 #include <linux/serio.h>
37 #include <linux/interrupt.h>
38 #include <linux/err.h>
39 #include <linux/bitops.h>
41 #include <asm/io.h>
42 #include <asm/uaccess.h>
43 #include <asm/q40_master.h>
44 #include <asm/irq.h>
45 #include <asm/q40ints.h>
47 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
48 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
49 MODULE_LICENSE("GPL");
51 DEFINE_SPINLOCK(q40kbd_lock);
52 static struct serio *q40kbd_port;
53 static struct platform_device *q40kbd_device;
55 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
57 unsigned long flags;
59 spin_lock_irqsave(&q40kbd_lock, flags);
61 if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
62 serio_interrupt(q40kbd_port, master_inb(KEYCODE_REG), 0, regs);
64 master_outb(-1, KEYBOARD_UNLOCK_REG);
66 spin_unlock_irqrestore(&q40kbd_lock, flags);
68 return IRQ_HANDLED;
72 * q40kbd_flush() flushes all data that may be in the keyboard buffers
75 static void q40kbd_flush(void)
77 int maxread = 100;
78 unsigned long flags;
80 spin_lock_irqsave(&q40kbd_lock, flags);
82 while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
83 master_inb(KEYCODE_REG);
85 spin_unlock_irqrestore(&q40kbd_lock, flags);
89 * q40kbd_open() is called when a port is open by the higher layer.
90 * It allocates the interrupt and enables in in the chip.
93 static int q40kbd_open(struct serio *port)
95 q40kbd_flush();
97 if (request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, "q40kbd", NULL)) {
98 printk(KERN_ERR "q40kbd.c: Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
99 return -1;
102 /* off we go */
103 master_outb(-1, KEYBOARD_UNLOCK_REG);
104 master_outb(1, KEY_IRQ_ENABLE_REG);
106 return 0;
109 static void q40kbd_close(struct serio *port)
111 master_outb(0, KEY_IRQ_ENABLE_REG);
112 master_outb(-1, KEYBOARD_UNLOCK_REG);
113 free_irq(Q40_IRQ_KEYBOARD, NULL);
115 q40kbd_flush();
118 static struct serio * __init q40kbd_allocate_port(void)
120 struct serio *serio;
122 serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
123 if (serio) {
124 memset(serio, 0, sizeof(struct serio));
125 serio->id.type = SERIO_8042;
126 serio->open = q40kbd_open;
127 serio->close = q40kbd_close;
128 serio->dev.parent = &q40kbd_device->dev;
129 strlcpy(serio->name, "Q40 Kbd Port", sizeof(serio->name));
130 strlcpy(serio->phys, "Q40", sizeof(serio->phys));
133 return serio;
136 static int __init q40kbd_init(void)
138 if (!MACH_IS_Q40)
139 return -EIO;
141 q40kbd_device = platform_device_register_simple("q40kbd", -1, NULL, 0);
142 if (IS_ERR(q40kbd_device))
143 return PTR_ERR(q40kbd_device);
145 if (!(q40kbd_port = q40kbd_allocate_port())) {
146 platform_device_unregister(q40kbd_device);
147 return -ENOMEM;
150 serio_register_port(q40kbd_port);
151 printk(KERN_INFO "serio: Q40 kbd registered\n");
153 return 0;
156 static void __exit q40kbd_exit(void)
158 serio_unregister_port(q40kbd_port);
159 platform_device_unregister(q40kbd_device);
162 module_init(q40kbd_init);
163 module_exit(q40kbd_exit);