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1da177e4 LT |
1 | /* |
2 | * $Id: q40kbd.c,v 1.12 2002/02/02 22:26:44 vojtech Exp $ | |
3 | * | |
4 | * Copyright (c) 2000-2001 Vojtech Pavlik | |
5 | * | |
6 | * Based on the work of: | |
7 | * Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de> | |
8 | */ | |
9 | ||
10 | /* | |
11 | * Q40 PS/2 keyboard controller driver for Linux/m68k | |
12 | */ | |
13 | ||
14 | /* | |
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. | |
19 | * | |
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. | |
24 | * | |
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 | |
28 | * | |
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 | |
32 | */ | |
33 | ||
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> | |
40 | ||
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> | |
46 | ||
47 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
48 | MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver"); | |
49 | MODULE_LICENSE("GPL"); | |
50 | ||
51 | DEFINE_SPINLOCK(q40kbd_lock); | |
52 | static struct serio *q40kbd_port; | |
53 | static struct platform_device *q40kbd_device; | |
54 | ||
55 | static irqreturn_t q40kbd_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
56 | { | |
57 | unsigned long flags; | |
58 | ||
59 | spin_lock_irqsave(&q40kbd_lock, flags); | |
60 | ||
61 | if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)) | |
62 | serio_interrupt(q40kbd_port, master_inb(KEYCODE_REG), 0, regs); | |
63 | ||
64 | master_outb(-1, KEYBOARD_UNLOCK_REG); | |
65 | ||
66 | spin_unlock_irqrestore(&q40kbd_lock, flags); | |
67 | ||
68 | return IRQ_HANDLED; | |
69 | } | |
70 | ||
71 | /* | |
72 | * q40kbd_flush() flushes all data that may be in the keyboard buffers | |
73 | */ | |
74 | ||
75 | static void q40kbd_flush(void) | |
76 | { | |
77 | int maxread = 100; | |
78 | unsigned long flags; | |
79 | ||
80 | spin_lock_irqsave(&q40kbd_lock, flags); | |
81 | ||
82 | while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))) | |
83 | master_inb(KEYCODE_REG); | |
84 | ||
85 | spin_unlock_irqrestore(&q40kbd_lock, flags); | |
86 | } | |
87 | ||
88 | /* | |
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. | |
91 | */ | |
92 | ||
93 | static int q40kbd_open(struct serio *port) | |
94 | { | |
95 | q40kbd_flush(); | |
96 | ||
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; | |
100 | } | |
101 | ||
102 | /* off we go */ | |
103 | master_outb(-1, KEYBOARD_UNLOCK_REG); | |
104 | master_outb(1, KEY_IRQ_ENABLE_REG); | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static void q40kbd_close(struct serio *port) | |
110 | { | |
111 | master_outb(0, KEY_IRQ_ENABLE_REG); | |
112 | master_outb(-1, KEYBOARD_UNLOCK_REG); | |
113 | free_irq(Q40_IRQ_KEYBOARD, NULL); | |
114 | ||
115 | q40kbd_flush(); | |
116 | } | |
117 | ||
118 | static struct serio * __init q40kbd_allocate_port(void) | |
119 | { | |
120 | struct serio *serio; | |
121 | ||
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)); | |
131 | } | |
132 | ||
133 | return serio; | |
134 | } | |
135 | ||
136 | static int __init q40kbd_init(void) | |
137 | { | |
138 | if (!MACH_IS_Q40) | |
139 | return -EIO; | |
140 | ||
141 | q40kbd_device = platform_device_register_simple("q40kbd", -1, NULL, 0); | |
142 | if (IS_ERR(q40kbd_device)) | |
143 | return PTR_ERR(q40kbd_device); | |
144 | ||
145 | if (!(q40kbd_port = q40kbd_allocate_port())) { | |
146 | platform_device_unregister(q40kbd_device); | |
147 | return -ENOMEM; | |
148 | } | |
149 | ||
150 | serio_register_port(q40kbd_port); | |
151 | printk(KERN_INFO "serio: Q40 kbd registered\n"); | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | static void __exit q40kbd_exit(void) | |
157 | { | |
158 | serio_unregister_port(q40kbd_port); | |
159 | platform_device_unregister(q40kbd_device); | |
160 | } | |
161 | ||
162 | module_init(q40kbd_init); | |
163 | module_exit(q40kbd_exit); |