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 #include <linux/platform_device.h>
41
42 #include <asm/io.h>
43 #include <asm/uaccess.h>
44 #include <asm/q40_master.h>
45 #include <asm/irq.h>
46 #include <asm/q40ints.h>
47
48 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
49 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
50 MODULE_LICENSE("GPL");
51
52 DEFINE_SPINLOCK(q40kbd_lock);
53 static struct serio *q40kbd_port;
54 static struct platform_device *q40kbd_device;
55
56 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
57 {
58 unsigned long flags;
59
60 spin_lock_irqsave(&q40kbd_lock, flags);
61
62 if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
63 serio_interrupt(q40kbd_port, master_inb(KEYCODE_REG), 0);
64
65 master_outb(-1, KEYBOARD_UNLOCK_REG);
66
67 spin_unlock_irqrestore(&q40kbd_lock, flags);
68
69 return IRQ_HANDLED;
70 }
71
72 /*
73 * q40kbd_flush() flushes all data that may be in the keyboard buffers
74 */
75
76 static void q40kbd_flush(void)
77 {
78 int maxread = 100;
79 unsigned long flags;
80
81 spin_lock_irqsave(&q40kbd_lock, flags);
82
83 while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
84 master_inb(KEYCODE_REG);
85
86 spin_unlock_irqrestore(&q40kbd_lock, flags);
87 }
88
89 /*
90 * q40kbd_open() is called when a port is open by the higher layer.
91 * It allocates the interrupt and enables in in the chip.
92 */
93
94 static int q40kbd_open(struct serio *port)
95 {
96 q40kbd_flush();
97
98 if (request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, "q40kbd", NULL)) {
99 printk(KERN_ERR "q40kbd.c: Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
100 return -EBUSY;
101 }
102
103 /* off we go */
104 master_outb(-1, KEYBOARD_UNLOCK_REG);
105 master_outb(1, KEY_IRQ_ENABLE_REG);
106
107 return 0;
108 }
109
110 static void q40kbd_close(struct serio *port)
111 {
112 master_outb(0, KEY_IRQ_ENABLE_REG);
113 master_outb(-1, KEYBOARD_UNLOCK_REG);
114 free_irq(Q40_IRQ_KEYBOARD, NULL);
115
116 q40kbd_flush();
117 }
118
119 static int __devinit q40kbd_probe(struct platform_device *dev)
120 {
121 q40kbd_port = kzalloc(sizeof(struct serio), GFP_KERNEL);
122 if (!q40kbd_port)
123 return -ENOMEM;
124
125 q40kbd_port->id.type = SERIO_8042;
126 q40kbd_port->open = q40kbd_open;
127 q40kbd_port->close = q40kbd_close;
128 q40kbd_port->dev.parent = &dev->dev;
129 strlcpy(q40kbd_port->name, "Q40 Kbd Port", sizeof(q40kbd_port->name));
130 strlcpy(q40kbd_port->phys, "Q40", sizeof(q40kbd_port->phys));
131
132 serio_register_port(q40kbd_port);
133 printk(KERN_INFO "serio: Q40 kbd registered\n");
134
135 return 0;
136 }
137
138 static int __devexit q40kbd_remove(struct platform_device *dev)
139 {
140 serio_unregister_port(q40kbd_port);
141
142 return 0;
143 }
144
145 static struct platform_driver q40kbd_driver = {
146 .driver = {
147 .name = "q40kbd",
148 .owner = THIS_MODULE,
149 },
150 .probe = q40kbd_probe,
151 .remove = __devexit_p(q40kbd_remove),
152 };
153
154 static int __init q40kbd_init(void)
155 {
156 int error;
157
158 if (!MACH_IS_Q40)
159 return -EIO;
160
161 error = platform_driver_register(&q40kbd_driver);
162 if (error)
163 return error;
164
165 q40kbd_device = platform_device_alloc("q40kbd", -1);
166 if (!q40kbd_device)
167 goto err_unregister_driver;
168
169 error = platform_device_add(q40kbd_device);
170 if (error)
171 goto err_free_device;
172
173 return 0;
174
175 err_free_device:
176 platform_device_put(q40kbd_device);
177 err_unregister_driver:
178 platform_driver_unregister(&q40kbd_driver);
179 return error;
180 }
181
182 static void __exit q40kbd_exit(void)
183 {
184 platform_device_unregister(q40kbd_device);
185 platform_driver_unregister(&q40kbd_driver);
186 }
187
188 module_init(q40kbd_init);
189 module_exit(q40kbd_exit);
190
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