xref: /openbmc/linux/drivers/input/serio/q40kbd.c (revision 22246614)
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