1/*
2 * $Id: rpckbd.c,v 1.1.1.1 2007/08/03 18:52:34 Exp $
3 *
4 *  Copyright (c) 2000-2001 Vojtech Pavlik
5 *  Copyright (c) 2002 Russell King
6 */
7
8/*
9 * Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM
10 */
11
12/*
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 *
27 * Should you need to contact me, the author, you can do so either by
28 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
29 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
30 */
31
32#include <linux/module.h>
33#include <linux/interrupt.h>
34#include <linux/init.h>
35#include <linux/serio.h>
36#include <linux/err.h>
37#include <linux/platform_device.h>
38
39#include <asm/irq.h>
40#include <asm/hardware.h>
41#include <asm/io.h>
42#include <asm/hardware/iomd.h>
43#include <asm/system.h>
44
45MODULE_AUTHOR("Vojtech Pavlik, Russell King");
46MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
47MODULE_LICENSE("GPL");
48
49static int rpckbd_write(struct serio *port, unsigned char val)
50{
51	while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
52		cpu_relax();
53
54	iomd_writeb(val, IOMD_KARTTX);
55
56	return 0;
57}
58
59static irqreturn_t rpckbd_rx(int irq, void *dev_id)
60{
61	struct serio *port = dev_id;
62	unsigned int byte;
63	int handled = IRQ_NONE;
64
65	while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
66		byte = iomd_readb(IOMD_KARTRX);
67
68		serio_interrupt(port, byte, 0);
69		handled = IRQ_HANDLED;
70	}
71	return handled;
72}
73
74static irqreturn_t rpckbd_tx(int irq, void *dev_id)
75{
76	return IRQ_HANDLED;
77}
78
79static int rpckbd_open(struct serio *port)
80{
81	/* Reset the keyboard state machine. */
82	iomd_writeb(0, IOMD_KCTRL);
83	iomd_writeb(8, IOMD_KCTRL);
84	iomd_readb(IOMD_KARTRX);
85
86	if (request_irq(IRQ_KEYBOARDRX, rpckbd_rx, 0, "rpckbd", port) != 0) {
87		printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
88		return -EBUSY;
89	}
90
91	if (request_irq(IRQ_KEYBOARDTX, rpckbd_tx, 0, "rpckbd", port) != 0) {
92		printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
93		free_irq(IRQ_KEYBOARDRX, NULL);
94		return -EBUSY;
95	}
96
97	return 0;
98}
99
100static void rpckbd_close(struct serio *port)
101{
102	free_irq(IRQ_KEYBOARDRX, port);
103	free_irq(IRQ_KEYBOARDTX, port);
104}
105
106/*
107 * Allocate and initialize serio structure for subsequent registration
108 * with serio core.
109 */
110static int __devinit rpckbd_probe(struct platform_device *dev)
111{
112	struct serio *serio;
113
114	serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
115	if (!serio)
116		return -ENOMEM;
117
118	serio->id.type		= SERIO_8042;
119	serio->write		= rpckbd_write;
120	serio->open		= rpckbd_open;
121	serio->close		= rpckbd_close;
122	serio->dev.parent	= &dev->dev;
123	strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
124	strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
125
126	platform_set_drvdata(dev, serio);
127	serio_register_port(serio);
128	return 0;
129}
130
131static int __devexit rpckbd_remove(struct platform_device *dev)
132{
133	struct serio *serio = platform_get_drvdata(dev);
134	serio_unregister_port(serio);
135	return 0;
136}
137
138static struct platform_driver rpckbd_driver = {
139	.probe		= rpckbd_probe,
140	.remove		= __devexit_p(rpckbd_remove),
141	.driver		= {
142		.name	= "kart",
143	},
144};
145
146static int __init rpckbd_init(void)
147{
148	return platform_driver_register(&rpckbd_driver);
149}
150
151static void __exit rpckbd_exit(void)
152{
153	platform_driver_unregister(&rpckbd_driver);
154}
155
156module_init(rpckbd_init);
157module_exit(rpckbd_exit);
158