2 * $Id: rpckbd.c,v 1.7 2001/09/25 10:12:07 vojtech Exp $
4 * Copyright (c) 2000-2001 Vojtech Pavlik
5 * Copyright (c) 2002 Russell King
9 * Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM
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.
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.
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
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
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>
39 #include <asm/hardware.h>
41 #include <asm/hardware/iomd.h>
42 #include <asm/system.h>
44 MODULE_AUTHOR("Vojtech Pavlik, Russell King");
45 MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
46 MODULE_LICENSE("GPL");
48 static struct serio *rpckbd_port;
49 static struct platform_device *rpckbd_device;
51 static int rpckbd_write(struct serio *port, unsigned char val)
53 while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
56 iomd_writeb(val, IOMD_KARTTX);
61 static irqreturn_t rpckbd_rx(int irq, void *dev_id, struct pt_regs *regs)
63 struct serio *port = dev_id;
65 int handled = IRQ_NONE;
67 while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
68 byte = iomd_readb(IOMD_KARTRX);
70 serio_interrupt(port, byte, 0, regs);
71 handled = IRQ_HANDLED;
76 static irqreturn_t rpckbd_tx(int irq, void *dev_id, struct pt_regs *regs)
81 static int rpckbd_open(struct serio *port)
83 /* Reset the keyboard state machine. */
84 iomd_writeb(0, IOMD_KCTRL);
85 iomd_writeb(8, IOMD_KCTRL);
86 iomd_readb(IOMD_KARTRX);
88 if (request_irq(IRQ_KEYBOARDRX, rpckbd_rx, 0, "rpckbd", port) != 0) {
89 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
93 if (request_irq(IRQ_KEYBOARDTX, rpckbd_tx, 0, "rpckbd", port) != 0) {
94 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
95 free_irq(IRQ_KEYBOARDRX, NULL);
102 static void rpckbd_close(struct serio *port)
104 free_irq(IRQ_KEYBOARDRX, port);
105 free_irq(IRQ_KEYBOARDTX, port);
109 * Allocate and initialize serio structure for subsequent registration
113 static struct serio * __init rpckbd_allocate_port(void)
117 serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
119 memset(serio, 0, sizeof(struct serio));
120 serio->type = SERIO_8042;
121 serio->write = rpckbd_write;
122 serio->open = rpckbd_open;
123 serio->close = rpckbd_close;
124 serio->dev.parent = &rpckbd_device->dev;
125 strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
126 strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
132 static int __init rpckbd_init(void)
134 rpckbd_device = platform_device_register_simple("rpckbd", -1, NULL, 0);
135 if (IS_ERR(rpckbd_device))
136 return PTR_ERR(rpckbd_device);
138 if (!(rpckbd_port = rpckbd_allocate_port())) {
139 platform_device_unregister(rpckbd_device);
143 serio_register_port(rpckbd_port);
147 static void __exit rpckbd_exit(void)
149 serio_unregister_port(rpckbd_port);
150 platform_device_unregister(rpckbd_device);
153 module_init(rpckbd_init);
154 module_exit(rpckbd_exit);