2 * $Id: parkbd.c,v 1.10 2002/03/13 10:09:20 vojtech Exp $
4 * Copyright (c) 1999-2001 Vojtech Pavlik
8 * Parallel port to Keyboard port adapter driver for Linux
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 * Should you need to contact me, the author, you can do so either by
27 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
28 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
31 #include <linux/module.h>
32 #include <linux/parport.h>
33 #include <linux/init.h>
34 #include <linux/serio.h>
36 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
37 MODULE_DESCRIPTION("Parallel port to Keyboard port adapter driver");
38 MODULE_LICENSE("GPL");
40 static unsigned int parkbd_pp_no;
41 module_param_named(port, parkbd_pp_no, int, 0);
42 MODULE_PARM_DESC(port, "Parallel port the adapter is connected to (default is 0)");
44 static unsigned int parkbd_mode = SERIO_8042;
45 module_param_named(mode, parkbd_mode, uint, 0);
46 MODULE_PARM_DESC(mode, "Mode of operation: XT = 0/AT = 1 (default)");
48 #define PARKBD_CLOCK 0x01 /* Strobe & Ack */
49 #define PARKBD_DATA 0x02 /* AutoFd & Busy */
51 static int parkbd_buffer;
52 static int parkbd_counter;
53 static unsigned long parkbd_last;
54 static int parkbd_writing;
55 static unsigned long parkbd_start;
57 static struct pardevice *parkbd_dev;
58 static struct serio *parkbd_port;
60 static int parkbd_readlines(void)
62 return (parport_read_status(parkbd_dev->port) >> 6) ^ 2;
65 static void parkbd_writelines(int data)
67 parport_write_control(parkbd_dev->port, (~data & 3) | 0x10);
70 static int parkbd_write(struct serio *port, unsigned char c)
74 if (!parkbd_mode) return -1;
82 parkbd_buffer = c | (((int) (~p & 1)) << 8) | 0x600;
89 static void parkbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
94 if (parkbd_counter && ((parkbd_counter == 11) || time_after(jiffies, parkbd_last + HZ/100))) {
102 parkbd_writelines(((parkbd_buffer >> parkbd_counter++) & 1) | 2);
104 if (parkbd_counter == 11) {
108 parkbd_writelines(3);
113 if ((parkbd_counter == parkbd_mode + 10) || time_after(jiffies, parkbd_last + HZ/100)) {
118 parkbd_buffer |= (parkbd_readlines() >> 1) << parkbd_counter++;
120 if (parkbd_counter == parkbd_mode + 10)
121 serio_interrupt(parkbd_port, (parkbd_buffer >> (2 - parkbd_mode)) & 0xff, 0, regs);
124 parkbd_last = jiffies;
127 static int parkbd_getport(void)
131 pp = parport_find_number(parkbd_pp_no);
134 printk(KERN_ERR "parkbd: no such parport\n");
138 parkbd_dev = parport_register_device(pp, "parkbd", NULL, NULL, parkbd_interrupt, PARPORT_DEV_EXCL, NULL);
139 parport_put_port(pp);
144 if (parport_claim(parkbd_dev)) {
145 parport_unregister_device(parkbd_dev);
149 parkbd_start = jiffies;
154 static struct serio * __init parkbd_allocate_serio(void)
158 serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
160 memset(serio, 0, sizeof(struct serio));
161 serio->type = parkbd_mode;
162 serio->write = parkbd_write,
163 strlcpy(serio->name, "PARKBD AT/XT keyboard adapter", sizeof(serio->name));
164 snprintf(serio->phys, sizeof(serio->phys), "%s/serio0", parkbd_dev->port->name);
170 int __init parkbd_init(void)
174 err = parkbd_getport();
178 parkbd_port = parkbd_allocate_serio();
180 parport_release(parkbd_dev);
184 parkbd_writelines(3);
186 serio_register_port(parkbd_port);
188 printk(KERN_INFO "serio: PARKBD %s adapter on %s\n",
189 parkbd_mode ? "AT" : "XT", parkbd_dev->port->name);
194 void __exit parkbd_exit(void)
196 parport_release(parkbd_dev);
197 serio_unregister_port(parkbd_port);
198 parport_unregister_device(parkbd_dev);
201 module_init(parkbd_init);
202 module_exit(parkbd_exit);