2 * Copyright (c) 2000-2001 Vojtech Pavlik
4 * Based on the work of:
5 * Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
9 * Q40 PS/2 keyboard controller driver for Linux/m68k
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/serio.h>
34 #include <linux/interrupt.h>
35 #include <linux/err.h>
36 #include <linux/bitops.h>
37 #include <linux/platform_device.h>
38 #include <linux/slab.h>
41 #include <asm/uaccess.h>
42 #include <asm/q40_master.h>
44 #include <asm/q40ints.h>
46 #define DRV_NAME "q40kbd"
48 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
49 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
50 MODULE_LICENSE("GPL");
51 MODULE_ALIAS("platform:" DRV_NAME);
58 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
60 struct q40kbd *q40kbd = dev_id;
63 spin_lock_irqsave(&q40kbd->lock, flags);
65 if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
66 serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0);
68 master_outb(-1, KEYBOARD_UNLOCK_REG);
70 spin_unlock_irqrestore(&q40kbd->lock, flags);
76 * q40kbd_flush() flushes all data that may be in the keyboard buffers
79 static void q40kbd_flush(struct q40kbd *q40kbd)
84 spin_lock_irqsave(&q40kbd->lock, flags);
86 while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
87 master_inb(KEYCODE_REG);
89 spin_unlock_irqrestore(&q40kbd->lock, flags);
92 static void q40kbd_stop(void)
94 master_outb(0, KEY_IRQ_ENABLE_REG);
95 master_outb(-1, KEYBOARD_UNLOCK_REG);
99 * q40kbd_open() is called when a port is open by the higher layer.
100 * It allocates the interrupt and enables in in the chip.
103 static int q40kbd_open(struct serio *port)
105 struct q40kbd *q40kbd = port->port_data;
107 q40kbd_flush(q40kbd);
110 master_outb(-1, KEYBOARD_UNLOCK_REG);
111 master_outb(1, KEY_IRQ_ENABLE_REG);
116 static void q40kbd_close(struct serio *port)
118 struct q40kbd *q40kbd = port->port_data;
121 q40kbd_flush(q40kbd);
124 static int q40kbd_probe(struct platform_device *pdev)
126 struct q40kbd *q40kbd;
130 q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL);
131 port = kzalloc(sizeof(struct serio), GFP_KERNEL);
132 if (!q40kbd || !port) {
138 spin_lock_init(&q40kbd->lock);
140 port->id.type = SERIO_8042;
141 port->open = q40kbd_open;
142 port->close = q40kbd_close;
143 port->port_data = q40kbd;
144 port->dev.parent = &pdev->dev;
145 strlcpy(port->name, "Q40 Kbd Port", sizeof(port->name));
146 strlcpy(port->phys, "Q40", sizeof(port->phys));
150 error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0,
153 dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
157 serio_register_port(q40kbd->port);
159 platform_set_drvdata(pdev, q40kbd);
160 printk(KERN_INFO "serio: Q40 kbd registered\n");
170 static int q40kbd_remove(struct platform_device *pdev)
172 struct q40kbd *q40kbd = platform_get_drvdata(pdev);
175 * q40kbd_close() will be called as part of unregistering
176 * and will ensure that IRQ is turned off, so it is safe
177 * to unregister port first and free IRQ later.
179 serio_unregister_port(q40kbd->port);
180 free_irq(Q40_IRQ_KEYBOARD, q40kbd);
186 static struct platform_driver q40kbd_driver = {
190 .remove = q40kbd_remove,
193 module_platform_driver_probe(q40kbd_driver, q40kbd_probe);