1/*
2 *  Copyright (c) 2000-2001 Vojtech Pavlik
3 *
4 *  Based on the work of:
5 *	Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
6 */
7
8/*
9 * Q40 PS/2 keyboard controller driver for Linux/m68k
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/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>
39
40#include <asm/io.h>
41#include <asm/uaccess.h>
42#include <asm/q40_master.h>
43#include <asm/irq.h>
44#include <asm/q40ints.h>
45
46#define DRV_NAME	"q40kbd"
47
48MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
49MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
50MODULE_LICENSE("GPL");
51MODULE_ALIAS("platform:" DRV_NAME);
52
53struct q40kbd {
54	struct serio *port;
55	spinlock_t lock;
56};
57
58static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
59{
60	struct q40kbd *q40kbd = dev_id;
61	unsigned long flags;
62
63	spin_lock_irqsave(&q40kbd->lock, flags);
64
65	if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
66		serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0);
67
68	master_outb(-1, KEYBOARD_UNLOCK_REG);
69
70	spin_unlock_irqrestore(&q40kbd->lock, flags);
71
72	return IRQ_HANDLED;
73}
74
75/*
76 * q40kbd_flush() flushes all data that may be in the keyboard buffers
77 */
78
79static void q40kbd_flush(struct q40kbd *q40kbd)
80{
81	int maxread = 100;
82	unsigned long flags;
83
84	spin_lock_irqsave(&q40kbd->lock, flags);
85
86	while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
87		master_inb(KEYCODE_REG);
88
89	spin_unlock_irqrestore(&q40kbd->lock, flags);
90}
91
92static void q40kbd_stop(void)
93{
94	master_outb(0, KEY_IRQ_ENABLE_REG);
95	master_outb(-1, KEYBOARD_UNLOCK_REG);
96}
97
98/*
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.
101 */
102
103static int q40kbd_open(struct serio *port)
104{
105	struct q40kbd *q40kbd = port->port_data;
106
107	q40kbd_flush(q40kbd);
108
109	/* off we go */
110	master_outb(-1, KEYBOARD_UNLOCK_REG);
111	master_outb(1, KEY_IRQ_ENABLE_REG);
112
113	return 0;
114}
115
116static void q40kbd_close(struct serio *port)
117{
118	struct q40kbd *q40kbd = port->port_data;
119
120	q40kbd_stop();
121	q40kbd_flush(q40kbd);
122}
123
124static int q40kbd_probe(struct platform_device *pdev)
125{
126	struct q40kbd *q40kbd;
127	struct serio *port;
128	int error;
129
130	q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL);
131	port = kzalloc(sizeof(struct serio), GFP_KERNEL);
132	if (!q40kbd || !port) {
133		error = -ENOMEM;
134		goto err_free_mem;
135	}
136
137	q40kbd->port = port;
138	spin_lock_init(&q40kbd->lock);
139
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));
147
148	q40kbd_stop();
149
150	error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0,
151			    DRV_NAME, q40kbd);
152	if (error) {
153		dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
154		goto err_free_mem;
155	}
156
157	serio_register_port(q40kbd->port);
158
159	platform_set_drvdata(pdev, q40kbd);
160	printk(KERN_INFO "serio: Q40 kbd registered\n");
161
162	return 0;
163
164err_free_mem:
165	kfree(port);
166	kfree(q40kbd);
167	return error;
168}
169
170static int q40kbd_remove(struct platform_device *pdev)
171{
172	struct q40kbd *q40kbd = platform_get_drvdata(pdev);
173
174	/*
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.
178	 */
179	serio_unregister_port(q40kbd->port);
180	free_irq(Q40_IRQ_KEYBOARD, q40kbd);
181	kfree(q40kbd);
182
183	return 0;
184}
185
186static struct platform_driver q40kbd_driver = {
187	.driver		= {
188		.name	= "q40kbd",
189	},
190	.remove		= q40kbd_remove,
191};
192
193module_platform_driver_probe(q40kbd_driver, q40kbd_probe);
194