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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
28#include <linux/module.h>
29#include <linux/serio.h>
30#include <linux/interrupt.h>
31#include <linux/err.h>
32#include <linux/bitops.h>
33#include <linux/platform_device.h>
34#include <linux/slab.h>
35
36#include <asm/io.h>
37#include <linux/uaccess.h>
38#include <asm/q40_master.h>
39#include <asm/irq.h>
40#include <asm/q40ints.h>
41
42#define DRV_NAME "q40kbd"
43
44MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
45MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
46MODULE_LICENSE("GPL");
47MODULE_ALIAS("platform:" DRV_NAME);
48
49struct q40kbd {
50 struct serio *port;
51 spinlock_t lock;
52};
53
54static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
55{
56 struct q40kbd *q40kbd = dev_id;
57 unsigned long flags;
58
59 spin_lock_irqsave(&q40kbd->lock, flags);
60
61 if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
62 serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0);
63
64 master_outb(-1, KEYBOARD_UNLOCK_REG);
65
66 spin_unlock_irqrestore(&q40kbd->lock, flags);
67
68 return IRQ_HANDLED;
69}
70
71/*
72 * q40kbd_flush() flushes all data that may be in the keyboard buffers
73 */
74
75static void q40kbd_flush(struct q40kbd *q40kbd)
76{
77 int maxread = 100;
78 unsigned long flags;
79
80 spin_lock_irqsave(&q40kbd->lock, flags);
81
82 while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
83 master_inb(KEYCODE_REG);
84
85 spin_unlock_irqrestore(&q40kbd->lock, flags);
86}
87
88static void q40kbd_stop(void)
89{
90 master_outb(0, KEY_IRQ_ENABLE_REG);
91 master_outb(-1, KEYBOARD_UNLOCK_REG);
92}
93
94/*
95 * q40kbd_open() is called when a port is open by the higher layer.
96 * It allocates the interrupt and enables in in the chip.
97 */
98
99static int q40kbd_open(struct serio *port)
100{
101 struct q40kbd *q40kbd = port->port_data;
102
103 q40kbd_flush(q40kbd);
104
105 /* off we go */
106 master_outb(-1, KEYBOARD_UNLOCK_REG);
107 master_outb(1, KEY_IRQ_ENABLE_REG);
108
109 return 0;
110}
111
112static void q40kbd_close(struct serio *port)
113{
114 struct q40kbd *q40kbd = port->port_data;
115
116 q40kbd_stop();
117 q40kbd_flush(q40kbd);
118}
119
120static int q40kbd_probe(struct platform_device *pdev)
121{
122 struct q40kbd *q40kbd;
123 struct serio *port;
124 int error;
125
126 q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL);
127 port = kzalloc(sizeof(struct serio), GFP_KERNEL);
128 if (!q40kbd || !port) {
129 error = -ENOMEM;
130 goto err_free_mem;
131 }
132
133 q40kbd->port = port;
134 spin_lock_init(&q40kbd->lock);
135
136 port->id.type = SERIO_8042;
137 port->open = q40kbd_open;
138 port->close = q40kbd_close;
139 port->port_data = q40kbd;
140 port->dev.parent = &pdev->dev;
141 strlcpy(port->name, "Q40 Kbd Port", sizeof(port->name));
142 strlcpy(port->phys, "Q40", sizeof(port->phys));
143
144 q40kbd_stop();
145
146 error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0,
147 DRV_NAME, q40kbd);
148 if (error) {
149 dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
150 goto err_free_mem;
151 }
152
153 serio_register_port(q40kbd->port);
154
155 platform_set_drvdata(pdev, q40kbd);
156 printk(KERN_INFO "serio: Q40 kbd registered\n");
157
158 return 0;
159
160err_free_mem:
161 kfree(port);
162 kfree(q40kbd);
163 return error;
164}
165
166static int q40kbd_remove(struct platform_device *pdev)
167{
168 struct q40kbd *q40kbd = platform_get_drvdata(pdev);
169
170 /*
171 * q40kbd_close() will be called as part of unregistering
172 * and will ensure that IRQ is turned off, so it is safe
173 * to unregister port first and free IRQ later.
174 */
175 serio_unregister_port(q40kbd->port);
176 free_irq(Q40_IRQ_KEYBOARD, q40kbd);
177 kfree(q40kbd);
178
179 return 0;
180}
181
182static struct platform_driver q40kbd_driver = {
183 .driver = {
184 .name = "q40kbd",
185 },
186 .remove = q40kbd_remove,
187};
188
189module_platform_driver_probe(q40kbd_driver, q40kbd_probe);
190

Warning: That file was not part of the compilation database. It may have many parsing errors.