Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
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/init.h> | |
34 | #include <linux/serio.h> | |
35 | #include <linux/interrupt.h> | |
36 | #include <linux/err.h> | |
37 | #include <linux/bitops.h> | |
d052d1be | 38 | #include <linux/platform_device.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
1da177e4 LT |
40 | |
41 | #include <asm/io.h> | |
42 | #include <asm/uaccess.h> | |
43 | #include <asm/q40_master.h> | |
44 | #include <asm/irq.h> | |
45 | #include <asm/q40ints.h> | |
46 | ||
47 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
48 | MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver"); | |
49 | MODULE_LICENSE("GPL"); | |
50 | ||
4ad88901 | 51 | static DEFINE_SPINLOCK(q40kbd_lock); |
1da177e4 LT |
52 | static struct serio *q40kbd_port; |
53 | static struct platform_device *q40kbd_device; | |
54 | ||
7d12e780 | 55 | static irqreturn_t q40kbd_interrupt(int irq, void *dev_id) |
1da177e4 LT |
56 | { |
57 | unsigned long flags; | |
58 | ||
59 | spin_lock_irqsave(&q40kbd_lock, flags); | |
60 | ||
61 | if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)) | |
7d12e780 | 62 | serio_interrupt(q40kbd_port, master_inb(KEYCODE_REG), 0); |
1da177e4 LT |
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 | ||
75 | static void q40kbd_flush(void) | |
76 | { | |
26421c7a | 77 | int maxread = 100; |
1da177e4 LT |
78 | unsigned long flags; |
79 | ||
80 | spin_lock_irqsave(&q40kbd_lock, flags); | |
81 | ||
26421c7a DT |
82 | while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))) |
83 | master_inb(KEYCODE_REG); | |
1da177e4 LT |
84 | |
85 | spin_unlock_irqrestore(&q40kbd_lock, flags); | |
86 | } | |
87 | ||
88 | /* | |
89 | * q40kbd_open() is called when a port is open by the higher layer. | |
90 | * It allocates the interrupt and enables in in the chip. | |
91 | */ | |
92 | ||
93 | static int q40kbd_open(struct serio *port) | |
94 | { | |
95 | q40kbd_flush(); | |
96 | ||
97 | if (request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, "q40kbd", NULL)) { | |
98 | printk(KERN_ERR "q40kbd.c: Can't get irq %d.\n", Q40_IRQ_KEYBOARD); | |
26421c7a | 99 | return -EBUSY; |
1da177e4 LT |
100 | } |
101 | ||
26421c7a DT |
102 | /* off we go */ |
103 | master_outb(-1, KEYBOARD_UNLOCK_REG); | |
104 | master_outb(1, KEY_IRQ_ENABLE_REG); | |
1da177e4 | 105 | |
26421c7a | 106 | return 0; |
1da177e4 LT |
107 | } |
108 | ||
109 | static void q40kbd_close(struct serio *port) | |
110 | { | |
111 | master_outb(0, KEY_IRQ_ENABLE_REG); | |
112 | master_outb(-1, KEYBOARD_UNLOCK_REG); | |
113 | free_irq(Q40_IRQ_KEYBOARD, NULL); | |
114 | ||
115 | q40kbd_flush(); | |
116 | } | |
117 | ||
26421c7a | 118 | static int __devinit q40kbd_probe(struct platform_device *dev) |
1da177e4 | 119 | { |
26421c7a DT |
120 | q40kbd_port = kzalloc(sizeof(struct serio), GFP_KERNEL); |
121 | if (!q40kbd_port) | |
122 | return -ENOMEM; | |
123 | ||
124 | q40kbd_port->id.type = SERIO_8042; | |
125 | q40kbd_port->open = q40kbd_open; | |
126 | q40kbd_port->close = q40kbd_close; | |
127 | q40kbd_port->dev.parent = &dev->dev; | |
128 | strlcpy(q40kbd_port->name, "Q40 Kbd Port", sizeof(q40kbd_port->name)); | |
129 | strlcpy(q40kbd_port->phys, "Q40", sizeof(q40kbd_port->phys)); | |
130 | ||
131 | serio_register_port(q40kbd_port); | |
132 | printk(KERN_INFO "serio: Q40 kbd registered\n"); | |
1da177e4 | 133 | |
26421c7a | 134 | return 0; |
1da177e4 LT |
135 | } |
136 | ||
26421c7a DT |
137 | static int __devexit q40kbd_remove(struct platform_device *dev) |
138 | { | |
139 | serio_unregister_port(q40kbd_port); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | static struct platform_driver q40kbd_driver = { | |
145 | .driver = { | |
146 | .name = "q40kbd", | |
147 | .owner = THIS_MODULE, | |
148 | }, | |
149 | .probe = q40kbd_probe, | |
150 | .remove = __devexit_p(q40kbd_remove), | |
151 | }; | |
152 | ||
1da177e4 LT |
153 | static int __init q40kbd_init(void) |
154 | { | |
26421c7a DT |
155 | int error; |
156 | ||
1da177e4 | 157 | if (!MACH_IS_Q40) |
fd5b462f | 158 | return -ENODEV; |
1da177e4 | 159 | |
26421c7a DT |
160 | error = platform_driver_register(&q40kbd_driver); |
161 | if (error) | |
162 | return error; | |
1da177e4 | 163 | |
26421c7a DT |
164 | q40kbd_device = platform_device_alloc("q40kbd", -1); |
165 | if (!q40kbd_device) | |
166 | goto err_unregister_driver; | |
1da177e4 | 167 | |
26421c7a DT |
168 | error = platform_device_add(q40kbd_device); |
169 | if (error) | |
170 | goto err_free_device; | |
1da177e4 LT |
171 | |
172 | return 0; | |
26421c7a DT |
173 | |
174 | err_free_device: | |
175 | platform_device_put(q40kbd_device); | |
176 | err_unregister_driver: | |
177 | platform_driver_unregister(&q40kbd_driver); | |
178 | return error; | |
1da177e4 LT |
179 | } |
180 | ||
181 | static void __exit q40kbd_exit(void) | |
182 | { | |
1da177e4 | 183 | platform_device_unregister(q40kbd_device); |
26421c7a | 184 | platform_driver_unregister(&q40kbd_driver); |
1da177e4 LT |
185 | } |
186 | ||
187 | module_init(q40kbd_init); | |
188 | module_exit(q40kbd_exit); |