projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * $Id: q40kbd.c,v 1.12 2002/02/02 22:26:44 vojtech Exp $ | |
| 3 | * | |
| 4 | * Copyright (c) 2000-2001 Vojtech Pavlik | |
| 5 | * | |
| 6 | * Based on the work of: | |
| 7 | * Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de> | |
| 8 | */ | |
| 9 | ||
| 10 | /* | |
| 11 | * Q40 PS/2 keyboard controller driver for Linux/m68k | |
| 12 | */ | |
| 13 | ||
| 14 | /* | |
| 15 | * This program is free software; you can redistribute it and/or modify | |
| 16 | * it under the terms of the GNU General Public License as published by | |
| 17 | * the Free Software Foundation; either version 2 of the License, or | |
| 18 | * (at your option) any later version. | |
| 19 | * | |
| 20 | * This program is distributed in the hope that it will be useful, | |
| 21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 23 | * GNU General Public License for more details. | |
| 24 | * | |
| 25 | * You should have received a copy of the GNU General Public License | |
| 26 | * along with this program; if not, write to the Free Software | |
| 27 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 28 | * | |
| 29 | * Should you need to contact me, the author, you can do so either by | |
| 30 | * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: | |
| 31 | * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic | |
| 32 | */ | |
| 33 | ||
| 34 | #include <linux/module.h> | |
| 35 | #include <linux/init.h> | |
| 36 | #include <linux/serio.h> | |
| 37 | #include <linux/interrupt.h> | |
| 38 | #include <linux/err.h> | |
| 39 | #include <linux/bitops.h> | |
| d052d1be | 40 | #include <linux/platform_device.h> |
| 1da177e4 LT |
41 | |
| 42 | #include <asm/io.h> | |
| 43 | #include <asm/uaccess.h> | |
| 44 | #include <asm/q40_master.h> | |
| 45 | #include <asm/irq.h> | |
| 46 | #include <asm/q40ints.h> | |
| 47 | ||
| 48 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
| 49 | MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver"); | |
| 50 | MODULE_LICENSE("GPL"); | |
| 51 | ||
| 52 | DEFINE_SPINLOCK(q40kbd_lock); | |
| 53 | static struct serio *q40kbd_port; | |
| 54 | static struct platform_device *q40kbd_device; | |
| 55 | ||
| 56 | static irqreturn_t q40kbd_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
| 57 | { | |
| 58 | unsigned long flags; | |
| 59 | ||
| 60 | spin_lock_irqsave(&q40kbd_lock, flags); | |
| 61 | ||
| 62 | if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)) | |
| 63 | serio_interrupt(q40kbd_port, master_inb(KEYCODE_REG), 0, regs); | |
| 64 | ||
| 65 | master_outb(-1, KEYBOARD_UNLOCK_REG); | |
| 66 | ||
| 67 | spin_unlock_irqrestore(&q40kbd_lock, flags); | |
| 68 | ||
| 69 | return IRQ_HANDLED; | |
| 70 | } | |
| 71 | ||
| 72 | /* | |
| 73 | * q40kbd_flush() flushes all data that may be in the keyboard buffers | |
| 74 | */ | |
| 75 | ||
| 76 | static void q40kbd_flush(void) | |
| 77 | { | |
| 78 | int maxread = 100; | |
| 79 | unsigned long flags; | |
| 80 | ||
| 81 | spin_lock_irqsave(&q40kbd_lock, flags); | |
| 82 | ||
| 83 | while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))) | |
| 84 | master_inb(KEYCODE_REG); | |
| 85 | ||
| 86 | spin_unlock_irqrestore(&q40kbd_lock, flags); | |
| 87 | } | |
| 88 | ||
| 89 | /* | |
| 90 | * q40kbd_open() is called when a port is open by the higher layer. | |
| 91 | * It allocates the interrupt and enables in in the chip. | |
| 92 | */ | |
| 93 | ||
| 94 | static int q40kbd_open(struct serio *port) | |
| 95 | { | |
| 96 | q40kbd_flush(); | |
| 97 | ||
| 98 | if (request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, "q40kbd", NULL)) { | |
| 99 | printk(KERN_ERR "q40kbd.c: Can't get irq %d.\n", Q40_IRQ_KEYBOARD); | |
| 100 | return -1; | |
| 101 | } | |
| 102 | ||
| 103 | /* off we go */ | |
| 104 | master_outb(-1, KEYBOARD_UNLOCK_REG); | |
| 105 | master_outb(1, KEY_IRQ_ENABLE_REG); | |
| 106 | ||
| 107 | return 0; | |
| 108 | } | |
| 109 | ||
| 110 | static void q40kbd_close(struct serio *port) | |
| 111 | { | |
| 112 | master_outb(0, KEY_IRQ_ENABLE_REG); | |
| 113 | master_outb(-1, KEYBOARD_UNLOCK_REG); | |
| 114 | free_irq(Q40_IRQ_KEYBOARD, NULL); | |
| 115 | ||
| 116 | q40kbd_flush(); | |
| 117 | } | |
| 118 | ||
| 119 | static struct serio * __init q40kbd_allocate_port(void) | |
| 120 | { | |
| 121 | struct serio *serio; | |
| 122 | ||
| 123 | serio = kmalloc(sizeof(struct serio), GFP_KERNEL); | |
| 124 | if (serio) { | |
| 125 | memset(serio, 0, sizeof(struct serio)); | |
| 126 | serio->id.type = SERIO_8042; | |
| 127 | serio->open = q40kbd_open; | |
| 128 | serio->close = q40kbd_close; | |
| 129 | serio->dev.parent = &q40kbd_device->dev; | |
| 130 | strlcpy(serio->name, "Q40 Kbd Port", sizeof(serio->name)); | |
| 131 | strlcpy(serio->phys, "Q40", sizeof(serio->phys)); | |
| 132 | } | |
| 133 | ||
| 134 | return serio; | |
| 135 | } | |
| 136 | ||
| 137 | static int __init q40kbd_init(void) | |
| 138 | { | |
| 139 | if (!MACH_IS_Q40) | |
| 140 | return -EIO; | |
| 141 | ||
| 142 | q40kbd_device = platform_device_register_simple("q40kbd", -1, NULL, 0); | |
| 143 | if (IS_ERR(q40kbd_device)) | |
| 144 | return PTR_ERR(q40kbd_device); | |
| 145 | ||
| 146 | if (!(q40kbd_port = q40kbd_allocate_port())) { | |
| 147 | platform_device_unregister(q40kbd_device); | |
| 148 | return -ENOMEM; | |
| 149 | } | |
| 150 | ||
| 151 | serio_register_port(q40kbd_port); | |
| 152 | printk(KERN_INFO "serio: Q40 kbd registered\n"); | |
| 153 | ||
| 154 | return 0; | |
| 155 | } | |
| 156 | ||
| 157 | static void __exit q40kbd_exit(void) | |
| 158 | { | |
| 159 | serio_unregister_port(q40kbd_port); | |
| 160 | platform_device_unregister(q40kbd_device); | |
| 161 | } | |
| 162 | ||
| 163 | module_init(q40kbd_init); | |
| 164 | module_exit(q40kbd_exit); |