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> 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 51 DEFINE_SPINLOCK(q40kbd_lock); 52 static struct serio *q40kbd_port; 53 static struct platform_device *q40kbd_device; 54 55 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id, struct pt_regs *regs) 56 { 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, regs); 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 { 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 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); 99 return -1; 100 } 101 102 /* off we go */ 103 master_outb(-1, KEYBOARD_UNLOCK_REG); 104 master_outb(1, KEY_IRQ_ENABLE_REG); 105 106 return 0; 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 } 117 118 static struct serio * __init q40kbd_allocate_port(void) 119 { 120 struct serio *serio; 121 122 serio = kmalloc(sizeof(struct serio), GFP_KERNEL); 123 if (serio) { 124 memset(serio, 0, sizeof(struct serio)); 125 serio->id.type = SERIO_8042; 126 serio->open = q40kbd_open; 127 serio->close = q40kbd_close; 128 serio->dev.parent = &q40kbd_device->dev; 129 strlcpy(serio->name, "Q40 Kbd Port", sizeof(serio->name)); 130 strlcpy(serio->phys, "Q40", sizeof(serio->phys)); 131 } 132 133 return serio; 134 } 135 136 static int __init q40kbd_init(void) 137 { 138 if (!MACH_IS_Q40) 139 return -EIO; 140 141 q40kbd_device = platform_device_register_simple("q40kbd", -1, NULL, 0); 142 if (IS_ERR(q40kbd_device)) 143 return PTR_ERR(q40kbd_device); 144 145 if (!(q40kbd_port = q40kbd_allocate_port())) { 146 platform_device_unregister(q40kbd_device); 147 return -ENOMEM; 148 } 149 150 serio_register_port(q40kbd_port); 151 printk(KERN_INFO "serio: Q40 kbd registered\n"); 152 153 return 0; 154 } 155 156 static void __exit q40kbd_exit(void) 157 { 158 serio_unregister_port(q40kbd_port); 159 platform_device_unregister(q40kbd_device); 160 } 161 162 module_init(q40kbd_init); 163 module_exit(q40kbd_exit); 164