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 #include <linux/platform_device.h> 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); 165