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 * 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> 38 #include <linux/platform_device.h> 39 #include <linux/slab.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 static 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) 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); 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 -EBUSY; 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 int __devinit q40kbd_probe(struct platform_device *dev) 119 { 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"); 133 134 return 0; 135 } 136 137 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 }; 152 153 static int __init q40kbd_init(void) 154 { 155 int error; 156 157 if (!MACH_IS_Q40) 158 return -ENODEV; 159 160 error = platform_driver_register(&q40kbd_driver); 161 if (error) 162 return error; 163 164 q40kbd_device = platform_device_alloc("q40kbd", -1); 165 if (!q40kbd_device) 166 goto err_unregister_driver; 167 168 error = platform_device_add(q40kbd_device); 169 if (error) 170 goto err_free_device; 171 172 return 0; 173 174 err_free_device: 175 platform_device_put(q40kbd_device); 176 err_unregister_driver: 177 platform_driver_unregister(&q40kbd_driver); 178 return error; 179 } 180 181 static void __exit q40kbd_exit(void) 182 { 183 platform_device_unregister(q40kbd_device); 184 platform_driver_unregister(&q40kbd_driver); 185 } 186 187 module_init(q40kbd_init); 188 module_exit(q40kbd_exit); 189