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 40 #include <asm/io.h> 41 #include <asm/uaccess.h> 42 #include <asm/q40_master.h> 43 #include <asm/irq.h> 44 #include <asm/q40ints.h> 45 46 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 47 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver"); 48 MODULE_LICENSE("GPL"); 49 50 static DEFINE_SPINLOCK(q40kbd_lock); 51 static struct serio *q40kbd_port; 52 static struct platform_device *q40kbd_device; 53 54 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id) 55 { 56 unsigned long flags; 57 58 spin_lock_irqsave(&q40kbd_lock, flags); 59 60 if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)) 61 serio_interrupt(q40kbd_port, master_inb(KEYCODE_REG), 0); 62 63 master_outb(-1, KEYBOARD_UNLOCK_REG); 64 65 spin_unlock_irqrestore(&q40kbd_lock, flags); 66 67 return IRQ_HANDLED; 68 } 69 70 /* 71 * q40kbd_flush() flushes all data that may be in the keyboard buffers 72 */ 73 74 static void q40kbd_flush(void) 75 { 76 int maxread = 100; 77 unsigned long flags; 78 79 spin_lock_irqsave(&q40kbd_lock, flags); 80 81 while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))) 82 master_inb(KEYCODE_REG); 83 84 spin_unlock_irqrestore(&q40kbd_lock, flags); 85 } 86 87 /* 88 * q40kbd_open() is called when a port is open by the higher layer. 89 * It allocates the interrupt and enables in in the chip. 90 */ 91 92 static int q40kbd_open(struct serio *port) 93 { 94 q40kbd_flush(); 95 96 if (request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, "q40kbd", NULL)) { 97 printk(KERN_ERR "q40kbd.c: Can't get irq %d.\n", Q40_IRQ_KEYBOARD); 98 return -EBUSY; 99 } 100 101 /* off we go */ 102 master_outb(-1, KEYBOARD_UNLOCK_REG); 103 master_outb(1, KEY_IRQ_ENABLE_REG); 104 105 return 0; 106 } 107 108 static void q40kbd_close(struct serio *port) 109 { 110 master_outb(0, KEY_IRQ_ENABLE_REG); 111 master_outb(-1, KEYBOARD_UNLOCK_REG); 112 free_irq(Q40_IRQ_KEYBOARD, NULL); 113 114 q40kbd_flush(); 115 } 116 117 static int __devinit q40kbd_probe(struct platform_device *dev) 118 { 119 q40kbd_port = kzalloc(sizeof(struct serio), GFP_KERNEL); 120 if (!q40kbd_port) 121 return -ENOMEM; 122 123 q40kbd_port->id.type = SERIO_8042; 124 q40kbd_port->open = q40kbd_open; 125 q40kbd_port->close = q40kbd_close; 126 q40kbd_port->dev.parent = &dev->dev; 127 strlcpy(q40kbd_port->name, "Q40 Kbd Port", sizeof(q40kbd_port->name)); 128 strlcpy(q40kbd_port->phys, "Q40", sizeof(q40kbd_port->phys)); 129 130 serio_register_port(q40kbd_port); 131 printk(KERN_INFO "serio: Q40 kbd registered\n"); 132 133 return 0; 134 } 135 136 static int __devexit q40kbd_remove(struct platform_device *dev) 137 { 138 serio_unregister_port(q40kbd_port); 139 140 return 0; 141 } 142 143 static struct platform_driver q40kbd_driver = { 144 .driver = { 145 .name = "q40kbd", 146 .owner = THIS_MODULE, 147 }, 148 .probe = q40kbd_probe, 149 .remove = __devexit_p(q40kbd_remove), 150 }; 151 152 static int __init q40kbd_init(void) 153 { 154 int error; 155 156 if (!MACH_IS_Q40) 157 return -ENODEV; 158 159 error = platform_driver_register(&q40kbd_driver); 160 if (error) 161 return error; 162 163 q40kbd_device = platform_device_alloc("q40kbd", -1); 164 if (!q40kbd_device) 165 goto err_unregister_driver; 166 167 error = platform_device_add(q40kbd_device); 168 if (error) 169 goto err_free_device; 170 171 return 0; 172 173 err_free_device: 174 platform_device_put(q40kbd_device); 175 err_unregister_driver: 176 platform_driver_unregister(&q40kbd_driver); 177 return error; 178 } 179 180 static void __exit q40kbd_exit(void) 181 { 182 platform_device_unregister(q40kbd_device); 183 platform_driver_unregister(&q40kbd_driver); 184 } 185 186 module_init(q40kbd_init); 187 module_exit(q40kbd_exit); 188