/* * $Id: q40kbd.c,v 1.12 2002/02/02 22:26:44 vojtech Exp $ * * Copyright (c) 2000-2001 Vojtech Pavlik * * Based on the work of: * Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de> */ /* * Q40 PS/2 keyboard controller driver for Linux/m68k */ /* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * Should you need to contact me, the author, you can do so either by * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic */ #include <linux/module.h> #include <linux/init.h> #include <linux/serio.h> #include <linux/interrupt.h> #include <linux/err.h> #include <linux/bitops.h> #include <linux/platform_device.h> #include <asm/io.h> #include <asm/uaccess.h> #include <asm/q40_master.h> #include <asm/irq.h> #include <asm/q40ints.h> MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver"); MODULE_LICENSE("GPL"); DEFINE_SPINLOCK(q40kbd_lock); static struct serio *q40kbd_port; static struct platform_device *q40kbd_device; static irqreturn_t q40kbd_interrupt(int irq, void *dev_id) { unsigned long flags; spin_lock_irqsave(&q40kbd_lock, flags); if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)) serio_interrupt(q40kbd_port, master_inb(KEYCODE_REG), 0); master_outb(-1, KEYBOARD_UNLOCK_REG); spin_unlock_irqrestore(&q40kbd_lock, flags); return IRQ_HANDLED; } /* * q40kbd_flush() flushes all data that may be in the keyboard buffers */ static void q40kbd_flush(void) { int maxread = 100; unsigned long flags; spin_lock_irqsave(&q40kbd_lock, flags); while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))) master_inb(KEYCODE_REG); spin_unlock_irqrestore(&q40kbd_lock, flags); } /* * q40kbd_open() is called when a port is open by the higher layer. * It allocates the interrupt and enables in in the chip. */ static int q40kbd_open(struct serio *port) { q40kbd_flush(); if (request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0, "q40kbd", NULL)) { printk(KERN_ERR "q40kbd.c: Can't get irq %d.\n", Q40_IRQ_KEYBOARD); return -EBUSY; } /* off we go */ master_outb(-1, KEYBOARD_UNLOCK_REG); master_outb(1, KEY_IRQ_ENABLE_REG); return 0; } static void q40kbd_close(struct serio *port) { master_outb(0, KEY_IRQ_ENABLE_REG); master_outb(-1, KEYBOARD_UNLOCK_REG); free_irq(Q40_IRQ_KEYBOARD, NULL); q40kbd_flush(); } static int __devinit q40kbd_probe(struct platform_device *dev) { q40kbd_port = kzalloc(sizeof(struct serio), GFP_KERNEL); if (!q40kbd_port) return -ENOMEM; q40kbd_port->id.type = SERIO_8042; q40kbd_port->open = q40kbd_open; q40kbd_port->close = q40kbd_close; q40kbd_port->dev.parent = &dev->dev; strlcpy(q40kbd_port->name, "Q40 Kbd Port", sizeof(q40kbd_port->name)); strlcpy(q40kbd_port->phys, "Q40", sizeof(q40kbd_port->phys)); serio_register_port(q40kbd_port); printk(KERN_INFO "serio: Q40 kbd registered\n"); return 0; } static int __devexit q40kbd_remove(struct platform_device *dev) { serio_unregister_port(q40kbd_port); return 0; } static struct platform_driver q40kbd_driver = { .driver = { .name = "q40kbd", .owner = THIS_MODULE, }, .probe = q40kbd_probe, .remove = __devexit_p(q40kbd_remove), }; static int __init q40kbd_init(void) { int error; if (!MACH_IS_Q40) return -EIO; error = platform_driver_register(&q40kbd_driver); if (error) return error; q40kbd_device = platform_device_alloc("q40kbd", -1); if (!q40kbd_device) goto err_unregister_driver; error = platform_device_add(q40kbd_device); if (error) goto err_free_device; return 0; err_free_device: platform_device_put(q40kbd_device); err_unregister_driver: platform_driver_unregister(&q40kbd_driver); return error; } static void __exit q40kbd_exit(void) { platform_device_unregister(q40kbd_device); platform_driver_unregister(&q40kbd_driver); } module_init(q40kbd_init); module_exit(q40kbd_exit);