diff options
Diffstat (limited to 'drivers/input/serio/q40kbd.c')
| -rw-r--r-- | drivers/input/serio/q40kbd.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/drivers/input/serio/q40kbd.c b/drivers/input/serio/q40kbd.c new file mode 100644 index 00000000000..46093c50798 --- /dev/null +++ b/drivers/input/serio/q40kbd.c @@ -0,0 +1,163 @@ +/* + * $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 <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, struct pt_regs *regs) +{ + 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, regs); + + 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 -1; + } + + /* 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 struct serio * __init q40kbd_allocate_port(void) +{ + struct serio *serio; + + serio = kmalloc(sizeof(struct serio), GFP_KERNEL); + if (serio) { + memset(serio, 0, sizeof(struct serio)); + serio->id.type = SERIO_8042; + serio->open = q40kbd_open; + serio->close = q40kbd_close; + serio->dev.parent = &q40kbd_device->dev; + strlcpy(serio->name, "Q40 Kbd Port", sizeof(serio->name)); + strlcpy(serio->phys, "Q40", sizeof(serio->phys)); + } + + return serio; +} + +static int __init q40kbd_init(void) +{ + if (!MACH_IS_Q40) + return -EIO; + + q40kbd_device = platform_device_register_simple("q40kbd", -1, NULL, 0); + if (IS_ERR(q40kbd_device)) + return PTR_ERR(q40kbd_device); + + if (!(q40kbd_port = q40kbd_allocate_port())) { + platform_device_unregister(q40kbd_device); + return -ENOMEM; + } + + serio_register_port(q40kbd_port); + printk(KERN_INFO "serio: Q40 kbd registered\n"); + + return 0; +} + +static void __exit q40kbd_exit(void) +{ + serio_unregister_port(q40kbd_port); + platform_device_unregister(q40kbd_device); +} + +module_init(q40kbd_init); +module_exit(q40kbd_exit); |