LXR linux/drivers/input/serio/rpckbd.c

   1/*
   2 *  Copyright (c) 2000-2001 Vojtech Pavlik
   3 *  Copyright (c) 2002 Russell King
   4 */
   5
   6/*
   7 * Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM
   8 */
   9
  10/*
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License as published by
  13 * the Free Software Foundation; either version 2 of the License, or
  14 * (at your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public License
  22 * along with this program; if not, write to the Free Software
  23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24 *
  25 * Should you need to contact me, the author, you can do so either by
  26 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  27 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  28 */
  29
  30#include <linux/module.h>
  31#include <linux/interrupt.h>
  32#include <linux/init.h>
  33#include <linux/serio.h>
  34#include <linux/err.h>
  35#include <linux/platform_device.h>
  36#include <linux/io.h>
  37
  38#include <asm/irq.h>
  39#include <mach/hardware.h>
  40#include <asm/hardware/iomd.h>
  41#include <asm/system.h>
  42
  43MODULE_AUTHOR("Vojtech Pavlik, Russell King");
  44MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
  45MODULE_LICENSE("GPL");
  46MODULE_ALIAS("platform:kart");
  47
  48static int rpckbd_write(struct serio *port, unsigned char val)
  49{
  50        while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
  51                cpu_relax();
  52
  53        iomd_writeb(val, IOMD_KARTTX);
  54
  55        return 0;
  56}
  57
  58static irqreturn_t rpckbd_rx(int irq, void *dev_id)
  59{
  60        struct serio *port = dev_id;
  61        unsigned int byte;
  62        int handled = IRQ_NONE;
  63
  64        while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
  65                byte = iomd_readb(IOMD_KARTRX);
  66
  67                serio_interrupt(port, byte, 0);
  68                handled = IRQ_HANDLED;
  69        }
  70        return handled;
  71}
  72
  73static irqreturn_t rpckbd_tx(int irq, void *dev_id)
  74{
  75        return IRQ_HANDLED;
  76}
  77
  78static int rpckbd_open(struct serio *port)
  79{
  80        /* Reset the keyboard state machine. */
  81        iomd_writeb(0, IOMD_KCTRL);
  82        iomd_writeb(8, IOMD_KCTRL);
  83        iomd_readb(IOMD_KARTRX);
  84
  85        if (request_irq(IRQ_KEYBOARDRX, rpckbd_rx, 0, "rpckbd", port) != 0) {
  86                printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
  87                return -EBUSY;
  88        }
  89
  90        if (request_irq(IRQ_KEYBOARDTX, rpckbd_tx, 0, "rpckbd", port) != 0) {
  91                printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
  92                free_irq(IRQ_KEYBOARDRX, NULL);
  93                return -EBUSY;
  94        }
  95
  96        return 0;
  97}
  98
  99static void rpckbd_close(struct serio *port)
 100{
 101        free_irq(IRQ_KEYBOARDRX, port);
 102        free_irq(IRQ_KEYBOARDTX, port);
 103}
 104
 105/*
 106 * Allocate and initialize serio structure for subsequent registration
 107 * with serio core.
 108 */
 109static int __devinit rpckbd_probe(struct platform_device *dev)
 110{
 111        struct serio *serio;
 112
 113        serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
 114        if (!serio)
 115                return -ENOMEM;
 116
 117        serio->id.type          = SERIO_8042;
 118        serio->write            = rpckbd_write;
 119        serio->open             = rpckbd_open;
 120        serio->close            = rpckbd_close;
 121        serio->dev.parent       = &dev->dev;
 122        strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
 123        strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
 124
 125        platform_set_drvdata(dev, serio);
 126        serio_register_port(serio);
 127        return 0;
 128}
 129
 130static int __devexit rpckbd_remove(struct platform_device *dev)
 131{
 132        struct serio *serio = platform_get_drvdata(dev);
 133        serio_unregister_port(serio);
 134        return 0;
 135}
 136
 137static struct platform_driver rpckbd_driver = {
 138        .probe          = rpckbd_probe,
 139        .remove         = __devexit_p(rpckbd_remove),
 140        .driver         = {
 141                .name   = "kart",
 142                .owner  = THIS_MODULE,
 143        },
 144};
 145
 146static int __init rpckbd_init(void)
 147{
 148        return platform_driver_register(&rpckbd_driver);
 149}
 150
 151static void __exit rpckbd_exit(void)
 152{
 153        platform_driver_unregister(&rpckbd_driver);
 154}
 155
 156module_init(rpckbd_init);
 157module_exit(rpckbd_exit);
 158