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#include <linux/slab.h>
  38
  39#include <asm/irq.h>
  40#include <mach/hardware.h>
  41#include <asm/hardware/iomd.h>
  42#include <asm/system.h>
  43
  44MODULE_AUTHOR("Vojtech Pavlik, Russell King");
  45MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
  46MODULE_LICENSE("GPL");
  47MODULE_ALIAS("platform:kart");
  48
  49static int rpckbd_write(struct serio *port, unsigned char val)
  50{
  51        while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
  52                cpu_relax();
  53
  54        iomd_writeb(val, IOMD_KARTTX);
  55
  56        return 0;
  57}
  58
  59static irqreturn_t rpckbd_rx(int irq, void *dev_id)
  60{
  61        struct serio *port = dev_id;
  62        unsigned int byte;
  63        int handled = IRQ_NONE;
  64
  65        while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
  66                byte = iomd_readb(IOMD_KARTRX);
  67
  68                serio_interrupt(port, byte, 0);
  69                handled = IRQ_HANDLED;
  70        }
  71        return handled;
  72}
  73
  74static irqreturn_t rpckbd_tx(int irq, void *dev_id)
  75{
  76        return IRQ_HANDLED;
  77}
  78
  79static int rpckbd_open(struct serio *port)
  80{
  81        /* Reset the keyboard state machine. */
  82        iomd_writeb(0, IOMD_KCTRL);
  83        iomd_writeb(8, IOMD_KCTRL);
  84        iomd_readb(IOMD_KARTRX);
  85
  86        if (request_irq(IRQ_KEYBOARDRX, rpckbd_rx, 0, "rpckbd", port) != 0) {
  87                printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
  88                return -EBUSY;
  89        }
  90
  91        if (request_irq(IRQ_KEYBOARDTX, rpckbd_tx, 0, "rpckbd", port) != 0) {
  92                printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
  93                free_irq(IRQ_KEYBOARDRX, port);
  94                return -EBUSY;
  95        }
  96
  97        return 0;
  98}
  99
 100static void rpckbd_close(struct serio *port)
 101{
 102        free_irq(IRQ_KEYBOARDRX, port);
 103        free_irq(IRQ_KEYBOARDTX, port);
 104}
 105
 106/*
 107 * Allocate and initialize serio structure for subsequent registration
 108 * with serio core.
 109 */
 110static int __devinit rpckbd_probe(struct platform_device *dev)
 111{
 112        struct serio *serio;
 113
 114        serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
 115        if (!serio)
 116                return -ENOMEM;
 117
 118        serio->id.type          = SERIO_8042;
 119        serio->write            = rpckbd_write;
 120        serio->open             = rpckbd_open;
 121        serio->close            = rpckbd_close;
 122        serio->dev.parent       = &dev->dev;
 123        strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
 124        strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
 125
 126        platform_set_drvdata(dev, serio);
 127        serio_register_port(serio);
 128        return 0;
 129}
 130
 131static int __devexit rpckbd_remove(struct platform_device *dev)
 132{
 133        struct serio *serio = platform_get_drvdata(dev);
 134        serio_unregister_port(serio);
 135        return 0;
 136}
 137
 138static struct platform_driver rpckbd_driver = {
 139        .probe          = rpckbd_probe,
 140        .remove         = __devexit_p(rpckbd_remove),
 141        .driver         = {
 142                .name   = "kart",
 143                .owner  = THIS_MODULE,
 144        },
 145};
 146
 147static int __init rpckbd_init(void)
 148{
 149        return platform_driver_register(&rpckbd_driver);
 150}
 151
 152static void __exit rpckbd_exit(void)
 153{
 154        platform_driver_unregister(&rpckbd_driver);
 155}
 156
 157module_init(rpckbd_init);
 158module_exit(rpckbd_exit);
 159