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 <mach/hardware.h>
  40#include <asm/hardware/iomd.h>
  41
  42MODULE_AUTHOR("Vojtech Pavlik, Russell King");
  43MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
  44MODULE_LICENSE("GPL");
  45MODULE_ALIAS("platform:kart");
  46
  47struct rpckbd_data {
  48        int tx_irq;
  49        int rx_irq;
  50};
  51
  52static int rpckbd_write(struct serio *port, unsigned char val)
  53{
  54        while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
  55                cpu_relax();
  56
  57        iomd_writeb(val, IOMD_KARTTX);
  58
  59        return 0;
  60}
  61
  62static irqreturn_t rpckbd_rx(int irq, void *dev_id)
  63{
  64        struct serio *port = dev_id;
  65        unsigned int byte;
  66        int handled = IRQ_NONE;
  67
  68        while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
  69                byte = iomd_readb(IOMD_KARTRX);
  70
  71                serio_interrupt(port, byte, 0);
  72                handled = IRQ_HANDLED;
  73        }
  74        return handled;
  75}
  76
  77static irqreturn_t rpckbd_tx(int irq, void *dev_id)
  78{
  79        return IRQ_HANDLED;
  80}
  81
  82static int rpckbd_open(struct serio *port)
  83{
  84        struct rpckbd_data *rpckbd = port->port_data;
  85
  86        /* Reset the keyboard state machine. */
  87        iomd_writeb(0, IOMD_KCTRL);
  88        iomd_writeb(8, IOMD_KCTRL);
  89        iomd_readb(IOMD_KARTRX);
  90
  91        if (request_irq(rpckbd->rx_irq, rpckbd_rx, 0, "rpckbd", port) != 0) {
  92                printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
  93                return -EBUSY;
  94        }
  95
  96        if (request_irq(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) {
  97                printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
  98                free_irq(rpckbd->rx_irq, port);
  99                return -EBUSY;
 100        }
 101
 102        return 0;
 103}
 104
 105static void rpckbd_close(struct serio *port)
 106{
 107        struct rpckbd_data *rpckbd = port->port_data;
 108
 109        free_irq(rpckbd->rx_irq, port);
 110        free_irq(rpckbd->tx_irq, port);
 111}
 112
 113/*
 114 * Allocate and initialize serio structure for subsequent registration
 115 * with serio core.
 116 */
 117static int rpckbd_probe(struct platform_device *dev)
 118{
 119        struct rpckbd_data *rpckbd;
 120        struct serio *serio;
 121        int tx_irq, rx_irq;
 122
 123        rx_irq = platform_get_irq(dev, 0);
 124        if (rx_irq <= 0)
 125                return rx_irq < 0 ? rx_irq : -ENXIO;
 126
 127        tx_irq = platform_get_irq(dev, 1);
 128        if (tx_irq <= 0)
 129                return tx_irq < 0 ? tx_irq : -ENXIO;
 130
 131        serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
 132        rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL);
 133        if (!serio || !rpckbd) {
 134                kfree(rpckbd);
 135                kfree(serio);
 136                return -ENOMEM;
 137        }
 138
 139        rpckbd->rx_irq = rx_irq;
 140        rpckbd->tx_irq = tx_irq;
 141
 142        serio->id.type          = SERIO_8042;
 143        serio->write            = rpckbd_write;
 144        serio->open             = rpckbd_open;
 145        serio->close            = rpckbd_close;
 146        serio->dev.parent       = &dev->dev;
 147        serio->port_data        = rpckbd;
 148        strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
 149        strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
 150
 151        platform_set_drvdata(dev, serio);
 152        serio_register_port(serio);
 153        return 0;
 154}
 155
 156static int rpckbd_remove(struct platform_device *dev)
 157{
 158        struct serio *serio = platform_get_drvdata(dev);
 159        struct rpckbd_data *rpckbd = serio->port_data;
 160
 161        serio_unregister_port(serio);
 162        kfree(rpckbd);
 163
 164        return 0;
 165}
 166
 167static struct platform_driver rpckbd_driver = {
 168        .probe          = rpckbd_probe,
 169        .remove         = rpckbd_remove,
 170        .driver         = {
 171                .name   = "kart",
 172                .owner  = THIS_MODULE,
 173        },
 174};
 175module_platform_driver(rpckbd_driver);
 176