drivers/input/serio/rpckbd.c

   1 /*
   2  * $Id: rpckbd.c,v 1.7 2001/09/25 10:12:07 vojtech Exp $
   3  *
   4  *  Copyright (c) 2000-2001 Vojtech Pavlik
   5  *  Copyright (c) 2002 Russell King
   6  */
   7
   8 /*
   9  * Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM
  10  */
  11
  12 /*
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26  *
  27  * Should you need to contact me, the author, you can do so either by
  28  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
  29  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
  30  */
  31
  32 #include <linux/module.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/init.h>
  35 #include <linux/serio.h>
  36 #include <linux/err.h>
  37
  38 #include <asm/irq.h>
  39 #include <asm/hardware.h>
  40 #include <asm/io.h>
  41 #include <asm/hardware/iomd.h>
  42 #include <asm/system.h>
  43
  44 MODULE_AUTHOR("Vojtech Pavlik, Russell King");
  45 MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
  46 MODULE_LICENSE("GPL");
  47
  48 static 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
  58 static irqreturn_t rpckbd_rx(int irq, void *dev_id, struct pt_regs *regs)
  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, regs);
  68                 handled = IRQ_HANDLED;
  69         }
  70         return handled;
  71 }
  72
  73 static irqreturn_t rpckbd_tx(int irq, void *dev_id, struct pt_regs *regs)
  74 {
  75         return IRQ_HANDLED;
  76 }
  77
  78 static 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
  99 static 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  */
 109 static int __devinit rpckbd_probe(struct device *dev)
 110 {
 111         struct serio *serio;
 112
 113         serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
 114         if (!serio)
 115                 return -ENOMEM;
 116
 117         memset(serio, 0, sizeof(struct serio));
 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;
 123         strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
 124         strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
 125
 126         dev_set_drvdata(dev, serio);
 127         serio_register_port(serio);
 128         return 0;
 129 }
 130
 131 static int __devexit rpckbd_remove(struct device *dev)
 132 {
 133         struct serio *serio = dev_get_drvdata(dev);
 134         serio_unregister_port(serio);
 135         return 0;
 136 }
 137
 138 static struct device_driver rpckbd_driver = {
 139         .name           = "kart",
 140         .bus            = &platform_bus_type,
 141         .probe          = rpckbd_probe,
 142         .remove         = __devexit_p(rpckbd_remove),
 143 };
 144
 145 static int __init rpckbd_init(void)
 146 {
 147         return driver_register(&rpckbd_driver);
 148 }
 149
 150 static void __exit rpckbd_exit(void)
 151 {
 152         driver_unregister(&rpckbd_driver);
 153 }
 154
 155 module_init(rpckbd_init);
 156 module_exit(rpckbd_exit);