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 #include <linux/platform_device.h>
  38
  39 #include <asm/irq.h>
  40 #include <asm/hardware.h>
  41 #include <asm/io.h>
  42 #include <asm/hardware/iomd.h>
  43 #include <asm/system.h>
  44
  45 MODULE_AUTHOR("Vojtech Pavlik, Russell King");
  46 MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
  47 MODULE_LICENSE("GPL");
  48
  49 static 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
  59 static irqreturn_t rpckbd_rx(int irq, void *dev_id, struct pt_regs *regs)
  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, regs);
  69                 handled = IRQ_HANDLED;
  70         }
  71         return handled;
  72 }
  73
  74 static irqreturn_t rpckbd_tx(int irq, void *dev_id, struct pt_regs *regs)
  75 {
  76         return IRQ_HANDLED;
  77 }
  78
  79 static 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, NULL);
  94                 return -EBUSY;
  95         }
  96
  97         return 0;
  98 }
  99
 100 static 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  */
 110 static int __devinit rpckbd_probe(struct device *dev)
 111 {
 112         struct serio *serio;
 113
 114         serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
 115         if (!serio)
 116                 return -ENOMEM;
 117
 118         memset(serio, 0, sizeof(struct serio));
 119         serio->id.type          = SERIO_8042;
 120         serio->write            = rpckbd_write;
 121         serio->open             = rpckbd_open;
 122         serio->close            = rpckbd_close;
 123         serio->dev.parent       = dev;
 124         strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
 125         strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
 126
 127         dev_set_drvdata(dev, serio);
 128         serio_register_port(serio);
 129         return 0;
 130 }
 131
 132 static int __devexit rpckbd_remove(struct device *dev)
 133 {
 134         struct serio *serio = dev_get_drvdata(dev);
 135         serio_unregister_port(serio);
 136         return 0;
 137 }
 138
 139 static struct device_driver rpckbd_driver = {
 140         .name           = "kart",
 141         .bus            = &platform_bus_type,
 142         .probe          = rpckbd_probe,
 143         .remove         = __devexit_p(rpckbd_remove),
 144 };
 145
 146 static int __init rpckbd_init(void)
 147 {
 148         return driver_register(&rpckbd_driver);
 149 }
 150
 151 static void __exit rpckbd_exit(void)
 152 {
 153         driver_unregister(&rpckbd_driver);
 154 }
 155
 156 module_init(rpckbd_init);
 157 module_exit(rpckbd_exit);