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
  44 MODULE_AUTHOR("Vojtech Pavlik, Russell King");
  45 MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
  46 MODULE_LICENSE("GPL");
  47 MODULE_ALIAS("platform:kart");
  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)
  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
  74 static irqreturn_t rpckbd_tx(int irq, void *dev_id)
  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 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
 131 static 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
 138 static 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
 147 static int __init rpckbd_init(void)
 148 {
 149         return platform_driver_register(&rpckbd_driver);
 150 }
 151
 152 static void __exit rpckbd_exit(void)
 153 {
 154         platform_driver_unregister(&rpckbd_driver);
 155 }
 156
 157 module_init(rpckbd_init);
 158 module_exit(rpckbd_exit);