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
  26 #include <linux/module.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/serio.h>
  29 #include <linux/err.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/io.h>
  32 #include <linux/slab.h>
  33
  34 #include <mach/hardware.h>
  35 #include <asm/hardware/iomd.h>
  36
  37 MODULE_AUTHOR("Vojtech Pavlik, Russell King");
  38 MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
  39 MODULE_LICENSE("GPL");
  40 MODULE_ALIAS("platform:kart");
  41
  42 struct rpckbd_data {
  43         int tx_irq;
  44         int rx_irq;
  45 };
  46
  47 static int rpckbd_write(struct serio *port, unsigned char val)
  48 {
  49         while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
  50                 cpu_relax();
  51
  52         iomd_writeb(val, IOMD_KARTTX);
  53
  54         return 0;
  55 }
  56
  57 static irqreturn_t rpckbd_rx(int irq, void *dev_id)
  58 {
  59         struct serio *port = dev_id;
  60         unsigned int byte;
  61         int handled = IRQ_NONE;
  62
  63         while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
  64                 byte = iomd_readb(IOMD_KARTRX);
  65
  66                 serio_interrupt(port, byte, 0);
  67                 handled = IRQ_HANDLED;
  68         }
  69         return handled;
  70 }
  71
  72 static irqreturn_t rpckbd_tx(int irq, void *dev_id)
  73 {
  74         return IRQ_HANDLED;
  75 }
  76
  77 static int rpckbd_open(struct serio *port)
  78 {
  79         struct rpckbd_data *rpckbd = port->port_data;
  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(rpckbd->rx_irq, 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(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) {
  92                 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
  93                 free_irq(rpckbd->rx_irq, port);
  94                 return -EBUSY;
  95         }
  96
  97         return 0;
  98 }
  99
 100 static void rpckbd_close(struct serio *port)
 101 {
 102         struct rpckbd_data *rpckbd = port->port_data;
 103
 104         free_irq(rpckbd->rx_irq, port);
 105         free_irq(rpckbd->tx_irq, port);
 106 }
 107
 108 /*
 109  * Allocate and initialize serio structure for subsequent registration
 110  * with serio core.
 111  */
 112 static int rpckbd_probe(struct platform_device *dev)
 113 {
 114         struct rpckbd_data *rpckbd;
 115         struct serio *serio;
 116         int tx_irq, rx_irq;
 117
 118         rx_irq = platform_get_irq(dev, 0);
 119         if (rx_irq <= 0)
 120                 return rx_irq < 0 ? rx_irq : -ENXIO;
 121
 122         tx_irq = platform_get_irq(dev, 1);
 123         if (tx_irq <= 0)
 124                 return tx_irq < 0 ? tx_irq : -ENXIO;
 125
 126         serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
 127         rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL);
 128         if (!serio || !rpckbd) {
 129                 kfree(rpckbd);
 130                 kfree(serio);
 131                 return -ENOMEM;
 132         }
 133
 134         rpckbd->rx_irq = rx_irq;
 135         rpckbd->tx_irq = tx_irq;
 136
 137         serio->id.type          = SERIO_8042;
 138         serio->write            = rpckbd_write;
 139         serio->open             = rpckbd_open;
 140         serio->close            = rpckbd_close;
 141         serio->dev.parent       = &dev->dev;
 142         serio->port_data        = rpckbd;
 143         strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
 144         strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
 145
 146         platform_set_drvdata(dev, serio);
 147         serio_register_port(serio);
 148         return 0;
 149 }
 150
 151 static int rpckbd_remove(struct platform_device *dev)
 152 {
 153         struct serio *serio = platform_get_drvdata(dev);
 154         struct rpckbd_data *rpckbd = serio->port_data;
 155
 156         serio_unregister_port(serio);
 157         kfree(rpckbd);
 158
 159         return 0;
 160 }
 161
 162 static struct platform_driver rpckbd_driver = {
 163         .probe          = rpckbd_probe,
 164         .remove         = rpckbd_remove,
 165         .driver         = {
 166                 .name   = "kart",
 167         },
 168 };
 169 module_platform_driver(rpckbd_driver);