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
  42 MODULE_AUTHOR("Vojtech Pavlik, Russell King");
  43 MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
  44 MODULE_LICENSE("GPL");
  45 MODULE_ALIAS("platform:kart");
  46
  47 struct rpckbd_data {
  48         int tx_irq;
  49         int rx_irq;
  50 };
  51
  52 static 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
  62 static 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
  77 static irqreturn_t rpckbd_tx(int irq, void *dev_id)
  78 {
  79         return IRQ_HANDLED;
  80 }
  81
  82 static 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
 105 static 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  */
 117 static 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
 156 static 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
 167 static struct platform_driver rpckbd_driver = {
 168         .probe          = rpckbd_probe,
 169         .remove         = rpckbd_remove,
 170         .driver         = {
 171                 .name   = "kart",
 172                 .owner  = THIS_MODULE,
 173         },
 174 };
 175 module_platform_driver(rpckbd_driver);