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/serio.h>
  33 #include <linux/err.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/io.h>
  36 #include <linux/slab.h>
  37
  38 #include <mach/hardware.h>
  39 #include <asm/hardware/iomd.h>
  40
  41 MODULE_AUTHOR("Vojtech Pavlik, Russell King");
  42 MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver");
  43 MODULE_LICENSE("GPL");
  44 MODULE_ALIAS("platform:kart");
  45
  46 struct rpckbd_data {
  47         int tx_irq;
  48         int rx_irq;
  49 };
  50
  51 static int rpckbd_write(struct serio *port, unsigned char val)
  52 {
  53         while (!(iomd_readb(IOMD_KCTRL) & (1 << 7)))
  54                 cpu_relax();
  55
  56         iomd_writeb(val, IOMD_KARTTX);
  57
  58         return 0;
  59 }
  60
  61 static irqreturn_t rpckbd_rx(int irq, void *dev_id)
  62 {
  63         struct serio *port = dev_id;
  64         unsigned int byte;
  65         int handled = IRQ_NONE;
  66
  67         while (iomd_readb(IOMD_KCTRL) & (1 << 5)) {
  68                 byte = iomd_readb(IOMD_KARTRX);
  69
  70                 serio_interrupt(port, byte, 0);
  71                 handled = IRQ_HANDLED;
  72         }
  73         return handled;
  74 }
  75
  76 static irqreturn_t rpckbd_tx(int irq, void *dev_id)
  77 {
  78         return IRQ_HANDLED;
  79 }
  80
  81 static int rpckbd_open(struct serio *port)
  82 {
  83         struct rpckbd_data *rpckbd = port->port_data;
  84
  85         /* Reset the keyboard state machine. */
  86         iomd_writeb(0, IOMD_KCTRL);
  87         iomd_writeb(8, IOMD_KCTRL);
  88         iomd_readb(IOMD_KARTRX);
  89
  90         if (request_irq(rpckbd->rx_irq, rpckbd_rx, 0, "rpckbd", port) != 0) {
  91                 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n");
  92                 return -EBUSY;
  93         }
  94
  95         if (request_irq(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) {
  96                 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n");
  97                 free_irq(rpckbd->rx_irq, port);
  98                 return -EBUSY;
  99         }
 100
 101         return 0;
 102 }
 103
 104 static void rpckbd_close(struct serio *port)
 105 {
 106         struct rpckbd_data *rpckbd = port->port_data;
 107
 108         free_irq(rpckbd->rx_irq, port);
 109         free_irq(rpckbd->tx_irq, port);
 110 }
 111
 112 /*
 113  * Allocate and initialize serio structure for subsequent registration
 114  * with serio core.
 115  */
 116 static int rpckbd_probe(struct platform_device *dev)
 117 {
 118         struct rpckbd_data *rpckbd;
 119         struct serio *serio;
 120         int tx_irq, rx_irq;
 121
 122         rx_irq = platform_get_irq(dev, 0);
 123         if (rx_irq <= 0)
 124                 return rx_irq < 0 ? rx_irq : -ENXIO;
 125
 126         tx_irq = platform_get_irq(dev, 1);
 127         if (tx_irq <= 0)
 128                 return tx_irq < 0 ? tx_irq : -ENXIO;
 129
 130         serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
 131         rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL);
 132         if (!serio || !rpckbd) {
 133                 kfree(rpckbd);
 134                 kfree(serio);
 135                 return -ENOMEM;
 136         }
 137
 138         rpckbd->rx_irq = rx_irq;
 139         rpckbd->tx_irq = tx_irq;
 140
 141         serio->id.type          = SERIO_8042;
 142         serio->write            = rpckbd_write;
 143         serio->open             = rpckbd_open;
 144         serio->close            = rpckbd_close;
 145         serio->dev.parent       = &dev->dev;
 146         serio->port_data        = rpckbd;
 147         strlcpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name));
 148         strlcpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys));
 149
 150         platform_set_drvdata(dev, serio);
 151         serio_register_port(serio);
 152         return 0;
 153 }
 154
 155 static int rpckbd_remove(struct platform_device *dev)
 156 {
 157         struct serio *serio = platform_get_drvdata(dev);
 158         struct rpckbd_data *rpckbd = serio->port_data;
 159
 160         serio_unregister_port(serio);
 161         kfree(rpckbd);
 162
 163         return 0;
 164 }
 165
 166 static struct platform_driver rpckbd_driver = {
 167         .probe          = rpckbd_probe,
 168         .remove         = rpckbd_remove,
 169         .driver         = {
 170                 .name   = "kart",
 171         },
 172 };
 173 module_platform_driver(rpckbd_driver);