drivers/input/serio/q40kbd.c

   1 /*
   2  *  Copyright (c) 2000-2001 Vojtech Pavlik
   3  *
   4  *  Based on the work of:
   5  *      Richard Zidlicky <Richard.Zidlicky@stud.informatik.uni-erlangen.de>
   6  */
   7
   8 /*
   9  * Q40 PS/2 keyboard controller driver for Linux/m68k
  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/serio.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/err.h>
  36 #include <linux/bitops.h>
  37 #include <linux/platform_device.h>
  38 #include <linux/slab.h>
  39
  40 #include <asm/io.h>
  41 #include <linux/uaccess.h>
  42 #include <asm/q40_master.h>
  43 #include <asm/irq.h>
  44 #include <asm/q40ints.h>
  45
  46 #define DRV_NAME        "q40kbd"
  47
  48 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  49 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
  50 MODULE_LICENSE("GPL");
  51 MODULE_ALIAS("platform:" DRV_NAME);
  52
  53 struct q40kbd {
  54         struct serio *port;
  55         spinlock_t lock;
  56 };
  57
  58 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
  59 {
  60         struct q40kbd *q40kbd = dev_id;
  61         unsigned long flags;
  62
  63         spin_lock_irqsave(&q40kbd->lock, flags);
  64
  65         if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
  66                 serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0);
  67
  68         master_outb(-1, KEYBOARD_UNLOCK_REG);
  69
  70         spin_unlock_irqrestore(&q40kbd->lock, flags);
  71
  72         return IRQ_HANDLED;
  73 }
  74
  75 /*
  76  * q40kbd_flush() flushes all data that may be in the keyboard buffers
  77  */
  78
  79 static void q40kbd_flush(struct q40kbd *q40kbd)
  80 {
  81         int maxread = 100;
  82         unsigned long flags;
  83
  84         spin_lock_irqsave(&q40kbd->lock, flags);
  85
  86         while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
  87                 master_inb(KEYCODE_REG);
  88
  89         spin_unlock_irqrestore(&q40kbd->lock, flags);
  90 }
  91
  92 static void q40kbd_stop(void)
  93 {
  94         master_outb(0, KEY_IRQ_ENABLE_REG);
  95         master_outb(-1, KEYBOARD_UNLOCK_REG);
  96 }
  97
  98 /*
  99  * q40kbd_open() is called when a port is open by the higher layer.
 100  * It allocates the interrupt and enables in in the chip.
 101  */
 102
 103 static int q40kbd_open(struct serio *port)
 104 {
 105         struct q40kbd *q40kbd = port->port_data;
 106
 107         q40kbd_flush(q40kbd);
 108
 109         /* off we go */
 110         master_outb(-1, KEYBOARD_UNLOCK_REG);
 111         master_outb(1, KEY_IRQ_ENABLE_REG);
 112
 113         return 0;
 114 }
 115
 116 static void q40kbd_close(struct serio *port)
 117 {
 118         struct q40kbd *q40kbd = port->port_data;
 119
 120         q40kbd_stop();
 121         q40kbd_flush(q40kbd);
 122 }
 123
 124 static int q40kbd_probe(struct platform_device *pdev)
 125 {
 126         struct q40kbd *q40kbd;
 127         struct serio *port;
 128         int error;
 129
 130         q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL);
 131         port = kzalloc(sizeof(struct serio), GFP_KERNEL);
 132         if (!q40kbd || !port) {
 133                 error = -ENOMEM;
 134                 goto err_free_mem;
 135         }
 136
 137         q40kbd->port = port;
 138         spin_lock_init(&q40kbd->lock);
 139
 140         port->id.type = SERIO_8042;
 141         port->open = q40kbd_open;
 142         port->close = q40kbd_close;
 143         port->port_data = q40kbd;
 144         port->dev.parent = &pdev->dev;
 145         strlcpy(port->name, "Q40 Kbd Port", sizeof(port->name));
 146         strlcpy(port->phys, "Q40", sizeof(port->phys));
 147
 148         q40kbd_stop();
 149
 150         error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0,
 151                             DRV_NAME, q40kbd);
 152         if (error) {
 153                 dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
 154                 goto err_free_mem;
 155         }
 156
 157         serio_register_port(q40kbd->port);
 158
 159         platform_set_drvdata(pdev, q40kbd);
 160         printk(KERN_INFO "serio: Q40 kbd registered\n");
 161
 162         return 0;
 163
 164 err_free_mem:
 165         kfree(port);
 166         kfree(q40kbd);
 167         return error;
 168 }
 169
 170 static int q40kbd_remove(struct platform_device *pdev)
 171 {
 172         struct q40kbd *q40kbd = platform_get_drvdata(pdev);
 173
 174         /*
 175          * q40kbd_close() will be called as part of unregistering
 176          * and will ensure that IRQ is turned off, so it is safe
 177          * to unregister port first and free IRQ later.
 178          */
 179         serio_unregister_port(q40kbd->port);
 180         free_irq(Q40_IRQ_KEYBOARD, q40kbd);
 181         kfree(q40kbd);
 182
 183         return 0;
 184 }
 185
 186 static struct platform_driver q40kbd_driver = {
 187         .driver         = {
 188                 .name   = "q40kbd",
 189         },
 190         .remove         = q40kbd_remove,
 191 };
 192
 193 module_platform_driver_probe(q40kbd_driver, q40kbd_probe);