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/init.h>
  34 #include <linux/serio.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/err.h>
  37 #include <linux/bitops.h>
  38 #include <linux/platform_device.h>
  39 #include <linux/slab.h>
  40
  41 #include <asm/io.h>
  42 #include <asm/uaccess.h>
  43 #include <asm/q40_master.h>
  44 #include <asm/irq.h>
  45 #include <asm/q40ints.h>
  46
  47 #define DRV_NAME        "q40kbd"
  48
  49 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  50 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
  51 MODULE_LICENSE("GPL");
  52 MODULE_ALIAS("platform:" DRV_NAME);
  53
  54 struct q40kbd {
  55         struct serio *port;
  56         spinlock_t lock;
  57 };
  58
  59 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id)
  60 {
  61         struct q40kbd *q40kbd = dev_id;
  62         unsigned long flags;
  63
  64         spin_lock_irqsave(&q40kbd->lock, flags);
  65
  66         if (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG))
  67                 serio_interrupt(q40kbd->port, master_inb(KEYCODE_REG), 0);
  68
  69         master_outb(-1, KEYBOARD_UNLOCK_REG);
  70
  71         spin_unlock_irqrestore(&q40kbd->lock, flags);
  72
  73         return IRQ_HANDLED;
  74 }
  75
  76 /*
  77  * q40kbd_flush() flushes all data that may be in the keyboard buffers
  78  */
  79
  80 static void q40kbd_flush(struct q40kbd *q40kbd)
  81 {
  82         int maxread = 100;
  83         unsigned long flags;
  84
  85         spin_lock_irqsave(&q40kbd->lock, flags);
  86
  87         while (maxread-- && (Q40_IRQ_KEYB_MASK & master_inb(INTERRUPT_REG)))
  88                 master_inb(KEYCODE_REG);
  89
  90         spin_unlock_irqrestore(&q40kbd->lock, flags);
  91 }
  92
  93 static void q40kbd_stop(void)
  94 {
  95         master_outb(0, KEY_IRQ_ENABLE_REG);
  96         master_outb(-1, KEYBOARD_UNLOCK_REG);
  97 }
  98
  99 /*
 100  * q40kbd_open() is called when a port is open by the higher layer.
 101  * It allocates the interrupt and enables in in the chip.
 102  */
 103
 104 static int q40kbd_open(struct serio *port)
 105 {
 106         struct q40kbd *q40kbd = port->port_data;
 107
 108         q40kbd_flush(q40kbd);
 109
 110         /* off we go */
 111         master_outb(-1, KEYBOARD_UNLOCK_REG);
 112         master_outb(1, KEY_IRQ_ENABLE_REG);
 113
 114         return 0;
 115 }
 116
 117 static void q40kbd_close(struct serio *port)
 118 {
 119         struct q40kbd *q40kbd = port->port_data;
 120
 121         q40kbd_stop();
 122         q40kbd_flush(q40kbd);
 123 }
 124
 125 static int __devinit q40kbd_probe(struct platform_device *pdev)
 126 {
 127         struct q40kbd *q40kbd;
 128         struct serio *port;
 129         int error;
 130
 131         q40kbd = kzalloc(sizeof(struct q40kbd), GFP_KERNEL);
 132         port = kzalloc(sizeof(struct serio), GFP_KERNEL);
 133         if (!q40kbd || !port) {
 134                 error = -ENOMEM;
 135                 goto err_free_mem;
 136         }
 137
 138         q40kbd->port = port;
 139         spin_lock_init(&q40kbd->lock);
 140
 141         port->id.type = SERIO_8042;
 142         port->open = q40kbd_open;
 143         port->close = q40kbd_close;
 144         port->port_data = q40kbd;
 145         port->dev.parent = &pdev->dev;
 146         strlcpy(port->name, "Q40 Kbd Port", sizeof(port->name));
 147         strlcpy(port->phys, "Q40", sizeof(port->phys));
 148
 149         q40kbd_stop();
 150
 151         error = request_irq(Q40_IRQ_KEYBOARD, q40kbd_interrupt, 0,
 152                             DRV_NAME, q40kbd);
 153         if (error) {
 154                 dev_err(&pdev->dev, "Can't get irq %d.\n", Q40_IRQ_KEYBOARD);
 155                 goto err_free_mem;
 156         }
 157
 158         serio_register_port(q40kbd->port);
 159
 160         platform_set_drvdata(pdev, q40kbd);
 161         printk(KERN_INFO "serio: Q40 kbd registered\n");
 162
 163         return 0;
 164
 165 err_free_mem:
 166         kfree(port);
 167         kfree(q40kbd);
 168         return error;
 169 }
 170
 171 static int __devexit q40kbd_remove(struct platform_device *pdev)
 172 {
 173         struct q40kbd *q40kbd = platform_get_drvdata(pdev);
 174
 175         /*
 176          * q40kbd_close() will be called as part of unregistering
 177          * and will ensure that IRQ is turned off, so it is safe
 178          * to unregister port first and free IRQ later.
 179          */
 180         serio_unregister_port(q40kbd->port);
 181         free_irq(Q40_IRQ_KEYBOARD, q40kbd);
 182         kfree(q40kbd);
 183
 184         platform_set_drvdata(pdev, NULL);
 185         return 0;
 186 }
 187
 188 static struct platform_driver q40kbd_driver = {
 189         .driver         = {
 190                 .name   = "q40kbd",
 191                 .owner  = THIS_MODULE,
 192         },
 193         .remove         = __devexit_p(q40kbd_remove),
 194 };
 195
 196 static int __init q40kbd_init(void)
 197 {
 198         return platform_driver_probe(&q40kbd_driver, q40kbd_probe);
 199 }
 200
 201 static void __exit q40kbd_exit(void)
 202 {
 203         platform_driver_unregister(&q40kbd_driver);
 204 }
 205
 206 module_init(q40kbd_init);
 207 module_exit(q40kbd_exit);