kernel/drivers/input/joystick/joydump.c

   1 /*
   2  *  Copyright (c) 1996-2001 Vojtech Pavlik
   3  */
   4
   5 /*
   6  * This is just a very simple driver that can dump the data
   7  * out of the joystick port into the syslog ...
   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/gameport.h>
  32 #include <linux/kernel.h>
  33 #include <linux/delay.h>
  34 #include <linux/slab.h>
  35
  36 #define DRIVER_DESC     "Gameport data dumper module"
  37
  38 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  39 MODULE_DESCRIPTION(DRIVER_DESC);
  40 MODULE_LICENSE("GPL");
  41
  42 #define BUF_SIZE 256
  43
  44 struct joydump {
  45         unsigned int time;
  46         unsigned char data;
  47 };
  48
  49 static int joydump_connect(struct gameport *gameport, struct gameport_driver *drv)
  50 {
  51         struct joydump *buf;    /* all entries */
  52         struct joydump *dump, *prev;    /* one entry each */
  53         int axes[4], buttons;
  54         int i, j, t, timeout;
  55         unsigned long flags;
  56         unsigned char u;
  57
  58         printk(KERN_INFO "joydump: ,------------------ START ----------------.\n");
  59         printk(KERN_INFO "joydump: | Dumping: %30s |\n", gameport->phys);
  60         printk(KERN_INFO "joydump: | Speed: %28d kHz |\n", gameport->speed);
  61
  62         if (gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {
  63
  64                 printk(KERN_INFO "joydump: | Raw mode not available - trying cooked.    |\n");
  65
  66                 if (gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {
  67
  68                         printk(KERN_INFO "joydump: | Cooked not available either. Failing.   |\n");
  69                         printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
  70                         return -ENODEV;
  71                 }
  72
  73                 gameport_cooked_read(gameport, axes, &buttons);
  74
  75                 for (i = 0; i < 4; i++)
  76                         printk(KERN_INFO "joydump: | Axis %d: %4d.                           |\n", i, axes[i]);
  77                 printk(KERN_INFO "joydump: | Buttons %02x.                             |\n", buttons);
  78                 printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
  79         }
  80
  81         timeout = gameport_time(gameport, 10000); /* 10 ms */
  82
  83         buf = kmalloc(BUF_SIZE * sizeof(struct joydump), GFP_KERNEL);
  84         if (!buf) {
  85                 printk(KERN_INFO "joydump: no memory for testing\n");
  86                 goto jd_end;
  87         }
  88         dump = buf;
  89         t = 0;
  90         i = 1;
  91
  92         local_irq_save(flags);
  93
  94         u = gameport_read(gameport);
  95
  96         dump->data = u;
  97         dump->time = t;
  98         dump++;
  99
 100         gameport_trigger(gameport);
 101
 102         while (i < BUF_SIZE && t < timeout) {
 103
 104                 dump->data = gameport_read(gameport);
 105
 106                 if (dump->data ^ u) {
 107                         u = dump->data;
 108                         dump->time = t;
 109                         i++;
 110                         dump++;
 111                 }
 112                 t++;
 113         }
 114
 115         local_irq_restore(flags);
 116
 117 /*
 118  * Dump data.
 119  */
 120
 121         t = i;
 122         dump = buf;
 123         prev = dump;
 124
 125         printk(KERN_INFO "joydump: >------------------ DATA -----------------<\n");
 126         printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ", 0, 0);
 127         for (j = 7; j >= 0; j--)
 128                 printk("%d", (dump->data >> j) & 1);
 129         printk(" |\n");
 130         dump++;
 131
 132         for (i = 1; i < t; i++, dump++, prev++) {
 133                 printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ",
 134                         i, dump->time - prev->time);
 135                 for (j = 7; j >= 0; j--)
 136                         printk("%d", (dump->data >> j) & 1);
 137                 printk(" |\n");
 138         }
 139         kfree(buf);
 140
 141 jd_end:
 142         printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
 143
 144         return 0;
 145 }
 146
 147 static void joydump_disconnect(struct gameport *gameport)
 148 {
 149         gameport_close(gameport);
 150 }
 151
 152 static struct gameport_driver joydump_drv = {
 153         .driver         = {
 154                 .name   = "joydump",
 155         },
 156         .description    = DRIVER_DESC,
 157         .connect        = joydump_connect,
 158         .disconnect     = joydump_disconnect,
 159 };
 160
 161 module_gameport_driver(joydump_drv);