drivers/input/joystick/joydump.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) 1996-2001 Vojtech Pavlik
   4  */
   5
   6 /*
   7  * This is just a very simple driver that can dump the data
   8  * out of the joystick port into the syslog ...
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/gameport.h>
  13 #include <linux/kernel.h>
  14 #include <linux/delay.h>
  15 #include <linux/slab.h>
  16
  17 #define DRIVER_DESC     "Gameport data dumper module"
  18
  19 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  20 MODULE_DESCRIPTION(DRIVER_DESC);
  21 MODULE_LICENSE("GPL");
  22
  23 #define BUF_SIZE 256
  24
  25 struct joydump {
  26         unsigned int time;
  27         unsigned char data;
  28 };
  29
  30 static int joydump_connect(struct gameport *gameport, struct gameport_driver *drv)
  31 {
  32         struct joydump *buf;    /* all entries */
  33         struct joydump *dump, *prev;    /* one entry each */
  34         int axes[4], buttons;
  35         int i, j, t, timeout;
  36         unsigned long flags;
  37         unsigned char u;
  38
  39         printk(KERN_INFO "joydump: ,------------------ START ----------------.\n");
  40         printk(KERN_INFO "joydump: | Dumping: %30s |\n", gameport->phys);
  41         printk(KERN_INFO "joydump: | Speed: %28d kHz |\n", gameport->speed);
  42
  43         if (gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {
  44
  45                 printk(KERN_INFO "joydump: | Raw mode not available - trying cooked.    |\n");
  46
  47                 if (gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {
  48
  49                         printk(KERN_INFO "joydump: | Cooked not available either. Failing.   |\n");
  50                         printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
  51                         return -ENODEV;
  52                 }
  53
  54                 gameport_cooked_read(gameport, axes, &buttons);
  55
  56                 for (i = 0; i < 4; i++)
  57                         printk(KERN_INFO "joydump: | Axis %d: %4d.                           |\n", i, axes[i]);
  58                 printk(KERN_INFO "joydump: | Buttons %02x.                             |\n", buttons);
  59                 printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
  60         }
  61
  62         timeout = gameport_time(gameport, 10000); /* 10 ms */
  63
  64         buf = kmalloc_array(BUF_SIZE, sizeof(struct joydump), GFP_KERNEL);
  65         if (!buf) {
  66                 printk(KERN_INFO "joydump: no memory for testing\n");
  67                 goto jd_end;
  68         }
  69         dump = buf;
  70         t = 0;
  71         i = 1;
  72
  73         local_irq_save(flags);
  74
  75         u = gameport_read(gameport);
  76
  77         dump->data = u;
  78         dump->time = t;
  79         dump++;
  80
  81         gameport_trigger(gameport);
  82
  83         while (i < BUF_SIZE && t < timeout) {
  84
  85                 dump->data = gameport_read(gameport);
  86
  87                 if (dump->data ^ u) {
  88                         u = dump->data;
  89                         dump->time = t;
  90                         i++;
  91                         dump++;
  92                 }
  93                 t++;
  94         }
  95
  96         local_irq_restore(flags);
  97
  98 /*
  99  * Dump data.
 100  */
 101
 102         t = i;
 103         dump = buf;
 104         prev = dump;
 105
 106         printk(KERN_INFO "joydump: >------------------ DATA -----------------<\n");
 107         printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ", 0, 0);
 108         for (j = 7; j >= 0; j--)
 109                 printk("%d", (dump->data >> j) & 1);
 110         printk(" |\n");
 111         dump++;
 112
 113         for (i = 1; i < t; i++, dump++, prev++) {
 114                 printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ",
 115                         i, dump->time - prev->time);
 116                 for (j = 7; j >= 0; j--)
 117                         printk("%d", (dump->data >> j) & 1);
 118                 printk(" |\n");
 119         }
 120         kfree(buf);
 121
 122 jd_end:
 123         printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
 124
 125         return 0;
 126 }
 127
 128 static void joydump_disconnect(struct gameport *gameport)
 129 {
 130         gameport_close(gameport);
 131 }
 132
 133 static struct gameport_driver joydump_drv = {
 134         .driver         = {
 135                 .name   = "joydump",
 136         },
 137         .description    = DRIVER_DESC,
 138         .connect        = joydump_connect,
 139         .disconnect     = joydump_disconnect,
 140 };
 141
 142 module_gameport_driver(joydump_drv);