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 /*
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/gameport.h>
  16 #include <linux/kernel.h>
  17 #include <linux/delay.h>
  18 #include <linux/slab.h>
  19
  20 #define DRIVER_DESC     "Gameport data dumper module"
  21
  22 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  23 MODULE_DESCRIPTION(DRIVER_DESC);
  24 MODULE_LICENSE("GPL");
  25
  26 #define BUF_SIZE 256
  27
  28 struct joydump {
  29         unsigned int time;
  30         unsigned char data;
  31 };
  32
  33 static int joydump_connect(struct gameport *gameport, struct gameport_driver *drv)
  34 {
  35         struct joydump *buf;    /* all entries */
  36         struct joydump *dump, *prev;    /* one entry each */
  37         int axes[4], buttons;
  38         int i, j, t, timeout;
  39         unsigned long flags;
  40         unsigned char u;
  41
  42         printk(KERN_INFO "joydump: ,------------------ START ----------------.\n");
  43         printk(KERN_INFO "joydump: | Dumping: %30s |\n", gameport->phys);
  44         printk(KERN_INFO "joydump: | Speed: %28d kHz |\n", gameport->speed);
  45
  46         if (gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {
  47
  48                 printk(KERN_INFO "joydump: | Raw mode not available - trying cooked.    |\n");
  49
  50                 if (gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {
  51
  52                         printk(KERN_INFO "joydump: | Cooked not available either. Failing.   |\n");
  53                         printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
  54                         return -ENODEV;
  55                 }
  56
  57                 gameport_cooked_read(gameport, axes, &buttons);
  58
  59                 for (i = 0; i < 4; i++)
  60                         printk(KERN_INFO "joydump: | Axis %d: %4d.                           |\n", i, axes[i]);
  61                 printk(KERN_INFO "joydump: | Buttons %02x.                             |\n", buttons);
  62                 printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
  63         }
  64
  65         timeout = gameport_time(gameport, 10000); /* 10 ms */
  66
  67         buf = kmalloc_array(BUF_SIZE, sizeof(struct joydump), GFP_KERNEL);
  68         if (!buf) {
  69                 printk(KERN_INFO "joydump: no memory for testing\n");
  70                 goto jd_end;
  71         }
  72         dump = buf;
  73         t = 0;
  74         i = 1;
  75
  76         local_irq_save(flags);
  77
  78         u = gameport_read(gameport);
  79
  80         dump->data = u;
  81         dump->time = t;
  82         dump++;
  83
  84         gameport_trigger(gameport);
  85
  86         while (i < BUF_SIZE && t < timeout) {
  87
  88                 dump->data = gameport_read(gameport);
  89
  90                 if (dump->data ^ u) {
  91                         u = dump->data;
  92                         dump->time = t;
  93                         i++;
  94                         dump++;
  95                 }
  96                 t++;
  97         }
  98
  99         local_irq_restore(flags);
 100
 101 /*
 102  * Dump data.
 103  */
 104
 105         t = i;
 106         dump = buf;
 107         prev = dump;
 108
 109         printk(KERN_INFO "joydump: >------------------ DATA -----------------<\n");
 110         printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ", 0, 0);
 111         for (j = 7; j >= 0; j--)
 112                 printk("%d", (dump->data >> j) & 1);
 113         printk(" |\n");
 114         dump++;
 115
 116         for (i = 1; i < t; i++, dump++, prev++) {
 117                 printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ",
 118                         i, dump->time - prev->time);
 119                 for (j = 7; j >= 0; j--)
 120                         printk("%d", (dump->data >> j) & 1);
 121                 printk(" |\n");
 122         }
 123         kfree(buf);
 124
 125 jd_end:
 126         printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
 127
 128         return 0;
 129 }
 130
 131 static void joydump_disconnect(struct gameport *gameport)
 132 {
 133         gameport_close(gameport);
 134 }
 135
 136 static struct gameport_driver joydump_drv = {
 137         .driver         = {
 138                 .name   = "joydump",
 139         },
 140         .description    = DRIVER_DESC,
 141         .connect        = joydump_connect,
 142         .disconnect     = joydump_disconnect,
 143 };
 144
 145 module_gameport_driver(joydump_drv);