LXR linux/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
  22MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  23MODULE_DESCRIPTION(DRIVER_DESC);
  24MODULE_LICENSE("GPL");
  25
  26#define BUF_SIZE 256
  27
  28struct joydump {
  29        unsigned int time;
  30        unsigned char data;
  31};
  32
  33static 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
 125jd_end:
 126        printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
 127
 128        return 0;
 129}
 130
 131static void joydump_disconnect(struct gameport *gameport)
 132{
 133        gameport_close(gameport);
 134}
 135
 136static 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
 145module_gameport_driver(joydump_drv);
 146