Quelle  joydump.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) 1996-2001 Vojtech Pavlik
 */

/*
 * This is just a very simple driver that can dump the data
 * out of the joystick port into the syslog ...
 */

#include <linux/module.h>
#include <linux/gameport.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>

#define DRIVER_DESC "Gameport data dumper module"

MODULE_AUTHOR("Vojtech Pavlik ");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

#define BUF_SIZE 256

struct joydump {
 unsigned int time;
 unsigned char data;
};

static int joydump_connect(struct gameport *gameport, struct gameport_driver *drv)
{
 struct joydump *buf; /* all entries */
 struct joydump *dump, *prev; /* one entry each */
 int axes[4], buttons;
 int i, j, t, timeout;
 unsigned long flags;
 unsigned char u;

 printk(KERN_INFO "joydump: ,------------------ START ----------------.\n");
 printk(KERN_INFO "joydump: | Dumping: %30s |\n", gameport->phys);
 printk(KERN_INFO "joydump: | Speed: %28d kHz |\n", gameport->speed);

 if (gameport_open(gameport, drv, GAMEPORT_MODE_RAW)) {

  printk(KERN_INFO "joydump: | Raw mode not available - trying cooked. |\n");

  if (gameport_open(gameport, drv, GAMEPORT_MODE_COOKED)) {

   printk(KERN_INFO "joydump: | Cooked not available either. Failing. |\n");
   printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
   return -ENODEV;
  }

  gameport_cooked_read(gameport, axes, &buttons);

  for (i = 0; i < 4; i++)
   printk(KERN_INFO "joydump: | Axis %d: %4d. |\n", i, axes[i]);
  printk(KERN_INFO "joydump: | Buttons %02x. |\n", buttons);
  printk(KERN_INFO "joydump: `------------------- END -----------------'\n");
 }

 timeout = gameport_time(gameport, 10000); /* 10 ms */

 buf = kmalloc_array(BUF_SIZE, sizeof(struct joydump), GFP_KERNEL);
 if (!buf) {
  printk(KERN_INFO "joydump: no memory for testing\n");
  goto jd_end;
 }
 dump = buf;
 t = 0;
 i = 1;

 local_irq_save(flags);

 u = gameport_read(gameport);

 dump->data = u;
 dump->time = t;
 dump++;

 gameport_trigger(gameport);

 while (i < BUF_SIZE && t < timeout) {

  dump->data = gameport_read(gameport);

  if (dump->data ^ u) {
   u = dump->data;
   dump->time = t;
   i++;
   dump++;
  }
  t++;
 }

 local_irq_restore(flags);

/*
 * Dump data.
 */

 t = i;
 dump = buf;
 prev = dump;

 printk(KERN_INFO "joydump: >------------------ DATA -----------------<\n");
 printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ", 0, 0);
 for (j = 7; j >= 0; j--)
  printk("%d", (dump->data >> j) & 1);
 printk(" |\n");
 dump++;

 for (i = 1; i < t; i++, dump++, prev++) {
  printk(KERN_INFO "joydump: | index: %3d delta: %3d us data: ",
   i, dump->time - prev->time);
  for (j = 7; j >= 0; j--)
   printk("%d", (dump->data >> j) & 1);
  printk(" |\n");
 }
 kfree(buf);

jd_end:
 printk(KERN_INFO "joydump: `------------------- END -----------------'\n");

 return 0;
}

static void joydump_disconnect(struct gameport *gameport)
{
 gameport_close(gameport);
}

static struct gameport_driver joydump_drv = {
 .driver  = {
  .name = "joydump",
 },
 .description = DRIVER_DESC,
 .connect = joydump_connect,
 .disconnect = joydump_disconnect,
};

module_gameport_driver(joydump_drv);