src/haptic/linux/SDL_syshaptic.c
author Edgar Simo <bobbens@gmail.com>
Thu, 10 Jul 2008 08:38:08 +0000
branchgsoc2008_force_feedback
changeset 2512 ef147ee4896c
parent 2511 f12ae0bae468
child 2513 55fd9103a330
permissions -rw-r--r--
Improved some ioctl handling.
Implemented SDL_MouseIsHaptic and SDL_HapticOpenFromMouse.
More code comments.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 2008 Edgar Simo
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#ifdef SDL_HAPTIC_LINUX
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#include "SDL_haptic.h"
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#include "../SDL_syshaptic.h"
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#include "SDL_joystick.h"
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#include "../../joystick/SDL_sysjoystick.h" /* For the real SDL_Joystick */
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#include "../../joystick/linux/SDL_sysjoystick_c.h" /* For joystick hwdata */ 
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#include <unistd.h> /* close */
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#include <linux/input.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <linux/limits.h>
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#include <string.h>
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#include <errno.h>
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#include <math.h>
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#ifndef M_PI
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#  define M_PI     3.14159265358979323846
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#endif
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#define MAX_HAPTICS  32
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/*
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 * List of available haptic devices.
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 */
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static struct
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{
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   char *fname;
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   SDL_Haptic *haptic;
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} SDL_hapticlist[MAX_HAPTICS];
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/*
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 * Haptic system hardware data.
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 */
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struct haptic_hwdata
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{
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   int fd;
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};
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/*
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 * Haptic system effect data.
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 */
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struct haptic_hweffect
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{
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   struct ff_effect effect; /* The linux kernel effect structure. */
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};
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#define test_bit(nr, addr) \
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   (((1UL << ((nr) & 31)) & (((const unsigned int *) addr)[(nr) >> 5])) != 0)
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#define EV_TEST(ev,f) \
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   if (test_bit((ev), features)) ret |= (f);
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/*
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 * Test whether a device has haptic properties.
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 * Returns available properties or 0 if there are none.
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 */
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static int
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EV_IsHaptic(int fd)
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{
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   unsigned int ret;
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   unsigned long features[1 + FF_MAX/sizeof(unsigned long)];
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   /* Ask device for what it has. */
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   ret = 0;
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   if (ioctl(fd, EVIOCGBIT(EV_FF, sizeof(features)), features) < 0) {
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      SDL_SetError("Unable to get device's haptic abilities: %s", strerror(errno));
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      return -1;
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   }
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   /* Convert supported features to SDL_HAPTIC platform-neutral features. */
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   EV_TEST(FF_CONSTANT,   SDL_HAPTIC_CONSTANT);
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   EV_TEST(FF_PERIODIC,   SDL_HAPTIC_SINE |
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                          SDL_HAPTIC_SQUARE |
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                          SDL_HAPTIC_TRIANGLE |
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                          SDL_HAPTIC_SAWTOOTHUP |
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                          SDL_HAPTIC_SAWTOOTHDOWN);
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   EV_TEST(FF_RAMP,       SDL_HAPTIC_RAMP);
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   EV_TEST(FF_SPRING,     SDL_HAPTIC_SPRING);
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   EV_TEST(FF_FRICTION,   SDL_HAPTIC_FRICTION);
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   EV_TEST(FF_DAMPER,     SDL_HAPTIC_DAMPER);
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   EV_TEST(FF_INERTIA,    SDL_HAPTIC_INERTIA);
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   EV_TEST(FF_CUSTOM,     SDL_HAPTIC_CUSTOM);
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   EV_TEST(FF_GAIN,       SDL_HAPTIC_GAIN);
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   EV_TEST(FF_AUTOCENTER, SDL_HAPTIC_AUTOCENTER);
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   /* Return what it supports. */
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   return ret;
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}
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/*
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 * Tests whether a device is a mouse or not.
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 */
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static int
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EV_IsMouse(int fd)
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{
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   unsigned long argp[40];
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   /* Ask for supported features. */
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   if (ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(argp)), argp) < 0) {
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      return -1;
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   }
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   /* Currently we only test for BTN_MOUSE which can give fake positives. */
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   if (test_bit(BTN_MOUSE,argp) != 0) {
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      return 1;
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   }
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   return 0;
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}
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/*
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 * Initializes the haptic subsystem by finding available devices.
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 */
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int
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SDL_SYS_HapticInit(void)
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{
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   const char joydev_pattern[] = "/dev/input/event%d";
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   dev_t dev_nums[MAX_HAPTICS];
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   char path[PATH_MAX];
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   struct stat sb;
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   int fd;
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   int i, j, k;
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   int duplicate;
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   int numhaptics;
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   numhaptics = 0;
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   /* 
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    * Limit amount of checks to MAX_HAPTICS since we may or may not have
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    * permission to some or all devices.
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    */
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   i = 0;
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   for (j = 0; j < MAX_HAPTICS; ++j) {
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      snprintf(path, PATH_MAX, joydev_pattern, i++);
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      /* check to see if file exists */
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      if (stat(path,&sb) != 0)
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         break;
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      /* check for duplicates */
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      duplicate = 0;
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      for (k = 0; (k < numhaptics) && !duplicate; ++k) {
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         if (sb.st_rdev == dev_nums[k]) {
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            duplicate = 1;
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         }                                                     
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      }                                                         
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      if (duplicate) {
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         continue;
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      }
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      /* try to open */
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      fd = open(path, O_RDWR, 0);
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      if (fd < 0) continue;
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#ifdef DEBUG_INPUT_EVENTS
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      printf("Checking %s\n", path);
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#endif          
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      /* see if it works */
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      if (EV_IsHaptic(fd) > 0) {
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         SDL_hapticlist[numhaptics].fname = SDL_strdup(path);
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         SDL_hapticlist[numhaptics].haptic = NULL;
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         dev_nums[numhaptics] = sb.st_rdev;
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         ++numhaptics;
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      }
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      close(fd);
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   }
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   return numhaptics;
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}
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/*
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 * Return the name of a haptic device, does not need to be opened.
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 */
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const char *
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SDL_SYS_HapticName(int index)
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{
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   int fd;
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   static char namebuf[128];
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   char *name;
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   /* Open the haptic device. */
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   name = NULL;
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   fd = open(SDL_hapticlist[index].fname, O_RDONLY, 0);
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   if (fd >= 0) {
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      /* Check for name ioctl. */
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      if (ioctl(fd, EVIOCGNAME(sizeof(namebuf)), namebuf) <= 0) {
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         /* No name found, return device character device */
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         name = SDL_hapticlist[index].fname;
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      }
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      /* Name found, return name. */
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      else {
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         name = namebuf;
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      }
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   }
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   close(fd);
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   return name;
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}
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/*
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 * Opens the haptic device from the file descriptor.
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 */
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static int
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SDL_SYS_HapticOpenFromFD(SDL_Haptic * haptic, int fd)
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{
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   /* Allocate the hwdata */
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   haptic->hwdata = (struct haptic_hwdata *)
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         SDL_malloc(sizeof(*haptic->hwdata));
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   if (haptic->hwdata == NULL) {
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      SDL_OutOfMemory();
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      goto open_err;
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   }
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   SDL_memset(haptic->hwdata, 0, sizeof(*haptic->hwdata));
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   /* Set the data */
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   haptic->hwdata->fd = fd;
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   haptic->supported = EV_IsHaptic(fd);
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   /* Set the effects */
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   if (ioctl(fd, EVIOCGEFFECTS, &haptic->neffects) < 0) {
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      SDL_SetError("Unable to query haptic device memory: %s", strerror(errno));
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      goto open_err;
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   }
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   haptic->effects = (struct haptic_effect *)
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         SDL_malloc(sizeof(struct haptic_effect) * haptic->neffects);
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   if (haptic->effects == NULL) {
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      SDL_OutOfMemory();
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      goto open_err;
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   }
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   /* Clear the memory */
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   SDL_memset(haptic->effects, 0,
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         sizeof(struct haptic_effect) * haptic->neffects);
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   return 0;
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   /* Error handling */
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open_err:
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   close(fd);
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   if (haptic->hwdata != NULL) {
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      free(haptic->hwdata);
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      haptic->hwdata = NULL;
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   }
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   return -1;
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}
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/*
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 * Opens a haptic device for usage.
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 */
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int
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SDL_SYS_HapticOpen(SDL_Haptic * haptic)
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{
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   int fd;
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   /* Open the character device */
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   fd = open(SDL_hapticlist[haptic->index].fname, O_RDWR, 0);
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   if (fd < 0) {
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      SDL_SetError("Unable to open %s: %s",
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            SDL_hapticlist[haptic->index], strerror(errno));
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      return -1;
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   }
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   return SDL_SYS_HapticOpenFromFD(haptic,fd);
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}
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/*
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 * Opens a haptic device from first mouse it finds for usage.
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 */
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int
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SDL_SYS_HapticMouse(void)
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{
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   int fd;
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   int i;
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   314
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   for (i=0; i<SDL_numhaptics; i++) {
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      /* Open the device. */
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      fd = open(SDL_hapticlist[i].fname, O_RDWR, 0);
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      if (fd < 0) {
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         SDL_SetError("Unable to open %s: %s",
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               SDL_hapticlist[i], strerror(errno));
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         return -1;
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      }
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   324
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      if (EV_IsMouse(fd)) {
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         close(fd);
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         return i;
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   328
      }
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   329
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      close(fd);
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   }
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   return -1;
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   334
}
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   336
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/*
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 * Checks to see if a joystick has haptic features.
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   339
 */
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int
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SDL_SYS_JoystickIsHaptic(SDL_Joystick * joystick)
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   342
{
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   343
   return EV_IsHaptic(joystick->hwdata->fd);
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   344
}
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   345
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   346
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   347
/*
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 * Checks to see if the haptic device and joystick and in reality the same.
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   349
 */
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int
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SDL_SYS_JoystickSameHaptic(SDL_Haptic * haptic, SDL_Joystick * joystick)
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   352
{
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   353
   if (SDL_strcmp(joystick->name,haptic->name)==0) {
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   354
      return 1;
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   355
   }
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   356
   return 0;
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   357
}
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   358
bobbens@2489
   359
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   360
/*
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   361
 * Opens a SDL_Haptic from a SDL_Joystick.
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   362
 */
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   363
int
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   364
SDL_SYS_HapticOpenFromJoystick(SDL_Haptic * haptic, SDL_Joystick * joystick)
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   365
{
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   int fd;
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   367
   fd = open(joystick->hwdata->fname, O_RDWR, 0);
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   368
   return SDL_SYS_HapticOpenFromFD(haptic,fd);
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   369
}
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   370
bobbens@2489
   371
bobbens@2489
   372
/*
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   373
 * Closes the haptic device.
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   374
 */
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   375
void
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   376
SDL_SYS_HapticClose(SDL_Haptic * haptic)
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   377
{
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   378
   if (haptic->hwdata) {
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   379
bobbens@2476
   380
      /* Clean up */
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   381
      close(haptic->hwdata->fd);
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   382
bobbens@2476
   383
      /* Free */
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   384
      SDL_free(haptic->hwdata);
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   385
      haptic->hwdata = NULL;
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   386
      SDL_free(haptic->effects);
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   387
      haptic->neffects = 0;
bobbens@2476
   388
   }
bobbens@2475
   389
}
bobbens@2475
   390
bobbens@2475
   391
bobbens@2477
   392
/* 
bobbens@2477
   393
 * Clean up after system specific haptic stuff
bobbens@2477
   394
 */
bobbens@2474
   395
void
bobbens@2474
   396
SDL_SYS_HapticQuit(void)
bobbens@2474
   397
{
bobbens@2474
   398
   int i;
bobbens@2474
   399
bobbens@2474
   400
   for (i=0; SDL_hapticlist[i].fname != NULL; i++) {
bobbens@2474
   401
      SDL_free(SDL_hapticlist[i].fname);
bobbens@2474
   402
   }
bobbens@2474
   403
   SDL_hapticlist[0].fname = NULL;
bobbens@2474
   404
}
bobbens@2474
   405
bobbens@2500
   406
/*
bobbens@2500
   407
 * Returns the ff_effect usable direction from a SDL_HapticDirection.
bobbens@2500
   408
 */
bobbens@2500
   409
static Uint16
bobbens@2500
   410
SDL_SYS_ToDirection( SDL_HapticDirection * dir )
bobbens@2500
   411
{
bobbens@2500
   412
   Uint32 tmp;
bobbens@2511
   413
   float f; /* Ideally we'd use fixed point math instead of floats... */
bobbens@2500
   414
bobbens@2500
   415
   switch (dir->type) {
bobbens@2500
   416
      case SDL_HAPTIC_POLAR:
bobbens@2502
   417
         /* Linux directions are inverted. */
bobbens@2502
   418
         tmp = (((18000 + dir->dir[0]) % 36000) * 0xFFFF) / 36000;
bobbens@2500
   419
         return (Uint16) tmp;
bobbens@2500
   420
      case SDL_HAPTIC_CARTESIAN:
bobbens@2511
   421
         /* We must invert "x" and "y" to go clockwise. */
bobbens@2510
   422
         f = atan2(dir->dir[0], dir->dir[1]);
bobbens@2510
   423
         tmp = (int)(f*18000./M_PI) % 36000;
bobbens@2510
   424
         tmp = (tmp * 0xFFFF) / 36000;
bobbens@2510
   425
         return (Uint16) tmp;
bobbens@2500
   426
bobbens@2500
   427
      default:
bobbens@2500
   428
         return -1;
bobbens@2500
   429
   }
bobbens@2500
   430
bobbens@2500
   431
   return 0;
bobbens@2500
   432
}
bobbens@2500
   433
bobbens@2481
   434
#define  CLAMP(x)    (((x) > 32767) ? 32767 : x)
bobbens@2477
   435
/*
bobbens@2479
   436
 * Initializes the linux effect struct from a haptic_effect.
bobbens@2481
   437
 * Values above 32767 (for unsigned) are unspecified so we must clamp.
bobbens@2479
   438
 */
bobbens@2479
   439
static int
bobbens@2480
   440
SDL_SYS_ToFFEffect( struct ff_effect * dest, SDL_HapticEffect * src )
bobbens@2479
   441
{
bobbens@2482
   442
   int i;
bobbens@2480
   443
   SDL_HapticConstant *constant;
bobbens@2480
   444
   SDL_HapticPeriodic *periodic;
bobbens@2482
   445
   SDL_HapticCondition *condition;
bobbens@2482
   446
   SDL_HapticRamp *ramp;
bobbens@2480
   447
bobbens@2480
   448
   /* Clear up */
bobbens@2479
   449
   SDL_memset(dest, 0, sizeof(struct ff_effect));
bobbens@2480
   450
bobbens@2480
   451
   switch (src->type) {
bobbens@2479
   452
      case SDL_HAPTIC_CONSTANT:
bobbens@2480
   453
         constant = &src->constant;
bobbens@2480
   454
bobbens@2480
   455
         /* Header */
bobbens@2479
   456
         dest->type = FF_CONSTANT;
bobbens@2500
   457
         dest->direction = SDL_SYS_ToDirection(&constant->direction);
bobbens@2480
   458
bobbens@2480
   459
         /* Replay */
bobbens@2481
   460
         dest->replay.length = CLAMP(constant->length);
bobbens@2481
   461
         dest->replay.delay = CLAMP(constant->delay);
bobbens@2480
   462
bobbens@2480
   463
         /* Trigger */
bobbens@2481
   464
         dest->trigger.button = CLAMP(constant->button);
bobbens@2481
   465
         dest->trigger.interval = CLAMP(constant->interval);
bobbens@2480
   466
bobbens@2480
   467
         /* Constant */
bobbens@2480
   468
         dest->u.constant.level = constant->level;
bobbens@2480
   469
bobbens@2480
   470
         /* Envelope */
bobbens@2481
   471
         dest->u.constant.envelope.attack_length = CLAMP(constant->attack_length);
bobbens@2481
   472
         dest->u.constant.envelope.attack_level = CLAMP(constant->attack_level);
bobbens@2481
   473
         dest->u.constant.envelope.fade_length = CLAMP(constant->fade_length);
bobbens@2481
   474
         dest->u.constant.envelope.fade_level = CLAMP(constant->fade_level);
bobbens@2480
   475
bobbens@2480
   476
         break;
bobbens@2480
   477
bobbens@2487
   478
      case SDL_HAPTIC_SINE:
bobbens@2487
   479
      case SDL_HAPTIC_SQUARE:
bobbens@2487
   480
      case SDL_HAPTIC_TRIANGLE:
bobbens@2487
   481
      case SDL_HAPTIC_SAWTOOTHUP:
bobbens@2487
   482
      case SDL_HAPTIC_SAWTOOTHDOWN:
bobbens@2480
   483
         periodic = &src->periodic;
bobbens@2480
   484
bobbens@2480
   485
         /* Header */
bobbens@2480
   486
         dest->type = FF_PERIODIC;
bobbens@2500
   487
         dest->direction = SDL_SYS_ToDirection(&periodic->direction);
bobbens@2480
   488
         
bobbens@2480
   489
         /* Replay */
bobbens@2481
   490
         dest->replay.length = CLAMP(periodic->length);
bobbens@2481
   491
         dest->replay.delay = CLAMP(periodic->delay);
bobbens@2480
   492
         
bobbens@2480
   493
         /* Trigger */
bobbens@2481
   494
         dest->trigger.button = CLAMP(periodic->button);
bobbens@2481
   495
         dest->trigger.interval = CLAMP(periodic->interval);
bobbens@2480
   496
         
bobbens@2487
   497
         /* Periodic */
bobbens@2487
   498
         if (periodic->type == SDL_HAPTIC_SINE)
bobbens@2487
   499
            dest->u.periodic.waveform = FF_SINE;
bobbens@2487
   500
         else if (periodic->type == SDL_HAPTIC_SQUARE)
bobbens@2487
   501
            dest->u.periodic.waveform = FF_SQUARE;
bobbens@2487
   502
         else if (periodic->type == SDL_HAPTIC_TRIANGLE)       
bobbens@2487
   503
            dest->u.periodic.waveform = FF_TRIANGLE;
bobbens@2487
   504
         else if (periodic->type == SDL_HAPTIC_SAWTOOTHUP)       
bobbens@2487
   505
            dest->u.periodic.waveform = FF_SAW_UP;
bobbens@2487
   506
         else if (periodic->type == SDL_HAPTIC_SAWTOOTHDOWN)       
bobbens@2487
   507
            dest->u.periodic.waveform = FF_SAW_DOWN;
bobbens@2481
   508
         dest->u.periodic.period = CLAMP(periodic->period);
bobbens@2480
   509
         dest->u.periodic.magnitude = periodic->magnitude;
bobbens@2480
   510
         dest->u.periodic.offset = periodic->offset;
bobbens@2481
   511
         dest->u.periodic.phase = CLAMP(periodic->phase);
bobbens@2480
   512
         
bobbens@2480
   513
         /* Envelope */
bobbens@2481
   514
         dest->u.periodic.envelope.attack_length = CLAMP(periodic->attack_length);
bobbens@2481
   515
         dest->u.periodic.envelope.attack_level = CLAMP(periodic->attack_level);
bobbens@2481
   516
         dest->u.periodic.envelope.fade_length = CLAMP(periodic->fade_length);
bobbens@2481
   517
         dest->u.periodic.envelope.fade_level = CLAMP(periodic->fade_level);
bobbens@2479
   518
bobbens@2479
   519
         break;
bobbens@2479
   520
bobbens@2482
   521
      case SDL_HAPTIC_SPRING:
bobbens@2482
   522
      case SDL_HAPTIC_DAMPER:
bobbens@2482
   523
      case SDL_HAPTIC_INERTIA:
bobbens@2482
   524
      case SDL_HAPTIC_FRICTION:
bobbens@2482
   525
         condition = &src->condition;
bobbens@2482
   526
bobbens@2482
   527
         /* Header */
bobbens@2503
   528
         if (condition->type == SDL_HAPTIC_SPRING)
bobbens@2482
   529
            dest->type = FF_SPRING;
bobbens@2503
   530
         else if (condition->type == SDL_HAPTIC_DAMPER)
bobbens@2482
   531
            dest->type = FF_DAMPER;
bobbens@2503
   532
         else if (condition->type == SDL_HAPTIC_INERTIA)
bobbens@2482
   533
            dest->type = FF_INERTIA;
bobbens@2503
   534
         else if (condition->type == SDL_HAPTIC_FRICTION)
bobbens@2482
   535
            dest->type = FF_FRICTION;
bobbens@2500
   536
         dest->direction = 0; /* Handled by the condition-specifics. */
bobbens@2482
   537
bobbens@2482
   538
         /* Replay */
bobbens@2482
   539
         dest->replay.length = CLAMP(condition->length);
bobbens@2482
   540
         dest->replay.delay = CLAMP(condition->delay);
bobbens@2482
   541
bobbens@2482
   542
         /* Trigger */
bobbens@2482
   543
         dest->trigger.button = CLAMP(condition->button);
bobbens@2482
   544
         dest->trigger.interval = CLAMP(condition->interval);
bobbens@2482
   545
bobbens@2500
   546
         /* Condition */
bobbens@2500
   547
         /* X axis */
bobbens@2500
   548
         dest->u.condition[0].right_saturation = CLAMP(condition->right_sat[0]);
bobbens@2500
   549
         dest->u.condition[0].left_saturation = CLAMP(condition->left_sat[0]);
bobbens@2500
   550
         dest->u.condition[0].right_coeff = condition->right_coeff[0];
bobbens@2500
   551
         dest->u.condition[0].left_coeff = condition->left_coeff[0];
bobbens@2500
   552
         dest->u.condition[0].deadband = CLAMP(condition->deadband[0]);
bobbens@2500
   553
         dest->u.condition[0].center = condition->center[0];
bobbens@2500
   554
         /* Y axis */
bobbens@2500
   555
         dest->u.condition[1].right_saturation = CLAMP(condition->right_sat[1]);
bobbens@2500
   556
         dest->u.condition[1].left_saturation = CLAMP(condition->left_sat[1]);
bobbens@2500
   557
         dest->u.condition[1].right_coeff = condition->right_coeff[1];
bobbens@2500
   558
         dest->u.condition[1].left_coeff = condition->left_coeff[1];  
bobbens@2500
   559
         dest->u.condition[1].deadband = CLAMP(condition->deadband[1]);
bobbens@2500
   560
         dest->u.condition[1].center = condition->center[1];
bobbens@2482
   561
bobbens@2482
   562
         break;
bobbens@2482
   563
bobbens@2482
   564
      case SDL_HAPTIC_RAMP:
bobbens@2482
   565
         ramp = &src->ramp;
bobbens@2482
   566
bobbens@2482
   567
         /* Header */
bobbens@2482
   568
         dest->type = FF_RAMP;
bobbens@2500
   569
         dest->direction = SDL_SYS_ToDirection(&ramp->direction);
bobbens@2482
   570
bobbens@2482
   571
         /* Replay */
bobbens@2482
   572
         dest->replay.length = CLAMP(ramp->length);
bobbens@2482
   573
         dest->replay.delay = CLAMP(ramp->delay);
bobbens@2482
   574
bobbens@2482
   575
         /* Trigger */
bobbens@2482
   576
         dest->trigger.button = CLAMP(ramp->button);
bobbens@2482
   577
         dest->trigger.interval = CLAMP(ramp->interval);
bobbens@2482
   578
bobbens@2482
   579
         /* Ramp */
bobbens@2482
   580
         dest->u.ramp.start_level = ramp->start;
bobbens@2482
   581
         dest->u.ramp.end_level = ramp->end;
bobbens@2482
   582
bobbens@2482
   583
         /* Envelope */
bobbens@2482
   584
         dest->u.ramp.envelope.attack_length = CLAMP(ramp->attack_length);
bobbens@2482
   585
         dest->u.ramp.envelope.attack_level = CLAMP(ramp->attack_level);
bobbens@2482
   586
         dest->u.ramp.envelope.fade_length = CLAMP(ramp->fade_length);
bobbens@2482
   587
         dest->u.ramp.envelope.fade_level = CLAMP(ramp->fade_level);
bobbens@2482
   588
bobbens@2482
   589
         break;
bobbens@2482
   590
bobbens@2482
   591
bobbens@2479
   592
      default:
bobbens@2496
   593
         SDL_SetError("Unknown haptic effect type");
bobbens@2479
   594
         return -1;
bobbens@2479
   595
   }
bobbens@2479
   596
bobbens@2479
   597
   return 0;
bobbens@2479
   598
}
bobbens@2479
   599
bobbens@2483
   600
bobbens@2479
   601
/*
bobbens@2477
   602
 * Creates a new haptic effect.
bobbens@2477
   603
 */
bobbens@2477
   604
int
bobbens@2480
   605
SDL_SYS_HapticNewEffect(SDL_Haptic * haptic, struct haptic_effect * effect,
bobbens@2480
   606
      SDL_HapticEffect * base)
bobbens@2477
   607
{
bobbens@2480
   608
   struct ff_effect * linux_effect;
bobbens@2480
   609
bobbens@2479
   610
   /* Allocate the hardware effect */
bobbens@2479
   611
   effect->hweffect = (struct haptic_hweffect *) 
bobbens@2479
   612
         SDL_malloc(sizeof(struct haptic_hweffect));
bobbens@2479
   613
   if (effect->hweffect == NULL) {
bobbens@2479
   614
      SDL_OutOfMemory();
bobbens@2479
   615
      return -1;
bobbens@2479
   616
   }
bobbens@2479
   617
bobbens@2479
   618
   /* Prepare the ff_effect */
bobbens@2480
   619
   linux_effect = &effect->hweffect->effect;
bobbens@2480
   620
   if (SDL_SYS_ToFFEffect( linux_effect, base ) != 0) {
bobbens@2488
   621
      goto new_effect_err;
bobbens@2479
   622
   }
bobbens@2480
   623
   linux_effect->id = -1; /* Have the kernel give it an id */
bobbens@2479
   624
bobbens@2479
   625
   /* Upload the effect */
bobbens@2480
   626
   if (ioctl(haptic->hwdata->fd, EVIOCSFF, linux_effect) < 0) {
bobbens@2496
   627
      SDL_SetError("Error uploading effect to the haptic device: %s", strerror(errno));
bobbens@2488
   628
      goto new_effect_err;
bobbens@2488
   629
   }
bobbens@2488
   630
bobbens@2488
   631
   return 0;
bobbens@2488
   632
bobbens@2488
   633
new_effect_err:
bobbens@2488
   634
   free(effect->hweffect);
bobbens@2488
   635
   effect->hweffect = NULL;
bobbens@2488
   636
   return -1;
bobbens@2488
   637
}
bobbens@2488
   638
bobbens@2488
   639
bobbens@2488
   640
/*
bobbens@2488
   641
 * Updates an effect.
bobbens@2488
   642
 *
bobbens@2488
   643
 * Note: Dynamically updating the direction can in some cases force
bobbens@2488
   644
 * the effect to restart and run once.
bobbens@2488
   645
 */
bobbens@2488
   646
int SDL_SYS_HapticUpdateEffect(SDL_Haptic * haptic,
bobbens@2488
   647
      struct haptic_effect * effect, SDL_HapticEffect * data)
bobbens@2488
   648
{
bobbens@2488
   649
   struct ff_effect linux_effect;
bobbens@2488
   650
bobbens@2488
   651
   /* Create the new effect */
bobbens@2488
   652
   if (SDL_SYS_ToFFEffect( &linux_effect, data ) != 0) {
bobbens@2488
   653
      return -1;
bobbens@2488
   654
   }
bobbens@2488
   655
   linux_effect.id = effect->hweffect->effect.id;
bobbens@2488
   656
bobbens@2488
   657
   /* See if it can be uploaded. */
bobbens@2488
   658
   if (ioctl(haptic->hwdata->fd, EVIOCSFF, &linux_effect) < 0) {
bobbens@2496
   659
      SDL_SetError("Error updating the haptic effect: %s", strerror(errno));
bobbens@2479
   660
      return -1;
bobbens@2479
   661
   }
bobbens@2479
   662
bobbens@2488
   663
   /* Copy the new effect into memory. */
bobbens@2488
   664
   SDL_memcpy( &effect->hweffect->effect, &linux_effect, sizeof(struct ff_effect) );
bobbens@2488
   665
bobbens@2488
   666
   return effect->hweffect->effect.id;
bobbens@2477
   667
}
bobbens@2477
   668
bobbens@2474
   669
bobbens@2479
   670
/*
bobbens@2479
   671
 * Runs an effect.
bobbens@2479
   672
 */
bobbens@2479
   673
int
bobbens@2479
   674
SDL_SYS_HapticRunEffect(SDL_Haptic * haptic, struct haptic_effect * effect)
bobbens@2479
   675
{
bobbens@2479
   676
   struct input_event run;
bobbens@2479
   677
bobbens@2479
   678
   /* Prepare to run the effect */
bobbens@2479
   679
   run.type = EV_FF;
bobbens@2479
   680
   run.code = effect->hweffect->effect.id;
bobbens@2479
   681
   run.value = 1;
bobbens@2479
   682
bobbens@2479
   683
   if (write(haptic->hwdata->fd, (const void*) &run, sizeof(run)) < 0) {
bobbens@2496
   684
      SDL_SetError("Unable to run the haptic effect: %s", strerror(errno));
bobbens@2479
   685
      return -1;
bobbens@2479
   686
   }
bobbens@2479
   687
bobbens@2479
   688
   return 0;
bobbens@2479
   689
}
bobbens@2479
   690
bobbens@2479
   691
bobbens@2479
   692
/*
bobbens@2485
   693
 * Stops an effect.
bobbens@2485
   694
 */
bobbens@2485
   695
int
bobbens@2485
   696
SDL_SYS_HapticStopEffect(SDL_Haptic * haptic, struct haptic_effect * effect)
bobbens@2485
   697
{
bobbens@2485
   698
   struct input_event stop;
bobbens@2485
   699
bobbens@2485
   700
   stop.type = EV_FF;
bobbens@2485
   701
   stop.code = effect->hweffect->effect.id;
bobbens@2485
   702
   stop.value = 0;
bobbens@2485
   703
bobbens@2485
   704
   if (write(haptic->hwdata->fd, (const void*) &stop, sizeof(stop)) < 0) {
bobbens@2496
   705
      SDL_SetError("Unable to stop the haptic effect: %s", strerror(errno));
bobbens@2485
   706
      return -1;
bobbens@2485
   707
   }
bobbens@2485
   708
bobbens@2485
   709
   return 0;
bobbens@2485
   710
}
bobbens@2485
   711
bobbens@2485
   712
bobbens@2485
   713
/*
bobbens@2487
   714
 * Frees the effect.
bobbens@2479
   715
 */
bobbens@2479
   716
void
bobbens@2479
   717
SDL_SYS_HapticDestroyEffect(SDL_Haptic * haptic, struct haptic_effect * effect)
bobbens@2479
   718
{
bobbens@2479
   719
   if (ioctl(haptic->hwdata->fd, EVIOCRMFF, effect->hweffect->effect.id) < 0) {
bobbens@2496
   720
      SDL_SetError("Error removing the effect from the haptic device: %s",
bobbens@2496
   721
            strerror(errno));
bobbens@2479
   722
   }
bobbens@2479
   723
   SDL_free(effect->hweffect);
bobbens@2479
   724
   effect->hweffect = NULL;
bobbens@2479
   725
}
bobbens@2479
   726
bobbens@2479
   727
bobbens@2483
   728
/*
bobbens@2495
   729
 * Gets the status of a haptic effect.
bobbens@2495
   730
 */
bobbens@2495
   731
int
bobbens@2495
   732
SDL_SYS_HapticGetEffectStatus(SDL_Haptic * haptic, struct haptic_effect * effect)
bobbens@2495
   733
{
bobbens@2495
   734
#if 0  /* Not supported atm. */
bobbens@2495
   735
   struct input_event ie;
bobbens@2495
   736
bobbens@2495
   737
   ie.type = EV_FF;
bobbens@2495
   738
   ie.type = EV_FF_STATUS;
bobbens@2495
   739
   ie.code = effect->hweffect->effect.id;
bobbens@2495
   740
bobbens@2495
   741
   if (write(haptic->hwdata->fd, &ie, sizeof(ie)) < 0) {
bobbens@2495
   742
      SDL_SetError("Error getting haptic device status.");
bobbens@2495
   743
      return -1;
bobbens@2495
   744
   }
bobbens@2495
   745
bobbens@2495
   746
   return 0;
bobbens@2495
   747
#endif
bobbens@2495
   748
bobbens@2495
   749
   return -1;
bobbens@2495
   750
}
bobbens@2495
   751
bobbens@2495
   752
bobbens@2495
   753
/*
bobbens@2483
   754
 * Sets the gain.
bobbens@2483
   755
 */
bobbens@2483
   756
int
bobbens@2483
   757
SDL_SYS_HapticSetGain(SDL_Haptic * haptic, int gain)
bobbens@2483
   758
{
bobbens@2483
   759
   struct input_event ie;
bobbens@2483
   760
bobbens@2483
   761
   ie.type = EV_FF;
bobbens@2483
   762
   ie.code = FF_GAIN;
bobbens@2483
   763
   ie.value = (0xFFFFUL * gain) / 100;
bobbens@2483
   764
bobbens@2484
   765
   if (write(haptic->hwdata->fd, &ie, sizeof(ie)) < 0) {
bobbens@2496
   766
      SDL_SetError("Error setting gain: %s", strerror(errno));
bobbens@2484
   767
      return -1;
bobbens@2483
   768
   }
bobbens@2483
   769
bobbens@2484
   770
   return 0;
bobbens@2483
   771
}
bobbens@2483
   772
bobbens@2483
   773
bobbens@2484
   774
/*
bobbens@2484
   775
 * Sets the autocentering.
bobbens@2484
   776
 */
bobbens@2484
   777
int
bobbens@2484
   778
SDL_SYS_HapticSetAutocenter(SDL_Haptic * haptic, int autocenter)
bobbens@2484
   779
{
bobbens@2484
   780
   struct input_event ie;
bobbens@2484
   781
bobbens@2484
   782
   ie.type = EV_FF;
bobbens@2484
   783
   ie.code = FF_AUTOCENTER;
bobbens@2484
   784
   ie.value = (0xFFFFUL * autocenter) / 100;
bobbens@2484
   785
bobbens@2484
   786
   if (write(haptic->hwdata->fd, &ie, sizeof(ie)) < 0) {
bobbens@2496
   787
      SDL_SetError("Error setting autocenter: %s", strerror(errno));
bobbens@2484
   788
      return -1;
bobbens@2484
   789
   }
bobbens@2484
   790
bobbens@2484
   791
   return 0;
bobbens@2484
   792
}
bobbens@2484
   793
bobbens@2484
   794
bobbens@2472
   795
#endif /* SDL_HAPTIC_LINUX */