annotate src/haptic/linux/SDL_syshaptic.c @ 2476:242d8a668ebb gsoc2008_force_feedback

* Implemented opening and closing of haptic devices.
author Edgar Simo <bobbens@gmail.com>
date Mon, 23 Jun 2008 09:01:58 +0000
parents 4b874e3a3a2c
children 97f75ea43a93
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 2008 Edgar Simo
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #ifdef SDL_JOYSTICK_LINUX
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25
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26 #include "SDL_haptic.h"
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27 #include "../SDL_haptic_c.h"
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28 #include "../SDL_syshaptic.h"
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29
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30 #include <unistd.h> /* close */
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31 #include <linux/input.h>
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32 #include <sys/ioctl.h>
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33 #include <sys/types.h>
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34 #include <sys/stat.h>
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35 #include <fcntl.h>
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36 #include <linux/limits.h>
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37 #include <string.h>
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38
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39
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40 #define MAX_HAPTICS 32
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41
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42
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43 /*
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44 * List of available haptic devices.
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45 */
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46 static struct
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47 {
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48 char *fname;
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49 SDL_Haptic *haptic;
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50 } SDL_hapticlist[MAX_HAPTICS];
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51
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52
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53 /*
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54 * Haptic system hardware data.
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55 */
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56 struct haptic_hwdata
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57 {
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58 int fd;
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59 };
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60
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61
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62
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63 #define test_bit(nr, addr) \
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64 (((1UL << ((nr) & 31)) & (((const unsigned int *) addr)[(nr) >> 5])) != 0)
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65 #define EV_TEST(ev,f) \
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66 if (test_bit((ev), features)) ret |= (f);
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67 /*
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68 * Test whether a device has haptic properties.
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69 * Returns available properties or 0 if there are none.
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70 */
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71 static int
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72 EV_IsHaptic(int fd)
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73 {
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74 unsigned int ret;
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75 unsigned long features[1 + FF_MAX/sizeof(unsigned long)];
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76
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77 ret = 0;
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78
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79 ioctl(fd, EVIOCGBIT(EV_FF, sizeof(unsigned long) * 4), features);
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80
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81 EV_TEST(FF_CONSTANT, SDL_HAPTIC_CONSTANT);
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82 EV_TEST(FF_PERIODIC, SDL_HAPTIC_PERIODIC);
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83 EV_TEST(FF_RAMP, SDL_HAPTIC_RAMP);
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84 EV_TEST(FF_SPRING, SDL_HAPTIC_SPRING);
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85 EV_TEST(FF_FRICTION, SDL_HAPTIC_FRICTION);
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86 EV_TEST(FF_DAMPER, SDL_HAPTIC_DAMPER);
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87 EV_TEST(FF_RUMBLE, SDL_HAPTIC_RUMBLE);
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88 EV_TEST(FF_INERTIA, SDL_HAPTIC_INERTIA);
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89 EV_TEST(FF_GAIN, SDL_HAPTIC_GAIN);
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90 EV_TEST(FF_AUTOCENTER, SDL_HAPTIC_AUTOCENTER);
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91
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92 return ret;
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93 }
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94
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95 int
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96 SDL_SYS_HapticInit(void)
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97 {
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98 const char joydev_pattern[] = "/dev/input/event%d";
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99 dev_t dev_nums[MAX_HAPTICS];
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100 char path[PATH_MAX];
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101 struct stat sb;
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102 int fd;
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103 int i, j, k;
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104 int duplicate;
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105 int numhaptics;
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106
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107 numhaptics = 0;
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108
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109 i = 0;
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110 for (j = 0; j < MAX_HAPTICS; ++j) {
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111
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112 snprintf(path, PATH_MAX, joydev_pattern, i++);
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113
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114 /* check to see if file exists */
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115 if (stat(path,&sb) != 0)
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116 break;
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117
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118 /* check for duplicates */
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119 duplicate = 0;
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120 for (k = 0; (k < numhaptics) && !duplicate; ++k) {
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121 if (sb.st_rdev == dev_nums[k]) {
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122 duplicate = 1;
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123 }
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124 }
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125 if (duplicate) {
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126 continue;
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127 }
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128
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129 /* try to open */
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130 fd = open(path, O_RDWR, 0);
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131 if (fd < 0) continue;
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132
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133 #ifdef DEBUG_INPUT_EVENTS
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134 printf("Checking %s\n", path);
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135 #endif
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136
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137 /* see if it works */
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138 if (EV_IsHaptic(fd)!=0) {
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139 SDL_hapticlist[numhaptics].fname = SDL_strdup(path);
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140 SDL_hapticlist[numhaptics].haptic = NULL;
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141 dev_nums[numhaptics] = sb.st_rdev;
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142 ++numhaptics;
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143 }
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144 close(fd);
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145 }
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146
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147 return numhaptics;
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148 }
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149
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150
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151 /*
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152 * Return the name of a haptic device, does not need to be opened.
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153 */
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154 const char *
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155 SDL_SYS_HapticName(int index)
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156 {
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157 int fd;
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158 static char namebuf[128];
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159 char *name;
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160
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161 name = NULL;
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162 fd = open(SDL_hapticlist[index].fname, O_RDONLY, 0);
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163 if (fd >= 0) {
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164 if (ioctl(fd, EVIOCGNAME(sizeof(namebuf)), namebuf) <= 0) {
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165 name = SDL_hapticlist[index].fname;
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166 }
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167 else {
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168 name = namebuf;
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169 }
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170 }
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171 close(fd);
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172
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173 return name;
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174 }
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175
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176
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177 /*
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178 * Opens a haptic device for usage.
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179 */
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180 int
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181 SDL_SYS_HapticOpen(SDL_Haptic * haptic)
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182 {
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183 int fd;
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184
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185 /* Open the character device */
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186 fd = open(SDL_hapticlist[haptic->index].fname, O_RDWR, 0);
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187 if (fd < 0) {
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188 SDL_SetError("Unable to open %s\n", SDL_hapticlist[haptic->index]);
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189 return (-1);
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190 }
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191
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192 /* Allocate the hwdata */
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193 haptic->hwdata = (struct haptic_hwdata *)
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194 SDL_malloc(sizeof(*haptic->hwdata));
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195 if (haptic->hwdata == NULL) {
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196 SDL_OutOfMemory();
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197 close(fd);
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198 return (-1);
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199 }
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200 SDL_memset(haptic->hwdata, 0, sizeof(*haptic->hwdata));
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201
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202 /* Set the hwdata */
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203 haptic->hwdata->fd = fd;
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204
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205 return 0;
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206 }
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207
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208
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209 /*
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210 * Closes the haptic device.
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211 */
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212 void
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213 SDL_SYS_HapticClose(SDL_Haptic * haptic)
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214 {
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215 if (haptic->hwdata) {
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216
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217 /* Clean up */
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218 close(haptic->hwdata->fd);
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219
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220 /* Free */
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221 SDL_free(haptic->hwdata);
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222 haptic->hwdata = NULL;
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223
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224 }
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225 }
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226
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227
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228 /* Clean up after system specific haptic stuff */
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229 void
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230 SDL_SYS_HapticQuit(void)
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231 {
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232 int i;
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233
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234 for (i=0; SDL_hapticlist[i].fname != NULL; i++) {
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235 SDL_free(SDL_hapticlist[i].fname);
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236 }
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237 SDL_hapticlist[0].fname = NULL;
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238 }
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239
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240
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241 #endif /* SDL_HAPTIC_LINUX */