Mercurial > sdl-ios-xcode
annotate src/haptic/linux/SDL_syshaptic.c @ 2481:5d0ea4576f20 gsoc2008_force_feedback
More comments.
Clamped values in struct ff_effect.
Added waveforms.
author | Edgar Simo <bobbens@gmail.com> |
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date | Tue, 01 Jul 2008 10:44:42 +0000 |
parents | b883974445fc |
children | b51ad78812d5 |
rev | line source |
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2472
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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> |
2480 | 38 #include <errno.h> |
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39 |
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40 |
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41 #define MAX_HAPTICS 32 |
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42 |
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43 |
2475 | 44 /* |
45 * List of available haptic devices. | |
46 */ | |
2472
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47 static struct |
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48 { |
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49 char *fname; |
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50 SDL_Haptic *haptic; |
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51 } SDL_hapticlist[MAX_HAPTICS]; |
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52 |
2475 | 53 |
54 /* | |
55 * Haptic system hardware data. | |
56 */ | |
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57 struct haptic_hwdata |
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58 { |
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59 int fd; |
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60 }; |
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61 |
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62 |
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63 /* |
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64 * Haptic system effect data. |
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65 */ |
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66 struct haptic_hweffect |
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67 { |
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68 struct ff_effect effect; |
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69 }; |
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70 |
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71 |
2475 | 72 |
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73 #define test_bit(nr, addr) \ |
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74 (((1UL << ((nr) & 31)) & (((const unsigned int *) addr)[(nr) >> 5])) != 0) |
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75 #define EV_TEST(ev,f) \ |
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76 if (test_bit((ev), features)) ret |= (f); |
2475 | 77 /* |
78 * Test whether a device has haptic properties. | |
79 * Returns available properties or 0 if there are none. | |
80 */ | |
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81 static int |
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82 EV_IsHaptic(int fd) |
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83 { |
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84 unsigned int ret; |
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85 unsigned long features[1 + FF_MAX/sizeof(unsigned long)]; |
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86 |
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87 ret = 0; |
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88 |
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89 ioctl(fd, EVIOCGBIT(EV_FF, sizeof(unsigned long) * 4), features); |
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90 |
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91 EV_TEST(FF_CONSTANT, SDL_HAPTIC_CONSTANT); |
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92 EV_TEST(FF_PERIODIC, SDL_HAPTIC_PERIODIC); |
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93 EV_TEST(FF_RAMP, SDL_HAPTIC_RAMP); |
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94 EV_TEST(FF_SPRING, SDL_HAPTIC_SPRING); |
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95 EV_TEST(FF_FRICTION, SDL_HAPTIC_FRICTION); |
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96 EV_TEST(FF_DAMPER, SDL_HAPTIC_DAMPER); |
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97 EV_TEST(FF_RUMBLE, SDL_HAPTIC_RUMBLE); |
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98 EV_TEST(FF_INERTIA, SDL_HAPTIC_INERTIA); |
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99 EV_TEST(FF_GAIN, SDL_HAPTIC_GAIN); |
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100 EV_TEST(FF_AUTOCENTER, SDL_HAPTIC_AUTOCENTER); |
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101 |
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102 return ret; |
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103 } |
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104 |
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105 int |
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106 SDL_SYS_HapticInit(void) |
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107 { |
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108 const char joydev_pattern[] = "/dev/input/event%d"; |
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109 dev_t dev_nums[MAX_HAPTICS]; |
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110 char path[PATH_MAX]; |
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111 struct stat sb; |
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112 int fd; |
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113 int i, j, k; |
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114 int duplicate; |
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115 int numhaptics; |
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116 |
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117 numhaptics = 0; |
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118 |
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119 i = 0; |
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120 for (j = 0; j < MAX_HAPTICS; ++j) { |
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121 |
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122 snprintf(path, PATH_MAX, joydev_pattern, i++); |
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123 |
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124 /* check to see if file exists */ |
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125 if (stat(path,&sb) != 0) |
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126 break; |
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127 |
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128 /* check for duplicates */ |
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129 duplicate = 0; |
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130 for (k = 0; (k < numhaptics) && !duplicate; ++k) { |
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131 if (sb.st_rdev == dev_nums[k]) { |
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132 duplicate = 1; |
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133 } |
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134 } |
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135 if (duplicate) { |
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136 continue; |
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137 } |
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138 |
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139 /* try to open */ |
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140 fd = open(path, O_RDWR, 0); |
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141 if (fd < 0) continue; |
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142 |
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143 #ifdef DEBUG_INPUT_EVENTS |
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144 printf("Checking %s\n", path); |
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145 #endif |
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146 |
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147 /* see if it works */ |
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148 if (EV_IsHaptic(fd)!=0) { |
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149 SDL_hapticlist[numhaptics].fname = SDL_strdup(path); |
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150 SDL_hapticlist[numhaptics].haptic = NULL; |
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151 dev_nums[numhaptics] = sb.st_rdev; |
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152 ++numhaptics; |
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153 } |
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154 close(fd); |
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155 } |
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156 |
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157 return numhaptics; |
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158 } |
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159 |
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160 |
2475 | 161 /* |
162 * Return the name of a haptic device, does not need to be opened. | |
163 */ | |
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164 const char * |
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165 SDL_SYS_HapticName(int index) |
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166 { |
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167 int fd; |
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168 static char namebuf[128]; |
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169 char *name; |
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170 |
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171 name = NULL; |
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172 fd = open(SDL_hapticlist[index].fname, O_RDONLY, 0); |
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173 if (fd >= 0) { |
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174 if (ioctl(fd, EVIOCGNAME(sizeof(namebuf)), namebuf) <= 0) { |
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175 name = SDL_hapticlist[index].fname; |
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176 } |
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177 else { |
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178 name = namebuf; |
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179 } |
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180 } |
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181 close(fd); |
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182 |
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183 return name; |
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184 } |
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185 |
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186 |
2475 | 187 /* |
188 * Opens a haptic device for usage. | |
189 */ | |
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190 int |
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191 SDL_SYS_HapticOpen(SDL_Haptic * haptic) |
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192 { |
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193 int i; |
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194 int fd; |
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195 |
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196 /* Open the character device */ |
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197 fd = open(SDL_hapticlist[haptic->index].fname, O_RDWR, 0); |
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198 if (fd < 0) { |
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199 SDL_SetError("Unable to open %s\n", SDL_hapticlist[haptic->index]); |
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200 return -1; |
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201 } |
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202 |
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203 /* Allocate the hwdata */ |
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204 haptic->hwdata = (struct haptic_hwdata *) |
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205 SDL_malloc(sizeof(*haptic->hwdata)); |
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206 if (haptic->hwdata == NULL) { |
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207 SDL_OutOfMemory(); |
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208 goto open_err; |
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209 } |
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210 SDL_memset(haptic->hwdata, 0, sizeof(*haptic->hwdata)); |
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211 /* Set the data */ |
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212 haptic->hwdata->fd = fd; |
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213 haptic->supported = EV_IsHaptic(fd); |
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214 |
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215 /* Set the effects */ |
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216 if (ioctl(fd, EVIOCGEFFECTS, &haptic->neffects) < 0) { |
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217 SDL_SetError("Unable to query haptic device memory."); |
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218 goto open_err; |
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219 } |
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220 haptic->effects = (struct haptic_effect *) |
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221 SDL_malloc(sizeof(struct haptic_effect) * haptic->neffects); |
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222 if (haptic->effects == NULL) { |
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223 SDL_OutOfMemory(); |
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224 goto open_err; |
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225 } |
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226 |
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227 return 0; |
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228 |
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229 /* Error handling */ |
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230 open_err: |
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231 close(fd); |
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232 if (haptic->hwdata != NULL) { |
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233 free(haptic->hwdata); |
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234 haptic->hwdata = NULL; |
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235 } |
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236 return -1; |
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237 } |
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238 |
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239 |
2475 | 240 /* |
241 * Closes the haptic device. | |
242 */ | |
243 void | |
244 SDL_SYS_HapticClose(SDL_Haptic * haptic) | |
245 { | |
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246 if (haptic->hwdata) { |
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247 |
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248 /* Clean up */ |
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249 close(haptic->hwdata->fd); |
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250 |
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251 /* Free */ |
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252 SDL_free(haptic->hwdata); |
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253 haptic->hwdata = NULL; |
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254 SDL_free(haptic->effects); |
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255 haptic->neffects = 0; |
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256 } |
2475 | 257 } |
258 | |
259 | |
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260 /* |
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261 * Clean up after system specific haptic stuff |
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262 */ |
2474
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263 void |
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264 SDL_SYS_HapticQuit(void) |
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Properly quit the SDL_haptic subsystem.
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265 { |
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266 int i; |
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267 |
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268 for (i=0; SDL_hapticlist[i].fname != NULL; i++) { |
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269 SDL_free(SDL_hapticlist[i].fname); |
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270 } |
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271 SDL_hapticlist[0].fname = NULL; |
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272 } |
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273 |
2481 | 274 #define CLAMP(x) (((x) > 32767) ? 32767 : x) |
2477
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275 /* |
2479
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276 * Initializes the linux effect struct from a haptic_effect. |
2481 | 277 * Values above 32767 (for unsigned) are unspecified so we must clamp. |
2479
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278 */ |
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279 static int |
2480 | 280 SDL_SYS_ToFFEffect( struct ff_effect * dest, SDL_HapticEffect * src ) |
2479
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281 { |
2480 | 282 SDL_HapticConstant *constant; |
283 SDL_HapticPeriodic *periodic; | |
284 | |
285 /* Clear up */ | |
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286 SDL_memset(dest, 0, sizeof(struct ff_effect)); |
2480 | 287 |
288 switch (src->type) { | |
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289 case SDL_HAPTIC_CONSTANT: |
2480 | 290 constant = &src->constant; |
291 | |
292 /* Header */ | |
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293 dest->type = FF_CONSTANT; |
2481 | 294 dest->direction = CLAMP(constant->direction); |
2480 | 295 |
296 /* Replay */ | |
2481 | 297 dest->replay.length = CLAMP(constant->length); |
298 dest->replay.delay = CLAMP(constant->delay); | |
2480 | 299 |
300 /* Trigger */ | |
2481 | 301 dest->trigger.button = CLAMP(constant->button); |
302 dest->trigger.interval = CLAMP(constant->interval); | |
2480 | 303 |
304 /* Constant */ | |
305 dest->u.constant.level = constant->level; | |
306 | |
307 /* Envelope */ | |
2481 | 308 dest->u.constant.envelope.attack_length = CLAMP(constant->attack_length); |
309 dest->u.constant.envelope.attack_level = CLAMP(constant->attack_level); | |
310 dest->u.constant.envelope.fade_length = CLAMP(constant->fade_length); | |
311 dest->u.constant.envelope.fade_level = CLAMP(constant->fade_level); | |
2480 | 312 |
313 break; | |
314 | |
315 case SDL_HAPTIC_PERIODIC: | |
316 periodic = &src->periodic; | |
317 | |
318 /* Header */ | |
319 dest->type = FF_PERIODIC; | |
2481 | 320 dest->direction = CLAMP(periodic->direction); |
2480 | 321 |
322 /* Replay */ | |
2481 | 323 dest->replay.length = CLAMP(periodic->length); |
324 dest->replay.delay = CLAMP(periodic->delay); | |
2480 | 325 |
326 /* Trigger */ | |
2481 | 327 dest->trigger.button = CLAMP(periodic->button); |
328 dest->trigger.interval = CLAMP(periodic->interval); | |
2480 | 329 |
330 /* Constant */ | |
2481 | 331 switch (periodic->waveform) { |
332 case SDL_WAVEFORM_SINE: | |
333 dest->u.periodic.waveform = FF_SINE; | |
334 break; | |
335 case SDL_WAVEFORM_SQUARE: | |
336 dest->u.periodic.waveform = FF_SQUARE; | |
337 break; | |
338 case SDL_WAVEFORM_TRIANGLE: | |
339 dest->u.periodic.waveform = FF_TRIANGLE; | |
340 break; | |
341 case SDL_WAVEFORM_SAWTOOTHUP: | |
342 dest->u.periodic.waveform = FF_SAW_UP; | |
343 break; | |
344 case SDL_WAVEFORM_SAWTOOTHDOWN: | |
345 dest->u.periodic.waveform = FF_SAW_DOWN; | |
346 break; | |
347 | |
348 default: | |
349 SDL_SetError("Unknown waveform."); | |
350 return -1; | |
351 } | |
352 dest->u.periodic.period = CLAMP(periodic->period); | |
2480 | 353 dest->u.periodic.magnitude = periodic->magnitude; |
354 dest->u.periodic.offset = periodic->offset; | |
2481 | 355 dest->u.periodic.phase = CLAMP(periodic->phase); |
2480 | 356 |
357 /* Envelope */ | |
2481 | 358 dest->u.periodic.envelope.attack_length = CLAMP(periodic->attack_length); |
359 dest->u.periodic.envelope.attack_level = CLAMP(periodic->attack_level); | |
360 dest->u.periodic.envelope.fade_length = CLAMP(periodic->fade_length); | |
361 dest->u.periodic.envelope.fade_level = CLAMP(periodic->fade_level); | |
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362 |
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363 break; |
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364 |
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365 default: |
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366 SDL_SetError("Unknown haptic effect type."); |
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367 return -1; |
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368 } |
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369 |
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370 return 0; |
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371 } |
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372 |
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373 /* |
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374 * Creates a new haptic effect. |
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375 */ |
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376 int |
2480 | 377 SDL_SYS_HapticNewEffect(SDL_Haptic * haptic, struct haptic_effect * effect, |
378 SDL_HapticEffect * base) | |
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379 { |
2480 | 380 struct ff_effect * linux_effect; |
381 | |
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382 /* Allocate the hardware effect */ |
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383 effect->hweffect = (struct haptic_hweffect *) |
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384 SDL_malloc(sizeof(struct haptic_hweffect)); |
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385 if (effect->hweffect == NULL) { |
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386 SDL_OutOfMemory(); |
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387 return -1; |
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388 } |
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389 |
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390 /* Prepare the ff_effect */ |
2480 | 391 linux_effect = &effect->hweffect->effect; |
392 if (SDL_SYS_ToFFEffect( linux_effect, base ) != 0) { | |
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393 return -1; |
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394 } |
2480 | 395 linux_effect->id = -1; /* Have the kernel give it an id */ |
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396 |
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397 /* Upload the effect */ |
2480 | 398 if (ioctl(haptic->hwdata->fd, EVIOCSFF, linux_effect) < 0) { |
399 SDL_SetError("Error uploading effect to the haptic device: %s", | |
400 strerror(errno)); | |
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401 return -1; |
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402 } |
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403 |
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404 return 0; |
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405 } |
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406 |
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407 |
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408 /* |
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409 * Runs an effect. |
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410 */ |
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411 int |
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412 SDL_SYS_HapticRunEffect(SDL_Haptic * haptic, struct haptic_effect * effect) |
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413 { |
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414 struct input_event run; |
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415 |
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416 /* Prepare to run the effect */ |
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417 run.type = EV_FF; |
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418 run.code = effect->hweffect->effect.id; |
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419 run.value = 1; |
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420 |
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421 if (write(haptic->hwdata->fd, (const void*) &run, sizeof(run)) < 0) { |
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422 SDL_SetError("Unable to run the haptic effect."); |
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423 return -1; |
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424 } |
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425 |
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426 return 0; |
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427 } |
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428 |
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429 |
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430 /* |
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431 * Frees the effect |
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432 */ |
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433 void |
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434 SDL_SYS_HapticDestroyEffect(SDL_Haptic * haptic, struct haptic_effect * effect) |
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435 { |
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436 if (ioctl(haptic->hwdata->fd, EVIOCRMFF, effect->hweffect->effect.id) < 0) { |
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437 SDL_SetError("Error removing the effect from the haptic device."); |
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438 } |
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439 SDL_free(effect->hweffect); |
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440 effect->hweffect = NULL; |
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441 } |
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442 |
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443 |
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444 #endif /* SDL_HAPTIC_LINUX */ |