1/* mixer.c 2** 3** Copyright 2011, The Android Open Source Project 4** 5** Redistribution and use in source and binary forms, with or without 6** modification, are permitted provided that the following conditions are met: 7** * Redistributions of source code must retain the above copyright 8** notice, this list of conditions and the following disclaimer. 9** * Redistributions in binary form must reproduce the above copyright 10** notice, this list of conditions and the following disclaimer in the 11** documentation and/or other materials provided with the distribution. 12** * Neither the name of The Android Open Source Project nor the names of 13** its contributors may be used to endorse or promote products derived 14** from this software without specific prior written permission. 15** 16** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND 17** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE 20** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 23** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH 26** DAMAGE. 27*/ 28 29#include <stdio.h> 30#include <stdlib.h> 31#include <string.h> 32#include <unistd.h> 33#include <fcntl.h> 34#include <errno.h> 35#include <ctype.h> 36 37#include <sys/ioctl.h> 38 39#include <linux/ioctl.h> 40#define __force 41#define __bitwise 42#define __user 43#include <sound/asound.h> 44 45#include <tinyalsa/asoundlib.h> 46 47struct mixer_ctl { 48 struct mixer *mixer; 49 struct snd_ctl_elem_info *info; 50 char **ename; 51}; 52 53struct mixer { 54 int fd; 55 struct snd_ctl_elem_info *info; 56 struct mixer_ctl *ctl; 57 unsigned int count; 58}; 59 60void mixer_close(struct mixer *mixer) 61{ 62 unsigned int n,m; 63 64 if (!mixer) 65 return; 66 67 if (mixer->fd >= 0) 68 close(mixer->fd); 69 70 if (mixer->ctl) { 71 for (n = 0; n < mixer->count; n++) { 72 if (mixer->ctl[n].ename) { 73 unsigned int max = mixer->ctl[n].info->value.enumerated.items; 74 for (m = 0; m < max; m++) 75 free(mixer->ctl[n].ename[m]); 76 free(mixer->ctl[n].ename); 77 } 78 } 79 free(mixer->ctl); 80 } 81 82 if (mixer->info) 83 free(mixer->info); 84 85 free(mixer); 86 87 /* TODO: verify frees */ 88} 89 90struct mixer *mixer_open(unsigned int card) 91{ 92 struct snd_ctl_elem_list elist; 93 struct snd_ctl_elem_info tmp; 94 struct snd_ctl_elem_id *eid = NULL; 95 struct mixer *mixer = NULL; 96 unsigned int n, m; 97 int fd; 98 char fn[256]; 99 100 snprintf(fn, sizeof(fn), "/dev/snd/controlC%u", card); 101 fd = open(fn, O_RDWR); 102 if (fd < 0) 103 return 0; 104 105 memset(&elist, 0, sizeof(elist)); 106 if (ioctl(fd, SNDRV_CTL_IOCTL_ELEM_LIST, &elist) < 0) 107 goto fail; 108 109 mixer = calloc(1, sizeof(*mixer)); 110 if (!mixer) 111 goto fail; 112 113 mixer->ctl = calloc(elist.count, sizeof(struct mixer_ctl)); 114 mixer->info = calloc(elist.count, sizeof(struct snd_ctl_elem_info)); 115 if (!mixer->ctl || !mixer->info) 116 goto fail; 117 118 eid = calloc(elist.count, sizeof(struct snd_ctl_elem_id)); 119 if (!eid) 120 goto fail; 121 122 mixer->count = elist.count; 123 mixer->fd = fd; 124 elist.space = mixer->count; 125 elist.pids = eid; 126 if (ioctl(fd, SNDRV_CTL_IOCTL_ELEM_LIST, &elist) < 0) 127 goto fail; 128 129 for (n = 0; n < mixer->count; n++) { 130 struct snd_ctl_elem_info *ei = mixer->info + n; 131 ei->id.numid = eid[n].numid; 132 if (ioctl(fd, SNDRV_CTL_IOCTL_ELEM_INFO, ei) < 0) 133 goto fail; 134 mixer->ctl[n].info = ei; 135 mixer->ctl[n].mixer = mixer; 136 if (ei->type == SNDRV_CTL_ELEM_TYPE_ENUMERATED) { 137 char **enames = calloc(ei->value.enumerated.items, sizeof(char*)); 138 if (!enames) 139 goto fail; 140 mixer->ctl[n].ename = enames; 141 for (m = 0; m < ei->value.enumerated.items; m++) { 142 memset(&tmp, 0, sizeof(tmp)); 143 tmp.id.numid = ei->id.numid; 144 tmp.value.enumerated.item = m; 145 if (ioctl(fd, SNDRV_CTL_IOCTL_ELEM_INFO, &tmp) < 0) 146 goto fail; 147 enames[m] = strdup(tmp.value.enumerated.name); 148 if (!enames[m]) 149 goto fail; 150 } 151 } 152 } 153 154 free(eid); 155 return mixer; 156 157fail: 158 /* TODO: verify frees in failure case */ 159 if (eid) 160 free(eid); 161 if (mixer) 162 mixer_close(mixer); 163 else if (fd >= 0) 164 close(fd); 165 return 0; 166} 167 168unsigned int mixer_get_num_ctls(struct mixer *mixer) 169{ 170 if (!mixer) 171 return 0; 172 173 return mixer->count; 174} 175 176struct mixer_ctl *mixer_get_ctl(struct mixer *mixer, unsigned int id) 177{ 178 if (mixer && (id < mixer->count)) 179 return mixer->ctl + id; 180 181 return NULL; 182} 183 184struct mixer_ctl *mixer_get_ctl_by_name(struct mixer *mixer, const char *name) 185{ 186 unsigned int n; 187 188 if (!mixer) 189 return NULL; 190 191 for (n = 0; n < mixer->count; n++) 192 if (!strcmp(name, (char*) mixer->info[n].id.name)) 193 return mixer->ctl + n; 194 195 return NULL; 196} 197 198const char *mixer_ctl_get_name(struct mixer_ctl *ctl) 199{ 200 if (!ctl) 201 return NULL; 202 203 return (const char *)ctl->info->id.name; 204} 205 206enum mixer_ctl_type mixer_ctl_get_type(struct mixer_ctl *ctl) 207{ 208 if (!ctl) 209 return MIXER_CTL_TYPE_UNKNOWN; 210 211 switch (ctl->info->type) { 212 case SNDRV_CTL_ELEM_TYPE_BOOLEAN: return MIXER_CTL_TYPE_BOOL; 213 case SNDRV_CTL_ELEM_TYPE_INTEGER: return MIXER_CTL_TYPE_INT; 214 case SNDRV_CTL_ELEM_TYPE_ENUMERATED: return MIXER_CTL_TYPE_ENUM; 215 case SNDRV_CTL_ELEM_TYPE_BYTES: return MIXER_CTL_TYPE_BYTE; 216 case SNDRV_CTL_ELEM_TYPE_IEC958: return MIXER_CTL_TYPE_IEC958; 217 case SNDRV_CTL_ELEM_TYPE_INTEGER64: return MIXER_CTL_TYPE_INT64; 218 default: return MIXER_CTL_TYPE_UNKNOWN; 219 }; 220} 221 222const char *mixer_ctl_get_type_string(struct mixer_ctl *ctl) 223{ 224 if (!ctl) 225 return ""; 226 227 switch (ctl->info->type) { 228 case SNDRV_CTL_ELEM_TYPE_BOOLEAN: return "BOOL"; 229 case SNDRV_CTL_ELEM_TYPE_INTEGER: return "INT"; 230 case SNDRV_CTL_ELEM_TYPE_ENUMERATED: return "ENUM"; 231 case SNDRV_CTL_ELEM_TYPE_BYTES: return "BYTE"; 232 case SNDRV_CTL_ELEM_TYPE_IEC958: return "IEC958"; 233 case SNDRV_CTL_ELEM_TYPE_INTEGER64: return "INT64"; 234 default: return "Unknown"; 235 }; 236} 237 238unsigned int mixer_ctl_get_num_values(struct mixer_ctl *ctl) 239{ 240 if (!ctl) 241 return 0; 242 243 return ctl->info->count; 244} 245 246static int percent_to_int(struct snd_ctl_elem_info *ei, int percent) 247{ 248 int range; 249 250 if (percent > 100) 251 percent = 100; 252 else if (percent < 0) 253 percent = 0; 254 255 range = (ei->value.integer.max - ei->value.integer.min); 256 257 return ei->value.integer.min + (range * percent) / 100; 258} 259 260static int int_to_percent(struct snd_ctl_elem_info *ei, int value) 261{ 262 int range = (ei->value.integer.max - ei->value.integer.min); 263 264 if (range == 0) 265 return 0; 266 267 return ((value - ei->value.integer.min) / range) * 100; 268} 269 270int mixer_ctl_get_percent(struct mixer_ctl *ctl, unsigned int id) 271{ 272 if (!ctl || (ctl->info->type != SNDRV_CTL_ELEM_TYPE_INTEGER)) 273 return -EINVAL; 274 275 return int_to_percent(ctl->info, mixer_ctl_get_value(ctl, id)); 276} 277 278int mixer_ctl_set_percent(struct mixer_ctl *ctl, unsigned int id, int percent) 279{ 280 if (!ctl || (ctl->info->type != SNDRV_CTL_ELEM_TYPE_INTEGER)) 281 return -EINVAL; 282 283 return mixer_ctl_set_value(ctl, id, percent_to_int(ctl->info, percent)); 284} 285 286int mixer_ctl_get_value(struct mixer_ctl *ctl, unsigned int id) 287{ 288 struct snd_ctl_elem_value ev; 289 int ret; 290 291 if (!ctl || (id >= ctl->info->count)) 292 return -EINVAL; 293 294 memset(&ev, 0, sizeof(ev)); 295 ev.id.numid = ctl->info->id.numid; 296 ret = ioctl(ctl->mixer->fd, SNDRV_CTL_IOCTL_ELEM_READ, &ev); 297 if (ret < 0) 298 return ret; 299 300 switch (ctl->info->type) { 301 case SNDRV_CTL_ELEM_TYPE_BOOLEAN: 302 return !!ev.value.integer.value[id]; 303 304 case SNDRV_CTL_ELEM_TYPE_INTEGER: 305 return ev.value.integer.value[id]; 306 307 case SNDRV_CTL_ELEM_TYPE_ENUMERATED: 308 return ev.value.enumerated.item[id]; 309 310 case SNDRV_CTL_ELEM_TYPE_BYTES: 311 return ev.value.bytes.data[id]; 312 313 default: 314 return -EINVAL; 315 } 316 317 return 0; 318} 319 320int mixer_ctl_set_value(struct mixer_ctl *ctl, unsigned int id, int value) 321{ 322 struct snd_ctl_elem_value ev; 323 int ret; 324 325 if (!ctl || (id >= ctl->info->count)) 326 return -EINVAL; 327 328 memset(&ev, 0, sizeof(ev)); 329 ev.id.numid = ctl->info->id.numid; 330 ret = ioctl(ctl->mixer->fd, SNDRV_CTL_IOCTL_ELEM_READ, &ev); 331 if (ret < 0) 332 return ret; 333 334 switch (ctl->info->type) { 335 case SNDRV_CTL_ELEM_TYPE_BOOLEAN: 336 ev.value.integer.value[id] = !!value; 337 break; 338 339 case SNDRV_CTL_ELEM_TYPE_INTEGER: 340 ev.value.integer.value[id] = value; 341 break; 342 343 case SNDRV_CTL_ELEM_TYPE_ENUMERATED: 344 ev.value.enumerated.item[id] = value; 345 break; 346 347 default: 348 return -EINVAL; 349 } 350 351 return ioctl(ctl->mixer->fd, SNDRV_CTL_IOCTL_ELEM_WRITE, &ev); 352} 353 354int mixer_ctl_get_range_min(struct mixer_ctl *ctl) 355{ 356 int ret; 357 358 if (!ctl || (ctl->info->type != SNDRV_CTL_ELEM_TYPE_INTEGER)) 359 return -EINVAL; 360 361 return ctl->info->value.integer.min; 362} 363 364int mixer_ctl_get_range_max(struct mixer_ctl *ctl) 365{ 366 int ret; 367 368 if (!ctl || (ctl->info->type != SNDRV_CTL_ELEM_TYPE_INTEGER)) 369 return -EINVAL; 370 371 return ctl->info->value.integer.max; 372} 373 374unsigned int mixer_ctl_get_num_enums(struct mixer_ctl *ctl) 375{ 376 if (!ctl) 377 return 0; 378 379 return ctl->info->value.enumerated.items; 380} 381 382const char *mixer_ctl_get_enum_string(struct mixer_ctl *ctl, 383 unsigned int enum_id) 384{ 385 int ret; 386 387 if (!ctl || (ctl->info->type != SNDRV_CTL_ELEM_TYPE_ENUMERATED) || 388 (enum_id >= ctl->info->value.enumerated.items)) 389 return NULL; 390 391 return (const char *)ctl->ename[enum_id]; 392} 393 394int mixer_ctl_set_enum_by_string(struct mixer_ctl *ctl, const char *string) 395{ 396 unsigned int i, num_enums; 397 struct snd_ctl_elem_value ev; 398 int ret; 399 400 if (!ctl || (ctl->info->type != SNDRV_CTL_ELEM_TYPE_ENUMERATED)) 401 return -EINVAL; 402 403 num_enums = ctl->info->value.enumerated.items; 404 for (i = 0; i < num_enums; i++) { 405 if (!strcmp(string, ctl->ename[i])) { 406 memset(&ev, 0, sizeof(ev)); 407 ev.value.enumerated.item[0] = i; 408 ev.id.numid = ctl->info->id.numid; 409 ret = ioctl(ctl->mixer->fd, SNDRV_CTL_IOCTL_ELEM_WRITE, &ev); 410 if (ret < 0) 411 return ret; 412 return 0; 413 } 414 } 415 416 return -EINVAL; 417} 418 419