src/modules/udev-util.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2009 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as
   8   published by the Free Software Foundation; either version 2.1 of the
   9   License, or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <libudev.h>
  27
  28 #include <pulse/xmalloc.h>
  29 #include <pulse/proplist.h>
  30
  31 #include <pulsecore/log.h>
  32 #include <pulsecore/core-util.h>
  33
  34 #include "udev-util.h"
  35
  36 static int read_id(struct udev_device *d, const char *n) {
  37     const char *v;
  38     unsigned u;
  39
  40     pa_assert(d);
  41     pa_assert(n);
  42
  43     if (!(v = udev_device_get_property_value(d, n)))
  44         return -1;
  45
  46     if (pa_startswith(v, "0x"))
  47         v += 2;
  48
  49     if (!*v)
  50         return -1;
  51
  52     if (sscanf(v, "%04x", &u) != 1)
  53         return -1;
  54
  55     if (u > 0xFFFFU)
  56         return -1;
  57
  58     return u;
  59 }
  60
  61 static int dehex(char x) {
  62     if (x >= '0' && x <= '9')
  63         return x - '0';
  64
  65     if (x >= 'A' && x <= 'F')
  66         return x - 'A' + 10;
  67
  68     if (x >= 'a' && x <= 'f')
  69         return x - 'a' + 10;
  70
  71     return -1;
  72 }
  73
  74 static void proplist_sets_unescape(pa_proplist *p, const char *prop, const char *s) {
  75     const char *f;
  76     char *t, *r;
  77     int c = 0;
  78
  79     enum {
  80         TEXT,
  81         BACKSLASH,
  82         EX,
  83         FIRST
  84     } state = TEXT;
  85
  86     /* The resulting string is definitely shorter than the source string */
  87     r = pa_xnew(char, strlen(s)+1);
  88
  89     for (f = s, t = r; *f; f++) {
  90
  91         switch (state) {
  92
  93             case TEXT:
  94                 if (*f == '\\')
  95                     state = BACKSLASH;
  96                 else
  97                     *(t++) = *f;
  98                 break;
  99
 100             case BACKSLASH:
 101                 if (*f == 'x')
 102                     state = EX;
 103                 else {
 104                     *(t++) = '\\';
 105                     *(t++) = *f;
 106                     state = TEXT;
 107                 }
 108                 break;
 109
 110             case EX:
 111                 c = dehex(*f);
 112
 113                 if (c < 0) {
 114                     *(t++) = '\\';
 115                     *(t++) = 'x';
 116                     *(t++) = *f;
 117                     state = TEXT;
 118                 } else
 119                     state = FIRST;
 120
 121                 break;
 122
 123             case FIRST: {
 124                 int d = dehex(*f);
 125
 126                 if (d < 0) {
 127                     *(t++) = '\\';
 128                     *(t++) = 'x';
 129                     *(t++) = *(f-1);
 130                     *(t++) = *f;
 131                 } else
 132                     *(t++) = (char) (c << 4) | d;
 133
 134                 state = TEXT;
 135                 break;
 136             }
 137         }
 138     }
 139
 140     switch (state) {
 141
 142         case TEXT:
 143             break;
 144
 145         case BACKSLASH:
 146             *(t++) = '\\';
 147             break;
 148
 149         case EX:
 150             *(t++) = '\\';
 151             *(t++) = 'x';
 152             break;
 153
 154         case FIRST:
 155             *(t++) = '\\';
 156             *(t++) = 'x';
 157             *(t++) = *(f-1);
 158             break;
 159     }
 160
 161     *t = 0;
 162
 163     pa_proplist_sets(p, prop, r);
 164     pa_xfree(r);
 165 }
 166
 167 int pa_udev_get_info(int card_idx, pa_proplist *p) {
 168     int r = -1;
 169     struct udev *udev;
 170     struct udev_device *card = NULL;
 171     char *t;
 172     const char *v;
 173     int id;
 174
 175     pa_assert(p);
 176     pa_assert(card_idx >= 0);
 177
 178     if (!(udev = udev_new())) {
 179         pa_log_error("Failed to allocate udev context.");
 180         goto finish;
 181     }
 182
 183     t = pa_sprintf_malloc("%s/class/sound/card%i", udev_get_sys_path(udev), card_idx);
 184     card = udev_device_new_from_syspath(udev, t);
 185     pa_xfree(t);
 186
 187     if (!card) {
 188         pa_log_error("Failed to get card object.");
 189         goto finish;
 190     }
 191
 192     if (!pa_proplist_contains(p, PA_PROP_DEVICE_BUS_PATH))
 193         if (((v = udev_device_get_property_value(card, "ID_PATH")) && *v) ||
 194             (v = udev_device_get_devpath(card)))
 195             pa_proplist_sets(p, PA_PROP_DEVICE_BUS_PATH, v);
 196
 197     if (!pa_proplist_contains(p, "sysfs.path"))
 198         if ((v = udev_device_get_devpath(card)))
 199             pa_proplist_sets(p, "sysfs.path", v);
 200
 201     if (!pa_proplist_contains(p, "udev.id"))
 202         if ((v = udev_device_get_property_value(card, "ID_ID")) && *v)
 203             pa_proplist_sets(p, "udev.id", v);
 204
 205     if (!pa_proplist_contains(p, PA_PROP_DEVICE_BUS))
 206         if ((v = udev_device_get_property_value(card, "ID_BUS")) && *v)
 207             pa_proplist_sets(p, PA_PROP_DEVICE_BUS, v);
 208
 209     if (!pa_proplist_contains(p, PA_PROP_DEVICE_VENDOR_ID))
 210         if ((id = read_id(card, "ID_VENDOR_ID")) > 0)
 211             pa_proplist_setf(p, PA_PROP_DEVICE_VENDOR_ID, "%04x", id);
 212
 213     if (!pa_proplist_contains(p, PA_PROP_DEVICE_VENDOR_NAME)) {
 214         if ((v = udev_device_get_property_value(card, "ID_VENDOR_FROM_DATABASE")) && *v)
 215             pa_proplist_sets(p, PA_PROP_DEVICE_VENDOR_NAME, v);
 216         else if ((v = udev_device_get_property_value(card, "ID_VENDOR_ENC")) && *v)
 217             proplist_sets_unescape(p, PA_PROP_DEVICE_VENDOR_NAME, v);
 218         else if ((v = udev_device_get_property_value(card, "ID_VENDOR")) && *v)
 219             pa_proplist_sets(p, PA_PROP_DEVICE_VENDOR_NAME, v);
 220     }
 221
 222     if (!pa_proplist_contains(p, PA_PROP_DEVICE_PRODUCT_ID))
 223         if ((id = read_id(card, "ID_MODEL_ID")) >= 0)
 224             pa_proplist_setf(p, PA_PROP_DEVICE_PRODUCT_ID, "%04x", id);
 225
 226     if (!pa_proplist_contains(p, PA_PROP_DEVICE_PRODUCT_NAME)) {
 227         if ((v = udev_device_get_property_value(card, "ID_MODEL_FROM_DATABASE")) && *v)
 228             pa_proplist_sets(p, PA_PROP_DEVICE_PRODUCT_NAME, v);
 229         else if ((v = udev_device_get_property_value(card, "ID_MODEL_ENC")) && *v)
 230             proplist_sets_unescape(p, PA_PROP_DEVICE_PRODUCT_NAME, v);
 231         else if ((v = udev_device_get_property_value(card, "ID_MODEL")) && *v)
 232             pa_proplist_sets(p, PA_PROP_DEVICE_PRODUCT_NAME, v);
 233     }
 234
 235     if (!pa_proplist_contains(p, PA_PROP_DEVICE_SERIAL))
 236         if ((v = udev_device_get_property_value(card, "ID_SERIAL")) && *v)
 237             pa_proplist_sets(p, PA_PROP_DEVICE_SERIAL, v);
 238
 239     if (!pa_proplist_contains(p, PA_PROP_DEVICE_CLASS))
 240         if ((v = udev_device_get_property_value(card, "SOUND_CLASS")) && *v)
 241             pa_proplist_sets(p, PA_PROP_DEVICE_CLASS, v);
 242
 243     if (!pa_proplist_contains(p, PA_PROP_DEVICE_FORM_FACTOR))
 244         if ((v = udev_device_get_property_value(card, "SOUND_FORM_FACTOR")) && *v)
 245             pa_proplist_sets(p, PA_PROP_DEVICE_FORM_FACTOR, v);
 246
 247     /* This is normaly not set by the udev rules but may be useful to
 248      * allow administrators to overwrite the device description.*/
 249     if (!pa_proplist_contains(p, PA_PROP_DEVICE_DESCRIPTION))
 250         if ((v = udev_device_get_property_value(card, "SOUND_DESCRIPTION")) && *v)
 251             pa_proplist_sets(p, PA_PROP_DEVICE_DESCRIPTION, v);
 252
 253     r = 0;
 254
 255 finish:
 256
 257     if (card)
 258         udev_device_unref(card);
 259
 260     if (udev)
 261         udev_unref(udev);
 262
 263     return r;
 264 }
 265
 266 char* pa_udev_get_property(int card_idx, const char *name) {
 267     struct udev *udev;
 268     struct udev_device *card = NULL;
 269     char *t, *r = NULL;
 270     const char *v;
 271
 272     pa_assert(card_idx >= 0);
 273     pa_assert(name);
 274
 275     if (!(udev = udev_new())) {
 276         pa_log_error("Failed to allocate udev context.");
 277         goto finish;
 278     }
 279
 280     t = pa_sprintf_malloc("%s/class/sound/card%i", udev_get_sys_path(udev), card_idx);
 281     card = udev_device_new_from_syspath(udev, t);
 282     pa_xfree(t);
 283
 284     if (!card) {
 285         pa_log_error("Failed to get card object.");
 286         goto finish;
 287     }
 288
 289     if ((v = udev_device_get_property_value(card, name)) && *v)
 290         r = pa_xstrdup(v);
 291
 292 finish:
 293
 294     if (card)
 295         udev_device_unref(card);
 296
 297     if (udev)
 298         udev_unref(udev);
 299
 300     return r;
 301 }