sound/hda/hdac_sysfs.c

   1 /*
   2  * sysfs support for HD-audio core device
   3  */
   4
   5 #include <linux/slab.h>
   6 #include <linux/sysfs.h>
   7 #include <linux/device.h>
   8 #include <sound/core.h>
   9 #include <sound/hdaudio.h>
  10 #include "local.h"
  11
  12 struct hdac_widget_tree {
  13         struct kobject *root;
  14         struct kobject *afg;
  15         struct kobject **nodes;
  16 };
  17
  18 #define CODEC_ATTR(type)                                        \
  19 static ssize_t type##_show(struct device *dev,                  \
  20                            struct device_attribute *attr,       \
  21                            char *buf)                           \
  22 {                                                               \
  23         struct hdac_device *codec = dev_to_hdac_dev(dev);       \
  24         return sprintf(buf, "0x%x\n", codec->type);             \
  25 } \
  26 static DEVICE_ATTR_RO(type)
  27
  28 #define CODEC_ATTR_STR(type)                                    \
  29 static ssize_t type##_show(struct device *dev,                  \
  30                              struct device_attribute *attr,     \
  31                                         char *buf)              \
  32 {                                                               \
  33         struct hdac_device *codec = dev_to_hdac_dev(dev);       \
  34         return sprintf(buf, "%s\n",                             \
  35                        codec->type ? codec->type : "");         \
  36 } \
  37 static DEVICE_ATTR_RO(type)
  38
  39 CODEC_ATTR(vendor_id);
  40 CODEC_ATTR(subsystem_id);
  41 CODEC_ATTR(revision_id);
  42 CODEC_ATTR(afg);
  43 CODEC_ATTR(mfg);
  44 CODEC_ATTR_STR(vendor_name);
  45 CODEC_ATTR_STR(chip_name);
  46
  47 static struct attribute *hdac_dev_attrs[] = {
  48         &dev_attr_vendor_id.attr,
  49         &dev_attr_subsystem_id.attr,
  50         &dev_attr_revision_id.attr,
  51         &dev_attr_afg.attr,
  52         &dev_attr_mfg.attr,
  53         &dev_attr_vendor_name.attr,
  54         &dev_attr_chip_name.attr,
  55         NULL
  56 };
  57
  58 static struct attribute_group hdac_dev_attr_group = {
  59         .attrs  = hdac_dev_attrs,
  60 };
  61
  62 const struct attribute_group *hdac_dev_attr_groups[] = {
  63         &hdac_dev_attr_group,
  64         NULL
  65 };
  66
  67 /*
  68  * Widget tree sysfs
  69  *
  70  * This is a tree showing the attributes of each widget.  It appears like
  71  * /sys/bus/hdaudioC0D0/widgets/04/caps
  72  */
  73
  74 struct widget_attribute;
  75
  76 struct widget_attribute {
  77         struct attribute        attr;
  78         ssize_t (*show)(struct hdac_device *codec, hda_nid_t nid,
  79                         struct widget_attribute *attr, char *buf);
  80         ssize_t (*store)(struct hdac_device *codec, hda_nid_t nid,
  81                          struct widget_attribute *attr,
  82                          const char *buf, size_t count);
  83 };
  84
  85 static int get_codec_nid(struct kobject *kobj, struct hdac_device **codecp)
  86 {
  87         struct device *dev = kobj_to_dev(kobj->parent->parent);
  88         int nid;
  89         ssize_t ret;
  90
  91         ret = kstrtoint(kobj->name, 16, &nid);
  92         if (ret < 0)
  93                 return ret;
  94         *codecp = dev_to_hdac_dev(dev);
  95         return nid;
  96 }
  97
  98 static ssize_t widget_attr_show(struct kobject *kobj, struct attribute *attr,
  99                                 char *buf)
 100 {
 101         struct widget_attribute *wid_attr =
 102                 container_of(attr, struct widget_attribute, attr);
 103         struct hdac_device *codec;
 104         int nid;
 105
 106         if (!wid_attr->show)
 107                 return -EIO;
 108         nid = get_codec_nid(kobj, &codec);
 109         if (nid < 0)
 110                 return nid;
 111         return wid_attr->show(codec, nid, wid_attr, buf);
 112 }
 113
 114 static ssize_t widget_attr_store(struct kobject *kobj, struct attribute *attr,
 115                                  const char *buf, size_t count)
 116 {
 117         struct widget_attribute *wid_attr =
 118                 container_of(attr, struct widget_attribute, attr);
 119         struct hdac_device *codec;
 120         int nid;
 121
 122         if (!wid_attr->store)
 123                 return -EIO;
 124         nid = get_codec_nid(kobj, &codec);
 125         if (nid < 0)
 126                 return nid;
 127         return wid_attr->store(codec, nid, wid_attr, buf, count);
 128 }
 129
 130 static const struct sysfs_ops widget_sysfs_ops = {
 131         .show   = widget_attr_show,
 132         .store  = widget_attr_store,
 133 };
 134
 135 static void widget_release(struct kobject *kobj)
 136 {
 137         kfree(kobj);
 138 }
 139
 140 static struct kobj_type widget_ktype = {
 141         .release        = widget_release,
 142         .sysfs_ops      = &widget_sysfs_ops,
 143 };
 144
 145 #define WIDGET_ATTR_RO(_name) \
 146         struct widget_attribute wid_attr_##_name = __ATTR_RO(_name)
 147 #define WIDGET_ATTR_RW(_name) \
 148         struct widget_attribute wid_attr_##_name = __ATTR_RW(_name)
 149
 150 static ssize_t caps_show(struct hdac_device *codec, hda_nid_t nid,
 151                         struct widget_attribute *attr, char *buf)
 152 {
 153         return sprintf(buf, "0x%08x\n", get_wcaps(codec, nid));
 154 }
 155
 156 static ssize_t pin_caps_show(struct hdac_device *codec, hda_nid_t nid,
 157                              struct widget_attribute *attr, char *buf)
 158 {
 159         if (get_wcaps_type(get_wcaps(codec, nid)) != AC_WID_PIN)
 160                 return 0;
 161         return sprintf(buf, "0x%08x\n",
 162                        snd_hdac_read_parm(codec, nid, AC_PAR_PIN_CAP));
 163 }
 164
 165 static ssize_t pin_cfg_show(struct hdac_device *codec, hda_nid_t nid,
 166                             struct widget_attribute *attr, char *buf)
 167 {
 168         unsigned int val;
 169
 170         if (get_wcaps_type(get_wcaps(codec, nid)) != AC_WID_PIN)
 171                 return 0;
 172         if (snd_hdac_read(codec, nid, AC_VERB_GET_CONFIG_DEFAULT, 0, &val))
 173                 return 0;
 174         return sprintf(buf, "0x%08x\n", val);
 175 }
 176
 177 static bool has_pcm_cap(struct hdac_device *codec, hda_nid_t nid)
 178 {
 179         if (nid == codec->afg || nid == codec->mfg)
 180                 return true;
 181         switch (get_wcaps_type(get_wcaps(codec, nid))) {
 182         case AC_WID_AUD_OUT:
 183         case AC_WID_AUD_IN:
 184                 return true;
 185         default:
 186                 return false;
 187         }
 188 }
 189
 190 static ssize_t pcm_caps_show(struct hdac_device *codec, hda_nid_t nid,
 191                              struct widget_attribute *attr, char *buf)
 192 {
 193         if (!has_pcm_cap(codec, nid))
 194                 return 0;
 195         return sprintf(buf, "0x%08x\n",
 196                        snd_hdac_read_parm(codec, nid, AC_PAR_PCM));
 197 }
 198
 199 static ssize_t pcm_formats_show(struct hdac_device *codec, hda_nid_t nid,
 200                                 struct widget_attribute *attr, char *buf)
 201 {
 202         if (!has_pcm_cap(codec, nid))
 203                 return 0;
 204         return sprintf(buf, "0x%08x\n",
 205                        snd_hdac_read_parm(codec, nid, AC_PAR_STREAM));
 206 }
 207
 208 static ssize_t amp_in_caps_show(struct hdac_device *codec, hda_nid_t nid,
 209                                 struct widget_attribute *attr, char *buf)
 210 {
 211         if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_IN_AMP))
 212                 return 0;
 213         return sprintf(buf, "0x%08x\n",
 214                        snd_hdac_read_parm(codec, nid, AC_PAR_AMP_IN_CAP));
 215 }
 216
 217 static ssize_t amp_out_caps_show(struct hdac_device *codec, hda_nid_t nid,
 218                                  struct widget_attribute *attr, char *buf)
 219 {
 220         if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_OUT_AMP))
 221                 return 0;
 222         return sprintf(buf, "0x%08x\n",
 223                        snd_hdac_read_parm(codec, nid, AC_PAR_AMP_OUT_CAP));
 224 }
 225
 226 static ssize_t power_caps_show(struct hdac_device *codec, hda_nid_t nid,
 227                                struct widget_attribute *attr, char *buf)
 228 {
 229         if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_POWER))
 230                 return 0;
 231         return sprintf(buf, "0x%08x\n",
 232                        snd_hdac_read_parm(codec, nid, AC_PAR_POWER_STATE));
 233 }
 234
 235 static ssize_t gpio_caps_show(struct hdac_device *codec, hda_nid_t nid,
 236                               struct widget_attribute *attr, char *buf)
 237 {
 238         return sprintf(buf, "0x%08x\n",
 239                        snd_hdac_read_parm(codec, nid, AC_PAR_GPIO_CAP));
 240 }
 241
 242 static ssize_t connections_show(struct hdac_device *codec, hda_nid_t nid,
 243                                 struct widget_attribute *attr, char *buf)
 244 {
 245         hda_nid_t list[32];
 246         int i, nconns;
 247         ssize_t ret = 0;
 248
 249         nconns = snd_hdac_get_connections(codec, nid, list, ARRAY_SIZE(list));
 250         if (nconns <= 0)
 251                 return nconns;
 252         for (i = 0; i < nconns; i++)
 253                 ret += sprintf(buf + ret, "%s0x%02x", i ? " " : "", list[i]);
 254         ret += sprintf(buf + ret, "\n");
 255         return ret;
 256 }
 257
 258 static WIDGET_ATTR_RO(caps);
 259 static WIDGET_ATTR_RO(pin_caps);
 260 static WIDGET_ATTR_RO(pin_cfg);
 261 static WIDGET_ATTR_RO(pcm_caps);
 262 static WIDGET_ATTR_RO(pcm_formats);
 263 static WIDGET_ATTR_RO(amp_in_caps);
 264 static WIDGET_ATTR_RO(amp_out_caps);
 265 static WIDGET_ATTR_RO(power_caps);
 266 static WIDGET_ATTR_RO(gpio_caps);
 267 static WIDGET_ATTR_RO(connections);
 268
 269 static struct attribute *widget_node_attrs[] = {
 270         &wid_attr_caps.attr,
 271         &wid_attr_pin_caps.attr,
 272         &wid_attr_pin_cfg.attr,
 273         &wid_attr_pcm_caps.attr,
 274         &wid_attr_pcm_formats.attr,
 275         &wid_attr_amp_in_caps.attr,
 276         &wid_attr_amp_out_caps.attr,
 277         &wid_attr_power_caps.attr,
 278         &wid_attr_connections.attr,
 279         NULL,
 280 };
 281
 282 static struct attribute *widget_afg_attrs[] = {
 283         &wid_attr_pcm_caps.attr,
 284         &wid_attr_pcm_formats.attr,
 285         &wid_attr_amp_in_caps.attr,
 286         &wid_attr_amp_out_caps.attr,
 287         &wid_attr_power_caps.attr,
 288         &wid_attr_gpio_caps.attr,
 289         NULL,
 290 };
 291
 292 static const struct attribute_group widget_node_group = {
 293         .attrs = widget_node_attrs,
 294 };
 295
 296 static const struct attribute_group widget_afg_group = {
 297         .attrs = widget_afg_attrs,
 298 };
 299
 300 static void free_widget_node(struct kobject *kobj,
 301                              const struct attribute_group *group)
 302 {
 303         if (kobj) {
 304                 sysfs_remove_group(kobj, group);
 305                 kobject_put(kobj);
 306         }
 307 }
 308
 309 static void widget_tree_free(struct hdac_device *codec)
 310 {
 311         struct hdac_widget_tree *tree = codec->widgets;
 312         struct kobject **p;
 313
 314         if (!tree)
 315                 return;
 316         if (tree->nodes) {
 317                 for (p = tree->nodes; *p; p++)
 318                         free_widget_node(*p, &widget_node_group);
 319                 kfree(tree->nodes);
 320         }
 321         free_widget_node(tree->afg, &widget_afg_group);
 322         if (tree->root)
 323                 kobject_put(tree->root);
 324         kfree(tree);
 325         codec->widgets = NULL;
 326 }
 327
 328 static int add_widget_node(struct kobject *parent, hda_nid_t nid,
 329                            const struct attribute_group *group,
 330                            struct kobject **res)
 331 {
 332         struct kobject *kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
 333         int err;
 334
 335         if (!kobj)
 336                 return -ENOMEM;
 337         kobject_init(kobj, &widget_ktype);
 338         err = kobject_add(kobj, parent, "%02x", nid);
 339         if (err < 0)
 340                 return err;
 341         err = sysfs_create_group(kobj, group);
 342         if (err < 0) {
 343                 kobject_put(kobj);
 344                 return err;
 345         }
 346
 347         *res = kobj;
 348         return 0;
 349 }
 350
 351 static int widget_tree_create(struct hdac_device *codec)
 352 {
 353         struct hdac_widget_tree *tree;
 354         int i, err;
 355         hda_nid_t nid;
 356
 357         tree = codec->widgets = kzalloc(sizeof(*tree), GFP_KERNEL);
 358         if (!tree)
 359                 return -ENOMEM;
 360
 361         tree->root = kobject_create_and_add("widgets", &codec->dev.kobj);
 362         if (!tree->root)
 363                 return -ENOMEM;
 364
 365         if (codec->afg) {
 366                 err = add_widget_node(tree->root, codec->afg,
 367                                       &widget_afg_group, &tree->afg);
 368                 if (err < 0)
 369                         return err;
 370         }
 371
 372         tree->nodes = kcalloc(codec->num_nodes + 1, sizeof(*tree->nodes),
 373                               GFP_KERNEL);
 374         if (!tree->nodes)
 375                 return -ENOMEM;
 376
 377         for (i = 0, nid = codec->start_nid; i < codec->num_nodes; i++, nid++) {
 378                 err = add_widget_node(tree->root, nid, &widget_node_group,
 379                                       &tree->nodes[i]);
 380                 if (err < 0)
 381                         return err;
 382         }
 383
 384         kobject_uevent(tree->root, KOBJ_CHANGE);
 385         return 0;
 386 }
 387
 388 int hda_widget_sysfs_init(struct hdac_device *codec)
 389 {
 390         int err;
 391
 392         err = widget_tree_create(codec);
 393         if (err < 0) {
 394                 widget_tree_free(codec);
 395                 return err;
 396         }
 397
 398         return 0;
 399 }
 400
 401 void hda_widget_sysfs_exit(struct hdac_device *codec)
 402 {
 403         widget_tree_free(codec);
 404 }