kernel/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(type);
  40 CODEC_ATTR(vendor_id);
  41 CODEC_ATTR(subsystem_id);
  42 CODEC_ATTR(revision_id);
  43 CODEC_ATTR(afg);
  44 CODEC_ATTR(mfg);
  45 CODEC_ATTR_STR(vendor_name);
  46 CODEC_ATTR_STR(chip_name);
  47
  48 static struct attribute *hdac_dev_attrs[] = {
  49         &dev_attr_type.attr,
  50         &dev_attr_vendor_id.attr,
  51         &dev_attr_subsystem_id.attr,
  52         &dev_attr_revision_id.attr,
  53         &dev_attr_afg.attr,
  54         &dev_attr_mfg.attr,
  55         &dev_attr_vendor_name.attr,
  56         &dev_attr_chip_name.attr,
  57         NULL
  58 };
  59
  60 static struct attribute_group hdac_dev_attr_group = {
  61         .attrs  = hdac_dev_attrs,
  62 };
  63
  64 const struct attribute_group *hdac_dev_attr_groups[] = {
  65         &hdac_dev_attr_group,
  66         NULL
  67 };
  68
  69 /*
  70  * Widget tree sysfs
  71  *
  72  * This is a tree showing the attributes of each widget.  It appears like
  73  * /sys/bus/hdaudioC0D0/widgets/04/caps
  74  */
  75
  76 struct widget_attribute;
  77
  78 struct widget_attribute {
  79         struct attribute        attr;
  80         ssize_t (*show)(struct hdac_device *codec, hda_nid_t nid,
  81                         struct widget_attribute *attr, char *buf);
  82         ssize_t (*store)(struct hdac_device *codec, hda_nid_t nid,
  83                          struct widget_attribute *attr,
  84                          const char *buf, size_t count);
  85 };
  86
  87 static int get_codec_nid(struct kobject *kobj, struct hdac_device **codecp)
  88 {
  89         struct device *dev = kobj_to_dev(kobj->parent->parent);
  90         int nid;
  91         ssize_t ret;
  92
  93         ret = kstrtoint(kobj->name, 16, &nid);
  94         if (ret < 0)
  95                 return ret;
  96         *codecp = dev_to_hdac_dev(dev);
  97         return nid;
  98 }
  99
 100 static ssize_t widget_attr_show(struct kobject *kobj, struct attribute *attr,
 101                                 char *buf)
 102 {
 103         struct widget_attribute *wid_attr =
 104                 container_of(attr, struct widget_attribute, attr);
 105         struct hdac_device *codec;
 106         int nid;
 107
 108         if (!wid_attr->show)
 109                 return -EIO;
 110         nid = get_codec_nid(kobj, &codec);
 111         if (nid < 0)
 112                 return nid;
 113         return wid_attr->show(codec, nid, wid_attr, buf);
 114 }
 115
 116 static ssize_t widget_attr_store(struct kobject *kobj, struct attribute *attr,
 117                                  const char *buf, size_t count)
 118 {
 119         struct widget_attribute *wid_attr =
 120                 container_of(attr, struct widget_attribute, attr);
 121         struct hdac_device *codec;
 122         int nid;
 123
 124         if (!wid_attr->store)
 125                 return -EIO;
 126         nid = get_codec_nid(kobj, &codec);
 127         if (nid < 0)
 128                 return nid;
 129         return wid_attr->store(codec, nid, wid_attr, buf, count);
 130 }
 131
 132 static const struct sysfs_ops widget_sysfs_ops = {
 133         .show   = widget_attr_show,
 134         .store  = widget_attr_store,
 135 };
 136
 137 static void widget_release(struct kobject *kobj)
 138 {
 139         kfree(kobj);
 140 }
 141
 142 static struct kobj_type widget_ktype = {
 143         .release        = widget_release,
 144         .sysfs_ops      = &widget_sysfs_ops,
 145 };
 146
 147 #define WIDGET_ATTR_RO(_name) \
 148         struct widget_attribute wid_attr_##_name = __ATTR_RO(_name)
 149 #define WIDGET_ATTR_RW(_name) \
 150         struct widget_attribute wid_attr_##_name = __ATTR_RW(_name)
 151
 152 static ssize_t caps_show(struct hdac_device *codec, hda_nid_t nid,
 153                         struct widget_attribute *attr, char *buf)
 154 {
 155         return sprintf(buf, "0x%08x\n", get_wcaps(codec, nid));
 156 }
 157
 158 static ssize_t pin_caps_show(struct hdac_device *codec, hda_nid_t nid,
 159                              struct widget_attribute *attr, char *buf)
 160 {
 161         if (get_wcaps_type(get_wcaps(codec, nid)) != AC_WID_PIN)
 162                 return 0;
 163         return sprintf(buf, "0x%08x\n",
 164                        snd_hdac_read_parm(codec, nid, AC_PAR_PIN_CAP));
 165 }
 166
 167 static ssize_t pin_cfg_show(struct hdac_device *codec, hda_nid_t nid,
 168                             struct widget_attribute *attr, char *buf)
 169 {
 170         unsigned int val;
 171
 172         if (get_wcaps_type(get_wcaps(codec, nid)) != AC_WID_PIN)
 173                 return 0;
 174         if (snd_hdac_read(codec, nid, AC_VERB_GET_CONFIG_DEFAULT, 0, &val))
 175                 return 0;
 176         return sprintf(buf, "0x%08x\n", val);
 177 }
 178
 179 static bool has_pcm_cap(struct hdac_device *codec, hda_nid_t nid)
 180 {
 181         if (nid == codec->afg || nid == codec->mfg)
 182                 return true;
 183         switch (get_wcaps_type(get_wcaps(codec, nid))) {
 184         case AC_WID_AUD_OUT:
 185         case AC_WID_AUD_IN:
 186                 return true;
 187         default:
 188                 return false;
 189         }
 190 }
 191
 192 static ssize_t pcm_caps_show(struct hdac_device *codec, hda_nid_t nid,
 193                              struct widget_attribute *attr, char *buf)
 194 {
 195         if (!has_pcm_cap(codec, nid))
 196                 return 0;
 197         return sprintf(buf, "0x%08x\n",
 198                        snd_hdac_read_parm(codec, nid, AC_PAR_PCM));
 199 }
 200
 201 static ssize_t pcm_formats_show(struct hdac_device *codec, hda_nid_t nid,
 202                                 struct widget_attribute *attr, char *buf)
 203 {
 204         if (!has_pcm_cap(codec, nid))
 205                 return 0;
 206         return sprintf(buf, "0x%08x\n",
 207                        snd_hdac_read_parm(codec, nid, AC_PAR_STREAM));
 208 }
 209
 210 static ssize_t amp_in_caps_show(struct hdac_device *codec, hda_nid_t nid,
 211                                 struct widget_attribute *attr, char *buf)
 212 {
 213         if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_IN_AMP))
 214                 return 0;
 215         return sprintf(buf, "0x%08x\n",
 216                        snd_hdac_read_parm(codec, nid, AC_PAR_AMP_IN_CAP));
 217 }
 218
 219 static ssize_t amp_out_caps_show(struct hdac_device *codec, hda_nid_t nid,
 220                                  struct widget_attribute *attr, char *buf)
 221 {
 222         if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_OUT_AMP))
 223                 return 0;
 224         return sprintf(buf, "0x%08x\n",
 225                        snd_hdac_read_parm(codec, nid, AC_PAR_AMP_OUT_CAP));
 226 }
 227
 228 static ssize_t power_caps_show(struct hdac_device *codec, hda_nid_t nid,
 229                                struct widget_attribute *attr, char *buf)
 230 {
 231         if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_POWER))
 232                 return 0;
 233         return sprintf(buf, "0x%08x\n",
 234                        snd_hdac_read_parm(codec, nid, AC_PAR_POWER_STATE));
 235 }
 236
 237 static ssize_t gpio_caps_show(struct hdac_device *codec, hda_nid_t nid,
 238                               struct widget_attribute *attr, char *buf)
 239 {
 240         return sprintf(buf, "0x%08x\n",
 241                        snd_hdac_read_parm(codec, nid, AC_PAR_GPIO_CAP));
 242 }
 243
 244 static ssize_t connections_show(struct hdac_device *codec, hda_nid_t nid,
 245                                 struct widget_attribute *attr, char *buf)
 246 {
 247         hda_nid_t list[32];
 248         int i, nconns;
 249         ssize_t ret = 0;
 250
 251         nconns = snd_hdac_get_connections(codec, nid, list, ARRAY_SIZE(list));
 252         if (nconns <= 0)
 253                 return nconns;
 254         for (i = 0; i < nconns; i++)
 255                 ret += sprintf(buf + ret, "%s0x%02x", i ? " " : "", list[i]);
 256         ret += sprintf(buf + ret, "\n");
 257         return ret;
 258 }
 259
 260 static WIDGET_ATTR_RO(caps);
 261 static WIDGET_ATTR_RO(pin_caps);
 262 static WIDGET_ATTR_RO(pin_cfg);
 263 static WIDGET_ATTR_RO(pcm_caps);
 264 static WIDGET_ATTR_RO(pcm_formats);
 265 static WIDGET_ATTR_RO(amp_in_caps);
 266 static WIDGET_ATTR_RO(amp_out_caps);
 267 static WIDGET_ATTR_RO(power_caps);
 268 static WIDGET_ATTR_RO(gpio_caps);
 269 static WIDGET_ATTR_RO(connections);
 270
 271 static struct attribute *widget_node_attrs[] = {
 272         &wid_attr_caps.attr,
 273         &wid_attr_pin_caps.attr,
 274         &wid_attr_pin_cfg.attr,
 275         &wid_attr_pcm_caps.attr,
 276         &wid_attr_pcm_formats.attr,
 277         &wid_attr_amp_in_caps.attr,
 278         &wid_attr_amp_out_caps.attr,
 279         &wid_attr_power_caps.attr,
 280         &wid_attr_connections.attr,
 281         NULL,
 282 };
 283
 284 static struct attribute *widget_afg_attrs[] = {
 285         &wid_attr_pcm_caps.attr,
 286         &wid_attr_pcm_formats.attr,
 287         &wid_attr_amp_in_caps.attr,
 288         &wid_attr_amp_out_caps.attr,
 289         &wid_attr_power_caps.attr,
 290         &wid_attr_gpio_caps.attr,
 291         NULL,
 292 };
 293
 294 static const struct attribute_group widget_node_group = {
 295         .attrs = widget_node_attrs,
 296 };
 297
 298 static const struct attribute_group widget_afg_group = {
 299         .attrs = widget_afg_attrs,
 300 };
 301
 302 static void free_widget_node(struct kobject *kobj,
 303                              const struct attribute_group *group)
 304 {
 305         if (kobj) {
 306                 sysfs_remove_group(kobj, group);
 307                 kobject_put(kobj);
 308         }
 309 }
 310
 311 static void widget_tree_free(struct hdac_device *codec)
 312 {
 313         struct hdac_widget_tree *tree = codec->widgets;
 314         struct kobject **p;
 315
 316         if (!tree)
 317                 return;
 318         free_widget_node(tree->afg, &widget_afg_group);
 319         if (tree->nodes) {
 320                 for (p = tree->nodes; *p; p++)
 321                         free_widget_node(*p, &widget_node_group);
 322                 kfree(tree->nodes);
 323         }
 324         if (tree->root)
 325                 kobject_put(tree->root);
 326         kfree(tree);
 327         codec->widgets = NULL;
 328 }
 329
 330 static int add_widget_node(struct kobject *parent, hda_nid_t nid,
 331                            const struct attribute_group *group,
 332                            struct kobject **res)
 333 {
 334         struct kobject *kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
 335         int err;
 336
 337         if (!kobj)
 338                 return -ENOMEM;
 339         kobject_init(kobj, &widget_ktype);
 340         err = kobject_add(kobj, parent, "%02x", nid);
 341         if (err < 0)
 342                 return err;
 343         err = sysfs_create_group(kobj, group);
 344         if (err < 0) {
 345                 kobject_put(kobj);
 346                 return err;
 347         }
 348
 349         *res = kobj;
 350         return 0;
 351 }
 352
 353 static int widget_tree_create(struct hdac_device *codec)
 354 {
 355         struct hdac_widget_tree *tree;
 356         int i, err;
 357         hda_nid_t nid;
 358
 359         tree = codec->widgets = kzalloc(sizeof(*tree), GFP_KERNEL);
 360         if (!tree)
 361                 return -ENOMEM;
 362
 363         tree->root = kobject_create_and_add("widgets", &codec->dev.kobj);
 364         if (!tree->root)
 365                 return -ENOMEM;
 366
 367         tree->nodes = kcalloc(codec->num_nodes + 1, sizeof(*tree->nodes),
 368                               GFP_KERNEL);
 369         if (!tree->nodes)
 370                 return -ENOMEM;
 371
 372         for (i = 0, nid = codec->start_nid; i < codec->num_nodes; i++, nid++) {
 373                 err = add_widget_node(tree->root, nid, &widget_node_group,
 374                                       &tree->nodes[i]);
 375                 if (err < 0)
 376                         return err;
 377         }
 378
 379         if (codec->afg) {
 380                 err = add_widget_node(tree->root, codec->afg,
 381                                       &widget_afg_group, &tree->afg);
 382                 if (err < 0)
 383                         return err;
 384         }
 385
 386         kobject_uevent(tree->root, KOBJ_CHANGE);
 387         return 0;
 388 }
 389
 390 int hda_widget_sysfs_init(struct hdac_device *codec)
 391 {
 392         int err;
 393
 394         err = widget_tree_create(codec);
 395         if (err < 0) {
 396                 widget_tree_free(codec);
 397                 return err;
 398         }
 399
 400         return 0;
 401 }
 402
 403 void hda_widget_sysfs_exit(struct hdac_device *codec)
 404 {
 405         widget_tree_free(codec);
 406 }