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 ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
  49                              char *buf)
  50 {
  51         return snd_hdac_codec_modalias(dev_to_hdac_dev(dev), buf, 256);
  52 }
  53 static DEVICE_ATTR_RO(modalias);
  54
  55 static struct attribute *hdac_dev_attrs[] = {
  56         &dev_attr_type.attr,
  57         &dev_attr_vendor_id.attr,
  58         &dev_attr_subsystem_id.attr,
  59         &dev_attr_revision_id.attr,
  60         &dev_attr_afg.attr,
  61         &dev_attr_mfg.attr,
  62         &dev_attr_vendor_name.attr,
  63         &dev_attr_chip_name.attr,
  64         &dev_attr_modalias.attr,
  65         NULL
  66 };
  67
  68 static struct attribute_group hdac_dev_attr_group = {
  69         .attrs  = hdac_dev_attrs,
  70 };
  71
  72 const struct attribute_group *hdac_dev_attr_groups[] = {
  73         &hdac_dev_attr_group,
  74         NULL
  75 };
  76
  77 /*
  78  * Widget tree sysfs
  79  *
  80  * This is a tree showing the attributes of each widget.  It appears like
  81  * /sys/bus/hdaudioC0D0/widgets/04/caps
  82  */
  83
  84 struct widget_attribute;
  85
  86 struct widget_attribute {
  87         struct attribute        attr;
  88         ssize_t (*show)(struct hdac_device *codec, hda_nid_t nid,
  89                         struct widget_attribute *attr, char *buf);
  90         ssize_t (*store)(struct hdac_device *codec, hda_nid_t nid,
  91                          struct widget_attribute *attr,
  92                          const char *buf, size_t count);
  93 };
  94
  95 static int get_codec_nid(struct kobject *kobj, struct hdac_device **codecp)
  96 {
  97         struct device *dev = kobj_to_dev(kobj->parent->parent);
  98         int nid;
  99         ssize_t ret;
 100
 101         ret = kstrtoint(kobj->name, 16, &nid);
 102         if (ret < 0)
 103                 return ret;
 104         *codecp = dev_to_hdac_dev(dev);
 105         return nid;
 106 }
 107
 108 static ssize_t widget_attr_show(struct kobject *kobj, struct attribute *attr,
 109                                 char *buf)
 110 {
 111         struct widget_attribute *wid_attr =
 112                 container_of(attr, struct widget_attribute, attr);
 113         struct hdac_device *codec;
 114         int nid;
 115
 116         if (!wid_attr->show)
 117                 return -EIO;
 118         nid = get_codec_nid(kobj, &codec);
 119         if (nid < 0)
 120                 return nid;
 121         return wid_attr->show(codec, nid, wid_attr, buf);
 122 }
 123
 124 static ssize_t widget_attr_store(struct kobject *kobj, struct attribute *attr,
 125                                  const char *buf, size_t count)
 126 {
 127         struct widget_attribute *wid_attr =
 128                 container_of(attr, struct widget_attribute, attr);
 129         struct hdac_device *codec;
 130         int nid;
 131
 132         if (!wid_attr->store)
 133                 return -EIO;
 134         nid = get_codec_nid(kobj, &codec);
 135         if (nid < 0)
 136                 return nid;
 137         return wid_attr->store(codec, nid, wid_attr, buf, count);
 138 }
 139
 140 static const struct sysfs_ops widget_sysfs_ops = {
 141         .show   = widget_attr_show,
 142         .store  = widget_attr_store,
 143 };
 144
 145 static void widget_release(struct kobject *kobj)
 146 {
 147         kfree(kobj);
 148 }
 149
 150 static struct kobj_type widget_ktype = {
 151         .release        = widget_release,
 152         .sysfs_ops      = &widget_sysfs_ops,
 153 };
 154
 155 #define WIDGET_ATTR_RO(_name) \
 156         struct widget_attribute wid_attr_##_name = __ATTR_RO(_name)
 157 #define WIDGET_ATTR_RW(_name) \
 158         struct widget_attribute wid_attr_##_name = __ATTR_RW(_name)
 159
 160 static ssize_t caps_show(struct hdac_device *codec, hda_nid_t nid,
 161                         struct widget_attribute *attr, char *buf)
 162 {
 163         return sprintf(buf, "0x%08x\n", get_wcaps(codec, nid));
 164 }
 165
 166 static ssize_t pin_caps_show(struct hdac_device *codec, hda_nid_t nid,
 167                              struct widget_attribute *attr, char *buf)
 168 {
 169         if (get_wcaps_type(get_wcaps(codec, nid)) != AC_WID_PIN)
 170                 return 0;
 171         return sprintf(buf, "0x%08x\n",
 172                        snd_hdac_read_parm(codec, nid, AC_PAR_PIN_CAP));
 173 }
 174
 175 static ssize_t pin_cfg_show(struct hdac_device *codec, hda_nid_t nid,
 176                             struct widget_attribute *attr, char *buf)
 177 {
 178         unsigned int val;
 179
 180         if (get_wcaps_type(get_wcaps(codec, nid)) != AC_WID_PIN)
 181                 return 0;
 182         if (snd_hdac_read(codec, nid, AC_VERB_GET_CONFIG_DEFAULT, 0, &val))
 183                 return 0;
 184         return sprintf(buf, "0x%08x\n", val);
 185 }
 186
 187 static bool has_pcm_cap(struct hdac_device *codec, hda_nid_t nid)
 188 {
 189         if (nid == codec->afg || nid == codec->mfg)
 190                 return true;
 191         switch (get_wcaps_type(get_wcaps(codec, nid))) {
 192         case AC_WID_AUD_OUT:
 193         case AC_WID_AUD_IN:
 194                 return true;
 195         default:
 196                 return false;
 197         }
 198 }
 199
 200 static ssize_t pcm_caps_show(struct hdac_device *codec, hda_nid_t nid,
 201                              struct widget_attribute *attr, char *buf)
 202 {
 203         if (!has_pcm_cap(codec, nid))
 204                 return 0;
 205         return sprintf(buf, "0x%08x\n",
 206                        snd_hdac_read_parm(codec, nid, AC_PAR_PCM));
 207 }
 208
 209 static ssize_t pcm_formats_show(struct hdac_device *codec, hda_nid_t nid,
 210                                 struct widget_attribute *attr, char *buf)
 211 {
 212         if (!has_pcm_cap(codec, nid))
 213                 return 0;
 214         return sprintf(buf, "0x%08x\n",
 215                        snd_hdac_read_parm(codec, nid, AC_PAR_STREAM));
 216 }
 217
 218 static ssize_t amp_in_caps_show(struct hdac_device *codec, hda_nid_t nid,
 219                                 struct widget_attribute *attr, char *buf)
 220 {
 221         if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_IN_AMP))
 222                 return 0;
 223         return sprintf(buf, "0x%08x\n",
 224                        snd_hdac_read_parm(codec, nid, AC_PAR_AMP_IN_CAP));
 225 }
 226
 227 static ssize_t amp_out_caps_show(struct hdac_device *codec, hda_nid_t nid,
 228                                  struct widget_attribute *attr, char *buf)
 229 {
 230         if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_OUT_AMP))
 231                 return 0;
 232         return sprintf(buf, "0x%08x\n",
 233                        snd_hdac_read_parm(codec, nid, AC_PAR_AMP_OUT_CAP));
 234 }
 235
 236 static ssize_t power_caps_show(struct hdac_device *codec, hda_nid_t nid,
 237                                struct widget_attribute *attr, char *buf)
 238 {
 239         if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_POWER))
 240                 return 0;
 241         return sprintf(buf, "0x%08x\n",
 242                        snd_hdac_read_parm(codec, nid, AC_PAR_POWER_STATE));
 243 }
 244
 245 static ssize_t gpio_caps_show(struct hdac_device *codec, hda_nid_t nid,
 246                               struct widget_attribute *attr, char *buf)
 247 {
 248         return sprintf(buf, "0x%08x\n",
 249                        snd_hdac_read_parm(codec, nid, AC_PAR_GPIO_CAP));
 250 }
 251
 252 static ssize_t connections_show(struct hdac_device *codec, hda_nid_t nid,
 253                                 struct widget_attribute *attr, char *buf)
 254 {
 255         hda_nid_t list[32];
 256         int i, nconns;
 257         ssize_t ret = 0;
 258
 259         nconns = snd_hdac_get_connections(codec, nid, list, ARRAY_SIZE(list));
 260         if (nconns <= 0)
 261                 return nconns;
 262         for (i = 0; i < nconns; i++)
 263                 ret += sprintf(buf + ret, "%s0x%02x", i ? " " : "", list[i]);
 264         ret += sprintf(buf + ret, "\n");
 265         return ret;
 266 }
 267
 268 static WIDGET_ATTR_RO(caps);
 269 static WIDGET_ATTR_RO(pin_caps);
 270 static WIDGET_ATTR_RO(pin_cfg);
 271 static WIDGET_ATTR_RO(pcm_caps);
 272 static WIDGET_ATTR_RO(pcm_formats);
 273 static WIDGET_ATTR_RO(amp_in_caps);
 274 static WIDGET_ATTR_RO(amp_out_caps);
 275 static WIDGET_ATTR_RO(power_caps);
 276 static WIDGET_ATTR_RO(gpio_caps);
 277 static WIDGET_ATTR_RO(connections);
 278
 279 static struct attribute *widget_node_attrs[] = {
 280         &wid_attr_caps.attr,
 281         &wid_attr_pin_caps.attr,
 282         &wid_attr_pin_cfg.attr,
 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_connections.attr,
 289         NULL,
 290 };
 291
 292 static struct attribute *widget_afg_attrs[] = {
 293         &wid_attr_pcm_caps.attr,
 294         &wid_attr_pcm_formats.attr,
 295         &wid_attr_amp_in_caps.attr,
 296         &wid_attr_amp_out_caps.attr,
 297         &wid_attr_power_caps.attr,
 298         &wid_attr_gpio_caps.attr,
 299         NULL,
 300 };
 301
 302 static const struct attribute_group widget_node_group = {
 303         .attrs = widget_node_attrs,
 304 };
 305
 306 static const struct attribute_group widget_afg_group = {
 307         .attrs = widget_afg_attrs,
 308 };
 309
 310 static void free_widget_node(struct kobject *kobj,
 311                              const struct attribute_group *group)
 312 {
 313         if (kobj) {
 314                 sysfs_remove_group(kobj, group);
 315                 kobject_put(kobj);
 316         }
 317 }
 318
 319 static void widget_tree_free(struct hdac_device *codec)
 320 {
 321         struct hdac_widget_tree *tree = codec->widgets;
 322         struct kobject **p;
 323
 324         if (!tree)
 325                 return;
 326         free_widget_node(tree->afg, &widget_afg_group);
 327         if (tree->nodes) {
 328                 for (p = tree->nodes; *p; p++)
 329                         free_widget_node(*p, &widget_node_group);
 330                 kfree(tree->nodes);
 331         }
 332         kobject_put(tree->root);
 333         kfree(tree);
 334         codec->widgets = NULL;
 335 }
 336
 337 static int add_widget_node(struct kobject *parent, hda_nid_t nid,
 338                            const struct attribute_group *group,
 339                            struct kobject **res)
 340 {
 341         struct kobject *kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
 342         int err;
 343
 344         if (!kobj)
 345                 return -ENOMEM;
 346         kobject_init(kobj, &widget_ktype);
 347         err = kobject_add(kobj, parent, "%02x", nid);
 348         if (err < 0)
 349                 return err;
 350         err = sysfs_create_group(kobj, group);
 351         if (err < 0) {
 352                 kobject_put(kobj);
 353                 return err;
 354         }
 355
 356         *res = kobj;
 357         return 0;
 358 }
 359
 360 static int widget_tree_create(struct hdac_device *codec)
 361 {
 362         struct hdac_widget_tree *tree;
 363         int i, err;
 364         hda_nid_t nid;
 365
 366         tree = codec->widgets = kzalloc(sizeof(*tree), GFP_KERNEL);
 367         if (!tree)
 368                 return -ENOMEM;
 369
 370         tree->root = kobject_create_and_add("widgets", &codec->dev.kobj);
 371         if (!tree->root)
 372                 return -ENOMEM;
 373
 374         tree->nodes = kcalloc(codec->num_nodes + 1, sizeof(*tree->nodes),
 375                               GFP_KERNEL);
 376         if (!tree->nodes)
 377                 return -ENOMEM;
 378
 379         for (i = 0, nid = codec->start_nid; i < codec->num_nodes; i++, nid++) {
 380                 err = add_widget_node(tree->root, nid, &widget_node_group,
 381                                       &tree->nodes[i]);
 382                 if (err < 0)
 383                         return err;
 384         }
 385
 386         if (codec->afg) {
 387                 err = add_widget_node(tree->root, codec->afg,
 388                                       &widget_afg_group, &tree->afg);
 389                 if (err < 0)
 390                         return err;
 391         }
 392
 393         kobject_uevent(tree->root, KOBJ_CHANGE);
 394         return 0;
 395 }
 396
 397 int hda_widget_sysfs_init(struct hdac_device *codec)
 398 {
 399         int err;
 400
 401         if (codec->widgets)
 402                 return 0; /* already created */
 403
 404         err = widget_tree_create(codec);
 405         if (err < 0) {
 406                 widget_tree_free(codec);
 407                 return err;
 408         }
 409
 410         return 0;
 411 }
 412
 413 void hda_widget_sysfs_exit(struct hdac_device *codec)
 414 {
 415         widget_tree_free(codec);
 416 }