hdac_sysfs.c 11.1 KB
Newer Older
1
// SPDX-License-Identifier: GPL-2.0
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
/*
 * sysfs support for HD-audio core device
 */

#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/hdaudio.h>
#include "local.h"

struct hdac_widget_tree {
	struct kobject *root;
	struct kobject *afg;
	struct kobject **nodes;
};

#define CODEC_ATTR(type)					\
static ssize_t type##_show(struct device *dev,			\
			   struct device_attribute *attr,	\
			   char *buf)				\
{								\
	struct hdac_device *codec = dev_to_hdac_dev(dev);	\
	return sprintf(buf, "0x%x\n", codec->type);		\
} \
static DEVICE_ATTR_RO(type)

#define CODEC_ATTR_STR(type)					\
static ssize_t type##_show(struct device *dev,			\
			     struct device_attribute *attr,	\
					char *buf)		\
{								\
	struct hdac_device *codec = dev_to_hdac_dev(dev);	\
	return sprintf(buf, "%s\n",				\
		       codec->type ? codec->type : "");		\
} \
static DEVICE_ATTR_RO(type)

40
CODEC_ATTR(type);
41 42 43 44 45 46 47 48
CODEC_ATTR(vendor_id);
CODEC_ATTR(subsystem_id);
CODEC_ATTR(revision_id);
CODEC_ATTR(afg);
CODEC_ATTR(mfg);
CODEC_ATTR_STR(vendor_name);
CODEC_ATTR_STR(chip_name);

49 50 51 52 53 54 55
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	return snd_hdac_codec_modalias(dev_to_hdac_dev(dev), buf, 256);
}
static DEVICE_ATTR_RO(modalias);

56
static struct attribute *hdac_dev_attrs[] = {
57
	&dev_attr_type.attr,
58 59 60 61 62 63 64
	&dev_attr_vendor_id.attr,
	&dev_attr_subsystem_id.attr,
	&dev_attr_revision_id.attr,
	&dev_attr_afg.attr,
	&dev_attr_mfg.attr,
	&dev_attr_vendor_name.attr,
	&dev_attr_chip_name.attr,
65
	&dev_attr_modalias.attr,
66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326
	NULL
};

static struct attribute_group hdac_dev_attr_group = {
	.attrs	= hdac_dev_attrs,
};

const struct attribute_group *hdac_dev_attr_groups[] = {
	&hdac_dev_attr_group,
	NULL
};

/*
 * Widget tree sysfs
 *
 * This is a tree showing the attributes of each widget.  It appears like
 * /sys/bus/hdaudioC0D0/widgets/04/caps
 */

struct widget_attribute;

struct widget_attribute {
	struct attribute	attr;
	ssize_t (*show)(struct hdac_device *codec, hda_nid_t nid,
			struct widget_attribute *attr, char *buf);
	ssize_t (*store)(struct hdac_device *codec, hda_nid_t nid,
			 struct widget_attribute *attr,
			 const char *buf, size_t count);
};

static int get_codec_nid(struct kobject *kobj, struct hdac_device **codecp)
{
	struct device *dev = kobj_to_dev(kobj->parent->parent);
	int nid;
	ssize_t ret;

	ret = kstrtoint(kobj->name, 16, &nid);
	if (ret < 0)
		return ret;
	*codecp = dev_to_hdac_dev(dev);
	return nid;
}

static ssize_t widget_attr_show(struct kobject *kobj, struct attribute *attr,
				char *buf)
{
	struct widget_attribute *wid_attr =
		container_of(attr, struct widget_attribute, attr);
	struct hdac_device *codec;
	int nid;

	if (!wid_attr->show)
		return -EIO;
	nid = get_codec_nid(kobj, &codec);
	if (nid < 0)
		return nid;
	return wid_attr->show(codec, nid, wid_attr, buf);
}

static ssize_t widget_attr_store(struct kobject *kobj, struct attribute *attr,
				 const char *buf, size_t count)
{
	struct widget_attribute *wid_attr =
		container_of(attr, struct widget_attribute, attr);
	struct hdac_device *codec;
	int nid;

	if (!wid_attr->store)
		return -EIO;
	nid = get_codec_nid(kobj, &codec);
	if (nid < 0)
		return nid;
	return wid_attr->store(codec, nid, wid_attr, buf, count);
}

static const struct sysfs_ops widget_sysfs_ops = {
	.show	= widget_attr_show,
	.store	= widget_attr_store,
};

static void widget_release(struct kobject *kobj)
{
	kfree(kobj);
}

static struct kobj_type widget_ktype = {
	.release	= widget_release,
	.sysfs_ops	= &widget_sysfs_ops,
};

#define WIDGET_ATTR_RO(_name) \
	struct widget_attribute wid_attr_##_name = __ATTR_RO(_name)
#define WIDGET_ATTR_RW(_name) \
	struct widget_attribute wid_attr_##_name = __ATTR_RW(_name)

static ssize_t caps_show(struct hdac_device *codec, hda_nid_t nid,
			struct widget_attribute *attr, char *buf)
{
	return sprintf(buf, "0x%08x\n", get_wcaps(codec, nid));
}

static ssize_t pin_caps_show(struct hdac_device *codec, hda_nid_t nid,
			     struct widget_attribute *attr, char *buf)
{
	if (get_wcaps_type(get_wcaps(codec, nid)) != AC_WID_PIN)
		return 0;
	return sprintf(buf, "0x%08x\n",
		       snd_hdac_read_parm(codec, nid, AC_PAR_PIN_CAP));
}

static ssize_t pin_cfg_show(struct hdac_device *codec, hda_nid_t nid,
			    struct widget_attribute *attr, char *buf)
{
	unsigned int val;

	if (get_wcaps_type(get_wcaps(codec, nid)) != AC_WID_PIN)
		return 0;
	if (snd_hdac_read(codec, nid, AC_VERB_GET_CONFIG_DEFAULT, 0, &val))
		return 0;
	return sprintf(buf, "0x%08x\n", val);
}

static bool has_pcm_cap(struct hdac_device *codec, hda_nid_t nid)
{
	if (nid == codec->afg || nid == codec->mfg)
		return true;
	switch (get_wcaps_type(get_wcaps(codec, nid))) {
	case AC_WID_AUD_OUT:
	case AC_WID_AUD_IN:
		return true;
	default:
		return false;
	}
}

static ssize_t pcm_caps_show(struct hdac_device *codec, hda_nid_t nid,
			     struct widget_attribute *attr, char *buf)
{
	if (!has_pcm_cap(codec, nid))
		return 0;
	return sprintf(buf, "0x%08x\n",
		       snd_hdac_read_parm(codec, nid, AC_PAR_PCM));
}

static ssize_t pcm_formats_show(struct hdac_device *codec, hda_nid_t nid,
				struct widget_attribute *attr, char *buf)
{
	if (!has_pcm_cap(codec, nid))
		return 0;
	return sprintf(buf, "0x%08x\n",
		       snd_hdac_read_parm(codec, nid, AC_PAR_STREAM));
}

static ssize_t amp_in_caps_show(struct hdac_device *codec, hda_nid_t nid,
				struct widget_attribute *attr, char *buf)
{
	if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_IN_AMP))
		return 0;
	return sprintf(buf, "0x%08x\n",
		       snd_hdac_read_parm(codec, nid, AC_PAR_AMP_IN_CAP));
}

static ssize_t amp_out_caps_show(struct hdac_device *codec, hda_nid_t nid,
				 struct widget_attribute *attr, char *buf)
{
	if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_OUT_AMP))
		return 0;
	return sprintf(buf, "0x%08x\n",
		       snd_hdac_read_parm(codec, nid, AC_PAR_AMP_OUT_CAP));
}

static ssize_t power_caps_show(struct hdac_device *codec, hda_nid_t nid,
			       struct widget_attribute *attr, char *buf)
{
	if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_POWER))
		return 0;
	return sprintf(buf, "0x%08x\n",
		       snd_hdac_read_parm(codec, nid, AC_PAR_POWER_STATE));
}

static ssize_t gpio_caps_show(struct hdac_device *codec, hda_nid_t nid,
			      struct widget_attribute *attr, char *buf)
{
	return sprintf(buf, "0x%08x\n",
		       snd_hdac_read_parm(codec, nid, AC_PAR_GPIO_CAP));
}

static ssize_t connections_show(struct hdac_device *codec, hda_nid_t nid,
				struct widget_attribute *attr, char *buf)
{
	hda_nid_t list[32];
	int i, nconns;
	ssize_t ret = 0;

	nconns = snd_hdac_get_connections(codec, nid, list, ARRAY_SIZE(list));
	if (nconns <= 0)
		return nconns;
	for (i = 0; i < nconns; i++)
		ret += sprintf(buf + ret, "%s0x%02x", i ? " " : "", list[i]);
	ret += sprintf(buf + ret, "\n");
	return ret;
}

static WIDGET_ATTR_RO(caps);
static WIDGET_ATTR_RO(pin_caps);
static WIDGET_ATTR_RO(pin_cfg);
static WIDGET_ATTR_RO(pcm_caps);
static WIDGET_ATTR_RO(pcm_formats);
static WIDGET_ATTR_RO(amp_in_caps);
static WIDGET_ATTR_RO(amp_out_caps);
static WIDGET_ATTR_RO(power_caps);
static WIDGET_ATTR_RO(gpio_caps);
static WIDGET_ATTR_RO(connections);

static struct attribute *widget_node_attrs[] = {
	&wid_attr_caps.attr,
	&wid_attr_pin_caps.attr,
	&wid_attr_pin_cfg.attr,
	&wid_attr_pcm_caps.attr,
	&wid_attr_pcm_formats.attr,
	&wid_attr_amp_in_caps.attr,
	&wid_attr_amp_out_caps.attr,
	&wid_attr_power_caps.attr,
	&wid_attr_connections.attr,
	NULL,
};

static struct attribute *widget_afg_attrs[] = {
	&wid_attr_pcm_caps.attr,
	&wid_attr_pcm_formats.attr,
	&wid_attr_amp_in_caps.attr,
	&wid_attr_amp_out_caps.attr,
	&wid_attr_power_caps.attr,
	&wid_attr_gpio_caps.attr,
	NULL,
};

static const struct attribute_group widget_node_group = {
	.attrs = widget_node_attrs,
};

static const struct attribute_group widget_afg_group = {
	.attrs = widget_afg_attrs,
};

static void free_widget_node(struct kobject *kobj,
			     const struct attribute_group *group)
{
	if (kobj) {
		sysfs_remove_group(kobj, group);
		kobject_put(kobj);
	}
}

static void widget_tree_free(struct hdac_device *codec)
{
	struct hdac_widget_tree *tree = codec->widgets;
	struct kobject **p;

	if (!tree)
		return;
327
	free_widget_node(tree->afg, &widget_afg_group);
328 329 330 331 332
	if (tree->nodes) {
		for (p = tree->nodes; *p; p++)
			free_widget_node(*p, &widget_node_group);
		kfree(tree->nodes);
	}
333
	kobject_put(tree->root);
334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386
	kfree(tree);
	codec->widgets = NULL;
}

static int add_widget_node(struct kobject *parent, hda_nid_t nid,
			   const struct attribute_group *group,
			   struct kobject **res)
{
	struct kobject *kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
	int err;

	if (!kobj)
		return -ENOMEM;
	kobject_init(kobj, &widget_ktype);
	err = kobject_add(kobj, parent, "%02x", nid);
	if (err < 0)
		return err;
	err = sysfs_create_group(kobj, group);
	if (err < 0) {
		kobject_put(kobj);
		return err;
	}

	*res = kobj;
	return 0;
}

static int widget_tree_create(struct hdac_device *codec)
{
	struct hdac_widget_tree *tree;
	int i, err;
	hda_nid_t nid;

	tree = codec->widgets = kzalloc(sizeof(*tree), GFP_KERNEL);
	if (!tree)
		return -ENOMEM;

	tree->root = kobject_create_and_add("widgets", &codec->dev.kobj);
	if (!tree->root)
		return -ENOMEM;

	tree->nodes = kcalloc(codec->num_nodes + 1, sizeof(*tree->nodes),
			      GFP_KERNEL);
	if (!tree->nodes)
		return -ENOMEM;

	for (i = 0, nid = codec->start_nid; i < codec->num_nodes; i++, nid++) {
		err = add_widget_node(tree->root, nid, &widget_node_group,
				      &tree->nodes[i]);
		if (err < 0)
			return err;
	}

387 388 389 390 391 392 393
	if (codec->afg) {
		err = add_widget_node(tree->root, codec->afg,
				      &widget_afg_group, &tree->afg);
		if (err < 0)
			return err;
	}

394 395 396 397 398 399 400 401
	kobject_uevent(tree->root, KOBJ_CHANGE);
	return 0;
}

int hda_widget_sysfs_init(struct hdac_device *codec)
{
	int err;

402 403 404
	if (codec->widgets)
		return 0; /* already created */

405 406 407 408 409 410 411 412 413 414 415 416 417
	err = widget_tree_create(codec);
	if (err < 0) {
		widget_tree_free(codec);
		return err;
	}

	return 0;
}

void hda_widget_sysfs_exit(struct hdac_device *codec)
{
	widget_tree_free(codec);
}
418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464

int hda_widget_sysfs_reinit(struct hdac_device *codec,
			    hda_nid_t start_nid, int num_nodes)
{
	struct hdac_widget_tree *tree;
	hda_nid_t end_nid = start_nid + num_nodes;
	hda_nid_t nid;
	int i;

	if (!codec->widgets)
		return hda_widget_sysfs_init(codec);

	tree = kmemdup(codec->widgets, sizeof(*tree), GFP_KERNEL);
	if (!tree)
		return -ENOMEM;

	tree->nodes = kcalloc(num_nodes + 1, sizeof(*tree->nodes), GFP_KERNEL);
	if (!tree->nodes) {
		kfree(tree);
		return -ENOMEM;
	}

	/* prune non-existing nodes */
	for (i = 0, nid = codec->start_nid; i < codec->num_nodes; i++, nid++) {
		if (nid < start_nid || nid >= end_nid)
			free_widget_node(codec->widgets->nodes[i],
					 &widget_node_group);
	}

	/* add new nodes */
	for (i = 0, nid = start_nid; i < num_nodes; i++, nid++) {
		if (nid < codec->start_nid || nid >= codec->end_nid)
			add_widget_node(tree->root, nid, &widget_node_group,
					&tree->nodes[i]);
		else
			tree->nodes[i] =
				codec->widgets->nodes[nid - codec->start_nid];
	}

	/* replace with the new tree */
	kfree(codec->widgets->nodes);
	kfree(codec->widgets);
	codec->widgets = tree;

	kobject_uevent(tree->root, KOBJ_CHANGE);
	return 0;
}