// SPDX-License-Identifier: GPL-2.0-only
/*
* sysfs interface for HD-audio codec
*
* Copyright (c) 2014 Takashi Iwai <[email protected]>
*
* split from hda_hwdep.c
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/compat.h>
#include <linux/mutex.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/export.h>
#include <sound/core.h>
#include <sound/hda_codec.h>
#include "hda_local.h"
#include <sound/hda_hwdep.h>
#include <sound/minors.h>
/* hint string pair */
struct hda_hint {
const char *key;
const char *val; /* contained in the same alloc as key */
};
static ssize_t power_on_acct_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hda_codec *codec = dev_get_drvdata(dev);
snd_hda_update_power_acct(codec);
return sysfs_emit(buf, "%u\n", jiffies_to_msecs(codec->power_on_acct));
}
static ssize_t power_off_acct_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hda_codec *codec = dev_get_drvdata(dev);
snd_hda_update_power_acct(codec);
return sysfs_emit(buf, "%u\n", jiffies_to_msecs(codec->power_off_acct));
}
static DEVICE_ATTR_RO(power_on_acct);
static DEVICE_ATTR_RO(power_off_acct);
#define CODEC_INFO_SHOW(type, field) \
static ssize_t type##_show(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
struct hda_codec *codec = dev_get_drvdata(dev); \
return sysfs_emit(buf, "0x%x\n", codec->field); \
}
#define CODEC_INFO_STR_SHOW(type, field) \
static ssize_t type##_show(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
struct hda_codec *codec = dev_get_drvdata(dev); \
return sysfs_emit(buf, "%s\n", \
codec->field ? codec->field : ""); \
}
CODEC_INFO_SHOW(vendor_id, core.vendor_id);
CODEC_INFO_SHOW(subsystem_id, core.subsystem_id);
CODEC_INFO_SHOW(revision_id, core.revision_id);
CODEC_INFO_SHOW(afg, core.afg);
CODEC_INFO_SHOW(mfg, core.mfg);
CODEC_INFO_STR_SHOW(vendor_name, core.vendor_name);
CODEC_INFO_STR_SHOW(chip_name, core.chip_name);
CODEC_INFO_STR_SHOW(modelname, modelname);
static ssize_t pin_configs_show(struct hda_codec *codec,
struct snd_array *list,
char *buf)
{
const struct hda_pincfg *pin;
int i, len = 0;
mutex_lock(&codec->user_mutex);
snd_array_for_each(list, i, pin) {
len += sysfs_emit_at(buf, len, "0x%02x 0x%08x\n",
pin->nid, pin->cfg);
}
mutex_unlock(&codec->user_mutex);
return len;
}
static ssize_t init_pin_configs_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hda_codec *codec = dev_get_drvdata(dev);
return pin_configs_show(codec, &codec->init_pins, buf);
}
static ssize_t driver_pin_configs_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hda_codec *codec = dev_get_drvdata(dev);
return pin_configs_show(codec, &codec->driver_pins, buf);
}
#ifdef CONFIG_SND_HDA_RECONFIG
/*
* sysfs interface
*/
static int clear_codec(struct hda_codec *codec)
{
int err;
err = snd_hda_codec_reset(codec);
if (err < 0) {
codec_err(codec, "The codec is being used, can't free.\n");
return err;
}
snd_hda_sysfs_clear(codec);
return 0;
}
static int reconfig_codec(struct hda_codec *codec)
{
int err;
snd_hda_power_up(codec);
codec_info(codec, "hda-codec: reconfiguring\n");
err = snd_hda_codec_reset(codec);
if (err < 0) {
codec_err(codec,
"The codec is being used, can't reconfigure.\n");
goto error;
}
err = device_reprobe(hda_codec_dev(codec));
if (err < 0)
goto error;
err = snd_card_register(codec->card);
error:
snd_hda_power_down(codec);
return err;
}
/*
* allocate a string at most len chars, and remove the trailing EOL
*/
static char *kstrndup_noeol(const char *src, size_t len)
{
char *s = kstrndup(src, len, GFP_KERNEL);
char *p;
if (!s)
return NULL;
p = strchr(s, '\n');
if (p)
*p = 0;
return s;
}
#define CODEC_INFO_STORE(type, field) \
static ssize_t type##_store(struct device *dev, \
struct device_attribute *attr, \
const char *buf, size_t count) \
{ \
struct hda_codec *codec = dev_get_drvdata(dev); \
unsigned long val; \
int err = kstrtoul(buf, 0, &val); \
if (err < 0) \
return err; \
codec->field = val; \
return count; \
}
#define CODEC_INFO_STR_STORE(type, field) \
static ssize_t type##_store(struct device *dev, \
struct device_attribute *attr, \
const char *buf, size_t count) \
{ \
struct hda_codec *codec = dev_get_drvdata(dev); \
char *s = kstrndup_noeol(buf, 64); \
if (!s) \
return -ENOMEM; \
kfree(codec->field); \
codec->field = s; \
return count; \
}
CODEC_INFO_STORE(vendor_id, core.vendor_id);
CODEC_INFO_STORE(subsystem_id, core.subsystem_id);
CODEC_INFO_STORE(revision_id, core.revision_id);
CODEC_INFO_STR_STORE(vendor_name, core.vendor_name);
CODEC_INFO_STR_STORE(chip_name, core.chip_name);
CODEC_INFO_STR_STORE(modelname, modelname);
#define CODEC_ACTION_STORE(type) \
static ssize_t type##_store(struct device *dev, \
struct device_attribute *attr, \
const char *buf, size_t count) \
{ \
struct hda_codec *codec = dev_get_drvdata(dev); \
int err = 0; \
if (*buf) \
err = type##_codec(codec); \
return err < 0 ? err : count; \
}
CODEC_ACTION_STORE(reconfig);
CODEC_ACTION_STORE(clear);
static ssize_t init_verbs_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hda_codec *codec = dev_get_drvdata(dev);
const struct hda_verb *v;
int i, len = 0;
mutex_lock(&codec->user_mutex);
snd_array_for_each(&codec->init_verbs, i, v) {
len += sysfs_emit_at(buf, len, "0x%02x 0x%03x 0x%04x\n",
v->nid, v->verb, v->param);
}
mutex_unlock(&codec->user_mutex);
return len;
}
static int parse_init_verbs(struct hda_codec *codec, const char *buf)
{
struct hda_verb *v;
int nid, verb, param;
if (sscanf(buf, "%i %i %i", &nid, &verb, ¶m) != 3)
return -EINVAL;
if (!nid || !verb)
return -EINVAL;
mutex_lock(&codec->user_mutex);
v = snd_array_new(&codec->init_verbs);
if (!v) {
mutex_unlock(&codec->user_mutex);
return -ENOMEM;
}
v->nid = nid;
v->verb = verb;
v->param = param;
mutex_unlock(&codec->user_mutex);
return 0;
}
static ssize_t init_verbs_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct hda_codec *codec = dev_get_drvdata(dev);
int err = parse_init_verbs(codec, buf);
if (err < 0)
return err;
return count;
}
static ssize_t hints_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hda_codec *codec = dev_get_drvdata(dev);
const struct hda_hint *hint;
int i, len = 0;
mutex_lock(&codec->user_mutex);
snd_array_for_each(&codec->hints, i, hint) {
len += sysfs_emit_at(buf, len, "%s = %s\n",
hint->key, hint->val);
}
mutex_unlock(&codec->user_mutex);
return len;
}
static struct hda_hint *get_hint(struct hda_codec *codec, const char *key)
{
struct hda_hint *hint;
int i;
snd_array_for_each(&codec->hints, i, hint) {
if (!strcmp(hint->key, key))
return hint;
}
return NULL;
}
static void remove_trail_spaces(char *str)
{
char *p;
if (!*str)
return;
p = str + strlen(str) - 1;
for (; isspace(*p); p--) {
*p = 0;
if (p == str)
return;
}
}
#define MAX_HINTS 1024
static int parse_hints(struct hda_codec *codec, const char *buf)
{
char *key, *val;
struct hda_hint *hint;
int err = 0;
buf = skip_spaces(buf);
if (!*buf || *buf == '#' || *buf == '\n')
return 0;
if (*buf == '=')
return -EINVAL;
key = kstrndup_noeol(buf, 1024);
if (!key)
return -ENOMEM;
/* extract key and val */
val = strchr(key, '=');
if (!val) {
kfree(key);
return -EINVAL;
}
*val++ = 0;
val = skip_spaces(val);
remove_trail_spaces(key);
remove_trail_spaces(val);
mutex_lock(&codec->user_mutex);
hint = get_hint(codec, key);
if (hint) {
/* replace */
kfree(hint->key);
hint->key = key;
hint->val = val;
goto unlock;
}
/* allocate a new hint entry */
if (codec->hints.used >= MAX_HINTS)
hint = NULL;
else
hint = snd_array_new(&codec->hints);
if (hint) {
hint->key = key;
hint->val = val;
} else {
err = -ENOMEM;
}
unlock:
mutex_unlock(&codec->user_mutex);
if (err)
kfree(key);
return err;
}
static ssize_t hints_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct hda_codec *codec = dev_get_drvdata(dev);
int err = parse_hints(codec, buf);
if (err < 0)
return err;
return count;
}
static ssize_t user_pin_configs_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hda_codec *codec = dev_get_drvdata(dev);
return pin_configs_show(codec, &codec->user_pins, buf);
}
static int parse_user_pin_configs(struct hda_codec *codec, const char *buf)
{
int nid, cfg, err;
if (sscanf(buf, "%i %i", &nid, &cfg) != 2)
return -EINVAL;
if (!nid)
return -EINVAL;
mutex_lock(&codec->user_mutex);
err = snd_hda_add_pincfg(codec, &codec->user_pins, nid, cfg);
mutex_unlock(&codec->user_mutex);
return err;
}
static ssize_t user_pin_configs_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct hda_codec *codec = dev_get_drvdata(dev);
int err = parse_user_pin_configs(codec, buf);
if (err < 0)
return err;
return count;
}
/* sysfs attributes exposed only when CONFIG_SND_HDA_RECONFIG=y */
static DEVICE_ATTR_RW(init_verbs);
static DEVICE_ATTR_RW(hints);
static DEVICE_ATTR_RW(user_pin_configs);
static DEVICE_ATTR_WO(reconfig);
static DEVICE_ATTR_WO(clear);
/**
* snd_hda_get_hint - Look for hint string
* @codec: the HDA codec
* @key: the hint key string
*
* Look for a hint key/value pair matching with the given key string
* and returns the value string. If nothing found, returns NULL.
*/
const char *snd_hda_get_hint(struct hda_codec *codec, const char *key)
{
struct hda_hint *hint = get_hint(codec, key);
return hint ? hint->val : NULL;
}
EXPORT_SYMBOL_GPL(snd_hda_get_hint);
/**
* snd_hda_get_bool_hint - Get a boolean hint value
* @codec: the HDA codec
* @key: the hint key string
*
* Look for a hint key/value pair matching with the given key string
* and returns a boolean value parsed from the value. If no matching
* key is found, return a negative value.
*/
int snd_hda_get_bool_hint(struct hda_codec *codec, const char *key)
{
const char *p;
int ret;
mutex_lock(&codec->user_mutex);
p = snd_hda_get_hint(codec, key);
if (!p || !*p)
ret = -ENOENT;
else {
switch (toupper(*p)) {
case 'T': /* true */
case 'Y': /* yes */
case '1':
ret = 1;
break;
default:
ret = 0;
break;
}
}
mutex_unlock(&codec->user_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(snd_hda_get_bool_hint);
/**
* snd_hda_get_int_hint - Get an integer hint value
* @codec: the HDA codec
* @key: the hint key string
* @valp: pointer to store a value
*
* Look for a hint key/value pair matching with the given key string
* and stores the integer value to @valp. If no matching key is found,
* return a negative error code. Otherwise it returns zero.
*/
int snd_hda_get_int_hint(struct hda_codec *codec, const char *key, int *valp)
{
const char *p;
unsigned long val;
int ret;
mutex_lock(&codec->user_mutex);
p = snd_hda_get_hint(codec, key);
if (!p)
ret = -ENOENT;
else if (kstrtoul(p, 0, &val))
ret = -EINVAL;
else {
*valp = val;
ret = 0;
}
mutex_unlock(&codec->user_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(snd_hda_get_int_hint);
#endif /* CONFIG_SND_HDA_RECONFIG */
/*
* common sysfs attributes
*/
#ifdef CONFIG_SND_HDA_RECONFIG
#define RECONFIG_DEVICE_ATTR(name) DEVICE_ATTR_RW(name)
#else
#define RECONFIG_DEVICE_ATTR(name) DEVICE_ATTR_RO(name)
#endif
static RECONFIG_DEVICE_ATTR(vendor_id);
static RECONFIG_DEVICE_ATTR(subsystem_id);
static RECONFIG_DEVICE_ATTR(revision_id);
static DEVICE_ATTR_RO(afg);
static DEVICE_ATTR_RO(mfg);
static RECONFIG_DEVICE_ATTR(vendor_name);
static RECONFIG_DEVICE_ATTR(chip_name);
static RECONFIG_DEVICE_ATTR(modelname);
static DEVICE_ATTR_RO(init_pin_configs);
static DEVICE_ATTR_RO(driver_pin_configs);
#ifdef CONFIG_SND_HDA_PATCH_LOADER
/* parser mode */
enum {
LINE_MODE_NONE,
LINE_MODE_CODEC,
LINE_MODE_MODEL,
LINE_MODE_PINCFG,
LINE_MODE_VERB,
LINE_MODE_HINT,
LINE_MODE_VENDOR_ID,
LINE_MODE_SUBSYSTEM_ID,
LINE_MODE_REVISION_ID,
LINE_MODE_CHIP_NAME,
NUM_LINE_MODES,
};
static inline int strmatch(const char *a, const char *b)
{
return strncasecmp(a, b, strlen(b)) == 0;
}
/* parse the contents after the line "[codec]"
* accept only the line with three numbers, and assign the current codec
*/
static void parse_codec_mode(char *buf, struct hda_bus *bus,
struct hda_codec **codecp)
{
int vendorid, subid, caddr;
struct hda_codec *codec;
*codecp = NULL;
if (sscanf(buf, "%i %i %i", &vendorid, &subid, &caddr) == 3) {
list_for_each_codec(codec, bus) {
if ((vendorid <= 0 || codec->core.vendor_id == vendorid) &&
(subid <= 0 || codec->core.subsystem_id == subid) &&
codec->core.addr == caddr) {
*codecp = codec;
break;
}
}
}
}
/* parse the contents after the other command tags, [pincfg], [verb],
* [vendor_id], [subsystem_id], [revision_id], [chip_name], [hint] and [model]
* just pass to the sysfs helper (only when any codec was specified)
*/
static void parse_pincfg_mode(char *buf, struct hda_bus *bus,
struct hda_codec **codecp)
{
parse_user_pin_configs(*codecp, buf);
}
static void parse_verb_mode(char *buf, struct hda_bus *bus,
struct hda_codec **codecp)
{
parse_init_verbs(*codecp, buf);
}
static void parse_hint_mode(char *buf, struct hda_bus *bus,
struct hda_codec **codecp)
{
parse_hints(*codecp, buf);
}
static void parse_model_mode(char *buf, struct hda_bus *bus,
struct hda_codec **codecp)
{
kfree((*codecp)->modelname);
(*codecp)->modelname = kstrdup(buf, GFP_KERNEL);
}
static void parse_chip_name_mode(char *buf, struct hda_bus *bus,
struct hda_codec **codecp)
{
snd_hda_codec_set_name(*codecp, buf);
}
#define DEFINE_PARSE_ID_MODE(name) \
static void parse_##name##_mode(char *buf, struct hda_bus *bus, \
struct hda_codec **codecp) \
{ \
unsigned long val; \
if (!kstrtoul(buf, 0, &val)) \
(*codecp)->core.name = val; \
}
DEFINE_PARSE_ID_MODE(vendor_id);
DEFINE_PARSE_ID_MODE(subsystem_id);
DEFINE_PARSE_ID_MODE(revision_id);
struct hda_patch_item {
const char *tag;
const char *alias;
void (*parser)(char *buf, struct hda_bus *bus, struct hda_codec **retc);
};
static const struct hda_patch_item patch_items[NUM_LINE_MODES] = {
[LINE_MODE_CODEC] = {
.tag = "[codec]",
.parser = parse_codec_mode,
},
[LINE_MODE_MODEL] = {
.tag = "[model]",
.parser = parse_model_mode,
},
[LINE_MODE_VERB] = {
.tag = "[verb]",
.alias = "[init_verbs]",
.parser = parse_verb_mode,
},
[LINE_MODE_PINCFG] = {
.tag = "[pincfg]",
.alias = "[user_pin_configs]",
.parser = parse_pincfg_mode,
},
[LINE_MODE_HINT] = {
.tag = "[hint]",
.alias = "[hints]",
.parser = parse_hint_mode
},
[LINE_MODE_VENDOR_ID] = {
.tag = "[vendor_id]",
.parser = parse_vendor_id_mode,
},
[LINE_MODE_SUBSYSTEM_ID] = {
.tag = "[subsystem_id]",
.parser = parse_subsystem_id_mode,
},
[LINE_MODE_REVISION_ID] = {
.tag = "[revision_id]",
.parser = parse_revision_id_mode,
},
[LINE_MODE_CHIP_NAME] = {
.tag = "[chip_name]",
.parser = parse_chip_name_mode,
},
};
/* check the line starting with '[' -- change the parser mode accodingly */
static int parse_line_mode(char *buf, struct hda_bus *bus)
{
int i;
for (i = 0; i < ARRAY_SIZE(patch_items); i++) {
if (!patch_items[i].tag)
continue;
if (strmatch(buf, patch_items[i].tag))
return i;
if (patch_items[i].alias && strmatch(buf, patch_items[i].alias))
return i;
}
return LINE_MODE_NONE;
}
/* copy one line from the buffer in fw, and update the fields in fw
* return zero if it reaches to the end of the buffer, or non-zero
* if successfully copied a line
*
* the spaces at the beginning and the end of the line are stripped
*/
static int get_line_from_fw(char *buf, int size, size_t *fw_size_p,
const void **fw_data_p)
{
int len;
size_t fw_size = *fw_size_p;
const char *p = *fw_data_p;
while (isspace(*p) && fw_size) {
p++;
fw_size--;
}
if (!fw_size)
return 0;
for (len = 0; len < fw_size; len++) {
if (!*p)
break;
if (*p == '\n') {
p++;
len++;
break;
}
if (len < size)
*buf++ = *p++;
}
*buf = 0;
*fw_size_p = fw_size - len;
*fw_data_p = p;
remove_trail_spaces(buf);
return 1;
}
/**
* snd_hda_load_patch - load a "patch" firmware file and parse it
* @bus: HD-audio bus
* @fw_size: the firmware byte size
* @fw_buf: the firmware data
*/
int snd_hda_load_patch(struct hda_bus *bus, size_t fw_size, const void *fw_buf)
{
char buf[128];
struct hda_codec *codec;
int line_mode;
line_mode = LINE_MODE_NONE;
codec = NULL;
while (get_line_from_fw(buf, sizeof(buf) - 1, &fw_size, &fw_buf)) {
if (!*buf || *buf == '#' || *buf == '\n')
continue;
if (*buf == '[')
line_mode = parse_line_mode(buf, bus);
else if (patch_items[line_mode].parser &&
(codec || line_mode <= LINE_MODE_CODEC))
patch_items[line_mode].parser(buf, bus, &codec);
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_hda_load_patch);
#endif /* CONFIG_SND_HDA_PATCH_LOADER */
/*
* sysfs entries
*/
static struct attribute *hda_dev_attrs[] = {
&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,
&dev_attr_modelname.attr,
&dev_attr_init_pin_configs.attr,
&dev_attr_driver_pin_configs.attr,
&dev_attr_power_on_acct.attr,
&dev_attr_power_off_acct.attr,
#ifdef CONFIG_SND_HDA_RECONFIG
&dev_attr_init_verbs.attr,
&dev_attr_hints.attr,
&dev_attr_user_pin_configs.attr,
&dev_attr_reconfig.attr,
&dev_attr_clear.attr,
#endif
NULL
};
static const struct attribute_group hda_dev_attr_group = {
.attrs = hda_dev_attrs,
};
const struct attribute_group *snd_hda_dev_attr_groups[] = {
&hda_dev_attr_group,
NULL
};
void snd_hda_sysfs_init(struct hda_codec *codec)
{
mutex_init(&codec->user_mutex);
#ifdef CONFIG_SND_HDA_RECONFIG
snd_array_init(&codec->init_verbs, sizeof(struct hda_verb), 32);
snd_array_init(&codec->hints, sizeof(struct hda_hint), 32);
snd_array_init(&codec->user_pins, sizeof(struct hda_pincfg), 16);
#endif
}
void snd_hda_sysfs_clear(struct hda_codec *codec)
{
#ifdef CONFIG_SND_HDA_RECONFIG
struct hda_hint *hint;
int i;
/* clear init verbs */
snd_array_free(&codec->init_verbs);
/* clear hints */
snd_array_for_each(&codec->hints, i, hint) {
kfree(hint->key); /* we don't need to free hint->val */
}
snd_array_free(&codec->hints);
snd_array_free(&codec->user_pins);
#endif
}
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