linux/sound/hda/hdac_sysfs.c
Markus Elfring 24d9b755ab ALSA: hda: Delete an unnecessary check before the function call "kobject_put"
The kobject_put() function tests whether its argument is NULL and then
returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2015-07-09 14:20:27 +02:00

406 lines
9.6 KiB
C

/*
* 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)
CODEC_ATTR(type);
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);
static struct attribute *hdac_dev_attrs[] = {
&dev_attr_type.attr,
&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,
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;
free_widget_node(tree->afg, &widget_afg_group);
if (tree->nodes) {
for (p = tree->nodes; *p; p++)
free_widget_node(*p, &widget_node_group);
kfree(tree->nodes);
}
kobject_put(tree->root);
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;
}
if (codec->afg) {
err = add_widget_node(tree->root, codec->afg,
&widget_afg_group, &tree->afg);
if (err < 0)
return err;
}
kobject_uevent(tree->root, KOBJ_CHANGE);
return 0;
}
int hda_widget_sysfs_init(struct hdac_device *codec)
{
int err;
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);
}