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w1: use default attribute groups for w1 slave devices 

As we have 2 sysfs files for the w1 slave devices, let the driver core
create / destroy them automatically by setting the default attribute
group for them, saving code and housekeeping logic.

Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2013-08-21 13:24:33 -07:00
parent 47eba33a09
commit 5b187b3c0e
1 changed files with 11 additions and 27 deletions
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38
drivers/w1/w1.c
View File

@ -96,14 +96,15 @@ static void w1_slave_release(struct device *dev)
complete(&sl->released);
}
static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf)
static ssize_t name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct w1_slave *sl = dev_to_w1_slave(dev);
return sprintf(buf, "%s\n", sl->name);
}
static DEVICE_ATTR_RO(name);
static ssize_t w1_slave_read_id(struct device *dev,
static ssize_t id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct w1_slave *sl = dev_to_w1_slave(dev);
@ -112,11 +113,14 @@ static ssize_t w1_slave_read_id(struct device *dev,
memcpy(buf, (u8 *)&sl->reg_num, count);
return count;
}
static DEVICE_ATTR_RO(id);
static struct device_attribute w1_slave_attr_name =
__ATTR(name, S_IRUGO, w1_slave_read_name, NULL);
static struct device_attribute w1_slave_attr_id =
__ATTR(id, S_IRUGO, w1_slave_read_id, NULL);
static struct attribute *w1_slave_attrs[] = {
&dev_attr_name.attr,
&dev_attr_id.attr,
NULL,
};
ATTRIBUTE_GROUPS(w1_slave);
/* Default family */
@ -610,25 +614,6 @@ static int w1_bus_notify(struct notifier_block *nb, unsigned long action,
switch (action) {
case BUS_NOTIFY_ADD_DEVICE:
/* Create our sysfs files before userspace is told about it */
/* Create "name" entry */
err = device_create_file(&sl->dev, &w1_slave_attr_name);
if (err < 0) {
dev_err(&sl->dev,
"sysfs file creation for [%s] failed. err=%d\n",
dev_name(&sl->dev), err);
return err;
}
/* Create "id" entry */
err = device_create_file(&sl->dev, &w1_slave_attr_id);
if (err < 0) {
dev_err(&sl->dev,
"sysfs file creation for [%s] failed. err=%d\n",
dev_name(&sl->dev), err);
return err;
}
/* if the family driver needs to initialize something... */
if (sl->family->fops && sl->family->fops->add_slave &&
((err = sl->family->fops->add_slave(sl)) < 0)) {
@ -643,8 +628,6 @@ static int w1_bus_notify(struct notifier_block *nb, unsigned long action,
/* Remove our sysfs files */
if (sl->family->fops && sl->family->fops->remove_slave)
sl->family->fops->remove_slave(sl);
device_remove_file(&sl->dev, &w1_slave_attr_id);
device_remove_file(&sl->dev, &w1_slave_attr_name);
break;
}
return 0;
@ -662,6 +645,7 @@ static int __w1_attach_slave_device(struct w1_slave *sl)
sl->dev.driver = &w1_slave_driver;
sl->dev.bus = &w1_bus_type;
sl->dev.release = &w1_slave_release;
sl->dev.groups = w1_slave_groups;
dev_set_name(&sl->dev, "%02x-%012llx",
(unsigned int) sl->reg_num.family,