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[PATCH] w1: Adds a sysfs entry (w1_master_search) that allows you to disable/enable periodic searches.

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Adds a sysfs entry (w1_master_search) that allows you to disable/enable
periodic searches.

Signed-off-by: Ben Gardner <bgardner@wabtec.com>
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Evgeniy Polyakov 2005-06-04 01:31:02 +04:00 committed by Greg Kroah-Hartman
parent 6b72986183
commit 2a9d0c1781
3 changed files with 51 additions and 1 deletions
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50
drivers/w1/w1.c
View file

@ -148,6 +148,39 @@ static ssize_t w1_master_attribute_show_name(struct device *dev, struct device_a
return count;
}
static ssize_t w1_master_attribute_store_search(struct device * dev,
struct device_attribute *attr,
const char * buf, size_t count)
{
struct w1_master *md = container_of(dev, struct w1_master, dev);
if (down_interruptible (&md->mutex))
return -EBUSY;
md->search_count = simple_strtol(buf, NULL, 0);
up(&md->mutex);
return count;
}
static ssize_t w1_master_attribute_show_search(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct w1_master *md = container_of(dev, struct w1_master, dev);
ssize_t count;
if (down_interruptible (&md->mutex))
return -EBUSY;
count = sprintf(buf, "%d\n", md->search_count);
up(&md->mutex);
return count;
}
static ssize_t w1_master_attribute_show_pointer(struct device *dev, struct device_attribute *attr, char *buf)
{
struct w1_master *md = container_of(dev, struct w1_master, dev);
@ -242,6 +275,12 @@ static ssize_t w1_master_attribute_show_slaves(struct device *dev, struct device
__ATTR(w1_master_##_name, _mode, \
w1_master_attribute_show_##_name, NULL)
#define W1_MASTER_ATTR_RW(_name, _mode) \
struct device_attribute w1_master_attribute_##_name = \
__ATTR(w1_master_##_name, _mode, \
w1_master_attribute_show_##_name, \
w1_master_attribute_store_##_name)
static W1_MASTER_ATTR_RO(name, S_IRUGO);
static W1_MASTER_ATTR_RO(slaves, S_IRUGO);
static W1_MASTER_ATTR_RO(slave_count, S_IRUGO);
@ -249,6 +288,7 @@ static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO);
static W1_MASTER_ATTR_RO(attempts, S_IRUGO);
static W1_MASTER_ATTR_RO(timeout, S_IRUGO);
static W1_MASTER_ATTR_RO(pointer, S_IRUGO);
static W1_MASTER_ATTR_RW(search, S_IRUGO | S_IWUGO);
static struct attribute *w1_master_default_attrs[] = {
&w1_master_attribute_name.attr,
@ -258,6 +298,7 @@ static struct attribute *w1_master_default_attrs[] = {
&w1_master_attribute_attempts.attr,
&w1_master_attribute_timeout.attr,
&w1_master_attribute_pointer.attr,
&w1_master_attribute_search.attr,
NULL
};
@ -643,11 +684,14 @@ int w1_process(void *data)
if (!dev->initialized)
continue;
if (dev->search_count == 0)
continue;
if (down_interruptible(&dev->mutex))
continue;
list_for_each_entry(sl, &dev->slist, w1_slave_entry)
clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
clear_bit(W1_SLAVE_ACTIVE, (long *)&sl->flags);
w1_search_devices(dev, w1_slave_found);
@ -662,6 +706,10 @@ int w1_process(void *data)
} else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))
sl->ttl = dev->slave_ttl;
}
if (dev->search_count > 0)
dev->search_count--;
up(&dev->mutex);
}

1
drivers/w1/w1.h
View file

@ -162,6 +162,7 @@ struct w1_master
int slave_ttl;
int initialized;
u32 id;
int search_count;
atomic_t refcnt;

1
drivers/w1/w1_int.c
View file

@ -69,6 +69,7 @@ static struct w1_master * w1_alloc_dev(u32 id, int slave_count, int slave_ttl,
dev->initialized = 0;
dev->id = id;
dev->slave_ttl = slave_ttl;
dev->search_count = -1; /* continual scan */
atomic_set(&dev->refcnt, 2);