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authorEvgeniy Polyakov <johnpol@2ka.mipt.ru>2005-06-04 01:31:02 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2005-06-22 08:43:11 +0400
commit2a9d0c178158da4a9bcf22311a414c26a8102d13 (patch)
tree7039be0c9767193b1046d737686bb00c8dbf64d3
parent6b729861831177b270a2932a13e79cb41d673146 (diff)
downloadlinux-2a9d0c178158da4a9bcf22311a414c26a8102d13.tar.xz
[PATCH] w1: Adds a sysfs entry (w1_master_search) that allows you to disable/enable periodic searches.
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>
-rw-r--r--drivers/w1/w1.c50
-rw-r--r--drivers/w1/w1.h1
-rw-r--r--drivers/w1/w1_int.c1
3 files changed, 51 insertions, 1 deletions
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 4fa959f08554..48da17596d43 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -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);
}
diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h
index 3cfdd08d32fc..6b5f7be50b8a 100644
--- a/drivers/w1/w1.h
+++ b/drivers/w1/w1.h
@@ -162,6 +162,7 @@ struct w1_master
int slave_ttl;
int initialized;
u32 id;
+ int search_count;
atomic_t refcnt;
diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c
index 280f140ae698..cf18f1324f03 100644
--- a/drivers/w1/w1_int.c
+++ b/drivers/w1/w1_int.c
@@ -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);