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

---
commit 2a9d0c178158da4a9bcf22311a414c26a8102d13
tree 7039be0c9767193b1046d737686bb00c8dbf64d3
parent 6b729861831177b270a2932a13e79cb41d673146
author Evgeniy Polyakov <johnpol@2ka.mipt.ru> Sat, 04 Jun 2005 01:31:02 +0400
committer Greg Kroah-Hartman <gregkh@suse.de> Tue, 21 Jun 2005 21:43:11 -0700

drivers/w1/w1.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++++-
drivers/w1/w1.h | 1 +
drivers/w1/w1_int.c | 1 +
3 files changed, 51 insertions(+), 1 deletions(-)

diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -148,6 +148,39 @@ static ssize_t w1_master_attribute_show_
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_
__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
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_defau
&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
--- 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
--- a/drivers/w1/w1_int.c
+++ b/drivers/w1/w1_int.c
@@ -69,6 +69,7 @@ static struct w1_master * w1_alloc_dev(u
dev->initialized = 0;
dev->id = id;
dev->slave_ttl = slave_ttl;
+ dev->search_count = -1; /* continual scan */

atomic_set(&dev->refcnt, 2);

-
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