W1: feature, enable hardware strong pullup

[platform/kernel/linux-starfive.git] / drivers / w1 / w1.c

diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 9b5c117..32418d4 100644 (file)
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -246,10 +246,14 @@ static ssize_t w1_master_attribute_store_search(struct device * dev,
                                                struct device_attribute *attr,
                                                const char * buf, size_t count)
 {
+       long tmp;
        struct w1_master *md = dev_to_w1_master(dev);
 
+       if (strict_strtol(buf, 0, &tmp) == -EINVAL)
+               return -EINVAL;
+
        mutex_lock(&md->mutex);
-       md->search_count = simple_strtol(buf, NULL, 0);
+       md->search_count = tmp;
        mutex_unlock(&md->mutex);
        wake_up_process(md->thread);
 
@@ -270,6 +274,38 @@ static ssize_t w1_master_attribute_show_search(struct device *dev,
        return count;
 }
 
+static ssize_t w1_master_attribute_store_pullup(struct device *dev,
+                                               struct device_attribute *attr,
+                                               const char *buf, size_t count)
+{
+       long tmp;
+       struct w1_master *md = dev_to_w1_master(dev);
+
+       if (strict_strtol(buf, 0, &tmp) == -EINVAL)
+               return -EINVAL;
+
+       mutex_lock(&md->mutex);
+       md->enable_pullup = tmp;
+       mutex_unlock(&md->mutex);
+       wake_up_process(md->thread);
+
+       return count;
+}
+
+static ssize_t w1_master_attribute_show_pullup(struct device *dev,
+                                              struct device_attribute *attr,
+                                              char *buf)
+{
+       struct w1_master *md = dev_to_w1_master(dev);
+       ssize_t count;
+
+       mutex_lock(&md->mutex);
+       count = sprintf(buf, "%d\n", md->enable_pullup);
+       mutex_unlock(&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 = dev_to_w1_master(dev);
@@ -365,6 +401,7 @@ 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 W1_MASTER_ATTR_RW(pullup, S_IRUGO | S_IWUGO);
 
 static struct attribute *w1_master_default_attrs[] = {
        &w1_master_attribute_name.attr,
@@ -375,6 +412,7 @@ static struct attribute *w1_master_default_attrs[] = {
        &w1_master_attribute_timeout.attr,
        &w1_master_attribute_pointer.attr,
        &w1_master_attribute_search.attr,
+       &w1_master_attribute_pullup.attr,
        NULL
 };