[PATCH] w1: Added add/remove slave callbacks.
Patch is based on work from Ben Gardner <bgardner@wabtec.com>
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 39888af..e592ca2 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -59,19 +59,6 @@
static int control_needs_exit;
static DECLARE_COMPLETION(w1_control_complete);
-/* stuff for the default family */
-static ssize_t w1_famdefault_read_name(struct device *dev, struct device_attribute *attr, char *buf)
-{
- struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
- return(sprintf(buf, "%s\n", sl->name));
-}
-static struct w1_family_ops w1_default_fops = {
- .rname = &w1_famdefault_read_name,
-};
-static struct w1_family w1_default_family = {
- .fops = &w1_default_fops,
-};
-
static int w1_master_match(struct device *dev, struct device_driver *drv)
{
return 1;
@@ -99,30 +86,47 @@
complete(&sl->dev_released);
}
-static ssize_t w1_default_read_name(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t w1_slave_read_name(struct device *dev, struct device_attribute *attr, char *buf)
{
- return sprintf(buf, "No family registered.\n");
+ struct w1_slave *sl = dev_to_w1_slave(dev);
+
+ return sprintf(buf, "%s\n", sl->name);
}
-static ssize_t w1_default_read_bin(struct kobject *kobj, char *buf, loff_t off,
- size_t count)
+static ssize_t w1_slave_read_id(struct kobject *kobj, char *buf, loff_t off, size_t count)
{
- return sprintf(buf, "No family registered.\n");
-}
+ struct w1_slave *sl = kobj_to_w1_slave(kobj);
-static struct device_attribute w1_slave_attribute =
- __ATTR(name, S_IRUGO, w1_default_read_name, NULL);
+ atomic_inc(&sl->refcnt);
+ if (off > 8) {
+ count = 0;
+ } else {
+ if (off + count > 8)
+ count = 8 - off;
-static struct bin_attribute w1_slave_bin_attribute = {
- .attr = {
- .name = "w1_slave",
- .mode = S_IRUGO,
- .owner = THIS_MODULE,
- },
- .size = W1_SLAVE_DATA_SIZE,
- .read = &w1_default_read_bin,
+ memcpy(buf, (u8 *)&sl->reg_num, count);
+ }
+ atomic_dec(&sl->refcnt);
+
+ return count;
+ }
+
+static struct device_attribute w1_slave_attr_name =
+ __ATTR(name, S_IRUGO, w1_slave_read_name, NULL);
+
+static struct bin_attribute w1_slave_attr_bin_id = {
+ .attr = {
+ .name = "id",
+ .mode = S_IRUGO,
+ .owner = THIS_MODULE,
+ },
+ .size = 8,
+ .read = w1_slave_read_id,
};
+/* Default family */
+static struct w1_family w1_default_family;
+
static int w1_hotplug(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size);
static struct bus_type w1_bus_type = {
@@ -413,36 +417,44 @@
return err;
}
- memcpy(&sl->attr_bin, &w1_slave_bin_attribute, sizeof(sl->attr_bin));
- memcpy(&sl->attr_name, &w1_slave_attribute, sizeof(sl->attr_name));
-
- sl->attr_bin.read = sl->family->fops->rbin;
- sl->attr_name.show = sl->family->fops->rname;
-
- err = device_create_file(&sl->dev, &sl->attr_name);
+ /* 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",
sl->dev.bus_id, err);
- device_unregister(&sl->dev);
- return err;
+ goto out_unreg;
}
- if ( sl->attr_bin.read ) {
- err = sysfs_create_bin_file(&sl->dev.kobj, &sl->attr_bin);
- if (err < 0) {
- dev_err(&sl->dev,
- "sysfs file creation for [%s] failed. err=%d\n",
- sl->dev.bus_id, err);
- device_remove_file(&sl->dev, &sl->attr_name);
- device_unregister(&sl->dev);
- return err;
- }
+ /* Create "id" entry */
+ err = sysfs_create_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
+ if (err < 0) {
+ dev_err(&sl->dev,
+ "sysfs file creation for [%s] failed. err=%d\n",
+ sl->dev.bus_id, err);
+ goto out_rem1;
+ }
+
+ /* 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)) {
+ dev_err(&sl->dev,
+ "sysfs file creation for [%s] failed. err=%d\n",
+ sl->dev.bus_id, err);
+ goto out_rem2;
}
list_add_tail(&sl->w1_slave_entry, &sl->master->slist);
return 0;
+
+out_rem2:
+ sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
+out_rem1:
+ device_remove_file(&sl->dev, &w1_slave_attr_name);
+out_unreg:
+ device_unregister(&sl->dev);
+ return err;
}
static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
@@ -517,10 +529,11 @@
flush_signals(current);
}
- if ( sl->attr_bin.read ) {
- sysfs_remove_bin_file (&sl->dev.kobj, &sl->attr_bin);
- }
- device_remove_file(&sl->dev, &sl->attr_name);
+ if (sl->family->fops && sl->family->fops->remove_slave)
+ sl->family->fops->remove_slave(sl);
+
+ sysfs_remove_bin_file(&sl->dev.kobj, &w1_slave_attr_bin_id);
+ device_remove_file(&sl->dev, &w1_slave_attr_name);
device_unregister(&sl->dev);
w1_family_put(sl->family);
@@ -805,8 +818,8 @@
if (!test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags) && !--sl->ttl) {
list_del (&sl->w1_slave_entry);
- w1_slave_detach (sl);
- kfree (sl);
+ w1_slave_detach(sl);
+ kfree(sl);
dev->slave_count--;
} else if (test_bit(W1_SLAVE_ACTIVE, (unsigned long *)&sl->flags))