commit 40f9244f4da8976eeb6d5ed6313c635ba238a9d3
author Mark Brown <broonie@opensource.wolfsonmicro.com> Wed Jun 17 17:56:39 2009 +0100
committer Liam Girdwood <lrg@slimlogic.co.uk> Tue Sep 22 13:32:36 2009 +0100
tree ced24007caae264ca2423a5b968fb13af230e413
parent a5d2abce4373810c0109c5939c0094ac16698625

regulator: Allow consumer supplies to be set up with dev_name()

Follow the approach suggested by Russell King and implemented by him in
the clkdev API and allow consumer device supply mapings to be set up
using the dev_name() for the consumer instead of the struct device.
In order to avoid making existing machines instabuggy and creating merge
issues the use of struct device is still supported for the time being.

This resolves problems working with buses such as I2C which make the
struct device available late providing that the final device name is
known, which is the case for most embedded systems with fixed setups.

Consumers must still use the struct device when calling regulator_get().

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

drivers/regulator/core.c

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 91ba9bf..24e05b7 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -37,7 +37,7 @@
  */
 struct regulator_map {
 	struct list_head list;
-	struct device *dev;
+	const char *dev_name;   /* The dev_name() for the consumer */
 	const char *supply;
 	struct regulator_dev *regulator;
 };
@@ -857,23 +857,33 @@
  * set_consumer_device_supply: Bind a regulator to a symbolic supply
  * @rdev:         regulator source
  * @consumer_dev: device the supply applies to
+ * @consumer_dev_name: dev_name() string for device supply applies to
  * @supply:       symbolic name for supply
  *
  * Allows platform initialisation code to map physical regulator
  * sources to symbolic names for supplies for use by devices.  Devices
  * should use these symbolic names to request regulators, avoiding the
  * need to provide board-specific regulator names as platform data.
+ *
+ * Only one of consumer_dev and consumer_dev_name may be specified.
  */
 static int set_consumer_device_supply(struct regulator_dev *rdev,
-	struct device *consumer_dev, const char *supply)
+	struct device *consumer_dev, const char *consumer_dev_name,
+	const char *supply)
 {
 	struct regulator_map *node;
 
+	if (consumer_dev && consumer_dev_name)
+		return -EINVAL;
+
+	if (!consumer_dev_name && consumer_dev)
+		consumer_dev_name = dev_name(consumer_dev);
+
 	if (supply == NULL)
 		return -EINVAL;
 
 	list_for_each_entry(node, &regulator_map_list, list) {
-		if (consumer_dev != node->dev)
+		if (consumer_dev_name != node->dev_name)
 			continue;
 		if (strcmp(node->supply, supply) != 0)
 			continue;
@@ -891,25 +901,38 @@
 		return -ENOMEM;
 
 	node->regulator = rdev;
-	node->dev = consumer_dev;
+	node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
 	node->supply = supply;
 
+	if (node->dev_name == NULL) {
+		kfree(node);
+		return -ENOMEM;
+	}
+
 	list_add(&node->list, &regulator_map_list);
 	return 0;
 }
 
 static void unset_consumer_device_supply(struct regulator_dev *rdev,
-	struct device *consumer_dev)
+	const char *consumer_dev_name, struct device *consumer_dev)
 {
 	struct regulator_map *node, *n;
 
+	if (consumer_dev && !consumer_dev_name)
+		consumer_dev_name = dev_name(consumer_dev);
+
 	list_for_each_entry_safe(node, n, &regulator_map_list, list) {
-		if (rdev == node->regulator &&
-			consumer_dev == node->dev) {
-			list_del(&node->list);
-			kfree(node);
-			return;
-		}
+		if (rdev != node->regulator)
+			continue;
+
+		if (consumer_dev_name && node->dev_name &&
+		    strcmp(consumer_dev_name, node->dev_name))
+			continue;
+
+		list_del(&node->list);
+		kfree(node->dev_name);
+		kfree(node);
+		return;
 	}
 }
 
@@ -920,6 +943,7 @@
 	list_for_each_entry_safe(node, n, &regulator_map_list, list) {
 		if (rdev == node->regulator) {
 			list_del(&node->list);
+			kfree(node->dev_name);
 			kfree(node);
 			return;
 		}
@@ -1019,17 +1043,25 @@
 	struct regulator_dev *rdev;
 	struct regulator_map *map;
 	struct regulator *regulator = ERR_PTR(-ENODEV);
+	const char *devname = NULL;
 
 	if (id == NULL) {
 		printk(KERN_ERR "regulator: get() with no identifier\n");
 		return regulator;
 	}
 
+	if (dev)
+		devname = dev_name(dev);
+
 	mutex_lock(&regulator_list_mutex);
 
 	list_for_each_entry(map, &regulator_map_list, list) {
-		if (dev == map->dev &&
-		    strcmp(map->supply, id) == 0) {
+		/* If the mapping has a device set up it must match */
+		if (map->dev_name &&
+		    (!devname || strcmp(map->dev_name, devname)))
+			continue;
+
+		if (strcmp(map->supply, id) == 0) {
 			rdev = map->regulator;
 			goto found;
 		}
@@ -2091,11 +2123,13 @@
 	for (i = 0; i < init_data->num_consumer_supplies; i++) {
 		ret = set_consumer_device_supply(rdev,
 			init_data->consumer_supplies[i].dev,
+			init_data->consumer_supplies[i].dev_name,
 			init_data->consumer_supplies[i].supply);
 		if (ret < 0) {
 			for (--i; i >= 0; i--)
 				unset_consumer_device_supply(rdev,
-					init_data->consumer_supplies[i].dev);
+				    init_data->consumer_supplies[i].dev_name,
+				    init_data->consumer_supplies[i].dev);
 			goto scrub;
 		}
 	}