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Date: Mon, 1 Dec 2008 13:35:43 -0800
From: David Brownell <david-b@...bell.net>
To: Mark Brown <broonie@...ena.org.uk>, lrg@...mlogic.co.uk
Cc: lkml <linux-kernel@...r.kernel.org>
Subject: [patch 2.6.28-rc6+] regulator: bugfixes and messaging cleanup
From: David Brownell <dbrownell@...rs.sourceforge.net>
Regulator core bugfixes:
* Move regulator earlier in link sequence.
It initializes as a core_initcall() to be available early ...
but links way late, so a regulator that's at subsys_initcall()
is unavailable to subsystems which need it to initialize.
* Prevent registration of duplicate "struct regulator" names.
They'd be unavailable, and clearly indicate something wrong.
* Some debug messages were wrongly at the KERN_ERR level
Callers of regulator_get() have a fault code; messages for
invalid parameters are thus more than usually superfluous.
And messaging updates;
* Add debug messages when regulators get named and unnamed.
Otherwise there's no way to trace what's happening until
maybe a regulator_get() fails ... MUCH later.
* Ditto when they get enabled and disabled.
Same reasons.
* Make some message used dev_err() not printk(KERN_ERR ...)
Bare printk isn't as informative. (Also got rid of two
copies of one message...)
There are still messaging issues that deserve fixing: printks outside
the enable/disable paths should also use driver model calls; and more
KERN_ERR messages that should really be dev_dbg().
Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
---
Presumably needs to go over the previous enable/disable updates.
drivers/Makefile | 4 ++-
drivers/regulator/core.c | 59 +++++++++++++++++++++++++++++----------------
2 files changed, 42 insertions(+), 21 deletions(-)
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -18,6 +18,9 @@ obj-$(CONFIG_ARM_AMBA) += amba/
obj-$(CONFIG_XEN) += xen/
+# regulators early, since some subsystems rely on them to initialize
+obj-$(CONFIG_REGULATOR) += regulator/
+
# char/ comes before serial/ etc so that the VT console is the boot-time
# default.
obj-y += char/
@@ -101,5 +104,4 @@ obj-$(CONFIG_PPC_PS3) += ps3/
obj-$(CONFIG_OF) += of/
obj-$(CONFIG_SSB) += ssb/
obj-$(CONFIG_VIRTIO) += virtio/
-obj-$(CONFIG_REGULATOR) += regulator/
obj-$(CONFIG_STAGING) += staging/
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -775,6 +775,20 @@ static int set_consumer_device_supply(st
if (supply == NULL)
return -EINVAL;
+ list_for_each_entry(node, ®ulator_map_list, list) {
+ if (consumer_dev != node->dev)
+ continue;
+ if (strcmp(node->supply, supply) != 0)
+ continue;
+
+ dev_dbg(consumer_dev, "%s/%s is '%s' supply; fail %s/%s\n",
+ dev_name(&node->regulator->dev),
+ node->regulator->desc->name,
+ supply,
+ dev_name(&rdev->dev), rdev->desc->name);
+ return -EBUSY;
+ }
+
node = kmalloc(sizeof(struct regulator_map), GFP_KERNEL);
if (node == NULL)
return -ENOMEM;
@@ -783,6 +797,10 @@ static int set_consumer_device_supply(st
node->dev = consumer_dev;
node->supply = supply;
+ dev_dbg(consumer_dev, "setting up %s/%s as '%s' supply\n",
+ dev_name(&rdev->dev),
+ rdev->desc->name, supply);
+
list_add(&node->list, ®ulator_map_list);
return 0;
}
@@ -793,8 +811,11 @@ static void unset_consumer_device_supply
struct regulator_map *node, *n;
list_for_each_entry_safe(node, n, ®ulator_map_list, list) {
- if (rdev == node->regulator &&
- consumer_dev == node->dev) {
+ if (rdev == node->regulator && consumer_dev == node->dev) {
+ dev_dbg(consumer_dev,
+ "removing %s/%s as '%s' supply\n",
+ dev_name(&rdev->dev),
+ rdev->desc->name, node->supply);
list_del(&node->list);
kfree(node);
return;
@@ -894,7 +915,7 @@ struct regulator *regulator_get(struct d
struct regulator *regulator = ERR_PTR(-ENODEV);
if (id == NULL) {
- printk(KERN_ERR "regulator: get() with no identifier\n");
+ dev_dbg(dev, "regulator_get with no identifier\n");
return regulator;
}
@@ -907,8 +928,7 @@ struct regulator *regulator_get(struct d
goto found;
}
}
- printk(KERN_ERR "regulator: Unable to get requested regulator: %s\n",
- id);
+ dev_dbg(dev, "Unable to find regulator: %s\n", id);
mutex_unlock(®ulator_list_mutex);
return regulator;
@@ -971,19 +991,16 @@ static int _regulator_enable(struct regu
int ret = -EINVAL;
if (!rdev->constraints) {
- printk(KERN_ERR "%s: %s has no constraints\n",
- __func__, rdev->desc->name);
+ dev_err(&rdev->dev, "%s has no constraints\n",
+ rdev->desc->name);
return ret;
}
/* do we need to enable the supply regulator first */
if (rdev->supply) {
ret = _regulator_enable(rdev->supply);
- if (ret < 0) {
- printk(KERN_ERR "%s: failed to enable %s: %d\n",
- __func__, rdev->desc->name, ret);
- return ret;
- }
+ if (ret < 0)
+ goto fail;
}
/* check voltage and requested load before enabling */
@@ -995,15 +1012,16 @@ static int _regulator_enable(struct regu
drms_uA_update(rdev);
ret = rdev->desc->ops->enable(rdev);
- if (ret < 0) {
- printk(KERN_ERR "%s: failed to enable %s: %d\n",
- __func__, rdev->desc->name, ret);
- return ret;
+ if (ret >= 0) {
+ dev_dbg(&rdev->dev, "enabled %s\n", rdev->desc->name);
+ rdev->use_count++;
}
- rdev->use_count++;
- return ret;
}
+fail:
+ if (ret < 0)
+ dev_err(&rdev->dev, "can't enable %s: %d\n",
+ rdev->desc->name, ret);
return ret;
}
@@ -1046,10 +1064,11 @@ static int _regulator_disable(struct reg
if (rdev->desc->ops->disable) {
ret = rdev->desc->ops->disable(rdev);
if (ret < 0) {
- printk(KERN_ERR "%s: failed to disable %s\n",
- __func__, rdev->desc->name);
+ dev_err(&rdev->dev, "failed disabling %s: %d\n",
+ rdev->desc->name, ret);
return ret;
}
+ dev_dbg(&rdev->dev, "disabled %s\n", rdev->desc->name);
}
/* decrease our supplies ref count and disable if required */
--
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