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Date: Wed, 6 Oct 2010 00:09:39 +0200
From: Linus Walleij <linus.ml.walleij@...il.com>
To: Alan Cox <alan@...rguk.ukuu.org.uk>
Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Igor Grinberg <grinberg@...pulab.co.il>,
Marek Vasut <marek.vasut@...il.com>,
linux-arm-kernel@...ts.infradead.org, vapier@...too.org,
khilman@...prootsystems.com, linux-kernel@...r.kernel.org,
pavel@....cz, linux-input@...r.kernel.org, eric.y.miao@...il.com,
akpm@...ux-foundation.org
Subject: Re: [PATCH v2] Input: Make ADS7846 independent on regulator
2010/10/5 Alan Cox <alan@...rguk.ukuu.org.uk>:
> I actually see two ways of attacking that, one is that the dummy
> regulator *and* the compiled in regulator system have a standard
> regulator value that can be passed which means "report success, move
> along nothing to see" that could be passed into drivers,
Something like this patch series? If people like it I'll test it a bit
more and submit this 2-patch series.
From: Linus Walleij <linus.walleij@...ricsson.com>
Date: Tue, 5 Oct 2010 23:23:47 +0200
Subject: [PATCH 1/2] regulator: add a relaxed regulor_try_get()
This wrapper function will accept non-existing regulators and
not treat them as errors. Consumers will have to NULL-check their
regulators.
Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
---
include/linux/regulator/consumer.h | 20 ++++++++++++++++++++
1 files changed, 20 insertions(+), 0 deletions(-)
diff --git a/include/linux/regulator/consumer.h
b/include/linux/regulator/consumer.h
index ebd7472..6ee7fdc 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -36,6 +36,7 @@
#define __LINUX_REGULATOR_CONSUMER_H_
#include <linux/device.h>
+#include <linux/err.h>
/*
* Regulator operating modes.
@@ -297,4 +298,23 @@ static inline void regulator_set_drvdata(struct
regulator *regulator,
#endif
+/*
+ * Try to get a regulator, if it fails, no big deal.
+ * This wrapper function is intended to be used for code
+ * where regulator control is optional for the particular
+ * consumer, but still the regulator framework may be in
+ * use for other things in the platform.
+ */
+static inline struct regulator *regulator_try_get(struct device *dev,
+ const char *id)
+{
+ struct regulator *reg = regulator_get(dev, id);
+
+ /* It's just that this regulator is not (yet) defined */
+ if (IS_ERR(reg) && PTR_ERR(reg) == -ENODEV)
+ return NULL;
+
+ return reg;
+}
+
#endif
--
1.7.2.3
From: Linus Walleij <linus.walleij@...ricsson.com>
Date: Wed, 6 Oct 2010 00:04:25 +0200
Subject: [PATCH 2/2] regulator: handle NULL regulators in core
If the user has selected to use regulator_try_get() to fetch
regulators, we bail out of consumer operations if the regulator
happens to be NULL.
Signed-off-by: Linus Walleij <linus.walleij@...ricsson.com>
---
drivers/regulator/core.c | 64 +++++++++++++++++++++++++++++++++++++++------
1 files changed, 55 insertions(+), 9 deletions(-)
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index cc8b337..989e4e4 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1337,9 +1337,12 @@ static int _regulator_enable(struct regulator_dev *rdev)
*/
int regulator_enable(struct regulator *regulator)
{
- struct regulator_dev *rdev = regulator->rdev;
+ struct regulator_dev *rdev;
int ret = 0;
+ if (regulator == NULL)
+ return 0;
+ rdev = regulator->rdev;
mutex_lock(&rdev->mutex);
ret = _regulator_enable(rdev);
mutex_unlock(&rdev->mutex);
@@ -1406,9 +1409,12 @@ static int _regulator_disable(struct regulator_dev *rdev)
*/
int regulator_disable(struct regulator *regulator)
{
- struct regulator_dev *rdev = regulator->rdev;
+ struct regulator_dev *rdev;
int ret = 0;
+ if (regulator == NULL)
+ return 0;
+ rdev = regulator->rdev;
mutex_lock(&rdev->mutex);
ret = _regulator_disable(rdev);
mutex_unlock(&rdev->mutex);
@@ -1456,6 +1462,8 @@ int regulator_force_disable(struct regulator *regulator)
{
int ret;
+ if (regulator == NULL)
+ return 0;
mutex_lock(®ulator->rdev->mutex);
regulator->uA_load = 0;
ret = _regulator_force_disable(regulator->rdev);
@@ -1489,6 +1497,8 @@ int regulator_is_enabled(struct regulator *regulator)
{
int ret;
+ if (regulator == NULL)
+ return 1;
mutex_lock(®ulator->rdev->mutex);
ret = _regulator_is_enabled(regulator->rdev);
mutex_unlock(®ulator->rdev->mutex);
@@ -1507,8 +1517,11 @@ EXPORT_SYMBOL_GPL(regulator_is_enabled);
*/
int regulator_count_voltages(struct regulator *regulator)
{
- struct regulator_dev *rdev = regulator->rdev;
+ struct regulator_dev *rdev;
+ if (regulator == NULL)
+ return 0;
+ rdev = regulator->rdev;
return rdev->desc->n_voltages ? : -EINVAL;
}
EXPORT_SYMBOL_GPL(regulator_count_voltages);
@@ -1525,10 +1538,15 @@ EXPORT_SYMBOL_GPL(regulator_count_voltages);
*/
int regulator_list_voltage(struct regulator *regulator, unsigned selector)
{
- struct regulator_dev *rdev = regulator->rdev;
- struct regulator_ops *ops = rdev->desc->ops;
+ struct regulator_dev *rdev;
+ struct regulator_ops *ops;
int ret;
+ if (regulator == NULL)
+ return 0;
+ rdev = regulator->rdev;
+ ops = rdev->desc->ops;
+
if (!ops->list_voltage || selector >= rdev->desc->n_voltages)
return -EINVAL;
@@ -1561,6 +1579,8 @@ int regulator_is_supported_voltage(struct
regulator *regulator,
{
int i, voltages, ret;
+ if (regulator == NULL)
+ return 0;
ret = regulator_count_voltages(regulator);
if (ret < 0)
return ret;
@@ -1596,9 +1616,12 @@ int regulator_is_supported_voltage(struct
regulator *regulator,
*/
int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
{
- struct regulator_dev *rdev = regulator->rdev;
+ struct regulator_dev *rdev;
int ret;
+ if (regulator == NULL)
+ return 0;
+ rdev = regulator->rdev;
mutex_lock(&rdev->mutex);
/* sanity check */
@@ -1644,6 +1667,9 @@ int regulator_get_voltage(struct regulator *regulator)
{
int ret;
+ if (regulator == NULL)
+ return 0;
+
mutex_lock(®ulator->rdev->mutex);
ret = _regulator_get_voltage(regulator->rdev);
@@ -1673,9 +1699,13 @@ EXPORT_SYMBOL_GPL(regulator_get_voltage);
int regulator_set_current_limit(struct regulator *regulator,
int min_uA, int max_uA)
{
- struct regulator_dev *rdev = regulator->rdev;
+ struct regulator_dev *rdev;
int ret;
+ if (regulator == NULL)
+ return 0;
+ rdev = regulator->rdev;
+
mutex_lock(&rdev->mutex);
/* sanity check */
@@ -1725,6 +1755,8 @@ out:
*/
int regulator_get_current_limit(struct regulator *regulator)
{
+ if (regulator == NULL)
+ return 0;
return _regulator_get_current_limit(regulator->rdev);
}
EXPORT_SYMBOL_GPL(regulator_get_current_limit);
@@ -1742,10 +1774,14 @@ EXPORT_SYMBOL_GPL(regulator_get_current_limit);
*/
int regulator_set_mode(struct regulator *regulator, unsigned int mode)
{
- struct regulator_dev *rdev = regulator->rdev;
+ struct regulator_dev *rdev;
int ret;
int regulator_curr_mode;
+ if (regulator == NULL)
+ return 0;
+ rdev = regulator->rdev;
+
mutex_lock(&rdev->mutex);
/* sanity check */
@@ -1801,6 +1837,8 @@ out:
*/
unsigned int regulator_get_mode(struct regulator *regulator)
{
+ if (regulator == NULL)
+ return REGULATOR_MODE_NORMAL;
return _regulator_get_mode(regulator->rdev);
}
EXPORT_SYMBOL_GPL(regulator_get_mode);
@@ -1833,11 +1871,15 @@ EXPORT_SYMBOL_GPL(regulator_get_mode);
*/
int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
{
- struct regulator_dev *rdev = regulator->rdev;
+ struct regulator_dev *rdev;
struct regulator *consumer;
int ret, output_uV, input_uV, total_uA_load = 0;
unsigned int mode;
+ if (regulator == NULL)
+ return REGULATOR_MODE_NORMAL;
+ rdev = regulator->rdev;
+
mutex_lock(&rdev->mutex);
regulator->uA_load = uA_load;
@@ -1907,6 +1949,8 @@ EXPORT_SYMBOL_GPL(regulator_set_optimum_mode);
int regulator_register_notifier(struct regulator *regulator,
struct notifier_block *nb)
{
+ if (regulator == NULL)
+ return 0;
return blocking_notifier_chain_register(®ulator->rdev->notifier,
nb);
}
@@ -1922,6 +1966,8 @@ EXPORT_SYMBOL_GPL(regulator_register_notifier);
int regulator_unregister_notifier(struct regulator *regulator,
struct notifier_block *nb)
{
+ if (regulator == NULL)
+ return 0;
return blocking_notifier_chain_unregister(®ulator->rdev->notifier,
nb);
}
--
1.7.2.3
Yours,
Linus Walleij
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