The following changes since commit 204f78ec75e6888bbf1a7b5a3ed0cbfff9bade27:
Tobias Klauser (1):
regulator/lp3971: Storage class should be before const qualifier
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator-2.6.git for-lrg
A couple of new APIs, plus a use of one of them.
Mark Brown (3):
regulator: Add notifier event on regulator disable
regulator: Allow regulators to specify the time taken to ramp on enable
regulator: Implement enable_time() for WM835x ISINKs
drivers/regulator/core.c | 48 ++++++++++++++++++++++++++++-----
drivers/regulator/wm8350-regulator.c | 46 ++++++++++++++++++++++++++++++++
include/linux/regulator/consumer.h | 4 ++-
include/linux/regulator/driver.h | 6 ++++
4 files changed, 95 insertions(+), 9 deletions(-)
The intended use case is for drivers which disable regulators to save
power but need to do some work to restore the hardware state when
restarting. If the supplies are not actually disabled due to board
limits or sharing with other active devices this notifier allows the
driver to avoid unneeded reinitialisation, particularly when used with
runtime PM.
Signed-off-by: Mark Brown <[email protected]>
---
drivers/regulator/core.c | 7 +++++--
include/linux/regulator/consumer.h | 4 +++-
2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 686ef27..cce76a8 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1341,6 +1341,9 @@ static int _regulator_disable(struct regulator_dev *rdev)
__func__, rdev_get_name(rdev));
return ret;
}
+
+ _notifier_call_chain(rdev, REGULATOR_EVENT_DISABLE,
+ NULL);
}
/* decrease our supplies ref count and disable if required */
@@ -1399,8 +1402,8 @@ static int _regulator_force_disable(struct regulator_dev *rdev)
return ret;
}
/* notify other consumers that power has been forced off */
- _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE,
- NULL);
+ _notifier_call_chain(rdev, REGULATOR_EVENT_FORCE_DISABLE |
+ REGULATOR_EVENT_DISABLE, NULL);
}
/* decrease our supplies ref count and disable if required */
diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index 030d922..28c9fd0 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -89,8 +89,9 @@
* REGULATION_OUT Regulator output is out of regulation.
* FAIL Regulator output has failed.
* OVER_TEMP Regulator over temp.
- * FORCE_DISABLE Regulator shut down by software.
+ * FORCE_DISABLE Regulator forcibly shut down by software.
* VOLTAGE_CHANGE Regulator voltage changed.
+ * DISABLE Regulator was disabled.
*
* NOTE: These events can be OR'ed together when passed into handler.
*/
@@ -102,6 +103,7 @@
#define REGULATOR_EVENT_OVER_TEMP 0x10
#define REGULATOR_EVENT_FORCE_DISABLE 0x20
#define REGULATOR_EVENT_VOLTAGE_CHANGE 0x40
+#define REGULATOR_EVENT_DISABLE 0x80
struct regulator;
--
1.6.5.7
Regulators may sometimes take longer to enable than the control operation
used to do so, either because the regulator has ramp rate control used to
limit inrush current or because the control operation is very fast (GPIO
being the most common example of this). In order to ensure that consumers
do not rely on the regulator before it is enabled provide an enable_time()
operation and have the core delay for that time before returning to the
caller.
This is implemented as a function since the ramp rate may be specified in
voltage per unit time and therefore the time depend on the configuration.
In future it would be desirable to allow the bulk operations to run the
delays for multiple enables in parallel but this is not currently supported.
Signed-off-by: Mark Brown <[email protected]>
---
drivers/regulator/core.c | 41 ++++++++++++++++++++++++++++++++-----
include/linux/regulator/driver.h | 6 +++++
2 files changed, 41 insertions(+), 6 deletions(-)
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index cce76a8..5a3509b 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -19,6 +19,7 @@
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/suspend.h>
+#include <linux/delay.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
@@ -1084,6 +1085,13 @@ overflow_err:
return NULL;
}
+static int _regulator_get_enable_time(struct regulator_dev *rdev)
+{
+ if (!rdev->desc->ops->enable_time)
+ return 0;
+ return rdev->desc->ops->enable_time(rdev);
+}
+
/* Internal regulator request function */
static struct regulator *_regulator_get(struct device *dev, const char *id,
int exclusive)
@@ -1251,7 +1259,7 @@ static int _regulator_can_change_status(struct regulator_dev *rdev)
/* locks held by regulator_enable() */
static int _regulator_enable(struct regulator_dev *rdev)
{
- int ret;
+ int ret, delay;
/* do we need to enable the supply regulator first */
if (rdev->supply) {
@@ -1275,13 +1283,34 @@ static int _regulator_enable(struct regulator_dev *rdev)
if (!_regulator_can_change_status(rdev))
return -EPERM;
- if (rdev->desc->ops->enable) {
- ret = rdev->desc->ops->enable(rdev);
- if (ret < 0)
- return ret;
- } else {
+ if (!rdev->desc->ops->enable)
return -EINVAL;
+
+ /* Query before enabling in case configuration
+ * dependant. */
+ ret = _regulator_get_enable_time(rdev);
+ if (ret >= 0) {
+ delay = ret;
+ } else {
+ printk(KERN_WARNING
+ "%s: enable_time() failed for %s: %d\n",
+ __func__, rdev_get_name(rdev),
+ ret);
+ delay = 0;
}
+
+ /* Allow the regulator to ramp; it would be useful
+ * to extend this for bulk operations so that the
+ * regulators can ramp together. */
+ ret = rdev->desc->ops->enable(rdev);
+ if (ret < 0)
+ return ret;
+
+ if (delay >= 1000)
+ mdelay(delay / 1000);
+ else if (delay)
+ udelay(delay);
+
} else if (ret < 0) {
printk(KERN_ERR "%s: is_enabled() failed for %s: %d\n",
__func__, rdev_get_name(rdev), ret);
diff --git a/include/linux/regulator/driver.h b/include/linux/regulator/driver.h
index 31f2055..592cd7c 100644
--- a/include/linux/regulator/driver.h
+++ b/include/linux/regulator/driver.h
@@ -58,6 +58,9 @@ enum regulator_status {
* @get_optimum_mode: Get the most efficient operating mode for the regulator
* when running with the specified parameters.
*
+ * @enable_time: Time taken for the regulator voltage output voltage to
+ * stabalise after being enabled, in microseconds.
+ *
* @set_suspend_voltage: Set the voltage for the regulator when the system
* is suspended.
* @set_suspend_enable: Mark the regulator as enabled when the system is
@@ -93,6 +96,9 @@ struct regulator_ops {
int (*set_mode) (struct regulator_dev *, unsigned int mode);
unsigned int (*get_mode) (struct regulator_dev *);
+ /* Time taken to enable the regulator */
+ int (*enable_time) (struct regulator_dev *);
+
/* report regulator status ... most other accessors report
* control inputs, this reports results of combining inputs
* from Linux (and other sources) with the actual load.
--
1.6.5.7
Signed-off-by: Mark Brown <[email protected]>
---
drivers/regulator/wm8350-regulator.c | 46 ++++++++++++++++++++++++++++++++++
1 files changed, 46 insertions(+), 0 deletions(-)
diff --git a/drivers/regulator/wm8350-regulator.c b/drivers/regulator/wm8350-regulator.c
index 1bbff09..927e735 100644
--- a/drivers/regulator/wm8350-regulator.c
+++ b/drivers/regulator/wm8350-regulator.c
@@ -290,6 +290,51 @@ static int wm8350_isink_is_enabled(struct regulator_dev *rdev)
return -EINVAL;
}
+static int wm8350_isink_enable_time(struct regulator_dev *rdev)
+{
+ struct wm8350 *wm8350 = rdev_get_drvdata(rdev);
+ int isink = rdev_get_id(rdev);
+ int reg;
+
+ switch (isink) {
+ case WM8350_ISINK_A:
+ reg = wm8350_reg_read(wm8350, WM8350_CSA_FLASH_CONTROL);
+ break;
+ case WM8350_ISINK_B:
+ reg = wm8350_reg_read(wm8350, WM8350_CSB_FLASH_CONTROL);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (reg & WM8350_CS1_FLASH_MODE) {
+ switch (reg & WM8350_CS1_ON_RAMP_MASK) {
+ case 0:
+ return 0;
+ case 1:
+ return 1950;
+ case 2:
+ return 3910;
+ case 3:
+ return 7800;
+ }
+ } else {
+ switch (reg & WM8350_CS1_ON_RAMP_MASK) {
+ case 0:
+ return 0;
+ case 1:
+ return 250000;
+ case 2:
+ return 500000;
+ case 3:
+ return 1000000;
+ }
+ }
+
+ return -EINVAL;
+}
+
+
int wm8350_isink_set_flash(struct wm8350 *wm8350, int isink, u16 mode,
u16 trigger, u16 duration, u16 on_ramp, u16 off_ramp,
u16 drive)
@@ -1221,6 +1266,7 @@ static struct regulator_ops wm8350_isink_ops = {
.enable = wm8350_isink_enable,
.disable = wm8350_isink_disable,
.is_enabled = wm8350_isink_is_enabled,
+ .enable_time = wm8350_isink_enable_time,
};
static struct regulator_desc wm8350_reg[NUM_WM8350_REGULATORS] = {
--
1.6.5.7
On Mon, 2010-01-04 at 18:16 +0000, Mark Brown wrote:
> The following changes since commit 204f78ec75e6888bbf1a7b5a3ed0cbfff9bade27:
> Tobias Klauser (1):
> regulator/lp3971: Storage class should be before const qualifier
>
> are available in the git repository at:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator-2.6.git for-lrg
>
> A couple of new APIs, plus a use of one of them.
>
> Mark Brown (3):
> regulator: Add notifier event on regulator disable
> regulator: Allow regulators to specify the time taken to ramp on enable
> regulator: Implement enable_time() for WM835x ISINKs
>
> drivers/regulator/core.c | 48 ++++++++++++++++++++++++++++-----
> drivers/regulator/wm8350-regulator.c | 46 ++++++++++++++++++++++++++++++++
> include/linux/regulator/consumer.h | 4 ++-
> include/linux/regulator/driver.h | 6 ++++
> 4 files changed, 95 insertions(+), 9 deletions(-)
> --
Pulled.
Thanks
Liam