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Message-Id: <1331813073-714-1-git-send-email-horms@verge.net.au>
Date: Thu, 15 Mar 2012 21:04:33 +0900
From: Simon Horman <horms@...ge.net.au>
To: Liam Girdwood <lrg@...com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc: linux-kernel@...r.kernel.org, Simon Horman <horms@...ge.net.au>
Subject: [PATCH] regulator: notify sysfs when voltage is set
This allows libudev to be used to monitor voltage changes and thus allows
user-space code to avoid polling the sysfs entry for changes.
Signed-off-by: Simon Horman <horms@...ge.net.au>
---
drivers/regulator/core.c | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index b97c4a2..f3905b0 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1783,6 +1783,19 @@ int regulator_is_supported_voltage(struct regulator *regulator,
}
EXPORT_SYMBOL_GPL(regulator_is_supported_voltage);
+static void regulator_generate_event(struct regulator_dev *rdev)
+{
+ char buf[32], *envp[2];
+
+ sprintf(buf, "MICROVOLTS=%d", _regulator_get_voltage(rdev));
+
+ envp[0] = buf;
+ envp[1] = NULL;
+
+ kobject_uevent_env(&rdev->dev.kobj, KOBJ_CHANGE, envp);
+ sysfs_notify(&rdev->dev.kobj, NULL, "microvolts");
+}
+
static int _regulator_do_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV)
{
@@ -1862,6 +1875,8 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
udelay(delay);
}
+ regulator_generate_event(rdev);
+
if (ret == 0)
_notifier_call_chain(rdev, REGULATOR_EVENT_VOLTAGE_CHANGE,
NULL);
--
1.7.6.3
--
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