From 898e4bba23a5a4ff05471a9f3ae01c85d3fd5505 Mon Sep 17 00:00:00 2001 From: Philippe Langlais Date: Thu, 24 Mar 2011 14:12:01 +0100 Subject: Regulators: show consumers that holds a regulator To locate the consumer(s) that currently holds (ie have enabled) a regulator, a new sysfs entry is created. The consumer(s) are published in /sys/class/regulator/regulator.<#>/use Signed-off-by: Martin Persson Change-Id: Ief78276c9685d0bf5688294b9aed9e0698c3475f Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/6549 Reviewed-by: Bengt JONSSON Conflicts: drivers/regulator/core.c --- drivers/regulator/core.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) (limited to 'drivers') diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index d3e38790906..a47238d1fe1 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -78,6 +78,7 @@ struct regulator { char *supply_name; struct device_attribute dev_attr; struct regulator_dev *rdev; + int use; }; static int _regulator_is_enabled(struct regulator_dev *rdev); @@ -563,6 +564,32 @@ static ssize_t regulator_suspend_standby_state_show(struct device *dev, static DEVICE_ATTR(suspend_standby_state, 0444, regulator_suspend_standby_state_show, NULL); +static ssize_t regulator_use_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct regulator_dev *rdev = dev_get_drvdata(dev); + struct regulator *reg; + size_t size = 0; + + if (rdev->use_count == 0) + return sprintf(buf, "no users\n"); + + list_for_each_entry(reg, &rdev->consumer_list, list) { + if (!reg->use) + continue; + + if (reg->dev != NULL) + size += sprintf((buf + size), "%s (%d) ", + dev_name(reg->dev), reg->use); + else + size += sprintf((buf + size), "unknown (%d) ", + reg->use); + } + size += sprintf((buf + size), "\n"); + + return size; +} +static DEVICE_ATTR(use, 0444, regulator_use_show, NULL); /* * These are the only attributes are present for all regulators. @@ -1391,6 +1418,9 @@ int regulator_enable(struct regulator *regulator) mutex_lock(&rdev->mutex); ret = _regulator_enable(rdev); mutex_unlock(&rdev->mutex); + if (ret == 0) + regulator->use++; + return ret; } EXPORT_SYMBOL_GPL(regulator_enable); @@ -1474,6 +1504,9 @@ int regulator_disable(struct regulator *regulator) mutex_unlock(&rdev->mutex); } + if (ret == 0) + regulator->use--; + return ret; } EXPORT_SYMBOL_GPL(regulator_disable); @@ -2408,6 +2441,10 @@ static int add_regulator_attributes(struct regulator_dev *rdev) struct regulator_ops *ops = rdev->desc->ops; int status = 0; + status = device_create_file(dev, &dev_attr_use); + if (status < 0) + dev_warn(dev, "Create sysfs file \"use\" failed"); + /* some attributes need specific methods to be displayed */ if (ops->get_voltage || ops->get_voltage_sel) { status = device_create_file(dev, &dev_attr_microvolts); -- cgit v1.2.3