To locate the consumers that currently hold a regulator we're creating a new sysfs entry. The consumers are published in /sys/class/regulator/regulator.<#>/use
Signed-off-by: Lee Jones <[email protected]> --- drivers/regulator/core.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 2785843..81212c7 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -85,6 +85,7 @@ struct regulator { struct device_attribute dev_attr; struct regulator_dev *rdev; struct dentry *debugfs; + int use; }; static int _regulator_is_enabled(struct regulator_dev *rdev); @@ -614,6 +615,33 @@ static ssize_t regulator_bypass_show(struct device *dev, static DEVICE_ATTR(bypass, 0444, regulator_bypass_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. * Other attributes are a function of regulator functionality. @@ -1564,6 +1592,8 @@ int regulator_enable(struct regulator *regulator) if (ret != 0 && rdev->supply) regulator_disable(rdev->supply); + else + regulator->use++; return ret; } @@ -1656,6 +1686,9 @@ int regulator_disable(struct regulator *regulator) if (ret == 0 && rdev->supply) regulator_disable(rdev->supply); + if (ret == 0) + regulator->use--; + return ret; } EXPORT_SYMBOL_GPL(regulator_disable); @@ -3190,6 +3223,10 @@ 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) + return status; + /* some attributes need specific methods to be displayed */ if ((ops->get_voltage && ops->get_voltage(rdev) >= 0) || (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0) || -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
