diff options
| author | Philippe Langlais <philippe.langlais@linaro.org> | 2011-03-24 14:12:01 +0100 |
|---|---|---|
| committer | Philippe Langlais <philippe.langlais@stericsson.com> | 2012-05-22 10:59:05 +0200 |
| commit | 0bba339b64e4e38857940713ac3823e095bb97fc (patch) | |
| tree | a3d8eeea852e94e3fdde26fc1fbec72c6356e581 | |
| parent | ebdd5810671a63892ab3257f1a8674d1fde7bf9e (diff) | |
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 <martin.persson@stericsson.com>
Change-Id: Ief78276c9685d0bf5688294b9aed9e0698c3475f
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/6549
Reviewed-by: Bengt JONSSON <bengt.g.jonsson@stericsson.com>
Conflicts:
drivers/regulator/core.c
| -rw-r--r-- | drivers/regulator/core.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 046fb1bd861..40fd150a13c 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -81,6 +81,7 @@ 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); @@ -602,6 +603,32 @@ 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. @@ -1540,6 +1567,8 @@ int regulator_enable(struct regulator *regulator) if (ret != 0 && rdev->supply) regulator_disable(rdev->supply); + else + regulator->use++; return ret; } @@ -1613,6 +1642,9 @@ 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); @@ -2699,6 +2731,10 @@ 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(rdev) >= 0) || (ops->get_voltage_sel && ops->get_voltage_sel(rdev) >= 0)) { |