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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2011-12-07 11:24:20 -0800 |
|---|---|---|
| committer | Jeremy Fitzhardinge <jeremy@goop.org> | 2011-12-09 09:42:05 -0800 |
| commit | 25a0bc2dfc2ea732f40af2dae52426ead66ae76e (patch) | |
| tree | 180dc7e4122da2f40b241c5e936a0668420f4bb7 /drivers/power | |
| parent | cfcfc9eca2bcbd26a8e206baeb005b055dbf8e37 (diff) | |
| download | linux-25a0bc2dfc2ea732f40af2dae52426ead66ae76e.tar.bz2 | |
power_supply: add SCOPE attribute to power supplies
This adds a "scope" attribute to a power_supply, which indicates how
much of the system it powers. It appears in sysfs as "scope" or in
the uevent file as POWER_SUPPLY_SCOPE=. There are presently three
possible values:
Unknown - unknown power topology
System - the power supply powers the whole system
Device - it powers a specific device, or tree of devices
A power supply which doesn't have a "scope" attribute should be assumed to
have "System" scope.
In general, usermode should assume that loss of all System-scoped power
supplies will power off the whole system, but any single one is sufficient
to power the system.
Signed-off-by: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Richard Hughes <richard@hughsie.com>
Diffstat (limited to 'drivers/power')
| -rw-r--r-- | drivers/power/power_supply_sysfs.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c index e15d4c9d3988..21178ebfe51a 100644 --- a/drivers/power/power_supply_sysfs.c +++ b/drivers/power/power_supply_sysfs.c @@ -63,6 +63,9 @@ static ssize_t power_supply_show_property(struct device *dev, static char *capacity_level_text[] = { "Unknown", "Critical", "Low", "Normal", "High", "Full" }; + static char *scope_text[] = { + "Unknown", "System", "Device" + }; ssize_t ret = 0; struct power_supply *psy = dev_get_drvdata(dev); const ptrdiff_t off = attr - power_supply_attrs; @@ -95,6 +98,8 @@ static ssize_t power_supply_show_property(struct device *dev, return sprintf(buf, "%s\n", capacity_level_text[value.intval]); else if (off == POWER_SUPPLY_PROP_TYPE) return sprintf(buf, "%s\n", type_text[value.intval]); + else if (off == POWER_SUPPLY_PROP_SCOPE) + return sprintf(buf, "%s\n", scope_text[value.intval]); else if (off >= POWER_SUPPLY_PROP_MODEL_NAME) return sprintf(buf, "%s\n", value.strval); @@ -167,6 +172,7 @@ static struct device_attribute power_supply_attrs[] = { POWER_SUPPLY_ATTR(time_to_full_now), POWER_SUPPLY_ATTR(time_to_full_avg), POWER_SUPPLY_ATTR(type), + POWER_SUPPLY_ATTR(scope), /* Properties of type `const char *' */ POWER_SUPPLY_ATTR(model_name), POWER_SUPPLY_ATTR(manufacturer), |