From 25a0bc2dfc2ea732f40af2dae52426ead66ae76e Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Wed, 7 Dec 2011 11:24:20 -0800 Subject: 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 Cc: Richard Hughes --- drivers/power/power_supply_sysfs.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/power/power_supply_sysfs.c') 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), -- cgit v1.2.3-59-g8ed1b