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>
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@ -63,6 +63,9 @@ static ssize_t power_supply_show_property(struct device *dev,
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static char *capacity_level_text[] = {
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"Unknown", "Critical", "Low", "Normal", "High", "Full"
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};
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static char *scope_text[] = {
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"Unknown", "System", "Device"
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};
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ssize_t ret = 0;
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struct power_supply *psy = dev_get_drvdata(dev);
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const ptrdiff_t off = attr - power_supply_attrs;
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@ -95,6 +98,8 @@ static ssize_t power_supply_show_property(struct device *dev,
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return sprintf(buf, "%s\n", capacity_level_text[value.intval]);
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else if (off == POWER_SUPPLY_PROP_TYPE)
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return sprintf(buf, "%s\n", type_text[value.intval]);
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else if (off == POWER_SUPPLY_PROP_SCOPE)
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return sprintf(buf, "%s\n", scope_text[value.intval]);
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else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
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return sprintf(buf, "%s\n", value.strval);
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@ -167,6 +172,7 @@ static struct device_attribute power_supply_attrs[] = {
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POWER_SUPPLY_ATTR(time_to_full_now),
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POWER_SUPPLY_ATTR(time_to_full_avg),
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POWER_SUPPLY_ATTR(type),
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POWER_SUPPLY_ATTR(scope),
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/* Properties of type `const char *' */
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POWER_SUPPLY_ATTR(model_name),
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POWER_SUPPLY_ATTR(manufacturer),
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@ -74,6 +74,12 @@ enum {
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POWER_SUPPLY_CAPACITY_LEVEL_FULL,
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};
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enum {
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POWER_SUPPLY_SCOPE_UNKNOWN = 0,
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POWER_SUPPLY_SCOPE_SYSTEM,
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POWER_SUPPLY_SCOPE_DEVICE,
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};
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enum power_supply_property {
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/* Properties of type `int' */
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POWER_SUPPLY_PROP_STATUS = 0,
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@ -116,6 +122,7 @@ enum power_supply_property {
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POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
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POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
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POWER_SUPPLY_PROP_TYPE, /* use power_supply.type instead */
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POWER_SUPPLY_PROP_SCOPE,
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/* Properties of type `const char *' */
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POWER_SUPPLY_PROP_MODEL_NAME,
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POWER_SUPPLY_PROP_MANUFACTURER,
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