Messages in this thread Patch in this message | | | From | Daniel Drake <> | Subject | [PATCH 1/2] power_supply: allow control of attribute visibility | Date | Mon, 6 Dec 2010 20:35:01 +0000 (GMT) |
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A power supply driver could support a certain attribute that is not available at runtime (e.g. because the specific host doesn't support that functionality).
Add a mechanism for power supplies to be able to specify this.
Signed-off-by: Daniel Drake <dsd@laptop.org> --- drivers/power/power_supply_sysfs.c | 4 ++++ include/linux/power_supply.h | 2 ++ 2 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c index cd1f907..8df9e4c 100644 --- a/drivers/power/power_supply_sysfs.c +++ b/drivers/power/power_supply_sysfs.c @@ -191,6 +191,10 @@ static mode_t power_supply_attr_is_visible(struct kobject *kobj, int property = psy->properties[i]; if (property == attrno) { + if (psy->property_is_available && + !psy->property_is_available(psy, property)) + return 0; + if (psy->property_is_writeable && psy->property_is_writeable(psy, property) > 0) mode |= S_IWUSR; diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h index 7d73256..b481458 100644 --- a/include/linux/power_supply.h +++ b/include/linux/power_supply.h @@ -152,6 +152,8 @@ struct power_supply { int (*set_property)(struct power_supply *psy, enum power_supply_property psp, const union power_supply_propval *val); + bool (*property_is_available)(struct power_supply *psy, + enum power_supply_property psp); int (*property_is_writeable)(struct power_supply *psy, enum power_supply_property psp); void (*external_power_changed)(struct power_supply *psy); -- 1.7.3.2
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