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authorDaniel Mack <daniel@caiaq.de>2010-05-18 23:49:52 +0400
committerAnton Vorontsov <cbouatmailru@gmail.com>2010-05-19 12:14:42 +0400
commit0011d2d4a5f7bb5666dcfb9f9b3dbdb084ab98f1 (patch)
treec36b9e315de3978a408351968c758a5a7728f7ba /drivers/power
parent5f487cd34f4337f9bc27ca19da72a39d1b0a0ab4 (diff)
downloadlinux-0011d2d4a5f7bb5666dcfb9f9b3dbdb084ab98f1.tar.xz
power_supply: Add support for writeable properties
This patch adds support for writeable power supply properties and exposes them as writeable to sysfs. A power supply implementation must implement two new function calls in order to use that feature: int set_property(struct power_supply *psy, enum power_supply_property psp, const union power_supply_propval *val); int property_is_writeable(struct power_supply *psy, enum power_supply_property psp); Signed-off-by: Daniel Mack <daniel@caiaq.de> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Alexey Starikovskiy <astarikovskiy@suse.de> Cc: Len Brown <len.brown@intel.com> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: Matt Reimer <mreimer@vpop.net> Cc: Evgeniy Polyakov <zbr@ioremap.net> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/power_supply_sysfs.c38
1 files changed, 35 insertions, 3 deletions
diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
index 7d7593cad7d9..6a86cdfd79fa 100644
--- a/drivers/power/power_supply_sysfs.c
+++ b/drivers/power/power_supply_sysfs.c
@@ -33,7 +33,7 @@
{ \
.attr = { .name = #_name }, \
.show = power_supply_show_property, \
- .store = NULL, \
+ .store = power_supply_store_property, \
}
static struct device_attribute power_supply_attrs[];
@@ -99,6 +99,29 @@ static ssize_t power_supply_show_property(struct device *dev,
return sprintf(buf, "%d\n", value.intval);
}
+static ssize_t power_supply_store_property(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count) {
+ ssize_t ret;
+ struct power_supply *psy = dev_get_drvdata(dev);
+ const ptrdiff_t off = attr - power_supply_attrs;
+ union power_supply_propval value;
+ long long_val;
+
+ /* TODO: support other types than int */
+ ret = strict_strtol(buf, 10, &long_val);
+ if (ret < 0)
+ return ret;
+
+ value.intval = long_val;
+
+ ret = psy->set_property(psy, off, &value);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
/* Must be in the same order as POWER_SUPPLY_PROP_* */
static struct device_attribute power_supply_attrs[] = {
/* Properties of type `int' */
@@ -159,8 +182,17 @@ static mode_t power_supply_attr_is_visible(struct kobject *kobj,
int i;
for (i = 0; i < psy->num_properties; i++) {
- if (psy->properties[i] == attrno)
- return 0444;
+ int property = psy->properties[i];
+
+ if (property == attrno) {
+ mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
+
+ if (psy->property_is_writeable &&
+ psy->property_is_writeable(psy, property) > 0)
+ mode |= S_IWUSR;
+
+ return mode;
+ }
}
return 0;