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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>
This commit is contained in:
Daniel Mack 2010-05-18 21:49:52 +02:00 committed by Anton Vorontsov
parent 5f487cd34f
commit 0011d2d4a5
2 changed files with 40 additions and 3 deletions
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38
drivers/power/power_supply_sysfs.c
View File

@ -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;

5
include/linux/power_supply.h
View File

@ -145,6 +145,11 @@ struct power_supply {
int (*get_property)(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val);
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);
void (*external_power_changed)(struct power_supply *psy);
void (*set_charged)(struct power_supply *psy);