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authorDaniel Mack <daniel@caiaq.de>2010-05-18 15:49:52 -0400
committerAnton Vorontsov <cbouatmailru@gmail.com>2010-05-19 04:14:42 -0400
commit0011d2d4a5f7bb5666dcfb9f9b3dbdb084ab98f1 (patch)
treec36b9e315de3978a408351968c758a5a7728f7ba /drivers/power
parent5f487cd34f4337f9bc27ca19da72a39d1b0a0ab4 (diff)
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 @@
33{ \ 33{ \
34 .attr = { .name = #_name }, \ 34 .attr = { .name = #_name }, \
35 .show = power_supply_show_property, \ 35 .show = power_supply_show_property, \
36 .store = NULL, \ 36 .store = power_supply_store_property, \
37} 37}
38 38
39static struct device_attribute power_supply_attrs[]; 39static struct device_attribute power_supply_attrs[];
@@ -99,6 +99,29 @@ static ssize_t power_supply_show_property(struct device *dev,
99 return sprintf(buf, "%d\n", value.intval); 99 return sprintf(buf, "%d\n", value.intval);
100} 100}
101 101
102static ssize_t power_supply_store_property(struct device *dev,
103 struct device_attribute *attr,
104 const char *buf, size_t count) {
105 ssize_t ret;
106 struct power_supply *psy = dev_get_drvdata(dev);
107 const ptrdiff_t off = attr - power_supply_attrs;
108 union power_supply_propval value;
109 long long_val;
110
111 /* TODO: support other types than int */
112 ret = strict_strtol(buf, 10, &long_val);
113 if (ret < 0)
114 return ret;
115
116 value.intval = long_val;
117
118 ret = psy->set_property(psy, off, &value);
119 if (ret < 0)
120 return ret;
121
122 return count;
123}
124
102/* Must be in the same order as POWER_SUPPLY_PROP_* */ 125/* Must be in the same order as POWER_SUPPLY_PROP_* */
103static struct device_attribute power_supply_attrs[] = { 126static struct device_attribute power_supply_attrs[] = {
104 /* Properties of type `int' */ 127 /* Properties of type `int' */
@@ -159,8 +182,17 @@ static mode_t power_supply_attr_is_visible(struct kobject *kobj,
159 int i; 182 int i;
160 183
161 for (i = 0; i < psy->num_properties; i++) { 184 for (i = 0; i < psy->num_properties; i++) {
162 if (psy->properties[i] == attrno) 185 int property = psy->properties[i];
163 return 0444; 186
187 if (property == attrno) {
188 mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
189
190 if (psy->property_is_writeable &&
191 psy->property_is_writeable(psy, property) > 0)
192 mode |= S_IWUSR;
193
194 return mode;
195 }
164 } 196 }
165 197
166 return 0; 198 return 0;