[BATTERY] Universal power supply class (was: battery class)
This class is result of "external power" and "battery" classes merge,
as suggested by David Woodhouse. He also implemented uevent support.
Here how userspace seeing it now:
# ls /sys/class/power\ supply/
ac main-battery usb
# cat /sys/class/power\ supply/ac/type
AC
# cat /sys/class/power\ supply/usb/type
USB
# cat /sys/class/power\ supply/main-battery/type
Battery
# cat /sys/class/power\ supply/ac/online
1
# cat /sys/class/power\ supply/usb/online
0
# cat /sys/class/power\ supply/main-battery/status
Charging
# cat /sys/class/leds/h5400\:red-left/trigger
none h5400-radio timer hwtimer ac-online usb-online
main-battery-charging-or-full [main-battery-charging]
main-battery-full
Signed-off-by: Anton Vorontsov <cbou@mail.ru>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Anton Vorontsov
committed by
David Woodhouse
David Woodhouse
parent
7dcca30a32
commit
4a11b59d82
299
drivers/power/power_supply_sysfs.c
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299
drivers/power/power_supply_sysfs.c
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@@ -0,0 +1,299 @@
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/*
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* Sysfs interface for the universal power supply monitor class
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*
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* Copyright © 2007 David Woodhouse <dwmw2@infradead.org>
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* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
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* Copyright © 2004 Szabolcs Gyurko
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* Copyright © 2003 Ian Molton <spyro@f2s.com>
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*
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* Modified: 2004, Oct Szabolcs Gyurko
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*
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* You may use this code as per GPL version 2
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*/
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#include <linux/ctype.h>
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#include <linux/power_supply.h>
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/*
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* This is because the name "current" breaks the device attr macro.
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* The "current" word resolves to "(get_current())" so instead of
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* "current" "(get_current())" appears in the sysfs.
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*
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* The source of this definition is the device.h which calls __ATTR
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* macro in sysfs.h which calls the __stringify macro.
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*
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* Only modification that the name is not tried to be resolved
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* (as a macro let's say).
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*/
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#define POWER_SUPPLY_ATTR(_name) \
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{ \
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.attr = { .name = #_name, .mode = 0444, .owner = THIS_MODULE }, \
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.show = power_supply_show_property, \
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.store = NULL, \
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}
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static struct device_attribute power_supply_attrs[];
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static ssize_t power_supply_show_property(struct device *dev,
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struct device_attribute *attr,
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char *buf) {
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static char *status_text[] = {
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"Unknown", "Charging", "Discharging", "Not charging", "Full"
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};
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static char *health_text[] = {
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"Unknown", "Good", "Overheat", "Dead", "Over voltage",
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"Unspecified failure"
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};
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static char *technology_text[] = {
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"Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd"
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};
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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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ssize_t ret;
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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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union power_supply_propval value;
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ret = psy->get_property(psy, off, &value);
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if (ret < 0) {
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if (ret != -ENODEV)
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dev_err(dev, "driver failed to report `%s' property\n",
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attr->attr.name);
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return ret;
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}
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if (off == POWER_SUPPLY_PROP_STATUS)
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return sprintf(buf, "%s\n", status_text[value.intval]);
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else if (off == POWER_SUPPLY_PROP_HEALTH)
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return sprintf(buf, "%s\n", health_text[value.intval]);
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else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
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return sprintf(buf, "%s\n", technology_text[value.intval]);
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else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
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return sprintf(buf, "%s\n",
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capacity_level_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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return sprintf(buf, "%d\n", value.intval);
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}
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/* Must be in the same order as POWER_SUPPLY_PROP_* */
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static struct device_attribute power_supply_attrs[] = {
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/* Properties of type `int' */
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POWER_SUPPLY_ATTR(status),
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POWER_SUPPLY_ATTR(health),
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POWER_SUPPLY_ATTR(present),
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POWER_SUPPLY_ATTR(online),
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POWER_SUPPLY_ATTR(technology),
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POWER_SUPPLY_ATTR(voltage_max_design),
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POWER_SUPPLY_ATTR(voltage_min_design),
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POWER_SUPPLY_ATTR(voltage_now),
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POWER_SUPPLY_ATTR(voltage_avg),
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POWER_SUPPLY_ATTR(current_now),
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POWER_SUPPLY_ATTR(current_avg),
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POWER_SUPPLY_ATTR(charge_full_design),
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POWER_SUPPLY_ATTR(charge_empty_design),
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POWER_SUPPLY_ATTR(charge_full),
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POWER_SUPPLY_ATTR(charge_empty),
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POWER_SUPPLY_ATTR(charge_now),
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POWER_SUPPLY_ATTR(charge_avg),
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POWER_SUPPLY_ATTR(energy_full_design),
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POWER_SUPPLY_ATTR(energy_empty_design),
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POWER_SUPPLY_ATTR(energy_full),
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POWER_SUPPLY_ATTR(energy_empty),
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POWER_SUPPLY_ATTR(energy_now),
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POWER_SUPPLY_ATTR(energy_avg),
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POWER_SUPPLY_ATTR(capacity),
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POWER_SUPPLY_ATTR(capacity_level),
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POWER_SUPPLY_ATTR(temp),
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POWER_SUPPLY_ATTR(temp_ambient),
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POWER_SUPPLY_ATTR(time_to_empty_now),
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POWER_SUPPLY_ATTR(time_to_empty_avg),
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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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/* 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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};
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static ssize_t power_supply_show_static_attrs(struct device *dev,
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struct device_attribute *attr,
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char *buf) {
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static char *type_text[] = { "Battery", "UPS", "Mains", "USB" };
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struct power_supply *psy = dev_get_drvdata(dev);
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return sprintf(buf, "%s\n", type_text[psy->type]);
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}
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static struct device_attribute power_supply_static_attrs[] = {
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__ATTR(type, 0444, power_supply_show_static_attrs, NULL),
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};
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int power_supply_create_attrs(struct power_supply *psy)
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{
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int rc = 0;
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int i, j;
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for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) {
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rc = device_create_file(psy->dev,
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&power_supply_static_attrs[i]);
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if (rc)
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goto statics_failed;
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}
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for (j = 0; j < psy->num_properties; j++) {
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rc = device_create_file(psy->dev,
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&power_supply_attrs[psy->properties[j]]);
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if (rc)
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goto dynamics_failed;
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}
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goto succeed;
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dynamics_failed:
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while (j--)
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device_remove_file(psy->dev,
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&power_supply_attrs[psy->properties[j]]);
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statics_failed:
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while (i--)
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device_remove_file(psy->dev,
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&power_supply_static_attrs[psy->properties[i]]);
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succeed:
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return rc;
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}
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void power_supply_remove_attrs(struct power_supply *psy)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++)
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device_remove_file(psy->dev,
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&power_supply_static_attrs[i]);
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for (i = 0; i < psy->num_properties; i++)
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device_remove_file(psy->dev,
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&power_supply_attrs[psy->properties[i]]);
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return;
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}
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static char *kstruprdup(const char *str, gfp_t gfp)
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{
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char *ret, *ustr;
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ustr = ret = kmalloc(strlen(str) + 1, gfp);
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if (!ret)
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return NULL;
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while (*str)
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*ustr++ = toupper(*str++);
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*ustr = 0;
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return ret;
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}
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int power_supply_uevent(struct device *dev, char **envp, int num_envp,
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char *buffer, int buffer_size)
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{
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struct power_supply *psy = dev_get_drvdata(dev);
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int i = 0, length = 0, ret = 0, j;
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char *prop_buf;
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char *attrname;
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dev_dbg(dev, "uevent\n");
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if (!psy) {
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dev_dbg(dev, "No power supply yet\n");
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return ret;
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}
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dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
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ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
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&length, "POWER_SUPPLY_NAME=%s", psy->name);
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if (ret)
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return ret;
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prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
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if (!prop_buf)
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return -ENOMEM;
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for (j = 0; j < ARRAY_SIZE(power_supply_static_attrs); j++) {
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struct device_attribute *attr;
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char *line;
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attr = &power_supply_static_attrs[j];
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ret = power_supply_show_static_attrs(dev, attr, prop_buf);
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if (ret < 0)
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goto out;
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line = strchr(prop_buf, '\n');
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if (line)
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*line = 0;
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attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
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if (!attrname) {
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ret = -ENOMEM;
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goto out;
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}
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dev_dbg(dev, "Static prop %s=%s\n", attrname, prop_buf);
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ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
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&length, "POWER_SUPPLY_%s=%s",
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attrname, prop_buf);
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kfree(attrname);
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if (ret)
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goto out;
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}
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dev_dbg(dev, "%zd dynamic props\n", psy->num_properties);
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for (j = 0; j < psy->num_properties; j++) {
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struct device_attribute *attr;
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char *line;
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attr = &power_supply_attrs[psy->properties[j]];
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ret = power_supply_show_property(dev, attr, prop_buf);
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if (ret == -ENODEV) {
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/* When a battery is absent, we expect -ENODEV. Don't abort;
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send the uevent with at least the the PRESENT=0 property */
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ret = 0;
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continue;
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}
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if (ret < 0)
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goto out;
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line = strchr(prop_buf, '\n');
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if (line)
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*line = 0;
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attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
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if (!attrname) {
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ret = -ENOMEM;
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goto out;
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}
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dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
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ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
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&length, "POWER_SUPPLY_%s=%s",
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attrname, prop_buf);
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kfree(attrname);
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if (ret)
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goto out;
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}
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out:
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free_page((unsigned long)prop_buf);
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return ret;
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}
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