![Ramakrishna Pallala](/assets/img/avatar_default.png)
There are different types of chargers avalibale like AC, Solar, USB, etc.. Even in USB we have different types SDP/DCP/CDP/ACA and all these chargers have different o/p ratings. For example SDP supports only 500mA of charge current whereas AC charger can support upto 8A or more. Similarly batteries also come with charge current and voltage ratings and these ratings vary depending on its capacity and the technology used. This patch adds two new power supply properties CONSTANT_CHARGE_CURRENT_MAX and CONSTANT_CHARGE_CURRENT_MAX. Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
326 lines
8.6 KiB
C
326 lines
8.6 KiB
C
/*
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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/device.h>
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#include <linux/power_supply.h>
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#include <linux/slab.h>
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#include <linux/stat.h>
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#include "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 }, \
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.show = power_supply_show_property, \
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.store = power_supply_store_property, \
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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 *type_text[] = {
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"Unknown", "Battery", "UPS", "Mains", "USB",
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"USB_DCP", "USB_CDP", "USB_ACA"
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};
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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 *charge_type[] = {
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"Unknown", "N/A", "Trickle", "Fast"
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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", "Cold",
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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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"LiMn"
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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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static char *scope_text[] = {
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"Unknown", "System", "Device"
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};
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ssize_t ret = 0;
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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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if (off == POWER_SUPPLY_PROP_TYPE)
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value.intval = psy->type;
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else
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ret = psy->get_property(psy, off, &value);
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if (ret < 0) {
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if (ret == -ENODATA)
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dev_dbg(dev, "driver has no data for `%s' property\n",
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attr->attr.name);
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else if (ret != -ENODEV)
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dev_err(dev, "driver failed to report `%s' property: %zd\n",
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attr->attr.name, ret);
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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_CHARGE_TYPE)
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return sprintf(buf, "%s\n", charge_type[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", capacity_level_text[value.intval]);
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else if (off == POWER_SUPPLY_PROP_TYPE)
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return sprintf(buf, "%s\n", type_text[value.intval]);
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else if (off == POWER_SUPPLY_PROP_SCOPE)
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return sprintf(buf, "%s\n", scope_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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static ssize_t power_supply_store_property(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count) {
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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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long long_val;
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/* TODO: support other types than int */
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ret = strict_strtol(buf, 10, &long_val);
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if (ret < 0)
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return ret;
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value.intval = long_val;
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ret = psy->set_property(psy, off, &value);
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if (ret < 0)
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return ret;
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return count;
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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(charge_type),
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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(authentic),
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POWER_SUPPLY_ATTR(technology),
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POWER_SUPPLY_ATTR(cycle_count),
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POWER_SUPPLY_ATTR(voltage_max),
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POWER_SUPPLY_ATTR(voltage_min),
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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(voltage_ocv),
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POWER_SUPPLY_ATTR(current_max),
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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(power_now),
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POWER_SUPPLY_ATTR(power_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(charge_counter),
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POWER_SUPPLY_ATTR(constant_charge_current),
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POWER_SUPPLY_ATTR(constant_charge_current_max),
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POWER_SUPPLY_ATTR(constant_charge_voltage),
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POWER_SUPPLY_ATTR(constant_charge_voltage_max),
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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_alert_min),
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POWER_SUPPLY_ATTR(capacity_alert_max),
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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_alert_min),
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POWER_SUPPLY_ATTR(temp_alert_max),
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POWER_SUPPLY_ATTR(temp_ambient),
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POWER_SUPPLY_ATTR(temp_ambient_alert_min),
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POWER_SUPPLY_ATTR(temp_ambient_alert_max),
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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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POWER_SUPPLY_ATTR(type),
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POWER_SUPPLY_ATTR(scope),
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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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POWER_SUPPLY_ATTR(serial_number),
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};
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static struct attribute *
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__power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
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static umode_t power_supply_attr_is_visible(struct kobject *kobj,
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struct attribute *attr,
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int attrno)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct power_supply *psy = dev_get_drvdata(dev);
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umode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
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int i;
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if (attrno == POWER_SUPPLY_PROP_TYPE)
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return mode;
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for (i = 0; i < psy->num_properties; i++) {
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int property = psy->properties[i];
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if (property == attrno) {
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if (psy->property_is_writeable &&
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psy->property_is_writeable(psy, property) > 0)
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mode |= S_IWUSR;
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return mode;
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}
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}
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return 0;
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}
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static struct attribute_group power_supply_attr_group = {
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.attrs = __power_supply_attrs,
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.is_visible = power_supply_attr_is_visible,
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};
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static const struct attribute_group *power_supply_attr_groups[] = {
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&power_supply_attr_group,
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NULL,
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};
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void power_supply_init_attrs(struct device_type *dev_type)
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{
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int i;
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dev_type->groups = power_supply_attr_groups;
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for (i = 0; i < ARRAY_SIZE(power_supply_attrs); i++)
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__power_supply_attrs[i] = &power_supply_attrs[i].attr;
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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, struct kobj_uevent_env *env)
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{
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struct power_supply *psy = dev_get_drvdata(dev);
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int 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 || !psy->dev) {
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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(env, "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 < 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 || ret == -ENODATA) {
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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(env, "POWER_SUPPLY_%s=%s", 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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