579 lines
13 KiB
C
579 lines
13 KiB
C
/*
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* Universal power supply monitor class
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*
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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/module.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/power_supply.h>
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#include <linux/thermal.h>
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#include "power_supply.h"
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/* exported for the APM Power driver, APM emulation */
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struct class *power_supply_class;
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EXPORT_SYMBOL_GPL(power_supply_class);
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static struct device_type power_supply_dev_type;
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static bool __power_supply_is_supplied_by(struct power_supply *supplier,
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struct power_supply *supply)
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{
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int i;
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if (!supply->supplied_from && !supplier->supplied_to)
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return false;
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/* Support both supplied_to and supplied_from modes */
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if (supply->supplied_from) {
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if (!supplier->name)
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return false;
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for (i = 0; i < supply->num_supplies; i++)
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if (!strcmp(supplier->name, supply->supplied_from[i]))
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return true;
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} else {
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if (!supply->name)
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return false;
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for (i = 0; i < supplier->num_supplicants; i++)
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if (!strcmp(supplier->supplied_to[i], supply->name))
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return true;
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}
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return false;
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}
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static int __power_supply_changed_work(struct device *dev, void *data)
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{
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struct power_supply *psy = (struct power_supply *)data;
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struct power_supply *pst = dev_get_drvdata(dev);
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if (__power_supply_is_supplied_by(psy, pst)) {
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if (pst->external_power_changed)
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pst->external_power_changed(pst);
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}
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return 0;
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}
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static void power_supply_changed_work(struct work_struct *work)
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{
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struct power_supply *psy = container_of(work, struct power_supply,
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changed_work);
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dev_dbg(psy->dev, "%s\n", __func__);
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class_for_each_device(power_supply_class, NULL, psy,
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__power_supply_changed_work);
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power_supply_update_leds(psy);
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kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
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}
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void power_supply_changed(struct power_supply *psy)
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{
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dev_dbg(psy->dev, "%s\n", __func__);
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schedule_work(&psy->changed_work);
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}
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EXPORT_SYMBOL_GPL(power_supply_changed);
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#ifdef CONFIG_OF
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#include <linux/of.h>
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static int __power_supply_populate_supplied_from(struct device *dev,
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void *data)
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{
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struct power_supply *psy = (struct power_supply *)data;
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struct power_supply *epsy = dev_get_drvdata(dev);
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struct device_node *np;
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int i = 0;
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do {
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np = of_parse_phandle(psy->of_node, "power-supplies", i++);
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if (!np)
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continue;
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if (np == epsy->of_node) {
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dev_info(psy->dev, "%s: Found supply : %s\n",
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psy->name, epsy->name);
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psy->supplied_from[i-1] = (char *)epsy->name;
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psy->num_supplies++;
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of_node_put(np);
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break;
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}
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of_node_put(np);
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} while (np);
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return 0;
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}
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static int power_supply_populate_supplied_from(struct power_supply *psy)
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{
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int error;
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error = class_for_each_device(power_supply_class, NULL, psy,
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__power_supply_populate_supplied_from);
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dev_dbg(psy->dev, "%s %d\n", __func__, error);
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return error;
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}
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static int __power_supply_find_supply_from_node(struct device *dev,
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void *data)
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{
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struct device_node *np = (struct device_node *)data;
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struct power_supply *epsy = dev_get_drvdata(dev);
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/* return error breaks out of class_for_each_device loop */
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if (epsy->of_node == np)
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return -EINVAL;
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return 0;
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}
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static int power_supply_find_supply_from_node(struct device_node *supply_node)
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{
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int error;
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struct device *dev;
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struct class_dev_iter iter;
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/*
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* Use iterator to see if any other device is registered.
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* This is required since class_for_each_device returns 0
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* if there are no devices registered.
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*/
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class_dev_iter_init(&iter, power_supply_class, NULL, NULL);
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dev = class_dev_iter_next(&iter);
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if (!dev)
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return -EPROBE_DEFER;
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/*
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* We have to treat the return value as inverted, because if
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* we return error on not found, then it won't continue looking.
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* So we trick it by returning error on success to stop looking
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* once the matching device is found.
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*/
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error = class_for_each_device(power_supply_class, NULL, supply_node,
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__power_supply_find_supply_from_node);
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return error ? 0 : -EPROBE_DEFER;
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}
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static int power_supply_check_supplies(struct power_supply *psy)
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{
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struct device_node *np;
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int cnt = 0;
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/* If there is already a list honor it */
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if (psy->supplied_from && psy->num_supplies > 0)
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return 0;
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/* No device node found, nothing to do */
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if (!psy->of_node)
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return 0;
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do {
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int ret;
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np = of_parse_phandle(psy->of_node, "power-supplies", cnt++);
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if (!np)
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continue;
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ret = power_supply_find_supply_from_node(np);
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if (ret) {
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dev_dbg(psy->dev, "Failed to find supply, defer!\n");
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of_node_put(np);
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return -EPROBE_DEFER;
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}
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of_node_put(np);
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} while (np);
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/* All supplies found, allocate char ** array for filling */
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psy->supplied_from = devm_kzalloc(psy->dev, sizeof(psy->supplied_from),
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GFP_KERNEL);
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if (!psy->supplied_from) {
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dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
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return -ENOMEM;
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}
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*psy->supplied_from = devm_kzalloc(psy->dev, sizeof(char *) * cnt,
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GFP_KERNEL);
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if (!*psy->supplied_from) {
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dev_err(psy->dev, "Couldn't allocate memory for supply list\n");
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return -ENOMEM;
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}
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return power_supply_populate_supplied_from(psy);
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}
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#else
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static inline int power_supply_check_supplies(struct power_supply *psy)
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{
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return 0;
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}
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#endif
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static int __power_supply_am_i_supplied(struct device *dev, void *data)
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{
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union power_supply_propval ret = {0,};
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struct power_supply *psy = (struct power_supply *)data;
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struct power_supply *epsy = dev_get_drvdata(dev);
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if (__power_supply_is_supplied_by(epsy, psy))
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if (!epsy->get_property(epsy, POWER_SUPPLY_PROP_ONLINE, &ret)) {
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if (ret.intval)
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return ret.intval;
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}
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return 0;
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}
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int power_supply_am_i_supplied(struct power_supply *psy)
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{
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int error;
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error = class_for_each_device(power_supply_class, NULL, psy,
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__power_supply_am_i_supplied);
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dev_dbg(psy->dev, "%s %d\n", __func__, error);
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return error;
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}
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EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
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static int __power_supply_is_system_supplied(struct device *dev, void *data)
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{
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union power_supply_propval ret = {0,};
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struct power_supply *psy = dev_get_drvdata(dev);
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unsigned int *count = data;
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(*count)++;
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if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
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if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
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return 0;
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if (ret.intval)
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return ret.intval;
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}
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return 0;
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}
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int power_supply_is_system_supplied(void)
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{
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int error;
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unsigned int count = 0;
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error = class_for_each_device(power_supply_class, NULL, &count,
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__power_supply_is_system_supplied);
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/*
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* If no power class device was found at all, most probably we are
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* running on a desktop system, so assume we are on mains power.
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*/
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if (count == 0)
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return 1;
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return error;
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}
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EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
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int power_supply_set_battery_charged(struct power_supply *psy)
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{
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if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
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psy->set_charged(psy);
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return 0;
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}
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
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static int power_supply_match_device_by_name(struct device *dev, const void *data)
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{
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const char *name = data;
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struct power_supply *psy = dev_get_drvdata(dev);
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return strcmp(psy->name, name) == 0;
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}
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struct power_supply *power_supply_get_by_name(const char *name)
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{
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struct device *dev = class_find_device(power_supply_class, NULL, name,
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power_supply_match_device_by_name);
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return dev ? dev_get_drvdata(dev) : NULL;
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}
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EXPORT_SYMBOL_GPL(power_supply_get_by_name);
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int power_supply_powers(struct power_supply *psy, struct device *dev)
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{
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return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
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}
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EXPORT_SYMBOL_GPL(power_supply_powers);
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static void power_supply_dev_release(struct device *dev)
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{
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pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
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kfree(dev);
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}
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#ifdef CONFIG_THERMAL
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static int power_supply_read_temp(struct thermal_zone_device *tzd,
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unsigned long *temp)
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{
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struct power_supply *psy;
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union power_supply_propval val;
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int ret;
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WARN_ON(tzd == NULL);
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psy = tzd->devdata;
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ret = psy->get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
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/* Convert tenths of degree Celsius to milli degree Celsius. */
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if (!ret)
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*temp = val.intval * 100;
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return ret;
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}
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static struct thermal_zone_device_ops psy_tzd_ops = {
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.get_temp = power_supply_read_temp,
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};
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static int psy_register_thermal(struct power_supply *psy)
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{
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int i;
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/* Register battery zone device psy reports temperature */
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for (i = 0; i < psy->num_properties; i++) {
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if (psy->properties[i] == POWER_SUPPLY_PROP_TEMP) {
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psy->tzd = thermal_zone_device_register(psy->name, 0, 0,
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psy, &psy_tzd_ops, NULL, 0, 0);
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if (IS_ERR(psy->tzd))
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return PTR_ERR(psy->tzd);
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break;
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}
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}
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return 0;
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}
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static void psy_unregister_thermal(struct power_supply *psy)
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{
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if (IS_ERR_OR_NULL(psy->tzd))
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return;
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thermal_zone_device_unregister(psy->tzd);
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}
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/* thermal cooling device callbacks */
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static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
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unsigned long *state)
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{
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struct power_supply *psy;
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union power_supply_propval val;
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int ret;
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psy = tcd->devdata;
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ret = psy->get_property(psy,
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POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
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if (!ret)
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*state = val.intval;
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return ret;
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}
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static int ps_get_cur_chrage_cntl_limit(struct thermal_cooling_device *tcd,
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unsigned long *state)
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{
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struct power_supply *psy;
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union power_supply_propval val;
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int ret;
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psy = tcd->devdata;
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ret = psy->get_property(psy,
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POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
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if (!ret)
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*state = val.intval;
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return ret;
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}
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static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
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unsigned long state)
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{
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struct power_supply *psy;
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union power_supply_propval val;
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int ret;
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psy = tcd->devdata;
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val.intval = state;
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ret = psy->set_property(psy,
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POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
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return ret;
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}
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static struct thermal_cooling_device_ops psy_tcd_ops = {
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.get_max_state = ps_get_max_charge_cntl_limit,
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.get_cur_state = ps_get_cur_chrage_cntl_limit,
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.set_cur_state = ps_set_cur_charge_cntl_limit,
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};
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static int psy_register_cooler(struct power_supply *psy)
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{
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int i;
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/* Register for cooling device if psy can control charging */
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for (i = 0; i < psy->num_properties; i++) {
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if (psy->properties[i] ==
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POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
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psy->tcd = thermal_cooling_device_register(
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(char *)psy->name,
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psy, &psy_tcd_ops);
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if (IS_ERR(psy->tcd))
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return PTR_ERR(psy->tcd);
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break;
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}
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}
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return 0;
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}
|
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|
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static void psy_unregister_cooler(struct power_supply *psy)
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{
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if (IS_ERR_OR_NULL(psy->tcd))
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return;
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thermal_cooling_device_unregister(psy->tcd);
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}
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#else
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static int psy_register_thermal(struct power_supply *psy)
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{
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return 0;
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}
|
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|
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static void psy_unregister_thermal(struct power_supply *psy)
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{
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}
|
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|
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static int psy_register_cooler(struct power_supply *psy)
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{
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return 0;
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}
|
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|
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static void psy_unregister_cooler(struct power_supply *psy)
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{
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}
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#endif
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|
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int power_supply_register(struct device *parent, struct power_supply *psy)
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{
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struct device *dev;
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int rc;
|
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|
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
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if (!dev)
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return -ENOMEM;
|
|
|
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device_initialize(dev);
|
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|
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dev->class = power_supply_class;
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dev->type = &power_supply_dev_type;
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dev->parent = parent;
|
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dev->release = power_supply_dev_release;
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dev_set_drvdata(dev, psy);
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psy->dev = dev;
|
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|
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INIT_WORK(&psy->changed_work, power_supply_changed_work);
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|
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rc = power_supply_check_supplies(psy);
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if (rc) {
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dev_info(dev, "Not all required supplies found, defer probe\n");
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goto check_supplies_failed;
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}
|
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rc = kobject_set_name(&dev->kobj, "%s", psy->name);
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if (rc)
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goto kobject_set_name_failed;
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|
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rc = device_add(dev);
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if (rc)
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goto device_add_failed;
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|
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rc = psy_register_thermal(psy);
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if (rc)
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goto register_thermal_failed;
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|
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rc = psy_register_cooler(psy);
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if (rc)
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goto register_cooler_failed;
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|
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rc = power_supply_create_triggers(psy);
|
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if (rc)
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goto create_triggers_failed;
|
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|
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power_supply_changed(psy);
|
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|
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goto success;
|
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|
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create_triggers_failed:
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psy_unregister_cooler(psy);
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register_cooler_failed:
|
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psy_unregister_thermal(psy);
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register_thermal_failed:
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device_del(dev);
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kobject_set_name_failed:
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device_add_failed:
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check_supplies_failed:
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put_device(dev);
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success:
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return rc;
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}
|
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EXPORT_SYMBOL_GPL(power_supply_register);
|
|
|
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void power_supply_unregister(struct power_supply *psy)
|
|
{
|
|
cancel_work_sync(&psy->changed_work);
|
|
sysfs_remove_link(&psy->dev->kobj, "powers");
|
|
power_supply_remove_triggers(psy);
|
|
psy_unregister_cooler(psy);
|
|
psy_unregister_thermal(psy);
|
|
device_unregister(psy->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(power_supply_unregister);
|
|
|
|
static int __init power_supply_class_init(void)
|
|
{
|
|
power_supply_class = class_create(THIS_MODULE, "power_supply");
|
|
|
|
if (IS_ERR(power_supply_class))
|
|
return PTR_ERR(power_supply_class);
|
|
|
|
power_supply_class->dev_uevent = power_supply_uevent;
|
|
power_supply_init_attrs(&power_supply_dev_type);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit power_supply_class_exit(void)
|
|
{
|
|
class_destroy(power_supply_class);
|
|
}
|
|
|
|
subsys_initcall(power_supply_class_init);
|
|
module_exit(power_supply_class_exit);
|
|
|
|
MODULE_DESCRIPTION("Universal power supply monitor class");
|
|
MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
|
|
"Szabolcs Gyurko, "
|
|
"Anton Vorontsov <cbou@mail.ru>");
|
|
MODULE_LICENSE("GPL");
|