linux/drivers/power/power_supply_core.c
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   1/*
   2 *  Universal power supply monitor class
   3 *
   4 *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
   5 *  Copyright © 2004  Szabolcs Gyurko
   6 *  Copyright © 2003  Ian Molton <spyro@f2s.com>
   7 *
   8 *  Modified: 2004, Oct     Szabolcs Gyurko
   9 *
  10 *  You may use this code as per GPL version 2
  11 */
  12
  13#include <linux/module.h>
  14#include <linux/types.h>
  15#include <linux/init.h>
  16#include <linux/slab.h>
  17#include <linux/device.h>
  18#include <linux/err.h>
  19#include <linux/power_supply.h>
  20#include <linux/thermal.h>
  21#include "power_supply.h"
  22
  23/* exported for the APM Power driver, APM emulation */
  24struct class *power_supply_class;
  25EXPORT_SYMBOL_GPL(power_supply_class);
  26
  27static struct device_type power_supply_dev_type;
  28
  29static int __power_supply_changed_work(struct device *dev, void *data)
  30{
  31        struct power_supply *psy = (struct power_supply *)data;
  32        struct power_supply *pst = dev_get_drvdata(dev);
  33        int i;
  34
  35        for (i = 0; i < psy->num_supplicants; i++)
  36                if (!strcmp(psy->supplied_to[i], pst->name)) {
  37                        if (pst->external_power_changed)
  38                                pst->external_power_changed(pst);
  39                }
  40        return 0;
  41}
  42
  43static void power_supply_changed_work(struct work_struct *work)
  44{
  45        struct power_supply *psy = container_of(work, struct power_supply,
  46                                                changed_work);
  47
  48        dev_dbg(psy->dev, "%s\n", __func__);
  49
  50        class_for_each_device(power_supply_class, NULL, psy,
  51                              __power_supply_changed_work);
  52
  53        power_supply_update_leds(psy);
  54
  55        kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
  56}
  57
  58void power_supply_changed(struct power_supply *psy)
  59{
  60        dev_dbg(psy->dev, "%s\n", __func__);
  61
  62        schedule_work(&psy->changed_work);
  63}
  64EXPORT_SYMBOL_GPL(power_supply_changed);
  65
  66static int __power_supply_am_i_supplied(struct device *dev, void *data)
  67{
  68        union power_supply_propval ret = {0,};
  69        struct power_supply *psy = (struct power_supply *)data;
  70        struct power_supply *epsy = dev_get_drvdata(dev);
  71        int i;
  72
  73        for (i = 0; i < epsy->num_supplicants; i++) {
  74                if (!strcmp(epsy->supplied_to[i], psy->name)) {
  75                        if (epsy->get_property(epsy,
  76                                  POWER_SUPPLY_PROP_ONLINE, &ret))
  77                                continue;
  78                        if (ret.intval)
  79                                return ret.intval;
  80                }
  81        }
  82        return 0;
  83}
  84
  85int power_supply_am_i_supplied(struct power_supply *psy)
  86{
  87        int error;
  88
  89        error = class_for_each_device(power_supply_class, NULL, psy,
  90                                      __power_supply_am_i_supplied);
  91
  92        dev_dbg(psy->dev, "%s %d\n", __func__, error);
  93
  94        return error;
  95}
  96EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
  97
  98static int __power_supply_is_system_supplied(struct device *dev, void *data)
  99{
 100        union power_supply_propval ret = {0,};
 101        struct power_supply *psy = dev_get_drvdata(dev);
 102        unsigned int *count = data;
 103
 104        (*count)++;
 105        if (psy->type != POWER_SUPPLY_TYPE_BATTERY) {
 106                if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &ret))
 107                        return 0;
 108                if (ret.intval)
 109                        return ret.intval;
 110        }
 111        return 0;
 112}
 113
 114int power_supply_is_system_supplied(void)
 115{
 116        int error;
 117        unsigned int count = 0;
 118
 119        error = class_for_each_device(power_supply_class, NULL, &count,
 120                                      __power_supply_is_system_supplied);
 121
 122        /*
 123         * If no power class device was found at all, most probably we are
 124         * running on a desktop system, so assume we are on mains power.
 125         */
 126        if (count == 0)
 127                return 1;
 128
 129        return error;
 130}
 131EXPORT_SYMBOL_GPL(power_supply_is_system_supplied);
 132
 133int power_supply_set_battery_charged(struct power_supply *psy)
 134{
 135        if (psy->type == POWER_SUPPLY_TYPE_BATTERY && psy->set_charged) {
 136                psy->set_charged(psy);
 137                return 0;
 138        }
 139
 140        return -EINVAL;
 141}
 142EXPORT_SYMBOL_GPL(power_supply_set_battery_charged);
 143
 144static int power_supply_match_device_by_name(struct device *dev, void *data)
 145{
 146        const char *name = data;
 147        struct power_supply *psy = dev_get_drvdata(dev);
 148
 149        return strcmp(psy->name, name) == 0;
 150}
 151
 152struct power_supply *power_supply_get_by_name(char *name)
 153{
 154        struct device *dev = class_find_device(power_supply_class, NULL, name,
 155                                        power_supply_match_device_by_name);
 156
 157        return dev ? dev_get_drvdata(dev) : NULL;
 158}
 159EXPORT_SYMBOL_GPL(power_supply_get_by_name);
 160
 161int power_supply_powers(struct power_supply *psy, struct device *dev)
 162{
 163        return sysfs_create_link(&psy->dev->kobj, &dev->kobj, "powers");
 164}
 165EXPORT_SYMBOL_GPL(power_supply_powers);
 166
 167static void power_supply_dev_release(struct device *dev)
 168{
 169        pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
 170        kfree(dev);
 171}
 172
 173#ifdef CONFIG_THERMAL
 174static int power_supply_read_temp(struct thermal_zone_device *tzd,
 175                unsigned long *temp)
 176{
 177        struct power_supply *psy;
 178        union power_supply_propval val;
 179        int ret;
 180
 181        WARN_ON(tzd == NULL);
 182        psy = tzd->devdata;
 183        ret = psy->get_property(psy, POWER_SUPPLY_PROP_TEMP, &val);
 184
 185        /* Convert tenths of degree Celsius to milli degree Celsius. */
 186        if (!ret)
 187                *temp = val.intval * 100;
 188
 189        return ret;
 190}
 191
 192static struct thermal_zone_device_ops psy_tzd_ops = {
 193        .get_temp = power_supply_read_temp,
 194};
 195
 196static int psy_register_thermal(struct power_supply *psy)
 197{
 198        int i;
 199
 200        /* Register battery zone device psy reports temperature */
 201        for (i = 0; i < psy->num_properties; i++) {
 202                if (psy->properties[i] == POWER_SUPPLY_PROP_TEMP) {
 203                        psy->tzd = thermal_zone_device_register(psy->name, 0, 0,
 204                                        psy, &psy_tzd_ops, NULL, 0, 0);
 205                        if (IS_ERR(psy->tzd))
 206                                return PTR_ERR(psy->tzd);
 207                        break;
 208                }
 209        }
 210        return 0;
 211}
 212
 213static void psy_unregister_thermal(struct power_supply *psy)
 214{
 215        if (IS_ERR_OR_NULL(psy->tzd))
 216                return;
 217        thermal_zone_device_unregister(psy->tzd);
 218}
 219
 220/* thermal cooling device callbacks */
 221static int ps_get_max_charge_cntl_limit(struct thermal_cooling_device *tcd,
 222                                        unsigned long *state)
 223{
 224        struct power_supply *psy;
 225        union power_supply_propval val;
 226        int ret;
 227
 228        psy = tcd->devdata;
 229        ret = psy->get_property(psy,
 230                POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT_MAX, &val);
 231        if (!ret)
 232                *state = val.intval;
 233
 234        return ret;
 235}
 236
 237static int ps_get_cur_chrage_cntl_limit(struct thermal_cooling_device *tcd,
 238                                        unsigned long *state)
 239{
 240        struct power_supply *psy;
 241        union power_supply_propval val;
 242        int ret;
 243
 244        psy = tcd->devdata;
 245        ret = psy->get_property(psy,
 246                POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
 247        if (!ret)
 248                *state = val.intval;
 249
 250        return ret;
 251}
 252
 253static int ps_set_cur_charge_cntl_limit(struct thermal_cooling_device *tcd,
 254                                        unsigned long state)
 255{
 256        struct power_supply *psy;
 257        union power_supply_propval val;
 258        int ret;
 259
 260        psy = tcd->devdata;
 261        val.intval = state;
 262        ret = psy->set_property(psy,
 263                POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT, &val);
 264
 265        return ret;
 266}
 267
 268static struct thermal_cooling_device_ops psy_tcd_ops = {
 269        .get_max_state = ps_get_max_charge_cntl_limit,
 270        .get_cur_state = ps_get_cur_chrage_cntl_limit,
 271        .set_cur_state = ps_set_cur_charge_cntl_limit,
 272};
 273
 274static int psy_register_cooler(struct power_supply *psy)
 275{
 276        int i;
 277
 278        /* Register for cooling device if psy can control charging */
 279        for (i = 0; i < psy->num_properties; i++) {
 280                if (psy->properties[i] ==
 281                                POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT) {
 282                        psy->tcd = thermal_cooling_device_register(
 283                                                        (char *)psy->name,
 284                                                        psy, &psy_tcd_ops);
 285                        if (IS_ERR(psy->tcd))
 286                                return PTR_ERR(psy->tcd);
 287                        break;
 288                }
 289        }
 290        return 0;
 291}
 292
 293static void psy_unregister_cooler(struct power_supply *psy)
 294{
 295        if (IS_ERR_OR_NULL(psy->tcd))
 296                return;
 297        thermal_cooling_device_unregister(psy->tcd);
 298}
 299#else
 300static int psy_register_thermal(struct power_supply *psy)
 301{
 302        return 0;
 303}
 304
 305static void psy_unregister_thermal(struct power_supply *psy)
 306{
 307}
 308
 309static int psy_register_cooler(struct power_supply *psy)
 310{
 311        return 0;
 312}
 313
 314static void psy_unregister_cooler(struct power_supply *psy)
 315{
 316}
 317#endif
 318
 319int power_supply_register(struct device *parent, struct power_supply *psy)
 320{
 321        struct device *dev;
 322        int rc;
 323
 324        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 325        if (!dev)
 326                return -ENOMEM;
 327
 328        device_initialize(dev);
 329
 330        dev->class = power_supply_class;
 331        dev->type = &power_supply_dev_type;
 332        dev->parent = parent;
 333        dev->release = power_supply_dev_release;
 334        dev_set_drvdata(dev, psy);
 335        psy->dev = dev;
 336
 337        INIT_WORK(&psy->changed_work, power_supply_changed_work);
 338
 339        rc = kobject_set_name(&dev->kobj, "%s", psy->name);
 340        if (rc)
 341                goto kobject_set_name_failed;
 342
 343        rc = device_add(dev);
 344        if (rc)
 345                goto device_add_failed;
 346
 347        rc = psy_register_thermal(psy);
 348        if (rc)
 349                goto register_thermal_failed;
 350
 351        rc = psy_register_cooler(psy);
 352        if (rc)
 353                goto register_cooler_failed;
 354
 355        rc = power_supply_create_triggers(psy);
 356        if (rc)
 357                goto create_triggers_failed;
 358
 359        power_supply_changed(psy);
 360
 361        goto success;
 362
 363create_triggers_failed:
 364        psy_unregister_cooler(psy);
 365register_cooler_failed:
 366        psy_unregister_thermal(psy);
 367register_thermal_failed:
 368        device_del(dev);
 369kobject_set_name_failed:
 370device_add_failed:
 371        put_device(dev);
 372success:
 373        return rc;
 374}
 375EXPORT_SYMBOL_GPL(power_supply_register);
 376
 377void power_supply_unregister(struct power_supply *psy)
 378{
 379        cancel_work_sync(&psy->changed_work);
 380        sysfs_remove_link(&psy->dev->kobj, "powers");
 381        power_supply_remove_triggers(psy);
 382        psy_unregister_cooler(psy);
 383        psy_unregister_thermal(psy);
 384        device_unregister(psy->dev);
 385}
 386EXPORT_SYMBOL_GPL(power_supply_unregister);
 387
 388static int __init power_supply_class_init(void)
 389{
 390        power_supply_class = class_create(THIS_MODULE, "power_supply");
 391
 392        if (IS_ERR(power_supply_class))
 393                return PTR_ERR(power_supply_class);
 394
 395        power_supply_class->dev_uevent = power_supply_uevent;
 396        power_supply_init_attrs(&power_supply_dev_type);
 397
 398        return 0;
 399}
 400
 401static void __exit power_supply_class_exit(void)
 402{
 403        class_destroy(power_supply_class);
 404}
 405
 406subsys_initcall(power_supply_class_init);
 407module_exit(power_supply_class_exit);
 408
 409MODULE_DESCRIPTION("Universal power supply monitor class");
 410MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
 411              "Szabolcs Gyurko, "
 412              "Anton Vorontsov <cbou@mail.ru>");
 413MODULE_LICENSE("GPL");
 414
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