linux/drivers/power/s3c_adc_battery.c
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   1/*
   2 *      iPAQ h1930/h1940/rx1950 battery controller driver
   3 *      Copyright (c) Vasily Khoruzhick
   4 *      Based on h1940_battery.c by Arnaud Patard
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License.  See the file COPYING in the main directory of this archive for
   8 * more details.
   9 *
  10 */
  11
  12#include <linux/interrupt.h>
  13#include <linux/platform_device.h>
  14#include <linux/power_supply.h>
  15#include <linux/leds.h>
  16#include <linux/gpio.h>
  17#include <linux/err.h>
  18#include <linux/timer.h>
  19#include <linux/jiffies.h>
  20#include <linux/s3c_adc_battery.h>
  21#include <linux/errno.h>
  22#include <linux/init.h>
  23#include <linux/module.h>
  24
  25#include <plat/adc.h>
  26
  27#define BAT_POLL_INTERVAL               10000 /* ms */
  28#define JITTER_DELAY                    500 /* ms */
  29
  30struct s3c_adc_bat {
  31        struct power_supply             psy;
  32        struct s3c_adc_client           *client;
  33        struct s3c_adc_bat_pdata        *pdata;
  34        int                             volt_value;
  35        int                             cur_value;
  36        unsigned int                    timestamp;
  37        int                             level;
  38        int                             status;
  39        int                             cable_plugged:1;
  40};
  41
  42static struct delayed_work bat_work;
  43
  44static void s3c_adc_bat_ext_power_changed(struct power_supply *psy)
  45{
  46        schedule_delayed_work(&bat_work,
  47                msecs_to_jiffies(JITTER_DELAY));
  48}
  49
  50static int gather_samples(struct s3c_adc_client *client, int num, int channel)
  51{
  52        int value, i;
  53
  54        /* default to 1 if nothing is set */
  55        if (num < 1)
  56                num = 1;
  57
  58        value = 0;
  59        for (i = 0; i < num; i++)
  60                value += s3c_adc_read(client, channel);
  61        value /= num;
  62
  63        return value;
  64}
  65
  66static enum power_supply_property s3c_adc_backup_bat_props[] = {
  67        POWER_SUPPLY_PROP_VOLTAGE_NOW,
  68        POWER_SUPPLY_PROP_VOLTAGE_MIN,
  69        POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
  70};
  71
  72static int s3c_adc_backup_bat_get_property(struct power_supply *psy,
  73                                enum power_supply_property psp,
  74                                union power_supply_propval *val)
  75{
  76        struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);
  77
  78        if (!bat) {
  79                dev_err(psy->dev, "%s: no battery infos ?!\n", __func__);
  80                return -EINVAL;
  81        }
  82
  83        if (bat->volt_value < 0 ||
  84                jiffies_to_msecs(jiffies - bat->timestamp) >
  85                        BAT_POLL_INTERVAL) {
  86                bat->volt_value = gather_samples(bat->client,
  87                        bat->pdata->backup_volt_samples,
  88                        bat->pdata->backup_volt_channel);
  89                bat->volt_value *= bat->pdata->backup_volt_mult;
  90                bat->timestamp = jiffies;
  91        }
  92
  93        switch (psp) {
  94        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  95                val->intval = bat->volt_value;
  96                return 0;
  97        case POWER_SUPPLY_PROP_VOLTAGE_MIN:
  98                val->intval = bat->pdata->backup_volt_min;
  99                return 0;
 100        case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 101                val->intval = bat->pdata->backup_volt_max;
 102                return 0;
 103        default:
 104                return -EINVAL;
 105        }
 106}
 107
 108static struct s3c_adc_bat backup_bat = {
 109        .psy = {
 110                .name           = "backup-battery",
 111                .type           = POWER_SUPPLY_TYPE_BATTERY,
 112                .properties     = s3c_adc_backup_bat_props,
 113                .num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props),
 114                .get_property   = s3c_adc_backup_bat_get_property,
 115                .use_for_apm    = 1,
 116        },
 117};
 118
 119static enum power_supply_property s3c_adc_main_bat_props[] = {
 120        POWER_SUPPLY_PROP_STATUS,
 121        POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 122        POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
 123        POWER_SUPPLY_PROP_CHARGE_NOW,
 124        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 125        POWER_SUPPLY_PROP_CURRENT_NOW,
 126};
 127
 128static int calc_full_volt(int volt_val, int cur_val, int impedance)
 129{
 130        return volt_val + cur_val * impedance / 1000;
 131}
 132
 133static int charge_finished(struct s3c_adc_bat *bat)
 134{
 135        return bat->pdata->gpio_inverted ?
 136                !gpio_get_value(bat->pdata->gpio_charge_finished) :
 137                gpio_get_value(bat->pdata->gpio_charge_finished);
 138}
 139
 140static int s3c_adc_bat_get_property(struct power_supply *psy,
 141                                    enum power_supply_property psp,
 142                                    union power_supply_propval *val)
 143{
 144        struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);
 145
 146        int new_level;
 147        int full_volt;
 148        const struct s3c_adc_bat_thresh *lut;
 149        unsigned int lut_size;
 150
 151        if (!bat) {
 152                dev_err(psy->dev, "no battery infos ?!\n");
 153                return -EINVAL;
 154        }
 155
 156        lut = bat->pdata->lut_noac;
 157        lut_size = bat->pdata->lut_noac_cnt;
 158
 159        if (bat->volt_value < 0 || bat->cur_value < 0 ||
 160                jiffies_to_msecs(jiffies - bat->timestamp) >
 161                        BAT_POLL_INTERVAL) {
 162                bat->volt_value = gather_samples(bat->client,
 163                        bat->pdata->volt_samples,
 164                        bat->pdata->volt_channel) * bat->pdata->volt_mult;
 165                bat->cur_value = gather_samples(bat->client,
 166                        bat->pdata->current_samples,
 167                        bat->pdata->current_channel) * bat->pdata->current_mult;
 168                bat->timestamp = jiffies;
 169        }
 170
 171        if (bat->cable_plugged &&
 172                ((bat->pdata->gpio_charge_finished < 0) ||
 173                !charge_finished(bat))) {
 174                lut = bat->pdata->lut_acin;
 175                lut_size = bat->pdata->lut_acin_cnt;
 176        }
 177
 178        new_level = 100000;
 179        full_volt = calc_full_volt((bat->volt_value / 1000),
 180                (bat->cur_value / 1000), bat->pdata->internal_impedance);
 181
 182        if (full_volt < calc_full_volt(lut->volt, lut->cur,
 183                bat->pdata->internal_impedance)) {
 184                lut_size--;
 185                while (lut_size--) {
 186                        int lut_volt1;
 187                        int lut_volt2;
 188
 189                        lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,
 190                                bat->pdata->internal_impedance);
 191                        lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,
 192                                bat->pdata->internal_impedance);
 193                        if (full_volt < lut_volt1 && full_volt >= lut_volt2) {
 194                                new_level = (lut[1].level +
 195                                        (lut[0].level - lut[1].level) *
 196                                        (full_volt - lut_volt2) /
 197                                        (lut_volt1 - lut_volt2)) * 1000;
 198                                break;
 199                        }
 200                        new_level = lut[1].level * 1000;
 201                        lut++;
 202                }
 203        }
 204
 205        bat->level = new_level;
 206
 207        switch (psp) {
 208        case POWER_SUPPLY_PROP_STATUS:
 209                if (bat->pdata->gpio_charge_finished < 0)
 210                        val->intval = bat->level == 100000 ?
 211                                POWER_SUPPLY_STATUS_FULL : bat->status;
 212                else
 213                        val->intval = bat->status;
 214                return 0;
 215        case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 216                val->intval = 100000;
 217                return 0;
 218        case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
 219                val->intval = 0;
 220                return 0;
 221        case POWER_SUPPLY_PROP_CHARGE_NOW:
 222                val->intval = bat->level;
 223                return 0;
 224        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 225                val->intval = bat->volt_value;
 226                return 0;
 227        case POWER_SUPPLY_PROP_CURRENT_NOW:
 228                val->intval = bat->cur_value;
 229                return 0;
 230        default:
 231                return -EINVAL;
 232        }
 233}
 234
 235static struct s3c_adc_bat main_bat = {
 236        .psy = {
 237                .name                   = "main-battery",
 238                .type                   = POWER_SUPPLY_TYPE_BATTERY,
 239                .properties             = s3c_adc_main_bat_props,
 240                .num_properties         = ARRAY_SIZE(s3c_adc_main_bat_props),
 241                .get_property           = s3c_adc_bat_get_property,
 242                .external_power_changed = s3c_adc_bat_ext_power_changed,
 243                .use_for_apm            = 1,
 244        },
 245};
 246
 247static void s3c_adc_bat_work(struct work_struct *work)
 248{
 249        struct s3c_adc_bat *bat = &main_bat;
 250        int is_charged;
 251        int is_plugged;
 252        static int was_plugged;
 253
 254        is_plugged = power_supply_am_i_supplied(&bat->psy);
 255        bat->cable_plugged = is_plugged;
 256        if (is_plugged != was_plugged) {
 257                was_plugged = is_plugged;
 258                if (is_plugged) {
 259                        if (bat->pdata->enable_charger)
 260                                bat->pdata->enable_charger();
 261                        bat->status = POWER_SUPPLY_STATUS_CHARGING;
 262                } else {
 263                        if (bat->pdata->disable_charger)
 264                                bat->pdata->disable_charger();
 265                        bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
 266                }
 267        } else {
 268                if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) {
 269                        is_charged = charge_finished(&main_bat);
 270                        if (is_charged) {
 271                                if (bat->pdata->disable_charger)
 272                                        bat->pdata->disable_charger();
 273                                bat->status = POWER_SUPPLY_STATUS_FULL;
 274                        } else {
 275                                if (bat->pdata->enable_charger)
 276                                        bat->pdata->enable_charger();
 277                                bat->status = POWER_SUPPLY_STATUS_CHARGING;
 278                        }
 279                }
 280        }
 281
 282        power_supply_changed(&bat->psy);
 283}
 284
 285static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)
 286{
 287        schedule_delayed_work(&bat_work,
 288                msecs_to_jiffies(JITTER_DELAY));
 289        return IRQ_HANDLED;
 290}
 291
 292static int s3c_adc_bat_probe(struct platform_device *pdev)
 293{
 294        struct s3c_adc_client   *client;
 295        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 296        int ret;
 297
 298        client = s3c_adc_register(pdev, NULL, NULL, 0);
 299        if (IS_ERR(client)) {
 300                dev_err(&pdev->dev, "cannot register adc\n");
 301                return PTR_ERR(client);
 302        }
 303
 304        platform_set_drvdata(pdev, client);
 305
 306        main_bat.client = client;
 307        main_bat.pdata = pdata;
 308        main_bat.volt_value = -1;
 309        main_bat.cur_value = -1;
 310        main_bat.cable_plugged = 0;
 311        main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;
 312
 313        ret = power_supply_register(&pdev->dev, &main_bat.psy);
 314        if (ret)
 315                goto err_reg_main;
 316        if (pdata->backup_volt_mult) {
 317                backup_bat.client = client;
 318                backup_bat.pdata = pdev->dev.platform_data;
 319                backup_bat.volt_value = -1;
 320                ret = power_supply_register(&pdev->dev, &backup_bat.psy);
 321                if (ret)
 322                        goto err_reg_backup;
 323        }
 324
 325        INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);
 326
 327        if (pdata->gpio_charge_finished >= 0) {
 328                ret = gpio_request(pdata->gpio_charge_finished, "charged");
 329                if (ret)
 330                        goto err_gpio;
 331
 332                ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),
 333                                s3c_adc_bat_charged,
 334                                IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 335                                "battery charged", NULL);
 336                if (ret)
 337                        goto err_irq;
 338        }
 339
 340        if (pdata->init) {
 341                ret = pdata->init();
 342                if (ret)
 343                        goto err_platform;
 344        }
 345
 346        dev_info(&pdev->dev, "successfully loaded\n");
 347        device_init_wakeup(&pdev->dev, 1);
 348
 349        /* Schedule timer to check current status */
 350        schedule_delayed_work(&bat_work,
 351                msecs_to_jiffies(JITTER_DELAY));
 352
 353        return 0;
 354
 355err_platform:
 356        if (pdata->gpio_charge_finished >= 0)
 357                free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 358err_irq:
 359        if (pdata->gpio_charge_finished >= 0)
 360                gpio_free(pdata->gpio_charge_finished);
 361err_gpio:
 362        if (pdata->backup_volt_mult)
 363                power_supply_unregister(&backup_bat.psy);
 364err_reg_backup:
 365        power_supply_unregister(&main_bat.psy);
 366err_reg_main:
 367        return ret;
 368}
 369
 370static int s3c_adc_bat_remove(struct platform_device *pdev)
 371{
 372        struct s3c_adc_client *client = platform_get_drvdata(pdev);
 373        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 374
 375        power_supply_unregister(&main_bat.psy);
 376        if (pdata->backup_volt_mult)
 377                power_supply_unregister(&backup_bat.psy);
 378
 379        s3c_adc_release(client);
 380
 381        if (pdata->gpio_charge_finished >= 0) {
 382                free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 383                gpio_free(pdata->gpio_charge_finished);
 384        }
 385
 386        cancel_delayed_work(&bat_work);
 387
 388        if (pdata->exit)
 389                pdata->exit();
 390
 391        return 0;
 392}
 393
 394#ifdef CONFIG_PM
 395static int s3c_adc_bat_suspend(struct platform_device *pdev,
 396        pm_message_t state)
 397{
 398        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 399
 400        if (pdata->gpio_charge_finished >= 0) {
 401                if (device_may_wakeup(&pdev->dev))
 402                        enable_irq_wake(
 403                                gpio_to_irq(pdata->gpio_charge_finished));
 404                else {
 405                        disable_irq(gpio_to_irq(pdata->gpio_charge_finished));
 406                        main_bat.pdata->disable_charger();
 407                }
 408        }
 409
 410        return 0;
 411}
 412
 413static int s3c_adc_bat_resume(struct platform_device *pdev)
 414{
 415        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 416
 417        if (pdata->gpio_charge_finished >= 0) {
 418                if (device_may_wakeup(&pdev->dev))
 419                        disable_irq_wake(
 420                                gpio_to_irq(pdata->gpio_charge_finished));
 421                else
 422                        enable_irq(gpio_to_irq(pdata->gpio_charge_finished));
 423        }
 424
 425        /* Schedule timer to check current status */
 426        schedule_delayed_work(&bat_work,
 427                msecs_to_jiffies(JITTER_DELAY));
 428
 429        return 0;
 430}
 431#else
 432#define s3c_adc_bat_suspend NULL
 433#define s3c_adc_bat_resume NULL
 434#endif
 435
 436static struct platform_driver s3c_adc_bat_driver = {
 437        .driver         = {
 438                .name   = "s3c-adc-battery",
 439        },
 440        .probe          = s3c_adc_bat_probe,
 441        .remove         = s3c_adc_bat_remove,
 442        .suspend        = s3c_adc_bat_suspend,
 443        .resume         = s3c_adc_bat_resume,
 444};
 445
 446module_platform_driver(s3c_adc_bat_driver);
 447
 448MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
 449MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
 450MODULE_LICENSE("GPL");
 451
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