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 = bat->pdata->lut_noac;
 149        unsigned int lut_size = bat->pdata->lut_noac_cnt;
 150
 151        if (!bat) {
 152                dev_err(psy->dev, "no battery infos ?!\n");
 153                return -EINVAL;
 154        }
 155
 156        if (bat->volt_value < 0 || bat->cur_value < 0 ||
 157                jiffies_to_msecs(jiffies - bat->timestamp) >
 158                        BAT_POLL_INTERVAL) {
 159                bat->volt_value = gather_samples(bat->client,
 160                        bat->pdata->volt_samples,
 161                        bat->pdata->volt_channel) * bat->pdata->volt_mult;
 162                bat->cur_value = gather_samples(bat->client,
 163                        bat->pdata->current_samples,
 164                        bat->pdata->current_channel) * bat->pdata->current_mult;
 165                bat->timestamp = jiffies;
 166        }
 167
 168        if (bat->cable_plugged &&
 169                ((bat->pdata->gpio_charge_finished < 0) ||
 170                !charge_finished(bat))) {
 171                lut = bat->pdata->lut_acin;
 172                lut_size = bat->pdata->lut_acin_cnt;
 173        }
 174
 175        new_level = 100000;
 176        full_volt = calc_full_volt((bat->volt_value / 1000),
 177                (bat->cur_value / 1000), bat->pdata->internal_impedance);
 178
 179        if (full_volt < calc_full_volt(lut->volt, lut->cur,
 180                bat->pdata->internal_impedance)) {
 181                lut_size--;
 182                while (lut_size--) {
 183                        int lut_volt1;
 184                        int lut_volt2;
 185
 186                        lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,
 187                                bat->pdata->internal_impedance);
 188                        lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,
 189                                bat->pdata->internal_impedance);
 190                        if (full_volt < lut_volt1 && full_volt >= lut_volt2) {
 191                                new_level = (lut[1].level +
 192                                        (lut[0].level - lut[1].level) *
 193                                        (full_volt - lut_volt2) /
 194                                        (lut_volt1 - lut_volt2)) * 1000;
 195                                break;
 196                        }
 197                        new_level = lut[1].level * 1000;
 198                        lut++;
 199                }
 200        }
 201
 202        bat->level = new_level;
 203
 204        switch (psp) {
 205        case POWER_SUPPLY_PROP_STATUS:
 206                if (bat->pdata->gpio_charge_finished < 0)
 207                        val->intval = bat->level == 100000 ?
 208                                POWER_SUPPLY_STATUS_FULL : bat->status;
 209                else
 210                        val->intval = bat->status;
 211                return 0;
 212        case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 213                val->intval = 100000;
 214                return 0;
 215        case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
 216                val->intval = 0;
 217                return 0;
 218        case POWER_SUPPLY_PROP_CHARGE_NOW:
 219                val->intval = bat->level;
 220                return 0;
 221        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 222                val->intval = bat->volt_value;
 223                return 0;
 224        case POWER_SUPPLY_PROP_CURRENT_NOW:
 225                val->intval = bat->cur_value;
 226                return 0;
 227        default:
 228                return -EINVAL;
 229        }
 230}
 231
 232static struct s3c_adc_bat main_bat = {
 233        .psy = {
 234                .name                   = "main-battery",
 235                .type                   = POWER_SUPPLY_TYPE_BATTERY,
 236                .properties             = s3c_adc_main_bat_props,
 237                .num_properties         = ARRAY_SIZE(s3c_adc_main_bat_props),
 238                .get_property           = s3c_adc_bat_get_property,
 239                .external_power_changed = s3c_adc_bat_ext_power_changed,
 240                .use_for_apm            = 1,
 241        },
 242};
 243
 244static void s3c_adc_bat_work(struct work_struct *work)
 245{
 246        struct s3c_adc_bat *bat = &main_bat;
 247        int is_charged;
 248        int is_plugged;
 249        static int was_plugged;
 250
 251        is_plugged = power_supply_am_i_supplied(&bat->psy);
 252        bat->cable_plugged = is_plugged;
 253        if (is_plugged != was_plugged) {
 254                was_plugged = is_plugged;
 255                if (is_plugged) {
 256                        if (bat->pdata->enable_charger)
 257                                bat->pdata->enable_charger();
 258                        bat->status = POWER_SUPPLY_STATUS_CHARGING;
 259                } else {
 260                        if (bat->pdata->disable_charger)
 261                                bat->pdata->disable_charger();
 262                        bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
 263                }
 264        } else {
 265                if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) {
 266                        is_charged = charge_finished(&main_bat);
 267                        if (is_charged) {
 268                                if (bat->pdata->disable_charger)
 269                                        bat->pdata->disable_charger();
 270                                bat->status = POWER_SUPPLY_STATUS_FULL;
 271                        } else {
 272                                if (bat->pdata->enable_charger)
 273                                        bat->pdata->enable_charger();
 274                                bat->status = POWER_SUPPLY_STATUS_CHARGING;
 275                        }
 276                }
 277        }
 278
 279        power_supply_changed(&bat->psy);
 280}
 281
 282static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)
 283{
 284        schedule_delayed_work(&bat_work,
 285                msecs_to_jiffies(JITTER_DELAY));
 286        return IRQ_HANDLED;
 287}
 288
 289static int __devinit s3c_adc_bat_probe(struct platform_device *pdev)
 290{
 291        struct s3c_adc_client   *client;
 292        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 293        int ret;
 294
 295        client = s3c_adc_register(pdev, NULL, NULL, 0);
 296        if (IS_ERR(client)) {
 297                dev_err(&pdev->dev, "cannot register adc\n");
 298                return PTR_ERR(client);
 299        }
 300
 301        platform_set_drvdata(pdev, client);
 302
 303        main_bat.client = client;
 304        main_bat.pdata = pdata;
 305        main_bat.volt_value = -1;
 306        main_bat.cur_value = -1;
 307        main_bat.cable_plugged = 0;
 308        main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;
 309
 310        ret = power_supply_register(&pdev->dev, &main_bat.psy);
 311        if (ret)
 312                goto err_reg_main;
 313        if (pdata->backup_volt_mult) {
 314                backup_bat.client = client;
 315                backup_bat.pdata = pdev->dev.platform_data;
 316                backup_bat.volt_value = -1;
 317                ret = power_supply_register(&pdev->dev, &backup_bat.psy);
 318                if (ret)
 319                        goto err_reg_backup;
 320        }
 321
 322        INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);
 323
 324        if (pdata->gpio_charge_finished >= 0) {
 325                ret = gpio_request(pdata->gpio_charge_finished, "charged");
 326                if (ret)
 327                        goto err_gpio;
 328
 329                ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),
 330                                s3c_adc_bat_charged,
 331                                IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 332                                "battery charged", NULL);
 333                if (ret)
 334                        goto err_irq;
 335        }
 336
 337        if (pdata->init) {
 338                ret = pdata->init();
 339                if (ret)
 340                        goto err_platform;
 341        }
 342
 343        dev_info(&pdev->dev, "successfully loaded\n");
 344        device_init_wakeup(&pdev->dev, 1);
 345
 346        /* Schedule timer to check current status */
 347        schedule_delayed_work(&bat_work,
 348                msecs_to_jiffies(JITTER_DELAY));
 349
 350        return 0;
 351
 352err_platform:
 353        if (pdata->gpio_charge_finished >= 0)
 354                free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 355err_irq:
 356        if (pdata->gpio_charge_finished >= 0)
 357                gpio_free(pdata->gpio_charge_finished);
 358err_gpio:
 359        if (pdata->backup_volt_mult)
 360                power_supply_unregister(&backup_bat.psy);
 361err_reg_backup:
 362        power_supply_unregister(&main_bat.psy);
 363err_reg_main:
 364        return ret;
 365}
 366
 367static int s3c_adc_bat_remove(struct platform_device *pdev)
 368{
 369        struct s3c_adc_client *client = platform_get_drvdata(pdev);
 370        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 371
 372        power_supply_unregister(&main_bat.psy);
 373        if (pdata->backup_volt_mult)
 374                power_supply_unregister(&backup_bat.psy);
 375
 376        s3c_adc_release(client);
 377
 378        if (pdata->gpio_charge_finished >= 0) {
 379                free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 380                gpio_free(pdata->gpio_charge_finished);
 381        }
 382
 383        cancel_delayed_work(&bat_work);
 384
 385        if (pdata->exit)
 386                pdata->exit();
 387
 388        return 0;
 389}
 390
 391#ifdef CONFIG_PM
 392static int s3c_adc_bat_suspend(struct platform_device *pdev,
 393        pm_message_t state)
 394{
 395        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 396
 397        if (pdata->gpio_charge_finished >= 0) {
 398                if (device_may_wakeup(&pdev->dev))
 399                        enable_irq_wake(
 400                                gpio_to_irq(pdata->gpio_charge_finished));
 401                else {
 402                        disable_irq(gpio_to_irq(pdata->gpio_charge_finished));
 403                        main_bat.pdata->disable_charger();
 404                }
 405        }
 406
 407        return 0;
 408}
 409
 410static int s3c_adc_bat_resume(struct platform_device *pdev)
 411{
 412        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 413
 414        if (pdata->gpio_charge_finished >= 0) {
 415                if (device_may_wakeup(&pdev->dev))
 416                        disable_irq_wake(
 417                                gpio_to_irq(pdata->gpio_charge_finished));
 418                else
 419                        enable_irq(gpio_to_irq(pdata->gpio_charge_finished));
 420        }
 421
 422        /* Schedule timer to check current status */
 423        schedule_delayed_work(&bat_work,
 424                msecs_to_jiffies(JITTER_DELAY));
 425
 426        return 0;
 427}
 428#else
 429#define s3c_adc_bat_suspend NULL
 430#define s3c_adc_bat_resume NULL
 431#endif
 432
 433static struct platform_driver s3c_adc_bat_driver = {
 434        .driver         = {
 435                .name   = "s3c-adc-battery",
 436        },
 437        .probe          = s3c_adc_bat_probe,
 438        .remove         = s3c_adc_bat_remove,
 439        .suspend        = s3c_adc_bat_suspend,
 440        .resume         = s3c_adc_bat_resume,
 441};
 442
 443module_platform_driver(s3c_adc_bat_driver);
 444
 445MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
 446MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
 447MODULE_LICENSE("GPL");
 448
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