linux/drivers/power/s3c_adc_battery.c
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   1/*
   2 *      iPAQ h1930/h1940/rx1950 battery controler 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
  24#include <plat/adc.h>
  25
  26#define BAT_POLL_INTERVAL               10000 /* ms */
  27#define JITTER_DELAY                    500 /* ms */
  28
  29struct s3c_adc_bat {
  30        struct power_supply             psy;
  31        struct s3c_adc_client           *client;
  32        struct s3c_adc_bat_pdata        *pdata;
  33        int                             volt_value;
  34        int                             cur_value;
  35        unsigned int                    timestamp;
  36        int                             level;
  37        int                             status;
  38        int                             cable_plugged:1;
  39};
  40
  41static struct delayed_work bat_work;
  42
  43static void s3c_adc_bat_ext_power_changed(struct power_supply *psy)
  44{
  45        schedule_delayed_work(&bat_work,
  46                msecs_to_jiffies(JITTER_DELAY));
  47}
  48
  49static enum power_supply_property s3c_adc_backup_bat_props[] = {
  50        POWER_SUPPLY_PROP_VOLTAGE_NOW,
  51        POWER_SUPPLY_PROP_VOLTAGE_MIN,
  52        POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
  53};
  54
  55static int s3c_adc_backup_bat_get_property(struct power_supply *psy,
  56                                enum power_supply_property psp,
  57                                union power_supply_propval *val)
  58{
  59        struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);
  60
  61        if (!bat) {
  62                dev_err(psy->dev, "%s: no battery infos ?!\n", __func__);
  63                return -EINVAL;
  64        }
  65
  66        if (bat->volt_value < 0 ||
  67                jiffies_to_msecs(jiffies - bat->timestamp) >
  68                        BAT_POLL_INTERVAL) {
  69                bat->volt_value = s3c_adc_read(bat->client,
  70                        bat->pdata->backup_volt_channel);
  71                bat->volt_value *= bat->pdata->backup_volt_mult;
  72                bat->timestamp = jiffies;
  73        }
  74
  75        switch (psp) {
  76        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  77                val->intval = bat->volt_value;
  78                return 0;
  79        case POWER_SUPPLY_PROP_VOLTAGE_MIN:
  80                val->intval = bat->pdata->backup_volt_min;
  81                return 0;
  82        case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
  83                val->intval = bat->pdata->backup_volt_max;
  84                return 0;
  85        default:
  86                return -EINVAL;
  87        }
  88}
  89
  90static struct s3c_adc_bat backup_bat = {
  91        .psy = {
  92                .name           = "backup-battery",
  93                .type           = POWER_SUPPLY_TYPE_BATTERY,
  94                .properties     = s3c_adc_backup_bat_props,
  95                .num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props),
  96                .get_property   = s3c_adc_backup_bat_get_property,
  97                .use_for_apm    = 1,
  98        },
  99};
 100
 101static enum power_supply_property s3c_adc_main_bat_props[] = {
 102        POWER_SUPPLY_PROP_STATUS,
 103        POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 104        POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
 105        POWER_SUPPLY_PROP_CHARGE_NOW,
 106        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 107        POWER_SUPPLY_PROP_CURRENT_NOW,
 108};
 109
 110static int calc_full_volt(int volt_val, int cur_val, int impedance)
 111{
 112        return volt_val + cur_val * impedance / 1000;
 113}
 114
 115static int s3c_adc_bat_get_property(struct power_supply *psy,
 116                                    enum power_supply_property psp,
 117                                    union power_supply_propval *val)
 118{
 119        struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);
 120
 121        int new_level;
 122        int full_volt;
 123        const struct s3c_adc_bat_thresh *lut = bat->pdata->lut_noac;
 124        unsigned int lut_size = bat->pdata->lut_noac_cnt;
 125
 126        if (!bat) {
 127                dev_err(psy->dev, "no battery infos ?!\n");
 128                return -EINVAL;
 129        }
 130
 131        if (bat->volt_value < 0 || bat->cur_value < 0 ||
 132                jiffies_to_msecs(jiffies - bat->timestamp) >
 133                        BAT_POLL_INTERVAL) {
 134                bat->volt_value = s3c_adc_read(bat->client,
 135                        bat->pdata->volt_channel) * bat->pdata->volt_mult;
 136                bat->cur_value = s3c_adc_read(bat->client,
 137                        bat->pdata->current_channel) * bat->pdata->current_mult;
 138                bat->timestamp = jiffies;
 139        }
 140
 141        if (bat->cable_plugged &&
 142                ((bat->pdata->gpio_charge_finished < 0) ||
 143                !gpio_get_value(bat->pdata->gpio_charge_finished))) {
 144                lut = bat->pdata->lut_acin;
 145                lut_size = bat->pdata->lut_acin_cnt;
 146        }
 147
 148        new_level = 100000;
 149        full_volt = calc_full_volt((bat->volt_value / 1000),
 150                (bat->cur_value / 1000), bat->pdata->internal_impedance);
 151
 152        if (full_volt < calc_full_volt(lut->volt, lut->cur,
 153                bat->pdata->internal_impedance)) {
 154                lut_size--;
 155                while (lut_size--) {
 156                        int lut_volt1;
 157                        int lut_volt2;
 158
 159                        lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,
 160                                bat->pdata->internal_impedance);
 161                        lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,
 162                                bat->pdata->internal_impedance);
 163                        if (full_volt < lut_volt1 && full_volt >= lut_volt2) {
 164                                new_level = (lut[1].level +
 165                                        (lut[0].level - lut[1].level) *
 166                                        (full_volt - lut_volt2) /
 167                                        (lut_volt1 - lut_volt2)) * 1000;
 168                                break;
 169                        }
 170                        new_level = lut[1].level * 1000;
 171                        lut++;
 172                }
 173        }
 174
 175        bat->level = new_level;
 176
 177        switch (psp) {
 178        case POWER_SUPPLY_PROP_STATUS:
 179                if (bat->pdata->gpio_charge_finished < 0)
 180                        val->intval = bat->level == 100000 ?
 181                                POWER_SUPPLY_STATUS_FULL : bat->status;
 182                else
 183                        val->intval = bat->status;
 184                return 0;
 185        case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 186                val->intval = 100000;
 187                return 0;
 188        case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
 189                val->intval = 0;
 190                return 0;
 191        case POWER_SUPPLY_PROP_CHARGE_NOW:
 192                val->intval = bat->level;
 193                return 0;
 194        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 195                val->intval = bat->volt_value;
 196                return 0;
 197        case POWER_SUPPLY_PROP_CURRENT_NOW:
 198                val->intval = bat->cur_value;
 199                return 0;
 200        default:
 201                return -EINVAL;
 202        }
 203}
 204
 205static struct s3c_adc_bat main_bat = {
 206        .psy = {
 207                .name                   = "main-battery",
 208                .type                   = POWER_SUPPLY_TYPE_BATTERY,
 209                .properties             = s3c_adc_main_bat_props,
 210                .num_properties         = ARRAY_SIZE(s3c_adc_main_bat_props),
 211                .get_property           = s3c_adc_bat_get_property,
 212                .external_power_changed = s3c_adc_bat_ext_power_changed,
 213                .use_for_apm            = 1,
 214        },
 215};
 216
 217static void s3c_adc_bat_work(struct work_struct *work)
 218{
 219        struct s3c_adc_bat *bat = &main_bat;
 220        int is_charged;
 221        int is_plugged;
 222        static int was_plugged;
 223
 224        is_plugged = power_supply_am_i_supplied(&bat->psy);
 225        bat->cable_plugged = is_plugged;
 226        if (is_plugged != was_plugged) {
 227                was_plugged = is_plugged;
 228                if (is_plugged) {
 229                        if (bat->pdata->enable_charger)
 230                                bat->pdata->enable_charger();
 231                        bat->status = POWER_SUPPLY_STATUS_CHARGING;
 232                } else {
 233                        if (bat->pdata->disable_charger)
 234                                bat->pdata->disable_charger();
 235                        bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
 236                }
 237        } else {
 238                if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) {
 239                        is_charged = gpio_get_value(
 240                                main_bat.pdata->gpio_charge_finished);
 241                        if (is_charged) {
 242                                if (bat->pdata->disable_charger)
 243                                        bat->pdata->disable_charger();
 244                                bat->status = POWER_SUPPLY_STATUS_FULL;
 245                        } else {
 246                                if (bat->pdata->enable_charger)
 247                                        bat->pdata->enable_charger();
 248                                bat->status = POWER_SUPPLY_STATUS_CHARGING;
 249                        }
 250                }
 251        }
 252
 253        power_supply_changed(&bat->psy);
 254}
 255
 256static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)
 257{
 258        schedule_delayed_work(&bat_work,
 259                msecs_to_jiffies(JITTER_DELAY));
 260        return IRQ_HANDLED;
 261}
 262
 263static int __init s3c_adc_bat_probe(struct platform_device *pdev)
 264{
 265        struct s3c_adc_client   *client;
 266        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 267        int ret;
 268
 269        client = s3c_adc_register(pdev, NULL, NULL, 0);
 270        if (IS_ERR(client)) {
 271                dev_err(&pdev->dev, "cannot register adc\n");
 272                return PTR_ERR(client);
 273        }
 274
 275        platform_set_drvdata(pdev, client);
 276
 277        main_bat.client = client;
 278        main_bat.pdata = pdata;
 279        main_bat.volt_value = -1;
 280        main_bat.cur_value = -1;
 281        main_bat.cable_plugged = 0;
 282        main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;
 283
 284        ret = power_supply_register(&pdev->dev, &main_bat.psy);
 285        if (ret)
 286                goto err_reg_main;
 287        if (pdata->backup_volt_mult) {
 288                backup_bat.client = client;
 289                backup_bat.pdata = pdev->dev.platform_data;
 290                backup_bat.volt_value = -1;
 291                ret = power_supply_register(&pdev->dev, &backup_bat.psy);
 292                if (ret)
 293                        goto err_reg_backup;
 294        }
 295
 296        INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);
 297
 298        if (pdata->gpio_charge_finished >= 0) {
 299                ret = gpio_request(pdata->gpio_charge_finished, "charged");
 300                if (ret)
 301                        goto err_gpio;
 302
 303                ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),
 304                                s3c_adc_bat_charged,
 305                                IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 306                                "battery charged", NULL);
 307                if (ret)
 308                        goto err_irq;
 309        }
 310
 311        if (pdata->init) {
 312                ret = pdata->init();
 313                if (ret)
 314                        goto err_platform;
 315        }
 316
 317        dev_info(&pdev->dev, "successfully loaded\n");
 318        device_init_wakeup(&pdev->dev, 1);
 319
 320        /* Schedule timer to check current status */
 321        schedule_delayed_work(&bat_work,
 322                msecs_to_jiffies(JITTER_DELAY));
 323
 324        return 0;
 325
 326err_platform:
 327        if (pdata->gpio_charge_finished >= 0)
 328                free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 329err_irq:
 330        if (pdata->gpio_charge_finished >= 0)
 331                gpio_free(pdata->gpio_charge_finished);
 332err_gpio:
 333        if (pdata->backup_volt_mult)
 334                power_supply_unregister(&backup_bat.psy);
 335err_reg_backup:
 336        power_supply_unregister(&main_bat.psy);
 337err_reg_main:
 338        return ret;
 339}
 340
 341static int s3c_adc_bat_remove(struct platform_device *pdev)
 342{
 343        struct s3c_adc_client *client = platform_get_drvdata(pdev);
 344        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 345
 346        power_supply_unregister(&main_bat.psy);
 347        if (pdata->backup_volt_mult)
 348                power_supply_unregister(&backup_bat.psy);
 349
 350        s3c_adc_release(client);
 351
 352        if (pdata->gpio_charge_finished >= 0) {
 353                free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 354                gpio_free(pdata->gpio_charge_finished);
 355        }
 356
 357        cancel_delayed_work(&bat_work);
 358
 359        if (pdata->exit)
 360                pdata->exit();
 361
 362        return 0;
 363}
 364
 365#ifdef CONFIG_PM
 366static int s3c_adc_bat_suspend(struct platform_device *pdev,
 367        pm_message_t state)
 368{
 369        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 370
 371        if (pdata->gpio_charge_finished >= 0) {
 372                if (device_may_wakeup(&pdev->dev))
 373                        enable_irq_wake(
 374                                gpio_to_irq(pdata->gpio_charge_finished));
 375                else {
 376                        disable_irq(gpio_to_irq(pdata->gpio_charge_finished));
 377                        main_bat.pdata->disable_charger();
 378                }
 379        }
 380
 381        return 0;
 382}
 383
 384static int s3c_adc_bat_resume(struct platform_device *pdev)
 385{
 386        struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 387
 388        if (pdata->gpio_charge_finished >= 0) {
 389                if (device_may_wakeup(&pdev->dev))
 390                        disable_irq_wake(
 391                                gpio_to_irq(pdata->gpio_charge_finished));
 392                else
 393                        enable_irq(gpio_to_irq(pdata->gpio_charge_finished));
 394        }
 395
 396        /* Schedule timer to check current status */
 397        schedule_delayed_work(&bat_work,
 398                msecs_to_jiffies(JITTER_DELAY));
 399
 400        return 0;
 401}
 402#else
 403#define s3c_adc_battery_suspend NULL
 404#define s3c_adc_battery_resume NULL
 405#endif
 406
 407static struct platform_driver s3c_adc_bat_driver = {
 408        .driver         = {
 409                .name   = "s3c-adc-battery",
 410        },
 411        .probe          = s3c_adc_bat_probe,
 412        .remove         = s3c_adc_bat_remove,
 413        .suspend        = s3c_adc_bat_suspend,
 414        .resume         = s3c_adc_bat_resume,
 415};
 416
 417static int __init s3c_adc_bat_init(void)
 418{
 419        return platform_driver_register(&s3c_adc_bat_driver);
 420}
 421module_init(s3c_adc_bat_init);
 422
 423static void __exit s3c_adc_bat_exit(void)
 424{
 425        platform_driver_unregister(&s3c_adc_bat_driver);
 426}
 427module_exit(s3c_adc_bat_exit);
 428
 429MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
 430MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controler driver");
 431MODULE_LICENSE("GPL");
 432