drivers/power/s3c_adc_battery.c

   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
  24 #include <plat/adc.h>
  25
  26 #define BAT_POLL_INTERVAL               10000 /* ms */
  27 #define JITTER_DELAY                    500 /* ms */
  28
  29 struct 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
  41 static struct delayed_work bat_work;
  42
  43 static 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
  49 static 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
  55 static 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
  90 static 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
 101 static 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
 110 static int calc_full_volt(int volt_val, int cur_val, int impedance)
 111 {
 112         return volt_val + cur_val * impedance / 1000;
 113 }
 114
 115 static int charge_finished(struct s3c_adc_bat *bat)
 116 {
 117         return bat->pdata->gpio_inverted ?
 118                 !gpio_get_value(bat->pdata->gpio_charge_finished) :
 119                 gpio_get_value(bat->pdata->gpio_charge_finished);
 120 }
 121
 122 static int s3c_adc_bat_get_property(struct power_supply *psy,
 123                                     enum power_supply_property psp,
 124                                     union power_supply_propval *val)
 125 {
 126         struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);
 127
 128         int new_level;
 129         int full_volt;
 130         const struct s3c_adc_bat_thresh *lut = bat->pdata->lut_noac;
 131         unsigned int lut_size = bat->pdata->lut_noac_cnt;
 132
 133         if (!bat) {
 134                 dev_err(psy->dev, "no battery infos ?!\n");
 135                 return -EINVAL;
 136         }
 137
 138         if (bat->volt_value < 0 || bat->cur_value < 0 ||
 139                 jiffies_to_msecs(jiffies - bat->timestamp) >
 140                         BAT_POLL_INTERVAL) {
 141                 bat->volt_value = s3c_adc_read(bat->client,
 142                         bat->pdata->volt_channel) * bat->pdata->volt_mult;
 143                 bat->cur_value = s3c_adc_read(bat->client,
 144                         bat->pdata->current_channel) * bat->pdata->current_mult;
 145                 bat->timestamp = jiffies;
 146         }
 147
 148         if (bat->cable_plugged &&
 149                 ((bat->pdata->gpio_charge_finished < 0) ||
 150                 !charge_finished(bat))) {
 151                 lut = bat->pdata->lut_acin;
 152                 lut_size = bat->pdata->lut_acin_cnt;
 153         }
 154
 155         new_level = 100000;
 156         full_volt = calc_full_volt((bat->volt_value / 1000),
 157                 (bat->cur_value / 1000), bat->pdata->internal_impedance);
 158
 159         if (full_volt < calc_full_volt(lut->volt, lut->cur,
 160                 bat->pdata->internal_impedance)) {
 161                 lut_size--;
 162                 while (lut_size--) {
 163                         int lut_volt1;
 164                         int lut_volt2;
 165
 166                         lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,
 167                                 bat->pdata->internal_impedance);
 168                         lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,
 169                                 bat->pdata->internal_impedance);
 170                         if (full_volt < lut_volt1 && full_volt >= lut_volt2) {
 171                                 new_level = (lut[1].level +
 172                                         (lut[0].level - lut[1].level) *
 173                                         (full_volt - lut_volt2) /
 174                                         (lut_volt1 - lut_volt2)) * 1000;
 175                                 break;
 176                         }
 177                         new_level = lut[1].level * 1000;
 178                         lut++;
 179                 }
 180         }
 181
 182         bat->level = new_level;
 183
 184         switch (psp) {
 185         case POWER_SUPPLY_PROP_STATUS:
 186                 if (bat->pdata->gpio_charge_finished < 0)
 187                         val->intval = bat->level == 100000 ?
 188                                 POWER_SUPPLY_STATUS_FULL : bat->status;
 189                 else
 190                         val->intval = bat->status;
 191                 return 0;
 192         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 193                 val->intval = 100000;
 194                 return 0;
 195         case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
 196                 val->intval = 0;
 197                 return 0;
 198         case POWER_SUPPLY_PROP_CHARGE_NOW:
 199                 val->intval = bat->level;
 200                 return 0;
 201         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 202                 val->intval = bat->volt_value;
 203                 return 0;
 204         case POWER_SUPPLY_PROP_CURRENT_NOW:
 205                 val->intval = bat->cur_value;
 206                 return 0;
 207         default:
 208                 return -EINVAL;
 209         }
 210 }
 211
 212 static struct s3c_adc_bat main_bat = {
 213         .psy = {
 214                 .name                   = "main-battery",
 215                 .type                   = POWER_SUPPLY_TYPE_BATTERY,
 216                 .properties             = s3c_adc_main_bat_props,
 217                 .num_properties         = ARRAY_SIZE(s3c_adc_main_bat_props),
 218                 .get_property           = s3c_adc_bat_get_property,
 219                 .external_power_changed = s3c_adc_bat_ext_power_changed,
 220                 .use_for_apm            = 1,
 221         },
 222 };
 223
 224 static void s3c_adc_bat_work(struct work_struct *work)
 225 {
 226         struct s3c_adc_bat *bat = &main_bat;
 227         int is_charged;
 228         int is_plugged;
 229         static int was_plugged;
 230
 231         is_plugged = power_supply_am_i_supplied(&bat->psy);
 232         bat->cable_plugged = is_plugged;
 233         if (is_plugged != was_plugged) {
 234                 was_plugged = is_plugged;
 235                 if (is_plugged) {
 236                         if (bat->pdata->enable_charger)
 237                                 bat->pdata->enable_charger();
 238                         bat->status = POWER_SUPPLY_STATUS_CHARGING;
 239                 } else {
 240                         if (bat->pdata->disable_charger)
 241                                 bat->pdata->disable_charger();
 242                         bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
 243                 }
 244         } else {
 245                 if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) {
 246                         is_charged = charge_finished(&main_bat);
 247                         if (is_charged) {
 248                                 if (bat->pdata->disable_charger)
 249                                         bat->pdata->disable_charger();
 250                                 bat->status = POWER_SUPPLY_STATUS_FULL;
 251                         } else {
 252                                 if (bat->pdata->enable_charger)
 253                                         bat->pdata->enable_charger();
 254                                 bat->status = POWER_SUPPLY_STATUS_CHARGING;
 255                         }
 256                 }
 257         }
 258
 259         power_supply_changed(&bat->psy);
 260 }
 261
 262 static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)
 263 {
 264         schedule_delayed_work(&bat_work,
 265                 msecs_to_jiffies(JITTER_DELAY));
 266         return IRQ_HANDLED;
 267 }
 268
 269 static int __init s3c_adc_bat_probe(struct platform_device *pdev)
 270 {
 271         struct s3c_adc_client   *client;
 272         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 273         int ret;
 274
 275         client = s3c_adc_register(pdev, NULL, NULL, 0);
 276         if (IS_ERR(client)) {
 277                 dev_err(&pdev->dev, "cannot register adc\n");
 278                 return PTR_ERR(client);
 279         }
 280
 281         platform_set_drvdata(pdev, client);
 282
 283         main_bat.client = client;
 284         main_bat.pdata = pdata;
 285         main_bat.volt_value = -1;
 286         main_bat.cur_value = -1;
 287         main_bat.cable_plugged = 0;
 288         main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;
 289
 290         ret = power_supply_register(&pdev->dev, &main_bat.psy);
 291         if (ret)
 292                 goto err_reg_main;
 293         if (pdata->backup_volt_mult) {
 294                 backup_bat.client = client;
 295                 backup_bat.pdata = pdev->dev.platform_data;
 296                 backup_bat.volt_value = -1;
 297                 ret = power_supply_register(&pdev->dev, &backup_bat.psy);
 298                 if (ret)
 299                         goto err_reg_backup;
 300         }
 301
 302         INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);
 303
 304         if (pdata->gpio_charge_finished >= 0) {
 305                 ret = gpio_request(pdata->gpio_charge_finished, "charged");
 306                 if (ret)
 307                         goto err_gpio;
 308
 309                 ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),
 310                                 s3c_adc_bat_charged,
 311                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 312                                 "battery charged", NULL);
 313                 if (ret)
 314                         goto err_irq;
 315         }
 316
 317         if (pdata->init) {
 318                 ret = pdata->init();
 319                 if (ret)
 320                         goto err_platform;
 321         }
 322
 323         dev_info(&pdev->dev, "successfully loaded\n");
 324         device_init_wakeup(&pdev->dev, 1);
 325
 326         /* Schedule timer to check current status */
 327         schedule_delayed_work(&bat_work,
 328                 msecs_to_jiffies(JITTER_DELAY));
 329
 330         return 0;
 331
 332 err_platform:
 333         if (pdata->gpio_charge_finished >= 0)
 334                 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 335 err_irq:
 336         if (pdata->gpio_charge_finished >= 0)
 337                 gpio_free(pdata->gpio_charge_finished);
 338 err_gpio:
 339         if (pdata->backup_volt_mult)
 340                 power_supply_unregister(&backup_bat.psy);
 341 err_reg_backup:
 342         power_supply_unregister(&main_bat.psy);
 343 err_reg_main:
 344         return ret;
 345 }
 346
 347 static int s3c_adc_bat_remove(struct platform_device *pdev)
 348 {
 349         struct s3c_adc_client *client = platform_get_drvdata(pdev);
 350         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 351
 352         power_supply_unregister(&main_bat.psy);
 353         if (pdata->backup_volt_mult)
 354                 power_supply_unregister(&backup_bat.psy);
 355
 356         s3c_adc_release(client);
 357
 358         if (pdata->gpio_charge_finished >= 0) {
 359                 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 360                 gpio_free(pdata->gpio_charge_finished);
 361         }
 362
 363         cancel_delayed_work(&bat_work);
 364
 365         if (pdata->exit)
 366                 pdata->exit();
 367
 368         return 0;
 369 }
 370
 371 #ifdef CONFIG_PM
 372 static int s3c_adc_bat_suspend(struct platform_device *pdev,
 373         pm_message_t state)
 374 {
 375         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 376
 377         if (pdata->gpio_charge_finished >= 0) {
 378                 if (device_may_wakeup(&pdev->dev))
 379                         enable_irq_wake(
 380                                 gpio_to_irq(pdata->gpio_charge_finished));
 381                 else {
 382                         disable_irq(gpio_to_irq(pdata->gpio_charge_finished));
 383                         main_bat.pdata->disable_charger();
 384                 }
 385         }
 386
 387         return 0;
 388 }
 389
 390 static int s3c_adc_bat_resume(struct platform_device *pdev)
 391 {
 392         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 393
 394         if (pdata->gpio_charge_finished >= 0) {
 395                 if (device_may_wakeup(&pdev->dev))
 396                         disable_irq_wake(
 397                                 gpio_to_irq(pdata->gpio_charge_finished));
 398                 else
 399                         enable_irq(gpio_to_irq(pdata->gpio_charge_finished));
 400         }
 401
 402         /* Schedule timer to check current status */
 403         schedule_delayed_work(&bat_work,
 404                 msecs_to_jiffies(JITTER_DELAY));
 405
 406         return 0;
 407 }
 408 #else
 409 #define s3c_adc_battery_suspend NULL
 410 #define s3c_adc_battery_resume NULL
 411 #endif
 412
 413 static struct platform_driver s3c_adc_bat_driver = {
 414         .driver         = {
 415                 .name   = "s3c-adc-battery",
 416         },
 417         .probe          = s3c_adc_bat_probe,
 418         .remove         = s3c_adc_bat_remove,
 419         .suspend        = s3c_adc_bat_suspend,
 420         .resume         = s3c_adc_bat_resume,
 421 };
 422
 423 static int __init s3c_adc_bat_init(void)
 424 {
 425         return platform_driver_register(&s3c_adc_bat_driver);
 426 }
 427 module_init(s3c_adc_bat_init);
 428
 429 static void __exit s3c_adc_bat_exit(void)
 430 {
 431         platform_driver_unregister(&s3c_adc_bat_driver);
 432 }
 433 module_exit(s3c_adc_bat_exit);
 434
 435 MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
 436 MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
 437 MODULE_LICENSE("GPL");