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 #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
  30 struct 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
  42 static struct delayed_work bat_work;
  43
  44 static 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
  50 static 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
  66 static 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
  72 static 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 = power_supply_get_drvdata(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
 108 static const struct power_supply_desc backup_bat_desc = {
 109         .name           = "backup-battery",
 110         .type           = POWER_SUPPLY_TYPE_BATTERY,
 111         .properties     = s3c_adc_backup_bat_props,
 112         .num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props),
 113         .get_property   = s3c_adc_backup_bat_get_property,
 114         .use_for_apm    = 1,
 115 };
 116
 117 static struct s3c_adc_bat backup_bat;
 118
 119 static 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
 128 static int calc_full_volt(int volt_val, int cur_val, int impedance)
 129 {
 130         return volt_val + cur_val * impedance / 1000;
 131 }
 132
 133 static 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
 140 static 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 = power_supply_get_drvdata(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
 235 static const struct power_supply_desc main_bat_desc = {
 236         .name                   = "main-battery",
 237         .type                   = POWER_SUPPLY_TYPE_BATTERY,
 238         .properties             = s3c_adc_main_bat_props,
 239         .num_properties         = ARRAY_SIZE(s3c_adc_main_bat_props),
 240         .get_property           = s3c_adc_bat_get_property,
 241         .external_power_changed = s3c_adc_bat_ext_power_changed,
 242         .use_for_apm            = 1,
 243 };
 244
 245 static struct s3c_adc_bat main_bat;
 246
 247 static 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
 285 static 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
 292 static 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         main_bat.psy = power_supply_register(&pdev->dev, &main_bat_desc, NULL);
 314         if (IS_ERR(main_bat.psy)) {
 315                 ret = PTR_ERR(main_bat.psy);
 316                 goto err_reg_main;
 317         }
 318         if (pdata->backup_volt_mult) {
 319                 const struct power_supply_config psy_cfg
 320                                                 = { .drv_data = &backup_bat, };
 321
 322                 backup_bat.client = client;
 323                 backup_bat.pdata = pdev->dev.platform_data;
 324                 backup_bat.volt_value = -1;
 325                 backup_bat.psy = power_supply_register(&pdev->dev,
 326                                                        &backup_bat_desc,
 327                                                        &psy_cfg);
 328                 if (IS_ERR(backup_bat.psy)) {
 329                         ret = PTR_ERR(backup_bat.psy);
 330                         goto err_reg_backup;
 331                 }
 332         }
 333
 334         INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);
 335
 336         if (pdata->gpio_charge_finished >= 0) {
 337                 ret = gpio_request(pdata->gpio_charge_finished, "charged");
 338                 if (ret)
 339                         goto err_gpio;
 340
 341                 ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),
 342                                 s3c_adc_bat_charged,
 343                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 344                                 "battery charged", NULL);
 345                 if (ret)
 346                         goto err_irq;
 347         }
 348
 349         if (pdata->init) {
 350                 ret = pdata->init();
 351                 if (ret)
 352                         goto err_platform;
 353         }
 354
 355         dev_info(&pdev->dev, "successfully loaded\n");
 356         device_init_wakeup(&pdev->dev, 1);
 357
 358         /* Schedule timer to check current status */
 359         schedule_delayed_work(&bat_work,
 360                 msecs_to_jiffies(JITTER_DELAY));
 361
 362         return 0;
 363
 364 err_platform:
 365         if (pdata->gpio_charge_finished >= 0)
 366                 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 367 err_irq:
 368         if (pdata->gpio_charge_finished >= 0)
 369                 gpio_free(pdata->gpio_charge_finished);
 370 err_gpio:
 371         if (pdata->backup_volt_mult)
 372                 power_supply_unregister(backup_bat.psy);
 373 err_reg_backup:
 374         power_supply_unregister(main_bat.psy);
 375 err_reg_main:
 376         return ret;
 377 }
 378
 379 static int s3c_adc_bat_remove(struct platform_device *pdev)
 380 {
 381         struct s3c_adc_client *client = platform_get_drvdata(pdev);
 382         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 383
 384         power_supply_unregister(main_bat.psy);
 385         if (pdata->backup_volt_mult)
 386                 power_supply_unregister(backup_bat.psy);
 387
 388         s3c_adc_release(client);
 389
 390         if (pdata->gpio_charge_finished >= 0) {
 391                 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 392                 gpio_free(pdata->gpio_charge_finished);
 393         }
 394
 395         cancel_delayed_work(&bat_work);
 396
 397         if (pdata->exit)
 398                 pdata->exit();
 399
 400         return 0;
 401 }
 402
 403 #ifdef CONFIG_PM
 404 static int s3c_adc_bat_suspend(struct platform_device *pdev,
 405         pm_message_t state)
 406 {
 407         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 408
 409         if (pdata->gpio_charge_finished >= 0) {
 410                 if (device_may_wakeup(&pdev->dev))
 411                         enable_irq_wake(
 412                                 gpio_to_irq(pdata->gpio_charge_finished));
 413                 else {
 414                         disable_irq(gpio_to_irq(pdata->gpio_charge_finished));
 415                         main_bat.pdata->disable_charger();
 416                 }
 417         }
 418
 419         return 0;
 420 }
 421
 422 static int s3c_adc_bat_resume(struct platform_device *pdev)
 423 {
 424         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 425
 426         if (pdata->gpio_charge_finished >= 0) {
 427                 if (device_may_wakeup(&pdev->dev))
 428                         disable_irq_wake(
 429                                 gpio_to_irq(pdata->gpio_charge_finished));
 430                 else
 431                         enable_irq(gpio_to_irq(pdata->gpio_charge_finished));
 432         }
 433
 434         /* Schedule timer to check current status */
 435         schedule_delayed_work(&bat_work,
 436                 msecs_to_jiffies(JITTER_DELAY));
 437
 438         return 0;
 439 }
 440 #else
 441 #define s3c_adc_bat_suspend NULL
 442 #define s3c_adc_bat_resume NULL
 443 #endif
 444
 445 static struct platform_driver s3c_adc_bat_driver = {
 446         .driver         = {
 447                 .name   = "s3c-adc-battery",
 448         },
 449         .probe          = s3c_adc_bat_probe,
 450         .remove         = s3c_adc_bat_remove,
 451         .suspend        = s3c_adc_bat_suspend,
 452         .resume         = s3c_adc_bat_resume,
 453 };
 454
 455 module_platform_driver(s3c_adc_bat_driver);
 456
 457 MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
 458 MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
 459 MODULE_LICENSE("GPL");