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 = 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
 108 static 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
 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 = 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
 232 static 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
 244 static 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
 282 static 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
 289 static int 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
 352 err_platform:
 353         if (pdata->gpio_charge_finished >= 0)
 354                 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 355 err_irq:
 356         if (pdata->gpio_charge_finished >= 0)
 357                 gpio_free(pdata->gpio_charge_finished);
 358 err_gpio:
 359         if (pdata->backup_volt_mult)
 360                 power_supply_unregister(&backup_bat.psy);
 361 err_reg_backup:
 362         power_supply_unregister(&main_bat.psy);
 363 err_reg_main:
 364         return ret;
 365 }
 366
 367 static 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
 392 static 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
 410 static 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
 433 static 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
 443 module_platform_driver(s3c_adc_bat_driver);
 444
 445 MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
 446 MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
 447 MODULE_LICENSE("GPL");