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 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
 205 static 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
 217 static 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
 256 static 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
 263 static 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
 326 err_platform:
 327         if (pdata->gpio_charge_finished >= 0)
 328                 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 329 err_irq:
 330         if (pdata->gpio_charge_finished >= 0)
 331                 gpio_free(pdata->gpio_charge_finished);
 332 err_gpio:
 333         if (pdata->backup_volt_mult)
 334                 power_supply_unregister(&backup_bat.psy);
 335 err_reg_backup:
 336         power_supply_unregister(&main_bat.psy);
 337 err_reg_main:
 338         return ret;
 339 }
 340
 341 static 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
 366 static 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
 384 static 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
 407 static 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
 417 static int __init s3c_adc_bat_init(void)
 418 {
 419         return platform_driver_register(&s3c_adc_bat_driver);
 420 }
 421 module_init(s3c_adc_bat_init);
 422
 423 static void __exit s3c_adc_bat_exit(void)
 424 {
 425         platform_driver_unregister(&s3c_adc_bat_driver);
 426 }
 427 module_exit(s3c_adc_bat_exit);
 428
 429 MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
 430 MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
 431 MODULE_LICENSE("GPL");