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 enum power_supply_property s3c_adc_backup_bat_props[] = {
  51         POWER_SUPPLY_PROP_VOLTAGE_NOW,
  52         POWER_SUPPLY_PROP_VOLTAGE_MIN,
  53         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
  54 };
  55
  56 static int s3c_adc_backup_bat_get_property(struct power_supply *psy,
  57                                 enum power_supply_property psp,
  58                                 union power_supply_propval *val)
  59 {
  60         struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);
  61
  62         if (!bat) {
  63                 dev_err(psy->dev, "%s: no battery infos ?!\n", __func__);
  64                 return -EINVAL;
  65         }
  66
  67         if (bat->volt_value < 0 ||
  68                 jiffies_to_msecs(jiffies - bat->timestamp) >
  69                         BAT_POLL_INTERVAL) {
  70                 bat->volt_value = s3c_adc_read(bat->client,
  71                         bat->pdata->backup_volt_channel);
  72                 bat->volt_value *= bat->pdata->backup_volt_mult;
  73                 bat->timestamp = jiffies;
  74         }
  75
  76         switch (psp) {
  77         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
  78                 val->intval = bat->volt_value;
  79                 return 0;
  80         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
  81                 val->intval = bat->pdata->backup_volt_min;
  82                 return 0;
  83         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
  84                 val->intval = bat->pdata->backup_volt_max;
  85                 return 0;
  86         default:
  87                 return -EINVAL;
  88         }
  89 }
  90
  91 static struct s3c_adc_bat backup_bat = {
  92         .psy = {
  93                 .name           = "backup-battery",
  94                 .type           = POWER_SUPPLY_TYPE_BATTERY,
  95                 .properties     = s3c_adc_backup_bat_props,
  96                 .num_properties = ARRAY_SIZE(s3c_adc_backup_bat_props),
  97                 .get_property   = s3c_adc_backup_bat_get_property,
  98                 .use_for_apm    = 1,
  99         },
 100 };
 101
 102 static enum power_supply_property s3c_adc_main_bat_props[] = {
 103         POWER_SUPPLY_PROP_STATUS,
 104         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 105         POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
 106         POWER_SUPPLY_PROP_CHARGE_NOW,
 107         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 108         POWER_SUPPLY_PROP_CURRENT_NOW,
 109 };
 110
 111 static int calc_full_volt(int volt_val, int cur_val, int impedance)
 112 {
 113         return volt_val + cur_val * impedance / 1000;
 114 }
 115
 116 static int charge_finished(struct s3c_adc_bat *bat)
 117 {
 118         return bat->pdata->gpio_inverted ?
 119                 !gpio_get_value(bat->pdata->gpio_charge_finished) :
 120                 gpio_get_value(bat->pdata->gpio_charge_finished);
 121 }
 122
 123 static int s3c_adc_bat_get_property(struct power_supply *psy,
 124                                     enum power_supply_property psp,
 125                                     union power_supply_propval *val)
 126 {
 127         struct s3c_adc_bat *bat = container_of(psy, struct s3c_adc_bat, psy);
 128
 129         int new_level;
 130         int full_volt;
 131         const struct s3c_adc_bat_thresh *lut = bat->pdata->lut_noac;
 132         unsigned int lut_size = bat->pdata->lut_noac_cnt;
 133
 134         if (!bat) {
 135                 dev_err(psy->dev, "no battery infos ?!\n");
 136                 return -EINVAL;
 137         }
 138
 139         if (bat->volt_value < 0 || bat->cur_value < 0 ||
 140                 jiffies_to_msecs(jiffies - bat->timestamp) >
 141                         BAT_POLL_INTERVAL) {
 142                 bat->volt_value = s3c_adc_read(bat->client,
 143                         bat->pdata->volt_channel) * bat->pdata->volt_mult;
 144                 bat->cur_value = s3c_adc_read(bat->client,
 145                         bat->pdata->current_channel) * bat->pdata->current_mult;
 146                 bat->timestamp = jiffies;
 147         }
 148
 149         if (bat->cable_plugged &&
 150                 ((bat->pdata->gpio_charge_finished < 0) ||
 151                 !charge_finished(bat))) {
 152                 lut = bat->pdata->lut_acin;
 153                 lut_size = bat->pdata->lut_acin_cnt;
 154         }
 155
 156         new_level = 100000;
 157         full_volt = calc_full_volt((bat->volt_value / 1000),
 158                 (bat->cur_value / 1000), bat->pdata->internal_impedance);
 159
 160         if (full_volt < calc_full_volt(lut->volt, lut->cur,
 161                 bat->pdata->internal_impedance)) {
 162                 lut_size--;
 163                 while (lut_size--) {
 164                         int lut_volt1;
 165                         int lut_volt2;
 166
 167                         lut_volt1 = calc_full_volt(lut[0].volt, lut[0].cur,
 168                                 bat->pdata->internal_impedance);
 169                         lut_volt2 = calc_full_volt(lut[1].volt, lut[1].cur,
 170                                 bat->pdata->internal_impedance);
 171                         if (full_volt < lut_volt1 && full_volt >= lut_volt2) {
 172                                 new_level = (lut[1].level +
 173                                         (lut[0].level - lut[1].level) *
 174                                         (full_volt - lut_volt2) /
 175                                         (lut_volt1 - lut_volt2)) * 1000;
 176                                 break;
 177                         }
 178                         new_level = lut[1].level * 1000;
 179                         lut++;
 180                 }
 181         }
 182
 183         bat->level = new_level;
 184
 185         switch (psp) {
 186         case POWER_SUPPLY_PROP_STATUS:
 187                 if (bat->pdata->gpio_charge_finished < 0)
 188                         val->intval = bat->level == 100000 ?
 189                                 POWER_SUPPLY_STATUS_FULL : bat->status;
 190                 else
 191                         val->intval = bat->status;
 192                 return 0;
 193         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 194                 val->intval = 100000;
 195                 return 0;
 196         case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
 197                 val->intval = 0;
 198                 return 0;
 199         case POWER_SUPPLY_PROP_CHARGE_NOW:
 200                 val->intval = bat->level;
 201                 return 0;
 202         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 203                 val->intval = bat->volt_value;
 204                 return 0;
 205         case POWER_SUPPLY_PROP_CURRENT_NOW:
 206                 val->intval = bat->cur_value;
 207                 return 0;
 208         default:
 209                 return -EINVAL;
 210         }
 211 }
 212
 213 static struct s3c_adc_bat main_bat = {
 214         .psy = {
 215                 .name                   = "main-battery",
 216                 .type                   = POWER_SUPPLY_TYPE_BATTERY,
 217                 .properties             = s3c_adc_main_bat_props,
 218                 .num_properties         = ARRAY_SIZE(s3c_adc_main_bat_props),
 219                 .get_property           = s3c_adc_bat_get_property,
 220                 .external_power_changed = s3c_adc_bat_ext_power_changed,
 221                 .use_for_apm            = 1,
 222         },
 223 };
 224
 225 static void s3c_adc_bat_work(struct work_struct *work)
 226 {
 227         struct s3c_adc_bat *bat = &main_bat;
 228         int is_charged;
 229         int is_plugged;
 230         static int was_plugged;
 231
 232         is_plugged = power_supply_am_i_supplied(&bat->psy);
 233         bat->cable_plugged = is_plugged;
 234         if (is_plugged != was_plugged) {
 235                 was_plugged = is_plugged;
 236                 if (is_plugged) {
 237                         if (bat->pdata->enable_charger)
 238                                 bat->pdata->enable_charger();
 239                         bat->status = POWER_SUPPLY_STATUS_CHARGING;
 240                 } else {
 241                         if (bat->pdata->disable_charger)
 242                                 bat->pdata->disable_charger();
 243                         bat->status = POWER_SUPPLY_STATUS_DISCHARGING;
 244                 }
 245         } else {
 246                 if ((bat->pdata->gpio_charge_finished >= 0) && is_plugged) {
 247                         is_charged = charge_finished(&main_bat);
 248                         if (is_charged) {
 249                                 if (bat->pdata->disable_charger)
 250                                         bat->pdata->disable_charger();
 251                                 bat->status = POWER_SUPPLY_STATUS_FULL;
 252                         } else {
 253                                 if (bat->pdata->enable_charger)
 254                                         bat->pdata->enable_charger();
 255                                 bat->status = POWER_SUPPLY_STATUS_CHARGING;
 256                         }
 257                 }
 258         }
 259
 260         power_supply_changed(&bat->psy);
 261 }
 262
 263 static irqreturn_t s3c_adc_bat_charged(int irq, void *dev_id)
 264 {
 265         schedule_delayed_work(&bat_work,
 266                 msecs_to_jiffies(JITTER_DELAY));
 267         return IRQ_HANDLED;
 268 }
 269
 270 static int __devinit s3c_adc_bat_probe(struct platform_device *pdev)
 271 {
 272         struct s3c_adc_client   *client;
 273         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 274         int ret;
 275
 276         client = s3c_adc_register(pdev, NULL, NULL, 0);
 277         if (IS_ERR(client)) {
 278                 dev_err(&pdev->dev, "cannot register adc\n");
 279                 return PTR_ERR(client);
 280         }
 281
 282         platform_set_drvdata(pdev, client);
 283
 284         main_bat.client = client;
 285         main_bat.pdata = pdata;
 286         main_bat.volt_value = -1;
 287         main_bat.cur_value = -1;
 288         main_bat.cable_plugged = 0;
 289         main_bat.status = POWER_SUPPLY_STATUS_DISCHARGING;
 290
 291         ret = power_supply_register(&pdev->dev, &main_bat.psy);
 292         if (ret)
 293                 goto err_reg_main;
 294         if (pdata->backup_volt_mult) {
 295                 backup_bat.client = client;
 296                 backup_bat.pdata = pdev->dev.platform_data;
 297                 backup_bat.volt_value = -1;
 298                 ret = power_supply_register(&pdev->dev, &backup_bat.psy);
 299                 if (ret)
 300                         goto err_reg_backup;
 301         }
 302
 303         INIT_DELAYED_WORK(&bat_work, s3c_adc_bat_work);
 304
 305         if (pdata->gpio_charge_finished >= 0) {
 306                 ret = gpio_request(pdata->gpio_charge_finished, "charged");
 307                 if (ret)
 308                         goto err_gpio;
 309
 310                 ret = request_irq(gpio_to_irq(pdata->gpio_charge_finished),
 311                                 s3c_adc_bat_charged,
 312                                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 313                                 "battery charged", NULL);
 314                 if (ret)
 315                         goto err_irq;
 316         }
 317
 318         if (pdata->init) {
 319                 ret = pdata->init();
 320                 if (ret)
 321                         goto err_platform;
 322         }
 323
 324         dev_info(&pdev->dev, "successfully loaded\n");
 325         device_init_wakeup(&pdev->dev, 1);
 326
 327         /* Schedule timer to check current status */
 328         schedule_delayed_work(&bat_work,
 329                 msecs_to_jiffies(JITTER_DELAY));
 330
 331         return 0;
 332
 333 err_platform:
 334         if (pdata->gpio_charge_finished >= 0)
 335                 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 336 err_irq:
 337         if (pdata->gpio_charge_finished >= 0)
 338                 gpio_free(pdata->gpio_charge_finished);
 339 err_gpio:
 340         if (pdata->backup_volt_mult)
 341                 power_supply_unregister(&backup_bat.psy);
 342 err_reg_backup:
 343         power_supply_unregister(&main_bat.psy);
 344 err_reg_main:
 345         return ret;
 346 }
 347
 348 static int s3c_adc_bat_remove(struct platform_device *pdev)
 349 {
 350         struct s3c_adc_client *client = platform_get_drvdata(pdev);
 351         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 352
 353         power_supply_unregister(&main_bat.psy);
 354         if (pdata->backup_volt_mult)
 355                 power_supply_unregister(&backup_bat.psy);
 356
 357         s3c_adc_release(client);
 358
 359         if (pdata->gpio_charge_finished >= 0) {
 360                 free_irq(gpio_to_irq(pdata->gpio_charge_finished), NULL);
 361                 gpio_free(pdata->gpio_charge_finished);
 362         }
 363
 364         cancel_delayed_work(&bat_work);
 365
 366         if (pdata->exit)
 367                 pdata->exit();
 368
 369         return 0;
 370 }
 371
 372 #ifdef CONFIG_PM
 373 static int s3c_adc_bat_suspend(struct platform_device *pdev,
 374         pm_message_t state)
 375 {
 376         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 377
 378         if (pdata->gpio_charge_finished >= 0) {
 379                 if (device_may_wakeup(&pdev->dev))
 380                         enable_irq_wake(
 381                                 gpio_to_irq(pdata->gpio_charge_finished));
 382                 else {
 383                         disable_irq(gpio_to_irq(pdata->gpio_charge_finished));
 384                         main_bat.pdata->disable_charger();
 385                 }
 386         }
 387
 388         return 0;
 389 }
 390
 391 static int s3c_adc_bat_resume(struct platform_device *pdev)
 392 {
 393         struct s3c_adc_bat_pdata *pdata = pdev->dev.platform_data;
 394
 395         if (pdata->gpio_charge_finished >= 0) {
 396                 if (device_may_wakeup(&pdev->dev))
 397                         disable_irq_wake(
 398                                 gpio_to_irq(pdata->gpio_charge_finished));
 399                 else
 400                         enable_irq(gpio_to_irq(pdata->gpio_charge_finished));
 401         }
 402
 403         /* Schedule timer to check current status */
 404         schedule_delayed_work(&bat_work,
 405                 msecs_to_jiffies(JITTER_DELAY));
 406
 407         return 0;
 408 }
 409 #else
 410 #define s3c_adc_bat_suspend NULL
 411 #define s3c_adc_bat_resume NULL
 412 #endif
 413
 414 static struct platform_driver s3c_adc_bat_driver = {
 415         .driver         = {
 416                 .name   = "s3c-adc-battery",
 417         },
 418         .probe          = s3c_adc_bat_probe,
 419         .remove         = s3c_adc_bat_remove,
 420         .suspend        = s3c_adc_bat_suspend,
 421         .resume         = s3c_adc_bat_resume,
 422 };
 423
 424 static int __init s3c_adc_bat_init(void)
 425 {
 426         return platform_driver_register(&s3c_adc_bat_driver);
 427 }
 428 module_init(s3c_adc_bat_init);
 429
 430 static void __exit s3c_adc_bat_exit(void)
 431 {
 432         platform_driver_unregister(&s3c_adc_bat_driver);
 433 }
 434 module_exit(s3c_adc_bat_exit);
 435
 436 MODULE_AUTHOR("Vasily Khoruzhick <anarsoul@gmail.com>");
 437 MODULE_DESCRIPTION("iPAQ H1930/H1940/RX1950 battery controller driver");
 438 MODULE_LICENSE("GPL");