drivers/staging/nvec/nvec_power.c

   1 #include <linux/module.h>
   2 #include <linux/platform_device.h>
   3 #include <linux/err.h>
   4 #include <linux/power_supply.h>
   5 #include <linux/slab.h>
   6 #include <linux/workqueue.h>
   7 #include <linux/delay.h>
   8 #include "nvec.h"
   9
  10 struct nvec_power
  11 {
  12         struct notifier_block notifier;
  13         struct delayed_work poller;
  14         struct nvec_chip *nvec;
  15         int on;
  16         int bat_present;
  17         int bat_status;
  18         int bat_voltage_now;
  19         int bat_current_now;
  20         int bat_current_avg;
  21         int time_remain;
  22         int charge_full_design;
  23         int charge_last_full;
  24         int critical_capacity;
  25         int capacity_remain;
  26         int bat_temperature;
  27         int bat_cap;
  28         int bat_type_enum;
  29         char bat_manu[30];
  30         char bat_model[30];
  31         char bat_type[30];
  32 };
  33
  34 enum {
  35         SLOT_STATUS,
  36         VOLTAGE,
  37         TIME_REMAINING,
  38         CURRENT,
  39         AVERAGE_CURRENT,
  40         AVERAGING_TIME_INTERVAL,
  41         CAPACITY_REMAINING,
  42         LAST_FULL_CHARGE_CAPACITY,
  43         DESIGN_CAPACITY,
  44         CRITICAL_CAPACITY,
  45         TEMPERATURE,
  46         MANUFACTURER,
  47         MODEL,
  48         TYPE,
  49 };
  50
  51 enum {
  52         AC,
  53         BAT,
  54 };
  55
  56 struct bat_response {
  57         u8 event_type;
  58         u8 length;
  59         u8 sub_type;
  60         u8 status;
  61         union { /* payload */
  62                 char plc[30];
  63                 u16 plu;
  64                 s16 pls;
  65         };
  66 };
  67
  68 static struct power_supply nvec_bat_psy;
  69 static struct power_supply nvec_psy;
  70
  71 static int nvec_power_notifier(struct notifier_block *nb,
  72                                  unsigned long event_type, void *data)
  73 {
  74         struct nvec_power *power = container_of(nb, struct nvec_power, notifier);
  75         struct bat_response *res = (struct bat_response *)data;
  76
  77         if (event_type != NVEC_SYS)
  78                 return NOTIFY_DONE;
  79
  80         if(res->sub_type == 0)
  81         {
  82                 if (power->on != res->plu)
  83                 {
  84                         power->on = res->plu;
  85                         power_supply_changed(&nvec_psy);
  86                 }
  87                 return NOTIFY_STOP;
  88         }
  89         return NOTIFY_OK;
  90 }
  91
  92 static const int bat_init[] =
  93 {
  94         LAST_FULL_CHARGE_CAPACITY, DESIGN_CAPACITY, CRITICAL_CAPACITY,
  95         MANUFACTURER, MODEL, TYPE,
  96 };
  97
  98 static void get_bat_mfg_data(struct nvec_power *power)
  99 {
 100         int i;
 101         char buf[] = { '\x02', '\x00' };
 102
 103         for (i = 0; i < ARRAY_SIZE(bat_init); i++)
 104         {
 105                 buf[1] = bat_init[i];
 106                 nvec_write_async(power->nvec, buf, 2);
 107         }
 108 }
 109
 110 static int nvec_power_bat_notifier(struct notifier_block *nb,
 111                                  unsigned long event_type, void *data)
 112 {
 113         struct nvec_power *power = container_of(nb, struct nvec_power, notifier);
 114         struct bat_response *res = (struct bat_response *)data;
 115         int status_changed = 0;
 116
 117         if (event_type != NVEC_BAT)
 118                 return NOTIFY_DONE;
 119
 120         switch(res->sub_type)
 121         {
 122                 case SLOT_STATUS:
 123                         if (res->plc[0] & 1)
 124                         {
 125                                 if (power->bat_present == 0)
 126                                 {
 127                                         status_changed = 1;
 128                                         get_bat_mfg_data(power);
 129                                 }
 130
 131                                 power->bat_present = 1;
 132
 133                                 switch ((res->plc[0] >> 1) & 3)
 134                                 {
 135                                         case 0:
 136                                                 power->bat_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 137                                                 break;
 138                                         case 1:
 139                                                 power->bat_status = POWER_SUPPLY_STATUS_CHARGING;
 140                                                 break;
 141                                         case 2:
 142                                                 power->bat_status = POWER_SUPPLY_STATUS_DISCHARGING;
 143                                                 break;
 144                                         default:
 145                                                 power->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
 146                                 }
 147                         } else {
 148                                 if (power->bat_present == 1)
 149                                         status_changed = 1;
 150
 151                                 power->bat_present = 0;
 152                                 power->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
 153                         }
 154                         power->bat_cap = res->plc[1];
 155                         if (status_changed)
 156                                 power_supply_changed(&nvec_bat_psy);
 157                         break;
 158                 case VOLTAGE:
 159                         power->bat_voltage_now = res->plu * 1000;
 160                         break;
 161                 case TIME_REMAINING:
 162                         power->time_remain = res->plu * 3600;
 163                         break;
 164                 case CURRENT:
 165                         power->bat_current_now = res->pls * 1000;
 166                         break;
 167                 case AVERAGE_CURRENT:
 168                         power->bat_current_avg = res->pls * 1000;
 169                         break;
 170                 case CAPACITY_REMAINING:
 171                         power->capacity_remain = res->plu * 1000;
 172                         break;
 173                 case LAST_FULL_CHARGE_CAPACITY:
 174                         power->charge_last_full = res->plu * 1000;
 175                         break;
 176                 case DESIGN_CAPACITY:
 177                         power->charge_full_design = res->plu * 1000;
 178                         break;
 179                 case CRITICAL_CAPACITY:
 180                         power->critical_capacity = res->plu * 1000;
 181                         break;
 182                 case TEMPERATURE:
 183                         power->bat_temperature = res->plu - 2732;
 184                         break;
 185                 case MANUFACTURER:
 186                         memcpy(power->bat_manu, &res->plc, res->length-2);
 187                         power->bat_model[res->length-2] = '\0';
 188                         break;
 189                 case MODEL:
 190                         memcpy(power->bat_model, &res->plc, res->length-2);
 191                         power->bat_model[res->length-2] = '\0';
 192                         break;
 193                 case TYPE:
 194                         memcpy(power->bat_type, &res->plc, res->length-2);
 195                         power->bat_type[res->length-2] = '\0';
 196                         /* this differs a little from the spec
 197                            fill in more if you find some */
 198                         if (!strncmp(power->bat_type, "Li", 30))
 199                                 power->bat_type_enum = POWER_SUPPLY_TECHNOLOGY_LION;
 200                         else
 201                                 power->bat_type_enum = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 202                         break;
 203                 default:
 204                         return NOTIFY_STOP;
 205         }
 206
 207         return NOTIFY_STOP;
 208 }
 209
 210 static int nvec_power_get_property(struct power_supply *psy,
 211                                 enum power_supply_property psp,
 212                                 union power_supply_propval *val)
 213 {
 214         struct nvec_power *power = dev_get_drvdata(psy->dev->parent);
 215         switch (psp) {
 216         case POWER_SUPPLY_PROP_ONLINE:
 217                 val->intval = power->on;
 218                 break;
 219         default:
 220                 return -EINVAL;
 221         }
 222         return 0;
 223 }
 224
 225 static int nvec_battery_get_property(struct power_supply *psy,
 226                                 enum power_supply_property psp,
 227                                 union power_supply_propval *val)
 228 {
 229         struct nvec_power *power = dev_get_drvdata(psy->dev->parent);
 230
 231         switch(psp)
 232         {
 233                 case POWER_SUPPLY_PROP_STATUS:
 234                         val->intval = power->bat_status;
 235                         break;
 236                 case POWER_SUPPLY_PROP_CAPACITY:
 237                         val->intval = power->bat_cap;
 238                         break;
 239                 case POWER_SUPPLY_PROP_PRESENT:
 240                         val->intval = power->bat_present;
 241                         break;
 242                 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 243                         val->intval = power->bat_voltage_now;
 244                         break;
 245                 case POWER_SUPPLY_PROP_CURRENT_NOW:
 246                         val->intval = power->bat_current_now;
 247                         break;
 248                 case POWER_SUPPLY_PROP_CURRENT_AVG:
 249                         val->intval = power->bat_current_avg;
 250                         break;
 251                 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 252                         val->intval = power->time_remain;
 253                         break;
 254                 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 255                         val->intval = power->charge_full_design;
 256                         break;
 257                 case POWER_SUPPLY_PROP_CHARGE_FULL:
 258                         val->intval = power->charge_last_full;
 259                         break;
 260                 case POWER_SUPPLY_PROP_CHARGE_EMPTY:
 261                         val->intval = power->critical_capacity;
 262                         break;
 263                 case POWER_SUPPLY_PROP_CHARGE_NOW:
 264                         val->intval = power->capacity_remain;
 265                         break;
 266                 case POWER_SUPPLY_PROP_TEMP:
 267                         val->intval = power->bat_temperature;
 268                         break;
 269                 case POWER_SUPPLY_PROP_MANUFACTURER:
 270                         val->strval = power->bat_manu;
 271                         break;
 272                 case POWER_SUPPLY_PROP_MODEL_NAME:
 273                         val->strval = power->bat_model;
 274                         break;
 275                 case POWER_SUPPLY_PROP_TECHNOLOGY:
 276                         val->intval = power->bat_type_enum;
 277                         break;
 278                 default:
 279                         return -EINVAL;
 280                 }
 281         return 0;
 282 }
 283
 284 static enum power_supply_property nvec_power_props[] = {
 285         POWER_SUPPLY_PROP_ONLINE,
 286 };
 287
 288 static enum power_supply_property nvec_battery_props[] = {
 289         POWER_SUPPLY_PROP_STATUS,
 290         POWER_SUPPLY_PROP_PRESENT,
 291         POWER_SUPPLY_PROP_CAPACITY,
 292         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 293         POWER_SUPPLY_PROP_CURRENT_NOW,
 294 #ifdef EC_FULL_DIAG
 295         POWER_SUPPLY_PROP_CURRENT_AVG,
 296         POWER_SUPPLY_PROP_TEMP,
 297         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 298 #endif
 299         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 300         POWER_SUPPLY_PROP_CHARGE_FULL,
 301         POWER_SUPPLY_PROP_CHARGE_EMPTY,
 302         POWER_SUPPLY_PROP_CHARGE_NOW,
 303         POWER_SUPPLY_PROP_MANUFACTURER,
 304         POWER_SUPPLY_PROP_MODEL_NAME,
 305         POWER_SUPPLY_PROP_TECHNOLOGY,
 306 };
 307
 308 static char *nvec_power_supplied_to[] = {
 309         "battery",
 310 };
 311
 312 static struct power_supply nvec_bat_psy = {
 313         .name           = "battery",
 314         .type           = POWER_SUPPLY_TYPE_BATTERY,
 315         .properties     = nvec_battery_props,
 316         .num_properties = ARRAY_SIZE(nvec_battery_props),
 317         .get_property   = nvec_battery_get_property,
 318 };
 319
 320 static struct power_supply nvec_psy = {
 321         .name = "ac",
 322         .type = POWER_SUPPLY_TYPE_MAINS,
 323         .supplied_to = nvec_power_supplied_to,
 324         .num_supplicants = ARRAY_SIZE(nvec_power_supplied_to),
 325         .properties = nvec_power_props,
 326         .num_properties = ARRAY_SIZE(nvec_power_props),
 327         .get_property = nvec_power_get_property,
 328 };
 329
 330 static int counter = 0;
 331 static int const bat_iter[] =
 332 {
 333         SLOT_STATUS, VOLTAGE, CURRENT, CAPACITY_REMAINING,
 334 #ifdef EC_FULL_DIAG
 335         AVERAGE_CURRENT, TEMPERATURE, TIME_REMAINING,
 336 #endif
 337 };
 338
 339 static void nvec_power_poll(struct work_struct *work)
 340 {
 341         char buf[] = { '\x01', '\x00' };
 342         struct nvec_power *power = container_of(work, struct nvec_power,
 343                  poller.work);
 344
 345         if (counter >= ARRAY_SIZE(bat_iter))
 346                 counter = 0;
 347
 348 /* AC status via sys req */
 349         nvec_write_async(power->nvec, buf, 2);
 350         msleep(100);
 351
 352 /* select a battery request function via round robin
 353    doing it all at once seems to overload the power supply */
 354         buf[0] = '\x02'; /* battery */
 355         buf[1] = bat_iter[counter++];
 356         nvec_write_async(power->nvec, buf, 2);
 357
 358 //      printk("%02x %02x\n", buf[0], buf[1]);
 359
 360         schedule_delayed_work(to_delayed_work(work), msecs_to_jiffies(5000));
 361 };
 362
 363 static int __devinit nvec_power_probe(struct platform_device *pdev)
 364 {
 365         struct power_supply *psy;
 366         struct nvec_power *power = kzalloc(sizeof(struct nvec_power), GFP_NOWAIT);
 367         struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
 368
 369         dev_set_drvdata(&pdev->dev, power);
 370         power->nvec = nvec;
 371
 372         switch (pdev->id) {
 373         case AC:
 374                 psy = &nvec_psy;
 375
 376                 power->notifier.notifier_call = nvec_power_notifier;
 377
 378                 INIT_DELAYED_WORK(&power->poller, nvec_power_poll);
 379                 schedule_delayed_work(&power->poller, msecs_to_jiffies(5000));
 380                 break;
 381         case BAT:
 382                 psy = &nvec_bat_psy;
 383
 384                 power->notifier.notifier_call = nvec_power_bat_notifier;
 385                 break;
 386         default:
 387                 kfree(power);
 388                 return -ENODEV;
 389         }
 390
 391         nvec_register_notifier(nvec, &power->notifier, NVEC_SYS);
 392
 393         if (pdev->id == BAT)
 394                 get_bat_mfg_data(power);
 395
 396         return power_supply_register(&pdev->dev, psy);
 397 }
 398
 399 static struct platform_driver nvec_power_driver = {
 400         .probe = nvec_power_probe,
 401 //      .remove = __devexit_p(nvec_power_remove),
 402         .driver = {
 403                 .name = "nvec-power",
 404                 .owner = THIS_MODULE,
 405         }
 406 };
 407
 408 static int __init nvec_power_init(void)
 409 {
 410         return platform_driver_register(&nvec_power_driver);
 411 }
 412
 413 module_init(nvec_power_init);
 414
 415 MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
 416 MODULE_LICENSE("GPL");
 417 MODULE_DESCRIPTION("NVEC battery and AC driver");
 418 MODULE_ALIAS("platform:nvec-power");