kernel/drivers/staging/nvec/nvec_power.c

   1 /*
   2  * nvec_power: power supply driver for a NVIDIA compliant embedded controller
   3  *
   4  * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
   5  *
   6  * Authors:  Ilya Petrov <ilya.muromec@gmail.com>
   7  *           Marc Dietrich <marvin24@gmx.de>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file "COPYING" in the main directory of this archive
  11  * for more details.
  12  *
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/err.h>
  18 #include <linux/power_supply.h>
  19 #include <linux/slab.h>
  20 #include <linux/workqueue.h>
  21 #include <linux/delay.h>
  22
  23 #include "nvec.h"
  24
  25 #define GET_SYSTEM_STATUS 0x00
  26
  27 struct nvec_power {
  28         struct notifier_block notifier;
  29         struct delayed_work poller;
  30         struct nvec_chip *nvec;
  31         int on;
  32         int bat_present;
  33         int bat_status;
  34         int bat_voltage_now;
  35         int bat_current_now;
  36         int bat_current_avg;
  37         int time_remain;
  38         int charge_full_design;
  39         int charge_last_full;
  40         int critical_capacity;
  41         int capacity_remain;
  42         int bat_temperature;
  43         int bat_cap;
  44         int bat_type_enum;
  45         char bat_manu[30];
  46         char bat_model[30];
  47         char bat_type[30];
  48 };
  49
  50 enum {
  51         SLOT_STATUS,
  52         VOLTAGE,
  53         TIME_REMAINING,
  54         CURRENT,
  55         AVERAGE_CURRENT,
  56         AVERAGING_TIME_INTERVAL,
  57         CAPACITY_REMAINING,
  58         LAST_FULL_CHARGE_CAPACITY,
  59         DESIGN_CAPACITY,
  60         CRITICAL_CAPACITY,
  61         TEMPERATURE,
  62         MANUFACTURER,
  63         MODEL,
  64         TYPE,
  65 };
  66
  67 enum {
  68         AC,
  69         BAT,
  70 };
  71
  72 struct bat_response {
  73         u8 event_type;
  74         u8 length;
  75         u8 sub_type;
  76         u8 status;
  77         /* payload */
  78         union {
  79                 char plc[30];
  80                 u16 plu;
  81                 s16 pls;
  82         };
  83 };
  84
  85 static struct power_supply *nvec_bat_psy;
  86 static struct power_supply *nvec_psy;
  87
  88 static int nvec_power_notifier(struct notifier_block *nb,
  89                                unsigned long event_type, void *data)
  90 {
  91         struct nvec_power *power =
  92             container_of(nb, struct nvec_power, notifier);
  93         struct bat_response *res = (struct bat_response *)data;
  94
  95         if (event_type != NVEC_SYS)
  96                 return NOTIFY_DONE;
  97
  98         if (res->sub_type == 0) {
  99                 if (power->on != res->plu) {
 100                         power->on = res->plu;
 101                         power_supply_changed(nvec_psy);
 102                 }
 103                 return NOTIFY_STOP;
 104         }
 105         return NOTIFY_OK;
 106 }
 107
 108 static const int bat_init[] = {
 109         LAST_FULL_CHARGE_CAPACITY, DESIGN_CAPACITY, CRITICAL_CAPACITY,
 110         MANUFACTURER, MODEL, TYPE,
 111 };
 112
 113 static void get_bat_mfg_data(struct nvec_power *power)
 114 {
 115         int i;
 116         char buf[] = { NVEC_BAT, SLOT_STATUS };
 117
 118         for (i = 0; i < ARRAY_SIZE(bat_init); i++) {
 119                 buf[1] = bat_init[i];
 120                 nvec_write_async(power->nvec, buf, 2);
 121         }
 122 }
 123
 124 static int nvec_power_bat_notifier(struct notifier_block *nb,
 125                                    unsigned long event_type, void *data)
 126 {
 127         struct nvec_power *power =
 128             container_of(nb, struct nvec_power, notifier);
 129         struct bat_response *res = (struct bat_response *)data;
 130         int status_changed = 0;
 131
 132         if (event_type != NVEC_BAT)
 133                 return NOTIFY_DONE;
 134
 135         switch (res->sub_type) {
 136         case SLOT_STATUS:
 137                 if (res->plc[0] & 1) {
 138                         if (power->bat_present == 0) {
 139                                 status_changed = 1;
 140                                 get_bat_mfg_data(power);
 141                         }
 142
 143                         power->bat_present = 1;
 144
 145                         switch ((res->plc[0] >> 1) & 3) {
 146                         case 0:
 147                                 power->bat_status =
 148                                     POWER_SUPPLY_STATUS_NOT_CHARGING;
 149                                 break;
 150                         case 1:
 151                                 power->bat_status =
 152                                     POWER_SUPPLY_STATUS_CHARGING;
 153                                 break;
 154                         case 2:
 155                                 power->bat_status =
 156                                     POWER_SUPPLY_STATUS_DISCHARGING;
 157                                 break;
 158                         default:
 159                                 power->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
 160                         }
 161                 } else {
 162                         if (power->bat_present == 1)
 163                                 status_changed = 1;
 164
 165                         power->bat_present = 0;
 166                         power->bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
 167                 }
 168                 power->bat_cap = res->plc[1];
 169                 if (status_changed)
 170                         power_supply_changed(nvec_bat_psy);
 171                 break;
 172         case VOLTAGE:
 173                 power->bat_voltage_now = res->plu * 1000;
 174                 break;
 175         case TIME_REMAINING:
 176                 power->time_remain = res->plu * 3600;
 177                 break;
 178         case CURRENT:
 179                 power->bat_current_now = res->pls * 1000;
 180                 break;
 181         case AVERAGE_CURRENT:
 182                 power->bat_current_avg = res->pls * 1000;
 183                 break;
 184         case CAPACITY_REMAINING:
 185                 power->capacity_remain = res->plu * 1000;
 186                 break;
 187         case LAST_FULL_CHARGE_CAPACITY:
 188                 power->charge_last_full = res->plu * 1000;
 189                 break;
 190         case DESIGN_CAPACITY:
 191                 power->charge_full_design = res->plu * 1000;
 192                 break;
 193         case CRITICAL_CAPACITY:
 194                 power->critical_capacity = res->plu * 1000;
 195                 break;
 196         case TEMPERATURE:
 197                 power->bat_temperature = res->plu - 2732;
 198                 break;
 199         case MANUFACTURER:
 200                 memcpy(power->bat_manu, &res->plc, res->length - 2);
 201                 power->bat_model[res->length - 2] = '\0';
 202                 break;
 203         case MODEL:
 204                 memcpy(power->bat_model, &res->plc, res->length - 2);
 205                 power->bat_model[res->length - 2] = '\0';
 206                 break;
 207         case TYPE:
 208                 memcpy(power->bat_type, &res->plc, res->length - 2);
 209                 power->bat_type[res->length - 2] = '\0';
 210                 /* this differs a little from the spec
 211                    fill in more if you find some */
 212                 if (!strncmp(power->bat_type, "Li", 30))
 213                         power->bat_type_enum = POWER_SUPPLY_TECHNOLOGY_LION;
 214                 else
 215                         power->bat_type_enum = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 216                 break;
 217         default:
 218                 return NOTIFY_STOP;
 219         }
 220
 221         return NOTIFY_STOP;
 222 }
 223
 224 static int nvec_power_get_property(struct power_supply *psy,
 225                                    enum power_supply_property psp,
 226                                    union power_supply_propval *val)
 227 {
 228         struct nvec_power *power = dev_get_drvdata(psy->dev.parent);
 229
 230         switch (psp) {
 231         case POWER_SUPPLY_PROP_ONLINE:
 232                 val->intval = power->on;
 233                 break;
 234         default:
 235                 return -EINVAL;
 236         }
 237         return 0;
 238 }
 239
 240 static int nvec_battery_get_property(struct power_supply *psy,
 241                                      enum power_supply_property psp,
 242                                      union power_supply_propval *val)
 243 {
 244         struct nvec_power *power = dev_get_drvdata(psy->dev.parent);
 245
 246         switch (psp) {
 247         case POWER_SUPPLY_PROP_STATUS:
 248                 val->intval = power->bat_status;
 249                 break;
 250         case POWER_SUPPLY_PROP_CAPACITY:
 251                 val->intval = power->bat_cap;
 252                 break;
 253         case POWER_SUPPLY_PROP_PRESENT:
 254                 val->intval = power->bat_present;
 255                 break;
 256         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 257                 val->intval = power->bat_voltage_now;
 258                 break;
 259         case POWER_SUPPLY_PROP_CURRENT_NOW:
 260                 val->intval = power->bat_current_now;
 261                 break;
 262         case POWER_SUPPLY_PROP_CURRENT_AVG:
 263                 val->intval = power->bat_current_avg;
 264                 break;
 265         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 266                 val->intval = power->time_remain;
 267                 break;
 268         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 269                 val->intval = power->charge_full_design;
 270                 break;
 271         case POWER_SUPPLY_PROP_CHARGE_FULL:
 272                 val->intval = power->charge_last_full;
 273                 break;
 274         case POWER_SUPPLY_PROP_CHARGE_EMPTY:
 275                 val->intval = power->critical_capacity;
 276                 break;
 277         case POWER_SUPPLY_PROP_CHARGE_NOW:
 278                 val->intval = power->capacity_remain;
 279                 break;
 280         case POWER_SUPPLY_PROP_TEMP:
 281                 val->intval = power->bat_temperature;
 282                 break;
 283         case POWER_SUPPLY_PROP_MANUFACTURER:
 284                 val->strval = power->bat_manu;
 285                 break;
 286         case POWER_SUPPLY_PROP_MODEL_NAME:
 287                 val->strval = power->bat_model;
 288                 break;
 289         case POWER_SUPPLY_PROP_TECHNOLOGY:
 290                 val->intval = power->bat_type_enum;
 291                 break;
 292         default:
 293                 return -EINVAL;
 294         }
 295         return 0;
 296 }
 297
 298 static enum power_supply_property nvec_power_props[] = {
 299         POWER_SUPPLY_PROP_ONLINE,
 300 };
 301
 302 static enum power_supply_property nvec_battery_props[] = {
 303         POWER_SUPPLY_PROP_STATUS,
 304         POWER_SUPPLY_PROP_PRESENT,
 305         POWER_SUPPLY_PROP_CAPACITY,
 306         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 307         POWER_SUPPLY_PROP_CURRENT_NOW,
 308 #ifdef EC_FULL_DIAG
 309         POWER_SUPPLY_PROP_CURRENT_AVG,
 310         POWER_SUPPLY_PROP_TEMP,
 311         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 312 #endif
 313         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 314         POWER_SUPPLY_PROP_CHARGE_FULL,
 315         POWER_SUPPLY_PROP_CHARGE_EMPTY,
 316         POWER_SUPPLY_PROP_CHARGE_NOW,
 317         POWER_SUPPLY_PROP_MANUFACTURER,
 318         POWER_SUPPLY_PROP_MODEL_NAME,
 319         POWER_SUPPLY_PROP_TECHNOLOGY,
 320 };
 321
 322 static char *nvec_power_supplied_to[] = {
 323         "battery",
 324 };
 325
 326 static const struct power_supply_desc nvec_bat_psy_desc = {
 327         .name = "battery",
 328         .type = POWER_SUPPLY_TYPE_BATTERY,
 329         .properties = nvec_battery_props,
 330         .num_properties = ARRAY_SIZE(nvec_battery_props),
 331         .get_property = nvec_battery_get_property,
 332 };
 333
 334 static const struct power_supply_desc nvec_psy_desc = {
 335         .name = "ac",
 336         .type = POWER_SUPPLY_TYPE_MAINS,
 337         .properties = nvec_power_props,
 338         .num_properties = ARRAY_SIZE(nvec_power_props),
 339         .get_property = nvec_power_get_property,
 340 };
 341
 342 static int counter;
 343 static int const bat_iter[] = {
 344         SLOT_STATUS, VOLTAGE, CURRENT, CAPACITY_REMAINING,
 345 #ifdef EC_FULL_DIAG
 346         AVERAGE_CURRENT, TEMPERATURE, TIME_REMAINING,
 347 #endif
 348 };
 349
 350 static void nvec_power_poll(struct work_struct *work)
 351 {
 352         char buf[] = { NVEC_SYS, GET_SYSTEM_STATUS };
 353         struct nvec_power *power = container_of(work, struct nvec_power,
 354                                                 poller.work);
 355
 356         if (counter >= ARRAY_SIZE(bat_iter))
 357                 counter = 0;
 358
 359 /* AC status via sys req */
 360         nvec_write_async(power->nvec, buf, 2);
 361         msleep(100);
 362
 363 /* select a battery request function via round robin
 364    doing it all at once seems to overload the power supply */
 365         buf[0] = NVEC_BAT;
 366         buf[1] = bat_iter[counter++];
 367         nvec_write_async(power->nvec, buf, 2);
 368
 369         schedule_delayed_work(to_delayed_work(work), msecs_to_jiffies(5000));
 370 };
 371
 372 static int nvec_power_probe(struct platform_device *pdev)
 373 {
 374         struct power_supply **psy;
 375         const struct power_supply_desc *psy_desc;
 376         struct nvec_power *power;
 377         struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
 378         struct power_supply_config psy_cfg = {};
 379
 380         power = devm_kzalloc(&pdev->dev, sizeof(struct nvec_power), GFP_NOWAIT);
 381         if (!power)
 382                 return -ENOMEM;
 383
 384         dev_set_drvdata(&pdev->dev, power);
 385         power->nvec = nvec;
 386
 387         switch (pdev->id) {
 388         case AC:
 389                 psy = &nvec_psy;
 390                 psy_desc = &nvec_psy_desc;
 391                 psy_cfg.supplied_to = nvec_power_supplied_to;
 392                 psy_cfg.num_supplicants = ARRAY_SIZE(nvec_power_supplied_to);
 393
 394                 power->notifier.notifier_call = nvec_power_notifier;
 395
 396                 INIT_DELAYED_WORK(&power->poller, nvec_power_poll);
 397                 schedule_delayed_work(&power->poller, msecs_to_jiffies(5000));
 398                 break;
 399         case BAT:
 400                 psy = &nvec_bat_psy;
 401                 psy_desc = &nvec_bat_psy_desc;
 402
 403                 power->notifier.notifier_call = nvec_power_bat_notifier;
 404                 break;
 405         default:
 406                 return -ENODEV;
 407         }
 408
 409         nvec_register_notifier(nvec, &power->notifier, NVEC_SYS);
 410
 411         if (pdev->id == BAT)
 412                 get_bat_mfg_data(power);
 413
 414         *psy = power_supply_register(&pdev->dev, psy_desc, &psy_cfg);
 415
 416         return PTR_ERR_OR_ZERO(*psy);
 417 }
 418
 419 static int nvec_power_remove(struct platform_device *pdev)
 420 {
 421         struct nvec_power *power = platform_get_drvdata(pdev);
 422
 423         cancel_delayed_work_sync(&power->poller);
 424         nvec_unregister_notifier(power->nvec, &power->notifier);
 425         switch (pdev->id) {
 426         case AC:
 427                 power_supply_unregister(nvec_psy);
 428                 break;
 429         case BAT:
 430                 power_supply_unregister(nvec_bat_psy);
 431         }
 432
 433         return 0;
 434 }
 435
 436 static struct platform_driver nvec_power_driver = {
 437         .probe = nvec_power_probe,
 438         .remove = nvec_power_remove,
 439         .driver = {
 440                    .name = "nvec-power",
 441                    }
 442 };
 443
 444 module_platform_driver(nvec_power_driver);
 445
 446 MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
 447 MODULE_LICENSE("GPL");
 448 MODULE_DESCRIPTION("NVEC battery and AC driver");
 449 MODULE_ALIAS("platform:nvec-power");