drivers/power/supply/ab8500

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
ab8500_btemp_get
ab8500_btemp_batctrl_volt_to_res
ab8500_btemp_read_batctrl_voltage
ab8500_btemp_curr_source_enable
ab8500_btemp_get_batctrl_res
ab8500_btemp_res_to_temp
ab8500_btemp_measure_temp
ab8500_btemp_id
ab8500_btemp_periodic_work
ab8500_btemp_batctrlindb_handler
ab8500_btemp_templow_handler
ab8500_btemp_temphigh_handler
ab8500_btemp_lowmed_handler
ab8500_btemp_medhigh_handler
ab8500_btemp_periodic
ab8500_btemp_get_temp
ab8500_btemp_get_batctrl_temp
ab8500_btemp_get_property
ab8500_btemp_get_ext_psy_data
ab8500_btemp_external_power_changed
ab8500_btemp_resume
ab8500_btemp_suspend
ab8500_btemp_remove
ab8500_btemp_probe
ab8500_btemp_init
ab8500_btemp_exit
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) ST-Ericsson SA 2012
   4  *
   5  * Battery temperature driver for AB8500
   6  *
   7  * Author:
   8  *      Johan Palsson <johan.palsson@stericsson.com>
   9  *      Karl Komierowski <karl.komierowski@stericsson.com>
  10  *      Arun R Murthy <arun.murthy@stericsson.com>
  11  */
  12 
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/device.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/delay.h>
  18 #include <linux/slab.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/power_supply.h>
  21 #include <linux/completion.h>
  22 #include <linux/workqueue.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/of.h>
  25 #include <linux/mfd/core.h>
  26 #include <linux/mfd/abx500.h>
  27 #include <linux/mfd/abx500/ab8500.h>
  28 #include <linux/mfd/abx500/ab8500-bm.h>
  29 #include <linux/mfd/abx500/ab8500-gpadc.h>
  30 
  31 #define VTVOUT_V                        1800
  32 
  33 #define BTEMP_THERMAL_LOW_LIMIT         -10
  34 #define BTEMP_THERMAL_MED_LIMIT         0
  35 #define BTEMP_THERMAL_HIGH_LIMIT_52     52
  36 #define BTEMP_THERMAL_HIGH_LIMIT_57     57
  37 #define BTEMP_THERMAL_HIGH_LIMIT_62     62
  38 
  39 #define BTEMP_BATCTRL_CURR_SRC_7UA      7
  40 #define BTEMP_BATCTRL_CURR_SRC_20UA     20
  41 
  42 #define BTEMP_BATCTRL_CURR_SRC_16UA     16
  43 #define BTEMP_BATCTRL_CURR_SRC_18UA     18
  44 
  45 #define BTEMP_BATCTRL_CURR_SRC_60UA     60
  46 #define BTEMP_BATCTRL_CURR_SRC_120UA    120
  47 
  48 /**
  49  * struct ab8500_btemp_interrupts - ab8500 interrupts
  50  * @name:       name of the interrupt
  51  * @isr         function pointer to the isr
  52  */
  53 struct ab8500_btemp_interrupts {
  54         char *name;
  55         irqreturn_t (*isr)(int irq, void *data);
  56 };
  57 
  58 struct ab8500_btemp_events {
  59         bool batt_rem;
  60         bool btemp_high;
  61         bool btemp_medhigh;
  62         bool btemp_lowmed;
  63         bool btemp_low;
  64         bool ac_conn;
  65         bool usb_conn;
  66 };
  67 
  68 struct ab8500_btemp_ranges {
  69         int btemp_high_limit;
  70         int btemp_med_limit;
  71         int btemp_low_limit;
  72 };
  73 
  74 /**
  75  * struct ab8500_btemp - ab8500 BTEMP device information
  76  * @dev:                Pointer to the structure device
  77  * @node:               List of AB8500 BTEMPs, hence prepared for reentrance
  78  * @curr_source:        What current source we use, in uA
  79  * @bat_temp:           Dispatched battery temperature in degree Celsius
  80  * @prev_bat_temp       Last measured battery temperature in degree Celsius
  81  * @parent:             Pointer to the struct ab8500
  82  * @gpadc:              Pointer to the struct gpadc
  83  * @fg:                 Pointer to the struct fg
  84  * @bm:                 Platform specific battery management information
  85  * @btemp_psy:          Structure for BTEMP specific battery properties
  86  * @events:             Structure for information about events triggered
  87  * @btemp_ranges:       Battery temperature range structure
  88  * @btemp_wq:           Work queue for measuring the temperature periodically
  89  * @btemp_periodic_work:        Work for measuring the temperature periodically
  90  * @initialized:        True if battery id read.
  91  */
  92 struct ab8500_btemp {
  93         struct device *dev;
  94         struct list_head node;
  95         int curr_source;
  96         int bat_temp;
  97         int prev_bat_temp;
  98         struct ab8500 *parent;
  99         struct ab8500_gpadc *gpadc;
 100         struct ab8500_fg *fg;
 101         struct abx500_bm_data *bm;
 102         struct power_supply *btemp_psy;
 103         struct ab8500_btemp_events events;
 104         struct ab8500_btemp_ranges btemp_ranges;
 105         struct workqueue_struct *btemp_wq;
 106         struct delayed_work btemp_periodic_work;
 107         bool initialized;
 108 };
 109 
 110 /* BTEMP power supply properties */
 111 static enum power_supply_property ab8500_btemp_props[] = {
 112         POWER_SUPPLY_PROP_PRESENT,
 113         POWER_SUPPLY_PROP_ONLINE,
 114         POWER_SUPPLY_PROP_TECHNOLOGY,
 115         POWER_SUPPLY_PROP_TEMP,
 116 };
 117 
 118 static LIST_HEAD(ab8500_btemp_list);
 119 
 120 /**
 121  * ab8500_btemp_get() - returns a reference to the primary AB8500 BTEMP
 122  * (i.e. the first BTEMP in the instance list)
 123  */
 124 struct ab8500_btemp *ab8500_btemp_get(void)
 125 {
 126         return list_first_entry(&ab8500_btemp_list, struct ab8500_btemp, node);
 127 }
 128 EXPORT_SYMBOL(ab8500_btemp_get);
 129 
 130 /**
 131  * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
 132  * @di:         pointer to the ab8500_btemp structure
 133  * @v_batctrl:  measured batctrl voltage
 134  * @inst_curr:  measured instant current
 135  *
 136  * This function returns the battery resistance that is
 137  * derived from the BATCTRL voltage.
 138  * Returns value in Ohms.
 139  */
 140 static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
 141         int v_batctrl, int inst_curr)
 142 {
 143         int rbs;
 144 
 145         if (is_ab8500_1p1_or_earlier(di->parent)) {
 146                 /*
 147                  * For ABB cut1.0 and 1.1 BAT_CTRL is internally
 148                  * connected to 1.8V through a 450k resistor
 149                  */
 150                 return (450000 * (v_batctrl)) / (1800 - v_batctrl);
 151         }
 152 
 153         if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL) {
 154                 /*
 155                  * If the battery has internal NTC, we use the current
 156                  * source to calculate the resistance.
 157                  */
 158                 rbs = (v_batctrl * 1000
 159                        - di->bm->gnd_lift_resistance * inst_curr)
 160                       / di->curr_source;
 161         } else {
 162                 /*
 163                  * BAT_CTRL is internally
 164                  * connected to 1.8V through a 80k resistor
 165                  */
 166                 rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl);
 167         }
 168 
 169         return rbs;
 170 }
 171 
 172 /**
 173  * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
 174  * @di:         pointer to the ab8500_btemp structure
 175  *
 176  * This function returns the voltage on BATCTRL. Returns value in mV.
 177  */
 178 static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
 179 {
 180         int vbtemp;
 181         static int prev;
 182 
 183         vbtemp = ab8500_gpadc_convert(di->gpadc, BAT_CTRL);
 184         if (vbtemp < 0) {
 185                 dev_err(di->dev,
 186                         "%s gpadc conversion failed, using previous value",
 187                         __func__);
 188                 return prev;
 189         }
 190         prev = vbtemp;
 191         return vbtemp;
 192 }
 193 
 194 /**
 195  * ab8500_btemp_curr_source_enable() - enable/disable batctrl current source
 196  * @di:         pointer to the ab8500_btemp structure
 197  * @enable:     enable or disable the current source
 198  *
 199  * Enable or disable the current sources for the BatCtrl AD channel
 200  */
 201 static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
 202         bool enable)
 203 {
 204         int curr;
 205         int ret = 0;
 206 
 207         /*
 208          * BATCTRL current sources are included on AB8500 cut2.0
 209          * and future versions
 210          */
 211         if (is_ab8500_1p1_or_earlier(di->parent))
 212                 return 0;
 213 
 214         /* Only do this for batteries with internal NTC */
 215         if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) {
 216 
 217                 if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA)
 218                         curr = BAT_CTRL_7U_ENA;
 219                 else
 220                         curr = BAT_CTRL_20U_ENA;
 221 
 222                 dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source);
 223 
 224                 ret = abx500_mask_and_set_register_interruptible(di->dev,
 225                         AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 226                         FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH);
 227                 if (ret) {
 228                         dev_err(di->dev, "%s failed setting cmp_force\n",
 229                                 __func__);
 230                         return ret;
 231                 }
 232 
 233                 /*
 234                  * We have to wait one 32kHz cycle before enabling
 235                  * the current source, since ForceBatCtrlCmpHigh needs
 236                  * to be written in a separate cycle
 237                  */
 238                 udelay(32);
 239 
 240                 ret = abx500_set_register_interruptible(di->dev,
 241                         AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 242                         FORCE_BAT_CTRL_CMP_HIGH | curr);
 243                 if (ret) {
 244                         dev_err(di->dev, "%s failed enabling current source\n",
 245                                 __func__);
 246                         goto disable_curr_source;
 247                 }
 248         } else if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) {
 249                 dev_dbg(di->dev, "Disable BATCTRL curr source\n");
 250 
 251                 /* Write 0 to the curr bits */
 252                 ret = abx500_mask_and_set_register_interruptible(
 253                         di->dev,
 254                         AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 255                         BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
 256                         ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
 257 
 258                 if (ret) {
 259                         dev_err(di->dev, "%s failed disabling current source\n",
 260                                 __func__);
 261                         goto disable_curr_source;
 262                 }
 263 
 264                 /* Enable Pull-Up and comparator */
 265                 ret = abx500_mask_and_set_register_interruptible(di->dev,
 266                         AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 267                         BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
 268                         BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
 269                 if (ret) {
 270                         dev_err(di->dev, "%s failed enabling PU and comp\n",
 271                                 __func__);
 272                         goto enable_pu_comp;
 273                 }
 274 
 275                 /*
 276                  * We have to wait one 32kHz cycle before disabling
 277                  * ForceBatCtrlCmpHigh since this needs to be written
 278                  * in a separate cycle
 279                  */
 280                 udelay(32);
 281 
 282                 /* Disable 'force comparator' */
 283                 ret = abx500_mask_and_set_register_interruptible(di->dev,
 284                         AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 285                         FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
 286                 if (ret) {
 287                         dev_err(di->dev, "%s failed disabling force comp\n",
 288                                 __func__);
 289                         goto disable_force_comp;
 290                 }
 291         }
 292         return ret;
 293 
 294         /*
 295          * We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time
 296          * if we got an error above
 297          */
 298 disable_curr_source:
 299         /* Write 0 to the curr bits */
 300         ret = abx500_mask_and_set_register_interruptible(di->dev,
 301                 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 302                 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
 303                 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
 304 
 305         if (ret) {
 306                 dev_err(di->dev, "%s failed disabling current source\n",
 307                         __func__);
 308                 return ret;
 309         }
 310 enable_pu_comp:
 311         /* Enable Pull-Up and comparator */
 312         ret = abx500_mask_and_set_register_interruptible(di->dev,
 313                 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 314                 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
 315                 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
 316         if (ret) {
 317                 dev_err(di->dev, "%s failed enabling PU and comp\n",
 318                         __func__);
 319                 return ret;
 320         }
 321 
 322 disable_force_comp:
 323         /*
 324          * We have to wait one 32kHz cycle before disabling
 325          * ForceBatCtrlCmpHigh since this needs to be written
 326          * in a separate cycle
 327          */
 328         udelay(32);
 329 
 330         /* Disable 'force comparator' */
 331         ret = abx500_mask_and_set_register_interruptible(di->dev,
 332                 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 333                 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
 334         if (ret) {
 335                 dev_err(di->dev, "%s failed disabling force comp\n",
 336                         __func__);
 337                 return ret;
 338         }
 339 
 340         return ret;
 341 }
 342 
 343 /**
 344  * ab8500_btemp_get_batctrl_res() - get battery resistance
 345  * @di:         pointer to the ab8500_btemp structure
 346  *
 347  * This function returns the battery pack identification resistance.
 348  * Returns value in Ohms.
 349  */
 350 static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
 351 {
 352         int ret;
 353         int batctrl = 0;
 354         int res;
 355         int inst_curr;
 356         int i;
 357 
 358         /*
 359          * BATCTRL current sources are included on AB8500 cut2.0
 360          * and future versions
 361          */
 362         ret = ab8500_btemp_curr_source_enable(di, true);
 363         if (ret) {
 364                 dev_err(di->dev, "%s curr source enabled failed\n", __func__);
 365                 return ret;
 366         }
 367 
 368         if (!di->fg)
 369                 di->fg = ab8500_fg_get();
 370         if (!di->fg) {
 371                 dev_err(di->dev, "No fg found\n");
 372                 return -EINVAL;
 373         }
 374 
 375         ret = ab8500_fg_inst_curr_start(di->fg);
 376 
 377         if (ret) {
 378                 dev_err(di->dev, "Failed to start current measurement\n");
 379                 return ret;
 380         }
 381 
 382         do {
 383                 msleep(20);
 384         } while (!ab8500_fg_inst_curr_started(di->fg));
 385 
 386         i = 0;
 387 
 388         do {
 389                 batctrl += ab8500_btemp_read_batctrl_voltage(di);
 390                 i++;
 391                 msleep(20);
 392         } while (!ab8500_fg_inst_curr_done(di->fg));
 393         batctrl /= i;
 394 
 395         ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
 396         if (ret) {
 397                 dev_err(di->dev, "Failed to finalize current measurement\n");
 398                 return ret;
 399         }
 400 
 401         res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
 402 
 403         ret = ab8500_btemp_curr_source_enable(di, false);
 404         if (ret) {
 405                 dev_err(di->dev, "%s curr source disable failed\n", __func__);
 406                 return ret;
 407         }
 408 
 409         dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
 410                 __func__, batctrl, res, inst_curr, i);
 411 
 412         return res;
 413 }
 414 
 415 /**
 416  * ab8500_btemp_res_to_temp() - resistance to temperature
 417  * @di:         pointer to the ab8500_btemp structure
 418  * @tbl:        pointer to the resiatance to temperature table
 419  * @tbl_size:   size of the resistance to temperature table
 420  * @res:        resistance to calculate the temperature from
 421  *
 422  * This function returns the battery temperature in degrees Celsius
 423  * based on the NTC resistance.
 424  */
 425 static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
 426         const struct abx500_res_to_temp *tbl, int tbl_size, int res)
 427 {
 428         int i;
 429         /*
 430          * Calculate the formula for the straight line
 431          * Simple interpolation if we are within
 432          * the resistance table limits, extrapolate
 433          * if resistance is outside the limits.
 434          */
 435         if (res > tbl[0].resist)
 436                 i = 0;
 437         else if (res <= tbl[tbl_size - 1].resist)
 438                 i = tbl_size - 2;
 439         else {
 440                 i = 0;
 441                 while (!(res <= tbl[i].resist &&
 442                         res > tbl[i + 1].resist))
 443                         i++;
 444         }
 445 
 446         return tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) *
 447                 (res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
 448 }
 449 
 450 /**
 451  * ab8500_btemp_measure_temp() - measure battery temperature
 452  * @di:         pointer to the ab8500_btemp structure
 453  *
 454  * Returns battery temperature (on success) else the previous temperature
 455  */
 456 static int ab8500_btemp_measure_temp(struct ab8500_btemp *di)
 457 {
 458         int temp;
 459         static int prev;
 460         int rbat, rntc, vntc;
 461         u8 id;
 462 
 463         id = di->bm->batt_id;
 464 
 465         if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
 466                         id != BATTERY_UNKNOWN) {
 467 
 468                 rbat = ab8500_btemp_get_batctrl_res(di);
 469                 if (rbat < 0) {
 470                         dev_err(di->dev, "%s get batctrl res failed\n",
 471                                 __func__);
 472                         /*
 473                          * Return out-of-range temperature so that
 474                          * charging is stopped
 475                          */
 476                         return BTEMP_THERMAL_LOW_LIMIT;
 477                 }
 478 
 479                 temp = ab8500_btemp_res_to_temp(di,
 480                         di->bm->bat_type[id].r_to_t_tbl,
 481                         di->bm->bat_type[id].n_temp_tbl_elements, rbat);
 482         } else {
 483                 vntc = ab8500_gpadc_convert(di->gpadc, BTEMP_BALL);
 484                 if (vntc < 0) {
 485                         dev_err(di->dev,
 486                                 "%s gpadc conversion failed,"
 487                                 " using previous value\n", __func__);
 488                         return prev;
 489                 }
 490                 /*
 491                  * The PCB NTC is sourced from VTVOUT via a 230kOhm
 492                  * resistor.
 493                  */
 494                 rntc = 230000 * vntc / (VTVOUT_V - vntc);
 495 
 496                 temp = ab8500_btemp_res_to_temp(di,
 497                         di->bm->bat_type[id].r_to_t_tbl,
 498                         di->bm->bat_type[id].n_temp_tbl_elements, rntc);
 499                 prev = temp;
 500         }
 501         dev_dbg(di->dev, "Battery temperature is %d\n", temp);
 502         return temp;
 503 }
 504 
 505 /**
 506  * ab8500_btemp_id() - Identify the connected battery
 507  * @di:         pointer to the ab8500_btemp structure
 508  *
 509  * This function will try to identify the battery by reading the ID
 510  * resistor. Some brands use a combined ID resistor with a NTC resistor to
 511  * both be able to identify and to read the temperature of it.
 512  */
 513 static int ab8500_btemp_id(struct ab8500_btemp *di)
 514 {
 515         int res;
 516         u8 i;
 517 
 518         di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
 519         di->bm->batt_id = BATTERY_UNKNOWN;
 520 
 521         res =  ab8500_btemp_get_batctrl_res(di);
 522         if (res < 0) {
 523                 dev_err(di->dev, "%s get batctrl res failed\n", __func__);
 524                 return -ENXIO;
 525         }
 526 
 527         /* BATTERY_UNKNOWN is defined on position 0, skip it! */
 528         for (i = BATTERY_UNKNOWN + 1; i < di->bm->n_btypes; i++) {
 529                 if ((res <= di->bm->bat_type[i].resis_high) &&
 530                         (res >= di->bm->bat_type[i].resis_low)) {
 531                         dev_dbg(di->dev, "Battery detected on %s"
 532                                 " low %d < res %d < high: %d"
 533                                 " index: %d\n",
 534                                 di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL ?
 535                                 "BATCTRL" : "BATTEMP",
 536                                 di->bm->bat_type[i].resis_low, res,
 537                                 di->bm->bat_type[i].resis_high, i);
 538 
 539                         di->bm->batt_id = i;
 540                         break;
 541                 }
 542         }
 543 
 544         if (di->bm->batt_id == BATTERY_UNKNOWN) {
 545                 dev_warn(di->dev, "Battery identified as unknown"
 546                         ", resistance %d Ohm\n", res);
 547                 return -ENXIO;
 548         }
 549 
 550         /*
 551          * We only have to change current source if the
 552          * detected type is Type 1.
 553          */
 554         if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
 555             di->bm->batt_id == 1) {
 556                 dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n");
 557                 di->curr_source = BTEMP_BATCTRL_CURR_SRC_20UA;
 558         }
 559 
 560         return di->bm->batt_id;
 561 }
 562 
 563 /**
 564  * ab8500_btemp_periodic_work() - Measuring the temperature periodically
 565  * @work:       pointer to the work_struct structure
 566  *
 567  * Work function for measuring the temperature periodically
 568  */
 569 static void ab8500_btemp_periodic_work(struct work_struct *work)
 570 {
 571         int interval;
 572         int bat_temp;
 573         struct ab8500_btemp *di = container_of(work,
 574                 struct ab8500_btemp, btemp_periodic_work.work);
 575 
 576         if (!di->initialized) {
 577                 /* Identify the battery */
 578                 if (ab8500_btemp_id(di) < 0)
 579                         dev_warn(di->dev, "failed to identify the battery\n");
 580         }
 581 
 582         bat_temp = ab8500_btemp_measure_temp(di);
 583         /*
 584          * Filter battery temperature.
 585          * Allow direct updates on temperature only if two samples result in
 586          * same temperature. Else only allow 1 degree change from previous
 587          * reported value in the direction of the new measurement.
 588          */
 589         if ((bat_temp == di->prev_bat_temp) || !di->initialized) {
 590                 if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) {
 591                         di->initialized = true;
 592                         di->bat_temp = bat_temp;
 593                         power_supply_changed(di->btemp_psy);
 594                 }
 595         } else if (bat_temp < di->prev_bat_temp) {
 596                 di->bat_temp--;
 597                 power_supply_changed(di->btemp_psy);
 598         } else if (bat_temp > di->prev_bat_temp) {
 599                 di->bat_temp++;
 600                 power_supply_changed(di->btemp_psy);
 601         }
 602         di->prev_bat_temp = bat_temp;
 603 
 604         if (di->events.ac_conn || di->events.usb_conn)
 605                 interval = di->bm->temp_interval_chg;
 606         else
 607                 interval = di->bm->temp_interval_nochg;
 608 
 609         /* Schedule a new measurement */
 610         queue_delayed_work(di->btemp_wq,
 611                 &di->btemp_periodic_work,
 612                 round_jiffies(interval * HZ));
 613 }
 614 
 615 /**
 616  * ab8500_btemp_batctrlindb_handler() - battery removal detected
 617  * @irq:       interrupt number
 618  * @_di:       void pointer that has to address of ab8500_btemp
 619  *
 620  * Returns IRQ status(IRQ_HANDLED)
 621  */
 622 static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
 623 {
 624         struct ab8500_btemp *di = _di;
 625         dev_err(di->dev, "Battery removal detected!\n");
 626 
 627         di->events.batt_rem = true;
 628         power_supply_changed(di->btemp_psy);
 629 
 630         return IRQ_HANDLED;
 631 }
 632 
 633 /**
 634  * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
 635  * @irq:       interrupt number
 636  * @_di:       void pointer that has to address of ab8500_btemp
 637  *
 638  * Returns IRQ status(IRQ_HANDLED)
 639  */
 640 static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
 641 {
 642         struct ab8500_btemp *di = _di;
 643 
 644         if (is_ab8500_3p3_or_earlier(di->parent)) {
 645                 dev_dbg(di->dev, "Ignore false btemp low irq"
 646                         " for ABB cut 1.0, 1.1, 2.0 and 3.3\n");
 647         } else {
 648                 dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
 649 
 650                 di->events.btemp_low = true;
 651                 di->events.btemp_high = false;
 652                 di->events.btemp_medhigh = false;
 653                 di->events.btemp_lowmed = false;
 654                 power_supply_changed(di->btemp_psy);
 655         }
 656 
 657         return IRQ_HANDLED;
 658 }
 659 
 660 /**
 661  * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
 662  * @irq:       interrupt number
 663  * @_di:       void pointer that has to address of ab8500_btemp
 664  *
 665  * Returns IRQ status(IRQ_HANDLED)
 666  */
 667 static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
 668 {
 669         struct ab8500_btemp *di = _di;
 670 
 671         dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
 672 
 673         di->events.btemp_high = true;
 674         di->events.btemp_medhigh = false;
 675         di->events.btemp_lowmed = false;
 676         di->events.btemp_low = false;
 677         power_supply_changed(di->btemp_psy);
 678 
 679         return IRQ_HANDLED;
 680 }
 681 
 682 /**
 683  * ab8500_btemp_lowmed_handler() - battery temp between low and medium
 684  * @irq:       interrupt number
 685  * @_di:       void pointer that has to address of ab8500_btemp
 686  *
 687  * Returns IRQ status(IRQ_HANDLED)
 688  */
 689 static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
 690 {
 691         struct ab8500_btemp *di = _di;
 692 
 693         dev_dbg(di->dev, "Battery temperature is between low and medium\n");
 694 
 695         di->events.btemp_lowmed = true;
 696         di->events.btemp_medhigh = false;
 697         di->events.btemp_high = false;
 698         di->events.btemp_low = false;
 699         power_supply_changed(di->btemp_psy);
 700 
 701         return IRQ_HANDLED;
 702 }
 703 
 704 /**
 705  * ab8500_btemp_medhigh_handler() - battery temp between medium and high
 706  * @irq:       interrupt number
 707  * @_di:       void pointer that has to address of ab8500_btemp
 708  *
 709  * Returns IRQ status(IRQ_HANDLED)
 710  */
 711 static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
 712 {
 713         struct ab8500_btemp *di = _di;
 714 
 715         dev_dbg(di->dev, "Battery temperature is between medium and high\n");
 716 
 717         di->events.btemp_medhigh = true;
 718         di->events.btemp_lowmed = false;
 719         di->events.btemp_high = false;
 720         di->events.btemp_low = false;
 721         power_supply_changed(di->btemp_psy);
 722 
 723         return IRQ_HANDLED;
 724 }
 725 
 726 /**
 727  * ab8500_btemp_periodic() - Periodic temperature measurements
 728  * @di:         pointer to the ab8500_btemp structure
 729  * @enable:     enable or disable periodic temperature measurements
 730  *
 731  * Starts of stops periodic temperature measurements. Periodic measurements
 732  * should only be done when a charger is connected.
 733  */
 734 static void ab8500_btemp_periodic(struct ab8500_btemp *di,
 735         bool enable)
 736 {
 737         dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
 738                 enable);
 739         /*
 740          * Make sure a new measurement is done directly by cancelling
 741          * any pending work
 742          */
 743         cancel_delayed_work_sync(&di->btemp_periodic_work);
 744 
 745         if (enable)
 746                 queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
 747 }
 748 
 749 /**
 750  * ab8500_btemp_get_temp() - get battery temperature
 751  * @di:         pointer to the ab8500_btemp structure
 752  *
 753  * Returns battery temperature
 754  */
 755 int ab8500_btemp_get_temp(struct ab8500_btemp *di)
 756 {
 757         int temp = 0;
 758 
 759         /*
 760          * The BTEMP events are not reliabe on AB8500 cut3.3
 761          * and prior versions
 762          */
 763         if (is_ab8500_3p3_or_earlier(di->parent)) {
 764                 temp = di->bat_temp * 10;
 765         } else {
 766                 if (di->events.btemp_low) {
 767                         if (temp > di->btemp_ranges.btemp_low_limit)
 768                                 temp = di->btemp_ranges.btemp_low_limit * 10;
 769                         else
 770                                 temp = di->bat_temp * 10;
 771                 } else if (di->events.btemp_high) {
 772                         if (temp < di->btemp_ranges.btemp_high_limit)
 773                                 temp = di->btemp_ranges.btemp_high_limit * 10;
 774                         else
 775                                 temp = di->bat_temp * 10;
 776                 } else if (di->events.btemp_lowmed) {
 777                         if (temp > di->btemp_ranges.btemp_med_limit)
 778                                 temp = di->btemp_ranges.btemp_med_limit * 10;
 779                         else
 780                                 temp = di->bat_temp * 10;
 781                 } else if (di->events.btemp_medhigh) {
 782                         if (temp < di->btemp_ranges.btemp_med_limit)
 783                                 temp = di->btemp_ranges.btemp_med_limit * 10;
 784                         else
 785                                 temp = di->bat_temp * 10;
 786                 } else
 787                         temp = di->bat_temp * 10;
 788         }
 789         return temp;
 790 }
 791 EXPORT_SYMBOL(ab8500_btemp_get_temp);
 792 
 793 /**
 794  * ab8500_btemp_get_batctrl_temp() - get the temperature
 795  * @btemp:      pointer to the btemp structure
 796  *
 797  * Returns the batctrl temperature in millidegrees
 798  */
 799 int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp *btemp)
 800 {
 801         return btemp->bat_temp * 1000;
 802 }
 803 EXPORT_SYMBOL(ab8500_btemp_get_batctrl_temp);
 804 
 805 /**
 806  * ab8500_btemp_get_property() - get the btemp properties
 807  * @psy:        pointer to the power_supply structure
 808  * @psp:        pointer to the power_supply_property structure
 809  * @val:        pointer to the power_supply_propval union
 810  *
 811  * This function gets called when an application tries to get the btemp
 812  * properties by reading the sysfs files.
 813  * online:      presence of the battery
 814  * present:     presence of the battery
 815  * technology:  battery technology
 816  * temp:        battery temperature
 817  * Returns error code in case of failure else 0(on success)
 818  */
 819 static int ab8500_btemp_get_property(struct power_supply *psy,
 820         enum power_supply_property psp,
 821         union power_supply_propval *val)
 822 {
 823         struct ab8500_btemp *di = power_supply_get_drvdata(psy);
 824 
 825         switch (psp) {
 826         case POWER_SUPPLY_PROP_PRESENT:
 827         case POWER_SUPPLY_PROP_ONLINE:
 828                 if (di->events.batt_rem)
 829                         val->intval = 0;
 830                 else
 831                         val->intval = 1;
 832                 break;
 833         case POWER_SUPPLY_PROP_TECHNOLOGY:
 834                 val->intval = di->bm->bat_type[di->bm->batt_id].name;
 835                 break;
 836         case POWER_SUPPLY_PROP_TEMP:
 837                 val->intval = ab8500_btemp_get_temp(di);
 838                 break;
 839         default:
 840                 return -EINVAL;
 841         }
 842         return 0;
 843 }
 844 
 845 static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
 846 {
 847         struct power_supply *psy;
 848         struct power_supply *ext = dev_get_drvdata(dev);
 849         const char **supplicants = (const char **)ext->supplied_to;
 850         struct ab8500_btemp *di;
 851         union power_supply_propval ret;
 852         int j;
 853 
 854         psy = (struct power_supply *)data;
 855         di = power_supply_get_drvdata(psy);
 856 
 857         /*
 858          * For all psy where the name of your driver
 859          * appears in any supplied_to
 860          */
 861         j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
 862         if (j < 0)
 863                 return 0;
 864 
 865         /* Go through all properties for the psy */
 866         for (j = 0; j < ext->desc->num_properties; j++) {
 867                 enum power_supply_property prop;
 868                 prop = ext->desc->properties[j];
 869 
 870                 if (power_supply_get_property(ext, prop, &ret))
 871                         continue;
 872 
 873                 switch (prop) {
 874                 case POWER_SUPPLY_PROP_PRESENT:
 875                         switch (ext->desc->type) {
 876                         case POWER_SUPPLY_TYPE_MAINS:
 877                                 /* AC disconnected */
 878                                 if (!ret.intval && di->events.ac_conn) {
 879                                         di->events.ac_conn = false;
 880                                 }
 881                                 /* AC connected */
 882                                 else if (ret.intval && !di->events.ac_conn) {
 883                                         di->events.ac_conn = true;
 884                                         if (!di->events.usb_conn)
 885                                                 ab8500_btemp_periodic(di, true);
 886                                 }
 887                                 break;
 888                         case POWER_SUPPLY_TYPE_USB:
 889                                 /* USB disconnected */
 890                                 if (!ret.intval && di->events.usb_conn) {
 891                                         di->events.usb_conn = false;
 892                                 }
 893                                 /* USB connected */
 894                                 else if (ret.intval && !di->events.usb_conn) {
 895                                         di->events.usb_conn = true;
 896                                         if (!di->events.ac_conn)
 897                                                 ab8500_btemp_periodic(di, true);
 898                                 }
 899                                 break;
 900                         default:
 901                                 break;
 902                         }
 903                         break;
 904                 default:
 905                         break;
 906                 }
 907         }
 908         return 0;
 909 }
 910 
 911 /**
 912  * ab8500_btemp_external_power_changed() - callback for power supply changes
 913  * @psy:       pointer to the structure power_supply
 914  *
 915  * This function is pointing to the function pointer external_power_changed
 916  * of the structure power_supply.
 917  * This function gets executed when there is a change in the external power
 918  * supply to the btemp.
 919  */
 920 static void ab8500_btemp_external_power_changed(struct power_supply *psy)
 921 {
 922         struct ab8500_btemp *di = power_supply_get_drvdata(psy);
 923 
 924         class_for_each_device(power_supply_class, NULL,
 925                 di->btemp_psy, ab8500_btemp_get_ext_psy_data);
 926 }
 927 
 928 /* ab8500 btemp driver interrupts and their respective isr */
 929 static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
 930         {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
 931         {"BTEMP_LOW", ab8500_btemp_templow_handler},
 932         {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
 933         {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
 934         {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
 935 };
 936 
 937 #if defined(CONFIG_PM)
 938 static int ab8500_btemp_resume(struct platform_device *pdev)
 939 {
 940         struct ab8500_btemp *di = platform_get_drvdata(pdev);
 941 
 942         ab8500_btemp_periodic(di, true);
 943 
 944         return 0;
 945 }
 946 
 947 static int ab8500_btemp_suspend(struct platform_device *pdev,
 948         pm_message_t state)
 949 {
 950         struct ab8500_btemp *di = platform_get_drvdata(pdev);
 951 
 952         ab8500_btemp_periodic(di, false);
 953 
 954         return 0;
 955 }
 956 #else
 957 #define ab8500_btemp_suspend      NULL
 958 #define ab8500_btemp_resume       NULL
 959 #endif
 960 
 961 static int ab8500_btemp_remove(struct platform_device *pdev)
 962 {
 963         struct ab8500_btemp *di = platform_get_drvdata(pdev);
 964         int i, irq;
 965 
 966         /* Disable interrupts */
 967         for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
 968                 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
 969                 free_irq(irq, di);
 970         }
 971 
 972         /* Delete the work queue */
 973         destroy_workqueue(di->btemp_wq);
 974 
 975         flush_scheduled_work();
 976         power_supply_unregister(di->btemp_psy);
 977 
 978         return 0;
 979 }
 980 
 981 static char *supply_interface[] = {
 982         "ab8500_chargalg",
 983         "ab8500_fg",
 984 };
 985 
 986 static const struct power_supply_desc ab8500_btemp_desc = {
 987         .name                   = "ab8500_btemp",
 988         .type                   = POWER_SUPPLY_TYPE_BATTERY,
 989         .properties             = ab8500_btemp_props,
 990         .num_properties         = ARRAY_SIZE(ab8500_btemp_props),
 991         .get_property           = ab8500_btemp_get_property,
 992         .external_power_changed = ab8500_btemp_external_power_changed,
 993 };
 994 
 995 static int ab8500_btemp_probe(struct platform_device *pdev)
 996 {
 997         struct device_node *np = pdev->dev.of_node;
 998         struct abx500_bm_data *plat = pdev->dev.platform_data;
 999         struct power_supply_config psy_cfg = {};
1000         struct ab8500_btemp *di;
1001         int irq, i, ret = 0;
1002         u8 val;
1003 
1004         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1005         if (!di) {
1006                 dev_err(&pdev->dev, "%s no mem for ab8500_btemp\n", __func__);
1007                 return -ENOMEM;
1008         }
1009 
1010         if (!plat) {
1011                 dev_err(&pdev->dev, "no battery management data supplied\n");
1012                 return -EINVAL;
1013         }
1014         di->bm = plat;
1015 
1016         if (np) {
1017                 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
1018                 if (ret) {
1019                         dev_err(&pdev->dev, "failed to get battery information\n");
1020                         return ret;
1021                 }
1022         }
1023 
1024         /* get parent data */
1025         di->dev = &pdev->dev;
1026         di->parent = dev_get_drvdata(pdev->dev.parent);
1027         di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
1028 
1029         di->initialized = false;
1030 
1031         psy_cfg.supplied_to = supply_interface;
1032         psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
1033         psy_cfg.drv_data = di;
1034 
1035         /* Create a work queue for the btemp */
1036         di->btemp_wq =
1037                 alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM, 0);
1038         if (di->btemp_wq == NULL) {
1039                 dev_err(di->dev, "failed to create work queue\n");
1040                 return -ENOMEM;
1041         }
1042 
1043         /* Init work for measuring temperature periodically */
1044         INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
1045                 ab8500_btemp_periodic_work);
1046 
1047         /* Set BTEMP thermal limits. Low and Med are fixed */
1048         di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
1049         di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
1050 
1051         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1052                 AB8500_BTEMP_HIGH_TH, &val);
1053         if (ret < 0) {
1054                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1055                 goto free_btemp_wq;
1056         }
1057         switch (val) {
1058         case BTEMP_HIGH_TH_57_0:
1059         case BTEMP_HIGH_TH_57_1:
1060                 di->btemp_ranges.btemp_high_limit =
1061                         BTEMP_THERMAL_HIGH_LIMIT_57;
1062                 break;
1063         case BTEMP_HIGH_TH_52:
1064                 di->btemp_ranges.btemp_high_limit =
1065                         BTEMP_THERMAL_HIGH_LIMIT_52;
1066                 break;
1067         case BTEMP_HIGH_TH_62:
1068                 di->btemp_ranges.btemp_high_limit =
1069                         BTEMP_THERMAL_HIGH_LIMIT_62;
1070                 break;
1071         }
1072 
1073         /* Register BTEMP power supply class */
1074         di->btemp_psy = power_supply_register(di->dev, &ab8500_btemp_desc,
1075                                               &psy_cfg);
1076         if (IS_ERR(di->btemp_psy)) {
1077                 dev_err(di->dev, "failed to register BTEMP psy\n");
1078                 ret = PTR_ERR(di->btemp_psy);
1079                 goto free_btemp_wq;
1080         }
1081 
1082         /* Register interrupts */
1083         for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
1084                 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1085                 ret = request_threaded_irq(irq, NULL, ab8500_btemp_irq[i].isr,
1086                         IRQF_SHARED | IRQF_NO_SUSPEND,
1087                         ab8500_btemp_irq[i].name, di);
1088 
1089                 if (ret) {
1090                         dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
1091                                 , ab8500_btemp_irq[i].name, irq, ret);
1092                         goto free_irq;
1093                 }
1094                 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
1095                         ab8500_btemp_irq[i].name, irq, ret);
1096         }
1097 
1098         platform_set_drvdata(pdev, di);
1099 
1100         /* Kick off periodic temperature measurements */
1101         ab8500_btemp_periodic(di, true);
1102         list_add_tail(&di->node, &ab8500_btemp_list);
1103 
1104         return ret;
1105 
1106 free_irq:
1107         power_supply_unregister(di->btemp_psy);
1108 
1109         /* We also have to free all successfully registered irqs */
1110         for (i = i - 1; i >= 0; i--) {
1111                 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1112                 free_irq(irq, di);
1113         }
1114 free_btemp_wq:
1115         destroy_workqueue(di->btemp_wq);
1116         return ret;
1117 }
1118 
1119 static const struct of_device_id ab8500_btemp_match[] = {
1120         { .compatible = "stericsson,ab8500-btemp", },
1121         { },
1122 };
1123 
1124 static struct platform_driver ab8500_btemp_driver = {
1125         .probe = ab8500_btemp_probe,
1126         .remove = ab8500_btemp_remove,
1127         .suspend = ab8500_btemp_suspend,
1128         .resume = ab8500_btemp_resume,
1129         .driver = {
1130                 .name = "ab8500-btemp",
1131                 .of_match_table = ab8500_btemp_match,
1132         },
1133 };
1134 
1135 static int __init ab8500_btemp_init(void)
1136 {
1137         return platform_driver_register(&ab8500_btemp_driver);
1138 }
1139 
1140 static void __exit ab8500_btemp_exit(void)
1141 {
1142         platform_driver_unregister(&ab8500_btemp_driver);
1143 }
1144 
1145 device_initcall(ab8500_btemp_init);
1146 module_exit(ab8500_btemp_exit);
1147 
1148 MODULE_LICENSE("GPL v2");
1149 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
1150 MODULE_ALIAS("platform:ab8500-btemp");
1151 MODULE_DESCRIPTION("AB8500 battery temperature driver");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/power/supply/ab8500_btemp.c

DEFINITIONS
