linux/drivers/power/ab8500_btemp.c
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   1/*
   2 * Copyright (C) ST-Ericsson SA 2012
   3 *
   4 * Battery temperature driver for AB8500
   5 *
   6 * License Terms: GNU General Public License v2
   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#define to_ab8500_btemp_device_info(x) container_of((x), \
  49        struct ab8500_btemp, btemp_psy);
  50
  51/**
  52 * struct ab8500_btemp_interrupts - ab8500 interrupts
  53 * @name:       name of the interrupt
  54 * @isr         function pointer to the isr
  55 */
  56struct ab8500_btemp_interrupts {
  57        char *name;
  58        irqreturn_t (*isr)(int irq, void *data);
  59};
  60
  61struct ab8500_btemp_events {
  62        bool batt_rem;
  63        bool btemp_high;
  64        bool btemp_medhigh;
  65        bool btemp_lowmed;
  66        bool btemp_low;
  67        bool ac_conn;
  68        bool usb_conn;
  69};
  70
  71struct ab8500_btemp_ranges {
  72        int btemp_high_limit;
  73        int btemp_med_limit;
  74        int btemp_low_limit;
  75};
  76
  77/**
  78 * struct ab8500_btemp - ab8500 BTEMP device information
  79 * @dev:                Pointer to the structure device
  80 * @node:               List of AB8500 BTEMPs, hence prepared for reentrance
  81 * @curr_source:        What current source we use, in uA
  82 * @bat_temp:           Dispatched battery temperature in degree Celcius
  83 * @prev_bat_temp       Last measured battery temperature in degree Celcius
  84 * @parent:             Pointer to the struct ab8500
  85 * @gpadc:              Pointer to the struct gpadc
  86 * @fg:                 Pointer to the struct fg
  87 * @bm:                 Platform specific battery management information
  88 * @btemp_psy:          Structure for BTEMP specific battery properties
  89 * @events:             Structure for information about events triggered
  90 * @btemp_ranges:       Battery temperature range structure
  91 * @btemp_wq:           Work queue for measuring the temperature periodically
  92 * @btemp_periodic_work:        Work for measuring the temperature periodically
  93 * @initialized:        True if battery id read.
  94 */
  95struct ab8500_btemp {
  96        struct device *dev;
  97        struct list_head node;
  98        int curr_source;
  99        int bat_temp;
 100        int prev_bat_temp;
 101        struct ab8500 *parent;
 102        struct ab8500_gpadc *gpadc;
 103        struct ab8500_fg *fg;
 104        struct abx500_bm_data *bm;
 105        struct power_supply btemp_psy;
 106        struct ab8500_btemp_events events;
 107        struct ab8500_btemp_ranges btemp_ranges;
 108        struct workqueue_struct *btemp_wq;
 109        struct delayed_work btemp_periodic_work;
 110        bool initialized;
 111};
 112
 113/* BTEMP power supply properties */
 114static enum power_supply_property ab8500_btemp_props[] = {
 115        POWER_SUPPLY_PROP_PRESENT,
 116        POWER_SUPPLY_PROP_ONLINE,
 117        POWER_SUPPLY_PROP_TECHNOLOGY,
 118        POWER_SUPPLY_PROP_TEMP,
 119};
 120
 121static LIST_HEAD(ab8500_btemp_list);
 122
 123/**
 124 * ab8500_btemp_get() - returns a reference to the primary AB8500 BTEMP
 125 * (i.e. the first BTEMP in the instance list)
 126 */
 127struct ab8500_btemp *ab8500_btemp_get(void)
 128{
 129        struct ab8500_btemp *btemp;
 130        btemp = list_first_entry(&ab8500_btemp_list, struct ab8500_btemp, node);
 131
 132        return btemp;
 133}
 134EXPORT_SYMBOL(ab8500_btemp_get);
 135
 136/**
 137 * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
 138 * @di:         pointer to the ab8500_btemp structure
 139 * @v_batctrl:  measured batctrl voltage
 140 * @inst_curr:  measured instant current
 141 *
 142 * This function returns the battery resistance that is
 143 * derived from the BATCTRL voltage.
 144 * Returns value in Ohms.
 145 */
 146static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
 147        int v_batctrl, int inst_curr)
 148{
 149        int rbs;
 150
 151        if (is_ab8500_1p1_or_earlier(di->parent)) {
 152                /*
 153                 * For ABB cut1.0 and 1.1 BAT_CTRL is internally
 154                 * connected to 1.8V through a 450k resistor
 155                 */
 156                return (450000 * (v_batctrl)) / (1800 - v_batctrl);
 157        }
 158
 159        if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL) {
 160                /*
 161                 * If the battery has internal NTC, we use the current
 162                 * source to calculate the resistance.
 163                 */
 164                rbs = (v_batctrl * 1000
 165                       - di->bm->gnd_lift_resistance * inst_curr)
 166                      / di->curr_source;
 167        } else {
 168                /*
 169                 * BAT_CTRL is internally
 170                 * connected to 1.8V through a 80k resistor
 171                 */
 172                rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl);
 173        }
 174
 175        return rbs;
 176}
 177
 178/**
 179 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
 180 * @di:         pointer to the ab8500_btemp structure
 181 *
 182 * This function returns the voltage on BATCTRL. Returns value in mV.
 183 */
 184static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
 185{
 186        int vbtemp;
 187        static int prev;
 188
 189        vbtemp = ab8500_gpadc_convert(di->gpadc, BAT_CTRL);
 190        if (vbtemp < 0) {
 191                dev_err(di->dev,
 192                        "%s gpadc conversion failed, using previous value",
 193                        __func__);
 194                return prev;
 195        }
 196        prev = vbtemp;
 197        return vbtemp;
 198}
 199
 200/**
 201 * ab8500_btemp_curr_source_enable() - enable/disable batctrl current source
 202 * @di:         pointer to the ab8500_btemp structure
 203 * @enable:     enable or disable the current source
 204 *
 205 * Enable or disable the current sources for the BatCtrl AD channel
 206 */
 207static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
 208        bool enable)
 209{
 210        int curr;
 211        int ret = 0;
 212
 213        /*
 214         * BATCTRL current sources are included on AB8500 cut2.0
 215         * and future versions
 216         */
 217        if (is_ab8500_1p1_or_earlier(di->parent))
 218                return 0;
 219
 220        /* Only do this for batteries with internal NTC */
 221        if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) {
 222
 223                if (is_ab8540(di->parent)) {
 224                        if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_60UA)
 225                                curr = BAT_CTRL_60U_ENA;
 226                        else
 227                                curr = BAT_CTRL_120U_ENA;
 228                } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
 229                        if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_16UA)
 230                                curr = BAT_CTRL_16U_ENA;
 231                        else
 232                                curr = BAT_CTRL_18U_ENA;
 233                } else {
 234                        if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA)
 235                                curr = BAT_CTRL_7U_ENA;
 236                        else
 237                                curr = BAT_CTRL_20U_ENA;
 238                }
 239
 240                dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source);
 241
 242                ret = abx500_mask_and_set_register_interruptible(di->dev,
 243                        AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 244                        FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH);
 245                if (ret) {
 246                        dev_err(di->dev, "%s failed setting cmp_force\n",
 247                                __func__);
 248                        return ret;
 249                }
 250
 251                /*
 252                 * We have to wait one 32kHz cycle before enabling
 253                 * the current source, since ForceBatCtrlCmpHigh needs
 254                 * to be written in a separate cycle
 255                 */
 256                udelay(32);
 257
 258                ret = abx500_set_register_interruptible(di->dev,
 259                        AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 260                        FORCE_BAT_CTRL_CMP_HIGH | curr);
 261                if (ret) {
 262                        dev_err(di->dev, "%s failed enabling current source\n",
 263                                __func__);
 264                        goto disable_curr_source;
 265                }
 266        } else if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) {
 267                dev_dbg(di->dev, "Disable BATCTRL curr source\n");
 268
 269                if (is_ab8540(di->parent)) {
 270                        /* Write 0 to the curr bits */
 271                        ret = abx500_mask_and_set_register_interruptible(
 272                                di->dev,
 273                                AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 274                                BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA,
 275                                ~(BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA));
 276                } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
 277                        /* Write 0 to the curr bits */
 278                        ret = abx500_mask_and_set_register_interruptible(
 279                                di->dev,
 280                                AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 281                                BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA,
 282                                ~(BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA));
 283                } else {
 284                        /* Write 0 to the curr bits */
 285                        ret = abx500_mask_and_set_register_interruptible(
 286                                di->dev,
 287                                AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 288                                BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
 289                                ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
 290                }
 291
 292                if (ret) {
 293                        dev_err(di->dev, "%s failed disabling current source\n",
 294                                __func__);
 295                        goto disable_curr_source;
 296                }
 297
 298                /* Enable Pull-Up and comparator */
 299                ret = abx500_mask_and_set_register_interruptible(di->dev,
 300                        AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 301                        BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
 302                        BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
 303                if (ret) {
 304                        dev_err(di->dev, "%s failed enabling PU and comp\n",
 305                                __func__);
 306                        goto enable_pu_comp;
 307                }
 308
 309                /*
 310                 * We have to wait one 32kHz cycle before disabling
 311                 * ForceBatCtrlCmpHigh since this needs to be written
 312                 * in a separate cycle
 313                 */
 314                udelay(32);
 315
 316                /* Disable 'force comparator' */
 317                ret = abx500_mask_and_set_register_interruptible(di->dev,
 318                        AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 319                        FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
 320                if (ret) {
 321                        dev_err(di->dev, "%s failed disabling force comp\n",
 322                                __func__);
 323                        goto disable_force_comp;
 324                }
 325        }
 326        return ret;
 327
 328        /*
 329         * We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time
 330         * if we got an error above
 331         */
 332disable_curr_source:
 333        if (is_ab8540(di->parent)) {
 334                /* Write 0 to the curr bits */
 335                ret = abx500_mask_and_set_register_interruptible(di->dev,
 336                        AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 337                        BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA,
 338                        ~(BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA));
 339        } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
 340                /* Write 0 to the curr bits */
 341                ret = abx500_mask_and_set_register_interruptible(di->dev,
 342                        AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 343                        BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA,
 344                        ~(BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA));
 345        } else {
 346                /* Write 0 to the curr bits */
 347                ret = abx500_mask_and_set_register_interruptible(di->dev,
 348                        AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 349                        BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
 350                        ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
 351        }
 352
 353        if (ret) {
 354                dev_err(di->dev, "%s failed disabling current source\n",
 355                        __func__);
 356                return ret;
 357        }
 358enable_pu_comp:
 359        /* Enable Pull-Up and comparator */
 360        ret = abx500_mask_and_set_register_interruptible(di->dev,
 361                AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 362                BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
 363                BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
 364        if (ret) {
 365                dev_err(di->dev, "%s failed enabling PU and comp\n",
 366                        __func__);
 367                return ret;
 368        }
 369
 370disable_force_comp:
 371        /*
 372         * We have to wait one 32kHz cycle before disabling
 373         * ForceBatCtrlCmpHigh since this needs to be written
 374         * in a separate cycle
 375         */
 376        udelay(32);
 377
 378        /* Disable 'force comparator' */
 379        ret = abx500_mask_and_set_register_interruptible(di->dev,
 380                AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 381                FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
 382        if (ret) {
 383                dev_err(di->dev, "%s failed disabling force comp\n",
 384                        __func__);
 385                return ret;
 386        }
 387
 388        return ret;
 389}
 390
 391/**
 392 * ab8500_btemp_get_batctrl_res() - get battery resistance
 393 * @di:         pointer to the ab8500_btemp structure
 394 *
 395 * This function returns the battery pack identification resistance.
 396 * Returns value in Ohms.
 397 */
 398static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
 399{
 400        int ret;
 401        int batctrl = 0;
 402        int res;
 403        int inst_curr;
 404        int i;
 405
 406        /*
 407         * BATCTRL current sources are included on AB8500 cut2.0
 408         * and future versions
 409         */
 410        ret = ab8500_btemp_curr_source_enable(di, true);
 411        if (ret) {
 412                dev_err(di->dev, "%s curr source enabled failed\n", __func__);
 413                return ret;
 414        }
 415
 416        if (!di->fg)
 417                di->fg = ab8500_fg_get();
 418        if (!di->fg) {
 419                dev_err(di->dev, "No fg found\n");
 420                return -EINVAL;
 421        }
 422
 423        ret = ab8500_fg_inst_curr_start(di->fg);
 424
 425        if (ret) {
 426                dev_err(di->dev, "Failed to start current measurement\n");
 427                return ret;
 428        }
 429
 430        do {
 431                msleep(20);
 432        } while (!ab8500_fg_inst_curr_started(di->fg));
 433
 434        i = 0;
 435
 436        do {
 437                batctrl += ab8500_btemp_read_batctrl_voltage(di);
 438                i++;
 439                msleep(20);
 440        } while (!ab8500_fg_inst_curr_done(di->fg));
 441        batctrl /= i;
 442
 443        ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
 444        if (ret) {
 445                dev_err(di->dev, "Failed to finalize current measurement\n");
 446                return ret;
 447        }
 448
 449        res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
 450
 451        ret = ab8500_btemp_curr_source_enable(di, false);
 452        if (ret) {
 453                dev_err(di->dev, "%s curr source disable failed\n", __func__);
 454                return ret;
 455        }
 456
 457        dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
 458                __func__, batctrl, res, inst_curr, i);
 459
 460        return res;
 461}
 462
 463/**
 464 * ab8500_btemp_res_to_temp() - resistance to temperature
 465 * @di:         pointer to the ab8500_btemp structure
 466 * @tbl:        pointer to the resiatance to temperature table
 467 * @tbl_size:   size of the resistance to temperature table
 468 * @res:        resistance to calculate the temperature from
 469 *
 470 * This function returns the battery temperature in degrees Celcius
 471 * based on the NTC resistance.
 472 */
 473static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
 474        const struct abx500_res_to_temp *tbl, int tbl_size, int res)
 475{
 476        int i, temp;
 477        /*
 478         * Calculate the formula for the straight line
 479         * Simple interpolation if we are within
 480         * the resistance table limits, extrapolate
 481         * if resistance is outside the limits.
 482         */
 483        if (res > tbl[0].resist)
 484                i = 0;
 485        else if (res <= tbl[tbl_size - 1].resist)
 486                i = tbl_size - 2;
 487        else {
 488                i = 0;
 489                while (!(res <= tbl[i].resist &&
 490                        res > tbl[i + 1].resist))
 491                        i++;
 492        }
 493
 494        temp = tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) *
 495                (res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
 496        return temp;
 497}
 498
 499/**
 500 * ab8500_btemp_measure_temp() - measure battery temperature
 501 * @di:         pointer to the ab8500_btemp structure
 502 *
 503 * Returns battery temperature (on success) else the previous temperature
 504 */
 505static int ab8500_btemp_measure_temp(struct ab8500_btemp *di)
 506{
 507        int temp;
 508        static int prev;
 509        int rbat, rntc, vntc;
 510        u8 id;
 511
 512        id = di->bm->batt_id;
 513
 514        if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
 515                        id != BATTERY_UNKNOWN) {
 516
 517                rbat = ab8500_btemp_get_batctrl_res(di);
 518                if (rbat < 0) {
 519                        dev_err(di->dev, "%s get batctrl res failed\n",
 520                                __func__);
 521                        /*
 522                         * Return out-of-range temperature so that
 523                         * charging is stopped
 524                         */
 525                        return BTEMP_THERMAL_LOW_LIMIT;
 526                }
 527
 528                temp = ab8500_btemp_res_to_temp(di,
 529                        di->bm->bat_type[id].r_to_t_tbl,
 530                        di->bm->bat_type[id].n_temp_tbl_elements, rbat);
 531        } else {
 532                vntc = ab8500_gpadc_convert(di->gpadc, BTEMP_BALL);
 533                if (vntc < 0) {
 534                        dev_err(di->dev,
 535                                "%s gpadc conversion failed,"
 536                                " using previous value\n", __func__);
 537                        return prev;
 538                }
 539                /*
 540                 * The PCB NTC is sourced from VTVOUT via a 230kOhm
 541                 * resistor.
 542                 */
 543                rntc = 230000 * vntc / (VTVOUT_V - vntc);
 544
 545                temp = ab8500_btemp_res_to_temp(di,
 546                        di->bm->bat_type[id].r_to_t_tbl,
 547                        di->bm->bat_type[id].n_temp_tbl_elements, rntc);
 548                prev = temp;
 549        }
 550        dev_dbg(di->dev, "Battery temperature is %d\n", temp);
 551        return temp;
 552}
 553
 554/**
 555 * ab8500_btemp_id() - Identify the connected battery
 556 * @di:         pointer to the ab8500_btemp structure
 557 *
 558 * This function will try to identify the battery by reading the ID
 559 * resistor. Some brands use a combined ID resistor with a NTC resistor to
 560 * both be able to identify and to read the temperature of it.
 561 */
 562static int ab8500_btemp_id(struct ab8500_btemp *di)
 563{
 564        int res;
 565        u8 i;
 566        if (is_ab8540(di->parent))
 567                di->curr_source = BTEMP_BATCTRL_CURR_SRC_60UA;
 568        else if (is_ab9540(di->parent) || is_ab8505(di->parent))
 569                di->curr_source = BTEMP_BATCTRL_CURR_SRC_16UA;
 570        else
 571                di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
 572
 573        di->bm->batt_id = BATTERY_UNKNOWN;
 574
 575        res =  ab8500_btemp_get_batctrl_res(di);
 576        if (res < 0) {
 577                dev_err(di->dev, "%s get batctrl res failed\n", __func__);
 578                return -ENXIO;
 579        }
 580
 581        /* BATTERY_UNKNOWN is defined on position 0, skip it! */
 582        for (i = BATTERY_UNKNOWN + 1; i < di->bm->n_btypes; i++) {
 583                if ((res <= di->bm->bat_type[i].resis_high) &&
 584                        (res >= di->bm->bat_type[i].resis_low)) {
 585                        dev_dbg(di->dev, "Battery detected on %s"
 586                                " low %d < res %d < high: %d"
 587                                " index: %d\n",
 588                                di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL ?
 589                                "BATCTRL" : "BATTEMP",
 590                                di->bm->bat_type[i].resis_low, res,
 591                                di->bm->bat_type[i].resis_high, i);
 592
 593                        di->bm->batt_id = i;
 594                        break;
 595                }
 596        }
 597
 598        if (di->bm->batt_id == BATTERY_UNKNOWN) {
 599                dev_warn(di->dev, "Battery identified as unknown"
 600                        ", resistance %d Ohm\n", res);
 601                return -ENXIO;
 602        }
 603
 604        /*
 605         * We only have to change current source if the
 606         * detected type is Type 1.
 607         */
 608        if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
 609            di->bm->batt_id == 1) {
 610                if (is_ab8540(di->parent)) {
 611                        dev_dbg(di->dev,
 612                                "Set BATCTRL current source to 60uA\n");
 613                        di->curr_source = BTEMP_BATCTRL_CURR_SRC_60UA;
 614                } else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
 615                        dev_dbg(di->dev,
 616                                "Set BATCTRL current source to 16uA\n");
 617                        di->curr_source = BTEMP_BATCTRL_CURR_SRC_16UA;
 618                } else {
 619                        dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n");
 620                        di->curr_source = BTEMP_BATCTRL_CURR_SRC_20UA;
 621                }
 622        }
 623
 624        return di->bm->batt_id;
 625}
 626
 627/**
 628 * ab8500_btemp_periodic_work() - Measuring the temperature periodically
 629 * @work:       pointer to the work_struct structure
 630 *
 631 * Work function for measuring the temperature periodically
 632 */
 633static void ab8500_btemp_periodic_work(struct work_struct *work)
 634{
 635        int interval;
 636        int bat_temp;
 637        struct ab8500_btemp *di = container_of(work,
 638                struct ab8500_btemp, btemp_periodic_work.work);
 639
 640        if (!di->initialized) {
 641                /* Identify the battery */
 642                if (ab8500_btemp_id(di) < 0)
 643                        dev_warn(di->dev, "failed to identify the battery\n");
 644        }
 645
 646        bat_temp = ab8500_btemp_measure_temp(di);
 647        /*
 648         * Filter battery temperature.
 649         * Allow direct updates on temperature only if two samples result in
 650         * same temperature. Else only allow 1 degree change from previous
 651         * reported value in the direction of the new measurement.
 652         */
 653        if ((bat_temp == di->prev_bat_temp) || !di->initialized) {
 654                if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) {
 655                        di->initialized = true;
 656                        di->bat_temp = bat_temp;
 657                        power_supply_changed(&di->btemp_psy);
 658                }
 659        } else if (bat_temp < di->prev_bat_temp) {
 660                di->bat_temp--;
 661                power_supply_changed(&di->btemp_psy);
 662        } else if (bat_temp > di->prev_bat_temp) {
 663                di->bat_temp++;
 664                power_supply_changed(&di->btemp_psy);
 665        }
 666        di->prev_bat_temp = bat_temp;
 667
 668        if (di->events.ac_conn || di->events.usb_conn)
 669                interval = di->bm->temp_interval_chg;
 670        else
 671                interval = di->bm->temp_interval_nochg;
 672
 673        /* Schedule a new measurement */
 674        queue_delayed_work(di->btemp_wq,
 675                &di->btemp_periodic_work,
 676                round_jiffies(interval * HZ));
 677}
 678
 679/**
 680 * ab8500_btemp_batctrlindb_handler() - battery removal detected
 681 * @irq:       interrupt number
 682 * @_di:       void pointer that has to address of ab8500_btemp
 683 *
 684 * Returns IRQ status(IRQ_HANDLED)
 685 */
 686static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
 687{
 688        struct ab8500_btemp *di = _di;
 689        dev_err(di->dev, "Battery removal detected!\n");
 690
 691        di->events.batt_rem = true;
 692        power_supply_changed(&di->btemp_psy);
 693
 694        return IRQ_HANDLED;
 695}
 696
 697/**
 698 * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
 699 * @irq:       interrupt number
 700 * @_di:       void pointer that has to address of ab8500_btemp
 701 *
 702 * Returns IRQ status(IRQ_HANDLED)
 703 */
 704static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
 705{
 706        struct ab8500_btemp *di = _di;
 707
 708        if (is_ab8500_3p3_or_earlier(di->parent)) {
 709                dev_dbg(di->dev, "Ignore false btemp low irq"
 710                        " for ABB cut 1.0, 1.1, 2.0 and 3.3\n");
 711        } else {
 712                dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
 713
 714                di->events.btemp_low = true;
 715                di->events.btemp_high = false;
 716                di->events.btemp_medhigh = false;
 717                di->events.btemp_lowmed = false;
 718                power_supply_changed(&di->btemp_psy);
 719        }
 720
 721        return IRQ_HANDLED;
 722}
 723
 724/**
 725 * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
 726 * @irq:       interrupt number
 727 * @_di:       void pointer that has to address of ab8500_btemp
 728 *
 729 * Returns IRQ status(IRQ_HANDLED)
 730 */
 731static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
 732{
 733        struct ab8500_btemp *di = _di;
 734
 735        dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
 736
 737        di->events.btemp_high = true;
 738        di->events.btemp_medhigh = false;
 739        di->events.btemp_lowmed = false;
 740        di->events.btemp_low = false;
 741        power_supply_changed(&di->btemp_psy);
 742
 743        return IRQ_HANDLED;
 744}
 745
 746/**
 747 * ab8500_btemp_lowmed_handler() - battery temp between low and medium
 748 * @irq:       interrupt number
 749 * @_di:       void pointer that has to address of ab8500_btemp
 750 *
 751 * Returns IRQ status(IRQ_HANDLED)
 752 */
 753static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
 754{
 755        struct ab8500_btemp *di = _di;
 756
 757        dev_dbg(di->dev, "Battery temperature is between low and medium\n");
 758
 759        di->events.btemp_lowmed = true;
 760        di->events.btemp_medhigh = false;
 761        di->events.btemp_high = false;
 762        di->events.btemp_low = false;
 763        power_supply_changed(&di->btemp_psy);
 764
 765        return IRQ_HANDLED;
 766}
 767
 768/**
 769 * ab8500_btemp_medhigh_handler() - battery temp between medium and high
 770 * @irq:       interrupt number
 771 * @_di:       void pointer that has to address of ab8500_btemp
 772 *
 773 * Returns IRQ status(IRQ_HANDLED)
 774 */
 775static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
 776{
 777        struct ab8500_btemp *di = _di;
 778
 779        dev_dbg(di->dev, "Battery temperature is between medium and high\n");
 780
 781        di->events.btemp_medhigh = true;
 782        di->events.btemp_lowmed = false;
 783        di->events.btemp_high = false;
 784        di->events.btemp_low = false;
 785        power_supply_changed(&di->btemp_psy);
 786
 787        return IRQ_HANDLED;
 788}
 789
 790/**
 791 * ab8500_btemp_periodic() - Periodic temperature measurements
 792 * @di:         pointer to the ab8500_btemp structure
 793 * @enable:     enable or disable periodic temperature measurements
 794 *
 795 * Starts of stops periodic temperature measurements. Periodic measurements
 796 * should only be done when a charger is connected.
 797 */
 798static void ab8500_btemp_periodic(struct ab8500_btemp *di,
 799        bool enable)
 800{
 801        dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
 802                enable);
 803        /*
 804         * Make sure a new measurement is done directly by cancelling
 805         * any pending work
 806         */
 807        cancel_delayed_work_sync(&di->btemp_periodic_work);
 808
 809        if (enable)
 810                queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
 811}
 812
 813/**
 814 * ab8500_btemp_get_temp() - get battery temperature
 815 * @di:         pointer to the ab8500_btemp structure
 816 *
 817 * Returns battery temperature
 818 */
 819int ab8500_btemp_get_temp(struct ab8500_btemp *di)
 820{
 821        int temp = 0;
 822
 823        /*
 824         * The BTEMP events are not reliabe on AB8500 cut3.3
 825         * and prior versions
 826         */
 827        if (is_ab8500_3p3_or_earlier(di->parent)) {
 828                temp = di->bat_temp * 10;
 829        } else {
 830                if (di->events.btemp_low) {
 831                        if (temp > di->btemp_ranges.btemp_low_limit)
 832                                temp = di->btemp_ranges.btemp_low_limit * 10;
 833                        else
 834                                temp = di->bat_temp * 10;
 835                } else if (di->events.btemp_high) {
 836                        if (temp < di->btemp_ranges.btemp_high_limit)
 837                                temp = di->btemp_ranges.btemp_high_limit * 10;
 838                        else
 839                                temp = di->bat_temp * 10;
 840                } else if (di->events.btemp_lowmed) {
 841                        if (temp > di->btemp_ranges.btemp_med_limit)
 842                                temp = di->btemp_ranges.btemp_med_limit * 10;
 843                        else
 844                                temp = di->bat_temp * 10;
 845                } else if (di->events.btemp_medhigh) {
 846                        if (temp < di->btemp_ranges.btemp_med_limit)
 847                                temp = di->btemp_ranges.btemp_med_limit * 10;
 848                        else
 849                                temp = di->bat_temp * 10;
 850                } else
 851                        temp = di->bat_temp * 10;
 852        }
 853        return temp;
 854}
 855EXPORT_SYMBOL(ab8500_btemp_get_temp);
 856
 857/**
 858 * ab8500_btemp_get_batctrl_temp() - get the temperature
 859 * @btemp:      pointer to the btemp structure
 860 *
 861 * Returns the batctrl temperature in millidegrees
 862 */
 863int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp *btemp)
 864{
 865        return btemp->bat_temp * 1000;
 866}
 867EXPORT_SYMBOL(ab8500_btemp_get_batctrl_temp);
 868
 869/**
 870 * ab8500_btemp_get_property() - get the btemp properties
 871 * @psy:        pointer to the power_supply structure
 872 * @psp:        pointer to the power_supply_property structure
 873 * @val:        pointer to the power_supply_propval union
 874 *
 875 * This function gets called when an application tries to get the btemp
 876 * properties by reading the sysfs files.
 877 * online:      presence of the battery
 878 * present:     presence of the battery
 879 * technology:  battery technology
 880 * temp:        battery temperature
 881 * Returns error code in case of failure else 0(on success)
 882 */
 883static int ab8500_btemp_get_property(struct power_supply *psy,
 884        enum power_supply_property psp,
 885        union power_supply_propval *val)
 886{
 887        struct ab8500_btemp *di;
 888
 889        di = to_ab8500_btemp_device_info(psy);
 890
 891        switch (psp) {
 892        case POWER_SUPPLY_PROP_PRESENT:
 893        case POWER_SUPPLY_PROP_ONLINE:
 894                if (di->events.batt_rem)
 895                        val->intval = 0;
 896                else
 897                        val->intval = 1;
 898                break;
 899        case POWER_SUPPLY_PROP_TECHNOLOGY:
 900                val->intval = di->bm->bat_type[di->bm->batt_id].name;
 901                break;
 902        case POWER_SUPPLY_PROP_TEMP:
 903                val->intval = ab8500_btemp_get_temp(di);
 904                break;
 905        default:
 906                return -EINVAL;
 907        }
 908        return 0;
 909}
 910
 911static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
 912{
 913        struct power_supply *psy;
 914        struct power_supply *ext;
 915        struct ab8500_btemp *di;
 916        union power_supply_propval ret;
 917        int i, j;
 918        bool psy_found = false;
 919
 920        psy = (struct power_supply *)data;
 921        ext = dev_get_drvdata(dev);
 922        di = to_ab8500_btemp_device_info(psy);
 923
 924        /*
 925         * For all psy where the name of your driver
 926         * appears in any supplied_to
 927         */
 928        for (i = 0; i < ext->num_supplicants; i++) {
 929                if (!strcmp(ext->supplied_to[i], psy->name))
 930                        psy_found = true;
 931        }
 932
 933        if (!psy_found)
 934                return 0;
 935
 936        /* Go through all properties for the psy */
 937        for (j = 0; j < ext->num_properties; j++) {
 938                enum power_supply_property prop;
 939                prop = ext->properties[j];
 940
 941                if (ext->get_property(ext, prop, &ret))
 942                        continue;
 943
 944                switch (prop) {
 945                case POWER_SUPPLY_PROP_PRESENT:
 946                        switch (ext->type) {
 947                        case POWER_SUPPLY_TYPE_MAINS:
 948                                /* AC disconnected */
 949                                if (!ret.intval && di->events.ac_conn) {
 950                                        di->events.ac_conn = false;
 951                                }
 952                                /* AC connected */
 953                                else if (ret.intval && !di->events.ac_conn) {
 954                                        di->events.ac_conn = true;
 955                                        if (!di->events.usb_conn)
 956                                                ab8500_btemp_periodic(di, true);
 957                                }
 958                                break;
 959                        case POWER_SUPPLY_TYPE_USB:
 960                                /* USB disconnected */
 961                                if (!ret.intval && di->events.usb_conn) {
 962                                        di->events.usb_conn = false;
 963                                }
 964                                /* USB connected */
 965                                else if (ret.intval && !di->events.usb_conn) {
 966                                        di->events.usb_conn = true;
 967                                        if (!di->events.ac_conn)
 968                                                ab8500_btemp_periodic(di, true);
 969                                }
 970                                break;
 971                        default:
 972                                break;
 973                        }
 974                        break;
 975                default:
 976                        break;
 977                }
 978        }
 979        return 0;
 980}
 981
 982/**
 983 * ab8500_btemp_external_power_changed() - callback for power supply changes
 984 * @psy:       pointer to the structure power_supply
 985 *
 986 * This function is pointing to the function pointer external_power_changed
 987 * of the structure power_supply.
 988 * This function gets executed when there is a change in the external power
 989 * supply to the btemp.
 990 */
 991static void ab8500_btemp_external_power_changed(struct power_supply *psy)
 992{
 993        struct ab8500_btemp *di = to_ab8500_btemp_device_info(psy);
 994
 995        class_for_each_device(power_supply_class, NULL,
 996                &di->btemp_psy, ab8500_btemp_get_ext_psy_data);
 997}
 998
 999/* ab8500 btemp driver interrupts and their respective isr */
1000static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
1001        {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
1002        {"BTEMP_LOW", ab8500_btemp_templow_handler},
1003        {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
1004        {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
1005        {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
1006};
1007
1008#if defined(CONFIG_PM)
1009static int ab8500_btemp_resume(struct platform_device *pdev)
1010{
1011        struct ab8500_btemp *di = platform_get_drvdata(pdev);
1012
1013        ab8500_btemp_periodic(di, true);
1014
1015        return 0;
1016}
1017
1018static int ab8500_btemp_suspend(struct platform_device *pdev,
1019        pm_message_t state)
1020{
1021        struct ab8500_btemp *di = platform_get_drvdata(pdev);
1022
1023        ab8500_btemp_periodic(di, false);
1024
1025        return 0;
1026}
1027#else
1028#define ab8500_btemp_suspend      NULL
1029#define ab8500_btemp_resume       NULL
1030#endif
1031
1032static int ab8500_btemp_remove(struct platform_device *pdev)
1033{
1034        struct ab8500_btemp *di = platform_get_drvdata(pdev);
1035        int i, irq;
1036
1037        /* Disable interrupts */
1038        for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
1039                irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1040                free_irq(irq, di);
1041        }
1042
1043        /* Delete the work queue */
1044        destroy_workqueue(di->btemp_wq);
1045
1046        flush_scheduled_work();
1047        power_supply_unregister(&di->btemp_psy);
1048
1049        return 0;
1050}
1051
1052static char *supply_interface[] = {
1053        "ab8500_chargalg",
1054        "ab8500_fg",
1055};
1056
1057static int ab8500_btemp_probe(struct platform_device *pdev)
1058{
1059        struct device_node *np = pdev->dev.of_node;
1060        struct abx500_bm_data *plat = pdev->dev.platform_data;
1061        struct ab8500_btemp *di;
1062        int irq, i, ret = 0;
1063        u8 val;
1064
1065        di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1066        if (!di) {
1067                dev_err(&pdev->dev, "%s no mem for ab8500_btemp\n", __func__);
1068                return -ENOMEM;
1069        }
1070
1071        if (!plat) {
1072                dev_err(&pdev->dev, "no battery management data supplied\n");
1073                return -EINVAL;
1074        }
1075        di->bm = plat;
1076
1077        if (np) {
1078                ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
1079                if (ret) {
1080                        dev_err(&pdev->dev, "failed to get battery information\n");
1081                        return ret;
1082                }
1083        }
1084
1085        /* get parent data */
1086        di->dev = &pdev->dev;
1087        di->parent = dev_get_drvdata(pdev->dev.parent);
1088        di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
1089
1090        di->initialized = false;
1091
1092        /* BTEMP supply */
1093        di->btemp_psy.name = "ab8500_btemp";
1094        di->btemp_psy.type = POWER_SUPPLY_TYPE_BATTERY;
1095        di->btemp_psy.properties = ab8500_btemp_props;
1096        di->btemp_psy.num_properties = ARRAY_SIZE(ab8500_btemp_props);
1097        di->btemp_psy.get_property = ab8500_btemp_get_property;
1098        di->btemp_psy.supplied_to = supply_interface;
1099        di->btemp_psy.num_supplicants = ARRAY_SIZE(supply_interface);
1100        di->btemp_psy.external_power_changed =
1101                ab8500_btemp_external_power_changed;
1102
1103
1104        /* Create a work queue for the btemp */
1105        di->btemp_wq =
1106                create_singlethread_workqueue("ab8500_btemp_wq");
1107        if (di->btemp_wq == NULL) {
1108                dev_err(di->dev, "failed to create work queue\n");
1109                return -ENOMEM;
1110        }
1111
1112        /* Init work for measuring temperature periodically */
1113        INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
1114                ab8500_btemp_periodic_work);
1115
1116        /* Set BTEMP thermal limits. Low and Med are fixed */
1117        di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
1118        di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
1119
1120        ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1121                AB8500_BTEMP_HIGH_TH, &val);
1122        if (ret < 0) {
1123                dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1124                goto free_btemp_wq;
1125        }
1126        switch (val) {
1127        case BTEMP_HIGH_TH_57_0:
1128        case BTEMP_HIGH_TH_57_1:
1129                di->btemp_ranges.btemp_high_limit =
1130                        BTEMP_THERMAL_HIGH_LIMIT_57;
1131                break;
1132        case BTEMP_HIGH_TH_52:
1133                di->btemp_ranges.btemp_high_limit =
1134                        BTEMP_THERMAL_HIGH_LIMIT_52;
1135                break;
1136        case BTEMP_HIGH_TH_62:
1137                di->btemp_ranges.btemp_high_limit =
1138                        BTEMP_THERMAL_HIGH_LIMIT_62;
1139                break;
1140        }
1141
1142        /* Register BTEMP power supply class */
1143        ret = power_supply_register(di->dev, &di->btemp_psy);
1144        if (ret) {
1145                dev_err(di->dev, "failed to register BTEMP psy\n");
1146                goto free_btemp_wq;
1147        }
1148
1149        /* Register interrupts */
1150        for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
1151                irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1152                ret = request_threaded_irq(irq, NULL, ab8500_btemp_irq[i].isr,
1153                        IRQF_SHARED | IRQF_NO_SUSPEND,
1154                        ab8500_btemp_irq[i].name, di);
1155
1156                if (ret) {
1157                        dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
1158                                , ab8500_btemp_irq[i].name, irq, ret);
1159                        goto free_irq;
1160                }
1161                dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
1162                        ab8500_btemp_irq[i].name, irq, ret);
1163        }
1164
1165        platform_set_drvdata(pdev, di);
1166
1167        /* Kick off periodic temperature measurements */
1168        ab8500_btemp_periodic(di, true);
1169        list_add_tail(&di->node, &ab8500_btemp_list);
1170
1171        return ret;
1172
1173free_irq:
1174        power_supply_unregister(&di->btemp_psy);
1175
1176        /* We also have to free all successfully registered irqs */
1177        for (i = i - 1; i >= 0; i--) {
1178                irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1179                free_irq(irq, di);
1180        }
1181free_btemp_wq:
1182        destroy_workqueue(di->btemp_wq);
1183        return ret;
1184}
1185
1186static const struct of_device_id ab8500_btemp_match[] = {
1187        { .compatible = "stericsson,ab8500-btemp", },
1188        { },
1189};
1190
1191static struct platform_driver ab8500_btemp_driver = {
1192        .probe = ab8500_btemp_probe,
1193        .remove = ab8500_btemp_remove,
1194        .suspend = ab8500_btemp_suspend,
1195        .resume = ab8500_btemp_resume,
1196        .driver = {
1197                .name = "ab8500-btemp",
1198                .owner = THIS_MODULE,
1199                .of_match_table = ab8500_btemp_match,
1200        },
1201};
1202
1203static int __init ab8500_btemp_init(void)
1204{
1205        return platform_driver_register(&ab8500_btemp_driver);
1206}
1207
1208static void __exit ab8500_btemp_exit(void)
1209{
1210        platform_driver_unregister(&ab8500_btemp_driver);
1211}
1212
1213device_initcall(ab8500_btemp_init);
1214module_exit(ab8500_btemp_exit);
1215
1216MODULE_LICENSE("GPL v2");
1217MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
1218MODULE_ALIAS("platform:ab8500-btemp");
1219MODULE_DESCRIPTION("AB8500 battery temperature driver");
1220
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