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 to_ab8500_btemp_device_info(x) container_of((x), \
  43        struct ab8500_btemp, btemp_psy);
  44
  45/**
  46 * struct ab8500_btemp_interrupts - ab8500 interrupts
  47 * @name:       name of the interrupt
  48 * @isr         function pointer to the isr
  49 */
  50struct ab8500_btemp_interrupts {
  51        char *name;
  52        irqreturn_t (*isr)(int irq, void *data);
  53};
  54
  55struct ab8500_btemp_events {
  56        bool batt_rem;
  57        bool btemp_high;
  58        bool btemp_medhigh;
  59        bool btemp_lowmed;
  60        bool btemp_low;
  61        bool ac_conn;
  62        bool usb_conn;
  63};
  64
  65struct ab8500_btemp_ranges {
  66        int btemp_high_limit;
  67        int btemp_med_limit;
  68        int btemp_low_limit;
  69};
  70
  71/**
  72 * struct ab8500_btemp - ab8500 BTEMP device information
  73 * @dev:                Pointer to the structure device
  74 * @node:               List of AB8500 BTEMPs, hence prepared for reentrance
  75 * @curr_source:        What current source we use, in uA
  76 * @bat_temp:           Battery temperature in degree Celcius
  77 * @prev_bat_temp       Last dispatched battery temperature
  78 * @parent:             Pointer to the struct ab8500
  79 * @gpadc:              Pointer to the struct gpadc
  80 * @fg:                 Pointer to the struct fg
  81 * @bat:                Pointer to the abx500_bm platform data
  82 * @btemp_psy:          Structure for BTEMP specific battery properties
  83 * @events:             Structure for information about events triggered
  84 * @btemp_ranges:       Battery temperature range structure
  85 * @btemp_wq:           Work queue for measuring the temperature periodically
  86 * @btemp_periodic_work:        Work for measuring the temperature periodically
  87 */
  88struct ab8500_btemp {
  89        struct device *dev;
  90        struct list_head node;
  91        int curr_source;
  92        int bat_temp;
  93        int prev_bat_temp;
  94        struct ab8500 *parent;
  95        struct ab8500_gpadc *gpadc;
  96        struct ab8500_fg *fg;
  97        struct abx500_bm_data *bat;
  98        struct power_supply btemp_psy;
  99        struct ab8500_btemp_events events;
 100        struct ab8500_btemp_ranges btemp_ranges;
 101        struct workqueue_struct *btemp_wq;
 102        struct delayed_work btemp_periodic_work;
 103};
 104
 105/* BTEMP power supply properties */
 106static enum power_supply_property ab8500_btemp_props[] = {
 107        POWER_SUPPLY_PROP_PRESENT,
 108        POWER_SUPPLY_PROP_ONLINE,
 109        POWER_SUPPLY_PROP_TECHNOLOGY,
 110        POWER_SUPPLY_PROP_TEMP,
 111};
 112
 113static LIST_HEAD(ab8500_btemp_list);
 114
 115/**
 116 * ab8500_btemp_get() - returns a reference to the primary AB8500 BTEMP
 117 * (i.e. the first BTEMP in the instance list)
 118 */
 119struct ab8500_btemp *ab8500_btemp_get(void)
 120{
 121        struct ab8500_btemp *btemp;
 122        btemp = list_first_entry(&ab8500_btemp_list, struct ab8500_btemp, node);
 123
 124        return btemp;
 125}
 126
 127/**
 128 * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
 129 * @di:         pointer to the ab8500_btemp structure
 130 * @v_batctrl:  measured batctrl voltage
 131 * @inst_curr:  measured instant current
 132 *
 133 * This function returns the battery resistance that is
 134 * derived from the BATCTRL voltage.
 135 * Returns value in Ohms.
 136 */
 137static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
 138        int v_batctrl, int inst_curr)
 139{
 140        int rbs;
 141
 142        if (is_ab8500_1p1_or_earlier(di->parent)) {
 143                /*
 144                 * For ABB cut1.0 and 1.1 BAT_CTRL is internally
 145                 * connected to 1.8V through a 450k resistor
 146                 */
 147                return (450000 * (v_batctrl)) / (1800 - v_batctrl);
 148        }
 149
 150        if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL) {
 151                /*
 152                 * If the battery has internal NTC, we use the current
 153                 * source to calculate the resistance, 7uA or 20uA
 154                 */
 155                rbs = (v_batctrl * 1000
 156                       - di->bat->gnd_lift_resistance * inst_curr)
 157                      / di->curr_source;
 158        } else {
 159                /*
 160                 * BAT_CTRL is internally
 161                 * connected to 1.8V through a 80k resistor
 162                 */
 163                rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl);
 164        }
 165
 166        return rbs;
 167}
 168
 169/**
 170 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
 171 * @di:         pointer to the ab8500_btemp structure
 172 *
 173 * This function returns the voltage on BATCTRL. Returns value in mV.
 174 */
 175static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
 176{
 177        int vbtemp;
 178        static int prev;
 179
 180        vbtemp = ab8500_gpadc_convert(di->gpadc, BAT_CTRL);
 181        if (vbtemp < 0) {
 182                dev_err(di->dev,
 183                        "%s gpadc conversion failed, using previous value",
 184                        __func__);
 185                return prev;
 186        }
 187        prev = vbtemp;
 188        return vbtemp;
 189}
 190
 191/**
 192 * ab8500_btemp_curr_source_enable() - enable/disable batctrl current source
 193 * @di:         pointer to the ab8500_btemp structure
 194 * @enable:     enable or disable the current source
 195 *
 196 * Enable or disable the current sources for the BatCtrl AD channel
 197 */
 198static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
 199        bool enable)
 200{
 201        int curr;
 202        int ret = 0;
 203
 204        /*
 205         * BATCTRL current sources are included on AB8500 cut2.0
 206         * and future versions
 207         */
 208        if (is_ab8500_1p1_or_earlier(di->parent))
 209                return 0;
 210
 211        /* Only do this for batteries with internal NTC */
 212        if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) {
 213                if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA)
 214                        curr = BAT_CTRL_7U_ENA;
 215                else
 216                        curr = BAT_CTRL_20U_ENA;
 217
 218                dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source);
 219
 220                ret = abx500_mask_and_set_register_interruptible(di->dev,
 221                        AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 222                        FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH);
 223                if (ret) {
 224                        dev_err(di->dev, "%s failed setting cmp_force\n",
 225                                __func__);
 226                        return ret;
 227                }
 228
 229                /*
 230                 * We have to wait one 32kHz cycle before enabling
 231                 * the current source, since ForceBatCtrlCmpHigh needs
 232                 * to be written in a separate cycle
 233                 */
 234                udelay(32);
 235
 236                ret = abx500_set_register_interruptible(di->dev,
 237                        AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 238                        FORCE_BAT_CTRL_CMP_HIGH | curr);
 239                if (ret) {
 240                        dev_err(di->dev, "%s failed enabling current source\n",
 241                                __func__);
 242                        goto disable_curr_source;
 243                }
 244        } else if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) {
 245                dev_dbg(di->dev, "Disable BATCTRL curr source\n");
 246
 247                /* Write 0 to the curr bits */
 248                ret = abx500_mask_and_set_register_interruptible(di->dev,
 249                        AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 250                        BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
 251                        ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
 252                if (ret) {
 253                        dev_err(di->dev, "%s failed disabling current source\n",
 254                                __func__);
 255                        goto disable_curr_source;
 256                }
 257
 258                /* Enable Pull-Up and comparator */
 259                ret = abx500_mask_and_set_register_interruptible(di->dev,
 260                        AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 261                        BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
 262                        BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
 263                if (ret) {
 264                        dev_err(di->dev, "%s failed enabling PU and comp\n",
 265                                __func__);
 266                        goto enable_pu_comp;
 267                }
 268
 269                /*
 270                 * We have to wait one 32kHz cycle before disabling
 271                 * ForceBatCtrlCmpHigh since this needs to be written
 272                 * in a separate cycle
 273                 */
 274                udelay(32);
 275
 276                /* Disable 'force comparator' */
 277                ret = abx500_mask_and_set_register_interruptible(di->dev,
 278                        AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 279                        FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
 280                if (ret) {
 281                        dev_err(di->dev, "%s failed disabling force comp\n",
 282                                __func__);
 283                        goto disable_force_comp;
 284                }
 285        }
 286        return ret;
 287
 288        /*
 289         * We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time
 290         * if we got an error above
 291         */
 292disable_curr_source:
 293        /* Write 0 to the curr bits */
 294        ret = abx500_mask_and_set_register_interruptible(di->dev,
 295                        AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 296                        BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
 297                        ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
 298        if (ret) {
 299                dev_err(di->dev, "%s failed disabling current source\n",
 300                        __func__);
 301                return ret;
 302        }
 303enable_pu_comp:
 304        /* Enable Pull-Up and comparator */
 305        ret = abx500_mask_and_set_register_interruptible(di->dev,
 306                AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 307                BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
 308                BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
 309        if (ret) {
 310                dev_err(di->dev, "%s failed enabling PU and comp\n",
 311                        __func__);
 312                return ret;
 313        }
 314
 315disable_force_comp:
 316        /*
 317         * We have to wait one 32kHz cycle before disabling
 318         * ForceBatCtrlCmpHigh since this needs to be written
 319         * in a separate cycle
 320         */
 321        udelay(32);
 322
 323        /* Disable 'force comparator' */
 324        ret = abx500_mask_and_set_register_interruptible(di->dev,
 325                AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
 326                FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
 327        if (ret) {
 328                dev_err(di->dev, "%s failed disabling force comp\n",
 329                        __func__);
 330                return ret;
 331        }
 332
 333        return ret;
 334}
 335
 336/**
 337 * ab8500_btemp_get_batctrl_res() - get battery resistance
 338 * @di:         pointer to the ab8500_btemp structure
 339 *
 340 * This function returns the battery pack identification resistance.
 341 * Returns value in Ohms.
 342 */
 343static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
 344{
 345        int ret;
 346        int batctrl = 0;
 347        int res;
 348        int inst_curr;
 349        int i;
 350
 351        /*
 352         * BATCTRL current sources are included on AB8500 cut2.0
 353         * and future versions
 354         */
 355        ret = ab8500_btemp_curr_source_enable(di, true);
 356        if (ret) {
 357                dev_err(di->dev, "%s curr source enabled failed\n", __func__);
 358                return ret;
 359        }
 360
 361        if (!di->fg)
 362                di->fg = ab8500_fg_get();
 363        if (!di->fg) {
 364                dev_err(di->dev, "No fg found\n");
 365                return -EINVAL;
 366        }
 367
 368        ret = ab8500_fg_inst_curr_start(di->fg);
 369
 370        if (ret) {
 371                dev_err(di->dev, "Failed to start current measurement\n");
 372                return ret;
 373        }
 374
 375        /*
 376         * Since there is no interrupt when current measurement is done,
 377         * loop for over 250ms (250ms is one sample conversion time
 378         * with 32.768 Khz RTC clock). Note that a stop time must be set
 379         * since the ab8500_btemp_read_batctrl_voltage call can block and
 380         * take an unknown amount of time to complete.
 381         */
 382        i = 0;
 383
 384        do {
 385                batctrl += ab8500_btemp_read_batctrl_voltage(di);
 386                i++;
 387                msleep(20);
 388        } while (!ab8500_fg_inst_curr_done(di->fg));
 389        batctrl /= i;
 390
 391        ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
 392        if (ret) {
 393                dev_err(di->dev, "Failed to finalize current measurement\n");
 394                return ret;
 395        }
 396
 397        res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
 398
 399        ret = ab8500_btemp_curr_source_enable(di, false);
 400        if (ret) {
 401                dev_err(di->dev, "%s curr source disable failed\n", __func__);
 402                return ret;
 403        }
 404
 405        dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
 406                __func__, batctrl, res, inst_curr, i);
 407
 408        return res;
 409}
 410
 411/**
 412 * ab8500_btemp_res_to_temp() - resistance to temperature
 413 * @di:         pointer to the ab8500_btemp structure
 414 * @tbl:        pointer to the resiatance to temperature table
 415 * @tbl_size:   size of the resistance to temperature table
 416 * @res:        resistance to calculate the temperature from
 417 *
 418 * This function returns the battery temperature in degrees Celcius
 419 * based on the NTC resistance.
 420 */
 421static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
 422        const struct abx500_res_to_temp *tbl, int tbl_size, int res)
 423{
 424        int i, temp;
 425        /*
 426         * Calculate the formula for the straight line
 427         * Simple interpolation if we are within
 428         * the resistance table limits, extrapolate
 429         * if resistance is outside the limits.
 430         */
 431        if (res > tbl[0].resist)
 432                i = 0;
 433        else if (res <= tbl[tbl_size - 1].resist)
 434                i = tbl_size - 2;
 435        else {
 436                i = 0;
 437                while (!(res <= tbl[i].resist &&
 438                        res > tbl[i + 1].resist))
 439                        i++;
 440        }
 441
 442        temp = tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) *
 443                (res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
 444        return temp;
 445}
 446
 447/**
 448 * ab8500_btemp_measure_temp() - measure battery temperature
 449 * @di:         pointer to the ab8500_btemp structure
 450 *
 451 * Returns battery temperature (on success) else the previous temperature
 452 */
 453static int ab8500_btemp_measure_temp(struct ab8500_btemp *di)
 454{
 455        int temp;
 456        static int prev;
 457        int rbat, rntc, vntc;
 458        u8 id;
 459
 460        id = di->bat->batt_id;
 461
 462        if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL &&
 463                        id != BATTERY_UNKNOWN) {
 464
 465                rbat = ab8500_btemp_get_batctrl_res(di);
 466                if (rbat < 0) {
 467                        dev_err(di->dev, "%s get batctrl res failed\n",
 468                                __func__);
 469                        /*
 470                         * Return out-of-range temperature so that
 471                         * charging is stopped
 472                         */
 473                        return BTEMP_THERMAL_LOW_LIMIT;
 474                }
 475
 476                temp = ab8500_btemp_res_to_temp(di,
 477                        di->bat->bat_type[id].r_to_t_tbl,
 478                        di->bat->bat_type[id].n_temp_tbl_elements, rbat);
 479        } else {
 480                vntc = ab8500_gpadc_convert(di->gpadc, BTEMP_BALL);
 481                if (vntc < 0) {
 482                        dev_err(di->dev,
 483                                "%s gpadc conversion failed,"
 484                                " using previous value\n", __func__);
 485                        return prev;
 486                }
 487                /*
 488                 * The PCB NTC is sourced from VTVOUT via a 230kOhm
 489                 * resistor.
 490                 */
 491                rntc = 230000 * vntc / (VTVOUT_V - vntc);
 492
 493                temp = ab8500_btemp_res_to_temp(di,
 494                        di->bat->bat_type[id].r_to_t_tbl,
 495                        di->bat->bat_type[id].n_temp_tbl_elements, rntc);
 496                prev = temp;
 497        }
 498        dev_dbg(di->dev, "Battery temperature is %d\n", temp);
 499        return temp;
 500}
 501
 502/**
 503 * ab8500_btemp_id() - Identify the connected battery
 504 * @di:         pointer to the ab8500_btemp structure
 505 *
 506 * This function will try to identify the battery by reading the ID
 507 * resistor. Some brands use a combined ID resistor with a NTC resistor to
 508 * both be able to identify and to read the temperature of it.
 509 */
 510static int ab8500_btemp_id(struct ab8500_btemp *di)
 511{
 512        int res;
 513        u8 i;
 514
 515        di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
 516        di->bat->batt_id = BATTERY_UNKNOWN;
 517
 518        res =  ab8500_btemp_get_batctrl_res(di);
 519        if (res < 0) {
 520                dev_err(di->dev, "%s get batctrl res failed\n", __func__);
 521                return -ENXIO;
 522        }
 523
 524        /* BATTERY_UNKNOWN is defined on position 0, skip it! */
 525        for (i = BATTERY_UNKNOWN + 1; i < di->bat->n_btypes; i++) {
 526                if ((res <= di->bat->bat_type[i].resis_high) &&
 527                        (res >= di->bat->bat_type[i].resis_low)) {
 528                        dev_dbg(di->dev, "Battery detected on %s"
 529                                " low %d < res %d < high: %d"
 530                                " index: %d\n",
 531                                di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL ?
 532                                "BATCTRL" : "BATTEMP",
 533                                di->bat->bat_type[i].resis_low, res,
 534                                di->bat->bat_type[i].resis_high, i);
 535
 536                        di->bat->batt_id = i;
 537                        break;
 538                }
 539        }
 540
 541        if (di->bat->batt_id == BATTERY_UNKNOWN) {
 542                dev_warn(di->dev, "Battery identified as unknown"
 543                        ", resistance %d Ohm\n", res);
 544                return -ENXIO;
 545        }
 546
 547        /*
 548         * We only have to change current source if the
 549         * detected type is Type 1, else we use the 7uA source
 550         */
 551        if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL &&
 552                        di->bat->batt_id == 1) {
 553                dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n");
 554                di->curr_source = BTEMP_BATCTRL_CURR_SRC_20UA;
 555        }
 556
 557        return di->bat->batt_id;
 558}
 559
 560/**
 561 * ab8500_btemp_periodic_work() - Measuring the temperature periodically
 562 * @work:       pointer to the work_struct structure
 563 *
 564 * Work function for measuring the temperature periodically
 565 */
 566static void ab8500_btemp_periodic_work(struct work_struct *work)
 567{
 568        int interval;
 569        struct ab8500_btemp *di = container_of(work,
 570                struct ab8500_btemp, btemp_periodic_work.work);
 571
 572        di->bat_temp = ab8500_btemp_measure_temp(di);
 573
 574        if (di->bat_temp != di->prev_bat_temp) {
 575                di->prev_bat_temp = di->bat_temp;
 576                power_supply_changed(&di->btemp_psy);
 577        }
 578
 579        if (di->events.ac_conn || di->events.usb_conn)
 580                interval = di->bat->temp_interval_chg;
 581        else
 582                interval = di->bat->temp_interval_nochg;
 583
 584        /* Schedule a new measurement */
 585        queue_delayed_work(di->btemp_wq,
 586                &di->btemp_periodic_work,
 587                round_jiffies(interval * HZ));
 588}
 589
 590/**
 591 * ab8500_btemp_batctrlindb_handler() - battery removal detected
 592 * @irq:       interrupt number
 593 * @_di:       void pointer that has to address of ab8500_btemp
 594 *
 595 * Returns IRQ status(IRQ_HANDLED)
 596 */
 597static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
 598{
 599        struct ab8500_btemp *di = _di;
 600        dev_err(di->dev, "Battery removal detected!\n");
 601
 602        di->events.batt_rem = true;
 603        power_supply_changed(&di->btemp_psy);
 604
 605        return IRQ_HANDLED;
 606}
 607
 608/**
 609 * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
 610 * @irq:       interrupt number
 611 * @_di:       void pointer that has to address of ab8500_btemp
 612 *
 613 * Returns IRQ status(IRQ_HANDLED)
 614 */
 615static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
 616{
 617        struct ab8500_btemp *di = _di;
 618
 619        if (is_ab8500_2p0_or_earlier(di->parent)) {
 620                dev_dbg(di->dev, "Ignore false btemp low irq"
 621                        " for ABB cut 1.0, 1.1 and 2.0\n");
 622        } else {
 623                dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
 624
 625                di->events.btemp_low = true;
 626                di->events.btemp_high = false;
 627                di->events.btemp_medhigh = false;
 628                di->events.btemp_lowmed = false;
 629                power_supply_changed(&di->btemp_psy);
 630        }
 631
 632        return IRQ_HANDLED;
 633}
 634
 635/**
 636 * ab8500_btemp_temphigh_handler() - battery temp higher than max temp
 637 * @irq:       interrupt number
 638 * @_di:       void pointer that has to address of ab8500_btemp
 639 *
 640 * Returns IRQ status(IRQ_HANDLED)
 641 */
 642static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
 643{
 644        struct ab8500_btemp *di = _di;
 645
 646        dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
 647
 648        di->events.btemp_high = true;
 649        di->events.btemp_medhigh = false;
 650        di->events.btemp_lowmed = false;
 651        di->events.btemp_low = false;
 652        power_supply_changed(&di->btemp_psy);
 653
 654        return IRQ_HANDLED;
 655}
 656
 657/**
 658 * ab8500_btemp_lowmed_handler() - battery temp between low and medium
 659 * @irq:       interrupt number
 660 * @_di:       void pointer that has to address of ab8500_btemp
 661 *
 662 * Returns IRQ status(IRQ_HANDLED)
 663 */
 664static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
 665{
 666        struct ab8500_btemp *di = _di;
 667
 668        dev_dbg(di->dev, "Battery temperature is between low and medium\n");
 669
 670        di->events.btemp_lowmed = true;
 671        di->events.btemp_medhigh = false;
 672        di->events.btemp_high = false;
 673        di->events.btemp_low = false;
 674        power_supply_changed(&di->btemp_psy);
 675
 676        return IRQ_HANDLED;
 677}
 678
 679/**
 680 * ab8500_btemp_medhigh_handler() - battery temp between medium and high
 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_medhigh_handler(int irq, void *_di)
 687{
 688        struct ab8500_btemp *di = _di;
 689
 690        dev_dbg(di->dev, "Battery temperature is between medium and high\n");
 691
 692        di->events.btemp_medhigh = true;
 693        di->events.btemp_lowmed = false;
 694        di->events.btemp_high = false;
 695        di->events.btemp_low = false;
 696        power_supply_changed(&di->btemp_psy);
 697
 698        return IRQ_HANDLED;
 699}
 700
 701/**
 702 * ab8500_btemp_periodic() - Periodic temperature measurements
 703 * @di:         pointer to the ab8500_btemp structure
 704 * @enable:     enable or disable periodic temperature measurements
 705 *
 706 * Starts of stops periodic temperature measurements. Periodic measurements
 707 * should only be done when a charger is connected.
 708 */
 709static void ab8500_btemp_periodic(struct ab8500_btemp *di,
 710        bool enable)
 711{
 712        dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
 713                enable);
 714        /*
 715         * Make sure a new measurement is done directly by cancelling
 716         * any pending work
 717         */
 718        cancel_delayed_work_sync(&di->btemp_periodic_work);
 719
 720        if (enable)
 721                queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
 722}
 723
 724/**
 725 * ab8500_btemp_get_temp() - get battery temperature
 726 * @di:         pointer to the ab8500_btemp structure
 727 *
 728 * Returns battery temperature
 729 */
 730static int ab8500_btemp_get_temp(struct ab8500_btemp *di)
 731{
 732        int temp = 0;
 733
 734        /*
 735         * The BTEMP events are not reliabe on AB8500 cut2.0
 736         * and prior versions
 737         */
 738        if (is_ab8500_2p0_or_earlier(di->parent)) {
 739                temp = di->bat_temp * 10;
 740        } else {
 741                if (di->events.btemp_low) {
 742                        if (temp > di->btemp_ranges.btemp_low_limit)
 743                                temp = di->btemp_ranges.btemp_low_limit;
 744                        else
 745                                temp = di->bat_temp * 10;
 746                } else if (di->events.btemp_high) {
 747                        if (temp < di->btemp_ranges.btemp_high_limit)
 748                                temp = di->btemp_ranges.btemp_high_limit;
 749                        else
 750                                temp = di->bat_temp * 10;
 751                } else if (di->events.btemp_lowmed) {
 752                        if (temp > di->btemp_ranges.btemp_med_limit)
 753                                temp = di->btemp_ranges.btemp_med_limit;
 754                        else
 755                                temp = di->bat_temp * 10;
 756                } else if (di->events.btemp_medhigh) {
 757                        if (temp < di->btemp_ranges.btemp_med_limit)
 758                                temp = di->btemp_ranges.btemp_med_limit;
 759                        else
 760                                temp = di->bat_temp * 10;
 761                } else
 762                        temp = di->bat_temp * 10;
 763        }
 764        return temp;
 765}
 766
 767/**
 768 * ab8500_btemp_get_batctrl_temp() - get the temperature
 769 * @btemp:      pointer to the btemp structure
 770 *
 771 * Returns the batctrl temperature in millidegrees
 772 */
 773int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp *btemp)
 774{
 775        return btemp->bat_temp * 1000;
 776}
 777
 778/**
 779 * ab8500_btemp_get_property() - get the btemp properties
 780 * @psy:        pointer to the power_supply structure
 781 * @psp:        pointer to the power_supply_property structure
 782 * @val:        pointer to the power_supply_propval union
 783 *
 784 * This function gets called when an application tries to get the btemp
 785 * properties by reading the sysfs files.
 786 * online:      presence of the battery
 787 * present:     presence of the battery
 788 * technology:  battery technology
 789 * temp:        battery temperature
 790 * Returns error code in case of failure else 0(on success)
 791 */
 792static int ab8500_btemp_get_property(struct power_supply *psy,
 793        enum power_supply_property psp,
 794        union power_supply_propval *val)
 795{
 796        struct ab8500_btemp *di;
 797
 798        di = to_ab8500_btemp_device_info(psy);
 799
 800        switch (psp) {
 801        case POWER_SUPPLY_PROP_PRESENT:
 802        case POWER_SUPPLY_PROP_ONLINE:
 803                if (di->events.batt_rem)
 804                        val->intval = 0;
 805                else
 806                        val->intval = 1;
 807                break;
 808        case POWER_SUPPLY_PROP_TECHNOLOGY:
 809                val->intval = di->bat->bat_type[di->bat->batt_id].name;
 810                break;
 811        case POWER_SUPPLY_PROP_TEMP:
 812                val->intval = ab8500_btemp_get_temp(di);
 813                break;
 814        default:
 815                return -EINVAL;
 816        }
 817        return 0;
 818}
 819
 820static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
 821{
 822        struct power_supply *psy;
 823        struct power_supply *ext;
 824        struct ab8500_btemp *di;
 825        union power_supply_propval ret;
 826        int i, j;
 827        bool psy_found = false;
 828
 829        psy = (struct power_supply *)data;
 830        ext = dev_get_drvdata(dev);
 831        di = to_ab8500_btemp_device_info(psy);
 832
 833        /*
 834         * For all psy where the name of your driver
 835         * appears in any supplied_to
 836         */
 837        for (i = 0; i < ext->num_supplicants; i++) {
 838                if (!strcmp(ext->supplied_to[i], psy->name))
 839                        psy_found = true;
 840        }
 841
 842        if (!psy_found)
 843                return 0;
 844
 845        /* Go through all properties for the psy */
 846        for (j = 0; j < ext->num_properties; j++) {
 847                enum power_supply_property prop;
 848                prop = ext->properties[j];
 849
 850                if (ext->get_property(ext, prop, &ret))
 851                        continue;
 852
 853                switch (prop) {
 854                case POWER_SUPPLY_PROP_PRESENT:
 855                        switch (ext->type) {
 856                        case POWER_SUPPLY_TYPE_MAINS:
 857                                /* AC disconnected */
 858                                if (!ret.intval && di->events.ac_conn) {
 859                                        di->events.ac_conn = false;
 860                                }
 861                                /* AC connected */
 862                                else if (ret.intval && !di->events.ac_conn) {
 863                                        di->events.ac_conn = true;
 864                                        if (!di->events.usb_conn)
 865                                                ab8500_btemp_periodic(di, true);
 866                                }
 867                                break;
 868                        case POWER_SUPPLY_TYPE_USB:
 869                                /* USB disconnected */
 870                                if (!ret.intval && di->events.usb_conn) {
 871                                        di->events.usb_conn = false;
 872                                }
 873                                /* USB connected */
 874                                else if (ret.intval && !di->events.usb_conn) {
 875                                        di->events.usb_conn = true;
 876                                        if (!di->events.ac_conn)
 877                                                ab8500_btemp_periodic(di, true);
 878                                }
 879                                break;
 880                        default:
 881                                break;
 882                        }
 883                        break;
 884                default:
 885                        break;
 886                }
 887        }
 888        return 0;
 889}
 890
 891/**
 892 * ab8500_btemp_external_power_changed() - callback for power supply changes
 893 * @psy:       pointer to the structure power_supply
 894 *
 895 * This function is pointing to the function pointer external_power_changed
 896 * of the structure power_supply.
 897 * This function gets executed when there is a change in the external power
 898 * supply to the btemp.
 899 */
 900static void ab8500_btemp_external_power_changed(struct power_supply *psy)
 901{
 902        struct ab8500_btemp *di = to_ab8500_btemp_device_info(psy);
 903
 904        class_for_each_device(power_supply_class, NULL,
 905                &di->btemp_psy, ab8500_btemp_get_ext_psy_data);
 906}
 907
 908/* ab8500 btemp driver interrupts and their respective isr */
 909static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {
 910        {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
 911        {"BTEMP_LOW", ab8500_btemp_templow_handler},
 912        {"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
 913        {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
 914        {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
 915};
 916
 917#if defined(CONFIG_PM)
 918static int ab8500_btemp_resume(struct platform_device *pdev)
 919{
 920        struct ab8500_btemp *di = platform_get_drvdata(pdev);
 921
 922        ab8500_btemp_periodic(di, true);
 923
 924        return 0;
 925}
 926
 927static int ab8500_btemp_suspend(struct platform_device *pdev,
 928        pm_message_t state)
 929{
 930        struct ab8500_btemp *di = platform_get_drvdata(pdev);
 931
 932        ab8500_btemp_periodic(di, false);
 933
 934        return 0;
 935}
 936#else
 937#define ab8500_btemp_suspend      NULL
 938#define ab8500_btemp_resume       NULL
 939#endif
 940
 941static int ab8500_btemp_remove(struct platform_device *pdev)
 942{
 943        struct ab8500_btemp *di = platform_get_drvdata(pdev);
 944        int i, irq;
 945
 946        /* Disable interrupts */
 947        for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
 948                irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
 949                free_irq(irq, di);
 950        }
 951
 952        /* Delete the work queue */
 953        destroy_workqueue(di->btemp_wq);
 954
 955        flush_scheduled_work();
 956        power_supply_unregister(&di->btemp_psy);
 957        platform_set_drvdata(pdev, NULL);
 958
 959        return 0;
 960}
 961
 962static char *supply_interface[] = {
 963        "ab8500_chargalg",
 964        "ab8500_fg",
 965};
 966
 967static int ab8500_btemp_probe(struct platform_device *pdev)
 968{
 969        struct device_node *np = pdev->dev.of_node;
 970        struct ab8500_btemp *di;
 971        int irq, i, ret = 0;
 972        u8 val;
 973
 974        di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
 975        if (!di) {
 976                dev_err(&pdev->dev, "%s no mem for ab8500_btemp\n", __func__);
 977                return -ENOMEM;
 978        }
 979        di->bat = pdev->mfd_cell->platform_data;
 980        if (!di->bat) {
 981                if (np) {
 982                        ret = bmdevs_of_probe(&pdev->dev, np, &di->bat);
 983                        if (ret) {
 984                                dev_err(&pdev->dev,
 985                                        "failed to get battery information\n");
 986                                return ret;
 987                        }
 988                } else {
 989                        dev_err(&pdev->dev, "missing dt node for ab8500_btemp\n");
 990                        return -EINVAL;
 991                }
 992        } else {
 993                dev_info(&pdev->dev, "falling back to legacy platform data\n");
 994        }
 995
 996        /* get parent data */
 997        di->dev = &pdev->dev;
 998        di->parent = dev_get_drvdata(pdev->dev.parent);
 999        di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
1000
1001        /* BTEMP supply */
1002        di->btemp_psy.name = "ab8500_btemp";
1003        di->btemp_psy.type = POWER_SUPPLY_TYPE_BATTERY;
1004        di->btemp_psy.properties = ab8500_btemp_props;
1005        di->btemp_psy.num_properties = ARRAY_SIZE(ab8500_btemp_props);
1006        di->btemp_psy.get_property = ab8500_btemp_get_property;
1007        di->btemp_psy.supplied_to = supply_interface;
1008        di->btemp_psy.num_supplicants = ARRAY_SIZE(supply_interface);
1009        di->btemp_psy.external_power_changed =
1010                ab8500_btemp_external_power_changed;
1011
1012
1013        /* Create a work queue for the btemp */
1014        di->btemp_wq =
1015                create_singlethread_workqueue("ab8500_btemp_wq");
1016        if (di->btemp_wq == NULL) {
1017                dev_err(di->dev, "failed to create work queue\n");
1018                return -ENOMEM;
1019        }
1020
1021        /* Init work for measuring temperature periodically */
1022        INIT_DEFERRABLE_WORK(&di->btemp_periodic_work,
1023                ab8500_btemp_periodic_work);
1024
1025        /* Identify the battery */
1026        if (ab8500_btemp_id(di) < 0)
1027                dev_warn(di->dev, "failed to identify the battery\n");
1028
1029        /* Set BTEMP thermal limits. Low and Med are fixed */
1030        di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
1031        di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
1032
1033        ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1034                AB8500_BTEMP_HIGH_TH, &val);
1035        if (ret < 0) {
1036                dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1037                goto free_btemp_wq;
1038        }
1039        switch (val) {
1040        case BTEMP_HIGH_TH_57_0:
1041        case BTEMP_HIGH_TH_57_1:
1042                di->btemp_ranges.btemp_high_limit =
1043                        BTEMP_THERMAL_HIGH_LIMIT_57;
1044                break;
1045        case BTEMP_HIGH_TH_52:
1046                di->btemp_ranges.btemp_high_limit =
1047                        BTEMP_THERMAL_HIGH_LIMIT_52;
1048                break;
1049        case BTEMP_HIGH_TH_62:
1050                di->btemp_ranges.btemp_high_limit =
1051                        BTEMP_THERMAL_HIGH_LIMIT_62;
1052                break;
1053        }
1054
1055        /* Register BTEMP power supply class */
1056        ret = power_supply_register(di->dev, &di->btemp_psy);
1057        if (ret) {
1058                dev_err(di->dev, "failed to register BTEMP psy\n");
1059                goto free_btemp_wq;
1060        }
1061
1062        /* Register interrupts */
1063        for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
1064                irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1065                ret = request_threaded_irq(irq, NULL, ab8500_btemp_irq[i].isr,
1066                        IRQF_SHARED | IRQF_NO_SUSPEND,
1067                        ab8500_btemp_irq[i].name, di);
1068
1069                if (ret) {
1070                        dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
1071                                , ab8500_btemp_irq[i].name, irq, ret);
1072                        goto free_irq;
1073                }
1074                dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
1075                        ab8500_btemp_irq[i].name, irq, ret);
1076        }
1077
1078        platform_set_drvdata(pdev, di);
1079
1080        /* Kick off periodic temperature measurements */
1081        ab8500_btemp_periodic(di, true);
1082        list_add_tail(&di->node, &ab8500_btemp_list);
1083
1084        return ret;
1085
1086free_irq:
1087        power_supply_unregister(&di->btemp_psy);
1088
1089        /* We also have to free all successfully registered irqs */
1090        for (i = i - 1; i >= 0; i--) {
1091                irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
1092                free_irq(irq, di);
1093        }
1094free_btemp_wq:
1095        destroy_workqueue(di->btemp_wq);
1096        return ret;
1097}
1098
1099static const struct of_device_id ab8500_btemp_match[] = {
1100        { .compatible = "stericsson,ab8500-btemp", },
1101        { },
1102};
1103
1104static struct platform_driver ab8500_btemp_driver = {
1105        .probe = ab8500_btemp_probe,
1106        .remove = ab8500_btemp_remove,
1107        .suspend = ab8500_btemp_suspend,
1108        .resume = ab8500_btemp_resume,
1109        .driver = {
1110                .name = "ab8500-btemp",
1111                .owner = THIS_MODULE,
1112                .of_match_table = ab8500_btemp_match,
1113        },
1114};
1115
1116static int __init ab8500_btemp_init(void)
1117{
1118        return platform_driver_register(&ab8500_btemp_driver);
1119}
1120
1121static void __exit ab8500_btemp_exit(void)
1122{
1123        platform_driver_unregister(&ab8500_btemp_driver);
1124}
1125
1126subsys_initcall_sync(ab8500_btemp_init);
1127module_exit(ab8500_btemp_exit);
1128
1129MODULE_LICENSE("GPL v2");
1130MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
1131MODULE_ALIAS("platform:ab8500-btemp");
1132MODULE_DESCRIPTION("AB8500 battery temperature driver");
1133
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