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