1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) ST-Ericsson SA 2012 4 * 5 * Battery temperature driver for AB8500 6 * 7 * Author: 8 * Johan Palsson <johan.palsson@stericsson.com> 9 * Karl Komierowski <karl.komierowski@stericsson.com> 10 * Arun R Murthy <arun.murthy@stericsson.com> 11 */ 12 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/device.h> 16 #include <linux/interrupt.h> 17 #include <linux/delay.h> 18 #include <linux/slab.h> 19 #include <linux/platform_device.h> 20 #include <linux/power_supply.h> 21 #include <linux/completion.h> 22 #include <linux/workqueue.h> 23 #include <linux/jiffies.h> 24 #include <linux/of.h> 25 #include <linux/mfd/core.h> 26 #include <linux/mfd/abx500.h> 27 #include <linux/mfd/abx500/ab8500.h> 28 #include <linux/mfd/abx500/ab8500-bm.h> 29 #include <linux/iio/consumer.h> 30 31 #define VTVOUT_V 1800 32 33 #define BTEMP_THERMAL_LOW_LIMIT -10 34 #define BTEMP_THERMAL_MED_LIMIT 0 35 #define BTEMP_THERMAL_HIGH_LIMIT_52 52 36 #define BTEMP_THERMAL_HIGH_LIMIT_57 57 37 #define BTEMP_THERMAL_HIGH_LIMIT_62 62 38 39 #define BTEMP_BATCTRL_CURR_SRC_7UA 7 40 #define BTEMP_BATCTRL_CURR_SRC_20UA 20 41 42 #define BTEMP_BATCTRL_CURR_SRC_16UA 16 43 #define BTEMP_BATCTRL_CURR_SRC_18UA 18 44 45 #define BTEMP_BATCTRL_CURR_SRC_60UA 60 46 #define BTEMP_BATCTRL_CURR_SRC_120UA 120 47 48 /** 49 * struct ab8500_btemp_interrupts - ab8500 interrupts 50 * @name: name of the interrupt 51 * @isr function pointer to the isr 52 */ 53 struct ab8500_btemp_interrupts { 54 char *name; 55 irqreturn_t (*isr)(int irq, void *data); 56 }; 57 58 struct ab8500_btemp_events { 59 bool batt_rem; 60 bool btemp_high; 61 bool btemp_medhigh; 62 bool btemp_lowmed; 63 bool btemp_low; 64 bool ac_conn; 65 bool usb_conn; 66 }; 67 68 struct ab8500_btemp_ranges { 69 int btemp_high_limit; 70 int btemp_med_limit; 71 int btemp_low_limit; 72 }; 73 74 /** 75 * struct ab8500_btemp - ab8500 BTEMP device information 76 * @dev: Pointer to the structure device 77 * @node: List of AB8500 BTEMPs, hence prepared for reentrance 78 * @curr_source: What current source we use, in uA 79 * @bat_temp: Dispatched battery temperature in degree Celsius 80 * @prev_bat_temp Last measured battery temperature in degree Celsius 81 * @parent: Pointer to the struct ab8500 82 * @adc_btemp_ball: ADC channel for the battery ball temperature 83 * @adc_bat_ctrl: ADC channel for the battery control 84 * @fg: Pointer to the struct fg 85 * @bm: Platform specific battery management information 86 * @btemp_psy: Structure for BTEMP specific battery properties 87 * @events: Structure for information about events triggered 88 * @btemp_ranges: Battery temperature range structure 89 * @btemp_wq: Work queue for measuring the temperature periodically 90 * @btemp_periodic_work: Work for measuring the temperature periodically 91 * @initialized: True if battery id read. 92 */ 93 struct ab8500_btemp { 94 struct device *dev; 95 struct list_head node; 96 int curr_source; 97 int bat_temp; 98 int prev_bat_temp; 99 struct ab8500 *parent; 100 struct iio_channel *btemp_ball; 101 struct iio_channel *bat_ctrl; 102 struct ab8500_fg *fg; 103 struct abx500_bm_data *bm; 104 struct power_supply *btemp_psy; 105 struct ab8500_btemp_events events; 106 struct ab8500_btemp_ranges btemp_ranges; 107 struct workqueue_struct *btemp_wq; 108 struct delayed_work btemp_periodic_work; 109 bool initialized; 110 }; 111 112 /* BTEMP power supply properties */ 113 static enum power_supply_property ab8500_btemp_props[] = { 114 POWER_SUPPLY_PROP_PRESENT, 115 POWER_SUPPLY_PROP_ONLINE, 116 POWER_SUPPLY_PROP_TECHNOLOGY, 117 POWER_SUPPLY_PROP_TEMP, 118 }; 119 120 static LIST_HEAD(ab8500_btemp_list); 121 122 /** 123 * ab8500_btemp_get() - returns a reference to the primary AB8500 BTEMP 124 * (i.e. the first BTEMP in the instance list) 125 */ 126 struct ab8500_btemp *ab8500_btemp_get(void) 127 { 128 return list_first_entry(&ab8500_btemp_list, struct ab8500_btemp, node); 129 } 130 EXPORT_SYMBOL(ab8500_btemp_get); 131 132 /** 133 * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance 134 * @di: pointer to the ab8500_btemp structure 135 * @v_batctrl: measured batctrl voltage 136 * @inst_curr: measured instant current 137 * 138 * This function returns the battery resistance that is 139 * derived from the BATCTRL voltage. 140 * Returns value in Ohms. 141 */ 142 static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di, 143 int v_batctrl, int inst_curr) 144 { 145 int rbs; 146 147 if (is_ab8500_1p1_or_earlier(di->parent)) { 148 /* 149 * For ABB cut1.0 and 1.1 BAT_CTRL is internally 150 * connected to 1.8V through a 450k resistor 151 */ 152 return (450000 * (v_batctrl)) / (1800 - v_batctrl); 153 } 154 155 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL) { 156 /* 157 * If the battery has internal NTC, we use the current 158 * source to calculate the resistance. 159 */ 160 rbs = (v_batctrl * 1000 161 - di->bm->gnd_lift_resistance * inst_curr) 162 / di->curr_source; 163 } else { 164 /* 165 * BAT_CTRL is internally 166 * connected to 1.8V through a 80k resistor 167 */ 168 rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl); 169 } 170 171 return rbs; 172 } 173 174 /** 175 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage 176 * @di: pointer to the ab8500_btemp structure 177 * 178 * This function returns the voltage on BATCTRL. Returns value in mV. 179 */ 180 static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di) 181 { 182 int vbtemp, ret; 183 static int prev; 184 185 ret = iio_read_channel_processed(di->bat_ctrl, &vbtemp); 186 if (ret < 0) { 187 dev_err(di->dev, 188 "%s ADC conversion failed, using previous value", 189 __func__); 190 return prev; 191 } 192 prev = vbtemp; 193 return vbtemp; 194 } 195 196 /** 197 * ab8500_btemp_curr_source_enable() - enable/disable batctrl current source 198 * @di: pointer to the ab8500_btemp structure 199 * @enable: enable or disable the current source 200 * 201 * Enable or disable the current sources for the BatCtrl AD channel 202 */ 203 static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di, 204 bool enable) 205 { 206 int curr; 207 int ret = 0; 208 209 /* 210 * BATCTRL current sources are included on AB8500 cut2.0 211 * and future versions 212 */ 213 if (is_ab8500_1p1_or_earlier(di->parent)) 214 return 0; 215 216 /* Only do this for batteries with internal NTC */ 217 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) { 218 219 if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA) 220 curr = BAT_CTRL_7U_ENA; 221 else 222 curr = BAT_CTRL_20U_ENA; 223 224 dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source); 225 226 ret = abx500_mask_and_set_register_interruptible(di->dev, 227 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 228 FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH); 229 if (ret) { 230 dev_err(di->dev, "%s failed setting cmp_force\n", 231 __func__); 232 return ret; 233 } 234 235 /* 236 * We have to wait one 32kHz cycle before enabling 237 * the current source, since ForceBatCtrlCmpHigh needs 238 * to be written in a separate cycle 239 */ 240 udelay(32); 241 242 ret = abx500_set_register_interruptible(di->dev, 243 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 244 FORCE_BAT_CTRL_CMP_HIGH | curr); 245 if (ret) { 246 dev_err(di->dev, "%s failed enabling current source\n", 247 __func__); 248 goto disable_curr_source; 249 } 250 } else if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) { 251 dev_dbg(di->dev, "Disable BATCTRL curr source\n"); 252 253 /* Write 0 to the curr bits */ 254 ret = abx500_mask_and_set_register_interruptible( 255 di->dev, 256 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 257 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA, 258 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA)); 259 260 if (ret) { 261 dev_err(di->dev, "%s failed disabling current source\n", 262 __func__); 263 goto disable_curr_source; 264 } 265 266 /* Enable Pull-Up and comparator */ 267 ret = abx500_mask_and_set_register_interruptible(di->dev, 268 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 269 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA, 270 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA); 271 if (ret) { 272 dev_err(di->dev, "%s failed enabling PU and comp\n", 273 __func__); 274 goto enable_pu_comp; 275 } 276 277 /* 278 * We have to wait one 32kHz cycle before disabling 279 * ForceBatCtrlCmpHigh since this needs to be written 280 * in a separate cycle 281 */ 282 udelay(32); 283 284 /* Disable 'force comparator' */ 285 ret = abx500_mask_and_set_register_interruptible(di->dev, 286 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 287 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH); 288 if (ret) { 289 dev_err(di->dev, "%s failed disabling force comp\n", 290 __func__); 291 goto disable_force_comp; 292 } 293 } 294 return ret; 295 296 /* 297 * We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time 298 * if we got an error above 299 */ 300 disable_curr_source: 301 /* Write 0 to the curr bits */ 302 ret = abx500_mask_and_set_register_interruptible(di->dev, 303 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 304 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA, 305 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA)); 306 307 if (ret) { 308 dev_err(di->dev, "%s failed disabling current source\n", 309 __func__); 310 return ret; 311 } 312 enable_pu_comp: 313 /* Enable Pull-Up and comparator */ 314 ret = abx500_mask_and_set_register_interruptible(di->dev, 315 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 316 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA, 317 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA); 318 if (ret) { 319 dev_err(di->dev, "%s failed enabling PU and comp\n", 320 __func__); 321 return ret; 322 } 323 324 disable_force_comp: 325 /* 326 * We have to wait one 32kHz cycle before disabling 327 * ForceBatCtrlCmpHigh since this needs to be written 328 * in a separate cycle 329 */ 330 udelay(32); 331 332 /* Disable 'force comparator' */ 333 ret = abx500_mask_and_set_register_interruptible(di->dev, 334 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 335 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH); 336 if (ret) { 337 dev_err(di->dev, "%s failed disabling force comp\n", 338 __func__); 339 return ret; 340 } 341 342 return ret; 343 } 344 345 /** 346 * ab8500_btemp_get_batctrl_res() - get battery resistance 347 * @di: pointer to the ab8500_btemp structure 348 * 349 * This function returns the battery pack identification resistance. 350 * Returns value in Ohms. 351 */ 352 static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di) 353 { 354 int ret; 355 int batctrl = 0; 356 int res; 357 int inst_curr; 358 int i; 359 360 /* 361 * BATCTRL current sources are included on AB8500 cut2.0 362 * and future versions 363 */ 364 ret = ab8500_btemp_curr_source_enable(di, true); 365 if (ret) { 366 dev_err(di->dev, "%s curr source enabled failed\n", __func__); 367 return ret; 368 } 369 370 if (!di->fg) 371 di->fg = ab8500_fg_get(); 372 if (!di->fg) { 373 dev_err(di->dev, "No fg found\n"); 374 return -EINVAL; 375 } 376 377 ret = ab8500_fg_inst_curr_start(di->fg); 378 379 if (ret) { 380 dev_err(di->dev, "Failed to start current measurement\n"); 381 return ret; 382 } 383 384 do { 385 msleep(20); 386 } while (!ab8500_fg_inst_curr_started(di->fg)); 387 388 i = 0; 389 390 do { 391 batctrl += ab8500_btemp_read_batctrl_voltage(di); 392 i++; 393 msleep(20); 394 } while (!ab8500_fg_inst_curr_done(di->fg)); 395 batctrl /= i; 396 397 ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr); 398 if (ret) { 399 dev_err(di->dev, "Failed to finalize current measurement\n"); 400 return ret; 401 } 402 403 res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr); 404 405 ret = ab8500_btemp_curr_source_enable(di, false); 406 if (ret) { 407 dev_err(di->dev, "%s curr source disable failed\n", __func__); 408 return ret; 409 } 410 411 dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n", 412 __func__, batctrl, res, inst_curr, i); 413 414 return res; 415 } 416 417 /** 418 * ab8500_btemp_res_to_temp() - resistance to temperature 419 * @di: pointer to the ab8500_btemp structure 420 * @tbl: pointer to the resiatance to temperature table 421 * @tbl_size: size of the resistance to temperature table 422 * @res: resistance to calculate the temperature from 423 * 424 * This function returns the battery temperature in degrees Celsius 425 * based on the NTC resistance. 426 */ 427 static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di, 428 const struct abx500_res_to_temp *tbl, int tbl_size, int res) 429 { 430 int i; 431 /* 432 * Calculate the formula for the straight line 433 * Simple interpolation if we are within 434 * the resistance table limits, extrapolate 435 * if resistance is outside the limits. 436 */ 437 if (res > tbl[0].resist) 438 i = 0; 439 else if (res <= tbl[tbl_size - 1].resist) 440 i = tbl_size - 2; 441 else { 442 i = 0; 443 while (!(res <= tbl[i].resist && 444 res > tbl[i + 1].resist)) 445 i++; 446 } 447 448 return tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) * 449 (res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist); 450 } 451 452 /** 453 * ab8500_btemp_measure_temp() - measure battery temperature 454 * @di: pointer to the ab8500_btemp structure 455 * 456 * Returns battery temperature (on success) else the previous temperature 457 */ 458 static int ab8500_btemp_measure_temp(struct ab8500_btemp *di) 459 { 460 int temp, ret; 461 static int prev; 462 int rbat, rntc, vntc; 463 u8 id; 464 465 id = di->bm->batt_id; 466 467 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && 468 id != BATTERY_UNKNOWN) { 469 470 rbat = ab8500_btemp_get_batctrl_res(di); 471 if (rbat < 0) { 472 dev_err(di->dev, "%s get batctrl res failed\n", 473 __func__); 474 /* 475 * Return out-of-range temperature so that 476 * charging is stopped 477 */ 478 return BTEMP_THERMAL_LOW_LIMIT; 479 } 480 481 temp = ab8500_btemp_res_to_temp(di, 482 di->bm->bat_type[id].r_to_t_tbl, 483 di->bm->bat_type[id].n_temp_tbl_elements, rbat); 484 } else { 485 ret = iio_read_channel_processed(di->btemp_ball, &vntc); 486 if (ret < 0) { 487 dev_err(di->dev, 488 "%s ADC conversion failed," 489 " using previous value\n", __func__); 490 return prev; 491 } 492 /* 493 * The PCB NTC is sourced from VTVOUT via a 230kOhm 494 * resistor. 495 */ 496 rntc = 230000 * vntc / (VTVOUT_V - vntc); 497 498 temp = ab8500_btemp_res_to_temp(di, 499 di->bm->bat_type[id].r_to_t_tbl, 500 di->bm->bat_type[id].n_temp_tbl_elements, rntc); 501 prev = temp; 502 } 503 dev_dbg(di->dev, "Battery temperature is %d\n", temp); 504 return temp; 505 } 506 507 /** 508 * ab8500_btemp_id() - Identify the connected battery 509 * @di: pointer to the ab8500_btemp structure 510 * 511 * This function will try to identify the battery by reading the ID 512 * resistor. Some brands use a combined ID resistor with a NTC resistor to 513 * both be able to identify and to read the temperature of it. 514 */ 515 static int ab8500_btemp_id(struct ab8500_btemp *di) 516 { 517 int res; 518 u8 i; 519 520 di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA; 521 di->bm->batt_id = BATTERY_UNKNOWN; 522 523 res = ab8500_btemp_get_batctrl_res(di); 524 if (res < 0) { 525 dev_err(di->dev, "%s get batctrl res failed\n", __func__); 526 return -ENXIO; 527 } 528 529 /* BATTERY_UNKNOWN is defined on position 0, skip it! */ 530 for (i = BATTERY_UNKNOWN + 1; i < di->bm->n_btypes; i++) { 531 if ((res <= di->bm->bat_type[i].resis_high) && 532 (res >= di->bm->bat_type[i].resis_low)) { 533 dev_dbg(di->dev, "Battery detected on %s" 534 " low %d < res %d < high: %d" 535 " index: %d\n", 536 di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL ? 537 "BATCTRL" : "BATTEMP", 538 di->bm->bat_type[i].resis_low, res, 539 di->bm->bat_type[i].resis_high, i); 540 541 di->bm->batt_id = i; 542 break; 543 } 544 } 545 546 if (di->bm->batt_id == BATTERY_UNKNOWN) { 547 dev_warn(di->dev, "Battery identified as unknown" 548 ", resistance %d Ohm\n", res); 549 return -ENXIO; 550 } 551 552 /* 553 * We only have to change current source if the 554 * detected type is Type 1. 555 */ 556 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && 557 di->bm->batt_id == 1) { 558 dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n"); 559 di->curr_source = BTEMP_BATCTRL_CURR_SRC_20UA; 560 } 561 562 return di->bm->batt_id; 563 } 564 565 /** 566 * ab8500_btemp_periodic_work() - Measuring the temperature periodically 567 * @work: pointer to the work_struct structure 568 * 569 * Work function for measuring the temperature periodically 570 */ 571 static void ab8500_btemp_periodic_work(struct work_struct *work) 572 { 573 int interval; 574 int bat_temp; 575 struct ab8500_btemp *di = container_of(work, 576 struct ab8500_btemp, btemp_periodic_work.work); 577 578 if (!di->initialized) { 579 /* Identify the battery */ 580 if (ab8500_btemp_id(di) < 0) 581 dev_warn(di->dev, "failed to identify the battery\n"); 582 } 583 584 bat_temp = ab8500_btemp_measure_temp(di); 585 /* 586 * Filter battery temperature. 587 * Allow direct updates on temperature only if two samples result in 588 * same temperature. Else only allow 1 degree change from previous 589 * reported value in the direction of the new measurement. 590 */ 591 if ((bat_temp == di->prev_bat_temp) || !di->initialized) { 592 if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) { 593 di->initialized = true; 594 di->bat_temp = bat_temp; 595 power_supply_changed(di->btemp_psy); 596 } 597 } else if (bat_temp < di->prev_bat_temp) { 598 di->bat_temp--; 599 power_supply_changed(di->btemp_psy); 600 } else if (bat_temp > di->prev_bat_temp) { 601 di->bat_temp++; 602 power_supply_changed(di->btemp_psy); 603 } 604 di->prev_bat_temp = bat_temp; 605 606 if (di->events.ac_conn || di->events.usb_conn) 607 interval = di->bm->temp_interval_chg; 608 else 609 interval = di->bm->temp_interval_nochg; 610 611 /* Schedule a new measurement */ 612 queue_delayed_work(di->btemp_wq, 613 &di->btemp_periodic_work, 614 round_jiffies(interval * HZ)); 615 } 616 617 /** 618 * ab8500_btemp_batctrlindb_handler() - battery removal detected 619 * @irq: interrupt number 620 * @_di: void pointer that has to address of ab8500_btemp 621 * 622 * Returns IRQ status(IRQ_HANDLED) 623 */ 624 static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di) 625 { 626 struct ab8500_btemp *di = _di; 627 dev_err(di->dev, "Battery removal detected!\n"); 628 629 di->events.batt_rem = true; 630 power_supply_changed(di->btemp_psy); 631 632 return IRQ_HANDLED; 633 } 634 635 /** 636 * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees 637 * @irq: interrupt number 638 * @_di: void pointer that has to address of ab8500_btemp 639 * 640 * Returns IRQ status(IRQ_HANDLED) 641 */ 642 static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di) 643 { 644 struct ab8500_btemp *di = _di; 645 646 if (is_ab8500_3p3_or_earlier(di->parent)) { 647 dev_dbg(di->dev, "Ignore false btemp low irq" 648 " for ABB cut 1.0, 1.1, 2.0 and 3.3\n"); 649 } else { 650 dev_crit(di->dev, "Battery temperature lower than -10deg c\n"); 651 652 di->events.btemp_low = true; 653 di->events.btemp_high = false; 654 di->events.btemp_medhigh = false; 655 di->events.btemp_lowmed = false; 656 power_supply_changed(di->btemp_psy); 657 } 658 659 return IRQ_HANDLED; 660 } 661 662 /** 663 * ab8500_btemp_temphigh_handler() - battery temp higher than max temp 664 * @irq: interrupt number 665 * @_di: void pointer that has to address of ab8500_btemp 666 * 667 * Returns IRQ status(IRQ_HANDLED) 668 */ 669 static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di) 670 { 671 struct ab8500_btemp *di = _di; 672 673 dev_crit(di->dev, "Battery temperature is higher than MAX temp\n"); 674 675 di->events.btemp_high = true; 676 di->events.btemp_medhigh = false; 677 di->events.btemp_lowmed = false; 678 di->events.btemp_low = false; 679 power_supply_changed(di->btemp_psy); 680 681 return IRQ_HANDLED; 682 } 683 684 /** 685 * ab8500_btemp_lowmed_handler() - battery temp between low and medium 686 * @irq: interrupt number 687 * @_di: void pointer that has to address of ab8500_btemp 688 * 689 * Returns IRQ status(IRQ_HANDLED) 690 */ 691 static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di) 692 { 693 struct ab8500_btemp *di = _di; 694 695 dev_dbg(di->dev, "Battery temperature is between low and medium\n"); 696 697 di->events.btemp_lowmed = true; 698 di->events.btemp_medhigh = false; 699 di->events.btemp_high = false; 700 di->events.btemp_low = false; 701 power_supply_changed(di->btemp_psy); 702 703 return IRQ_HANDLED; 704 } 705 706 /** 707 * ab8500_btemp_medhigh_handler() - battery temp between medium and high 708 * @irq: interrupt number 709 * @_di: void pointer that has to address of ab8500_btemp 710 * 711 * Returns IRQ status(IRQ_HANDLED) 712 */ 713 static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di) 714 { 715 struct ab8500_btemp *di = _di; 716 717 dev_dbg(di->dev, "Battery temperature is between medium and high\n"); 718 719 di->events.btemp_medhigh = true; 720 di->events.btemp_lowmed = false; 721 di->events.btemp_high = false; 722 di->events.btemp_low = false; 723 power_supply_changed(di->btemp_psy); 724 725 return IRQ_HANDLED; 726 } 727 728 /** 729 * ab8500_btemp_periodic() - Periodic temperature measurements 730 * @di: pointer to the ab8500_btemp structure 731 * @enable: enable or disable periodic temperature measurements 732 * 733 * Starts of stops periodic temperature measurements. Periodic measurements 734 * should only be done when a charger is connected. 735 */ 736 static void ab8500_btemp_periodic(struct ab8500_btemp *di, 737 bool enable) 738 { 739 dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n", 740 enable); 741 /* 742 * Make sure a new measurement is done directly by cancelling 743 * any pending work 744 */ 745 cancel_delayed_work_sync(&di->btemp_periodic_work); 746 747 if (enable) 748 queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0); 749 } 750 751 /** 752 * ab8500_btemp_get_temp() - get battery temperature 753 * @di: pointer to the ab8500_btemp structure 754 * 755 * Returns battery temperature 756 */ 757 int ab8500_btemp_get_temp(struct ab8500_btemp *di) 758 { 759 int temp = 0; 760 761 /* 762 * The BTEMP events are not reliabe on AB8500 cut3.3 763 * and prior versions 764 */ 765 if (is_ab8500_3p3_or_earlier(di->parent)) { 766 temp = di->bat_temp * 10; 767 } else { 768 if (di->events.btemp_low) { 769 if (temp > di->btemp_ranges.btemp_low_limit) 770 temp = di->btemp_ranges.btemp_low_limit * 10; 771 else 772 temp = di->bat_temp * 10; 773 } else if (di->events.btemp_high) { 774 if (temp < di->btemp_ranges.btemp_high_limit) 775 temp = di->btemp_ranges.btemp_high_limit * 10; 776 else 777 temp = di->bat_temp * 10; 778 } else if (di->events.btemp_lowmed) { 779 if (temp > di->btemp_ranges.btemp_med_limit) 780 temp = di->btemp_ranges.btemp_med_limit * 10; 781 else 782 temp = di->bat_temp * 10; 783 } else if (di->events.btemp_medhigh) { 784 if (temp < di->btemp_ranges.btemp_med_limit) 785 temp = di->btemp_ranges.btemp_med_limit * 10; 786 else 787 temp = di->bat_temp * 10; 788 } else 789 temp = di->bat_temp * 10; 790 } 791 return temp; 792 } 793 EXPORT_SYMBOL(ab8500_btemp_get_temp); 794 795 /** 796 * ab8500_btemp_get_batctrl_temp() - get the temperature 797 * @btemp: pointer to the btemp structure 798 * 799 * Returns the batctrl temperature in millidegrees 800 */ 801 int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp *btemp) 802 { 803 return btemp->bat_temp * 1000; 804 } 805 EXPORT_SYMBOL(ab8500_btemp_get_batctrl_temp); 806 807 /** 808 * ab8500_btemp_get_property() - get the btemp properties 809 * @psy: pointer to the power_supply structure 810 * @psp: pointer to the power_supply_property structure 811 * @val: pointer to the power_supply_propval union 812 * 813 * This function gets called when an application tries to get the btemp 814 * properties by reading the sysfs files. 815 * online: presence of the battery 816 * present: presence of the battery 817 * technology: battery technology 818 * temp: battery temperature 819 * Returns error code in case of failure else 0(on success) 820 */ 821 static int ab8500_btemp_get_property(struct power_supply *psy, 822 enum power_supply_property psp, 823 union power_supply_propval *val) 824 { 825 struct ab8500_btemp *di = power_supply_get_drvdata(psy); 826 827 switch (psp) { 828 case POWER_SUPPLY_PROP_PRESENT: 829 case POWER_SUPPLY_PROP_ONLINE: 830 if (di->events.batt_rem) 831 val->intval = 0; 832 else 833 val->intval = 1; 834 break; 835 case POWER_SUPPLY_PROP_TECHNOLOGY: 836 val->intval = di->bm->bat_type[di->bm->batt_id].name; 837 break; 838 case POWER_SUPPLY_PROP_TEMP: 839 val->intval = ab8500_btemp_get_temp(di); 840 break; 841 default: 842 return -EINVAL; 843 } 844 return 0; 845 } 846 847 static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data) 848 { 849 struct power_supply *psy; 850 struct power_supply *ext = dev_get_drvdata(dev); 851 const char **supplicants = (const char **)ext->supplied_to; 852 struct ab8500_btemp *di; 853 union power_supply_propval ret; 854 int j; 855 856 psy = (struct power_supply *)data; 857 di = power_supply_get_drvdata(psy); 858 859 /* 860 * For all psy where the name of your driver 861 * appears in any supplied_to 862 */ 863 j = match_string(supplicants, ext->num_supplicants, psy->desc->name); 864 if (j < 0) 865 return 0; 866 867 /* Go through all properties for the psy */ 868 for (j = 0; j < ext->desc->num_properties; j++) { 869 enum power_supply_property prop; 870 prop = ext->desc->properties[j]; 871 872 if (power_supply_get_property(ext, prop, &ret)) 873 continue; 874 875 switch (prop) { 876 case POWER_SUPPLY_PROP_PRESENT: 877 switch (ext->desc->type) { 878 case POWER_SUPPLY_TYPE_MAINS: 879 /* AC disconnected */ 880 if (!ret.intval && di->events.ac_conn) { 881 di->events.ac_conn = false; 882 } 883 /* AC connected */ 884 else if (ret.intval && !di->events.ac_conn) { 885 di->events.ac_conn = true; 886 if (!di->events.usb_conn) 887 ab8500_btemp_periodic(di, true); 888 } 889 break; 890 case POWER_SUPPLY_TYPE_USB: 891 /* USB disconnected */ 892 if (!ret.intval && di->events.usb_conn) { 893 di->events.usb_conn = false; 894 } 895 /* USB connected */ 896 else if (ret.intval && !di->events.usb_conn) { 897 di->events.usb_conn = true; 898 if (!di->events.ac_conn) 899 ab8500_btemp_periodic(di, true); 900 } 901 break; 902 default: 903 break; 904 } 905 break; 906 default: 907 break; 908 } 909 } 910 return 0; 911 } 912 913 /** 914 * ab8500_btemp_external_power_changed() - callback for power supply changes 915 * @psy: pointer to the structure power_supply 916 * 917 * This function is pointing to the function pointer external_power_changed 918 * of the structure power_supply. 919 * This function gets executed when there is a change in the external power 920 * supply to the btemp. 921 */ 922 static void ab8500_btemp_external_power_changed(struct power_supply *psy) 923 { 924 struct ab8500_btemp *di = power_supply_get_drvdata(psy); 925 926 class_for_each_device(power_supply_class, NULL, 927 di->btemp_psy, ab8500_btemp_get_ext_psy_data); 928 } 929 930 /* ab8500 btemp driver interrupts and their respective isr */ 931 static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = { 932 {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler}, 933 {"BTEMP_LOW", ab8500_btemp_templow_handler}, 934 {"BTEMP_HIGH", ab8500_btemp_temphigh_handler}, 935 {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler}, 936 {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler}, 937 }; 938 939 #if defined(CONFIG_PM) 940 static int ab8500_btemp_resume(struct platform_device *pdev) 941 { 942 struct ab8500_btemp *di = platform_get_drvdata(pdev); 943 944 ab8500_btemp_periodic(di, true); 945 946 return 0; 947 } 948 949 static int ab8500_btemp_suspend(struct platform_device *pdev, 950 pm_message_t state) 951 { 952 struct ab8500_btemp *di = platform_get_drvdata(pdev); 953 954 ab8500_btemp_periodic(di, false); 955 956 return 0; 957 } 958 #else 959 #define ab8500_btemp_suspend NULL 960 #define ab8500_btemp_resume NULL 961 #endif 962 963 static int ab8500_btemp_remove(struct platform_device *pdev) 964 { 965 struct ab8500_btemp *di = platform_get_drvdata(pdev); 966 int i, irq; 967 968 /* Disable interrupts */ 969 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) { 970 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name); 971 free_irq(irq, di); 972 } 973 974 /* Delete the work queue */ 975 destroy_workqueue(di->btemp_wq); 976 977 flush_scheduled_work(); 978 power_supply_unregister(di->btemp_psy); 979 980 return 0; 981 } 982 983 static char *supply_interface[] = { 984 "ab8500_chargalg", 985 "ab8500_fg", 986 }; 987 988 static const struct power_supply_desc ab8500_btemp_desc = { 989 .name = "ab8500_btemp", 990 .type = POWER_SUPPLY_TYPE_BATTERY, 991 .properties = ab8500_btemp_props, 992 .num_properties = ARRAY_SIZE(ab8500_btemp_props), 993 .get_property = ab8500_btemp_get_property, 994 .external_power_changed = ab8500_btemp_external_power_changed, 995 }; 996 997 static int ab8500_btemp_probe(struct platform_device *pdev) 998 { 999 struct device_node *np = pdev->dev.of_node; 1000 struct abx500_bm_data *plat = pdev->dev.platform_data; 1001 struct power_supply_config psy_cfg = {}; 1002 struct ab8500_btemp *di; 1003 int irq, i, ret = 0; 1004 u8 val; 1005 1006 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL); 1007 if (!di) { 1008 dev_err(&pdev->dev, "%s no mem for ab8500_btemp\n", __func__); 1009 return -ENOMEM; 1010 } 1011 1012 if (!plat) { 1013 dev_err(&pdev->dev, "no battery management data supplied\n"); 1014 return -EINVAL; 1015 } 1016 di->bm = plat; 1017 1018 if (np) { 1019 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm); 1020 if (ret) { 1021 dev_err(&pdev->dev, "failed to get battery information\n"); 1022 return ret; 1023 } 1024 } 1025 1026 /* get parent data */ 1027 di->dev = &pdev->dev; 1028 di->parent = dev_get_drvdata(pdev->dev.parent); 1029 1030 /* Get ADC channels */ 1031 di->btemp_ball = devm_iio_channel_get(&pdev->dev, "btemp_ball"); 1032 if (IS_ERR(di->btemp_ball)) { 1033 if (PTR_ERR(di->btemp_ball) == -ENODEV) 1034 return -EPROBE_DEFER; 1035 dev_err(&pdev->dev, "failed to get BTEMP BALL ADC channel\n"); 1036 return PTR_ERR(di->btemp_ball); 1037 } 1038 di->bat_ctrl = devm_iio_channel_get(&pdev->dev, "bat_ctrl"); 1039 if (IS_ERR(di->bat_ctrl)) { 1040 if (PTR_ERR(di->bat_ctrl) == -ENODEV) 1041 return -EPROBE_DEFER; 1042 dev_err(&pdev->dev, "failed to get BAT CTRL ADC channel\n"); 1043 return PTR_ERR(di->bat_ctrl); 1044 } 1045 1046 di->initialized = false; 1047 1048 psy_cfg.supplied_to = supply_interface; 1049 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface); 1050 psy_cfg.drv_data = di; 1051 1052 /* Create a work queue for the btemp */ 1053 di->btemp_wq = 1054 alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM, 0); 1055 if (di->btemp_wq == NULL) { 1056 dev_err(di->dev, "failed to create work queue\n"); 1057 return -ENOMEM; 1058 } 1059 1060 /* Init work for measuring temperature periodically */ 1061 INIT_DEFERRABLE_WORK(&di->btemp_periodic_work, 1062 ab8500_btemp_periodic_work); 1063 1064 /* Set BTEMP thermal limits. Low and Med are fixed */ 1065 di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT; 1066 di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT; 1067 1068 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER, 1069 AB8500_BTEMP_HIGH_TH, &val); 1070 if (ret < 0) { 1071 dev_err(di->dev, "%s ab8500 read failed\n", __func__); 1072 goto free_btemp_wq; 1073 } 1074 switch (val) { 1075 case BTEMP_HIGH_TH_57_0: 1076 case BTEMP_HIGH_TH_57_1: 1077 di->btemp_ranges.btemp_high_limit = 1078 BTEMP_THERMAL_HIGH_LIMIT_57; 1079 break; 1080 case BTEMP_HIGH_TH_52: 1081 di->btemp_ranges.btemp_high_limit = 1082 BTEMP_THERMAL_HIGH_LIMIT_52; 1083 break; 1084 case BTEMP_HIGH_TH_62: 1085 di->btemp_ranges.btemp_high_limit = 1086 BTEMP_THERMAL_HIGH_LIMIT_62; 1087 break; 1088 } 1089 1090 /* Register BTEMP power supply class */ 1091 di->btemp_psy = power_supply_register(di->dev, &ab8500_btemp_desc, 1092 &psy_cfg); 1093 if (IS_ERR(di->btemp_psy)) { 1094 dev_err(di->dev, "failed to register BTEMP psy\n"); 1095 ret = PTR_ERR(di->btemp_psy); 1096 goto free_btemp_wq; 1097 } 1098 1099 /* Register interrupts */ 1100 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) { 1101 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name); 1102 if (irq < 0) { 1103 ret = irq; 1104 goto free_irq; 1105 } 1106 1107 ret = request_threaded_irq(irq, NULL, ab8500_btemp_irq[i].isr, 1108 IRQF_SHARED | IRQF_NO_SUSPEND, 1109 ab8500_btemp_irq[i].name, di); 1110 1111 if (ret) { 1112 dev_err(di->dev, "failed to request %s IRQ %d: %d\n" 1113 , ab8500_btemp_irq[i].name, irq, ret); 1114 goto free_irq; 1115 } 1116 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n", 1117 ab8500_btemp_irq[i].name, irq, ret); 1118 } 1119 1120 platform_set_drvdata(pdev, di); 1121 1122 /* Kick off periodic temperature measurements */ 1123 ab8500_btemp_periodic(di, true); 1124 list_add_tail(&di->node, &ab8500_btemp_list); 1125 1126 return ret; 1127 1128 free_irq: 1129 /* We also have to free all successfully registered irqs */ 1130 for (i = i - 1; i >= 0; i--) { 1131 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name); 1132 free_irq(irq, di); 1133 } 1134 1135 power_supply_unregister(di->btemp_psy); 1136 free_btemp_wq: 1137 destroy_workqueue(di->btemp_wq); 1138 return ret; 1139 } 1140 1141 static const struct of_device_id ab8500_btemp_match[] = { 1142 { .compatible = "stericsson,ab8500-btemp", }, 1143 { }, 1144 }; 1145 1146 static struct platform_driver ab8500_btemp_driver = { 1147 .probe = ab8500_btemp_probe, 1148 .remove = ab8500_btemp_remove, 1149 .suspend = ab8500_btemp_suspend, 1150 .resume = ab8500_btemp_resume, 1151 .driver = { 1152 .name = "ab8500-btemp", 1153 .of_match_table = ab8500_btemp_match, 1154 }, 1155 }; 1156 1157 static int __init ab8500_btemp_init(void) 1158 { 1159 return platform_driver_register(&ab8500_btemp_driver); 1160 } 1161 1162 static void __exit ab8500_btemp_exit(void) 1163 { 1164 platform_driver_unregister(&ab8500_btemp_driver); 1165 } 1166 1167 device_initcall(ab8500_btemp_init); 1168 module_exit(ab8500_btemp_exit); 1169 1170 MODULE_LICENSE("GPL v2"); 1171 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy"); 1172 MODULE_ALIAS("platform:ab8500-btemp"); 1173 MODULE_DESCRIPTION("AB8500 battery temperature driver"); 1174