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 /** 49 * struct ab8500_btemp_interrupts - ab8500 interrupts 50 * @name: name of the interrupt 51 * @isr function pointer to the isr 52 */ 53 struct ab8500_btemp_interrupts { 54 char *name; 55 irqreturn_t (*isr)(int irq, void *data); 56 }; 57 58 struct ab8500_btemp_events { 59 bool batt_rem; 60 bool btemp_high; 61 bool btemp_medhigh; 62 bool btemp_lowmed; 63 bool btemp_low; 64 bool ac_conn; 65 bool usb_conn; 66 }; 67 68 struct ab8500_btemp_ranges { 69 int btemp_high_limit; 70 int btemp_med_limit; 71 int btemp_low_limit; 72 }; 73 74 /** 75 * struct ab8500_btemp - ab8500 BTEMP device information 76 * @dev: Pointer to the structure device 77 * @node: List of AB8500 BTEMPs, hence prepared for reentrance 78 * @curr_source: What current source we use, in uA 79 * @bat_temp: Dispatched battery temperature in degree Celsius 80 * @prev_bat_temp Last measured battery temperature in degree Celsius 81 * @parent: Pointer to the struct ab8500 82 * @gpadc: Pointer to the struct gpadc 83 * @fg: Pointer to the struct fg 84 * @bm: Platform specific battery management information 85 * @btemp_psy: Structure for BTEMP specific battery properties 86 * @events: Structure for information about events triggered 87 * @btemp_ranges: Battery temperature range structure 88 * @btemp_wq: Work queue for measuring the temperature periodically 89 * @btemp_periodic_work: Work for measuring the temperature periodically 90 * @initialized: True if battery id read. 91 */ 92 struct ab8500_btemp { 93 struct device *dev; 94 struct list_head node; 95 int curr_source; 96 int bat_temp; 97 int prev_bat_temp; 98 struct ab8500 *parent; 99 struct ab8500_gpadc *gpadc; 100 struct ab8500_fg *fg; 101 struct abx500_bm_data *bm; 102 struct power_supply *btemp_psy; 103 struct ab8500_btemp_events events; 104 struct ab8500_btemp_ranges btemp_ranges; 105 struct workqueue_struct *btemp_wq; 106 struct delayed_work btemp_periodic_work; 107 bool initialized; 108 }; 109 110 /* BTEMP power supply properties */ 111 static enum power_supply_property ab8500_btemp_props[] = { 112 POWER_SUPPLY_PROP_PRESENT, 113 POWER_SUPPLY_PROP_ONLINE, 114 POWER_SUPPLY_PROP_TECHNOLOGY, 115 POWER_SUPPLY_PROP_TEMP, 116 }; 117 118 static LIST_HEAD(ab8500_btemp_list); 119 120 /** 121 * ab8500_btemp_get() - returns a reference to the primary AB8500 BTEMP 122 * (i.e. the first BTEMP in the instance list) 123 */ 124 struct ab8500_btemp *ab8500_btemp_get(void) 125 { 126 return list_first_entry(&ab8500_btemp_list, struct ab8500_btemp, node); 127 } 128 EXPORT_SYMBOL(ab8500_btemp_get); 129 130 /** 131 * ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance 132 * @di: pointer to the ab8500_btemp structure 133 * @v_batctrl: measured batctrl voltage 134 * @inst_curr: measured instant current 135 * 136 * This function returns the battery resistance that is 137 * derived from the BATCTRL voltage. 138 * Returns value in Ohms. 139 */ 140 static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di, 141 int v_batctrl, int inst_curr) 142 { 143 int rbs; 144 145 if (is_ab8500_1p1_or_earlier(di->parent)) { 146 /* 147 * For ABB cut1.0 and 1.1 BAT_CTRL is internally 148 * connected to 1.8V through a 450k resistor 149 */ 150 return (450000 * (v_batctrl)) / (1800 - v_batctrl); 151 } 152 153 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL) { 154 /* 155 * If the battery has internal NTC, we use the current 156 * source to calculate the resistance. 157 */ 158 rbs = (v_batctrl * 1000 159 - di->bm->gnd_lift_resistance * inst_curr) 160 / di->curr_source; 161 } else { 162 /* 163 * BAT_CTRL is internally 164 * connected to 1.8V through a 80k resistor 165 */ 166 rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl); 167 } 168 169 return rbs; 170 } 171 172 /** 173 * ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage 174 * @di: pointer to the ab8500_btemp structure 175 * 176 * This function returns the voltage on BATCTRL. Returns value in mV. 177 */ 178 static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di) 179 { 180 int vbtemp; 181 static int prev; 182 183 vbtemp = ab8500_gpadc_convert(di->gpadc, BAT_CTRL); 184 if (vbtemp < 0) { 185 dev_err(di->dev, 186 "%s gpadc conversion failed, using previous value", 187 __func__); 188 return prev; 189 } 190 prev = vbtemp; 191 return vbtemp; 192 } 193 194 /** 195 * ab8500_btemp_curr_source_enable() - enable/disable batctrl current source 196 * @di: pointer to the ab8500_btemp structure 197 * @enable: enable or disable the current source 198 * 199 * Enable or disable the current sources for the BatCtrl AD channel 200 */ 201 static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di, 202 bool enable) 203 { 204 int curr; 205 int ret = 0; 206 207 /* 208 * BATCTRL current sources are included on AB8500 cut2.0 209 * and future versions 210 */ 211 if (is_ab8500_1p1_or_earlier(di->parent)) 212 return 0; 213 214 /* Only do this for batteries with internal NTC */ 215 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) { 216 217 if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA) 218 curr = BAT_CTRL_7U_ENA; 219 else 220 curr = BAT_CTRL_20U_ENA; 221 222 dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source); 223 224 ret = abx500_mask_and_set_register_interruptible(di->dev, 225 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 226 FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH); 227 if (ret) { 228 dev_err(di->dev, "%s failed setting cmp_force\n", 229 __func__); 230 return ret; 231 } 232 233 /* 234 * We have to wait one 32kHz cycle before enabling 235 * the current source, since ForceBatCtrlCmpHigh needs 236 * to be written in a separate cycle 237 */ 238 udelay(32); 239 240 ret = abx500_set_register_interruptible(di->dev, 241 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 242 FORCE_BAT_CTRL_CMP_HIGH | curr); 243 if (ret) { 244 dev_err(di->dev, "%s failed enabling current source\n", 245 __func__); 246 goto disable_curr_source; 247 } 248 } else if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) { 249 dev_dbg(di->dev, "Disable BATCTRL curr source\n"); 250 251 /* Write 0 to the curr bits */ 252 ret = abx500_mask_and_set_register_interruptible( 253 di->dev, 254 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 255 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA, 256 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA)); 257 258 if (ret) { 259 dev_err(di->dev, "%s failed disabling current source\n", 260 __func__); 261 goto disable_curr_source; 262 } 263 264 /* Enable Pull-Up and comparator */ 265 ret = abx500_mask_and_set_register_interruptible(di->dev, 266 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 267 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA, 268 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA); 269 if (ret) { 270 dev_err(di->dev, "%s failed enabling PU and comp\n", 271 __func__); 272 goto enable_pu_comp; 273 } 274 275 /* 276 * We have to wait one 32kHz cycle before disabling 277 * ForceBatCtrlCmpHigh since this needs to be written 278 * in a separate cycle 279 */ 280 udelay(32); 281 282 /* Disable 'force comparator' */ 283 ret = abx500_mask_and_set_register_interruptible(di->dev, 284 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 285 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH); 286 if (ret) { 287 dev_err(di->dev, "%s failed disabling force comp\n", 288 __func__); 289 goto disable_force_comp; 290 } 291 } 292 return ret; 293 294 /* 295 * We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time 296 * if we got an error above 297 */ 298 disable_curr_source: 299 /* Write 0 to the curr bits */ 300 ret = abx500_mask_and_set_register_interruptible(di->dev, 301 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 302 BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA, 303 ~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA)); 304 305 if (ret) { 306 dev_err(di->dev, "%s failed disabling current source\n", 307 __func__); 308 return ret; 309 } 310 enable_pu_comp: 311 /* Enable Pull-Up and comparator */ 312 ret = abx500_mask_and_set_register_interruptible(di->dev, 313 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 314 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA, 315 BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA); 316 if (ret) { 317 dev_err(di->dev, "%s failed enabling PU and comp\n", 318 __func__); 319 return ret; 320 } 321 322 disable_force_comp: 323 /* 324 * We have to wait one 32kHz cycle before disabling 325 * ForceBatCtrlCmpHigh since this needs to be written 326 * in a separate cycle 327 */ 328 udelay(32); 329 330 /* Disable 'force comparator' */ 331 ret = abx500_mask_and_set_register_interruptible(di->dev, 332 AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, 333 FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH); 334 if (ret) { 335 dev_err(di->dev, "%s failed disabling force comp\n", 336 __func__); 337 return ret; 338 } 339 340 return ret; 341 } 342 343 /** 344 * ab8500_btemp_get_batctrl_res() - get battery resistance 345 * @di: pointer to the ab8500_btemp structure 346 * 347 * This function returns the battery pack identification resistance. 348 * Returns value in Ohms. 349 */ 350 static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di) 351 { 352 int ret; 353 int batctrl = 0; 354 int res; 355 int inst_curr; 356 int i; 357 358 /* 359 * BATCTRL current sources are included on AB8500 cut2.0 360 * and future versions 361 */ 362 ret = ab8500_btemp_curr_source_enable(di, true); 363 if (ret) { 364 dev_err(di->dev, "%s curr source enabled failed\n", __func__); 365 return ret; 366 } 367 368 if (!di->fg) 369 di->fg = ab8500_fg_get(); 370 if (!di->fg) { 371 dev_err(di->dev, "No fg found\n"); 372 return -EINVAL; 373 } 374 375 ret = ab8500_fg_inst_curr_start(di->fg); 376 377 if (ret) { 378 dev_err(di->dev, "Failed to start current measurement\n"); 379 return ret; 380 } 381 382 do { 383 msleep(20); 384 } while (!ab8500_fg_inst_curr_started(di->fg)); 385 386 i = 0; 387 388 do { 389 batctrl += ab8500_btemp_read_batctrl_voltage(di); 390 i++; 391 msleep(20); 392 } while (!ab8500_fg_inst_curr_done(di->fg)); 393 batctrl /= i; 394 395 ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr); 396 if (ret) { 397 dev_err(di->dev, "Failed to finalize current measurement\n"); 398 return ret; 399 } 400 401 res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr); 402 403 ret = ab8500_btemp_curr_source_enable(di, false); 404 if (ret) { 405 dev_err(di->dev, "%s curr source disable failed\n", __func__); 406 return ret; 407 } 408 409 dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n", 410 __func__, batctrl, res, inst_curr, i); 411 412 return res; 413 } 414 415 /** 416 * ab8500_btemp_res_to_temp() - resistance to temperature 417 * @di: pointer to the ab8500_btemp structure 418 * @tbl: pointer to the resiatance to temperature table 419 * @tbl_size: size of the resistance to temperature table 420 * @res: resistance to calculate the temperature from 421 * 422 * This function returns the battery temperature in degrees Celsius 423 * based on the NTC resistance. 424 */ 425 static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di, 426 const struct abx500_res_to_temp *tbl, int tbl_size, int res) 427 { 428 int i; 429 /* 430 * Calculate the formula for the straight line 431 * Simple interpolation if we are within 432 * the resistance table limits, extrapolate 433 * if resistance is outside the limits. 434 */ 435 if (res > tbl[0].resist) 436 i = 0; 437 else if (res <= tbl[tbl_size - 1].resist) 438 i = tbl_size - 2; 439 else { 440 i = 0; 441 while (!(res <= tbl[i].resist && 442 res > tbl[i + 1].resist)) 443 i++; 444 } 445 446 return tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) * 447 (res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist); 448 } 449 450 /** 451 * ab8500_btemp_measure_temp() - measure battery temperature 452 * @di: pointer to the ab8500_btemp structure 453 * 454 * Returns battery temperature (on success) else the previous temperature 455 */ 456 static int ab8500_btemp_measure_temp(struct ab8500_btemp *di) 457 { 458 int temp; 459 static int prev; 460 int rbat, rntc, vntc; 461 u8 id; 462 463 id = di->bm->batt_id; 464 465 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && 466 id != BATTERY_UNKNOWN) { 467 468 rbat = ab8500_btemp_get_batctrl_res(di); 469 if (rbat < 0) { 470 dev_err(di->dev, "%s get batctrl res failed\n", 471 __func__); 472 /* 473 * Return out-of-range temperature so that 474 * charging is stopped 475 */ 476 return BTEMP_THERMAL_LOW_LIMIT; 477 } 478 479 temp = ab8500_btemp_res_to_temp(di, 480 di->bm->bat_type[id].r_to_t_tbl, 481 di->bm->bat_type[id].n_temp_tbl_elements, rbat); 482 } else { 483 vntc = ab8500_gpadc_convert(di->gpadc, BTEMP_BALL); 484 if (vntc < 0) { 485 dev_err(di->dev, 486 "%s gpadc conversion failed," 487 " using previous value\n", __func__); 488 return prev; 489 } 490 /* 491 * The PCB NTC is sourced from VTVOUT via a 230kOhm 492 * resistor. 493 */ 494 rntc = 230000 * vntc / (VTVOUT_V - vntc); 495 496 temp = ab8500_btemp_res_to_temp(di, 497 di->bm->bat_type[id].r_to_t_tbl, 498 di->bm->bat_type[id].n_temp_tbl_elements, rntc); 499 prev = temp; 500 } 501 dev_dbg(di->dev, "Battery temperature is %d\n", temp); 502 return temp; 503 } 504 505 /** 506 * ab8500_btemp_id() - Identify the connected battery 507 * @di: pointer to the ab8500_btemp structure 508 * 509 * This function will try to identify the battery by reading the ID 510 * resistor. Some brands use a combined ID resistor with a NTC resistor to 511 * both be able to identify and to read the temperature of it. 512 */ 513 static int ab8500_btemp_id(struct ab8500_btemp *di) 514 { 515 int res; 516 u8 i; 517 518 di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA; 519 di->bm->batt_id = BATTERY_UNKNOWN; 520 521 res = ab8500_btemp_get_batctrl_res(di); 522 if (res < 0) { 523 dev_err(di->dev, "%s get batctrl res failed\n", __func__); 524 return -ENXIO; 525 } 526 527 /* BATTERY_UNKNOWN is defined on position 0, skip it! */ 528 for (i = BATTERY_UNKNOWN + 1; i < di->bm->n_btypes; i++) { 529 if ((res <= di->bm->bat_type[i].resis_high) && 530 (res >= di->bm->bat_type[i].resis_low)) { 531 dev_dbg(di->dev, "Battery detected on %s" 532 " low %d < res %d < high: %d" 533 " index: %d\n", 534 di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL ? 535 "BATCTRL" : "BATTEMP", 536 di->bm->bat_type[i].resis_low, res, 537 di->bm->bat_type[i].resis_high, i); 538 539 di->bm->batt_id = i; 540 break; 541 } 542 } 543 544 if (di->bm->batt_id == BATTERY_UNKNOWN) { 545 dev_warn(di->dev, "Battery identified as unknown" 546 ", resistance %d Ohm\n", res); 547 return -ENXIO; 548 } 549 550 /* 551 * We only have to change current source if the 552 * detected type is Type 1. 553 */ 554 if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && 555 di->bm->batt_id == 1) { 556 dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n"); 557 di->curr_source = BTEMP_BATCTRL_CURR_SRC_20UA; 558 } 559 560 return di->bm->batt_id; 561 } 562 563 /** 564 * ab8500_btemp_periodic_work() - Measuring the temperature periodically 565 * @work: pointer to the work_struct structure 566 * 567 * Work function for measuring the temperature periodically 568 */ 569 static void ab8500_btemp_periodic_work(struct work_struct *work) 570 { 571 int interval; 572 int bat_temp; 573 struct ab8500_btemp *di = container_of(work, 574 struct ab8500_btemp, btemp_periodic_work.work); 575 576 if (!di->initialized) { 577 /* Identify the battery */ 578 if (ab8500_btemp_id(di) < 0) 579 dev_warn(di->dev, "failed to identify the battery\n"); 580 } 581 582 bat_temp = ab8500_btemp_measure_temp(di); 583 /* 584 * Filter battery temperature. 585 * Allow direct updates on temperature only if two samples result in 586 * same temperature. Else only allow 1 degree change from previous 587 * reported value in the direction of the new measurement. 588 */ 589 if ((bat_temp == di->prev_bat_temp) || !di->initialized) { 590 if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) { 591 di->initialized = true; 592 di->bat_temp = bat_temp; 593 power_supply_changed(di->btemp_psy); 594 } 595 } else if (bat_temp < di->prev_bat_temp) { 596 di->bat_temp--; 597 power_supply_changed(di->btemp_psy); 598 } else if (bat_temp > di->prev_bat_temp) { 599 di->bat_temp++; 600 power_supply_changed(di->btemp_psy); 601 } 602 di->prev_bat_temp = bat_temp; 603 604 if (di->events.ac_conn || di->events.usb_conn) 605 interval = di->bm->temp_interval_chg; 606 else 607 interval = di->bm->temp_interval_nochg; 608 609 /* Schedule a new measurement */ 610 queue_delayed_work(di->btemp_wq, 611 &di->btemp_periodic_work, 612 round_jiffies(interval * HZ)); 613 } 614 615 /** 616 * ab8500_btemp_batctrlindb_handler() - battery removal detected 617 * @irq: interrupt number 618 * @_di: void pointer that has to address of ab8500_btemp 619 * 620 * Returns IRQ status(IRQ_HANDLED) 621 */ 622 static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di) 623 { 624 struct ab8500_btemp *di = _di; 625 dev_err(di->dev, "Battery removal detected!\n"); 626 627 di->events.batt_rem = true; 628 power_supply_changed(di->btemp_psy); 629 630 return IRQ_HANDLED; 631 } 632 633 /** 634 * ab8500_btemp_templow_handler() - battery temp lower than 10 degrees 635 * @irq: interrupt number 636 * @_di: void pointer that has to address of ab8500_btemp 637 * 638 * Returns IRQ status(IRQ_HANDLED) 639 */ 640 static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di) 641 { 642 struct ab8500_btemp *di = _di; 643 644 if (is_ab8500_3p3_or_earlier(di->parent)) { 645 dev_dbg(di->dev, "Ignore false btemp low irq" 646 " for ABB cut 1.0, 1.1, 2.0 and 3.3\n"); 647 } else { 648 dev_crit(di->dev, "Battery temperature lower than -10deg c\n"); 649 650 di->events.btemp_low = true; 651 di->events.btemp_high = false; 652 di->events.btemp_medhigh = false; 653 di->events.btemp_lowmed = false; 654 power_supply_changed(di->btemp_psy); 655 } 656 657 return IRQ_HANDLED; 658 } 659 660 /** 661 * ab8500_btemp_temphigh_handler() - battery temp higher than max temp 662 * @irq: interrupt number 663 * @_di: void pointer that has to address of ab8500_btemp 664 * 665 * Returns IRQ status(IRQ_HANDLED) 666 */ 667 static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di) 668 { 669 struct ab8500_btemp *di = _di; 670 671 dev_crit(di->dev, "Battery temperature is higher than MAX temp\n"); 672 673 di->events.btemp_high = true; 674 di->events.btemp_medhigh = false; 675 di->events.btemp_lowmed = false; 676 di->events.btemp_low = false; 677 power_supply_changed(di->btemp_psy); 678 679 return IRQ_HANDLED; 680 } 681 682 /** 683 * ab8500_btemp_lowmed_handler() - battery temp between low and medium 684 * @irq: interrupt number 685 * @_di: void pointer that has to address of ab8500_btemp 686 * 687 * Returns IRQ status(IRQ_HANDLED) 688 */ 689 static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di) 690 { 691 struct ab8500_btemp *di = _di; 692 693 dev_dbg(di->dev, "Battery temperature is between low and medium\n"); 694 695 di->events.btemp_lowmed = true; 696 di->events.btemp_medhigh = false; 697 di->events.btemp_high = false; 698 di->events.btemp_low = false; 699 power_supply_changed(di->btemp_psy); 700 701 return IRQ_HANDLED; 702 } 703 704 /** 705 * ab8500_btemp_medhigh_handler() - battery temp between medium and high 706 * @irq: interrupt number 707 * @_di: void pointer that has to address of ab8500_btemp 708 * 709 * Returns IRQ status(IRQ_HANDLED) 710 */ 711 static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di) 712 { 713 struct ab8500_btemp *di = _di; 714 715 dev_dbg(di->dev, "Battery temperature is between medium and high\n"); 716 717 di->events.btemp_medhigh = true; 718 di->events.btemp_lowmed = false; 719 di->events.btemp_high = false; 720 di->events.btemp_low = false; 721 power_supply_changed(di->btemp_psy); 722 723 return IRQ_HANDLED; 724 } 725 726 /** 727 * ab8500_btemp_periodic() - Periodic temperature measurements 728 * @di: pointer to the ab8500_btemp structure 729 * @enable: enable or disable periodic temperature measurements 730 * 731 * Starts of stops periodic temperature measurements. Periodic measurements 732 * should only be done when a charger is connected. 733 */ 734 static void ab8500_btemp_periodic(struct ab8500_btemp *di, 735 bool enable) 736 { 737 dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n", 738 enable); 739 /* 740 * Make sure a new measurement is done directly by cancelling 741 * any pending work 742 */ 743 cancel_delayed_work_sync(&di->btemp_periodic_work); 744 745 if (enable) 746 queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0); 747 } 748 749 /** 750 * ab8500_btemp_get_temp() - get battery temperature 751 * @di: pointer to the ab8500_btemp structure 752 * 753 * Returns battery temperature 754 */ 755 int ab8500_btemp_get_temp(struct ab8500_btemp *di) 756 { 757 int temp = 0; 758 759 /* 760 * The BTEMP events are not reliabe on AB8500 cut3.3 761 * and prior versions 762 */ 763 if (is_ab8500_3p3_or_earlier(di->parent)) { 764 temp = di->bat_temp * 10; 765 } else { 766 if (di->events.btemp_low) { 767 if (temp > di->btemp_ranges.btemp_low_limit) 768 temp = di->btemp_ranges.btemp_low_limit * 10; 769 else 770 temp = di->bat_temp * 10; 771 } else if (di->events.btemp_high) { 772 if (temp < di->btemp_ranges.btemp_high_limit) 773 temp = di->btemp_ranges.btemp_high_limit * 10; 774 else 775 temp = di->bat_temp * 10; 776 } else if (di->events.btemp_lowmed) { 777 if (temp > di->btemp_ranges.btemp_med_limit) 778 temp = di->btemp_ranges.btemp_med_limit * 10; 779 else 780 temp = di->bat_temp * 10; 781 } else if (di->events.btemp_medhigh) { 782 if (temp < di->btemp_ranges.btemp_med_limit) 783 temp = di->btemp_ranges.btemp_med_limit * 10; 784 else 785 temp = di->bat_temp * 10; 786 } else 787 temp = di->bat_temp * 10; 788 } 789 return temp; 790 } 791 EXPORT_SYMBOL(ab8500_btemp_get_temp); 792 793 /** 794 * ab8500_btemp_get_batctrl_temp() - get the temperature 795 * @btemp: pointer to the btemp structure 796 * 797 * Returns the batctrl temperature in millidegrees 798 */ 799 int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp *btemp) 800 { 801 return btemp->bat_temp * 1000; 802 } 803 EXPORT_SYMBOL(ab8500_btemp_get_batctrl_temp); 804 805 /** 806 * ab8500_btemp_get_property() - get the btemp properties 807 * @psy: pointer to the power_supply structure 808 * @psp: pointer to the power_supply_property structure 809 * @val: pointer to the power_supply_propval union 810 * 811 * This function gets called when an application tries to get the btemp 812 * properties by reading the sysfs files. 813 * online: presence of the battery 814 * present: presence of the battery 815 * technology: battery technology 816 * temp: battery temperature 817 * Returns error code in case of failure else 0(on success) 818 */ 819 static int ab8500_btemp_get_property(struct power_supply *psy, 820 enum power_supply_property psp, 821 union power_supply_propval *val) 822 { 823 struct ab8500_btemp *di = power_supply_get_drvdata(psy); 824 825 switch (psp) { 826 case POWER_SUPPLY_PROP_PRESENT: 827 case POWER_SUPPLY_PROP_ONLINE: 828 if (di->events.batt_rem) 829 val->intval = 0; 830 else 831 val->intval = 1; 832 break; 833 case POWER_SUPPLY_PROP_TECHNOLOGY: 834 val->intval = di->bm->bat_type[di->bm->batt_id].name; 835 break; 836 case POWER_SUPPLY_PROP_TEMP: 837 val->intval = ab8500_btemp_get_temp(di); 838 break; 839 default: 840 return -EINVAL; 841 } 842 return 0; 843 } 844 845 static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data) 846 { 847 struct power_supply *psy; 848 struct power_supply *ext = dev_get_drvdata(dev); 849 const char **supplicants = (const char **)ext->supplied_to; 850 struct ab8500_btemp *di; 851 union power_supply_propval ret; 852 int j; 853 854 psy = (struct power_supply *)data; 855 di = power_supply_get_drvdata(psy); 856 857 /* 858 * For all psy where the name of your driver 859 * appears in any supplied_to 860 */ 861 j = match_string(supplicants, ext->num_supplicants, psy->desc->name); 862 if (j < 0) 863 return 0; 864 865 /* Go through all properties for the psy */ 866 for (j = 0; j < ext->desc->num_properties; j++) { 867 enum power_supply_property prop; 868 prop = ext->desc->properties[j]; 869 870 if (power_supply_get_property(ext, prop, &ret)) 871 continue; 872 873 switch (prop) { 874 case POWER_SUPPLY_PROP_PRESENT: 875 switch (ext->desc->type) { 876 case POWER_SUPPLY_TYPE_MAINS: 877 /* AC disconnected */ 878 if (!ret.intval && di->events.ac_conn) { 879 di->events.ac_conn = false; 880 } 881 /* AC connected */ 882 else if (ret.intval && !di->events.ac_conn) { 883 di->events.ac_conn = true; 884 if (!di->events.usb_conn) 885 ab8500_btemp_periodic(di, true); 886 } 887 break; 888 case POWER_SUPPLY_TYPE_USB: 889 /* USB disconnected */ 890 if (!ret.intval && di->events.usb_conn) { 891 di->events.usb_conn = false; 892 } 893 /* USB connected */ 894 else if (ret.intval && !di->events.usb_conn) { 895 di->events.usb_conn = true; 896 if (!di->events.ac_conn) 897 ab8500_btemp_periodic(di, true); 898 } 899 break; 900 default: 901 break; 902 } 903 break; 904 default: 905 break; 906 } 907 } 908 return 0; 909 } 910 911 /** 912 * ab8500_btemp_external_power_changed() - callback for power supply changes 913 * @psy: pointer to the structure power_supply 914 * 915 * This function is pointing to the function pointer external_power_changed 916 * of the structure power_supply. 917 * This function gets executed when there is a change in the external power 918 * supply to the btemp. 919 */ 920 static void ab8500_btemp_external_power_changed(struct power_supply *psy) 921 { 922 struct ab8500_btemp *di = power_supply_get_drvdata(psy); 923 924 class_for_each_device(power_supply_class, NULL, 925 di->btemp_psy, ab8500_btemp_get_ext_psy_data); 926 } 927 928 /* ab8500 btemp driver interrupts and their respective isr */ 929 static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = { 930 {"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler}, 931 {"BTEMP_LOW", ab8500_btemp_templow_handler}, 932 {"BTEMP_HIGH", ab8500_btemp_temphigh_handler}, 933 {"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler}, 934 {"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler}, 935 }; 936 937 #if defined(CONFIG_PM) 938 static int ab8500_btemp_resume(struct platform_device *pdev) 939 { 940 struct ab8500_btemp *di = platform_get_drvdata(pdev); 941 942 ab8500_btemp_periodic(di, true); 943 944 return 0; 945 } 946 947 static int ab8500_btemp_suspend(struct platform_device *pdev, 948 pm_message_t state) 949 { 950 struct ab8500_btemp *di = platform_get_drvdata(pdev); 951 952 ab8500_btemp_periodic(di, false); 953 954 return 0; 955 } 956 #else 957 #define ab8500_btemp_suspend NULL 958 #define ab8500_btemp_resume NULL 959 #endif 960 961 static int ab8500_btemp_remove(struct platform_device *pdev) 962 { 963 struct ab8500_btemp *di = platform_get_drvdata(pdev); 964 int i, irq; 965 966 /* Disable interrupts */ 967 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) { 968 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name); 969 free_irq(irq, di); 970 } 971 972 /* Delete the work queue */ 973 destroy_workqueue(di->btemp_wq); 974 975 flush_scheduled_work(); 976 power_supply_unregister(di->btemp_psy); 977 978 return 0; 979 } 980 981 static char *supply_interface[] = { 982 "ab8500_chargalg", 983 "ab8500_fg", 984 }; 985 986 static const struct power_supply_desc ab8500_btemp_desc = { 987 .name = "ab8500_btemp", 988 .type = POWER_SUPPLY_TYPE_BATTERY, 989 .properties = ab8500_btemp_props, 990 .num_properties = ARRAY_SIZE(ab8500_btemp_props), 991 .get_property = ab8500_btemp_get_property, 992 .external_power_changed = ab8500_btemp_external_power_changed, 993 }; 994 995 static int ab8500_btemp_probe(struct platform_device *pdev) 996 { 997 struct device_node *np = pdev->dev.of_node; 998 struct abx500_bm_data *plat = pdev->dev.platform_data; 999 struct power_supply_config psy_cfg = {}; 1000 struct ab8500_btemp *di; 1001 int irq, i, ret = 0; 1002 u8 val; 1003 1004 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL); 1005 if (!di) { 1006 dev_err(&pdev->dev, "%s no mem for ab8500_btemp\n", __func__); 1007 return -ENOMEM; 1008 } 1009 1010 if (!plat) { 1011 dev_err(&pdev->dev, "no battery management data supplied\n"); 1012 return -EINVAL; 1013 } 1014 di->bm = plat; 1015 1016 if (np) { 1017 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm); 1018 if (ret) { 1019 dev_err(&pdev->dev, "failed to get battery information\n"); 1020 return ret; 1021 } 1022 } 1023 1024 /* get parent data */ 1025 di->dev = &pdev->dev; 1026 di->parent = dev_get_drvdata(pdev->dev.parent); 1027 di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0"); 1028 1029 di->initialized = false; 1030 1031 psy_cfg.supplied_to = supply_interface; 1032 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface); 1033 psy_cfg.drv_data = di; 1034 1035 /* Create a work queue for the btemp */ 1036 di->btemp_wq = 1037 alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM, 0); 1038 if (di->btemp_wq == NULL) { 1039 dev_err(di->dev, "failed to create work queue\n"); 1040 return -ENOMEM; 1041 } 1042 1043 /* Init work for measuring temperature periodically */ 1044 INIT_DEFERRABLE_WORK(&di->btemp_periodic_work, 1045 ab8500_btemp_periodic_work); 1046 1047 /* Set BTEMP thermal limits. Low and Med are fixed */ 1048 di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT; 1049 di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT; 1050 1051 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER, 1052 AB8500_BTEMP_HIGH_TH, &val); 1053 if (ret < 0) { 1054 dev_err(di->dev, "%s ab8500 read failed\n", __func__); 1055 goto free_btemp_wq; 1056 } 1057 switch (val) { 1058 case BTEMP_HIGH_TH_57_0: 1059 case BTEMP_HIGH_TH_57_1: 1060 di->btemp_ranges.btemp_high_limit = 1061 BTEMP_THERMAL_HIGH_LIMIT_57; 1062 break; 1063 case BTEMP_HIGH_TH_52: 1064 di->btemp_ranges.btemp_high_limit = 1065 BTEMP_THERMAL_HIGH_LIMIT_52; 1066 break; 1067 case BTEMP_HIGH_TH_62: 1068 di->btemp_ranges.btemp_high_limit = 1069 BTEMP_THERMAL_HIGH_LIMIT_62; 1070 break; 1071 } 1072 1073 /* Register BTEMP power supply class */ 1074 di->btemp_psy = power_supply_register(di->dev, &ab8500_btemp_desc, 1075 &psy_cfg); 1076 if (IS_ERR(di->btemp_psy)) { 1077 dev_err(di->dev, "failed to register BTEMP psy\n"); 1078 ret = PTR_ERR(di->btemp_psy); 1079 goto free_btemp_wq; 1080 } 1081 1082 /* Register interrupts */ 1083 for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) { 1084 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name); 1085 ret = request_threaded_irq(irq, NULL, ab8500_btemp_irq[i].isr, 1086 IRQF_SHARED | IRQF_NO_SUSPEND, 1087 ab8500_btemp_irq[i].name, di); 1088 1089 if (ret) { 1090 dev_err(di->dev, "failed to request %s IRQ %d: %d\n" 1091 , ab8500_btemp_irq[i].name, irq, ret); 1092 goto free_irq; 1093 } 1094 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n", 1095 ab8500_btemp_irq[i].name, irq, ret); 1096 } 1097 1098 platform_set_drvdata(pdev, di); 1099 1100 /* Kick off periodic temperature measurements */ 1101 ab8500_btemp_periodic(di, true); 1102 list_add_tail(&di->node, &ab8500_btemp_list); 1103 1104 return ret; 1105 1106 free_irq: 1107 power_supply_unregister(di->btemp_psy); 1108 1109 /* We also have to free all successfully registered irqs */ 1110 for (i = i - 1; i >= 0; i--) { 1111 irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name); 1112 free_irq(irq, di); 1113 } 1114 free_btemp_wq: 1115 destroy_workqueue(di->btemp_wq); 1116 return ret; 1117 } 1118 1119 static const struct of_device_id ab8500_btemp_match[] = { 1120 { .compatible = "stericsson,ab8500-btemp", }, 1121 { }, 1122 }; 1123 1124 static struct platform_driver ab8500_btemp_driver = { 1125 .probe = ab8500_btemp_probe, 1126 .remove = ab8500_btemp_remove, 1127 .suspend = ab8500_btemp_suspend, 1128 .resume = ab8500_btemp_resume, 1129 .driver = { 1130 .name = "ab8500-btemp", 1131 .of_match_table = ab8500_btemp_match, 1132 }, 1133 }; 1134 1135 static int __init ab8500_btemp_init(void) 1136 { 1137 return platform_driver_register(&ab8500_btemp_driver); 1138 } 1139 1140 static void __exit ab8500_btemp_exit(void) 1141 { 1142 platform_driver_unregister(&ab8500_btemp_driver); 1143 } 1144 1145 device_initcall(ab8500_btemp_init); 1146 module_exit(ab8500_btemp_exit); 1147 1148 MODULE_LICENSE("GPL v2"); 1149 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy"); 1150 MODULE_ALIAS("platform:ab8500-btemp"); 1151 MODULE_DESCRIPTION("AB8500 battery temperature driver"); 1152