1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright (C) ST-Ericsson AB 2012 4 * 5 * Main and Back-up battery management driver. 6 * 7 * Note: Backup battery management is required in case of Li-Ion battery and not 8 * for capacitive battery. HREF boards have capacitive battery and hence backup 9 * battery management is not used and the supported code is available in this 10 * driver. 11 * 12 * Author: 13 * Johan Palsson <johan.palsson@stericsson.com> 14 * Karl Komierowski <karl.komierowski@stericsson.com> 15 * Arun R Murthy <arun.murthy@stericsson.com> 16 */ 17 18#include <linux/init.h> 19#include <linux/module.h> 20#include <linux/component.h> 21#include <linux/device.h> 22#include <linux/interrupt.h> 23#include <linux/platform_device.h> 24#include <linux/power_supply.h> 25#include <linux/kobject.h> 26#include <linux/slab.h> 27#include <linux/delay.h> 28#include <linux/time.h> 29#include <linux/time64.h> 30#include <linux/of.h> 31#include <linux/completion.h> 32#include <linux/mfd/core.h> 33#include <linux/mfd/abx500.h> 34#include <linux/mfd/abx500/ab8500.h> 35#include <linux/iio/consumer.h> 36#include <linux/kernel.h> 37#include <linux/fixp-arith.h> 38 39#include "ab8500-bm.h" 40 41#define FG_LSB_IN_MA 1627 42#define QLSB_NANO_AMP_HOURS_X10 1071 43#define INS_CURR_TIMEOUT (3 * HZ) 44 45#define SEC_TO_SAMPLE(S) (S * 4) 46 47#define NBR_AVG_SAMPLES 20 48#define WAIT_FOR_INST_CURRENT_MAX 70 49/* Currents higher than -500mA (dissipating) will make compensation unstable */ 50#define IGNORE_VBAT_HIGHCUR -500000 51 52#define LOW_BAT_CHECK_INTERVAL (HZ / 16) /* 62.5 ms */ 53 54#define VALID_CAPACITY_SEC (45 * 60) /* 45 minutes */ 55#define BATT_OK_MIN 2360 /* mV */ 56#define BATT_OK_INCREMENT 50 /* mV */ 57#define BATT_OK_MAX_NR_INCREMENTS 0xE 58 59/* FG constants */ 60#define BATT_OVV 0x01 61 62/** 63 * struct ab8500_fg_interrupts - ab8500 fg interrupts 64 * @name: name of the interrupt 65 * @isr function pointer to the isr 66 */ 67struct ab8500_fg_interrupts { 68 char *name; 69 irqreturn_t (*isr)(int irq, void *data); 70}; 71 72enum ab8500_fg_discharge_state { 73 AB8500_FG_DISCHARGE_INIT, 74 AB8500_FG_DISCHARGE_INITMEASURING, 75 AB8500_FG_DISCHARGE_INIT_RECOVERY, 76 AB8500_FG_DISCHARGE_RECOVERY, 77 AB8500_FG_DISCHARGE_READOUT_INIT, 78 AB8500_FG_DISCHARGE_READOUT, 79 AB8500_FG_DISCHARGE_WAKEUP, 80}; 81 82static char *discharge_state[] = { 83 "DISCHARGE_INIT", 84 "DISCHARGE_INITMEASURING", 85 "DISCHARGE_INIT_RECOVERY", 86 "DISCHARGE_RECOVERY", 87 "DISCHARGE_READOUT_INIT", 88 "DISCHARGE_READOUT", 89 "DISCHARGE_WAKEUP", 90}; 91 92enum ab8500_fg_charge_state { 93 AB8500_FG_CHARGE_INIT, 94 AB8500_FG_CHARGE_READOUT, 95}; 96 97static char *charge_state[] = { 98 "CHARGE_INIT", 99 "CHARGE_READOUT", 100}; 101 102enum ab8500_fg_calibration_state { 103 AB8500_FG_CALIB_INIT, 104 AB8500_FG_CALIB_WAIT, 105 AB8500_FG_CALIB_END, 106}; 107 108struct ab8500_fg_avg_cap { 109 int avg; 110 int samples[NBR_AVG_SAMPLES]; 111 time64_t time_stamps[NBR_AVG_SAMPLES]; 112 int pos; 113 int nbr_samples; 114 int sum; 115}; 116 117struct ab8500_fg_cap_scaling { 118 bool enable; 119 int cap_to_scale[2]; 120 int disable_cap_level; 121 int scaled_cap; 122}; 123 124struct ab8500_fg_battery_capacity { 125 int max_mah_design; 126 int max_mah; 127 int mah; 128 int permille; 129 int level; 130 int prev_mah; 131 int prev_percent; 132 int prev_level; 133 int user_mah; 134 struct ab8500_fg_cap_scaling cap_scale; 135}; 136 137struct ab8500_fg_flags { 138 bool fg_enabled; 139 bool conv_done; 140 bool charging; 141 bool fully_charged; 142 bool force_full; 143 bool low_bat_delay; 144 bool low_bat; 145 bool bat_ovv; 146 bool batt_unknown; 147 bool calibrate; 148 bool user_cap; 149 bool batt_id_received; 150}; 151 152struct inst_curr_result_list { 153 struct list_head list; 154 int *result; 155}; 156 157/** 158 * struct ab8500_fg - ab8500 FG device information 159 * @dev: Pointer to the structure device 160 * @node: a list of AB8500 FGs, hence prepared for reentrance 161 * @irq holds the CCEOC interrupt number 162 * @vbat_uv: Battery voltage in uV 163 * @vbat_nom_uv: Nominal battery voltage in uV 164 * @inst_curr_ua: Instantenous battery current in uA 165 * @avg_curr_ua: Average battery current in uA 166 * @bat_temp battery temperature 167 * @fg_samples: Number of samples used in the FG accumulation 168 * @accu_charge: Accumulated charge from the last conversion 169 * @recovery_cnt: Counter for recovery mode 170 * @high_curr_cnt: Counter for high current mode 171 * @init_cnt: Counter for init mode 172 * @low_bat_cnt Counter for number of consecutive low battery measures 173 * @nbr_cceoc_irq_cnt Counter for number of CCEOC irqs received since enabled 174 * @recovery_needed: Indicate if recovery is needed 175 * @high_curr_mode: Indicate if we're in high current mode 176 * @init_capacity: Indicate if initial capacity measuring should be done 177 * @turn_off_fg: True if fg was off before current measurement 178 * @calib_state State during offset calibration 179 * @discharge_state: Current discharge state 180 * @charge_state: Current charge state 181 * @ab8500_fg_started Completion struct used for the instant current start 182 * @ab8500_fg_complete Completion struct used for the instant current reading 183 * @flags: Structure for information about events triggered 184 * @bat_cap: Structure for battery capacity specific parameters 185 * @avg_cap: Average capacity filter 186 * @parent: Pointer to the struct ab8500 187 * @main_bat_v: ADC channel for the main battery voltage 188 * @bm: Platform specific battery management information 189 * @fg_psy: Structure that holds the FG specific battery properties 190 * @fg_wq: Work queue for running the FG algorithm 191 * @fg_periodic_work: Work to run the FG algorithm periodically 192 * @fg_low_bat_work: Work to check low bat condition 193 * @fg_reinit_work Work used to reset and reinitialise the FG algorithm 194 * @fg_work: Work to run the FG algorithm instantly 195 * @fg_acc_cur_work: Work to read the FG accumulator 196 * @fg_check_hw_failure_work: Work for checking HW state 197 * @cc_lock: Mutex for locking the CC 198 * @fg_kobject: Structure of type kobject 199 */ 200struct ab8500_fg { 201 struct device *dev; 202 struct list_head node; 203 int irq; 204 int vbat_uv; 205 int vbat_nom_uv; 206 int inst_curr_ua; 207 int avg_curr_ua; 208 int bat_temp; 209 int fg_samples; 210 int accu_charge; 211 int recovery_cnt; 212 int high_curr_cnt; 213 int init_cnt; 214 int low_bat_cnt; 215 int nbr_cceoc_irq_cnt; 216 u32 line_impedance_uohm; 217 bool recovery_needed; 218 bool high_curr_mode; 219 bool init_capacity; 220 bool turn_off_fg; 221 enum ab8500_fg_calibration_state calib_state; 222 enum ab8500_fg_discharge_state discharge_state; 223 enum ab8500_fg_charge_state charge_state; 224 struct completion ab8500_fg_started; 225 struct completion ab8500_fg_complete; 226 struct ab8500_fg_flags flags; 227 struct ab8500_fg_battery_capacity bat_cap; 228 struct ab8500_fg_avg_cap avg_cap; 229 struct ab8500 *parent; 230 struct iio_channel *main_bat_v; 231 struct ab8500_bm_data *bm; 232 struct power_supply *fg_psy; 233 struct workqueue_struct *fg_wq; 234 struct delayed_work fg_periodic_work; 235 struct delayed_work fg_low_bat_work; 236 struct delayed_work fg_reinit_work; 237 struct work_struct fg_work; 238 struct work_struct fg_acc_cur_work; 239 struct delayed_work fg_check_hw_failure_work; 240 struct mutex cc_lock; 241 struct kobject fg_kobject; 242}; 243static LIST_HEAD(ab8500_fg_list); 244 245/** 246 * ab8500_fg_get() - returns a reference to the primary AB8500 fuel gauge 247 * (i.e. the first fuel gauge in the instance list) 248 */ 249struct ab8500_fg *ab8500_fg_get(void) 250{ 251 return list_first_entry_or_null(&ab8500_fg_list, struct ab8500_fg, 252 node); 253} 254 255/* Main battery properties */ 256static enum power_supply_property ab8500_fg_props[] = { 257 POWER_SUPPLY_PROP_VOLTAGE_NOW, 258 POWER_SUPPLY_PROP_CURRENT_NOW, 259 POWER_SUPPLY_PROP_CURRENT_AVG, 260 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 261 POWER_SUPPLY_PROP_ENERGY_FULL, 262 POWER_SUPPLY_PROP_ENERGY_NOW, 263 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 264 POWER_SUPPLY_PROP_CHARGE_FULL, 265 POWER_SUPPLY_PROP_CHARGE_NOW, 266 POWER_SUPPLY_PROP_CAPACITY, 267 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 268}; 269 270/* 271 * This array maps the raw hex value to lowbat voltage used by the AB8500 272 * Values taken from the UM0836, in microvolts. 273 */ 274static int ab8500_fg_lowbat_voltage_map[] = { 275 2300000, 276 2325000, 277 2350000, 278 2375000, 279 2400000, 280 2425000, 281 2450000, 282 2475000, 283 2500000, 284 2525000, 285 2550000, 286 2575000, 287 2600000, 288 2625000, 289 2650000, 290 2675000, 291 2700000, 292 2725000, 293 2750000, 294 2775000, 295 2800000, 296 2825000, 297 2850000, 298 2875000, 299 2900000, 300 2925000, 301 2950000, 302 2975000, 303 3000000, 304 3025000, 305 3050000, 306 3075000, 307 3100000, 308 3125000, 309 3150000, 310 3175000, 311 3200000, 312 3225000, 313 3250000, 314 3275000, 315 3300000, 316 3325000, 317 3350000, 318 3375000, 319 3400000, 320 3425000, 321 3450000, 322 3475000, 323 3500000, 324 3525000, 325 3550000, 326 3575000, 327 3600000, 328 3625000, 329 3650000, 330 3675000, 331 3700000, 332 3725000, 333 3750000, 334 3775000, 335 3800000, 336 3825000, 337 3850000, 338 3850000, 339}; 340 341static u8 ab8500_volt_to_regval(int voltage_uv) 342{ 343 int i; 344 345 if (voltage_uv < ab8500_fg_lowbat_voltage_map[0]) 346 return 0; 347 348 for (i = 0; i < ARRAY_SIZE(ab8500_fg_lowbat_voltage_map); i++) { 349 if (voltage_uv < ab8500_fg_lowbat_voltage_map[i]) 350 return (u8) i - 1; 351 } 352 353 /* If not captured above, return index of last element */ 354 return (u8) ARRAY_SIZE(ab8500_fg_lowbat_voltage_map) - 1; 355} 356 357/** 358 * ab8500_fg_is_low_curr() - Low or high current mode 359 * @di: pointer to the ab8500_fg structure 360 * @curr_ua: the current to base or our decision on in microampere 361 * 362 * Low current mode if the current consumption is below a certain threshold 363 */ 364static int ab8500_fg_is_low_curr(struct ab8500_fg *di, int curr_ua) 365{ 366 /* 367 * We want to know if we're in low current mode 368 */ 369 if (curr_ua > -di->bm->fg_params->high_curr_threshold_ua) 370 return true; 371 else 372 return false; 373} 374 375/** 376 * ab8500_fg_add_cap_sample() - Add capacity to average filter 377 * @di: pointer to the ab8500_fg structure 378 * @sample: the capacity in mAh to add to the filter 379 * 380 * A capacity is added to the filter and a new mean capacity is calculated and 381 * returned 382 */ 383static int ab8500_fg_add_cap_sample(struct ab8500_fg *di, int sample) 384{ 385 time64_t now = ktime_get_boottime_seconds(); 386 struct ab8500_fg_avg_cap *avg = &di->avg_cap; 387 388 do { 389 avg->sum += sample - avg->samples[avg->pos]; 390 avg->samples[avg->pos] = sample; 391 avg->time_stamps[avg->pos] = now; 392 avg->pos++; 393 394 if (avg->pos == NBR_AVG_SAMPLES) 395 avg->pos = 0; 396 397 if (avg->nbr_samples < NBR_AVG_SAMPLES) 398 avg->nbr_samples++; 399 400 /* 401 * Check the time stamp for each sample. If too old, 402 * replace with latest sample 403 */ 404 } while (now - VALID_CAPACITY_SEC > avg->time_stamps[avg->pos]); 405 406 avg->avg = avg->sum / avg->nbr_samples; 407 408 return avg->avg; 409} 410 411/** 412 * ab8500_fg_clear_cap_samples() - Clear average filter 413 * @di: pointer to the ab8500_fg structure 414 * 415 * The capacity filter is reset to zero. 416 */ 417static void ab8500_fg_clear_cap_samples(struct ab8500_fg *di) 418{ 419 int i; 420 struct ab8500_fg_avg_cap *avg = &di->avg_cap; 421 422 avg->pos = 0; 423 avg->nbr_samples = 0; 424 avg->sum = 0; 425 avg->avg = 0; 426 427 for (i = 0; i < NBR_AVG_SAMPLES; i++) { 428 avg->samples[i] = 0; 429 avg->time_stamps[i] = 0; 430 } 431} 432 433/** 434 * ab8500_fg_fill_cap_sample() - Fill average filter 435 * @di: pointer to the ab8500_fg structure 436 * @sample: the capacity in mAh to fill the filter with 437 * 438 * The capacity filter is filled with a capacity in mAh 439 */ 440static void ab8500_fg_fill_cap_sample(struct ab8500_fg *di, int sample) 441{ 442 int i; 443 time64_t now; 444 struct ab8500_fg_avg_cap *avg = &di->avg_cap; 445 446 now = ktime_get_boottime_seconds(); 447 448 for (i = 0; i < NBR_AVG_SAMPLES; i++) { 449 avg->samples[i] = sample; 450 avg->time_stamps[i] = now; 451 } 452 453 avg->pos = 0; 454 avg->nbr_samples = NBR_AVG_SAMPLES; 455 avg->sum = sample * NBR_AVG_SAMPLES; 456 avg->avg = sample; 457} 458 459/** 460 * ab8500_fg_coulomb_counter() - enable coulomb counter 461 * @di: pointer to the ab8500_fg structure 462 * @enable: enable/disable 463 * 464 * Enable/Disable coulomb counter. 465 * On failure returns negative value. 466 */ 467static int ab8500_fg_coulomb_counter(struct ab8500_fg *di, bool enable) 468{ 469 int ret = 0; 470 mutex_lock(&di->cc_lock); 471 if (enable) { 472 /* To be able to reprogram the number of samples, we have to 473 * first stop the CC and then enable it again */ 474 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, 475 AB8500_RTC_CC_CONF_REG, 0x00); 476 if (ret) 477 goto cc_err; 478 479 /* Program the samples */ 480 ret = abx500_set_register_interruptible(di->dev, 481 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU, 482 di->fg_samples); 483 if (ret) 484 goto cc_err; 485 486 /* Start the CC */ 487 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, 488 AB8500_RTC_CC_CONF_REG, 489 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA)); 490 if (ret) 491 goto cc_err; 492 493 di->flags.fg_enabled = true; 494 } else { 495 /* Clear any pending read requests */ 496 ret = abx500_mask_and_set_register_interruptible(di->dev, 497 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 498 (RESET_ACCU | READ_REQ), 0); 499 if (ret) 500 goto cc_err; 501 502 ret = abx500_set_register_interruptible(di->dev, 503 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU_CTRL, 0); 504 if (ret) 505 goto cc_err; 506 507 /* Stop the CC */ 508 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, 509 AB8500_RTC_CC_CONF_REG, 0); 510 if (ret) 511 goto cc_err; 512 513 di->flags.fg_enabled = false; 514 515 } 516 dev_dbg(di->dev, " CC enabled: %d Samples: %d\n", 517 enable, di->fg_samples); 518 519 mutex_unlock(&di->cc_lock); 520 521 return ret; 522cc_err: 523 dev_err(di->dev, "%s Enabling coulomb counter failed\n", __func__); 524 mutex_unlock(&di->cc_lock); 525 return ret; 526} 527 528/** 529 * ab8500_fg_inst_curr_start() - start battery instantaneous current 530 * @di: pointer to the ab8500_fg structure 531 * 532 * Returns 0 or error code 533 * Note: This is part "one" and has to be called before 534 * ab8500_fg_inst_curr_finalize() 535 */ 536int ab8500_fg_inst_curr_start(struct ab8500_fg *di) 537{ 538 u8 reg_val; 539 int ret; 540 541 mutex_lock(&di->cc_lock); 542 543 di->nbr_cceoc_irq_cnt = 0; 544 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, 545 AB8500_RTC_CC_CONF_REG, ®_val); 546 if (ret < 0) 547 goto fail; 548 549 if (!(reg_val & CC_PWR_UP_ENA)) { 550 dev_dbg(di->dev, "%s Enable FG\n", __func__); 551 di->turn_off_fg = true; 552 553 /* Program the samples */ 554 ret = abx500_set_register_interruptible(di->dev, 555 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU, 556 SEC_TO_SAMPLE(10)); 557 if (ret) 558 goto fail; 559 560 /* Start the CC */ 561 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, 562 AB8500_RTC_CC_CONF_REG, 563 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA)); 564 if (ret) 565 goto fail; 566 } else { 567 di->turn_off_fg = false; 568 } 569 570 /* Return and WFI */ 571 reinit_completion(&di->ab8500_fg_started); 572 reinit_completion(&di->ab8500_fg_complete); 573 enable_irq(di->irq); 574 575 /* Note: cc_lock is still locked */ 576 return 0; 577fail: 578 mutex_unlock(&di->cc_lock); 579 return ret; 580} 581 582/** 583 * ab8500_fg_inst_curr_started() - check if fg conversion has started 584 * @di: pointer to the ab8500_fg structure 585 * 586 * Returns 1 if conversion started, 0 if still waiting 587 */ 588int ab8500_fg_inst_curr_started(struct ab8500_fg *di) 589{ 590 return completion_done(&di->ab8500_fg_started); 591} 592 593/** 594 * ab8500_fg_inst_curr_done() - check if fg conversion is done 595 * @di: pointer to the ab8500_fg structure 596 * 597 * Returns 1 if conversion done, 0 if still waiting 598 */ 599int ab8500_fg_inst_curr_done(struct ab8500_fg *di) 600{ 601 return completion_done(&di->ab8500_fg_complete); 602} 603 604/** 605 * ab8500_fg_inst_curr_finalize() - battery instantaneous current 606 * @di: pointer to the ab8500_fg structure 607 * @curr_ua: battery instantenous current in microampere (on success) 608 * 609 * Returns 0 or an error code 610 * Note: This is part "two" and has to be called at earliest 250 ms 611 * after ab8500_fg_inst_curr_start() 612 */ 613int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *curr_ua) 614{ 615 u8 low, high; 616 int val; 617 int ret; 618 unsigned long timeout; 619 620 if (!completion_done(&di->ab8500_fg_complete)) { 621 timeout = wait_for_completion_timeout( 622 &di->ab8500_fg_complete, 623 INS_CURR_TIMEOUT); 624 dev_dbg(di->dev, "Finalize time: %d ms\n", 625 jiffies_to_msecs(INS_CURR_TIMEOUT - timeout)); 626 if (!timeout) { 627 ret = -ETIME; 628 disable_irq(di->irq); 629 di->nbr_cceoc_irq_cnt = 0; 630 dev_err(di->dev, "completion timed out [%d]\n", 631 __LINE__); 632 goto fail; 633 } 634 } 635 636 disable_irq(di->irq); 637 di->nbr_cceoc_irq_cnt = 0; 638 639 ret = abx500_mask_and_set_register_interruptible(di->dev, 640 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 641 READ_REQ, READ_REQ); 642 643 /* 100uS between read request and read is needed */ 644 usleep_range(100, 100); 645 646 /* Read CC Sample conversion value Low and high */ 647 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, 648 AB8500_GASG_CC_SMPL_CNVL_REG, &low); 649 if (ret < 0) 650 goto fail; 651 652 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, 653 AB8500_GASG_CC_SMPL_CNVH_REG, &high); 654 if (ret < 0) 655 goto fail; 656 657 /* 658 * negative value for Discharging 659 * convert 2's complement into decimal 660 */ 661 if (high & 0x10) 662 val = (low | (high << 8) | 0xFFFFE000); 663 else 664 val = (low | (high << 8)); 665 666 /* 667 * Convert to unit value in mA 668 * Full scale input voltage is 669 * 63.160mV => LSB = 63.160mV/(4096*res) = 1.542.000 uA 670 * Given a 250ms conversion cycle time the LSB corresponds 671 * to 107.1 nAh. Convert to current by dividing by the conversion 672 * time in hours (250ms = 1 / (3600 * 4)h) 673 * 107.1nAh assumes 10mOhm, but fg_res is in 0.1mOhm 674 */ 675 val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) / di->bm->fg_res; 676 677 if (di->turn_off_fg) { 678 dev_dbg(di->dev, "%s Disable FG\n", __func__); 679 680 /* Clear any pending read requests */ 681 ret = abx500_set_register_interruptible(di->dev, 682 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0); 683 if (ret) 684 goto fail; 685 686 /* Stop the CC */ 687 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, 688 AB8500_RTC_CC_CONF_REG, 0); 689 if (ret) 690 goto fail; 691 } 692 mutex_unlock(&di->cc_lock); 693 *curr_ua = val; 694 695 return 0; 696fail: 697 mutex_unlock(&di->cc_lock); 698 return ret; 699} 700 701/** 702 * ab8500_fg_inst_curr_blocking() - battery instantaneous current 703 * @di: pointer to the ab8500_fg structure 704 * 705 * Returns battery instantenous current in microampere (on success) 706 * else error code 707 */ 708int ab8500_fg_inst_curr_blocking(struct ab8500_fg *di) 709{ 710 int ret; 711 unsigned long timeout; 712 int curr_ua = 0; 713 714 ret = ab8500_fg_inst_curr_start(di); 715 if (ret) { 716 dev_err(di->dev, "Failed to initialize fg_inst\n"); 717 return 0; 718 } 719 720 /* Wait for CC to actually start */ 721 if (!completion_done(&di->ab8500_fg_started)) { 722 timeout = wait_for_completion_timeout( 723 &di->ab8500_fg_started, 724 INS_CURR_TIMEOUT); 725 dev_dbg(di->dev, "Start time: %d ms\n", 726 jiffies_to_msecs(INS_CURR_TIMEOUT - timeout)); 727 if (!timeout) { 728 ret = -ETIME; 729 dev_err(di->dev, "completion timed out [%d]\n", 730 __LINE__); 731 goto fail; 732 } 733 } 734 735 ret = ab8500_fg_inst_curr_finalize(di, &curr_ua); 736 if (ret) { 737 dev_err(di->dev, "Failed to finalize fg_inst\n"); 738 return 0; 739 } 740 741 dev_dbg(di->dev, "%s instant current: %d uA", __func__, curr_ua); 742 return curr_ua; 743fail: 744 disable_irq(di->irq); 745 mutex_unlock(&di->cc_lock); 746 return ret; 747} 748 749/** 750 * ab8500_fg_acc_cur_work() - average battery current 751 * @work: pointer to the work_struct structure 752 * 753 * Updated the average battery current obtained from the 754 * coulomb counter. 755 */ 756static void ab8500_fg_acc_cur_work(struct work_struct *work) 757{ 758 int val; 759 int ret; 760 u8 low, med, high; 761 762 struct ab8500_fg *di = container_of(work, 763 struct ab8500_fg, fg_acc_cur_work); 764 765 mutex_lock(&di->cc_lock); 766 ret = abx500_set_register_interruptible(di->dev, AB8500_GAS_GAUGE, 767 AB8500_GASG_CC_NCOV_ACCU_CTRL, RD_NCONV_ACCU_REQ); 768 if (ret) 769 goto exit; 770 771 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, 772 AB8500_GASG_CC_NCOV_ACCU_LOW, &low); 773 if (ret < 0) 774 goto exit; 775 776 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, 777 AB8500_GASG_CC_NCOV_ACCU_MED, &med); 778 if (ret < 0) 779 goto exit; 780 781 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, 782 AB8500_GASG_CC_NCOV_ACCU_HIGH, &high); 783 if (ret < 0) 784 goto exit; 785 786 /* Check for sign bit in case of negative value, 2's complement */ 787 if (high & 0x10) 788 val = (low | (med << 8) | (high << 16) | 0xFFE00000); 789 else 790 val = (low | (med << 8) | (high << 16)); 791 792 /* 793 * Convert to uAh 794 * Given a 250ms conversion cycle time the LSB corresponds 795 * to 112.9 nAh. 796 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm 797 */ 798 di->accu_charge = (val * QLSB_NANO_AMP_HOURS_X10) / 799 (100 * di->bm->fg_res); 800 801 /* 802 * Convert to unit value in uA 803 * by dividing by the conversion 804 * time in hours (= samples / (3600 * 4)h) 805 */ 806 di->avg_curr_ua = (val * QLSB_NANO_AMP_HOURS_X10 * 36) / 807 (di->bm->fg_res * (di->fg_samples / 4)); 808 809 di->flags.conv_done = true; 810 811 mutex_unlock(&di->cc_lock); 812 813 queue_work(di->fg_wq, &di->fg_work); 814 815 dev_dbg(di->dev, "fg_res: %d, fg_samples: %d, gasg: %d, accu_charge: %d \n", 816 di->bm->fg_res, di->fg_samples, val, di->accu_charge); 817 return; 818exit: 819 dev_err(di->dev, 820 "Failed to read or write gas gauge registers\n"); 821 mutex_unlock(&di->cc_lock); 822 queue_work(di->fg_wq, &di->fg_work); 823} 824 825/** 826 * ab8500_fg_bat_voltage() - get battery voltage 827 * @di: pointer to the ab8500_fg structure 828 * 829 * Returns battery voltage in microvolts (on success) else error code 830 */ 831static int ab8500_fg_bat_voltage(struct ab8500_fg *di) 832{ 833 int vbat, ret; 834 static int prev; 835 836 ret = iio_read_channel_processed(di->main_bat_v, &vbat); 837 if (ret < 0) { 838 dev_err(di->dev, 839 "%s ADC conversion failed, using previous value\n", 840 __func__); 841 return prev; 842 } 843 844 /* IIO returns millivolts but we want microvolts */ 845 vbat *= 1000; 846 prev = vbat; 847 return vbat; 848} 849 850/** 851 * ab8500_fg_volt_to_capacity() - Voltage based capacity 852 * @di: pointer to the ab8500_fg structure 853 * @voltage_uv: The voltage to convert to a capacity in microvolt 854 * 855 * Returns battery capacity in per mille based on voltage 856 */ 857static int ab8500_fg_volt_to_capacity(struct ab8500_fg *di, int voltage_uv) 858{ 859 struct power_supply_battery_info *bi = di->bm->bi; 860 861 /* Multiply by 10 because the capacity is tracked in per mille */ 862 return power_supply_batinfo_ocv2cap(bi, voltage_uv, di->bat_temp) * 10; 863} 864 865/** 866 * ab8500_fg_uncomp_volt_to_capacity() - Uncompensated voltage based capacity 867 * @di: pointer to the ab8500_fg structure 868 * 869 * Returns battery capacity based on battery voltage that is not compensated 870 * for the voltage drop due to the load 871 */ 872static int ab8500_fg_uncomp_volt_to_capacity(struct ab8500_fg *di) 873{ 874 di->vbat_uv = ab8500_fg_bat_voltage(di); 875 return ab8500_fg_volt_to_capacity(di, di->vbat_uv); 876} 877 878/** 879 * ab8500_fg_battery_resistance() - Returns the battery inner resistance 880 * @di: pointer to the ab8500_fg structure 881 * @vbat_uncomp_uv: Uncompensated VBAT voltage 882 * 883 * Returns battery inner resistance added with the fuel gauge resistor value 884 * to get the total resistance in the whole link from gnd to bat+ node 885 * in milliohm. 886 */ 887static int ab8500_fg_battery_resistance(struct ab8500_fg *di, int vbat_uncomp_uv) 888{ 889 struct power_supply_battery_info *bi = di->bm->bi; 890 int resistance_percent = 0; 891 int resistance; 892 893 /* 894 * Determine the resistance at this voltage. First try VBAT-to-Ri else 895 * just infer it from the surrounding temperature, if nothing works just 896 * use the internal resistance. 897 */ 898 if (power_supply_supports_vbat2ri(bi)) { 899 resistance = power_supply_vbat2ri(bi, vbat_uncomp_uv, di->flags.charging); 900 /* Convert to milliohm */ 901 resistance = resistance / 1000; 902 } else if (power_supply_supports_temp2ri(bi)) { 903 resistance_percent = power_supply_temp2resist_simple(bi->resist_table, 904 bi->resist_table_size, 905 di->bat_temp / 10); 906 /* Convert to milliohm */ 907 resistance = bi->factory_internal_resistance_uohm / 1000; 908 resistance = resistance * resistance_percent / 100; 909 } else { 910 /* Last fallback */ 911 resistance = bi->factory_internal_resistance_uohm / 1000; 912 } 913 914 /* Compensate for line impedance */ 915 resistance += (di->line_impedance_uohm / 1000); 916 917 dev_dbg(di->dev, "%s Temp: %d battery internal resistance: %d" 918 " fg resistance %d, total: %d (mOhm)\n", 919 __func__, di->bat_temp, resistance, di->bm->fg_res / 10, 920 (di->bm->fg_res / 10) + resistance); 921 922 /* fg_res variable is in 0.1mOhm */ 923 resistance += di->bm->fg_res / 10; 924 925 return resistance; 926} 927 928/** 929 * ab8500_load_comp_fg_bat_voltage() - get load compensated battery voltage 930 * @di: pointer to the ab8500_fg structure 931 * @always: always return a voltage, also uncompensated 932 * 933 * Returns compensated battery voltage (on success) else error code. 934 * If always is specified, we always return a voltage but it may be 935 * uncompensated. 936 */ 937static int ab8500_load_comp_fg_bat_voltage(struct ab8500_fg *di, bool always) 938{ 939 int i = 0; 940 int vbat_uv = 0; 941 int rcomp; 942 943 /* Average the instant current to get a stable current measurement */ 944 ab8500_fg_inst_curr_start(di); 945 946 do { 947 vbat_uv += ab8500_fg_bat_voltage(di); 948 i++; 949 usleep_range(5000, 6000); 950 } while (!ab8500_fg_inst_curr_done(di) && 951 i <= WAIT_FOR_INST_CURRENT_MAX); 952 953 if (i > WAIT_FOR_INST_CURRENT_MAX) { 954 dev_err(di->dev, 955 "TIMEOUT: return uncompensated measurement of VBAT\n"); 956 di->vbat_uv = vbat_uv / i; 957 return di->vbat_uv; 958 } 959 960 ab8500_fg_inst_curr_finalize(di, &di->inst_curr_ua); 961 962 /* 963 * If there is too high current dissipation, the compensation cannot be 964 * trusted so return an error unless we must return something here, as 965 * enforced by the "always" parameter. 966 */ 967 if (!always && di->inst_curr_ua < IGNORE_VBAT_HIGHCUR) 968 return -EINVAL; 969 970 vbat_uv = vbat_uv / i; 971 972 /* Next we apply voltage compensation from internal resistance */ 973 rcomp = ab8500_fg_battery_resistance(di, vbat_uv); 974 vbat_uv = vbat_uv - (di->inst_curr_ua * rcomp) / 1000; 975 976 /* Always keep this state at latest measurement */ 977 di->vbat_uv = vbat_uv; 978 979 return vbat_uv; 980} 981 982/** 983 * ab8500_fg_load_comp_volt_to_capacity() - Load compensated voltage based capacity 984 * @di: pointer to the ab8500_fg structure 985 * 986 * Returns battery capacity based on battery voltage that is load compensated 987 * for the voltage drop 988 */ 989static int ab8500_fg_load_comp_volt_to_capacity(struct ab8500_fg *di) 990{ 991 int vbat_comp_uv; 992 993 vbat_comp_uv = ab8500_load_comp_fg_bat_voltage(di, true); 994 995 return ab8500_fg_volt_to_capacity(di, vbat_comp_uv); 996} 997 998/** 999 * ab8500_fg_convert_mah_to_permille() - Capacity in mAh to permille 1000 * @di: pointer to the ab8500_fg structure 1001 * @cap_mah: capacity in mAh 1002 * 1003 * Converts capacity in mAh to capacity in permille 1004 */ 1005static int ab8500_fg_convert_mah_to_permille(struct ab8500_fg *di, int cap_mah) 1006{ 1007 return (cap_mah * 1000) / di->bat_cap.max_mah_design; 1008} 1009 1010/** 1011 * ab8500_fg_convert_permille_to_mah() - Capacity in permille to mAh 1012 * @di: pointer to the ab8500_fg structure 1013 * @cap_pm: capacity in permille 1014 * 1015 * Converts capacity in permille to capacity in mAh 1016 */ 1017static int ab8500_fg_convert_permille_to_mah(struct ab8500_fg *di, int cap_pm) 1018{ 1019 return cap_pm * di->bat_cap.max_mah_design / 1000; 1020} 1021 1022/** 1023 * ab8500_fg_convert_mah_to_uwh() - Capacity in mAh to uWh 1024 * @di: pointer to the ab8500_fg structure 1025 * @cap_mah: capacity in mAh 1026 * 1027 * Converts capacity in mAh to capacity in uWh 1028 */ 1029static int ab8500_fg_convert_mah_to_uwh(struct ab8500_fg *di, int cap_mah) 1030{ 1031 u64 div_res; 1032 u32 div_rem; 1033 1034 /* 1035 * Capacity is in milli ampere hours (10^-3)Ah 1036 * Nominal voltage is in microvolts (10^-6)V 1037 * divide by 1000000 after multiplication to get to mWh 1038 */ 1039 div_res = ((u64) cap_mah) * ((u64) di->vbat_nom_uv); 1040 div_rem = do_div(div_res, 1000000); 1041 1042 /* Make sure to round upwards if necessary */ 1043 if (div_rem >= 1000000 / 2) 1044 div_res++; 1045 1046 return (int) div_res; 1047} 1048 1049/** 1050 * ab8500_fg_calc_cap_charging() - Calculate remaining capacity while charging 1051 * @di: pointer to the ab8500_fg structure 1052 * 1053 * Return the capacity in mAh based on previous calculated capcity and the FG 1054 * accumulator register value. The filter is filled with this capacity 1055 */ 1056static int ab8500_fg_calc_cap_charging(struct ab8500_fg *di) 1057{ 1058 dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n", 1059 __func__, 1060 di->bat_cap.mah, 1061 di->accu_charge); 1062 1063 /* Capacity should not be less than 0 */ 1064 if (di->bat_cap.mah + di->accu_charge > 0) 1065 di->bat_cap.mah += di->accu_charge; 1066 else 1067 di->bat_cap.mah = 0; 1068 /* 1069 * We force capacity to 100% once when the algorithm 1070 * reports that it's full. 1071 */ 1072 if (di->bat_cap.mah >= di->bat_cap.max_mah_design || 1073 di->flags.force_full) { 1074 di->bat_cap.mah = di->bat_cap.max_mah_design; 1075 } 1076 1077 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah); 1078 di->bat_cap.permille = 1079 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah); 1080 1081 /* We need to update battery voltage and inst current when charging */ 1082 di->vbat_uv = ab8500_fg_bat_voltage(di); 1083 di->inst_curr_ua = ab8500_fg_inst_curr_blocking(di); 1084 1085 return di->bat_cap.mah; 1086} 1087 1088/** 1089 * ab8500_fg_calc_cap_discharge_voltage() - Capacity in discharge with voltage 1090 * @di: pointer to the ab8500_fg structure 1091 * 1092 * Return the capacity in mAh based on the load compensated battery voltage. 1093 * This value is added to the filter and a new mean value is calculated and 1094 * returned. 1095 */ 1096static int ab8500_fg_calc_cap_discharge_voltage(struct ab8500_fg *di) 1097{ 1098 int permille, mah; 1099 1100 permille = ab8500_fg_load_comp_volt_to_capacity(di); 1101 1102 mah = ab8500_fg_convert_permille_to_mah(di, permille); 1103 1104 di->bat_cap.mah = ab8500_fg_add_cap_sample(di, mah); 1105 di->bat_cap.permille = 1106 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah); 1107 1108 return di->bat_cap.mah; 1109} 1110 1111/** 1112 * ab8500_fg_calc_cap_discharge_fg() - Capacity in discharge with FG 1113 * @di: pointer to the ab8500_fg structure 1114 * 1115 * Return the capacity in mAh based on previous calculated capcity and the FG 1116 * accumulator register value. This value is added to the filter and a 1117 * new mean value is calculated and returned. 1118 */ 1119static int ab8500_fg_calc_cap_discharge_fg(struct ab8500_fg *di) 1120{ 1121 int permille_volt, permille; 1122 1123 dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n", 1124 __func__, 1125 di->bat_cap.mah, 1126 di->accu_charge); 1127 1128 /* Capacity should not be less than 0 */ 1129 if (di->bat_cap.mah + di->accu_charge > 0) 1130 di->bat_cap.mah += di->accu_charge; 1131 else 1132 di->bat_cap.mah = 0; 1133 1134 if (di->bat_cap.mah >= di->bat_cap.max_mah_design) 1135 di->bat_cap.mah = di->bat_cap.max_mah_design; 1136 1137 /* 1138 * Check against voltage based capacity. It can not be lower 1139 * than what the uncompensated voltage says 1140 */ 1141 permille = ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah); 1142 permille_volt = ab8500_fg_uncomp_volt_to_capacity(di); 1143 1144 if (permille < permille_volt) { 1145 di->bat_cap.permille = permille_volt; 1146 di->bat_cap.mah = ab8500_fg_convert_permille_to_mah(di, 1147 di->bat_cap.permille); 1148 1149 dev_dbg(di->dev, "%s voltage based: perm %d perm_volt %d\n", 1150 __func__, 1151 permille, 1152 permille_volt); 1153 1154 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah); 1155 } else { 1156 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah); 1157 di->bat_cap.permille = 1158 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah); 1159 } 1160 1161 return di->bat_cap.mah; 1162} 1163 1164/** 1165 * ab8500_fg_capacity_level() - Get the battery capacity level 1166 * @di: pointer to the ab8500_fg structure 1167 * 1168 * Get the battery capacity level based on the capacity in percent 1169 */ 1170static int ab8500_fg_capacity_level(struct ab8500_fg *di) 1171{ 1172 int ret, percent; 1173 1174 percent = DIV_ROUND_CLOSEST(di->bat_cap.permille, 10); 1175 1176 if (percent <= di->bm->cap_levels->critical || 1177 di->flags.low_bat) 1178 ret = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; 1179 else if (percent <= di->bm->cap_levels->low) 1180 ret = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 1181 else if (percent <= di->bm->cap_levels->normal) 1182 ret = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 1183 else if (percent <= di->bm->cap_levels->high) 1184 ret = POWER_SUPPLY_CAPACITY_LEVEL_HIGH; 1185 else 1186 ret = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 1187 1188 return ret; 1189} 1190 1191/** 1192 * ab8500_fg_calculate_scaled_capacity() - Capacity scaling 1193 * @di: pointer to the ab8500_fg structure 1194 * 1195 * Calculates the capacity to be shown to upper layers. Scales the capacity 1196 * to have 100% as a reference from the actual capacity upon removal of charger 1197 * when charging is in maintenance mode. 1198 */ 1199static int ab8500_fg_calculate_scaled_capacity(struct ab8500_fg *di) 1200{ 1201 struct ab8500_fg_cap_scaling *cs = &di->bat_cap.cap_scale; 1202 int capacity = di->bat_cap.prev_percent; 1203 1204 if (!cs->enable) 1205 return capacity; 1206 1207 /* 1208 * As long as we are in fully charge mode scale the capacity 1209 * to show 100%. 1210 */ 1211 if (di->flags.fully_charged) { 1212 cs->cap_to_scale[0] = 100; 1213 cs->cap_to_scale[1] = 1214 max(capacity, di->bm->fg_params->maint_thres); 1215 dev_dbg(di->dev, "Scale cap with %d/%d\n", 1216 cs->cap_to_scale[0], cs->cap_to_scale[1]); 1217 } 1218 1219 /* Calculates the scaled capacity. */ 1220 if ((cs->cap_to_scale[0] != cs->cap_to_scale[1]) 1221 && (cs->cap_to_scale[1] > 0)) 1222 capacity = min(100, 1223 DIV_ROUND_CLOSEST(di->bat_cap.prev_percent * 1224 cs->cap_to_scale[0], 1225 cs->cap_to_scale[1])); 1226 1227 if (di->flags.charging) { 1228 if (capacity < cs->disable_cap_level) { 1229 cs->disable_cap_level = capacity; 1230 dev_dbg(di->dev, "Cap to stop scale lowered %d%%\n", 1231 cs->disable_cap_level); 1232 } else if (!di->flags.fully_charged) { 1233 if (di->bat_cap.prev_percent >= 1234 cs->disable_cap_level) { 1235 dev_dbg(di->dev, "Disabling scaled capacity\n"); 1236 cs->enable = false; 1237 capacity = di->bat_cap.prev_percent; 1238 } else { 1239 dev_dbg(di->dev, 1240 "Waiting in cap to level %d%%\n", 1241 cs->disable_cap_level); 1242 capacity = cs->disable_cap_level; 1243 } 1244 } 1245 } 1246 1247 return capacity; 1248} 1249 1250/** 1251 * ab8500_fg_update_cap_scalers() - Capacity scaling 1252 * @di: pointer to the ab8500_fg structure 1253 * 1254 * To be called when state change from charge<->discharge to update 1255 * the capacity scalers. 1256 */ 1257static void ab8500_fg_update_cap_scalers(struct ab8500_fg *di) 1258{ 1259 struct ab8500_fg_cap_scaling *cs = &di->bat_cap.cap_scale; 1260 1261 if (!cs->enable) 1262 return; 1263 if (di->flags.charging) { 1264 di->bat_cap.cap_scale.disable_cap_level = 1265 di->bat_cap.cap_scale.scaled_cap; 1266 dev_dbg(di->dev, "Cap to stop scale at charge %d%%\n", 1267 di->bat_cap.cap_scale.disable_cap_level); 1268 } else { 1269 if (cs->scaled_cap != 100) { 1270 cs->cap_to_scale[0] = cs->scaled_cap; 1271 cs->cap_to_scale[1] = di->bat_cap.prev_percent; 1272 } else { 1273 cs->cap_to_scale[0] = 100; 1274 cs->cap_to_scale[1] = 1275 max(di->bat_cap.prev_percent, 1276 di->bm->fg_params->maint_thres); 1277 } 1278 1279 dev_dbg(di->dev, "Cap to scale at discharge %d/%d\n", 1280 cs->cap_to_scale[0], cs->cap_to_scale[1]); 1281 } 1282} 1283 1284/** 1285 * ab8500_fg_check_capacity_limits() - Check if capacity has changed 1286 * @di: pointer to the ab8500_fg structure 1287 * @init: capacity is allowed to go up in init mode 1288 * 1289 * Check if capacity or capacity limit has changed and notify the system 1290 * about it using the power_supply framework 1291 */ 1292static void ab8500_fg_check_capacity_limits(struct ab8500_fg *di, bool init) 1293{ 1294 bool changed = false; 1295 int percent = DIV_ROUND_CLOSEST(di->bat_cap.permille, 10); 1296 1297 di->bat_cap.level = ab8500_fg_capacity_level(di); 1298 1299 if (di->bat_cap.level != di->bat_cap.prev_level) { 1300 /* 1301 * We do not allow reported capacity level to go up 1302 * unless we're charging or if we're in init 1303 */ 1304 if (!(!di->flags.charging && di->bat_cap.level > 1305 di->bat_cap.prev_level) || init) { 1306 dev_dbg(di->dev, "level changed from %d to %d\n", 1307 di->bat_cap.prev_level, 1308 di->bat_cap.level); 1309 di->bat_cap.prev_level = di->bat_cap.level; 1310 changed = true; 1311 } else { 1312 dev_dbg(di->dev, "level not allowed to go up " 1313 "since no charger is connected: %d to %d\n", 1314 di->bat_cap.prev_level, 1315 di->bat_cap.level); 1316 } 1317 } 1318 1319 /* 1320 * If we have received the LOW_BAT IRQ, set capacity to 0 to initiate 1321 * shutdown 1322 */ 1323 if (di->flags.low_bat) { 1324 dev_dbg(di->dev, "Battery low, set capacity to 0\n"); 1325 di->bat_cap.prev_percent = 0; 1326 di->bat_cap.permille = 0; 1327 percent = 0; 1328 di->bat_cap.prev_mah = 0; 1329 di->bat_cap.mah = 0; 1330 changed = true; 1331 } else if (di->flags.fully_charged) { 1332 /* 1333 * We report 100% if algorithm reported fully charged 1334 * and show 100% during maintenance charging (scaling). 1335 */ 1336 if (di->flags.force_full) { 1337 di->bat_cap.prev_percent = percent; 1338 di->bat_cap.prev_mah = di->bat_cap.mah; 1339 1340 changed = true; 1341 1342 if (!di->bat_cap.cap_scale.enable && 1343 di->bm->capacity_scaling) { 1344 di->bat_cap.cap_scale.enable = true; 1345 di->bat_cap.cap_scale.cap_to_scale[0] = 100; 1346 di->bat_cap.cap_scale.cap_to_scale[1] = 1347 di->bat_cap.prev_percent; 1348 di->bat_cap.cap_scale.disable_cap_level = 100; 1349 } 1350 } else if (di->bat_cap.prev_percent != percent) { 1351 dev_dbg(di->dev, 1352 "battery reported full " 1353 "but capacity dropping: %d\n", 1354 percent); 1355 di->bat_cap.prev_percent = percent; 1356 di->bat_cap.prev_mah = di->bat_cap.mah; 1357 1358 changed = true; 1359 } 1360 } else if (di->bat_cap.prev_percent != percent) { 1361 if (percent == 0) { 1362 /* 1363 * We will not report 0% unless we've got 1364 * the LOW_BAT IRQ, no matter what the FG 1365 * algorithm says. 1366 */ 1367 di->bat_cap.prev_percent = 1; 1368 percent = 1; 1369 1370 changed = true; 1371 } else if (!(!di->flags.charging && 1372 percent > di->bat_cap.prev_percent) || init) { 1373 /* 1374 * We do not allow reported capacity to go up 1375 * unless we're charging or if we're in init 1376 */ 1377 dev_dbg(di->dev, 1378 "capacity changed from %d to %d (%d)\n", 1379 di->bat_cap.prev_percent, 1380 percent, 1381 di->bat_cap.permille); 1382 di->bat_cap.prev_percent = percent; 1383 di->bat_cap.prev_mah = di->bat_cap.mah; 1384 1385 changed = true; 1386 } else { 1387 dev_dbg(di->dev, "capacity not allowed to go up since " 1388 "no charger is connected: %d to %d (%d)\n", 1389 di->bat_cap.prev_percent, 1390 percent, 1391 di->bat_cap.permille); 1392 } 1393 } 1394 1395 if (changed) { 1396 if (di->bm->capacity_scaling) { 1397 di->bat_cap.cap_scale.scaled_cap = 1398 ab8500_fg_calculate_scaled_capacity(di); 1399 1400 dev_info(di->dev, "capacity=%d (%d)\n", 1401 di->bat_cap.prev_percent, 1402 di->bat_cap.cap_scale.scaled_cap); 1403 } 1404 power_supply_changed(di->fg_psy); 1405 if (di->flags.fully_charged && di->flags.force_full) { 1406 dev_dbg(di->dev, "Battery full, notifying.\n"); 1407 di->flags.force_full = false; 1408 sysfs_notify(&di->fg_kobject, NULL, "charge_full"); 1409 } 1410 sysfs_notify(&di->fg_kobject, NULL, "charge_now"); 1411 } 1412} 1413 1414static void ab8500_fg_charge_state_to(struct ab8500_fg *di, 1415 enum ab8500_fg_charge_state new_state) 1416{ 1417 dev_dbg(di->dev, "Charge state from %d [%s] to %d [%s]\n", 1418 di->charge_state, 1419 charge_state[di->charge_state], 1420 new_state, 1421 charge_state[new_state]); 1422 1423 di->charge_state = new_state; 1424} 1425 1426static void ab8500_fg_discharge_state_to(struct ab8500_fg *di, 1427 enum ab8500_fg_discharge_state new_state) 1428{ 1429 dev_dbg(di->dev, "Discharge state from %d [%s] to %d [%s]\n", 1430 di->discharge_state, 1431 discharge_state[di->discharge_state], 1432 new_state, 1433 discharge_state[new_state]); 1434 1435 di->discharge_state = new_state; 1436} 1437 1438/** 1439 * ab8500_fg_algorithm_charging() - FG algorithm for when charging 1440 * @di: pointer to the ab8500_fg structure 1441 * 1442 * Battery capacity calculation state machine for when we're charging 1443 */ 1444static void ab8500_fg_algorithm_charging(struct ab8500_fg *di) 1445{ 1446 /* 1447 * If we change to discharge mode 1448 * we should start with recovery 1449 */ 1450 if (di->discharge_state != AB8500_FG_DISCHARGE_INIT_RECOVERY) 1451 ab8500_fg_discharge_state_to(di, 1452 AB8500_FG_DISCHARGE_INIT_RECOVERY); 1453 1454 switch (di->charge_state) { 1455 case AB8500_FG_CHARGE_INIT: 1456 di->fg_samples = SEC_TO_SAMPLE( 1457 di->bm->fg_params->accu_charging); 1458 1459 ab8500_fg_coulomb_counter(di, true); 1460 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_READOUT); 1461 1462 break; 1463 1464 case AB8500_FG_CHARGE_READOUT: 1465 /* 1466 * Read the FG and calculate the new capacity 1467 */ 1468 mutex_lock(&di->cc_lock); 1469 if (!di->flags.conv_done && !di->flags.force_full) { 1470 /* Wasn't the CC IRQ that got us here */ 1471 mutex_unlock(&di->cc_lock); 1472 dev_dbg(di->dev, "%s CC conv not done\n", 1473 __func__); 1474 1475 break; 1476 } 1477 di->flags.conv_done = false; 1478 mutex_unlock(&di->cc_lock); 1479 1480 ab8500_fg_calc_cap_charging(di); 1481 1482 break; 1483 1484 default: 1485 break; 1486 } 1487 1488 /* Check capacity limits */ 1489 ab8500_fg_check_capacity_limits(di, false); 1490} 1491 1492static void force_capacity(struct ab8500_fg *di) 1493{ 1494 int cap; 1495 1496 ab8500_fg_clear_cap_samples(di); 1497 cap = di->bat_cap.user_mah; 1498 if (cap > di->bat_cap.max_mah_design) { 1499 dev_dbg(di->dev, "Remaining cap %d can't be bigger than total" 1500 " %d\n", cap, di->bat_cap.max_mah_design); 1501 cap = di->bat_cap.max_mah_design; 1502 } 1503 ab8500_fg_fill_cap_sample(di, di->bat_cap.user_mah); 1504 di->bat_cap.permille = ab8500_fg_convert_mah_to_permille(di, cap); 1505 di->bat_cap.mah = cap; 1506 ab8500_fg_check_capacity_limits(di, true); 1507} 1508 1509static bool check_sysfs_capacity(struct ab8500_fg *di) 1510{ 1511 int cap, lower, upper; 1512 int cap_permille; 1513 1514 cap = di->bat_cap.user_mah; 1515 1516 cap_permille = ab8500_fg_convert_mah_to_permille(di, 1517 di->bat_cap.user_mah); 1518 1519 lower = di->bat_cap.permille - di->bm->fg_params->user_cap_limit * 10; 1520 upper = di->bat_cap.permille + di->bm->fg_params->user_cap_limit * 10; 1521 1522 if (lower < 0) 1523 lower = 0; 1524 /* 1000 is permille, -> 100 percent */ 1525 if (upper > 1000) 1526 upper = 1000; 1527 1528 dev_dbg(di->dev, "Capacity limits:" 1529 " (Lower: %d User: %d Upper: %d) [user: %d, was: %d]\n", 1530 lower, cap_permille, upper, cap, di->bat_cap.mah); 1531 1532 /* If within limits, use the saved capacity and exit estimation...*/ 1533 if (cap_permille > lower && cap_permille < upper) { 1534 dev_dbg(di->dev, "OK! Using users cap %d uAh now\n", cap); 1535 force_capacity(di); 1536 return true; 1537 } 1538 dev_dbg(di->dev, "Capacity from user out of limits, ignoring"); 1539 return false; 1540} 1541 1542/** 1543 * ab8500_fg_algorithm_discharging() - FG algorithm for when discharging 1544 * @di: pointer to the ab8500_fg structure 1545 * 1546 * Battery capacity calculation state machine for when we're discharging 1547 */ 1548static void ab8500_fg_algorithm_discharging(struct ab8500_fg *di) 1549{ 1550 int sleep_time; 1551 1552 /* If we change to charge mode we should start with init */ 1553 if (di->charge_state != AB8500_FG_CHARGE_INIT) 1554 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT); 1555 1556 switch (di->discharge_state) { 1557 case AB8500_FG_DISCHARGE_INIT: 1558 /* We use the FG IRQ to work on */ 1559 di->init_cnt = 0; 1560 di->fg_samples = SEC_TO_SAMPLE(di->bm->fg_params->init_timer); 1561 ab8500_fg_coulomb_counter(di, true); 1562 ab8500_fg_discharge_state_to(di, 1563 AB8500_FG_DISCHARGE_INITMEASURING); 1564 1565 fallthrough; 1566 case AB8500_FG_DISCHARGE_INITMEASURING: 1567 /* 1568 * Discard a number of samples during startup. 1569 * After that, use compensated voltage for a few 1570 * samples to get an initial capacity. 1571 * Then go to READOUT 1572 */ 1573 sleep_time = di->bm->fg_params->init_timer; 1574 1575 /* Discard the first [x] seconds */ 1576 if (di->init_cnt > di->bm->fg_params->init_discard_time) { 1577 ab8500_fg_calc_cap_discharge_voltage(di); 1578 1579 ab8500_fg_check_capacity_limits(di, true); 1580 } 1581 1582 di->init_cnt += sleep_time; 1583 if (di->init_cnt > di->bm->fg_params->init_total_time) 1584 ab8500_fg_discharge_state_to(di, 1585 AB8500_FG_DISCHARGE_READOUT_INIT); 1586 1587 break; 1588 1589 case AB8500_FG_DISCHARGE_INIT_RECOVERY: 1590 di->recovery_cnt = 0; 1591 di->recovery_needed = true; 1592 ab8500_fg_discharge_state_to(di, 1593 AB8500_FG_DISCHARGE_RECOVERY); 1594 1595 fallthrough; 1596 1597 case AB8500_FG_DISCHARGE_RECOVERY: 1598 sleep_time = di->bm->fg_params->recovery_sleep_timer; 1599 1600 /* 1601 * We should check the power consumption 1602 * If low, go to READOUT (after x min) or 1603 * RECOVERY_SLEEP if time left. 1604 * If high, go to READOUT 1605 */ 1606 di->inst_curr_ua = ab8500_fg_inst_curr_blocking(di); 1607 1608 if (ab8500_fg_is_low_curr(di, di->inst_curr_ua)) { 1609 if (di->recovery_cnt > 1610 di->bm->fg_params->recovery_total_time) { 1611 di->fg_samples = SEC_TO_SAMPLE( 1612 di->bm->fg_params->accu_high_curr); 1613 ab8500_fg_coulomb_counter(di, true); 1614 ab8500_fg_discharge_state_to(di, 1615 AB8500_FG_DISCHARGE_READOUT); 1616 di->recovery_needed = false; 1617 } else { 1618 queue_delayed_work(di->fg_wq, 1619 &di->fg_periodic_work, 1620 sleep_time * HZ); 1621 } 1622 di->recovery_cnt += sleep_time; 1623 } else { 1624 di->fg_samples = SEC_TO_SAMPLE( 1625 di->bm->fg_params->accu_high_curr); 1626 ab8500_fg_coulomb_counter(di, true); 1627 ab8500_fg_discharge_state_to(di, 1628 AB8500_FG_DISCHARGE_READOUT); 1629 } 1630 break; 1631 1632 case AB8500_FG_DISCHARGE_READOUT_INIT: 1633 di->fg_samples = SEC_TO_SAMPLE( 1634 di->bm->fg_params->accu_high_curr); 1635 ab8500_fg_coulomb_counter(di, true); 1636 ab8500_fg_discharge_state_to(di, 1637 AB8500_FG_DISCHARGE_READOUT); 1638 break; 1639 1640 case AB8500_FG_DISCHARGE_READOUT: 1641 di->inst_curr_ua = ab8500_fg_inst_curr_blocking(di); 1642 1643 if (ab8500_fg_is_low_curr(di, di->inst_curr_ua)) { 1644 /* Detect mode change */ 1645 if (di->high_curr_mode) { 1646 di->high_curr_mode = false; 1647 di->high_curr_cnt = 0; 1648 } 1649 1650 if (di->recovery_needed) { 1651 ab8500_fg_discharge_state_to(di, 1652 AB8500_FG_DISCHARGE_INIT_RECOVERY); 1653 1654 queue_delayed_work(di->fg_wq, 1655 &di->fg_periodic_work, 0); 1656 1657 break; 1658 } 1659 1660 ab8500_fg_calc_cap_discharge_voltage(di); 1661 } else { 1662 mutex_lock(&di->cc_lock); 1663 if (!di->flags.conv_done) { 1664 /* Wasn't the CC IRQ that got us here */ 1665 mutex_unlock(&di->cc_lock); 1666 dev_dbg(di->dev, "%s CC conv not done\n", 1667 __func__); 1668 1669 break; 1670 } 1671 di->flags.conv_done = false; 1672 mutex_unlock(&di->cc_lock); 1673 1674 /* Detect mode change */ 1675 if (!di->high_curr_mode) { 1676 di->high_curr_mode = true; 1677 di->high_curr_cnt = 0; 1678 } 1679 1680 di->high_curr_cnt += 1681 di->bm->fg_params->accu_high_curr; 1682 if (di->high_curr_cnt > 1683 di->bm->fg_params->high_curr_time) 1684 di->recovery_needed = true; 1685 1686 ab8500_fg_calc_cap_discharge_fg(di); 1687 } 1688 1689 ab8500_fg_check_capacity_limits(di, false); 1690 1691 break; 1692 1693 case AB8500_FG_DISCHARGE_WAKEUP: 1694 ab8500_fg_calc_cap_discharge_voltage(di); 1695 1696 di->fg_samples = SEC_TO_SAMPLE( 1697 di->bm->fg_params->accu_high_curr); 1698 ab8500_fg_coulomb_counter(di, true); 1699 ab8500_fg_discharge_state_to(di, 1700 AB8500_FG_DISCHARGE_READOUT); 1701 1702 ab8500_fg_check_capacity_limits(di, false); 1703 1704 break; 1705 1706 default: 1707 break; 1708 } 1709} 1710 1711/** 1712 * ab8500_fg_algorithm_calibrate() - Internal columb counter offset calibration 1713 * @di: pointer to the ab8500_fg structure 1714 * 1715 */ 1716static void ab8500_fg_algorithm_calibrate(struct ab8500_fg *di) 1717{ 1718 int ret; 1719 1720 switch (di->calib_state) { 1721 case AB8500_FG_CALIB_INIT: 1722 dev_dbg(di->dev, "Calibration ongoing...\n"); 1723 1724 ret = abx500_mask_and_set_register_interruptible(di->dev, 1725 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 1726 CC_INT_CAL_N_AVG_MASK, CC_INT_CAL_SAMPLES_8); 1727 if (ret < 0) 1728 goto err; 1729 1730 ret = abx500_mask_and_set_register_interruptible(di->dev, 1731 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 1732 CC_INTAVGOFFSET_ENA, CC_INTAVGOFFSET_ENA); 1733 if (ret < 0) 1734 goto err; 1735 di->calib_state = AB8500_FG_CALIB_WAIT; 1736 break; 1737 case AB8500_FG_CALIB_END: 1738 ret = abx500_mask_and_set_register_interruptible(di->dev, 1739 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 1740 CC_MUXOFFSET, CC_MUXOFFSET); 1741 if (ret < 0) 1742 goto err; 1743 di->flags.calibrate = false; 1744 dev_dbg(di->dev, "Calibration done...\n"); 1745 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); 1746 break; 1747 case AB8500_FG_CALIB_WAIT: 1748 dev_dbg(di->dev, "Calibration WFI\n"); 1749 break; 1750 default: 1751 break; 1752 } 1753 return; 1754err: 1755 /* Something went wrong, don't calibrate then */ 1756 dev_err(di->dev, "failed to calibrate the CC\n"); 1757 di->flags.calibrate = false; 1758 di->calib_state = AB8500_FG_CALIB_INIT; 1759 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); 1760} 1761 1762/** 1763 * ab8500_fg_algorithm() - Entry point for the FG algorithm 1764 * @di: pointer to the ab8500_fg structure 1765 * 1766 * Entry point for the battery capacity calculation state machine 1767 */ 1768static void ab8500_fg_algorithm(struct ab8500_fg *di) 1769{ 1770 if (di->flags.calibrate) 1771 ab8500_fg_algorithm_calibrate(di); 1772 else { 1773 if (di->flags.charging) 1774 ab8500_fg_algorithm_charging(di); 1775 else 1776 ab8500_fg_algorithm_discharging(di); 1777 } 1778 1779 dev_dbg(di->dev, "[FG_DATA] %d %d %d %d %d %d %d %d %d %d " 1780 "%d %d %d %d %d %d %d\n", 1781 di->bat_cap.max_mah_design, 1782 di->bat_cap.max_mah, 1783 di->bat_cap.mah, 1784 di->bat_cap.permille, 1785 di->bat_cap.level, 1786 di->bat_cap.prev_mah, 1787 di->bat_cap.prev_percent, 1788 di->bat_cap.prev_level, 1789 di->vbat_uv, 1790 di->inst_curr_ua, 1791 di->avg_curr_ua, 1792 di->accu_charge, 1793 di->flags.charging, 1794 di->charge_state, 1795 di->discharge_state, 1796 di->high_curr_mode, 1797 di->recovery_needed); 1798} 1799 1800/** 1801 * ab8500_fg_periodic_work() - Run the FG state machine periodically 1802 * @work: pointer to the work_struct structure 1803 * 1804 * Work queue function for periodic work 1805 */ 1806static void ab8500_fg_periodic_work(struct work_struct *work) 1807{ 1808 struct ab8500_fg *di = container_of(work, struct ab8500_fg, 1809 fg_periodic_work.work); 1810 1811 if (di->init_capacity) { 1812 /* Get an initial capacity calculation */ 1813 ab8500_fg_calc_cap_discharge_voltage(di); 1814 ab8500_fg_check_capacity_limits(di, true); 1815 di->init_capacity = false; 1816 1817 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); 1818 } else if (di->flags.user_cap) { 1819 if (check_sysfs_capacity(di)) { 1820 ab8500_fg_check_capacity_limits(di, true); 1821 if (di->flags.charging) 1822 ab8500_fg_charge_state_to(di, 1823 AB8500_FG_CHARGE_INIT); 1824 else 1825 ab8500_fg_discharge_state_to(di, 1826 AB8500_FG_DISCHARGE_READOUT_INIT); 1827 } 1828 di->flags.user_cap = false; 1829 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); 1830 } else 1831 ab8500_fg_algorithm(di); 1832 1833} 1834 1835/** 1836 * ab8500_fg_check_hw_failure_work() - Check OVV_BAT condition 1837 * @work: pointer to the work_struct structure 1838 * 1839 * Work queue function for checking the OVV_BAT condition 1840 */ 1841static void ab8500_fg_check_hw_failure_work(struct work_struct *work) 1842{ 1843 int ret; 1844 u8 reg_value; 1845 1846 struct ab8500_fg *di = container_of(work, struct ab8500_fg, 1847 fg_check_hw_failure_work.work); 1848 1849 /* 1850 * If we have had a battery over-voltage situation, 1851 * check ovv-bit to see if it should be reset. 1852 */ 1853 ret = abx500_get_register_interruptible(di->dev, 1854 AB8500_CHARGER, AB8500_CH_STAT_REG, 1855 ®_value); 1856 if (ret < 0) { 1857 dev_err(di->dev, "%s ab8500 read failed\n", __func__); 1858 return; 1859 } 1860 if ((reg_value & BATT_OVV) == BATT_OVV) { 1861 if (!di->flags.bat_ovv) { 1862 dev_dbg(di->dev, "Battery OVV\n"); 1863 di->flags.bat_ovv = true; 1864 power_supply_changed(di->fg_psy); 1865 } 1866 /* Not yet recovered from ovv, reschedule this test */ 1867 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, 1868 HZ); 1869 } else { 1870 dev_dbg(di->dev, "Battery recovered from OVV\n"); 1871 di->flags.bat_ovv = false; 1872 power_supply_changed(di->fg_psy); 1873 } 1874} 1875 1876/** 1877 * ab8500_fg_low_bat_work() - Check LOW_BAT condition 1878 * @work: pointer to the work_struct structure 1879 * 1880 * Work queue function for checking the LOW_BAT condition 1881 */ 1882static void ab8500_fg_low_bat_work(struct work_struct *work) 1883{ 1884 int vbat_uv; 1885 1886 struct ab8500_fg *di = container_of(work, struct ab8500_fg, 1887 fg_low_bat_work.work); 1888 1889 vbat_uv = ab8500_fg_bat_voltage(di); 1890 1891 /* Check if LOW_BAT still fulfilled */ 1892 if (vbat_uv < di->bm->fg_params->lowbat_threshold_uv) { 1893 /* Is it time to shut down? */ 1894 if (di->low_bat_cnt < 1) { 1895 di->flags.low_bat = true; 1896 dev_warn(di->dev, "Shut down pending...\n"); 1897 } else { 1898 /* 1899 * Else we need to re-schedule this check to be able to detect 1900 * if the voltage increases again during charging or 1901 * due to decreasing load. 1902 */ 1903 di->low_bat_cnt--; 1904 dev_warn(di->dev, "Battery voltage still LOW\n"); 1905 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work, 1906 round_jiffies(LOW_BAT_CHECK_INTERVAL)); 1907 } 1908 } else { 1909 di->flags.low_bat_delay = false; 1910 di->low_bat_cnt = 10; 1911 dev_warn(di->dev, "Battery voltage OK again\n"); 1912 } 1913 1914 /* This is needed to dispatch LOW_BAT */ 1915 ab8500_fg_check_capacity_limits(di, false); 1916} 1917 1918/** 1919 * ab8500_fg_battok_calc - calculate the bit pattern corresponding 1920 * to the target voltage. 1921 * @di: pointer to the ab8500_fg structure 1922 * @target: target voltage 1923 * 1924 * Returns bit pattern closest to the target voltage 1925 * valid return values are 0-14. (0-BATT_OK_MAX_NR_INCREMENTS) 1926 */ 1927 1928static int ab8500_fg_battok_calc(struct ab8500_fg *di, int target) 1929{ 1930 if (target > BATT_OK_MIN + 1931 (BATT_OK_INCREMENT * BATT_OK_MAX_NR_INCREMENTS)) 1932 return BATT_OK_MAX_NR_INCREMENTS; 1933 if (target < BATT_OK_MIN) 1934 return 0; 1935 return (target - BATT_OK_MIN) / BATT_OK_INCREMENT; 1936} 1937 1938/** 1939 * ab8500_fg_battok_init_hw_register - init battok levels 1940 * @di: pointer to the ab8500_fg structure 1941 * 1942 */ 1943 1944static int ab8500_fg_battok_init_hw_register(struct ab8500_fg *di) 1945{ 1946 int selected; 1947 int sel0; 1948 int sel1; 1949 int cbp_sel0; 1950 int cbp_sel1; 1951 int ret; 1952 int new_val; 1953 1954 sel0 = di->bm->fg_params->battok_falling_th_sel0; 1955 sel1 = di->bm->fg_params->battok_raising_th_sel1; 1956 1957 cbp_sel0 = ab8500_fg_battok_calc(di, sel0); 1958 cbp_sel1 = ab8500_fg_battok_calc(di, sel1); 1959 1960 selected = BATT_OK_MIN + cbp_sel0 * BATT_OK_INCREMENT; 1961 1962 if (selected != sel0) 1963 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n", 1964 sel0, selected, cbp_sel0); 1965 1966 selected = BATT_OK_MIN + cbp_sel1 * BATT_OK_INCREMENT; 1967 1968 if (selected != sel1) 1969 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n", 1970 sel1, selected, cbp_sel1); 1971 1972 new_val = cbp_sel0 | (cbp_sel1 << 4); 1973 1974 dev_dbg(di->dev, "using: %x %d %d\n", new_val, cbp_sel0, cbp_sel1); 1975 ret = abx500_set_register_interruptible(di->dev, AB8500_SYS_CTRL2_BLOCK, 1976 AB8500_BATT_OK_REG, new_val); 1977 return ret; 1978} 1979 1980/** 1981 * ab8500_fg_instant_work() - Run the FG state machine instantly 1982 * @work: pointer to the work_struct structure 1983 * 1984 * Work queue function for instant work 1985 */ 1986static void ab8500_fg_instant_work(struct work_struct *work) 1987{ 1988 struct ab8500_fg *di = container_of(work, struct ab8500_fg, fg_work); 1989 1990 ab8500_fg_algorithm(di); 1991} 1992 1993/** 1994 * ab8500_fg_cc_data_end_handler() - end of data conversion isr. 1995 * @irq: interrupt number 1996 * @_di: pointer to the ab8500_fg structure 1997 * 1998 * Returns IRQ status(IRQ_HANDLED) 1999 */ 2000static irqreturn_t ab8500_fg_cc_data_end_handler(int irq, void *_di) 2001{ 2002 struct ab8500_fg *di = _di; 2003 if (!di->nbr_cceoc_irq_cnt) { 2004 di->nbr_cceoc_irq_cnt++; 2005 complete(&di->ab8500_fg_started); 2006 } else { 2007 di->nbr_cceoc_irq_cnt = 0; 2008 complete(&di->ab8500_fg_complete); 2009 } 2010 return IRQ_HANDLED; 2011} 2012 2013/** 2014 * ab8500_fg_cc_int_calib_handler () - end of calibration isr. 2015 * @irq: interrupt number 2016 * @_di: pointer to the ab8500_fg structure 2017 * 2018 * Returns IRQ status(IRQ_HANDLED) 2019 */ 2020static irqreturn_t ab8500_fg_cc_int_calib_handler(int irq, void *_di) 2021{ 2022 struct ab8500_fg *di = _di; 2023 di->calib_state = AB8500_FG_CALIB_END; 2024 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); 2025 return IRQ_HANDLED; 2026} 2027 2028/** 2029 * ab8500_fg_cc_convend_handler() - isr to get battery avg current. 2030 * @irq: interrupt number 2031 * @_di: pointer to the ab8500_fg structure 2032 * 2033 * Returns IRQ status(IRQ_HANDLED) 2034 */ 2035static irqreturn_t ab8500_fg_cc_convend_handler(int irq, void *_di) 2036{ 2037 struct ab8500_fg *di = _di; 2038 2039 queue_work(di->fg_wq, &di->fg_acc_cur_work); 2040 2041 return IRQ_HANDLED; 2042} 2043 2044/** 2045 * ab8500_fg_batt_ovv_handler() - Battery OVV occured 2046 * @irq: interrupt number 2047 * @_di: pointer to the ab8500_fg structure 2048 * 2049 * Returns IRQ status(IRQ_HANDLED) 2050 */ 2051static irqreturn_t ab8500_fg_batt_ovv_handler(int irq, void *_di) 2052{ 2053 struct ab8500_fg *di = _di; 2054 2055 dev_dbg(di->dev, "Battery OVV\n"); 2056 2057 /* Schedule a new HW failure check */ 2058 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, 0); 2059 2060 return IRQ_HANDLED; 2061} 2062 2063/** 2064 * ab8500_fg_lowbatf_handler() - Battery voltage is below LOW threshold 2065 * @irq: interrupt number 2066 * @_di: pointer to the ab8500_fg structure 2067 * 2068 * Returns IRQ status(IRQ_HANDLED) 2069 */ 2070static irqreturn_t ab8500_fg_lowbatf_handler(int irq, void *_di) 2071{ 2072 struct ab8500_fg *di = _di; 2073 2074 /* Initiate handling in ab8500_fg_low_bat_work() if not already initiated. */ 2075 if (!di->flags.low_bat_delay) { 2076 dev_warn(di->dev, "Battery voltage is below LOW threshold\n"); 2077 di->flags.low_bat_delay = true; 2078 /* 2079 * Start a timer to check LOW_BAT again after some time 2080 * This is done to avoid shutdown on single voltage dips 2081 */ 2082 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work, 2083 round_jiffies(LOW_BAT_CHECK_INTERVAL)); 2084 } 2085 return IRQ_HANDLED; 2086} 2087 2088/** 2089 * ab8500_fg_get_property() - get the fg properties 2090 * @psy: pointer to the power_supply structure 2091 * @psp: pointer to the power_supply_property structure 2092 * @val: pointer to the power_supply_propval union 2093 * 2094 * This function gets called when an application tries to get the 2095 * fg properties by reading the sysfs files. 2096 * voltage_now: battery voltage 2097 * current_now: battery instant current 2098 * current_avg: battery average current 2099 * charge_full_design: capacity where battery is considered full 2100 * charge_now: battery capacity in nAh 2101 * capacity: capacity in percent 2102 * capacity_level: capacity level 2103 * 2104 * Returns error code in case of failure else 0 on success 2105 */ 2106static int ab8500_fg_get_property(struct power_supply *psy, 2107 enum power_supply_property psp, 2108 union power_supply_propval *val) 2109{ 2110 struct ab8500_fg *di = power_supply_get_drvdata(psy); 2111 2112 /* 2113 * If battery is identified as unknown and charging of unknown 2114 * batteries is disabled, we always report 100% capacity and 2115 * capacity level UNKNOWN, since we can't calculate 2116 * remaining capacity 2117 */ 2118 2119 switch (psp) { 2120 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 2121 if (di->flags.bat_ovv) 2122 val->intval = BATT_OVV_VALUE; 2123 else 2124 val->intval = di->vbat_uv; 2125 break; 2126 case POWER_SUPPLY_PROP_CURRENT_NOW: 2127 val->intval = di->inst_curr_ua; 2128 break; 2129 case POWER_SUPPLY_PROP_CURRENT_AVG: 2130 val->intval = di->avg_curr_ua; 2131 break; 2132 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 2133 val->intval = ab8500_fg_convert_mah_to_uwh(di, 2134 di->bat_cap.max_mah_design); 2135 break; 2136 case POWER_SUPPLY_PROP_ENERGY_FULL: 2137 val->intval = ab8500_fg_convert_mah_to_uwh(di, 2138 di->bat_cap.max_mah); 2139 break; 2140 case POWER_SUPPLY_PROP_ENERGY_NOW: 2141 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat && 2142 di->flags.batt_id_received) 2143 val->intval = ab8500_fg_convert_mah_to_uwh(di, 2144 di->bat_cap.max_mah); 2145 else 2146 val->intval = ab8500_fg_convert_mah_to_uwh(di, 2147 di->bat_cap.prev_mah); 2148 break; 2149 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 2150 val->intval = di->bat_cap.max_mah_design; 2151 break; 2152 case POWER_SUPPLY_PROP_CHARGE_FULL: 2153 val->intval = di->bat_cap.max_mah; 2154 break; 2155 case POWER_SUPPLY_PROP_CHARGE_NOW: 2156 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat && 2157 di->flags.batt_id_received) 2158 val->intval = di->bat_cap.max_mah; 2159 else 2160 val->intval = di->bat_cap.prev_mah; 2161 break; 2162 case POWER_SUPPLY_PROP_CAPACITY: 2163 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat && 2164 di->flags.batt_id_received) 2165 val->intval = 100; 2166 else 2167 val->intval = di->bat_cap.prev_percent; 2168 break; 2169 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 2170 if (di->flags.batt_unknown && !di->bm->chg_unknown_bat && 2171 di->flags.batt_id_received) 2172 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN; 2173 else 2174 val->intval = di->bat_cap.prev_level; 2175 break; 2176 default: 2177 return -EINVAL; 2178 } 2179 return 0; 2180} 2181 2182static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data) 2183{ 2184 struct power_supply *psy; 2185 struct power_supply *ext = dev_get_drvdata(dev); 2186 const char **supplicants = (const char **)ext->supplied_to; 2187 struct ab8500_fg *di; 2188 struct power_supply_battery_info *bi; 2189 union power_supply_propval ret; 2190 int j; 2191 2192 psy = (struct power_supply *)data; 2193 di = power_supply_get_drvdata(psy); 2194 bi = di->bm->bi; 2195 2196 /* 2197 * For all psy where the name of your driver 2198 * appears in any supplied_to 2199 */ 2200 j = match_string(supplicants, ext->num_supplicants, psy->desc->name); 2201 if (j < 0) 2202 return 0; 2203 2204 /* Go through all properties for the psy */ 2205 for (j = 0; j < ext->desc->num_properties; j++) { 2206 enum power_supply_property prop; 2207 prop = ext->desc->properties[j]; 2208 2209 if (power_supply_get_property(ext, prop, &ret)) 2210 continue; 2211 2212 switch (prop) { 2213 case POWER_SUPPLY_PROP_STATUS: 2214 switch (ext->desc->type) { 2215 case POWER_SUPPLY_TYPE_BATTERY: 2216 switch (ret.intval) { 2217 case POWER_SUPPLY_STATUS_UNKNOWN: 2218 case POWER_SUPPLY_STATUS_DISCHARGING: 2219 case POWER_SUPPLY_STATUS_NOT_CHARGING: 2220 if (!di->flags.charging) 2221 break; 2222 di->flags.charging = false; 2223 di->flags.fully_charged = false; 2224 if (di->bm->capacity_scaling) 2225 ab8500_fg_update_cap_scalers(di); 2226 queue_work(di->fg_wq, &di->fg_work); 2227 break; 2228 case POWER_SUPPLY_STATUS_FULL: 2229 if (di->flags.fully_charged) 2230 break; 2231 di->flags.fully_charged = true; 2232 di->flags.force_full = true; 2233 /* Save current capacity as maximum */ 2234 di->bat_cap.max_mah = di->bat_cap.mah; 2235 queue_work(di->fg_wq, &di->fg_work); 2236 break; 2237 case POWER_SUPPLY_STATUS_CHARGING: 2238 if (di->flags.charging && 2239 !di->flags.fully_charged) 2240 break; 2241 di->flags.charging = true; 2242 di->flags.fully_charged = false; 2243 if (di->bm->capacity_scaling) 2244 ab8500_fg_update_cap_scalers(di); 2245 queue_work(di->fg_wq, &di->fg_work); 2246 break; 2247 } 2248 break; 2249 default: 2250 break; 2251 } 2252 break; 2253 case POWER_SUPPLY_PROP_TECHNOLOGY: 2254 switch (ext->desc->type) { 2255 case POWER_SUPPLY_TYPE_BATTERY: 2256 if (!di->flags.batt_id_received && 2257 (bi && (bi->technology != 2258 POWER_SUPPLY_TECHNOLOGY_UNKNOWN))) { 2259 di->flags.batt_id_received = true; 2260 2261 di->bat_cap.max_mah_design = 2262 di->bm->bi->charge_full_design_uah; 2263 2264 di->bat_cap.max_mah = 2265 di->bat_cap.max_mah_design; 2266 2267 di->vbat_nom_uv = 2268 di->bm->bi->voltage_max_design_uv; 2269 } 2270 2271 if (ret.intval) 2272 di->flags.batt_unknown = false; 2273 else 2274 di->flags.batt_unknown = true; 2275 break; 2276 default: 2277 break; 2278 } 2279 break; 2280 case POWER_SUPPLY_PROP_TEMP: 2281 switch (ext->desc->type) { 2282 case POWER_SUPPLY_TYPE_BATTERY: 2283 if (di->flags.batt_id_received) 2284 di->bat_temp = ret.intval; 2285 break; 2286 default: 2287 break; 2288 } 2289 break; 2290 default: 2291 break; 2292 } 2293 } 2294 return 0; 2295} 2296 2297/** 2298 * ab8500_fg_init_hw_registers() - Set up FG related registers 2299 * @di: pointer to the ab8500_fg structure 2300 * 2301 * Set up battery OVV, low battery voltage registers 2302 */ 2303static int ab8500_fg_init_hw_registers(struct ab8500_fg *di) 2304{ 2305 int ret; 2306 2307 /* 2308 * Set VBAT OVV (overvoltage) threshold to 4.75V (typ) this is what 2309 * the hardware supports, nothing else can be configured in hardware. 2310 * See this as an "outer limit" where the charger will certainly 2311 * shut down. Other (lower) overvoltage levels need to be implemented 2312 * in software. 2313 */ 2314 ret = abx500_mask_and_set_register_interruptible(di->dev, 2315 AB8500_CHARGER, 2316 AB8500_BATT_OVV, 2317 BATT_OVV_TH_4P75, 2318 BATT_OVV_TH_4P75); 2319 if (ret) { 2320 dev_err(di->dev, "failed to set BATT_OVV\n"); 2321 goto out; 2322 } 2323 2324 /* Enable VBAT OVV detection */ 2325 ret = abx500_mask_and_set_register_interruptible(di->dev, 2326 AB8500_CHARGER, 2327 AB8500_BATT_OVV, 2328 BATT_OVV_ENA, 2329 BATT_OVV_ENA); 2330 if (ret) { 2331 dev_err(di->dev, "failed to enable BATT_OVV\n"); 2332 goto out; 2333 } 2334 2335 /* Low Battery Voltage */ 2336 ret = abx500_set_register_interruptible(di->dev, 2337 AB8500_SYS_CTRL2_BLOCK, 2338 AB8500_LOW_BAT_REG, 2339 ab8500_volt_to_regval( 2340 di->bm->fg_params->lowbat_threshold_uv) << 1 | 2341 LOW_BAT_ENABLE); 2342 if (ret) { 2343 dev_err(di->dev, "%s write failed\n", __func__); 2344 goto out; 2345 } 2346 2347 /* Battery OK threshold */ 2348 ret = ab8500_fg_battok_init_hw_register(di); 2349 if (ret) { 2350 dev_err(di->dev, "BattOk init write failed.\n"); 2351 goto out; 2352 } 2353 2354 if (is_ab8505(di->parent)) { 2355 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, 2356 AB8505_RTC_PCUT_MAX_TIME_REG, di->bm->fg_params->pcut_max_time); 2357 2358 if (ret) { 2359 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_MAX_TIME_REG\n", __func__); 2360 goto out; 2361 } 2362 2363 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, 2364 AB8505_RTC_PCUT_FLAG_TIME_REG, di->bm->fg_params->pcut_flag_time); 2365 2366 if (ret) { 2367 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_FLAG_TIME_REG\n", __func__); 2368 goto out; 2369 } 2370 2371 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, 2372 AB8505_RTC_PCUT_RESTART_REG, di->bm->fg_params->pcut_max_restart); 2373 2374 if (ret) { 2375 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_RESTART_REG\n", __func__); 2376 goto out; 2377 } 2378 2379 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, 2380 AB8505_RTC_PCUT_DEBOUNCE_REG, di->bm->fg_params->pcut_debounce_time); 2381 2382 if (ret) { 2383 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_DEBOUNCE_REG\n", __func__); 2384 goto out; 2385 } 2386 2387 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, 2388 AB8505_RTC_PCUT_CTL_STATUS_REG, di->bm->fg_params->pcut_enable); 2389 2390 if (ret) { 2391 dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_CTL_STATUS_REG\n", __func__); 2392 goto out; 2393 } 2394 } 2395out: 2396 return ret; 2397} 2398 2399/** 2400 * ab8500_fg_external_power_changed() - callback for power supply changes 2401 * @psy: pointer to the structure power_supply 2402 * 2403 * This function is the entry point of the pointer external_power_changed 2404 * of the structure power_supply. 2405 * This function gets executed when there is a change in any external power 2406 * supply that this driver needs to be notified of. 2407 */ 2408static void ab8500_fg_external_power_changed(struct power_supply *psy) 2409{ 2410 power_supply_for_each_device(psy, ab8500_fg_get_ext_psy_data); 2411} 2412 2413/** 2414 * ab8500_fg_reinit_work() - work to reset the FG algorithm 2415 * @work: pointer to the work_struct structure 2416 * 2417 * Used to reset the current battery capacity to be able to 2418 * retrigger a new voltage base capacity calculation. For 2419 * test and verification purpose. 2420 */ 2421static void ab8500_fg_reinit_work(struct work_struct *work) 2422{ 2423 struct ab8500_fg *di = container_of(work, struct ab8500_fg, 2424 fg_reinit_work.work); 2425 2426 if (!di->flags.calibrate) { 2427 dev_dbg(di->dev, "Resetting FG state machine to init.\n"); 2428 ab8500_fg_clear_cap_samples(di); 2429 ab8500_fg_calc_cap_discharge_voltage(di); 2430 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT); 2431 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT); 2432 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); 2433 2434 } else { 2435 dev_err(di->dev, "Residual offset calibration ongoing " 2436 "retrying..\n"); 2437 /* Wait one second until next try*/ 2438 queue_delayed_work(di->fg_wq, &di->fg_reinit_work, 2439 round_jiffies(1)); 2440 } 2441} 2442 2443/* Exposure to the sysfs interface */ 2444 2445struct ab8500_fg_sysfs_entry { 2446 struct attribute attr; 2447 ssize_t (*show)(struct ab8500_fg *, char *); 2448 ssize_t (*store)(struct ab8500_fg *, const char *, size_t); 2449}; 2450 2451static ssize_t charge_full_show(struct ab8500_fg *di, char *buf) 2452{ 2453 return sysfs_emit(buf, "%d\n", di->bat_cap.max_mah); 2454} 2455 2456static ssize_t charge_full_store(struct ab8500_fg *di, const char *buf, 2457 size_t count) 2458{ 2459 unsigned long charge_full; 2460 int ret; 2461 2462 ret = kstrtoul(buf, 10, &charge_full); 2463 if (ret) 2464 return ret; 2465 2466 di->bat_cap.max_mah = (int) charge_full; 2467 return count; 2468} 2469 2470static ssize_t charge_now_show(struct ab8500_fg *di, char *buf) 2471{ 2472 return sysfs_emit(buf, "%d\n", di->bat_cap.prev_mah); 2473} 2474 2475static ssize_t charge_now_store(struct ab8500_fg *di, const char *buf, 2476 size_t count) 2477{ 2478 unsigned long charge_now; 2479 int ret; 2480 2481 ret = kstrtoul(buf, 10, &charge_now); 2482 if (ret) 2483 return ret; 2484 2485 di->bat_cap.user_mah = (int) charge_now; 2486 di->flags.user_cap = true; 2487 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); 2488 return count; 2489} 2490 2491static struct ab8500_fg_sysfs_entry charge_full_attr = 2492 __ATTR(charge_full, 0644, charge_full_show, charge_full_store); 2493 2494static struct ab8500_fg_sysfs_entry charge_now_attr = 2495 __ATTR(charge_now, 0644, charge_now_show, charge_now_store); 2496 2497static ssize_t 2498ab8500_fg_show(struct kobject *kobj, struct attribute *attr, char *buf) 2499{ 2500 struct ab8500_fg_sysfs_entry *entry; 2501 struct ab8500_fg *di; 2502 2503 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr); 2504 di = container_of(kobj, struct ab8500_fg, fg_kobject); 2505 2506 if (!entry->show) 2507 return -EIO; 2508 2509 return entry->show(di, buf); 2510} 2511static ssize_t 2512ab8500_fg_store(struct kobject *kobj, struct attribute *attr, const char *buf, 2513 size_t count) 2514{ 2515 struct ab8500_fg_sysfs_entry *entry; 2516 struct ab8500_fg *di; 2517 2518 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr); 2519 di = container_of(kobj, struct ab8500_fg, fg_kobject); 2520 2521 if (!entry->store) 2522 return -EIO; 2523 2524 return entry->store(di, buf, count); 2525} 2526 2527static const struct sysfs_ops ab8500_fg_sysfs_ops = { 2528 .show = ab8500_fg_show, 2529 .store = ab8500_fg_store, 2530}; 2531 2532static struct attribute *ab8500_fg_attrs[] = { 2533 &charge_full_attr.attr, 2534 &charge_now_attr.attr, 2535 NULL, 2536}; 2537ATTRIBUTE_GROUPS(ab8500_fg); 2538 2539static struct kobj_type ab8500_fg_ktype = { 2540 .sysfs_ops = &ab8500_fg_sysfs_ops, 2541 .default_groups = ab8500_fg_groups, 2542}; 2543 2544/** 2545 * ab8500_fg_sysfs_exit() - de-init of sysfs entry 2546 * @di: pointer to the struct ab8500_chargalg 2547 * 2548 * This function removes the entry in sysfs. 2549 */ 2550static void ab8500_fg_sysfs_exit(struct ab8500_fg *di) 2551{ 2552 kobject_del(&di->fg_kobject); 2553} 2554 2555/** 2556 * ab8500_fg_sysfs_init() - init of sysfs entry 2557 * @di: pointer to the struct ab8500_chargalg 2558 * 2559 * This function adds an entry in sysfs. 2560 * Returns error code in case of failure else 0(on success) 2561 */ 2562static int ab8500_fg_sysfs_init(struct ab8500_fg *di) 2563{ 2564 int ret = 0; 2565 2566 ret = kobject_init_and_add(&di->fg_kobject, 2567 &ab8500_fg_ktype, 2568 NULL, "battery"); 2569 if (ret < 0) { 2570 kobject_put(&di->fg_kobject); 2571 dev_err(di->dev, "failed to create sysfs entry\n"); 2572 } 2573 2574 return ret; 2575} 2576 2577static ssize_t ab8505_powercut_flagtime_read(struct device *dev, 2578 struct device_attribute *attr, 2579 char *buf) 2580{ 2581 int ret; 2582 u8 reg_value; 2583 struct power_supply *psy = dev_get_drvdata(dev); 2584 struct ab8500_fg *di = power_supply_get_drvdata(psy); 2585 2586 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, 2587 AB8505_RTC_PCUT_FLAG_TIME_REG, ®_value); 2588 2589 if (ret < 0) { 2590 dev_err(dev, "Failed to read AB8505_RTC_PCUT_FLAG_TIME_REG\n"); 2591 goto fail; 2592 } 2593 2594 return sysfs_emit(buf, "%d\n", (reg_value & 0x7F)); 2595 2596fail: 2597 return ret; 2598} 2599 2600static ssize_t ab8505_powercut_flagtime_write(struct device *dev, 2601 struct device_attribute *attr, 2602 const char *buf, size_t count) 2603{ 2604 int ret; 2605 int reg_value; 2606 struct power_supply *psy = dev_get_drvdata(dev); 2607 struct ab8500_fg *di = power_supply_get_drvdata(psy); 2608 2609 if (kstrtoint(buf, 10, ®_value)) 2610 goto fail; 2611 2612 if (reg_value > 0x7F) { 2613 dev_err(dev, "Incorrect parameter, echo 0 (1.98s) - 127 (15.625ms) for flagtime\n"); 2614 goto fail; 2615 } 2616 2617 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, 2618 AB8505_RTC_PCUT_FLAG_TIME_REG, (u8)reg_value); 2619 2620 if (ret < 0) 2621 dev_err(dev, "Failed to set AB8505_RTC_PCUT_FLAG_TIME_REG\n"); 2622 2623fail: 2624 return count; 2625} 2626 2627static ssize_t ab8505_powercut_maxtime_read(struct device *dev, 2628 struct device_attribute *attr, 2629 char *buf) 2630{ 2631 int ret; 2632 u8 reg_value; 2633 struct power_supply *psy = dev_get_drvdata(dev); 2634 struct ab8500_fg *di = power_supply_get_drvdata(psy); 2635 2636 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, 2637 AB8505_RTC_PCUT_MAX_TIME_REG, ®_value); 2638 2639 if (ret < 0) { 2640 dev_err(dev, "Failed to read AB8505_RTC_PCUT_MAX_TIME_REG\n"); 2641 goto fail; 2642 } 2643 2644 return sysfs_emit(buf, "%d\n", (reg_value & 0x7F)); 2645 2646fail: 2647 return ret; 2648 2649} 2650 2651static ssize_t ab8505_powercut_maxtime_write(struct device *dev, 2652 struct device_attribute *attr, 2653 const char *buf, size_t count) 2654{ 2655 int ret; 2656 int reg_value; 2657 struct power_supply *psy = dev_get_drvdata(dev); 2658 struct ab8500_fg *di = power_supply_get_drvdata(psy); 2659 2660 if (kstrtoint(buf, 10, ®_value)) 2661 goto fail; 2662 2663 if (reg_value > 0x7F) { 2664 dev_err(dev, "Incorrect parameter, echo 0 (0.0s) - 127 (1.98s) for maxtime\n"); 2665 goto fail; 2666 } 2667 2668 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, 2669 AB8505_RTC_PCUT_MAX_TIME_REG, (u8)reg_value); 2670 2671 if (ret < 0) 2672 dev_err(dev, "Failed to set AB8505_RTC_PCUT_MAX_TIME_REG\n"); 2673 2674fail: 2675 return count; 2676} 2677 2678static ssize_t ab8505_powercut_restart_read(struct device *dev, 2679 struct device_attribute *attr, 2680 char *buf) 2681{ 2682 int ret; 2683 u8 reg_value; 2684 struct power_supply *psy = dev_get_drvdata(dev); 2685 struct ab8500_fg *di = power_supply_get_drvdata(psy); 2686 2687 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, 2688 AB8505_RTC_PCUT_RESTART_REG, ®_value); 2689 2690 if (ret < 0) { 2691 dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n"); 2692 goto fail; 2693 } 2694 2695 return sysfs_emit(buf, "%d\n", (reg_value & 0xF)); 2696 2697fail: 2698 return ret; 2699} 2700 2701static ssize_t ab8505_powercut_restart_write(struct device *dev, 2702 struct device_attribute *attr, 2703 const char *buf, size_t count) 2704{ 2705 int ret; 2706 int reg_value; 2707 struct power_supply *psy = dev_get_drvdata(dev); 2708 struct ab8500_fg *di = power_supply_get_drvdata(psy); 2709 2710 if (kstrtoint(buf, 10, ®_value)) 2711 goto fail; 2712 2713 if (reg_value > 0xF) { 2714 dev_err(dev, "Incorrect parameter, echo 0 - 15 for number of restart\n"); 2715 goto fail; 2716 } 2717 2718 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, 2719 AB8505_RTC_PCUT_RESTART_REG, (u8)reg_value); 2720 2721 if (ret < 0) 2722 dev_err(dev, "Failed to set AB8505_RTC_PCUT_RESTART_REG\n"); 2723 2724fail: 2725 return count; 2726 2727} 2728 2729static ssize_t ab8505_powercut_timer_read(struct device *dev, 2730 struct device_attribute *attr, 2731 char *buf) 2732{ 2733 int ret; 2734 u8 reg_value; 2735 struct power_supply *psy = dev_get_drvdata(dev); 2736 struct ab8500_fg *di = power_supply_get_drvdata(psy); 2737 2738 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, 2739 AB8505_RTC_PCUT_TIME_REG, ®_value); 2740 2741 if (ret < 0) { 2742 dev_err(dev, "Failed to read AB8505_RTC_PCUT_TIME_REG\n"); 2743 goto fail; 2744 } 2745 2746 return sysfs_emit(buf, "%d\n", (reg_value & 0x7F)); 2747 2748fail: 2749 return ret; 2750} 2751 2752static ssize_t ab8505_powercut_restart_counter_read(struct device *dev, 2753 struct device_attribute *attr, 2754 char *buf) 2755{ 2756 int ret; 2757 u8 reg_value; 2758 struct power_supply *psy = dev_get_drvdata(dev); 2759 struct ab8500_fg *di = power_supply_get_drvdata(psy); 2760 2761 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, 2762 AB8505_RTC_PCUT_RESTART_REG, ®_value); 2763 2764 if (ret < 0) { 2765 dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n"); 2766 goto fail; 2767 } 2768 2769 return sysfs_emit(buf, "%d\n", (reg_value & 0xF0) >> 4); 2770 2771fail: 2772 return ret; 2773} 2774 2775static ssize_t ab8505_powercut_read(struct device *dev, 2776 struct device_attribute *attr, 2777 char *buf) 2778{ 2779 int ret; 2780 u8 reg_value; 2781 struct power_supply *psy = dev_get_drvdata(dev); 2782 struct ab8500_fg *di = power_supply_get_drvdata(psy); 2783 2784 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, 2785 AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value); 2786 2787 if (ret < 0) 2788 goto fail; 2789 2790 return sysfs_emit(buf, "%d\n", (reg_value & 0x1)); 2791 2792fail: 2793 return ret; 2794} 2795 2796static ssize_t ab8505_powercut_write(struct device *dev, 2797 struct device_attribute *attr, 2798 const char *buf, size_t count) 2799{ 2800 int ret; 2801 int reg_value; 2802 struct power_supply *psy = dev_get_drvdata(dev); 2803 struct ab8500_fg *di = power_supply_get_drvdata(psy); 2804 2805 if (kstrtoint(buf, 10, ®_value)) 2806 goto fail; 2807 2808 if (reg_value > 0x1) { 2809 dev_err(dev, "Incorrect parameter, echo 0/1 to disable/enable Pcut feature\n"); 2810 goto fail; 2811 } 2812 2813 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, 2814 AB8505_RTC_PCUT_CTL_STATUS_REG, (u8)reg_value); 2815 2816 if (ret < 0) 2817 dev_err(dev, "Failed to set AB8505_RTC_PCUT_CTL_STATUS_REG\n"); 2818 2819fail: 2820 return count; 2821} 2822 2823static ssize_t ab8505_powercut_flag_read(struct device *dev, 2824 struct device_attribute *attr, 2825 char *buf) 2826{ 2827 2828 int ret; 2829 u8 reg_value; 2830 struct power_supply *psy = dev_get_drvdata(dev); 2831 struct ab8500_fg *di = power_supply_get_drvdata(psy); 2832 2833 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, 2834 AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value); 2835 2836 if (ret < 0) { 2837 dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n"); 2838 goto fail; 2839 } 2840 2841 return sysfs_emit(buf, "%d\n", ((reg_value & 0x10) >> 4)); 2842 2843fail: 2844 return ret; 2845} 2846 2847static ssize_t ab8505_powercut_debounce_read(struct device *dev, 2848 struct device_attribute *attr, 2849 char *buf) 2850{ 2851 int ret; 2852 u8 reg_value; 2853 struct power_supply *psy = dev_get_drvdata(dev); 2854 struct ab8500_fg *di = power_supply_get_drvdata(psy); 2855 2856 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, 2857 AB8505_RTC_PCUT_DEBOUNCE_REG, ®_value); 2858 2859 if (ret < 0) { 2860 dev_err(dev, "Failed to read AB8505_RTC_PCUT_DEBOUNCE_REG\n"); 2861 goto fail; 2862 } 2863 2864 return sysfs_emit(buf, "%d\n", (reg_value & 0x7)); 2865 2866fail: 2867 return ret; 2868} 2869 2870static ssize_t ab8505_powercut_debounce_write(struct device *dev, 2871 struct device_attribute *attr, 2872 const char *buf, size_t count) 2873{ 2874 int ret; 2875 int reg_value; 2876 struct power_supply *psy = dev_get_drvdata(dev); 2877 struct ab8500_fg *di = power_supply_get_drvdata(psy); 2878 2879 if (kstrtoint(buf, 10, ®_value)) 2880 goto fail; 2881 2882 if (reg_value > 0x7) { 2883 dev_err(dev, "Incorrect parameter, echo 0 to 7 for debounce setting\n"); 2884 goto fail; 2885 } 2886 2887 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, 2888 AB8505_RTC_PCUT_DEBOUNCE_REG, (u8)reg_value); 2889 2890 if (ret < 0) 2891 dev_err(dev, "Failed to set AB8505_RTC_PCUT_DEBOUNCE_REG\n"); 2892 2893fail: 2894 return count; 2895} 2896 2897static ssize_t ab8505_powercut_enable_status_read(struct device *dev, 2898 struct device_attribute *attr, 2899 char *buf) 2900{ 2901 int ret; 2902 u8 reg_value; 2903 struct power_supply *psy = dev_get_drvdata(dev); 2904 struct ab8500_fg *di = power_supply_get_drvdata(psy); 2905 2906 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, 2907 AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value); 2908 2909 if (ret < 0) { 2910 dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n"); 2911 goto fail; 2912 } 2913 2914 return sysfs_emit(buf, "%d\n", ((reg_value & 0x20) >> 5)); 2915 2916fail: 2917 return ret; 2918} 2919 2920static struct device_attribute ab8505_fg_sysfs_psy_attrs[] = { 2921 __ATTR(powercut_flagtime, (S_IRUGO | S_IWUSR | S_IWGRP), 2922 ab8505_powercut_flagtime_read, ab8505_powercut_flagtime_write), 2923 __ATTR(powercut_maxtime, (S_IRUGO | S_IWUSR | S_IWGRP), 2924 ab8505_powercut_maxtime_read, ab8505_powercut_maxtime_write), 2925 __ATTR(powercut_restart_max, (S_IRUGO | S_IWUSR | S_IWGRP), 2926 ab8505_powercut_restart_read, ab8505_powercut_restart_write), 2927 __ATTR(powercut_timer, S_IRUGO, ab8505_powercut_timer_read, NULL), 2928 __ATTR(powercut_restart_counter, S_IRUGO, 2929 ab8505_powercut_restart_counter_read, NULL), 2930 __ATTR(powercut_enable, (S_IRUGO | S_IWUSR | S_IWGRP), 2931 ab8505_powercut_read, ab8505_powercut_write), 2932 __ATTR(powercut_flag, S_IRUGO, ab8505_powercut_flag_read, NULL), 2933 __ATTR(powercut_debounce_time, (S_IRUGO | S_IWUSR | S_IWGRP), 2934 ab8505_powercut_debounce_read, ab8505_powercut_debounce_write), 2935 __ATTR(powercut_enable_status, S_IRUGO, 2936 ab8505_powercut_enable_status_read, NULL), 2937}; 2938 2939static int ab8500_fg_sysfs_psy_create_attrs(struct ab8500_fg *di) 2940{ 2941 unsigned int i; 2942 2943 if (is_ab8505(di->parent)) { 2944 for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++) 2945 if (device_create_file(&di->fg_psy->dev, 2946 &ab8505_fg_sysfs_psy_attrs[i])) 2947 goto sysfs_psy_create_attrs_failed_ab8505; 2948 } 2949 return 0; 2950sysfs_psy_create_attrs_failed_ab8505: 2951 dev_err(&di->fg_psy->dev, "Failed creating sysfs psy attrs for ab8505.\n"); 2952 while (i--) 2953 device_remove_file(&di->fg_psy->dev, 2954 &ab8505_fg_sysfs_psy_attrs[i]); 2955 2956 return -EIO; 2957} 2958 2959static void ab8500_fg_sysfs_psy_remove_attrs(struct ab8500_fg *di) 2960{ 2961 unsigned int i; 2962 2963 if (is_ab8505(di->parent)) { 2964 for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++) 2965 (void)device_remove_file(&di->fg_psy->dev, 2966 &ab8505_fg_sysfs_psy_attrs[i]); 2967 } 2968} 2969 2970/* Exposure to the sysfs interface <<END>> */ 2971 2972static int __maybe_unused ab8500_fg_resume(struct device *dev) 2973{ 2974 struct ab8500_fg *di = dev_get_drvdata(dev); 2975 2976 /* 2977 * Change state if we're not charging. If we're charging we will wake 2978 * up on the FG IRQ 2979 */ 2980 if (!di->flags.charging) { 2981 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_WAKEUP); 2982 queue_work(di->fg_wq, &di->fg_work); 2983 } 2984 2985 return 0; 2986} 2987 2988static int __maybe_unused ab8500_fg_suspend(struct device *dev) 2989{ 2990 struct ab8500_fg *di = dev_get_drvdata(dev); 2991 2992 flush_delayed_work(&di->fg_periodic_work); 2993 flush_work(&di->fg_work); 2994 flush_work(&di->fg_acc_cur_work); 2995 flush_delayed_work(&di->fg_reinit_work); 2996 flush_delayed_work(&di->fg_low_bat_work); 2997 flush_delayed_work(&di->fg_check_hw_failure_work); 2998 2999 /* 3000 * If the FG is enabled we will disable it before going to suspend 3001 * only if we're not charging 3002 */ 3003 if (di->flags.fg_enabled && !di->flags.charging) 3004 ab8500_fg_coulomb_counter(di, false); 3005 3006 return 0; 3007} 3008 3009/* ab8500 fg driver interrupts and their respective isr */ 3010static struct ab8500_fg_interrupts ab8500_fg_irq[] = { 3011 {"NCONV_ACCU", ab8500_fg_cc_convend_handler}, 3012 {"BATT_OVV", ab8500_fg_batt_ovv_handler}, 3013 {"LOW_BAT_F", ab8500_fg_lowbatf_handler}, 3014 {"CC_INT_CALIB", ab8500_fg_cc_int_calib_handler}, 3015 {"CCEOC", ab8500_fg_cc_data_end_handler}, 3016}; 3017 3018static char *supply_interface[] = { 3019 "ab8500_chargalg", 3020 "ab8500_usb", 3021}; 3022 3023static const struct power_supply_desc ab8500_fg_desc = { 3024 .name = "ab8500_fg", 3025 .type = POWER_SUPPLY_TYPE_BATTERY, 3026 .properties = ab8500_fg_props, 3027 .num_properties = ARRAY_SIZE(ab8500_fg_props), 3028 .get_property = ab8500_fg_get_property, 3029 .external_power_changed = ab8500_fg_external_power_changed, 3030}; 3031 3032static int ab8500_fg_bind(struct device *dev, struct device *master, 3033 void *data) 3034{ 3035 struct ab8500_fg *di = dev_get_drvdata(dev); 3036 3037 di->bat_cap.max_mah_design = di->bm->bi->charge_full_design_uah; 3038 di->bat_cap.max_mah = di->bat_cap.max_mah_design; 3039 di->vbat_nom_uv = di->bm->bi->voltage_max_design_uv; 3040 3041 /* Start the coulomb counter */ 3042 ab8500_fg_coulomb_counter(di, true); 3043 /* Run the FG algorithm */ 3044 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); 3045 3046 return 0; 3047} 3048 3049static void ab8500_fg_unbind(struct device *dev, struct device *master, 3050 void *data) 3051{ 3052 struct ab8500_fg *di = dev_get_drvdata(dev); 3053 int ret; 3054 3055 /* Disable coulomb counter */ 3056 ret = ab8500_fg_coulomb_counter(di, false); 3057 if (ret) 3058 dev_err(dev, "failed to disable coulomb counter\n"); 3059 3060 flush_workqueue(di->fg_wq); 3061} 3062 3063static const struct component_ops ab8500_fg_component_ops = { 3064 .bind = ab8500_fg_bind, 3065 .unbind = ab8500_fg_unbind, 3066}; 3067 3068static int ab8500_fg_probe(struct platform_device *pdev) 3069{ 3070 struct device *dev = &pdev->dev; 3071 struct power_supply_config psy_cfg = {}; 3072 struct ab8500_fg *di; 3073 int i, irq; 3074 int ret = 0; 3075 3076 di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL); 3077 if (!di) 3078 return -ENOMEM; 3079 3080 di->bm = &ab8500_bm_data; 3081 3082 mutex_init(&di->cc_lock); 3083 3084 /* get parent data */ 3085 di->dev = dev; 3086 di->parent = dev_get_drvdata(pdev->dev.parent); 3087 3088 di->main_bat_v = devm_iio_channel_get(dev, "main_bat_v"); 3089 if (IS_ERR(di->main_bat_v)) { 3090 ret = dev_err_probe(dev, PTR_ERR(di->main_bat_v), 3091 "failed to get main battery ADC channel\n"); 3092 return ret; 3093 } 3094 3095 if (!of_property_read_u32(dev->of_node, "line-impedance-micro-ohms", 3096 &di->line_impedance_uohm)) 3097 dev_info(dev, "line impedance: %u uOhm\n", 3098 di->line_impedance_uohm); 3099 3100 psy_cfg.supplied_to = supply_interface; 3101 psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface); 3102 psy_cfg.drv_data = di; 3103 3104 di->init_capacity = true; 3105 3106 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT); 3107 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT); 3108 3109 /* Create a work queue for running the FG algorithm */ 3110 di->fg_wq = alloc_ordered_workqueue("ab8500_fg_wq", WQ_MEM_RECLAIM); 3111 if (di->fg_wq == NULL) { 3112 dev_err(dev, "failed to create work queue\n"); 3113 return -ENOMEM; 3114 } 3115 3116 /* Init work for running the fg algorithm instantly */ 3117 INIT_WORK(&di->fg_work, ab8500_fg_instant_work); 3118 3119 /* Init work for getting the battery accumulated current */ 3120 INIT_WORK(&di->fg_acc_cur_work, ab8500_fg_acc_cur_work); 3121 3122 /* Init work for reinitialising the fg algorithm */ 3123 INIT_DEFERRABLE_WORK(&di->fg_reinit_work, 3124 ab8500_fg_reinit_work); 3125 3126 /* Work delayed Queue to run the state machine */ 3127 INIT_DEFERRABLE_WORK(&di->fg_periodic_work, 3128 ab8500_fg_periodic_work); 3129 3130 /* Work to check low battery condition */ 3131 INIT_DEFERRABLE_WORK(&di->fg_low_bat_work, 3132 ab8500_fg_low_bat_work); 3133 3134 /* Init work for HW failure check */ 3135 INIT_DEFERRABLE_WORK(&di->fg_check_hw_failure_work, 3136 ab8500_fg_check_hw_failure_work); 3137 3138 /* Reset battery low voltage flag */ 3139 di->flags.low_bat = false; 3140 3141 /* Initialize low battery counter */ 3142 di->low_bat_cnt = 10; 3143 3144 /* Initialize OVV, and other registers */ 3145 ret = ab8500_fg_init_hw_registers(di); 3146 if (ret) { 3147 dev_err(dev, "failed to initialize registers\n"); 3148 destroy_workqueue(di->fg_wq); 3149 return ret; 3150 } 3151 3152 /* Consider battery unknown until we're informed otherwise */ 3153 di->flags.batt_unknown = true; 3154 di->flags.batt_id_received = false; 3155 3156 /* Register FG power supply class */ 3157 di->fg_psy = devm_power_supply_register(dev, &ab8500_fg_desc, &psy_cfg); 3158 if (IS_ERR(di->fg_psy)) { 3159 dev_err(dev, "failed to register FG psy\n"); 3160 destroy_workqueue(di->fg_wq); 3161 return PTR_ERR(di->fg_psy); 3162 } 3163 3164 di->fg_samples = SEC_TO_SAMPLE(di->bm->fg_params->init_timer); 3165 3166 /* 3167 * Initialize completion used to notify completion and start 3168 * of inst current 3169 */ 3170 init_completion(&di->ab8500_fg_started); 3171 init_completion(&di->ab8500_fg_complete); 3172 3173 /* Register primary interrupt handlers */ 3174 for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq); i++) { 3175 irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name); 3176 if (irq < 0) { 3177 destroy_workqueue(di->fg_wq); 3178 return irq; 3179 } 3180 3181 ret = devm_request_threaded_irq(dev, irq, NULL, 3182 ab8500_fg_irq[i].isr, 3183 IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT, 3184 ab8500_fg_irq[i].name, di); 3185 3186 if (ret != 0) { 3187 dev_err(dev, "failed to request %s IRQ %d: %d\n", 3188 ab8500_fg_irq[i].name, irq, ret); 3189 destroy_workqueue(di->fg_wq); 3190 return ret; 3191 } 3192 dev_dbg(dev, "Requested %s IRQ %d: %d\n", 3193 ab8500_fg_irq[i].name, irq, ret); 3194 } 3195 3196 di->irq = platform_get_irq_byname(pdev, "CCEOC"); 3197 disable_irq(di->irq); 3198 di->nbr_cceoc_irq_cnt = 0; 3199 3200 platform_set_drvdata(pdev, di); 3201 3202 ret = ab8500_fg_sysfs_init(di); 3203 if (ret) { 3204 dev_err(dev, "failed to create sysfs entry\n"); 3205 destroy_workqueue(di->fg_wq); 3206 return ret; 3207 } 3208 3209 ret = ab8500_fg_sysfs_psy_create_attrs(di); 3210 if (ret) { 3211 dev_err(dev, "failed to create FG psy\n"); 3212 ab8500_fg_sysfs_exit(di); 3213 destroy_workqueue(di->fg_wq); 3214 return ret; 3215 } 3216 3217 /* Calibrate the fg first time */ 3218 di->flags.calibrate = true; 3219 di->calib_state = AB8500_FG_CALIB_INIT; 3220 3221 /* Use room temp as default value until we get an update from driver. */ 3222 di->bat_temp = 210; 3223 3224 list_add_tail(&di->node, &ab8500_fg_list); 3225 3226 return component_add(dev, &ab8500_fg_component_ops); 3227} 3228 3229static void ab8500_fg_remove(struct platform_device *pdev) 3230{ 3231 struct ab8500_fg *di = platform_get_drvdata(pdev); 3232 3233 destroy_workqueue(di->fg_wq); 3234 component_del(&pdev->dev, &ab8500_fg_component_ops); 3235 list_del(&di->node); 3236 ab8500_fg_sysfs_exit(di); 3237 ab8500_fg_sysfs_psy_remove_attrs(di); 3238} 3239 3240static SIMPLE_DEV_PM_OPS(ab8500_fg_pm_ops, ab8500_fg_suspend, ab8500_fg_resume); 3241 3242static const struct of_device_id ab8500_fg_match[] = { 3243 { .compatible = "stericsson,ab8500-fg", }, 3244 { }, 3245}; 3246MODULE_DEVICE_TABLE(of, ab8500_fg_match); 3247 3248struct platform_driver ab8500_fg_driver = { 3249 .probe = ab8500_fg_probe, 3250 .remove_new = ab8500_fg_remove, 3251 .driver = { 3252 .name = "ab8500-fg", 3253 .of_match_table = ab8500_fg_match, 3254 .pm = &ab8500_fg_pm_ops, 3255 }, 3256}; 3257MODULE_LICENSE("GPL v2"); 3258MODULE_AUTHOR("Johan Palsson, Karl Komierowski"); 3259MODULE_ALIAS("platform:ab8500-fg"); 3260MODULE_DESCRIPTION("AB8500 Fuel Gauge driver"); 3261