1 /* 2 * Battery driver for CPCAP PMIC 3 * 4 * Copyright (C) 2017 Tony Lindgren <tony@atomide.com> 5 * 6 * Some parts of the code based on earlie Motorola mapphone Linux kernel 7 * drivers: 8 * 9 * Copyright (C) 2009-2010 Motorola, Inc. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 as 13 * published by the Free Software Foundation. 14 15 * This program is distributed "as is" WITHOUT ANY WARRANTY of any 16 * kind, whether express or implied; without even the implied warranty 17 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 */ 20 21 #include <linux/delay.h> 22 #include <linux/err.h> 23 #include <linux/interrupt.h> 24 #include <linux/kernel.h> 25 #include <linux/module.h> 26 #include <linux/of_device.h> 27 #include <linux/platform_device.h> 28 #include <linux/power_supply.h> 29 #include <linux/reboot.h> 30 #include <linux/regmap.h> 31 32 #include <linux/iio/consumer.h> 33 #include <linux/iio/types.h> 34 #include <linux/mfd/motorola-cpcap.h> 35 36 #include <asm/div64.h> 37 38 /* 39 * Register bit defines for CPCAP_REG_BPEOL. Some of these seem to 40 * map to MC13783UG.pdf "Table 5-19. Register 13, Power Control 0" 41 * to enable BATTDETEN, LOBAT and EOL features. We currently use 42 * LOBAT interrupts instead of EOL. 43 */ 44 #define CPCAP_REG_BPEOL_BIT_EOL9 BIT(9) /* Set for EOL irq */ 45 #define CPCAP_REG_BPEOL_BIT_EOL8 BIT(8) /* Set for EOL irq */ 46 #define CPCAP_REG_BPEOL_BIT_UNKNOWN7 BIT(7) 47 #define CPCAP_REG_BPEOL_BIT_UNKNOWN6 BIT(6) 48 #define CPCAP_REG_BPEOL_BIT_UNKNOWN5 BIT(5) 49 #define CPCAP_REG_BPEOL_BIT_EOL_MULTI BIT(4) /* Set for multiple EOL irqs */ 50 #define CPCAP_REG_BPEOL_BIT_UNKNOWN3 BIT(3) 51 #define CPCAP_REG_BPEOL_BIT_UNKNOWN2 BIT(2) 52 #define CPCAP_REG_BPEOL_BIT_BATTDETEN BIT(1) /* Enable battery detect */ 53 #define CPCAP_REG_BPEOL_BIT_EOLSEL BIT(0) /* BPDET = 0, EOL = 1 */ 54 55 #define CPCAP_BATTERY_CC_SAMPLE_PERIOD_MS 250 56 57 enum { 58 CPCAP_BATTERY_IIO_BATTDET, 59 CPCAP_BATTERY_IIO_VOLTAGE, 60 CPCAP_BATTERY_IIO_CHRG_CURRENT, 61 CPCAP_BATTERY_IIO_BATT_CURRENT, 62 CPCAP_BATTERY_IIO_NR, 63 }; 64 65 enum cpcap_battery_irq_action { 66 CPCAP_BATTERY_IRQ_ACTION_NONE, 67 CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW, 68 CPCAP_BATTERY_IRQ_ACTION_POWEROFF, 69 }; 70 71 struct cpcap_interrupt_desc { 72 const char *name; 73 struct list_head node; 74 int irq; 75 enum cpcap_battery_irq_action action; 76 }; 77 78 struct cpcap_battery_config { 79 int ccm; 80 int cd_factor; 81 struct power_supply_info info; 82 }; 83 84 struct cpcap_coulomb_counter_data { 85 s32 sample; /* 24-bits */ 86 s32 accumulator; 87 s16 offset; /* 10-bits */ 88 }; 89 90 enum cpcap_battery_state { 91 CPCAP_BATTERY_STATE_PREVIOUS, 92 CPCAP_BATTERY_STATE_LATEST, 93 CPCAP_BATTERY_STATE_NR, 94 }; 95 96 struct cpcap_battery_state_data { 97 int voltage; 98 int current_ua; 99 int counter_uah; 100 int temperature; 101 ktime_t time; 102 struct cpcap_coulomb_counter_data cc; 103 }; 104 105 struct cpcap_battery_ddata { 106 struct device *dev; 107 struct regmap *reg; 108 struct list_head irq_list; 109 struct iio_channel *channels[CPCAP_BATTERY_IIO_NR]; 110 struct power_supply *psy; 111 struct cpcap_battery_config config; 112 struct cpcap_battery_state_data state[CPCAP_BATTERY_STATE_NR]; 113 atomic_t active; 114 int status; 115 u16 vendor; 116 }; 117 118 #define CPCAP_NO_BATTERY -400 119 120 static struct cpcap_battery_state_data * 121 cpcap_battery_get_state(struct cpcap_battery_ddata *ddata, 122 enum cpcap_battery_state state) 123 { 124 if (state >= CPCAP_BATTERY_STATE_NR) 125 return NULL; 126 127 return &ddata->state[state]; 128 } 129 130 static struct cpcap_battery_state_data * 131 cpcap_battery_latest(struct cpcap_battery_ddata *ddata) 132 { 133 return cpcap_battery_get_state(ddata, CPCAP_BATTERY_STATE_LATEST); 134 } 135 136 static struct cpcap_battery_state_data * 137 cpcap_battery_previous(struct cpcap_battery_ddata *ddata) 138 { 139 return cpcap_battery_get_state(ddata, CPCAP_BATTERY_STATE_PREVIOUS); 140 } 141 142 static int cpcap_charger_battery_temperature(struct cpcap_battery_ddata *ddata, 143 int *value) 144 { 145 struct iio_channel *channel; 146 int error; 147 148 channel = ddata->channels[CPCAP_BATTERY_IIO_BATTDET]; 149 error = iio_read_channel_processed(channel, value); 150 if (error < 0) { 151 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error); 152 *value = CPCAP_NO_BATTERY; 153 154 return error; 155 } 156 157 *value /= 100; 158 159 return 0; 160 } 161 162 static int cpcap_battery_get_voltage(struct cpcap_battery_ddata *ddata) 163 { 164 struct iio_channel *channel; 165 int error, value = 0; 166 167 channel = ddata->channels[CPCAP_BATTERY_IIO_VOLTAGE]; 168 error = iio_read_channel_processed(channel, &value); 169 if (error < 0) { 170 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error); 171 172 return 0; 173 } 174 175 return value * 1000; 176 } 177 178 static int cpcap_battery_get_current(struct cpcap_battery_ddata *ddata) 179 { 180 struct iio_channel *channel; 181 int error, value = 0; 182 183 channel = ddata->channels[CPCAP_BATTERY_IIO_BATT_CURRENT]; 184 error = iio_read_channel_processed(channel, &value); 185 if (error < 0) { 186 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error); 187 188 return 0; 189 } 190 191 return value * 1000; 192 } 193 194 /** 195 * cpcap_battery_cc_raw_div - calculate and divide coulomb counter μAms values 196 * @ddata: device driver data 197 * @sample: coulomb counter sample value 198 * @accumulator: coulomb counter integrator value 199 * @offset: coulomb counter offset value 200 * @divider: conversion divider 201 * 202 * Note that cc_lsb and cc_dur values are from Motorola Linux kernel 203 * function data_get_avg_curr_ua() and seem to be based on measured test 204 * results. It also has the following comment: 205 * 206 * Adjustment factors are applied here as a temp solution per the test 207 * results. Need to work out a formal solution for this adjustment. 208 * 209 * A coulomb counter for similar hardware seems to be documented in 210 * "TWL6030 Gas Gauging Basics (Rev. A)" swca095a.pdf in chapter 211 * "10 Calculating Accumulated Current". We however follow what the 212 * Motorola mapphone Linux kernel is doing as there may be either a 213 * TI or ST coulomb counter in the PMIC. 214 */ 215 static int cpcap_battery_cc_raw_div(struct cpcap_battery_ddata *ddata, 216 u32 sample, s32 accumulator, 217 s16 offset, u32 divider) 218 { 219 s64 acc; 220 u64 tmp; 221 int avg_current; 222 u32 cc_lsb; 223 224 sample &= 0xffffff; /* 24-bits, unsigned */ 225 offset &= 0x7ff; /* 10-bits, signed */ 226 227 switch (ddata->vendor) { 228 case CPCAP_VENDOR_ST: 229 cc_lsb = 95374; /* μAms per LSB */ 230 break; 231 case CPCAP_VENDOR_TI: 232 cc_lsb = 91501; /* μAms per LSB */ 233 break; 234 default: 235 return -EINVAL; 236 } 237 238 acc = accumulator; 239 acc = acc - ((s64)sample * offset); 240 cc_lsb = (cc_lsb * ddata->config.cd_factor) / 1000; 241 242 if (acc >= 0) 243 tmp = acc; 244 else 245 tmp = acc * -1; 246 247 tmp = tmp * cc_lsb; 248 do_div(tmp, divider); 249 avg_current = tmp; 250 251 if (acc >= 0) 252 return -avg_current; 253 else 254 return avg_current; 255 } 256 257 /* 3600000μAms = 1μAh */ 258 static int cpcap_battery_cc_to_uah(struct cpcap_battery_ddata *ddata, 259 u32 sample, s32 accumulator, 260 s16 offset) 261 { 262 return cpcap_battery_cc_raw_div(ddata, sample, 263 accumulator, offset, 264 3600000); 265 } 266 267 static int cpcap_battery_cc_to_ua(struct cpcap_battery_ddata *ddata, 268 u32 sample, s32 accumulator, 269 s16 offset) 270 { 271 return cpcap_battery_cc_raw_div(ddata, sample, 272 accumulator, offset, 273 sample * 274 CPCAP_BATTERY_CC_SAMPLE_PERIOD_MS); 275 } 276 277 /** 278 * cpcap_battery_read_accumulated - reads cpcap coulomb counter 279 * @ddata: device driver data 280 * @regs: coulomb counter values 281 * 282 * Based on Motorola mapphone kernel function data_read_regs(). 283 * Looking at the registers, the coulomb counter seems similar to 284 * the coulomb counter in TWL6030. See "TWL6030 Gas Gauging Basics 285 * (Rev. A) swca095a.pdf for "10 Calculating Accumulated Current". 286 * 287 * Note that swca095a.pdf instructs to stop the coulomb counter 288 * before reading to avoid values changing. Motorola mapphone 289 * Linux kernel does not do it, so let's assume they've verified 290 * the data produced is correct. 291 */ 292 static int 293 cpcap_battery_read_accumulated(struct cpcap_battery_ddata *ddata, 294 struct cpcap_coulomb_counter_data *ccd) 295 { 296 u16 buf[7]; /* CPCAP_REG_CC1 to CCI */ 297 int error; 298 299 ccd->sample = 0; 300 ccd->accumulator = 0; 301 ccd->offset = 0; 302 303 /* Read coulomb counter register range */ 304 error = regmap_bulk_read(ddata->reg, CPCAP_REG_CCS1, 305 buf, ARRAY_SIZE(buf)); 306 if (error) 307 return 0; 308 309 /* Sample value CPCAP_REG_CCS1 & 2 */ 310 ccd->sample = (buf[1] & 0x0fff) << 16; 311 ccd->sample |= buf[0]; 312 313 /* Accumulator value CPCAP_REG_CCA1 & 2 */ 314 ccd->accumulator = ((s16)buf[3]) << 16; 315 ccd->accumulator |= buf[2]; 316 317 /* Offset value CPCAP_REG_CCO */ 318 ccd->offset = buf[5]; 319 320 /* Adjust offset based on mode value CPCAP_REG_CCM? */ 321 if (buf[4] >= 0x200) 322 ccd->offset |= 0xfc00; 323 324 return cpcap_battery_cc_to_uah(ddata, 325 ccd->sample, 326 ccd->accumulator, 327 ccd->offset); 328 } 329 330 /** 331 * cpcap_battery_cc_get_avg_current - read cpcap coulumb counter 332 * @ddata: cpcap battery driver device data 333 */ 334 static int cpcap_battery_cc_get_avg_current(struct cpcap_battery_ddata *ddata) 335 { 336 int value, acc, error; 337 s32 sample = 1; 338 s16 offset; 339 340 if (ddata->vendor == CPCAP_VENDOR_ST) 341 sample = 4; 342 343 /* Coulomb counter integrator */ 344 error = regmap_read(ddata->reg, CPCAP_REG_CCI, &value); 345 if (error) 346 return error; 347 348 if ((ddata->vendor == CPCAP_VENDOR_TI) && (value > 0x2000)) 349 value = value | 0xc000; 350 351 acc = (s16)value; 352 353 /* Coulomb counter sample time */ 354 error = regmap_read(ddata->reg, CPCAP_REG_CCM, &value); 355 if (error) 356 return error; 357 358 if (value < 0x200) 359 offset = value; 360 else 361 offset = value | 0xfc00; 362 363 return cpcap_battery_cc_to_ua(ddata, sample, acc, offset); 364 } 365 366 static bool cpcap_battery_full(struct cpcap_battery_ddata *ddata) 367 { 368 struct cpcap_battery_state_data *state = cpcap_battery_latest(ddata); 369 370 /* Basically anything that measures above 4347000 is full */ 371 if (state->voltage >= (ddata->config.info.voltage_max_design - 4000)) 372 return true; 373 374 return false; 375 } 376 377 static int cpcap_battery_update_status(struct cpcap_battery_ddata *ddata) 378 { 379 struct cpcap_battery_state_data state, *latest, *previous; 380 ktime_t now; 381 int error; 382 383 memset(&state, 0, sizeof(state)); 384 now = ktime_get(); 385 386 latest = cpcap_battery_latest(ddata); 387 if (latest) { 388 s64 delta_ms = ktime_to_ms(ktime_sub(now, latest->time)); 389 390 if (delta_ms < CPCAP_BATTERY_CC_SAMPLE_PERIOD_MS) 391 return delta_ms; 392 } 393 394 state.time = now; 395 state.voltage = cpcap_battery_get_voltage(ddata); 396 state.current_ua = cpcap_battery_get_current(ddata); 397 state.counter_uah = cpcap_battery_read_accumulated(ddata, &state.cc); 398 399 error = cpcap_charger_battery_temperature(ddata, 400 &state.temperature); 401 if (error) 402 return error; 403 404 previous = cpcap_battery_previous(ddata); 405 memcpy(previous, latest, sizeof(*previous)); 406 memcpy(latest, &state, sizeof(*latest)); 407 408 return 0; 409 } 410 411 static enum power_supply_property cpcap_battery_props[] = { 412 POWER_SUPPLY_PROP_STATUS, 413 POWER_SUPPLY_PROP_PRESENT, 414 POWER_SUPPLY_PROP_TECHNOLOGY, 415 POWER_SUPPLY_PROP_VOLTAGE_NOW, 416 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 417 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 418 POWER_SUPPLY_PROP_CURRENT_AVG, 419 POWER_SUPPLY_PROP_CURRENT_NOW, 420 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 421 POWER_SUPPLY_PROP_CHARGE_COUNTER, 422 POWER_SUPPLY_PROP_POWER_NOW, 423 POWER_SUPPLY_PROP_POWER_AVG, 424 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 425 POWER_SUPPLY_PROP_SCOPE, 426 POWER_SUPPLY_PROP_TEMP, 427 }; 428 429 static int cpcap_battery_get_property(struct power_supply *psy, 430 enum power_supply_property psp, 431 union power_supply_propval *val) 432 { 433 struct cpcap_battery_ddata *ddata = power_supply_get_drvdata(psy); 434 struct cpcap_battery_state_data *latest, *previous; 435 u32 sample; 436 s32 accumulator; 437 int cached; 438 s64 tmp; 439 440 cached = cpcap_battery_update_status(ddata); 441 if (cached < 0) 442 return cached; 443 444 latest = cpcap_battery_latest(ddata); 445 previous = cpcap_battery_previous(ddata); 446 447 switch (psp) { 448 case POWER_SUPPLY_PROP_PRESENT: 449 if (latest->temperature > CPCAP_NO_BATTERY) 450 val->intval = 1; 451 else 452 val->intval = 0; 453 break; 454 case POWER_SUPPLY_PROP_STATUS: 455 if (cpcap_battery_full(ddata)) { 456 val->intval = POWER_SUPPLY_STATUS_FULL; 457 break; 458 } 459 if (cpcap_battery_cc_get_avg_current(ddata) < 0) 460 val->intval = POWER_SUPPLY_STATUS_CHARGING; 461 else 462 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 463 break; 464 case POWER_SUPPLY_PROP_TECHNOLOGY: 465 val->intval = ddata->config.info.technology; 466 break; 467 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 468 val->intval = cpcap_battery_get_voltage(ddata); 469 break; 470 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 471 val->intval = ddata->config.info.voltage_max_design; 472 break; 473 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 474 val->intval = ddata->config.info.voltage_min_design; 475 break; 476 case POWER_SUPPLY_PROP_CURRENT_AVG: 477 if (cached) { 478 val->intval = cpcap_battery_cc_get_avg_current(ddata); 479 break; 480 } 481 sample = latest->cc.sample - previous->cc.sample; 482 accumulator = latest->cc.accumulator - previous->cc.accumulator; 483 val->intval = cpcap_battery_cc_to_ua(ddata, sample, 484 accumulator, 485 latest->cc.offset); 486 break; 487 case POWER_SUPPLY_PROP_CURRENT_NOW: 488 val->intval = latest->current_ua; 489 break; 490 case POWER_SUPPLY_PROP_CHARGE_COUNTER: 491 val->intval = latest->counter_uah; 492 break; 493 case POWER_SUPPLY_PROP_POWER_NOW: 494 tmp = (latest->voltage / 10000) * latest->current_ua; 495 val->intval = div64_s64(tmp, 100); 496 break; 497 case POWER_SUPPLY_PROP_POWER_AVG: 498 if (cached) { 499 tmp = cpcap_battery_cc_get_avg_current(ddata); 500 tmp *= (latest->voltage / 10000); 501 val->intval = div64_s64(tmp, 100); 502 break; 503 } 504 sample = latest->cc.sample - previous->cc.sample; 505 accumulator = latest->cc.accumulator - previous->cc.accumulator; 506 tmp = cpcap_battery_cc_to_ua(ddata, sample, accumulator, 507 latest->cc.offset); 508 tmp *= ((latest->voltage + previous->voltage) / 20000); 509 val->intval = div64_s64(tmp, 100); 510 break; 511 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 512 if (cpcap_battery_full(ddata)) 513 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 514 else if (latest->voltage >= 3750000) 515 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_HIGH; 516 else if (latest->voltage >= 3300000) 517 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 518 else if (latest->voltage > 3100000) 519 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 520 else if (latest->voltage <= 3100000) 521 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; 522 else 523 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN; 524 break; 525 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 526 val->intval = ddata->config.info.charge_full_design; 527 break; 528 case POWER_SUPPLY_PROP_SCOPE: 529 val->intval = POWER_SUPPLY_SCOPE_SYSTEM; 530 break; 531 case POWER_SUPPLY_PROP_TEMP: 532 val->intval = latest->temperature; 533 break; 534 default: 535 return -EINVAL; 536 } 537 538 return 0; 539 } 540 541 static irqreturn_t cpcap_battery_irq_thread(int irq, void *data) 542 { 543 struct cpcap_battery_ddata *ddata = data; 544 struct cpcap_battery_state_data *latest; 545 struct cpcap_interrupt_desc *d; 546 547 if (!atomic_read(&ddata->active)) 548 return IRQ_NONE; 549 550 list_for_each_entry(d, &ddata->irq_list, node) { 551 if (irq == d->irq) 552 break; 553 } 554 555 if (!d) 556 return IRQ_NONE; 557 558 latest = cpcap_battery_latest(ddata); 559 560 switch (d->action) { 561 case CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW: 562 if (latest->counter_uah >= 0) 563 dev_warn(ddata->dev, "Battery low at 3.3V!\n"); 564 break; 565 case CPCAP_BATTERY_IRQ_ACTION_POWEROFF: 566 if (latest->counter_uah >= 0) { 567 dev_emerg(ddata->dev, 568 "Battery empty at 3.1V, powering off\n"); 569 orderly_poweroff(true); 570 } 571 break; 572 default: 573 break; 574 } 575 576 power_supply_changed(ddata->psy); 577 578 return IRQ_HANDLED; 579 } 580 581 static int cpcap_battery_init_irq(struct platform_device *pdev, 582 struct cpcap_battery_ddata *ddata, 583 const char *name) 584 { 585 struct cpcap_interrupt_desc *d; 586 int irq, error; 587 588 irq = platform_get_irq_byname(pdev, name); 589 if (irq < 0) 590 return irq; 591 592 error = devm_request_threaded_irq(ddata->dev, irq, NULL, 593 cpcap_battery_irq_thread, 594 IRQF_SHARED, 595 name, ddata); 596 if (error) { 597 dev_err(ddata->dev, "could not get irq %s: %i\n", 598 name, error); 599 600 return error; 601 } 602 603 d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL); 604 if (!d) 605 return -ENOMEM; 606 607 d->name = name; 608 d->irq = irq; 609 610 if (!strncmp(name, "lowbph", 6)) 611 d->action = CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW; 612 else if (!strncmp(name, "lowbpl", 6)) 613 d->action = CPCAP_BATTERY_IRQ_ACTION_POWEROFF; 614 615 list_add(&d->node, &ddata->irq_list); 616 617 return 0; 618 } 619 620 static int cpcap_battery_init_interrupts(struct platform_device *pdev, 621 struct cpcap_battery_ddata *ddata) 622 { 623 const char * const cpcap_battery_irqs[] = { 624 "eol", "lowbph", "lowbpl", 625 "chrgcurr1", "battdetb" 626 }; 627 int i, error; 628 629 for (i = 0; i < ARRAY_SIZE(cpcap_battery_irqs); i++) { 630 error = cpcap_battery_init_irq(pdev, ddata, 631 cpcap_battery_irqs[i]); 632 if (error) 633 return error; 634 } 635 636 /* Enable low battery interrupts for 3.3V high and 3.1V low */ 637 error = regmap_update_bits(ddata->reg, CPCAP_REG_BPEOL, 638 0xffff, 639 CPCAP_REG_BPEOL_BIT_BATTDETEN); 640 if (error) 641 return error; 642 643 return 0; 644 } 645 646 static int cpcap_battery_init_iio(struct cpcap_battery_ddata *ddata) 647 { 648 const char * const names[CPCAP_BATTERY_IIO_NR] = { 649 "battdetb", "battp", "chg_isense", "batti", 650 }; 651 int error, i; 652 653 for (i = 0; i < CPCAP_BATTERY_IIO_NR; i++) { 654 ddata->channels[i] = devm_iio_channel_get(ddata->dev, 655 names[i]); 656 if (IS_ERR(ddata->channels[i])) { 657 error = PTR_ERR(ddata->channels[i]); 658 goto out_err; 659 } 660 661 if (!ddata->channels[i]->indio_dev) { 662 error = -ENXIO; 663 goto out_err; 664 } 665 } 666 667 return 0; 668 669 out_err: 670 dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n", 671 error); 672 673 return error; 674 } 675 676 /* 677 * Based on the values from Motorola mapphone Linux kernel. In the 678 * the Motorola mapphone Linux kernel tree the value for pm_cd_factor 679 * is passed to the kernel via device tree. If it turns out to be 680 * something device specific we can consider that too later. 681 * 682 * And looking at the battery full and shutdown values for the stock 683 * kernel on droid 4, full is 4351000 and software initiates shutdown 684 * at 3078000. The device will die around 2743000. 685 */ 686 static const struct cpcap_battery_config cpcap_battery_default_data = { 687 .ccm = 0x3ff, 688 .cd_factor = 0x3cc, 689 .info.technology = POWER_SUPPLY_TECHNOLOGY_LION, 690 .info.voltage_max_design = 4351000, 691 .info.voltage_min_design = 3100000, 692 .info.charge_full_design = 1740000, 693 }; 694 695 #ifdef CONFIG_OF 696 static const struct of_device_id cpcap_battery_id_table[] = { 697 { 698 .compatible = "motorola,cpcap-battery", 699 .data = &cpcap_battery_default_data, 700 }, 701 {}, 702 }; 703 MODULE_DEVICE_TABLE(of, cpcap_battery_id_table); 704 #endif 705 706 static int cpcap_battery_probe(struct platform_device *pdev) 707 { 708 struct power_supply_desc *psy_desc; 709 struct cpcap_battery_ddata *ddata; 710 const struct of_device_id *match; 711 struct power_supply_config psy_cfg = {}; 712 int error; 713 714 match = of_match_device(of_match_ptr(cpcap_battery_id_table), 715 &pdev->dev); 716 if (!match) 717 return -EINVAL; 718 719 if (!match->data) { 720 dev_err(&pdev->dev, "no configuration data found\n"); 721 722 return -ENODEV; 723 } 724 725 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); 726 if (!ddata) 727 return -ENOMEM; 728 729 INIT_LIST_HEAD(&ddata->irq_list); 730 ddata->dev = &pdev->dev; 731 memcpy(&ddata->config, match->data, sizeof(ddata->config)); 732 733 ddata->reg = dev_get_regmap(ddata->dev->parent, NULL); 734 if (!ddata->reg) 735 return -ENODEV; 736 737 error = cpcap_get_vendor(ddata->dev, ddata->reg, &ddata->vendor); 738 if (error) 739 return error; 740 741 platform_set_drvdata(pdev, ddata); 742 743 error = regmap_update_bits(ddata->reg, CPCAP_REG_CCM, 744 0xffff, ddata->config.ccm); 745 if (error) 746 return error; 747 748 error = cpcap_battery_init_interrupts(pdev, ddata); 749 if (error) 750 return error; 751 752 error = cpcap_battery_init_iio(ddata); 753 if (error) 754 return error; 755 756 psy_desc = devm_kzalloc(ddata->dev, sizeof(*psy_desc), GFP_KERNEL); 757 if (!psy_desc) 758 return -ENOMEM; 759 760 psy_desc->name = "battery", 761 psy_desc->type = POWER_SUPPLY_TYPE_BATTERY, 762 psy_desc->properties = cpcap_battery_props, 763 psy_desc->num_properties = ARRAY_SIZE(cpcap_battery_props), 764 psy_desc->get_property = cpcap_battery_get_property, 765 766 psy_cfg.of_node = pdev->dev.of_node; 767 psy_cfg.drv_data = ddata; 768 769 ddata->psy = devm_power_supply_register(ddata->dev, psy_desc, 770 &psy_cfg); 771 error = PTR_ERR_OR_ZERO(ddata->psy); 772 if (error) { 773 dev_err(ddata->dev, "failed to register power supply\n"); 774 return error; 775 } 776 777 atomic_set(&ddata->active, 1); 778 779 return 0; 780 } 781 782 static int cpcap_battery_remove(struct platform_device *pdev) 783 { 784 struct cpcap_battery_ddata *ddata = platform_get_drvdata(pdev); 785 int error; 786 787 atomic_set(&ddata->active, 0); 788 error = regmap_update_bits(ddata->reg, CPCAP_REG_BPEOL, 789 0xffff, 0); 790 if (error) 791 dev_err(&pdev->dev, "could not disable: %i\n", error); 792 793 return 0; 794 } 795 796 static struct platform_driver cpcap_battery_driver = { 797 .driver = { 798 .name = "cpcap_battery", 799 .of_match_table = of_match_ptr(cpcap_battery_id_table), 800 }, 801 .probe = cpcap_battery_probe, 802 .remove = cpcap_battery_remove, 803 }; 804 module_platform_driver(cpcap_battery_driver); 805 806 MODULE_LICENSE("GPL v2"); 807 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>"); 808 MODULE_DESCRIPTION("CPCAP PMIC Battery Driver"); 809