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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Summit Microelectronics SMB347 Battery Charger Driver4 *5 * Copyright (C) 2011, Intel Corporation6 *7 * Authors: Bruce E. Robertson <bruce.e.robertson@intel.com>8 * Mika Westerberg <mika.westerberg@linux.intel.com>9 */10 11#include <linux/delay.h>12#include <linux/err.h>13#include <linux/kernel.h>14#include <linux/module.h>15#include <linux/init.h>16#include <linux/interrupt.h>17#include <linux/i2c.h>18#include <linux/power_supply.h>19#include <linux/property.h>20#include <linux/regmap.h>21#include <linux/regulator/driver.h>22 23#include <dt-bindings/power/summit,smb347-charger.h>24 25/* Use the default compensation method */26#define SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT -127 28/* Use default factory programmed value for hard/soft temperature limit */29#define SMB3XX_TEMP_USE_DEFAULT -27330 31/*32 * Configuration registers. These are mirrored to volatile RAM and can be33 * written once %CMD_A_ALLOW_WRITE is set in %CMD_A register. They will be34 * reloaded from non-volatile registers after POR.35 */36#define CFG_CHARGE_CURRENT 0x0037#define CFG_CHARGE_CURRENT_FCC_MASK 0xe038#define CFG_CHARGE_CURRENT_FCC_SHIFT 539#define CFG_CHARGE_CURRENT_PCC_MASK 0x1840#define CFG_CHARGE_CURRENT_PCC_SHIFT 341#define CFG_CHARGE_CURRENT_TC_MASK 0x0742#define CFG_CURRENT_LIMIT 0x0143#define CFG_CURRENT_LIMIT_DC_MASK 0xf044#define CFG_CURRENT_LIMIT_DC_SHIFT 445#define CFG_CURRENT_LIMIT_USB_MASK 0x0f46#define CFG_FLOAT_VOLTAGE 0x0347#define CFG_FLOAT_VOLTAGE_FLOAT_MASK 0x3f48#define CFG_FLOAT_VOLTAGE_THRESHOLD_MASK 0xc049#define CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT 650#define CFG_STAT 0x0551#define CFG_STAT_DISABLED BIT(5)52#define CFG_STAT_ACTIVE_HIGH BIT(7)53#define CFG_PIN 0x0654#define CFG_PIN_EN_CTRL_MASK 0x6055#define CFG_PIN_EN_CTRL_ACTIVE_HIGH 0x4056#define CFG_PIN_EN_CTRL_ACTIVE_LOW 0x6057#define CFG_PIN_EN_APSD_IRQ BIT(1)58#define CFG_PIN_EN_CHARGER_ERROR BIT(2)59#define CFG_PIN_EN_CTRL BIT(4)60#define CFG_THERM 0x0761#define CFG_THERM_SOFT_HOT_COMPENSATION_MASK 0x0362#define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT 063#define CFG_THERM_SOFT_COLD_COMPENSATION_MASK 0x0c64#define CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT 265#define CFG_THERM_MONITOR_DISABLED BIT(4)66#define CFG_SYSOK 0x0867#define CFG_SYSOK_INOK_ACTIVE_HIGH BIT(0)68#define CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED BIT(2)69#define CFG_OTHER 0x0970#define CFG_OTHER_RID_MASK 0xc071#define CFG_OTHER_RID_ENABLED_AUTO_OTG 0xc072#define CFG_OTG 0x0a73#define CFG_OTG_TEMP_THRESHOLD_MASK 0x3074#define CFG_OTG_CURRENT_LIMIT_250mA BIT(2)75#define CFG_OTG_CURRENT_LIMIT_750mA BIT(3)76#define CFG_OTG_TEMP_THRESHOLD_SHIFT 477#define CFG_OTG_CC_COMPENSATION_MASK 0xc078#define CFG_OTG_CC_COMPENSATION_SHIFT 679#define CFG_TEMP_LIMIT 0x0b80#define CFG_TEMP_LIMIT_SOFT_HOT_MASK 0x0381#define CFG_TEMP_LIMIT_SOFT_HOT_SHIFT 082#define CFG_TEMP_LIMIT_SOFT_COLD_MASK 0x0c83#define CFG_TEMP_LIMIT_SOFT_COLD_SHIFT 284#define CFG_TEMP_LIMIT_HARD_HOT_MASK 0x3085#define CFG_TEMP_LIMIT_HARD_HOT_SHIFT 486#define CFG_TEMP_LIMIT_HARD_COLD_MASK 0xc087#define CFG_TEMP_LIMIT_HARD_COLD_SHIFT 688#define CFG_FAULT_IRQ 0x0c89#define CFG_FAULT_IRQ_DCIN_UV BIT(2)90#define CFG_STATUS_IRQ 0x0d91#define CFG_STATUS_IRQ_TERMINATION_OR_TAPER BIT(4)92#define CFG_STATUS_IRQ_CHARGE_TIMEOUT BIT(7)93#define CFG_ADDRESS 0x0e94 95/* Command registers */96#define CMD_A 0x3097#define CMD_A_CHG_ENABLED BIT(1)98#define CMD_A_SUSPEND_ENABLED BIT(2)99#define CMD_A_OTG_ENABLED BIT(4)100#define CMD_A_ALLOW_WRITE BIT(7)101#define CMD_B 0x31102#define CMD_C 0x33103 104/* Interrupt Status registers */105#define IRQSTAT_A 0x35106#define IRQSTAT_C 0x37107#define IRQSTAT_C_TERMINATION_STAT BIT(0)108#define IRQSTAT_C_TERMINATION_IRQ BIT(1)109#define IRQSTAT_C_TAPER_IRQ BIT(3)110#define IRQSTAT_D 0x38111#define IRQSTAT_D_CHARGE_TIMEOUT_STAT BIT(2)112#define IRQSTAT_D_CHARGE_TIMEOUT_IRQ BIT(3)113#define IRQSTAT_E 0x39114#define IRQSTAT_E_USBIN_UV_STAT BIT(0)115#define IRQSTAT_E_USBIN_UV_IRQ BIT(1)116#define IRQSTAT_E_DCIN_UV_STAT BIT(4)117#define IRQSTAT_E_DCIN_UV_IRQ BIT(5)118#define IRQSTAT_F 0x3a119 120/* Status registers */121#define STAT_A 0x3b122#define STAT_A_FLOAT_VOLTAGE_MASK 0x3f123#define STAT_B 0x3c124#define STAT_C 0x3d125#define STAT_C_CHG_ENABLED BIT(0)126#define STAT_C_HOLDOFF_STAT BIT(3)127#define STAT_C_CHG_MASK 0x06128#define STAT_C_CHG_SHIFT 1129#define STAT_C_CHG_TERM BIT(5)130#define STAT_C_CHARGER_ERROR BIT(6)131#define STAT_E 0x3f132 133#define SMB347_MAX_REGISTER 0x3f134 135/**136 * struct smb347_charger - smb347 charger instance137 * @dev: pointer to device138 * @regmap: pointer to driver regmap139 * @mains: power_supply instance for AC/DC power140 * @usb: power_supply instance for USB power141 * @usb_rdev: USB VBUS regulator device142 * @id: SMB charger ID143 * @mains_online: is AC/DC input connected144 * @usb_online: is USB input connected145 * @irq_unsupported: is interrupt unsupported by SMB hardware146 * @usb_vbus_enabled: is USB VBUS powered by SMB charger147 * @max_charge_current: maximum current (in uA) the battery can be charged148 * @max_charge_voltage: maximum voltage (in uV) the battery can be charged149 * @pre_charge_current: current (in uA) to use in pre-charging phase150 * @termination_current: current (in uA) used to determine when the151 * charging cycle terminates152 * @pre_to_fast_voltage: voltage (in uV) treshold used for transitioning to153 * pre-charge to fast charge mode154 * @mains_current_limit: maximum input current drawn from AC/DC input (in uA)155 * @usb_hc_current_limit: maximum input high current (in uA) drawn from USB156 * input157 * @chip_temp_threshold: die temperature where device starts limiting charge158 * current [%100 - %130] (in degree C)159 * @soft_cold_temp_limit: soft cold temperature limit [%0 - %15] (in degree C),160 * granularity is 5 deg C.161 * @soft_hot_temp_limit: soft hot temperature limit [%40 - %55] (in degree C),162 * granularity is 5 deg C.163 * @hard_cold_temp_limit: hard cold temperature limit [%-5 - %10] (in degree C),164 * granularity is 5 deg C.165 * @hard_hot_temp_limit: hard hot temperature limit [%50 - %65] (in degree C),166 * granularity is 5 deg C.167 * @suspend_on_hard_temp_limit: suspend charging when hard limit is hit168 * @soft_temp_limit_compensation: compensation method when soft temperature169 * limit is hit170 * @charge_current_compensation: current (in uA) for charging compensation171 * current when temperature hits soft limits172 * @use_mains: AC/DC input can be used173 * @use_usb: USB input can be used174 * @use_usb_otg: USB OTG output can be used (not implemented yet)175 * @enable_control: how charging enable/disable is controlled176 * (driver/pin controls)177 * @inok_polarity: polarity of INOK signal which denotes presence of external178 * power supply179 *180 * @use_main, @use_usb, and @use_usb_otg are means to enable/disable181 * hardware support for these. This is useful when we want to have for182 * example OTG charging controlled via OTG transceiver driver and not by183 * the SMB347 hardware.184 *185 * Hard and soft temperature limit values are given as described in the186 * device data sheet and assuming NTC beta value is %3750. Even if this is187 * not the case, these values should be used. They can be mapped to the188 * corresponding NTC beta values with the help of table %2 in the data189 * sheet. So for example if NTC beta is %3375 and we want to program hard190 * hot limit to be %53 deg C, @hard_hot_temp_limit should be set to %50.191 *192 * If zero value is given in any of the current and voltage values, the193 * factory programmed default will be used. For soft/hard temperature194 * values, pass in %SMB3XX_TEMP_USE_DEFAULT instead.195 */196struct smb347_charger {197 struct device *dev;198 struct regmap *regmap;199 struct power_supply *mains;200 struct power_supply *usb;201 struct regulator_dev *usb_rdev;202 unsigned int id;203 bool mains_online;204 bool usb_online;205 bool irq_unsupported;206 bool usb_vbus_enabled;207 208 unsigned int max_charge_current;209 unsigned int max_charge_voltage;210 unsigned int pre_charge_current;211 unsigned int termination_current;212 unsigned int pre_to_fast_voltage;213 unsigned int mains_current_limit;214 unsigned int usb_hc_current_limit;215 unsigned int chip_temp_threshold;216 int soft_cold_temp_limit;217 int soft_hot_temp_limit;218 int hard_cold_temp_limit;219 int hard_hot_temp_limit;220 bool suspend_on_hard_temp_limit;221 unsigned int soft_temp_limit_compensation;222 unsigned int charge_current_compensation;223 bool use_mains;224 bool use_usb;225 bool use_usb_otg;226 unsigned int enable_control;227 unsigned int inok_polarity;228};229 230enum smb_charger_chipid {231 SMB345,232 SMB347,233 SMB358,234 NUM_CHIP_TYPES,235};236 237/* Fast charge current in uA */238static const unsigned int fcc_tbl[NUM_CHIP_TYPES][8] = {239 [SMB345] = { 200000, 450000, 600000, 900000,240 1300000, 1500000, 1800000, 2000000 },241 [SMB347] = { 700000, 900000, 1200000, 1500000,242 1800000, 2000000, 2200000, 2500000 },243 [SMB358] = { 200000, 450000, 600000, 900000,244 1300000, 1500000, 1800000, 2000000 },245};246/* Pre-charge current in uA */247static const unsigned int pcc_tbl[NUM_CHIP_TYPES][4] = {248 [SMB345] = { 150000, 250000, 350000, 450000 },249 [SMB347] = { 100000, 150000, 200000, 250000 },250 [SMB358] = { 150000, 250000, 350000, 450000 },251};252 253/* Termination current in uA */254static const unsigned int tc_tbl[NUM_CHIP_TYPES][8] = {255 [SMB345] = { 30000, 40000, 60000, 80000,256 100000, 125000, 150000, 200000 },257 [SMB347] = { 37500, 50000, 100000, 150000,258 200000, 250000, 500000, 600000 },259 [SMB358] = { 30000, 40000, 60000, 80000,260 100000, 125000, 150000, 200000 },261};262 263/* Input current limit in uA */264static const unsigned int icl_tbl[NUM_CHIP_TYPES][10] = {265 [SMB345] = { 300000, 500000, 700000, 1000000, 1500000,266 1800000, 2000000, 2000000, 2000000, 2000000 },267 [SMB347] = { 300000, 500000, 700000, 900000, 1200000,268 1500000, 1800000, 2000000, 2200000, 2500000 },269 [SMB358] = { 300000, 500000, 700000, 1000000, 1500000,270 1800000, 2000000, 2000000, 2000000, 2000000 },271};272 273/* Charge current compensation in uA */274static const unsigned int ccc_tbl[NUM_CHIP_TYPES][4] = {275 [SMB345] = { 200000, 450000, 600000, 900000 },276 [SMB347] = { 250000, 700000, 900000, 1200000 },277 [SMB358] = { 200000, 450000, 600000, 900000 },278};279 280/* Convert register value to current using lookup table */281static int hw_to_current(const unsigned int *tbl, size_t size, unsigned int val)282{283 if (val >= size)284 return -EINVAL;285 return tbl[val];286}287 288/* Convert current to register value using lookup table */289static int current_to_hw(const unsigned int *tbl, size_t size, unsigned int val)290{291 size_t i;292 293 for (i = 0; i < size; i++)294 if (val < tbl[i])295 break;296 return i > 0 ? i - 1 : -EINVAL;297}298 299/**300 * smb347_update_ps_status - refreshes the power source status301 * @smb: pointer to smb347 charger instance302 *303 * Function checks whether any power source is connected to the charger and304 * updates internal state accordingly. If there is a change to previous state305 * function returns %1, otherwise %0 and negative errno in case of errror.306 */307static int smb347_update_ps_status(struct smb347_charger *smb)308{309 bool usb = false;310 bool dc = false;311 unsigned int val;312 int ret;313 314 ret = regmap_read(smb->regmap, IRQSTAT_E, &val);315 if (ret < 0)316 return ret;317 318 /*319 * Dc and usb are set depending on whether they are enabled in320 * platform data _and_ whether corresponding undervoltage is set.321 */322 if (smb->use_mains)323 dc = !(val & IRQSTAT_E_DCIN_UV_STAT);324 if (smb->use_usb)325 usb = !(val & IRQSTAT_E_USBIN_UV_STAT);326 327 ret = smb->mains_online != dc || smb->usb_online != usb;328 smb->mains_online = dc;329 smb->usb_online = usb;330 331 return ret;332}333 334/*335 * smb347_is_ps_online - returns whether input power source is connected336 * @smb: pointer to smb347 charger instance337 *338 * Returns %true if input power source is connected. Note that this is339 * dependent on what platform has configured for usable power sources. For340 * example if USB is disabled, this will return %false even if the USB cable341 * is connected.342 */343static bool smb347_is_ps_online(struct smb347_charger *smb)344{345 return smb->usb_online || smb->mains_online;346}347 348/**349 * smb347_charging_status - returns status of charging350 * @smb: pointer to smb347 charger instance351 *352 * Function returns charging status. %0 means no charging is in progress,353 * %1 means pre-charging, %2 fast-charging and %3 taper-charging.354 */355static int smb347_charging_status(struct smb347_charger *smb)356{357 unsigned int val;358 int ret;359 360 if (!smb347_is_ps_online(smb))361 return 0;362 363 ret = regmap_read(smb->regmap, STAT_C, &val);364 if (ret < 0)365 return 0;366 367 return (val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT;368}369 370static int smb347_charging_set(struct smb347_charger *smb, bool enable)371{372 if (smb->enable_control != SMB3XX_CHG_ENABLE_SW) {373 dev_dbg(smb->dev, "charging enable/disable in SW disabled\n");374 return 0;375 }376 377 if (enable && smb->usb_vbus_enabled) {378 dev_dbg(smb->dev, "charging not enabled because USB is in host mode\n");379 return 0;380 }381 382 return regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED,383 enable ? CMD_A_CHG_ENABLED : 0);384}385 386static inline int smb347_charging_enable(struct smb347_charger *smb)387{388 return smb347_charging_set(smb, true);389}390 391static inline int smb347_charging_disable(struct smb347_charger *smb)392{393 return smb347_charging_set(smb, false);394}395 396static int smb347_start_stop_charging(struct smb347_charger *smb)397{398 int ret;399 400 /*401 * Depending on whether valid power source is connected or not, we402 * disable or enable the charging. We do it manually because it403 * depends on how the platform has configured the valid inputs.404 */405 if (smb347_is_ps_online(smb)) {406 ret = smb347_charging_enable(smb);407 if (ret < 0)408 dev_err(smb->dev, "failed to enable charging\n");409 } else {410 ret = smb347_charging_disable(smb);411 if (ret < 0)412 dev_err(smb->dev, "failed to disable charging\n");413 }414 415 return ret;416}417 418static int smb347_set_charge_current(struct smb347_charger *smb)419{420 unsigned int id = smb->id;421 int ret;422 423 if (smb->max_charge_current) {424 ret = current_to_hw(fcc_tbl[id], ARRAY_SIZE(fcc_tbl[id]),425 smb->max_charge_current);426 if (ret < 0)427 return ret;428 429 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,430 CFG_CHARGE_CURRENT_FCC_MASK,431 ret << CFG_CHARGE_CURRENT_FCC_SHIFT);432 if (ret < 0)433 return ret;434 }435 436 if (smb->pre_charge_current) {437 ret = current_to_hw(pcc_tbl[id], ARRAY_SIZE(pcc_tbl[id]),438 smb->pre_charge_current);439 if (ret < 0)440 return ret;441 442 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,443 CFG_CHARGE_CURRENT_PCC_MASK,444 ret << CFG_CHARGE_CURRENT_PCC_SHIFT);445 if (ret < 0)446 return ret;447 }448 449 if (smb->termination_current) {450 ret = current_to_hw(tc_tbl[id], ARRAY_SIZE(tc_tbl[id]),451 smb->termination_current);452 if (ret < 0)453 return ret;454 455 ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,456 CFG_CHARGE_CURRENT_TC_MASK, ret);457 if (ret < 0)458 return ret;459 }460 461 return 0;462}463 464static int smb347_set_current_limits(struct smb347_charger *smb)465{466 unsigned int id = smb->id;467 int ret;468 469 if (smb->mains_current_limit) {470 ret = current_to_hw(icl_tbl[id], ARRAY_SIZE(icl_tbl[id]),471 smb->mains_current_limit);472 if (ret < 0)473 return ret;474 475 ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,476 CFG_CURRENT_LIMIT_DC_MASK,477 ret << CFG_CURRENT_LIMIT_DC_SHIFT);478 if (ret < 0)479 return ret;480 }481 482 if (smb->usb_hc_current_limit) {483 ret = current_to_hw(icl_tbl[id], ARRAY_SIZE(icl_tbl[id]),484 smb->usb_hc_current_limit);485 if (ret < 0)486 return ret;487 488 ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,489 CFG_CURRENT_LIMIT_USB_MASK, ret);490 if (ret < 0)491 return ret;492 }493 494 return 0;495}496 497static int smb347_set_voltage_limits(struct smb347_charger *smb)498{499 int ret;500 501 if (smb->pre_to_fast_voltage) {502 ret = smb->pre_to_fast_voltage;503 504 /* uV */505 ret = clamp_val(ret, 2400000, 3000000) - 2400000;506 ret /= 200000;507 508 ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,509 CFG_FLOAT_VOLTAGE_THRESHOLD_MASK,510 ret << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT);511 if (ret < 0)512 return ret;513 }514 515 if (smb->max_charge_voltage) {516 ret = smb->max_charge_voltage;517 518 /* uV */519 ret = clamp_val(ret, 3500000, 4500000) - 3500000;520 ret /= 20000;521 522 ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,523 CFG_FLOAT_VOLTAGE_FLOAT_MASK, ret);524 if (ret < 0)525 return ret;526 }527 528 return 0;529}530 531static int smb347_set_temp_limits(struct smb347_charger *smb)532{533 unsigned int id = smb->id;534 bool enable_therm_monitor = false;535 int ret = 0;536 int val;537 538 if (smb->chip_temp_threshold) {539 val = smb->chip_temp_threshold;540 541 /* degree C */542 val = clamp_val(val, 100, 130) - 100;543 val /= 10;544 545 ret = regmap_update_bits(smb->regmap, CFG_OTG,546 CFG_OTG_TEMP_THRESHOLD_MASK,547 val << CFG_OTG_TEMP_THRESHOLD_SHIFT);548 if (ret < 0)549 return ret;550 }551 552 if (smb->soft_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {553 val = smb->soft_cold_temp_limit;554 555 val = clamp_val(val, 0, 15);556 val /= 5;557 /* this goes from higher to lower so invert the value */558 val = ~val & 0x3;559 560 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,561 CFG_TEMP_LIMIT_SOFT_COLD_MASK,562 val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT);563 if (ret < 0)564 return ret;565 566 enable_therm_monitor = true;567 }568 569 if (smb->soft_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {570 val = smb->soft_hot_temp_limit;571 572 val = clamp_val(val, 40, 55) - 40;573 val /= 5;574 575 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,576 CFG_TEMP_LIMIT_SOFT_HOT_MASK,577 val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT);578 if (ret < 0)579 return ret;580 581 enable_therm_monitor = true;582 }583 584 if (smb->hard_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {585 val = smb->hard_cold_temp_limit;586 587 val = clamp_val(val, -5, 10) + 5;588 val /= 5;589 /* this goes from higher to lower so invert the value */590 val = ~val & 0x3;591 592 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,593 CFG_TEMP_LIMIT_HARD_COLD_MASK,594 val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT);595 if (ret < 0)596 return ret;597 598 enable_therm_monitor = true;599 }600 601 if (smb->hard_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {602 val = smb->hard_hot_temp_limit;603 604 val = clamp_val(val, 50, 65) - 50;605 val /= 5;606 607 ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,608 CFG_TEMP_LIMIT_HARD_HOT_MASK,609 val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT);610 if (ret < 0)611 return ret;612 613 enable_therm_monitor = true;614 }615 616 /*617 * If any of the temperature limits are set, we also enable the618 * thermistor monitoring.619 *620 * When soft limits are hit, the device will start to compensate621 * current and/or voltage depending on the configuration.622 *623 * When hard limit is hit, the device will suspend charging624 * depending on the configuration.625 */626 if (enable_therm_monitor) {627 ret = regmap_update_bits(smb->regmap, CFG_THERM,628 CFG_THERM_MONITOR_DISABLED, 0);629 if (ret < 0)630 return ret;631 }632 633 if (smb->suspend_on_hard_temp_limit) {634 ret = regmap_update_bits(smb->regmap, CFG_SYSOK,635 CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED, 0);636 if (ret < 0)637 return ret;638 }639 640 if (smb->soft_temp_limit_compensation !=641 SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT) {642 val = smb->soft_temp_limit_compensation & 0x3;643 644 ret = regmap_update_bits(smb->regmap, CFG_THERM,645 CFG_THERM_SOFT_HOT_COMPENSATION_MASK,646 val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT);647 if (ret < 0)648 return ret;649 650 ret = regmap_update_bits(smb->regmap, CFG_THERM,651 CFG_THERM_SOFT_COLD_COMPENSATION_MASK,652 val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT);653 if (ret < 0)654 return ret;655 }656 657 if (smb->charge_current_compensation) {658 val = current_to_hw(ccc_tbl[id], ARRAY_SIZE(ccc_tbl[id]),659 smb->charge_current_compensation);660 if (val < 0)661 return val;662 663 ret = regmap_update_bits(smb->regmap, CFG_OTG,664 CFG_OTG_CC_COMPENSATION_MASK,665 (val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT);666 if (ret < 0)667 return ret;668 }669 670 return ret;671}672 673/*674 * smb347_set_writable - enables/disables writing to non-volatile registers675 * @smb: pointer to smb347 charger instance676 *677 * You can enable/disable writing to the non-volatile configuration678 * registers by calling this function.679 *680 * Returns %0 on success and negative errno in case of failure.681 */682static int smb347_set_writable(struct smb347_charger *smb, bool writable,683 bool irq_toggle)684{685 struct i2c_client *client = to_i2c_client(smb->dev);686 int ret;687 688 if (writable && irq_toggle && !smb->irq_unsupported)689 disable_irq(client->irq);690 691 ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_ALLOW_WRITE,692 writable ? CMD_A_ALLOW_WRITE : 0);693 694 if ((!writable || ret) && irq_toggle && !smb->irq_unsupported)695 enable_irq(client->irq);696 697 return ret;698}699 700static int smb347_hw_init(struct smb347_charger *smb)701{702 unsigned int val;703 int ret;704 705 ret = smb347_set_writable(smb, true, false);706 if (ret < 0)707 return ret;708 709 /*710 * Program the platform specific configuration values to the device711 * first.712 */713 ret = smb347_set_charge_current(smb);714 if (ret < 0)715 goto fail;716 717 ret = smb347_set_current_limits(smb);718 if (ret < 0)719 goto fail;720 721 ret = smb347_set_voltage_limits(smb);722 if (ret < 0)723 goto fail;724 725 ret = smb347_set_temp_limits(smb);726 if (ret < 0)727 goto fail;728 729 /* If USB charging is disabled we put the USB in suspend mode */730 if (!smb->use_usb) {731 ret = regmap_update_bits(smb->regmap, CMD_A,732 CMD_A_SUSPEND_ENABLED,733 CMD_A_SUSPEND_ENABLED);734 if (ret < 0)735 goto fail;736 }737 738 /*739 * If configured by platform data, we enable hardware Auto-OTG740 * support for driving VBUS. Otherwise we disable it.741 */742 ret = regmap_update_bits(smb->regmap, CFG_OTHER, CFG_OTHER_RID_MASK,743 smb->use_usb_otg ? CFG_OTHER_RID_ENABLED_AUTO_OTG : 0);744 if (ret < 0)745 goto fail;746 747 /* Activate pin control, making it writable. */748 switch (smb->enable_control) {749 case SMB3XX_CHG_ENABLE_PIN_ACTIVE_LOW:750 case SMB3XX_CHG_ENABLE_PIN_ACTIVE_HIGH:751 ret = regmap_set_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL);752 if (ret < 0)753 goto fail;754 }755 756 /*757 * Make the charging functionality controllable by a write to the758 * command register unless pin control is specified in the platform759 * data.760 */761 switch (smb->enable_control) {762 case SMB3XX_CHG_ENABLE_PIN_ACTIVE_LOW:763 val = CFG_PIN_EN_CTRL_ACTIVE_LOW;764 break;765 case SMB3XX_CHG_ENABLE_PIN_ACTIVE_HIGH:766 val = CFG_PIN_EN_CTRL_ACTIVE_HIGH;767 break;768 default:769 val = 0;770 break;771 }772 773 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL_MASK,774 val);775 if (ret < 0)776 goto fail;777 778 /* Disable Automatic Power Source Detection (APSD) interrupt. */779 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_APSD_IRQ, 0);780 if (ret < 0)781 goto fail;782 783 ret = smb347_update_ps_status(smb);784 if (ret < 0)785 goto fail;786 787 ret = smb347_start_stop_charging(smb);788 789fail:790 smb347_set_writable(smb, false, false);791 return ret;792}793 794static irqreturn_t smb347_interrupt(int irq, void *data)795{796 struct smb347_charger *smb = data;797 unsigned int stat_c, irqstat_c, irqstat_d, irqstat_e;798 bool handled = false;799 int ret;800 801 /* SMB347 it needs at least 20ms for setting IRQSTAT_E_*IN_UV_IRQ */802 usleep_range(25000, 35000);803 804 ret = regmap_read(smb->regmap, STAT_C, &stat_c);805 if (ret < 0) {806 dev_warn(smb->dev, "reading STAT_C failed\n");807 return IRQ_NONE;808 }809 810 ret = regmap_read(smb->regmap, IRQSTAT_C, &irqstat_c);811 if (ret < 0) {812 dev_warn(smb->dev, "reading IRQSTAT_C failed\n");813 return IRQ_NONE;814 }815 816 ret = regmap_read(smb->regmap, IRQSTAT_D, &irqstat_d);817 if (ret < 0) {818 dev_warn(smb->dev, "reading IRQSTAT_D failed\n");819 return IRQ_NONE;820 }821 822 ret = regmap_read(smb->regmap, IRQSTAT_E, &irqstat_e);823 if (ret < 0) {824 dev_warn(smb->dev, "reading IRQSTAT_E failed\n");825 return IRQ_NONE;826 }827 828 /*829 * If we get charger error we report the error back to user.830 * If the error is recovered charging will resume again.831 */832 if (stat_c & STAT_C_CHARGER_ERROR) {833 dev_err(smb->dev, "charging stopped due to charger error\n");834 if (smb->use_mains)835 power_supply_changed(smb->mains);836 if (smb->use_usb)837 power_supply_changed(smb->usb);838 handled = true;839 }840 841 /*842 * If we reached the termination current the battery is charged and843 * we can update the status now. Charging is automatically844 * disabled by the hardware.845 */846 if (irqstat_c & (IRQSTAT_C_TERMINATION_IRQ | IRQSTAT_C_TAPER_IRQ)) {847 if (irqstat_c & IRQSTAT_C_TERMINATION_STAT) {848 if (smb->use_mains)849 power_supply_changed(smb->mains);850 if (smb->use_usb)851 power_supply_changed(smb->usb);852 }853 dev_dbg(smb->dev, "going to HW maintenance mode\n");854 handled = true;855 }856 857 /*858 * If we got a charger timeout INT that means the charge859 * full is not detected with in charge timeout value.860 */861 if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_IRQ) {862 dev_dbg(smb->dev, "total Charge Timeout INT received\n");863 864 if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_STAT)865 dev_warn(smb->dev, "charging stopped due to timeout\n");866 if (smb->use_mains)867 power_supply_changed(smb->mains);868 if (smb->use_usb)869 power_supply_changed(smb->usb);870 handled = true;871 }872 873 /*874 * If we got an under voltage interrupt it means that AC/USB input875 * was connected or disconnected.876 */877 if (irqstat_e & (IRQSTAT_E_USBIN_UV_IRQ | IRQSTAT_E_DCIN_UV_IRQ)) {878 if (smb347_update_ps_status(smb) > 0) {879 smb347_start_stop_charging(smb);880 if (smb->use_mains)881 power_supply_changed(smb->mains);882 if (smb->use_usb)883 power_supply_changed(smb->usb);884 }885 handled = true;886 }887 888 return handled ? IRQ_HANDLED : IRQ_NONE;889}890 891static int smb347_irq_set(struct smb347_charger *smb, bool enable)892{893 int ret;894 895 if (smb->irq_unsupported)896 return 0;897 898 ret = smb347_set_writable(smb, true, true);899 if (ret < 0)900 return ret;901 902 /*903 * Enable/disable interrupts for:904 * - under voltage905 * - termination current reached906 * - charger timeout907 * - charger error908 */909 ret = regmap_update_bits(smb->regmap, CFG_FAULT_IRQ, 0xff,910 enable ? CFG_FAULT_IRQ_DCIN_UV : 0);911 if (ret < 0)912 goto fail;913 914 ret = regmap_update_bits(smb->regmap, CFG_STATUS_IRQ, 0xff,915 enable ? (CFG_STATUS_IRQ_TERMINATION_OR_TAPER |916 CFG_STATUS_IRQ_CHARGE_TIMEOUT) : 0);917 if (ret < 0)918 goto fail;919 920 ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CHARGER_ERROR,921 enable ? CFG_PIN_EN_CHARGER_ERROR : 0);922fail:923 smb347_set_writable(smb, false, true);924 return ret;925}926 927static inline int smb347_irq_enable(struct smb347_charger *smb)928{929 return smb347_irq_set(smb, true);930}931 932static inline int smb347_irq_disable(struct smb347_charger *smb)933{934 return smb347_irq_set(smb, false);935}936 937static int smb347_irq_init(struct smb347_charger *smb,938 struct i2c_client *client)939{940 int ret;941 942 smb->irq_unsupported = true;943 944 /*945 * Interrupt pin is optional. If it is connected, we setup the946 * interrupt support here.947 */948 if (!client->irq)949 return 0;950 951 ret = smb347_set_writable(smb, true, false);952 if (ret < 0)953 return ret;954 955 /*956 * Configure the STAT output to be suitable for interrupts: disable957 * all other output (except interrupts) and make it active low.958 */959 ret = regmap_update_bits(smb->regmap, CFG_STAT,960 CFG_STAT_ACTIVE_HIGH | CFG_STAT_DISABLED,961 CFG_STAT_DISABLED);962 963 smb347_set_writable(smb, false, false);964 965 if (ret < 0) {966 dev_warn(smb->dev, "failed to initialize IRQ: %d\n", ret);967 dev_warn(smb->dev, "disabling IRQ support\n");968 return 0;969 }970 971 ret = devm_request_threaded_irq(smb->dev, client->irq, NULL,972 smb347_interrupt, IRQF_ONESHOT,973 client->name, smb);974 if (ret)975 return ret;976 977 smb->irq_unsupported = false;978 979 ret = smb347_irq_enable(smb);980 if (ret < 0)981 return ret;982 983 return 0;984}985 986/*987 * Returns the constant charge current programmed988 * into the charger in uA.989 */990static int get_const_charge_current(struct smb347_charger *smb)991{992 unsigned int id = smb->id;993 int ret, intval;994 unsigned int v;995 996 if (!smb347_is_ps_online(smb))997 return -ENODATA;998 999 ret = regmap_read(smb->regmap, STAT_B, &v);1000 if (ret < 0)1001 return ret;1002 1003 /*1004 * The current value is composition of FCC and PCC values1005 * and we can detect which table to use from bit 5.1006 */1007 if (v & 0x20) {1008 intval = hw_to_current(fcc_tbl[id],1009 ARRAY_SIZE(fcc_tbl[id]), v & 7);1010 } else {1011 v >>= 3;1012 intval = hw_to_current(pcc_tbl[id],1013 ARRAY_SIZE(pcc_tbl[id]), v & 7);1014 }1015 1016 return intval;1017}1018 1019/*1020 * Returns the constant charge voltage programmed1021 * into the charger in uV.1022 */1023static int get_const_charge_voltage(struct smb347_charger *smb)1024{1025 int ret, intval;1026 unsigned int v;1027 1028 if (!smb347_is_ps_online(smb))1029 return -ENODATA;1030 1031 ret = regmap_read(smb->regmap, STAT_A, &v);1032 if (ret < 0)1033 return ret;1034 1035 v &= STAT_A_FLOAT_VOLTAGE_MASK;1036 if (v > 0x3d)1037 v = 0x3d;1038 1039 intval = 3500000 + v * 20000;1040 1041 return intval;1042}1043 1044static int smb347_get_charging_status(struct smb347_charger *smb,1045 struct power_supply *psy)1046{1047 int ret, status;1048 unsigned int val;1049 1050 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {1051 if (!smb->usb_online)1052 return POWER_SUPPLY_STATUS_DISCHARGING;1053 } else {1054 if (!smb->mains_online)1055 return POWER_SUPPLY_STATUS_DISCHARGING;1056 }1057 1058 ret = regmap_read(smb->regmap, STAT_C, &val);1059 if (ret < 0)1060 return ret;1061 1062 if ((val & STAT_C_CHARGER_ERROR) ||1063 (val & STAT_C_HOLDOFF_STAT)) {1064 /*1065 * set to NOT CHARGING upon charger error1066 * or charging has stopped.1067 */1068 status = POWER_SUPPLY_STATUS_NOT_CHARGING;1069 } else {1070 if ((val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT) {1071 /*1072 * set to charging if battery is in pre-charge,1073 * fast charge or taper charging mode.1074 */1075 status = POWER_SUPPLY_STATUS_CHARGING;1076 } else if (val & STAT_C_CHG_TERM) {1077 /*1078 * set the status to FULL if battery is not in pre1079 * charge, fast charge or taper charging mode AND1080 * charging is terminated at least once.1081 */1082 status = POWER_SUPPLY_STATUS_FULL;1083 } else {1084 /*1085 * in this case no charger error or termination1086 * occured but charging is not in progress!!!1087 */1088 status = POWER_SUPPLY_STATUS_NOT_CHARGING;1089 }1090 }1091 1092 return status;1093}1094 1095static int smb347_get_property_locked(struct power_supply *psy,1096 enum power_supply_property prop,1097 union power_supply_propval *val)1098{1099 struct smb347_charger *smb = power_supply_get_drvdata(psy);1100 int ret;1101 1102 switch (prop) {1103 case POWER_SUPPLY_PROP_STATUS:1104 ret = smb347_get_charging_status(smb, psy);1105 if (ret < 0)1106 return ret;1107 val->intval = ret;1108 break;1109 1110 case POWER_SUPPLY_PROP_CHARGE_TYPE:1111 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {1112 if (!smb->usb_online)1113 return -ENODATA;1114 } else {1115 if (!smb->mains_online)1116 return -ENODATA;1117 }1118 1119 /*1120 * We handle trickle and pre-charging the same, and taper1121 * and none the same.1122 */1123 switch (smb347_charging_status(smb)) {1124 case 1:1125 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;1126 break;1127 case 2:1128 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;1129 break;1130 default:1131 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;1132 break;1133 }1134 break;1135 1136 case POWER_SUPPLY_PROP_ONLINE:1137 if (psy->desc->type == POWER_SUPPLY_TYPE_USB)1138 val->intval = smb->usb_online;1139 else1140 val->intval = smb->mains_online;1141 break;1142 1143 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:1144 ret = get_const_charge_voltage(smb);1145 if (ret < 0)1146 return ret;1147 val->intval = ret;1148 break;1149 1150 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:1151 ret = get_const_charge_current(smb);1152 if (ret < 0)1153 return ret;1154 val->intval = ret;1155 break;1156 1157 default:1158 return -EINVAL;1159 }1160 1161 return 0;1162}1163 1164static int smb347_get_property(struct power_supply *psy,1165 enum power_supply_property prop,1166 union power_supply_propval *val)1167{1168 struct smb347_charger *smb = power_supply_get_drvdata(psy);1169 struct i2c_client *client = to_i2c_client(smb->dev);1170 int ret;1171 1172 if (!smb->irq_unsupported)1173 disable_irq(client->irq);1174 1175 ret = smb347_get_property_locked(psy, prop, val);1176 1177 if (!smb->irq_unsupported)1178 enable_irq(client->irq);1179 1180 return ret;1181}1182 1183static enum power_supply_property smb347_properties[] = {1184 POWER_SUPPLY_PROP_STATUS,1185 POWER_SUPPLY_PROP_CHARGE_TYPE,1186 POWER_SUPPLY_PROP_ONLINE,1187 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,1188 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,1189};1190 1191static bool smb347_volatile_reg(struct device *dev, unsigned int reg)1192{1193 switch (reg) {1194 case IRQSTAT_A:1195 case IRQSTAT_C:1196 case IRQSTAT_D:1197 case IRQSTAT_E:1198 case IRQSTAT_F:1199 case STAT_A:1200 case STAT_B:1201 case STAT_C:1202 case STAT_E:1203 return true;1204 }1205 1206 return false;1207}1208 1209static bool smb347_readable_reg(struct device *dev, unsigned int reg)1210{1211 switch (reg) {1212 case CFG_CHARGE_CURRENT:1213 case CFG_CURRENT_LIMIT:1214 case CFG_FLOAT_VOLTAGE:1215 case CFG_STAT:1216 case CFG_PIN:1217 case CFG_THERM:1218 case CFG_SYSOK:1219 case CFG_OTHER:1220 case CFG_OTG:1221 case CFG_TEMP_LIMIT:1222 case CFG_FAULT_IRQ:1223 case CFG_STATUS_IRQ:1224 case CFG_ADDRESS:1225 case CMD_A:1226 case CMD_B:1227 case CMD_C:1228 return true;1229 }1230 1231 return smb347_volatile_reg(dev, reg);1232}1233 1234static void smb347_dt_parse_dev_info(struct smb347_charger *smb)1235{1236 struct device *dev = smb->dev;1237 1238 smb->soft_temp_limit_compensation =1239 SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT;1240 /*1241 * These properties come from the battery info, still we need to1242 * pre-initialize the values. See smb347_get_battery_info() below.1243 */1244 smb->soft_cold_temp_limit = SMB3XX_TEMP_USE_DEFAULT;1245 smb->hard_cold_temp_limit = SMB3XX_TEMP_USE_DEFAULT;1246 smb->soft_hot_temp_limit = SMB3XX_TEMP_USE_DEFAULT;1247 smb->hard_hot_temp_limit = SMB3XX_TEMP_USE_DEFAULT;1248 1249 /* Charging constraints */1250 device_property_read_u32(dev, "summit,fast-voltage-threshold-microvolt",1251 &smb->pre_to_fast_voltage);1252 device_property_read_u32(dev, "summit,mains-current-limit-microamp",1253 &smb->mains_current_limit);1254 device_property_read_u32(dev, "summit,usb-current-limit-microamp",1255 &smb->usb_hc_current_limit);1256 1257 /* For thermometer monitoring */1258 device_property_read_u32(dev, "summit,chip-temperature-threshold-celsius",1259 &smb->chip_temp_threshold);1260 device_property_read_u32(dev, "summit,soft-compensation-method",1261 &smb->soft_temp_limit_compensation);1262 device_property_read_u32(dev, "summit,charge-current-compensation-microamp",1263 &smb->charge_current_compensation);1264 1265 /* Supported charging mode */1266 smb->use_mains = device_property_read_bool(dev, "summit,enable-mains-charging");1267 smb->use_usb = device_property_read_bool(dev, "summit,enable-usb-charging");1268 smb->use_usb_otg = device_property_read_bool(dev, "summit,enable-otg-charging");1269 1270 /* Select charging control */1271 device_property_read_u32(dev, "summit,enable-charge-control",1272 &smb->enable_control);1273 1274 /*1275 * Polarity of INOK signal indicating presence of external power1276 * supply connected to the charger.1277 */1278 device_property_read_u32(dev, "summit,inok-polarity",1279 &smb->inok_polarity);1280}1281 1282static int smb347_get_battery_info(struct smb347_charger *smb)1283{1284 struct power_supply_battery_info *info;1285 struct power_supply *supply;1286 int err;1287 1288 if (smb->mains)1289 supply = smb->mains;1290 else1291 supply = smb->usb;1292 1293 err = power_supply_get_battery_info(supply, &info);1294 if (err == -ENXIO || err == -ENODEV)1295 return 0;1296 if (err)1297 return err;1298 1299 if (info->constant_charge_current_max_ua != -EINVAL)1300 smb->max_charge_current = info->constant_charge_current_max_ua;1301 1302 if (info->constant_charge_voltage_max_uv != -EINVAL)1303 smb->max_charge_voltage = info->constant_charge_voltage_max_uv;1304 1305 if (info->precharge_current_ua != -EINVAL)1306 smb->pre_charge_current = info->precharge_current_ua;1307 1308 if (info->charge_term_current_ua != -EINVAL)1309 smb->termination_current = info->charge_term_current_ua;1310 1311 if (info->temp_alert_min != INT_MIN)1312 smb->soft_cold_temp_limit = info->temp_alert_min;1313 1314 if (info->temp_alert_max != INT_MAX)1315 smb->soft_hot_temp_limit = info->temp_alert_max;1316 1317 if (info->temp_min != INT_MIN)1318 smb->hard_cold_temp_limit = info->temp_min;1319 1320 if (info->temp_max != INT_MAX)1321 smb->hard_hot_temp_limit = info->temp_max;1322 1323 /* Suspend when battery temperature is outside hard limits */1324 if (smb->hard_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT ||1325 smb->hard_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT)1326 smb->suspend_on_hard_temp_limit = true;1327 1328 return 0;1329}1330 1331static int smb347_usb_vbus_get_current_limit(struct regulator_dev *rdev)1332{1333 struct smb347_charger *smb = rdev_get_drvdata(rdev);1334 unsigned int val;1335 int ret;1336 1337 ret = regmap_read(smb->regmap, CFG_OTG, &val);1338 if (ret < 0)1339 return ret;1340 1341 /*1342 * It's unknown what happens if this bit is unset due to lack of1343 * access to the datasheet, assume it's limit-enable.1344 */1345 if (!(val & CFG_OTG_CURRENT_LIMIT_250mA))1346 return 0;1347 1348 return val & CFG_OTG_CURRENT_LIMIT_750mA ? 750000 : 250000;1349}1350 1351static int smb347_usb_vbus_set_new_current_limit(struct smb347_charger *smb,1352 int max_uA)1353{1354 const unsigned int mask = CFG_OTG_CURRENT_LIMIT_750mA |1355 CFG_OTG_CURRENT_LIMIT_250mA;1356 unsigned int val = CFG_OTG_CURRENT_LIMIT_250mA;1357 int ret;1358 1359 if (max_uA >= 750000)1360 val |= CFG_OTG_CURRENT_LIMIT_750mA;1361 1362 ret = regmap_update_bits(smb->regmap, CFG_OTG, mask, val);1363 if (ret < 0)1364 dev_err(smb->dev, "failed to change USB current limit\n");1365 1366 return ret;1367}1368 1369static int smb347_usb_vbus_set_current_limit(struct regulator_dev *rdev,1370 int min_uA, int max_uA)1371{1372 struct smb347_charger *smb = rdev_get_drvdata(rdev);1373 int ret;1374 1375 ret = smb347_set_writable(smb, true, true);1376 if (ret < 0)1377 return ret;1378 1379 ret = smb347_usb_vbus_set_new_current_limit(smb, max_uA);1380 smb347_set_writable(smb, false, true);1381 1382 return ret;1383}1384 1385static int smb347_usb_vbus_regulator_enable(struct regulator_dev *rdev)1386{1387 struct smb347_charger *smb = rdev_get_drvdata(rdev);1388 int ret, max_uA;1389 1390 ret = smb347_set_writable(smb, true, true);1391 if (ret < 0)1392 return ret;1393 1394 smb347_charging_disable(smb);1395 1396 if (device_property_read_bool(&rdev->dev, "summit,needs-inok-toggle")) {1397 unsigned int sysok = 0;1398 1399 if (smb->inok_polarity == SMB3XX_SYSOK_INOK_ACTIVE_LOW)1400 sysok = CFG_SYSOK_INOK_ACTIVE_HIGH;1401 1402 /*1403 * VBUS won't be powered if INOK is active, so we need to1404 * manually disable INOK on some platforms.1405 */1406 ret = regmap_update_bits(smb->regmap, CFG_SYSOK,1407 CFG_SYSOK_INOK_ACTIVE_HIGH, sysok);1408 if (ret < 0) {1409 dev_err(smb->dev, "failed to disable INOK\n");1410 goto done;1411 }1412 }1413 1414 ret = smb347_usb_vbus_get_current_limit(rdev);1415 if (ret < 0) {1416 dev_err(smb->dev, "failed to get USB VBUS current limit\n");1417 goto done;1418 }1419 1420 max_uA = ret;1421 1422 ret = smb347_usb_vbus_set_new_current_limit(smb, 250000);1423 if (ret < 0) {1424 dev_err(smb->dev, "failed to preset USB VBUS current limit\n");1425 goto done;1426 }1427 1428 ret = regmap_set_bits(smb->regmap, CMD_A, CMD_A_OTG_ENABLED);1429 if (ret < 0) {1430 dev_err(smb->dev, "failed to enable USB VBUS\n");1431 goto done;1432 }1433 1434 smb->usb_vbus_enabled = true;1435 1436 ret = smb347_usb_vbus_set_new_current_limit(smb, max_uA);1437 if (ret < 0) {1438 dev_err(smb->dev, "failed to restore USB VBUS current limit\n");1439 goto done;1440 }1441done:1442 smb347_set_writable(smb, false, true);1443 1444 return ret;1445}1446 1447static int smb347_usb_vbus_regulator_disable(struct regulator_dev *rdev)1448{1449 struct smb347_charger *smb = rdev_get_drvdata(rdev);1450 int ret;1451 1452 ret = smb347_set_writable(smb, true, true);1453 if (ret < 0)1454 return ret;1455 1456 ret = regmap_clear_bits(smb->regmap, CMD_A, CMD_A_OTG_ENABLED);1457 if (ret < 0) {1458 dev_err(smb->dev, "failed to disable USB VBUS\n");1459 goto done;1460 }1461 1462 smb->usb_vbus_enabled = false;1463 1464 if (device_property_read_bool(&rdev->dev, "summit,needs-inok-toggle")) {1465 unsigned int sysok = 0;1466 1467 if (smb->inok_polarity == SMB3XX_SYSOK_INOK_ACTIVE_HIGH)1468 sysok = CFG_SYSOK_INOK_ACTIVE_HIGH;1469 1470 ret = regmap_update_bits(smb->regmap, CFG_SYSOK,1471 CFG_SYSOK_INOK_ACTIVE_HIGH, sysok);1472 if (ret < 0) {1473 dev_err(smb->dev, "failed to enable INOK\n");1474 goto done;1475 }1476 }1477 1478 smb347_start_stop_charging(smb);1479done:1480 smb347_set_writable(smb, false, true);1481 1482 return ret;1483}1484 1485static const struct regmap_config smb347_regmap = {1486 .reg_bits = 8,1487 .val_bits = 8,1488 .max_register = SMB347_MAX_REGISTER,1489 .volatile_reg = smb347_volatile_reg,1490 .readable_reg = smb347_readable_reg,1491 .cache_type = REGCACHE_RBTREE,1492};1493 1494static const struct regulator_ops smb347_usb_vbus_regulator_ops = {1495 .is_enabled = regulator_is_enabled_regmap,1496 .enable = smb347_usb_vbus_regulator_enable,1497 .disable = smb347_usb_vbus_regulator_disable,1498 .get_current_limit = smb347_usb_vbus_get_current_limit,1499 .set_current_limit = smb347_usb_vbus_set_current_limit,1500};1501 1502static const struct power_supply_desc smb347_mains_desc = {1503 .name = "smb347-mains",1504 .type = POWER_SUPPLY_TYPE_MAINS,1505 .get_property = smb347_get_property,1506 .properties = smb347_properties,1507 .num_properties = ARRAY_SIZE(smb347_properties),1508};1509 1510static const struct power_supply_desc smb347_usb_desc = {1511 .name = "smb347-usb",1512 .type = POWER_SUPPLY_TYPE_USB,1513 .get_property = smb347_get_property,1514 .properties = smb347_properties,1515 .num_properties = ARRAY_SIZE(smb347_properties),1516};1517 1518static const struct regulator_desc smb347_usb_vbus_regulator_desc = {1519 .name = "smb347-usb-vbus",1520 .of_match = of_match_ptr("usb-vbus"),1521 .ops = &smb347_usb_vbus_regulator_ops,1522 .type = REGULATOR_VOLTAGE,1523 .owner = THIS_MODULE,1524 .enable_reg = CMD_A,1525 .enable_mask = CMD_A_OTG_ENABLED,1526 .enable_val = CMD_A_OTG_ENABLED,1527 .fixed_uV = 5000000,1528 .n_voltages = 1,1529};1530 1531static int smb347_probe(struct i2c_client *client)1532{1533 const struct i2c_device_id *id = i2c_client_get_device_id(client);1534 struct power_supply_config mains_usb_cfg = {};1535 struct regulator_config usb_rdev_cfg = {};1536 struct device *dev = &client->dev;1537 struct smb347_charger *smb;1538 int ret;1539 1540 smb = devm_kzalloc(dev, sizeof(*smb), GFP_KERNEL);1541 if (!smb)1542 return -ENOMEM;1543 smb->dev = &client->dev;1544 smb->id = id->driver_data;1545 i2c_set_clientdata(client, smb);1546 1547 smb347_dt_parse_dev_info(smb);1548 if (!smb->use_mains && !smb->use_usb)1549 return -EINVAL;1550 1551 smb->regmap = devm_regmap_init_i2c(client, &smb347_regmap);1552 if (IS_ERR(smb->regmap))1553 return PTR_ERR(smb->regmap);1554 1555 mains_usb_cfg.drv_data = smb;1556 mains_usb_cfg.of_node = dev->of_node;1557 if (smb->use_mains) {1558 smb->mains = devm_power_supply_register(dev, &smb347_mains_desc,1559 &mains_usb_cfg);1560 if (IS_ERR(smb->mains))1561 return PTR_ERR(smb->mains);1562 }1563 1564 if (smb->use_usb) {1565 smb->usb = devm_power_supply_register(dev, &smb347_usb_desc,1566 &mains_usb_cfg);1567 if (IS_ERR(smb->usb))1568 return PTR_ERR(smb->usb);1569 }1570 1571 ret = smb347_get_battery_info(smb);1572 if (ret)1573 return ret;1574 1575 ret = smb347_hw_init(smb);1576 if (ret < 0)1577 return ret;1578 1579 ret = smb347_irq_init(smb, client);1580 if (ret)1581 return ret;1582 1583 usb_rdev_cfg.dev = dev;1584 usb_rdev_cfg.driver_data = smb;1585 usb_rdev_cfg.regmap = smb->regmap;1586 1587 smb->usb_rdev = devm_regulator_register(dev,1588 &smb347_usb_vbus_regulator_desc,1589 &usb_rdev_cfg);1590 if (IS_ERR(smb->usb_rdev)) {1591 smb347_irq_disable(smb);1592 return PTR_ERR(smb->usb_rdev);1593 }1594 1595 return 0;1596}1597 1598static void smb347_remove(struct i2c_client *client)1599{1600 struct smb347_charger *smb = i2c_get_clientdata(client);1601 1602 smb347_usb_vbus_regulator_disable(smb->usb_rdev);1603 smb347_irq_disable(smb);1604}1605 1606static void smb347_shutdown(struct i2c_client *client)1607{1608 smb347_remove(client);1609}1610 1611static const struct i2c_device_id smb347_id[] = {1612 { "smb345", SMB345 },1613 { "smb347", SMB347 },1614 { "smb358", SMB358 },1615 { },1616};1617MODULE_DEVICE_TABLE(i2c, smb347_id);1618 1619static const struct of_device_id smb3xx_of_match[] = {1620 { .compatible = "summit,smb345" },1621 { .compatible = "summit,smb347" },1622 { .compatible = "summit,smb358" },1623 { },1624};1625MODULE_DEVICE_TABLE(of, smb3xx_of_match);1626 1627static struct i2c_driver smb347_driver = {1628 .driver = {1629 .name = "smb347",1630 .of_match_table = smb3xx_of_match,1631 },1632 .probe = smb347_probe,1633 .remove = smb347_remove,1634 .shutdown = smb347_shutdown,1635 .id_table = smb347_id,1636};1637module_i2c_driver(smb347_driver);1638 1639MODULE_AUTHOR("Bruce E. Robertson <bruce.e.robertson@intel.com>");1640MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");1641MODULE_DESCRIPTION("SMB347 battery charger driver");1642MODULE_LICENSE("GPL");1643