1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Spreadtrum Communications Inc.
4 #include <linux/gpio/consumer.h>
5 #include <linux/iio/consumer.h>
6 #include <linux/interrupt.h>
7 #include <linux/kernel.h>
8 #include <linux/math64.h>
9 #include <linux/module.h>
10 #include <linux/nvmem-consumer.h>
12 #include <linux/platform_device.h>
13 #include <linux/power_supply.h>
14 #include <linux/regmap.h>
15 #include <linux/slab.h>
17 /* PMIC global control registers definition */
18 #define SC27XX_MODULE_EN0 0xc08
19 #define SC27XX_CLK_EN0 0xc18
20 #define SC27XX_FGU_EN BIT(7)
21 #define SC27XX_FGU_RTC_EN BIT(6)
23 /* FGU registers definition */
24 #define SC27XX_FGU_START 0x0
25 #define SC27XX_FGU_CONFIG 0x4
26 #define SC27XX_FGU_ADC_CONFIG 0x8
27 #define SC27XX_FGU_STATUS 0xc
28 #define SC27XX_FGU_INT_EN 0x10
29 #define SC27XX_FGU_INT_CLR 0x14
30 #define SC27XX_FGU_INT_STS 0x1c
31 #define SC27XX_FGU_VOLTAGE 0x20
32 #define SC27XX_FGU_OCV 0x24
33 #define SC27XX_FGU_POCV 0x28
34 #define SC27XX_FGU_CURRENT 0x2c
35 #define SC27XX_FGU_LOW_OVERLOAD 0x34
36 #define SC27XX_FGU_CLBCNT_SETH 0x50
37 #define SC27XX_FGU_CLBCNT_SETL 0x54
38 #define SC27XX_FGU_CLBCNT_DELTH 0x58
39 #define SC27XX_FGU_CLBCNT_DELTL 0x5c
40 #define SC27XX_FGU_CLBCNT_VALH 0x68
41 #define SC27XX_FGU_CLBCNT_VALL 0x6c
42 #define SC27XX_FGU_CLBCNT_QMAXL 0x74
43 #define SC27XX_FGU_USER_AREA_SET 0xa0
44 #define SC27XX_FGU_USER_AREA_CLEAR 0xa4
45 #define SC27XX_FGU_USER_AREA_STATUS 0xa8
46 #define SC27XX_FGU_VOLTAGE_BUF 0xd0
47 #define SC27XX_FGU_CURRENT_BUF 0xf0
49 #define SC27XX_WRITE_SELCLB_EN BIT(0)
50 #define SC27XX_FGU_CLBCNT_MASK GENMASK(15, 0)
51 #define SC27XX_FGU_CLBCNT_SHIFT 16
52 #define SC27XX_FGU_LOW_OVERLOAD_MASK GENMASK(12, 0)
54 #define SC27XX_FGU_INT_MASK GENMASK(9, 0)
55 #define SC27XX_FGU_LOW_OVERLOAD_INT BIT(0)
56 #define SC27XX_FGU_CLBCNT_DELTA_INT BIT(2)
58 #define SC27XX_FGU_MODE_AREA_MASK GENMASK(15, 12)
59 #define SC27XX_FGU_CAP_AREA_MASK GENMASK(11, 0)
60 #define SC27XX_FGU_MODE_AREA_SHIFT 12
62 #define SC27XX_FGU_FIRST_POWERTON GENMASK(3, 0)
63 #define SC27XX_FGU_DEFAULT_CAP GENMASK(11, 0)
64 #define SC27XX_FGU_NORMAIL_POWERTON 0x5
66 #define SC27XX_FGU_CUR_BASIC_ADC 8192
67 #define SC27XX_FGU_SAMPLE_HZ 2
69 #define SC27XX_FGU_IDEAL_RESISTANCE 20000
72 * struct sc27xx_fgu_data: describe the FGU device
73 * @regmap: regmap for register access
74 * @dev: platform device
75 * @battery: battery power supply
76 * @base: the base offset for the controller
77 * @lock: protect the structure
78 * @gpiod: GPIO for battery detection
79 * @channel: IIO channel to get battery temperature
80 * @charge_chan: IIO channel to get charge voltage
81 * @internal_resist: the battery internal resistance in mOhm
82 * @total_cap: the total capacity of the battery in mAh
83 * @init_cap: the initial capacity of the battery in mAh
84 * @alarm_cap: the alarm capacity
85 * @init_clbcnt: the initial coulomb counter
86 * @max_volt: the maximum constant input voltage in millivolt
87 * @min_volt: the minimum drained battery voltage in microvolt
88 * @boot_volt: the voltage measured during boot in microvolt
89 * @table_len: the capacity table length
90 * @resist_table_len: the resistance table length
91 * @cur_1000ma_adc: ADC value corresponding to 1000 mA
92 * @vol_1000mv_adc: ADC value corresponding to 1000 mV
93 * @calib_resist: the real resistance of coulomb counter chip in uOhm
94 * @cap_table: capacity table with corresponding ocv
95 * @resist_table: resistance percent table with corresponding temperature
97 struct sc27xx_fgu_data {
98 struct regmap *regmap;
100 struct power_supply *battery;
103 struct gpio_desc *gpiod;
104 struct iio_channel *channel;
105 struct iio_channel *charge_chan;
116 int resist_table_len;
120 struct power_supply_battery_ocv_table *cap_table;
121 struct power_supply_resistance_temp_table *resist_table;
124 static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity);
125 static void sc27xx_fgu_capacity_calibration(struct sc27xx_fgu_data *data,
126 int cap, bool int_mode);
127 static void sc27xx_fgu_adjust_cap(struct sc27xx_fgu_data *data, int cap);
128 static int sc27xx_fgu_get_temp(struct sc27xx_fgu_data *data, int *temp);
130 static const char * const sc27xx_charger_supply_name[] = {
137 static int sc27xx_fgu_adc_to_current(struct sc27xx_fgu_data *data, s64 adc)
139 return DIV_S64_ROUND_CLOSEST(adc * 1000, data->cur_1000ma_adc);
142 static int sc27xx_fgu_adc_to_voltage(struct sc27xx_fgu_data *data, s64 adc)
144 return DIV_S64_ROUND_CLOSEST(adc * 1000, data->vol_1000mv_adc);
147 static int sc27xx_fgu_voltage_to_adc(struct sc27xx_fgu_data *data, int vol)
149 return DIV_ROUND_CLOSEST(vol * data->vol_1000mv_adc, 1000);
152 static bool sc27xx_fgu_is_first_poweron(struct sc27xx_fgu_data *data)
154 int ret, status, cap, mode;
156 ret = regmap_read(data->regmap,
157 data->base + SC27XX_FGU_USER_AREA_STATUS, &status);
162 * We use low 4 bits to save the last battery capacity and high 12 bits
163 * to save the system boot mode.
165 mode = (status & SC27XX_FGU_MODE_AREA_MASK) >> SC27XX_FGU_MODE_AREA_SHIFT;
166 cap = status & SC27XX_FGU_CAP_AREA_MASK;
169 * When FGU has been powered down, the user area registers became
170 * default value (0xffff), which can be used to valid if the system is
171 * first power on or not.
173 if (mode == SC27XX_FGU_FIRST_POWERTON || cap == SC27XX_FGU_DEFAULT_CAP)
179 static int sc27xx_fgu_save_boot_mode(struct sc27xx_fgu_data *data,
184 ret = regmap_update_bits(data->regmap,
185 data->base + SC27XX_FGU_USER_AREA_CLEAR,
186 SC27XX_FGU_MODE_AREA_MASK,
187 SC27XX_FGU_MODE_AREA_MASK);
192 * Since the user area registers are put on power always-on region,
193 * then these registers changing time will be a little long. Thus
194 * here we should delay 200us to wait until values are updated
195 * successfully according to the datasheet.
199 ret = regmap_update_bits(data->regmap,
200 data->base + SC27XX_FGU_USER_AREA_SET,
201 SC27XX_FGU_MODE_AREA_MASK,
202 boot_mode << SC27XX_FGU_MODE_AREA_SHIFT);
207 * Since the user area registers are put on power always-on region,
208 * then these registers changing time will be a little long. Thus
209 * here we should delay 200us to wait until values are updated
210 * successfully according to the datasheet.
215 * According to the datasheet, we should set the USER_AREA_CLEAR to 0 to
216 * make the user area data available, otherwise we can not save the user
219 return regmap_update_bits(data->regmap,
220 data->base + SC27XX_FGU_USER_AREA_CLEAR,
221 SC27XX_FGU_MODE_AREA_MASK, 0);
224 static int sc27xx_fgu_save_last_cap(struct sc27xx_fgu_data *data, int cap)
228 ret = regmap_update_bits(data->regmap,
229 data->base + SC27XX_FGU_USER_AREA_CLEAR,
230 SC27XX_FGU_CAP_AREA_MASK,
231 SC27XX_FGU_CAP_AREA_MASK);
236 * Since the user area registers are put on power always-on region,
237 * then these registers changing time will be a little long. Thus
238 * here we should delay 200us to wait until values are updated
239 * successfully according to the datasheet.
243 ret = regmap_update_bits(data->regmap,
244 data->base + SC27XX_FGU_USER_AREA_SET,
245 SC27XX_FGU_CAP_AREA_MASK, cap);
250 * Since the user area registers are put on power always-on region,
251 * then these registers changing time will be a little long. Thus
252 * here we should delay 200us to wait until values are updated
253 * successfully according to the datasheet.
258 * According to the datasheet, we should set the USER_AREA_CLEAR to 0 to
259 * make the user area data available, otherwise we can not save the user
262 return regmap_update_bits(data->regmap,
263 data->base + SC27XX_FGU_USER_AREA_CLEAR,
264 SC27XX_FGU_CAP_AREA_MASK, 0);
267 static int sc27xx_fgu_read_last_cap(struct sc27xx_fgu_data *data, int *cap)
271 ret = regmap_read(data->regmap,
272 data->base + SC27XX_FGU_USER_AREA_STATUS, &value);
276 *cap = value & SC27XX_FGU_CAP_AREA_MASK;
281 * When system boots on, we can not read battery capacity from coulomb
282 * registers, since now the coulomb registers are invalid. So we should
283 * calculate the battery open circuit voltage, and get current battery
284 * capacity according to the capacity table.
286 static int sc27xx_fgu_get_boot_capacity(struct sc27xx_fgu_data *data, int *cap)
288 int volt, cur, oci, ocv, ret;
289 bool is_first_poweron = sc27xx_fgu_is_first_poweron(data);
292 * If system is not the first power on, we should use the last saved
293 * battery capacity as the initial battery capacity. Otherwise we should
294 * re-calculate the initial battery capacity.
296 if (!is_first_poweron) {
297 ret = sc27xx_fgu_read_last_cap(data, cap);
301 return sc27xx_fgu_save_boot_mode(data, SC27XX_FGU_NORMAIL_POWERTON);
305 * After system booting on, the SC27XX_FGU_CLBCNT_QMAXL register saved
306 * the first sampled open circuit current.
308 ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_QMAXL,
314 oci = sc27xx_fgu_adc_to_current(data, cur - SC27XX_FGU_CUR_BASIC_ADC);
317 * Should get the OCV from SC27XX_FGU_POCV register at the system
318 * beginning. It is ADC values reading from registers which need to
319 * convert the corresponding voltage.
321 ret = regmap_read(data->regmap, data->base + SC27XX_FGU_POCV, &volt);
325 volt = sc27xx_fgu_adc_to_voltage(data, volt);
326 ocv = volt * 1000 - oci * data->internal_resist;
327 data->boot_volt = ocv;
330 * Parse the capacity table to look up the correct capacity percent
331 * according to current battery's corresponding OCV values.
333 *cap = power_supply_ocv2cap_simple(data->cap_table, data->table_len,
336 ret = sc27xx_fgu_save_last_cap(data, *cap);
340 return sc27xx_fgu_save_boot_mode(data, SC27XX_FGU_NORMAIL_POWERTON);
343 static int sc27xx_fgu_set_clbcnt(struct sc27xx_fgu_data *data, int clbcnt)
347 ret = regmap_update_bits(data->regmap,
348 data->base + SC27XX_FGU_CLBCNT_SETL,
349 SC27XX_FGU_CLBCNT_MASK, clbcnt);
353 ret = regmap_update_bits(data->regmap,
354 data->base + SC27XX_FGU_CLBCNT_SETH,
355 SC27XX_FGU_CLBCNT_MASK,
356 clbcnt >> SC27XX_FGU_CLBCNT_SHIFT);
360 return regmap_update_bits(data->regmap, data->base + SC27XX_FGU_START,
361 SC27XX_WRITE_SELCLB_EN,
362 SC27XX_WRITE_SELCLB_EN);
365 static int sc27xx_fgu_get_clbcnt(struct sc27xx_fgu_data *data, int *clb_cnt)
369 ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALL,
374 ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CLBCNT_VALH,
379 *clb_cnt = ccl & SC27XX_FGU_CLBCNT_MASK;
380 *clb_cnt |= (cch & SC27XX_FGU_CLBCNT_MASK) << SC27XX_FGU_CLBCNT_SHIFT;
385 static int sc27xx_fgu_get_vol_now(struct sc27xx_fgu_data *data, int *val)
390 ret = regmap_read(data->regmap, data->base + SC27XX_FGU_VOLTAGE_BUF,
396 * It is ADC values reading from registers which need to convert to
397 * corresponding voltage values.
399 *val = sc27xx_fgu_adc_to_voltage(data, vol);
404 static int sc27xx_fgu_get_cur_now(struct sc27xx_fgu_data *data, int *val)
409 ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CURRENT_BUF,
415 * It is ADC values reading from registers which need to convert to
416 * corresponding current values.
418 *val = sc27xx_fgu_adc_to_current(data, cur - SC27XX_FGU_CUR_BASIC_ADC);
423 static int sc27xx_fgu_get_capacity(struct sc27xx_fgu_data *data, int *cap)
425 int ret, cur_clbcnt, delta_clbcnt, delta_cap, temp;
427 /* Get current coulomb counters firstly */
428 ret = sc27xx_fgu_get_clbcnt(data, &cur_clbcnt);
432 delta_clbcnt = cur_clbcnt - data->init_clbcnt;
435 * Convert coulomb counter to delta capacity (mAh), and set multiplier
436 * as 10 to improve the precision.
438 temp = DIV_ROUND_CLOSEST(delta_clbcnt * 10, 36 * SC27XX_FGU_SAMPLE_HZ);
439 temp = sc27xx_fgu_adc_to_current(data, temp / 1000);
442 * Convert to capacity percent of the battery total capacity,
443 * and multiplier is 100 too.
445 delta_cap = DIV_ROUND_CLOSEST(temp * 100, data->total_cap);
446 *cap = delta_cap + data->init_cap;
448 /* Calibrate the battery capacity in a normal range. */
449 sc27xx_fgu_capacity_calibration(data, *cap, false);
454 static int sc27xx_fgu_get_vbat_vol(struct sc27xx_fgu_data *data, int *val)
458 ret = regmap_read(data->regmap, data->base + SC27XX_FGU_VOLTAGE, &vol);
463 * It is ADC values reading from registers which need to convert to
464 * corresponding voltage values.
466 *val = sc27xx_fgu_adc_to_voltage(data, vol);
471 static int sc27xx_fgu_get_current(struct sc27xx_fgu_data *data, int *val)
475 ret = regmap_read(data->regmap, data->base + SC27XX_FGU_CURRENT, &cur);
480 * It is ADC values reading from registers which need to convert to
481 * corresponding current values.
483 *val = sc27xx_fgu_adc_to_current(data, cur - SC27XX_FGU_CUR_BASIC_ADC);
488 static int sc27xx_fgu_get_vbat_ocv(struct sc27xx_fgu_data *data, int *val)
490 int vol, cur, ret, temp, resistance;
492 ret = sc27xx_fgu_get_vbat_vol(data, &vol);
496 ret = sc27xx_fgu_get_current(data, &cur);
500 resistance = data->internal_resist;
501 if (data->resist_table_len > 0) {
502 ret = sc27xx_fgu_get_temp(data, &temp);
506 resistance = power_supply_temp2resist_simple(data->resist_table,
507 data->resist_table_len, temp);
508 resistance = data->internal_resist * resistance / 100;
511 /* Return the battery OCV in micro volts. */
512 *val = vol * 1000 - cur * resistance;
517 static int sc27xx_fgu_get_charge_vol(struct sc27xx_fgu_data *data, int *val)
521 ret = iio_read_channel_processed(data->charge_chan, &vol);
529 static int sc27xx_fgu_get_temp(struct sc27xx_fgu_data *data, int *temp)
531 return iio_read_channel_processed(data->channel, temp);
534 static int sc27xx_fgu_get_health(struct sc27xx_fgu_data *data, int *health)
538 ret = sc27xx_fgu_get_vbat_vol(data, &vol);
542 if (vol > data->max_volt)
543 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
545 *health = POWER_SUPPLY_HEALTH_GOOD;
550 static int sc27xx_fgu_get_status(struct sc27xx_fgu_data *data, int *status)
552 union power_supply_propval val;
553 struct power_supply *psy;
554 int i, ret = -EINVAL;
556 for (i = 0; i < ARRAY_SIZE(sc27xx_charger_supply_name); i++) {
557 psy = power_supply_get_by_name(sc27xx_charger_supply_name[i]);
561 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS,
563 power_supply_put(psy);
567 *status = val.intval;
573 static int sc27xx_fgu_get_property(struct power_supply *psy,
574 enum power_supply_property psp,
575 union power_supply_propval *val)
577 struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy);
581 mutex_lock(&data->lock);
584 case POWER_SUPPLY_PROP_STATUS:
585 ret = sc27xx_fgu_get_status(data, &value);
592 case POWER_SUPPLY_PROP_HEALTH:
593 ret = sc27xx_fgu_get_health(data, &value);
600 case POWER_SUPPLY_PROP_PRESENT:
601 val->intval = data->bat_present;
604 case POWER_SUPPLY_PROP_TEMP:
605 ret = sc27xx_fgu_get_temp(data, &value);
612 case POWER_SUPPLY_PROP_TECHNOLOGY:
613 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
616 case POWER_SUPPLY_PROP_CAPACITY:
617 ret = sc27xx_fgu_get_capacity(data, &value);
624 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
625 ret = sc27xx_fgu_get_vbat_vol(data, &value);
629 val->intval = value * 1000;
632 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
633 ret = sc27xx_fgu_get_vbat_ocv(data, &value);
640 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
641 ret = sc27xx_fgu_get_charge_vol(data, &value);
648 case POWER_SUPPLY_PROP_CURRENT_AVG:
649 ret = sc27xx_fgu_get_current(data, &value);
653 val->intval = value * 1000;
656 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
657 val->intval = data->total_cap * 1000;
660 case POWER_SUPPLY_PROP_CHARGE_NOW:
661 ret = sc27xx_fgu_get_clbcnt(data, &value);
665 value = DIV_ROUND_CLOSEST(value * 10,
666 36 * SC27XX_FGU_SAMPLE_HZ);
667 val->intval = sc27xx_fgu_adc_to_current(data, value);
671 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
672 ret = sc27xx_fgu_get_vol_now(data, &value);
676 val->intval = value * 1000;
679 case POWER_SUPPLY_PROP_CURRENT_NOW:
680 ret = sc27xx_fgu_get_cur_now(data, &value);
684 val->intval = value * 1000;
687 case POWER_SUPPLY_PROP_VOLTAGE_BOOT:
688 val->intval = data->boot_volt;
697 mutex_unlock(&data->lock);
701 static int sc27xx_fgu_set_property(struct power_supply *psy,
702 enum power_supply_property psp,
703 const union power_supply_propval *val)
705 struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy);
708 mutex_lock(&data->lock);
711 case POWER_SUPPLY_PROP_CAPACITY:
712 ret = sc27xx_fgu_save_last_cap(data, val->intval);
714 dev_err(data->dev, "failed to save battery capacity\n");
717 case POWER_SUPPLY_PROP_CALIBRATE:
718 sc27xx_fgu_adjust_cap(data, val->intval);
722 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
723 data->total_cap = val->intval / 1000;
731 mutex_unlock(&data->lock);
736 static void sc27xx_fgu_external_power_changed(struct power_supply *psy)
738 struct sc27xx_fgu_data *data = power_supply_get_drvdata(psy);
740 power_supply_changed(data->battery);
743 static int sc27xx_fgu_property_is_writeable(struct power_supply *psy,
744 enum power_supply_property psp)
746 return psp == POWER_SUPPLY_PROP_CAPACITY ||
747 psp == POWER_SUPPLY_PROP_CALIBRATE ||
748 psp == POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
751 static enum power_supply_property sc27xx_fgu_props[] = {
752 POWER_SUPPLY_PROP_STATUS,
753 POWER_SUPPLY_PROP_HEALTH,
754 POWER_SUPPLY_PROP_PRESENT,
755 POWER_SUPPLY_PROP_TEMP,
756 POWER_SUPPLY_PROP_TECHNOLOGY,
757 POWER_SUPPLY_PROP_CAPACITY,
758 POWER_SUPPLY_PROP_VOLTAGE_NOW,
759 POWER_SUPPLY_PROP_VOLTAGE_OCV,
760 POWER_SUPPLY_PROP_VOLTAGE_AVG,
761 POWER_SUPPLY_PROP_VOLTAGE_BOOT,
762 POWER_SUPPLY_PROP_CURRENT_NOW,
763 POWER_SUPPLY_PROP_CURRENT_AVG,
764 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
765 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
766 POWER_SUPPLY_PROP_CALIBRATE,
767 POWER_SUPPLY_PROP_CHARGE_NOW
770 static const struct power_supply_desc sc27xx_fgu_desc = {
771 .name = "sc27xx-fgu",
772 .type = POWER_SUPPLY_TYPE_BATTERY,
773 .properties = sc27xx_fgu_props,
774 .num_properties = ARRAY_SIZE(sc27xx_fgu_props),
775 .get_property = sc27xx_fgu_get_property,
776 .set_property = sc27xx_fgu_set_property,
777 .external_power_changed = sc27xx_fgu_external_power_changed,
778 .property_is_writeable = sc27xx_fgu_property_is_writeable,
782 static void sc27xx_fgu_adjust_cap(struct sc27xx_fgu_data *data, int cap)
786 data->init_cap = cap;
787 ret = sc27xx_fgu_get_clbcnt(data, &data->init_clbcnt);
789 dev_err(data->dev, "failed to get init coulomb counter\n");
792 static void sc27xx_fgu_capacity_calibration(struct sc27xx_fgu_data *data,
793 int cap, bool int_mode)
795 int ret, ocv, chg_sts, adc;
797 ret = sc27xx_fgu_get_vbat_ocv(data, &ocv);
799 dev_err(data->dev, "get battery ocv error.\n");
803 ret = sc27xx_fgu_get_status(data, &chg_sts);
805 dev_err(data->dev, "get charger status error.\n");
810 * If we are in charging mode, then we do not need to calibrate the
813 if (chg_sts == POWER_SUPPLY_STATUS_CHARGING)
816 if ((ocv > data->cap_table[0].ocv && cap < 100) || cap > 100) {
818 * If current OCV value is larger than the max OCV value in
819 * OCV table, or the current capacity is larger than 100,
820 * we should force the inititial capacity to 100.
822 sc27xx_fgu_adjust_cap(data, 100);
823 } else if (ocv <= data->cap_table[data->table_len - 1].ocv) {
825 * If current OCV value is leass than the minimum OCV value in
826 * OCV table, we should force the inititial capacity to 0.
828 sc27xx_fgu_adjust_cap(data, 0);
829 } else if ((ocv > data->cap_table[data->table_len - 1].ocv && cap <= 0) ||
830 (ocv > data->min_volt && cap <= data->alarm_cap)) {
832 * If current OCV value is not matchable with current capacity,
833 * we should re-calculate current capacity by looking up the
836 int cur_cap = power_supply_ocv2cap_simple(data->cap_table,
837 data->table_len, ocv);
839 sc27xx_fgu_adjust_cap(data, cur_cap);
840 } else if (ocv <= data->min_volt) {
842 * If current OCV value is less than the low alarm voltage, but
843 * current capacity is larger than the alarm capacity, we should
844 * adjust the inititial capacity to alarm capacity.
846 if (cap > data->alarm_cap) {
847 sc27xx_fgu_adjust_cap(data, data->alarm_cap);
852 * If current capacity is equal with 0 or less than 0
853 * (some error occurs), we should adjust inititial
854 * capacity to the capacity corresponding to current OCV
857 cur_cap = power_supply_ocv2cap_simple(data->cap_table,
860 sc27xx_fgu_adjust_cap(data, cur_cap);
867 * After adjusting the battery capacity, we should set the
868 * lowest alarm voltage instead.
870 data->min_volt = data->cap_table[data->table_len - 1].ocv;
871 data->alarm_cap = power_supply_ocv2cap_simple(data->cap_table,
875 adc = sc27xx_fgu_voltage_to_adc(data, data->min_volt / 1000);
876 regmap_update_bits(data->regmap,
877 data->base + SC27XX_FGU_LOW_OVERLOAD,
878 SC27XX_FGU_LOW_OVERLOAD_MASK, adc);
882 static irqreturn_t sc27xx_fgu_interrupt(int irq, void *dev_id)
884 struct sc27xx_fgu_data *data = dev_id;
888 mutex_lock(&data->lock);
890 ret = regmap_read(data->regmap, data->base + SC27XX_FGU_INT_STS,
895 ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_INT_CLR,
901 * When low overload voltage interrupt happens, we should calibrate the
902 * battery capacity in lower voltage stage.
904 if (!(status & SC27XX_FGU_LOW_OVERLOAD_INT))
907 ret = sc27xx_fgu_get_capacity(data, &cap);
911 sc27xx_fgu_capacity_calibration(data, cap, true);
914 mutex_unlock(&data->lock);
916 power_supply_changed(data->battery);
920 static irqreturn_t sc27xx_fgu_bat_detection(int irq, void *dev_id)
922 struct sc27xx_fgu_data *data = dev_id;
925 mutex_lock(&data->lock);
927 state = gpiod_get_value_cansleep(data->gpiod);
929 dev_err(data->dev, "failed to get gpio state\n");
930 mutex_unlock(&data->lock);
931 return IRQ_RETVAL(state);
934 data->bat_present = !!state;
936 mutex_unlock(&data->lock);
938 power_supply_changed(data->battery);
942 static void sc27xx_fgu_disable(void *_data)
944 struct sc27xx_fgu_data *data = _data;
946 regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0);
947 regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0);
950 static int sc27xx_fgu_cap_to_clbcnt(struct sc27xx_fgu_data *data, int capacity)
953 * Get current capacity (mAh) = battery total capacity (mAh) *
954 * current capacity percent (capacity / 100).
956 int cur_cap = DIV_ROUND_CLOSEST(data->total_cap * capacity, 100);
959 * Convert current capacity (mAh) to coulomb counter according to the
960 * formula: 1 mAh =3.6 coulomb.
962 return DIV_ROUND_CLOSEST(cur_cap * 36 * data->cur_1000ma_adc * SC27XX_FGU_SAMPLE_HZ, 10);
965 static int sc27xx_fgu_calibration(struct sc27xx_fgu_data *data)
967 struct nvmem_cell *cell;
968 int calib_data, cal_4200mv;
972 cell = nvmem_cell_get(data->dev, "fgu_calib");
974 return PTR_ERR(cell);
976 buf = nvmem_cell_read(cell, &len);
977 nvmem_cell_put(cell);
982 memcpy(&calib_data, buf, min(len, sizeof(u32)));
985 * Get the ADC value corresponding to 4200 mV from eFuse controller
986 * according to below formula. Then convert to ADC values corresponding
987 * to 1000 mV and 1000 mA.
989 cal_4200mv = (calib_data & 0x1ff) + 6963 - 4096 - 256;
990 data->vol_1000mv_adc = DIV_ROUND_CLOSEST(cal_4200mv * 10, 42);
991 data->cur_1000ma_adc =
992 DIV_ROUND_CLOSEST(data->vol_1000mv_adc * 4 * data->calib_resist,
993 SC27XX_FGU_IDEAL_RESISTANCE);
999 static int sc27xx_fgu_hw_init(struct sc27xx_fgu_data *data)
1001 struct power_supply_battery_info info = { };
1002 struct power_supply_battery_ocv_table *table;
1003 int ret, delta_clbcnt, alarm_adc;
1005 ret = power_supply_get_battery_info(data->battery, &info);
1007 dev_err(data->dev, "failed to get battery information\n");
1011 data->total_cap = info.charge_full_design_uah / 1000;
1012 data->max_volt = info.constant_charge_voltage_max_uv / 1000;
1013 data->internal_resist = info.factory_internal_resistance_uohm / 1000;
1014 data->min_volt = info.voltage_min_design_uv;
1017 * For SC27XX fuel gauge device, we only use one ocv-capacity
1018 * table in normal temperature 20 Celsius.
1020 table = power_supply_find_ocv2cap_table(&info, 20, &data->table_len);
1024 data->cap_table = devm_kmemdup(data->dev, table,
1025 data->table_len * sizeof(*table),
1027 if (!data->cap_table) {
1028 power_supply_put_battery_info(data->battery, &info);
1032 data->alarm_cap = power_supply_ocv2cap_simple(data->cap_table,
1035 if (!data->alarm_cap)
1036 data->alarm_cap += 1;
1038 data->resist_table_len = info.resist_table_size;
1039 if (data->resist_table_len > 0) {
1040 data->resist_table = devm_kmemdup(data->dev, info.resist_table,
1041 data->resist_table_len *
1042 sizeof(struct power_supply_resistance_temp_table),
1044 if (!data->resist_table) {
1045 power_supply_put_battery_info(data->battery, &info);
1050 power_supply_put_battery_info(data->battery, &info);
1052 ret = sc27xx_fgu_calibration(data);
1056 /* Enable the FGU module */
1057 ret = regmap_update_bits(data->regmap, SC27XX_MODULE_EN0,
1058 SC27XX_FGU_EN, SC27XX_FGU_EN);
1060 dev_err(data->dev, "failed to enable fgu\n");
1064 /* Enable the FGU RTC clock to make it work */
1065 ret = regmap_update_bits(data->regmap, SC27XX_CLK_EN0,
1066 SC27XX_FGU_RTC_EN, SC27XX_FGU_RTC_EN);
1068 dev_err(data->dev, "failed to enable fgu RTC clock\n");
1072 ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_INT_CLR,
1073 SC27XX_FGU_INT_MASK, SC27XX_FGU_INT_MASK);
1075 dev_err(data->dev, "failed to clear interrupt status\n");
1080 * Set the voltage low overload threshold, which means when the battery
1081 * voltage is lower than this threshold, the controller will generate
1082 * one interrupt to notify.
1084 alarm_adc = sc27xx_fgu_voltage_to_adc(data, data->min_volt / 1000);
1085 ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_LOW_OVERLOAD,
1086 SC27XX_FGU_LOW_OVERLOAD_MASK, alarm_adc);
1088 dev_err(data->dev, "failed to set fgu low overload\n");
1093 * Set the coulomb counter delta threshold, that means when the coulomb
1094 * counter change is multiples of the delta threshold, the controller
1095 * will generate one interrupt to notify the users to update the battery
1096 * capacity. Now we set the delta threshold as a counter value of 1%
1099 delta_clbcnt = sc27xx_fgu_cap_to_clbcnt(data, 1);
1101 ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_CLBCNT_DELTL,
1102 SC27XX_FGU_CLBCNT_MASK, delta_clbcnt);
1104 dev_err(data->dev, "failed to set low delta coulomb counter\n");
1108 ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_CLBCNT_DELTH,
1109 SC27XX_FGU_CLBCNT_MASK,
1110 delta_clbcnt >> SC27XX_FGU_CLBCNT_SHIFT);
1112 dev_err(data->dev, "failed to set high delta coulomb counter\n");
1117 * Get the boot battery capacity when system powers on, which is used to
1118 * initialize the coulomb counter. After that, we can read the coulomb
1119 * counter to measure the battery capacity.
1121 ret = sc27xx_fgu_get_boot_capacity(data, &data->init_cap);
1123 dev_err(data->dev, "failed to get boot capacity\n");
1128 * Convert battery capacity to the corresponding initial coulomb counter
1129 * and set into coulomb counter registers.
1131 data->init_clbcnt = sc27xx_fgu_cap_to_clbcnt(data, data->init_cap);
1132 ret = sc27xx_fgu_set_clbcnt(data, data->init_clbcnt);
1134 dev_err(data->dev, "failed to initialize coulomb counter\n");
1141 regmap_update_bits(data->regmap, SC27XX_CLK_EN0, SC27XX_FGU_RTC_EN, 0);
1143 regmap_update_bits(data->regmap, SC27XX_MODULE_EN0, SC27XX_FGU_EN, 0);
1148 static int sc27xx_fgu_probe(struct platform_device *pdev)
1150 struct device *dev = &pdev->dev;
1151 struct device_node *np = dev->of_node;
1152 struct power_supply_config fgu_cfg = { };
1153 struct sc27xx_fgu_data *data;
1156 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
1160 data->regmap = dev_get_regmap(dev->parent, NULL);
1161 if (!data->regmap) {
1162 dev_err(dev, "failed to get regmap\n");
1166 ret = device_property_read_u32(dev, "reg", &data->base);
1168 dev_err(dev, "failed to get fgu address\n");
1172 ret = device_property_read_u32(&pdev->dev,
1173 "sprd,calib-resistance-micro-ohms",
1174 &data->calib_resist);
1177 "failed to get fgu calibration resistance\n");
1181 data->channel = devm_iio_channel_get(dev, "bat-temp");
1182 if (IS_ERR(data->channel)) {
1183 dev_err(dev, "failed to get IIO channel\n");
1184 return PTR_ERR(data->channel);
1187 data->charge_chan = devm_iio_channel_get(dev, "charge-vol");
1188 if (IS_ERR(data->charge_chan)) {
1189 dev_err(dev, "failed to get charge IIO channel\n");
1190 return PTR_ERR(data->charge_chan);
1193 data->gpiod = devm_gpiod_get(dev, "bat-detect", GPIOD_IN);
1194 if (IS_ERR(data->gpiod)) {
1195 dev_err(dev, "failed to get battery detection GPIO\n");
1196 return PTR_ERR(data->gpiod);
1199 ret = gpiod_get_value_cansleep(data->gpiod);
1201 dev_err(dev, "failed to get gpio state\n");
1205 data->bat_present = !!ret;
1206 mutex_init(&data->lock);
1208 platform_set_drvdata(pdev, data);
1210 fgu_cfg.drv_data = data;
1211 fgu_cfg.of_node = np;
1212 data->battery = devm_power_supply_register(dev, &sc27xx_fgu_desc,
1214 if (IS_ERR(data->battery)) {
1215 dev_err(dev, "failed to register power supply\n");
1216 return PTR_ERR(data->battery);
1219 ret = sc27xx_fgu_hw_init(data);
1221 dev_err(dev, "failed to initialize fgu hardware\n");
1225 ret = devm_add_action_or_reset(dev, sc27xx_fgu_disable, data);
1227 dev_err(dev, "failed to add fgu disable action\n");
1231 irq = platform_get_irq(pdev, 0);
1233 dev_err(dev, "no irq resource specified\n");
1237 ret = devm_request_threaded_irq(data->dev, irq, NULL,
1238 sc27xx_fgu_interrupt,
1239 IRQF_NO_SUSPEND | IRQF_ONESHOT,
1242 dev_err(data->dev, "failed to request fgu IRQ\n");
1246 irq = gpiod_to_irq(data->gpiod);
1248 dev_err(dev, "failed to translate GPIO to IRQ\n");
1252 ret = devm_request_threaded_irq(dev, irq, NULL,
1253 sc27xx_fgu_bat_detection,
1254 IRQF_ONESHOT | IRQF_TRIGGER_RISING |
1255 IRQF_TRIGGER_FALLING,
1258 dev_err(dev, "failed to request IRQ\n");
1265 #ifdef CONFIG_PM_SLEEP
1266 static int sc27xx_fgu_resume(struct device *dev)
1268 struct sc27xx_fgu_data *data = dev_get_drvdata(dev);
1271 ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_INT_EN,
1272 SC27XX_FGU_LOW_OVERLOAD_INT |
1273 SC27XX_FGU_CLBCNT_DELTA_INT, 0);
1275 dev_err(data->dev, "failed to disable fgu interrupts\n");
1282 static int sc27xx_fgu_suspend(struct device *dev)
1284 struct sc27xx_fgu_data *data = dev_get_drvdata(dev);
1285 int ret, status, ocv;
1287 ret = sc27xx_fgu_get_status(data, &status);
1292 * If we are charging, then no need to enable the FGU interrupts to
1293 * adjust the battery capacity.
1295 if (status != POWER_SUPPLY_STATUS_NOT_CHARGING &&
1296 status != POWER_SUPPLY_STATUS_DISCHARGING)
1299 ret = regmap_update_bits(data->regmap, data->base + SC27XX_FGU_INT_EN,
1300 SC27XX_FGU_LOW_OVERLOAD_INT,
1301 SC27XX_FGU_LOW_OVERLOAD_INT);
1303 dev_err(data->dev, "failed to enable low voltage interrupt\n");
1307 ret = sc27xx_fgu_get_vbat_ocv(data, &ocv);
1312 * If current OCV is less than the minimum voltage, we should enable the
1313 * coulomb counter threshold interrupt to notify events to adjust the
1316 if (ocv < data->min_volt) {
1317 ret = regmap_update_bits(data->regmap,
1318 data->base + SC27XX_FGU_INT_EN,
1319 SC27XX_FGU_CLBCNT_DELTA_INT,
1320 SC27XX_FGU_CLBCNT_DELTA_INT);
1323 "failed to enable coulomb threshold int\n");
1331 regmap_update_bits(data->regmap, data->base + SC27XX_FGU_INT_EN,
1332 SC27XX_FGU_LOW_OVERLOAD_INT, 0);
1337 static const struct dev_pm_ops sc27xx_fgu_pm_ops = {
1338 SET_SYSTEM_SLEEP_PM_OPS(sc27xx_fgu_suspend, sc27xx_fgu_resume)
1341 static const struct of_device_id sc27xx_fgu_of_match[] = {
1342 { .compatible = "sprd,sc2731-fgu", },
1345 MODULE_DEVICE_TABLE(of, sc27xx_fgu_of_match);
1347 static struct platform_driver sc27xx_fgu_driver = {
1348 .probe = sc27xx_fgu_probe,
1350 .name = "sc27xx-fgu",
1351 .of_match_table = sc27xx_fgu_of_match,
1352 .pm = &sc27xx_fgu_pm_ops,
1356 module_platform_driver(sc27xx_fgu_driver);
1358 MODULE_DESCRIPTION("Spreadtrum SC27XX PMICs Fual Gauge Unit Driver");
1359 MODULE_LICENSE("GPL v2");