2 * Copyright (C) ST-Ericsson AB 2012
4 * Main and Back-up battery management driver.
6 * Note: Backup battery management is required in case of Li-Ion battery and not
7 * for capacitive battery. HREF boards have capacitive battery and hence backup
8 * battery management is not used and the supported code is available in this
11 * License Terms: GNU General Public License v2
13 * Johan Palsson <johan.palsson@stericsson.com>
14 * Karl Komierowski <karl.komierowski@stericsson.com>
15 * Arun R Murthy <arun.murthy@stericsson.com>
18 #include <linux/init.h>
19 #include <linux/module.h>
20 #include <linux/device.h>
21 #include <linux/interrupt.h>
22 #include <linux/platform_device.h>
23 #include <linux/power_supply.h>
24 #include <linux/kobject.h>
25 #include <linux/slab.h>
26 #include <linux/delay.h>
27 #include <linux/time.h>
29 #include <linux/completion.h>
30 #include <linux/mfd/core.h>
31 #include <linux/mfd/abx500.h>
32 #include <linux/mfd/abx500/ab8500.h>
33 #include <linux/mfd/abx500/ab8500-bm.h>
34 #include <linux/mfd/abx500/ab8500-gpadc.h>
36 #define MILLI_TO_MICRO 1000
37 #define FG_LSB_IN_MA 1627
38 #define QLSB_NANO_AMP_HOURS_X10 1129
39 #define INS_CURR_TIMEOUT (3 * HZ)
41 #define SEC_TO_SAMPLE(S) (S * 4)
43 #define NBR_AVG_SAMPLES 20
45 #define LOW_BAT_CHECK_INTERVAL (2 * HZ)
47 #define VALID_CAPACITY_SEC (45 * 60) /* 45 minutes */
48 #define BATT_OK_MIN 2360 /* mV */
49 #define BATT_OK_INCREMENT 50 /* mV */
50 #define BATT_OK_MAX_NR_INCREMENTS 0xE
55 #define interpolate(x, x1, y1, x2, y2) \
56 ((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1))));
58 #define to_ab8500_fg_device_info(x) container_of((x), \
59 struct ab8500_fg, fg_psy);
62 * struct ab8500_fg_interrupts - ab8500 fg interupts
63 * @name: name of the interrupt
64 * @isr function pointer to the isr
66 struct ab8500_fg_interrupts {
68 irqreturn_t (*isr)(int irq, void *data);
71 enum ab8500_fg_discharge_state {
72 AB8500_FG_DISCHARGE_INIT,
73 AB8500_FG_DISCHARGE_INITMEASURING,
74 AB8500_FG_DISCHARGE_INIT_RECOVERY,
75 AB8500_FG_DISCHARGE_RECOVERY,
76 AB8500_FG_DISCHARGE_READOUT_INIT,
77 AB8500_FG_DISCHARGE_READOUT,
78 AB8500_FG_DISCHARGE_WAKEUP,
81 static char *discharge_state[] = {
83 "DISCHARGE_INITMEASURING",
84 "DISCHARGE_INIT_RECOVERY",
86 "DISCHARGE_READOUT_INIT",
91 enum ab8500_fg_charge_state {
92 AB8500_FG_CHARGE_INIT,
93 AB8500_FG_CHARGE_READOUT,
96 static char *charge_state[] = {
101 enum ab8500_fg_calibration_state {
102 AB8500_FG_CALIB_INIT,
103 AB8500_FG_CALIB_WAIT,
107 struct ab8500_fg_avg_cap {
109 int samples[NBR_AVG_SAMPLES];
110 __kernel_time_t time_stamps[NBR_AVG_SAMPLES];
116 struct ab8500_fg_battery_capacity {
128 struct ab8500_fg_flags {
140 bool batt_id_received;
143 struct inst_curr_result_list {
144 struct list_head list;
149 * struct ab8500_fg - ab8500 FG device information
150 * @dev: Pointer to the structure device
151 * @node: a list of AB8500 FGs, hence prepared for reentrance
152 * @irq holds the CCEOC interrupt number
153 * @vbat: Battery voltage in mV
154 * @vbat_nom: Nominal battery voltage in mV
155 * @inst_curr: Instantenous battery current in mA
156 * @avg_curr: Average battery current in mA
157 * @bat_temp battery temperature
158 * @fg_samples: Number of samples used in the FG accumulation
159 * @accu_charge: Accumulated charge from the last conversion
160 * @recovery_cnt: Counter for recovery mode
161 * @high_curr_cnt: Counter for high current mode
162 * @init_cnt: Counter for init mode
163 * @recovery_needed: Indicate if recovery is needed
164 * @high_curr_mode: Indicate if we're in high current mode
165 * @init_capacity: Indicate if initial capacity measuring should be done
166 * @turn_off_fg: True if fg was off before current measurement
167 * @calib_state State during offset calibration
168 * @discharge_state: Current discharge state
169 * @charge_state: Current charge state
170 * @ab8500_fg_complete Completion struct used for the instant current reading
171 * @flags: Structure for information about events triggered
172 * @bat_cap: Structure for battery capacity specific parameters
173 * @avg_cap: Average capacity filter
174 * @parent: Pointer to the struct ab8500
175 * @gpadc: Pointer to the struct gpadc
176 * @bat: Pointer to the abx500_bm platform data
177 * @fg_psy: Structure that holds the FG specific battery properties
178 * @fg_wq: Work queue for running the FG algorithm
179 * @fg_periodic_work: Work to run the FG algorithm periodically
180 * @fg_low_bat_work: Work to check low bat condition
181 * @fg_reinit_work Work used to reset and reinitialise the FG algorithm
182 * @fg_work: Work to run the FG algorithm instantly
183 * @fg_acc_cur_work: Work to read the FG accumulator
184 * @fg_check_hw_failure_work: Work for checking HW state
185 * @cc_lock: Mutex for locking the CC
186 * @fg_kobject: Structure of type kobject
190 struct list_head node;
202 bool recovery_needed;
206 enum ab8500_fg_calibration_state calib_state;
207 enum ab8500_fg_discharge_state discharge_state;
208 enum ab8500_fg_charge_state charge_state;
209 struct completion ab8500_fg_complete;
210 struct ab8500_fg_flags flags;
211 struct ab8500_fg_battery_capacity bat_cap;
212 struct ab8500_fg_avg_cap avg_cap;
213 struct ab8500 *parent;
214 struct ab8500_gpadc *gpadc;
215 struct abx500_bm_data *bat;
216 struct power_supply fg_psy;
217 struct workqueue_struct *fg_wq;
218 struct delayed_work fg_periodic_work;
219 struct delayed_work fg_low_bat_work;
220 struct delayed_work fg_reinit_work;
221 struct work_struct fg_work;
222 struct work_struct fg_acc_cur_work;
223 struct delayed_work fg_check_hw_failure_work;
224 struct mutex cc_lock;
225 struct kobject fg_kobject;
227 static LIST_HEAD(ab8500_fg_list);
230 * ab8500_fg_get() - returns a reference to the primary AB8500 fuel gauge
231 * (i.e. the first fuel gauge in the instance list)
233 struct ab8500_fg *ab8500_fg_get(void)
235 struct ab8500_fg *fg;
237 if (list_empty(&ab8500_fg_list))
240 fg = list_first_entry(&ab8500_fg_list, struct ab8500_fg, node);
244 /* Main battery properties */
245 static enum power_supply_property ab8500_fg_props[] = {
246 POWER_SUPPLY_PROP_VOLTAGE_NOW,
247 POWER_SUPPLY_PROP_CURRENT_NOW,
248 POWER_SUPPLY_PROP_CURRENT_AVG,
249 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
250 POWER_SUPPLY_PROP_ENERGY_FULL,
251 POWER_SUPPLY_PROP_ENERGY_NOW,
252 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
253 POWER_SUPPLY_PROP_CHARGE_FULL,
254 POWER_SUPPLY_PROP_CHARGE_NOW,
255 POWER_SUPPLY_PROP_CAPACITY,
256 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
260 * This array maps the raw hex value to lowbat voltage used by the AB8500
261 * Values taken from the UM0836
263 static int ab8500_fg_lowbat_voltage_map[] = {
330 static u8 ab8500_volt_to_regval(int voltage)
334 if (voltage < ab8500_fg_lowbat_voltage_map[0])
337 for (i = 0; i < ARRAY_SIZE(ab8500_fg_lowbat_voltage_map); i++) {
338 if (voltage < ab8500_fg_lowbat_voltage_map[i])
342 /* If not captured above, return index of last element */
343 return (u8) ARRAY_SIZE(ab8500_fg_lowbat_voltage_map) - 1;
347 * ab8500_fg_is_low_curr() - Low or high current mode
348 * @di: pointer to the ab8500_fg structure
349 * @curr: the current to base or our decision on
351 * Low current mode if the current consumption is below a certain threshold
353 static int ab8500_fg_is_low_curr(struct ab8500_fg *di, int curr)
356 * We want to know if we're in low current mode
358 if (curr > -di->bat->fg_params->high_curr_threshold)
365 * ab8500_fg_add_cap_sample() - Add capacity to average filter
366 * @di: pointer to the ab8500_fg structure
367 * @sample: the capacity in mAh to add to the filter
369 * A capacity is added to the filter and a new mean capacity is calculated and
372 static int ab8500_fg_add_cap_sample(struct ab8500_fg *di, int sample)
375 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
380 avg->sum += sample - avg->samples[avg->pos];
381 avg->samples[avg->pos] = sample;
382 avg->time_stamps[avg->pos] = ts.tv_sec;
385 if (avg->pos == NBR_AVG_SAMPLES)
388 if (avg->nbr_samples < NBR_AVG_SAMPLES)
392 * Check the time stamp for each sample. If too old,
393 * replace with latest sample
395 } while (ts.tv_sec - VALID_CAPACITY_SEC > avg->time_stamps[avg->pos]);
397 avg->avg = avg->sum / avg->nbr_samples;
403 * ab8500_fg_clear_cap_samples() - Clear average filter
404 * @di: pointer to the ab8500_fg structure
406 * The capacity filter is is reset to zero.
408 static void ab8500_fg_clear_cap_samples(struct ab8500_fg *di)
411 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
414 avg->nbr_samples = 0;
418 for (i = 0; i < NBR_AVG_SAMPLES; i++) {
420 avg->time_stamps[i] = 0;
425 * ab8500_fg_fill_cap_sample() - Fill average filter
426 * @di: pointer to the ab8500_fg structure
427 * @sample: the capacity in mAh to fill the filter with
429 * The capacity filter is filled with a capacity in mAh
431 static void ab8500_fg_fill_cap_sample(struct ab8500_fg *di, int sample)
435 struct ab8500_fg_avg_cap *avg = &di->avg_cap;
439 for (i = 0; i < NBR_AVG_SAMPLES; i++) {
440 avg->samples[i] = sample;
441 avg->time_stamps[i] = ts.tv_sec;
445 avg->nbr_samples = NBR_AVG_SAMPLES;
446 avg->sum = sample * NBR_AVG_SAMPLES;
451 * ab8500_fg_coulomb_counter() - enable coulomb counter
452 * @di: pointer to the ab8500_fg structure
453 * @enable: enable/disable
455 * Enable/Disable coulomb counter.
456 * On failure returns negative value.
458 static int ab8500_fg_coulomb_counter(struct ab8500_fg *di, bool enable)
461 mutex_lock(&di->cc_lock);
463 /* To be able to reprogram the number of samples, we have to
464 * first stop the CC and then enable it again */
465 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
466 AB8500_RTC_CC_CONF_REG, 0x00);
470 /* Program the samples */
471 ret = abx500_set_register_interruptible(di->dev,
472 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
478 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
479 AB8500_RTC_CC_CONF_REG,
480 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
484 di->flags.fg_enabled = true;
486 /* Clear any pending read requests */
487 ret = abx500_set_register_interruptible(di->dev,
488 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0);
492 ret = abx500_set_register_interruptible(di->dev,
493 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU_CTRL, 0);
498 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
499 AB8500_RTC_CC_CONF_REG, 0);
503 di->flags.fg_enabled = false;
506 dev_dbg(di->dev, " CC enabled: %d Samples: %d\n",
507 enable, di->fg_samples);
509 mutex_unlock(&di->cc_lock);
513 dev_err(di->dev, "%s Enabling coulomb counter failed\n", __func__);
514 mutex_unlock(&di->cc_lock);
519 * ab8500_fg_inst_curr_start() - start battery instantaneous current
520 * @di: pointer to the ab8500_fg structure
522 * Returns 0 or error code
523 * Note: This is part "one" and has to be called before
524 * ab8500_fg_inst_curr_finalize()
526 int ab8500_fg_inst_curr_start(struct ab8500_fg *di)
531 mutex_lock(&di->cc_lock);
533 ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
534 AB8500_RTC_CC_CONF_REG, ®_val);
538 if (!(reg_val & CC_PWR_UP_ENA)) {
539 dev_dbg(di->dev, "%s Enable FG\n", __func__);
540 di->turn_off_fg = true;
542 /* Program the samples */
543 ret = abx500_set_register_interruptible(di->dev,
544 AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
550 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
551 AB8500_RTC_CC_CONF_REG,
552 (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
556 di->turn_off_fg = false;
560 INIT_COMPLETION(di->ab8500_fg_complete);
563 /* Note: cc_lock is still locked */
566 mutex_unlock(&di->cc_lock);
571 * ab8500_fg_inst_curr_done() - check if fg conversion is done
572 * @di: pointer to the ab8500_fg structure
574 * Returns 1 if conversion done, 0 if still waiting
576 int ab8500_fg_inst_curr_done(struct ab8500_fg *di)
578 return completion_done(&di->ab8500_fg_complete);
582 * ab8500_fg_inst_curr_finalize() - battery instantaneous current
583 * @di: pointer to the ab8500_fg structure
584 * @res: battery instantenous current(on success)
586 * Returns 0 or an error code
587 * Note: This is part "two" and has to be called at earliest 250 ms
588 * after ab8500_fg_inst_curr_start()
590 int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *res)
597 if (!completion_done(&di->ab8500_fg_complete)) {
598 timeout = wait_for_completion_timeout(&di->ab8500_fg_complete,
600 dev_dbg(di->dev, "Finalize time: %d ms\n",
601 ((INS_CURR_TIMEOUT - timeout) * 1000) / HZ);
604 disable_irq(di->irq);
605 dev_err(di->dev, "completion timed out [%d]\n",
611 disable_irq(di->irq);
613 ret = abx500_mask_and_set_register_interruptible(di->dev,
614 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
617 /* 100uS between read request and read is needed */
618 usleep_range(100, 100);
620 /* Read CC Sample conversion value Low and high */
621 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
622 AB8500_GASG_CC_SMPL_CNVL_REG, &low);
626 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
627 AB8500_GASG_CC_SMPL_CNVH_REG, &high);
632 * negative value for Discharging
633 * convert 2's compliment into decimal
636 val = (low | (high << 8) | 0xFFFFE000);
638 val = (low | (high << 8));
641 * Convert to unit value in mA
642 * Full scale input voltage is
643 * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA
644 * Given a 250ms conversion cycle time the LSB corresponds
645 * to 112.9 nAh. Convert to current by dividing by the conversion
646 * time in hours (250ms = 1 / (3600 * 4)h)
647 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
649 val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) /
650 (1000 * di->bat->fg_res);
652 if (di->turn_off_fg) {
653 dev_dbg(di->dev, "%s Disable FG\n", __func__);
655 /* Clear any pending read requests */
656 ret = abx500_set_register_interruptible(di->dev,
657 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0);
662 ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
663 AB8500_RTC_CC_CONF_REG, 0);
667 mutex_unlock(&di->cc_lock);
672 mutex_unlock(&di->cc_lock);
677 * ab8500_fg_inst_curr_blocking() - battery instantaneous current
678 * @di: pointer to the ab8500_fg structure
679 * @res: battery instantenous current(on success)
681 * Returns 0 else error code
683 int ab8500_fg_inst_curr_blocking(struct ab8500_fg *di)
688 ret = ab8500_fg_inst_curr_start(di);
690 dev_err(di->dev, "Failed to initialize fg_inst\n");
694 ret = ab8500_fg_inst_curr_finalize(di, &res);
696 dev_err(di->dev, "Failed to finalize fg_inst\n");
704 * ab8500_fg_acc_cur_work() - average battery current
705 * @work: pointer to the work_struct structure
707 * Updated the average battery current obtained from the
710 static void ab8500_fg_acc_cur_work(struct work_struct *work)
716 struct ab8500_fg *di = container_of(work,
717 struct ab8500_fg, fg_acc_cur_work);
719 mutex_lock(&di->cc_lock);
720 ret = abx500_set_register_interruptible(di->dev, AB8500_GAS_GAUGE,
721 AB8500_GASG_CC_NCOV_ACCU_CTRL, RD_NCONV_ACCU_REQ);
725 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
726 AB8500_GASG_CC_NCOV_ACCU_LOW, &low);
730 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
731 AB8500_GASG_CC_NCOV_ACCU_MED, &med);
735 ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
736 AB8500_GASG_CC_NCOV_ACCU_HIGH, &high);
740 /* Check for sign bit in case of negative value, 2's compliment */
742 val = (low | (med << 8) | (high << 16) | 0xFFE00000);
744 val = (low | (med << 8) | (high << 16));
748 * Given a 250ms conversion cycle time the LSB corresponds
750 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
752 di->accu_charge = (val * QLSB_NANO_AMP_HOURS_X10) /
753 (100 * di->bat->fg_res);
756 * Convert to unit value in mA
757 * Full scale input voltage is
758 * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA
759 * Given a 250ms conversion cycle time the LSB corresponds
760 * to 112.9 nAh. Convert to current by dividing by the conversion
761 * time in hours (= samples / (3600 * 4)h)
762 * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
764 di->avg_curr = (val * QLSB_NANO_AMP_HOURS_X10 * 36) /
765 (1000 * di->bat->fg_res * (di->fg_samples / 4));
767 di->flags.conv_done = true;
769 mutex_unlock(&di->cc_lock);
771 queue_work(di->fg_wq, &di->fg_work);
776 "Failed to read or write gas gauge registers\n");
777 mutex_unlock(&di->cc_lock);
778 queue_work(di->fg_wq, &di->fg_work);
782 * ab8500_fg_bat_voltage() - get battery voltage
783 * @di: pointer to the ab8500_fg structure
785 * Returns battery voltage(on success) else error code
787 static int ab8500_fg_bat_voltage(struct ab8500_fg *di)
792 vbat = ab8500_gpadc_convert(di->gpadc, MAIN_BAT_V);
795 "%s gpadc conversion failed, using previous value\n",
805 * ab8500_fg_volt_to_capacity() - Voltage based capacity
806 * @di: pointer to the ab8500_fg structure
807 * @voltage: The voltage to convert to a capacity
809 * Returns battery capacity in per mille based on voltage
811 static int ab8500_fg_volt_to_capacity(struct ab8500_fg *di, int voltage)
814 struct abx500_v_to_cap *tbl;
817 tbl = di->bat->bat_type[di->bat->batt_id].v_to_cap_tbl,
818 tbl_size = di->bat->bat_type[di->bat->batt_id].n_v_cap_tbl_elements;
820 for (i = 0; i < tbl_size; ++i) {
821 if (voltage > tbl[i].voltage)
825 if ((i > 0) && (i < tbl_size)) {
826 cap = interpolate(voltage,
828 tbl[i].capacity * 10,
830 tbl[i-1].capacity * 10);
837 dev_dbg(di->dev, "%s Vbat: %d, Cap: %d per mille",
838 __func__, voltage, cap);
844 * ab8500_fg_uncomp_volt_to_capacity() - Uncompensated voltage based capacity
845 * @di: pointer to the ab8500_fg structure
847 * Returns battery capacity based on battery voltage that is not compensated
848 * for the voltage drop due to the load
850 static int ab8500_fg_uncomp_volt_to_capacity(struct ab8500_fg *di)
852 di->vbat = ab8500_fg_bat_voltage(di);
853 return ab8500_fg_volt_to_capacity(di, di->vbat);
857 * ab8500_fg_battery_resistance() - Returns the battery inner resistance
858 * @di: pointer to the ab8500_fg structure
860 * Returns battery inner resistance added with the fuel gauge resistor value
861 * to get the total resistance in the whole link from gnd to bat+ node.
863 static int ab8500_fg_battery_resistance(struct ab8500_fg *di)
866 struct batres_vs_temp *tbl;
869 tbl = di->bat->bat_type[di->bat->batt_id].batres_tbl;
870 tbl_size = di->bat->bat_type[di->bat->batt_id].n_batres_tbl_elements;
872 for (i = 0; i < tbl_size; ++i) {
873 if (di->bat_temp / 10 > tbl[i].temp)
877 if ((i > 0) && (i < tbl_size)) {
878 resist = interpolate(di->bat_temp / 10,
884 resist = tbl[0].resist;
886 resist = tbl[tbl_size - 1].resist;
889 dev_dbg(di->dev, "%s Temp: %d battery internal resistance: %d"
890 " fg resistance %d, total: %d (mOhm)\n",
891 __func__, di->bat_temp, resist, di->bat->fg_res / 10,
892 (di->bat->fg_res / 10) + resist);
894 /* fg_res variable is in 0.1mOhm */
895 resist += di->bat->fg_res / 10;
901 * ab8500_fg_load_comp_volt_to_capacity() - Load compensated voltage based capacity
902 * @di: pointer to the ab8500_fg structure
904 * Returns battery capacity based on battery voltage that is load compensated
905 * for the voltage drop
907 static int ab8500_fg_load_comp_volt_to_capacity(struct ab8500_fg *di)
913 ab8500_fg_inst_curr_start(di);
916 vbat += ab8500_fg_bat_voltage(di);
919 } while (!ab8500_fg_inst_curr_done(di));
921 ab8500_fg_inst_curr_finalize(di, &di->inst_curr);
924 res = ab8500_fg_battery_resistance(di);
926 /* Use Ohms law to get the load compensated voltage */
927 vbat_comp = di->vbat - (di->inst_curr * res) / 1000;
929 dev_dbg(di->dev, "%s Measured Vbat: %dmV,Compensated Vbat %dmV, "
930 "R: %dmOhm, Current: %dmA Vbat Samples: %d\n",
931 __func__, di->vbat, vbat_comp, res, di->inst_curr, i);
933 return ab8500_fg_volt_to_capacity(di, vbat_comp);
937 * ab8500_fg_convert_mah_to_permille() - Capacity in mAh to permille
938 * @di: pointer to the ab8500_fg structure
939 * @cap_mah: capacity in mAh
941 * Converts capacity in mAh to capacity in permille
943 static int ab8500_fg_convert_mah_to_permille(struct ab8500_fg *di, int cap_mah)
945 return (cap_mah * 1000) / di->bat_cap.max_mah_design;
949 * ab8500_fg_convert_permille_to_mah() - Capacity in permille to mAh
950 * @di: pointer to the ab8500_fg structure
951 * @cap_pm: capacity in permille
953 * Converts capacity in permille to capacity in mAh
955 static int ab8500_fg_convert_permille_to_mah(struct ab8500_fg *di, int cap_pm)
957 return cap_pm * di->bat_cap.max_mah_design / 1000;
961 * ab8500_fg_convert_mah_to_uwh() - Capacity in mAh to uWh
962 * @di: pointer to the ab8500_fg structure
963 * @cap_mah: capacity in mAh
965 * Converts capacity in mAh to capacity in uWh
967 static int ab8500_fg_convert_mah_to_uwh(struct ab8500_fg *di, int cap_mah)
972 div_res = ((u64) cap_mah) * ((u64) di->vbat_nom);
973 div_rem = do_div(div_res, 1000);
975 /* Make sure to round upwards if necessary */
976 if (div_rem >= 1000 / 2)
979 return (int) div_res;
983 * ab8500_fg_calc_cap_charging() - Calculate remaining capacity while charging
984 * @di: pointer to the ab8500_fg structure
986 * Return the capacity in mAh based on previous calculated capcity and the FG
987 * accumulator register value. The filter is filled with this capacity
989 static int ab8500_fg_calc_cap_charging(struct ab8500_fg *di)
991 dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
996 /* Capacity should not be less than 0 */
997 if (di->bat_cap.mah + di->accu_charge > 0)
998 di->bat_cap.mah += di->accu_charge;
1000 di->bat_cap.mah = 0;
1002 * We force capacity to 100% once when the algorithm
1003 * reports that it's full.
1005 if (di->bat_cap.mah >= di->bat_cap.max_mah_design ||
1006 di->flags.force_full) {
1007 di->bat_cap.mah = di->bat_cap.max_mah_design;
1010 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1011 di->bat_cap.permille =
1012 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1014 /* We need to update battery voltage and inst current when charging */
1015 di->vbat = ab8500_fg_bat_voltage(di);
1016 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1018 return di->bat_cap.mah;
1022 * ab8500_fg_calc_cap_discharge_voltage() - Capacity in discharge with voltage
1023 * @di: pointer to the ab8500_fg structure
1024 * @comp: if voltage should be load compensated before capacity calc
1026 * Return the capacity in mAh based on the battery voltage. The voltage can
1027 * either be load compensated or not. This value is added to the filter and a
1028 * new mean value is calculated and returned.
1030 static int ab8500_fg_calc_cap_discharge_voltage(struct ab8500_fg *di, bool comp)
1035 permille = ab8500_fg_load_comp_volt_to_capacity(di);
1037 permille = ab8500_fg_uncomp_volt_to_capacity(di);
1039 mah = ab8500_fg_convert_permille_to_mah(di, permille);
1041 di->bat_cap.mah = ab8500_fg_add_cap_sample(di, mah);
1042 di->bat_cap.permille =
1043 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1045 return di->bat_cap.mah;
1049 * ab8500_fg_calc_cap_discharge_fg() - Capacity in discharge with FG
1050 * @di: pointer to the ab8500_fg structure
1052 * Return the capacity in mAh based on previous calculated capcity and the FG
1053 * accumulator register value. This value is added to the filter and a
1054 * new mean value is calculated and returned.
1056 static int ab8500_fg_calc_cap_discharge_fg(struct ab8500_fg *di)
1058 int permille_volt, permille;
1060 dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
1065 /* Capacity should not be less than 0 */
1066 if (di->bat_cap.mah + di->accu_charge > 0)
1067 di->bat_cap.mah += di->accu_charge;
1069 di->bat_cap.mah = 0;
1071 if (di->bat_cap.mah >= di->bat_cap.max_mah_design)
1072 di->bat_cap.mah = di->bat_cap.max_mah_design;
1075 * Check against voltage based capacity. It can not be lower
1076 * than what the uncompensated voltage says
1078 permille = ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1079 permille_volt = ab8500_fg_uncomp_volt_to_capacity(di);
1081 if (permille < permille_volt) {
1082 di->bat_cap.permille = permille_volt;
1083 di->bat_cap.mah = ab8500_fg_convert_permille_to_mah(di,
1084 di->bat_cap.permille);
1086 dev_dbg(di->dev, "%s voltage based: perm %d perm_volt %d\n",
1091 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1093 ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
1094 di->bat_cap.permille =
1095 ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
1098 return di->bat_cap.mah;
1102 * ab8500_fg_capacity_level() - Get the battery capacity level
1103 * @di: pointer to the ab8500_fg structure
1105 * Get the battery capacity level based on the capacity in percent
1107 static int ab8500_fg_capacity_level(struct ab8500_fg *di)
1111 percent = di->bat_cap.permille / 10;
1113 if (percent <= di->bat->cap_levels->critical ||
1115 ret = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1116 else if (percent <= di->bat->cap_levels->low)
1117 ret = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1118 else if (percent <= di->bat->cap_levels->normal)
1119 ret = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1120 else if (percent <= di->bat->cap_levels->high)
1121 ret = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
1123 ret = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1129 * ab8500_fg_check_capacity_limits() - Check if capacity has changed
1130 * @di: pointer to the ab8500_fg structure
1131 * @init: capacity is allowed to go up in init mode
1133 * Check if capacity or capacity limit has changed and notify the system
1134 * about it using the power_supply framework
1136 static void ab8500_fg_check_capacity_limits(struct ab8500_fg *di, bool init)
1138 bool changed = false;
1140 di->bat_cap.level = ab8500_fg_capacity_level(di);
1142 if (di->bat_cap.level != di->bat_cap.prev_level) {
1144 * We do not allow reported capacity level to go up
1145 * unless we're charging or if we're in init
1147 if (!(!di->flags.charging && di->bat_cap.level >
1148 di->bat_cap.prev_level) || init) {
1149 dev_dbg(di->dev, "level changed from %d to %d\n",
1150 di->bat_cap.prev_level,
1152 di->bat_cap.prev_level = di->bat_cap.level;
1155 dev_dbg(di->dev, "level not allowed to go up "
1156 "since no charger is connected: %d to %d\n",
1157 di->bat_cap.prev_level,
1163 * If we have received the LOW_BAT IRQ, set capacity to 0 to initiate
1166 if (di->flags.low_bat) {
1167 dev_dbg(di->dev, "Battery low, set capacity to 0\n");
1168 di->bat_cap.prev_percent = 0;
1169 di->bat_cap.permille = 0;
1170 di->bat_cap.prev_mah = 0;
1171 di->bat_cap.mah = 0;
1173 } else if (di->flags.fully_charged) {
1175 * We report 100% if algorithm reported fully charged
1176 * unless capacity drops too much
1178 if (di->flags.force_full) {
1179 di->bat_cap.prev_percent = di->bat_cap.permille / 10;
1180 di->bat_cap.prev_mah = di->bat_cap.mah;
1181 } else if (!di->flags.force_full &&
1182 di->bat_cap.prev_percent !=
1183 (di->bat_cap.permille) / 10 &&
1184 (di->bat_cap.permille / 10) <
1185 di->bat->fg_params->maint_thres) {
1187 "battery reported full "
1188 "but capacity dropping: %d\n",
1189 di->bat_cap.permille / 10);
1190 di->bat_cap.prev_percent = di->bat_cap.permille / 10;
1191 di->bat_cap.prev_mah = di->bat_cap.mah;
1195 } else if (di->bat_cap.prev_percent != di->bat_cap.permille / 10) {
1196 if (di->bat_cap.permille / 10 == 0) {
1198 * We will not report 0% unless we've got
1199 * the LOW_BAT IRQ, no matter what the FG
1202 di->bat_cap.prev_percent = 1;
1203 di->bat_cap.permille = 1;
1204 di->bat_cap.prev_mah = 1;
1205 di->bat_cap.mah = 1;
1208 } else if (!(!di->flags.charging &&
1209 (di->bat_cap.permille / 10) >
1210 di->bat_cap.prev_percent) || init) {
1212 * We do not allow reported capacity to go up
1213 * unless we're charging or if we're in init
1216 "capacity changed from %d to %d (%d)\n",
1217 di->bat_cap.prev_percent,
1218 di->bat_cap.permille / 10,
1219 di->bat_cap.permille);
1220 di->bat_cap.prev_percent = di->bat_cap.permille / 10;
1221 di->bat_cap.prev_mah = di->bat_cap.mah;
1225 dev_dbg(di->dev, "capacity not allowed to go up since "
1226 "no charger is connected: %d to %d (%d)\n",
1227 di->bat_cap.prev_percent,
1228 di->bat_cap.permille / 10,
1229 di->bat_cap.permille);
1234 power_supply_changed(&di->fg_psy);
1235 if (di->flags.fully_charged && di->flags.force_full) {
1236 dev_dbg(di->dev, "Battery full, notifying.\n");
1237 di->flags.force_full = false;
1238 sysfs_notify(&di->fg_kobject, NULL, "charge_full");
1240 sysfs_notify(&di->fg_kobject, NULL, "charge_now");
1244 static void ab8500_fg_charge_state_to(struct ab8500_fg *di,
1245 enum ab8500_fg_charge_state new_state)
1247 dev_dbg(di->dev, "Charge state from %d [%s] to %d [%s]\n",
1249 charge_state[di->charge_state],
1251 charge_state[new_state]);
1253 di->charge_state = new_state;
1256 static void ab8500_fg_discharge_state_to(struct ab8500_fg *di,
1257 enum ab8500_fg_discharge_state new_state)
1259 dev_dbg(di->dev, "Disharge state from %d [%s] to %d [%s]\n",
1260 di->discharge_state,
1261 discharge_state[di->discharge_state],
1263 discharge_state[new_state]);
1265 di->discharge_state = new_state;
1269 * ab8500_fg_algorithm_charging() - FG algorithm for when charging
1270 * @di: pointer to the ab8500_fg structure
1272 * Battery capacity calculation state machine for when we're charging
1274 static void ab8500_fg_algorithm_charging(struct ab8500_fg *di)
1277 * If we change to discharge mode
1278 * we should start with recovery
1280 if (di->discharge_state != AB8500_FG_DISCHARGE_INIT_RECOVERY)
1281 ab8500_fg_discharge_state_to(di,
1282 AB8500_FG_DISCHARGE_INIT_RECOVERY);
1284 switch (di->charge_state) {
1285 case AB8500_FG_CHARGE_INIT:
1286 di->fg_samples = SEC_TO_SAMPLE(
1287 di->bat->fg_params->accu_charging);
1289 ab8500_fg_coulomb_counter(di, true);
1290 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_READOUT);
1294 case AB8500_FG_CHARGE_READOUT:
1296 * Read the FG and calculate the new capacity
1298 mutex_lock(&di->cc_lock);
1299 if (!di->flags.conv_done) {
1300 /* Wasn't the CC IRQ that got us here */
1301 mutex_unlock(&di->cc_lock);
1302 dev_dbg(di->dev, "%s CC conv not done\n",
1307 di->flags.conv_done = false;
1308 mutex_unlock(&di->cc_lock);
1310 ab8500_fg_calc_cap_charging(di);
1318 /* Check capacity limits */
1319 ab8500_fg_check_capacity_limits(di, false);
1322 static void force_capacity(struct ab8500_fg *di)
1326 ab8500_fg_clear_cap_samples(di);
1327 cap = di->bat_cap.user_mah;
1328 if (cap > di->bat_cap.max_mah_design) {
1329 dev_dbg(di->dev, "Remaining cap %d can't be bigger than total"
1330 " %d\n", cap, di->bat_cap.max_mah_design);
1331 cap = di->bat_cap.max_mah_design;
1333 ab8500_fg_fill_cap_sample(di, di->bat_cap.user_mah);
1334 di->bat_cap.permille = ab8500_fg_convert_mah_to_permille(di, cap);
1335 di->bat_cap.mah = cap;
1336 ab8500_fg_check_capacity_limits(di, true);
1339 static bool check_sysfs_capacity(struct ab8500_fg *di)
1341 int cap, lower, upper;
1344 cap = di->bat_cap.user_mah;
1346 cap_permille = ab8500_fg_convert_mah_to_permille(di,
1347 di->bat_cap.user_mah);
1349 lower = di->bat_cap.permille - di->bat->fg_params->user_cap_limit * 10;
1350 upper = di->bat_cap.permille + di->bat->fg_params->user_cap_limit * 10;
1354 /* 1000 is permille, -> 100 percent */
1358 dev_dbg(di->dev, "Capacity limits:"
1359 " (Lower: %d User: %d Upper: %d) [user: %d, was: %d]\n",
1360 lower, cap_permille, upper, cap, di->bat_cap.mah);
1362 /* If within limits, use the saved capacity and exit estimation...*/
1363 if (cap_permille > lower && cap_permille < upper) {
1364 dev_dbg(di->dev, "OK! Using users cap %d uAh now\n", cap);
1368 dev_dbg(di->dev, "Capacity from user out of limits, ignoring");
1373 * ab8500_fg_algorithm_discharging() - FG algorithm for when discharging
1374 * @di: pointer to the ab8500_fg structure
1376 * Battery capacity calculation state machine for when we're discharging
1378 static void ab8500_fg_algorithm_discharging(struct ab8500_fg *di)
1382 /* If we change to charge mode we should start with init */
1383 if (di->charge_state != AB8500_FG_CHARGE_INIT)
1384 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
1386 switch (di->discharge_state) {
1387 case AB8500_FG_DISCHARGE_INIT:
1388 /* We use the FG IRQ to work on */
1390 di->fg_samples = SEC_TO_SAMPLE(di->bat->fg_params->init_timer);
1391 ab8500_fg_coulomb_counter(di, true);
1392 ab8500_fg_discharge_state_to(di,
1393 AB8500_FG_DISCHARGE_INITMEASURING);
1395 /* Intentional fallthrough */
1396 case AB8500_FG_DISCHARGE_INITMEASURING:
1398 * Discard a number of samples during startup.
1399 * After that, use compensated voltage for a few
1400 * samples to get an initial capacity.
1401 * Then go to READOUT
1403 sleep_time = di->bat->fg_params->init_timer;
1405 /* Discard the first [x] seconds */
1407 di->bat->fg_params->init_discard_time) {
1408 ab8500_fg_calc_cap_discharge_voltage(di, true);
1410 ab8500_fg_check_capacity_limits(di, true);
1413 di->init_cnt += sleep_time;
1414 if (di->init_cnt > di->bat->fg_params->init_total_time)
1415 ab8500_fg_discharge_state_to(di,
1416 AB8500_FG_DISCHARGE_READOUT_INIT);
1420 case AB8500_FG_DISCHARGE_INIT_RECOVERY:
1421 di->recovery_cnt = 0;
1422 di->recovery_needed = true;
1423 ab8500_fg_discharge_state_to(di,
1424 AB8500_FG_DISCHARGE_RECOVERY);
1426 /* Intentional fallthrough */
1428 case AB8500_FG_DISCHARGE_RECOVERY:
1429 sleep_time = di->bat->fg_params->recovery_sleep_timer;
1432 * We should check the power consumption
1433 * If low, go to READOUT (after x min) or
1434 * RECOVERY_SLEEP if time left.
1435 * If high, go to READOUT
1437 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1439 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1440 if (di->recovery_cnt >
1441 di->bat->fg_params->recovery_total_time) {
1442 di->fg_samples = SEC_TO_SAMPLE(
1443 di->bat->fg_params->accu_high_curr);
1444 ab8500_fg_coulomb_counter(di, true);
1445 ab8500_fg_discharge_state_to(di,
1446 AB8500_FG_DISCHARGE_READOUT);
1447 di->recovery_needed = false;
1449 queue_delayed_work(di->fg_wq,
1450 &di->fg_periodic_work,
1453 di->recovery_cnt += sleep_time;
1455 di->fg_samples = SEC_TO_SAMPLE(
1456 di->bat->fg_params->accu_high_curr);
1457 ab8500_fg_coulomb_counter(di, true);
1458 ab8500_fg_discharge_state_to(di,
1459 AB8500_FG_DISCHARGE_READOUT);
1463 case AB8500_FG_DISCHARGE_READOUT_INIT:
1464 di->fg_samples = SEC_TO_SAMPLE(
1465 di->bat->fg_params->accu_high_curr);
1466 ab8500_fg_coulomb_counter(di, true);
1467 ab8500_fg_discharge_state_to(di,
1468 AB8500_FG_DISCHARGE_READOUT);
1471 case AB8500_FG_DISCHARGE_READOUT:
1472 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1474 if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
1475 /* Detect mode change */
1476 if (di->high_curr_mode) {
1477 di->high_curr_mode = false;
1478 di->high_curr_cnt = 0;
1481 if (di->recovery_needed) {
1482 ab8500_fg_discharge_state_to(di,
1483 AB8500_FG_DISCHARGE_RECOVERY);
1485 queue_delayed_work(di->fg_wq,
1486 &di->fg_periodic_work, 0);
1491 ab8500_fg_calc_cap_discharge_voltage(di, true);
1493 mutex_lock(&di->cc_lock);
1494 if (!di->flags.conv_done) {
1495 /* Wasn't the CC IRQ that got us here */
1496 mutex_unlock(&di->cc_lock);
1497 dev_dbg(di->dev, "%s CC conv not done\n",
1502 di->flags.conv_done = false;
1503 mutex_unlock(&di->cc_lock);
1505 /* Detect mode change */
1506 if (!di->high_curr_mode) {
1507 di->high_curr_mode = true;
1508 di->high_curr_cnt = 0;
1511 di->high_curr_cnt +=
1512 di->bat->fg_params->accu_high_curr;
1513 if (di->high_curr_cnt >
1514 di->bat->fg_params->high_curr_time)
1515 di->recovery_needed = true;
1517 ab8500_fg_calc_cap_discharge_fg(di);
1520 ab8500_fg_check_capacity_limits(di, false);
1524 case AB8500_FG_DISCHARGE_WAKEUP:
1525 ab8500_fg_coulomb_counter(di, true);
1526 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1528 ab8500_fg_calc_cap_discharge_voltage(di, true);
1530 di->fg_samples = SEC_TO_SAMPLE(
1531 di->bat->fg_params->accu_high_curr);
1532 ab8500_fg_coulomb_counter(di, true);
1533 ab8500_fg_discharge_state_to(di,
1534 AB8500_FG_DISCHARGE_READOUT);
1536 ab8500_fg_check_capacity_limits(di, false);
1546 * ab8500_fg_algorithm_calibrate() - Internal columb counter offset calibration
1547 * @di: pointer to the ab8500_fg structure
1550 static void ab8500_fg_algorithm_calibrate(struct ab8500_fg *di)
1554 switch (di->calib_state) {
1555 case AB8500_FG_CALIB_INIT:
1556 dev_dbg(di->dev, "Calibration ongoing...\n");
1558 ret = abx500_mask_and_set_register_interruptible(di->dev,
1559 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1560 CC_INT_CAL_N_AVG_MASK, CC_INT_CAL_SAMPLES_8);
1564 ret = abx500_mask_and_set_register_interruptible(di->dev,
1565 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1566 CC_INTAVGOFFSET_ENA, CC_INTAVGOFFSET_ENA);
1569 di->calib_state = AB8500_FG_CALIB_WAIT;
1571 case AB8500_FG_CALIB_END:
1572 ret = abx500_mask_and_set_register_interruptible(di->dev,
1573 AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
1574 CC_MUXOFFSET, CC_MUXOFFSET);
1577 di->flags.calibrate = false;
1578 dev_dbg(di->dev, "Calibration done...\n");
1579 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1581 case AB8500_FG_CALIB_WAIT:
1582 dev_dbg(di->dev, "Calibration WFI\n");
1588 /* Something went wrong, don't calibrate then */
1589 dev_err(di->dev, "failed to calibrate the CC\n");
1590 di->flags.calibrate = false;
1591 di->calib_state = AB8500_FG_CALIB_INIT;
1592 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1596 * ab8500_fg_algorithm() - Entry point for the FG algorithm
1597 * @di: pointer to the ab8500_fg structure
1599 * Entry point for the battery capacity calculation state machine
1601 static void ab8500_fg_algorithm(struct ab8500_fg *di)
1603 if (di->flags.calibrate)
1604 ab8500_fg_algorithm_calibrate(di);
1606 if (di->flags.charging)
1607 ab8500_fg_algorithm_charging(di);
1609 ab8500_fg_algorithm_discharging(di);
1612 dev_dbg(di->dev, "[FG_DATA] %d %d %d %d %d %d %d %d %d "
1613 "%d %d %d %d %d %d %d\n",
1614 di->bat_cap.max_mah_design,
1616 di->bat_cap.permille,
1618 di->bat_cap.prev_mah,
1619 di->bat_cap.prev_percent,
1620 di->bat_cap.prev_level,
1627 di->discharge_state,
1629 di->recovery_needed);
1633 * ab8500_fg_periodic_work() - Run the FG state machine periodically
1634 * @work: pointer to the work_struct structure
1636 * Work queue function for periodic work
1638 static void ab8500_fg_periodic_work(struct work_struct *work)
1640 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1641 fg_periodic_work.work);
1643 if (di->init_capacity) {
1644 /* A dummy read that will return 0 */
1645 di->inst_curr = ab8500_fg_inst_curr_blocking(di);
1646 /* Get an initial capacity calculation */
1647 ab8500_fg_calc_cap_discharge_voltage(di, true);
1648 ab8500_fg_check_capacity_limits(di, true);
1649 di->init_capacity = false;
1651 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1652 } else if (di->flags.user_cap) {
1653 if (check_sysfs_capacity(di)) {
1654 ab8500_fg_check_capacity_limits(di, true);
1655 if (di->flags.charging)
1656 ab8500_fg_charge_state_to(di,
1657 AB8500_FG_CHARGE_INIT);
1659 ab8500_fg_discharge_state_to(di,
1660 AB8500_FG_DISCHARGE_READOUT_INIT);
1662 di->flags.user_cap = false;
1663 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1665 ab8500_fg_algorithm(di);
1670 * ab8500_fg_check_hw_failure_work() - Check OVV_BAT condition
1671 * @work: pointer to the work_struct structure
1673 * Work queue function for checking the OVV_BAT condition
1675 static void ab8500_fg_check_hw_failure_work(struct work_struct *work)
1680 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1681 fg_check_hw_failure_work.work);
1684 * If we have had a battery over-voltage situation,
1685 * check ovv-bit to see if it should be reset.
1687 if (di->flags.bat_ovv) {
1688 ret = abx500_get_register_interruptible(di->dev,
1689 AB8500_CHARGER, AB8500_CH_STAT_REG,
1692 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1695 if ((reg_value & BATT_OVV) != BATT_OVV) {
1696 dev_dbg(di->dev, "Battery recovered from OVV\n");
1697 di->flags.bat_ovv = false;
1698 power_supply_changed(&di->fg_psy);
1702 /* Not yet recovered from ovv, reschedule this test */
1703 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work,
1709 * ab8500_fg_low_bat_work() - Check LOW_BAT condition
1710 * @work: pointer to the work_struct structure
1712 * Work queue function for checking the LOW_BAT condition
1714 static void ab8500_fg_low_bat_work(struct work_struct *work)
1718 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
1719 fg_low_bat_work.work);
1721 vbat = ab8500_fg_bat_voltage(di);
1723 /* Check if LOW_BAT still fulfilled */
1724 if (vbat < di->bat->fg_params->lowbat_threshold) {
1725 di->flags.low_bat = true;
1726 dev_warn(di->dev, "Battery voltage still LOW\n");
1729 * We need to re-schedule this check to be able to detect
1730 * if the voltage increases again during charging
1732 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
1733 round_jiffies(LOW_BAT_CHECK_INTERVAL));
1735 di->flags.low_bat = false;
1736 dev_warn(di->dev, "Battery voltage OK again\n");
1739 /* This is needed to dispatch LOW_BAT */
1740 ab8500_fg_check_capacity_limits(di, false);
1742 /* Set this flag to check if LOW_BAT IRQ still occurs */
1743 di->flags.low_bat_delay = false;
1747 * ab8500_fg_battok_calc - calculate the bit pattern corresponding
1748 * to the target voltage.
1749 * @di: pointer to the ab8500_fg structure
1750 * @target target voltage
1752 * Returns bit pattern closest to the target voltage
1753 * valid return values are 0-14. (0-BATT_OK_MAX_NR_INCREMENTS)
1756 static int ab8500_fg_battok_calc(struct ab8500_fg *di, int target)
1758 if (target > BATT_OK_MIN +
1759 (BATT_OK_INCREMENT * BATT_OK_MAX_NR_INCREMENTS))
1760 return BATT_OK_MAX_NR_INCREMENTS;
1761 if (target < BATT_OK_MIN)
1763 return (target - BATT_OK_MIN) / BATT_OK_INCREMENT;
1767 * ab8500_fg_battok_init_hw_register - init battok levels
1768 * @di: pointer to the ab8500_fg structure
1772 static int ab8500_fg_battok_init_hw_register(struct ab8500_fg *di)
1782 sel0 = di->bat->fg_params->battok_falling_th_sel0;
1783 sel1 = di->bat->fg_params->battok_raising_th_sel1;
1785 cbp_sel0 = ab8500_fg_battok_calc(di, sel0);
1786 cbp_sel1 = ab8500_fg_battok_calc(di, sel1);
1788 selected = BATT_OK_MIN + cbp_sel0 * BATT_OK_INCREMENT;
1790 if (selected != sel0)
1791 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1792 sel0, selected, cbp_sel0);
1794 selected = BATT_OK_MIN + cbp_sel1 * BATT_OK_INCREMENT;
1796 if (selected != sel1)
1797 dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
1798 sel1, selected, cbp_sel1);
1800 new_val = cbp_sel0 | (cbp_sel1 << 4);
1802 dev_dbg(di->dev, "using: %x %d %d\n", new_val, cbp_sel0, cbp_sel1);
1803 ret = abx500_set_register_interruptible(di->dev, AB8500_SYS_CTRL2_BLOCK,
1804 AB8500_BATT_OK_REG, new_val);
1809 * ab8500_fg_instant_work() - Run the FG state machine instantly
1810 * @work: pointer to the work_struct structure
1812 * Work queue function for instant work
1814 static void ab8500_fg_instant_work(struct work_struct *work)
1816 struct ab8500_fg *di = container_of(work, struct ab8500_fg, fg_work);
1818 ab8500_fg_algorithm(di);
1822 * ab8500_fg_cc_data_end_handler() - isr to get battery avg current.
1823 * @irq: interrupt number
1824 * @_di: pointer to the ab8500_fg structure
1826 * Returns IRQ status(IRQ_HANDLED)
1828 static irqreturn_t ab8500_fg_cc_data_end_handler(int irq, void *_di)
1830 struct ab8500_fg *di = _di;
1831 complete(&di->ab8500_fg_complete);
1836 * ab8500_fg_cc_convend_handler() - isr to get battery avg current.
1837 * @irq: interrupt number
1838 * @_di: pointer to the ab8500_fg structure
1840 * Returns IRQ status(IRQ_HANDLED)
1842 static irqreturn_t ab8500_fg_cc_int_calib_handler(int irq, void *_di)
1844 struct ab8500_fg *di = _di;
1845 di->calib_state = AB8500_FG_CALIB_END;
1846 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
1851 * ab8500_fg_cc_convend_handler() - isr to get battery avg current.
1852 * @irq: interrupt number
1853 * @_di: pointer to the ab8500_fg structure
1855 * Returns IRQ status(IRQ_HANDLED)
1857 static irqreturn_t ab8500_fg_cc_convend_handler(int irq, void *_di)
1859 struct ab8500_fg *di = _di;
1861 queue_work(di->fg_wq, &di->fg_acc_cur_work);
1867 * ab8500_fg_batt_ovv_handler() - Battery OVV occured
1868 * @irq: interrupt number
1869 * @_di: pointer to the ab8500_fg structure
1871 * Returns IRQ status(IRQ_HANDLED)
1873 static irqreturn_t ab8500_fg_batt_ovv_handler(int irq, void *_di)
1875 struct ab8500_fg *di = _di;
1877 dev_dbg(di->dev, "Battery OVV\n");
1878 di->flags.bat_ovv = true;
1879 power_supply_changed(&di->fg_psy);
1881 /* Schedule a new HW failure check */
1882 queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, 0);
1888 * ab8500_fg_lowbatf_handler() - Battery voltage is below LOW threshold
1889 * @irq: interrupt number
1890 * @_di: pointer to the ab8500_fg structure
1892 * Returns IRQ status(IRQ_HANDLED)
1894 static irqreturn_t ab8500_fg_lowbatf_handler(int irq, void *_di)
1896 struct ab8500_fg *di = _di;
1898 if (!di->flags.low_bat_delay) {
1899 dev_warn(di->dev, "Battery voltage is below LOW threshold\n");
1900 di->flags.low_bat_delay = true;
1902 * Start a timer to check LOW_BAT again after some time
1903 * This is done to avoid shutdown on single voltage dips
1905 queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
1906 round_jiffies(LOW_BAT_CHECK_INTERVAL));
1912 * ab8500_fg_get_property() - get the fg properties
1913 * @psy: pointer to the power_supply structure
1914 * @psp: pointer to the power_supply_property structure
1915 * @val: pointer to the power_supply_propval union
1917 * This function gets called when an application tries to get the
1918 * fg properties by reading the sysfs files.
1919 * voltage_now: battery voltage
1920 * current_now: battery instant current
1921 * current_avg: battery average current
1922 * charge_full_design: capacity where battery is considered full
1923 * charge_now: battery capacity in nAh
1924 * capacity: capacity in percent
1925 * capacity_level: capacity level
1927 * Returns error code in case of failure else 0 on success
1929 static int ab8500_fg_get_property(struct power_supply *psy,
1930 enum power_supply_property psp,
1931 union power_supply_propval *val)
1933 struct ab8500_fg *di;
1935 di = to_ab8500_fg_device_info(psy);
1938 * If battery is identified as unknown and charging of unknown
1939 * batteries is disabled, we always report 100% capacity and
1940 * capacity level UNKNOWN, since we can't calculate
1941 * remaining capacity
1945 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1946 if (di->flags.bat_ovv)
1947 val->intval = BATT_OVV_VALUE * 1000;
1949 val->intval = di->vbat * 1000;
1951 case POWER_SUPPLY_PROP_CURRENT_NOW:
1952 val->intval = di->inst_curr * 1000;
1954 case POWER_SUPPLY_PROP_CURRENT_AVG:
1955 val->intval = di->avg_curr * 1000;
1957 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
1958 val->intval = ab8500_fg_convert_mah_to_uwh(di,
1959 di->bat_cap.max_mah_design);
1961 case POWER_SUPPLY_PROP_ENERGY_FULL:
1962 val->intval = ab8500_fg_convert_mah_to_uwh(di,
1963 di->bat_cap.max_mah);
1965 case POWER_SUPPLY_PROP_ENERGY_NOW:
1966 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1967 di->flags.batt_id_received)
1968 val->intval = ab8500_fg_convert_mah_to_uwh(di,
1969 di->bat_cap.max_mah);
1971 val->intval = ab8500_fg_convert_mah_to_uwh(di,
1972 di->bat_cap.prev_mah);
1974 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1975 val->intval = di->bat_cap.max_mah_design;
1977 case POWER_SUPPLY_PROP_CHARGE_FULL:
1978 val->intval = di->bat_cap.max_mah;
1980 case POWER_SUPPLY_PROP_CHARGE_NOW:
1981 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1982 di->flags.batt_id_received)
1983 val->intval = di->bat_cap.max_mah;
1985 val->intval = di->bat_cap.prev_mah;
1987 case POWER_SUPPLY_PROP_CAPACITY:
1988 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1989 di->flags.batt_id_received)
1992 val->intval = di->bat_cap.prev_percent;
1994 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
1995 if (di->flags.batt_unknown && !di->bat->chg_unknown_bat &&
1996 di->flags.batt_id_received)
1997 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
1999 val->intval = di->bat_cap.prev_level;
2007 static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data)
2009 struct power_supply *psy;
2010 struct power_supply *ext;
2011 struct ab8500_fg *di;
2012 union power_supply_propval ret;
2014 bool psy_found = false;
2016 psy = (struct power_supply *)data;
2017 ext = dev_get_drvdata(dev);
2018 di = to_ab8500_fg_device_info(psy);
2021 * For all psy where the name of your driver
2022 * appears in any supplied_to
2024 for (i = 0; i < ext->num_supplicants; i++) {
2025 if (!strcmp(ext->supplied_to[i], psy->name))
2032 /* Go through all properties for the psy */
2033 for (j = 0; j < ext->num_properties; j++) {
2034 enum power_supply_property prop;
2035 prop = ext->properties[j];
2037 if (ext->get_property(ext, prop, &ret))
2041 case POWER_SUPPLY_PROP_STATUS:
2042 switch (ext->type) {
2043 case POWER_SUPPLY_TYPE_BATTERY:
2044 switch (ret.intval) {
2045 case POWER_SUPPLY_STATUS_UNKNOWN:
2046 case POWER_SUPPLY_STATUS_DISCHARGING:
2047 case POWER_SUPPLY_STATUS_NOT_CHARGING:
2048 if (!di->flags.charging)
2050 di->flags.charging = false;
2051 di->flags.fully_charged = false;
2052 queue_work(di->fg_wq, &di->fg_work);
2054 case POWER_SUPPLY_STATUS_FULL:
2055 if (di->flags.fully_charged)
2057 di->flags.fully_charged = true;
2058 di->flags.force_full = true;
2059 /* Save current capacity as maximum */
2060 di->bat_cap.max_mah = di->bat_cap.mah;
2061 queue_work(di->fg_wq, &di->fg_work);
2063 case POWER_SUPPLY_STATUS_CHARGING:
2064 if (di->flags.charging)
2066 di->flags.charging = true;
2067 di->flags.fully_charged = false;
2068 queue_work(di->fg_wq, &di->fg_work);
2075 case POWER_SUPPLY_PROP_TECHNOLOGY:
2076 switch (ext->type) {
2077 case POWER_SUPPLY_TYPE_BATTERY:
2078 if (!di->flags.batt_id_received) {
2079 const struct abx500_battery_type *b;
2081 b = &(di->bat->bat_type[di->bat->batt_id]);
2083 di->flags.batt_id_received = true;
2085 di->bat_cap.max_mah_design =
2087 b->charge_full_design;
2089 di->bat_cap.max_mah =
2090 di->bat_cap.max_mah_design;
2092 di->vbat_nom = b->nominal_voltage;
2096 di->flags.batt_unknown = false;
2098 di->flags.batt_unknown = true;
2104 case POWER_SUPPLY_PROP_TEMP:
2105 switch (ext->type) {
2106 case POWER_SUPPLY_TYPE_BATTERY:
2107 if (di->flags.batt_id_received)
2108 di->bat_temp = ret.intval;
2122 * ab8500_fg_init_hw_registers() - Set up FG related registers
2123 * @di: pointer to the ab8500_fg structure
2125 * Set up battery OVV, low battery voltage registers
2127 static int ab8500_fg_init_hw_registers(struct ab8500_fg *di)
2131 /* Set VBAT OVV threshold */
2132 ret = abx500_mask_and_set_register_interruptible(di->dev,
2138 dev_err(di->dev, "failed to set BATT_OVV\n");
2142 /* Enable VBAT OVV detection */
2143 ret = abx500_mask_and_set_register_interruptible(di->dev,
2149 dev_err(di->dev, "failed to enable BATT_OVV\n");
2153 /* Low Battery Voltage */
2154 ret = abx500_set_register_interruptible(di->dev,
2155 AB8500_SYS_CTRL2_BLOCK,
2157 ab8500_volt_to_regval(
2158 di->bat->fg_params->lowbat_threshold) << 1 |
2161 dev_err(di->dev, "%s write failed\n", __func__);
2165 /* Battery OK threshold */
2166 ret = ab8500_fg_battok_init_hw_register(di);
2168 dev_err(di->dev, "BattOk init write failed.\n");
2176 * ab8500_fg_external_power_changed() - callback for power supply changes
2177 * @psy: pointer to the structure power_supply
2179 * This function is the entry point of the pointer external_power_changed
2180 * of the structure power_supply.
2181 * This function gets executed when there is a change in any external power
2182 * supply that this driver needs to be notified of.
2184 static void ab8500_fg_external_power_changed(struct power_supply *psy)
2186 struct ab8500_fg *di = to_ab8500_fg_device_info(psy);
2188 class_for_each_device(power_supply_class, NULL,
2189 &di->fg_psy, ab8500_fg_get_ext_psy_data);
2193 * abab8500_fg_reinit_work() - work to reset the FG algorithm
2194 * @work: pointer to the work_struct structure
2196 * Used to reset the current battery capacity to be able to
2197 * retrigger a new voltage base capacity calculation. For
2198 * test and verification purpose.
2200 static void ab8500_fg_reinit_work(struct work_struct *work)
2202 struct ab8500_fg *di = container_of(work, struct ab8500_fg,
2203 fg_reinit_work.work);
2205 if (di->flags.calibrate == false) {
2206 dev_dbg(di->dev, "Resetting FG state machine to init.\n");
2207 ab8500_fg_clear_cap_samples(di);
2208 ab8500_fg_calc_cap_discharge_voltage(di, true);
2209 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
2210 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
2211 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2214 dev_err(di->dev, "Residual offset calibration ongoing "
2216 /* Wait one second until next try*/
2217 queue_delayed_work(di->fg_wq, &di->fg_reinit_work,
2223 * ab8500_fg_reinit() - forces FG algorithm to reinitialize with current values
2225 * This function can be used to force the FG algorithm to recalculate a new
2226 * voltage based battery capacity.
2228 void ab8500_fg_reinit(void)
2230 struct ab8500_fg *di = ab8500_fg_get();
2231 /* User won't be notified if a null pointer returned. */
2233 queue_delayed_work(di->fg_wq, &di->fg_reinit_work, 0);
2236 /* Exposure to the sysfs interface */
2238 struct ab8500_fg_sysfs_entry {
2239 struct attribute attr;
2240 ssize_t (*show)(struct ab8500_fg *, char *);
2241 ssize_t (*store)(struct ab8500_fg *, const char *, size_t);
2244 static ssize_t charge_full_show(struct ab8500_fg *di, char *buf)
2246 return sprintf(buf, "%d\n", di->bat_cap.max_mah);
2249 static ssize_t charge_full_store(struct ab8500_fg *di, const char *buf,
2252 unsigned long charge_full;
2253 ssize_t ret = -EINVAL;
2255 ret = strict_strtoul(buf, 10, &charge_full);
2257 dev_dbg(di->dev, "Ret %zd charge_full %lu", ret, charge_full);
2260 di->bat_cap.max_mah = (int) charge_full;
2266 static ssize_t charge_now_show(struct ab8500_fg *di, char *buf)
2268 return sprintf(buf, "%d\n", di->bat_cap.prev_mah);
2271 static ssize_t charge_now_store(struct ab8500_fg *di, const char *buf,
2274 unsigned long charge_now;
2277 ret = strict_strtoul(buf, 10, &charge_now);
2279 dev_dbg(di->dev, "Ret %zd charge_now %lu was %d",
2280 ret, charge_now, di->bat_cap.prev_mah);
2283 di->bat_cap.user_mah = (int) charge_now;
2284 di->flags.user_cap = true;
2286 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2291 static struct ab8500_fg_sysfs_entry charge_full_attr =
2292 __ATTR(charge_full, 0644, charge_full_show, charge_full_store);
2294 static struct ab8500_fg_sysfs_entry charge_now_attr =
2295 __ATTR(charge_now, 0644, charge_now_show, charge_now_store);
2298 ab8500_fg_show(struct kobject *kobj, struct attribute *attr, char *buf)
2300 struct ab8500_fg_sysfs_entry *entry;
2301 struct ab8500_fg *di;
2303 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2304 di = container_of(kobj, struct ab8500_fg, fg_kobject);
2309 return entry->show(di, buf);
2312 ab8500_fg_store(struct kobject *kobj, struct attribute *attr, const char *buf,
2315 struct ab8500_fg_sysfs_entry *entry;
2316 struct ab8500_fg *di;
2318 entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr);
2319 di = container_of(kobj, struct ab8500_fg, fg_kobject);
2324 return entry->store(di, buf, count);
2327 static const struct sysfs_ops ab8500_fg_sysfs_ops = {
2328 .show = ab8500_fg_show,
2329 .store = ab8500_fg_store,
2332 static struct attribute *ab8500_fg_attrs[] = {
2333 &charge_full_attr.attr,
2334 &charge_now_attr.attr,
2338 static struct kobj_type ab8500_fg_ktype = {
2339 .sysfs_ops = &ab8500_fg_sysfs_ops,
2340 .default_attrs = ab8500_fg_attrs,
2344 * ab8500_chargalg_sysfs_exit() - de-init of sysfs entry
2345 * @di: pointer to the struct ab8500_chargalg
2347 * This function removes the entry in sysfs.
2349 static void ab8500_fg_sysfs_exit(struct ab8500_fg *di)
2351 kobject_del(&di->fg_kobject);
2355 * ab8500_chargalg_sysfs_init() - init of sysfs entry
2356 * @di: pointer to the struct ab8500_chargalg
2358 * This function adds an entry in sysfs.
2359 * Returns error code in case of failure else 0(on success)
2361 static int ab8500_fg_sysfs_init(struct ab8500_fg *di)
2365 ret = kobject_init_and_add(&di->fg_kobject,
2369 dev_err(di->dev, "failed to create sysfs entry\n");
2373 /* Exposure to the sysfs interface <<END>> */
2375 #if defined(CONFIG_PM)
2376 static int ab8500_fg_resume(struct platform_device *pdev)
2378 struct ab8500_fg *di = platform_get_drvdata(pdev);
2381 * Change state if we're not charging. If we're charging we will wake
2384 if (!di->flags.charging) {
2385 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_WAKEUP);
2386 queue_work(di->fg_wq, &di->fg_work);
2392 static int ab8500_fg_suspend(struct platform_device *pdev,
2395 struct ab8500_fg *di = platform_get_drvdata(pdev);
2397 flush_delayed_work(&di->fg_periodic_work);
2400 * If the FG is enabled we will disable it before going to suspend
2401 * only if we're not charging
2403 if (di->flags.fg_enabled && !di->flags.charging)
2404 ab8500_fg_coulomb_counter(di, false);
2409 #define ab8500_fg_suspend NULL
2410 #define ab8500_fg_resume NULL
2413 static int ab8500_fg_remove(struct platform_device *pdev)
2416 struct ab8500_fg *di = platform_get_drvdata(pdev);
2418 list_del(&di->node);
2420 /* Disable coulomb counter */
2421 ret = ab8500_fg_coulomb_counter(di, false);
2423 dev_err(di->dev, "failed to disable coulomb counter\n");
2425 destroy_workqueue(di->fg_wq);
2426 ab8500_fg_sysfs_exit(di);
2428 flush_scheduled_work();
2429 power_supply_unregister(&di->fg_psy);
2430 platform_set_drvdata(pdev, NULL);
2434 /* ab8500 fg driver interrupts and their respective isr */
2435 static struct ab8500_fg_interrupts ab8500_fg_irq[] = {
2436 {"NCONV_ACCU", ab8500_fg_cc_convend_handler},
2437 {"BATT_OVV", ab8500_fg_batt_ovv_handler},
2438 {"LOW_BAT_F", ab8500_fg_lowbatf_handler},
2439 {"CC_INT_CALIB", ab8500_fg_cc_int_calib_handler},
2440 {"CCEOC", ab8500_fg_cc_data_end_handler},
2443 static char *supply_interface[] = {
2448 static int ab8500_fg_probe(struct platform_device *pdev)
2450 struct device_node *np = pdev->dev.of_node;
2451 struct ab8500_fg *di;
2455 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
2457 dev_err(&pdev->dev, "%s no mem for ab8500_fg\n", __func__);
2460 di->bat = pdev->mfd_cell->platform_data;
2463 ret = bmdevs_of_probe(&pdev->dev, np, &di->bat);
2466 "failed to get battery information\n");
2470 dev_err(&pdev->dev, "missing dt node for ab8500_fg\n");
2474 dev_info(&pdev->dev, "falling back to legacy platform data\n");
2477 mutex_init(&di->cc_lock);
2479 /* get parent data */
2480 di->dev = &pdev->dev;
2481 di->parent = dev_get_drvdata(pdev->dev.parent);
2482 di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
2484 di->fg_psy.name = "ab8500_fg";
2485 di->fg_psy.type = POWER_SUPPLY_TYPE_BATTERY;
2486 di->fg_psy.properties = ab8500_fg_props;
2487 di->fg_psy.num_properties = ARRAY_SIZE(ab8500_fg_props);
2488 di->fg_psy.get_property = ab8500_fg_get_property;
2489 di->fg_psy.supplied_to = supply_interface;
2490 di->fg_psy.num_supplicants = ARRAY_SIZE(supply_interface),
2491 di->fg_psy.external_power_changed = ab8500_fg_external_power_changed;
2493 di->bat_cap.max_mah_design = MILLI_TO_MICRO *
2494 di->bat->bat_type[di->bat->batt_id].charge_full_design;
2496 di->bat_cap.max_mah = di->bat_cap.max_mah_design;
2498 di->vbat_nom = di->bat->bat_type[di->bat->batt_id].nominal_voltage;
2500 di->init_capacity = true;
2502 ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
2503 ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
2505 /* Create a work queue for running the FG algorithm */
2506 di->fg_wq = create_singlethread_workqueue("ab8500_fg_wq");
2507 if (di->fg_wq == NULL) {
2508 dev_err(di->dev, "failed to create work queue\n");
2512 /* Init work for running the fg algorithm instantly */
2513 INIT_WORK(&di->fg_work, ab8500_fg_instant_work);
2515 /* Init work for getting the battery accumulated current */
2516 INIT_WORK(&di->fg_acc_cur_work, ab8500_fg_acc_cur_work);
2518 /* Init work for reinitialising the fg algorithm */
2519 INIT_DEFERRABLE_WORK(&di->fg_reinit_work,
2520 ab8500_fg_reinit_work);
2522 /* Work delayed Queue to run the state machine */
2523 INIT_DEFERRABLE_WORK(&di->fg_periodic_work,
2524 ab8500_fg_periodic_work);
2526 /* Work to check low battery condition */
2527 INIT_DEFERRABLE_WORK(&di->fg_low_bat_work,
2528 ab8500_fg_low_bat_work);
2530 /* Init work for HW failure check */
2531 INIT_DEFERRABLE_WORK(&di->fg_check_hw_failure_work,
2532 ab8500_fg_check_hw_failure_work);
2534 /* Initialize OVV, and other registers */
2535 ret = ab8500_fg_init_hw_registers(di);
2537 dev_err(di->dev, "failed to initialize registers\n");
2538 goto free_inst_curr_wq;
2541 /* Consider battery unknown until we're informed otherwise */
2542 di->flags.batt_unknown = true;
2543 di->flags.batt_id_received = false;
2545 /* Register FG power supply class */
2546 ret = power_supply_register(di->dev, &di->fg_psy);
2548 dev_err(di->dev, "failed to register FG psy\n");
2549 goto free_inst_curr_wq;
2552 di->fg_samples = SEC_TO_SAMPLE(di->bat->fg_params->init_timer);
2553 ab8500_fg_coulomb_counter(di, true);
2555 /* Initialize completion used to notify completion of inst current */
2556 init_completion(&di->ab8500_fg_complete);
2558 /* Register interrupts */
2559 for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq); i++) {
2560 irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name);
2561 ret = request_threaded_irq(irq, NULL, ab8500_fg_irq[i].isr,
2562 IRQF_SHARED | IRQF_NO_SUSPEND,
2563 ab8500_fg_irq[i].name, di);
2566 dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
2567 , ab8500_fg_irq[i].name, irq, ret);
2570 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
2571 ab8500_fg_irq[i].name, irq, ret);
2573 di->irq = platform_get_irq_byname(pdev, "CCEOC");
2574 disable_irq(di->irq);
2576 platform_set_drvdata(pdev, di);
2578 ret = ab8500_fg_sysfs_init(di);
2580 dev_err(di->dev, "failed to create sysfs entry\n");
2584 /* Calibrate the fg first time */
2585 di->flags.calibrate = true;
2586 di->calib_state = AB8500_FG_CALIB_INIT;
2588 /* Use room temp as default value until we get an update from driver. */
2591 /* Run the FG algorithm */
2592 queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
2594 list_add_tail(&di->node, &ab8500_fg_list);
2599 power_supply_unregister(&di->fg_psy);
2601 /* We also have to free all successfully registered irqs */
2602 for (i = i - 1; i >= 0; i--) {
2603 irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name);
2607 destroy_workqueue(di->fg_wq);
2611 static const struct of_device_id ab8500_fg_match[] = {
2612 { .compatible = "stericsson,ab8500-fg", },
2616 static struct platform_driver ab8500_fg_driver = {
2617 .probe = ab8500_fg_probe,
2618 .remove = ab8500_fg_remove,
2619 .suspend = ab8500_fg_suspend,
2620 .resume = ab8500_fg_resume,
2622 .name = "ab8500-fg",
2623 .owner = THIS_MODULE,
2624 .of_match_table = ab8500_fg_match,
2628 static int __init ab8500_fg_init(void)
2630 return platform_driver_register(&ab8500_fg_driver);
2633 static void __exit ab8500_fg_exit(void)
2635 platform_driver_unregister(&ab8500_fg_driver);
2638 subsys_initcall_sync(ab8500_fg_init);
2639 module_exit(ab8500_fg_exit);
2641 MODULE_LICENSE("GPL v2");
2642 MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
2643 MODULE_ALIAS("platform:ab8500-fg");
2644 MODULE_DESCRIPTION("AB8500 Fuel Gauge driver");