| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (C) ST-Ericsson AB 2012 |
| * |
| * Main and Back-up battery management driver. |
| * |
| * Note: Backup battery management is required in case of Li-Ion battery and not |
| * for capacitive battery. HREF boards have capacitive battery and hence backup |
| * battery management is not used and the supported code is available in this |
| * driver. |
| * |
| * Author: |
| * Johan Palsson <johan.palsson@stericsson.com> |
| * Karl Komierowski <karl.komierowski@stericsson.com> |
| * Arun R Murthy <arun.murthy@stericsson.com> |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/device.h> |
| #include <linux/interrupt.h> |
| #include <linux/platform_device.h> |
| #include <linux/power_supply.h> |
| #include <linux/kobject.h> |
| #include <linux/slab.h> |
| #include <linux/delay.h> |
| #include <linux/time.h> |
| #include <linux/time64.h> |
| #include <linux/of.h> |
| #include <linux/completion.h> |
| #include <linux/mfd/core.h> |
| #include <linux/mfd/abx500.h> |
| #include <linux/mfd/abx500/ab8500.h> |
| #include <linux/mfd/abx500/ab8500-bm.h> |
| #include <linux/iio/consumer.h> |
| #include <linux/kernel.h> |
| |
| #define MILLI_TO_MICRO 1000 |
| #define FG_LSB_IN_MA 1627 |
| #define QLSB_NANO_AMP_HOURS_X10 1071 |
| #define INS_CURR_TIMEOUT (3 * HZ) |
| |
| #define SEC_TO_SAMPLE(S) (S * 4) |
| |
| #define NBR_AVG_SAMPLES 20 |
| |
| #define LOW_BAT_CHECK_INTERVAL (HZ / 16) /* 62.5 ms */ |
| |
| #define VALID_CAPACITY_SEC (45 * 60) /* 45 minutes */ |
| #define BATT_OK_MIN 2360 /* mV */ |
| #define BATT_OK_INCREMENT 50 /* mV */ |
| #define BATT_OK_MAX_NR_INCREMENTS 0xE |
| |
| /* FG constants */ |
| #define BATT_OVV 0x01 |
| |
| #define interpolate(x, x1, y1, x2, y2) \ |
| ((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1)))); |
| |
| /** |
| * struct ab8500_fg_interrupts - ab8500 fg interupts |
| * @name: name of the interrupt |
| * @isr function pointer to the isr |
| */ |
| struct ab8500_fg_interrupts { |
| char *name; |
| irqreturn_t (*isr)(int irq, void *data); |
| }; |
| |
| enum ab8500_fg_discharge_state { |
| AB8500_FG_DISCHARGE_INIT, |
| AB8500_FG_DISCHARGE_INITMEASURING, |
| AB8500_FG_DISCHARGE_INIT_RECOVERY, |
| AB8500_FG_DISCHARGE_RECOVERY, |
| AB8500_FG_DISCHARGE_READOUT_INIT, |
| AB8500_FG_DISCHARGE_READOUT, |
| AB8500_FG_DISCHARGE_WAKEUP, |
| }; |
| |
| static char *discharge_state[] = { |
| "DISCHARGE_INIT", |
| "DISCHARGE_INITMEASURING", |
| "DISCHARGE_INIT_RECOVERY", |
| "DISCHARGE_RECOVERY", |
| "DISCHARGE_READOUT_INIT", |
| "DISCHARGE_READOUT", |
| "DISCHARGE_WAKEUP", |
| }; |
| |
| enum ab8500_fg_charge_state { |
| AB8500_FG_CHARGE_INIT, |
| AB8500_FG_CHARGE_READOUT, |
| }; |
| |
| static char *charge_state[] = { |
| "CHARGE_INIT", |
| "CHARGE_READOUT", |
| }; |
| |
| enum ab8500_fg_calibration_state { |
| AB8500_FG_CALIB_INIT, |
| AB8500_FG_CALIB_WAIT, |
| AB8500_FG_CALIB_END, |
| }; |
| |
| struct ab8500_fg_avg_cap { |
| int avg; |
| int samples[NBR_AVG_SAMPLES]; |
| time64_t time_stamps[NBR_AVG_SAMPLES]; |
| int pos; |
| int nbr_samples; |
| int sum; |
| }; |
| |
| struct ab8500_fg_cap_scaling { |
| bool enable; |
| int cap_to_scale[2]; |
| int disable_cap_level; |
| int scaled_cap; |
| }; |
| |
| struct ab8500_fg_battery_capacity { |
| int max_mah_design; |
| int max_mah; |
| int mah; |
| int permille; |
| int level; |
| int prev_mah; |
| int prev_percent; |
| int prev_level; |
| int user_mah; |
| struct ab8500_fg_cap_scaling cap_scale; |
| }; |
| |
| struct ab8500_fg_flags { |
| bool fg_enabled; |
| bool conv_done; |
| bool charging; |
| bool fully_charged; |
| bool force_full; |
| bool low_bat_delay; |
| bool low_bat; |
| bool bat_ovv; |
| bool batt_unknown; |
| bool calibrate; |
| bool user_cap; |
| bool batt_id_received; |
| }; |
| |
| struct inst_curr_result_list { |
| struct list_head list; |
| int *result; |
| }; |
| |
| /** |
| * struct ab8500_fg - ab8500 FG device information |
| * @dev: Pointer to the structure device |
| * @node: a list of AB8500 FGs, hence prepared for reentrance |
| * @irq holds the CCEOC interrupt number |
| * @vbat: Battery voltage in mV |
| * @vbat_nom: Nominal battery voltage in mV |
| * @inst_curr: Instantenous battery current in mA |
| * @avg_curr: Average battery current in mA |
| * @bat_temp battery temperature |
| * @fg_samples: Number of samples used in the FG accumulation |
| * @accu_charge: Accumulated charge from the last conversion |
| * @recovery_cnt: Counter for recovery mode |
| * @high_curr_cnt: Counter for high current mode |
| * @init_cnt: Counter for init mode |
| * @low_bat_cnt Counter for number of consecutive low battery measures |
| * @nbr_cceoc_irq_cnt Counter for number of CCEOC irqs received since enabled |
| * @recovery_needed: Indicate if recovery is needed |
| * @high_curr_mode: Indicate if we're in high current mode |
| * @init_capacity: Indicate if initial capacity measuring should be done |
| * @turn_off_fg: True if fg was off before current measurement |
| * @calib_state State during offset calibration |
| * @discharge_state: Current discharge state |
| * @charge_state: Current charge state |
| * @ab8500_fg_started Completion struct used for the instant current start |
| * @ab8500_fg_complete Completion struct used for the instant current reading |
| * @flags: Structure for information about events triggered |
| * @bat_cap: Structure for battery capacity specific parameters |
| * @avg_cap: Average capacity filter |
| * @parent: Pointer to the struct ab8500 |
| * @main_bat_v: ADC channel for the main battery voltage |
| * @bm: Platform specific battery management information |
| * @fg_psy: Structure that holds the FG specific battery properties |
| * @fg_wq: Work queue for running the FG algorithm |
| * @fg_periodic_work: Work to run the FG algorithm periodically |
| * @fg_low_bat_work: Work to check low bat condition |
| * @fg_reinit_work Work used to reset and reinitialise the FG algorithm |
| * @fg_work: Work to run the FG algorithm instantly |
| * @fg_acc_cur_work: Work to read the FG accumulator |
| * @fg_check_hw_failure_work: Work for checking HW state |
| * @cc_lock: Mutex for locking the CC |
| * @fg_kobject: Structure of type kobject |
| */ |
| struct ab8500_fg { |
| struct device *dev; |
| struct list_head node; |
| int irq; |
| int vbat; |
| int vbat_nom; |
| int inst_curr; |
| int avg_curr; |
| int bat_temp; |
| int fg_samples; |
| int accu_charge; |
| int recovery_cnt; |
| int high_curr_cnt; |
| int init_cnt; |
| int low_bat_cnt; |
| int nbr_cceoc_irq_cnt; |
| bool recovery_needed; |
| bool high_curr_mode; |
| bool init_capacity; |
| bool turn_off_fg; |
| enum ab8500_fg_calibration_state calib_state; |
| enum ab8500_fg_discharge_state discharge_state; |
| enum ab8500_fg_charge_state charge_state; |
| struct completion ab8500_fg_started; |
| struct completion ab8500_fg_complete; |
| struct ab8500_fg_flags flags; |
| struct ab8500_fg_battery_capacity bat_cap; |
| struct ab8500_fg_avg_cap avg_cap; |
| struct ab8500 *parent; |
| struct iio_channel *main_bat_v; |
| struct abx500_bm_data *bm; |
| struct power_supply *fg_psy; |
| struct workqueue_struct *fg_wq; |
| struct delayed_work fg_periodic_work; |
| struct delayed_work fg_low_bat_work; |
| struct delayed_work fg_reinit_work; |
| struct work_struct fg_work; |
| struct work_struct fg_acc_cur_work; |
| struct delayed_work fg_check_hw_failure_work; |
| struct mutex cc_lock; |
| struct kobject fg_kobject; |
| }; |
| static LIST_HEAD(ab8500_fg_list); |
| |
| /** |
| * ab8500_fg_get() - returns a reference to the primary AB8500 fuel gauge |
| * (i.e. the first fuel gauge in the instance list) |
| */ |
| struct ab8500_fg *ab8500_fg_get(void) |
| { |
| return list_first_entry_or_null(&ab8500_fg_list, struct ab8500_fg, |
| node); |
| } |
| |
| /* Main battery properties */ |
| static enum power_supply_property ab8500_fg_props[] = { |
| POWER_SUPPLY_PROP_VOLTAGE_NOW, |
| POWER_SUPPLY_PROP_CURRENT_NOW, |
| POWER_SUPPLY_PROP_CURRENT_AVG, |
| POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, |
| POWER_SUPPLY_PROP_ENERGY_FULL, |
| POWER_SUPPLY_PROP_ENERGY_NOW, |
| POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, |
| POWER_SUPPLY_PROP_CHARGE_FULL, |
| POWER_SUPPLY_PROP_CHARGE_NOW, |
| POWER_SUPPLY_PROP_CAPACITY, |
| POWER_SUPPLY_PROP_CAPACITY_LEVEL, |
| }; |
| |
| /* |
| * This array maps the raw hex value to lowbat voltage used by the AB8500 |
| * Values taken from the UM0836 |
| */ |
| static int ab8500_fg_lowbat_voltage_map[] = { |
| 2300 , |
| 2325 , |
| 2350 , |
| 2375 , |
| 2400 , |
| 2425 , |
| 2450 , |
| 2475 , |
| 2500 , |
| 2525 , |
| 2550 , |
| 2575 , |
| 2600 , |
| 2625 , |
| 2650 , |
| 2675 , |
| 2700 , |
| 2725 , |
| 2750 , |
| 2775 , |
| 2800 , |
| 2825 , |
| 2850 , |
| 2875 , |
| 2900 , |
| 2925 , |
| 2950 , |
| 2975 , |
| 3000 , |
| 3025 , |
| 3050 , |
| 3075 , |
| 3100 , |
| 3125 , |
| 3150 , |
| 3175 , |
| 3200 , |
| 3225 , |
| 3250 , |
| 3275 , |
| 3300 , |
| 3325 , |
| 3350 , |
| 3375 , |
| 3400 , |
| 3425 , |
| 3450 , |
| 3475 , |
| 3500 , |
| 3525 , |
| 3550 , |
| 3575 , |
| 3600 , |
| 3625 , |
| 3650 , |
| 3675 , |
| 3700 , |
| 3725 , |
| 3750 , |
| 3775 , |
| 3800 , |
| 3825 , |
| 3850 , |
| 3850 , |
| }; |
| |
| static u8 ab8500_volt_to_regval(int voltage) |
| { |
| int i; |
| |
| if (voltage < ab8500_fg_lowbat_voltage_map[0]) |
| return 0; |
| |
| for (i = 0; i < ARRAY_SIZE(ab8500_fg_lowbat_voltage_map); i++) { |
| if (voltage < ab8500_fg_lowbat_voltage_map[i]) |
| return (u8) i - 1; |
| } |
| |
| /* If not captured above, return index of last element */ |
| return (u8) ARRAY_SIZE(ab8500_fg_lowbat_voltage_map) - 1; |
| } |
| |
| /** |
| * ab8500_fg_is_low_curr() - Low or high current mode |
| * @di: pointer to the ab8500_fg structure |
| * @curr: the current to base or our decision on |
| * |
| * Low current mode if the current consumption is below a certain threshold |
| */ |
| static int ab8500_fg_is_low_curr(struct ab8500_fg *di, int curr) |
| { |
| /* |
| * We want to know if we're in low current mode |
| */ |
| if (curr > -di->bm->fg_params->high_curr_threshold) |
| return true; |
| else |
| return false; |
| } |
| |
| /** |
| * ab8500_fg_add_cap_sample() - Add capacity to average filter |
| * @di: pointer to the ab8500_fg structure |
| * @sample: the capacity in mAh to add to the filter |
| * |
| * A capacity is added to the filter and a new mean capacity is calculated and |
| * returned |
| */ |
| static int ab8500_fg_add_cap_sample(struct ab8500_fg *di, int sample) |
| { |
| time64_t now = ktime_get_boottime_seconds(); |
| struct ab8500_fg_avg_cap *avg = &di->avg_cap; |
| |
| do { |
| avg->sum += sample - avg->samples[avg->pos]; |
| avg->samples[avg->pos] = sample; |
| avg->time_stamps[avg->pos] = now; |
| avg->pos++; |
| |
| if (avg->pos == NBR_AVG_SAMPLES) |
| avg->pos = 0; |
| |
| if (avg->nbr_samples < NBR_AVG_SAMPLES) |
| avg->nbr_samples++; |
| |
| /* |
| * Check the time stamp for each sample. If too old, |
| * replace with latest sample |
| */ |
| } while (now - VALID_CAPACITY_SEC > avg->time_stamps[avg->pos]); |
| |
| avg->avg = avg->sum / avg->nbr_samples; |
| |
| return avg->avg; |
| } |
| |
| /** |
| * ab8500_fg_clear_cap_samples() - Clear average filter |
| * @di: pointer to the ab8500_fg structure |
| * |
| * The capacity filter is is reset to zero. |
| */ |
| static void ab8500_fg_clear_cap_samples(struct ab8500_fg *di) |
| { |
| int i; |
| struct ab8500_fg_avg_cap *avg = &di->avg_cap; |
| |
| avg->pos = 0; |
| avg->nbr_samples = 0; |
| avg->sum = 0; |
| avg->avg = 0; |
| |
| for (i = 0; i < NBR_AVG_SAMPLES; i++) { |
| avg->samples[i] = 0; |
| avg->time_stamps[i] = 0; |
| } |
| } |
| |
| /** |
| * ab8500_fg_fill_cap_sample() - Fill average filter |
| * @di: pointer to the ab8500_fg structure |
| * @sample: the capacity in mAh to fill the filter with |
| * |
| * The capacity filter is filled with a capacity in mAh |
| */ |
| static void ab8500_fg_fill_cap_sample(struct ab8500_fg *di, int sample) |
| { |
| int i; |
| time64_t now; |
| struct ab8500_fg_avg_cap *avg = &di->avg_cap; |
| |
| now = ktime_get_boottime_seconds(); |
| |
| for (i = 0; i < NBR_AVG_SAMPLES; i++) { |
| avg->samples[i] = sample; |
| avg->time_stamps[i] = now; |
| } |
| |
| avg->pos = 0; |
| avg->nbr_samples = NBR_AVG_SAMPLES; |
| avg->sum = sample * NBR_AVG_SAMPLES; |
| avg->avg = sample; |
| } |
| |
| /** |
| * ab8500_fg_coulomb_counter() - enable coulomb counter |
| * @di: pointer to the ab8500_fg structure |
| * @enable: enable/disable |
| * |
| * Enable/Disable coulomb counter. |
| * On failure returns negative value. |
| */ |
| static int ab8500_fg_coulomb_counter(struct ab8500_fg *di, bool enable) |
| { |
| int ret = 0; |
| mutex_lock(&di->cc_lock); |
| if (enable) { |
| /* To be able to reprogram the number of samples, we have to |
| * first stop the CC and then enable it again */ |
| ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, |
| AB8500_RTC_CC_CONF_REG, 0x00); |
| if (ret) |
| goto cc_err; |
| |
| /* Program the samples */ |
| ret = abx500_set_register_interruptible(di->dev, |
| AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU, |
| di->fg_samples); |
| if (ret) |
| goto cc_err; |
| |
| /* Start the CC */ |
| ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, |
| AB8500_RTC_CC_CONF_REG, |
| (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA)); |
| if (ret) |
| goto cc_err; |
| |
| di->flags.fg_enabled = true; |
| } else { |
| /* Clear any pending read requests */ |
| ret = abx500_mask_and_set_register_interruptible(di->dev, |
| AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, |
| (RESET_ACCU | READ_REQ), 0); |
| if (ret) |
| goto cc_err; |
| |
| ret = abx500_set_register_interruptible(di->dev, |
| AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU_CTRL, 0); |
| if (ret) |
| goto cc_err; |
| |
| /* Stop the CC */ |
| ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, |
| AB8500_RTC_CC_CONF_REG, 0); |
| if (ret) |
| goto cc_err; |
| |
| di->flags.fg_enabled = false; |
| |
| } |
| dev_dbg(di->dev, " CC enabled: %d Samples: %d\n", |
| enable, di->fg_samples); |
| |
| mutex_unlock(&di->cc_lock); |
| |
| return ret; |
| cc_err: |
| dev_err(di->dev, "%s Enabling coulomb counter failed\n", __func__); |
| mutex_unlock(&di->cc_lock); |
| return ret; |
| } |
| |
| /** |
| * ab8500_fg_inst_curr_start() - start battery instantaneous current |
| * @di: pointer to the ab8500_fg structure |
| * |
| * Returns 0 or error code |
| * Note: This is part "one" and has to be called before |
| * ab8500_fg_inst_curr_finalize() |
| */ |
| int ab8500_fg_inst_curr_start(struct ab8500_fg *di) |
| { |
| u8 reg_val; |
| int ret; |
| |
| mutex_lock(&di->cc_lock); |
| |
| di->nbr_cceoc_irq_cnt = 0; |
| ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, |
| AB8500_RTC_CC_CONF_REG, ®_val); |
| if (ret < 0) |
| goto fail; |
| |
| if (!(reg_val & CC_PWR_UP_ENA)) { |
| dev_dbg(di->dev, "%s Enable FG\n", __func__); |
| di->turn_off_fg = true; |
| |
| /* Program the samples */ |
| ret = abx500_set_register_interruptible(di->dev, |
| AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU, |
| SEC_TO_SAMPLE(10)); |
| if (ret) |
| goto fail; |
| |
| /* Start the CC */ |
| ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, |
| AB8500_RTC_CC_CONF_REG, |
| (CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA)); |
| if (ret) |
| goto fail; |
| } else { |
| di->turn_off_fg = false; |
| } |
| |
| /* Return and WFI */ |
| reinit_completion(&di->ab8500_fg_started); |
| reinit_completion(&di->ab8500_fg_complete); |
| enable_irq(di->irq); |
| |
| /* Note: cc_lock is still locked */ |
| return 0; |
| fail: |
| mutex_unlock(&di->cc_lock); |
| return ret; |
| } |
| |
| /** |
| * ab8500_fg_inst_curr_started() - check if fg conversion has started |
| * @di: pointer to the ab8500_fg structure |
| * |
| * Returns 1 if conversion started, 0 if still waiting |
| */ |
| int ab8500_fg_inst_curr_started(struct ab8500_fg *di) |
| { |
| return completion_done(&di->ab8500_fg_started); |
| } |
| |
| /** |
| * ab8500_fg_inst_curr_done() - check if fg conversion is done |
| * @di: pointer to the ab8500_fg structure |
| * |
| * Returns 1 if conversion done, 0 if still waiting |
| */ |
| int ab8500_fg_inst_curr_done(struct ab8500_fg *di) |
| { |
| return completion_done(&di->ab8500_fg_complete); |
| } |
| |
| /** |
| * ab8500_fg_inst_curr_finalize() - battery instantaneous current |
| * @di: pointer to the ab8500_fg structure |
| * @res: battery instantenous current(on success) |
| * |
| * Returns 0 or an error code |
| * Note: This is part "two" and has to be called at earliest 250 ms |
| * after ab8500_fg_inst_curr_start() |
| */ |
| int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *res) |
| { |
| u8 low, high; |
| int val; |
| int ret; |
| unsigned long timeout; |
| |
| if (!completion_done(&di->ab8500_fg_complete)) { |
| timeout = wait_for_completion_timeout( |
| &di->ab8500_fg_complete, |
| INS_CURR_TIMEOUT); |
| dev_dbg(di->dev, "Finalize time: %d ms\n", |
| jiffies_to_msecs(INS_CURR_TIMEOUT - timeout)); |
| if (!timeout) { |
| ret = -ETIME; |
| disable_irq(di->irq); |
| di->nbr_cceoc_irq_cnt = 0; |
| dev_err(di->dev, "completion timed out [%d]\n", |
| __LINE__); |
| goto fail; |
| } |
| } |
| |
| disable_irq(di->irq); |
| di->nbr_cceoc_irq_cnt = 0; |
| |
| ret = abx500_mask_and_set_register_interruptible(di->dev, |
| AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, |
| READ_REQ, READ_REQ); |
| |
| /* 100uS between read request and read is needed */ |
| usleep_range(100, 100); |
| |
| /* Read CC Sample conversion value Low and high */ |
| ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, |
| AB8500_GASG_CC_SMPL_CNVL_REG, &low); |
| if (ret < 0) |
| goto fail; |
| |
| ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, |
| AB8500_GASG_CC_SMPL_CNVH_REG, &high); |
| if (ret < 0) |
| goto fail; |
| |
| /* |
| * negative value for Discharging |
| * convert 2's compliment into decimal |
| */ |
| if (high & 0x10) |
| val = (low | (high << 8) | 0xFFFFE000); |
| else |
| val = (low | (high << 8)); |
| |
| /* |
| * Convert to unit value in mA |
| * Full scale input voltage is |
| * 63.160mV => LSB = 63.160mV/(4096*res) = 1.542mA |
| * Given a 250ms conversion cycle time the LSB corresponds |
| * to 107.1 nAh. Convert to current by dividing by the conversion |
| * time in hours (250ms = 1 / (3600 * 4)h) |
| * 107.1nAh assumes 10mOhm, but fg_res is in 0.1mOhm |
| */ |
| val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) / |
| (1000 * di->bm->fg_res); |
| |
| if (di->turn_off_fg) { |
| dev_dbg(di->dev, "%s Disable FG\n", __func__); |
| |
| /* Clear any pending read requests */ |
| ret = abx500_set_register_interruptible(di->dev, |
| AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0); |
| if (ret) |
| goto fail; |
| |
| /* Stop the CC */ |
| ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, |
| AB8500_RTC_CC_CONF_REG, 0); |
| if (ret) |
| goto fail; |
| } |
| mutex_unlock(&di->cc_lock); |
| (*res) = val; |
| |
| return 0; |
| fail: |
| mutex_unlock(&di->cc_lock); |
| return ret; |
| } |
| |
| /** |
| * ab8500_fg_inst_curr_blocking() - battery instantaneous current |
| * @di: pointer to the ab8500_fg structure |
| * @res: battery instantenous current(on success) |
| * |
| * Returns 0 else error code |
| */ |
| int ab8500_fg_inst_curr_blocking(struct ab8500_fg *di) |
| { |
| int ret; |
| unsigned long timeout; |
| int res = 0; |
| |
| ret = ab8500_fg_inst_curr_start(di); |
| if (ret) { |
| dev_err(di->dev, "Failed to initialize fg_inst\n"); |
| return 0; |
| } |
| |
| /* Wait for CC to actually start */ |
| if (!completion_done(&di->ab8500_fg_started)) { |
| timeout = wait_for_completion_timeout( |
| &di->ab8500_fg_started, |
| INS_CURR_TIMEOUT); |
| dev_dbg(di->dev, "Start time: %d ms\n", |
| jiffies_to_msecs(INS_CURR_TIMEOUT - timeout)); |
| if (!timeout) { |
| ret = -ETIME; |
| dev_err(di->dev, "completion timed out [%d]\n", |
| __LINE__); |
| goto fail; |
| } |
| } |
| |
| ret = ab8500_fg_inst_curr_finalize(di, &res); |
| if (ret) { |
| dev_err(di->dev, "Failed to finalize fg_inst\n"); |
| return 0; |
| } |
| |
| dev_dbg(di->dev, "%s instant current: %d", __func__, res); |
| return res; |
| fail: |
| disable_irq(di->irq); |
| mutex_unlock(&di->cc_lock); |
| return ret; |
| } |
| |
| /** |
| * ab8500_fg_acc_cur_work() - average battery current |
| * @work: pointer to the work_struct structure |
| * |
| * Updated the average battery current obtained from the |
| * coulomb counter. |
| */ |
| static void ab8500_fg_acc_cur_work(struct work_struct *work) |
| { |
| int val; |
| int ret; |
| u8 low, med, high; |
| |
| struct ab8500_fg *di = container_of(work, |
| struct ab8500_fg, fg_acc_cur_work); |
| |
| mutex_lock(&di->cc_lock); |
| ret = abx500_set_register_interruptible(di->dev, AB8500_GAS_GAUGE, |
| AB8500_GASG_CC_NCOV_ACCU_CTRL, RD_NCONV_ACCU_REQ); |
| if (ret) |
| goto exit; |
| |
| ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, |
| AB8500_GASG_CC_NCOV_ACCU_LOW, &low); |
| if (ret < 0) |
| goto exit; |
| |
| ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, |
| AB8500_GASG_CC_NCOV_ACCU_MED, &med); |
| if (ret < 0) |
| goto exit; |
| |
| ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, |
| AB8500_GASG_CC_NCOV_ACCU_HIGH, &high); |
| if (ret < 0) |
| goto exit; |
| |
| /* Check for sign bit in case of negative value, 2's compliment */ |
| if (high & 0x10) |
| val = (low | (med << 8) | (high << 16) | 0xFFE00000); |
| else |
| val = (low | (med << 8) | (high << 16)); |
| |
| /* |
| * Convert to uAh |
| * Given a 250ms conversion cycle time the LSB corresponds |
| * to 112.9 nAh. |
| * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm |
| */ |
| di->accu_charge = (val * QLSB_NANO_AMP_HOURS_X10) / |
| (100 * di->bm->fg_res); |
| |
| /* |
| * Convert to unit value in mA |
| * by dividing by the conversion |
| * time in hours (= samples / (3600 * 4)h) |
| * and multiply with 1000 |
| */ |
| di->avg_curr = (val * QLSB_NANO_AMP_HOURS_X10 * 36) / |
| (1000 * di->bm->fg_res * (di->fg_samples / 4)); |
| |
| di->flags.conv_done = true; |
| |
| mutex_unlock(&di->cc_lock); |
| |
| queue_work(di->fg_wq, &di->fg_work); |
| |
| dev_dbg(di->dev, "fg_res: %d, fg_samples: %d, gasg: %d, accu_charge: %d \n", |
| di->bm->fg_res, di->fg_samples, val, di->accu_charge); |
| return; |
| exit: |
| dev_err(di->dev, |
| "Failed to read or write gas gauge registers\n"); |
| mutex_unlock(&di->cc_lock); |
| queue_work(di->fg_wq, &di->fg_work); |
| } |
| |
| /** |
| * ab8500_fg_bat_voltage() - get battery voltage |
| * @di: pointer to the ab8500_fg structure |
| * |
| * Returns battery voltage(on success) else error code |
| */ |
| static int ab8500_fg_bat_voltage(struct ab8500_fg *di) |
| { |
| int vbat, ret; |
| static int prev; |
| |
| ret = iio_read_channel_processed(di->main_bat_v, &vbat); |
| if (ret < 0) { |
| dev_err(di->dev, |
| "%s ADC conversion failed, using previous value\n", |
| __func__); |
| return prev; |
| } |
| |
| prev = vbat; |
| return vbat; |
| } |
| |
| /** |
| * ab8500_fg_volt_to_capacity() - Voltage based capacity |
| * @di: pointer to the ab8500_fg structure |
| * @voltage: The voltage to convert to a capacity |
| * |
| * Returns battery capacity in per mille based on voltage |
| */ |
| static int ab8500_fg_volt_to_capacity(struct ab8500_fg *di, int voltage) |
| { |
| int i, tbl_size; |
| const struct abx500_v_to_cap *tbl; |
| int cap = 0; |
| |
| tbl = di->bm->bat_type[di->bm->batt_id].v_to_cap_tbl, |
| tbl_size = di->bm->bat_type[di->bm->batt_id].n_v_cap_tbl_elements; |
| |
| for (i = 0; i < tbl_size; ++i) { |
| if (voltage > tbl[i].voltage) |
| break; |
| } |
| |
| if ((i > 0) && (i < tbl_size)) { |
| cap = interpolate(voltage, |
| tbl[i].voltage, |
| tbl[i].capacity * 10, |
| tbl[i-1].voltage, |
| tbl[i-1].capacity * 10); |
| } else if (i == 0) { |
| cap = 1000; |
| } else { |
| cap = 0; |
| } |
| |
| dev_dbg(di->dev, "%s Vbat: %d, Cap: %d per mille", |
| __func__, voltage, cap); |
| |
| return cap; |
| } |
| |
| /** |
| * ab8500_fg_uncomp_volt_to_capacity() - Uncompensated voltage based capacity |
| * @di: pointer to the ab8500_fg structure |
| * |
| * Returns battery capacity based on battery voltage that is not compensated |
| * for the voltage drop due to the load |
| */ |
| static int ab8500_fg_uncomp_volt_to_capacity(struct ab8500_fg *di) |
| { |
| di->vbat = ab8500_fg_bat_voltage(di); |
| return ab8500_fg_volt_to_capacity(di, di->vbat); |
| } |
| |
| /** |
| * ab8500_fg_battery_resistance() - Returns the battery inner resistance |
| * @di: pointer to the ab8500_fg structure |
| * |
| * Returns battery inner resistance added with the fuel gauge resistor value |
| * to get the total resistance in the whole link from gnd to bat+ node. |
| */ |
| static int ab8500_fg_battery_resistance(struct ab8500_fg *di) |
| { |
| int i, tbl_size; |
| const struct batres_vs_temp *tbl; |
| int resist = 0; |
| |
| tbl = di->bm->bat_type[di->bm->batt_id].batres_tbl; |
| tbl_size = di->bm->bat_type[di->bm->batt_id].n_batres_tbl_elements; |
| |
| for (i = 0; i < tbl_size; ++i) { |
| if (di->bat_temp / 10 > tbl[i].temp) |
| break; |
| } |
| |
| if ((i > 0) && (i < tbl_size)) { |
| resist = interpolate(di->bat_temp / 10, |
| tbl[i].temp, |
| tbl[i].resist, |
| tbl[i-1].temp, |
| tbl[i-1].resist); |
| } else if (i == 0) { |
| resist = tbl[0].resist; |
| } else { |
| resist = tbl[tbl_size - 1].resist; |
| } |
| |
| dev_dbg(di->dev, "%s Temp: %d battery internal resistance: %d" |
| " fg resistance %d, total: %d (mOhm)\n", |
| __func__, di->bat_temp, resist, di->bm->fg_res / 10, |
| (di->bm->fg_res / 10) + resist); |
| |
| /* fg_res variable is in 0.1mOhm */ |
| resist += di->bm->fg_res / 10; |
| |
| return resist; |
| } |
| |
| /** |
| * ab8500_fg_load_comp_volt_to_capacity() - Load compensated voltage based capacity |
| * @di: pointer to the ab8500_fg structure |
| * |
| * Returns battery capacity based on battery voltage that is load compensated |
| * for the voltage drop |
| */ |
| static int ab8500_fg_load_comp_volt_to_capacity(struct ab8500_fg *di) |
| { |
| int vbat_comp, res; |
| int i = 0; |
| int vbat = 0; |
| |
| ab8500_fg_inst_curr_start(di); |
| |
| do { |
| vbat += ab8500_fg_bat_voltage(di); |
| i++; |
| usleep_range(5000, 6000); |
| } while (!ab8500_fg_inst_curr_done(di)); |
| |
| ab8500_fg_inst_curr_finalize(di, &di->inst_curr); |
| |
| di->vbat = vbat / i; |
| res = ab8500_fg_battery_resistance(di); |
| |
| /* Use Ohms law to get the load compensated voltage */ |
| vbat_comp = di->vbat - (di->inst_curr * res) / 1000; |
| |
| dev_dbg(di->dev, "%s Measured Vbat: %dmV,Compensated Vbat %dmV, " |
| "R: %dmOhm, Current: %dmA Vbat Samples: %d\n", |
| __func__, di->vbat, vbat_comp, res, di->inst_curr, i); |
| |
| return ab8500_fg_volt_to_capacity(di, vbat_comp); |
| } |
| |
| /** |
| * ab8500_fg_convert_mah_to_permille() - Capacity in mAh to permille |
| * @di: pointer to the ab8500_fg structure |
| * @cap_mah: capacity in mAh |
| * |
| * Converts capacity in mAh to capacity in permille |
| */ |
| static int ab8500_fg_convert_mah_to_permille(struct ab8500_fg *di, int cap_mah) |
| { |
| return (cap_mah * 1000) / di->bat_cap.max_mah_design; |
| } |
| |
| /** |
| * ab8500_fg_convert_permille_to_mah() - Capacity in permille to mAh |
| * @di: pointer to the ab8500_fg structure |
| * @cap_pm: capacity in permille |
| * |
| * Converts capacity in permille to capacity in mAh |
| */ |
| static int ab8500_fg_convert_permille_to_mah(struct ab8500_fg *di, int cap_pm) |
| { |
| return cap_pm * di->bat_cap.max_mah_design / 1000; |
| } |
| |
| /** |
| * ab8500_fg_convert_mah_to_uwh() - Capacity in mAh to uWh |
| * @di: pointer to the ab8500_fg structure |
| * @cap_mah: capacity in mAh |
| * |
| * Converts capacity in mAh to capacity in uWh |
| */ |
| static int ab8500_fg_convert_mah_to_uwh(struct ab8500_fg *di, int cap_mah) |
| { |
| u64 div_res; |
| u32 div_rem; |
| |
| div_res = ((u64) cap_mah) * ((u64) di->vbat_nom); |
| div_rem = do_div(div_res, 1000); |
| |
| /* Make sure to round upwards if necessary */ |
| if (div_rem >= 1000 / 2) |
| div_res++; |
| |
| return (int) div_res; |
| } |
| |
| /** |
| * ab8500_fg_calc_cap_charging() - Calculate remaining capacity while charging |
| * @di: pointer to the ab8500_fg structure |
| * |
| * Return the capacity in mAh based on previous calculated capcity and the FG |
| * accumulator register value. The filter is filled with this capacity |
| */ |
| static int ab8500_fg_calc_cap_charging(struct ab8500_fg *di) |
| { |
| dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n", |
| __func__, |
| di->bat_cap.mah, |
| di->accu_charge); |
| |
| /* Capacity should not be less than 0 */ |
| if (di->bat_cap.mah + di->accu_charge > 0) |
| di->bat_cap.mah += di->accu_charge; |
| else |
| di->bat_cap.mah = 0; |
| /* |
| * We force capacity to 100% once when the algorithm |
| * reports that it's full. |
| */ |
| if (di->bat_cap.mah >= di->bat_cap.max_mah_design || |
| di->flags.force_full) { |
| di->bat_cap.mah = di->bat_cap.max_mah_design; |
| } |
| |
| ab8500_fg_fill_cap_sample(di, di->bat_cap.mah); |
| di->bat_cap.permille = |
| ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah); |
| |
| /* We need to update battery voltage and inst current when charging */ |
| di->vbat = ab8500_fg_bat_voltage(di); |
| di->inst_curr = ab8500_fg_inst_curr_blocking(di); |
| |
| return di->bat_cap.mah; |
| } |
| |
| /** |
| * ab8500_fg_calc_cap_discharge_voltage() - Capacity in discharge with voltage |
| * @di: pointer to the ab8500_fg structure |
| * @comp: if voltage should be load compensated before capacity calc |
| * |
| * Return the capacity in mAh based on the battery voltage. The voltage can |
| * either be load compensated or not. This value is added to the filter and a |
| * new mean value is calculated and returned. |
| */ |
| static int ab8500_fg_calc_cap_discharge_voltage(struct ab8500_fg *di, bool comp) |
| { |
| int permille, mah; |
| |
| if (comp) |
| permille = ab8500_fg_load_comp_volt_to_capacity(di); |
| else |
| permille = ab8500_fg_uncomp_volt_to_capacity(di); |
| |
| mah = ab8500_fg_convert_permille_to_mah(di, permille); |
| |
| di->bat_cap.mah = ab8500_fg_add_cap_sample(di, mah); |
| di->bat_cap.permille = |
| ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah); |
| |
| return di->bat_cap.mah; |
| } |
| |
| /** |
| * ab8500_fg_calc_cap_discharge_fg() - Capacity in discharge with FG |
| * @di: pointer to the ab8500_fg structure |
| * |
| * Return the capacity in mAh based on previous calculated capcity and the FG |
| * accumulator register value. This value is added to the filter and a |
| * new mean value is calculated and returned. |
| */ |
| static int ab8500_fg_calc_cap_discharge_fg(struct ab8500_fg *di) |
| { |
| int permille_volt, permille; |
| |
| dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n", |
| __func__, |
| di->bat_cap.mah, |
| di->accu_charge); |
| |
| /* Capacity should not be less than 0 */ |
| if (di->bat_cap.mah + di->accu_charge > 0) |
| di->bat_cap.mah += di->accu_charge; |
| else |
| di->bat_cap.mah = 0; |
| |
| if (di->bat_cap.mah >= di->bat_cap.max_mah_design) |
| di->bat_cap.mah = di->bat_cap.max_mah_design; |
| |
| /* |
| * Check against voltage based capacity. It can not be lower |
| * than what the uncompensated voltage says |
| */ |
| permille = ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah); |
| permille_volt = ab8500_fg_uncomp_volt_to_capacity(di); |
| |
| if (permille < permille_volt) { |
| di->bat_cap.permille = permille_volt; |
| di->bat_cap.mah = ab8500_fg_convert_permille_to_mah(di, |
| di->bat_cap.permille); |
| |
| dev_dbg(di->dev, "%s voltage based: perm %d perm_volt %d\n", |
| __func__, |
| permille, |
| permille_volt); |
| |
| ab8500_fg_fill_cap_sample(di, di->bat_cap.mah); |
| } else { |
| ab8500_fg_fill_cap_sample(di, di->bat_cap.mah); |
| di->bat_cap.permille = |
| ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah); |
| } |
| |
| return di->bat_cap.mah; |
| } |
| |
| /** |
| * ab8500_fg_capacity_level() - Get the battery capacity level |
| * @di: pointer to the ab8500_fg structure |
| * |
| * Get the battery capacity level based on the capacity in percent |
| */ |
| static int ab8500_fg_capacity_level(struct ab8500_fg *di) |
| { |
| int ret, percent; |
| |
| percent = DIV_ROUND_CLOSEST(di->bat_cap.permille, 10); |
| |
| if (percent <= di->bm->cap_levels->critical || |
| di->flags.low_bat) |
| ret = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; |
| else if (percent <= di->bm->cap_levels->low) |
| ret = POWER_SUPPLY_CAPACITY_LEVEL_LOW; |
| else if (percent <= di->bm->cap_levels->normal) |
| ret = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; |
| else if (percent <= di->bm->cap_levels->high) |
| ret = POWER_SUPPLY_CAPACITY_LEVEL_HIGH; |
| else |
| ret = POWER_SUPPLY_CAPACITY_LEVEL_FULL; |
| |
| return ret; |
| } |
| |
| /** |
| * ab8500_fg_calculate_scaled_capacity() - Capacity scaling |
| * @di: pointer to the ab8500_fg structure |
| * |
| * Calculates the capacity to be shown to upper layers. Scales the capacity |
| * to have 100% as a reference from the actual capacity upon removal of charger |
| * when charging is in maintenance mode. |
| */ |
| static int ab8500_fg_calculate_scaled_capacity(struct ab8500_fg *di) |
| { |
| struct ab8500_fg_cap_scaling *cs = &di->bat_cap.cap_scale; |
| int capacity = di->bat_cap.prev_percent; |
| |
| if (!cs->enable) |
| return capacity; |
| |
| /* |
| * As long as we are in fully charge mode scale the capacity |
| * to show 100%. |
| */ |
| if (di->flags.fully_charged) { |
| cs->cap_to_scale[0] = 100; |
| cs->cap_to_scale[1] = |
| max(capacity, di->bm->fg_params->maint_thres); |
| dev_dbg(di->dev, "Scale cap with %d/%d\n", |
| cs->cap_to_scale[0], cs->cap_to_scale[1]); |
| } |
| |
| /* Calculates the scaled capacity. */ |
| if ((cs->cap_to_scale[0] != cs->cap_to_scale[1]) |
| && (cs->cap_to_scale[1] > 0)) |
| capacity = min(100, |
| DIV_ROUND_CLOSEST(di->bat_cap.prev_percent * |
| cs->cap_to_scale[0], |
| cs->cap_to_scale[1])); |
| |
| if (di->flags.charging) { |
| if (capacity < cs->disable_cap_level) { |
| cs->disable_cap_level = capacity; |
| dev_dbg(di->dev, "Cap to stop scale lowered %d%%\n", |
| cs->disable_cap_level); |
| } else if (!di->flags.fully_charged) { |
| if (di->bat_cap.prev_percent >= |
| cs->disable_cap_level) { |
| dev_dbg(di->dev, "Disabling scaled capacity\n"); |
| cs->enable = false; |
| capacity = di->bat_cap.prev_percent; |
| } else { |
| dev_dbg(di->dev, |
| "Waiting in cap to level %d%%\n", |
| cs->disable_cap_level); |
| capacity = cs->disable_cap_level; |
| } |
| } |
| } |
| |
| return capacity; |
| } |
| |
| /** |
| * ab8500_fg_update_cap_scalers() - Capacity scaling |
| * @di: pointer to the ab8500_fg structure |
| * |
| * To be called when state change from charge<->discharge to update |
| * the capacity scalers. |
| */ |
| static void ab8500_fg_update_cap_scalers(struct ab8500_fg *di) |
| { |
| struct ab8500_fg_cap_scaling *cs = &di->bat_cap.cap_scale; |
| |
| if (!cs->enable) |
| return; |
| if (di->flags.charging) { |
| di->bat_cap.cap_scale.disable_cap_level = |
| di->bat_cap.cap_scale.scaled_cap; |
| dev_dbg(di->dev, "Cap to stop scale at charge %d%%\n", |
| di->bat_cap.cap_scale.disable_cap_level); |
| } else { |
| if (cs->scaled_cap != 100) { |
| cs->cap_to_scale[0] = cs->scaled_cap; |
| cs->cap_to_scale[1] = di->bat_cap.prev_percent; |
| } else { |
| cs->cap_to_scale[0] = 100; |
| cs->cap_to_scale[1] = |
| max(di->bat_cap.prev_percent, |
| di->bm->fg_params->maint_thres); |
| } |
| |
| dev_dbg(di->dev, "Cap to scale at discharge %d/%d\n", |
| cs->cap_to_scale[0], cs->cap_to_scale[1]); |
| } |
| } |
| |
| /** |
| * ab8500_fg_check_capacity_limits() - Check if capacity has changed |
| * @di: pointer to the ab8500_fg structure |
| * @init: capacity is allowed to go up in init mode |
| * |
| * Check if capacity or capacity limit has changed and notify the system |
| * about it using the power_supply framework |
| */ |
| static void ab8500_fg_check_capacity_limits(struct ab8500_fg *di, bool init) |
| { |
| bool changed = false; |
| int percent = DIV_ROUND_CLOSEST(di->bat_cap.permille, 10); |
| |
| di->bat_cap.level = ab8500_fg_capacity_level(di); |
| |
| if (di->bat_cap.level != di->bat_cap.prev_level) { |
| /* |
| * We do not allow reported capacity level to go up |
| * unless we're charging or if we're in init |
| */ |
| if (!(!di->flags.charging && di->bat_cap.level > |
| di->bat_cap.prev_level) || init) { |
| dev_dbg(di->dev, "level changed from %d to %d\n", |
| di->bat_cap.prev_level, |
| di->bat_cap.level); |
| di->bat_cap.prev_level = di->bat_cap.level; |
| changed = true; |
| } else { |
| dev_dbg(di->dev, "level not allowed to go up " |
| "since no charger is connected: %d to %d\n", |
| di->bat_cap.prev_level, |
| di->bat_cap.level); |
| } |
| } |
| |
| /* |
| * If we have received the LOW_BAT IRQ, set capacity to 0 to initiate |
| * shutdown |
| */ |
| if (di->flags.low_bat) { |
| dev_dbg(di->dev, "Battery low, set capacity to 0\n"); |
| di->bat_cap.prev_percent = 0; |
| di->bat_cap.permille = 0; |
| percent = 0; |
| di->bat_cap.prev_mah = 0; |
| di->bat_cap.mah = 0; |
| changed = true; |
| } else if (di->flags.fully_charged) { |
| /* |
| * We report 100% if algorithm reported fully charged |
| * and show 100% during maintenance charging (scaling). |
| */ |
| if (di->flags.force_full) { |
| di->bat_cap.prev_percent = percent; |
| di->bat_cap.prev_mah = di->bat_cap.mah; |
| |
| changed = true; |
| |
| if (!di->bat_cap.cap_scale.enable && |
| di->bm->capacity_scaling) { |
| di->bat_cap.cap_scale.enable = true; |
| di->bat_cap.cap_scale.cap_to_scale[0] = 100; |
| di->bat_cap.cap_scale.cap_to_scale[1] = |
| di->bat_cap.prev_percent; |
| di->bat_cap.cap_scale.disable_cap_level = 100; |
| } |
| } else if (di->bat_cap.prev_percent != percent) { |
| dev_dbg(di->dev, |
| "battery reported full " |
| "but capacity dropping: %d\n", |
| percent); |
| di->bat_cap.prev_percent = percent; |
| di->bat_cap.prev_mah = di->bat_cap.mah; |
| |
| changed = true; |
| } |
| } else if (di->bat_cap.prev_percent != percent) { |
| if (percent == 0) { |
| /* |
| * We will not report 0% unless we've got |
| * the LOW_BAT IRQ, no matter what the FG |
| * algorithm says. |
| */ |
| di->bat_cap.prev_percent = 1; |
| percent = 1; |
| |
| changed = true; |
| } else if (!(!di->flags.charging && |
| percent > di->bat_cap.prev_percent) || init) { |
| /* |
| * We do not allow reported capacity to go up |
| * unless we're charging or if we're in init |
| */ |
| dev_dbg(di->dev, |
| "capacity changed from %d to %d (%d)\n", |
| di->bat_cap.prev_percent, |
| percent, |
| di->bat_cap.permille); |
| di->bat_cap.prev_percent = percent; |
| di->bat_cap.prev_mah = di->bat_cap.mah; |
| |
| changed = true; |
| } else { |
| dev_dbg(di->dev, "capacity not allowed to go up since " |
| "no charger is connected: %d to %d (%d)\n", |
| di->bat_cap.prev_percent, |
| percent, |
| di->bat_cap.permille); |
| } |
| } |
| |
| if (changed) { |
| if (di->bm->capacity_scaling) { |
| di->bat_cap.cap_scale.scaled_cap = |
| ab8500_fg_calculate_scaled_capacity(di); |
| |
| dev_info(di->dev, "capacity=%d (%d)\n", |
| di->bat_cap.prev_percent, |
| di->bat_cap.cap_scale.scaled_cap); |
| } |
| power_supply_changed(di->fg_psy); |
| if (di->flags.fully_charged && di->flags.force_full) { |
| dev_dbg(di->dev, "Battery full, notifying.\n"); |
| di->flags.force_full = false; |
| sysfs_notify(&di->fg_kobject, NULL, "charge_full"); |
| } |
| sysfs_notify(&di->fg_kobject, NULL, "charge_now"); |
| } |
| } |
| |
| static void ab8500_fg_charge_state_to(struct ab8500_fg *di, |
| enum ab8500_fg_charge_state new_state) |
| { |
| dev_dbg(di->dev, "Charge state from %d [%s] to %d [%s]\n", |
| di->charge_state, |
| charge_state[di->charge_state], |
| new_state, |
| charge_state[new_state]); |
| |
| di->charge_state = new_state; |
| } |
| |
| static void ab8500_fg_discharge_state_to(struct ab8500_fg *di, |
| enum ab8500_fg_discharge_state new_state) |
| { |
| dev_dbg(di->dev, "Discharge state from %d [%s] to %d [%s]\n", |
| di->discharge_state, |
| discharge_state[di->discharge_state], |
| new_state, |
| discharge_state[new_state]); |
| |
| di->discharge_state = new_state; |
| } |
| |
| /** |
| * ab8500_fg_algorithm_charging() - FG algorithm for when charging |
| * @di: pointer to the ab8500_fg structure |
| * |
| * Battery capacity calculation state machine for when we're charging |
| */ |
| static void ab8500_fg_algorithm_charging(struct ab8500_fg *di) |
| { |
| /* |
| * If we change to discharge mode |
| * we should start with recovery |
| */ |
| if (di->discharge_state != AB8500_FG_DISCHARGE_INIT_RECOVERY) |
| ab8500_fg_discharge_state_to(di, |
| AB8500_FG_DISCHARGE_INIT_RECOVERY); |
| |
| switch (di->charge_state) { |
| case AB8500_FG_CHARGE_INIT: |
| di->fg_samples = SEC_TO_SAMPLE( |
| di->bm->fg_params->accu_charging); |
| |
| ab8500_fg_coulomb_counter(di, true); |
| ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_READOUT); |
| |
| break; |
| |
| case AB8500_FG_CHARGE_READOUT: |
| /* |
| * Read the FG and calculate the new capacity |
| */ |
| mutex_lock(&di->cc_lock); |
| if (!di->flags.conv_done && !di->flags.force_full) { |
| /* Wasn't the CC IRQ that got us here */ |
| mutex_unlock(&di->cc_lock); |
| dev_dbg(di->dev, "%s CC conv not done\n", |
| __func__); |
| |
| break; |
| } |
| di->flags.conv_done = false; |
| mutex_unlock(&di->cc_lock); |
| |
| ab8500_fg_calc_cap_charging(di); |
| |
| break; |
| |
| default: |
| break; |
| } |
| |
| /* Check capacity limits */ |
| ab8500_fg_check_capacity_limits(di, false); |
| } |
| |
| static void force_capacity(struct ab8500_fg *di) |
| { |
| int cap; |
| |
| ab8500_fg_clear_cap_samples(di); |
| cap = di->bat_cap.user_mah; |
| if (cap > di->bat_cap.max_mah_design) { |
| dev_dbg(di->dev, "Remaining cap %d can't be bigger than total" |
| " %d\n", cap, di->bat_cap.max_mah_design); |
| cap = di->bat_cap.max_mah_design; |
| } |
| ab8500_fg_fill_cap_sample(di, di->bat_cap.user_mah); |
| di->bat_cap.permille = ab8500_fg_convert_mah_to_permille(di, cap); |
| di->bat_cap.mah = cap; |
| ab8500_fg_check_capacity_limits(di, true); |
| } |
| |
| static bool check_sysfs_capacity(struct ab8500_fg *di) |
| { |
| int cap, lower, upper; |
| int cap_permille; |
| |
| cap = di->bat_cap.user_mah; |
| |
| cap_permille = ab8500_fg_convert_mah_to_permille(di, |
| di->bat_cap.user_mah); |
| |
| lower = di->bat_cap.permille - di->bm->fg_params->user_cap_limit * 10; |
| upper = di->bat_cap.permille + di->bm->fg_params->user_cap_limit * 10; |
| |
| if (lower < 0) |
| lower = 0; |
| /* 1000 is permille, -> 100 percent */ |
| if (upper > 1000) |
| upper = 1000; |
| |
| dev_dbg(di->dev, "Capacity limits:" |
| " (Lower: %d User: %d Upper: %d) [user: %d, was: %d]\n", |
| lower, cap_permille, upper, cap, di->bat_cap.mah); |
| |
| /* If within limits, use the saved capacity and exit estimation...*/ |
| if (cap_permille > lower && cap_permille < upper) { |
| dev_dbg(di->dev, "OK! Using users cap %d uAh now\n", cap); |
| force_capacity(di); |
| return true; |
| } |
| dev_dbg(di->dev, "Capacity from user out of limits, ignoring"); |
| return false; |
| } |
| |
| /** |
| * ab8500_fg_algorithm_discharging() - FG algorithm for when discharging |
| * @di: pointer to the ab8500_fg structure |
| * |
| * Battery capacity calculation state machine for when we're discharging |
| */ |
| static void ab8500_fg_algorithm_discharging(struct ab8500_fg *di) |
| { |
| int sleep_time; |
| |
| /* If we change to charge mode we should start with init */ |
| if (di->charge_state != AB8500_FG_CHARGE_INIT) |
| ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT); |
| |
| switch (di->discharge_state) { |
| case AB8500_FG_DISCHARGE_INIT: |
| /* We use the FG IRQ to work on */ |
| di->init_cnt = 0; |
| di->fg_samples = SEC_TO_SAMPLE(di->bm->fg_params->init_timer); |
| ab8500_fg_coulomb_counter(di, true); |
| ab8500_fg_discharge_state_to(di, |
| AB8500_FG_DISCHARGE_INITMEASURING); |
| |
| /* Intentional fallthrough */ |
| case AB8500_FG_DISCHARGE_INITMEASURING: |
| /* |
| * Discard a number of samples during startup. |
| * After that, use compensated voltage for a few |
| * samples to get an initial capacity. |
| * Then go to READOUT |
| */ |
| sleep_time = di->bm->fg_params->init_timer; |
| |
| /* Discard the first [x] seconds */ |
| if (di->init_cnt > di->bm->fg_params->init_discard_time) { |
| ab8500_fg_calc_cap_discharge_voltage(di, true); |
| |
| ab8500_fg_check_capacity_limits(di, true); |
| } |
| |
| di->init_cnt += sleep_time; |
| if (di->init_cnt > di->bm->fg_params->init_total_time) |
| ab8500_fg_discharge_state_to(di, |
| AB8500_FG_DISCHARGE_READOUT_INIT); |
| |
| break; |
| |
| case AB8500_FG_DISCHARGE_INIT_RECOVERY: |
| di->recovery_cnt = 0; |
| di->recovery_needed = true; |
| ab8500_fg_discharge_state_to(di, |
| AB8500_FG_DISCHARGE_RECOVERY); |
| |
| /* Intentional fallthrough */ |
| |
| case AB8500_FG_DISCHARGE_RECOVERY: |
| sleep_time = di->bm->fg_params->recovery_sleep_timer; |
| |
| /* |
| * We should check the power consumption |
| * If low, go to READOUT (after x min) or |
| * RECOVERY_SLEEP if time left. |
| * If high, go to READOUT |
| */ |
| di->inst_curr = ab8500_fg_inst_curr_blocking(di); |
| |
| if (ab8500_fg_is_low_curr(di, di->inst_curr)) { |
| if (di->recovery_cnt > |
| di->bm->fg_params->recovery_total_time) { |
| di->fg_samples = SEC_TO_SAMPLE( |
| di->bm->fg_params->accu_high_curr); |
| ab8500_fg_coulomb_counter(di, true); |
| ab8500_fg_discharge_state_to(di, |
| AB8500_FG_DISCHARGE_READOUT); |
| di->recovery_needed = false; |
| } else { |
| queue_delayed_work(di->fg_wq, |
| &di->fg_periodic_work, |
| sleep_time * HZ); |
| } |
| di->recovery_cnt += sleep_time; |
| } else { |
| di->fg_samples = SEC_TO_SAMPLE( |
| di->bm->fg_params->accu_high_curr); |
| ab8500_fg_coulomb_counter(di, true); |
| ab8500_fg_discharge_state_to(di, |
| AB8500_FG_DISCHARGE_READOUT); |
| } |
| break; |
| |
| case AB8500_FG_DISCHARGE_READOUT_INIT: |
| di->fg_samples = SEC_TO_SAMPLE( |
| di->bm->fg_params->accu_high_curr); |
| ab8500_fg_coulomb_counter(di, true); |
| ab8500_fg_discharge_state_to(di, |
| AB8500_FG_DISCHARGE_READOUT); |
| break; |
| |
| case AB8500_FG_DISCHARGE_READOUT: |
| di->inst_curr = ab8500_fg_inst_curr_blocking(di); |
| |
| if (ab8500_fg_is_low_curr(di, di->inst_curr)) { |
| /* Detect mode change */ |
| if (di->high_curr_mode) { |
| di->high_curr_mode = false; |
| di->high_curr_cnt = 0; |
| } |
| |
| if (di->recovery_needed) { |
| ab8500_fg_discharge_state_to(di, |
| AB8500_FG_DISCHARGE_INIT_RECOVERY); |
| |
| queue_delayed_work(di->fg_wq, |
| &di->fg_periodic_work, 0); |
| |
| break; |
| } |
| |
| ab8500_fg_calc_cap_discharge_voltage(di, true); |
| } else { |
| mutex_lock(&di->cc_lock); |
| if (!di->flags.conv_done) { |
| /* Wasn't the CC IRQ that got us here */ |
| mutex_unlock(&di->cc_lock); |
| dev_dbg(di->dev, "%s CC conv not done\n", |
| __func__); |
| |
| break; |
| } |
| di->flags.conv_done = false; |
| mutex_unlock(&di->cc_lock); |
| |
| /* Detect mode change */ |
| if (!di->high_curr_mode) { |
| di->high_curr_mode = true; |
| di->high_curr_cnt = 0; |
| } |
| |
| di->high_curr_cnt += |
| di->bm->fg_params->accu_high_curr; |
| if (di->high_curr_cnt > |
| di->bm->fg_params->high_curr_time) |
| di->recovery_needed = true; |
| |
| ab8500_fg_calc_cap_discharge_fg(di); |
| } |
| |
| ab8500_fg_check_capacity_limits(di, false); |
| |
| break; |
| |
| case AB8500_FG_DISCHARGE_WAKEUP: |
| ab8500_fg_calc_cap_discharge_voltage(di, true); |
| |
| di->fg_samples = SEC_TO_SAMPLE( |
| di->bm->fg_params->accu_high_curr); |
| ab8500_fg_coulomb_counter(di, true); |
| ab8500_fg_discharge_state_to(di, |
| AB8500_FG_DISCHARGE_READOUT); |
| |
| ab8500_fg_check_capacity_limits(di, false); |
| |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| /** |
| * ab8500_fg_algorithm_calibrate() - Internal columb counter offset calibration |
| * @di: pointer to the ab8500_fg structure |
| * |
| */ |
| static void ab8500_fg_algorithm_calibrate(struct ab8500_fg *di) |
| { |
| int ret; |
| |
| switch (di->calib_state) { |
| case AB8500_FG_CALIB_INIT: |
| dev_dbg(di->dev, "Calibration ongoing...\n"); |
| |
| ret = abx500_mask_and_set_register_interruptible(di->dev, |
| AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, |
| CC_INT_CAL_N_AVG_MASK, CC_INT_CAL_SAMPLES_8); |
| if (ret < 0) |
| goto err; |
| |
| ret = abx500_mask_and_set_register_interruptible(di->dev, |
| AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, |
| CC_INTAVGOFFSET_ENA, CC_INTAVGOFFSET_ENA); |
| if (ret < 0) |
| goto err; |
| di->calib_state = AB8500_FG_CALIB_WAIT; |
| break; |
| case AB8500_FG_CALIB_END: |
| ret = abx500_mask_and_set_register_interruptible(di->dev, |
| AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, |
| CC_MUXOFFSET, CC_MUXOFFSET); |
| if (ret < 0) |
| goto err; |
| di->flags.calibrate = false; |
| dev_dbg(di->dev, "Calibration done...\n"); |
| queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); |
| break; |
| case AB8500_FG_CALIB_WAIT: |
| dev_dbg(di->dev, "Calibration WFI\n"); |
| default: |
| break; |
| } |
| return; |
| err: |
| /* Something went wrong, don't calibrate then */ |
| dev_err(di->dev, "failed to calibrate the CC\n"); |
| di->flags.calibrate = false; |
| di->calib_state = AB8500_FG_CALIB_INIT; |
| queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); |
| } |
| |
| /** |
| * ab8500_fg_algorithm() - Entry point for the FG algorithm |
| * @di: pointer to the ab8500_fg structure |
| * |
| * Entry point for the battery capacity calculation state machine |
| */ |
| static void ab8500_fg_algorithm(struct ab8500_fg *di) |
| { |
| if (di->flags.calibrate) |
| ab8500_fg_algorithm_calibrate(di); |
| else { |
| if (di->flags.charging) |
| ab8500_fg_algorithm_charging(di); |
| else |
| ab8500_fg_algorithm_discharging(di); |
| } |
| |
| dev_dbg(di->dev, "[FG_DATA] %d %d %d %d %d %d %d %d %d %d " |
| "%d %d %d %d %d %d %d\n", |
| di->bat_cap.max_mah_design, |
| di->bat_cap.max_mah, |
| di->bat_cap.mah, |
| di->bat_cap.permille, |
| di->bat_cap.level, |
| di->bat_cap.prev_mah, |
| di->bat_cap.prev_percent, |
| di->bat_cap.prev_level, |
| di->vbat, |
| di->inst_curr, |
| di->avg_curr, |
| di->accu_charge, |
| di->flags.charging, |
| di->charge_state, |
| di->discharge_state, |
| di->high_curr_mode, |
| di->recovery_needed); |
| } |
| |
| /** |
| * ab8500_fg_periodic_work() - Run the FG state machine periodically |
| * @work: pointer to the work_struct structure |
| * |
| * Work queue function for periodic work |
| */ |
| static void ab8500_fg_periodic_work(struct work_struct *work) |
| { |
| struct ab8500_fg *di = container_of(work, struct ab8500_fg, |
| fg_periodic_work.work); |
| |
| if (di->init_capacity) { |
| /* Get an initial capacity calculation */ |
| ab8500_fg_calc_cap_discharge_voltage(di, true); |
| ab8500_fg_check_capacity_limits(di, true); |
| di->init_capacity = false; |
| |
| queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); |
| } else if (di->flags.user_cap) { |
| if (check_sysfs_capacity(di)) { |
| ab8500_fg_check_capacity_limits(di, true); |
| if (di->flags.charging) |
| ab8500_fg_charge_state_to(di, |
| AB8500_FG_CHARGE_INIT); |
| else |
| ab8500_fg_discharge_state_to(di, |
| AB8500_FG_DISCHARGE_READOUT_INIT); |
| } |
| di->flags.user_cap = false; |
| queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); |
| } else |
| ab8500_fg_algorithm(di); |
| |
| } |
| |
| /** |
| * ab8500_fg_check_hw_failure_work() - Check OVV_BAT condition |
| * @work: pointer to the work_struct structure |
| * |
| * Work queue function for checking the OVV_BAT condition |
| */ |
| static void ab8500_fg_check_hw_failure_work(struct work_struct *work) |
| { |
| int ret; |
| u8 reg_value; |
| |
| struct ab8500_fg *di = container_of(work, struct ab8500_fg, |
| fg_check_hw_failure_work.work); |
| |
| /* |
| * If we have had a battery over-voltage situation, |
| * check ovv-bit to see if it should be reset. |
| */ |
| ret = abx500_get_register_interruptible(di->dev, |
| AB8500_CHARGER, AB8500_CH_STAT_REG, |
| ®_value); |
| if (ret < 0) { |
| dev_err(di->dev, "%s ab8500 read failed\n", __func__); |
| return; |
| } |
| if ((reg_value & BATT_OVV) == BATT_OVV) { |
| if (!di->flags.bat_ovv) { |
| dev_dbg(di->dev, "Battery OVV\n"); |
| di->flags.bat_ovv = true; |
| power_supply_changed(di->fg_psy); |
| } |
| /* Not yet recovered from ovv, reschedule this test */ |
| queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, |
| HZ); |
| } else { |
| dev_dbg(di->dev, "Battery recovered from OVV\n"); |
| di->flags.bat_ovv = false; |
| power_supply_changed(di->fg_psy); |
| } |
| } |
| |
| /** |
| * ab8500_fg_low_bat_work() - Check LOW_BAT condition |
| * @work: pointer to the work_struct structure |
| * |
| * Work queue function for checking the LOW_BAT condition |
| */ |
| static void ab8500_fg_low_bat_work(struct work_struct *work) |
| { |
| int vbat; |
| |
| struct ab8500_fg *di = container_of(work, struct ab8500_fg, |
| fg_low_bat_work.work); |
| |
| vbat = ab8500_fg_bat_voltage(di); |
| |
| /* Check if LOW_BAT still fulfilled */ |
| if (vbat < di->bm->fg_params->lowbat_threshold) { |
| /* Is it time to shut down? */ |
| if (di->low_bat_cnt < 1) { |
| di->flags.low_bat = true; |
| dev_warn(di->dev, "Shut down pending...\n"); |
| } else { |
| /* |
| * Else we need to re-schedule this check to be able to detect |
| * if the voltage increases again during charging or |
| * due to decreasing load. |
| */ |
| di->low_bat_cnt--; |
| dev_warn(di->dev, "Battery voltage still LOW\n"); |
| queue_delayed_work(di->fg_wq, &di->fg_low_bat_work, |
| round_jiffies(LOW_BAT_CHECK_INTERVAL)); |
| } |
| } else { |
| di->flags.low_bat_delay = false; |
| di->low_bat_cnt = 10; |
| dev_warn(di->dev, "Battery voltage OK again\n"); |
| } |
| |
| /* This is needed to dispatch LOW_BAT */ |
| ab8500_fg_check_capacity_limits(di, false); |
| } |
| |
| /** |
| * ab8500_fg_battok_calc - calculate the bit pattern corresponding |
| * to the target voltage. |
| * @di: pointer to the ab8500_fg structure |
| * @target: target voltage |
| * |
| * Returns bit pattern closest to the target voltage |
| * valid return values are 0-14. (0-BATT_OK_MAX_NR_INCREMENTS) |
| */ |
| |
| static int ab8500_fg_battok_calc(struct ab8500_fg *di, int target) |
| { |
| if (target > BATT_OK_MIN + |
| (BATT_OK_INCREMENT * BATT_OK_MAX_NR_INCREMENTS)) |
| return BATT_OK_MAX_NR_INCREMENTS; |
| if (target < BATT_OK_MIN) |
| return 0; |
| return (target - BATT_OK_MIN) / BATT_OK_INCREMENT; |
| } |
| |
| /** |
| * ab8500_fg_battok_init_hw_register - init battok levels |
| * @di: pointer to the ab8500_fg structure |
| * |
| */ |
| |
| static int ab8500_fg_battok_init_hw_register(struct ab8500_fg *di) |
| { |
| int selected; |
| int sel0; |
| int sel1; |
| int cbp_sel0; |
| int cbp_sel1; |
| int ret; |
| int new_val; |
| |
| sel0 = di->bm->fg_params->battok_falling_th_sel0; |
| sel1 = di->bm->fg_params->battok_raising_th_sel1; |
| |
| cbp_sel0 = ab8500_fg_battok_calc(di, sel0); |
| cbp_sel1 = ab8500_fg_battok_calc(di, sel1); |
| |
| selected = BATT_OK_MIN + cbp_sel0 * BATT_OK_INCREMENT; |
| |
| if (selected != sel0) |
| dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n", |
| sel0, selected, cbp_sel0); |
| |
| selected = BATT_OK_MIN + cbp_sel1 * BATT_OK_INCREMENT; |
| |
| if (selected != sel1) |
| dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n", |
| sel1, selected, cbp_sel1); |
| |
| new_val = cbp_sel0 | (cbp_sel1 << 4); |
| |
| dev_dbg(di->dev, "using: %x %d %d\n", new_val, cbp_sel0, cbp_sel1); |
| ret = abx500_set_register_interruptible(di->dev, AB8500_SYS_CTRL2_BLOCK, |
| AB8500_BATT_OK_REG, new_val); |
| return ret; |
| } |
| |
| /** |
| * ab8500_fg_instant_work() - Run the FG state machine instantly |
| * @work: pointer to the work_struct structure |
| * |
| * Work queue function for instant work |
| */ |
| static void ab8500_fg_instant_work(struct work_struct *work) |
| { |
| struct ab8500_fg *di = container_of(work, struct ab8500_fg, fg_work); |
| |
| ab8500_fg_algorithm(di); |
| } |
| |
| /** |
| * ab8500_fg_cc_data_end_handler() - end of data conversion isr. |
| * @irq: interrupt number |
| * @_di: pointer to the ab8500_fg structure |
| * |
| * Returns IRQ status(IRQ_HANDLED) |
| */ |
| static irqreturn_t ab8500_fg_cc_data_end_handler(int irq, void *_di) |
| { |
| struct ab8500_fg *di = _di; |
| if (!di->nbr_cceoc_irq_cnt) { |
| di->nbr_cceoc_irq_cnt++; |
| complete(&di->ab8500_fg_started); |
| } else { |
| di->nbr_cceoc_irq_cnt = 0; |
| complete(&di->ab8500_fg_complete); |
| } |
| return IRQ_HANDLED; |
| } |
| |
| /** |
| * ab8500_fg_cc_int_calib_handler () - end of calibration isr. |
| * @irq: interrupt number |
| * @_di: pointer to the ab8500_fg structure |
| * |
| * Returns IRQ status(IRQ_HANDLED) |
| */ |
| static irqreturn_t ab8500_fg_cc_int_calib_handler(int irq, void *_di) |
| { |
| struct ab8500_fg *di = _di; |
| di->calib_state = AB8500_FG_CALIB_END; |
| queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); |
| return IRQ_HANDLED; |
| } |
| |
| /** |
| * ab8500_fg_cc_convend_handler() - isr to get battery avg current. |
| * @irq: interrupt number |
| * @_di: pointer to the ab8500_fg structure |
| * |
| * Returns IRQ status(IRQ_HANDLED) |
| */ |
| static irqreturn_t ab8500_fg_cc_convend_handler(int irq, void *_di) |
| { |
| struct ab8500_fg *di = _di; |
| |
| queue_work(di->fg_wq, &di->fg_acc_cur_work); |
| |
| return IRQ_HANDLED; |
| } |
| |
| /** |
| * ab8500_fg_batt_ovv_handler() - Battery OVV occured |
| * @irq: interrupt number |
| * @_di: pointer to the ab8500_fg structure |
| * |
| * Returns IRQ status(IRQ_HANDLED) |
| */ |
| static irqreturn_t ab8500_fg_batt_ovv_handler(int irq, void *_di) |
| { |
| struct ab8500_fg *di = _di; |
| |
| dev_dbg(di->dev, "Battery OVV\n"); |
| |
| /* Schedule a new HW failure check */ |
| queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, 0); |
| |
| return IRQ_HANDLED; |
| } |
| |
| /** |
| * ab8500_fg_lowbatf_handler() - Battery voltage is below LOW threshold |
| * @irq: interrupt number |
| * @_di: pointer to the ab8500_fg structure |
| * |
| * Returns IRQ status(IRQ_HANDLED) |
| */ |
| static irqreturn_t ab8500_fg_lowbatf_handler(int irq, void *_di) |
| { |
| struct ab8500_fg *di = _di; |
| |
| /* Initiate handling in ab8500_fg_low_bat_work() if not already initiated. */ |
| if (!di->flags.low_bat_delay) { |
| dev_warn(di->dev, "Battery voltage is below LOW threshold\n"); |
| di->flags.low_bat_delay = true; |
| /* |
| * Start a timer to check LOW_BAT again after some time |
| * This is done to avoid shutdown on single voltage dips |
| */ |
| queue_delayed_work(di->fg_wq, &di->fg_low_bat_work, |
| round_jiffies(LOW_BAT_CHECK_INTERVAL)); |
| } |
| return IRQ_HANDLED; |
| } |
| |
| /** |
| * ab8500_fg_get_property() - get the fg properties |
| * @psy: pointer to the power_supply structure |
| * @psp: pointer to the power_supply_property structure |
| * @val: pointer to the power_supply_propval union |
| * |
| * This function gets called when an application tries to get the |
| * fg properties by reading the sysfs files. |
| * voltage_now: battery voltage |
| * current_now: battery instant current |
| * current_avg: battery average current |
| * charge_full_design: capacity where battery is considered full |
| * charge_now: battery capacity in nAh |
| * capacity: capacity in percent |
| * capacity_level: capacity level |
| * |
| * Returns error code in case of failure else 0 on success |
| */ |
| static int ab8500_fg_get_property(struct power_supply *psy, |
| enum power_supply_property psp, |
| union power_supply_propval *val) |
| { |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| /* |
| * If battery is identified as unknown and charging of unknown |
| * batteries is disabled, we always report 100% capacity and |
| * capacity level UNKNOWN, since we can't calculate |
| * remaining capacity |
| */ |
| |
| switch (psp) { |
| case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
| if (di->flags.bat_ovv) |
| val->intval = BATT_OVV_VALUE * 1000; |
| else |
| val->intval = di->vbat * 1000; |
| break; |
| case POWER_SUPPLY_PROP_CURRENT_NOW: |
| val->intval = di->inst_curr * 1000; |
| break; |
| case POWER_SUPPLY_PROP_CURRENT_AVG: |
| val->intval = di->avg_curr * 1000; |
| break; |
| case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: |
| val->intval = ab8500_fg_convert_mah_to_uwh(di, |
| di->bat_cap.max_mah_design); |
| break; |
| case POWER_SUPPLY_PROP_ENERGY_FULL: |
| val->intval = ab8500_fg_convert_mah_to_uwh(di, |
| di->bat_cap.max_mah); |
| break; |
| case POWER_SUPPLY_PROP_ENERGY_NOW: |
| if (di->flags.batt_unknown && !di->bm->chg_unknown_bat && |
| di->flags.batt_id_received) |
| val->intval = ab8500_fg_convert_mah_to_uwh(di, |
| di->bat_cap.max_mah); |
| else |
| val->intval = ab8500_fg_convert_mah_to_uwh(di, |
| di->bat_cap.prev_mah); |
| break; |
| case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: |
| val->intval = di->bat_cap.max_mah_design; |
| break; |
| case POWER_SUPPLY_PROP_CHARGE_FULL: |
| val->intval = di->bat_cap.max_mah; |
| break; |
| case POWER_SUPPLY_PROP_CHARGE_NOW: |
| if (di->flags.batt_unknown && !di->bm->chg_unknown_bat && |
| di->flags.batt_id_received) |
| val->intval = di->bat_cap.max_mah; |
| else |
| val->intval = di->bat_cap.prev_mah; |
| break; |
| case POWER_SUPPLY_PROP_CAPACITY: |
| if (di->flags.batt_unknown && !di->bm->chg_unknown_bat && |
| di->flags.batt_id_received) |
| val->intval = 100; |
| else |
| val->intval = di->bat_cap.prev_percent; |
| break; |
| case POWER_SUPPLY_PROP_CAPACITY_LEVEL: |
| if (di->flags.batt_unknown && !di->bm->chg_unknown_bat && |
| di->flags.batt_id_received) |
| val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN; |
| else |
| val->intval = di->bat_cap.prev_level; |
| break; |
| default: |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data) |
| { |
| struct power_supply *psy; |
| struct power_supply *ext = dev_get_drvdata(dev); |
| const char **supplicants = (const char **)ext->supplied_to; |
| struct ab8500_fg *di; |
| union power_supply_propval ret; |
| int j; |
| |
| psy = (struct power_supply *)data; |
| di = power_supply_get_drvdata(psy); |
| |
| /* |
| * For all psy where the name of your driver |
| * appears in any supplied_to |
| */ |
| j = match_string(supplicants, ext->num_supplicants, psy->desc->name); |
| if (j < 0) |
| return 0; |
| |
| /* Go through all properties for the psy */ |
| for (j = 0; j < ext->desc->num_properties; j++) { |
| enum power_supply_property prop; |
| prop = ext->desc->properties[j]; |
| |
| if (power_supply_get_property(ext, prop, &ret)) |
| continue; |
| |
| switch (prop) { |
| case POWER_SUPPLY_PROP_STATUS: |
| switch (ext->desc->type) { |
| case POWER_SUPPLY_TYPE_BATTERY: |
| switch (ret.intval) { |
| case POWER_SUPPLY_STATUS_UNKNOWN: |
| case POWER_SUPPLY_STATUS_DISCHARGING: |
| case POWER_SUPPLY_STATUS_NOT_CHARGING: |
| if (!di->flags.charging) |
| break; |
| di->flags.charging = false; |
| di->flags.fully_charged = false; |
| if (di->bm->capacity_scaling) |
| ab8500_fg_update_cap_scalers(di); |
| queue_work(di->fg_wq, &di->fg_work); |
| break; |
| case POWER_SUPPLY_STATUS_FULL: |
| if (di->flags.fully_charged) |
| break; |
| di->flags.fully_charged = true; |
| di->flags.force_full = true; |
| /* Save current capacity as maximum */ |
| di->bat_cap.max_mah = di->bat_cap.mah; |
| queue_work(di->fg_wq, &di->fg_work); |
| break; |
| case POWER_SUPPLY_STATUS_CHARGING: |
| if (di->flags.charging && |
| !di->flags.fully_charged) |
| break; |
| di->flags.charging = true; |
| di->flags.fully_charged = false; |
| if (di->bm->capacity_scaling) |
| ab8500_fg_update_cap_scalers(di); |
| queue_work(di->fg_wq, &di->fg_work); |
| break; |
| } |
| default: |
| break; |
| } |
| break; |
| case POWER_SUPPLY_PROP_TECHNOLOGY: |
| switch (ext->desc->type) { |
| case POWER_SUPPLY_TYPE_BATTERY: |
| if (!di->flags.batt_id_received && |
| di->bm->batt_id != BATTERY_UNKNOWN) { |
| const struct abx500_battery_type *b; |
| |
| b = &(di->bm->bat_type[di->bm->batt_id]); |
| |
| di->flags.batt_id_received = true; |
| |
| di->bat_cap.max_mah_design = |
| MILLI_TO_MICRO * |
| b->charge_full_design; |
| |
| di->bat_cap.max_mah = |
| di->bat_cap.max_mah_design; |
| |
| di->vbat_nom = b->nominal_voltage; |
| } |
| |
| if (ret.intval) |
| di->flags.batt_unknown = false; |
| else |
| di->flags.batt_unknown = true; |
| break; |
| default: |
| break; |
| } |
| break; |
| case POWER_SUPPLY_PROP_TEMP: |
| switch (ext->desc->type) { |
| case POWER_SUPPLY_TYPE_BATTERY: |
| if (di->flags.batt_id_received) |
| di->bat_temp = ret.intval; |
| break; |
| default: |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| return 0; |
| } |
| |
| /** |
| * ab8500_fg_init_hw_registers() - Set up FG related registers |
| * @di: pointer to the ab8500_fg structure |
| * |
| * Set up battery OVV, low battery voltage registers |
| */ |
| static int ab8500_fg_init_hw_registers(struct ab8500_fg *di) |
| { |
| int ret; |
| |
| /* Set VBAT OVV threshold */ |
| ret = abx500_mask_and_set_register_interruptible(di->dev, |
| AB8500_CHARGER, |
| AB8500_BATT_OVV, |
| BATT_OVV_TH_4P75, |
| BATT_OVV_TH_4P75); |
| if (ret) { |
| dev_err(di->dev, "failed to set BATT_OVV\n"); |
| goto out; |
| } |
| |
| /* Enable VBAT OVV detection */ |
| ret = abx500_mask_and_set_register_interruptible(di->dev, |
| AB8500_CHARGER, |
| AB8500_BATT_OVV, |
| BATT_OVV_ENA, |
| BATT_OVV_ENA); |
| if (ret) { |
| dev_err(di->dev, "failed to enable BATT_OVV\n"); |
| goto out; |
| } |
| |
| /* Low Battery Voltage */ |
| ret = abx500_set_register_interruptible(di->dev, |
| AB8500_SYS_CTRL2_BLOCK, |
| AB8500_LOW_BAT_REG, |
| ab8500_volt_to_regval( |
| di->bm->fg_params->lowbat_threshold) << 1 | |
| LOW_BAT_ENABLE); |
| if (ret) { |
| dev_err(di->dev, "%s write failed\n", __func__); |
| goto out; |
| } |
| |
| /* Battery OK threshold */ |
| ret = ab8500_fg_battok_init_hw_register(di); |
| if (ret) { |
| dev_err(di->dev, "BattOk init write failed.\n"); |
| goto out; |
| } |
| |
| if (is_ab8505(di->parent)) { |
| ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_MAX_TIME_REG, di->bm->fg_params->pcut_max_time); |
| |
| if (ret) { |
| dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_MAX_TIME_REG\n", __func__); |
| goto out; |
| } |
| |
| ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_FLAG_TIME_REG, di->bm->fg_params->pcut_flag_time); |
| |
| if (ret) { |
| dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_FLAG_TIME_REG\n", __func__); |
| goto out; |
| } |
| |
| ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_RESTART_REG, di->bm->fg_params->pcut_max_restart); |
| |
| if (ret) { |
| dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_RESTART_REG\n", __func__); |
| goto out; |
| } |
| |
| ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_DEBOUNCE_REG, di->bm->fg_params->pcut_debounce_time); |
| |
| if (ret) { |
| dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_DEBOUNCE_REG\n", __func__); |
| goto out; |
| } |
| |
| ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_CTL_STATUS_REG, di->bm->fg_params->pcut_enable); |
| |
| if (ret) { |
| dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_CTL_STATUS_REG\n", __func__); |
| goto out; |
| } |
| } |
| out: |
| return ret; |
| } |
| |
| /** |
| * ab8500_fg_external_power_changed() - callback for power supply changes |
| * @psy: pointer to the structure power_supply |
| * |
| * This function is the entry point of the pointer external_power_changed |
| * of the structure power_supply. |
| * This function gets executed when there is a change in any external power |
| * supply that this driver needs to be notified of. |
| */ |
| static void ab8500_fg_external_power_changed(struct power_supply *psy) |
| { |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| class_for_each_device(power_supply_class, NULL, |
| di->fg_psy, ab8500_fg_get_ext_psy_data); |
| } |
| |
| /** |
| * ab8500_fg_reinit_work() - work to reset the FG algorithm |
| * @work: pointer to the work_struct structure |
| * |
| * Used to reset the current battery capacity to be able to |
| * retrigger a new voltage base capacity calculation. For |
| * test and verification purpose. |
| */ |
| static void ab8500_fg_reinit_work(struct work_struct *work) |
| { |
| struct ab8500_fg *di = container_of(work, struct ab8500_fg, |
| fg_reinit_work.work); |
| |
| if (di->flags.calibrate == false) { |
| dev_dbg(di->dev, "Resetting FG state machine to init.\n"); |
| ab8500_fg_clear_cap_samples(di); |
| ab8500_fg_calc_cap_discharge_voltage(di, true); |
| ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT); |
| ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT); |
| queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); |
| |
| } else { |
| dev_err(di->dev, "Residual offset calibration ongoing " |
| "retrying..\n"); |
| /* Wait one second until next try*/ |
| queue_delayed_work(di->fg_wq, &di->fg_reinit_work, |
| round_jiffies(1)); |
| } |
| } |
| |
| /* Exposure to the sysfs interface */ |
| |
| struct ab8500_fg_sysfs_entry { |
| struct attribute attr; |
| ssize_t (*show)(struct ab8500_fg *, char *); |
| ssize_t (*store)(struct ab8500_fg *, const char *, size_t); |
| }; |
| |
| static ssize_t charge_full_show(struct ab8500_fg *di, char *buf) |
| { |
| return sprintf(buf, "%d\n", di->bat_cap.max_mah); |
| } |
| |
| static ssize_t charge_full_store(struct ab8500_fg *di, const char *buf, |
| size_t count) |
| { |
| unsigned long charge_full; |
| int ret; |
| |
| ret = kstrtoul(buf, 10, &charge_full); |
| if (ret) |
| return ret; |
| |
| di->bat_cap.max_mah = (int) charge_full; |
| return count; |
| } |
| |
| static ssize_t charge_now_show(struct ab8500_fg *di, char *buf) |
| { |
| return sprintf(buf, "%d\n", di->bat_cap.prev_mah); |
| } |
| |
| static ssize_t charge_now_store(struct ab8500_fg *di, const char *buf, |
| size_t count) |
| { |
| unsigned long charge_now; |
| int ret; |
| |
| ret = kstrtoul(buf, 10, &charge_now); |
| if (ret) |
| return ret; |
| |
| di->bat_cap.user_mah = (int) charge_now; |
| di->flags.user_cap = true; |
| queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); |
| return count; |
| } |
| |
| static struct ab8500_fg_sysfs_entry charge_full_attr = |
| __ATTR(charge_full, 0644, charge_full_show, charge_full_store); |
| |
| static struct ab8500_fg_sysfs_entry charge_now_attr = |
| __ATTR(charge_now, 0644, charge_now_show, charge_now_store); |
| |
| static ssize_t |
| ab8500_fg_show(struct kobject *kobj, struct attribute *attr, char *buf) |
| { |
| struct ab8500_fg_sysfs_entry *entry; |
| struct ab8500_fg *di; |
| |
| entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr); |
| di = container_of(kobj, struct ab8500_fg, fg_kobject); |
| |
| if (!entry->show) |
| return -EIO; |
| |
| return entry->show(di, buf); |
| } |
| static ssize_t |
| ab8500_fg_store(struct kobject *kobj, struct attribute *attr, const char *buf, |
| size_t count) |
| { |
| struct ab8500_fg_sysfs_entry *entry; |
| struct ab8500_fg *di; |
| |
| entry = container_of(attr, struct ab8500_fg_sysfs_entry, attr); |
| di = container_of(kobj, struct ab8500_fg, fg_kobject); |
| |
| if (!entry->store) |
| return -EIO; |
| |
| return entry->store(di, buf, count); |
| } |
| |
| static const struct sysfs_ops ab8500_fg_sysfs_ops = { |
| .show = ab8500_fg_show, |
| .store = ab8500_fg_store, |
| }; |
| |
| static struct attribute *ab8500_fg_attrs[] = { |
| &charge_full_attr.attr, |
| &charge_now_attr.attr, |
| NULL, |
| }; |
| |
| static struct kobj_type ab8500_fg_ktype = { |
| .sysfs_ops = &ab8500_fg_sysfs_ops, |
| .default_attrs = ab8500_fg_attrs, |
| }; |
| |
| /** |
| * ab8500_fg_sysfs_exit() - de-init of sysfs entry |
| * @di: pointer to the struct ab8500_chargalg |
| * |
| * This function removes the entry in sysfs. |
| */ |
| static void ab8500_fg_sysfs_exit(struct ab8500_fg *di) |
| { |
| kobject_del(&di->fg_kobject); |
| } |
| |
| /** |
| * ab8500_fg_sysfs_init() - init of sysfs entry |
| * @di: pointer to the struct ab8500_chargalg |
| * |
| * This function adds an entry in sysfs. |
| * Returns error code in case of failure else 0(on success) |
| */ |
| static int ab8500_fg_sysfs_init(struct ab8500_fg *di) |
| { |
| int ret = 0; |
| |
| ret = kobject_init_and_add(&di->fg_kobject, |
| &ab8500_fg_ktype, |
| NULL, "battery"); |
| if (ret < 0) |
| dev_err(di->dev, "failed to create sysfs entry\n"); |
| |
| return ret; |
| } |
| |
| static ssize_t ab8505_powercut_flagtime_read(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| int ret; |
| u8 reg_value; |
| struct power_supply *psy = dev_get_drvdata(dev); |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_FLAG_TIME_REG, ®_value); |
| |
| if (ret < 0) { |
| dev_err(dev, "Failed to read AB8505_RTC_PCUT_FLAG_TIME_REG\n"); |
| goto fail; |
| } |
| |
| return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F)); |
| |
| fail: |
| return ret; |
| } |
| |
| static ssize_t ab8505_powercut_flagtime_write(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| int ret; |
| int reg_value; |
| struct power_supply *psy = dev_get_drvdata(dev); |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| if (kstrtoint(buf, 10, ®_value)) |
| goto fail; |
| |
| if (reg_value > 0x7F) { |
| dev_err(dev, "Incorrect parameter, echo 0 (1.98s) - 127 (15.625ms) for flagtime\n"); |
| goto fail; |
| } |
| |
| ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_FLAG_TIME_REG, (u8)reg_value); |
| |
| if (ret < 0) |
| dev_err(dev, "Failed to set AB8505_RTC_PCUT_FLAG_TIME_REG\n"); |
| |
| fail: |
| return count; |
| } |
| |
| static ssize_t ab8505_powercut_maxtime_read(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| int ret; |
| u8 reg_value; |
| struct power_supply *psy = dev_get_drvdata(dev); |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_MAX_TIME_REG, ®_value); |
| |
| if (ret < 0) { |
| dev_err(dev, "Failed to read AB8505_RTC_PCUT_MAX_TIME_REG\n"); |
| goto fail; |
| } |
| |
| return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F)); |
| |
| fail: |
| return ret; |
| |
| } |
| |
| static ssize_t ab8505_powercut_maxtime_write(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| int ret; |
| int reg_value; |
| struct power_supply *psy = dev_get_drvdata(dev); |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| if (kstrtoint(buf, 10, ®_value)) |
| goto fail; |
| |
| if (reg_value > 0x7F) { |
| dev_err(dev, "Incorrect parameter, echo 0 (0.0s) - 127 (1.98s) for maxtime\n"); |
| goto fail; |
| } |
| |
| ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_MAX_TIME_REG, (u8)reg_value); |
| |
| if (ret < 0) |
| dev_err(dev, "Failed to set AB8505_RTC_PCUT_MAX_TIME_REG\n"); |
| |
| fail: |
| return count; |
| } |
| |
| static ssize_t ab8505_powercut_restart_read(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| int ret; |
| u8 reg_value; |
| struct power_supply *psy = dev_get_drvdata(dev); |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_RESTART_REG, ®_value); |
| |
| if (ret < 0) { |
| dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n"); |
| goto fail; |
| } |
| |
| return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0xF)); |
| |
| fail: |
| return ret; |
| } |
| |
| static ssize_t ab8505_powercut_restart_write(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| int ret; |
| int reg_value; |
| struct power_supply *psy = dev_get_drvdata(dev); |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| if (kstrtoint(buf, 10, ®_value)) |
| goto fail; |
| |
| if (reg_value > 0xF) { |
| dev_err(dev, "Incorrect parameter, echo 0 - 15 for number of restart\n"); |
| goto fail; |
| } |
| |
| ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_RESTART_REG, (u8)reg_value); |
| |
| if (ret < 0) |
| dev_err(dev, "Failed to set AB8505_RTC_PCUT_RESTART_REG\n"); |
| |
| fail: |
| return count; |
| |
| } |
| |
| static ssize_t ab8505_powercut_timer_read(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| int ret; |
| u8 reg_value; |
| struct power_supply *psy = dev_get_drvdata(dev); |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_TIME_REG, ®_value); |
| |
| if (ret < 0) { |
| dev_err(dev, "Failed to read AB8505_RTC_PCUT_TIME_REG\n"); |
| goto fail; |
| } |
| |
| return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F)); |
| |
| fail: |
| return ret; |
| } |
| |
| static ssize_t ab8505_powercut_restart_counter_read(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| int ret; |
| u8 reg_value; |
| struct power_supply *psy = dev_get_drvdata(dev); |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_RESTART_REG, ®_value); |
| |
| if (ret < 0) { |
| dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n"); |
| goto fail; |
| } |
| |
| return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0xF0) >> 4); |
| |
| fail: |
| return ret; |
| } |
| |
| static ssize_t ab8505_powercut_read(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| int ret; |
| u8 reg_value; |
| struct power_supply *psy = dev_get_drvdata(dev); |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value); |
| |
| if (ret < 0) |
| goto fail; |
| |
| return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x1)); |
| |
| fail: |
| return ret; |
| } |
| |
| static ssize_t ab8505_powercut_write(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| int ret; |
| int reg_value; |
| struct power_supply *psy = dev_get_drvdata(dev); |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| if (kstrtoint(buf, 10, ®_value)) |
| goto fail; |
| |
| if (reg_value > 0x1) { |
| dev_err(dev, "Incorrect parameter, echo 0/1 to disable/enable Pcut feature\n"); |
| goto fail; |
| } |
| |
| ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_CTL_STATUS_REG, (u8)reg_value); |
| |
| if (ret < 0) |
| dev_err(dev, "Failed to set AB8505_RTC_PCUT_CTL_STATUS_REG\n"); |
| |
| fail: |
| return count; |
| } |
| |
| static ssize_t ab8505_powercut_flag_read(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| |
| int ret; |
| u8 reg_value; |
| struct power_supply *psy = dev_get_drvdata(dev); |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value); |
| |
| if (ret < 0) { |
| dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n"); |
| goto fail; |
| } |
| |
| return scnprintf(buf, PAGE_SIZE, "%d\n", ((reg_value & 0x10) >> 4)); |
| |
| fail: |
| return ret; |
| } |
| |
| static ssize_t ab8505_powercut_debounce_read(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| int ret; |
| u8 reg_value; |
| struct power_supply *psy = dev_get_drvdata(dev); |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_DEBOUNCE_REG, ®_value); |
| |
| if (ret < 0) { |
| dev_err(dev, "Failed to read AB8505_RTC_PCUT_DEBOUNCE_REG\n"); |
| goto fail; |
| } |
| |
| return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7)); |
| |
| fail: |
| return ret; |
| } |
| |
| static ssize_t ab8505_powercut_debounce_write(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| int ret; |
| int reg_value; |
| struct power_supply *psy = dev_get_drvdata(dev); |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| if (kstrtoint(buf, 10, ®_value)) |
| goto fail; |
| |
| if (reg_value > 0x7) { |
| dev_err(dev, "Incorrect parameter, echo 0 to 7 for debounce setting\n"); |
| goto fail; |
| } |
| |
| ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_DEBOUNCE_REG, (u8)reg_value); |
| |
| if (ret < 0) |
| dev_err(dev, "Failed to set AB8505_RTC_PCUT_DEBOUNCE_REG\n"); |
| |
| fail: |
| return count; |
| } |
| |
| static ssize_t ab8505_powercut_enable_status_read(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| int ret; |
| u8 reg_value; |
| struct power_supply *psy = dev_get_drvdata(dev); |
| struct ab8500_fg *di = power_supply_get_drvdata(psy); |
| |
| ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, |
| AB8505_RTC_PCUT_CTL_STATUS_REG, ®_value); |
| |
| if (ret < 0) { |
| dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n"); |
| goto fail; |
| } |
| |
| return scnprintf(buf, PAGE_SIZE, "%d\n", ((reg_value & 0x20) >> 5)); |
| |
| fail: |
| return ret; |
| } |
| |
| static struct device_attribute ab8505_fg_sysfs_psy_attrs[] = { |
| __ATTR(powercut_flagtime, (S_IRUGO | S_IWUSR | S_IWGRP), |
| ab8505_powercut_flagtime_read, ab8505_powercut_flagtime_write), |
| __ATTR(powercut_maxtime, (S_IRUGO | S_IWUSR | S_IWGRP), |
| ab8505_powercut_maxtime_read, ab8505_powercut_maxtime_write), |
| __ATTR(powercut_restart_max, (S_IRUGO | S_IWUSR | S_IWGRP), |
| ab8505_powercut_restart_read, ab8505_powercut_restart_write), |
| __ATTR(powercut_timer, S_IRUGO, ab8505_powercut_timer_read, NULL), |
| __ATTR(powercut_restart_counter, S_IRUGO, |
| ab8505_powercut_restart_counter_read, NULL), |
| __ATTR(powercut_enable, (S_IRUGO | S_IWUSR | S_IWGRP), |
| ab8505_powercut_read, ab8505_powercut_write), |
| __ATTR(powercut_flag, S_IRUGO, ab8505_powercut_flag_read, NULL), |
| __ATTR(powercut_debounce_time, (S_IRUGO | S_IWUSR | S_IWGRP), |
| ab8505_powercut_debounce_read, ab8505_powercut_debounce_write), |
| __ATTR(powercut_enable_status, S_IRUGO, |
| ab8505_powercut_enable_status_read, NULL), |
| }; |
| |
| static int ab8500_fg_sysfs_psy_create_attrs(struct ab8500_fg *di) |
| { |
| unsigned int i; |
| |
| if (is_ab8505(di->parent)) { |
| for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++) |
| if (device_create_file(&di->fg_psy->dev, |
| &ab8505_fg_sysfs_psy_attrs[i])) |
| goto sysfs_psy_create_attrs_failed_ab8505; |
| } |
| return 0; |
| sysfs_psy_create_attrs_failed_ab8505: |
| dev_err(&di->fg_psy->dev, "Failed creating sysfs psy attrs for ab8505.\n"); |
| while (i--) |
| device_remove_file(&di->fg_psy->dev, |
| &ab8505_fg_sysfs_psy_attrs[i]); |
| |
| return -EIO; |
| } |
| |
| static void ab8500_fg_sysfs_psy_remove_attrs(struct ab8500_fg *di) |
| { |
| unsigned int i; |
| |
| if (is_ab8505(di->parent)) { |
| for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++) |
| (void)device_remove_file(&di->fg_psy->dev, |
| &ab8505_fg_sysfs_psy_attrs[i]); |
| } |
| } |
| |
| /* Exposure to the sysfs interface <<END>> */ |
| |
| #if defined(CONFIG_PM) |
| static int ab8500_fg_resume(struct platform_device *pdev) |
| { |
| struct ab8500_fg *di = platform_get_drvdata(pdev); |
| |
| /* |
| * Change state if we're not charging. If we're charging we will wake |
| * up on the FG IRQ |
| */ |
| if (!di->flags.charging) { |
| ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_WAKEUP); |
| queue_work(di->fg_wq, &di->fg_work); |
| } |
| |
| return 0; |
| } |
| |
| static int ab8500_fg_suspend(struct platform_device *pdev, |
| pm_message_t state) |
| { |
| struct ab8500_fg *di = platform_get_drvdata(pdev); |
| |
| flush_delayed_work(&di->fg_periodic_work); |
| flush_work(&di->fg_work); |
| flush_work(&di->fg_acc_cur_work); |
| flush_delayed_work(&di->fg_reinit_work); |
| flush_delayed_work(&di->fg_low_bat_work); |
| flush_delayed_work(&di->fg_check_hw_failure_work); |
| |
| /* |
| * If the FG is enabled we will disable it before going to suspend |
| * only if we're not charging |
| */ |
| if (di->flags.fg_enabled && !di->flags.charging) |
| ab8500_fg_coulomb_counter(di, false); |
| |
| return 0; |
| } |
| #else |
| #define ab8500_fg_suspend NULL |
| #define ab8500_fg_resume NULL |
| #endif |
| |
| static int ab8500_fg_remove(struct platform_device *pdev) |
| { |
| int ret = 0; |
| struct ab8500_fg *di = platform_get_drvdata(pdev); |
| |
| list_del(&di->node); |
| |
| /* Disable coulomb counter */ |
| ret = ab8500_fg_coulomb_counter(di, false); |
| if (ret) |
| dev_err(di->dev, "failed to disable coulomb counter\n"); |
| |
| destroy_workqueue(di->fg_wq); |
| ab8500_fg_sysfs_exit(di); |
| |
| flush_scheduled_work(); |
| ab8500_fg_sysfs_psy_remove_attrs(di); |
| power_supply_unregister(di->fg_psy); |
| return ret; |
| } |
| |
| /* ab8500 fg driver interrupts and their respective isr */ |
| static struct ab8500_fg_interrupts ab8500_fg_irq_th[] = { |
| {"NCONV_ACCU", ab8500_fg_cc_convend_handler}, |
| {"BATT_OVV", ab8500_fg_batt_ovv_handler}, |
| {"LOW_BAT_F", ab8500_fg_lowbatf_handler}, |
| {"CC_INT_CALIB", ab8500_fg_cc_int_calib_handler}, |
| }; |
| |
| static struct ab8500_fg_interrupts ab8500_fg_irq_bh[] = { |
| {"CCEOC", ab8500_fg_cc_data_end_handler}, |
| }; |
| |
| static char *supply_interface[] = { |
| "ab8500_chargalg", |
| "ab8500_usb", |
| }; |
| |
| static const struct power_supply_desc ab8500_fg_desc = { |
| .name = "ab8500_fg", |
| .type = POWER_SUPPLY_TYPE_BATTERY, |
| .properties = ab8500_fg_props, |
| .num_properties = ARRAY_SIZE(ab8500_fg_props), |
| .get_property = ab8500_fg_get_property, |
| .external_power_changed = ab8500_fg_external_power_changed, |
| }; |
| |
| static int ab8500_fg_probe(struct platform_device *pdev) |
| { |
| struct device_node *np = pdev->dev.of_node; |
| struct abx500_bm_data *plat = pdev->dev.platform_data; |
| struct power_supply_config psy_cfg = {}; |
| struct ab8500_fg *di; |
| int i, irq; |
| int ret = 0; |
| |
| di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL); |
| if (!di) { |
| dev_err(&pdev->dev, "%s no mem for ab8500_fg\n", __func__); |
| return -ENOMEM; |
| } |
| |
| if (!plat) { |
| dev_err(&pdev->dev, "no battery management data supplied\n"); |
| return -EINVAL; |
| } |
| di->bm = plat; |
| |
| if (np) { |
| ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to get battery information\n"); |
| return ret; |
| } |
| } |
| |
| mutex_init(&di->cc_lock); |
| |
| /* get parent data */ |
| di->dev = &pdev->dev; |
| di->parent = dev_get_drvdata(pdev->dev.parent); |
| |
| di->main_bat_v = devm_iio_channel_get(&pdev->dev, "main_bat_v"); |
| if (IS_ERR(di->main_bat_v)) { |
| if (PTR_ERR(di->main_bat_v) == -ENODEV) |
| return -EPROBE_DEFER; |
| dev_err(&pdev->dev, "failed to get main battery ADC channel\n"); |
| return PTR_ERR(di->main_bat_v); |
| } |
| |
| psy_cfg.supplied_to = supply_interface; |
| psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface); |
| psy_cfg.drv_data = di; |
| |
| di->bat_cap.max_mah_design = MILLI_TO_MICRO * |
| di->bm->bat_type[di->bm->batt_id].charge_full_design; |
| |
| di->bat_cap.max_mah = di->bat_cap.max_mah_design; |
| |
| di->vbat_nom = di->bm->bat_type[di->bm->batt_id].nominal_voltage; |
| |
| di->init_capacity = true; |
| |
| ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT); |
| ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT); |
| |
| /* Create a work queue for running the FG algorithm */ |
| di->fg_wq = alloc_ordered_workqueue("ab8500_fg_wq", WQ_MEM_RECLAIM); |
| if (di->fg_wq == NULL) { |
| dev_err(di->dev, "failed to create work queue\n"); |
| return -ENOMEM; |
| } |
| |
| /* Init work for running the fg algorithm instantly */ |
| INIT_WORK(&di->fg_work, ab8500_fg_instant_work); |
| |
| /* Init work for getting the battery accumulated current */ |
| INIT_WORK(&di->fg_acc_cur_work, ab8500_fg_acc_cur_work); |
| |
| /* Init work for reinitialising the fg algorithm */ |
| INIT_DEFERRABLE_WORK(&di->fg_reinit_work, |
| ab8500_fg_reinit_work); |
| |
| /* Work delayed Queue to run the state machine */ |
| INIT_DEFERRABLE_WORK(&di->fg_periodic_work, |
| ab8500_fg_periodic_work); |
| |
| /* Work to check low battery condition */ |
| INIT_DEFERRABLE_WORK(&di->fg_low_bat_work, |
| ab8500_fg_low_bat_work); |
| |
| /* Init work for HW failure check */ |
| INIT_DEFERRABLE_WORK(&di->fg_check_hw_failure_work, |
| ab8500_fg_check_hw_failure_work); |
| |
| /* Reset battery low voltage flag */ |
| di->flags.low_bat = false; |
| |
| /* Initialize low battery counter */ |
| di->low_bat_cnt = 10; |
| |
| /* Initialize OVV, and other registers */ |
| ret = ab8500_fg_init_hw_registers(di); |
| if (ret) { |
| dev_err(di->dev, "failed to initialize registers\n"); |
| goto free_inst_curr_wq; |
| } |
| |
| /* Consider battery unknown until we're informed otherwise */ |
| di->flags.batt_unknown = true; |
| di->flags.batt_id_received = false; |
| |
| /* Register FG power supply class */ |
| di->fg_psy = power_supply_register(di->dev, &ab8500_fg_desc, &psy_cfg); |
| if (IS_ERR(di->fg_psy)) { |
| dev_err(di->dev, "failed to register FG psy\n"); |
| ret = PTR_ERR(di->fg_psy); |
| goto free_inst_curr_wq; |
| } |
| |
| di->fg_samples = SEC_TO_SAMPLE(di->bm->fg_params->init_timer); |
| ab8500_fg_coulomb_counter(di, true); |
| |
| /* |
| * Initialize completion used to notify completion and start |
| * of inst current |
| */ |
| init_completion(&di->ab8500_fg_started); |
| init_completion(&di->ab8500_fg_complete); |
| |
| /* Register primary interrupt handlers */ |
| for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq_th); i++) { |
| irq = platform_get_irq_byname(pdev, ab8500_fg_irq_th[i].name); |
| if (irq < 0) { |
| ret = irq; |
| goto free_irq_th; |
| } |
| |
| ret = request_irq(irq, ab8500_fg_irq_th[i].isr, |
| IRQF_SHARED | IRQF_NO_SUSPEND, |
| ab8500_fg_irq_th[i].name, di); |
| |
| if (ret != 0) { |
| dev_err(di->dev, "failed to request %s IRQ %d: %d\n", |
| ab8500_fg_irq_th[i].name, irq, ret); |
| goto free_irq_th; |
| } |
| dev_dbg(di->dev, "Requested %s IRQ %d: %d\n", |
| ab8500_fg_irq_th[i].name, irq, ret); |
| } |
| |
| /* Register threaded interrupt handler */ |
| irq = platform_get_irq_byname(pdev, ab8500_fg_irq_bh[0].name); |
| if (irq < 0) { |
| ret = irq; |
| goto free_irq_th; |
| } |
| |
| ret = request_threaded_irq(irq, NULL, ab8500_fg_irq_bh[0].isr, |
| IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT, |
| ab8500_fg_irq_bh[0].name, di); |
| |
| if (ret != 0) { |
| dev_err(di->dev, "failed to request %s IRQ %d: %d\n", |
| ab8500_fg_irq_bh[0].name, irq, ret); |
| goto free_irq_th; |
| } |
| dev_dbg(di->dev, "Requested %s IRQ %d: %d\n", |
| ab8500_fg_irq_bh[0].name, irq, ret); |
| |
| di->irq = platform_get_irq_byname(pdev, "CCEOC"); |
| disable_irq(di->irq); |
| di->nbr_cceoc_irq_cnt = 0; |
| |
| platform_set_drvdata(pdev, di); |
| |
| ret = ab8500_fg_sysfs_init(di); |
| if (ret) { |
| dev_err(di->dev, "failed to create sysfs entry\n"); |
| goto free_irq; |
| } |
| |
| ret = ab8500_fg_sysfs_psy_create_attrs(di); |
| if (ret) { |
| dev_err(di->dev, "failed to create FG psy\n"); |
| ab8500_fg_sysfs_exit(di); |
| goto free_irq; |
| } |
| |
| /* Calibrate the fg first time */ |
| di->flags.calibrate = true; |
| di->calib_state = AB8500_FG_CALIB_INIT; |
| |
| /* Use room temp as default value until we get an update from driver. */ |
| di->bat_temp = 210; |
| |
| /* Run the FG algorithm */ |
| queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); |
| |
| list_add_tail(&di->node, &ab8500_fg_list); |
| |
| return ret; |
| |
| free_irq: |
| /* We also have to free all registered irqs */ |
| irq = platform_get_irq_byname(pdev, ab8500_fg_irq_bh[0].name); |
| free_irq(irq, di); |
| free_irq_th: |
| while (--i >= 0) { |
| /* Last assignment of i from primary interrupt handlers */ |
| irq = platform_get_irq_byname(pdev, ab8500_fg_irq_th[i].name); |
| free_irq(irq, di); |
| } |
| |
| power_supply_unregister(di->fg_psy); |
| free_inst_curr_wq: |
| destroy_workqueue(di->fg_wq); |
| return ret; |
| } |
| |
| static const struct of_device_id ab8500_fg_match[] = { |
| { .compatible = "stericsson,ab8500-fg", }, |
| { }, |
| }; |
| |
| static struct platform_driver ab8500_fg_driver = { |
| .probe = ab8500_fg_probe, |
| .remove = ab8500_fg_remove, |
| .suspend = ab8500_fg_suspend, |
| .resume = ab8500_fg_resume, |
| .driver = { |
| .name = "ab8500-fg", |
| .of_match_table = ab8500_fg_match, |
| }, |
| }; |
| |
| static int __init ab8500_fg_init(void) |
| { |
| return platform_driver_register(&ab8500_fg_driver); |
| } |
| |
| static void __exit ab8500_fg_exit(void) |
| { |
| platform_driver_unregister(&ab8500_fg_driver); |
| } |
| |
| subsys_initcall_sync(ab8500_fg_init); |
| module_exit(ab8500_fg_exit); |
| |
| MODULE_LICENSE("GPL v2"); |
| MODULE_AUTHOR("Johan Palsson, Karl Komierowski"); |
| MODULE_ALIAS("platform:ab8500-fg"); |
| MODULE_DESCRIPTION("AB8500 Fuel Gauge driver"); |