/* * Copyright (C) ST-Ericsson AB 2010 * * 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. * * License Terms: GNU General Public License v2 * Author: Johan Palsson * Author: Karl Komierowski */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define MILLI_TO_MICRO 1000 #define FG_LSB_IN_MA 1627 #define QLSB_NANO_AMP_HOURS_X10 1129 #define SEC_TO_SAMPLE(S) (S * 4) #define NBR_AVG_SAMPLES 20 #define LOW_BAT_CHECK_INTERVAL (2 * HZ) #define VALID_CAPACITY_SEC (45 * 60) /* 45 minutes */ #define interpolate(x, x1, y1, x2, y2) \ ((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1)))); #define to_ab8500_fg_device_info(x) container_of((x), \ struct ab8500_fg, fg_psy); /** * 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, AB8500_FG_DISCHARGE_WAKEUP, }; static char *discharge_state[] = { "DISCHARGE_INIT", "DISCHARGE_INITMEASURING", "DISCHARGE_INIT_RECOVERY", "DISCHARGE_RECOVERY", "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]; __kernel_time_t time_stamps[NBR_AVG_SAMPLES]; int pos; int nbr_samples; int sum; }; 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; }; struct ab8500_fg_flags { bool fg_enabled; bool conv_done; bool charging; bool fully_charged; bool low_bat_delay; bool low_bat; bool bat_ovv; bool batt_unknown; bool calibrate; }; 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 * @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 * @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 * @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 * @inst_curr_mip: Indicate if 'instant' current measurement is in progress * AB8500 does not support real instant current * readings. The best we can do is sample over * 250ms. * @inst_curr_lock: Control access to inst curr wait queues and result lists * @inst_curr_wq: Work queue for running 'instant' current measurements * @fg_inst_curr_work: Work to measure 'instant' current * @result_wq: Wait queue for blocking 'instant' current clients * @cpw_a_wq: Physical wait queue A for concurrent inst curr clients * @cpw_b_wq: Physical wait queue B for concurrent inst curr clients * @cpw_next_wq: Logical next wait queue for concurrent inst curr clients * @cpw_this_wq: Logical this wait queue for concurrent inst curr clients * @inst_curr_result: Result register for blocking instant current clients * @result_a_list: Physical result list A for concurrent inst curr clients * @result_b_list: Physical result list B for concurrent inst curr clients * @next_result_list: Logical next results for concurrent inst curr clients * @this_result_list: Logical this results for concurrent inst curr clients * @calib_state State during offset calibration * @discharge_state: Current discharge state * @charge_state: Current charge state * @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 * @gpadc: Pointer to the struct gpadc * @pdata: Pointer to the ab8500_fg platform data * @bat: Pointer to the ab8500_bm platform data * @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_work: Work to run the FG algorithm instantly * @fg_acc_cur_work: Work to read the FG accumulator * @cc_lock: Mutex for locking the CC * @fg_kobject: Structure of type kobject */ struct ab8500_fg { struct device *dev; struct list_head node; int vbat; int vbat_nom; int inst_curr; int avg_curr; int fg_samples; int accu_charge; int recovery_cnt; int high_curr_cnt; int init_cnt; bool recovery_needed; bool high_curr_mode; bool init_capacity; bool inst_curr_mip; spinlock_t inst_curr_lock; struct workqueue_struct *inst_curr_wq; struct delayed_work fg_inst_curr_work; wait_queue_head_t result_wq; wait_queue_head_t cpw_a_wq; wait_queue_head_t cpw_b_wq; wait_queue_head_t *cpw_next_wq; wait_queue_head_t *cpw_this_wq; int inst_curr_result; struct list_head result_a_list; struct list_head result_b_list; struct list_head *next_result_list; struct list_head *this_result_list; enum ab8500_fg_calibration_state calib_state; enum ab8500_fg_discharge_state discharge_state; enum ab8500_fg_charge_state charge_state; struct ab8500_fg_flags flags; struct ab8500_fg_battery_capacity bat_cap; struct ab8500_fg_avg_cap avg_cap; struct ab8500 *parent; struct ab8500_gpadc *gpadc; struct ab8500_fg_platform_data *pdata; struct ab8500_bm_data *bat; struct power_supply fg_psy; struct workqueue_struct *fg_wq; struct delayed_work fg_periodic_work; struct delayed_work fg_low_bat_work; struct work_struct fg_work; struct work_struct fg_acc_cur_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) { struct ab8500_fg *fg; if (list_empty(&ab8500_fg_list)) return NULL; fg = list_first_entry(&ab8500_fg_list, struct ab8500_fg, node); return fg; } /* 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->bat->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) { struct timespec ts; struct ab8500_fg_avg_cap *avg = &di->avg_cap; getnstimeofday(&ts); do { avg->sum += sample - avg->samples[avg->pos]; avg->samples[avg->pos] = sample; avg->time_stamps[avg->pos] = ts.tv_sec; 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 (ts.tv_sec - VALID_CAPACITY_SEC > avg->time_stamps[avg->pos]); avg->avg = avg->sum / avg->nbr_samples; return avg->avg; } /** * 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; struct timespec ts; struct ab8500_fg_avg_cap *avg = &di->avg_cap; getnstimeofday(&ts); for (i = 0; i < NBR_AVG_SAMPLES; i++) { avg->samples[i] = sample; avg->time_stamps[i] = ts.tv_sec; } 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_set_register_interruptible(di->dev, AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 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_nonblocking() - battery instantaneous current * @di: pointer to the ab8500_fg structure * @local_result: pointer to result location, updated after measurement is * completed ~250ms after this function returns * * Returns error code */ int ab8500_fg_inst_curr_nonblocking(struct ab8500_fg *di, int *local_result) { DEFINE_WAIT(wait); /* * caller needs to do some other work at * the same time as current measurement */ wait_queue_head_t *cpw_my_wq; struct inst_curr_result_list *new = kmalloc(sizeof(struct inst_curr_result_list), GFP_KERNEL); if (!new) return -ENOMEM; new->result = local_result; *local_result = INVALID_CURRENT; INIT_LIST_HEAD(&new->list); spin_lock(&di->inst_curr_lock); list_add(&new->list, di->next_result_list); cpw_my_wq = di->cpw_next_wq; add_wait_queue(cpw_my_wq, &wait); /* queue_work may schedule */ queue_delayed_work(di->inst_curr_wq, &di->fg_inst_curr_work, 1); set_current_state(TASK_UNINTERRUPTIBLE); spin_unlock(&di->inst_curr_lock); schedule(); finish_wait(cpw_my_wq, &wait); return 0; } /** * ab8500_fg_inst_curr_blocking() - battery instantaneous current * @di: pointer to the ab8500_fg structure * * Returns battery instantenous current(on success) else error code */ int ab8500_fg_inst_curr_blocking(struct ab8500_fg *di) { DEFINE_WAIT(wait); /* caller will wait for the next available result */ spin_lock(&di->inst_curr_lock); add_wait_queue(&di->result_wq, &wait); if (!di->inst_curr_mip) /* queue_work may schedule */ queue_delayed_work(di->inst_curr_wq, &di->fg_inst_curr_work, 1); set_current_state(TASK_UNINTERRUPTIBLE); spin_unlock(&di->inst_curr_lock); schedule(); finish_wait(&di->result_wq, &wait); return di->inst_curr_result; } /** * ab8500_fg_inst_curr_work() - take an 'instant' battery current reading * @work: pointer to the work_struct structure * * AB8500 does not provide instant current readings, the best we can do is * average over 250ms. */ static void ab8500_fg_inst_curr_work(struct work_struct *work) { struct list_head *temp_result_list; wait_queue_head_t *cpw_temp_wq; u8 low, high, reg_val; static int val; int ret = 0; bool fg_off = false; struct ab8500_fg *di = container_of(work, struct ab8500_fg, fg_inst_curr_work.work); spin_lock(&di->inst_curr_lock); temp_result_list = di->next_result_list; cpw_temp_wq = di->cpw_next_wq; di->next_result_list = di->this_result_list; di->cpw_next_wq = di->cpw_this_wq; di->this_result_list = temp_result_list; di->cpw_this_wq = cpw_temp_wq; di->inst_curr_mip = true; spin_unlock(&di->inst_curr_lock); mutex_lock(&di->cc_lock); ret = abx500_get_register_interruptible(di->dev, AB8500_RTC, AB8500_RTC_CC_CONF_REG, ®_val); if (ret < 0) goto inst_curr_err1; if (!(reg_val & CC_PWR_UP_ENA)) { dev_dbg(di->dev, "%s Enable FG\n", __func__); fg_off = 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 inst_curr_err1; /* 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 inst_curr_err1; } /* Reset counter and Read request */ ret = abx500_set_register_interruptible(di->dev, AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, (RESET_ACCU | READ_REQ)); if (ret) goto inst_curr_err1; wake_up(di->cpw_this_wq); /* * Since there is no interrupt for this, just wait for 250ms * 250ms is one sample conversion time with 32.768 Khz RTC clock */ msleep(250); /* 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 inst_curr_err2; ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE, AB8500_GASG_CC_SMPL_CNVH_REG, &high); if (ret < 0) goto inst_curr_err2; /* * 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 * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA * resistance is in mOhm */ val = ((val * 66660) / (4096 * di->bat->fg_res)); if (fg_off) { 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 inst_curr_err3; /* Stop the CC */ ret = abx500_set_register_interruptible(di->dev, AB8500_RTC, AB8500_RTC_CC_CONF_REG, 0); if (ret) goto inst_curr_err3; } finished: mutex_unlock(&di->cc_lock); spin_lock(&di->inst_curr_lock); di->inst_curr_result = val; while (!list_empty(di->this_result_list)) { struct inst_curr_result_list *this = list_first_entry( di->this_result_list, struct inst_curr_result_list, list); *(this->result) = val; list_del(&this->list); kfree(this); } di->inst_curr_mip = false; wake_up(&di->result_wq); spin_unlock(&di->inst_curr_lock); return; inst_curr_err1: wake_up(di->cpw_this_wq); inst_curr_err2: val = 0; inst_curr_err3: dev_err(di->dev, "%s Get instanst current failed\n", __func__); goto finished; } /** * 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)); di->accu_charge = (val * QLSB_NANO_AMP_HOURS_X10)/10000; di->avg_curr = (val * FG_LSB_IN_MA) / (di->fg_samples * 1000); di->flags.conv_done = true; mutex_unlock(&di->cc_lock); queue_work(di->fg_wq, &di->fg_work); 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; static int prev; vbat = ab8500_gpadc_convert(di->gpadc, MAIN_BAT_V); if (vbat < 0) { dev_err(di->dev, "%s gpadc 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; struct v_to_cap *tbl; int cap = 0; tbl = di->bat->bat_type[di->bat->batt_id].v_to_cap_tbl, tbl_size = di->bat->bat_type[di->bat->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_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; di->inst_curr = ab8500_fg_inst_curr_blocking(di); di->vbat = ab8500_fg_bat_voltage(di); /* Use Ohms law to get the load compensated voltage */ vbat_comp = di->vbat - (di->inst_curr * di->bat->bat_type[di->bat->batt_id].battery_resistance) / 1000; dev_dbg(di->dev, "%s Measured Vbat: %dmV,Compensated Vbat %dmV, " "R: %dmOhm, Current: %dmA\n", __func__, di->vbat, vbat_comp, di->bat->bat_type[di->bat->batt_id].battery_resistance, di->inst_curr); 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% as long as the algorithm * reports that it's full. */ if (di->bat_cap.mah >= di->bat_cap.max_mah_design || di->flags.fully_charged) 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 = di->bat_cap.permille / 10; if (percent <= di->bat->cap_levels->critical || di->flags.low_bat) ret = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; else if (percent <= di->bat->cap_levels->low) ret = POWER_SUPPLY_CAPACITY_LEVEL_LOW; else if (percent <= di->bat->cap_levels->normal) ret = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; else if (percent <= di->bat->cap_levels->high) ret = POWER_SUPPLY_CAPACITY_LEVEL_HIGH; else ret = POWER_SUPPLY_CAPACITY_LEVEL_FULL; return ret; } /** * 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; 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; di->bat_cap.prev_mah = 0; di->bat_cap.mah = 0; changed = true; } else if (di->bat_cap.prev_percent != di->bat_cap.permille / 10) { if (di->bat_cap.permille / 10 == 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; di->bat_cap.permille = 1; di->bat_cap.prev_mah = 1; di->bat_cap.mah = 1; changed = true; } else if (!(!di->flags.charging && (di->bat_cap.permille / 10) > 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, di->bat_cap.permille / 10, di->bat_cap.permille); di->bat_cap.prev_percent = di->bat_cap.permille / 10; 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, di->bat_cap.permille / 10, di->bat_cap.permille); } } if (changed) power_supply_changed(&di->fg_psy); } 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_charge_state new_state) { dev_dbg(di->dev, "Disharge 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->bat->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) { /* 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); } /** * 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->bat->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->bat->fg_params->init_timer; /* Discard the first [x] seconds */ if (di->init_cnt > di->bat->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->bat->fg_params->init_total_time) { di->fg_samples = SEC_TO_SAMPLE( di->bat->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_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->bat->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->bat->fg_params->recovery_total_time) { di->fg_samples = SEC_TO_SAMPLE( di->bat->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->bat->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_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->bat->fg_params->accu_high_curr; if (di->high_curr_cnt > di->bat->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_coulomb_counter(di, true); di->inst_curr = ab8500_fg_inst_curr_blocking(di); ab8500_fg_calc_cap_discharge_voltage(di, true); di->fg_samples = SEC_TO_SAMPLE( di->bat->fg_params->accu_high_curr); /* Re-program number of samples set above */ 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\n", di->bat_cap.max_mah_design, 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) { /* A dummy read that will return 0 */ di->inst_curr = ab8500_fg_inst_curr_blocking(di); /* 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 ab8500_fg_algorithm(di); } /** * 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->bat->fg_params->lowbat_threshold) { di->flags.low_bat = true; dev_warn(di->dev, "Battery voltage still LOW\n"); /* * We need to re-schedule this check to be able to detect * if the voltage increases again during charging */ queue_delayed_work(di->fg_wq, &di->fg_low_bat_work, round_jiffies(LOW_BAT_CHECK_INTERVAL)); } else { di->flags.low_bat = false; dev_warn(di->dev, "Battery voltage OK again\n"); } /* This is needed to dispatch LOW_BAT */ ab8500_fg_check_capacity_limits(di, false); /* Set this flag to check if LOW_BAT IRQ still occurs */ di->flags.low_bat_delay = false; } /** * 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_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_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"); di->flags.bat_ovv = true; power_supply_changed(&di->fg_psy); 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; 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; di = to_ab8500_fg_device_info(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 = 47500000; 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->bat->chg_unknown_bat) 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->bat->chg_unknown_bat) 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->bat->chg_unknown_bat) val->intval = 100; else val->intval = di->bat_cap.prev_percent; break; case POWER_SUPPLY_PROP_CAPACITY_LEVEL: if (di->flags.batt_unknown && !di->bat->chg_unknown_bat) 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; struct ab8500_fg *di; union power_supply_propval ret; int i, j; bool psy_found = false; psy = (struct power_supply *)data; ext = dev_get_drvdata(dev); di = to_ab8500_fg_device_info(psy); /* * For all psy where the name of your driver * appears in any supplied_to */ for (i = 0; i < ext->num_supplicants; i++) { if (!strcmp(ext->supplied_to[i], psy->name)) psy_found = true; } if (!psy_found) return 0; /* Go through all properties for the psy */ for (j = 0; j < ext->num_properties; j++) { enum power_supply_property prop; prop = ext->properties[j]; if (ext->get_property(ext, prop, &ret)) continue; switch (prop) { case POWER_SUPPLY_PROP_STATUS: switch (ext->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; 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; /* Save current capacity as maximum */ di->bat_cap.max_mah = di->bat_cap.mah; sysfs_notify(&di->fg_kobject, NULL, "charge_full"); queue_work(di->fg_wq, &di->fg_work); break; case POWER_SUPPLY_STATUS_CHARGING: if (di->flags.charging) break; di->flags.charging = true; di->flags.fully_charged = false; queue_work(di->fg_wq, &di->fg_work); break; }; default: break; }; break; case POWER_SUPPLY_PROP_TECHNOLOGY: switch (ext->type) { case POWER_SUPPLY_TYPE_BATTERY: if (ret.intval) di->flags.batt_unknown = false; else di->flags.batt_unknown = true; 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 up VBAT OVV register */ ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER, AB8500_BATT_OVV, (BATT_OVV_ENA | BATT_OVV_TH_4P75)); if (ret) { dev_err(di->dev, "failed to set 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->bat->fg_params->lowbat_threshold) << 1 | LOW_BAT_ENABLE); if (ret) { dev_err(di->dev, "%s write failed\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 = to_ab8500_fg_device_info(psy); class_for_each_device(power_supply_class, NULL, &di->fg_psy, ab8500_fg_get_ext_psy_data); } /* 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; ssize_t ret = -EINVAL; ret = strict_strtoul(buf, 10, &charge_full); dev_dbg(di->dev, "Ret %d charge_full %lu", ret, charge_full); if (!ret) { di->bat_cap.max_mah = (int) charge_full; ret = count; } return ret; } static struct ab8500_fg_sysfs_entry charge_full_attr = __ATTR(charge_full, 0644, charge_full_show, charge_full_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); } 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, NULL, }; static struct kobj_type ab8500_fg_ktype = { .sysfs_ops = &ab8500_fg_sysfs_ops, .default_attrs = ab8500_fg_attrs, }; /** * ab8500_chargalg_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_chargalg_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, "ab8500_fg"); if (ret < 0) dev_err(di->dev, "failed to create sysfs entry\n"); return ret; } /* Exposure to the sysfs interface <> */ #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); /* * 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 __devexit 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"); flush_workqueue(di->inst_curr_wq); destroy_workqueue(di->inst_curr_wq); destroy_workqueue(di->fg_wq); ab8500_fg_sysfs_exit(di); flush_scheduled_work(); power_supply_unregister(&di->fg_psy); platform_set_drvdata(pdev, NULL); kfree(di); return ret; } /* ab8500 fg driver interrupts and their respective isr */ static struct ab8500_fg_interrupts ab8500_fg_irq[] = { {"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 int __devinit ab8500_fg_probe(struct platform_device *pdev) { int i, irq; struct ab8500_platform_data *plat; int ret = 0; struct ab8500_fg *di = kzalloc(sizeof(struct ab8500_fg), GFP_KERNEL); if (!di) return -ENOMEM; mutex_init(&di->cc_lock); /* get parent data */ di->dev = &pdev->dev; di->parent = dev_get_drvdata(pdev->dev.parent); di->gpadc = ab8500_gpadc_get(); plat = dev_get_platdata(di->parent->dev); /* get fg specific platform data */ if (!plat->fg) { dev_err(di->dev, "no fg platform data supplied\n"); ret = -EINVAL; goto free_device_info; } di->pdata = plat->fg; /* get battery specific platform data */ if (!plat->battery) { dev_err(di->dev, "no battery platform data supplied\n"); ret = -EINVAL; goto free_device_info; } di->bat = plat->battery; di->fg_psy.name = "ab8500_fg"; di->fg_psy.type = POWER_SUPPLY_TYPE_BATTERY; di->fg_psy.properties = ab8500_fg_props; di->fg_psy.num_properties = ARRAY_SIZE(ab8500_fg_props); di->fg_psy.get_property = ab8500_fg_get_property; di->fg_psy.supplied_to = di->pdata->supplied_to; di->fg_psy.num_supplicants = di->pdata->num_supplicants; di->fg_psy.external_power_changed = ab8500_fg_external_power_changed; di->bat_cap.max_mah_design = MILLI_TO_MICRO * di->bat->bat_type[di->bat->batt_id].charge_full_design; di->bat_cap.max_mah = di->bat_cap.max_mah_design; di->vbat_nom = di->bat->bat_type[di->bat->batt_id].nominal_voltage; di->init_capacity = true; di->inst_curr_mip = false; spin_lock_init(&di->inst_curr_lock); init_waitqueue_head(&di->result_wq); init_waitqueue_head(&di->cpw_a_wq); init_waitqueue_head(&di->cpw_b_wq); di->cpw_next_wq = &di->cpw_a_wq; di->cpw_this_wq = &di->cpw_b_wq; di->inst_curr_result = 0; INIT_LIST_HEAD(&di->result_a_list); INIT_LIST_HEAD(&di->result_b_list); di->next_result_list = &di->result_a_list; di->this_result_list = &di->result_b_list; 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 = create_singlethread_workqueue("ab8500_fg_wq"); if (di->fg_wq == NULL) { dev_err(di->dev, "failed to create work queue\n"); goto free_device_info; } di->inst_curr_wq = create_singlethread_workqueue("ab8500_inst_curr_wq"); if (di->inst_curr_wq == NULL) { dev_err(di->dev, "failed to create work queue\n"); goto free_fg_wq; } /* Init work for running the instant current measurment */ INIT_DELAYED_WORK_DEFERRABLE(&di->fg_inst_curr_work, ab8500_fg_inst_curr_work); /* 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); /* Work delayed Queue to run the state machine */ INIT_DELAYED_WORK_DEFERRABLE(&di->fg_periodic_work, ab8500_fg_periodic_work); /* Work to check low battery condition */ INIT_DELAYED_WORK_DEFERRABLE(&di->fg_low_bat_work, ab8500_fg_low_bat_work); /* 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; /* Register FG power supply class */ ret = power_supply_register(di->dev, &di->fg_psy); if (ret) { dev_err(di->dev, "failed to register FG psy\n"); goto free_inst_curr_wq; } di->fg_samples = SEC_TO_SAMPLE(di->bat->fg_params->init_timer); ab8500_fg_coulomb_counter(di, true); /* Register interrupts */ for (i = 0; i < ARRAY_SIZE(ab8500_fg_irq); i++) { irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name); ret = request_threaded_irq(irq, NULL, ab8500_fg_irq[i].isr, IRQF_SHARED | IRQF_NO_SUSPEND, ab8500_fg_irq[i].name, di); if (ret != 0) { dev_err(di->dev, "failed to request %s IRQ %d: %d\n" , ab8500_fg_irq[i].name, irq, ret); goto free_irq; } dev_dbg(di->dev, "Requested %s IRQ %d: %d\n", ab8500_fg_irq[i].name, irq, ret); } 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; } /* Calibrate the fg first time */ di->flags.calibrate = true; di->calib_state = AB8500_FG_CALIB_INIT; /* 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: power_supply_unregister(&di->fg_psy); /* We also have to free all successfully registered irqs */ for (i = i - 1; i >= 0; i--) { irq = platform_get_irq_byname(pdev, ab8500_fg_irq[i].name); free_irq(irq, di); } free_inst_curr_wq: destroy_workqueue(di->inst_curr_wq); free_fg_wq: destroy_workqueue(di->fg_wq); free_device_info: kfree(di); return ret; } static struct platform_driver ab8500_fg_driver = { .probe = ab8500_fg_probe, .remove = __devexit_p(ab8500_fg_remove), .suspend = ab8500_fg_suspend, .resume = ab8500_fg_resume, .driver = { .name = "ab8500-fg", .owner = THIS_MODULE, }, }; 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");