diff options
Diffstat (limited to 'drivers/power/ab8500_fg.c')
| -rw-r--r-- | drivers/power/ab8500_fg.c | 2637 |
1 files changed, 2637 insertions, 0 deletions
diff --git a/drivers/power/ab8500_fg.c b/drivers/power/ab8500_fg.c new file mode 100644 index 00000000000..c22f2f05657 --- /dev/null +++ b/drivers/power/ab8500_fg.c @@ -0,0 +1,2637 @@ +/* + * 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. + * + * License Terms: GNU General Public License v2 + * 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/mfd/abx500/ab8500.h> +#include <linux/mfd/abx500.h> +#include <linux/slab.h> +#include <linux/mfd/abx500/ab8500-bm.h> +#include <linux/delay.h> +#include <linux/mfd/abx500/ab8500-gpadc.h> +#include <linux/mfd/abx500.h> +#include <linux/time.h> +#include <linux/completion.h> + +#define MILLI_TO_MICRO 1000 +#define FG_LSB_IN_MA 1627 +#define QLSB_NANO_AMP_HOURS_X10 1129 +#define INS_CURR_TIMEOUT (3 * HZ) + +#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 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)))); + +#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_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]; + __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; + int user_mah; +}; + +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 + * @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_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 + * @gpadc: Pointer to the struct gpadc + * @pdata: Pointer to the abx500_fg platform data + * @bat: Pointer to the abx500_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_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; + 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_complete; + 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 abx500_fg_platform_data *pdata; + struct abx500_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 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) +{ + 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_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; + 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; + + 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); + + 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 */ + INIT_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_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; + int 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", + ((INS_CURR_TIMEOUT - timeout) * 1000) / HZ); + if (!timeout) { + ret = -ETIME; + disable_irq(di->irq); + dev_err(di->dev, "completion timed out [%d]\n", + __LINE__); + goto fail; + } + } + + disable_irq(di->irq); + + 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 + * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA + * Given a 250ms conversion cycle time the LSB corresponds + * to 112.9 nAh. Convert to current by dividing by the conversion + * time in hours (250ms = 1 / (3600 * 4)h) + * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm + */ + val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) / + (1000 * di->bat->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; + int res = 0; + + ret = ab8500_fg_inst_curr_start(di); + if (ret) { + dev_err(di->dev, "Failed to initialize fg_inst\n"); + return 0; + } + + ret = ab8500_fg_inst_curr_finalize(di, &res); + if (ret) { + dev_err(di->dev, "Failed to finalize fg_inst\n"); + return 0; + } + + return res; +} + +/** + * 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->bat->fg_res); + + /* + * Convert to unit value in mA + * Full scale input voltage is + * 66.660mV => LSB = 66.660mV/(4096*res) = 1.627mA + * Given a 250ms conversion cycle time the LSB corresponds + * to 112.9 nAh. Convert to current by dividing by the conversion + * time in hours (= samples / (3600 * 4)h) + * 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm + */ + di->avg_curr = (val * QLSB_NANO_AMP_HOURS_X10 * 36) / + (1000 * di->bat->fg_res * (di->fg_samples / 4)); + + 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 abx500_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_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; + struct batres_vs_temp *tbl; + int resist = 0; + + tbl = di->bat->bat_type[di->bat->batt_id].batres_tbl; + tbl_size = di->bat->bat_type[di->bat->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->bat->fg_res / 10, + (di->bat->fg_res / 10) + resist); + + /* fg_res variable is in 0.1mOhm */ + resist += di->bat->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++; + msleep(5); + } 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 = 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->flags.fully_charged) { + /* + * We report 100% if algorithm reported fully charged + * unless capacity drops too much + */ + if (di->flags.force_full) { + di->bat_cap.prev_percent = di->bat_cap.permille / 10; + di->bat_cap.prev_mah = di->bat_cap.mah; + } else if (!di->flags.force_full && + di->bat_cap.prev_percent != + (di->bat_cap.permille) / 10 && + (di->bat_cap.permille / 10) < + di->bat->fg_params->maint_thres) { + dev_dbg(di->dev, + "battery reported full " + "but capacity dropping: %d\n", + di->bat_cap.permille / 10); + di->bat_cap.prev_percent = di->bat_cap.permille / 10; + di->bat_cap.prev_mah = di->bat_cap.mah; + + 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); + 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, "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); +} + +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->bat->fg_params->user_cap_limit * 10; + upper = di->bat_cap.permille + di->bat->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->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) + 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->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_INIT: + 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); + 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 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. + */ + if (di->flags.bat_ovv) { + 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) { + dev_dbg(di->dev, "Battery recovered from OVV\n"); + di->flags.bat_ovv = false; + power_supply_changed(&di->fg_psy); + return; + } + + /* Not yet recovered from ovv, reschedule this test */ + queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, + round_jiffies(HZ)); + } +} + +/** + * 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_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->bat->fg_params->battok_falling_th_sel0; + sel1 = di->bat->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() - 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_data_end_handler(int irq, void *_di) +{ + struct ab8500_fg *di = _di; + complete(&di->ab8500_fg_complete); + 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_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); + + /* 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; + + 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 = 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->bat->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->bat->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->bat->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->bat->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; + 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; + 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) + 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 (!di->flags.batt_id_received) { + const struct abx500_battery_type *b; + + b = &(di->bat->bat_type[di->bat->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->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->bat->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; + } +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); +} + +/** + * abab8500_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)); + } +} + +/** + * ab8500_fg_reinit() - forces FG algorithm to reinitialize with current values + * + * This function can be used to force the FG algorithm to recalculate a new + * voltage based battery capacity. + */ +void ab8500_fg_reinit(void) +{ + struct ab8500_fg *di = ab8500_fg_get(); + /* User won't be notified if a null pointer returned. */ + if (di != NULL) + queue_delayed_work(di->fg_wq, &di->fg_reinit_work, 0); +} + +/* 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 %zd charge_full %lu", ret, charge_full); + + if (!ret) { + di->bat_cap.max_mah = (int) charge_full; + ret = count; + } + return ret; +} + +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; + ssize_t ret; + + ret = strict_strtoul(buf, 10, &charge_now); + + dev_dbg(di->dev, "Ret %zd charge_now %lu was %d", + ret, charge_now, di->bat_cap.prev_mah); + + if (!ret) { + di->bat_cap.user_mah = (int) charge_now; + di->flags.user_cap = true; + ret = count; + queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0); + } + return ret; +} + +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_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, "battery"); + if (ret < 0) + dev_err(di->dev, "failed to create sysfs entry\n"); + + return ret; +} +/* 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); + + /* + * 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"); + + 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}, + {"CCEOC", ab8500_fg_cc_data_end_handler}, +}; + +static int __devinit ab8500_fg_probe(struct platform_device *pdev) +{ + int i, irq; + int ret = 0; + struct abx500_bm_plat_data *plat_data; + + 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("ab8500-gpadc.0"); + + /* get fg specific platform data */ + plat_data = pdev->dev.platform_data; + di->pdata = plat_data->fg; + if (!di->pdata) { + dev_err(di->dev, "no fg platform data supplied\n"); + ret = -EINVAL; + goto free_device_info; + } + + /* get battery specific platform data */ + di->bat = plat_data->battery; + if (!di->bat) { + dev_err(di->dev, "no battery platform data supplied\n"); + ret = -EINVAL; + goto free_device_info; + } + + 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; + + 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; + } + + /* 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_DELAYED_WORK_DEFERRABLE(&di->fg_reinit_work, + ab8500_fg_reinit_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); + + /* Init work for HW failure check */ + INIT_DELAYED_WORK_DEFERRABLE(&di->fg_check_hw_failure_work, + ab8500_fg_check_hw_failure_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; + di->flags.batt_id_received = false; + + /* 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); + + /* Initialize completion used to notify completion of inst current */ + init_completion(&di->ab8500_fg_complete); + + /* 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); + } + di->irq = platform_get_irq_byname(pdev, "CCEOC"); + disable_irq(di->irq); + + 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; + + /* 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: + 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->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"); |