--- /dev/null
+/*
+ * 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 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_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);
+}
+
+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 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 %d 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 %d 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);
+}
+
+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");
projects / platform / adaptation / renesas_rcar / renesas_kernel.git / commitdiff