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linux/drivers/power/ab8500_fg.c
Linus Torvalds e6b5be2be4 Driver core patches for 3.19-rc1 
Here's the set of driver core patches for 3.19-rc1.
 
 They are dominated by the removal of the .owner field in platform
 drivers.  They touch a lot of files, but they are "simple" changes, just
 removing a line in a structure.
 
 Other than that, a few minor driver core and debugfs changes.  There are
 some ath9k patches coming in through this tree that have been acked by
 the wireless maintainers as they relied on the debugfs changes.
 
 Everything has been in linux-next for a while.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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 Version: GnuPG v2
 
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 =OVRS
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Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core update from Greg KH:
 "Here's the set of driver core patches for 3.19-rc1.

  They are dominated by the removal of the .owner field in platform
  drivers.  They touch a lot of files, but they are "simple" changes,
  just removing a line in a structure.

  Other than that, a few minor driver core and debugfs changes.  There
  are some ath9k patches coming in through this tree that have been
  acked by the wireless maintainers as they relied on the debugfs
  changes.

  Everything has been in linux-next for a while"

* tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits)
  Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries"
  fs: debugfs: add forward declaration for struct device type
  firmware class: Deletion of an unnecessary check before the function call "vunmap"
  firmware loader: fix hung task warning dump
  devcoredump: provide a one-way disable function
  device: Add dev_<level>_once variants
  ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries
  ath: use seq_file api for ath9k debugfs files
  debugfs: add helper function to create device related seq_file
  drivers/base: cacheinfo: remove noisy error boot message
  Revert "core: platform: add warning if driver has no owner"
  drivers: base: support cpu cache information interface to userspace via sysfs
  drivers: base: add cpu_device_create to support per-cpu devices
  topology: replace custom attribute macros with standard DEVICE_ATTR*
  cpumask: factor out show_cpumap into separate helper function
  driver core: Fix unbalanced device reference in drivers_probe
  driver core: fix race with userland in device_add()
  sysfs/kernfs: make read requests on pre-alloc files use the buffer.
  sysfs/kernfs: allow attributes to request write buffer be pre-allocated.
  fs: sysfs: return EGBIG on write if offset is larger than file size
  ...
2014-12-14 16:10:09 -08:00

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/*
* 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/slab.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <linux/time64.h>
#include <linux/of.h>
#include <linux/completion.h>
#include <linux/mfd/core.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/mfd/abx500/ab8500-bm.h>
#include <linux/mfd/abx500/ab8500-gpadc.h>
#include <linux/kernel.h>
#define MILLI_TO_MICRO 1000
#define FG_LSB_IN_MA 1627
#define QLSB_NANO_AMP_HOURS_X10 1071
#define INS_CURR_TIMEOUT (3 * HZ)
#define SEC_TO_SAMPLE(S) (S * 4)
#define NBR_AVG_SAMPLES 20
#define LOW_BAT_CHECK_INTERVAL (HZ / 16) /* 62.5 ms */
#define VALID_CAPACITY_SEC (45 * 60) /* 45 minutes */
#define BATT_OK_MIN 2360 /* mV */
#define BATT_OK_INCREMENT 50 /* mV */
#define BATT_OK_MAX_NR_INCREMENTS 0xE
/* FG constants */
#define BATT_OVV 0x01
#define interpolate(x, x1, y1, x2, y2) \
((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1))));
#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];
time64_t time_stamps[NBR_AVG_SAMPLES];
int pos;
int nbr_samples;
int sum;
};
struct ab8500_fg_cap_scaling {
bool enable;
int cap_to_scale[2];
int disable_cap_level;
int scaled_cap;
};
struct ab8500_fg_battery_capacity {
int max_mah_design;
int max_mah;
int mah;
int permille;
int level;
int prev_mah;
int prev_percent;
int prev_level;
int user_mah;
struct ab8500_fg_cap_scaling cap_scale;
};
struct ab8500_fg_flags {
bool fg_enabled;
bool conv_done;
bool charging;
bool fully_charged;
bool force_full;
bool low_bat_delay;
bool low_bat;
bool bat_ovv;
bool batt_unknown;
bool calibrate;
bool user_cap;
bool batt_id_received;
};
struct inst_curr_result_list {
struct list_head list;
int *result;
};
/**
* struct ab8500_fg - ab8500 FG device information
* @dev: Pointer to the structure device
* @node: a list of AB8500 FGs, hence prepared for reentrance
* @irq holds the CCEOC interrupt number
* @vbat: Battery voltage in mV
* @vbat_nom: Nominal battery voltage in mV
* @inst_curr: Instantenous battery current in mA
* @avg_curr: Average battery current in mA
* @bat_temp battery temperature
* @fg_samples: Number of samples used in the FG accumulation
* @accu_charge: Accumulated charge from the last conversion
* @recovery_cnt: Counter for recovery mode
* @high_curr_cnt: Counter for high current mode
* @init_cnt: Counter for init mode
* @low_bat_cnt Counter for number of consecutive low battery measures
* @nbr_cceoc_irq_cnt Counter for number of CCEOC irqs received since enabled
* @recovery_needed: Indicate if recovery is needed
* @high_curr_mode: Indicate if we're in high current mode
* @init_capacity: Indicate if initial capacity measuring should be done
* @turn_off_fg: True if fg was off before current measurement
* @calib_state State during offset calibration
* @discharge_state: Current discharge state
* @charge_state: Current charge state
* @ab8500_fg_started Completion struct used for the instant current start
* @ab8500_fg_complete Completion struct used for the instant current reading
* @flags: Structure for information about events triggered
* @bat_cap: Structure for battery capacity specific parameters
* @avg_cap: Average capacity filter
* @parent: Pointer to the struct ab8500
* @gpadc: Pointer to the struct gpadc
* @bm: Platform specific battery management information
* @fg_psy: Structure that holds the FG specific battery properties
* @fg_wq: Work queue for running the FG algorithm
* @fg_periodic_work: Work to run the FG algorithm periodically
* @fg_low_bat_work: Work to check low bat condition
* @fg_reinit_work Work used to reset and reinitialise the FG algorithm
* @fg_work: Work to run the FG algorithm instantly
* @fg_acc_cur_work: Work to read the FG accumulator
* @fg_check_hw_failure_work: Work for checking HW state
* @cc_lock: Mutex for locking the CC
* @fg_kobject: Structure of type kobject
*/
struct ab8500_fg {
struct device *dev;
struct list_head node;
int irq;
int vbat;
int vbat_nom;
int inst_curr;
int avg_curr;
int bat_temp;
int fg_samples;
int accu_charge;
int recovery_cnt;
int high_curr_cnt;
int init_cnt;
int low_bat_cnt;
int nbr_cceoc_irq_cnt;
bool recovery_needed;
bool high_curr_mode;
bool init_capacity;
bool turn_off_fg;
enum ab8500_fg_calibration_state calib_state;
enum ab8500_fg_discharge_state discharge_state;
enum ab8500_fg_charge_state charge_state;
struct completion ab8500_fg_started;
struct completion ab8500_fg_complete;
struct ab8500_fg_flags flags;
struct ab8500_fg_battery_capacity bat_cap;
struct ab8500_fg_avg_cap avg_cap;
struct ab8500 *parent;
struct ab8500_gpadc *gpadc;
struct abx500_bm_data *bm;
struct power_supply fg_psy;
struct workqueue_struct *fg_wq;
struct delayed_work fg_periodic_work;
struct delayed_work fg_low_bat_work;
struct delayed_work fg_reinit_work;
struct work_struct fg_work;
struct work_struct fg_acc_cur_work;
struct delayed_work fg_check_hw_failure_work;
struct mutex cc_lock;
struct kobject fg_kobject;
};
static LIST_HEAD(ab8500_fg_list);
/**
* ab8500_fg_get() - returns a reference to the primary AB8500 fuel gauge
* (i.e. the first fuel gauge in the instance list)
*/
struct ab8500_fg *ab8500_fg_get(void)
{
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->bm->fg_params->high_curr_threshold)
return true;
else
return false;
}
/**
* ab8500_fg_add_cap_sample() - Add capacity to average filter
* @di: pointer to the ab8500_fg structure
* @sample: the capacity in mAh to add to the filter
*
* A capacity is added to the filter and a new mean capacity is calculated and
* returned
*/
static int ab8500_fg_add_cap_sample(struct ab8500_fg *di, int sample)
{
struct timespec64 ts64;
struct ab8500_fg_avg_cap *avg = &di->avg_cap;
getnstimeofday64(&ts64);
do {
avg->sum += sample - avg->samples[avg->pos];
avg->samples[avg->pos] = sample;
avg->time_stamps[avg->pos] = ts64.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 (ts64.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 timespec64 ts64;
struct ab8500_fg_avg_cap *avg = &di->avg_cap;
getnstimeofday64(&ts64);
for (i = 0; i < NBR_AVG_SAMPLES; i++) {
avg->samples[i] = sample;
avg->time_stamps[i] = ts64.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_mask_and_set_register_interruptible(di->dev,
AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
(RESET_ACCU | READ_REQ), 0);
if (ret)
goto cc_err;
ret = abx500_set_register_interruptible(di->dev,
AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU_CTRL, 0);
if (ret)
goto cc_err;
/* Stop the CC */
ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
AB8500_RTC_CC_CONF_REG, 0);
if (ret)
goto cc_err;
di->flags.fg_enabled = false;
}
dev_dbg(di->dev, " CC enabled: %d Samples: %d\n",
enable, di->fg_samples);
mutex_unlock(&di->cc_lock);
return ret;
cc_err:
dev_err(di->dev, "%s Enabling coulomb counter failed\n", __func__);
mutex_unlock(&di->cc_lock);
return ret;
}
/**
* ab8500_fg_inst_curr_start() - start battery instantaneous current
* @di: pointer to the ab8500_fg structure
*
* Returns 0 or error code
* Note: This is part "one" and has to be called before
* ab8500_fg_inst_curr_finalize()
*/
int ab8500_fg_inst_curr_start(struct ab8500_fg *di)
{
u8 reg_val;
int ret;
mutex_lock(&di->cc_lock);
di->nbr_cceoc_irq_cnt = 0;
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8500_RTC_CC_CONF_REG, &reg_val);
if (ret < 0)
goto fail;
if (!(reg_val & CC_PWR_UP_ENA)) {
dev_dbg(di->dev, "%s Enable FG\n", __func__);
di->turn_off_fg = true;
/* Program the samples */
ret = abx500_set_register_interruptible(di->dev,
AB8500_GAS_GAUGE, AB8500_GASG_CC_NCOV_ACCU,
SEC_TO_SAMPLE(10));
if (ret)
goto fail;
/* Start the CC */
ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
AB8500_RTC_CC_CONF_REG,
(CC_DEEP_SLEEP_ENA | CC_PWR_UP_ENA));
if (ret)
goto fail;
} else {
di->turn_off_fg = false;
}
/* Return and WFI */
reinit_completion(&di->ab8500_fg_started);
reinit_completion(&di->ab8500_fg_complete);
enable_irq(di->irq);
/* Note: cc_lock is still locked */
return 0;
fail:
mutex_unlock(&di->cc_lock);
return ret;
}
/**
* ab8500_fg_inst_curr_started() - check if fg conversion has started
* @di: pointer to the ab8500_fg structure
*
* Returns 1 if conversion started, 0 if still waiting
*/
int ab8500_fg_inst_curr_started(struct ab8500_fg *di)
{
return completion_done(&di->ab8500_fg_started);
}
/**
* ab8500_fg_inst_curr_done() - check if fg conversion is done
* @di: pointer to the ab8500_fg structure
*
* Returns 1 if conversion done, 0 if still waiting
*/
int ab8500_fg_inst_curr_done(struct ab8500_fg *di)
{
return completion_done(&di->ab8500_fg_complete);
}
/**
* ab8500_fg_inst_curr_finalize() - battery instantaneous current
* @di: pointer to the ab8500_fg structure
* @res: battery instantenous current(on success)
*
* Returns 0 or an error code
* Note: This is part "two" and has to be called at earliest 250 ms
* after ab8500_fg_inst_curr_start()
*/
int ab8500_fg_inst_curr_finalize(struct ab8500_fg *di, int *res)
{
u8 low, high;
int val;
int ret;
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);
di->nbr_cceoc_irq_cnt = 0;
dev_err(di->dev, "completion timed out [%d]\n",
__LINE__);
goto fail;
}
}
disable_irq(di->irq);
di->nbr_cceoc_irq_cnt = 0;
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
READ_REQ, READ_REQ);
/* 100uS between read request and read is needed */
usleep_range(100, 100);
/* Read CC Sample conversion value Low and high */
ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
AB8500_GASG_CC_SMPL_CNVL_REG, &low);
if (ret < 0)
goto fail;
ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
AB8500_GASG_CC_SMPL_CNVH_REG, &high);
if (ret < 0)
goto fail;
/*
* negative value for Discharging
* convert 2's compliment into decimal
*/
if (high & 0x10)
val = (low | (high << 8) | 0xFFFFE000);
else
val = (low | (high << 8));
/*
* Convert to unit value in mA
* Full scale input voltage is
* 63.160mV => LSB = 63.160mV/(4096*res) = 1.542mA
* Given a 250ms conversion cycle time the LSB corresponds
* to 107.1 nAh. Convert to current by dividing by the conversion
* time in hours (250ms = 1 / (3600 * 4)h)
* 107.1nAh assumes 10mOhm, but fg_res is in 0.1mOhm
*/
val = (val * QLSB_NANO_AMP_HOURS_X10 * 36 * 4) /
(1000 * di->bm->fg_res);
if (di->turn_off_fg) {
dev_dbg(di->dev, "%s Disable FG\n", __func__);
/* Clear any pending read requests */
ret = abx500_set_register_interruptible(di->dev,
AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG, 0);
if (ret)
goto fail;
/* Stop the CC */
ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
AB8500_RTC_CC_CONF_REG, 0);
if (ret)
goto fail;
}
mutex_unlock(&di->cc_lock);
(*res) = val;
return 0;
fail:
mutex_unlock(&di->cc_lock);
return ret;
}
/**
* ab8500_fg_inst_curr_blocking() - battery instantaneous current
* @di: pointer to the ab8500_fg structure
* @res: battery instantenous current(on success)
*
* Returns 0 else error code
*/
int ab8500_fg_inst_curr_blocking(struct ab8500_fg *di)
{
int ret;
int timeout;
int res = 0;
ret = ab8500_fg_inst_curr_start(di);
if (ret) {
dev_err(di->dev, "Failed to initialize fg_inst\n");
return 0;
}
/* Wait for CC to actually start */
if (!completion_done(&di->ab8500_fg_started)) {
timeout = wait_for_completion_timeout(
&di->ab8500_fg_started,
INS_CURR_TIMEOUT);
dev_dbg(di->dev, "Start time: %d ms\n",
((INS_CURR_TIMEOUT - timeout) * 1000) / HZ);
if (!timeout) {
ret = -ETIME;
dev_err(di->dev, "completion timed out [%d]\n",
__LINE__);
goto fail;
}
}
ret = ab8500_fg_inst_curr_finalize(di, &res);
if (ret) {
dev_err(di->dev, "Failed to finalize fg_inst\n");
return 0;
}
dev_dbg(di->dev, "%s instant current: %d", __func__, res);
return res;
fail:
disable_irq(di->irq);
mutex_unlock(&di->cc_lock);
return ret;
}
/**
* ab8500_fg_acc_cur_work() - average battery current
* @work: pointer to the work_struct structure
*
* Updated the average battery current obtained from the
* coulomb counter.
*/
static void ab8500_fg_acc_cur_work(struct work_struct *work)
{
int val;
int ret;
u8 low, med, high;
struct ab8500_fg *di = container_of(work,
struct ab8500_fg, fg_acc_cur_work);
mutex_lock(&di->cc_lock);
ret = abx500_set_register_interruptible(di->dev, AB8500_GAS_GAUGE,
AB8500_GASG_CC_NCOV_ACCU_CTRL, RD_NCONV_ACCU_REQ);
if (ret)
goto exit;
ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
AB8500_GASG_CC_NCOV_ACCU_LOW, &low);
if (ret < 0)
goto exit;
ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
AB8500_GASG_CC_NCOV_ACCU_MED, &med);
if (ret < 0)
goto exit;
ret = abx500_get_register_interruptible(di->dev, AB8500_GAS_GAUGE,
AB8500_GASG_CC_NCOV_ACCU_HIGH, &high);
if (ret < 0)
goto exit;
/* Check for sign bit in case of negative value, 2's compliment */
if (high & 0x10)
val = (low | (med << 8) | (high << 16) | 0xFFE00000);
else
val = (low | (med << 8) | (high << 16));
/*
* Convert to uAh
* Given a 250ms conversion cycle time the LSB corresponds
* to 112.9 nAh.
* 112.9nAh assumes 10mOhm, but fg_res is in 0.1mOhm
*/
di->accu_charge = (val * QLSB_NANO_AMP_HOURS_X10) /
(100 * di->bm->fg_res);
/*
* Convert to unit value in mA
* by dividing by the conversion
* time in hours (= samples / (3600 * 4)h)
* and multiply with 1000
*/
di->avg_curr = (val * QLSB_NANO_AMP_HOURS_X10 * 36) /
(1000 * di->bm->fg_res * (di->fg_samples / 4));
di->flags.conv_done = true;
mutex_unlock(&di->cc_lock);
queue_work(di->fg_wq, &di->fg_work);
dev_dbg(di->dev, "fg_res: %d, fg_samples: %d, gasg: %d, accu_charge: %d \n",
di->bm->fg_res, di->fg_samples, val, di->accu_charge);
return;
exit:
dev_err(di->dev,
"Failed to read or write gas gauge registers\n");
mutex_unlock(&di->cc_lock);
queue_work(di->fg_wq, &di->fg_work);
}
/**
* ab8500_fg_bat_voltage() - get battery voltage
* @di: pointer to the ab8500_fg structure
*
* Returns battery voltage(on success) else error code
*/
static int ab8500_fg_bat_voltage(struct ab8500_fg *di)
{
int vbat;
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;
const struct abx500_v_to_cap *tbl;
int cap = 0;
tbl = di->bm->bat_type[di->bm->batt_id].v_to_cap_tbl,
tbl_size = di->bm->bat_type[di->bm->batt_id].n_v_cap_tbl_elements;
for (i = 0; i < tbl_size; ++i) {
if (voltage > tbl[i].voltage)
break;
}
if ((i > 0) && (i < tbl_size)) {
cap = interpolate(voltage,
tbl[i].voltage,
tbl[i].capacity * 10,
tbl[i-1].voltage,
tbl[i-1].capacity * 10);
} else if (i == 0) {
cap = 1000;
} else {
cap = 0;
}
dev_dbg(di->dev, "%s Vbat: %d, Cap: %d per mille",
__func__, voltage, cap);
return cap;
}
/**
* ab8500_fg_uncomp_volt_to_capacity() - Uncompensated voltage based capacity
* @di: pointer to the ab8500_fg structure
*
* Returns battery capacity based on battery voltage that is not compensated
* for the voltage drop due to the load
*/
static int ab8500_fg_uncomp_volt_to_capacity(struct ab8500_fg *di)
{
di->vbat = ab8500_fg_bat_voltage(di);
return ab8500_fg_volt_to_capacity(di, di->vbat);
}
/**
* ab8500_fg_battery_resistance() - Returns the battery inner resistance
* @di: pointer to the ab8500_fg structure
*
* Returns battery inner resistance added with the fuel gauge resistor value
* to get the total resistance in the whole link from gnd to bat+ node.
*/
static int ab8500_fg_battery_resistance(struct ab8500_fg *di)
{
int i, tbl_size;
const struct batres_vs_temp *tbl;
int resist = 0;
tbl = di->bm->bat_type[di->bm->batt_id].batres_tbl;
tbl_size = di->bm->bat_type[di->bm->batt_id].n_batres_tbl_elements;
for (i = 0; i < tbl_size; ++i) {
if (di->bat_temp / 10 > tbl[i].temp)
break;
}
if ((i > 0) && (i < tbl_size)) {
resist = interpolate(di->bat_temp / 10,
tbl[i].temp,
tbl[i].resist,
tbl[i-1].temp,
tbl[i-1].resist);
} else if (i == 0) {
resist = tbl[0].resist;
} else {
resist = tbl[tbl_size - 1].resist;
}
dev_dbg(di->dev, "%s Temp: %d battery internal resistance: %d"
" fg resistance %d, total: %d (mOhm)\n",
__func__, di->bat_temp, resist, di->bm->fg_res / 10,
(di->bm->fg_res / 10) + resist);
/* fg_res variable is in 0.1mOhm */
resist += di->bm->fg_res / 10;
return resist;
}
/**
* ab8500_fg_load_comp_volt_to_capacity() - Load compensated voltage based capacity
* @di: pointer to the ab8500_fg structure
*
* Returns battery capacity based on battery voltage that is load compensated
* for the voltage drop
*/
static int ab8500_fg_load_comp_volt_to_capacity(struct ab8500_fg *di)
{
int vbat_comp, res;
int i = 0;
int vbat = 0;
ab8500_fg_inst_curr_start(di);
do {
vbat += ab8500_fg_bat_voltage(di);
i++;
usleep_range(5000, 6000);
} while (!ab8500_fg_inst_curr_done(di));
ab8500_fg_inst_curr_finalize(di, &di->inst_curr);
di->vbat = vbat / i;
res = ab8500_fg_battery_resistance(di);
/* Use Ohms law to get the load compensated voltage */
vbat_comp = di->vbat - (di->inst_curr * res) / 1000;
dev_dbg(di->dev, "%s Measured Vbat: %dmV,Compensated Vbat %dmV, "
"R: %dmOhm, Current: %dmA Vbat Samples: %d\n",
__func__, di->vbat, vbat_comp, res, di->inst_curr, i);
return ab8500_fg_volt_to_capacity(di, vbat_comp);
}
/**
* ab8500_fg_convert_mah_to_permille() - Capacity in mAh to permille
* @di: pointer to the ab8500_fg structure
* @cap_mah: capacity in mAh
*
* Converts capacity in mAh to capacity in permille
*/
static int ab8500_fg_convert_mah_to_permille(struct ab8500_fg *di, int cap_mah)
{
return (cap_mah * 1000) / di->bat_cap.max_mah_design;
}
/**
* ab8500_fg_convert_permille_to_mah() - Capacity in permille to mAh
* @di: pointer to the ab8500_fg structure
* @cap_pm: capacity in permille
*
* Converts capacity in permille to capacity in mAh
*/
static int ab8500_fg_convert_permille_to_mah(struct ab8500_fg *di, int cap_pm)
{
return cap_pm * di->bat_cap.max_mah_design / 1000;
}
/**
* ab8500_fg_convert_mah_to_uwh() - Capacity in mAh to uWh
* @di: pointer to the ab8500_fg structure
* @cap_mah: capacity in mAh
*
* Converts capacity in mAh to capacity in uWh
*/
static int ab8500_fg_convert_mah_to_uwh(struct ab8500_fg *di, int cap_mah)
{
u64 div_res;
u32 div_rem;
div_res = ((u64) cap_mah) * ((u64) di->vbat_nom);
div_rem = do_div(div_res, 1000);
/* Make sure to round upwards if necessary */
if (div_rem >= 1000 / 2)
div_res++;
return (int) div_res;
}
/**
* ab8500_fg_calc_cap_charging() - Calculate remaining capacity while charging
* @di: pointer to the ab8500_fg structure
*
* Return the capacity in mAh based on previous calculated capcity and the FG
* accumulator register value. The filter is filled with this capacity
*/
static int ab8500_fg_calc_cap_charging(struct ab8500_fg *di)
{
dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
__func__,
di->bat_cap.mah,
di->accu_charge);
/* Capacity should not be less than 0 */
if (di->bat_cap.mah + di->accu_charge > 0)
di->bat_cap.mah += di->accu_charge;
else
di->bat_cap.mah = 0;
/*
* We force capacity to 100% once when the algorithm
* reports that it's full.
*/
if (di->bat_cap.mah >= di->bat_cap.max_mah_design ||
di->flags.force_full) {
di->bat_cap.mah = di->bat_cap.max_mah_design;
}
ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
di->bat_cap.permille =
ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
/* We need to update battery voltage and inst current when charging */
di->vbat = ab8500_fg_bat_voltage(di);
di->inst_curr = ab8500_fg_inst_curr_blocking(di);
return di->bat_cap.mah;
}
/**
* ab8500_fg_calc_cap_discharge_voltage() - Capacity in discharge with voltage
* @di: pointer to the ab8500_fg structure
* @comp: if voltage should be load compensated before capacity calc
*
* Return the capacity in mAh based on the battery voltage. The voltage can
* either be load compensated or not. This value is added to the filter and a
* new mean value is calculated and returned.
*/
static int ab8500_fg_calc_cap_discharge_voltage(struct ab8500_fg *di, bool comp)
{
int permille, mah;
if (comp)
permille = ab8500_fg_load_comp_volt_to_capacity(di);
else
permille = ab8500_fg_uncomp_volt_to_capacity(di);
mah = ab8500_fg_convert_permille_to_mah(di, permille);
di->bat_cap.mah = ab8500_fg_add_cap_sample(di, mah);
di->bat_cap.permille =
ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
return di->bat_cap.mah;
}
/**
* ab8500_fg_calc_cap_discharge_fg() - Capacity in discharge with FG
* @di: pointer to the ab8500_fg structure
*
* Return the capacity in mAh based on previous calculated capcity and the FG
* accumulator register value. This value is added to the filter and a
* new mean value is calculated and returned.
*/
static int ab8500_fg_calc_cap_discharge_fg(struct ab8500_fg *di)
{
int permille_volt, permille;
dev_dbg(di->dev, "%s cap_mah %d accu_charge %d\n",
__func__,
di->bat_cap.mah,
di->accu_charge);
/* Capacity should not be less than 0 */
if (di->bat_cap.mah + di->accu_charge > 0)
di->bat_cap.mah += di->accu_charge;
else
di->bat_cap.mah = 0;
if (di->bat_cap.mah >= di->bat_cap.max_mah_design)
di->bat_cap.mah = di->bat_cap.max_mah_design;
/*
* Check against voltage based capacity. It can not be lower
* than what the uncompensated voltage says
*/
permille = ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
permille_volt = ab8500_fg_uncomp_volt_to_capacity(di);
if (permille < permille_volt) {
di->bat_cap.permille = permille_volt;
di->bat_cap.mah = ab8500_fg_convert_permille_to_mah(di,
di->bat_cap.permille);
dev_dbg(di->dev, "%s voltage based: perm %d perm_volt %d\n",
__func__,
permille,
permille_volt);
ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
} else {
ab8500_fg_fill_cap_sample(di, di->bat_cap.mah);
di->bat_cap.permille =
ab8500_fg_convert_mah_to_permille(di, di->bat_cap.mah);
}
return di->bat_cap.mah;
}
/**
* ab8500_fg_capacity_level() - Get the battery capacity level
* @di: pointer to the ab8500_fg structure
*
* Get the battery capacity level based on the capacity in percent
*/
static int ab8500_fg_capacity_level(struct ab8500_fg *di)
{
int ret, percent;
percent = DIV_ROUND_CLOSEST(di->bat_cap.permille, 10);
if (percent <= di->bm->cap_levels->critical ||
di->flags.low_bat)
ret = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
else if (percent <= di->bm->cap_levels->low)
ret = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
else if (percent <= di->bm->cap_levels->normal)
ret = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
else if (percent <= di->bm->cap_levels->high)
ret = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
else
ret = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
return ret;
}
/**
* ab8500_fg_calculate_scaled_capacity() - Capacity scaling
* @di: pointer to the ab8500_fg structure
*
* Calculates the capacity to be shown to upper layers. Scales the capacity
* to have 100% as a reference from the actual capacity upon removal of charger
* when charging is in maintenance mode.
*/
static int ab8500_fg_calculate_scaled_capacity(struct ab8500_fg *di)
{
struct ab8500_fg_cap_scaling *cs = &di->bat_cap.cap_scale;
int capacity = di->bat_cap.prev_percent;
if (!cs->enable)
return capacity;
/*
* As long as we are in fully charge mode scale the capacity
* to show 100%.
*/
if (di->flags.fully_charged) {
cs->cap_to_scale[0] = 100;
cs->cap_to_scale[1] =
max(capacity, di->bm->fg_params->maint_thres);
dev_dbg(di->dev, "Scale cap with %d/%d\n",
cs->cap_to_scale[0], cs->cap_to_scale[1]);
}
/* Calculates the scaled capacity. */
if ((cs->cap_to_scale[0] != cs->cap_to_scale[1])
&& (cs->cap_to_scale[1] > 0))
capacity = min(100,
DIV_ROUND_CLOSEST(di->bat_cap.prev_percent *
cs->cap_to_scale[0],
cs->cap_to_scale[1]));
if (di->flags.charging) {
if (capacity < cs->disable_cap_level) {
cs->disable_cap_level = capacity;
dev_dbg(di->dev, "Cap to stop scale lowered %d%%\n",
cs->disable_cap_level);
} else if (!di->flags.fully_charged) {
if (di->bat_cap.prev_percent >=
cs->disable_cap_level) {
dev_dbg(di->dev, "Disabling scaled capacity\n");
cs->enable = false;
capacity = di->bat_cap.prev_percent;
} else {
dev_dbg(di->dev,
"Waiting in cap to level %d%%\n",
cs->disable_cap_level);
capacity = cs->disable_cap_level;
}
}
}
return capacity;
}
/**
* ab8500_fg_update_cap_scalers() - Capacity scaling
* @di: pointer to the ab8500_fg structure
*
* To be called when state change from charge<->discharge to update
* the capacity scalers.
*/
static void ab8500_fg_update_cap_scalers(struct ab8500_fg *di)
{
struct ab8500_fg_cap_scaling *cs = &di->bat_cap.cap_scale;
if (!cs->enable)
return;
if (di->flags.charging) {
di->bat_cap.cap_scale.disable_cap_level =
di->bat_cap.cap_scale.scaled_cap;
dev_dbg(di->dev, "Cap to stop scale at charge %d%%\n",
di->bat_cap.cap_scale.disable_cap_level);
} else {
if (cs->scaled_cap != 100) {
cs->cap_to_scale[0] = cs->scaled_cap;
cs->cap_to_scale[1] = di->bat_cap.prev_percent;
} else {
cs->cap_to_scale[0] = 100;
cs->cap_to_scale[1] =
max(di->bat_cap.prev_percent,
di->bm->fg_params->maint_thres);
}
dev_dbg(di->dev, "Cap to scale at discharge %d/%d\n",
cs->cap_to_scale[0], cs->cap_to_scale[1]);
}
}
/**
* ab8500_fg_check_capacity_limits() - Check if capacity has changed
* @di: pointer to the ab8500_fg structure
* @init: capacity is allowed to go up in init mode
*
* Check if capacity or capacity limit has changed and notify the system
* about it using the power_supply framework
*/
static void ab8500_fg_check_capacity_limits(struct ab8500_fg *di, bool init)
{
bool changed = false;
int percent = DIV_ROUND_CLOSEST(di->bat_cap.permille, 10);
di->bat_cap.level = ab8500_fg_capacity_level(di);
if (di->bat_cap.level != di->bat_cap.prev_level) {
/*
* We do not allow reported capacity level to go up
* unless we're charging or if we're in init
*/
if (!(!di->flags.charging && di->bat_cap.level >
di->bat_cap.prev_level) || init) {
dev_dbg(di->dev, "level changed from %d to %d\n",
di->bat_cap.prev_level,
di->bat_cap.level);
di->bat_cap.prev_level = di->bat_cap.level;
changed = true;
} else {
dev_dbg(di->dev, "level not allowed to go up "
"since no charger is connected: %d to %d\n",
di->bat_cap.prev_level,
di->bat_cap.level);
}
}
/*
* If we have received the LOW_BAT IRQ, set capacity to 0 to initiate
* shutdown
*/
if (di->flags.low_bat) {
dev_dbg(di->dev, "Battery low, set capacity to 0\n");
di->bat_cap.prev_percent = 0;
di->bat_cap.permille = 0;
percent = 0;
di->bat_cap.prev_mah = 0;
di->bat_cap.mah = 0;
changed = true;
} else if (di->flags.fully_charged) {
/*
* We report 100% if algorithm reported fully charged
* and show 100% during maintenance charging (scaling).
*/
if (di->flags.force_full) {
di->bat_cap.prev_percent = percent;
di->bat_cap.prev_mah = di->bat_cap.mah;
changed = true;
if (!di->bat_cap.cap_scale.enable &&
di->bm->capacity_scaling) {
di->bat_cap.cap_scale.enable = true;
di->bat_cap.cap_scale.cap_to_scale[0] = 100;
di->bat_cap.cap_scale.cap_to_scale[1] =
di->bat_cap.prev_percent;
di->bat_cap.cap_scale.disable_cap_level = 100;
}
} else if (di->bat_cap.prev_percent != percent) {
dev_dbg(di->dev,
"battery reported full "
"but capacity dropping: %d\n",
percent);
di->bat_cap.prev_percent = percent;
di->bat_cap.prev_mah = di->bat_cap.mah;
changed = true;
}
} else if (di->bat_cap.prev_percent != percent) {
if (percent == 0) {
/*
* We will not report 0% unless we've got
* the LOW_BAT IRQ, no matter what the FG
* algorithm says.
*/
di->bat_cap.prev_percent = 1;
percent = 1;
changed = true;
} else if (!(!di->flags.charging &&
percent > di->bat_cap.prev_percent) || init) {
/*
* We do not allow reported capacity to go up
* unless we're charging or if we're in init
*/
dev_dbg(di->dev,
"capacity changed from %d to %d (%d)\n",
di->bat_cap.prev_percent,
percent,
di->bat_cap.permille);
di->bat_cap.prev_percent = percent;
di->bat_cap.prev_mah = di->bat_cap.mah;
changed = true;
} else {
dev_dbg(di->dev, "capacity not allowed to go up since "
"no charger is connected: %d to %d (%d)\n",
di->bat_cap.prev_percent,
percent,
di->bat_cap.permille);
}
}
if (changed) {
if (di->bm->capacity_scaling) {
di->bat_cap.cap_scale.scaled_cap =
ab8500_fg_calculate_scaled_capacity(di);
dev_info(di->dev, "capacity=%d (%d)\n",
di->bat_cap.prev_percent,
di->bat_cap.cap_scale.scaled_cap);
}
power_supply_changed(&di->fg_psy);
if (di->flags.fully_charged && di->flags.force_full) {
dev_dbg(di->dev, "Battery full, notifying.\n");
di->flags.force_full = false;
sysfs_notify(&di->fg_kobject, NULL, "charge_full");
}
sysfs_notify(&di->fg_kobject, NULL, "charge_now");
}
}
static void ab8500_fg_charge_state_to(struct ab8500_fg *di,
enum ab8500_fg_charge_state new_state)
{
dev_dbg(di->dev, "Charge state from %d [%s] to %d [%s]\n",
di->charge_state,
charge_state[di->charge_state],
new_state,
charge_state[new_state]);
di->charge_state = new_state;
}
static void ab8500_fg_discharge_state_to(struct ab8500_fg *di,
enum ab8500_fg_discharge_state new_state)
{
dev_dbg(di->dev, "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->bm->fg_params->accu_charging);
ab8500_fg_coulomb_counter(di, true);
ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_READOUT);
break;
case AB8500_FG_CHARGE_READOUT:
/*
* Read the FG and calculate the new capacity
*/
mutex_lock(&di->cc_lock);
if (!di->flags.conv_done && !di->flags.force_full) {
/* Wasn't the CC IRQ that got us here */
mutex_unlock(&di->cc_lock);
dev_dbg(di->dev, "%s CC conv not done\n",
__func__);
break;
}
di->flags.conv_done = false;
mutex_unlock(&di->cc_lock);
ab8500_fg_calc_cap_charging(di);
break;
default:
break;
}
/* Check capacity limits */
ab8500_fg_check_capacity_limits(di, false);
}
static void force_capacity(struct ab8500_fg *di)
{
int cap;
ab8500_fg_clear_cap_samples(di);
cap = di->bat_cap.user_mah;
if (cap > di->bat_cap.max_mah_design) {
dev_dbg(di->dev, "Remaining cap %d can't be bigger than total"
" %d\n", cap, di->bat_cap.max_mah_design);
cap = di->bat_cap.max_mah_design;
}
ab8500_fg_fill_cap_sample(di, di->bat_cap.user_mah);
di->bat_cap.permille = ab8500_fg_convert_mah_to_permille(di, cap);
di->bat_cap.mah = cap;
ab8500_fg_check_capacity_limits(di, true);
}
static bool check_sysfs_capacity(struct ab8500_fg *di)
{
int cap, lower, upper;
int cap_permille;
cap = di->bat_cap.user_mah;
cap_permille = ab8500_fg_convert_mah_to_permille(di,
di->bat_cap.user_mah);
lower = di->bat_cap.permille - di->bm->fg_params->user_cap_limit * 10;
upper = di->bat_cap.permille + di->bm->fg_params->user_cap_limit * 10;
if (lower < 0)
lower = 0;
/* 1000 is permille, -> 100 percent */
if (upper > 1000)
upper = 1000;
dev_dbg(di->dev, "Capacity limits:"
" (Lower: %d User: %d Upper: %d) [user: %d, was: %d]\n",
lower, cap_permille, upper, cap, di->bat_cap.mah);
/* If within limits, use the saved capacity and exit estimation...*/
if (cap_permille > lower && cap_permille < upper) {
dev_dbg(di->dev, "OK! Using users cap %d uAh now\n", cap);
force_capacity(di);
return true;
}
dev_dbg(di->dev, "Capacity from user out of limits, ignoring");
return false;
}
/**
* ab8500_fg_algorithm_discharging() - FG algorithm for when discharging
* @di: pointer to the ab8500_fg structure
*
* Battery capacity calculation state machine for when we're discharging
*/
static void ab8500_fg_algorithm_discharging(struct ab8500_fg *di)
{
int sleep_time;
/* If we change to charge mode we should start with init */
if (di->charge_state != AB8500_FG_CHARGE_INIT)
ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
switch (di->discharge_state) {
case AB8500_FG_DISCHARGE_INIT:
/* We use the FG IRQ to work on */
di->init_cnt = 0;
di->fg_samples = SEC_TO_SAMPLE(di->bm->fg_params->init_timer);
ab8500_fg_coulomb_counter(di, true);
ab8500_fg_discharge_state_to(di,
AB8500_FG_DISCHARGE_INITMEASURING);
/* Intentional fallthrough */
case AB8500_FG_DISCHARGE_INITMEASURING:
/*
* Discard a number of samples during startup.
* After that, use compensated voltage for a few
* samples to get an initial capacity.
* Then go to READOUT
*/
sleep_time = di->bm->fg_params->init_timer;
/* Discard the first [x] seconds */
if (di->init_cnt > di->bm->fg_params->init_discard_time) {
ab8500_fg_calc_cap_discharge_voltage(di, true);
ab8500_fg_check_capacity_limits(di, true);
}
di->init_cnt += sleep_time;
if (di->init_cnt > di->bm->fg_params->init_total_time)
ab8500_fg_discharge_state_to(di,
AB8500_FG_DISCHARGE_READOUT_INIT);
break;
case AB8500_FG_DISCHARGE_INIT_RECOVERY:
di->recovery_cnt = 0;
di->recovery_needed = true;
ab8500_fg_discharge_state_to(di,
AB8500_FG_DISCHARGE_RECOVERY);
/* Intentional fallthrough */
case AB8500_FG_DISCHARGE_RECOVERY:
sleep_time = di->bm->fg_params->recovery_sleep_timer;
/*
* We should check the power consumption
* If low, go to READOUT (after x min) or
* RECOVERY_SLEEP if time left.
* If high, go to READOUT
*/
di->inst_curr = ab8500_fg_inst_curr_blocking(di);
if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
if (di->recovery_cnt >
di->bm->fg_params->recovery_total_time) {
di->fg_samples = SEC_TO_SAMPLE(
di->bm->fg_params->accu_high_curr);
ab8500_fg_coulomb_counter(di, true);
ab8500_fg_discharge_state_to(di,
AB8500_FG_DISCHARGE_READOUT);
di->recovery_needed = false;
} else {
queue_delayed_work(di->fg_wq,
&di->fg_periodic_work,
sleep_time * HZ);
}
di->recovery_cnt += sleep_time;
} else {
di->fg_samples = SEC_TO_SAMPLE(
di->bm->fg_params->accu_high_curr);
ab8500_fg_coulomb_counter(di, true);
ab8500_fg_discharge_state_to(di,
AB8500_FG_DISCHARGE_READOUT);
}
break;
case AB8500_FG_DISCHARGE_READOUT_INIT:
di->fg_samples = SEC_TO_SAMPLE(
di->bm->fg_params->accu_high_curr);
ab8500_fg_coulomb_counter(di, true);
ab8500_fg_discharge_state_to(di,
AB8500_FG_DISCHARGE_READOUT);
break;
case AB8500_FG_DISCHARGE_READOUT:
di->inst_curr = ab8500_fg_inst_curr_blocking(di);
if (ab8500_fg_is_low_curr(di, di->inst_curr)) {
/* Detect mode change */
if (di->high_curr_mode) {
di->high_curr_mode = false;
di->high_curr_cnt = 0;
}
if (di->recovery_needed) {
ab8500_fg_discharge_state_to(di,
AB8500_FG_DISCHARGE_INIT_RECOVERY);
queue_delayed_work(di->fg_wq,
&di->fg_periodic_work, 0);
break;
}
ab8500_fg_calc_cap_discharge_voltage(di, true);
} else {
mutex_lock(&di->cc_lock);
if (!di->flags.conv_done) {
/* Wasn't the CC IRQ that got us here */
mutex_unlock(&di->cc_lock);
dev_dbg(di->dev, "%s CC conv not done\n",
__func__);
break;
}
di->flags.conv_done = false;
mutex_unlock(&di->cc_lock);
/* Detect mode change */
if (!di->high_curr_mode) {
di->high_curr_mode = true;
di->high_curr_cnt = 0;
}
di->high_curr_cnt +=
di->bm->fg_params->accu_high_curr;
if (di->high_curr_cnt >
di->bm->fg_params->high_curr_time)
di->recovery_needed = true;
ab8500_fg_calc_cap_discharge_fg(di);
}
ab8500_fg_check_capacity_limits(di, false);
break;
case AB8500_FG_DISCHARGE_WAKEUP:
ab8500_fg_calc_cap_discharge_voltage(di, true);
di->fg_samples = SEC_TO_SAMPLE(
di->bm->fg_params->accu_high_curr);
ab8500_fg_coulomb_counter(di, true);
ab8500_fg_discharge_state_to(di,
AB8500_FG_DISCHARGE_READOUT);
ab8500_fg_check_capacity_limits(di, false);
break;
default:
break;
}
}
/**
* ab8500_fg_algorithm_calibrate() - Internal columb counter offset calibration
* @di: pointer to the ab8500_fg structure
*
*/
static void ab8500_fg_algorithm_calibrate(struct ab8500_fg *di)
{
int ret;
switch (di->calib_state) {
case AB8500_FG_CALIB_INIT:
dev_dbg(di->dev, "Calibration ongoing...\n");
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
CC_INT_CAL_N_AVG_MASK, CC_INT_CAL_SAMPLES_8);
if (ret < 0)
goto err;
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
CC_INTAVGOFFSET_ENA, CC_INTAVGOFFSET_ENA);
if (ret < 0)
goto err;
di->calib_state = AB8500_FG_CALIB_WAIT;
break;
case AB8500_FG_CALIB_END:
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_GAS_GAUGE, AB8500_GASG_CC_CTRL_REG,
CC_MUXOFFSET, CC_MUXOFFSET);
if (ret < 0)
goto err;
di->flags.calibrate = false;
dev_dbg(di->dev, "Calibration done...\n");
queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
break;
case AB8500_FG_CALIB_WAIT:
dev_dbg(di->dev, "Calibration WFI\n");
default:
break;
}
return;
err:
/* Something went wrong, don't calibrate then */
dev_err(di->dev, "failed to calibrate the CC\n");
di->flags.calibrate = false;
di->calib_state = AB8500_FG_CALIB_INIT;
queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
}
/**
* ab8500_fg_algorithm() - Entry point for the FG algorithm
* @di: pointer to the ab8500_fg structure
*
* Entry point for the battery capacity calculation state machine
*/
static void ab8500_fg_algorithm(struct ab8500_fg *di)
{
if (di->flags.calibrate)
ab8500_fg_algorithm_calibrate(di);
else {
if (di->flags.charging)
ab8500_fg_algorithm_charging(di);
else
ab8500_fg_algorithm_discharging(di);
}
dev_dbg(di->dev, "[FG_DATA] %d %d %d %d %d %d %d %d %d %d "
"%d %d %d %d %d %d %d\n",
di->bat_cap.max_mah_design,
di->bat_cap.max_mah,
di->bat_cap.mah,
di->bat_cap.permille,
di->bat_cap.level,
di->bat_cap.prev_mah,
di->bat_cap.prev_percent,
di->bat_cap.prev_level,
di->vbat,
di->inst_curr,
di->avg_curr,
di->accu_charge,
di->flags.charging,
di->charge_state,
di->discharge_state,
di->high_curr_mode,
di->recovery_needed);
}
/**
* ab8500_fg_periodic_work() - Run the FG state machine periodically
* @work: pointer to the work_struct structure
*
* Work queue function for periodic work
*/
static void ab8500_fg_periodic_work(struct work_struct *work)
{
struct ab8500_fg *di = container_of(work, struct ab8500_fg,
fg_periodic_work.work);
if (di->init_capacity) {
/* Get an initial capacity calculation */
ab8500_fg_calc_cap_discharge_voltage(di, true);
ab8500_fg_check_capacity_limits(di, true);
di->init_capacity = false;
queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
} else if (di->flags.user_cap) {
if (check_sysfs_capacity(di)) {
ab8500_fg_check_capacity_limits(di, true);
if (di->flags.charging)
ab8500_fg_charge_state_to(di,
AB8500_FG_CHARGE_INIT);
else
ab8500_fg_discharge_state_to(di,
AB8500_FG_DISCHARGE_READOUT_INIT);
}
di->flags.user_cap = false;
queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
} else
ab8500_fg_algorithm(di);
}
/**
* ab8500_fg_check_hw_failure_work() - Check OVV_BAT condition
* @work: pointer to the work_struct structure
*
* Work queue function for checking the OVV_BAT condition
*/
static void ab8500_fg_check_hw_failure_work(struct work_struct *work)
{
int ret;
u8 reg_value;
struct ab8500_fg *di = container_of(work, struct ab8500_fg,
fg_check_hw_failure_work.work);
/*
* If we have had a battery over-voltage situation,
* check ovv-bit to see if it should be reset.
*/
ret = abx500_get_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_CH_STAT_REG,
&reg_value);
if (ret < 0) {
dev_err(di->dev, "%s ab8500 read failed\n", __func__);
return;
}
if ((reg_value & BATT_OVV) == BATT_OVV) {
if (!di->flags.bat_ovv) {
dev_dbg(di->dev, "Battery OVV\n");
di->flags.bat_ovv = true;
power_supply_changed(&di->fg_psy);
}
/* Not yet recovered from ovv, reschedule this test */
queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work,
HZ);
} else {
dev_dbg(di->dev, "Battery recovered from OVV\n");
di->flags.bat_ovv = false;
power_supply_changed(&di->fg_psy);
}
}
/**
* ab8500_fg_low_bat_work() - Check LOW_BAT condition
* @work: pointer to the work_struct structure
*
* Work queue function for checking the LOW_BAT condition
*/
static void ab8500_fg_low_bat_work(struct work_struct *work)
{
int vbat;
struct ab8500_fg *di = container_of(work, struct ab8500_fg,
fg_low_bat_work.work);
vbat = ab8500_fg_bat_voltage(di);
/* Check if LOW_BAT still fulfilled */
if (vbat < di->bm->fg_params->lowbat_threshold) {
/* Is it time to shut down? */
if (di->low_bat_cnt < 1) {
di->flags.low_bat = true;
dev_warn(di->dev, "Shut down pending...\n");
} else {
/*
* Else we need to re-schedule this check to be able to detect
* if the voltage increases again during charging or
* due to decreasing load.
*/
di->low_bat_cnt--;
dev_warn(di->dev, "Battery voltage still LOW\n");
queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
round_jiffies(LOW_BAT_CHECK_INTERVAL));
}
} else {
di->flags.low_bat_delay = false;
di->low_bat_cnt = 10;
dev_warn(di->dev, "Battery voltage OK again\n");
}
/* This is needed to dispatch LOW_BAT */
ab8500_fg_check_capacity_limits(di, false);
}
/**
* ab8500_fg_battok_calc - calculate the bit pattern corresponding
* to the target voltage.
* @di: pointer to the ab8500_fg structure
* @target target voltage
*
* Returns bit pattern closest to the target voltage
* valid return values are 0-14. (0-BATT_OK_MAX_NR_INCREMENTS)
*/
static int ab8500_fg_battok_calc(struct ab8500_fg *di, int target)
{
if (target > BATT_OK_MIN +
(BATT_OK_INCREMENT * BATT_OK_MAX_NR_INCREMENTS))
return BATT_OK_MAX_NR_INCREMENTS;
if (target < BATT_OK_MIN)
return 0;
return (target - BATT_OK_MIN) / BATT_OK_INCREMENT;
}
/**
* ab8500_fg_battok_init_hw_register - init battok levels
* @di: pointer to the ab8500_fg structure
*
*/
static int ab8500_fg_battok_init_hw_register(struct ab8500_fg *di)
{
int selected;
int sel0;
int sel1;
int cbp_sel0;
int cbp_sel1;
int ret;
int new_val;
sel0 = di->bm->fg_params->battok_falling_th_sel0;
sel1 = di->bm->fg_params->battok_raising_th_sel1;
cbp_sel0 = ab8500_fg_battok_calc(di, sel0);
cbp_sel1 = ab8500_fg_battok_calc(di, sel1);
selected = BATT_OK_MIN + cbp_sel0 * BATT_OK_INCREMENT;
if (selected != sel0)
dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
sel0, selected, cbp_sel0);
selected = BATT_OK_MIN + cbp_sel1 * BATT_OK_INCREMENT;
if (selected != sel1)
dev_warn(di->dev, "Invalid voltage step:%d, using %d %d\n",
sel1, selected, cbp_sel1);
new_val = cbp_sel0 | (cbp_sel1 << 4);
dev_dbg(di->dev, "using: %x %d %d\n", new_val, cbp_sel0, cbp_sel1);
ret = abx500_set_register_interruptible(di->dev, AB8500_SYS_CTRL2_BLOCK,
AB8500_BATT_OK_REG, new_val);
return ret;
}
/**
* ab8500_fg_instant_work() - Run the FG state machine instantly
* @work: pointer to the work_struct structure
*
* Work queue function for instant work
*/
static void ab8500_fg_instant_work(struct work_struct *work)
{
struct ab8500_fg *di = container_of(work, struct ab8500_fg, fg_work);
ab8500_fg_algorithm(di);
}
/**
* ab8500_fg_cc_data_end_handler() - end of data conversion isr.
* @irq: interrupt number
* @_di: pointer to the ab8500_fg structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_fg_cc_data_end_handler(int irq, void *_di)
{
struct ab8500_fg *di = _di;
if (!di->nbr_cceoc_irq_cnt) {
di->nbr_cceoc_irq_cnt++;
complete(&di->ab8500_fg_started);
} else {
di->nbr_cceoc_irq_cnt = 0;
complete(&di->ab8500_fg_complete);
}
return IRQ_HANDLED;
}
/**
* ab8500_fg_cc_int_calib_handler () - end of calibration isr.
* @irq: interrupt number
* @_di: pointer to the ab8500_fg structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_fg_cc_int_calib_handler(int irq, void *_di)
{
struct ab8500_fg *di = _di;
di->calib_state = AB8500_FG_CALIB_END;
queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
return IRQ_HANDLED;
}
/**
* ab8500_fg_cc_convend_handler() - isr to get battery avg current.
* @irq: interrupt number
* @_di: pointer to the ab8500_fg structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_fg_cc_convend_handler(int irq, void *_di)
{
struct ab8500_fg *di = _di;
queue_work(di->fg_wq, &di->fg_acc_cur_work);
return IRQ_HANDLED;
}
/**
* ab8500_fg_batt_ovv_handler() - Battery OVV occured
* @irq: interrupt number
* @_di: pointer to the ab8500_fg structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_fg_batt_ovv_handler(int irq, void *_di)
{
struct ab8500_fg *di = _di;
dev_dbg(di->dev, "Battery OVV\n");
/* Schedule a new HW failure check */
queue_delayed_work(di->fg_wq, &di->fg_check_hw_failure_work, 0);
return IRQ_HANDLED;
}
/**
* ab8500_fg_lowbatf_handler() - Battery voltage is below LOW threshold
* @irq: interrupt number
* @_di: pointer to the ab8500_fg structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_fg_lowbatf_handler(int irq, void *_di)
{
struct ab8500_fg *di = _di;
/* Initiate handling in ab8500_fg_low_bat_work() if not already initiated. */
if (!di->flags.low_bat_delay) {
dev_warn(di->dev, "Battery voltage is below LOW threshold\n");
di->flags.low_bat_delay = true;
/*
* Start a timer to check LOW_BAT again after some time
* This is done to avoid shutdown on single voltage dips
*/
queue_delayed_work(di->fg_wq, &di->fg_low_bat_work,
round_jiffies(LOW_BAT_CHECK_INTERVAL));
}
return IRQ_HANDLED;
}
/**
* ab8500_fg_get_property() - get the fg properties
* @psy: pointer to the power_supply structure
* @psp: pointer to the power_supply_property structure
* @val: pointer to the power_supply_propval union
*
* This function gets called when an application tries to get the
* fg properties by reading the sysfs files.
* voltage_now: battery voltage
* current_now: battery instant current
* current_avg: battery average current
* charge_full_design: capacity where battery is considered full
* charge_now: battery capacity in nAh
* capacity: capacity in percent
* capacity_level: capacity level
*
* Returns error code in case of failure else 0 on success
*/
static int ab8500_fg_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct ab8500_fg *di;
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->bm->chg_unknown_bat &&
di->flags.batt_id_received)
val->intval = ab8500_fg_convert_mah_to_uwh(di,
di->bat_cap.max_mah);
else
val->intval = ab8500_fg_convert_mah_to_uwh(di,
di->bat_cap.prev_mah);
break;
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
val->intval = di->bat_cap.max_mah_design;
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
val->intval = di->bat_cap.max_mah;
break;
case POWER_SUPPLY_PROP_CHARGE_NOW:
if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
di->flags.batt_id_received)
val->intval = di->bat_cap.max_mah;
else
val->intval = di->bat_cap.prev_mah;
break;
case POWER_SUPPLY_PROP_CAPACITY:
if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
di->flags.batt_id_received)
val->intval = 100;
else
val->intval = di->bat_cap.prev_percent;
break;
case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
if (di->flags.batt_unknown && !di->bm->chg_unknown_bat &&
di->flags.batt_id_received)
val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
else
val->intval = di->bat_cap.prev_level;
break;
default:
return -EINVAL;
}
return 0;
}
static int ab8500_fg_get_ext_psy_data(struct device *dev, void *data)
{
struct power_supply *psy;
struct power_supply *ext;
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;
if (di->bm->capacity_scaling)
ab8500_fg_update_cap_scalers(di);
queue_work(di->fg_wq, &di->fg_work);
break;
case POWER_SUPPLY_STATUS_FULL:
if (di->flags.fully_charged)
break;
di->flags.fully_charged = true;
di->flags.force_full = true;
/* Save current capacity as maximum */
di->bat_cap.max_mah = di->bat_cap.mah;
queue_work(di->fg_wq, &di->fg_work);
break;
case POWER_SUPPLY_STATUS_CHARGING:
if (di->flags.charging &&
!di->flags.fully_charged)
break;
di->flags.charging = true;
di->flags.fully_charged = false;
if (di->bm->capacity_scaling)
ab8500_fg_update_cap_scalers(di);
queue_work(di->fg_wq, &di->fg_work);
break;
};
default:
break;
};
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
switch (ext->type) {
case POWER_SUPPLY_TYPE_BATTERY:
if (!di->flags.batt_id_received &&
di->bm->batt_id != BATTERY_UNKNOWN) {
const struct abx500_battery_type *b;
b = &(di->bm->bat_type[di->bm->batt_id]);
di->flags.batt_id_received = true;
di->bat_cap.max_mah_design =
MILLI_TO_MICRO *
b->charge_full_design;
di->bat_cap.max_mah =
di->bat_cap.max_mah_design;
di->vbat_nom = b->nominal_voltage;
}
if (ret.intval)
di->flags.batt_unknown = false;
else
di->flags.batt_unknown = true;
break;
default:
break;
}
break;
case POWER_SUPPLY_PROP_TEMP:
switch (ext->type) {
case POWER_SUPPLY_TYPE_BATTERY:
if (di->flags.batt_id_received)
di->bat_temp = ret.intval;
break;
default:
break;
}
break;
default:
break;
}
}
return 0;
}
/**
* ab8500_fg_init_hw_registers() - Set up FG related registers
* @di: pointer to the ab8500_fg structure
*
* Set up battery OVV, low battery voltage registers
*/
static int ab8500_fg_init_hw_registers(struct ab8500_fg *di)
{
int ret;
/* Set VBAT OVV threshold */
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_CHARGER,
AB8500_BATT_OVV,
BATT_OVV_TH_4P75,
BATT_OVV_TH_4P75);
if (ret) {
dev_err(di->dev, "failed to set BATT_OVV\n");
goto out;
}
/* Enable VBAT OVV detection */
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_CHARGER,
AB8500_BATT_OVV,
BATT_OVV_ENA,
BATT_OVV_ENA);
if (ret) {
dev_err(di->dev, "failed to enable BATT_OVV\n");
goto out;
}
/* Low Battery Voltage */
ret = abx500_set_register_interruptible(di->dev,
AB8500_SYS_CTRL2_BLOCK,
AB8500_LOW_BAT_REG,
ab8500_volt_to_regval(
di->bm->fg_params->lowbat_threshold) << 1 |
LOW_BAT_ENABLE);
if (ret) {
dev_err(di->dev, "%s write failed\n", __func__);
goto out;
}
/* Battery OK threshold */
ret = ab8500_fg_battok_init_hw_register(di);
if (ret) {
dev_err(di->dev, "BattOk init write failed.\n");
goto out;
}
if (((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
abx500_get_chip_id(di->dev) >= AB8500_CUT2P0)
|| is_ab8540(di->parent)) {
ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_MAX_TIME_REG, di->bm->fg_params->pcut_max_time);
if (ret) {
dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_MAX_TIME_REG\n", __func__);
goto out;
};
ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_FLAG_TIME_REG, di->bm->fg_params->pcut_flag_time);
if (ret) {
dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_FLAG_TIME_REG\n", __func__);
goto out;
};
ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_RESTART_REG, di->bm->fg_params->pcut_max_restart);
if (ret) {
dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_RESTART_REG\n", __func__);
goto out;
};
ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_DEBOUNCE_REG, di->bm->fg_params->pcut_debounce_time);
if (ret) {
dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_DEBOUNCE_REG\n", __func__);
goto out;
};
ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_CTL_STATUS_REG, di->bm->fg_params->pcut_enable);
if (ret) {
dev_err(di->dev, "%s write failed AB8505_RTC_PCUT_CTL_STATUS_REG\n", __func__);
goto out;
};
}
out:
return ret;
}
/**
* ab8500_fg_external_power_changed() - callback for power supply changes
* @psy: pointer to the structure power_supply
*
* This function is the entry point of the pointer external_power_changed
* of the structure power_supply.
* This function gets executed when there is a change in any external power
* supply that this driver needs to be notified of.
*/
static void ab8500_fg_external_power_changed(struct power_supply *psy)
{
struct ab8500_fg *di = 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;
ret = kstrtoul(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 = kstrtoul(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;
}
static ssize_t ab8505_powercut_flagtime_read(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_FLAG_TIME_REG, &reg_value);
if (ret < 0) {
dev_err(dev, "Failed to read AB8505_RTC_PCUT_FLAG_TIME_REG\n");
goto fail;
}
return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
fail:
return ret;
}
static ssize_t ab8505_powercut_flagtime_write(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
long unsigned reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
reg_value = simple_strtoul(buf, NULL, 10);
if (reg_value > 0x7F) {
dev_err(dev, "Incorrect parameter, echo 0 (1.98s) - 127 (15.625ms) for flagtime\n");
goto fail;
}
ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_FLAG_TIME_REG, (u8)reg_value);
if (ret < 0)
dev_err(dev, "Failed to set AB8505_RTC_PCUT_FLAG_TIME_REG\n");
fail:
return count;
}
static ssize_t ab8505_powercut_maxtime_read(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_MAX_TIME_REG, &reg_value);
if (ret < 0) {
dev_err(dev, "Failed to read AB8505_RTC_PCUT_MAX_TIME_REG\n");
goto fail;
}
return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
fail:
return ret;
}
static ssize_t ab8505_powercut_maxtime_write(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
int reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
reg_value = simple_strtoul(buf, NULL, 10);
if (reg_value > 0x7F) {
dev_err(dev, "Incorrect parameter, echo 0 (0.0s) - 127 (1.98s) for maxtime\n");
goto fail;
}
ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_MAX_TIME_REG, (u8)reg_value);
if (ret < 0)
dev_err(dev, "Failed to set AB8505_RTC_PCUT_MAX_TIME_REG\n");
fail:
return count;
}
static ssize_t ab8505_powercut_restart_read(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_RESTART_REG, &reg_value);
if (ret < 0) {
dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n");
goto fail;
}
return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0xF));
fail:
return ret;
}
static ssize_t ab8505_powercut_restart_write(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
int reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
reg_value = simple_strtoul(buf, NULL, 10);
if (reg_value > 0xF) {
dev_err(dev, "Incorrect parameter, echo 0 - 15 for number of restart\n");
goto fail;
}
ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_RESTART_REG, (u8)reg_value);
if (ret < 0)
dev_err(dev, "Failed to set AB8505_RTC_PCUT_RESTART_REG\n");
fail:
return count;
}
static ssize_t ab8505_powercut_timer_read(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_TIME_REG, &reg_value);
if (ret < 0) {
dev_err(dev, "Failed to read AB8505_RTC_PCUT_TIME_REG\n");
goto fail;
}
return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7F));
fail:
return ret;
}
static ssize_t ab8505_powercut_restart_counter_read(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_RESTART_REG, &reg_value);
if (ret < 0) {
dev_err(dev, "Failed to read AB8505_RTC_PCUT_RESTART_REG\n");
goto fail;
}
return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0xF0) >> 4);
fail:
return ret;
}
static ssize_t ab8505_powercut_read(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_CTL_STATUS_REG, &reg_value);
if (ret < 0)
goto fail;
return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x1));
fail:
return ret;
}
static ssize_t ab8505_powercut_write(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
int reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
reg_value = simple_strtoul(buf, NULL, 10);
if (reg_value > 0x1) {
dev_err(dev, "Incorrect parameter, echo 0/1 to disable/enable Pcut feature\n");
goto fail;
}
ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_CTL_STATUS_REG, (u8)reg_value);
if (ret < 0)
dev_err(dev, "Failed to set AB8505_RTC_PCUT_CTL_STATUS_REG\n");
fail:
return count;
}
static ssize_t ab8505_powercut_flag_read(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_CTL_STATUS_REG, &reg_value);
if (ret < 0) {
dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n");
goto fail;
}
return scnprintf(buf, PAGE_SIZE, "%d\n", ((reg_value & 0x10) >> 4));
fail:
return ret;
}
static ssize_t ab8505_powercut_debounce_read(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_DEBOUNCE_REG, &reg_value);
if (ret < 0) {
dev_err(dev, "Failed to read AB8505_RTC_PCUT_DEBOUNCE_REG\n");
goto fail;
}
return scnprintf(buf, PAGE_SIZE, "%d\n", (reg_value & 0x7));
fail:
return ret;
}
static ssize_t ab8505_powercut_debounce_write(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
int reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
reg_value = simple_strtoul(buf, NULL, 10);
if (reg_value > 0x7) {
dev_err(dev, "Incorrect parameter, echo 0 to 7 for debounce setting\n");
goto fail;
}
ret = abx500_set_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_DEBOUNCE_REG, (u8)reg_value);
if (ret < 0)
dev_err(dev, "Failed to set AB8505_RTC_PCUT_DEBOUNCE_REG\n");
fail:
return count;
}
static ssize_t ab8505_powercut_enable_status_read(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int ret;
u8 reg_value;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
ret = abx500_get_register_interruptible(di->dev, AB8500_RTC,
AB8505_RTC_PCUT_CTL_STATUS_REG, &reg_value);
if (ret < 0) {
dev_err(dev, "Failed to read AB8505_RTC_PCUT_CTL_STATUS_REG\n");
goto fail;
}
return scnprintf(buf, PAGE_SIZE, "%d\n", ((reg_value & 0x20) >> 5));
fail:
return ret;
}
static struct device_attribute ab8505_fg_sysfs_psy_attrs[] = {
__ATTR(powercut_flagtime, (S_IRUGO | S_IWUSR | S_IWGRP),
ab8505_powercut_flagtime_read, ab8505_powercut_flagtime_write),
__ATTR(powercut_maxtime, (S_IRUGO | S_IWUSR | S_IWGRP),
ab8505_powercut_maxtime_read, ab8505_powercut_maxtime_write),
__ATTR(powercut_restart_max, (S_IRUGO | S_IWUSR | S_IWGRP),
ab8505_powercut_restart_read, ab8505_powercut_restart_write),
__ATTR(powercut_timer, S_IRUGO, ab8505_powercut_timer_read, NULL),
__ATTR(powercut_restart_counter, S_IRUGO,
ab8505_powercut_restart_counter_read, NULL),
__ATTR(powercut_enable, (S_IRUGO | S_IWUSR | S_IWGRP),
ab8505_powercut_read, ab8505_powercut_write),
__ATTR(powercut_flag, S_IRUGO, ab8505_powercut_flag_read, NULL),
__ATTR(powercut_debounce_time, (S_IRUGO | S_IWUSR | S_IWGRP),
ab8505_powercut_debounce_read, ab8505_powercut_debounce_write),
__ATTR(powercut_enable_status, S_IRUGO,
ab8505_powercut_enable_status_read, NULL),
};
static int ab8500_fg_sysfs_psy_create_attrs(struct device *dev)
{
unsigned int i;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
if (((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
abx500_get_chip_id(dev->parent) >= AB8500_CUT2P0)
|| is_ab8540(di->parent)) {
for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++)
if (device_create_file(dev,
&ab8505_fg_sysfs_psy_attrs[i]))
goto sysfs_psy_create_attrs_failed_ab8505;
}
return 0;
sysfs_psy_create_attrs_failed_ab8505:
dev_err(dev, "Failed creating sysfs psy attrs for ab8505.\n");
while (i--)
device_remove_file(dev, &ab8505_fg_sysfs_psy_attrs[i]);
return -EIO;
}
static void ab8500_fg_sysfs_psy_remove_attrs(struct device *dev)
{
unsigned int i;
struct power_supply *psy = dev_get_drvdata(dev);
struct ab8500_fg *di;
di = to_ab8500_fg_device_info(psy);
if (((is_ab8505(di->parent) || is_ab9540(di->parent)) &&
abx500_get_chip_id(dev->parent) >= AB8500_CUT2P0)
|| is_ab8540(di->parent)) {
for (i = 0; i < ARRAY_SIZE(ab8505_fg_sysfs_psy_attrs); i++)
(void)device_remove_file(dev, &ab8505_fg_sysfs_psy_attrs[i]);
}
}
/* Exposure to the sysfs interface <<END>> */
#if defined(CONFIG_PM)
static int ab8500_fg_resume(struct platform_device *pdev)
{
struct ab8500_fg *di = platform_get_drvdata(pdev);
/*
* Change state if we're not charging. If we're charging we will wake
* up on the FG IRQ
*/
if (!di->flags.charging) {
ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_WAKEUP);
queue_work(di->fg_wq, &di->fg_work);
}
return 0;
}
static int ab8500_fg_suspend(struct platform_device *pdev,
pm_message_t state)
{
struct ab8500_fg *di = platform_get_drvdata(pdev);
flush_delayed_work(&di->fg_periodic_work);
flush_work(&di->fg_work);
flush_work(&di->fg_acc_cur_work);
flush_delayed_work(&di->fg_reinit_work);
flush_delayed_work(&di->fg_low_bat_work);
flush_delayed_work(&di->fg_check_hw_failure_work);
/*
* If the FG is enabled we will disable it before going to suspend
* only if we're not charging
*/
if (di->flags.fg_enabled && !di->flags.charging)
ab8500_fg_coulomb_counter(di, false);
return 0;
}
#else
#define ab8500_fg_suspend NULL
#define ab8500_fg_resume NULL
#endif
static int ab8500_fg_remove(struct platform_device *pdev)
{
int ret = 0;
struct ab8500_fg *di = platform_get_drvdata(pdev);
list_del(&di->node);
/* Disable coulomb counter */
ret = ab8500_fg_coulomb_counter(di, false);
if (ret)
dev_err(di->dev, "failed to disable coulomb counter\n");
destroy_workqueue(di->fg_wq);
ab8500_fg_sysfs_exit(di);
flush_scheduled_work();
ab8500_fg_sysfs_psy_remove_attrs(di->fg_psy.dev);
power_supply_unregister(&di->fg_psy);
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 char *supply_interface[] = {
"ab8500_chargalg",
"ab8500_usb",
};
static int ab8500_fg_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct abx500_bm_data *plat = pdev->dev.platform_data;
struct ab8500_fg *di;
int i, irq;
int ret = 0;
di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
if (!di) {
dev_err(&pdev->dev, "%s no mem for ab8500_fg\n", __func__);
return -ENOMEM;
}
if (!plat) {
dev_err(&pdev->dev, "no battery management data supplied\n");
return -EINVAL;
}
di->bm = plat;
if (np) {
ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
if (ret) {
dev_err(&pdev->dev, "failed to get battery information\n");
return ret;
}
}
mutex_init(&di->cc_lock);
/* get parent data */
di->dev = &pdev->dev;
di->parent = dev_get_drvdata(pdev->dev.parent);
di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
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 = supply_interface;
di->fg_psy.num_supplicants = ARRAY_SIZE(supply_interface),
di->fg_psy.external_power_changed = ab8500_fg_external_power_changed;
di->bat_cap.max_mah_design = MILLI_TO_MICRO *
di->bm->bat_type[di->bm->batt_id].charge_full_design;
di->bat_cap.max_mah = di->bat_cap.max_mah_design;
di->vbat_nom = di->bm->bat_type[di->bm->batt_id].nominal_voltage;
di->init_capacity = true;
ab8500_fg_charge_state_to(di, AB8500_FG_CHARGE_INIT);
ab8500_fg_discharge_state_to(di, AB8500_FG_DISCHARGE_INIT);
/* Create a work queue for running the FG algorithm */
di->fg_wq = create_singlethread_workqueue("ab8500_fg_wq");
if (di->fg_wq == NULL) {
dev_err(di->dev, "failed to create work queue\n");
return -ENOMEM;
}
/* Init work for running the fg algorithm instantly */
INIT_WORK(&di->fg_work, ab8500_fg_instant_work);
/* Init work for getting the battery accumulated current */
INIT_WORK(&di->fg_acc_cur_work, ab8500_fg_acc_cur_work);
/* Init work for reinitialising the fg algorithm */
INIT_DEFERRABLE_WORK(&di->fg_reinit_work,
ab8500_fg_reinit_work);
/* Work delayed Queue to run the state machine */
INIT_DEFERRABLE_WORK(&di->fg_periodic_work,
ab8500_fg_periodic_work);
/* Work to check low battery condition */
INIT_DEFERRABLE_WORK(&di->fg_low_bat_work,
ab8500_fg_low_bat_work);
/* Init work for HW failure check */
INIT_DEFERRABLE_WORK(&di->fg_check_hw_failure_work,
ab8500_fg_check_hw_failure_work);
/* Reset battery low voltage flag */
di->flags.low_bat = false;
/* Initialize low battery counter */
di->low_bat_cnt = 10;
/* Initialize OVV, and other registers */
ret = ab8500_fg_init_hw_registers(di);
if (ret) {
dev_err(di->dev, "failed to initialize registers\n");
goto free_inst_curr_wq;
}
/* Consider battery unknown until we're informed otherwise */
di->flags.batt_unknown = true;
di->flags.batt_id_received = false;
/* Register FG power supply class */
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->bm->fg_params->init_timer);
ab8500_fg_coulomb_counter(di, true);
/*
* Initialize completion used to notify completion and start
* of inst current
*/
init_completion(&di->ab8500_fg_started);
init_completion(&di->ab8500_fg_complete);
/* Register 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);
di->nbr_cceoc_irq_cnt = 0;
platform_set_drvdata(pdev, di);
ret = ab8500_fg_sysfs_init(di);
if (ret) {
dev_err(di->dev, "failed to create sysfs entry\n");
goto free_irq;
}
ret = ab8500_fg_sysfs_psy_create_attrs(di->fg_psy.dev);
if (ret) {
dev_err(di->dev, "failed to create FG psy\n");
ab8500_fg_sysfs_exit(di);
goto free_irq;
}
/* Calibrate the fg first time */
di->flags.calibrate = true;
di->calib_state = AB8500_FG_CALIB_INIT;
/* Use room temp as default value until we get an update from driver. */
di->bat_temp = 210;
/* Run the FG algorithm */
queue_delayed_work(di->fg_wq, &di->fg_periodic_work, 0);
list_add_tail(&di->node, &ab8500_fg_list);
return ret;
free_irq:
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);
return ret;
}
static const struct of_device_id ab8500_fg_match[] = {
{ .compatible = "stericsson,ab8500-fg", },
{ },
};
static struct platform_driver ab8500_fg_driver = {
.probe = ab8500_fg_probe,
.remove = ab8500_fg_remove,
.suspend = ab8500_fg_suspend,
.resume = ab8500_fg_resume,
.driver = {
.name = "ab8500-fg",
.of_match_table = ab8500_fg_match,
},
};
static int __init ab8500_fg_init(void)
{
return platform_driver_register(&ab8500_fg_driver);
}
static void __exit ab8500_fg_exit(void)
{
platform_driver_unregister(&ab8500_fg_driver);
}
subsys_initcall_sync(ab8500_fg_init);
module_exit(ab8500_fg_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Johan Palsson, Karl Komierowski");
MODULE_ALIAS("platform:ab8500-fg");
MODULE_DESCRIPTION("AB8500 Fuel Gauge driver");
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