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ab8500_btemp.c
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/*
* Copyright (C) ST-Ericsson SA 2012
*
* Battery temperature driver for AB8500
*
* 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/delay.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/completion.h>
#include <linux/workqueue.h>
#include <linux/jiffies.h>
#include <linux/of.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>
#define VTVOUT_V 1800
#define BTEMP_THERMAL_LOW_LIMIT -10
#define BTEMP_THERMAL_MED_LIMIT 0
#define BTEMP_THERMAL_HIGH_LIMIT_52 52
#define BTEMP_THERMAL_HIGH_LIMIT_57 57
#define BTEMP_THERMAL_HIGH_LIMIT_62 62
#define BTEMP_BATCTRL_CURR_SRC_7UA 7
#define BTEMP_BATCTRL_CURR_SRC_20UA 20
#define BTEMP_BATCTRL_CURR_SRC_16UA 16
#define BTEMP_BATCTRL_CURR_SRC_18UA 18
#define BTEMP_BATCTRL_CURR_SRC_60UA 60
#define BTEMP_BATCTRL_CURR_SRC_120UA 120
#define to_ab8500_btemp_device_info(x) container_of((x), \
struct ab8500_btemp, btemp_psy);
/**
* struct ab8500_btemp_interrupts - ab8500 interrupts
* @name: name of the interrupt
* @isr function pointer to the isr
*/
struct ab8500_btemp_interrupts {
char *name;
irqreturn_t (*isr)(int irq, void *data);
};
struct ab8500_btemp_events {
bool batt_rem;
bool btemp_high;
bool btemp_medhigh;
bool btemp_lowmed;
bool btemp_low;
bool ac_conn;
bool usb_conn;
};
struct ab8500_btemp_ranges {
int btemp_high_limit;
int btemp_med_limit;
int btemp_low_limit;
};
/**
* struct ab8500_btemp - ab8500 BTEMP device information
* @dev: Pointer to the structure device
* @node: List of AB8500 BTEMPs, hence prepared for reentrance
* @curr_source: What current source we use, in uA
* @bat_temp: Dispatched battery temperature in degree Celcius
* @prev_bat_temp Last measured battery temperature in degree Celcius
* @parent: Pointer to the struct ab8500
* @gpadc: Pointer to the struct gpadc
* @fg: Pointer to the struct fg
* @bm: Platform specific battery management information
* @btemp_psy: Structure for BTEMP specific battery properties
* @events: Structure for information about events triggered
* @btemp_ranges: Battery temperature range structure
* @btemp_wq: Work queue for measuring the temperature periodically
* @btemp_periodic_work: Work for measuring the temperature periodically
* @initialized: True if battery id read.
*/
struct ab8500_btemp {
struct device *dev;
struct list_head node;
int curr_source;
int bat_temp;
int prev_bat_temp;
struct ab8500 *parent;
struct ab8500_gpadc *gpadc;
struct ab8500_fg *fg;
struct abx500_bm_data *bm;
struct power_supply btemp_psy;
struct ab8500_btemp_events events;
struct ab8500_btemp_ranges btemp_ranges;
struct workqueue_struct *btemp_wq;
struct delayed_work btemp_periodic_work;
bool initialized;
};
/* BTEMP power supply properties */
static enum power_supply_property ab8500_btemp_props[] = {
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_TEMP,
};
static LIST_HEAD(ab8500_btemp_list);
/**
* ab8500_btemp_get() - returns a reference to the primary AB8500 BTEMP
* (i.e. the first BTEMP in the instance list)
*/
struct ab8500_btemp *ab8500_btemp_get(void)
{
struct ab8500_btemp *btemp;
btemp = list_first_entry(&ab8500_btemp_list, struct ab8500_btemp, node);
return btemp;
}
EXPORT_SYMBOL(ab8500_btemp_get);
/**
* ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance
* @di: pointer to the ab8500_btemp structure
* @v_batctrl: measured batctrl voltage
* @inst_curr: measured instant current
*
* This function returns the battery resistance that is
* derived from the BATCTRL voltage.
* Returns value in Ohms.
*/
static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di,
int v_batctrl, int inst_curr)
{
int rbs;
if (is_ab8500_1p1_or_earlier(di->parent)) {
/*
* For ABB cut1.0 and 1.1 BAT_CTRL is internally
* connected to 1.8V through a 450k resistor
*/
return (450000 * (v_batctrl)) / (1800 - v_batctrl);
}
if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL) {
/*
* If the battery has internal NTC, we use the current
* source to calculate the resistance.
*/
rbs = (v_batctrl * 1000
- di->bm->gnd_lift_resistance * inst_curr)
/ di->curr_source;
} else {
/*
* BAT_CTRL is internally
* connected to 1.8V through a 80k resistor
*/
rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl);
}
return rbs;
}
/**
* ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage
* @di: pointer to the ab8500_btemp structure
*
* This function returns the voltage on BATCTRL. Returns value in mV.
*/
static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di)
{
int vbtemp;
static int prev;
vbtemp = ab8500_gpadc_convert(di->gpadc, BAT_CTRL);
if (vbtemp < 0) {
dev_err(di->dev,
"%s gpadc conversion failed, using previous value",
__func__);
return prev;
}
prev = vbtemp;
return vbtemp;
}
/**
* ab8500_btemp_curr_source_enable() - enable/disable batctrl current source
* @di: pointer to the ab8500_btemp structure
* @enable: enable or disable the current source
*
* Enable or disable the current sources for the BatCtrl AD channel
*/
static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di,
bool enable)
{
int curr;
int ret = 0;
/*
* BATCTRL current sources are included on AB8500 cut2.0
* and future versions
*/
if (is_ab8500_1p1_or_earlier(di->parent))
return 0;
/* Only do this for batteries with internal NTC */
if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) {
if (is_ab8540(di->parent)) {
if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_60UA)
curr = BAT_CTRL_60U_ENA;
else
curr = BAT_CTRL_120U_ENA;
} else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_16UA)
curr = BAT_CTRL_16U_ENA;
else
curr = BAT_CTRL_18U_ENA;
} else {
if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA)
curr = BAT_CTRL_7U_ENA;
else
curr = BAT_CTRL_20U_ENA;
}
dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source);
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH);
if (ret) {
dev_err(di->dev, "%s failed setting cmp_force\n",
__func__);
return ret;
}
/*
* We have to wait one 32kHz cycle before enabling
* the current source, since ForceBatCtrlCmpHigh needs
* to be written in a separate cycle
*/
udelay(32);
ret = abx500_set_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
FORCE_BAT_CTRL_CMP_HIGH | curr);
if (ret) {
dev_err(di->dev, "%s failed enabling current source\n",
__func__);
goto disable_curr_source;
}
} else if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) {
dev_dbg(di->dev, "Disable BATCTRL curr source\n");
if (is_ab8540(di->parent)) {
/* Write 0 to the curr bits */
ret = abx500_mask_and_set_register_interruptible(
di->dev,
AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA,
~(BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA));
} else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
/* Write 0 to the curr bits */
ret = abx500_mask_and_set_register_interruptible(
di->dev,
AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA,
~(BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA));
} else {
/* Write 0 to the curr bits */
ret = abx500_mask_and_set_register_interruptible(
di->dev,
AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
}
if (ret) {
dev_err(di->dev, "%s failed disabling current source\n",
__func__);
goto disable_curr_source;
}
/* Enable Pull-Up and comparator */
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
if (ret) {
dev_err(di->dev, "%s failed enabling PU and comp\n",
__func__);
goto enable_pu_comp;
}
/*
* We have to wait one 32kHz cycle before disabling
* ForceBatCtrlCmpHigh since this needs to be written
* in a separate cycle
*/
udelay(32);
/* Disable 'force comparator' */
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
if (ret) {
dev_err(di->dev, "%s failed disabling force comp\n",
__func__);
goto disable_force_comp;
}
}
return ret;
/*
* We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time
* if we got an error above
*/
disable_curr_source:
if (is_ab8540(di->parent)) {
/* Write 0 to the curr bits */
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA,
~(BAT_CTRL_60U_ENA | BAT_CTRL_120U_ENA));
} else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
/* Write 0 to the curr bits */
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA,
~(BAT_CTRL_16U_ENA | BAT_CTRL_18U_ENA));
} else {
/* Write 0 to the curr bits */
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA,
~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA));
}
if (ret) {
dev_err(di->dev, "%s failed disabling current source\n",
__func__);
return ret;
}
enable_pu_comp:
/* Enable Pull-Up and comparator */
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA,
BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA);
if (ret) {
dev_err(di->dev, "%s failed enabling PU and comp\n",
__func__);
return ret;
}
disable_force_comp:
/*
* We have to wait one 32kHz cycle before disabling
* ForceBatCtrlCmpHigh since this needs to be written
* in a separate cycle
*/
udelay(32);
/* Disable 'force comparator' */
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE,
FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH);
if (ret) {
dev_err(di->dev, "%s failed disabling force comp\n",
__func__);
return ret;
}
return ret;
}
/**
* ab8500_btemp_get_batctrl_res() - get battery resistance
* @di: pointer to the ab8500_btemp structure
*
* This function returns the battery pack identification resistance.
* Returns value in Ohms.
*/
static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di)
{
int ret;
int batctrl = 0;
int res;
int inst_curr;
int i;
/*
* BATCTRL current sources are included on AB8500 cut2.0
* and future versions
*/
ret = ab8500_btemp_curr_source_enable(di, true);
if (ret) {
dev_err(di->dev, "%s curr source enabled failed\n", __func__);
return ret;
}
if (!di->fg)
di->fg = ab8500_fg_get();
if (!di->fg) {
dev_err(di->dev, "No fg found\n");
return -EINVAL;
}
ret = ab8500_fg_inst_curr_start(di->fg);
if (ret) {
dev_err(di->dev, "Failed to start current measurement\n");
return ret;
}
do {
msleep(20);
} while (!ab8500_fg_inst_curr_started(di->fg));
i = 0;
do {
batctrl += ab8500_btemp_read_batctrl_voltage(di);
i++;
msleep(20);
} while (!ab8500_fg_inst_curr_done(di->fg));
batctrl /= i;
ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr);
if (ret) {
dev_err(di->dev, "Failed to finalize current measurement\n");
return ret;
}
res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr);
ret = ab8500_btemp_curr_source_enable(di, false);
if (ret) {
dev_err(di->dev, "%s curr source disable failed\n", __func__);
return ret;
}
dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n",
__func__, batctrl, res, inst_curr, i);
return res;
}
/**
* ab8500_btemp_res_to_temp() - resistance to temperature
* @di: pointer to the ab8500_btemp structure
* @tbl: pointer to the resiatance to temperature table
* @tbl_size: size of the resistance to temperature table
* @res: resistance to calculate the temperature from
*
* This function returns the battery temperature in degrees Celcius
* based on the NTC resistance.
*/
static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
const struct abx500_res_to_temp *tbl, int tbl_size, int res)
{
int i, temp;
/*
* Calculate the formula for the straight line
* Simple interpolation if we are within
* the resistance table limits, extrapolate
* if resistance is outside the limits.
*/
if (res > tbl[0].resist)
i = 0;
else if (res <= tbl[tbl_size - 1].resist)
i = tbl_size - 2;
else {
i = 0;
while (!(res <= tbl[i].resist &&
res > tbl[i + 1].resist))
i++;
}
temp = tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) *
(res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
return temp;
}
/**
* ab8500_btemp_measure_temp() - measure battery temperature
* @di: pointer to the ab8500_btemp structure
*
* Returns battery temperature (on success) else the previous temperature
*/
static int ab8500_btemp_measure_temp(struct ab8500_btemp *di)
{
int temp;
static int prev;
int rbat, rntc, vntc;
u8 id;
id = di->bm->batt_id;
if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
id != BATTERY_UNKNOWN) {
rbat = ab8500_btemp_get_batctrl_res(di);
if (rbat < 0) {
dev_err(di->dev, "%s get batctrl res failed\n",
__func__);
/*
* Return out-of-range temperature so that
* charging is stopped
*/
return BTEMP_THERMAL_LOW_LIMIT;
}
temp = ab8500_btemp_res_to_temp(di,
di->bm->bat_type[id].r_to_t_tbl,
di->bm->bat_type[id].n_temp_tbl_elements, rbat);
} else {
vntc = ab8500_gpadc_convert(di->gpadc, BTEMP_BALL);
if (vntc < 0) {
dev_err(di->dev,
"%s gpadc conversion failed,"
" using previous value\n", __func__);
return prev;
}
/*
* The PCB NTC is sourced from VTVOUT via a 230kOhm
* resistor.
*/
rntc = 230000 * vntc / (VTVOUT_V - vntc);
temp = ab8500_btemp_res_to_temp(di,
di->bm->bat_type[id].r_to_t_tbl,
di->bm->bat_type[id].n_temp_tbl_elements, rntc);
prev = temp;
}
dev_dbg(di->dev, "Battery temperature is %d\n", temp);
return temp;
}
/**
* ab8500_btemp_id() - Identify the connected battery
* @di: pointer to the ab8500_btemp structure
*
* This function will try to identify the battery by reading the ID
* resistor. Some brands use a combined ID resistor with a NTC resistor to
* both be able to identify and to read the temperature of it.
*/
static int ab8500_btemp_id(struct ab8500_btemp *di)
{
int res;
u8 i;
if (is_ab8540(di->parent))
di->curr_source = BTEMP_BATCTRL_CURR_SRC_60UA;
else if (is_ab9540(di->parent) || is_ab8505(di->parent))
di->curr_source = BTEMP_BATCTRL_CURR_SRC_16UA;
else
di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
di->bm->batt_id = BATTERY_UNKNOWN;
res = ab8500_btemp_get_batctrl_res(di);
if (res < 0) {
dev_err(di->dev, "%s get batctrl res failed\n", __func__);
return -ENXIO;
}
/* BATTERY_UNKNOWN is defined on position 0, skip it! */
for (i = BATTERY_UNKNOWN + 1; i < di->bm->n_btypes; i++) {
if ((res <= di->bm->bat_type[i].resis_high) &&
(res >= di->bm->bat_type[i].resis_low)) {
dev_dbg(di->dev, "Battery detected on %s"
" low %d < res %d < high: %d"
" index: %d\n",
di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL ?
"BATCTRL" : "BATTEMP",
di->bm->bat_type[i].resis_low, res,
di->bm->bat_type[i].resis_high, i);
di->bm->batt_id = i;
break;
}
}
if (di->bm->batt_id == BATTERY_UNKNOWN) {
dev_warn(di->dev, "Battery identified as unknown"
", resistance %d Ohm\n", res);
return -ENXIO;
}
/*
* We only have to change current source if the
* detected type is Type 1.
*/
if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL &&
di->bm->batt_id == 1) {
if (is_ab8540(di->parent)) {
dev_dbg(di->dev,
"Set BATCTRL current source to 60uA\n");
di->curr_source = BTEMP_BATCTRL_CURR_SRC_60UA;
} else if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
dev_dbg(di->dev,
"Set BATCTRL current source to 16uA\n");
di->curr_source = BTEMP_BATCTRL_CURR_SRC_16UA;
} else {
dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n");
di->curr_source = BTEMP_BATCTRL_CURR_SRC_20UA;
}
}
return di->bm->batt_id;
}
/**
* ab8500_btemp_periodic_work() - Measuring the temperature periodically
* @work: pointer to the work_struct structure
*
* Work function for measuring the temperature periodically
*/
static void ab8500_btemp_periodic_work(struct work_struct *work)
{
int interval;
int bat_temp;
struct ab8500_btemp *di = container_of(work,
struct ab8500_btemp, btemp_periodic_work.work);
if (!di->initialized) {
/* Identify the battery */
if (ab8500_btemp_id(di) < 0)
dev_warn(di->dev, "failed to identify the battery\n");
}
bat_temp = ab8500_btemp_measure_temp(di);
/*
* Filter battery temperature.
* Allow direct updates on temperature only if two samples result in
* same temperature. Else only allow 1 degree change from previous
* reported value in the direction of the new measurement.
*/
if ((bat_temp == di->prev_bat_temp) || !di->initialized) {
if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) {
di->initialized = true;
di->bat_temp = bat_temp;
power_supply_changed(&di->btemp_psy);
}
} else if (bat_temp < di->prev_bat_temp) {
di->bat_temp--;
power_supply_changed(&di->btemp_psy);
} else if (bat_temp > di->prev_bat_temp) {
di->bat_temp++;
power_supply_changed(&di->btemp_psy);
}
di->prev_bat_temp = bat_temp;
if (di->events.ac_conn || di->events.usb_conn)
interval = di->bm->temp_interval_chg;
else
interval = di->bm->temp_interval_nochg;
/* Schedule a new measurement */
queue_delayed_work(di->btemp_wq,
&di->btemp_periodic_work,
round_jiffies(interval * HZ));
}
/**
* ab8500_btemp_batctrlindb_handler() - battery removal detected
* @irq: interrupt number
* @_di: void pointer that has to address of ab8500_btemp
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di)
{
struct ab8500_btemp *di = _di;
dev_err(di->dev, "Battery removal detected!\n");
di->events.batt_rem = true;
power_supply_changed(&di->btemp_psy);
return IRQ_HANDLED;
}
/**
* ab8500_btemp_templow_handler() - battery temp lower than 10 degrees
* @irq: interrupt number
* @_di: void pointer that has to address of ab8500_btemp
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di)
{
struct ab8500_btemp *di = _di;
if (is_ab8500_3p3_or_earlier(di->parent)) {
dev_dbg(di->dev, "Ignore false btemp low irq"
" for ABB cut 1.0, 1.1, 2.0 and 3.3\n");
} else {
dev_crit(di->dev, "Battery temperature lower than -10deg c\n");
di->events.btemp_low = true;
di->events.btemp_high = false;
di->events.btemp_medhigh = false;
di->events.btemp_lowmed = false;
power_supply_changed(&di->btemp_psy);
}
return IRQ_HANDLED;
}
/**
* ab8500_btemp_temphigh_handler() - battery temp higher than max temp
* @irq: interrupt number
* @_di: void pointer that has to address of ab8500_btemp
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di)
{
struct ab8500_btemp *di = _di;
dev_crit(di->dev, "Battery temperature is higher than MAX temp\n");
di->events.btemp_high = true;
di->events.btemp_medhigh = false;
di->events.btemp_lowmed = false;
di->events.btemp_low = false;
power_supply_changed(&di->btemp_psy);
return IRQ_HANDLED;
}
/**
* ab8500_btemp_lowmed_handler() - battery temp between low and medium
* @irq: interrupt number
* @_di: void pointer that has to address of ab8500_btemp
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di)
{
struct ab8500_btemp *di = _di;
dev_dbg(di->dev, "Battery temperature is between low and medium\n");
di->events.btemp_lowmed = true;
di->events.btemp_medhigh = false;
di->events.btemp_high = false;
di->events.btemp_low = false;
power_supply_changed(&di->btemp_psy);
return IRQ_HANDLED;
}
/**
* ab8500_btemp_medhigh_handler() - battery temp between medium and high
* @irq: interrupt number
* @_di: void pointer that has to address of ab8500_btemp
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di)
{
struct ab8500_btemp *di = _di;
dev_dbg(di->dev, "Battery temperature is between medium and high\n");
di->events.btemp_medhigh = true;
di->events.btemp_lowmed = false;
di->events.btemp_high = false;
di->events.btemp_low = false;
power_supply_changed(&di->btemp_psy);
return IRQ_HANDLED;
}
/**
* ab8500_btemp_periodic() - Periodic temperature measurements
* @di: pointer to the ab8500_btemp structure
* @enable: enable or disable periodic temperature measurements
*
* Starts of stops periodic temperature measurements. Periodic measurements
* should only be done when a charger is connected.
*/
static void ab8500_btemp_periodic(struct ab8500_btemp *di,
bool enable)
{
dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n",
enable);
/*
* Make sure a new measurement is done directly by cancelling
* any pending work
*/
cancel_delayed_work_sync(&di->btemp_periodic_work);
if (enable)
queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0);
}
/**
* ab8500_btemp_get_temp() - get battery temperature
* @di: pointer to the ab8500_btemp structure
*
* Returns battery temperature
*/
int ab8500_btemp_get_temp(struct ab8500_btemp *di)
{
int temp = 0;
/*
* The BTEMP events are not reliabe on AB8500 cut3.3
* and prior versions
*/
if (is_ab8500_3p3_or_earlier(di->parent)) {
temp = di->bat_temp * 10;
} else {
if (di->events.btemp_low) {
if (temp > di->btemp_ranges.btemp_low_limit)
temp = di->btemp_ranges.btemp_low_limit * 10;
else
temp = di->bat_temp * 10;
} else if (di->events.btemp_high) {
if (temp < di->btemp_ranges.btemp_high_limit)
temp = di->btemp_ranges.btemp_high_limit * 10;
else
temp = di->bat_temp * 10;
} else if (di->events.btemp_lowmed) {
if (temp > di->btemp_ranges.btemp_med_limit)
temp = di->btemp_ranges.btemp_med_limit * 10;
else
temp = di->bat_temp * 10;
} else if (di->events.btemp_medhigh) {
if (temp < di->btemp_ranges.btemp_med_limit)
temp = di->btemp_ranges.btemp_med_limit * 10;
else
temp = di->bat_temp * 10;
} else
temp = di->bat_temp * 10;
}
return temp;
}
EXPORT_SYMBOL(ab8500_btemp_get_temp);
/**
* ab8500_btemp_get_batctrl_temp() - get the temperature
* @btemp: pointer to the btemp structure
*
* Returns the batctrl temperature in millidegrees
*/
int ab8500_btemp_get_batctrl_temp(struct ab8500_btemp *btemp)
{
return btemp->bat_temp * 1000;
}
EXPORT_SYMBOL(ab8500_btemp_get_batctrl_temp);
/**
* ab8500_btemp_get_property() - get the btemp 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 btemp
* properties by reading the sysfs files.
* online: presence of the battery
* present: presence of the battery
* technology: battery technology
* temp: battery temperature
* Returns error code in case of failure else 0(on success)
*/
static int ab8500_btemp_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct ab8500_btemp *di;
di = to_ab8500_btemp_device_info(psy);
switch (psp) {
case POWER_SUPPLY_PROP_PRESENT:
case POWER_SUPPLY_PROP_ONLINE:
if (di->events.batt_rem)
val->intval = 0;
else
val->intval = 1;
break;
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = di->bm->bat_type[di->bm->batt_id].name;
break;
case POWER_SUPPLY_PROP_TEMP:
val->intval = ab8500_btemp_get_temp(di);
break;
default:
return -EINVAL;
}
return 0;
}
static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data)
{
struct power_supply *psy;
struct power_supply *ext;
struct ab8500_btemp *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_btemp_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_PRESENT:
switch (ext->type) {
case POWER_SUPPLY_TYPE_MAINS:
/* AC disconnected */
if (!ret.intval && di->events.ac_conn) {
di->events.ac_conn = false;
}
/* AC connected */
else if (ret.intval && !di->events.ac_conn) {
di->events.ac_conn = true;
if (!di->events.usb_conn)
ab8500_btemp_periodic(di, true);
}
break;
case POWER_SUPPLY_TYPE_USB:
/* USB disconnected */
if (!ret.intval && di->events.usb_conn) {
di->events.usb_conn = false;
}
/* USB connected */
else if (ret.intval && !di->events.usb_conn) {
di->events.usb_conn = true;
if (!di->events.ac_conn)
ab8500_btemp_periodic(di, true);
}
break;
default:
break;
}
break;
default:
break;
}
}
return 0;
}
/**
* ab8500_btemp_external_power_changed() - callback for power supply changes
* @psy: pointer to the structure power_supply
*
* This function is pointing to the function pointer external_power_changed
* of the structure power_supply.
* This function gets executed when there is a change in the external power
* supply to the btemp.
*/
static void ab8500_btemp_external_power_changed(struct power_supply *psy)
{
struct ab8500_btemp *di = to_ab8500_btemp_device_info(psy);
class_for_each_device(power_supply_class, NULL,
&di->btemp_psy, ab8500_btemp_get_ext_psy_data);
}
/* ab8500 btemp driver interrupts and their respective isr */
static struct ab8500_btemp_interrupts ab8500_btemp_irq[] = {