- 根目录:
- drivers
- power
- ab8500_btemp.c
/*
* 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/mfd/abx500/ab8500.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/abx500/ab8500-bm.h>
#include <linux/mfd/abx500/ab8500-gpadc.h>
#include <linux/jiffies.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 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: Battery temperature in degree Celcius
* @prev_bat_temp Last dispatched battery temperature
* : Pointer to the struct ab8500
* @gpadc: Pointer to the struct gpadc
* @fg: Pointer to the struct fg
* @pdata: Pointer to the abx500_btemp platform data
* @bat: Pointer to the abx500_bm platform data
* @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
*/
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_btemp_platform_data *pdata;
struct abx500_bm_data *bat;
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;
};
/* 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;
}
/**
* 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->bat->adc_therm == ABx500_ADC_THERM_BATCTRL) {
/*
* If the battery has internal NTC, we use the current
* source to calculate the resistance, 7uA or 20uA
*/
rbs = (v_batctrl * 1000
- di->bat->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->bat->adc_therm == ABx500_ADC_THERM_BATCTRL && enable) {
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->bat->adc_therm == ABx500_ADC_THERM_BATCTRL && !enable) {
dev_dbg(di->dev, "Disable BATCTRL curr source\n");
/* 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:
/* 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;
}
/*
* Since there is no interrupt when current measurement is done,
* loop for over 250ms (250ms is one sample conversion time
* with 32.768 Khz RTC clock). Note that a stop time must be set
* since the ab8500_btemp_read_batctrl_voltage call can block and
* take an unknown amount of time to complete.
*/
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->bat->batt_id;
if (di->bat->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->bat->bat_type[id].r_to_t_tbl,
di->bat->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->bat->bat_type[id].r_to_t_tbl,
di->bat->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;
di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA;
di->bat->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->bat->n_btypes; i++) {
if ((res <= di->bat->bat_type[i].resis_high) &&
(res >= di->bat->bat_type[i].resis_low)) {
dev_dbg(di->dev, "Battery detected on %s"
" low %d < res %d < high: %d"
" index: %d\n",
di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL ?
"BATCTRL" : "BATTEMP",
di->bat->bat_type[i].resis_low, res,
di->bat->bat_type[i].resis_high, i);
di->bat->batt_id = i;
break;
}
}
if (di->bat->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, else we use the 7uA source
*/
if (di->bat->adc_therm == ABx500_ADC_THERM_BATCTRL &&
di->bat->batt_id == 1) {
dev_dbg(di->dev, "Set BATCTRL current source to 20uA\n");
di->curr_source = BTEMP_BATCTRL_CURR_SRC_20UA;
}
return di->bat->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;
struct ab8500_btemp *di = container_of(work,
struct ab8500_btemp, btemp_periodic_work.work);
di->bat_temp = ab8500_btemp_measure_temp(di);
if (di->bat_temp != di->prev_bat_temp) {
di->prev_bat_temp = di->bat_temp;
power_supply_changed(&di->btemp_psy);
}
if (di->events.ac_conn || di->events.usb_conn)
interval = di->bat->temp_interval_chg;
else
interval = di->bat->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_2p0_or_earlier(di->parent)) {
dev_dbg(di->dev, "Ignore false btemp low irq"
" for ABB cut 1.0, 1.1 and 2.0\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
*/
static int ab8500_btemp_get_temp(struct ab8500_btemp *di)
{
int temp = 0;
/*
* The BTEMP events are not reliabe on AB8500 cut2.0
* and prior versions
*/
if (is_ab8500_2p0_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;
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;
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;
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;
else
temp = di->bat_temp * 10;
} else
temp = di->bat_temp * 10;
}
return 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;
}
/**
* 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->bat->bat_type[di->bat->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[] = {
{"BAT_CTRL_INDB", ab8500_btemp_batctrlindb_handler},
{"BTEMP_LOW", ab8500_btemp_templow_handler},
{"BTEMP_HIGH", ab8500_btemp_temphigh_handler},
{"BTEMP_LOW_MEDIUM", ab8500_btemp_lowmed_handler},
{"BTEMP_MEDIUM_HIGH", ab8500_btemp_medhigh_handler},
};
#if defined(CONFIG_PM)
static int ab8500_btemp_resume(struct platform_device *pdev)
{
struct ab8500_btemp *di = platform_get_drvdata(pdev);
ab8500_btemp_periodic(di, true);
return 0;
}
static int ab8500_btemp_suspend(struct platform_device *pdev,
pm_message_t state)
{
struct ab8500_btemp *di = platform_get_drvdata(pdev);
ab8500_btemp_periodic(di, false);
return 0;
}
#else
#define ab8500_btemp_suspend NULL
#define ab8500_btemp_resume NULL
#endif
static int __devexit ab8500_btemp_remove(struct platform_device *pdev)
{
struct ab8500_btemp *di = platform_get_drvdata(pdev);
int i, irq;
/* Disable interrupts */
for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
free_irq(irq, di);
}
/* Delete the work queue */
destroy_workqueue(di->btemp_wq);
flush_scheduled_work();
power_supply_unregister(&di->btemp_psy);
platform_set_drvdata(pdev, NULL);
kfree(di);
return 0;
}
static int __devinit ab8500_btemp_probe(struct platform_device *pdev)
{
int irq, i, ret = 0;
u8 val;
struct abx500_bm_plat_data *plat_data;
struct ab8500_btemp *di =
kzalloc(sizeof(struct ab8500_btemp), GFP_KERNEL);
if (!di)
return -ENOMEM;
/* get parent data */
di->dev = &pdev->dev;
di->parent = dev_get_drvdata(pdev->dev.parent);
di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
/* get btemp specific platform data */
plat_data = pdev->dev.platform_data;
di->pdata = plat_data->btemp;
if (!di->pdata) {
dev_err(di->dev, "no btemp platform data supplied\n");
ret = -EINVAL;
goto free_device_info;
}
/* get battery specific platform data */
di->bat = plat_data->battery;
if (!di->bat) {
dev_err(di->dev, "no battery platform data supplied\n");
ret = -EINVAL;
goto free_device_info;
}
/* BTEMP supply */
di->btemp_psy.name = "ab8500_btemp";
di->btemp_psy.type = POWER_SUPPLY_TYPE_BATTERY;
di->btemp_psy.properties = ab8500_btemp_props;
di->btemp_psy.num_properties = ARRAY_SIZE(ab8500_btemp_props);
di->btemp_psy.get_property = ab8500_btemp_get_property;
di->btemp_psy.supplied_to = di->pdata->supplied_to;
di->btemp_psy.num_supplicants = di->pdata->num_supplicants;
di->btemp_psy.external_power_changed =
ab8500_btemp_external_power_changed;
/* Create a work queue for the btemp */
di->btemp_wq =
create_singlethread_workqueue("ab8500_btemp_wq");
if (di->btemp_wq == NULL) {
dev_err(di->dev, "failed to create work queue\n");
goto free_device_info;
}
/* Init work for measuring temperature periodically */
INIT_DELAYED_WORK_DEFERRABLE(&di->btemp_periodic_work,
ab8500_btemp_periodic_work);
/* Identify the battery */
if (ab8500_btemp_id(di) < 0)
dev_warn(di->dev, "failed to identify the battery\n");
/* Set BTEMP thermal limits. Low and Med are fixed */
di->btemp_ranges.btemp_low_limit = BTEMP_THERMAL_LOW_LIMIT;
di->btemp_ranges.btemp_med_limit = BTEMP_THERMAL_MED_LIMIT;
ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_BTEMP_HIGH_TH, &val);
if (ret < 0) {
dev_err(di->dev, "%s ab8500 read failed\n", __func__);
goto free_btemp_wq;
}
switch (val) {
case BTEMP_HIGH_TH_57_0:
case BTEMP_HIGH_TH_57_1:
di->btemp_ranges.btemp_high_limit =
BTEMP_THERMAL_HIGH_LIMIT_57;
break;
case BTEMP_HIGH_TH_52:
di->btemp_ranges.btemp_high_limit =
BTEMP_THERMAL_HIGH_LIMIT_52;
break;
case BTEMP_HIGH_TH_62:
di->btemp_ranges.btemp_high_limit =
BTEMP_THERMAL_HIGH_LIMIT_62;
break;
}
/* Register BTEMP power supply class */
ret = power_supply_register(di->dev, &di->btemp_psy);
if (ret) {
dev_err(di->dev, "failed to register BTEMP psy\n");
goto free_btemp_wq;
}
/* Register interrupts */
for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) {
irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
ret = request_threaded_irq(irq, NULL, ab8500_btemp_irq[i].isr,
IRQF_SHARED | IRQF_NO_SUSPEND,
ab8500_btemp_irq[i].name, di);
if (ret) {
dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
, ab8500_btemp_irq[i].name, irq, ret);
goto free_irq;
}
dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
ab8500_btemp_irq[i].name, irq, ret);
}
platform_set_drvdata(pdev, di);
/* Kick off periodic temperature measurements */
ab8500_btemp_periodic(di, true);
list_add_tail(&di->node, &ab8500_btemp_list);
return ret;
free_irq:
power_supply_unregister(&di->btemp_psy);
/* We also have to free all successfully registered irqs */
for (i = i - 1; i >= 0; i--) {
irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name);
free_irq(irq, di);
}
free_btemp_wq:
destroy_workqueue(di->btemp_wq);
free_device_info:
kfree(di);
return ret;
}
static struct platform_driver ab8500_btemp_driver = {
.probe = ab8500_btemp_probe,
.remove = __devexit_p(ab8500_btemp_remove),
.suspend = ab8500_btemp_suspend,
.resume = ab8500_btemp_resume,
.driver = {
.name = "ab8500-btemp",
.owner = THIS_MODULE,
},
};
static int __init ab8500_btemp_init(void)
{
return platform_driver_register(&ab8500_btemp_driver);
}
static void __exit ab8500_btemp_exit(void)
{
platform_driver_unregister(&ab8500_btemp_driver);
}
device_initcall(ab8500_btemp_init);
module_exit(ab8500_btemp_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
MODULE_ALIAS("platform:ab8500-btemp");
MODULE_DESCRIPTION("AB8500 battery temperature driver");