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Release 4.14 drivers/power/supply/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/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

/**
 * 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 Celsius
 * @prev_bat_temp       Last measured battery temperature in degree Celsius
 * @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) { return list_first_entry(&ab8500_btemp_list, struct ab8500_btemp, node); }

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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; }

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/** * 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; }

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/** * 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; }

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/** * 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; }

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/** * 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 Celsius * 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; /* * 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++; } return tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) * (res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist); }

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/** * 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; }

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/** * 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; }

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/** * 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)); }

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/** * 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; }

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/** * 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; }

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/** * 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; }

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/** * 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; }

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Arun Murthy71100.00%1100.00%
Total71100.00%1100.00%

/** * 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; }

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Arun Murthy71100.00%1100.00%
Total71100.00%1100.00%

/** * 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); }

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Arun Murthy52100.00%1100.00%
Total52100.00%1100.00%

/** * 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; }

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PersonTokensPropCommitsCommitProp
Arun Murthy19995.22%133.33%
Lee Jones83.83%133.33%
Hakan Berg20.96%133.33%
Total209100.00%3100.00%

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; }

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Arun Murthy17100.00%1100.00%
Total17100.00%1100.00%

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 = power_supply_get_drvdata(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; }

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PersonTokensPropCommitsCommitProp
Arun Murthy10395.37%133.33%
Krzysztof Kozlowski32.78%133.33%
Lee Jones21.85%133.33%
Total108100.00%3100.00%


static int ab8500_btemp_get_ext_psy_data(struct device *dev, void *data) { struct power_supply *psy; struct power_supply *ext = dev_get_drvdata(dev); const char **supplicants = (const char **)ext->supplied_to; struct ab8500_btemp *di; union power_supply_propval ret; int j; psy = (struct power_supply *)data; di = power_supply_get_drvdata(psy); /* * For all psy where the name of your driver * appears in any supplied_to */ j = match_string(supplicants, ext->num_supplicants, psy->desc->name); if (j < 0) return 0; /* Go through all properties for the psy */ for (j = 0; j < ext->desc->num_properties; j++) { enum power_supply_property prop; prop = ext->desc->properties[j]; if (power_supply_get_property(ext, prop, &ret)) continue; switch (prop) { case POWER_SUPPLY_PROP_PRESENT: switch (ext->desc->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; }

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PersonTokensPropCommitsCommitProp
Arun Murthy27587.58%125.00%
Andy Shevchenko299.24%125.00%
Krzysztof Kozlowski103.18%250.00%
Total314100.00%4100.00%

/** * 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 = power_supply_get_drvdata(psy); class_for_each_device(power_supply_class, NULL, di->btemp_psy, ab8500_btemp_get_ext_psy_data); }

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Arun Murthy3397.06%150.00%
Krzysztof Kozlowski12.94%150.00%
Total34100.00%2100.00%

/* 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; }

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Arun Murthy31100.00%1100.00%
Total31100.00%1100.00%


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; }

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Arun Murthy34100.00%1100.00%
Total34100.00%1100.00%

#else #define ab8500_btemp_suspend NULL #define ab8500_btemp_resume NULL #endif
static int 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); return 0; }

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Arun Murthy87100.00%1100.00%
Total87100.00%1100.00%

static char *supply_interface[] = { "ab8500_chargalg", "ab8500_fg", }; static const struct power_supply_desc ab8500_btemp_desc = { .name = "ab8500_btemp", .type = POWER_SUPPLY_TYPE_BATTERY, .properties = ab8500_btemp_props, .num_properties = ARRAY_SIZE(ab8500_btemp_props), .get_property = ab8500_btemp_get_property, .external_power_changed = ab8500_btemp_external_power_changed, };
static int ab8500_btemp_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; struct abx500_bm_data *plat = pdev->dev.platform_data; struct power_supply_config psy_cfg = {}; struct ab8500_btemp *di; int irq, i, ret = 0; u8 val; di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL); if (!di) { dev_err(&pdev->dev, "%s no mem for ab8500_btemp\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; } } /* get parent data */ di->dev = &pdev->dev; di->parent = dev_get_drvdata(pdev->dev.parent); di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0"); di->initialized = false; psy_cfg.supplied_to = supply_interface; psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface); psy_cfg.drv_data = di; /* Create a work queue for the btemp */ di->btemp_wq = alloc_workqueue("ab8500_btemp_wq", WQ_MEM_RECLAIM, 0); if (di->btemp_wq == NULL) { dev_err(di->dev, "failed to create work queue\n"); return -ENOMEM; } /* Init work for measuring temperature periodically */ INIT_DEFERRABLE_WORK(&di->btemp_periodic_work, ab8500_btemp_periodic_work); /* 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 */ di->btemp_psy = power_supply_register(di->dev, &ab8500_btemp_desc, &psy_cfg); if (IS_ERR(di->btemp_psy)) { dev_err(di->dev, "failed to register BTEMP psy\n"); ret = PTR_ERR(di->btemp_psy); 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); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Arun Murthy42868.81%18.33%
Rajanikanth H.V8413.50%216.67%
Lee Jones599.49%325.00%
Krzysztof Kozlowski375.95%216.67%
Jonas Aaberg60.96%18.33%
Bhaktipriya Shridhar50.80%18.33%
Julia Lawall20.32%18.33%
Tejun Heo10.16%18.33%
Total622100.00%12100.00%

static const struct of_device_id ab8500_btemp_match[] = { { .compatible = "stericsson,ab8500-btemp", }, { }, }; static struct platform_driver ab8500_btemp_driver = { .probe = ab8500_btemp_probe, .remove = ab8500_btemp_remove, .suspend = ab8500_btemp_suspend, .resume = ab8500_btemp_resume, .driver = { .name = "ab8500-btemp", .of_match_table = ab8500_btemp_match, }, };
static int __init ab8500_btemp_init(void) { return platform_driver_register(&ab8500_btemp_driver); }

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PersonTokensPropCommitsCommitProp
Arun Murthy16100.00%1100.00%
Total16100.00%1100.00%


static void __exit ab8500_btemp_exit(void) { platform_driver_unregister(&ab8500_btemp_driver); }

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Arun Murthy15100.00%1100.00%
Total15100.00%1100.00%

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");

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PersonTokensPropCommitsCommitProp
Arun Murthy359780.43%13.70%
Lee Jones2485.55%518.52%
Michel Jaouen1974.41%13.70%
Rajanikanth H.V1282.86%311.11%
Krzysztof Kozlowski932.08%311.11%
Hakan Berg791.77%27.41%
Jonas Aaberg370.83%13.70%
Andy Shevchenko290.65%13.70%
Johan Bjornstedt190.42%13.70%
Hongbo Zhang150.34%13.70%
Rupesh Kumar100.22%13.70%
Anton Vorontsov60.13%13.70%
Bhaktipriya Shridhar50.11%13.70%
Gustavo A. R. Silva20.04%13.70%
Julia Lawall20.04%13.70%
Marcus Cooper20.04%13.70%
Colin Ian King20.04%13.70%
Tejun Heo10.02%13.70%
Total4472100.00%27100.00%
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