/* * Copyright (C) ST-Ericsson SA 2012 * * Battery temperature driver for AB8500 * * License Terms: GNU General Public License v2 * Author: * Johan Palsson * Karl Komierowski * Arun R Murthy */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 * @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; } /** * 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, 7uA or 20uA */ 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 (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"); /* 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->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; 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, else we use the 7uA source */ if (di->bm->adc_therm == ABx500_ADC_THERM_BATCTRL && di->bm->batt_id == 1) { 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; struct ab8500_btemp *di = container_of(work, struct ab8500_btemp, btemp_periodic_work.work); if (!di->initialized) { di->initialized = true; /* Identify the battery */ if (ab8500_btemp_id(di) < 0) dev_warn(di->dev, "failed to identify the battery\n"); } 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->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_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->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[] = { {"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 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); return 0; } static char *supply_interface[] = { "ab8500_chargalg", "ab8500_fg", }; 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 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; /* 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 = supply_interface; di->btemp_psy.num_supplicants = ARRAY_SIZE(supply_interface); 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"); 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 */ 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); return ret; } 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", .owner = THIS_MODULE, .of_match_table = ab8500_btemp_match, }, }; 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); } subsys_initcall_sync(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");