| /* |
| * 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 |
| * @parent: 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 == 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 == 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 == 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 == 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 == 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 == 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); |
| } |
| |
| 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"); |