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1116 lines
29 KiB
1116 lines
29 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) ST-Ericsson SA 2012 |
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* |
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* Battery temperature driver for AB8500 |
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* |
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* Author: |
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* Johan Palsson <[email protected]> |
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* Karl Komierowski <[email protected]> |
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* Arun R Murthy <[email protected]> |
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*/ |
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|
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/device.h> |
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#include <linux/component.h> |
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#include <linux/interrupt.h> |
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#include <linux/delay.h> |
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#include <linux/slab.h> |
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#include <linux/platform_device.h> |
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#include <linux/power_supply.h> |
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#include <linux/completion.h> |
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#include <linux/workqueue.h> |
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#include <linux/jiffies.h> |
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#include <linux/of.h> |
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#include <linux/mfd/core.h> |
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#include <linux/mfd/abx500.h> |
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#include <linux/mfd/abx500/ab8500.h> |
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#include <linux/iio/consumer.h> |
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#include <linux/fixp-arith.h> |
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|
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#include "ab8500-bm.h" |
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|
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#define VTVOUT_V 1800 |
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|
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#define BTEMP_THERMAL_LOW_LIMIT -10 |
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#define BTEMP_THERMAL_MED_LIMIT 0 |
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#define BTEMP_THERMAL_HIGH_LIMIT_52 52 |
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#define BTEMP_THERMAL_HIGH_LIMIT_57 57 |
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#define BTEMP_THERMAL_HIGH_LIMIT_62 62 |
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|
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#define BTEMP_BATCTRL_CURR_SRC_7UA 7 |
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#define BTEMP_BATCTRL_CURR_SRC_20UA 20 |
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|
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#define BTEMP_BATCTRL_CURR_SRC_16UA 16 |
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#define BTEMP_BATCTRL_CURR_SRC_18UA 18 |
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|
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#define BTEMP_BATCTRL_CURR_SRC_60UA 60 |
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#define BTEMP_BATCTRL_CURR_SRC_120UA 120 |
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|
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/** |
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* struct ab8500_btemp_interrupts - ab8500 interrupts |
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* @name: name of the interrupt |
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* @isr function pointer to the isr |
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*/ |
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struct ab8500_btemp_interrupts { |
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char *name; |
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irqreturn_t (*isr)(int irq, void *data); |
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}; |
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|
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struct ab8500_btemp_events { |
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bool batt_rem; |
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bool btemp_high; |
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bool btemp_medhigh; |
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bool btemp_lowmed; |
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bool btemp_low; |
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bool ac_conn; |
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bool usb_conn; |
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}; |
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|
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struct ab8500_btemp_ranges { |
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int btemp_high_limit; |
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int btemp_med_limit; |
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int btemp_low_limit; |
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}; |
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|
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/** |
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* struct ab8500_btemp - ab8500 BTEMP device information |
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* @dev: Pointer to the structure device |
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* @node: List of AB8500 BTEMPs, hence prepared for reentrance |
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* @curr_source: What current source we use, in uA |
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* @bat_temp: Dispatched battery temperature in degree Celsius |
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* @prev_bat_temp Last measured battery temperature in degree Celsius |
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* @parent: Pointer to the struct ab8500 |
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* @adc_btemp_ball: ADC channel for the battery ball temperature |
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* @adc_bat_ctrl: ADC channel for the battery control |
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* @fg: Pointer to the struct fg |
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* @bm: Platform specific battery management information |
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* @btemp_psy: Structure for BTEMP specific battery properties |
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* @events: Structure for information about events triggered |
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* @btemp_ranges: Battery temperature range structure |
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* @btemp_wq: Work queue for measuring the temperature periodically |
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* @btemp_periodic_work: Work for measuring the temperature periodically |
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* @initialized: True if battery id read. |
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*/ |
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struct ab8500_btemp { |
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struct device *dev; |
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struct list_head node; |
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int curr_source; |
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int bat_temp; |
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int prev_bat_temp; |
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struct ab8500 *parent; |
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struct iio_channel *btemp_ball; |
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struct iio_channel *bat_ctrl; |
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struct ab8500_fg *fg; |
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struct ab8500_bm_data *bm; |
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struct power_supply *btemp_psy; |
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struct ab8500_btemp_events events; |
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struct ab8500_btemp_ranges btemp_ranges; |
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struct workqueue_struct *btemp_wq; |
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struct delayed_work btemp_periodic_work; |
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bool initialized; |
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}; |
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|
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/* BTEMP power supply properties */ |
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static enum power_supply_property ab8500_btemp_props[] = { |
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POWER_SUPPLY_PROP_PRESENT, |
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POWER_SUPPLY_PROP_ONLINE, |
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POWER_SUPPLY_PROP_TECHNOLOGY, |
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POWER_SUPPLY_PROP_TEMP, |
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}; |
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|
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static LIST_HEAD(ab8500_btemp_list); |
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|
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/** |
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* ab8500_btemp_batctrl_volt_to_res() - convert batctrl voltage to resistance |
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* @di: pointer to the ab8500_btemp structure |
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* @v_batctrl: measured batctrl voltage |
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* @inst_curr: measured instant current |
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* |
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* This function returns the battery resistance that is |
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* derived from the BATCTRL voltage. |
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* Returns value in Ohms. |
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*/ |
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static int ab8500_btemp_batctrl_volt_to_res(struct ab8500_btemp *di, |
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int v_batctrl, int inst_curr) |
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{ |
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int rbs; |
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|
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if (is_ab8500_1p1_or_earlier(di->parent)) { |
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/* |
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* For ABB cut1.0 and 1.1 BAT_CTRL is internally |
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* connected to 1.8V through a 450k resistor |
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*/ |
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return (450000 * (v_batctrl)) / (1800 - v_batctrl); |
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} |
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|
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if (di->bm->adc_therm == AB8500_ADC_THERM_BATCTRL) { |
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/* |
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* If the battery has internal NTC, we use the current |
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* source to calculate the resistance. |
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*/ |
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rbs = (v_batctrl * 1000 |
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- di->bm->gnd_lift_resistance * inst_curr) |
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/ di->curr_source; |
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} else { |
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/* |
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* BAT_CTRL is internally |
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* connected to 1.8V through a 80k resistor |
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*/ |
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rbs = (80000 * (v_batctrl)) / (1800 - v_batctrl); |
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} |
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|
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return rbs; |
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} |
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|
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/** |
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* ab8500_btemp_read_batctrl_voltage() - measure batctrl voltage |
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* @di: pointer to the ab8500_btemp structure |
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* |
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* This function returns the voltage on BATCTRL. Returns value in mV. |
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*/ |
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static int ab8500_btemp_read_batctrl_voltage(struct ab8500_btemp *di) |
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{ |
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int vbtemp, ret; |
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static int prev; |
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ret = iio_read_channel_processed(di->bat_ctrl, &vbtemp); |
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if (ret < 0) { |
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dev_err(di->dev, |
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"%s ADC conversion failed, using previous value", |
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__func__); |
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return prev; |
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} |
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prev = vbtemp; |
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return vbtemp; |
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} |
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/** |
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* ab8500_btemp_curr_source_enable() - enable/disable batctrl current source |
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* @di: pointer to the ab8500_btemp structure |
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* @enable: enable or disable the current source |
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* |
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* Enable or disable the current sources for the BatCtrl AD channel |
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*/ |
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static int ab8500_btemp_curr_source_enable(struct ab8500_btemp *di, |
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bool enable) |
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{ |
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int curr; |
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int ret = 0; |
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|
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/* |
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* BATCTRL current sources are included on AB8500 cut2.0 |
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* and future versions |
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*/ |
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if (is_ab8500_1p1_or_earlier(di->parent)) |
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return 0; |
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|
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/* Only do this for batteries with internal NTC */ |
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if (di->bm->adc_therm == AB8500_ADC_THERM_BATCTRL && enable) { |
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if (di->curr_source == BTEMP_BATCTRL_CURR_SRC_7UA) |
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curr = BAT_CTRL_7U_ENA; |
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else |
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curr = BAT_CTRL_20U_ENA; |
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dev_dbg(di->dev, "Set BATCTRL %duA\n", di->curr_source); |
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ret = abx500_mask_and_set_register_interruptible(di->dev, |
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AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, |
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FORCE_BAT_CTRL_CMP_HIGH, FORCE_BAT_CTRL_CMP_HIGH); |
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if (ret) { |
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dev_err(di->dev, "%s failed setting cmp_force\n", |
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__func__); |
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return ret; |
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} |
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|
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/* |
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* We have to wait one 32kHz cycle before enabling |
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* the current source, since ForceBatCtrlCmpHigh needs |
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* to be written in a separate cycle |
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*/ |
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udelay(32); |
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|
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ret = abx500_set_register_interruptible(di->dev, |
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AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, |
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FORCE_BAT_CTRL_CMP_HIGH | curr); |
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if (ret) { |
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dev_err(di->dev, "%s failed enabling current source\n", |
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__func__); |
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goto disable_curr_source; |
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} |
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} else if (di->bm->adc_therm == AB8500_ADC_THERM_BATCTRL && !enable) { |
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dev_dbg(di->dev, "Disable BATCTRL curr source\n"); |
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|
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/* Write 0 to the curr bits */ |
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ret = abx500_mask_and_set_register_interruptible( |
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di->dev, |
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AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, |
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BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA, |
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~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA)); |
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if (ret) { |
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dev_err(di->dev, "%s failed disabling current source\n", |
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__func__); |
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goto disable_curr_source; |
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} |
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/* Enable Pull-Up and comparator */ |
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ret = abx500_mask_and_set_register_interruptible(di->dev, |
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AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, |
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BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA, |
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BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA); |
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if (ret) { |
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dev_err(di->dev, "%s failed enabling PU and comp\n", |
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__func__); |
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goto enable_pu_comp; |
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} |
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/* |
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* We have to wait one 32kHz cycle before disabling |
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* ForceBatCtrlCmpHigh since this needs to be written |
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* in a separate cycle |
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*/ |
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udelay(32); |
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|
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/* Disable 'force comparator' */ |
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ret = abx500_mask_and_set_register_interruptible(di->dev, |
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AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, |
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FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH); |
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if (ret) { |
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dev_err(di->dev, "%s failed disabling force comp\n", |
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__func__); |
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goto disable_force_comp; |
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} |
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} |
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return ret; |
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/* |
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* We have to try unsetting FORCE_BAT_CTRL_CMP_HIGH one more time |
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* if we got an error above |
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*/ |
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disable_curr_source: |
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/* Write 0 to the curr bits */ |
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ret = abx500_mask_and_set_register_interruptible(di->dev, |
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AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, |
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BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA, |
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~(BAT_CTRL_7U_ENA | BAT_CTRL_20U_ENA)); |
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if (ret) { |
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dev_err(di->dev, "%s failed disabling current source\n", |
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__func__); |
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return ret; |
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} |
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enable_pu_comp: |
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/* Enable Pull-Up and comparator */ |
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ret = abx500_mask_and_set_register_interruptible(di->dev, |
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AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, |
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BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA, |
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BAT_CTRL_PULL_UP_ENA | BAT_CTRL_CMP_ENA); |
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if (ret) { |
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dev_err(di->dev, "%s failed enabling PU and comp\n", |
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__func__); |
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return ret; |
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} |
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disable_force_comp: |
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/* |
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* We have to wait one 32kHz cycle before disabling |
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* ForceBatCtrlCmpHigh since this needs to be written |
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* in a separate cycle |
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*/ |
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udelay(32); |
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|
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/* Disable 'force comparator' */ |
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ret = abx500_mask_and_set_register_interruptible(di->dev, |
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AB8500_CHARGER, AB8500_BAT_CTRL_CURRENT_SOURCE, |
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FORCE_BAT_CTRL_CMP_HIGH, ~FORCE_BAT_CTRL_CMP_HIGH); |
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if (ret) { |
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dev_err(di->dev, "%s failed disabling force comp\n", |
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__func__); |
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return ret; |
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} |
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|
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return ret; |
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} |
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|
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/** |
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* ab8500_btemp_get_batctrl_res() - get battery resistance |
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* @di: pointer to the ab8500_btemp structure |
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* |
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* This function returns the battery pack identification resistance. |
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* Returns value in Ohms. |
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*/ |
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static int ab8500_btemp_get_batctrl_res(struct ab8500_btemp *di) |
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{ |
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int ret; |
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int batctrl = 0; |
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int res; |
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int inst_curr; |
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int i; |
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|
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/* |
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* BATCTRL current sources are included on AB8500 cut2.0 |
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* and future versions |
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*/ |
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ret = ab8500_btemp_curr_source_enable(di, true); |
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if (ret) { |
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dev_err(di->dev, "%s curr source enabled failed\n", __func__); |
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return ret; |
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} |
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|
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if (!di->fg) |
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di->fg = ab8500_fg_get(); |
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if (!di->fg) { |
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dev_err(di->dev, "No fg found\n"); |
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return -EINVAL; |
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} |
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|
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ret = ab8500_fg_inst_curr_start(di->fg); |
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|
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if (ret) { |
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dev_err(di->dev, "Failed to start current measurement\n"); |
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return ret; |
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} |
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do { |
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msleep(20); |
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} while (!ab8500_fg_inst_curr_started(di->fg)); |
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i = 0; |
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do { |
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batctrl += ab8500_btemp_read_batctrl_voltage(di); |
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i++; |
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msleep(20); |
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} while (!ab8500_fg_inst_curr_done(di->fg)); |
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batctrl /= i; |
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|
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ret = ab8500_fg_inst_curr_finalize(di->fg, &inst_curr); |
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if (ret) { |
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dev_err(di->dev, "Failed to finalize current measurement\n"); |
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return ret; |
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} |
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res = ab8500_btemp_batctrl_volt_to_res(di, batctrl, inst_curr); |
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|
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ret = ab8500_btemp_curr_source_enable(di, false); |
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if (ret) { |
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dev_err(di->dev, "%s curr source disable failed\n", __func__); |
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return ret; |
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} |
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dev_dbg(di->dev, "%s batctrl: %d res: %d inst_curr: %d samples: %d\n", |
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__func__, batctrl, res, inst_curr, i); |
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|
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return res; |
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} |
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|
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/** |
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* ab8500_btemp_res_to_temp() - resistance to temperature |
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* @di: pointer to the ab8500_btemp structure |
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* @tbl: pointer to the resiatance to temperature table |
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* @tbl_size: size of the resistance to temperature table |
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* @res: resistance to calculate the temperature from |
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* |
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* This function returns the battery temperature in degrees Celsius |
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* based on the NTC resistance. |
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*/ |
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static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di, |
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const struct ab8500_res_to_temp *tbl, int tbl_size, int res) |
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{ |
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int i; |
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/* |
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* Calculate the formula for the straight line |
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* Simple interpolation if we are within |
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* the resistance table limits, extrapolate |
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* if resistance is outside the limits. |
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*/ |
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if (res > tbl[0].resist) |
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i = 0; |
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else if (res <= tbl[tbl_size - 1].resist) |
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i = tbl_size - 2; |
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else { |
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i = 0; |
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while (!(res <= tbl[i].resist && |
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res > tbl[i + 1].resist)) |
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i++; |
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} |
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|
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return fixp_linear_interpolate(tbl[i].resist, tbl[i].temp, |
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tbl[i + 1].resist, tbl[i + 1].temp, |
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res); |
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} |
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|
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/** |
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* ab8500_btemp_measure_temp() - measure battery temperature |
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* @di: pointer to the ab8500_btemp structure |
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* |
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* Returns battery temperature (on success) else the previous temperature |
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*/ |
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static int ab8500_btemp_measure_temp(struct ab8500_btemp *di) |
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{ |
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int temp, ret; |
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static int prev; |
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int rbat, rntc, vntc; |
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u8 id; |
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|
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id = di->bm->batt_id; |
|
|
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if (di->bm->adc_therm == AB8500_ADC_THERM_BATCTRL && |
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id != BATTERY_UNKNOWN) { |
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|
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rbat = ab8500_btemp_get_batctrl_res(di); |
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if (rbat < 0) { |
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dev_err(di->dev, "%s get batctrl res failed\n", |
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__func__); |
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/* |
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* Return out-of-range temperature so that |
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* charging is stopped |
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*/ |
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return BTEMP_THERMAL_LOW_LIMIT; |
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} |
|
|
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temp = ab8500_btemp_res_to_temp(di, |
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di->bm->bat_type[id].r_to_t_tbl, |
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di->bm->bat_type[id].n_temp_tbl_elements, rbat); |
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} else { |
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ret = iio_read_channel_processed(di->btemp_ball, &vntc); |
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if (ret < 0) { |
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dev_err(di->dev, |
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"%s ADC conversion failed," |
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" using previous value\n", __func__); |
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return prev; |
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} |
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/* |
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* The PCB NTC is sourced from VTVOUT via a 230kOhm |
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* resistor. |
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*/ |
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rntc = 230000 * vntc / (VTVOUT_V - vntc); |
|
|
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temp = ab8500_btemp_res_to_temp(di, |
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di->bm->bat_type[id].r_to_t_tbl, |
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di->bm->bat_type[id].n_temp_tbl_elements, rntc); |
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prev = temp; |
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} |
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dev_dbg(di->dev, "Battery temperature is %d\n", temp); |
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return temp; |
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} |
|
|
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/** |
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* ab8500_btemp_id() - Identify the connected battery |
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* @di: pointer to the ab8500_btemp structure |
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* |
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* This function will try to identify the battery by reading the ID |
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* resistor. Some brands use a combined ID resistor with a NTC resistor to |
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* both be able to identify and to read the temperature of it. |
|
*/ |
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static int ab8500_btemp_id(struct ab8500_btemp *di) |
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{ |
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int res; |
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u8 i; |
|
|
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di->curr_source = BTEMP_BATCTRL_CURR_SRC_7UA; |
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di->bm->batt_id = BATTERY_UNKNOWN; |
|
|
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res = ab8500_btemp_get_batctrl_res(di); |
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if (res < 0) { |
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dev_err(di->dev, "%s get batctrl res failed\n", __func__); |
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return -ENXIO; |
|
} |
|
|
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/* BATTERY_UNKNOWN is defined on position 0, skip it! */ |
|
for (i = BATTERY_UNKNOWN + 1; i < di->bm->n_btypes; i++) { |
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if ((res <= di->bm->bat_type[i].resis_high) && |
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(res >= di->bm->bat_type[i].resis_low)) { |
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dev_dbg(di->dev, "Battery detected on %s" |
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" low %d < res %d < high: %d" |
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" index: %d\n", |
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di->bm->adc_therm == AB8500_ADC_THERM_BATCTRL ? |
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"BATCTRL" : "BATTEMP", |
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di->bm->bat_type[i].resis_low, res, |
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di->bm->bat_type[i].resis_high, i); |
|
|
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di->bm->batt_id = i; |
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break; |
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} |
|
} |
|
|
|
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 == AB8500_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; |
|
int bat_temp; |
|
struct ab8500_btemp *di = container_of(work, |
|
struct ab8500_btemp, btemp_periodic_work.work); |
|
|
|
if (!di->initialized) { |
|
/* Identify the battery */ |
|
if (ab8500_btemp_id(di) < 0) |
|
dev_warn(di->dev, "failed to identify the battery\n"); |
|
} |
|
|
|
bat_temp = ab8500_btemp_measure_temp(di); |
|
/* |
|
* Filter battery temperature. |
|
* Allow direct updates on temperature only if two samples result in |
|
* same temperature. Else only allow 1 degree change from previous |
|
* reported value in the direction of the new measurement. |
|
*/ |
|
if ((bat_temp == di->prev_bat_temp) || !di->initialized) { |
|
if ((di->bat_temp != di->prev_bat_temp) || !di->initialized) { |
|
di->initialized = true; |
|
di->bat_temp = bat_temp; |
|
power_supply_changed(di->btemp_psy); |
|
} |
|
} else if (bat_temp < di->prev_bat_temp) { |
|
di->bat_temp--; |
|
power_supply_changed(di->btemp_psy); |
|
} else if (bat_temp > di->prev_bat_temp) { |
|
di->bat_temp++; |
|
power_supply_changed(di->btemp_psy); |
|
} |
|
di->prev_bat_temp = bat_temp; |
|
|
|
if (di->events.ac_conn || di->events.usb_conn) |
|
interval = di->bm->temp_interval_chg; |
|
else |
|
interval = di->bm->temp_interval_nochg; |
|
|
|
/* Schedule a new measurement */ |
|
queue_delayed_work(di->btemp_wq, |
|
&di->btemp_periodic_work, |
|
round_jiffies(interval * HZ)); |
|
} |
|
|
|
/** |
|
* ab8500_btemp_batctrlindb_handler() - battery removal detected |
|
* @irq: interrupt number |
|
* @_di: void pointer that has to address of ab8500_btemp |
|
* |
|
* Returns IRQ status(IRQ_HANDLED) |
|
*/ |
|
static irqreturn_t ab8500_btemp_batctrlindb_handler(int irq, void *_di) |
|
{ |
|
struct ab8500_btemp *di = _di; |
|
dev_err(di->dev, "Battery removal detected!\n"); |
|
|
|
di->events.batt_rem = true; |
|
power_supply_changed(di->btemp_psy); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
/** |
|
* ab8500_btemp_templow_handler() - battery temp lower than 10 degrees |
|
* @irq: interrupt number |
|
* @_di: void pointer that has to address of ab8500_btemp |
|
* |
|
* Returns IRQ status(IRQ_HANDLED) |
|
*/ |
|
static irqreturn_t ab8500_btemp_templow_handler(int irq, void *_di) |
|
{ |
|
struct ab8500_btemp *di = _di; |
|
|
|
if (is_ab8500_3p3_or_earlier(di->parent)) { |
|
dev_dbg(di->dev, "Ignore false btemp low irq" |
|
" for ABB cut 1.0, 1.1, 2.0 and 3.3\n"); |
|
} else { |
|
dev_crit(di->dev, "Battery temperature lower than -10deg c\n"); |
|
|
|
di->events.btemp_low = true; |
|
di->events.btemp_high = false; |
|
di->events.btemp_medhigh = false; |
|
di->events.btemp_lowmed = false; |
|
power_supply_changed(di->btemp_psy); |
|
} |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
/** |
|
* ab8500_btemp_temphigh_handler() - battery temp higher than max temp |
|
* @irq: interrupt number |
|
* @_di: void pointer that has to address of ab8500_btemp |
|
* |
|
* Returns IRQ status(IRQ_HANDLED) |
|
*/ |
|
static irqreturn_t ab8500_btemp_temphigh_handler(int irq, void *_di) |
|
{ |
|
struct ab8500_btemp *di = _di; |
|
|
|
dev_crit(di->dev, "Battery temperature is higher than MAX temp\n"); |
|
|
|
di->events.btemp_high = true; |
|
di->events.btemp_medhigh = false; |
|
di->events.btemp_lowmed = false; |
|
di->events.btemp_low = false; |
|
power_supply_changed(di->btemp_psy); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
/** |
|
* ab8500_btemp_lowmed_handler() - battery temp between low and medium |
|
* @irq: interrupt number |
|
* @_di: void pointer that has to address of ab8500_btemp |
|
* |
|
* Returns IRQ status(IRQ_HANDLED) |
|
*/ |
|
static irqreturn_t ab8500_btemp_lowmed_handler(int irq, void *_di) |
|
{ |
|
struct ab8500_btemp *di = _di; |
|
|
|
dev_dbg(di->dev, "Battery temperature is between low and medium\n"); |
|
|
|
di->events.btemp_lowmed = true; |
|
di->events.btemp_medhigh = false; |
|
di->events.btemp_high = false; |
|
di->events.btemp_low = false; |
|
power_supply_changed(di->btemp_psy); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
/** |
|
* ab8500_btemp_medhigh_handler() - battery temp between medium and high |
|
* @irq: interrupt number |
|
* @_di: void pointer that has to address of ab8500_btemp |
|
* |
|
* Returns IRQ status(IRQ_HANDLED) |
|
*/ |
|
static irqreturn_t ab8500_btemp_medhigh_handler(int irq, void *_di) |
|
{ |
|
struct ab8500_btemp *di = _di; |
|
|
|
dev_dbg(di->dev, "Battery temperature is between medium and high\n"); |
|
|
|
di->events.btemp_medhigh = true; |
|
di->events.btemp_lowmed = false; |
|
di->events.btemp_high = false; |
|
di->events.btemp_low = false; |
|
power_supply_changed(di->btemp_psy); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
/** |
|
* ab8500_btemp_periodic() - Periodic temperature measurements |
|
* @di: pointer to the ab8500_btemp structure |
|
* @enable: enable or disable periodic temperature measurements |
|
* |
|
* Starts of stops periodic temperature measurements. Periodic measurements |
|
* should only be done when a charger is connected. |
|
*/ |
|
static void ab8500_btemp_periodic(struct ab8500_btemp *di, |
|
bool enable) |
|
{ |
|
dev_dbg(di->dev, "Enable periodic temperature measurements: %d\n", |
|
enable); |
|
/* |
|
* Make sure a new measurement is done directly by cancelling |
|
* any pending work |
|
*/ |
|
cancel_delayed_work_sync(&di->btemp_periodic_work); |
|
|
|
if (enable) |
|
queue_delayed_work(di->btemp_wq, &di->btemp_periodic_work, 0); |
|
} |
|
|
|
/** |
|
* ab8500_btemp_get_temp() - get battery temperature |
|
* @di: pointer to the ab8500_btemp structure |
|
* |
|
* Returns battery temperature |
|
*/ |
|
static 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; |
|
} |
|
|
|
/** |
|
* 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; |
|
} |
|
|
|
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; |
|
} |
|
|
|
/** |
|
* 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); |
|
} |
|
|
|
/* 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}, |
|
}; |
|
|
|
static int __maybe_unused ab8500_btemp_resume(struct device *dev) |
|
{ |
|
struct ab8500_btemp *di = dev_get_drvdata(dev); |
|
|
|
ab8500_btemp_periodic(di, true); |
|
|
|
return 0; |
|
} |
|
|
|
static int __maybe_unused ab8500_btemp_suspend(struct device *dev) |
|
{ |
|
struct ab8500_btemp *di = dev_get_drvdata(dev); |
|
|
|
ab8500_btemp_periodic(di, false); |
|
|
|
return 0; |
|
} |
|
|
|
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_bind(struct device *dev, struct device *master, |
|
void *data) |
|
{ |
|
struct ab8500_btemp *di = dev_get_drvdata(dev); |
|
|
|
/* 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(dev, "failed to create work queue\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
/* Kick off periodic temperature measurements */ |
|
ab8500_btemp_periodic(di, true); |
|
|
|
return 0; |
|
} |
|
|
|
static void ab8500_btemp_unbind(struct device *dev, struct device *master, |
|
void *data) |
|
{ |
|
struct ab8500_btemp *di = dev_get_drvdata(dev); |
|
|
|
/* Delete the work queue */ |
|
destroy_workqueue(di->btemp_wq); |
|
flush_scheduled_work(); |
|
} |
|
|
|
static const struct component_ops ab8500_btemp_component_ops = { |
|
.bind = ab8500_btemp_bind, |
|
.unbind = ab8500_btemp_unbind, |
|
}; |
|
|
|
static int ab8500_btemp_probe(struct platform_device *pdev) |
|
{ |
|
struct power_supply_config psy_cfg = {}; |
|
struct device *dev = &pdev->dev; |
|
struct ab8500_btemp *di; |
|
int irq, i, ret = 0; |
|
u8 val; |
|
|
|
di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL); |
|
if (!di) |
|
return -ENOMEM; |
|
|
|
di->bm = &ab8500_bm_data; |
|
|
|
/* get parent data */ |
|
di->dev = dev; |
|
di->parent = dev_get_drvdata(pdev->dev.parent); |
|
|
|
/* Get ADC channels */ |
|
di->btemp_ball = devm_iio_channel_get(dev, "btemp_ball"); |
|
if (IS_ERR(di->btemp_ball)) { |
|
ret = dev_err_probe(dev, PTR_ERR(di->btemp_ball), |
|
"failed to get BTEMP BALL ADC channel\n"); |
|
return ret; |
|
} |
|
di->bat_ctrl = devm_iio_channel_get(dev, "bat_ctrl"); |
|
if (IS_ERR(di->bat_ctrl)) { |
|
ret = dev_err_probe(dev, PTR_ERR(di->bat_ctrl), |
|
"failed to get BAT CTRL ADC channel\n"); |
|
return ret; |
|
} |
|
|
|
di->initialized = false; |
|
|
|
psy_cfg.supplied_to = supply_interface; |
|
psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface); |
|
psy_cfg.drv_data = di; |
|
|
|
/* 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(dev, AB8500_CHARGER, |
|
AB8500_BTEMP_HIGH_TH, &val); |
|
if (ret < 0) { |
|
dev_err(dev, "%s ab8500 read failed\n", __func__); |
|
return ret; |
|
} |
|
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 = devm_power_supply_register(dev, &ab8500_btemp_desc, |
|
&psy_cfg); |
|
if (IS_ERR(di->btemp_psy)) { |
|
dev_err(dev, "failed to register BTEMP psy\n"); |
|
return PTR_ERR(di->btemp_psy); |
|
} |
|
|
|
/* Register interrupts */ |
|
for (i = 0; i < ARRAY_SIZE(ab8500_btemp_irq); i++) { |
|
irq = platform_get_irq_byname(pdev, ab8500_btemp_irq[i].name); |
|
if (irq < 0) |
|
return irq; |
|
|
|
ret = devm_request_threaded_irq(dev, irq, NULL, |
|
ab8500_btemp_irq[i].isr, |
|
IRQF_SHARED | IRQF_NO_SUSPEND | IRQF_ONESHOT, |
|
ab8500_btemp_irq[i].name, di); |
|
|
|
if (ret) { |
|
dev_err(dev, "failed to request %s IRQ %d: %d\n" |
|
, ab8500_btemp_irq[i].name, irq, ret); |
|
return ret; |
|
} |
|
dev_dbg(dev, "Requested %s IRQ %d: %d\n", |
|
ab8500_btemp_irq[i].name, irq, ret); |
|
} |
|
|
|
platform_set_drvdata(pdev, di); |
|
|
|
list_add_tail(&di->node, &ab8500_btemp_list); |
|
|
|
return component_add(dev, &ab8500_btemp_component_ops); |
|
} |
|
|
|
static int ab8500_btemp_remove(struct platform_device *pdev) |
|
{ |
|
component_del(&pdev->dev, &ab8500_btemp_component_ops); |
|
|
|
return 0; |
|
} |
|
|
|
static SIMPLE_DEV_PM_OPS(ab8500_btemp_pm_ops, ab8500_btemp_suspend, ab8500_btemp_resume); |
|
|
|
static const struct of_device_id ab8500_btemp_match[] = { |
|
{ .compatible = "stericsson,ab8500-btemp", }, |
|
{ }, |
|
}; |
|
MODULE_DEVICE_TABLE(of, ab8500_btemp_match); |
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|
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struct platform_driver ab8500_btemp_driver = { |
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.probe = ab8500_btemp_probe, |
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.remove = ab8500_btemp_remove, |
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.driver = { |
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.name = "ab8500-btemp", |
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.of_match_table = ab8500_btemp_match, |
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.pm = &ab8500_btemp_pm_ops, |
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}, |
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}; |
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MODULE_LICENSE("GPL v2"); |
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MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy"); |
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MODULE_ALIAS("platform:ab8500-btemp"); |
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MODULE_DESCRIPTION("AB8500 battery temperature driver");
|
|
|