94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
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/* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __PMIC8XXX_CCADC_H__
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#define __PMIC8XXX_CCADC_H__
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#include <linux/mfd/pm8xxx/core.h>
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#define PM8XXX_CCADC_DEV_NAME "pm8xxx-ccadc"
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struct pm8xxx_ccadc_core_data {
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unsigned int batt_temp_channel;
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};
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/**
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* struct pm8xxx_ccadc_platform_data -
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* @ccadc_cdata: core data for the ccadc driver containing channel info
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* @r_sense_uohm: sense resistor value in (micro Ohms)
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* @calib_delay_ms: how often should the adc calculate gain and offset
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* @periodic_wakeup: a flag to indicate that this system wakeups periodically
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* for calibration/other housekeeping activities. The ccadc
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* does a quick calibration while resuming
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*/
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struct pm8xxx_ccadc_platform_data {
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struct pm8xxx_ccadc_core_data ccadc_cdata;
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int r_sense_uohm;
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unsigned int calib_delay_ms;
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bool periodic_wakeup;
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};
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#define CCADC_READING_RESOLUTION_N 542535
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#define CCADC_READING_RESOLUTION_D 100000
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static inline s64 pm8xxx_ccadc_reading_to_microvolt(int revision, s64 cc)
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{
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return div_s64(cc * CCADC_READING_RESOLUTION_N,
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CCADC_READING_RESOLUTION_D);
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}
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#if defined(CONFIG_PM8XXX_CCADC) || defined(CONFIG_PM8XXX_CCADC_MODULE)
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/**
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* pm8xxx_cc_adjust_for_gain - the function to adjust the voltage read from
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* ccadc for gain compensation
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* @v: the voltage which needs to be gain compensated in microVolts
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*
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*
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* RETURNS: gain compensated voltage
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*/
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s64 pm8xxx_cc_adjust_for_gain(s64 uv);
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/**
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* pm8xxx_calib_ccadc - calibration for ccadc. This will calculate gain
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* and offset and reprogram them in the appropriate
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* registers
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*/
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void pm8xxx_calib_ccadc(void);
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/**
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* pm8xxx_ccadc_get_battery_current - return the battery current based on vsense
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* resitor in microamperes
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* @result: The pointer where the voltage will be updated. A -ve
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* result means that the current is flowing in
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* the battery - during battery charging
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*
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* RETURNS: Error code if there was a problem reading vsense, Zero otherwise
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* The result won't be updated in case of an error.
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*
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*/
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int pm8xxx_ccadc_get_battery_current(int *bat_current);
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#else
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static inline s64 pm8xxx_cc_adjust_for_gain(s64 uv)
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{
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return -ENXIO;
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}
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static inline void pm8xxx_calib_ccadc(void)
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{
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}
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static inline int pm8xxx_ccadc_get_battery_current(int *bat_current)
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{
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return -ENXIO;
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}
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#endif
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#endif /* __PMIC8XXX_CCADC_H__ */
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