// SPDX-License-Identifier: GPL-2.0-only /* * axp288_adc.c - X-Powers AXP288 PMIC ADC Driver * * Copyright (C) 2014 Intel Corporation * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include <linux/dmi.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/kernel.h> #include <linux/device.h> #include <linux/regmap.h> #include <linux/mfd/axp20x.h> #include <linux/platform_device.h> #include <linux/iio/iio.h> #include <linux/iio/machine.h> #include <linux/iio/driver.h> /* * This mask enables all ADCs except for the battery temp-sensor (TS), that is * left as-is to avoid breaking charging on devices without a temp-sensor. */ #define AXP288_ADC_EN_MASK … #define AXP288_ADC_TS_ENABLE … #define AXP288_ADC_TS_BIAS_MASK … #define AXP288_ADC_TS_BIAS_20UA … #define AXP288_ADC_TS_BIAS_40UA … #define AXP288_ADC_TS_BIAS_60UA … #define AXP288_ADC_TS_BIAS_80UA … #define AXP288_ADC_TS_CURRENT_ON_OFF_MASK … #define AXP288_ADC_TS_CURRENT_OFF … #define AXP288_ADC_TS_CURRENT_ON_WHEN_CHARGING … #define AXP288_ADC_TS_CURRENT_ON_ONDEMAND … #define AXP288_ADC_TS_CURRENT_ON … enum axp288_adc_id { … }; struct axp288_adc_info { … }; static const struct iio_chan_spec axp288_adc_channels[] = …; /* for consumer drivers */ static struct iio_map axp288_adc_default_maps[] = …; static int axp288_adc_read_channel(int *val, unsigned long address, struct regmap *regmap) { … } /* * The current-source used for the battery temp-sensor (TS) is shared * with the GPADC. For proper fuel-gauge and charger operation the TS * current-source needs to be permanently on. But to read the GPADC we * need to temporary switch the TS current-source to ondemand, so that * the GPADC can use it, otherwise we will always read an all 0 value. */ static int axp288_adc_set_ts(struct axp288_adc_info *info, unsigned int mode, unsigned long address) { … } static int axp288_adc_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } /* * We rely on the machine's firmware to correctly setup the TS pin bias current * at boot. This lists systems with broken fw where we need to set it ourselves. */ static const struct dmi_system_id axp288_adc_ts_bias_override[] = …; static int axp288_adc_initialize(struct axp288_adc_info *info) { … } static const struct iio_info axp288_adc_iio_info = …; static int axp288_adc_probe(struct platform_device *pdev) { … } static const struct platform_device_id axp288_adc_id_table[] = …; static struct platform_driver axp288_adc_driver = …; MODULE_DEVICE_TABLE(platform, axp288_adc_id_table); module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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