320 lines
8.4 KiB
C
320 lines
8.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* axp288_adc.c - X-Powers AXP288 PMIC ADC Driver
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*
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* Copyright (C) 2014 Intel Corporation
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/dmi.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/regmap.h>
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#include <linux/mfd/axp20x.h>
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#include <linux/platform_device.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/machine.h>
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#include <linux/iio/driver.h>
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/*
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* This mask enables all ADCs except for the battery temp-sensor (TS), that is
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* left as-is to avoid breaking charging on devices without a temp-sensor.
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*/
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#define AXP288_ADC_EN_MASK 0xF0
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#define AXP288_ADC_TS_ENABLE 0x01
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#define AXP288_ADC_TS_BIAS_MASK GENMASK(5, 4)
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#define AXP288_ADC_TS_BIAS_20UA (0 << 4)
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#define AXP288_ADC_TS_BIAS_40UA (1 << 4)
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#define AXP288_ADC_TS_BIAS_60UA (2 << 4)
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#define AXP288_ADC_TS_BIAS_80UA (3 << 4)
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#define AXP288_ADC_TS_CURRENT_ON_OFF_MASK GENMASK(1, 0)
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#define AXP288_ADC_TS_CURRENT_OFF (0 << 0)
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#define AXP288_ADC_TS_CURRENT_ON_WHEN_CHARGING (1 << 0)
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#define AXP288_ADC_TS_CURRENT_ON_ONDEMAND (2 << 0)
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#define AXP288_ADC_TS_CURRENT_ON (3 << 0)
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enum axp288_adc_id {
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AXP288_ADC_TS,
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AXP288_ADC_PMIC,
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AXP288_ADC_GP,
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AXP288_ADC_BATT_CHRG_I,
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AXP288_ADC_BATT_DISCHRG_I,
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AXP288_ADC_BATT_V,
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AXP288_ADC_NR_CHAN,
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};
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struct axp288_adc_info {
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int irq;
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struct regmap *regmap;
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/* lock to protect against multiple access to the device */
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struct mutex lock;
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bool ts_enabled;
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};
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static const struct iio_chan_spec axp288_adc_channels[] = {
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{
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.indexed = 1,
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.type = IIO_TEMP,
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.channel = 0,
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.address = AXP288_TS_ADC_H,
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.datasheet_name = "TS_PIN",
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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}, {
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.indexed = 1,
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.type = IIO_TEMP,
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.channel = 1,
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.address = AXP288_PMIC_ADC_H,
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.datasheet_name = "PMIC_TEMP",
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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}, {
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.indexed = 1,
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.type = IIO_TEMP,
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.channel = 2,
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.address = AXP288_GP_ADC_H,
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.datasheet_name = "GPADC",
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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}, {
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.indexed = 1,
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.type = IIO_CURRENT,
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.channel = 3,
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.address = AXP20X_BATT_CHRG_I_H,
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.datasheet_name = "BATT_CHG_I",
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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}, {
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.indexed = 1,
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.type = IIO_CURRENT,
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.channel = 4,
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.address = AXP20X_BATT_DISCHRG_I_H,
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.datasheet_name = "BATT_DISCHRG_I",
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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}, {
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.indexed = 1,
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.type = IIO_VOLTAGE,
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.channel = 5,
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.address = AXP20X_BATT_V_H,
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.datasheet_name = "BATT_V",
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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},
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};
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/* for consumer drivers */
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static struct iio_map axp288_adc_default_maps[] = {
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IIO_MAP("TS_PIN", "axp288-batt", "axp288-batt-temp"),
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IIO_MAP("PMIC_TEMP", "axp288-pmic", "axp288-pmic-temp"),
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IIO_MAP("GPADC", "axp288-gpadc", "axp288-system-temp"),
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IIO_MAP("BATT_CHG_I", "axp288-chrg", "axp288-chrg-curr"),
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IIO_MAP("BATT_DISCHRG_I", "axp288-chrg", "axp288-chrg-d-curr"),
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IIO_MAP("BATT_V", "axp288-batt", "axp288-batt-volt"),
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{},
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};
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static int axp288_adc_read_channel(int *val, unsigned long address,
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struct regmap *regmap)
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{
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u8 buf[2];
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if (regmap_bulk_read(regmap, address, buf, 2))
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return -EIO;
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*val = (buf[0] << 4) + ((buf[1] >> 4) & 0x0F);
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return IIO_VAL_INT;
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}
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/*
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* The current-source used for the battery temp-sensor (TS) is shared
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* with the GPADC. For proper fuel-gauge and charger operation the TS
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* current-source needs to be permanently on. But to read the GPADC we
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* need to temporary switch the TS current-source to ondemand, so that
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* the GPADC can use it, otherwise we will always read an all 0 value.
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*/
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static int axp288_adc_set_ts(struct axp288_adc_info *info,
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unsigned int mode, unsigned long address)
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{
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int ret;
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/* No need to switch the current-source if the TS pin is disabled */
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if (!info->ts_enabled)
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return 0;
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/* Channels other than GPADC do not need the current source */
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if (address != AXP288_GP_ADC_H)
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return 0;
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ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL,
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AXP288_ADC_TS_CURRENT_ON_OFF_MASK, mode);
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if (ret)
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return ret;
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/* When switching to the GPADC pin give things some time to settle */
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if (mode == AXP288_ADC_TS_CURRENT_ON_ONDEMAND)
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usleep_range(6000, 10000);
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return 0;
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}
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static int axp288_adc_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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int ret;
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struct axp288_adc_info *info = iio_priv(indio_dev);
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mutex_lock(&info->lock);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (axp288_adc_set_ts(info, AXP288_ADC_TS_CURRENT_ON_ONDEMAND,
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chan->address)) {
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dev_err(&indio_dev->dev, "GPADC mode\n");
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ret = -EINVAL;
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break;
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}
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ret = axp288_adc_read_channel(val, chan->address, info->regmap);
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if (axp288_adc_set_ts(info, AXP288_ADC_TS_CURRENT_ON,
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chan->address))
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dev_err(&indio_dev->dev, "TS pin restore\n");
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break;
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default:
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ret = -EINVAL;
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}
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mutex_unlock(&info->lock);
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return ret;
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}
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/*
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* We rely on the machine's firmware to correctly setup the TS pin bias current
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* at boot. This lists systems with broken fw where we need to set it ourselves.
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*/
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static const struct dmi_system_id axp288_adc_ts_bias_override[] = {
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{
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/* Lenovo Ideapad 100S (11 inch) */
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
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DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo ideapad 100S-11IBY"),
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},
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.driver_data = (void *)(uintptr_t)AXP288_ADC_TS_BIAS_80UA,
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},
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{
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/* Nuvision Solo 10 Draw */
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "TMAX"),
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DMI_MATCH(DMI_PRODUCT_NAME, "TM101W610L"),
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},
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.driver_data = (void *)(uintptr_t)AXP288_ADC_TS_BIAS_80UA,
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},
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{}
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};
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static int axp288_adc_initialize(struct axp288_adc_info *info)
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{
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const struct dmi_system_id *bias_override;
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int ret, adc_enable_val;
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bias_override = dmi_first_match(axp288_adc_ts_bias_override);
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if (bias_override) {
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ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL,
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AXP288_ADC_TS_BIAS_MASK,
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(uintptr_t)bias_override->driver_data);
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if (ret)
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return ret;
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}
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/*
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* Determine if the TS pin is enabled and set the TS current-source
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* accordingly.
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*/
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ret = regmap_read(info->regmap, AXP20X_ADC_EN1, &adc_enable_val);
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if (ret)
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return ret;
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if (adc_enable_val & AXP288_ADC_TS_ENABLE) {
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info->ts_enabled = true;
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ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL,
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AXP288_ADC_TS_CURRENT_ON_OFF_MASK,
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AXP288_ADC_TS_CURRENT_ON);
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} else {
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info->ts_enabled = false;
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ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL,
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AXP288_ADC_TS_CURRENT_ON_OFF_MASK,
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AXP288_ADC_TS_CURRENT_OFF);
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}
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if (ret)
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return ret;
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/* Turn on the ADC for all channels except TS, leave TS as is */
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return regmap_update_bits(info->regmap, AXP20X_ADC_EN1,
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AXP288_ADC_EN_MASK, AXP288_ADC_EN_MASK);
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}
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static const struct iio_info axp288_adc_iio_info = {
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.read_raw = &axp288_adc_read_raw,
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};
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static int axp288_adc_probe(struct platform_device *pdev)
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{
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int ret;
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struct axp288_adc_info *info;
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struct iio_dev *indio_dev;
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struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
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indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));
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if (!indio_dev)
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return -ENOMEM;
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info = iio_priv(indio_dev);
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info->irq = platform_get_irq(pdev, 0);
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if (info->irq < 0)
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return info->irq;
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info->regmap = axp20x->regmap;
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/*
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* Set ADC to enabled state at all time, including system suspend.
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* otherwise internal fuel gauge functionality may be affected.
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*/
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ret = axp288_adc_initialize(info);
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if (ret) {
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dev_err(&pdev->dev, "unable to enable ADC device\n");
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return ret;
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}
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indio_dev->name = pdev->name;
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indio_dev->channels = axp288_adc_channels;
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indio_dev->num_channels = ARRAY_SIZE(axp288_adc_channels);
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indio_dev->info = &axp288_adc_iio_info;
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = devm_iio_map_array_register(&pdev->dev, indio_dev, axp288_adc_default_maps);
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if (ret < 0)
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return ret;
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mutex_init(&info->lock);
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return devm_iio_device_register(&pdev->dev, indio_dev);
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}
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static const struct platform_device_id axp288_adc_id_table[] = {
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{ .name = "axp288_adc" },
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{},
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};
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static struct platform_driver axp288_adc_driver = {
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.probe = axp288_adc_probe,
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.id_table = axp288_adc_id_table,
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.driver = {
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.name = "axp288_adc",
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},
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};
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MODULE_DEVICE_TABLE(platform, axp288_adc_id_table);
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module_platform_driver(axp288_adc_driver);
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MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@linux.intel.com>");
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MODULE_DESCRIPTION("X-Powers AXP288 ADC Driver");
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MODULE_LICENSE("GPL");
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