mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
326 lines
8.5 KiB
326 lines
8.5 KiB
// 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/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 0xF0 |
|
#define AXP288_ADC_TS_ENABLE 0x01 |
|
|
|
#define AXP288_ADC_TS_BIAS_MASK GENMASK(5, 4) |
|
#define AXP288_ADC_TS_BIAS_20UA (0 << 4) |
|
#define AXP288_ADC_TS_BIAS_40UA (1 << 4) |
|
#define AXP288_ADC_TS_BIAS_60UA (2 << 4) |
|
#define AXP288_ADC_TS_BIAS_80UA (3 << 4) |
|
#define AXP288_ADC_TS_CURRENT_ON_OFF_MASK GENMASK(1, 0) |
|
#define AXP288_ADC_TS_CURRENT_OFF (0 << 0) |
|
#define AXP288_ADC_TS_CURRENT_ON_WHEN_CHARGING (1 << 0) |
|
#define AXP288_ADC_TS_CURRENT_ON_ONDEMAND (2 << 0) |
|
#define AXP288_ADC_TS_CURRENT_ON (3 << 0) |
|
|
|
enum axp288_adc_id { |
|
AXP288_ADC_TS, |
|
AXP288_ADC_PMIC, |
|
AXP288_ADC_GP, |
|
AXP288_ADC_BATT_CHRG_I, |
|
AXP288_ADC_BATT_DISCHRG_I, |
|
AXP288_ADC_BATT_V, |
|
AXP288_ADC_NR_CHAN, |
|
}; |
|
|
|
struct axp288_adc_info { |
|
int irq; |
|
struct regmap *regmap; |
|
bool ts_enabled; |
|
}; |
|
|
|
static const struct iio_chan_spec axp288_adc_channels[] = { |
|
{ |
|
.indexed = 1, |
|
.type = IIO_TEMP, |
|
.channel = 0, |
|
.address = AXP288_TS_ADC_H, |
|
.datasheet_name = "TS_PIN", |
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
|
}, { |
|
.indexed = 1, |
|
.type = IIO_TEMP, |
|
.channel = 1, |
|
.address = AXP288_PMIC_ADC_H, |
|
.datasheet_name = "PMIC_TEMP", |
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
|
}, { |
|
.indexed = 1, |
|
.type = IIO_TEMP, |
|
.channel = 2, |
|
.address = AXP288_GP_ADC_H, |
|
.datasheet_name = "GPADC", |
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
|
}, { |
|
.indexed = 1, |
|
.type = IIO_CURRENT, |
|
.channel = 3, |
|
.address = AXP20X_BATT_CHRG_I_H, |
|
.datasheet_name = "BATT_CHG_I", |
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
|
}, { |
|
.indexed = 1, |
|
.type = IIO_CURRENT, |
|
.channel = 4, |
|
.address = AXP20X_BATT_DISCHRG_I_H, |
|
.datasheet_name = "BATT_DISCHRG_I", |
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
|
}, { |
|
.indexed = 1, |
|
.type = IIO_VOLTAGE, |
|
.channel = 5, |
|
.address = AXP20X_BATT_V_H, |
|
.datasheet_name = "BATT_V", |
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
|
}, |
|
}; |
|
|
|
/* for consumer drivers */ |
|
static struct iio_map axp288_adc_default_maps[] = { |
|
IIO_MAP("TS_PIN", "axp288-batt", "axp288-batt-temp"), |
|
IIO_MAP("PMIC_TEMP", "axp288-pmic", "axp288-pmic-temp"), |
|
IIO_MAP("GPADC", "axp288-gpadc", "axp288-system-temp"), |
|
IIO_MAP("BATT_CHG_I", "axp288-chrg", "axp288-chrg-curr"), |
|
IIO_MAP("BATT_DISCHRG_I", "axp288-chrg", "axp288-chrg-d-curr"), |
|
IIO_MAP("BATT_V", "axp288-batt", "axp288-batt-volt"), |
|
{}, |
|
}; |
|
|
|
static int axp288_adc_read_channel(int *val, unsigned long address, |
|
struct regmap *regmap) |
|
{ |
|
u8 buf[2]; |
|
|
|
if (regmap_bulk_read(regmap, address, buf, 2)) |
|
return -EIO; |
|
*val = (buf[0] << 4) + ((buf[1] >> 4) & 0x0F); |
|
|
|
return IIO_VAL_INT; |
|
} |
|
|
|
/* |
|
* 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) |
|
{ |
|
int ret; |
|
|
|
/* No need to switch the current-source if the TS pin is disabled */ |
|
if (!info->ts_enabled) |
|
return 0; |
|
|
|
/* Channels other than GPADC do not need the current source */ |
|
if (address != AXP288_GP_ADC_H) |
|
return 0; |
|
|
|
ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL, |
|
AXP288_ADC_TS_CURRENT_ON_OFF_MASK, mode); |
|
if (ret) |
|
return ret; |
|
|
|
/* When switching to the GPADC pin give things some time to settle */ |
|
if (mode == AXP288_ADC_TS_CURRENT_ON_ONDEMAND) |
|
usleep_range(6000, 10000); |
|
|
|
return 0; |
|
} |
|
|
|
static int axp288_adc_read_raw(struct iio_dev *indio_dev, |
|
struct iio_chan_spec const *chan, |
|
int *val, int *val2, long mask) |
|
{ |
|
int ret; |
|
struct axp288_adc_info *info = iio_priv(indio_dev); |
|
|
|
mutex_lock(&indio_dev->mlock); |
|
switch (mask) { |
|
case IIO_CHAN_INFO_RAW: |
|
if (axp288_adc_set_ts(info, AXP288_ADC_TS_CURRENT_ON_ONDEMAND, |
|
chan->address)) { |
|
dev_err(&indio_dev->dev, "GPADC mode\n"); |
|
ret = -EINVAL; |
|
break; |
|
} |
|
ret = axp288_adc_read_channel(val, chan->address, info->regmap); |
|
if (axp288_adc_set_ts(info, AXP288_ADC_TS_CURRENT_ON, |
|
chan->address)) |
|
dev_err(&indio_dev->dev, "TS pin restore\n"); |
|
break; |
|
default: |
|
ret = -EINVAL; |
|
} |
|
mutex_unlock(&indio_dev->mlock); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* 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[] = { |
|
{ |
|
/* Lenovo Ideapad 100S (11 inch) */ |
|
.matches = { |
|
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), |
|
DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo ideapad 100S-11IBY"), |
|
}, |
|
.driver_data = (void *)(uintptr_t)AXP288_ADC_TS_BIAS_80UA, |
|
}, |
|
{} |
|
}; |
|
|
|
static int axp288_adc_initialize(struct axp288_adc_info *info) |
|
{ |
|
const struct dmi_system_id *bias_override; |
|
int ret, adc_enable_val; |
|
|
|
bias_override = dmi_first_match(axp288_adc_ts_bias_override); |
|
if (bias_override) { |
|
ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL, |
|
AXP288_ADC_TS_BIAS_MASK, |
|
(uintptr_t)bias_override->driver_data); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
/* |
|
* Determine if the TS pin is enabled and set the TS current-source |
|
* accordingly. |
|
*/ |
|
ret = regmap_read(info->regmap, AXP20X_ADC_EN1, &adc_enable_val); |
|
if (ret) |
|
return ret; |
|
|
|
if (adc_enable_val & AXP288_ADC_TS_ENABLE) { |
|
info->ts_enabled = true; |
|
ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL, |
|
AXP288_ADC_TS_CURRENT_ON_OFF_MASK, |
|
AXP288_ADC_TS_CURRENT_ON); |
|
} else { |
|
info->ts_enabled = false; |
|
ret = regmap_update_bits(info->regmap, AXP288_ADC_TS_PIN_CTRL, |
|
AXP288_ADC_TS_CURRENT_ON_OFF_MASK, |
|
AXP288_ADC_TS_CURRENT_OFF); |
|
} |
|
if (ret) |
|
return ret; |
|
|
|
/* Turn on the ADC for all channels except TS, leave TS as is */ |
|
return regmap_update_bits(info->regmap, AXP20X_ADC_EN1, |
|
AXP288_ADC_EN_MASK, AXP288_ADC_EN_MASK); |
|
} |
|
|
|
static const struct iio_info axp288_adc_iio_info = { |
|
.read_raw = &axp288_adc_read_raw, |
|
}; |
|
|
|
static int axp288_adc_probe(struct platform_device *pdev) |
|
{ |
|
int ret; |
|
struct axp288_adc_info *info; |
|
struct iio_dev *indio_dev; |
|
struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); |
|
|
|
indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info)); |
|
if (!indio_dev) |
|
return -ENOMEM; |
|
|
|
info = iio_priv(indio_dev); |
|
info->irq = platform_get_irq(pdev, 0); |
|
if (info->irq < 0) |
|
return info->irq; |
|
platform_set_drvdata(pdev, indio_dev); |
|
info->regmap = axp20x->regmap; |
|
/* |
|
* Set ADC to enabled state at all time, including system suspend. |
|
* otherwise internal fuel gauge functionality may be affected. |
|
*/ |
|
ret = axp288_adc_initialize(info); |
|
if (ret) { |
|
dev_err(&pdev->dev, "unable to enable ADC device\n"); |
|
return ret; |
|
} |
|
|
|
indio_dev->name = pdev->name; |
|
indio_dev->channels = axp288_adc_channels; |
|
indio_dev->num_channels = ARRAY_SIZE(axp288_adc_channels); |
|
indio_dev->info = &axp288_adc_iio_info; |
|
indio_dev->modes = INDIO_DIRECT_MODE; |
|
ret = iio_map_array_register(indio_dev, axp288_adc_default_maps); |
|
if (ret < 0) |
|
return ret; |
|
|
|
ret = iio_device_register(indio_dev); |
|
if (ret < 0) { |
|
dev_err(&pdev->dev, "unable to register iio device\n"); |
|
goto err_array_unregister; |
|
} |
|
return 0; |
|
|
|
err_array_unregister: |
|
iio_map_array_unregister(indio_dev); |
|
|
|
return ret; |
|
} |
|
|
|
static int axp288_adc_remove(struct platform_device *pdev) |
|
{ |
|
struct iio_dev *indio_dev = platform_get_drvdata(pdev); |
|
|
|
iio_device_unregister(indio_dev); |
|
iio_map_array_unregister(indio_dev); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct platform_device_id axp288_adc_id_table[] = { |
|
{ .name = "axp288_adc" }, |
|
{}, |
|
}; |
|
|
|
static struct platform_driver axp288_adc_driver = { |
|
.probe = axp288_adc_probe, |
|
.remove = axp288_adc_remove, |
|
.id_table = axp288_adc_id_table, |
|
.driver = { |
|
.name = "axp288_adc", |
|
}, |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(platform, axp288_adc_id_table); |
|
|
|
module_platform_driver(axp288_adc_driver); |
|
|
|
MODULE_AUTHOR("Jacob Pan <[email protected]>"); |
|
MODULE_DESCRIPTION("X-Powers AXP288 ADC Driver"); |
|
MODULE_LICENSE("GPL");
|
|
|