123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326 |
- // 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 <jacob.jun.pan@linux.intel.com>");
- MODULE_DESCRIPTION("X-Powers AXP288 ADC Driver");
- MODULE_LICENSE("GPL");
|