> Platform driver for XPowers AXP288 ADC, which is a sub-device of the
> customized PMIC for Intel Baytrail-CR platforms. GPADC device enumerates
> as one of the MFD cell devices. It uses IIO infrastructure to communicate
> with userspace and consumer drivers.
>
> Usages of ADC channels include battery charging and thermal sensors.
minor nitpicking below
> Based on initial work by:
> Ramakrishna Pallala <ramakrishna.pallala@xxxxxxxxx>
>
> Signed-off-by: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
> ---
> drivers/iio/adc/Kconfig | 8 ++
> drivers/iio/adc/Makefile | 1 +
> drivers/iio/adc/axp288_gpadc.c | 238 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 247 insertions(+)
> create mode 100644 drivers/iio/adc/axp288_gpadc.c
>
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 11b048a..d02a08e 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -127,6 +127,14 @@ config AT91_ADC
> help
> Say yes here to build support for Atmel AT91 ADC.
>
> +config AXP288_GPADC
> + tristate "X-Power AXP288 GPADC driver"
> + depends on MFD_AXP2XX
> + help
> + Say yes here to have support for X-Power power management IC (PMIC) ADC
> + device. Depending on platform configuration, this general purpose ADC can
> + be used for sampling sensors such as thermal resistors.
> +
> config EXYNOS_ADC
> tristate "Exynos ADC driver support"
> depends on ARCH_EXYNOS || (OF && COMPILE_TEST)
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index ad81b51..8bf0104 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -30,3 +30,4 @@ obj-$(CONFIG_VF610_ADC) += vf610_adc.o
> obj-$(CONFIG_VIPERBOARD_ADC) += viperboard_adc.o
> xilinx-xadc-y := xilinx-xadc-core.o xilinx-xadc-events.o
> obj-$(CONFIG_XILINX_XADC) += xilinx-xadc.o
> +obj-$(CONFIG_AXP288_GPADC) += axp288_gpadc.o
> diff --git a/drivers/iio/adc/axp288_gpadc.c b/drivers/iio/adc/axp288_gpadc.c
> new file mode 100644
> index 0000000..aaa24b0
> --- /dev/null
> +++ b/drivers/iio/adc/axp288_gpadc.c
> @@ -0,0 +1,238 @@
> +/*
> + * axp288_gpadc.c - Xpower AXP288 PMIC GPADC Driver
X-Power
> + *
> + * Copyright (C) 2014 Intel Corporation
> + *
> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; version 2 of the License.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + * General Public License for more details.
> + *
> + */
> +
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/device.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/axp2xx.h>
> +#include <linux/platform_device.h>
> +
> +#include <linux/iio/iio.h>
> +#include <linux/iio/machine.h>
> +#include <linux/iio/driver.h>
> +
> +#define AXP288_ADC_EN_MASK 0xF1
> +#define AXP288_ADC_TS_PIN_GPADC 0xF2
> +#define AXP288_ADC_TS_PIN_ON 0xF3
> +
> +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,
> +};
> +
> +static const int axp288_scale[AXP288_ADC_NR_CHAN] = {
axp288_adc_scale
> + [AXP288_ADC_BATT_CHRG_I] = 1,
> + [AXP288_ADC_BATT_DISCHRG_I] = 1,
> + [AXP288_ADC_BATT_V] = 1,
> +};
> +
> +struct gpadc_info {
axp288_adc_info
> + int irq;
> + struct device *dev;
> + struct regmap *regmap;
> +};
> +
> +#define ADC_CHANNEL(_type, _channel, _address, _info_mask) \
AXP288_ADC_CHANNEL
> + { \
> + .indexed = 1, \
> + .type = _type, \
> + .channel = _channel, \
> + .address = _address, \
> + .datasheet_name = "CH"#_channel, \
> + .info_mask_separate = _info_mask, \
> + }
> +
> +static const struct iio_chan_spec const axp288_adc_channels[] = {
> + ADC_CHANNEL(IIO_TEMP, 0, AXP288_TS_ADC_H, 0),
> + ADC_CHANNEL(IIO_TEMP, 1, AXP288_PMIC_ADC_H, 0),
> + ADC_CHANNEL(IIO_TEMP, 2, AXP288_GP_ADC_H, 0),
> + ADC_CHANNEL(IIO_CURRENT, 3, AXP20X_BATT_CHRG_I_H,
> + (BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE))),
> + ADC_CHANNEL(IIO_CURRENT, 4, AXP20X_BATT_DISCHRG_I_H,
> + (BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE))),
> + ADC_CHANNEL(IIO_VOLTAGE, 5, AXP20X_BATT_V_H,
> + (BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE))),
> +};
> +
> +#define ADC_MAP(_adc_channel_label, \
AXP288_ADC_MAP
> + _consumer_dev_name, \
> + _consumer_channel) \
> + { \
> + .adc_channel_label = _adc_channel_label, \
> + .consumer_dev_name = _consumer_dev_name, \
> + .consumer_channel = _consumer_channel, \
> + }
> +
> +/* for consumer drivers */
> +static struct iio_map axp288_iio_default_maps[] = {
axp288_adc_iio_default_maps
> + ADC_MAP("TS_PIN", "axp288-batt", "axp288-batt-temp"),
> + ADC_MAP("PMIC_TEMP", "axp288-pmic", "axp288-pmic-temp"),
> + ADC_MAP("GPADC", "axp288-gpadc", "axp288-system-temp"),
> + ADC_MAP("BATT_CHG_I", "axp288-chrg", "axp288-chrg-curr"),
> + ADC_MAP("BATT_DISCHRG_I", "axp288-chrg", "axp288-chrg-d-curr"),
> + ADC_MAP("BATT_V", "axp288-batt", "axp288-batt-volt"),
> + {},
> +};
> +
> +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 gpadc_info *info = iio_priv(indio_dev);
> + unsigned int th, tl;
> +
> + mutex_lock(&indio_dev->mlock);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + /* special case for GPADC sample */
> + if (chan->address == AXP288_GP_ADC_H)
> + regmap_write(info->regmap, AXP288_ADC_TS_PIN_CTRL,
> + AXP288_ADC_TS_PIN_GPADC);
> + ret = regmap_read(info->regmap, chan->address, &th);
> + if (ret) {
> + dev_err(&indio_dev->dev, "sample raw data high failed\n");
> + break;
> + }
> + ret = regmap_read(info->regmap, chan->address + 1, &tl);
> + if (ret) {
> + dev_err(&indio_dev->dev, "sample raw data low failed\n");
> + break;
> + }
> +
> + *val = (th << 4) + ((tl >> 4) & 0x0F);
> + ret = IIO_VAL_INT;
> + break;
> + case IIO_CHAN_INFO_SCALE:
> + *val = axp288_scale[chan->channel];
either set
*val2 = 0 or
ret = IIO_VAL_INT;
> + ret = IIO_VAL_INT_PLUS_MICRO;
> + break;
> + default:
> + ret = -EINVAL;
> + }
> +
> + if (IIO_CHAN_INFO_RAW && chan->address == AXP288_GP_ADC_H)
> + regmap_write(info->regmap, AXP288_ADC_TS_PIN_CTRL,
> + AXP288_ADC_TS_PIN_ON);
> +
> + mutex_unlock(&indio_dev->mlock);
> +
> + return ret;
> +}
> +
> +static int axp288_gpadc_enable(struct regmap *regmap, bool enable)
axp288_adc_enable()
> +{
> + unsigned int pin_on, adc_en;
> +
> + if (enable) {
> + pin_on = AXP288_ADC_TS_PIN_ON;
> + adc_en = AXP288_ADC_EN_MASK;
> + } else {
> + pin_on = ~AXP288_ADC_TS_PIN_ON;
> + adc_en = ~AXP288_ADC_EN_MASK;
> + }
> + if (regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, pin_on))
> + return -EIO;
> +
> + return regmap_write(regmap, AXP20X_ADC_EN1, ~AXP288_ADC_EN_MASK);
> +}
> +
> +static const struct iio_info axp288_iio_info = {
axp288_adc_iio_info
> + .read_raw = &axp288_adc_read_raw,
> + .driver_module = THIS_MODULE,
> +};
> +
> +static int axp288_gpadc_probe(struct platform_device *pdev)
axp288_adc_probe()
> +{
> + int err;
> + struct gpadc_info *info;
> + struct iio_dev *indio_dev;
> + struct axp2xx_dev *axp2xx = dev_get_drvdata(pdev->dev.parent);
> + int irq;
> +
> + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));
> + if (!indio_dev)
> + return -ENOMEM;
> +
> + info = iio_priv(indio_dev);
> + irq = platform_get_irq(pdev, 0);
could save local irq variable and directly assign to info->irq
> + if (irq < 0) {
> + dev_err(&pdev->dev, "no irq resource?\n");
> + return irq;
> + }
> + info->irq = irq;
> + platform_set_drvdata(pdev, indio_dev);
> + info->regmap = axp2xx->regmap;
> + axp288_gpadc_enable(axp2xx->regmap, true);
> +
> + indio_dev->dev.parent = &pdev->dev;
> + indio_dev->name = pdev->name;
> + indio_dev->channels = axp288_adc_channels;
> + indio_dev->num_channels = ARRAY_SIZE(axp288_adc_channels);
> + indio_dev->info = &axp288_iio_info;
> + indio_dev->modes = INDIO_DIRECT_MODE;
> + /* REVISIT: override default map with platform data */
> + err = iio_map_array_register(indio_dev, axp288_iio_default_maps);
> + if (err)
maybe err < 0, just to be consistent with below
> + goto err_disable_dev;
> +
> + err = iio_device_register(indio_dev);
> + if (err < 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);
> +err_disable_dev:
> + axp288_gpadc_enable(axp2xx->regmap, false);
> + return err;
> +}
> +
> +static int axp288_gpadc_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);
axp288_gpadc_enable(axp2xx->regmap, false);
> +
> + return 0;
> +}
> +
> +static struct platform_driver axp288_gpadc_driver = {
> + .probe = axp288_gpadc_probe,
> + .remove = axp288_gpadc_remove,
> + .driver = {
> + .name = "axp288_adc",
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +module_platform_driver(axp288_gpadc_driver);
> +
> +MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Dollar Cove Xpower AXP288 General Purpose ADC Driver");
X-Power
> +MODULE_LICENSE("GPL");
>
--
Peter Meerwald
+43-664-2444418 (mobile)
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