Hello, > Platform driver for XPowers AXP288 ADC, which is a customized PMIC for Intel XPower's > Baytrail-CR platforms. GPADC device enumerates as one of the PMIC MFD cell > devices. It uses IIO infrastructure to communicate with userspace and > consumer drivers. > > Usages of ADC channels include battery charging and thermal sensors. > > Based on initial work by: > Ramakrishna Pallala <ramakrishna.pallala@xxxxxxxxx> some trivial comments inline > 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 | 250 +++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 259 insertions(+) > create mode 100644 drivers/iio/adc/axp288_gpadc.c > > diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig > index 11b048a..f5c61c0 100644 > --- a/drivers/iio/adc/Kconfig > +++ b/drivers/iio/adc/Kconfig > @@ -279,4 +279,12 @@ config XILINX_XADC > The driver can also be build as a module. If so, the module will be called > xilinx-xadc. > > +config AXP288_GPADC alphabetic order please > + tristate "X-Power AXP288 GPADC driver" XPower > + 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 resisters. resistors > + > endmenu > 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..7ca6bbf > --- /dev/null > +++ b/drivers/iio/adc/axp288_gpadc.c > @@ -0,0 +1,250 @@ > +/* > + * axp288_gpadc.c - Xpower AXP288 PMIC GPADC Driver > + * > + * 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> newline > +#define ADC_EN_MASK 0xF1 > +#define ADC_TS_PIN_GPADC 0xF2 > +#define ADC_TS_PIN_ON 0xF3 use a likely unique prefix for all #defines, functions, e.g. AXP288_ADC_ > + > +struct gpadc_info { > + unsigned int irq; irq is 'int' in _probe() > + struct device *dev; > + struct regmap *regmap; > +}; > + > +#define ADC_CHANNEL(_type, _channel, _address) \ > + { \ > + .indexed = 1, \ > + .type = _type, \ > + .channel = _channel, \ > + .address = _address, \ > + .datasheet_name = "CH"#_channel, \ > + .scan_index = _channel, \ driver doesn't offer buffered interface, so no scan_index, scan_type needed > + .scan_type = { \ > + .sign = 'u', \ > + .realbits = 12, \ > + .storagebits = 32, \ > + .endianness = IIO_LE, \ > + }, \ > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ > + } > + > +static const struct iio_chan_spec const axp288_adc_channels[] = { > + ADC_CHANNEL(IIO_TEMP, 0, AXP288_TS_ADC_H), > + ADC_CHANNEL(IIO_TEMP, 1, AXP288_PMIC_ADC_H), > + ADC_CHANNEL(IIO_TEMP, 2, AXP288_GP_ADC_H), what unit are these values in? IIO wants milli degrees Celsius > + ADC_CHANNEL(IIO_CURRENT, 3, AXP20X_BATT_CHRG_I_H), > + ADC_CHANNEL(IIO_CURRENT, 4, AXP20X_BATT_DISCHRG_I_H), there are no current channels documented in Documentation/ABI/testing/sysfs-bus-iio yet, need to describe what unit? > + ADC_CHANNEL(IIO_VOLTAGE, 5, AXP20X_BATT_V_H), > +}; > + > +#define ADC_MAP(_adc_channel_label, \ > + _consumer_dev_name, \ > + _consumer_channel) \ > + { \ > + .adc_channel_label = _adc_channel_label, \ > + .consumer_dev_name = _consumer_dev_name, \ > + .consumer_channel = _consumer_channel, \ > + } > + > +/* for consumer drivers */ const probably > +static struct iio_map axp288_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 m) > +{ > + int ret; > + struct gpadc_info *info = iio_priv(indio_dev); > + unsigned int th, tl; > + > + mutex_lock(&indio_dev->mlock); > + > + /* special case for GPADC sample */ > + if (chan->address == AXP288_GP_ADC_H) > + regmap_write(info->regmap, AXP288_ADC_TS_PIN_CTRL, > + 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"); > + goto exit_done; > + } > + > + ret = regmap_read(info->regmap, chan->address + 1, &tl); > + if (ret) { > + dev_err(&indio_dev->dev, "sample raw data low failed\n"); > + goto exit_done; > + } > + > + *val = (th << 4) + ((tl >> 4) & 0x0F); > + ret = IIO_VAL_INT; > + > +exit_done: > + if (chan->address == AXP288_GP_ADC_H) > + regmap_write(info->regmap, AXP288_ADC_TS_PIN_CTRL, > + ADC_TS_PIN_ON); > + > + mutex_unlock(&indio_dev->mlock); > + > + return ret; > +} > + > +static int axp288_gpadc_enable(struct regmap *regmap, bool enable) > +{ > + unsigned int pin_on, adc_en; > + > + if (enable) { > + pin_on = ADC_TS_PIN_ON; > + adc_en = ADC_EN_MASK; > + } else { > + pin_on = ~ADC_TS_PIN_ON; > + adc_en = ~ADC_EN_MASK; > + } > + if (regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, pin_on)) > + return -EIO; > + > + return regmap_write(regmap, AXP20X_ADC_EN1, ~ADC_EN_MASK); > +} > + > +static const struct iio_info axp288_iio_info = { > + .read_raw = &axp288_adc_read_raw, > + .driver_module = THIS_MODULE, > +}; > + > +static int axp288_gpadc_probe(struct platform_device *pdev) > +{ > + 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); > + 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) > + 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; > +} > + > +#if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_RUNTIME) > +static int axp288_gpadc_suspend(struct device *dev) > +{ > + int ret; > + struct iio_dev *indio_dev = dev_get_drvdata(dev); > + struct gpadc_info *info = iio_priv(indio_dev); > + > + mutex_lock(&indio_dev->mlock); > + ret = axp288_gpadc_enable(info->regmap, false); > + mutex_unlock(&indio_dev->mlock); > + > + return ret; > +} > + > +static int axp288_gpadc_resume(struct device *dev) > +{ > + int ret; > + struct iio_dev *indio_dev = dev_get_drvdata(dev); > + struct gpadc_info *info = iio_priv(indio_dev); > + > + mutex_lock(&indio_dev->mlock); > + ret = axp288_gpadc_enable(info->regmap, true); > + mutex_unlock(&indio_dev->mlock); > + > + return ret; > +} > +#endif > + > +static UNIVERSAL_DEV_PM_OPS(axp288_gpadc_pm_ops, axp288_gpadc_suspend, > + axp288_gpadc_resume, NULL); > + > +static struct platform_driver axp288_gpadc_driver = { > + .probe = axp288_gpadc_probe, > + .remove = axp288_gpadc_remove, > + .driver = { > + .name = "axp288_adc", > + .owner = THIS_MODULE, > + .pm = &axp288_gpadc_pm_ops, > + }, > +}; > + > +module_platform_driver(axp288_gpadc_driver); > + > +MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>"); > +MODULE_DESCRIPTION("Dollar Cove Xpower AXP288 General Purpose ADC Driver"); > +MODULE_LICENSE("GPL"); > -- Peter Meerwald +43-664-2444418 (mobile) -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html