Merge branch 'ib-mfd-iio-3.19' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd into acpi-pmic

Pull MFD changes that the ACPI PMIC changes depend on from Lee Jones.

3 files changed, 270 insertions, 0 deletions

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 88bdc8f612e2..bc4e787096e8 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_ADC
+	tristate "X-Powers AXP288 ADC driver"
+	depends on MFD_AXP20X
+	help
+	  Say yes here to have support for X-Powers 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 || ARCH_S3C24XX || ARCH_S3C64XX || (OF && COMPILE_TEST)
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index cb88a6a23b8f..f30093f5b67a 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_AD7793) += ad7793.o
 obj-$(CONFIG_AD7887) += ad7887.o
 obj-$(CONFIG_AD799X) += ad799x.o
 obj-$(CONFIG_AT91_ADC) += at91_adc.o
+obj-$(CONFIG_AXP288_ADC) += axp288_adc.o
 obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
 obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
 obj-$(CONFIG_MAX1027) += max1027.o
diff --git a/drivers/iio/adc/axp288_adc.c b/drivers/iio/adc/axp288_adc.c
new file mode 100644
index 000000000000..08bcfb061ca5
--- /dev/null
+++ b/drivers/iio/adc/axp288_adc.c
@@ -0,0 +1,261 @@
+/*
+ * axp288_adc.c - X-Powers AXP288 PMIC ADC 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/axp20x.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,
+};
+
+struct axp288_adc_info {
+	int irq;
+	struct regmap *regmap;
+};
+
+static const struct iio_chan_spec const axp288_adc_channels[] = {
+	{
+		.indexed = 1,
+		.type = IIO_TEMP,
+		.channel = 0,
+		.address = AXP288_TS_ADC_H,
+		.datasheet_name = "TS_PIN",
+	}, {
+		.indexed = 1,
+		.type = IIO_TEMP,
+		.channel = 1,
+		.address = AXP288_PMIC_ADC_H,
+		.datasheet_name = "PMIC_TEMP",
+	}, {
+		.indexed = 1,
+		.type = IIO_TEMP,
+		.channel = 2,
+		.address = AXP288_GP_ADC_H,
+		.datasheet_name = "GPADC",
+	}, {
+		.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_PROCESSED),
+	}, {
+		.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_PROCESSED),
+	}, {
+		.indexed = 1,
+		.type = IIO_VOLTAGE,
+		.channel = 5,
+		.address = AXP20X_BATT_V_H,
+		.datasheet_name = "BATT_V",
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+	},
+};
+
+#define AXP288_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 */
+static struct iio_map axp288_adc_default_maps[] = {
+	AXP288_ADC_MAP("TS_PIN", "axp288-batt", "axp288-batt-temp"),
+	AXP288_ADC_MAP("PMIC_TEMP", "axp288-pmic", "axp288-pmic-temp"),
+	AXP288_ADC_MAP("GPADC", "axp288-gpadc", "axp288-system-temp"),
+	AXP288_ADC_MAP("BATT_CHG_I", "axp288-chrg", "axp288-chrg-curr"),
+	AXP288_ADC_MAP("BATT_DISCHRG_I", "axp288-chrg", "axp288-chrg-d-curr"),
+	AXP288_ADC_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;
+}
+
+static int axp288_adc_set_ts(struct regmap *regmap, unsigned int mode,
+				unsigned long address)
+{
+	/* channels other than GPADC do not need to switch TS pin */
+	if (address != AXP288_GP_ADC_H)
+		return 0;
+
+	return regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, mode);
+}
+
+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->regmap, AXP288_ADC_TS_PIN_GPADC,
+					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->regmap, AXP288_ADC_TS_PIN_ON,
+						chan->address))
+			dev_err(&indio_dev->dev, "TS pin restore\n");
+		break;
+	case IIO_CHAN_INFO_PROCESSED:
+		ret = axp288_adc_read_channel(val, chan->address, info->regmap);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	mutex_unlock(&indio_dev->mlock);
+
+	return ret;
+}
+
+static int axp288_adc_set_state(struct regmap *regmap)
+{
+	/* ADC should be always enabled for internal FG to function */
+	if (regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, AXP288_ADC_TS_PIN_ON))
+		return -EIO;
+
+	return regmap_write(regmap, AXP20X_ADC_EN1, AXP288_ADC_EN_MASK);
+}
+
+static const struct iio_info axp288_adc_iio_info = {
+	.read_raw = &axp288_adc_read_raw,
+	.driver_module = THIS_MODULE,
+};
+
+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) {
+		dev_err(&pdev->dev, "no irq resource?\n");
+		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_set_state(axp20x->regmap);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to enable ADC device\n");
+		return ret;
+	}
+
+	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_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 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");