[PATCH v3 0/3] Add Palmas iio gpadc

[PATCH v3 0/3] Add Palmas iio gpadc

[H. Nikolaus Schaller]

H. Nikolaus Schaller (2):
  iio:adc: add iio driver for Palmas (twl6035/7) gpadc
  ARM: dts: omap5-uevm: enable iio gpadc for Palmas

Marek Belisko (1):
  iio:adc:palmas: add DT support

 .../devicetree/bindings/iio/adc/palmas-gpadc.txt   |  48 ++
 arch/arm/boot/dts/omap5-uevm.dts                   |  10 +
 drivers/iio/adc/Kconfig                            |   8 +
 drivers/iio/adc/Makefile                           |   1 +
 drivers/iio/adc/palmas_gpadc.c                     | 859 +++++++++++++++++++++
 include/linux/mfd/palmas.h                         |  75 +-
 6 files changed, 977 insertions(+), 24 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt
 create mode 100644 drivers/iio/adc/palmas_gpadc.c

-- 
2.5.1

[PATCH v3 1/3] iio:adc: add iio driver for Palmas (twl6035/7) gpadc

[H. Nikolaus Schaller]

This driver code was found as:

https://android.googlesource.com/kernel/tegra/+/aaabb2e045f31e5a970109ffdaae900dd403d17e/drivers/staging/iio/adc

Fixed various compilation issues and test this driver on omap5 evm.

Signed-off-by: Pradeep Goudagunta <pgoudagunta@nvidia.com>
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Marek Belisko <marek@goldelico.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
---
 drivers/iio/adc/Kconfig        |   8 +
 drivers/iio/adc/Makefile       |   1 +
 drivers/iio/adc/palmas_gpadc.c | 817 +++++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/palmas.h     |  75 ++--
 4 files changed, 877 insertions(+), 24 deletions(-)
 create mode 100644 drivers/iio/adc/palmas_gpadc.c

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 50c103d..5100e56 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -264,6 +264,14 @@ config NAU7802
 	  To compile this driver as a module, choose M here: the
 	  module will be called nau7802.
 
+config PALMAS_GPADC
+	tristate "TI Palmas General Purpose ADC"
+	depends on MFD_PALMAS
+	help
+	  Palmas series pmic chip by Texas Instruments (twl6035/6037)
+	  is used in smartphones and tablets and supports a 16 channel
+	  general purpose ADC.
+
 config QCOM_SPMI_IADC
 	tristate "Qualcomm SPMI PMIC current ADC"
 	depends on SPMI
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index a096210..716f112 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_MCP320X) += mcp320x.o
 obj-$(CONFIG_MCP3422) += mcp3422.o
 obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o
 obj-$(CONFIG_NAU7802) += nau7802.o
+obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
 obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o
 obj-$(CONFIG_QCOM_SPMI_VADC) += qcom-spmi-vadc.o
 obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o
diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
new file mode 100644
index 0000000..71763c5
--- /dev/null
+++ b/drivers/iio/adc/palmas_gpadc.c
@@ -0,0 +1,817 @@
+/*
+ * palmas-adc.c -- TI PALMAS GPADC.
+ *
+ * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
+ *
+ * Author: Pradeep Goudagunta <pgoudagunta@nvidia.com>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/pm.h>
+#include <linux/mfd/palmas.h>
+#include <linux/completion.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/machine.h>
+#include <linux/iio/driver.h>
+
+#define MOD_NAME "palmas-gpadc"
+#define PALMAS_ADC_CONVERSION_TIMEOUT	(msecs_to_jiffies(5000))
+#define PALMAS_TO_BE_CALCULATED 0
+#define PALMAS_GPADC_TRIMINVALID	-1
+
+struct palmas_gpadc_info {
+/* calibration codes and regs */
+	int x1;	/* lower ideal code */
+	int x2;	/* higher ideal code */
+	int v1;	/* expected lower volt reading */
+	int v2;	/* expected higher volt reading */
+	u8 trim1_reg;	/* register number for lower trim */
+	u8 trim2_reg;	/* register number for upper trim */
+	int gain;	/* calculated from above (after reading trim regs) */
+	int offset;	/* calculated from above (after reading trim regs) */
+	int gain_error;	/* calculated from above (after reading trim regs) */
+	bool is_uncalibrated;	/* if channel has calibration data */
+};
+
+#define PALMAS_ADC_INFO(_chan, _x1, _x2, _v1, _v2, _t1, _t2, _is_uncalibrated) \
+	[PALMAS_ADC_CH_##_chan] = { \
+		.x1 = _x1, \
+		.x2 = _x2, \
+		.v1 = _v1, \
+		.v2 = _v2, \
+		.gain = PALMAS_TO_BE_CALCULATED, \
+		.offset = PALMAS_TO_BE_CALCULATED, \
+		.gain_error = PALMAS_TO_BE_CALCULATED, \
+		.trim1_reg = PALMAS_GPADC_TRIM##_t1, \
+		.trim2_reg = PALMAS_GPADC_TRIM##_t2,  \
+		.is_uncalibrated = _is_uncalibrated \
+	}
+
+static struct palmas_gpadc_info palmas_gpadc_info[] = {
+	PALMAS_ADC_INFO(IN0, 2064, 3112, 630, 950, 1, 2, false),
+	PALMAS_ADC_INFO(IN1, 2064, 3112, 630, 950, 1, 2, false),
+	PALMAS_ADC_INFO(IN2, 2064, 3112, 1260, 1900, 3, 4, false),
+	PALMAS_ADC_INFO(IN3, 2064, 3112, 630, 950, 1, 2, false),
+	PALMAS_ADC_INFO(IN4, 2064, 3112, 630, 950, 1, 2, false),
+	PALMAS_ADC_INFO(IN5, 2064, 3112, 630, 950, 1, 2, false),
+	PALMAS_ADC_INFO(IN6, 2064, 3112, 2520, 3800, 5, 6, false),
+	PALMAS_ADC_INFO(IN7, 2064, 3112, 2520, 3800, 7, 8, false),
+	PALMAS_ADC_INFO(IN8, 2064, 3112, 3150, 4750, 9, 10, false),
+	PALMAS_ADC_INFO(IN9, 2064, 3112, 5670, 8550, 11, 12, false),
+	PALMAS_ADC_INFO(IN10, 2064, 3112, 3465, 5225, 13, 14, false),
+	PALMAS_ADC_INFO(IN11, 0, 0, 0, 0, INVALID, INVALID, true),
+	PALMAS_ADC_INFO(IN12, 0, 0, 0, 0, INVALID, INVALID, true),
+	PALMAS_ADC_INFO(IN13, 0, 0, 0, 0, INVALID, INVALID, true),
+	PALMAS_ADC_INFO(IN14, 2064, 3112, 3645, 5225, 15, 16, false),
+	PALMAS_ADC_INFO(IN15, 0, 0, 0, 0, INVALID, INVALID, true),
+};
+
+/**
+ * struct palmas_gpadc - the palmas_gpadc structure
+ * @ch0_current:	channel 0 current source setting
+ *			0: 0 uA
+ *			1: 5 uA
+ *			2: 15 uA
+ *			3: 20 uA
+ * @ch3_current:	channel 0 current source setting
+ *			0: 0 uA
+ *			1: 10 uA
+ *			2: 400 uA
+ *			3: 800 uA
+ * @extended_delay:	enable the gpadc extended delay mode
+ * @auto_conversion_period:	define the auto_conversion_period
+ *
+ * This is the palmas_gpadc structure to store run-time information
+ * and pointers for this driver instance.
+ */
+
+struct palmas_gpadc {
+	struct device			*dev;
+	struct palmas			*palmas;
+	u8				ch0_current;
+	u8				ch3_current;
+	bool				extended_delay;
+	int				irq;
+	int				irq_auto_0;
+	int				irq_auto_1;
+	struct palmas_gpadc_info	*adc_info;
+	struct completion		conv_completion;
+	struct palmas_adc_wakeup_property wakeup1_data;
+	struct palmas_adc_wakeup_property wakeup2_data;
+	bool				wakeup1_enable;
+	bool				wakeup2_enable;
+	int				auto_conversion_period;
+};
+
+/*
+ * GPADC lock issue in AUTO mode.
+ * Impact: In AUTO mode, GPADC conversion can be locked after disabling AUTO
+ *	   mode feature.
+ * Details:
+ *	When the AUTO mode is the only conversion mode enabled, if the AUTO
+ *	mode feature is disabled with bit GPADC_AUTO_CTRL.  AUTO_CONV1_EN = 0
+ *	or bit GPADC_AUTO_CTRL.  AUTO_CONV0_EN = 0 during a conversion, the
+ *	conversion mechanism can be seen as locked meaning that all following
+ *	conversion will give 0 as a result.  Bit GPADC_STATUS.GPADC_AVAILABLE
+ *	will stay at 0 meaning that GPADC is busy.  An RT conversion can unlock
+ *	the GPADC.
+ *
+ * Workaround(s):
+ *	To avoid the lock mechanism, the workaround to follow before any stop
+ *	conversion request is:
+ *	Force the GPADC state machine to be ON by using the GPADC_CTRL1.
+ *		GPADC_FORCE bit = 1
+ *	Shutdown the GPADC AUTO conversion using
+ *		GPADC_AUTO_CTRL.SHUTDOWN_CONV[01] = 0.
+ *	After 100us, force the GPADC state machine to be OFF by using the
+ *		GPADC_CTRL1.  GPADC_FORCE bit = 0
+ */
+
+static int palmas_disable_auto_conversion(struct palmas_gpadc *adc)
+{
+	int ret;
+
+	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
+			PALMAS_GPADC_CTRL1,
+			PALMAS_GPADC_CTRL1_GPADC_FORCE,
+			PALMAS_GPADC_CTRL1_GPADC_FORCE);
+	if (ret < 0) {
+		dev_err(adc->dev, "GPADC_CTRL1 update failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
+			PALMAS_GPADC_AUTO_CTRL,
+			PALMAS_GPADC_AUTO_CTRL_SHUTDOWN_CONV1 |
+			PALMAS_GPADC_AUTO_CTRL_SHUTDOWN_CONV0,
+			0);
+	if (ret < 0) {
+		dev_err(adc->dev, "AUTO_CTRL update failed: %d\n", ret);
+		return ret;
+	}
+
+	udelay(100);
+
+	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
+			PALMAS_GPADC_CTRL1,
+			PALMAS_GPADC_CTRL1_GPADC_FORCE, 0);
+	if (ret < 0)
+		dev_err(adc->dev, "GPADC_CTRL1 update failed: %d\n", ret);
+
+	return ret;
+}
+
+static irqreturn_t palmas_gpadc_irq(int irq, void *data)
+{
+	struct palmas_gpadc *adc = data;
+
+	complete(&adc->conv_completion);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t palmas_gpadc_irq_auto(int irq, void *data)
+{
+	struct palmas_gpadc *adc = data;
+
+	dev_dbg(adc->dev, "Threshold interrupt %d occurs\n", irq);
+	palmas_disable_auto_conversion(adc);
+
+	return IRQ_HANDLED;
+}
+
+static int palmas_gpadc_start_mask_interrupt(struct palmas_gpadc *adc,
+						bool mask)
+{
+	int ret;
+
+	if (!mask)
+		ret = palmas_update_bits(adc->palmas, PALMAS_INTERRUPT_BASE,
+					PALMAS_INT3_MASK,
+					PALMAS_INT3_MASK_GPADC_EOC_SW, 0);
+	else
+		ret = palmas_update_bits(adc->palmas, PALMAS_INTERRUPT_BASE,
+					PALMAS_INT3_MASK,
+					PALMAS_INT3_MASK_GPADC_EOC_SW,
+					PALMAS_INT3_MASK_GPADC_EOC_SW);
+	if (ret < 0)
+		dev_err(adc->dev, "GPADC INT MASK update failed: %d\n", ret);
+
+	return ret;
+}
+
+static int palmas_gpadc_enable(struct palmas_gpadc *adc, int adc_chan,
+			       int enable)
+{
+	unsigned int mask, val;
+	int ret;
+
+	if (enable) {
+		val = (adc->extended_delay
+			<< PALMAS_GPADC_RT_CTRL_EXTEND_DELAY_SHIFT);
+		ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
+					PALMAS_GPADC_RT_CTRL,
+					PALMAS_GPADC_RT_CTRL_EXTEND_DELAY, val);
+		if (ret < 0) {
+			dev_err(adc->dev, "RT_CTRL update failed: %d\n", ret);
+			return ret;
+		}
+
+		mask = (PALMAS_GPADC_CTRL1_CURRENT_SRC_CH0_MASK |
+			PALMAS_GPADC_CTRL1_CURRENT_SRC_CH3_MASK |
+			PALMAS_GPADC_CTRL1_GPADC_FORCE);
+		val = (adc->ch0_current
+			<< PALMAS_GPADC_CTRL1_CURRENT_SRC_CH0_SHIFT);
+		val |= (adc->ch3_current
+			<< PALMAS_GPADC_CTRL1_CURRENT_SRC_CH3_SHIFT);
+		val |= PALMAS_GPADC_CTRL1_GPADC_FORCE;
+		ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
+				PALMAS_GPADC_CTRL1, mask, val);
+		if (ret < 0) {
+			dev_err(adc->dev,
+				"Failed to update current setting: %d\n", ret);
+			return ret;
+		}
+
+		mask = (PALMAS_GPADC_SW_SELECT_SW_CONV0_SEL_MASK |
+			PALMAS_GPADC_SW_SELECT_SW_CONV_EN);
+		val = (adc_chan | PALMAS_GPADC_SW_SELECT_SW_CONV_EN);
+		ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
+				PALMAS_GPADC_SW_SELECT, mask, val);
+		if (ret < 0) {
+			dev_err(adc->dev, "SW_SELECT update failed: %d\n", ret);
+			return ret;
+		}
+	} else {
+		ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
+				PALMAS_GPADC_SW_SELECT, 0);
+		if (ret < 0)
+			dev_err(adc->dev, "SW_SELECT write failed: %d\n", ret);
+
+		ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
+				PALMAS_GPADC_CTRL1,
+				PALMAS_GPADC_CTRL1_GPADC_FORCE, 0);
+		if (ret < 0) {
+			dev_err(adc->dev, "CTRL1 update failed: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return ret;
+}
+
+static int palmas_gpadc_read_prepare(struct palmas_gpadc *adc, int adc_chan)
+{
+	int ret;
+
+	ret = palmas_gpadc_enable(adc, adc_chan, true);
+	if (ret < 0)
+		return ret;
+
+	return palmas_gpadc_start_mask_interrupt(adc, 0);
+}
+
+static void palmas_gpadc_read_done(struct palmas_gpadc *adc, int adc_chan)
+{
+	palmas_gpadc_start_mask_interrupt(adc, 1);
+	palmas_gpadc_enable(adc, adc_chan, false);
+}
+
+static int palmas_gpadc_calibrate(struct palmas_gpadc *adc, int adc_chan)
+{
+	int k;
+	int d1;
+	int d2;
+	int ret;
+	int gain;
+	int x1 =  adc->adc_info[adc_chan].x1;
+	int x2 =  adc->adc_info[adc_chan].x2;
+	int v1 = adc->adc_info[adc_chan].v1;
+	int v2 = adc->adc_info[adc_chan].v2;
+
+	ret = palmas_read(adc->palmas, PALMAS_TRIM_GPADC_BASE,
+				adc->adc_info[adc_chan].trim1_reg, &d1);
+	if (ret < 0) {
+		dev_err(adc->dev, "TRIM read failed: %d\n", ret);
+		goto scrub;
+	}
+
+	ret = palmas_read(adc->palmas, PALMAS_TRIM_GPADC_BASE,
+				adc->adc_info[adc_chan].trim2_reg, &d2);
+	if (ret < 0) {
+		dev_err(adc->dev, "TRIM read failed: %d\n", ret);
+		goto scrub;
+	}
+
+	/* gain error calculation */
+	k = (1000 + (1000 * (d2 - d1)) / (x2 - x1));
+
+	/* gain calculation */
+	gain = ((v2 - v1) * 1000) / (x2 - x1);
+
+	adc->adc_info[adc_chan].gain_error = k;
+	adc->adc_info[adc_chan].gain = gain;
+	/* offset Calculation */
+	adc->adc_info[adc_chan].offset = (d1 * 1000) - ((k - 1000) * x1);
+
+scrub:
+	return ret;
+}
+
+static int palmas_gpadc_start_conversion(struct palmas_gpadc *adc, int adc_chan)
+{
+	unsigned int val;
+	int ret;
+
+	init_completion(&adc->conv_completion);
+	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
+				PALMAS_GPADC_SW_SELECT,
+				PALMAS_GPADC_SW_SELECT_SW_START_CONV0,
+				PALMAS_GPADC_SW_SELECT_SW_START_CONV0);
+	if (ret < 0) {
+		dev_err(adc->dev, "SELECT_SW_START write failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = wait_for_completion_timeout(&adc->conv_completion,
+				PALMAS_ADC_CONVERSION_TIMEOUT);
+	if (ret == 0) {
+		dev_err(adc->dev, "conversion not completed\n");
+		return -ETIMEDOUT;
+	}
+
+	ret = palmas_bulk_read(adc->palmas, PALMAS_GPADC_BASE,
+				PALMAS_GPADC_SW_CONV0_LSB, &val, 2);
+	if (ret < 0) {
+		dev_err(adc->dev, "SW_CONV0_LSB read failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = val & 0xFFF;
+
+	return ret;
+}
+
+static int palmas_gpadc_get_calibrated_code(struct palmas_gpadc *adc,
+						int adc_chan, int val)
+{
+	if (!adc->adc_info[adc_chan].is_uncalibrated)
+		val  = (val*1000 - adc->adc_info[adc_chan].offset) /
+					adc->adc_info[adc_chan].gain_error;
+
+	if (val < 0) {
+		dev_err(adc->dev, "Mismatch with calibration\n");
+		return 0;
+	}
+
+	val = (val * adc->adc_info[adc_chan].gain) / 1000;
+
+	return val;
+}
+
+static int palmas_gpadc_read_raw(struct iio_dev *indio_dev,
+	struct iio_chan_spec const *chan, int *val, int *val2, long mask)
+{
+	struct  palmas_gpadc *adc = iio_priv(indio_dev);
+	int adc_chan = chan->channel;
+	int ret = 0;
+
+	if (adc_chan > PALMAS_ADC_CH_MAX)
+		return -EINVAL;
+
+	mutex_lock(&indio_dev->mlock);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+	case IIO_CHAN_INFO_PROCESSED:
+		ret = palmas_gpadc_read_prepare(adc, adc_chan);
+		if (ret < 0)
+			goto out;
+
+		ret = palmas_gpadc_start_conversion(adc, adc_chan);
+		if (ret < 0) {
+			dev_err(adc->dev,
+			"ADC start conversion failed\n");
+			goto out;
+		}
+
+		if (mask == IIO_CHAN_INFO_PROCESSED)
+			ret = palmas_gpadc_get_calibrated_code(
+							adc, adc_chan, ret);
+
+		*val = ret;
+
+		ret = IIO_VAL_INT;
+		goto out;
+	}
+
+	mutex_unlock(&indio_dev->mlock);
+	return ret;
+
+out:
+	palmas_gpadc_read_done(adc, adc_chan);
+	mutex_unlock(&indio_dev->mlock);
+
+	return ret;
+}
+
+static const struct iio_info palmas_gpadc_iio_info = {
+	.read_raw = palmas_gpadc_read_raw,
+	.driver_module = THIS_MODULE,
+};
+
+#define PALMAS_ADC_CHAN_IIO(chan, _type, chan_info)	\
+{							\
+	.datasheet_name = PALMAS_DATASHEET_NAME(chan),	\
+	.type = _type,					\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	\
+			BIT(chan_info),			\
+	.indexed = 1,					\
+	.channel = PALMAS_ADC_CH_##chan,		\
+}
+
+static const struct iio_chan_spec palmas_gpadc_iio_channel[] = {
+	PALMAS_ADC_CHAN_IIO(IN0, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
+	PALMAS_ADC_CHAN_IIO(IN1, IIO_TEMP, IIO_CHAN_INFO_RAW),
+	PALMAS_ADC_CHAN_IIO(IN2, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
+	PALMAS_ADC_CHAN_IIO(IN3, IIO_TEMP, IIO_CHAN_INFO_RAW),
+	PALMAS_ADC_CHAN_IIO(IN4, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
+	PALMAS_ADC_CHAN_IIO(IN5, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
+	PALMAS_ADC_CHAN_IIO(IN6, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
+	PALMAS_ADC_CHAN_IIO(IN7, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
+	PALMAS_ADC_CHAN_IIO(IN8, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
+	PALMAS_ADC_CHAN_IIO(IN9, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
+	PALMAS_ADC_CHAN_IIO(IN10, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
+	PALMAS_ADC_CHAN_IIO(IN11, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
+	PALMAS_ADC_CHAN_IIO(IN12, IIO_TEMP, IIO_CHAN_INFO_RAW),
+	PALMAS_ADC_CHAN_IIO(IN13, IIO_TEMP, IIO_CHAN_INFO_RAW),
+	PALMAS_ADC_CHAN_IIO(IN14, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
+	PALMAS_ADC_CHAN_IIO(IN15, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
+};
+
+static int palmas_gpadc_probe(struct platform_device *pdev)
+{
+	struct palmas_gpadc *adc;
+	struct palmas_platform_data *pdata;
+	struct palmas_gpadc_platform_data *gpadc_pdata = NULL;
+	struct iio_dev *indio_dev;
+	int ret, i;
+
+	pdata = dev_get_platdata(pdev->dev.parent);
+	if (!pdata || !pdata->gpadc_pdata) {
+		dev_err(&pdev->dev, "No platform data\n");
+		return -ENODEV;
+	}
+
+	gpadc_pdata = pdata->gpadc_pdata;
+
+	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc));
+	if (!indio_dev) {
+		dev_err(&pdev->dev, "iio_device_alloc failed\n");
+		return -ENOMEM;
+	}
+
+	adc = iio_priv(indio_dev);
+	adc->dev = &pdev->dev;
+	adc->palmas = dev_get_drvdata(pdev->dev.parent);
+	adc->adc_info = palmas_gpadc_info;
+	init_completion(&adc->conv_completion);
+	dev_set_drvdata(&pdev->dev, indio_dev);
+
+	adc->auto_conversion_period = gpadc_pdata->auto_conversion_period_ms;
+	adc->irq = palmas_irq_get_virq(adc->palmas, PALMAS_GPADC_EOC_SW_IRQ);
+	if (adc->irq < 0) {
+		dev_err(adc->dev,
+			"get virq failed: %d\n", adc->irq);
+		ret = adc->irq;
+		goto out;
+	}
+	ret = request_threaded_irq(adc->irq, NULL,
+		palmas_gpadc_irq,
+		IRQF_ONESHOT | IRQF_EARLY_RESUME, dev_name(adc->dev),
+		adc);
+	if (ret < 0) {
+		dev_err(adc->dev,
+			"request irq %d failed: %d\n", adc->irq, ret);
+		goto out;
+	}
+
+	if (gpadc_pdata->adc_wakeup1_data) {
+		memcpy(&adc->wakeup1_data, gpadc_pdata->adc_wakeup1_data,
+			sizeof(adc->wakeup1_data));
+		adc->wakeup1_enable = true;
+		adc->irq_auto_0 =  platform_get_irq(pdev, 1);
+		ret = request_threaded_irq(adc->irq_auto_0, NULL,
+				palmas_gpadc_irq_auto,
+				IRQF_ONESHOT | IRQF_EARLY_RESUME,
+				"palmas-adc-auto-0", adc);
+		if (ret < 0) {
+			dev_err(adc->dev, "request auto0 irq %d failed: %d\n",
+				adc->irq_auto_0, ret);
+			goto out_irq_free;
+		}
+	}
+
+	if (gpadc_pdata->adc_wakeup2_data) {
+		memcpy(&adc->wakeup2_data, gpadc_pdata->adc_wakeup2_data,
+				sizeof(adc->wakeup2_data));
+		adc->wakeup2_enable = true;
+		adc->irq_auto_1 =  platform_get_irq(pdev, 2);
+		ret = request_threaded_irq(adc->irq_auto_1, NULL,
+				palmas_gpadc_irq_auto,
+				IRQF_ONESHOT | IRQF_EARLY_RESUME,
+				"palmas-adc-auto-1", adc);
+		if (ret < 0) {
+			dev_err(adc->dev, "request auto1 irq %d failed: %d\n",
+				adc->irq_auto_1, ret);
+			goto out_irq_auto0_free;
+		}
+	}
+
+	/* set the current source 0 (value 0/5/15/20 uA => 0..3) */
+	if (gpadc_pdata->ch0_current <= 1)
+		adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_0;
+	else if (gpadc_pdata->ch0_current <= 5)
+		adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_5;
+	else if (gpadc_pdata->ch0_current <= 15)
+		adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_15;
+	else
+		adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_20;
+
+	/* set the current source 3 (value 0/10/400/800 uA => 0..3) */
+	if (gpadc_pdata->ch3_current <= 1)
+		adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_0;
+	else if (gpadc_pdata->ch3_current <= 10)
+		adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_10;
+	else if (gpadc_pdata->ch3_current <= 400)
+		adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_400;
+	else
+		adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_800;
+
+	adc->extended_delay = gpadc_pdata->extended_delay;
+
+	indio_dev->name = MOD_NAME;
+	indio_dev->dev.parent = &pdev->dev;
+	indio_dev->info = &palmas_gpadc_iio_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = palmas_gpadc_iio_channel;
+	indio_dev->num_channels = ARRAY_SIZE(palmas_gpadc_iio_channel);
+
+	ret = iio_device_register(indio_dev);
+	if (ret < 0) {
+		dev_err(adc->dev, "iio_device_register() failed: %d\n", ret);
+		goto out_irq_auto1_free;
+	}
+
+	device_set_wakeup_capable(&pdev->dev, 1);
+	for (i = 0; i < PALMAS_ADC_CH_MAX; i++) {
+		if (!(adc->adc_info[i].is_uncalibrated))
+			palmas_gpadc_calibrate(adc, i);
+	}
+
+	if (adc->wakeup1_enable || adc->wakeup2_enable)
+		device_wakeup_enable(&pdev->dev);
+
+	return 0;
+
+out_irq_auto1_free:
+	if (gpadc_pdata->adc_wakeup2_data)
+		free_irq(adc->irq_auto_1, adc);
+out_irq_auto0_free:
+	if (gpadc_pdata->adc_wakeup1_data)
+		free_irq(adc->irq_auto_0, adc);
+out_irq_free:
+	free_irq(adc->irq, adc);
+out:
+	return ret;
+}
+
+static int palmas_gpadc_remove(struct platform_device *pdev)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(&pdev->dev);
+	struct palmas_gpadc *adc = iio_priv(indio_dev);
+
+	if (adc->wakeup1_enable || adc->wakeup2_enable)
+		device_wakeup_disable(&pdev->dev);
+	iio_device_unregister(indio_dev);
+	free_irq(adc->irq, adc);
+	if (adc->wakeup1_enable)
+		free_irq(adc->irq_auto_0, adc);
+	if (adc->wakeup2_enable)
+		free_irq(adc->irq_auto_1, adc);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int palmas_adc_wakeup_configure(struct palmas_gpadc *adc)
+{
+	int adc_period, conv;
+	int i;
+	int ch0 = 0, ch1 = 0;
+	int thres;
+	int ret;
+
+	adc_period = adc->auto_conversion_period;
+	for (i = 0; i < 16; ++i) {
+		if (((1000 * (1 << i)) / 32) < adc_period)
+			continue;
+	}
+	if (i > 0)
+		i--;
+	adc_period = i;
+	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
+			PALMAS_GPADC_AUTO_CTRL,
+			PALMAS_GPADC_AUTO_CTRL_COUNTER_CONV_MASK,
+			adc_period);
+	if (ret < 0) {
+		dev_err(adc->dev, "AUTO_CTRL write failed: %d\n", ret);
+		return ret;
+	}
+
+	conv = 0;
+	if (adc->wakeup1_enable) {
+		int polarity;
+
+		ch0 = adc->wakeup1_data.adc_channel_number;
+		conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV0_EN;
+		if (adc->wakeup1_data.adc_high_threshold > 0) {
+			thres = adc->wakeup1_data.adc_high_threshold;
+			polarity = 0;
+		} else {
+			thres = adc->wakeup1_data.adc_low_threshold;
+			polarity = PALMAS_GPADC_THRES_CONV0_MSB_THRES_CONV0_POL;
+		}
+
+		ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
+				PALMAS_GPADC_THRES_CONV0_LSB, thres & 0xFF);
+		if (ret < 0) {
+			dev_err(adc->dev,
+				"THRES_CONV0_LSB write failed: %d\n", ret);
+			return ret;
+		}
+
+		ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
+				PALMAS_GPADC_THRES_CONV0_MSB,
+				((thres >> 8) & 0xF) | polarity);
+		if (ret < 0) {
+			dev_err(adc->dev,
+				"THRES_CONV0_MSB write failed: %d\n", ret);
+			return ret;
+		}
+	}
+
+	if (adc->wakeup2_enable) {
+		int polarity;
+
+		ch1 = adc->wakeup2_data.adc_channel_number;
+		conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV1_EN;
+		if (adc->wakeup2_data.adc_high_threshold > 0) {
+			thres = adc->wakeup2_data.adc_high_threshold;
+			polarity = 0;
+		} else {
+			thres = adc->wakeup2_data.adc_low_threshold;
+			polarity = PALMAS_GPADC_THRES_CONV1_MSB_THRES_CONV1_POL;
+		}
+
+		ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
+				PALMAS_GPADC_THRES_CONV1_LSB, thres & 0xFF);
+		if (ret < 0) {
+			dev_err(adc->dev,
+				"THRES_CONV1_LSB write failed: %d\n", ret);
+			return ret;
+		}
+
+		ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
+				PALMAS_GPADC_THRES_CONV1_MSB,
+				((thres >> 8) & 0xF) | polarity);
+		if (ret < 0) {
+			dev_err(adc->dev,
+				"THRES_CONV1_MSB write failed: %d\n", ret);
+			return ret;
+		}
+	}
+
+	ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
+			PALMAS_GPADC_AUTO_SELECT, (ch1 << 4) | ch0);
+	if (ret < 0) {
+		dev_err(adc->dev, "AUTO_SELECT write failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
+			PALMAS_GPADC_AUTO_CTRL,
+			PALMAS_GPADC_AUTO_CTRL_AUTO_CONV1_EN |
+			PALMAS_GPADC_AUTO_CTRL_AUTO_CONV0_EN, conv);
+	if (ret < 0)
+		dev_err(adc->dev, "AUTO_CTRL write failed: %d\n", ret);
+
+	return ret;
+}
+
+static int palmas_adc_wakeup_reset(struct palmas_gpadc *adc)
+{
+	int ret;
+
+	ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
+			PALMAS_GPADC_AUTO_SELECT, 0);
+	if (ret < 0) {
+		dev_err(adc->dev, "AUTO_SELECT write failed: %d\n", ret);
+		return ret;
+	}
+
+	ret = palmas_disable_auto_conversion(adc);
+	if (ret < 0)
+		dev_err(adc->dev, "Disable auto conversion failed: %d\n", ret);
+
+	return ret;
+}
+
+static int palmas_gpadc_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct palmas_gpadc *adc = iio_priv(indio_dev);
+	int wakeup = adc->wakeup1_enable || adc->wakeup2_enable;
+	int ret;
+
+	if (!device_may_wakeup(dev) || !wakeup)
+		return 0;
+
+	ret = palmas_adc_wakeup_configure(adc);
+	if (ret < 0)
+		return ret;
+
+	if (adc->wakeup1_enable)
+		enable_irq_wake(adc->irq_auto_0);
+
+	if (adc->wakeup2_enable)
+		enable_irq_wake(adc->irq_auto_1);
+
+	return 0;
+}
+
+static int palmas_gpadc_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct palmas_gpadc *adc = iio_priv(indio_dev);
+	int wakeup = adc->wakeup1_enable || adc->wakeup2_enable;
+	int ret;
+
+	if (!device_may_wakeup(dev) || !wakeup)
+		return 0;
+
+	ret = palmas_adc_wakeup_reset(adc);
+	if (ret < 0)
+		return ret;
+
+	if (adc->wakeup1_enable)
+		disable_irq_wake(adc->irq_auto_0);
+
+	if (adc->wakeup2_enable)
+		disable_irq_wake(adc->irq_auto_1);
+
+	return 0;
+};
+#endif
+
+static const struct dev_pm_ops palmas_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(palmas_gpadc_suspend,
+				palmas_gpadc_resume)
+};
+
+static struct platform_driver palmas_gpadc_driver = {
+	.probe = palmas_gpadc_probe,
+	.remove = palmas_gpadc_remove,
+	.driver = {
+		.name = MOD_NAME,
+		.pm = &palmas_pm_ops,
+	},
+};
+
+static int __init palmas_gpadc_init(void)
+{
+	return platform_driver_register(&palmas_gpadc_driver);
+}
+module_init(palmas_gpadc_init);
+
+static void __exit palmas_gpadc_exit(void)
+{
+	platform_driver_unregister(&palmas_gpadc_driver);
+}
+module_exit(palmas_gpadc_exit);
+
+MODULE_DESCRIPTION("palmas GPADC driver");
+MODULE_AUTHOR("Pradeep Goudagunta<pgoudagunta@nvidia.com>");
+MODULE_ALIAS("platform:palmas-gpadc");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h
index 13e1d96..c800dbc 100644
--- a/include/linux/mfd/palmas.h
+++ b/include/linux/mfd/palmas.h
@@ -134,21 +134,32 @@ struct palmas_pmic_driver_data {
 			    struct regulator_config config);
 };
 
+struct palmas_adc_wakeup_property {
+	int adc_channel_number;
+	int adc_high_threshold;
+	int adc_low_threshold;
+};
+
 struct palmas_gpadc_platform_data {
 	/* Channel 3 current source is only enabled during conversion */
-	int ch3_current;
+	int ch3_current;	/* 0: off; 1: 10uA; 2: 400uA; 3: 800 uA */
 
 	/* Channel 0 current source can be used for battery detection.
 	 * If used for battery detection this will cause a permanent current
 	 * consumption depending on current level set here.
 	 */
-	int ch0_current;
+	int ch0_current;	/* 0: off; 1: 5uA; 2: 15uA; 3: 20 uA */
+	bool extended_delay;	/* use extended delay for conversion */
 
 	/* default BAT_REMOVAL_DAT setting on device probe */
 	int bat_removal;
 
 	/* Sets the START_POLARITY bit in the RT_CTRL register */
 	int start_polarity;
+
+	int auto_conversion_period_ms;
+	struct palmas_adc_wakeup_property *adc_wakeup1_data;
+	struct palmas_adc_wakeup_property *adc_wakeup2_data;
 };
 
 struct palmas_reg_init {
@@ -405,28 +416,7 @@ struct palmas_gpadc_calibration {
 	s32 offset_error;
 };
 
-struct palmas_gpadc {
-	struct device *dev;
-	struct palmas *palmas;
-
-	int ch3_current;
-	int ch0_current;
-
-	int gpadc_force;
-
-	int bat_removal;
-
-	struct mutex reading_lock;
-	struct completion irq_complete;
-
-	int eoc_sw_irq;
-
-	struct palmas_gpadc_calibration *palmas_cal_tbl;
-
-	int conv0_channel;
-	int conv1_channel;
-	int rt_channel;
-};
+#define PALMAS_DATASHEET_NAME(_name)	"palmas-gpadc-chan-"#_name
 
 struct palmas_gpadc_result {
 	s32 raw_code;
@@ -520,6 +510,43 @@ enum palmas_irqs {
 	PALMAS_NUM_IRQ,
 };
 
+/* Palmas GPADC Channels */
+enum {
+	PALMAS_ADC_CH_IN0,
+	PALMAS_ADC_CH_IN1,
+	PALMAS_ADC_CH_IN2,
+	PALMAS_ADC_CH_IN3,
+	PALMAS_ADC_CH_IN4,
+	PALMAS_ADC_CH_IN5,
+	PALMAS_ADC_CH_IN6,
+	PALMAS_ADC_CH_IN7,
+	PALMAS_ADC_CH_IN8,
+	PALMAS_ADC_CH_IN9,
+	PALMAS_ADC_CH_IN10,
+	PALMAS_ADC_CH_IN11,
+	PALMAS_ADC_CH_IN12,
+	PALMAS_ADC_CH_IN13,
+	PALMAS_ADC_CH_IN14,
+	PALMAS_ADC_CH_IN15,
+	PALMAS_ADC_CH_MAX,
+};
+
+/* Palmas GPADC Channel0 Current Source */
+enum {
+	PALMAS_ADC_CH0_CURRENT_SRC_0,
+	PALMAS_ADC_CH0_CURRENT_SRC_5,
+	PALMAS_ADC_CH0_CURRENT_SRC_15,
+	PALMAS_ADC_CH0_CURRENT_SRC_20,
+};
+
+/* Palmas GPADC Channel3 Current Source */
+enum {
+	PALMAS_ADC_CH3_CURRENT_SRC_0,
+	PALMAS_ADC_CH3_CURRENT_SRC_10,
+	PALMAS_ADC_CH3_CURRENT_SRC_400,
+	PALMAS_ADC_CH3_CURRENT_SRC_800,
+};
+
 struct palmas_pmic {
 	struct palmas *palmas;
 	struct device *dev;
-- 
2.5.1

[PATCH v3 2/3] iio:adc:palmas: add DT support

[H. Nikolaus Schaller]

From: Marek Belisko <marek@goldelico.com>

Code was found at:
https://android.googlesource.com/kernel/tegra/+/a90856a6626d502d42c6e7abccbdf9d730b36270%5E%21/#F1

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Marek Belisko <marek@goldelico.com> [Fixed minor typos + add channels list to documentation]
---
 .../devicetree/bindings/iio/adc/palmas-gpadc.txt   | 48 ++++++++++++++++++++
 drivers/iio/adc/palmas_gpadc.c                     | 52 +++++++++++++++++++---
 2 files changed, 95 insertions(+), 5 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt

diff --git a/Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt b/Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt
new file mode 100644
index 0000000..a6de996
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt
@@ -0,0 +1,48 @@
+* Palmas general purpose ADC IP block devicetree bindings
+
+Channels list:
+	0 battery type
+	1 battery temp NTC (optional current source)
+	2 GP
+	3 temp (with ext. diode, optional current source)
+	4 GP
+	5 GP
+	6 VBAT_SENSE
+	7 VCC_SENSE
+	8 Backup Battery voltage
+	9 external charger (VCHG)
+	10 VBUS
+	11 DC-DC current probe (how does this work?)
+	12 internal die temp
+	13 internal die temp
+	14 USB ID pin voltage
+	15 test network
+
+Required properties:
+- compatible : Must be "ti,palmas-gpadc".
+- #io-channel-cells: Should be set to <1>.
+
+Optional sub-nodes:
+ti,channel0-current-microamp: Channel 0 current in uA.
+	Values are rounded to derive 0uA, 5uA, 15uA, 20uA.
+ti,channel3-current-microamp: Channel 3 current in uA.
+	Valid are rounded to derive 0uA, 10uA, 400uA, 800uA.
+ti,enable-extended-delay: Enable extended delay.
+
+Example:
+
+pmic {
+	compatible = "ti,twl6035-pmic", "ti,palmas-pmic";
+	...
+	gpadc {
+		compatible = "ti,palmas-gpadc";
+		interrupts = <18 0
+			      16 0
+			      17 0>;
+		#io-channel-cells = <1>;
+		ti,channel0-current-microamp = <5>;
+		ti,channel3-current-microamp = <10>;
+		};
+	};
+	...
+};
diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
index 71763c5..f42eb8a 100644
--- a/drivers/iio/adc/palmas_gpadc.c
+++ b/drivers/iio/adc/palmas_gpadc.c
@@ -21,6 +21,8 @@
 #include <linux/pm.h>
 #include <linux/mfd/palmas.h>
 #include <linux/completion.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/machine.h>
 #include <linux/iio/driver.h>
@@ -460,6 +462,34 @@ static const struct iio_chan_spec palmas_gpadc_iio_channel[] = {
 	PALMAS_ADC_CHAN_IIO(IN15, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 };
 
+static int palmas_gpadc_get_adc_dt_data(struct platform_device *pdev,
+	struct palmas_gpadc_platform_data **gpadc_pdata)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct palmas_gpadc_platform_data *gp_data;
+	int ret;
+	u32 pval;
+
+	gp_data = devm_kzalloc(&pdev->dev, sizeof(*gp_data), GFP_KERNEL);
+	if (!gp_data)
+		return -ENOMEM;
+
+	ret = of_property_read_u32(np, "ti,channel0-current-microamp", &pval);
+	if (!ret)
+		gp_data->ch0_current = pval;
+
+	ret = of_property_read_u32(np, "ti,channel3-current-microamp", &pval);
+	if (!ret)
+		gp_data->ch3_current = pval;
+
+	gp_data->extended_delay = of_property_read_bool(np,
+					"ti,enable-extended-delay");
+
+	*gpadc_pdata = gp_data;
+
+	return 0;
+}
+
 static int palmas_gpadc_probe(struct platform_device *pdev)
 {
 	struct palmas_gpadc *adc;
@@ -469,12 +499,17 @@ static int palmas_gpadc_probe(struct platform_device *pdev)
 	int ret, i;
 
 	pdata = dev_get_platdata(pdev->dev.parent);
-	if (!pdata || !pdata->gpadc_pdata) {
-		dev_err(&pdev->dev, "No platform data\n");
-		return -ENODEV;
-	}
 
-	gpadc_pdata = pdata->gpadc_pdata;
+	if (pdata && pdata->gpadc_pdata)
+		gpadc_pdata = pdata->gpadc_pdata;
+
+	if (!gpadc_pdata && pdev->dev.of_node) {
+		ret = palmas_gpadc_get_adc_dt_data(pdev, &gpadc_pdata);
+		if (ret < 0)
+			return ret;
+	}
+	if (!gpadc_pdata)
+		return -EINVAL;
 
 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc));
 	if (!indio_dev) {
@@ -790,12 +825,19 @@ static const struct dev_pm_ops palmas_pm_ops = {
 				palmas_gpadc_resume)
 };
 
+static const struct of_device_id of_palmas_gpadc_match_tbl[] = {
+	{ .compatible = "ti,palmas-gpadc", },
+	{ /* end */ }
+};
+MODULE_DEVICE_TABLE(of, of_palmas_gpadc_match_tbl);
+
 static struct platform_driver palmas_gpadc_driver = {
 	.probe = palmas_gpadc_probe,
 	.remove = palmas_gpadc_remove,
 	.driver = {
 		.name = MOD_NAME,
 		.pm = &palmas_pm_ops,
+		.of_match_table = of_palmas_gpadc_match_tbl,
 	},
 };
 
-- 
2.5.1

[PATCH v3 3/3] ARM: dts: omap5-uevm: enable iio gpadc for Palmas

[H. Nikolaus Schaller]

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
---
 arch/arm/boot/dts/omap5-uevm.dts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/omap5-uevm.dts b/arch/arm/boot/dts/omap5-uevm.dts
index 0e8128b..63f81bb 100644
--- a/arch/arm/boot/dts/omap5-uevm.dts
+++ b/arch/arm/boot/dts/omap5-uevm.dts
@@ -342,6 +342,16 @@
 
 			ti,ldo6-vibrator;
 
+			gpadc {
+				compatible = "ti,palmas-gpadc";
+				interrupts = <18 0
+					      16 0
+					      17 0>;
+				#io-channel-cells = <1>;
+				ti,channel0-current-microamp = <5>;
+				ti,channel3-current-microamp = <10>;
+			};
+
 			regulators {
 				smps123_reg: smps123 {
 					/* VDD_OPP_MPU */
-- 
2.5.1

Re: [PATCH v3 2/3] iio:adc:palmas: add DT support

[Lars-Peter Clausen]

On 10/16/2015 02:53 PM, H. Nikolaus Schaller wrote:
[...]
> +Optional sub-nodes:
> +ti,channel0-current-microamp: Channel 0 current in uA.
> +	Values are rounded to derive 0uA, 5uA, 15uA, 20uA.
> +ti,channel3-current-microamp: Channel 3 current in uA.
> +	Valid are rounded to derive 0uA, 10uA, 400uA, 800uA.
> +ti,enable-extended-delay: Enable extended delay.

Those three above sound more like configuration policy, rather than hardware
description. What influence which values should be chosen?

Re: [PATCH v3 2/3] iio:adc:palmas: add DT support

[H. Nikolaus Schaller]

Am 19.10.2015 um 13:57 schrieb Lars-Peter Clausen <lars@metafoo.de>:

> On 10/16/2015 02:53 PM, H. Nikolaus Schaller wrote:
> [...]
>> +Optional sub-nodes:
>> +ti,channel0-current-microamp: Channel 0 current in uA.
>> +	Values are rounded to derive 0uA, 5uA, 15uA, 20uA.
>> +ti,channel3-current-microamp: Channel 3 current in uA.
>> +	Valid are rounded to derive 0uA, 10uA, 400uA, 800uA.
>> +ti,enable-extended-delay: Enable extended delay.
> 
> Those three above sound more like configuration policy, rather than hardware
> description. What influence which values should be chosen?

e.g. the nominal value of the NTC that can be connected if the Palmas
is hooked up in a standard way.

If a board has no NTC and uses channel0 for a different purpose one
should choose 0uA.

If it is let's say 10kOhm it should probably be 20uA to give a nominal voltage
reading of 200mV.

100kOhm will give 2V which is at the limit of the ADC input range and
therefore it would be better to choose 15uA or 5uA.

I think choosing extended delay depends on the noisiness of the input
signal but I am not a specialist for this feature.

So I would say the board hardware mandates some specific value.

BR,
Nikolaus

Re: [PATCH v3 3/3] ARM: dts: omap5-uevm: enable iio gpadc for Palmas

[Tony Lindgren]

Hi,

* H. Nikolaus Schaller <hns@goldelico.com> [151016 05:58]:
> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
> ---
>  arch/arm/boot/dts/omap5-uevm.dts | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/omap5-uevm.dts b/arch/arm/boot/dts/omap5-uevm.dts
> index 0e8128b..63f81bb 100644
> --- a/arch/arm/boot/dts/omap5-uevm.dts
> +++ b/arch/arm/boot/dts/omap5-uevm.dts
> @@ -342,6 +342,16 @@
>  
>  			ti,ldo6-vibrator;
>  
> +			gpadc {
> +				compatible = "ti,palmas-gpadc";
> +				interrupts = <18 0
> +					      16 0
> +					      17 0>;
> +				#io-channel-cells = <1>;
> +				ti,channel0-current-microamp = <5>;
> +				ti,channel3-current-microamp = <10>;
> +			};
> +
>  			regulators {
>  				smps123_reg: smps123 {
>  					/* VDD_OPP_MPU */

FYI, please send this one separately once the binding and driver is
merged.

This need to be updated arch/arm/boot/dts/omap5-board-common.dts, so
this will cause merge conflicts if applied with the driver.

Regards,

Tony

Re: [PATCH v3 3/3] ARM: dts: omap5-uevm: enable iio gpadc for Palmas

[H. Nikolaus Schaller]

Hi,

Am 20.10.2015 um 18:24 schrieb Tony Lindgren <tony@atomide.com>:

> Hi,
> 
> * H. Nikolaus Schaller <hns@goldelico.com> [151016 05:58]:
>> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
>> ---
>> arch/arm/boot/dts/omap5-uevm.dts | 10 ++++++++++
>> 1 file changed, 10 insertions(+)
>> 
>> diff --git a/arch/arm/boot/dts/omap5-uevm.dts b/arch/arm/boot/dts/omap5-uevm.dts
>> index 0e8128b..63f81bb 100644
>> --- a/arch/arm/boot/dts/omap5-uevm.dts
>> +++ b/arch/arm/boot/dts/omap5-uevm.dts
>> @@ -342,6 +342,16 @@
>> 
>> 			ti,ldo6-vibrator;
>> 
>> +			gpadc {
>> +				compatible = "ti,palmas-gpadc";
>> +				interrupts = <18 0
>> +					      16 0
>> +					      17 0>;
>> +				#io-channel-cells = <1>;
>> +				ti,channel0-current-microamp = <5>;
>> +				ti,channel3-current-microamp = <10>;
>> +			};
>> +
>> 			regulators {
>> 				smps123_reg: smps123 {
>> 					/* VDD_OPP_MPU */
> 
> FYI, please send this one separately once the binding and driver is
> merged.
> 
> This need to be updated arch/arm/boot/dts/omap5-board-common.dts, so
> this will cause merge conflicts if applied with the driver.

Ok!

We have our own OMAP5 board in the pipeline and there it will help
as well to rebase it using arch/arm/boot/dts/omap5-board-common.dts

BR,
Nikolaus

Re: [PATCH v3 3/3] ARM: dts: omap5-uevm: enable iio gpadc for Palmas

[Tony Lindgren]

* H. Nikolaus Schaller <hns@goldelico.com> [151020 09:48]:
> 
> We have our own OMAP5 board in the pipeline and there it will help
> as well to rebase it using arch/arm/boot/dts/omap5-board-common.dts

Yes and then we can hopefully fix up the regulators properly and get
rid of the fixed-regulator flags..

Regards,

Tony

Re: [PATCH v3 1/3] iio:adc: add iio driver for Palmas (twl6035/7) gpadc

[Jonathan Cameron]

On 16/10/15 13:53, H. Nikolaus Schaller wrote:
> This driver code was found as:
> 
> https://android.googlesource.com/kernel/tegra/+/aaabb2e045f31e5a970109ffdaae900dd403d17e/drivers/staging/iio/adc
> 
> Fixed various compilation issues and test this driver on omap5 evm.
> 
> Signed-off-by: Pradeep Goudagunta <pgoudagunta@nvidia.com>
> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
> Signed-off-by: Marek Belisko <marek@goldelico.com>
> Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
> Reviewed-by: Jonathan Cameron <jic23@kernel.org>
> Acked-by: Lee Jones <lee.jones@linaro.org>
Applied to the togreg branch of iio.git - initially pushed out as testing.
Unfortunately the timing is such that it's not going to make the upcoming
merge window so will be an early entry to linux-next after the merge window
closes.

Jonathan
> ---
>  drivers/iio/adc/Kconfig        |   8 +
>  drivers/iio/adc/Makefile       |   1 +
>  drivers/iio/adc/palmas_gpadc.c | 817 +++++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/palmas.h     |  75 ++--
>  4 files changed, 877 insertions(+), 24 deletions(-)
>  create mode 100644 drivers/iio/adc/palmas_gpadc.c
> 
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 50c103d..5100e56 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -264,6 +264,14 @@ config NAU7802
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called nau7802.
>  
> +config PALMAS_GPADC
> +	tristate "TI Palmas General Purpose ADC"
> +	depends on MFD_PALMAS
> +	help
> +	  Palmas series pmic chip by Texas Instruments (twl6035/6037)
> +	  is used in smartphones and tablets and supports a 16 channel
> +	  general purpose ADC.
> +
>  config QCOM_SPMI_IADC
>  	tristate "Qualcomm SPMI PMIC current ADC"
>  	depends on SPMI
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index a096210..716f112 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -26,6 +26,7 @@ obj-$(CONFIG_MCP320X) += mcp320x.o
>  obj-$(CONFIG_MCP3422) += mcp3422.o
>  obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o
>  obj-$(CONFIG_NAU7802) += nau7802.o
> +obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
>  obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o
>  obj-$(CONFIG_QCOM_SPMI_VADC) += qcom-spmi-vadc.o
>  obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o
> diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
> new file mode 100644
> index 0000000..71763c5
> --- /dev/null
> +++ b/drivers/iio/adc/palmas_gpadc.c
> @@ -0,0 +1,817 @@
> +/*
> + * palmas-adc.c -- TI PALMAS GPADC.
> + *
> + * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
> + *
> + * Author: Pradeep Goudagunta <pgoudagunta@nvidia.com>
> + *
> + * 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.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/err.h>
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/delay.h>
> +#include <linux/i2c.h>
> +#include <linux/pm.h>
> +#include <linux/mfd/palmas.h>
> +#include <linux/completion.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/machine.h>
> +#include <linux/iio/driver.h>
> +
> +#define MOD_NAME "palmas-gpadc"
> +#define PALMAS_ADC_CONVERSION_TIMEOUT	(msecs_to_jiffies(5000))
> +#define PALMAS_TO_BE_CALCULATED 0
> +#define PALMAS_GPADC_TRIMINVALID	-1
> +
> +struct palmas_gpadc_info {
> +/* calibration codes and regs */
> +	int x1;	/* lower ideal code */
> +	int x2;	/* higher ideal code */
> +	int v1;	/* expected lower volt reading */
> +	int v2;	/* expected higher volt reading */
> +	u8 trim1_reg;	/* register number for lower trim */
> +	u8 trim2_reg;	/* register number for upper trim */
> +	int gain;	/* calculated from above (after reading trim regs) */
> +	int offset;	/* calculated from above (after reading trim regs) */
> +	int gain_error;	/* calculated from above (after reading trim regs) */
> +	bool is_uncalibrated;	/* if channel has calibration data */
> +};
> +
> +#define PALMAS_ADC_INFO(_chan, _x1, _x2, _v1, _v2, _t1, _t2, _is_uncalibrated) \
> +	[PALMAS_ADC_CH_##_chan] = { \
> +		.x1 = _x1, \
> +		.x2 = _x2, \
> +		.v1 = _v1, \
> +		.v2 = _v2, \
> +		.gain = PALMAS_TO_BE_CALCULATED, \
> +		.offset = PALMAS_TO_BE_CALCULATED, \
> +		.gain_error = PALMAS_TO_BE_CALCULATED, \
> +		.trim1_reg = PALMAS_GPADC_TRIM##_t1, \
> +		.trim2_reg = PALMAS_GPADC_TRIM##_t2,  \
> +		.is_uncalibrated = _is_uncalibrated \
> +	}
> +
> +static struct palmas_gpadc_info palmas_gpadc_info[] = {
> +	PALMAS_ADC_INFO(IN0, 2064, 3112, 630, 950, 1, 2, false),
> +	PALMAS_ADC_INFO(IN1, 2064, 3112, 630, 950, 1, 2, false),
> +	PALMAS_ADC_INFO(IN2, 2064, 3112, 1260, 1900, 3, 4, false),
> +	PALMAS_ADC_INFO(IN3, 2064, 3112, 630, 950, 1, 2, false),
> +	PALMAS_ADC_INFO(IN4, 2064, 3112, 630, 950, 1, 2, false),
> +	PALMAS_ADC_INFO(IN5, 2064, 3112, 630, 950, 1, 2, false),
> +	PALMAS_ADC_INFO(IN6, 2064, 3112, 2520, 3800, 5, 6, false),
> +	PALMAS_ADC_INFO(IN7, 2064, 3112, 2520, 3800, 7, 8, false),
> +	PALMAS_ADC_INFO(IN8, 2064, 3112, 3150, 4750, 9, 10, false),
> +	PALMAS_ADC_INFO(IN9, 2064, 3112, 5670, 8550, 11, 12, false),
> +	PALMAS_ADC_INFO(IN10, 2064, 3112, 3465, 5225, 13, 14, false),
> +	PALMAS_ADC_INFO(IN11, 0, 0, 0, 0, INVALID, INVALID, true),
> +	PALMAS_ADC_INFO(IN12, 0, 0, 0, 0, INVALID, INVALID, true),
> +	PALMAS_ADC_INFO(IN13, 0, 0, 0, 0, INVALID, INVALID, true),
> +	PALMAS_ADC_INFO(IN14, 2064, 3112, 3645, 5225, 15, 16, false),
> +	PALMAS_ADC_INFO(IN15, 0, 0, 0, 0, INVALID, INVALID, true),
> +};
> +
> +/**
> + * struct palmas_gpadc - the palmas_gpadc structure
> + * @ch0_current:	channel 0 current source setting
> + *			0: 0 uA
> + *			1: 5 uA
> + *			2: 15 uA
> + *			3: 20 uA
> + * @ch3_current:	channel 0 current source setting
> + *			0: 0 uA
> + *			1: 10 uA
> + *			2: 400 uA
> + *			3: 800 uA
> + * @extended_delay:	enable the gpadc extended delay mode
> + * @auto_conversion_period:	define the auto_conversion_period
> + *
> + * This is the palmas_gpadc structure to store run-time information
> + * and pointers for this driver instance.
> + */
> +
> +struct palmas_gpadc {
> +	struct device			*dev;
> +	struct palmas			*palmas;
> +	u8				ch0_current;
> +	u8				ch3_current;
> +	bool				extended_delay;
> +	int				irq;
> +	int				irq_auto_0;
> +	int				irq_auto_1;
> +	struct palmas_gpadc_info	*adc_info;
> +	struct completion		conv_completion;
> +	struct palmas_adc_wakeup_property wakeup1_data;
> +	struct palmas_adc_wakeup_property wakeup2_data;
> +	bool				wakeup1_enable;
> +	bool				wakeup2_enable;
> +	int				auto_conversion_period;
> +};
> +
> +/*
> + * GPADC lock issue in AUTO mode.
> + * Impact: In AUTO mode, GPADC conversion can be locked after disabling AUTO
> + *	   mode feature.
> + * Details:
> + *	When the AUTO mode is the only conversion mode enabled, if the AUTO
> + *	mode feature is disabled with bit GPADC_AUTO_CTRL.  AUTO_CONV1_EN = 0
> + *	or bit GPADC_AUTO_CTRL.  AUTO_CONV0_EN = 0 during a conversion, the
> + *	conversion mechanism can be seen as locked meaning that all following
> + *	conversion will give 0 as a result.  Bit GPADC_STATUS.GPADC_AVAILABLE
> + *	will stay at 0 meaning that GPADC is busy.  An RT conversion can unlock
> + *	the GPADC.
> + *
> + * Workaround(s):
> + *	To avoid the lock mechanism, the workaround to follow before any stop
> + *	conversion request is:
> + *	Force the GPADC state machine to be ON by using the GPADC_CTRL1.
> + *		GPADC_FORCE bit = 1
> + *	Shutdown the GPADC AUTO conversion using
> + *		GPADC_AUTO_CTRL.SHUTDOWN_CONV[01] = 0.
> + *	After 100us, force the GPADC state machine to be OFF by using the
> + *		GPADC_CTRL1.  GPADC_FORCE bit = 0
> + */
> +
> +static int palmas_disable_auto_conversion(struct palmas_gpadc *adc)
> +{
> +	int ret;
> +
> +	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
> +			PALMAS_GPADC_CTRL1,
> +			PALMAS_GPADC_CTRL1_GPADC_FORCE,
> +			PALMAS_GPADC_CTRL1_GPADC_FORCE);
> +	if (ret < 0) {
> +		dev_err(adc->dev, "GPADC_CTRL1 update failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
> +			PALMAS_GPADC_AUTO_CTRL,
> +			PALMAS_GPADC_AUTO_CTRL_SHUTDOWN_CONV1 |
> +			PALMAS_GPADC_AUTO_CTRL_SHUTDOWN_CONV0,
> +			0);
> +	if (ret < 0) {
> +		dev_err(adc->dev, "AUTO_CTRL update failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	udelay(100);
> +
> +	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
> +			PALMAS_GPADC_CTRL1,
> +			PALMAS_GPADC_CTRL1_GPADC_FORCE, 0);
> +	if (ret < 0)
> +		dev_err(adc->dev, "GPADC_CTRL1 update failed: %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static irqreturn_t palmas_gpadc_irq(int irq, void *data)
> +{
> +	struct palmas_gpadc *adc = data;
> +
> +	complete(&adc->conv_completion);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t palmas_gpadc_irq_auto(int irq, void *data)
> +{
> +	struct palmas_gpadc *adc = data;
> +
> +	dev_dbg(adc->dev, "Threshold interrupt %d occurs\n", irq);
> +	palmas_disable_auto_conversion(adc);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int palmas_gpadc_start_mask_interrupt(struct palmas_gpadc *adc,
> +						bool mask)
> +{
> +	int ret;
> +
> +	if (!mask)
> +		ret = palmas_update_bits(adc->palmas, PALMAS_INTERRUPT_BASE,
> +					PALMAS_INT3_MASK,
> +					PALMAS_INT3_MASK_GPADC_EOC_SW, 0);
> +	else
> +		ret = palmas_update_bits(adc->palmas, PALMAS_INTERRUPT_BASE,
> +					PALMAS_INT3_MASK,
> +					PALMAS_INT3_MASK_GPADC_EOC_SW,
> +					PALMAS_INT3_MASK_GPADC_EOC_SW);
> +	if (ret < 0)
> +		dev_err(adc->dev, "GPADC INT MASK update failed: %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static int palmas_gpadc_enable(struct palmas_gpadc *adc, int adc_chan,
> +			       int enable)
> +{
> +	unsigned int mask, val;
> +	int ret;
> +
> +	if (enable) {
> +		val = (adc->extended_delay
> +			<< PALMAS_GPADC_RT_CTRL_EXTEND_DELAY_SHIFT);
> +		ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
> +					PALMAS_GPADC_RT_CTRL,
> +					PALMAS_GPADC_RT_CTRL_EXTEND_DELAY, val);
> +		if (ret < 0) {
> +			dev_err(adc->dev, "RT_CTRL update failed: %d\n", ret);
> +			return ret;
> +		}
> +
> +		mask = (PALMAS_GPADC_CTRL1_CURRENT_SRC_CH0_MASK |
> +			PALMAS_GPADC_CTRL1_CURRENT_SRC_CH3_MASK |
> +			PALMAS_GPADC_CTRL1_GPADC_FORCE);
> +		val = (adc->ch0_current
> +			<< PALMAS_GPADC_CTRL1_CURRENT_SRC_CH0_SHIFT);
> +		val |= (adc->ch3_current
> +			<< PALMAS_GPADC_CTRL1_CURRENT_SRC_CH3_SHIFT);
> +		val |= PALMAS_GPADC_CTRL1_GPADC_FORCE;
> +		ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
> +				PALMAS_GPADC_CTRL1, mask, val);
> +		if (ret < 0) {
> +			dev_err(adc->dev,
> +				"Failed to update current setting: %d\n", ret);
> +			return ret;
> +		}
> +
> +		mask = (PALMAS_GPADC_SW_SELECT_SW_CONV0_SEL_MASK |
> +			PALMAS_GPADC_SW_SELECT_SW_CONV_EN);
> +		val = (adc_chan | PALMAS_GPADC_SW_SELECT_SW_CONV_EN);
> +		ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
> +				PALMAS_GPADC_SW_SELECT, mask, val);
> +		if (ret < 0) {
> +			dev_err(adc->dev, "SW_SELECT update failed: %d\n", ret);
> +			return ret;
> +		}
> +	} else {
> +		ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
> +				PALMAS_GPADC_SW_SELECT, 0);
> +		if (ret < 0)
> +			dev_err(adc->dev, "SW_SELECT write failed: %d\n", ret);
> +
> +		ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
> +				PALMAS_GPADC_CTRL1,
> +				PALMAS_GPADC_CTRL1_GPADC_FORCE, 0);
> +		if (ret < 0) {
> +			dev_err(adc->dev, "CTRL1 update failed: %d\n", ret);
> +			return ret;
> +		}
> +	}
> +
> +	return ret;
> +}
> +
> +static int palmas_gpadc_read_prepare(struct palmas_gpadc *adc, int adc_chan)
> +{
> +	int ret;
> +
> +	ret = palmas_gpadc_enable(adc, adc_chan, true);
> +	if (ret < 0)
> +		return ret;
> +
> +	return palmas_gpadc_start_mask_interrupt(adc, 0);
> +}
> +
> +static void palmas_gpadc_read_done(struct palmas_gpadc *adc, int adc_chan)
> +{
> +	palmas_gpadc_start_mask_interrupt(adc, 1);
> +	palmas_gpadc_enable(adc, adc_chan, false);
> +}
> +
> +static int palmas_gpadc_calibrate(struct palmas_gpadc *adc, int adc_chan)
> +{
> +	int k;
> +	int d1;
> +	int d2;
> +	int ret;
> +	int gain;
> +	int x1 =  adc->adc_info[adc_chan].x1;
> +	int x2 =  adc->adc_info[adc_chan].x2;
> +	int v1 = adc->adc_info[adc_chan].v1;
> +	int v2 = adc->adc_info[adc_chan].v2;
> +
> +	ret = palmas_read(adc->palmas, PALMAS_TRIM_GPADC_BASE,
> +				adc->adc_info[adc_chan].trim1_reg, &d1);
> +	if (ret < 0) {
> +		dev_err(adc->dev, "TRIM read failed: %d\n", ret);
> +		goto scrub;
> +	}
> +
> +	ret = palmas_read(adc->palmas, PALMAS_TRIM_GPADC_BASE,
> +				adc->adc_info[adc_chan].trim2_reg, &d2);
> +	if (ret < 0) {
> +		dev_err(adc->dev, "TRIM read failed: %d\n", ret);
> +		goto scrub;
> +	}
> +
> +	/* gain error calculation */
> +	k = (1000 + (1000 * (d2 - d1)) / (x2 - x1));
> +
> +	/* gain calculation */
> +	gain = ((v2 - v1) * 1000) / (x2 - x1);
> +
> +	adc->adc_info[adc_chan].gain_error = k;
> +	adc->adc_info[adc_chan].gain = gain;
> +	/* offset Calculation */
> +	adc->adc_info[adc_chan].offset = (d1 * 1000) - ((k - 1000) * x1);
> +
> +scrub:
> +	return ret;
> +}
> +
> +static int palmas_gpadc_start_conversion(struct palmas_gpadc *adc, int adc_chan)
> +{
> +	unsigned int val;
> +	int ret;
> +
> +	init_completion(&adc->conv_completion);
> +	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
> +				PALMAS_GPADC_SW_SELECT,
> +				PALMAS_GPADC_SW_SELECT_SW_START_CONV0,
> +				PALMAS_GPADC_SW_SELECT_SW_START_CONV0);
> +	if (ret < 0) {
> +		dev_err(adc->dev, "SELECT_SW_START write failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = wait_for_completion_timeout(&adc->conv_completion,
> +				PALMAS_ADC_CONVERSION_TIMEOUT);
> +	if (ret == 0) {
> +		dev_err(adc->dev, "conversion not completed\n");
> +		return -ETIMEDOUT;
> +	}
> +
> +	ret = palmas_bulk_read(adc->palmas, PALMAS_GPADC_BASE,
> +				PALMAS_GPADC_SW_CONV0_LSB, &val, 2);
> +	if (ret < 0) {
> +		dev_err(adc->dev, "SW_CONV0_LSB read failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = val & 0xFFF;
> +
> +	return ret;
> +}
> +
> +static int palmas_gpadc_get_calibrated_code(struct palmas_gpadc *adc,
> +						int adc_chan, int val)
> +{
> +	if (!adc->adc_info[adc_chan].is_uncalibrated)
> +		val  = (val*1000 - adc->adc_info[adc_chan].offset) /
> +					adc->adc_info[adc_chan].gain_error;
> +
> +	if (val < 0) {
> +		dev_err(adc->dev, "Mismatch with calibration\n");
> +		return 0;
> +	}
> +
> +	val = (val * adc->adc_info[adc_chan].gain) / 1000;
> +
> +	return val;
> +}
> +
> +static int palmas_gpadc_read_raw(struct iio_dev *indio_dev,
> +	struct iio_chan_spec const *chan, int *val, int *val2, long mask)
> +{
> +	struct  palmas_gpadc *adc = iio_priv(indio_dev);
> +	int adc_chan = chan->channel;
> +	int ret = 0;
> +
> +	if (adc_chan > PALMAS_ADC_CH_MAX)
> +		return -EINVAL;
> +
> +	mutex_lock(&indio_dev->mlock);
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_RAW:
> +	case IIO_CHAN_INFO_PROCESSED:
> +		ret = palmas_gpadc_read_prepare(adc, adc_chan);
> +		if (ret < 0)
> +			goto out;
> +
> +		ret = palmas_gpadc_start_conversion(adc, adc_chan);
> +		if (ret < 0) {
> +			dev_err(adc->dev,
> +			"ADC start conversion failed\n");
> +			goto out;
> +		}
> +
> +		if (mask == IIO_CHAN_INFO_PROCESSED)
> +			ret = palmas_gpadc_get_calibrated_code(
> +							adc, adc_chan, ret);
> +
> +		*val = ret;
> +
> +		ret = IIO_VAL_INT;
> +		goto out;
> +	}
> +
> +	mutex_unlock(&indio_dev->mlock);
> +	return ret;
> +
> +out:
> +	palmas_gpadc_read_done(adc, adc_chan);
> +	mutex_unlock(&indio_dev->mlock);
> +
> +	return ret;
> +}
> +
> +static const struct iio_info palmas_gpadc_iio_info = {
> +	.read_raw = palmas_gpadc_read_raw,
> +	.driver_module = THIS_MODULE,
> +};
> +
> +#define PALMAS_ADC_CHAN_IIO(chan, _type, chan_info)	\
> +{							\
> +	.datasheet_name = PALMAS_DATASHEET_NAME(chan),	\
> +	.type = _type,					\
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	\
> +			BIT(chan_info),			\
> +	.indexed = 1,					\
> +	.channel = PALMAS_ADC_CH_##chan,		\
> +}
> +
> +static const struct iio_chan_spec palmas_gpadc_iio_channel[] = {
> +	PALMAS_ADC_CHAN_IIO(IN0, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
> +	PALMAS_ADC_CHAN_IIO(IN1, IIO_TEMP, IIO_CHAN_INFO_RAW),
> +	PALMAS_ADC_CHAN_IIO(IN2, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
> +	PALMAS_ADC_CHAN_IIO(IN3, IIO_TEMP, IIO_CHAN_INFO_RAW),
> +	PALMAS_ADC_CHAN_IIO(IN4, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
> +	PALMAS_ADC_CHAN_IIO(IN5, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
> +	PALMAS_ADC_CHAN_IIO(IN6, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
> +	PALMAS_ADC_CHAN_IIO(IN7, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
> +	PALMAS_ADC_CHAN_IIO(IN8, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
> +	PALMAS_ADC_CHAN_IIO(IN9, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
> +	PALMAS_ADC_CHAN_IIO(IN10, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
> +	PALMAS_ADC_CHAN_IIO(IN11, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
> +	PALMAS_ADC_CHAN_IIO(IN12, IIO_TEMP, IIO_CHAN_INFO_RAW),
> +	PALMAS_ADC_CHAN_IIO(IN13, IIO_TEMP, IIO_CHAN_INFO_RAW),
> +	PALMAS_ADC_CHAN_IIO(IN14, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
> +	PALMAS_ADC_CHAN_IIO(IN15, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
> +};
> +
> +static int palmas_gpadc_probe(struct platform_device *pdev)
> +{
> +	struct palmas_gpadc *adc;
> +	struct palmas_platform_data *pdata;
> +	struct palmas_gpadc_platform_data *gpadc_pdata = NULL;
> +	struct iio_dev *indio_dev;
> +	int ret, i;
> +
> +	pdata = dev_get_platdata(pdev->dev.parent);
> +	if (!pdata || !pdata->gpadc_pdata) {
> +		dev_err(&pdev->dev, "No platform data\n");
> +		return -ENODEV;
> +	}
> +
> +	gpadc_pdata = pdata->gpadc_pdata;
> +
> +	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc));
> +	if (!indio_dev) {
> +		dev_err(&pdev->dev, "iio_device_alloc failed\n");
> +		return -ENOMEM;
> +	}
> +
> +	adc = iio_priv(indio_dev);
> +	adc->dev = &pdev->dev;
> +	adc->palmas = dev_get_drvdata(pdev->dev.parent);
> +	adc->adc_info = palmas_gpadc_info;
> +	init_completion(&adc->conv_completion);
> +	dev_set_drvdata(&pdev->dev, indio_dev);
> +
> +	adc->auto_conversion_period = gpadc_pdata->auto_conversion_period_ms;
> +	adc->irq = palmas_irq_get_virq(adc->palmas, PALMAS_GPADC_EOC_SW_IRQ);
> +	if (adc->irq < 0) {
> +		dev_err(adc->dev,
> +			"get virq failed: %d\n", adc->irq);
> +		ret = adc->irq;
> +		goto out;
> +	}
> +	ret = request_threaded_irq(adc->irq, NULL,
> +		palmas_gpadc_irq,
> +		IRQF_ONESHOT | IRQF_EARLY_RESUME, dev_name(adc->dev),
> +		adc);
> +	if (ret < 0) {
> +		dev_err(adc->dev,
> +			"request irq %d failed: %d\n", adc->irq, ret);
> +		goto out;
> +	}
> +
> +	if (gpadc_pdata->adc_wakeup1_data) {
> +		memcpy(&adc->wakeup1_data, gpadc_pdata->adc_wakeup1_data,
> +			sizeof(adc->wakeup1_data));
> +		adc->wakeup1_enable = true;
> +		adc->irq_auto_0 =  platform_get_irq(pdev, 1);
> +		ret = request_threaded_irq(adc->irq_auto_0, NULL,
> +				palmas_gpadc_irq_auto,
> +				IRQF_ONESHOT | IRQF_EARLY_RESUME,
> +				"palmas-adc-auto-0", adc);
> +		if (ret < 0) {
> +			dev_err(adc->dev, "request auto0 irq %d failed: %d\n",
> +				adc->irq_auto_0, ret);
> +			goto out_irq_free;
> +		}
> +	}
> +
> +	if (gpadc_pdata->adc_wakeup2_data) {
> +		memcpy(&adc->wakeup2_data, gpadc_pdata->adc_wakeup2_data,
> +				sizeof(adc->wakeup2_data));
> +		adc->wakeup2_enable = true;
> +		adc->irq_auto_1 =  platform_get_irq(pdev, 2);
> +		ret = request_threaded_irq(adc->irq_auto_1, NULL,
> +				palmas_gpadc_irq_auto,
> +				IRQF_ONESHOT | IRQF_EARLY_RESUME,
> +				"palmas-adc-auto-1", adc);
> +		if (ret < 0) {
> +			dev_err(adc->dev, "request auto1 irq %d failed: %d\n",
> +				adc->irq_auto_1, ret);
> +			goto out_irq_auto0_free;
> +		}
> +	}
> +
> +	/* set the current source 0 (value 0/5/15/20 uA => 0..3) */
> +	if (gpadc_pdata->ch0_current <= 1)
> +		adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_0;
> +	else if (gpadc_pdata->ch0_current <= 5)
> +		adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_5;
> +	else if (gpadc_pdata->ch0_current <= 15)
> +		adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_15;
> +	else
> +		adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_20;
> +
> +	/* set the current source 3 (value 0/10/400/800 uA => 0..3) */
> +	if (gpadc_pdata->ch3_current <= 1)
> +		adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_0;
> +	else if (gpadc_pdata->ch3_current <= 10)
> +		adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_10;
> +	else if (gpadc_pdata->ch3_current <= 400)
> +		adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_400;
> +	else
> +		adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_800;
> +
> +	adc->extended_delay = gpadc_pdata->extended_delay;
> +
> +	indio_dev->name = MOD_NAME;
> +	indio_dev->dev.parent = &pdev->dev;
> +	indio_dev->info = &palmas_gpadc_iio_info;
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +	indio_dev->channels = palmas_gpadc_iio_channel;
> +	indio_dev->num_channels = ARRAY_SIZE(palmas_gpadc_iio_channel);
> +
> +	ret = iio_device_register(indio_dev);
> +	if (ret < 0) {
> +		dev_err(adc->dev, "iio_device_register() failed: %d\n", ret);
> +		goto out_irq_auto1_free;
> +	}
> +
> +	device_set_wakeup_capable(&pdev->dev, 1);
> +	for (i = 0; i < PALMAS_ADC_CH_MAX; i++) {
> +		if (!(adc->adc_info[i].is_uncalibrated))
> +			palmas_gpadc_calibrate(adc, i);
> +	}
> +
> +	if (adc->wakeup1_enable || adc->wakeup2_enable)
> +		device_wakeup_enable(&pdev->dev);
> +
> +	return 0;
> +
> +out_irq_auto1_free:
> +	if (gpadc_pdata->adc_wakeup2_data)
> +		free_irq(adc->irq_auto_1, adc);
> +out_irq_auto0_free:
> +	if (gpadc_pdata->adc_wakeup1_data)
> +		free_irq(adc->irq_auto_0, adc);
> +out_irq_free:
> +	free_irq(adc->irq, adc);
> +out:
> +	return ret;
> +}
> +
> +static int palmas_gpadc_remove(struct platform_device *pdev)
> +{
> +	struct iio_dev *indio_dev = dev_to_iio_dev(&pdev->dev);
> +	struct palmas_gpadc *adc = iio_priv(indio_dev);
> +
> +	if (adc->wakeup1_enable || adc->wakeup2_enable)
> +		device_wakeup_disable(&pdev->dev);
> +	iio_device_unregister(indio_dev);
> +	free_irq(adc->irq, adc);
> +	if (adc->wakeup1_enable)
> +		free_irq(adc->irq_auto_0, adc);
> +	if (adc->wakeup2_enable)
> +		free_irq(adc->irq_auto_1, adc);
> +
> +	return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int palmas_adc_wakeup_configure(struct palmas_gpadc *adc)
> +{
> +	int adc_period, conv;
> +	int i;
> +	int ch0 = 0, ch1 = 0;
> +	int thres;
> +	int ret;
> +
> +	adc_period = adc->auto_conversion_period;
> +	for (i = 0; i < 16; ++i) {
> +		if (((1000 * (1 << i)) / 32) < adc_period)
> +			continue;
> +	}
> +	if (i > 0)
> +		i--;
> +	adc_period = i;
> +	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
> +			PALMAS_GPADC_AUTO_CTRL,
> +			PALMAS_GPADC_AUTO_CTRL_COUNTER_CONV_MASK,
> +			adc_period);
> +	if (ret < 0) {
> +		dev_err(adc->dev, "AUTO_CTRL write failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	conv = 0;
> +	if (adc->wakeup1_enable) {
> +		int polarity;
> +
> +		ch0 = adc->wakeup1_data.adc_channel_number;
> +		conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV0_EN;
> +		if (adc->wakeup1_data.adc_high_threshold > 0) {
> +			thres = adc->wakeup1_data.adc_high_threshold;
> +			polarity = 0;
> +		} else {
> +			thres = adc->wakeup1_data.adc_low_threshold;
> +			polarity = PALMAS_GPADC_THRES_CONV0_MSB_THRES_CONV0_POL;
> +		}
> +
> +		ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
> +				PALMAS_GPADC_THRES_CONV0_LSB, thres & 0xFF);
> +		if (ret < 0) {
> +			dev_err(adc->dev,
> +				"THRES_CONV0_LSB write failed: %d\n", ret);
> +			return ret;
> +		}
> +
> +		ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
> +				PALMAS_GPADC_THRES_CONV0_MSB,
> +				((thres >> 8) & 0xF) | polarity);
> +		if (ret < 0) {
> +			dev_err(adc->dev,
> +				"THRES_CONV0_MSB write failed: %d\n", ret);
> +			return ret;
> +		}
> +	}
> +
> +	if (adc->wakeup2_enable) {
> +		int polarity;
> +
> +		ch1 = adc->wakeup2_data.adc_channel_number;
> +		conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV1_EN;
> +		if (adc->wakeup2_data.adc_high_threshold > 0) {
> +			thres = adc->wakeup2_data.adc_high_threshold;
> +			polarity = 0;
> +		} else {
> +			thres = adc->wakeup2_data.adc_low_threshold;
> +			polarity = PALMAS_GPADC_THRES_CONV1_MSB_THRES_CONV1_POL;
> +		}
> +
> +		ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
> +				PALMAS_GPADC_THRES_CONV1_LSB, thres & 0xFF);
> +		if (ret < 0) {
> +			dev_err(adc->dev,
> +				"THRES_CONV1_LSB write failed: %d\n", ret);
> +			return ret;
> +		}
> +
> +		ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
> +				PALMAS_GPADC_THRES_CONV1_MSB,
> +				((thres >> 8) & 0xF) | polarity);
> +		if (ret < 0) {
> +			dev_err(adc->dev,
> +				"THRES_CONV1_MSB write failed: %d\n", ret);
> +			return ret;
> +		}
> +	}
> +
> +	ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
> +			PALMAS_GPADC_AUTO_SELECT, (ch1 << 4) | ch0);
> +	if (ret < 0) {
> +		dev_err(adc->dev, "AUTO_SELECT write failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
> +			PALMAS_GPADC_AUTO_CTRL,
> +			PALMAS_GPADC_AUTO_CTRL_AUTO_CONV1_EN |
> +			PALMAS_GPADC_AUTO_CTRL_AUTO_CONV0_EN, conv);
> +	if (ret < 0)
> +		dev_err(adc->dev, "AUTO_CTRL write failed: %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static int palmas_adc_wakeup_reset(struct palmas_gpadc *adc)
> +{
> +	int ret;
> +
> +	ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
> +			PALMAS_GPADC_AUTO_SELECT, 0);
> +	if (ret < 0) {
> +		dev_err(adc->dev, "AUTO_SELECT write failed: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = palmas_disable_auto_conversion(adc);
> +	if (ret < 0)
> +		dev_err(adc->dev, "Disable auto conversion failed: %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static int palmas_gpadc_suspend(struct device *dev)
> +{
> +	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> +	struct palmas_gpadc *adc = iio_priv(indio_dev);
> +	int wakeup = adc->wakeup1_enable || adc->wakeup2_enable;
> +	int ret;
> +
> +	if (!device_may_wakeup(dev) || !wakeup)
> +		return 0;
> +
> +	ret = palmas_adc_wakeup_configure(adc);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (adc->wakeup1_enable)
> +		enable_irq_wake(adc->irq_auto_0);
> +
> +	if (adc->wakeup2_enable)
> +		enable_irq_wake(adc->irq_auto_1);
> +
> +	return 0;
> +}
> +
> +static int palmas_gpadc_resume(struct device *dev)
> +{
> +	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> +	struct palmas_gpadc *adc = iio_priv(indio_dev);
> +	int wakeup = adc->wakeup1_enable || adc->wakeup2_enable;
> +	int ret;
> +
> +	if (!device_may_wakeup(dev) || !wakeup)
> +		return 0;
> +
> +	ret = palmas_adc_wakeup_reset(adc);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (adc->wakeup1_enable)
> +		disable_irq_wake(adc->irq_auto_0);
> +
> +	if (adc->wakeup2_enable)
> +		disable_irq_wake(adc->irq_auto_1);
> +
> +	return 0;
> +};
> +#endif
> +
> +static const struct dev_pm_ops palmas_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(palmas_gpadc_suspend,
> +				palmas_gpadc_resume)
> +};
> +
> +static struct platform_driver palmas_gpadc_driver = {
> +	.probe = palmas_gpadc_probe,
> +	.remove = palmas_gpadc_remove,
> +	.driver = {
> +		.name = MOD_NAME,
> +		.pm = &palmas_pm_ops,
> +	},
> +};
> +
> +static int __init palmas_gpadc_init(void)
> +{
> +	return platform_driver_register(&palmas_gpadc_driver);
> +}
> +module_init(palmas_gpadc_init);
> +
> +static void __exit palmas_gpadc_exit(void)
> +{
> +	platform_driver_unregister(&palmas_gpadc_driver);
> +}
> +module_exit(palmas_gpadc_exit);
> +
> +MODULE_DESCRIPTION("palmas GPADC driver");
> +MODULE_AUTHOR("Pradeep Goudagunta<pgoudagunta@nvidia.com>");
> +MODULE_ALIAS("platform:palmas-gpadc");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h
> index 13e1d96..c800dbc 100644
> --- a/include/linux/mfd/palmas.h
> +++ b/include/linux/mfd/palmas.h
> @@ -134,21 +134,32 @@ struct palmas_pmic_driver_data {
>  			    struct regulator_config config);
>  };
>  
> +struct palmas_adc_wakeup_property {
> +	int adc_channel_number;
> +	int adc_high_threshold;
> +	int adc_low_threshold;
> +};
> +
>  struct palmas_gpadc_platform_data {
>  	/* Channel 3 current source is only enabled during conversion */
> -	int ch3_current;
> +	int ch3_current;	/* 0: off; 1: 10uA; 2: 400uA; 3: 800 uA */
>  
>  	/* Channel 0 current source can be used for battery detection.
>  	 * If used for battery detection this will cause a permanent current
>  	 * consumption depending on current level set here.
>  	 */
> -	int ch0_current;
> +	int ch0_current;	/* 0: off; 1: 5uA; 2: 15uA; 3: 20 uA */
> +	bool extended_delay;	/* use extended delay for conversion */
>  
>  	/* default BAT_REMOVAL_DAT setting on device probe */
>  	int bat_removal;
>  
>  	/* Sets the START_POLARITY bit in the RT_CTRL register */
>  	int start_polarity;
> +
> +	int auto_conversion_period_ms;
> +	struct palmas_adc_wakeup_property *adc_wakeup1_data;
> +	struct palmas_adc_wakeup_property *adc_wakeup2_data;
>  };
>  
>  struct palmas_reg_init {
> @@ -405,28 +416,7 @@ struct palmas_gpadc_calibration {
>  	s32 offset_error;
>  };
>  
> -struct palmas_gpadc {
> -	struct device *dev;
> -	struct palmas *palmas;
> -
> -	int ch3_current;
> -	int ch0_current;
> -
> -	int gpadc_force;
> -
> -	int bat_removal;
> -
> -	struct mutex reading_lock;
> -	struct completion irq_complete;
> -
> -	int eoc_sw_irq;
> -
> -	struct palmas_gpadc_calibration *palmas_cal_tbl;
> -
> -	int conv0_channel;
> -	int conv1_channel;
> -	int rt_channel;
> -};
> +#define PALMAS_DATASHEET_NAME(_name)	"palmas-gpadc-chan-"#_name
>  
>  struct palmas_gpadc_result {
>  	s32 raw_code;
> @@ -520,6 +510,43 @@ enum palmas_irqs {
>  	PALMAS_NUM_IRQ,
>  };
>  
> +/* Palmas GPADC Channels */
> +enum {
> +	PALMAS_ADC_CH_IN0,
> +	PALMAS_ADC_CH_IN1,
> +	PALMAS_ADC_CH_IN2,
> +	PALMAS_ADC_CH_IN3,
> +	PALMAS_ADC_CH_IN4,
> +	PALMAS_ADC_CH_IN5,
> +	PALMAS_ADC_CH_IN6,
> +	PALMAS_ADC_CH_IN7,
> +	PALMAS_ADC_CH_IN8,
> +	PALMAS_ADC_CH_IN9,
> +	PALMAS_ADC_CH_IN10,
> +	PALMAS_ADC_CH_IN11,
> +	PALMAS_ADC_CH_IN12,
> +	PALMAS_ADC_CH_IN13,
> +	PALMAS_ADC_CH_IN14,
> +	PALMAS_ADC_CH_IN15,
> +	PALMAS_ADC_CH_MAX,
> +};
> +
> +/* Palmas GPADC Channel0 Current Source */
> +enum {
> +	PALMAS_ADC_CH0_CURRENT_SRC_0,
> +	PALMAS_ADC_CH0_CURRENT_SRC_5,
> +	PALMAS_ADC_CH0_CURRENT_SRC_15,
> +	PALMAS_ADC_CH0_CURRENT_SRC_20,
> +};
> +
> +/* Palmas GPADC Channel3 Current Source */
> +enum {
> +	PALMAS_ADC_CH3_CURRENT_SRC_0,
> +	PALMAS_ADC_CH3_CURRENT_SRC_10,
> +	PALMAS_ADC_CH3_CURRENT_SRC_400,
> +	PALMAS_ADC_CH3_CURRENT_SRC_800,
> +};
> +
>  struct palmas_pmic {
>  	struct palmas *palmas;
>  	struct device *dev;
> 

Re: [PATCH v3 2/3] iio:adc:palmas: add DT support

[Jonathan Cameron]

On 16/10/15 13:53, H. Nikolaus Schaller wrote:
> From: Marek Belisko <marek@goldelico.com>
> 
> Code was found at:
> https://android.googlesource.com/kernel/tegra/+/a90856a6626d502d42c6e7abccbdf9d730b36270%5E%21/#F1
> 
> Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
> Signed-off-by: Marek Belisko <marek@goldelico.com> [Fixed minor typos + add channels list to documentation]
I am happy with your responses to Lars and that kind of covers what Mark raised as well.

One typo correction applied.

Applied to the togreg branch of iio.git

Thanks,

Jonathan
> ---
>  .../devicetree/bindings/iio/adc/palmas-gpadc.txt   | 48 ++++++++++++++++++++
>  drivers/iio/adc/palmas_gpadc.c                     | 52 +++++++++++++++++++---
>  2 files changed, 95 insertions(+), 5 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt b/Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt
> new file mode 100644
> index 0000000..a6de996
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/palmas-gpadc.txt
> @@ -0,0 +1,48 @@
> +* Palmas general purpose ADC IP block devicetree bindings
> +
> +Channels list:
> +	0 battery type
> +	1 battery temp NTC (optional current source)
> +	2 GP
> +	3 temp (with ext. diode, optional current source)
> +	4 GP
> +	5 GP
> +	6 VBAT_SENSE
> +	7 VCC_SENSE
> +	8 Backup Battery voltage
> +	9 external charger (VCHG)
> +	10 VBUS
> +	11 DC-DC current probe (how does this work?)
> +	12 internal die temp
> +	13 internal die temp
> +	14 USB ID pin voltage
> +	15 test network
> +
> +Required properties:
> +- compatible : Must be "ti,palmas-gpadc".
> +- #io-channel-cells: Should be set to <1>.
> +
> +Optional sub-nodes:
> +ti,channel0-current-microamp: Channel 0 current in uA.
> +	Values are rounded to derive 0uA, 5uA, 15uA, 20uA.
> +ti,channel3-current-microamp: Channel 3 current in uA.
> +	Valid are rounded to derive 0uA, 10uA, 400uA, 800uA.
Values

> +ti,enable-extended-delay: Enable extended delay.
> +
> +Example:
> +
> +pmic {
> +	compatible = "ti,twl6035-pmic", "ti,palmas-pmic";
> +	...
> +	gpadc {
> +		compatible = "ti,palmas-gpadc";
> +		interrupts = <18 0
> +			      16 0
> +			      17 0>;
> +		#io-channel-cells = <1>;
> +		ti,channel0-current-microamp = <5>;
> +		ti,channel3-current-microamp = <10>;
> +		};
> +	};
> +	...
> +};
> diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
> index 71763c5..f42eb8a 100644
> --- a/drivers/iio/adc/palmas_gpadc.c
> +++ b/drivers/iio/adc/palmas_gpadc.c
> @@ -21,6 +21,8 @@
>  #include <linux/pm.h>
>  #include <linux/mfd/palmas.h>
>  #include <linux/completion.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
>  #include <linux/iio/iio.h>
>  #include <linux/iio/machine.h>
>  #include <linux/iio/driver.h>
> @@ -460,6 +462,34 @@ static const struct iio_chan_spec palmas_gpadc_iio_channel[] = {
>  	PALMAS_ADC_CHAN_IIO(IN15, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
>  };
>  
> +static int palmas_gpadc_get_adc_dt_data(struct platform_device *pdev,
> +	struct palmas_gpadc_platform_data **gpadc_pdata)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct palmas_gpadc_platform_data *gp_data;
> +	int ret;
> +	u32 pval;
> +
> +	gp_data = devm_kzalloc(&pdev->dev, sizeof(*gp_data), GFP_KERNEL);
> +	if (!gp_data)
> +		return -ENOMEM;
> +
> +	ret = of_property_read_u32(np, "ti,channel0-current-microamp", &pval);
> +	if (!ret)
> +		gp_data->ch0_current = pval;
> +
> +	ret = of_property_read_u32(np, "ti,channel3-current-microamp", &pval);
> +	if (!ret)
> +		gp_data->ch3_current = pval;
> +
> +	gp_data->extended_delay = of_property_read_bool(np,
> +					"ti,enable-extended-delay");
> +
> +	*gpadc_pdata = gp_data;
> +
> +	return 0;
> +}
> +
>  static int palmas_gpadc_probe(struct platform_device *pdev)
>  {
>  	struct palmas_gpadc *adc;
> @@ -469,12 +499,17 @@ static int palmas_gpadc_probe(struct platform_device *pdev)
>  	int ret, i;
>  
>  	pdata = dev_get_platdata(pdev->dev.parent);
> -	if (!pdata || !pdata->gpadc_pdata) {
> -		dev_err(&pdev->dev, "No platform data\n");
> -		return -ENODEV;
> -	}
>  
> -	gpadc_pdata = pdata->gpadc_pdata;
> +	if (pdata && pdata->gpadc_pdata)
> +		gpadc_pdata = pdata->gpadc_pdata;
> +
> +	if (!gpadc_pdata && pdev->dev.of_node) {
> +		ret = palmas_gpadc_get_adc_dt_data(pdev, &gpadc_pdata);
> +		if (ret < 0)
> +			return ret;
> +	}
> +	if (!gpadc_pdata)
> +		return -EINVAL;
>  
>  	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc));
>  	if (!indio_dev) {
> @@ -790,12 +825,19 @@ static const struct dev_pm_ops palmas_pm_ops = {
>  				palmas_gpadc_resume)
>  };
>  
> +static const struct of_device_id of_palmas_gpadc_match_tbl[] = {
> +	{ .compatible = "ti,palmas-gpadc", },
> +	{ /* end */ }
> +};
> +MODULE_DEVICE_TABLE(of, of_palmas_gpadc_match_tbl);
> +
>  static struct platform_driver palmas_gpadc_driver = {
>  	.probe = palmas_gpadc_probe,
>  	.remove = palmas_gpadc_remove,
>  	.driver = {
>  		.name = MOD_NAME,
>  		.pm = &palmas_pm_ops,
> +		.of_match_table = of_palmas_gpadc_match_tbl,
>  	},
>  };
>  
> 

Re: [PATCH v3 1/3] iio:adc: add iio driver for Palmas (twl6035/7) gpadc

[H. Nikolaus Schaller]

Am 25.10.2015 um 13:04 schrieb Jonathan Cameron <jic23@kernel.org>:

> On 16/10/15 13:53, H. Nikolaus Schaller wrote:
>> This driver code was found as:
>> 
>> https://android.googlesource.com/kernel/tegra/+/aaabb2e045f31e5a970109ffdaae900dd403d17e/drivers/staging/iio/adc
>> 
>> Fixed various compilation issues and test this driver on omap5 evm.
>> 
>> Signed-off-by: Pradeep Goudagunta <pgoudagunta@nvidia.com>
>> Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
>> Signed-off-by: Marek Belisko <marek@goldelico.com>
>> Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
>> Reviewed-by: Jonathan Cameron <jic23@kernel.org>
>> Acked-by: Lee Jones <lee.jones@linaro.org>
> Applied to the togreg branch of iio.git - initially pushed out as testing.

Thanks! I was just working on a V4 - but that is a fix for omap5-uevm DT only. 
So I will remove the driver code and submit separately.

> Unfortunately the timing is such that it's not going to make the upcoming
> merge window so will be an early entry to linux-next after the merge window
> closes.

Well, that happens. We can forward-port it to our distribution kernel so that it is
already available to users.

> 
> Jonathan

BR,
Nikolaus

>> ---
>> drivers/iio/adc/Kconfig        |   8 +
>> drivers/iio/adc/Makefile       |   1 +
>> drivers/iio/adc/palmas_gpadc.c | 817 +++++++++++++++++++++++++++++++++++++++++
>> include/linux/mfd/palmas.h     |  75 ++--
>> 4 files changed, 877 insertions(+), 24 deletions(-)
>> create mode 100644 drivers/iio/adc/palmas_gpadc.c
>> 
>> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
>> index 50c103d..5100e56 100644
>> --- a/drivers/iio/adc/Kconfig
>> +++ b/drivers/iio/adc/Kconfig
>> @@ -264,6 +264,14 @@ config NAU7802
>> 	  To compile this driver as a module, choose M here: the
>> 	  module will be called nau7802.
>> 
>> +config PALMAS_GPADC
>> +	tristate "TI Palmas General Purpose ADC"
>> +	depends on MFD_PALMAS
>> +	help
>> +	  Palmas series pmic chip by Texas Instruments (twl6035/6037)
>> +	  is used in smartphones and tablets and supports a 16 channel
>> +	  general purpose ADC.
>> +
>> config QCOM_SPMI_IADC
>> 	tristate "Qualcomm SPMI PMIC current ADC"
>> 	depends on SPMI
>> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
>> index a096210..716f112 100644
>> --- a/drivers/iio/adc/Makefile
>> +++ b/drivers/iio/adc/Makefile
>> @@ -26,6 +26,7 @@ obj-$(CONFIG_MCP320X) += mcp320x.o
>> obj-$(CONFIG_MCP3422) += mcp3422.o
>> obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o
>> obj-$(CONFIG_NAU7802) += nau7802.o
>> +obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
>> obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o
>> obj-$(CONFIG_QCOM_SPMI_VADC) += qcom-spmi-vadc.o
>> obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o
>> diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
>> new file mode 100644
>> index 0000000..71763c5
>> --- /dev/null
>> +++ b/drivers/iio/adc/palmas_gpadc.c
>> @@ -0,0 +1,817 @@
>> +/*
>> + * palmas-adc.c -- TI PALMAS GPADC.
>> + *
>> + * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
>> + *
>> + * Author: Pradeep Goudagunta <pgoudagunta@nvidia.com>
>> + *
>> + * 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.
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/err.h>
>> +#include <linux/irq.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/slab.h>
>> +#include <linux/delay.h>
>> +#include <linux/i2c.h>
>> +#include <linux/pm.h>
>> +#include <linux/mfd/palmas.h>
>> +#include <linux/completion.h>
>> +#include <linux/iio/iio.h>
>> +#include <linux/iio/machine.h>
>> +#include <linux/iio/driver.h>
>> +
>> +#define MOD_NAME "palmas-gpadc"
>> +#define PALMAS_ADC_CONVERSION_TIMEOUT	(msecs_to_jiffies(5000))
>> +#define PALMAS_TO_BE_CALCULATED 0
>> +#define PALMAS_GPADC_TRIMINVALID	-1
>> +
>> +struct palmas_gpadc_info {
>> +/* calibration codes and regs */
>> +	int x1;	/* lower ideal code */
>> +	int x2;	/* higher ideal code */
>> +	int v1;	/* expected lower volt reading */
>> +	int v2;	/* expected higher volt reading */
>> +	u8 trim1_reg;	/* register number for lower trim */
>> +	u8 trim2_reg;	/* register number for upper trim */
>> +	int gain;	/* calculated from above (after reading trim regs) */
>> +	int offset;	/* calculated from above (after reading trim regs) */
>> +	int gain_error;	/* calculated from above (after reading trim regs) */
>> +	bool is_uncalibrated;	/* if channel has calibration data */
>> +};
>> +
>> +#define PALMAS_ADC_INFO(_chan, _x1, _x2, _v1, _v2, _t1, _t2, _is_uncalibrated) \
>> +	[PALMAS_ADC_CH_##_chan] = { \
>> +		.x1 = _x1, \
>> +		.x2 = _x2, \
>> +		.v1 = _v1, \
>> +		.v2 = _v2, \
>> +		.gain = PALMAS_TO_BE_CALCULATED, \
>> +		.offset = PALMAS_TO_BE_CALCULATED, \
>> +		.gain_error = PALMAS_TO_BE_CALCULATED, \
>> +		.trim1_reg = PALMAS_GPADC_TRIM##_t1, \
>> +		.trim2_reg = PALMAS_GPADC_TRIM##_t2,  \
>> +		.is_uncalibrated = _is_uncalibrated \
>> +	}
>> +
>> +static struct palmas_gpadc_info palmas_gpadc_info[] = {
>> +	PALMAS_ADC_INFO(IN0, 2064, 3112, 630, 950, 1, 2, false),
>> +	PALMAS_ADC_INFO(IN1, 2064, 3112, 630, 950, 1, 2, false),
>> +	PALMAS_ADC_INFO(IN2, 2064, 3112, 1260, 1900, 3, 4, false),
>> +	PALMAS_ADC_INFO(IN3, 2064, 3112, 630, 950, 1, 2, false),
>> +	PALMAS_ADC_INFO(IN4, 2064, 3112, 630, 950, 1, 2, false),
>> +	PALMAS_ADC_INFO(IN5, 2064, 3112, 630, 950, 1, 2, false),
>> +	PALMAS_ADC_INFO(IN6, 2064, 3112, 2520, 3800, 5, 6, false),
>> +	PALMAS_ADC_INFO(IN7, 2064, 3112, 2520, 3800, 7, 8, false),
>> +	PALMAS_ADC_INFO(IN8, 2064, 3112, 3150, 4750, 9, 10, false),
>> +	PALMAS_ADC_INFO(IN9, 2064, 3112, 5670, 8550, 11, 12, false),
>> +	PALMAS_ADC_INFO(IN10, 2064, 3112, 3465, 5225, 13, 14, false),
>> +	PALMAS_ADC_INFO(IN11, 0, 0, 0, 0, INVALID, INVALID, true),
>> +	PALMAS_ADC_INFO(IN12, 0, 0, 0, 0, INVALID, INVALID, true),
>> +	PALMAS_ADC_INFO(IN13, 0, 0, 0, 0, INVALID, INVALID, true),
>> +	PALMAS_ADC_INFO(IN14, 2064, 3112, 3645, 5225, 15, 16, false),
>> +	PALMAS_ADC_INFO(IN15, 0, 0, 0, 0, INVALID, INVALID, true),
>> +};
>> +
>> +/**
>> + * struct palmas_gpadc - the palmas_gpadc structure
>> + * @ch0_current:	channel 0 current source setting
>> + *			0: 0 uA
>> + *			1: 5 uA
>> + *			2: 15 uA
>> + *			3: 20 uA
>> + * @ch3_current:	channel 0 current source setting
>> + *			0: 0 uA
>> + *			1: 10 uA
>> + *			2: 400 uA
>> + *			3: 800 uA
>> + * @extended_delay:	enable the gpadc extended delay mode
>> + * @auto_conversion_period:	define the auto_conversion_period
>> + *
>> + * This is the palmas_gpadc structure to store run-time information
>> + * and pointers for this driver instance.
>> + */
>> +
>> +struct palmas_gpadc {
>> +	struct device			*dev;
>> +	struct palmas			*palmas;
>> +	u8				ch0_current;
>> +	u8				ch3_current;
>> +	bool				extended_delay;
>> +	int				irq;
>> +	int				irq_auto_0;
>> +	int				irq_auto_1;
>> +	struct palmas_gpadc_info	*adc_info;
>> +	struct completion		conv_completion;
>> +	struct palmas_adc_wakeup_property wakeup1_data;
>> +	struct palmas_adc_wakeup_property wakeup2_data;
>> +	bool				wakeup1_enable;
>> +	bool				wakeup2_enable;
>> +	int				auto_conversion_period;
>> +};
>> +
>> +/*
>> + * GPADC lock issue in AUTO mode.
>> + * Impact: In AUTO mode, GPADC conversion can be locked after disabling AUTO
>> + *	   mode feature.
>> + * Details:
>> + *	When the AUTO mode is the only conversion mode enabled, if the AUTO
>> + *	mode feature is disabled with bit GPADC_AUTO_CTRL.  AUTO_CONV1_EN = 0
>> + *	or bit GPADC_AUTO_CTRL.  AUTO_CONV0_EN = 0 during a conversion, the
>> + *	conversion mechanism can be seen as locked meaning that all following
>> + *	conversion will give 0 as a result.  Bit GPADC_STATUS.GPADC_AVAILABLE
>> + *	will stay at 0 meaning that GPADC is busy.  An RT conversion can unlock
>> + *	the GPADC.
>> + *
>> + * Workaround(s):
>> + *	To avoid the lock mechanism, the workaround to follow before any stop
>> + *	conversion request is:
>> + *	Force the GPADC state machine to be ON by using the GPADC_CTRL1.
>> + *		GPADC_FORCE bit = 1
>> + *	Shutdown the GPADC AUTO conversion using
>> + *		GPADC_AUTO_CTRL.SHUTDOWN_CONV[01] = 0.
>> + *	After 100us, force the GPADC state machine to be OFF by using the
>> + *		GPADC_CTRL1.  GPADC_FORCE bit = 0
>> + */
>> +
>> +static int palmas_disable_auto_conversion(struct palmas_gpadc *adc)
>> +{
>> +	int ret;
>> +
>> +	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
>> +			PALMAS_GPADC_CTRL1,
>> +			PALMAS_GPADC_CTRL1_GPADC_FORCE,
>> +			PALMAS_GPADC_CTRL1_GPADC_FORCE);
>> +	if (ret < 0) {
>> +		dev_err(adc->dev, "GPADC_CTRL1 update failed: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
>> +			PALMAS_GPADC_AUTO_CTRL,
>> +			PALMAS_GPADC_AUTO_CTRL_SHUTDOWN_CONV1 |
>> +			PALMAS_GPADC_AUTO_CTRL_SHUTDOWN_CONV0,
>> +			0);
>> +	if (ret < 0) {
>> +		dev_err(adc->dev, "AUTO_CTRL update failed: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	udelay(100);
>> +
>> +	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
>> +			PALMAS_GPADC_CTRL1,
>> +			PALMAS_GPADC_CTRL1_GPADC_FORCE, 0);
>> +	if (ret < 0)
>> +		dev_err(adc->dev, "GPADC_CTRL1 update failed: %d\n", ret);
>> +
>> +	return ret;
>> +}
>> +
>> +static irqreturn_t palmas_gpadc_irq(int irq, void *data)
>> +{
>> +	struct palmas_gpadc *adc = data;
>> +
>> +	complete(&adc->conv_completion);
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static irqreturn_t palmas_gpadc_irq_auto(int irq, void *data)
>> +{
>> +	struct palmas_gpadc *adc = data;
>> +
>> +	dev_dbg(adc->dev, "Threshold interrupt %d occurs\n", irq);
>> +	palmas_disable_auto_conversion(adc);
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static int palmas_gpadc_start_mask_interrupt(struct palmas_gpadc *adc,
>> +						bool mask)
>> +{
>> +	int ret;
>> +
>> +	if (!mask)
>> +		ret = palmas_update_bits(adc->palmas, PALMAS_INTERRUPT_BASE,
>> +					PALMAS_INT3_MASK,
>> +					PALMAS_INT3_MASK_GPADC_EOC_SW, 0);
>> +	else
>> +		ret = palmas_update_bits(adc->palmas, PALMAS_INTERRUPT_BASE,
>> +					PALMAS_INT3_MASK,
>> +					PALMAS_INT3_MASK_GPADC_EOC_SW,
>> +					PALMAS_INT3_MASK_GPADC_EOC_SW);
>> +	if (ret < 0)
>> +		dev_err(adc->dev, "GPADC INT MASK update failed: %d\n", ret);
>> +
>> +	return ret;
>> +}
>> +
>> +static int palmas_gpadc_enable(struct palmas_gpadc *adc, int adc_chan,
>> +			       int enable)
>> +{
>> +	unsigned int mask, val;
>> +	int ret;
>> +
>> +	if (enable) {
>> +		val = (adc->extended_delay
>> +			<< PALMAS_GPADC_RT_CTRL_EXTEND_DELAY_SHIFT);
>> +		ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
>> +					PALMAS_GPADC_RT_CTRL,
>> +					PALMAS_GPADC_RT_CTRL_EXTEND_DELAY, val);
>> +		if (ret < 0) {
>> +			dev_err(adc->dev, "RT_CTRL update failed: %d\n", ret);
>> +			return ret;
>> +		}
>> +
>> +		mask = (PALMAS_GPADC_CTRL1_CURRENT_SRC_CH0_MASK |
>> +			PALMAS_GPADC_CTRL1_CURRENT_SRC_CH3_MASK |
>> +			PALMAS_GPADC_CTRL1_GPADC_FORCE);
>> +		val = (adc->ch0_current
>> +			<< PALMAS_GPADC_CTRL1_CURRENT_SRC_CH0_SHIFT);
>> +		val |= (adc->ch3_current
>> +			<< PALMAS_GPADC_CTRL1_CURRENT_SRC_CH3_SHIFT);
>> +		val |= PALMAS_GPADC_CTRL1_GPADC_FORCE;
>> +		ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
>> +				PALMAS_GPADC_CTRL1, mask, val);
>> +		if (ret < 0) {
>> +			dev_err(adc->dev,
>> +				"Failed to update current setting: %d\n", ret);
>> +			return ret;
>> +		}
>> +
>> +		mask = (PALMAS_GPADC_SW_SELECT_SW_CONV0_SEL_MASK |
>> +			PALMAS_GPADC_SW_SELECT_SW_CONV_EN);
>> +		val = (adc_chan | PALMAS_GPADC_SW_SELECT_SW_CONV_EN);
>> +		ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
>> +				PALMAS_GPADC_SW_SELECT, mask, val);
>> +		if (ret < 0) {
>> +			dev_err(adc->dev, "SW_SELECT update failed: %d\n", ret);
>> +			return ret;
>> +		}
>> +	} else {
>> +		ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
>> +				PALMAS_GPADC_SW_SELECT, 0);
>> +		if (ret < 0)
>> +			dev_err(adc->dev, "SW_SELECT write failed: %d\n", ret);
>> +
>> +		ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
>> +				PALMAS_GPADC_CTRL1,
>> +				PALMAS_GPADC_CTRL1_GPADC_FORCE, 0);
>> +		if (ret < 0) {
>> +			dev_err(adc->dev, "CTRL1 update failed: %d\n", ret);
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static int palmas_gpadc_read_prepare(struct palmas_gpadc *adc, int adc_chan)
>> +{
>> +	int ret;
>> +
>> +	ret = palmas_gpadc_enable(adc, adc_chan, true);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return palmas_gpadc_start_mask_interrupt(adc, 0);
>> +}
>> +
>> +static void palmas_gpadc_read_done(struct palmas_gpadc *adc, int adc_chan)
>> +{
>> +	palmas_gpadc_start_mask_interrupt(adc, 1);
>> +	palmas_gpadc_enable(adc, adc_chan, false);
>> +}
>> +
>> +static int palmas_gpadc_calibrate(struct palmas_gpadc *adc, int adc_chan)
>> +{
>> +	int k;
>> +	int d1;
>> +	int d2;
>> +	int ret;
>> +	int gain;
>> +	int x1 =  adc->adc_info[adc_chan].x1;
>> +	int x2 =  adc->adc_info[adc_chan].x2;
>> +	int v1 = adc->adc_info[adc_chan].v1;
>> +	int v2 = adc->adc_info[adc_chan].v2;
>> +
>> +	ret = palmas_read(adc->palmas, PALMAS_TRIM_GPADC_BASE,
>> +				adc->adc_info[adc_chan].trim1_reg, &d1);
>> +	if (ret < 0) {
>> +		dev_err(adc->dev, "TRIM read failed: %d\n", ret);
>> +		goto scrub;
>> +	}
>> +
>> +	ret = palmas_read(adc->palmas, PALMAS_TRIM_GPADC_BASE,
>> +				adc->adc_info[adc_chan].trim2_reg, &d2);
>> +	if (ret < 0) {
>> +		dev_err(adc->dev, "TRIM read failed: %d\n", ret);
>> +		goto scrub;
>> +	}
>> +
>> +	/* gain error calculation */
>> +	k = (1000 + (1000 * (d2 - d1)) / (x2 - x1));
>> +
>> +	/* gain calculation */
>> +	gain = ((v2 - v1) * 1000) / (x2 - x1);
>> +
>> +	adc->adc_info[adc_chan].gain_error = k;
>> +	adc->adc_info[adc_chan].gain = gain;
>> +	/* offset Calculation */
>> +	adc->adc_info[adc_chan].offset = (d1 * 1000) - ((k - 1000) * x1);
>> +
>> +scrub:
>> +	return ret;
>> +}
>> +
>> +static int palmas_gpadc_start_conversion(struct palmas_gpadc *adc, int adc_chan)
>> +{
>> +	unsigned int val;
>> +	int ret;
>> +
>> +	init_completion(&adc->conv_completion);
>> +	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
>> +				PALMAS_GPADC_SW_SELECT,
>> +				PALMAS_GPADC_SW_SELECT_SW_START_CONV0,
>> +				PALMAS_GPADC_SW_SELECT_SW_START_CONV0);
>> +	if (ret < 0) {
>> +		dev_err(adc->dev, "SELECT_SW_START write failed: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	ret = wait_for_completion_timeout(&adc->conv_completion,
>> +				PALMAS_ADC_CONVERSION_TIMEOUT);
>> +	if (ret == 0) {
>> +		dev_err(adc->dev, "conversion not completed\n");
>> +		return -ETIMEDOUT;
>> +	}
>> +
>> +	ret = palmas_bulk_read(adc->palmas, PALMAS_GPADC_BASE,
>> +				PALMAS_GPADC_SW_CONV0_LSB, &val, 2);
>> +	if (ret < 0) {
>> +		dev_err(adc->dev, "SW_CONV0_LSB read failed: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	ret = val & 0xFFF;
>> +
>> +	return ret;
>> +}
>> +
>> +static int palmas_gpadc_get_calibrated_code(struct palmas_gpadc *adc,
>> +						int adc_chan, int val)
>> +{
>> +	if (!adc->adc_info[adc_chan].is_uncalibrated)
>> +		val  = (val*1000 - adc->adc_info[adc_chan].offset) /
>> +					adc->adc_info[adc_chan].gain_error;
>> +
>> +	if (val < 0) {
>> +		dev_err(adc->dev, "Mismatch with calibration\n");
>> +		return 0;
>> +	}
>> +
>> +	val = (val * adc->adc_info[adc_chan].gain) / 1000;
>> +
>> +	return val;
>> +}
>> +
>> +static int palmas_gpadc_read_raw(struct iio_dev *indio_dev,
>> +	struct iio_chan_spec const *chan, int *val, int *val2, long mask)
>> +{
>> +	struct  palmas_gpadc *adc = iio_priv(indio_dev);
>> +	int adc_chan = chan->channel;
>> +	int ret = 0;
>> +
>> +	if (adc_chan > PALMAS_ADC_CH_MAX)
>> +		return -EINVAL;
>> +
>> +	mutex_lock(&indio_dev->mlock);
>> +
>> +	switch (mask) {
>> +	case IIO_CHAN_INFO_RAW:
>> +	case IIO_CHAN_INFO_PROCESSED:
>> +		ret = palmas_gpadc_read_prepare(adc, adc_chan);
>> +		if (ret < 0)
>> +			goto out;
>> +
>> +		ret = palmas_gpadc_start_conversion(adc, adc_chan);
>> +		if (ret < 0) {
>> +			dev_err(adc->dev,
>> +			"ADC start conversion failed\n");
>> +			goto out;
>> +		}
>> +
>> +		if (mask == IIO_CHAN_INFO_PROCESSED)
>> +			ret = palmas_gpadc_get_calibrated_code(
>> +							adc, adc_chan, ret);
>> +
>> +		*val = ret;
>> +
>> +		ret = IIO_VAL_INT;
>> +		goto out;
>> +	}
>> +
>> +	mutex_unlock(&indio_dev->mlock);
>> +	return ret;
>> +
>> +out:
>> +	palmas_gpadc_read_done(adc, adc_chan);
>> +	mutex_unlock(&indio_dev->mlock);
>> +
>> +	return ret;
>> +}
>> +
>> +static const struct iio_info palmas_gpadc_iio_info = {
>> +	.read_raw = palmas_gpadc_read_raw,
>> +	.driver_module = THIS_MODULE,
>> +};
>> +
>> +#define PALMAS_ADC_CHAN_IIO(chan, _type, chan_info)	\
>> +{							\
>> +	.datasheet_name = PALMAS_DATASHEET_NAME(chan),	\
>> +	.type = _type,					\
>> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |	\
>> +			BIT(chan_info),			\
>> +	.indexed = 1,					\
>> +	.channel = PALMAS_ADC_CH_##chan,		\
>> +}
>> +
>> +static const struct iio_chan_spec palmas_gpadc_iio_channel[] = {
>> +	PALMAS_ADC_CHAN_IIO(IN0, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
>> +	PALMAS_ADC_CHAN_IIO(IN1, IIO_TEMP, IIO_CHAN_INFO_RAW),
>> +	PALMAS_ADC_CHAN_IIO(IN2, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
>> +	PALMAS_ADC_CHAN_IIO(IN3, IIO_TEMP, IIO_CHAN_INFO_RAW),
>> +	PALMAS_ADC_CHAN_IIO(IN4, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
>> +	PALMAS_ADC_CHAN_IIO(IN5, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
>> +	PALMAS_ADC_CHAN_IIO(IN6, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
>> +	PALMAS_ADC_CHAN_IIO(IN7, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
>> +	PALMAS_ADC_CHAN_IIO(IN8, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
>> +	PALMAS_ADC_CHAN_IIO(IN9, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
>> +	PALMAS_ADC_CHAN_IIO(IN10, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
>> +	PALMAS_ADC_CHAN_IIO(IN11, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
>> +	PALMAS_ADC_CHAN_IIO(IN12, IIO_TEMP, IIO_CHAN_INFO_RAW),
>> +	PALMAS_ADC_CHAN_IIO(IN13, IIO_TEMP, IIO_CHAN_INFO_RAW),
>> +	PALMAS_ADC_CHAN_IIO(IN14, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
>> +	PALMAS_ADC_CHAN_IIO(IN15, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
>> +};
>> +
>> +static int palmas_gpadc_probe(struct platform_device *pdev)
>> +{
>> +	struct palmas_gpadc *adc;
>> +	struct palmas_platform_data *pdata;
>> +	struct palmas_gpadc_platform_data *gpadc_pdata = NULL;
>> +	struct iio_dev *indio_dev;
>> +	int ret, i;
>> +
>> +	pdata = dev_get_platdata(pdev->dev.parent);
>> +	if (!pdata || !pdata->gpadc_pdata) {
>> +		dev_err(&pdev->dev, "No platform data\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	gpadc_pdata = pdata->gpadc_pdata;
>> +
>> +	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc));
>> +	if (!indio_dev) {
>> +		dev_err(&pdev->dev, "iio_device_alloc failed\n");
>> +		return -ENOMEM;
>> +	}
>> +
>> +	adc = iio_priv(indio_dev);
>> +	adc->dev = &pdev->dev;
>> +	adc->palmas = dev_get_drvdata(pdev->dev.parent);
>> +	adc->adc_info = palmas_gpadc_info;
>> +	init_completion(&adc->conv_completion);
>> +	dev_set_drvdata(&pdev->dev, indio_dev);
>> +
>> +	adc->auto_conversion_period = gpadc_pdata->auto_conversion_period_ms;
>> +	adc->irq = palmas_irq_get_virq(adc->palmas, PALMAS_GPADC_EOC_SW_IRQ);
>> +	if (adc->irq < 0) {
>> +		dev_err(adc->dev,
>> +			"get virq failed: %d\n", adc->irq);
>> +		ret = adc->irq;
>> +		goto out;
>> +	}
>> +	ret = request_threaded_irq(adc->irq, NULL,
>> +		palmas_gpadc_irq,
>> +		IRQF_ONESHOT | IRQF_EARLY_RESUME, dev_name(adc->dev),
>> +		adc);
>> +	if (ret < 0) {
>> +		dev_err(adc->dev,
>> +			"request irq %d failed: %d\n", adc->irq, ret);
>> +		goto out;
>> +	}
>> +
>> +	if (gpadc_pdata->adc_wakeup1_data) {
>> +		memcpy(&adc->wakeup1_data, gpadc_pdata->adc_wakeup1_data,
>> +			sizeof(adc->wakeup1_data));
>> +		adc->wakeup1_enable = true;
>> +		adc->irq_auto_0 =  platform_get_irq(pdev, 1);
>> +		ret = request_threaded_irq(adc->irq_auto_0, NULL,
>> +				palmas_gpadc_irq_auto,
>> +				IRQF_ONESHOT | IRQF_EARLY_RESUME,
>> +				"palmas-adc-auto-0", adc);
>> +		if (ret < 0) {
>> +			dev_err(adc->dev, "request auto0 irq %d failed: %d\n",
>> +				adc->irq_auto_0, ret);
>> +			goto out_irq_free;
>> +		}
>> +	}
>> +
>> +	if (gpadc_pdata->adc_wakeup2_data) {
>> +		memcpy(&adc->wakeup2_data, gpadc_pdata->adc_wakeup2_data,
>> +				sizeof(adc->wakeup2_data));
>> +		adc->wakeup2_enable = true;
>> +		adc->irq_auto_1 =  platform_get_irq(pdev, 2);
>> +		ret = request_threaded_irq(adc->irq_auto_1, NULL,
>> +				palmas_gpadc_irq_auto,
>> +				IRQF_ONESHOT | IRQF_EARLY_RESUME,
>> +				"palmas-adc-auto-1", adc);
>> +		if (ret < 0) {
>> +			dev_err(adc->dev, "request auto1 irq %d failed: %d\n",
>> +				adc->irq_auto_1, ret);
>> +			goto out_irq_auto0_free;
>> +		}
>> +	}
>> +
>> +	/* set the current source 0 (value 0/5/15/20 uA => 0..3) */
>> +	if (gpadc_pdata->ch0_current <= 1)
>> +		adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_0;
>> +	else if (gpadc_pdata->ch0_current <= 5)
>> +		adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_5;
>> +	else if (gpadc_pdata->ch0_current <= 15)
>> +		adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_15;
>> +	else
>> +		adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_20;
>> +
>> +	/* set the current source 3 (value 0/10/400/800 uA => 0..3) */
>> +	if (gpadc_pdata->ch3_current <= 1)
>> +		adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_0;
>> +	else if (gpadc_pdata->ch3_current <= 10)
>> +		adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_10;
>> +	else if (gpadc_pdata->ch3_current <= 400)
>> +		adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_400;
>> +	else
>> +		adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_800;
>> +
>> +	adc->extended_delay = gpadc_pdata->extended_delay;
>> +
>> +	indio_dev->name = MOD_NAME;
>> +	indio_dev->dev.parent = &pdev->dev;
>> +	indio_dev->info = &palmas_gpadc_iio_info;
>> +	indio_dev->modes = INDIO_DIRECT_MODE;
>> +	indio_dev->channels = palmas_gpadc_iio_channel;
>> +	indio_dev->num_channels = ARRAY_SIZE(palmas_gpadc_iio_channel);
>> +
>> +	ret = iio_device_register(indio_dev);
>> +	if (ret < 0) {
>> +		dev_err(adc->dev, "iio_device_register() failed: %d\n", ret);
>> +		goto out_irq_auto1_free;
>> +	}
>> +
>> +	device_set_wakeup_capable(&pdev->dev, 1);
>> +	for (i = 0; i < PALMAS_ADC_CH_MAX; i++) {
>> +		if (!(adc->adc_info[i].is_uncalibrated))
>> +			palmas_gpadc_calibrate(adc, i);
>> +	}
>> +
>> +	if (adc->wakeup1_enable || adc->wakeup2_enable)
>> +		device_wakeup_enable(&pdev->dev);
>> +
>> +	return 0;
>> +
>> +out_irq_auto1_free:
>> +	if (gpadc_pdata->adc_wakeup2_data)
>> +		free_irq(adc->irq_auto_1, adc);
>> +out_irq_auto0_free:
>> +	if (gpadc_pdata->adc_wakeup1_data)
>> +		free_irq(adc->irq_auto_0, adc);
>> +out_irq_free:
>> +	free_irq(adc->irq, adc);
>> +out:
>> +	return ret;
>> +}
>> +
>> +static int palmas_gpadc_remove(struct platform_device *pdev)
>> +{
>> +	struct iio_dev *indio_dev = dev_to_iio_dev(&pdev->dev);
>> +	struct palmas_gpadc *adc = iio_priv(indio_dev);
>> +
>> +	if (adc->wakeup1_enable || adc->wakeup2_enable)
>> +		device_wakeup_disable(&pdev->dev);
>> +	iio_device_unregister(indio_dev);
>> +	free_irq(adc->irq, adc);
>> +	if (adc->wakeup1_enable)
>> +		free_irq(adc->irq_auto_0, adc);
>> +	if (adc->wakeup2_enable)
>> +		free_irq(adc->irq_auto_1, adc);
>> +
>> +	return 0;
>> +}
>> +
>> +#ifdef CONFIG_PM_SLEEP
>> +static int palmas_adc_wakeup_configure(struct palmas_gpadc *adc)
>> +{
>> +	int adc_period, conv;
>> +	int i;
>> +	int ch0 = 0, ch1 = 0;
>> +	int thres;
>> +	int ret;
>> +
>> +	adc_period = adc->auto_conversion_period;
>> +	for (i = 0; i < 16; ++i) {
>> +		if (((1000 * (1 << i)) / 32) < adc_period)
>> +			continue;
>> +	}
>> +	if (i > 0)
>> +		i--;
>> +	adc_period = i;
>> +	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
>> +			PALMAS_GPADC_AUTO_CTRL,
>> +			PALMAS_GPADC_AUTO_CTRL_COUNTER_CONV_MASK,
>> +			adc_period);
>> +	if (ret < 0) {
>> +		dev_err(adc->dev, "AUTO_CTRL write failed: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	conv = 0;
>> +	if (adc->wakeup1_enable) {
>> +		int polarity;
>> +
>> +		ch0 = adc->wakeup1_data.adc_channel_number;
>> +		conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV0_EN;
>> +		if (adc->wakeup1_data.adc_high_threshold > 0) {
>> +			thres = adc->wakeup1_data.adc_high_threshold;
>> +			polarity = 0;
>> +		} else {
>> +			thres = adc->wakeup1_data.adc_low_threshold;
>> +			polarity = PALMAS_GPADC_THRES_CONV0_MSB_THRES_CONV0_POL;
>> +		}
>> +
>> +		ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
>> +				PALMAS_GPADC_THRES_CONV0_LSB, thres & 0xFF);
>> +		if (ret < 0) {
>> +			dev_err(adc->dev,
>> +				"THRES_CONV0_LSB write failed: %d\n", ret);
>> +			return ret;
>> +		}
>> +
>> +		ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
>> +				PALMAS_GPADC_THRES_CONV0_MSB,
>> +				((thres >> 8) & 0xF) | polarity);
>> +		if (ret < 0) {
>> +			dev_err(adc->dev,
>> +				"THRES_CONV0_MSB write failed: %d\n", ret);
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	if (adc->wakeup2_enable) {
>> +		int polarity;
>> +
>> +		ch1 = adc->wakeup2_data.adc_channel_number;
>> +		conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV1_EN;
>> +		if (adc->wakeup2_data.adc_high_threshold > 0) {
>> +			thres = adc->wakeup2_data.adc_high_threshold;
>> +			polarity = 0;
>> +		} else {
>> +			thres = adc->wakeup2_data.adc_low_threshold;
>> +			polarity = PALMAS_GPADC_THRES_CONV1_MSB_THRES_CONV1_POL;
>> +		}
>> +
>> +		ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
>> +				PALMAS_GPADC_THRES_CONV1_LSB, thres & 0xFF);
>> +		if (ret < 0) {
>> +			dev_err(adc->dev,
>> +				"THRES_CONV1_LSB write failed: %d\n", ret);
>> +			return ret;
>> +		}
>> +
>> +		ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
>> +				PALMAS_GPADC_THRES_CONV1_MSB,
>> +				((thres >> 8) & 0xF) | polarity);
>> +		if (ret < 0) {
>> +			dev_err(adc->dev,
>> +				"THRES_CONV1_MSB write failed: %d\n", ret);
>> +			return ret;
>> +		}
>> +	}
>> +
>> +	ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
>> +			PALMAS_GPADC_AUTO_SELECT, (ch1 << 4) | ch0);
>> +	if (ret < 0) {
>> +		dev_err(adc->dev, "AUTO_SELECT write failed: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
>> +			PALMAS_GPADC_AUTO_CTRL,
>> +			PALMAS_GPADC_AUTO_CTRL_AUTO_CONV1_EN |
>> +			PALMAS_GPADC_AUTO_CTRL_AUTO_CONV0_EN, conv);
>> +	if (ret < 0)
>> +		dev_err(adc->dev, "AUTO_CTRL write failed: %d\n", ret);
>> +
>> +	return ret;
>> +}
>> +
>> +static int palmas_adc_wakeup_reset(struct palmas_gpadc *adc)
>> +{
>> +	int ret;
>> +
>> +	ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
>> +			PALMAS_GPADC_AUTO_SELECT, 0);
>> +	if (ret < 0) {
>> +		dev_err(adc->dev, "AUTO_SELECT write failed: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	ret = palmas_disable_auto_conversion(adc);
>> +	if (ret < 0)
>> +		dev_err(adc->dev, "Disable auto conversion failed: %d\n", ret);
>> +
>> +	return ret;
>> +}
>> +
>> +static int palmas_gpadc_suspend(struct device *dev)
>> +{
>> +	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
>> +	struct palmas_gpadc *adc = iio_priv(indio_dev);
>> +	int wakeup = adc->wakeup1_enable || adc->wakeup2_enable;
>> +	int ret;
>> +
>> +	if (!device_may_wakeup(dev) || !wakeup)
>> +		return 0;
>> +
>> +	ret = palmas_adc_wakeup_configure(adc);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	if (adc->wakeup1_enable)
>> +		enable_irq_wake(adc->irq_auto_0);
>> +
>> +	if (adc->wakeup2_enable)
>> +		enable_irq_wake(adc->irq_auto_1);
>> +
>> +	return 0;
>> +}
>> +
>> +static int palmas_gpadc_resume(struct device *dev)
>> +{
>> +	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
>> +	struct palmas_gpadc *adc = iio_priv(indio_dev);
>> +	int wakeup = adc->wakeup1_enable || adc->wakeup2_enable;
>> +	int ret;
>> +
>> +	if (!device_may_wakeup(dev) || !wakeup)
>> +		return 0;
>> +
>> +	ret = palmas_adc_wakeup_reset(adc);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	if (adc->wakeup1_enable)
>> +		disable_irq_wake(adc->irq_auto_0);
>> +
>> +	if (adc->wakeup2_enable)
>> +		disable_irq_wake(adc->irq_auto_1);
>> +
>> +	return 0;
>> +};
>> +#endif
>> +
>> +static const struct dev_pm_ops palmas_pm_ops = {
>> +	SET_SYSTEM_SLEEP_PM_OPS(palmas_gpadc_suspend,
>> +				palmas_gpadc_resume)
>> +};
>> +
>> +static struct platform_driver palmas_gpadc_driver = {
>> +	.probe = palmas_gpadc_probe,
>> +	.remove = palmas_gpadc_remove,
>> +	.driver = {
>> +		.name = MOD_NAME,
>> +		.pm = &palmas_pm_ops,
>> +	},
>> +};
>> +
>> +static int __init palmas_gpadc_init(void)
>> +{
>> +	return platform_driver_register(&palmas_gpadc_driver);
>> +}
>> +module_init(palmas_gpadc_init);
>> +
>> +static void __exit palmas_gpadc_exit(void)
>> +{
>> +	platform_driver_unregister(&palmas_gpadc_driver);
>> +}
>> +module_exit(palmas_gpadc_exit);
>> +
>> +MODULE_DESCRIPTION("palmas GPADC driver");
>> +MODULE_AUTHOR("Pradeep Goudagunta<pgoudagunta@nvidia.com>");
>> +MODULE_ALIAS("platform:palmas-gpadc");
>> +MODULE_LICENSE("GPL v2");
>> diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h
>> index 13e1d96..c800dbc 100644
>> --- a/include/linux/mfd/palmas.h
>> +++ b/include/linux/mfd/palmas.h
>> @@ -134,21 +134,32 @@ struct palmas_pmic_driver_data {
>> 			    struct regulator_config config);
>> };
>> 
>> +struct palmas_adc_wakeup_property {
>> +	int adc_channel_number;
>> +	int adc_high_threshold;
>> +	int adc_low_threshold;
>> +};
>> +
>> struct palmas_gpadc_platform_data {
>> 	/* Channel 3 current source is only enabled during conversion */
>> -	int ch3_current;
>> +	int ch3_current;	/* 0: off; 1: 10uA; 2: 400uA; 3: 800 uA */
>> 
>> 	/* Channel 0 current source can be used for battery detection.
>> 	 * If used for battery detection this will cause a permanent current
>> 	 * consumption depending on current level set here.
>> 	 */
>> -	int ch0_current;
>> +	int ch0_current;	/* 0: off; 1: 5uA; 2: 15uA; 3: 20 uA */
>> +	bool extended_delay;	/* use extended delay for conversion */
>> 
>> 	/* default BAT_REMOVAL_DAT setting on device probe */
>> 	int bat_removal;
>> 
>> 	/* Sets the START_POLARITY bit in the RT_CTRL register */
>> 	int start_polarity;
>> +
>> +	int auto_conversion_period_ms;
>> +	struct palmas_adc_wakeup_property *adc_wakeup1_data;
>> +	struct palmas_adc_wakeup_property *adc_wakeup2_data;
>> };
>> 
>> struct palmas_reg_init {
>> @@ -405,28 +416,7 @@ struct palmas_gpadc_calibration {
>> 	s32 offset_error;
>> };
>> 
>> -struct palmas_gpadc {
>> -	struct device *dev;
>> -	struct palmas *palmas;
>> -
>> -	int ch3_current;
>> -	int ch0_current;
>> -
>> -	int gpadc_force;
>> -
>> -	int bat_removal;
>> -
>> -	struct mutex reading_lock;
>> -	struct completion irq_complete;
>> -
>> -	int eoc_sw_irq;
>> -
>> -	struct palmas_gpadc_calibration *palmas_cal_tbl;
>> -
>> -	int conv0_channel;
>> -	int conv1_channel;
>> -	int rt_channel;
>> -};
>> +#define PALMAS_DATASHEET_NAME(_name)	"palmas-gpadc-chan-"#_name
>> 
>> struct palmas_gpadc_result {
>> 	s32 raw_code;
>> @@ -520,6 +510,43 @@ enum palmas_irqs {
>> 	PALMAS_NUM_IRQ,
>> };
>> 
>> +/* Palmas GPADC Channels */
>> +enum {
>> +	PALMAS_ADC_CH_IN0,
>> +	PALMAS_ADC_CH_IN1,
>> +	PALMAS_ADC_CH_IN2,
>> +	PALMAS_ADC_CH_IN3,
>> +	PALMAS_ADC_CH_IN4,
>> +	PALMAS_ADC_CH_IN5,
>> +	PALMAS_ADC_CH_IN6,
>> +	PALMAS_ADC_CH_IN7,
>> +	PALMAS_ADC_CH_IN8,
>> +	PALMAS_ADC_CH_IN9,
>> +	PALMAS_ADC_CH_IN10,
>> +	PALMAS_ADC_CH_IN11,
>> +	PALMAS_ADC_CH_IN12,
>> +	PALMAS_ADC_CH_IN13,
>> +	PALMAS_ADC_CH_IN14,
>> +	PALMAS_ADC_CH_IN15,
>> +	PALMAS_ADC_CH_MAX,
>> +};
>> +
>> +/* Palmas GPADC Channel0 Current Source */
>> +enum {
>> +	PALMAS_ADC_CH0_CURRENT_SRC_0,
>> +	PALMAS_ADC_CH0_CURRENT_SRC_5,
>> +	PALMAS_ADC_CH0_CURRENT_SRC_15,
>> +	PALMAS_ADC_CH0_CURRENT_SRC_20,
>> +};
>> +
>> +/* Palmas GPADC Channel3 Current Source */
>> +enum {
>> +	PALMAS_ADC_CH3_CURRENT_SRC_0,
>> +	PALMAS_ADC_CH3_CURRENT_SRC_10,
>> +	PALMAS_ADC_CH3_CURRENT_SRC_400,
>> +	PALMAS_ADC_CH3_CURRENT_SRC_800,
>> +};
>> +
>> struct palmas_pmic {
>> 	struct palmas *palmas;
>> 	struct device *dev;
>> 
>