Date:	Wed, 11 Jun 2014 12:11:28 +0100
From:	Adam Thomson <Adam.Thomson.Opensource@...semi.com>
To:	Lee Jones <lee.jones@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Jonathan Cameron <jic23@...nel.org>,
	<linux-iio@...r.kernel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, <devicetree@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>, <support.opensource@...semi.com>
Subject: [PATCH 4/8] iio: Add support for DA9150 GPADC

This patch adds support for DA9150 Charger & Fuel-Gauge IC GPADC.

Signed-off-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
---
 drivers/iio/adc/Kconfig          |   9 +
 drivers/iio/adc/Makefile         |   1 +
 drivers/iio/adc/da9150-gpadc.c   | 396 +++++++++++++++++++++++++++++++++++++++
 include/linux/mfd/da9150/gpadc.h |  71 +++++++
 4 files changed, 477 insertions(+)
 create mode 100644 drivers/iio/adc/da9150-gpadc.c
 create mode 100644 include/linux/mfd/da9150/gpadc.h

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 24c28e3..f5e9f72 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -105,6 +105,15 @@ config AT91_ADC
 	help
 	  Say yes here to build support for Atmel AT91 ADC.

+config DA9150_GPADC
+	tristate "Dialog DA9150 GPADC driver support"
+	depends on MFD_DA9150
+	help
+	  Say yes here to build support for Dialog DA9150 GPADC.
+
+	  This driver can also be built as a module. If chosen, the module name
+	  will be da9150-gpadc.
+
 config EXYNOS_ADC
 	tristate "Exynos ADC driver support"
 	depends on OF
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index ab346d8..414b22f 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_AD7791) += ad7791.o
 obj-$(CONFIG_AD7793) += ad7793.o
 obj-$(CONFIG_AD7887) += ad7887.o
 obj-$(CONFIG_AT91_ADC) += at91_adc.o
+obj-$(CONFIG_DA9150_GPADC) += da9150-gpadc.o
 obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
 obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
 obj-$(CONFIG_MAX1363) += max1363.o
diff --git a/drivers/iio/adc/da9150-gpadc.c b/drivers/iio/adc/da9150-gpadc.c
new file mode 100644
index 0000000..2107f86
--- /dev/null
+++ b/drivers/iio/adc/da9150-gpadc.c
@@ -0,0 +1,396 @@
+/*
+ * DA9150 GPADC Driver
+ *
+ * Copyright (c) 2014 Dialog Semiconductor
+ *
+ * Author: Adam Thomson <Adam.Thomson.Opensource@...semi.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;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+
+#include <linux/mfd/da9150/core.h>
+#include <linux/mfd/da9150/pdata.h>
+#include <linux/mfd/da9150/registers.h>
+#include <linux/mfd/da9150/gpadc.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/machine.h>
+#include <linux/iio/driver.h>
+
+
+/*
+ * IRQ Handling
+ */
+
+static irqreturn_t da9150_gpadc_irq(int irq, void *data)
+{
+
+	struct da9150_gpadc *gpadc = data;
+
+	complete(&gpadc->complete);
+
+	return IRQ_HANDLED;
+}
+
+
+/*
+ * GPADC access
+ */
+
+static inline int da9150_gpadc_gpio_2v_voltage_now(int raw_val)
+{
+	/* Convert to uV */
+	return (((3 * ((raw_val * 1000) + 500)) / 2048) * 1000);
+}
+
+static inline int da9150_gpadc_gpio_5v_voltage_now(int raw_val)
+{
+	/* Convert to uV */
+	return (((6 * ((raw_val * 1000) + 500)) / 1024) * 1000);
+}
+
+static inline int da9150_gpadc_ibus_current_avg(int raw_val)
+{
+	/* Convert to uA */
+	return (((4 * ((raw_val * 1000) + 500)) / 2048) * 1000);
+}
+
+static inline int da9150_gpadc_vbus_6v_voltage_now(int raw_val)
+{
+	/* Convert to uV */
+	return (((3 * ((raw_val * 1000) + 500)) / 512) * 1000);
+}
+
+static inline int da9150_gpadc_vbus_21v_voltage_now(int raw_val)
+{
+	/* Convert to uV */
+	return (((21 * ((raw_val * 1000) + 500)) / 1024) * 1000);
+}
+
+static inline int da9150_gpadc_vsys_6v_voltage_now(int raw_val)
+{
+	/* Convert to uV */
+	return (((3 * ((raw_val * 1000) + 500)) / 512) * 1000);
+}
+
+static inline int da9150_gpadc_vsys_1_5v_voltage_now(int raw_val)
+{
+	/* Convert to uV */
+	return (((3 * ((raw_val * 1000) + 500)) / 2048) * 1000);
+}
+
+static inline int da9150_gpadc_tjunc_temp(int raw_val)
+{
+	/* Convert to 0.1 degrees C */
+	return (((879 - (1023 - raw_val)) * 10000) / 4420);
+}
+
+static inline int da9150_gpadc_vbat_voltage_now(int raw_val)
+{
+	/* Convert to uV */
+	return ((2932 * raw_val) + 1500000);
+}
+
+int da9150_gpadc_read_process(int channel, int raw_val)
+{
+	int ret;
+
+	switch (channel) {
+	case DA9150_GPADC_CHAN_GPIOA_2V:
+	case DA9150_GPADC_CHAN_GPIOA_2V_:
+	case DA9150_GPADC_CHAN_GPIOB_2V:
+	case DA9150_GPADC_CHAN_GPIOB_2V_:
+	case DA9150_GPADC_CHAN_GPIOC_2V:
+	case DA9150_GPADC_CHAN_GPIOC_2V_:
+	case DA9150_GPADC_CHAN_GPIOD_2V:
+	case DA9150_GPADC_CHAN_GPIOD_2V_:
+		ret = da9150_gpadc_gpio_2v_voltage_now(raw_val);
+		break;
+	case DA9150_GPADC_CHAN_IBUS_SENSE:
+	case DA9150_GPADC_CHAN_IBUS_SENSE_:
+		ret = da9150_gpadc_ibus_current_avg(raw_val);
+		break;
+	case DA9150_GPADC_CHAN_VBUS_DIV:
+		ret = da9150_gpadc_vbus_6v_voltage_now(raw_val);
+		break;
+	case DA9150_GPADC_CHAN_VBUS_DIV_:
+		ret = da9150_gpadc_vbus_21v_voltage_now(raw_val);
+		break;
+	case DA9150_GPADC_CHAN_VSYS:
+		ret = da9150_gpadc_vsys_6v_voltage_now(raw_val);
+		break;
+	case DA9150_GPADC_CHAN_VSYS_:
+		ret = da9150_gpadc_vsys_1_5v_voltage_now(raw_val);
+		break;
+	case DA9150_GPADC_CHAN_GPIOA_5V:
+	case DA9150_GPADC_CHAN_GPIOA_5V_:
+	case DA9150_GPADC_CHAN_GPIOB_5V:
+	case DA9150_GPADC_CHAN_GPIOB_5V_:
+	case DA9150_GPADC_CHAN_GPIOC_5V:
+	case DA9150_GPADC_CHAN_GPIOC_5V_:
+	case DA9150_GPADC_CHAN_GPIOD_5V:
+	case DA9150_GPADC_CHAN_GPIOD_5V_:
+		ret = da9150_gpadc_gpio_5v_voltage_now(raw_val);
+		break;
+	case DA9150_GPADC_CHAN_TJUNC_CORE:
+	case DA9150_GPADC_CHAN_TJUNC_CORE_:
+	case DA9150_GPADC_CHAN_TJUNC_OVP:
+	case DA9150_GPADC_CHAN_TJUNC_OVP_:
+		ret = da9150_gpadc_tjunc_temp(raw_val);
+		break;
+	case DA9150_GPADC_CHAN_VBAT:
+		ret = da9150_gpadc_vbat_voltage_now(raw_val);
+		break;
+	default:
+		/* No processing for other channels so return raw value */
+		ret = raw_val;
+		break;
+	}
+
+	return ret;
+}
+
+int da9150_gpadc_read_raw(struct iio_dev *indio_dev,
+			  struct iio_chan_spec const *chan,
+			  int *val, int *val2, long mask)
+{
+	struct da9150_gpadc *gpadc = iio_priv(indio_dev);
+	u8 reg = 0;
+	u8 result_regs[2];
+	u16 result;
+
+	if ((mask != IIO_CHAN_INFO_RAW) && (mask != IIO_CHAN_INFO_PROCESSED))
+		return -EINVAL;
+
+	if ((chan->channel < DA9150_GPADC_CHAN_GPIOA_2V) ||
+	    (chan->channel > DA9150_GPADC_CHAN_TJUNC_OVP_))
+		return -EINVAL;
+
+	mutex_lock(&gpadc->lock);
+
+	/* Set channel & enable measurement */
+	reg |= DA9150_GPADC_EN_MASK;
+	reg |= chan->channel << DA9150_GPADC_MUX_SHIFT;
+	da9150_reg_write(gpadc->da9150, DA9150_GPADC_MAN, reg);
+
+	/* Consume left-over completion from a previous timeout */
+	try_wait_for_completion(&gpadc->complete);
+
+	/* Check for actual completion */
+	wait_for_completion_timeout(&gpadc->complete, msecs_to_jiffies(5));
+
+	/* Read result and status from device */
+	da9150_bulk_read(gpadc->da9150, DA9150_GPADC_RES_A, 2, result_regs);
+
+	/* Check to make sure device really has completed reading */
+	if (result_regs[1] & DA9150_GPADC_RUN_MASK) {
+		mutex_unlock(&gpadc->lock);
+		dev_err(gpadc->dev, "Timeout on channel %d of GP-ADC\n",
+			chan->channel);
+		return -ETIMEDOUT;
+	}
+
+	mutex_unlock(&gpadc->lock);
+
+	/* LSBs - 2 bits */
+	result = (result_regs[1] & DA9150_GPADC_RES_L_MASK) >>
+		 DA9150_GPADC_RES_L_SHIFT;
+	/* MSBs - 8 bits */
+	result |= result_regs[0] << 2;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_PROCESSED:
+		*val = da9150_gpadc_read_process(chan->channel, result);
+		break;
+	case IIO_CHAN_INFO_RAW:
+		*val = result;
+		break;
+	}
+
+	return IIO_VAL_INT;
+}
+
+
+static const struct iio_info da9150_gpadc_info = {
+	.read_raw = &da9150_gpadc_read_raw,
+	.driver_module = THIS_MODULE,
+};
+
+#define GPADC_CHANNEL(_id, _type, chan_info, _ext_name) {		\
+	.type = _type,							\
+	.indexed = 1,							\
+	.channel = DA9150_GPADC_CHAN_##_id,				\
+	.info_mask_separate = chan_info,				\
+	.extend_name = _ext_name,					\
+	.datasheet_name = #_id,						\
+}
+
+#define GPADC_CHANNEL_RAW(_id, _type, _ext_name)	\
+	GPADC_CHANNEL(_id, _type, BIT(IIO_CHAN_INFO_RAW), _ext_name)
+
+#define GPADC_CHANNEL_RAW_PROCESSED(_id, _type, _ext_name)			\
+	GPADC_CHANNEL(_id, _type,						\
+		      BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),	\
+		      _ext_name)
+
+/* Supported channels */
+static const struct iio_chan_spec da9150_gpadc_channels[] = {
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOA_2V, IIO_VOLTAGE, "GPIOA_2V"),
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOA_2V_, IIO_VOLTAGE, "GPIOA_2V_"),
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOB_2V, IIO_VOLTAGE, "GPIOB_2V"),
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOB_2V_, IIO_VOLTAGE, "GPIOB_2V_"),
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOC_2V, IIO_VOLTAGE, "GPIOC_2V"),
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOC_2V_, IIO_VOLTAGE, "GPIOC_2V_"),
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOD_2V, IIO_VOLTAGE, "GPIOD_2V"),
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOD_2V_, IIO_VOLTAGE, "GPIOD_2V_"),
+	GPADC_CHANNEL_RAW_PROCESSED(IBUS_SENSE, IIO_CURRENT, "IBUS"),
+	GPADC_CHANNEL_RAW_PROCESSED(IBUS_SENSE_, IIO_CURRENT, "IBUS_"),
+	GPADC_CHANNEL_RAW_PROCESSED(VBUS_DIV, IIO_VOLTAGE, "VBUS_6V"),
+	GPADC_CHANNEL_RAW_PROCESSED(VBUS_DIV_, IIO_VOLTAGE, "VBUS_21V"),
+	GPADC_CHANNEL_RAW(ID, IIO_VOLTAGE, "ID"),
+	GPADC_CHANNEL_RAW(ID_, IIO_VOLTAGE, "ID_"),
+	GPADC_CHANNEL_RAW_PROCESSED(VSYS, IIO_VOLTAGE, "VSYS_6V"),
+	GPADC_CHANNEL_RAW_PROCESSED(VSYS_, IIO_VOLTAGE, "VSYS_1_5V"),
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOA_5V, IIO_VOLTAGE, "GPIOA_5V"),
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOA_5V_, IIO_VOLTAGE, "GPIOA_5V_"),
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOB_5V, IIO_VOLTAGE, "GPIOB_5V"),
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOB_5V_, IIO_VOLTAGE, "GPIOB_5V_"),
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOC_5V, IIO_VOLTAGE, "GPIOC_5V"),
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOC_5V_, IIO_VOLTAGE, "GPIOC_5V_"),
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOD_5V, IIO_VOLTAGE, "GPIOD_5V"),
+	GPADC_CHANNEL_RAW_PROCESSED(GPIOD_5V_, IIO_VOLTAGE, "GPIOD_5V_"),
+	GPADC_CHANNEL_RAW_PROCESSED(VBAT, IIO_VOLTAGE, "VBAT"),
+	GPADC_CHANNEL_RAW_PROCESSED(VBAT_, IIO_VOLTAGE, "VBAT_"),
+	GPADC_CHANNEL_RAW(TBAT, IIO_VOLTAGE, "TBAT"),
+	GPADC_CHANNEL_RAW(TBAT_, IIO_VOLTAGE, "TBAT_"),
+	GPADC_CHANNEL_RAW_PROCESSED(TJUNC_CORE, IIO_TEMP, "TJUNC_CORE"),
+	GPADC_CHANNEL_RAW_PROCESSED(TJUNC_CORE_, IIO_TEMP, "TJUNC_CORE_"),
+	GPADC_CHANNEL_RAW_PROCESSED(TJUNC_OVP, IIO_TEMP, "TJUNC_OVP"),
+	GPADC_CHANNEL_RAW_PROCESSED(TJUNC_OVP_, IIO_TEMP, "TJUNC_OVP_"),
+};
+
+/* Default maps used by da9150-charger */
+static struct iio_map da9150_gpadc_default_maps[] = {
+	{
+		.consumer_dev_name = "da9150-charger",
+		.consumer_channel = "CHAN_IBUS",
+		.adc_channel_label = "IBUS_SENSE",
+	},
+	{
+		.consumer_dev_name = "da9150-charger",
+		.consumer_channel = "CHAN_VBUS",
+		.adc_channel_label = "VBUS_DIV_",
+	},
+	{
+		.consumer_dev_name = "da9150-charger",
+		.consumer_channel = "CHAN_TJUNC",
+		.adc_channel_label = "TJUNC_CORE",
+	},
+	{
+		.consumer_dev_name = "da9150-charger",
+		.consumer_channel = "CHAN_VBAT",
+		.adc_channel_label = "VBAT",
+	},
+	{},
+};
+
+
+/*
+ * Driver top level functions
+ */
+
+static int da9150_gpadc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct da9150 *da9150 = dev_get_drvdata(dev->parent);
+	struct da9150_gpadc *gpadc;
+	struct iio_dev *indio_dev;
+
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&pdev->dev,
+					  sizeof(struct da9150_gpadc));
+	if (!indio_dev) {
+		dev_err(&pdev->dev, "Failed to allocate IIO device\n");
+		return -ENOMEM;
+	}
+	gpadc = iio_priv(indio_dev);
+
+	platform_set_drvdata(pdev, indio_dev);
+	gpadc->da9150 = da9150;
+	gpadc->dev = dev;
+
+	ret = iio_map_array_register(indio_dev, da9150_gpadc_default_maps);
+	if (ret) {
+		dev_err(dev, "Failed to register IIO maps: %d\n", ret);
+		goto iio_map_fail;
+	}
+
+	indio_dev->name = dev_name(dev);
+	indio_dev->dev.parent = dev;
+	indio_dev->dev.of_node = pdev->dev.of_node;
+	indio_dev->info = &da9150_gpadc_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = da9150_gpadc_channels;
+	indio_dev->num_channels = ARRAY_SIZE(da9150_gpadc_channels);
+
+	ret = iio_device_register(indio_dev);
+	if (ret) {
+		dev_err(dev, "Failed to register IIO device: %d\n", ret);
+		goto iio_dev_fail;
+	}
+
+	mutex_init(&gpadc->lock);
+	init_completion(&gpadc->complete);
+
+	/* Register IRQ */
+	ret = da9150_register_irq(pdev, gpadc, da9150_gpadc_irq, "GPADC");
+	if (ret < 0)
+		goto irq_fail;
+
+	da9150->gpadc_ready = true;
+	return ret;
+
+irq_fail:
+	iio_device_unregister(indio_dev);
+
+iio_dev_fail:
+	iio_map_array_unregister(indio_dev);
+
+iio_map_fail:
+	return ret;
+}
+
+static int da9150_gpadc_remove(struct platform_device *pdev)
+{
+	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+
+	iio_map_array_unregister(indio_dev);
+	iio_device_unregister(indio_dev);
+
+	return 0;
+}
+
+static struct platform_driver da9150_gpadc_driver = {
+	.driver = {
+		.name = "da9150-gpadc",
+		.owner = THIS_MODULE,
+	},
+	.probe = da9150_gpadc_probe,
+	.remove = da9150_gpadc_remove,
+};
+
+module_platform_driver(da9150_gpadc_driver);
+
+MODULE_DESCRIPTION("GPADC Driver for DA9150");
+MODULE_AUTHOR("Adam Thomson <Adam.Thomson.Opensource@...semi.com");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/da9150/gpadc.h b/include/linux/mfd/da9150/gpadc.h
new file mode 100644
index 0000000..3e46164
--- /dev/null
+++ b/include/linux/mfd/da9150/gpadc.h
@@ -0,0 +1,71 @@
+/*
+ * DA9150 GPADC Driver - GPADC Data
+ *
+ * Copyright (c) 2014 Dialog Semiconductor
+ *
+ * Author: Adam Thomson <Adam.Thomson.Opensource@...semi.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;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#ifndef _DA9150_GPADC_H
+#define _DA9150_GPADC_H
+
+#include <linux/device.h>
+#include <linux/iio/machine.h>
+#include <linux/mutex.h>
+#include <linux/completion.h>
+
+#include <linux/mfd/da9150/core.h>
+
+
+/* Channels */
+enum da9150_gpadc_channel {
+	DA9150_GPADC_CHAN_GPIOA_2V = 0,
+	DA9150_GPADC_CHAN_GPIOA_2V_,
+	DA9150_GPADC_CHAN_GPIOB_2V,
+	DA9150_GPADC_CHAN_GPIOB_2V_,
+	DA9150_GPADC_CHAN_GPIOC_2V,
+	DA9150_GPADC_CHAN_GPIOC_2V_,
+	DA9150_GPADC_CHAN_GPIOD_2V,
+	DA9150_GPADC_CHAN_GPIOD_2V_,
+	DA9150_GPADC_CHAN_IBUS_SENSE,
+	DA9150_GPADC_CHAN_IBUS_SENSE_,
+	DA9150_GPADC_CHAN_VBUS_DIV,
+	DA9150_GPADC_CHAN_VBUS_DIV_,
+	DA9150_GPADC_CHAN_ID,
+	DA9150_GPADC_CHAN_ID_,
+	DA9150_GPADC_CHAN_VSYS,
+	DA9150_GPADC_CHAN_VSYS_,
+	DA9150_GPADC_CHAN_GPIOA_5V,
+	DA9150_GPADC_CHAN_GPIOA_5V_,
+	DA9150_GPADC_CHAN_GPIOB_5V,
+	DA9150_GPADC_CHAN_GPIOB_5V_,
+	DA9150_GPADC_CHAN_GPIOC_5V,
+	DA9150_GPADC_CHAN_GPIOC_5V_,
+	DA9150_GPADC_CHAN_GPIOD_5V,
+	DA9150_GPADC_CHAN_GPIOD_5V_,
+	DA9150_GPADC_CHAN_VBAT,
+	DA9150_GPADC_CHAN_VBAT_,
+	DA9150_GPADC_CHAN_TBAT,
+	DA9150_GPADC_CHAN_TBAT_,
+	DA9150_GPADC_CHAN_TJUNC_CORE,
+	DA9150_GPADC_CHAN_TJUNC_CORE_,
+	DA9150_GPADC_CHAN_TJUNC_OVP,
+	DA9150_GPADC_CHAN_TJUNC_OVP_,
+};
+
+
+/* Private data */
+struct da9150_gpadc {
+	struct da9150 *da9150;
+	struct device *dev;
+
+	struct mutex lock;
+	struct completion complete;
+};
+
+#endif /* _DA9150_GPADC_H */
--
1.9.3

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