Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 241 insertions, 0 deletions

diff --git a/kernel/drivers/iio/gyro/adis16080.c b/kernel/drivers/iio/gyro/adis16080.c
new file mode 100644
index 000000000..add509837
--- /dev/null
+++ b/kernel/drivers/iio/gyro/adis16080.c
@@ -0,0 +1,241 @@
+/*
+ * ADIS16080/100 Yaw Rate Gyroscope with SPI driver
+ *
+ * Copyright 2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/spi/spi.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/module.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define ADIS16080_DIN_GYRO   (0 << 10) /* Gyroscope output */
+#define ADIS16080_DIN_TEMP   (1 << 10) /* Temperature output */
+#define ADIS16080_DIN_AIN1   (2 << 10)
+#define ADIS16080_DIN_AIN2   (3 << 10)
+
+/*
+ * 1: Write contents on DIN to control register.
+ * 0: No changes to control register.
+ */
+
+#define ADIS16080_DIN_WRITE  (1 << 15)
+
+struct adis16080_chip_info {
+	int scale_val;
+	int scale_val2;
+};
+
+/**
+ * struct adis16080_state - device instance specific data
+ * @us:			actual spi_device to write data
+ * @info:		chip specific parameters
+ * @buf:		transmit or receive buffer
+ **/
+struct adis16080_state {
+	struct spi_device		*us;
+	const struct adis16080_chip_info *info;
+
+	__be16 buf ____cacheline_aligned;
+};
+
+static int adis16080_read_sample(struct iio_dev *indio_dev,
+		u16 addr, int *val)
+{
+	struct adis16080_state *st = iio_priv(indio_dev);
+	int ret;
+	struct spi_transfer	t[] = {
+		{
+			.tx_buf		= &st->buf,
+			.len		= 2,
+			.cs_change	= 1,
+		}, {
+			.rx_buf		= &st->buf,
+			.len		= 2,
+		},
+	};
+
+	st->buf = cpu_to_be16(addr | ADIS16080_DIN_WRITE);
+
+	ret = spi_sync_transfer(st->us, t, ARRAY_SIZE(t));
+	if (ret == 0)
+		*val = sign_extend32(be16_to_cpu(st->buf), 11);
+
+	return ret;
+}
+
+static int adis16080_read_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int *val,
+			     int *val2,
+			     long mask)
+{
+	struct adis16080_state *st = iio_priv(indio_dev);
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		mutex_lock(&indio_dev->mlock);
+		ret = adis16080_read_sample(indio_dev, chan->address, val);
+		mutex_unlock(&indio_dev->mlock);
+		return ret ? ret : IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->type) {
+		case IIO_ANGL_VEL:
+			*val = st->info->scale_val;
+			*val2 = st->info->scale_val2;
+			return IIO_VAL_FRACTIONAL;
+		case IIO_VOLTAGE:
+			/* VREF = 5V, 12 bits */
+			*val = 5000;
+			*val2 = 12;
+			return IIO_VAL_FRACTIONAL_LOG2;
+		case IIO_TEMP:
+			/* 85 C = 585, 25 C = 0 */
+			*val = 85000 - 25000;
+			*val2 = 585;
+			return IIO_VAL_FRACTIONAL;
+		default:
+			return -EINVAL;
+		}
+	case IIO_CHAN_INFO_OFFSET:
+		switch (chan->type) {
+		case IIO_VOLTAGE:
+			/* 2.5 V = 0 */
+			*val = 2048;
+			return IIO_VAL_INT;
+		case IIO_TEMP:
+			/* 85 C = 585, 25 C = 0 */
+			*val = DIV_ROUND_CLOSEST(25 * 585, 85 - 25);
+			return IIO_VAL_INT;
+		default:
+			return -EINVAL;
+		}
+	default:
+		break;
+	}
+
+	return -EINVAL;
+}
+
+static const struct iio_chan_spec adis16080_channels[] = {
+	{
+		.type = IIO_ANGL_VEL,
+		.modified = 1,
+		.channel2 = IIO_MOD_Z,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+			BIT(IIO_CHAN_INFO_SCALE),
+		.address = ADIS16080_DIN_GYRO,
+	}, {
+		.type = IIO_VOLTAGE,
+		.indexed = 1,
+		.channel = 0,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+			BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_OFFSET),
+		.address = ADIS16080_DIN_AIN1,
+	}, {
+		.type = IIO_VOLTAGE,
+		.indexed = 1,
+		.channel = 1,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+			BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_OFFSET),
+		.address = ADIS16080_DIN_AIN2,
+	}, {
+		.type = IIO_TEMP,
+		.indexed = 1,
+		.channel = 0,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+			BIT(IIO_CHAN_INFO_SCALE) |
+			BIT(IIO_CHAN_INFO_OFFSET),
+		.address = ADIS16080_DIN_TEMP,
+	}
+};
+
+static const struct iio_info adis16080_info = {
+	.read_raw = &adis16080_read_raw,
+	.driver_module = THIS_MODULE,
+};
+
+enum {
+	ID_ADIS16080,
+	ID_ADIS16100,
+};
+
+static const struct adis16080_chip_info adis16080_chip_info[] = {
+	[ID_ADIS16080] = {
+		/* 80 degree = 819, 819 rad = 46925 degree */
+		.scale_val = 80,
+		.scale_val2 = 46925,
+	},
+	[ID_ADIS16100] = {
+		/* 300 degree = 1230, 1230 rad = 70474 degree */
+		.scale_val = 300,
+		.scale_val2 = 70474,
+	},
+};
+
+static int adis16080_probe(struct spi_device *spi)
+{
+	const struct spi_device_id *id = spi_get_device_id(spi);
+	struct adis16080_state *st;
+	struct iio_dev *indio_dev;
+
+	/* setup the industrialio driver allocated elements */
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
+	if (!indio_dev)
+		return -ENOMEM;
+	st = iio_priv(indio_dev);
+	/* this is only used for removal purposes */
+	spi_set_drvdata(spi, indio_dev);
+
+	/* Allocate the comms buffers */
+	st->us = spi;
+	st->info = &adis16080_chip_info[id->driver_data];
+
+	indio_dev->name = spi->dev.driver->name;
+	indio_dev->channels = adis16080_channels;
+	indio_dev->num_channels = ARRAY_SIZE(adis16080_channels);
+	indio_dev->dev.parent = &spi->dev;
+	indio_dev->info = &adis16080_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	return iio_device_register(indio_dev);
+}
+
+static int adis16080_remove(struct spi_device *spi)
+{
+	iio_device_unregister(spi_get_drvdata(spi));
+	return 0;
+}
+
+static const struct spi_device_id adis16080_ids[] = {
+	{ "adis16080", ID_ADIS16080 },
+	{ "adis16100", ID_ADIS16100 },
+	{},
+};
+MODULE_DEVICE_TABLE(spi, adis16080_ids);
+
+static struct spi_driver adis16080_driver = {
+	.driver = {
+		.name = "adis16080",
+		.owner = THIS_MODULE,
+	},
+	.probe = adis16080_probe,
+	.remove = adis16080_remove,
+	.id_table = adis16080_ids,
+};
+module_spi_driver(adis16080_driver);
+
+MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
+MODULE_DESCRIPTION("Analog Devices ADIS16080/100 Yaw Rate Gyroscope Driver");
+MODULE_LICENSE("GPL v2");