[PATCH v3 5/5] staging:iio:hmc5843: Add support for spi hmc5983

[Josef Gajdusek <atx@atalax.net>]

This patch adds support for the hmc5983 spi interface.
This chip is almost identical to the hmc5883. The difference being added
temperature compensation, additional available sample rate (220Hz) and an SPI
interface.

Signed-off-by: Josef Gajdusek <atx@atx.name>
---
 drivers/staging/iio/magnetometer/Kconfig       |   8 ++
 drivers/staging/iio/magnetometer/Makefile      |   1 +
 drivers/staging/iio/magnetometer/hmc5843_spi.c | 105 +++++++++++++++++++++++++
 3 files changed, 114 insertions(+)
 create mode 100644 drivers/staging/iio/magnetometer/hmc5843_spi.c

diff --git a/drivers/staging/iio/magnetometer/Kconfig b/drivers/staging/iio/magnetometer/Kconfig
index 32c69c0..bc5c355 100644
--- a/drivers/staging/iio/magnetometer/Kconfig
+++ b/drivers/staging/iio/magnetometer/Kconfig
@@ -9,6 +9,7 @@ config SENSORS_HMC5843
 	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
 	select SENSORS_HMC5843_I2C if (I2C)
+	select SENSORS_HMC5843_SPI if (SPI_MASTER)
 	help
 	  Say Y here to add support for the Honeywell HMC5843, HMC5883 and
 	  HMC5883L 3-Axis Magnetometer (digital compass).
@@ -17,6 +18,7 @@ config SENSORS_HMC5843
 	  If so, these modules will be created:
 	  - hmc5843_core (core functions)
 	  - hmc5843_i2c (support for HMC5843, HMC5883, HMC5883L and HMC5983)
+	  - hmc5843_spi (support for HMC5983)
 
 config SENSORS_HMC5843_I2C
 	tristate
@@ -24,4 +26,10 @@ config SENSORS_HMC5843_I2C
 	depends on SENSORS_HMC5843
 	select REGMAP_I2C
 
+config SENSORS_HMC5843_SPI
+	tristate
+	depends on SPI_MASTER
+	depends on SENSORS_HMC5843
+	select REGMAP_SPI
+
 endmenu
diff --git a/drivers/staging/iio/magnetometer/Makefile b/drivers/staging/iio/magnetometer/Makefile
index 65baf1c..33761a1 100644
--- a/drivers/staging/iio/magnetometer/Makefile
+++ b/drivers/staging/iio/magnetometer/Makefile
@@ -4,3 +4,4 @@
 
 obj-$(CONFIG_SENSORS_HMC5843)		+= hmc5843_core.o
 obj-$(CONFIG_SENSORS_HMC5843_I2C)	+= hmc5843_i2c.o
+obj-$(CONFIG_SENSORS_HMC5843_SPI)	+= hmc5843_spi.o
diff --git a/drivers/staging/iio/magnetometer/hmc5843_spi.c b/drivers/staging/iio/magnetometer/hmc5843_spi.c
new file mode 100644
index 0000000..3f71ee0
--- /dev/null
+++ b/drivers/staging/iio/magnetometer/hmc5843_spi.c
@@ -0,0 +1,105 @@
+/*
+ * SPI driver for hmc5983
+ *
+ * Copyright (C) Josef Gajdusek <atx@atx.name>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * */
+
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/iio/iio.h>
+
+#include "hmc5843.h"
+
+struct regmap_config hmc5843_spi_regmap_config = {
+		.reg_bits = 8,
+		.val_bits = 8,
+
+		.rd_table = &hmc5843_readable_table,
+		.wr_table = &hmc5843_writable_table,
+		.volatile_table = &hmc5843_volatile_table,
+
+		/* Autoincrement address pointer */
+		.read_flag_mask = 0xc0,
+
+		.cache_type = REGCACHE_RBTREE,
+};
+
+static int hmc5843_spi_probe(struct spi_device *spi)
+{
+	struct hmc5843_data *data;
+	struct iio_dev *indio_dev;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));
+	if (indio_dev == NULL)
+		return -ENOMEM;
+
+	spi->mode = SPI_MODE_3;
+	spi->max_speed_hz = 8000000;
+	spi->bits_per_word = 8;
+	ret = spi_setup(spi);
+	if (ret)
+		return ret;
+
+	spi_set_drvdata(spi, indio_dev);
+
+	data = iio_priv(indio_dev);
+	data->dev = &spi->dev;
+	data->regmap = devm_regmap_init_spi(spi, &hmc5843_spi_regmap_config);
+
+	indio_dev->dev.parent = &spi->dev;
+
+	return hmc5843_common_probe(indio_dev, HMC5983_ID);
+}
+
+static int hmc5843_spi_remove(struct spi_device *spi)
+{
+	struct iio_dev *indio_dev = spi_get_drvdata(spi);
+	return hmc5843_common_remove(indio_dev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int hmc5843_spi_suspend(struct device *dev)
+{
+	return hmc5843_common_suspend(spi_get_drvdata(to_spi_device(dev)));
+}
+
+static int hmc5843_spi_resume(struct device *dev)
+{
+	return hmc5843_common_resume(spi_get_drvdata(to_spi_device(dev)));
+}
+
+static SIMPLE_DEV_PM_OPS(hmc5843_pm_ops,
+		hmc5843_spi_suspend, hmc5843_spi_resume);
+#define HMC5843_PM_OPS (&hmc5843_pm_ops)
+#else
+#define HMC5843_PM_OPS NULL
+#endif
+
+
+static const struct spi_device_id hmc5843_id[] = {
+	{ "hmc5983", HMC5983_ID },
+	{ }
+};
+
+static struct spi_driver hmc5843_driver = {
+		.driver = {
+				.name = "hmc5843",
+				.pm = HMC5843_PM_OPS,
+				.owner = THIS_MODULE,
+		},
+		.id_table = hmc5843_id,
+		.probe = hmc5843_spi_probe,
+		.remove = hmc5843_spi_remove,
+};
+
+module_spi_driver(hmc5843_driver);
+
+MODULE_AUTHOR("Josef Gajdusek <atx@atx.name>");
+MODULE_DESCRIPTION("HMC5983 SPI driver");
+MODULE_LICENSE("GPL");
-- 
1.8.5.5