iio: magn: bmc150: Introduce SPI support

Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/magnetometer/Kconfig

@@ -47,6 +47,22 @@ config BMC150_MAGN_I2C
 	  To compile this driver as a module, choose M here: the module will be
 	  called bmc150_magn_i2c.
 
+config BMC150_MAGN_SPI
+	tristate "Bosch BMC150 SPI Magnetometer Driver"
+	depends on SPI
+	select BMC150_MAGN
+	select REGMAP_SPI
+	help
+	  Say yes here to build support for the BMC150 magnetometer with
+	  SPI interface.
+
+	  This is a combo module with both accelerometer and magnetometer.
+	  This driver is only implementing magnetometer part, which has
+	  its own address and register map.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called bmc150_magn_spi.
+
 config MAG3110
 	tristate "Freescale MAG3110 3-Axis Magnetometer"
 	depends on I2C

drivers/iio/magnetometer/Makefile

@@ -6,6 +6,7 @@
 obj-$(CONFIG_AK8975)	+= ak8975.o
 obj-$(CONFIG_BMC150_MAGN) += bmc150_magn.o
 obj-$(CONFIG_BMC150_MAGN_I2C) += bmc150_magn_i2c.o
+obj-$(CONFIG_BMC150_MAGN_SPI) += bmc150_magn_spi.o
 
 obj-$(CONFIG_MAG3110)	+= mag3110.o
 obj-$(CONFIG_HID_SENSOR_MAGNETOMETER_3D) += hid-sensor-magn-3d.o

drivers/iio/magnetometer/bmc150_magn_spi.c

@@ -0,0 +1,68 @@
+/*
+ * 3-axis magnetometer driver support following SPI Bosch-Sensortec chips:
+ *  - BMC150
+ *  - BMC156
+ *
+ * Copyright (c) 2016, Intel Corporation.
+ *
+ * This file is subject to the terms and conditions of version 2 of
+ * the GNU General Public License.  See the file COPYING in the main
+ * directory of this archive for more details.
+ */
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/spi/spi.h>
+#include <linux/acpi.h>
+#include <linux/regmap.h>
+
+#include "bmc150_magn.h"
+
+static int bmc150_magn_spi_probe(struct spi_device *spi)
+{
+	struct regmap *regmap;
+	const struct spi_device_id *id = spi_get_device_id(spi);
+
+	regmap = devm_regmap_init_spi(spi, &bmc150_magn_regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(&spi->dev, "Failed to register spi regmap %d\n",
+			(int)PTR_ERR(regmap));
+		return PTR_ERR(regmap);
+	}
+	return bmc150_magn_probe(&spi->dev, regmap, spi->irq, id->name);
+}
+
+static int bmc150_magn_spi_remove(struct spi_device *spi)
+{
+	bmc150_magn_remove(&spi->dev);
+
+	return 0;
+}
+
+static const struct spi_device_id bmc150_magn_spi_id[] = {
+	{"bmc150_magn", 0},
+	{"bmc156_magn", 0},
+	{}
+};
+MODULE_DEVICE_TABLE(spi, bmc150_magn_spi_id);
+
+static const struct acpi_device_id bmc150_magn_acpi_match[] = {
+	{"BMC150B", 0},
+	{"BMC156B", 0},
+	{},
+};
+MODULE_DEVICE_TABLE(acpi, bmc150_magn_acpi_match);
+
+static struct spi_driver bmc150_magn_spi_driver = {
+	.probe		= bmc150_magn_spi_probe,
+	.remove		= bmc150_magn_spi_remove,
+	.id_table	= bmc150_magn_spi_id,
+	.driver = {
+		.acpi_match_table = ACPI_PTR(bmc150_magn_acpi_match),
+		.name	= "bmc150_magn_spi",
+	},
+};
+module_spi_driver(bmc150_magn_spi_driver);
+
+MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com");
+MODULE_DESCRIPTION("BMC150 magnetometer SPI driver");
+MODULE_LICENSE("GPL v2");