iio: bmc150: Add SPI driver

Add a simple SPI driver which initializes the spi regmap for the bmc150
core driver.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/accel/Kconfig

@@ -23,6 +23,7 @@ config BMC150_ACCEL
 	select IIO_TRIGGERED_BUFFER
 	select REGMAP
 	select BMC150_ACCEL_I2C if I2C
+	select BMC150_ACCEL_SPI if SPI
 	help
 	  Say yes here to build support for the following Bosch accelerometers:
 	  BMC150, BMI055, BMA250E, BMA222E, BMA255, BMA280.
@@ -35,6 +36,10 @@ config BMC150_ACCEL_I2C
 	tristate
 	select REGMAP_I2C
 
+config BMC150_ACCEL_SPI
+	tristate
+	select REGMAP_SPI
+
 config HID_SENSOR_ACCEL_3D
 	depends on HID_SENSOR_HUB
 	select IIO_BUFFER

drivers/iio/accel/Makefile

@@ -6,6 +6,7 @@
 obj-$(CONFIG_BMA180) += bma180.o
 obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o
 obj-$(CONFIG_BMC150_ACCEL_I2C) += bmc150-accel-i2c.o
+obj-$(CONFIG_BMC150_ACCEL_SPI) += bmc150-accel-spi.o
 obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
 obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
 obj-$(CONFIG_KXSD9)	+= kxsd9.o

drivers/iio/accel/bmc150-accel-spi.c

@@ -0,0 +1,91 @@
+/*
+ * 3-axis accelerometer driver supporting SPI Bosch-Sensortec accelerometer chip
+ * Copyright © 2015 Pengutronix, Markus Pargmann <mpa@pengutronix.de>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/device.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include "bmc150-accel.h"
+
+static const struct regmap_config bmc150_spi_regmap_conf = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0x3f,
+};
+
+static int bmc150_accel_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_spi_regmap_conf);
+	if (IS_ERR(regmap)) {
+		dev_err(&spi->dev, "Failed to initialize spi regmap\n");
+		return PTR_ERR(regmap);
+	}
+
+	return bmc150_accel_core_probe(&spi->dev, regmap, spi->irq, id->name,
+				       true);
+}
+
+static int bmc150_accel_remove(struct spi_device *spi)
+{
+	return bmc150_accel_core_remove(&spi->dev);
+}
+
+static const struct acpi_device_id bmc150_accel_acpi_match[] = {
+	{"BSBA0150",	bmc150},
+	{"BMC150A",	bmc150},
+	{"BMI055A",	bmi055},
+	{"BMA0255",	bma255},
+	{"BMA250E",	bma250e},
+	{"BMA222E",	bma222e},
+	{"BMA0280",	bma280},
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, bmc150_accel_acpi_match);
+
+static const struct spi_device_id bmc150_accel_id[] = {
+	{"bmc150_accel",	bmc150},
+	{"bmi055_accel",	bmi055},
+	{"bma255",		bma255},
+	{"bma250e",		bma250e},
+	{"bma222e",		bma222e},
+	{"bma280",		bma280},
+	{}
+};
+MODULE_DEVICE_TABLE(spi, bmc150_accel_id);
+
+static struct spi_driver bmc150_accel_driver = {
+	.driver = {
+		.name	= "bmc150_accel_spi",
+		.acpi_match_table = ACPI_PTR(bmc150_accel_acpi_match),
+		.pm	= &bmc150_accel_pm_ops,
+	},
+	.probe		= bmc150_accel_probe,
+	.remove		= bmc150_accel_remove,
+	.id_table	= bmc150_accel_id,
+};
+module_spi_driver(bmc150_accel_driver);
+
+MODULE_AUTHOR("Markus Pargmann <mpa@pengutronix.de>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("BMC150 SPI accelerometer driver");