1 files changed, 117 insertions, 0 deletions
diff --git a/drivers/iio/pressure/bmp280-spi.c b/drivers/iio/pressure/bmp280-spi.c
new file mode 100644
index 0000000000..1dff9bb7c4
--- /dev/null
+++ b/drivers/iio/pressure/bmp280-spi.c
@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * SPI interface for the BMP280 driver
+ *
+ * Inspired by the older BMP085 driver drivers/misc/bmp085-spi.c
+ */
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/err.h>
+#include <linux/regmap.h>
+
+#include "bmp280.h"
+
+static int bmp280_regmap_spi_write(void *context, const void *data,
+                                   size_t count)
+{
+	struct device *dev = context;
+	struct spi_device *spi = to_spi_device(dev);
+	u8 buf[2];
+
+	memcpy(buf, data, 2);
+	/*
+	 * The SPI register address (= full register address without bit 7) and
+	 * the write command (bit7 = RW = '0')
+	 */
+	buf[0] &= ~0x80;
+
+	return spi_write_then_read(spi, buf, 2, NULL, 0);
+}
+
+static int bmp280_regmap_spi_read(void *context, const void *reg,
+                                  size_t reg_size, void *val, size_t val_size)
+{
+	struct device *dev = context;
+	struct spi_device *spi = to_spi_device(dev);
+
+	return spi_write_then_read(spi, reg, reg_size, val, val_size);
+}
+
+static struct regmap_bus bmp280_regmap_bus = {
+	.write = bmp280_regmap_spi_write,
+	.read = bmp280_regmap_spi_read,
+	.reg_format_endian_default = REGMAP_ENDIAN_BIG,
+	.val_format_endian_default = REGMAP_ENDIAN_BIG,
+};
+
+static int bmp280_spi_probe(struct spi_device *spi)
+{
+	const struct spi_device_id *id = spi_get_device_id(spi);
+	const struct bmp280_chip_info *chip_info;
+	struct regmap *regmap;
+	int ret;
+
+	spi->bits_per_word = 8;
+	ret = spi_setup(spi);
+	if (ret < 0) {
+		dev_err(&spi->dev, "spi_setup failed!\n");
+		return ret;
+	}
+
+	chip_info = device_get_match_data(&spi->dev);
+	if (!chip_info)
+		chip_info = (const struct bmp280_chip_info *) id->driver_data;
+
+	regmap = devm_regmap_init(&spi->dev,
+				  &bmp280_regmap_bus,
+				  &spi->dev,
+				  chip_info->regmap_config);
+	if (IS_ERR(regmap)) {
+		dev_err(&spi->dev, "failed to allocate register map\n");
+		return PTR_ERR(regmap);
+	}
+
+	return bmp280_common_probe(&spi->dev,
+				   regmap,
+				   chip_info,
+				   id->name,
+				   spi->irq);
+}
+
+static const struct of_device_id bmp280_of_spi_match[] = {
+	{ .compatible = "bosch,bmp085", .data = &bmp180_chip_info },
+	{ .compatible = "bosch,bmp180", .data = &bmp180_chip_info },
+	{ .compatible = "bosch,bmp181", .data = &bmp180_chip_info },
+	{ .compatible = "bosch,bmp280", .data = &bmp280_chip_info },
+	{ .compatible = "bosch,bme280", .data = &bmp280_chip_info },
+	{ .compatible = "bosch,bmp380", .data = &bmp380_chip_info },
+	{ .compatible = "bosch,bmp580", .data = &bmp580_chip_info },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, bmp280_of_spi_match);
+
+static const struct spi_device_id bmp280_spi_id[] = {
+	{ "bmp180", (kernel_ulong_t)&bmp180_chip_info },
+	{ "bmp181", (kernel_ulong_t)&bmp180_chip_info },
+	{ "bmp280", (kernel_ulong_t)&bmp280_chip_info },
+	{ "bme280", (kernel_ulong_t)&bmp280_chip_info },
+	{ "bmp380", (kernel_ulong_t)&bmp380_chip_info },
+	{ "bmp580", (kernel_ulong_t)&bmp580_chip_info },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, bmp280_spi_id);
+
+static struct spi_driver bmp280_spi_driver = {
+	.driver = {
+		.name = "bmp280",
+		.of_match_table = bmp280_of_spi_match,
+		.pm = pm_ptr(&bmp280_dev_pm_ops),
+	},
+	.id_table = bmp280_spi_id,
+	.probe = bmp280_spi_probe,
+};
+module_spi_driver(bmp280_spi_driver);
+
+MODULE_DESCRIPTION("BMP280 SPI bus driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(IIO_BMP280);