v4.19.13 snapshot.
diff --git a/drivers/iio/chemical/bme680_spi.c b/drivers/iio/chemical/bme680_spi.c
new file mode 100644
index 0000000..c9fb05e
--- /dev/null
+++ b/drivers/iio/chemical/bme680_spi.c
@@ -0,0 +1,125 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * BME680 - SPI Driver
+ *
+ * Copyright (C) 2018 Himanshu Jha <himanshujha199640@gmail.com>
+ */
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include "bme680.h"
+
+static int bme680_regmap_spi_write(void *context, const void *data,
+ size_t count)
+{
+ struct spi_device *spi = context;
+ 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 bme680_regmap_spi_read(void *context, const void *reg,
+ size_t reg_size, void *val, size_t val_size)
+{
+ struct spi_device *spi = context;
+
+ return spi_write_then_read(spi, reg, reg_size, val, val_size);
+}
+
+static struct regmap_bus bme680_regmap_bus = {
+ .write = bme680_regmap_spi_write,
+ .read = bme680_regmap_spi_read,
+ .reg_format_endian_default = REGMAP_ENDIAN_BIG,
+ .val_format_endian_default = REGMAP_ENDIAN_BIG,
+};
+
+static int bme680_spi_probe(struct spi_device *spi)
+{
+ const struct spi_device_id *id = spi_get_device_id(spi);
+ struct regmap *regmap;
+ unsigned int val;
+ int ret;
+
+ spi->bits_per_word = 8;
+ ret = spi_setup(spi);
+ if (ret < 0) {
+ dev_err(&spi->dev, "spi_setup failed!\n");
+ return ret;
+ }
+
+ regmap = devm_regmap_init(&spi->dev, &bme680_regmap_bus,
+ &spi->dev, &bme680_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);
+ }
+
+ ret = regmap_write(regmap, BME680_REG_SOFT_RESET_SPI,
+ BME680_CMD_SOFTRESET);
+ if (ret < 0) {
+ dev_err(&spi->dev, "Failed to reset chip\n");
+ return ret;
+ }
+
+ /* after power-on reset, Page 0(0x80-0xFF) of spi_mem_page is active */
+ ret = regmap_read(regmap, BME680_REG_CHIP_SPI_ID, &val);
+ if (ret < 0) {
+ dev_err(&spi->dev, "Error reading SPI chip ID\n");
+ return ret;
+ }
+
+ if (val != BME680_CHIP_ID_VAL) {
+ dev_err(&spi->dev, "Wrong chip ID, got %x expected %x\n",
+ val, BME680_CHIP_ID_VAL);
+ return -ENODEV;
+ }
+ /*
+ * select Page 1 of spi_mem_page to enable access to
+ * to registers from address 0x00 to 0x7F.
+ */
+ ret = regmap_write_bits(regmap, BME680_REG_STATUS,
+ BME680_SPI_MEM_PAGE_BIT,
+ BME680_SPI_MEM_PAGE_1_VAL);
+ if (ret < 0) {
+ dev_err(&spi->dev, "failed to set page 1 of spi_mem_page\n");
+ return ret;
+ }
+
+ return bme680_core_probe(&spi->dev, regmap, id->name);
+}
+
+static const struct spi_device_id bme680_spi_id[] = {
+ {"bme680", 0},
+ {},
+};
+MODULE_DEVICE_TABLE(spi, bme680_spi_id);
+
+static const struct acpi_device_id bme680_acpi_match[] = {
+ {"BME0680", 0},
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, bme680_acpi_match);
+
+static struct spi_driver bme680_spi_driver = {
+ .driver = {
+ .name = "bme680_spi",
+ .acpi_match_table = ACPI_PTR(bme680_acpi_match),
+ },
+ .probe = bme680_spi_probe,
+ .id_table = bme680_spi_id,
+};
+module_spi_driver(bme680_spi_driver);
+
+MODULE_AUTHOR("Himanshu Jha <himanshujha199640@gmail.com>");
+MODULE_DESCRIPTION("Bosch BME680 SPI driver");
+MODULE_LICENSE("GPL v2");