1 files changed, 89 insertions, 0 deletions
diff --git a/drivers/iio/chemical/bme680.h b/drivers/iio/chemical/bme680.h
new file mode 100644
index 000000000000..7d86ed8b02e6
--- /dev/null
+++ b/drivers/iio/chemical/bme680.h
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef BME680_H_
+#define BME680_H_
+
+#include <linux/pm.h>
+#include <linux/regmap.h>
+
+#define BME680_REG_CHIP_ID			0xD0
+#define   BME680_CHIP_ID_VAL			0x61
+#define BME680_REG_SOFT_RESET			0xE0
+#define   BME680_CMD_SOFTRESET			0xB6
+#define BME680_REG_STATUS			0x73
+#define   BME680_SPI_MEM_PAGE_BIT		BIT(4)
+#define     BME680_SPI_MEM_PAGE_1_VAL		1
+
+#define BME680_REG_TEMP_MSB			0x22
+#define BME680_REG_PRESS_MSB			0x1F
+#define BME680_REG_HUMIDITY_MSB			0x25
+#define BME680_REG_GAS_MSB			0x2A
+#define BME680_REG_GAS_R_LSB			0x2B
+#define   BME680_GAS_STAB_BIT			BIT(4)
+#define   BME680_GAS_RANGE_MASK			GENMASK(3, 0)
+
+#define BME680_REG_CTRL_HUMIDITY		0x72
+#define   BME680_OSRS_HUMIDITY_MASK		GENMASK(2, 0)
+
+#define BME680_REG_CTRL_MEAS			0x74
+#define   BME680_OSRS_TEMP_MASK			GENMASK(7, 5)
+#define   BME680_OSRS_PRESS_MASK		GENMASK(4, 2)
+#define   BME680_MODE_MASK			GENMASK(1, 0)
+
+#define BME680_REG_CONFIG			0x75
+#define   BME680_FILTER_MASK			GENMASK(4, 2)
+#define     BME680_FILTER_COEFF_VAL		BIT(1)
+
+/* TEMP/PRESS/HUMID reading skipped */
+#define BME680_MEAS_SKIPPED			0x8000
+
+#define BME680_MAX_OVERFLOW_VAL			0x40000000
+#define BME680_HUM_REG_SHIFT_VAL		4
+#define BME680_BIT_H1_DATA_MASK			GENMASK(3, 0)
+
+#define   BME680_RHRANGE_MASK			GENMASK(5, 4)
+#define BME680_REG_RES_HEAT_VAL			0x00
+#define   BME680_RSERROR_MASK			GENMASK(7, 4)
+#define BME680_REG_IDAC_HEAT_0			0x50
+#define BME680_REG_RES_HEAT_0			0x5A
+#define BME680_REG_GAS_WAIT_0			0x64
+#define BME680_ADC_GAS_RES			GENMASK(15, 6)
+#define BME680_AMB_TEMP				25
+
+#define BME680_REG_CTRL_GAS_1			0x71
+#define   BME680_RUN_GAS_MASK			BIT(4)
+#define   BME680_NB_CONV_MASK			GENMASK(3, 0)
+
+#define BME680_REG_MEAS_STAT_0			0x1D
+#define   BME680_NEW_DATA_BIT			BIT(7)
+#define   BME680_GAS_MEAS_BIT			BIT(6)
+#define   BME680_MEAS_BIT			BIT(5)
+
+#define BME680_TEMP_NUM_BYTES			3
+#define BME680_PRESS_NUM_BYTES			3
+#define BME680_HUMID_NUM_BYTES			2
+#define BME680_GAS_NUM_BYTES			2
+
+#define BME680_MEAS_TRIM_MASK			GENMASK(24, 4)
+
+/* Datasheet Section 1.1, Table 1 */
+#define BME680_STARTUP_TIME_US			2000
+
+#define BME680_NUM_CHANNELS			4
+#define BME680_NUM_BULK_READ_REGS		15
+
+/* Calibration Parameters */
+#define BME680_T2_LSB_REG	0x8A
+#define BME680_H2_MSB_REG	0xE1
+#define BME680_GH3_REG		0xEE
+
+#define BME680_CALIB_RANGE_1_LEN               23
+#define BME680_CALIB_RANGE_2_LEN               14
+#define BME680_CALIB_RANGE_3_LEN               5
+
+extern const struct regmap_config bme680_regmap_config;
+extern const struct dev_pm_ops bme680_dev_pm_ops;
+
+int bme680_core_probe(struct device *dev, struct regmap *regmap,
+		      const char *name);
+
+#endif  /* BME680_H_ */