327b5c0512
Adds DMA-safe buffers to driver data struct to store raw data from sensors The multiple buffers used thorough the driver share the same memory allocated as part of the device data instance. The union containing the buffers is aligned to allow safe usage with DMA operations, such as regmap bulk read calls. Updated measurement and calibration reading functions to use the safe DMA buffers. Suggested-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Angel Iglesias <ang.iglesiasg@gmail.com> Link: https://lore.kernel.org/r/7919793f7f63224d5ce413c66d648029683c17ac.1663025017.git.ang.iglesiasg@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/bitops.h>
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#include <linux/device.h>
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#include <linux/regmap.h>
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/* BMP280 specific registers */
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#define BMP280_REG_HUMIDITY_LSB 0xFE
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#define BMP280_REG_HUMIDITY_MSB 0xFD
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#define BMP280_REG_TEMP_XLSB 0xFC
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#define BMP280_REG_TEMP_LSB 0xFB
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#define BMP280_REG_TEMP_MSB 0xFA
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#define BMP280_REG_PRESS_XLSB 0xF9
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#define BMP280_REG_PRESS_LSB 0xF8
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#define BMP280_REG_PRESS_MSB 0xF7
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/* Helper mask to truncate excess 4 bits on pressure and temp readings */
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#define BMP280_MEAS_TRIM_MASK GENMASK(24, 4)
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#define BMP280_REG_CONFIG 0xF5
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#define BMP280_REG_CTRL_MEAS 0xF4
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#define BMP280_REG_STATUS 0xF3
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#define BMP280_REG_CTRL_HUMIDITY 0xF2
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/* Due to non linear mapping, and data sizes we can't do a bulk read */
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#define BMP280_REG_COMP_H1 0xA1
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#define BMP280_REG_COMP_H2 0xE1
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#define BMP280_REG_COMP_H3 0xE3
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#define BMP280_REG_COMP_H4 0xE4
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#define BMP280_REG_COMP_H5 0xE5
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#define BMP280_REG_COMP_H6 0xE7
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#define BMP280_REG_COMP_TEMP_START 0x88
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#define BMP280_COMP_TEMP_REG_COUNT 6
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#define BMP280_REG_COMP_PRESS_START 0x8E
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#define BMP280_COMP_PRESS_REG_COUNT 18
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#define BMP280_COMP_H5_MASK GENMASK(15, 4)
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#define BMP280_CONTIGUOUS_CALIB_REGS (BMP280_COMP_TEMP_REG_COUNT + \
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BMP280_COMP_PRESS_REG_COUNT)
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#define BMP280_FILTER_MASK GENMASK(4, 2)
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#define BMP280_FILTER_OFF 0
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#define BMP280_FILTER_2X 1
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#define BMP280_FILTER_4X 2
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#define BMP280_FILTER_8X 3
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#define BMP280_FILTER_16X 4
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#define BMP280_OSRS_HUMIDITY_MASK GENMASK(2, 0)
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#define BMP280_OSRS_HUMIDITY_SKIP 0
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#define BMP280_OSRS_HUMIDITY_1X 1
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#define BMP280_OSRS_HUMIDITY_2X 2
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#define BMP280_OSRS_HUMIDITY_4X 3
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#define BMP280_OSRS_HUMIDITY_8X 4
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#define BMP280_OSRS_HUMIDITY_16X 5
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#define BMP280_OSRS_TEMP_MASK GENMASK(7, 5)
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#define BMP280_OSRS_TEMP_SKIP 0
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#define BMP280_OSRS_TEMP_1X 1
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#define BMP280_OSRS_TEMP_2X 2
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#define BMP280_OSRS_TEMP_4X 3
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#define BMP280_OSRS_TEMP_8X 4
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#define BMP280_OSRS_TEMP_16X 5
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#define BMP280_OSRS_PRESS_MASK GENMASK(4, 2)
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#define BMP280_OSRS_PRESS_SKIP 0
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#define BMP280_OSRS_PRESS_1X 1
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#define BMP280_OSRS_PRESS_2X 2
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#define BMP280_OSRS_PRESS_4X 3
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#define BMP280_OSRS_PRESS_8X 4
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#define BMP280_OSRS_PRESS_16X 5
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#define BMP280_MODE_MASK GENMASK(1, 0)
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#define BMP280_MODE_SLEEP 0
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#define BMP280_MODE_FORCED 1
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#define BMP280_MODE_NORMAL 3
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/* BMP180 specific registers */
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#define BMP180_REG_OUT_XLSB 0xF8
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#define BMP180_REG_OUT_LSB 0xF7
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#define BMP180_REG_OUT_MSB 0xF6
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#define BMP180_REG_CALIB_START 0xAA
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#define BMP180_REG_CALIB_COUNT 22
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#define BMP180_MEAS_CTRL_MASK GENMASK(4, 0)
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#define BMP180_MEAS_TEMP 0x0E
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#define BMP180_MEAS_PRESS 0x14
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#define BMP180_MEAS_SCO BIT(5)
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#define BMP180_OSRS_PRESS_MASK GENMASK(7, 6)
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#define BMP180_MEAS_PRESS_1X 0
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#define BMP180_MEAS_PRESS_2X 1
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#define BMP180_MEAS_PRESS_4X 2
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#define BMP180_MEAS_PRESS_8X 3
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/* BMP180 and BMP280 common registers */
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#define BMP280_REG_CTRL_MEAS 0xF4
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#define BMP280_REG_RESET 0xE0
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#define BMP280_REG_ID 0xD0
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#define BMP180_CHIP_ID 0x55
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#define BMP280_CHIP_ID 0x58
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#define BME280_CHIP_ID 0x60
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#define BMP280_SOFT_RESET_VAL 0xB6
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/* BMP280 register skipped special values */
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#define BMP280_TEMP_SKIPPED 0x80000
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#define BMP280_PRESS_SKIPPED 0x80000
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#define BMP280_HUMIDITY_SKIPPED 0x8000
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/* Regmap configurations */
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extern const struct regmap_config bmp180_regmap_config;
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extern const struct regmap_config bmp280_regmap_config;
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/* Probe called from different transports */
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int bmp280_common_probe(struct device *dev,
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struct regmap *regmap,
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unsigned int chip,
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const char *name,
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int irq);
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/* PM ops */
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extern const struct dev_pm_ops bmp280_dev_pm_ops;
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