479 lines
13 KiB
C
479 lines
13 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/iio/iio.h>
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#include <linux/regmap.h>
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#include <linux/regulator/consumer.h>
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/* BMP580 specific registers */
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#define BMP580_REG_CMD 0x7E
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#define BMP580_REG_EFF_OSR 0x38
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#define BMP580_REG_ODR_CONFIG 0x37
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#define BMP580_REG_OSR_CONFIG 0x36
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#define BMP580_REG_IF_CONFIG 0x13
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#define BMP580_REG_REV_ID 0x02
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#define BMP580_REG_CHIP_ID 0x01
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/* OOR allows to configure a pressure alarm */
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#define BMP580_REG_OOR_CONFIG 0x35
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#define BMP580_REG_OOR_RANGE 0x34
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#define BMP580_REG_OOR_THR_MSB 0x33
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#define BMP580_REG_OOR_THR_LSB 0x32
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/* DSP registers (IIR filters) */
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#define BMP580_REG_DSP_IIR 0x31
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#define BMP580_REG_DSP_CONFIG 0x30
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/* NVM access registers */
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#define BMP580_REG_NVM_DATA_MSB 0x2D
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#define BMP580_REG_NVM_DATA_LSB 0x2C
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#define BMP580_REG_NVM_ADDR 0x2B
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/* Status registers */
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#define BMP580_REG_STATUS 0x28
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#define BMP580_REG_INT_STATUS 0x27
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#define BMP580_REG_CHIP_STATUS 0x11
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/* Data registers */
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#define BMP580_REG_FIFO_DATA 0x29
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#define BMP580_REG_PRESS_MSB 0x22
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#define BMP580_REG_PRESS_LSB 0x21
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#define BMP580_REG_PRESS_XLSB 0x20
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#define BMP580_REG_TEMP_MSB 0x1F
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#define BMP580_REG_TEMP_LSB 0x1E
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#define BMP580_REG_TEMP_XLSB 0x1D
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/* FIFO config registers */
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#define BMP580_REG_FIFO_SEL 0x18
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#define BMP580_REG_FIFO_COUNT 0x17
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#define BMP580_REG_FIFO_CONFIG 0x16
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/* Interruptions config registers */
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#define BMP580_REG_INT_SOURCE 0x15
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#define BMP580_REG_INT_CONFIG 0x14
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#define BMP580_CMD_NOOP 0x00
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#define BMP580_CMD_EXTMODE_SEQ_0 0x73
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#define BMP580_CMD_EXTMODE_SEQ_1 0xB4
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#define BMP580_CMD_EXTMODE_SEQ_2 0x69
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#define BMP580_CMD_NVM_OP_SEQ_0 0x5D
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#define BMP580_CMD_NVM_READ_SEQ_1 0xA5
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#define BMP580_CMD_NVM_WRITE_SEQ_1 0xA0
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#define BMP580_CMD_SOFT_RESET 0xB6
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#define BMP580_INT_STATUS_POR_MASK BIT(4)
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#define BMP580_STATUS_CORE_RDY_MASK BIT(0)
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#define BMP580_STATUS_NVM_RDY_MASK BIT(1)
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#define BMP580_STATUS_NVM_ERR_MASK BIT(2)
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#define BMP580_STATUS_NVM_CMD_ERR_MASK BIT(3)
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#define BMP580_OSR_PRESS_MASK GENMASK(5, 3)
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#define BMP580_OSR_TEMP_MASK GENMASK(2, 0)
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#define BMP580_OSR_PRESS_EN BIT(6)
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#define BMP580_EFF_OSR_PRESS_MASK GENMASK(5, 3)
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#define BMP580_EFF_OSR_TEMP_MASK GENMASK(2, 0)
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#define BMP580_EFF_OSR_VALID_ODR BIT(7)
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#define BMP580_ODR_MASK GENMASK(6, 2)
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#define BMP580_MODE_MASK GENMASK(1, 0)
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#define BMP580_MODE_SLEEP 0
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#define BMP580_MODE_NORMAL 1
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#define BMP580_MODE_FORCED 2
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#define BMP580_MODE_CONTINOUS 3
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#define BMP580_ODR_DEEPSLEEP_DIS BIT(7)
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#define BMP580_DSP_COMP_MASK GENMASK(1, 0)
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#define BMP580_DSP_COMP_DIS 0
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#define BMP580_DSP_TEMP_COMP_EN 1
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/*
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* In section 7.27 of datasheet, modes 2 and 3 are technically the same.
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* Pressure compensation means also enabling temperature compensation
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*/
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#define BMP580_DSP_PRESS_COMP_EN 2
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#define BMP580_DSP_PRESS_TEMP_COMP_EN 3
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#define BMP580_DSP_IIR_FORCED_FLUSH BIT(2)
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#define BMP580_DSP_SHDW_IIR_TEMP_EN BIT(3)
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#define BMP580_DSP_FIFO_IIR_TEMP_EN BIT(4)
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#define BMP580_DSP_SHDW_IIR_PRESS_EN BIT(5)
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#define BMP580_DSP_FIFO_IIR_PRESS_EN BIT(6)
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#define BMP580_DSP_OOR_IIR_PRESS_EN BIT(7)
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#define BMP580_DSP_IIR_PRESS_MASK GENMASK(5, 3)
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#define BMP580_DSP_IIR_TEMP_MASK GENMASK(2, 0)
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#define BMP580_FILTER_OFF 0
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#define BMP580_FILTER_1X 1
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#define BMP580_FILTER_3X 2
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#define BMP580_FILTER_7X 3
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#define BMP580_FILTER_15X 4
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#define BMP580_FILTER_31X 5
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#define BMP580_FILTER_63X 6
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#define BMP580_FILTER_127X 7
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#define BMP580_NVM_ROW_ADDR_MASK GENMASK(5, 0)
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#define BMP580_NVM_PROG_EN BIT(6)
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#define BMP580_TEMP_SKIPPED 0x7f7f7f
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#define BMP580_PRESS_SKIPPED 0x7f7f7f
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/* BMP380 specific registers */
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#define BMP380_REG_CMD 0x7E
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#define BMP380_REG_CONFIG 0x1F
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#define BMP380_REG_ODR 0x1D
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#define BMP380_REG_OSR 0x1C
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#define BMP380_REG_POWER_CONTROL 0x1B
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#define BMP380_REG_IF_CONFIG 0x1A
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#define BMP380_REG_INT_CONTROL 0x19
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#define BMP380_REG_INT_STATUS 0x11
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#define BMP380_REG_EVENT 0x10
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#define BMP380_REG_STATUS 0x03
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#define BMP380_REG_ERROR 0x02
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#define BMP380_REG_ID 0x00
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#define BMP380_REG_FIFO_CONFIG_1 0x18
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#define BMP380_REG_FIFO_CONFIG_2 0x17
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#define BMP380_REG_FIFO_WATERMARK_MSB 0x16
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#define BMP380_REG_FIFO_WATERMARK_LSB 0x15
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#define BMP380_REG_FIFO_DATA 0x14
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#define BMP380_REG_FIFO_LENGTH_MSB 0x13
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#define BMP380_REG_FIFO_LENGTH_LSB 0x12
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#define BMP380_REG_SENSOR_TIME_MSB 0x0E
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#define BMP380_REG_SENSOR_TIME_LSB 0x0D
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#define BMP380_REG_SENSOR_TIME_XLSB 0x0C
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#define BMP380_REG_TEMP_MSB 0x09
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#define BMP380_REG_TEMP_LSB 0x08
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#define BMP380_REG_TEMP_XLSB 0x07
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#define BMP380_REG_PRESS_MSB 0x06
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#define BMP380_REG_PRESS_LSB 0x05
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#define BMP380_REG_PRESS_XLSB 0x04
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#define BMP380_REG_CALIB_TEMP_START 0x31
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#define BMP380_CALIB_REG_COUNT 21
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#define BMP380_FILTER_MASK GENMASK(3, 1)
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#define BMP380_FILTER_OFF 0
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#define BMP380_FILTER_1X 1
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#define BMP380_FILTER_3X 2
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#define BMP380_FILTER_7X 3
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#define BMP380_FILTER_15X 4
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#define BMP380_FILTER_31X 5
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#define BMP380_FILTER_63X 6
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#define BMP380_FILTER_127X 7
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#define BMP380_OSRS_TEMP_MASK GENMASK(5, 3)
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#define BMP380_OSRS_PRESS_MASK GENMASK(2, 0)
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#define BMP380_ODRS_MASK GENMASK(4, 0)
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#define BMP380_CTRL_SENSORS_MASK GENMASK(1, 0)
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#define BMP380_CTRL_SENSORS_PRESS_EN BIT(0)
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#define BMP380_CTRL_SENSORS_TEMP_EN BIT(1)
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#define BMP380_MODE_MASK GENMASK(5, 4)
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#define BMP380_MODE_SLEEP 0
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#define BMP380_MODE_FORCED 1
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#define BMP380_MODE_NORMAL 3
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#define BMP380_MIN_TEMP -4000
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#define BMP380_MAX_TEMP 8500
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#define BMP380_MIN_PRES 3000000
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#define BMP380_MAX_PRES 12500000
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#define BMP380_CMD_NOOP 0x00
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#define BMP380_CMD_EXTMODE_EN_MID 0x34
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#define BMP380_CMD_FIFO_FLUSH 0xB0
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#define BMP380_CMD_SOFT_RESET 0xB6
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#define BMP380_STATUS_CMD_RDY_MASK BIT(4)
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#define BMP380_STATUS_DRDY_PRESS_MASK BIT(5)
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#define BMP380_STATUS_DRDY_TEMP_MASK BIT(6)
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#define BMP380_ERR_FATAL_MASK BIT(0)
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#define BMP380_ERR_CMD_MASK BIT(1)
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#define BMP380_ERR_CONF_MASK BIT(2)
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#define BMP380_TEMP_SKIPPED 0x800000
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#define BMP380_PRESS_SKIPPED 0x800000
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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 BMP380_CHIP_ID 0x50
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#define BMP580_CHIP_ID 0x50
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#define BMP580_CHIP_ID_ALT 0x51
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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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/* Core exported structs */
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static const char *const bmp280_supply_names[] = {
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"vddd", "vdda"
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};
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#define BMP280_NUM_SUPPLIES ARRAY_SIZE(bmp280_supply_names)
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struct bmp180_calib {
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s16 AC1;
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s16 AC2;
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s16 AC3;
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u16 AC4;
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u16 AC5;
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u16 AC6;
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s16 B1;
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s16 B2;
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s16 MB;
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s16 MC;
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s16 MD;
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};
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/* See datasheet Section 4.2.2. */
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struct bmp280_calib {
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u16 T1;
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s16 T2;
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s16 T3;
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u16 P1;
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s16 P2;
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s16 P3;
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s16 P4;
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s16 P5;
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s16 P6;
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s16 P7;
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s16 P8;
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s16 P9;
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u8 H1;
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s16 H2;
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u8 H3;
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s16 H4;
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s16 H5;
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s8 H6;
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};
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/* See datasheet Section 3.11.1. */
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struct bmp380_calib {
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u16 T1;
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u16 T2;
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s8 T3;
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s16 P1;
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s16 P2;
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s8 P3;
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s8 P4;
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u16 P5;
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u16 P6;
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s8 P7;
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s8 P8;
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s16 P9;
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s8 P10;
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s8 P11;
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};
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struct bmp280_data {
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struct device *dev;
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struct mutex lock;
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struct regmap *regmap;
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struct completion done;
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bool use_eoc;
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const struct bmp280_chip_info *chip_info;
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union {
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struct bmp180_calib bmp180;
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struct bmp280_calib bmp280;
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struct bmp380_calib bmp380;
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} calib;
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struct regulator_bulk_data supplies[BMP280_NUM_SUPPLIES];
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unsigned int start_up_time; /* in microseconds */
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/* log of base 2 of oversampling rate */
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u8 oversampling_press;
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u8 oversampling_temp;
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u8 oversampling_humid;
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u8 iir_filter_coeff;
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/*
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* BMP380 devices introduce sampling frequency configuration. See
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* datasheet sections 3.3.3. and 4.3.19 for more details.
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*
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* BMx280 devices allowed indirect configuration of sampling frequency
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* changing the t_standby duration between measurements, as detailed on
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* section 3.6.3 of the datasheet.
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*/
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int sampling_freq;
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/*
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* Carryover value from temperature conversion, used in pressure
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* calculation.
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*/
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s32 t_fine;
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/*
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* DMA (thus cache coherency maintenance) may require the
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* transfer buffers to live in their own cache lines.
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*/
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union {
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/* Sensor data buffer */
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u8 buf[3];
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/* Calibration data buffers */
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__le16 bmp280_cal_buf[BMP280_CONTIGUOUS_CALIB_REGS / 2];
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__be16 bmp180_cal_buf[BMP180_REG_CALIB_COUNT / 2];
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u8 bmp380_cal_buf[BMP380_CALIB_REG_COUNT];
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/* Miscellaneous, endianess-aware data buffers */
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__le16 le16;
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__be16 be16;
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} __aligned(IIO_DMA_MINALIGN);
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};
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struct bmp280_chip_info {
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unsigned int id_reg;
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const unsigned int chip_id;
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const struct regmap_config *regmap_config;
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const struct iio_chan_spec *channels;
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int num_channels;
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unsigned int start_up_time;
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const int *oversampling_temp_avail;
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int num_oversampling_temp_avail;
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int oversampling_temp_default;
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const int *oversampling_press_avail;
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int num_oversampling_press_avail;
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int oversampling_press_default;
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const int *oversampling_humid_avail;
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int num_oversampling_humid_avail;
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int oversampling_humid_default;
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const int *iir_filter_coeffs_avail;
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int num_iir_filter_coeffs_avail;
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int iir_filter_coeff_default;
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const int (*sampling_freq_avail)[2];
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int num_sampling_freq_avail;
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int sampling_freq_default;
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int (*chip_config)(struct bmp280_data *);
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int (*read_temp)(struct bmp280_data *, int *, int *);
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int (*read_press)(struct bmp280_data *, int *, int *);
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int (*read_humid)(struct bmp280_data *, int *, int *);
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int (*read_calib)(struct bmp280_data *);
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int (*preinit)(struct bmp280_data *);
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};
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/* Chip infos for each variant */
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extern const struct bmp280_chip_info bmp180_chip_info;
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extern const struct bmp280_chip_info bmp280_chip_info;
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extern const struct bmp280_chip_info bme280_chip_info;
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extern const struct bmp280_chip_info bmp380_chip_info;
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extern const struct bmp280_chip_info bmp580_chip_info;
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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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extern const struct regmap_config bmp380_regmap_config;
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extern const struct regmap_config bmp580_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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const struct bmp280_chip_info *,
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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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