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e4a70e3e7d
Add support to STM HTS221 humidity + temperature sensor http://www.st.com/resource/en/datasheet/hts221.pdf - continuous mode support - i2c support - spi support - trigger mode support Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
73 lines
1.4 KiB
C
73 lines
1.4 KiB
C
/*
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* STMicroelectronics hts221 sensor driver
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*
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* Copyright 2016 STMicroelectronics Inc.
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*
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* Lorenzo Bianconi <lorenzo.bianconi@st.com>
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*
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* Licensed under the GPL-2.
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*/
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#ifndef HTS221_H
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#define HTS221_H
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#define HTS221_DEV_NAME "hts221"
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#include <linux/iio/iio.h>
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#define HTS221_RX_MAX_LENGTH 8
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#define HTS221_TX_MAX_LENGTH 8
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#define HTS221_DATA_SIZE 2
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struct hts221_transfer_buffer {
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u8 rx_buf[HTS221_RX_MAX_LENGTH];
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u8 tx_buf[HTS221_TX_MAX_LENGTH] ____cacheline_aligned;
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};
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struct hts221_transfer_function {
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int (*read)(struct device *dev, u8 addr, int len, u8 *data);
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int (*write)(struct device *dev, u8 addr, int len, u8 *data);
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};
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#define HTS221_AVG_DEPTH 8
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struct hts221_avg_avl {
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u16 avg;
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u8 val;
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};
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enum hts221_sensor_type {
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HTS221_SENSOR_H,
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HTS221_SENSOR_T,
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HTS221_SENSOR_MAX,
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};
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struct hts221_sensor {
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u8 cur_avg_idx;
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int slope, b_gen;
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};
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struct hts221_hw {
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const char *name;
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struct device *dev;
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struct mutex lock;
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struct iio_trigger *trig;
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int irq;
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struct hts221_sensor sensors[HTS221_SENSOR_MAX];
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u8 odr;
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const struct hts221_transfer_function *tf;
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struct hts221_transfer_buffer tb;
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};
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int hts221_config_drdy(struct hts221_hw *hw, bool enable);
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int hts221_probe(struct iio_dev *iio_dev);
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int hts221_power_on(struct hts221_hw *hw);
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int hts221_power_off(struct hts221_hw *hw);
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int hts221_allocate_buffers(struct hts221_hw *hw);
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int hts221_allocate_trigger(struct hts221_hw *hw);
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#endif /* HTS221_H */
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