drivers/iio/humidity/hts221.h

   1 /*
   2  * STMicroelectronics hts221 sensor driver
   3  *
   4  * Copyright 2016 STMicroelectronics Inc.
   5  *
   6  * Lorenzo Bianconi <lorenzo.bianconi@st.com>
   7  *
   8  * Licensed under the GPL-2.
   9  */
  10
  11 #ifndef HTS221_H
  12 #define HTS221_H
  13
  14 #define HTS221_DEV_NAME         "hts221"
  15
  16 #include <linux/iio/iio.h>
  17
  18 #define HTS221_RX_MAX_LENGTH    8
  19 #define HTS221_TX_MAX_LENGTH    8
  20
  21 #define HTS221_DATA_SIZE        2
  22
  23 struct hts221_transfer_buffer {
  24         u8 rx_buf[HTS221_RX_MAX_LENGTH];
  25         u8 tx_buf[HTS221_TX_MAX_LENGTH] ____cacheline_aligned;
  26 };
  27
  28 struct hts221_transfer_function {
  29         int (*read)(struct device *dev, u8 addr, int len, u8 *data);
  30         int (*write)(struct device *dev, u8 addr, int len, u8 *data);
  31 };
  32
  33 #define HTS221_AVG_DEPTH        8
  34 struct hts221_avg_avl {
  35         u16 avg;
  36         u8 val;
  37 };
  38
  39 enum hts221_sensor_type {
  40         HTS221_SENSOR_H,
  41         HTS221_SENSOR_T,
  42         HTS221_SENSOR_MAX,
  43 };
  44
  45 struct hts221_sensor {
  46         u8 cur_avg_idx;
  47         int slope, b_gen;
  48 };
  49
  50 struct hts221_hw {
  51         const char *name;
  52         struct device *dev;
  53
  54         struct mutex lock;
  55         struct iio_trigger *trig;
  56         int irq;
  57
  58         struct hts221_sensor sensors[HTS221_SENSOR_MAX];
  59
  60         u8 odr;
  61
  62         const struct hts221_transfer_function *tf;
  63         struct hts221_transfer_buffer tb;
  64 };
  65
  66 int hts221_config_drdy(struct hts221_hw *hw, bool enable);
  67 int hts221_probe(struct iio_dev *iio_dev);
  68 int hts221_power_on(struct hts221_hw *hw);
  69 int hts221_power_off(struct hts221_hw *hw);
  70 int hts221_allocate_buffers(struct hts221_hw *hw);
  71 int hts221_allocate_trigger(struct hts221_hw *hw);
  72
  73 #endif /* HTS221_H */