drivers/iio/pressure/hsc030pa.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Honeywell TruStability HSC Series pressure/temperature sensor
   4  *
   5  * Copyright (c) 2023 Petre Rodan <petre.rodan@subdimension.ro>
   6  */
   7
   8 #ifndef _HSC030PA_H
   9 #define _HSC030PA_H
  10
  11 #include <linux/types.h>
  12
  13 #include <linux/iio/iio.h>
  14
  15 #define HSC_REG_MEASUREMENT_RD_SIZE 4
  16 #define HSC_RESP_TIME_MS            2
  17
  18 struct device;
  19
  20 struct iio_chan_spec;
  21 struct iio_dev;
  22
  23 struct hsc_data;
  24 struct hsc_chip_data;
  25
  26 typedef int (*hsc_recv_fn)(struct hsc_data *);
  27
  28 /**
  29  * struct hsc_data
  30  * @dev: current device structure
  31  * @chip: structure containing chip's channel properties
  32  * @recv_cb: function that implements the chip reads
  33  * @is_valid: true if last transfer has been validated
  34  * @pmin: minimum measurable pressure limit
  35  * @pmax: maximum measurable pressure limit
  36  * @outmin: minimum raw pressure in counts (based on transfer function)
  37  * @outmax: maximum raw pressure in counts (based on transfer function)
  38  * @function: transfer function
  39  * @p_scale: pressure scale
  40  * @p_scale_dec: pressure scale, decimal places
  41  * @p_offset: pressure offset
  42  * @p_offset_dec: pressure offset, decimal places
  43  * @buffer: raw conversion data
  44  */
  45 struct hsc_data {
  46         struct device *dev;
  47         const struct hsc_chip_data *chip;
  48         hsc_recv_fn recv_cb;
  49         bool is_valid;
  50         s32 pmin;
  51         s32 pmax;
  52         u32 outmin;
  53         u32 outmax;
  54         u32 function;
  55         s64 p_scale;
  56         s32 p_scale_dec;
  57         s64 p_offset;
  58         s32 p_offset_dec;
  59         struct {
  60                 __be16 chan[2];
  61                 s64 timestamp __aligned(8);
  62         } scan;
  63         u8 buffer[HSC_REG_MEASUREMENT_RD_SIZE] __aligned(IIO_DMA_MINALIGN);
  64 };
  65
  66 struct hsc_chip_data {
  67         bool (*valid)(struct hsc_data *data);
  68         const struct iio_chan_spec *channels;
  69         u8 num_channels;
  70 };
  71
  72 enum hsc_func_id {
  73         HSC_FUNCTION_A,
  74         HSC_FUNCTION_B,
  75         HSC_FUNCTION_C,
  76         HSC_FUNCTION_F,
  77 };
  78
  79 int hsc_common_probe(struct device *dev, hsc_recv_fn recv);
  80
  81 #endif