drivers/iio/common/ms_sensors/ms_sensors_i2c.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Measurements Specialties common sensor driver
   4  *
   5  * Copyright (c) 2015 Measurement-Specialties
   6  */
   7
   8 #ifndef _MS_SENSORS_I2C_H
   9 #define _MS_SENSORS_I2C_H
  10
  11 #include <linux/i2c.h>
  12 #include <linux/mutex.h>
  13
  14 #define MS_SENSORS_TP_PROM_WORDS_NB             8
  15
  16 /**
  17  * struct ms_ht_dev - Humidity/Temperature sensor device structure
  18  * @client:     i2c client
  19  * @lock:       lock protecting the i2c conversion
  20  * @res_index:  index to selected sensor resolution
  21  */
  22 struct ms_ht_dev {
  23         struct i2c_client *client;
  24         struct mutex lock;
  25         u8 res_index;
  26 };
  27
  28 /**
  29  * struct ms_hw_data - Temperature/Pressure sensor hardware data
  30  * @prom_len:           number of words in the PROM
  31  * @max_res_index:      maximum sensor resolution index
  32  */
  33 struct ms_tp_hw_data {
  34         u8 prom_len;
  35         u8 max_res_index;
  36 };
  37
  38 /**
  39  * struct ms_tp_dev - Temperature/Pressure sensor device structure
  40  * @client:     i2c client
  41  * @lock:       lock protecting the i2c conversion
  42  * @prom:       array of PROM coefficients used for conversion. Added element
  43  *              for CRC computation
  44  * @res_index:  index to selected sensor resolution
  45  */
  46 struct ms_tp_dev {
  47         struct i2c_client *client;
  48         struct mutex lock;
  49         const struct ms_tp_hw_data *hw;
  50         u16 prom[MS_SENSORS_TP_PROM_WORDS_NB];
  51         u8 res_index;
  52 };
  53
  54 int ms_sensors_reset(void *cli, u8 cmd, unsigned int delay);
  55 int ms_sensors_read_prom_word(void *cli, int cmd, u16 *word);
  56 int ms_sensors_convert_and_read(void *cli, u8 conv, u8 rd,
  57                                 unsigned int delay, u32 *adc);
  58 int ms_sensors_read_serial(struct i2c_client *client, u64 *sn);
  59 ssize_t ms_sensors_show_serial(struct ms_ht_dev *dev_data, char *buf);
  60 ssize_t ms_sensors_write_resolution(struct ms_ht_dev *dev_data, u8 i);
  61 ssize_t ms_sensors_show_battery_low(struct ms_ht_dev *dev_data, char *buf);
  62 ssize_t ms_sensors_show_heater(struct ms_ht_dev *dev_data, char *buf);
  63 ssize_t ms_sensors_write_heater(struct ms_ht_dev *dev_data,
  64                                 const char *buf, size_t len);
  65 int ms_sensors_ht_read_temperature(struct ms_ht_dev *dev_data,
  66                                    s32 *temperature);
  67 int ms_sensors_ht_read_humidity(struct ms_ht_dev *dev_data,
  68                                 u32 *humidity);
  69 int ms_sensors_tp_read_prom(struct ms_tp_dev *dev_data);
  70 int ms_sensors_read_temp_and_pressure(struct ms_tp_dev *dev_data,
  71                                       int *temperature,
  72                                       unsigned int *pressure);
  73
  74 #endif /* _MS_SENSORS_I2C_H */