drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h

   1 /*
   2  * STMicroelectronics st_lsm6dsx sensor driver
   3  *
   4  * Copyright 2016 STMicroelectronics Inc.
   5  *
   6  * Lorenzo Bianconi <lorenzo.bianconi@st.com>
   7  * Denis Ciocca <denis.ciocca@st.com>
   8  *
   9  * Licensed under the GPL-2.
  10  */
  11
  12 #ifndef ST_LSM6DSX_H
  13 #define ST_LSM6DSX_H
  14
  15 #include <linux/device.h>
  16
  17 #define ST_LSM6DS3_DEV_NAME     "lsm6ds3"
  18 #define ST_LSM6DS3H_DEV_NAME    "lsm6ds3h"
  19 #define ST_LSM6DSL_DEV_NAME     "lsm6dsl"
  20 #define ST_LSM6DSM_DEV_NAME     "lsm6dsm"
  21 #define ST_ISM330DLC_DEV_NAME   "ism330dlc"
  22
  23 enum st_lsm6dsx_hw_id {
  24         ST_LSM6DS3_ID,
  25         ST_LSM6DS3H_ID,
  26         ST_LSM6DSL_ID,
  27         ST_LSM6DSM_ID,
  28         ST_ISM330DLC_ID,
  29         ST_LSM6DSX_MAX_ID,
  30 };
  31
  32 #define ST_LSM6DSX_BUFF_SIZE            400
  33 #define ST_LSM6DSX_CHAN_SIZE            2
  34 #define ST_LSM6DSX_SAMPLE_SIZE          6
  35 #define ST_LSM6DSX_MAX_WORD_LEN         ((32 / ST_LSM6DSX_SAMPLE_SIZE) * \
  36                                          ST_LSM6DSX_SAMPLE_SIZE)
  37 #define ST_LSM6DSX_SHIFT_VAL(val, mask) (((val) << __ffs(mask)) & (mask))
  38
  39 struct st_lsm6dsx_reg {
  40         u8 addr;
  41         u8 mask;
  42 };
  43
  44 /**
  45  * struct st_lsm6dsx_fifo_ops - ST IMU FIFO settings
  46  * @fifo_th: FIFO threshold register info (addr + mask).
  47  * @fifo_diff: FIFO diff status register info (addr + mask).
  48  * @th_wl: FIFO threshold word length.
  49  */
  50 struct st_lsm6dsx_fifo_ops {
  51         struct {
  52                 u8 addr;
  53                 u16 mask;
  54         } fifo_th;
  55         struct {
  56                 u8 addr;
  57                 u16 mask;
  58         } fifo_diff;
  59         u8 th_wl;
  60 };
  61
  62 /**
  63  * struct st_lsm6dsx_hw_ts_settings - ST IMU hw timer settings
  64  * @timer_en: Hw timer enable register info (addr + mask).
  65  * @hr_timer: Hw timer resolution register info (addr + mask).
  66  * @fifo_en: Hw timer FIFO enable register info (addr + mask).
  67  * @decimator: Hw timer FIFO decimator register info (addr + mask).
  68  */
  69 struct st_lsm6dsx_hw_ts_settings {
  70         struct st_lsm6dsx_reg timer_en;
  71         struct st_lsm6dsx_reg hr_timer;
  72         struct st_lsm6dsx_reg fifo_en;
  73         struct st_lsm6dsx_reg decimator;
  74 };
  75
  76 /**
  77  * struct st_lsm6dsx_settings - ST IMU sensor settings
  78  * @wai: Sensor WhoAmI default value.
  79  * @max_fifo_size: Sensor max fifo length in FIFO words.
  80  * @id: List of hw id supported by the driver configuration.
  81  * @decimator: List of decimator register info (addr + mask).
  82  * @fifo_ops: Sensor hw FIFO parameters.
  83  * @ts_settings: Hw timer related settings.
  84  */
  85 struct st_lsm6dsx_settings {
  86         u8 wai;
  87         u16 max_fifo_size;
  88         enum st_lsm6dsx_hw_id id[ST_LSM6DSX_MAX_ID];
  89         struct st_lsm6dsx_reg decimator[ST_LSM6DSX_MAX_ID];
  90         struct st_lsm6dsx_fifo_ops fifo_ops;
  91         struct st_lsm6dsx_hw_ts_settings ts_settings;
  92 };
  93
  94 enum st_lsm6dsx_sensor_id {
  95         ST_LSM6DSX_ID_ACC,
  96         ST_LSM6DSX_ID_GYRO,
  97         ST_LSM6DSX_ID_MAX,
  98 };
  99
 100 enum st_lsm6dsx_fifo_mode {
 101         ST_LSM6DSX_FIFO_BYPASS = 0x0,
 102         ST_LSM6DSX_FIFO_CONT = 0x6,
 103 };
 104
 105 /**
 106  * struct st_lsm6dsx_sensor - ST IMU sensor instance
 107  * @name: Sensor name.
 108  * @id: Sensor identifier.
 109  * @hw: Pointer to instance of struct st_lsm6dsx_hw.
 110  * @gain: Configured sensor sensitivity.
 111  * @odr: Output data rate of the sensor [Hz].
 112  * @watermark: Sensor watermark level.
 113  * @sip: Number of samples in a given pattern.
 114  * @decimator: FIFO decimation factor.
 115  * @ts_ref: Sensor timestamp reference for hw one.
 116  */
 117 struct st_lsm6dsx_sensor {
 118         char name[32];
 119         enum st_lsm6dsx_sensor_id id;
 120         struct st_lsm6dsx_hw *hw;
 121
 122         u32 gain;
 123         u16 odr;
 124
 125         u16 watermark;
 126         u8 sip;
 127         u8 decimator;
 128         s64 ts_ref;
 129 };
 130
 131 /**
 132  * struct st_lsm6dsx_hw - ST IMU MEMS hw instance
 133  * @dev: Pointer to instance of struct device (I2C or SPI).
 134  * @regmap: Register map of the device.
 135  * @irq: Device interrupt line (I2C or SPI).
 136  * @fifo_lock: Mutex to prevent concurrent access to the hw FIFO.
 137  * @conf_lock: Mutex to prevent concurrent FIFO configuration update.
 138  * @fifo_mode: FIFO operating mode supported by the device.
 139  * @enable_mask: Enabled sensor bitmask.
 140  * @ts_sip: Total number of timestamp samples in a given pattern.
 141  * @sip: Total number of samples (acc/gyro/ts) in a given pattern.
 142  * @buff: Device read buffer.
 143  * @iio_devs: Pointers to acc/gyro iio_dev instances.
 144  * @settings: Pointer to the specific sensor settings in use.
 145  */
 146 struct st_lsm6dsx_hw {
 147         struct device *dev;
 148         struct regmap *regmap;
 149         int irq;
 150
 151         struct mutex fifo_lock;
 152         struct mutex conf_lock;
 153
 154         enum st_lsm6dsx_fifo_mode fifo_mode;
 155         u8 enable_mask;
 156         u8 ts_sip;
 157         u8 sip;
 158
 159         u8 *buff;
 160
 161         struct iio_dev *iio_devs[ST_LSM6DSX_ID_MAX];
 162
 163         const struct st_lsm6dsx_settings *settings;
 164 };
 165
 166 extern const struct dev_pm_ops st_lsm6dsx_pm_ops;
 167
 168 int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id, const char *name,
 169                      struct regmap *regmap);
 170 int st_lsm6dsx_sensor_enable(struct st_lsm6dsx_sensor *sensor);
 171 int st_lsm6dsx_sensor_disable(struct st_lsm6dsx_sensor *sensor);
 172 int st_lsm6dsx_fifo_setup(struct st_lsm6dsx_hw *hw);
 173 int st_lsm6dsx_update_watermark(struct st_lsm6dsx_sensor *sensor,
 174                                 u16 watermark);
 175 int st_lsm6dsx_flush_fifo(struct st_lsm6dsx_hw *hw);
 176 int st_lsm6dsx_set_fifo_mode(struct st_lsm6dsx_hw *hw,
 177                              enum st_lsm6dsx_fifo_mode fifo_mode);
 178
 179 #endif /* ST_LSM6DSX_H */