kernel/drivers/iio/common/ssp_sensors/ssp_iio_sensor.h

   1 #ifndef __SSP_IIO_SENSOR_H__
   2 #define __SSP_IIO_SENSOR_H__
   3
   4 #define SSP_CHANNEL_AG(_type, _mod, _index) \
   5 { \
   6                 .type = _type,\
   7                 .modified = 1,\
   8                 .channel2 = _mod,\
   9                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ),\
  10                 .scan_index = _index,\
  11                 .scan_type = {\
  12                         .sign = 's',\
  13                         .realbits = 16,\
  14                         .storagebits = 16,\
  15                         .shift = 0,\
  16                         .endianness = IIO_LE,\
  17                 },\
  18 }
  19
  20 /* It is defined here as it is a mixed timestamp */
  21 #define SSP_CHAN_TIMESTAMP(_si) {                                       \
  22         .type = IIO_TIMESTAMP,                                          \
  23         .channel = -1,                                                  \
  24         .scan_index = _si,                                              \
  25         .scan_type = {                                                  \
  26                 .sign = 's',                                            \
  27                 .realbits = 64,                                         \
  28                 .storagebits = 64,                                      \
  29                 },                                                      \
  30 }
  31
  32 #define SSP_MS_PER_S                    1000
  33 #define SSP_INVERTED_SCALING_FACTOR     1000000U
  34
  35 #define SSP_FACTOR_WITH_MS \
  36         (SSP_INVERTED_SCALING_FACTOR * SSP_MS_PER_S)
  37
  38 int ssp_common_buffer_postenable(struct iio_dev *indio_dev);
  39
  40 int ssp_common_buffer_postdisable(struct iio_dev *indio_dev);
  41
  42 int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
  43                             unsigned int len, int64_t timestamp);
  44
  45 /* Converts time in ms to frequency */
  46 static inline void ssp_convert_to_freq(u32 time, int *integer_part,
  47                                        int *fractional)
  48 {
  49         if (time == 0) {
  50                 *fractional = 0;
  51                 *integer_part = 0;
  52                 return;
  53         }
  54
  55         *integer_part = SSP_FACTOR_WITH_MS / time;
  56         *fractional = *integer_part % SSP_INVERTED_SCALING_FACTOR;
  57         *integer_part = *integer_part / SSP_INVERTED_SCALING_FACTOR;
  58 }
  59
  60 /* Converts frequency to time in ms */
  61 static inline int ssp_convert_to_time(int integer_part, int fractional)
  62 {
  63         u64 value;
  64
  65         value = (u64)integer_part * SSP_INVERTED_SCALING_FACTOR + fractional;
  66         if (value == 0)
  67                 return 0;
  68
  69         return div64_u64((u64)SSP_FACTOR_WITH_MS, value);
  70 }
  71 #endif /* __SSP_IIO_SENSOR_H__ */