common/ssp_sensors/ssp_iio_sensor.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef __SSP_IIO_SENSOR_H__
0003 #define __SSP_IIO_SENSOR_H__
0004
0005 #define SSP_CHANNEL_AG(_type, _mod, _index) \
0006 { \
0007         .type = _type,\
0008         .modified = 1,\
0009         .channel2 = _mod,\
0010         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ),\
0011         .scan_index = _index,\
0012         .scan_type = {\
0013             .sign = 's',\
0014             .realbits = 16,\
0015             .storagebits = 16,\
0016             .shift = 0,\
0017             .endianness = IIO_LE,\
0018         },\
0019 }
0020
0021 /* It is defined here as it is a mixed timestamp */
0022 #define SSP_CHAN_TIMESTAMP(_si) {                   \
0023     .type = IIO_TIMESTAMP,                      \
0024     .channel = -1,                          \
0025     .scan_index = _si,                      \
0026     .scan_type = {                          \
0027         .sign = 's',                        \
0028         .realbits = 64,                     \
0029         .storagebits = 64,                  \
0030         },                          \
0031 }
0032
0033 #define SSP_MS_PER_S            1000
0034 #define SSP_INVERTED_SCALING_FACTOR 1000000U
0035
0036 #define SSP_FACTOR_WITH_MS \
0037     (SSP_INVERTED_SCALING_FACTOR * SSP_MS_PER_S)
0038
0039 int ssp_common_buffer_postenable(struct iio_dev *indio_dev);
0040
0041 int ssp_common_buffer_postdisable(struct iio_dev *indio_dev);
0042
0043 int ssp_common_process_data(struct iio_dev *indio_dev, void *buf,
0044                 unsigned int len, int64_t timestamp);
0045
0046 /* Converts time in ms to frequency */
0047 static inline void ssp_convert_to_freq(u32 time, int *integer_part,
0048                        int *fractional)
0049 {
0050     if (time == 0) {
0051         *fractional = 0;
0052         *integer_part = 0;
0053         return;
0054     }
0055
0056     *integer_part = SSP_FACTOR_WITH_MS / time;
0057     *fractional = *integer_part % SSP_INVERTED_SCALING_FACTOR;
0058     *integer_part = *integer_part / SSP_INVERTED_SCALING_FACTOR;
0059 }
0060
0061 /* Converts frequency to time in ms */
0062 static inline int ssp_convert_to_time(int integer_part, int fractional)
0063 {
0064     u64 value;
0065
0066     value = (u64)integer_part * SSP_INVERTED_SCALING_FACTOR + fractional;
0067     if (value == 0)
0068         return 0;
0069
0070     return div64_u64((u64)SSP_FACTOR_WITH_MS, value);
0071 }
0072 #endif /* __SSP_IIO_SENSOR_H__ */