1 /* 2 $License: 3 Copyright (C) 2014 InvenSense Corporation, All Rights Reserved. 4 $ 5 */ 6 7 /** 8 * @brief Provides helpful file IO wrappers for use with sysfs. 9 * @details Based on Jonathan Cameron's @e iio_utils.h. 10 */ 11 12 #ifndef _INV_SYSFS_UTILS_H_ 13 #define _INV_SYSFS_UTILS_H_ 14 15 /** 16 * struct inv_sysfs_names_s - Files needed by user applications. 17 * @buffer: Ring buffer attached to FIFO. 18 * @enable: Turns on HW-to-ring buffer flow. 19 * @raw_data: Raw data from registers. 20 * @temperature: Temperature data from register. 21 * @fifo_rate: FIFO rate/ODR. 22 * @power_state: Power state (this is a five-star comment). 23 * @fsr: Full-scale range. 24 * @lpf: Digital low pass filter. 25 * @scale: LSBs / dps (or LSBs / Gs). 26 * @temp_scale: LSBs / degrees C. 27 * @temp_offset: Offset in LSBs. 28 */ 29 struct inv_sysfs_names_s { 30 31 //Sysfs for ITG3500 & MPU6050 32 const char *buffer; 33 const char *enable; 34 const char *raw_data; //Raw Gyro data 35 const char *temperature; 36 const char *fifo_rate; 37 const char *power_state; 38 const char *fsr; 39 const char *lpf; 40 const char *scale; //Gyro scale 41 const char *temp_scale; 42 const char *temp_offset; 43 const char *self_test; 44 //Starting Sysfs available for MPU6050 only 45 const char *accel_en; 46 const char *accel_fifo_en; 47 const char *accel_fs; 48 const char *clock_source; 49 const char *early_suspend_en; 50 const char *firmware_loaded; 51 const char *gyro_en; 52 const char *gyro_fifo_en; 53 const char *key; 54 const char *raw_accel; 55 const char *reg_dump; 56 const char *tap_on; 57 const char *dmp_firmware; 58 }; 59 60 /* File IO. Typically won't be called directly by user application, but they'll 61 * be here for your enjoyment. 62 */ 63 int inv_sysfs_write(char *filename, long data); 64 int inv_sysfs_read(char *filename, long num_bytes, char *data); 65 66 /* Helper APIs to extract specific data. */ 67 int inv_read_buffer(int fd, long *data, long long *timestamp); 68 int inv_read_raw(const struct inv_sysfs_names_s *names, long *data, 69 long long *timestamp); 70 int inv_read_temperature_raw(const struct inv_sysfs_names_s *names, short *data, 71 long long *timestamp); 72 int inv_read_fifo_rate(const struct inv_sysfs_names_s *names, short *data); 73 int inv_read_power_state(const struct inv_sysfs_names_s *names, char *data); 74 int inv_read_scale(const struct inv_sysfs_names_s *names, float *data); 75 int inv_read_temp_scale(const struct inv_sysfs_names_s *names, short *data); 76 int inv_read_temp_offset(const struct inv_sysfs_names_s *names, short *data); 77 int inv_write_fifo_rate(const struct inv_sysfs_names_s *names, short data); 78 int inv_write_buffer_enable(const struct inv_sysfs_names_s *names, char data); 79 int inv_write_power_state(const struct inv_sysfs_names_s *names, char data); 80 81 /* Scaled data. */ 82 int inv_read_q16(const struct inv_sysfs_names_s *names, long *data, 83 long long *timestamp); 84 int inv_read_temp_q16(const struct inv_sysfs_names_s *names, long *data, 85 long long *timestamp); 86 87 88 #endif /* #ifndef _INV_SYSFS_UTILS_H_ */ 89 90 91
