The PSU driver module complies with s3ip sysfs specification (sonic-net#12887)

Why I did it
Provide a PSU driver framework that complies with s3ip sysfs specification

How I did it
1、 The framework module provides register and unregister interface and implementation.
2、 The framework will help you create the sysfs node

How to verify it
A demo driver base on this framework will display the sysfs node wich conform to the s3ip sysfs specification

Author: tianshangfei

platform/s3ip-sysfs/s3ip_sysfs_frame/include/psu_sysfs.h

@@ -0,0 +1,38 @@
+#ifndef _PSU_SYSFS_H_
+#define _PSU_SYSFS_H_
+
+struct s3ip_sysfs_psu_drivers_s {
+    int (*get_psu_number)(void);
+    int (*get_psu_temp_number)(unsigned int psu_index);
+    ssize_t (*get_psu_model_name)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_serial_number)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_part_number)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_hardware_version)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_type)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_in_curr)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_in_vol)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_in_power)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_out_curr)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_out_vol)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_out_power)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_out_max_power)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_present_status)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_in_status)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_out_status)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_fan_speed)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_fan_ratio)(unsigned int psu_index, char *buf, size_t count);
+    int (*set_psu_fan_ratio)(unsigned int psu_index, int ratio);
+    ssize_t (*get_psu_fan_direction)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_led_status)(unsigned int psu_index, char *buf, size_t count);
+    ssize_t (*get_psu_temp_alias)(unsigned int psu_index, unsigned int temp_index, char *buf, size_t count);
+    ssize_t (*get_psu_temp_type)(unsigned int psu_index, unsigned int temp_index, char *buf, size_t count);
+    ssize_t (*get_psu_temp_max)(unsigned int psu_index, unsigned int temp_index, char *buf, size_t count);
+    int (*set_psu_temp_max)(unsigned int psu_index, unsigned int temp_index, const char *buf, size_t count);
+    ssize_t (*get_psu_temp_min)(unsigned int psu_index, unsigned int temp_index, char *buf, size_t count);
+    int (*set_psu_temp_min)(unsigned int psu_index, unsigned int temp_index, const char *buf, size_t count);
+    ssize_t (*get_psu_temp_value)(unsigned int psu_index, unsigned int temp_index, char *buf, size_t count);
+};
+
+extern int s3ip_sysfs_psu_drivers_register(struct s3ip_sysfs_psu_drivers_s *drv);
+extern void s3ip_sysfs_psu_drivers_unregister(void);
+#endif /*_PSU_SYSFS_H_ */