Update psud HLD (#1037)

Update psud HLD with the new schema of PSU_INFO.

Currently psud collect the psu's output voltage and current, we would like to collect the psu's input voltage and current.
Psud collect it in the same way it collect the output voltage and current (by calling to psu lib and for Mellanox psu lib access to hw-mgmt sysfs - "/var/run/hw-management/")

doc/psud/PSU_daemon_design.md

@@ -4,10 +4,13 @@
 
 ### Revision ###
 
+
  | Rev |     Date    |       Author       | Change Description                |
  |:---:|:-----------:|:------------------:|-----------------------------------|
  | 0.1 |             |      Chen Junchao  | Initial version                   |
- | 0.2 | August 4st, 2022 | Stephen Sun | Update according to the current implementation |
+ | 0.2 | August 4th, 2022 | Stephen Sun | Update according to the current implementation |
+ | 0.3 | August 8th, 2022 | Or Farfara | Add input current, voltage and max power |
+
 
 ## 1. Overview
 
@@ -18,6 +21,7 @@ The purpose of PSU daemon is to collect platform PSU data and trigger proper act
   - PSU entity information
   - PSU present status and power good status
   - PSU power, current, voltage and voltage threshold
+  - PSU max power, input current and input voltage
   - PSU temperature and temperature threshold
 - Monitor PSU event, set LED color and trigger syslog according to event type, including:
   - PSU present status and power good status
@@ -58,7 +62,10 @@ PSU information is stored in PSU table:
     voltage_max_threshold   = 1*3.3DIGIT                     ; the maximum voltage threshold of the PSU
     current                 = 1*3.3DIGIT                     ; the current of the PSU
     power                   = 1*3.3DIGIT                     ; the power of the PSU
-
+    input_voltage           = 1*3.3DIGIT                     ; input voltage of the psu
+    input_current           = 1*3.3DIGIT                     ; input current of the psu
+    max_power               = 1*4.3DIGIT                     ; power capacity of the psu
+
 
 Now psud only collect and update "presence" and "status" field.
 
@@ -155,6 +162,12 @@ class PsuBase(device_base.DeviceBase):
 
     def get_voltage_low_threshold(self):
         raise NotImplementedError
+
+    def get_input_voltage(self):
+        raise NotImplementedError
+
+    def get_input_current(self):
+        raise NotImplementedError
     ...
 
 ```