Do less re-initialization of smbus, add battery charger enabling

src/board/system76/galp3-c/stdio.c

@@ -3,23 +3,11 @@
 #include <ec/smbus.h>
 
 void i2c_write(unsigned char value) {
+    // Write value to 0x76
+    TRASLAA = 0x76 << 1;
+    HOCMDA = value;
+
     for (;;) {
-        // Wait for last command
-        while (HOSTAA & 1) {}
-
-        // Clear result
-        HOSTAA = HOSTAA;
-
-        // Clock to 400 KHz
-        SCLKTSA = 3;
-
-        // Enable host interface with i2c compatibility
-        HOCTL2A = (1 << 1) | (1 << 0);
-
-        // Write value to 0x76
-        TRASLAA = 0x76 << 1;
-        HOCMDA = value;
-
         // Start command
         HOCTLA = (1 << 6) | (0b001 << 2);
 
@@ -33,9 +21,6 @@ void i2c_write(unsigned char value) {
         uint8_t status = HOSTAA;
         HOSTAA = status;
 
-        // Disable host interface
-        HOCTL2A = 0;
-
         // If there were no errors, return
         uint8_t error = (1 << 6) | (1 << 5) | (1 << 4) | (1 << 3) | (1 << 2);
         if (!(status & error)) {