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

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

@@ -3,18 +3,6 @@
 #include <board/smbus.h>
 
 uint8_t smbus_read(uint8_t address, uint8_t command, uint16_t * data) {
-    // Wait for last command
-    while (HOSTAA & 1) {}
-
-    // Clear result
-    HOSTAA = HOSTAA;
-
-    // Clock to 400 KHz
-    SCLKTSA = 3;
-
-    // Enable host interface
-    HOCTL2A = 1 << 0;
-
     // Read value from address
     TRASLAA = (address << 1) | (1 << 0);
     HOCMDA = command;
@@ -32,9 +20,6 @@ uint8_t smbus_read(uint8_t address, uint8_t command, uint16_t * data) {
     uint8_t status = HOSTAA;
     HOSTAA = status;
 
-    // Disable host interface
-    HOCTL2A = 0;
-
     // If there were no errors, set value and return 0
     uint8_t error = (1 << 6) | (1 << 5) | (1 << 4) | (1 << 3) | (1 << 2);
     if (!(status & error)) {
@@ -48,18 +33,6 @@ uint8_t smbus_read(uint8_t address, uint8_t command, uint16_t * data) {
 }
 
 uint8_t smbus_write(uint8_t address, uint8_t command, uint16_t data) {
-    // Wait for last command
-    while (HOSTAA & 1) {}
-
-    // Clear result
-    HOSTAA = HOSTAA;
-
-    // Clock to 400 KHz
-    SCLKTSA = 3;
-
-    // Enable host interface
-    HOCTL2A = 1 << 0;
-
     // Write value to address
     TRASLAA = (address << 1);
     HOCMDA = command;
@@ -80,14 +53,41 @@ uint8_t smbus_write(uint8_t address, uint8_t command, uint16_t data) {
     uint8_t status = HOSTAA;
     HOSTAA = status;
 
-    // Disable host interface
-    HOCTL2A = 0;
-
     // If there were no errors, set value and return 0
     uint8_t error = (1 << 6) | (1 << 5) | (1 << 4) | (1 << 3) | (1 << 2);
     //TODO: custom error type or flags for errors
     return (status & error);
 }
+
+uint8_t battery_charger_disable(void) {
+    uint8_t err = 0;
+
+    // Disable charge current
+    err = smbus_write(0x09, 0x14, 0);
+    if (err) return err;
+
+    // Disable charge voltage
+    err = smbus_write(0x09, 0x15, 0);
+    if (err) return err;
+}
+
+uint8_t battery_charger_enable(void) {
+    uint8_t err = 0;
+
+    err = battery_charger_disable();
+    if (err) return err;
+
+    // Set charge current to ~1.5 A
+    err = smbus_write(0x09, 0x14, 0x0600);
+    if (err) return err;
+
+    // Set charge voltage to ~13 V
+    err = smbus_write(0x09, 0x15, 0x3300);
+    if (err) return err;
+
+    return 0;
+}
+
 void battery_debug(void) {
     uint16_t data = 0;
     uint8_t err = 0;

src/board/system76/galp3-c/include/board/battery.h

@@ -1,6 +1,7 @@
 #ifndef _BOARD_BATTERY_H
 #define _BOARD_BATTERY_H
 
+void battery_charger_enable(void);
 void battery_debug(void);
 
 #endif // _BOARD_BATTERY_H

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

@@ -99,9 +99,9 @@ void touchpad_event(struct Ps2 * ps2) {
     //TODO
 }
 
-
+struct Gpio __code LED_PWR = GPIO(A, 7);
-//struct Gpio __code LED_PWR = GPIO(A, 7);
+struct Gpio __code LED_SSD_N = GPIO(G, 6);
-//struct Gpio __code LED_AIRPLANE_N = GPIO(G, 6);
+struct Gpio __code LED_AIRPLANE_N = GPIO(G, 6);
 
 void main(void) {
     init();

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

@@ -8,4 +8,10 @@ void smbus_init(void) {
     SMB25MS = 0x19;
     SMB45P3USL = 0x5C;
     SMB45P3USH = 0x01;
+
+    // Clock to 400 KHz
+    SCLKTSA = 3;
+
+    // Enable host interface
+    HOCTL2A = 1 << 0;
 }

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)) {