Add TCPM I2C bus and initialize it

src/board/system76/lemp9/board.mk

@@ -19,6 +19,9 @@ CFLAGS+=-DI2C_DEBUGGER=0x76
 # Set battery I2C bus
 CFLAGS+=-DI2C_SMBUS=I2C_4
 
+# Set type-c port manager I2C bus
+CFLAGS+=-DI2C_TCPM=I2C_1
+
 # Set scratch ROM parameters
 SCRATCH_OFFSET=1024
 SCRATCH_SIZE=1024

src/board/system76/lemp9/gpio.c

@@ -11,6 +11,7 @@ struct Gpio __code CCD_EN =         GPIO(D, 1);
 struct Gpio __code DD_ON =          GPIO(E, 4);
 struct Gpio __code EC_EN =          GPIO(J, 6);
 struct Gpio __code EC_RSMRST_N =    GPIO(E, 5);
+struct Gpio __code EC_SMD_EN_N =    GPIO(I, 6);
 struct Gpio __code LED_ACIN =       GPIO(C, 7);
 struct Gpio __code LED_PWR =        GPIO(D, 0);
 struct Gpio __code LID_SW_N =       GPIO(B, 1);
@@ -91,9 +92,9 @@ void gpio_init() {
     // ALL_SYS_PWRGD
     GPCRC0 = GPIO_IN;
     // SMB_CLK_EC
-    GPCRC1 = GPIO_OUT;
+    GPCRC1 = GPIO_ALT;
     // SMB_DATA_EC
-    GPCRC2 = GPIO_OUT;
+    GPCRC2 = GPIO_ALT;
     // PCIE_WAKE#
     GPCRC3 = GPIO_IN;
     // CNVI_DET#

src/board/system76/lemp9/include/board/gpio.h

@@ -22,6 +22,7 @@ extern struct Gpio __code CCD_EN;
 extern struct Gpio __code DD_ON;
 extern struct Gpio __code EC_EN;
 extern struct Gpio __code EC_RSMRST_N;
+extern struct Gpio __code EC_SMD_EN_N;
 extern struct Gpio __code LED_ACIN;
 extern struct Gpio __code LED_PWR;
 extern struct Gpio __code LID_SW_N;

src/board/system76/lemp9/include/board/tcpm.h

@@ -0,0 +1,11 @@
+#ifndef _BOARD_TCPM_H
+#define _BOARD_TCPM_H
+
+#include <ec/smbus.h>
+
+void tcpm_init(void);
+int tcpm_read(uint8_t address, uint8_t command, uint16_t * data);
+int tcpm_write(uint8_t address, uint8_t command, uint16_t data);
+void tcpm_event(void);
+
+#endif // _BOARD_TCPM_H

src/board/system76/lemp9/main.c

@@ -18,6 +18,7 @@
 #include <board/ps2.h>
 #include <board/pwm.h>
 #include <board/smbus.h>
+#include <board/tcpm.h>
 #include <common/debug.h>
 #include <common/macro.h>
 
@@ -47,6 +48,7 @@ void init(void) {
     pmc_init();
     pwm_init();
     smbus_init();
+    tcpm_init();
 
     //TODO: INTC
 }
@@ -112,6 +114,8 @@ void main(void) {
             peci_event();
             // Updates battery status
             battery_event();
+            // Updates type-c port
+            tcpm_event();
         }
         // Handles ACPI communication
         pmc_event(&PMC_1);

src/board/system76/lemp9/tcpm.c

@@ -0,0 +1,23 @@
+#include <board/gpio.h>
+#include <board/tcpm.h>
+#include <ec/i2c.h>
+
+void tcpm_init(void) {
+    // Set up for i2c usage
+    i2c_reset(&I2C_TCPM, true);
+
+    // Enable connection to TCPC
+    *(EC_SMD_EN_N.control) = GPIO_OUT;
+}
+
+int tcpm_read(uint8_t address, uint8_t command, uint16_t * data) {
+    return i2c_get(&I2C_TCPM, address, command, (uint8_t *)data, 2);
+}
+
+int tcpm_write(uint8_t address, uint8_t command, uint16_t data) {
+    return i2c_set(&I2C_TCPM, address, command, (uint8_t *)&data, 2);
+}
+
+void tcpm_event(void) {
+    //TODO
+}