platform.c

#include <asm-generic/errno-base.h>
#include <stdlib.h>
#define PLATFORM_FILE
#include "platform.h"

static const char* const platform_input_path = "/sys/devices/platform/asus-mcu.0/input/mode";

int init_platform(rc71l_platform_t *const platform) {
    // if (access(platform_input_path, F_OK) != 0) {
    //     fprintf(stderr, "Unable to find the MCU platform mode file %s: modes cannot be switched.\n", platform_input_path);
    //     return -ENOENT;
    // }

    // FILE* mode_file = fopen(platform_input_path, "r");
    // if (mode_file == NULL) {
    //     fprintf(stderr, "Unable to open the MCU platform mode file %s: modes cannot be switched.\n", platform_input_path);
    //     return -EINVAL;
    // }

    // char mode_str[12];
    // unsigned long read_bytes = fread((void*)&mode_str[0], 1, sizeof(mode_str), mode_file);
    // if (read_bytes < 1) {
    //     fprintf(stderr, "Unable to read the MCU platform mode file %s: no bytes.\n", platform_input_path);
    //     fclose(mode_file);
    // }

    // platform->mode = strtoul(&mode_str[0], NULL, 10);

    // fclose(mode_file);

    // printf("Asus MCU platform found: current mode %lu\n", platform->mode);
    // platform->modes_count = 3;

    return 0;
}

int cycle_mode(rc71l_platform_t *const platform) {
    char new_mode_str[] = { 
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00
    };
    
    unsigned long new_mode = (platform->mode + 1) % platform->modes_count;
    sprintf(new_mode_str, "%lu\n", new_mode);

    FILE* mode_file = fopen(platform_input_path, "w");
    if (mode_file == NULL) {
        fprintf(stderr, "Unable to open the MCU platform mode file %s: modes cannot be switched.\n", platform_input_path);
        return -1;
    }

    size_t len = strlen(new_mode_str);
    const int write_bytes = fwrite((void*)&new_mode_str[0], 1, len, mode_file);
    if (write_bytes < len) {
        fprintf(stderr, "Error writing new mode: expected to write %d bytes, %d written.\n", (int)len, (int)write_bytes);
        return -2;
    }

    platform->mode = new_mode;

    fclose(mode_file);

    return platform->mode;
}

int is_gamepad_mode(rc71l_platform_t *const platform) {
    return platform != NULL ? platform->mode == 0 : 0;
}

int is_mouse_mode(rc71l_platform_t *const platform) {
    return platform != NULL ? platform->mode == 1 : 0;
}

int is_macro_mode(rc71l_platform_t *const platform) {
    return platform != NULL ? platform->mode == 2 : 0;
}