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image-blob. + pub path: PathBuf, +} + +const SCREEN_W: usize = 1404; +const SCREEN_H: usize = 1872; + +const BITS_PER_PIXEL: usize = 4; +const FILE_SIZE: usize = SCREEN_W * SCREEN_H * BITS_PER_PIXEL / 8; + +// const SPI_IOC_MAGIC: u8 = b'k'; // Defined in linux/spi/spidev.h +// const SPI_IOC_TYPE_MESSAGE: u8 = 0; +// ioctl_write_buf!(spi_transfer, SPI_IOC_MAGIC, SPI_IOC_TYPE_MESSAGE, spi_ioc_transfer); +// #define DRM_IOCTL_ROCKCHIP_EBC_OFF_SCREEN DRM_IOWR(DRM_COMMAND_BASE + 0x01, struct drm_rockchip_ebc_off_screen) + +#[repr(C)] +struct DrmRockchipEbcOffScreen { + info1: u64, + ptr_screen_content: *const u8, +} + +const DRM_IOCTL_BASE: u8 = b'd'; +const DRM_COMMAND_BASE: u8 = 0x40; +const ROCKCHIP_EBC_FILE: &str = "/dev/dri/by-path/platform-fdec0000.ebc-card"; + +ioctl_write_ptr!( + set_off_screen, + DRM_IOCTL_BASE, + DRM_COMMAND_BASE + 1, + DrmRockchipEbcOffScreen +); + +fn main() -> eyre::Result<()> { + let opt = Opt::parse(); + color_eyre::install()?; + + let image = + read_file(&opt.path).wrap_err_with(|| eyre!("Failed to read file at {:?}", opt.path))?; + + let set_off_screen_data = DrmRockchipEbcOffScreen { + info1: 0, // TODO: what is this? + ptr_screen_content: image.as_ptr(), + }; + + let driver_file = File::options() + .write(true) + .open(ROCKCHIP_EBC_FILE) + .wrap_err_with(|| eyre!("Failed to open rockchip ebc file at {ROCKCHIP_EBC_FILE:?}"))?; + + unsafe { set_off_screen(driver_file.as_raw_fd(), &set_off_screen_data) } + .wrap_err("ioctl error")?; + + Ok(()) +} + +fn read_file(path: &Path) -> eyre::Result> { + let mut file = File::open(path)?; + let mut buf = vec![0u8; FILE_SIZE]; + file.read_exact(&mut buf[..]) + .wrap_err_with(|| eyre!("Expected a raw image file, of exactly {FILE_SIZE} bytes"))?; + + // Try to read a single byte. If n != 0, it means the file was larger than FILE_SIZE + let n = file.read(&mut [0u8])?; + ensure!(n == 0, "File must be exacly {FILE_SIZE} bytes long"); + + Ok(buf) +}