Struct AmbientLight

pub struct AmbientLight<'a> { /* private fields */ }

Implementations

impl<'a> AmbientLight<'a>

pub fn new( sensor: &'a dyn AmbientLight<'a>, grant: Grant<App, UpcallCount<{ upcall::COUNT }>, AllowRoCount<0>, AllowRwCount<0>>, ) -> Self

Trait Implementations

impl AmbientLightClient for AmbientLight<'_>

fn callback(&self, lux: usize)

Called when an ambient light reading has completed.

impl SyscallDriver for AmbientLight<'_>

fn command( &self, command_num: usize, _: usize, _: usize, processid: ProcessId, ) -> CommandReturn

Initiate light intensity readings

Sensor readings are coalesced if processes request them concurrently. If multiple processes request have outstanding requests for a sensor reading, only one command will be issued and the result is returned to all subscribed processes.

command_num

• 0: Check driver presence
• 1: Start a light sensor reading

fn allocate_grant(&self, processid: ProcessId) -> Result<(), Error>

Request to allocate a capsule’s grant for a specific process.

fn allow_userspace_readable( &self, app: ProcessId, which: usize, slice: ReadWriteProcessBuffer, ) -> Result<ReadWriteProcessBuffer, (ReadWriteProcessBuffer, ErrorCode)>

System call for a process to pass a buffer (a UserspaceReadableProcessBuffer) to the kernel that the kernel can either read or write. The kernel calls this method only after it checks that the entire buffer is within memory the process can both read and write.