Module capsules::temperature [−] [src]

Provides userspace with access to temperature sensors.

Userspace Interface

The subscribe system call supports the single subscribe_number zero, which is used to provide a callback that will return back the result of a temperature sensor reading. The subscribecall return codes indicate the following:

SUCCESS: the callback been successfully been configured.
ENOSUPPORT: Invalid allow_num.
ENOMEM: No sufficient memory available.
EINVAL: Invalid address of the buffer or other error.

`command` System Call

The command system call support one argument cmd which is used to specify the specific operation, currently the following cmd's are supported:

0: check whether the driver exist
1: read the temperature

The possible return from the 'command' system call indicates the following:

SUCCESS: The operation has been successful.
EBUSY: The driver is busy.
ENOSUPPORT: Invalid cmd.
ENOMEM: No sufficient memory available.
EINVAL: Invalid address of the buffer or other error.

Usage

You need a device that provides the hil::sensors::TemperatureDriver trait.

let temp = static_init!(
       capsules::temperature::TemperatureSensor<'static>,
       capsules::temperature::TemperatureSensor::new(si7021,
                                                kernel::Grant::create()), 96/8);
kernel::hil::sensors::TemperatureDriver::set_client(si7021, temp);