mirror of https://github.com/kidoman/embd
55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
// Host descriptor data structures.
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package embd
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import (
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"errors"
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"fmt"
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)
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// Descriptor represents a host descriptor.
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type Descriptor struct {
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GPIODriver func() GPIODriver
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I2CDriver func() I2CDriver
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LEDDriver func() LEDDriver
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}
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// The Describer type is a Descriptor provider.
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type Describer func(rev int) *Descriptor
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// Describers is a global list of registered host Describers.
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var describers = make(map[Host]Describer)
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func Register(host Host, describer Describer) {
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if describer == nil {
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panic("embd: describer is nil")
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}
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if _, dup := describers[host]; dup {
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panic("embd: describer already registered")
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}
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describers[host] = describer
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}
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// DescribeHost returns the detected host descriptor.
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func DescribeHost() (*Descriptor, error) {
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host, rev, err := DetectHost()
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if err != nil {
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return nil, err
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}
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describer, ok := describers[host]
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if !ok {
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return nil, fmt.Errorf("host: invalid host %q", host)
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}
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return describer(rev), nil
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}
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// ErrFeatureNotSupported is returned when the host does not support a
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// particular feature.
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var ErrFeatureNotSupported = errors.New("embd: requested feature is not supported")
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// ErrFeatureNotImplemented is returned when a particular feature is supported
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// by the host but not implemented yet.
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var ErrFeatureNotImplemented = errors.New("embd: requested feature is not implemented")
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