embd/i2cdriver.go

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// Generic I²C driver.
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package embd
import "sync"
type i2cBusFactory func(byte) I2CBus
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type i2cDriver struct {
busMap map[byte]I2CBus
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busMapLock sync.Mutex
ibf i2cBusFactory
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}
// NewI2CDriver returns a I2CDriver interface which allows control
// over the I²C subsystem.
func NewI2CDriver(ibf i2cBusFactory) I2CDriver {
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return &i2cDriver{
busMap: make(map[byte]I2CBus),
ibf: ibf,
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}
}
func (i *i2cDriver) Bus(l byte) I2CBus {
i.busMapLock.Lock()
defer i.busMapLock.Unlock()
if b, ok := i.busMap[l]; ok {
return b
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}
b := i.ibf(l)
i.busMap[l] = b
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return b
}
func (i *i2cDriver) Close() error {
for _, b := range i.busMap {
b.Close()
}
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return nil
}