mirror of https://github.com/kidoman/embd
64 lines
1.8 KiB
Go
64 lines
1.8 KiB
Go
/*
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* Copyright (c) Karan Misra 2014
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
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* associated documentation files (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge, publish, distribute,
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* sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or
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* substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
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* NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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// Generic I²C driver.
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package embd
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import "sync"
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type i2cBusFactory func(byte) I2CBus
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type i2cDriver struct {
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busMap map[byte]I2CBus
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busMapLock sync.Mutex
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ibf i2cBusFactory
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}
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// NewI2CDriver returns a I2CDriver interface which allows control
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// over the I²C subsystem.
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func NewI2CDriver(ibf i2cBusFactory) I2CDriver {
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return &i2cDriver{
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busMap: make(map[byte]I2CBus),
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ibf: ibf,
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}
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}
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func (i *i2cDriver) Bus(l byte) I2CBus {
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i.busMapLock.Lock()
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defer i.busMapLock.Unlock()
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if b, ok := i.busMap[l]; ok {
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return b
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}
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b := i.ibf(l)
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i.busMap[l] = b
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return b
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}
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func (i *i2cDriver) Close() error {
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for _, b := range i.busMap {
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b.Close()
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}
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return nil
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}
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