/
spi_linux.go
64 lines (55 loc) · 1.32 KB
/
spi_linux.go
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// Copyright 2021 the u-root Authors. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"fmt"
"math"
"strconv"
"github.com/u-root/u-root/pkg/flash"
"github.com/u-root/u-root/pkg/spidev"
)
type spidevProgrammer struct {
*flash.Flash
spi *spidev.SPI
}
func (p *spidevProgrammer) Close() error {
return p.spi.Close()
}
func init() {
supportedProgrammers["linux_spi"] = func(params programmerParams) (programmer, error) {
dev, ok := params["dev"]
if !ok {
return nil, fmt.Errorf("dev is a required parameter for linux_spi")
}
delete(params, "dev")
spi, err := spidev.Open(dev)
if err != nil {
return nil, err
}
if spiSpeed, ok := params["spispeed"]; ok {
spiSpeedKHz, err := strconv.Atoi(spiSpeed)
if err != nil {
return nil, err
}
if spiSpeedKHz > math.MaxUint32/1000 {
return nil, fmt.Errorf("spispeed is larger than max uint32")
}
if err := spi.SetSpeedHz(uint32(spiSpeedKHz) * 1000); err != nil {
return nil, err
}
delete(params, "spispeed")
}
if len(params) != 0 {
return nil, fmt.Errorf("unrecognized parameters: %v", params)
}
f, err := flash.New(spi)
if err != nil {
return nil, err
}
return &spidevProgrammer{
Flash: f,
spi: spi,
}, nil
}
}