Hi,
I am having a hard time understanding the
nature of the "echo cape-bone-iio >
/sys/devices/bone_capemgr.*/slots"
I have written the following program in Go:
package bbbdevtreeovly
import (
//
"io"
//
"bytes"
//
"fmt"
"io/ioutil"
"log"
"os"
//
"os/exec"
//
"strings"
"path/filepath"
)
const (
slotsDir
string = `/sys/devices/` // Find BBB's slots
)
func Load_dto(dtoFileName string, dtoFilePath
string) (err error) {
log.SetPrefix(`BBB
Device Tree Overlay: `)
slotFiles
:= make([]os.FileInfo, 100)
slotFiles,
err = ioutil.ReadDir(slotsDir)
var i
int
for i
= 0; i < len(slotFiles); i++ {
found,
_ := filepath.Match(`bone_capemgr.*`,
slotFiles[i].Name())
if
found {
break
}
}
log.Println("This
is the new program...", "\n")
slotsLoc
:= filepath.Join(slotsDir, slotFiles[i].Name(),
`slots`)
log.Println("DTO
File: ", dtoFileName, "\n")
slots,
err := os.Open(slotsLoc)
if err
!= nil {
log.Println(err)
return
err
}
defer
slots.Close()
log.Println("Slots
location: ", slots.Name(), "\n")
slots.Write([]byte(dtoFileName))
//
slots.Write([]byte("cape_bone_iio"))
return
nil
}
/*
*
*/
package main
import (
"davidsonff/fmserve/bbbdevtreeovly"
"fmt"
)
func main() {
err :=
bbbdevtreeovly.Load_dto("cape-bone-iio",
"/lib/firmware/")
if err
!= nil {
panic(err)
}
fmt.Println("Success!")
}
The result is no error and no change in the
system:
root@beaglebone:~# ./fmserve
BBB Device Tree Overlay: 2013/12/15 19:25:15
This is the new program...
BBB Device Tree Overlay: 2013/12/15 19:25:15
DTO File: cape-bone-iio
BBB Device Tree Overlay: 2013/12/15 19:25:15
Slots location: /sys/devices/bone_capemgr.9/slots
Success!
root@beaglebone:~# cat
/sys/devices/bone_capemgr.9/slots
0: 54:PF---
1: 55:PF---
2: 56:PF---
3: 57:PF---
4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas
Instrument,BB-BONE-EMMC-2G
5: ff:P-O-L Bone-Black-HDMI,00A0,Texas
Instrument,BB-BONELT-HDMI
It seems to me that the $SLOTS "file" is not a
normal file and that I am not understanding it
properly.
I've seen posts on loading this at boot in a
script file, but nothing about changing it
programmatically... Any help would be appreciated!
Thanks,
Frank
