more streamlining

host/describe.go

@@ -1,28 +0,0 @@
-package host
-
-import (
-	"errors"
-
-	"github.com/kidoman/embd/gpio"
-	"github.com/kidoman/embd/host/rpi"
-	"github.com/kidoman/embd/i2c"
-)
-
-type Descriptor interface {
-	GPIO() gpio.GPIO
-	I2C() i2c.I2C
-}
-
-func Describe() (Descriptor, error) {
-	host, rev, err := Detect()
-	if err != nil {
-		return nil, err
-	}
-
-	switch host {
-	case RPi:
-		return rpi.Descriptor(rev), nil
-	default:
-		return nil, errors.New("host: invalid host")
-	}
-}

host/detect.go

@@ -1,78 +0,0 @@
-package host
-
-import (
-	"fmt"
-	"os/exec"
-	"strconv"
-	"strings"
-)
-
-type Host int
-
-const (
-	Null Host = iota
-	RPi
-	BBB
-)
-
-func execOutput(name string, arg ...string) (output string, err error) {
-	var out []byte
-	if out, err = exec.Command(name, arg...).Output(); err != nil {
-		return
-	}
-	output = string(out)
-	return
-}
-
-func nodeName() (string, error) {
-	return execOutput("uname", "-n")
-}
-
-func kernelVersion() (major, minor, patch int, err error) {
-	output, err := execOutput("uname", "-r")
-	if err != nil {
-		return
-	}
-
-	parts := strings.Split(output, ".")
-
-	if major, err = strconv.Atoi(parts[0]); err != nil {
-		return
-	}
-	if minor, err = strconv.Atoi(parts[1]); err != nil {
-		return
-	}
-	if patch, err = strconv.Atoi(parts[2]); err != nil {
-		return
-	}
-
-	return
-}
-
-func Detect() (host Host, rev int, err error) {
-	major, minor, patch, err := kernelVersion()
-	if err != nil {
-		return
-	}
-
-	if major < 3 || (major == 3 && minor < 8) {
-		err = fmt.Errorf("embd: linux kernel versions lower than 3.8 are not supported. you have %v.%v.%v", major, minor, patch)
-		return
-	}
-
-	node, err := nodeName()
-	if err != nil {
-		return
-	}
-
-	switch node {
-	case "raspberrypi":
-		host = RPi
-	case "beaglebone":
-		host = BBB
-	default:
-		err = fmt.Errorf("embd: your host %q is not supported at this moment. please request support at https://github.com/kidoman/embd/issues", node)
-	}
-
-	return
-}