Fixed imports, bus parameter and hardcoded port

Fixed imports with goimports. Changed DetectOpts, and underlying eeprom function, to accept an open I2C bus instead. Removed hardcoded spi port in favor for spi.Port parameter.

inky/inky.go

@@ -9,14 +9,13 @@ import (
 	"fmt"
 	"image"
 	"image/color"
-	"periph.io/x/conn/v3/gpio/gpioreg"
-	"periph.io/x/conn/v3/i2c/i2creg"
-	"periph.io/x/conn/v3/spi/spireg"
 	"time"
 
 	"periph.io/x/conn/v3"
 	"periph.io/x/conn/v3/display"
 	"periph.io/x/conn/v3/gpio"
+	"periph.io/x/conn/v3/gpio/gpioreg"
+	"periph.io/x/conn/v3/i2c"
 	"periph.io/x/conn/v3/physic"
 	"periph.io/x/conn/v3/spi"
 )
@@ -114,10 +113,10 @@ type Opts struct {
 	BorderColor Color
 }
 
-// DetectOpts tries to read the device opts from EEPROM, it is recommended to use I2C bus "1"
-func DetectOpts(i2cBus string) (*Opts, error) {
+// DetectOpts tries to read the device opts from EEPROM, it is recommended to use I2C bus '1'.
+func DetectOpts(bus i2c.Bus) (*Opts, error) {
 	// Read data from EEPROM
-	data, err := readEep(i2cBus)
+	data, err := readEep(bus)
 	if err != nil {
 		return nil, fmt.Errorf("failed to detect Inky board: %v", err)
 	}
@@ -204,14 +203,10 @@ func New(p spi.Port, dc gpio.PinOut, reset gpio.PinOut, busy gpio.PinIn, o *Opts
 	return d, nil
 }
 
-// NewDetected tries to open a handle to an Inky pHat or wHAT automatically detected from EEPROM
-func NewDetected() (*Dev, error) {
-	opts, err := DetectOpts("1")
-	if err != nil {
-		return nil, err
-	}
-
-	spiPort, err := spireg.Open("SPI0.0")
+// NewDetected tries to open a handle to an Inky pHat or wHAT automatically detected from EEPROM.
+// For a Raspberry Pi running linux the SPI port will usually be 'SPI0.0' and I2C bus '1'.
+func NewDetected(port spi.Port, bus i2c.Bus) (*Dev, error) {
+	opts, err := DetectOpts(bus)
 	if err != nil {
 		return nil, err
 	}
@@ -220,7 +215,7 @@ func NewDetected() (*Dev, error) {
 	resetPin := gpioreg.ByName("27")
 	busyPin := gpioreg.ByName("17")
 
-	return New(spiPort, dcPin, resetPin, busyPin, opts)
+	return New(port, dcPin, resetPin, busyPin, opts)
 }
 
 // Dev is a handle to an Inky.
@@ -488,13 +483,7 @@ func pack(bits []bool) ([]byte, error) {
 	return ret, nil
 }
 
-func readEep(i2cBus string) ([]byte, error) {
-	bus, err := i2creg.Open(i2cBus)
-	if err != nil {
-		return nil, err
-	}
-	defer bus.Close()
-
+func readEep(bus i2c.Bus) ([]byte, error) {
 	// Inky uses SMBus, specify read registry with data
 	write := []byte{0x00, 0x00}