From 885a79f62d804229aba46822590a2a948a5aaf4e Mon Sep 17 00:00:00 2001
From: Martin Koppehel <martin@mko.dev>
Date: Thu, 1 Apr 2021 17:58:26 +0200
Subject: [PATCH] Add go modules, add possibility to query device caps

---
 device_cap.go | 45 +++++++++++++++++++++++++++++++++++++++++++--
 go.mod        |  5 +++++
 go.sum        |  2 ++
 3 files changed, 50 insertions(+), 2 deletions(-)
 create mode 100644 go.mod
 create mode 100644 go.sum

diff --git a/device_cap.go b/device_cap.go
index 44b324f..ed63c96 100644
--- a/device_cap.go
+++ b/device_cap.go
@@ -1,13 +1,15 @@
 package v4l2
 
+import "errors"
+
 // HasCapability return whether the device has a capability a particular capability.
 //
 // Example:
 //
 //	device, err := v4l2.Open(v4l2.Video17)
-//	
+//
 //	// ...
-//	
+//
 //	hasVideoCaptureCapability, err := device.HasCapability(CapabilityVideoCapture)
 func (receiver Device) HasCapability(cap uint32) (bool, error) {
 	if err := receiver.unfit(); nil != err {
@@ -33,3 +35,42 @@ func (receiver Device) MustHasCapability(cap uint32) bool {
 
 	return datum
 }
+
+
+// HasDeviceCapability return whether the device has a particular device capability.
+//
+// Example:
+//
+//	device, err := v4l2.Open(v4l2.Video17)
+//
+//	// ...
+//
+//	hasVideoCaptureCapability, err := device.HasDeviceCapability(CapabilityVideoCapture)
+func (receiver Device) HasDeviceCapability(cap uint32) (bool, error) {
+	if hasDeviceCaps, err := receiver.HasCapability(CapabilityDeviceCaps); err != nil {
+		return false, err
+	} else if !hasDeviceCaps {
+		return false, errors.New("No device caps available")
+	}
+	
+	has := 0 != (receiver.cap.deviceCaps & cap)
+	return has, nil
+}
+
+// MustHasDeviceCapability return whether the device has a particular device capability.
+//
+// Example:
+//
+//	device, err := v4l2.Open(v4l2.Video17)
+//
+//	// ...
+//
+//	hasVideoCaptureCapability, err := device.MustHasDeviceCapability(CapabilityVideoCapture)
+func (receiver Device) MustHasDeviceCapability(cap uint32) bool {
+	if hasDeviceCaps := receiver.MustHasCapability(CapabilityDeviceCaps); !hasDeviceCaps {
+		panic(errors.New("No device caps available"))
+	}
+	
+	has := 0 != (receiver.cap.deviceCaps & cap)
+	return has
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..523557d
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module github.com/reiver/go-v4l2
+
+go 1.16
+
+require golang.org/x/sys v0.0.0-20210331175145-43e1dd70ce54
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..a9c9b7f
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+golang.org/x/sys v0.0.0-20210331175145-43e1dd70ce54 h1:rF3Ohx8DRyl8h2zw9qojyLHLhrJpEMgyPOImREEryf0=
+golang.org/x/sys v0.0.0-20210331175145-43e1dd70ce54/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=