[PATCH v3] v4l2-compliance: Let uvcvideo return -EACCES

[PATCH v3] v4l2-compliance: Let uvcvideo return -EACCES

[Ricardo Ribalda]

Setting a control while inactive is meant to work, but it might
not be actually written to the hardware until control becomes active.

v4l2-compliance should allow -EACCES as an error code, but only for
the uvcdriver when an attempt is made to set inactive controls.

The control framework is able to handle this case more elegantly:
it will remember the last set inactive value, and when the control
becomes active it will update the hardware. But that's really hard
to model in uvc.

Suggested-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Ricardo Ribalda <ricardo@ribalda.com>
---

v2 changelog (Thanks Hans!):

Missed case:
For the 'if (qctrl.step > 1 && qctrl.maximum > qctrl.minimum) {' section an
EACCES check is also needed (it fails there for my Logitech webcam).


 utils/v4l2-compliance/v4l2-compliance.cpp    |  2 ++
 utils/v4l2-compliance/v4l2-compliance.h      |  1 +
 utils/v4l2-compliance/v4l2-test-controls.cpp | 26 +++++++++++++++-----
 3 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/utils/v4l2-compliance/v4l2-compliance.cpp b/utils/v4l2-compliance/v4l2-compliance.cpp
index 9f71332c..1c21197b 100644
--- a/utils/v4l2-compliance/v4l2-compliance.cpp
+++ b/utils/v4l2-compliance/v4l2-compliance.cpp
@@ -84,6 +84,7 @@ bool show_colors;
 bool exit_on_fail;
 bool exit_on_warn;
 bool is_vivid;
+bool is_uvcvideo;
 int media_fd = -1;
 unsigned warnings;
 
@@ -958,6 +959,7 @@ void testNode(struct node &node, struct node &node_m2m_cap, struct node &expbuf_
 	if (node.is_v4l2()) {
 		doioctl(&node, VIDIOC_QUERYCAP, &vcap);
 		driver = reinterpret_cast<const char *>(vcap.driver);
+		is_uvcvideo = driver == "uvcvideo";
 		is_vivid = driver == "vivid";
 		if (is_vivid)
 			node.bus_info = reinterpret_cast<const char *>(vcap.bus_info);
diff --git a/utils/v4l2-compliance/v4l2-compliance.h b/utils/v4l2-compliance/v4l2-compliance.h
index 4d5c3a5c..db4790a6 100644
--- a/utils/v4l2-compliance/v4l2-compliance.h
+++ b/utils/v4l2-compliance/v4l2-compliance.h
@@ -50,6 +50,7 @@ extern bool no_progress;
 extern bool exit_on_fail;
 extern bool exit_on_warn;
 extern bool is_vivid; // We're testing the vivid driver
+extern bool is_uvcvideo; // We're testing the uvc driver
 extern int kernel_version;
 extern int media_fd;
 extern unsigned warnings;
diff --git a/utils/v4l2-compliance/v4l2-test-controls.cpp b/utils/v4l2-compliance/v4l2-test-controls.cpp
index 4be2f61c..1e8e79c3 100644
--- a/utils/v4l2-compliance/v4l2-test-controls.cpp
+++ b/utils/v4l2-compliance/v4l2-test-controls.cpp
@@ -485,6 +485,8 @@ int testSimpleControls(struct node *node)
 		} else if (ret == EILSEQ) {
 			warn("s_ctrl returned EILSEQ\n");
 			ret = 0;
+		} else if (ret == EACCES && is_uvcvideo) {
+			ret = 0;
 		} else if (ret) {
 			return fail("s_ctrl returned an error (%d)\n", ret);
 		}
@@ -498,7 +500,8 @@ int testSimpleControls(struct node *node)
 			ctrl.id = qctrl.id;
 			ctrl.value = qctrl.minimum - 1;
 			ret = doioctl(node, VIDIOC_S_CTRL, &ctrl);
-			if (ret && ret != EIO && ret != EILSEQ && ret != ERANGE)
+			if (ret && ret != EIO && ret != EILSEQ && ret != ERANGE &&
+			    !(ret == EACCES && is_uvcvideo))
 				return fail("invalid minimum range check\n");
 			if (!ret && checkSimpleCtrl(ctrl, qctrl))
 				return fail("invalid control %08x\n", qctrl.id);
@@ -508,7 +511,8 @@ int testSimpleControls(struct node *node)
 			ctrl.id = qctrl.id;
 			ctrl.value = qctrl.maximum + 1;
 			ret = doioctl(node, VIDIOC_S_CTRL, &ctrl);
-			if (ret && ret != EIO && ret != EILSEQ && ret != ERANGE)
+			if (ret && ret != EIO && ret != EILSEQ && ret != ERANGE &&
+			    !(ret == EACCES && is_uvcvideo))
 				return fail("invalid maximum range check\n");
 			if (!ret && checkSimpleCtrl(ctrl, qctrl))
 				return fail("invalid control %08x\n", qctrl.id);
@@ -521,7 +525,8 @@ int testSimpleControls(struct node *node)
 			if (ret == ERANGE)
 				warn("%s: returns ERANGE for in-range, but non-step-multiple value\n",
 						qctrl.name);
-			else if (ret && ret != EIO && ret != EILSEQ)
+			else if (ret && ret != EIO && ret != EILSEQ &&
+				 !(ret == EACCES && is_uvcvideo))
 				return fail("returns error for in-range, but non-step-multiple value\n");
 		}
 
@@ -539,6 +544,8 @@ int testSimpleControls(struct node *node)
 				ctrl.id = qctrl.id;
 				ctrl.value = i;
 				ret = doioctl(node, VIDIOC_S_CTRL, &ctrl);
+				if (valid && ret == EACCES && is_uvcvideo)
+					continue;
 				if (valid && ret)
 					return fail("could not set valid menu item %d\n", i);
 				if (!valid && !ret)
@@ -551,15 +558,18 @@ int testSimpleControls(struct node *node)
 			ctrl.id = qctrl.id;
 			ctrl.value = qctrl.minimum;
 			ret = doioctl(node, VIDIOC_S_CTRL, &ctrl);
-			if (ret && ret != EIO && ret != EILSEQ)
+			if (ret && ret != EIO && ret != EILSEQ &&
+			    !(ret == EACCES && is_uvcvideo))
 				return fail("could not set minimum value\n");
 			ctrl.value = qctrl.maximum;
 			ret = doioctl(node, VIDIOC_S_CTRL, &ctrl);
-			if (ret && ret != EIO && ret != EILSEQ)
+			if (ret && ret != EIO && ret != EILSEQ &&
+			    !(ret == EACCES && is_uvcvideo))
 				return fail("could not set maximum value\n");
 			ctrl.value = qctrl.default_value;
 			ret = doioctl(node, VIDIOC_S_CTRL, &ctrl);
-			if (ret && ret != EIO && ret != EILSEQ)
+			if (ret && ret != EIO && ret != EILSEQ &&
+			    !(ret == EACCES && is_uvcvideo))
 				return fail("could not set default value\n");
 		}
 	}
@@ -731,6 +741,8 @@ int testExtendedControls(struct node *node)
 			} else if (ret == EILSEQ) {
 				warn("s_ext_ctrls returned EILSEQ\n");
 				ret = 0;
+			} else if (ret == EACCES && is_uvcvideo) {
+				ret = 0;
 			}
 			if (ret)
 				return fail("s_ext_ctrls returned an error (%d)\n", ret);
@@ -806,6 +818,8 @@ int testExtendedControls(struct node *node)
 	} else if (ret == EILSEQ) {
 		warn("s_ext_ctrls returned EILSEQ\n");
 		ret = 0;
+	} else if (ret == EACCES && is_uvcvideo) {
+		ret = 0;
 	}
 	if (ret)
 		return fail("could not set all controls\n");
-- 
2.30.1