kselftest: alsa: Factor out check that values meet constraints

To simplify the code a bit and allow future reuse factor the checks that
values we read are valid out of test_ctl_get_value() into a separate
function which can be reused later. As part of this extend the test to
check all the values for the control, not just the first one.
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20211217130213.3893415-2-broonie@kernel.orgSigned-off-by: Takashi Iwai <tiwai@suse.de>

tools/testing/selftests/alsa/mixer-test.c

@@ -193,124 +193,147 @@ void find_controls(void)
 	snd_config_delete(config);
 }
 
-/*
- * Check that we can read the default value and it is valid. Write
- * tests use the read value to restore the default.
- */
-void test_ctl_get_value(struct ctl_data *ctl)
+bool ctl_value_index_valid(struct ctl_data *ctl, snd_ctl_elem_value_t *val,
+			   int index)
 {
-	int err;
 	long int_val;
 	long long int64_val;
 
-	/* If the control is turned off let's be polite */
-	if (snd_ctl_elem_info_is_inactive(ctl->info)) {
-		ksft_print_msg("%s is inactive\n", ctl->name);
-		ksft_test_result_skip("get_value.%d.%d\n",
-				      ctl->card->card, ctl->elem);
-		return;
-	}
-
-	/* Can't test reading on an unreadable control */
-	if (!snd_ctl_elem_info_is_readable(ctl->info)) {
-		ksft_print_msg("%s is not readable\n", ctl->name);
-		ksft_test_result_skip("get_value.%d.%d\n",
-				      ctl->card->card, ctl->elem);
-		return;
-	}
-
-	err = snd_ctl_elem_read(ctl->card->handle, ctl->def_val);
-	if (err < 0) {
-		ksft_print_msg("snd_ctl_elem_read() failed: %s\n",
-			       snd_strerror(err));
-		goto out;
-	}
-
 	switch (snd_ctl_elem_info_get_type(ctl->info)) {
 	case SND_CTL_ELEM_TYPE_NONE:
-		ksft_print_msg("%s Invalid control type NONE\n", ctl->name);
-		err = -1;
-		break;
+		ksft_print_msg("%s.%d Invalid control type NONE\n",
+			       ctl->name, index);
+		return false;
 
 	case SND_CTL_ELEM_TYPE_BOOLEAN:
-		int_val = snd_ctl_elem_value_get_boolean(ctl->def_val, 0);
+		int_val = snd_ctl_elem_value_get_boolean(val, index);
 		switch (int_val) {
 		case 0:
 		case 1:
 			break;
 		default:
-			ksft_print_msg("%s Invalid boolean value %ld\n",
-				       ctl->name, int_val);
-			err = -1;
-			break;
+			ksft_print_msg("%s.%d Invalid boolean value %ld\n",
+				       ctl->name, index, int_val);
+			return false;
 		}
 		break;
 
 	case SND_CTL_ELEM_TYPE_INTEGER:
-		int_val = snd_ctl_elem_value_get_integer(ctl->def_val, 0);
+		int_val = snd_ctl_elem_value_get_integer(val, index);
 
 		if (int_val < snd_ctl_elem_info_get_min(ctl->info)) {
-			ksft_print_msg("%s value %ld less than minimum %ld\n",
-				       ctl->name, int_val,
+			ksft_print_msg("%s.%d value %ld less than minimum %ld\n",
+				       ctl->name, index, int_val,
 				       snd_ctl_elem_info_get_min(ctl->info));
-			err = -1;
+			return false;
 		}
 
 		if (int_val > snd_ctl_elem_info_get_max(ctl->info)) {
-			ksft_print_msg("%s value %ld more than maximum %ld\n",
-				       ctl->name, int_val,
+			ksft_print_msg("%s.%d value %ld more than maximum %ld\n",
+				       ctl->name, index, int_val,
 				       snd_ctl_elem_info_get_max(ctl->info));
-			err = -1;
+			return false;
 		}
 
 		/* Only check step size if there is one and we're in bounds */
-		if (err >= 0 && snd_ctl_elem_info_get_step(ctl->info) &&
+		if (snd_ctl_elem_info_get_step(ctl->info) &&
 		    (int_val - snd_ctl_elem_info_get_min(ctl->info) %
 		     snd_ctl_elem_info_get_step(ctl->info))) {
-			ksft_print_msg("%s value %ld invalid for step %ld minimum %ld\n",
-				       ctl->name, int_val,
+			ksft_print_msg("%s.%d value %ld invalid for step %ld minimum %ld\n",
+				       ctl->name, index, int_val,
 				       snd_ctl_elem_info_get_step(ctl->info),
 				       snd_ctl_elem_info_get_min(ctl->info));
-			err = -1;
+			return false;
 		}
 		break;
 
 	case SND_CTL_ELEM_TYPE_INTEGER64:
-		int64_val = snd_ctl_elem_value_get_integer64(ctl->def_val, 0);
+		int64_val = snd_ctl_elem_value_get_integer64(val, index);
 
 		if (int64_val < snd_ctl_elem_info_get_min64(ctl->info)) {
-			ksft_print_msg("%s value %lld less than minimum %lld\n",
-				       ctl->name, int64_val,
+			ksft_print_msg("%s.%d value %lld less than minimum %lld\n",
+				       ctl->name, index, int64_val,
 				       snd_ctl_elem_info_get_min64(ctl->info));
-			err = -1;
+			return false;
 		}
 
 		if (int64_val > snd_ctl_elem_info_get_max64(ctl->info)) {
-			ksft_print_msg("%s value %lld more than maximum %lld\n",
-				       ctl->name, int64_val,
+			ksft_print_msg("%s.%d value %lld more than maximum %lld\n",
+				       ctl->name, index, int64_val,
 				       snd_ctl_elem_info_get_max(ctl->info));
-			err = -1;
+			return false;
 		}
 
 		/* Only check step size if there is one and we're in bounds */
-		if (err >= 0 && snd_ctl_elem_info_get_step64(ctl->info) &&
+		if (snd_ctl_elem_info_get_step64(ctl->info) &&
 		    (int64_val - snd_ctl_elem_info_get_min64(ctl->info)) %
 		    snd_ctl_elem_info_get_step64(ctl->info)) {
-			ksft_print_msg("%s value %lld invalid for step %lld minimum %lld\n",
-				       ctl->name, int64_val,
+			ksft_print_msg("%s.%d value %lld invalid for step %lld minimum %lld\n",
+				       ctl->name, index, int64_val,
 				       snd_ctl_elem_info_get_step64(ctl->info),
 				       snd_ctl_elem_info_get_min64(ctl->info));
-			err = -1;
+			return false;
 		}
 		break;
 
 	default:
 		/* No tests for other types */
+		break;
+	}
+
+	return true;
+}
+
+/*
+ * Check that the provided value meets the constraints for the
+ * provided control.
+ */
+bool ctl_value_valid(struct ctl_data *ctl, snd_ctl_elem_value_t *val)
+{
+	int i;
+	bool valid = true;
+
+	for (i = 0; i < snd_ctl_elem_info_get_count(ctl->info); i++)
+		if (!ctl_value_index_valid(ctl, val, i))
+			valid = false;
+
+	return valid;
+}
+
+/*
+ * Check that we can read the default value and it is valid. Write
+ * tests use the read value to restore the default.
+ */
+void test_ctl_get_value(struct ctl_data *ctl)
+{
+	int err;
+
+	/* If the control is turned off let's be polite */
+	if (snd_ctl_elem_info_is_inactive(ctl->info)) {
+		ksft_print_msg("%s is inactive\n", ctl->name);
+		ksft_test_result_skip("get_value.%d.%d\n",
+				      ctl->card->card, ctl->elem);
+		return;
+	}
+
+	/* Can't test reading on an unreadable control */
+	if (!snd_ctl_elem_info_is_readable(ctl->info)) {
+		ksft_print_msg("%s is not readable\n", ctl->name);
 		ksft_test_result_skip("get_value.%d.%d\n",
 				      ctl->card->card, ctl->elem);
 		return;
 	}
 
+	err = snd_ctl_elem_read(ctl->card->handle, ctl->def_val);
+	if (err < 0) {
+		ksft_print_msg("snd_ctl_elem_read() failed: %s\n",
+			       snd_strerror(err));
+		goto out;
+	}
+
+	if (!ctl_value_valid(ctl, ctl->def_val))
+		err = -EINVAL;
+
 out:
 	ksft_test_result(err >= 0, "get_value.%d.%d\n",
 			 ctl->card->card, ctl->elem);