log: Add a way to enable/disable a log device
At present all log devices are enabled by default. Add a function to allow
devices to be disabled or enabled at runtime.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/log.c b/common/log.c
index d6dfabb..1b10f6f 100644
--- a/common/log.c
+++ b/common/log.c
@@ -308,6 +308,44 @@
return -ENOENT;
}
+/**
+ * log_find_device_by_drv() - Find a device by its driver
+ *
+ * @drv: Log driver
+ * @return Device associated with that driver, or NULL if not found
+ */
+static struct log_device *log_find_device_by_drv(struct log_driver *drv)
+{
+ struct log_device *ldev;
+
+ list_for_each_entry(ldev, &gd->log_head, sibling_node) {
+ if (ldev->drv == drv)
+ return ldev;
+ }
+ /*
+ * It is quite hard to pass an invalid driver since passing an unknown
+ * LOG_GET_DRIVER(xxx) would normally produce a compilation error. But
+ * it is possible to pass NULL, for example, so this
+ */
+
+ return NULL;
+}
+
+int log_device_set_enable(struct log_driver *drv, bool enable)
+{
+ struct log_device *ldev;
+
+ ldev = log_find_device_by_drv(drv);
+ if (!ldev)
+ return -ENOENT;
+ if (enable)
+ ldev->flags |= LOGDF_ENABLE;
+ else
+ ldev->flags &= ~LOGDF_ENABLE;
+
+ return 0;
+}
+
int log_init(void)
{
struct log_driver *drv = ll_entry_start(struct log_driver, log_driver);