cmd: log: Add commands to list categories and drivers

This allows users to query which categories and drivers are available on
their system. This allows them to construct filter-add commands without
(e.g.) adjusting the log format to show categories and drivers.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/cmd/log.c b/cmd/log.c
index 651e503..8d8d8a8 100644 (file)
--- a/cmd/log.c
+++ b/cmd/log.c
@@ -47,6 +47,37 @@ static int do_log_level(struct cmd_tbl *cmdtp, int flag, int argc,
        return CMD_RET_SUCCESS;
 }
 
+static int do_log_categories(struct cmd_tbl *cmdtp, int flag, int argc,
+                            char *const argv[])
+{
+       enum log_category_t cat;
+       const char *name;
+
+       for (cat = LOGC_FIRST; cat < LOGC_COUNT; cat++) {
+               name = log_get_cat_name(cat);
+               /*
+                * Invalid category names (e.g. <invalid> or <missing>) begin
+                * with '<'.
+                */
+               if (name[0] == '<')
+                       continue;
+               printf("%s\n", name);
+       }
+
+       return CMD_RET_SUCCESS;
+}
+
+static int do_log_drivers(struct cmd_tbl *cmdtp, int flag, int argc,
+                         char *const argv[])
+{
+       struct log_device *ldev;
+
+       list_for_each_entry(ldev, &gd->log_head, sibling_node)
+               printf("%s\n", ldev->drv->name);
+
+       return CMD_RET_SUCCESS;
+}
+
 static int do_log_format(struct cmd_tbl *cmdtp, int flag, int argc,
                         char *const argv[])
 {
@@ -123,6 +154,8 @@ static int do_log_rec(struct cmd_tbl *cmdtp, int flag, int argc,
 #ifdef CONFIG_SYS_LONGHELP
 static char log_help_text[] =
        "level - get/set log level\n"
+       "categories - list log categories\n"
+       "drivers - list log drivers\n"
        "log format <fmt> - set log output format. <fmt> is a string where\n"
        "\teach letter indicates something that should be displayed:\n"
        "\tc=category, l=level, F=file, L=line number, f=function, m=msg\n"
@@ -134,6 +167,8 @@ static char log_help_text[] =
 
 U_BOOT_CMD_WITH_SUBCMDS(log, "log system", log_help_text,
        U_BOOT_SUBCMD_MKENT(level, 2, 1, do_log_level),
+       U_BOOT_SUBCMD_MKENT(categories, 1, 1, do_log_categories),
+       U_BOOT_SUBCMD_MKENT(drivers, 1, 1, do_log_drivers),
        U_BOOT_SUBCMD_MKENT(format, 2, 1, do_log_format),
        U_BOOT_SUBCMD_MKENT(rec, 7, 1, do_log_rec),
 );

diff --git a/include/log.h b/include/log.h
index 94ac729..745e774 100644 (file)
--- a/include/log.h
+++ b/include/log.h
@@ -411,8 +411,9 @@ struct log_filter {
  * log_get_cat_name() - Get the name of a category
  *
  * @cat: Category to look up
- * @return category name (which may be a uclass driver name) if found, or
- *      "<invalid>" if invalid, or "<missing>" if not found
+ * @return: category name (which may be a uclass driver name) if found, or
+ *        "<invalid>" if invalid, or "<missing>" if not found. All error
+ *        responses begin with '<'.
  */
 const char *log_get_cat_name(enum log_category_t cat);