[PATCH v2 15/22] cmd: log: Add commands to list categories and drivers

[Sean Anderson <seanga2@gmail.com>]

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>
---

Changes in v2:
- New

 cmd/log.c | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/cmd/log.c b/cmd/log.c
index 9076e220f0..ea458f36f4 100644
--- a/cmd/log.c
+++ b/cmd/log.c
@@ -47,6 +47,38 @@ 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 '<'. TODO: perhaps change the interface of
+		 * log_get_cat_name to return an error code?
+		 */
+		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 +155,8 @@ 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"
@@ -137,6 +171,8 @@ 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),
 #if CONFIG_IS_ENABLED(LOG_TEST)
-- 
2.28.0