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authorSascha Hauer <s.hauer@pengutronix.de>2013-05-24 15:42:27 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2013-05-31 12:32:05 +0200
commit95e7982f99c03806b640c2e98e3e8e29ecefa3f1 (patch)
tree9549784580f7a6924c276353754162f647d4b255 /commands/detect.c
parent9897dec869bfc54f704fd07dc85800aad2e37250 (diff)
downloadbarebox-95e7982f99c03806b640c2e98e3e8e29ecefa3f1.tar.gz
devices: add detect mechanism
We often encounter the situation where slow devices should not be probed during startup since probing is slow and maybe unnecessary for unused devices. With MMC we have the 'probe' device parameter, for ata we have the same, for USB we have the 'usb' command. Overall this is not very consistent. With MMC there is the additional problem that the probe parameter is attached to the logical device when we often have the information which physical device we want to probe. This patch adds a 'detect' callback for devices and adds a command to detect devices and to list the devices which are actually detecable. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'commands/detect.c')
-rw-r--r--commands/detect.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/commands/detect.c b/commands/detect.c
new file mode 100644
index 0000000..0010a17
--- /dev/null
+++ b/commands/detect.c
@@ -0,0 +1,77 @@
+/*
+ * detect.c - detect devices command
+ *
+ * Copyright (c) 2013 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <common.h>
+#include <command.h>
+#include <complete.h>
+#include <driver.h>
+#include <getopt.h>
+
+static int do_detect(int argc, char *argv[])
+{
+ struct device_d *dev;
+ int opt, i, ret;
+ int option_list = 0;
+ int option_error = 0;
+
+ while ((opt = getopt(argc, argv, "el")) > 0) {
+ switch (opt) {
+ case 'l':
+ option_list = 1;
+ break;
+ case 'e':
+ option_error = 1;
+ break;
+ }
+ }
+
+ if (option_list) {
+ for_each_device(dev) {
+ if (dev->detect)
+ printf("%s\n", dev_name(dev));
+ }
+ return 0;
+ }
+
+ if (argc == optind)
+ return COMMAND_ERROR_USAGE;
+
+ for (i = optind; i < argc; i++) {
+ dev = get_device_by_name(argv[i]);
+ if (!dev)
+ return -ENODEV;
+ ret = device_detect(dev);
+ if (ret && option_error)
+ return ret;
+ }
+
+ return 0;
+}
+
+BAREBOX_CMD_HELP_START(detect)
+BAREBOX_CMD_HELP_USAGE("detect [OPTIONS] [devices]\n")
+BAREBOX_CMD_HELP_OPT ("-l", "list detectable devices\n")
+BAREBOX_CMD_HELP_OPT ("-e", "bail out if one device fails to detect\n")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(detect)
+ .cmd = do_detect,
+ .usage = "detect devices",
+ BAREBOX_CMD_COMPLETE(device_complete)
+ BAREBOX_CMD_HELP(cmd_detect_help)
+BAREBOX_CMD_END