From 74322201dde4593dc3194c702e95e5760e6b497a Mon Sep 17 00:00:00 2001
From: Rob Herring <rob.herring@linaro.org>
Date: Thu, 17 Mar 2016 17:21:23 +0100
Subject: [PATCH] fastboot: allow retrieving fastboot variables from env
Some boards need to expose device specific variable through fastboot
(to adpat the flashing script depending on hardware revision for
example).
Provide a way to expose custom fastboot variables. Note that all
variables meant to be exposed through fastboot should be be prefixed
with 'fastboot.', the variable should not exceed 32 bytes (including
the prefix and the trailing '\0') and the variable content should
fit in the response buffer (60 bytes excluding the 'OKAY' prefix and
the trailing '\0').
Signed-off-by: Rob Herring <rob.herring@linaro.org>
[Boris Brezillon: add a commit message]
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Steve Rae <srae@broadcom.com>
---
drivers/usb/gadget/f_fastboot.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/f_fastboot.c b/drivers/usb/gadget/f_fastboot.c
index a54b4eebcc..2e87feeece 100644
--- a/drivers/usb/gadget/f_fastboot.c
+++ b/drivers/usb/gadget/f_fastboot.c
@@ -413,8 +413,16 @@ static void cb_getvar(struct usb_ep *ep, struct usb_request *req)
else
strcpy(response, "FAILValue not set");
} else {
- printf("WARNING: unknown variable: %s\n", cmd);
- strcpy(response, "FAILVariable not implemented");
+ char envstr[32];
+
+ snprintf(envstr, sizeof(envstr) - 1, "fastboot.%s", cmd);
+ s = getenv(envstr);
+ if (s) {
+ strncat(response, s, chars_left);
+ } else {
+ printf("WARNING: unknown variable: %s\n", cmd);
+ strcpy(response, "FAILVariable not implemented");
+ }
}
fastboot_tx_write_str(response);
}
--
2.39.5