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authorRob Herring <rob.herring@linaro.org>2016-03-17 17:21:23 +0100
committerTom Rini <trini@konsulko.com>2016-04-01 17:17:40 -0400
commit74322201dde4593dc3194c702e95e5760e6b497a (patch)
tree5134cbb331b2883b5231a5db5e0a0ff89a5577a1
parentb745e82837e7c285fefdecfd580a343ecbd3baff (diff)
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>
-rw-r--r--drivers/usb/gadget/f_fastboot.c12
1 files 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);
}