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authorThibaut VARÈNE <hacks@slashdirt.org>2020-04-20 13:48:02 +0200
committerKoen Vandeputte <koen.vandeputte@ncentric.com>2020-05-08 15:17:17 +0200
commit02a9d3d6a932cdf707f8bcf4555d095839ce8d24 (patch)
tree8e1f51e4fc3403954c44ce516b1e51d15b0109c1 /package/base-files/files/lib
parent8f4735297bbfb24976e06bb4f2f115be29a99404 (diff)
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package/base-files: add caldata_sysfsload_from_file()
This routine enables loading caldata binary via the kernel sysfs loader See https://www.kernel.org/doc/html/v4.19/driver-api/firmware/fallback-mechanisms.html Signed-off-by: Thibaut VARÈNE <hacks@slashdirt.org>
Diffstat (limited to 'package/base-files/files/lib')
-rw-r--r--package/base-files/files/lib/functions/caldata.sh15
1 files changed, 15 insertions, 0 deletions
diff --git a/package/base-files/files/lib/functions/caldata.sh b/package/base-files/files/lib/functions/caldata.sh
index 5e969e3409..6862da7164 100644
--- a/package/base-files/files/lib/functions/caldata.sh
+++ b/package/base-files/files/lib/functions/caldata.sh
@@ -68,6 +68,21 @@ caldata_from_file() {
caldata_die "failed to extract calibration data from $source"
}
+caldata_sysfsload_from_file() {
+ local source=$1
+ local offset=$(($2))
+ local count=$(($3))
+
+ # test extract to /dev/null first
+ dd if=$source of=/dev/null iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
+ caldata_die "failed to extract calibration data from $source"
+
+ # can't fail now
+ echo 1 > /sys/$DEVPATH/loading
+ dd if=$source of=/sys/$DEVPATH/data iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null
+ echo 0 > /sys/$DEVPATH/loading
+}
+
caldata_valid() {
local expected="$1"
local target=$2