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package/base-files: add caldata_sysfsload_from_file()

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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>
This commit is contained in:
Thibaut VARÈNE 2020-04-20 13:48:02 +02:00 committed by Koen Vandeputte
parent 8f4735297b
commit 02a9d3d6a9
2 changed files with 16 additions and 1 deletions
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2
package/base-files/Makefile
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@ -12,7 +12,7 @@ include $(INCLUDE_DIR)/version.mk
include $(INCLUDE_DIR)/feeds.mk
PKG_NAME:=base-files
PKG_RELEASE:=219
PKG_RELEASE:=220
PKG_FLAGS:=nonshared
PKG_FILE_DEPENDS:=$(PLATFORM_DIR)/ $(GENERIC_PLATFORM_DIR)/base-files/

15
package/base-files/files/lib/functions/caldata.sh
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@ -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