kernel_wireless_regdb: Add class for embedding regulatory data into older kernel

Linux kernels before v4.15, allowed to be compiled with static
regulatory database if it was put under net/wireless/db.txt.

Add kernel_wireless_regdb class which allows in such cases to embed the
wireless regulatory database directly in the Linux kernel during build
process.

Usage:
1. The class should be inherited by kernel recipe (e.g. in
   linux-yocto_%.bbappend).
2. For Linux kernels up to v4.14, build kernel with CONFIG_EXPERT and
   CONFIG_CFG80211_INTERNAL_REGDB.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/meta-networking/classes/kernel_wireless_regdb.bbclass b/meta-networking/classes/kernel_wireless_regdb.bbclass
new file mode 100644
index 000000000..1238172bd
--- /dev/null
+++ b/meta-networking/classes/kernel_wireless_regdb.bbclass
@@ -0,0 +1,20 @@
+# Linux kernels before v4.15, allowed to be compiled with static
+# regulatory database if it was put under net/wireless/db.txt.
+#
+# This class copies the regulatory plaintext database to kernel sources before
+# compiling.
+#
+# Usage:
+# 1. The class should be inherited by kernel recipe (e.g. in
+#    linux-yocto_%.bbappend).
+# 2. For Linux kernels up to v4.14, build kernel with CONFIG_EXPERT and
+#    CONFIG_CFG80211_INTERNAL_REGDB.
+
+DEPENDS += "wireless-regdb-native"
+
+SRCTREECOVEREDTASKS += "do_kernel_add_regdb"
+do_kernel_add_regdb() {
+    cp ${STAGING_LIBDIR_NATIVE}/crda/db.txt ${S}/net/wireless/db.txt
+}
+do_kernel_add_regdb[dirs] = "${S}"
+addtask kernel_add_regdb before do_build after do_configure