X-Git-Url: https://git.archive.openwrt.org/?p=project%2Fluci.git;a=blobdiff_plain;f=libs%2Fsys%2Fluasrc%2Fsys.lua;h=3412b32b703983397bd59f91df210521ae16af94;hp=3e2ce7f3194ad16f99d866100eb706d047d701b7;hb=98996e380a7301ec5127de83e047d0bf8cf3df43;hpb=4b9f7db1cea69524ca46098b446b0fe51e87091b;ds=sidebyside

diff --git a/libs/sys/luasrc/sys.lua b/libs/sys/luasrc/sys.lua
index 3e2ce7f31..3412b32b7 100644
--- a/libs/sys/luasrc/sys.lua
+++ b/libs/sys/luasrc/sys.lua
@@ -35,7 +35,8 @@ luci.util   = require "luci.util"
 luci.fs     = require "luci.fs"
 luci.ip     = require "luci.ip"
 
-local tonumber, ipairs, pairs, pcall = tonumber, ipairs, pairs, pcall
+local tonumber, ipairs, pairs, pcall, type =
+	tonumber, ipairs, pairs, pcall, type
 
 
 --- LuCI Linux and POSIX system utilities.
@@ -680,6 +681,36 @@ function wifi.iwscan(iface)
 	return iface and (iws[iface] or {}) or iws
 end
 
+--- Get available channels from given wireless iface.
+-- @param iface	Wireless interface (optional)
+-- @return		Table of available channels
+function wifi.channels(iface)
+	local cmd = "iwlist " .. ( iface or "" ) .. " freq 2>/dev/null"
+	local cns = { }
+
+	local fd = io.popen(cmd)
+	if fd then
+		local ln, c, f
+		repeat
+			ln = fd:read("*l") or ""
+			c, f = ln:match("Channel (%d+) : (%d+%.%d+) GHz")
+			if c and f then
+				cns[tonumber(c)] = tonumber(f)
+			end
+		until not ( #ln > 0 )
+		fd:close()
+	end
+
+	if #cns == 0 then
+		cms = {
+			2.412, 2.417, 2.422, 2.427, 2.432, 2.437,
+			2.442, 2.447, 2.452, 2.457, 2.462
+		}
+	end
+
+	return cns
+end
+
 
 --- LuCI system utilities / init related functions.
 -- @class	module