iw: add patch for setting coverage class / distance

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19140 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 81 insertions, 0 deletions

diff --git a/package/iw/patches/100-coverage_class.patch b/package/iw/patches/100-coverage_class.patch
new file mode 100644
index 0000000000..8e18e038d6
--- /dev/null
+++ b/package/iw/patches/100-coverage_class.patch
@@ -0,0 +1,81 @@
+--- a/info.c
++++ b/info.c
+@@ -156,6 +156,14 @@ static int print_phy_handler(struct nl_m
+ 			printf("\tRTS threshold: %d\n", rts);
+ 	}
+ 
++	if (tb_msg[NL80211_ATTR_WIPHY_COVERAGE_CLASS]) {
++		unsigned char coverage;
++
++		coverage = nla_get_u8(tb_msg[NL80211_ATTR_WIPHY_COVERAGE_CLASS]);
++		/* See handle_distance() for an explanation where the '450' comes from */
++		printf("\tCoverage class: %d (up to %dm)\n", coverage, 450 * coverage);
++	}
++
+ 	if (!tb_msg[NL80211_ATTR_SUPPORTED_IFTYPES])
+ 		goto commands;
+ 
+--- a/phy.c
++++ b/phy.c
+@@ -164,3 +164,61 @@ static int handle_netns(struct nl80211_s
+ COMMAND(set, netns, "<pid>",
+ 	NL80211_CMD_SET_WIPHY_NETNS, 0, CIB_PHY, handle_netns,
+ 	"Put this wireless device into a different network namespace");
++
++static int handle_coverage(struct nl80211_state *state,
++			struct nl_cb *cb,
++			struct nl_msg *msg,
++			int argc, char **argv)
++{
++	unsigned int coverage;
++
++	if (argc != 1)
++		return 1;
++
++	coverage = strtoul(argv[0], NULL, 10);
++	if (coverage > 255)
++		return 1;
++	
++	NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_COVERAGE_CLASS, coverage);
++
++	return 0;
++ nla_put_failure:
++	return -ENOBUFS;
++}
++COMMAND(set, coverage, "<coverage class>",
++	NL80211_CMD_SET_WIPHY, 0, CIB_PHY, handle_coverage,
++	"Set coverage class (1 for every 3 usec of air propagation time).\n"
++	"Valid values: 0 - 255.");
++
++static int handle_distance(struct nl80211_state *state,
++			struct nl_cb *cb,
++			struct nl_msg *msg,
++			int argc, char **argv)
++{
++	unsigned int distance, coverage;
++
++	if (argc != 1)
++		return 1;
++
++	distance = strtoul(argv[0], NULL, 10);
++	
++	/*
++	 * Divide double the distance by the speed of light in m/usec (300) to
++	 * get round-trip time in microseconds and then divide the result by
++	 * three to get coverage class as specified in IEEE 802.11-2007 table
++	 * 7-27. Values are rounded upwards.
++	 */
++	coverage = (distance + 449) / 450;
++	if (coverage > 255)
++		return 1;
++	
++	NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_COVERAGE_CLASS, coverage);
++
++	return 0;
++ nla_put_failure:
++	return -ENOBUFS;
++}
++COMMAND(set, distance, "<distance>",
++	NL80211_CMD_SET_WIPHY, 0, CIB_PHY, handle_distance,
++	"Set appropriate coverage class for given link distance in meters.\n"
++	"Valid values: 0 - 114750");