libs/iwinfo: implement *_get_txpwrlist() to obtain valid tx power levels

9 files changed, 150 insertions, 0 deletions

diff --git a/libs/iwinfo/src/iwinfo.h b/libs/iwinfo/src/iwinfo.h
index af63183fb..be7c1ece0 100644
--- a/libs/iwinfo/src/iwinfo.h
+++ b/libs/iwinfo/src/iwinfo.h
@@ -29,5 +29,10 @@ struct iwinfo_assoclist_entry {
 	int8_t noise;
 };
 
+struct iwinfo_txpwrlist_entry {
+	uint8_t	dbm;
+	uint8_t	mw;
+};
+
 #endif
 
diff --git a/libs/iwinfo/src/iwinfo_lualib.c b/libs/iwinfo/src/iwinfo_lualib.c
index 33254637a..6974280b7 100644
--- a/libs/iwinfo/src/iwinfo_lualib.c
+++ b/libs/iwinfo/src/iwinfo_lualib.c
@@ -75,6 +75,39 @@ static int iwinfo_L_assoclist(lua_State *L, int (*func)(const char *, char *, in
 	return 1;
 }
 
+/* Wrapper for tx power list */
+static int iwinfo_L_txpwrlist(lua_State *L, int (*func)(const char *, char *, int *))
+{
+	int i, x, len;
+	char rv[IWINFO_BUFSIZE];
+	const char *ifname = luaL_checkstring(L, 1);
+	struct iwinfo_txpwrlist_entry *e;
+
+	lua_newtable(L);
+	memset(rv, 0, sizeof(rv));
+
+	if( !(*func)(ifname, rv, &len) )
+	{
+		for( i = 0, x = 1; i < len; i += sizeof(struct iwinfo_txpwrlist_entry), x++ )
+		{
+			e = (struct iwinfo_txpwrlist_entry *) &rv[i];
+
+			lua_pushinteger(L, x);
+			lua_newtable(L);
+
+			lua_pushnumber(L, e->mw);
+			lua_setfield(L, -2, "mw");
+			
+			lua_pushnumber(L, e->dbm);
+			lua_setfield(L, -2, "dbm");
+
+			lua_settable(L, -3);
+		}
+	}
+
+	return 1;
+}
+
 /* Broadcom */
 LUA_WRAP_INT(wl,channel)
 LUA_WRAP_INT(wl,frequency)
@@ -89,6 +122,7 @@ LUA_WRAP_STRING(wl,ssid)
 LUA_WRAP_STRING(wl,bssid)
 LUA_WRAP_STRING(wl,enctype)
 LUA_WRAP_ASSOCLIST(wl)
+LUA_WRAP_TXPWRLIST(wl)
 
 /* Madwifi */
 LUA_WRAP_INT(madwifi,channel)
@@ -104,6 +138,7 @@ LUA_WRAP_STRING(madwifi,ssid)
 LUA_WRAP_STRING(madwifi,bssid)
 LUA_WRAP_STRING(madwifi,enctype)
 LUA_WRAP_ASSOCLIST(madwifi)
+LUA_WRAP_TXPWRLIST(madwifi)
 
 /* Wext */
 LUA_WRAP_INT(wext,channel)
@@ -119,6 +154,7 @@ LUA_WRAP_STRING(wext,ssid)
 LUA_WRAP_STRING(wext,bssid)
 LUA_WRAP_STRING(wext,enctype)
 LUA_WRAP_ASSOCLIST(wext)
+LUA_WRAP_TXPWRLIST(wext)
 
 /* Broadcom table */
 static const luaL_reg R_wl[] = {
@@ -134,6 +170,7 @@ static const luaL_reg R_wl[] = {
 	LUA_REG(wl,bssid),
 	LUA_REG(wl,enctype),
 	LUA_REG(wl,assoclist),
+	LUA_REG(wl,txpwrlist),
 	LUA_REG(wl,mbssid_support),
 	{ NULL, NULL }
 };
@@ -152,6 +189,7 @@ static const luaL_reg R_madwifi[] = {
 	LUA_REG(madwifi,bssid),
 	LUA_REG(madwifi,enctype),
 	LUA_REG(madwifi,assoclist),
+	LUA_REG(madwifi,txpwrlist),
 	LUA_REG(madwifi,mbssid_support),
 	{ NULL, NULL }
 };
@@ -170,6 +208,7 @@ static const luaL_reg R_wext[] = {
 	LUA_REG(wext,bssid),
 	LUA_REG(wext,enctype),
 	LUA_REG(wext,assoclist),
+	LUA_REG(wext,txpwrlist),
 	LUA_REG(wext,mbssid_support),
 	{ NULL, NULL }
 };
diff --git a/libs/iwinfo/src/iwinfo_lualib.h b/libs/iwinfo/src/iwinfo_lualib.h
index ca1a4421c..909080bb4 100644
--- a/libs/iwinfo/src/iwinfo_lualib.h
+++ b/libs/iwinfo/src/iwinfo_lualib.h
@@ -66,5 +66,12 @@
 			type##_get_assoclist);						\
 	}
 
+#define LUA_WRAP_TXPWRLIST(type)						\
+	static int iwinfo_L_##type##_txpwrlist(lua_State *L)\
+	{													\
+		return iwinfo_L_txpwrlist(L,					\
+			type##_get_txpwrlist);						\
+	}
+
 #endif
 
diff --git a/libs/iwinfo/src/iwinfo_madwifi.c b/libs/iwinfo/src/iwinfo_madwifi.c
index 17db10b3f..11650129c 100644
--- a/libs/iwinfo/src/iwinfo_madwifi.c
+++ b/libs/iwinfo/src/iwinfo_madwifi.c
@@ -398,6 +398,11 @@ int madwifi_get_assoclist(const char *ifname, char *buf, int *len)
 	return -1;
 }
 
+int madwifi_get_txpwrlist(const char *ifname, char *buf, int *len)
+{
+	return wext_get_txpwrlist(ifname, buf, len);
+}
+
 int madwifi_get_mbssid_support(const char *ifname, int *buf)
 {
 	/* We assume that multi bssid is always possible */
diff --git a/libs/iwinfo/src/iwinfo_madwifi.h b/libs/iwinfo/src/iwinfo_madwifi.h
index 15fe72f8a..24573f3b8 100644
--- a/libs/iwinfo/src/iwinfo_madwifi.h
+++ b/libs/iwinfo/src/iwinfo_madwifi.h
@@ -35,6 +35,7 @@ int madwifi_get_quality(const char *ifname, int *buf);
 int madwifi_get_quality_max(const char *ifname, int *buf);
 int madwifi_get_enctype(const char *ifname, char *buf);
 int madwifi_get_assoclist(const char *ifname, char *buf, int *len);
+int madwifi_get_txpwrlist(const char *ifname, char *buf, int *len);
 int madwifi_get_mbssid_support(const char *ifname, int *buf);
 
 #endif
diff --git a/libs/iwinfo/src/iwinfo_wext.c b/libs/iwinfo/src/iwinfo_wext.c
index 859bb1f1d..24be10fa9 100644
--- a/libs/iwinfo/src/iwinfo_wext.c
+++ b/libs/iwinfo/src/iwinfo_wext.c
@@ -22,6 +22,8 @@
 #include "iwinfo.h"
 #include "iwinfo_wext.h"
 
+#define LOG10_MAGIC	1.25892541179
+
 static int ioctl_socket = -1;
 
 static double wext_freq2float(const struct iw_freq *in)
@@ -50,6 +52,39 @@ static int wext_freq2mhz(const struct iw_freq *in)
 	}
 }
 
+static int wext_dbm2mw(int in)
+{
+	double res = 1.0;
+	int ip = in / 10;
+	int fp = in % 10;
+	int k;
+
+	for(k = 0; k < ip; k++) res *= 10;
+	for(k = 0; k < fp; k++) res *= LOG10_MAGIC;
+
+	return (int)res;
+}
+
+static int wext_mw2dbm(int in)
+{
+	double fin = (double) in;
+	int res = 0;
+
+	while(fin > 10.0)
+	{
+		res += 10;
+		fin /= 10.0;
+	}
+
+	while(fin > 1.000001)
+	{
+		res += 1;
+		fin /= LOG10_MAGIC;
+	}
+
+	return res;
+}
+
 static int wext_ioctl(const char *ifname, int cmd, struct iwreq *wrq)
 {
 	/* prepare socket */
@@ -297,6 +332,44 @@ int wext_get_assoclist(const char *ifname, char *buf, int *len)
 	return -1;
 }
 
+int wext_get_txpwrlist(const char *ifname, char *buf, int *len)
+{
+	struct iwreq wrq;
+	struct iw_range range;
+	struct iwinfo_txpwrlist_entry entry;
+	int i;
+
+	wrq.u.data.pointer = (caddr_t) &range;
+	wrq.u.data.length  = sizeof(struct iw_range);
+	wrq.u.data.flags   = 0;
+
+	if( (wext_ioctl(ifname, SIOCGIWRANGE, &wrq) >= 0) &&
+	    (range.num_txpower > 0) && (range.num_txpower <= IW_MAX_TXPOWER) &&
+	    !(range.txpower_capa & IW_TXPOW_RELATIVE)
+	) {
+		for( i = 0; i < range.num_txpower; i++ )
+		{
+			if( range.txpower_capa & IW_TXPOW_MWATT )
+			{
+				entry.dbm = wext_mw2dbm(range.txpower[i]);
+				entry.mw  = range.txpower[i];
+			}
+			else
+			{
+				entry.dbm = range.txpower[i];
+				entry.mw  = wext_dbm2mw(range.txpower[i]);
+			}
+
+			memcpy(&buf[i*sizeof(entry)], &entry, sizeof(entry));
+		}
+
+		*len = i * sizeof(entry);
+		return 0;
+	}
+
+	return -1;	
+}
+
 int wext_get_mbssid_support(const char *ifname, int *buf)
 {
 	/* No multi bssid support atm */
diff --git a/libs/iwinfo/src/iwinfo_wext.h b/libs/iwinfo/src/iwinfo_wext.h
index 7ff6cfb7d..906b9324d 100644
--- a/libs/iwinfo/src/iwinfo_wext.h
+++ b/libs/iwinfo/src/iwinfo_wext.h
@@ -35,6 +35,7 @@ int wext_get_quality(const char *ifname, int *buf);
 int wext_get_quality_max(const char *ifname, int *buf);
 int wext_get_enctype(const char *ifname, char *buf);
 int wext_get_assoclist(const char *ifname, char *buf, int *len);
+int wext_get_txpwrlist(const char *ifname, char *buf, int *len);
 int wext_get_mbssid_support(const char *ifname, int *buf);
 
 #endif
diff --git a/libs/iwinfo/src/iwinfo_wl.c b/libs/iwinfo/src/iwinfo_wl.c
index 4247353f5..2c3126a83 100644
--- a/libs/iwinfo/src/iwinfo_wl.c
+++ b/libs/iwinfo/src/iwinfo_wl.c
@@ -366,6 +366,24 @@ int wl_get_assoclist(const char *ifname, char *buf, int *len)
 	return -1;
 }
 
+int wl_get_txpwrlist(const char *ifname, char *buf, int *len)
+{
+	struct iwinfo_txpwrlist_entry entry;
+	uint8_t dbm[8] = { 0, 6, 8, 10, 12, 14, 16, 18 };
+	uint8_t mw[8]  = { 1, 3, 6, 10, 15, 25, 39, 63 };
+	int i;
+
+	for( i = 0; i < 8; i++ )
+	{
+		entry.dbm = dbm[i];
+		entry.mw  = mw[i];
+		memcpy(&buf[i*sizeof(entry)], &entry, sizeof(entry));
+	}
+
+	*len = 8 * sizeof(entry);
+	return 0;
+}
+
 int wl_get_mbssid_support(const char *ifname, int *buf)
 {
 	wlc_rev_info_t revinfo;
diff --git a/libs/iwinfo/src/iwinfo_wl.h b/libs/iwinfo/src/iwinfo_wl.h
index 8ae791758..1bee4f950 100644
--- a/libs/iwinfo/src/iwinfo_wl.h
+++ b/libs/iwinfo/src/iwinfo_wl.h
@@ -35,6 +35,7 @@ int wl_get_quality(const char *ifname, int *buf);
 int wl_get_quality_max(const char *ifname, int *buf);
 int wl_get_enctype(const char *ifname, char *buf);
 int wl_get_assoclist(const char *ifname, char *buf, int *len);
+int wl_get_txpwrlist(const char *ifname, char *buf, int *len);
 int wl_get_mbssid_support(const char *ifname, int *buf);
 
 #endif