add wl0_txpwr setting to wificonf

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@2528 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 64 insertions, 0 deletions

diff --git a/package/wificonf/wificonf.c b/package/wificonf/wificonf.c
index f5f43f1b3..a93bba3ed 100644
--- a/package/wificonf/wificonf.c
+++ b/package/wificonf/wificonf.c
@@ -112,6 +112,64 @@ static int nvram_disabled(char *name)
 }
 
 
+/* Quarter dBm units to mW
+ * Table starts at QDBM_OFFSET, so the first entry is mW for qdBm=153
+ * Table is offset so the last entry is largest mW value that fits in
+ * a uint16.
+ */
+
+#define QDBM_OFFSET 153
+#define QDBM_TABLE_LEN 40
+
+/* Smallest mW value that will round up to the first table entry, QDBM_OFFSET.
+ * Value is ( mW(QDBM_OFFSET - 1) + mW(QDBM_OFFSET) ) / 2
+ */
+#define QDBM_TABLE_LOW_BOUND 6493
+
+/* Largest mW value that will round down to the last table entry,
+ * QDBM_OFFSET + QDBM_TABLE_LEN-1.
+ * Value is ( mW(QDBM_OFFSET + QDBM_TABLE_LEN - 1) + mW(QDBM_OFFSET + QDBM_TABLE_LEN) ) / 2.
+ */
+#define QDBM_TABLE_HIGH_BOUND 64938
+
+static const uint16 nqdBm_to_mW_map[QDBM_TABLE_LEN] = {
+/* qdBm:        +0		+1		+2		+3		+4		+5		+6		+7	*/
+/* 153: */      6683,	7079,	7499,	7943,	8414,	8913,	9441,	10000,
+/* 161: */      10593,	11220,	11885,	12589,	13335,	14125,	14962,	15849,
+/* 169: */      16788,	17783,	18836,	19953,	21135,	22387,	23714,	25119,
+/* 177: */      26607,	28184,	29854,	31623,	33497,	35481,	37584,	39811,
+/* 185: */      42170,	44668,	47315,	50119,	53088,	56234,	59566,	63096
+};
+
+unsigned char mw_to_qdbm(uint16 mw)
+{
+	char qdbm;
+	int offset;
+	uint mw_uint = mw;
+	uint boundary;
+	
+	/* handle boundary case */
+	if (mw_uint <= 1)
+		return 0;
+	
+	offset = QDBM_OFFSET;
+	
+	/* move mw into the range of the table */
+	while (mw_uint < QDBM_TABLE_LOW_BOUND) {
+		mw_uint *= 10;
+		offset -= 40;
+	}
+
+	for (qdbm = 0; qdbm < QDBM_TABLE_LEN-1; qdbm++) {
+		boundary = nqdBm_to_mW_map[qdbm] + (nqdBm_to_mW_map[qdbm+1] - nqdBm_to_mW_map[qdbm])/2;
+		if (mw_uint < boundary) break;
+	}
+
+	qdbm += (unsigned char)offset;
+
+	return(qdbm);
+}
+
 static int bcom_ioctl(int skfd, char *ifname, int cmd, void *buf, int len)
 {
 	struct ifreq ifr;
@@ -523,6 +581,12 @@ static void setup_bcom_common(int skfd, char *ifname)
 	buf[3] = 0;
 	bcom_ioctl(skfd, ifname, WLC_SET_COUNTRY, buf, 4);
 	
+	if (v = nvram_get(wl_var("txpwr"))) {
+		val = atoi(v);
+		val = mw_to_qdbm(val);
+		bcom_set_int(skfd, ifname, "qtxpower", val);
+	}
+	
 	/* Set other options */
 	val = nvram_enabled(wl_var("lazywds"));
 	bcom_ioctl(skfd, ifname, WLC_SET_LAZYWDS, &val, sizeof(val));