b43: add support for setting the beacon listen interval

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43/b43.h

@@ -300,6 +300,7 @@ enum {
 #define B43_SHM_SH_LFFBLIM		0x0046	/* Long frame fallback retry limit */
 #define B43_SHM_SH_BEACPHYCTL		0x0054	/* Beacon PHY TX control word (see PHY TX control) */
 #define B43_SHM_SH_EXTNPHYCTL		0x00B0	/* Extended bytes for beacon PHY control (N) */
+#define B43_SHM_SH_BCN_LI		0x00B6	/* beacon listen interval */
 /* SHM_SHARED ACK/CTS control */
 #define B43_SHM_SH_ACKCTSPHYCTL		0x0022	/* ACK/CTS PHY control word (see PHY TX control) */
 /* SHM_SHARED probe response variables */

drivers/net/wireless/b43/main.c

@@ -3930,6 +3930,12 @@ static int b43_switch_band(struct b43_wldev *dev,
 	return 0;
 }
 
+static void b43_set_beacon_listen_interval(struct b43_wldev *dev, u16 interval)
+{
+	interval = min_t(u16, interval, (u16)0xFF);
+	b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_BCN_LI, interval);
+}
+
 /* Write the short and long frame retry limit values. */
 static void b43_set_retry_limits(struct b43_wldev *dev,
 				 unsigned int short_retry,
@@ -3958,6 +3964,9 @@ static int b43_op_config(struct ieee80211_hw *hw, u32 changed)
 	mutex_lock(&wl->mutex);
 	b43_mac_suspend(dev);
 
+	if (changed & IEEE80211_CONF_CHANGE_LISTEN_INTERVAL)
+		b43_set_beacon_listen_interval(dev, conf->listen_interval);
+
 	if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 		phy->chandef = &conf->chandef;
 		phy->channel = conf->chandef.chan->hw_value;