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path: root/drivers/net/wireless/rt2x00/rt2x00dev.c
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Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00dev.c')
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00dev.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index 7776d9f1f297..2eb5196977fd 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -141,6 +141,16 @@ static void rt2x00lib_intf_scheduled(struct work_struct *work)
rt2x00dev);
}
+static void rt2x00lib_autowakeup(struct work_struct *work)
+{
+ struct rt2x00_dev *rt2x00dev =
+ container_of(work, struct rt2x00_dev, autowakeup_work.work);
+
+ if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
+ ERROR(rt2x00dev, "Device failed to wakeup.\n");
+ clear_bit(CONFIG_POWERSAVING, &rt2x00dev->flags);
+}
+
/*
* Interrupt context handlers.
*/
@@ -416,6 +426,77 @@ void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status)
}
EXPORT_SYMBOL_GPL(rt2x00lib_txdone_noinfo);
+static u8 *rt2x00lib_find_ie(u8 *data, unsigned int len, u8 ie)
+{
+ struct ieee80211_mgmt *mgmt = (void *)data;
+ u8 *pos, *end;
+
+ pos = (u8 *)mgmt->u.beacon.variable;
+ end = data + len;
+ while (pos < end) {
+ if (pos + 2 + pos[1] > end)
+ return NULL;
+
+ if (pos[0] == ie)
+ return pos;
+
+ pos += 2 + pos[1];
+ }
+
+ return NULL;
+}
+
+static void rt2x00lib_rxdone_check_ps(struct rt2x00_dev *rt2x00dev,
+ struct sk_buff *skb,
+ struct rxdone_entry_desc *rxdesc)
+{
+ struct ieee80211_hdr *hdr = (void *) skb->data;
+ struct ieee80211_tim_ie *tim_ie;
+ u8 *tim;
+ u8 tim_len;
+ bool cam;
+
+ /* If this is not a beacon, or if mac80211 has no powersaving
+ * configured, or if the device is already in powersaving mode
+ * we can exit now. */
+ if (likely(!ieee80211_is_beacon(hdr->frame_control) ||
+ !(rt2x00dev->hw->conf.flags & IEEE80211_CONF_PS)))
+ return;
+
+ /* min. beacon length + FCS_LEN */
+ if (skb->len <= 40 + FCS_LEN)
+ return;
+
+ /* and only beacons from the associated BSSID, please */
+ if (!(rxdesc->dev_flags & RXDONE_MY_BSS) ||
+ !rt2x00dev->aid)
+ return;
+
+ rt2x00dev->last_beacon = jiffies;
+
+ tim = rt2x00lib_find_ie(skb->data, skb->len - FCS_LEN, WLAN_EID_TIM);
+ if (!tim)
+ return;
+
+ if (tim[1] < sizeof(*tim_ie))
+ return;
+
+ tim_len = tim[1];
+ tim_ie = (struct ieee80211_tim_ie *) &tim[2];
+
+ /* Check whenever the PHY can be turned off again. */
+
+ /* 1. What about buffered unicast traffic for our AID? */
+ cam = ieee80211_check_tim(tim_ie, tim_len, rt2x00dev->aid);
+
+ /* 2. Maybe the AP wants to send multicast/broadcast data? */
+ cam |= (tim_ie->bitmap_ctrl & 0x01);
+
+ if (!cam && !test_bit(CONFIG_POWERSAVING, &rt2x00dev->flags))
+ rt2x00lib_config(rt2x00dev, &rt2x00dev->hw->conf,
+ IEEE80211_CONF_CHANGE_PS);
+}
+
static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
struct rxdone_entry_desc *rxdesc)
{
@@ -531,6 +612,12 @@ void rt2x00lib_rxdone(struct queue_entry *entry)
rxdesc.flags |= RX_FLAG_HT;
/*
+ * Check if this is a beacon, and more frames have been
+ * buffered while we were in powersaving mode.
+ */
+ rt2x00lib_rxdone_check_ps(rt2x00dev, entry->skb, &rxdesc);
+
+ /*
* Update extra components
*/
rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
@@ -1017,6 +1104,7 @@ int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
}
INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);
+ INIT_DELAYED_WORK(&rt2x00dev->autowakeup_work, rt2x00lib_autowakeup);
/*
* Let the driver probe the device to detect the capabilities.