p54: power save management

This patch implements dynamic power save feature for p54.

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 43 insertions, 0 deletions

diff --git a/drivers/net/wireless/p54/p54common.c b/drivers/net/wireless/p54/p54common.c
index d85a6bafd79f..6c175df48b0d 100644
--- a/drivers/net/wireless/p54/p54common.c
+++ b/drivers/net/wireless/p54/p54common.c
@@ -1765,6 +1765,43 @@ static int p54_set_edcf(struct ieee80211_hw *dev)
         return 0;
 }
 
+static int p54_set_ps(struct ieee80211_hw *dev)
+{
+        struct p54_common *priv = dev->priv;
+        struct sk_buff *skb;
+        struct p54_psm *psm;
+        u16 mode;
+        int i;
+
+        if (dev->conf.flags & IEEE80211_CONF_PS)
+                mode = cpu_to_le16(P54_PSM | P54_PSM_DTIM | P54_PSM_MCBC);
+        else
+                mode = P54_PSM_CAM;
+
+        skb = p54_alloc_skb(dev, P54_HDR_FLAG_CONTROL_OPSET, sizeof(*psm) +
+                        sizeof(struct p54_hdr), P54_CONTROL_TYPE_PSM,
+                        GFP_ATOMIC);
+        if (!skb)
+                return -ENOMEM;
+
+        psm = (struct p54_psm *)skb_put(skb, sizeof(*psm));
+        psm->mode = cpu_to_le16(mode);
+        psm->aid = cpu_to_le16(priv->aid);
+        for (i = 0; i < ARRAY_SIZE(psm->intervals); i++) {
+                psm->intervals[i].interval =
+                        cpu_to_le16(dev->conf.listen_interval);
+                psm->intervals[i].periods = 1;
+        }
+
+        psm->beacon_rssi_skip_max = 60;
+        psm->rssi_delta_threshold = 0;
+        psm->nr = 0;
+
+        priv->tx(dev, skb);
+
+        return 0;
+}
+
 static int p54_beacon_tim(struct sk_buff *skb)
 {
         /*
@@ -1957,6 +1994,11 @@ static int p54_config(struct ieee80211_hw *dev, u32 changed)
                 if (ret)
                         goto out;
         }
+        if (changed & IEEE80211_CONF_CHANGE_PS) {
+                ret = p54_set_ps(dev);
+                if (ret)
+                        goto out;
+        }
 
 out:
         mutex_unlock(&priv->conf_mutex);
diff --git a/drivers/net/wireless/p54/p54common.h b/drivers/net/wireless/p54/p54common.h
index 035e77312484..6207323848bd 100644
--- a/drivers/net/wireless/p54/p54common.h
+++ b/drivers/net/wireless/p54/p54common.h
@@ -534,6 +534,7 @@ struct p54_psm_interval {
         __le16 periods;
 } __attribute__ ((packed));
 
+#define P54_PSM_CAM                     0
 #define P54_PSM                         BIT(0)
 #define P54_PSM_DTIM                    BIT(1)
 #define P54_PSM_MCBC                    BIT(2)