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authorLarry Finger <Larry.Finger@lwfinger.net>2008-12-03 22:21:20 -0600
committerJohn W. Linville <linville@tuxdriver.com>2008-12-12 13:48:19 -0500
commita7db74f4be3835fd16c6c582d320f692ccccc622 (patch)
tree1dfd8f6293d3db7403ba0c71001bf7c8f8dc1e9b /drivers/net/wireless
parent7a3c66e2d322c638e9306e739d96b2192dacde88 (diff)
rtl8187: Improve wireless statistics for RTL8187
The current wireless statistics for the RTL8187 poorly indicate the signal strength and quality. With testing, I found that the AGC value is inversely correlated with the strength as in the RTL8187B. By implementing a similar calculation, much more code becomes common to the two devices. Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net> Tested by: Martín Ernesto Barreyro <barreyromartin@gmail.com> Acked-by: Hin-Tak Leung <htl10@users.sourceforge.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless')
-rw-r--r--drivers/net/wireless/rtl818x/rtl8187_dev.c49
1 files changed, 15 insertions, 34 deletions
diff --git a/drivers/net/wireless/rtl818x/rtl8187_dev.c b/drivers/net/wireless/rtl818x/rtl8187_dev.c
index dbf52e8bbd7..417a2d7b576 100644
--- a/drivers/net/wireless/rtl818x/rtl8187_dev.c
+++ b/drivers/net/wireless/rtl818x/rtl8187_dev.c
@@ -313,29 +313,14 @@ static void rtl8187_rx_cb(struct urb *urb)
struct rtl8187_rx_hdr *hdr =
(typeof(hdr))(skb_tail_pointer(skb) - sizeof(*hdr));
flags = le32_to_cpu(hdr->flags);
- signal = hdr->signal & 0x7f;
+ /* As with the RTL8187B below, the AGC is used to calculate
+ * signal strength and quality. In this case, the scaling
+ * constants are derived from the output of p54usb.
+ */
+ quality = 130 - ((41 * hdr->agc) >> 6);
+ signal = -4 - ((27 * hdr->agc) >> 6);
rx_status.antenna = (hdr->signal >> 7) & 1;
- rx_status.noise = hdr->noise;
rx_status.mactime = le64_to_cpu(hdr->mac_time);
- priv->quality = signal;
- rx_status.qual = priv->quality;
- priv->noise = hdr->noise;
- rate = (flags >> 20) & 0xF;
- if (rate > 3) { /* OFDM rate */
- if (signal > 90)
- signal = 90;
- else if (signal < 25)
- signal = 25;
- signal = 90 - signal;
- } else { /* CCK rate */
- if (signal > 95)
- signal = 95;
- else if (signal < 30)
- signal = 30;
- signal = 95 - signal;
- }
- rx_status.signal = signal;
- priv->signal = signal;
} else {
struct rtl8187b_rx_hdr *hdr =
(typeof(hdr))(skb_tail_pointer(skb) - sizeof(*hdr));
@@ -353,18 +338,18 @@ static void rtl8187_rx_cb(struct urb *urb)
*/
flags = le32_to_cpu(hdr->flags);
quality = 170 - hdr->agc;
- if (quality > 100)
- quality = 100;
signal = 14 - hdr->agc / 2;
- rx_status.qual = quality;
- priv->quality = quality;
- rx_status.signal = signal;
- priv->signal = signal;
rx_status.antenna = (hdr->rssi >> 7) & 1;
rx_status.mactime = le64_to_cpu(hdr->mac_time);
- rate = (flags >> 20) & 0xF;
}
+ if (quality > 100)
+ quality = 100;
+ rx_status.qual = quality;
+ priv->quality = quality;
+ rx_status.signal = signal;
+ priv->signal = signal;
+ rate = (flags >> 20) & 0xF;
skb_trim(skb, flags & 0x0FFF);
rx_status.rate_idx = rate;
rx_status.freq = dev->conf.channel->center_freq;
@@ -1293,6 +1278,7 @@ static int __devinit rtl8187_probe(struct usb_interface *intf,
priv->mode = NL80211_IFTYPE_MONITOR;
dev->flags = IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING |
+ IEEE80211_HW_SIGNAL_DBM |
IEEE80211_HW_RX_INCLUDES_FCS;
eeprom.data = dev;
@@ -1408,13 +1394,8 @@ static int __devinit rtl8187_probe(struct usb_interface *intf,
(*channel++).hw_value = txpwr >> 8;
}
- if (priv->is_rtl8187b) {
+ if (priv->is_rtl8187b)
printk(KERN_WARNING "rtl8187: 8187B chip detected.\n");
- dev->flags |= IEEE80211_HW_SIGNAL_DBM;
- } else {
- dev->flags |= IEEE80211_HW_SIGNAL_UNSPEC;
- dev->max_signal = 65;
- }
/*
* XXX: Once this driver supports anything that requires