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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>
This commit is contained in:
Larry Finger 2008-12-03 22:21:20 -06:00 committed by John W. Linville
parent 7a3c66e2d3
commit a7db74f4be
1 changed files with 15 additions and 34 deletions
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49
drivers/net/wireless/rtl818x/rtl8187_dev.c
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@ -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