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path: root/drivers/net/wireless/rtl8187_dev.c
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Diffstat (limited to 'drivers/net/wireless/rtl8187_dev.c')
-rw-r--r--drivers/net/wireless/rtl8187_dev.c78
1 files changed, 48 insertions, 30 deletions
diff --git a/drivers/net/wireless/rtl8187_dev.c b/drivers/net/wireless/rtl8187_dev.c
index 7ff03aca251..177988efd66 100644
--- a/drivers/net/wireless/rtl8187_dev.c
+++ b/drivers/net/wireless/rtl8187_dev.c
@@ -272,6 +272,7 @@ static void rtl8187_rx_cb(struct urb *urb)
struct ieee80211_rx_status rx_status = { 0 };
int rate, signal;
u32 flags;
+ u32 quality;
spin_lock(&priv->rx_queue.lock);
if (skb->next)
@@ -295,44 +296,57 @@ static void rtl8187_rx_cb(struct urb *urb)
flags = le32_to_cpu(hdr->flags);
signal = hdr->signal & 0x7f;
rx_status.antenna = (hdr->signal >> 7) & 1;
- rx_status.signal = signal;
rx_status.noise = hdr->noise;
rx_status.mactime = le64_to_cpu(hdr->mac_time);
- priv->signal = signal;
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));
+ /* The Realtek datasheet for the RTL8187B shows that the RX
+ * header contains the following quantities: signal quality,
+ * RSSI, AGC, the received power in dB, and the measured SNR.
+ * In testing, none of these quantities show qualitative
+ * agreement with AP signal strength, except for the AGC,
+ * which is inversely proportional to the strength of the
+ * signal. In the following, the quality and signal strength
+ * are derived from the AGC. The arbitrary scaling constants
+ * are chosen to make the results close to the values obtained
+ * for a BCM4312 using b43 as the driver. The noise is ignored
+ * for now.
+ */
flags = le32_to_cpu(hdr->flags);
- signal = hdr->agc >> 1;
- rx_status.antenna = (hdr->signal >> 7) & 1;
- rx_status.signal = 64 - min(hdr->noise, (u8)64);
- rx_status.noise = hdr->noise;
+ 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);
- priv->signal = hdr->signal;
- priv->quality = hdr->agc >> 1;
- priv->noise = hdr->noise;
+ rate = (flags >> 20) & 0xF;
}
skb_trim(skb, flags & 0x0FFF);
- 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.qual = priv->quality;
- rx_status.signal = signal;
rx_status.rate_idx = rate;
rx_status.freq = dev->conf.channel->center_freq;
rx_status.band = dev->conf.channel->band;
@@ -1030,9 +1044,7 @@ static int __devinit rtl8187_probe(struct usb_interface *intf,
priv->mode = IEEE80211_IF_TYPE_MNTR;
dev->flags = IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING |
- IEEE80211_HW_RX_INCLUDES_FCS |
- IEEE80211_HW_SIGNAL_UNSPEC;
- dev->max_signal = 65;
+ IEEE80211_HW_RX_INCLUDES_FCS;
eeprom.data = dev;
eeprom.register_read = rtl8187_eeprom_register_read;
@@ -1147,10 +1159,16 @@ 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. Support "
"is EXPERIMENTAL, and could damage your\n"
" hardware, use at your own risk\n");
+ dev->flags |= IEEE80211_HW_SIGNAL_DBM;
+ } else {
+ dev->flags |= IEEE80211_HW_SIGNAL_UNSPEC;
+ dev->max_signal = 65;
+ }
+
if ((id->driver_info == DEVICE_RTL8187) && priv->is_rtl8187b)
printk(KERN_INFO "rtl8187: inconsistency between id with OEM"
" info!\n");