carl9170: improve site survey
The firmware keeps track of channel usage. This data can
be used by the automatic channel selection to find the
*best* channel.
Survey data from wlan22
frequency: 2412 MHz [in use]
noise: -86 dBm
channel active time: 3339608 ms
channel busy time: 270982 ms
channel transmit time: 121515 ms
Survey data from wlan22
frequency: 2417 MHz
noise: -86 dBm
channel active time: 70 ms
channel busy time: 2 ms
channel transmit time: 1 ms
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/carl9170/cmd.c b/drivers/net/wireless/ath/carl9170/cmd.c
index cdfc94c..9970bf8 100644
--- a/drivers/net/wireless/ath/carl9170/cmd.c
+++ b/drivers/net/wireless/ath/carl9170/cmd.c
@@ -165,6 +165,37 @@
return __carl9170_exec_cmd(ar, cmd, true);
}
+int carl9170_collect_tally(struct ar9170 *ar)
+{
+ struct carl9170_tally_rsp tally;
+ struct survey_info *info;
+ unsigned int tick;
+ int err;
+
+ err = carl9170_exec_cmd(ar, CARL9170_CMD_TALLY, 0, NULL,
+ sizeof(tally), (u8 *)&tally);
+ if (err)
+ return err;
+
+ tick = le32_to_cpu(tally.tick);
+ if (tick) {
+ ar->tally.active += le32_to_cpu(tally.active) / tick;
+ ar->tally.cca += le32_to_cpu(tally.cca) / tick;
+ ar->tally.tx_time += le32_to_cpu(tally.tx_time) / tick;
+ ar->tally.rx_total += le32_to_cpu(tally.rx_total);
+ ar->tally.rx_overrun += le32_to_cpu(tally.rx_overrun);
+
+ if (ar->channel) {
+ info = &ar->survey[ar->channel->hw_value];
+
+ info->channel_time = ar->tally.active / 1000;
+ info->channel_time_busy = ar->tally.cca / 1000;
+ info->channel_time_tx = ar->tally.tx_time / 1000;
+ }
+ }
+ return 0;
+}
+
int carl9170_powersave(struct ar9170 *ar, const bool ps)
{
struct carl9170_cmd *cmd;