cfg80211: return channel noise via survey API
This patch implements the NL80211_CMD_GET_SURVEY command and an get_survey()
ops that a driver can implement. The goal of this command is to allow a
drivers to report channel survey data (e.g. channel noise, channel
occupation).
For now, only the mechanism to report back channel noise has been
implemented.
In future, there will either be a survey-trigger command --- or the existing
scan-trigger command will be enhanced. This will allow user-space to
request survey for arbitrary channels.
Note: any driver that cannot report channel noise should not report
any value at all, e.g. made-up -92 dBm.
Signed-off-by: Holger Schurig <holgerschurig@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index d2f276d..45db17f 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -160,6 +160,11 @@
* @NL80211_CMD_SCAN_ABORTED: scan was aborted, for unspecified reasons,
* partial scan results may be available
*
+ * @NL80211_CMD_GET_SURVEY: get survey resuls, e.g. channel occupation
+ * or noise level
+ * @NL80211_CMD_NEW_SURVEY_RESULTS: survey data notification (as a reply to
+ * NL80211_CMD_GET_SURVEY and on the "scan" multicast group)
+ *
* @NL80211_CMD_REG_CHANGE: indicates to userspace the regulatory domain
* has been changed and provides details of the request information
* that caused the change such as who initiated the regulatory request
@@ -341,6 +346,9 @@
NL80211_CMD_SET_WIPHY_NETNS,
+ NL80211_CMD_GET_SURVEY,
+ NL80211_CMD_NEW_SURVEY_RESULTS,
+
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
@@ -586,6 +594,10 @@
*
* @NL80211_ATTR_4ADDR: Use 4-address frames on a virtual interface
*
+ * @NL80211_ATTR_SURVEY_INFO: survey information about a channel, part of
+ * the survey response for %NL80211_CMD_GET_SURVEY, nested attribute
+ * containing info as possible, see &enum survey_info.
+ *
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
*/
@@ -718,6 +730,8 @@
NL80211_ATTR_4ADDR,
+ NL80211_ATTR_SURVEY_INFO,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@@ -1121,6 +1135,26 @@
};
/**
+ * enum nl80211_survey_info - survey information
+ *
+ * These attribute types are used with %NL80211_ATTR_SURVEY_INFO
+ * when getting information about a survey.
+ *
+ * @__NL80211_SURVEY_INFO_INVALID: attribute number 0 is reserved
+ * @NL80211_SURVEY_INFO_FREQUENCY: center frequency of channel
+ * @NL80211_SURVEY_INFO_NOISE: noise level of channel (u8, dBm)
+ */
+enum nl80211_survey_info {
+ __NL80211_SURVEY_INFO_INVALID,
+ NL80211_SURVEY_INFO_FREQUENCY,
+ NL80211_SURVEY_INFO_NOISE,
+
+ /* keep last */
+ __NL80211_SURVEY_INFO_AFTER_LAST,
+ NL80211_SURVEY_INFO_MAX = __NL80211_SURVEY_INFO_AFTER_LAST - 1
+};
+
+/**
* enum nl80211_mntr_flags - monitor configuration flags
*
* Monitor configuration flags.