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cfg80211: return channel noise via survey API

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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>
This commit is contained in:
Holger Schurig 2009-11-11 12:25:40 +01:00 • committed by John W. Linville
parent a043897a31
commit 61fa713c75
3 changed files with 173 additions and 0 deletions
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34
include/linux/nl80211.h
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@ -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 @@ enum nl80211_commands {
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 @@ enum nl80211_commands {
*
* @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 @@ enum nl80211_attrs {
NL80211_ATTR_4ADDR,
NL80211_ATTR_SURVEY_INFO,
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@ -1120,6 +1134,26 @@ enum nl80211_reg_rule_flags {
NL80211_RRF_NO_IBSS = 1<<8,
};
/**
* 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
*