cfg80211 - wiphy - 1

收錄在 Ameba 的一百篇

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cfg80211 是 Linux 上 用來設定 wifi 的 API, 用來取代原本的 wireless extension.

整個架構如下:

而 struct wiphy 是 wireless hardware description

我們先寫一個最基本的如下, 看是否能跑 - github

static struct cfg80211_ops my_cfg80211_ops = {
	};

執行後會有 warn on
可以發現, wiphy_register() 會做一些設定的檢查.

至少要設定的有

(1) interface_modes
     我們先只設定一個 station mode

(2) bands
      只設定 2.4G band, 且故意 channels 寫 1~11

bit rates 這邊單位是 100Kbps

加上相關 code 之後, 執行 insmod 完, 用 iw list 可以發現有新增加的 phy#

且 bitrates / frequencies (channels) 即為所設定

Wiphy phy2
	max # scan SSIDs: 0
	max scan IEs length: 0 bytes
	max # sched scan SSIDs: 0
	max # match sets: 0
	max # scan plans: 1
	max scan plan interval: -1
	max scan plan iterations: 0
	Retry short limit: 7
	Retry long limit: 4
	Coverage class: 0 (up to 0m)
	Available Antennas: TX 0 RX 0
	Supported interface modes:
	* managed
	Band 1:
	Bitrates (non-HT):
	* 1.0 Mbps
	* 2.0 Mbps
	* 5.5 Mbps
	* 11.0 Mbps
	* 6.0 Mbps
	* 9.0 Mbps
	* 12.0 Mbps
	* 18.0 Mbps
	* 24.0 Mbps
	* 36.0 Mbps
	* 48.0 Mbps
	* 54.0 Mbps
	Frequencies:
	* 2412 MHz [1] (20.0 dBm)
	* 2417 MHz [2] (20.0 dBm)
	* 2422 MHz [3] (20.0 dBm)
	* 2427 MHz [4] (20.0 dBm)
	* 2432 MHz [5] (20.0 dBm)
	* 2437 MHz [6] (20.0 dBm)
	* 2442 MHz [7] (20.0 dBm)
	* 2447 MHz [8] (20.0 dBm)
	* 2452 MHz [9] (20.0 dBm)
	* 2457 MHz [10] (20.0 dBm)
	* 2462 MHz [11] (20.0 dBm)
	Supported commands:
	software interface modes (can always be added):
	interface combinations are not supported
	Device supports scan flush.