Wifi驱动加载及基本调试
- ethtool -i wlan0
driver: brcmfmac version: 7.45.154 firmware-version: 01-4fbe0b04 expansion-rom-version: bus-info: mmc1:0001:1 supports-statistics: no supports-test: no supports-eeprom-access: no supports-register-dump: no supports-priv-flags: no - brcmfmac
- /sys/bus/mmc/devices/mmc1:0001/mmc1:0001:1
- linux-rpi-4.19.y/arch/arm/boot/dts
- grep brcmf * -R | grep bcm | grep wifi
bcm2835-rpi-zero-w.dts: brcmf: wifi@1 { bcm2837-rpi-3-b.dts: brcmf: wifi@1 { bcm2837-rpi-3-b-plus.dts: brcmf: wifi@1 { bcm2838-rpi-4-b.dts: brcmf: wifi@1 {
- grep brcmf * -R | grep bcm | grep wifi
- bcm2838-rpi-4-b.dts
/* SDHCI is used to control the SDIO for wireless */ &sdhci { #address-cells = <1>; #size-cells = <0>; pinctrl-names = "default"; pinctrl-0 = <&emmc_gpio34>; status = "okay"; bus-width = <4>; non-removable; mmc-pwrseq = <&wifi_pwrseq>; brcmf: wifi@1 { reg = <1>; compatible = "brcm,bcm4329-fmac"; }; }; - net/wireless/broadcom/brcm80211/brcmfmac/of.c
void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type, struct brcmf_mp_device *settings) { struct brcmfmac_sdio_pd *sdio = &settings->bus.sdio; struct device_node *np = dev->of_node; int irq; u32 irqf; u32 val; if (!np || bus_type != BRCMF_BUSTYPE_SDIO || !of_device_is_compatible(np, "brcm,bcm4329-fmac")) return; if (of_property_read_u32(np, "brcm,drive-strength", &val) == 0) sdio->drive_strength = val; /* make sure there are interrupts defined in the node */ if (!of_find_property(np, "interrupts", NULL)) return; irq = irq_of_parse_and_map(np, 0); if (!irq) { brcmf_err("interrupt could not be mapped\n"); return; } irqf = irqd_get_trigger_type(irq_get_irq_data(irq)); sdio->oob_irq_supported = true; sdio->oob_irq_nr = irq; sdio->oob_irq_flags = irqf; }
- drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
@startsalt * .probe = brcmf_ops_sdio_probe, * err = brcmf_sdiod_probe(sdiodev); * sdiodev->bus = brcmf_sdio_probe(sdiodev); * brcmf_sdio_probe_attach(bus) * sdiodev->settings = brcmf_get_module_param(sdiodev->dev, BRCMF_BUSTYPE_SDIO, bus->ci->chip, bus->ci->chiprev); * brcmf_of_probe(dev, bus_type, settings); @endsalt
dmesg | grep -E "sdio|fmac"[ 26.051561] brcmfmac: F1 signature read @0x18000000=0x15264345 [ 26.060118] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6 [ 26.060847] usbcore: registered new interface driver brcmfmac [ 26.287504] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6 [ 26.300448] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4345/6 wl0: Feb 27 2018 03:15:32 version 7.45.154 (r684107 CY) FWID 01-4fbe0b04 [ 29.595535] brcmfmac: power management disabled- Kernel內建了两个开源驱动: brcmfmac 提供原生硬MAC支持， brcmsmac 提供基于mac80211的软MAC支持。 它们应该会在启动时自行加载。
- brcmfmac 提供较新的芯片支持，并且支持AP模式，P2P模式，高级加密。
- brcmsmac 仅提供对于较老芯片的支持，例如BCM4313, BCM43224, BCM43225。
- BRCMFMAC: Broadcom FullMAC WLAN driver
SD卡使用的是SD卡协议，而SDIO卡使用的是SDIO协议！协议不一样，初始化/读写方式也不一样！SDIO总线 和 USB总线 类似，SDIO也有两端，其中一端是HOST端，另一端是device端。所有的通信都是由HOST端 发送 命令 开始的，Device端只要能解析命令，就可以相互通信。
- .config
- CONFIG_BRCMDBG=y
- drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
/* Debug level configuration. See debug.h for bits, sysfs modifiable */ int brcmf_msg_level; module_param_named(debug, brcmf_msg_level, int, 0600); MODULE_PARM_DESC(debug, "Level of debug output"); - drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h
/* message levels */ #define BRCMF_TRACE_VAL 0x00000002 #define BRCMF_INFO_VAL 0x00000004 #define BRCMF_DATA_VAL 0x00000008 #define BRCMF_CTL_VAL 0x00000010 #define BRCMF_TIMER_VAL 0x00000020 #define BRCMF_HDRS_VAL 0x00000040 #define BRCMF_BYTES_VAL 0x00000080 #define BRCMF_INTR_VAL 0x00000100 #define BRCMF_GLOM_VAL 0x00000200 #define BRCMF_EVENT_VAL 0x00000400 #define BRCMF_BTA_VAL 0x00000800 #define BRCMF_FIL_VAL 0x00001000 #define BRCMF_USB_VAL 0x00002000 #define BRCMF_SCAN_VAL 0x00004000 #define BRCMF_CONN_VAL 0x00008000 #define BRCMF_BCDC_VAL 0x00010000 #define BRCMF_SDIO_VAL 0x00020000 #define BRCMF_MSGBUF_VAL 0x00040000 #define BRCMF_PCIE_VAL 0x00080000 #define BRCMF_FWCON_VAL 0x00100000 // ...省略 #define BRCMF_DATA_ON() (brcmf_msg_level & BRCMF_DATA_VAL) #define BRCMF_CTL_ON() (brcmf_msg_level & BRCMF_CTL_VAL) #define BRCMF_HDRS_ON() (brcmf_msg_level & BRCMF_HDRS_VAL) #define BRCMF_BYTES_ON() (brcmf_msg_level & BRCMF_BYTES_VAL) #define BRCMF_GLOM_ON() (brcmf_msg_level & BRCMF_GLOM_VAL) #define BRCMF_EVENT_ON() (brcmf_msg_level & BRCMF_EVENT_VAL) #define BRCMF_FIL_ON() (brcmf_msg_level & BRCMF_FIL_VAL) #define BRCMF_FWCON_ON() (brcmf_msg_level & BRCMF_FWCON_VAL) #define BRCMF_SCAN_ON() (brcmf_msg_level & BRCMF_SCAN_VAL) // ...省略 extern int brcmf_msg_level; - /sys/module/brcmfmac/parameters
- brcmf_msg_level
- BRCMF_SCAN_VAL
- echo 0x00004000 > debug
- brcmf_msg_level
- dmesg -w
[10304.778736] brcmfmac: brcmf_cfg80211_scan START ESCAN [10304.778756] brcmfmac: brcmf_do_escan Enter [10304.778768] brcmfmac: brcmf_run_escan E-SCAN START [10304.778782] brcmfmac: brcmf_escan_prep ### List of channelspecs to scan ### 43 [10304.778795] brcmfmac: brcmf_escan_prep Chan : 1, Channel spec: 1001 [10304.778806] brcmfmac: brcmf_escan_prep Chan : 2, Channel spec: 1002 [10304.778817] brcmfmac: brcmf_escan_prep Chan : 3, Channel spec: 1003 [10304.778827] brcmfmac: brcmf_escan_prep Chan : 4, Channel spec: 1004 [10304.778837] brcmfmac: brcmf_escan_prep Chan : 5, Channel spec: 1005 [10304.778847] brcmfmac: brcmf_escan_prep Chan : 6, Channel spec: 1006 [10304.778857] brcmfmac: brcmf_escan_prep Chan : 7, Channel spec: 1007 [10304.778867] brcmfmac: brcmf_escan_prep Chan : 8, Channel spec: 1008 [10304.778877] brcmfmac: brcmf_escan_prep Chan : 9, Channel spec: 1009 [10304.778887] brcmfmac: brcmf_escan_prep Chan : 10, Channel spec: 100a [10304.778898] brcmfmac: brcmf_escan_prep Chan : 11, Channel spec: 100b [10304.778907] brcmfmac: brcmf_escan_prep Chan : 12, Channel spec: 100c [10304.778917] brcmfmac: brcmf_escan_prep Chan : 13, Channel spec: 100d [10304.778927] brcmfmac: brcmf_escan_prep Chan : 14, Channel spec: 100e [10304.778937] brcmfmac: brcmf_escan_prep Chan : 34, Channel spec: d022 [10304.778947] brcmfmac: brcmf_escan_prep Chan : 36, Channel spec: d024 [10304.778957] brcmfmac: brcmf_escan_prep Chan : 38, Channel spec: d026 [10304.778967] brcmfmac: brcmf_escan_prep Chan : 40, Channel spec: d028 [10304.778977] brcmfmac: brcmf_escan_prep Chan : 42, Channel spec: d02a [10304.778987] brcmfmac: brcmf_escan_prep Chan : 44, Channel spec: d02c [10304.778996] brcmfmac: brcmf_escan_prep Chan : 46, Channel spec: d02e [10304.779006] brcmfmac: brcmf_escan_prep Chan : 48, Channel spec: d030 [10304.779016] brcmfmac: brcmf_escan_prep Chan : 52, Channel spec: d034 [10304.779026] brcmfmac: brcmf_escan_prep Chan : 56, Channel spec: d038 [10304.779036] brcmfmac: brcmf_escan_prep Chan : 60, Channel spec: d03c [10304.779046] brcmfmac: brcmf_escan_prep Chan : 64, Channel spec: d040 [10304.779056] brcmfmac: brcmf_escan_prep Chan : 100, Channel spec: d064 [10304.779066] brcmfmac: brcmf_escan_prep Chan : 104, Channel spec: d068 [10304.779076] brcmfmac: brcmf_escan_prep Chan : 108, Channel spec: d06c [10304.779086] brcmfmac: brcmf_escan_prep Chan : 112, Channel spec: d070 [10304.779096] brcmfmac: brcmf_escan_prep Chan : 116, Channel spec: d074 [10304.779106] brcmfmac: brcmf_escan_prep Chan : 120, Channel spec: d078 [10304.779116] brcmfmac: brcmf_escan_prep Chan : 124, Channel spec: d07c [10304.779126] brcmfmac: brcmf_escan_prep Chan : 128, Channel spec: d080 [10304.779136] brcmfmac: brcmf_escan_prep Chan : 132, Channel spec: d084 [10304.779146] brcmfmac: brcmf_escan_prep Chan : 136, Channel spec: d088 [10304.779156] brcmfmac: brcmf_escan_prep Chan : 140, Channel spec: d08c [10304.779166] brcmfmac: brcmf_escan_prep Chan : 144, Channel spec: d090 [10304.779176] brcmfmac: brcmf_escan_prep Chan : 149, Channel spec: d095 [10304.779185] brcmfmac: brcmf_escan_prep Chan : 153, Channel spec: d099 [10304.779195] brcmfmac: brcmf_escan_prep Chan : 157, Channel spec: d09d [10304.779205] brcmfmac: brcmf_escan_prep Chan : 161, Channel spec: d0a1 [10304.779215] brcmfmac: brcmf_escan_prep Chan : 165, Channel spec: d0a5 [10304.779225] brcmfmac: brcmf_escan_prep ### List of SSIDs to scan ### 1 [10304.779235] brcmfmac: brcmf_escan_prep 0: Broadcast scan [10304.805741] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10304.811759] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10304.814186] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10304.816229] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10304.822027] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10304.826680] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10304.834042] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10304.872938] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10304.893764] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10304.896223] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10304.904950] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10304.927291] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10304.982775] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10304.988280] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10304.991044] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10304.998806] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.008746] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.015325] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.024026] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.026718] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.038810] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.041455] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.043879] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.049501] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.116121] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.150645] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.171285] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.199340] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.277681] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.295773] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.298401] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.334580] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.356042] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.357382] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.358762] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.398474] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.417992] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.435327] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.482006] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.482909] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.483585] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.483604] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.484634] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.484651] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.486188] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.490144] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.502078] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.503735] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.503752] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.504787] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.504805] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.505889] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.505905] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.507497] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.507515] brcmfmac: brcmf_cfg80211_escan_handler ESCAN Partial result [10305.570447] brcmfmac: brcmf_inform_bss scanned AP count (29) [10305.570711] brcmfmac: brcmf_notify_escan_complete Enter [10305.570724] brcmfmac: brcmf_notify_escan_complete ESCAN Completed scan: Done [10305.574695] brcmfmac: brcmf_cfg80211_sched_scan_start Enter: n_match_sets=4 n_ssids=1 [10305.574709] brcmfmac: brcmf_pno_store_request reqid=0 [10305.574721] brcmfmac: brcmf_pno_prep_fwconfig n_reqs=1 [10305.574733] brcmfmac: brcmf_pno_get_bucket_channels [0] Chan : 1 [10305.574744] brcmfmac: brcmf_pno_get_bucket_channels [1] Chan : 2 [10305.574754] brcmfmac: brcmf_pno_get_bucket_channels [2] Chan : 3 [10305.574765] brcmfmac: brcmf_pno_get_bucket_channels [3] Chan : 4 [10305.574775] brcmfmac: brcmf_pno_get_bucket_channels [4] Chan : 5 [10305.574785] brcmfmac: brcmf_pno_get_bucket_channels [5] Chan : 6 [10305.574795] brcmfmac: brcmf_pno_get_bucket_channels [6] Chan : 7 [10305.574804] brcmfmac: brcmf_pno_get_bucket_channels [7] Chan : 8 [10305.574814] brcmfmac: brcmf_pno_get_bucket_channels [8] Chan : 9 [10305.574823] brcmfmac: brcmf_pno_get_bucket_channels [9] Chan : 10 [10305.574834] brcmfmac: brcmf_pno_get_bucket_channels [10] Chan : 11 [10305.574843] brcmfmac: brcmf_pno_get_bucket_channels [11] Chan : 12 [10305.574853] brcmfmac: brcmf_pno_get_bucket_channels [12] Chan : 13 [10305.574863] brcmfmac: brcmf_pno_get_bucket_channels [13] Chan : 14 [10305.574873] brcmfmac: brcmf_pno_get_bucket_channels [14] Chan : 34 [10305.574882] brcmfmac: brcmf_pno_get_bucket_channels [15] Chan : 36 [10305.574892] brcmfmac: brcmf_pno_get_bucket_channels [16] Chan : 38 [10305.574901] brcmfmac: brcmf_pno_get_bucket_channels [17] Chan : 40 [10305.574911] brcmfmac: brcmf_pno_get_bucket_channels [18] Chan : 42 [10305.574920] brcmfmac: brcmf_pno_get_bucket_channels [19] Chan : 44 [10305.574930] brcmfmac: brcmf_pno_get_bucket_channels [20] Chan : 46 [10305.574939] brcmfmac: brcmf_pno_get_bucket_channels [21] Chan : 48 [10305.574949] brcmfmac: brcmf_pno_get_bucket_channels [22] Chan : 52 [10305.574958] brcmfmac: brcmf_pno_get_bucket_channels [23] Chan : 56 [10305.574968] brcmfmac: brcmf_pno_get_bucket_channels [24] Chan : 60 [10305.574977] brcmfmac: brcmf_pno_get_bucket_channels [25] Chan : 64 [10305.574987] brcmfmac: brcmf_pno_get_bucket_channels [26] Chan : 100 [10305.574996] brcmfmac: brcmf_pno_get_bucket_channels [27] Chan : 104 [10305.575006] brcmfmac: brcmf_pno_get_bucket_channels [28] Chan : 108 [10305.575016] brcmfmac: brcmf_pno_get_bucket_channels [29] Chan : 112 [10305.575025] brcmfmac: brcmf_pno_get_bucket_channels [30] Chan : 116 [10305.575035] brcmfmac: brcmf_pno_get_bucket_channels [31] Chan : 120 [10305.575044] brcmfmac: brcmf_pno_get_bucket_channels [32] Chan : 124 [10305.575054] brcmfmac: brcmf_pno_get_bucket_channels [33] Chan : 128 [10305.575063] brcmfmac: brcmf_pno_get_bucket_channels [34] Chan : 132 [10305.575073] brcmfmac: brcmf_pno_get_bucket_channels [35] Chan : 136 [10305.575082] brcmfmac: brcmf_pno_get_bucket_channels [36] Chan : 140 [10305.575092] brcmfmac: brcmf_pno_get_bucket_channels [37] Chan : 144 [10305.575101] brcmfmac: brcmf_pno_get_bucket_channels [38] Chan : 149 [10305.575111] brcmfmac: brcmf_pno_get_bucket_channels [39] Chan : 153 [10305.575120] brcmfmac: brcmf_pno_get_bucket_channels [40] Chan : 157 [10305.575130] brcmfmac: brcmf_pno_get_bucket_channels [41] Chan : 161 [10305.575139] brcmfmac: brcmf_pno_get_bucket_channels [42] Chan : 165 [10305.575150] brcmfmac: brcmf_pno_prep_fwconfig: base period=10 [10305.575162] brcmfmac: brcmf_pno_prep_fwconfig: [0] period 1 max 0 repeat 0 flag 4 idx 42 [10305.580589] brcmfmac: brcmf_pno_remove_request reqid=0
- 参考文档：kernel trace_event 宏展开注解
- brcmf_dbg(TRACE, "Enter\n");
- drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h
#define BRCMF_TRACE_VAL 0x00000002 // ...省略 #define brcmf_dbg(level, fmt, ...) \ do { \ __brcmf_dbg(BRCMF_##level##_VAL, __func__, \ fmt, ##__VA_ARGS__); \ } while (0)
- drivers/net/wireless/broadcom/brcm80211/brcmfmac/common.c
#if defined(CONFIG_BRCM_TRACING) || defined(CONFIG_BRCMDBG) void __brcmf_dbg(u32 level, const char *func, const char *fmt, ...) { struct va_format vaf = { .fmt = fmt, }; va_list args; va_start(args, fmt); vaf.va = &args; if (brcmf_msg_level & level) pr_debug("%s %pV", func, &vaf); trace_brcmf_dbg(level, func, &vaf); va_end(args); } #endif
- drivers/net/wireless/broadcom/brcm80211/brcmfmac/tracepoint.h
TRACE_EVENT(brcmf_dbg, TP_PROTO(u32 level, const char *func, struct va_format *vaf), TP_ARGS(level, func, vaf), TP_STRUCT__entry( __field(u32, level) __string(func, func) __dynamic_array(char, msg, MAX_MSG_LEN) ), TP_fast_assign( __entry->level = level; __assign_str(func, func); WARN_ON_ONCE(vsnprintf(__get_dynamic_array(msg), MAX_MSG_LEN, vaf->fmt, *vaf->va) >= MAX_MSG_LEN); ), TP_printk("%s: %s", __get_str(func), __get_str(msg)) );
- drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.h
- 在ftrace events下没有找到相关内容，故检查对应的配置，发现确实没有加入：
- .config
- # CONFIG_BRCM_TRACING is not set
- .config
- grep CONFIG_BRCM_TRACING .config
CONFIG_BRCM_TRACING=y - drivers/net/wireless/broadcom/brcm80211/brcmfmac/tracepoint.h
- #define TRACE_SYSTEM brcmfmac
- KERNEL=kernel7l && make -j4 modules
- sudo cp drivers/net/wireless/broadcom/brcm80211/brcmfmac/brcmfmac.ko /lib/modules/4.19.71-v7l/kernel/drivers/net/wireless/broadcom/brcm80211/brcmfmac/brcmfmac.ko
- reboot
- /sys/kernel/debug/tracing/events
- ls brcmfmac -1
brcmf_bcdchdr brcmf_dbg brcmf_err brcmf_hexdump brcmf_sdpcm_hdr enable filter
- ls brcmfmac -1
- trace-cmd record -e brcmfmac
- kerenlshark
- kerenlshark
- trace-cmd report
- drivers/net/wireless/broadcom/brcm80211/brcmfmac/brcmfmac.ko
- uname -a
Linux raspberrypi 4.19.71-v7l #3 SMP Sun Feb 23 03:18:41 GMT 2020 armv7l GNU/Linux - modules/4.19.71-v7l/kernel/drivers/net/wireless/broadcom/brcm80211/brcmfmac/brcmfmac.ko
- 模块自动插入参考文档: USB_Camera_udev
- lsmod | grep brcmfmac
brcmfmac 315392 0 brcmutil 16384 1 brcmfmac cfg80211 610304 1 brcmfmac- 查看模块信息：
- modinfo cfg80211
- modinfo brcmfmac
- modinfo brcmutil
- 查看模块信息：
可以认为这里主要是做一下cfg80211配置工作，如sys目录下的资源生成，netlink（nl80211）的加载，主要是这些是通用的；
@startsalt
* net/wireless/core.c
* fs_initcall(cfg80211_init);
* err = nl80211_init();
* err = genl_register_family(&nl80211_fam); // genl_register_family - register a generic netlink family
* static struct genl_family nl80211_fam;
* .ops = nl80211_ops,
* .cmd = NL80211_CMD_TRIGGER_SCAN,
* .doit = nl80211_trigger_scan,
* static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
* struct cfg80211_registered_device *rdev = info->user_ptr[0]; // 这里相当于获取到Wifi设备，可以使用其注册的cfg80211操作函数，暂时不分析为什么；
* err = rdev_scan(rdev, request);
* trace_rdev_scan(&rdev->wiphy, request); // 在trace中可以看到这个
* ret = rdev->ops->scan(&rdev->wiphy, request); // ops(brcmf_cfg80211_ops)是cfg80211的scan函数
* trace_rdev_return_int(&rdev->wiphy, ret);
* nl80211_send_scan_start(rdev, wdev); // 通知用户层SCAN命令已经下达完成
* msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
* nl80211_prep_scan_msg(msg, rdev, wdev, 0, 0, 0, NL80211_CMD_TRIGGER_SCAN)
* genlmsg_multicast_netns(&nl80211_fam, wiphy_net(&rdev->wiphy), msg, 0, NL80211_MCGRP_SCAN, GFP_KERNEL);
* err = netlink_register_notifier(&nl80211_netlink_notifier);
@endsalt每一张网卡对应一个struct cfg80211_registered_device PHY设备，本质还是调用前面的cfg80211的驱动去生成PHY，这里需要理解的是Scan只需要PHY就能独立完成，跟有线网卡的PHY自动握手规则一样；
@startsalt
* drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
* .probe = brcmf_ops_sdio_probe,
* err = brcmf_sdiod_probe(sdiodev);
* sdiodev->bus = brcmf_sdio_probe(sdiodev);
* ret = brcmf_fw_get_firmwares(sdiodev->dev, fwreq, brcmf_sdio_firmware_callback);
* brcmf_sdio_firmware_callback
* err = brcmf_attach(sdiod->dev, sdiod->settings);
* ops = brcmf_cfg80211_get_ops(settings);
* ops = kmemdup(&brcmf_cfg80211_ops, sizeof(brcmf_cfg80211_ops), GFP_KERNEL);
* static struct cfg80211_ops brcmf_cfg80211_ops
* .scan = brcmf_cfg80211_scan,
* err = brcmf_do_escan(vif->ifp, request); // 最终处理Scan的调用
* wiphy = wiphy_new(ops, sizeof(*drvr)); // 生成wireless phy
* wiphy_new_nm(ops, sizeof_priv, NULL);
* struct cfg80211_registered_device *rdev;
* rdev = kzalloc(alloc_size, GFP_KERNEL); // 相当于注册一个Wifi的PHY了
* rdev->ops = ops; // cfg80211(brcmf_cfg80211_ops)操作函数
* rdev->wiphy_idx = atomic_inc_return(&wiphy_counter); // phy[X]: phy序号
* rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); // 最终的phy名
* ret = brcmf_bus_started(drvr, ops); // 这里才是真正开始注册无线网卡的地方
* ifp = brcmf_add_if(drvr, 0, 0, false, "wlan%d", NULL); // 生成wlan[X]设备
* drvr->config = brcmf_cfg80211_attach(drvr, ops, drvr->settings->p2p_enable);
* err = brcmf_setup_wiphy(wiphy, ifp);
* ret = brcmf_net_attach(ifp, false);
* err = register_netdevice(ndev); | err = register_netdev(ndev);
@endsalt- drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
static struct cfg80211_ops brcmf_cfg80211_ops = { .add_virtual_intf = brcmf_cfg80211_add_iface, .del_virtual_intf = brcmf_cfg80211_del_iface, .change_virtual_intf = brcmf_cfg80211_change_iface, .scan = brcmf_cfg80211_scan, .set_wiphy_params = brcmf_cfg80211_set_wiphy_params, .join_ibss = brcmf_cfg80211_join_ibss, .leave_ibss = brcmf_cfg80211_leave_ibss, .get_station = brcmf_cfg80211_get_station, .dump_station = brcmf_cfg80211_dump_station, .set_tx_power = brcmf_cfg80211_set_tx_power, .get_tx_power = brcmf_cfg80211_get_tx_power, .add_key = brcmf_cfg80211_add_key, .del_key = brcmf_cfg80211_del_key, .get_key = brcmf_cfg80211_get_key, .set_default_key = brcmf_cfg80211_config_default_key, .set_default_mgmt_key = brcmf_cfg80211_config_default_mgmt_key, .set_power_mgmt = brcmf_cfg80211_set_power_mgmt, .connect = brcmf_cfg80211_connect, .disconnect = brcmf_cfg80211_disconnect, .suspend = brcmf_cfg80211_suspend, .resume = brcmf_cfg80211_resume, .set_pmksa = brcmf_cfg80211_set_pmksa, .del_pmksa = brcmf_cfg80211_del_pmksa, .flush_pmksa = brcmf_cfg80211_flush_pmksa, .start_ap = brcmf_cfg80211_start_ap, .stop_ap = brcmf_cfg80211_stop_ap, .change_beacon = brcmf_cfg80211_change_beacon, .del_station = brcmf_cfg80211_del_station, .change_station = brcmf_cfg80211_change_station, .sched_scan_start = brcmf_cfg80211_sched_scan_start, .sched_scan_stop = brcmf_cfg80211_sched_scan_stop, .mgmt_frame_register = brcmf_cfg80211_mgmt_frame_register, .mgmt_tx = brcmf_cfg80211_mgmt_tx, .remain_on_channel = brcmf_p2p_remain_on_channel, .cancel_remain_on_channel = brcmf_cfg80211_cancel_remain_on_channel, .get_channel = brcmf_cfg80211_get_channel, .start_p2p_device = brcmf_p2p_start_device, .stop_p2p_device = brcmf_p2p_stop_device, .crit_proto_start = brcmf_cfg80211_crit_proto_start, .crit_proto_stop = brcmf_cfg80211_crit_proto_stop, .tdls_oper = brcmf_cfg80211_tdls_oper, .update_connect_params = brcmf_cfg80211_update_conn_params, .set_pmk = brcmf_cfg80211_set_pmk, .del_pmk = brcmf_cfg80211_del_pmk, };
struct wiphy- wireless hardware description- wireless phy