BCM43438 android6.0移植
发布日期：2021-09-16 16:46:43
浏览次数：36
分类：技术文章
本文共 39554 字，大约阅读时间需要 131 分钟。
编译的全部源码位于drivers/net/wireless/bcmdhd目录下。
初始化流程：
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dhd_linux.c中dhd_module_init()调用dhd_wifi_platform_register_drv()
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dhd_linux_plat.c中dhd_wifi_platform_register_drv()调用platform_driver_register()
if (cfg_multichip) { //值为FALSE不执行 dev = bus_find_device(&platform_bus_type, NULL, WIFI_PLAT_EXT, wifi_platdev_match); if (dev == NULL) { DHD_ERROR(("bcmdhd wifi platform data device not found!!\n")); return -ENXIO; } err = platform_driver_register(&dhd_wifi_platform_dev_driver); } else { err = wifi_ctrlfunc_register_drv(); /* no wifi ctrl func either, load bus directly and ignore this error */ if (err) { if (err == -ENXIO) { /* wifi ctrl function does not exist */ err = dhd_wifi_platform_load(); } else { /* unregister driver due to initialization failure */ wifi_ctrlfunc_unregister_drv(); } } } 执行wifi_ctrlfunc_register_drv()：
static int wifi_ctrlfunc_register_drv(void){ int err = 0; struct device *dev1, *dev2; wifi_adapter_info_t *adapter;dhd_exynos7420_platdev.c中注册了名为WIFI_PLAT_NAME的devices。 dev1 = bus_find_device(&platform_bus_type, NULL, WIFI_PLAT_NAME, wifi_platdev_match); dev2 = bus_find_device(&platform_bus_type, NULL, WIFI_PLAT_NAME2, wifi_platdev_match);#if !defined(CONFIG_DTS) if (!dts_enabled) { if (dev1 == NULL && dev2 == NULL) { DHD_ERROR(("no wifi platform data, skip\n")); return -ENXIO; } }#endif /* !defined(CONFIG_DTS) */ /* multi-chip support not enabled, build one adapter information for * DHD (either SDIO, USB or PCIe) */ adapter = kzalloc(sizeof(wifi_adapter_info_t), GFP_KERNEL); adapter->name = "DHD generic adapter"; adapter->bus_type = -1; adapter->bus_num = -1; adapter->slot_num = -1; adapter->irq_num = -1; is_power_on = FALSE; wifi_plat_dev_probe_ret = 0; dhd_wifi_platdata = kzalloc(sizeof(bcmdhd_wifi_platdata_t), GFP_KERNEL); dhd_wifi_platdata->num_adapters = 1; dhd_wifi_platdata->adapters = adapter; if (dev1) { err = platform_driver_register(&wifi_platform_dev_driver); if (err) { DHD_ERROR(("%s: failed to register wifi ctrl func driver\n", __FUNCTION__)); return err; } } 执行platform_driver_register(&wifi_platform_dev_driver)，因为是注册
static struct platform_driver dhd_wifi_platform_dev_driver = { .probe = bcmdhd_wifi_plat_dev_drv_probe, .remove = bcmdhd_wifi_plat_dev_drv_remove, .driver = { .name = WIFI_PLAT_EXT, }}; 所以调用bcmdhd_wifi_plat_dev_drv_probe():
static int bcmdhd_wifi_plat_dev_drv_probe(struct platform_device *pdev){ dhd_wifi_platdata = (bcmdhd_wifi_platdata_t *)(pdev->dev.platform_data); return dhd_wifi_platform_load();} 再执行dhd_wifi_platform_load():
static int dhd_wifi_platform_load(){ int err = 0; printf("%s: Enter\n", __FUNCTION__); wl_android_init(); if ((err = dhd_wifi_platform_load_usb())) goto end; else if ((err = dhd_wifi_platform_load_sdio())){ printk("1\n"); goto end; } else err = dhd_wifi_platform_load_pcie();end: if (err) wl_android_exit();#if !defined(MULTIPLE_SUPPLICANT) else wl_android_post_init();#endif return err;} 由于在Makefile中定义了宏BCMSDIO，所以调用dhd_wifi_platform_load_sdio()
Makefile中定义了多个宏
DHDCFLAGS = -Wall -Wstrict-prototypes -Dlinux -DBCMDRIVER -DSDTEST \ -DBCMDONGLEHOST -DUNRELEASEDCHIP -DBCMDMA32 -DBCMFILEIMAGE \ -DDHDTHREAD -DDHD_DEBUG -DSHOW_EVENTS -DBCMDBG -DGET_OTP_MAC_ENABLE \ -DWIFI_ACT_FRAME -DARP_OFFLOAD_SUPPORT -DSUPPORT_PM2_ONLY \ -DKEEP_ALIVE -DPKT_FILTER_SUPPORT -DPNO_SUPPORT -DDHDTCPACK_SUPPRESS \ -DDHD_DONOT_FORWARD_BCMEVENT_AS_NETWORK_PKT -DRXFRAME_THREAD \ -DBCMSDIOH_TXGLOM_EXT \ -DENABLE_INSMOD_NO_FW_LOAD \ -Idrivers/net/wireless/bcmdhd -Idrivers/net/wireless/bcmdhd/includeDHDCFLAGS += \ -DBCMSDIO -DMMC_SDIO_ABORT -DBCMLXSDMMC -DUSE_SDIOFIFO_IOVAR \ -DBDC -DPROP_TXSTATUS -DDHD_USE_IDLECOUNT -DBCMSDIOH_TXGLOM \ -DCUSTOM_SDIO_F2_BLKSIZE=128
dhd_wifi_platform_load_sdio()代码：
#ifdef BCMSDIOstatic int dhd_wifi_platform_load_sdio(void){ int i; int err = 0; wifi_adapter_info_t *adapter; printk("dhd_wifi_platform_load_sdio\n"); BCM_REFERENCE(i); BCM_REFERENCE(adapter); /* Sanity check on the module parameters * - Both watchdog and DPC as tasklets are ok * - If both watchdog and DPC are threads, TX must be deferred */ if (!(dhd_watchdog_prio < 0 && dhd_dpc_prio < 0) && !(dhd_watchdog_prio >= 0 && dhd_dpc_prio >= 0 && dhd_deferred_tx)) return -EINVAL;#if defined(BCMLXSDMMC) if (dhd_wifi_platdata == NULL) { DHD_ERROR(("DHD wifi platform data is required for Android build\n")); return -EINVAL; } sema_init(&dhd_registration_sem, 0); /* power up all adapters */ for (i = 0; i < dhd_wifi_platdata->num_adapters; i++) { bool chip_up = FALSE; int retry = POWERUP_MAX_RETRY; struct semaphore dhd_chipup_sem; adapter = &dhd_wifi_platdata->adapters[i]; DHD_ERROR(("Power-up adapter '%s'\n", adapter->name)); //name= DHD generic adapter DHD_INFO((" - irq %d [flags %d], firmware: %s, nvram: %s\n", adapter->irq_num, adapter->intr_flags, adapter->fw_path, adapter->nv_path)); DHD_INFO((" - bus type %d, bus num %d, slot num %d\n\n", adapter->bus_type, adapter->bus_num, adapter->slot_num)); do { sema_init(&dhd_chipup_sem, 0); err = dhd_bus_reg_sdio_notify(&dhd_chipup_sem); if (err) { DHD_ERROR(("%s dhd_bus_reg_sdio_notify fail(%d)\n\n", __FUNCTION__, err)); return err; }//dhd_exynos7420_platdev.c中函数espresso_wifi_power() err = wifi_platform_set_power(adapter, TRUE, WIFI_TURNON_DELAY); if (err) { /* WL_REG_ON state unknown, Power off forcely */ wifi_platform_set_power(adapter, FALSE, WIFI_TURNOFF_DELAY); continue; } else { //执行到这 wifi_platform_bus_enumerate(adapter, TRUE); err = 0; } if (down_timeout(&dhd_chipup_sem, msecs_to_jiffies(POWERUP_WAIT_MS)) == 0) { dhd_bus_unreg_sdio_notify(); chip_up = TRUE; //执行到这表示获取到信号量退出while循环, 由于dhd_wifi_platdata->num_adapters等于1，也会退出for循环 break; } DHD_ERROR(("failed to power up %s, %d retry left\n", adapter->name, retry)); dhd_bus_unreg_sdio_notify(); wifi_platform_set_power(adapter, FALSE, WIFI_TURNOFF_DELAY); wifi_platform_bus_enumerate(adapter, FALSE); } while (retry--); if (!chip_up) { DHD_ERROR(("failed to power up %s, max retry reached**\n", adapter->name)); return -ENODEV; } } err = dhd_bus_register(); if (err) { DHD_ERROR(("%s: sdio_register_driver failed\n", __FUNCTION__)); goto fail; } /* * Wait till MMC sdio_register_driver callback called and made driver attach. * It's needed to make sync up exit from dhd insmod and * Kernel MMC sdio device callback registration */ err = down_timeout(&dhd_registration_sem, msecs_to_jiffies(DHD_REGISTRATION_TIMEOUT)); if (err) { DHD_ERROR(("%s: sdio_register_driver timeout or error \n", __FUNCTION__)); dhd_bus_unregister(); goto fail; } return err;fail: /* power down all adapters */ for (i = 0; i < dhd_wifi_platdata->num_adapters; i++) { adapter = &dhd_wifi_platdata->adapters[i]; wifi_platform_set_power(adapter, FALSE, WIFI_TURNOFF_DELAY); wifi_platform_bus_enumerate(adapter, FALSE); }#else /* x86 bring-up PC needs no power-up operations */ err = dhd_bus_register();#endif return err;}#else /* BCMSDIO */ <1>上面for循环中遍历dhd_wifi_platdata->num_adapters，apdpter是适配器的意思，它在函数wifi_ctrlfunc_register_drv()初始了一个实体：
adapter = kzalloc(sizeof(wifi_adapter_info_t), GFP_KERNEL); adapter->name = "DHD generic adapter"; adapter->bus_type = -1; adapter->bus_num = -1; adapter->slot_num = -1; adapter->irq_num = -1; is_power_on = FALSE; wifi_plat_dev_probe_ret = 0; dhd_wifi_platdata = kzalloc(sizeof(bcmdhd_wifi_platdata_t), GFP_KERNEL); dhd_wifi_platdata->num_adapters = 1; dhd_wifi_platdata->adapters = adapter;
Adapter一个重要的成员是wifi_plat_data，它在函数wifi_plat_dev_drv_probe中被赋值（还有其它成员被初始化）：
static int wifi_plat_dev_drv_probe(struct platform_device *pdev){ struct resource *resource; wifi_adapter_info_t *adapter;#ifdef CONFIG_DTS int irq, gpio;#endif /* CONFIG_DTS */ /* Android style wifi platform data device ("bcmdhd_wlan" or "bcm4329_wlan") * is kept for backward compatibility and supports only 1 adapter */ ASSERT(dhd_wifi_platdata != NULL); ASSERT(dhd_wifi_platdata->num_adapters == 1); adapter = &dhd_wifi_platdata->adapters[0]; //由于只支持一个adapter，所以只简单取数组0的值。 adapter->wifi_plat_data = (struct wifi_platform_data *)(pdev->dev.platform_data); Wifi_plat_dev_drv_probe()来自：
static struct platform_driver wifi_platform_dev_driver = { .probe = wifi_plat_dev_drv_probe, .remove = wifi_plat_dev_drv_remove, .suspend = wifi_plat_dev_drv_suspend, .resume = wifi_plat_dev_drv_resume, .driver = { .name = WIFI_PLAT_NAME,#ifdef CONFIG_DTS .of_match_table = wifi_device_dt_match,#endif /* CONFIG_DTS */ }}; 这个设备在上面说过的函数wifi_ctrlfunc_register_drv()中初始化，见代码：
static int wifi_ctrlfunc_register_drv(void){ wifi_adapter_info_t *adapter;#ifndef CUSTOMER_HW int err = 0; struct device *dev1, *dev2; dev1 = bus_find_device(&platform_bus_type, NULL, WIFI_PLAT_NAME, wifi_platdev_match); dev2 = bus_find_device(&platform_bus_type, NULL, WIFI_PLAT_NAME2, wifi_platdev_match);#endif#if !defined(CONFIG_DTS) && !defined(CUSTOMER_HW) if (!dts_enabled) { if (dev1 == NULL && dev2 == NULL) { DHD_ERROR(("no wifi platform data, skip\n")); return -ENXIO; } }#endif /* !defined(CONFIG_DTS) */ /* multi-chip support not enabled, build one adapter information for * DHD (either SDIO, USB or PCIe) */ adapter = kzalloc(sizeof(wifi_adapter_info_t), GFP_KERNEL); adapter->name = "DHD generic adapter"; adapter->bus_type = -1; adapter->bus_num = -1; adapter->slot_num = -1; adapter->irq_num = -1; is_power_on = FALSE; wifi_plat_dev_probe_ret = 0; dhd_wifi_platdata = kzalloc(sizeof(bcmdhd_wifi_platdata_t), GFP_KERNEL); dhd_wifi_platdata->num_adapters = 1; dhd_wifi_platdata->adapters = adapter;#ifndef CUSTOMER_HW if (dev1) { err = platform_driver_register(&wifi_platform_dev_driver); 初始化 if (err) { DHD_ERROR(("%s: failed to register wifi ctrl func driver\n", __FUNCTION__)); return err; } } if (dev2) { err = platform_driver_register(&wifi_platform_dev_driver_legacy); if (err) { DHD_ERROR(("%s: failed to register wifi ctrl func legacy driver\n", __FUNCTION__)); return err; } }#endif 注：Dhd_linux_platdev.c的入口函数是dhd_wifi_platform_register_drv()，它调用了wifi_ctrlfunc_register_drv()做了初始化。wifi_plat_data的初始化在文件dhd_exynos7420_platdev.c中，它注册了platform_device。注：整个wifi源码的核心是名称为” bcmdhd_wlan”, platform_device的源码是dhd_exynos7420_platdev.c，platform_driver的源码是dhd_linux_platdev.c。<2> wifi_platform_set_power()函数分析：
int wifi_platform_set_power(wifi_adapter_info_t *adapter, bool on, unsigned long msec){ int err = 0;#ifdef CONFIG_DTS if (on) { err = regulator_enable(wifi_regulator); is_power_on = TRUE; } else { err = regulator_disable(wifi_regulator); is_power_on = FALSE; } if (err < 0) DHD_ERROR(("%s: regulator enable/disable failed", __FUNCTION__));#else struct wifi_platform_data *plat_data; if (!adapter || !adapter->wifi_plat_data) return -EINVAL; plat_data = adapter->wifi_plat_data; //在上面<1>分析了wifi_plat_data，它其实是pdev->dev.platform_data， 代码在dhd_exynos7420_platdev.c中。 DHD_ERROR(("%s = %d\n", __FUNCTION__, on)); if (plat_data->set_power) {#ifdef ENABLE_4335BT_WAR if (on) { printk("WiFi: trying to acquire BT lock\n"); if (bcm_bt_lock(lock_cookie_wifi) != 0) printk("** WiFi: timeout in acquiring bt lock**\n"); printk("%s: btlock acquired\n", __FUNCTION__); } else { /* For a exceptional case, release btlock */ bcm_bt_unlock(lock_cookie_wifi); }#endif /* ENABLE_4335BT_WAR */ err = plat_data->set_power(on); } if (msec && !err) OSL_SLEEP(msec); if (on && !err) is_power_on = TRUE; else is_power_on = FALSE;#endif /* CONFIG_DTS */ return err;} <3>wifi_platform_bus_enumerate()函数分析：
//下面两个变量是程序员调试用的代码。extern void (*wifi_status_cb)(struct platform_device *, int state); //定义在mmc/host/dw_mmc.c中。extern struct platform_device *wifi_mmc_dev; //int wifi_platform_bus_enumerate(wifi_adapter_info_t *adapter, bool device_present){ int err = 0; struct wifi_platform_data *plat_data; if (!adapter || !adapter->wifi_plat_data) return -EINVAL; plat_data = adapter->wifi_plat_data; DHD_ERROR(("%s device present %d\n", __FUNCTION__, device_present)); if (plat_data->set_carddetect) { //调用dhd_exynos7420_platdev.c中的set_carddetect() err = plat_data->set_carddetect(device_present); } return err;} <4>信号量dhd_chipup_sem， 相关代码:
static int dhd_wifi_platform_load_sdio(void){…略 do { sema_init(&dhd_chipup_sem, 0); //初始化 err = dhd_bus_reg_sdio_notify(&dhd_chipup_sem); //注册到sdio的驱动中 if (err) { DHD_ERROR(("%s dhd_bus_reg_sdio_notify fail(%d)\n\n", __FUNCTION__, err)); return err; } err = wifi_platform_set_power(adapter, TRUE, WIFI_TURNON_DELAY); if (err) { /* WL_REG_ON state unknown, Power off forcely */ wifi_platform_set_power(adapter, FALSE, WIFI_TURNOFF_DELAY); printk("continue.\n"); continue; } else { wifi_platform_bus_enumerate(adapter, TRUE); printk("wifi_platform_bus_enumerate ok.\n"); err = 0; } //获取到信号量表示sdio初始化成功，过程见分析。 if (down_timeout(&dhd_chipup_sem, msecs_to_jiffies(POWERUP_WAIT_MS)) == 0) { dhd_bus_unreg_sdio_notify(); chip_up = TRUE; printk("down_timeout.\n"); break; } DHD_ERROR(("failed to power up %s, %d retry left\n", adapter->name, retry)); dhd_bus_unreg_sdio_notify(); wifi_platform_set_power(adapter, FALSE, WIFI_TURNOFF_DELAY); wifi_platform_bus_enumerate(adapter, FALSE); } while (retry--); if (!chip_up) { DHD_ERROR(("failed to power up %s, max retry reached**\n", adapter->name)); return -ENODEV; } } dhd_bus_reg_sdio_notify(&dhd_chipup_sem)的代码：
Dhd_sdio.c中：int dhd_bus_reg_sdio_notify(void* semaphore){ return bcmsdh_reg_sdio_notify(semaphore);}Bcmsdh_linux.cint bcmsdh_reg_sdio_notify(void* semaphore){ return sdio_func_reg_notify(semaphore);}Bcmsdh_emmc_linux.cint sdio_func_reg_notify(void* semaphore){ notify_semaphore = semaphore; return sdio_register_driver(&dummy_sdmmc_driver);} Dummy_sdmmc_driver的相关代码如下：
static int dummy_probe(struct sdio_func *func, const struct sdio_device_id *id){ if (func && (func->num != 2)) { return 0; } if (notify_semaphore) up(notify_semaphore); //这里会释放信号量，关键代码在上面的func->num!=2 return 0;}static void dummy_remove(struct sdio_func *func){}static struct sdio_driver dummy_sdmmc_driver = { .probe = dummy_probe, .remove = dummy_remove, .name = "dummy_sdmmc", .id_table = bcmsdh_sdmmc_ids, }; <4> dhd_bus_register()分析：
Dhd_sdio.cstatic bcmsdh_driver_t dhd_sdio = { dhdsdio_probe, dhdsdio_disconnect, dhdsdio_suspend, dhdsdio_resume};intdhd_bus_register(void){ DHD_TRACE(("%s: Enter\n", __FUNCTION__)); return bcmsdh_register(&dhd_sdio);}Bcmsdh_linux.cintbcmsdh_register(bcmsdh_driver_t *driver){ int error = 0; drvinfo = *driver; SDLX_MSG(("%s: register client driver\n", __FUNCTION__)); error = bcmsdh_register_client_driver(); if (error) SDLX_MSG(("%s: failed %d\n", __FUNCTION__, error)); return error;}Bcmsdh_emmc_linux.cint bcmsdh_register_client_driver(void){#ifdef GLOBAL_SDMMC_INSTANCE gInstance = kzalloc(sizeof(BCMSDH_SDMMC_INSTANCE), GFP_KERNEL); if (!gInstance) return -ENOMEM;#endif return sdio_register_driver(&bcmsdh_sdmmc_driver);}static struct sdio_driver bcmsdh_sdmmc_driver = { .probe = bcmsdh_sdmmc_probe, .remove = bcmsdh_sdmmc_remove, .name = "bcmsdh_sdmmc", .id_table = bcmsdh_sdmmc_ids,#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 39)) && defined(CONFIG_PM) .drv = { .pm = &bcmsdh_sdmmc_pm_ops, },#endif /* (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 39)) && defined(CONFIG_PM) */};然后执行它的bcmsdh_sdmmc_probe():static int bcmsdh_sdmmc_probe(struct sdio_func *func, const struct sdio_device_id *id){ int ret = 0; if (func == NULL) return -EINVAL; sd_err(("bcmsdh_sdmmc: %s Enter\n", __FUNCTION__)); sd_info(("sdio_bcmsdh: func->class=%x\n", func->class)); sd_info(("sdio_vendor: 0x%04x\n", func->vendor)); sd_info(("sdio_device: 0x%04x\n", func->device)); sd_info(("Function#: 0x%04x\n", func->num));#ifdef GLOBAL_SDMMC_INSTANCE gInstance->func[func->num] = func;#endif /* 4318 doesn't have function 2 */ if ((func->num == 2) || (func->num == 1 && func->device == 0x4)) ret = sdioh_probe(func); return ret;} 发现LOG的最后是：
[ 15.015549] [5: swapper/0: 1] [c5] [WLAN] Wifi Power Off.
找到打印这个的是在函数wifi_platform_set_power,于是在这个函数中打印这句的上面加上dump_stace()，打印的信息如下：
[ 14.508148] [6: swapper/0: 1] [c6] sdioh_set_mode: set txglom_mode to multi-desc[ 14.516457] [6: swapper/0: 1] [c6] dhd_bus_devreset: WLAN OFF DONE[ 14.523752] [6: swapper/0: 1] [c6] wifi_platform_set_power = 0[ 14.530504] [6: swapper/0: 1] [c6] CPU: 6 PID: 1 Comm: swapper/0 Not tainted 3.10.61-svn57 #3[ 14.539939] [6: swapper/0: 1] [c6] Call trace:[ 14.545242] [6: swapper/0: 1] [c6] [] dump_backtrace+0x0/0x110[ 14.553545] [6: swapper/0: 1] [c6] [ ] show_stack+0x10/0x1c[ 14.561507] [6: swapper/0: 1] [c6] [ ] dump_stack+0x1c/0x28[ 14.569415] [6: swapper/0: 1] [c6] [ ] wifi_platform_set_power+0x58/0xd0[ 14.578505] [6: swapper/0: 1] [c6] [ ] dhd_register_if+0x24c/0x274[ 14.587081] [6: swapper/0: 1] [c6] [ ] dhdsdio_probe+0x560/0x5b4[ 14.595417] [6: swapper/0: 1] [c6] [ ] bcmsdh_probe+0x110/0x188[ 14.603719] [6: swapper/0: 1] [c6] [ ] bcmsdh_sdmmc_probe+0x1e4/0x25c[ 14.612557] [6: swapper/0: 1] [c6] [ ] sdio_bus_probe+0x94/0x110[ 14.620955] [6: swapper/0: 1] [c6] [ ] driver_probe_device+0xd4/0x244[ 14.629728] [6: swapper/0: 1] [c6] [ ] __driver_attach+0x60/0x90[ 14.638065] [6: swapper/0: 1] [c6] [ ] bus_for_each_dev+0x74/0x94[ 14.646545] [6: swapper/0: 1] [c6] [ ] driver_attach+0x1c/0x28[ 14.654760] [6: swapper/0: 1] [c6] [ ] bus_add_driver+0xec/0x208[ 14.663091] [6: swapper/0: 1] [c6] [ ] driver_register+0x94/0x110[ 14.671580] [6: swapper/0: 1] [c6] [ ] sdio_register_driver+0x20/0x2c[ 14.680412] [6: swapper/0: 1] [c6] [ ] bcmsdh_register_client_driver+0x14/0x20[ 14.690026] [6: swapper/0: 1] [c6] [ ] bcmsdh_register+0x40/0x70[ 14.698430] [6: swapper/0: 1] [c6] [ ] dhd_bus_register+0x38/0x44[ 14.706854] [6: swapper/0: 1] [c6] [ ] dhd_wifi_platform_load+0x28c/0x3b8[ 14.716033] [6: swapper/0: 1] [c6] [ ] wifi_plat_dev_drv_probe+0x6c/0x84[ 14.725129] [6: swapper/0: 1] [c6] [ ] platform_drv_probe+0x14/0x20[ 14.733777] [6: swapper/0: 1] [c6] [ ] driver_probe_device+0xd4/0x244[ 14.742542] [6: swapper/0: 1] [c6] [ ] __driver_attach+0x60/0x90[ 14.750943] [6: swapper/0: 1] [c6] [ ] bus_for_each_dev+0x74/0x94[ 14.759429] [6: swapper/0: 1] [c6] [ ] driver_attach+0x1c/0x28[ 14.767656] [6: swapper/0: 1] [c6] [ ] bus_add_driver+0xec/0x208[ 14.775994] [6: swapper/0: 1] [c6] [ ] driver_register+0x94/0x110[ 14.784472] [6: swapper/0: 1] [c6] [ ] platform_driver_register+0x58/0x64[ 14.793655] [6: swapper/0: 1] [c6] [ ] dhd_wifi_platform_register_drv+0x158/0x1fc[ 14.803529] [6: swapper/0: 1] [c6] [ ] dhd_module_init+0xa4/0x178[ 14.811958] [6: swapper/0: 1] [c6] [ ] do_one_initcall+0x7c/0x118[ 14.820439] [6: swapper/0: 1] [c6] [ ] kernel_init_freeable+0x148/0x1ec[ 14.829442] [6: swapper/0: 1] [c6] [ ] kernel_init+0xc/0xd4[ 14.837404] [6: swapper/0: 1] [c6] [WLAN] Wifi Power Off.
在此文件的最前加上“#define DHD_DEBUG 1”,打印出此dhd_register_if()的调试信息如下：
[ 14.800308] [7: swapper/0: 1] [c7] dhd_register_if: ifidx 0[ 14.806819] [7: swapper/0: 1] [c7] Dongle Host Driver, version 1.201.59.7 (r506368)[ 14.806819] [7: swapper/0: 1] Compiled in drivers/net/wireless/bcmdhd on Mar 9 2017 at 12:11:53[ 14.825308] [7: swapper/0: 1] [c7] dhd_get_stats: Enter[ 14.831398] [7: swapper/0: 1] [c7] Register interface [wlan0] MAC: ac:83:f3:41:c9:a2[ 14.831398] [7: swapper/0: 1] [ 14.843972] [7: swapper/0: 1] [c7] dhd_prot_ioctl : bus is down. we have nothing to do[ 14.852800] [7: swapper/0: 1] [c7] dhd_net_bus_devreset: wl down failed[ 14.860326] [7: swapper/0: 1] [c7] dhd_os_wd_timer: Enter[ 14.866579] [7: swapper/0: 1] [c7] dhd_txflowcontrol: Enter[ 14.873051] [7: swapper/0: 1] [c7] dhd_bus_stop: Enter[ 14.879146] [7: swapper/0: 1] [c7] bcmsdh_oob_intr_unregister: Enter[ 14.886432] [7: swapper/0: 1] [c7] bcmsdh_oob_intr_unregister: irq is not registered[ 14.895076] [7: swapper/0: 1] [c7] dhdsdio_release_dongle: Enter bus->dhd ffffffc09cb48000 bus->dhd->dongle_reset 0 [ 14.906521] [7: swapper/0: 1] [c7] dhdsdio_clkctl: Enter[ 14.912672] [7: swapper/0: 1] [c7] dhdsdio_sdclk: Enter[ 14.918809] [7: swapper/0: 1] [c7] dhd_os_wd_timer: Enter[ 14.925046] [7: swapper/0: 1] [c7] dhdsdio_clkctl: 1 -> 0[ 14.931359] [7: swapper/0: 1] [c7] dhdsdio_release_dongle: Disconnected[ 14.938827] [7: swapper/0: 1] [c7] dhd_txglom_enable: Enter[ 14.945311] [7: swapper/0: 1] [c7] dhd_txglom_enable: enable 0[ 14.952043] [7: swapper/0: 1] [c7] dhd_conf_set_txglom_params: swtxglom=0, txglom_ext=0[ 14.960894] [7: swapper/0: 1] [c7] dhd_conf_set_txglom_params: txglom_bucket_size=0[ 14.969461] [7: swapper/0: 1] [c7] dhd_conf_set_txglom_params: txglomsize=0, deferred_tx_len=0, bus_txglom=-1[ 14.980289] [7: swapper/0: 1] [c7] dhd_conf_set_txglom_params: tx_in_rx=1, tx_max_offset=0[ 14.989463] [7: swapper/0: 1] [c7] sdioh_set_mode: set txglom_mode to multi-desc[ 14.997773] [7: swapper/0: 1] [c7] dhd_bus_devreset: WLAN OFF DONE[ 15.013292] [7: swapper/0: 1] [c7] wifi_platform_set_power = 0
intdhd_register_if(dhd_pub_t *dhdp, int ifidx, bool need_rtnl_lock){略#if 1 && (defined(BCMPCIE) || (defined(BCMLXSDMMC) && (LINUX_VERSION_CODE >= \ KERNEL_VERSION(2, 6, 27)))) if (ifidx == 0) {#ifdef BCMLXSDMMC up(&dhd_registration_sem);#endif if (!dhd_download_fw_on_driverload) { 进入了这说明失败了 dhd_net_bus_devreset(net, TRUE); #ifdef BCMLXSDMMC dhd_net_bus_suspend(net);#endif /* BCMLXSDMMC */ wifi_platform_set_power(dhdp->info->adapter, FALSE, WIFI_TURNOFF_DELAY); } }#endif /* OEM_ANDROID && (BCMPCIE || (BCMLXSDMMC && KERNEL_VERSION >= 2.6.27)) */ return 0; dhd_download_fw_on_driverload从字面上可以看出是驱动固件是否加载的意思。
查找了了一下这个关键字，仅有两处有赋值：
dhd_linux.c:496:uint dhd_download_fw_on_driverload = TRUE; ／／此处为初始化wl_android.c:2867: dhd_download_fw_on_driverload = FALSE;找到wl_android.c中的相关代码：int wl_android_init(void){ int ret = 0;#ifdef ENABLE_INSMOD_NO_FW_LOAD dhd_download_fw_on_driverload = FALSE;#endif /* ENABLE_INSMOD_NO_FW_LOAD */ 关键看宏ENABLE_INSMOD_NO_FW_LOAD是否定义，在Makefile中找到定义了此宏，难道AP6212不需要加载固件吗，但在defconfig中发现做了配置：
CONFIG_BCMDHD_FW_PATH="system/vendor/firmware/fw_bcmdhd.bin"
CONFIG_BCMDHD_NVRAM_PATH="system/etc/wifi/bcmdhd.cal"
在android中复制了相应芯片firmware并重新命名为以上文件。（参考下面的anroid部分）
在shell中运行netcfg，打印出：
1|root@avl7420:/ # netcfg sit0 DOWN 0.0.0.0/0 0x00000080 00:00:00:00:00:00lo UP 127.0.0.1/8 0x00000049 00:00:00:00:00:00wlan0 DOWN 0.0.0.0/0 0x00001002 ac:83:f3:41:c9:a2ip6tnl0 DOWN 0.0.0.0/0 0x00000080 00:00:00:00:00:00
再执行netcfg –iwlan0 up，打印：
action 'up' failed (Operation not permitted)
此时串口会打印下载固件的信息，也会有错误信息。（此时固件是不正确的）
hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie下有netcfg, wl等文件。以下命令可用于调试：
netcfg, netcfg wlan0 up, wl scan, wl scanresults。
Kernel的改动：
Drivers/net/wireless/bcmdhd/dhd_config.h中注释掉“#define FW_PATH_AUTO_SELECT 1”。
Drivers/net/wireless/bcmdhd/Makefile中删除“ -DENABLE_INSMOD_NO_FW_LOAD \”。
Wifi log
函数dhd_wifi_platform_load_sdio()的log:
[ 12.380428] [6: swapper/0: 1] [c6] ###############################dhd_wifi_platform_load.[ 12.389526] [6: swapper/0: 1] [c6] dhd_wifi_platform_load_sdio //调用此函数[ 12.396274] [6: swapper/0: 1] [c6] Power-up adapter 'DHD generic adapter'[ 12.403912] [6: swapper/0: 1] [c6] - irq 7 [flags 4], firmware: (null), nvram: (null)[ 12.412740] [6: swapper/0: 1] [c6] - bus type -1, bus num -1, slot num -1[ 12.412740] [6: swapper/0: 1] [ 12.424379] [6: swapper/0: 1] [c6] wifi_platform_set_power = 1 //调用wifi_platform_set_power[ 12.431130] [6: swapper/0: 1] [c6] [WLAN] Wifi Power On. //dhd_exynos7420_platdev.c中函数espresso_wifi_power()[ 13.665543] [4: swapper/0: 1] [c4] wifi_platform_bus_enumerate device present 1 //调用wifi_platform_bus_enumerate device()//函数wifi_platform_bus_enumerate()打印[ 13.673764] [4: swapper/0: 1] [c4] espresso_wifi_set_carddetect: 1 [ 13.680860] [4: swapper/0: 1] [c4] shaohua enter set_detect_flag, set detect flag = 1 //退出了函数espresso_wifi_set_carddetect()[ 13.885601] [7: kworker/u16:2: 1063] [c7] shaohua enter check_detect_flag, check detect flag = 1 [ 13.894718] [7: kworker/u16:2: 1063] [c7] shaohua enable detect, continue[ 13.901822] [7: kworker/u16:2: 1063] [c7] shaohua enter clear_detect_flag, clear detect flag = 0 [ 13.940077] [7: kworker/u16:2: 1063] [c7] mmc1: queuing unknown CIS tuple 0x80 (2 bytes)[ 13.950065] [7: kworker/u16:2: 1063] [c7] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)[ 13.960195] [7: kworker/u16:2: 1063] [c7] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)[ 13.971638] [7: kworker/u16:2: 1063] [c7] mmc1: queuing unknown CIS tuple 0x80 (7 bytes)[ 13.983595] [7: kworker/u16:2: 1063] [c7] mmc1: queuing unknown CIS tuple 0x81 (9 bytes)[ 14.077787] [7: kworker/u16:2: 1063] [c7] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot req 400000Hz, actual 396825HZ div = 63)[ 14.090207] [7: kworker/u16:2: 1063] [c7] mmc_host mmc1: Bus speed (slot 0) = 50000000Hz (slot req 50000000Hz, actual 50000000HZ div = 0)[ 14.106961] [7: kworker/u16:2: 1063] [c7] mmc1: new high speed SDIO card at address 0001[ 14.131876] [4: swapper/0: 1] [c4] dhd_bus_register: Enter //执行函数dhd_bus_register//下面这行的打印在Bcmsdh_linux.c[ 14.138285] [4: swapper/0: 1] [c4] bcmsdh_register: register client driver[ 14.146399] [4: swapper/0: 1] [c4] bcmsdh_sdmmc: bcmsdh_sdmmc_probe Enter[ 14.154336] [4: swapper/0: 1] [c4] bcmsdh_sdmmc: bcmsdh_sdmmc_probe Enter[ 14.162059] [4: swapper/0: 1] [c4] bus num (host idx)=1, slot num (rca)=1[ 14.169766] [4: swapper/0: 1] [c4] found adapter info 'DHD generic adapter'[ 14.177580] [4: swapper/0: 1] [c4] found adapter info 'DHD generic adapter'[ 14.185642] [4: swapper/0: 1] [c4] sdioh_attach: set sd_f2_blocksize 128[ 14.194624] [4: swapper/0: 1] [c4] dhdsdio_probe: Enter[ 14.200734] [4: swapper/0: 1] [c4] dhdsdio_probe: venid 0x14e4 devid 0x0000[ 14.208615] [4: swapper/0: 1] [c4] dhdsdio_probe: allow device id 0, will check chip internals[ 14.218987] [4: swapper/0: 1] [c4] F1 signature read @0x18000000=0x1541a9a6[ 14.244207] [4: swapper/0: 1] [c4] Function 0 CIS:[ 14.249948] [4: swapper/0: 1] [c4] 20 04 d0 02 a6 a9 21 02 0c 00 22 04 00 20 00 58 [ 14.259979] [4: swapper/0: 1] [c4] 80 02 00 0b 80 03 02 01 11 80 03 1b 26 07 80 07 [ 14.270019] [4: swapper/0: 1] [c4] 19 ac 83 f3 41 c9 a2 81 09 19 0e ee c0 be 86 ac [ 14.280110] [4: swapper/0: 1] [c4] 48 a7 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.290211] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.300312] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.310343] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.320374] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.330474] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.340575] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.350667] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.360698] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.370799] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.380882] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.390983] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.401083] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.411123] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.421215] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.431316] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.441408] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.451448] [4: swapper/0: 1] [c4] ff [ 14.473756] [4: swapper/0: 1] [c4] Function 1 CIS:[ 14.479416] [4: swapper/0: 1] [c4] 20 04 d0 02 a6 a9 21 02 0c 00 22 2a 01 00 00 00 [ 14.489516] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 40 00 00 ff ff 80 00 00 [ 14.499616] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 14.509717] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 ff [ 14.533842] [4: swapper/0: 1] [c4] Function 2 CIS:[ 14.539561] [4: swapper/0: 1] [c4] 20 04 d0 02 a6 a9 21 02 0c 00 22 2a 01 01 00 00 [ 14.549599] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 00 02 00 ff ff 80 00 00 [ 14.559639] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 00 00 c8 00 00 00 00 00 00 00 [ 14.569739] [4: swapper/0: 1] [c4] 00 00 00 00 00 00 ff [ 14.581734] [4: swapper/0: 1] [c4] F1 signature OK, socitype:0x1 chip:0xa9a6 rev:0x1 pkg:0x4[ 14.592748] [4: swapper/0: 1] [c4] DHD: dongle ram size is set to 524288(orig 524288) at 0x0[ 14.602252] [4: swapper/0: 1] [c4] dhd_attach: Enter[ 14.608151] [4: swapper/0: 1] [c4] found adapter info 'DHD generic adapter'[ 14.616049] [4: swapper/0: 1] [c4] dhd_conf_set_chiprev: chip=0xa9a6, chiprev=1[ 14.624234] [4: swapper/0: 1] [c4] dhd_conf_set_conf_path_by_nv_path: config_path=system/etc/wifi/config.txt[ 14.635353] [5: swapper/0: 1] [c5] wl_create_event_handler(): thread:wl_event_handler:53c started[ 14.635369] [4:wl_event_handle: 1340] [c4] tsk Enter, tsk = 0xffffffc09c5819a0[ 14.652806] [5: swapper/0: 1] [c5] dhd_attach(): thread:dhd_watchdog_thread:53f started[ 14.661948] [5: swapper/0: 1] [c5] dhd_attach(): thread:dhd_dpc:540 started[ 14.669994] [5: swapper/0: 1] [c5] dhd_attach(): thread:dhd_rxf:541 started[ 14.677883] [5: swapper/0: 1] [c5] dhd_deferred_work_init: work queue initialized [ 14.686372] I[5: swapper/0: 1] [c5] dhd_tcpack_suppress_set: 0 -> 2[ 14.693396] I[5: swapper/0: 1] [c5] _tdata_psh_info_pool_init 257: Enter[ 14.700920] [5: swapper/0: 1] [c5] dhdsdio_probe_malloc: Enter[ 14.707615] [5: swapper/0: 1] [c5] dhdsdio_probe_init: Enter[ 14.714563] [5: swapper/0: 1] [c5] dhdsdio_probe_init: Initial value for sd_divisor is 2[ 14.723589] [5: swapper/0: 1] [c5] dhdsdio_probe_init: Initial value for sd_mode is 2[ 14.732336] [5: swapper/0: 1] [c5] dhdsdio_probe_init: Initial value for sd_blocksize is 128[ 14.742785] [5: swapper/0: 1] [c5] Apply overflow WAR: 0x10 0x20 0xa0[ 14.750195] [5: swapper/0: 1] [c5] dhdsdio_probe_init: bus module (through bcmsdh API) does not support chaining[ 14.761281] [5: swapper/0: 1] [c5] dhdsdio_probe: disable SDIO interrupts (not interested yet)[ 14.771200] [5: swapper/0: 1] [c5] dhdsdio_probe: registered SDIO interrupt function ok[ 14.780166] [5: swapper/0: 1] [c5] dhdsdio_probe: completed!![ 14.804081] [5: swapper/0: 1] [c5] dhd_register_if: ifidx 0[ 14.810592] [5: swapper/0: 1] [c5] Dongle Host Driver, version 1.201.59.7 (r506368)[ 14.810592] [5: swapper/0: 1] Compiled in drivers/net/wireless/bcmdhd on Mar 9 2017 at 08:32:18[ 14.829008] [5: swapper/0: 1] [c5] dhd_get_stats: Enter[ 14.835158] [5: swapper/0: 1] [c5] Register interface [wlan0] MAC: ac:83:f3:41:c9:a2[ 14.835158] [5: swapper/0: 1] [ 14.847733] [5: swapper/0: 1] [c5] dhd_prot_ioctl : bus is down. we have nothing to do[ 14.856569] [5: swapper/0: 1] [c5] dhd_net_bus_devreset: wl down failed[ 14.864022] [5: swapper/0: 1] [c5] dhd_os_wd_timer: Enter[ 14.870333] [5: swapper/0: 1] [c5] dhd_txflowcontrol: Enter[ 14.876823] [5: swapper/0: 1] [c5] dhd_bus_stop: Enter[ 14.882903] [5: swapper/0: 1] [c5] bcmsdh_oob_intr_unregister: Enter[ 14.890171] [5: swapper/0: 1] [c5] bcmsdh_oob_intr_unregister: irq is not registered[ 14.898836] [5: swapper/0: 1] [c5] dhdsdio_release_dongle: Enter bus->dhd ffffffc09c508000 bus->dhd->dongle_reset 0 [ 14.910271] [5: swapper/0: 1] [c5] dhdsdio_clkctl: Enter[ 14.916434] [5: swapper/0: 1] [c5] dhdsdio_sdclk: Enter[ 14.922560] [5: swapper/0: 1] [c5] dhd_os_wd_timer: Enter[ 14.928812] [5: swapper/0: 1] [c5] dhdsdio_clkctl: 1 -> 0[ 14.935117] [5: swapper/0: 1] [c5] dhdsdio_release_dongle: Disconnected[ 14.942578] [5: swapper/0: 1] [c5] dhd_txglom_enable: Enter[ 14.949063] [5: swapper/0: 1] [c5] dhd_txglom_enable: enable 0[ 14.955743] [5: swapper/0: 1] [c5] dhd_conf_set_txglom_params: swtxglom=0, txglom_ext=0[ 14.964653] [5: swapper/0: 1] [c5] dhd_conf_set_txglom_params: txglom_bucket_size=0[ 14.973222] [5: swapper/0: 1] [c5] dhd_conf_set_txglom_params: txglomsize=0, deferred_tx_len=0, bus_txglom=-1[ 14.984049] [5: swapper/0: 1] [c5] dhd_conf_set_txglom_params: tx_in_rx=1, tx_max_offset=0[ 14.993224] [5: swapper/0: 1] [c5] sdioh_set_mode: set txglom_mode to multi-desc[ 15.001473] [5: swapper/0: 1] [c5] dhd_bus_devreset: WLAN OFF DONE[ 15.008781] [5: swapper/0: 1] [c5] wifi_platform_set_power = 0[ 15.015549] [5: swapper/0: 1] [c5] [WLAN] Wifi Power Off.[ 15.525586] [5: swapper/0: 1] [c5] [ 15.534774] [5: swapper/0: 1] [c5] ###############################dhd_wifi_platform_load ok.[ 15.544151] [5: swapper/0: 1] [c5] dhd_module_init: Exit err=0
编译
首先看devices目录下BoardConfig.mk:
# Wifi related definesBOARD_WPA_SUPPLICANT_DRIVER := NL80211WPA_SUPPLICANT_VERSION := VER_0_8_XBOARD_WPA_SUPPLICANT_PRIVATE_LIB := lib_driver_cmd_bcmdhdBOARD_HOSTAPD_DRIVER := NL80211BOARD_HOSTAPD_PRIVATE_LIB := lib_driver_cmd_bcmdhdBOARD_WLAN_DEVICE := bcmdhdWIFI_DRIVER_FW_PATH_PARAM := "/sys/module/bcmdhd/parameters/firmware_path"WIFI_DRIVER_FW_PATH_STA := "/vendor/firmware/fw_bcmdhd.bin"WIFI_DRIVER_FW_PATH_AP := "/vendor/firmware/fw_bcmdhd_apsta.bin"
hardware/Broadcom/wlan/Android.mk：
ifeq ($(BOARD_WLAN_DEVICE),bcmdhd) //由于在BoardConfig.mk中定义了这个宏等于bcmdhd include $(call all-subdir-makefiles)endif
进入子目录
<1> config/Android.mk
LOCAL_PATH := $(call my-dir)########################include $(CLEAR_VARS)LOCAL_MODULE := dhcpcd.confLOCAL_MODULE_CLASS := ETCLOCAL_MODULE_PATH := $(TARGET_OUT_ETC)/dhcpcdLOCAL_SRC_FILES := android_dhcpcd.confinclude $(BUILD_PREBUILT)#########################BoardConfig.mk定义了宏WPA_SUPPLICANT_VERSION＝VER_0_8_XWIFI_DRIVER_SOCKET_IFACE := wlan0ifeq ($(strip $(WPA_SUPPLICANT_VERSION)),VER_0_8_X) include external/wpa_supplicant_8/wpa_supplicant/wpa_supplicant_conf.mkelseifeq ($(strip $(WPA_SUPPLICANT_VERSION)),VER_0_6_X) include external/wpa_supplicant_6/wpa_supplicant/wpa_supplicant_conf.mkelse include external/wpa_supplicant/wpa_supplicant_conf.mkendifendif#######################
它做了两件事：<1>复制当前目录下的dhcpcd.conf到/system/etc/dhcpcd/目录下；<2>包含对应版本的wpa_supplicant_conf.mk。
<2>dhdutil/Android.mk编译dhdutil
<3>wifi_hal/Android.mk编译libwifi-hal-bcm
<4> wpa_supplicant_8_lib/Android.mk
LOCAL_PATH := $(call my-dir)BoardConfig.mk定义了宏WPA_SUPPLICANT_VERSION＝VER_0_8_Xifeq ($(WPA_SUPPLICANT_VERSION),VER_0_8_X)BoardConfig.mk定义了宏BOARD_WPA_SUPPLICANT_DRIVER＝NL80211，这个决定了wpa_supplicant的-D参数为nl80211ifneq ($(BOARD_WPA_SUPPLICANT_DRIVER),) CONFIG_DRIVER_$(BOARD_WPA_SUPPLICANT_DRIVER) := yendifWPA_SUPPL_DIR = external/wpa_supplicant_8WPA_SRC_FILE :=include $(WPA_SUPPL_DIR)/wpa_supplicant/android.configWPA_SUPPL_DIR_INCLUDE = $(WPA_SUPPL_DIR)/src \ $(WPA_SUPPL_DIR)/src/common \ $(WPA_SUPPL_DIR)/src/drivers \ $(WPA_SUPPL_DIR)/src/l2_packet \ $(WPA_SUPPL_DIR)/src/utils \ $(WPA_SUPPL_DIR)/src/wps \ $(WPA_SUPPL_DIR)/wpa_supplicantifdef CONFIG_DRIVER_NL80211 有效WPA_SUPPL_DIR_INCLUDE += external/libnl/includeWPA_SRC_FILE += driver_cmd_nl80211.cendififdef CONFIG_DRIVER_WEXTWPA_SRC_FILE += driver_cmd_wext.cendififeq ($(TARGET_ARCH),arm)# To force sizeof(enum) = 4L_CFLAGS += -mabi=aapcs-linuxendififdef CONFIG_ANDROID_LOGL_CFLAGS += -DCONFIG_ANDROID_LOGendififdef CONFIG_P2PL_CFLAGS += -DCONFIG_P2Pendififeq ($(TARGET_USES_64_BIT_BCMDHD),true)L_CFLAGS += -DBCMDHD_64_BIT_IPCendif########################include $(CLEAR_VARS)LOCAL_MODULE := lib_driver_cmd_bcmdhdLOCAL_SHARED_LIBRARIES := libc libcutilsLOCAL_CFLAGS := $(L_CFLAGS)LOCAL_SRC_FILES := $(WPA_SRC_FILE)LOCAL_C_INCLUDES := $(WPA_SUPPL_DIR_INCLUDE)include $(BUILD_STATIC_LIBRARY)########################endif
<5>firmware目录下是broadcom不同类型的wlan芯片的固件，但此目录下没有Android.mk，所以不会执行。但在device/Samsung/avl7420/device.mk中：
BOARD_HAVE_WIFIBT_FIRMWARE := true# wifi/bt chipset name is bcm43241 or bcm43455pcieBOARD_WIFIBT_CHIPSET := bcm43455pcie#wifi firmwareifeq ($(BOARD_HAVE_WIFIBT_FIRMWARE),true)ifeq ($(BOARD_WIFIBT_CHIPSET),bcm43241)$(call inherit-product-if-exists, hardware/broadcom/wlan/bcmdhd/firmware/bcm43241/device-bcm.mk)endififeq ($(BOARD_WIFIBT_CHIPSET),bcm43455pcie)$(call inherit-product-if-exists, hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie/device-bcm.mk)endifendif
此时，它会包含firmware目录下的bcm43455pcie/device-bcm.mk:
########################-include hardware/broadcom/wlan/bcmdhd/config/config-bcm.mk 复制此目录下的两个文件BCM_FW_SRC_FILE_STA := fw_bcmdhd.binBCM_FW_SRC_FILE_AP := fw_bcmdhd_apsta.binBCM_NVRAM_SRC_FILE := bcmdhd.calBCM_WL_SRC_FILE := wlPRODUCT_COPY_FILES += \ hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie/iperf:system/bin/iperf \ hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie/netcfg:system/bin/netcfg \ hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie/wifi_rf_script:system/bin/wifi_rf_script \ hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie/fw_bcmdhd_mfgtest.bin:system/vendor/firmware/fw_bcmdhd_mfgtest.bin \ hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie/$(BCM_FW_SRC_FILE_STA):system/vendor/firmware/fw_bcmdhd.bin \ hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie/$(BCM_FW_SRC_FILE_AP):system/vendor/firmware/fw_bcmdhd_apsta.bin \ hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie/$(BCM_NVRAM_SRC_FILE):system/etc/wifi/bcmdhd.cal \ hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie/$(BCM_WL_SRC_FILE):system/bin/wl########################
做的工作有：
-
复制bcmdhd/config目录下的两个文件；
-
复制另外的文件并重新命名。
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