BCM43438 android6.0移植
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编译的全部源码位于drivers/net/wireless/bcmdhd目录下。
初始化流程：
-
dhd_linux.c中dhd_module_init()调用dhd_wifi_platform_register_drv()
-
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/include
DHDCFLAGS += \\
-DBCMSDIO -DMMC_SDIO_ABORT -DBCMLXSDMMC -DUSE_SDIOFIFO_IOVAR \\
-DBDC -DPROP_TXSTATUS -DDHD_USE_IDLECOUNT -DBCMSDIOH_TXGLOM \\
-DCUSTOM_SDIO_F2_BLKSIZE=128dhd_wifi_platform_load_sdio()代码：
#ifdef BCMSDIO
static 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.c
int bcmsdh_reg_sdio_notify(void* semaphore)
return sdio_func_reg_notify(semaphore);
Bcmsdh_emmc_linux.c
int 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.c
static bcmsdh_driver_t dhd_sdio =
dhdsdio_probe,
dhdsdio_disconnect,
dhdsdio_suspend,
dhdsdio_resume
;
int
dhd_bus_register(void)
DHD_TRACE(("%s: Enter\\n", __FUNCTION__));
return bcmsdh_register(&dhd_sdio);
Bcmsdh_linux.c
int
bcmsdh_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.c
int 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] [<ffffffc000087968>] dump_backtrace+0x0/0x110
[ 14.553545] [6: swapper/0: 1] [c6] [<ffffffc000087a88>] show_stack+0x10/0x1c
[ 14.561507] [6: swapper/0: 1] [c6] [<ffffffc000761014>] dump_stack+0x1c/0x28
[ 14.569415] [6: swapper/0: 1] [c6] [<ffffffc000432b90>] wifi_platform_set_power+0x58/0xd0
[ 14.578505] [6: swapper/0: 1] [c6] [<ffffffc00042d8b0>] dhd_register_if+0x24c/0x274
[ 14.587081] [6: swapper/0: 1] [c6] [<ffffffc00044f904>] dhdsdio_probe+0x560/0x5b4
[ 14.595417] [6: swapper/0: 1] [c6] [<ffffffc000448740>] bcmsdh_probe+0x110/0x188
[ 14.603719] [6: swapper/0: 1] [c6] [<ffffffc00044b6e8>] bcmsdh_sdmmc_probe+0x1e4/0x25c
[ 14.612557] [6: swapper/0: 1] [c6] [<ffffffc000535b9c>] sdio_bus_probe+0x94/0x110
[ 14.620955] [6: swapper/0: 1] [c6] [<ffffffc0003cad98>] driver_probe_device+0xd4/0x244
[ 14.629728] [6: swapper/0: 1] [c6] [<ffffffc0003cafb4>] __driver_attach+0x60/0x90
[ 14.638065] [6: swapper/0: 1] [c6] [<ffffffc0003c9510>] bus_for_each_dev+0x74/0x94
[ 14.646545] [6: swapper/0: 1] [c6] [<ffffffc0003cac58>] driver_attach+0x1c/0x28
[ 14.654760] [6: swapper/0: 1] [c6] [<ffffffc0003c9d28>] bus_add_driver+0xec/0x208
[ 14.663091] [6: swapper/0: 1] [c6] [<ffffffc0003cb7f0>] driver_register+0x94/0x110
[ 14.671580] [6: swapper/0: 1] [c6] [<ffffffc000535c70>] sdio_register_driver+0x20/0x2c
[ 14.680412] [6: swapper/0: 1] [c6] [<ffffffc00044b8d4>] bcmsdh_register_client_driver+0x14/0x20
[ 14.690026] [6: swapper/0: 1] [c6] [<ffffffc0004488d4>] bcmsdh_register+0x40/0x70
[ 14.698430] [6: swapper/0: 1] [c6] [<ffffffc000456ce4>] dhd_bus_register+0x38/0x44
[ 14.706854] [6: swapper/0: 1] [c6] [<ffffffc000432f50>] dhd_wifi_platform_load+0x28c/0x3b8
[ 14.716033] [6: swapper/0: 1] [c6] [<ffffffc0004330e8>] wifi_plat_dev_drv_probe+0x6c/0x84
[ 14.725129] [6: swapper/0: 1] [c6] [<ffffffc0003cc12c>] platform_drv_probe+0x14/0x20
[ 14.733777] [6: swapper/0: 1] [c6] [<ffffffc0003cad98>] driver_probe_device+0xd4/0x244
[ 14.742542] [6: swapper/0: 1] [c6] [<ffffffc0003cafb4>] __driver_attach+0x60/0x90
[ 14.750943] [6: swapper/0: 1] [c6] [<ffffffc0003c9510>] bus_for_each_dev+0x74/0x94
[ 14.759429] [6: swapper/0: 1] [c6] [<ffffffc0003cac58>] driver_attach+0x1c/0x28
[ 14.767656] [6: swapper/0: 1] [c6] [<ffffffc0003c9d28>] bus_add_driver+0xec/0x208
[ 14.775994] [6: swapper/0: 1] [c6] [<ffffffc0003cb7f0>] driver_register+0x94/0x110
[ 14.784472] [6: swapper/0: 1] [c6] [<ffffffc0003cca6c>] platform_driver_register+0x58/0x64
[ 14.793655] [6: swapper/0: 1] [c6] [<ffffffc000433490>] dhd_wifi_platform_register_drv+0x158/0x1fc
[ 14.803529] [6: swapper/0: 1] [c6] [<ffffffc000a3104c>] dhd_module_init+0xa4/0x178
[ 14.811958] [6: swapper/0: 1] [c6] [<ffffffc000a09894>] do_one_initcall+0x7c/0x118
[ 14.820439] [6: swapper/0: 1] [c6] [<ffffffc000a09a78>] kernel_init_freeable+0x148/0x1ec
[ 14.829442] [6: swapper/0: 1] [c6] [<ffffffc00075aa34>] 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 = 0int
dhd_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 00:00:00:00:00:00
lo UP 127.0.0.1/8 0x00000049 00:00:00:00:00:00
wlan0 DOWN 0.0.0.0/0 0x00001002 ac:83:f3:41:c9:a2
ip6tnl0 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 defines
BOARD_WPA_SUPPLICANT_DRIVER := NL80211
WPA_SUPPLICANT_VERSION := VER_0_8_X
BOARD_WPA_SUPPLICANT_PRIVATE_LIB := lib_driver_cmd_bcmdhd
BOARD_HOSTAPD_DRIVER := NL80211
BOARD_HOSTAPD_PRIVATE_LIB := lib_driver_cmd_bcmdhd
BOARD_WLAN_DEVICE := bcmdhd
WIFI_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.conf
LOCAL_MODULE_CLASS := ETC
LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)/dhcpcd
LOCAL_SRC_FILES := android_dhcpcd.conf
include $(BUILD_PREBUILT)
#########################
BoardConfig.mk定义了宏WPA_SUPPLICANT_VERSION＝VER_0_8_X
WIFI_DRIVER_SOCKET_IFACE := wlan0
ifeq ($(strip $(WPA_SUPPLICANT_VERSION)),VER_0_8_X)
include external/wpa_supplicant_8/wpa_supplicant/wpa_supplicant_conf.mk
else
ifeq ($(strip $(WPA_SUPPLICANT_VERSION)),VER_0_6_X)
include external/wpa_supplicant_6/wpa_supplicant/wpa_supplicant_conf.mk
else
include external/wpa_supplicant/wpa_supplicant_conf.mk
endif
endif
#######################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 := $(call my-dir)
BoardConfig.mk定义了宏WPA_SUPPLICANT_VERSION＝VER_0_8_X
ifeq ($(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nl80211
ifneq ($(BOARD_WPA_SUPPLICANT_DRIVER),)
CONFIG_DRIVER_$(BOARD_WPA_SUPPLICANT_DRIVER) := y
endif
WPA_SUPPL_DIR = external/wpa_supplicant_8
WPA_SRC_FILE :=
include $(WPA_SUPPL_DIR)/wpa_supplicant/android.config
WPA_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 \\
$(WPA_SUPPL_DIR)/wpa_supplicant
ifdef CONFIG_DRIVER_NL80211 有效
WPA_SUPPL_DIR_INCLUDE += external/libnl/include
WPA_SRC_FILE += driver_cmd_nl80211.c
endif
ifdef CONFIG_DRIVER_WEXT
WPA_SRC_FILE += driver_cmd_wext.c
endif
ifeq ($(TARGET_ARCH),arm)
# To force sizeof(enum) = 4
L_CFLAGS += -mabi=aapcs-linux
endif
ifdef CONFIG_ANDROID_LOG
L_CFLAGS += -DCONFIG_ANDROID_LOG
endif
ifdef CONFIG_P2P
L_CFLAGS += -DCONFIG_P2P
endif
ifeq ($(TARGET_USES_64_BIT_BCMDHD),true)
L_CFLAGS += -DBCMDHD_64_BIT_IPC
endif
########################
include $(CLEAR_VARS)
LOCAL_MODULE := lib_driver_cmd_bcmdhd
LOCAL_SHARED_LIBRARIES := libc libcutils
LOCAL_CFLAGS := $(L_CFLAGS)
LOCAL_SRC_FILES := $(WPA_SRC_FILE)
LOCAL_C_INCLUDES := $(WPA_SUPPL_DIR_INCLUDE)
include $(BUILD_STATIC_LIBRARY)
########################
endif<5>firmware目录下是broadcom不同类型的wlan芯片的固件，但此目录下没有Android.mk，所以不会执行。但在device/Samsung/avl7420/device.mk中：
BOARD_HAVE_WIFIBT_FIRMWARE := true
# wifi/bt chipset name is bcm43241 or bcm43455pcie
BOARD_WIFIBT_CHIPSET := bcm43455pcie
#wifi firmware
ifeq ($(BOARD_HAVE_WIFIBT_FIRMWARE),true)
ifeq ($(BOARD_WIFIBT_CHIPSET),bcm43241)
$(call inherit-product-if-exists, hardware/broadcom/wlan/bcmdhd/firmware/bcm43241/device-bcm.mk)
endif
ifeq ($(BOARD_WIFIBT_CHIPSET),bcm43455pcie)
$(call inherit-product-if-exists, hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie/device-bcm.mk)
endif
endif此时，它会包含firmware目录下的bcm43455pcie/device-bcm.mk:
########################
-include hardware/broadcom/wlan/bcmdhd/config/config-bcm.mk 复制此目录下的两个文件
BCM_FW_SRC_FILE_STA := fw_bcmdhd.bin
BCM_FW_SRC_FILE_AP := fw_bcmdhd_apsta.bin
BCM_NVRAM_SRC_FILE := bcmdhd.cal
BCM_WL_SRC_FILE := wl
PRODUCT_COPY_FILES += \\
hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie/iperf:system/bin/iperf \\
hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie/netcfg:system/bin/netcfg \\
hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie/wifi_rf_script:system/bin/wifi_rf_script \\
hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie/fw_bcmdhd_mfgtest.bin:system/vendor/firmware/fw_bcmdhd_mfgtest.bin \\
hardware/broadcom/wlan/bcmdhd/firmware/bcm43455pcie/$(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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