博通wifi驱动
很早之前自己的笔记，想想还是记录到网上吧
注册
7611 static int __init
7612 dhd_module_init(void)
7613 {
7614 int err;
7615 int retry = POWERUP_MAX_RETRY;
7616
7617 printk("%s: in\n", __FUNCTION__);
7618
7619 DHD_PERIM_RADIO_INIT();
7620
7621 if (firmware_path[0] != '\0') {
7622 strncpy(fw_bak_path, firmware_path, MOD_PARAM_PATHLEN);
7623 fw_bak_path[MOD_PARAM_PATHLEN-1] = '\0';
7624 }
7625
7626 if (nvram_path[0] != '\0') {
7627 strncpy(nv_bak_path, nvram_path, MOD_PARAM_PATHLEN);
7628 nv_bak_path[MOD_PARAM_PATHLEN-1] = '\0';
7629 }
7630
7631 do {
7632 err = dhd_wifi_platform_register_drv();
7633 if (!err) {
7634 register_reboot_notifier(&dhd_reboot_notifier);
7635 break;
7636 }
7637 else {
7638 DHD_ERROR(("%s: Failed to load the driver, try cnt %d\n",
7639 __FUNCTION__, retry));
7640 strncpy(firmware_path, fw_bak_path, MOD_PARAM_PATHLEN);
7641 firmware_path[MOD_PARAM_PATHLEN-1] = '\0';
7642 strncpy(nvram_path, nv_bak_path, MOD_PARAM_PATHLEN);
7643 nvram_path[MOD_PARAM_PATHLEN-1] = '\0';
7644 }
7645 } while (retry--);
7646
7647 if (err)
7648 DHD_ERROR(("%s: Failed to load driver max retry reached**\n", __FUNCTION__));
7649
7650 printk("%s: Exit err=%d\n", __FUNCTION__, err);
7651 return err;
7652 } 该数是博通wifi驱动注册的起始函数，7621~7629获得固件的路径，固件路径在makemenuconfig可以指定。
7632行注册wifi的平台驱动。如果注册成功，则7634行注册一个wifi重启的通知链。
543 int dhd_wifi_platform_register_drv(void)
544 {
545 int err = 0;
...
565 {
566 err = wifi_ctrlfunc_register_drv();
567
568 /* no wifi ctrl func either, load bus directly and ignore this error */
569 if (err) {
570 if (err == -ENXIO) {
571 /* wifi ctrl function does not exist */
572 err = dhd_wifi_platform_load();
573 } else {
574 /* unregister driver due to initialization failure */
575 wifi_ctrlfunc_unregister_drv();
576 }
577 }
578 }
579
580 return err;
581 } 566行注册wifi的相关控制函数。
381 static int wifi_ctrlfunc_register_drv(void)
382 {
383 wifi_adapter_info_t *adapter;
384
385 #ifndef CUSTOMER_HW
386 int err = 0;
387 struct device *dev1, *dev2;
388 dev1 = bus_find_device(&platform_bus_type, NULL, WIFI_PLAT_NAME, wifi_platdev_match);
389 dev2 = bus_find_device(&platform_bus_type, NULL, WIFI_PLAT_NAME2, wifi_platdev_match);
390 #endif
391
392 #if !defined(CONFIG_DTS) && !defined(CUSTOMER_HW)
393 if (!dts_enabled) {
394 if (dev1 == NULL && dev2 == NULL) {
395 DHD_ERROR(("no wifi platform data, skip\n"));
396 return -ENXIO;
397 }
398 }
399 #endif /* !defined(CONFIG_DTS) */
400
401 /* multi-chip support not enabled, build one adapter information for
402 * DHD (either SDIO, USB or PCIe)
403 */
404 adapter = kzalloc(sizeof(wifi_adapter_info_t), GFP_KERNEL);
405 adapter->name = "DHD generic adapter";
406 adapter->bus_type = -1;
407 adapter->bus_num = -1;
408 adapter->slot_num = -1;
409 adapter->irq_num = -1;
410 is_power_on = FALSE;
411 wifi_plat_dev_probe_ret = 0;
412 dhd_wifi_platdata = kzalloc(sizeof(bcmdhd_wifi_platdata_t), GFP_KERNEL);
413 dhd_wifi_platdata->num_adapters = 1;
414 dhd_wifi_platdata->adapters = adapter;
...
435 #if !defined(CONFIG_DTS)
436 if (dts_enabled) {
437 #ifdef CUSTOMER_HW
438 adapter->wifi_plat_data = (void *)&dhd_wlan_control;
439 bcm_wlan_set_plat_data();
440 #ifdef CUSTOMER_OOB
441 adapter->irq_num = bcm_wlan_get_oob_irq();
442 adapter->intr_flags = bcm_wlan_get_oob_irq_flags();
443 #endif
444 #else
445 struct resource *resource;
446 resource = &dhd_wlan_resources;
447 adapter->irq_num = resource->start;
448 adapter->intr_flags = resource->flags & IRQF_TRIGGER_MASK;
449 #endif
450 wifi_plat_dev_probe_ret = dhd_wifi_platform_load();
451 }
452 #endif /* !defined(CONFIG_DTS) */
453
454
455 #if defined(CONFIG_DTS) && !defined(CUSTOMER_HW)
456 wifi_plat_dev_probe_ret = platform_driver_register(&wifi_platform_dev_driver);
457 #endif /* CONFIG_DTS */
458
459 /* return probe function's return value if registeration succeeded */
460 return wifi_plat_dev_probe_ret;
461 } 385~390行，CUSTOMER_HW在makefile中定义了，该宏的意义是使用的用户定制的硬件情况下的驱动注册。392~399行同样略过。
我们使用的wifi模组是sdio接口方式，401～415初始化一个wifiadapter的相关数据结构，在i2c设备驱动中也有adapter的概念。
435~437行，这三行的条件都满足。
438行为adapter的wifi_plat_data成员先占坑。
439行的函数在dmesg出来的启动信息的2.685895秒有显示。其是为438行占坑的指针赋值成员初始化。赋值的这三个成员是平台相关的，如下：
dhd_wlan_control.set_power = bcm_wlan_set_power;
dhd_wlan_control.set_carddetect = bcm_wlan_set_carddetect;
dhd_wlan_control.get_mac_addr = bcm_wlan_get_mac_address;441行获得wifi的中断号，对应于2.686263秒打印出的信息，该中断号是ap6335的13脚（WL_HOST_WAKE）输出信号，该脚的作用是WLAN唤醒AP（应用处理器）。
442行设置该中断的标志为中断，高电平触发，中断资源可以共享。
444~449行是else分支，并没有得到执行。
450行加载wifi的sdio驱动，2.687878打印的信息即进入该函数。其sdio加载函数是
dhd_wifi_platform_load_sdio()。
685 #ifdef BCMSDIO
686 static int dhd_wifi_platform_load_sdio(void)
687 {
688 int i;
689 int err = 0;
690 wifi_adapter_info_t *adapter; //去除没用使用的变量带来的警告，处理编译上的，和功能上没有什么关系。
692 BCM_REFERENCE(i);
693 BCM_REFERENCE(adapter); //参数安全性检查
694 /* Sanity check on the module parameters
695 * - Both watchdog and DPC as tasklets are ok
696 * - If both watchdog and DPC are threads, TX must be deferred
697 */
698 if (!(dhd_watchdog_prio < 0 && dhd_dpc_prio < 0) &&
699 !(dhd_watchdog_prio >= 0 && dhd_dpc_prio >= 0 && dhd_deferred_tx))
700 return -EINVAL; //702行同样在makefile中定义，dhd_wifi_platdata在上面红色那行已经被赋值。
702 #if defined(BCMLXSDMMC)
703 if (dhd_wifi_platdata == NULL) {
704 DHD_ERROR(("DHD wifi platform data is required for Android build\n"));
705 return -EINVAL;
706 } //将dhd_registration_sem这个信号量初始化为0.
708 sema_init(&dhd_registration_sem, 0); //adapter的个数实际上就是1，所以该循环只执行一次/* power up all adapters */
710 for (i = 0; i < dhd_wifi_platdata->num_adapters; i++) {
711 bool chip_up = FALSE;
712 int retry = POWERUP_MAX_RETRY;
713 struct semaphore dhd_chipup_sem;
714
715 adapter = &dhd_wifi_platdata->adapters[i]; //对应于2.688490时刻打印的信息。
717 DHD_ERROR(("Power-up adapter '%s'\n", adapter->name));
718 DHD_INFO((" - irq %d [flags %d], firmware: %s, nvram: %s\n",
719 adapter->irq_num, adapter->intr_flags, adapter->fw_path, adapter->nv_path));
720 DHD_INFO((" - bus type %d, bus num %d, slot num %d\n\n",
721 adapter->bus_type, adapter->bus_num, adapter->slot_num));
722
723 do { //同样是信号量初始化
724 sema_init(&dhd_chipup_sem, 0);
//Register a dummy SDIO client driver in order to be notified of new SDIO device
725 err = dhd_bus_reg_sdio_notify(&dhd_chipup_sem);
726 if (err) {
727 DHD_ERROR(("%s dhd_bus_reg_sdio_notify fail(%d)\n\n",
728 __FUNCTION__, err));
729 return err;
730 } //调用bcm_wlan_set_power，将ap6335的12脚拉低，让其内部电源稳压器工作。上电完成返回TRUE。上电正常返回值err=0。
731 err = wifi_platform_set_power(adapter, TRUE, WIFI_TURNON_DELAY);
732 if (err) {
733 /* WL_REG_ON state unknown, Power off forcely */
734 wifi_platform_set_power(adapter, FALSE, WIFI_TURNOFF_DELAY);
735 continue;
736 } else { //上电成功，则需要枚举设备，3.099935时刻打印的信息。bcm_wlan_set_carddetect
737 wifi_platform_bus_enumerate(adapter, TRUE);
738 err = 0;
739 } //如果成功获取到dhd_chipup_sem，则表示wifi芯片成功powerup，这时表sdio的notify注销掉并跳出这个循环。
741 if (down_timeout(&dhd_chipup_sem, msecs_to_jiffies(POWERUP_WAIT_MS)) == 0) {
742 dhd_bus_unreg_sdio_notify();
743 chip_up = TRUE;
744 break;
745 }//出错处理,省略
...
751 } while (retry--);
...
753 if (!chip_up) {
754 DHD_ERROR(("failed to power up %s, max retry reached**\n", adapter->name));
755 return -ENODEV;
756 }
757
758 } //dhd总线注册
760 err = dhd_bus_register();
761
762 if (err) {
763 DHD_ERROR(("%s: sdio_register_driver failed\n", __FUNCTION__));
764 goto fail;
765 }
766
767
768 /*
769 * Wait till MMC sdio_register_driver callback called and made driver attach.
770 * It's needed to make sync up exit from dhd insmod and
771 * Kernel MMC sdio device callback registration
772 */
773 err = down_timeout(&dhd_registration_sem, msecs_to_jiffies(DHD_REGISTRATION_TIMEOUT));
774 if (err) {
775 DHD_ERROR(("%s: sdio_register_driver timeout or error \n", __FUNCTION__));
776 dhd_bus_unregister();
777 goto fail;
778 }
779
780 return err;
781
782 fail:
783 /* power down all adapters */
784 for (i = 0; i < dhd_wifi_platdata->num_adapters; i++) {
785 adapter = &dhd_wifi_platdata->adapters[i];
786 wifi_platform_set_power(adapter, FALSE, WIFI_TURNOFF_DELAY);
787 wifi_platform_bus_enumerate(adapter, FALSE);
788 }
789 #else
790
791 /* x86 bring-up PC needs no power-up operations */
792 err = dhd_bus_register();
793
794 #endif
795
796 return err;
797 } sdio设备探测函数如下，对应3.100247时刻的输出信息就是下面88行的输出。
82 extern void exynos_dwmci1_notify_change(int state);
83 int bcm_wlan_set_carddetect(bool present)
84 {
85 int err = 0;
86
87 if (present) {
88 printk("======== Card detection to detect SDIO card! ========\n");
89 #ifdef CONFIG_MACH_ODROID_4210
90 exynos_dwmci1_notify_change(1);
91 #endif
92 } else {
93 printk("======== Card detection to remove SDIO card! ========\n");
94 #ifdef CONFIG_MACH_ODROID_4210
95 exynos_dwmci1_notify_change(0);
96 #endif
97 }
98
99 return err;
100 } 由于exynos_dwmci1_notify_change属于mmc的范畴，
157 static void (*_exynos_dwmci1_notify_func)(struct platform_device *, int);
158 void exynos_dwmci1_notify_change(int state)
159 {
160 if (_exynos_dwmci1_notify_func)
161 _exynos_dwmci1_notify_func(&exynos5_device_dwmci1, state);
162 }
163 EXPORT_SYMBOL(exynos_dwmci1_notify_change);
164 _exynos_dwmci1_notify_func是一个函数指针，实际上就是函数dw_mci_notify_change。
307 void __init exynos5_tf4_mmc_init(void)
308 {
309 #ifdef CONFIG_MMC_DW
310 if (samsung_rev() < EXYNOS5410_REV_1_0)
311 smdk5410_dwmci0_pdata.caps &=
312 ~(MMC_CAP_UHS_DDR50 | MMC_CAP_1_8V_DDR);
313 #ifndef CONFIG_EXYNOS_EMMC_HS200
314 smdk5410_dwmci0_pdata.caps2 &=
315 ~MMC_CAP2_HS200_1_8V_SDR;
316 #endif
317 exynos_dwmci_set_platdata(&smdk5410_dwmci0_pdata, 0);
318 exynos_dwmci_set_platdata(&smdk5410_dwmci1_pdata, 1);
319 exynos_dwmci_set_platdata(&smdk5410_dwmci2_pdata, 2);
320 #endif
321 platform_add_devices(smdk5410_mmc_devices,
322 ARRAY_SIZE(smdk5410_mmc_devices));
323 } 数据接收
drivers/net/wireless/bcmdhd/dhd_linux.c
drivers/net/wireless/bcmdhd/dhd_sdio.c
关键函数流程
dhdsdio_probe
dhd_attach
6054 dhd_bus_dpc
5788 dhdsdio_dpc ---
5053 dhdsdio_readframesdrivers/net/wireless/bcmdhd/dhd_linux.c
2855 void
2856 dhd_rx_frame(dhd_pub_t *dhdp, int ifidx, void *pktbuf, int numpkt, uint8 chan)
2857 {
2858 dhd_info_t *dhd = (dhd_info_t *)dhdp->info;
2859 struct sk_buff *skb;
2860 uchar *eth;
2861 uint len;
2862 void *data, *pnext = NULL;
….
3123 if (in_interrupt()) {
3124 netif_rx(skb);
3125 } else {
3126 if (dhd->rxthread_enabled) {
3127 if (!skbhead)
3128 skbhead = skb;
3129 else
3130 PKTSETNEXT(dhdp->osh, skbprev, skb);
3131 skbprev = skb;
3132 } else {
3133
3134 /* If the receive is not processed inside an ISR,
3135 * the softirqd must be woken explicitly to service
3136 * the NET_RX_SOFTIRQ. In 2.6 kernels, this is handled
3137 * by netif_rx_ni(), but in earlier kernels, we need
3138 * to do it manually.
3139 */
3140 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
3141 netif_rx_ni(skb);
3142 #else
3143 ulong flags;
3144 netif_rx(skb);