用钩子钩住你的中断处理函数

         Atheros的AP83的解决方案中，gpio的中断服务程序中设置了一个中断处理函数的入口，这个入口可以在其他方便的驱动程序中注册，就像一个钩子函数，感觉用法挺不错的，现在把它的框架记录下来。

int __init pbXX_simple_config_init(void)

{

    req = request_irq (AR7100_GPIO_IRQn(JUMPSTART_GPIO), jumpstart_irq, 0,

                       "SW JUMPSTART", NULL);

    return 0;

}

 

irqreturn_t jumpstart_irq(int cpl, void *dev_id, struct pt_regs *regs)

{

    printk ("calling simple_config callback..\n");

 

    if (registered_cb) {

        return registered_cb (cpl, cb_arg, regs);

    }

    return IRQ_HANDLED;

}

 

typedef irqreturn_t(*sc_callback_t)(int, void *, struct pt_regs *);

static sc_callback_t registered_cb = NULL;

static void *cb_arg;

 

void register_simple_config_callback (void *callback, void *arg)

{

    registered_cb = (sc_callback_t) callback;

    cb_arg = arg;

}

EXPORT_SYMBOL(register_simple_config_callback);

 

void unregister_simple_config_callback (void)

{

    registered_cb = NULL;

    cb_arg = NULL;

}

EXPORT_SYMBOL(unregister_simple_config_callback);

 

In madwifi driver

    /* Request Simple Config intr handler */

    register_simple_config_callback ((void *) jumpstart_intr, (void *) dev);

 

 

/*

 * Handler for front panel SW jumpstart switch

 */

static irqreturn_t

jumpstart_intr (int cpl, void *dev_id, struct pt_regs *regs)

{

    struct net_device *dev = dev_id;

    struct ath_softc_net80211 *scn = dev->priv;

    struct ieee80211com *ic = &scn->sc_ic;

    struct ieee80211vap *vap;

 

    vap = TAILQ_FIRST(&ic->ic_vaps);

    if (vap != NULL) {

        ieee80211_notify_push_button (vap);

    }

    return IRQ_HANDLED;

}

 

这个函数就是这个GPIO中断最后对应的处理函数。