Function rt_pic_attach_irq

components/drivers/pic/pic.c:361–417

}

rt_err_t rt_pic_attach_irq(int irq, rt_isr_handler_t handler, void *uid, const char *name, int flags)
{
    rt_err_t err = -RT_EINVAL;
    struct rt_pic_irq *pirq;

    if (handler && name && (pirq = irq2pirq(irq)))
    {
        struct rt_pic_isr *isr = RT_NULL;
        rt_ubase_t level = rt_spin_lock_irqsave(&pirq->rw_lock);

        err = RT_EOK;

        if (!pirq->isr.action.handler)
        {
            /* first attach */
            isr = &pirq->isr;
            rt_list_init(&isr->list);
        }
        else
        {
            rt_spin_unlock_irqrestore(&pirq->rw_lock, level);

            if ((isr = rt_malloc(sizeof(*isr))))
            {
                rt_list_init(&isr->list);

                level = rt_spin_lock_irqsave(&pirq->rw_lock);

                rt_list_insert_after(&pirq->isr.list, &isr->list);
            }
            else
            {
                LOG_E("No memory to save '%s' isr", name);
                err = -RT_ERROR;
            }
        }

        if (!err)
        {
            isr->flags = flags;
            isr->action.handler = handler;
            isr->action.param = uid;
        #ifdef RT_USING_INTERRUPT_INFO
            isr->action.counter = 0;
            rt_strncpy(isr->action.name, name, RT_NAME_MAX - 1);
            isr->action.name[RT_NAME_MAX - 1] = '\0';
        #ifdef RT_USING_SMP
            rt_memset(isr->action.cpu_counter, 0, sizeof(isr->action.cpu_counter));
        #endif
        #endif

            rt_spin_unlock_irqrestore(&pirq->rw_lock, level);
        }
    }

    return err;
}