GPIO output Interrupt handlers in linux (arm)

Question

Can someone point me to some sample code to enable and handle IO input interrupts for user (C language) for ARM9 on Linux?

I know that a low-level driver may be needed, I just want to get some ideas on how to initialize it, and then process messages at the user level, etc.

I am familiar with ARM interrupts and device drivers (on Windows), but I'm new to Linux programming.

thank

Answer 1

BSP, . AFAIK " ARM9 gpio" Linux, . . PCA100:

static int pca100_sdhc2_init(struct device *dev, irq_handler_t detect_irq,
                void *data)
{
        int ret;

        ret = request_irq(IRQ_GPIOC(29), detect_irq,
                          IRQF_DISABLED | IRQF_TRIGGER_FALLING,
                          "imx-mmc-detect", data);
        if (ret)
                printk(KERN_ERR
                        "pca100: Failed to reuest irq for sd/mmc detection\n");

        return ret;
}

static void pca100_sdhc2_exit(struct device *dev, void *data)
{
        free_irq(IRQ_GPIOC(29), data);
}