> > I'm interested in bringing headset detection feature for audio. The
> > detection is done through TWL GPIO_2. How can I configure a GPIO pin
> > to generate an interrupt? Is there any API? Could you please point
> > out another driver using that functionality so I can use as reference?
>In the setup() callback for the TWL4030 GPIOs:
> {
> int GPIO_NUMBER = gpio_base + 2;
> gpio_request(GPIO_NUMBER, "Headset IRQ");
> gpio_direction_input(GPIO_NUMBER);
> lm8323_board_info.irq = gpio_to_irq(GPIO_NUMBER);
> ... something registers this board_info ...
> return 0;
> }
>
> and then later the lm8323 driver will use that IRQ:
>
> request_irq(client->irq, lm8323_irq, flags | IRQF_SHARED, DRIVER_NAME, dev);
>
> that should do it :-)
>
> see that GPIO_NUMBER will be gpio_base + 2, base is board-specific
>
> .... and hence client->irq is also board-specific,
> which is why it needs to be set up
In the particular case of ALSA SoC, could the machine/board driver be a better
place to handle all GPIO/IRQ configuration? That driver also contains only
board specific code.--
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