Embest SBC8140 User Manual download pdf (Page 61)

Page | 55

" direction for GPIO %d, error %d\n",

button->gpio, error);

goto fail3;

}

irq = gpio_to_irq(button->gpio);

if (irq < 0) {

error = irq;

dev_err(dev, "Unable to get irq number for GPIO

%d, error %d\n",

button->gpio, error);

goto fail3;

}

error = request_irq(irq, gpio_keys_isr,

IRQF_SHARED |

IRQF_TRIGGER_RISING |

IRQF_TRIGGER_FALLING,

desc, bdata);

if (error) {

dev_err(dev, "Unable to claim irq %d; error %d\n",

irq, error);

goto fail3;

}

return 0;

fail3:

gpio_free(button->gpio);

fail2:

return error;

}

Interrupt processing; an interrupt is generated when pressing a button,

and then a key value will be returned;

static irqreturn_t gpio_keys_isr(int irq, void *dev_id)

{

…

schedule_work(&bdata->work);

…

}

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Embest SBC8140 User Manual Page 61