On Fri, 7 Dec 2012 16:01:39 +0200, Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx> wrote:
> Add gpio support for Intel Lynxpoint chipset.
> Lynxpoint supports 94 gpio pins which can generate interrupts.
> Driver will fail requests for pins that are marked as owned by ACPI, or
> set in an alternate mode (non-gpio).
>
> Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
> ---
> +static void lp_gpio_set(struct gpio_chip *chip, unsigned gpio, int value)
> +{
> + struct lp_gpio *lg = container_of(chip, struct lp_gpio, chip);
> + unsigned long reg = gpio_reg(chip, gpio, LP_CONFIG1);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&lg->lock, flags);
> +
> + if (value)
> + outl(inl(reg) | OUT_LVL_BIT, reg);
> + else
> + outl(inl(reg) & ~OUT_LVL_BIT, reg);
> +
> + spin_unlock_irqrestore(&lg->lock, flags);
> +}
A *lot* of drivers implement their own GPIO ops like this, and they all
end up looking the same. Please take a look at
drivers/gpio/gpio-generic.c and see if you can use the stock operations
provided there.
g.
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