Re: [PATCH 1/2] ARM: imx: Add wake functionality to GPIO

From: Sascha Hauer
Date: Mon Oct 18 2010 - 03:42:41 EST


Hi,

On Fri, Oct 15, 2010 at 03:18:27PM -0500, Dinh.Nguyen@xxxxxxxxxxxxx wrote:
> From: Dinh Nguyen <Dinh.Nguyen@xxxxxxxxxxxxx>
>
> Add function definition for irq_chip.set_wake to enable GPIO to
> wake-up the system.
>
> Signed-off-by: Dinh Nguyen <Dinh.Nguyen@xxxxxxxxxxxxx>
> ---
> arch/arm/plat-mxc/gpio.c | 35 +++++++++++++++++++++++++++++++++
> arch/arm/plat-mxc/include/mach/gpio.h | 3 ++
> 2 files changed, 38 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/plat-mxc/gpio.c b/arch/arm/plat-mxc/gpio.c
> index 57ec4a8..7647ba3 100644
> --- a/arch/arm/plat-mxc/gpio.c
> +++ b/arch/arm/plat-mxc/gpio.c
> @@ -20,9 +20,11 @@
> */
>
> #include <linux/init.h>
> +#include <linux/interrupt.h>
> #include <linux/io.h>
> #include <linux/irq.h>
> #include <linux/gpio.h>
> +#include <mach/gpio.h>
> #include <mach/hardware.h>
> #include <asm-generic/bug.h>
>
> @@ -201,11 +203,44 @@ static void mx2_gpio_irq_handler(u32 irq, struct irq_desc *desc)
> }
> }
>
> +/*
> + * Set interrupt number "irq" in the GPIO as a wake-up source.
> + * While system is running, all registered GPIO interrupts need to have
> + * wake-up enabled. When system is suspended, only selected GPIO interrupts
> + * need to have wake-up enabled.
> + * @param irq interrupt source number
> + * @param enable enable as wake-up if equal to non-zero
> + * @return This function returns 0 on success.
> + */
> +static int gpio_set_wake_irq(u32 irq, u32 enable)
> +{
> + u32 gpio = irq_to_gpio(irq);
> + u32 gpio_idx = gpio & 0x1F;
> + struct mxc_gpio_port *port = &mxc_gpio_ports[gpio / 32];
> +
> + if (enable) {
> + port->suspend_wakeup |= (1 << gpio_idx);
> + if (port->irq_high && (gpio_idx >= 16))
> + enable_irq_wake(port->irq_high);
> + else
> + enable_irq_wake(port->irq);
> + } else {
> + port->suspend_wakeup &= ~(1 << gpio_idx);
> + if (port->irq_high && (gpio_idx >= 16))
> + disable_irq_wake(port->irq_high);
> + else
> + disable_irq_wake(port->irq);
> + }
> +
> + return 0;
> +}
> +
> static struct irq_chip gpio_irq_chip = {
> .ack = gpio_ack_irq,
> .mask = gpio_mask_irq,
> .unmask = gpio_unmask_irq,
> .set_type = gpio_set_irq_type,
> + .set_wake = gpio_set_wake_irq,
> };
>
> static void _set_gpio_direction(struct gpio_chip *chip, unsigned offset,
> diff --git a/arch/arm/plat-mxc/include/mach/gpio.h b/arch/arm/plat-mxc/include/mach/gpio.h
> index af33b74..dba3768 100644
> --- a/arch/arm/plat-mxc/include/mach/gpio.h
> +++ b/arch/arm/plat-mxc/include/mach/gpio.h
> @@ -39,6 +39,9 @@ struct mxc_gpio_port {
> struct gpio_chip chip;
> u32 both_edges;
> spinlock_t lock;
> + u32 suspend_wakeup;

This variable seems unused.

> + u32 saved_wakeup;
> +
> };

Please remove that empty line.

Sascha

--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/