Messages in this thread | | | Date | Tue, 19 Oct 2010 20:59:10 +0200 | From | Uwe Kleine-König <> | Subject | Re: [PATCHv3 2/2] ARM: imx: Add wake functionality to GPIO |
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On Tue, Oct 19, 2010 at 01:39:52PM -0500, Dinh.Nguyen@freescale.com wrote: > From: Dinh Nguyen <Dinh.Nguyen@freescale.com> > > Add function definition for irq_chip.set_wake to enable GPIO to > wake-up the system. > > This patch is based on Sascha Hauer's imx/linux-2.6 for-rmk tree. > > Signed-off-by: Dinh Nguyen <Dinh.Nguyen@freescale.com> > --- > arch/arm/plat-mxc/gpio.c | 34 +++++++++++++++++++++++++++++++++ > arch/arm/plat-mxc/include/mach/gpio.h | 1 + > 2 files changed, 35 insertions(+), 0 deletions(-) > > diff --git a/arch/arm/plat-mxc/gpio.c b/arch/arm/plat-mxc/gpio.c > index 9d38da0..e52c658 100644 > --- a/arch/arm/plat-mxc/gpio.c > +++ b/arch/arm/plat-mxc/gpio.c > @@ -20,6 +20,7 @@ > */ > > #include <linux/init.h> > +#include <linux/interrupt.h> > #include <linux/io.h> > #include <linux/irq.h> > #include <linux/gpio.h> > @@ -201,11 +202,44 @@ 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..133150e 100644 > --- a/arch/arm/plat-mxc/include/mach/gpio.h > +++ b/arch/arm/plat-mxc/include/mach/gpio.h > @@ -39,6 +39,7 @@ struct mxc_gpio_port { > struct gpio_chip chip; > u32 both_edges; > spinlock_t lock; > + u32 suspend_wakeup; This seems to be a write-only variable. What is the intended purpose?
Is this really enough to let the system wake from suspend?
Best regards Uwe
-- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | http://www.pengutronix.de/ | -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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