2 files changed, 74 insertions, 15 deletions

diff --git a/arch/arm/mach-ixp4xx/nas100d-power.c b/arch/arm/mach-ixp4xx/nas100d-power.c
index 29aa98d3a7fa..4c1c01bb3fe2 100644
--- a/arch/arm/mach-ixp4xx/nas100d-power.c
+++ b/arch/arm/mach-ixp4xx/nas100d-power.c
@@ -21,15 +21,59 @@
 #include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/reboot.h>
+#include <linux/jiffies.h>
+#include <linux/timer.h>
 
+#include <asm/gpio.h>
 #include <asm/mach-types.h>
 
-static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
+/* This is used to make sure the power-button pusher is serious.  The button
+ * must be held until the value of this counter reaches zero.
+ */
+static int power_button_countdown;
+
+/* Must hold the button down for at least this many counts to be processed */
+#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
+
+static void nas100d_power_handler(unsigned long data);
+static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler, 0, 0);
+
+static void nas100d_power_handler(unsigned long data)
 {
-	/* Signal init to do the ctrlaltdel action, this will bypass init if
-	 * it hasn't started and do a kernel_restart.
+	/* This routine is called twice per second to check the
+	 * state of the power button.
 	 */
-	ctrl_alt_del();
+
+	if (gpio_get_value(NAS100D_PB_GPIO)) {
+
+		/* IO Pin is 1 (button pushed) */
+		if (power_button_countdown > 0)
+			power_button_countdown--;
+
+	} else {
+
+		/* Done on button release, to allow for auto-power-on mods. */
+		if (power_button_countdown == 0) {
+			/* Signal init to do the ctrlaltdel action,
+			 * this will bypass init if it hasn't started
+			 * and do a kernel_restart.
+			 */
+			ctrl_alt_del();
+
+			/* Change the state of the power LED to "blink" */
+			gpio_line_set(NAS100D_LED_PWR_GPIO, IXP4XX_GPIO_LOW);
+		} else {
+			power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
+		}
+	}
+
+	mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
+}
+
+static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
+{
+	/* This is the paper-clip reset, it shuts the machine down directly. */
+	machine_power_off();
 
 	return IRQ_HANDLED;
 }
@@ -39,17 +83,30 @@ static int __init nas100d_power_init(void)
 	if (!(machine_is_nas100d()))
 		return 0;
 
-	set_irq_type(NAS100D_RB_IRQ, IRQT_LOW);
+	set_irq_type(gpio_to_irq(NAS100D_RB_GPIO), IRQT_LOW);
 
-	if (request_irq(NAS100D_RB_IRQ, &nas100d_reset_handler,
+	if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
 		IRQF_DISABLED, "NAS100D reset button", NULL) < 0) {
 
 		printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
-			NAS100D_RB_IRQ);
+			gpio_to_irq(NAS100D_RB_GPIO));
 
 		return -EIO;
 	}
 
+	/* The power button on the Iomega NAS100d is on GPIO 14, but
+	 * it cannot handle interrupts on that GPIO line.  So we'll
+	 * have to poll it with a kernel timer.
+	 */
+
+	/* Make sure that the power button GPIO is set up as an input */
+	gpio_line_config(NAS100D_PB_GPIO, IXP4XX_GPIO_IN);
+
+	/* Set the initial value for the power button IRQ handler */
+	power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
+
+	mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
+
 	return 0;
 }
 
@@ -58,7 +115,9 @@ static void __exit nas100d_power_exit(void)
 	if (!(machine_is_nas100d()))
 		return;
 
-	free_irq(NAS100D_RB_IRQ, NULL);
+	del_timer_sync(&nas100d_power_timer);
+
+	free_irq(gpio_to_irq(NAS100D_RB_GPIO), NULL);
 }
 
 module_init(nas100d_power_init);
diff --git a/arch/arm/mach-ixp4xx/nas100d-setup.c b/arch/arm/mach-ixp4xx/nas100d-setup.c
index 54d884fb2517..213a4cea9117 100644
--- a/arch/arm/mach-ixp4xx/nas100d-setup.c
+++ b/arch/arm/mach-ixp4xx/nas100d-setup.c
@@ -43,20 +43,20 @@ static struct platform_device nas100d_flash = {
 static struct resource nas100d_led_resources[] = {
 	{
 		.name		= "wlan",   /* green led */
-		.start		= 0,
-		.end		= 0,
+		.start		= NAS100D_LED_WLAN_GPIO,
+		.end		= NAS100D_LED_WLAN_GPIO,
 		.flags		= IXP4XX_GPIO_LOW,
 	},
 	{
-		.name		= "ready",  /* blue power led (off is flashing!) */
-		.start		= 15,
-		.end		= 15,
+		.name		= "power",  /* blue power led (off=flashing) */
+		.start		= NAS100D_LED_PWR_GPIO,
+		.end		= NAS100D_LED_PWR_GPIO,
 		.flags		= IXP4XX_GPIO_LOW,
 	},
 	{
 		.name		= "disk",   /* yellow led */
-		.start		= 3,
-		.end		= 3,
+		.start		= NAS100D_LED_DISK_GPIO,
+		.end		= NAS100D_LED_DISK_GPIO,
 		.flags		= IXP4XX_GPIO_LOW,
 	},
 };