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198 lines
6.0 KiB
Diff
198 lines
6.0 KiB
Diff
From 6261e59795d861f21f63878944900a3da713348c Mon Sep 17 00:00:00 2001
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From: Rod Whitby <rod@whitby.id.au>
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Date: Tue, 29 Jan 2008 09:53:46 +1030
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Subject: ixp4xx: Button and LED updates for the nas100d board (Patch #4768)
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* Convert GPIO and IRQ handling to use the <asm/gpio.h> api.
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* Perform the reset only after the power button has been held down
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for at least two seconds. Do the reset on the release of the power
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button, so that NAS devices which have been set to auto-power-on (by
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solder bridging the power button) do not continuously power cycle.
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* Remove all superflous constants from nas100d.h
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* Add LED constants to nas100d.h while we're there.
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* Update the board LED setup code to use those constants.
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Signed-off-by: Rod Whitby <rod@whitby.id.au>
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Acked-by: Lennert Buytenhek <buytenh@wantstofly.org>
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PATCH FOLLOWS
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KernelVersion: 2.6.24-git5
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diff --git a/arch/arm/mach-ixp4xx/nas100d-power.c b/arch/arm/mach-ixp4xx/nas100d-power.c
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index 29aa98d..4c1c01b 100644
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--- a/arch/arm/mach-ixp4xx/nas100d-power.c
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+++ b/arch/arm/mach-ixp4xx/nas100d-power.c
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@@ -21,15 +21,59 @@
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/reboot.h>
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+#include <linux/jiffies.h>
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+#include <linux/timer.h>
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+#include <asm/gpio.h>
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#include <asm/mach-types.h>
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-static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
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+/* This is used to make sure the power-button pusher is serious. The button
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+ * must be held until the value of this counter reaches zero.
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+ */
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+static int power_button_countdown;
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+
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+/* Must hold the button down for at least this many counts to be processed */
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+#define PBUTTON_HOLDDOWN_COUNT 4 /* 2 secs */
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+
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+static void nas100d_power_handler(unsigned long data);
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+static DEFINE_TIMER(nas100d_power_timer, nas100d_power_handler, 0, 0);
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+
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+static void nas100d_power_handler(unsigned long data)
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{
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- /* Signal init to do the ctrlaltdel action, this will bypass init if
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- * it hasn't started and do a kernel_restart.
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+ /* This routine is called twice per second to check the
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+ * state of the power button.
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*/
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- ctrl_alt_del();
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+
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+ if (gpio_get_value(NAS100D_PB_GPIO)) {
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+
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+ /* IO Pin is 1 (button pushed) */
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+ if (power_button_countdown > 0)
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+ power_button_countdown--;
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+
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+ } else {
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+
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+ /* Done on button release, to allow for auto-power-on mods. */
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+ if (power_button_countdown == 0) {
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+ /* Signal init to do the ctrlaltdel action,
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+ * this will bypass init if it hasn't started
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+ * and do a kernel_restart.
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+ */
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+ ctrl_alt_del();
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+
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+ /* Change the state of the power LED to "blink" */
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+ gpio_line_set(NAS100D_LED_PWR_GPIO, IXP4XX_GPIO_LOW);
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+ } else {
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+ power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
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+ }
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+ }
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+
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+ mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
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+}
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+
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+static irqreturn_t nas100d_reset_handler(int irq, void *dev_id)
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+{
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+ /* This is the paper-clip reset, it shuts the machine down directly. */
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+ machine_power_off();
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return IRQ_HANDLED;
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}
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@@ -39,17 +83,30 @@ static int __init nas100d_power_init(void)
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if (!(machine_is_nas100d()))
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return 0;
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- set_irq_type(NAS100D_RB_IRQ, IRQT_LOW);
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+ set_irq_type(gpio_to_irq(NAS100D_RB_GPIO), IRQT_LOW);
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- if (request_irq(NAS100D_RB_IRQ, &nas100d_reset_handler,
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+ if (request_irq(gpio_to_irq(NAS100D_RB_GPIO), &nas100d_reset_handler,
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IRQF_DISABLED, "NAS100D reset button", NULL) < 0) {
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printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
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- NAS100D_RB_IRQ);
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+ gpio_to_irq(NAS100D_RB_GPIO));
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return -EIO;
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}
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+ /* The power button on the Iomega NAS100d is on GPIO 14, but
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+ * it cannot handle interrupts on that GPIO line. So we'll
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+ * have to poll it with a kernel timer.
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+ */
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+
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+ /* Make sure that the power button GPIO is set up as an input */
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+ gpio_line_config(NAS100D_PB_GPIO, IXP4XX_GPIO_IN);
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+
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+ /* Set the initial value for the power button IRQ handler */
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+ power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
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+
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+ mod_timer(&nas100d_power_timer, jiffies + msecs_to_jiffies(500));
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+
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return 0;
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}
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@@ -58,7 +115,9 @@ static void __exit nas100d_power_exit(void)
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if (!(machine_is_nas100d()))
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return;
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- free_irq(NAS100D_RB_IRQ, NULL);
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+ del_timer_sync(&nas100d_power_timer);
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+
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+ free_irq(gpio_to_irq(NAS100D_RB_GPIO), NULL);
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}
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module_init(nas100d_power_init);
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diff --git a/arch/arm/mach-ixp4xx/nas100d-setup.c b/arch/arm/mach-ixp4xx/nas100d-setup.c
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index 54d884f..213a4ce 100644
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--- a/arch/arm/mach-ixp4xx/nas100d-setup.c
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+++ b/arch/arm/mach-ixp4xx/nas100d-setup.c
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@@ -43,20 +43,20 @@ static struct platform_device nas100d_flash = {
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static struct resource nas100d_led_resources[] = {
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{
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.name = "wlan", /* green led */
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- .start = 0,
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- .end = 0,
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+ .start = NAS100D_LED_WLAN_GPIO,
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+ .end = NAS100D_LED_WLAN_GPIO,
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.flags = IXP4XX_GPIO_LOW,
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},
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{
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- .name = "ready", /* blue power led (off is flashing!) */
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- .start = 15,
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- .end = 15,
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+ .name = "power", /* blue power led (off=flashing) */
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+ .start = NAS100D_LED_PWR_GPIO,
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+ .end = NAS100D_LED_PWR_GPIO,
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.flags = IXP4XX_GPIO_LOW,
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},
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{
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.name = "disk", /* yellow led */
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- .start = 3,
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- .end = 3,
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+ .start = NAS100D_LED_DISK_GPIO,
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+ .end = NAS100D_LED_DISK_GPIO,
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.flags = IXP4XX_GPIO_LOW,
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},
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};
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diff --git a/include/asm-arm/arch-ixp4xx/nas100d.h b/include/asm-arm/arch-ixp4xx/nas100d.h
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index 131e0a1..98d9378 100644
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--- a/include/asm-arm/arch-ixp4xx/nas100d.h
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+++ b/include/asm-arm/arch-ixp4xx/nas100d.h
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@@ -38,15 +38,15 @@
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/* Buttons */
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-#define NAS100D_PB_GPIO 14
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-#define NAS100D_RB_GPIO 4
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+#define NAS100D_PB_GPIO 14 /* power button */
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+#define NAS100D_RB_GPIO 4 /* reset button */
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+
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+/* Power control */
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+
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#define NAS100D_PO_GPIO 12 /* power off */
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-#define NAS100D_PB_IRQ IRQ_IXP4XX_GPIO14
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-#define NAS100D_RB_IRQ IRQ_IXP4XX_GPIO4
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+/* LEDs */
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-/*
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-#define NAS100D_PB_BM (1L << NAS100D_PB_GPIO)
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-#define NAS100D_PO_BM (1L << NAS100D_PO_GPIO)
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-#define NAS100D_RB_BM (1L << NAS100D_RB_GPIO)
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-*/
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+#define NAS100D_LED_WLAN_GPIO 0
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+#define NAS100D_LED_DISK_GPIO 3
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+#define NAS100D_LED_PWR_GPIO 15
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--
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1.5.2.5
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