[ARM] 4769/2: ixp4xx: Button updates for the dsmg600 board

 * Remove the superfluous declaration of ctrl_alt_del().
 * Convert GPIO and IRQ handling to use the <asm/gpio.h> api.
 * Perform the reset on the release of the power button, so that
   NAS devices which have been set to auto-power-on (by solder
   bridging the power button) do not continuously power cycle.
 * Remove all superflous constants from dsmg600.h

Signed-off-by: Rod Whitby <rod@whitby.id.au>
Acked-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 17 insertions, 13 deletions

diff --git a/arch/arm/mach-ixp4xx/dsmg600-power.c b/arch/arm/mach-ixp4xx/dsmg600-power.c
index 34717872d076..db6398777124 100644
--- a/arch/arm/mach-ixp4xx/dsmg600-power.c
+++ b/arch/arm/mach-ixp4xx/dsmg600-power.c
@@ -26,14 +26,13 @@
 #include <linux/jiffies.h>
 #include <linux/timer.h>
 
+#include <asm/gpio.h>
 #include <asm/mach-types.h>
 
-extern void ctrl_alt_del(void);
-
 /* 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 volatile int power_button_countdown;
+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 */
@@ -47,22 +46,27 @@ static void dsmg600_power_handler(unsigned long data)
          * state of the power button.
          */
 
-        if (*IXP4XX_GPIO_GPINR & DSMG600_PB_BM) {
+        if (gpio_get_value(DSMG600_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.
+                        /* 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(DSMG600_LED_PWR_GPIO, IXP4XX_GPIO_LOW);
+                } else {
+                        power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
                 }
-                power_button_countdown--;
-
-        } else {
-                power_button_countdown = PBUTTON_HOLDDOWN_COUNT;
         }
 
         mod_timer(&dsmg600_power_timer, jiffies + msecs_to_jiffies(500));
@@ -81,12 +85,12 @@ static int __init dsmg600_power_init(void)
         if (!(machine_is_dsmg600()))
                 return 0;
 
-        if (request_irq(DSMG600_RB_IRQ, &dsmg600_reset_handler,
+        if (request_irq(gpio_to_irq(DSMG600_RB_GPIO), &dsmg600_reset_handler,
                 IRQF_DISABLED | IRQF_TRIGGER_LOW, "DSM-G600 reset button",
                 NULL) < 0) {
 
                 printk(KERN_DEBUG "Reset Button IRQ %d not available\n",
-                        DSMG600_RB_IRQ);
+                        gpio_to_irq(DSMG600_RB_GPIO));
 
                 return -EIO;
         }
@@ -114,7 +118,7 @@ static void __exit dsmg600_power_exit(void)
 
         del_timer_sync(&dsmg600_power_timer);
 
-        free_irq(DSMG600_RB_IRQ, NULL);
+        free_irq(gpio_to_irq(DSMG600_RB_GPIO), NULL);
 }
 
 module_init(dsmg600_power_init);