MIPS: WGT634U: Add reset button support

This patch adds support for the reset button of WGT634U machine, using
GPIO interrupts. Based on a patch from Michel Lespinasse.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/arch/mips/bcm47xx/wgt634u.c b/arch/mips/bcm47xx/wgt634u.c
index f9e309a96576..ef00e7f58c24 100644
--- a/arch/mips/bcm47xx/wgt634u.c
+++ b/arch/mips/bcm47xx/wgt634u.c
@@ -11,6 +11,9 @@
 #include <linux/leds.h>
 #include <linux/mtd/physmap.h>
 #include <linux/ssb/ssb.h>
+#include <linux/interrupt.h>
+#include <linux/reboot.h>
+#include <linux/gpio.h>
 #include <asm/mach-bcm47xx/bcm47xx.h>
 
 /* GPIO definitions for the WGT634U */
@@ -99,6 +102,30 @@ static struct platform_device *wgt634u_devices[] __initdata = {
         &wgt634u_gpio_leds,
 };
 
+static irqreturn_t gpio_interrupt(int irq, void *ignored)
+{
+        int state;
+
+        /* Interrupts are shared, check if the current one is
+           a GPIO interrupt. */
+        if (!ssb_chipco_irq_status(&ssb_bcm47xx.chipco,
+                                   SSB_CHIPCO_IRQ_GPIO))
+                return IRQ_NONE;
+
+        state = gpio_get_value(WGT634U_GPIO_RESET);
+
+        /* Interrupt are level triggered, revert the interrupt polarity
+           to clear the interrupt. */
+        gpio_polarity(WGT634U_GPIO_RESET, state);
+
+        if (!state) {
+                printk(KERN_INFO "Reset button pressed");
+                ctrl_alt_del();
+        }
+
+        return IRQ_HANDLED;
+}
+
 static int __init wgt634u_init(void)
 {
         /* There is no easy way to detect that we are running on a WGT634U
@@ -115,6 +142,16 @@ static int __init wgt634u_init(void)
 
                 printk(KERN_INFO "WGT634U machine detected.\n");
 
+                if (!request_irq(gpio_to_irq(WGT634U_GPIO_RESET),
+                                 gpio_interrupt, IRQF_SHARED,
+                                 "WGT634U GPIO", &ssb_bcm47xx.chipco)) {
+                        gpio_direction_input(WGT634U_GPIO_RESET);
+                        gpio_intmask(WGT634U_GPIO_RESET, 1);
+                        ssb_chipco_irq_mask(&ssb_bcm47xx.chipco,
+                                            SSB_CHIPCO_IRQ_GPIO,
+                                            SSB_CHIPCO_IRQ_GPIO);
+                }
+
                 wgt634u_flash_data.width = mcore->flash_buswidth;
                 wgt634u_flash_resource.start = mcore->flash_window;
                 wgt634u_flash_resource.end = mcore->flash_window