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authorAurelien Jarno <aurelien@aurel32.net>2008-10-14 11:44:43 +0200
committerRalf Baechle <ralf@linux-mips.org>2008-10-15 12:46:51 +0100
commit89f8c04a49019eeb3998f9f0990256aec146fe9d (patch)
tree9c998c69575b01007f1463d1ba20295e36723adf
parentb06f3e19a673e44ff56ce265600c5c6eb99aa914 (diff)
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>
-rw-r--r--arch/mips/bcm47xx/wgt634u.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/mips/bcm47xx/wgt634u.c b/arch/mips/bcm47xx/wgt634u.c
index f9e309a9657..ef00e7f58c2 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