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MIPS: WGT634U: Add reset button support

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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>
This commit is contained in:
Aurelien Jarno 2008-10-14 11:44:43 +02:00 committed by Ralf Baechle
parent b06f3e19a6
commit 89f8c04a49
1 changed files with 37 additions and 0 deletions
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37
arch/mips/bcm47xx/wgt634u.c
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@ -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