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Commit 89f8c04a authored by Aurelien Jarno's avatar Aurelien Jarno Committed by Ralf Baechle
Browse files

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: default avatarAurelien Jarno <aurelien@aurel32.net>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent b06f3e19

arch/mips/bcm47xx/wgt634u.c

+37 −0
Original line number Diff line number Diff line
@@ -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