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