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| author | Aurelien Jarno <aurelien@aurel32.net> | 2008-10-14 11:44:43 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2008-10-15 12:46:51 +0100 |
| commit | 89f8c04a49019eeb3998f9f0990256aec146fe9d (patch) | |
| tree | 9c998c69575b01007f1463d1ba20295e36723adf /arch | |
| parent | b06f3e19a673e44ff56ce265600c5c6eb99aa914 (diff) | |
| download | kernel_samsung_smdk4412-89f8c04a49019eeb3998f9f0990256aec146fe9d.zip kernel_samsung_smdk4412-89f8c04a49019eeb3998f9f0990256aec146fe9d.tar.gz kernel_samsung_smdk4412-89f8c04a49019eeb3998f9f0990256aec146fe9d.tar.bz2 | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/bcm47xx/wgt634u.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/mips/bcm47xx/wgt634u.c b/arch/mips/bcm47xx/wgt634u.c index f9e309a..ef00e7f 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 |