1 files changed, 57 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/generic.c b/arch/arm/mach-pxa/generic.c
index 698aeec52961..76970598f550 100644
--- a/arch/arm/mach-pxa/generic.c
+++ b/arch/arm/mach-pxa/generic.c
@@ -23,6 +23,7 @@
 #include <linux/ioport.h>
 #include <linux/pm.h>
 #include <linux/string.h>
+#include <linux/sysdev.h>
 
 #include <asm/hardware.h>
 #include <asm/irq.h>
@@ -226,3 +227,59 @@ void __init pxa_map_io(void)
         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
         get_clk_frequency_khz(1);
 }
+
+#ifdef CONFIG_PM
+
+static unsigned long saved_gplr[4];
+static unsigned long saved_gpdr[4];
+static unsigned long saved_grer[4];
+static unsigned long saved_gfer[4];
+
+static int pxa_gpio_suspend(struct sys_device *dev, pm_message_t state)
+{
+        int i, gpio;
+
+        for (gpio = 0, i = 0; gpio < pxa_last_gpio; gpio += 32, i++) {
+                saved_gplr[i] = GPLR(gpio);
+                saved_gpdr[i] = GPDR(gpio);
+                saved_grer[i] = GRER(gpio);
+                saved_gfer[i] = GFER(gpio);
+
+                /* Clear GPIO transition detect bits */
+                GEDR(gpio) = GEDR(gpio);
+        }
+        return 0;
+}
+
+static int pxa_gpio_resume(struct sys_device *dev)
+{
+        int i, gpio;
+
+        for (gpio = 0, i = 0; gpio < pxa_last_gpio; gpio += 32, i++) {
+                /* restore level with set/clear */
+                GPSR(gpio) = saved_gplr[i];
+                GPCR(gpio) = ~saved_gplr[i];
+
+                GRER(gpio) = saved_grer[i];
+                GFER(gpio) = saved_gfer[i];
+                GPDR(gpio) = saved_gpdr[i];
+        }
+        return 0;
+}
+#else
+#define pxa_gpio_suspend        NULL
+#define pxa_gpio_resume         NULL
+#endif
+
+struct sysdev_class pxa_gpio_sysclass = {
+        .name           = "gpio",
+        .suspend        = pxa_gpio_suspend,
+        .resume         = pxa_gpio_resume,
+};
+
+static int __init pxa_gpio_init(void)
+{
+        return sysdev_class_register(&pxa_gpio_sysclass);
+}
+
+core_initcall(pxa_gpio_init);