PCI/PM: add PCIe runtime D3cold support

[cascardo/linux.git] / drivers / pci / pci-sysfs.c

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 86c63fe..1426db0 100644 (file)
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -28,6 +28,7 @@
 #include <linux/pci-aspm.h>
 #include <linux/slab.h>
 #include <linux/vgaarb.h>
+#include <linux/pm_runtime.h>
 #include "pci.h"
 
 static int sysfs_initialized;  /* = 0 */
@@ -378,6 +379,31 @@ dev_bus_rescan_store(struct device *dev, struct device_attribute *attr,
 
 #endif
 
+#if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
+static ssize_t d3cold_allowed_store(struct device *dev,
+                                   struct device_attribute *attr,
+                                   const char *buf, size_t count)
+{
+       struct pci_dev *pdev = to_pci_dev(dev);
+       unsigned long val;
+
+       if (strict_strtoul(buf, 0, &val) < 0)
+               return -EINVAL;
+
+       pdev->d3cold_allowed = !!val;
+       pm_runtime_resume(dev);
+
+       return count;
+}
+
+static ssize_t d3cold_allowed_show(struct device *dev,
+                                  struct device_attribute *attr, char *buf)
+{
+       struct pci_dev *pdev = to_pci_dev(dev);
+       return sprintf (buf, "%u\n", pdev->d3cold_allowed);
+}
+#endif
+
 struct device_attribute pci_dev_attrs[] = {
        __ATTR_RO(resource),
        __ATTR_RO(vendor),
@@ -401,6 +427,9 @@ struct device_attribute pci_dev_attrs[] = {
 #ifdef CONFIG_HOTPLUG
        __ATTR(remove, (S_IWUSR|S_IWGRP), NULL, remove_store),
        __ATTR(rescan, (S_IWUSR|S_IWGRP), NULL, dev_rescan_store),
+#endif
+#if defined(CONFIG_PM_RUNTIME) && defined(CONFIG_ACPI)
+       __ATTR(d3cold_allowed, 0644, d3cold_allowed_show, d3cold_allowed_store),
 #endif
        __ATTR_NULL,
 };