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authorPatrick Mochel <patrick.mochel@intel.com>2006-05-10 10:33:00 -0400
committerLen Brown <len.brown@intel.com>2006-05-15 02:44:47 -0400
commit5b3272655a8e8a9a6e2503bc5a88fc9d9c8292a4 (patch)
treea292396e87e1bdafdca199ab1c1843302ccf00f6 /drivers/acpi/scan.c
parentd8c3291c73b958243b33f8509d4507e76dafd055 (diff)
ACPI: create acpi_device_suspend()/acpi_device_resume()
updated and tested by Konstantin Karasyov http://bugzilla.kernel.org/show_bug.cgi?id=5000 Signed-off-by: Patrick Mochel <patrick.mochel@intel.com> Signed-off-by: Konstantin Karasyov <konstantin.karasyov @intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/scan.c')
-rw-r--r--drivers/acpi/scan.c118
1 files changed, 118 insertions, 0 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index a0ab828b2cc5..19ae9ff10210 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1371,6 +1371,108 @@ static int acpi_bus_scan_fixed(struct acpi_device *root)
return_VALUE(result);
}
+
+static struct acpi_device * to_acpi_dev(struct device * dev)
+{
+ return container_of(dev, struct acpi_device, dev);
+}
+
+
+static int root_suspend(struct acpi_device * acpi_dev)
+{
+ struct acpi_device * dev, * next;
+ int result;
+
+ spin_lock(&acpi_device_lock);
+ list_for_each_entry_safe_reverse(dev, next, &acpi_device_list, g_list) {
+ if (dev->driver && dev->driver->ops.suspend) {
+ spin_unlock(&acpi_device_lock);
+
+ /* TBD: What suspend state should be passed
+ * to device?
+ */
+ result = dev->driver->ops.suspend(dev, 0);
+ if (result) {
+ printk(KERN_ERR PREFIX "[%s - %s] Suspend failed: %d\n",
+ acpi_device_name(dev),
+ acpi_device_bid(dev), result);
+ }
+ spin_lock(&acpi_device_lock);
+ }
+ }
+ spin_unlock(&acpi_device_lock);
+ return 0;
+}
+
+
+static int acpi_device_suspend(struct device * dev, pm_message_t state)
+{
+ struct acpi_device * acpi_dev = to_acpi_dev(dev);
+
+ /*
+ * For now, we should only register 1 generic device -
+ * the ACPI root device - and from there, we walk the
+ * tree of ACPI devices to suspend each one using the
+ * ACPI driver methods.
+ */
+ if (acpi_dev->handle == ACPI_ROOT_OBJECT)
+ root_suspend(acpi_dev);
+ return 0;
+}
+
+
+
+static int root_resume(struct acpi_device * acpi_dev)
+{
+ struct acpi_device * dev, * next;
+ int result;
+
+ spin_lock(&acpi_device_lock);
+ list_for_each_entry_safe(dev, next, &acpi_device_list, g_list) {
+ if (dev->driver && dev->driver->ops.resume) {
+ spin_unlock(&acpi_device_lock);
+
+ /* TBD: What suspend state should be passed
+ * to device?
+ */
+ result = dev->driver->ops.resume(dev, 0);
+ if (result) {
+ printk(KERN_ERR PREFIX "[%s - %s] resume failed: %d\n",
+ acpi_device_name(dev),
+ acpi_device_bid(dev), result);
+ }
+ spin_lock(&acpi_device_lock);
+ }
+ }
+ spin_unlock(&acpi_device_lock);
+ return 0;
+}
+
+
+static int acpi_device_resume(struct device * dev)
+{
+ struct acpi_device * acpi_dev = to_acpi_dev(dev);
+
+ /*
+ * For now, we should only register 1 generic device -
+ * the ACPI root device - and from there, we walk the
+ * tree of ACPI devices to resume each one using the
+ * ACPI driver methods.
+ */
+ if (acpi_dev->handle == ACPI_ROOT_OBJECT)
+ root_resume(acpi_dev);
+ return 0;
+}
+
+
+struct bus_type acpi_bus_type = {
+ .name = "acpi",
+ .suspend = acpi_device_suspend,
+ .resume = acpi_device_resume,
+};
+
+
+
static int __init acpi_scan_init(void)
{
int result;
@@ -1383,6 +1485,12 @@ static int __init acpi_scan_init(void)
kset_register(&acpi_namespace_kset);
+ result = bus_register(&acpi_bus_type);
+ if (result) {
+ /* We don't want to quit even if we failed to add suspend/resume */
+ printk(KERN_ERR PREFIX "Could not register bus type\n");
+ }
+
/*
* Create the root device in the bus's device tree
*/
@@ -1392,6 +1500,16 @@ static int __init acpi_scan_init(void)
goto Done;
result = acpi_start_single_object(acpi_root);
+ if (result)
+ goto Done;
+
+ acpi_root->dev.bus = &acpi_bus_type;
+ snprintf(acpi_root->dev.bus_id, BUS_ID_SIZE, "%s", acpi_bus_type.name);
+ result = device_register(&acpi_root->dev);
+ if (result) {
+ /* We don't want to quit even if we failed to add suspend/resume */
+ printk(KERN_ERR PREFIX "Could not register device\n");
+ }
/*
* Enumerate devices in the ACPI namespace.