[PATCH] acpiphp: add dock event handling

These patches add generic dock event handling to acpiphp.  If there are
pci devices that need to be inserted/removed after the dock event, the
event notification will be handed down to the normal pci hotplug event
handler in acpiphp so that new bridges/devices can be enumerated.

Because some dock stations do not have pci bridges or pci devices that
need to be inserted after a dock, acpiphp will remain loaded to handle
dock events even if no hotpluggable pci slots are discovered.

You probably need to have the pci=assign-busses kernel parameter enabled
to use these patches, and you may not allow ibm_acpi to handle docking
notifications and use this patch.

This patch incorporates feedback provided by many.

Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/pci/hotplug/Makefile

@@ -37,7 +37,8 @@ ibmphp-objs		:=	ibmphp_core.o	\
 				ibmphp_hpc.o
 
 acpiphp-objs		:=	acpiphp_core.o	\
-				acpiphp_glue.o
+				acpiphp_glue.o  \
+				acpiphp_dock.o
 
 rpaphp-objs		:=	rpaphp_core.o	\
 				rpaphp_pci.o	\

drivers/pci/hotplug/acpiphp.h

@@ -161,6 +161,25 @@ struct acpiphp_attention_info
 	struct module *owner;
 };
 
+
+struct dependent_device {
+	struct list_head device_list;
+	struct list_head pci_list;
+	acpi_handle handle;
+	struct acpiphp_func *func;
+};
+
+
+struct acpiphp_dock_station {
+	acpi_handle handle;
+	u32 last_dock_time;
+	u32 flags;
+	struct acpiphp_func *dock_bridge;
+	struct list_head dependent_devices;
+	struct list_head pci_dependent_devices;
+};
+
+
 /* PCI bus bridge HID */
 #define ACPI_PCI_HOST_HID		"PNP0A03"
 
@@ -198,6 +217,12 @@ struct acpiphp_attention_info
 #define FUNC_HAS_PS1		(0x00000020)
 #define FUNC_HAS_PS2		(0x00000040)
 #define FUNC_HAS_PS3		(0x00000080)
+#define FUNC_HAS_DCK            (0x00000100)
+#define FUNC_IS_DD              (0x00000200)
+
+/* dock station flags */
+#define DOCK_DOCKING            (0x00000001)
+#define DOCK_HAS_BRIDGE         (0x00000002)
 
 /* function prototypes */
 
@@ -211,6 +236,7 @@ extern void acpiphp_glue_exit (void);
 extern int acpiphp_get_num_slots (void);
 extern struct acpiphp_slot *get_slot_from_id (int id);
 typedef int (*acpiphp_callback)(struct acpiphp_slot *slot, void *data);
+void handle_hotplug_event_func(acpi_handle, u32, void*);
 
 extern int acpiphp_enable_slot (struct acpiphp_slot *slot);
 extern int acpiphp_disable_slot (struct acpiphp_slot *slot);
@@ -220,6 +246,16 @@ extern u8 acpiphp_get_latch_status (struct acpiphp_slot *slot);
 extern u8 acpiphp_get_adapter_status (struct acpiphp_slot *slot);
 extern u32 acpiphp_get_address (struct acpiphp_slot *slot);
 
+/* acpiphp_dock.c */
+extern int find_dock_station(void);
+extern void remove_dock_station(void);
+extern void add_dependent_device(struct dependent_device *new_dd);
+extern void add_pci_dependent_device(struct dependent_device *new_dd);
+extern struct dependent_device *get_dependent_device(acpi_handle handle);
+extern int is_dependent_device(acpi_handle handle);
+extern int detect_dependent_devices(acpi_handle *bridge_handle);
+extern struct dependent_device *alloc_dependent_device(acpi_handle handle);
+
 /* variables */
 extern int acpiphp_debug;
 

drivers/pci/hotplug/acpiphp_core.c

@@ -429,14 +429,17 @@ static void __exit cleanup_slots (void)
 static int __init acpiphp_init(void)
 {
 	int retval;
+	int docking_station;
 
 	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
 
 	acpiphp_debug = debug;
 
+	docking_station = find_dock_station();
+
 	/* read all the ACPI info from the system */
 	retval = init_acpi();
-	if (retval)
+	if (retval && !(docking_station))
 		return retval;
 
 	return init_slots();
@@ -448,6 +451,8 @@ static void __exit acpiphp_exit(void)
 	cleanup_slots();
 	/* deallocate internal data structures etc. */
 	acpiphp_glue_exit();
+
+	remove_dock_station();
 }
 
 module_init(acpiphp_init);