" the driver to wait for userspace to write the undock sysfs file "
" before undocking");
-static struct atomic_notifier_head dock_notifier_list;
-
static const struct acpi_device_id dock_device_ids[] = {
{"LNXDOCK", 0},
{"", 0},
#define DOCK_EVENT 3
#define UNDOCK_EVENT 2
+enum dock_callback_type {
+ DOCK_CALL_HANDLER,
+ DOCK_CALL_FIXUP,
+ DOCK_CALL_UEVENT,
+};
+
/*****************************************************************************
* Dock Dependent device functions *
*****************************************************************************/
return 0;
}
+static void remove_dock_dependent_devices(struct dock_station *ds)
+{
+ struct dock_dependent_device *dd, *aux;
+
+ list_for_each_entry_safe(dd, aux, &ds->dependent_devices, list) {
+ list_del(&dd->list);
+ kfree(dd);
+ }
+}
+
/**
* dock_init_hotplug - Initialize a hotplug device on a docking station.
* @dd: Dock-dependent device.
int ret = 0;
mutex_lock(&hotplug_lock);
-
- if (dd->hp_context) {
+ if (WARN_ON(dd->hp_context)) {
ret = -EEXIST;
} else {
dd->hp_refcount = 1;
dd->hp_ops = ops;
dd->hp_context = context;
dd->hp_release = release;
+ if (init)
+ init(context);
}
-
- if (!WARN_ON(ret) && init)
- init(context);
-
mutex_unlock(&hotplug_lock);
return ret;
}
*/
static void dock_release_hotplug(struct dock_dependent_device *dd)
{
- void (*release)(void *) = NULL;
- void *context = NULL;
-
mutex_lock(&hotplug_lock);
-
if (dd->hp_context && !--dd->hp_refcount) {
+ void (*release)(void *) = dd->hp_release;
+ void *context = dd->hp_context;
+
dd->hp_ops = NULL;
- context = dd->hp_context;
dd->hp_context = NULL;
- release = dd->hp_release;
dd->hp_release = NULL;
+ if (release)
+ release(context);
}
-
- if (release && context)
- release(context);
-
mutex_unlock(&hotplug_lock);
}
static void dock_hotplug_event(struct dock_dependent_device *dd, u32 event,
- bool uevent)
+ enum dock_callback_type cb_type)
{
acpi_notify_handler cb = NULL;
bool run = false;
if (dd->hp_context) {
run = true;
dd->hp_refcount++;
- if (dd->hp_ops)
- cb = uevent ? dd->hp_ops->uevent : dd->hp_ops->handler;
+ if (dd->hp_ops) {
+ switch (cb_type) {
+ case DOCK_CALL_FIXUP:
+ cb = dd->hp_ops->fixup;
+ break;
+ case DOCK_CALL_UEVENT:
+ cb = dd->hp_ops->uevent;
+ break;
+ default:
+ cb = dd->hp_ops->handler;
+ }
+ }
}
mutex_unlock(&hotplug_lock);
}
/**
- * hotplug_dock_devices - insert or remove devices on the dock station
+ * hot_remove_dock_devices - Remove dock station devices.
+ * @ds: Dock station.
+ */
+static void hot_remove_dock_devices(struct dock_station *ds)
+{
+ struct dock_dependent_device *dd;
+
+ /*
+ * Walk the list in reverse order so that devices that have been added
+ * last are removed first (in case there are some indirect dependencies
+ * between them).
+ */
+ list_for_each_entry_reverse(dd, &ds->dependent_devices, list)
+ dock_hotplug_event(dd, ACPI_NOTIFY_EJECT_REQUEST, false);
+
+ list_for_each_entry_reverse(dd, &ds->dependent_devices, list)
+ dock_remove_acpi_device(dd->handle);
+}
+
+/**
+ * hotplug_dock_devices - Insert devices on a dock station.
* @ds: the dock station
- * @event: either bus check or eject request
+ * @event: either bus check or device check request
*
* Some devices on the dock station need to have drivers called
* to perform hotplug operations after a dock event has occurred.
{
struct dock_dependent_device *dd;
- /*
- * First call driver specific hotplug functions
- */
+ /* Call driver specific post-dock fixups. */
+ list_for_each_entry(dd, &ds->dependent_devices, list)
+ dock_hotplug_event(dd, event, DOCK_CALL_FIXUP);
+
+ /* Call driver specific hotplug functions. */
list_for_each_entry(dd, &ds->dependent_devices, list)
- dock_hotplug_event(dd, event, false);
+ dock_hotplug_event(dd, event, DOCK_CALL_HANDLER);
/*
- * Now make sure that an acpi_device is created for each
- * dependent device, or removed if this is an eject request.
- * This will cause acpi_drivers to be stopped/started if they
- * exist
+ * Now make sure that an acpi_device is created for each dependent
+ * device. That will cause scan handlers to be attached to device
+ * objects or acpi_drivers to be stopped/started if they are present.
*/
- list_for_each_entry(dd, &ds->dependent_devices, list) {
- if (event == ACPI_NOTIFY_EJECT_REQUEST)
- dock_remove_acpi_device(dd->handle);
- else
- dock_create_acpi_device(dd->handle);
- }
+ list_for_each_entry(dd, &ds->dependent_devices, list)
+ dock_create_acpi_device(dd->handle);
}
static void dock_event(struct dock_station *ds, u32 event, int num)
kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
list_for_each_entry(dd, &ds->dependent_devices, list)
- dock_hotplug_event(dd, event, true);
+ dock_hotplug_event(dd, event, DOCK_CALL_UEVENT);
if (num != DOCK_EVENT)
kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
return 0;
}
-/**
- * register_dock_notifier - add yourself to the dock notifier list
- * @nb: the callers notifier block
- *
- * If a driver wishes to be notified about dock events, they can
- * use this function to put a notifier block on the dock notifier list.
- * this notifier call chain will be called after a dock event, but
- * before hotplugging any new devices.
- */
-int register_dock_notifier(struct notifier_block *nb)
-{
- if (!dock_station_count)
- return -ENODEV;
-
- return atomic_notifier_chain_register(&dock_notifier_list, nb);
-}
-EXPORT_SYMBOL_GPL(register_dock_notifier);
-
-/**
- * unregister_dock_notifier - remove yourself from the dock notifier list
- * @nb: the callers notifier block
- */
-void unregister_dock_notifier(struct notifier_block *nb)
-{
- if (!dock_station_count)
- return;
-
- atomic_notifier_chain_unregister(&dock_notifier_list, nb);
-}
-EXPORT_SYMBOL_GPL(unregister_dock_notifier);
-
/**
* register_hotplug_dock_device - register a hotplug function
* @handle: the handle of the device
*/
dock_event(ds, event, UNDOCK_EVENT);
- hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST);
+ hot_remove_dock_devices(ds);
undock(ds);
acpi_evaluate_lck(ds->handle, 0);
acpi_evaluate_ej0(ds->handle);
/**
* dock_notify - act upon an acpi dock notification
- * @handle: the dock station handle
+ * @ds: dock station
* @event: the acpi event
- * @data: our driver data struct
*
* If we are notified to dock, then check to see if the dock is
* present and then dock. Notify all drivers of the dock event,
* and then hotplug and devices that may need hotplugging.
*/
-static void dock_notify(acpi_handle handle, u32 event, void *data)
+static void dock_notify(struct dock_station *ds, u32 event)
{
- struct dock_station *ds = data;
- struct acpi_device *tmp;
+ acpi_handle handle = ds->handle;
+ struct acpi_device *ad;
int surprise_removal = 0;
/*
switch (event) {
case ACPI_NOTIFY_BUS_CHECK:
case ACPI_NOTIFY_DEVICE_CHECK:
- if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle,
- &tmp)) {
+ if (!dock_in_progress(ds) && acpi_bus_get_device(handle, &ad)) {
begin_dock(ds);
dock(ds);
if (!dock_present(ds)) {
complete_dock(ds);
break;
}
- atomic_notifier_call_chain(&dock_notifier_list,
- event, NULL);
hotplug_dock_devices(ds, event);
complete_dock(ds);
dock_event(ds, event, DOCK_EVENT);
}
struct dock_data {
- acpi_handle handle;
- unsigned long event;
struct dock_station *ds;
+ u32 event;
};
static void acpi_dock_deferred_cb(void *context)
struct dock_data *data = context;
acpi_scan_lock_acquire();
- dock_notify(data->handle, data->event, data->ds);
+ dock_notify(data->ds, data->event);
acpi_scan_lock_release();
kfree(data);
}
-static int acpi_dock_notifier_call(struct notifier_block *this,
- unsigned long event, void *data)
+static void dock_notify_handler(acpi_handle handle, u32 event, void *data)
{
- struct dock_station *dock_station;
- acpi_handle handle = data;
+ struct dock_data *dd;
if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK
&& event != ACPI_NOTIFY_EJECT_REQUEST)
- return 0;
-
- acpi_scan_lock_acquire();
-
- list_for_each_entry(dock_station, &dock_stations, sibling) {
- if (dock_station->handle == handle) {
- struct dock_data *dd;
- acpi_status status;
-
- dd = kmalloc(sizeof(*dd), GFP_KERNEL);
- if (!dd)
- break;
+ return;
- dd->handle = handle;
- dd->event = event;
- dd->ds = dock_station;
- status = acpi_os_hotplug_execute(acpi_dock_deferred_cb,
- dd);
- if (ACPI_FAILURE(status))
- kfree(dd);
+ dd = kmalloc(sizeof(*dd), GFP_KERNEL);
+ if (dd) {
+ acpi_status status;
- break;
- }
+ dd->ds = data;
+ dd->event = event;
+ status = acpi_os_hotplug_execute(acpi_dock_deferred_cb, dd);
+ if (ACPI_FAILURE(status))
+ kfree(dd);
}
-
- acpi_scan_lock_release();
- return 0;
}
-static struct notifier_block dock_acpi_notifier = {
- .notifier_call = acpi_dock_notifier_call,
-};
-
/**
* find_dock_devices - find devices on the dock station
* @handle: the handle of the device we are examining
*/
static int __init dock_add(acpi_handle handle)
{
- int ret, id;
- struct dock_station ds, *dock_station;
+ struct dock_station *dock_station, ds = { NULL, };
struct platform_device *dd;
+ acpi_status status;
+ int ret;
- id = dock_station_count;
- memset(&ds, 0, sizeof(ds));
- dd = platform_device_register_data(NULL, "dock", id, &ds, sizeof(ds));
+ dd = platform_device_register_data(NULL, "dock", dock_station_count,
+ &ds, sizeof(ds));
if (IS_ERR(dd))
return PTR_ERR(dd);
if (ret)
goto err_rmgroup;
+ status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+ dock_notify_handler, dock_station);
+ if (ACPI_FAILURE(status)) {
+ ret = -ENODEV;
+ goto err_rmgroup;
+ }
+
dock_station_count++;
list_add(&dock_station->sibling, &dock_stations);
return 0;
err_rmgroup:
+ remove_dock_dependent_devices(dock_station);
sysfs_remove_group(&dd->dev.kobj, &dock_attribute_group);
err_unregister:
platform_device_unregister(dd);
*
* This is called by acpi_walk_namespace to look for dock stations and bays.
*/
-static __init acpi_status
+static acpi_status __init
find_dock_and_bay(acpi_handle handle, u32 lvl, void *context, void **rv)
{
if (acpi_dock_match(handle) || is_ejectable_bay(handle))
return;
}
- ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list);
- register_acpi_bus_notifier(&dock_acpi_notifier);
pr_info(PREFIX "%s: %d docks/bays found\n",
ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count);
}
projects / firefly-linux-kernel-4.4.55.git / blobdiff