/* * dock.c - ACPI dock station driver * * Copyright (C) 2006 Kristen Carlson Accardi <kristen.c.accardi@intel.com> * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/types.h> #include <linux/notifier.h> #include <linux/platform_device.h> #include <linux/jiffies.h> #include <linux/stddef.h> #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> #define PREFIX "ACPI: " #define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver" ACPI_MODULE_NAME("dock"); MODULE_AUTHOR("Kristen Carlson Accardi"); MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION); MODULE_LICENSE("GPL"); static int immediate_undock = 1; module_param(immediate_undock, bool, 0644); MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to " "undock immediately when the undock button is pressed, 0 will cause" " 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}, }; MODULE_DEVICE_TABLE(acpi, dock_device_ids); struct dock_station { acpi_handle handle; unsigned long last_dock_time; u32 flags; spinlock_t dd_lock; struct mutex hp_lock; struct list_head dependent_devices; struct list_head hotplug_devices; struct list_head sibling; struct platform_device *dock_device; }; static LIST_HEAD(dock_stations); static int dock_station_count; struct dock_dependent_device { struct list_head list; struct list_head hotplug_list; acpi_handle handle; struct acpi_dock_ops *ops; void *context; }; #define DOCK_DOCKING 0x00000001 #define DOCK_UNDOCKING 0x00000002 #define DOCK_IS_DOCK 0x00000010 #define DOCK_IS_ATA 0x00000020 #define DOCK_IS_BAT 0x00000040 #define DOCK_EVENT 3 #define UNDOCK_EVENT 2 /***************************************************************************** * Dock Dependent device functions * *****************************************************************************/ /** * add_dock_dependent_device - associate a device with the dock station * @ds: The dock station * @handle: handle of the dependent device * * Add the dependent device to the dock's dependent device list. */ static int add_dock_dependent_device(struct dock_station *ds, acpi_handle handle) { struct dock_dependent_device *dd; dd = kzalloc(sizeof(*dd), GFP_KERNEL); if (!dd) return -ENOMEM; dd->handle = handle; INIT_LIST_HEAD(&dd->list); INIT_LIST_HEAD(&dd->hotplug_list); spin_lock(&ds->dd_lock); list_add_tail(&dd->list, &ds->dependent_devices); spin_unlock(&ds->dd_lock); return 0; } /** * dock_add_hotplug_device - associate a hotplug handler with the dock station * @ds: The dock station * @dd: The dependent device struct * * Add the dependent device to the dock's hotplug device list */ static void dock_add_hotplug_device(struct dock_station *ds, struct dock_dependent_device *dd) { mutex_lock(&ds->hp_lock); list_add_tail(&dd->hotplug_list, &ds->hotplug_devices); mutex_unlock(&ds->hp_lock); } /** * dock_del_hotplug_device - remove a hotplug handler from the dock station * @ds: The dock station * @dd: the dependent device struct * * Delete the dependent device from the dock's hotplug device list */ static void dock_del_hotplug_device(struct dock_station *ds, struct dock_dependent_device *dd) { mutex_lock(&ds->hp_lock); list_del(&dd->hotplug_list); mutex_unlock(&ds->hp_lock); } /** * find_dock_dependent_device - get a device dependent on this dock * @ds: the dock station * @handle: the acpi_handle of the device we want * * iterate over the dependent device list for this dock. If the * dependent device matches the handle, return. */ static struct dock_dependent_device * find_dock_dependent_device(struct dock_station *ds, acpi_handle handle) { struct dock_dependent_device *dd; spin_lock(&ds->dd_lock); list_for_each_entry(dd, &ds->dependent_devices, list) { if (handle == dd->handle) { spin_unlock(&ds->dd_lock); return dd; } } spin_unlock(&ds->dd_lock); return NULL; } /***************************************************************************** * Dock functions * *****************************************************************************/ /** * is_dock - see if a device is a dock station * @handle: acpi handle of the device * * If an acpi object has a _DCK method, then it is by definition a dock * station, so return true. */ static int is_dock(acpi_handle handle) { acpi_status status; acpi_handle tmp; status = acpi_get_handle(handle, "_DCK", &tmp); if (ACPI_FAILURE(status)) return 0; return 1; } static int is_ejectable(acpi_handle handle) { acpi_status status; acpi_handle tmp; status = acpi_get_handle(handle, "_EJ0", &tmp); if (ACPI_FAILURE(status)) return 0; return 1; } static int is_ata(acpi_handle handle) { acpi_handle tmp; if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) return 1; return 0; } static int is_battery(acpi_handle handle) { struct acpi_device_info *info; int ret = 1; if (!ACPI_SUCCESS(acpi_get_object_info(handle, &info))) return 0; if (!(info->valid & ACPI_VALID_HID)) ret = 0; else ret = !strcmp("PNP0C0A", info->hardware_id.string); kfree(info); return ret; } static int is_ejectable_bay(acpi_handle handle) { acpi_handle phandle; if (!is_ejectable(handle)) return 0; if (is_battery(handle) || is_ata(handle)) return 1; if (!acpi_get_parent(handle, &phandle) && is_ata(phandle)) return 1; return 0; } /** * is_dock_device - see if a device is on a dock station * @handle: acpi handle of the device * * If this device is either the dock station itself, * or is a device dependent on the dock station, then it * is a dock device */ int is_dock_device(acpi_handle handle) { struct dock_station *dock_station; if (!dock_station_count) return 0; if (is_dock(handle)) return 1; list_for_each_entry(dock_station, &dock_stations, sibling) if (find_dock_dependent_device(dock_station, handle)) return 1; return 0; } EXPORT_SYMBOL_GPL(is_dock_device); /** * dock_present - see if the dock station is present. * @ds: the dock station * * execute the _STA method. note that present does not * imply that we are docked. */ static int dock_present(struct dock_station *ds) { unsigned long long sta; acpi_status status; if (ds) { status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta); if (ACPI_SUCCESS(status) && sta) return 1; } return 0; } /** * dock_create_acpi_device - add new devices to acpi * @handle - handle of the device to add * * This function will create a new acpi_device for the given * handle if one does not exist already. This should cause * acpi to scan for drivers for the given devices, and call * matching driver's add routine. * * Returns a pointer to the acpi_device corresponding to the handle. */ static struct acpi_device * dock_create_acpi_device(acpi_handle handle) { struct acpi_device *device; struct acpi_device *parent_device; acpi_handle parent; int ret; if (acpi_bus_get_device(handle, &device)) { /* * no device created for this object, * so we should create one. */ acpi_get_parent(handle, &parent); if (acpi_bus_get_device(parent, &parent_device)) parent_device = NULL; ret = acpi_bus_add(&device, parent_device, handle, ACPI_BUS_TYPE_DEVICE); if (ret) { pr_debug("error adding bus, %x\n", -ret); return NULL; } } return device; } /** * dock_remove_acpi_device - remove the acpi_device struct from acpi * @handle - the handle of the device to remove * * Tell acpi to remove the acpi_device. This should cause any loaded * driver to have it's remove routine called. */ static void dock_remove_acpi_device(acpi_handle handle) { struct acpi_device *device; int ret; if (!acpi_bus_get_device(handle, &device)) { ret = acpi_bus_trim(device, 1); if (ret) pr_debug("error removing bus, %x\n", -ret); } } /** * hotplug_dock_devices - insert or remove devices on the dock station * @ds: the dock station * @event: either bus check or eject request * * Some devices on the dock station need to have drivers called * to perform hotplug operations after a dock event has occurred. * Traverse the list of dock devices that have registered a * hotplug handler, and call the handler. */ static void hotplug_dock_devices(struct dock_station *ds, u32 event) { struct dock_dependent_device *dd; mutex_lock(&ds->hp_lock); /* * First call driver specific hotplug functions */ list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) if (dd->ops && dd->ops->handler) dd->ops->handler(dd->handle, event, dd->context); /* * 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 */ 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); } mutex_unlock(&ds->hp_lock); } static void dock_event(struct dock_station *ds, u32 event, int num) { struct device *dev = &ds->dock_device->dev; char event_string[13]; char *envp[] = { event_string, NULL }; struct dock_dependent_device *dd; if (num == UNDOCK_EVENT) sprintf(event_string, "EVENT=undock"); else sprintf(event_string, "EVENT=dock"); /* * Indicate that the status of the dock station has * changed. */ if (num == DOCK_EVENT) kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); list_for_each_entry(dd, &ds->hotplug_devices, hotplug_list) if (dd->ops && dd->ops->uevent) dd->ops->uevent(dd->handle, event, dd->context); if (num != DOCK_EVENT) kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); } /** * eject_dock - respond to a dock eject request * @ds: the dock station * * This is called after _DCK is called, to execute the dock station's * _EJ0 method. */ static void eject_dock(struct dock_station *ds) { struct acpi_object_list arg_list; union acpi_object arg; acpi_status status; acpi_handle tmp; /* all dock devices should have _EJ0, but check anyway */ status = acpi_get_handle(ds->handle, "_EJ0", &tmp); if (ACPI_FAILURE(status)) { pr_debug("No _EJ0 support for dock device\n"); return; } arg_list.count = 1; arg_list.pointer = &arg; arg.type = ACPI_TYPE_INTEGER; arg.integer.value = 1; status = acpi_evaluate_object(ds->handle, "_EJ0", &arg_list, NULL); if (ACPI_FAILURE(status)) pr_debug("Failed to evaluate _EJ0!\n"); } /** * handle_dock - handle a dock event * @ds: the dock station * @dock: to dock, or undock - that is the question * * Execute the _DCK method in response to an acpi event */ static void handle_dock(struct dock_station *ds, int dock) { acpi_status status; struct acpi_object_list arg_list; union acpi_object arg; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL }; acpi_get_name(ds->handle, ACPI_FULL_PATHNAME, &name_buffer); printk(KERN_INFO PREFIX "%s - %s\n", (char *)name_buffer.pointer, dock ? "docking" : "undocking"); /* _DCK method has one argument */ arg_list.count = 1; arg_list.pointer = &arg; arg.type = ACPI_TYPE_INTEGER; arg.integer.value = dock; status = acpi_evaluate_object(ds->handle, "_DCK", &arg_list, &buffer); if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) ACPI_EXCEPTION((AE_INFO, status, "%s - failed to execute" " _DCK\n", (char *)name_buffer.pointer)); kfree(buffer.pointer); kfree(name_buffer.pointer); } static inline void dock(struct dock_station *ds) { handle_dock(ds, 1); } static inline void undock(struct dock_station *ds) { handle_dock(ds, 0); } static inline void begin_dock(struct dock_station *ds) { ds->flags |= DOCK_DOCKING; } static inline void complete_dock(struct dock_station *ds) { ds->flags &= ~(DOCK_DOCKING); ds->last_dock_time = jiffies; } static inline void begin_undock(struct dock_station *ds) { ds->flags |= DOCK_UNDOCKING; } static inline void complete_undock(struct dock_station *ds) { ds->flags &= ~(DOCK_UNDOCKING); } static void dock_lock(struct dock_station *ds, int lock) { struct acpi_object_list arg_list; union acpi_object arg; acpi_status status; arg_list.count = 1; arg_list.pointer = &arg; arg.type = ACPI_TYPE_INTEGER; arg.integer.value = !!lock; status = acpi_evaluate_object(ds->handle, "_LCK", &arg_list, NULL); if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { if (lock) printk(KERN_WARNING PREFIX "Locking device failed\n"); else printk(KERN_WARNING PREFIX "Unlocking device failed\n"); } } /** * dock_in_progress - see if we are in the middle of handling a dock event * @ds: the dock station * * Sometimes while docking, false dock events can be sent to the driver * because good connections aren't made or some other reason. Ignore these * if we are in the middle of doing something. */ static int dock_in_progress(struct dock_station *ds) { if ((ds->flags & DOCK_DOCKING) || time_before(jiffies, (ds->last_dock_time + HZ))) return 1; 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 * @ops: handlers to call after docking * @context: device specific data * * If a driver would like to perform a hotplug operation after a dock * event, they can register an acpi_notifiy_handler to be called by * the dock driver after _DCK is executed. */ int register_hotplug_dock_device(acpi_handle handle, struct acpi_dock_ops *ops, void *context) { struct dock_dependent_device *dd; struct dock_station *dock_station; int ret = -EINVAL; if (!dock_station_count) return -ENODEV; /* * make sure this handle is for a device dependent on the dock, * this would include the dock station itself */ list_for_each_entry(dock_station, &dock_stations, sibling) { /* * An ATA bay can be in a dock and itself can be ejected * separately, so there are two 'dock stations' which need the * ops */ dd = find_dock_dependent_device(dock_station, handle); if (dd) { dd->ops = ops; dd->context = context; dock_add_hotplug_device(dock_station, dd); ret = 0; } } return ret; } EXPORT_SYMBOL_GPL(register_hotplug_dock_device); /** * unregister_hotplug_dock_device - remove yourself from the hotplug list * @handle: the acpi handle of the device */ void unregister_hotplug_dock_device(acpi_handle handle) { struct dock_dependent_device *dd; struct dock_station *dock_station; if (!dock_station_count) return; list_for_each_entry(dock_station, &dock_stations, sibling) { dd = find_dock_dependent_device(dock_station, handle); if (dd) dock_del_hotplug_device(dock_station, dd); } } EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device); /** * handle_eject_request - handle an undock request checking for error conditions * * Check to make sure the dock device is still present, then undock and * hotremove all the devices that may need removing. */ static int handle_eject_request(struct dock_station *ds, u32 event) { if (dock_in_progress(ds)) return -EBUSY; /* * here we need to generate the undock * event prior to actually doing the undock * so that the device struct still exists. * Also, even send the dock event if the * device is not present anymore */ dock_event(ds, event, UNDOCK_EVENT); hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST); undock(ds); dock_lock(ds, 0); eject_dock(ds); if (dock_present(ds)) { printk(KERN_ERR PREFIX "Unable to undock!\n"); return -EBUSY; } complete_undock(ds); return 0; } /** * dock_notify - act upon an acpi dock notification * @handle: the dock station handle * @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) { struct dock_station *ds = data; struct acpi_device *tmp; int surprise_removal = 0; /* * According to acpi spec 3.0a, if a DEVICE_CHECK notification * is sent and _DCK is present, it is assumed to mean an undock * request. */ if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK) event = ACPI_NOTIFY_EJECT_REQUEST; /* * dock station: BUS_CHECK - docked or surprise removal * DEVICE_CHECK - undocked * other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal * * To simplify event handling, dock dependent device handler always * get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and * ACPI_NOTIFY_EJECT_REQUEST for removal */ switch (event) { case ACPI_NOTIFY_BUS_CHECK: case ACPI_NOTIFY_DEVICE_CHECK: if (!dock_in_progress(ds) && acpi_bus_get_device(ds->handle, &tmp)) { begin_dock(ds); dock(ds); if (!dock_present(ds)) { printk(KERN_ERR PREFIX "Unable to dock!\n"); 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); dock_lock(ds, 1); acpi_update_gpes(); break; } if (dock_present(ds) || dock_in_progress(ds)) break; /* This is a surprise removal */ surprise_removal = 1; event = ACPI_NOTIFY_EJECT_REQUEST; /* Fall back */ case ACPI_NOTIFY_EJECT_REQUEST: begin_undock(ds); if ((immediate_undock && !(ds->flags & DOCK_IS_ATA)) || surprise_removal) handle_eject_request(ds, event); else dock_event(ds, event, UNDOCK_EVENT); break; default: printk(KERN_ERR PREFIX "Unknown dock event %d\n", event); } } struct dock_data { acpi_handle handle; unsigned long event; struct dock_station *ds; }; static void acpi_dock_deferred_cb(void *context) { struct dock_data *data = context; dock_notify(data->handle, data->event, data->ds); kfree(data); } static int acpi_dock_notifier_call(struct notifier_block *this, unsigned long event, void *data) { struct dock_station *dock_station; acpi_handle handle = data; if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK && event != ACPI_NOTIFY_EJECT_REQUEST) return 0; list_for_each_entry(dock_station, &dock_stations, sibling) { if (dock_station->handle == handle) { struct dock_data *dd; dd = kmalloc(sizeof(*dd), GFP_KERNEL); if (!dd) return 0; dd->handle = handle; dd->event = event; dd->ds = dock_station; acpi_os_hotplug_execute(acpi_dock_deferred_cb, dd); return 0 ; } } 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 * @lvl: unused * @context: the dock station private data * @rv: unused * * This function is called by acpi_walk_namespace. It will * check to see if an object has an _EJD method. If it does, then it * will see if it is dependent on the dock station. */ static acpi_status find_dock_devices(acpi_handle handle, u32 lvl, void *context, void **rv) { acpi_status status; acpi_handle tmp, parent; struct dock_station *ds = context; status = acpi_bus_get_ejd(handle, &tmp); if (ACPI_FAILURE(status)) { /* try the parent device as well */ status = acpi_get_parent(handle, &parent); if (ACPI_FAILURE(status)) goto fdd_out; /* see if parent is dependent on dock */ status = acpi_bus_get_ejd(parent, &tmp); if (ACPI_FAILURE(status)) goto fdd_out; } if (tmp == ds->handle) add_dock_dependent_device(ds, handle); fdd_out: return AE_OK; } /* * show_docked - read method for "docked" file in sysfs */ static ssize_t show_docked(struct device *dev, struct device_attribute *attr, char *buf) { struct acpi_device *tmp; struct dock_station *dock_station = dev->platform_data; if (ACPI_SUCCESS(acpi_bus_get_device(dock_station->handle, &tmp))) return snprintf(buf, PAGE_SIZE, "1\n"); return snprintf(buf, PAGE_SIZE, "0\n"); } static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL); /* * show_flags - read method for flags file in sysfs */ static ssize_t show_flags(struct device *dev, struct device_attribute *attr, char *buf) { struct dock_station *dock_station = dev->platform_data; return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags); } static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL); /* * write_undock - write method for "undock" file in sysfs */ static ssize_t write_undock(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int ret; struct dock_station *dock_station = dev->platform_data; if (!count) return -EINVAL; begin_undock(dock_station); ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST); return ret ? ret: count; } static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock); /* * show_dock_uid - read method for "uid" file in sysfs */ static ssize_t show_dock_uid(struct device *dev, struct device_attribute *attr, char *buf) { unsigned long long lbuf; struct dock_station *dock_station = dev->platform_data; acpi_status status = acpi_evaluate_integer(dock_station->handle, "_UID", NULL, &lbuf); if (ACPI_FAILURE(status)) return 0; return snprintf(buf, PAGE_SIZE, "%llx\n", lbuf); } static DEVICE_ATTR(uid, S_IRUGO, show_dock_uid, NULL); static ssize_t show_dock_type(struct device *dev, struct device_attribute *attr, char *buf) { struct dock_station *dock_station = dev->platform_data; char *type; if (dock_station->flags & DOCK_IS_DOCK) type = "dock_station"; else if (dock_station->flags & DOCK_IS_ATA) type = "ata_bay"; else if (dock_station->flags & DOCK_IS_BAT) type = "battery_bay"; else type = "unknown"; return snprintf(buf, PAGE_SIZE, "%s\n", type); } static DEVICE_ATTR(type, S_IRUGO, show_dock_type, NULL); static struct attribute *dock_attributes[] = { &dev_attr_docked.attr, &dev_attr_flags.attr, &dev_attr_undock.attr, &dev_attr_uid.attr, &dev_attr_type.attr, NULL }; static struct attribute_group dock_attribute_group = { .attrs = dock_attributes }; /** * dock_add - add a new dock station * @handle: the dock station handle * * allocated and initialize a new dock station device. Find all devices * that are on the dock station, and register for dock event notifications. */ static int __init dock_add(acpi_handle handle) { int ret, id; struct dock_station ds, *dock_station; struct platform_device *dd; id = dock_station_count; memset(&ds, 0, sizeof(ds)); dd = platform_device_register_data(NULL, "dock", id, &ds, sizeof(ds)); if (IS_ERR(dd)) return PTR_ERR(dd); dock_station = dd->dev.platform_data; dock_station->handle = handle; dock_station->dock_device = dd; dock_station->last_dock_time = jiffies - HZ; mutex_init(&dock_station->hp_lock); spin_lock_init(&dock_station->dd_lock); INIT_LIST_HEAD(&dock_station->sibling); INIT_LIST_HEAD(&dock_station->hotplug_devices); ATOMIC_INIT_NOTIFIER_HEAD(&dock_notifier_list); INIT_LIST_HEAD(&dock_station->dependent_devices); /* we want the dock device to send uevents */ dev_set_uevent_suppress(&dd->dev, 0); if (is_dock(handle)) dock_station->flags |= DOCK_IS_DOCK; if (is_ata(handle)) dock_station->flags |= DOCK_IS_ATA; if (is_battery(handle)) dock_station->flags |= DOCK_IS_BAT; ret = sysfs_create_group(&dd->dev.kobj, &dock_attribute_group); if (ret) goto err_unregister; /* Find dependent devices */ acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, find_dock_devices, NULL, dock_station, NULL); /* add the dock station as a device dependent on itself */ ret = add_dock_dependent_device(dock_station, handle); if (ret) goto err_rmgroup; dock_station_count++; list_add(&dock_station->sibling, &dock_stations); return 0; err_rmgroup: sysfs_remove_group(&dd->dev.kobj, &dock_attribute_group); err_unregister: platform_device_unregister(dd); printk(KERN_ERR "%s encountered error %d\n", __func__, ret); return ret; } /** * dock_remove - free up resources related to the dock station */ static int dock_remove(struct dock_station *ds) { struct dock_dependent_device *dd, *tmp; struct platform_device *dock_device = ds->dock_device; if (!dock_station_count) return 0; /* remove dependent devices */ list_for_each_entry_safe(dd, tmp, &ds->dependent_devices, list) kfree(dd); list_del(&ds->sibling); /* cleanup sysfs */ sysfs_remove_group(&dock_device->dev.kobj, &dock_attribute_group); platform_device_unregister(dock_device); return 0; } /** * find_dock - look for a dock station * @handle: acpi handle of a device * @lvl: unused * @context: counter of dock stations found * @rv: unused * * This is called by acpi_walk_namespace to look for dock stations. */ static __init acpi_status find_dock(acpi_handle handle, u32 lvl, void *context, void **rv) { if (is_dock(handle)) dock_add(handle); return AE_OK; } static __init acpi_status find_bay(acpi_handle handle, u32 lvl, void *context, void **rv) { /* If bay is a dock, it's already handled */ if (is_ejectable_bay(handle) && !is_dock(handle)) dock_add(handle); return AE_OK; } static int __init dock_init(void) { if (acpi_disabled) return 0; /* look for a dock station */ acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, find_dock, NULL, NULL, NULL); /* look for bay */ acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, find_bay, NULL, NULL, NULL); if (!dock_station_count) { printk(KERN_INFO PREFIX "No dock devices found.\n"); return 0; } register_acpi_bus_notifier(&dock_acpi_notifier); printk(KERN_INFO PREFIX "%s: %d docks/bays found\n", ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count); return 0; } static void __exit dock_exit(void) { struct dock_station *tmp, *dock_station; unregister_acpi_bus_notifier(&dock_acpi_notifier); list_for_each_entry_safe(dock_station, tmp, &dock_stations, sibling) dock_remove(dock_station); } /* * Must be called before drivers of devices in dock, otherwise we can't know * which devices are in a dock */ subsys_initcall(dock_init); module_exit(dock_exit);