diff options
Diffstat (limited to 'drivers/acpi/dock.c')
| -rw-r--r-- | drivers/acpi/dock.c | 1081 |
1 files changed, 1081 insertions, 0 deletions
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c new file mode 100644 index 00000000..3fe29e99 --- /dev/null +++ b/drivers/acpi/dock.c @@ -0,0 +1,1081 @@ +/* + * 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); + 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 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 acpi_status +find_dock(acpi_handle handle, u32 lvl, void *context, void **rv) +{ + if (is_dock(handle)) + dock_add(handle); + + return AE_OK; +} + +static 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); |