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![Rafael J. Wysocki](/assets/img/avatar_default.png)
After recent ACPI core changes acpi_bus_get_device() will always
succeed for dock station ACPI device objects, so show_docked()
should not use that function's return value as an indicator of
whether or not the dock device is present.
Make it use acpi_device_enumerated() for this purpose.
Fixes: 202317a573
(ACPI / scan: Add acpi_device objects for all device nodes in the namespace)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
908 lines
24 KiB
C
908 lines
24 KiB
C
/*
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* dock.c - ACPI dock station driver
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*
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* Copyright (C) 2006 Kristen Carlson Accardi <kristen.c.accardi@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/notifier.h>
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#include <linux/platform_device.h>
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#include <linux/jiffies.h>
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#include <linux/stddef.h>
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#include <linux/acpi.h>
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#include "internal.h"
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#define PREFIX "ACPI: "
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#define ACPI_DOCK_DRIVER_DESCRIPTION "ACPI Dock Station Driver"
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ACPI_MODULE_NAME("dock");
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MODULE_AUTHOR("Kristen Carlson Accardi");
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MODULE_DESCRIPTION(ACPI_DOCK_DRIVER_DESCRIPTION);
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MODULE_LICENSE("GPL");
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static bool immediate_undock = 1;
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module_param(immediate_undock, bool, 0644);
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MODULE_PARM_DESC(immediate_undock, "1 (default) will cause the driver to "
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"undock immediately when the undock button is pressed, 0 will cause"
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" the driver to wait for userspace to write the undock sysfs file "
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" before undocking");
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static const struct acpi_device_id dock_device_ids[] = {
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{"LNXDOCK", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, dock_device_ids);
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struct dock_station {
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acpi_handle handle;
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unsigned long last_dock_time;
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u32 flags;
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struct list_head dependent_devices;
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struct list_head sibling;
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struct platform_device *dock_device;
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};
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static LIST_HEAD(dock_stations);
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static int dock_station_count;
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static DEFINE_MUTEX(hotplug_lock);
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struct dock_dependent_device {
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struct list_head list;
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acpi_handle handle;
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const struct acpi_dock_ops *hp_ops;
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void *hp_context;
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unsigned int hp_refcount;
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void (*hp_release)(void *);
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};
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#define DOCK_DOCKING 0x00000001
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#define DOCK_UNDOCKING 0x00000002
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#define DOCK_IS_DOCK 0x00000010
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#define DOCK_IS_ATA 0x00000020
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#define DOCK_IS_BAT 0x00000040
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#define DOCK_EVENT 3
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#define UNDOCK_EVENT 2
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enum dock_callback_type {
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DOCK_CALL_HANDLER,
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DOCK_CALL_FIXUP,
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DOCK_CALL_UEVENT,
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};
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/*****************************************************************************
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* Dock Dependent device functions *
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*****************************************************************************/
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/**
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* add_dock_dependent_device - associate a device with the dock station
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* @ds: The dock station
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* @handle: handle of the dependent device
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*
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* Add the dependent device to the dock's dependent device list.
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*/
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static int __init
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add_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
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{
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struct dock_dependent_device *dd;
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dd = kzalloc(sizeof(*dd), GFP_KERNEL);
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if (!dd)
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return -ENOMEM;
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dd->handle = handle;
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INIT_LIST_HEAD(&dd->list);
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list_add_tail(&dd->list, &ds->dependent_devices);
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return 0;
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}
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static void remove_dock_dependent_devices(struct dock_station *ds)
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{
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struct dock_dependent_device *dd, *aux;
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list_for_each_entry_safe(dd, aux, &ds->dependent_devices, list) {
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list_del(&dd->list);
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kfree(dd);
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}
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}
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/**
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* dock_init_hotplug - Initialize a hotplug device on a docking station.
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* @dd: Dock-dependent device.
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* @ops: Dock operations to attach to the dependent device.
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* @context: Data to pass to the @ops callbacks and @release.
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* @init: Optional initialization routine to run after setting up context.
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* @release: Optional release routine to run on removal.
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*/
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static int dock_init_hotplug(struct dock_dependent_device *dd,
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const struct acpi_dock_ops *ops, void *context,
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void (*init)(void *), void (*release)(void *))
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{
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int ret = 0;
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mutex_lock(&hotplug_lock);
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if (WARN_ON(dd->hp_context)) {
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ret = -EEXIST;
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} else {
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dd->hp_refcount = 1;
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dd->hp_ops = ops;
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dd->hp_context = context;
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dd->hp_release = release;
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if (init)
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init(context);
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}
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mutex_unlock(&hotplug_lock);
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return ret;
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}
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/**
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* dock_release_hotplug - Decrement hotplug reference counter of dock device.
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* @dd: Dock-dependent device.
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*
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* Decrement the reference counter of @dd and if 0, detach its hotplug
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* operations from it, reset its context pointer and run the optional release
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* routine if present.
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*/
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static void dock_release_hotplug(struct dock_dependent_device *dd)
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{
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mutex_lock(&hotplug_lock);
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if (dd->hp_context && !--dd->hp_refcount) {
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void (*release)(void *) = dd->hp_release;
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void *context = dd->hp_context;
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dd->hp_ops = NULL;
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dd->hp_context = NULL;
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dd->hp_release = NULL;
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if (release)
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release(context);
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}
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mutex_unlock(&hotplug_lock);
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}
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static void dock_hotplug_event(struct dock_dependent_device *dd, u32 event,
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enum dock_callback_type cb_type)
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{
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acpi_notify_handler cb = NULL;
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bool run = false;
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mutex_lock(&hotplug_lock);
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if (dd->hp_context) {
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run = true;
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dd->hp_refcount++;
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if (dd->hp_ops) {
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switch (cb_type) {
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case DOCK_CALL_FIXUP:
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cb = dd->hp_ops->fixup;
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break;
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case DOCK_CALL_UEVENT:
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cb = dd->hp_ops->uevent;
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break;
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default:
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cb = dd->hp_ops->handler;
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}
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}
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}
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mutex_unlock(&hotplug_lock);
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if (!run)
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return;
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if (cb)
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cb(dd->handle, event, dd->hp_context);
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dock_release_hotplug(dd);
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}
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/**
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* find_dock_dependent_device - get a device dependent on this dock
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* @ds: the dock station
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* @handle: the acpi_handle of the device we want
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*
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* iterate over the dependent device list for this dock. If the
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* dependent device matches the handle, return.
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*/
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static struct dock_dependent_device *
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find_dock_dependent_device(struct dock_station *ds, acpi_handle handle)
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{
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struct dock_dependent_device *dd;
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list_for_each_entry(dd, &ds->dependent_devices, list)
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if (handle == dd->handle)
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return dd;
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return NULL;
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}
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/*****************************************************************************
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* Dock functions *
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*****************************************************************************/
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static int __init is_battery(acpi_handle handle)
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{
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struct acpi_device_info *info;
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int ret = 1;
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if (!ACPI_SUCCESS(acpi_get_object_info(handle, &info)))
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return 0;
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if (!(info->valid & ACPI_VALID_HID))
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ret = 0;
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else
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ret = !strcmp("PNP0C0A", info->hardware_id.string);
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kfree(info);
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return ret;
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}
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/* Check whether ACPI object is an ejectable battery or disk bay */
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static bool __init is_ejectable_bay(acpi_handle handle)
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{
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if (acpi_has_method(handle, "_EJ0") && is_battery(handle))
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return true;
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return acpi_bay_match(handle);
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}
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/**
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* is_dock_device - see if a device is on a dock station
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* @handle: acpi handle of the device
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*
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* If this device is either the dock station itself,
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* or is a device dependent on the dock station, then it
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* is a dock device
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*/
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int is_dock_device(acpi_handle handle)
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{
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struct dock_station *dock_station;
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if (!dock_station_count)
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return 0;
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if (acpi_dock_match(handle))
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return 1;
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list_for_each_entry(dock_station, &dock_stations, sibling)
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if (find_dock_dependent_device(dock_station, handle))
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return 1;
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return 0;
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}
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EXPORT_SYMBOL_GPL(is_dock_device);
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/**
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* dock_present - see if the dock station is present.
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* @ds: the dock station
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*
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* execute the _STA method. note that present does not
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* imply that we are docked.
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*/
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static int dock_present(struct dock_station *ds)
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{
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unsigned long long sta;
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acpi_status status;
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if (ds) {
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status = acpi_evaluate_integer(ds->handle, "_STA", NULL, &sta);
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if (ACPI_SUCCESS(status) && sta)
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return 1;
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}
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return 0;
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}
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/**
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* dock_create_acpi_device - add new devices to acpi
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* @handle - handle of the device to add
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*
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* This function will create a new acpi_device for the given
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* handle if one does not exist already. This should cause
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* acpi to scan for drivers for the given devices, and call
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* matching driver's add routine.
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*/
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static void dock_create_acpi_device(acpi_handle handle)
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{
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struct acpi_device *device = NULL;
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int ret;
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acpi_bus_get_device(handle, &device);
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if (!acpi_device_enumerated(device)) {
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ret = acpi_bus_scan(handle);
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if (ret)
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pr_debug("error adding bus, %x\n", -ret);
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}
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}
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/**
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* dock_remove_acpi_device - remove the acpi_device struct from acpi
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* @handle - the handle of the device to remove
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*
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* Tell acpi to remove the acpi_device. This should cause any loaded
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* driver to have it's remove routine called.
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*/
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static void dock_remove_acpi_device(acpi_handle handle)
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{
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struct acpi_device *device;
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if (!acpi_bus_get_device(handle, &device))
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acpi_bus_trim(device);
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}
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/**
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* hot_remove_dock_devices - Remove dock station devices.
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* @ds: Dock station.
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*/
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static void hot_remove_dock_devices(struct dock_station *ds)
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{
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struct dock_dependent_device *dd;
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/*
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* Walk the list in reverse order so that devices that have been added
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* last are removed first (in case there are some indirect dependencies
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* between them).
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*/
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list_for_each_entry_reverse(dd, &ds->dependent_devices, list)
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dock_hotplug_event(dd, ACPI_NOTIFY_EJECT_REQUEST, false);
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list_for_each_entry_reverse(dd, &ds->dependent_devices, list)
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dock_remove_acpi_device(dd->handle);
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}
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/**
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* hotplug_dock_devices - Insert devices on a dock station.
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* @ds: the dock station
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* @event: either bus check or device check request
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*
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* Some devices on the dock station need to have drivers called
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* to perform hotplug operations after a dock event has occurred.
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* Traverse the list of dock devices that have registered a
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* hotplug handler, and call the handler.
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*/
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static void hotplug_dock_devices(struct dock_station *ds, u32 event)
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{
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struct dock_dependent_device *dd;
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/* Call driver specific post-dock fixups. */
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list_for_each_entry(dd, &ds->dependent_devices, list)
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dock_hotplug_event(dd, event, DOCK_CALL_FIXUP);
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/* Call driver specific hotplug functions. */
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list_for_each_entry(dd, &ds->dependent_devices, list)
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dock_hotplug_event(dd, event, DOCK_CALL_HANDLER);
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/*
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* Now make sure that an acpi_device is created for each dependent
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* device. That will cause scan handlers to be attached to device
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* objects or acpi_drivers to be stopped/started if they are present.
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*/
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list_for_each_entry(dd, &ds->dependent_devices, list)
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dock_create_acpi_device(dd->handle);
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}
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static void dock_event(struct dock_station *ds, u32 event, int num)
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{
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struct device *dev = &ds->dock_device->dev;
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char event_string[13];
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char *envp[] = { event_string, NULL };
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struct dock_dependent_device *dd;
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if (num == UNDOCK_EVENT)
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sprintf(event_string, "EVENT=undock");
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else
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sprintf(event_string, "EVENT=dock");
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/*
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* Indicate that the status of the dock station has
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* changed.
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*/
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if (num == DOCK_EVENT)
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kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
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list_for_each_entry(dd, &ds->dependent_devices, list)
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dock_hotplug_event(dd, event, DOCK_CALL_UEVENT);
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if (num != DOCK_EVENT)
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kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
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}
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/**
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* handle_dock - handle a dock event
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* @ds: the dock station
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* @dock: to dock, or undock - that is the question
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*
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* Execute the _DCK method in response to an acpi event
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*/
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static void handle_dock(struct dock_station *ds, int dock)
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{
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acpi_status status;
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struct acpi_object_list arg_list;
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union acpi_object arg;
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unsigned long long value;
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acpi_handle_info(ds->handle, "%s\n", dock ? "docking" : "undocking");
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/* _DCK method has one argument */
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arg_list.count = 1;
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arg_list.pointer = &arg;
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arg.type = ACPI_TYPE_INTEGER;
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arg.integer.value = dock;
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status = acpi_evaluate_integer(ds->handle, "_DCK", &arg_list, &value);
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if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
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acpi_handle_err(ds->handle, "Failed to execute _DCK (0x%x)\n",
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status);
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}
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static inline void dock(struct dock_station *ds)
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{
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handle_dock(ds, 1);
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}
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static inline void undock(struct dock_station *ds)
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{
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handle_dock(ds, 0);
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}
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static inline void begin_dock(struct dock_station *ds)
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{
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ds->flags |= DOCK_DOCKING;
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}
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static inline void complete_dock(struct dock_station *ds)
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{
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ds->flags &= ~(DOCK_DOCKING);
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ds->last_dock_time = jiffies;
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}
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static inline void begin_undock(struct dock_station *ds)
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{
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ds->flags |= DOCK_UNDOCKING;
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}
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static inline void complete_undock(struct dock_station *ds)
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{
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ds->flags &= ~(DOCK_UNDOCKING);
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}
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/**
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* dock_in_progress - see if we are in the middle of handling a dock event
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* @ds: the dock station
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*
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* Sometimes while docking, false dock events can be sent to the driver
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* because good connections aren't made or some other reason. Ignore these
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* if we are in the middle of doing something.
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*/
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static int dock_in_progress(struct dock_station *ds)
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{
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if ((ds->flags & DOCK_DOCKING) ||
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time_before(jiffies, (ds->last_dock_time + HZ)))
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return 1;
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return 0;
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}
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/**
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* register_hotplug_dock_device - register a hotplug function
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* @handle: the handle of the device
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* @ops: handlers to call after docking
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* @context: device specific data
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* @init: Optional initialization routine to run after registration
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* @release: Optional release routine to run on unregistration
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*
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* If a driver would like to perform a hotplug operation after a dock
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* event, they can register an acpi_notifiy_handler to be called by
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* the dock driver after _DCK is executed.
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*/
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int register_hotplug_dock_device(acpi_handle handle,
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const struct acpi_dock_ops *ops, void *context,
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void (*init)(void *), void (*release)(void *))
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{
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struct dock_dependent_device *dd;
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struct dock_station *dock_station;
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int ret = -EINVAL;
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if (WARN_ON(!context))
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return -EINVAL;
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if (!dock_station_count)
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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 && !dock_init_hotplug(dd, ops, context, init, release))
|
|
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_release_hotplug(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);
|
|
|
|
hot_remove_dock_devices(ds);
|
|
undock(ds);
|
|
acpi_evaluate_lck(ds->handle, 0);
|
|
acpi_evaluate_ej0(ds->handle);
|
|
if (dock_present(ds)) {
|
|
acpi_handle_err(ds->handle, "Unable to undock!\n");
|
|
return -EBUSY;
|
|
}
|
|
complete_undock(ds);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* dock_notify - act upon an acpi dock notification
|
|
* @ds: dock station
|
|
* @event: the acpi event
|
|
*
|
|
* 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(struct dock_station *ds, u32 event)
|
|
{
|
|
acpi_handle handle = ds->handle;
|
|
struct acpi_device *adev = NULL;
|
|
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:
|
|
acpi_bus_get_device(handle, &adev);
|
|
if (!dock_in_progress(ds) && !acpi_device_enumerated(adev)) {
|
|
begin_dock(ds);
|
|
dock(ds);
|
|
if (!dock_present(ds)) {
|
|
acpi_handle_err(handle, "Unable to dock!\n");
|
|
complete_dock(ds);
|
|
break;
|
|
}
|
|
hotplug_dock_devices(ds, event);
|
|
complete_dock(ds);
|
|
dock_event(ds, event, DOCK_EVENT);
|
|
acpi_evaluate_lck(ds->handle, 1);
|
|
acpi_update_all_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:
|
|
acpi_handle_err(handle, "Unknown dock event %d\n", event);
|
|
}
|
|
}
|
|
|
|
static void acpi_dock_deferred_cb(void *data, u32 event)
|
|
{
|
|
acpi_scan_lock_acquire();
|
|
dock_notify(data, event);
|
|
acpi_scan_lock_release();
|
|
}
|
|
|
|
static void dock_notify_handler(acpi_handle handle, u32 event, void *data)
|
|
{
|
|
if (event != ACPI_NOTIFY_BUS_CHECK && event != ACPI_NOTIFY_DEVICE_CHECK
|
|
&& event != ACPI_NOTIFY_EJECT_REQUEST)
|
|
return;
|
|
|
|
acpi_hotplug_execute(acpi_dock_deferred_cb, data, event);
|
|
}
|
|
|
|
/**
|
|
* 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 __init find_dock_devices(acpi_handle handle, u32 lvl,
|
|
void *context, void **rv)
|
|
{
|
|
struct dock_station *ds = context;
|
|
acpi_handle ejd = NULL;
|
|
|
|
acpi_bus_get_ejd(handle, &ejd);
|
|
if (ejd == ds->handle)
|
|
add_dock_dependent_device(ds, handle);
|
|
|
|
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 dock_station *dock_station = dev->platform_data;
|
|
struct acpi_device *adev = NULL;
|
|
|
|
acpi_bus_get_device(dock_station->handle, &adev);
|
|
return snprintf(buf, PAGE_SIZE, "%u\n", acpi_device_enumerated(adev));
|
|
}
|
|
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;
|
|
|
|
acpi_scan_lock_acquire();
|
|
begin_undock(dock_station);
|
|
ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST);
|
|
acpi_scan_lock_release();
|
|
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)
|
|
{
|
|
struct dock_station *dock_station, ds = { NULL, };
|
|
struct platform_device *dd;
|
|
acpi_status status;
|
|
int ret;
|
|
|
|
dd = platform_device_register_data(NULL, "dock", dock_station_count,
|
|
&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;
|
|
|
|
INIT_LIST_HEAD(&dock_station->sibling);
|
|
INIT_LIST_HEAD(&dock_station->dependent_devices);
|
|
|
|
/* we want the dock device to send uevents */
|
|
dev_set_uevent_suppress(&dd->dev, 0);
|
|
|
|
if (acpi_dock_match(handle))
|
|
dock_station->flags |= DOCK_IS_DOCK;
|
|
if (acpi_ata_match(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;
|
|
|
|
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);
|
|
acpi_handle_err(handle, "%s encountered error %d\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* find_dock_and_bay - look for dock stations and bays
|
|
* @handle: acpi handle of a device
|
|
* @lvl: unused
|
|
* @context: unused
|
|
* @rv: unused
|
|
*
|
|
* This is called by acpi_walk_namespace to look for dock stations and bays.
|
|
*/
|
|
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))
|
|
dock_add(handle);
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
void __init acpi_dock_init(void)
|
|
{
|
|
/* look for dock stations and bays */
|
|
acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
|
|
ACPI_UINT32_MAX, find_dock_and_bay, NULL, NULL, NULL);
|
|
|
|
if (!dock_station_count) {
|
|
pr_info(PREFIX "No dock devices found.\n");
|
|
return;
|
|
}
|
|
|
|
pr_info(PREFIX "%s: %d docks/bays found\n",
|
|
ACPI_DOCK_DRIVER_DESCRIPTION, dock_station_count);
|
|
}
|