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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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1be9c3a0a0
In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through. Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
659 lines
17 KiB
C
659 lines
17 KiB
C
/*
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* dock.c - ACPI dock station driver
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*
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* Copyright (C) 2006, 2014, Intel Corp.
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* Author: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
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* Rafael J. Wysocki <rafael.j.wysocki@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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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/moduleparam.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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ACPI_MODULE_NAME("dock");
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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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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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struct dock_dependent_device {
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struct list_head list;
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struct acpi_device *adev;
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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: Dock station.
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* @adev: Dependent ACPI device object.
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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 add_dock_dependent_device(struct dock_station *ds,
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struct acpi_device *adev)
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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->adev = adev;
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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 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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struct acpi_device *adev = dd->adev;
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acpi_lock_hp_context();
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if (!adev->hp)
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goto out;
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if (cb_type == DOCK_CALL_FIXUP) {
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void (*fixup)(struct acpi_device *);
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fixup = adev->hp->fixup;
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if (fixup) {
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acpi_unlock_hp_context();
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fixup(adev);
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return;
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}
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} else if (cb_type == DOCK_CALL_UEVENT) {
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void (*uevent)(struct acpi_device *, u32);
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uevent = adev->hp->uevent;
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if (uevent) {
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acpi_unlock_hp_context();
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uevent(adev, event);
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return;
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}
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} else {
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int (*notify)(struct acpi_device *, u32);
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notify = adev->hp->notify;
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if (notify) {
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acpi_unlock_hp_context();
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notify(adev, event);
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return;
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}
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}
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out:
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acpi_unlock_hp_context();
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}
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static struct dock_station *find_dock_station(acpi_handle handle)
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{
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struct dock_station *ds;
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list_for_each_entry(ds, &dock_stations, sibling)
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if (ds->handle == handle)
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return ds;
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return NULL;
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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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* @adev: ACPI device object to find.
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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, struct acpi_device *adev)
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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 (adev == dd->adev)
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return dd;
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return NULL;
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}
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void register_dock_dependent_device(struct acpi_device *adev,
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acpi_handle dshandle)
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{
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struct dock_station *ds = find_dock_station(dshandle);
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if (ds && !find_dock_dependent_device(ds, adev))
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add_dock_dependent_device(ds, adev);
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}
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/*****************************************************************************
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* Dock functions *
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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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* @adev: ACPI device object to check.
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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(struct acpi_device *adev)
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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(adev->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, adev))
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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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* 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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acpi_bus_trim(dd->adev);
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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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* Check if all devices have been enumerated already. If not, run
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* acpi_bus_scan() for them and that will cause scan handlers to be
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* attached to device objects or acpi_drivers to be stopped/started if
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* they are present.
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*/
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list_for_each_entry(dd, &ds->dependent_devices, list) {
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struct acpi_device *adev = dd->adev;
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if (!acpi_device_enumerated(adev)) {
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int ret = acpi_bus_scan(adev->handle);
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if (ret)
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dev_dbg(&adev->dev, "scan error %d\n", -ret);
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}
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}
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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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* handle_eject_request - handle an undock request checking for error conditions
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*
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* Check to make sure the dock device is still present, then undock and
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* hotremove all the devices that may need removing.
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*/
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static int handle_eject_request(struct dock_station *ds, u32 event)
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{
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if (dock_in_progress(ds))
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return -EBUSY;
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/*
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* here we need to generate the undock
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* event prior to actually doing the undock
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* so that the device struct still exists.
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* Also, even send the dock event if the
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* device is not present anymore
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*/
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dock_event(ds, event, UNDOCK_EVENT);
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hot_remove_dock_devices(ds);
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undock(ds);
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acpi_evaluate_lck(ds->handle, 0);
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acpi_evaluate_ej0(ds->handle);
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if (dock_present(ds)) {
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acpi_handle_err(ds->handle, "Unable to undock!\n");
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return -EBUSY;
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}
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complete_undock(ds);
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return 0;
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}
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/**
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* dock_notify - Handle ACPI dock notification.
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* @adev: Dock station's ACPI device object.
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* @event: Event code.
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*
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* If we are notified to dock, then check to see if the dock is
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* present and then dock. Notify all drivers of the dock event,
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* and then hotplug and devices that may need hotplugging.
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*/
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int dock_notify(struct acpi_device *adev, u32 event)
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{
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acpi_handle handle = adev->handle;
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struct dock_station *ds = find_dock_station(handle);
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int surprise_removal = 0;
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if (!ds)
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return -ENODEV;
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/*
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* According to acpi spec 3.0a, if a DEVICE_CHECK notification
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* is sent and _DCK is present, it is assumed to mean an undock
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* request.
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*/
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if ((ds->flags & DOCK_IS_DOCK) && event == ACPI_NOTIFY_DEVICE_CHECK)
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event = ACPI_NOTIFY_EJECT_REQUEST;
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/*
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* dock station: BUS_CHECK - docked or surprise removal
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* DEVICE_CHECK - undocked
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* other device: BUS_CHECK/DEVICE_CHECK - added or surprise removal
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*
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* To simplify event handling, dock dependent device handler always
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* get ACPI_NOTIFY_BUS_CHECK/ACPI_NOTIFY_DEVICE_CHECK for add and
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* ACPI_NOTIFY_EJECT_REQUEST for removal
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*/
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switch (event) {
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case ACPI_NOTIFY_BUS_CHECK:
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case ACPI_NOTIFY_DEVICE_CHECK:
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if (!dock_in_progress(ds) && !acpi_device_enumerated(adev)) {
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begin_dock(ds);
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dock(ds);
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if (!dock_present(ds)) {
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acpi_handle_err(handle, "Unable to dock!\n");
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complete_dock(ds);
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break;
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}
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hotplug_dock_devices(ds, event);
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complete_dock(ds);
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dock_event(ds, event, DOCK_EVENT);
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acpi_evaluate_lck(ds->handle, 1);
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acpi_update_all_gpes();
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break;
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}
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if (dock_present(ds) || dock_in_progress(ds))
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break;
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/* This is a surprise removal */
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surprise_removal = 1;
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event = ACPI_NOTIFY_EJECT_REQUEST;
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/* Fall back */
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/* fall through */
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case ACPI_NOTIFY_EJECT_REQUEST:
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begin_undock(ds);
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if ((immediate_undock && !(ds->flags & DOCK_IS_ATA))
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|| surprise_removal)
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handle_eject_request(ds, event);
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else
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dock_event(ds, event, UNDOCK_EVENT);
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break;
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}
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return 0;
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}
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/*
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* show_docked - read method for "docked" file in sysfs
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*/
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static ssize_t show_docked(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dock_station *dock_station = dev->platform_data;
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struct acpi_device *adev = NULL;
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acpi_bus_get_device(dock_station->handle, &adev);
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return snprintf(buf, PAGE_SIZE, "%u\n", acpi_device_enumerated(adev));
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}
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static DEVICE_ATTR(docked, S_IRUGO, show_docked, NULL);
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/*
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* show_flags - read method for flags file in sysfs
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*/
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static ssize_t show_flags(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct dock_station *dock_station = dev->platform_data;
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return snprintf(buf, PAGE_SIZE, "%d\n", dock_station->flags);
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}
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static DEVICE_ATTR(flags, S_IRUGO, show_flags, NULL);
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/*
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* write_undock - write method for "undock" file in sysfs
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*/
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static ssize_t write_undock(struct device *dev, struct device_attribute *attr,
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|
const char *buf, size_t count)
|
|
{
|
|
int ret;
|
|
struct dock_station *dock_station = dev->platform_data;
|
|
|
|
if (!count)
|
|
return -EINVAL;
|
|
|
|
acpi_scan_lock_acquire();
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|
begin_undock(dock_station);
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|
ret = handle_eject_request(dock_station, ACPI_NOTIFY_EJECT_REQUEST);
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|
acpi_scan_lock_release();
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|
return ret ? ret: count;
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|
}
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|
static DEVICE_ATTR(undock, S_IWUSR, NULL, write_undock);
|
|
|
|
/*
|
|
* show_dock_uid - read method for "uid" file in sysfs
|
|
*/
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|
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 const struct attribute_group dock_attribute_group = {
|
|
.attrs = dock_attributes
|
|
};
|
|
|
|
/**
|
|
* acpi_dock_add - Add a new dock station
|
|
* @adev: Dock station ACPI device object.
|
|
*
|
|
* allocated and initialize a new dock station device.
|
|
*/
|
|
void acpi_dock_add(struct acpi_device *adev)
|
|
{
|
|
struct dock_station *dock_station, ds = { NULL, };
|
|
struct platform_device_info pdevinfo;
|
|
acpi_handle handle = adev->handle;
|
|
struct platform_device *dd;
|
|
int ret;
|
|
|
|
memset(&pdevinfo, 0, sizeof(pdevinfo));
|
|
pdevinfo.name = "dock";
|
|
pdevinfo.id = dock_station_count;
|
|
pdevinfo.fwnode = acpi_fwnode_handle(adev);
|
|
pdevinfo.data = &ds;
|
|
pdevinfo.size_data = sizeof(ds);
|
|
dd = platform_device_register_full(&pdevinfo);
|
|
if (IS_ERR(dd))
|
|
return;
|
|
|
|
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 (acpi_device_is_battery(adev))
|
|
dock_station->flags |= DOCK_IS_BAT;
|
|
|
|
ret = sysfs_create_group(&dd->dev.kobj, &dock_attribute_group);
|
|
if (ret)
|
|
goto err_unregister;
|
|
|
|
/* add the dock station as a device dependent on itself */
|
|
ret = add_dock_dependent_device(dock_station, adev);
|
|
if (ret)
|
|
goto err_rmgroup;
|
|
|
|
dock_station_count++;
|
|
list_add(&dock_station->sibling, &dock_stations);
|
|
adev->flags.is_dock_station = true;
|
|
dev_info(&adev->dev, "ACPI dock station (docks/bays count: %d)\n",
|
|
dock_station_count);
|
|
return;
|
|
|
|
err_rmgroup:
|
|
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);
|
|
}
|