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linux/drivers/acpi/internal.h
Rafael J. Wysocki 8e5c2b776a Revert "ACPI / video / i915: No ACPI backlight if firmware expects Windows 8" 
We attempted to address a regression introduced by commit a57f7f9
(ACPICA: Add Windows8/Server2012 string for _OSI method.) after which
ACPI video backlight support doesn't work on a number of systems,
because the relevant AML methods in the ACPI tables in their BIOSes
become useless after the BIOS has been told that the OS is compatible
with Windows 8.  That problem is tracked by the bug entry at:

https://bugzilla.kernel.org/show_bug.cgi?id=51231

Commit 8c5bd7a (ACPI / video / i915: No ACPI backlight if firmware
expects Windows 8) introduced for this purpose essentially prevented
the ACPI backlight support from being used if the BIOS had been told
that the OS was compatible with Windows 8 and the i915 driver was
loaded, in which case the backlight would always be handled by i915.
Unfortunately, however, that turned out to cause problems with
backlight to appear on multiple systems with symptoms indicating that
i915 was unable to control the backlight on those systems as
expected.

For this reason, revert commit 8c5bd7a, but leave the function
acpi_video_backlight_quirks() introduced by it, because another
commit on top of it uses that function.

References: https://lkml.org/lkml/2013/7/21/119
References: https://lkml.org/lkml/2013/7/22/261
References: https://lkml.org/lkml/2013/7/23/429
References: https://lkml.org/lkml/2013/7/23/459
References: https://lkml.org/lkml/2013/7/23/81
References: https://lkml.org/lkml/2013/7/24/27
Reported-and-tested-by: James Hogan <james@albanarts.com>
Reported-and-tested-by: Kamal Mostafa <kamal@canonical.com>
Reported-and-tested-by: Jörg Otte <jrg.otte@gmail.com>
Reported-and-tested-by: Steven Newbury <steve@snewbury.org.uk>
Reported-by: Martin Steigerwald <Martin@lichtvoll.de>
Reported-by: Kalle Valo <kvalo@adurom.com>
Tested-by: Joerg Platte <jplatte@naasa.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2013-07-26 14:59:20 +02:00

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/*
* acpi/internal.h
* For use by Linux/ACPI infrastructure, not drivers
*
* Copyright (c) 2009, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef _ACPI_INTERNAL_H_
#define _ACPI_INTERNAL_H_
#define PREFIX "ACPI: "
int init_acpi_device_notify(void);
int acpi_scan_init(void);
#ifdef CONFIG_ACPI_PCI_SLOT
void acpi_pci_slot_init(void);
#else
static inline void acpi_pci_slot_init(void) { }
#endif
void acpi_pci_root_init(void);
void acpi_pci_link_init(void);
void acpi_pci_root_hp_init(void);
void acpi_processor_init(void);
void acpi_platform_init(void);
int acpi_sysfs_init(void);
#ifdef CONFIG_ACPI_CONTAINER
void acpi_container_init(void);
#else
static inline void acpi_container_init(void) {}
#endif
#ifdef CONFIG_ACPI_DOCK
void acpi_dock_init(void);
#else
static inline void acpi_dock_init(void) {}
#endif
#ifdef CONFIG_ACPI_HOTPLUG_MEMORY
void acpi_memory_hotplug_init(void);
#else
static inline void acpi_memory_hotplug_init(void) {}
#endif
#ifdef CONFIG_X86
void acpi_cmos_rtc_init(void);
#else
static inline void acpi_cmos_rtc_init(void) {}
#endif
extern bool acpi_force_hot_remove;
void acpi_sysfs_add_hotplug_profile(struct acpi_hotplug_profile *hotplug,
const char *name);
int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
const char *hotplug_profile_name);
void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val);
#ifdef CONFIG_DEBUG_FS
extern struct dentry *acpi_debugfs_dir;
int acpi_debugfs_init(void);
#else
static inline void acpi_debugfs_init(void) { return; }
#endif
#ifdef CONFIG_X86_INTEL_LPSS
void acpi_lpss_init(void);
#else
static inline void acpi_lpss_init(void) {}
#endif
/* --------------------------------------------------------------------------
Device Node Initialization / Removal
-------------------------------------------------------------------------- */
#define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
int acpi_device_add(struct acpi_device *device,
void (*release)(struct device *));
void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
int type, unsigned long long sta);
void acpi_device_add_finalize(struct acpi_device *device);
void acpi_free_pnp_ids(struct acpi_device_pnp *pnp);
int acpi_bind_one(struct device *dev, acpi_handle handle);
int acpi_unbind_one(struct device *dev);
/* --------------------------------------------------------------------------
Power Resource
-------------------------------------------------------------------------- */
int acpi_power_init(void);
void acpi_power_resources_list_free(struct list_head *list);
int acpi_extract_power_resources(union acpi_object *package, unsigned int start,
struct list_head *list);
int acpi_add_power_resource(acpi_handle handle);
void acpi_power_add_remove_device(struct acpi_device *adev, bool add);
int acpi_power_wakeup_list_init(struct list_head *list, int *system_level);
int acpi_device_sleep_wake(struct acpi_device *dev,
int enable, int sleep_state, int dev_state);
int acpi_power_get_inferred_state(struct acpi_device *device, int *state);
int acpi_power_on_resources(struct acpi_device *device, int state);
int acpi_power_transition(struct acpi_device *device, int state);
int acpi_wakeup_device_init(void);
void acpi_early_processor_set_pdc(void);
/* --------------------------------------------------------------------------
Embedded Controller
-------------------------------------------------------------------------- */
struct acpi_ec {
acpi_handle handle;
unsigned long gpe;
unsigned long command_addr;
unsigned long data_addr;
unsigned long global_lock;
unsigned long flags;
struct mutex mutex;
wait_queue_head_t wait;
struct list_head list;
struct transaction *curr;
spinlock_t lock;
};
extern struct acpi_ec *first_ec;
int acpi_ec_init(void);
int acpi_ec_ecdt_probe(void);
int acpi_boot_ec_enable(void);
void acpi_ec_block_transactions(void);
void acpi_ec_unblock_transactions(void);
void acpi_ec_unblock_transactions_early(void);
/*--------------------------------------------------------------------------
Suspend/Resume
-------------------------------------------------------------------------- */
extern int acpi_sleep_init(void);
#ifdef CONFIG_ACPI_SLEEP
int acpi_sleep_proc_init(void);
int suspend_nvs_alloc(void);
void suspend_nvs_free(void);
int suspend_nvs_save(void);
void suspend_nvs_restore(void);
#else
static inline int acpi_sleep_proc_init(void) { return 0; }
static inline int suspend_nvs_alloc(void) { return 0; }
static inline void suspend_nvs_free(void) {}
static inline int suspend_nvs_save(void) { return 0; }
static inline void suspend_nvs_restore(void) {}
#endif
/*--------------------------------------------------------------------------
Platform bus support
-------------------------------------------------------------------------- */
struct platform_device;
int acpi_create_platform_device(struct acpi_device *adev,
const struct acpi_device_id *id);
/*--------------------------------------------------------------------------
Video
-------------------------------------------------------------------------- */
#if defined(CONFIG_ACPI_VIDEO) || defined(CONFIG_ACPI_VIDEO_MODULE)
bool acpi_video_backlight_quirks(void);
#else
static inline bool acpi_video_backlight_quirks(void) { return false; }
#endif
#endif /* _ACPI_INTERNAL_H_ */
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