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acpi-video-detect: video: Make video_detect code part of the video module 

This is a preparation patch for the backlight interface selection logic
cleanup, there are 2 reasons to not always build the video_detect code
into the kernel:

1) In order for the video_detect.c to also deal with / select native
backlight interfaces on win8 systems, instead of doing this in video.c
where it does not belong, video_detect.c needs to call into the backlight
class code. Which cannot be done if it is builtin and the blacklight class
is not.

2) Currently all the platform/x86 drivers which have quirks to prefer
the vendor driver over acpi-video call acpi_video_unregister_backlight()
to remove the acpi-video backlight interface, this logic really belongs
in video_detect.c, which will cause video_detect.c to depend on symbols of
video.c and video.c already depends on video_detect.c symbols, so they
really need to be a single module.

Note that this commits make 2 changes so as to maintain 100% kernel
commandline compatibility:

1) The __setup call for the acpi_backlight= handling is moved to
   acpi/util.c as __setup may only be used by code which is alwasy builtin
2) video.c is renamed to acpi_video.c so that it can be combined with
   video_detect.c into video.ko

This commit also makes changes to drivers/platform/x86/Kconfig to ensure
that drivers which use acpi_video_backlight_support() from video_detect.c,
will not be built-in when acpi_video is not built in. This also changes
some "select" uses to "depends on" to avoid dependency loops.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Hans de Goede 2015-06-16 16:27:47 +02:00 committed by Rafael J. Wysocki
parent a87878bafa
commit 14ca7a47d0
6 changed files with 47 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/acpi/Makefile
View File

@ -52,9 +52,6 @@ acpi-$(CONFIG_X86) += acpi_cmos_rtc.o
acpi-$(CONFIG_DEBUG_FS) += debugfs.o
acpi-$(CONFIG_ACPI_NUMA) += numa.o
acpi-$(CONFIG_ACPI_PROCFS_POWER) += cm_sbs.o
ifdef CONFIG_ACPI_VIDEO
acpi-y += video_detect.o
endif
acpi-y += acpi_lpat.o
acpi-$(CONFIG_ACPI_GENERIC_GSI) += gsi.o
@ -95,3 +92,5 @@ obj-$(CONFIG_ACPI_EXTLOG) += acpi_extlog.o
obj-$(CONFIG_PMIC_OPREGION) += pmic/intel_pmic.o
obj-$(CONFIG_CRC_PMIC_OPREGION) += pmic/intel_pmic_crc.o
obj-$(CONFIG_XPOWER_PMIC_OPREGION) += pmic/intel_pmic_xpower.o
video-objs += acpi_video.o video_detect.o

2
drivers/acpi/video.c → drivers/acpi/acpi_video.c
View File

@ -43,7 +43,7 @@
#include <acpi/video.h>
#include <asm/uaccess.h>
#include "internal.h"
#define PREFIX "ACPI: "
#define ACPI_VIDEO_BUS_NAME "Video Bus"
#define ACPI_VIDEO_DEVICE_NAME "Video Device"

15
drivers/acpi/utils.c
View File

@ -712,3 +712,18 @@ bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, int rev, u64 funcs)
return false;
}
EXPORT_SYMBOL(acpi_check_dsm);
/*
* acpi_backlight= handling, this is done here rather then in video_detect.c
* because __setup cannot be used in modules.
*/
char acpi_video_backlight_string[16];
EXPORT_SYMBOL(acpi_video_backlight_string);
static int __init acpi_backlight(char *str)
{
strlcpy(acpi_video_backlight_string, str,
sizeof(acpi_video_backlight_string));
return 1;
}
__setup("acpi_backlight=", acpi_backlight);

35
drivers/acpi/video_detect.c
View File

@ -32,16 +32,23 @@
#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/pci.h>
#include "internal.h"
ACPI_MODULE_NAME("video");
#define _COMPONENT ACPI_VIDEO_COMPONENT
static long acpi_video_support;
static bool acpi_video_caps_checked;
static void acpi_video_parse_cmdline(void)
{
if (!strcmp("vendor", acpi_video_backlight_string))
acpi_video_support |= ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR;
if (!strcmp("video", acpi_video_backlight_string))
acpi_video_support |= ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO;
}
static acpi_status
find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
{
@ -174,8 +181,10 @@ static void acpi_video_caps_check(void)
* We must check whether the ACPI graphics device is physically plugged
* in. Therefore this must be called after binding PCI and ACPI devices
*/
if (!acpi_video_caps_checked)
if (!acpi_video_caps_checked) {
acpi_video_parse_cmdline();
acpi_video_get_capabilities(NULL);
}
}
/* Promote the vendor interface instead of the generic video module.
@ -212,23 +221,3 @@ int acpi_video_backlight_support(void)
return acpi_video_support & ACPI_VIDEO_BACKLIGHT;
}
EXPORT_SYMBOL(acpi_video_backlight_support);
/*
* Use acpi_backlight=vendor/video to force that backlight switching
* is processed by vendor specific acpi drivers or video.ko driver.
*/
static int __init acpi_backlight(char *str)
{
if (str == NULL || *str == '\0')
return 1;
else {
if (!strcmp("vendor", str))
acpi_video_support |=
ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR;
if (!strcmp("video", str))
acpi_video_support |=
ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO;
}
return 1;
}
__setup("acpi_backlight=", acpi_backlight);

21
drivers/platform/x86/Kconfig
View File

@ -71,9 +71,10 @@ config ASUS_LAPTOP
depends on ACPI
select LEDS_CLASS
select NEW_LEDS
select BACKLIGHT_CLASS_DEVICE
depends on BACKLIGHT_CLASS_DEVICE
depends on INPUT
depends on RFKILL || RFKILL = n
depends on ACPI_VIDEO || ACPI_VIDEO = n
select INPUT_SPARSEKMAP
select INPUT_POLLDEV
---help---
@ -95,6 +96,7 @@ config DELL_LAPTOP
depends on X86
depends on DCDBAS
depends on BACKLIGHT_CLASS_DEVICE
depends on ACPI_VIDEO || ACPI_VIDEO = n
depends on RFKILL || RFKILL = n
depends on SERIO_I8042
select POWER_SUPPLY
@ -109,6 +111,7 @@ config DELL_WMI
tristate "Dell WMI extras"
depends on ACPI_WMI
depends on INPUT
depends on ACPI_VIDEO || ACPI_VIDEO = n
select INPUT_SPARSEKMAP
---help---
Say Y here if you want to support WMI-based hotkeys on Dell laptops.
@ -144,6 +147,7 @@ config FUJITSU_LAPTOP
depends on ACPI
depends on INPUT
depends on BACKLIGHT_CLASS_DEVICE
depends on ACPI_VIDEO || ACPI_VIDEO = n
depends on LEDS_CLASS || LEDS_CLASS=n
---help---
This is a driver for laptops built by Fujitsu:
@ -247,6 +251,7 @@ config MSI_LAPTOP
tristate "MSI Laptop Extras"
depends on ACPI
depends on BACKLIGHT_CLASS_DEVICE
depends on ACPI_VIDEO || ACPI_VIDEO = n
depends on RFKILL
depends on INPUT && SERIO_I8042
select INPUT_SPARSEKMAP
@ -280,6 +285,7 @@ config COMPAL_LAPTOP
tristate "Compal (and others) Laptop Extras"
depends on ACPI
depends on BACKLIGHT_CLASS_DEVICE
depends on ACPI_VIDEO || ACPI_VIDEO = n
depends on RFKILL
depends on HWMON
depends on POWER_SUPPLY
@ -296,7 +302,8 @@ config COMPAL_LAPTOP
config SONY_LAPTOP
tristate "Sony Laptop Extras"
depends on ACPI
select BACKLIGHT_CLASS_DEVICE
depends on ACPI_VIDEO || ACPI_VIDEO = n
depends on BACKLIGHT_CLASS_DEVICE
depends on INPUT
depends on RFKILL
---help---
@ -321,6 +328,7 @@ config IDEAPAD_LAPTOP
depends on RFKILL && INPUT
depends on SERIO_I8042
depends on BACKLIGHT_CLASS_DEVICE
depends on ACPI_VIDEO || ACPI_VIDEO = n
select INPUT_SPARSEKMAP
help
This is a driver for Lenovo IdeaPad netbooks contains drivers for
@ -331,8 +339,8 @@ config THINKPAD_ACPI
depends on ACPI
depends on INPUT
depends on RFKILL || RFKILL = n
select BACKLIGHT_LCD_SUPPORT
select BACKLIGHT_CLASS_DEVICE
depends on ACPI_VIDEO || ACPI_VIDEO = n
depends on BACKLIGHT_CLASS_DEVICE
select HWMON
select NVRAM
select NEW_LEDS
@ -500,8 +508,9 @@ config EEEPC_LAPTOP
depends on ACPI
depends on INPUT
depends on RFKILL || RFKILL = n
depends on ACPI_VIDEO || ACPI_VIDEO = n
depends on HOTPLUG_PCI
select BACKLIGHT_CLASS_DEVICE
depends on BACKLIGHT_CLASS_DEVICE
select HWMON
select LEDS_CLASS
select NEW_LEDS
@ -587,6 +596,7 @@ config MSI_WMI
depends on ACPI_WMI
depends on INPUT
depends on BACKLIGHT_CLASS_DEVICE
depends on ACPI_VIDEO || ACPI_VIDEO = n
select INPUT_SPARSEKMAP
help
Say Y here if you want to support WMI-based hotkeys on MSI laptops.
@ -824,6 +834,7 @@ config MXM_WMI
config INTEL_OAKTRAIL
tristate "Intel Oaktrail Platform Extras"
depends on ACPI
depends on ACPI_VIDEO || ACPI_VIDEO = n
depends on RFKILL && BACKLIGHT_CLASS_DEVICE && ACPI
---help---
Intel Oaktrail platform need this driver to provide interfaces to

1
include/linux/acpi.h
View File

@ -243,6 +243,7 @@ extern bool wmi_has_guid(const char *guid);
#define ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VENDOR 0x0400
#define ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VIDEO 0x0800
extern char acpi_video_backlight_string[];
extern long acpi_is_video_device(acpi_handle handle);
#if defined(CONFIG_ACPI_VIDEO) || defined(CONFIG_ACPI_VIDEO_MODULE)