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authorHans de Goede <hdegoede@redhat.com>2015-06-16 16:27:47 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-06-19 01:10:36 +0200
commit14ca7a47d0ab2a7a35faab130e6d9682f8ff1a46 (patch)
tree1d55bf23f608947239ee8dfe8502e346c35baa97 /drivers/acpi
parenta87878bafa1f82c20eddaf2d23780b194c35ccf5 (diff)
downloadop-kernel-dev-14ca7a47d0ab2a7a35faab130e6d9682f8ff1a46.zip
op-kernel-dev-14ca7a47d0ab2a7a35faab130e6d9682f8ff1a46.tar.gz
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>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/Makefile5
-rw-r--r--drivers/acpi/acpi_video.c (renamed from drivers/acpi/video.c)2
-rw-r--r--drivers/acpi/utils.c15
-rw-r--r--drivers/acpi/video_detect.c35
4 files changed, 30 insertions, 27 deletions
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 8a063e2..73d840b 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -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
diff --git a/drivers/acpi/video.c b/drivers/acpi/acpi_video.c
index 3bc4c68..db4f353 100644
--- a/drivers/acpi/video.c
+++ b/drivers/acpi/acpi_video.c
@@ -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"
diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index cd49a39..67c548a 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -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);
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index b2270ca..bb6133c 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -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);
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