acpi-video-detect: Rewrite backlight interface selection logic
Currently we have 2 kernel commandline options + dmi-quirks in 3 places all interacting (in interesting ways) to select which which backlight interface to use. On the commandline we've acpi_backlight=[video|vendor] and video.use_native_backlight=[0|1]. DMI quirks we have in acpi/video-detect.c, acpi/video.c and drivers/platform/x86/*.c . This commit is the first step to cleaning this up, replacing the 2 cmdline options with just acpi_backlight=[video|vendor|native|none], and adds a new API to video_detect.c to reflect this. Follow up commits will also move other related code, like unregistering the acpi_video backlight interface if it was registered before other drivers which take priority over it are loaded, to video_detect.c where this logic really belongs. 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
Rafael J. Wysocki
Родитель
14ca7a47d0
Коммит
87521e16a7
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@ -1,4 +1,6 @@
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/*
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* Copyright (C) 2015 Red Hat Inc.
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* Hans de Goede <hdegoede@redhat.com>
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* Copyright (C) 2008 SuSE Linux Products GmbH
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* Thomas Renninger <trenn@suse.de>
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*
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@ -9,44 +11,45 @@
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* acpi_get_pci_dev() can be called to identify ACPI graphics
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* devices for which a real graphics card is plugged in
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*
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* Now acpi_video_get_capabilities() can be called to check which
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* capabilities the graphics cards plugged in support. The check for general
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* video capabilities will be triggered by the first caller of
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* acpi_video_get_capabilities(NULL); which will happen when the first
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* backlight switching supporting driver calls:
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* acpi_video_backlight_support();
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*
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* Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B)
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* are available, video.ko should be used to handle the device.
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*
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* Otherwise vendor specific drivers like thinkpad_acpi, asus-laptop,
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* sony_acpi,... can take care about backlight brightness.
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*
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* If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
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* this file will not be compiled, acpi_video_get_capabilities() and
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* acpi_video_backlight_support() will always return 0 and vendor specific
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* drivers always can handle backlight.
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* Backlight drivers can use acpi_video_get_backlight_type() to determine
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* which driver should handle the backlight.
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*
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* If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m)
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* this file will not be compiled and acpi_video_get_backlight_type() will
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* always return acpi_backlight_vendor.
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*/
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#include <linux/export.h>
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#include <linux/acpi.h>
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#include <linux/backlight.h>
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#include <linux/dmi.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/types.h>
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#include <acpi/video.h>
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ACPI_MODULE_NAME("video");
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#define _COMPONENT ACPI_VIDEO_COMPONENT
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static long acpi_video_support;
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static bool acpi_video_caps_checked;
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static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
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static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
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static void acpi_video_parse_cmdline(void)
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{
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if (!strcmp("vendor", acpi_video_backlight_string))
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acpi_video_support |= ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR;
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acpi_backlight_cmdline = acpi_backlight_vendor;
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if (!strcmp("video", acpi_video_backlight_string))
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acpi_video_support |= ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO;
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acpi_backlight_cmdline = acpi_backlight_video;
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if (!strcmp("native", acpi_video_backlight_string))
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acpi_backlight_cmdline = acpi_backlight_native;
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if (!strcmp("none", acpi_video_backlight_string))
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acpi_backlight_cmdline = acpi_backlight_none;
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}
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static acpi_status
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@ -77,7 +80,7 @@ find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
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* buggy */
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static int video_detect_force_vendor(const struct dmi_system_id *d)
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{
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acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
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acpi_backlight_dmi = acpi_backlight_vendor;
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return 0;
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}
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@ -125,99 +128,91 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
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};
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/*
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* Returns the video capabilities of a specific ACPI graphics device
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* Determine which type of backlight interface to use on this system,
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* First check cmdline, then dmi quirks, then do autodetect.
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*
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* if NULL is passed as argument all ACPI devices are enumerated and
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* all graphics capabilities of physically present devices are
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* summarized and returned. This is cached and done only once.
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* The autodetect order is:
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* 1) Is the acpi-video backlight interface supported ->
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* no, use a vendor interface
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* 2) Is this a win8 "ready" BIOS and do we have a native interface ->
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* yes, use a native interface
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* 3) Else use the acpi-video interface
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*
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* Arguably the native on win8 check should be done first, but that would
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* be a behavior change, which may causes issues.
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*/
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static long acpi_video_get_capabilities(acpi_handle graphics_handle)
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enum acpi_backlight_type acpi_video_get_backlight_type(void)
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{
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long caps = 0;
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struct acpi_device *tmp_dev;
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acpi_status status;
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static DEFINE_MUTEX(init_mutex);
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static bool init_done;
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static long video_caps;
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if (acpi_video_caps_checked && graphics_handle == NULL)
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return acpi_video_support;
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if (!graphics_handle) {
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/* Only do the global walk through all graphics devices once */
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/* Parse cmdline, dmi and acpi only once */
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mutex_lock(&init_mutex);
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if (!init_done) {
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acpi_video_parse_cmdline();
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dmi_check_system(video_detect_dmi_table);
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acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX, find_video, NULL,
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&caps, NULL);
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/* There might be boot param flags set already... */
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acpi_video_support |= caps;
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acpi_video_caps_checked = 1;
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/* Add blacklists here. Be careful to use the right *DMI* bits
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* to still be able to override logic via boot params, e.g.:
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*
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* if (dmi_name_in_vendors("XY")) {
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* acpi_video_support |=
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* ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
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*}
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*/
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dmi_check_system(video_detect_dmi_table);
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} else {
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status = acpi_bus_get_device(graphics_handle, &tmp_dev);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Invalid device"));
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return 0;
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}
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acpi_walk_namespace(ACPI_TYPE_DEVICE, graphics_handle,
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ACPI_UINT32_MAX, find_video, NULL,
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&caps, NULL);
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&video_caps, NULL);
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init_done = true;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "We have 0x%lX video support %s %s\n",
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graphics_handle ? caps : acpi_video_support,
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graphics_handle ? "on device " : "in general",
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graphics_handle ? acpi_device_bid(tmp_dev) : ""));
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return caps;
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}
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mutex_unlock(&init_mutex);
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static void acpi_video_caps_check(void)
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{
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/*
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* We must check whether the ACPI graphics device is physically plugged
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* in. Therefore this must be called after binding PCI and ACPI devices
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*/
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if (!acpi_video_caps_checked) {
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acpi_video_parse_cmdline();
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acpi_video_get_capabilities(NULL);
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}
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}
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if (acpi_backlight_cmdline != acpi_backlight_undef)
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return acpi_backlight_cmdline;
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/* Promote the vendor interface instead of the generic video module.
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* This function allow DMI blacklists to be implemented by externals
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if (acpi_backlight_dmi != acpi_backlight_undef)
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return acpi_backlight_dmi;
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if (!(video_caps & ACPI_VIDEO_BACKLIGHT))
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return acpi_backlight_vendor;
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if (acpi_osi_is_win8() && backlight_device_registered(BACKLIGHT_RAW))
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return acpi_backlight_native;
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return acpi_backlight_video;
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}
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EXPORT_SYMBOL(acpi_video_get_backlight_type);
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/*
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* Set the preferred backlight interface type based on DMI info.
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* This function allows DMI blacklists to be implemented by external
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* platform drivers instead of putting a big blacklist in video_detect.c
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*/
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void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
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{
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acpi_backlight_dmi = type;
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}
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EXPORT_SYMBOL(acpi_video_set_dmi_backlight_type);
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/*
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* Compatiblity function, this is going away as soon as all drivers are
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* converted to acpi_video_set_dmi_backlight_type().
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*
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* Promote the vendor interface instead of the generic video module.
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* After calling this function you will probably want to call
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* acpi_video_unregister() to make sure the video module is not loaded
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*/
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void acpi_video_dmi_promote_vendor(void)
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{
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acpi_video_caps_check();
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acpi_video_support |= ACPI_VIDEO_BACKLIGHT_DMI_VENDOR;
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acpi_video_set_dmi_backlight_type(acpi_backlight_vendor);
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}
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EXPORT_SYMBOL(acpi_video_dmi_promote_vendor);
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/* Returns true if video.ko can do backlight switching */
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/*
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* Compatiblity function, this is going away as soon as all drivers are
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* converted to acpi_video_get_backlight_type().
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*
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* Returns true if video.ko can do backlight switching.
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*/
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int acpi_video_backlight_support(void)
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{
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acpi_video_caps_check();
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/* First check for boot param -> highest prio */
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if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR)
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return 0;
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else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO)
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return 1;
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/* Then check for DMI blacklist -> second highest prio */
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if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VENDOR)
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return 0;
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else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VIDEO)
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return 1;
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/* Then go the default way */
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return acpi_video_support & ACPI_VIDEO_BACKLIGHT;
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/*
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* This is done this way since vendor drivers call this to see
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* if they should load, and we do not want them to load for both
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* the acpi_backlight_video and acpi_backlight_native cases.
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*/
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return acpi_video_get_backlight_type() != acpi_backlight_vendor;
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}
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EXPORT_SYMBOL(acpi_video_backlight_support);
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@ -16,6 +16,14 @@ struct acpi_device;
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#define ACPI_VIDEO_DISPLAY_LEGACY_PANEL 0x0110
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#define ACPI_VIDEO_DISPLAY_LEGACY_TV 0x0200
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enum acpi_backlight_type {
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acpi_backlight_undef = -1,
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acpi_backlight_none = 0,
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acpi_backlight_video,
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acpi_backlight_vendor,
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acpi_backlight_native,
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};
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#if (defined CONFIG_ACPI_VIDEO || defined CONFIG_ACPI_VIDEO_MODULE)
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extern int acpi_video_register(void);
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extern void acpi_video_unregister(void);
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@ -23,6 +31,8 @@ extern void acpi_video_unregister_backlight(void);
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extern int acpi_video_get_edid(struct acpi_device *device, int type,
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int device_id, void **edid);
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extern bool acpi_video_verify_backlight_support(void);
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extern enum acpi_backlight_type acpi_video_get_backlight_type(void);
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extern void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type);
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#else
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static inline int acpi_video_register(void) { return 0; }
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static inline void acpi_video_unregister(void) { return; }
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@ -33,6 +43,13 @@ static inline int acpi_video_get_edid(struct acpi_device *device, int type,
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return -ENODEV;
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}
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static inline bool acpi_video_verify_backlight_support(void) { return false; }
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static inline enum acpi_backlight_type acpi_video_get_backlight_type(void)
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{
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return acpi_backlight_vendor;
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}
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static void acpi_video_set_dmi_backlight_type(enum acpi_backlight_type type)
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{
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}
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#endif
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#endif
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