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Thomas Renninger
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Len Brown
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Nov 8, 2008
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: 22c13f9d8179f4c9caecfcb60a95214562b9addc | ||
| refs/heads/master: c3d6de698c84efdbdd3781b7058bcc339ab43da8 |
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Copyright (C) 2008 SuSE Linux Products GmbH | ||
| * Thomas Renninger <trenn@suse.de> | ||
| * | ||
| * May be copied or modified under the terms of the GNU General Public License | ||
| * | ||
| * video_detect.c: | ||
| * Provides acpi_is_video_device() for early scanning of ACPI devices in scan.c | ||
| * There a Linux specific (Spec does not provide a HID for video devices) is | ||
| * assinged | ||
| * | ||
| * After PCI devices are glued with ACPI devices | ||
| * acpi_get_physical_pci_device() can be called to identify ACPI graphics | ||
| * devices for which a real graphics card is plugged in | ||
| * | ||
| * Now acpi_video_get_capabilities() can be called to check which | ||
| * capabilities the graphics cards plugged in support. The check for general | ||
| * video capabilities will be triggered by the first caller of | ||
| * acpi_video_get_capabilities(NULL); which will happen when the first | ||
| * backlight (or display output) switching supporting driver calls: | ||
| * acpi_video_backlight_support(); | ||
| * | ||
| * Depending on whether ACPI graphics extensions (cmp. ACPI spec Appendix B) | ||
| * are available, video.ko should be used to handle the device. | ||
| * | ||
| * Otherwise vendor specific drivers like thinkpad_acpi, asus_acpi, | ||
| * sony_acpi,... can take care about backlight brightness and display output | ||
| * switching. | ||
| * | ||
| * If CONFIG_ACPI_VIDEO is neither set as "compiled in" (y) nor as a module (m) | ||
| * this file will not be compiled, acpi_video_get_capabilities() and | ||
| * acpi_video_backlight_support() will always return 0 and vendor specific | ||
| * drivers always can handle backlight. | ||
| * | ||
| */ | ||
|
|
||
| #include <linux/acpi.h> | ||
| #include <linux/dmi.h> | ||
|
|
||
| ACPI_MODULE_NAME("video"); | ||
| #define ACPI_VIDEO_COMPONENT 0x08000000 | ||
| #define _COMPONENT ACPI_VIDEO_COMPONENT | ||
|
|
||
| static long acpi_video_support; | ||
| static bool acpi_video_caps_checked; | ||
|
|
||
| static acpi_status | ||
| acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context, | ||
| void **retyurn_value) | ||
| { | ||
| long *cap = context; | ||
| acpi_handle h_dummy; | ||
|
|
||
| if (ACPI_SUCCESS(acpi_get_handle(handle, "_BCM", &h_dummy)) && | ||
| ACPI_SUCCESS(acpi_get_handle(handle, "_BCL", &h_dummy))) { | ||
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight " | ||
| "support\n")); | ||
| *cap |= ACPI_VIDEO_BACKLIGHT; | ||
| /* We have backlight support, no need to scan further */ | ||
| return AE_CTRL_TERMINATE; | ||
| } | ||
| return 0; | ||
| } | ||
|
|
||
| /* Returns true if the device is a video device which can be handled by | ||
| * video.ko. | ||
| * The device will get a Linux specific CID added in scan.c to | ||
| * identify the device as an ACPI graphics device | ||
| * Be aware that the graphics device may not be physically present | ||
| * Use acpi_video_get_capabilities() to detect general ACPI video | ||
| * capabilities of present cards | ||
| */ | ||
| long acpi_is_video_device(struct acpi_device *device) | ||
| { | ||
| acpi_handle h_dummy; | ||
| long video_caps = 0; | ||
|
|
||
| if (!device) | ||
| return 0; | ||
|
|
||
| /* Does this device able to support video switching ? */ | ||
| if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) && | ||
| ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy))) | ||
| video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING; | ||
|
|
||
| /* Does this device able to retrieve a video ROM ? */ | ||
| if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy))) | ||
| video_caps |= ACPI_VIDEO_ROM_AVAILABLE; | ||
|
|
||
| /* Does this device able to configure which video head to be POSTed ? */ | ||
| if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) && | ||
| ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) && | ||
| ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy))) | ||
| video_caps |= ACPI_VIDEO_DEVICE_POSTING; | ||
|
|
||
| /* Only check for backlight functionality if one of the above hit. */ | ||
| if (video_caps) | ||
| acpi_walk_namespace(ACPI_TYPE_DEVICE, device->handle, | ||
| ACPI_UINT32_MAX, acpi_backlight_cap_match, | ||
| &video_caps, NULL); | ||
|
|
||
| return video_caps; | ||
| } | ||
| EXPORT_SYMBOL(acpi_is_video_device); | ||
|
|
||
| static acpi_status | ||
| find_video(acpi_handle handle, u32 lvl, void *context, void **rv) | ||
| { | ||
| long *cap = context; | ||
| struct device *dev; | ||
| struct acpi_device *acpi_dev; | ||
|
|
||
| const struct acpi_device_id video_ids[] = { | ||
| {ACPI_VIDEO_HID, 0}, | ||
| {"", 0}, | ||
| }; | ||
| if (acpi_bus_get_device(handle, &acpi_dev)) | ||
| return AE_OK; | ||
|
|
||
| if (!acpi_match_device_ids(acpi_dev, video_ids)) { | ||
| dev = acpi_get_physical_pci_device(handle); | ||
| if (!dev) | ||
| return AE_OK; | ||
| put_device(dev); | ||
| *cap |= acpi_is_video_device(acpi_dev); | ||
| } | ||
| return AE_OK; | ||
| } | ||
|
|
||
| /* | ||
| * Returns the video capabilities of a specific ACPI graphics device | ||
| * | ||
| * if NULL is passed as argument all ACPI devices are enumerated and | ||
| * all graphics capabilities of physically present devices are | ||
| * summerized and returned. This is cached and done only once. | ||
| */ | ||
| long acpi_video_get_capabilities(acpi_handle graphics_handle) | ||
| { | ||
| long caps = 0; | ||
| struct acpi_device *tmp_dev; | ||
| acpi_status status; | ||
|
|
||
| if (acpi_video_caps_checked && graphics_handle == NULL) | ||
| return acpi_video_support; | ||
|
|
||
| if (!graphics_handle) { | ||
| /* Only do the global walk through all graphics devices once */ | ||
| acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, | ||
| ACPI_UINT32_MAX, find_video, | ||
| &caps, NULL); | ||
| /* There might be boot param flags set already... */ | ||
| acpi_video_support |= caps; | ||
| acpi_video_caps_checked = 1; | ||
| /* Add blacklists here. Be careful to use the right *DMI* bits | ||
| * to still be able to override logic via boot params, e.g.: | ||
| * | ||
| * if (dmi_name_in_vendors("XY")) { | ||
| * acpi_video_support |= | ||
| * ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VENDOR; | ||
| * acpi_video_support |= | ||
| * ACPI_VIDEO_BACKLIGHT_DMI_VENDOR; | ||
| *} | ||
| */ | ||
| } else { | ||
| status = acpi_bus_get_device(graphics_handle, &tmp_dev); | ||
| if (ACPI_FAILURE(status)) { | ||
| ACPI_EXCEPTION((AE_INFO, status, "Invalid device")); | ||
| return 0; | ||
| } | ||
| acpi_walk_namespace(ACPI_TYPE_DEVICE, graphics_handle, | ||
| ACPI_UINT32_MAX, find_video, | ||
| &caps, NULL); | ||
| } | ||
| ACPI_DEBUG_PRINT((ACPI_DB_INFO, "We have 0x%lX video support %s %s\n", | ||
| graphics_handle ? caps : acpi_video_support, | ||
| graphics_handle ? "on device " : "in general", | ||
| graphics_handle ? acpi_device_bid(tmp_dev) : "")); | ||
| return caps; | ||
| } | ||
| EXPORT_SYMBOL(acpi_video_get_capabilities); | ||
|
|
||
| /* Returns true if video.ko can do backlight switching */ | ||
| int acpi_video_backlight_support(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) | ||
| acpi_video_get_capabilities(NULL); | ||
|
|
||
| /* First check for boot param -> highest prio */ | ||
| if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR) | ||
| return 0; | ||
| else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_FORCE_VIDEO) | ||
| return 1; | ||
|
|
||
| /* Then check for DMI blacklist -> second highest prio */ | ||
| if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VENDOR) | ||
| return 0; | ||
| else if (acpi_video_support & ACPI_VIDEO_BACKLIGHT_DMI_VIDEO) | ||
| return 1; | ||
|
|
||
| /* Then go the default way */ | ||
| return acpi_video_support & ACPI_VIDEO_BACKLIGHT; | ||
| } | ||
| EXPORT_SYMBOL(acpi_video_backlight_support); | ||
|
|
||
| /* | ||
| * Returns true if video.ko can do display output switching. | ||
| * This does not work well/at all with binary graphics drivers | ||
| * which disable system io ranges and do it on their own. | ||
| */ | ||
| int acpi_video_display_switch_support(void) | ||
| { | ||
| if (!acpi_video_caps_checked) | ||
| acpi_video_get_capabilities(NULL); | ||
|
|
||
| if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VENDOR) | ||
| return 0; | ||
| else if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VIDEO) | ||
| return 1; | ||
|
|
||
| if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VENDOR) | ||
| return 0; | ||
| else if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VIDEO) | ||
| return 1; | ||
|
|
||
| return acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING; | ||
| } | ||
| EXPORT_SYMBOL(acpi_video_display_switch_support); | ||
|
|
||
| /* | ||
| * Use acpi_display_output=vendor/video or acpi_backlight=vendor/video | ||
| * To force that backlight or display output switching is processed by vendor | ||
| * specific acpi drivers or video.ko driver. | ||
| */ | ||
| 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_OUTPUT_SWITCHING_FORCE_VIDEO; | ||
| } | ||
| return 1; | ||
| } | ||
| __setup("acpi_backlight=", acpi_backlight); | ||
|
|
||
| int __init acpi_display_output(char *str) | ||
| { | ||
| if (str == NULL || *str == '\0') | ||
| return 1; | ||
| else { | ||
| if (!strcmp("vendor", str)) | ||
| acpi_video_support |= | ||
| ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VENDOR; | ||
| if (!strcmp("video", str)) | ||
| acpi_video_support |= | ||
| ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VIDEO; | ||
| } | ||
| return 1; | ||
| } | ||
| __setup("acpi_display_output=", acpi_display_output); |
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