litmus-rt.git - The LITMUS^RT kernel.

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Commits per author per week (path 'arch/arm/mach-shmobile/clock-r8a7791.c')

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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 * assigned * * After PCI devices are glued with ACPI devices * acpi_get_pci_dev() 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 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. * * 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> #include <linux/pci.h> #define PREFIX "ACPI: " ACPI_MODULE_NAME("video"); #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; if (ACPI_FAILURE(acpi_get_handle(handle, "_BQC", &h_dummy))) printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, " "cannot determine initial brightness\n"); /* 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; /* Is 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; /* Is 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; /* Is 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, NULL, &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 pci_dev *dev;


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