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+/*
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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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+ * May be copied or modified under the terms of the GNU General Public License
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+ *
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+ * video_detect.c:
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+ * Provides acpi_is_video_device() for early scanning of ACPI devices in scan.c
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+ * There a Linux specific (Spec does not provide a HID for video devices) is
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+ * assinged
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+ *
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+ * After PCI devices are glued with ACPI devices
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+ * acpi_get_physical_pci_device() 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 (or display output) 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_acpi,
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+ * sony_acpi,... can take care about backlight brightness and display output
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+ * switching.
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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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+ *
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+ */
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+
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+#include <linux/acpi.h>
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+#include <linux/dmi.h>
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+
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+ACPI_MODULE_NAME("video");
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+#define ACPI_VIDEO_COMPONENT 0x08000000
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+#define _COMPONENT ACPI_VIDEO_COMPONENT
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+
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+static long acpi_video_support;
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+static bool acpi_video_caps_checked;
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+
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+static acpi_status
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+acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
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+ void **retyurn_value)
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+{
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+ long *cap = context;
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+ acpi_handle h_dummy;
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+
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+ if (ACPI_SUCCESS(acpi_get_handle(handle, "_BCM", &h_dummy)) &&
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+ ACPI_SUCCESS(acpi_get_handle(handle, "_BCL", &h_dummy))) {
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+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
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+ "support\n"));
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+ *cap |= ACPI_VIDEO_BACKLIGHT;
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+ /* We have backlight support, no need to scan further */
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+ return AE_CTRL_TERMINATE;
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+ }
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+ return 0;
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+}
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+
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+/* Returns true if the device is a video device which can be handled by
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+ * video.ko.
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+ * The device will get a Linux specific CID added in scan.c to
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+ * identify the device as an ACPI graphics device
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+ * Be aware that the graphics device may not be physically present
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+ * Use acpi_video_get_capabilities() to detect general ACPI video
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+ * capabilities of present cards
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+ */
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+long acpi_is_video_device(struct acpi_device *device)
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+{
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+ acpi_handle h_dummy;
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+ long video_caps = 0;
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+
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+ if (!device)
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+ return 0;
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+
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+ /* Does this device able to support video switching ? */
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+ if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) &&
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+ ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
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+ video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
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+
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+ /* Does this device able to retrieve a video ROM ? */
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+ if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
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+ video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
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+
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+ /* Does this device able to configure which video head to be POSTed ? */
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+ if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) &&
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+ ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) &&
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+ ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy)))
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+ video_caps |= ACPI_VIDEO_DEVICE_POSTING;
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+
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+ /* Only check for backlight functionality if one of the above hit. */
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+ if (video_caps)
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+ acpi_walk_namespace(ACPI_TYPE_DEVICE, device->handle,
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+ ACPI_UINT32_MAX, acpi_backlight_cap_match,
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+ &video_caps, NULL);
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+
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+ return video_caps;
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+}
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+EXPORT_SYMBOL(acpi_is_video_device);
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+
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+static acpi_status
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+find_video(acpi_handle handle, u32 lvl, void *context, void **rv)
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+{
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+ long *cap = context;
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+ struct device *dev;
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+ struct acpi_device *acpi_dev;
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+
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+ const struct acpi_device_id video_ids[] = {
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+ {ACPI_VIDEO_HID, 0},
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+ {"", 0},
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+ };
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+ if (acpi_bus_get_device(handle, &acpi_dev))
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+ return AE_OK;
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+
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+ if (!acpi_match_device_ids(acpi_dev, video_ids)) {
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+ dev = acpi_get_physical_pci_device(handle);
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+ if (!dev)
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+ return AE_OK;
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+ put_device(dev);
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+ *cap |= acpi_is_video_device(acpi_dev);
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+ }
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+ return AE_OK;
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+}
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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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+ *
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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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+ * summerized and returned. This is cached and done only once.
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+ */
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+long acpi_video_get_capabilities(acpi_handle graphics_handle)
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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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+
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+ if (acpi_video_caps_checked && graphics_handle == NULL)
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+ return acpi_video_support;
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+
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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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+ acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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+ ACPI_UINT32_MAX, find_video,
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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_OUTPUT_SWITCHING_DMI_VENDOR;
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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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+ } 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,
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+ &caps, NULL);
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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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+EXPORT_SYMBOL(acpi_video_get_capabilities);
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+
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+/* Returns true if video.ko can do backlight switching */
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+int acpi_video_backlight_support(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_get_capabilities(NULL);
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+
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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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+
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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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+
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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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+EXPORT_SYMBOL(acpi_video_backlight_support);
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+
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+/*
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+ * Returns true if video.ko can do display output switching.
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+ * This does not work well/at all with binary graphics drivers
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+ * which disable system io ranges and do it on their own.
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+ */
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+int acpi_video_display_switch_support(void)
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+{
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+ if (!acpi_video_caps_checked)
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+ acpi_video_get_capabilities(NULL);
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+
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+ if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VENDOR)
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+ return 0;
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+ else if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VIDEO)
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+ return 1;
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+
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+ if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VENDOR)
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+ return 0;
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+ else if (acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING_DMI_VIDEO)
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+ return 1;
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+
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+ return acpi_video_support & ACPI_VIDEO_OUTPUT_SWITCHING;
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+}
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+EXPORT_SYMBOL(acpi_video_display_switch_support);
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+
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+/*
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+ * Use acpi_display_output=vendor/video or acpi_backlight=vendor/video
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+ * To force that backlight or display output switching is processed by vendor
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+ * specific acpi drivers or video.ko driver.
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+ */
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+int __init acpi_backlight(char *str)
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+{
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+ if (str == NULL || *str == '\0')
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+ return 1;
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+ else {
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+ if (!strcmp("vendor", str))
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+ acpi_video_support |=
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+ ACPI_VIDEO_BACKLIGHT_FORCE_VENDOR;
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+ if (!strcmp("video", str))
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+ acpi_video_support |=
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+ ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VIDEO;
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+ }
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+ return 1;
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+}
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+__setup("acpi_backlight=", acpi_backlight);
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+
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+int __init acpi_display_output(char *str)
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+{
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+ if (str == NULL || *str == '\0')
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+ return 1;
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+ else {
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+ if (!strcmp("vendor", str))
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+ acpi_video_support |=
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+ ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VENDOR;
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+ if (!strcmp("video", str))
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+ acpi_video_support |=
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+ ACPI_VIDEO_OUTPUT_SWITCHING_FORCE_VIDEO;
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+ }
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+ return 1;
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+}
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+__setup("acpi_display_output=", acpi_display_output);
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Thomas Renninger