/* * video.c - ACPI Video Driver ($Revision:$) * * Copyright (C) 2004 Luming Yu * Copyright (C) 2004 Bruno Ducrot * Copyright (C) 2006 Thomas Tuttle * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define PREFIX "ACPI: " #define ACPI_VIDEO_BUS_NAME "Video Bus" #define ACPI_VIDEO_DEVICE_NAME "Video Device" #define ACPI_VIDEO_NOTIFY_SWITCH 0x80 #define ACPI_VIDEO_NOTIFY_PROBE 0x81 #define ACPI_VIDEO_NOTIFY_CYCLE 0x82 #define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83 #define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84 #define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85 #define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86 #define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87 #define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88 #define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89 #define MAX_NAME_LEN 20 #define _COMPONENT ACPI_VIDEO_COMPONENT ACPI_MODULE_NAME("video"); MODULE_AUTHOR("Bruno Ducrot"); MODULE_DESCRIPTION("ACPI Video Driver"); MODULE_LICENSE("GPL"); static bool brightness_switch_enabled = 1; module_param(brightness_switch_enabled, bool, 0644); /* * By default, we don't allow duplicate ACPI video bus devices * under the same VGA controller */ static bool allow_duplicates; module_param(allow_duplicates, bool, 0644); /* * Some BIOSes claim they use minimum backlight at boot, * and this may bring dimming screen after boot */ static bool use_bios_initial_backlight = 1; module_param(use_bios_initial_backlight, bool, 0644); static int register_count = 0; static int acpi_video_bus_add(struct acpi_device *device); static int acpi_video_bus_remove(struct acpi_device *device); static void acpi_video_bus_notify(struct acpi_device *device, u32 event); static const struct acpi_device_id video_device_ids[] = { {ACPI_VIDEO_HID, 0}, {"", 0}, }; MODULE_DEVICE_TABLE(acpi, video_device_ids); static struct acpi_driver acpi_video_bus = { .name = "video", .class = ACPI_VIDEO_CLASS, .ids = video_device_ids, .ops = { .add = acpi_video_bus_add, .remove = acpi_video_bus_remove, .notify = acpi_video_bus_notify, }, }; struct acpi_video_bus_flags { u8 multihead:1; /* can switch video heads */ u8 rom:1; /* can retrieve a video rom */ u8 post:1; /* can configure the head to */ u8 reserved:5; }; struct acpi_video_bus_cap { u8 _DOS:1; /*Enable/Disable output switching */ u8 _DOD:1; /*Enumerate all devices attached to display adapter */ u8 _ROM:1; /*Get ROM Data */ u8 _GPD:1; /*Get POST Device */ u8 _SPD:1; /*Set POST Device */ u8 _VPO:1; /*Video POST Options */ u8 reserved:2; }; struct acpi_video_device_attrib { u32 display_index:4; /* A zero-based instance of the Display */ u32 display_port_attachment:4; /*This field differentiates the display type */ u32 display_type:4; /*Describe the specific type in use */ u32 vendor_specific:4; /*Chipset Vendor Specific */ u32 bios_can_detect:1; /*BIOS can detect the device */ u32 depend_on_vga:1; /*Non-VGA output device whose power is related to the VGA device. */ u32 pipe_id:3; /*For VGA multiple-head devices. */ u32 reserved:10; /*Must be 0 */ u32 device_id_scheme:1; /*Device ID Scheme */ }; struct acpi_video_enumerated_device { union { u32 int_val; struct acpi_video_device_attrib attrib; } value; struct acpi_video_device *bind_info; }; struct acpi_video_bus { struct acpi_device *device; u8 dos_setting; struct acpi_video_enumerated_device *attached_array; u8 attached_count; struct acpi_video_bus_cap cap; struct acpi_video_bus_flags flags; struct list_head video_device_list; struct mutex device_list_lock; /* protects video_device_list */ struct input_dev *input; char phys[32]; /* for input device */ struct notifier_block pm_nb; }; struct acpi_video_device_flags { u8 crt:1; u8 lcd:1; u8 tvout:1; u8 dvi:1; u8 bios:1; u8 unknown:1; u8 notify:1; u8 reserved:1; }; struct acpi_video_device_cap { u8 _ADR:1; /*Return the unique ID */ u8 _BCL:1; /*Query list of brightness control levels supported */ u8 _BCM:1; /*Set the brightness level */ u8 _BQC:1; /* Get current brightness level */ u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */ u8 _DDC:1; /*Return the EDID for this device */ }; struct acpi_video_brightness_flags { u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */ u8 _BCL_reversed:1; /* _BCL package is in a reversed order*/ u8 _BCL_use_index:1; /* levels in _BCL are index values */ u8 _BCM_use_index:1; /* input of _BCM is an index value */ u8 _BQC_use_index:1; /* _BQC returns an index value */ }; struct acpi_video_device_brightness { int curr; int count; int *levels; struct acpi_video_brightness_flags flags; }; struct acpi_video_device { unsigned long device_id; struct acpi_video_device_flags flags; struct acpi_video_device_cap cap; struct list_head entry; struct acpi_video_bus *video; struct acpi_device *dev; struct acpi_video_device_brightness *brightness; struct backlight_device *backlight; struct thermal_cooling_device *cooling_dev; }; static const char device_decode[][30] = { "motherboard VGA device", "PCI VGA device", "AGP VGA device", "UNKNOWN", }; static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data); static void acpi_video_device_rebind(struct acpi_video_bus *video); static void acpi_video_device_bind(struct acpi_video_bus *video, struct acpi_video_device *device); static int acpi_video_device_enumerate(struct acpi_video_bus *video); static int acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level); static int acpi_video_device_lcd_get_level_current( struct acpi_video_device *device, unsigned long long *level, bool raw); static int acpi_video_get_next_level(struct acpi_video_device *device, u32 level_current, u32 event); static int acpi_video_switch_brightness(struct acpi_video_device *device, int event); /*backlight device sysfs support*/ static int acpi_video_get_brightness(struct backlight_device *bd) { unsigned long long cur_level; int i; struct acpi_video_device *vd = (struct acpi_video_device *)bl_get_data(bd); if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false)) return -EINVAL; for (i = 2; i < vd->brightness->count; i++) { if (vd->brightness->levels[i] == cur_level) /* The first two entries are special - see page 575 of the ACPI spec 3.0 */ return i-2; } return 0; } static int acpi_video_set_brightness(struct backlight_device *bd) { int request_level = bd->props.brightness + 2; struct acpi_video_device *vd = (struct acpi_video_device *)bl_get_data(bd); return acpi_video_device_lcd_set_level(vd, vd->brightness->levels[request_level]); } static const struct backlight_ops acpi_backlight_ops = { .get_brightness = acpi_video_get_brightness, .update_status = acpi_video_set_brightness, }; /* thermal cooling device callbacks */ static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned long *state) { struct acpi_device *device = cooling_dev->devdata; struct acpi_video_device *video = acpi_driver_data(device); *state = video->brightness->count - 3; return 0; } static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long *state) { struct acpi_device *device = cooling_dev->devdata; struct acpi_video_device *video = acpi_driver_data(device); unsigned long long level; int offset; if (acpi_video_device_lcd_get_level_current(video, &level, false)) return -EINVAL; for (offset = 2; offset < video->brightness->count; offset++) if (level == video->brightness->levels[offset]) { *state = video->brightness->count - offset - 1; return 0; } return -EINVAL; } static int video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state) { struct acpi_device *device = cooling_dev->devdata; struct acpi_video_device *video = acpi_driver_data(device); int level; if ( state >= video->brightness->count - 2) return -EINVAL; state = video->brightness->count - state; level = video->brightness->levels[state -1]; return acpi_video_device_lcd_set_level(video, level); } static const struct thermal_cooling_device_ops video_cooling_ops = { .get_max_state = video_get_max_state, .get_cur_state = video_get_cur_state, .set_cur_state = video_set_cur_state, }; /* -------------------------------------------------------------------------- Video Management -------------------------------------------------------------------------- */ static int acpi_video_device_lcd_query_levels(struct acpi_video_device *device, union acpi_object **levels) { int status; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *obj; *levels = NULL; status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer); if (!ACPI_SUCCESS(status)) return status; obj = (union acpi_object *)buffer.pointer; if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { printk(KERN_ERR PREFIX "Invalid _BCL data\n"); status = -EFAULT; goto err; } *levels = obj; return 0; err: kfree(buffer.pointer); return status; } static int acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level) { int status; union acpi_object arg0 = { ACPI_TYPE_INTEGER }; struct acpi_object_list args = { 1, &arg0 }; int state; arg0.integer.value = level; status = acpi_evaluate_object(device->dev->handle, "_BCM", &args, NULL); if (ACPI_FAILURE(status)) { ACPI_ERROR((AE_INFO, "Evaluating _BCM failed")); return -EIO; } device->brightness->curr = level; for (state = 2; state < device->brightness->count; state++) if (level == device->brightness->levels[state]) { if (device->backlight) device->backlight->props.brightness = state - 2; return 0; } ACPI_ERROR((AE_INFO, "Current brightness invalid")); return -EINVAL; } /* * For some buggy _BQC methods, we need to add a constant value to * the _BQC return value to get the actual current brightness level */ static int bqc_offset_aml_bug_workaround; static int __init video_set_bqc_offset(const struct dmi_system_id *d) { bqc_offset_aml_bug_workaround = 9; return 0; } static int video_ignore_initial_backlight(const struct dmi_system_id *d) { use_bios_initial_backlight = 0; return 0; } static struct dmi_system_id video_dmi_table[] __initdata = { /* * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121 */ { .callback = video_set_bqc_offset, .ident = "Acer Aspire 5720", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"), }, }, { .callback = video_set_bqc_offset, .ident = "Acer Aspire 5710Z", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"), }, }, { .callback = video_set_bqc_offset, .ident = "eMachines E510", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"), DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"), }, }, { .callback = video_set_bqc_offset, .ident = "Acer Aspire 5315", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"), }, }, { .callback = video_set_bqc_offset, .ident = "Acer Aspire 7720", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"), }, }, { .callback = video_ignore_initial_backlight, .ident = "HP Folio 13-2000", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"), DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13 - 2000 Notebook PC"), }, }, { .callback = video_ignore_initial_backlight, .ident = "HP Pavilion dm4", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"), DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion dm4 Notebook PC"), }, }, { .callback = video_ignore_initial_backlight, .ident = "HP Pavilion g6 Notebook PC", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"), DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion g6 Notebook PC"), }, }, { .callback = video_ignore_initial_backlight, .ident = "HP 1000 Notebook PC", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"), DMI_MATCH(DMI_PRODUCT_NAME, "HP 1000 Notebook PC"), }, }, { .callback = video_ignore_initial_backlight, .ident = "HP Pavilion m4", .matches = { DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"), DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion m4 Notebook PC"), }, }, {} }; static unsigned long long acpi_video_bqc_value_to_level(struct acpi_video_device *device, unsigned long long bqc_value) { unsigned long long level; if (device->brightness->flags._BQC_use_index) { /* * _BQC returns an index that doesn't account for * the first 2 items with special meaning, so we need * to compensate for that by offsetting ourselves */ if (device->brightness->flags._BCL_reversed) bqc_value = device->brightness->count - 3 - bqc_value; level = device->brightness->levels[bqc_value + 2]; } else { level = bqc_value; } level += bqc_offset_aml_bug_workaround; return level; } static int acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, unsigned long long *level, bool raw) { acpi_status status = AE_OK; int i; if (device->cap._BQC || device->cap._BCQ) { char *buf = device->cap._BQC ? "_BQC" : "_BCQ"; status = acpi_evaluate_integer(device->dev->handle, buf, NULL, level); if (ACPI_SUCCESS(status)) { if (raw) { /* * Caller has indicated he wants the raw * value returned by _BQC, so don't furtherly * mess with the value. */ return 0; } *level = acpi_video_bqc_value_to_level(device, *level); for (i = 2; i < device->brightness->count; i++) if (device->brightness->levels[i] == *level) { device->brightness->curr = *level; return 0; } /* * BQC returned an invalid level. * Stop using it. */ ACPI_WARNING((AE_INFO, "%s returned an invalid level", buf)); device->cap._BQC = device->cap._BCQ = 0; } else { /* Fixme: * should we return an error or ignore this failure? * dev->brightness->curr is a cached value which stores * the correct current backlight level in most cases. * ACPI video backlight still works w/ buggy _BQC. * http://bugzilla.kernel.org/show_bug.cgi?id=12233 */ ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf)); device->cap._BQC = device->cap._BCQ = 0; } } *level = device->brightness->curr; return 0; } static int acpi_video_device_EDID(struct acpi_video_device *device, union acpi_object **edid, ssize_t length) { int status; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *obj; union acpi_object arg0 = { ACPI_TYPE_INTEGER }; struct acpi_object_list args = { 1, &arg0 }; *edid = NULL; if (!device) return -ENODEV; if (length == 128) arg0.integer.value = 1; else if (length == 256) arg0.integer.value = 2; else return -EINVAL; status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer); if (ACPI_FAILURE(status)) return -ENODEV; obj = buffer.pointer; if (obj && obj->type == ACPI_TYPE_BUFFER) *edid = obj; else { printk(KERN_ERR PREFIX "Invalid _DDC data\n"); status = -EFAULT; kfree(obj); } return status; } /* bus */ /* * Arg: * video : video bus device pointer * bios_flag : * 0. The system BIOS should NOT automatically switch(toggle) * the active display output. * 1. The system BIOS should automatically switch (toggle) the * active display output. No switch event. * 2. The _DGS value should be locked. * 3. The system BIOS should not automatically switch (toggle) the * active display output, but instead generate the display switch * event notify code. * lcd_flag : * 0. The system BIOS should automatically control the brightness level * of the LCD when the power changes from AC to DC * 1. The system BIOS should NOT automatically control the brightness * level of the LCD when the power changes from AC to DC. * Return Value: * -EINVAL wrong arg. */ static int acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) { acpi_status status; union acpi_object arg0 = { ACPI_TYPE_INTEGER }; struct acpi_object_list args = { 1, &arg0 }; if (!video->cap._DOS) return 0; if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) return -EINVAL; arg0.integer.value = (lcd_flag << 2) | bios_flag; video->dos_setting = arg0.integer.value; status = acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL); if (ACPI_FAILURE(status)) return -EIO; return 0; } /* * Simple comparison function used to sort backlight levels. */ static int acpi_video_cmp_level(const void *a, const void *b) { return *(int *)a - *(int *)b; } /* * Decides if _BQC/_BCQ for this system is usable * * We do this by changing the level first and then read out the current * brightness level, if the value does not match, find out if it is using * index. If not, clear the _BQC/_BCQ capability. */ static int acpi_video_bqc_quirk(struct acpi_video_device *device, int max_level, int current_level) { struct acpi_video_device_brightness *br = device->brightness; int result; unsigned long long level; int test_level; /* don't mess with existing known broken systems */ if (bqc_offset_aml_bug_workaround) return 0; /* * Some systems always report current brightness level as maximum * through _BQC, we need to test another value for them. */ test_level = current_level == max_level ? br->levels[2] : max_level; result = acpi_video_device_lcd_set_level(device, test_level); if (result) return result; result = acpi_video_device_lcd_get_level_current(device, &level, true); if (result) return result; if (level != test_level) { /* buggy _BQC found, need to find out if it uses index */ if (level < br->count) { if (br->flags._BCL_reversed) level = br->count - 3 - level; if (br->levels[level + 2] == test_level) br->flags._BQC_use_index = 1; } if (!br->flags._BQC_use_index) device->cap._BQC = device->cap._BCQ = 0; } return 0; } /* * Arg: * device : video output device (LCD, CRT, ..) * * Return Value: * Maximum brightness level * * Allocate and initialize device->brightness. */ static int acpi_video_init_brightness(struct acpi_video_device *device) { union acpi_object *obj = NULL; int i, max_level = 0, count = 0, level_ac_battery = 0; unsigned long long level, level_old; union acpi_object *o; struct acpi_video_device_brightness *br = NULL; int result = -EINVAL; if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available " "LCD brightness level\n")); goto out; } if (obj->package.count < 2) goto out; br = kzalloc(sizeof(*br), GFP_KERNEL); if (!br) { printk(KERN_ERR "can't allocate memory\n"); result = -ENOMEM; goto out; } br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels), GFP_KERNEL); if (!br->levels) { result = -ENOMEM; goto out_free; } for (i = 0; i < obj->package.count; i++) { o = (union acpi_object *)&obj->package.elements[i]; if (o->type != ACPI_TYPE_INTEGER) { printk(KERN_ERR PREFIX "Invalid data\n"); continue; } br->levels[count] = (u32) o->integer.value; if (br->levels[count] > max_level) max_level = br->levels[count]; count++; } /* * some buggy BIOS don't export the levels * when machine is on AC/Battery in _BCL package. * In this case, the first two elements in _BCL packages * are also supported brightness levels that OS should take care of. */ for (i = 2; i < count; i++) { if (br->levels[i] == br->levels[0]) level_ac_battery++; if (br->levels[i] == br->levels[1]) level_ac_battery++; } if (level_ac_battery < 2) { level_ac_battery = 2 - level_ac_battery; br->flags._BCL_no_ac_battery_levels = 1; for (i = (count - 1 + level_ac_battery); i >= 2; i--) br->levels[i] = br->levels[i - level_ac_battery]; count += level_ac_battery; } else if (level_ac_battery > 2) ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package")); /* Check if the _BCL package is in a reversed order */ if (max_level == br->levels[2]) { br->flags._BCL_reversed = 1; sort(&br->levels[2], count - 2, sizeof(br->levels[2]), acpi_video_cmp_level, NULL); } else if (max_level != br->levels[count - 1]) ACPI_ERROR((AE_INFO, "Found unordered _BCL package")); br->count = count; device->brightness = br; /* Check the input/output of _BQC/_BCL/_BCM */ if ((max_level < 100) && (max_level <= (count - 2))) br->flags._BCL_use_index = 1; /* * _BCM is always consistent with _BCL, * at least for all the laptops we have ever seen. */ br->flags._BCM_use_index = br->flags._BCL_use_index; /* _BQC uses INDEX while _BCL uses VALUE in some laptops */ br->curr = level = max_level; if (!device->cap._BQC) goto set_level; result = acpi_video_device_lcd_get_level_current(device, &level_old, true); if (result) goto out_free_levels; result = acpi_video_bqc_quirk(device, max_level, level_old); if (result) goto out_free_levels; /* * cap._BQC may get cleared due to _BQC is found to be broken * in acpi_video_bqc_quirk, so check again here. */ if (!device->cap._BQC) goto set_level; if (use_bios_initial_backlight) { level = acpi_video_bqc_value_to_level(device, level_old); /* * On some buggy laptops, _BQC returns an uninitialized * value when invoked for the first time, i.e. * level_old is invalid (no matter whether it's a level * or an index). Set the backlight to max_level in this case. */ for (i = 2; i < br->count; i++) if (level_old == br->levels[i]) break; if (i == br->count) level = max_level; } set_level: result = acpi_video_device_lcd_set_level(device, level); if (result) goto out_free_levels; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "found %d brightness levels\n", count - 2)); kfree(obj); return result; out_free_levels: kfree(br->levels); out_free: kfree(br); out: device->brightness = NULL; kfree(obj); return result; } /* * Arg: * device : video output device (LCD, CRT, ..) * * Return Value: * None * * Find out all required AML methods defined under the output * device. */ static void acpi_video_device_find_cap(struct acpi_video_device *device) { acpi_handle h_dummy1; if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) { device->cap._ADR = 1; } if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) { device->cap._BCL = 1; } if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) { device->cap._BCM = 1; } if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1))) device->cap._BQC = 1; else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ", &h_dummy1))) { printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n"); device->cap._BCQ = 1; } if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) { device->cap._DDC = 1; } if (acpi_video_backlight_support()) { struct backlight_properties props; struct pci_dev *pdev; acpi_handle acpi_parent; struct device *parent = NULL; int result; static int count = 0; char *name; result = acpi_video_init_brightness(device); if (result) return; name = kasprintf(GFP_KERNEL, "acpi_video%d", count); if (!name) return; count++; acpi_get_parent(device->dev->handle, &acpi_parent); pdev = acpi_get_pci_dev(acpi_parent); if (pdev) { parent = &pdev->dev; pci_dev_put(pdev); } memset(&props, 0, sizeof(struct backlight_properties)); props.type = BACKLIGHT_FIRMWARE; props.max_brightness = device->brightness->count - 3; device->backlight = backlight_device_register(name, parent, device, &acpi_backlight_ops, &props); kfree(name); if (IS_ERR(device->backlight)) return; /* * Save current brightness level in case we have to restore it * before acpi_video_device_lcd_set_level() is called next time. */ device->backlight->props.brightness = acpi_video_get_brightness(device->backlight); device->cooling_dev = thermal_cooling_device_register("LCD", device->dev, &video_cooling_ops); if (IS_ERR(device->cooling_dev)) { /* * Set cooling_dev to NULL so we don't crash trying to * free it. * Also, why the hell we are returning early and * not attempt to register video output if cooling * device registration failed? * -- dtor */ device->cooling_dev = NULL; return; } dev_info(&device->dev->dev, "registered as cooling_device%d\n", device->cooling_dev->id); result = sysfs_create_link(&device->dev->dev.kobj, &device->cooling_dev->device.kobj, "thermal_cooling"); if (result) printk(KERN_ERR PREFIX "Create sysfs link\n"); result = sysfs_create_link(&device->cooling_dev->device.kobj, &device->dev->dev.kobj, "device"); if (result) printk(KERN_ERR PREFIX "Create sysfs link\n"); } } /* * Arg: * device : video output device (VGA) * * Return Value: * None * * Find out all required AML methods defined under the video bus device. */ static void acpi_video_bus_find_cap(struct acpi_video_bus *video) { acpi_handle h_dummy1; if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) { video->cap._DOS = 1; } if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) { video->cap._DOD = 1; } if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) { video->cap._ROM = 1; } if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) { video->cap._GPD = 1; } if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) { video->cap._SPD = 1; } if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) { video->cap._VPO = 1; } } /* * Check whether the video bus device has required AML method to * support the desired features */ static int acpi_video_bus_check(struct acpi_video_bus *video) { acpi_status status = -ENOENT; struct pci_dev *dev; if (!video) return -EINVAL; dev = acpi_get_pci_dev(video->device->handle); if (!dev) return -ENODEV; pci_dev_put(dev); /* Since there is no HID, CID and so on for VGA driver, we have * to check well known required nodes. */ /* Does this device support video switching? */ if (video->cap._DOS || video->cap._DOD) { if (!video->cap._DOS) { printk(KERN_WARNING FW_BUG "ACPI(%s) defines _DOD but not _DOS\n", acpi_device_bid(video->device)); } video->flags.multihead = 1; status = 0; } /* Does this device support retrieving a video ROM? */ if (video->cap._ROM) { video->flags.rom = 1; status = 0; } /* Does this device support configuring which video device to POST? */ if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { video->flags.post = 1; status = 0; } return status; } /* -------------------------------------------------------------------------- Driver Interface -------------------------------------------------------------------------- */ /* device interface */ static struct acpi_video_device_attrib* acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) { struct acpi_video_enumerated_device *ids; int i; for (i = 0; i < video->attached_count; i++) { ids = &video->attached_array[i]; if ((ids->value.int_val & 0xffff) == device_id) return &ids->value.attrib; } return NULL; } static int acpi_video_get_device_type(struct acpi_video_bus *video, unsigned long device_id) { struct acpi_video_enumerated_device *ids; int i; for (i = 0; i < video->attached_count; i++) { ids = &video->attached_array[i]; if ((ids->value.int_val & 0xffff) == device_id) return ids->value.int_val; } return 0; } static int acpi_video_bus_get_one_device(struct acpi_device *device, struct acpi_video_bus *video) { unsigned long long device_id; int status, device_type; struct acpi_video_device *data; struct acpi_video_device_attrib* attribute; status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); /* Some device omits _ADR, we skip them instead of fail */ if (ACPI_FAILURE(status)) return 0; data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); if (!data) return -ENOMEM; strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); device->driver_data = data; data->device_id = device_id; data->video = video; data->dev = device; attribute = acpi_video_get_device_attr(video, device_id); if((attribute != NULL) && attribute->device_id_scheme) { switch (attribute->display_type) { case ACPI_VIDEO_DISPLAY_CRT: data->flags.crt = 1; break; case ACPI_VIDEO_DISPLAY_TV: data->flags.tvout = 1; break; case ACPI_VIDEO_DISPLAY_DVI: data->flags.dvi = 1; break; case ACPI_VIDEO_DISPLAY_LCD: data->flags.lcd = 1; break; default: data->flags.unknown = 1; break; } if(attribute->bios_can_detect) data->flags.bios = 1; } else { /* Check for legacy IDs */ device_type = acpi_video_get_device_type(video, device_id); /* Ignore bits 16 and 18-20 */ switch (device_type & 0xffe2ffff) { case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: data->flags.crt = 1; break; case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: data->flags.lcd = 1; break; case ACPI_VIDEO_DISPLAY_LEGACY_TV: data->flags.tvout = 1; break; default: data->flags.unknown = 1; } } acpi_video_device_bind(video, data); acpi_video_device_find_cap(data); status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, acpi_video_device_notify, data); if (ACPI_FAILURE(status)) dev_err(&device->dev, "Error installing notify handler\n"); else data->flags.notify = 1; mutex_lock(&video->device_list_lock); list_add_tail(&data->entry, &video->video_device_list); mutex_unlock(&video->device_list_lock); return status; } /* * Arg: * video : video bus device * * Return: * none * * Enumerate the video device list of the video bus, * bind the ids with the corresponding video devices * under the video bus. */ static void acpi_video_device_rebind(struct acpi_video_bus *video) { struct acpi_video_device *dev; mutex_lock(&video->device_list_lock); list_for_each_entry(dev, &video->video_device_list, entry) acpi_video_device_bind(video, dev); mutex_unlock(&video->device_list_lock); } /* * Arg: * video : video bus device * device : video output device under the video * bus * * Return: * none * * Bind the ids with the corresponding video devices * under the video bus. */ static void acpi_video_device_bind(struct acpi_video_bus *video, struct acpi_video_device *device) { struct acpi_video_enumerated_device *ids; int i; for (i = 0; i < video->attached_count; i++) { ids = &video->attached_array[i]; if (device->device_id == (ids->value.int_val & 0xffff)) { ids->bind_info = device; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i)); } } } /* * Arg: * video : video bus device * * Return: * < 0 : error * * Call _DOD to enumerate all devices attached to display adapter * */ static int acpi_video_device_enumerate(struct acpi_video_bus *video) { int status; int count; int i; struct acpi_video_enumerated_device *active_list; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *dod = NULL; union acpi_object *obj; status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); if (!ACPI_SUCCESS(status)) { ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD")); return status; } dod = buffer.pointer; if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data")); status = -EFAULT; goto out; } ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n", dod->package.count)); active_list = kcalloc(1 + dod->package.count, sizeof(struct acpi_video_enumerated_device), GFP_KERNEL); if (!active_list) { status = -ENOMEM; goto out; } count = 0; for (i = 0; i < dod->package.count; i++) { obj = &dod->package.elements[i]; if (obj->type != ACPI_TYPE_INTEGER) { printk(KERN_ERR PREFIX "Invalid _DOD data in element %d\n", i); continue; } active_list[count].value.int_val = obj->integer.value; active_list[count].bind_info = NULL; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i, (int)obj->integer.value)); count++; } kfree(video->attached_array); video->attached_array = active_list; video->attached_count = count; out: kfree(buffer.pointer); return status; } static int acpi_video_get_next_level(struct acpi_video_device *device, u32 level_current, u32 event) { int min, max, min_above, max_below, i, l, delta = 255; max = max_below = 0; min = min_above = 255; /* Find closest level to level_current */ for (i = 2; i < device->brightness->count; i++) { l = device->brightness->levels[i]; if (abs(l - level_current) < abs(delta)) { delta = l - level_current; if (!delta) break; } } /* Ajust level_current to closest available level */ level_current += delta; for (i = 2; i < device->brightness->count; i++) { l = device->brightness->levels[i]; if (l < min) min = l; if (l > max) max = l; if (l < min_above && l > level_current) min_above = l; if (l > max_below && l < level_current) max_below = l; } switch (event) { case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: return (level_current < max) ? min_above : min; case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: return (level_current < max) ? min_above : max; case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: return (level_current > min) ? max_below : min; case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: return 0; default: return level_current; } } static int acpi_video_switch_brightness(struct acpi_video_device *device, int event) { unsigned long long level_current, level_next; int result = -EINVAL; /* no warning message if acpi_backlight=vendor is used */ if (!acpi_video_backlight_support()) return 0; if (!device->brightness) goto out; result = acpi_video_device_lcd_get_level_current(device, &level_current, false); if (result) goto out; level_next = acpi_video_get_next_level(device, level_current, event); result = acpi_video_device_lcd_set_level(device, level_next); if (!result) backlight_force_update(device->backlight, BACKLIGHT_UPDATE_HOTKEY); out: if (result) printk(KERN_ERR PREFIX "Failed to switch the brightness\n"); return result; } int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, void **edid) { struct acpi_video_bus *video; struct acpi_video_device *video_device; union acpi_object *buffer = NULL; acpi_status status; int i, length; if (!device || !acpi_driver_data(device)) return -EINVAL; video = acpi_driver_data(device); for (i = 0; i < video->attached_count; i++) { video_device = video->attached_array[i].bind_info; length = 256; if (!video_device) continue; if (!video_device->cap._DDC) continue; if (type) { switch (type) { case ACPI_VIDEO_DISPLAY_CRT: if (!video_device->flags.crt) continue; break; case ACPI_VIDEO_DISPLAY_TV: if (!video_device->flags.tvout) continue; break; case ACPI_VIDEO_DISPLAY_DVI: if (!video_device->flags.dvi) continue; break; case ACPI_VIDEO_DISPLAY_LCD: if (!video_device->flags.lcd) continue; break; } } else if (video_device->device_id != device_id) { continue; } status = acpi_video_device_EDID(video_device, &buffer, length); if (ACPI_FAILURE(status) || !buffer || buffer->type != ACPI_TYPE_BUFFER) { length = 128; status = acpi_video_device_EDID(video_device, &buffer, length); if (ACPI_FAILURE(status) || !buffer || buffer->type != ACPI_TYPE_BUFFER) { continue; } } *edid = buffer->buffer.pointer; return length; } return -ENODEV; } EXPORT_SYMBOL(acpi_video_get_edid); static int acpi_video_bus_get_devices(struct acpi_video_bus *video, struct acpi_device *device) { int status = 0; struct acpi_device *dev; /* * There are systems where video module known to work fine regardless * of broken _DOD and ignoring returned value here doesn't cause * any issues later. */ acpi_video_device_enumerate(video); list_for_each_entry(dev, &device->children, node) { status = acpi_video_bus_get_one_device(dev, video); if (status) { dev_err(&dev->dev, "Can't attach device\n"); break; } } return status; } static int acpi_video_bus_put_one_device(struct acpi_video_device *device) { acpi_status status; if (!device || !device->video) return -ENOENT; if (device->flags.notify) { status = acpi_remove_notify_handler(device->dev->handle, ACPI_DEVICE_NOTIFY, acpi_video_device_notify); if (ACPI_FAILURE(status)) dev_err(&device->dev->dev, "Can't remove video notify handler\n"); } if (device->backlight) { backlight_device_unregister(device->backlight); device->backlight = NULL; } if (device->cooling_dev) { sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); thermal_cooling_device_unregister(device->cooling_dev); device->cooling_dev = NULL; } return 0; } static int acpi_video_bus_put_devices(struct acpi_video_bus *video) { int status; struct acpi_video_device *dev, *next; mutex_lock(&video->device_list_lock); list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { status = acpi_video_bus_put_one_device(dev); if (ACPI_FAILURE(status)) printk(KERN_WARNING PREFIX "hhuuhhuu bug in acpi video driver.\n"); if (dev->brightness) { kfree(dev->brightness->levels); kfree(dev->brightness); } list_del(&dev->entry); kfree(dev); } mutex_unlock(&video->device_list_lock); return 0; } /* acpi_video interface */ static int acpi_video_bus_start_devices(struct acpi_video_bus *video) { return acpi_video_bus_DOS(video, 0, 0); } static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) { return acpi_video_bus_DOS(video, 0, 1); } static void acpi_video_bus_notify(struct acpi_device *device, u32 event) { struct acpi_video_bus *video = acpi_driver_data(device); struct input_dev *input; int keycode = 0; if (!video) return; input = video->input; switch (event) { case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, * most likely via hotkey. */ acpi_bus_generate_proc_event(device, event, 0); keycode = KEY_SWITCHVIDEOMODE; break; case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video * connector. */ acpi_video_device_enumerate(video); acpi_video_device_rebind(video); acpi_bus_generate_proc_event(device, event, 0); keycode = KEY_SWITCHVIDEOMODE; break; case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ acpi_bus_generate_proc_event(device, event, 0); keycode = KEY_SWITCHVIDEOMODE; break; case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ acpi_bus_generate_proc_event(device, event, 0); keycode = KEY_VIDEO_NEXT; break; case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ acpi_bus_generate_proc_event(device, event, 0); keycode = KEY_VIDEO_PREV; break; default: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unsupported event [0x%x]\n", event)); break; } if (acpi_notifier_call_chain(device, event, 0)) /* Something vetoed the keypress. */ keycode = 0; if (keycode) { input_report_key(input, keycode, 1); input_sync(input); input_report_key(input, keycode, 0); input_sync(input); } return; } static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) { struct acpi_video_device *video_device = data; struct acpi_device *device = NULL; struct acpi_video_bus *bus; struct input_dev *input; int keycode = 0; if (!video_device) return; device = video_device->dev; bus = video_device->video; input = bus->input; switch (event) { case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ if (brightness_switch_enabled) acpi_video_switch_brightness(video_device, event); acpi_bus_generate_proc_event(device, event, 0); keycode = KEY_BRIGHTNESS_CYCLE; break; case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ if (brightness_switch_enabled) acpi_video_switch_brightness(video_device, event); acpi_bus_generate_proc_event(device, event, 0); keycode = KEY_BRIGHTNESSUP; break; case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ if (brightness_switch_enabled) acpi_video_switch_brightness(video_device, event); acpi_bus_generate_proc_event(device, event, 0); keycode = KEY_BRIGHTNESSDOWN; break; case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ if (brightness_switch_enabled) acpi_video_switch_brightness(video_device, event); acpi_bus_generate_proc_event(device, event, 0); keycode = KEY_BRIGHTNESS_ZERO; break; case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ if (brightness_switch_enabled) acpi_video_switch_brightness(video_device, event); acpi_bus_generate_proc_event(device, event, 0); keycode = KEY_DISPLAY_OFF; break; default: ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unsupported event [0x%x]\n", event)); break; } acpi_notifier_call_chain(device, event, 0); if (keycode) { input_report_key(input, keycode, 1); input_sync(input); input_report_key(input, keycode, 0); input_sync(input); } return; } static int acpi_video_resume(struct notifier_block *nb, unsigned long val, void *ign) { struct acpi_video_bus *video; struct acpi_video_device *video_device; int i; switch (val) { case PM_HIBERNATION_PREPARE: case PM_SUSPEND_PREPARE: case PM_RESTORE_PREPARE: return NOTIFY_DONE; } video = container_of(nb, struct acpi_video_bus, pm_nb); dev_info(&video->device->dev, "Restoring backlight state\n"); for (i = 0; i < video->attached_count; i++) { video_device = video->attached_array[i].bind_info; if (video_device && video_device->backlight) acpi_video_set_brightness(video_device->backlight); } return NOTIFY_OK; } static acpi_status acpi_video_bus_match(acpi_handle handle, u32 level, void *context, void **return_value) { struct acpi_device *device = context; struct acpi_device *sibling; int result; if (handle == device->handle) return AE_CTRL_TERMINATE; result = acpi_bus_get_device(handle, &sibling); if (result) return AE_OK; if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) return AE_ALREADY_EXISTS; return AE_OK; } static int instance; static int acpi_video_bus_add(struct acpi_device *device) { struct acpi_video_bus *video; struct input_dev *input; int error; acpi_status status; if (device->handler) return -EINVAL; status = acpi_walk_namespace(ACPI_TYPE_DEVICE, device->parent->handle, 1, acpi_video_bus_match, NULL, device, NULL); if (status == AE_ALREADY_EXISTS) { printk(KERN_WARNING FW_BUG "Duplicate ACPI video bus devices for the" " same VGA controller, please try module " "parameter \"video.allow_duplicates=1\"" "if the current driver doesn't work.\n"); if (!allow_duplicates) return -ENODEV; } video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); if (!video) return -ENOMEM; /* a hack to fix the duplicate name "VID" problem on T61 */ if (!strcmp(device->pnp.bus_id, "VID")) { if (instance) device->pnp.bus_id[3] = '0' + instance; instance ++; } /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ if (!strcmp(device->pnp.bus_id, "VGA")) { if (instance) device->pnp.bus_id[3] = '0' + instance; instance++; } video->device = device; strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); device->driver_data = video; acpi_video_bus_find_cap(video); error = acpi_video_bus_check(video); if (error) goto err_free_video; mutex_init(&video->device_list_lock); INIT_LIST_HEAD(&video->video_device_list); error = acpi_video_bus_get_devices(video, device); if (error) goto err_put_video; video->input = input = input_allocate_device(); if (!input) { error = -ENOMEM; goto err_put_video; } error = acpi_video_bus_start_devices(video); if (error) goto err_free_input_dev; snprintf(video->phys, sizeof(video->phys), "%s/video/input0", acpi_device_hid(video->device)); input->name = acpi_device_name(video->device); input->phys = video->phys; input->id.bustype = BUS_HOST; input->id.product = 0x06; input->dev.parent = &device->dev; input->evbit[0] = BIT(EV_KEY); set_bit(KEY_SWITCHVIDEOMODE, input->keybit); set_bit(KEY_VIDEO_NEXT, input->keybit); set_bit(KEY_VIDEO_PREV, input->keybit); set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); set_bit(KEY_BRIGHTNESSUP, input->keybit); set_bit(KEY_BRIGHTNESSDOWN, input->keybit); set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); set_bit(KEY_DISPLAY_OFF, input->keybit); printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n", ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), video->flags.multihead ? "yes" : "no", video->flags.rom ? "yes" : "no", video->flags.post ? "yes" : "no"); video->pm_nb.notifier_call = acpi_video_resume; video->pm_nb.priority = 0; error = register_pm_notifier(&video->pm_nb); if (error) goto err_stop_video; error = input_register_device(input); if (error) goto err_unregister_pm_notifier; return 0; err_unregister_pm_notifier: unregister_pm_notifier(&video->pm_nb); err_stop_video: acpi_video_bus_stop_devices(video); err_free_input_dev: input_free_device(input); err_put_video: acpi_video_bus_put_devices(video); kfree(video->attached_array); err_free_video: kfree(video); device->driver_data = NULL; return error; } static int acpi_video_bus_remove(struct acpi_device *device) { struct acpi_video_bus *video = NULL; if (!device || !acpi_driver_data(device)) return -EINVAL; video = acpi_driver_data(device); unregister_pm_notifier(&video->pm_nb); acpi_video_bus_stop_devices(video); acpi_video_bus_put_devices(video); input_unregister_device(video->input); kfree(video->attached_array); kfree(video); return 0; } static int __init is_i740(struct pci_dev *dev) { if (dev->device == 0x00D1) return 1; if (dev->device == 0x7000) return 1; return 0; } static int __init intel_opregion_present(void) { int opregion = 0; struct pci_dev *dev = NULL; u32 address; for_each_pci_dev(dev) { if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) continue; if (dev->vendor != PCI_VENDOR_ID_INTEL) continue; /* We don't want to poke around undefined i740 registers */ if (is_i740(dev)) continue; pci_read_config_dword(dev, 0xfc, &address); if (!address) continue; opregion = 1; } return opregion; } int acpi_video_register(void) { int result = 0; if (register_count) { /* * if the function of acpi_video_register is already called, * don't register the acpi_vide_bus again and return no error. */ return 0; } result = acpi_bus_register_driver(&acpi_video_bus); if (result < 0) return -ENODEV; /* * When the acpi_video_bus is loaded successfully, increase * the counter reference. */ register_count = 1; return 0; } EXPORT_SYMBOL(acpi_video_register); void acpi_video_unregister(void) { if (!register_count) { /* * If the acpi video bus is already unloaded, don't * unload it again and return directly. */ return; } acpi_bus_unregister_driver(&acpi_video_bus); register_count = 0; return; } EXPORT_SYMBOL(acpi_video_unregister); /* * This is kind of nasty. Hardware using Intel chipsets may require * the video opregion code to be run first in order to initialise * state before any ACPI video calls are made. To handle this we defer * registration of the video class until the opregion code has run. */ static int __init acpi_video_init(void) { dmi_check_system(video_dmi_table); if (intel_opregion_present()) return 0; return acpi_video_register(); } static void __exit acpi_video_exit(void) { acpi_video_unregister(); return; } module_init(acpi_video_init); module_exit(acpi_video_exit);