| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Rui Zhang | 1987 | 22.55% | 25 | 14.71% |
| Aaron Lu | 1783 | 20.23% | 15 | 8.82% |
| Len Brown | 1749 | 19.85% | 8 | 4.71% |
| Hans de Goede | 655 | 7.43% | 26 | 15.29% |
| Matthew Garrett | 627 | 7.12% | 11 | 6.47% |
| Yu Luming | 430 | 4.88% | 3 | 1.76% |
| Rafael J. Wysocki | 323 | 3.67% | 9 | 5.29% |
| Thomas Tuttle | 177 | 2.01% | 1 | 0.59% |
| Dmitry Torokhov | 167 | 1.90% | 6 | 3.53% |
| Linus Torvalds | 104 | 1.18% | 4 | 2.35% |
| Danny Baumann | 100 | 1.13% | 3 | 1.76% |
| Andy Grover | 99 | 1.12% | 3 | 1.76% |
| Patrick Mochel | 94 | 1.07% | 5 | 2.94% |
| Alexey Y. Starikovskiy | 84 | 0.95% | 2 | 1.18% |
| Dmitry Frank | 66 | 0.75% | 2 | 1.18% |
| Alan Cox | 55 | 0.62% | 2 | 1.18% |
| Igor Murzov | 34 | 0.39% | 3 | 1.76% |
| Yakui Zhao | 30 | 0.34% | 2 | 1.18% |
| Thomas Renninger | 30 | 0.34% | 2 | 1.18% |
| Vladimir Serbinenko | 29 | 0.33% | 1 | 0.59% |
| Felipe Contreras | 27 | 0.31% | 1 | 0.59% |
| Jan Engelhardt | 24 | 0.27% | 1 | 0.59% |
| Richard Purdie | 14 | 0.16% | 2 | 1.18% |
| Jiang Liu | 14 | 0.16% | 2 | 1.18% |
| Julia Jomantaite | 13 | 0.15% | 1 | 0.59% |
| Alex Hung | 12 | 0.14% | 1 | 0.59% |
| Chris Wilson | 11 | 0.12% | 2 | 1.18% |
| Björn Helgaas | 10 | 0.11% | 1 | 0.59% |
| Corentin Chary | 5 | 0.06% | 1 | 0.59% |
| Keith Packard | 5 | 0.06% | 1 | 0.59% |
| Luca Tettamanti | 4 | 0.05% | 1 | 0.59% |
| Pavel Machek | 4 | 0.05% | 1 | 0.59% |
| Dan Carpenter | 4 | 0.05% | 1 | 0.59% |
| Andi Kleen | 4 | 0.05% | 1 | 0.59% |
| Burman Yan | 3 | 0.03% | 1 | 0.59% |
| Karol Kozimor | 3 | 0.03% | 1 | 0.59% |
| Dawei Li | 3 | 0.03% | 1 | 0.59% |
| Matthew Wilcox | 3 | 0.03% | 1 | 0.59% |
| Lv Zheng | 3 | 0.03% | 1 | 0.59% |
| Linus Torvalds (pre-git) | 2 | 0.02% | 1 | 0.59% |
| Colin Ian King | 2 | 0.02% | 1 | 0.59% |
| Paulo Marques | 2 | 0.02% | 1 | 0.59% |
| Rusty Russell | 2 | 0.02% | 1 | 0.59% |
| Julius Volz | 2 | 0.02% | 1 | 0.59% |
| Thomas Gleixner | 2 | 0.02% | 1 | 0.59% |
| Tom Saeger | 2 | 0.02% | 1 | 0.59% |
| Kees Cook | 2 | 0.02% | 1 | 0.59% |
| Kacper Piwiński | 2 | 0.02% | 2 | 1.18% |
| Justin P. Mattock | 1 | 0.01% | 1 | 0.59% |
| Gustavo A. R. Silva | 1 | 0.01% | 1 | 0.59% |
| Christoph Hellwig | 1 | 0.01% | 1 | 0.59% |
| Vasiliy Kulikov | 1 | 0.01% | 1 | 0.59% |
| Lionel Debroux | 1 | 0.01% | 1 | 0.59% |
| Total | 8812 | 170 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * video.c - ACPI Video Driver * * Copyright (C) 2004 Luming Yu <luming.yu@intel.com> * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org> * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net> */ #define pr_fmt(fmt) "ACPI: video: " fmt #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> #include <linux/list.h> #include <linux/mutex.h> #include <linux/input.h> #include <linux/backlight.h> #include <linux/thermal.h> #include <linux/sort.h> #include <linux/pci.h> #include <linux/pci_ids.h> #include <linux/slab.h> #include <linux/dmi.h> #include <linux/suspend.h> #include <linux/acpi.h> #include <acpi/video.h> #include <linux/uaccess.h> #define ACPI_VIDEO_BUS_NAME "Video Bus" #define ACPI_VIDEO_DEVICE_NAME "Video Device" #define MAX_NAME_LEN 20 MODULE_AUTHOR("Bruno Ducrot"); MODULE_DESCRIPTION("ACPI Video Driver"); MODULE_LICENSE("GPL"); static bool brightness_switch_enabled = true; 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); #define REPORT_OUTPUT_KEY_EVENTS 0x01 #define REPORT_BRIGHTNESS_KEY_EVENTS 0x02 static int report_key_events = -1; module_param(report_key_events, int, 0644); MODULE_PARM_DESC(report_key_events, "0: none, 1: output changes, 2: brightness changes, 3: all"); static int hw_changes_brightness = -1; module_param(hw_changes_brightness, int, 0644); MODULE_PARM_DESC(hw_changes_brightness, "Set this to 1 on buggy hw which changes the brightness itself when " "a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness"); /* * Whether the struct acpi_video_device_attrib::device_id_scheme bit should be * assumed even if not actually set. */ static bool device_id_scheme = false; module_param(device_id_scheme, bool, 0444); static int only_lcd = -1; module_param(only_lcd, int, 0444); static bool may_report_brightness_keys; static int register_count; static DEFINE_MUTEX(register_count_mutex); static DEFINE_MUTEX(video_list_lock); static LIST_HEAD(video_bus_head); static int acpi_video_bus_add(struct acpi_device *device); static void acpi_video_bus_remove(struct acpi_device *device); static void acpi_video_bus_notify(struct acpi_device *device, u32 event); /* * Indices in the _BCL method response: the first two items are special, * the rest are all supported levels. * * See page 575 of the ACPI spec 3.0 */ enum acpi_video_level_idx { ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */ ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */ ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */ }; 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 */ /* * The device ID might not actually follow the scheme described by this * struct acpi_video_device_attrib. If it does, then this bit * device_id_scheme is set; otherwise, other fields should be ignored. * * (but also see the global flag device_id_scheme) */ u32 device_id_scheme:1; }; 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; bool backlight_registered; u8 dos_setting; struct acpi_video_enumerated_device *attached_array; u8 attached_count; u8 child_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 list_head entry; 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_device { unsigned long device_id; struct acpi_video_device_flags flags; struct acpi_video_device_cap cap; struct list_head entry; struct delayed_work switch_brightness_work; int switch_brightness_event; 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 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 void acpi_video_switch_brightness(struct work_struct *work); /* 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 = bl_get_data(bd); if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false)) return -EINVAL; for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) { if (vd->brightness->levels[i] == cur_level) return i - ACPI_VIDEO_FIRST_LEVEL; } return 0; } static int acpi_video_set_brightness(struct backlight_device *bd) { int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL; struct acpi_video_device *vd = bl_get_data(bd); cancel_delayed_work(&vd->switch_brightness_work); 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 - ACPI_VIDEO_FIRST_LEVEL - 1; 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 = ACPI_VIDEO_FIRST_LEVEL; 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 - ACPI_VIDEO_FIRST_LEVEL) 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(acpi_handle handle, union acpi_object **levels) { int status; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *obj; *levels = NULL; status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer); if (ACPI_FAILURE(status)) return status; obj = (union acpi_object *)buffer.pointer; if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { acpi_handle_info(handle, "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; int state; status = acpi_execute_simple_method(device->dev->handle, "_BCM", level); if (ACPI_FAILURE(status)) { acpi_handle_info(device->dev->handle, "_BCM evaluation failed\n"); return -EIO; } device->brightness->curr = level; for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count; state++) if (level == device->brightness->levels[state]) { if (device->backlight) device->backlight->props.brightness = state - ACPI_VIDEO_FIRST_LEVEL; return 0; } acpi_handle_info(device->dev->handle, "Current brightness invalid\n"); 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 video_set_bqc_offset(const struct dmi_system_id *d) { bqc_offset_aml_bug_workaround = 9; return 0; } static int video_set_device_id_scheme(const struct dmi_system_id *d) { device_id_scheme = true; return 0; } static int video_enable_only_lcd(const struct dmi_system_id *d) { only_lcd = true; return 0; } static int video_set_report_key_events(const struct dmi_system_id *id) { if (report_key_events == -1) report_key_events = (uintptr_t)id->driver_data; return 0; } static int video_hw_changes_brightness( const struct dmi_system_id *d) { if (hw_changes_brightness == -1) hw_changes_brightness = 1; return 0; } static const struct dmi_system_id video_dmi_table[] = { /* * 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"), }, }, /* * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set * but the IDs actually follow the Device ID Scheme. */ { /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ .callback = video_set_device_id_scheme, .ident = "ESPRIMO Mobile M9410", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), }, }, /* * Some machines have multiple video output devices, but only the one * that is the type of LCD can do the backlight control so we should not * register backlight interface for other video output devices. */ { /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ .callback = video_enable_only_lcd, .ident = "ESPRIMO Mobile M9410", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), }, }, /* * Some machines report wrong key events on the acpi-bus, suppress * key event reporting on these. Note this is only intended to work * around events which are plain wrong. In some cases we get double * events, in this case acpi-video is considered the canonical source * and the events from the other source should be filtered. E.g. * by calling acpi_video_handles_brightness_key_presses() from the * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb */ { .callback = video_set_report_key_events, .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS), .ident = "Dell Vostro V131", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), }, }, { .callback = video_set_report_key_events, .driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS), .ident = "Dell Vostro 3350", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"), }, }, /* * Some machines change the brightness themselves when a brightness * hotkey gets pressed, despite us telling them not to. In this case * acpi_video_device_notify() should only call backlight_force_update( * BACKLIGHT_UPDATE_HOTKEY) and not do anything else. */ { /* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */ .callback = video_hw_changes_brightness, .ident = "Packard Bell EasyNote MZ35", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"), DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"), }, }, {} }; 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 (see enum acpi_video_level_idx), * so we need to compensate for that by offsetting ourselves */ if (device->brightness->flags._BCL_reversed) bqc_value = device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value; level = device->brightness->levels[bqc_value + ACPI_VIDEO_FIRST_LEVEL]; } 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 = ACPI_VIDEO_FIRST_LEVEL; 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_handle_info(device->dev->handle, "%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_handle_info(device->dev->handle, "%s evaluation 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 { acpi_handle_info(device->dev->handle, "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 (ACPI appendix B) * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) * 1. The system BIOS should NOT automatically control the brightness * level of the LCD when: * - the power changes from AC to DC (ACPI appendix B) * - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) * 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; if (!video->cap._DOS) return 0; if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) return -EINVAL; video->dos_setting = (lcd_flag << 2) | bios_flag; status = acpi_execute_simple_method(video->device->handle, "_DOS", (lcd_flag << 2) | bios_flag); 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. However, * there is a subtlety: * * If the _BCL package ordering is descending, the first level * (br->levels[2]) is likely to be 0, and if the number of levels * matches the number of steps, we might confuse a returned level to * mean the index. * * For example: * * current_level = max_level = 100 * test_level = 0 * returned level = 100 * * In this case 100 means the level, not the index, and _BCM failed. * Still, if the _BCL package ordering is descending, the index of * level 0 is also 100, so we assume _BQC is indexed, when it's not. * * This causes all _BQC calls to return bogus values causing weird * behavior from the user's perspective. For example: * * xbacklight -set 10; xbacklight -set 20; * * would flash to 90% and then slowly down to the desired level (20). * * The solution is simple; test anything other than the first level * (e.g. 1). */ test_level = current_level == max_level ? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] : 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 - ACPI_VIDEO_FIRST_LEVEL - 1 - level; if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) br->flags._BQC_use_index = 1; } if (!br->flags._BQC_use_index) device->cap._BQC = device->cap._BCQ = 0; } return 0; } int acpi_video_get_levels(struct acpi_device *device, struct acpi_video_device_brightness **dev_br, int *pmax_level) { union acpi_object *obj = NULL; int i, max_level = 0, count = 0, level_ac_battery = 0; union acpi_object *o; struct acpi_video_device_brightness *br = NULL; int result = 0; u32 value; if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) { acpi_handle_debug(device->handle, "Could not query available LCD brightness level\n"); result = -ENODEV; goto out; } if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) { result = -EINVAL; goto out; } br = kzalloc(sizeof(*br), GFP_KERNEL); if (!br) { result = -ENOMEM; goto out; } /* * Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), * in order to account for buggy BIOS which don't export the first two * special levels (see below) */ br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, 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) { acpi_handle_info(device->handle, "Invalid data\n"); continue; } value = (u32) o->integer.value; /* Skip duplicate entries */ if (count > ACPI_VIDEO_FIRST_LEVEL && br->levels[count - 1] == value) continue; br->levels[count] = 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 = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) level_ac_battery++; if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) level_ac_battery++; } if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; br->flags._BCL_no_ac_battery_levels = 1; for (i = (count - 1 + level_ac_battery); i >= ACPI_VIDEO_FIRST_LEVEL; i--) br->levels[i] = br->levels[i - level_ac_battery]; count += level_ac_battery; } else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) acpi_handle_info(device->handle, "Too many duplicates in _BCL package"); /* Check if the _BCL package is in a reversed order */ if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { br->flags._BCL_reversed = 1; sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL], count - ACPI_VIDEO_FIRST_LEVEL, sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), acpi_video_cmp_level, NULL); } else if (max_level != br->levels[count - 1]) acpi_handle_info(device->handle, "Found unordered _BCL package"); br->count = count; *dev_br = br; if (pmax_level) *pmax_level = max_level; out: kfree(obj); return result; out_free: kfree(br); goto out; } EXPORT_SYMBOL(acpi_video_get_levels); /* * 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) { int i, max_level = 0; unsigned long long level, level_old; struct acpi_video_device_brightness *br = NULL; int result; result = acpi_video_get_levels(device->dev, &br, &max_level); if (result) return result; device->brightness = br; /* _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; 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 = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) if (level == br->levels[i]) break; if (i == br->count || !level) level = max_level; set_level: result = acpi_video_device_lcd_set_level(device, level); if (result) goto out_free_levels; acpi_handle_debug(device->dev->handle, "found %d brightness levels\n", br->count - ACPI_VIDEO_FIRST_LEVEL); return 0; out_free_levels: kfree(br->levels); kfree(br); device->brightness = NULL; 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) { if (acpi_has_method(device->dev->handle, "_ADR")) device->cap._ADR = 1; if (acpi_has_method(device->dev->handle, "_BCL")) device->cap._BCL = 1; if (acpi_has_method(device->dev->handle, "_BCM")) device->cap._BCM = 1; if (acpi_has_method(device->dev->handle, "_BQC")) { device->cap._BQC = 1; } else if (acpi_has_method(device->dev->handle, "_BCQ")) { acpi_handle_info(device->dev->handle, "_BCQ is used instead of _BQC\n"); device->cap._BCQ = 1; } if (acpi_has_method(device->dev->handle, "_DDC")) device->cap._DDC = 1; } /* * 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) { if (acpi_has_method(video->device->handle, "_DOS")) video->cap._DOS = 1; if (acpi_has_method(video->device->handle, "_DOD")) video->cap._DOD = 1; if (acpi_has_method(video->device->handle, "_ROM")) video->cap._ROM = 1; if (acpi_has_method(video->device->handle, "_GPD")) video->cap._GPD = 1; if (acpi_has_method(video->device->handle, "_SPD")) video->cap._SPD = 1; if (acpi_has_method(video->device->handle, "_VPO")) 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) { pr_info(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, void *arg) { struct acpi_video_bus *video = arg; struct acpi_video_device_attrib *attribute; struct acpi_video_device *data; unsigned long long device_id; acpi_status status; int device_type; status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); /* Skip devices without _ADR instead of failing. */ if (ACPI_FAILURE(status)) goto exit; data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); if (!data) { dev_dbg(&device->dev, "Cannot attach\n"); 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; INIT_DELAYED_WORK(&data->switch_brightness_work, acpi_video_switch_brightness); attribute = acpi_video_get_device_attr(video, device_id); if (attribute && (attribute->device_id_scheme || 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); if (data->cap._BCM && data->cap._BCL) may_report_brightness_keys = true; mutex_lock(&video->device_list_lock); list_add_tail(&data->entry, &video->video_device_list); mutex_unlock(&video->device_list_lock); exit: video->child_count++; return 0; } /* * 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_handle_debug(video->device->handle, "%s: %d\n", __func__, i); } } } static bool acpi_video_device_in_dod(struct acpi_video_device *device) { struct acpi_video_bus *video = device->video; int i; /* * If we have a broken _DOD or we have more than 8 output devices * under the graphics controller node that we can't proper deal with * in the operation region code currently, no need to test. */ if (!video->attached_count || video->child_count > 8) return true; for (i = 0; i < video->attached_count; i++) { if ((video->attached_array[i].value.int_val & 0xfff) == (device->device_id & 0xfff)) return true; } return false; } /* * 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; if (!video->cap._DOD) return AE_NOT_EXIST; status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); if (ACPI_FAILURE(status)) { acpi_handle_info(video->device->handle, "_DOD evaluation failed: %s\n", acpi_format_exception(status)); return status; } dod = buffer.pointer; if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { acpi_handle_info(video->device->handle, "Invalid _DOD data\n"); status = -EFAULT; goto out; } acpi_handle_debug(video->device->handle, "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) { acpi_handle_info(video->device->handle, "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_handle_debug(video->device->handle, "_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 = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { l = device->brightness->levels[i]; if (abs(l - level_current) < abs(delta)) { delta = l - level_current; if (!delta) break; } } /* Adjust level_current to closest available level */ level_current += delta; for (i = ACPI_VIDEO_FIRST_LEVEL; 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 void acpi_video_switch_brightness(struct work_struct *work) { struct acpi_video_device *device = container_of(to_delayed_work(work), struct acpi_video_device, switch_brightness_work); unsigned long long level_current, level_next; int event = device->switch_brightness_event; int result = -EINVAL; /* no warning message if acpi_backlight=vendor or a quirk is used */ if (!device->backlight) return; 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) acpi_handle_info(device->dev->handle, "Failed to switch brightness\n"); } 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) { /* * 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); return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video); } /* acpi_video interface */ /* * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't * perform any automatic brightness change on receiving a notification. */ static int acpi_video_bus_start_devices(struct acpi_video_bus *video) { return acpi_video_bus_DOS(video, 0, acpi_osi_is_win8() ? 1 : 0); } static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) { return acpi_video_bus_DOS(video, 0, acpi_osi_is_win8() ? 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 || !video->input) return; input = video->input; switch (event) { case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, * most likely via hotkey. */ 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); keycode = KEY_SWITCHVIDEOMODE; break; case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ keycode = KEY_SWITCHVIDEOMODE; break; case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ keycode = KEY_VIDEO_NEXT; break; case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ keycode = KEY_VIDEO_PREV; break; default: acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", event); break; } if (acpi_notifier_call_chain(device, event, 0)) /* Something vetoed the keypress. */ keycode = 0; if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { input_report_key(input, keycode, 1); input_sync(input); input_report_key(input, keycode, 0); input_sync(input); } } static void brightness_switch_event(struct acpi_video_device *video_device, u32 event) { if (!brightness_switch_enabled) return; video_device->switch_brightness_event = event; schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); } 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; if (hw_changes_brightness > 0) { if (video_device->backlight) backlight_force_update(video_device->backlight, BACKLIGHT_UPDATE_HOTKEY); acpi_notifier_call_chain(device, event, 0); return; } switch (event) { case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ brightness_switch_event(video_device, event); keycode = KEY_BRIGHTNESS_CYCLE; break; case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ brightness_switch_event(video_device, event); keycode = KEY_BRIGHTNESSUP; break; case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ brightness_switch_event(video_device, event); keycode = KEY_BRIGHTNESSDOWN; break; case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ brightness_switch_event(video_device, event); keycode = KEY_BRIGHTNESS_ZERO; break; case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ brightness_switch_event(video_device, event); keycode = KEY_DISPLAY_OFF; break; default: acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event); break; } if (keycode) may_report_brightness_keys = true; acpi_notifier_call_chain(device, event, 0); if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { input_report_key(input, keycode, 1); input_sync(input); input_report_key(input, keycode, 0); input_sync(input); } } 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_POST_HIBERNATION: case PM_POST_SUSPEND: case PM_POST_RESTORE: 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->brightness) acpi_video_device_lcd_set_level(video_device, video_device->brightness->curr); } return NOTIFY_OK; } return NOTIFY_DONE; } 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; if (handle == device->handle) return AE_CTRL_TERMINATE; sibling = acpi_fetch_acpi_dev(handle); if (!sibling) return AE_OK; if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) return AE_ALREADY_EXISTS; return AE_OK; } static void acpi_video_dev_register_backlight(struct acpi_video_device *device) { struct backlight_properties props; struct pci_dev *pdev; acpi_handle acpi_parent; struct device *parent = NULL; int result; static int count; 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 - ACPI_VIDEO_FIRST_LEVEL - 1; device->backlight = backlight_device_register(name, parent, device, &acpi_backlight_ops, &props); kfree(name); if (IS_ERR(device->backlight)) { device->backlight = NULL; 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) pr_info("sysfs link creation failed\n"); result = sysfs_create_link(&device->cooling_dev->device.kobj, &device->dev->dev.kobj, "device"); if (result) pr_info("Reverse sysfs link creation failed\n"); } static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) { struct acpi_video_device *dev; union acpi_object *levels; mutex_lock(&video->device_list_lock); list_for_each_entry(dev, &video->video_device_list, entry) { if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels)) kfree(levels); } mutex_unlock(&video->device_list_lock); } static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) { /* * Do not create backlight device for video output * device that is not in the enumerated list. */ if (!acpi_video_device_in_dod(dev)) { dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); return false; } if (only_lcd) return dev->flags.lcd; return true; } static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) { struct acpi_video_device *dev; if (video->backlight_registered) return 0; if (acpi_video_get_backlight_type() != acpi_backlight_video) return 0; mutex_lock(&video->device_list_lock); list_for_each_entry(dev, &video->video_device_list, entry) { if (acpi_video_should_register_backlight(dev)) acpi_video_dev_register_backlight(dev); } mutex_unlock(&video->device_list_lock); video->backlight_registered = true; video->pm_nb.notifier_call = acpi_video_resume; video->pm_nb.priority = 0; return register_pm_notifier(&video->pm_nb); } static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) { if (device->backlight) { backlight_device_unregister(device->backlight); device->backlight = NULL; } if (device->brightness) { kfree(device->brightness->levels); kfree(device->brightness); device->brightness = 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; } } static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) { struct acpi_video_device *dev; int error; if (!video->backlight_registered) return 0; error = unregister_pm_notifier(&video->pm_nb); mutex_lock(&video->device_list_lock); list_for_each_entry(dev, &video->video_device_list, entry) acpi_video_dev_unregister_backlight(dev); mutex_unlock(&video->device_list_lock); video->backlight_registered = false; return error; } static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) { acpi_status status; struct acpi_device *adev = device->dev; status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, acpi_video_device_notify, device); if (ACPI_FAILURE(status)) dev_err(&adev->dev, "Error installing notify handler\n"); else device->flags.notify = 1; } static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) { struct input_dev *input; struct acpi_video_device *dev; int error; video->input = input = input_allocate_device(); if (!input) { error = -ENOMEM; goto out; } error = acpi_video_bus_start_devices(video); if (error) goto err_free_input; 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 = &video->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); error = input_register_device(input); if (error) goto err_stop_dev; mutex_lock(&video->device_list_lock); list_for_each_entry(dev, &video->video_device_list, entry) acpi_video_dev_add_notify_handler(dev); mutex_unlock(&video->device_list_lock); return 0; err_stop_dev: acpi_video_bus_stop_devices(video); err_free_input: input_free_device(input); video->input = NULL; out: return error; } static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) { if (dev->flags.notify) { acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, acpi_video_device_notify); dev->flags.notify = 0; } } static void acpi_video_bus_remove_notify_handler(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_dev_remove_notify_handler(dev); mutex_unlock(&video->device_list_lock); acpi_video_bus_stop_devices(video); input_unregister_device(video->input); video->input = NULL; } static int acpi_video_bus_put_devices(struct acpi_video_bus *video) { struct acpi_video_device *dev, *next; mutex_lock(&video->device_list_lock); list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { list_del(&dev->entry); kfree(dev); } mutex_unlock(&video->device_list_lock); return 0; } static int instance; static int acpi_video_bus_add(struct acpi_device *device) { struct acpi_video_bus *video; bool auto_detect; int error; acpi_status status; status = acpi_walk_namespace(ACPI_TYPE_DEVICE, acpi_dev_parent(device)->handle, 1, acpi_video_bus_match, NULL, device, NULL); if (status == AE_ALREADY_EXISTS) { pr_info(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; pr_info("%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"); mutex_lock(&video_list_lock); list_add_tail(&video->entry, &video_bus_head); mutex_unlock(&video_list_lock); /* * If backlight-type auto-detection is used then a native backlight may * show up later and this may change the result from video to native. * Therefor normally the userspace visible /sys/class/backlight device * gets registered separately by the GPU driver calling * acpi_video_register_backlight() when an internal panel is detected. * Register the backlight now when not using auto-detection, so that * when the kernel cmdline or DMI-quirks are used the backlight will * get registered even if acpi_video_register_backlight() is not called. */ acpi_video_run_bcl_for_osi(video); if (__acpi_video_get_backlight_type(false, &auto_detect) == acpi_backlight_video && !auto_detect) acpi_video_bus_register_backlight(video); acpi_video_bus_add_notify_handler(video); return 0; 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 void acpi_video_bus_remove(struct acpi_device *device) { struct acpi_video_bus *video = NULL; if (!device || !acpi_driver_data(device)) return; video = acpi_driver_data(device); mutex_lock(&video_list_lock); list_del(&video->entry); mutex_unlock(&video_list_lock); acpi_video_bus_remove_notify_handler(video); acpi_video_bus_unregister_backlight(video); acpi_video_bus_put_devices(video); kfree(video->attached_array); kfree(video); } 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; } /* Check if the chassis-type indicates there is no builtin LCD panel */ static bool dmi_is_desktop(void) { const char *chassis_type; unsigned long type; chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); if (!chassis_type) return false; if (kstrtoul(chassis_type, 10, &type) != 0) return false; switch (type) { case 0x03: /* Desktop */ case 0x04: /* Low Profile Desktop */ case 0x05: /* Pizza Box */ case 0x06: /* Mini Tower */ case 0x07: /* Tower */ case 0x10: /* Lunch Box */ case 0x11: /* Main Server Chassis */ return true; } return false; } /* * We're seeing a lot of bogus backlight interfaces on newer machines * without a LCD such as desktops, servers and HDMI sticks. Checking the * lcd flag fixes this, enable this by default on any machines which are: * 1. Win8 ready (where we also prefer the native backlight driver, so * normally the acpi_video code should not register there anyways); *and* * 2.1 Report a desktop/server DMI chassis-type, or * 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for backlight control) */ static bool should_check_lcd_flag(void) { if (!acpi_osi_is_win8()) return false; if (dmi_is_desktop()) return true; if (acpi_reduced_hardware()) return true; return false; } int acpi_video_register(void) { int ret = 0; mutex_lock(®ister_count_mutex); if (register_count) { /* * if the function of acpi_video_register is already called, * don't register the acpi_video_bus again and return no error. */ goto leave; } if (only_lcd == -1) only_lcd = should_check_lcd_flag(); dmi_check_system(video_dmi_table); ret = acpi_bus_register_driver(&acpi_video_bus); if (ret) goto leave; /* * When the acpi_video_bus is loaded successfully, increase * the counter reference. */ register_count = 1; leave: mutex_unlock(®ister_count_mutex); return ret; } EXPORT_SYMBOL(acpi_video_register); void acpi_video_unregister(void) { mutex_lock(®ister_count_mutex); if (register_count) { acpi_bus_unregister_driver(&acpi_video_bus); register_count = 0; may_report_brightness_keys = false; } mutex_unlock(®ister_count_mutex); } EXPORT_SYMBOL(acpi_video_unregister); void acpi_video_register_backlight(void) { struct acpi_video_bus *video; mutex_lock(&video_list_lock); list_for_each_entry(video, &video_bus_head, entry) acpi_video_bus_register_backlight(video); mutex_unlock(&video_list_lock); } EXPORT_SYMBOL(acpi_video_register_backlight); bool acpi_video_handles_brightness_key_presses(void) { return may_report_brightness_keys && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); } EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); /* * 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) { /* * Let the module load even if ACPI is disabled (e.g. due to * a broken BIOS) so that i915.ko can still be loaded on such * old systems without an AcpiOpRegion. * * acpi_video_register() will report -ENODEV later as well due * to acpi_disabled when i915.ko tries to register itself afterwards. */ if (acpi_disabled) return 0; if (intel_opregion_present()) return 0; return acpi_video_register(); } static void __exit acpi_video_exit(void) { acpi_video_unregister(); } module_init(acpi_video_init); module_exit(acpi_video_exit);
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