| /* |
| * 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> |
| * |
| * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| * |
| * 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 <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 <asm/uaccess.h> |
| #include <linux/dmi.h> |
| #include <acpi/acpi_bus.h> |
| #include <acpi/acpi_drivers.h> |
| #include <linux/suspend.h> |
| #include <acpi/video.h> |
| |
| #include "internal.h" |
| |
| #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); |
| |
| /* |
| * For Windows 8 systems: if set ture and the GPU driver has |
| * registered a backlight interface, skip registering ACPI video's. |
| */ |
| static bool use_native_backlight = false; |
| module_param(use_native_backlight, bool, 0644); |
| |
| static int register_count; |
| static struct mutex video_list_lock; |
| static struct list_head video_bus_head; |
| 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 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_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 _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); |
| |
| static bool acpi_video_verify_backlight_support(void) |
| { |
| if (acpi_osi_is_win8() && use_native_backlight && |
| backlight_device_registered(BACKLIGHT_RAW)) |
| return false; |
| return acpi_video_backlight_support(); |
| } |
| |
| /* 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 = 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 = 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; |
| int state; |
| |
| status = acpi_execute_simple_method(device->dev->handle, |
| "_BCM", level); |
| 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 = "Fujitsu E753", |
| .matches = { |
| DMI_MATCH(DMI_BOARD_VENDOR, "FUJITSU"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E753"), |
| }, |
| }, |
| { |
| .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; |
| |
| 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. |
| */ |
| test_level = current_level == max_level ? br->levels[3] : 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; |
| |
| /* _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 == 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_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) |
| { |
| 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")) { |
| printk(KERN_WARNING FW_BUG "_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) { |
| 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 && 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); |
| |
| 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 or a quirk is used */ |
| if (!acpi_video_verify_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; |
| } |
| |
| /* acpi_video interface */ |
| |
| /* |
| * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't |
| * preform 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_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); |
| keycode = KEY_BRIGHTNESS_CYCLE; |
| break; |
| case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ |
| if (brightness_switch_enabled) |
| acpi_video_switch_brightness(video_device, event); |
| keycode = KEY_BRIGHTNESSUP; |
| break; |
| case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ |
| if (brightness_switch_enabled) |
| acpi_video_switch_brightness(video_device, event); |
| keycode = KEY_BRIGHTNESSDOWN; |
| break; |
| case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ |
| if (brightness_switch_enabled) |
| acpi_video_switch_brightness(video_device, event); |
| 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); |
| 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 void acpi_video_dev_register_backlight(struct acpi_video_device *device) |
| { |
| if (acpi_video_verify_backlight_support()) { |
| 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 - 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"); |
| } |
| } |
| |
| static int acpi_video_bus_register_backlight(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_register_backlight(dev); |
| mutex_unlock(&video->device_list_lock); |
| |
| 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 = 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); |
| |
| 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; |
| int error; |
| acpi_status status; |
| |
| 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; |
| |
| 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"); |
| mutex_lock(&video_list_lock); |
| list_add_tail(&video->entry, &video_bus_head); |
| mutex_unlock(&video_list_lock); |
| |
| 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 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); |
| |
| acpi_video_bus_remove_notify_handler(video); |
| acpi_video_bus_unregister_backlight(video); |
| acpi_video_bus_put_devices(video); |
| |
| mutex_lock(&video_list_lock); |
| list_del(&video->entry); |
| mutex_unlock(&video_list_lock); |
| |
| 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; |
| } |
| |
| mutex_init(&video_list_lock); |
| INIT_LIST_HEAD(&video_bus_head); |
| |
| 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); |