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- /*
- * 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.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- */
- #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 <asm/uaccess.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);
- static int disable_backlight_sysfs_if = -1;
- module_param(disable_backlight_sysfs_if, int, 0444);
- static bool device_id_scheme = false;
- module_param(device_id_scheme, bool, 0444);
- static bool only_lcd = false;
- module_param(only_lcd, bool, 0444);
- static int register_count;
- static DEFINE_MUTEX(register_count_mutex);
- 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);
- void acpi_video_detect_exit(void);
- 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;
- 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_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 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 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 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 = 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);
- 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 - 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 video_set_bqc_offset(const struct dmi_system_id *d)
- {
- bqc_offset_aml_bug_workaround = 9;
- return 0;
- }
- static int video_disable_backlight_sysfs_if(
- const struct dmi_system_id *d)
- {
- if (disable_backlight_sysfs_if == -1)
- disable_backlight_sysfs_if = 1;
- 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 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 machines have a broken acpi-video interface for brightness
- * control, but still need an acpi_video_device_lcd_set_level() call
- * on resume to turn the backlight power on. We Enable backlight
- * control on these systems, but do not register a backlight sysfs
- * as brightness control does not work.
- */
- {
- /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
- .callback = video_disable_backlight_sysfs_if,
- .ident = "Toshiba Portege R700",
- .matches = {
- DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
- DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
- },
- },
- {
- /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
- .callback = video_disable_backlight_sysfs_if,
- .ident = "Toshiba Portege R830",
- .matches = {
- DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
- DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
- },
- },
- {
- /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
- .callback = video_disable_backlight_sysfs_if,
- .ident = "Toshiba Satellite R830",
- .matches = {
- DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
- DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
- },
- },
- /*
- * 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"),
- },
- },
- {}
- };
- 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;
- u32 value;
- 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;
- }
- value = (u32) o->integer.value;
- /* Skip duplicate entries */
- if (count > 2 && 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 = 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;
- 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;
- 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);
- 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));
- }
- }
- }
- 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_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 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)
- printk(KERN_ERR PREFIX "Failed to switch the 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)
- {
- 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;
- }
- video->child_count++;
- }
- 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 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;
- 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_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->brightness)
- acpi_video_device_lcd_set_level(video_device,
- video_device->brightness->curr);
- }
- 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)
- {
- 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;
- if (disable_backlight_sysfs_if > 0)
- 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)) {
- 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)
- 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 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, &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;
- acpi_video_run_bcl_for_osi(video);
- 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;
- 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 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_vide_bus again and return no error.
- */
- goto leave;
- }
- mutex_init(&video_list_lock);
- INIT_LIST_HEAD(&video_bus_head);
- 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;
- }
- mutex_unlock(®ister_count_mutex);
- }
- EXPORT_SYMBOL(acpi_video_unregister);
- void acpi_video_unregister_backlight(void)
- {
- struct acpi_video_bus *video;
- mutex_lock(®ister_count_mutex);
- if (register_count) {
- mutex_lock(&video_list_lock);
- list_for_each_entry(video, &video_bus_head, entry)
- acpi_video_bus_unregister_backlight(video);
- mutex_unlock(&video_list_lock);
- }
- mutex_unlock(®ister_count_mutex);
- }
- /*
- * 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_detect_exit();
- acpi_video_unregister();
- return;
- }
- module_init(acpi_video_init);
- module_exit(acpi_video_exit);
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