CN100472402C - Power management method for built-in camera - Google Patents
Power management method for built-in camera Download PDFInfo
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- CN100472402C CN100472402C CNB2005100018631A CN200510001863A CN100472402C CN 100472402 C CN100472402 C CN 100472402C CN B2005100018631 A CNB2005100018631 A CN B2005100018631A CN 200510001863 A CN200510001863 A CN 200510001863A CN 100472402 C CN100472402 C CN 100472402C
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Abstract
The invention discloses a method for managing power of built-in camera which comprises steps of: switch setting step, controlling the on and off of system power and camera general serial bus interface via the high/low level output from main board chip; power control step, controlling the level output from the main board chip output interface for providing power when loading camera application. The invention modifies the hardware circuit of the built-in camera by employing GPIO to control power of USB plugging components in the USB interface connected with the camera, and realizing the control of camera power via controlling GPIO, thereby prolonging cell endurance.
Description
Technical field
The present invention relates to the method for managing power supply of universal serial bus device, refer to a kind of method for managing power supply of built-in camera especially.
Background technology
Along with the raising of the integrated level of the universal serial bus device of the passive response of USB (Universal Serial Bus, USB (universal serial bus)) interface, for example, be example with the camera, increasing notebook computer provides the built-in camera function.Built-in camera can cause system power dissipation to increase, and mainly contain two reasons: the first, the built-in camera major part all is USB (1.1/2.0) interface, also needs consumed power even camera is in off position.The second, because after system's insertion USB device, CPU can break away from low power consumpting state; So, behind the notebook built-in camera,, seeing that from system perspective USB device will exist always as long as under open state, CPU just enters into low power consumpting state never in this case, thereby causes the increase of power consumption.
For USB device, once be inserted in the system.Whether the signal wire of USB can have signal output always, so attempt promptly to enable to realize that this way cost is also very high by transforming hardware, increasing the hardware monitoring circuit and differentiate USB device and have the transmission state signal difficulty very big.
Equally also there is this problem in the USB camera.Built-in camera need be from the power taking of notebook USB interface, thus can not accomplish as required control to self power switch, for example postpone in the camera under open state, the user can't reduce the total system power consumption by the plug camera.With hardware realize camera automatically control can cause the increase of notebook cost, and can influence the hardware design of whole notebook, realize that difficulty is also very big.Unfriendly aspect user experience, for example: open the camera power supply if when start user forgets, during the relevant software of operation camera, system can report an error; If firmware (Firmware) is default when start camera is opened, and the user does not use the camera related software, can cause system power dissipation to rise, and influences the battery flying power.
Summary of the invention
The problem that the present invention solves provides a kind of method for managing power supply of built-in camera, only power supply when USB device is worked.
For addressing the above problem, the invention provides a kind of method for managing power supply of built-in camera, comprise step: switch is provided with step, by level height control system power supply and the disconnection of camera USB (universal serial bus) or the connection of mainboard chip output mouth output; The power supply controlled step, the level output of control main board chip output mouth, making only is the camera power supply when loading is used in shooting;
The power supply controlled step further comprises:
1) create virtual photographing module, notifying operation system virtualization camera loads, the calling interface that described virtual photographing module provides shooting to use;
2) waiting system incident judges whether the shooting application loads;
3) if using, shooting loads, then whether power on by the electrical level judging camera that reads the output of mainboard chip output mouth, when camera does not power on, the output level value of this output port that the value of mainboard chip output mouth register rewrites then directly is set or, camera is powered on by the insert action of mainboard chip output mouth simulation camera;
4) if making a video recording not use loads, then the notifying operation system unloads the physics photographing module when list of application is sky, and the output level of control main board chip output mouth disconnects system power supply and camera USB (universal serial bus).
Whether judge described step 2) that shooting is used loads by judging the realization that whether is called of initialization function.
Further comprise in the insert action of mainboard chip output mouth simulation camera in the described step 3): the output level of control main board chip output mouth disconnects USB (universal serial bus) and system power supply; Time-delay; The output level of control main board chip output mouth is connected USB (universal serial bus) and system power supply.
Step 3) further comprises: wait for that operating system loads the physics photographing module; Judge whether loaded of physics photographing module, if loaded then continue to wait for not if loaded then upgrades list of application, and carries out load application.
The described physics photographing module whether device of loaded by operating system changes incident, and calling device Loading Control function obtains USB (universal serial bus) device name, device identification and device attribute and judges.
Described step 4) further comprises: when the shooting application did not load, the change of virtual photographing module internal counter judged whether the shooting application unloads; If the unloading would upgrade list of application, if the unloading return step 1); When being not sky, list of application returns step 1).
The present invention also provides the method for managing power supply of another kind of built-in camera, comprises step: switch is provided with step, by level height control system power supply and the disconnection of camera USB (universal serial bus) or the connection of mainboard chip output mouth output; The power supply controlled step, the level output of control main board chip output mouth, making only is the camera power supply when loading is used in shooting;
The power supply controlled step further comprises: open step: whether the response button then powers on by the electrical level judging camera that reads the output of mainboard chip output mouth when opening the camera application; When camera did not power on, then the output level of this output port of directly rewriting at mainboard chip output mouth register or by the insert action of mainboard chip output mouth simulation camera powered on camera; Close step: whether the response button, when closing the camera application, then close by the electrical level judging camera that reads the output of mainboard chip output mouth; If close electricity, then the output level of control main board chip output mouth makes system power supply and the disconnection of camera USB (universal serial bus) or notifying operation system that the physics photographing module is unloaded from operating system.
The implementation of operating system unloading physics photographing module includes: use ACPI notifying operation system closing physics photographing module; Perhaps, the function forbidding physics photographing module that uses operating system to provide; Perhaps, adopt to drive filtrator generation input and output request package, transmission stops or the information that shifts out is given the physics photographing module; Perhaps, the output level of control main board chip output mouth disconnects system power supply and camera USB (universal serial bus).
Switch is provided with in the step and further comprises: switch series is associated between system power supply and the camera USB (universal serial bus); Mainboard chip output mouth is connected with the switch control end.
Compared with prior art, the present invention has the following advantages:
Revise the hardware circuit of built-in camera equipment, at the USB interface place that camera connects, use GPIO controls the electricity of USB connector, by the control to GPIO, reach the purpose of control camera power supply, thereby prolong the battery flying power and realize that the hardware cost that needs is very low.
Can detect camera automatically whether in work by the present invention, according to the duty of camera, automatically, safely camera is removed from operating system or loads, the camera power supply is closed or opened to the announcement apparatus built-in switch, reaches the function of economize on electricity.
The user can guarantee the safety deletion in OS of camera equipment, the possibility of having avoided pressure to draw electricity can cause camera to burn with under keyboard hot key/button control power switch condition before the powered-down.Simultaneously before the powered-down, can use the camera shooting through unloading automatically or use and do certain processing after receiving closing information, strengthen usability.
Under on-keyboard hot key/button control situation, provide safe built-in power control method, do not need user intervention, no matter whether the camera power switch, and the user can both search out camera equipment in system, strengthened user experience.
Above-mentionedly either way can reach: under the situation that built-in camera is not used by the user, automatically camera is unloaded (also can close the camera power supply simultaneously) from operating system, eliminate the possibility that causes system power dissipation to increase because of the existence of camera.
Description of drawings
Fig. 1 is the method for managing power supply process flow diagram of built-in camera of the present invention.
Fig. 2 is the first embodiment of the invention process flow diagram.
Fig. 3 a, 3b are circuit diagrams of the present invention.
Fig. 4 is the second embodiment of the invention process flow diagram.
Embodiment
Please refer to shown in Figure 1ly, the method for managing power supply of built-in camera of the present invention comprises step:
Switch is provided with step, by level height control system power supply and the disconnection of camera USB (universal serial bus) or the connection of mainboard chip output mouth output;
The power supply controlled step, the level output of control main board chip output mouth, making only is the camera power supply when loading is used in shooting.
Please refer to first embodiment of power supply controlled step shown in Figure 2, comprising:
1) creates virtual photographing module (Camera Shadow), notifying operation system virtualization camera loads (just thinks that camera exists as long as Camera Shadow is loaded then operating system, virtual photographing module can be loaded when system start-up, as long as virtual module loads, operating system will be thought has picture pick-up device to exist, can not cause operating system not load photographing module like this because of camera hardware does not power on, thereby can not seek the shooting application and cause difficulty) to the user, the calling interface that described virtual photographing module provides shooting to use, if operating system is XP, then Camera Shadow uses for shooting The Component Object Model (COM) interface is provided;
Whether 2) waiting system incident is judged that shooting is used to load, if operating system is XP, the com interface that is activated and can calls Camera Shadow when using camera is used in each shooting; System event refers to that the user uses mouse, keyboard, other modes (for example: automatically perform during system start-up) etc. that shooting is used and tells;
3) if using, shooting loads, then whether power on by the electrical level judging camera that reads the output of mainboard chip output mouth, when camera does not power on, then the output level value of this output port of directly rewriting at mainboard chip output mouth register or by the insert action of mainboard chip output mouth simulation camera powers on camera;
4) if making a video recording not use loads, then the notifying operation system unloads the physics photographing module when list of application is sky, and the output level of control main board chip output mouth disconnects system power supply and camera USB (universal serial bus).
The physics photographing module, the module relevant with camera hardware only after device power, just can load, and loading procedure is controlled by OS fully.On XP, can think a USB shooting driver, direct control camera (for example :) to the reading and writing of data; Carry out communication with Camera Shadow by operating system, the concrete means of communication are realized by operating system).。
The calling interface that the interface that provides by operating system obtains Camera Shadow module is provided in shooting, thereby realizes the shooting application.
Whether judge described step 2) that shooting is used loads by judging the realization that whether is called of initialization function.The concrete method of judging whether load application load is a lot.
Method one, on XP, shooting is used the general COM of use and is visited the shooting relevant interface.For example: can obtain IWiaMi ni Drv interface by CoCreateInstance () function and QueryInterface (); After obtaining IWiaMiniDrv, the shooting application can be called IWiaMiniDrv:drvInitialize Wia and be come the initialization picture pick-up device.When this function call, just can define shooting and use loading.IWiaMiniDrv is a com interface, and internal counter is arranged.When counter became 0, expression was applied in operation without any shooting, and counter is not 0 to be exactly that relevant shooting is applied in operation.
Method two is similar with method one, but use is the Initialize () function of IStiUSD interface and IStiUSD.When this function is called, also can be used as the foundation of shooting application initializes.Whether the counter of IStiUSD can be used as has shooting to be applied in the foundation of operation.
The insert action of mainboard chip output mouth simulation camera further comprises in the step 3): the output level of control main board chip output mouth disconnects USB (universal serial bus) and system power supply; Time-delay (for example 2 seconds); The output level of control main board chip output mouth is connected USB (universal serial bus) and system power supply.
Please refer to shown in Figure 3ly, switch is provided with in the step and further comprises: switch series is associated between system power supply and the camera USB (universal serial bus); Mainboard chip output mouth is connected with the switch control end.Present embodiment mainboard chip output mouth is with GPIO (universal input/output interface is an example).GPIO can export ' 0 ' or ' 1 '.When GPIO was 0, USB1PWR had voltage and exports to the camera USB (universal serial bus); When GPIO was 1, USB1PWR did not have voltage to exist, and the camera USB (universal serial bus) does not have electricity, and vice versa.
The output level value of this output port that step 3) is directly rewritten at mainboard chip output mouth register powers on camera, with the example that is controlled to be to GPIO, just certain bit to the mainboard chip register relevant with this GPIO carries out 0 or 1 operation in the present embodiment.(ICH6) is example with South Bridge chip, and the physical address of supposing GPIO is 0x1300, and the GPIO of use is 33.The physical deflection of GPIO33 is 0x1338 so, and corresponding bit is bit1.
Control to GPIO can followingly realize:
……
mov?dx，1338h
in al，dx
or al，00000010b
out dx，al
……
Also can use the mode of ACPI to control, with reference to as follows:
OperationRegion(GPIO，SystemIo，0x1300，0x3C)
Field(GPIO，ByteAcc，NoLock，Preserve){
………
Offset(0x38)，//GPIO，Level，Bank?1
， 1，
GP33， 1，
GP34，?1，
， 5，
………
}
……
Method(_Q34)
{
If(GP33)
{
Store(0，GP33)
}
Else
{
Store(1，GP33)
}
}
Please continue with reference to Fig. 2, step 3) further comprises: wait for that operating system loads the physics photographing module;
Judge whether loaded of physics photographing module, if loaded then continue to wait for not if loaded then upgrades list of application, and carries out load application.
The described physics photographing module whether device of loaded by operating system changes incident, and calling device Loading Control function obtains USB (universal serial bus) device name, device identification and device attribute and judges.Camera shadow exists always.Can be on XP: generate a window and receive WM_DEVICECHANGE (device changes) incident that OS sends out as judging.If this incident takes place, calling device Loading Control function DeviceIoControl (...., IOCTL_USB_GET_NODE_INFORMATION, ... .) and DeviceIoControl (..., IOCTL_USB_GET_NODE_CONNECTION_INFORMATIO () N, ...) obtain USB device information, judge the physics photographing module according to title, device identification (Device ID), the device attribute of USB device and whether load and finish.
Please continue further to comprise with reference to step 4) shown in Figure 2: when the shooting application did not load, whether the judgement shooting was used and is unloaded; If the unloading would upgrade list of application, if the unloading return step 1); When being not sky, list of application returns step 1).The calling interface of unloading by Camera Shadow for example IWiaMiniDrv interface and IStiUSD interface are used in described shooting, and internal counter is arranged.Whenever open a shooting application hour counter and add 1; Otherwise shooting of every unloading/close is used hour counter and is subtracted 1, and whether the plus-minus by counter changes judges that shooting is used and unload; When counter became 0, expression was applied in operation without any shooting, and counter is not 0 to be exactly that relevant shooting is applied in operation.
Please refer to shown in Figure 4ly, second embodiment of power supply controlled step responds by hot key or button and realizes that the second embodiment specific implementation can comprise with reference to first embodiment:
Open step: whether the response button then powers on by the electrical level judging camera that reads the output of mainboard chip output mouth when opening the camera application; When camera did not power on, then the output level value of this output port of directly rewriting at mainboard chip output mouth register or by the insert action of mainboard chip output mouth simulation camera powered on camera;
Close step: whether the response button, when closing the camera application, then close by the electrical level judging camera that reads the output of mainboard chip output mouth; If close electricity, then the output level of control main board chip output mouth makes system power supply and the disconnection of camera USB (universal serial bus) or notifying operation system that the physics photographing module is removed from operating system; If close electric operating system unloading physics photographing module automatically.
Other are handled and to refer to mainly that the user can receive behind the hot key and powering on afterwards or closing some processing of electric previous crops.For example: can open the camera application software, perhaps close the camera application software.
The implementation of described operating system unloading physics photographing module includes:
Use ACPI notifying operation system closing physics photographing module, Notify (xxx, 01) for example, wherein xxx represents camera equipment; Perhaps,
Function (for example DeviceIoControl () can notify USB to drive forbidding, close port) the forbidding physics photographing module that uses operating system to provide; Perhaps,
Adopt to drive filtrator (Filter Driver) generation input and output request package (IPR), transmission stops or shifting out information (Stop/Remove) and give the physics photographing module; Perhaps,
The output level of control main board chip output mouth disconnects system power supply and camera USB (universal serial bus), if for example during GPIO 1, level drags down, and it is 0 that GPIO directly is set.
Revise the hardware circuit of built-in camera equipment, at the USB interface place that camera connects, use GPIO controls the electricity of USB connector, by the control to GPIO, reach the purpose of control camera power supply, thereby prolong the battery flying power and realize that the hardware cost that needs is very low.
Can detect camera automatically whether in work by the present invention, according to the duty of camera, automatically, safely camera is removed from operating system or loads, the camera power supply is closed or opened to the announcement apparatus built-in switch, reaches the function of economize on electricity.
The user can guarantee the safety deletion in OS of camera equipment, the possibility of having avoided pressure to draw electricity can cause camera to burn with under keyboard hot key/button control power switch condition before the powered-down.Simultaneously before the powered-down, can use the camera shooting through unloading automatically or use and do certain processing after receiving closing information, strengthen usability.
Under on-keyboard hot key/button control situation, provide safe built-in power control method, do not need user intervention, no matter whether the camera power switch, and the user can both search out camera equipment in system, strengthened user experience.
Above-mentionedly either way can reach: under the situation that built-in camera is not used by the user, automatically camera is closed the camera power supply during unloading from operation, eliminate the possibility that causes system power dissipation to increase because of the existence of camera.
In addition, the present invention also is suitable for the passive USB device except that camera, can only be passive control by system.
Claims (9)
1. the method for managing power supply of a built-in camera is characterized in that: comprise step:
Switch is provided with step, by level height control system power supply and the disconnection of camera USB (universal serial bus) or the connection of mainboard chip output mouth output;
The power supply controlled step, the level output of control main board chip output mouth, making only is the camera power supply when loading is used in shooting;
Described power supply controlled step further comprises:
1) create virtual photographing module, notifying operation system virtualization camera loads, the calling interface that described virtual photographing module provides shooting to use;
2) waiting system incident judges whether the shooting application loads;
3) if using, shooting loads, then whether power on by the electrical level judging camera that reads the output of mainboard chip output mouth, when camera does not power on, the output level value of this output port that the value of mainboard chip output mouth register rewrites then directly is set or, camera is powered on by the insert action of mainboard chip output mouth simulation camera;
4) if making a video recording not use loads, then the notifying operation system unloads the physics photographing module when list of application is sky, and the output level of control main board chip output mouth disconnects system power supply and camera USB (universal serial bus).
2. whether the method for managing power supply of built-in camera as claimed in claim 1: judging described step 2) that shooting is used loads by judging the realization that whether is called of initialization function if is characterized in that.
3. the method for managing power supply of built-in camera as claimed in claim 1 is characterized in that: the insert action of mainboard chip output mouth simulation camera further comprises in the step 3):
The output level of control main board chip output mouth disconnects USB (universal serial bus) and system power supply; Time-delay;
The output level of control main board chip output mouth is connected USB (universal serial bus) and system power supply.
4. as the method for managing power supply of claim 1,2 or 3 described built-in cameras, it is characterized in that: step 3) further comprises:
Wait for that operating system loads the physics photographing module;
Judge whether loaded of physics photographing module, if loaded then continue to wait for not if loaded then upgrades list of application, and carries out load application.
5. the method for managing power supply of built-in camera as claimed in claim 4, it is characterized in that: the physics photographing module whether device of loaded by operating system changes incident, and calling device Loading Control function obtains USB (universal serial bus) device name, device identification and device attribute and judges.
6. as the method for managing power supply of claim 1,2 or 3 described built-in cameras, it is characterized in that: step 4) further comprises: when the shooting application did not load, the change of virtual photographing module internal counter judged whether the shooting application unloads; If the unloading would upgrade list of application, if the unloading return step 1); When being not sky, list of application returns step 1).
7. the method for managing power supply of a built-in camera is characterized in that: comprise step:
Switch is provided with step, by level height control system power supply and the disconnection of camera USB (universal serial bus) or the connection of mainboard chip output mouth output;
The power supply controlled step, the level output of control main board chip output mouth, making only is the camera power supply when loading is used in shooting;
Described power supply controlled step further comprises:
Open step: whether the response button then powers on by the electrical level judging camera that reads the output of mainboard chip output mouth when opening the camera application; When camera did not power on, then the output level of this output port of directly rewriting at mainboard chip output mouth register or by the insert action of mainboard chip output mouth simulation camera powered on camera;
Close step: whether the response button, when closing the camera application, then close by the electrical level judging camera that reads the output of mainboard chip output mouth; If close electricity, then the output level of control main board chip output mouth makes system power supply and the disconnection of camera USB (universal serial bus) or notifying operation system that the physics photographing module is unloaded from operating system.
8. as the method for managing power supply of claim 1 or 7 described built-in cameras, it is characterized in that the implementation of operating system unloading physics photographing module includes:
Use ACPI notifying operation system closing physics photographing module; Perhaps,
The function forbidding physics photographing module that uses operating system to provide; Perhaps,
Adopt to drive filtrator generation input and output request package, transmission stops or the information that shifts out is given the physics photographing module; Perhaps,
The output level of control main board chip output mouth disconnects system power supply and camera USB (universal serial bus).
9. the method for managing power supply of built-in camera as claimed in claim 1 is characterized in that, switch is provided with in the step and further comprises: switch series is associated between system power supply and the camera USB (universal serial bus); Mainboard chip output mouth is connected with the switch control end.
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| CNB2005100018631A CN100472402C (en) | 2005-01-18 | 2005-01-18 | Power management method for built-in camera |
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| CNB2005100018631A CN100472402C (en) | 2005-01-18 | 2005-01-18 | Power management method for built-in camera |
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| CN100472402C true CN100472402C (en) | 2009-03-25 |
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| US11481018B2 (en) | 2018-06-28 | 2022-10-25 | Hewlett-Packard Development Company, L.P. | Method for webcam privacy protection implementation |
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| CN101465963B (en) * | 2008-12-04 | 2013-10-16 | 北京中星微电子有限公司 | Camera head, computer and network call implementing method |
| TWI482044B (en) | 2009-07-14 | 2015-04-21 | Wistron Corp | Computer device and ip camera power control method for preventing unauthorized use of a picture-taking function |
| CN101964038B (en) * | 2009-07-21 | 2016-11-23 | 纬创资通股份有限公司 | Prevent the stolen computer installation of camera function and camera power supply control method |
| CN101997963B (en) * | 2009-08-31 | 2012-11-28 | 英华达股份有限公司 | Power supply management method and system of portable communication device |
| CN104750628A (en) * | 2013-12-30 | 2015-07-01 | 上海格尔软件股份有限公司 | Method for triggering SSL logout by utilizing USB notification |
| CN103945200A (en) * | 2014-05-16 | 2014-07-23 | 安徽永安电子科技有限公司 | Power-saving method for centralized wireless video monitoring system |
| CN107786787B (en) * | 2016-08-30 | 2024-03-12 | 北京小米移动软件有限公司 | Camera and control method |
| CN108170211B (en) * | 2017-12-27 | 2021-04-06 | 上海传英信息技术有限公司 | Camera power-on driving method and electronic terminal |
| CN109600556B (en) * | 2019-02-18 | 2020-11-06 | 武汉大学 | High-quality precise panoramic imaging system and method based on single lens reflex |
| CN111581144B (en) * | 2020-03-24 | 2022-02-08 | 惠州市德赛西威智能交通技术研究院有限公司 | Vehicle-mounted camera hot-plug self-recovery method and device and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11481018B2 (en) | 2018-06-28 | 2022-10-25 | Hewlett-Packard Development Company, L.P. | Method for webcam privacy protection implementation |
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