CN1808338A - Power management method for built-in camera - Google Patents
Power management method for built-in camera Download PDFInfo
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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 invention relates to a power management method of universal serial bus equipment, in particular to a power management method of a built-in camera.
Background
With the increase of integration level of USB (Universal Serial Bus) devices with passive response of USB interfaces, for example, taking a camera as an example, more and more notebook computers provide built-in camera functions. The built-in camera can cause the system power consumption to increase, and there are two main reasons: most of the first built-in camera is a USB (1.1/2.0) interface, and the camera needs to consume electric energy even in an inoperative state. Secondly, after the system is inserted into the USB device, the CPU can be separated from the low power consumption state; therefore, after the camera is built in the notebook computer, as long as the USB device exists in the power-on state from the system perspective, the CPU never enters the low power consumption state in this case, thereby increasing the power consumption.
For USB devices, once plugged into the system. Signal output is always available on a signal wire of the USB, so that the difficulty of judging whether the USB equipment has a signal transmission state or not by modifying hardware and adding a hardware monitoring circuit is very high, and even if the method can be realized, the method is very high in cost.
The USB camera also has such a problem. The built-in camera needs to get power from the USB interface of the notebook computer, so that the built-in camera cannot control a power switch of the built-in camera according to needs, such as in a starting state. After the camera is built-in, the user can not reduce the power consumption of the whole system by plugging and unplugging the camera. The cost of the notebook computer is increased by using hardware to realize the automatic control of the camera, the hardware design of the whole notebook computer is influenced, and the realization difficulty is high. Are not user friendly, for example: if the user forgets to turn on the power supply of the camera when starting the system, the system can report errors when running the software related to the camera; if the Firmware (Firmware) turns on the camera by default when the computer is started, and a user does not use the related software of the camera, the power consumption of the system is increased, and the battery endurance is influenced.
Disclosure of Invention
The invention provides a power management method of a built-in camera, which supplies power only when a USB device works.
In order to solve the above problems, the power management method of the built-in camera of the present invention comprises the steps of: a switch setting step, wherein the power supply of the system and the universal serial bus interface of the camera are controlled to be switched off or on by the level output by the output port of the mainboard chip; and a power supply control step, namely controlling the level output of the output port of the mainboard chip to supply power to the camera only when the camera application is loaded.
The power control step further includes one of the following implementation manners:
1) creating a virtual camera module, and informing an operating system that a virtual camera is loaded, wherein the virtual camera module provides a calling interface of a camera application;
2) waiting for a system event, and judging whether the camera application is loaded or not;
3) if the camera application is loaded, judging whether the camera is powered on or not by reading the level output by the output port of the mainboard chip, and directly setting the value of the register of the output port of the mainboard chip to rewrite the output level value of the output port or simulating the insertion action of the camera through the output port of the mainboard chip to power on the camera when the camera is not powered on;
4) if the camera shooting application is not loaded, the operating system is informed to unload the physical camera shooting module when the application list is empty, and the output level of the output port of the mainboard chip is controlled to disconnect the system power supply and the universal serial bus interface of the camera.
And judging whether the camera shooting application is loaded in the step 2) is realized by judging whether an initialization function is called.
Simulating a camera insertion action at an output port of the main board chip in the step 3) further comprises: controlling the output level of the output port of the mainboard chip to disconnect the universal serial bus interface from the system power supply; delaying time; and controlling the output level of the output port of the mainboard chip to connect the universal serial bus interface with the system power supply.
Step 3) further comprises: waiting for the operating system to load the physical camera module; and judging whether the physical camera module is loaded completely, if not, continuing to wait, and if so, updating the application list and loading the application.
And whether the physical camera module is completely loaded or not is judged by calling a device loading control function to obtain the name, the identifier and the attribute of the universal serial bus interface equipment through a device change event of the operating system.
The step 4) further comprises the following steps: when the camera application is not loaded, the change of the counter inside the virtual camera module judges whether the camera application is unloaded; if uninstalled, updating the application list, and if uninstalled, returning to the step 1); return to step 1) when the application list is not empty.
Another implementation of the power control step further comprises: opening: responding to the key, and judging whether the camera is powered on or not by reading the level output by the output port of the mainboard chip when the camera application is started; when the camera is not powered on, the output level of the output port is directly rewritten in the output port register of the mainboard chip or the insertion action of the camera is simulated through the output port of the mainboard chip, so that the camera is powered on; closing: responding to the key, and judging whether the camera is powered off or not by reading the level output by the output port of the mainboard chip when the application of the camera is closed; if the power is not turned off, the output level of the output port of the main board chip is controlled to disconnect the system power supply and the universal serial bus interface of the camera or inform the operating system to remove the physical camera module from the operating system.
The implementation mode of the operating system for unloading the physical camera module comprises the following steps: informing an operating system to close the physical camera module by using the advanced configuration and power interface; or the physical camera module is forbidden by using a function provided by an operating system; or, generating an input/output request packet by adopting a driving filter, and transmitting stop or removal information to the physical camera module; or controlling the output level of the output port of the mainboard chip to disconnect the system power supply and the universal serial bus interface of the camera.
The switch setting step further comprises: the switch is connected in series between the system power supply and the universal serial bus interface of the camera; the output port of the mainboard chip is connected with the switch control end.
Compared with the prior art, the invention has the following advantages:
the hardware circuit of the built-in camera equipment is modified, the GPIO is used for controlling the power of the USB connector at the USB interface connected with the camera, and the aim of controlling the power supply of the camera is achieved by controlling the GPIO, so that the battery endurance is prolonged, and the required hardware cost is low.
The invention can automatically detect whether the camera works, automatically and safely remove or load the camera from the operating system according to the working state of the camera, and inform the built-in switch of the equipment to close or open the power supply of the camera, thereby achieving the function of saving electricity.
Under the condition that a user controls a power switch by using a hot key/button of a keyboard, the camera equipment can be ensured to be safely deleted in the OS before the power is turned off, and the possibility that the camera is burnt down due to forced power pulling is avoided. Meanwhile, before the power supply is turned off, the camera application can be automatically unloaded or the camera application can be processed to a certain extent after receiving the turn-off information, so that the usability is enhanced.
Under the condition of no keyboard hot key/button control, a safe built-in power supply control method is provided, user intervention is not needed, and no matter whether the camera power supply is switched on or off, a user can find the camera equipment in the system, so that the user experience is enhanced.
Both of the above situations can be achieved: when the built-in camera is not used by a user, the camera is automatically unloaded from the operating system (the power of the camera can also be simultaneously turned off), and the possibility of increasing the power consumption of the system due to the existence of the camera is eliminated.
Drawings
Fig. 1 is a flowchart of a power management method of a built-in camera according to the present invention.
Fig. 2 is a flow chart of a first embodiment of the present invention.
Fig. 3a, 3b are circuit diagrams of the present invention.
Fig. 4 is a flow chart of a second embodiment of the present invention.
Detailed Description
Referring to fig. 1, the power management method for a built-in camera according to the present invention includes the steps of:
a switch setting step, wherein the power supply of the system and the universal serial bus interface of the camera are controlled to be switched off or on by the level output by the output port of the mainboard chip;
and a power supply control step, namely controlling the level output of the output port of the mainboard chip to supply power to the camera only when the camera application is loaded.
Referring to fig. 2, a first embodiment of the power control step includes:
1) creating a virtual Camera module (Camera Shadow), informing an operating system that a virtual Camera is loaded (the operating system considers that the Camera exists as long as the Camera Shadow is loaded, the virtual Camera module is loaded when the system is started, and the operating system considers that a Camera device exists as long as the virtual module is loaded, so that the situation that the operating system does not load the Camera module due to the fact that Camera hardware is not powered on and the Camera module is not loaded, and difficulty is not caused for a user to find the Camera application) is avoided);
2) waiting for a system event, judging whether the Camera application is loaded, if the operating system is XP, starting each Camera application and calling a COM interface of Camera Shadow when the Camera is used; the system event refers to that a user calls the camera shooting application by using a mouse, a keyboard, other modes (for example, automatic execution during system starting) and the like;
3) if the camera application is loaded, judging whether the camera is powered on or not by reading the level output by the output port of the mainboard chip, and directly rewriting the output level value of the output port of the mainboard chip output port register or simulating the insertion action of the camera through the output port of the mainboard chip to power on the camera when the camera is not powered on;
4) if the camera shooting application is not loaded, the operating system is informed to unload the physical camera shooting module when the application list is empty, and the output level of the output port of the mainboard chip is controlled to disconnect the system power supply and the universal serial bus interface of the camera.
The physical camera module, a module related to camera hardware, is loaded only after the device is powered on, and the loading process is completely controlled by the OS. The XP can be regarded as a USB camera shooting driver program which directly operates the camera (for example, reads and writes data); and communicating with Camera Shadow through an operating system, wherein the specific communication method is realized by the operating system). .
The Camera shooting application acquires a calling interface of the Camera Shadow module through an interface provided by the operating system, so that the Camera shooting application is realized.
And judging whether the camera shooting application is loaded in the step 2) is realized by judging whether an initialization function is called. There are many specific methods for determining whether a loaded application is loaded.
First, in XP, a camera application typically uses COM to access camera related interfaces. For example: an IWiaMiniDrv interface can be obtained through a CoCreateInstance () function and a QueryInterface (); after obtaining the iwiamidrv, the camera application calls iwiamidrv: drvliwia to initialize the camera. When this function is called, it can be determined that the camera application is loaded. Iwiamimidrv is a COM interface with an internal counter. When the counter becomes 0, it indicates that no image pickup application is running, and whether the counter is 0 or the relevant image pickup application is running.
The method two is similar to the method one, but uses the ISIUSD interface and the ITIALIZE () function of ISIUSD. When this function is called, it can also be used as a basis for the initialization of the camera application. The counter of the istribud can be used as a basis for running whether the camera application exists.
The step 3) of simulating the insertion action of the camera by the output port of the mainboard chip further comprises the following steps: controlling the output level of the output port of the mainboard chip to disconnect the universal serial bus interface from the system power supply; time delay (e.g., 2 seconds); and controlling the output level of the output port of the mainboard chip to connect the universal serial bus interface with the system power supply.
Referring to fig. 3, the switch setting step further includes: the switch is connected in series between the system power supply and the universal serial bus interface of the camera; the output port of the mainboard chip is connected with the switch control end. The output port of the motherboard chip in this embodiment is a GPIO (general purpose input output interface, for example). The GPIO may output either '0' or '1'. When the GPIO is 0, the USB1PWR outputs voltage to the universal serial bus interface of the camera; when the GPIO is 1, no voltage exists in the USB1PWR, the universal serial bus interface of the camera cannot be powered, and vice versa.
And step 3) directly rewriting the output level value of the output port in the output port register of the mainboard chip to electrify the camera, wherein the control of the GPIO is taken as an example in the embodiment, and only 0 or 1 operation is carried out on a certain bit of the mainboard chip and the register related to the GPIO. Taking the south bridge chip (ICH6) as an example, assume that the physical address of GPIO is 0x1300, and the GPIO used is 33. Then the physical offset of GPIO33 is 0x1338 and the corresponding bit is bit 1.
The control of the GPIO may be implemented as follows:
...... mov dx，1338h in al，dx or al，00000010b out dx，al ...... <!-- SIPO <DP n="6"> --> <dp n="d6"/>the control can also be performed using the ACPI method, as follows: operationregister (GPIO, systemlio, 0x1300, 0x3C) Field (GPIO, ByteAcc, NoLock, Preserve) {. a.. useful.. Offset (0x38),// GPIO, Level, Bank 1, 1, GP33, 1, GP34, 1, 5,. useful.. useful. } … … Method(_Q34) { If(GP33) { Store(0，GP33) } Else { Store(1，GP33) } }
With reference to fig. 2, step 3) further includes: waiting for the operating system to load the physical camera module;
and judging whether the physical camera module is loaded completely, if not, continuing to wait, and if so, updating the application list and loading the application.
And whether the physical camera module is completely loaded or not is judged by calling a device loading control function to obtain the name, the identifier and the attribute of the universal serial bus interface equipment through a device change event of the operating system. The Camera shadow is always present. On XP can be judged as follows: a window is generated to receive WM _ DEVICECHANGE (device change) events sent by the OS. If the event happens, calling Device loads control functions such as Device control (IOCTL, IOCTL _ USB _ GET _ NODE _ INFORMATION), Device IOControl (IOCTL, IOCTL _ USB _ GET _ NODE _ CONNECTION _ INFORMATION) to acquire USB Device INFORMATION, and judging whether the physical camera module is completely loaded according to the name of the USB Device, the Device identification (Device ID) and the Device attribute.
Please refer to fig. 2, wherein step 4) further includes: judging whether the camera application is unloaded or not when the camera application is not loaded; if uninstalled, updating the application list, and if uninstalled, returning to the step 1); return to step 1) when the application list is not empty. The Camera application offload calls via Camera Shadow interfaces such as the IWiaMiniDrv interface and the istusd interface, with internal counters. Adding 1 to a counter every time one camera application is opened; otherwise, the counter is decreased by 1 when one camera application is unloaded/closed, and whether the camera application is unloaded or not is judged through the change of the increase and decrease of the counter; when the counter becomes 0, it indicates that no image pickup application is running, and whether the counter is 0 or the relevant image pickup application is running.
Referring to fig. 4, a second embodiment of the power control step is realized by a hot key or a button response, and the specific implementation of the second embodiment may refer to the first embodiment, and includes:
opening: responding to the key, and judging whether the camera is powered on or not by reading the level output by the output port of the mainboard chip when the camera application is started; when the camera is not powered on, directly rewriting the output level value of the output port in the output port register of the mainboard chip or simulating the insertion action of the camera through the output port of the mainboard chip to power on the camera;
closing: responding to the key, and judging whether the camera is powered off or not by reading the level output by the output port of the mainboard chip when the application of the camera is closed; if the power is not turned off, controlling the output level of the output port of the mainboard chip to disconnect the system power supply and the universal serial bus interface of the camera or informing the operating system to remove the physical camera module from the operating system; and if the power is off, the operating system can automatically unload the physical camera module.
Other processing mainly refers to some processing which is performed after the user receives the hot key and powers on or powers off. For example: the camera application may be turned on or turned off.
The implementation mode of the operating system for unloading the physical camera module comprises the following steps:
using a high-level configuration and power interface to Notify an operating system to turn off a physical camera module, such as Notify (xxx, 01), where xxx denotes a camera device; or,
disabling the physical camera module using a function provided by the operating system (e.g., DeviceIoControl () can notify the USB driver to disable, close the port); or,
generating an input/output request packet (IPR) by adopting a drive Filter (Filter Driver), and transmitting Stop or removal information (Stop/Remove) to a physical camera module; or,
and controlling the output level of the output port of the mainboard chip to disconnect the system power supply and the universal serial bus interface of the camera, for example, if the GPIO1 is detected, the level is pulled low, and the GPIO is directly set to be 0.
The hardware circuit of the built-in camera equipment is modified, the GPIO is used for controlling the power of the USB connector at the USB interface connected with the camera, and the aim of controlling the power supply of the camera is achieved by controlling the GPIO, so that the battery endurance is prolonged, and the required hardware cost is low.
The invention can automatically detect whether the camera works, automatically and safely remove or load the camera from the operating system according to the working state of the camera, and inform the built-in switch of the equipment to close or open the power supply of the camera, thereby achieving the function of saving electricity.
Under the condition that a user controls a power switch by using a hot key/button of a keyboard, the camera equipment can be ensured to be safely deleted in the OS before the power is turned off, and the possibility that the camera is burnt down due to forced power pulling is avoided. Meanwhile, before the power supply is turned off, the camera application can be automatically unloaded or the camera application can be processed to a certain extent after receiving the turn-off information, so that the usability is enhanced.
Under the condition of no keyboard hot key/button control, a safe built-in power supply control method is provided, user intervention is not needed, and no matter whether the camera power supply is switched on or off, a user can find the camera equipment in the system, so that the user experience is enhanced.
Both of the above situations can be achieved: under the condition that the built-in camera is not used by a user, the power supply of the camera is turned off when the camera is automatically unloaded from the operation, and the possibility that the power consumption of the system is increased due to the existence of the camera is eliminated.
In addition, the invention is also suitable for passive USB devices except cameras, and only can be passively controlled by the system.
Claims (10)
1. A power management method of a built-in camera is characterized in that: the method comprises the following steps:
a switch setting step, wherein the power supply of the system and the universal serial bus interface of the camera are controlled to be switched off or on by the level output by the output port of the mainboard chip;
and a power supply control step, namely controlling the level output of the output port of the mainboard chip to supply power to the camera only when the camera application is loaded.
2. The power management method of the built-in camera according to claim 1, characterized in that: the power control step further comprises:
1) creating a virtual camera module, and informing an operating system that a virtual camera is loaded, wherein the virtual camera module provides a calling interface of a camera application;
2) waiting for a system event, and judging whether the camera application is loaded or not;
3) if the camera application is loaded, judging whether the camera is powered on or not by reading the level output by the output port of the mainboard chip, and directly setting the value of the register of the output port of the mainboard chip to rewrite the output level value of the output port or simulating the insertion action of the camera through the output port of the mainboard chip to power on the camera when the camera is not powered on;
4) if the camera shooting application is not loaded, the operating system is informed to unload the physical camera shooting module when the application list is empty, and the output level of the output port of the mainboard chip is controlled to disconnect the system power supply and the universal serial bus interface of the camera.
3. The power management method of the built-in camera according to claim 2, characterized in that: and judging whether the camera shooting application is loaded in the step 2) is realized by judging whether an initialization function is called.
4. The power management method of the built-in camera according to claim 2, characterized in that: the step 3) of simulating the insertion action of the camera by the output port of the mainboard chip further comprises the following steps:
controlling the output level of the output port of the mainboard chip to disconnect the universal serial bus interface from the system power supply;
delaying time;
and controlling the output level of the output port of the mainboard chip to connect the universal serial bus interface with the system power supply.
5. The power management method of the built-in camera head according to claim 2, 3 or 4, characterized in that: step 3) further comprises:
waiting for the operating system to load the physical camera module;
and judging whether the physical camera module is loaded completely, if not, continuing to wait, and if so, updating the application list and loading the application.
6. The power management method of the built-in camera according to claim 5, characterized in that: and if the physical camera module is completely loaded, changing an event through a device of the operating system, and calling a device loading control function to obtain the name, the identifier and the attribute of the universal serial bus interface equipment to judge.
7. The power management method of the built-in camera head according to claim 2, 3 or 4, characterized in that: step 4) further comprises: when the camera application is not loaded, the change of the counter inside the virtual camera module judges whether the camera application is unloaded; if uninstalled, updating the application list, and if uninstalled, returning to the step 1); return to step 1) when the application list is not empty.
8. The power management method of the built-in camera according to claim 1, characterized in that: the power control step further comprises:
opening: responding to the key, and judging whether the camera is powered on or not by reading the level output by the output port of the mainboard chip when the camera application is started; when the camera is not powered on, the output level of the output port is directly rewritten in the output port register of the mainboard chip or the insertion action of the camera is simulated through the output port of the mainboard chip, so that the camera is powered on;
closing: responding to the key, and judging whether the camera is powered off or not by reading the level output by the output port of the mainboard chip when the application of the camera is closed; if the power is not turned off, the output level of the output port of the main board chip is controlled to disconnect the system power supply and the universal serial bus interface of the camera or inform the operating system to remove the physical camera module from the operating system.
9. The power management method of the built-in camera according to claim 2 or 8, wherein the implementation manner of the operating system unloading the physical camera module includes:
informing an operating system to close the physical camera module by using the advanced configuration and power interface; or,
disabling the physical camera module using a function provided by the operating system; or,
generating an input/output request packet by adopting a driving filter, and transmitting stop or removal information to a physical camera module; or,
and controlling the output level of the output port of the mainboard chip to disconnect the system power supply and the universal serial bus interface of the camera.
10. The power management method of the built-in camera according to claim 1, wherein the switch setting step further comprises: the switch is connected in series between the system power supply and the universal serial bus interface of the camera;
the output port of the mainboard chip is connected with the switch control end.
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| CN107786787A (en) * | 2016-08-30 | 2018-03-09 | 北京小米移动软件有限公司 | Camera and control method |
| CN107786787B (en) * | 2016-08-30 | 2024-03-12 | 北京小米移动软件有限公司 | Camera and control method |
| CN108170211A (en) * | 2017-12-27 | 2018-06-15 | 上海传英信息技术有限公司 | Electric drive method and electric terminal on camera |
| 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 |
| CN109600556A (en) * | 2019-02-18 | 2019-04-09 | 武汉大学 | A kind of high quality precision omnidirectional imaging system and method based on slr camera |
| CN111581144A (en) * | 2020-03-24 | 2020-08-25 | 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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