JP2010152531A - Control of apparatus corresponding to prescribed interface and having a plurality of operation modes - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress occurrence of trouble of operation, in an apparatus corresponding to a prescribed interface needing to notify a current consumption value from a device to a host and having a plurality of operation modes. <P>SOLUTION: The apparatus includes: a storage part for storing a plurality of pieces of mode information each indicating a maximum current consumption value in each of the plurality of operation modes; an information provision part for returning the mode information according to an information provision request from the host; and a mode setting part for setting one of the plurality of operation modes as an effective operation mode according to designation based on the mode information by the host. The mode setting part sets a first operation mode wherein the maximum current consumption value is not more than a prescribed reference current value capable of being supplied by an optional host as the effective operation mode when starting connection with the host. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for controlling a device corresponding to a predetermined interface and having a plurality of operation modes.

  Devices (hereinafter also referred to as “USB devices”) that support a USB interface such as a USB mouse and a USB memory are widely used. A USB device can receive power supply from a USB interface host (hereinafter also referred to as “USB host”) such as a personal computer via a USB bus. The USB device has a configuration descriptor that defines the maximum current consumption value, and returns a configuration descriptor in response to a request from the USB host at the time of connection start processing between the USB device and the USB host called enumeration. Thus, the maximum current consumption value is notified to the USB host.

  The USB standard requires that the USB host be able to supply at least 100 milliamperes of current to the USB device. As long as this requirement is satisfied, the suppliable current value of the USB host can be arbitrarily set. For example, there are a USB host that can supply only a current of up to 100 milliamperes and a USB host that can supply a current of up to 500 milliamperes. When the maximum current consumption value of the USB device exceeds the supplyable current value of the USB host, power supply from the USB host to the USB device is rejected (see, for example, Patent Document 1).

  On the other hand, some USB devices have a plurality of operation modes and can operate while switching the operation modes. The maximum current consumption value in each operation mode is defined in the configuration descriptor corresponding to each operation mode (see, for example, Patent Document 2).

JP-A-2005-278110 JP 2007-72907 A

  In a USB device having a plurality of operation modes, there may be a problem in operation depending on the relationship between the maximum current consumption value in each operation mode and the suppliable current value of the USB host.

  Such a problem is not limited to a device compatible with the USB interface, and is a problem common to devices having a plurality of operation modes corresponding to a predetermined interface that requires a current value to be notified from the device to the host. .

  The present invention has been made to solve the above-described conventional problems, and in an apparatus having a plurality of operation modes corresponding to a predetermined interface that requires a current consumption value to be notified from a device to a host. The purpose is to suppress the occurrence of defects.

  In order to solve at least a part of the above problems, the present invention can be realized as the following forms or application examples.

[Application Example 1] An apparatus having a plurality of operation modes corresponding to a predetermined interface that requires a current consumption value to be notified from a device to a host,
A storage unit for storing a plurality of mode information indicating a maximum current consumption value in each of the plurality of operation modes;
An information providing unit that returns the mode information in response to an information provision request from the host;
A mode setting unit that sets one of the plurality of operation modes as an effective operation mode in accordance with a designation based on the mode information by the host, wherein a maximum current consumption value is arbitrary at the start of connection with the host A mode setting unit that sets the first operation mode that is equal to or lower than a predetermined reference current value that can be supplied by the host as the effective operation mode.

  In this apparatus, when the connection with the host is started, the first operation mode whose maximum current consumption value is equal to or less than a predetermined reference current value that can be supplied by any host is set as an effective operation mode. Occurrence of malfunctions at the start of connection can be suppressed.

Application Example 2 The apparatus according to Application Example 1, further including:
An operation unit for receiving an instruction to switch the effective operation mode by the user;
The mode setting unit receives the switching instruction from the first operation mode to the second operation mode in which the maximum current consumption value is larger than the reference current value, and when the host has made the designation. An apparatus for setting the second operation mode as the effective operation mode.

  In this apparatus, when an instruction to switch from the first operation mode to the second operation mode in which the maximum current consumption value is larger than the reference current value is received and designated by the host, the second operation mode is Since the operation mode is set as an effective operation mode, it is possible to suppress the occurrence of an operation failure caused by the operation mode switching.

Application Example 3 The apparatus according to Application Example 2,
The mode setting unit, when receiving the switching instruction, sets the interface to a state in which the host can issue the information provision request.

  In this apparatus, when an operation mode switching instruction is received, the interface is set to a state in which an information provision request is issued to the host, and thereafter, mode information is returned according to the information provision request from the host. The effective operation mode is set in accordance with the specification based on the mode information by the host. Therefore, in this device, it is possible to suppress the occurrence of operational defects.

Application Example 4 The apparatus according to Application Example 2 or Application Example 3,
When the host cannot supply the maximum current consumption of the second operation mode and the second operation mode cannot be designated as the effective operation mode, the mode setting unit sets the first operation mode to the first operation mode. The device to set as a valid operating mode.

  In this apparatus, when the host cannot supply the maximum current consumption in the second operation mode and the second operation mode cannot be designated as an effective operation mode, the first current consumption value is equal to or less than the reference current value. Since the operation mode is set as an effective operation mode, it is possible to suppress the occurrence of an operation defect associated with the switching of the operation mode.

Application Example 5 The apparatus according to any one of Application Example 2 to Application Example 4,
The first operation mode is a mode for providing a user instruction input function,
The apparatus in which the second operation mode is a mode for providing an image input function.

  In this apparatus, in the apparatus having the operation mode that provides the user instruction input function and the operation mode that provides the image input function, it is possible to suppress the occurrence of malfunction of the operation.

Application Example 6 The apparatus according to any one of Application Example 1 to Application Example 5,
The interface is a USB interface;
The apparatus wherein the reference current value is 100 milliamps.

  In this device, it is possible to suppress the occurrence of malfunctions in the device corresponding to the USB interface.

  The present invention can be realized in various modes. For example, a device corresponding to a predetermined interface, a control method for the device, a computer program for realizing the function of the method or the device, and the computer It can be realized in the form of a recording medium on which the program is recorded.

Next, embodiments of the present invention will be described in the following order based on examples.
A. Example:
A-1. Device configuration:
A-2. Enumeration processing:
A-3. Switching process:
B. Variation:

A. Example:
A-1. Device configuration:
FIG. 1 is an explanatory diagram showing an appearance of a mouse scanner 100 according to an embodiment of the present invention. FIG. 2 is a block diagram showing a functional configuration of the computer system 10 including the mouse scanner 100. As shown in FIG. 2, the computer system 10 includes a mouse scanner 100 and a personal computer (hereinafter also referred to as “PC”) 200.

  The mouse scanner 100 of this embodiment has a mouse function as a user instruction input device and an image scanner function as an image reading device (image input device), and provides a mouse mode that provides a mouse function and a scanner that provides an image scanner function. It operates while switching the operation mode between modes. The mouse mode corresponds to the first operation mode in the present invention, and the scanner mode corresponds to the second operation mode in the present invention.

  The mouse scanner 100 of this embodiment is a device that supports a USB interface. The mouse scanner 100 includes a mouse mechanism 120 that realizes a mouse function, a scanner mechanism 130 that realizes an image scanner function, an operation unit 140 such as buttons and wheels, and a USB interface (USB I / F) 150 including a device controller 152. , And a control unit 110 that controls each of these elements. The PC 200 has a USB interface (USB I / F) 210 including a host controller 212. The mouse scanner 100 is connected to the PC 200 by inserting a plug (not shown) provided at the tip of the USB cable 160 connected to the USB interface 150 into a port (not shown) provided in the USB interface 210 of the PC 200. Connected. In this state, the PC 200 functions as a USB host, and the mouse scanner 100 functions as a USB device.

  The mouse mechanism 120 of the mouse scanner 100 includes a position sensor 122 that detects the position of the mouse scanner 100. The position sensor 122 outputs a position signal indicating the position of the mouse scanner 100 at a predetermined timing. During operation in the mouse mode, the mouse scanner 100 functions as a mouse using the position signal and a signal detected by the user to operate the operation unit 140 under the control of the control unit 110.

  The scanner mechanism 130 of the mouse scanner 100 includes a CMOS sensor 132 as an image sensor and an LED 134 as a light source, and images a subject facing a window (not shown) provided on the bottom surface of the mouse scanner 100. Get the signal. During operation in the scanner mode, the mouse scanner 100 uses the image signal, a signal detected by the user to operate the operation unit 140, and a position signal output from the position sensor 122 under the control of the control unit 110. Functions as an image scanner.

  The operation unit 140 includes a changeover switch 142 that receives an operation mode switching instruction from the user. In the mouse scanner 100 of this embodiment, when the changeover switch 142 is pressed by the user during the operation in the mouse mode, the operation mode switching process from the mouse mode to the scanner mode is executed. On the other hand, when the changeover switch 142 is pressed by the user during the operation in the scanner mode, the operation mode switching process from the scanner mode to the mouse mode is executed.

  The device controller 152 of the mouse scanner 100 validates one of the operation modes of the mouse scanner 100 and the information provider 154 that returns a descriptor in response to a command (information provision request) from the PC 200 as a USB host. It has a mode setting unit 156 that sets the operation mode, and a storage unit 158 that stores descriptors such as a device descriptor DD and a configuration descriptor CD.

  The device descriptor DD includes basic information about the entire mouse scanner 100 as a USB device. For example, the device descriptor DD indicates the number of configurations (operation modes) of the mouse scanner 100 in addition to the device class code, vendor ID, and product ID. It stipulates. The configuration descriptor CD includes information related to the configuration (operation mode) of the mouse scanner 100, and defines, for example, each maximum current consumption value in the operation mode.

  FIG. 3 is an explanatory diagram showing an example of the configuration descriptor CD that the device controller 152 has. In the present embodiment, three configuration descriptors CD shown in FIGS. 3A to 3C are stored in the storage unit 158 of the device controller 152. The configuration descriptor CD corresponds to mode information in the present invention.

  The configuration descriptor CD1 shown in FIG. 3A defines the configuration 1 corresponding to the mouse mode. In this configuration descriptor CDl, the maximum current consumption value at offset 8 is “32h”. In the USB standard, the offset 8 of the configuration descriptor CD is determined to indicate a half of the maximum current consumption value, and “32h” represents 100 milliamperes. Therefore, the maximum current consumption value in the mouse mode (configuration 1) is 100 milliamperes. Since the maximum current consumption value in the mouse mode is smaller than the maximum current consumption value in the scanner mode to be described later, this configuration 1 is also expressed as “low power” in this specification.

  In the USB standard, the USB host is required to be able to supply a current of at least 100 milliamperes to the USB device. In this specification, this current value (100 milliamperes) is also referred to as a reference current value. The mouse mode is an operation mode in which the maximum current consumption value is equal to or less than the reference current value.

  The configuration descriptor CDh shown in FIG. 3B defines the configuration 2 corresponding to the scanner mode. In this configuration descriptor CDh, since the maximum current consumption value at offset 8 is “FAh”, the maximum current consumption value in the scanner mode (configuration 2) is 500 milliamperes. Since the maximum current consumption value in the scanner mode is larger than the maximum current consumption value in the mouse mode, this configuration 2 is also expressed as “high power” in this specification. The scanner mode is an operation mode in which the maximum current consumption value is larger than the reference current value.

  The configuration descriptor CDa shown in FIG. 3C defines the configuration 3 corresponding to the alternative mode. The alternative mode is a third operation mode that is neither the mouse mode nor the scanner mode. In this configuration descriptor CDa, the maximum current consumption value at offset 8 is “32h”, so the maximum current consumption value in the alternative mode (configuration 3) is 100 milliamperes as in the mouse mode. In this specification, this configuration 3 is also expressed as “alternate”. The alternative mode is an operation mode in which the maximum current consumption value is equal to or less than the reference current value.

  In addition to the device descriptor DD and the configuration descriptor CD, the storage unit 158 (FIG. 2) of the device controller 152 of the mouse scanner 100 includes an interface descriptor including information on an interface constituting each configuration, and each interface. An endpoint descriptor including information on the endpoints that constitutes is stored.

A-2. Enumeration Processing FIG. 4 is a flowchart showing the flow of enumeration processing in the computer system 10. The enumeration process is a connection start process between the mouse scanner 100 as a USB device and the PC 200 as a USB host. Specifically, the USB host knows about the USB device and communicates between the USB host and the USB device. This is a process of exchanging information so that it becomes possible.

  In step S110 (FIG. 4), the PC 200 as the USB host determines whether a USB device is detected. The host controller 212 (FIG. 2) of the PC 200 polls the port of the USB interface 210 and monitors the attachment / detachment of the USB device (plug) to the port. If the mouse scanner 100 is physically connected to the PC 200 when the computer system 10 is activated, or if the mouse scanner 100 is newly physically connected to the PC 200 after the computer system 10 is activated, the PC 200 causes the USB device to be connected. Is detected.

  When the USB device is detected, the host controller 212 of the PC 200 issues a command for requesting address setting to the detected USB device (mouse scanner 100) (step S120). As a result, a unique address is assigned to the mouse scanner 100 as a USB device.

  Next, the host controller 212 of the PC 200 issues a command for requesting the device descriptor DD to the mouse scanner 100 using the assigned new address (step S130). Upon receiving the command, the device controller 152 of the mouse scanner 100 causes the information providing unit 154 to return the device descriptor DD (FIG. 2) to the host controller 212 (step S140).

  The host controller 212 of the PC 200 that has received the device descriptor DD issues a command for requesting the configuration descriptor CD to the mouse scanner 100 (step S150). Upon receiving the command, the device controller 152 of the mouse scanner 100 causes the information providing unit 154 to return the configuration descriptor CD (FIG. 2) to the host controller 212 (step S160). At this time, the information providing unit 154 transfers the configuration descriptor CD so that the configuration 1 corresponding to the mouse mode is selected by the USB host. For example, the configuration descriptor CDl (FIG. 3A) of the configuration 1 corresponding to the mouse mode may be transferred at the head, or information specifying the configuration 1 corresponding to the mouse mode is added. The configuration descriptor CD may be transferred, or only the configuration descriptor CD1 of the configuration 1 corresponding to the mouse mode may be transferred. At this time, the interface descriptor and the endpoint descriptor subordinate to the transferred configuration descriptor CD are similarly transferred to the host controller 212. Through the processing in steps S130 to S160, information about the mouse scanner 100 as the USB device is acquired by the PC 200 as the USB host.

  In step S170, the PC 200 allocates and loads an optimal device driver for the mouse scanner 100 as a USB device based on the acquired descriptor. In step S180, the host controller 212 of the PC 200 selects and designates configuration 1 (low power) corresponding to the mouse mode based on the acquired descriptor, and issues a command for requesting configuration setting to the mouse scanner 100. Issue. Upon receiving the command, the mode setting unit 156 (FIG. 2) of the device controller 152 of the mouse scanner 100 sets the mouse mode as an effective operation mode by enabling (active) the configuration 1 (low power) ( Step S190). As a result, the mouse scanner 100 as the USB device becomes operable in the mouse mode.

  As described above, in the enumeration process, the mouse mode, which is an operation mode in which the maximum current consumption value is less than the current value (reference current value) that can be supplied by any USB host, is set as an effective operation mode. Is done. Therefore, the mouse scanner 100 according to the present embodiment is not denied power supply by the PC 200 as the USB host in the enumeration process. Therefore, in the mouse scanner 100 of the present embodiment, occurrence of malfunctions in the enumeration process is suppressed.

A-3. Switching process:
FIG. 5 is a flowchart showing a flow of switching processing for switching the operation mode from the mouse mode to the scanner mode. When the user presses the changeover switch 142 (FIG. 2) (switching instruction) is detected during operation in the mouse mode (step S210: Yes), the device controller 152 of the mouse scanner 100 resets the data line of the USB bus. The state is set (the state where both the D + line and the D− line are low) (step S220). The reset state of the USB bus is a state in which the USB host is allowed to execute re-enumeration including issuing a descriptor request command.

  The host controller 212 (FIG. 2) of the PC 200 monitors the state of the USB bus. When the host controller 212 detects the reset state of the USB bus, the PC 200 ends the device driver (step S230). Further, since the USB bus has been reset, the host controller 212 detects the mouse scanner 100 as a USB device again and executes re-enumeration (step S240). That is, the host controller 212 of the PC 200 issues a command for requesting the configuration descriptor CD to the mouse scanner 100 as a USB device (step S250). In the present embodiment, the description is made assuming that the address of the mouse scanner 100 and the transferred device descriptor DD set in the initial enumeration process (FIG. 4) are maintained, but the address setting request (FIG. The configuration descriptor request may be issued after the step S120 in FIG. 4 or the device descriptor request (step S130 in FIG. 4) is issued.

  Upon receiving the command requesting the configuration descriptor CD, the device controller 152 of the mouse scanner 100 causes the information providing unit 154 to return the configuration descriptor CD (FIG. 2) to the host controller 212 (step S260). At this time, the information providing unit 154 transfers the configuration descriptor CD so that the configuration 2 corresponding to the scanner mode is selected by the USB host. For example, the configuration descriptor CDh (FIG. 3B) of the configuration 2 corresponding to the scanner mode may be transferred at the head, or information specifying the configuration 2 corresponding to the scanner mode is added. The configuration descriptor CD may be transferred, or only the configuration descriptor CDh of the configuration 2 corresponding to the scanner mode may be transferred. At this time, the interface descriptor and the endpoint descriptor subordinate to the transferred configuration descriptor CD are similarly transferred to the host controller 212.

  In step S270, the PC 200 allocates and loads an optimal device driver for the mouse scanner 100 as a USB device based on the acquired descriptor. In step S280, the host controller 212 of the PC 200 determines whether or not a maximum current of 500 milliamperes can be supplied as bus power to the USB bus. If it is determined in step S280 that supply is possible, the host controller 212 of the PC 200 selects and designates configuration 2 (high power) corresponding to the scanner mode based on the acquired descriptor for the mouse scanner 100, A command for requesting configuration setting is issued (step S290). The mode setting unit 156 of the device controller 152 of the mouse scanner 100 that has received the command sets the scanner mode as a valid operation mode by enabling the configuration 2 (high power) (step S300). Thereby, the operation mode of the mouse scanner 100 as the USB device is changed from the mouse mode to the scanner mode.

  On the other hand, if it is determined in step S280 that supply is not possible, the host controller 212 of the PC 200 selects / designates the configuration 3 (alternate) corresponding to the alternative mode for the mouse scanner 100, and sets the configuration. A command for requesting setting is issued (step S320). Upon receiving the command, the mode setting unit 156 of the device controller 152 of the mouse scanner 100 sets configuration 3 (alternate) to valid (active) (step S330). As a result, the mouse scanner 100 as the USB device becomes an alternative mode that is neither the mouse mode nor the scanner mode.

  Subsequently, the host controller 212 of the PC 200 selects and designates configuration 1 (low power) corresponding to the mouse mode to the mouse scanner 100, and issues a command for requesting configuration setting (step S340). The mode setting unit 156 of the device controller 152 of the mouse scanner 100 that has received the command sets the mouse mode as an effective operation mode by enabling configuration 1 (low power) (step S350). As a result, the mouse scanner 100 as a USB device returns to the mouse mode without switching to the scanner mode.

  In step S360, the PC 200 displays on a display (not shown) that a high-power device with a maximum current consumption value of 500 mA is not supported as in the scanner mode. This allows the user to recognize that the mouse scanner 100 cannot be operated in the scanner mode under the PC 200.

  FIG. 6 is a flowchart showing a flow of switching processing for switching the operation mode from the scanner mode to the mouse mode. As described above, since the maximum current consumption in the mouse mode of the mouse scanner 100 is 100 milliamperes, switching to the mouse mode can be performed regardless of the current that can be supplied by the USB host.

  When the user presses the changeover switch 142 (FIG. 2) (switching instruction) is detected during operation in the scanner mode (step S410: Yes), the device controller 152 of the mouse scanner 100 resets the data line of the USB bus. A state is set (a state in which both the D + line and the D− line are low) (step S420).

  The host controller 212 (FIG. 2) of the PC 200 monitors the state of the USB bus, and when the host controller 212 detects the reset state of the USB bus, the PC 200 ends the device driver (step S430). Further, since the USB bus has been reset, the host controller 212 detects the mouse scanner 100 as a USB device again and executes re-enumeration (step S440). That is, the host controller 212 of the PC 200 issues a command for requesting the configuration descriptor CD to the mouse scanner 100 as a USB device (step S450). Note that the configuration descriptor request may be issued after an address setting request (step S120 in FIG. 4) or a device descriptor request (step S130 in FIG. 4) is issued again. It is the same as the processing.

  The device controller 152 of the mouse scanner 100 that has received the command requesting the configuration descriptor CD causes the information providing unit 154 to return the configuration descriptor CD (FIG. 2) to the host controller 212 (step S460). At this time, the information providing unit 154 transfers the configuration descriptor CD so that the configuration 1 corresponding to the mouse mode is selected by the USB host. At this time, the interface descriptor and the endpoint descriptor subordinate to the transferred configuration descriptor CD are similarly transferred to the host controller 212.

  In step S470, the PC 200 allocates and loads an optimal device driver for the mouse scanner 100 as a USB device based on the acquired descriptor. Thereafter, the host controller 212 of the PC 200 selects and designates the configuration 1 (low power) corresponding to the mouse mode based on the acquired descriptor, and issues a command for requesting configuration setting to the mouse scanner 100. (Step S480). The mode setting unit 156 of the device controller 152 of the mouse scanner 100 that has received the command sets the mouse mode as a valid operation mode by enabling the configuration 1 (low power) (step S490). As a result, the operation mode of the mouse scanner 100 as the USB device is changed from the scanner mode to the mouse mode.

  As described above, the instruction for switching from the mouse mode to the scanner mode (FIG. 5) is received, and the PC 200 designates the scanner mode by assuming that the PC 200 can supply the maximum current consumption value (500 mA) in the scanner mode. If there is, the scanner mode is set as an effective operation mode. On the other hand, even if an instruction to switch from the mouse mode to the scanner mode (FIG. 5) is received, the mouse mode is designated by the PC 200 if the PC 200 cannot supply the maximum current consumption value of the scanner mode. The mode is set as a valid operation mode. When an instruction to switch from the scanner mode to the mouse mode (FIG. 6) is received, the PC 200 can always supply the maximum current consumption value (100 mA) of the mouse mode. According to the specification, the mouse mode is set as an effective operation mode. Therefore, in the mouse scanner 100 according to the present embodiment, the occurrence of malfunctions associated with the switching of the operation mode is suppressed regardless of the suppliable current value of the PC 200 as the USB host.

B. Variation:
The present invention is not limited to the above-described examples and embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

B-1. Modification 1:
In the above-described embodiment, the mouse scanner 100 has been described as an example. However, the present invention is not limited to the mouse scanner 100, and can be applied to a general apparatus corresponding to an interface that requires a device to notify a current consumption value from a device. . In addition, the present invention is not limited to the number of operation modes and types of operation modes (a mouse mode that provides a mouse function or a scanner mode that provides an image scanner function), and has a plurality of operation modes that provide arbitrary functions. Applicable to the device. For example, the present invention can be applied to an apparatus having a camera mode that provides a Web camera function, an audio mode that provides an audio function, or the like in addition to or instead of the mouse mode and the scanner mode.

B-2. Modification 2:
In the above embodiment, the mouse mode is set as an effective operation mode in the enumeration process, but the operation mode set as an effective operation mode in the enumeration process has a maximum current consumption value of the USB host. Other operation modes may be used as long as the operation mode is equal to or lower than the reference current value (100 mA). For example, when the mouse scanner 100 has a third operation mode in which the maximum current consumption is 32 milliamperes in addition to the mouse mode and the scanner mode, the third operation mode is set in the enumeration process. It may be set as an effective operation mode, or even in this case, the mouse mode may be set as an effective operation mode.

B-3. Modification 3:
The configuration of the computer system 10 in the above embodiment is merely an example, and the configuration of the computer system 10 can be variously changed. For example, the scanner mechanism 130 may include an image sensor other than the CMOS sensor 132 and a light source other than the LED 134. Further, the contents of the device descriptor DD and the configuration descriptor CD are merely examples, and these contents can be variously changed.

B-4. Modification 4:
The processing contents of the enumeration process (FIG. 4) and the switching process (FIGS. 5 and 6) in the above embodiment are merely examples, and these processing contents can be variously changed. For example, in the enumeration process, a process for detecting the port state or a process for detecting the data transfer speed of the device may be performed.

B-5. Modification 5:
In the above embodiment, a part of the configuration realized by hardware may be replaced with software, and conversely, a part of the configuration realized by software may be replaced by hardware.

  In addition, when part or all of the functions of the present invention are realized by software, the software (computer program) can be provided in a form stored in a computer-readable recording medium. The computer-readable recording medium is not limited to a portable recording medium such as a flexible disk or a CD-ROM, but is fixed to an internal storage device in the computer such as various RAMs and ROMs, or a computer such as a hard disk. Including external storage devices.

It is explanatory drawing which shows the external appearance of the mouse scanner 100 in the Example of this invention. 1 is a block diagram showing a functional configuration of a computer system 10 including a mouse scanner 100. FIG. It is explanatory drawing which shows an example of the configuration descriptor CD which the device controller 152 has. 4 is a flowchart showing a flow of enumeration processing in the computer system 10. It is a flowchart which shows the flow of the switching process which switches an operation mode from a mouse mode to a scanner mode. It is a flowchart which shows the flow of the switching process which switches an operation mode from scanner mode to mouse mode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Computer system 100 ... Mouse scanner 110 ... Control part 120 ... Mouse mechanism 122 ... Position sensor 130 ... Scanner mechanism 132 ... CMOS sensor 134 ... LED
DESCRIPTION OF SYMBOLS 140 ... Operation part 142 ... Changeover switch 150 ... USB interface 152 ... Device controller 154 ... Information provision part 156 ... Mode setting part 158 ... Memory | storage part 160 ... USB cable 200 ... PC
210 ... USB interface 212 ... Host controller

Claims (8)

A device having a plurality of operation modes corresponding to a predetermined interface that requires notification of a current consumption value from the device to the host,
A storage unit for storing a plurality of mode information indicating a maximum current consumption value in each of the plurality of operation modes;
An information providing unit that returns the mode information in response to an information provision request from the host;
A mode setting unit that sets one of the plurality of operation modes as an effective operation mode in accordance with a designation based on the mode information by the host, wherein a maximum current consumption value is arbitrary at the start of connection with the host A mode setting unit that sets the first operation mode that is equal to or lower than a predetermined reference current value that can be supplied by the host as the effective operation mode. The apparatus of claim 1, further comprising:
An operation unit for receiving an instruction to switch the effective operation mode by the user;
The mode setting unit receives the switching instruction from the first operation mode to the second operation mode in which the maximum current consumption value is larger than the reference current value, and when the host has made the designation. An apparatus for setting the second operation mode as the effective operation mode. The apparatus of claim 2, comprising:
The mode setting unit, when receiving the switching instruction, sets the interface to a state in which the host can issue the information provision request. An apparatus according to claim 2 or claim 3, wherein
When the host cannot supply the maximum current consumption of the second operation mode and the second operation mode cannot be designated as the effective operation mode, the mode setting unit sets the first operation mode to the first operation mode. The device to set as a valid operating mode. An apparatus according to any one of claims 2 to 4,
The first operation mode is a mode for providing a user instruction input function,
The apparatus in which the second operation mode is a mode for providing an image input function. An apparatus according to any one of claims 1 to 5,
The interface is a USB interface;
The apparatus wherein the reference current value is 100 milliamps. A method for controlling a device having a plurality of operation modes corresponding to a predetermined interface that requires notification of a current consumption value from a device to a host,
(A) returning a mode information indicating a maximum current consumption value in the operation mode in response to an information provision request from the host;
(B) a step of setting one of the plurality of operation modes as an effective operation mode in accordance with a designation based on the mode information by the host, wherein a maximum current consumption value is set at the start of connection with the host; Setting the first operation mode that is equal to or lower than a predetermined reference current value that can be supplied by any of the hosts as the effective operation mode. A program for controlling a device having a plurality of operation modes corresponding to a predetermined interface that requires notification of a current consumption value from a device to a host,
A function of returning mode information indicating a maximum current consumption value in the operation mode in response to an information provision request from the host;
A function of setting one of the plurality of operation modes as an effective operation mode in accordance with the specification based on the mode information by the host, wherein the maximum current consumption value is arbitrary when the connection with the host is started. A program that causes a computer to realize a function of setting the first operation mode that is not more than a predetermined reference current value that can be supplied by a host as the effective operation mode.

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