--- name: "mse" section: "4" platform: "linux" package: "freebsd-manpages" version: "6.0-5" release: "Debian 4.0 (Etch)" platforms: ["linux"] url: "https://new.carta.tech/mse" --- # mse(4) bus and InPort mice driver ## NAME **mse** – bus and InPort mice driver ## SYNOPSIS **device mse** In */boot/device.hints*: **hint.mse.0.at="isa"** **hint.mse.0.port="0x23c"** **hint.mse.0.irq="5"** ## DESCRIPTION The **mse** driver provides support for the bus mouse and the InPort mouse, which are often collectively called \`\`bus'' mice, as these mice are sold with an interface card which needs to be installed in an expansion bus slot. The interface circuit may come on an integrated I/O card or as an option on video cards. The bus and InPort mice have two or three buttons, and a D-sub 9-pin male connector or a round DIN 9-pin male connector. The primary port address of the bus and InPort mouse interface cards is usually 0x23c. Some cards may also be set to use the secondary port address at 0x238. The interface cards require a single IRQ, which may be 2, 3, 4 or 5. Some cards may offer additional IRQs. The port number and the IRQ number are configured by jumpers on the cards or by software provided with the card. Frequency, or report rate, at which the device sends movement and button state reports to the host system, may also be configurable on some interface cards. It may be 15, 30, 60 or 120Hz. The difference between the two types of the mice is not in mouse devices (in fact they are exactly the same). But in the circuit on the interface cards. This means that the device from a bus mouse package can be connected to the interface card from an InPort mouse package, or vice versa, provided that their connectors match. ### Operation Levels The **mse** driver has two levels of operation. The current operation level can be set via an ioctl call. At the level zero the basic support is provided; the device driver will report horizontal and vertical movement of the attached device and state of up to three buttons in the format described below. It is a subset of the MouseSystems protocol. - Byte 1 - bit 7 Always one. - bit 6..3 Always zero. - bit 2 Left button status; cleared if pressed, otherwise set. - bit 1 Middle button status; cleared if pressed, otherwise set. Always one, if the device does not have the middle button. - bit 0 Right button status; cleared if pressed, otherwise set. - Byte 2 Horizontal movement count in two's compliment; -128 through 127. - Byte 3 Vertical movement count in two's compliment; -128 through 127. - Byte 4 Always zero. - Byte 5 Always zero. This is the default level of operation and the driver is initially at this level when opened by the user program. At the operation level one (extended level), a data packet is encoded in the standard format MOUSE\_PROTO\_SYSMOUSE as defined in [mouse(4)](/mouse/4.md). ### Acceleration The **mse** driver can somewhat \`accelerate' the movement of the pointing device. The faster you move the device, the further the pointer travels on the screen. The driver has an internal variable which governs the effect of the acceleration. Its value can be modified via the driver flag or via an ioctl call. ### Device Number The minor device number of the **mse** is made up of: ``` minor = (`unit' << 1) | `non-blocking' ``` where \`unit' is the device number (usually 0) and the \`non-blocking' bit is set to indicate \`\`do not block waiting for mouse input, return immediately''. The \`non-blocking' bit should be set for *XFree86*, therefore the minor device number usually used for *XFree86* is 1. See FILES for device node names. ## DRIVER CONFIGURATION ### Driver Flags The **mse** driver accepts the following driver flag. Set it in the kernel configuration file (see [config(8)](/config/8.md)) or in the User Configuration Menu at the boot time (see [boot(8)](/boot/8.md)). - bit 4..7 ACCELERATION This flag controls the amount of acceleration effect. The smaller the value of this flag is, more sensitive the movement becomes. The minimum value allowed, thus the value for the most sensitive setting, is one. Setting this flag to zero will completely disables the acceleration effect. ## IOCTLS There are a few [ioctl(2)](/ioctl/2.md) commands for mouse drivers. These commands and related structures and constants are defined in ⟨sys/mouse.h⟩. General description of the commands is given in [mouse(4)](/mouse/4.md). This section explains the features specific to the **mse** driver. - MOUSE\_GETLEVEL *int* *\*level* - MOUSE\_SETLEVEL *int* *\*level* These commands manipulate the operation level of the **mse** driver. - MOUSE\_GETHWINFO *mousehw\_t* *\*hw* Returns the hardware information of the attached device in the following structure. Only the iftype field is guaranteed to be filled with the correct value by the current version of the **mse** driver. ``` typedef struct mousehw { int buttons; /* number of buttons */ int iftype; /* I/F type */ int type; /* mouse/track ball/pad... */ int model; /* I/F dependent model ID */ int hwid; /* I/F dependent hardware ID */ } mousehw_t; ``` The buttons field holds the number of buttons on the device. The iftype is either MOUSE\_IF\_BUS or MOUSE\_IF\_INPORT. The type may be MOUSE\_MOUSE, MOUSE\_TRACKBALL, MOUSE\_STICK, MOUSE\_PAD, or MOUSE\_UNKNOWN. The model is always MOUSE\_MODEL\_GENERIC at the operation level 0. It may be MOUSE\_MODEL\_GENERIC or one of MOUSE\_MODEL\_XXX constants at higher operation levels. The hwid is always 0. - MOUSE\_GETMODE *mousemode\_t* *\*mode* The command gets the current operation parameters of the mouse driver. ``` typedef struct mousemode { int protocol; /* MOUSE_PROTO_XXX */ int rate; /* report rate (per sec), -1 if unknown */ int resolution; /* MOUSE_RES_XXX, -1 if unknown */ int accelfactor; /* acceleration factor */ int level; /* driver operation level */ int packetsize; /* the length of the data packet */ unsigned char syncmask[2]; /* sync. bits */ } mousemode_t; ``` The protocol is either MOUSE\_PROTO\_BUS or MOUSE\_PROTO\_INPORT at the operation level zero. MOUSE\_PROTO\_SYSMOUSE at the operation level one. The rate is the status report rate (reports/sec) at which the device will send movement report to the host computer. As there is no standard to detect the current setting, this field is always set to -1. The resolution is always set to -1. The accelfactor field holds a value to control acceleration feature (see Acceleration). It is zero or greater. If it is zero, acceleration is disabled. The packetsize field specifies the length of the data packet. It depends on the operation level. - *level* *0* 5 bytes - *level* *1* 8 bytes The array syncmask holds a bit mask and pattern to detect the first byte of the data packet. syncmask\[0\] is the bit mask to be ANDed with a byte. If the result is equal to syncmask\[1\], the byte is likely to be the first byte of the data packet. Note that this detection method is not 100% reliable, thus, should be taken only as an advisory measure. Only level and accelfactor are modifiable by the MOUSE\_SETMODE command. Changing the other field does not cause error, but has no effect. - MOUSE\_SETMODE *mousemode\_t* *\*mode* The command changes the current operation parameters of the mouse driver as specified in *mode*. Only level and accelfactor may be modifiable. Setting values in the other field does not generate error and has no effect. - MOUSE\_READDATA *mousedata\_t* *\*data* - MOUSE\_READSTATE *mousedata\_t* *\*state* These commands are not supported by the **mse** driver. - MOUSE\_GETSTATUS *mousestatus\_t* *\*status* The command returns the current state of buttons and movement counts as described in [mouse(4)](/mouse/4.md). ## FILES - */dev/mse0* \`non-blocking' device node in the system without *devfs*, \`blocking' under *devfs*. - */dev/nmse0* \`non-blocking' device node under *devfs*. ## EXAMPLES ``` device mse ``` In */boot/device.hints*: ``` hint.mse.0.at="isa" ``` ``` hint.mse.0.port="0x23c" ``` ``` hint.mse.0.irq="5" ``` Add the **mse** driver at the primary port address with the IRQ 5. ``` device mse ``` ``` hint.mse.1.at="isa" ``` ``` hint.mse.1.port="0x238" ``` ``` hint.mse.1.irq="4" ``` ``` hint.mse.1.flags="0x30" ``` Define the **mse** driver at the secondary port address with the IRQ 4 and the acceleration factor of 3. ## CAVEATS Some bus mouse interface cards generate interrupts at the fixed report rate when enabled, whether or not the mouse state is changing. The others generate interrupts only when the state is changing. ## SEE ALSO [ioctl(2)](/ioctl/2.md), [mouse(4)](/mouse/4.md), [psm(4)](/psm/4.md), [sysmouse(4)](/sysmouse/4.md), [moused(8)](/moused/8.md)