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377 lines
10 KiB
Groff
377 lines
10 KiB
Groff
.\"
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.Dd Nov 8, 1996
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.Dt PSM 4
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.Os
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.Sh NAME
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.Nm psm
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.Nd
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PS/2 mouse style pointing device driver
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.Sh SYNOPSIS
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.\".Cd "options PSM_NOCHECKSYNC"
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.\".Cd "options PSM_NOEMULATION"
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.\".Cd "options" \&"PSM_ACCEL=N\&"
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.Cd "options" \&"PSM_RESETDELAY=N\&"
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.Cd "options" \&"PSM_MAXWAIT=N\&"
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.Cd "options" \&"PSM_DEBUG=N\&"
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.Cd "device psm0 at isa? port" \&"IO_KBD\&" conflicts tty irq 12 vector psmintr
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.Sh DESCRIPTION
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The
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.Nm
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driver provides support for the PS/2 mouse style pointing device.
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Note that
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.Nm port \&"IO_KBD\&"
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and
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.Nm conflicts
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is required
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as the PS/2 mouse port is located
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at the auxially port of the keyboard controller, thus, the
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.Nm
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driver has to share the port with the keyboard driver.
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Note also that there is currently no provision of changing the
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.Nm irq
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number.
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.Pp
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A series of data packets is read from the
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.Nm
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driver. A data packet from the PS/2 mouse style pointing device
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is three bytes long:
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.Pp
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.Bl -tag -width Byte_1
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.It Byte 1
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.Bl -tag -width bit_7
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.It bit 7
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One indicates overflow in the vertical movement count.
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.It bit 6
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One indicates overflow in the horizontal movement count.
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.It bit 5
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Set if the vertical movement count is negative.
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.It bit 4
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Set if the horizontal movement count is negative.
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.It bit 3
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Always one?.
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.It bit 2
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Middle button status; set if pressed. For the device without the middle
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button, this bit is always one?.
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.It bit 1
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Right button status; set if pressed.
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.It bit 0
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Left button status; set if pressed.
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.El
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.It Byte 2
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Horizontal movement count in two's compliment;
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-128 through 127.
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.It Byte 3
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Vertical movement count in two's compliment;
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-128 through 127.
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.El
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.Pp
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The minor device number of the
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.Nm
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is made up of:
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.Bd -literal -offset indent
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minor = (`unit' << 1) | `non-blocking'
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.Ed
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.Pp
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where `unit' is the device number (usually 0) and the `non-blocking' bit
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is set to indicate "don't block waiting for mouse input, return immediately".
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The `non-blocking' bit should be set for \fIXFree86\fP,
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therefore the minor device number usually used for \fIXFree86\fP is 1.
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.Sh KERNEL CONFIGURATION
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There are following options to control the
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.Nm
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device.
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.Bl -tag -width MOUSE
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.\".It Em PSM_NOCHECKSYNC
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.\"By default, the driver tries to detect the first byte of
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.\"the three-byte-long data packet. However, this may not always be
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.\"reliable. This feature will be turned off by specifying this option.
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.\".It Em PSM_NOEMULATION
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.\"The
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.\".Nm
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.\"driver can emulate the Microsoft Serial Mouse's three-byte
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.\"data packet and the Mouse Systems Corp's five-byte data packet
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.\"when data is read by user programs, if so specified by the
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.\".Fn ioctl
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.\"command
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.\".Dv MOUSE_SETMODE .
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.\"The emulation will be disabled with this option.
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.\".It Em PSM_ACCEL=N
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.\"The
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.\".Nm
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.\"driver somewhat `accelerates' the movement of the pointing device.
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.\"That is, the faster you move the device, the longer the pointer
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.\"travels on the screen. This option controls the amount of acceleration.
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.\"The smaller
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.\".Fa N
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.\"is, more sensitive the movement becomes. The default value is 2.
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.\"The minimum value, thus the value for the most sensitive setting, allowed
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.\"is 1. Setting this option to zero will completely disables the
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.\"acceleration effect.
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.It Em PSM_RESETDELAY=X, PSM_MAXWAIT=Y
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The
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.Nm
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driver will attempt to reset the pointing device during the boot process.
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It sometimes takes a long while before the device will respond after
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reset. These options control how long the driver should wait before
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it eventually gives up waiting. The driver will wait
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.Fa X
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*
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.Fa Y
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msecs at most. If the driver seems unable to detect your pointing
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device, you may want to increase these values. The default values are
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200 msec for
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.Fa X
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and 5
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for
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.Fa Y .
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.It Em PSM_DEBUG=N
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Sets the debug level to
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.Fa N .
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The default debug level is zero. See
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.Em DIAGNOSTICS
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for debug logging.
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.El
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.\".Sh IOCTL
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.\".Bl -tag -width MOUSE
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.\".It Dv MOUSE_GETSTATE, MOUSECREAD
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.\"The command returns the current mouse state in the following structure
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.\"and remove the state information from the internal queue.
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.\".Bd -literal
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.\"struct mouseinfo {
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.\" unsigned char status; /* button and motion status bits */
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.\" char xmotion; /* horizontal motion count */
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.\" char ymotion; /* vertical motion count */
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.\"};
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.\".Ed
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.\".Pp
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.\"The
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.\".Dv status
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.\"holds a ORed value of the following constants:
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.\".Bl -tag -width BUTSTATMASK
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.\".It Dv BUT1STAT
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.\"The Button 1 (left button) is pressed.
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.\".It Dv BUT2STAT
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.\"The Button 2 (middle button) is pressed.
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.\".It Dv BUT3STAT
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.\"The Button 3 (right button) is pressed.
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.\".It Dv BUT1CHNG
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.\"The state of the button 1 has changed.
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.\".It Dv BUT2CHNG
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.\"The state of the button 2 has changed.
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.\".It Dv BUT3CHNG
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.\"The state of the button 3 has changed.
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.\".It Dv MOVEMENT
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.\"Either
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.\".Dv xmotion
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.\"or
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.\".Dv ymotion
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.\"is not zero.
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.\".El
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.\".Pp
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.\"Note that these commands and
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.\".Fn read
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.\"operation on the
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.\".Nm
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.\"driver uses the same internal queue. Therefore, interleaving
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.\"these commands and
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.\".Fn read
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.\"operation is not recommended.
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.\".It Dv MOUSE_GETINFO
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.\"Returns the hardware information in the following structure:
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.\".Bd -literal
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.\"typedef struct mousehw {
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.\" int buttons; /* number of buttons */
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.\" int iftype; /* I/F type */
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.\" int type; /* mouse/track ball/pad... */
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.\" int hwid; /* I/F dependent hardware ID */
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.\"} mousehw_t;
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.\".Ed
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.\".Pp
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.\"The
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.\".Dv iftype
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.\"is
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.\".Dv MOUSE_IF_PS2
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.\"for the
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.\".Nm
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.\"driver. The
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.\".Dv type
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.\"tells the device type:
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.\".Dv MOUSE_MOUSE ,
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.\".Dv MOUSE_TRACKBALL ,
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.\".Dv MOUSE_STICK ,
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.\".Dv MOUSE_PAD ,
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.\"or
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.\".Dv MOUSE_UNKNOWN .
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.\"The user should not heavily rely on this field, as the
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.\".Nm
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.\"driver may not always, in fact it is very rarely able to, identify
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.\"the device type.
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.\"The
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.\".Dv hwid
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.\"is the ID value returned by the pointing device. See below for possible
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.\"values.
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.\".It Dv MOUSE_GETMODE, MOUSE_SETMODE
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.\"The commands get and set operation mode of the
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.\".Nm
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.\"driver.
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.\".Bd -literal
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.\"typedef struct mousemode {
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.\" int protocol; /* MOUSE_PROTO_XXX */
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.\" int rate; /* report rate (per sec), -1 if unknown */
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.\" int resolution; /* ppi, -1 if unknown */
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.\" int accelfactor; /* acceleration factor (must be 1 or greater) */
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.\"} mousemode_t;
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.\".Ed
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.\".Pp
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.\"The
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.\".Dv protocol
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.\"selects the format with which the device status is returned by
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.\".Fn read .
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.\"The default is
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.\".Dv MOUSE_PROTO_PS2 ,
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.\"that is, the data byte from the pointing device is returned as is.
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.\"Other possible values are:
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.\".Dv MOUSE_PROTO_MSS
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.\"and
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.\".Dv MOUSE_PROTO_MSC ,
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.\"which specifies Microsoft Serial Mouse three-byte format and
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.\"Mouse Systems Corp.'s five-byte format respectively.
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.\"The
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.\".Dv rate
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.\"is the status report rate (reports/sec) at which the device will send
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.\"movement report to the host computer.
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.\"The
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.\".Dv resolution
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.\"of the pointing device is expressed in pulse-per-inch. Setting
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.\"this field to an arbitrary value may not always work.
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.\"The
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.\".Dv accelfactor
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.\"holds a value to control acceleration feature (see description on
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.\".Em PSM_ACCEL
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.\"above). It must be one or greater.
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.\"If acceleration is disabled by the kernel configuration,
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.\"setting this field has no effect.
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.\".El
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.Sh DIAGNOSTICS
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.Pp
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At debug level 0, little information is logged except for the following
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line during boot process:
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.Bd -literal -offset indent
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psm0: device ID X, N buttons?
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.Ed
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.Pp
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where
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.Fa X
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the device ID code returned by the found pointing device.
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Known IDs include:
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.Bl -tag -width 0__
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.It Em 0
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Mouse (Microsoft, Logitech and many other manufacturers)
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.It Em 2
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Microsoft Ballpoint mouse
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.El
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.Pp
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Currently the
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.Nm
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driver can detect the 3 button mouse from Logitech and report
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accordingly.
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The 3 button mouse from the other manufacturer may or may not be
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reported correctly. However, it will not affect the operation of
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the driver.
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.Pp
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At debug level 1 more information will be logged
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while the driver probes the auxially (mouse) port.
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Messages are logged with the LOG_KERN facility at the LOG_DEBUG level.
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(See
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.Xr syslogd 8 . )
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.Bd -literal -offset indent
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psm0: current command byte:xxxx
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psm: TEST_AUX_PORT status:0000
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psm: RESET_AUX return code:00fa
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psm: RESET_AUX status:00aa
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psm: RESET_AUX ID:0000
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psm: status xx yy zz (get_mouse_buttons)
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psm0: status 00 03 64
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.Ed
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.Pp
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The first line shows the command byte value of the keyboard
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controller just before the auxially port is probed.
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It usually is 4D, 45, 47 or 65, depending on the keyboard device
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driver.
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.Pp
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The second line shows the result of the keyboard controller's
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test on the auxially port interface, with zero indicating
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no error; note that some controllers report no error even if
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the port does not exist in the system, however.
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.Pp
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The third to fifth lines show the reset status of the pointing device.
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The functioning device should return the sequence of FA AA <ID>.
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The ID code is described above.
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.Pp
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The seventh line show the current hardware settings; it consists
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of three bytes:
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.Bl -tag -width Byte_1
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.It Byte 1
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.Bl -tag -width bit_6
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.It bit 6
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0: stream mode (default after reset), 1: remote mode.
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In the stream mode, the pointing device sends the device status
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whenever its state changes. In the remote mode, the host computer
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must request the status to be sent.
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.It bit 5
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Set if the pointing device is currently enabled. Otherwise zero.
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.It bit 4
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0 - 1:1 scaling, 1 - 2:1 scaling.
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.It bit 2
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Left button status; set if pressed.
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.It bit 1
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Middle button status; set if pressed.
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.It bit 0
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Right button status; set if pressed.
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.El
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.It Byte 2
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Resolution.
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.Bl -tag -width 100
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.It 0
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25 pulse per inch (ppi)
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.It 1
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50 ppi
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.It 2
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100 ppi
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.It 3
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200 ppi
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.El
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.It Byte 3
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The status report rate (reports/sec) at which the device will send
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movement report to the host computer.
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.El
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.Pp
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Note that the pointing device will not be enabled until the
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.Nm
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device is opened by the user programs.
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.Pp
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At debug level 2, much more detailed information is logged.
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.Sh CAVEATS
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There is not a guaranteed way to re-synchronize with the first byte
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of the packet once we are out of synchronization with the data
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stream, because there is not a unique bit pattern to identify
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the first byte with.
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.Sh BUGS
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The driver includes the code for the
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.Dv MOUSECREAD
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command of
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.Fn ioctl
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function, which fills a
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.Fa mouseinfo
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structure (see
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.Ao Pa machine/mouse.h Ac ).
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However, it currently is not functioning properly, and may be removed
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in the future.
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.Sh SEE ALSO
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.Xr mse 4 ,
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.Xr syslog 3 ,
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.Xr syslogd 8
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.\" .Sh HISTORY
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.\" .Sh AUTHOR
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