tsalarm - Alarm device driver




     The tsalarm driver is a Multi-threaded, loadable non-STREAMS
     pseudo  driver  that manages ALOM alarms. The tsalarm driver
     provides an interface through which alarm relays can be con-
     trolled on SUNW,Netra-240 and SUNW,Netra-440 platforms.


     The alarm hardware differs depending on platform. The  Netra
     240 and 440 platforms features four dry contact alarm relays
     which are controlled by ALOM. You can set each alarm to "on"
     or  "off" by  using ioctl interfaces provided from the host.
     The four alarms are labeled as "critical," "major," "minor,"
     and  "user."  The  user  alarm  is set by a user application
     depending on system condition. LED's in  front  of  the  box
     provide  a  visual indication of the four alarms. The number
     of alarms and their meanings/labels may  vary  across  plat-


     The interface  provided  by  the  tsalarm  driver  comprises
     ioctls  that  enable  applications  to  manipulate the alarm
     module. The alarm  module is accessed via two device  nodes:
     i) /dev/lom and /dev/tsalarm:ctl.

     The following ioctls are  supported  by   the  /dev/lom  and
     /dev/tsalarm:ctl devices:

          TSIOCALCTL - Turn an alarm on or off.
                The   argument    is    a    pointer    to    the
                ts_aldata_t/lom_aldata_t  structure.  This struc-
                ture is described below. alarm_no  member  is  an
                integer  which  specifies  the alarm to which the
                command is to be applied.  The  alarm_state/state
                structure member indicates the state to which the
                alarm should be set (where 0 ==  off).  An  error
                (EINVAL)   is   returned  if  either  an  invalid
                alarm_no or invalid alarm_state is provided.

          TSIOCALSTATE - Get the state of the alarms.
                The   argument    is    a    pointer    to    the
                ts_aldata_t/lom_aldata_t  structure.  This struc-
                ture is described below. alarm_no  member  is  an
                integer  which  indicates  the alarm to which the
                command will be applied. The  alarm_state  member
                holds  the alarm's current state and is filled in
                by the driver. A zero indicates that the alarm is
                off.  An error (EINVAL) is returned if an invalid
                alarm_no is provided. The structures and  defini-
                tions for the  values  are defined below.

     Alarm values:

     The following old style values are defined in <lom.io.h>

          #define ALARM_NUM_0         0 /* number of zero'th alarm */

          #define ALARM_NUM_1         1 /* number of first alarm */

          #define ALARM_NUM_2         2 /* number of second alarm */

          #define ALARM_NUM_3         3 /* number of third alarm */

       Alarm values defined in <lom.io.h>

          #define ALARM_OFF          0 /* Turn off alarm */

          #define ALARM_ON           1 /* Turn on alarm */

     Alarm Data Structure:

     This structure is defined in <lom.io.h>

          typedef struct {

               int alarm_no;       /* alarm to apply command to */

               int alarm_state;    /* state of alarm (0 == off) */

          } ts_aldata_t;

     Use the following LOM interfaces to get and set the  alarms.
     These definitions are included in <lom_io.h>

         #define ALARM_CRITICAL         0 /* number of critical alarm */

         #define ALARM_MAJOR            1 /* number of major alarm */

         #define ALARM_MINOR            2 /* number of minor alarm */

         #define ALARM_USER             3 /* number of user alarm */

     The  following  alarm  data   structure   is   provided   in

     typedef struct {

             int alarm_no;

             int state;

         } lom_aldata_t;


     An open() will fail if:

     ENXIO The driver is not installed in the system.

     An ioctl() will fail if:

           There was a  hardware  failure  during  the  specified

           The alarm number specified is not valid or an  invalid
           value was supplied.

     ENXIO The driver is not installed in the system or the moni-
           tor callback routine could not be scheduled.


     How to set an alarm:

          #include <sys/unistd.h>
          #include <fcntl.h>
          #include <stdio.h>
          #include <lom_io.h>

          #define LOM_DEVICE "/dev/lom"

             lom_aldata_t lld;
             int fd = open(LOM_DEVICE, O_RDWR);

             if (fd == -1) {
                     printf("Error opening device: %s0, LOM_DEVICE);
                     exit (1);

             lld.alarm_no = ALARM_CRITICAL;   /* Set the critical alarm */
             lld.state = ALARM_ON;   /* Set the alarm */

             if (ioctl(fd, LOMIOCALCTL, (char *)&lld) != 0)
                     printf("Setting alarm failed");
                     printf("Alarm set successfully");




           LOM device.

           Alarm control device.

           Device driver module.

           Driver configuration file.


     See attributes(5) for descriptions of the  following  attri-

    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    | Availability                | SUNWcarx.u                  |
    | Architecture                | SPARC                       |



     Writing Device Drivers

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