dev_ops Structure

static struct dev_ops xx_dev_ops = {
        DEVO_REV,       /* devo_rev, */
        0,              /* devo_refcnt  */
        xxgetinfo,      /* getinfo(9E) */
        nulldev,        /* identify(9E) */
        xxprobe,        /* probe(9E) */
        xxattach,       /* attach(9E) */
        xxdetach,       /* detach(9E) */
        nodev,          /* devo_reset */
        &xx_cb_ops,     /* devo_cb_ops */
        NULL,           /* devo_bus_ops */
        &xxpower        /* power(9E) */
};

The dev_ops(9S) structure allows the kernel to find the autoconfiguration entry points of the device driver. The devo_rev field identifies the revision number of the structure itself, and must be set to DEVO_REV. The devo_refcnt field must be initialized to zero. The function address fields should be filled in with the address of the appropriate driver entry point. Exceptions are:

• If a probe(9E) routine is not needed, set the dev_ptr field to nulldev(9F).

• identify(9E) is obsolete and no longer required. Set this field to nulldev(9F).

• Set devo_reset to nodev(9F).

• Drivers for devices that provide Power Management functionality must have a power(9E) entry point. If a power(9E) routine is not needed, set this field to NULL.

The devo_cb_ops member should include the address of the cb_ops(9S) structure. The devo_bus_ops field must be set to NULL.