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Kernel Functions for Driversddi_devid_compare(9F)


NAME

 ddi_devid_compare, ddi_devid_free, ddi_devid_init, ddi_devid_register, ddi_devid_sizeof, ddi_devid_str_decode, ddi_devid_str_encode, ddi_devid_str_free, ddi_devid_unregister, ddi_devid_valid - kernel interfaces for device ids

SYNOPSIS

 int ddi_devid_compare(ddi_devid_t devid1, ddi_devid_t devid2);
 size_t ddi_devid_sizeof(ddi_devid_t devid);
 int ddi_devid_init(dev_info_t *dip, ushort_t devid_type, ushort_t nbytes, void *id, ddi_devid_t *retdevid);
 void ddi_devid_free(ddi_devid_t devid);
 int ddi_devid_register(dev_info_t *dip, ddi_devid_t devid );
 int ddi_devid_str_decode(char *devidstr, ddi_devid_t *retdevid, char **retminor_name);
 int ddi_devid_str_encode(ddi_devid_t devid, char *minor_name);
 int ddi_devid_str_free(char *devidstr);
 void ddi_devid_unregister(dev_info_t *dip);
 int ddi_devid_valid(ddi_devid_t devid);

PARAMETERS

 
devid
The device id address.
devidstr
The devid and minor_name represented as a string.
devid1
The first of two device id addresses to be compared calling ddi_devid_compare().
devid2
The second of two device id addresses to be compared calling ddi_devid_compare().
dip
A dev_info pointer, which identifies the device.
devid_type
The following device id types may be accepted by the ddi_devid_init() function:
DEVID_SCSI3_WWN
World Wide Name associated with SCSI-3 devices.
DEVID_SCSI_SERIAL
Vendor IDand serial number associated with a SCSI device. Note: This may only be used if known to be unique; otherwise a fabricated device id must be used.
DEVID_ENCAP
Device ID of another device. This is for layered device driver usage.
DEVID_FAB
Fabricated device ID.
minor_name
The minor name to be encoded.
nbytes
The length in bytes of device ID.
retdevid
The return address of the device ID.
retminor_name
The return address of a minor name. Free string with ddi_devid_str_free().

INTERFACE LEVEL

 

Solaris DDI specific (Solaris DDI).

DESCRIPTION

 

The following routines are used to provide unique identifiers, device IDs, for devices. Specifically, kernel modules use these interfaces to identify and locate devices, independent of the device's physical connection or its logical device name or number.

ddi_devid_compare() compares two device IDs byte-by-byte and determines both equality and sort order.

ddi_devid_sizeof() returns the number of bytes allocated for the passed in device ID (devid).

ddi_devid_init() allocates memory and initializes the opaque device ID structure. This function does not store the devid. If the device id is not derived from the device's firmware, it is the driver's responsibility to store the devid on some reliable store. When a devid_type of either DEVID_SCSI3_WWN, DEVID_SCSI_SERIAL, or DEVID_ENCAP is accepted, an array of bytes (id) must be passed in (nbytes).

When the devid_type DEVID_FAB is used, the array of bytes (id) must be NULL and the length (nbytes) must be zero. The fabricated device ids, DEVID_FAB will be initialized with the machine's host id and a timestamp.

Drivers must free the memory allocated by this function, using the ddi_devid_free() function.

ddi_devid_free() frees the memory allocated for the returned devid by the ddi_devid_init() and devid_str_decode() functions.

ddi_devid_register() registers the device ID address (devid) with the DDI framework, associating it with the dev_info passed in (dip). The drivers must register device IDs at attach time. See attach(9E).

ddi_devid_unregister() removes the device ID address from the dev_info passed in (dip). Drivers must use this function to unregister the device ID when devices are being detached. This function does not free the space allocated for the device ID. The driver must free the space allocated for the device ID, using the ddi_devid_free() function. See detach(9E).

ddi_devid_valid() validates the device ID (devid) passed in. The driver must use this function to validate any fabricated device ID that has been stored on a device.

The ddi_devid_str_encode() function encodes a devid and minor_name into a null-terminated ASCII string, returning a pointer to that string. If both a devid and a minor_name are non-null, then a slash (/) is used to separate the devid from the minor_name in the encoded string. If minor_name is null, then only the devid is encoded. If the devid is null, then the special string id0 is returned. Note that you cannot compare the returned string against another string with strcmp() to determine devid equality. The returned string must be freed by calling devid_str_free().

The ddi_devid_str_decode() function takes a string previously produced by the devid_str_encode(3DEVID) or ddi_devid_str_encode() function and decodes the contained device ID and minor_name, allocating and returning pointers to the extracted parts through the retdevid and retminor_name arguments. If the special devidstr id0 was specified then the returned device ID and minor name will both be null. A non-null returned devid must be freed by the caller through the ddi_devid_free() function. A non-null returned minor name must be freed by calling ddi_devid_str_free().

The ddi_devid_str_free() function is used to free all strings returned by the ddi_devid functions (the ddi_devid_str_encode() function return value and the returned retminor_name argument).

RETURN VALUES

 

ddi_devid_init() returns the following values:

DDI_SUCCESS
Success.
DDI_FAILURE
Out of memory. An invalid devid_type was passed in.

ddi_devid_valid() returns the following values:

DDI_SUCCESS
Valid device ID.
DDI_FAILURE
Invalid device ID.

ddi_devid_register() returns the following values:

DDI_SUCCESS
Success.
DDI_FAILURE
Failure. The device ID is already registered or the device ID is invalid.

ddi_devid_valid() returns the following values:

DDI_SUCCESS
Valid device ID.
DDI_FAILURE
Invalid device ID.

ddi_devid_compare() returns the following values:

-1
The first device ID is less than the second device ID.
0
The first device ID is equal to the second device ID.
1
The first device ID is greater than the second device ID.

ddi_devid_sizeof() returns the size of the devid in bytes. If called with a null, then the number of bytes that must be allocated and initialized to determine the size of a complete device ID is returned.

ddi_devid_str_encode() returns a value of null to indicate failure. Failure can be caused by attempting to encode an invalid devid. If the return value is non-null then the caller must free the returned string by using the devid_str_free() function.

ddi_devid_str_decode() returns the following values:

DDI_SUCCESS
Success.
DDI_FAILURE
Failure; the devidstr string was not valid.

CONTEXT

 

These functions can be called from a user or kernel context.

SEE ALSO

 

devid_get(3DEVID), , libdevid(3LIB), attributes(5), attach(9E), detach(9E), kmem_free(9F)

Writing Device Drivers


SunOS 5.9Go To TopLast Changed 9 Nov 2000

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.