firmload(9) - NetBSD Manual Pages

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FIRMLOAD(9)            NetBSD Kernel Developer's Manual            FIRMLOAD(9)


NAME

     firmload -- Firmware loader API for device drivers


SYNOPSIS

     #include <dev/firmload.h>

     int
     firmware_open(const char *drvname, const char *imgname,
         firmware_handle_t *fhp);

     int
     firmware_close(firmware_handle_t fh);

     off_t
     firmware_get_size(firmware_handle_t fh);

     int
     firmware_read(firmware_handle_t fh, off_t offset, void *buf,
         size_t size);

     void *
     firmware_malloc(size_t size);

     void
     firmware_free(void *buf, size_t size);


DESCRIPTION

     firmload provides a simple and convenient API for device drivers to load
     firmware images from files residing in the file system that are necessary
     for the devices that they control.  Firmware images reside in sub-direc-
     tories, one for each driver, of a series of colon-separated path prefixes
     specified by the sysctl variable hw.firmware.path.


FUNCTIONS

     The following functions are provided by the firmload API:

     firmware_open(drvname, imgname, fhp)

             Open the firmware image imgname for the driver drvname.  The path
             to the firmware image file is constructed by appending the string
             ``/drvname/imgname'' to each configured path prefix until opening
             the firmware image file succeeds.  Upon success, firmware_open()
             returns 0 and stores a firmware image handle in the location
             pointed to by fhp.  Otherwise, an error code is returned to indi-
             cate the reason for failure.

     firmware_close(fh)

             Close the firmware image file associated with the firmware handle
             fh.  Returns 0 upon success or an error code to indicate the rea-
             son for failure.

     firmware_get_size(fh)

             Returns the size of the image file associated with the firmware
             handle fh.

     firmware_read(fh, offset, buf, size)

             Reads from the image file associated with the firmware handle fh
             beginning at offset offset for length size.  The firmware image
             data is placed into the buffer specified by buf.  Returns 0 upon
             success or an error code to indicate the reason for failure.

     firmware_malloc(size)

             Allocates a region of wired kernel memory of size size.  Note:
             firmware_malloc() may block.

     firmware_free(buf, size)

             Frees a region of memory previously allocated by
             firmware_malloc().


FILES

     Default search path for firmware
     /libdata/firmware
     /usr/libdata/firmware
     /usr/pkg/libdata/firmware
     /usr/pkg/libdata


SEE ALSO

     autoconf(9), malloc(9), vnsubr(9)


HISTORY

     The firmload framework first appeared in NetBSD 4.0.


AUTHORS

     Jason Thorpe <thorpej@NetBSD.org>

NetBSD 9.4_STABLE               March 16, 2018               NetBSD 9.4_STABLE