Copyright (c) 2006 The NetBSD Foundation, Inc.
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.Dd January 17, 2006 .Dt FIRMLOAD 9 .Os .Sh NAME .Nm firmload .Nd Firmware loader API for device drivers .Sh SYNOPSIS n dev/firmload.h
.Ft int .Fn "firmware_open" "const char *drvname" "const char *imgname" \ "firmware_handle_t *fhp"
.Ft int .Fn "firmware_close" "firmware_handle_t fh"
.Ft off_t .Fn "firmware_get_size" "firmware_handle_t fh"
.Ft int .Fn "firmware_read" "firmware_handle_t fh" "off_t offset" "void *buf" \ "size_t size"
.Ft void * .Fn "firmware_malloc" "size_t size"
.Ft void .Fn "firmware_free" "void *buf" "size_t size" .Sh DESCRIPTION .Nm 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-directories, one for each driver, of a series of colon-separated path prefixes specified the sysctl variable .Dv hw.firmware.path .
p The following functions are provided by the .Nm API: l -tag -width indent t int Fn "firmware_open" "const char *drvname" "const char *imgname" \ "firmware_handle_t *fhp"
p Open then firmware image .Fa imgname for the driver .Fa drvname . The path to the firmware image file is constructed by appending the string .Dq "/drvname/imgname" to each configured path prefix until opening the firmware image file succeeds. Upon success, .Fn firmware_open returns 0 and stores a firmware image handle in the location pointed to by .Fa fhp . Otherwise, an error code is returned to indicate the reason for failure. t int Fn "firmware_close" "firmware_handle_t fh"
p Close the firmware image file associated with the firmware handle .Fa fh . Returns 0 upon success or an error code to indicate the reason for failure. t off_t Fn "firmware_get_size" "firmware_handle_t fh"
p Returns the size of the image file associated with the firmware handle .Fa fh . t int Fn "firmware_read" "firmware_handle_t fh" "off_t offset" "void *buf" \ "size_t size"
p Reads from the image file associated with the firmware handle .Fa fh beginning at offset .Fa offset for length .Fa size . The firmware image data is placed into the buffer specified by .Fa buf . Returns 0 upon success or an error code to indicate the reason for failure. t void * Ns Fn "firmware_malloc" "size_t size"
p Allocates a region of wired kernel memory of size .Fa size . Note: .Fn firmware_malloc may block. t void Fn "firmware_free" "void *buf" "size_t size"
p Frees a region of memory previously allocated by .Fn firmware_malloc . .El .Sh SEE ALSO .Xr autoconf 9 , .Xr malloc 9 , .Xr vnsubr 9 .Sh HISTORY The .Nm framework first appeared in .Nx 4.0 . .Sh AUTHORS .An Jason Thorpe <thorpej@NetBSD.org>