blob: efb2ca75dba06a8e5b1beb71cc20e4edb27cdd3e [file] [log] [blame]
* scsi_module.c Copyright (1994, 1995) Eric Youngdale.
* Support for loading low-level scsi drivers using the linux kernel loadable
* module interface.
* To use, the host adapter should first define and initialize the variable
* driver_template (datatype Scsi_Host_Template), and then include this file.
* This should also be wrapped in a #ifdef MODULE/#endif.
* The low -level driver must also define a release function which will
* free any irq assignments, release any dma channels, release any I/O
* address space that might be reserved, and otherwise clean up after itself.
* The idea is that the same driver should be able to be reloaded without
* any difficulty. This makes debugging new drivers easier, as you should
* be able to load the driver, test it, unload, modify and reload.
* One *very* important caveat. If the driver may need to do DMA on the
* ISA bus, you must have unchecked_isa_dma set in the device template,
* even if this might be changed during the detect routine. This is
* because the shpnt structure will be allocated in a special way so that
* it will be below the appropriate DMA limit - thus if your driver uses
* the hostdata field of shpnt, and the board must be able to access this
* via DMA, the shpnt structure must be in a DMA accessible region of
* memory. This comment would be relevant for something like the buslogic
* driver where there are many boards, only some of which do DMA onto the
* ISA bus. There is no convenient way of specifying whether the host
* needs to be in a ISA DMA accessible region of memory when you call
* scsi_register.
#include <linux/module.h>
#include <linux/init.h>
static int __init init_this_scsi_driver(void)
driver_template.module = THIS_MODULE;
if (driver_template.present)
return 0;
return -ENODEV;
static void __exit exit_this_scsi_driver(void)
* Overrides for Emacs so that we almost follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
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* Local variables:
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