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1626 |
jcastillo |
/*
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* scsi_module.c Copyright (1994, 1995) Eric Youngdale.
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*
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* Support for loading low-level scsi drivers using the linux kernel loadable
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* module interface.
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*
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* To use, the host adapter should first define and initialize the variable
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* driver_template (datatype Scsi_Host_Template), and then include this file.
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* This should also be wrapped in a #ifdef MODULE/#endif.
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*
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* The low -level driver must also define a release function which will
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* free any irq assignments, release any dma channels, release any I/O
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* address space that might be reserved, and otherwise clean up after itself.
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* The idea is that the same driver should be able to be reloaded without
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* any difficulty. This makes debugging new drivers easier, as you should
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* be able to load the driver, test it, unload, modify and reload.
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*
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* One *very* important caveat. If the driver may need to do DMA on the
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* ISA bus, you must have unchecked_isa_dma set in the device template,
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* even if this might be changed during the detect routine. This is
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* because the shpnt structure will be allocated in a special way so that
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* it will be below the appropriate DMA limit - thus if your driver uses
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* the hostdata field of shpnt, and the board must be able to access this
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* via DMA, the shpnt structure must be in a DMA accessible region of
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* memory. This comment would be relevant for something like the buslogic
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* driver where there are many boards, only some of which do DMA onto the
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* ISA bus. There is no convenient way of specifying whether the host
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* needs to be in a ISA DMA accessible region of memory when you call
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* scsi_register.
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*/
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#include <linux/module.h>
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int init_module(void) {
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driver_template.usage_count = &mod_use_count_;
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scsi_register_module(MODULE_SCSI_HA, &driver_template);
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if (driver_template.present)
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return 0;
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scsi_unregister_module(MODULE_SCSI_HA, &driver_template);
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return -1;
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}
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void cleanup_module( void) {
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scsi_unregister_module(MODULE_SCSI_HA, &driver_template);
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}
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/*
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* Overrides for Emacs so that we almost follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-indent-level: 4
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* c-brace-imaginary-offset: 0
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* c-brace-offset: -4
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* c-argdecl-indent: 4
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* c-label-offset: -4
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* c-continued-statement-offset: 4
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* c-continued-brace-offset: 0
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* indent-tabs-mode: nil
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* tab-width: 8
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* End:
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*/
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