scsi_module.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:3k
- /*
- * 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;
- scsi_register_module(MODULE_SCSI_HA, &driver_template);
- if (driver_template.present)
- return 0;
- scsi_unregister_module(MODULE_SCSI_HA, &driver_template);
- return -ENODEV;
- }
- static void __exit exit_this_scsi_driver(void)
- {
- scsi_unregister_module(MODULE_SCSI_HA, &driver_template);
- }
- module_init(init_this_scsi_driver);
- module_exit(exit_this_scsi_driver);
- /*
- * 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.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-indent-level: 4
- * c-brace-imaginary-offset: 0
- * c-brace-offset: -4
- * c-argdecl-indent: 4
- * c-label-offset: -4
- * c-continued-statement-offset: 4
- * c-continued-brace-offset: 0
- * indent-tabs-mode: nil
- * tab-width: 8
- * End:
- */