1 /*
2 * scsi_module.c Copyright (1994, 1995) Eric Youngdale.
3 *
4 * Support for loading low-level scsi drivers using the linux kernel loadable
5 * module interface.
6 *
7 * To use, the host adapter should first define and initialize the variable
8 * driver_template (datatype Scsi_Host_Template), and then include this file.
9 * This should also be wrapped in a #ifdef MODULE/#endif.
10 *
11 * The low -level driver must also define a release function which will
12 * free any irq assignments, release any dma channels, release any I/O
13 * address space that might be reserved, and otherwise clean up after itself.
14 * The idea is that the same driver should be able to be reloaded without
15 * any difficulty. This makes debugging new drivers easier, as you should
16 * be able to load the driver, test it, unload, modify and reload.
17 *
18 * One *very* important caveat. If the driver may need to do DMA on the
19 * ISA bus, you must have unchecked_isa_dma set in the device template,
20 * even if this might be changed during the detect routine. This is
21 * because the shpnt structure will be allocated in a special way so that
22 * it will be below the appropriate DMA limit - thus if your driver uses
23 * the hostdata field of shpnt, and the board must be able to access this
24 * via DMA, the shpnt structure must be in a DMA accessible region of
25 * memory. This comment would be relevant for something like the buslogic
26 * driver where there are many boards, only some of which do DMA onto the
27 * ISA bus. There is no convenient way of specifying whether the host
28 * needs to be in a ISA DMA accessible region of memory when you call
29 * scsi_register.
30 */
31
32 #include <linux/module.h>
33 #include <linux/init.h>
34
35 static int __init init_this_scsi_driver(void)
36 {
37 driver_template.module = THIS_MODULE;
38 scsi_register_module(MODULE_SCSI_HA, &driver_template);
39 if (driver_template.present)
40 return 0;
41
42 scsi_unregister_module(MODULE_SCSI_HA, &driver_template);
43 return -ENODEV;
44 }
45
46 static void __exit exit_this_scsi_driver(void)
47 {
48 scsi_unregister_module(MODULE_SCSI_HA, &driver_template);
49 }
50
51 module_init(init_this_scsi_driver);
52 module_exit(exit_this_scsi_driver);
53
54 /*
55 * Overrides for Emacs so that we almost follow Linus's tabbing style.
56 * Emacs will notice this stuff at the end of the file and automatically
57 * adjust the settings for this buffer only. This must remain at the end
58 * of the file.
59 * ---------------------------------------------------------------------------
60 * Local variables:
61 * c-indent-level: 4
62 * c-brace-imaginary-offset: 0
63 * c-brace-offset: -4
64 * c-argdecl-indent: 4
65 * c-label-offset: -4
66 * c-continued-statement-offset: 4
67 * c-continued-brace-offset: 0
68 * indent-tabs-mode: nil
69 * tab-width: 8
70 * End:
71 */
72
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