/* * 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 #include char kernel_version[] = UTS_RELEASE; int init_module(void) { driver_template.usage_count = &mod_use_count_; scsi_register_module(MODULE_SCSI_HA, &driver_template); return (driver_template.present == 0); } void cleanup_module( void) { if (MOD_IN_USE) { printk(KERN_INFO __FILE__ ": module is in use, remove rejected\n"); } scsi_unregister_module(MODULE_SCSI_HA, &driver_template); }