drivers/scsi/hosts.h

   1 /*
   2  *  hosts.h Copyright (C) 1992 Drew Eckhardt
   3  *          Copyright (C) 1993, 1994, 1995, 1998, 1999 Eric Youngdale
   4  *
   5  *  mid to low-level SCSI driver interface header
   6  *      Initial versions: Drew Eckhardt
   7  *      Subsequent revisions: Eric Youngdale
   8  *
   9  *  <drew@colorado.edu>
  10  *
  11  *       Modified by Eric Youngdale eric@andante.org to
  12  *       add scatter-gather, multiple outstanding request, and other
  13  *       enhancements.
  14  *
  15  *  Further modified by Eric Youngdale to support multiple host adapters
  16  *  of the same type.
  17  *
  18  *  Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli
  19  *
  20  *  Restructured scsi_host lists and associated functions.
  21  *  September 04, 2002 Mike Anderson (andmike@us.ibm.com)
  22  */
  23
  24 #ifndef _HOSTS_H
  25 #define _HOSTS_H
  26
  27 #include <linux/config.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/types.h>
  30
  31 #include <scsi/scsi_host.h>
  32
  33 struct scsi_driver {
  34         struct module           *owner;
  35         struct device_driver    gendrv;
  36
  37         int (*init_command)(struct scsi_cmnd *);
  38         void (*rescan)(struct device *);
  39 };
  40 #define to_scsi_driver(drv) \
  41         container_of((drv), struct scsi_driver, gendrv)
  42
  43 extern int scsi_register_driver(struct device_driver *);
  44 #define scsi_unregister_driver(drv) \
  45         driver_unregister(drv);
  46
  47 extern int scsi_register_interface(struct class_interface *);
  48 #define scsi_unregister_interface(intf) \
  49         class_interface_unregister(intf)
  50
  51
  52 /**
  53  * scsi_find_device - find a device given the host
  54  * @shost:      SCSI host pointer
  55  * @channel:    SCSI channel (zero if only one channel)
  56  * @pun:        SCSI target number (physical unit number)
  57  * @lun:        SCSI Logical Unit Number
  58  **/
  59 static inline struct scsi_device *scsi_find_device(struct Scsi_Host *shost,
  60                                             int channel, int pun, int lun) {
  61         struct scsi_device *sdev;
  62
  63         list_for_each_entry (sdev, &shost->my_devices, siblings)
  64                 if (sdev->channel == channel && sdev->id == pun
  65                    && sdev->lun ==lun)
  66                         return sdev;
  67         return NULL;
  68 }
  69
  70 #endif