drivers/fmc/fmc-match.c

   1 /*
   2  * Copyright (C) 2012 CERN (www.cern.ch)
   3  * Author: Alessandro Rubini <rubini@gnudd.com>
   4  *
   5  * Released according to the GNU GPL, version 2 or any later version.
   6  *
   7  * This work is part of the White Rabbit project, a research effort led
   8  * by CERN, the European Institute for Nuclear Research.
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/slab.h>
  12 #include <linux/fmc.h>
  13 #include <linux/ipmi-fru.h>
  14
  15 /* The fru parser is both user and kernel capable: it needs alloc */
  16 void *fru_alloc(size_t size)
  17 {
  18         return kzalloc(size, GFP_KERNEL);
  19 }
  20
  21 /* The actual match function */
  22 int fmc_match(struct device *dev, struct device_driver *drv)
  23 {
  24         struct fmc_driver *fdrv = to_fmc_driver(drv);
  25         struct fmc_device *fdev = to_fmc_device(dev);
  26         struct fmc_fru_id *fid;
  27         int i, matched = 0;
  28
  29         /* This currently only matches the EEPROM (FRU id) */
  30         fid = fdrv->id_table.fru_id;
  31         if (!fid) {
  32                 dev_warn(&fdev->dev, "Driver has no ID: matches all\n");
  33                 matched = 1;
  34         } else {
  35                 if (!fdev->id.manufacturer || !fdev->id.product_name)
  36                         return 0; /* the device has no FRU information */
  37                 for (i = 0; i < fdrv->id_table.fru_id_nr; i++, fid++) {
  38                         if (fid->manufacturer &&
  39                             strcmp(fid->manufacturer, fdev->id.manufacturer))
  40                                 continue;
  41                         if (fid->product_name &&
  42                             strcmp(fid->product_name, fdev->id.product_name))
  43                                 continue;
  44                         matched = 1;
  45                         break;
  46                 }
  47         }
  48
  49         /* FIXME: match SDB contents */
  50         return matched;
  51 }
  52
  53 /* This function creates ID info for a newly registered device */
  54 int fmc_fill_id_info(struct fmc_device *fmc)
  55 {
  56         struct fru_common_header *h;
  57         struct fru_board_info_area *bia;
  58         int ret, allocated = 0;
  59
  60         /* If we know the eeprom length, try to read it off the device */
  61         if (fmc->eeprom_len && !fmc->eeprom) {
  62                 fmc->eeprom = kzalloc(fmc->eeprom_len, GFP_KERNEL);
  63                 if (!fmc->eeprom)
  64                         return -ENOMEM;
  65                 allocated = 1;
  66                 ret = fmc_read_ee(fmc, 0, fmc->eeprom, fmc->eeprom_len);
  67                 if (ret < 0)
  68                         goto out;
  69         }
  70
  71         /* If no eeprom, continue with other matches */
  72         if (!fmc->eeprom)
  73                 return 0;
  74
  75         dev_info(fmc->hwdev, "mezzanine %i\n", fmc->slot_id); /* header */
  76
  77         /* So we have the eeprom: parse the FRU part (if any) */
  78         h = (void *)fmc->eeprom;
  79         if (h->format != 1) {
  80                 pr_info("      EEPROM has no FRU information\n");
  81                 goto out;
  82         }
  83         if (!fru_header_cksum_ok(h)) {
  84                 pr_info("      FRU: wrong header checksum\n");
  85                 goto out;
  86         }
  87         bia = fru_get_board_area(h);
  88         if (!fru_bia_cksum_ok(bia)) {
  89                 pr_info("      FRU: wrong board area checksum\n");
  90                 goto out;
  91         }
  92         fmc->id.manufacturer = fru_get_board_manufacturer(h);
  93         fmc->id.product_name = fru_get_product_name(h);
  94         pr_info("      Manufacturer: %s\n", fmc->id.manufacturer);
  95         pr_info("      Product name: %s\n", fmc->id.product_name);
  96
  97         /* Create the short name (FIXME: look in sdb as well) */
  98         fmc->mezzanine_name = kstrdup(fmc->id.product_name, GFP_KERNEL);
  99
 100 out:
 101         if (allocated) {
 102                 kfree(fmc->eeprom);
 103                 fmc->eeprom = NULL;
 104         }
 105         return 0; /* no error: let other identification work */
 106 }
 107
 108 /* Some ID data is allocated using fru_alloc() above, so release it */
 109 void fmc_free_id_info(struct fmc_device *fmc)
 110 {
 111         kfree(fmc->mezzanine_name);
 112         kfree(fmc->id.manufacturer);
 113         kfree(fmc->id.product_name);
 114 }