drivers/fmc/fmc-match.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2012 CERN (www.cern.ch)
   4  * Author: Alessandro Rubini <rubini@gnudd.com>
   5  *
   6  * This work is part of the White Rabbit project, a research effort led
   7  * by CERN, the European Institute for Nuclear Research.
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/slab.h>
  11 #include <linux/fmc.h>
  12 #include <linux/ipmi-fru.h>
  13
  14 /* The fru parser is both user and kernel capable: it needs alloc */
  15 void *fru_alloc(size_t size)
  16 {
  17         return kzalloc(size, GFP_KERNEL);
  18 }
  19
  20 /* The actual match function */
  21 int fmc_match(struct device *dev, struct device_driver *drv)
  22 {
  23         struct fmc_driver *fdrv = to_fmc_driver(drv);
  24         struct fmc_device *fdev = to_fmc_device(dev);
  25         struct fmc_fru_id *fid;
  26         int i, matched = 0;
  27
  28         /* This currently only matches the EEPROM (FRU id) */
  29         fid = fdrv->id_table.fru_id;
  30         if (!fid) {
  31                 dev_warn(&fdev->dev, "Driver has no ID: matches all\n");
  32                 matched = 1;
  33         } else {
  34                 if (!fdev->id.manufacturer || !fdev->id.product_name)
  35                         return 0; /* the device has no FRU information */
  36                 for (i = 0; i < fdrv->id_table.fru_id_nr; i++, fid++) {
  37                         if (fid->manufacturer &&
  38                             strcmp(fid->manufacturer, fdev->id.manufacturer))
  39                                 continue;
  40                         if (fid->product_name &&
  41                             strcmp(fid->product_name, fdev->id.product_name))
  42                                 continue;
  43                         matched = 1;
  44                         break;
  45                 }
  46         }
  47
  48         /* FIXME: match SDB contents */
  49         return matched;
  50 }
  51
  52 /* This function creates ID info for a newly registered device */
  53 int fmc_fill_id_info(struct fmc_device *fmc)
  54 {
  55         struct fru_common_header *h;
  56         struct fru_board_info_area *bia;
  57         int ret, allocated = 0;
  58
  59         /* If we know the eeprom length, try to read it off the device */
  60         if (fmc->eeprom_len && !fmc->eeprom) {
  61                 fmc->eeprom = kzalloc(fmc->eeprom_len, GFP_KERNEL);
  62                 if (!fmc->eeprom)
  63                         return -ENOMEM;
  64                 allocated = 1;
  65                 ret = fmc_read_ee(fmc, 0, fmc->eeprom, fmc->eeprom_len);
  66                 if (ret < 0)
  67                         goto out;
  68         }
  69
  70         /* If no eeprom, continue with other matches */
  71         if (!fmc->eeprom)
  72                 return 0;
  73
  74         dev_info(fmc->hwdev, "mezzanine %i\n", fmc->slot_id); /* header */
  75
  76         /* So we have the eeprom: parse the FRU part (if any) */
  77         h = (void *)fmc->eeprom;
  78         if (h->format != 1) {
  79                 pr_info("      EEPROM has no FRU information\n");
  80                 goto out;
  81         }
  82         if (!fru_header_cksum_ok(h)) {
  83                 pr_info("      FRU: wrong header checksum\n");
  84                 goto out;
  85         }
  86         bia = fru_get_board_area(h);
  87         if (!fru_bia_cksum_ok(bia)) {
  88                 pr_info("      FRU: wrong board area checksum\n");
  89                 goto out;
  90         }
  91         fmc->id.manufacturer = fru_get_board_manufacturer(h);
  92         fmc->id.product_name = fru_get_product_name(h);
  93         pr_info("      Manufacturer: %s\n", fmc->id.manufacturer);
  94         pr_info("      Product name: %s\n", fmc->id.product_name);
  95
  96         /* Create the short name (FIXME: look in sdb as well) */
  97         fmc->mezzanine_name = kstrdup(fmc->id.product_name, GFP_KERNEL);
  98
  99 out:
 100         if (allocated) {
 101                 kfree(fmc->eeprom);
 102                 fmc->eeprom = NULL;
 103         }
 104         return 0; /* no error: let other identification work */
 105 }
 106
 107 /* Some ID data is allocated using fru_alloc() above, so release it */
 108 void fmc_free_id_info(struct fmc_device *fmc)
 109 {
 110         kfree(fmc->mezzanine_name);
 111         kfree(fmc->id.manufacturer);
 112         kfree(fmc->id.product_name);
 113 }