[go: nahoru, domu]
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 */
16void *fru_alloc(size_t size)
17{
18	return kzalloc(size, GFP_KERNEL);
19}
20
21/* The actual match function */
22int 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 */
54int 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->op->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
100out:
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 */
109void 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}
115