projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| e7e333cb JG |
1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public | |
| 3 | * License. See the file "COPYING" in the main directory of this archive | |
| 4 | * for more details. | |
| 5 | * | |
| 6 | * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr> | |
| 7 | * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org> | |
| 8 | * Copyright (C) 2012 Jonas Gorski <jonas.gorski@gmail.com> | |
| 9 | */ | |
| 10 | ||
| 11 | #define pr_fmt(fmt) "bcm63xx_nvram: " fmt | |
| 12 | ||
| 13 | #include <linux/init.h> | |
| 14 | #include <linux/export.h> | |
| 15 | #include <linux/kernel.h> | |
| 16 | #include <linux/if_ether.h> | |
| 17 | ||
| 18 | #include <bcm63xx_nvram.h> | |
| 19 | ||
| 20 | /* | |
| 21 | * nvram structure | |
| 22 | */ | |
| 23 | struct bcm963xx_nvram { | |
| 24 | u32 version; | |
| 25 | u8 reserved1[256]; | |
| 26 | u8 name[16]; | |
| 27 | u32 main_tp_number; | |
| 28 | u32 psi_size; | |
| 29 | u32 mac_addr_count; | |
| 30 | u8 mac_addr_base[ETH_ALEN]; | |
| 31 | u8 reserved2[2]; | |
| 32 | u32 checksum_old; | |
| 33 | u8 reserved3[720]; | |
| 34 | u32 checksum_high; | |
| 35 | }; | |
| 36 | ||
| 37 | static struct bcm963xx_nvram nvram; | |
| 38 | static int mac_addr_used; | |
| 39 | ||
| 40 | int __init bcm63xx_nvram_init(void *addr) | |
| 41 | { | |
| 42 | unsigned int check_len; | |
| 43 | u8 *p; | |
| 44 | u32 val; | |
| 45 | ||
| 46 | /* extract nvram data */ | |
| 47 | memcpy(&nvram, addr, sizeof(nvram)); | |
| 48 | ||
| 49 | /* check checksum before using data */ | |
| 50 | if (nvram.version <= 4) | |
| 51 | check_len = offsetof(struct bcm963xx_nvram, checksum_old); | |
| 52 | else | |
| 53 | check_len = sizeof(nvram); | |
| 54 | val = 0; | |
| 55 | p = (u8 *)&nvram; | |
| 56 | ||
| 57 | while (check_len--) | |
| 58 | val += *p; | |
| 59 | if (val) | |
| 60 | return -EINVAL; | |
| 61 | ||
| 62 | return 0; | |
| 63 | } | |
| 64 | ||
| 65 | u8 *bcm63xx_nvram_get_name(void) | |
| 66 | { | |
| 67 | return nvram.name; | |
| 68 | } | |
| 69 | EXPORT_SYMBOL(bcm63xx_nvram_get_name); | |
| 70 | ||
| 71 | int bcm63xx_nvram_get_mac_address(u8 *mac) | |
| 72 | { | |
| 73 | u8 *oui; | |
| 74 | int count; | |
| 75 | ||
| 76 | if (mac_addr_used >= nvram.mac_addr_count) { | |
| 77 | pr_err("not enough mac addresses\n"); | |
| 78 | return -ENODEV; | |
| 79 | } | |
| 80 | ||
| 81 | memcpy(mac, nvram.mac_addr_base, ETH_ALEN); | |
| 82 | oui = mac + ETH_ALEN/2 - 1; | |
| 83 | count = mac_addr_used; | |
| 84 | ||
| 85 | while (count--) { | |
| 86 | u8 *p = mac + ETH_ALEN - 1; | |
| 87 | ||
| 88 | do { | |
| 89 | (*p)++; | |
| 90 | if (*p != 0) | |
| 91 | break; | |
| 92 | p--; | |
| 93 | } while (p != oui); | |
| 94 | ||
| 95 | if (p == oui) { | |
| 96 | pr_err("unable to fetch mac address\n"); | |
| 97 | return -ENODEV; | |
| 98 | } | |
| 99 | } | |
| 100 | ||
| 101 | mac_addr_used++; | |
| 102 | return 0; | |
| 103 | } | |
| 104 | EXPORT_SYMBOL(bcm63xx_nvram_get_mac_address); |