| Hante Meuleman | a74d036 | 2014-01-13 22:20:22 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2013 Broadcom Corporation |
| 3 | * |
| 4 | * Permission to use, copy, modify, and/or distribute this software for any |
| 5 | * purpose with or without fee is hereby granted, provided that the above |
| 6 | * copyright notice and this permission notice appear in all copies. |
| 7 | * |
| 8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
| 11 | * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION |
| 13 | * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN |
| 14 | * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/firmware.h> |
| 20 | |
| 21 | #include "nvram.h" |
| 22 | |
| 23 | /* brcmf_nvram_strip :Takes a buffer of "<var>=<value>\n" lines read from a file |
| 24 | * and ending in a NUL. Removes carriage returns, empty lines, comment lines, |
| 25 | * and converts newlines to NULs. Shortens buffer as needed and pads with NULs. |
| 26 | * End of buffer is completed with token identifying length of buffer. |
| 27 | */ |
| 28 | void *brcmf_nvram_strip(const struct firmware *nv, u32 *new_length) |
| 29 | { |
| 30 | u8 *nvram; |
| 31 | u32 i; |
| 32 | u32 len; |
| 33 | u32 column; |
| 34 | u8 val; |
| 35 | bool comment; |
| 36 | u32 token; |
| 37 | __le32 token_le; |
| 38 | |
| 39 | /* Alloc for extra 0 byte + roundup by 4 + length field */ |
| 40 | nvram = kmalloc(nv->size + 1 + 3 + sizeof(token_le), GFP_KERNEL); |
| 41 | if (!nvram) |
| 42 | return NULL; |
| 43 | |
| 44 | len = 0; |
| 45 | column = 0; |
| 46 | comment = false; |
| 47 | for (i = 0; i < nv->size; i++) { |
| 48 | val = nv->data[i]; |
| 49 | if (val == 0) |
| 50 | break; |
| 51 | if (val == '\r') |
| 52 | continue; |
| 53 | if (comment && (val != '\n')) |
| 54 | continue; |
| 55 | comment = false; |
| 56 | if (val == '#') { |
| 57 | comment = true; |
| 58 | continue; |
| 59 | } |
| 60 | if (val == '\n') { |
| 61 | if (column == 0) |
| 62 | continue; |
| 63 | nvram[len] = 0; |
| 64 | len++; |
| 65 | column = 0; |
| 66 | continue; |
| 67 | } |
| 68 | nvram[len] = val; |
| 69 | len++; |
| 70 | column++; |
| 71 | } |
| 72 | column = len; |
| 73 | *new_length = roundup(len + 1, 4); |
| 74 | while (column != *new_length) { |
| 75 | nvram[column] = 0; |
| 76 | column++; |
| 77 | } |
| 78 | |
| 79 | token = *new_length / 4; |
| 80 | token = (~token << 16) | (token & 0x0000FFFF); |
| 81 | token_le = cpu_to_le32(token); |
| 82 | |
| 83 | memcpy(&nvram[*new_length], &token_le, sizeof(token_le)); |
| 84 | *new_length += sizeof(token_le); |
| 85 | |
| 86 | return nvram; |
| 87 | } |
| 88 | |
| 89 | void brcmf_nvram_free(void *nvram) |
| 90 | { |
| 91 | kfree(nvram); |
| 92 | } |
| 93 | |
| 94 | |