diff options
Diffstat (limited to 'drivers/net/wireless/brcm80211/brcmfmac/nvram.c')
| -rw-r--r-- | drivers/net/wireless/brcm80211/brcmfmac/nvram.c | 220 |
1 files changed, 176 insertions, 44 deletions
diff --git a/drivers/net/wireless/brcm80211/brcmfmac/nvram.c b/drivers/net/wireless/brcm80211/brcmfmac/nvram.c index d5ef86db631b..5c450d11dbc9 100644 --- a/drivers/net/wireless/brcm80211/brcmfmac/nvram.c +++ b/drivers/net/wireless/brcm80211/brcmfmac/nvram.c @@ -18,72 +18,205 @@ #include <linux/slab.h> #include <linux/firmware.h> +#include "dhd_dbg.h" #include "nvram.h" -/* brcmf_nvram_strip :Takes a buffer of "<var>=<value>\n" lines read from a file +enum nvram_parser_state { + IDLE, + KEY, + VALUE, + COMMENT, + END +}; + +/** + * struct nvram_parser - internal info for parser. + * + * @state: current parser state. + * @fwnv: input buffer being parsed. + * @nvram: output buffer with parse result. + * @nvram_len: lenght of parse result. + * @line: current line. + * @column: current column in line. + * @pos: byte offset in input buffer. + * @entry: start position of key,value entry. + */ +struct nvram_parser { + enum nvram_parser_state state; + const struct firmware *fwnv; + u8 *nvram; + u32 nvram_len; + u32 line; + u32 column; + u32 pos; + u32 entry; +}; + +static bool is_nvram_char(char c) +{ + /* comment marker excluded */ + if (c == '#') + return false; + + /* key and value may have any other readable character */ + return (c > 0x20 && c < 0x7f); +} + +static bool is_whitespace(char c) +{ + return (c == ' ' || c == '\r' || c == '\n' || c == '\t'); +} + +static enum nvram_parser_state brcmf_nvram_handle_idle(struct nvram_parser *nvp) +{ + char c; + + c = nvp->fwnv->data[nvp->pos]; + if (c == '\n') + return COMMENT; + if (is_whitespace(c)) + goto proceed; + if (c == '#') + return COMMENT; + if (is_nvram_char(c)) { + nvp->entry = nvp->pos; + return KEY; + } + brcmf_dbg(INFO, "warning: ln=%d:col=%d: ignoring invalid character\n", + nvp->line, nvp->column); +proceed: + nvp->column++; + nvp->pos++; + return IDLE; +} + +static enum nvram_parser_state brcmf_nvram_handle_key(struct nvram_parser *nvp) +{ + enum nvram_parser_state st = nvp->state; + char c; + + c = nvp->fwnv->data[nvp->pos]; + if (c == '=') { + st = VALUE; + } else if (!is_nvram_char(c)) { + brcmf_dbg(INFO, "warning: ln=%d:col=%d: '=' expected, skip invalid key entry\n", + nvp->line, nvp->column); + return COMMENT; + } + + nvp->column++; + nvp->pos++; + return st; +} + +static enum nvram_parser_state +brcmf_nvram_handle_value(struct nvram_parser *nvp) +{ + char c; + char *skv; + char *ekv; + u32 cplen; + + c = nvp->fwnv->data[nvp->pos]; + if (!is_nvram_char(c)) { + /* key,value pair complete */ + ekv = (u8 *)&nvp->fwnv->data[nvp->pos]; + skv = (u8 *)&nvp->fwnv->data[nvp->entry]; + cplen = ekv - skv; + /* copy to output buffer */ + memcpy(&nvp->nvram[nvp->nvram_len], skv, cplen); + nvp->nvram_len += cplen; + nvp->nvram[nvp->nvram_len] = '\0'; + nvp->nvram_len++; + return IDLE; + } + nvp->pos++; + nvp->column++; + return VALUE; +} + +static enum nvram_parser_state +brcmf_nvram_handle_comment(struct nvram_parser *nvp) +{ + char *eol, *sol; + + sol = (char *)&nvp->fwnv->data[nvp->pos]; + eol = strchr(sol, '\n'); + if (eol == NULL) + return END; + + /* eat all moving to next line */ + nvp->line++; + nvp->column = 1; + nvp->pos += (eol - sol) + 1; + return IDLE; +} + +static enum nvram_parser_state brcmf_nvram_handle_end(struct nvram_parser *nvp) +{ + /* final state */ + return END; +} + +static enum nvram_parser_state +(*nv_parser_states[])(struct nvram_parser *nvp) = { + brcmf_nvram_handle_idle, + brcmf_nvram_handle_key, + brcmf_nvram_handle_value, + brcmf_nvram_handle_comment, + brcmf_nvram_handle_end +}; + +static int brcmf_init_nvram_parser(struct nvram_parser *nvp, + const struct firmware *nv) +{ + memset(nvp, 0, sizeof(*nvp)); + nvp->fwnv = nv; + /* Alloc for extra 0 byte + roundup by 4 + length field */ + nvp->nvram = kzalloc(nv->size + 1 + 3 + sizeof(u32), GFP_KERNEL); + if (!nvp->nvram) + return -ENOMEM; + + nvp->line = 1; + nvp->column = 1; + return 0; +} + +/* brcmf_nvram_strip :Takes a buffer of "<var>=<value>\n" lines read from a fil * and ending in a NUL. Removes carriage returns, empty lines, comment lines, * and converts newlines to NULs. Shortens buffer as needed and pads with NULs. * End of buffer is completed with token identifying length of buffer. */ void *brcmf_nvram_strip(const struct firmware *nv, u32 *new_length) { - u8 *nvram; - u32 i; - u32 len; - u32 column; - u8 val; - bool comment; + struct nvram_parser nvp; + u32 pad; u32 token; __le32 token_le; - /* Alloc for extra 0 byte + roundup by 4 + length field */ - nvram = kmalloc(nv->size + 1 + 3 + sizeof(token_le), GFP_KERNEL); - if (!nvram) + if (brcmf_init_nvram_parser(&nvp, nv) < 0) return NULL; - len = 0; - column = 0; - comment = false; - for (i = 0; i < nv->size; i++) { - val = nv->data[i]; - if (val == 0) + while (nvp.pos < nv->size) { + nvp.state = nv_parser_states[nvp.state](&nvp); + if (nvp.state == END) break; - if (val == '\r') - continue; - if (comment && (val != '\n')) - continue; - comment = false; - if (val == '#') { - comment = true; - continue; - } - if (val == '\n') { - if (column == 0) - continue; - nvram[len] = 0; - len++; - column = 0; - continue; - } - nvram[len] = val; - len++; - column++; } - column = len; - *new_length = roundup(len + 1, 4); - while (column != *new_length) { - nvram[column] = 0; - column++; + pad = nvp.nvram_len; + *new_length = roundup(nvp.nvram_len + 1, 4); + while (pad != *new_length) { + nvp.nvram[pad] = 0; + pad++; } token = *new_length / 4; token = (~token << 16) | (token & 0x0000FFFF); token_le = cpu_to_le32(token); - memcpy(&nvram[*new_length], &token_le, sizeof(token_le)); + memcpy(&nvp.nvram[*new_length], &token_le, sizeof(token_le)); *new_length += sizeof(token_le); - return nvram; + return nvp.nvram; } void brcmf_nvram_free(void *nvram) @@ -91,4 +224,3 @@ void brcmf_nvram_free(void *nvram) kfree(nvram); } - |