summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/brcm80211/brcmfmac/firmware.c
blob: 9cb99152ad1753e2bc2317589ce75df7abebd08b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
/*
 * Copyright (c) 2013 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/firmware.h>
#include <linux/module.h>

#include "debug.h"
#include "firmware.h"

char brcmf_firmware_path[BRCMF_FW_PATH_LEN];
module_param_string(firmware_path, brcmf_firmware_path,
		    BRCMF_FW_PATH_LEN, 0440);

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 == '=') {
		/* ignore RAW1 by treating as comment */
		if (strncmp(&nvp->fwnv->data[nvp->entry], "RAW1", 4) == 0)
			st = COMMENT;
		else
			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.
 */
static void *brcmf_fw_nvram_strip(const struct firmware *nv, u32 *new_length)
{
	struct nvram_parser nvp;
	u32 pad;
	u32 token;
	__le32 token_le;

	if (brcmf_init_nvram_parser(&nvp, nv) < 0)
		return NULL;

	while (nvp.pos < nv->size) {
		nvp.state = nv_parser_states[nvp.state](&nvp);
		if (nvp.state == END)
			break;
	}
	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(&nvp.nvram[*new_length], &token_le, sizeof(token_le));
	*new_length += sizeof(token_le);

	return nvp.nvram;
}

void brcmf_fw_nvram_free(void *nvram)
{
	kfree(nvram);
}

struct brcmf_fw {
	struct device *dev;
	u16 flags;
	const struct firmware *code;
	const char *nvram_name;
	void (*done)(struct device *dev, const struct firmware *fw,
		     void *nvram_image, u32 nvram_len);
};

static void brcmf_fw_request_nvram_done(const struct firmware *fw, void *ctx)
{
	struct brcmf_fw *fwctx = ctx;
	u32 nvram_length = 0;
	void *nvram = NULL;

	brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(fwctx->dev));
	if (!fw && !(fwctx->flags & BRCMF_FW_REQ_NV_OPTIONAL))
		goto fail;

	if (fw) {
		nvram = brcmf_fw_nvram_strip(fw, &nvram_length);
		release_firmware(fw);
		if (!nvram && !(fwctx->flags & BRCMF_FW_REQ_NV_OPTIONAL))
			goto fail;
	}

	fwctx->done(fwctx->dev, fwctx->code, nvram, nvram_length);
	kfree(fwctx);
	return;

fail:
	brcmf_dbg(TRACE, "failed: dev=%s\n", dev_name(fwctx->dev));
	release_firmware(fwctx->code);
	device_release_driver(fwctx->dev);
	kfree(fwctx);
}

static void brcmf_fw_request_code_done(const struct firmware *fw, void *ctx)
{
	struct brcmf_fw *fwctx = ctx;
	int ret;

	brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(fwctx->dev));
	if (!fw)
		goto fail;

	/* only requested code so done here */
	if (!(fwctx->flags & BRCMF_FW_REQUEST_NVRAM)) {
		fwctx->done(fwctx->dev, fw, NULL, 0);
		kfree(fwctx);
		return;
	}
	fwctx->code = fw;
	ret = request_firmware_nowait(THIS_MODULE, true, fwctx->nvram_name,
				      fwctx->dev, GFP_KERNEL, fwctx,
				      brcmf_fw_request_nvram_done);

	if (!ret)
		return;

	/* when nvram is optional call .done() callback here */
	if (fwctx->flags & BRCMF_FW_REQ_NV_OPTIONAL) {
		fwctx->done(fwctx->dev, fw, NULL, 0);
		kfree(fwctx);
		return;
	}

	/* failed nvram request */
	release_firmware(fw);
fail:
	brcmf_dbg(TRACE, "failed: dev=%s\n", dev_name(fwctx->dev));
	device_release_driver(fwctx->dev);
	kfree(fwctx);
}

int brcmf_fw_get_firmwares(struct device *dev, u16 flags,
			   const char *code, const char *nvram,
			   void (*fw_cb)(struct device *dev,
					 const struct firmware *fw,
					 void *nvram_image, u32 nvram_len))
{
	struct brcmf_fw *fwctx;

	brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(dev));
	if (!fw_cb || !code)
		return -EINVAL;

	if ((flags & BRCMF_FW_REQUEST_NVRAM) && !nvram)
		return -EINVAL;

	fwctx = kzalloc(sizeof(*fwctx), GFP_KERNEL);
	if (!fwctx)
		return -ENOMEM;

	fwctx->dev = dev;
	fwctx->flags = flags;
	fwctx->done = fw_cb;
	if (flags & BRCMF_FW_REQUEST_NVRAM)
		fwctx->nvram_name = nvram;

	return request_firmware_nowait(THIS_MODULE, true, code, dev,
				       GFP_KERNEL, fwctx,
				       brcmf_fw_request_code_done);
}