summaryrefslogtreecommitdiff
path: root/drivers/fastboot/fb_getvar.c
blob: 467a8618fe3cf80e5611a8a7c7b018e630137719 (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
// SPDX-License-Identifier: BSD-2-Clause
/*
 * Copyright (C) 2016 The Android Open Source Project
 */

#include <common.h>
#include <env.h>
#include <fastboot.h>
#include <fastboot-internal.h>
#include <fb_mmc.h>
#include <fb_nand.h>
#include <fs.h>
#include <version.h>

static void getvar_version(char *var_parameter, char *response);
static void getvar_version_bootloader(char *var_parameter, char *response);
static void getvar_downloadsize(char *var_parameter, char *response);
static void getvar_serialno(char *var_parameter, char *response);
static void getvar_version_baseband(char *var_parameter, char *response);
static void getvar_product(char *var_parameter, char *response);
static void getvar_platform(char *var_parameter, char *response);
static void getvar_current_slot(char *var_parameter, char *response);
#if CONFIG_IS_ENABLED(FASTBOOT_FLASH)
static void getvar_has_slot(char *var_parameter, char *response);
#endif
#if CONFIG_IS_ENABLED(FASTBOOT_FLASH_MMC)
static void getvar_partition_type(char *part_name, char *response);
#endif
#if CONFIG_IS_ENABLED(FASTBOOT_FLASH)
static void getvar_partition_size(char *part_name, char *response);
#endif
static void getvar_is_userspace(char *var_parameter, char *response);

static const struct {
	const char *variable;
	void (*dispatch)(char *var_parameter, char *response);
} getvar_dispatch[] = {
	{
		.variable = "version",
		.dispatch = getvar_version
	}, {
		.variable = "version-bootloader",
		.dispatch = getvar_version_bootloader
	}, {
		.variable = "downloadsize",
		.dispatch = getvar_downloadsize
	}, {
		.variable = "max-download-size",
		.dispatch = getvar_downloadsize
	}, {
		.variable = "serialno",
		.dispatch = getvar_serialno
	}, {
		.variable = "version-baseband",
		.dispatch = getvar_version_baseband
	}, {
		.variable = "product",
		.dispatch = getvar_product
	}, {
		.variable = "platform",
		.dispatch = getvar_platform
	}, {
		.variable = "current-slot",
		.dispatch = getvar_current_slot
#if CONFIG_IS_ENABLED(FASTBOOT_FLASH)
	}, {
		.variable = "has-slot",
		.dispatch = getvar_has_slot
#endif
#if CONFIG_IS_ENABLED(FASTBOOT_FLASH_MMC)
	}, {
		.variable = "partition-type",
		.dispatch = getvar_partition_type
#endif
#if CONFIG_IS_ENABLED(FASTBOOT_FLASH)
	}, {
		.variable = "partition-size",
		.dispatch = getvar_partition_size
#endif
	}, {
		.variable = "is-userspace",
		.dispatch = getvar_is_userspace
	}
};

#if CONFIG_IS_ENABLED(FASTBOOT_FLASH)
/**
 * Get partition number and size for any storage type.
 *
 * Can be used to check if partition with specified name exists.
 *
 * If error occurs, this function guarantees to fill @p response with fail
 * string. @p response can be rewritten in caller, if needed.
 *
 * @param[in] part_name Info for which partition name to look for
 * @param[in,out] response Pointer to fastboot response buffer
 * @param[out] size If not NULL, will contain partition size (in blocks)
 * @return Partition number or negative value on error
 */
static int getvar_get_part_info(const char *part_name, char *response,
				size_t *size)
{
	int r;
# if CONFIG_IS_ENABLED(FASTBOOT_FLASH_MMC)
	struct blk_desc *dev_desc;
	struct disk_partition part_info;

	r = fastboot_mmc_get_part_info(part_name, &dev_desc, &part_info,
				       response);
	if (r >= 0 && size)
		*size = part_info.size;
# elif CONFIG_IS_ENABLED(FASTBOOT_FLASH_NAND)
	struct part_info *part_info;

	r = fastboot_nand_get_part_info(part_name, &part_info, response);
	if (r >= 0 && size)
		*size = part_info->size;
# else
	fastboot_fail("this storage is not supported in bootloader", response);
	r = -ENODEV;
# endif

	return r;
}
#endif

static void getvar_version(char *var_parameter, char *response)
{
	fastboot_okay(FASTBOOT_VERSION, response);
}

static void getvar_version_bootloader(char *var_parameter, char *response)
{
	fastboot_okay(U_BOOT_VERSION, response);
}

static void getvar_downloadsize(char *var_parameter, char *response)
{
	fastboot_response("OKAY", response, "0x%08x", fastboot_buf_size);
}

static void getvar_serialno(char *var_parameter, char *response)
{
	const char *tmp = env_get("serial#");

	if (tmp)
		fastboot_okay(tmp, response);
	else
		fastboot_fail("Value not set", response);
}

static void getvar_version_baseband(char *var_parameter, char *response)
{
	fastboot_okay("N/A", response);
}

static void getvar_product(char *var_parameter, char *response)
{
	const char *board = env_get("board");

	if (board)
		fastboot_okay(board, response);
	else
		fastboot_fail("Board not set", response);
}

static void getvar_platform(char *var_parameter, char *response)
{
	const char *p = env_get("platform");

	if (p)
		fastboot_okay(p, response);
	else
		fastboot_fail("platform not set", response);
}

static void getvar_current_slot(char *var_parameter, char *response)
{
	/* A/B not implemented, for now always return "a" */
	fastboot_okay("a", response);
}

#if CONFIG_IS_ENABLED(FASTBOOT_FLASH)
static void getvar_has_slot(char *part_name, char *response)
{
	char part_name_wslot[PART_NAME_LEN];
	size_t len;
	int r;

	if (!part_name || part_name[0] == '\0')
		goto fail;

	/* part_name_wslot = part_name + "_a" */
	len = strlcpy(part_name_wslot, part_name, PART_NAME_LEN - 3);
	if (len > PART_NAME_LEN - 3)
		goto fail;
	strcat(part_name_wslot, "_a");

	r = getvar_get_part_info(part_name_wslot, response, NULL);
	if (r >= 0) {
		fastboot_okay("yes", response); /* part exists and slotted */
		return;
	}

	r = getvar_get_part_info(part_name, response, NULL);
	if (r >= 0)
		fastboot_okay("no", response); /* part exists but not slotted */

	/* At this point response is filled with okay or fail string */
	return;

fail:
	fastboot_fail("invalid partition name", response);
}
#endif

#if CONFIG_IS_ENABLED(FASTBOOT_FLASH_MMC)
static void getvar_partition_type(char *part_name, char *response)
{
	int r;
	struct blk_desc *dev_desc;
	struct disk_partition part_info;

	r = fastboot_mmc_get_part_info(part_name, &dev_desc, &part_info,
				       response);
	if (r >= 0) {
		r = fs_set_blk_dev_with_part(dev_desc, r);
		if (r < 0)
			fastboot_fail("failed to set partition", response);
		else
			fastboot_okay(fs_get_type_name(), response);
	}
}
#endif

#if CONFIG_IS_ENABLED(FASTBOOT_FLASH)
static void getvar_partition_size(char *part_name, char *response)
{
	int r;
	size_t size;

	r = getvar_get_part_info(part_name, response, &size);
	if (r >= 0)
		fastboot_response("OKAY", response, "0x%016zx", size);
}
#endif

static void getvar_is_userspace(char *var_parameter, char *response)
{
	fastboot_okay("no", response);
}

/**
 * fastboot_getvar() - Writes variable indicated by cmd_parameter to response.
 *
 * @cmd_parameter: Pointer to command parameter
 * @response: Pointer to fastboot response buffer
 *
 * Look up cmd_parameter first as an environment variable of the form
 * fastboot.<cmd_parameter>, if that exists return use its value to set
 * response.
 *
 * Otherwise lookup the name of variable and execute the appropriate
 * function to return the requested value.
 */
void fastboot_getvar(char *cmd_parameter, char *response)
{
	if (!cmd_parameter) {
		fastboot_fail("missing var", response);
	} else {
#define FASTBOOT_ENV_PREFIX	"fastboot."
		int i;
		char *var_parameter = cmd_parameter;
		char envstr[FASTBOOT_RESPONSE_LEN];
		const char *s;

		snprintf(envstr, sizeof(envstr) - 1,
			 FASTBOOT_ENV_PREFIX "%s", cmd_parameter);
		s = env_get(envstr);
		if (s) {
			fastboot_response("OKAY", response, "%s", s);
			return;
		}

		strsep(&var_parameter, ":");
		for (i = 0; i < ARRAY_SIZE(getvar_dispatch); ++i) {
			if (!strcmp(getvar_dispatch[i].variable,
				    cmd_parameter)) {
				getvar_dispatch[i].dispatch(var_parameter,
							    response);
				return;
			}
		}
		pr_warn("WARNING: unknown variable: %s\n", cmd_parameter);
		fastboot_fail("Variable not implemented", response);
	}
}