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Use firmware path from sysfs

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Some linux distributions adjust path fro kernel to load
firmware from using /sys/module/firmware_class/parameters/path.
Kernel supports it, teach tqftpserv to respect it too.

Signed-off-by: Alexey Minnekhanov <alexeymin@postmarketos.org>
This commit is contained in:
Alexey Minnekhanov 2024-01-08 05:58:40 +03:00 committed by Alexey Minnekhanov
parent 289214a5d1
commit a4c755db17
1 changed files with 34 additions and 0 deletions
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34
translate.c
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@ -53,6 +53,20 @@
#define TQFTPSERV_TMP "/data/vendor/tmp/tqftpserv"
#endif
static void read_fw_path_from_sysfs(char *outbuffer, size_t bufsize)
{
size_t pathsize;
FILE *f = fopen("/sys/module/firmware_class/parameters/path", "rt");
if (!f)
return;
pathsize = fread(outbuffer, sizeof(char), bufsize, f);
fclose(f);
if (pathsize == 0)
return;
/* truncate newline */
outbuffer[pathsize - 1] = '\0';
}
/**
* translate_readonly() - open "file" residing with remoteproc firmware
* @file: file requested, stripped of "/readonly/image/" prefix
@ -72,6 +86,7 @@ static int translate_readonly(const char *file)
char firmware_value[PATH_MAX];
char firmware_attr[32];
char path[PATH_MAX];
char fw_sysfs_path[PATH_MAX];
struct dirent *de;
int firmware_fd;
DIR *class_dir;
@ -79,6 +94,8 @@ static int translate_readonly(const char *file)
ssize_t n;
int fd = -1;
read_fw_path_from_sysfs(fw_sysfs_path, sizeof(fw_sysfs_path));
class_fd = open("/sys/class/remoteproc", O_RDONLY | O_DIRECTORY);
if (class_fd < 0) {
warn("failed to open remoteproc class");
@ -112,6 +129,23 @@ static int translate_readonly(const char *file)
}
firmware_value[n] = '\0';
/* first try path from sysfs */
if ((strlen(fw_sysfs_path) > 0) &&
(strlen(fw_sysfs_path) + 1 + strlen(firmware_value) + 1 + strlen(file) + 1 < sizeof(path))) {
strcpy(path, fw_sysfs_path);
strcat(path, "/");
strcat(path, dirname(firmware_value));
strcat(path, "/");
strcat(path, file);
fd = open(path, O_RDONLY);
if (fd >= 0)
break;
if (errno != ENOENT)
warn("failed to open %s", path);
}
/* now try with base path */
if (strlen(FIRMWARE_BASE) + strlen(firmware_value) + 1 +
strlen(file) + 1 > sizeof(path))
continue;