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// SPDX-License-Identifier: GPL-2.0-only
#include <common.h>
#include <command.h>
#include <fs.h>
#include <getopt.h>
#include <malloc.h>
#include <linux/stat.h>
#include <linux/ctype.h>
#include <environment.h>
static int report(const char *variable, const char *val)
{
if (!val)
return -(errno ?: EINVAL);
if (variable)
return setenv(variable, val);
printf("%s\n", val);
return 0;
}
static int do_devlookup(int argc, char *argv[])
{
const char *variable = NULL, *devicefile, *paramname;
struct cdev *cdev;
int opt;
while ((opt = getopt(argc, argv, "v:")) > 0) {
switch(opt) {
case 'v':
variable = optarg;
break;
}
}
if (argc - optind == 0 || argc - optind > 2)
return COMMAND_ERROR_USAGE;
devicefile = argv[optind];
paramname = argv[optind + 1];
devicefile = devpath_to_name(devicefile);
cdev = cdev_by_name(devicefile);
if (!cdev) {
printf("devlookup: cdev %s not found\n", devicefile);
return -ENOENT;
}
if (!cdev->dev) {
printf("devlookup: cdev %s not associated with a device\n", devicefile);
return -ENODEV;
}
if (paramname)
return report(variable, dev_get_param(cdev->dev, paramname));
return report(variable, dev_name(cdev->dev));
}
BAREBOX_CMD_HELP_START(devlookup)
BAREBOX_CMD_HELP_TEXT("Detects the device behind a device file and outputs it,")
BAREBOX_CMD_HELP_TEXT("unless a second argument is given. In that case the device")
BAREBOX_CMD_HELP_TEXT("parameter with that name is looked up. Specifying -v VARIABLE")
BAREBOX_CMD_HELP_TEXT("will write output to VARIABLE instead of printing it")
BAREBOX_CMD_HELP_END
BAREBOX_CMD_START(devlookup)
.cmd = do_devlookup,
BAREBOX_CMD_DESC("look up device behind device file and its parameters")
BAREBOX_CMD_OPTS("[-v VAR] /dev/DEVICE [parameter]")
BAREBOX_CMD_GROUP(CMD_GRP_SCRIPT)
BAREBOX_CMD_HELP(cmd_devlookup_help)
BAREBOX_CMD_END
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