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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2022-2024 Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
#include <stdlib.h>
#include "common.h"
int gpiocli_get_main(int argc, char **argv)
{
static const gchar *const summary =
"Get values of one or more GPIO lines.";
static const gchar *const description =
"If -r/--request is specified then all the lines must belong to the same\n"
"request (and - by extension - the same chip).\n"
"\n"
"If no lines are specified but -r/--request was passed then all lines within\n"
"the request will be used.";
const gchar *request_name = NULL, *chip_path, *req_path;
gboolean ret, unquoted = FALSE, numeric = FALSE;
g_autoptr(GpiodbusObject) chip_obj = NULL;
g_autoptr(GpiodbusObject) req_obj = NULL;
g_autoptr(GArray) offsets = NULL;
g_autoptr(GArray) values = NULL;
g_autoptr(GError) err = NULL;
g_auto(GStrv) lines = NULL;
GpiodbusRequest *request;
GVariantBuilder builder;
GpiodbusLine *line;
gsize num_lines, i;
GVariantIter iter;
guint offset;
gint value;
const GOptionEntry opts[] = {
{
.long_name = "request",
.short_name = 'r',
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING,
.arg_data = &request_name,
.description = "restrict scope to a particular request",
.arg_description = "<request>",
},
{
.long_name = "unquoted",
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_NONE,
.arg_data = &unquoted,
.description = "don't quote line names",
},
{
.long_name = "numeric",
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_NONE,
.arg_data = &numeric,
.description = "display line values as '0' (inactive) or '1' (active)",
},
{
.long_name = G_OPTION_REMAINING,
.flags = G_OPTION_FLAG_NONE,
.arg = G_OPTION_ARG_STRING_ARRAY,
.arg_data = &lines,
.arg_description = "[line0] [line1]...",
},
{ }
};
parse_options(opts, summary, description, &argc, &argv);
check_manager();
if (!lines && !request_name)
die_parsing_opts("either at least one line or the request must be specified");
offsets = g_array_new(FALSE, TRUE, sizeof(guint));
num_lines = lines ? g_strv_length(lines) : 0;
if (!request_name) {
/*
* TODO Limit the number of D-Bus calls by gathering the requests
* and their relevant lines into a container of some kind first.
*/
values = g_array_sized_new(FALSE, TRUE, sizeof(gint),
num_lines);
for (i = 0; i < num_lines; i++) {
g_autoptr(GpiodbusRequest) req_proxy = NULL;
g_autoptr(GpiodbusObject) line_obj = NULL;
g_autoptr(GVariant) arg_offsets = NULL;
g_autoptr(GVariant) arg_values = NULL;
ret = get_line_obj_by_name(lines[i], &line_obj, NULL);
if (!ret)
die("Line not found: %s\n", lines[i]);
line = gpiodbus_object_peek_line(line_obj);
req_path = gpiodbus_line_get_request_path(line);
if (!gpiodbus_line_get_managed(line))
die("Line '%s' not managed by gpio-manager, must be requested first",
lines[i]);
req_proxy = gpiodbus_request_proxy_new_for_bus_sync(
G_BUS_TYPE_SYSTEM,
G_DBUS_PROXY_FLAGS_NONE,
"io.gpiod1", req_path,
NULL, &err);
if (err)
die_gerror(err,
"Failed to get D-Bus proxy for '%s'",
req_path);
offset = gpiodbus_line_get_offset(line);
g_array_append_val(offsets, offset);
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
g_variant_builder_add(&builder, "u", offset);
arg_offsets = g_variant_ref_sink(
g_variant_builder_end(&builder));
ret = gpiodbus_request_call_get_values_sync(
req_proxy, arg_offsets,
G_DBUS_CALL_FLAGS_NONE,
-1, &arg_values, NULL,
&err);
if (!ret)
die_gerror(err, "Failed to get line values");
g_variant_iter_init(&iter, arg_values);
while (g_variant_iter_next(&iter, "i", &value))
g_array_append_val(values, value);
}
} else {
g_autoptr(GVariant) arg_offsets = NULL;
g_autoptr(GVariant) arg_values = NULL;
req_obj = get_request_obj(request_name);
request = gpiodbus_object_peek_request(req_obj);
chip_path = gpiodbus_request_get_chip_path(request);
chip_obj = get_chip_obj_by_path(chip_path);
if (lines) {
for (i = 0; i < num_lines; i++) {
g_autoptr(GpiodbusObject) line_obj = NULL;
line_obj = get_line_obj_by_name_for_chip(
chip_obj, lines[i]);
if (!line_obj)
die("Line not found: %s\n", lines[i]);
line = gpiodbus_object_peek_line(line_obj);
if (!gpiodbus_line_get_managed(line))
die("Line '%s' not managed by gpio-manager, must be requested first",
lines[i]);
offset = gpiodbus_line_get_offset(line);
g_array_append_val(offsets, offset);
}
} else {
offsets = get_request_offsets(request);
num_lines = offsets->len;
}
g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
for (i = 0; i < offsets->len; i++)
g_variant_builder_add(&builder, "u",
g_array_index(offsets, guint, i));
arg_offsets = g_variant_ref_sink(
g_variant_builder_end(&builder));
ret = gpiodbus_request_call_get_values_sync(
request, arg_offsets,
G_DBUS_CALL_FLAGS_NONE,
-1, &arg_values, NULL,
&err);
if (!ret)
die_gerror(err, "Failed to get line values");
values = g_array_sized_new(FALSE, TRUE, sizeof(gint),
g_variant_n_children(arg_values));
g_variant_iter_init(&iter, arg_values);
while (g_variant_iter_next(&iter, "i", &value))
g_array_append_val(values, value);
}
for (i = 0; i < num_lines; i++) {
if (!unquoted)
g_print("\"");
if (lines)
g_print("%s", lines[i]);
else
g_print("%u", g_array_index(offsets, guint, i));
if (!unquoted)
g_print("\"");
g_print("=%s", g_array_index(values, guint, i) ?
numeric ? "1" : "active" :
numeric ? "0" : "inactive");
if (i != (num_lines - 1))
g_print(" ");
}
g_print("\n");
return EXIT_SUCCESS;
}
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