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diff --git a/src/hardware/gwinstek-gpd/protocol.h b/src/hardware/gwinstek-gpd/protocol.h
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+++ b/src/hardware/gwinstek-gpd/protocol.h
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+/*
+ * This file is part of the libsigrok project.
+ *
+ * Copyright (C) 2018 Bastian Schmitz <bastian.schmitz@udo.edu>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LIBSIGROK_HARDWARE_GWINSTEK_GPD_PROTOCOL_H
+#define LIBSIGROK_HARDWARE_GWINSTEK_GPD_PROTOCOL_H
+
+#include <stdint.h>
+#include <glib.h>
+#include <libsigrok/libsigrok.h>
+#include "libsigrok-internal.h"
+
+#define LOG_PREFIX "gwinstek-gpd"
+
+enum {
+	GPD_2303S,
+};
+
+/* Maximum number of output channels handled by this driver. */
+#define MAX_CHANNELS 2
+
+#define CHANMODE_INDEPENDENT (1 << 0)
+#define CHANMODE_SERIES      (1 << 1)
+#define CHANMODE_PARALLEL    (1 << 2)
+
+struct channel_spec {
+	/* Min, max, step. */
+	gdouble voltage[3];
+	gdouble current[3];
+};
+
+struct gpd_model {
+	int modelid;
+	const char *name;
+	int channel_modes;
+	unsigned int num_channels;
+	struct channel_spec channels[MAX_CHANNELS];
+};
+
+struct per_channel_config {
+	/* Received from device. */
+	float output_voltage_last;
+	float output_current_last;
+	/* Set by frontend. */
+	float output_voltage_max;
+	float output_current_max;
+};
+
+struct dev_context {
+	/* Received from device. */
+	gboolean output_enabled;
+	int64_t req_sent_at;
+	gboolean reply_pending;
+
+	struct sr_sw_limits limits;
+	int channel_mode;
+	struct per_channel_config *config;
+	const struct gpd_model *model;
+};
+
+SR_PRIV int gpd_send_cmd(struct sr_serial_dev_inst *serial, const char *cmd, ...);
+SR_PRIV int gpd_receive_data(int fd, int revents, void *cb_data);
+SR_PRIV int gpd_receive_reply(struct sr_serial_dev_inst *serial, char *buf, int buflen);
+
+#endif