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diff --git a/include/sound/ac97/controller.h b/include/sound/ac97/controller.h
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+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
+ */
+
+#ifndef AC97_CONTROLLER_H
+#define AC97_CONTROLLER_H
+
+#include <linux/device.h>
+#include <linux/list.h>
+
+#define AC97_BUS_MAX_CODECS 4
+#define AC97_SLOTS_AVAILABLE_ALL 0xf
+
+struct ac97_controller_ops;
+
+/**
+ * struct ac97_controller - The AC97 controller of the AC-Link
+ * @ops: the AC97 operations.
+ * @controllers: linked list of all existing controllers.
+ * @adap: the shell device ac97-%d, ie. ac97 adapter
+ * @nr: the number of the shell device
+ * @slots_available: the mask of accessible/scanable codecs.
+ * @parent: the device providing the AC97 controller.
+ * @codecs: the 4 possible AC97 codecs (NULL if none found).
+ * @codecs_pdata: platform_data for each codec (NULL if no pdata).
+ *
+ * This structure is internal to AC97 bus, and should not be used by the
+ * controllers themselves, excepting for using @dev.
+ */
+struct ac97_controller {
+ const struct ac97_controller_ops *ops;
+ struct list_head controllers;
+ struct device adap;
+ int nr;
+ unsigned short slots_available;
+ struct device *parent;
+ struct ac97_codec_device *codecs[AC97_BUS_MAX_CODECS];
+ void *codecs_pdata[AC97_BUS_MAX_CODECS];
+};
+
+/**
+ * struct ac97_controller_ops - The AC97 operations
+ * @reset: Cold reset of the AC97 AC-Link.
+ * @warm_reset: Warm reset of the AC97 AC-Link.
+ * @read: Read of a single AC97 register.
+ * Returns the register value or a negative error code.
+ * @write: Write of a single AC97 register.
+ *
+ * These are the basic operation an AC97 controller must provide for an AC97
+ * access functions. Amongst these, all but the last 2 are mandatory.
+ * The slot number is also known as the AC97 codec number, between 0 and 3.
+ */
+struct ac97_controller_ops {
+ void (*reset)(struct ac97_controller *adrv);
+ void (*warm_reset)(struct ac97_controller *adrv);
+ int (*write)(struct ac97_controller *adrv, int slot,
+ unsigned short reg, unsigned short val);
+ int (*read)(struct ac97_controller *adrv, int slot, unsigned short reg);
+};
+
+#if IS_ENABLED(CONFIG_AC97_BUS_NEW)
+struct ac97_controller *snd_ac97_controller_register(
+ const struct ac97_controller_ops *ops, struct device *dev,
+ unsigned short slots_available, void **codecs_pdata);
+void snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl);
+#else
+static inline struct ac97_controller *
+snd_ac97_controller_register(const struct ac97_controller_ops *ops,
+ struct device *dev,
+ unsigned short slots_available,
+ void **codecs_pdata)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static inline void
+snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl)
+{
+}
+#endif
+
+#endif