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| 1 | /* SPDX-License-Identifier: GPL-2.0 |
|---|---|
| 2 | * |
| 3 | * Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr> |
| 4 | */ |
| 5 | |
| 6 | #ifndef AC97_CONTROLLER_H |
| 7 | #define AC97_CONTROLLER_H |
| 8 | |
| 9 | #include <linux/device.h> |
| 10 | #include <linux/list.h> |
| 11 | |
| 12 | #define AC97_BUS_MAX_CODECS 4 |
| 13 | #define AC97_SLOTS_AVAILABLE_ALL 0xf |
| 14 | |
| 15 | struct ac97_controller_ops; |
| 16 | |
| 17 | /** |
| 18 | * struct ac97_controller - The AC97 controller of the AC-Link |
| 19 | * @ops: the AC97 operations. |
| 20 | * @controllers: linked list of all existing controllers. |
| 21 | * @adap: the shell device ac97-%d, ie. ac97 adapter |
| 22 | * @nr: the number of the shell device |
| 23 | * @slots_available: the mask of accessible/scanable codecs. |
| 24 | * @parent: the device providing the AC97 controller. |
| 25 | * @codecs: the 4 possible AC97 codecs (NULL if none found). |
| 26 | * @codecs_pdata: platform_data for each codec (NULL if no pdata). |
| 27 | * |
| 28 | * This structure is internal to AC97 bus, and should not be used by the |
| 29 | * controllers themselves, excepting for using @dev. |
| 30 | */ |
| 31 | struct ac97_controller { |
| 32 | const struct ac97_controller_ops *ops; |
| 33 | struct list_head controllers; |
| 34 | struct device adap; |
| 35 | int nr; |
| 36 | unsigned short slots_available; |
| 37 | struct device *parent; |
| 38 | struct ac97_codec_device *codecs[AC97_BUS_MAX_CODECS]; |
| 39 | void *codecs_pdata[AC97_BUS_MAX_CODECS]; |
| 40 | }; |
| 41 | |
| 42 | /** |
| 43 | * struct ac97_controller_ops - The AC97 operations |
| 44 | * @reset: Cold reset of the AC97 AC-Link. |
| 45 | * @warm_reset: Warm reset of the AC97 AC-Link. |
| 46 | * @read: Read of a single AC97 register. |
| 47 | * Returns the register value or a negative error code. |
| 48 | * @write: Write of a single AC97 register. |
| 49 | * |
| 50 | * These are the basic operation an AC97 controller must provide for an AC97 |
| 51 | * access functions. Amongst these, all but the last 2 are mandatory. |
| 52 | * The slot number is also known as the AC97 codec number, between 0 and 3. |
| 53 | */ |
| 54 | struct ac97_controller_ops { |
| 55 | void (*reset)(struct ac97_controller *adrv); |
| 56 | void (*warm_reset)(struct ac97_controller *adrv); |
| 57 | int (*write)(struct ac97_controller *adrv, int slot, |
| 58 | unsigned short reg, unsigned short val); |
| 59 | int (*read)(struct ac97_controller *adrv, int slot, unsigned short reg); |
| 60 | }; |
| 61 | |
| 62 | #if IS_ENABLED(CONFIG_AC97_BUS_NEW) |
| 63 | struct ac97_controller *snd_ac97_controller_register( |
| 64 | const struct ac97_controller_ops *ops, struct device *dev, |
| 65 | unsigned short slots_available, void **codecs_pdata); |
| 66 | void snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl); |
| 67 | #else |
| 68 | static inline struct ac97_controller * |
| 69 | snd_ac97_controller_register(const struct ac97_controller_ops *ops, |
| 70 | struct device *dev, |
| 71 | unsigned short slots_available, |
| 72 | void **codecs_pdata) |
| 73 | { |
| 74 | return ERR_PTR(-ENODEV); |
| 75 | } |
| 76 | |
| 77 | static inline void |
| 78 | snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl) |
| 79 | { |
| 80 | } |
| 81 | #endif |
| 82 | |
| 83 | #endif |
| 84 |
Warning: This file is not a C or C++ file. It does not have highlighting.