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