drivers/gpu/drm/nouveau/core/include/subdev/i2c.h

#ifndef __NOUVEAU_I2C_H__
#define __NOUVEAU_I2C_H__

#include <core/subdev.h>
#include <core/device.h>

#include <subdev/bios.h>
#include <subdev/bios/i2c.h>

#define NV_I2C_PORT(n)    (0x00 + (n))
#define NV_I2C_DEFAULT(n) (0x80 + (n))

struct nouveau_i2c_port {
	struct i2c_adapter adapter;
	struct nouveau_i2c *i2c;
	struct i2c_algo_bit_data bit;
	struct list_head head;
	u8  index;
	u8  type;
	u32 dcb;
	u32 drive;
	u32 sense;
	u32 state;
};

struct nouveau_i2c {
	struct nouveau_subdev base;

	struct nouveau_i2c_port *(*find)(struct nouveau_i2c *, u8 index);
	int (*identify)(struct nouveau_i2c *, int index,
			const char *what, struct i2c_board_info *,
			bool (*match)(struct nouveau_i2c_port *,
				      struct i2c_board_info *));
	struct list_head ports;
};

static inline struct nouveau_i2c *
nouveau_i2c(void *obj)
{
	return (void *)nv_device(obj)->subdev[NVDEV_SUBDEV_I2C];
}

extern struct nouveau_oclass nouveau_i2c_oclass;

void nouveau_i2c_drive_scl(void *, int);
void nouveau_i2c_drive_sda(void *, int);
int  nouveau_i2c_sense_scl(void *);
int  nouveau_i2c_sense_sda(void *);

int  nv_rdi2cr(struct nouveau_i2c_port *, u8 addr, u8 reg);
int  nv_wri2cr(struct nouveau_i2c_port *, u8 addr, u8 reg, u8 val);
bool nv_probe_i2c(struct nouveau_i2c_port *, u8 addr);

int nv_rdaux(struct nouveau_i2c_port *, u32 addr, u8 *data, u8 size);
int nv_wraux(struct nouveau_i2c_port *, u32 addr, u8 *data, u8 size);

extern const struct i2c_algorithm nouveau_i2c_bit_algo;
extern const struct i2c_algorithm nouveau_i2c_aux_algo;

#endif