i2c_sfp.h

#ifndef I2C_SFP_H
#define I2C_SFP_H

#include "i2c.h"

#include <libwr/sfp_lib.h>

//address from AT24C01 datasheet (1k, all address lines shorted to the ground)
#define I2C_SFP_ADDRESS 0x50
// From SFF-8472, but right-shifted one bit as I2C addresses are only 7 bits.
#define I2C_SFP_DOM_ADDRESS 0x51

/* The two FPGA buses */
#define WR_FPGA_BUS0	0
#define WR_FPGA_BUS1	1
/* The multiplexer bus */
#define WR_MUX_BUS	2
/* Individual buses. 0 and 1 are weird  */
#define WR_SFP0_BUS	3
#define WR_SFP1_BUS	4

extern struct i2c_bus i2c_buses[];

/**
 * Initializes all the buses related to SFP control. These include:
 *     - FPGA buses x 2
 *     - Bitbanged bus to muxes
 *     - Bitbanged buses to SFP link0 and link1
 * @return: 0 on success, -1 on error
 */
int shw_sfp_buses_init(void);

/* Iniialize all GPIO's related to SFP's */
void shw_sfp_gpio_init(void);

/*
 * Scan a specific bus. Use the bus defines on the top of this header
 * The return value is the number of devices discovered on the bus.
 * The dev_map array should be at least 16 bytes in size to cover the
 * 128 possible addresses. The dev_map is set to a bitmask representing
 * which devices are present.
 */
int shw_sfp_bus_scan(int num, uint8_t * dev_map);

/* Read a header from a specific port (num = 0..17) */
int shw_sfp_read_header(int num, struct shw_sfp_header *head);
/* Verify the base part of an SFP header (first 64 bytes) */
int shw_sfp_header_verify_base(struct shw_sfp_header *head);
/* Verify the extended part of an SFP header (bytes 64 to 94) */
int shw_sfp_header_verify_ext(struct shw_sfp_header *head);
/* Verify both base and extended parts of SFP header */
int shw_sfp_header_verify(struct shw_sfp_header *head);
/* Print information about an SFP header */
void shw_sfp_print_header(struct shw_sfp_header *head);
/* Dump the hex output of an SFP header (12 lines of 8 bytes each) */
void shw_sfp_header_dump(struct shw_sfp_header *head);

/*
 * Read/write to an SFP device.
 * @num:	SFP number (0 to 17)
 * @addr:	i2c address to read/write to/from
 * @off:	Offset to write to (eg. in case of eeprom). Set to -1 to ignore
 * @len:	Length of data
 * @buf:	Buffer with data
 *
 * @return number of bytes sent+received
 */
int32_t shw_sfp_read(int num, uint32_t addr, int off, int len, uint8_t * buf);
int32_t shw_sfp_write(int num, uint32_t addr, int off, int len, uint8_t * buf);

/* Set/get the 4 GPIO's connected to PCA9554's for a particular SFP */
void shw_sfp_gpio_set(int num, uint8_t state);
uint8_t shw_sfp_gpio_get(int num);

#endif //I2C_SFP_H