linux/drivers/media/pci/cx23885/netup-eeprom.c

// SPDX-License-Identifier: GPL-2.0-or-later

/*
 * netup-eeprom.c
 *
 * 24LC02 EEPROM driver in conjunction with NetUP Dual DVB-S2 CI card
 *
 * Copyright (C) 2009 NetUP Inc.
 * Copyright (C) 2009 Abylay Ospan <aospan@netup.ru>
 */

#
#include "cx23885.h"
#include "netup-eeprom.h"

#define EEPROM_I2C_ADDR 0x50

int netup_eeprom_read(struct i2c_adapter *i2c_adap, u8 addr)
{
	int ret;
	unsigned char buf[2];

	/* Read from EEPROM */
	struct i2c_msg msg[] = {
		{
			.addr	= EEPROM_I2C_ADDR,
			.flags	= 0,
			.buf	= &buf[0],
			.len	= 1
		}, {
			.addr	= EEPROM_I2C_ADDR,
			.flags	= I2C_M_RD,
			.buf	= &buf[1],
			.len	= 1
		}

	};

	buf[0] = addr;
	buf[1] = 0x0;

	ret = i2c_transfer(i2c_adap, msg, 2);

	if (ret != 2) {
		pr_err("eeprom i2c read error, status=%d\n", ret);
		return -1;
	}

	return buf[1];
};

int netup_eeprom_write(struct i2c_adapter *i2c_adap, u8 addr, u8 data)
{
	int ret;
	unsigned char bufw[2];

	/* Write into EEPROM */
	struct i2c_msg msg[] = {
		{
			.addr	= EEPROM_I2C_ADDR,
			.flags	= 0,
			.buf	= &bufw[0],
			.len	= 2
		}
	};

	bufw[0] = addr;
	bufw[1] = data;

	ret = i2c_transfer(i2c_adap, msg, 1);

	if (ret != 1) {
		pr_err("eeprom i2c write error, status=%d\n", ret);
		return -1;
	}

	mdelay(10); /* prophylactic delay, datasheet write cycle time = 5 ms */
	return 0;
};

void netup_get_card_info(struct i2c_adapter *i2c_adap,
				struct netup_card_info *cinfo)
{
	int i, j;

	cinfo->rev =  netup_eeprom_read(i2c_adap, 63);

	for (i = 64, j = 0; i < 70; i++, j++)
		cinfo->port[0].mac[j] =  netup_eeprom_read(i2c_adap, i);

	for (i = 70, j = 0; i < 76; i++, j++)
		cinfo->port[1].mac[j] =  netup_eeprom_read(i2c_adap, i);
};