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

   1
   2/*
   3 * netup-eeprom.c
   4 *
   5 * 24LC02 EEPROM driver in conjunction with NetUP Dual DVB-S2 CI card
   6 *
   7 * Copyright (C) 2009 NetUP Inc.
   8 * Copyright (C) 2009 Abylay Ospan <aospan@netup.ru>
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License as published by
  12 * the Free Software Foundation; either version 2 of the License, or
  13 * (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 *
  19 * GNU General Public License for more details.
  20 */
  21
  22#
  23#include "cx23885.h"
  24#include "netup-eeprom.h"
  25
  26#define EEPROM_I2C_ADDR 0x50
  27
  28int netup_eeprom_read(struct i2c_adapter *i2c_adap, u8 addr)
  29{
  30        int ret;
  31        unsigned char buf[2];
  32
  33        /* Read from EEPROM */
  34        struct i2c_msg msg[] = {
  35                {
  36                        .addr   = EEPROM_I2C_ADDR,
  37                        .flags  = 0,
  38                        .buf    = &buf[0],
  39                        .len    = 1
  40                }, {
  41                        .addr   = EEPROM_I2C_ADDR,
  42                        .flags  = I2C_M_RD,
  43                        .buf    = &buf[1],
  44                        .len    = 1
  45                }
  46
  47        };
  48
  49        buf[0] = addr;
  50        buf[1] = 0x0;
  51
  52        ret = i2c_transfer(i2c_adap, msg, 2);
  53
  54        if (ret != 2) {
  55                pr_err("eeprom i2c read error, status=%d\n", ret);
  56                return -1;
  57        }
  58
  59        return buf[1];
  60};
  61
  62int netup_eeprom_write(struct i2c_adapter *i2c_adap, u8 addr, u8 data)
  63{
  64        int ret;
  65        unsigned char bufw[2];
  66
  67        /* Write into EEPROM */
  68        struct i2c_msg msg[] = {
  69                {
  70                        .addr   = EEPROM_I2C_ADDR,
  71                        .flags  = 0,
  72                        .buf    = &bufw[0],
  73                        .len    = 2
  74                }
  75        };
  76
  77        bufw[0] = addr;
  78        bufw[1] = data;
  79
  80        ret = i2c_transfer(i2c_adap, msg, 1);
  81
  82        if (ret != 1) {
  83                pr_err("eeprom i2c write error, status=%d\n", ret);
  84                return -1;
  85        }
  86
  87        mdelay(10); /* prophylactic delay, datasheet write cycle time = 5 ms */
  88        return 0;
  89};
  90
  91void netup_get_card_info(struct i2c_adapter *i2c_adap,
  92                                struct netup_card_info *cinfo)
  93{
  94        int i, j;
  95
  96        cinfo->rev =  netup_eeprom_read(i2c_adap, 63);
  97
  98        for (i = 64, j = 0; i < 70; i++, j++)
  99                cinfo->port[0].mac[j] =  netup_eeprom_read(i2c_adap, i);
 100
 101        for (i = 70, j = 0; i < 76; i++, j++)
 102                cinfo->port[1].mac[j] =  netup_eeprom_read(i2c_adap, i);
 103};
 104