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
  28 int 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
  62 int 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
  91 void 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 };