drivers/media/video/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  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #
  27 #include "cx23885.h"
  28 #include "netup-eeprom.h"
  29
  30 #define EEPROM_I2C_ADDR 0x50
  31
  32 int netup_eeprom_read(struct i2c_adapter *i2c_adap, u8 addr)
  33 {
  34         int ret;
  35         unsigned char buf[2];
  36
  37         /* Read from EEPROM */
  38         struct i2c_msg msg[] = {
  39                 {
  40                         .addr   = EEPROM_I2C_ADDR,
  41                         .flags  = 0,
  42                         .buf    = &buf[0],
  43                         .len    = 1
  44                 }, {
  45                         .addr   = EEPROM_I2C_ADDR,
  46                         .flags  = I2C_M_RD,
  47                         .buf    = &buf[1],
  48                         .len    = 1
  49                 }
  50
  51         };
  52
  53         buf[0] = addr;
  54         buf[1] = 0x0;
  55
  56         ret = i2c_transfer(i2c_adap, msg, 2);
  57
  58         if (ret != 2) {
  59                 printk(KERN_ERR "eeprom i2c read error, status=%d\n", ret);
  60                 return -1;
  61         }
  62
  63         return buf[1];
  64 };
  65
  66 int netup_eeprom_write(struct i2c_adapter *i2c_adap, u8 addr, u8 data)
  67 {
  68         int ret;
  69         unsigned char bufw[2];
  70
  71         /* Write into EEPROM */
  72         struct i2c_msg msg[] = {
  73                 {
  74                         .addr   = EEPROM_I2C_ADDR,
  75                         .flags  = 0,
  76                         .buf    = &bufw[0],
  77                         .len    = 2
  78                 }
  79         };
  80
  81         bufw[0] = addr;
  82         bufw[1] = data;
  83
  84         ret = i2c_transfer(i2c_adap, msg, 1);
  85
  86         if (ret != 1) {
  87                 printk(KERN_ERR "eeprom i2c write error, status=%d\n", ret);
  88                 return -1;
  89         }
  90
  91         mdelay(10); /* prophylactic delay, datasheet write cycle time = 5 ms */
  92         return 0;
  93 };
  94
  95 void netup_get_card_info(struct i2c_adapter *i2c_adap,
  96                                 struct netup_card_info *cinfo)
  97 {
  98         int i, j;
  99
 100         cinfo->rev =  netup_eeprom_read(i2c_adap, 63);
 101
 102         for (i = 64, j = 0; i < 70; i++, j++)
 103                 cinfo->port[0].mac[j] =  netup_eeprom_read(i2c_adap, i);
 104
 105         for (i = 70, j = 0; i < 76; i++, j++)
 106                 cinfo->port[1].mac[j] =  netup_eeprom_read(i2c_adap, i);
 107 };