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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /*
   4  * netup-eeprom.c
   5  *
   6  * 24LC02 EEPROM driver in conjunction with NetUP Dual DVB-S2 CI card
   7  *
   8  * Copyright (C) 2009 NetUP Inc.
   9  * Copyright (C) 2009 Abylay Ospan <aospan@netup.ru>
  10  */
  11
  12 #
  13 #include "cx23885.h"
  14 #include "netup-eeprom.h"
  15
  16 #define EEPROM_I2C_ADDR 0x50
  17
  18 int netup_eeprom_read(struct i2c_adapter *i2c_adap, u8 addr)
  19 {
  20         int ret;
  21         unsigned char buf[2];
  22
  23         /* Read from EEPROM */
  24         struct i2c_msg msg[] = {
  25                 {
  26                         .addr   = EEPROM_I2C_ADDR,
  27                         .flags  = 0,
  28                         .buf    = &buf[0],
  29                         .len    = 1
  30                 }, {
  31                         .addr   = EEPROM_I2C_ADDR,
  32                         .flags  = I2C_M_RD,
  33                         .buf    = &buf[1],
  34                         .len    = 1
  35                 }
  36
  37         };
  38
  39         buf[0] = addr;
  40         buf[1] = 0x0;
  41
  42         ret = i2c_transfer(i2c_adap, msg, 2);
  43
  44         if (ret != 2) {
  45                 pr_err("eeprom i2c read error, status=%d\n", ret);
  46                 return -1;
  47         }
  48
  49         return buf[1];
  50 };
  51
  52 int netup_eeprom_write(struct i2c_adapter *i2c_adap, u8 addr, u8 data)
  53 {
  54         int ret;
  55         unsigned char bufw[2];
  56
  57         /* Write into EEPROM */
  58         struct i2c_msg msg[] = {
  59                 {
  60                         .addr   = EEPROM_I2C_ADDR,
  61                         .flags  = 0,
  62                         .buf    = &bufw[0],
  63                         .len    = 2
  64                 }
  65         };
  66
  67         bufw[0] = addr;
  68         bufw[1] = data;
  69
  70         ret = i2c_transfer(i2c_adap, msg, 1);
  71
  72         if (ret != 1) {
  73                 pr_err("eeprom i2c write error, status=%d\n", ret);
  74                 return -1;
  75         }
  76
  77         mdelay(10); /* prophylactic delay, datasheet write cycle time = 5 ms */
  78         return 0;
  79 };
  80
  81 void netup_get_card_info(struct i2c_adapter *i2c_adap,
  82                                 struct netup_card_info *cinfo)
  83 {
  84         int i, j;
  85
  86         cinfo->rev =  netup_eeprom_read(i2c_adap, 63);
  87
  88         for (i = 64, j = 0; i < 70; i++, j++)
  89                 cinfo->port[0].mac[j] =  netup_eeprom_read(i2c_adap, i);
  90
  91         for (i = 70, j = 0; i < 76; i++, j++)
  92                 cinfo->port[1].mac[j] =  netup_eeprom_read(i2c_adap, i);
  93 };