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flexcop-eeprom.c

/*
 * This file is part of linux driver the digital TV devices equipped with B2C2 FlexcopII(b)/III
 *
 * flexcop-eeprom.c - eeprom access methods (currently only MAC address reading is used)
 *
 * see flexcop.c for copyright information.
 */
#include "flexcop.h"

#if 0
/*EEPROM (Skystar2 has one "24LC08B" chip on board) */
static int eeprom_write(struct adapter *adapter, u16 addr, u8 *buf, u16 len)
{
      return flex_i2c_write(adapter, 0x20000000, 0x50, addr, buf, len);
}

static int eeprom_lrc_write(struct adapter *adapter, u32 addr, u32 len, u8 *wbuf, u8 *rbuf, int retries)
{
      int i;

      for (i = 0; i < retries; i++) {
            if (eeprom_write(adapter, addr, wbuf, len) == len) {
                  if (eeprom_lrc_read(adapter, addr, len, rbuf, retries) == 1)
                        return 1;
            }
      }

      return 0;
}

/* These functions could be used to unlock SkyStar2 cards. */

static int eeprom_writeKey(struct adapter *adapter, u8 *key, u32 len)
{
      u8 rbuf[20];
      u8 wbuf[20];

      if (len != 16)
            return 0;

      memcpy(wbuf, key, len);

      wbuf[16] = 0;
      wbuf[17] = 0;
      wbuf[18] = 0;
      wbuf[19] = calc_lrc(wbuf, 19);

      return eeprom_lrc_write(adapter, 0x3e4, 20, wbuf, rbuf, 4);
}

static int eeprom_readKey(struct adapter *adapter, u8 *key, u32 len)
{
      u8 buf[20];

      if (len != 16)
            return 0;

      if (eeprom_lrc_read(adapter, 0x3e4, 20, buf, 4) == 0)
            return 0;

      memcpy(key, buf, len);

      return 1;
}

static char eeprom_set_mac_addr(struct adapter *adapter, char type, u8 *mac)
{
      u8 tmp[8];

      if (type != 0) {
            tmp[0] = mac[0];
            tmp[1] = mac[1];
            tmp[2] = mac[2];
            tmp[3] = mac[5];
            tmp[4] = mac[6];
            tmp[5] = mac[7];

      } else {

            tmp[0] = mac[0];
            tmp[1] = mac[1];
            tmp[2] = mac[2];
            tmp[3] = mac[3];
            tmp[4] = mac[4];
            tmp[5] = mac[5];
      }

      tmp[6] = 0;
      tmp[7] = calc_lrc(tmp, 7);

      if (eeprom_write(adapter, 0x3f8, tmp, 8) == 8)
            return 1;

      return 0;
}

static int flexcop_eeprom_read(struct flexcop_device *fc, u16 addr, u8 *buf, u16 len)
{
      return fc->i2c_request(fc,FC_READ,FC_I2C_PORT_EEPROM,0x50,addr,buf,len);
}

#endif

static u8 calc_lrc(u8 *buf, int len)
{
      int i;
      u8 sum = 0;
      for (i = 0; i < len; i++)
            sum = sum ^ buf[i];
      return sum;
}

static int flexcop_eeprom_request(struct flexcop_device *fc, flexcop_access_op_t op, u16 addr, u8 *buf, u16 len, int retries)
{
      int i,ret = 0;
      u8 chipaddr =  0x50 | ((addr >> 8) & 3);
      for (i = 0; i < retries; i++)
            if ((ret = fc->i2c_request(fc,op,FC_I2C_PORT_EEPROM,chipaddr,addr & 0xff,buf,len)) == 0)
                  break;
      return ret;
}

static int flexcop_eeprom_lrc_read(struct flexcop_device *fc, u16 addr, u8 *buf, u16 len, int retries)
{
      int ret = flexcop_eeprom_request(fc,FC_READ,addr,buf,len,retries);
      if (ret == 0)
            if (calc_lrc(buf, len - 1) != buf[len - 1])
                  ret = -EINVAL;
      return ret;
}

/* JJ's comment about extended == 1: it is not presently used anywhere but was
 * added to the low-level functions for possible support of EUI64
 */
int flexcop_eeprom_check_mac_addr(struct flexcop_device *fc, int extended)
{
      u8 buf[8];
      int ret = 0;

      if ((ret = flexcop_eeprom_lrc_read(fc,0x3f8,buf,8,4)) == 0) {
            if (extended != 0) {
                  err("TODO: extended (EUI64) MAC addresses aren't completely supported yet");
                  ret = -EINVAL;
/*                memcpy(fc->dvb_adapter.proposed_mac,buf,3);
                  mac[3] = 0xfe;
                  mac[4] = 0xff;
                  memcpy(&fc->dvb_adapter.proposed_mac[3],&buf[5],3); */
            } else
                  memcpy(fc->dvb_adapter.proposed_mac,buf,6);
      }
      return ret;
}
EXPORT_SYMBOL(flexcop_eeprom_check_mac_addr);

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