drivers/media/dvb/b2c2/flexcop-eeprom.c

   1 /*
   2  * This file is part of linux driver the digital TV devices equipped with B2C2 FlexcopII(b)/III
   3  *
   4  * flexcop-eeprom.c - eeprom access methods (currently only MAC address reading is used)
   5  *
   6  * see flexcop.c for copyright information.
   7  */
   8 #include "flexcop.h"
   9
  10 #if 0
  11 /*EEPROM (Skystar2 has one "24LC08B" chip on board) */
  12 static int eeprom_write(struct adapter *adapter, u16 addr, u8 *buf, u16 len)
  13 {
  14         return flex_i2c_write(adapter, 0x20000000, 0x50, addr, buf, len);
  15 }
  16
  17 static int eeprom_lrc_write(struct adapter *adapter, u32 addr, u32 len, u8 *wbuf, u8 *rbuf, int retries)
  18 {
  19         int i;
  20
  21         for (i = 0; i < retries; i++) {
  22                 if (eeprom_write(adapter, addr, wbuf, len) == len) {
  23                         if (eeprom_lrc_read(adapter, addr, len, rbuf, retries) == 1)
  24                                 return 1;
  25                 }
  26         }
  27
  28         return 0;
  29 }
  30
  31 /* These functions could be used to unlock SkyStar2 cards. */
  32
  33 static int eeprom_writeKey(struct adapter *adapter, u8 *key, u32 len)
  34 {
  35         u8 rbuf[20];
  36         u8 wbuf[20];
  37
  38         if (len != 16)
  39                 return 0;
  40
  41         memcpy(wbuf, key, len);
  42
  43         wbuf[16] = 0;
  44         wbuf[17] = 0;
  45         wbuf[18] = 0;
  46         wbuf[19] = calc_lrc(wbuf, 19);
  47
  48         return eeprom_lrc_write(adapter, 0x3e4, 20, wbuf, rbuf, 4);
  49 }
  50
  51 static int eeprom_readKey(struct adapter *adapter, u8 *key, u32 len)
  52 {
  53         u8 buf[20];
  54
  55         if (len != 16)
  56                 return 0;
  57
  58         if (eeprom_lrc_read(adapter, 0x3e4, 20, buf, 4) == 0)
  59                 return 0;
  60
  61         memcpy(key, buf, len);
  62
  63         return 1;
  64 }
  65
  66 static char eeprom_set_mac_addr(struct adapter *adapter, char type, u8 *mac)
  67 {
  68         u8 tmp[8];
  69
  70         if (type != 0) {
  71                 tmp[0] = mac[0];
  72                 tmp[1] = mac[1];
  73                 tmp[2] = mac[2];
  74                 tmp[3] = mac[5];
  75                 tmp[4] = mac[6];
  76                 tmp[5] = mac[7];
  77
  78         } else {
  79
  80                 tmp[0] = mac[0];
  81                 tmp[1] = mac[1];
  82                 tmp[2] = mac[2];
  83                 tmp[3] = mac[3];
  84                 tmp[4] = mac[4];
  85                 tmp[5] = mac[5];
  86         }
  87
  88         tmp[6] = 0;
  89         tmp[7] = calc_lrc(tmp, 7);
  90
  91         if (eeprom_write(adapter, 0x3f8, tmp, 8) == 8)
  92                 return 1;
  93
  94         return 0;
  95 }
  96
  97 static int flexcop_eeprom_read(struct flexcop_device *fc, u16 addr, u8 *buf, u16 len)
  98 {
  99         return fc->i2c_request(fc,FC_READ,FC_I2C_PORT_EEPROM,0x50,addr,buf,len);
 100 }
 101
 102 #endif
 103
 104 static u8 calc_lrc(u8 *buf, int len)
 105 {
 106         int i;
 107         u8 sum = 0;
 108         for (i = 0; i < len; i++)
 109                 sum = sum ^ buf[i];
 110         return sum;
 111 }
 112
 113 static int flexcop_eeprom_request(struct flexcop_device *fc, flexcop_access_op_t op, u16 addr, u8 *buf, u16 len, int retries)
 114 {
 115         int i,ret = 0;
 116         u8 chipaddr =  0x50 | ((addr >> 8) & 3);
 117         for (i = 0; i < retries; i++)
 118                 if ((ret = fc->i2c_request(fc,op,FC_I2C_PORT_EEPROM,chipaddr,addr & 0xff,buf,len)) == 0)
 119                         break;
 120         return ret;
 121 }
 122
 123 static int flexcop_eeprom_lrc_read(struct flexcop_device *fc, u16 addr, u8 *buf, u16 len, int retries)
 124 {
 125         int ret = flexcop_eeprom_request(fc,FC_READ,addr,buf,len,retries);
 126         if (ret == 0)
 127                 if (calc_lrc(buf, len - 1) != buf[len - 1])
 128                         ret = -EINVAL;
 129         return ret;
 130 }
 131
 132 /* JJ's comment about extended == 1: it is not presently used anywhere but was
 133  * added to the low-level functions for possible support of EUI64
 134  */
 135 int flexcop_eeprom_check_mac_addr(struct flexcop_device *fc, int extended)
 136 {
 137         u8 buf[8];
 138         int ret = 0;
 139
 140         if ((ret = flexcop_eeprom_lrc_read(fc,0x3f8,buf,8,4)) == 0) {
 141                 if (extended != 0) {
 142                         err("TODO: extended (EUI64) MAC addresses aren't completely supported yet");
 143                         ret = -EINVAL;
 144 /*                      memcpy(fc->dvb_adapter.proposed_mac,buf,3);
 145                         mac[3] = 0xfe;
 146                         mac[4] = 0xff;
 147                         memcpy(&fc->dvb_adapter.proposed_mac[3],&buf[5],3); */
 148                 } else
 149                         memcpy(fc->dvb_adapter.proposed_mac,buf,6);
 150         }
 151         return ret;
 152 }
 153 EXPORT_SYMBOL(flexcop_eeprom_check_mac_addr);