148 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III4 * flexcop-eeprom.c - eeprom access methods (currently only MAC address reading)5 * see flexcop.c for copyright information6 */7#include "flexcop.h"8 9#if 010/*EEPROM (Skystar2 has one "24LC08B" chip on board) */11static int eeprom_write(struct adapter *adapter, u16 addr, u8 *buf, u16 len)12{13 return flex_i2c_write(adapter, 0x20000000, 0x50, addr, buf, len);14}15 16static int eeprom_lrc_write(struct adapter *adapter, u32 addr,17 u32 len, u8 *wbuf, u8 *rbuf, int retries)18{19int i;20 21for (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 return 0;28}29 30/* These functions could be used to unlock SkyStar2 cards. */31 32static int eeprom_writeKey(struct adapter *adapter, u8 *key, u32 len)33{34 u8 rbuf[20];35 u8 wbuf[20];36 37 if (len != 16)38 return 0;39 40 memcpy(wbuf, key, len);41 wbuf[16] = 0;42 wbuf[17] = 0;43 wbuf[18] = 0;44 wbuf[19] = calc_lrc(wbuf, 19);45 return eeprom_lrc_write(adapter, 0x3e4, 20, wbuf, rbuf, 4);46}47 48static int eeprom_readKey(struct adapter *adapter, u8 *key, u32 len)49{50 u8 buf[20];51 52 if (len != 16)53 return 0;54 55 if (eeprom_lrc_read(adapter, 0x3e4, 20, buf, 4) == 0)56 return 0;57 58 memcpy(key, buf, len);59 return 1;60}61 62static char eeprom_set_mac_addr(struct adapter *adapter, char type, u8 *mac)63{64 u8 tmp[8];65 66 if (type != 0) {67 tmp[0] = mac[0];68 tmp[1] = mac[1];69 tmp[2] = mac[2];70 tmp[3] = mac[5];71 tmp[4] = mac[6];72 tmp[5] = mac[7];73 } else {74 tmp[0] = mac[0];75 tmp[1] = mac[1];76 tmp[2] = mac[2];77 tmp[3] = mac[3];78 tmp[4] = mac[4];79 tmp[5] = mac[5];80 }81 82 tmp[6] = 0;83 tmp[7] = calc_lrc(tmp, 7);84 85 if (eeprom_write(adapter, 0x3f8, tmp, 8) == 8)86 return 1;87 return 0;88}89 90static int flexcop_eeprom_read(struct flexcop_device *fc,91 u16 addr, u8 *buf, u16 len)92{93 return fc->i2c_request(fc,FC_READ,FC_I2C_PORT_EEPROM,0x50,addr,buf,len);94}95 96#endif97 98static u8 calc_lrc(u8 *buf, int len)99{100 int i;101 u8 sum = 0;102 for (i = 0; i < len; i++)103 sum = sum ^ buf[i];104 return sum;105}106 107static int flexcop_eeprom_request(struct flexcop_device *fc,108 flexcop_access_op_t op, u16 addr, u8 *buf, u16 len, int retries)109{110 int i,ret = 0;111 u8 chipaddr = 0x50 | ((addr >> 8) & 3);112 for (i = 0; i < retries; i++) {113 ret = fc->i2c_request(&fc->fc_i2c_adap[1], op, chipaddr,114 addr & 0xff, buf, len);115 if (ret == 0)116 break;117 }118 return ret;119}120 121static int flexcop_eeprom_lrc_read(struct flexcop_device *fc, u16 addr,122 u8 *buf, u16 len, int retries)123{124 int ret = flexcop_eeprom_request(fc, FC_READ, addr, buf, len, retries);125 if (ret == 0)126 if (calc_lrc(buf, len - 1) != buf[len - 1])127 ret = -EINVAL;128 return ret;129}130 131/* JJ's comment about extended == 1: it is not presently used anywhere but was132 * added to the low-level functions for possible support of EUI64 */133int flexcop_eeprom_check_mac_addr(struct flexcop_device *fc, int extended)134{135 u8 buf[8];136 int ret = 0;137 138 if ((ret = flexcop_eeprom_lrc_read(fc,0x3f8,buf,8,4)) == 0) {139 if (extended != 0) {140 err("TODO: extended (EUI64) MAC addresses aren't completely supported yet");141 ret = -EINVAL;142 } else143 memcpy(fc->dvb_adapter.proposed_mac,buf,6);144 }145 return ret;146}147EXPORT_SYMBOL(flexcop_eeprom_check_mac_addr);148