148 lines
3.2 KiB
C
148 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III
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* flexcop-eeprom.c - eeprom access methods (currently only MAC address reading)
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* see flexcop.c for copyright information
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*/
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#include "flexcop.h"
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#if 0
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/*EEPROM (Skystar2 has one "24LC08B" chip on board) */
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static int eeprom_write(struct adapter *adapter, u16 addr, u8 *buf, u16 len)
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{
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return flex_i2c_write(adapter, 0x20000000, 0x50, addr, buf, len);
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}
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static int eeprom_lrc_write(struct adapter *adapter, u32 addr,
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u32 len, u8 *wbuf, u8 *rbuf, int retries)
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{
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int i;
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for (i = 0; i < retries; i++) {
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if (eeprom_write(adapter, addr, wbuf, len) == len) {
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if (eeprom_lrc_read(adapter, addr, len, rbuf, retries) == 1)
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return 1;
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}
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}
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return 0;
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}
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/* These functions could be used to unlock SkyStar2 cards. */
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static int eeprom_writeKey(struct adapter *adapter, u8 *key, u32 len)
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{
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u8 rbuf[20];
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u8 wbuf[20];
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if (len != 16)
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return 0;
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memcpy(wbuf, key, len);
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wbuf[16] = 0;
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wbuf[17] = 0;
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wbuf[18] = 0;
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wbuf[19] = calc_lrc(wbuf, 19);
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return eeprom_lrc_write(adapter, 0x3e4, 20, wbuf, rbuf, 4);
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}
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static int eeprom_readKey(struct adapter *adapter, u8 *key, u32 len)
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{
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u8 buf[20];
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if (len != 16)
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return 0;
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if (eeprom_lrc_read(adapter, 0x3e4, 20, buf, 4) == 0)
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return 0;
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memcpy(key, buf, len);
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return 1;
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}
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static char eeprom_set_mac_addr(struct adapter *adapter, char type, u8 *mac)
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{
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u8 tmp[8];
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if (type != 0) {
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tmp[0] = mac[0];
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tmp[1] = mac[1];
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tmp[2] = mac[2];
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tmp[3] = mac[5];
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tmp[4] = mac[6];
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tmp[5] = mac[7];
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} else {
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tmp[0] = mac[0];
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tmp[1] = mac[1];
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tmp[2] = mac[2];
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tmp[3] = mac[3];
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tmp[4] = mac[4];
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tmp[5] = mac[5];
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}
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tmp[6] = 0;
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tmp[7] = calc_lrc(tmp, 7);
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if (eeprom_write(adapter, 0x3f8, tmp, 8) == 8)
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return 1;
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return 0;
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}
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static int flexcop_eeprom_read(struct flexcop_device *fc,
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u16 addr, u8 *buf, u16 len)
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{
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return fc->i2c_request(fc,FC_READ,FC_I2C_PORT_EEPROM,0x50,addr,buf,len);
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}
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#endif
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static u8 calc_lrc(u8 *buf, int len)
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{
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int i;
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u8 sum = 0;
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for (i = 0; i < len; i++)
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sum = sum ^ buf[i];
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return sum;
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}
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static int flexcop_eeprom_request(struct flexcop_device *fc,
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flexcop_access_op_t op, u16 addr, u8 *buf, u16 len, int retries)
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{
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int i,ret = 0;
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u8 chipaddr = 0x50 | ((addr >> 8) & 3);
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for (i = 0; i < retries; i++) {
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ret = fc->i2c_request(&fc->fc_i2c_adap[1], op, chipaddr,
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addr & 0xff, buf, len);
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if (ret == 0)
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break;
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}
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return ret;
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}
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static int flexcop_eeprom_lrc_read(struct flexcop_device *fc, u16 addr,
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u8 *buf, u16 len, int retries)
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{
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int ret = flexcop_eeprom_request(fc, FC_READ, addr, buf, len, retries);
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if (ret == 0)
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if (calc_lrc(buf, len - 1) != buf[len - 1])
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ret = -EINVAL;
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return ret;
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}
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/* JJ's comment about extended == 1: it is not presently used anywhere but was
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* added to the low-level functions for possible support of EUI64 */
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int flexcop_eeprom_check_mac_addr(struct flexcop_device *fc, int extended)
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{
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u8 buf[8];
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int ret = 0;
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if ((ret = flexcop_eeprom_lrc_read(fc,0x3f8,buf,8,4)) == 0) {
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if (extended != 0) {
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err("TODO: extended (EUI64) MAC addresses aren't completely supported yet");
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ret = -EINVAL;
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} else
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memcpy(fc->dvb_adapter.proposed_mac,buf,6);
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}
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return ret;
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}
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EXPORT_SYMBOL(flexcop_eeprom_check_mac_addr);
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