2 * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III
3 * flexcop-eeprom.c - eeprom access methods (currently only MAC address reading)
4 * see flexcop.c for copyright information
9 /*EEPROM (Skystar2 has one "24LC08B" chip on board) */
10 static int eeprom_write(struct adapter *adapter, u16 addr, u8 *buf, u16 len)
12 return flex_i2c_write(adapter, 0x20000000, 0x50, addr, buf, len);
15 static int eeprom_lrc_write(struct adapter *adapter, u32 addr,
16 u32 len, u8 *wbuf, u8 *rbuf, int retries)
20 for (i = 0; i < retries; i++) {
21 if (eeprom_write(adapter, addr, wbuf, len) == len) {
22 if (eeprom_lrc_read(adapter, addr, len, rbuf, retries) == 1)
29 /* These functions could be used to unlock SkyStar2 cards. */
31 static int eeprom_writeKey(struct adapter *adapter, u8 *key, u32 len)
39 memcpy(wbuf, key, len);
43 wbuf[19] = calc_lrc(wbuf, 19);
44 return eeprom_lrc_write(adapter, 0x3e4, 20, wbuf, rbuf, 4);
47 static int eeprom_readKey(struct adapter *adapter, u8 *key, u32 len)
54 if (eeprom_lrc_read(adapter, 0x3e4, 20, buf, 4) == 0)
57 memcpy(key, buf, len);
61 static char eeprom_set_mac_addr(struct adapter *adapter, char type, u8 *mac)
82 tmp[7] = calc_lrc(tmp, 7);
84 if (eeprom_write(adapter, 0x3f8, tmp, 8) == 8)
89 static int flexcop_eeprom_read(struct flexcop_device *fc,
90 u16 addr, u8 *buf, u16 len)
92 return fc->i2c_request(fc,FC_READ,FC_I2C_PORT_EEPROM,0x50,addr,buf,len);
97 static u8 calc_lrc(u8 *buf, int len)
101 for (i = 0; i < len; i++)
106 static int flexcop_eeprom_request(struct flexcop_device *fc,
107 flexcop_access_op_t op, u16 addr, u8 *buf, u16 len, int retries)
110 u8 chipaddr = 0x50 | ((addr >> 8) & 3);
111 for (i = 0; i < retries; i++) {
112 ret = fc->i2c_request(&fc->fc_i2c_adap[1], op, chipaddr,
113 addr & 0xff, buf, len);
120 static int flexcop_eeprom_lrc_read(struct flexcop_device *fc, u16 addr,
121 u8 *buf, u16 len, int retries)
123 int ret = flexcop_eeprom_request(fc, FC_READ, addr, buf, len, retries);
125 if (calc_lrc(buf, len - 1) != buf[len - 1])
130 /* JJ's comment about extended == 1: it is not presently used anywhere but was
131 * added to the low-level functions for possible support of EUI64 */
132 int flexcop_eeprom_check_mac_addr(struct flexcop_device *fc, int extended)
137 if ((ret = flexcop_eeprom_lrc_read(fc,0x3f8,buf,8,4)) == 0) {
139 err("TODO: extended (EUI64) MAC addresses aren't "
140 "completely supported yet");
143 memcpy(fc->dvb_adapter.proposed_mac,buf,6);
147 EXPORT_SYMBOL(flexcop_eeprom_check_mac_addr);