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[linux/fpc-iii.git] / drivers / media / common / b2c2 / flexcop-eeprom.c
bloba25373a9bd8480b48077f0acd8d43961cc0ab969
1 /*
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
5 */
6 #include "flexcop.h"
8 #if 0
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)
18 int i;
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)
23 return 1;
26 return 0;
29 /* These functions could be used to unlock SkyStar2 cards. */
31 static int eeprom_writeKey(struct adapter *adapter, u8 *key, u32 len)
33 u8 rbuf[20];
34 u8 wbuf[20];
36 if (len != 16)
37 return 0;
39 memcpy(wbuf, key, len);
40 wbuf[16] = 0;
41 wbuf[17] = 0;
42 wbuf[18] = 0;
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)
49 u8 buf[20];
51 if (len != 16)
52 return 0;
54 if (eeprom_lrc_read(adapter, 0x3e4, 20, buf, 4) == 0)
55 return 0;
57 memcpy(key, buf, len);
58 return 1;
61 static char eeprom_set_mac_addr(struct adapter *adapter, char type, u8 *mac)
63 u8 tmp[8];
65 if (type != 0) {
66 tmp[0] = mac[0];
67 tmp[1] = mac[1];
68 tmp[2] = mac[2];
69 tmp[3] = mac[5];
70 tmp[4] = mac[6];
71 tmp[5] = mac[7];
72 } else {
73 tmp[0] = mac[0];
74 tmp[1] = mac[1];
75 tmp[2] = mac[2];
76 tmp[3] = mac[3];
77 tmp[4] = mac[4];
78 tmp[5] = mac[5];
81 tmp[6] = 0;
82 tmp[7] = calc_lrc(tmp, 7);
84 if (eeprom_write(adapter, 0x3f8, tmp, 8) == 8)
85 return 1;
86 return 0;
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);
95 #endif
97 static u8 calc_lrc(u8 *buf, int len)
99 int i;
100 u8 sum = 0;
101 for (i = 0; i < len; i++)
102 sum = sum ^ buf[i];
103 return sum;
106 static int flexcop_eeprom_request(struct flexcop_device *fc,
107 flexcop_access_op_t op, u16 addr, u8 *buf, u16 len, int retries)
109 int i,ret = 0;
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);
114 if (ret == 0)
115 break;
117 return ret;
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);
124 if (ret == 0)
125 if (calc_lrc(buf, len - 1) != buf[len - 1])
126 ret = -EINVAL;
127 return ret;
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)
134 u8 buf[8];
135 int ret = 0;
137 if ((ret = flexcop_eeprom_lrc_read(fc,0x3f8,buf,8,4)) == 0) {
138 if (extended != 0) {
139 err("TODO: extended (EUI64) MAC addresses aren't "
140 "completely supported yet");
141 ret = -EINVAL;
142 } else
143 memcpy(fc->dvb_adapter.proposed_mac,buf,6);
145 return ret;
147 EXPORT_SYMBOL(flexcop_eeprom_check_mac_addr);