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
calc_lrc(u8 * buf,int len)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
flexcop_eeprom_request(struct flexcop_device * fc,flexcop_access_op_t op,u16 addr,u8 * buf,u16 len,int retries)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 ret = fc->i2c_request(&fc->fc_i2c_adap[1], op, chipaddr,
119 addr & 0xff, buf, len);
120 if (ret == 0)
121 break;
122 }
123 return ret;
124 }
125
flexcop_eeprom_lrc_read(struct flexcop_device * fc,u16 addr,u8 * buf,u16 len,int retries)126 static int flexcop_eeprom_lrc_read(struct flexcop_device *fc, u16 addr, u8 *buf, u16 len, int retries)
127 {
128 int ret = flexcop_eeprom_request(fc, FC_READ, addr, buf, len, retries);
129 if (ret == 0)
130 if (calc_lrc(buf, len - 1) != buf[len - 1])
131 ret = -EINVAL;
132 return ret;
133 }
134
135 /* JJ's comment about extended == 1: it is not presently used anywhere but was
136 * added to the low-level functions for possible support of EUI64
137 */
flexcop_eeprom_check_mac_addr(struct flexcop_device * fc,int extended)138 int flexcop_eeprom_check_mac_addr(struct flexcop_device *fc, int extended)
139 {
140 u8 buf[8];
141 int ret = 0;
142
143 if ((ret = flexcop_eeprom_lrc_read(fc,0x3f8,buf,8,4)) == 0) {
144 if (extended != 0) {
145 err("TODO: extended (EUI64) MAC addresses aren't completely supported yet");
146 ret = -EINVAL;
147 /* memcpy(fc->dvb_adapter.proposed_mac,buf,3);
148 mac[3] = 0xfe;
149 mac[4] = 0xff;
150 memcpy(&fc->dvb_adapter.proposed_mac[3],&buf[5],3); */
151 } else
152 memcpy(fc->dvb_adapter.proposed_mac,buf,6);
153 }
154 return ret;
155 }
156 EXPORT_SYMBOL(flexcop_eeprom_check_mac_addr);
157