tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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) */
12static 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
17static 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
33static 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
51static 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
66static 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
97static 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
104static 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
113static 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 if ((ret = fc->i2c_request(fc,op,FC_I2C_PORT_EEPROM,chipaddr,addr & 0xff,buf,len)) == 0)
119 break;
120 return ret;
121}
122
123static int flexcop_eeprom_lrc_read(struct flexcop_device *fc, u16 addr, u8 *buf, u16 len, int retries)
124{
125 int ret = flexcop_eeprom_request(fc,FC_READ,addr,buf,len,retries);
126 if (ret == 0)
127 if (calc_lrc(buf, len - 1) != buf[len - 1])
128 ret = -EINVAL;
129 return ret;
130}
131
132/* JJ's comment about extended == 1: it is not presently used anywhere but was
133 * added to the low-level functions for possible support of EUI64
134 */
135int flexcop_eeprom_check_mac_addr(struct flexcop_device *fc, int extended)
136{
137 u8 buf[8];
138 int ret = 0;
139
140 if ((ret = flexcop_eeprom_lrc_read(fc,0x3f8,buf,8,4)) == 0) {
141 if (extended != 0) {
142 err("TODO: extended (EUI64) MAC addresses aren't completely supported yet");
143 ret = -EINVAL;
144/* memcpy(fc->dvb_adapter.proposed_mac,buf,3);
145 mac[3] = 0xfe;
146 mac[4] = 0xff;
147 memcpy(&fc->dvb_adapter.proposed_mac[3],&buf[5],3); */
148 } else
149 memcpy(fc->dvb_adapter.proposed_mac,buf,6);
150 }
151 return ret;
152}
153EXPORT_SYMBOL(flexcop_eeprom_check_mac_addr);