Merge branch 'linus' into core/softlockup
[linux-2.6] / drivers / media / video / cx23885 / netup-eeprom.c
1
2 /*
3  * netup-eeprom.c
4  *
5  * 24LC02 EEPROM driver in conjunction with NetUP Dual DVB-S2 CI card
6  *
7  * Copyright (C) 2009 NetUP Inc.
8  * Copyright (C) 2009 Abylay Ospan <aospan@netup.ru>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  *
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  */
25
26 #
27 #include "cx23885.h"
28 #include "netup-eeprom.h"
29
30 #define EEPROM_I2C_ADDR 0x50
31
32 int netup_eeprom_read(struct i2c_adapter *i2c_adap, u8 addr)
33 {
34         int ret;
35         unsigned char buf[2];
36
37         /* Read from EEPROM */
38         struct i2c_msg msg[] = {
39                 {
40                         .addr   = EEPROM_I2C_ADDR,
41                         .flags  = 0,
42                         .buf    = &buf[0],
43                         .len    = 1
44                 }, {
45                         .addr   = EEPROM_I2C_ADDR,
46                         .flags  = I2C_M_RD,
47                         .buf    = &buf[1],
48                         .len    = 1
49                 }
50
51         };
52
53         buf[0] = addr;
54         buf[1] = 0x0;
55
56         ret = i2c_transfer(i2c_adap, msg, 2);
57
58         if (ret != 2) {
59                 printk(KERN_ERR "eeprom i2c read error, status=%d\n", ret);
60                 return -1;
61         }
62
63         return buf[1];
64 };
65
66 int netup_eeprom_write(struct i2c_adapter *i2c_adap, u8 addr, u8 data)
67 {
68         int ret;
69         unsigned char bufw[2];
70
71         /* Write into EEPROM */
72         struct i2c_msg msg[] = {
73                 {
74                         .addr   = EEPROM_I2C_ADDR,
75                         .flags  = 0,
76                         .buf    = &bufw[0],
77                         .len    = 2
78                 }
79         };
80
81         bufw[0] = addr;
82         bufw[1] = data;
83
84         ret = i2c_transfer(i2c_adap, msg, 1);
85
86         if (ret != 1) {
87                 printk(KERN_ERR "eeprom i2c write error, status=%d\n", ret);
88                 return -1;
89         }
90
91         mdelay(10); /* prophylactic delay, datasheet write cycle time = 5 ms */
92         return 0;
93 };
94
95 void netup_get_card_info(struct i2c_adapter *i2c_adap,
96                                 struct netup_card_info *cinfo)
97 {
98         int i, j;
99
100         cinfo->rev =  netup_eeprom_read(i2c_adap, 13);
101
102         for (i = 0, j = 0; i < 6; i++, j++)
103                 cinfo->port[0].mac[j] =  netup_eeprom_read(i2c_adap, i);
104
105         for (i = 6, j = 0; i < 12; i++, j++)
106                 cinfo->port[1].mac[j] =  netup_eeprom_read(i2c_adap, i);
107 };