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, 63);
101 
102 	for (i = 64, j = 0; i < 70; i++, j++)
103 		cinfo->port[0].mac[j] =  netup_eeprom_read(i2c_adap, i);
104 
105 	for (i = 70, j = 0; i < 76; i++, j++)
106 		cinfo->port[1].mac[j] =  netup_eeprom_read(i2c_adap, i);
107 };
108