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 
22 #
23 #include "cx23885.h"
24 #include "netup-eeprom.h"
25 
26 #define EEPROM_I2C_ADDR 0x50
27 
28 int netup_eeprom_read(struct i2c_adapter *i2c_adap, u8 addr)
29 {
30 	int ret;
31 	unsigned char buf[2];
32 
33 	/* Read from EEPROM */
34 	struct i2c_msg msg[] = {
35 		{
36 			.addr	= EEPROM_I2C_ADDR,
37 			.flags	= 0,
38 			.buf	= &buf[0],
39 			.len	= 1
40 		}, {
41 			.addr	= EEPROM_I2C_ADDR,
42 			.flags	= I2C_M_RD,
43 			.buf	= &buf[1],
44 			.len	= 1
45 		}
46 
47 	};
48 
49 	buf[0] = addr;
50 	buf[1] = 0x0;
51 
52 	ret = i2c_transfer(i2c_adap, msg, 2);
53 
54 	if (ret != 2) {
55 		printk(KERN_ERR "eeprom i2c read error, status=%d\n", ret);
56 		return -1;
57 	}
58 
59 	return buf[1];
60 };
61 
62 int netup_eeprom_write(struct i2c_adapter *i2c_adap, u8 addr, u8 data)
63 {
64 	int ret;
65 	unsigned char bufw[2];
66 
67 	/* Write into EEPROM */
68 	struct i2c_msg msg[] = {
69 		{
70 			.addr	= EEPROM_I2C_ADDR,
71 			.flags	= 0,
72 			.buf	= &bufw[0],
73 			.len	= 2
74 		}
75 	};
76 
77 	bufw[0] = addr;
78 	bufw[1] = data;
79 
80 	ret = i2c_transfer(i2c_adap, msg, 1);
81 
82 	if (ret != 1) {
83 		printk(KERN_ERR "eeprom i2c write error, status=%d\n", ret);
84 		return -1;
85 	}
86 
87 	mdelay(10); /* prophylactic delay, datasheet write cycle time = 5 ms */
88 	return 0;
89 };
90 
91 void netup_get_card_info(struct i2c_adapter *i2c_adap,
92 				struct netup_card_info *cinfo)
93 {
94 	int i, j;
95 
96 	cinfo->rev =  netup_eeprom_read(i2c_adap, 63);
97 
98 	for (i = 64, j = 0; i < 70; i++, j++)
99 		cinfo->port[0].mac[j] =  netup_eeprom_read(i2c_adap, i);
100 
101 	for (i = 70, j = 0; i < 76; i++, j++)
102 		cinfo->port[1].mac[j] =  netup_eeprom_read(i2c_adap, i);
103 };
104