treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
[sfrench/cifs-2.6.git] / drivers / media / pci / cx23885 / netup-eeprom.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2
3 /*
4  * netup-eeprom.c
5  *
6  * 24LC02 EEPROM driver in conjunction with NetUP Dual DVB-S2 CI card
7  *
8  * Copyright (C) 2009 NetUP Inc.
9  * Copyright (C) 2009 Abylay Ospan <aospan@netup.ru>
10  */
11
12 #
13 #include "cx23885.h"
14 #include "netup-eeprom.h"
15
16 #define EEPROM_I2C_ADDR 0x50
17
18 int netup_eeprom_read(struct i2c_adapter *i2c_adap, u8 addr)
19 {
20         int ret;
21         unsigned char buf[2];
22
23         /* Read from EEPROM */
24         struct i2c_msg msg[] = {
25                 {
26                         .addr   = EEPROM_I2C_ADDR,
27                         .flags  = 0,
28                         .buf    = &buf[0],
29                         .len    = 1
30                 }, {
31                         .addr   = EEPROM_I2C_ADDR,
32                         .flags  = I2C_M_RD,
33                         .buf    = &buf[1],
34                         .len    = 1
35                 }
36
37         };
38
39         buf[0] = addr;
40         buf[1] = 0x0;
41
42         ret = i2c_transfer(i2c_adap, msg, 2);
43
44         if (ret != 2) {
45                 pr_err("eeprom i2c read error, status=%d\n", ret);
46                 return -1;
47         }
48
49         return buf[1];
50 };
51
52 int netup_eeprom_write(struct i2c_adapter *i2c_adap, u8 addr, u8 data)
53 {
54         int ret;
55         unsigned char bufw[2];
56
57         /* Write into EEPROM */
58         struct i2c_msg msg[] = {
59                 {
60                         .addr   = EEPROM_I2C_ADDR,
61                         .flags  = 0,
62                         .buf    = &bufw[0],
63                         .len    = 2
64                 }
65         };
66
67         bufw[0] = addr;
68         bufw[1] = data;
69
70         ret = i2c_transfer(i2c_adap, msg, 1);
71
72         if (ret != 1) {
73                 pr_err("eeprom i2c write error, status=%d\n", ret);
74                 return -1;
75         }
76
77         mdelay(10); /* prophylactic delay, datasheet write cycle time = 5 ms */
78         return 0;
79 };
80
81 void netup_get_card_info(struct i2c_adapter *i2c_adap,
82                                 struct netup_card_info *cinfo)
83 {
84         int i, j;
85
86         cinfo->rev =  netup_eeprom_read(i2c_adap, 63);
87
88         for (i = 64, j = 0; i < 70; i++, j++)
89                 cinfo->port[0].mac[j] =  netup_eeprom_read(i2c_adap, i);
90
91         for (i = 70, j = 0; i < 76; i++, j++)
92                 cinfo->port[1].mac[j] =  netup_eeprom_read(i2c_adap, i);
93 };