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 }; 94