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eeprom: at24: fix reading from 24MAC402/24MAC602

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Chip datasheet mentions that word addresses other than the actual
start position of the MAC delivers undefined results. So fix this.
Current implementation doesn't work due to this wrong offset.

Cc: [email protected]
Fixes: 0b813658c1 ("eeprom: at24: add support for at24mac series")
Signed-off-by: Heiner Kallweit <[email protected]>
Signed-off-by: Bartosz Golaszewski <[email protected]>
This commit is contained in:
Heiner Kallweit 2017-11-27 20:46:22 +01:00 • committed by Bartosz Golaszewski
commit 644a1f19c6
1 changed files with 2 additions and 1 deletions
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3
drivers/misc/eeprom/at24.c
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@ -425,7 +425,8 @@ static ssize_t at24_eeprom_read_mac(struct at24_data *at24, char *buf,
memset(msg, 0, sizeof(msg));
msg[0].addr = client->addr;
msg[0].buf = addrbuf;
addrbuf[0] = 0x90 + offset;
/* EUI-48 starts from 0x9a, EUI-64 from 0x98 */
addrbuf[0] = 0xa0 - at24->chip.byte_len + offset;
msg[0].len = 1;
msg[1].addr = client->addr;
msg[1].flags = I2C_M_RD;