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net: ethernet: provide nvmem_get_mac_address()

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We already have of_get_nvmem_mac_address() but some non-DT systems want
to read the MAC address from NVMEM too. Implement a generalized routine
that takes struct device as argument.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bartosz Golaszewski 2018-11-30 09:20:57 +01:00 committed by David S. Miller
parent 82208d0d54
commit 0e839df92c
2 changed files with 39 additions and 0 deletions
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1
include/linux/etherdevice.h
View File

@ -32,6 +32,7 @@
struct device;
int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr);
unsigned char *arch_get_platform_mac_address(void);
int nvmem_get_mac_address(struct device *dev, void *addrbuf);
u32 eth_get_headlen(void *data, unsigned int max_len);
__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev);
extern const struct header_ops eth_header_ops;

38
net/ethernet/eth.c
View File

@ -47,6 +47,7 @@
#include <linux/inet.h>
#include <linux/ip.h>
#include <linux/netdevice.h>
#include <linux/nvmem-consumer.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
@ -550,3 +551,40 @@ int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
return 0;
}
EXPORT_SYMBOL(eth_platform_get_mac_address);
/**
* Obtain the MAC address from an nvmem cell named 'mac-address' associated
* with given device.
*
* @dev: Device with which the mac-address cell is associated.
* @addrbuf: Buffer to which the MAC address will be copied on success.
*
* Returns 0 on success or a negative error number on failure.
*/
int nvmem_get_mac_address(struct device *dev, void *addrbuf)
{
struct nvmem_cell *cell;
const void *mac;
size_t len;
cell = nvmem_cell_get(dev, "mac-address");
if (IS_ERR(cell))
return PTR_ERR(cell);
mac = nvmem_cell_read(cell, &len);
nvmem_cell_put(cell);
if (IS_ERR(mac))
return PTR_ERR(mac);
if (len != ETH_ALEN || !is_valid_ether_addr(mac)) {
kfree(mac);
return -EINVAL;
}
ether_addr_copy(addrbuf, mac);
kfree(mac);
return 0;
}
EXPORT_SYMBOL(nvmem_get_mac_address);