From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bartosz Golaszewski Subject: [PATCH v2 10/25] net: ethernet: provide nvmem_get_mac_address() Date: Tue, 13 Nov 2018 15:01:18 +0100 Message-ID: <20181113140133.17385-11-brgl@bgdev.pl> References: <20181113140133.17385-1-brgl@bgdev.pl> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20181113140133.17385-1-brgl@bgdev.pl> Sender: netdev-owner@vger.kernel.org To: Sekhar Nori , Kevin Hilman , Russell King , Arnd Bergmann , Greg Kroah-Hartman , David Woodhouse , Brian Norris , Boris Brezillon , Marek Vasut , Richard Weinberger , Nicolas Ferre , "David S . Miller" , Grygorii Strashko , Srinivas Kandagatla , Andrew Lunn , Florian Fainelli , Rob Herring , Frank Rowand , Wolfram Sang Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, linux-mtd@lists.infradead.org, netdev@vger.kernel.org, linux-omap@vger.kernel.org, devicetree@vger.kernel.org, Bartosz Golaszewski List-Id: linux-i2c@vger.kernel.org From: Bartosz Golaszewski 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 --- include/linux/etherdevice.h | 1 + net/ethernet/eth.c | 38 +++++++++++++++++++++++++++++++++++++ 2 files changed, 39 insertions(+) diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h index 572e11bb8696..2c0af7b00715 100644 --- a/include/linux/etherdevice.h +++ b/include/linux/etherdevice.h @@ -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; diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c index fd8faa0dfa61..df38593d1bb4 100644 --- a/net/ethernet/eth.c +++ b/net/ethernet/eth.c @@ -47,6 +47,7 @@ #include #include #include +#include #include #include #include @@ -548,3 +549,40 @@ 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); -- 2.19.1