kernel: support reading hex MAC address from NVMEM

In addition to binary and ASCII-formatted MAC addresses, add support
for processing hexadecimal encoded MAC addresses from NVMEM.

Signed-off-by: Daniel Golle <[email protected]>

target/linux/generic/pending-5.15/804-nvmem-core-support-mac-base-fixed-layout-cells.patch

@@ -20,10 +20,11 @@ string.
  
 --- a/drivers/nvmem/core.c
 +++ b/drivers/nvmem/core.c
-@@ -7,9 +7,11 @@
+@@ -7,9 +7,12 @@
   */
  
  #include <linux/device.h>
++#include <linux/ctype.h>
 +#include <linux/etherdevice.h>
  #include <linux/export.h>
  #include <linux/fs.h>
@@ -32,7 +33,7 @@ string.
  #include <linux/init.h>
  #include <linux/kref.h>
  #include <linux/module.h>
-@@ -696,6 +698,37 @@ static int nvmem_validate_keepouts(struc
+@@ -696,6 +699,62 @@ static int nvmem_validate_keepouts(struc
  	return 0;
  }
  
@@ -66,25 +67,55 @@ string.
 +
 +	return 0;
 +}
++
++static int nvmem_mac_base_hex_read(void *context, const char *id, int index, unsigned int offset,
++				   void *buf, size_t bytes)
++{
++	u8 mac[ETH_ALEN], *hexstr;
++	int i;
++
++	if (WARN_ON(bytes != 2 * ETH_ALEN))
++		return -EINVAL;
++
++	hexstr = (u8 *)buf;
++	for (i = 0; i < ETH_ALEN; i++) {
++		if (!isxdigit(hexstr[i * 2]) || !isxdigit(hexstr[i * 2 + 1]))
++			return -EINVAL;
++
++		mac[i] = (hex_to_bin(hexstr[i * 2]) << 4) | hex_to_bin(hexstr[i * 2 + 1]);
++	}
++
++	if (index)
++		eth_addr_add(mac, index);
++
++	ether_addr_copy(buf, mac);
++
++	return 0;
++}
 +
  static int nvmem_add_cells_from_dt(struct nvmem_device *nvmem, struct device_node *np)
  {
  	struct nvmem_layout *layout = nvmem->layout;
-@@ -731,6 +764,20 @@ static int nvmem_add_cells_from_dt(struc
+@@ -731,6 +790,25 @@ static int nvmem_add_cells_from_dt(struc
  		if (layout && layout->fixup_cell_info)
  			layout->fixup_cell_info(nvmem, layout, &info);
  
 +		if (of_device_is_compatible(np, "fixed-layout")) {
 +			if (of_device_is_compatible(child, "mac-base")) {
-+				if (info.bytes == 6) {
++				if (info.bytes == ETH_ALEN) {
 +					info.raw_len = info.bytes;
 +					info.bytes = ETH_ALEN;
 +					info.read_post_process = nvmem_mac_base_raw_read;
++				} else if (info.bytes == 2 * ETH_ALEN) {
++					info.raw_len = info.bytes;
++					info.bytes = ETH_ALEN;
++					info.read_post_process = nvmem_mac_base_hex_read;
 +				} else if (info.bytes == 3 * ETH_ALEN - 1) {
 +					info.raw_len = info.bytes;
 +					info.bytes = ETH_ALEN;
 +					info.read_post_process = nvmem_mac_base_ascii_read;
 +				}
++
 +			}
 +		}
 +

target/linux/generic/pending-6.1/804-nvmem-core-support-mac-base-fixed-layout-cells.patch

@@ -20,10 +20,11 @@ string.
  
 --- a/drivers/nvmem/core.c
 +++ b/drivers/nvmem/core.c
-@@ -7,9 +7,11 @@
+@@ -7,9 +7,12 @@
   */
  
  #include <linux/device.h>
++#include <linux/ctype.h>
 +#include <linux/etherdevice.h>
  #include <linux/export.h>
  #include <linux/fs.h>
@@ -32,7 +33,7 @@ string.
  #include <linux/init.h>
  #include <linux/kref.h>
  #include <linux/module.h>
-@@ -696,6 +698,37 @@ static int nvmem_validate_keepouts(struc
+@@ -696,6 +699,62 @@ static int nvmem_validate_keepouts(struc
  	return 0;
  }
  
@@ -66,25 +67,55 @@ string.
 +
 +	return 0;
 +}
++
++static int nvmem_mac_base_hex_read(void *context, const char *id, int index, unsigned int offset,
++				   void *buf, size_t bytes)
++{
++	u8 mac[ETH_ALEN], *hexstr;
++	int i;
++
++	if (WARN_ON(bytes != 2 * ETH_ALEN))
++		return -EINVAL;
++
++	hexstr = (u8 *)buf;
++	for (i = 0; i < ETH_ALEN; i++) {
++		if (!isxdigit(hexstr[i * 2]) || !isxdigit(hexstr[i * 2 + 1]))
++			return -EINVAL;
++
++		mac[i] = (hex_to_bin(hexstr[i * 2]) << 4) | hex_to_bin(hexstr[i * 2 + 1]);
++	}
++
++	if (index)
++		eth_addr_add(mac, index);
++
++	ether_addr_copy(buf, mac);
++
++	return 0;
++}
 +
  static int nvmem_add_cells_from_dt(struct nvmem_device *nvmem, struct device_node *np)
  {
  	struct nvmem_layout *layout = nvmem->layout;
-@@ -731,6 +764,20 @@ static int nvmem_add_cells_from_dt(struc
+@@ -731,6 +790,25 @@ static int nvmem_add_cells_from_dt(struc
  		if (layout && layout->fixup_cell_info)
  			layout->fixup_cell_info(nvmem, layout, &info);
  
 +		if (of_device_is_compatible(np, "fixed-layout")) {
 +			if (of_device_is_compatible(child, "mac-base")) {
-+				if (info.bytes == 6) {
++				if (info.bytes == ETH_ALEN) {
 +					info.raw_len = info.bytes;
 +					info.bytes = ETH_ALEN;
 +					info.read_post_process = nvmem_mac_base_raw_read;
++				} else if (info.bytes == 2 * ETH_ALEN) {
++					info.raw_len = info.bytes;
++					info.bytes = ETH_ALEN;
++					info.read_post_process = nvmem_mac_base_hex_read;
 +				} else if (info.bytes == 3 * ETH_ALEN - 1) {
 +					info.raw_len = info.bytes;
 +					info.bytes = ETH_ALEN;
 +					info.read_post_process = nvmem_mac_base_ascii_read;
 +				}
++
 +			}
 +		}
 +