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mediatek: add driver for Adtran MFGINFO NVMEM layout
This driver allows retrieving MAC addresses and other factory information via the NVMEM framework on Adtran devices. Signed-off-by: Daniel Golle <[email protected]>
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target/linux/mediatek/patches-6.6/450-nvmem-add-layout-for-Adtran-devices.patch
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,191 @@ | ||
| From c22bc82183c2dea64919f975473ec518738baa3e Mon Sep 17 00:00:00 2001 | ||
| From: Daniel Golle <[email protected]> | ||
| Date: Wed, 12 Jul 2023 13:38:35 +0100 | ||
| Subject: [PATCH] nvmem: add layout for Adtran devices | ||
|
|
||
| Adtran stores unique factory data on GPT partitions on the eMMC. | ||
| Using blk-nvmem the 'mfginfo' partition gets exposes as NVMEM provider. | ||
|
|
||
| Add layout driver to parse mfginfo, mainly to provide MAC addresses to | ||
| Ethernet and wireless interfaces. | ||
|
|
||
| Variable names are converted to lower-case and '_' is replaced with '-' | ||
| in order to comply with the device tree node naming convention. | ||
| The main MAC address always ends on a 0 and up to 16 addresses are | ||
| alocated for each device to use for various interfaces. | ||
|
|
||
| Implement post-processing function for 'MFG_MAC' variable ('mfg-mac' | ||
| node name in device tree) adding the nvmem cell index to the least | ||
| significant digit of the MAC address. | ||
|
|
||
| Signed-off-by: Daniel Golle <[email protected]> | ||
| --- | ||
| drivers/nvmem/layouts/Kconfig | 9 +++ | ||
| drivers/nvmem/layouts/Makefile | 1 + | ||
| drivers/nvmem/layouts/adtran.c | 135 +++++++++++++++++++++++++++++++++ | ||
| 3 files changed, 145 insertions(+) | ||
| create mode 100644 drivers/nvmem/layouts/adtran.c | ||
|
|
||
| --- a/drivers/nvmem/layouts/Kconfig | ||
| +++ b/drivers/nvmem/layouts/Kconfig | ||
| @@ -8,6 +8,15 @@ if NVMEM_LAYOUTS | ||
|
|
||
| menu "Layout Types" | ||
|
|
||
| +config NVMEM_LAYOUT_ADTRAN | ||
| + tristate "Adtran mfginfo layout support" | ||
| + select GENERIC_NET_UTILS | ||
| + help | ||
| + Say Y here if you want to support the layout used by Adtran for | ||
| + mfginfo. | ||
| + | ||
| + If unsure, say N. | ||
| + | ||
| config NVMEM_LAYOUT_SL28_VPD | ||
| tristate "Kontron sl28 VPD layout support" | ||
| select CRC8 | ||
| --- a/drivers/nvmem/layouts/Makefile | ||
| +++ b/drivers/nvmem/layouts/Makefile | ||
| @@ -6,3 +6,4 @@ | ||
| obj-$(CONFIG_NVMEM_LAYOUT_SL28_VPD) += sl28vpd.o | ||
| obj-$(CONFIG_NVMEM_LAYOUT_ONIE_TLV) += onie-tlv.o | ||
| obj-$(CONFIG_NVMEM_LAYOUT_U_BOOT_ENV) += u-boot-env.o | ||
| +obj-$(CONFIG_NVMEM_LAYOUT_ADTRAN) += adtran.o | ||
| --- /dev/null | ||
| +++ b/drivers/nvmem/layouts/adtran.c | ||
| @@ -0,0 +1,135 @@ | ||
| +// SPDX-License-Identifier: GPL-2.0 | ||
| +#include <linux/ctype.h> | ||
| +#include <linux/etherdevice.h> | ||
| +#include <linux/nvmem-consumer.h> | ||
| +#include <linux/nvmem-provider.h> | ||
| +#include <linux/of.h> | ||
| +#include <linux/platform_device.h> | ||
| + | ||
| +/* | ||
| + * Adtran devices usually come with a main MAC address ending on 0 and | ||
| + * hence may have up to 16 MAC addresses per device. | ||
| + * The main MAC address is stored as variable MFG_MAC in ASCII format. | ||
| + */ | ||
| +static int adtran_mac_address_pp(void *priv, const char *id, int index, | ||
| + unsigned int offset, void *buf, | ||
| + size_t bytes) | ||
| +{ | ||
| + u8 mac[ETH_ALEN]; | ||
| + | ||
| + if (WARN_ON(bytes != 3 * ETH_ALEN - 1)) | ||
| + return -EINVAL; | ||
| + | ||
| + if (!mac_pton(buf, mac)) | ||
| + return -EINVAL; | ||
| + | ||
| + if (index) | ||
| + eth_addr_add(mac, index); | ||
| + | ||
| + ether_addr_copy(buf, mac); | ||
| + | ||
| + return 0; | ||
| +} | ||
| + | ||
| +static int adtran_add_cells(struct nvmem_layout *layout) | ||
| +{ | ||
| + struct nvmem_device *nvmem = layout->nvmem; | ||
| + struct nvmem_cell_info info; | ||
| + struct device_node *layout_np; | ||
| + char mfginfo[1024], *c, *t, *p; | ||
| + int ret = -EINVAL; | ||
| + | ||
| + ret = nvmem_device_read(nvmem, 0, sizeof(mfginfo), mfginfo); | ||
| + if (ret < 0) | ||
| + return ret; | ||
| + else if (ret != sizeof(mfginfo)) | ||
| + return -EIO; | ||
| + | ||
| + layout_np = of_nvmem_layout_get_container(nvmem); | ||
| + if (!layout_np) | ||
| + return -ENOENT; | ||
| + | ||
| + c = mfginfo; | ||
| + while (*c != 0xff) { | ||
| + memset(&info, 0, sizeof(info)); | ||
| + if (*c == '#') | ||
| + goto nextline; | ||
| + | ||
| + t = strchr(c, '='); | ||
| + if (!t) | ||
| + goto nextline; | ||
| + | ||
| + *t = '\0'; | ||
| + ++t; | ||
| + info.offset = t - mfginfo; | ||
| + /* process variable name: convert to lower-case, '_' -> '-' */ | ||
| + p = c; | ||
| + do { | ||
| + *p = tolower(*p); | ||
| + if (*p == '_') | ||
| + *p = '-'; | ||
| + } while (*++p); | ||
| + info.name = c; | ||
| + c = strchr(t, 0xa); /* find newline */ | ||
| + if (!c) | ||
| + break; | ||
| + | ||
| + info.bytes = c - t; | ||
| + if (!strcmp(info.name, "mfg-mac")) { | ||
| + info.raw_len = info.bytes; | ||
| + info.bytes = ETH_ALEN; | ||
| + info.read_post_process = adtran_mac_address_pp; | ||
| + } | ||
| + | ||
| + info.np = of_get_child_by_name(layout_np, info.name); | ||
| + ret = nvmem_add_one_cell(nvmem, &info); | ||
| + if (ret) | ||
| + break; | ||
| + | ||
| + ++c; | ||
| + continue; | ||
| + | ||
| +nextline: | ||
| + c = strchr(c, 0xa); /* find newline */ | ||
| + if (!c) | ||
| + break; | ||
| + ++c; | ||
| + } | ||
| + | ||
| + of_node_put(layout_np); | ||
| + | ||
| + return ret; | ||
| +} | ||
| + | ||
| +static int adtran_probe(struct nvmem_layout *layout) | ||
| +{ | ||
| + layout->add_cells = adtran_add_cells; | ||
| + | ||
| + return nvmem_layout_register(layout); | ||
| +} | ||
| + | ||
| +static void adtran_remove(struct nvmem_layout *layout) | ||
| +{ | ||
| + nvmem_layout_unregister(layout); | ||
| +} | ||
| + | ||
| +static const struct of_device_id adtran_of_match_table[] = { | ||
| + { .compatible = "adtran,mfginfo" }, | ||
| + {}, | ||
| +}; | ||
| +MODULE_DEVICE_TABLE(of, adtran_of_match_table); | ||
| + | ||
| +static struct nvmem_layout_driver adtran_layout = { | ||
| + .driver = { | ||
| + .owner = THIS_MODULE, | ||
| + .name = "adtran-layout", | ||
| + .of_match_table = adtran_of_match_table, | ||
| + }, | ||
| + .probe = adtran_probe, | ||
| + .remove = adtran_remove, | ||
| +}; | ||
| +module_nvmem_layout_driver(adtran_layout); | ||
| + | ||
| +MODULE_LICENSE("GPL"); | ||
| +MODULE_AUTHOR("Daniel Golle <[email protected]>"); | ||
| +MODULE_DESCRIPTION("NVMEM layout driver for Adtran mfginfo"); |