package/kernel/mac80211/patches/rt2x00/602-05-wifi-rt2x00-support-loading-eeprom-from-NVMEM-cells.patch

   1 From 9008cdacdc41f8233f4444b86cf3a17201686e2d Mon Sep 17 00:00:00 2001
   2 From: Shiji Yang <yangshiji66@outlook.com>
   3 Date: Tue, 18 Jul 2023 20:18:16 +0800
   4 Subject: [PATCH 5/5] wifi: rt2x00: support loading eeprom from NVMEM cells
   5
   6 This patch allows rt2x00 to load eeprom from "eeprom" NVMEM cell.
   7
   8 Example:
   9
  10 /* load eeprom from NVMEM provider 'eep' */
  11 &wmac {
  12         nvmem-cells = <&eep>;
  13         nvmem-cell-names = "eeprom";
  14 };
  15
  16 Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
  17 Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
  18 ---
  19  .../net/wireless/ralink/rt2x00/rt2x00eeprom.c | 41 ++++++++++++++++++-
  20  1 file changed, 40 insertions(+), 1 deletion(-)
  21
  22 --- a/drivers/net/wireless/ralink/rt2x00/rt2x00eeprom.c
  23 +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00eeprom.c
  24 @@ -14,12 +14,12 @@
  25  #include <linux/mtd/mtd.h>
  26  #include <linux/mtd/partitions.h>
  27  #endif
  28 +#include <linux/nvmem-consumer.h>
  29  #include <linux/of.h>
  30
  31  #include "rt2x00.h"
  32  #include "rt2x00soc.h"
  33
  34 -#if IS_ENABLED(CONFIG_MTD)
  35  static void rt2800lib_eeprom_swap(struct rt2x00_dev *rt2x00dev)
  36  {
  37         struct device_node *np = rt2x00dev->dev->of_node;
  38 @@ -33,6 +33,7 @@ static void rt2800lib_eeprom_swap(struct
  39                 rt2x00dev->eeprom[i] = swab16(rt2x00dev->eeprom[i]);
  40  }
  41
  42 +#if IS_ENABLED(CONFIG_MTD)
  43  static int rt2800lib_read_eeprom_mtd(struct rt2x00_dev *rt2x00dev)
  44  {
  45         int ret = -EINVAL;
  46 @@ -88,6 +89,40 @@ static int rt2800lib_read_eeprom_mtd(str
  47  }
  48  #endif
  49
  50 +static int rt2800lib_read_eeprom_nvmem(struct rt2x00_dev *rt2x00dev)
  51 +{
  52 +       struct device_node *np = rt2x00dev->dev->of_node;
  53 +       unsigned int len = rt2x00dev->ops->eeprom_size;
  54 +       struct nvmem_cell *cell;
  55 +       const void *data;
  56 +       size_t retlen;
  57 +       int ret = 0;
  58 +
  59 +       cell = of_nvmem_cell_get(np, "eeprom");
  60 +       if (IS_ERR(cell))
  61 +               return PTR_ERR(cell);
  62 +
  63 +       data = nvmem_cell_read(cell, &retlen);
  64 +       nvmem_cell_put(cell);
  65 +
  66 +       if (IS_ERR(data))
  67 +               return PTR_ERR(data);
  68 +
  69 +       if (retlen != len) {
  70 +               dev_err(rt2x00dev->dev, "invalid eeprom size, required: 0x%04x\n", len);
  71 +               ret = -EINVAL;
  72 +               goto exit;
  73 +       }
  74 +
  75 +       memcpy(rt2x00dev->eeprom, data, len);
  76 +
  77 +       rt2800lib_eeprom_swap(rt2x00dev);
  78 +
  79 +exit:
  80 +       kfree(data);
  81 +       return ret;
  82 +}
  83 +
  84  static const char *
  85  rt2x00lib_get_eeprom_file_name(struct rt2x00_dev *rt2x00dev)
  86  {
  87 @@ -164,5 +199,9 @@ int rt2x00lib_read_eeprom(struct rt2x00_
  88                 return 0;
  89  #endif
  90
  91 +       ret = rt2800lib_read_eeprom_nvmem(rt2x00dev);
  92 +       if (!ret)
  93 +               return 0;
  94 +
  95         return rt2x00lib_read_eeprom_file(rt2x00dev);
  96  }