git.openwrt.org Git - openwrt/openwrt.git/blob

   1 From 71261ca81b491a4c3b08690347c12e96a75ad0d0 Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Sun, 17 Mar 2013 00:55:04 +0100
   4 Subject: [PATCH 3/5] wifi: rt2x00: Add support for loading EEPROM from MTD
   5
   6 Add support for loading EEPROM from MTD.
   7
   8 Signed-off-by: John Crispin <blogic@openwrt.org>
   9 Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
  10 ---
  11  drivers/net/wireless/ralink/rt2x00/Kconfig    |  1 +
  12  .../net/wireless/ralink/rt2x00/rt2x00eeprom.c | 66 +++++++++++++++++++
  13  2 files changed, 67 insertions(+)
  14
  15 --- a/drivers/net/wireless/ralink/rt2x00/Kconfig
  16 +++ b/drivers/net/wireless/ralink/rt2x00/Kconfig
  17 @@ -220,6 +220,7 @@ config RT2800SOC
  18         select RT2X00_LIB_EEPROM
  19         select RT2800_LIB
  20         select RT2800_LIB_MMIO
  21 +       select MTD if SOC_RT288X || SOC_RT305X
  22         help
  23           This adds support for Ralink WiSoC devices.
  24           Supported chips: RT2880, RT3050, RT3052, RT3350, RT3352.
  25 --- a/drivers/net/wireless/ralink/rt2x00/rt2x00eeprom.c
  26 +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00eeprom.c
  27 @@ -11,10 +11,66 @@
  28  #include <linux/kernel.h>
  29  #include <linux/module.h>
  30  #include <linux/of.h>
  31 +#if IS_ENABLED(CONFIG_MTD)
  32 +#include <linux/mtd/mtd.h>
  33 +#include <linux/mtd/partitions.h>
  34 +#endif
  35
  36  #include "rt2x00.h"
  37  #include "rt2x00soc.h"
  38
  39 +#if IS_ENABLED(CONFIG_MTD)
  40 +static int rt2800lib_read_eeprom_mtd(struct rt2x00_dev *rt2x00dev)
  41 +{
  42 +       struct device_node *np = rt2x00dev->dev->of_node, *mtd_np = NULL;
  43 +       int size, offset = 0;
  44 +       struct mtd_info *mtd;
  45 +       const char *part;
  46 +       const __be32 *list;
  47 +       phandle phandle;
  48 +       size_t retlen;
  49 +       int ret;
  50 +
  51 +       list = of_get_property(np, "ralink,mtd-eeprom", &size);
  52 +       if (!list)
  53 +               return -ENOENT;
  54 +
  55 +       phandle = be32_to_cpup(list++);
  56 +       if (phandle)
  57 +               mtd_np = of_find_node_by_phandle(phandle);
  58 +       if (!mtd_np) {
  59 +               dev_err(rt2x00dev->dev, "failed to load mtd phandle\n");
  60 +               return -EINVAL;
  61 +       }
  62 +
  63 +       part = of_get_property(mtd_np, "label", NULL);
  64 +       if (!part)
  65 +               part = mtd_np->name;
  66 +
  67 +       mtd = get_mtd_device_nm(part);
  68 +       if (IS_ERR(mtd)) {
  69 +               dev_err(rt2x00dev->dev, "failed to get mtd device \"%s\"\n", part);
  70 +               return PTR_ERR(mtd);
  71 +       }
  72 +
  73 +       if (size > sizeof(*list))
  74 +               offset = be32_to_cpup(list);
  75 +
  76 +       ret = mtd_read(mtd, offset, rt2x00dev->ops->eeprom_size,
  77 +                      &retlen, (u_char *)rt2x00dev->eeprom);
  78 +       put_mtd_device(mtd);
  79 +
  80 +       if (ret || retlen != rt2x00dev->ops->eeprom_size) {
  81 +               dev_err(rt2x00dev->dev, "failed to load eeprom from device \"%s\"\n", part);
  82 +               return ret;
  83 +       }
  84 +
  85 +       dev_info(rt2x00dev->dev, "loaded eeprom from mtd device \"%s\"\n", part);
  86 +
  87 +       return ret;
  88 +}
  89 +#endif
  90 +
  91  static const char *
  92  rt2x00lib_get_eeprom_file_name(struct rt2x00_dev *rt2x00dev)
  93  {
  94 @@ -74,6 +130,14 @@ err_exit:
  95
  96  int rt2x00lib_read_eeprom(struct rt2x00_dev *rt2x00dev)
  97  {
  98 +       int ret;
  99 +
 100 +#if IS_ENABLED(CONFIG_MTD)
 101 +       ret = rt2800lib_read_eeprom_mtd(rt2x00dev);
 102 +       if (!ret)
 103 +               return 0;
 104 +#endif
 105 +
 106         return rt2x00lib_read_eeprom_file(rt2x00dev);
 107  }
 108  EXPORT_SYMBOL_GPL(rt2x00lib_read_eeprom);