drivers/net/phy/mdio-boardinfo.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * mdio-boardinfo - Collect pre-declarations for MDIO devices
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/slab.h>
   8 #include <linux/export.h>
   9 #include <linux/mutex.h>
  10 #include <linux/list.h>
  11
  12 #include "mdio-boardinfo.h"
  13
  14 static LIST_HEAD(mdio_board_list);
  15 static DEFINE_MUTEX(mdio_board_lock);
  16
  17 /**
  18  * mdiobus_setup_mdiodev_from_board_info - create and setup MDIO devices
  19  * from pre-collected board specific MDIO information
  20  * @bus: Bus the board_info belongs to
  21  * @cb: Callback to create device on bus
  22  * Context: can sleep
  23  */
  24 void mdiobus_setup_mdiodev_from_board_info(struct mii_bus *bus,
  25                                            int (*cb)
  26                                            (struct mii_bus *bus,
  27                                             struct mdio_board_info *bi))
  28 {
  29         struct mdio_board_entry *be;
  30         struct mdio_board_entry *tmp;
  31         struct mdio_board_info *bi;
  32         int ret;
  33
  34         mutex_lock(&mdio_board_lock);
  35         list_for_each_entry_safe(be, tmp, &mdio_board_list, list) {
  36                 bi = &be->board_info;
  37
  38                 if (strcmp(bus->id, bi->bus_id))
  39                         continue;
  40
  41                 mutex_unlock(&mdio_board_lock);
  42                 ret = cb(bus, bi);
  43                 mutex_lock(&mdio_board_lock);
  44                 if (ret)
  45                         continue;
  46
  47         }
  48         mutex_unlock(&mdio_board_lock);
  49 }
  50 EXPORT_SYMBOL(mdiobus_setup_mdiodev_from_board_info);
  51
  52 /**
  53  * mdio_register_board_info - register MDIO devices for a given board
  54  * @info: array of devices descriptors
  55  * @n: number of descriptors provided
  56  * Context: can sleep
  57  *
  58  * The board info passed can be marked with __initdata but be pointers
  59  * such as platform_data etc. are copied as-is
  60  */
  61 int mdiobus_register_board_info(const struct mdio_board_info *info,
  62                                 unsigned int n)
  63 {
  64         struct mdio_board_entry *be;
  65         unsigned int i;
  66
  67         be = kcalloc(n, sizeof(*be), GFP_KERNEL);
  68         if (!be)
  69                 return -ENOMEM;
  70
  71         for (i = 0; i < n; i++, be++, info++) {
  72                 memcpy(&be->board_info, info, sizeof(*info));
  73                 mutex_lock(&mdio_board_lock);
  74                 list_add_tail(&be->list, &mdio_board_list);
  75                 mutex_unlock(&mdio_board_lock);
  76         }
  77
  78         return 0;
  79 }
  80 EXPORT_SYMBOL(mdiobus_register_board_info);