kernel/drivers/usb/gadget/function/u_ether_configfs.h

   1 /*
   2  * u_ether_configfs.h
   3  *
   4  * Utility definitions for configfs support in USB Ethernet functions
   5  *
   6  * Copyright (c) 2013 Samsung Electronics Co., Ltd.
   7  *              http://www.samsung.com
   8  *
   9  * Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #ifndef __U_ETHER_CONFIGFS_H
  17 #define __U_ETHER_CONFIGFS_H
  18
  19 #define USB_ETHERNET_CONFIGFS_ITEM(_f_)                                 \
  20         CONFIGFS_ATTR_STRUCT(f_##_f_##_opts);                           \
  21         CONFIGFS_ATTR_OPS(f_##_f_##_opts);                              \
  22                                                                         \
  23         static void _f_##_attr_release(struct config_item *item)        \
  24         {                                                               \
  25                 struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);  \
  26                                                                         \
  27                 usb_put_function_instance(&opts->func_inst);            \
  28         }                                                               \
  29                                                                         \
  30         static struct configfs_item_operations _f_##_item_ops = {       \
  31                 .release        = _f_##_attr_release,                   \
  32                 .show_attribute = f_##_f_##_opts_attr_show,             \
  33                 .store_attribute = f_##_f_##_opts_attr_store,           \
  34         }
  35
  36 #define USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(_f_)                   \
  37         static ssize_t _f_##_opts_dev_addr_show(struct f_##_f_##_opts *opts, \
  38                                                 char *page)             \
  39         {                                                               \
  40                 int result;                                             \
  41                                                                         \
  42                 mutex_lock(&opts->lock);                                \
  43                 result = gether_get_dev_addr(opts->net, page, PAGE_SIZE); \
  44                 mutex_unlock(&opts->lock);                              \
  45                                                                         \
  46                 return result;                                          \
  47         }                                                               \
  48                                                                         \
  49         static ssize_t _f_##_opts_dev_addr_store(struct f_##_f_##_opts *opts, \
  50                                                  const char *page, size_t len)\
  51         {                                                               \
  52                 int ret;                                                \
  53                                                                         \
  54                 mutex_lock(&opts->lock);                                \
  55                 if (opts->refcnt) {                                     \
  56                         mutex_unlock(&opts->lock);                      \
  57                         return -EBUSY;                                  \
  58                 }                                                       \
  59                                                                         \
  60                 ret = gether_set_dev_addr(opts->net, page);             \
  61                 mutex_unlock(&opts->lock);                              \
  62                 if (!ret)                                               \
  63                         ret = len;                                      \
  64                 return ret;                                             \
  65         }                                                               \
  66                                                                         \
  67         static struct f_##_f_##_opts_attribute f_##_f_##_opts_dev_addr = \
  68                 __CONFIGFS_ATTR(dev_addr, S_IRUGO | S_IWUSR,            \
  69                                 _f_##_opts_dev_addr_show,               \
  70                                 _f_##_opts_dev_addr_store)
  71
  72 #define USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(_f_)                  \
  73         static ssize_t _f_##_opts_host_addr_show(struct f_##_f_##_opts *opts, \
  74                                                  char *page)            \
  75         {                                                               \
  76                 int result;                                             \
  77                                                                         \
  78                 mutex_lock(&opts->lock);                                \
  79                 result = gether_get_host_addr(opts->net, page, PAGE_SIZE); \
  80                 mutex_unlock(&opts->lock);                              \
  81                                                                         \
  82                 return result;                                          \
  83         }                                                               \
  84                                                                         \
  85         static ssize_t _f_##_opts_host_addr_store(struct f_##_f_##_opts *opts, \
  86                                                   const char *page, size_t len)\
  87         {                                                               \
  88                 int ret;                                                \
  89                                                                         \
  90                 mutex_lock(&opts->lock);                                \
  91                 if (opts->refcnt) {                                     \
  92                         mutex_unlock(&opts->lock);                      \
  93                         return -EBUSY;                                  \
  94                 }                                                       \
  95                                                                         \
  96                 ret = gether_set_host_addr(opts->net, page);            \
  97                 mutex_unlock(&opts->lock);                              \
  98                 if (!ret)                                               \
  99                         ret = len;                                      \
 100                 return ret;                                             \
 101         }                                                               \
 102                                                                         \
 103         static struct f_##_f_##_opts_attribute f_##_f_##_opts_host_addr = \
 104                 __CONFIGFS_ATTR(host_addr, S_IRUGO | S_IWUSR,           \
 105                                 _f_##_opts_host_addr_show,              \
 106                                 _f_##_opts_host_addr_store)
 107
 108 #define USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(_f_)                      \
 109         static ssize_t _f_##_opts_qmult_show(struct f_##_f_##_opts *opts, \
 110                                              char *page)                \
 111         {                                                               \
 112                 unsigned qmult;                                         \
 113                                                                         \
 114                 mutex_lock(&opts->lock);                                \
 115                 qmult = gether_get_qmult(opts->net);                    \
 116                 mutex_unlock(&opts->lock);                              \
 117                 return sprintf(page, "%d", qmult);                      \
 118         }                                                               \
 119                                                                         \
 120         static ssize_t _f_##_opts_qmult_store(struct f_##_f_##_opts *opts, \
 121                                               const char *page, size_t len)\
 122         {                                                               \
 123                 u8 val;                                                 \
 124                 int ret;                                                \
 125                                                                         \
 126                 mutex_lock(&opts->lock);                                \
 127                 if (opts->refcnt) {                                     \
 128                         ret = -EBUSY;                                   \
 129                         goto out;                                       \
 130                 }                                                       \
 131                                                                         \
 132                 ret = kstrtou8(page, 0, &val);                          \
 133                 if (ret)                                                \
 134                         goto out;                                       \
 135                                                                         \
 136                 gether_set_qmult(opts->net, val);                       \
 137                 ret = len;                                              \
 138 out:                                                                    \
 139                 mutex_unlock(&opts->lock);                              \
 140                 return ret;                                             \
 141         }                                                               \
 142                                                                         \
 143         static struct f_##_f_##_opts_attribute f_##_f_##_opts_qmult =   \
 144                 __CONFIGFS_ATTR(qmult, S_IRUGO | S_IWUSR,               \
 145                                 _f_##_opts_qmult_show,          \
 146                                 _f_##_opts_qmult_store)
 147
 148 #define USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(_f_)                     \
 149         static ssize_t _f_##_opts_ifname_show(struct f_##_f_##_opts *opts, \
 150                                               char *page)               \
 151         {                                                               \
 152                 int ret;                                                \
 153                                                                         \
 154                 mutex_lock(&opts->lock);                                \
 155                 ret = gether_get_ifname(opts->net, page, PAGE_SIZE);    \
 156                 mutex_unlock(&opts->lock);                              \
 157                                                                         \
 158                 return ret;                                             \
 159         }                                                               \
 160                                                                         \
 161         static struct f_##_f_##_opts_attribute f_##_f_##_opts_ifname =  \
 162                 __CONFIGFS_ATTR_RO(ifname, _f_##_opts_ifname_show)
 163
 164 #endif /* __U_ETHER_CONFIGFS_H */