drivers/usb/gadget/function/u_ether_configfs.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * u_ether_configfs.h
   4  *
   5  * Utility definitions for configfs support in USB Ethernet functions
   6  *
   7  * Copyright (c) 2013 Samsung Electronics Co., Ltd.
   8  *              http://www.samsung.com
   9  *
  10  * Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
  11  */
  12
  13 #ifndef __U_ETHER_CONFIGFS_H
  14 #define __U_ETHER_CONFIGFS_H
  15
  16 #define USB_ETHERNET_CONFIGFS_ITEM(_f_)                                 \
  17         static void _f_##_attr_release(struct config_item *item)        \
  18         {                                                               \
  19                 struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);  \
  20                                                                         \
  21                 usb_put_function_instance(&opts->func_inst);            \
  22         }                                                               \
  23                                                                         \
  24         static struct configfs_item_operations _f_##_item_ops = {       \
  25                 .release        = _f_##_attr_release,                   \
  26         }
  27
  28 #define USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(_f_)                   \
  29         static ssize_t _f_##_opts_dev_addr_show(struct config_item *item, \
  30                                                 char *page)             \
  31         {                                                               \
  32                 struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);  \
  33                 int result;                                             \
  34                                                                         \
  35                 mutex_lock(&opts->lock);                                \
  36                 result = gether_get_dev_addr(opts->net, page, PAGE_SIZE); \
  37                 mutex_unlock(&opts->lock);                              \
  38                                                                         \
  39                 return result;                                          \
  40         }                                                               \
  41                                                                         \
  42         static ssize_t _f_##_opts_dev_addr_store(struct config_item *item, \
  43                                                  const char *page, size_t len)\
  44         {                                                               \
  45                 struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);  \
  46                 int ret;                                                \
  47                                                                         \
  48                 mutex_lock(&opts->lock);                                \
  49                 if (opts->refcnt) {                                     \
  50                         mutex_unlock(&opts->lock);                      \
  51                         return -EBUSY;                                  \
  52                 }                                                       \
  53                                                                         \
  54                 ret = gether_set_dev_addr(opts->net, page);             \
  55                 mutex_unlock(&opts->lock);                              \
  56                 if (!ret)                                               \
  57                         ret = len;                                      \
  58                 return ret;                                             \
  59         }                                                               \
  60                                                                         \
  61         CONFIGFS_ATTR(_f_##_opts_, dev_addr)
  62
  63 #define USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(_f_)                  \
  64         static ssize_t _f_##_opts_host_addr_show(struct config_item *item, \
  65                                                  char *page)            \
  66         {                                                               \
  67                 struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);  \
  68                 int result;                                             \
  69                                                                         \
  70                 mutex_lock(&opts->lock);                                \
  71                 result = gether_get_host_addr(opts->net, page, PAGE_SIZE); \
  72                 mutex_unlock(&opts->lock);                              \
  73                                                                         \
  74                 return result;                                          \
  75         }                                                               \
  76                                                                         \
  77         static ssize_t _f_##_opts_host_addr_store(struct config_item *item, \
  78                                                   const char *page, size_t len)\
  79         {                                                               \
  80                 struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);  \
  81                 int ret;                                                \
  82                                                                         \
  83                 mutex_lock(&opts->lock);                                \
  84                 if (opts->refcnt) {                                     \
  85                         mutex_unlock(&opts->lock);                      \
  86                         return -EBUSY;                                  \
  87                 }                                                       \
  88                                                                         \
  89                 ret = gether_set_host_addr(opts->net, page);            \
  90                 mutex_unlock(&opts->lock);                              \
  91                 if (!ret)                                               \
  92                         ret = len;                                      \
  93                 return ret;                                             \
  94         }                                                               \
  95                                                                         \
  96         CONFIGFS_ATTR(_f_##_opts_, host_addr)
  97
  98 #define USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(_f_)                      \
  99         static ssize_t _f_##_opts_qmult_show(struct config_item *item,  \
 100                                              char *page)                \
 101         {                                                               \
 102                 struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);  \
 103                 unsigned qmult;                                         \
 104                                                                         \
 105                 mutex_lock(&opts->lock);                                \
 106                 qmult = gether_get_qmult(opts->net);                    \
 107                 mutex_unlock(&opts->lock);                              \
 108                 return sprintf(page, "%d\n", qmult);                    \
 109         }                                                               \
 110                                                                         \
 111         static ssize_t _f_##_opts_qmult_store(struct config_item *item, \
 112                                               const char *page, size_t len)\
 113         {                                                               \
 114                 struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);  \
 115                 u8 val;                                                 \
 116                 int ret;                                                \
 117                                                                         \
 118                 mutex_lock(&opts->lock);                                \
 119                 if (opts->refcnt) {                                     \
 120                         ret = -EBUSY;                                   \
 121                         goto out;                                       \
 122                 }                                                       \
 123                                                                         \
 124                 ret = kstrtou8(page, 0, &val);                          \
 125                 if (ret)                                                \
 126                         goto out;                                       \
 127                                                                         \
 128                 gether_set_qmult(opts->net, val);                       \
 129                 ret = len;                                              \
 130 out:                                                                    \
 131                 mutex_unlock(&opts->lock);                              \
 132                 return ret;                                             \
 133         }                                                               \
 134                                                                         \
 135         CONFIGFS_ATTR(_f_##_opts_, qmult)
 136
 137 #define USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(_f_)                     \
 138         static ssize_t _f_##_opts_ifname_show(struct config_item *item, \
 139                                               char *page)               \
 140         {                                                               \
 141                 struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);  \
 142                 int ret;                                                \
 143                                                                         \
 144                 mutex_lock(&opts->lock);                                \
 145                 ret = gether_get_ifname(opts->net, page, PAGE_SIZE);    \
 146                 mutex_unlock(&opts->lock);                              \
 147                                                                         \
 148                 return ret;                                             \
 149         }                                                               \
 150                                                                         \
 151         CONFIGFS_ATTR_RO(_f_##_opts_, ifname)
 152
 153 #define USB_ETHER_CONFIGFS_ITEM_ATTR_U8_RW(_f_, _n_)                    \
 154         static ssize_t _f_##_opts_##_n_##_show(struct config_item *item,\
 155                                                char *page)              \
 156         {                                                               \
 157                 struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);  \
 158                 int ret;                                                \
 159                                                                         \
 160                 mutex_lock(&opts->lock);                                \
 161                 ret = sprintf(page, "%02x\n", opts->_n_);               \
 162                 mutex_unlock(&opts->lock);                              \
 163                                                                         \
 164                 return ret;                                             \
 165         }                                                               \
 166                                                                         \
 167         static ssize_t _f_##_opts_##_n_##_store(struct config_item *item,\
 168                                                 const char *page,       \
 169                                                 size_t len)             \
 170         {                                                               \
 171                 struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);  \
 172                 int ret;                                                \
 173                 u8 val;                                                 \
 174                                                                         \
 175                 mutex_lock(&opts->lock);                                \
 176                 ret = sscanf(page, "%02hhx", &val);                     \
 177                 if (ret > 0) {                                          \
 178                         opts->_n_ = val;                                \
 179                         ret = len;                                      \
 180                 }                                                       \
 181                 mutex_unlock(&opts->lock);                              \
 182                                                                         \
 183                 return ret;                                             \
 184         }                                                               \
 185                                                                         \
 186         CONFIGFS_ATTR(_f_##_opts_, _n_)
 187
 188 #endif /* __U_ETHER_CONFIGFS_H */