drivers/net/wireless/iwmc3200wifi/netdev.c

   1 /*
   2  * Intel Wireless Multicomm 3200 WiFi driver
   3  *
   4  * Copyright (C) 2009 Intel Corporation <ilw@linux.intel.com>
   5  * Samuel Ortiz <samuel.ortiz@intel.com>
   6  * Zhu Yi <yi.zhu@intel.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License version
  10  * 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  *
  22  */
  23
  24 /*
  25  * This is the netdev related hooks for iwm.
  26  *
  27  * Some interesting code paths:
  28  *
  29  * iwm_open() (Called at netdev interface bringup time)
  30  *  -> iwm_up() (main.c)
  31  *      -> iwm_bus_enable()
  32  *          -> if_sdio_enable() (In case of an SDIO bus)
  33  *              -> sdio_enable_func()
  34  *      -> iwm_notif_wait(BARKER_REBOOT) (wait for reboot barker)
  35  *      -> iwm_notif_wait(ACK_BARKER) (wait for ACK barker)
  36  *      -> iwm_load_fw() (fw.c)
  37  *          -> iwm_load_umac()
  38  *          -> iwm_load_lmac() (Calibration LMAC)
  39  *          -> iwm_load_lmac() (Operational LMAC)
  40  *      -> iwm_send_umac_config()
  41  *
  42  * iwm_stop() (Called at netdev interface bringdown time)
  43  *  -> iwm_down()
  44  *      -> iwm_bus_disable()
  45  *          -> if_sdio_disable() (In case of an SDIO bus)
  46  *              -> sdio_disable_func()
  47  */
  48 #include <linux/netdevice.h>
  49 #include <linux/slab.h>
  50
  51 #include "iwm.h"
  52 #include "commands.h"
  53 #include "cfg80211.h"
  54 #include "debug.h"
  55
  56 static int iwm_open(struct net_device *ndev)
  57 {
  58         struct iwm_priv *iwm = ndev_to_iwm(ndev);
  59
  60         return iwm_up(iwm);
  61 }
  62
  63 static int iwm_stop(struct net_device *ndev)
  64 {
  65         struct iwm_priv *iwm = ndev_to_iwm(ndev);
  66
  67         return iwm_down(iwm);
  68 }
  69
  70 /*
  71  * iwm AC to queue mapping
  72  *
  73  * AC_VO -> queue 3
  74  * AC_VI -> queue 2
  75  * AC_BE -> queue 1
  76  * AC_BK -> queue 0
  77  */
  78 static const u16 iwm_1d_to_queue[8] = { 1, 0, 0, 1, 2, 2, 3, 3 };
  79
  80 int iwm_tid_to_queue(u16 tid)
  81 {
  82         if (tid > IWM_UMAC_TID_NR - 2)
  83                 return -EINVAL;
  84
  85         return iwm_1d_to_queue[tid];
  86 }
  87
  88 static u16 iwm_select_queue(struct net_device *dev, struct sk_buff *skb)
  89 {
  90         skb->priority = cfg80211_classify8021d(skb);
  91
  92         return iwm_1d_to_queue[skb->priority];
  93 }
  94
  95 static const struct net_device_ops iwm_netdev_ops = {
  96         .ndo_open               = iwm_open,
  97         .ndo_stop               = iwm_stop,
  98         .ndo_start_xmit         = iwm_xmit_frame,
  99         .ndo_select_queue       = iwm_select_queue,
 100 };
 101
 102 void *iwm_if_alloc(int sizeof_bus, struct device *dev,
 103                    struct iwm_if_ops *if_ops)
 104 {
 105         struct net_device *ndev;
 106         struct wireless_dev *wdev;
 107         struct iwm_priv *iwm;
 108         int ret = 0;
 109
 110         wdev = iwm_wdev_alloc(sizeof_bus, dev);
 111         if (IS_ERR(wdev))
 112                 return wdev;
 113
 114         iwm = wdev_to_iwm(wdev);
 115         iwm->bus_ops = if_ops;
 116         iwm->wdev = wdev;
 117
 118         ret = iwm_priv_init(iwm);
 119         if (ret) {
 120                 dev_err(dev, "failed to init iwm_priv\n");
 121                 goto out_wdev;
 122         }
 123
 124         wdev->iftype = iwm_mode_to_nl80211_iftype(iwm->conf.mode);
 125
 126         ndev = alloc_netdev_mq(0, "wlan%d", ether_setup, IWM_TX_QUEUES);
 127         if (!ndev) {
 128                 dev_err(dev, "no memory for network device instance\n");
 129                 ret = -ENOMEM;
 130                 goto out_priv;
 131         }
 132
 133         ndev->netdev_ops = &iwm_netdev_ops;
 134         ndev->ieee80211_ptr = wdev;
 135         SET_NETDEV_DEV(ndev, wiphy_dev(wdev->wiphy));
 136         wdev->netdev = ndev;
 137
 138         iwm->umac_profile = kmalloc(sizeof(struct iwm_umac_profile),
 139                                     GFP_KERNEL);
 140         if (!iwm->umac_profile) {
 141                 dev_err(dev, "Couldn't alloc memory for profile\n");
 142                 ret = -ENOMEM;
 143                 goto out_profile;
 144         }
 145
 146         iwm_init_default_profile(iwm, iwm->umac_profile);
 147
 148         return iwm;
 149
 150  out_profile:
 151         free_netdev(ndev);
 152
 153  out_priv:
 154         iwm_priv_deinit(iwm);
 155
 156  out_wdev:
 157         iwm_wdev_free(iwm);
 158         return ERR_PTR(ret);
 159 }
 160
 161 void iwm_if_free(struct iwm_priv *iwm)
 162 {
 163         if (!iwm_to_ndev(iwm))
 164                 return;
 165
 166         cancel_delayed_work_sync(&iwm->ct_kill_delay);
 167         free_netdev(iwm_to_ndev(iwm));
 168         iwm_priv_deinit(iwm);
 169         kfree(iwm->umac_profile);
 170         iwm->umac_profile = NULL;
 171         iwm_wdev_free(iwm);
 172 }
 173
 174 int iwm_if_add(struct iwm_priv *iwm)
 175 {
 176         struct net_device *ndev = iwm_to_ndev(iwm);
 177         int ret;
 178
 179         ret = register_netdev(ndev);
 180         if (ret < 0) {
 181                 dev_err(&ndev->dev, "Failed to register netdev: %d\n", ret);
 182                 return ret;
 183         }
 184
 185         return 0;
 186 }
 187
 188 void iwm_if_remove(struct iwm_priv *iwm)
 189 {
 190         unregister_netdev(iwm_to_ndev(iwm));
 191 }