drivers/net/wireless/rsi/rsi_91x_main.c

   1 /**
   2  * Copyright (c) 2014 Redpine Signals Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19 #include <linux/module.h>
  20 #include <linux/firmware.h>
  21 #include "rsi_mgmt.h"
  22 #include "rsi_common.h"
  23
  24 u32 rsi_zone_enabled = /* INFO_ZONE |
  25                         INIT_ZONE |
  26                         MGMT_TX_ZONE |
  27                         MGMT_RX_ZONE |
  28                         DATA_TX_ZONE |
  29                         DATA_RX_ZONE |
  30                         FSM_ZONE |
  31                         ISR_ZONE | */
  32                         ERR_ZONE |
  33                         0;
  34 EXPORT_SYMBOL_GPL(rsi_zone_enabled);
  35
  36 /**
  37  * rsi_dbg() - This function outputs informational messages.
  38  * @zone: Zone of interest for output message.
  39  * @fmt: printf-style format for output message.
  40  *
  41  * Return: none
  42  */
  43 void rsi_dbg(u32 zone, const char *fmt, ...)
  44 {
  45         struct va_format vaf;
  46         va_list args;
  47
  48         va_start(args, fmt);
  49
  50         vaf.fmt = fmt;
  51         vaf.va = &args;
  52
  53         if (zone & rsi_zone_enabled)
  54                 pr_info("%pV", &vaf);
  55         va_end(args);
  56 }
  57 EXPORT_SYMBOL_GPL(rsi_dbg);
  58
  59 /**
  60  * rsi_prepare_skb() - This function prepares the skb.
  61  * @common: Pointer to the driver private structure.
  62  * @buffer: Pointer to the packet data.
  63  * @pkt_len: Length of the packet.
  64  * @extended_desc: Extended descriptor.
  65  *
  66  * Return: Successfully skb.
  67  */
  68 static struct sk_buff *rsi_prepare_skb(struct rsi_common *common,
  69                                        u8 *buffer,
  70                                        u32 pkt_len,
  71                                        u8 extended_desc)
  72 {
  73         struct ieee80211_tx_info *info;
  74         struct skb_info *rx_params;
  75         struct sk_buff *skb = NULL;
  76         u8 payload_offset;
  77
  78         if (WARN(!pkt_len, "%s: Dummy pkt received", __func__))
  79                 return NULL;
  80
  81         if (pkt_len > (RSI_RCV_BUFFER_LEN * 4)) {
  82                 rsi_dbg(ERR_ZONE, "%s: Pkt size > max rx buf size %d\n",
  83                         __func__, pkt_len);
  84                 pkt_len = RSI_RCV_BUFFER_LEN * 4;
  85         }
  86
  87         pkt_len -= extended_desc;
  88         skb = dev_alloc_skb(pkt_len + FRAME_DESC_SZ);
  89         if (skb == NULL)
  90                 return NULL;
  91
  92         payload_offset = (extended_desc + FRAME_DESC_SZ);
  93         skb_put(skb, pkt_len);
  94         memcpy((skb->data), (buffer + payload_offset), skb->len);
  95
  96         info = IEEE80211_SKB_CB(skb);
  97         rx_params = (struct skb_info *)info->driver_data;
  98         rx_params->rssi = rsi_get_rssi(buffer);
  99         rx_params->channel = rsi_get_connected_channel(common->priv);
 100
 101         return skb;
 102 }
 103
 104 /**
 105  * rsi_read_pkt() - This function reads frames from the card.
 106  * @common: Pointer to the driver private structure.
 107  * @rcv_pkt_len: Received pkt length. In case of USB it is 0.
 108  *
 109  * Return: 0 on success, -1 on failure.
 110  */
 111 int rsi_read_pkt(struct rsi_common *common, s32 rcv_pkt_len)
 112 {
 113         u8 *frame_desc = NULL, extended_desc = 0;
 114         u32 index, length = 0, queueno = 0;
 115         u16 actual_length = 0, offset;
 116         struct sk_buff *skb = NULL;
 117
 118         index = 0;
 119         do {
 120                 frame_desc = &common->rx_data_pkt[index];
 121                 actual_length = *(u16 *)&frame_desc[0];
 122                 offset = *(u16 *)&frame_desc[2];
 123
 124                 queueno = rsi_get_queueno(frame_desc, offset);
 125                 length = rsi_get_length(frame_desc, offset);
 126                 extended_desc = rsi_get_extended_desc(frame_desc, offset);
 127
 128                 switch (queueno) {
 129                 case RSI_WIFI_DATA_Q:
 130                         skb = rsi_prepare_skb(common,
 131                                               (frame_desc + offset),
 132                                               length,
 133                                               extended_desc);
 134                         if (skb == NULL)
 135                                 goto fail;
 136
 137                         rsi_indicate_pkt_to_os(common, skb);
 138                         break;
 139
 140                 case RSI_WIFI_MGMT_Q:
 141                         rsi_mgmt_pkt_recv(common, (frame_desc + offset));
 142                         break;
 143
 144                 default:
 145                         rsi_dbg(ERR_ZONE, "%s: pkt from invalid queue: %d\n",
 146                                 __func__,   queueno);
 147                         goto fail;
 148                 }
 149
 150                 index  += actual_length;
 151                 rcv_pkt_len -= actual_length;
 152         } while (rcv_pkt_len > 0);
 153
 154         return 0;
 155 fail:
 156         return -EINVAL;
 157 }
 158 EXPORT_SYMBOL_GPL(rsi_read_pkt);
 159
 160 /**
 161  * rsi_tx_scheduler_thread() - This function is a kernel thread to send the
 162  *                             packets to the device.
 163  * @common: Pointer to the driver private structure.
 164  *
 165  * Return: None.
 166  */
 167 static void rsi_tx_scheduler_thread(struct rsi_common *common)
 168 {
 169         struct rsi_hw *adapter = common->priv;
 170         u32 timeout = EVENT_WAIT_FOREVER;
 171
 172         do {
 173                 if (adapter->determine_event_timeout)
 174                         timeout = adapter->determine_event_timeout(adapter);
 175                 rsi_wait_event(&common->tx_thread.event, timeout);
 176                 rsi_reset_event(&common->tx_thread.event);
 177
 178                 if (common->init_done)
 179                         rsi_core_qos_processor(common);
 180         } while (atomic_read(&common->tx_thread.thread_done) == 0);
 181         complete_and_exit(&common->tx_thread.completion, 0);
 182 }
 183
 184 /**
 185  * rsi_91x_init() - This function initializes os interface operations.
 186  * @void: Void.
 187  *
 188  * Return: Pointer to the adapter structure on success, NULL on failure .
 189  */
 190 struct rsi_hw *rsi_91x_init(void)
 191 {
 192         struct rsi_hw *adapter = NULL;
 193         struct rsi_common *common = NULL;
 194         u8 ii = 0;
 195
 196         adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
 197         if (!adapter)
 198                 return NULL;
 199
 200         adapter->priv = kzalloc(sizeof(*common), GFP_KERNEL);
 201         if (adapter->priv == NULL) {
 202                 rsi_dbg(ERR_ZONE, "%s: Failed in allocation of memory\n",
 203                         __func__);
 204                 kfree(adapter);
 205                 return NULL;
 206         } else {
 207                 common = adapter->priv;
 208                 common->priv = adapter;
 209         }
 210
 211         for (ii = 0; ii < NUM_SOFT_QUEUES; ii++)
 212                 skb_queue_head_init(&common->tx_queue[ii]);
 213
 214         rsi_init_event(&common->tx_thread.event);
 215         mutex_init(&common->mutex);
 216         mutex_init(&common->tx_rxlock);
 217
 218         if (rsi_create_kthread(common,
 219                                &common->tx_thread,
 220                                rsi_tx_scheduler_thread,
 221                                "Tx-Thread")) {
 222                 rsi_dbg(ERR_ZONE, "%s: Unable to init tx thrd\n", __func__);
 223                 goto err;
 224         }
 225
 226         common->init_done = true;
 227         return adapter;
 228
 229 err:
 230         kfree(common);
 231         kfree(adapter);
 232         return NULL;
 233 }
 234 EXPORT_SYMBOL_GPL(rsi_91x_init);
 235
 236 /**
 237  * rsi_91x_deinit() - This function de-intializes os intf operations.
 238  * @adapter: Pointer to the adapter structure.
 239  *
 240  * Return: None.
 241  */
 242 void rsi_91x_deinit(struct rsi_hw *adapter)
 243 {
 244         struct rsi_common *common = adapter->priv;
 245         u8 ii;
 246
 247         rsi_dbg(INFO_ZONE, "%s: Performing deinit os ops\n", __func__);
 248
 249         rsi_kill_thread(&common->tx_thread);
 250
 251         for (ii = 0; ii < NUM_SOFT_QUEUES; ii++)
 252                 skb_queue_purge(&common->tx_queue[ii]);
 253
 254         common->init_done = false;
 255
 256         kfree(common);
 257         kfree(adapter->rsi_dev);
 258         kfree(adapter);
 259 }
 260 EXPORT_SYMBOL_GPL(rsi_91x_deinit);
 261
 262 /**
 263  * rsi_91x_hal_module_init() - This function is invoked when the module is
 264  *                             loaded into the kernel.
 265  *                             It registers the client driver.
 266  * @void: Void.
 267  *
 268  * Return: 0 on success, -1 on failure.
 269  */
 270 static int rsi_91x_hal_module_init(void)
 271 {
 272         rsi_dbg(INIT_ZONE, "%s: Module init called\n", __func__);
 273         return 0;
 274 }
 275
 276 /**
 277  * rsi_91x_hal_module_exit() - This function is called at the time of
 278  *                             removing/unloading the module.
 279  *                             It unregisters the client driver.
 280  * @void: Void.
 281  *
 282  * Return: None.
 283  */
 284 static void rsi_91x_hal_module_exit(void)
 285 {
 286         rsi_dbg(INIT_ZONE, "%s: Module exit called\n", __func__);
 287 }
 288
 289 module_init(rsi_91x_hal_module_init);
 290 module_exit(rsi_91x_hal_module_exit);
 291 MODULE_AUTHOR("Redpine Signals Inc");
 292 MODULE_DESCRIPTION("Station driver for RSI 91x devices");
 293 MODULE_SUPPORTED_DEVICE("RSI-91x");
 294 MODULE_VERSION("0.1");
 295 MODULE_LICENSE("Dual BSD/GPL");