drivers/net/wireless/mwifiex/debugfs.c

   1 /*
   2  * Marvell Wireless LAN device driver: debugfs
   3  *
   4  * Copyright (C) 2011, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include <linux/debugfs.h>
  21
  22 #include "main.h"
  23 #include "11n.h"
  24
  25
  26 static struct dentry *mwifiex_dfs_dir;
  27
  28 static char *bss_modes[] = {
  29         "Unknown",
  30         "Ad-hoc",
  31         "Managed",
  32         "Auto"
  33 };
  34
  35 /* size/addr for mwifiex_debug_info */
  36 #define item_size(n)            (FIELD_SIZEOF(struct mwifiex_debug_info, n))
  37 #define item_addr(n)            (offsetof(struct mwifiex_debug_info, n))
  38
  39 /* size/addr for struct mwifiex_adapter */
  40 #define adapter_item_size(n)    (FIELD_SIZEOF(struct mwifiex_adapter, n))
  41 #define adapter_item_addr(n)    (offsetof(struct mwifiex_adapter, n))
  42
  43 struct mwifiex_debug_data {
  44         char name[32];          /* variable/array name */
  45         u32 size;               /* size of the variable/array */
  46         size_t addr;            /* address of the variable/array */
  47         int num;                /* number of variables in an array */
  48 };
  49
  50 static struct mwifiex_debug_data items[] = {
  51         {"int_counter", item_size(int_counter),
  52          item_addr(int_counter), 1},
  53         {"wmm_ac_vo", item_size(packets_out[WMM_AC_VO]),
  54          item_addr(packets_out[WMM_AC_VO]), 1},
  55         {"wmm_ac_vi", item_size(packets_out[WMM_AC_VI]),
  56          item_addr(packets_out[WMM_AC_VI]), 1},
  57         {"wmm_ac_be", item_size(packets_out[WMM_AC_BE]),
  58          item_addr(packets_out[WMM_AC_BE]), 1},
  59         {"wmm_ac_bk", item_size(packets_out[WMM_AC_BK]),
  60          item_addr(packets_out[WMM_AC_BK]), 1},
  61         {"max_tx_buf_size", item_size(max_tx_buf_size),
  62          item_addr(max_tx_buf_size), 1},
  63         {"tx_buf_size", item_size(tx_buf_size),
  64          item_addr(tx_buf_size), 1},
  65         {"curr_tx_buf_size", item_size(curr_tx_buf_size),
  66          item_addr(curr_tx_buf_size), 1},
  67         {"ps_mode", item_size(ps_mode),
  68          item_addr(ps_mode), 1},
  69         {"ps_state", item_size(ps_state),
  70          item_addr(ps_state), 1},
  71         {"is_deep_sleep", item_size(is_deep_sleep),
  72          item_addr(is_deep_sleep), 1},
  73         {"wakeup_dev_req", item_size(pm_wakeup_card_req),
  74          item_addr(pm_wakeup_card_req), 1},
  75         {"wakeup_tries", item_size(pm_wakeup_fw_try),
  76          item_addr(pm_wakeup_fw_try), 1},
  77         {"hs_configured", item_size(is_hs_configured),
  78          item_addr(is_hs_configured), 1},
  79         {"hs_activated", item_size(hs_activated),
  80          item_addr(hs_activated), 1},
  81         {"num_tx_timeout", item_size(num_tx_timeout),
  82          item_addr(num_tx_timeout), 1},
  83         {"num_cmd_timeout", item_size(num_cmd_timeout),
  84          item_addr(num_cmd_timeout), 1},
  85         {"timeout_cmd_id", item_size(timeout_cmd_id),
  86          item_addr(timeout_cmd_id), 1},
  87         {"timeout_cmd_act", item_size(timeout_cmd_act),
  88          item_addr(timeout_cmd_act), 1},
  89         {"last_cmd_id", item_size(last_cmd_id),
  90          item_addr(last_cmd_id), DBG_CMD_NUM},
  91         {"last_cmd_act", item_size(last_cmd_act),
  92          item_addr(last_cmd_act), DBG_CMD_NUM},
  93         {"last_cmd_index", item_size(last_cmd_index),
  94          item_addr(last_cmd_index), 1},
  95         {"last_cmd_resp_id", item_size(last_cmd_resp_id),
  96          item_addr(last_cmd_resp_id), DBG_CMD_NUM},
  97         {"last_cmd_resp_index", item_size(last_cmd_resp_index),
  98          item_addr(last_cmd_resp_index), 1},
  99         {"last_event", item_size(last_event),
 100          item_addr(last_event), DBG_CMD_NUM},
 101         {"last_event_index", item_size(last_event_index),
 102          item_addr(last_event_index), 1},
 103         {"num_cmd_h2c_fail", item_size(num_cmd_host_to_card_failure),
 104          item_addr(num_cmd_host_to_card_failure), 1},
 105         {"num_cmd_sleep_cfm_fail",
 106          item_size(num_cmd_sleep_cfm_host_to_card_failure),
 107          item_addr(num_cmd_sleep_cfm_host_to_card_failure), 1},
 108         {"num_tx_h2c_fail", item_size(num_tx_host_to_card_failure),
 109          item_addr(num_tx_host_to_card_failure), 1},
 110         {"num_evt_deauth", item_size(num_event_deauth),
 111          item_addr(num_event_deauth), 1},
 112         {"num_evt_disassoc", item_size(num_event_disassoc),
 113          item_addr(num_event_disassoc), 1},
 114         {"num_evt_link_lost", item_size(num_event_link_lost),
 115          item_addr(num_event_link_lost), 1},
 116         {"num_cmd_deauth", item_size(num_cmd_deauth),
 117          item_addr(num_cmd_deauth), 1},
 118         {"num_cmd_assoc_ok", item_size(num_cmd_assoc_success),
 119          item_addr(num_cmd_assoc_success), 1},
 120         {"num_cmd_assoc_fail", item_size(num_cmd_assoc_failure),
 121          item_addr(num_cmd_assoc_failure), 1},
 122         {"cmd_sent", item_size(cmd_sent),
 123          item_addr(cmd_sent), 1},
 124         {"data_sent", item_size(data_sent),
 125          item_addr(data_sent), 1},
 126         {"cmd_resp_received", item_size(cmd_resp_received),
 127          item_addr(cmd_resp_received), 1},
 128         {"event_received", item_size(event_received),
 129          item_addr(event_received), 1},
 130
 131         /* variables defined in struct mwifiex_adapter */
 132         {"cmd_pending", adapter_item_size(cmd_pending),
 133          adapter_item_addr(cmd_pending), 1},
 134         {"tx_pending", adapter_item_size(tx_pending),
 135          adapter_item_addr(tx_pending), 1},
 136         {"rx_pending", adapter_item_size(rx_pending),
 137          adapter_item_addr(rx_pending), 1},
 138 };
 139
 140 static int num_of_items = ARRAY_SIZE(items);
 141
 142 /*
 143  * Generic proc file open handler.
 144  *
 145  * This function is called every time a file is accessed for read or write.
 146  */
 147 static int
 148 mwifiex_open_generic(struct inode *inode, struct file *file)
 149 {
 150         file->private_data = inode->i_private;
 151         return 0;
 152 }
 153
 154 /*
 155  * Proc info file read handler.
 156  *
 157  * This function is called when the 'info' file is opened for reading.
 158  * It prints the following driver related information -
 159  *      - Driver name
 160  *      - Driver version
 161  *      - Driver extended version
 162  *      - Interface name
 163  *      - BSS mode
 164  *      - Media state (connected or disconnected)
 165  *      - MAC address
 166  *      - Total number of Tx bytes
 167  *      - Total number of Rx bytes
 168  *      - Total number of Tx packets
 169  *      - Total number of Rx packets
 170  *      - Total number of dropped Tx packets
 171  *      - Total number of dropped Rx packets
 172  *      - Total number of corrupted Tx packets
 173  *      - Total number of corrupted Rx packets
 174  *      - Carrier status (on or off)
 175  *      - Tx queue status (started or stopped)
 176  *
 177  * For STA mode drivers, it also prints the following extra -
 178  *      - ESSID
 179  *      - BSSID
 180  *      - Channel
 181  *      - Region code
 182  *      - Multicast count
 183  *      - Multicast addresses
 184  */
 185 static ssize_t
 186 mwifiex_info_read(struct file *file, char __user *ubuf,
 187                   size_t count, loff_t *ppos)
 188 {
 189         struct mwifiex_private *priv =
 190                 (struct mwifiex_private *) file->private_data;
 191         struct net_device *netdev = priv->netdev;
 192         struct netdev_hw_addr *ha;
 193         unsigned long page = get_zeroed_page(GFP_KERNEL);
 194         char *p = (char *) page, fmt[64];
 195         struct mwifiex_bss_info info;
 196         ssize_t ret;
 197         int i = 0;
 198
 199         if (!p)
 200                 return -ENOMEM;
 201
 202         memset(&info, 0, sizeof(info));
 203         ret = mwifiex_get_bss_info(priv, &info);
 204         if (ret)
 205                 goto free_and_exit;
 206
 207         mwifiex_drv_get_driver_version(priv->adapter, fmt, sizeof(fmt) - 1);
 208
 209         if (!priv->version_str[0])
 210                 mwifiex_get_ver_ext(priv);
 211
 212         p += sprintf(p, "driver_name = " "\"mwifiex\"\n");
 213         p += sprintf(p, "driver_version = %s", fmt);
 214         p += sprintf(p, "\nverext = %s", priv->version_str);
 215         p += sprintf(p, "\ninterface_name=\"%s\"\n", netdev->name);
 216         p += sprintf(p, "bss_mode=\"%s\"\n", bss_modes[info.bss_mode]);
 217         p += sprintf(p, "media_state=\"%s\"\n",
 218                      (!priv->media_connected ? "Disconnected" : "Connected"));
 219         p += sprintf(p, "mac_address=\"%pM\"\n", netdev->dev_addr);
 220
 221         if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) {
 222                 p += sprintf(p, "multicast_count=\"%d\"\n",
 223                              netdev_mc_count(netdev));
 224                 p += sprintf(p, "essid=\"%s\"\n", info.ssid.ssid);
 225                 p += sprintf(p, "bssid=\"%pM\"\n", info.bssid);
 226                 p += sprintf(p, "channel=\"%d\"\n", (int) info.bss_chan);
 227                 p += sprintf(p, "region_code = \"%02x\"\n", info.region_code);
 228
 229                 netdev_for_each_mc_addr(ha, netdev)
 230                         p += sprintf(p, "multicast_address[%d]=\"%pM\"\n",
 231                                         i++, ha->addr);
 232         }
 233
 234         p += sprintf(p, "num_tx_bytes = %lu\n", priv->stats.tx_bytes);
 235         p += sprintf(p, "num_rx_bytes = %lu\n", priv->stats.rx_bytes);
 236         p += sprintf(p, "num_tx_pkts = %lu\n", priv->stats.tx_packets);
 237         p += sprintf(p, "num_rx_pkts = %lu\n", priv->stats.rx_packets);
 238         p += sprintf(p, "num_tx_pkts_dropped = %lu\n", priv->stats.tx_dropped);
 239         p += sprintf(p, "num_rx_pkts_dropped = %lu\n", priv->stats.rx_dropped);
 240         p += sprintf(p, "num_tx_pkts_err = %lu\n", priv->stats.tx_errors);
 241         p += sprintf(p, "num_rx_pkts_err = %lu\n", priv->stats.rx_errors);
 242         p += sprintf(p, "carrier %s\n", ((netif_carrier_ok(priv->netdev))
 243                                          ? "on" : "off"));
 244         p += sprintf(p, "tx queue %s\n", ((netif_queue_stopped(priv->netdev))
 245                                           ? "stopped" : "started"));
 246
 247         ret = simple_read_from_buffer(ubuf, count, ppos, (char *) page,
 248                                       (unsigned long) p - page);
 249
 250 free_and_exit:
 251         free_page(page);
 252         return ret;
 253 }
 254
 255 /*
 256  * Proc getlog file read handler.
 257  *
 258  * This function is called when the 'getlog' file is opened for reading
 259  * It prints the following log information -
 260  *      - Number of multicast Tx frames
 261  *      - Number of failed packets
 262  *      - Number of Tx retries
 263  *      - Number of multicast Tx retries
 264  *      - Number of duplicate frames
 265  *      - Number of RTS successes
 266  *      - Number of RTS failures
 267  *      - Number of ACK failures
 268  *      - Number of fragmented Rx frames
 269  *      - Number of multicast Rx frames
 270  *      - Number of FCS errors
 271  *      - Number of Tx frames
 272  *      - WEP ICV error counts
 273  */
 274 static ssize_t
 275 mwifiex_getlog_read(struct file *file, char __user *ubuf,
 276                     size_t count, loff_t *ppos)
 277 {
 278         struct mwifiex_private *priv =
 279                 (struct mwifiex_private *) file->private_data;
 280         unsigned long page = get_zeroed_page(GFP_KERNEL);
 281         char *p = (char *) page;
 282         ssize_t ret;
 283         struct mwifiex_ds_get_stats stats;
 284
 285         if (!p)
 286                 return -ENOMEM;
 287
 288         memset(&stats, 0, sizeof(stats));
 289         ret = mwifiex_get_stats_info(priv, &stats);
 290         if (ret)
 291                 goto free_and_exit;
 292
 293         p += sprintf(p, "\n"
 294                      "mcasttxframe     %u\n"
 295                      "failed           %u\n"
 296                      "retry            %u\n"
 297                      "multiretry       %u\n"
 298                      "framedup         %u\n"
 299                      "rtssuccess       %u\n"
 300                      "rtsfailure       %u\n"
 301                      "ackfailure       %u\n"
 302                      "rxfrag           %u\n"
 303                      "mcastrxframe     %u\n"
 304                      "fcserror         %u\n"
 305                      "txframe          %u\n"
 306                      "wepicverrcnt-1   %u\n"
 307                      "wepicverrcnt-2   %u\n"
 308                      "wepicverrcnt-3   %u\n"
 309                      "wepicverrcnt-4   %u\n",
 310                      stats.mcast_tx_frame,
 311                      stats.failed,
 312                      stats.retry,
 313                      stats.multi_retry,
 314                      stats.frame_dup,
 315                      stats.rts_success,
 316                      stats.rts_failure,
 317                      stats.ack_failure,
 318                      stats.rx_frag,
 319                      stats.mcast_rx_frame,
 320                      stats.fcs_error,
 321                      stats.tx_frame,
 322                      stats.wep_icv_error[0],
 323                      stats.wep_icv_error[1],
 324                      stats.wep_icv_error[2],
 325                      stats.wep_icv_error[3]);
 326
 327
 328         ret = simple_read_from_buffer(ubuf, count, ppos, (char *) page,
 329                                       (unsigned long) p - page);
 330
 331 free_and_exit:
 332         free_page(page);
 333         return ret;
 334 }
 335
 336 static struct mwifiex_debug_info info;
 337
 338 /*
 339  * Proc debug file read handler.
 340  *
 341  * This function is called when the 'debug' file is opened for reading
 342  * It prints the following log information -
 343  *      - Interrupt count
 344  *      - WMM AC VO packets count
 345  *      - WMM AC VI packets count
 346  *      - WMM AC BE packets count
 347  *      - WMM AC BK packets count
 348  *      - Maximum Tx buffer size
 349  *      - Tx buffer size
 350  *      - Current Tx buffer size
 351  *      - Power Save mode
 352  *      - Power Save state
 353  *      - Deep Sleep status
 354  *      - Device wakeup required status
 355  *      - Number of wakeup tries
 356  *      - Host Sleep configured status
 357  *      - Host Sleep activated status
 358  *      - Number of Tx timeouts
 359  *      - Number of command timeouts
 360  *      - Last timed out command ID
 361  *      - Last timed out command action
 362  *      - Last command ID
 363  *      - Last command action
 364  *      - Last command index
 365  *      - Last command response ID
 366  *      - Last command response index
 367  *      - Last event
 368  *      - Last event index
 369  *      - Number of host to card command failures
 370  *      - Number of sleep confirm command failures
 371  *      - Number of host to card data failure
 372  *      - Number of deauthentication events
 373  *      - Number of disassociation events
 374  *      - Number of link lost events
 375  *      - Number of deauthentication commands
 376  *      - Number of association success commands
 377  *      - Number of association failure commands
 378  *      - Number of commands sent
 379  *      - Number of data packets sent
 380  *      - Number of command responses received
 381  *      - Number of events received
 382  *      - Tx BA stream table (TID, RA)
 383  *      - Rx reorder table (TID, TA, Start window, Window size, Buffer)
 384  */
 385 static ssize_t
 386 mwifiex_debug_read(struct file *file, char __user *ubuf,
 387                    size_t count, loff_t *ppos)
 388 {
 389         struct mwifiex_private *priv =
 390                 (struct mwifiex_private *) file->private_data;
 391         struct mwifiex_debug_data *d = &items[0];
 392         unsigned long page = get_zeroed_page(GFP_KERNEL);
 393         char *p = (char *) page;
 394         ssize_t ret;
 395         size_t size, addr;
 396         long val;
 397         int i, j;
 398
 399         if (!p)
 400                 return -ENOMEM;
 401
 402         ret = mwifiex_get_debug_info(priv, &info);
 403         if (ret)
 404                 goto free_and_exit;
 405
 406         for (i = 0; i < num_of_items; i++) {
 407                 p += sprintf(p, "%s=", d[i].name);
 408
 409                 size = d[i].size / d[i].num;
 410
 411                 if (i < (num_of_items - 3))
 412                         addr = d[i].addr + (size_t) &info;
 413                 else /* The last 3 items are struct mwifiex_adapter variables */
 414                         addr = d[i].addr + (size_t) priv->adapter;
 415
 416                 for (j = 0; j < d[i].num; j++) {
 417                         switch (size) {
 418                         case 1:
 419                                 val = *((u8 *) addr);
 420                                 break;
 421                         case 2:
 422                                 val = *((u16 *) addr);
 423                                 break;
 424                         case 4:
 425                                 val = *((u32 *) addr);
 426                                 break;
 427                         case 8:
 428                                 val = *((long long *) addr);
 429                                 break;
 430                         default:
 431                                 val = -1;
 432                                 break;
 433                         }
 434
 435                         p += sprintf(p, "%#lx ", val);
 436                         addr += size;
 437                 }
 438
 439                 p += sprintf(p, "\n");
 440         }
 441
 442         if (info.tx_tbl_num) {
 443                 p += sprintf(p, "Tx BA stream table:\n");
 444                 for (i = 0; i < info.tx_tbl_num; i++)
 445                         p += sprintf(p, "tid = %d, ra = %pM\n",
 446                                      info.tx_tbl[i].tid, info.tx_tbl[i].ra);
 447         }
 448
 449         if (info.rx_tbl_num) {
 450                 p += sprintf(p, "Rx reorder table:\n");
 451                 for (i = 0; i < info.rx_tbl_num; i++) {
 452                         p += sprintf(p, "tid = %d, ta = %pM, "
 453                                      "start_win = %d, "
 454                                      "win_size = %d, buffer: ",
 455                                      info.rx_tbl[i].tid,
 456                                      info.rx_tbl[i].ta,
 457                                      info.rx_tbl[i].start_win,
 458                                      info.rx_tbl[i].win_size);
 459
 460                         for (j = 0; j < info.rx_tbl[i].win_size; j++)
 461                                 p += sprintf(p, "%c ",
 462                                              info.rx_tbl[i].buffer[j] ?
 463                                              '1' : '0');
 464
 465                         p += sprintf(p, "\n");
 466                 }
 467         }
 468
 469         ret = simple_read_from_buffer(ubuf, count, ppos, (char *) page,
 470                                       (unsigned long) p - page);
 471
 472 free_and_exit:
 473         free_page(page);
 474         return ret;
 475 }
 476
 477 static u32 saved_reg_type, saved_reg_offset, saved_reg_value;
 478
 479 /*
 480  * Proc regrdwr file write handler.
 481  *
 482  * This function is called when the 'regrdwr' file is opened for writing
 483  *
 484  * This function can be used to write to a register.
 485  */
 486 static ssize_t
 487 mwifiex_regrdwr_write(struct file *file,
 488                       const char __user *ubuf, size_t count, loff_t *ppos)
 489 {
 490         unsigned long addr = get_zeroed_page(GFP_KERNEL);
 491         char *buf = (char *) addr;
 492         size_t buf_size = min(count, (size_t) (PAGE_SIZE - 1));
 493         int ret;
 494         u32 reg_type = 0, reg_offset = 0, reg_value = UINT_MAX;
 495
 496         if (!buf)
 497                 return -ENOMEM;
 498
 499
 500         if (copy_from_user(buf, ubuf, buf_size)) {
 501                 ret = -EFAULT;
 502                 goto done;
 503         }
 504
 505         sscanf(buf, "%u %x %x", &reg_type, &reg_offset, &reg_value);
 506
 507         if (reg_type == 0 || reg_offset == 0) {
 508                 ret = -EINVAL;
 509                 goto done;
 510         } else {
 511                 saved_reg_type = reg_type;
 512                 saved_reg_offset = reg_offset;
 513                 saved_reg_value = reg_value;
 514                 ret = count;
 515         }
 516 done:
 517         free_page(addr);
 518         return ret;
 519 }
 520
 521 /*
 522  * Proc regrdwr file read handler.
 523  *
 524  * This function is called when the 'regrdwr' file is opened for reading
 525  *
 526  * This function can be used to read from a register.
 527  */
 528 static ssize_t
 529 mwifiex_regrdwr_read(struct file *file, char __user *ubuf,
 530                      size_t count, loff_t *ppos)
 531 {
 532         struct mwifiex_private *priv =
 533                 (struct mwifiex_private *) file->private_data;
 534         unsigned long addr = get_zeroed_page(GFP_KERNEL);
 535         char *buf = (char *) addr;
 536         int pos = 0, ret = 0;
 537         u32 reg_value;
 538
 539         if (!buf)
 540                 return -ENOMEM;
 541
 542         if (!saved_reg_type) {
 543                 /* No command has been given */
 544                 pos += snprintf(buf, PAGE_SIZE, "0");
 545                 goto done;
 546         }
 547         /* Set command has been given */
 548         if (saved_reg_value != UINT_MAX) {
 549                 ret = mwifiex_reg_write(priv, saved_reg_type, saved_reg_offset,
 550                                         saved_reg_value);
 551
 552                 pos += snprintf(buf, PAGE_SIZE, "%u 0x%x 0x%x\n",
 553                                 saved_reg_type, saved_reg_offset,
 554                                 saved_reg_value);
 555
 556                 ret = simple_read_from_buffer(ubuf, count, ppos, buf, pos);
 557
 558                 goto done;
 559         }
 560         /* Get command has been given */
 561         ret = mwifiex_reg_read(priv, saved_reg_type,
 562                                saved_reg_offset, &reg_value);
 563         if (ret) {
 564                 ret = -EINVAL;
 565                 goto done;
 566         }
 567
 568         pos += snprintf(buf, PAGE_SIZE, "%u 0x%x 0x%x\n", saved_reg_type,
 569                         saved_reg_offset, reg_value);
 570
 571         ret = simple_read_from_buffer(ubuf, count, ppos, buf, pos);
 572
 573 done:
 574         free_page(addr);
 575         return ret;
 576 }
 577
 578 static u32 saved_offset = -1, saved_bytes = -1;
 579
 580 /*
 581  * Proc rdeeprom file write handler.
 582  *
 583  * This function is called when the 'rdeeprom' file is opened for writing
 584  *
 585  * This function can be used to write to a RDEEPROM location.
 586  */
 587 static ssize_t
 588 mwifiex_rdeeprom_write(struct file *file,
 589                        const char __user *ubuf, size_t count, loff_t *ppos)
 590 {
 591         unsigned long addr = get_zeroed_page(GFP_KERNEL);
 592         char *buf = (char *) addr;
 593         size_t buf_size = min(count, (size_t) (PAGE_SIZE - 1));
 594         int ret = 0;
 595         int offset = -1, bytes = -1;
 596
 597         if (!buf)
 598                 return -ENOMEM;
 599
 600
 601         if (copy_from_user(buf, ubuf, buf_size)) {
 602                 ret = -EFAULT;
 603                 goto done;
 604         }
 605
 606         sscanf(buf, "%d %d", &offset, &bytes);
 607
 608         if (offset == -1 || bytes == -1) {
 609                 ret = -EINVAL;
 610                 goto done;
 611         } else {
 612                 saved_offset = offset;
 613                 saved_bytes = bytes;
 614                 ret = count;
 615         }
 616 done:
 617         free_page(addr);
 618         return ret;
 619 }
 620
 621 /*
 622  * Proc rdeeprom read write handler.
 623  *
 624  * This function is called when the 'rdeeprom' file is opened for reading
 625  *
 626  * This function can be used to read from a RDEEPROM location.
 627  */
 628 static ssize_t
 629 mwifiex_rdeeprom_read(struct file *file, char __user *ubuf,
 630                       size_t count, loff_t *ppos)
 631 {
 632         struct mwifiex_private *priv =
 633                 (struct mwifiex_private *) file->private_data;
 634         unsigned long addr = get_zeroed_page(GFP_KERNEL);
 635         char *buf = (char *) addr;
 636         int pos = 0, ret = 0, i;
 637         u8 value[MAX_EEPROM_DATA];
 638
 639         if (!buf)
 640                 return -ENOMEM;
 641
 642         if (saved_offset == -1) {
 643                 /* No command has been given */
 644                 pos += snprintf(buf, PAGE_SIZE, "0");
 645                 goto done;
 646         }
 647
 648         /* Get command has been given */
 649         ret = mwifiex_eeprom_read(priv, (u16) saved_offset,
 650                                   (u16) saved_bytes, value);
 651         if (ret) {
 652                 ret = -EINVAL;
 653                 goto done;
 654         }
 655
 656         pos += snprintf(buf, PAGE_SIZE, "%d %d ", saved_offset, saved_bytes);
 657
 658         for (i = 0; i < saved_bytes; i++)
 659                 pos += snprintf(buf + strlen(buf), PAGE_SIZE, "%d ", value[i]);
 660
 661         ret = simple_read_from_buffer(ubuf, count, ppos, buf, pos);
 662
 663 done:
 664         free_page(addr);
 665         return ret;
 666 }
 667
 668
 669 #define MWIFIEX_DFS_ADD_FILE(name) do {                                 \
 670         if (!debugfs_create_file(#name, 0644, priv->dfs_dev_dir,        \
 671                         priv, &mwifiex_dfs_##name##_fops))              \
 672                 return;                                                 \
 673 } while (0);
 674
 675 #define MWIFIEX_DFS_FILE_OPS(name)                                      \
 676 static const struct file_operations mwifiex_dfs_##name##_fops = {       \
 677         .read = mwifiex_##name##_read,                                  \
 678         .write = mwifiex_##name##_write,                                \
 679         .open = mwifiex_open_generic,                                   \
 680 };
 681
 682 #define MWIFIEX_DFS_FILE_READ_OPS(name)                                 \
 683 static const struct file_operations mwifiex_dfs_##name##_fops = {       \
 684         .read = mwifiex_##name##_read,                                  \
 685         .open = mwifiex_open_generic,                                   \
 686 };
 687
 688 #define MWIFIEX_DFS_FILE_WRITE_OPS(name)                                \
 689 static const struct file_operations mwifiex_dfs_##name##_fops = {       \
 690         .write = mwifiex_##name##_write,                                \
 691         .open = mwifiex_open_generic,                                   \
 692 };
 693
 694
 695 MWIFIEX_DFS_FILE_READ_OPS(info);
 696 MWIFIEX_DFS_FILE_READ_OPS(debug);
 697 MWIFIEX_DFS_FILE_READ_OPS(getlog);
 698 MWIFIEX_DFS_FILE_OPS(regrdwr);
 699 MWIFIEX_DFS_FILE_OPS(rdeeprom);
 700
 701 /*
 702  * This function creates the debug FS directory structure and the files.
 703  */
 704 void
 705 mwifiex_dev_debugfs_init(struct mwifiex_private *priv)
 706 {
 707         if (!mwifiex_dfs_dir || !priv)
 708                 return;
 709
 710         priv->dfs_dev_dir = debugfs_create_dir(priv->netdev->name,
 711                                                mwifiex_dfs_dir);
 712
 713         if (!priv->dfs_dev_dir)
 714                 return;
 715
 716         MWIFIEX_DFS_ADD_FILE(info);
 717         MWIFIEX_DFS_ADD_FILE(debug);
 718         MWIFIEX_DFS_ADD_FILE(getlog);
 719         MWIFIEX_DFS_ADD_FILE(regrdwr);
 720         MWIFIEX_DFS_ADD_FILE(rdeeprom);
 721 }
 722
 723 /*
 724  * This function removes the debug FS directory structure and the files.
 725  */
 726 void
 727 mwifiex_dev_debugfs_remove(struct mwifiex_private *priv)
 728 {
 729         if (!priv)
 730                 return;
 731
 732         debugfs_remove_recursive(priv->dfs_dev_dir);
 733 }
 734
 735 /*
 736  * This function creates the top level proc directory.
 737  */
 738 void
 739 mwifiex_debugfs_init(void)
 740 {
 741         if (!mwifiex_dfs_dir)
 742                 mwifiex_dfs_dir = debugfs_create_dir("mwifiex", NULL);
 743 }
 744
 745 /*
 746  * This function removes the top level proc directory.
 747  */
 748 void
 749 mwifiex_debugfs_remove(void)
 750 {
 751         if (mwifiex_dfs_dir)
 752                 debugfs_remove(mwifiex_dfs_dir);
 753 }