rt2x00debug.c

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/*
    Copyright (C) 2004 - 2009 Ivo van Doorn <[email protected]>
    <http://rt2x00.serialmonkey.com>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the
    Free Software Foundation, Inc.,
    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
    Module: rt2x00lib
    Abstract: rt2x00 debugfs specific routines.
 */

#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/uaccess.h>

#include "rt2x00.h"
#include "rt2x00lib.h"
#include "rt2x00dump.h"

#define MAX_LINE_LENGTH 64

struct rt2x00debug_crypto {
    unsigned long success;
    unsigned long icv_error;
    unsigned long mic_error;
    unsigned long key_error;
};

struct rt2x00debug_intf {
    /*
     * Pointer to driver structure where
     * this debugfs entry belongs to.
     */
    struct rt2x00_dev *rt2x00dev;

    /*
     * Reference to the rt2x00debug structure
     * which can be used to communicate with
     * the registers.
     */
    const struct rt2x00debug *debug;

    /*
     * Debugfs entries for:
     * - driver folder
     *   - driver file
     *   - chipset file
     *   - device state flags file
     *   - device capability flags file
     *   - register folder
     *     - csr offset/value files
     *     - eeprom offset/value files
     *     - bbp offset/value files
     *     - rf offset/value files
     *     - rfcsr offset/value files
     *   - queue folder
     *     - frame dump file
     *     - queue stats file
     *     - crypto stats file
     */
    struct dentry *driver_folder;
    struct dentry *driver_entry;
    struct dentry *chipset_entry;
    struct dentry *dev_flags;
    struct dentry *cap_flags;
    struct dentry *register_folder;
    struct dentry *csr_off_entry;
    struct dentry *csr_val_entry;
    struct dentry *eeprom_off_entry;
    struct dentry *eeprom_val_entry;
    struct dentry *bbp_off_entry;
    struct dentry *bbp_val_entry;
    struct dentry *rf_off_entry;
    struct dentry *rf_val_entry;
    struct dentry *rfcsr_off_entry;
    struct dentry *rfcsr_val_entry;
    struct dentry *queue_folder;
    struct dentry *queue_frame_dump_entry;
    struct dentry *queue_stats_entry;
    struct dentry *crypto_stats_entry;

    /*
     * The frame dump file only allows a single reader,
     * so we need to store the current state here.
     */
    unsigned long frame_dump_flags;
#define FRAME_DUMP_FILE_OPEN    1

    /*
     * We queue each frame before dumping it to the user,
     * per read command we will pass a single skb structure
     * so we should be prepared to queue multiple sk buffers
     * before sending it to userspace.
     */
    struct sk_buff_head frame_dump_skbqueue;
    wait_queue_head_t frame_dump_waitqueue;

    /*
     * HW crypto statistics.
     * All statistics are stored separately per cipher type.
     */
    struct rt2x00debug_crypto crypto_stats[CIPHER_MAX];

    /*
     * Driver and chipset files will use a data buffer
     * that has been created in advance. This will simplify
     * the code since we can use the debugfs functions.
     */
    struct debugfs_blob_wrapper driver_blob;
    struct debugfs_blob_wrapper chipset_blob;

    /*
     * Requested offset for each register type.
     */
    unsigned int offset_csr;
    unsigned int offset_eeprom;
    unsigned int offset_bbp;
    unsigned int offset_rf;
    unsigned int offset_rfcsr;
};

void rt2x00debug_update_crypto(struct rt2x00_dev *rt2x00dev,
                   struct rxdone_entry_desc *rxdesc)
{
    struct rt2x00debug_intf *intf = rt2x00dev->debugfs_intf;
    enum cipher cipher = rxdesc->cipher;
    enum rx_crypto status = rxdesc->cipher_status;

    if (cipher == CIPHER_TKIP_NO_MIC)
        cipher = CIPHER_TKIP;
    if (cipher == CIPHER_NONE || cipher >= CIPHER_MAX)
        return;

    /* Remove CIPHER_NONE index */
    cipher--;

    intf->crypto_stats[cipher].success += (status == RX_CRYPTO_SUCCESS);
    intf->crypto_stats[cipher].icv_error += (status == RX_CRYPTO_FAIL_ICV);
    intf->crypto_stats[cipher].mic_error += (status == RX_CRYPTO_FAIL_MIC);
    intf->crypto_stats[cipher].key_error += (status == RX_CRYPTO_FAIL_KEY);
}

void rt2x00debug_dump_frame(struct rt2x00_dev *rt2x00dev,
                enum rt2x00_dump_type type, struct sk_buff *skb)
{
    struct rt2x00debug_intf *intf = rt2x00dev->debugfs_intf;
    struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
    struct sk_buff *skbcopy;
    struct rt2x00dump_hdr *dump_hdr;
    struct timeval timestamp;
    u32 data_len;

    if (likely(!test_bit(FRAME_DUMP_FILE_OPEN, &intf->frame_dump_flags)))
        return;

    do_gettimeofday(&timestamp);

    if (skb_queue_len(&intf->frame_dump_skbqueue) > 20) {
        DEBUG(rt2x00dev, "txrx dump queue length exceeded.\n");
        return;
    }

    data_len = skb->len;
    if (skbdesc->flags & SKBDESC_DESC_IN_SKB)
        data_len -= skbdesc->desc_len;

    skbcopy = alloc_skb(sizeof(*dump_hdr) + skbdesc->desc_len + data_len,
                GFP_ATOMIC);
    if (!skbcopy) {
        DEBUG(rt2x00dev, "Failed to copy skb for dump.\n");
        return;
    }

    dump_hdr = (struct rt2x00dump_hdr *)skb_put(skbcopy, sizeof(*dump_hdr));
    dump_hdr->version = cpu_to_le32(DUMP_HEADER_VERSION);
    dump_hdr->header_length = cpu_to_le32(sizeof(*dump_hdr));
    dump_hdr->desc_length = cpu_to_le32(skbdesc->desc_len);
    dump_hdr->data_length = cpu_to_le32(data_len);
    dump_hdr->chip_rt = cpu_to_le16(rt2x00dev->chip.rt);
    dump_hdr->chip_rf = cpu_to_le16(rt2x00dev->chip.rf);
    dump_hdr->chip_rev = cpu_to_le16(rt2x00dev->chip.rev);
    dump_hdr->type = cpu_to_le16(type);
    dump_hdr->queue_index = skbdesc->entry->queue->qid;
    dump_hdr->entry_index = skbdesc->entry->entry_idx;
    dump_hdr->timestamp_sec = cpu_to_le32(timestamp.tv_sec);
    dump_hdr->timestamp_usec = cpu_to_le32(timestamp.tv_usec);

    if (!(skbdesc->flags & SKBDESC_DESC_IN_SKB))
        memcpy(skb_put(skbcopy, skbdesc->desc_len), skbdesc->desc,
               skbdesc->desc_len);
    memcpy(skb_put(skbcopy, skb->len), skb->data, skb->len);

    skb_queue_tail(&intf->frame_dump_skbqueue, skbcopy);
    wake_up_interruptible(&intf->frame_dump_waitqueue);

    /*
     * Verify that the file has not been closed while we were working.
     */
    if (!test_bit(FRAME_DUMP_FILE_OPEN, &intf->frame_dump_flags))
        skb_queue_purge(&intf->frame_dump_skbqueue);
}
EXPORT_SYMBOL_GPL(rt2x00debug_dump_frame);

static int rt2x00debug_file_open(struct inode *inode, struct file *file)
{
    struct rt2x00debug_intf *intf = inode->i_private;

    file->private_data = inode->i_private;

    if (!try_module_get(intf->debug->owner))
        return -EBUSY;

    return 0;
}

static int rt2x00debug_file_release(struct inode *inode, struct file *file)
{
    struct rt2x00debug_intf *intf = file->private_data;

    module_put(intf->debug->owner);

    return 0;
}

static int rt2x00debug_open_queue_dump(struct inode *inode, struct file *file)
{
    struct rt2x00debug_intf *intf = inode->i_private;
    int retval;

    retval = rt2x00debug_file_open(inode, file);
    if (retval)
        return retval;

    if (test_and_set_bit(FRAME_DUMP_FILE_OPEN, &intf->frame_dump_flags)) {
        rt2x00debug_file_release(inode, file);
        return -EBUSY;
    }

    return 0;
}

static int rt2x00debug_release_queue_dump(struct inode *inode, struct file *file)
{
    struct rt2x00debug_intf *intf = inode->i_private;

    skb_queue_purge(&intf->frame_dump_skbqueue);

    clear_bit(FRAME_DUMP_FILE_OPEN, &intf->frame_dump_flags);

    return rt2x00debug_file_release(inode, file);
}

static ssize_t rt2x00debug_read_queue_dump(struct file *file,
                       char __user *buf,
                       size_t length,
                       loff_t *offset)
{
    struct rt2x00debug_intf *intf = file->private_data;
    struct sk_buff *skb;
    size_t status;
    int retval;

    if (file->f_flags & O_NONBLOCK)
        return -EAGAIN;

    retval =
        wait_event_interruptible(intf->frame_dump_waitqueue,
                     (skb =
                     skb_dequeue(&intf->frame_dump_skbqueue)));
    if (retval)
        return retval;

    status = min((size_t)skb->len, length);
    if (copy_to_user(buf, skb->data, status)) {
        status = -EFAULT;
        goto exit;
    }

    *offset += status;

exit:
    kfree_skb(skb);

    return status;
}

static unsigned int rt2x00debug_poll_queue_dump(struct file *file,
                        poll_table *wait)
{
    struct rt2x00debug_intf *intf = file->private_data;

    poll_wait(file, &intf->frame_dump_waitqueue, wait);

    if (!skb_queue_empty(&intf->frame_dump_skbqueue))
        return POLLOUT | POLLWRNORM;

    return 0;
}

static const struct file_operations rt2x00debug_fop_queue_dump = {
    .owner      = THIS_MODULE,
    .read       = rt2x00debug_read_queue_dump,
    .poll       = rt2x00debug_poll_queue_dump,
    .open       = rt2x00debug_open_queue_dump,
    .release    = rt2x00debug_release_queue_dump,
    .llseek     = default_llseek,
};

static ssize_t rt2x00debug_read_queue_stats(struct file *file,
                        char __user *buf,
                        size_t length,
                        loff_t *offset)
{
    struct rt2x00debug_intf *intf = file->private_data;
    struct data_queue *queue;
    unsigned long irqflags;
    unsigned int lines = 1 + intf->rt2x00dev->data_queues;
    size_t size;
    char *data;
    char *temp;

    if (*offset)
        return 0;

    data = kcalloc(lines, MAX_LINE_LENGTH, GFP_KERNEL);
    if (!data)
        return -ENOMEM;

    temp = data +
        sprintf(data, "qid\tflags\t\tcount\tlimit\tlength\tindex\tdma done\tdone\n");

    queue_for_each(intf->rt2x00dev, queue) {
        spin_lock_irqsave(&queue->index_lock, irqflags);

        temp += sprintf(temp, "%d\t0x%.8x\t%d\t%d\t%d\t%d\t%d\t\t%d\n",
                queue->qid, (unsigned int)queue->flags,
                queue->count, queue->limit, queue->length,
                queue->index[Q_INDEX],
                queue->index[Q_INDEX_DMA_DONE],
                queue->index[Q_INDEX_DONE]);

        spin_unlock_irqrestore(&queue->index_lock, irqflags);
    }

    size = strlen(data);
    size = min(size, length);

    if (copy_to_user(buf, data, size)) {
        kfree(data);
        return -EFAULT;
    }

    kfree(data);

    *offset += size;
    return size;
}

static const struct file_operations rt2x00debug_fop_queue_stats = {
    .owner      = THIS_MODULE,
    .read       = rt2x00debug_read_queue_stats,
    .open       = rt2x00debug_file_open,
    .release    = rt2x00debug_file_release,
    .llseek     = default_llseek,
};

#ifdef CONFIG_RT2X00_LIB_CRYPTO
static ssize_t rt2x00debug_read_crypto_stats(struct file *file,
                         char __user *buf,
                         size_t length,
                         loff_t *offset)
{
    struct rt2x00debug_intf *intf = file->private_data;
    static const char * const name[] = { "WEP64", "WEP128", "TKIP", "AES" };
    char *data;
    char *temp;
    size_t size;
    unsigned int i;

    if (*offset)
        return 0;

    data = kzalloc((1 + CIPHER_MAX) * MAX_LINE_LENGTH, GFP_KERNEL);
    if (!data)
        return -ENOMEM;

    temp = data;
    temp += sprintf(data, "cipher\tsuccess\ticv err\tmic err\tkey err\n");

    for (i = 0; i < CIPHER_MAX; i++) {
        temp += sprintf(temp, "%s\t%lu\t%lu\t%lu\t%lu\n", name[i],
                intf->crypto_stats[i].success,
                intf->crypto_stats[i].icv_error,
                intf->crypto_stats[i].mic_error,
                intf->crypto_stats[i].key_error);
    }

    size = strlen(data);
    size = min(size, length);

    if (copy_to_user(buf, data, size)) {
        kfree(data);
        return -EFAULT;
    }

    kfree(data);

    *offset += size;
    return size;
}

static const struct file_operations rt2x00debug_fop_crypto_stats = {
    .owner      = THIS_MODULE,
    .read       = rt2x00debug_read_crypto_stats,
    .open       = rt2x00debug_file_open,
    .release    = rt2x00debug_file_release,
    .llseek     = default_llseek,
};
#endif

#define RT2X00DEBUGFS_OPS_READ(__name, __format, __type)    \
static ssize_t rt2x00debug_read_##__name(struct file *file, \
                     char __user *buf,  \
                     size_t length,     \
                     loff_t *offset)    \
{                               \
    struct rt2x00debug_intf *intf = file->private_data; \
    const struct rt2x00debug *debug = intf->debug;      \
    char line[16];                      \
    size_t size;                        \
    unsigned int index = intf->offset_##__name;     \
    __type value;                       \
                                \
    if (*offset)                        \
        return 0;                   \
                                \
    if (index >= debug->__name.word_count)          \
        return -EINVAL;                 \
                                \
    index += (debug->__name.word_base /         \
          debug->__name.word_size);         \
                                \
    if (debug->__name.flags & RT2X00DEBUGFS_OFFSET)     \
        index *= debug->__name.word_size;       \
                                \
    debug->__name.read(intf->rt2x00dev, index, &value); \
                                \
    size = sprintf(line, __format, value);          \
                                \
    if (copy_to_user(buf, line, size))          \
        return -EFAULT;                 \
                                \
    *offset += size;                    \
    return size;                        \
}

#define RT2X00DEBUGFS_OPS_WRITE(__name, __type)         \
static ssize_t rt2x00debug_write_##__name(struct file *file,    \
                      const char __user *buf,\
                      size_t length,    \
                      loff_t *offset)   \
{                               \
    struct rt2x00debug_intf *intf = file->private_data; \
    const struct rt2x00debug *debug = intf->debug;      \
    char line[16];                      \
    size_t size;                        \
    unsigned int index = intf->offset_##__name;     \
    __type value;                       \
                                \
    if (*offset)                        \
        return 0;                   \
                                \
    if (index >= debug->__name.word_count)          \
        return -EINVAL;                 \
                                \
    if (length > sizeof(line))              \
        return -EINVAL;                 \
                                \
    if (copy_from_user(line, buf, length))          \
        return -EFAULT;                 \
                                \
    size = strlen(line);                    \
    value = simple_strtoul(line, NULL, 0);          \
                                \
    index += (debug->__name.word_base /         \
          debug->__name.word_size);         \
                                \
    if (debug->__name.flags & RT2X00DEBUGFS_OFFSET)     \
        index *= debug->__name.word_size;       \
                                \
    debug->__name.write(intf->rt2x00dev, index, value); \
                                \
    *offset += size;                    \
    return size;                        \
}

#define RT2X00DEBUGFS_OPS(__name, __format, __type)     \
RT2X00DEBUGFS_OPS_READ(__name, __format, __type);       \
RT2X00DEBUGFS_OPS_WRITE(__name, __type);            \
                                \
static const struct file_operations rt2x00debug_fop_##__name = {\
    .owner      = THIS_MODULE,              \
    .read       = rt2x00debug_read_##__name,        \
    .write      = rt2x00debug_write_##__name,       \
    .open       = rt2x00debug_file_open,        \
    .release    = rt2x00debug_file_release,     \
    .llseek     = generic_file_llseek,          \
};

RT2X00DEBUGFS_OPS(csr, "0x%.8x\n", u32);
RT2X00DEBUGFS_OPS(eeprom, "0x%.4x\n", u16);
RT2X00DEBUGFS_OPS(bbp, "0x%.2x\n", u8);
RT2X00DEBUGFS_OPS(rf, "0x%.8x\n", u32);
RT2X00DEBUGFS_OPS(rfcsr, "0x%.2x\n", u8);

static ssize_t rt2x00debug_read_dev_flags(struct file *file,
                      char __user *buf,
                      size_t length,
                      loff_t *offset)
{
    struct rt2x00debug_intf *intf = file->private_data;
    char line[16];
    size_t size;

    if (*offset)
        return 0;

    size = sprintf(line, "0x%.8x\n", (unsigned int)intf->rt2x00dev->flags);

    if (copy_to_user(buf, line, size))
        return -EFAULT;

    *offset += size;
    return size;
}

static const struct file_operations rt2x00debug_fop_dev_flags = {
    .owner      = THIS_MODULE,
    .read       = rt2x00debug_read_dev_flags,
    .open       = rt2x00debug_file_open,
    .release    = rt2x00debug_file_release,
    .llseek     = default_llseek,
};

static ssize_t rt2x00debug_read_cap_flags(struct file *file,
                      char __user *buf,
                      size_t length,
                      loff_t *offset)
{
    struct rt2x00debug_intf *intf = file->private_data;
    char line[16];
    size_t size;

    if (*offset)
        return 0;

    size = sprintf(line, "0x%.8x\n", (unsigned int)intf->rt2x00dev->cap_flags);

    if (copy_to_user(buf, line, size))
        return -EFAULT;

    *offset += size;
    return size;
}

static const struct file_operations rt2x00debug_fop_cap_flags = {
    .owner      = THIS_MODULE,
    .read       = rt2x00debug_read_cap_flags,
    .open       = rt2x00debug_file_open,
    .release    = rt2x00debug_file_release,
    .llseek     = default_llseek,
};

static struct dentry *rt2x00debug_create_file_driver(const char *name,
                             struct rt2x00debug_intf
                             *intf,
                             struct debugfs_blob_wrapper
                             *blob)
{
    char *data;

    data = kzalloc(3 * MAX_LINE_LENGTH, GFP_KERNEL);
    if (!data)
        return NULL;

    blob->data = data;
    data += sprintf(data, "driver:\t%s\n", intf->rt2x00dev->ops->name);
    data += sprintf(data, "version:\t%s\n", DRV_VERSION);
    blob->size = strlen(blob->data);

    return debugfs_create_blob(name, S_IRUSR, intf->driver_folder, blob);
}

static struct dentry *rt2x00debug_create_file_chipset(const char *name,
                              struct rt2x00debug_intf
                              *intf,
                              struct
                              debugfs_blob_wrapper
                              *blob)
{
    const struct rt2x00debug *debug = intf->debug;
    char *data;

    data = kzalloc(9 * MAX_LINE_LENGTH, GFP_KERNEL);
    if (!data)
        return NULL;

    blob->data = data;
    data += sprintf(data, "rt chip:\t%04x\n", intf->rt2x00dev->chip.rt);
    data += sprintf(data, "rf chip:\t%04x\n", intf->rt2x00dev->chip.rf);
    data += sprintf(data, "revision:\t%04x\n", intf->rt2x00dev->chip.rev);
    data += sprintf(data, "\n");
    data += sprintf(data, "register\tbase\twords\twordsize\n");
#define RT2X00DEBUGFS_SPRINTF_REGISTER(__name)          \
{                               \
    if(debug->__name.read)                  \
        data += sprintf(data, __stringify(__name)   \
                "\t%d\t%d\t%d\n",       \
                debug->__name.word_base,    \
                debug->__name.word_count,   \
                debug->__name.word_size);   \
}
    RT2X00DEBUGFS_SPRINTF_REGISTER(csr);
    RT2X00DEBUGFS_SPRINTF_REGISTER(eeprom);
    RT2X00DEBUGFS_SPRINTF_REGISTER(bbp);
    RT2X00DEBUGFS_SPRINTF_REGISTER(rf);
    RT2X00DEBUGFS_SPRINTF_REGISTER(rfcsr);
#undef RT2X00DEBUGFS_SPRINTF_REGISTER

    blob->size = strlen(blob->data);

    return debugfs_create_blob(name, S_IRUSR, intf->driver_folder, blob);
}

void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
{
    const struct rt2x00debug *debug = rt2x00dev->ops->debugfs;
    struct rt2x00debug_intf *intf;

    intf = kzalloc(sizeof(struct rt2x00debug_intf), GFP_KERNEL);
    if (!intf) {
        ERROR(rt2x00dev, "Failed to allocate debug handler.\n");
        return;
    }

    intf->debug = debug;
    intf->rt2x00dev = rt2x00dev;
    rt2x00dev->debugfs_intf = intf;

    intf->driver_folder =
        debugfs_create_dir(intf->rt2x00dev->ops->name,
                   rt2x00dev->hw->wiphy->debugfsdir);
    if (IS_ERR(intf->driver_folder) || !intf->driver_folder)
        goto exit;

    intf->driver_entry =
        rt2x00debug_create_file_driver("driver", intf, &intf->driver_blob);
    if (IS_ERR(intf->driver_entry) || !intf->driver_entry)
        goto exit;

    intf->chipset_entry =
        rt2x00debug_create_file_chipset("chipset",
                        intf, &intf->chipset_blob);
    if (IS_ERR(intf->chipset_entry) || !intf->chipset_entry)
        goto exit;

    intf->dev_flags = debugfs_create_file("dev_flags", S_IRUSR,
                          intf->driver_folder, intf,
                          &rt2x00debug_fop_dev_flags);
    if (IS_ERR(intf->dev_flags) || !intf->dev_flags)
        goto exit;

    intf->cap_flags = debugfs_create_file("cap_flags", S_IRUSR,
                          intf->driver_folder, intf,
                          &rt2x00debug_fop_cap_flags);
    if (IS_ERR(intf->cap_flags) || !intf->cap_flags)
        goto exit;

    intf->register_folder =
        debugfs_create_dir("register", intf->driver_folder);
    if (IS_ERR(intf->register_folder) || !intf->register_folder)
        goto exit;

#define RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(__intf, __name)         \
({                                      \
    if(debug->__name.read) {                        \
        (__intf)->__name##_off_entry =                  \
        debugfs_create_u32(__stringify(__name) "_offset",       \
                       S_IRUSR | S_IWUSR,           \
                       (__intf)->register_folder,       \
                       &(__intf)->offset_##__name);     \
        if (IS_ERR((__intf)->__name##_off_entry)            \
                || !(__intf)->__name##_off_entry)       \
            goto exit;                      \
                                        \
        (__intf)->__name##_val_entry =                  \
        debugfs_create_file(__stringify(__name) "_value",       \
                    S_IRUSR | S_IWUSR,          \
                    (__intf)->register_folder,      \
                    (__intf), &rt2x00debug_fop_##__name);   \
        if (IS_ERR((__intf)->__name##_val_entry)            \
                || !(__intf)->__name##_val_entry)       \
            goto exit;                      \
    }                                   \
})

    RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(intf, csr);
    RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(intf, eeprom);
    RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(intf, bbp);
    RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(intf, rf);
    RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(intf, rfcsr);

#undef RT2X00DEBUGFS_CREATE_REGISTER_ENTRY

    intf->queue_folder =
        debugfs_create_dir("queue", intf->driver_folder);
    if (IS_ERR(intf->queue_folder) || !intf->queue_folder)
        goto exit;

    intf->queue_frame_dump_entry =
        debugfs_create_file("dump", S_IRUSR, intf->queue_folder,
                intf, &rt2x00debug_fop_queue_dump);
    if (IS_ERR(intf->queue_frame_dump_entry)
        || !intf->queue_frame_dump_entry)
        goto exit;

    skb_queue_head_init(&intf->frame_dump_skbqueue);
    init_waitqueue_head(&intf->frame_dump_waitqueue);

    intf->queue_stats_entry =
        debugfs_create_file("queue", S_IRUSR, intf->queue_folder,
                intf, &rt2x00debug_fop_queue_stats);

#ifdef CONFIG_RT2X00_LIB_CRYPTO
    if (test_bit(CAPABILITY_HW_CRYPTO, &rt2x00dev->cap_flags))
        intf->crypto_stats_entry =
            debugfs_create_file("crypto", S_IRUGO, intf->queue_folder,
                    intf, &rt2x00debug_fop_crypto_stats);
#endif

    return;

exit:
    rt2x00debug_deregister(rt2x00dev);
    ERROR(rt2x00dev, "Failed to register debug handler.\n");
}

void rt2x00debug_deregister(struct rt2x00_dev *rt2x00dev)
{
    struct rt2x00debug_intf *intf = rt2x00dev->debugfs_intf;

    if (unlikely(!intf))
        return;

    skb_queue_purge(&intf->frame_dump_skbqueue);

#ifdef CONFIG_RT2X00_LIB_CRYPTO
    debugfs_remove(intf->crypto_stats_entry);
#endif
    debugfs_remove(intf->queue_stats_entry);
    debugfs_remove(intf->queue_frame_dump_entry);
    debugfs_remove(intf->queue_folder);
    debugfs_remove(intf->rfcsr_val_entry);
    debugfs_remove(intf->rfcsr_off_entry);
    debugfs_remove(intf->rf_val_entry);
    debugfs_remove(intf->rf_off_entry);
    debugfs_remove(intf->bbp_val_entry);
    debugfs_remove(intf->bbp_off_entry);
    debugfs_remove(intf->eeprom_val_entry);
    debugfs_remove(intf->eeprom_off_entry);
    debugfs_remove(intf->csr_val_entry);
    debugfs_remove(intf->csr_off_entry);
    debugfs_remove(intf->register_folder);
    debugfs_remove(intf->dev_flags);
    debugfs_remove(intf->cap_flags);
    debugfs_remove(intf->chipset_entry);
    debugfs_remove(intf->driver_entry);
    debugfs_remove(intf->driver_folder);
    kfree(intf->chipset_blob.data);
    kfree(intf->driver_blob.data);
    kfree(intf);

    rt2x00dev->debugfs_intf = NULL;
}