debugfs.c

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#include <linux/dcache.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/hardirq.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/export.h>

#include "decl.h"
#include "cmd.h"
#include "debugfs.h"

static struct dentry *lbs_dir;
static char *szStates[] = {
    "Connected",
    "Disconnected"
};

#ifdef PROC_DEBUG
static void lbs_debug_init(struct lbs_private *priv);
#endif

static ssize_t write_file_dummy(struct file *file, const char __user *buf,
                                size_t count, loff_t *ppos)
{
        return -EINVAL;
}

static const size_t len = PAGE_SIZE;

static ssize_t lbs_dev_info(struct file *file, char __user *userbuf,
                  size_t count, loff_t *ppos)
{
    struct lbs_private *priv = file->private_data;
    size_t pos = 0;
    unsigned long addr = get_zeroed_page(GFP_KERNEL);
    char *buf = (char *)addr;
    ssize_t res;
    if (!buf)
        return -ENOMEM;

    pos += snprintf(buf+pos, len-pos, "state = %s\n",
                szStates[priv->connect_status]);
    pos += snprintf(buf+pos, len-pos, "region_code = %02x\n",
                (u32) priv->regioncode);

    res = simple_read_from_buffer(userbuf, count, ppos, buf, pos);

    free_page(addr);
    return res;
}

static ssize_t lbs_sleepparams_write(struct file *file,
                const char __user *user_buf, size_t count,
                loff_t *ppos)
{
    struct lbs_private *priv = file->private_data;
    ssize_t buf_size, ret;
    struct sleep_params sp;
    int p1, p2, p3, p4, p5, p6;
    unsigned long addr = get_zeroed_page(GFP_KERNEL);
    char *buf = (char *)addr;
    if (!buf)
        return -ENOMEM;

    buf_size = min(count, len - 1);
    if (copy_from_user(buf, user_buf, buf_size)) {
        ret = -EFAULT;
        goto out_unlock;
    }
    ret = sscanf(buf, "%d %d %d %d %d %d", &p1, &p2, &p3, &p4, &p5, &p6);
    if (ret != 6) {
        ret = -EINVAL;
        goto out_unlock;
    }
    sp.sp_error = p1;
    sp.sp_offset = p2;
    sp.sp_stabletime = p3;
    sp.sp_calcontrol = p4;
    sp.sp_extsleepclk = p5;
    sp.sp_reserved = p6;

    ret = lbs_cmd_802_11_sleep_params(priv, CMD_ACT_SET, &sp);
    if (!ret)
        ret = count;
    else if (ret > 0)
        ret = -EINVAL;

out_unlock:
    free_page(addr);
    return ret;
}

static ssize_t lbs_sleepparams_read(struct file *file, char __user *userbuf,
                  size_t count, loff_t *ppos)
{
    struct lbs_private *priv = file->private_data;
    ssize_t ret;
    size_t pos = 0;
    struct sleep_params sp;
    unsigned long addr = get_zeroed_page(GFP_KERNEL);
    char *buf = (char *)addr;
    if (!buf)
        return -ENOMEM;

    ret = lbs_cmd_802_11_sleep_params(priv, CMD_ACT_GET, &sp);
    if (ret)
        goto out_unlock;

    pos += snprintf(buf, len, "%d %d %d %d %d %d\n", sp.sp_error,
            sp.sp_offset, sp.sp_stabletime,
            sp.sp_calcontrol, sp.sp_extsleepclk,
            sp.sp_reserved);

    ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);

out_unlock:
    free_page(addr);
    return ret;
}

static ssize_t lbs_host_sleep_write(struct file *file,
                const char __user *user_buf, size_t count,
                loff_t *ppos)
{
    struct lbs_private *priv = file->private_data;
    ssize_t buf_size, ret;
    int host_sleep;
    unsigned long addr = get_zeroed_page(GFP_KERNEL);
    char *buf = (char *)addr;
    if (!buf)
        return -ENOMEM;

    buf_size = min(count, len - 1);
    if (copy_from_user(buf, user_buf, buf_size)) {
        ret = -EFAULT;
        goto out_unlock;
    }
    ret = sscanf(buf, "%d", &host_sleep);
    if (ret != 1) {
        ret = -EINVAL;
        goto out_unlock;
    }

    if (host_sleep == 0)
        ret = lbs_set_host_sleep(priv, 0);
    else if (host_sleep == 1) {
        if (priv->wol_criteria == EHS_REMOVE_WAKEUP) {
            netdev_info(priv->dev,
                    "wake parameters not configured\n");
            ret = -EINVAL;
            goto out_unlock;
        }
        ret = lbs_set_host_sleep(priv, 1);
    } else {
        netdev_err(priv->dev, "invalid option\n");
        ret = -EINVAL;
    }

    if (!ret)
        ret = count;

out_unlock:
    free_page(addr);
    return ret;
}

static ssize_t lbs_host_sleep_read(struct file *file, char __user *userbuf,
                  size_t count, loff_t *ppos)
{
    struct lbs_private *priv = file->private_data;
    ssize_t ret;
    size_t pos = 0;
    unsigned long addr = get_zeroed_page(GFP_KERNEL);
    char *buf = (char *)addr;
    if (!buf)
        return -ENOMEM;

    pos += snprintf(buf, len, "%d\n", priv->is_host_sleep_activated);

    ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);

    free_page(addr);
    return ret;
}

/*
 * When calling CMD_802_11_SUBSCRIBE_EVENT with CMD_ACT_GET, me might
 * get a bunch of vendor-specific TLVs (a.k.a. IEs) back from the
 * firmware. Here's an example:
 *  04 01 02 00 00 00 05 01 02 00 00 00 06 01 02 00
 *  00 00 07 01 02 00 3c 00 00 00 00 00 00 00 03 03
 *  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 *
 * The 04 01 is the TLV type (here TLV_TYPE_RSSI_LOW), 02 00 is the length,
 * 00 00 are the data bytes of this TLV. For this TLV, their meaning is
 * defined in mrvlietypes_thresholds
 *
 * This function searches in this TLV data chunk for a given TLV type
 * and returns a pointer to the first data byte of the TLV, or to NULL
 * if the TLV hasn't been found.
 */
static void *lbs_tlv_find(uint16_t tlv_type, const uint8_t *tlv, uint16_t size)
{
    struct mrvl_ie_header *tlv_h;
    uint16_t length;
    ssize_t pos = 0;

    while (pos < size) {
        tlv_h = (struct mrvl_ie_header *) tlv;
        if (!tlv_h->len)
            return NULL;
        if (tlv_h->type == cpu_to_le16(tlv_type))
            return tlv_h;
        length = le16_to_cpu(tlv_h->len) + sizeof(*tlv_h);
        pos += length;
        tlv += length;
    }
    return NULL;
}


static ssize_t lbs_threshold_read(uint16_t tlv_type, uint16_t event_mask,
                  struct file *file, char __user *userbuf,
                  size_t count, loff_t *ppos)
{
    struct cmd_ds_802_11_subscribe_event *subscribed;
    struct mrvl_ie_thresholds *got;
    struct lbs_private *priv = file->private_data;
    ssize_t ret = 0;
    size_t pos = 0;
    char *buf;
    u8 value;
    u8 freq;
    int events = 0;

    buf = (char *)get_zeroed_page(GFP_KERNEL);
    if (!buf)
        return -ENOMEM;

    subscribed = kzalloc(sizeof(*subscribed), GFP_KERNEL);
    if (!subscribed) {
        ret = -ENOMEM;
        goto out_page;
    }

    subscribed->hdr.size = cpu_to_le16(sizeof(*subscribed));
    subscribed->action = cpu_to_le16(CMD_ACT_GET);

    ret = lbs_cmd_with_response(priv, CMD_802_11_SUBSCRIBE_EVENT, subscribed);
    if (ret)
        goto out_cmd;

    got = lbs_tlv_find(tlv_type, subscribed->tlv, sizeof(subscribed->tlv));
    if (got) {
        value = got->value;
        freq  = got->freq;
        events = le16_to_cpu(subscribed->events);

        pos += snprintf(buf, len, "%d %d %d\n", value, freq,
                !!(events & event_mask));
    }

    ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);

 out_cmd:
    kfree(subscribed);

 out_page:
    free_page((unsigned long)buf);
    return ret;
}


static ssize_t lbs_threshold_write(uint16_t tlv_type, uint16_t event_mask,
                   struct file *file,
                   const char __user *userbuf, size_t count,
                   loff_t *ppos)
{
    struct cmd_ds_802_11_subscribe_event *events;
    struct mrvl_ie_thresholds *tlv;
    struct lbs_private *priv = file->private_data;
    ssize_t buf_size;
    int value, freq, new_mask;
    uint16_t curr_mask;
    char *buf;
    int ret;

    buf = (char *)get_zeroed_page(GFP_KERNEL);
    if (!buf)
        return -ENOMEM;

    buf_size = min(count, len - 1);
    if (copy_from_user(buf, userbuf, buf_size)) {
        ret = -EFAULT;
        goto out_page;
    }
    ret = sscanf(buf, "%d %d %d", &value, &freq, &new_mask);
    if (ret != 3) {
        ret = -EINVAL;
        goto out_page;
    }
    events = kzalloc(sizeof(*events), GFP_KERNEL);
    if (!events) {
        ret = -ENOMEM;
        goto out_page;
    }

    events->hdr.size = cpu_to_le16(sizeof(*events));
    events->action = cpu_to_le16(CMD_ACT_GET);

    ret = lbs_cmd_with_response(priv, CMD_802_11_SUBSCRIBE_EVENT, events);
    if (ret)
        goto out_events;

    curr_mask = le16_to_cpu(events->events);

    if (new_mask)
        new_mask = curr_mask | event_mask;
    else
        new_mask = curr_mask & ~event_mask;

    /* Now everything is set and we can send stuff down to the firmware */

    tlv = (void *)events->tlv;

    events->action = cpu_to_le16(CMD_ACT_SET);
    events->events = cpu_to_le16(new_mask);
    tlv->header.type = cpu_to_le16(tlv_type);
    tlv->header.len = cpu_to_le16(sizeof(*tlv) - sizeof(tlv->header));
    tlv->value = value;
    if (tlv_type != TLV_TYPE_BCNMISS)
        tlv->freq = freq;

    /* The command header, the action, the event mask, and one TLV */
    events->hdr.size = cpu_to_le16(sizeof(events->hdr) + 4 + sizeof(*tlv));

    ret = lbs_cmd_with_response(priv, CMD_802_11_SUBSCRIBE_EVENT, events);

    if (!ret)
        ret = count;
 out_events:
    kfree(events);
 out_page:
    free_page((unsigned long)buf);
    return ret;
}


static ssize_t lbs_lowrssi_read(struct file *file, char __user *userbuf,
                size_t count, loff_t *ppos)
{
    return lbs_threshold_read(TLV_TYPE_RSSI_LOW, CMD_SUBSCRIBE_RSSI_LOW,
                  file, userbuf, count, ppos);
}


static ssize_t lbs_lowrssi_write(struct file *file, const char __user *userbuf,
                 size_t count, loff_t *ppos)
{
    return lbs_threshold_write(TLV_TYPE_RSSI_LOW, CMD_SUBSCRIBE_RSSI_LOW,
                   file, userbuf, count, ppos);
}


static ssize_t lbs_lowsnr_read(struct file *file, char __user *userbuf,
                   size_t count, loff_t *ppos)
{
    return lbs_threshold_read(TLV_TYPE_SNR_LOW, CMD_SUBSCRIBE_SNR_LOW,
                  file, userbuf, count, ppos);
}


static ssize_t lbs_lowsnr_write(struct file *file, const char __user *userbuf,
                size_t count, loff_t *ppos)
{
    return lbs_threshold_write(TLV_TYPE_SNR_LOW, CMD_SUBSCRIBE_SNR_LOW,
                   file, userbuf, count, ppos);
}


static ssize_t lbs_failcount_read(struct file *file, char __user *userbuf,
                  size_t count, loff_t *ppos)
{
    return lbs_threshold_read(TLV_TYPE_FAILCOUNT, CMD_SUBSCRIBE_FAILCOUNT,
                  file, userbuf, count, ppos);
}


static ssize_t lbs_failcount_write(struct file *file, const char __user *userbuf,
                   size_t count, loff_t *ppos)
{
    return lbs_threshold_write(TLV_TYPE_FAILCOUNT, CMD_SUBSCRIBE_FAILCOUNT,
                   file, userbuf, count, ppos);
}


static ssize_t lbs_highrssi_read(struct file *file, char __user *userbuf,
                 size_t count, loff_t *ppos)
{
    return lbs_threshold_read(TLV_TYPE_RSSI_HIGH, CMD_SUBSCRIBE_RSSI_HIGH,
                  file, userbuf, count, ppos);
}


static ssize_t lbs_highrssi_write(struct file *file, const char __user *userbuf,
                  size_t count, loff_t *ppos)
{
    return lbs_threshold_write(TLV_TYPE_RSSI_HIGH, CMD_SUBSCRIBE_RSSI_HIGH,
                   file, userbuf, count, ppos);
}


static ssize_t lbs_highsnr_read(struct file *file, char __user *userbuf,
                size_t count, loff_t *ppos)
{
    return lbs_threshold_read(TLV_TYPE_SNR_HIGH, CMD_SUBSCRIBE_SNR_HIGH,
                  file, userbuf, count, ppos);
}


static ssize_t lbs_highsnr_write(struct file *file, const char __user *userbuf,
                 size_t count, loff_t *ppos)
{
    return lbs_threshold_write(TLV_TYPE_SNR_HIGH, CMD_SUBSCRIBE_SNR_HIGH,
                   file, userbuf, count, ppos);
}

static ssize_t lbs_bcnmiss_read(struct file *file, char __user *userbuf,
                size_t count, loff_t *ppos)
{
    return lbs_threshold_read(TLV_TYPE_BCNMISS, CMD_SUBSCRIBE_BCNMISS,
                  file, userbuf, count, ppos);
}


static ssize_t lbs_bcnmiss_write(struct file *file, const char __user *userbuf,
                 size_t count, loff_t *ppos)
{
    return lbs_threshold_write(TLV_TYPE_BCNMISS, CMD_SUBSCRIBE_BCNMISS,
                   file, userbuf, count, ppos);
}


static ssize_t lbs_rdmac_read(struct file *file, char __user *userbuf,
                  size_t count, loff_t *ppos)
{
    struct lbs_private *priv = file->private_data;
    ssize_t pos = 0;
    int ret;
    unsigned long addr = get_zeroed_page(GFP_KERNEL);
    char *buf = (char *)addr;
    u32 val = 0;

    if (!buf)
        return -ENOMEM;

    ret = lbs_get_reg(priv, CMD_MAC_REG_ACCESS, priv->mac_offset, &val);
    mdelay(10);
    if (!ret) {
        pos = snprintf(buf, len, "MAC[0x%x] = 0x%08x\n",
                priv->mac_offset, val);
        ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
    }
    free_page(addr);
    return ret;
}

static ssize_t lbs_rdmac_write(struct file *file,
                    const char __user *userbuf,
                    size_t count, loff_t *ppos)
{
    struct lbs_private *priv = file->private_data;
    ssize_t res, buf_size;
    unsigned long addr = get_zeroed_page(GFP_KERNEL);
    char *buf = (char *)addr;
    if (!buf)
        return -ENOMEM;

    buf_size = min(count, len - 1);
    if (copy_from_user(buf, userbuf, buf_size)) {
        res = -EFAULT;
        goto out_unlock;
    }
    priv->mac_offset = simple_strtoul(buf, NULL, 16);
    res = count;
out_unlock:
    free_page(addr);
    return res;
}

static ssize_t lbs_wrmac_write(struct file *file,
                    const char __user *userbuf,
                    size_t count, loff_t *ppos)
{

    struct lbs_private *priv = file->private_data;
    ssize_t res, buf_size;
    u32 offset, value;
    unsigned long addr = get_zeroed_page(GFP_KERNEL);
    char *buf = (char *)addr;
    if (!buf)
        return -ENOMEM;

    buf_size = min(count, len - 1);
    if (copy_from_user(buf, userbuf, buf_size)) {
        res = -EFAULT;
        goto out_unlock;
    }
    res = sscanf(buf, "%x %x", &offset, &value);
    if (res != 2) {
        res = -EFAULT;
        goto out_unlock;
    }

    res = lbs_set_reg(priv, CMD_MAC_REG_ACCESS, offset, value);
    mdelay(10);

    if (!res)
        res = count;
out_unlock:
    free_page(addr);
    return res;
}

static ssize_t lbs_rdbbp_read(struct file *file, char __user *userbuf,
                  size_t count, loff_t *ppos)
{
    struct lbs_private *priv = file->private_data;
    ssize_t pos = 0;
    int ret;
    unsigned long addr = get_zeroed_page(GFP_KERNEL);
    char *buf = (char *)addr;
    u32 val;

    if (!buf)
        return -ENOMEM;

    ret = lbs_get_reg(priv, CMD_BBP_REG_ACCESS, priv->bbp_offset, &val);
    mdelay(10);
    if (!ret) {
        pos = snprintf(buf, len, "BBP[0x%x] = 0x%08x\n",
                priv->bbp_offset, val);
        ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
    }
    free_page(addr);

    return ret;
}

static ssize_t lbs_rdbbp_write(struct file *file,
                    const char __user *userbuf,
                    size_t count, loff_t *ppos)
{
    struct lbs_private *priv = file->private_data;
    ssize_t res, buf_size;
    unsigned long addr = get_zeroed_page(GFP_KERNEL);
    char *buf = (char *)addr;
    if (!buf)
        return -ENOMEM;

    buf_size = min(count, len - 1);
    if (copy_from_user(buf, userbuf, buf_size)) {
        res = -EFAULT;
        goto out_unlock;
    }
    priv->bbp_offset = simple_strtoul(buf, NULL, 16);
    res = count;
out_unlock:
    free_page(addr);
    return res;
}

static ssize_t lbs_wrbbp_write(struct file *file,
                    const char __user *userbuf,
                    size_t count, loff_t *ppos)
{

    struct lbs_private *priv = file->private_data;
    ssize_t res, buf_size;
    u32 offset, value;
    unsigned long addr = get_zeroed_page(GFP_KERNEL);
    char *buf = (char *)addr;
    if (!buf)
        return -ENOMEM;

    buf_size = min(count, len - 1);
    if (copy_from_user(buf, userbuf, buf_size)) {
        res = -EFAULT;
        goto out_unlock;
    }
    res = sscanf(buf, "%x %x", &offset, &value);
    if (res != 2) {
        res = -EFAULT;
        goto out_unlock;
    }

    res = lbs_set_reg(priv, CMD_BBP_REG_ACCESS, offset, value);
    mdelay(10);

    if (!res)
        res = count;
out_unlock:
    free_page(addr);
    return res;
}

static ssize_t lbs_rdrf_read(struct file *file, char __user *userbuf,
                  size_t count, loff_t *ppos)
{
    struct lbs_private *priv = file->private_data;
    ssize_t pos = 0;
    int ret;
    unsigned long addr = get_zeroed_page(GFP_KERNEL);
    char *buf = (char *)addr;
    u32 val;

    if (!buf)
        return -ENOMEM;

    ret = lbs_get_reg(priv, CMD_RF_REG_ACCESS, priv->rf_offset, &val);
    mdelay(10);
    if (!ret) {
        pos = snprintf(buf, len, "RF[0x%x] = 0x%08x\n",
                priv->rf_offset, val);
        ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
    }
    free_page(addr);

    return ret;
}

static ssize_t lbs_rdrf_write(struct file *file,
                    const char __user *userbuf,
                    size_t count, loff_t *ppos)
{
    struct lbs_private *priv = file->private_data;
    ssize_t res, buf_size;
    unsigned long addr = get_zeroed_page(GFP_KERNEL);
    char *buf = (char *)addr;
    if (!buf)
        return -ENOMEM;

    buf_size = min(count, len - 1);
    if (copy_from_user(buf, userbuf, buf_size)) {
        res = -EFAULT;
        goto out_unlock;
    }
    priv->rf_offset = simple_strtoul(buf, NULL, 16);
    res = count;
out_unlock:
    free_page(addr);
    return res;
}

static ssize_t lbs_wrrf_write(struct file *file,
                    const char __user *userbuf,
                    size_t count, loff_t *ppos)
{

    struct lbs_private *priv = file->private_data;
    ssize_t res, buf_size;
    u32 offset, value;
    unsigned long addr = get_zeroed_page(GFP_KERNEL);
    char *buf = (char *)addr;
    if (!buf)
        return -ENOMEM;

    buf_size = min(count, len - 1);
    if (copy_from_user(buf, userbuf, buf_size)) {
        res = -EFAULT;
        goto out_unlock;
    }
    res = sscanf(buf, "%x %x", &offset, &value);
    if (res != 2) {
        res = -EFAULT;
        goto out_unlock;
    }

    res = lbs_set_reg(priv, CMD_RF_REG_ACCESS, offset, value);
    mdelay(10);

    if (!res)
        res = count;
out_unlock:
    free_page(addr);
    return res;
}

#define FOPS(fread, fwrite) { \
    .owner = THIS_MODULE, \
    .open = simple_open, \
    .read = (fread), \
    .write = (fwrite), \
    .llseek = generic_file_llseek, \
}

struct lbs_debugfs_files {
    const char *name;
    umode_t perm;
    struct file_operations fops;
};

static const struct lbs_debugfs_files debugfs_files[] = {
    { "info", 0444, FOPS(lbs_dev_info, write_file_dummy), },
    { "sleepparams", 0644, FOPS(lbs_sleepparams_read,
                lbs_sleepparams_write), },
    { "hostsleep", 0644, FOPS(lbs_host_sleep_read,
                lbs_host_sleep_write), },
};

static const struct lbs_debugfs_files debugfs_events_files[] = {
    {"low_rssi", 0644, FOPS(lbs_lowrssi_read,
                lbs_lowrssi_write), },
    {"low_snr", 0644, FOPS(lbs_lowsnr_read,
                lbs_lowsnr_write), },
    {"failure_count", 0644, FOPS(lbs_failcount_read,
                lbs_failcount_write), },
    {"beacon_missed", 0644, FOPS(lbs_bcnmiss_read,
                lbs_bcnmiss_write), },
    {"high_rssi", 0644, FOPS(lbs_highrssi_read,
                lbs_highrssi_write), },
    {"high_snr", 0644, FOPS(lbs_highsnr_read,
                lbs_highsnr_write), },
};

static const struct lbs_debugfs_files debugfs_regs_files[] = {
    {"rdmac", 0644, FOPS(lbs_rdmac_read, lbs_rdmac_write), },
    {"wrmac", 0600, FOPS(NULL, lbs_wrmac_write), },
    {"rdbbp", 0644, FOPS(lbs_rdbbp_read, lbs_rdbbp_write), },
    {"wrbbp", 0600, FOPS(NULL, lbs_wrbbp_write), },
    {"rdrf", 0644, FOPS(lbs_rdrf_read, lbs_rdrf_write), },
    {"wrrf", 0600, FOPS(NULL, lbs_wrrf_write), },
};

void lbs_debugfs_init(void)
{
    if (!lbs_dir)
        lbs_dir = debugfs_create_dir("lbs_wireless", NULL);
}

void lbs_debugfs_remove(void)
{
    if (lbs_dir)
         debugfs_remove(lbs_dir);
}

void lbs_debugfs_init_one(struct lbs_private *priv, struct net_device *dev)
{
    int i;
    const struct lbs_debugfs_files *files;
    if (!lbs_dir)
        goto exit;

    priv->debugfs_dir = debugfs_create_dir(dev->name, lbs_dir);
    if (!priv->debugfs_dir)
        goto exit;

    for (i=0; i<ARRAY_SIZE(debugfs_files); i++) {
        files = &debugfs_files[i];
        priv->debugfs_files[i] = debugfs_create_file(files->name,
                                 files->perm,
                                 priv->debugfs_dir,
                                 priv,
                                 &files->fops);
    }

    priv->events_dir = debugfs_create_dir("subscribed_events", priv->debugfs_dir);
    if (!priv->events_dir)
        goto exit;

    for (i=0; i<ARRAY_SIZE(debugfs_events_files); i++) {
        files = &debugfs_events_files[i];
        priv->debugfs_events_files[i] = debugfs_create_file(files->name,
                                 files->perm,
                                 priv->events_dir,
                                 priv,
                                 &files->fops);
    }

    priv->regs_dir = debugfs_create_dir("registers", priv->debugfs_dir);
    if (!priv->regs_dir)
        goto exit;

    for (i=0; i<ARRAY_SIZE(debugfs_regs_files); i++) {
        files = &debugfs_regs_files[i];
        priv->debugfs_regs_files[i] = debugfs_create_file(files->name,
                                 files->perm,
                                 priv->regs_dir,
                                 priv,
                                 &files->fops);
    }

#ifdef PROC_DEBUG
    lbs_debug_init(priv);
#endif
exit:
    return;
}

void lbs_debugfs_remove_one(struct lbs_private *priv)
{
    int i;

    for(i=0; i<ARRAY_SIZE(debugfs_regs_files); i++)
        debugfs_remove(priv->debugfs_regs_files[i]);

    debugfs_remove(priv->regs_dir);

    for(i=0; i<ARRAY_SIZE(debugfs_events_files); i++)
        debugfs_remove(priv->debugfs_events_files[i]);

    debugfs_remove(priv->events_dir);
#ifdef PROC_DEBUG
    debugfs_remove(priv->debugfs_debug);
#endif
    for(i=0; i<ARRAY_SIZE(debugfs_files); i++)
        debugfs_remove(priv->debugfs_files[i]);
    debugfs_remove(priv->debugfs_dir);
}



/* debug entry */

#ifdef PROC_DEBUG

#define item_size(n)    (FIELD_SIZEOF(struct lbs_private, n))
#define item_addr(n)    (offsetof(struct lbs_private, n))


struct debug_data {
    char name[32];
    u32 size;
    size_t addr;
};

/* To debug any member of struct lbs_private, simply add one line here.
 */
static struct debug_data items[] = {
    {"psmode", item_size(psmode), item_addr(psmode)},
    {"psstate", item_size(psstate), item_addr(psstate)},
};

static int num_of_items = ARRAY_SIZE(items);

static ssize_t lbs_debugfs_read(struct file *file, char __user *userbuf,
            size_t count, loff_t *ppos)
{
    int val = 0;
    size_t pos = 0;
    ssize_t res;
    char *p;
    int i;
    struct debug_data *d;
    unsigned long addr = get_zeroed_page(GFP_KERNEL);
    char *buf = (char *)addr;
    if (!buf)
        return -ENOMEM;

    p = buf;

    d = file->private_data;

    for (i = 0; i < num_of_items; i++) {
        if (d[i].size == 1)
            val = *((u8 *) d[i].addr);
        else if (d[i].size == 2)
            val = *((u16 *) d[i].addr);
        else if (d[i].size == 4)
            val = *((u32 *) d[i].addr);
        else if (d[i].size == 8)
            val = *((u64 *) d[i].addr);

        pos += sprintf(p + pos, "%s=%d\n", d[i].name, val);
    }

    res = simple_read_from_buffer(userbuf, count, ppos, p, pos);

    free_page(addr);
    return res;
}

static ssize_t lbs_debugfs_write(struct file *f, const char __user *buf,
                size_t cnt, loff_t *ppos)
{
    int r, i;
    char *pdata;
    char *p;
    char *p0;
    char *p1;
    char *p2;
    struct debug_data *d = f->private_data;

    pdata = kmalloc(cnt, GFP_KERNEL);
    if (pdata == NULL)
        return 0;

    if (copy_from_user(pdata, buf, cnt)) {
        lbs_deb_debugfs("Copy from user failed\n");
        kfree(pdata);
        return 0;
    }

    p0 = pdata;
    for (i = 0; i < num_of_items; i++) {
        do {
            p = strstr(p0, d[i].name);
            if (p == NULL)
                break;
            p1 = strchr(p, '\n');
            if (p1 == NULL)
                break;
            p0 = p1++;
            p2 = strchr(p, '=');
            if (!p2)
                break;
            p2++;
            r = simple_strtoul(p2, NULL, 0);
            if (d[i].size == 1)
                *((u8 *) d[i].addr) = (u8) r;
            else if (d[i].size == 2)
                *((u16 *) d[i].addr) = (u16) r;
            else if (d[i].size == 4)
                *((u32 *) d[i].addr) = (u32) r;
            else if (d[i].size == 8)
                *((u64 *) d[i].addr) = (u64) r;
            break;
        } while (1);
    }
    kfree(pdata);

    return (ssize_t)cnt;
}

static const struct file_operations lbs_debug_fops = {
    .owner = THIS_MODULE,
    .open = simple_open,
    .write = lbs_debugfs_write,
    .read = lbs_debugfs_read,
    .llseek = default_llseek,
};

static void lbs_debug_init(struct lbs_private *priv)
{
    int i;

    if (!priv->debugfs_dir)
        return;

    for (i = 0; i < num_of_items; i++)
        items[i].addr += (size_t) priv;

    priv->debugfs_debug = debugfs_create_file("debug", 0644,
                          priv->debugfs_dir, &items[0],
                          &lbs_debug_fops);
}
#endif