drivers/net/wireless/rt2x00/rt2x00debug.c - android_kernel_htc_msm8960 - Gitiles

 /*
 	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
 	<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/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 flags file
 	 *   - register folder
 	 *     - csr offset/value files
 	 *     - eeprom offset/value files
 	 *     - bbp offset/value files
 	 *     - rf 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 *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 *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 seperately 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;
 };

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

 	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 *desc = get_skb_frame_desc(skb);
 	struct sk_buff *skbcopy;
 	struct rt2x00dump_hdr *dump_hdr;
 	struct timeval timestamp;

 	do_gettimeofday(&timestamp);

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

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

 	skbcopy = alloc_skb(sizeof(*dump_hdr) + desc->desc_len + skb->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(desc->desc_len);
 	dump_hdr->data_length = cpu_to_le32(skb->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_le32(rt2x00dev->chip.rev);
 	dump_hdr->type = cpu_to_le16(type);
 	dump_hdr->queue_index = desc->entry->queue->qid;
 	dump_hdr->entry_index = desc->entry->entry_idx;
 	dump_hdr->timestamp_sec = cpu_to_le32(timestamp.tv_sec);
 	dump_hdr->timestamp_usec = cpu_to_le32(timestamp.tv_usec);

 	memcpy(skb_put(skbcopy, desc->desc_len), desc->desc, desc->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);
 }

 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,
 };

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

 	temp = data +
 	    sprintf(data, "qid\tcount\tlimit\tlength\tindex\tdone\tcrypto\n");

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

 		temp += sprintf(temp, "%d\t%d\t%d\t%d\t%d\t%d\t%d\n", queue->qid,
 				queue->count, queue->limit, queue->length,
 				queue->index[Q_INDEX],
 				queue->index[Q_INDEX_DONE],
 				queue->index[Q_INDEX_CRYPTO]);

 		spin_unlock_irqrestore(&queue->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,
 };

 #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;
 	char *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,
 };
 #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;						\
 	__type value;						\
 								\
 	if (*offset)						\
 		return 0;					\
 								\
 	if (intf->offset_##__name >= debug->__name.word_count)	\
 		return -EINVAL;					\
 								\
 	debug->__name.read(intf->rt2x00dev,			\
 			   intf->offset_##__name, &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;						\
 	__type value;						\
 								\
 	if (*offset)						\
 		return 0;					\
 								\
 	if (intf->offset_##__name >= debug->__name.word_count)	\
 		return -EINVAL;					\
 								\
 	if (copy_from_user(line, buf, length))			\
 		return -EFAULT;					\
 								\
 	size = strlen(line);					\
 	value = simple_strtoul(line, NULL, 0);			\
 								\
 	debug->__name.write(intf->rt2x00dev,			\
 			    intf->offset_##__name, 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,		\
 };

 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);

 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,
 };

 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: %s\n", intf->rt2x00dev->ops->name);
 	data += sprintf(data, "version: %s\n", DRV_VERSION);
 	data += sprintf(data, "compiled: %s %s\n", __DATE__, __TIME__);
 	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(8 * MAX_LINE_LENGTH, GFP_KERNEL);
 	if (!data)
 		return NULL;

 	blob->data = data;
 	data += sprintf(data, "rt chip: %04x\n", intf->rt2x00dev->chip.rt);
 	data += sprintf(data, "rf chip: %04x\n", intf->rt2x00dev->chip.rf);
 	data += sprintf(data, "revision:%08x\n", intf->rt2x00dev->chip.rev);
 	data += sprintf(data, "\n");
 	data += sprintf(data, "csr length: %d\n", debug->csr.word_count);
 	data += sprintf(data, "eeprom length: %d\n", debug->eeprom.word_count);
 	data += sprintf(data, "bbp length: %d\n", debug->bbp.word_count);
 	data += sprintf(data, "rf length: %d\n", debug->rf.word_count);
 	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))
 		goto exit;

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

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

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

 #define RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(__intf, __name)	\
 ({								\
 	(__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))		\
 		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))		\
 		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);

 #undef RT2X00DEBUGFS_CREATE_REGISTER_ENTRY

 	intf->queue_folder =
 	    debugfs_create_dir("queue", intf->driver_folder);
 	if (IS_ERR(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))
 		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(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->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");

 	return;
 }

 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->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->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;
 }
	/*
	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
	<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/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 flags file
	* - register folder
	* - csr offset/value files
	* - eeprom offset/value files
	* - bbp offset/value files
	* - rf 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 *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 *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 seperately 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;
	};

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

	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 *desc = get_skb_frame_desc(skb);
	struct sk_buff *skbcopy;
	struct rt2x00dump_hdr *dump_hdr;
	struct timeval timestamp;

	do_gettimeofday(&timestamp);

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

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

	skbcopy = alloc_skb(sizeof(*dump_hdr) + desc->desc_len + skb->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(desc->desc_len);
	dump_hdr->data_length = cpu_to_le32(skb->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_le32(rt2x00dev->chip.rev);
	dump_hdr->type = cpu_to_le16(type);
	dump_hdr->queue_index = desc->entry->queue->qid;
	dump_hdr->entry_index = desc->entry->entry_idx;
	dump_hdr->timestamp_sec = cpu_to_le32(timestamp.tv_sec);
	dump_hdr->timestamp_usec = cpu_to_le32(timestamp.tv_usec);

	memcpy(skb_put(skbcopy, desc->desc_len), desc->desc, desc->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);
	}

	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,
	};

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

	temp = data +
	sprintf(data, "qid\tcount\tlimit\tlength\tindex\tdone\tcrypto\n");

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

	temp += sprintf(temp, "%d\t%d\t%d\t%d\t%d\t%d\t%d\n", queue->qid,
	queue->count, queue->limit, queue->length,
	queue->index[Q_INDEX],
	queue->index[Q_INDEX_DONE],
	queue->index[Q_INDEX_CRYPTO]);

	spin_unlock_irqrestore(&queue->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,
	};

	#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;
	char *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,
	};
	#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; \
	__type value; \
	\
	if (*offset) \
	return 0; \
	\
	if (intf->offset_##__name >= debug->__name.word_count) \
	return -EINVAL; \
	\
	debug->__name.read(intf->rt2x00dev, \
	intf->offset_##__name, &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; \
	__type value; \
	\
	if (*offset) \
	return 0; \
	\
	if (intf->offset_##__name >= debug->__name.word_count) \
	return -EINVAL; \
	\
	if (copy_from_user(line, buf, length)) \
	return -EFAULT; \
	\
	size = strlen(line); \
	value = simple_strtoul(line, NULL, 0); \
	\
	debug->__name.write(intf->rt2x00dev, \
	intf->offset_##__name, 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, \
	};

	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);

	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,
	};

	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: %s\n", intf->rt2x00dev->ops->name);
	data += sprintf(data, "version: %s\n", DRV_VERSION);
	data += sprintf(data, "compiled: %s %s\n", __DATE__, __TIME__);
	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(8 * MAX_LINE_LENGTH, GFP_KERNEL);
	if (!data)
	return NULL;

	blob->data = data;
	data += sprintf(data, "rt chip: %04x\n", intf->rt2x00dev->chip.rt);
	data += sprintf(data, "rf chip: %04x\n", intf->rt2x00dev->chip.rf);
	data += sprintf(data, "revision:%08x\n", intf->rt2x00dev->chip.rev);
	data += sprintf(data, "\n");
	data += sprintf(data, "csr length: %d\n", debug->csr.word_count);
	data += sprintf(data, "eeprom length: %d\n", debug->eeprom.word_count);
	data += sprintf(data, "bbp length: %d\n", debug->bbp.word_count);
	data += sprintf(data, "rf length: %d\n", debug->rf.word_count);
	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))
	goto exit;

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

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

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

	#define RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(__intf, __name) \
	({ \
	(__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)) \
	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)) \
	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);

	#undef RT2X00DEBUGFS_CREATE_REGISTER_ENTRY

	intf->queue_folder =
	debugfs_create_dir("queue", intf->driver_folder);
	if (IS_ERR(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))
	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(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->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");

	return;
	}

	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->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->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;
	}