path: root/drivers/net/wireless/b43/debugfs.c

/*

  Broadcom B43 wireless driver

  debugfs driver debugging code

  Copyright (c) 2005-2007 Michael Buesch <mb@bu3sch.de>

  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; see the file COPYING.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  Boston, MA 02110-1301, USA.

*/

#include <linux/fs.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/mutex.h>

#include "b43.h"
#include "main.h"
#include "debugfs.h"
#include "dma.h"
#include "xmit.h"


/* The root directory. */
static struct dentry *rootdir;

struct b43_debugfs_fops {
	ssize_t (*read)(struct b43_wldev *dev, char *buf, size_t bufsize);
	int (*write)(struct b43_wldev *dev, const char *buf, size_t count);
	struct file_operations fops;
	/* Offset of struct b43_dfs_file in struct b43_dfsentry */
	size_t file_struct_offset;
	/* Take wl->irq_lock before calling read/write? */
	bool take_irqlock;
};

static inline
struct b43_dfs_file * fops_to_dfs_file(struct b43_wldev *dev,
				       const struct b43_debugfs_fops *dfops)
{
	void *p;

	p = dev->dfsentry;
	p += dfops->file_struct_offset;

	return p;
}


#define fappend(fmt, x...)	\
	do {							\
		if (bufsize - count)				\
			count += snprintf(buf + count,		\
					  bufsize - count,	\
					  fmt , ##x);		\
		else						\
			printk(KERN_ERR "b43: fappend overflow\n"); \
	} while (0)


/* The biggest address values for SHM access from the debugfs files. */
#define B43_MAX_SHM_ROUTING	4
#define B43_MAX_SHM_ADDR	0xFFFF

static ssize_t shm16read__read_file(struct b43_wldev *dev,
				    char *buf, size_t bufsize)
{
	ssize_t count = 0;
	unsigned int routing, addr;
	u16 val;

	routing = dev->dfsentry->shm16read_routing_next;
	addr = dev->dfsentry->shm16read_addr_next;
	if ((routing > B43_MAX_SHM_ROUTING) ||
	    (addr > B43_MAX_SHM_ADDR))
		return -EDESTADDRREQ;

	val = b43_shm_read16(dev, routing, addr);
	fappend("0x%04X\n", val);

	return count;
}

static int shm16read__write_file(struct b43_wldev *dev,
				 const char *buf, size_t count)
{
	unsigned int routing, addr;
	int res;

	res = sscanf(buf, "0x%X 0x%X", &routing, &addr);
	if (res != 2)
		return -EINVAL;
	if (routing > B43_MAX_SHM_ROUTING)
		return -EADDRNOTAVAIL;
	if (addr > B43_MAX_SHM_ADDR)
		return -EADDRNOTAVAIL;
	if (routing == B43_SHM_SHARED) {
		if ((addr % 2) != 0)
			return -EADDRNOTAVAIL;
	}

	dev->dfsentry->shm16read_routing_next = routing;
	dev->dfsentry->shm16read_addr_next = addr;

	return 0;
}

static int shm16write__write_file(struct b43_wldev *dev,
				  const char *buf, size_t count)
{
	unsigned int routing, addr, mask, set;
	u16 val;
	int res;
	unsigned long flags;

	res = sscanf(buf, "0x%X 0x%X 0x%X 0x%X",
		     &routing, &addr, &mask, &set);
	if (res != 4)
		return -EINVAL;
	if (routing > B43_MAX_SHM_ROUTING)
		return -EADDRNOTAVAIL;
	if (addr > B43_MAX_SHM_ADDR)
		return -EADDRNOTAVAIL;
	if (routing == B43_SHM_SHARED) {
		if ((addr % 2) != 0)
			return -EADDRNOTAVAIL;
	}
	if ((mask > 0xFFFF) || (set > 0xFFFF))
		return -E2BIG;

	spin_lock_irqsave(&dev->wl->shm_lock, flags);
	if (mask == 0)
		val = 0;
	else
		val = __b43_shm_read16(dev, routing, addr);
	val &= mask;
	val |= set;
	__b43_shm_write16(dev, routing, addr, val);
	spin_unlock_irqrestore(&dev->wl->shm_lock, flags);

	return 0;
}

static ssize_t shm32read__read_file(struct b43_wldev *dev,
				    char *buf, size_t bufsize)
{
	ssize_t count = 0;
	unsigned int routing, addr;
	u32 val;

	routing = dev->dfsentry->shm32read_routing_next;
	addr = dev->dfsentry->shm32read_addr_next;
	if ((routing > B43_MAX_SHM_ROUTING) ||
	    (addr > B43_MAX_SHM_ADDR))
		return -EDESTADDRREQ;

	val = b43_shm_read32(dev, routing, addr);
	fappend("0x%08X\n", val);

	return count;
}

static int shm32read__write_file(struct b43_wldev *dev,
				 const char *buf, size_t count)
{
	unsigned int routing,