bcm43xx_debugfs.c

无线网卡驱动,有很好的参考价值,在linux_2.6.21下可以直接使用,如果在其他平台,可以参考移植

/*

  Broadcom BCM43xx wireless driver

  debugfs driver debugging code

  Copyright (c) 2005 Michael Buesch <[e-mail]>

  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 <asm/io.h>

#include "bcm43xx.h"
#include "bcm43xx_main.h"
#include "bcm43xx_debugfs.h"
#include "bcm43xx_dma.h"
#include "bcm43xx_pio.h"
#include "bcm43xx_xmit.h"

#define REALLY_BIG_BUFFER_SIZE	(1024*256)

static struct bcm43xx_debugfs fs;
static char really_big_buffer[REALLY_BIG_BUFFER_SIZE];
static DECLARE_MUTEX(big_buffer_sem);


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

static int open_file_generic(struct inode *inode, struct file *file)
{
	file->private_data = inode->i_private;
	return 0;
}

#define fappend(fmt, x...)	pos += snprintf(buf + pos, len - pos, fmt , ##x)

static ssize_t devinfo_read_file(struct file *file, char __user *userbuf,
				 size_t count, loff_t *ppos)
{
	const size_t len = REALLY_BIG_BUFFER_SIZE;

	struct bcm43xx_private *bcm = file->private_data;
	char *buf = really_big_buffer;
	size_t pos = 0;
	ssize_t res;
	struct net_device *net_dev;
	struct pci_dev *pci_dev;
	unsigned long flags;
	u16 tmp16;
	int i;

	down(&big_buffer_sem);

	mutex_lock(&bcm->mutex);
	spin_lock_irqsave(&bcm->irq_lock, flags);
	if (bcm43xx_status(bcm) != BCM43xx_STAT_INITIALIZED) {
		fappend("Board not initialized.\n");
		goto out;
	}
	net_dev = bcm->net_dev;
	pci_dev = bcm->pci_dev;

	/* This is where the information is written to the "devinfo" file */
	fappend("*** %s devinfo ***\n", net_dev->name);
	fappend("vendor:           0x%04x   device:           0x%04x\n",
		pci_dev->vendor, pci_dev->device);
	fappend("subsystem_vendor: 0x%04x   subsystem_device: 0x%04x\n",
		pci_dev->subsystem_vendor, pci_dev->subsystem_device);
	fappend("IRQ: %d\n", bcm->irq);
	fappend("mmio_addr: 0x%p\n", bcm->mmio_addr);
	fappend("chip_id: 0x%04x   chip_rev: 0x%02x\n", bcm->chip_id, bcm->chip_rev);
	if ((bcm->core_80211[0].rev >= 3) && (bcm43xx_read32(bcm, 0x0158) & (1 << 16)))
		fappend("Radio disabled by hardware!\n");
	if ((bcm->core_80211[0].rev < 3) && !(bcm43xx_read16(bcm, 0x049A) & (1 << 4)))
		fappend("Radio disabled by hardware!\n");
	fappend("board_vendor: 0x%04x   board_type: 0x%04x\n", bcm->board_vendor,
	        bcm->board_type);

	fappend("\nCores:\n");
#define fappend_core(name, info) fappend("core \"" name "\" %s, %s, id: 0x%04x, "	\
					 "rev: 0x%02x, index: 0x%02x\n",		\
					 (info).available				\
						? "available" : "nonavailable",		\
					 (info).enabled					\
						? "enabled" : "disabled",		\
					 (info).id, (info).rev, (info).index)
	fappend_core("CHIPCOMMON", bcm->core_chipcommon);
	fappend_core("PCI", bcm->core_pci);
	fappend_core("first 80211", bcm->core_80211[0]);
	fappend_core("second 80211", bcm->core_80211[1]);
#undef fappend_core
	tmp16 = bcm43xx_read16(bcm, BCM43xx_MMIO_GPIO_CONTROL);
	fappend("LEDs: ");
	for (i = 0; i < BCM43xx_NR_LEDS; i++)
		fappend("%d ", !!(tmp16 & (1 << i)));
	fappend("\n");

out:
	spin_unlock_irqrestore(&bcm->irq_lock, flags);
	mutex_unlock(&bcm->mutex);
	res = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
	up(&big_buffer_sem);
	return res;
}

static ssize_t drvinfo_read_file(struct file *file, char __user *userbuf,
				 size_t count, loff_t *ppos)
{
	const size_t len = REALLY_BIG_BUFFER_SIZE;

	char *buf = really_big_buffer;
	size_t pos = 0;
	ssize_t res;

	down(&big_buffer_sem);

	/* This is where the information is written to the "driver" file */
	fappend(KBUILD_MODNAME " driver\n");
	fappend("Compiled at: %s %s\n", __DATE__, __TIME__);

	res = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
	up(&big_buffer_sem);
	return res;
}

static ssize_t spromdump_read_file(struct file *file, char __user *userbuf,
				 size_t count, loff_t *ppos)
{
	const size_t len = REALLY_BIG_BUFFER_SIZE;

	struct bcm43xx_private *bcm = file->private_data;
	char *buf = really_big_buffer;
	size_t pos = 0;
	ssize_t res;
	unsigned long flags;

	down(&big_buffer_sem);
	mutex_lock(&bcm->mutex);
	spin_lock_irqsave(&bcm->irq_lock, flags);
	if (bcm43xx_status(bcm) != BCM43xx_STAT_INITIALIZED) {
		fappend("Board not initialized.\n");
		goto out;
	}

	/* This is where the information is written to the "sprom_dump" file */
	fappend("boardflags: 0x%04x\n", bcm->sprom.boardflags);

out:
	spin_unlock_irqrestore(&bcm->irq_lock, flags);
	mutex_unlock(&bcm->mutex);
	res = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
	up(&big_buffer_sem);
	return res;
}

static ssize_t tsf_read_file(struct file *file, char __user *userbuf,
			     size_t count, loff_t *ppos)
{
	const size_t len = REALLY_BIG_BUFFER_SIZE;

	struct bcm43xx_private *bcm = file->private_data;
	char *buf = really_big_buffer;
	size_t pos = 0;
	ssize_t res;
	unsigned long flags;
	u64 tsf;

	down(&big_buffer_sem);
	mutex_lock(&bcm->mutex);
	spin_lock_irqsave(&bcm->irq_lock, flags);
	if (bcm43xx_status(bcm) != BCM43xx_STAT_INITIALIZED) {
		fappend("Board not initialized.\n");
		goto out;
	}
	bcm43xx_tsf_read(bcm, &tsf);
	fappend("0x%08x%08x\n",
		(unsigned int)((tsf & 0xFFFFFFFF00000000ULL) >> 32),
		(unsigned int)(tsf & 0xFFFFFFFFULL));

out:
	spin_unlock_irqrestore(&bcm->irq_lock, flags);
	mutex_unlock(&bcm->mutex);
	res = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
	up(&big_buffer_sem);
	return res;
}

static ssize_t tsf_write_file(struct file *file, const char __user *user_buf,
			      size_t count, loff_t *ppos)
{
	struct bcm43xx_private *bcm = file->private_data;
	char *buf = really_big_buffer;
	ssize_t buf_size;
	ssize_t res;
	unsigned long flags;
	u64 tsf;

	buf_size = min(count, sizeof (really_big_buffer) - 1);
	down(&big_buffer_sem);
	if (copy_from_user(buf, user_buf, buf_size)) {
	        res = -EFAULT;
		goto out_up;
	}
	mutex_lock(&bcm->mutex);
	spin_lock_irqsave(&bcm->irq_lock, flags);
	if (bcm43xx_status(bcm) != BCM43xx_STAT_INITIALIZED) {
		printk(KERN_INFO PFX "debugfs: Board not initialized.\n");
		res = -EFAULT;
		goto out_unlock;
	}
	if (sscanf(buf, "%lli", &tsf) != 1) {
		printk(KERN_INFO PFX "debugfs: invalid values for \"tsf\"\n");
		res = -EINVAL;
		goto out_unlock;
	}
	bcm43xx_tsf_write(bcm, tsf);
	mmiowb();
	res = buf_size;
	
out_unlock:
	spin_unlock_irqrestore(&bcm->irq_lock, flags);
	mutex_unlock(&bcm->mutex);
out_up:
	up(&big_buffer_sem);
	return res;
}

static ssize_t txstat_read_file(struct file *file, char __user *userbuf,
				size_t count, loff_t *ppos)
{
	const size_t len = REALLY_BIG_BUFFER_SIZE;

	struct bcm43xx_private *bcm = file->private_data;
	char *buf = really_big_buffer;
	size_t pos = 0;
	ssize_t res;
	unsigned long flags;
	struct bcm43xx_dfsentry *e;
	struct bcm43xx_xmitstatus *status;
	int i, cnt, j = 0;

	down(&big_buffer_sem);
	mutex_lock(&bcm->mutex);
	spin_lock_irqsave(&bcm->irq_lock, flags);

	fappend("Last %d logged xmitstatus blobs (Latest first):\n\n",
		BCM43xx_NR_LOGGED_XMITSTATUS);
	e = bcm->dfsentry;
	if (e->xmitstatus_printing == 0) {
		/* At the beginning, make a copy of all data to avoid
		 * concurrency, as this function is called multiple
		 * times for big logs. Without copying, the data might
		 * change between reads. This would result in total trash.