[B43LEGACY]: add mac80211-based driver for legacy BCM43xx devices

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 505 insertions, 0 deletions

diff --git a/drivers/net/wireless/b43legacy/debugfs.c b/drivers/net/wireless/b43legacy/debugfs.c
new file mode 100644
index 000000000000..eefa6fb79685
--- /dev/null
+++ b/drivers/net/wireless/b43legacy/debugfs.c
@@ -0,0 +1,505 @@
+/*
+
+  Broadcom B43legacy 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 "b43legacy.h"
+#include "main.h"
+#include "debugfs.h"
+#include "dma.h"
+#include "pio.h"
+#include "xmit.h"
+
+
+/* The root directory. */
+static struct dentry *rootdir;
+
+struct b43legacy_debugfs_fops {
+	ssize_t (*read)(struct b43legacy_wldev *dev, char *buf, size_t bufsize);
+	int (*write)(struct b43legacy_wldev *dev, const char *buf, size_t count);
+	struct file_operations fops;
+	/* Offset of struct b43legacy_dfs_file in struct b43legacy_dfsentry */
+	size_t file_struct_offset;
+	/* Take wl->irq_lock before calling read/write? */
+	bool take_irqlock;
+};
+
+static inline
+struct b43legacy_dfs_file * fops_to_dfs_file(struct b43legacy_wldev *dev,
+				       const struct b43legacy_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 "b43legacy: fappend overflow\n"); \
+	} while (0)
+
+
+/* wl->irq_lock is locked */
+static ssize_t tsf_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize)
+{
+	ssize_t count = 0;
+	u64 tsf;
+
+	b43legacy_tsf_read(dev, &tsf);
+	fappend("0x%08x%08x\n",
+		(unsigned int)((tsf & 0xFFFFFFFF00000000ULL) >> 32),
+		(unsigned int)(tsf & 0xFFFFFFFFULL));
+
+	return count;
+}
+
+/* wl->irq_lock is locked */
+static int tsf_write_file(struct b43legacy_wldev *dev, const char *buf, size_t count)
+{
+	u64 tsf;
+
+	if (sscanf(buf, "%llu", (unsigned long long *)(&tsf)) != 1)
+		return -EINVAL;
+	b43legacy_tsf_write(dev, tsf);
+
+	return 0;
+}
+
+/* wl->irq_lock is locked */
+static ssize_t ucode_regs_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize)
+{
+	ssize_t count = 0;
+	int i;
+
+	for (i = 0; i < 64; i++) {
+		fappend("r%d = 0x%04x\n", i,
+			b43legacy_shm_read16(dev, B43legacy_SHM_WIRELESS, i));
+	}
+
+	return count;
+}
+
+/* wl->irq_lock is locked */
+static ssize_t shm_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize)
+{
+	ssize_t count = 0;
+	int i;
+	u16 tmp;
+	__le16 *le16buf = (__le16 *)buf;
+
+	for (i = 0; i < 0x1000; i++) {
+		if (bufsize <= 0)
+			break;
+		tmp = b43legacy_shm_read16(dev, B43legacy_SHM_SHARED, 2 * i);
+		le16buf[i] = cpu_to_le16(tmp);
+		count += sizeof(tmp);
+		bufsize -= sizeof(tmp);
+	}
+
+	return count;
+}
+
+static ssize_t txstat_read_file(struct b43legacy_wldev *dev, char *buf, size_t bufsize)
+{
+	struct b43legacy_txstatus_log *log = &dev->dfsentry->txstatlog;
+	ssize_t count = 0;
+	unsigned long flags;
+	int i, idx;
+	struct b43legacy_txstatus *stat;
+
+	spin_lock_irqsave(&log->lock, flags);
+	if (log->end < 0) {
+		fappend("Nothing transmitted, yet\n");
+		goto out_unlock;
+	}
+	fappend("b43legacy TX status reports:\n\n"
+		"index | cookie | seq | phy_stat | frame_count | "
+		"rts_count | supp_reason | pm_indicated | "
+		"intermediate | for_ampdu | acked\n" "---\n");
+	i = log->end + 1;
+	idx = 0;
+	while (1) {
+		if (i == B43legacy_NR_LOGGED_TXSTATUS)
+			i = 0;
+		stat = &(log->log[i]);
+		if (stat->cookie) {
+			fappend("%03d | "
+				"0x%04X | 0x%04X | 0x%02X | "
+				"0x%X | 0x%X | "
+				"%u | %u | "
+				"%u | %u | %u\n",
+				idx,
+				stat->cookie, stat->seq, stat->phy_stat,
+				stat->frame_count, stat->rts_count,
+				stat->supp_reason, stat->pm_indicated,
+				stat->intermediate, stat->for_ampdu,
+				stat->acked);
+			idx++;
+		}
+		if (i == log->end)
+			break;
+		i++;
+	}
+out_unlock:
+	spin_unlock_irqrestore(&log->lock, flags);
+
+	return count;
+}
+
+/* wl->irq_lock is locked */
+static int restart_write_file(struct b43legacy_wldev *dev, const char *buf, size_t count)
+{
+	int err = 0;
+
+	if (count > 0 && buf[0] == '1') {
+		b43legacy_controller_restart(dev, "manually restarted");
+	} else
+		err = -EINVAL;
+
+	return err;
+}
+
+#undef fappend
+
+static int b43legacy_debugfs_open(struct inode *inode, struct file *file)
+{
+	file->private_data = inode->i_private;
+	return 0;
+}
+
+static ssize_t b43legacy_debugfs_read(struct file *file, char __user *userbuf,
+				size_t count, loff_t *ppos)
+{
+	struct b43legacy_wldev *dev;
+	struct b43legacy_debugfs_fops *dfops;
+	struct b43legacy_dfs_file *dfile;
+	ssize_t ret = 0;
+	char *buf;
+	const size_t bufsize = 1024 * 128;
+	const size_t buforder = get_order(bufsize);
+	int err = 0;
+
+	if (!count)
+		return 0;
+	dev = file->private_data;
+	if (!dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->wl->mutex);
+	if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED) {
+		err = -ENODEV;
+		goto out_unlock;
+	}
+
+	dfops = container_of(file->f_op, struct b43legacy_debugfs_fops, fops);
+	if (!dfops->read) {
+		err = -ENOSYS;
+		goto out_unlock;
+	}
+	dfile = fops_to_dfs_file(dev, dfops);
+
+	if (!dfile->buffer) {
+		buf = (char *)__get_free_pages(GFP_KERNEL, buforder);
+		if (!buf) {
+			err = -ENOMEM;
+			goto out_unlock;
+		}
+		memset(buf, 0, bufsize);
+		if (dfops->take_irqlock) {
+			spin_lock_irq(&dev->wl->irq_lock);
+			ret = dfops->read(dev, buf, bufsize);
+			spin_unlock_irq(&dev->wl->irq_lock);
+		} else
+			ret = dfops->read(dev, buf, bufsize);
+		if (ret <= 0) {
+			free_pages((unsigned long)buf, buforder);
+			err = ret;
+			goto out_unlock;
+		}
+		dfile->data_len = ret;
+		dfile->buffer = buf;
+	}
+
+	ret = simple_read_from_buffer(userbuf, count, ppos,
+				      dfile->buffer,
+				      dfile->data_len);
+	if (*ppos >= dfile->data_len) {
+		free_pages((unsigned long)dfile->buffer, buforder);
+		dfile->buffer = NULL;
+		dfile->data_len = 0;
+	}
+out_unlock:
+	mutex_unlock(&dev->wl->mutex);
+
+	return err ? err : ret;
+}
+
+static ssize_t b43legacy_debugfs_write(struct file *file,
+				 const char __user *userbuf,
+				 size_t count, loff_t *ppos)
+{
+	struct b43legacy_wldev *dev;
+	struct b43legacy_debugfs_fops *dfops;
+	char *buf;
+	int err = 0;
+
+	if (!count)
+		return 0;
+	if (count > PAGE_SIZE)
+		return -E2BIG;
+	dev = file->private_data;
+	if (!dev)
+		return -ENODEV;
+
+	mutex_lock(&dev->wl->mutex);
+	if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED) {
+		err = -ENODEV;
+		goto out_unlock;
+	}
+
+	dfops = container_of(file->f_op, struct b43legacy_debugfs_fops, fops);
+	if (!dfops->write) {
+		err = -ENOSYS;
+		goto out_unlock;
+	}
+
+	buf = (char *)get_zeroed_page(GFP_KERNEL);
+	if (!buf) {
+		err = -ENOMEM;
+		goto out_unlock;
+	}
+	if (copy_from_user(buf, userbuf, count)) {
+		err = -EFAULT;
+		goto out_freepage;
+	}
+	if (dfops->take_irqlock) {
+		spin_lock_irq(&dev->wl->irq_lock);
+		err = dfops->write(dev, buf, count);
+		spin_unlock_irq(&dev->wl->irq_lock);
+	} else
+		err = dfops->write(dev, buf, count);
+	if (err)
+		goto out_freepage;
+
+out_freepage:
+	free_page((unsigned long)buf);
+out_unlock:
+	mutex_unlock(&dev->wl->mutex);
+
+	return err ? err : count;
+}
+
+
+#define B43legacy_DEBUGFS_FOPS(name, _read, _write, _take_irqlock)	\
+	static struct b43legacy_debugfs_fops fops_##name = {		\
+		.read	= _read,				\
+		.write	= _write,				\
+		.fops	= {					\
+			.open	= b43legacy_debugfs_open,		\
+			.read	= b43legacy_debugfs_read,		\
+			.write	= b43legacy_debugfs_write,		\
+		},						\
+		.file_struct_offset = offsetof(struct b43legacy_dfsentry, \
+					       file_##name),	\
+		.take_irqlock	= _take_irqlock,		\
+	}
+
+B43legacy_DEBUGFS_FOPS(tsf, tsf_read_file, tsf_write_file, 1);
+B43legacy_DEBUGFS_FOPS(ucode_regs, ucode_regs_read_file, NULL, 1);
+B43legacy_DEBUGFS_FOPS(shm, shm_read_file, NULL, 1);
+B43legacy_DEBUGFS_FOPS(txstat, txstat_read_file, NULL, 0);
+B43legacy_DEBUGFS_FOPS(restart, NULL, restart_write_file, 1);
+
+
+int b43legacy_debug(struct b43legacy_wldev *dev, enum b43legacy_dyndbg feature)
+{
+	return !!(dev->dfsentry && dev->dfsentry->dyn_debug[feature]);
+}
+
+static void b43legacy_remove_dynamic_debug(struct b43legacy_wldev *dev)
+{
+	struct b43legacy_dfsentry *e = dev->dfsentry;
+	int i;
+
+	for (i = 0; i < __B43legacy_NR_DYNDBG; i++)
+		debugfs_remove(e->dyn_debug_dentries[i]);
+}
+
+static void b43legacy_add_dynamic_debug(struct b43legacy_wldev *dev)
+{
+	struct b43legacy_dfsentry *e = dev->dfsentry;
+	struct dentry *d;
+
+#define add_dyn_dbg(name, id, initstate) do {		\
+	e->dyn_debug[id] = (initstate);			\
+	d = debugfs_create_bool(name, 0600, e->subdir,	\
+				&(e->dyn_debug[id]));	\
+	if (!IS_ERR(d))					\
+		e->dyn_debug_dentries[id] = d;		\
+				} while (0)
+
+	add_dyn_dbg("debug_xmitpower", B43legacy_DBG_XMITPOWER, 0);
+	add_dyn_dbg("debug_dmaoverflow", B43legacy_DBG_DMAOVERFLOW, 0);
+	add_dyn_dbg("debug_dmaverbose", B43legacy_DBG_DMAVERBOSE, 0);
+	add_dyn_dbg("debug_pwork_fast", B43legacy_DBG_PWORK_FAST, 0);
+	add_dyn_dbg("debug_pwork_stop", B43legacy_DBG_PWORK_STOP, 0);
+
+#undef add_dyn_dbg
+}
+
+void b43legacy_debugfs_add_device(struct b43legacy_wldev *dev)
+{
+	struct b43legacy_dfsentry *e;
+	struct b43legacy_txstatus_log *log;
+	char devdir[16];
+
+	B43legacy_WARN_ON(!dev);
+	e = kzalloc(sizeof(*e), GFP_KERNEL);
+	if (!e) {
+		b43legacyerr(dev->wl, "debugfs: add device OOM\n");
+		return;
+	}
+	e->dev = dev;
+	log = &e->txstatlog;
+	log->log = kcalloc(B43legacy_NR_LOGGED_TXSTATUS,
+			   sizeof(struct b43legacy_txstatus), GFP_KERNEL);
+	if (!log->log) {
+		b43legacyerr(dev->wl, "debugfs: add device txstatus OOM\n");
+		kfree(e);
+		return;
+	}
+	log->end = -1;
+	spin_lock_init(&log->lock);
+
+	dev->dfsentry = e;
+
+	snprintf(devdir, sizeof(devdir), "%s", wiphy_name(dev->wl->hw->wiphy));
+	e->subdir = debugfs_create_dir(devdir, rootdir);
+	if (!e->subdir || IS_ERR(e->subdir)) {
+		if (e->subdir == ERR_PTR(-ENODEV)) {
+			b43legacydbg(dev->wl, "DebugFS (CONFIG_DEBUG_FS) not "
+			       "enabled in kernel config\n");
+		} else {
+			b43legacyerr(dev->wl, "debugfs: cannot create %s directory\n",
+			       devdir);
+		}
+		dev->dfsentry = NULL;
+		kfree(log->log);
+		kfree(e);
+		return;
+	}
+
+#define ADD_FILE(name, mode)	\
+	do {							\
+		struct dentry *d;				\
+		d = debugfs_create_file(__stringify(name),	\
+					mode, e->subdir, dev,	\
+					&fops_##name.fops);	\
+		e->file_##name.dentry = NULL;			\
+		if (!IS_ERR(d))					\
+			e->file_##name.dentry = d;		\
+	} while (0)
+
+
+	ADD_FILE(tsf, 0600);
+	ADD_FILE(ucode_regs, 0400);
+	ADD_FILE(shm, 0400);
+	ADD_FILE(txstat, 0400);
+	ADD_FILE(restart, 0200);
+
+#undef ADD_FILE
+
+	b43legacy_add_dynamic_debug(dev);
+}
+
+void b43legacy_debugfs_remove_device(struct b43legacy_wldev *dev)
+{
+	struct b43legacy_dfsentry *e;
+
+	if (!dev)
+		return;
+	e = dev->dfsentry;
+	if (!e)
+		return;
+	b43legacy_remove_dynamic_debug(dev);
+
+	debugfs_remove(e->file_tsf.dentry);
+	debugfs_remove(e->file_ucode_regs.dentry);
+	debugfs_remove(e->file_shm.dentry);
+	debugfs_remove(e->file_txstat.dentry);
+	debugfs_remove(e->file_restart.dentry);
+
+	debugfs_remove(e->subdir);
+	kfree(e->txstatlog.log);
+	kfree(e);
+}
+
+void b43legacy_debugfs_log_txstat(struct b43legacy_wldev *dev,
+			    const struct b43legacy_txstatus *status)
+{
+	struct b43legacy_dfsentry *e = dev->dfsentry;
+	struct b43legacy_txstatus_log *log;
+	struct b43legacy_txstatus *cur;
+	int i;
+
+	if (!e)
+		return;
+	log = &e->txstatlog;
+	B43legacy_WARN_ON(!irqs_disabled());
+	spin_lock(&log->lock);
+	i = log->end + 1;
+	if (i == B43legacy_NR_LOGGED_TXSTATUS)
+		i = 0;
+	log->end = i;
+	cur = &(log->log[i]);
+	memcpy(cur, status, sizeof(*cur));
+	spin_unlock(&log->lock);
+}
+
+void b43legacy_debugfs_init(void)
+{
+	rootdir = debugfs_create_dir(KBUILD_MODNAME, NULL);
+	if (IS_ERR(rootdir))
+		rootdir = NULL;
+}
+
+void b43legacy_debugfs_exit(void)
+{
+	debugfs_remove(rootdir);
+}