[PATCH] b43legacy: Add debugfs file to dump microcode registers

[Larry Finger]

From: Michael Buesch <[EMAIL PROTECTED]>

This adds a debugfs file to dump all microcode registers.
Note that the dumping is racy, as microcode continues to run
while we loop over each register to dump it.

Signed-off-by: Michael Buesch <[EMAIL PROTECTED]>
Signed-off-by: Larry Finger <[EMAIL PROTECTED]>

Index: wireless-dev/drivers/net/wireless/b43legacy/debugfs.c
===================================================================
--- wireless-dev.orig/drivers/net/wireless/b43legacy/debugfs.c
+++ wireless-dev/drivers/net/wireless/b43legacy/debugfs.c
@@ -151,6 +151,39 @@ out_unlock_bb:
        return res;
 }
 
+static ssize_t ucode_regs_read_file(struct file *file, char __user * userbuf,
+                                   size_t count, loff_t * ppos)
+{
+       struct b43legacy_wldev *dev = file->private_data;
+       const size_t len = ARRAY_SIZE(big_buffer);
+       char *buf = big_buffer;
+       size_t pos = 0;
+       ssize_t res;
+       unsigned long flags;
+       int i;
+
+       mutex_lock(&big_buffer_mutex);
+       mutex_lock(&dev->wl->mutex);
+       spin_lock_irqsave(&dev->wl->irq_lock, flags);
+       if (b43legacy_status(dev) < B43legacy_STAT_INITIALIZED) {
+               fappend("Board not initialized.\n");
+               goto out;
+       }
+
+       for (i = 0; i < 64; i++) {
+               fappend("r%d = 0x%04x\n", i,
+                       b43legacy_shm_read16(dev, B43legacy_SHM_WIRELESS, i));
+       }
+
+out:
+       spin_unlock_irqrestore(&dev->wl->irq_lock, flags);
+       mutex_unlock(&dev->wl->mutex);
+       res = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
+       mutex_unlock(&big_buffer_mutex);
+
+       return res;
+}
+
 static ssize_t power_read_file(struct file *file, char __user *userbuf,
                             size_t count, loff_t *ppos)
 {
@@ -344,6 +377,11 @@ static struct file_operations tsf_fops =
        .open = open_file_generic,
 };
 
+static struct file_operations ucode_regs_fops = {
+       .read = ucode_regs_read_file,
+       .open = open_file_generic,
+};
+
 static struct file_operations txstat_fops = {
        .read = txstat_read_file,
        .write = write_file_dummy,
@@ -442,6 +480,10 @@ void b43legacy_debugfs_add_device(struct
                                             dev, &tsf_fops);
        if (IS_ERR(e->dentry_tsf))
                e->dentry_tsf = NULL;
+       e->dentry_ucode_regs = debugfs_create_file("ucode_regs", 0400, 
e->subdir,
+                                                  dev, &ucode_regs_fops);
+       if (IS_ERR(e->dentry_ucode_regs))
+               e->dentry_ucode_regs = NULL;
        e->dentry_txstat = debugfs_create_file("tx_status", 0400, e->subdir,
                                                dev, &txstat_fops);
        if (IS_ERR(e->dentry_txstat))
@@ -471,6 +513,7 @@ void b43legacy_debugfs_remove_device(str
                return;
        b43legacy_remove_dynamic_debug(dev);
        debugfs_remove(e->dentry_tsf);
+       debugfs_remove(e->dentry_ucode_regs);
        debugfs_remove(e->dentry_txstat);
        debugfs_remove(e->dentry_restart);
        debugfs_remove(e->dentry_power);
Index: wireless-dev/drivers/net/wireless/b43legacy/debugfs.h
===================================================================
--- wireless-dev.orig/drivers/net/wireless/b43legacy/debugfs.h
+++ wireless-dev/drivers/net/wireless/b43legacy/debugfs.h
@@ -32,6 +32,7 @@ struct b43legacy_txstatus_log {
 struct b43legacy_dfsentry {
        struct dentry *subdir;
        struct dentry *dentry_tsf;
+       struct dentry *dentry_ucode_regs;
        struct dentry *dentry_txstat;
        struct dentry *dentry_restart;
        struct dentry *dentry_power;
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