[PATCH] bcm43xx: ucode debug status via sysfs

This patch prints out the ucode debug status to sysfs. So, users can
watch the microcode status of their hardware.

Signed-off-by: Martin Langer <martin-langer@gmx.de>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/bcm43xx/bcm43xx.h

@@ -311,6 +311,7 @@
 #define BCM43xx_UCODE_PATCHLEVEL	0x0002
 #define BCM43xx_UCODE_DATE		0x0004
 #define BCM43xx_UCODE_TIME		0x0006
+#define BCM43xx_UCODE_STATUS		0x0040
 
 /* MicrocodeFlagsBitfield (addr + lo-word values?)*/
 #define BCM43xx_UCODEFLAGS_OFFSET	0x005E

drivers/net/wireless/bcm43xx/bcm43xx_sysfs.c

@@ -376,6 +376,59 @@ static DEVICE_ATTR(phymode, 0644,
 		   bcm43xx_attr_phymode_show,
 		   bcm43xx_attr_phymode_store);
 
+static ssize_t bcm43xx_attr_microcode_show(struct device *dev,
+					   struct device_attribute *attr,
+					   char *buf)
+{
+	unsigned long flags;
+	struct bcm43xx_private *bcm = dev_to_bcm(dev);
+	ssize_t count = 0;
+	u16 status;
+
+	if (!capable(CAP_NET_ADMIN))
+		return -EPERM;
+
+	mutex_lock(&(bcm)->mutex);
+	spin_lock_irqsave(&bcm->irq_lock, flags);
+	status = bcm43xx_shm_read16(bcm, BCM43xx_SHM_SHARED,
+				    BCM43xx_UCODE_STATUS);
+
+	spin_unlock_irqrestore(&bcm->irq_lock, flags);
+	mutex_unlock(&(bcm)->mutex);
+	switch (status) {
+	case 0x0000:
+		count = snprintf(buf, PAGE_SIZE, "0x%.4x (invalid)\n",
+				 status);
+		break;
+	case 0x0001:
+		count = snprintf(buf, PAGE_SIZE, "0x%.4x (init)\n",
+				 status);
+		break;
+	case 0x0002:
+		count = snprintf(buf, PAGE_SIZE, "0x%.4x (active)\n",
+				 status);
+		break;
+	case 0x0003:
+		count = snprintf(buf, PAGE_SIZE, "0x%.4x (suspended)\n",
+				 status);
+		break;
+	case 0x0004:
+		count = snprintf(buf, PAGE_SIZE, "0x%.4x (asleep)\n",
+				 status);
+		break;
+	default:
+		count = snprintf(buf, PAGE_SIZE, "0x%.4x (unknown)\n",
+				 status);
+		break;
+	}
+
+	return count;
+}
+
+static DEVICE_ATTR(microcodestatus, 0444,
+		   bcm43xx_attr_microcode_show,
+		   NULL);
+
 int bcm43xx_sysfs_register(struct bcm43xx_private *bcm)
 {
 	struct device *dev = &bcm->pci_dev->dev;
@@ -395,9 +448,14 @@ int bcm43xx_sysfs_register(struct bcm43xx_private *bcm)
 	err = device_create_file(dev, &dev_attr_phymode);
 	if (err)
 		goto err_remove_shortpreamble;
+	err = device_create_file(dev, &dev_attr_microcodestatus);
+	if (err)
+		goto err_remove_phymode;
 
 out:
 	return err;
+err_remove_phymode:
+	device_remove_file(dev, &dev_attr_phymode);
 err_remove_shortpreamble:
 	device_remove_file(dev, &dev_attr_shortpreamble);
 err_remove_interfmode:
@@ -411,6 +469,7 @@ void bcm43xx_sysfs_unregister(struct bcm43xx_private *bcm)
 {
 	struct device *dev = &bcm->pci_dev->dev;
 
+	device_remove_file(dev, &dev_attr_microcodestatus);
 	device_remove_file(dev, &dev_attr_phymode);
 	device_remove_file(dev, &dev_attr_shortpreamble);
 	device_remove_file(dev, &dev_attr_interference);