b43: Add mask/set capability to debugfs MMIO interface

This adds an atomic mask/set capability to the debugfs MMIO interface.
This is needed to support mask and/or set operations from the userspace
debugging tools.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 30 insertions, 8 deletions

diff --git a/drivers/net/wireless/b43/debugfs.c b/drivers/net/wireless/b43/debugfs.c
index dd40ad826c78..cfe8e202e4c3 100644
--- a/drivers/net/wireless/b43/debugfs.c
+++ b/drivers/net/wireless/b43/debugfs.c
@@ -267,6 +267,8 @@ static int mmio16read__write_file(struct b43_wldev *dev,
                 return -EINVAL;
         if (addr > B43_MAX_MMIO_ACCESS)
                 return -EADDRNOTAVAIL;
+        if ((addr % 2) != 0)
+                return -EINVAL;
 
         dev->dfsentry->mmio16read_next = addr;
 
@@ -276,17 +278,26 @@ static int mmio16read__write_file(struct b43_wldev *dev,
 static int mmio16write__write_file(struct b43_wldev *dev,
                                    const char *buf, size_t count)
 {
-        unsigned int addr, val;
+        unsigned int addr, mask, set;
         int res;
+        u16 val;
 
-        res = sscanf(buf, "0x%X = 0x%X", &addr, &val);
-        if (res != 2)
+        res = sscanf(buf, "0x%X 0x%X 0x%X", &addr, &mask, &set);
+        if (res != 3)
                 return -EINVAL;
         if (addr > B43_MAX_MMIO_ACCESS)
                 return -EADDRNOTAVAIL;
-        if (val > 0xFFFF)
+        if ((mask > 0xFFFF) || (set > 0xFFFF))
                 return -E2BIG;
+        if ((addr % 2) != 0)
+                return -EINVAL;
 
+        if (mask == 0)
+                val = 0;
+        else
+                val = b43_read16(dev, addr);
+        val &= mask;
+        val |= set;
         b43_write16(dev, addr, val);
 
         return 0;
@@ -320,6 +331,8 @@ static int mmio32read__write_file(struct b43_wldev *dev,
                 return -EINVAL;
         if (addr > B43_MAX_MMIO_ACCESS)
                 return -EADDRNOTAVAIL;
+        if ((addr % 4) != 0)
+                return -EINVAL;
 
         dev->dfsentry->mmio32read_next = addr;
 
@@ -329,17 +342,26 @@ static int mmio32read__write_file(struct b43_wldev *dev,
 static int mmio32write__write_file(struct b43_wldev *dev,
                                    const char *buf, size_t count)
 {
-        unsigned int addr, val;
+        unsigned int addr, mask, set;
         int res;
+        u32 val;
 
-        res = sscanf(buf, "0x%X = 0x%X", &addr, &val);
-        if (res != 2)
+        res = sscanf(buf, "0x%X 0x%X 0x%X", &addr, &mask, &set);
+        if (res != 3)
                 return -EINVAL;
         if (addr > B43_MAX_MMIO_ACCESS)
                 return -EADDRNOTAVAIL;
-        if (val > 0xFFFFFFFF)
+        if ((mask > 0xFFFFFFFF) || (set > 0xFFFFFFFF))
                 return -E2BIG;
+        if ((addr % 4) != 0)
+                return -EINVAL;
 
+        if (mask == 0)
+                val = 0;
+        else
+                val = b43_read32(dev, addr);
+        val &= mask;
+        val |= set;
         b43_write32(dev, addr, val);
 
         return 0;