V4L/DVB (5767): ZC0301 driver updates

- Make the driver depend on V4L2 only (KConfig)
- Better and safe locking mechanism of the device structure on open(), close()
  and disconnect()
- Use kref for handling device deallocation
- Generic cleanups

Signed-off-by: Luca Risolia <luca.risolia@studio.unibo.it>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 12 insertions, 9 deletions

diff --git a/drivers/media/video/zc0301/zc0301.h b/drivers/media/video/zc0301/zc0301.h
index 710f12eb9126..a2de50efa31a 100644
--- a/drivers/media/video/zc0301/zc0301.h
+++ b/drivers/media/video/zc0301/zc0301.h
@@ -36,6 +36,7 @@
 #include <linux/rwsem.h>
 #include <linux/stddef.h>
 #include <linux/string.h>
+#include <linux/kref.h>
 
 #include "zc0301_sensor.h"
 
@@ -98,7 +99,7 @@ struct zc0301_module_param {
         u16 frame_timeout;
 };
 
-static DECLARE_RWSEM(zc0301_disconnect);
+static DECLARE_RWSEM(zc0301_dev_lock);
 
 struct zc0301_device {
         struct video_device* v4ldev;
@@ -121,12 +122,14 @@ struct zc0301_device {
 
         struct zc0301_module_param module_param;
 
+        struct kref kref;
         enum zc0301_dev_state state;
         u8 users;
 
-        struct mutex dev_mutex, fileop_mutex;
+        struct completion probe;
+        struct mutex open_mutex, fileop_mutex;
         spinlock_t queue_lock;
-        wait_queue_head_t open, wait_frame, wait_stream;
+        wait_queue_head_t wait_open, wait_frame, wait_stream;
 };
 
 /*****************************************************************************/
@@ -156,8 +159,8 @@ do {                                                                          \
                 else if ((level) == 2)                                        \
                         dev_info(&cam->usbdev->dev, fmt "\n", ## args);       \
                 else if ((level) >= 3)                                        \
-                        dev_info(&cam->usbdev->dev, "[%s:%d] " fmt "\n",      \
-                                 __FUNCTION__, __LINE__ , ## args);           \
+                        dev_info(&cam->usbdev->dev, "[%s:%s:%d] " fmt "\n",   \
+                                 __FILE__, __FUNCTION__, __LINE__ , ## args); \
         }                                                                     \
 } while (0)
 #       define KDBG(level, fmt, args...)                                      \
@@ -166,8 +169,8 @@ do {                                                                          \
                 if ((level) == 1 || (level) == 2)                             \
                         pr_info("zc0301: " fmt "\n", ## args);                \
                 else if ((level) == 3)                                        \
-                        pr_debug("zc0301: [%s:%d] " fmt "\n", __FUNCTION__,   \
-                                 __LINE__ , ## args);                         \
+                        pr_debug("sn9c102: [%s:%s:%d] " fmt "\n", __FILE__,   \
+                                 __FUNCTION__, __LINE__ , ## args);           \
         }                                                                     \
 } while (0)
 #       define V4LDBG(level, name, cmd)                                       \
@@ -183,8 +186,8 @@ do {                                                                          \
 
 #undef PDBG
 #define PDBG(fmt, args...)                                                    \
-dev_info(&cam->usbdev->dev, "[%s:%d] " fmt "\n",                              \
-         __FUNCTION__, __LINE__ , ## args)
+dev_info(&cam->usbdev->dev, "[%s:%s:%d] " fmt "\n", __FILE__, __FUNCTION__,   \
+         __LINE__ , ## args)
 
 #undef PDBGG
 #define PDBGG(fmt, args...) do {;} while(0) /* placeholder */