V4L/DVB (5766): ET61x251 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>

drivers/media/video/et61x251/Kconfig

 config USB_ET61X251
 	tristate "USB ET61X[12]51 PC Camera Controller support"
-	depends on VIDEO_V4L1
+	depends on VIDEO_V4L2
 	---help---
 	  Say Y here if you want support for cameras based on Etoms ET61X151
 	  or ET61X251 PC Camera Controllers.

drivers/media/video/et61x251/et61x251.h

@@ -36,6 +36,7 @@
 #include <linux/mutex.h>
 #include <linux/stddef.h>
 #include <linux/string.h>
+#include <linux/kref.h>
 
 #include "et61x251_sensor.h"
 
@@ -134,7 +135,7 @@ struct et61x251_module_param {
 };
 
 static DEFINE_MUTEX(et61x251_sysfs_lock);
-static DECLARE_RWSEM(et61x251_disconnect);
+static DECLARE_RWSEM(et61x251_dev_lock);
 
 struct et61x251_device {
 	struct video_device* v4ldev;
@@ -158,12 +159,14 @@ struct et61x251_device {
 	struct et61x251_sysfs_attr sysfs;
 	struct et61x251_module_param module_param;
 
+	struct kref kref;
 	enum et61x251_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;
 };
 
 /*****************************************************************************/
@@ -177,7 +180,7 @@ et61x251_match_id(struct et61x251_device* cam, const struct usb_device_id *id)
 
 void
 et61x251_attach_sensor(struct et61x251_device* cam,
-		       struct et61x251_sensor* sensor)
+		       const struct et61x251_sensor* sensor)
 {
 	memcpy(&cam->sensor, sensor, sizeof(struct et61x251_sensor));
 }
@@ -195,8 +198,8 @@ 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...)                                      \
@@ -205,8 +208,8 @@ do {                                                                          \
 		if ((level) == 1 || (level) == 2)                             \
 			pr_info("et61x251: " fmt "\n", ## args);              \
 		else if ((level) == 3)                                        \
-			pr_debug("et61x251: [%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)                                       \
@@ -222,8 +225,8 @@ 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 */

drivers/media/video/et61x251/et61x251_sensor.h

@@ -22,7 +22,7 @@
 #define _ET61X251_SENSOR_H_
 
 #include <linux/usb.h>
-#include <linux/videodev.h>
+#include <linux/videodev2.h>
 #include <linux/device.h>
 #include <linux/stddef.h>
 #include <linux/errno.h>
@@ -47,7 +47,7 @@ et61x251_match_id(struct et61x251_device* cam, const struct usb_device_id *id);
 
 extern void
 et61x251_attach_sensor(struct et61x251_device* cam,
-		       struct et61x251_sensor* sensor);
+		       const struct et61x251_sensor* sensor);
 
 /*****************************************************************************/
 
@@ -56,10 +56,10 @@ extern int et61x251_read_reg(struct et61x251_device*, u16 index);
 extern int et61x251_i2c_write(struct et61x251_device*, u8 address, u8 value);
 extern int et61x251_i2c_read(struct et61x251_device*, u8 address);
 extern int et61x251_i2c_try_write(struct et61x251_device*,
-				  struct et61x251_sensor*, u8 address,
+				  const struct et61x251_sensor*, u8 address,
 				  u8 value);
 extern int et61x251_i2c_try_read(struct et61x251_device*,
-				 struct et61x251_sensor*, u8 address);
+				 const struct et61x251_sensor*, u8 address);
 extern int et61x251_i2c_raw_write(struct et61x251_device*, u8 n, u8 data1,
 				  u8 data2, u8 data3, u8 data4, u8 data5,
 				  u8 data6, u8 data7, u8 data8, u8 address);

drivers/media/video/et61x251/et61x251_tas5130d1b.c

@@ -69,7 +69,7 @@ static int tas5130d1b_set_ctrl(struct et61x251_device* cam,
 }
 
 
-static struct et61x251_sensor tas5130d1b = {
+static const struct et61x251_sensor tas5130d1b = {
 	.name = "TAS5130D1B",
 	.interface = ET61X251_I2C_3WIRES,
 	.rsta = ET61X251_I2C_RSTA_STOP,