[PATCH] USB: ET61X[12]51 driver updates

USB: ET61X[12]51 driver updates

Changes: + new, - removed, * cleanup, @ bugfix

@ Fix stream_interrupt()
@ Fix vidioc_enum_input() and split vidioc_gs_input()
@ Need usb_get|put_dev() when disconnecting, if the device is open
* Use wait_event_interruptible_timeout() instead of wait_event_interruptible()
  when waiting for video frames
* replace wake_up_interruptible(&wait_stream) with wake_up(&wait_stream)
* Cleanups and updates in the documentation
* Use mutexes instead of semaphores
+ Use per-device sensor structures
+ Add support for PAS202BCA image sensors
+ Add frame_timeout module parameter

Signed-off-by: Luca Risolia <luca.risolia@studio.unibo.it>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Documentation/usb/et61x251.txt

@@ -176,6 +176,14 @@ Description:    Force the application to unmap previously mapped buffer memory
                 1 = force memory unmapping (save memory)
 Default:        0
 -------------------------------------------------------------------------------
+Name:           frame_timeout
+Type:           uint array (min = 0, max = 64)
+Syntax:         <n[,...]>
+Description:    Timeout for a video frame in seconds. This parameter is
+                specific for each detected camera. This parameter can be
+                changed at runtime thanks to the /sys filesystem interface.
+Default:        2
+-------------------------------------------------------------------------------
 Name:           debug
 Type:           ushort
 Syntax:         <n>
@@ -266,7 +274,7 @@ the V4L2 interface.
 
 
 10. Notes for V4L2 application developers
-========================================
+=========================================
 This driver follows the V4L2 API specifications. In particular, it enforces two
 rules:
 

drivers/usb/media/et61x251.h

@@ -33,7 +33,9 @@
 #include <linux/types.h>
 #include <linux/param.h>
 #include <linux/rwsem.h>
-#include <asm/semaphore.h>
+#include <linux/mutex.h>
+#include <linux/stddef.h>
+#include <linux/string.h>
 
 #include "et61x251_sensor.h"
 
@@ -51,6 +53,7 @@
 #define ET61X251_ALTERNATE_SETTING   13
 #define ET61X251_URB_TIMEOUT         msecs_to_jiffies(2 * ET61X251_ISO_PACKETS)
 #define ET61X251_CTRL_TIMEOUT        100
+#define ET61X251_FRAME_TIMEOUT       2
 
 /*****************************************************************************/
 
@@ -127,15 +130,16 @@ struct et61x251_sysfs_attr {
 
 struct et61x251_module_param {
 	u8 force_munmap;
+	u16 frame_timeout;
 };
 
-static DECLARE_MUTEX(et61x251_sysfs_lock);
+static DEFINE_MUTEX(et61x251_sysfs_lock);
 static DECLARE_RWSEM(et61x251_disconnect);
 
 struct et61x251_device {
 	struct video_device* v4ldev;
 
-	struct et61x251_sensor* sensor;
+	struct et61x251_sensor sensor;
 
 	struct usb_device* usbdev;
 	struct urb* urb[ET61X251_URBS];
@@ -157,19 +161,28 @@ struct et61x251_device {
 	enum et61x251_dev_state state;
 	u8 users;
 
-	struct semaphore dev_sem, fileop_sem;
+	struct mutex dev_mutex, fileop_mutex;
 	spinlock_t queue_lock;
 	wait_queue_head_t open, wait_frame, wait_stream;
 };
 
 /*****************************************************************************/
 
+struct et61x251_device*
+et61x251_match_id(struct et61x251_device* cam, const struct usb_device_id *id)
+{
+	if (usb_match_id(usb_ifnum_to_if(cam->usbdev, 0), id))
+		return cam;
+
+	return NULL;
+}
+
+
 void
 et61x251_attach_sensor(struct et61x251_device* cam,
                        struct et61x251_sensor* sensor)
 {
-	cam->sensor = sensor;
-	cam->sensor->usbdev = cam->usbdev;
+	memcpy(&cam->sensor, sensor, sizeof(struct et61x251_sensor));
 }
 
 /*****************************************************************************/
@@ -212,7 +225,8 @@ do {                                                                          \
 
 #undef PDBG
 #define PDBG(fmt, args...)                                                    \
-dev_info(&cam->dev, "[%s:%d] " fmt "\n", __FUNCTION__, __LINE__ , ## args)
+dev_info(&cam->usbdev->dev, "[%s:%d] " fmt "\n",                              \
+         __FUNCTION__, __LINE__ , ## args)
 
 #undef PDBGG
 #define PDBGG(fmt, args...) do {;} while(0) /* placeholder */

drivers/usb/media/et61x251_sensor.h

@@ -42,6 +42,9 @@ static int (*et61x251_sensor_table[])(struct et61x251_device*) = {            \
 	NULL,                                                                 \
 };
 
+extern struct et61x251_device*
+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);
@@ -105,8 +108,6 @@ struct et61x251_sensor {
 	int (*set_pix_format)(struct et61x251_device* cam,
 	                      const struct v4l2_pix_format* pix);
 
-	const struct usb_device* usbdev;
-
 	/* Private */
 	struct v4l2_queryctrl _qctrl[ET61X251_MAX_CTRLS];
 	struct v4l2_rect _rect;

drivers/usb/media/et61x251_tas5130d1b.c

@@ -126,12 +126,16 @@ static struct et61x251_sensor tas5130d1b = {
 
 int et61x251_probe_tas5130d1b(struct et61x251_device* cam)
 {
-	/* This sensor has no identifiers, so let's attach it anyway */
-	et61x251_attach_sensor(cam, &tas5130d1b);
+	const struct usb_device_id tas5130d1b_id_table[] = {
+		{ USB_DEVICE(0x102c, 0x6251), },
+		{ }
+	};
 
 	/* Sensor detection is based on USB pid/vid */
-	if (le16_to_cpu(tas5130d1b.usbdev->descriptor.idProduct) != 0x6251)
+	if (!et61x251_match_id(cam, tas5130d1b_id_table))
 		return -ENODEV;
 
+	et61x251_attach_sensor(cam, &tas5130d1b);
+
 	return 0;
 }