[PATCH] USB: ZC0301 driver updates

"Cosmetic" driver updates for the ZC0301 driver:

- Fix stream_interrupt() (and work around a possible kernel bug);

- Fix vidioc_enum_input() and split vidioc_gs_input() in two parts;
- Use wait_event_interruptible_timeout() instead of wait_event_interruptible()
  when waiting for video frames;
- replace erroneous wake_up_interruptible(&wait_stream) with
  wake_up(&wait_stream);
- Cosmetic cleanups in the documentation.
Signed-off-by: Luca Risolia <luca.risolia@studio.unibo.it>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Documentation/usb/zc0301.txt

@@ -67,8 +67,7 @@ Some of the features of the driver are:
 - available mmap or read/poll methods for video streaming through isochronous
   data transfers;
 - automatic detection of image sensor;
-- video formats is standard JPEG in various compression qualities
-  (see also "Notes for V4L2 application developers" paragraph);
+- video format is standard JPEG;
 - full support for the capabilities of every possible image sensors that can
   be connected to the ZC0301 bridges, including, for istance, red, green,
   blue and global gain adjustments and exposure control (see "Supported
@@ -226,10 +225,6 @@ The same number of buffers as before will be allocated again to match the size
 of the new video frames, so you have to map the buffers again before any I/O
 attempts on them.
 
-This driver supports the standard JPEG video format. The current compression
-quality may vary from 0 to 3 and can be selected or queried thanks to the
-VIDIOC_S_JPEGCOMP and VIDIOC_G_JPEGCOMP V4L2 ioctl's.
-
 
 10. Contact information
 =======================
@@ -242,9 +237,9 @@ the fingerprint is: '88E8 F32F 7244 68BA 3958  5D40 99DA 5D2A FCE6 35A4'.
 
 11. Credits
 ===========
-- Informations about the chip internals to enable the I2C protocol have been
-  taken from the documentation of the ZC030x Video4Linux1 driver written by
-  Andrew Birkett <andy@nobugs.org>;
-- Initialization values of the ZC0301 connected to the PAS202BCB image sensor
-  have been taken from the SPCA5XX driver maintained by
-  Michel Xhaard  <mxhaard@magic.fr>
+- Informations about the chip internals needed to enable the I2C protocol have
+  been taken from the documentation of the ZC030x Video4Linux1 driver written
+  by Andrew Birkett <andy@nobugs.org>;
+- Initialization values of the ZC0301 controller connected to the PAS202BCB
+  image sensor have been taken from the SPCA5XX driver maintained by
+  Michel Xhaard <mxhaard@magic.fr>.

drivers/usb/media/zc0301.h

@@ -45,7 +45,7 @@
 #define ZC0301_MAX_DEVICES         64
 #define ZC0301_FORCE_MUNMAP        0
 #define ZC0301_MAX_FRAMES          32
-#define ZC0301_COMPRESSION_QUALITY 2
+#define ZC0301_COMPRESSION_QUALITY 0
 #define ZC0301_URBS                2
 #define ZC0301_ISO_PACKETS         7
 #define ZC0301_ALTERNATE_SETTING   7

drivers/usb/media/zc0301_core.c

@@ -3,9 +3,9 @@
  *                                                                         *
  * Copyright (C) 2006 by Luca Risolia <luca.risolia@studio.unibo.it>       *
  *                                                                         *
- * Informations about the chip internals to enable the I2C protocol have   *
- * been taken from the documentation of the ZC030x Video4Linux1 driver     *
- * written by Andrew Birkett <andy@nobugs.org>                             *
+ * Informations about the chip internals needed to enable the I2C protocol *
+ * have been taken from the documentation of the ZC030x Video4Linux1       *
+ * driver written by Andrew Birkett <andy@nobugs.org>                      *
  *                                                                         *
  * This program is free software; you can redistribute it and/or modify    *
  * it under the terms of the GNU General Public License as published by    *
@@ -54,8 +54,8 @@
 #define ZC0301_MODULE_AUTHOR  "(C) 2006 Luca Risolia"
 #define ZC0301_AUTHOR_EMAIL   "<luca.risolia@studio.unibo.it>"
 #define ZC0301_MODULE_LICENSE "GPL"
-#define ZC0301_MODULE_VERSION "1:1.00"
-#define ZC0301_MODULE_VERSION_CODE  KERNEL_VERSION(1, 0, 0)
+#define ZC0301_MODULE_VERSION "1:1.01"
+#define ZC0301_MODULE_VERSION_CODE  KERNEL_VERSION(1, 0, 1)
 
 /*****************************************************************************/
 
@@ -314,7 +314,7 @@ static void zc0301_urb_complete(struct urb *urb, struct pt_regs* regs)
 		if ((*f))
 			(*f)->state = F_QUEUED;
 		DBG(3, "Stream interrupted");
-		wake_up_interruptible(&cam->wait_stream);
+		wake_up(&cam->wait_stream);
 	}
 
 	if (cam->state & DEV_DISCONNECTED)
@@ -526,7 +526,7 @@ static int zc0301_stream_interrupt(struct zc0301_device* cam)
 	                             ZC0301_URB_TIMEOUT);
 	if (cam->state & DEV_DISCONNECTED)
 		return -ENODEV;
-	else if (!timeout) {
+	else if (cam->stream != STREAM_OFF) {
 		cam->state |= DEV_MISCONFIGURED;
 		DBG(1, "URB timeout reached. The camera is misconfigured. To "
 		       "use it, close and open /dev/video%d again.",
@@ -547,8 +547,7 @@ zc0301_set_compression(struct zc0301_device* cam,
 
 	if ((r = zc0301_read_reg(cam, 0x0008)) < 0)
 		err += r;
-	err += zc0301_write_reg(cam, 0x0008,
-	                        r | 0x11 | (compression->quality >> 1));
+	err += zc0301_write_reg(cam, 0x0008, r | 0x11 | compression->quality);
 
 	return err ? -EIO : 0;
 }
@@ -737,8 +736,7 @@ static int zc0301_release(struct inode* inode, struct file* filp)
 
 
 static ssize_t
-zc0301_read(struct file* filp, char __user * buf,
-              size_t count, loff_t* f_pos)
+zc0301_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
 {
 	struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
 	struct zc0301_frame_t* f, * i;
@@ -1019,6 +1017,7 @@ zc0301_vidioc_enuminput(struct zc0301_device* cam, void __user * arg)
 
 	memset(&i, 0, sizeof(i));
 	strcpy(i.name, "Camera");
+	i.type = V4L2_INPUT_TYPE_CAMERA;
 
 	if (copy_to_user(arg, &i, sizeof(i)))
 		return -EFAULT;
@@ -1028,7 +1027,19 @@ zc0301_vidioc_enuminput(struct zc0301_device* cam, void __user * arg)
 
 
 static int
-zc0301_vidioc_gs_input(struct zc0301_device* cam, void __user * arg)
+zc0301_vidioc_g_input(struct zc0301_device* cam, void __user * arg)
+{
+	int index = 0;
+
+	if (copy_to_user(arg, &index, sizeof(index)))
+		return -EFAULT;
+
+	return 0;
+}
+
+
+static int
+zc0301_vidioc_s_input(struct zc0301_device* cam, void __user * arg)
 {
 	int index;
 
@@ -1446,7 +1457,7 @@ zc0301_vidioc_s_jpegcomp(struct zc0301_device* cam, void __user * arg)
 	if (copy_from_user(&jc, arg, sizeof(jc)))
 		return -EFAULT;
 
-	if (jc.quality < 0 || jc.quality > 3)
+	if (jc.quality != 0)
 		return -EINVAL;
 
 	if (cam->stream == STREAM_ON)
@@ -1738,8 +1749,10 @@ static int zc0301_ioctl_v4l2(struct inode* inode, struct file* filp,
 		return zc0301_vidioc_enuminput(cam, arg);
 
 	case VIDIOC_G_INPUT:
+		return zc0301_vidioc_g_input(cam, arg);
+
 	case VIDIOC_S_INPUT:
-		return zc0301_vidioc_gs_input(cam, arg);
+		return zc0301_vidioc_s_input(cam, arg);
 
 	case VIDIOC_QUERYCTRL:
 		return zc0301_vidioc_query_ctrl(cam, arg);
@@ -1980,7 +1993,7 @@ static void zc0301_usb_disconnect(struct usb_interface* intf)
 		zc0301_stop_transfer(cam);
 		cam->state |= DEV_DISCONNECTED;
 		wake_up_interruptible(&cam->wait_frame);
-		wake_up_interruptible(&cam->wait_stream);
+		wake_up(&cam->wait_stream);
 	} else {
 		cam->state |= DEV_DISCONNECTED;
 		zc0301_release_resources(cam);

drivers/usb/media/zc0301_pas202bcb.c

@@ -318,7 +318,7 @@ static struct zc0301_sensor pas202bcb = {
 		.width = 640,
 		.height = 480,
 		.pixelformat = V4L2_PIX_FMT_JPEG,
-		.priv = 16,
+		.priv = 8,
 	},
 };