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>

diff --git a/drivers/media/video/zc0301/Kconfig b/drivers/media/video/zc0301/Kconfig
index 47cd93f..edb0029 100644 (file)
--- a/drivers/media/video/zc0301/Kconfig
+++ b/drivers/media/video/zc0301/Kconfig
@@ -1,6 +1,6 @@
 config USB_ZC0301
        tristate "USB ZC0301[P] Image Processor and Control Chip support"
-       depends on VIDEO_V4L1
+       depends on VIDEO_V4L2
        ---help---
          Say Y here if you want support for cameras based on the ZC0301 or
          ZC0301P Image Processors and Control Chips.

diff --git a/drivers/media/video/zc0301/zc0301.h b/drivers/media/video/zc0301/zc0301.h
index 710f12e..a2de50e 100644 (file)
--- 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 */

diff --git a/drivers/media/video/zc0301/zc0301_core.c b/drivers/media/video/zc0301/zc0301_core.c
index f112055..703b741 100644 (file)
--- a/drivers/media/video/zc0301/zc0301_core.c
+++ b/drivers/media/video/zc0301/zc0301_core.c
@@ -49,11 +49,11 @@
 
 #define ZC0301_MODULE_NAME    "V4L2 driver for ZC0301[P] "                    \
                              "Image Processor and Control Chip"
-#define ZC0301_MODULE_AUTHOR  "(C) 2006 Luca Risolia"
+#define ZC0301_MODULE_AUTHOR  "(C) 2006-2007 Luca Risolia"
 #define ZC0301_AUTHOR_EMAIL   "<luca.risolia@studio.unibo.it>"
 #define ZC0301_MODULE_LICENSE "GPL"
-#define ZC0301_MODULE_VERSION "1:1.07"
-#define ZC0301_MODULE_VERSION_CODE  KERNEL_VERSION(1, 1, 7)
+#define ZC0301_MODULE_VERSION "1:1.10"
+#define ZC0301_MODULE_VERSION_CODE  KERNEL_VERSION(1, 1, 10)
 
 /*****************************************************************************/
 
@@ -573,7 +573,8 @@ static int zc0301_init(struct zc0301_device* cam)
        int err = 0;
 
        if (!(cam->state & DEV_INITIALIZED)) {
-               init_waitqueue_head(&cam->open);
+               mutex_init(&cam->open_mutex);
+               init_waitqueue_head(&cam->wait_open);
                qctrl = s->qctrl;
                rect = &(s->cropcap.defrect);
                cam->compression.quality = ZC0301_COMPRESSION_QUALITY;
@@ -634,59 +635,73 @@ static int zc0301_init(struct zc0301_device* cam)
        return 0;
 }
 
+/*****************************************************************************/
 
-static void zc0301_release_resources(struct zc0301_device* cam)
+static void zc0301_release_resources(struct kref *kref)
 {
+       struct zc0301_device *cam = container_of(kref, struct zc0301_device,
+                                                kref);
        DBG(2, "V4L2 device /dev/video%d deregistered", cam->v4ldev->minor);
        video_set_drvdata(cam->v4ldev, NULL);
        video_unregister_device(cam->v4ldev);
+       usb_put_dev(cam->usbdev);
        kfree(cam->control_buffer);
+       kfree(cam);
 }
 
-/*****************************************************************************/
 
 static int zc0301_open(struct inode* inode, struct file* filp)
 {
        struct zc0301_device* cam;
        int err = 0;
 
-       /*
-          This is the only safe way to prevent race conditions with
-          disconnect
-       */
-       if (!down_read_trylock(&zc0301_disconnect))
+       if (!down_read_trylock(&zc0301_dev_lock))
                return -ERESTARTSYS;
 
        cam = video_get_drvdata(video_devdata(filp));
 
-       if (mutex_lock_interruptible(&cam->dev_mutex)) {
-               up_read(&zc0301_disconnect);
+       if (wait_for_completion_interruptible(&cam->probe)) {
+               up_read(&zc0301_dev_lock);
                return -ERESTARTSYS;
        }
 
+       kref_get(&cam->kref);
+
+       if (mutex_lock_interruptible(&cam->open_mutex)) {
+               kref_put(&cam->kref, zc0301_release_resources);
+               up_read(&zc0301_dev_lock);
+               return -ERESTARTSYS;
+       }
+
+       if (cam->state & DEV_DISCONNECTED) {
+               DBG(1, "Device not present");
+               err = -ENODEV;
+               goto out;
+       }
+
        if (cam->users) {
                DBG(2, "Device /dev/video%d is busy...", cam->v4ldev->minor);
+               DBG(3, "Simultaneous opens are not supported");
                if ((filp->f_flags & O_NONBLOCK) ||
                    (filp->f_flags & O_NDELAY)) {
                        err = -EWOULDBLOCK;
                        goto out;
                }
-               mutex_unlock(&cam->dev_mutex);
-               err = wait_event_interruptible_exclusive(cam->open,
-                                                 cam->state & DEV_DISCONNECTED
+               DBG(2, "A blocking open() has been requested. Wait for the "
+                      "device to be released...");
+               up_read(&zc0301_dev_lock);
+               err = wait_event_interruptible_exclusive(cam->wait_open,
+                                               (cam->state & DEV_DISCONNECTED)
                                                         || !cam->users);
-               if (err) {
-                       up_read(&zc0301_disconnect);
-                       return err;
-               }
+               down_read(&zc0301_dev_lock);
+               if (err)
+                       goto out;
                if (cam->state & DEV_DISCONNECTED) {
-                       up_read(&zc0301_disconnect);
-                       return -ENODEV;
+                       err = -ENODEV;
+                       goto out;
                }
-               mutex_lock(&cam->dev_mutex);
        }
 
-
        if (cam->state & DEV_MISCONFIGURED) {
                err = zc0301_init(cam);
                if (err) {
@@ -711,36 +726,32 @@ static int zc0301_open(struct inode* inode, struct file* filp)
        DBG(3, "Video device /dev/video%d is open", cam->v4ldev->minor);
 
 out:
-       mutex_unlock(&cam->dev_mutex);
-       up_read(&zc0301_disconnect);
+       mutex_unlock(&cam->open_mutex);
+       if (err)
+               kref_put(&cam->kref, zc0301_release_resources);
+       up_read(&zc0301_dev_lock);
        return err;
 }
 
 
 static int zc0301_release(struct inode* inode, struct file* filp)
 {
-       struct zc0301_device* cam = video_get_drvdata(video_devdata(filp));
+       struct zc0301_device* cam;
 
-       mutex_lock(&cam->dev_mutex); /* prevent disconnect() to be called */
+       down_write(&zc0301_dev_lock);
 
-       zc0301_stop_transfer(cam);
+       cam = video_get_drvdata(video_devdata(filp));
 
+       zc0301_stop_transfer(cam);
        zc0301_release_buffers(cam);
-
-       if (cam->state & DEV_DISCONNECTED) {
-               zc0301_release_resources(cam);
-               usb_put_dev(cam->usbdev);
-               mutex_unlock(&cam->dev_mutex);
-               kfree(cam);
-               return 0;
-       }
-
        cam->users--;
-       wake_up_interruptible_nr(&cam->open, 1);
+       wake_up_interruptible_nr(&cam->wait_open, 1);
 
        DBG(3, "Video device /dev/video%d closed", cam->v4ldev->minor);
 
-       mutex_unlock(&cam->dev_mutex);
+       kref_put(&cam->kref, zc0301_release_resources);
+
+       up_write(&zc0301_dev_lock);
 
        return 0;
 }
@@ -775,7 +786,7 @@ zc0301_read(struct file* filp, char __user * buf, size_t count, loff_t* f_pos)
                DBG(3, "Close and open the device again to choose the read "
                       "method");
                mutex_unlock(&cam->fileop_mutex);
-               return -EINVAL;
+               return -EBUSY;
        }
 
        if (cam->io == IO_NONE) {
@@ -953,7 +964,12 @@ static int zc0301_mmap(struct file* filp, struct vm_area_struct *vma)
                return -EIO;
        }
 
-       if (cam->io != IO_MMAP || !(vma->vm_flags & VM_WRITE) ||
+       if (!(vma->vm_flags & (VM_WRITE | VM_READ))) {
+               mutex_unlock(&cam->fileop_mutex);
+               return -EACCES;
+       }
+
+       if (cam->io != IO_MMAP ||
            size != PAGE_ALIGN(cam->frame[0].buf.length)) {
                mutex_unlock(&cam->fileop_mutex);
                return -EINVAL;
@@ -984,7 +1000,6 @@ static int zc0301_mmap(struct file* filp, struct vm_area_struct *vma)
 
        vma->vm_ops = &zc0301_vm_ops;
        vma->vm_private_data = &cam->frame[i];
-
        zc0301_vm_open(vma);
 
        mutex_unlock(&cam->fileop_mutex);
@@ -1211,7 +1226,7 @@ zc0301_vidioc_s_crop(struct zc0301_device* cam, void __user * arg)
                        if (cam->frame[i].vma_use_count) {
                                DBG(3, "VIDIOC_S_CROP failed. "
                                       "Unmap the buffers first.");
-                               return -EINVAL;
+                               return -EBUSY;
                        }
 
        if (!s->set_crop) {
@@ -1434,7 +1449,7 @@ zc0301_vidioc_try_s_fmt(struct zc0301_device* cam, unsigned int cmd,
                        if (cam->frame[i].vma_use_count) {
                                DBG(3, "VIDIOC_S_FMT failed. "
                                       "Unmap the buffers first.");
-                               return -EINVAL;
+                               return -EBUSY;
                        }
 
        if (cam->stream == STREAM_ON)
@@ -1544,14 +1559,14 @@ zc0301_vidioc_reqbufs(struct zc0301_device* cam, void __user * arg)
        if (cam->io == IO_READ) {
                DBG(3, "Close and open the device again to choose the mmap "
                       "I/O method");
-               return -EINVAL;
+               return -EBUSY;
        }
 
        for (i = 0; i < cam->nbuffers; i++)
                if (cam->frame[i].vma_use_count) {
                        DBG(3, "VIDIOC_REQBUFS failed. "
                               "Previous buffers are still mapped.");
-                       return -EINVAL;
+                       return -EBUSY;
                }
 
        if (cam->stream == STREAM_ON)
@@ -1699,9 +1714,6 @@ zc0301_vidioc_streamon(struct zc0301_device* cam, void __user * arg)
        if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE || cam->io != IO_MMAP)
                return -EINVAL;
 
-       if (list_empty(&cam->inqueue))
-               return -EINVAL;
-
        cam->stream = STREAM_ON;
 
        DBG(3, "Stream on");
@@ -1949,8 +1961,6 @@ zc0301_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
                goto fail;
        }
 
-       mutex_init(&cam->dev_mutex);
-
        DBG(2, "ZC0301[P] Image Processor and Control Chip detected "
               "(vid/pid 0x%04X:0x%04X)",id->idVendor, id->idProduct);
 
@@ -1982,7 +1992,7 @@ zc0301_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
        cam->v4ldev->release = video_device_release;
        video_set_drvdata(cam->v4ldev, cam);
 
-       mutex_lock(&cam->dev_mutex);
+       init_completion(&cam->probe);
 
        err = video_register_device(cam->v4ldev, VFL_TYPE_GRABBER,
                                    video_nr[dev_nr]);
@@ -1992,7 +2002,7 @@ zc0301_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
                        DBG(1, "Free /dev/videoX node not found");
                video_nr[dev_nr] = -1;
                dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0;
-               mutex_unlock(&cam->dev_mutex);
+               complete_all(&cam->probe);
                goto fail;
        }
 
@@ -2004,8 +2014,10 @@ zc0301_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
        dev_nr = (dev_nr < ZC0301_MAX_DEVICES-1) ? dev_nr+1 : 0;
 
        usb_set_intfdata(intf, cam);
+       kref_init(&cam->kref);
+       usb_get_dev(cam->usbdev);
 
-       mutex_unlock(&cam->dev_mutex);
+       complete_all(&cam->probe);
 
        return 0;
 
@@ -2022,40 +2034,31 @@ fail:
 
 static void zc0301_usb_disconnect(struct usb_interface* intf)
 {
-       struct zc0301_device* cam = usb_get_intfdata(intf);
-
-       if (!cam)
-               return;
+       struct zc0301_device* cam;
 
-       down_write(&zc0301_disconnect);
+       down_write(&zc0301_dev_lock);
 
-       mutex_lock(&cam->dev_mutex);
+       cam = usb_get_intfdata(intf);
 
        DBG(2, "Disconnecting %s...", cam->v4ldev->name);
 
-       wake_up_interruptible_all(&cam->open);
-
        if (cam->users) {
                DBG(2, "Device /dev/video%d is open! Deregistration and "
-                      "memory deallocation are deferred on close.",
+                      "memory deallocation are deferred.",
                    cam->v4ldev->minor);
                cam->state |= DEV_MISCONFIGURED;
                zc0301_stop_transfer(cam);
                cam->state |= DEV_DISCONNECTED;
                wake_up_interruptible(&cam->wait_frame);
                wake_up(&cam->wait_stream);
-               usb_get_dev(cam->usbdev);
-       } else {
+       } else
                cam->state |= DEV_DISCONNECTED;
-               zc0301_release_resources(cam);
-       }
 
-       mutex_unlock(&cam->dev_mutex);
+       wake_up_interruptible_all(&cam->wait_open);
 
-       if (!cam->users)
-               kfree(cam);
+       kref_put(&cam->kref, zc0301_release_resources);
 
-       up_write(&zc0301_disconnect);
+       up_write(&zc0301_dev_lock);
 }
 
 

diff --git a/drivers/media/video/zc0301/zc0301_pas202bcb.c b/drivers/media/video/zc0301/zc0301_pas202bcb.c
index 3efb92a..24b0dfb 100644 (file)
--- a/drivers/media/video/zc0301/zc0301_pas202bcb.c
+++ b/drivers/media/video/zc0301/zc0301_pas202bcb.c
@@ -327,6 +327,7 @@ static struct zc0301_sensor pas202bcb = {
                .height = 480,
                .pixelformat = V4L2_PIX_FMT_JPEG,
                .priv = 8,
+               .colorspace = V4L2_COLORSPACE_JPEG,
        },
 };
 

diff --git a/drivers/media/video/zc0301/zc0301_pb0330.c b/drivers/media/video/zc0301/zc0301_pb0330.c
index 5784b1d..9519aba 100644 (file)
--- a/drivers/media/video/zc0301/zc0301_pb0330.c
+++ b/drivers/media/video/zc0301/zc0301_pb0330.c
@@ -157,6 +157,7 @@ static struct zc0301_sensor pb0330 = {
                .height = 480,
                .pixelformat = V4L2_PIX_FMT_JPEG,
                .priv = 8,
+               .colorspace = V4L2_COLORSPACE_JPEG,
        },
 };
 

diff --git a/drivers/media/video/zc0301/zc0301_sensor.h b/drivers/media/video/zc0301/zc0301_sensor.h
index 44e82cf..70fe6fc 100644 (file)
--- a/drivers/media/video/zc0301/zc0301_sensor.h
+++ b/drivers/media/video/zc0301/zc0301_sensor.h
@@ -23,7 +23,7 @@
 #define _ZC0301_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>