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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>
This commit is contained in:
Luca Risolia 2007-06-13 15:11:15 -03:00 коммит произвёл Mauro Carvalho Chehab
Родитель 3b2ae0be9e
Коммит 4052fcc7ba
6 изменённых файлов: 91 добавлений и 83 удалений
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2
drivers/media/video/zc0301/Kconfig
Просмотреть файл

@ -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.

21
drivers/media/video/zc0301/zc0301.h
Просмотреть файл

@ -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 */

147
drivers/media/video/zc0301/zc0301_core.c
Просмотреть файл

@ -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);
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);
struct zc0301_device* cam;
if (!cam)
return;
down_write(&zc0301_dev_lock);
down_write(&zc0301_disconnect);
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);
}

1
drivers/media/video/zc0301/zc0301_pas202bcb.c
Просмотреть файл

@ -327,6 +327,7 @@ static struct zc0301_sensor pas202bcb = {
.height = 480,
.pixelformat = V4L2_PIX_FMT_JPEG,
.priv = 8,
.colorspace = V4L2_COLORSPACE_JPEG,
},
};

1
drivers/media/video/zc0301/zc0301_pb0330.c
Просмотреть файл

@ -157,6 +157,7 @@ static struct zc0301_sensor pb0330 = {
.height = 480,
.pixelformat = V4L2_PIX_FMT_JPEG,
.priv = 8,
.colorspace = V4L2_COLORSPACE_JPEG,
},
};

2
drivers/media/video/zc0301/zc0301_sensor.h
Просмотреть файл

@ -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>