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V4L/DVB (5766): ET61x251 driver updates

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- 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 14:52:01 -03:00 committed by Mauro Carvalho Chehab
parent 3770be3419
commit 3b2ae0be9e
5 changed files with 120 additions and 104 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/media/video/et61x251/Kconfig
View File

@ -1,6 +1,6 @@
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.

23
drivers/media/video/et61x251/et61x251.h
View File

@ -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 */

189
drivers/media/video/et61x251/et61x251_core.c
View File

@ -45,11 +45,11 @@
#define ET61X251_MODULE_NAME "V4L2 driver for ET61X[12]51 " \
"PC Camera Controllers"
#define ET61X251_MODULE_AUTHOR "(C) 2006 Luca Risolia"
#define ET61X251_MODULE_AUTHOR "(C) 2006-2007 Luca Risolia"
#define ET61X251_AUTHOR_EMAIL "<luca.risolia@studio.unibo.it>"
#define ET61X251_MODULE_LICENSE "GPL"
#define ET61X251_MODULE_VERSION "1:1.04"
#define ET61X251_MODULE_VERSION_CODE KERNEL_VERSION(1, 1, 4)
#define ET61X251_MODULE_VERSION "1:1.09"
#define ET61X251_MODULE_VERSION_CODE KERNEL_VERSION(1, 1, 9)
/*****************************************************************************/
@ -245,7 +245,8 @@ int et61x251_read_reg(struct et61x251_device* cam, u16 index)
static int
et61x251_i2c_wait(struct et61x251_device* cam, struct et61x251_sensor* sensor)
et61x251_i2c_wait(struct et61x251_device* cam,
const struct et61x251_sensor* sensor)
{
int i, r;
@ -270,7 +271,7 @@ et61x251_i2c_wait(struct et61x251_device* cam, struct et61x251_sensor* sensor)
int
et61x251_i2c_try_read(struct et61x251_device* cam,
struct et61x251_sensor* sensor, u8 address)
const struct et61x251_sensor* sensor, u8 address)
{
struct usb_device* udev = cam->usbdev;
u8* data = cam->control_buffer;
@ -303,7 +304,8 @@ et61x251_i2c_try_read(struct et61x251_device* cam,
int
et61x251_i2c_try_write(struct et61x251_device* cam,
struct et61x251_sensor* sensor, u8 address, u8 value)
const struct et61x251_sensor* sensor, u8 address,
u8 value)
{
struct usb_device* udev = cam->usbdev;
u8* data = cam->control_buffer;
@ -615,7 +617,7 @@ static int et61x251_start_transfer(struct et61x251_device* cam)
return 0;
free_urbs:
for (i = 0; (i < ET61X251_URBS) && cam->urb[i]; i++)
for (i = 0; (i < ET61X251_URBS) && cam->urb[i]; i++)
usb_free_urb(cam->urb[i]);
free_buffers:
@ -682,7 +684,7 @@ static u8 et61x251_strtou8(const char* buff, size_t len, ssize_t* count)
if (len < 4) {
strncpy(str, buff, len);
str[len+1] = '\0';
str[len] = '\0';
} else {
strncpy(str, buff, 4);
str[4] = '\0';
@ -977,30 +979,30 @@ static CLASS_DEVICE_ATTR(i2c_val, S_IRUGO | S_IWUSR,
static int et61x251_create_sysfs(struct et61x251_device* cam)
{
struct video_device *v4ldev = cam->v4ldev;
struct class_device *classdev = &(cam->v4ldev->class_dev);
int err = 0;
if ((err = video_device_create_file(v4ldev, &class_device_attr_reg)))
if ((err = class_device_create_file(classdev, &class_device_attr_reg)))
goto err_out;
if ((err = video_device_create_file(v4ldev, &class_device_attr_val)))
if ((err = class_device_create_file(classdev, &class_device_attr_val)))
goto err_reg;
if (cam->sensor.sysfs_ops) {
if ((err = video_device_create_file(v4ldev,
if ((err = class_device_create_file(classdev,
&class_device_attr_i2c_reg)))
goto err_val;
if ((err = video_device_create_file(v4ldev,
if ((err = class_device_create_file(classdev,
&class_device_attr_i2c_val)))
goto err_i2c_reg;
}
err_i2c_reg:
if (cam->sensor.sysfs_ops)
video_device_remove_file(v4ldev, &class_device_attr_i2c_reg);
class_device_remove_file(classdev, &class_device_attr_i2c_reg);
err_val:
video_device_remove_file(v4ldev, &class_device_attr_val);
class_device_remove_file(classdev, &class_device_attr_val);
err_reg:
video_device_remove_file(v4ldev, &class_device_attr_reg);
class_device_remove_file(classdev, &class_device_attr_reg);
err_out:
return err;
}
@ -1103,7 +1105,8 @@ static int et61x251_init(struct et61x251_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 = ET61X251_COMPRESSION_QUALITY;
@ -1177,64 +1180,80 @@ static int et61x251_init(struct et61x251_device* cam)
return 0;
}
/*****************************************************************************/
static void et61x251_release_resources(struct et61x251_device* cam)
static void et61x251_release_resources(struct kref *kref)
{
struct et61x251_device *cam;
mutex_lock(&et61x251_sysfs_lock);
cam = container_of(kref, struct et61x251_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);
mutex_unlock(&et61x251_sysfs_lock);
kfree(cam->control_buffer);
}
/*****************************************************************************/
static int et61x251_open(struct inode* inode, struct file* filp)
{
struct et61x251_device* cam;
int err = 0;
/*
This is the only safe way to prevent race conditions with
disconnect
*/
if (!down_read_trylock(&et61x251_disconnect))
if (!down_read_trylock(&et61x251_dev_lock))
return -ERESTARTSYS;
cam = video_get_drvdata(video_devdata(filp));
if (mutex_lock_interruptible(&cam->dev_mutex)) {
up_read(&et61x251_disconnect);
if (wait_for_completion_interruptible(&cam->probe)) {
up_read(&et61x251_dev_lock);
return -ERESTARTSYS;
}
kref_get(&cam->kref);
if (mutex_lock_interruptible(&cam->open_mutex)) {
kref_put(&cam->kref, et61x251_release_resources);
up_read(&et61x251_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(2, "Device /dev/video%d is already in use",
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(&et61x251_dev_lock);
err = wait_event_interruptible_exclusive(cam->wait_open,
(cam->state & DEV_DISCONNECTED)
|| !cam->users);
if (err) {
up_read(&et61x251_disconnect);
return err;
}
down_read(&et61x251_dev_lock);
if (err)
goto out;
if (cam->state & DEV_DISCONNECTED) {
up_read(&et61x251_disconnect);
return -ENODEV;
err = -ENODEV;
goto out;
}
mutex_lock(&cam->dev_mutex);
}
if (cam->state & DEV_MISCONFIGURED) {
err = et61x251_init(cam);
if (err) {
@ -1259,36 +1278,32 @@ static int et61x251_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(&et61x251_disconnect);
mutex_unlock(&cam->open_mutex);
if (err)
kref_put(&cam->kref, et61x251_release_resources);
up_read(&et61x251_dev_lock);
return err;
}
static int et61x251_release(struct inode* inode, struct file* filp)
{
struct et61x251_device* cam = video_get_drvdata(video_devdata(filp));
struct et61x251_device* cam;
mutex_lock(&cam->dev_mutex); /* prevent disconnect() to be called */
down_write(&et61x251_dev_lock);
cam = video_get_drvdata(video_devdata(filp));
et61x251_stop_transfer(cam);
et61x251_release_buffers(cam);
if (cam->state & DEV_DISCONNECTED) {
et61x251_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, et61x251_release_resources);
up_write(&et61x251_dev_lock);
return 0;
}
@ -1324,7 +1339,7 @@ et61x251_read(struct file* filp, char __user * buf,
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) {
@ -1504,7 +1519,12 @@ static int et61x251_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;
@ -1535,7 +1555,6 @@ static int et61x251_mmap(struct file* filp, struct vm_area_struct *vma)
vma->vm_ops = &et61x251_vm_ops;
vma->vm_private_data = &cam->frame[i];
et61x251_vm_open(vma);
mutex_unlock(&cam->fileop_mutex);
@ -1764,7 +1783,7 @@ et61x251_vidioc_s_crop(struct et61x251_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;
}
/* Preserve R,G or B origin */
@ -1921,6 +1940,8 @@ et61x251_vidioc_g_fmt(struct et61x251_device* cam, void __user * arg)
if (format.type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
pfmt->colorspace = (pfmt->pixelformat == V4L2_PIX_FMT_ET61X251) ?
0 : V4L2_COLORSPACE_SRGB;
pfmt->bytesperline = (pfmt->pixelformat==V4L2_PIX_FMT_ET61X251)
? 0 : (pfmt->width * pfmt->priv) / 8;
pfmt->sizeimage = pfmt->height * ((pfmt->width*pfmt->priv)/8);
@ -1996,6 +2017,8 @@ et61x251_vidioc_try_s_fmt(struct et61x251_device* cam, unsigned int cmd,
pix->pixelformat != V4L2_PIX_FMT_SBGGR8)
pix->pixelformat = pfmt->pixelformat;
pix->priv = pfmt->priv; /* bpp */
pix->colorspace = (pix->pixelformat == V4L2_PIX_FMT_ET61X251) ?
0 : V4L2_COLORSPACE_SRGB;
pix->colorspace = pfmt->colorspace;
pix->bytesperline = (pix->pixelformat == V4L2_PIX_FMT_ET61X251)
? 0 : (pix->width * pix->priv) / 8;
@ -2013,7 +2036,7 @@ et61x251_vidioc_try_s_fmt(struct et61x251_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)
@ -2129,14 +2152,14 @@ et61x251_vidioc_reqbufs(struct et61x251_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)
@ -2284,9 +2307,6 @@ et61x251_vidioc_streamon(struct et61x251_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");
@ -2535,8 +2555,6 @@ et61x251_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
goto fail;
}
mutex_init(&cam->dev_mutex);
DBG(2, "ET61X[12]51 PC Camera Controller detected "
"(vid/pid 0x%04X:0x%04X)",id->idVendor, id->idProduct);
@ -2568,7 +2586,7 @@ et61x251_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]);
@ -2578,7 +2596,7 @@ et61x251_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 < ET61X251_MAX_DEVICES-1) ? dev_nr+1 : 0;
mutex_unlock(&cam->dev_mutex);
complete_all(&cam->probe);
goto fail;
}
@ -2599,11 +2617,15 @@ et61x251_usb_probe(struct usb_interface* intf, const struct usb_device_id* id)
"device controlling. Error #%d", err);
#else
DBG(2, "Optional device control through 'sysfs' interface disabled");
DBG(3, "Compile the kernel with the 'CONFIG_VIDEO_ADV_DEBUG' "
"configuration option to enable it.");
#endif
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;
@ -2620,40 +2642,31 @@ fail:
static void et61x251_usb_disconnect(struct usb_interface* intf)
{
struct et61x251_device* cam = usb_get_intfdata(intf);
struct et61x251_device* cam;
if (!cam)
return;
down_write(&et61x251_dev_lock);
down_write(&et61x251_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;
et61x251_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;
et61x251_release_resources(cam);
}
mutex_unlock(&cam->dev_mutex);
wake_up_interruptible_all(&cam->wait_open);
if (!cam->users)
kfree(cam);
kref_put(&cam->kref, et61x251_release_resources);
up_write(&et61x251_disconnect);
up_write(&et61x251_dev_lock);
}

8
drivers/media/video/et61x251/et61x251_sensor.h
View File

@ -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);

2
drivers/media/video/et61x251/et61x251_tas5130d1b.c
View File

@ -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,