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Commit c0c4c893 authored by Jean-Francois Moine's avatar Jean-Francois Moine Committed by Mauro Carvalho Chehab
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V4L/DVB (11220): gspca - finepix: Use a workqueue for streaming. 

Tested-by: default avatarFrank Zago <frank@zago.net>
Acked-by: default avatarFrank Zago <frank@zago.net>
Signed-off-by: default avatarJean-Francois Moine <moinejf@free.fr>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 67e45425
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Showing with 134 additions and 287 deletions
drivers/media/video/gspca/finepix.c
View file @ c0c4c893
......@@ -27,7 +27,7 @@ MODULE_DESCRIPTION("Fujifilm FinePix USB V4L2 driver");
MODULE_LICENSE("GPL");
/* Default timeout, in ms */
#define FPIX_TIMEOUT (HZ / 10)
#define FPIX_TIMEOUT 250
/* Maximum transfer size to use. The windows driver reads by chunks of
* 0x2000 bytes, so do the same. Note: reading more seems to work
......@@ -38,38 +38,15 @@ MODULE_LICENSE("GPL");
struct usb_fpix {
struct gspca_dev gspca_dev; /* !! must be the first item */
/*
* USB stuff
*/
struct usb_ctrlrequest ctrlreq;
struct urb *control_urb;
struct timer_list bulk_timer;
enum {
FPIX_NOP, /* inactive, else streaming */
FPIX_RESET, /* must reset */
FPIX_REQ_FRAME, /* requesting a frame */
FPIX_READ_FRAME, /* reading frame */
} state;
/*
* Driver stuff
*/
struct delayed_work wqe;
struct completion can_close;
int streaming;
struct work_struct work_struct;
struct workqueue_struct *work_thread;
};
/* Delay after which claim the next frame. If the delay is too small,
* the camera will return old frames. On the 4800Z, 20ms is bad, 25ms
* will fail every 4 or 5 frames, but 30ms is perfect. */
#define NEXT_FRAME_DELAY (((HZ * 30) + 999) / 1000)
#define dev_new_state(new_state) { \
PDEBUG(D_STREAM, "new state from %d to %d at %s:%d", \
dev->state, new_state, __func__, __LINE__); \
dev->state = new_state; \
}
* will fail every 4 or 5 frames, but 30ms is perfect. On the A210,
* 30ms is bad while 35ms is perfect. */
#define NEXT_FRAME_DELAY 35
/* These cameras only support 320x200. */
static const struct v4l2_pix_format fpix_mode[1] = {
......@@ -80,80 +57,88 @@ static const struct v4l2_pix_format fpix_mode[1] = {
.priv = 0}
};
/* Reads part of a frame */
static void read_frame_part(struct usb_fpix *dev)
/* send a command to the webcam */
static int command(struct gspca_dev *gspca_dev,
int order) /* 0: reset, 1: frame request */
{
int ret;
static u8 order_values[2][12] = {
{0xc6, 0, 0, 0, 0, 0, 0, 0, 0x20, 0, 0, 0}, /* reset */
{0xd3, 0, 0, 0, 0, 0, 0, 0x01, 0, 0, 0, 0}, /* fr req */
};
PDEBUG(D_STREAM, "read_frame_part");
/* Reads part of a frame */
ret = usb_submit_urb(dev->gspca_dev.urb[0], GFP_ATOMIC);
if (ret) {
dev_new_state(FPIX_RESET);
schedule_delayed_work(&dev->wqe, 1);
PDEBUG(D_STREAM, "usb_submit_urb failed with %d",
ret);
} else {
/* Sometimes we never get a callback, so use a timer.
* Is this masking a bug somewhere else? */
dev->bulk_timer.expires = jiffies + msecs_to_jiffies(150);
add_timer(&dev->bulk_timer);
}
memcpy(gspca_dev->usb_buf, order_values[order], 12);
return usb_control_msg(gspca_dev->dev,
usb_sndctrlpipe(gspca_dev->dev, 0),
USB_REQ_GET_STATUS,
USB_DIR_OUT | USB_TYPE_CLASS |
USB_RECIP_INTERFACE, 0, 0, gspca_dev->usb_buf,
12, FPIX_TIMEOUT);
}
/* Callback for URBs. */
static void urb_callback(struct urb *urb)
/* workqueue */
static void dostream(struct work_struct *work)
{
struct gspca_dev *gspca_dev = urb->context;
struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
PDEBUG(D_PACK,
"enter urb_callback - status=%d, length=%d",
urb->status, urb->actual_length);
if (dev->state == FPIX_READ_FRAME)
del_timer(&dev->bulk_timer);
if (urb->status != 0) {
/* We kill a stuck urb every 50 frames on average, so don't
* display a log message for that. */
if (urb->status != -ECONNRESET)
PDEBUG(D_STREAM, "bad URB status %d", urb->status);
dev_new_state(FPIX_RESET);
schedule_delayed_work(&dev->wqe, 1);
}
switch (dev->state) {
case FPIX_REQ_FRAME:
dev_new_state(FPIX_READ_FRAME);
read_frame_part(dev);
break;
case FPIX_READ_FRAME: {
unsigned char *data = urb->transfer_buffer;
struct usb_fpix *dev = container_of(work, struct usb_fpix, work_struct);
struct gspca_dev *gspca_dev = &dev->gspca_dev;
struct urb *urb = gspca_dev->urb[0];
u8 *data = urb->transfer_buffer;
struct gspca_frame *frame;
int ret = 0;
int len;
/* synchronize with the main driver */
mutex_lock(&gspca_dev->usb_lock);
mutex_unlock(&gspca_dev->usb_lock);
PDEBUG(D_STREAM, "dostream started");
/* loop reading a frame */
again:
while (gspca_dev->present && gspca_dev->streaming) {
/* request a frame */
mutex_lock(&gspca_dev->usb_lock);
ret = command(gspca_dev, 1);
mutex_unlock(&gspca_dev->usb_lock);
if (ret < 0)
break;
if (!gspca_dev->present || !gspca_dev->streaming)
break;
/* the frame comes in parts */
for (;;) {
ret = usb_bulk_msg(gspca_dev->dev,
urb->pipe,
data,
FPIX_MAX_TRANSFER,
&len, FPIX_TIMEOUT);
if (ret < 0) {
/* Most of the time we get a timeout
* error. Just restart. */
goto again;
}
if (!gspca_dev->present || !gspca_dev->streaming)
goto out;
frame = gspca_get_i_frame(&dev->gspca_dev);
if (frame == NULL)
gspca_dev->last_packet_type = DISCARD_PACKET;
if (urb->actual_length < FPIX_MAX_TRANSFER ||
(data[urb->actual_length-2] == 0xff &&
data[urb->actual_length-1] == 0xd9)) {
if (len < FPIX_MAX_TRANSFER ||
(data[len - 2] == 0xff &&
data[len - 1] == 0xd9)) {
/* If the result is less than what was asked
* for, then it's the end of the
* frame. Sometime the jpeg is not complete,
* frame. Sometimes the jpeg is not complete,
* but there's nothing we can do. We also end
* here if the the jpeg ends right at the end
* of the frame. */
if (frame)
gspca_frame_add(gspca_dev, LAST_PACKET,
frame = gspca_frame_add(gspca_dev,
LAST_PACKET,
frame,
data, urb->actual_length);
dev_new_state(FPIX_REQ_FRAME);
schedule_delayed_work(&dev->wqe, NEXT_FRAME_DELAY);
} else {
data, len);
break;
}
/* got a partial image */
if (frame)
......@@ -161,233 +146,94 @@ static void urb_callback(struct urb *urb)
gspca_dev->last_packet_type
== LAST_PACKET
? FIRST_PACKET : INTER_PACKET,
frame,
data, urb->actual_length);
read_frame_part(dev);
}
break;
frame, data, len);
}
case FPIX_NOP:
case FPIX_RESET:
PDEBUG(D_STREAM, "invalid state %d", dev->state);
break;
/* We must wait before trying reading the next
* frame. If we don't, or if the delay is too short,
* the camera will disconnect. */
msleep(NEXT_FRAME_DELAY);
}
}
/* Request a new frame */
static void request_frame(struct usb_fpix *dev)
{
int ret;
struct gspca_dev *gspca_dev = &dev->gspca_dev;
/* Setup command packet */
memset(gspca_dev->usb_buf, 0, 12);
gspca_dev->usb_buf[0] = 0xd3;
gspca_dev->usb_buf[7] = 0x01;
/* Request a frame */
dev->ctrlreq.bRequestType =
USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE;
dev->ctrlreq.bRequest = USB_REQ_GET_STATUS;
dev->ctrlreq.wValue = 0;
dev->ctrlreq.wIndex = 0;
dev->ctrlreq.wLength = cpu_to_le16(12);
usb_fill_control_urb(dev->control_urb,
gspca_dev->dev,
usb_sndctrlpipe(gspca_dev->dev, 0),
(unsigned char *) &dev->ctrlreq,
gspca_dev->usb_buf,
12, urb_callback, gspca_dev);
ret = usb_submit_urb(dev->control_urb, GFP_ATOMIC);
if (ret) {
dev_new_state(FPIX_RESET);
schedule_delayed_work(&dev->wqe, 1);
PDEBUG(D_STREAM, "usb_submit_urb failed with %d", ret);
}
}
/*--------------------------------------------------------------------------*/
/* State machine. */
static void fpix_sm(struct work_struct *work)
{
struct usb_fpix *dev = container_of(work, struct usb_fpix, wqe.work);
PDEBUG(D_STREAM, "fpix_sm state %d", dev->state);
/* verify that the device wasn't unplugged */
if (!dev->gspca_dev.present) {
PDEBUG(D_STREAM, "device is gone");
dev_new_state(FPIX_NOP);
complete(&dev->can_close);
return;
}
if (!dev->streaming) {
PDEBUG(D_STREAM, "stopping state machine");
dev_new_state(FPIX_NOP);
complete(&dev->can_close);
return;
}
switch (dev->state) {
case FPIX_RESET:
dev_new_state(FPIX_REQ_FRAME);
schedule_delayed_work(&dev->wqe, HZ / 10);
break;
case FPIX_REQ_FRAME:
/* get an image */
request_frame(dev);
break;
case FPIX_NOP:
case FPIX_READ_FRAME:
PDEBUG(D_STREAM, "invalid state %d", dev->state);
break;
}
out:
PDEBUG(D_STREAM, "dostream stopped");
}
/* this function is called at probe time */
static int sd_config(struct gspca_dev *gspca_dev,
const struct usb_device_id *id)
{
struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
struct cam *cam = &gspca_dev->cam;
cam->cam_mode = fpix_mode;
cam->nmodes = 1;
cam->bulk_size = FPIX_MAX_TRANSFER;
/* gspca_dev->nbalt = 1; * use bulk transfer */
return 0;
}
/* Stop streaming and free the ressources allocated by sd_start. */
static void sd_stopN(struct gspca_dev *gspca_dev)
{
struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
dev->streaming = 0;
/* Stop the state machine */
if (dev->state != FPIX_NOP)
wait_for_completion(&dev->can_close);
}
/* called on streamoff with alt 0 and disconnect */
static void sd_stop0(struct gspca_dev *gspca_dev)
{
struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
usb_free_urb(dev->control_urb);
dev->control_urb = NULL;
}
INIT_WORK(&dev->work_struct, dostream);
/* Kill an URB that hasn't completed. */
static void timeout_kill(unsigned long data)
{
struct urb *urb = (struct urb *) data;
usb_unlink_urb(urb);
return 0;
}
/* this function is called at probe and resume time */
static int sd_init(struct gspca_dev *gspca_dev)
{
struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
INIT_DELAYED_WORK(&dev->wqe, fpix_sm);
init_timer(&dev->bulk_timer);
dev->bulk_timer.function = timeout_kill;
return 0;
}
/* start the camera */
static int sd_start(struct gspca_dev *gspca_dev)
{
struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
int ret;
int size_ret;
int ret, len;
/* Init the device */
memset(gspca_dev->usb_buf, 0, 12);
gspca_dev->usb_buf[0] = 0xc6;
gspca_dev->usb_buf[8] = 0x20;
ret = usb_control_msg(gspca_dev->dev,
usb_sndctrlpipe(gspca_dev->dev, 0),
USB_REQ_GET_STATUS,
USB_DIR_OUT | USB_TYPE_CLASS |
USB_RECIP_INTERFACE, 0, 0, gspca_dev->usb_buf,
12, FPIX_TIMEOUT);
if (ret != 12) {
PDEBUG(D_STREAM, "usb_control_msg failed (%d)", ret);
ret = -EIO;
goto error;
ret = command(gspca_dev, 0);
if (ret < 0) {
PDEBUG(D_STREAM, "init failed %d", ret);
return ret;
}
/* Read the result of the command. Ignore the result, for it
* varies with the device. */
ret = usb_bulk_msg(gspca_dev->dev,
gspca_dev->urb[0]->pipe,
gspca_dev->usb_buf, FPIX_MAX_TRANSFER, &size_ret,
gspca_dev->urb[0]->transfer_buffer,
FPIX_MAX_TRANSFER, &len,
FPIX_TIMEOUT);
if (ret != 0) {
PDEBUG(D_STREAM, "usb_bulk_msg failed (%d)", ret);
ret = -EIO;
goto error;
if (ret < 0) {
PDEBUG(D_STREAM, "usb_bulk_msg failed %d", ret);
return ret;
}
/* Request a frame, but don't read it */
memset(gspca_dev->usb_buf, 0, 12);
gspca_dev->usb_buf[0] = 0xd3;
gspca_dev->usb_buf[7] = 0x01;
ret = usb_control_msg(gspca_dev->dev,
usb_sndctrlpipe(gspca_dev->dev, 0),
USB_REQ_GET_STATUS,
USB_DIR_OUT | USB_TYPE_CLASS |
USB_RECIP_INTERFACE, 0, 0, gspca_dev->usb_buf,
12, FPIX_TIMEOUT);
if (ret != 12) {
PDEBUG(D_STREAM, "usb_control_msg failed (%d)", ret);
ret = -EIO;
goto error;
ret = command(gspca_dev, 1);
if (ret < 0) {
PDEBUG(D_STREAM, "frame request failed %d", ret);
return ret;
}
/* Again, reset bulk in endpoint */
usb_clear_halt(gspca_dev->dev, gspca_dev->urb[0]->pipe);
/* Allocate a control URB */
dev->control_urb = usb_alloc_urb(0, GFP_KERNEL);
if (!dev->control_urb) {
PDEBUG(D_STREAM, "No free urbs available");
ret = -EIO;
goto error;
}
/* Various initializations. */
init_completion(&dev->can_close);
dev->bulk_timer.data = (unsigned long)dev->gspca_dev.urb[0];
dev->gspca_dev.urb[0]->complete = urb_callback;
dev->streaming = 1;
/* Schedule a frame request. */
dev_new_state(FPIX_REQ_FRAME);
schedule_delayed_work(&dev->wqe, 1);
/* Start the workqueue function to do the streaming */
dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
queue_work(dev->work_thread, &dev->work_struct);
return 0;
}
error:
/* Free the ressources */
sd_stopN(gspca_dev);
sd_stop0(gspca_dev);
return ret;
/* called on streamoff with alt==0 and on disconnect */
/* the usb_lock is held at entry - restore on exit */
static void sd_stop0(struct gspca_dev *gspca_dev)
{
struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
/* wait for the work queue to terminate */
mutex_unlock(&gspca_dev->usb_lock);
destroy_workqueue(dev->work_thread);
mutex_lock(&gspca_dev->usb_lock);
dev->work_thread = NULL;
}
/* Table of supported USB devices */
......@@ -426,7 +272,6 @@ static const struct sd_desc sd_desc = {
.config = sd_config,
.init = sd_init,
.start = sd_start,
.stopN = sd_stopN,
.stop0 = sd_stop0,
};
......@@ -455,12 +300,14 @@ static struct usb_driver sd_driver = {
static int __init sd_mod_init(void)
{
int ret;
ret = usb_register(&sd_driver);
if (ret < 0)
return ret;
PDEBUG(D_PROBE, "registered");
return 0;
}
static void __exit sd_mod_exit(void)
{
usb_deregister(&sd_driver);
......
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