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V4L/DVB (11220): gspca - finepix: Use a workqueue for streaming.

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Tested-by: Frank Zago <frank@zago.net>
Acked-by: Frank Zago <frank@zago.net>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Jean-Francois Moine
2009-03-26 05:06:50 -03:00
committed by Mauro Carvalho Chehab
parent 67e4542558
commit c0c4c8937a
1 changed files with 128 additions and 281 deletions
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409
drivers/media/video/gspca/finepix.c
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@@ -27,7 +27,7 @@ MODULE_DESCRIPTION("Fujifilm FinePix USB V4L2 driver");
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
/* Default timeout, in ms */ /* 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 /* Maximum transfer size to use. The windows driver reads by chunks of
* 0x2000 bytes, so do the same. Note: reading more seems to work * 0x2000 bytes, so do the same. Note: reading more seems to work
@@ -38,38 +38,15 @@ MODULE_LICENSE("GPL");
struct usb_fpix { struct usb_fpix {
struct gspca_dev gspca_dev; /* !! must be the first item */ struct gspca_dev gspca_dev; /* !! must be the first item */
/* struct work_struct work_struct;
* USB stuff struct workqueue_struct *work_thread;
*/
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;
}; };
/* Delay after which claim the next frame. If the delay is too small, /* 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 * the camera will return old frames. On the 4800Z, 20ms is bad, 25ms
* will fail every 4 or 5 frames, but 30ms is perfect. */ * will fail every 4 or 5 frames, but 30ms is perfect. On the A210,
#define NEXT_FRAME_DELAY (((HZ * 30) + 999) / 1000) * 30ms is bad while 35ms is perfect. */
#define NEXT_FRAME_DELAY 35
#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; \
}
/* These cameras only support 320x200. */ /* These cameras only support 320x200. */
static const struct v4l2_pix_format fpix_mode[1] = { static const struct v4l2_pix_format fpix_mode[1] = {
@@ -80,314 +57,183 @@ static const struct v4l2_pix_format fpix_mode[1] = {
.priv = 0} .priv = 0}
}; };
/* Reads part of a frame */ /* send a command to the webcam */
static void read_frame_part(struct usb_fpix *dev) 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"); memcpy(gspca_dev->usb_buf, order_values[order], 12);
return usb_control_msg(gspca_dev->dev,
/* Reads part of a frame */ usb_sndctrlpipe(gspca_dev->dev, 0),
ret = usb_submit_urb(dev->gspca_dev.urb[0], GFP_ATOMIC); USB_REQ_GET_STATUS,
if (ret) { USB_DIR_OUT | USB_TYPE_CLASS |
dev_new_state(FPIX_RESET); USB_RECIP_INTERFACE, 0, 0, gspca_dev->usb_buf,
schedule_delayed_work(&dev->wqe, 1); 12, FPIX_TIMEOUT);
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);
}
} }
/* Callback for URBs. */ /* workqueue */
static void urb_callback(struct urb *urb) static void dostream(struct work_struct *work)
{ {
struct gspca_dev *gspca_dev = urb->context; struct usb_fpix *dev = container_of(work, struct usb_fpix, work_struct);
struct usb_fpix *dev = (struct usb_fpix *) gspca_dev; 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;
PDEBUG(D_PACK, /* synchronize with the main driver */
"enter urb_callback - status=%d, length=%d", mutex_lock(&gspca_dev->usb_lock);
urb->status, urb->actual_length); mutex_unlock(&gspca_dev->usb_lock);
PDEBUG(D_STREAM, "dostream started");
if (dev->state == FPIX_READ_FRAME) /* loop reading a frame */
del_timer(&dev->bulk_timer); again:
while (gspca_dev->present && gspca_dev->streaming) {
if (urb->status != 0) { /* request a frame */
/* We kill a stuck urb every 50 frames on average, so don't mutex_lock(&gspca_dev->usb_lock);
* display a log message for that. */ ret = command(gspca_dev, 1);
if (urb->status != -ECONNRESET) mutex_unlock(&gspca_dev->usb_lock);
PDEBUG(D_STREAM, "bad URB status %d", urb->status); if (ret < 0)
dev_new_state(FPIX_RESET); break;
schedule_delayed_work(&dev->wqe, 1); if (!gspca_dev->present || !gspca_dev->streaming)
} break;
switch (dev->state) { /* the frame comes in parts */
case FPIX_REQ_FRAME: for (;;) {
dev_new_state(FPIX_READ_FRAME); ret = usb_bulk_msg(gspca_dev->dev,
read_frame_part(dev); urb->pipe,
break; 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;
case FPIX_READ_FRAME: { if (len < FPIX_MAX_TRANSFER ||
unsigned char *data = urb->transfer_buffer; (data[len - 2] == 0xff &&
struct gspca_frame *frame; data[len - 1] == 0xd9)) {
frame = gspca_get_i_frame(&dev->gspca_dev); /* If the result is less than what was asked
if (frame == NULL) * for, then it's the end of the
gspca_dev->last_packet_type = DISCARD_PACKET; * frame. Sometimes the jpeg is not complete,
if (urb->actual_length < FPIX_MAX_TRANSFER || * but there's nothing we can do. We also end
(data[urb->actual_length-2] == 0xff && * here if the the jpeg ends right at the end
data[urb->actual_length-1] == 0xd9)) { * of the frame. */
if (frame)
/* If the result is less than what was asked frame = gspca_frame_add(gspca_dev,
* for, then it's the end of the LAST_PACKET,
* frame. Sometime the jpeg is not complete, frame,
* but there's nothing we can do. We also end data, len);
* here if the the jpeg ends right at the end break;
* of the frame. */ }
if (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 {
/* got a partial image */ /* got a partial image */
if (frame) if (frame)
gspca_frame_add(gspca_dev, gspca_frame_add(gspca_dev,
gspca_dev->last_packet_type gspca_dev->last_packet_type
== LAST_PACKET == LAST_PACKET
? FIRST_PACKET : INTER_PACKET, ? FIRST_PACKET : INTER_PACKET,
frame, frame, data, len);
data, urb->actual_length);
read_frame_part(dev);
} }
break;
}
case FPIX_NOP: /* We must wait before trying reading the next
case FPIX_RESET: * frame. If we don't, or if the delay is too short,
PDEBUG(D_STREAM, "invalid state %d", dev->state); * the camera will disconnect. */
break; 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) { out:
PDEBUG(D_STREAM, "stopping state machine"); PDEBUG(D_STREAM, "dostream stopped");
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;
}
} }
/* this function is called at probe time */ /* this function is called at probe time */
static int sd_config(struct gspca_dev *gspca_dev, static int sd_config(struct gspca_dev *gspca_dev,
const struct usb_device_id *id) const struct usb_device_id *id)
{ {
struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
struct cam *cam = &gspca_dev->cam; struct cam *cam = &gspca_dev->cam;
cam->cam_mode = fpix_mode; cam->cam_mode = fpix_mode;
cam->nmodes = 1; cam->nmodes = 1;
cam->bulk_size = FPIX_MAX_TRANSFER; cam->bulk_size = FPIX_MAX_TRANSFER;
/* gspca_dev->nbalt = 1; * use bulk transfer */ INIT_WORK(&dev->work_struct, dostream);
return 0; 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;
}
/* Kill an URB that hasn't completed. */
static void timeout_kill(unsigned long data)
{
struct urb *urb = (struct urb *) data;
usb_unlink_urb(urb);
}
/* this function is called at probe and resume time */ /* this function is called at probe and resume time */
static int sd_init(struct gspca_dev *gspca_dev) 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; return 0;
} }
/* start the camera */
static int sd_start(struct gspca_dev *gspca_dev) static int sd_start(struct gspca_dev *gspca_dev)
{ {
struct usb_fpix *dev = (struct usb_fpix *) gspca_dev; struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
int ret; int ret, len;
int size_ret;
/* Init the device */ /* Init the device */
memset(gspca_dev->usb_buf, 0, 12); ret = command(gspca_dev, 0);
gspca_dev->usb_buf[0] = 0xc6; if (ret < 0) {
gspca_dev->usb_buf[8] = 0x20; PDEBUG(D_STREAM, "init failed %d", ret);
return ret;
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;
} }
/* Read the result of the command. Ignore the result, for it /* Read the result of the command. Ignore the result, for it
* varies with the device. */ * varies with the device. */
ret = usb_bulk_msg(gspca_dev->dev, ret = usb_bulk_msg(gspca_dev->dev,
gspca_dev->urb[0]->pipe, 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); FPIX_TIMEOUT);
if (ret != 0) { if (ret < 0) {
PDEBUG(D_STREAM, "usb_bulk_msg failed (%d)", ret); PDEBUG(D_STREAM, "usb_bulk_msg failed %d", ret);
ret = -EIO; return ret;
goto error;
} }
/* Request a frame, but don't read it */ /* Request a frame, but don't read it */
memset(gspca_dev->usb_buf, 0, 12); ret = command(gspca_dev, 1);
gspca_dev->usb_buf[0] = 0xd3; if (ret < 0) {
gspca_dev->usb_buf[7] = 0x01; PDEBUG(D_STREAM, "frame request failed %d", ret);
return ret;
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;
} }
/* Again, reset bulk in endpoint */ /* Again, reset bulk in endpoint */
usb_clear_halt(gspca_dev->dev, gspca_dev->urb[0]->pipe); usb_clear_halt(gspca_dev->dev, gspca_dev->urb[0]->pipe);
/* Allocate a control URB */ /* Start the workqueue function to do the streaming */
dev->control_urb = usb_alloc_urb(0, GFP_KERNEL); dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
if (!dev->control_urb) { queue_work(dev->work_thread, &dev->work_struct);
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);
return 0; return 0;
}
error: /* called on streamoff with alt==0 and on disconnect */
/* Free the ressources */ /* the usb_lock is held at entry - restore on exit */
sd_stopN(gspca_dev); static void sd_stop0(struct gspca_dev *gspca_dev)
sd_stop0(gspca_dev); {
return ret; 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 */ /* Table of supported USB devices */
@@ -422,12 +268,11 @@ MODULE_DEVICE_TABLE(usb, device_table);
/* sub-driver description */ /* sub-driver description */
static const struct sd_desc sd_desc = { static const struct sd_desc sd_desc = {
.name = MODULE_NAME, .name = MODULE_NAME,
.config = sd_config, .config = sd_config,
.init = sd_init, .init = sd_init,
.start = sd_start, .start = sd_start,
.stopN = sd_stopN, .stop0 = sd_stop0,
.stop0 = sd_stop0,
}; };
/* -- device connect -- */ /* -- device connect -- */
@@ -441,13 +286,13 @@ static int sd_probe(struct usb_interface *intf,
} }
static struct usb_driver sd_driver = { static struct usb_driver sd_driver = {
.name = MODULE_NAME, .name = MODULE_NAME,
.id_table = device_table, .id_table = device_table,
.probe = sd_probe, .probe = sd_probe,
.disconnect = gspca_disconnect, .disconnect = gspca_disconnect,
#ifdef CONFIG_PM #ifdef CONFIG_PM
.suspend = gspca_suspend, .suspend = gspca_suspend,
.resume = gspca_resume, .resume = gspca_resume,
#endif #endif
}; };
@@ -455,12 +300,14 @@ static struct usb_driver sd_driver = {
static int __init sd_mod_init(void) static int __init sd_mod_init(void)
{ {
int ret; int ret;
ret = usb_register(&sd_driver); ret = usb_register(&sd_driver);
if (ret < 0) if (ret < 0)
return ret; return ret;
PDEBUG(D_PROBE, "registered"); PDEBUG(D_PROBE, "registered");
return 0; return 0;
} }
static void __exit sd_mod_exit(void) static void __exit sd_mod_exit(void)
{ {
usb_deregister(&sd_driver); usb_deregister(&sd_driver);