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kernel-fxtec-pro1x/drivers/media/video/gspca/finepix.c
Frank Zago a3a58467db V4L/DVB (9090): gspca: Restart the state machine when no frame buffer in finepix. 
Signed-off-by: Frank Zago <frank@zago.net>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2008-10-12 09:37:13 -02:00

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/*
* Fujifilm Finepix subdriver
*
* Copyright (C) 2008 Frank Zago
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define MODULE_NAME "finepix"
#include "gspca.h"
MODULE_AUTHOR("Frank Zago <frank@zago.net>");
MODULE_DESCRIPTION("Fujifilm FinePix USB V4L2 driver");
MODULE_LICENSE("GPL");
/* Default timeout, in ms */
#define FPIX_TIMEOUT (HZ / 10)
/* Maximum transfer size to use. The windows driver reads by chunks of
* 0x2000 bytes, so do the same. Note: reading more seems to work
* too. */
#define FPIX_MAX_TRANSFER 0x2000
/* Structure to hold all of our device specific stuff */
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;
};
/* 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; \
}
/* These cameras only support 320x200. */
static struct v4l2_pix_format fpix_mode[1] = {
{ 320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
.bytesperline = 320,
.sizeimage = 320 * 240 * 3 / 8 + 590,
.colorspace = V4L2_COLORSPACE_SRGB,
.priv = 0}
};
/* Reads part of a frame */
static void read_frame_part(struct usb_fpix *dev)
{
int ret;
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);
}
}
/* Callback for URBs. */
static void urb_callback(struct urb *urb)
{
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 gspca_frame *frame;
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 the result is less than what was asked
* for, then it's the end of the
* frame. Sometime 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,
data, urb->actual_length);
dev_new_state(FPIX_REQ_FRAME);
schedule_delayed_work(&dev->wqe, NEXT_FRAME_DELAY);
} else {
/* got a partial image */
if (frame)
gspca_frame_add(gspca_dev,
gspca_dev->last_packet_type
== LAST_PACKET
? FIRST_PACKET : INTER_PACKET,
frame,
data, urb->actual_length);
read_frame_part(dev);
}
break;
}
case FPIX_NOP:
case FPIX_RESET:
PDEBUG(D_STREAM, "invalid state %d", dev->state);
break;
}
}
/* 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;
}
}
/* this function is called at probe time */
static int sd_config(struct gspca_dev *gspca_dev,
const struct usb_device_id *id)
{
struct cam *cam = &gspca_dev->cam;
cam->cam_mode = fpix_mode;
cam->nmodes = 1;
cam->epaddr = 0x01; /* todo: correct for all cams? */
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);
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 */
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;
}
static int sd_start(struct gspca_dev *gspca_dev)
{
struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
int ret;
int size_ret;
/* Reset bulk in endpoint */
usb_clear_halt(gspca_dev->dev, gspca_dev->cam.epaddr);
/* 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;
}
/* Read the result of the command. Ignore the result, for it
* varies with the device. */
ret = usb_bulk_msg(gspca_dev->dev,
usb_rcvbulkpipe(gspca_dev->dev,
gspca_dev->cam.epaddr),
gspca_dev->usb_buf, FPIX_MAX_TRANSFER, &size_ret,
FPIX_TIMEOUT);
if (ret != 0) {
PDEBUG(D_STREAM, "usb_bulk_msg failed (%d)", ret);
ret = -EIO;
goto error;
}
/* 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;
}
/* Again, reset bulk in endpoint */
usb_clear_halt(gspca_dev->dev, gspca_dev->cam.epaddr);
/* 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);
return 0;
error:
/* Free the ressources */
sd_stopN(gspca_dev);
return ret;
}
/* Table of supported USB devices */
static const __devinitdata struct usb_device_id device_table[] = {
{USB_DEVICE(0x04cb, 0x0104)},
{USB_DEVICE(0x04cb, 0x0109)},
{USB_DEVICE(0x04cb, 0x010b)},
{USB_DEVICE(0x04cb, 0x010f)},
{USB_DEVICE(0x04cb, 0x0111)},
{USB_DEVICE(0x04cb, 0x0113)},
{USB_DEVICE(0x04cb, 0x0115)},
{USB_DEVICE(0x04cb, 0x0117)},
{USB_DEVICE(0x04cb, 0x0119)},
{USB_DEVICE(0x04cb, 0x011b)},
{USB_DEVICE(0x04cb, 0x011d)},
{USB_DEVICE(0x04cb, 0x0121)},
{USB_DEVICE(0x04cb, 0x0123)},
{USB_DEVICE(0x04cb, 0x0125)},
{USB_DEVICE(0x04cb, 0x0127)},
{USB_DEVICE(0x04cb, 0x0129)},
{USB_DEVICE(0x04cb, 0x012b)},
{USB_DEVICE(0x04cb, 0x012d)},
{USB_DEVICE(0x04cb, 0x012f)},
{USB_DEVICE(0x04cb, 0x0131)},
{USB_DEVICE(0x04cb, 0x013b)},
{USB_DEVICE(0x04cb, 0x013d)},
{USB_DEVICE(0x04cb, 0x013f)},
{}
};
MODULE_DEVICE_TABLE(usb, device_table);
/* sub-driver description */
static const struct sd_desc sd_desc = {
.name = MODULE_NAME,
.config = sd_config,
.init = sd_init,
.start = sd_start,
.stopN = sd_stopN,
};
/* -- device connect -- */
static int sd_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
return gspca_dev_probe(intf, id,
&sd_desc,
sizeof(struct usb_fpix),
THIS_MODULE);
}
static struct usb_driver sd_driver = {
.name = MODULE_NAME,
.id_table = device_table,
.probe = sd_probe,
.disconnect = gspca_disconnect,
#ifdef CONFIG_PM
.suspend = gspca_suspend,
.resume = gspca_resume,
#endif
};
/* -- module insert / remove -- */
static int __init sd_mod_init(void)
{
if (usb_register(&sd_driver) < 0)
return -1;
PDEBUG(D_PROBE, "registered");
return 0;
}
static void __exit sd_mod_exit(void)
{
usb_deregister(&sd_driver);
PDEBUG(D_PROBE, "deregistered");
}
module_init(sd_mod_init);
module_exit(sd_mod_exit);
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