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Diffstat (limited to 'drivers/media/usb/cx231xx/cx231xx-vbi.c')
-rw-r--r--drivers/media/usb/cx231xx/cx231xx-vbi.c710
1 files changed, 710 insertions, 0 deletions
diff --git a/drivers/media/usb/cx231xx/cx231xx-vbi.c b/drivers/media/usb/cx231xx/cx231xx-vbi.c
new file mode 100644
index 00000000000..ac7db52f404
--- /dev/null
+++ b/drivers/media/usb/cx231xx/cx231xx-vbi.c
@@ -0,0 +1,710 @@
+/*
+ cx231xx_vbi.c - driver for Conexant Cx23100/101/102 USB video capture devices
+
+ Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
+ Based on cx88 driver
+
+ 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
+ (at your option) 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/bitmap.h>
+#include <linux/usb.h>
+#include <linux/i2c.h>
+#include <linux/mm.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+
+#include <media/v4l2-common.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-chip-ident.h>
+#include <media/msp3400.h>
+#include <media/tuner.h>
+
+#include "cx231xx.h"
+#include "cx231xx-vbi.h"
+
+static inline void print_err_status(struct cx231xx *dev, int packet, int status)
+{
+ char *errmsg = "Unknown";
+
+ switch (status) {
+ case -ENOENT:
+ errmsg = "unlinked synchronuously";
+ break;
+ case -ECONNRESET:
+ errmsg = "unlinked asynchronuously";
+ break;
+ case -ENOSR:
+ errmsg = "Buffer error (overrun)";
+ break;
+ case -EPIPE:
+ errmsg = "Stalled (device not responding)";
+ break;
+ case -EOVERFLOW:
+ errmsg = "Babble (bad cable?)";
+ break;
+ case -EPROTO:
+ errmsg = "Bit-stuff error (bad cable?)";
+ break;
+ case -EILSEQ:
+ errmsg = "CRC/Timeout (could be anything)";
+ break;
+ case -ETIME:
+ errmsg = "Device does not respond";
+ break;
+ }
+ if (packet < 0) {
+ cx231xx_err(DRIVER_NAME "URB status %d [%s].\n", status,
+ errmsg);
+ } else {
+ cx231xx_err(DRIVER_NAME "URB packet %d, status %d [%s].\n",
+ packet, status, errmsg);
+ }
+}
+
+/*
+ * Controls the isoc copy of each urb packet
+ */
+static inline int cx231xx_isoc_vbi_copy(struct cx231xx *dev, struct urb *urb)
+{
+ struct cx231xx_dmaqueue *dma_q = urb->context;
+ int rc = 1;
+ unsigned char *p_buffer;
+ u32 bytes_parsed = 0, buffer_size = 0;
+ u8 sav_eav = 0;
+
+ if (!dev)
+ return 0;
+
+ if (dev->state & DEV_DISCONNECTED)
+ return 0;
+
+ if (urb->status < 0) {
+ print_err_status(dev, -1, urb->status);
+ if (urb->status == -ENOENT)
+ return 0;
+ }
+
+ /* get buffer pointer and length */
+ p_buffer = urb->transfer_buffer;
+ buffer_size = urb->actual_length;
+
+ if (buffer_size > 0) {
+ bytes_parsed = 0;
+
+ if (dma_q->is_partial_line) {
+ /* Handle the case where we were working on a partial
+ line */
+ sav_eav = dma_q->last_sav;
+ } else {
+ /* Check for a SAV/EAV overlapping the
+ buffer boundary */
+
+ sav_eav = cx231xx_find_boundary_SAV_EAV(p_buffer,
+ dma_q->partial_buf,
+ &bytes_parsed);
+ }
+
+ sav_eav &= 0xF0;
+ /* Get the first line if we have some portion of an SAV/EAV from
+ the last buffer or a partial line */
+ if (sav_eav) {
+ bytes_parsed += cx231xx_get_vbi_line(dev, dma_q,
+ sav_eav, /* SAV/EAV */
+ p_buffer + bytes_parsed, /* p_buffer */
+ buffer_size - bytes_parsed); /* buffer size */
+ }
+
+ /* Now parse data that is completely in this buffer */
+ dma_q->is_partial_line = 0;
+
+ while (bytes_parsed < buffer_size) {
+ u32 bytes_used = 0;
+
+ sav_eav = cx231xx_find_next_SAV_EAV(
+ p_buffer + bytes_parsed, /* p_buffer */
+ buffer_size - bytes_parsed, /* buffer size */
+ &bytes_used); /* bytes used to get SAV/EAV */
+
+ bytes_parsed += bytes_used;
+
+ sav_eav &= 0xF0;
+ if (sav_eav && (bytes_parsed < buffer_size)) {
+ bytes_parsed += cx231xx_get_vbi_line(dev,
+ dma_q, sav_eav, /* SAV/EAV */
+ p_buffer+bytes_parsed, /* p_buffer */
+ buffer_size-bytes_parsed);/*buf size*/
+ }
+ }
+
+ /* Save the last four bytes of the buffer so we can
+ check the buffer boundary condition next time */
+ memcpy(dma_q->partial_buf, p_buffer + buffer_size - 4, 4);
+ bytes_parsed = 0;
+ }
+
+ return rc;
+}
+
+/* ------------------------------------------------------------------
+ Vbi buf operations
+ ------------------------------------------------------------------*/
+
+static int
+vbi_buffer_setup(struct videobuf_queue *vq, unsigned int *count,
+ unsigned int *size)
+{
+ struct cx231xx_fh *fh = vq->priv_data;
+ struct cx231xx *dev = fh->dev;
+ u32 height = 0;
+
+ height = ((dev->norm & V4L2_STD_625_50) ?
+ PAL_VBI_LINES : NTSC_VBI_LINES);
+
+ *size = (dev->width * height * 2 * 2);
+ if (0 == *count)
+ *count = CX231XX_DEF_VBI_BUF;
+
+ if (*count < CX231XX_MIN_BUF)
+ *count = CX231XX_MIN_BUF;
+
+ return 0;
+}
+
+/* This is called *without* dev->slock held; please keep it that way */
+static void free_buffer(struct videobuf_queue *vq, struct cx231xx_buffer *buf)
+{
+ struct cx231xx_fh *fh = vq->priv_data;
+ struct cx231xx *dev = fh->dev;
+ unsigned long flags = 0;
+ if (in_interrupt())
+ BUG();
+
+ /* We used to wait for the buffer to finish here, but this didn't work
+ because, as we were keeping the state as VIDEOBUF_QUEUED,
+ videobuf_queue_cancel marked it as finished for us.
+ (Also, it could wedge forever if the hardware was misconfigured.)
+
+ This should be safe; by the time we get here, the buffer isn't
+ queued anymore. If we ever start marking the buffers as
+ VIDEOBUF_ACTIVE, it won't be, though.
+ */
+ spin_lock_irqsave(&dev->vbi_mode.slock, flags);
+ if (dev->vbi_mode.bulk_ctl.buf == buf)
+ dev->vbi_mode.bulk_ctl.buf = NULL;
+ spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
+
+ videobuf_vmalloc_free(&buf->vb);
+ buf->vb.state = VIDEOBUF_NEEDS_INIT;
+}
+
+static int
+vbi_buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
+ enum v4l2_field field)
+{
+ struct cx231xx_fh *fh = vq->priv_data;
+ struct cx231xx_buffer *buf =
+ container_of(vb, struct cx231xx_buffer, vb);
+ struct cx231xx *dev = fh->dev;
+ int rc = 0, urb_init = 0;
+ u32 height = 0;
+
+ height = ((dev->norm & V4L2_STD_625_50) ?
+ PAL_VBI_LINES : NTSC_VBI_LINES);
+ buf->vb.size = ((dev->width << 1) * height * 2);
+
+ if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
+ return -EINVAL;
+
+ buf->vb.width = dev->width;
+ buf->vb.height = height;
+ buf->vb.field = field;
+ buf->vb.field = V4L2_FIELD_SEQ_TB;
+
+ if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
+ rc = videobuf_iolock(vq, &buf->vb, NULL);
+ if (rc < 0)
+ goto fail;
+ }
+
+ if (!dev->vbi_mode.bulk_ctl.num_bufs)
+ urb_init = 1;
+
+ if (urb_init) {
+ rc = cx231xx_init_vbi_isoc(dev, CX231XX_NUM_VBI_PACKETS,
+ CX231XX_NUM_VBI_BUFS,
+ dev->vbi_mode.alt_max_pkt_size[0],
+ cx231xx_isoc_vbi_copy);
+ if (rc < 0)
+ goto fail;
+ }
+
+ buf->vb.state = VIDEOBUF_PREPARED;
+ return 0;
+
+fail:
+ free_buffer(vq, buf);
+ return rc;
+}
+
+static void
+vbi_buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
+{
+ struct cx231xx_buffer *buf =
+ container_of(vb, struct cx231xx_buffer, vb);
+ struct cx231xx_fh *fh = vq->priv_data;
+ struct cx231xx *dev = fh->dev;
+ struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
+
+ buf->vb.state = VIDEOBUF_QUEUED;
+ list_add_tail(&buf->vb.queue, &vidq->active);
+
+}
+
+static void vbi_buffer_release(struct videobuf_queue *vq,
+ struct videobuf_buffer *vb)
+{
+ struct cx231xx_buffer *buf =
+ container_of(vb, struct cx231xx_buffer, vb);
+
+
+ free_buffer(vq, buf);
+}
+
+struct videobuf_queue_ops cx231xx_vbi_qops = {
+ .buf_setup = vbi_buffer_setup,
+ .buf_prepare = vbi_buffer_prepare,
+ .buf_queue = vbi_buffer_queue,
+ .buf_release = vbi_buffer_release,
+};
+
+/* ------------------------------------------------------------------
+ URB control
+ ------------------------------------------------------------------*/
+
+/*
+ * IRQ callback, called by URB callback
+ */
+static void cx231xx_irq_vbi_callback(struct urb *urb)
+{
+ struct cx231xx_dmaqueue *dma_q = urb->context;
+ struct cx231xx_video_mode *vmode =
+ container_of(dma_q, struct cx231xx_video_mode, vidq);
+ struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
+
+ switch (urb->status) {
+ case 0: /* success */
+ case -ETIMEDOUT: /* NAK */
+ break;
+ case -ECONNRESET: /* kill */
+ case -ENOENT:
+ case -ESHUTDOWN:
+ return;
+ default: /* error */
+ cx231xx_err(DRIVER_NAME "urb completition error %d.\n",
+ urb->status);
+ break;
+ }
+
+ /* Copy data from URB */
+ spin_lock(&dev->vbi_mode.slock);
+ dev->vbi_mode.bulk_ctl.bulk_copy(dev, urb);
+ spin_unlock(&dev->vbi_mode.slock);
+
+ /* Reset status */
+ urb->status = 0;
+
+ urb->status = usb_submit_urb(urb, GFP_ATOMIC);
+ if (urb->status) {
+ cx231xx_err(DRIVER_NAME "urb resubmit failed (error=%i)\n",
+ urb->status);
+ }
+}
+
+/*
+ * Stop and Deallocate URBs
+ */
+void cx231xx_uninit_vbi_isoc(struct cx231xx *dev)
+{
+ struct urb *urb;
+ int i;
+
+ cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_uninit_vbi_isoc\n");
+
+ dev->vbi_mode.bulk_ctl.nfields = -1;
+ for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
+ urb = dev->vbi_mode.bulk_ctl.urb[i];
+ if (urb) {
+ if (!irqs_disabled())
+ usb_kill_urb(urb);
+ else
+ usb_unlink_urb(urb);
+
+ if (dev->vbi_mode.bulk_ctl.transfer_buffer[i]) {
+
+ kfree(dev->vbi_mode.bulk_ctl.
+ transfer_buffer[i]);
+ dev->vbi_mode.bulk_ctl.transfer_buffer[i] =
+ NULL;
+ }
+ usb_free_urb(urb);
+ dev->vbi_mode.bulk_ctl.urb[i] = NULL;
+ }
+ dev->vbi_mode.bulk_ctl.transfer_buffer[i] = NULL;
+ }
+
+ kfree(dev->vbi_mode.bulk_ctl.urb);
+ kfree(dev->vbi_mode.bulk_ctl.transfer_buffer);
+
+ dev->vbi_mode.bulk_ctl.urb = NULL;
+ dev->vbi_mode.bulk_ctl.transfer_buffer = NULL;
+ dev->vbi_mode.bulk_ctl.num_bufs = 0;
+
+ cx231xx_capture_start(dev, 0, Vbi);
+}
+EXPORT_SYMBOL_GPL(cx231xx_uninit_vbi_isoc);
+
+/*
+ * Allocate URBs and start IRQ
+ */
+int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets,
+ int num_bufs, int max_pkt_size,
+ int (*bulk_copy) (struct cx231xx *dev,
+ struct urb *urb))
+{
+ struct cx231xx_dmaqueue *dma_q = &dev->vbi_mode.vidq;
+ int i;
+ int sb_size, pipe;
+ struct urb *urb;
+ int rc;
+
+ cx231xx_info(DRIVER_NAME "cx231xx: called cx231xx_prepare_isoc\n");
+
+ /* De-allocates all pending stuff */
+ cx231xx_uninit_vbi_isoc(dev);
+
+ /* clear if any halt */
+ usb_clear_halt(dev->udev,
+ usb_rcvbulkpipe(dev->udev,
+ dev->vbi_mode.end_point_addr));
+
+ dev->vbi_mode.bulk_ctl.bulk_copy = bulk_copy;
+ dev->vbi_mode.bulk_ctl.num_bufs = num_bufs;
+ dma_q->pos = 0;
+ dma_q->is_partial_line = 0;
+ dma_q->last_sav = 0;
+ dma_q->current_field = -1;
+ dma_q->bytes_left_in_line = dev->width << 1;
+ dma_q->lines_per_field = ((dev->norm & V4L2_STD_625_50) ?
+ PAL_VBI_LINES : NTSC_VBI_LINES);
+ dma_q->lines_completed = 0;
+ for (i = 0; i < 8; i++)
+ dma_q->partial_buf[i] = 0;
+
+ dev->vbi_mode.bulk_ctl.urb = kzalloc(sizeof(void *) * num_bufs,
+ GFP_KERNEL);
+ if (!dev->vbi_mode.bulk_ctl.urb) {
+ cx231xx_errdev("cannot alloc memory for usb buffers\n");
+ return -ENOMEM;
+ }
+
+ dev->vbi_mode.bulk_ctl.transfer_buffer =
+ kzalloc(sizeof(void *) * num_bufs, GFP_KERNEL);
+ if (!dev->vbi_mode.bulk_ctl.transfer_buffer) {
+ cx231xx_errdev("cannot allocate memory for usbtransfer\n");
+ kfree(dev->vbi_mode.bulk_ctl.urb);
+ return -ENOMEM;
+ }
+
+ dev->vbi_mode.bulk_ctl.max_pkt_size = max_pkt_size;
+ dev->vbi_mode.bulk_ctl.buf = NULL;
+
+ sb_size = max_packets * dev->vbi_mode.bulk_ctl.max_pkt_size;
+
+ /* allocate urbs and transfer buffers */
+ for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
+
+ urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!urb) {
+ cx231xx_err(DRIVER_NAME
+ ": cannot alloc bulk_ctl.urb %i\n", i);
+ cx231xx_uninit_vbi_isoc(dev);
+ return -ENOMEM;
+ }
+ dev->vbi_mode.bulk_ctl.urb[i] = urb;
+ urb->transfer_flags = 0;
+
+ dev->vbi_mode.bulk_ctl.transfer_buffer[i] =
+ kzalloc(sb_size, GFP_KERNEL);
+ if (!dev->vbi_mode.bulk_ctl.transfer_buffer[i]) {
+ cx231xx_err(DRIVER_NAME
+ ": unable to allocate %i bytes for transfer"
+ " buffer %i%s\n", sb_size, i,
+ in_interrupt() ? " while in int" : "");
+ cx231xx_uninit_vbi_isoc(dev);
+ return -ENOMEM;
+ }
+
+ pipe = usb_rcvbulkpipe(dev->udev, dev->vbi_mode.end_point_addr);
+ usb_fill_bulk_urb(urb, dev->udev, pipe,
+ dev->vbi_mode.bulk_ctl.transfer_buffer[i],
+ sb_size, cx231xx_irq_vbi_callback, dma_q);
+ }
+
+ init_waitqueue_head(&dma_q->wq);
+
+ /* submit urbs and enables IRQ */
+ for (i = 0; i < dev->vbi_mode.bulk_ctl.num_bufs; i++) {
+ rc = usb_submit_urb(dev->vbi_mode.bulk_ctl.urb[i], GFP_ATOMIC);
+ if (rc) {
+ cx231xx_err(DRIVER_NAME
+ ": submit of urb %i failed (error=%i)\n", i,
+ rc);
+ cx231xx_uninit_vbi_isoc(dev);
+ return rc;
+ }
+ }
+
+ cx231xx_capture_start(dev, 1, Vbi);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cx231xx_init_vbi_isoc);
+
+u32 cx231xx_get_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
+ u8 sav_eav, u8 *p_buffer, u32 buffer_size)
+{
+ u32 bytes_copied = 0;
+ int current_field = -1;
+
+ switch (sav_eav) {
+
+ case SAV_VBI_FIELD1:
+ current_field = 1;
+ break;
+
+ case SAV_VBI_FIELD2:
+ current_field = 2;
+ break;
+ default:
+ break;
+ }
+
+ if (current_field < 0)
+ return bytes_copied;
+
+ dma_q->last_sav = sav_eav;
+
+ bytes_copied =
+ cx231xx_copy_vbi_line(dev, dma_q, p_buffer, buffer_size,
+ current_field);
+
+ return bytes_copied;
+}
+
+/*
+ * Announces that a buffer were filled and request the next
+ */
+static inline void vbi_buffer_filled(struct cx231xx *dev,
+ struct cx231xx_dmaqueue *dma_q,
+ struct cx231xx_buffer *buf)
+{
+ /* Advice that buffer was filled */
+ /* cx231xx_info(DRIVER_NAME "[%p/%d] wakeup\n", buf, buf->vb.i); */
+
+ buf->vb.state = VIDEOBUF_DONE;
+ buf->vb.field_count++;
+ do_gettimeofday(&buf->vb.ts);
+
+ dev->vbi_mode.bulk_ctl.buf = NULL;
+
+ list_del(&buf->vb.queue);
+ wake_up(&buf->vb.done);
+}
+
+u32 cx231xx_copy_vbi_line(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
+ u8 *p_line, u32 length, int field_number)
+{
+ u32 bytes_to_copy;
+ struct cx231xx_buffer *buf;
+ u32 _line_size = dev->width * 2;
+
+ if (dma_q->current_field == -1) {
+ /* Just starting up */
+ cx231xx_reset_vbi_buffer(dev, dma_q);
+ }
+
+ if (dma_q->current_field != field_number)
+ dma_q->lines_completed = 0;
+
+ /* get the buffer pointer */
+ buf = dev->vbi_mode.bulk_ctl.buf;
+
+ /* Remember the field number for next time */
+ dma_q->current_field = field_number;
+
+ bytes_to_copy = dma_q->bytes_left_in_line;
+ if (bytes_to_copy > length)
+ bytes_to_copy = length;
+
+ if (dma_q->lines_completed >= dma_q->lines_per_field) {
+ dma_q->bytes_left_in_line -= bytes_to_copy;
+ dma_q->is_partial_line =
+ (dma_q->bytes_left_in_line == 0) ? 0 : 1;
+ return 0;
+ }
+
+ dma_q->is_partial_line = 1;
+
+ /* If we don't have a buffer, just return the number of bytes we would
+ have copied if we had a buffer. */
+ if (!buf) {
+ dma_q->bytes_left_in_line -= bytes_to_copy;
+ dma_q->is_partial_line =
+ (dma_q->bytes_left_in_line == 0) ? 0 : 1;
+ return bytes_to_copy;
+ }
+
+ /* copy the data to video buffer */
+ cx231xx_do_vbi_copy(dev, dma_q, p_line, bytes_to_copy);
+
+ dma_q->pos += bytes_to_copy;
+ dma_q->bytes_left_in_line -= bytes_to_copy;
+
+ if (dma_q->bytes_left_in_line == 0) {
+
+ dma_q->bytes_left_in_line = _line_size;
+ dma_q->lines_completed++;
+ dma_q->is_partial_line = 0;
+
+ if (cx231xx_is_vbi_buffer_done(dev, dma_q) && buf) {
+
+ vbi_buffer_filled(dev, dma_q, buf);
+
+ dma_q->pos = 0;
+ dma_q->lines_completed = 0;
+ cx231xx_reset_vbi_buffer(dev, dma_q);
+ }
+ }
+
+ return bytes_to_copy;
+}
+
+/*
+ * video-buf generic routine to get the next available buffer
+ */
+static inline void get_next_vbi_buf(struct cx231xx_dmaqueue *dma_q,
+ struct cx231xx_buffer **buf)
+{
+ struct cx231xx_video_mode *vmode =
+ container_of(dma_q, struct cx231xx_video_mode, vidq);
+ struct cx231xx *dev = container_of(vmode, struct cx231xx, vbi_mode);
+ char *outp;
+
+ if (list_empty(&dma_q->active)) {
+ cx231xx_err(DRIVER_NAME ": No active queue to serve\n");
+ dev->vbi_mode.bulk_ctl.buf = NULL;
+ *buf = NULL;
+ return;
+ }
+
+ /* Get the next buffer */
+ *buf = list_entry(dma_q->active.next, struct cx231xx_buffer, vb.queue);
+
+ /* Cleans up buffer - Useful for testing for frame/URB loss */
+ outp = videobuf_to_vmalloc(&(*buf)->vb);
+ memset(outp, 0, (*buf)->vb.size);
+
+ dev->vbi_mode.bulk_ctl.buf = *buf;
+
+ return;
+}
+
+void cx231xx_reset_vbi_buffer(struct cx231xx *dev,
+ struct cx231xx_dmaqueue *dma_q)
+{
+ struct cx231xx_buffer *buf;
+
+ buf = dev->vbi_mode.bulk_ctl.buf;
+
+ if (buf == NULL) {
+ /* first try to get the buffer */
+ get_next_vbi_buf(dma_q, &buf);
+
+ dma_q->pos = 0;
+ dma_q->current_field = -1;
+ }
+
+ dma_q->bytes_left_in_line = dev->width << 1;
+ dma_q->lines_completed = 0;
+}
+
+int cx231xx_do_vbi_copy(struct cx231xx *dev, struct cx231xx_dmaqueue *dma_q,
+ u8 *p_buffer, u32 bytes_to_copy)
+{
+ u8 *p_out_buffer = NULL;
+ u32 current_line_bytes_copied = 0;
+ struct cx231xx_buffer *buf;
+ u32 _line_size = dev->width << 1;
+ void *startwrite;
+ int offset, lencopy;
+
+ buf = dev->vbi_mode.bulk_ctl.buf;
+
+ if (buf == NULL)
+ return -EINVAL;
+
+ p_out_buffer = videobuf_to_vmalloc(&buf->vb);
+
+ if (dma_q->bytes_left_in_line != _line_size) {
+ current_line_bytes_copied =
+ _line_size - dma_q->bytes_left_in_line;
+ }
+
+ offset = (dma_q->lines_completed * _line_size) +
+ current_line_bytes_copied;
+
+ if (dma_q->current_field == 2) {
+ /* Populate the second half of the frame */
+ offset += (dev->width * 2 * dma_q->lines_per_field);
+ }
+
+ /* prepare destination address */
+ startwrite = p_out_buffer + offset;
+
+ lencopy = dma_q->bytes_left_in_line > bytes_to_copy ?
+ bytes_to_copy : dma_q->bytes_left_in_line;
+
+ memcpy(startwrite, p_buffer, lencopy);
+
+ return 0;
+}
+
+u8 cx231xx_is_vbi_buffer_done(struct cx231xx *dev,
+ struct cx231xx_dmaqueue *dma_q)
+{
+ u32 height = 0;
+
+ height = ((dev->norm & V4L2_STD_625_50) ?
+ PAL_VBI_LINES : NTSC_VBI_LINES);
+ if (dma_q->lines_completed == height && dma_q->current_field == 2)
+ return 1;
+ else
+ return 0;
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-18 12:54:41 +0000