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[media] em28xx: add support for em25xx/em276x/em277x/em278x frame data processing 

The em25xx/em276x/em277x/em278x frame data format is different to the one used
by the em2710/em2750/em28xx chips.
With the recent cleanups and reorganization of the frame data processing code it
can be easily extended to support these devices.

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Frank Schaefer 2013-03-26 13:38:38 -03:00 committed by Mauro Carvalho Chehab
parent 736a320bd2
commit e507e0e513
1 changed files with 73 additions and 1 deletions
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74
drivers/media/usb/em28xx/em28xx-video.c
View File

@ -76,6 +76,16 @@ MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_VERSION(EM28XX_VERSION);
#define EM25XX_FRMDATAHDR_BYTE1 0x02
#define EM25XX_FRMDATAHDR_BYTE2_STILL_IMAGE 0x20
#define EM25XX_FRMDATAHDR_BYTE2_FRAME_END 0x02
#define EM25XX_FRMDATAHDR_BYTE2_FRAME_ID 0x01
#define EM25XX_FRMDATAHDR_BYTE2_MASK (EM25XX_FRMDATAHDR_BYTE2_STILL_IMAGE | \
EM25XX_FRMDATAHDR_BYTE2_FRAME_END | \
EM25XX_FRMDATAHDR_BYTE2_FRAME_ID)
static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
static unsigned int vbi_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
static unsigned int radio_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = -1U };
@ -408,6 +418,62 @@ static inline void process_frame_data_em28xx(struct em28xx *dev,
em28xx_copy_video(dev, buf, data_pkt, data_len);
}
/*
* Process data packet according to the em25xx/em276x/7x/8x frame data format
*/
static inline void process_frame_data_em25xx(struct em28xx *dev,
unsigned char *data_pkt,
unsigned int data_len)
{
struct em28xx_buffer *buf = dev->usb_ctl.vid_buf;
struct em28xx_dmaqueue *dmaq = &dev->vidq;
bool frame_end = 0;
/* Check for header */
/* NOTE: at least with bulk transfers, only the first packet
* has a header and has always set the FRAME_END bit */
if (data_len >= 2) { /* em25xx header is only 2 bytes long */
if ((data_pkt[0] == EM25XX_FRMDATAHDR_BYTE1) &&
((data_pkt[1] & ~EM25XX_FRMDATAHDR_BYTE2_MASK) == 0x00)) {
dev->top_field = !(data_pkt[1] &
EM25XX_FRMDATAHDR_BYTE2_FRAME_ID);
frame_end = data_pkt[1] &
EM25XX_FRMDATAHDR_BYTE2_FRAME_END;
data_pkt += 2;
data_len -= 2;
}
/* Finish field and prepare next (BULK only) */
if (dev->analog_xfer_bulk && frame_end) {
buf = finish_field_prepare_next(dev, buf, dmaq);
dev->usb_ctl.vid_buf = buf;
}
/* NOTE: in ISOC mode when a new frame starts and buf==NULL,
* we COULD already prepare a buffer here to avoid skipping the
* first frame.
*/
}
/* Copy data */
if (buf != NULL && data_len > 0)
em28xx_copy_video(dev, buf, data_pkt, data_len);
/* Finish frame (ISOC only) => avoids lag of 1 frame */
if (!dev->analog_xfer_bulk && frame_end) {
buf = finish_field_prepare_next(dev, buf, dmaq);
dev->usb_ctl.vid_buf = buf;
}
/* NOTE: Tested with USB bulk transfers only !
* The wording in the datasheet suggests that isoc might work different.
* The current code assumes that with isoc transfers each packet has a
* header like with the other em28xx devices.
*/
/* NOTE: Support for interlaced mode is pure theory. It has not been
* tested and it is unknown if these devices actually support it. */
/* NOTE: No VBI support yet (these chips likely do not support VBI). */
}
/* Processes and copies the URB data content (video and VBI data) */
static inline int em28xx_urb_data_copy(struct em28xx *dev, struct urb *urb)
{
@ -460,7 +526,13 @@ static inline int em28xx_urb_data_copy(struct em28xx *dev, struct urb *urb)
continue;
}
process_frame_data_em28xx(dev, usb_data_pkt, usb_data_len);
if (dev->is_em25xx)
process_frame_data_em25xx(dev,
usb_data_pkt, usb_data_len);
else
process_frame_data_em28xx(dev,
usb_data_pkt, usb_data_len);
}
return 1;
}