// SPDX-License-Identifier: GPL-2.0-or-later
/*
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
*/
#include "cx231xx.h"
#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/bitmap.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/drv-intf/msp3400.h>
#include <media/tuner.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 synchronously" ;
break ;
case -ECONNRESET:
errmsg = "unlinked asynchronously" ;
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 ) {
dev_err(dev->dev,
"URB status %d [%s].\n" , status, errmsg);
} else {
dev_err(dev->dev,
"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 &= 0 xF0;
/* 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 &= 0 xF0;
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_queue_setup(struct vb2_queue *vq,
unsigned int *nbuffers, unsigned int *nplanes,
unsigned int sizes[], struct device *alloc_devs[])
{
struct cx231xx *dev = vb2_get_drv_priv(vq);
u32 height = 0 ;
height = ((dev->norm & V4L2_STD_625_50) ?
PAL_VBI_LINES : NTSC_VBI_LINES);
*nplanes = 1 ;
sizes[0 ] = (dev->width * height * 2 * 2 );
return 0 ;
}
/* This is called *without* dev->slock held; please keep it that way */
static int vbi_buf_prepare(struct vb2_buffer *vb)
{
struct cx231xx *dev = vb2_get_drv_priv(vb->vb2_queue);
u32 height = 0 ;
u32 size;
height = ((dev->norm & V4L2_STD_625_50) ?
PAL_VBI_LINES : NTSC_VBI_LINES);
size = ((dev->width << 1 ) * height * 2 );
if (vb2_plane_size(vb, 0 ) < size)
return -EINVAL;
vb2_set_plane_payload(vb, 0 , size);
return 0 ;
}
static void vbi_buf_queue(struct vb2_buffer *vb)
{
struct cx231xx *dev = vb2_get_drv_priv(vb->vb2_queue);
struct cx231xx_buffer *buf =
container_of(vb, struct cx231xx_buffer, vb.vb2_buf);
struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
unsigned long flags;
spin_lock_irqsave(&dev->vbi_mode.slock, flags);
list_add_tail(&buf->list, &vidq->active);
spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
}
static void return_all_buffers(struct cx231xx *dev,
enum vb2_buffer_state state)
{
struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
struct cx231xx_buffer *buf, *node;
unsigned long flags;
spin_lock_irqsave(&dev->vbi_mode.slock, flags);
dev->vbi_mode.bulk_ctl.buf = NULL;
list_for_each_entry_safe(buf, node, &vidq->active, list) {
list_del(&buf->list);
vb2_buffer_done(&buf->vb.vb2_buf, state);
}
spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
}
static int vbi_start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct cx231xx *dev = vb2_get_drv_priv(vq);
struct cx231xx_dmaqueue *vidq = &dev->vbi_mode.vidq;
int ret;
vidq->sequence = 0 ;
ret = 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 (ret)
return_all_buffers(dev, VB2_BUF_STATE_QUEUED);
return ret;
}
static void vbi_stop_streaming(struct vb2_queue *vq)
{
struct cx231xx *dev = vb2_get_drv_priv(vq);
return_all_buffers(dev, VB2_BUF_STATE_ERROR);
}
struct vb2_ops cx231xx_vbi_qops = {
.queue_setup = vbi_queue_setup,
.buf_prepare = vbi_buf_prepare,
.buf_queue = vbi_buf_queue,
.start_streaming = vbi_start_streaming,
.stop_streaming = vbi_stop_streaming,
};
/* ------------------------------------------------------------------
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);
unsigned long flags;
switch (urb->status) {
case 0 : /* success */
case -ETIMEDOUT: /* NAK */
break ;
case -ECONNRESET: /* kill */
case -ENOENT:
case -ESHUTDOWN:
return ;
default : /* error */
dev_err(dev->dev,
"urb completion error %d.\n" , urb->status);
break ;
}
/* Copy data from URB */
spin_lock_irqsave(&dev->vbi_mode.slock, flags);
dev->vbi_mode.bulk_ctl.bulk_copy(dev, urb);
spin_unlock_irqrestore(&dev->vbi_mode.slock, flags);
/* Reset status */
urb->status = 0 ;
urb->status = usb_submit_urb(urb, GFP_ATOMIC);
if (urb->status) {
dev_err(dev->dev, "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;
dev_dbg(dev->dev, "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;
dev_dbg(dev->dev, "called cx231xx_vbi_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 = kcalloc(num_bufs, sizeof (void *),
GFP_KERNEL);
if (!dev->vbi_mode.bulk_ctl.urb) {
dev_err(dev->dev,
"cannot alloc memory for usb buffers\n" );
return -ENOMEM;
}
dev->vbi_mode.bulk_ctl.transfer_buffer =
kcalloc(num_bufs, sizeof (void *), GFP_KERNEL);
if (!dev->vbi_mode.bulk_ctl.transfer_buffer) {
dev_err(dev->dev,
"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_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]) {
dev_err(dev->dev,
"unable to allocate %i bytes for transfer buffer %i\n" ,
sb_size, i);
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) {
dev_err(dev->dev,
"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 */
/* dev_dbg(dev->dev, "[%p/%d] wakeup\n", buf, buf->vb.index); */
buf->vb.sequence = dma_q->sequence++;
buf->vb.vb2_buf.timestamp = ktime_get_ns();
dev->vbi_mode.bulk_ctl.buf = NULL;
list_del(&buf->list);
vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_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;
}
/*
* 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)) {
dev_err(dev->dev, "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, list);
/* Cleans up buffer - Useful for testing for frame/URB loss */
outp = vb2_plane_vaddr(&(*buf)->vb.vb2_buf, 0 );
memset(outp, 0 , vb2_plane_size(&(*buf)->vb.vb2_buf, 0 ));
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 = vb2_plane_vaddr(&buf->vb.vb2_buf, 0 );
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 ;
}
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