diff options
Diffstat (limited to 'kernel/drivers/media/usb/cx231xx/cx231xx-vbi.c')
| -rw-r--r-- | kernel/drivers/media/usb/cx231xx/cx231xx-vbi.c | 710 |
1 files changed, 710 insertions, 0 deletions
diff --git a/kernel/drivers/media/usb/cx231xx/cx231xx-vbi.c b/kernel/drivers/media/usb/cx231xx/cx231xx-vbi.c new file mode 100644 index 000000000..80261ac40 --- /dev/null +++ b/kernel/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 "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/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 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) { + 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 &= 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 */ + dev_err(dev->dev, + "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) { + 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 = kzalloc(sizeof(void *) * num_bufs, + 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 = + kzalloc(sizeof(void *) * num_bufs, 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) { + dev_err(dev->dev, + "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]) { + dev_err(dev->dev, + "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) { + 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.i); */ + + buf->vb.state = VIDEOBUF_DONE; + buf->vb.field_count++; + v4l2_get_timestamp(&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)) { + 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, 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; +} |