drivers/media/video/saa7134/saa7134-vbi.c - kernel/msm - Gitiles

 /*
  *
  * device driver for philips saa7134 based TV cards
  * video4linux video interface
  *
  * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
  *
  *  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/slab.h>

 #include "saa7134-reg.h"
 #include "saa7134.h"

 /* ------------------------------------------------------------------ */

 static unsigned int vbi_debug  = 0;
 module_param(vbi_debug, int, 0644);
 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");

 static unsigned int vbibufs = 4;
 module_param(vbibufs, int, 0444);
 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");

 #define dprintk(fmt, arg...)	if (vbi_debug) \
 	printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg)

 /* ------------------------------------------------------------------ */

 #define VBI_LINE_COUNT     16
 #define VBI_LINE_LENGTH  2048
 #define VBI_SCALE       0x200

 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
 		      int task)
 {
 	struct saa7134_tvnorm *norm = dev->tvnorm;

 	/* setup video scaler */
 	saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
 	saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
 	saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
 	saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
 	saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 &  0xff);
 	saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
 	saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop_0  &  0xff);
 	saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop_0  >> 8);

 	saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
 	saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
 	saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
 	saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);

 	saa_writeb(SAA7134_VBI_H_LEN1(task), buf->vb.width   & 0xff);
 	saa_writeb(SAA7134_VBI_H_LEN2(task), buf->vb.width   >> 8);
 	saa_writeb(SAA7134_VBI_V_LEN1(task), buf->vb.height  & 0xff);
 	saa_writeb(SAA7134_VBI_V_LEN2(task), buf->vb.height  >> 8);

 	saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
 }

 /* ------------------------------------------------------------------ */

 static int buffer_activate(struct saa7134_dev *dev,
 			   struct saa7134_buf *buf,
 			   struct saa7134_buf *next)
 {
 	unsigned long control,base;

 	dprintk("buffer_activate [%p]\n",buf);
 	buf->vb.state = STATE_ACTIVE;
 	buf->top_seen = 0;

 	task_init(dev,buf,TASK_A);
 	task_init(dev,buf,TASK_B);
 	saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
 	saa_writeb(SAA7134_OFMT_DATA_B, 0x06);

 	/* DMA: setup channel 2+3 (= VBI Task A+B) */
 	base    = saa7134_buffer_base(buf);
 	control = SAA7134_RS_CONTROL_BURST_16 |
 		SAA7134_RS_CONTROL_ME |
 		(buf->pt->dma >> 12);
 	saa_writel(SAA7134_RS_BA1(2),base);
 	saa_writel(SAA7134_RS_BA2(2),base + buf->vb.size/2);
 	saa_writel(SAA7134_RS_PITCH(2),buf->vb.width);
 	saa_writel(SAA7134_RS_CONTROL(2),control);
 	saa_writel(SAA7134_RS_BA1(3),base);
 	saa_writel(SAA7134_RS_BA2(3),base + buf->vb.size/2);
 	saa_writel(SAA7134_RS_PITCH(3),buf->vb.width);
 	saa_writel(SAA7134_RS_CONTROL(3),control);

 	/* start DMA */
 	saa7134_set_dmabits(dev);
 	mod_timer(&dev->vbi_q.timeout, jiffies+BUFFER_TIMEOUT);

 	return 0;
 }

 static int buffer_prepare(struct videobuf_queue *q,
 			  struct videobuf_buffer *vb,
 			  enum v4l2_field field)
 {
 	struct saa7134_fh *fh   = q->priv_data;
 	struct saa7134_dev *dev = fh->dev;
 	struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 	struct saa7134_tvnorm *norm = dev->tvnorm;
 	unsigned int lines, llength, size;
 	int err;

 	lines   = norm->vbi_v_stop_0 - norm->vbi_v_start_0 +1;
 	if (lines > VBI_LINE_COUNT)
 		lines = VBI_LINE_COUNT;
 	llength = VBI_LINE_LENGTH;
 	size = lines * llength * 2;
 	if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
 		return -EINVAL;

 	if (buf->vb.size != size)
 		saa7134_dma_free(q,buf);

 	if (STATE_NEEDS_INIT == buf->vb.state) {
 		buf->vb.width  = llength;
 		buf->vb.height = lines;
 		buf->vb.size   = size;
 		buf->pt        = &fh->pt_vbi;

 		err = videobuf_iolock(q,&buf->vb,NULL);
 		if (err)
 			goto oops;
 		err = saa7134_pgtable_build(dev->pci,buf->pt,
 					    buf->vb.dma.sglist,
 					    buf->vb.dma.sglen,
 					    saa7134_buffer_startpage(buf));
 		if (err)
 			goto oops;
 	}
 	buf->vb.state = STATE_PREPARED;
 	buf->activate = buffer_activate;
 	buf->vb.field = field;
 	return 0;

  oops:
 	saa7134_dma_free(q,buf);
 	return err;
 }

 static int
 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 {
 	struct saa7134_fh *fh   = q->priv_data;
 	struct saa7134_dev *dev = fh->dev;
 	int llength,lines;

 	lines   = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 +1;
 	llength = VBI_LINE_LENGTH;
 	*size = lines * llength * 2;
 	if (0 == *count)
 		*count = vbibufs;
 	*count = saa7134_buffer_count(*size,*count);
 	return 0;
 }

 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
 {
 	struct saa7134_fh *fh = q->priv_data;
 	struct saa7134_dev *dev = fh->dev;
 	struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);

 	saa7134_buffer_queue(dev,&dev->vbi_q,buf);
 }

 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 {
 	struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);

 	saa7134_dma_free(q,buf);
 }

 struct videobuf_queue_ops saa7134_vbi_qops = {
 	.buf_setup    = buffer_setup,
 	.buf_prepare  = buffer_prepare,
 	.buf_queue    = buffer_queue,
 	.buf_release  = buffer_release,
 };

 /* ------------------------------------------------------------------ */

 int saa7134_vbi_init1(struct saa7134_dev *dev)
 {
 	INIT_LIST_HEAD(&dev->vbi_q.queue);
 	init_timer(&dev->vbi_q.timeout);
 	dev->vbi_q.timeout.function = saa7134_buffer_timeout;
 	dev->vbi_q.timeout.data     = (unsigned long)(&dev->vbi_q);
 	dev->vbi_q.dev              = dev;

 	if (vbibufs < 2)
 		vbibufs = 2;
 	if (vbibufs > VIDEO_MAX_FRAME)
 		vbibufs = VIDEO_MAX_FRAME;
 	return 0;
 }

 int saa7134_vbi_fini(struct saa7134_dev *dev)
 {
 	/* nothing */
 	return 0;
 }

 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
 {
 	spin_lock(&dev->slock);
 	if (dev->vbi_q.curr) {
 		dev->vbi_fieldcount++;
 		/* make sure we have seen both fields */
 		if ((status & 0x10) == 0x00) {
 			dev->vbi_q.curr->top_seen = 1;
 			goto done;
 		}
 		if (!dev->vbi_q.curr->top_seen)
 			goto done;

 		dev->vbi_q.curr->vb.field_count = dev->vbi_fieldcount;
 		saa7134_buffer_finish(dev,&dev->vbi_q,STATE_DONE);
 	}
 	saa7134_buffer_next(dev,&dev->vbi_q);

  done:
 	spin_unlock(&dev->slock);
 }

 /* ----------------------------------------------------------- */
 /*
  * Local variables:
  * c-basic-offset: 8
  * End:
  */
	/*
	*
	* device driver for philips saa7134 based TV cards
	* video4linux video interface
	*
	* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
	*
	* 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/slab.h>

	#include "saa7134-reg.h"
	#include "saa7134.h"

	/* ------------------------------------------------------------------ */

	static unsigned int vbi_debug = 0;
	module_param(vbi_debug, int, 0644);
	MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");

	static unsigned int vbibufs = 4;
	module_param(vbibufs, int, 0444);
	MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");

	#define dprintk(fmt, arg...) if (vbi_debug) \
	printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg)

	/* ------------------------------------------------------------------ */

	#define VBI_LINE_COUNT 16
	#define VBI_LINE_LENGTH 2048
	#define VBI_SCALE 0x200

	static void task_init(struct saa7134_dev dev, struct saa7134_buf buf,
	int task)
	{
	struct saa7134_tvnorm *norm = dev->tvnorm;

	/* setup video scaler */
	saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start & 0xff);
	saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start >> 8);
	saa_writeb(SAA7134_VBI_H_STOP1(task), norm->h_stop & 0xff);
	saa_writeb(SAA7134_VBI_H_STOP2(task), norm->h_stop >> 8);
	saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 & 0xff);
	saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
	saa_writeb(SAA7134_VBI_V_STOP1(task), norm->vbi_v_stop_0 & 0xff);
	saa_writeb(SAA7134_VBI_V_STOP2(task), norm->vbi_v_stop_0 >> 8);

	saa_writeb(SAA7134_VBI_H_SCALE_INC1(task), VBI_SCALE & 0xff);
	saa_writeb(SAA7134_VBI_H_SCALE_INC2(task), VBI_SCALE >> 8);
	saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task), 0x00);
	saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);

	saa_writeb(SAA7134_VBI_H_LEN1(task), buf->vb.width & 0xff);
	saa_writeb(SAA7134_VBI_H_LEN2(task), buf->vb.width >> 8);
	saa_writeb(SAA7134_VBI_V_LEN1(task), buf->vb.height & 0xff);
	saa_writeb(SAA7134_VBI_V_LEN2(task), buf->vb.height >> 8);

	saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
	}

	/* ------------------------------------------------------------------ */

	static int buffer_activate(struct saa7134_dev *dev,
	struct saa7134_buf *buf,
	struct saa7134_buf *next)
	{
	unsigned long control,base;

	dprintk("buffer_activate [%p]\n",buf);
	buf->vb.state = STATE_ACTIVE;
	buf->top_seen = 0;

	task_init(dev,buf,TASK_A);
	task_init(dev,buf,TASK_B);
	saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
	saa_writeb(SAA7134_OFMT_DATA_B, 0x06);

	/* DMA: setup channel 2+3 (= VBI Task A+B) */
	base = saa7134_buffer_base(buf);
	control = SAA7134_RS_CONTROL_BURST_16 \|
	SAA7134_RS_CONTROL_ME \|
	(buf->pt->dma >> 12);
	saa_writel(SAA7134_RS_BA1(2),base);
	saa_writel(SAA7134_RS_BA2(2),base + buf->vb.size/2);
	saa_writel(SAA7134_RS_PITCH(2),buf->vb.width);
	saa_writel(SAA7134_RS_CONTROL(2),control);
	saa_writel(SAA7134_RS_BA1(3),base);
	saa_writel(SAA7134_RS_BA2(3),base + buf->vb.size/2);
	saa_writel(SAA7134_RS_PITCH(3),buf->vb.width);
	saa_writel(SAA7134_RS_CONTROL(3),control);

	/* start DMA */
	saa7134_set_dmabits(dev);
	mod_timer(&dev->vbi_q.timeout, jiffies+BUFFER_TIMEOUT);

	return 0;
	}

	static int buffer_prepare(struct videobuf_queue *q,
	struct videobuf_buffer *vb,
	enum v4l2_field field)
	{
	struct saa7134_fh *fh = q->priv_data;
	struct saa7134_dev *dev = fh->dev;
	struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
	struct saa7134_tvnorm *norm = dev->tvnorm;
	unsigned int lines, llength, size;
	int err;

	lines = norm->vbi_v_stop_0 - norm->vbi_v_start_0 +1;
	if (lines > VBI_LINE_COUNT)
	lines = VBI_LINE_COUNT;
	llength = VBI_LINE_LENGTH;
	size = lines * llength * 2;
	if (0 != buf->vb.baddr && buf->vb.bsize < size)
	return -EINVAL;

	if (buf->vb.size != size)
	saa7134_dma_free(q,buf);

	if (STATE_NEEDS_INIT == buf->vb.state) {
	buf->vb.width = llength;
	buf->vb.height = lines;
	buf->vb.size = size;
	buf->pt = &fh->pt_vbi;

	err = videobuf_iolock(q,&buf->vb,NULL);
	if (err)
	goto oops;
	err = saa7134_pgtable_build(dev->pci,buf->pt,
	buf->vb.dma.sglist,
	buf->vb.dma.sglen,
	saa7134_buffer_startpage(buf));
	if (err)
	goto oops;
	}
	buf->vb.state = STATE_PREPARED;
	buf->activate = buffer_activate;
	buf->vb.field = field;
	return 0;

	oops:
	saa7134_dma_free(q,buf);
	return err;
	}

	static int
	buffer_setup(struct videobuf_queue q, unsigned int count, unsigned int *size)
	{
	struct saa7134_fh *fh = q->priv_data;
	struct saa7134_dev *dev = fh->dev;
	int llength,lines;

	lines = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 +1;
	llength = VBI_LINE_LENGTH;
	size = lines llength * 2;
	if (0 == *count)
	*count = vbibufs;
	count = saa7134_buffer_count(size,*count);
	return 0;
	}

	static void buffer_queue(struct videobuf_queue q, struct videobuf_buffer vb)
	{
	struct saa7134_fh *fh = q->priv_data;
	struct saa7134_dev *dev = fh->dev;
	struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);

	saa7134_buffer_queue(dev,&dev->vbi_q,buf);
	}

	static void buffer_release(struct videobuf_queue q, struct videobuf_buffer vb)
	{
	struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);

	saa7134_dma_free(q,buf);
	}

	struct videobuf_queue_ops saa7134_vbi_qops = {
	.buf_setup = buffer_setup,
	.buf_prepare = buffer_prepare,
	.buf_queue = buffer_queue,
	.buf_release = buffer_release,
	};

	/* ------------------------------------------------------------------ */

	int saa7134_vbi_init1(struct saa7134_dev *dev)
	{
	INIT_LIST_HEAD(&dev->vbi_q.queue);
	init_timer(&dev->vbi_q.timeout);
	dev->vbi_q.timeout.function = saa7134_buffer_timeout;
	dev->vbi_q.timeout.data = (unsigned long)(&dev->vbi_q);
	dev->vbi_q.dev = dev;

	if (vbibufs < 2)
	vbibufs = 2;
	if (vbibufs > VIDEO_MAX_FRAME)
	vbibufs = VIDEO_MAX_FRAME;
	return 0;
	}

	int saa7134_vbi_fini(struct saa7134_dev *dev)
	{
	/* nothing */
	return 0;
	}

	void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
	{
	spin_lock(&dev->slock);
	if (dev->vbi_q.curr) {
	dev->vbi_fieldcount++;
	/* make sure we have seen both fields */
	if ((status & 0x10) == 0x00) {
	dev->vbi_q.curr->top_seen = 1;
	goto done;
	}
	if (!dev->vbi_q.curr->top_seen)
	goto done;

	dev->vbi_q.curr->vb.field_count = dev->vbi_fieldcount;
	saa7134_buffer_finish(dev,&dev->vbi_q,STATE_DONE);
	}
	saa7134_buffer_next(dev,&dev->vbi_q);

	done:
	spin_unlock(&dev->slock);
	}

	/* ----------------------------------------------------------- */
	/*
	* Local variables:
	* c-basic-offset: 8
	* End:
	*/