[linux-2.6-block.git] / drivers / media / usb / stk1160 / stk1160-v4l.c

/*
 * STK1160 driver
 *
 * Copyright (C) 2012 Ezequiel Garcia
 * <elezegarcia--a.t--gmail.com>
 *
 * Based on Easycap driver by R.M. Thomas
 *	Copyright (C) 2010 R.M. Thomas
 *	<rmthomas--a.t--sciolus.org>
 *
 * 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.
 *
 */

#include <linux/module.h>
#include <linux/usb.h>
#include <linux/mm.h>
#include <linux/slab.h>

#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-event.h>
#include <media/videobuf2-vmalloc.h>

#include <media/saa7115.h>

#include "stk1160.h"
#include "stk1160-reg.h"

static bool keep_buffers;
module_param(keep_buffers, bool, 0644);
MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");

/* supported video standards */
static struct stk1160_fmt format[] = {
	{
		.name     = "16 bpp YUY2, 4:2:2, packed",
		.fourcc   = V4L2_PIX_FMT_UYVY,
		.depth    = 16,
	}
};

static void stk1160_set_std(struct stk1160 *dev)
{
	int i;

	static struct regval std525[] = {

		/* 720x480 */

		/* Frame start */
		{STK116_CFSPO_STX_L, 0x0000},
		{STK116_CFSPO_STX_H, 0x0000},
		{STK116_CFSPO_STY_L, 0x0003},
		{STK116_CFSPO_STY_H, 0x0000},

		/* Frame end */
		{STK116_CFEPO_ENX_L, 0x05a0},
		{STK116_CFEPO_ENX_H, 0x0005},
		{STK116_CFEPO_ENY_L, 0x00f3},
		{STK116_CFEPO_ENY_H, 0x0000},

		{0xffff, 0xffff}
	};

	static struct regval std625[] = {

		/* 720x576 */

		/* TODO: Each line of frame has some junk at the end */
		/* Frame start */
		{STK116_CFSPO,   0x0000},
		{STK116_CFSPO+1, 0x0000},
		{STK116_CFSPO+2, 0x0001},
		{STK116_CFSPO+3, 0x0000},

		/* Frame end */
		{STK116_CFEPO,   0x05a0},
		{STK116_CFEPO+1, 0x0005},
		{STK116_CFEPO+2, 0x0121},
		{STK116_CFEPO+3, 0x0001},

		{0xffff, 0xffff}
	};

	if (dev->norm & V4L2_STD_525_60) {
		stk1160_dbg("registers to NTSC like standard\n");
		for (i = 0; std525[i].reg != 0xffff; i++)
			stk1160_write_reg(dev, std525[i].reg, std525[i].val);
	} else {
		stk1160_dbg("registers to PAL like standard\n");
		for (i = 0; std625[i].reg != 0xffff; i++)
			stk1160_write_reg(dev, std625[i].reg, std625[i].val);
	}

}

/*
 * Set a new alternate setting.
 * Returns true is dev->max_pkt_size has changed, false otherwise.
 */
static bool stk1160_set_alternate(struct stk1160 *dev)
{
	int i, prev_alt = dev->alt;
	unsigned int min_pkt_size;
	bool new_pkt_size;

	/*
	 * If we don't set right alternate,
	 * then we will get a green screen with junk.
	 */
	min_pkt_size = STK1160_MIN_PKT_SIZE;

	for (i = 0; i < dev->num_alt; i++) {
		/* stop when the selected alt setting offers enough bandwidth */
		if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
			dev->alt = i;
			break;
		/*
		 * otherwise make sure that we end up with the maximum bandwidth
		 * because the min_pkt_size equation might be wrong...
		 */
		} else if (dev->alt_max_pkt_size[i] >
			   dev->alt_max_pkt_size[dev->alt])
			dev->alt = i;
	}

	stk1160_info("setting alternate %d\n", dev->alt);

	if (dev->alt != prev_alt) {
		stk1160_dbg("minimum isoc packet size: %u (alt=%d)\n",
				min_pkt_size, dev->alt);
		stk1160_dbg("setting alt %d with wMaxPacketSize=%u\n",
			       dev->alt, dev->alt_max_pkt_size[dev->alt]);
		usb_set_interface(dev->udev, 0, dev->alt);
	}

	new_pkt_size = dev->max_pkt_size != dev->alt_max_pkt_size[dev->alt];
	dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];

	return new_pkt_size;
}

static int stk1160_start_streaming(struct stk1160 *dev)
{
	bool new_pkt_size;
	int rc = 0;
	int i;

	/* Check device presence */
	if (!dev->udev)
		return -ENODEV;

	if (mutex_lock_interruptible(&dev->v4l_lock))
		return -ERESTARTSYS;
	/*
	 * For some reason it is mandatory to set alternate *first*
	 * and only *then* initialize isoc urbs.
	 * Someone please explain me why ;)
	 */
	new_pkt_size = stk1160_set_alternate(dev);

	/*
	 * We (re)allocate isoc urbs if:
	 * there is no allocated isoc urbs, OR
	 * a new dev->max_pkt_size is detected
	 */
	if (!dev->isoc_ctl.num_bufs || new_pkt_size) {
		rc = stk1160_alloc_isoc(dev);
		if (rc < 0)
			goto out_stop_hw;
	}

	/* submit urbs and enables IRQ */
	for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
		rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL);
		if (rc) {
			stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
			goto out_uninit;
		}
	}

	/* Start saa711x */
	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);

	/* Start stk1160 */
	stk1160_write_reg(dev, STK1160_DCTRL, 0xb3);
	stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);

	stk1160_dbg("streaming started\n");

	mutex_unlock(&dev->v4l_lock);

	return 0;

out_uninit:
	stk1160_uninit_isoc(dev);
out_stop_hw:
	usb_set_interface(dev->udev, 0, 0);
	stk1160_clear_queue(dev);

	mutex_unlock(&dev->v4l_lock);

	return rc;
}

/* Must be called with v4l_lock hold */
static void stk1160_stop_hw(struct stk1160 *dev)
{
	/* If the device is not physically present, there is nothing to do */
	if (!dev->udev)
		return;

	/* set alternate 0 */
	dev->alt = 0;
	stk1160_info("setting alternate %d\n", dev->alt);
	usb_set_interface(dev->udev, 0, 0);

	/* Stop stk1160 */
	stk1160_write_reg(dev, STK1160_DCTRL, 0x00);
	stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);

	/* Stop saa711x */
	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
}

static int stk1160_stop_streaming(struct stk1160 *dev)
{
	if (mutex_lock_interruptible(&dev->v4l_lock))
		return -ERESTARTSYS;

	stk1160_cancel_isoc(dev);

	/*
	 * It is possible to keep buffers around using a module parameter.
	 * This is intended to avoid memory fragmentation.
	 */
	if (!keep_buffers)
		stk1160_free_isoc(dev);

	stk1160_stop_hw(dev);

	stk1160_clear_queue(dev);

	stk1160_dbg("streaming stopped\n");

	mutex_unlock(&dev->v4l_lock);

	return 0;
}

static struct v4l2_file_operations stk1160_fops = {
	.owner = THIS_MODULE,
	.open = v4l2_fh_open,
	.release = vb2_fop_release,
	.read = vb2_fop_read,
	.poll = vb2_fop_poll,
	.mmap = vb2_fop_mmap,
	.unlocked_ioctl = video_ioctl2,
};

/*
 * vidioc ioctls
 */
static int vidioc_querycap(struct file *file,
		void *priv, struct v4l2_capability *cap)
{
	struct stk1160 *dev = video_drvdata(file);

	strcpy(cap->driver, "stk1160");
	strcpy(cap->card, "stk1160");
	usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
	cap->device_caps =
		V4L2_CAP_VIDEO_CAPTURE |
		V4L2_CAP_STREAMING |
		V4L2_CAP_READWRITE;
	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
	return 0;
}

static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
		struct v4l2_fmtdesc *f)
{
	if (f->index != 0)
		return -EINVAL;

	strlcpy(f->description, format[f->index].name, sizeof(f->description));
	f->pixelformat = format[f->index].fourcc;
	return 0;
}

static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
					struct v4l2_format *f)
{
	struct stk1160 *dev = video_drvdata(file);

	f->fmt.pix.width = dev->width;
	f->fmt.pix.height = dev->height;
	f->fmt.pix.field = V4L2_FIELD_INTERLACED;
	f->fmt.pix.pixelformat = dev->fmt->fourcc;
	f->fmt.pix.bytesperline = dev->width * 2;
	f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;

	return 0;
}

static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
			struct v4l2_format *f)
{
	struct stk1160 *dev = video_drvdata(file);

	/*
	 * User can't choose size at his own will,
	 * so we just return him the current size chosen
	 * at standard selection.
	 * TODO: Implement frame scaling?
	 */

	f->fmt.pix.pixelformat = dev->fmt->fourcc;
	f->fmt.pix.width = dev->width;
	f->fmt.pix.height = dev->height;
	f->fmt.pix.field = V4L2_FIELD_INTERLACED;
	f->fmt.pix.bytesperline = dev->width * 2;
	f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;

	return 0;
}

static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
					struct v4l2_format *f)
{
	struct stk1160 *dev = video_drvdata(file);
	struct vb2_queue *q = &dev->vb_vidq;

	if (vb2_is_busy(q))
		return -EBUSY;

	vidioc_try_fmt_vid_cap(file, priv, f);

	/* We don't support any format changes */

	return 0;
}

static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm)
{
	struct stk1160 *dev = video_drvdata(file);
	v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm);
	return 0;
}

static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
{
	struct stk1160 *dev = video_drvdata(file);

	*norm = dev->norm;
	return 0;
}

static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
{
	struct stk1160 *dev = video_drvdata(file);
	struct vb2_queue *q = &dev->vb_vidq;

	if (dev->norm == norm)
		return 0;

	if (vb2_is_busy(q))
		return -EBUSY;

	/* Check device presence */
	if (!dev->udev)
		return -ENODEV;

	/* We need to set this now, before we call stk1160_set_std */
	dev->norm = norm;

	/* This is taken from saa7115 video decoder */
	if (dev->norm & V4L2_STD_525_60) {
		dev->width = 720;
		dev->height = 480;
	} else if (dev->norm & V4L2_STD_625_50) {
		dev->width = 720;
		dev->height = 576;
	} else {
		stk1160_err("invalid standard\n");
		return -EINVAL;
	}

	stk1160_set_std(dev);

	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
			dev->norm);

	return 0;
}


static int vidioc_enum_input(struct file *file, void *priv,
				struct v4l2_input *i)
{
	struct stk1160 *dev = video_drvdata(file);

	if (i->index > STK1160_MAX_INPUT)
		return -EINVAL;

	/* S-Video special handling */
	if (i->index == STK1160_SVIDEO_INPUT)
		sprintf(i->name, "S-Video");
	else
		sprintf(i->name, "Composite%d", i->index);

	i->type = V4L2_INPUT_TYPE_CAMERA;
	i->std = dev->vdev.tvnorms;
	return 0;
}

static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
	struct stk1160 *dev = video_drvdata(file);
	*i = dev->ctl_input;
	return 0;
}

static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
	struct stk1160 *dev = video_drvdata(file);

	if (i > STK1160_MAX_INPUT)
		return -EINVAL;

	dev->ctl_input = i;

	stk1160_select_input(dev);

	return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int vidioc_g_register(struct file *file, void *priv,
			     struct v4l2_dbg_register *reg)
{
	struct stk1160 *dev = video_drvdata(file);
	int rc;
	u8 val;

	/* Match host */
	rc = stk1160_read_reg(dev, reg->reg, &val);
	reg->val = val;
	reg->size = 1;

	return rc;
}

static int vidioc_s_register(struct file *file, void *priv,
			     const struct v4l2_dbg_register *reg)
{
	struct stk1160 *dev = video_drvdata(file);

	/* Match host */
	return stk1160_write_reg(dev, reg->reg, reg->val);
}
#endif

static const struct v4l2_ioctl_ops stk1160_ioctl_ops = {
	.vidioc_querycap      = vidioc_querycap,
	.vidioc_enum_fmt_vid_cap  = vidioc_enum_fmt_vid_cap,
	.vidioc_g_fmt_vid_cap     = vidioc_g_fmt_vid_cap,
	.vidioc_try_fmt_vid_cap   = vidioc_try_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap     = vidioc_s_fmt_vid_cap,
	.vidioc_querystd      = vidioc_querystd,
	.vidioc_g_std         = vidioc_g_std,
	.vidioc_s_std         = vidioc_s_std,
	.vidioc_enum_input    = vidioc_enum_input,
	.vidioc_g_input       = vidioc_g_input,
	.vidioc_s_input       = vidioc_s_input,

	/* vb2 takes care of these */
	.vidioc_reqbufs       = vb2_ioctl_reqbufs,
	.vidioc_querybuf      = vb2_ioctl_querybuf,
	.vidioc_qbuf          = vb2_ioctl_qbuf,
	.vidioc_dqbuf         = vb2_ioctl_dqbuf,
	.vidioc_streamon      = vb2_ioctl_streamon,
	.vidioc_streamoff     = vb2_ioctl_streamoff,

	.vidioc_log_status  = v4l2_ctrl_log_status,
	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,

#ifdef CONFIG_VIDEO_ADV_DEBUG
	.vidioc_g_register = vidioc_g_register,
	.vidioc_s_register = vidioc_s_register,
#endif
};

/********************************************************************/

/*
 * Videobuf2 operations
 */
static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *v4l_fmt,
				unsigned int *nbuffers, unsigned int *nplanes,
				unsigned int sizes[], void *alloc_ctxs[])
{
	struct stk1160 *dev = vb2_get_drv_priv(vq);
	unsigned long size;

	size = dev->width * dev->height * 2;

	/*
	 * Here we can change the number of buffers being requested.
	 * So, we set a minimum and a maximum like this:
	 */
	*nbuffers = clamp_t(unsigned int, *nbuffers,
			STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS);

	/* This means a packed colorformat */
	*nplanes = 1;

	sizes[0] = size;

	stk1160_info("%s: buffer count %d, each %ld bytes\n",
			__func__, *nbuffers, size);

	return 0;
}

static void buffer_queue(struct vb2_buffer *vb)
{
	unsigned long flags;
	struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue);
	struct stk1160_buffer *buf =
		container_of(vb, struct stk1160_buffer, vb);

	spin_lock_irqsave(&dev->buf_lock, flags);
	if (!dev->udev) {
		/*
		 * If the device is disconnected return the buffer to userspace
		 * directly. The next QBUF call will fail with -ENODEV.
		 */
		vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
	} else {

		buf->mem = vb2_plane_vaddr(vb, 0);
		buf->length = vb2_plane_size(vb, 0);
		buf->bytesused = 0;
		buf->pos = 0;

		/*
		 * If buffer length is less from expected then we return
		 * the buffer to userspace directly.
		 */
		if (buf->length < dev->width * dev->height * 2)
			vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
		else
			list_add_tail(&buf->list, &dev->avail_bufs);

	}
	spin_unlock_irqrestore(&dev->buf_lock, flags);
}

static int start_streaming(struct vb2_queue *vq, unsigned int count)
{
	struct stk1160 *dev = vb2_get_drv_priv(vq);
	return stk1160_start_streaming(dev);
}

/* abort streaming and wait for last buffer */
static void stop_streaming(struct vb2_queue *vq)
{
	struct stk1160 *dev = vb2_get_drv_priv(vq);
	stk1160_stop_streaming(dev);
}

static struct vb2_ops stk1160_video_qops = {
	.queue_setup		= queue_setup,
	.buf_queue		= buffer_queue,
	.start_streaming	= start_streaming,
	.stop_streaming		= stop_streaming,
	.wait_prepare		= vb2_ops_wait_prepare,
	.wait_finish		= vb2_ops_wait_finish,
};

static struct video_device v4l_template = {
	.name = "stk1160",
	.tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50,
	.fops = &stk1160_fops,
	.ioctl_ops = &stk1160_ioctl_ops,
	.release = video_device_release_empty,
};

/********************************************************************/

/* Must be called with both v4l_lock and vb_queue_lock hold */
void stk1160_clear_queue(struct stk1160 *dev)
{
	struct stk1160_buffer *buf;
	unsigned long flags;

	/* Release all active buffers */
	spin_lock_irqsave(&dev->buf_lock, flags);
	while (!list_empty(&dev->avail_bufs)) {
		buf = list_first_entry(&dev->avail_bufs,
			struct stk1160_buffer, list);
		list_del(&buf->list);
		vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
		stk1160_info("buffer [%p/%d] aborted\n",
				buf, buf->vb.v4l2_buf.index);
	}
	/* It's important to clear current buffer */
	dev->isoc_ctl.buf = NULL;
	spin_unlock_irqrestore(&dev->buf_lock, flags);
}

int stk1160_vb2_setup(struct stk1160 *dev)
{
	int rc;
	struct vb2_queue *q;

	q = &dev->vb_vidq;
	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR;
	q->drv_priv = dev;
	q->buf_struct_size = sizeof(struct stk1160_buffer);
	q->ops = &stk1160_video_qops;
	q->mem_ops = &vb2_vmalloc_memops;
	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;

	rc = vb2_queue_init(q);
	if (rc < 0)
		return rc;

	/* initialize video dma queue */
	INIT_LIST_HEAD(&dev->avail_bufs);

	return 0;
}

int stk1160_video_register(struct stk1160 *dev)
{
	int rc;

	/* Initialize video_device with a template structure */
	dev->vdev = v4l_template;
	dev->vdev.queue = &dev->vb_vidq;

	/*
	 * Provide mutexes for v4l2 core and for videobuf2 queue.
	 * It will be used to protect *only* v4l2 ioctls.
	 */
	dev->vdev.lock = &dev->v4l_lock;
	dev->vdev.queue->lock = &dev->vb_queue_lock;

	/* This will be used to set video_device parent */
	dev->vdev.v4l2_dev = &dev->v4l2_dev;

	/* NTSC is default */
	dev->norm = V4L2_STD_NTSC_M;
	dev->width = 720;
	dev->height = 480;

	/* set default format */
	dev->fmt = &format[0];
	stk1160_set_std(dev);

	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
			dev->norm);

	video_set_drvdata(&dev->vdev, dev);
	rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
	if (rc < 0) {
		stk1160_err("video_register_device failed (%d)\n", rc);
		return rc;
	}

	v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
		  video_device_node_name(&dev->vdev));

	return 0;
}
Commit	Line	Data
9cb2173e EG	1	/*
	2	* STK1160 driver
	3	*
	4	* Copyright (C) 2012 Ezequiel Garcia
	5	* <elezegarcia--a.t--gmail.com>
	6	*
	7	* Based on Easycap driver by R.M. Thomas
	8	* Copyright (C) 2010 R.M. Thomas
	9	* <rmthomas--a.t--sciolus.org>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/usb.h>
	25	#include <linux/mm.h>
	26	#include <linux/slab.h>
	27
	28	#include <linux/videodev2.h>
	29	#include <media/v4l2-device.h>
	30	#include <media/v4l2-common.h>
	31	#include <media/v4l2-ioctl.h>
	32	#include <media/v4l2-fh.h>
	33	#include <media/v4l2-event.h>
9cb2173e EG	34	#include <media/videobuf2-vmalloc.h>
	35
	36	#include <media/saa7115.h>
	37
	38	#include "stk1160.h"
	39	#include "stk1160-reg.h"
	40
9cb2173e EG	41	static bool keep_buffers;
	42	module_param(keep_buffers, bool, 0644);
	43	MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");
	44
	45	/* supported video standards */
	46	static struct stk1160_fmt format[] = {
	47	{
	48	.name = "16 bpp YUY2, 4:2:2, packed",
	49	.fourcc = V4L2_PIX_FMT_UYVY,
	50	.depth = 16,
	51	}
	52	};
	53
	54	static void stk1160_set_std(struct stk1160 *dev)
	55	{
	56	int i;
	57
	58	static struct regval std525[] = {
	59
	60	/* 720x480 */
	61
	62	/* Frame start */
	63	{STK116_CFSPO_STX_L, 0x0000},
	64	{STK116_CFSPO_STX_H, 0x0000},
	65	{STK116_CFSPO_STY_L, 0x0003},
	66	{STK116_CFSPO_STY_H, 0x0000},
	67
	68	/* Frame end */
	69	{STK116_CFEPO_ENX_L, 0x05a0},
	70	{STK116_CFEPO_ENX_H, 0x0005},
	71	{STK116_CFEPO_ENY_L, 0x00f3},
	72	{STK116_CFEPO_ENY_H, 0x0000},
	73
	74	{0xffff, 0xffff}
	75	};
	76
	77	static struct regval std625[] = {
	78
	79	/* 720x576 */
	80
	81	/* TODO: Each line of frame has some junk at the end */
	82	/* Frame start */
	83	{STK116_CFSPO, 0x0000},
	84	{STK116_CFSPO+1, 0x0000},
	85	{STK116_CFSPO+2, 0x0001},
	86	{STK116_CFSPO+3, 0x0000},
	87
	88	/* Frame end */
	89	{STK116_CFEPO, 0x05a0},
	90	{STK116_CFEPO+1, 0x0005},
	91	{STK116_CFEPO+2, 0x0121},
	92	{STK116_CFEPO+3, 0x0001},
	93
	94	{0xffff, 0xffff}
	95	};
	96
	97	if (dev->norm & V4L2_STD_525_60) {
	98	stk1160_dbg("registers to NTSC like standard\n");
	99	for (i = 0; std525[i].reg != 0xffff; i++)
	100	stk1160_write_reg(dev, std525[i].reg, std525[i].val);
	101	} else {
	102	stk1160_dbg("registers to PAL like standard\n");
	103	for (i = 0; std625[i].reg != 0xffff; i++)
	104	stk1160_write_reg(dev, std625[i].reg, std625[i].val);
105	}
106
107	}
108
109	/*
110	* Set a new alternate setting.
111	* Returns true is dev->max_pkt_size has changed, false otherwise.
112	*/
113	static bool stk1160_set_alternate(struct stk1160 *dev)
114	{
115	int i, prev_alt = dev->alt;
116	unsigned int min_pkt_size;
117	bool new_pkt_size;
118
119	/*
120	* If we don't set right alternate,
121	* then we will get a green screen with junk.
122	*/
123	min_pkt_size = STK1160_MIN_PKT_SIZE;
124
125	for (i = 0; i < dev->num_alt; i++) {
126	/* stop when the selected alt setting offers enough bandwidth */
127	if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
128	dev->alt = i;
129	break;
130	/*
131	* otherwise make sure that we end up with the maximum bandwidth
132	* because the min_pkt_size equation might be wrong...
133	*/
134	} else if (dev->alt_max_pkt_size[i] >
135	dev->alt_max_pkt_size[dev->alt])
136	dev->alt = i;
137	}
138
139	stk1160_info("setting alternate %d\n", dev->alt);
140
141	if (dev->alt != prev_alt) {
142	stk1160_dbg("minimum isoc packet size: %u (alt=%d)\n",
143	min_pkt_size, dev->alt);
144	stk1160_dbg("setting alt %d with wMaxPacketSize=%u\n",
145	dev->alt, dev->alt_max_pkt_size[dev->alt]);
146	usb_set_interface(dev->udev, 0, dev->alt);
147	}
148
149	new_pkt_size = dev->max_pkt_size != dev->alt_max_pkt_size[dev->alt];
150	dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
151
152	return new_pkt_size;
153	}
154
155	static int stk1160_start_streaming(struct stk1160 *dev)
156	{
9cb2173e	157	bool new_pkt_size;
f367cc1e DC	158	int rc = 0;
f367cc1e DC	159	int i;
9cb2173e EG	160
	161	/* Check device presence */
	162	if (!dev->udev)
	163	return -ENODEV;
	164
	165	if (mutex_lock_interruptible(&dev->v4l_lock))
	166	return -ERESTARTSYS;
	167	/*
	168	* For some reason it is mandatory to set alternate first
	169	* and only then initialize isoc urbs.
	170	* Someone please explain me why ;)
	171	*/
	172	new_pkt_size = stk1160_set_alternate(dev);
	173
	174	/*
	175	* We (re)allocate isoc urbs if:
	176	* there is no allocated isoc urbs, OR
	177	* a new dev->max_pkt_size is detected
	178	*/
	179	if (!dev->isoc_ctl.num_bufs \|\| new_pkt_size) {
	180	rc = stk1160_alloc_isoc(dev);
	181	if (rc < 0)
8ac45649	182	goto out_stop_hw;
9cb2173e EG	183	}
	184
	185	/* submit urbs and enables IRQ */
	186	for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
	187	rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL);
	188	if (rc) {
	189	stk1160_err("cannot submit urb[%d] (%d)\n", i, rc);
8ac45649	190	goto out_uninit;
9cb2173e EG	191	}
	192	}
	193
	194	/* Start saa711x */
	195	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1);
	196
	197	/* Start stk1160 */
	198	stk1160_write_reg(dev, STK1160_DCTRL, 0xb3);
	199	stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
	200
	201	stk1160_dbg("streaming started\n");
	202
8ac45649 EG	203	mutex_unlock(&dev->v4l_lock);
	204
	205	return 0;
	206
	207	out_uninit:
	208	stk1160_uninit_isoc(dev);
	209	out_stop_hw:
	210	usb_set_interface(dev->udev, 0, 0);
	211	stk1160_clear_queue(dev);
	212
9cb2173e EG	213	mutex_unlock(&dev->v4l_lock);
9cb2173e EG	214
f367cc1e	215	return rc;
9cb2173e EG	216	}
	217
	218	/* Must be called with v4l_lock hold */
	219	static void stk1160_stop_hw(struct stk1160 *dev)
	220	{
	221	/* If the device is not physically present, there is nothing to do */
	222	if (!dev->udev)
	223	return;
	224
	225	/* set alternate 0 */
	226	dev->alt = 0;
	227	stk1160_info("setting alternate %d\n", dev->alt);
	228	usb_set_interface(dev->udev, 0, 0);
	229
	230	/* Stop stk1160 */
	231	stk1160_write_reg(dev, STK1160_DCTRL, 0x00);
	232	stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00);
	233
	234	/* Stop saa711x */
	235	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0);
	236	}
	237
	238	static int stk1160_stop_streaming(struct stk1160 *dev)
	239	{
	240	if (mutex_lock_interruptible(&dev->v4l_lock))
	241	return -ERESTARTSYS;
	242
	243	stk1160_cancel_isoc(dev);
	244
	245	/*
	246	* It is possible to keep buffers around using a module parameter.
	247	* This is intended to avoid memory fragmentation.
	248	*/
	249	if (!keep_buffers)
	250	stk1160_free_isoc(dev);
	251
	252	stk1160_stop_hw(dev);
	253
	254	stk1160_clear_queue(dev);
	255
	256	stk1160_dbg("streaming stopped\n");
	257
	258	mutex_unlock(&dev->v4l_lock);
	259
	260	return 0;
	261	}
	262
	263	static struct v4l2_file_operations stk1160_fops = {
	264	.owner = THIS_MODULE,
	265	.open = v4l2_fh_open,
	266	.release = vb2_fop_release,
	267	.read = vb2_fop_read,
	268	.poll = vb2_fop_poll,
	269	.mmap = vb2_fop_mmap,
	270	.unlocked_ioctl = video_ioctl2,
	271	};
	272
	273	/*
	274	* vidioc ioctls
	275	*/
	276	static int vidioc_querycap(struct file *file,
	277	void priv, struct v4l2_capability cap)
	278	{
	279	struct stk1160 *dev = video_drvdata(file);
280
281	strcpy(cap->driver, "stk1160");
282	strcpy(cap->card, "stk1160");
283	usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info));
284	cap->device_caps =
285	V4L2_CAP_VIDEO_CAPTURE \|
286	V4L2_CAP_STREAMING \|
287	V4L2_CAP_READWRITE;
288	cap->capabilities = cap->device_caps \| V4L2_CAP_DEVICE_CAPS;
289	return 0;
290	}
291
292	static int vidioc_enum_fmt_vid_cap(struct file file, void priv,
293	struct v4l2_fmtdesc *f)
294	{
295	if (f->index != 0)
296	return -EINVAL;
297
298	strlcpy(f->description, format[f->index].name, sizeof(f->description));
299	f->pixelformat = format[f->index].fourcc;
300	return 0;
301	}
302
303	static int vidioc_g_fmt_vid_cap(struct file file, void priv,
304	struct v4l2_format *f)
305	{
306	struct stk1160 *dev = video_drvdata(file);
307
308	f->fmt.pix.width = dev->width;
309	f->fmt.pix.height = dev->height;
310	f->fmt.pix.field = V4L2_FIELD_INTERLACED;
311	f->fmt.pix.pixelformat = dev->fmt->fourcc;
312	f->fmt.pix.bytesperline = dev->width * 2;
313	f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
314	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
315
316	return 0;
317	}
318
319	static int vidioc_try_fmt_vid_cap(struct file file, void priv,
320	struct v4l2_format *f)
321	{
322	struct stk1160 *dev = video_drvdata(file);
323
9cb2173e EG	324	/*
	325	* User can't choose size at his own will,
	326	* so we just return him the current size chosen
	327	* at standard selection.
	328	* TODO: Implement frame scaling?
	329	*/
	330
c6b69c6c	331	f->fmt.pix.pixelformat = dev->fmt->fourcc;
9cb2173e EG	332	f->fmt.pix.width = dev->width;
	333	f->fmt.pix.height = dev->height;
	334	f->fmt.pix.field = V4L2_FIELD_INTERLACED;
	335	f->fmt.pix.bytesperline = dev->width * 2;
	336	f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
	337	f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
	338
	339	return 0;
	340	}
	341
	342	static int vidioc_s_fmt_vid_cap(struct file file, void priv,
	343	struct v4l2_format *f)
	344	{
	345	struct stk1160 *dev = video_drvdata(file);
	346	struct vb2_queue *q = &dev->vb_vidq;
9cb2173e EG	347
	348	if (vb2_is_busy(q))
	349	return -EBUSY;
	350
c6b69c6c	351	vidioc_try_fmt_vid_cap(file, priv, f);
9cb2173e EG	352
	353	/* We don't support any format changes */
	354
	355	return 0;
	356	}
	357
	358	static int vidioc_querystd(struct file file, void priv, v4l2_std_id *norm)
	359	{
	360	struct stk1160 *dev = video_drvdata(file);
	361	v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm);
	362	return 0;
	363	}
	364
	365	static int vidioc_g_std(struct file file, void priv, v4l2_std_id *norm)
	366	{
	367	struct stk1160 *dev = video_drvdata(file);
	368
	369	*norm = dev->norm;
	370	return 0;
	371	}
	372
314527ac	373	static int vidioc_s_std(struct file file, void priv, v4l2_std_id norm)
9cb2173e EG	374	{
	375	struct stk1160 *dev = video_drvdata(file);
	376	struct vb2_queue *q = &dev->vb_vidq;
	377
b3ba8fa6 EG	378	if (dev->norm == norm)
	379	return 0;
	380
9cb2173e EG	381	if (vb2_is_busy(q))
	382	return -EBUSY;
	383
	384	/* Check device presence */
	385	if (!dev->udev)
	386	return -ENODEV;
	387
	388	/* We need to set this now, before we call stk1160_set_std */
314527ac	389	dev->norm = norm;
9cb2173e EG	390
	391	/* This is taken from saa7115 video decoder */
	392	if (dev->norm & V4L2_STD_525_60) {
	393	dev->width = 720;
	394	dev->height = 480;
	395	} else if (dev->norm & V4L2_STD_625_50) {
	396	dev->width = 720;
	397	dev->height = 576;
	398	} else {
	399	stk1160_err("invalid standard\n");
	400	return -EINVAL;
	401	}
	402
	403	stk1160_set_std(dev);
	404
8774bed9	405	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
9cb2173e EG	406	dev->norm);
	407
	408	return 0;
	409	}
	410
	411
	412	static int vidioc_enum_input(struct file file, void priv,
	413	struct v4l2_input *i)
	414	{
	415	struct stk1160 *dev = video_drvdata(file);
	416
	417	if (i->index > STK1160_MAX_INPUT)
	418	return -EINVAL;
	419
56a960bf EG	420	/* S-Video special handling */
	421	if (i->index == STK1160_SVIDEO_INPUT)
	422	sprintf(i->name, "S-Video");
	423	else
	424	sprintf(i->name, "Composite%d", i->index);
	425
9cb2173e EG	426	i->type = V4L2_INPUT_TYPE_CAMERA;
	427	i->std = dev->vdev.tvnorms;
	428	return 0;
	429	}
	430
	431	static int vidioc_g_input(struct file file, void priv, unsigned int *i)
	432	{
	433	struct stk1160 *dev = video_drvdata(file);
	434	*i = dev->ctl_input;
	435	return 0;
	436	}
	437
	438	static int vidioc_s_input(struct file file, void priv, unsigned int i)
	439	{
	440	struct stk1160 *dev = video_drvdata(file);
	441
9cb2173e EG	442	if (i > STK1160_MAX_INPUT)
	443	return -EINVAL;
	444
	445	dev->ctl_input = i;
	446
	447	stk1160_select_input(dev);
	448
	449	return 0;
	450	}
	451
9cb2173e EG	452	#ifdef CONFIG_VIDEO_ADV_DEBUG
	453	static int vidioc_g_register(struct file file, void priv,
	454	struct v4l2_dbg_register *reg)
	455	{
	456	struct stk1160 *dev = video_drvdata(file);
	457	int rc;
	458	u8 val;
	459
9cb2173e EG	460	/* Match host */
	461	rc = stk1160_read_reg(dev, reg->reg, &val);
	462	reg->val = val;
	463	reg->size = 1;
	464
	465	return rc;
	466	}
	467
	468	static int vidioc_s_register(struct file file, void priv,
977ba3b1	469	const struct v4l2_dbg_register *reg)
9cb2173e EG	470	{
	471	struct stk1160 *dev = video_drvdata(file);
	472
9cb2173e	473	/* Match host */
4580278f	474	return stk1160_write_reg(dev, reg->reg, reg->val);
9cb2173e EG	475	}
	476	#endif
	477
	478	static const struct v4l2_ioctl_ops stk1160_ioctl_ops = {
	479	.vidioc_querycap = vidioc_querycap,
	480	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
	481	.vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
	482	.vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
	483	.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
	484	.vidioc_querystd = vidioc_querystd,
	485	.vidioc_g_std = vidioc_g_std,
	486	.vidioc_s_std = vidioc_s_std,
	487	.vidioc_enum_input = vidioc_enum_input,
	488	.vidioc_g_input = vidioc_g_input,
	489	.vidioc_s_input = vidioc_s_input,
	490
	491	/* vb2 takes care of these */
	492	.vidioc_reqbufs = vb2_ioctl_reqbufs,
	493	.vidioc_querybuf = vb2_ioctl_querybuf,
	494	.vidioc_qbuf = vb2_ioctl_qbuf,
	495	.vidioc_dqbuf = vb2_ioctl_dqbuf,
	496	.vidioc_streamon = vb2_ioctl_streamon,
	497	.vidioc_streamoff = vb2_ioctl_streamoff,
	498
	499	.vidioc_log_status = v4l2_ctrl_log_status,
	500	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
	501	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
9cb2173e EG	502
	503	#ifdef CONFIG_VIDEO_ADV_DEBUG
	504	.vidioc_g_register = vidioc_g_register,
	505	.vidioc_s_register = vidioc_s_register,
	506	#endif
	507	};
	508
	509	/********************************************************************/
	510
	511	/*
	512	* Videobuf2 operations
	513	*/
	514	static int queue_setup(struct vb2_queue vq, const struct v4l2_format v4l_fmt,
	515	unsigned int nbuffers, unsigned int nplanes,
	516	unsigned int sizes[], void *alloc_ctxs[])
	517	{
	518	struct stk1160 *dev = vb2_get_drv_priv(vq);
	519	unsigned long size;
	520
	521	size = dev->width * dev->height * 2;
	522
	523	/*
	524	* Here we can change the number of buffers being requested.
	525	* So, we set a minimum and a maximum like this:
	526	*/
	527	nbuffers = clamp_t(unsigned int, nbuffers,
	528	STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS);
	529
	530	/* This means a packed colorformat */
	531	*nplanes = 1;
	532
	533	sizes[0] = size;
	534
	535	stk1160_info("%s: buffer count %d, each %ld bytes\n",
	536	__func__, *nbuffers, size);
	537
	538	return 0;
	539	}
	540
	541	static void buffer_queue(struct vb2_buffer *vb)
	542	{
	543	unsigned long flags;
	544	struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue);
	545	struct stk1160_buffer *buf =
	546	container_of(vb, struct stk1160_buffer, vb);
	547
	548	spin_lock_irqsave(&dev->buf_lock, flags);
	549	if (!dev->udev) {
	550	/*
	551	* If the device is disconnected return the buffer to userspace
	552	* directly. The next QBUF call will fail with -ENODEV.
	553	*/
	554	vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
	555	} else {
	556
	557	buf->mem = vb2_plane_vaddr(vb, 0);
	558	buf->length = vb2_plane_size(vb, 0);
	559	buf->bytesused = 0;
	560	buf->pos = 0;
	561
	562	/*
	563	* If buffer length is less from expected then we return
	564	* the buffer to userspace directly.
	565	*/
566	if (buf->length < dev->width * dev->height * 2)
567	vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
568	else
569	list_add_tail(&buf->list, &dev->avail_bufs);
570
571	}
572	spin_unlock_irqrestore(&dev->buf_lock, flags);
573	}
574
575	static int start_streaming(struct vb2_queue *vq, unsigned int count)
576	{
577	struct stk1160 *dev = vb2_get_drv_priv(vq);
578	return stk1160_start_streaming(dev);
579	}
580
581	/* abort streaming and wait for last buffer */
e37559b2	582	static void stop_streaming(struct vb2_queue *vq)
9cb2173e EG	583	{
9cb2173e EG	584	struct stk1160 *dev = vb2_get_drv_priv(vq);
e37559b2	585	stk1160_stop_streaming(dev);
9cb2173e EG	586	}
	587
	588	static struct vb2_ops stk1160_video_qops = {
	589	.queue_setup = queue_setup,
	590	.buf_queue = buffer_queue,
	591	.start_streaming = start_streaming,
	592	.stop_streaming = stop_streaming,
	593	.wait_prepare = vb2_ops_wait_prepare,
	594	.wait_finish = vb2_ops_wait_finish,
	595	};
	596
	597	static struct video_device v4l_template = {
	598	.name = "stk1160",
	599	.tvnorms = V4L2_STD_525_60 \| V4L2_STD_625_50,
	600	.fops = &stk1160_fops,
	601	.ioctl_ops = &stk1160_ioctl_ops,
	602	.release = video_device_release_empty,
	603	};
	604
	605	/********************************************************************/
	606
	607	/* Must be called with both v4l_lock and vb_queue_lock hold */
	608	void stk1160_clear_queue(struct stk1160 *dev)
	609	{
	610	struct stk1160_buffer *buf;
	611	unsigned long flags;
	612
	613	/* Release all active buffers */
	614	spin_lock_irqsave(&dev->buf_lock, flags);
	615	while (!list_empty(&dev->avail_bufs)) {
	616	buf = list_first_entry(&dev->avail_bufs,
	617	struct stk1160_buffer, list);
	618	list_del(&buf->list);
	619	vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
	620	stk1160_info("buffer [%p/%d] aborted\n",
	621	buf, buf->vb.v4l2_buf.index);
	622	}
	623	/* It's important to clear current buffer */
	624	dev->isoc_ctl.buf = NULL;
	625	spin_unlock_irqrestore(&dev->buf_lock, flags);
	626	}
	627
	628	int stk1160_vb2_setup(struct stk1160 *dev)
	629	{
	630	int rc;
	631	struct vb2_queue *q;
	632
	633	q = &dev->vb_vidq;
9cb2173e EG	634	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	635	q->io_modes = VB2_READ \| VB2_MMAP \| VB2_USERPTR;
	636	q->drv_priv = dev;
	637	q->buf_struct_size = sizeof(struct stk1160_buffer);
	638	q->ops = &stk1160_video_qops;
	639	q->mem_ops = &vb2_vmalloc_memops;
ade48681	640	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
9cb2173e EG	641
	642	rc = vb2_queue_init(q);
	643	if (rc < 0)
	644	return rc;
	645
	646	/* initialize video dma queue */
	647	INIT_LIST_HEAD(&dev->avail_bufs);
	648
	649	return 0;
	650	}
	651
	652	int stk1160_video_register(struct stk1160 *dev)
	653	{
	654	int rc;
	655
	656	/* Initialize video_device with a template structure */
	657	dev->vdev = v4l_template;
9cb2173e EG	658	dev->vdev.queue = &dev->vb_vidq;
	659
	660	/*
	661	* Provide mutexes for v4l2 core and for videobuf2 queue.
	662	* It will be used to protect only v4l2 ioctls.
	663	*/
	664	dev->vdev.lock = &dev->v4l_lock;
	665	dev->vdev.queue->lock = &dev->vb_queue_lock;
	666
	667	/* This will be used to set video_device parent */
	668	dev->vdev.v4l2_dev = &dev->v4l2_dev;
9cb2173e EG	669
	670	/* NTSC is default */
	671	dev->norm = V4L2_STD_NTSC_M;
	672	dev->width = 720;
	673	dev->height = 480;
	674
	675	/* set default format */
	676	dev->fmt = &format[0];
	677	stk1160_set_std(dev);
	678
8774bed9	679	v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
9cb2173e EG	680	dev->norm);
	681
	682	video_set_drvdata(&dev->vdev, dev);
	683	rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1);
	684	if (rc < 0) {
	685	stk1160_err("video_register_device failed (%d)\n", rc);
	686	return rc;
	687	}
	688
	689	v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
	690	video_device_node_name(&dev->vdev));
	691
	692	return 0;
	693	}