Commit 3d15c764 authored by Vandana BN's avatar Vandana BN Committed by Mauro Carvalho Chehab
Browse files

media: vivid: Add touch support 



Support to emulate touch devices in vivid driver.
It generates touch patterns simulating single tap, double tap, triple
tap, move from left to right, zoom in, zoom out, palm press simulating
large area being pressed on screen, and simulating 16 different
simultaneous touch points.The values generated are based on
behavior of the rmi_f54 driver.

Signed-off-by: default avatarVandana BN <bnvandana@gmail.com>
Signed-off-by: default avatarHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+huawei@kernel.org>
parent 8c956f3b

drivers/media/platform/vivid/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -3,7 +3,8 @@ vivid-objs := vivid-core.o vivid-ctrls.o vivid-vid-common.o vivid-vbi-gen.o \ 
		vivid-vid-cap.o vivid-vid-out.o vivid-kthread-cap.o vivid-kthread-out.o \

		vivid-radio-rx.o vivid-radio-tx.o vivid-radio-common.o \

		vivid-rds-gen.o vivid-sdr-cap.o vivid-vbi-cap.o vivid-vbi-out.o \

		vivid-osd.o vivid-meta-cap.o vivid-meta-out.o

		vivid-osd.o vivid-meta-cap.o vivid-meta-out.o \

		vivid-kthread-touch.o vivid-touch-cap.o

ifeq ($(CONFIG_VIDEO_VIVID_CEC),y)

  vivid-objs += vivid-cec.o

endif

drivers/media/platform/vivid/vivid-core.c

+152 −12
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ 
#include "vivid-ctrls.h"

#include "vivid-meta-cap.h"

#include "vivid-meta-out.h"

#include "vivid-touch-cap.h"



#define VIVID_MODULE_NAME "vivid"
@@ -89,6 +90,10 @@ static int meta_out_nr[VIVID_MAX_DEVS] = { [0 ... (VIVID_MAX_DEVS - 1)] = -1 }; 
module_param_array(meta_out_nr, int, NULL, 0444);

MODULE_PARM_DESC(meta_out_nr, " videoX start number, -1 is autodetect");



static int touch_cap_nr[VIVID_MAX_DEVS] = { [0 ... (VIVID_MAX_DEVS - 1)] = -1 };

module_param_array(touch_cap_nr, int, NULL, 0444);

MODULE_PARM_DESC(touch_cap_nr, " v4l-touchX start number, -1 is autodetect");



static int ccs_cap_mode[VIVID_MAX_DEVS] = { [0 ... (VIVID_MAX_DEVS - 1)] = -1 };

module_param_array(ccs_cap_mode, int, NULL, 0444);

MODULE_PARM_DESC(ccs_cap_mode, " capture crop/compose/scale mode:\n"
@@ -110,10 +115,10 @@ MODULE_PARM_DESC(multiplanar, " 1 (default) creates a single planar device, 2 cr 
 * vbi-out + vid-out + meta-cap

 */

static unsigned int node_types[VIVID_MAX_DEVS] = {

	[0 ... (VIVID_MAX_DEVS - 1)] = 0x61d3d

	[0 ... (VIVID_MAX_DEVS - 1)] = 0xe1d3d

};

module_param_array(node_types, uint, NULL, 0444);

MODULE_PARM_DESC(node_types, " node types, default is 0x61d3d. Bitmask with the following meaning:\n"

MODULE_PARM_DESC(node_types, " node types, default is 0xe1d3d. Bitmask with the following meaning:\n"

			     "\t\t    bit 0: Video Capture node\n"

			     "\t\t    bit 2-3: VBI Capture node: 0 = none, 1 = raw vbi, 2 = sliced vbi, 3 = both\n"

			     "\t\t    bit 4: Radio Receiver node\n"
@@ -123,7 +128,8 @@ MODULE_PARM_DESC(node_types, " node types, default is 0x61d3d. Bitmask with the 
			     "\t\t    bit 12: Radio Transmitter node\n"

			     "\t\t    bit 16: Framebuffer for testing overlays\n"

			     "\t\t    bit 17: Metadata Capture node\n"

			     "\t\t    bit 18: Metadata Output node\n");

			     "\t\t    bit 18: Metadata Output node\n"

			     "\t\t    bit 19: Touch Capture node\n");



/* Default: 4 inputs */

static unsigned num_inputs[VIVID_MAX_DEVS] = { [0 ... (VIVID_MAX_DEVS - 1)] = 4 };
@@ -223,7 +229,8 @@ static int vidioc_querycap(struct file *file, void *priv, 
		dev->vbi_cap_caps | dev->vbi_out_caps |

		dev->radio_rx_caps | dev->radio_tx_caps |

		dev->sdr_cap_caps | dev->meta_cap_caps |

		dev->meta_out_caps | V4L2_CAP_DEVICE_CAPS;

		dev->meta_out_caps | dev->touch_cap_caps |

		V4L2_CAP_DEVICE_CAPS;

	return 0;

}
@@ -377,6 +384,8 @@ static int vidioc_g_parm(struct file *file, void *fh, 
{

	struct video_device *vdev = video_devdata(file);



	if (vdev->vfl_type == VFL_TYPE_TOUCH)

		return vivid_g_parm_tch(file, fh, parm);

	if (vdev->vfl_dir == VFL_DIR_RX)

		return vivid_vid_cap_g_parm(file, fh, parm);

	return vivid_vid_out_g_parm(file, fh, parm);
@@ -432,6 +441,74 @@ static __poll_t vivid_radio_poll(struct file *file, struct poll_table_struct *wa 
	return vivid_radio_tx_poll(file, wait);

}



static int vivid_enum_input(struct file *file, void *priv,

			    struct v4l2_input *inp)

{

	struct video_device *vdev = video_devdata(file);



	if (vdev->vfl_type == VFL_TYPE_TOUCH)

		return vivid_enum_input_tch(file, priv, inp);

	return vidioc_enum_input(file, priv, inp);

}



static int vivid_g_input(struct file *file, void *priv, unsigned int *i)

{

	struct video_device *vdev = video_devdata(file);



	if (vdev->vfl_type == VFL_TYPE_TOUCH)

		return vivid_g_input_tch(file, priv, i);

	return vidioc_g_input(file, priv, i);

}



static int vivid_s_input(struct file *file, void *priv, unsigned int i)

{

	struct video_device *vdev = video_devdata(file);



	if (vdev->vfl_type == VFL_TYPE_TOUCH)

		return vivid_s_input_tch(file, priv, i);

	return vidioc_s_input(file, priv, i);

}



static int vivid_enum_fmt_cap(struct file *file, void  *priv,

			      struct v4l2_fmtdesc *f)

{

	struct video_device *vdev = video_devdata(file);



	if (vdev->vfl_type == VFL_TYPE_TOUCH)

		return vivid_enum_fmt_tch(file, priv, f);

	return vivid_enum_fmt_vid(file, priv, f);

}



static int vivid_g_fmt_cap(struct file *file, void *priv,

			   struct v4l2_format *f)

{

	struct video_device *vdev = video_devdata(file);



	if (vdev->vfl_type == VFL_TYPE_TOUCH)

		return vivid_g_fmt_tch(file, priv, f);

	return vidioc_g_fmt_vid_cap(file, priv, f);

}



static int vivid_try_fmt_cap(struct file *file, void *priv,

			     struct v4l2_format *f)

{

	struct video_device *vdev = video_devdata(file);



	if (vdev->vfl_type == VFL_TYPE_TOUCH)

		return vivid_g_fmt_tch(file, priv, f);

	return vidioc_try_fmt_vid_cap(file, priv, f);

}



static int vivid_s_fmt_cap(struct file *file, void *priv,

			   struct v4l2_format *f)

{

	struct video_device *vdev = video_devdata(file);



	if (vdev->vfl_type == VFL_TYPE_TOUCH)

		return vivid_g_fmt_tch(file, priv, f);

	return vidioc_s_fmt_vid_cap(file, priv, f);

}



static bool vivid_is_in_use(struct video_device *vdev)

{

	unsigned long flags;
@@ -453,7 +530,8 @@ static bool vivid_is_last_user(struct vivid_dev *dev) 
			vivid_is_in_use(&dev->radio_rx_dev) +

			vivid_is_in_use(&dev->radio_tx_dev) +

			vivid_is_in_use(&dev->meta_cap_dev) +

			vivid_is_in_use(&dev->meta_out_dev);

			vivid_is_in_use(&dev->meta_out_dev) +

			vivid_is_in_use(&dev->touch_cap_dev);



	return uses == 1;

}
@@ -481,6 +559,7 @@ static int vivid_fop_release(struct file *file) 
		set_bit(V4L2_FL_REGISTERED, &dev->radio_tx_dev.flags);

		set_bit(V4L2_FL_REGISTERED, &dev->meta_cap_dev.flags);

		set_bit(V4L2_FL_REGISTERED, &dev->meta_out_dev.flags);

		set_bit(V4L2_FL_REGISTERED, &dev->touch_cap_dev.flags);

	}

	mutex_unlock(&dev->mutex);

	if (file->private_data == dev->overlay_cap_owner)
@@ -522,10 +601,10 @@ static const struct v4l2_file_operations vivid_radio_fops = { 
static const struct v4l2_ioctl_ops vivid_ioctl_ops = {

	.vidioc_querycap		= vidioc_querycap,



	.vidioc_enum_fmt_vid_cap	= vivid_enum_fmt_vid,

	.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_enum_fmt_vid_cap	= vivid_enum_fmt_cap,

	.vidioc_g_fmt_vid_cap		= vivid_g_fmt_cap,

	.vidioc_try_fmt_vid_cap		= vivid_try_fmt_cap,

	.vidioc_s_fmt_vid_cap		= vivid_s_fmt_cap,

	.vidioc_g_fmt_vid_cap_mplane	= vidioc_g_fmt_vid_cap_mplane,

	.vidioc_try_fmt_vid_cap_mplane	= vidioc_try_fmt_vid_cap_mplane,

	.vidioc_s_fmt_vid_cap_mplane	= vidioc_s_fmt_vid_cap_mplane,
@@ -590,9 +669,9 @@ static const struct v4l2_ioctl_ops vivid_ioctl_ops = { 
	.vidioc_streamon		= vb2_ioctl_streamon,

	.vidioc_streamoff		= vb2_ioctl_streamoff,



	.vidioc_enum_input		= vidioc_enum_input,

	.vidioc_g_input			= vidioc_g_input,

	.vidioc_s_input			= vidioc_s_input,

	.vidioc_enum_input		= vivid_enum_input,

	.vidioc_g_input			= vivid_g_input,

	.vidioc_s_input			= vivid_s_input,

	.vidioc_s_audio			= vidioc_s_audio,

	.vidioc_g_audio			= vidioc_g_audio,

	.vidioc_enumaudio		= vidioc_enumaudio,
@@ -921,6 +1000,9 @@ static int vivid_create_instance(struct platform_device *pdev, int inst) 
			dev->has_scaler_out ? 'Y' : 'N');

	}



	/* do we create a touch capture device */

	dev->has_touch_cap = node_type & 0x80000;



	/* end detecting feature set */



	if (dev->has_vid_cap) {
@@ -994,6 +1076,10 @@ static int vivid_create_instance(struct platform_device *pdev, int inst) 
		if (dev->has_audio_outputs)

			dev->meta_out_caps |= V4L2_CAP_AUDIO;

	}

	/* set up the capabilities of the touch capture device */

	if (dev->has_touch_cap)

		dev->touch_cap_caps = V4L2_CAP_TOUCH | V4L2_CAP_VIDEO_CAPTURE |

				      V4L2_CAP_STREAMING | V4L2_CAP_READWRITE;



	ret = -ENOMEM;

	/* initialize the test pattern generator */
@@ -1129,6 +1215,9 @@ static int vivid_create_instance(struct platform_device *pdev, int inst) 
	v4l2_disable_ioctl(&dev->vbi_out_dev, VIDIOC_G_FREQUENCY);

	v4l2_disable_ioctl(&dev->meta_out_dev, VIDIOC_S_FREQUENCY);

	v4l2_disable_ioctl(&dev->meta_out_dev, VIDIOC_G_FREQUENCY);

	v4l2_disable_ioctl(&dev->touch_cap_dev, VIDIOC_S_PARM);

	v4l2_disable_ioctl(&dev->touch_cap_dev, VIDIOC_ENUM_FRAMESIZES);

	v4l2_disable_ioctl(&dev->touch_cap_dev, VIDIOC_ENUM_FRAMEINTERVALS);



	/* configure internal data */

	dev->fmt_cap = &vivid_formats[0];
@@ -1201,6 +1290,11 @@ static int vivid_create_instance(struct platform_device *pdev, int inst) 
	dev->fb_cap.fmt.bytesperline = dev->src_rect.width * tpg_g_twopixelsize(&dev->tpg, 0) / 2;

	dev->fb_cap.fmt.sizeimage = dev->src_rect.height * dev->fb_cap.fmt.bytesperline;



	/* update touch configuration */

	dev->timeperframe_tch_cap.numerator = 1;

	dev->timeperframe_tch_cap.denominator = 10;

	vivid_set_touch(dev, 0);



	/* initialize locks */

	spin_lock_init(&dev->slock);

	mutex_init(&dev->mutex);
@@ -1213,6 +1307,7 @@ static int vivid_create_instance(struct platform_device *pdev, int inst) 
	INIT_LIST_HEAD(&dev->sdr_cap_active);

	INIT_LIST_HEAD(&dev->meta_cap_active);

	INIT_LIST_HEAD(&dev->meta_out_active);

	INIT_LIST_HEAD(&dev->touch_cap_active);



	INIT_LIST_HEAD(&dev->cec_work_list);

	spin_lock_init(&dev->cec_slock);
@@ -1294,6 +1389,15 @@ static int vivid_create_instance(struct platform_device *pdev, int inst) 
			goto unreg_dev;

	}



	if (dev->has_touch_cap) {

		/* initialize touch_cap queue */

		ret = vivid_create_queue(dev, &dev->vb_touch_cap_q,

					 V4L2_BUF_TYPE_VIDEO_CAPTURE, 1,

					 &vivid_touch_cap_qops);

		if (ret)

			goto unreg_dev;

	}



	if (dev->has_fb) {

		/* Create framebuffer for testing capture/output overlay */

		ret = vivid_fb_init(dev);
@@ -1345,6 +1449,7 @@ static int vivid_create_instance(struct platform_device *pdev, int inst) 
	v4l2_ctrl_handler_setup(&dev->ctrl_hdl_sdr_cap);

	v4l2_ctrl_handler_setup(&dev->ctrl_hdl_meta_cap);

	v4l2_ctrl_handler_setup(&dev->ctrl_hdl_meta_out);

	v4l2_ctrl_handler_setup(&dev->ctrl_hdl_touch_cap);



	/* finally start creating the device nodes */

	if (dev->has_vid_cap) {
@@ -1635,6 +1740,35 @@ static int vivid_create_instance(struct platform_device *pdev, int inst) 
			  video_device_node_name(vfd));

	}



	if (dev->has_touch_cap) {

		vfd = &dev->touch_cap_dev;

		snprintf(vfd->name, sizeof(vfd->name),

			 "vivid-%03d-touch-cap", inst);

		vfd->fops = &vivid_fops;

		vfd->ioctl_ops = &vivid_ioctl_ops;

		vfd->device_caps = dev->touch_cap_caps;

		vfd->release = video_device_release_empty;

		vfd->v4l2_dev = &dev->v4l2_dev;

		vfd->queue = &dev->vb_touch_cap_q;

		vfd->tvnorms = tvnorms_cap;

		vfd->lock = &dev->mutex;

		video_set_drvdata(vfd, dev);

#ifdef CONFIG_MEDIA_CONTROLLER

		dev->touch_cap_pad.flags = MEDIA_PAD_FL_SINK;

		ret = media_entity_pads_init(&vfd->entity, 1,

					     &dev->touch_cap_pad);

		if (ret)

			goto unreg_dev;

#endif

		ret = video_register_device(vfd, VFL_TYPE_TOUCH,

					    touch_cap_nr[inst]);

		if (ret < 0)

			goto unreg_dev;

		v4l2_info(&dev->v4l2_dev,

			  "V4L2 touch capture device registered as %s\n",

			  video_device_node_name(vfd));

	}



#ifdef CONFIG_MEDIA_CONTROLLER

	/* Register the media device */

	ret = media_device_register(&dev->mdev);
@@ -1651,6 +1785,7 @@ static int vivid_create_instance(struct platform_device *pdev, int inst) 
	return 0;



unreg_dev:

	video_unregister_device(&dev->touch_cap_dev);

	video_unregister_device(&dev->meta_out_dev);

	video_unregister_device(&dev->meta_cap_dev);

	video_unregister_device(&dev->radio_tx_dev);
@@ -1778,6 +1913,11 @@ static int vivid_remove(struct platform_device *pdev) 
				  video_device_node_name(&dev->meta_out_dev));

			video_unregister_device(&dev->meta_out_dev);

		}

		if (dev->has_touch_cap) {

			v4l2_info(&dev->v4l2_dev, "unregistering %s\n",

				  video_device_node_name(&dev->touch_cap_dev));

			video_unregister_device(&dev->touch_cap_dev);

		}

		cec_unregister_adapter(dev->cec_rx_adap);

		for (j = 0; j < MAX_OUTPUTS; j++)

			cec_unregister_adapter(dev->cec_tx_adap[j]);

drivers/media/platform/vivid/vivid-core.h

+20 −0
Original line number Diff line number Diff line
@@ -133,6 +133,7 @@ struct vivid_dev { 
	struct media_pad		sdr_cap_pad;

	struct media_pad		meta_cap_pad;

	struct media_pad		meta_out_pad;

	struct media_pad		touch_cap_pad;

#endif

	struct v4l2_ctrl_handler	ctrl_hdl_user_gen;

	struct v4l2_ctrl_handler	ctrl_hdl_user_vid;
@@ -159,6 +160,8 @@ struct vivid_dev { 
	struct v4l2_ctrl_handler	ctrl_hdl_meta_cap;

	struct video_device		meta_out_dev;

	struct v4l2_ctrl_handler	ctrl_hdl_meta_out;

	struct video_device		touch_cap_dev;

	struct v4l2_ctrl_handler	ctrl_hdl_touch_cap;



	spinlock_t			slock;

	struct mutex			mutex;
@@ -173,6 +176,7 @@ struct vivid_dev { 
	u32				radio_tx_caps;

	u32				meta_cap_caps;

	u32				meta_out_caps;

	u32				touch_cap_caps;



	/* supported features */

	bool				multiplanar;
@@ -201,6 +205,7 @@ struct vivid_dev { 
	bool				has_meta_cap;

	bool				has_meta_out;

	bool				has_tv_tuner;

	bool				has_touch_cap;



	bool				can_loop_video;
@@ -404,6 +409,8 @@ struct vivid_dev { 
	struct list_head		vbi_cap_active;

	struct vb2_queue		vb_meta_cap_q;

	struct list_head		meta_cap_active;

	struct vb2_queue		vb_touch_cap_q;

	struct list_head		touch_cap_active;



	/* thread for generating video capture stream */

	struct task_struct		*kthread_vid_cap;
@@ -425,6 +432,19 @@ struct vivid_dev { 
	u32				meta_cap_seq_count;

	bool				meta_cap_streaming;



	/* Touch capture */

	struct task_struct		*kthread_touch_cap;

	unsigned long			jiffies_touch_cap;

	u64				touch_cap_stream_start;

	u32				touch_cap_seq_offset;

	bool				touch_cap_seq_resync;

	u32				touch_cap_seq_start;

	u32				touch_cap_seq_count;

	bool				touch_cap_streaming;

	struct v4l2_fract		timeperframe_tch_cap;

	struct v4l2_pix_format		tch_format;

	int				tch_pat_random;



	/* video output */

	const struct vivid_fmt		*fmt_out;

	struct v4l2_fract		timeperframe_vid_out;

drivers/media/platform/vivid/vivid-ctrls.c

+11 −0
Original line number Diff line number Diff line
@@ -1508,6 +1508,7 @@ int vivid_create_controls(struct vivid_dev *dev, bool show_ccs_cap, 
	struct v4l2_ctrl_handler *hdl_sdr_cap = &dev->ctrl_hdl_sdr_cap;

	struct v4l2_ctrl_handler *hdl_meta_cap = &dev->ctrl_hdl_meta_cap;

	struct v4l2_ctrl_handler *hdl_meta_out = &dev->ctrl_hdl_meta_out;

	struct v4l2_ctrl_handler *hdl_tch_cap = &dev->ctrl_hdl_touch_cap;



	struct v4l2_ctrl_config vivid_ctrl_dv_timings = {

		.ops = &vivid_vid_cap_ctrl_ops,
@@ -1551,6 +1552,8 @@ int vivid_create_controls(struct vivid_dev *dev, bool show_ccs_cap, 
	v4l2_ctrl_new_custom(hdl_meta_cap, &vivid_ctrl_class, NULL);

	v4l2_ctrl_handler_init(hdl_meta_out, 2);

	v4l2_ctrl_new_custom(hdl_meta_out, &vivid_ctrl_class, NULL);

	v4l2_ctrl_handler_init(hdl_tch_cap, 2);

	v4l2_ctrl_new_custom(hdl_tch_cap, &vivid_ctrl_class, NULL);



	/* User Controls */

	dev->volume = v4l2_ctrl_new_std(hdl_user_aud, NULL,
@@ -1904,6 +1907,13 @@ int vivid_create_controls(struct vivid_dev *dev, bool show_ccs_cap, 
			return hdl_meta_out->error;

		dev->meta_out_dev.ctrl_handler = hdl_meta_out;

	}

	if (dev->has_touch_cap) {

		v4l2_ctrl_add_handler(hdl_tch_cap, hdl_user_gen, NULL, false);

		v4l2_ctrl_add_handler(hdl_tch_cap, hdl_streaming, NULL, false);

		if (hdl_tch_cap->error)

			return hdl_tch_cap->error;

		dev->touch_cap_dev.ctrl_handler = hdl_tch_cap;

	}

	return 0;

}
@@ -1925,4 +1935,5 @@ void vivid_free_controls(struct vivid_dev *dev) 
	v4l2_ctrl_handler_free(&dev->ctrl_hdl_fb);

	v4l2_ctrl_handler_free(&dev->ctrl_hdl_meta_cap);

	v4l2_ctrl_handler_free(&dev->ctrl_hdl_meta_out);

	v4l2_ctrl_handler_free(&dev->ctrl_hdl_touch_cap);

}

drivers/media/platform/vivid/vivid-kthread-touch.c

0 → 100644
+181 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * vivid-kthread-touch.c - touch capture thread support functions.

 *

 */



#include <linux/freezer.h>

#include "vivid-core.h"

#include "vivid-kthread-touch.h"

#include "vivid-touch-cap.h"



static noinline_for_stack void vivid_thread_tch_cap_tick(struct vivid_dev *dev,

							 int dropped_bufs)

{

	struct vivid_buffer *tch_cap_buf = NULL;



	spin_lock(&dev->slock);

	if (!list_empty(&dev->touch_cap_active)) {

		tch_cap_buf = list_entry(dev->touch_cap_active.next,

					 struct vivid_buffer, list);

		list_del(&tch_cap_buf->list);

	}



	spin_unlock(&dev->slock);



	if (tch_cap_buf) {

		v4l2_ctrl_request_setup(tch_cap_buf->vb.vb2_buf.req_obj.req,

					&dev->ctrl_hdl_touch_cap);



		vivid_fillbuff_tch(dev, tch_cap_buf);

		v4l2_ctrl_request_complete(tch_cap_buf->vb.vb2_buf.req_obj.req,

					   &dev->ctrl_hdl_touch_cap);

		vb2_buffer_done(&tch_cap_buf->vb.vb2_buf, dev->dqbuf_error ?

				VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);

		dprintk(dev, 2, "touch_cap buffer %d done\n",

			tch_cap_buf->vb.vb2_buf.index);



		tch_cap_buf->vb.vb2_buf.timestamp = ktime_get_ns() + dev->time_wrap_offset;

	}

	dev->dqbuf_error = false;

}



static int vivid_thread_touch_cap(void *data)

{

	struct vivid_dev *dev = data;

	u64 numerators_since_start;

	u64 buffers_since_start;

	u64 next_jiffies_since_start;

	unsigned long jiffies_since_start;

	unsigned long cur_jiffies;

	unsigned int wait_jiffies;

	unsigned int numerator;

	unsigned int denominator;

	int dropped_bufs;



	dprintk(dev, 1, "Touch Capture Thread Start\n");



	set_freezable();



	/* Resets frame counters */

	dev->touch_cap_seq_offset = 0;

	dev->touch_cap_seq_count = 0;

	dev->touch_cap_seq_resync = false;

	dev->jiffies_touch_cap = jiffies;



	for (;;) {

		try_to_freeze();

		if (kthread_should_stop())

			break;



		if (!mutex_trylock(&dev->mutex)) {

			schedule_timeout_uninterruptible(1);

			continue;

		}

		cur_jiffies = jiffies;

		if (dev->touch_cap_seq_resync) {

			dev->jiffies_touch_cap = cur_jiffies;

			dev->touch_cap_seq_offset = dev->touch_cap_seq_count + 1;

			dev->touch_cap_seq_count = 0;

			dev->cap_seq_resync = false;

		}

		denominator = dev->timeperframe_tch_cap.denominator;

		numerator = dev->timeperframe_tch_cap.numerator;



		/* Calculate the number of jiffies since we started streaming */

		jiffies_since_start = cur_jiffies - dev->jiffies_touch_cap;

		/* Get the number of buffers streamed since the start */

		buffers_since_start = (u64)jiffies_since_start * denominator +

				      (HZ * numerator) / 2;

		do_div(buffers_since_start, HZ * numerator);



		/*

		 * After more than 0xf0000000 (rounded down to a multiple of

		 * 'jiffies-per-day' to ease jiffies_to_msecs calculation)

		 * jiffies have passed since we started streaming reset the

		 * counters and keep track of the sequence offset.

		 */

		if (jiffies_since_start > JIFFIES_RESYNC) {

			dev->jiffies_touch_cap = cur_jiffies;

			dev->cap_seq_offset = buffers_since_start;

			buffers_since_start = 0;

		}

		dropped_bufs = buffers_since_start + dev->touch_cap_seq_offset - dev->touch_cap_seq_count;

		dev->touch_cap_seq_count = buffers_since_start + dev->touch_cap_seq_offset;



		vivid_thread_tch_cap_tick(dev, dropped_bufs);



		/*

		 * Calculate the number of 'numerators' streamed

		 * since we started, including the current buffer.

		 */

		numerators_since_start = ++buffers_since_start * numerator;



		/* And the number of jiffies since we started */

		jiffies_since_start = jiffies - dev->jiffies_touch_cap;



		mutex_unlock(&dev->mutex);



		/*

		 * Calculate when that next buffer is supposed to start

		 * in jiffies since we started streaming.

		 */

		next_jiffies_since_start = numerators_since_start * HZ +

					   denominator / 2;

		do_div(next_jiffies_since_start, denominator);

		/* If it is in the past, then just schedule asap */

		if (next_jiffies_since_start < jiffies_since_start)

			next_jiffies_since_start = jiffies_since_start;



		wait_jiffies = next_jiffies_since_start - jiffies_since_start;

		schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1);

	}

	dprintk(dev, 1, "Touch Capture Thread End\n");

	return 0;

}



int vivid_start_generating_touch_cap(struct vivid_dev *dev)

{

	if (dev->kthread_touch_cap) {

		dev->touch_cap_streaming = true;

		return 0;

	}



	dev->kthread_touch_cap = kthread_run(vivid_thread_touch_cap, dev,

					     "%s-tch-cap", dev->v4l2_dev.name);



	if (IS_ERR(dev->kthread_touch_cap)) {

		int err = PTR_ERR(dev->kthread_touch_cap);



		dev->kthread_touch_cap = NULL;

		v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");

		return err;

	}

	dev->touch_cap_streaming = true;

	dprintk(dev, 1, "returning from %s\n", __func__);

	return 0;

}



void vivid_stop_generating_touch_cap(struct vivid_dev *dev)

{

	if (!dev->kthread_touch_cap)

		return;



	dev->touch_cap_streaming = false;



	while (!list_empty(&dev->touch_cap_active)) {

		struct vivid_buffer *buf;



		buf = list_entry(dev->touch_cap_active.next,

				 struct vivid_buffer, list);

		list_del(&buf->list);

		v4l2_ctrl_request_complete(buf->vb.vb2_buf.req_obj.req,

					   &dev->ctrl_hdl_touch_cap);

		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);

		dprintk(dev, 2, "touch_cap buffer %d done\n",

			buf->vb.vb2_buf.index);

	}



	kthread_stop(dev->kthread_touch_cap);

	dev->kthread_touch_cap = NULL;

}