[linux-block.git] / drivers / media / test-drivers / vivid / vivid-touch-cap.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * vivid-touch-cap.c - touch support functions.
 */

#include "vivid-core.h"
#include "vivid-kthread-touch.h"
#include "vivid-vid-common.h"
#include "vivid-touch-cap.h"

static int touch_cap_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
				 unsigned int *nplanes, unsigned int sizes[],
				 struct device *alloc_devs[])
{
	struct vivid_dev *dev = vb2_get_drv_priv(vq);
	struct v4l2_pix_format *f = &dev->tch_format;
	unsigned int size = f->sizeimage;

	if (*nplanes) {
		if (sizes[0] < size)
			return -EINVAL;
	} else {
		sizes[0] = size;
	}

	if (vq->num_buffers + *nbuffers < 2)
		*nbuffers = 2 - vq->num_buffers;

	*nplanes = 1;
	return 0;
}

static int touch_cap_buf_prepare(struct vb2_buffer *vb)
{
	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
	struct v4l2_pix_format *f = &dev->tch_format;
	unsigned int size = f->sizeimage;

	if (dev->buf_prepare_error) {
		/*
		 * Error injection: test what happens if buf_prepare() returns
		 * an error.
		 */
		dev->buf_prepare_error = false;
		return -EINVAL;
	}
	if (vb2_plane_size(vb, 0) < size) {
		dprintk(dev, 1, "%s data will not fit into plane (%lu < %u)\n",
			__func__, vb2_plane_size(vb, 0), size);
		return -EINVAL;
	}
	vb2_set_plane_payload(vb, 0, size);

	return 0;
}

static void touch_cap_buf_queue(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
	struct vivid_buffer *buf = container_of(vbuf, struct vivid_buffer, vb);

	vbuf->field = V4L2_FIELD_NONE;
	spin_lock(&dev->slock);
	list_add_tail(&buf->list, &dev->touch_cap_active);
	spin_unlock(&dev->slock);
}

static int touch_cap_start_streaming(struct vb2_queue *vq, unsigned int count)
{
	struct vivid_dev *dev = vb2_get_drv_priv(vq);
	int err;

	dev->touch_cap_seq_count = 0;
	if (dev->start_streaming_error) {
		dev->start_streaming_error = false;
		err = -EINVAL;
	} else {
		err = vivid_start_generating_touch_cap(dev);
	}
	if (err) {
		struct vivid_buffer *buf, *tmp;

		list_for_each_entry_safe(buf, tmp,
					 &dev->touch_cap_active, list) {
			list_del(&buf->list);
			vb2_buffer_done(&buf->vb.vb2_buf,
					VB2_BUF_STATE_QUEUED);
		}
	}
	return err;
}

/* abort streaming and wait for last buffer */
static void touch_cap_stop_streaming(struct vb2_queue *vq)
{
	struct vivid_dev *dev = vb2_get_drv_priv(vq);

	vivid_stop_generating_touch_cap(dev);
}

static void touch_cap_buf_request_complete(struct vb2_buffer *vb)
{
	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);

	v4l2_ctrl_request_complete(vb->req_obj.req, &dev->ctrl_hdl_touch_cap);
}

const struct vb2_ops vivid_touch_cap_qops = {
	.queue_setup		= touch_cap_queue_setup,
	.buf_prepare		= touch_cap_buf_prepare,
	.buf_queue		= touch_cap_buf_queue,
	.start_streaming	= touch_cap_start_streaming,
	.stop_streaming		= touch_cap_stop_streaming,
	.buf_request_complete	= touch_cap_buf_request_complete,
	.wait_prepare		= vb2_ops_wait_prepare,
	.wait_finish		= vb2_ops_wait_finish,
};

int vivid_enum_fmt_tch(struct file *file, void  *priv, struct v4l2_fmtdesc *f)
{
	if (f->index)
		return -EINVAL;

	f->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
	return 0;
}

int vivid_g_fmt_tch(struct file *file, void *priv, struct v4l2_format *f)
{
	struct vivid_dev *dev = video_drvdata(file);

	if (dev->multiplanar)
		return -ENOTTY;
	f->fmt.pix = dev->tch_format;
	return 0;
}

int vivid_g_fmt_tch_mplane(struct file *file, void *priv, struct v4l2_format *f)
{
	struct vivid_dev *dev = video_drvdata(file);
	struct v4l2_format sp_fmt;

	if (!dev->multiplanar)
		return -ENOTTY;
	sp_fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	sp_fmt.fmt.pix = dev->tch_format;
	fmt_sp2mp(&sp_fmt, f);
	return 0;
}

int vivid_g_parm_tch(struct file *file, void *priv,
		     struct v4l2_streamparm *parm)
{
	struct vivid_dev *dev = video_drvdata(file);

	if (parm->type != (dev->multiplanar ?
			   V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE :
			   V4L2_BUF_TYPE_VIDEO_CAPTURE))
		return -EINVAL;

	parm->parm.capture.capability   = V4L2_CAP_TIMEPERFRAME;
	parm->parm.capture.timeperframe = dev->timeperframe_tch_cap;
	parm->parm.capture.readbuffers  = 1;
	return 0;
}

int vivid_enum_input_tch(struct file *file, void *priv, struct v4l2_input *inp)
{
	if (inp->index)
		return -EINVAL;

	inp->type = V4L2_INPUT_TYPE_TOUCH;
	strscpy(inp->name, "Vivid Touch", sizeof(inp->name));
	inp->capabilities = 0;
	return 0;
}

int vivid_g_input_tch(struct file *file, void *priv, unsigned int *i)
{
	*i = 0;
	return 0;
}

int vivid_set_touch(struct vivid_dev *dev, unsigned int i)
{
	struct v4l2_pix_format *f = &dev->tch_format;

	if (i)
		return -EINVAL;

	f->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
	f->width =  VIVID_TCH_WIDTH;
	f->height = VIVID_TCH_HEIGHT;
	f->field = V4L2_FIELD_NONE;
	f->colorspace = V4L2_COLORSPACE_RAW;
	f->bytesperline = f->width * sizeof(s16);
	f->sizeimage = f->width * f->height * sizeof(s16);
	return 0;
}

int vivid_s_input_tch(struct file *file, void *priv, unsigned int i)
{
	return vivid_set_touch(video_drvdata(file), i);
}

static void vivid_fill_buff_noise(__s16 *tch_buf, int size)
{
	int i;

	/* Fill 10% of the values within range -3 and 3, zero the others */
	for (i = 0; i < size; i++) {
		unsigned int rand = get_random_u32();

		if (rand % 10)
			tch_buf[i] = 0;
		else
			tch_buf[i] = (rand / 10) % 7 - 3;
	}
}

static inline int get_random_pressure(void)
{
	return prandom_u32_max(VIVID_PRESSURE_LIMIT);
}

static void vivid_tch_buf_set(struct v4l2_pix_format *f,
			      __s16 *tch_buf,
			      int index)
{
	unsigned int x = index % f->width;
	unsigned int y = index / f->width;
	unsigned int offset = VIVID_MIN_PRESSURE;

	tch_buf[index] = offset + get_random_pressure();
	offset /= 2;
	if (x)
		tch_buf[index - 1] = offset + get_random_pressure();
	if (x < f->width - 1)
		tch_buf[index + 1] = offset + get_random_pressure();
	if (y)
		tch_buf[index - f->width] = offset + get_random_pressure();
	if (y < f->height - 1)
		tch_buf[index + f->width] = offset + get_random_pressure();
	offset /= 2;
	if (x && y)
		tch_buf[index - 1 - f->width] = offset + get_random_pressure();
	if (x < f->width - 1 && y)
		tch_buf[index + 1 - f->width] = offset + get_random_pressure();
	if (x && y < f->height - 1)
		tch_buf[index - 1 + f->width] = offset + get_random_pressure();
	if (x < f->width - 1 && y < f->height - 1)
		tch_buf[index + 1 + f->width] = offset + get_random_pressure();
}

void vivid_fillbuff_tch(struct vivid_dev *dev, struct vivid_buffer *buf)
{
	struct v4l2_pix_format *f = &dev->tch_format;
	int size = f->width * f->height;
	int x, y, xstart, ystart, offset_x, offset_y;
	unsigned int test_pattern, test_pat_idx, rand;

	__s16 *tch_buf = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);

	buf->vb.sequence = dev->touch_cap_with_seq_wrap_count;
	test_pattern = (buf->vb.sequence / TCH_SEQ_COUNT) % TEST_CASE_MAX;
	test_pat_idx = buf->vb.sequence % TCH_SEQ_COUNT;

	vivid_fill_buff_noise(tch_buf, size);

	if (test_pat_idx >= TCH_PATTERN_COUNT)
		return;

	if (test_pat_idx == 0)
		dev->tch_pat_random = get_random_u32();
	rand = dev->tch_pat_random;

	switch (test_pattern) {
	case SINGLE_TAP:
		if (test_pat_idx == 2)
			vivid_tch_buf_set(f, tch_buf, rand % size);
		break;
	case DOUBLE_TAP:
		if (test_pat_idx == 2 || test_pat_idx == 4)
			vivid_tch_buf_set(f, tch_buf, rand % size);
		break;
	case TRIPLE_TAP:
		if (test_pat_idx == 2 || test_pat_idx == 4 || test_pat_idx == 6)
			vivid_tch_buf_set(f, tch_buf, rand % size);
		break;
	case MOVE_LEFT_TO_RIGHT:
		vivid_tch_buf_set(f, tch_buf,
				  (rand % f->height) * f->width +
				  test_pat_idx *
				  (f->width / TCH_PATTERN_COUNT));
		break;
	case ZOOM_IN:
		x = f->width / 2;
		y = f->height / 2;
		offset_x = ((TCH_PATTERN_COUNT - 1 - test_pat_idx) * x) /
				TCH_PATTERN_COUNT;
		offset_y = ((TCH_PATTERN_COUNT - 1 - test_pat_idx) * y) /
				TCH_PATTERN_COUNT;
		vivid_tch_buf_set(f, tch_buf,
				  (x - offset_x) + f->width * (y - offset_y));
		vivid_tch_buf_set(f, tch_buf,
				  (x + offset_x) + f->width * (y + offset_y));
		break;
	case ZOOM_OUT:
		x = f->width / 2;
		y = f->height / 2;
		offset_x = (test_pat_idx * x) / TCH_PATTERN_COUNT;
		offset_y = (test_pat_idx * y) / TCH_PATTERN_COUNT;
		vivid_tch_buf_set(f, tch_buf,
				  (x - offset_x) + f->width * (y - offset_y));
		vivid_tch_buf_set(f, tch_buf,
				  (x + offset_x) + f->width * (y + offset_y));
		break;
	case PALM_PRESS:
		for (x = 0; x < f->width; x++)
			for (y = f->height / 2; y < f->height; y++)
				tch_buf[x + f->width * y] = VIVID_MIN_PRESSURE +
							get_random_pressure();
		break;
	case MULTIPLE_PRESS:
		/* 16 pressure points */
		for (y = 0; y < 4; y++) {
			for (x = 0; x < 4; x++) {
				ystart = (y * f->height) / 4 + f->height / 8;
				xstart = (x * f->width) / 4 + f->width / 8;
				vivid_tch_buf_set(f, tch_buf,
						  ystart * f->width + xstart);
			}
		}
		break;
	}
#ifdef __BIG_ENDIAN__
	for (x = 0; x < size; x++)
		tch_buf[x] = (__force s16)__cpu_to_le16((u16)tch_buf[x]);
#endif
}
Commit	Line	Data
3d15c764 VB	1	// SPDX-License-Identifier: GPL-2.0-only
	2	/*
	3	* vivid-touch-cap.c - touch support functions.
	4	*/
	5
	6	#include "vivid-core.h"
	7	#include "vivid-kthread-touch.h"
0885acd7	8	#include "vivid-vid-common.h"
3d15c764 VB	9	#include "vivid-touch-cap.h"
	10
	11	static int touch_cap_queue_setup(struct vb2_queue vq, unsigned int nbuffers,
	12	unsigned int *nplanes, unsigned int sizes[],
	13	struct device *alloc_devs[])
	14	{
	15	struct vivid_dev *dev = vb2_get_drv_priv(vq);
	16	struct v4l2_pix_format *f = &dev->tch_format;
	17	unsigned int size = f->sizeimage;
	18
	19	if (*nplanes) {
	20	if (sizes[0] < size)
	21	return -EINVAL;
	22	} else {
	23	sizes[0] = size;
	24	}
	25
	26	if (vq->num_buffers + *nbuffers < 2)
	27	*nbuffers = 2 - vq->num_buffers;
	28
	29	*nplanes = 1;
	30	return 0;
	31	}
	32
	33	static int touch_cap_buf_prepare(struct vb2_buffer *vb)
	34	{
	35	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
	36	struct v4l2_pix_format *f = &dev->tch_format;
	37	unsigned int size = f->sizeimage;
	38
	39	if (dev->buf_prepare_error) {
	40	/*
	41	* Error injection: test what happens if buf_prepare() returns
	42	* an error.
	43	*/
	44	dev->buf_prepare_error = false;
	45	return -EINVAL;
	46	}
	47	if (vb2_plane_size(vb, 0) < size) {
	48	dprintk(dev, 1, "%s data will not fit into plane (%lu < %u)\n",
	49	__func__, vb2_plane_size(vb, 0), size);
	50	return -EINVAL;
	51	}
	52	vb2_set_plane_payload(vb, 0, size);
	53
	54	return 0;
	55	}
	56
	57	static void touch_cap_buf_queue(struct vb2_buffer *vb)
	58	{
	59	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	60	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
	61	struct vivid_buffer *buf = container_of(vbuf, struct vivid_buffer, vb);
	62
3ff4348f	63	vbuf->field = V4L2_FIELD_NONE;
3d15c764 VB	64	spin_lock(&dev->slock);
	65	list_add_tail(&buf->list, &dev->touch_cap_active);
	66	spin_unlock(&dev->slock);
	67	}
	68
	69	static int touch_cap_start_streaming(struct vb2_queue *vq, unsigned int count)
	70	{
	71	struct vivid_dev *dev = vb2_get_drv_priv(vq);
	72	int err;
	73
	74	dev->touch_cap_seq_count = 0;
	75	if (dev->start_streaming_error) {
	76	dev->start_streaming_error = false;
	77	err = -EINVAL;
	78	} else {
	79	err = vivid_start_generating_touch_cap(dev);
	80	}
	81	if (err) {
	82	struct vivid_buffer buf, tmp;
	83
	84	list_for_each_entry_safe(buf, tmp,
	85	&dev->touch_cap_active, list) {
	86	list_del(&buf->list);
	87	vb2_buffer_done(&buf->vb.vb2_buf,
	88	VB2_BUF_STATE_QUEUED);
	89	}
	90	}
	91	return err;
	92	}
	93
	94	/* abort streaming and wait for last buffer */
	95	static void touch_cap_stop_streaming(struct vb2_queue *vq)
	96	{
	97	struct vivid_dev *dev = vb2_get_drv_priv(vq);
	98
	99	vivid_stop_generating_touch_cap(dev);
	100	}
	101
	102	static void touch_cap_buf_request_complete(struct vb2_buffer *vb)
	103	{
	104	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
	105
	106	v4l2_ctrl_request_complete(vb->req_obj.req, &dev->ctrl_hdl_touch_cap);
	107	}
	108
	109	const struct vb2_ops vivid_touch_cap_qops = {
	110	.queue_setup = touch_cap_queue_setup,
	111	.buf_prepare = touch_cap_buf_prepare,
	112	.buf_queue = touch_cap_buf_queue,
	113	.start_streaming = touch_cap_start_streaming,
	114	.stop_streaming = touch_cap_stop_streaming,
	115	.buf_request_complete = touch_cap_buf_request_complete,
	116	.wait_prepare = vb2_ops_wait_prepare,
	117	.wait_finish = vb2_ops_wait_finish,
	118	};
	119
	120	int vivid_enum_fmt_tch(struct file file, void priv, struct v4l2_fmtdesc *f)
	121	{
	122	if (f->index)
	123	return -EINVAL;
	124
	125	f->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
	126	return 0;
	127	}
128
129	int vivid_g_fmt_tch(struct file file, void priv, struct v4l2_format *f)
130	{
131	struct vivid_dev *dev = video_drvdata(file);
132
0885acd7 HV	133	if (dev->multiplanar)
0885acd7 HV	134	return -ENOTTY;
3d15c764 VB	135	f->fmt.pix = dev->tch_format;
	136	return 0;
	137	}
	138
0885acd7 HV	139	int vivid_g_fmt_tch_mplane(struct file file, void priv, struct v4l2_format *f)
	140	{
	141	struct vivid_dev *dev = video_drvdata(file);
	142	struct v4l2_format sp_fmt;
	143
	144	if (!dev->multiplanar)
	145	return -ENOTTY;
	146	sp_fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	147	sp_fmt.fmt.pix = dev->tch_format;
	148	fmt_sp2mp(&sp_fmt, f);
	149	return 0;
	150	}
	151
3d15c764 VB	152	int vivid_g_parm_tch(struct file file, void priv,
	153	struct v4l2_streamparm *parm)
	154	{
	155	struct vivid_dev *dev = video_drvdata(file);
	156
0885acd7 HV	157	if (parm->type != (dev->multiplanar ?
	158	V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE :
	159	V4L2_BUF_TYPE_VIDEO_CAPTURE))
3d15c764 VB	160	return -EINVAL;
	161
	162	parm->parm.capture.capability = V4L2_CAP_TIMEPERFRAME;
	163	parm->parm.capture.timeperframe = dev->timeperframe_tch_cap;
	164	parm->parm.capture.readbuffers = 1;
	165	return 0;
	166	}
	167
	168	int vivid_enum_input_tch(struct file file, void priv, struct v4l2_input *inp)
	169	{
	170	if (inp->index)
	171	return -EINVAL;
	172
	173	inp->type = V4L2_INPUT_TYPE_TOUCH;
	174	strscpy(inp->name, "Vivid Touch", sizeof(inp->name));
	175	inp->capabilities = 0;
	176	return 0;
	177	}
	178
	179	int vivid_g_input_tch(struct file file, void priv, unsigned int *i)
	180	{
	181	*i = 0;
	182	return 0;
	183	}
	184
	185	int vivid_set_touch(struct vivid_dev *dev, unsigned int i)
	186	{
	187	struct v4l2_pix_format *f = &dev->tch_format;
	188
	189	if (i)
	190	return -EINVAL;
	191
	192	f->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
	193	f->width = VIVID_TCH_WIDTH;
	194	f->height = VIVID_TCH_HEIGHT;
	195	f->field = V4L2_FIELD_NONE;
	196	f->colorspace = V4L2_COLORSPACE_RAW;
	197	f->bytesperline = f->width * sizeof(s16);
	198	f->sizeimage = f->width * f->height * sizeof(s16);
	199	return 0;
	200	}
	201
	202	int vivid_s_input_tch(struct file file, void priv, unsigned int i)
	203	{
	204	return vivid_set_touch(video_drvdata(file), i);
	205	}
	206
	207	static void vivid_fill_buff_noise(__s16 *tch_buf, int size)
	208	{
	209	int i;
	210
	211	/* Fill 10% of the values within range -3 and 3, zero the others */
	212	for (i = 0; i < size; i++) {
a251c17a	213	unsigned int rand = get_random_u32();
3d15c764 VB	214
	215	if (rand % 10)
	216	tch_buf[i] = 0;
	217	else
	218	tch_buf[i] = (rand / 10) % 7 - 3;
	219	}
	220	}
	221
	222	static inline int get_random_pressure(void)
	223	{
81895a65	224	return prandom_u32_max(VIVID_PRESSURE_LIMIT);
3d15c764 VB	225	}
	226
	227	static void vivid_tch_buf_set(struct v4l2_pix_format *f,
	228	__s16 *tch_buf,
	229	int index)
	230	{
	231	unsigned int x = index % f->width;
	232	unsigned int y = index / f->width;
	233	unsigned int offset = VIVID_MIN_PRESSURE;
	234
	235	tch_buf[index] = offset + get_random_pressure();
	236	offset /= 2;
	237	if (x)
	238	tch_buf[index - 1] = offset + get_random_pressure();
	239	if (x < f->width - 1)
	240	tch_buf[index + 1] = offset + get_random_pressure();
	241	if (y)
	242	tch_buf[index - f->width] = offset + get_random_pressure();
	243	if (y < f->height - 1)
	244	tch_buf[index + f->width] = offset + get_random_pressure();
	245	offset /= 2;
	246	if (x && y)
	247	tch_buf[index - 1 - f->width] = offset + get_random_pressure();
	248	if (x < f->width - 1 && y)
	249	tch_buf[index + 1 - f->width] = offset + get_random_pressure();
	250	if (x && y < f->height - 1)
	251	tch_buf[index - 1 + f->width] = offset + get_random_pressure();
	252	if (x < f->width - 1 && y < f->height - 1)
	253	tch_buf[index + 1 + f->width] = offset + get_random_pressure();
	254	}
	255
	256	void vivid_fillbuff_tch(struct vivid_dev dev, struct vivid_buffer buf)
	257	{
	258	struct v4l2_pix_format *f = &dev->tch_format;
	259	int size = f->width * f->height;
	260	int x, y, xstart, ystart, offset_x, offset_y;
	261	unsigned int test_pattern, test_pat_idx, rand;
	262
	263	__s16 *tch_buf = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
	264
57c1d5de	265	buf->vb.sequence = dev->touch_cap_with_seq_wrap_count;
3d15c764 VB	266	test_pattern = (buf->vb.sequence / TCH_SEQ_COUNT) % TEST_CASE_MAX;
	267	test_pat_idx = buf->vb.sequence % TCH_SEQ_COUNT;
	268
	269	vivid_fill_buff_noise(tch_buf, size);
	270
	271	if (test_pat_idx >= TCH_PATTERN_COUNT)
	272	return;
	273
	274	if (test_pat_idx == 0)
a251c17a	275	dev->tch_pat_random = get_random_u32();
3d15c764 VB	276	rand = dev->tch_pat_random;
	277
	278	switch (test_pattern) {
	279	case SINGLE_TAP:
	280	if (test_pat_idx == 2)
	281	vivid_tch_buf_set(f, tch_buf, rand % size);
	282	break;
	283	case DOUBLE_TAP:
	284	if (test_pat_idx == 2 \|\| test_pat_idx == 4)
	285	vivid_tch_buf_set(f, tch_buf, rand % size);
	286	break;
	287	case TRIPLE_TAP:
	288	if (test_pat_idx == 2 \|\| test_pat_idx == 4 \|\| test_pat_idx == 6)
	289	vivid_tch_buf_set(f, tch_buf, rand % size);
	290	break;
	291	case MOVE_LEFT_TO_RIGHT:
	292	vivid_tch_buf_set(f, tch_buf,
	293	(rand % f->height) * f->width +
	294	test_pat_idx *
	295	(f->width / TCH_PATTERN_COUNT));
	296	break;
	297	case ZOOM_IN:
	298	x = f->width / 2;
	299	y = f->height / 2;
	300	offset_x = ((TCH_PATTERN_COUNT - 1 - test_pat_idx) * x) /
	301	TCH_PATTERN_COUNT;
	302	offset_y = ((TCH_PATTERN_COUNT - 1 - test_pat_idx) * y) /
	303	TCH_PATTERN_COUNT;
	304	vivid_tch_buf_set(f, tch_buf,
	305	(x - offset_x) + f->width * (y - offset_y));
	306	vivid_tch_buf_set(f, tch_buf,
	307	(x + offset_x) + f->width * (y + offset_y));
	308	break;
	309	case ZOOM_OUT:
	310	x = f->width / 2;
	311	y = f->height / 2;
	312	offset_x = (test_pat_idx * x) / TCH_PATTERN_COUNT;
	313	offset_y = (test_pat_idx * y) / TCH_PATTERN_COUNT;
	314	vivid_tch_buf_set(f, tch_buf,
	315	(x - offset_x) + f->width * (y - offset_y));
	316	vivid_tch_buf_set(f, tch_buf,
	317	(x + offset_x) + f->width * (y + offset_y));
	318	break;
	319	case PALM_PRESS:
	320	for (x = 0; x < f->width; x++)
	321	for (y = f->height / 2; y < f->height; y++)
	322	tch_buf[x + f->width * y] = VIVID_MIN_PRESSURE +
	323	get_random_pressure();
	324	break;
	325	case MULTIPLE_PRESS:
	326	/* 16 pressure points */
	327	for (y = 0; y < 4; y++) {
	328	for (x = 0; x < 4; x++) {
	329	ystart = (y * f->height) / 4 + f->height / 8;
	330	xstart = (x * f->width) / 4 + f->width / 8;
	331	vivid_tch_buf_set(f, tch_buf,
	332	ystart * f->width + xstart);
	333	}
	334	}
	335	break;
	336	}
	337	#ifdef __BIG_ENDIAN__
	338	for (x = 0; x < size; x++)
	339	tch_buf[x] = (__force s16)__cpu_to_le16((u16)tch_buf[x]);
340	#endif
341	}