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"
8 #include "vivid-vid-common.h"
9 #include "vivid-touch-cap.h"
10 
touch_cap_queue_setup(struct vb2_queue * vq,unsigned int * nbuffers,unsigned int * nplanes,unsigned int sizes[],struct device * alloc_devs[])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 
touch_cap_buf_prepare(struct vb2_buffer * vb)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 
touch_cap_buf_queue(struct vb2_buffer * vb)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 
63 	vbuf->field = V4L2_FIELD_NONE;
64 	spin_lock(&dev->slock);
65 	list_add_tail(&buf->list, &dev->touch_cap_active);
66 	spin_unlock(&dev->slock);
67 }
68 
touch_cap_start_streaming(struct vb2_queue * vq,unsigned int count)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 */
touch_cap_stop_streaming(struct vb2_queue * vq)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 
touch_cap_buf_request_complete(struct vb2_buffer * vb)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 
vivid_enum_fmt_tch(struct file * file,void * priv,struct v4l2_fmtdesc * f)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 
vivid_g_fmt_tch(struct file * file,void * priv,struct v4l2_format * f)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 
133 	if (dev->multiplanar)
134 		return -ENOTTY;
135 	f->fmt.pix = dev->tch_format;
136 	return 0;
137 }
138 
vivid_g_fmt_tch_mplane(struct file * file,void * priv,struct v4l2_format * f)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 
vivid_g_parm_tch(struct file * file,void * priv,struct v4l2_streamparm * parm)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 
157 	if (parm->type != (dev->multiplanar ?
158 			   V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE :
159 			   V4L2_BUF_TYPE_VIDEO_CAPTURE))
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 
vivid_enum_input_tch(struct file * file,void * priv,struct v4l2_input * inp)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 
vivid_g_input_tch(struct file * file,void * priv,unsigned int * i)179 int vivid_g_input_tch(struct file *file, void *priv, unsigned int *i)
180 {
181 	*i = 0;
182 	return 0;
183 }
184 
vivid_set_touch(struct vivid_dev * dev,unsigned int i)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 
vivid_s_input_tch(struct file * file,void * priv,unsigned int i)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 
vivid_fill_buff_noise(__s16 * tch_buf,int size)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++) {
213 		unsigned int rand = get_random_u32();
214 
215 		if (rand % 10)
216 			tch_buf[i] = 0;
217 		else
218 			tch_buf[i] = (rand / 10) % 7 - 3;
219 	}
220 }
221 
get_random_pressure(void)222 static inline int get_random_pressure(void)
223 {
224 	return prandom_u32_max(VIVID_PRESSURE_LIMIT);
225 }
226 
vivid_tch_buf_set(struct v4l2_pix_format * f,__s16 * tch_buf,int index)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 
vivid_fillbuff_tch(struct vivid_dev * dev,struct vivid_buffer * buf)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 
265 	buf->vb.sequence = dev->touch_cap_with_seq_wrap_count;
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)
275 		dev->tch_pat_random = get_random_u32();
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 }
342