1 /*
2  * Video capture interface for Linux version 2
3  *
4  * A generic framework to process V4L2 ioctl commands.
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  *
11  * Authors:	Alan Cox, <alan@lxorguk.ukuu.org.uk> (version 1)
12  *              Mauro Carvalho Chehab <mchehab@infradead.org> (version 2)
13  */
14 
15 #include <linux/module.h>
16 #include <linux/slab.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/version.h>
20 
21 #include <linux/videodev2.h>
22 
23 #include <media/v4l2-common.h>
24 #include <media/v4l2-ioctl.h>
25 #include <media/v4l2-ctrls.h>
26 #include <media/v4l2-fh.h>
27 #include <media/v4l2-event.h>
28 #include <media/v4l2-device.h>
29 #include <media/videobuf2-v4l2.h>
30 
31 #include <trace/events/v4l2.h>
32 
33 /* Zero out the end of the struct pointed to by p.  Everything after, but
34  * not including, the specified field is cleared. */
35 #define CLEAR_AFTER_FIELD(p, field) \
36 	memset((u8 *)(p) + offsetof(typeof(*(p)), field) + sizeof((p)->field), \
37 	0, sizeof(*(p)) - offsetof(typeof(*(p)), field) - sizeof((p)->field))
38 
39 #define is_valid_ioctl(vfd, cmd) test_bit(_IOC_NR(cmd), (vfd)->valid_ioctls)
40 
41 struct std_descr {
42 	v4l2_std_id std;
43 	const char *descr;
44 };
45 
46 static const struct std_descr standards[] = {
47 	{ V4L2_STD_NTSC, 	"NTSC"      },
48 	{ V4L2_STD_NTSC_M, 	"NTSC-M"    },
49 	{ V4L2_STD_NTSC_M_JP, 	"NTSC-M-JP" },
50 	{ V4L2_STD_NTSC_M_KR,	"NTSC-M-KR" },
51 	{ V4L2_STD_NTSC_443, 	"NTSC-443"  },
52 	{ V4L2_STD_PAL, 	"PAL"       },
53 	{ V4L2_STD_PAL_BG, 	"PAL-BG"    },
54 	{ V4L2_STD_PAL_B, 	"PAL-B"     },
55 	{ V4L2_STD_PAL_B1, 	"PAL-B1"    },
56 	{ V4L2_STD_PAL_G, 	"PAL-G"     },
57 	{ V4L2_STD_PAL_H, 	"PAL-H"     },
58 	{ V4L2_STD_PAL_I, 	"PAL-I"     },
59 	{ V4L2_STD_PAL_DK, 	"PAL-DK"    },
60 	{ V4L2_STD_PAL_D, 	"PAL-D"     },
61 	{ V4L2_STD_PAL_D1, 	"PAL-D1"    },
62 	{ V4L2_STD_PAL_K, 	"PAL-K"     },
63 	{ V4L2_STD_PAL_M, 	"PAL-M"     },
64 	{ V4L2_STD_PAL_N, 	"PAL-N"     },
65 	{ V4L2_STD_PAL_Nc, 	"PAL-Nc"    },
66 	{ V4L2_STD_PAL_60, 	"PAL-60"    },
67 	{ V4L2_STD_SECAM, 	"SECAM"     },
68 	{ V4L2_STD_SECAM_B, 	"SECAM-B"   },
69 	{ V4L2_STD_SECAM_G, 	"SECAM-G"   },
70 	{ V4L2_STD_SECAM_H, 	"SECAM-H"   },
71 	{ V4L2_STD_SECAM_DK, 	"SECAM-DK"  },
72 	{ V4L2_STD_SECAM_D, 	"SECAM-D"   },
73 	{ V4L2_STD_SECAM_K, 	"SECAM-K"   },
74 	{ V4L2_STD_SECAM_K1, 	"SECAM-K1"  },
75 	{ V4L2_STD_SECAM_L, 	"SECAM-L"   },
76 	{ V4L2_STD_SECAM_LC, 	"SECAM-Lc"  },
77 	{ 0, 			"Unknown"   }
78 };
79 
80 /* video4linux standard ID conversion to standard name
81  */
82 const char *v4l2_norm_to_name(v4l2_std_id id)
83 {
84 	u32 myid = id;
85 	int i;
86 
87 	/* HACK: ppc32 architecture doesn't have __ucmpdi2 function to handle
88 	   64 bit comparations. So, on that architecture, with some gcc
89 	   variants, compilation fails. Currently, the max value is 30bit wide.
90 	 */
91 	BUG_ON(myid != id);
92 
93 	for (i = 0; standards[i].std; i++)
94 		if (myid == standards[i].std)
95 			break;
96 	return standards[i].descr;
97 }
98 EXPORT_SYMBOL(v4l2_norm_to_name);
99 
100 /* Returns frame period for the given standard */
101 void v4l2_video_std_frame_period(int id, struct v4l2_fract *frameperiod)
102 {
103 	if (id & V4L2_STD_525_60) {
104 		frameperiod->numerator = 1001;
105 		frameperiod->denominator = 30000;
106 	} else {
107 		frameperiod->numerator = 1;
108 		frameperiod->denominator = 25;
109 	}
110 }
111 EXPORT_SYMBOL(v4l2_video_std_frame_period);
112 
113 /* Fill in the fields of a v4l2_standard structure according to the
114    'id' and 'transmission' parameters.  Returns negative on error.  */
115 int v4l2_video_std_construct(struct v4l2_standard *vs,
116 			     int id, const char *name)
117 {
118 	vs->id = id;
119 	v4l2_video_std_frame_period(id, &vs->frameperiod);
120 	vs->framelines = (id & V4L2_STD_525_60) ? 525 : 625;
121 	strlcpy(vs->name, name, sizeof(vs->name));
122 	return 0;
123 }
124 EXPORT_SYMBOL(v4l2_video_std_construct);
125 
126 /* ----------------------------------------------------------------- */
127 /* some arrays for pretty-printing debug messages of enum types      */
128 
129 const char *v4l2_field_names[] = {
130 	[V4L2_FIELD_ANY]        = "any",
131 	[V4L2_FIELD_NONE]       = "none",
132 	[V4L2_FIELD_TOP]        = "top",
133 	[V4L2_FIELD_BOTTOM]     = "bottom",
134 	[V4L2_FIELD_INTERLACED] = "interlaced",
135 	[V4L2_FIELD_SEQ_TB]     = "seq-tb",
136 	[V4L2_FIELD_SEQ_BT]     = "seq-bt",
137 	[V4L2_FIELD_ALTERNATE]  = "alternate",
138 	[V4L2_FIELD_INTERLACED_TB] = "interlaced-tb",
139 	[V4L2_FIELD_INTERLACED_BT] = "interlaced-bt",
140 };
141 EXPORT_SYMBOL(v4l2_field_names);
142 
143 const char *v4l2_type_names[] = {
144 	[0]				   = "0",
145 	[V4L2_BUF_TYPE_VIDEO_CAPTURE]      = "vid-cap",
146 	[V4L2_BUF_TYPE_VIDEO_OVERLAY]      = "vid-overlay",
147 	[V4L2_BUF_TYPE_VIDEO_OUTPUT]       = "vid-out",
148 	[V4L2_BUF_TYPE_VBI_CAPTURE]        = "vbi-cap",
149 	[V4L2_BUF_TYPE_VBI_OUTPUT]         = "vbi-out",
150 	[V4L2_BUF_TYPE_SLICED_VBI_CAPTURE] = "sliced-vbi-cap",
151 	[V4L2_BUF_TYPE_SLICED_VBI_OUTPUT]  = "sliced-vbi-out",
152 	[V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY] = "vid-out-overlay",
153 	[V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE] = "vid-cap-mplane",
154 	[V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE] = "vid-out-mplane",
155 	[V4L2_BUF_TYPE_SDR_CAPTURE]        = "sdr-cap",
156 	[V4L2_BUF_TYPE_SDR_OUTPUT]         = "sdr-out",
157 };
158 EXPORT_SYMBOL(v4l2_type_names);
159 
160 static const char *v4l2_memory_names[] = {
161 	[V4L2_MEMORY_MMAP]    = "mmap",
162 	[V4L2_MEMORY_USERPTR] = "userptr",
163 	[V4L2_MEMORY_OVERLAY] = "overlay",
164 	[V4L2_MEMORY_DMABUF] = "dmabuf",
165 };
166 
167 #define prt_names(a, arr) (((unsigned)(a)) < ARRAY_SIZE(arr) ? arr[a] : "unknown")
168 
169 /* ------------------------------------------------------------------ */
170 /* debug help functions                                               */
171 
172 static void v4l_print_querycap(const void *arg, bool write_only)
173 {
174 	const struct v4l2_capability *p = arg;
175 
176 	pr_cont("driver=%.*s, card=%.*s, bus=%.*s, version=0x%08x, "
177 		"capabilities=0x%08x, device_caps=0x%08x\n",
178 		(int)sizeof(p->driver), p->driver,
179 		(int)sizeof(p->card), p->card,
180 		(int)sizeof(p->bus_info), p->bus_info,
181 		p->version, p->capabilities, p->device_caps);
182 }
183 
184 static void v4l_print_enuminput(const void *arg, bool write_only)
185 {
186 	const struct v4l2_input *p = arg;
187 
188 	pr_cont("index=%u, name=%.*s, type=%u, audioset=0x%x, tuner=%u, "
189 		"std=0x%08Lx, status=0x%x, capabilities=0x%x\n",
190 		p->index, (int)sizeof(p->name), p->name, p->type, p->audioset,
191 		p->tuner, (unsigned long long)p->std, p->status,
192 		p->capabilities);
193 }
194 
195 static void v4l_print_enumoutput(const void *arg, bool write_only)
196 {
197 	const struct v4l2_output *p = arg;
198 
199 	pr_cont("index=%u, name=%.*s, type=%u, audioset=0x%x, "
200 		"modulator=%u, std=0x%08Lx, capabilities=0x%x\n",
201 		p->index, (int)sizeof(p->name), p->name, p->type, p->audioset,
202 		p->modulator, (unsigned long long)p->std, p->capabilities);
203 }
204 
205 static void v4l_print_audio(const void *arg, bool write_only)
206 {
207 	const struct v4l2_audio *p = arg;
208 
209 	if (write_only)
210 		pr_cont("index=%u, mode=0x%x\n", p->index, p->mode);
211 	else
212 		pr_cont("index=%u, name=%.*s, capability=0x%x, mode=0x%x\n",
213 			p->index, (int)sizeof(p->name), p->name,
214 			p->capability, p->mode);
215 }
216 
217 static void v4l_print_audioout(const void *arg, bool write_only)
218 {
219 	const struct v4l2_audioout *p = arg;
220 
221 	if (write_only)
222 		pr_cont("index=%u\n", p->index);
223 	else
224 		pr_cont("index=%u, name=%.*s, capability=0x%x, mode=0x%x\n",
225 			p->index, (int)sizeof(p->name), p->name,
226 			p->capability, p->mode);
227 }
228 
229 static void v4l_print_fmtdesc(const void *arg, bool write_only)
230 {
231 	const struct v4l2_fmtdesc *p = arg;
232 
233 	pr_cont("index=%u, type=%s, flags=0x%x, pixelformat=%c%c%c%c, description='%.*s'\n",
234 		p->index, prt_names(p->type, v4l2_type_names),
235 		p->flags, (p->pixelformat & 0xff),
236 		(p->pixelformat >>  8) & 0xff,
237 		(p->pixelformat >> 16) & 0xff,
238 		(p->pixelformat >> 24) & 0xff,
239 		(int)sizeof(p->description), p->description);
240 }
241 
242 static void v4l_print_format(const void *arg, bool write_only)
243 {
244 	const struct v4l2_format *p = arg;
245 	const struct v4l2_pix_format *pix;
246 	const struct v4l2_pix_format_mplane *mp;
247 	const struct v4l2_vbi_format *vbi;
248 	const struct v4l2_sliced_vbi_format *sliced;
249 	const struct v4l2_window *win;
250 	const struct v4l2_sdr_format *sdr;
251 	unsigned i;
252 
253 	pr_cont("type=%s", prt_names(p->type, v4l2_type_names));
254 	switch (p->type) {
255 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
256 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
257 		pix = &p->fmt.pix;
258 		pr_cont(", width=%u, height=%u, "
259 			"pixelformat=%c%c%c%c, field=%s, "
260 			"bytesperline=%u, sizeimage=%u, colorspace=%d, "
261 			"flags=0x%x, ycbcr_enc=%u, quantization=%u, "
262 			"xfer_func=%u\n",
263 			pix->width, pix->height,
264 			(pix->pixelformat & 0xff),
265 			(pix->pixelformat >>  8) & 0xff,
266 			(pix->pixelformat >> 16) & 0xff,
267 			(pix->pixelformat >> 24) & 0xff,
268 			prt_names(pix->field, v4l2_field_names),
269 			pix->bytesperline, pix->sizeimage,
270 			pix->colorspace, pix->flags, pix->ycbcr_enc,
271 			pix->quantization, pix->xfer_func);
272 		break;
273 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
274 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
275 		mp = &p->fmt.pix_mp;
276 		pr_cont(", width=%u, height=%u, "
277 			"format=%c%c%c%c, field=%s, "
278 			"colorspace=%d, num_planes=%u, flags=0x%x, "
279 			"ycbcr_enc=%u, quantization=%u, xfer_func=%u\n",
280 			mp->width, mp->height,
281 			(mp->pixelformat & 0xff),
282 			(mp->pixelformat >>  8) & 0xff,
283 			(mp->pixelformat >> 16) & 0xff,
284 			(mp->pixelformat >> 24) & 0xff,
285 			prt_names(mp->field, v4l2_field_names),
286 			mp->colorspace, mp->num_planes, mp->flags,
287 			mp->ycbcr_enc, mp->quantization, mp->xfer_func);
288 		for (i = 0; i < mp->num_planes; i++)
289 			printk(KERN_DEBUG "plane %u: bytesperline=%u sizeimage=%u\n", i,
290 					mp->plane_fmt[i].bytesperline,
291 					mp->plane_fmt[i].sizeimage);
292 		break;
293 	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
294 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
295 		win = &p->fmt.win;
296 		/* Note: we can't print the clip list here since the clips
297 		 * pointer is a userspace pointer, not a kernelspace
298 		 * pointer. */
299 		pr_cont(", wxh=%dx%d, x,y=%d,%d, field=%s, chromakey=0x%08x, clipcount=%u, clips=%p, bitmap=%p, global_alpha=0x%02x\n",
300 			win->w.width, win->w.height, win->w.left, win->w.top,
301 			prt_names(win->field, v4l2_field_names),
302 			win->chromakey, win->clipcount, win->clips,
303 			win->bitmap, win->global_alpha);
304 		break;
305 	case V4L2_BUF_TYPE_VBI_CAPTURE:
306 	case V4L2_BUF_TYPE_VBI_OUTPUT:
307 		vbi = &p->fmt.vbi;
308 		pr_cont(", sampling_rate=%u, offset=%u, samples_per_line=%u, "
309 			"sample_format=%c%c%c%c, start=%u,%u, count=%u,%u\n",
310 			vbi->sampling_rate, vbi->offset,
311 			vbi->samples_per_line,
312 			(vbi->sample_format & 0xff),
313 			(vbi->sample_format >>  8) & 0xff,
314 			(vbi->sample_format >> 16) & 0xff,
315 			(vbi->sample_format >> 24) & 0xff,
316 			vbi->start[0], vbi->start[1],
317 			vbi->count[0], vbi->count[1]);
318 		break;
319 	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
320 	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
321 		sliced = &p->fmt.sliced;
322 		pr_cont(", service_set=0x%08x, io_size=%d\n",
323 				sliced->service_set, sliced->io_size);
324 		for (i = 0; i < 24; i++)
325 			printk(KERN_DEBUG "line[%02u]=0x%04x, 0x%04x\n", i,
326 				sliced->service_lines[0][i],
327 				sliced->service_lines[1][i]);
328 		break;
329 	case V4L2_BUF_TYPE_SDR_CAPTURE:
330 	case V4L2_BUF_TYPE_SDR_OUTPUT:
331 		sdr = &p->fmt.sdr;
332 		pr_cont(", pixelformat=%c%c%c%c\n",
333 			(sdr->pixelformat >>  0) & 0xff,
334 			(sdr->pixelformat >>  8) & 0xff,
335 			(sdr->pixelformat >> 16) & 0xff,
336 			(sdr->pixelformat >> 24) & 0xff);
337 		break;
338 	}
339 }
340 
341 static void v4l_print_framebuffer(const void *arg, bool write_only)
342 {
343 	const struct v4l2_framebuffer *p = arg;
344 
345 	pr_cont("capability=0x%x, flags=0x%x, base=0x%p, width=%u, "
346 		"height=%u, pixelformat=%c%c%c%c, "
347 		"bytesperline=%u, sizeimage=%u, colorspace=%d\n",
348 			p->capability, p->flags, p->base,
349 			p->fmt.width, p->fmt.height,
350 			(p->fmt.pixelformat & 0xff),
351 			(p->fmt.pixelformat >>  8) & 0xff,
352 			(p->fmt.pixelformat >> 16) & 0xff,
353 			(p->fmt.pixelformat >> 24) & 0xff,
354 			p->fmt.bytesperline, p->fmt.sizeimage,
355 			p->fmt.colorspace);
356 }
357 
358 static void v4l_print_buftype(const void *arg, bool write_only)
359 {
360 	pr_cont("type=%s\n", prt_names(*(u32 *)arg, v4l2_type_names));
361 }
362 
363 static void v4l_print_modulator(const void *arg, bool write_only)
364 {
365 	const struct v4l2_modulator *p = arg;
366 
367 	if (write_only)
368 		pr_cont("index=%u, txsubchans=0x%x\n", p->index, p->txsubchans);
369 	else
370 		pr_cont("index=%u, name=%.*s, capability=0x%x, "
371 			"rangelow=%u, rangehigh=%u, txsubchans=0x%x\n",
372 			p->index, (int)sizeof(p->name), p->name, p->capability,
373 			p->rangelow, p->rangehigh, p->txsubchans);
374 }
375 
376 static void v4l_print_tuner(const void *arg, bool write_only)
377 {
378 	const struct v4l2_tuner *p = arg;
379 
380 	if (write_only)
381 		pr_cont("index=%u, audmode=%u\n", p->index, p->audmode);
382 	else
383 		pr_cont("index=%u, name=%.*s, type=%u, capability=0x%x, "
384 			"rangelow=%u, rangehigh=%u, signal=%u, afc=%d, "
385 			"rxsubchans=0x%x, audmode=%u\n",
386 			p->index, (int)sizeof(p->name), p->name, p->type,
387 			p->capability, p->rangelow,
388 			p->rangehigh, p->signal, p->afc,
389 			p->rxsubchans, p->audmode);
390 }
391 
392 static void v4l_print_frequency(const void *arg, bool write_only)
393 {
394 	const struct v4l2_frequency *p = arg;
395 
396 	pr_cont("tuner=%u, type=%u, frequency=%u\n",
397 				p->tuner, p->type, p->frequency);
398 }
399 
400 static void v4l_print_standard(const void *arg, bool write_only)
401 {
402 	const struct v4l2_standard *p = arg;
403 
404 	pr_cont("index=%u, id=0x%Lx, name=%.*s, fps=%u/%u, "
405 		"framelines=%u\n", p->index,
406 		(unsigned long long)p->id, (int)sizeof(p->name), p->name,
407 		p->frameperiod.numerator,
408 		p->frameperiod.denominator,
409 		p->framelines);
410 }
411 
412 static void v4l_print_std(const void *arg, bool write_only)
413 {
414 	pr_cont("std=0x%08Lx\n", *(const long long unsigned *)arg);
415 }
416 
417 static void v4l_print_hw_freq_seek(const void *arg, bool write_only)
418 {
419 	const struct v4l2_hw_freq_seek *p = arg;
420 
421 	pr_cont("tuner=%u, type=%u, seek_upward=%u, wrap_around=%u, spacing=%u, "
422 		"rangelow=%u, rangehigh=%u\n",
423 		p->tuner, p->type, p->seek_upward, p->wrap_around, p->spacing,
424 		p->rangelow, p->rangehigh);
425 }
426 
427 static void v4l_print_requestbuffers(const void *arg, bool write_only)
428 {
429 	const struct v4l2_requestbuffers *p = arg;
430 
431 	pr_cont("count=%d, type=%s, memory=%s\n",
432 		p->count,
433 		prt_names(p->type, v4l2_type_names),
434 		prt_names(p->memory, v4l2_memory_names));
435 }
436 
437 static void v4l_print_buffer(const void *arg, bool write_only)
438 {
439 	const struct v4l2_buffer *p = arg;
440 	const struct v4l2_timecode *tc = &p->timecode;
441 	const struct v4l2_plane *plane;
442 	int i;
443 
444 	pr_cont("%02ld:%02d:%02d.%08ld index=%d, type=%s, "
445 		"flags=0x%08x, field=%s, sequence=%d, memory=%s",
446 			p->timestamp.tv_sec / 3600,
447 			(int)(p->timestamp.tv_sec / 60) % 60,
448 			(int)(p->timestamp.tv_sec % 60),
449 			(long)p->timestamp.tv_usec,
450 			p->index,
451 			prt_names(p->type, v4l2_type_names),
452 			p->flags, prt_names(p->field, v4l2_field_names),
453 			p->sequence, prt_names(p->memory, v4l2_memory_names));
454 
455 	if (V4L2_TYPE_IS_MULTIPLANAR(p->type) && p->m.planes) {
456 		pr_cont("\n");
457 		for (i = 0; i < p->length; ++i) {
458 			plane = &p->m.planes[i];
459 			printk(KERN_DEBUG
460 				"plane %d: bytesused=%d, data_offset=0x%08x, "
461 				"offset/userptr=0x%lx, length=%d\n",
462 				i, plane->bytesused, plane->data_offset,
463 				plane->m.userptr, plane->length);
464 		}
465 	} else {
466 		pr_cont(", bytesused=%d, offset/userptr=0x%lx, length=%d\n",
467 			p->bytesused, p->m.userptr, p->length);
468 	}
469 
470 	printk(KERN_DEBUG "timecode=%02d:%02d:%02d type=%d, "
471 		"flags=0x%08x, frames=%d, userbits=0x%08x\n",
472 			tc->hours, tc->minutes, tc->seconds,
473 			tc->type, tc->flags, tc->frames, *(__u32 *)tc->userbits);
474 }
475 
476 static void v4l_print_exportbuffer(const void *arg, bool write_only)
477 {
478 	const struct v4l2_exportbuffer *p = arg;
479 
480 	pr_cont("fd=%d, type=%s, index=%u, plane=%u, flags=0x%08x\n",
481 		p->fd, prt_names(p->type, v4l2_type_names),
482 		p->index, p->plane, p->flags);
483 }
484 
485 static void v4l_print_create_buffers(const void *arg, bool write_only)
486 {
487 	const struct v4l2_create_buffers *p = arg;
488 
489 	pr_cont("index=%d, count=%d, memory=%s, ",
490 			p->index, p->count,
491 			prt_names(p->memory, v4l2_memory_names));
492 	v4l_print_format(&p->format, write_only);
493 }
494 
495 static void v4l_print_streamparm(const void *arg, bool write_only)
496 {
497 	const struct v4l2_streamparm *p = arg;
498 
499 	pr_cont("type=%s", prt_names(p->type, v4l2_type_names));
500 
501 	if (p->type == V4L2_BUF_TYPE_VIDEO_CAPTURE ||
502 	    p->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
503 		const struct v4l2_captureparm *c = &p->parm.capture;
504 
505 		pr_cont(", capability=0x%x, capturemode=0x%x, timeperframe=%d/%d, "
506 			"extendedmode=%d, readbuffers=%d\n",
507 			c->capability, c->capturemode,
508 			c->timeperframe.numerator, c->timeperframe.denominator,
509 			c->extendedmode, c->readbuffers);
510 	} else if (p->type == V4L2_BUF_TYPE_VIDEO_OUTPUT ||
511 		   p->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
512 		const struct v4l2_outputparm *c = &p->parm.output;
513 
514 		pr_cont(", capability=0x%x, outputmode=0x%x, timeperframe=%d/%d, "
515 			"extendedmode=%d, writebuffers=%d\n",
516 			c->capability, c->outputmode,
517 			c->timeperframe.numerator, c->timeperframe.denominator,
518 			c->extendedmode, c->writebuffers);
519 	} else {
520 		pr_cont("\n");
521 	}
522 }
523 
524 static void v4l_print_queryctrl(const void *arg, bool write_only)
525 {
526 	const struct v4l2_queryctrl *p = arg;
527 
528 	pr_cont("id=0x%x, type=%d, name=%.*s, min/max=%d/%d, "
529 		"step=%d, default=%d, flags=0x%08x\n",
530 			p->id, p->type, (int)sizeof(p->name), p->name,
531 			p->minimum, p->maximum,
532 			p->step, p->default_value, p->flags);
533 }
534 
535 static void v4l_print_query_ext_ctrl(const void *arg, bool write_only)
536 {
537 	const struct v4l2_query_ext_ctrl *p = arg;
538 
539 	pr_cont("id=0x%x, type=%d, name=%.*s, min/max=%lld/%lld, "
540 		"step=%lld, default=%lld, flags=0x%08x, elem_size=%u, elems=%u, "
541 		"nr_of_dims=%u, dims=%u,%u,%u,%u\n",
542 			p->id, p->type, (int)sizeof(p->name), p->name,
543 			p->minimum, p->maximum,
544 			p->step, p->default_value, p->flags,
545 			p->elem_size, p->elems, p->nr_of_dims,
546 			p->dims[0], p->dims[1], p->dims[2], p->dims[3]);
547 }
548 
549 static void v4l_print_querymenu(const void *arg, bool write_only)
550 {
551 	const struct v4l2_querymenu *p = arg;
552 
553 	pr_cont("id=0x%x, index=%d\n", p->id, p->index);
554 }
555 
556 static void v4l_print_control(const void *arg, bool write_only)
557 {
558 	const struct v4l2_control *p = arg;
559 
560 	pr_cont("id=0x%x, value=%d\n", p->id, p->value);
561 }
562 
563 static void v4l_print_ext_controls(const void *arg, bool write_only)
564 {
565 	const struct v4l2_ext_controls *p = arg;
566 	int i;
567 
568 	pr_cont("class=0x%x, count=%d, error_idx=%d",
569 			p->ctrl_class, p->count, p->error_idx);
570 	for (i = 0; i < p->count; i++) {
571 		if (!p->controls[i].size)
572 			pr_cont(", id/val=0x%x/0x%x",
573 				p->controls[i].id, p->controls[i].value);
574 		else
575 			pr_cont(", id/size=0x%x/%u",
576 				p->controls[i].id, p->controls[i].size);
577 	}
578 	pr_cont("\n");
579 }
580 
581 static void v4l_print_cropcap(const void *arg, bool write_only)
582 {
583 	const struct v4l2_cropcap *p = arg;
584 
585 	pr_cont("type=%s, bounds wxh=%dx%d, x,y=%d,%d, "
586 		"defrect wxh=%dx%d, x,y=%d,%d, "
587 		"pixelaspect %d/%d\n",
588 		prt_names(p->type, v4l2_type_names),
589 		p->bounds.width, p->bounds.height,
590 		p->bounds.left, p->bounds.top,
591 		p->defrect.width, p->defrect.height,
592 		p->defrect.left, p->defrect.top,
593 		p->pixelaspect.numerator, p->pixelaspect.denominator);
594 }
595 
596 static void v4l_print_crop(const void *arg, bool write_only)
597 {
598 	const struct v4l2_crop *p = arg;
599 
600 	pr_cont("type=%s, wxh=%dx%d, x,y=%d,%d\n",
601 		prt_names(p->type, v4l2_type_names),
602 		p->c.width, p->c.height,
603 		p->c.left, p->c.top);
604 }
605 
606 static void v4l_print_selection(const void *arg, bool write_only)
607 {
608 	const struct v4l2_selection *p = arg;
609 
610 	pr_cont("type=%s, target=%d, flags=0x%x, wxh=%dx%d, x,y=%d,%d\n",
611 		prt_names(p->type, v4l2_type_names),
612 		p->target, p->flags,
613 		p->r.width, p->r.height, p->r.left, p->r.top);
614 }
615 
616 static void v4l_print_jpegcompression(const void *arg, bool write_only)
617 {
618 	const struct v4l2_jpegcompression *p = arg;
619 
620 	pr_cont("quality=%d, APPn=%d, APP_len=%d, "
621 		"COM_len=%d, jpeg_markers=0x%x\n",
622 		p->quality, p->APPn, p->APP_len,
623 		p->COM_len, p->jpeg_markers);
624 }
625 
626 static void v4l_print_enc_idx(const void *arg, bool write_only)
627 {
628 	const struct v4l2_enc_idx *p = arg;
629 
630 	pr_cont("entries=%d, entries_cap=%d\n",
631 			p->entries, p->entries_cap);
632 }
633 
634 static void v4l_print_encoder_cmd(const void *arg, bool write_only)
635 {
636 	const struct v4l2_encoder_cmd *p = arg;
637 
638 	pr_cont("cmd=%d, flags=0x%x\n",
639 			p->cmd, p->flags);
640 }
641 
642 static void v4l_print_decoder_cmd(const void *arg, bool write_only)
643 {
644 	const struct v4l2_decoder_cmd *p = arg;
645 
646 	pr_cont("cmd=%d, flags=0x%x\n", p->cmd, p->flags);
647 
648 	if (p->cmd == V4L2_DEC_CMD_START)
649 		pr_info("speed=%d, format=%u\n",
650 				p->start.speed, p->start.format);
651 	else if (p->cmd == V4L2_DEC_CMD_STOP)
652 		pr_info("pts=%llu\n", p->stop.pts);
653 }
654 
655 static void v4l_print_dbg_chip_info(const void *arg, bool write_only)
656 {
657 	const struct v4l2_dbg_chip_info *p = arg;
658 
659 	pr_cont("type=%u, ", p->match.type);
660 	if (p->match.type == V4L2_CHIP_MATCH_I2C_DRIVER)
661 		pr_cont("name=%.*s, ",
662 				(int)sizeof(p->match.name), p->match.name);
663 	else
664 		pr_cont("addr=%u, ", p->match.addr);
665 	pr_cont("name=%.*s\n", (int)sizeof(p->name), p->name);
666 }
667 
668 static void v4l_print_dbg_register(const void *arg, bool write_only)
669 {
670 	const struct v4l2_dbg_register *p = arg;
671 
672 	pr_cont("type=%u, ", p->match.type);
673 	if (p->match.type == V4L2_CHIP_MATCH_I2C_DRIVER)
674 		pr_cont("name=%.*s, ",
675 				(int)sizeof(p->match.name), p->match.name);
676 	else
677 		pr_cont("addr=%u, ", p->match.addr);
678 	pr_cont("reg=0x%llx, val=0x%llx\n",
679 			p->reg, p->val);
680 }
681 
682 static void v4l_print_dv_timings(const void *arg, bool write_only)
683 {
684 	const struct v4l2_dv_timings *p = arg;
685 
686 	switch (p->type) {
687 	case V4L2_DV_BT_656_1120:
688 		pr_cont("type=bt-656/1120, interlaced=%u, "
689 			"pixelclock=%llu, "
690 			"width=%u, height=%u, polarities=0x%x, "
691 			"hfrontporch=%u, hsync=%u, "
692 			"hbackporch=%u, vfrontporch=%u, "
693 			"vsync=%u, vbackporch=%u, "
694 			"il_vfrontporch=%u, il_vsync=%u, "
695 			"il_vbackporch=%u, standards=0x%x, flags=0x%x\n",
696 				p->bt.interlaced, p->bt.pixelclock,
697 				p->bt.width, p->bt.height,
698 				p->bt.polarities, p->bt.hfrontporch,
699 				p->bt.hsync, p->bt.hbackporch,
700 				p->bt.vfrontporch, p->bt.vsync,
701 				p->bt.vbackporch, p->bt.il_vfrontporch,
702 				p->bt.il_vsync, p->bt.il_vbackporch,
703 				p->bt.standards, p->bt.flags);
704 		break;
705 	default:
706 		pr_cont("type=%d\n", p->type);
707 		break;
708 	}
709 }
710 
711 static void v4l_print_enum_dv_timings(const void *arg, bool write_only)
712 {
713 	const struct v4l2_enum_dv_timings *p = arg;
714 
715 	pr_cont("index=%u, ", p->index);
716 	v4l_print_dv_timings(&p->timings, write_only);
717 }
718 
719 static void v4l_print_dv_timings_cap(const void *arg, bool write_only)
720 {
721 	const struct v4l2_dv_timings_cap *p = arg;
722 
723 	switch (p->type) {
724 	case V4L2_DV_BT_656_1120:
725 		pr_cont("type=bt-656/1120, width=%u-%u, height=%u-%u, "
726 			"pixelclock=%llu-%llu, standards=0x%x, capabilities=0x%x\n",
727 			p->bt.min_width, p->bt.max_width,
728 			p->bt.min_height, p->bt.max_height,
729 			p->bt.min_pixelclock, p->bt.max_pixelclock,
730 			p->bt.standards, p->bt.capabilities);
731 		break;
732 	default:
733 		pr_cont("type=%u\n", p->type);
734 		break;
735 	}
736 }
737 
738 static void v4l_print_frmsizeenum(const void *arg, bool write_only)
739 {
740 	const struct v4l2_frmsizeenum *p = arg;
741 
742 	pr_cont("index=%u, pixelformat=%c%c%c%c, type=%u",
743 			p->index,
744 			(p->pixel_format & 0xff),
745 			(p->pixel_format >>  8) & 0xff,
746 			(p->pixel_format >> 16) & 0xff,
747 			(p->pixel_format >> 24) & 0xff,
748 			p->type);
749 	switch (p->type) {
750 	case V4L2_FRMSIZE_TYPE_DISCRETE:
751 		pr_cont(", wxh=%ux%u\n",
752 			p->discrete.width, p->discrete.height);
753 		break;
754 	case V4L2_FRMSIZE_TYPE_STEPWISE:
755 		pr_cont(", min=%ux%u, max=%ux%u, step=%ux%u\n",
756 				p->stepwise.min_width,  p->stepwise.min_height,
757 				p->stepwise.step_width, p->stepwise.step_height,
758 				p->stepwise.max_width,  p->stepwise.max_height);
759 		break;
760 	case V4L2_FRMSIZE_TYPE_CONTINUOUS:
761 		/* fall through */
762 	default:
763 		pr_cont("\n");
764 		break;
765 	}
766 }
767 
768 static void v4l_print_frmivalenum(const void *arg, bool write_only)
769 {
770 	const struct v4l2_frmivalenum *p = arg;
771 
772 	pr_cont("index=%u, pixelformat=%c%c%c%c, wxh=%ux%u, type=%u",
773 			p->index,
774 			(p->pixel_format & 0xff),
775 			(p->pixel_format >>  8) & 0xff,
776 			(p->pixel_format >> 16) & 0xff,
777 			(p->pixel_format >> 24) & 0xff,
778 			p->width, p->height, p->type);
779 	switch (p->type) {
780 	case V4L2_FRMIVAL_TYPE_DISCRETE:
781 		pr_cont(", fps=%d/%d\n",
782 				p->discrete.numerator,
783 				p->discrete.denominator);
784 		break;
785 	case V4L2_FRMIVAL_TYPE_STEPWISE:
786 		pr_cont(", min=%d/%d, max=%d/%d, step=%d/%d\n",
787 				p->stepwise.min.numerator,
788 				p->stepwise.min.denominator,
789 				p->stepwise.max.numerator,
790 				p->stepwise.max.denominator,
791 				p->stepwise.step.numerator,
792 				p->stepwise.step.denominator);
793 		break;
794 	case V4L2_FRMIVAL_TYPE_CONTINUOUS:
795 		/* fall through */
796 	default:
797 		pr_cont("\n");
798 		break;
799 	}
800 }
801 
802 static void v4l_print_event(const void *arg, bool write_only)
803 {
804 	const struct v4l2_event *p = arg;
805 	const struct v4l2_event_ctrl *c;
806 
807 	pr_cont("type=0x%x, pending=%u, sequence=%u, id=%u, "
808 		"timestamp=%lu.%9.9lu\n",
809 			p->type, p->pending, p->sequence, p->id,
810 			p->timestamp.tv_sec, p->timestamp.tv_nsec);
811 	switch (p->type) {
812 	case V4L2_EVENT_VSYNC:
813 		printk(KERN_DEBUG "field=%s\n",
814 			prt_names(p->u.vsync.field, v4l2_field_names));
815 		break;
816 	case V4L2_EVENT_CTRL:
817 		c = &p->u.ctrl;
818 		printk(KERN_DEBUG "changes=0x%x, type=%u, ",
819 			c->changes, c->type);
820 		if (c->type == V4L2_CTRL_TYPE_INTEGER64)
821 			pr_cont("value64=%lld, ", c->value64);
822 		else
823 			pr_cont("value=%d, ", c->value);
824 		pr_cont("flags=0x%x, minimum=%d, maximum=%d, step=%d, "
825 			"default_value=%d\n",
826 			c->flags, c->minimum, c->maximum,
827 			c->step, c->default_value);
828 		break;
829 	case V4L2_EVENT_FRAME_SYNC:
830 		pr_cont("frame_sequence=%u\n",
831 			p->u.frame_sync.frame_sequence);
832 		break;
833 	}
834 }
835 
836 static void v4l_print_event_subscription(const void *arg, bool write_only)
837 {
838 	const struct v4l2_event_subscription *p = arg;
839 
840 	pr_cont("type=0x%x, id=0x%x, flags=0x%x\n",
841 			p->type, p->id, p->flags);
842 }
843 
844 static void v4l_print_sliced_vbi_cap(const void *arg, bool write_only)
845 {
846 	const struct v4l2_sliced_vbi_cap *p = arg;
847 	int i;
848 
849 	pr_cont("type=%s, service_set=0x%08x\n",
850 			prt_names(p->type, v4l2_type_names), p->service_set);
851 	for (i = 0; i < 24; i++)
852 		printk(KERN_DEBUG "line[%02u]=0x%04x, 0x%04x\n", i,
853 				p->service_lines[0][i],
854 				p->service_lines[1][i]);
855 }
856 
857 static void v4l_print_freq_band(const void *arg, bool write_only)
858 {
859 	const struct v4l2_frequency_band *p = arg;
860 
861 	pr_cont("tuner=%u, type=%u, index=%u, capability=0x%x, "
862 		"rangelow=%u, rangehigh=%u, modulation=0x%x\n",
863 			p->tuner, p->type, p->index,
864 			p->capability, p->rangelow,
865 			p->rangehigh, p->modulation);
866 }
867 
868 static void v4l_print_edid(const void *arg, bool write_only)
869 {
870 	const struct v4l2_edid *p = arg;
871 
872 	pr_cont("pad=%u, start_block=%u, blocks=%u\n",
873 		p->pad, p->start_block, p->blocks);
874 }
875 
876 static void v4l_print_u32(const void *arg, bool write_only)
877 {
878 	pr_cont("value=%u\n", *(const u32 *)arg);
879 }
880 
881 static void v4l_print_newline(const void *arg, bool write_only)
882 {
883 	pr_cont("\n");
884 }
885 
886 static void v4l_print_default(const void *arg, bool write_only)
887 {
888 	pr_cont("driver-specific ioctl\n");
889 }
890 
891 static int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)
892 {
893 	__u32 i;
894 
895 	/* zero the reserved fields */
896 	c->reserved[0] = c->reserved[1] = 0;
897 	for (i = 0; i < c->count; i++)
898 		c->controls[i].reserved2[0] = 0;
899 
900 	/* V4L2_CID_PRIVATE_BASE cannot be used as control class
901 	   when using extended controls.
902 	   Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
903 	   is it allowed for backwards compatibility.
904 	 */
905 	if (!allow_priv && c->ctrl_class == V4L2_CID_PRIVATE_BASE)
906 		return 0;
907 	if (c->ctrl_class == 0)
908 		return 1;
909 	/* Check that all controls are from the same control class. */
910 	for (i = 0; i < c->count; i++) {
911 		if (V4L2_CTRL_ID2CLASS(c->controls[i].id) != c->ctrl_class) {
912 			c->error_idx = i;
913 			return 0;
914 		}
915 	}
916 	return 1;
917 }
918 
919 static int check_fmt(struct file *file, enum v4l2_buf_type type)
920 {
921 	struct video_device *vfd = video_devdata(file);
922 	const struct v4l2_ioctl_ops *ops = vfd->ioctl_ops;
923 	bool is_vid = vfd->vfl_type == VFL_TYPE_GRABBER;
924 	bool is_vbi = vfd->vfl_type == VFL_TYPE_VBI;
925 	bool is_sdr = vfd->vfl_type == VFL_TYPE_SDR;
926 	bool is_rx = vfd->vfl_dir != VFL_DIR_TX;
927 	bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
928 
929 	if (ops == NULL)
930 		return -EINVAL;
931 
932 	switch (type) {
933 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
934 		if (is_vid && is_rx &&
935 		    (ops->vidioc_g_fmt_vid_cap || ops->vidioc_g_fmt_vid_cap_mplane))
936 			return 0;
937 		break;
938 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
939 		if (is_vid && is_rx && ops->vidioc_g_fmt_vid_cap_mplane)
940 			return 0;
941 		break;
942 	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
943 		if (is_vid && is_rx && ops->vidioc_g_fmt_vid_overlay)
944 			return 0;
945 		break;
946 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
947 		if (is_vid && is_tx &&
948 		    (ops->vidioc_g_fmt_vid_out || ops->vidioc_g_fmt_vid_out_mplane))
949 			return 0;
950 		break;
951 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
952 		if (is_vid && is_tx && ops->vidioc_g_fmt_vid_out_mplane)
953 			return 0;
954 		break;
955 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
956 		if (is_vid && is_tx && ops->vidioc_g_fmt_vid_out_overlay)
957 			return 0;
958 		break;
959 	case V4L2_BUF_TYPE_VBI_CAPTURE:
960 		if (is_vbi && is_rx && ops->vidioc_g_fmt_vbi_cap)
961 			return 0;
962 		break;
963 	case V4L2_BUF_TYPE_VBI_OUTPUT:
964 		if (is_vbi && is_tx && ops->vidioc_g_fmt_vbi_out)
965 			return 0;
966 		break;
967 	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
968 		if (is_vbi && is_rx && ops->vidioc_g_fmt_sliced_vbi_cap)
969 			return 0;
970 		break;
971 	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
972 		if (is_vbi && is_tx && ops->vidioc_g_fmt_sliced_vbi_out)
973 			return 0;
974 		break;
975 	case V4L2_BUF_TYPE_SDR_CAPTURE:
976 		if (is_sdr && is_rx && ops->vidioc_g_fmt_sdr_cap)
977 			return 0;
978 		break;
979 	case V4L2_BUF_TYPE_SDR_OUTPUT:
980 		if (is_sdr && is_tx && ops->vidioc_g_fmt_sdr_out)
981 			return 0;
982 		break;
983 	default:
984 		break;
985 	}
986 	return -EINVAL;
987 }
988 
989 static void v4l_sanitize_format(struct v4l2_format *fmt)
990 {
991 	unsigned int offset;
992 
993 	/*
994 	 * The v4l2_pix_format structure has been extended with fields that were
995 	 * not previously required to be set to zero by applications. The priv
996 	 * field, when set to a magic value, indicates the the extended fields
997 	 * are valid. Otherwise they will contain undefined values. To simplify
998 	 * the API towards drivers zero the extended fields and set the priv
999 	 * field to the magic value when the extended pixel format structure
1000 	 * isn't used by applications.
1001 	 */
1002 
1003 	if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
1004 	    fmt->type != V4L2_BUF_TYPE_VIDEO_OUTPUT)
1005 		return;
1006 
1007 	if (fmt->fmt.pix.priv == V4L2_PIX_FMT_PRIV_MAGIC)
1008 		return;
1009 
1010 	fmt->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1011 
1012 	offset = offsetof(struct v4l2_pix_format, priv)
1013 	       + sizeof(fmt->fmt.pix.priv);
1014 	memset(((void *)&fmt->fmt.pix) + offset, 0,
1015 	       sizeof(fmt->fmt.pix) - offset);
1016 }
1017 
1018 static int v4l_querycap(const struct v4l2_ioctl_ops *ops,
1019 				struct file *file, void *fh, void *arg)
1020 {
1021 	struct v4l2_capability *cap = (struct v4l2_capability *)arg;
1022 	int ret;
1023 
1024 	cap->version = LINUX_VERSION_CODE;
1025 
1026 	ret = ops->vidioc_querycap(file, fh, cap);
1027 
1028 	cap->capabilities |= V4L2_CAP_EXT_PIX_FORMAT;
1029 	/*
1030 	 * Drivers MUST fill in device_caps, so check for this and
1031 	 * warn if it was forgotten.
1032 	 */
1033 	WARN(!(cap->capabilities & V4L2_CAP_DEVICE_CAPS) ||
1034 		!cap->device_caps, "Bad caps for driver %s, %x %x",
1035 		cap->driver, cap->capabilities, cap->device_caps);
1036 	cap->device_caps |= V4L2_CAP_EXT_PIX_FORMAT;
1037 
1038 	return ret;
1039 }
1040 
1041 static int v4l_s_input(const struct v4l2_ioctl_ops *ops,
1042 				struct file *file, void *fh, void *arg)
1043 {
1044 	return ops->vidioc_s_input(file, fh, *(unsigned int *)arg);
1045 }
1046 
1047 static int v4l_s_output(const struct v4l2_ioctl_ops *ops,
1048 				struct file *file, void *fh, void *arg)
1049 {
1050 	return ops->vidioc_s_output(file, fh, *(unsigned int *)arg);
1051 }
1052 
1053 static int v4l_g_priority(const struct v4l2_ioctl_ops *ops,
1054 				struct file *file, void *fh, void *arg)
1055 {
1056 	struct video_device *vfd;
1057 	u32 *p = arg;
1058 
1059 	vfd = video_devdata(file);
1060 	*p = v4l2_prio_max(vfd->prio);
1061 	return 0;
1062 }
1063 
1064 static int v4l_s_priority(const struct v4l2_ioctl_ops *ops,
1065 				struct file *file, void *fh, void *arg)
1066 {
1067 	struct video_device *vfd;
1068 	struct v4l2_fh *vfh;
1069 	u32 *p = arg;
1070 
1071 	vfd = video_devdata(file);
1072 	if (!test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags))
1073 		return -ENOTTY;
1074 	vfh = file->private_data;
1075 	return v4l2_prio_change(vfd->prio, &vfh->prio, *p);
1076 }
1077 
1078 static int v4l_enuminput(const struct v4l2_ioctl_ops *ops,
1079 				struct file *file, void *fh, void *arg)
1080 {
1081 	struct video_device *vfd = video_devdata(file);
1082 	struct v4l2_input *p = arg;
1083 
1084 	/*
1085 	 * We set the flags for CAP_DV_TIMINGS &
1086 	 * CAP_STD here based on ioctl handler provided by the
1087 	 * driver. If the driver doesn't support these
1088 	 * for a specific input, it must override these flags.
1089 	 */
1090 	if (is_valid_ioctl(vfd, VIDIOC_S_STD))
1091 		p->capabilities |= V4L2_IN_CAP_STD;
1092 
1093 	return ops->vidioc_enum_input(file, fh, p);
1094 }
1095 
1096 static int v4l_enumoutput(const struct v4l2_ioctl_ops *ops,
1097 				struct file *file, void *fh, void *arg)
1098 {
1099 	struct video_device *vfd = video_devdata(file);
1100 	struct v4l2_output *p = arg;
1101 
1102 	/*
1103 	 * We set the flags for CAP_DV_TIMINGS &
1104 	 * CAP_STD here based on ioctl handler provided by the
1105 	 * driver. If the driver doesn't support these
1106 	 * for a specific output, it must override these flags.
1107 	 */
1108 	if (is_valid_ioctl(vfd, VIDIOC_S_STD))
1109 		p->capabilities |= V4L2_OUT_CAP_STD;
1110 
1111 	return ops->vidioc_enum_output(file, fh, p);
1112 }
1113 
1114 static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
1115 {
1116 	const unsigned sz = sizeof(fmt->description);
1117 	const char *descr = NULL;
1118 	u32 flags = 0;
1119 
1120 	/*
1121 	 * We depart from the normal coding style here since the descriptions
1122 	 * should be aligned so it is easy to see which descriptions will be
1123 	 * longer than 31 characters (the max length for a description).
1124 	 * And frankly, this is easier to read anyway.
1125 	 *
1126 	 * Note that gcc will use O(log N) comparisons to find the right case.
1127 	 */
1128 	switch (fmt->pixelformat) {
1129 	/* Max description length mask:	descr = "0123456789012345678901234567890" */
1130 	case V4L2_PIX_FMT_RGB332:	descr = "8-bit RGB 3-3-2"; break;
1131 	case V4L2_PIX_FMT_RGB444:	descr = "16-bit A/XRGB 4-4-4-4"; break;
1132 	case V4L2_PIX_FMT_ARGB444:	descr = "16-bit ARGB 4-4-4-4"; break;
1133 	case V4L2_PIX_FMT_XRGB444:	descr = "16-bit XRGB 4-4-4-4"; break;
1134 	case V4L2_PIX_FMT_RGB555:	descr = "16-bit A/XRGB 1-5-5-5"; break;
1135 	case V4L2_PIX_FMT_ARGB555:	descr = "16-bit ARGB 1-5-5-5"; break;
1136 	case V4L2_PIX_FMT_XRGB555:	descr = "16-bit XRGB 1-5-5-5"; break;
1137 	case V4L2_PIX_FMT_RGB565:	descr = "16-bit RGB 5-6-5"; break;
1138 	case V4L2_PIX_FMT_RGB555X:	descr = "16-bit A/XRGB 1-5-5-5 BE"; break;
1139 	case V4L2_PIX_FMT_ARGB555X:	descr = "16-bit ARGB 1-5-5-5 BE"; break;
1140 	case V4L2_PIX_FMT_XRGB555X:	descr = "16-bit XRGB 1-5-5-5 BE"; break;
1141 	case V4L2_PIX_FMT_RGB565X:	descr = "16-bit RGB 5-6-5 BE"; break;
1142 	case V4L2_PIX_FMT_BGR666:	descr = "18-bit BGRX 6-6-6-14"; break;
1143 	case V4L2_PIX_FMT_BGR24:	descr = "24-bit BGR 8-8-8"; break;
1144 	case V4L2_PIX_FMT_RGB24:	descr = "24-bit RGB 8-8-8"; break;
1145 	case V4L2_PIX_FMT_BGR32:	descr = "32-bit BGRA/X 8-8-8-8"; break;
1146 	case V4L2_PIX_FMT_ABGR32:	descr = "32-bit BGRA 8-8-8-8"; break;
1147 	case V4L2_PIX_FMT_XBGR32:	descr = "32-bit BGRX 8-8-8-8"; break;
1148 	case V4L2_PIX_FMT_RGB32:	descr = "32-bit A/XRGB 8-8-8-8"; break;
1149 	case V4L2_PIX_FMT_ARGB32:	descr = "32-bit ARGB 8-8-8-8"; break;
1150 	case V4L2_PIX_FMT_XRGB32:	descr = "32-bit XRGB 8-8-8-8"; break;
1151 	case V4L2_PIX_FMT_GREY:		descr = "8-bit Greyscale"; break;
1152 	case V4L2_PIX_FMT_Y4:		descr = "4-bit Greyscale"; break;
1153 	case V4L2_PIX_FMT_Y6:		descr = "6-bit Greyscale"; break;
1154 	case V4L2_PIX_FMT_Y10:		descr = "10-bit Greyscale"; break;
1155 	case V4L2_PIX_FMT_Y12:		descr = "12-bit Greyscale"; break;
1156 	case V4L2_PIX_FMT_Y16:		descr = "16-bit Greyscale"; break;
1157 	case V4L2_PIX_FMT_Y16_BE:	descr = "16-bit Greyscale BE"; break;
1158 	case V4L2_PIX_FMT_Y10BPACK:	descr = "10-bit Greyscale (Packed)"; break;
1159 	case V4L2_PIX_FMT_PAL8:		descr = "8-bit Palette"; break;
1160 	case V4L2_PIX_FMT_UV8:		descr = "8-bit Chrominance UV 4-4"; break;
1161 	case V4L2_PIX_FMT_YVU410:	descr = "Planar YVU 4:1:0"; break;
1162 	case V4L2_PIX_FMT_YVU420:	descr = "Planar YVU 4:2:0"; break;
1163 	case V4L2_PIX_FMT_YUYV:		descr = "YUYV 4:2:2"; break;
1164 	case V4L2_PIX_FMT_YYUV:		descr = "YYUV 4:2:2"; break;
1165 	case V4L2_PIX_FMT_YVYU:		descr = "YVYU 4:2:2"; break;
1166 	case V4L2_PIX_FMT_UYVY:		descr = "UYVY 4:2:2"; break;
1167 	case V4L2_PIX_FMT_VYUY:		descr = "VYUY 4:2:2"; break;
1168 	case V4L2_PIX_FMT_YUV422P:	descr = "Planar YVU 4:2:2"; break;
1169 	case V4L2_PIX_FMT_YUV411P:	descr = "Planar YUV 4:1:1"; break;
1170 	case V4L2_PIX_FMT_Y41P:		descr = "YUV 4:1:1 (Packed)"; break;
1171 	case V4L2_PIX_FMT_YUV444:	descr = "16-bit A/XYUV 4-4-4-4"; break;
1172 	case V4L2_PIX_FMT_YUV555:	descr = "16-bit A/XYUV 1-5-5-5"; break;
1173 	case V4L2_PIX_FMT_YUV565:	descr = "16-bit YUV 5-6-5"; break;
1174 	case V4L2_PIX_FMT_YUV32:	descr = "32-bit A/XYUV 8-8-8-8"; break;
1175 	case V4L2_PIX_FMT_YUV410:	descr = "Planar YUV 4:1:0"; break;
1176 	case V4L2_PIX_FMT_YUV420:	descr = "Planar YUV 4:2:0"; break;
1177 	case V4L2_PIX_FMT_HI240:	descr = "8-bit Dithered RGB (BTTV)"; break;
1178 	case V4L2_PIX_FMT_HM12:		descr = "YUV 4:2:0 (16x16 Macroblocks)"; break;
1179 	case V4L2_PIX_FMT_M420:		descr = "YUV 4:2:0 (M420)"; break;
1180 	case V4L2_PIX_FMT_NV12:		descr = "Y/CbCr 4:2:0"; break;
1181 	case V4L2_PIX_FMT_NV21:		descr = "Y/CrCb 4:2:0"; break;
1182 	case V4L2_PIX_FMT_NV16:		descr = "Y/CbCr 4:2:2"; break;
1183 	case V4L2_PIX_FMT_NV61:		descr = "Y/CrCb 4:2:2"; break;
1184 	case V4L2_PIX_FMT_NV24:		descr = "Y/CbCr 4:4:4"; break;
1185 	case V4L2_PIX_FMT_NV42:		descr = "Y/CrCb 4:4:4"; break;
1186 	case V4L2_PIX_FMT_NV12M:	descr = "Y/CbCr 4:2:0 (N-C)"; break;
1187 	case V4L2_PIX_FMT_NV21M:	descr = "Y/CrCb 4:2:0 (N-C)"; break;
1188 	case V4L2_PIX_FMT_NV16M:	descr = "Y/CbCr 4:2:2 (N-C)"; break;
1189 	case V4L2_PIX_FMT_NV61M:	descr = "Y/CrCb 4:2:2 (N-C)"; break;
1190 	case V4L2_PIX_FMT_NV12MT:	descr = "Y/CbCr 4:2:0 (64x32 MB, N-C)"; break;
1191 	case V4L2_PIX_FMT_NV12MT_16X16:	descr = "Y/CbCr 4:2:0 (16x16 MB, N-C)"; break;
1192 	case V4L2_PIX_FMT_YUV420M:	descr = "Planar YUV 4:2:0 (N-C)"; break;
1193 	case V4L2_PIX_FMT_YVU420M:	descr = "Planar YVU 4:2:0 (N-C)"; break;
1194 	case V4L2_PIX_FMT_SBGGR8:	descr = "8-bit Bayer BGBG/GRGR"; break;
1195 	case V4L2_PIX_FMT_SGBRG8:	descr = "8-bit Bayer GBGB/RGRG"; break;
1196 	case V4L2_PIX_FMT_SGRBG8:	descr = "8-bit Bayer GRGR/BGBG"; break;
1197 	case V4L2_PIX_FMT_SRGGB8:	descr = "8-bit Bayer RGRG/GBGB"; break;
1198 	case V4L2_PIX_FMT_SBGGR10:	descr = "10-bit Bayer BGBG/GRGR"; break;
1199 	case V4L2_PIX_FMT_SGBRG10:	descr = "10-bit Bayer GBGB/RGRG"; break;
1200 	case V4L2_PIX_FMT_SGRBG10:	descr = "10-bit Bayer GRGR/BGBG"; break;
1201 	case V4L2_PIX_FMT_SRGGB10:	descr = "10-bit Bayer RGRG/GBGB"; break;
1202 	case V4L2_PIX_FMT_SBGGR12:	descr = "12-bit Bayer BGBG/GRGR"; break;
1203 	case V4L2_PIX_FMT_SGBRG12:	descr = "12-bit Bayer GBGB/RGRG"; break;
1204 	case V4L2_PIX_FMT_SGRBG12:	descr = "12-bit Bayer GRGR/BGBG"; break;
1205 	case V4L2_PIX_FMT_SRGGB12:	descr = "12-bit Bayer RGRG/GBGB"; break;
1206 	case V4L2_PIX_FMT_SBGGR10P:	descr = "10-bit Bayer BGBG/GRGR Packed"; break;
1207 	case V4L2_PIX_FMT_SGBRG10P:	descr = "10-bit Bayer GBGB/RGRG Packed"; break;
1208 	case V4L2_PIX_FMT_SGRBG10P:	descr = "10-bit Bayer GRGR/BGBG Packed"; break;
1209 	case V4L2_PIX_FMT_SRGGB10P:	descr = "10-bit Bayer RGRG/GBGB Packed"; break;
1210 	case V4L2_PIX_FMT_SBGGR10ALAW8:	descr = "8-bit Bayer BGBG/GRGR (A-law)"; break;
1211 	case V4L2_PIX_FMT_SGBRG10ALAW8:	descr = "8-bit Bayer GBGB/RGRG (A-law)"; break;
1212 	case V4L2_PIX_FMT_SGRBG10ALAW8:	descr = "8-bit Bayer GRGR/BGBG (A-law)"; break;
1213 	case V4L2_PIX_FMT_SRGGB10ALAW8:	descr = "8-bit Bayer RGRG/GBGB (A-law)"; break;
1214 	case V4L2_PIX_FMT_SBGGR10DPCM8:	descr = "8-bit Bayer BGBG/GRGR (DPCM)"; break;
1215 	case V4L2_PIX_FMT_SGBRG10DPCM8:	descr = "8-bit Bayer GBGB/RGRG (DPCM)"; break;
1216 	case V4L2_PIX_FMT_SGRBG10DPCM8:	descr = "8-bit Bayer GRGR/BGBG (DPCM)"; break;
1217 	case V4L2_PIX_FMT_SRGGB10DPCM8:	descr = "8-bit Bayer RGRG/GBGB (DPCM)"; break;
1218 	case V4L2_PIX_FMT_SBGGR16:	descr = "16-bit Bayer BGBG/GRGR (Exp.)"; break;
1219 	case V4L2_PIX_FMT_SN9C20X_I420:	descr = "GSPCA SN9C20X I420"; break;
1220 	case V4L2_PIX_FMT_SPCA501:	descr = "GSPCA SPCA501"; break;
1221 	case V4L2_PIX_FMT_SPCA505:	descr = "GSPCA SPCA505"; break;
1222 	case V4L2_PIX_FMT_SPCA508:	descr = "GSPCA SPCA508"; break;
1223 	case V4L2_PIX_FMT_STV0680:	descr = "GSPCA STV0680"; break;
1224 	case V4L2_PIX_FMT_TM6000:	descr = "A/V + VBI Mux Packet"; break;
1225 	case V4L2_PIX_FMT_CIT_YYVYUY:	descr = "GSPCA CIT YYVYUY"; break;
1226 	case V4L2_PIX_FMT_KONICA420:	descr = "GSPCA KONICA420"; break;
1227 	case V4L2_SDR_FMT_CU8:		descr = "Complex U8"; break;
1228 	case V4L2_SDR_FMT_CU16LE:	descr = "Complex U16LE"; break;
1229 	case V4L2_SDR_FMT_CS8:		descr = "Complex S8"; break;
1230 	case V4L2_SDR_FMT_CS14LE:	descr = "Complex S14LE"; break;
1231 	case V4L2_SDR_FMT_RU12LE:	descr = "Real U12LE"; break;
1232 
1233 	default:
1234 		/* Compressed formats */
1235 		flags = V4L2_FMT_FLAG_COMPRESSED;
1236 		switch (fmt->pixelformat) {
1237 		/* Max description length mask:	descr = "0123456789012345678901234567890" */
1238 		case V4L2_PIX_FMT_MJPEG:	descr = "Motion-JPEG"; break;
1239 		case V4L2_PIX_FMT_JPEG:		descr = "JFIF JPEG"; break;
1240 		case V4L2_PIX_FMT_DV:		descr = "1394"; break;
1241 		case V4L2_PIX_FMT_MPEG:		descr = "MPEG-1/2/4"; break;
1242 		case V4L2_PIX_FMT_H264:		descr = "H.264"; break;
1243 		case V4L2_PIX_FMT_H264_NO_SC:	descr = "H.264 (No Start Codes)"; break;
1244 		case V4L2_PIX_FMT_H264_MVC:	descr = "H.264 MVC"; break;
1245 		case V4L2_PIX_FMT_H263:		descr = "H.263"; break;
1246 		case V4L2_PIX_FMT_MPEG1:	descr = "MPEG-1 ES"; break;
1247 		case V4L2_PIX_FMT_MPEG2:	descr = "MPEG-2 ES"; break;
1248 		case V4L2_PIX_FMT_MPEG4:	descr = "MPEG-4 part 2 ES"; break;
1249 		case V4L2_PIX_FMT_XVID:		descr = "Xvid"; break;
1250 		case V4L2_PIX_FMT_VC1_ANNEX_G:	descr = "VC-1 (SMPTE 412M Annex G)"; break;
1251 		case V4L2_PIX_FMT_VC1_ANNEX_L:	descr = "VC-1 (SMPTE 412M Annex L)"; break;
1252 		case V4L2_PIX_FMT_VP8:		descr = "VP8"; break;
1253 		case V4L2_PIX_FMT_CPIA1:	descr = "GSPCA CPiA YUV"; break;
1254 		case V4L2_PIX_FMT_WNVA:		descr = "WNVA"; break;
1255 		case V4L2_PIX_FMT_SN9C10X:	descr = "GSPCA SN9C10X"; break;
1256 		case V4L2_PIX_FMT_PWC1:		descr = "Raw Philips Webcam Type (Old)"; break;
1257 		case V4L2_PIX_FMT_PWC2:		descr = "Raw Philips Webcam Type (New)"; break;
1258 		case V4L2_PIX_FMT_ET61X251:	descr = "GSPCA ET61X251"; break;
1259 		case V4L2_PIX_FMT_SPCA561:	descr = "GSPCA SPCA561"; break;
1260 		case V4L2_PIX_FMT_PAC207:	descr = "GSPCA PAC207"; break;
1261 		case V4L2_PIX_FMT_MR97310A:	descr = "GSPCA MR97310A"; break;
1262 		case V4L2_PIX_FMT_JL2005BCD:	descr = "GSPCA JL2005BCD"; break;
1263 		case V4L2_PIX_FMT_SN9C2028:	descr = "GSPCA SN9C2028"; break;
1264 		case V4L2_PIX_FMT_SQ905C:	descr = "GSPCA SQ905C"; break;
1265 		case V4L2_PIX_FMT_PJPG:		descr = "GSPCA PJPG"; break;
1266 		case V4L2_PIX_FMT_OV511:	descr = "GSPCA OV511"; break;
1267 		case V4L2_PIX_FMT_OV518:	descr = "GSPCA OV518"; break;
1268 		case V4L2_PIX_FMT_JPGL:		descr = "JPEG Lite"; break;
1269 		case V4L2_PIX_FMT_SE401:	descr = "GSPCA SE401"; break;
1270 		case V4L2_PIX_FMT_S5C_UYVY_JPG:	descr = "S5C73MX interleaved UYVY/JPEG"; break;
1271 		default:
1272 			WARN(1, "Unknown pixelformat 0x%08x\n", fmt->pixelformat);
1273 			if (fmt->description[0])
1274 				return;
1275 			flags = 0;
1276 			snprintf(fmt->description, sz, "%c%c%c%c%s",
1277 					(char)(fmt->pixelformat & 0x7f),
1278 					(char)((fmt->pixelformat >> 8) & 0x7f),
1279 					(char)((fmt->pixelformat >> 16) & 0x7f),
1280 					(char)((fmt->pixelformat >> 24) & 0x7f),
1281 					(fmt->pixelformat & (1 << 31)) ? "-BE" : "");
1282 			break;
1283 		}
1284 	}
1285 
1286 	if (descr)
1287 		WARN_ON(strlcpy(fmt->description, descr, sz) >= sz);
1288 	fmt->flags = flags;
1289 }
1290 
1291 static int v4l_enum_fmt(const struct v4l2_ioctl_ops *ops,
1292 				struct file *file, void *fh, void *arg)
1293 {
1294 	struct v4l2_fmtdesc *p = arg;
1295 	struct video_device *vfd = video_devdata(file);
1296 	bool is_vid = vfd->vfl_type == VFL_TYPE_GRABBER;
1297 	bool is_sdr = vfd->vfl_type == VFL_TYPE_SDR;
1298 	bool is_rx = vfd->vfl_dir != VFL_DIR_TX;
1299 	bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
1300 	int ret = -EINVAL;
1301 
1302 	switch (p->type) {
1303 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1304 		if (unlikely(!is_rx || !is_vid || !ops->vidioc_enum_fmt_vid_cap))
1305 			break;
1306 		ret = ops->vidioc_enum_fmt_vid_cap(file, fh, arg);
1307 		break;
1308 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
1309 		if (unlikely(!is_rx || !is_vid || !ops->vidioc_enum_fmt_vid_cap_mplane))
1310 			break;
1311 		ret = ops->vidioc_enum_fmt_vid_cap_mplane(file, fh, arg);
1312 		break;
1313 	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
1314 		if (unlikely(!is_rx || !is_vid || !ops->vidioc_enum_fmt_vid_overlay))
1315 			break;
1316 		ret = ops->vidioc_enum_fmt_vid_overlay(file, fh, arg);
1317 		break;
1318 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1319 		if (unlikely(!is_tx || !is_vid || !ops->vidioc_enum_fmt_vid_out))
1320 			break;
1321 		ret = ops->vidioc_enum_fmt_vid_out(file, fh, arg);
1322 		break;
1323 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
1324 		if (unlikely(!is_tx || !is_vid || !ops->vidioc_enum_fmt_vid_out_mplane))
1325 			break;
1326 		ret = ops->vidioc_enum_fmt_vid_out_mplane(file, fh, arg);
1327 		break;
1328 	case V4L2_BUF_TYPE_SDR_CAPTURE:
1329 		if (unlikely(!is_rx || !is_sdr || !ops->vidioc_enum_fmt_sdr_cap))
1330 			break;
1331 		ret = ops->vidioc_enum_fmt_sdr_cap(file, fh, arg);
1332 		break;
1333 	case V4L2_BUF_TYPE_SDR_OUTPUT:
1334 		if (unlikely(!is_tx || !is_sdr || !ops->vidioc_enum_fmt_sdr_out))
1335 			break;
1336 		ret = ops->vidioc_enum_fmt_sdr_out(file, fh, arg);
1337 		break;
1338 	}
1339 	if (ret == 0)
1340 		v4l_fill_fmtdesc(p);
1341 	return ret;
1342 }
1343 
1344 static int v4l_g_fmt(const struct v4l2_ioctl_ops *ops,
1345 				struct file *file, void *fh, void *arg)
1346 {
1347 	struct v4l2_format *p = arg;
1348 	struct video_device *vfd = video_devdata(file);
1349 	bool is_vid = vfd->vfl_type == VFL_TYPE_GRABBER;
1350 	bool is_sdr = vfd->vfl_type == VFL_TYPE_SDR;
1351 	bool is_rx = vfd->vfl_dir != VFL_DIR_TX;
1352 	bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
1353 	int ret;
1354 
1355 	/*
1356 	 * fmt can't be cleared for these overlay types due to the 'clips'
1357 	 * 'clipcount' and 'bitmap' pointers in struct v4l2_window.
1358 	 * Those are provided by the user. So handle these two overlay types
1359 	 * first, and then just do a simple memset for the other types.
1360 	 */
1361 	switch (p->type) {
1362 	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
1363 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY: {
1364 		struct v4l2_clip __user *clips = p->fmt.win.clips;
1365 		u32 clipcount = p->fmt.win.clipcount;
1366 		void __user *bitmap = p->fmt.win.bitmap;
1367 
1368 		memset(&p->fmt, 0, sizeof(p->fmt));
1369 		p->fmt.win.clips = clips;
1370 		p->fmt.win.clipcount = clipcount;
1371 		p->fmt.win.bitmap = bitmap;
1372 		break;
1373 	}
1374 	default:
1375 		memset(&p->fmt, 0, sizeof(p->fmt));
1376 		break;
1377 	}
1378 
1379 	switch (p->type) {
1380 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1381 		if (unlikely(!is_rx || !is_vid || !ops->vidioc_g_fmt_vid_cap))
1382 			break;
1383 		p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1384 		ret = ops->vidioc_g_fmt_vid_cap(file, fh, arg);
1385 		/* just in case the driver zeroed it again */
1386 		p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1387 		return ret;
1388 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
1389 		if (unlikely(!is_rx || !is_vid || !ops->vidioc_g_fmt_vid_cap_mplane))
1390 			break;
1391 		return ops->vidioc_g_fmt_vid_cap_mplane(file, fh, arg);
1392 	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
1393 		if (unlikely(!is_rx || !is_vid || !ops->vidioc_g_fmt_vid_overlay))
1394 			break;
1395 		return ops->vidioc_g_fmt_vid_overlay(file, fh, arg);
1396 	case V4L2_BUF_TYPE_VBI_CAPTURE:
1397 		if (unlikely(!is_rx || is_vid || !ops->vidioc_g_fmt_vbi_cap))
1398 			break;
1399 		return ops->vidioc_g_fmt_vbi_cap(file, fh, arg);
1400 	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
1401 		if (unlikely(!is_rx || is_vid || !ops->vidioc_g_fmt_sliced_vbi_cap))
1402 			break;
1403 		return ops->vidioc_g_fmt_sliced_vbi_cap(file, fh, arg);
1404 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1405 		if (unlikely(!is_tx || !is_vid || !ops->vidioc_g_fmt_vid_out))
1406 			break;
1407 		p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1408 		ret = ops->vidioc_g_fmt_vid_out(file, fh, arg);
1409 		/* just in case the driver zeroed it again */
1410 		p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1411 		return ret;
1412 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
1413 		if (unlikely(!is_tx || !is_vid || !ops->vidioc_g_fmt_vid_out_mplane))
1414 			break;
1415 		return ops->vidioc_g_fmt_vid_out_mplane(file, fh, arg);
1416 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
1417 		if (unlikely(!is_tx || !is_vid || !ops->vidioc_g_fmt_vid_out_overlay))
1418 			break;
1419 		return ops->vidioc_g_fmt_vid_out_overlay(file, fh, arg);
1420 	case V4L2_BUF_TYPE_VBI_OUTPUT:
1421 		if (unlikely(!is_tx || is_vid || !ops->vidioc_g_fmt_vbi_out))
1422 			break;
1423 		return ops->vidioc_g_fmt_vbi_out(file, fh, arg);
1424 	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
1425 		if (unlikely(!is_tx || is_vid || !ops->vidioc_g_fmt_sliced_vbi_out))
1426 			break;
1427 		return ops->vidioc_g_fmt_sliced_vbi_out(file, fh, arg);
1428 	case V4L2_BUF_TYPE_SDR_CAPTURE:
1429 		if (unlikely(!is_rx || !is_sdr || !ops->vidioc_g_fmt_sdr_cap))
1430 			break;
1431 		return ops->vidioc_g_fmt_sdr_cap(file, fh, arg);
1432 	case V4L2_BUF_TYPE_SDR_OUTPUT:
1433 		if (unlikely(!is_tx || !is_sdr || !ops->vidioc_g_fmt_sdr_out))
1434 			break;
1435 		return ops->vidioc_g_fmt_sdr_out(file, fh, arg);
1436 	}
1437 	return -EINVAL;
1438 }
1439 
1440 static int v4l_s_fmt(const struct v4l2_ioctl_ops *ops,
1441 				struct file *file, void *fh, void *arg)
1442 {
1443 	struct v4l2_format *p = arg;
1444 	struct video_device *vfd = video_devdata(file);
1445 	bool is_vid = vfd->vfl_type == VFL_TYPE_GRABBER;
1446 	bool is_sdr = vfd->vfl_type == VFL_TYPE_SDR;
1447 	bool is_rx = vfd->vfl_dir != VFL_DIR_TX;
1448 	bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
1449 	int ret;
1450 
1451 	v4l_sanitize_format(p);
1452 
1453 	switch (p->type) {
1454 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1455 		if (unlikely(!is_rx || !is_vid || !ops->vidioc_s_fmt_vid_cap))
1456 			break;
1457 		CLEAR_AFTER_FIELD(p, fmt.pix);
1458 		ret = ops->vidioc_s_fmt_vid_cap(file, fh, arg);
1459 		/* just in case the driver zeroed it again */
1460 		p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1461 		return ret;
1462 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
1463 		if (unlikely(!is_rx || !is_vid || !ops->vidioc_s_fmt_vid_cap_mplane))
1464 			break;
1465 		CLEAR_AFTER_FIELD(p, fmt.pix_mp);
1466 		return ops->vidioc_s_fmt_vid_cap_mplane(file, fh, arg);
1467 	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
1468 		if (unlikely(!is_rx || !is_vid || !ops->vidioc_s_fmt_vid_overlay))
1469 			break;
1470 		CLEAR_AFTER_FIELD(p, fmt.win);
1471 		return ops->vidioc_s_fmt_vid_overlay(file, fh, arg);
1472 	case V4L2_BUF_TYPE_VBI_CAPTURE:
1473 		if (unlikely(!is_rx || is_vid || !ops->vidioc_s_fmt_vbi_cap))
1474 			break;
1475 		CLEAR_AFTER_FIELD(p, fmt.vbi);
1476 		return ops->vidioc_s_fmt_vbi_cap(file, fh, arg);
1477 	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
1478 		if (unlikely(!is_rx || is_vid || !ops->vidioc_s_fmt_sliced_vbi_cap))
1479 			break;
1480 		CLEAR_AFTER_FIELD(p, fmt.sliced);
1481 		return ops->vidioc_s_fmt_sliced_vbi_cap(file, fh, arg);
1482 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1483 		if (unlikely(!is_tx || !is_vid || !ops->vidioc_s_fmt_vid_out))
1484 			break;
1485 		CLEAR_AFTER_FIELD(p, fmt.pix);
1486 		ret = ops->vidioc_s_fmt_vid_out(file, fh, arg);
1487 		/* just in case the driver zeroed it again */
1488 		p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1489 		return ret;
1490 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
1491 		if (unlikely(!is_tx || !is_vid || !ops->vidioc_s_fmt_vid_out_mplane))
1492 			break;
1493 		CLEAR_AFTER_FIELD(p, fmt.pix_mp);
1494 		return ops->vidioc_s_fmt_vid_out_mplane(file, fh, arg);
1495 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
1496 		if (unlikely(!is_tx || !is_vid || !ops->vidioc_s_fmt_vid_out_overlay))
1497 			break;
1498 		CLEAR_AFTER_FIELD(p, fmt.win);
1499 		return ops->vidioc_s_fmt_vid_out_overlay(file, fh, arg);
1500 	case V4L2_BUF_TYPE_VBI_OUTPUT:
1501 		if (unlikely(!is_tx || is_vid || !ops->vidioc_s_fmt_vbi_out))
1502 			break;
1503 		CLEAR_AFTER_FIELD(p, fmt.vbi);
1504 		return ops->vidioc_s_fmt_vbi_out(file, fh, arg);
1505 	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
1506 		if (unlikely(!is_tx || is_vid || !ops->vidioc_s_fmt_sliced_vbi_out))
1507 			break;
1508 		CLEAR_AFTER_FIELD(p, fmt.sliced);
1509 		return ops->vidioc_s_fmt_sliced_vbi_out(file, fh, arg);
1510 	case V4L2_BUF_TYPE_SDR_CAPTURE:
1511 		if (unlikely(!is_rx || !is_sdr || !ops->vidioc_s_fmt_sdr_cap))
1512 			break;
1513 		CLEAR_AFTER_FIELD(p, fmt.sdr);
1514 		return ops->vidioc_s_fmt_sdr_cap(file, fh, arg);
1515 	case V4L2_BUF_TYPE_SDR_OUTPUT:
1516 		if (unlikely(!is_tx || !is_sdr || !ops->vidioc_s_fmt_sdr_out))
1517 			break;
1518 		CLEAR_AFTER_FIELD(p, fmt.sdr);
1519 		return ops->vidioc_s_fmt_sdr_out(file, fh, arg);
1520 	}
1521 	return -EINVAL;
1522 }
1523 
1524 static int v4l_try_fmt(const struct v4l2_ioctl_ops *ops,
1525 				struct file *file, void *fh, void *arg)
1526 {
1527 	struct v4l2_format *p = arg;
1528 	struct video_device *vfd = video_devdata(file);
1529 	bool is_vid = vfd->vfl_type == VFL_TYPE_GRABBER;
1530 	bool is_sdr = vfd->vfl_type == VFL_TYPE_SDR;
1531 	bool is_rx = vfd->vfl_dir != VFL_DIR_TX;
1532 	bool is_tx = vfd->vfl_dir != VFL_DIR_RX;
1533 	int ret;
1534 
1535 	v4l_sanitize_format(p);
1536 
1537 	switch (p->type) {
1538 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1539 		if (unlikely(!is_rx || !is_vid || !ops->vidioc_try_fmt_vid_cap))
1540 			break;
1541 		CLEAR_AFTER_FIELD(p, fmt.pix);
1542 		ret = ops->vidioc_try_fmt_vid_cap(file, fh, arg);
1543 		/* just in case the driver zeroed it again */
1544 		p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1545 		return ret;
1546 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
1547 		if (unlikely(!is_rx || !is_vid || !ops->vidioc_try_fmt_vid_cap_mplane))
1548 			break;
1549 		CLEAR_AFTER_FIELD(p, fmt.pix_mp);
1550 		return ops->vidioc_try_fmt_vid_cap_mplane(file, fh, arg);
1551 	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
1552 		if (unlikely(!is_rx || !is_vid || !ops->vidioc_try_fmt_vid_overlay))
1553 			break;
1554 		CLEAR_AFTER_FIELD(p, fmt.win);
1555 		return ops->vidioc_try_fmt_vid_overlay(file, fh, arg);
1556 	case V4L2_BUF_TYPE_VBI_CAPTURE:
1557 		if (unlikely(!is_rx || is_vid || !ops->vidioc_try_fmt_vbi_cap))
1558 			break;
1559 		CLEAR_AFTER_FIELD(p, fmt.vbi);
1560 		return ops->vidioc_try_fmt_vbi_cap(file, fh, arg);
1561 	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
1562 		if (unlikely(!is_rx || is_vid || !ops->vidioc_try_fmt_sliced_vbi_cap))
1563 			break;
1564 		CLEAR_AFTER_FIELD(p, fmt.sliced);
1565 		return ops->vidioc_try_fmt_sliced_vbi_cap(file, fh, arg);
1566 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1567 		if (unlikely(!is_tx || !is_vid || !ops->vidioc_try_fmt_vid_out))
1568 			break;
1569 		CLEAR_AFTER_FIELD(p, fmt.pix);
1570 		ret = ops->vidioc_try_fmt_vid_out(file, fh, arg);
1571 		/* just in case the driver zeroed it again */
1572 		p->fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1573 		return ret;
1574 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
1575 		if (unlikely(!is_tx || !is_vid || !ops->vidioc_try_fmt_vid_out_mplane))
1576 			break;
1577 		CLEAR_AFTER_FIELD(p, fmt.pix_mp);
1578 		return ops->vidioc_try_fmt_vid_out_mplane(file, fh, arg);
1579 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
1580 		if (unlikely(!is_tx || !is_vid || !ops->vidioc_try_fmt_vid_out_overlay))
1581 			break;
1582 		CLEAR_AFTER_FIELD(p, fmt.win);
1583 		return ops->vidioc_try_fmt_vid_out_overlay(file, fh, arg);
1584 	case V4L2_BUF_TYPE_VBI_OUTPUT:
1585 		if (unlikely(!is_tx || is_vid || !ops->vidioc_try_fmt_vbi_out))
1586 			break;
1587 		CLEAR_AFTER_FIELD(p, fmt.vbi);
1588 		return ops->vidioc_try_fmt_vbi_out(file, fh, arg);
1589 	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
1590 		if (unlikely(!is_tx || is_vid || !ops->vidioc_try_fmt_sliced_vbi_out))
1591 			break;
1592 		CLEAR_AFTER_FIELD(p, fmt.sliced);
1593 		return ops->vidioc_try_fmt_sliced_vbi_out(file, fh, arg);
1594 	case V4L2_BUF_TYPE_SDR_CAPTURE:
1595 		if (unlikely(!is_rx || !is_sdr || !ops->vidioc_try_fmt_sdr_cap))
1596 			break;
1597 		CLEAR_AFTER_FIELD(p, fmt.sdr);
1598 		return ops->vidioc_try_fmt_sdr_cap(file, fh, arg);
1599 	case V4L2_BUF_TYPE_SDR_OUTPUT:
1600 		if (unlikely(!is_tx || !is_sdr || !ops->vidioc_try_fmt_sdr_out))
1601 			break;
1602 		CLEAR_AFTER_FIELD(p, fmt.sdr);
1603 		return ops->vidioc_try_fmt_sdr_out(file, fh, arg);
1604 	}
1605 	return -EINVAL;
1606 }
1607 
1608 static int v4l_streamon(const struct v4l2_ioctl_ops *ops,
1609 				struct file *file, void *fh, void *arg)
1610 {
1611 	return ops->vidioc_streamon(file, fh, *(unsigned int *)arg);
1612 }
1613 
1614 static int v4l_streamoff(const struct v4l2_ioctl_ops *ops,
1615 				struct file *file, void *fh, void *arg)
1616 {
1617 	return ops->vidioc_streamoff(file, fh, *(unsigned int *)arg);
1618 }
1619 
1620 static int v4l_g_tuner(const struct v4l2_ioctl_ops *ops,
1621 				struct file *file, void *fh, void *arg)
1622 {
1623 	struct video_device *vfd = video_devdata(file);
1624 	struct v4l2_tuner *p = arg;
1625 	int err;
1626 
1627 	p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1628 			V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1629 	err = ops->vidioc_g_tuner(file, fh, p);
1630 	if (!err)
1631 		p->capability |= V4L2_TUNER_CAP_FREQ_BANDS;
1632 	return err;
1633 }
1634 
1635 static int v4l_s_tuner(const struct v4l2_ioctl_ops *ops,
1636 				struct file *file, void *fh, void *arg)
1637 {
1638 	struct video_device *vfd = video_devdata(file);
1639 	struct v4l2_tuner *p = arg;
1640 
1641 	p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1642 			V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1643 	return ops->vidioc_s_tuner(file, fh, p);
1644 }
1645 
1646 static int v4l_g_modulator(const struct v4l2_ioctl_ops *ops,
1647 				struct file *file, void *fh, void *arg)
1648 {
1649 	struct video_device *vfd = video_devdata(file);
1650 	struct v4l2_modulator *p = arg;
1651 	int err;
1652 
1653 	if (vfd->vfl_type == VFL_TYPE_RADIO)
1654 		p->type = V4L2_TUNER_RADIO;
1655 
1656 	err = ops->vidioc_g_modulator(file, fh, p);
1657 	if (!err)
1658 		p->capability |= V4L2_TUNER_CAP_FREQ_BANDS;
1659 	return err;
1660 }
1661 
1662 static int v4l_s_modulator(const struct v4l2_ioctl_ops *ops,
1663 				struct file *file, void *fh, void *arg)
1664 {
1665 	struct video_device *vfd = video_devdata(file);
1666 	struct v4l2_modulator *p = arg;
1667 
1668 	if (vfd->vfl_type == VFL_TYPE_RADIO)
1669 		p->type = V4L2_TUNER_RADIO;
1670 
1671 	return ops->vidioc_s_modulator(file, fh, p);
1672 }
1673 
1674 static int v4l_g_frequency(const struct v4l2_ioctl_ops *ops,
1675 				struct file *file, void *fh, void *arg)
1676 {
1677 	struct video_device *vfd = video_devdata(file);
1678 	struct v4l2_frequency *p = arg;
1679 
1680 	if (vfd->vfl_type == VFL_TYPE_SDR)
1681 		p->type = V4L2_TUNER_SDR;
1682 	else
1683 		p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1684 				V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1685 	return ops->vidioc_g_frequency(file, fh, p);
1686 }
1687 
1688 static int v4l_s_frequency(const struct v4l2_ioctl_ops *ops,
1689 				struct file *file, void *fh, void *arg)
1690 {
1691 	struct video_device *vfd = video_devdata(file);
1692 	const struct v4l2_frequency *p = arg;
1693 	enum v4l2_tuner_type type;
1694 
1695 	if (vfd->vfl_type == VFL_TYPE_SDR) {
1696 		if (p->type != V4L2_TUNER_SDR && p->type != V4L2_TUNER_RF)
1697 			return -EINVAL;
1698 	} else {
1699 		type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1700 				V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1701 		if (type != p->type)
1702 			return -EINVAL;
1703 	}
1704 	return ops->vidioc_s_frequency(file, fh, p);
1705 }
1706 
1707 static int v4l_enumstd(const struct v4l2_ioctl_ops *ops,
1708 				struct file *file, void *fh, void *arg)
1709 {
1710 	struct video_device *vfd = video_devdata(file);
1711 	struct v4l2_standard *p = arg;
1712 	v4l2_std_id id = vfd->tvnorms, curr_id = 0;
1713 	unsigned int index = p->index, i, j = 0;
1714 	const char *descr = "";
1715 
1716 	/* Return -ENODATA if the tvnorms for the current input
1717 	   or output is 0, meaning that it doesn't support this API. */
1718 	if (id == 0)
1719 		return -ENODATA;
1720 
1721 	/* Return norm array in a canonical way */
1722 	for (i = 0; i <= index && id; i++) {
1723 		/* last std value in the standards array is 0, so this
1724 		   while always ends there since (id & 0) == 0. */
1725 		while ((id & standards[j].std) != standards[j].std)
1726 			j++;
1727 		curr_id = standards[j].std;
1728 		descr = standards[j].descr;
1729 		j++;
1730 		if (curr_id == 0)
1731 			break;
1732 		if (curr_id != V4L2_STD_PAL &&
1733 				curr_id != V4L2_STD_SECAM &&
1734 				curr_id != V4L2_STD_NTSC)
1735 			id &= ~curr_id;
1736 	}
1737 	if (i <= index)
1738 		return -EINVAL;
1739 
1740 	v4l2_video_std_construct(p, curr_id, descr);
1741 	return 0;
1742 }
1743 
1744 static int v4l_s_std(const struct v4l2_ioctl_ops *ops,
1745 				struct file *file, void *fh, void *arg)
1746 {
1747 	struct video_device *vfd = video_devdata(file);
1748 	v4l2_std_id id = *(v4l2_std_id *)arg, norm;
1749 
1750 	norm = id & vfd->tvnorms;
1751 	if (vfd->tvnorms && !norm)	/* Check if std is supported */
1752 		return -EINVAL;
1753 
1754 	/* Calls the specific handler */
1755 	return ops->vidioc_s_std(file, fh, norm);
1756 }
1757 
1758 static int v4l_querystd(const struct v4l2_ioctl_ops *ops,
1759 				struct file *file, void *fh, void *arg)
1760 {
1761 	struct video_device *vfd = video_devdata(file);
1762 	v4l2_std_id *p = arg;
1763 
1764 	/*
1765 	 * If no signal is detected, then the driver should return
1766 	 * V4L2_STD_UNKNOWN. Otherwise it should return tvnorms with
1767 	 * any standards that do not apply removed.
1768 	 *
1769 	 * This means that tuners, audio and video decoders can join
1770 	 * their efforts to improve the standards detection.
1771 	 */
1772 	*p = vfd->tvnorms;
1773 	return ops->vidioc_querystd(file, fh, arg);
1774 }
1775 
1776 static int v4l_s_hw_freq_seek(const struct v4l2_ioctl_ops *ops,
1777 				struct file *file, void *fh, void *arg)
1778 {
1779 	struct video_device *vfd = video_devdata(file);
1780 	struct v4l2_hw_freq_seek *p = arg;
1781 	enum v4l2_tuner_type type;
1782 
1783 	/* s_hw_freq_seek is not supported for SDR for now */
1784 	if (vfd->vfl_type == VFL_TYPE_SDR)
1785 		return -EINVAL;
1786 
1787 	type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1788 		V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1789 	if (p->type != type)
1790 		return -EINVAL;
1791 	return ops->vidioc_s_hw_freq_seek(file, fh, p);
1792 }
1793 
1794 static int v4l_overlay(const struct v4l2_ioctl_ops *ops,
1795 				struct file *file, void *fh, void *arg)
1796 {
1797 	return ops->vidioc_overlay(file, fh, *(unsigned int *)arg);
1798 }
1799 
1800 static int v4l_reqbufs(const struct v4l2_ioctl_ops *ops,
1801 				struct file *file, void *fh, void *arg)
1802 {
1803 	struct v4l2_requestbuffers *p = arg;
1804 	int ret = check_fmt(file, p->type);
1805 
1806 	if (ret)
1807 		return ret;
1808 
1809 	CLEAR_AFTER_FIELD(p, memory);
1810 
1811 	return ops->vidioc_reqbufs(file, fh, p);
1812 }
1813 
1814 static int v4l_querybuf(const struct v4l2_ioctl_ops *ops,
1815 				struct file *file, void *fh, void *arg)
1816 {
1817 	struct v4l2_buffer *p = arg;
1818 	int ret = check_fmt(file, p->type);
1819 
1820 	return ret ? ret : ops->vidioc_querybuf(file, fh, p);
1821 }
1822 
1823 static int v4l_qbuf(const struct v4l2_ioctl_ops *ops,
1824 				struct file *file, void *fh, void *arg)
1825 {
1826 	struct v4l2_buffer *p = arg;
1827 	int ret = check_fmt(file, p->type);
1828 
1829 	return ret ? ret : ops->vidioc_qbuf(file, fh, p);
1830 }
1831 
1832 static int v4l_dqbuf(const struct v4l2_ioctl_ops *ops,
1833 				struct file *file, void *fh, void *arg)
1834 {
1835 	struct v4l2_buffer *p = arg;
1836 	int ret = check_fmt(file, p->type);
1837 
1838 	return ret ? ret : ops->vidioc_dqbuf(file, fh, p);
1839 }
1840 
1841 static int v4l_create_bufs(const struct v4l2_ioctl_ops *ops,
1842 				struct file *file, void *fh, void *arg)
1843 {
1844 	struct v4l2_create_buffers *create = arg;
1845 	int ret = check_fmt(file, create->format.type);
1846 
1847 	if (ret)
1848 		return ret;
1849 
1850 	CLEAR_AFTER_FIELD(create, format);
1851 
1852 	v4l_sanitize_format(&create->format);
1853 
1854 	ret = ops->vidioc_create_bufs(file, fh, create);
1855 
1856 	if (create->format.type == V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1857 	    create->format.type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
1858 		create->format.fmt.pix.priv = V4L2_PIX_FMT_PRIV_MAGIC;
1859 
1860 	return ret;
1861 }
1862 
1863 static int v4l_prepare_buf(const struct v4l2_ioctl_ops *ops,
1864 				struct file *file, void *fh, void *arg)
1865 {
1866 	struct v4l2_buffer *b = arg;
1867 	int ret = check_fmt(file, b->type);
1868 
1869 	return ret ? ret : ops->vidioc_prepare_buf(file, fh, b);
1870 }
1871 
1872 static int v4l_g_parm(const struct v4l2_ioctl_ops *ops,
1873 				struct file *file, void *fh, void *arg)
1874 {
1875 	struct v4l2_streamparm *p = arg;
1876 	v4l2_std_id std;
1877 	int ret = check_fmt(file, p->type);
1878 
1879 	if (ret)
1880 		return ret;
1881 	if (ops->vidioc_g_parm)
1882 		return ops->vidioc_g_parm(file, fh, p);
1883 	if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
1884 	    p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
1885 		return -EINVAL;
1886 	p->parm.capture.readbuffers = 2;
1887 	ret = ops->vidioc_g_std(file, fh, &std);
1888 	if (ret == 0)
1889 		v4l2_video_std_frame_period(std, &p->parm.capture.timeperframe);
1890 	return ret;
1891 }
1892 
1893 static int v4l_s_parm(const struct v4l2_ioctl_ops *ops,
1894 				struct file *file, void *fh, void *arg)
1895 {
1896 	struct v4l2_streamparm *p = arg;
1897 	int ret = check_fmt(file, p->type);
1898 
1899 	return ret ? ret : ops->vidioc_s_parm(file, fh, p);
1900 }
1901 
1902 static int v4l_queryctrl(const struct v4l2_ioctl_ops *ops,
1903 				struct file *file, void *fh, void *arg)
1904 {
1905 	struct video_device *vfd = video_devdata(file);
1906 	struct v4l2_queryctrl *p = arg;
1907 	struct v4l2_fh *vfh =
1908 		test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
1909 
1910 	if (vfh && vfh->ctrl_handler)
1911 		return v4l2_queryctrl(vfh->ctrl_handler, p);
1912 	if (vfd->ctrl_handler)
1913 		return v4l2_queryctrl(vfd->ctrl_handler, p);
1914 	if (ops->vidioc_queryctrl)
1915 		return ops->vidioc_queryctrl(file, fh, p);
1916 	return -ENOTTY;
1917 }
1918 
1919 static int v4l_query_ext_ctrl(const struct v4l2_ioctl_ops *ops,
1920 				struct file *file, void *fh, void *arg)
1921 {
1922 	struct video_device *vfd = video_devdata(file);
1923 	struct v4l2_query_ext_ctrl *p = arg;
1924 	struct v4l2_fh *vfh =
1925 		test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
1926 
1927 	if (vfh && vfh->ctrl_handler)
1928 		return v4l2_query_ext_ctrl(vfh->ctrl_handler, p);
1929 	if (vfd->ctrl_handler)
1930 		return v4l2_query_ext_ctrl(vfd->ctrl_handler, p);
1931 	if (ops->vidioc_query_ext_ctrl)
1932 		return ops->vidioc_query_ext_ctrl(file, fh, p);
1933 	return -ENOTTY;
1934 }
1935 
1936 static int v4l_querymenu(const struct v4l2_ioctl_ops *ops,
1937 				struct file *file, void *fh, void *arg)
1938 {
1939 	struct video_device *vfd = video_devdata(file);
1940 	struct v4l2_querymenu *p = arg;
1941 	struct v4l2_fh *vfh =
1942 		test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
1943 
1944 	if (vfh && vfh->ctrl_handler)
1945 		return v4l2_querymenu(vfh->ctrl_handler, p);
1946 	if (vfd->ctrl_handler)
1947 		return v4l2_querymenu(vfd->ctrl_handler, p);
1948 	if (ops->vidioc_querymenu)
1949 		return ops->vidioc_querymenu(file, fh, p);
1950 	return -ENOTTY;
1951 }
1952 
1953 static int v4l_g_ctrl(const struct v4l2_ioctl_ops *ops,
1954 				struct file *file, void *fh, void *arg)
1955 {
1956 	struct video_device *vfd = video_devdata(file);
1957 	struct v4l2_control *p = arg;
1958 	struct v4l2_fh *vfh =
1959 		test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
1960 	struct v4l2_ext_controls ctrls;
1961 	struct v4l2_ext_control ctrl;
1962 
1963 	if (vfh && vfh->ctrl_handler)
1964 		return v4l2_g_ctrl(vfh->ctrl_handler, p);
1965 	if (vfd->ctrl_handler)
1966 		return v4l2_g_ctrl(vfd->ctrl_handler, p);
1967 	if (ops->vidioc_g_ctrl)
1968 		return ops->vidioc_g_ctrl(file, fh, p);
1969 	if (ops->vidioc_g_ext_ctrls == NULL)
1970 		return -ENOTTY;
1971 
1972 	ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
1973 	ctrls.count = 1;
1974 	ctrls.controls = &ctrl;
1975 	ctrl.id = p->id;
1976 	ctrl.value = p->value;
1977 	if (check_ext_ctrls(&ctrls, 1)) {
1978 		int ret = ops->vidioc_g_ext_ctrls(file, fh, &ctrls);
1979 
1980 		if (ret == 0)
1981 			p->value = ctrl.value;
1982 		return ret;
1983 	}
1984 	return -EINVAL;
1985 }
1986 
1987 static int v4l_s_ctrl(const struct v4l2_ioctl_ops *ops,
1988 				struct file *file, void *fh, void *arg)
1989 {
1990 	struct video_device *vfd = video_devdata(file);
1991 	struct v4l2_control *p = arg;
1992 	struct v4l2_fh *vfh =
1993 		test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
1994 	struct v4l2_ext_controls ctrls;
1995 	struct v4l2_ext_control ctrl;
1996 
1997 	if (vfh && vfh->ctrl_handler)
1998 		return v4l2_s_ctrl(vfh, vfh->ctrl_handler, p);
1999 	if (vfd->ctrl_handler)
2000 		return v4l2_s_ctrl(NULL, vfd->ctrl_handler, p);
2001 	if (ops->vidioc_s_ctrl)
2002 		return ops->vidioc_s_ctrl(file, fh, p);
2003 	if (ops->vidioc_s_ext_ctrls == NULL)
2004 		return -ENOTTY;
2005 
2006 	ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
2007 	ctrls.count = 1;
2008 	ctrls.controls = &ctrl;
2009 	ctrl.id = p->id;
2010 	ctrl.value = p->value;
2011 	if (check_ext_ctrls(&ctrls, 1))
2012 		return ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
2013 	return -EINVAL;
2014 }
2015 
2016 static int v4l_g_ext_ctrls(const struct v4l2_ioctl_ops *ops,
2017 				struct file *file, void *fh, void *arg)
2018 {
2019 	struct video_device *vfd = video_devdata(file);
2020 	struct v4l2_ext_controls *p = arg;
2021 	struct v4l2_fh *vfh =
2022 		test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
2023 
2024 	p->error_idx = p->count;
2025 	if (vfh && vfh->ctrl_handler)
2026 		return v4l2_g_ext_ctrls(vfh->ctrl_handler, p);
2027 	if (vfd->ctrl_handler)
2028 		return v4l2_g_ext_ctrls(vfd->ctrl_handler, p);
2029 	if (ops->vidioc_g_ext_ctrls == NULL)
2030 		return -ENOTTY;
2031 	return check_ext_ctrls(p, 0) ? ops->vidioc_g_ext_ctrls(file, fh, p) :
2032 					-EINVAL;
2033 }
2034 
2035 static int v4l_s_ext_ctrls(const struct v4l2_ioctl_ops *ops,
2036 				struct file *file, void *fh, void *arg)
2037 {
2038 	struct video_device *vfd = video_devdata(file);
2039 	struct v4l2_ext_controls *p = arg;
2040 	struct v4l2_fh *vfh =
2041 		test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
2042 
2043 	p->error_idx = p->count;
2044 	if (vfh && vfh->ctrl_handler)
2045 		return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, p);
2046 	if (vfd->ctrl_handler)
2047 		return v4l2_s_ext_ctrls(NULL, vfd->ctrl_handler, p);
2048 	if (ops->vidioc_s_ext_ctrls == NULL)
2049 		return -ENOTTY;
2050 	return check_ext_ctrls(p, 0) ? ops->vidioc_s_ext_ctrls(file, fh, p) :
2051 					-EINVAL;
2052 }
2053 
2054 static int v4l_try_ext_ctrls(const struct v4l2_ioctl_ops *ops,
2055 				struct file *file, void *fh, void *arg)
2056 {
2057 	struct video_device *vfd = video_devdata(file);
2058 	struct v4l2_ext_controls *p = arg;
2059 	struct v4l2_fh *vfh =
2060 		test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags) ? fh : NULL;
2061 
2062 	p->error_idx = p->count;
2063 	if (vfh && vfh->ctrl_handler)
2064 		return v4l2_try_ext_ctrls(vfh->ctrl_handler, p);
2065 	if (vfd->ctrl_handler)
2066 		return v4l2_try_ext_ctrls(vfd->ctrl_handler, p);
2067 	if (ops->vidioc_try_ext_ctrls == NULL)
2068 		return -ENOTTY;
2069 	return check_ext_ctrls(p, 0) ? ops->vidioc_try_ext_ctrls(file, fh, p) :
2070 					-EINVAL;
2071 }
2072 
2073 static int v4l_g_crop(const struct v4l2_ioctl_ops *ops,
2074 				struct file *file, void *fh, void *arg)
2075 {
2076 	struct v4l2_crop *p = arg;
2077 	struct v4l2_selection s = {
2078 		.type = p->type,
2079 	};
2080 	int ret;
2081 
2082 	if (ops->vidioc_g_crop)
2083 		return ops->vidioc_g_crop(file, fh, p);
2084 	/* simulate capture crop using selection api */
2085 
2086 	/* crop means compose for output devices */
2087 	if (V4L2_TYPE_IS_OUTPUT(p->type))
2088 		s.target = V4L2_SEL_TGT_COMPOSE_ACTIVE;
2089 	else
2090 		s.target = V4L2_SEL_TGT_CROP_ACTIVE;
2091 
2092 	ret = ops->vidioc_g_selection(file, fh, &s);
2093 
2094 	/* copying results to old structure on success */
2095 	if (!ret)
2096 		p->c = s.r;
2097 	return ret;
2098 }
2099 
2100 static int v4l_s_crop(const struct v4l2_ioctl_ops *ops,
2101 				struct file *file, void *fh, void *arg)
2102 {
2103 	struct v4l2_crop *p = arg;
2104 	struct v4l2_selection s = {
2105 		.type = p->type,
2106 		.r = p->c,
2107 	};
2108 
2109 	if (ops->vidioc_s_crop)
2110 		return ops->vidioc_s_crop(file, fh, p);
2111 	/* simulate capture crop using selection api */
2112 
2113 	/* crop means compose for output devices */
2114 	if (V4L2_TYPE_IS_OUTPUT(p->type))
2115 		s.target = V4L2_SEL_TGT_COMPOSE_ACTIVE;
2116 	else
2117 		s.target = V4L2_SEL_TGT_CROP_ACTIVE;
2118 
2119 	return ops->vidioc_s_selection(file, fh, &s);
2120 }
2121 
2122 static int v4l_cropcap(const struct v4l2_ioctl_ops *ops,
2123 				struct file *file, void *fh, void *arg)
2124 {
2125 	struct v4l2_cropcap *p = arg;
2126 
2127 	if (ops->vidioc_g_selection) {
2128 		struct v4l2_selection s = { .type = p->type };
2129 		int ret;
2130 
2131 		/* obtaining bounds */
2132 		if (V4L2_TYPE_IS_OUTPUT(p->type))
2133 			s.target = V4L2_SEL_TGT_COMPOSE_BOUNDS;
2134 		else
2135 			s.target = V4L2_SEL_TGT_CROP_BOUNDS;
2136 
2137 		ret = ops->vidioc_g_selection(file, fh, &s);
2138 		if (ret)
2139 			return ret;
2140 		p->bounds = s.r;
2141 
2142 		/* obtaining defrect */
2143 		if (V4L2_TYPE_IS_OUTPUT(p->type))
2144 			s.target = V4L2_SEL_TGT_COMPOSE_DEFAULT;
2145 		else
2146 			s.target = V4L2_SEL_TGT_CROP_DEFAULT;
2147 
2148 		ret = ops->vidioc_g_selection(file, fh, &s);
2149 		if (ret)
2150 			return ret;
2151 		p->defrect = s.r;
2152 	}
2153 
2154 	/* setting trivial pixelaspect */
2155 	p->pixelaspect.numerator = 1;
2156 	p->pixelaspect.denominator = 1;
2157 
2158 	if (ops->vidioc_cropcap)
2159 		return ops->vidioc_cropcap(file, fh, p);
2160 
2161 	return 0;
2162 }
2163 
2164 static int v4l_log_status(const struct v4l2_ioctl_ops *ops,
2165 				struct file *file, void *fh, void *arg)
2166 {
2167 	struct video_device *vfd = video_devdata(file);
2168 	int ret;
2169 
2170 	if (vfd->v4l2_dev)
2171 		pr_info("%s: =================  START STATUS  =================\n",
2172 			vfd->v4l2_dev->name);
2173 	ret = ops->vidioc_log_status(file, fh);
2174 	if (vfd->v4l2_dev)
2175 		pr_info("%s: ==================  END STATUS  ==================\n",
2176 			vfd->v4l2_dev->name);
2177 	return ret;
2178 }
2179 
2180 static int v4l_dbg_g_register(const struct v4l2_ioctl_ops *ops,
2181 				struct file *file, void *fh, void *arg)
2182 {
2183 #ifdef CONFIG_VIDEO_ADV_DEBUG
2184 	struct v4l2_dbg_register *p = arg;
2185 	struct video_device *vfd = video_devdata(file);
2186 	struct v4l2_subdev *sd;
2187 	int idx = 0;
2188 
2189 	if (!capable(CAP_SYS_ADMIN))
2190 		return -EPERM;
2191 	if (p->match.type == V4L2_CHIP_MATCH_SUBDEV) {
2192 		if (vfd->v4l2_dev == NULL)
2193 			return -EINVAL;
2194 		v4l2_device_for_each_subdev(sd, vfd->v4l2_dev)
2195 			if (p->match.addr == idx++)
2196 				return v4l2_subdev_call(sd, core, g_register, p);
2197 		return -EINVAL;
2198 	}
2199 	if (ops->vidioc_g_register && p->match.type == V4L2_CHIP_MATCH_BRIDGE &&
2200 	    (ops->vidioc_g_chip_info || p->match.addr == 0))
2201 		return ops->vidioc_g_register(file, fh, p);
2202 	return -EINVAL;
2203 #else
2204 	return -ENOTTY;
2205 #endif
2206 }
2207 
2208 static int v4l_dbg_s_register(const struct v4l2_ioctl_ops *ops,
2209 				struct file *file, void *fh, void *arg)
2210 {
2211 #ifdef CONFIG_VIDEO_ADV_DEBUG
2212 	const struct v4l2_dbg_register *p = arg;
2213 	struct video_device *vfd = video_devdata(file);
2214 	struct v4l2_subdev *sd;
2215 	int idx = 0;
2216 
2217 	if (!capable(CAP_SYS_ADMIN))
2218 		return -EPERM;
2219 	if (p->match.type == V4L2_CHIP_MATCH_SUBDEV) {
2220 		if (vfd->v4l2_dev == NULL)
2221 			return -EINVAL;
2222 		v4l2_device_for_each_subdev(sd, vfd->v4l2_dev)
2223 			if (p->match.addr == idx++)
2224 				return v4l2_subdev_call(sd, core, s_register, p);
2225 		return -EINVAL;
2226 	}
2227 	if (ops->vidioc_s_register && p->match.type == V4L2_CHIP_MATCH_BRIDGE &&
2228 	    (ops->vidioc_g_chip_info || p->match.addr == 0))
2229 		return ops->vidioc_s_register(file, fh, p);
2230 	return -EINVAL;
2231 #else
2232 	return -ENOTTY;
2233 #endif
2234 }
2235 
2236 static int v4l_dbg_g_chip_info(const struct v4l2_ioctl_ops *ops,
2237 				struct file *file, void *fh, void *arg)
2238 {
2239 #ifdef CONFIG_VIDEO_ADV_DEBUG
2240 	struct video_device *vfd = video_devdata(file);
2241 	struct v4l2_dbg_chip_info *p = arg;
2242 	struct v4l2_subdev *sd;
2243 	int idx = 0;
2244 
2245 	switch (p->match.type) {
2246 	case V4L2_CHIP_MATCH_BRIDGE:
2247 		if (ops->vidioc_s_register)
2248 			p->flags |= V4L2_CHIP_FL_WRITABLE;
2249 		if (ops->vidioc_g_register)
2250 			p->flags |= V4L2_CHIP_FL_READABLE;
2251 		strlcpy(p->name, vfd->v4l2_dev->name, sizeof(p->name));
2252 		if (ops->vidioc_g_chip_info)
2253 			return ops->vidioc_g_chip_info(file, fh, arg);
2254 		if (p->match.addr)
2255 			return -EINVAL;
2256 		return 0;
2257 
2258 	case V4L2_CHIP_MATCH_SUBDEV:
2259 		if (vfd->v4l2_dev == NULL)
2260 			break;
2261 		v4l2_device_for_each_subdev(sd, vfd->v4l2_dev) {
2262 			if (p->match.addr != idx++)
2263 				continue;
2264 			if (sd->ops->core && sd->ops->core->s_register)
2265 				p->flags |= V4L2_CHIP_FL_WRITABLE;
2266 			if (sd->ops->core && sd->ops->core->g_register)
2267 				p->flags |= V4L2_CHIP_FL_READABLE;
2268 			strlcpy(p->name, sd->name, sizeof(p->name));
2269 			return 0;
2270 		}
2271 		break;
2272 	}
2273 	return -EINVAL;
2274 #else
2275 	return -ENOTTY;
2276 #endif
2277 }
2278 
2279 static int v4l_dqevent(const struct v4l2_ioctl_ops *ops,
2280 				struct file *file, void *fh, void *arg)
2281 {
2282 	return v4l2_event_dequeue(fh, arg, file->f_flags & O_NONBLOCK);
2283 }
2284 
2285 static int v4l_subscribe_event(const struct v4l2_ioctl_ops *ops,
2286 				struct file *file, void *fh, void *arg)
2287 {
2288 	return ops->vidioc_subscribe_event(fh, arg);
2289 }
2290 
2291 static int v4l_unsubscribe_event(const struct v4l2_ioctl_ops *ops,
2292 				struct file *file, void *fh, void *arg)
2293 {
2294 	return ops->vidioc_unsubscribe_event(fh, arg);
2295 }
2296 
2297 static int v4l_g_sliced_vbi_cap(const struct v4l2_ioctl_ops *ops,
2298 				struct file *file, void *fh, void *arg)
2299 {
2300 	struct v4l2_sliced_vbi_cap *p = arg;
2301 	int ret = check_fmt(file, p->type);
2302 
2303 	if (ret)
2304 		return ret;
2305 
2306 	/* Clear up to type, everything after type is zeroed already */
2307 	memset(p, 0, offsetof(struct v4l2_sliced_vbi_cap, type));
2308 
2309 	return ops->vidioc_g_sliced_vbi_cap(file, fh, p);
2310 }
2311 
2312 static int v4l_enum_freq_bands(const struct v4l2_ioctl_ops *ops,
2313 				struct file *file, void *fh, void *arg)
2314 {
2315 	struct video_device *vfd = video_devdata(file);
2316 	struct v4l2_frequency_band *p = arg;
2317 	enum v4l2_tuner_type type;
2318 	int err;
2319 
2320 	if (vfd->vfl_type == VFL_TYPE_SDR) {
2321 		if (p->type != V4L2_TUNER_SDR && p->type != V4L2_TUNER_RF)
2322 			return -EINVAL;
2323 		type = p->type;
2324 	} else {
2325 		type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
2326 				V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
2327 		if (type != p->type)
2328 			return -EINVAL;
2329 	}
2330 	if (ops->vidioc_enum_freq_bands) {
2331 		err = ops->vidioc_enum_freq_bands(file, fh, p);
2332 		if (err != -ENOTTY)
2333 			return err;
2334 	}
2335 	if (is_valid_ioctl(vfd, VIDIOC_G_TUNER)) {
2336 		struct v4l2_tuner t = {
2337 			.index = p->tuner,
2338 			.type = type,
2339 		};
2340 
2341 		if (p->index)
2342 			return -EINVAL;
2343 		err = ops->vidioc_g_tuner(file, fh, &t);
2344 		if (err)
2345 			return err;
2346 		p->capability = t.capability | V4L2_TUNER_CAP_FREQ_BANDS;
2347 		p->rangelow = t.rangelow;
2348 		p->rangehigh = t.rangehigh;
2349 		p->modulation = (type == V4L2_TUNER_RADIO) ?
2350 			V4L2_BAND_MODULATION_FM : V4L2_BAND_MODULATION_VSB;
2351 		return 0;
2352 	}
2353 	if (is_valid_ioctl(vfd, VIDIOC_G_MODULATOR)) {
2354 		struct v4l2_modulator m = {
2355 			.index = p->tuner,
2356 		};
2357 
2358 		if (type != V4L2_TUNER_RADIO)
2359 			return -EINVAL;
2360 		if (p->index)
2361 			return -EINVAL;
2362 		err = ops->vidioc_g_modulator(file, fh, &m);
2363 		if (err)
2364 			return err;
2365 		p->capability = m.capability | V4L2_TUNER_CAP_FREQ_BANDS;
2366 		p->rangelow = m.rangelow;
2367 		p->rangehigh = m.rangehigh;
2368 		p->modulation = (type == V4L2_TUNER_RADIO) ?
2369 			V4L2_BAND_MODULATION_FM : V4L2_BAND_MODULATION_VSB;
2370 		return 0;
2371 	}
2372 	return -ENOTTY;
2373 }
2374 
2375 struct v4l2_ioctl_info {
2376 	unsigned int ioctl;
2377 	u32 flags;
2378 	const char * const name;
2379 	union {
2380 		u32 offset;
2381 		int (*func)(const struct v4l2_ioctl_ops *ops,
2382 				struct file *file, void *fh, void *p);
2383 	} u;
2384 	void (*debug)(const void *arg, bool write_only);
2385 };
2386 
2387 /* This control needs a priority check */
2388 #define INFO_FL_PRIO	(1 << 0)
2389 /* This control can be valid if the filehandle passes a control handler. */
2390 #define INFO_FL_CTRL	(1 << 1)
2391 /* This is a standard ioctl, no need for special code */
2392 #define INFO_FL_STD	(1 << 2)
2393 /* This is ioctl has its own function */
2394 #define INFO_FL_FUNC	(1 << 3)
2395 /* Queuing ioctl */
2396 #define INFO_FL_QUEUE	(1 << 4)
2397 /* Zero struct from after the field to the end */
2398 #define INFO_FL_CLEAR(v4l2_struct, field)			\
2399 	((offsetof(struct v4l2_struct, field) +			\
2400 	  sizeof(((struct v4l2_struct *)0)->field)) << 16)
2401 #define INFO_FL_CLEAR_MASK (_IOC_SIZEMASK << 16)
2402 
2403 #define IOCTL_INFO_STD(_ioctl, _vidioc, _debug, _flags)			\
2404 	[_IOC_NR(_ioctl)] = {						\
2405 		.ioctl = _ioctl,					\
2406 		.flags = _flags | INFO_FL_STD,				\
2407 		.name = #_ioctl,					\
2408 		.u.offset = offsetof(struct v4l2_ioctl_ops, _vidioc),	\
2409 		.debug = _debug,					\
2410 	}
2411 
2412 #define IOCTL_INFO_FNC(_ioctl, _func, _debug, _flags)			\
2413 	[_IOC_NR(_ioctl)] = {						\
2414 		.ioctl = _ioctl,					\
2415 		.flags = _flags | INFO_FL_FUNC,				\
2416 		.name = #_ioctl,					\
2417 		.u.func = _func,					\
2418 		.debug = _debug,					\
2419 	}
2420 
2421 static struct v4l2_ioctl_info v4l2_ioctls[] = {
2422 	IOCTL_INFO_FNC(VIDIOC_QUERYCAP, v4l_querycap, v4l_print_querycap, 0),
2423 	IOCTL_INFO_FNC(VIDIOC_ENUM_FMT, v4l_enum_fmt, v4l_print_fmtdesc, INFO_FL_CLEAR(v4l2_fmtdesc, type)),
2424 	IOCTL_INFO_FNC(VIDIOC_G_FMT, v4l_g_fmt, v4l_print_format, 0),
2425 	IOCTL_INFO_FNC(VIDIOC_S_FMT, v4l_s_fmt, v4l_print_format, INFO_FL_PRIO),
2426 	IOCTL_INFO_FNC(VIDIOC_REQBUFS, v4l_reqbufs, v4l_print_requestbuffers, INFO_FL_PRIO | INFO_FL_QUEUE),
2427 	IOCTL_INFO_FNC(VIDIOC_QUERYBUF, v4l_querybuf, v4l_print_buffer, INFO_FL_QUEUE | INFO_FL_CLEAR(v4l2_buffer, length)),
2428 	IOCTL_INFO_STD(VIDIOC_G_FBUF, vidioc_g_fbuf, v4l_print_framebuffer, 0),
2429 	IOCTL_INFO_STD(VIDIOC_S_FBUF, vidioc_s_fbuf, v4l_print_framebuffer, INFO_FL_PRIO),
2430 	IOCTL_INFO_FNC(VIDIOC_OVERLAY, v4l_overlay, v4l_print_u32, INFO_FL_PRIO),
2431 	IOCTL_INFO_FNC(VIDIOC_QBUF, v4l_qbuf, v4l_print_buffer, INFO_FL_QUEUE),
2432 	IOCTL_INFO_STD(VIDIOC_EXPBUF, vidioc_expbuf, v4l_print_exportbuffer, INFO_FL_QUEUE | INFO_FL_CLEAR(v4l2_exportbuffer, flags)),
2433 	IOCTL_INFO_FNC(VIDIOC_DQBUF, v4l_dqbuf, v4l_print_buffer, INFO_FL_QUEUE),
2434 	IOCTL_INFO_FNC(VIDIOC_STREAMON, v4l_streamon, v4l_print_buftype, INFO_FL_PRIO | INFO_FL_QUEUE),
2435 	IOCTL_INFO_FNC(VIDIOC_STREAMOFF, v4l_streamoff, v4l_print_buftype, INFO_FL_PRIO | INFO_FL_QUEUE),
2436 	IOCTL_INFO_FNC(VIDIOC_G_PARM, v4l_g_parm, v4l_print_streamparm, INFO_FL_CLEAR(v4l2_streamparm, type)),
2437 	IOCTL_INFO_FNC(VIDIOC_S_PARM, v4l_s_parm, v4l_print_streamparm, INFO_FL_PRIO),
2438 	IOCTL_INFO_STD(VIDIOC_G_STD, vidioc_g_std, v4l_print_std, 0),
2439 	IOCTL_INFO_FNC(VIDIOC_S_STD, v4l_s_std, v4l_print_std, INFO_FL_PRIO),
2440 	IOCTL_INFO_FNC(VIDIOC_ENUMSTD, v4l_enumstd, v4l_print_standard, INFO_FL_CLEAR(v4l2_standard, index)),
2441 	IOCTL_INFO_FNC(VIDIOC_ENUMINPUT, v4l_enuminput, v4l_print_enuminput, INFO_FL_CLEAR(v4l2_input, index)),
2442 	IOCTL_INFO_FNC(VIDIOC_G_CTRL, v4l_g_ctrl, v4l_print_control, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_control, id)),
2443 	IOCTL_INFO_FNC(VIDIOC_S_CTRL, v4l_s_ctrl, v4l_print_control, INFO_FL_PRIO | INFO_FL_CTRL),
2444 	IOCTL_INFO_FNC(VIDIOC_G_TUNER, v4l_g_tuner, v4l_print_tuner, INFO_FL_CLEAR(v4l2_tuner, index)),
2445 	IOCTL_INFO_FNC(VIDIOC_S_TUNER, v4l_s_tuner, v4l_print_tuner, INFO_FL_PRIO),
2446 	IOCTL_INFO_STD(VIDIOC_G_AUDIO, vidioc_g_audio, v4l_print_audio, 0),
2447 	IOCTL_INFO_STD(VIDIOC_S_AUDIO, vidioc_s_audio, v4l_print_audio, INFO_FL_PRIO),
2448 	IOCTL_INFO_FNC(VIDIOC_QUERYCTRL, v4l_queryctrl, v4l_print_queryctrl, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_queryctrl, id)),
2449 	IOCTL_INFO_FNC(VIDIOC_QUERYMENU, v4l_querymenu, v4l_print_querymenu, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_querymenu, index)),
2450 	IOCTL_INFO_STD(VIDIOC_G_INPUT, vidioc_g_input, v4l_print_u32, 0),
2451 	IOCTL_INFO_FNC(VIDIOC_S_INPUT, v4l_s_input, v4l_print_u32, INFO_FL_PRIO),
2452 	IOCTL_INFO_STD(VIDIOC_G_EDID, vidioc_g_edid, v4l_print_edid, 0),
2453 	IOCTL_INFO_STD(VIDIOC_S_EDID, vidioc_s_edid, v4l_print_edid, INFO_FL_PRIO),
2454 	IOCTL_INFO_STD(VIDIOC_G_OUTPUT, vidioc_g_output, v4l_print_u32, 0),
2455 	IOCTL_INFO_FNC(VIDIOC_S_OUTPUT, v4l_s_output, v4l_print_u32, INFO_FL_PRIO),
2456 	IOCTL_INFO_FNC(VIDIOC_ENUMOUTPUT, v4l_enumoutput, v4l_print_enumoutput, INFO_FL_CLEAR(v4l2_output, index)),
2457 	IOCTL_INFO_STD(VIDIOC_G_AUDOUT, vidioc_g_audout, v4l_print_audioout, 0),
2458 	IOCTL_INFO_STD(VIDIOC_S_AUDOUT, vidioc_s_audout, v4l_print_audioout, INFO_FL_PRIO),
2459 	IOCTL_INFO_FNC(VIDIOC_G_MODULATOR, v4l_g_modulator, v4l_print_modulator, INFO_FL_CLEAR(v4l2_modulator, index)),
2460 	IOCTL_INFO_FNC(VIDIOC_S_MODULATOR, v4l_s_modulator, v4l_print_modulator, INFO_FL_PRIO),
2461 	IOCTL_INFO_FNC(VIDIOC_G_FREQUENCY, v4l_g_frequency, v4l_print_frequency, INFO_FL_CLEAR(v4l2_frequency, tuner)),
2462 	IOCTL_INFO_FNC(VIDIOC_S_FREQUENCY, v4l_s_frequency, v4l_print_frequency, INFO_FL_PRIO),
2463 	IOCTL_INFO_FNC(VIDIOC_CROPCAP, v4l_cropcap, v4l_print_cropcap, INFO_FL_CLEAR(v4l2_cropcap, type)),
2464 	IOCTL_INFO_FNC(VIDIOC_G_CROP, v4l_g_crop, v4l_print_crop, INFO_FL_CLEAR(v4l2_crop, type)),
2465 	IOCTL_INFO_FNC(VIDIOC_S_CROP, v4l_s_crop, v4l_print_crop, INFO_FL_PRIO),
2466 	IOCTL_INFO_STD(VIDIOC_G_SELECTION, vidioc_g_selection, v4l_print_selection, INFO_FL_CLEAR(v4l2_selection, r)),
2467 	IOCTL_INFO_STD(VIDIOC_S_SELECTION, vidioc_s_selection, v4l_print_selection, INFO_FL_PRIO | INFO_FL_CLEAR(v4l2_selection, r)),
2468 	IOCTL_INFO_STD(VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp, v4l_print_jpegcompression, 0),
2469 	IOCTL_INFO_STD(VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp, v4l_print_jpegcompression, INFO_FL_PRIO),
2470 	IOCTL_INFO_FNC(VIDIOC_QUERYSTD, v4l_querystd, v4l_print_std, 0),
2471 	IOCTL_INFO_FNC(VIDIOC_TRY_FMT, v4l_try_fmt, v4l_print_format, 0),
2472 	IOCTL_INFO_STD(VIDIOC_ENUMAUDIO, vidioc_enumaudio, v4l_print_audio, INFO_FL_CLEAR(v4l2_audio, index)),
2473 	IOCTL_INFO_STD(VIDIOC_ENUMAUDOUT, vidioc_enumaudout, v4l_print_audioout, INFO_FL_CLEAR(v4l2_audioout, index)),
2474 	IOCTL_INFO_FNC(VIDIOC_G_PRIORITY, v4l_g_priority, v4l_print_u32, 0),
2475 	IOCTL_INFO_FNC(VIDIOC_S_PRIORITY, v4l_s_priority, v4l_print_u32, INFO_FL_PRIO),
2476 	IOCTL_INFO_FNC(VIDIOC_G_SLICED_VBI_CAP, v4l_g_sliced_vbi_cap, v4l_print_sliced_vbi_cap, INFO_FL_CLEAR(v4l2_sliced_vbi_cap, type)),
2477 	IOCTL_INFO_FNC(VIDIOC_LOG_STATUS, v4l_log_status, v4l_print_newline, 0),
2478 	IOCTL_INFO_FNC(VIDIOC_G_EXT_CTRLS, v4l_g_ext_ctrls, v4l_print_ext_controls, INFO_FL_CTRL),
2479 	IOCTL_INFO_FNC(VIDIOC_S_EXT_CTRLS, v4l_s_ext_ctrls, v4l_print_ext_controls, INFO_FL_PRIO | INFO_FL_CTRL),
2480 	IOCTL_INFO_FNC(VIDIOC_TRY_EXT_CTRLS, v4l_try_ext_ctrls, v4l_print_ext_controls, INFO_FL_CTRL),
2481 	IOCTL_INFO_STD(VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes, v4l_print_frmsizeenum, INFO_FL_CLEAR(v4l2_frmsizeenum, pixel_format)),
2482 	IOCTL_INFO_STD(VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals, v4l_print_frmivalenum, INFO_FL_CLEAR(v4l2_frmivalenum, height)),
2483 	IOCTL_INFO_STD(VIDIOC_G_ENC_INDEX, vidioc_g_enc_index, v4l_print_enc_idx, 0),
2484 	IOCTL_INFO_STD(VIDIOC_ENCODER_CMD, vidioc_encoder_cmd, v4l_print_encoder_cmd, INFO_FL_PRIO | INFO_FL_CLEAR(v4l2_encoder_cmd, flags)),
2485 	IOCTL_INFO_STD(VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd, v4l_print_encoder_cmd, INFO_FL_CLEAR(v4l2_encoder_cmd, flags)),
2486 	IOCTL_INFO_STD(VIDIOC_DECODER_CMD, vidioc_decoder_cmd, v4l_print_decoder_cmd, INFO_FL_PRIO),
2487 	IOCTL_INFO_STD(VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd, v4l_print_decoder_cmd, 0),
2488 	IOCTL_INFO_FNC(VIDIOC_DBG_S_REGISTER, v4l_dbg_s_register, v4l_print_dbg_register, 0),
2489 	IOCTL_INFO_FNC(VIDIOC_DBG_G_REGISTER, v4l_dbg_g_register, v4l_print_dbg_register, 0),
2490 	IOCTL_INFO_FNC(VIDIOC_S_HW_FREQ_SEEK, v4l_s_hw_freq_seek, v4l_print_hw_freq_seek, INFO_FL_PRIO),
2491 	IOCTL_INFO_STD(VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings, v4l_print_dv_timings, INFO_FL_PRIO),
2492 	IOCTL_INFO_STD(VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings, v4l_print_dv_timings, 0),
2493 	IOCTL_INFO_FNC(VIDIOC_DQEVENT, v4l_dqevent, v4l_print_event, 0),
2494 	IOCTL_INFO_FNC(VIDIOC_SUBSCRIBE_EVENT, v4l_subscribe_event, v4l_print_event_subscription, 0),
2495 	IOCTL_INFO_FNC(VIDIOC_UNSUBSCRIBE_EVENT, v4l_unsubscribe_event, v4l_print_event_subscription, 0),
2496 	IOCTL_INFO_FNC(VIDIOC_CREATE_BUFS, v4l_create_bufs, v4l_print_create_buffers, INFO_FL_PRIO | INFO_FL_QUEUE),
2497 	IOCTL_INFO_FNC(VIDIOC_PREPARE_BUF, v4l_prepare_buf, v4l_print_buffer, INFO_FL_QUEUE),
2498 	IOCTL_INFO_STD(VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings, v4l_print_enum_dv_timings, 0),
2499 	IOCTL_INFO_STD(VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings, v4l_print_dv_timings, 0),
2500 	IOCTL_INFO_STD(VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap, v4l_print_dv_timings_cap, INFO_FL_CLEAR(v4l2_dv_timings_cap, type)),
2501 	IOCTL_INFO_FNC(VIDIOC_ENUM_FREQ_BANDS, v4l_enum_freq_bands, v4l_print_freq_band, 0),
2502 	IOCTL_INFO_FNC(VIDIOC_DBG_G_CHIP_INFO, v4l_dbg_g_chip_info, v4l_print_dbg_chip_info, INFO_FL_CLEAR(v4l2_dbg_chip_info, match)),
2503 	IOCTL_INFO_FNC(VIDIOC_QUERY_EXT_CTRL, v4l_query_ext_ctrl, v4l_print_query_ext_ctrl, INFO_FL_CTRL | INFO_FL_CLEAR(v4l2_query_ext_ctrl, id)),
2504 };
2505 #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
2506 
2507 bool v4l2_is_known_ioctl(unsigned int cmd)
2508 {
2509 	if (_IOC_NR(cmd) >= V4L2_IOCTLS)
2510 		return false;
2511 	return v4l2_ioctls[_IOC_NR(cmd)].ioctl == cmd;
2512 }
2513 
2514 struct mutex *v4l2_ioctl_get_lock(struct video_device *vdev, unsigned cmd)
2515 {
2516 	if (_IOC_NR(cmd) >= V4L2_IOCTLS)
2517 		return vdev->lock;
2518 	if (test_bit(_IOC_NR(cmd), vdev->disable_locking))
2519 		return NULL;
2520 	if (vdev->queue && vdev->queue->lock &&
2521 			(v4l2_ioctls[_IOC_NR(cmd)].flags & INFO_FL_QUEUE))
2522 		return vdev->queue->lock;
2523 	return vdev->lock;
2524 }
2525 
2526 /* Common ioctl debug function. This function can be used by
2527    external ioctl messages as well as internal V4L ioctl */
2528 void v4l_printk_ioctl(const char *prefix, unsigned int cmd)
2529 {
2530 	const char *dir, *type;
2531 
2532 	if (prefix)
2533 		printk(KERN_DEBUG "%s: ", prefix);
2534 
2535 	switch (_IOC_TYPE(cmd)) {
2536 	case 'd':
2537 		type = "v4l2_int";
2538 		break;
2539 	case 'V':
2540 		if (_IOC_NR(cmd) >= V4L2_IOCTLS) {
2541 			type = "v4l2";
2542 			break;
2543 		}
2544 		pr_cont("%s", v4l2_ioctls[_IOC_NR(cmd)].name);
2545 		return;
2546 	default:
2547 		type = "unknown";
2548 		break;
2549 	}
2550 
2551 	switch (_IOC_DIR(cmd)) {
2552 	case _IOC_NONE:              dir = "--"; break;
2553 	case _IOC_READ:              dir = "r-"; break;
2554 	case _IOC_WRITE:             dir = "-w"; break;
2555 	case _IOC_READ | _IOC_WRITE: dir = "rw"; break;
2556 	default:                     dir = "*ERR*"; break;
2557 	}
2558 	pr_cont("%s ioctl '%c', dir=%s, #%d (0x%08x)",
2559 		type, _IOC_TYPE(cmd), dir, _IOC_NR(cmd), cmd);
2560 }
2561 EXPORT_SYMBOL(v4l_printk_ioctl);
2562 
2563 static long __video_do_ioctl(struct file *file,
2564 		unsigned int cmd, void *arg)
2565 {
2566 	struct video_device *vfd = video_devdata(file);
2567 	const struct v4l2_ioctl_ops *ops = vfd->ioctl_ops;
2568 	bool write_only = false;
2569 	struct v4l2_ioctl_info default_info;
2570 	const struct v4l2_ioctl_info *info;
2571 	void *fh = file->private_data;
2572 	struct v4l2_fh *vfh = NULL;
2573 	int dev_debug = vfd->dev_debug;
2574 	long ret = -ENOTTY;
2575 
2576 	if (ops == NULL) {
2577 		pr_warn("%s: has no ioctl_ops.\n",
2578 				video_device_node_name(vfd));
2579 		return ret;
2580 	}
2581 
2582 	if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags))
2583 		vfh = file->private_data;
2584 
2585 	if (v4l2_is_known_ioctl(cmd)) {
2586 		info = &v4l2_ioctls[_IOC_NR(cmd)];
2587 
2588 		if (!test_bit(_IOC_NR(cmd), vfd->valid_ioctls) &&
2589 		    !((info->flags & INFO_FL_CTRL) && vfh && vfh->ctrl_handler))
2590 			goto done;
2591 
2592 		if (vfh && (info->flags & INFO_FL_PRIO)) {
2593 			ret = v4l2_prio_check(vfd->prio, vfh->prio);
2594 			if (ret)
2595 				goto done;
2596 		}
2597 	} else {
2598 		default_info.ioctl = cmd;
2599 		default_info.flags = 0;
2600 		default_info.debug = v4l_print_default;
2601 		info = &default_info;
2602 	}
2603 
2604 	write_only = _IOC_DIR(cmd) == _IOC_WRITE;
2605 	if (info->flags & INFO_FL_STD) {
2606 		typedef int (*vidioc_op)(struct file *file, void *fh, void *p);
2607 		const void *p = vfd->ioctl_ops;
2608 		const vidioc_op *vidioc = p + info->u.offset;
2609 
2610 		ret = (*vidioc)(file, fh, arg);
2611 	} else if (info->flags & INFO_FL_FUNC) {
2612 		ret = info->u.func(ops, file, fh, arg);
2613 	} else if (!ops->vidioc_default) {
2614 		ret = -ENOTTY;
2615 	} else {
2616 		ret = ops->vidioc_default(file, fh,
2617 			vfh ? v4l2_prio_check(vfd->prio, vfh->prio) >= 0 : 0,
2618 			cmd, arg);
2619 	}
2620 
2621 done:
2622 	if (dev_debug & (V4L2_DEV_DEBUG_IOCTL | V4L2_DEV_DEBUG_IOCTL_ARG)) {
2623 		if (!(dev_debug & V4L2_DEV_DEBUG_STREAMING) &&
2624 		    (cmd == VIDIOC_QBUF || cmd == VIDIOC_DQBUF))
2625 			return ret;
2626 
2627 		v4l_printk_ioctl(video_device_node_name(vfd), cmd);
2628 		if (ret < 0)
2629 			pr_cont(": error %ld", ret);
2630 		if (!(dev_debug & V4L2_DEV_DEBUG_IOCTL_ARG))
2631 			pr_cont("\n");
2632 		else if (_IOC_DIR(cmd) == _IOC_NONE)
2633 			info->debug(arg, write_only);
2634 		else {
2635 			pr_cont(": ");
2636 			info->debug(arg, write_only);
2637 		}
2638 	}
2639 
2640 	return ret;
2641 }
2642 
2643 static int check_array_args(unsigned int cmd, void *parg, size_t *array_size,
2644 			    void __user **user_ptr, void ***kernel_ptr)
2645 {
2646 	int ret = 0;
2647 
2648 	switch (cmd) {
2649 	case VIDIOC_PREPARE_BUF:
2650 	case VIDIOC_QUERYBUF:
2651 	case VIDIOC_QBUF:
2652 	case VIDIOC_DQBUF: {
2653 		struct v4l2_buffer *buf = parg;
2654 
2655 		if (V4L2_TYPE_IS_MULTIPLANAR(buf->type) && buf->length > 0) {
2656 			if (buf->length > VIDEO_MAX_PLANES) {
2657 				ret = -EINVAL;
2658 				break;
2659 			}
2660 			*user_ptr = (void __user *)buf->m.planes;
2661 			*kernel_ptr = (void **)&buf->m.planes;
2662 			*array_size = sizeof(struct v4l2_plane) * buf->length;
2663 			ret = 1;
2664 		}
2665 		break;
2666 	}
2667 
2668 	case VIDIOC_G_EDID:
2669 	case VIDIOC_S_EDID: {
2670 		struct v4l2_edid *edid = parg;
2671 
2672 		if (edid->blocks) {
2673 			if (edid->blocks > 256) {
2674 				ret = -EINVAL;
2675 				break;
2676 			}
2677 			*user_ptr = (void __user *)edid->edid;
2678 			*kernel_ptr = (void **)&edid->edid;
2679 			*array_size = edid->blocks * 128;
2680 			ret = 1;
2681 		}
2682 		break;
2683 	}
2684 
2685 	case VIDIOC_S_EXT_CTRLS:
2686 	case VIDIOC_G_EXT_CTRLS:
2687 	case VIDIOC_TRY_EXT_CTRLS: {
2688 		struct v4l2_ext_controls *ctrls = parg;
2689 
2690 		if (ctrls->count != 0) {
2691 			if (ctrls->count > V4L2_CID_MAX_CTRLS) {
2692 				ret = -EINVAL;
2693 				break;
2694 			}
2695 			*user_ptr = (void __user *)ctrls->controls;
2696 			*kernel_ptr = (void **)&ctrls->controls;
2697 			*array_size = sizeof(struct v4l2_ext_control)
2698 				    * ctrls->count;
2699 			ret = 1;
2700 		}
2701 		break;
2702 	}
2703 	}
2704 
2705 	return ret;
2706 }
2707 
2708 long
2709 video_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
2710 	       v4l2_kioctl func)
2711 {
2712 	char	sbuf[128];
2713 	void    *mbuf = NULL;
2714 	void	*parg = (void *)arg;
2715 	long	err  = -EINVAL;
2716 	bool	has_array_args;
2717 	size_t  array_size = 0;
2718 	void __user *user_ptr = NULL;
2719 	void	**kernel_ptr = NULL;
2720 
2721 	/*  Copy arguments into temp kernel buffer  */
2722 	if (_IOC_DIR(cmd) != _IOC_NONE) {
2723 		if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
2724 			parg = sbuf;
2725 		} else {
2726 			/* too big to allocate from stack */
2727 			mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
2728 			if (NULL == mbuf)
2729 				return -ENOMEM;
2730 			parg = mbuf;
2731 		}
2732 
2733 		err = -EFAULT;
2734 		if (_IOC_DIR(cmd) & _IOC_WRITE) {
2735 			unsigned int n = _IOC_SIZE(cmd);
2736 
2737 			/*
2738 			 * In some cases, only a few fields are used as input,
2739 			 * i.e. when the app sets "index" and then the driver
2740 			 * fills in the rest of the structure for the thing
2741 			 * with that index.  We only need to copy up the first
2742 			 * non-input field.
2743 			 */
2744 			if (v4l2_is_known_ioctl(cmd)) {
2745 				u32 flags = v4l2_ioctls[_IOC_NR(cmd)].flags;
2746 				if (flags & INFO_FL_CLEAR_MASK)
2747 					n = (flags & INFO_FL_CLEAR_MASK) >> 16;
2748 			}
2749 
2750 			if (copy_from_user(parg, (void __user *)arg, n))
2751 				goto out;
2752 
2753 			/* zero out anything we don't copy from userspace */
2754 			if (n < _IOC_SIZE(cmd))
2755 				memset((u8 *)parg + n, 0, _IOC_SIZE(cmd) - n);
2756 		} else {
2757 			/* read-only ioctl */
2758 			memset(parg, 0, _IOC_SIZE(cmd));
2759 		}
2760 	}
2761 
2762 	err = check_array_args(cmd, parg, &array_size, &user_ptr, &kernel_ptr);
2763 	if (err < 0)
2764 		goto out;
2765 	has_array_args = err;
2766 
2767 	if (has_array_args) {
2768 		/*
2769 		 * When adding new types of array args, make sure that the
2770 		 * parent argument to ioctl (which contains the pointer to the
2771 		 * array) fits into sbuf (so that mbuf will still remain
2772 		 * unused up to here).
2773 		 */
2774 		mbuf = kmalloc(array_size, GFP_KERNEL);
2775 		err = -ENOMEM;
2776 		if (NULL == mbuf)
2777 			goto out_array_args;
2778 		err = -EFAULT;
2779 		if (copy_from_user(mbuf, user_ptr, array_size))
2780 			goto out_array_args;
2781 		*kernel_ptr = mbuf;
2782 	}
2783 
2784 	/* Handles IOCTL */
2785 	err = func(file, cmd, parg);
2786 	if (err == -ENOIOCTLCMD)
2787 		err = -ENOTTY;
2788 	if (err == 0) {
2789 		if (cmd == VIDIOC_DQBUF)
2790 			trace_v4l2_dqbuf(video_devdata(file)->minor, parg);
2791 		else if (cmd == VIDIOC_QBUF)
2792 			trace_v4l2_qbuf(video_devdata(file)->minor, parg);
2793 	}
2794 
2795 	if (has_array_args) {
2796 		*kernel_ptr = (void __force *)user_ptr;
2797 		if (copy_to_user(user_ptr, mbuf, array_size))
2798 			err = -EFAULT;
2799 		goto out_array_args;
2800 	}
2801 	/* VIDIOC_QUERY_DV_TIMINGS can return an error, but still have valid
2802 	   results that must be returned. */
2803 	if (err < 0 && cmd != VIDIOC_QUERY_DV_TIMINGS)
2804 		goto out;
2805 
2806 out_array_args:
2807 	/*  Copy results into user buffer  */
2808 	switch (_IOC_DIR(cmd)) {
2809 	case _IOC_READ:
2810 	case (_IOC_WRITE | _IOC_READ):
2811 		if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
2812 			err = -EFAULT;
2813 		break;
2814 	}
2815 
2816 out:
2817 	kfree(mbuf);
2818 	return err;
2819 }
2820 EXPORT_SYMBOL(video_usercopy);
2821 
2822 long video_ioctl2(struct file *file,
2823 	       unsigned int cmd, unsigned long arg)
2824 {
2825 	return video_usercopy(file, cmd, arg, __video_do_ioctl);
2826 }
2827 EXPORT_SYMBOL(video_ioctl2);
2828