Linux/drivers/media/video/v4l2-ioctl.c

  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/v4l2-chip-ident.h>
 30 
 31 #define dbgarg(cmd, fmt, arg...) \
 32                 do {                                                    \
 33                     if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {            \
 34                         printk(KERN_DEBUG "%s: ",  vfd->name);          \
 35                         v4l_printk_ioctl(cmd);                          \
 36                         printk(" " fmt,  ## arg);                       \
 37                     }                                                   \
 38                 } while (0)
 39 
 40 #define dbgarg2(fmt, arg...) \
 41                 do {                                                    \
 42                     if (vfd->debug & V4L2_DEBUG_IOCTL_ARG)              \
 43                         printk(KERN_DEBUG "%s: " fmt, vfd->name, ## arg);\
 44                 } while (0)
 45 
 46 #define dbgarg3(fmt, arg...) \
 47                 do {                                                    \
 48                     if (vfd->debug & V4L2_DEBUG_IOCTL_ARG)              \
 49                         printk(KERN_CONT "%s: " fmt, vfd->name, ## arg);\
 50                 } while (0)
 51 
 52 /* Zero out the end of the struct pointed to by p.  Everything after, but
 53  * not including, the specified field is cleared. */
 54 #define CLEAR_AFTER_FIELD(p, field) \
 55         memset((u8 *)(p) + offsetof(typeof(*(p)), field) + sizeof((p)->field), \
 56         0, sizeof(*(p)) - offsetof(typeof(*(p)), field) - sizeof((p)->field))
 57 
 58 #define have_fmt_ops(foo) (                                             \
 59         ops->vidioc_##foo##_fmt_vid_cap ||                              \
 60         ops->vidioc_##foo##_fmt_vid_out ||                              \
 61         ops->vidioc_##foo##_fmt_vid_cap_mplane ||                       \
 62         ops->vidioc_##foo##_fmt_vid_out_mplane ||                       \
 63         ops->vidioc_##foo##_fmt_vid_overlay ||                          \
 64         ops->vidioc_##foo##_fmt_vbi_cap ||                              \
 65         ops->vidioc_##foo##_fmt_vid_out_overlay ||                      \
 66         ops->vidioc_##foo##_fmt_vbi_out ||                              \
 67         ops->vidioc_##foo##_fmt_sliced_vbi_cap ||                       \
 68         ops->vidioc_##foo##_fmt_sliced_vbi_out ||                       \
 69         ops->vidioc_##foo##_fmt_type_private)
 70 
 71 struct std_descr {
 72         v4l2_std_id std;
 73         const char *descr;
 74 };
 75 
 76 static const struct std_descr standards[] = {
 77         { V4L2_STD_NTSC,        "NTSC"      },
 78         { V4L2_STD_NTSC_M,      "NTSC-M"    },
 79         { V4L2_STD_NTSC_M_JP,   "NTSC-M-JP" },
 80         { V4L2_STD_NTSC_M_KR,   "NTSC-M-KR" },
 81         { V4L2_STD_NTSC_443,    "NTSC-443"  },
 82         { V4L2_STD_PAL,         "PAL"       },
 83         { V4L2_STD_PAL_BG,      "PAL-BG"    },
 84         { V4L2_STD_PAL_B,       "PAL-B"     },
 85         { V4L2_STD_PAL_B1,      "PAL-B1"    },
 86         { V4L2_STD_PAL_G,       "PAL-G"     },
 87         { V4L2_STD_PAL_H,       "PAL-H"     },
 88         { V4L2_STD_PAL_I,       "PAL-I"     },
 89         { V4L2_STD_PAL_DK,      "PAL-DK"    },
 90         { V4L2_STD_PAL_D,       "PAL-D"     },
 91         { V4L2_STD_PAL_D1,      "PAL-D1"    },
 92         { V4L2_STD_PAL_K,       "PAL-K"     },
 93         { V4L2_STD_PAL_M,       "PAL-M"     },
 94         { V4L2_STD_PAL_N,       "PAL-N"     },
 95         { V4L2_STD_PAL_Nc,      "PAL-Nc"    },
 96         { V4L2_STD_PAL_60,      "PAL-60"    },
 97         { V4L2_STD_SECAM,       "SECAM"     },
 98         { V4L2_STD_SECAM_B,     "SECAM-B"   },
 99         { V4L2_STD_SECAM_G,     "SECAM-G"   },
100         { V4L2_STD_SECAM_H,     "SECAM-H"   },
101         { V4L2_STD_SECAM_DK,    "SECAM-DK"  },
102         { V4L2_STD_SECAM_D,     "SECAM-D"   },
103         { V4L2_STD_SECAM_K,     "SECAM-K"   },
104         { V4L2_STD_SECAM_K1,    "SECAM-K1"  },
105         { V4L2_STD_SECAM_L,     "SECAM-L"   },
106         { V4L2_STD_SECAM_LC,    "SECAM-Lc"  },
107         { 0,                    "Unknown"   }
108 };
109 
110 /* video4linux standard ID conversion to standard name
111  */
112 const char *v4l2_norm_to_name(v4l2_std_id id)
113 {
114         u32 myid = id;
115         int i;
116 
117         /* HACK: ppc32 architecture doesn't have __ucmpdi2 function to handle
118            64 bit comparations. So, on that architecture, with some gcc
119            variants, compilation fails. Currently, the max value is 30bit wide.
120          */
121         BUG_ON(myid != id);
122 
123         for (i = 0; standards[i].std; i++)
124                 if (myid == standards[i].std)
125                         break;
126         return standards[i].descr;
127 }
128 EXPORT_SYMBOL(v4l2_norm_to_name);
129 
130 /* Returns frame period for the given standard */
131 void v4l2_video_std_frame_period(int id, struct v4l2_fract *frameperiod)
132 {
133         if (id & V4L2_STD_525_60) {
134                 frameperiod->numerator = 1001;
135                 frameperiod->denominator = 30000;
136         } else {
137                 frameperiod->numerator = 1;
138                 frameperiod->denominator = 25;
139         }
140 }
141 EXPORT_SYMBOL(v4l2_video_std_frame_period);
142 
143 /* Fill in the fields of a v4l2_standard structure according to the
144    'id' and 'transmission' parameters.  Returns negative on error.  */
145 int v4l2_video_std_construct(struct v4l2_standard *vs,
146                              int id, const char *name)
147 {
148         vs->id = id;
149         v4l2_video_std_frame_period(id, &vs->frameperiod);
150         vs->framelines = (id & V4L2_STD_525_60) ? 525 : 625;
151         strlcpy(vs->name, name, sizeof(vs->name));
152         return 0;
153 }
154 EXPORT_SYMBOL(v4l2_video_std_construct);
155 
156 /* ----------------------------------------------------------------- */
157 /* some arrays for pretty-printing debug messages of enum types      */
158 
159 const char *v4l2_field_names[] = {
160         [V4L2_FIELD_ANY]        = "any",
161         [V4L2_FIELD_NONE]       = "none",
162         [V4L2_FIELD_TOP]        = "top",
163         [V4L2_FIELD_BOTTOM]     = "bottom",
164         [V4L2_FIELD_INTERLACED] = "interlaced",
165         [V4L2_FIELD_SEQ_TB]     = "seq-tb",
166         [V4L2_FIELD_SEQ_BT]     = "seq-bt",
167         [V4L2_FIELD_ALTERNATE]  = "alternate",
168         [V4L2_FIELD_INTERLACED_TB] = "interlaced-tb",
169         [V4L2_FIELD_INTERLACED_BT] = "interlaced-bt",
170 };
171 EXPORT_SYMBOL(v4l2_field_names);
172 
173 const char *v4l2_type_names[] = {
174         [V4L2_BUF_TYPE_VIDEO_CAPTURE]      = "vid-cap",
175         [V4L2_BUF_TYPE_VIDEO_OVERLAY]      = "vid-overlay",
176         [V4L2_BUF_TYPE_VIDEO_OUTPUT]       = "vid-out",
177         [V4L2_BUF_TYPE_VBI_CAPTURE]        = "vbi-cap",
178         [V4L2_BUF_TYPE_VBI_OUTPUT]         = "vbi-out",
179         [V4L2_BUF_TYPE_SLICED_VBI_CAPTURE] = "sliced-vbi-cap",
180         [V4L2_BUF_TYPE_SLICED_VBI_OUTPUT]  = "sliced-vbi-out",
181         [V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY] = "vid-out-overlay",
182         [V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE] = "vid-cap-mplane",
183         [V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE] = "vid-out-mplane",
184 };
185 EXPORT_SYMBOL(v4l2_type_names);
186 
187 static const char *v4l2_memory_names[] = {
188         [V4L2_MEMORY_MMAP]    = "mmap",
189         [V4L2_MEMORY_USERPTR] = "userptr",
190         [V4L2_MEMORY_OVERLAY] = "overlay",
191 };
192 
193 #define prt_names(a, arr) ((((a) >= 0) && ((a) < ARRAY_SIZE(arr))) ? \
194                            arr[a] : "unknown")
195 
196 /* ------------------------------------------------------------------ */
197 /* debug help functions                                               */
198 static const char *v4l2_ioctls[] = {
199         [_IOC_NR(VIDIOC_QUERYCAP)]         = "VIDIOC_QUERYCAP",
200         [_IOC_NR(VIDIOC_RESERVED)]         = "VIDIOC_RESERVED",
201         [_IOC_NR(VIDIOC_ENUM_FMT)]         = "VIDIOC_ENUM_FMT",
202         [_IOC_NR(VIDIOC_G_FMT)]            = "VIDIOC_G_FMT",
203         [_IOC_NR(VIDIOC_S_FMT)]            = "VIDIOC_S_FMT",
204         [_IOC_NR(VIDIOC_REQBUFS)]          = "VIDIOC_REQBUFS",
205         [_IOC_NR(VIDIOC_QUERYBUF)]         = "VIDIOC_QUERYBUF",
206         [_IOC_NR(VIDIOC_G_FBUF)]           = "VIDIOC_G_FBUF",
207         [_IOC_NR(VIDIOC_S_FBUF)]           = "VIDIOC_S_FBUF",
208         [_IOC_NR(VIDIOC_OVERLAY)]          = "VIDIOC_OVERLAY",
209         [_IOC_NR(VIDIOC_QBUF)]             = "VIDIOC_QBUF",
210         [_IOC_NR(VIDIOC_DQBUF)]            = "VIDIOC_DQBUF",
211         [_IOC_NR(VIDIOC_STREAMON)]         = "VIDIOC_STREAMON",
212         [_IOC_NR(VIDIOC_STREAMOFF)]        = "VIDIOC_STREAMOFF",
213         [_IOC_NR(VIDIOC_G_PARM)]           = "VIDIOC_G_PARM",
214         [_IOC_NR(VIDIOC_S_PARM)]           = "VIDIOC_S_PARM",
215         [_IOC_NR(VIDIOC_G_STD)]            = "VIDIOC_G_STD",
216         [_IOC_NR(VIDIOC_S_STD)]            = "VIDIOC_S_STD",
217         [_IOC_NR(VIDIOC_ENUMSTD)]          = "VIDIOC_ENUMSTD",
218         [_IOC_NR(VIDIOC_ENUMINPUT)]        = "VIDIOC_ENUMINPUT",
219         [_IOC_NR(VIDIOC_G_CTRL)]           = "VIDIOC_G_CTRL",
220         [_IOC_NR(VIDIOC_S_CTRL)]           = "VIDIOC_S_CTRL",
221         [_IOC_NR(VIDIOC_G_TUNER)]          = "VIDIOC_G_TUNER",
222         [_IOC_NR(VIDIOC_S_TUNER)]          = "VIDIOC_S_TUNER",
223         [_IOC_NR(VIDIOC_G_AUDIO)]          = "VIDIOC_G_AUDIO",
224         [_IOC_NR(VIDIOC_S_AUDIO)]          = "VIDIOC_S_AUDIO",
225         [_IOC_NR(VIDIOC_QUERYCTRL)]        = "VIDIOC_QUERYCTRL",
226         [_IOC_NR(VIDIOC_QUERYMENU)]        = "VIDIOC_QUERYMENU",
227         [_IOC_NR(VIDIOC_G_INPUT)]          = "VIDIOC_G_INPUT",
228         [_IOC_NR(VIDIOC_S_INPUT)]          = "VIDIOC_S_INPUT",
229         [_IOC_NR(VIDIOC_G_OUTPUT)]         = "VIDIOC_G_OUTPUT",
230         [_IOC_NR(VIDIOC_S_OUTPUT)]         = "VIDIOC_S_OUTPUT",
231         [_IOC_NR(VIDIOC_ENUMOUTPUT)]       = "VIDIOC_ENUMOUTPUT",
232         [_IOC_NR(VIDIOC_G_AUDOUT)]         = "VIDIOC_G_AUDOUT",
233         [_IOC_NR(VIDIOC_S_AUDOUT)]         = "VIDIOC_S_AUDOUT",
234         [_IOC_NR(VIDIOC_G_MODULATOR)]      = "VIDIOC_G_MODULATOR",
235         [_IOC_NR(VIDIOC_S_MODULATOR)]      = "VIDIOC_S_MODULATOR",
236         [_IOC_NR(VIDIOC_G_FREQUENCY)]      = "VIDIOC_G_FREQUENCY",
237         [_IOC_NR(VIDIOC_S_FREQUENCY)]      = "VIDIOC_S_FREQUENCY",
238         [_IOC_NR(VIDIOC_CROPCAP)]          = "VIDIOC_CROPCAP",
239         [_IOC_NR(VIDIOC_G_CROP)]           = "VIDIOC_G_CROP",
240         [_IOC_NR(VIDIOC_S_CROP)]           = "VIDIOC_S_CROP",
241         [_IOC_NR(VIDIOC_G_JPEGCOMP)]       = "VIDIOC_G_JPEGCOMP",
242         [_IOC_NR(VIDIOC_S_JPEGCOMP)]       = "VIDIOC_S_JPEGCOMP",
243         [_IOC_NR(VIDIOC_QUERYSTD)]         = "VIDIOC_QUERYSTD",
244         [_IOC_NR(VIDIOC_TRY_FMT)]          = "VIDIOC_TRY_FMT",
245         [_IOC_NR(VIDIOC_ENUMAUDIO)]        = "VIDIOC_ENUMAUDIO",
246         [_IOC_NR(VIDIOC_ENUMAUDOUT)]       = "VIDIOC_ENUMAUDOUT",
247         [_IOC_NR(VIDIOC_G_PRIORITY)]       = "VIDIOC_G_PRIORITY",
248         [_IOC_NR(VIDIOC_S_PRIORITY)]       = "VIDIOC_S_PRIORITY",
249         [_IOC_NR(VIDIOC_G_SLICED_VBI_CAP)] = "VIDIOC_G_SLICED_VBI_CAP",
250         [_IOC_NR(VIDIOC_LOG_STATUS)]       = "VIDIOC_LOG_STATUS",
251         [_IOC_NR(VIDIOC_G_EXT_CTRLS)]      = "VIDIOC_G_EXT_CTRLS",
252         [_IOC_NR(VIDIOC_S_EXT_CTRLS)]      = "VIDIOC_S_EXT_CTRLS",
253         [_IOC_NR(VIDIOC_TRY_EXT_CTRLS)]    = "VIDIOC_TRY_EXT_CTRLS",
254 #if 1
255         [_IOC_NR(VIDIOC_ENUM_FRAMESIZES)]  = "VIDIOC_ENUM_FRAMESIZES",
256         [_IOC_NR(VIDIOC_ENUM_FRAMEINTERVALS)] = "VIDIOC_ENUM_FRAMEINTERVALS",
257         [_IOC_NR(VIDIOC_G_ENC_INDEX)]      = "VIDIOC_G_ENC_INDEX",
258         [_IOC_NR(VIDIOC_ENCODER_CMD)]      = "VIDIOC_ENCODER_CMD",
259         [_IOC_NR(VIDIOC_TRY_ENCODER_CMD)]  = "VIDIOC_TRY_ENCODER_CMD",
260 
261         [_IOC_NR(VIDIOC_DBG_S_REGISTER)]   = "VIDIOC_DBG_S_REGISTER",
262         [_IOC_NR(VIDIOC_DBG_G_REGISTER)]   = "VIDIOC_DBG_G_REGISTER",
263 
264         [_IOC_NR(VIDIOC_DBG_G_CHIP_IDENT)] = "VIDIOC_DBG_G_CHIP_IDENT",
265         [_IOC_NR(VIDIOC_S_HW_FREQ_SEEK)]   = "VIDIOC_S_HW_FREQ_SEEK",
266 #endif
267         [_IOC_NR(VIDIOC_ENUM_DV_PRESETS)]  = "VIDIOC_ENUM_DV_PRESETS",
268         [_IOC_NR(VIDIOC_S_DV_PRESET)]      = "VIDIOC_S_DV_PRESET",
269         [_IOC_NR(VIDIOC_G_DV_PRESET)]      = "VIDIOC_G_DV_PRESET",
270         [_IOC_NR(VIDIOC_QUERY_DV_PRESET)]  = "VIDIOC_QUERY_DV_PRESET",
271         [_IOC_NR(VIDIOC_S_DV_TIMINGS)]     = "VIDIOC_S_DV_TIMINGS",
272         [_IOC_NR(VIDIOC_G_DV_TIMINGS)]     = "VIDIOC_G_DV_TIMINGS",
273         [_IOC_NR(VIDIOC_DQEVENT)]          = "VIDIOC_DQEVENT",
274         [_IOC_NR(VIDIOC_SUBSCRIBE_EVENT)]  = "VIDIOC_SUBSCRIBE_EVENT",
275         [_IOC_NR(VIDIOC_UNSUBSCRIBE_EVENT)] = "VIDIOC_UNSUBSCRIBE_EVENT",
276         [_IOC_NR(VIDIOC_CREATE_BUFS)]      = "VIDIOC_CREATE_BUFS",
277         [_IOC_NR(VIDIOC_PREPARE_BUF)]      = "VIDIOC_PREPARE_BUF",
278 };
279 #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
280 
281 /* Common ioctl debug function. This function can be used by
282    external ioctl messages as well as internal V4L ioctl */
283 void v4l_printk_ioctl(unsigned int cmd)
284 {
285         char *dir, *type;
286 
287         switch (_IOC_TYPE(cmd)) {
288         case 'd':
289                 type = "v4l2_int";
290                 break;
291         case 'V':
292                 if (_IOC_NR(cmd) >= V4L2_IOCTLS) {
293                         type = "v4l2";
294                         break;
295                 }
296                 printk("%s", v4l2_ioctls[_IOC_NR(cmd)]);
297                 return;
298         default:
299                 type = "unknown";
300         }
301 
302         switch (_IOC_DIR(cmd)) {
303         case _IOC_NONE:              dir = "--"; break;
304         case _IOC_READ:              dir = "r-"; break;
305         case _IOC_WRITE:             dir = "-w"; break;
306         case _IOC_READ | _IOC_WRITE: dir = "rw"; break;
307         default:                     dir = "*ERR*"; break;
308         }
309         printk("%s ioctl '%c', dir=%s, #%d (0x%08x)",
310                 type, _IOC_TYPE(cmd), dir, _IOC_NR(cmd), cmd);
311 }
312 EXPORT_SYMBOL(v4l_printk_ioctl);
313 
314 static void dbgbuf(unsigned int cmd, struct video_device *vfd,
315                                         struct v4l2_buffer *p)
316 {
317         struct v4l2_timecode *tc = &p->timecode;
318         struct v4l2_plane *plane;
319         int i;
320 
321         dbgarg(cmd, "%02ld:%02d:%02d.%08ld index=%d, type=%s, "
322                 "flags=0x%08d, field=%0d, sequence=%d, memory=%s\n",
323                         p->timestamp.tv_sec / 3600,
324                         (int)(p->timestamp.tv_sec / 60) % 60,
325                         (int)(p->timestamp.tv_sec % 60),
326                         (long)p->timestamp.tv_usec,
327                         p->index,
328                         prt_names(p->type, v4l2_type_names),
329                         p->flags, p->field, p->sequence,
330                         prt_names(p->memory, v4l2_memory_names));
331 
332         if (V4L2_TYPE_IS_MULTIPLANAR(p->type) && p->m.planes) {
333                 for (i = 0; i < p->length; ++i) {
334                         plane = &p->m.planes[i];
335                         dbgarg2("plane %d: bytesused=%d, data_offset=0x%08x "
336                                 "offset/userptr=0x%08lx, length=%d\n",
337                                 i, plane->bytesused, plane->data_offset,
338                                 plane->m.userptr, plane->length);
339                 }
340         } else {
341                 dbgarg2("bytesused=%d, offset/userptr=0x%08lx, length=%d\n",
342                         p->bytesused, p->m.userptr, p->length);
343         }
344 
345         dbgarg2("timecode=%02d:%02d:%02d type=%d, "
346                 "flags=0x%08d, frames=%d, userbits=0x%08x\n",
347                         tc->hours, tc->minutes, tc->seconds,
348                         tc->type, tc->flags, tc->frames, *(__u32 *)tc->userbits);
349 }
350 
351 static inline void dbgrect(struct video_device *vfd, char *s,
352                                                         struct v4l2_rect *r)
353 {
354         dbgarg2("%sRect start at %dx%d, size=%dx%d\n", s, r->left, r->top,
355                                                 r->width, r->height);
356 };
357 
358 static inline void v4l_print_pix_fmt(struct video_device *vfd,
359                                                 struct v4l2_pix_format *fmt)
360 {
361         dbgarg2("width=%d, height=%d, format=%c%c%c%c, field=%s, "
362                 "bytesperline=%d sizeimage=%d, colorspace=%d\n",
363                 fmt->width, fmt->height,
364                 (fmt->pixelformat & 0xff),
365                 (fmt->pixelformat >>  8) & 0xff,
366                 (fmt->pixelformat >> 16) & 0xff,
367                 (fmt->pixelformat >> 24) & 0xff,
368                 prt_names(fmt->field, v4l2_field_names),
369                 fmt->bytesperline, fmt->sizeimage, fmt->colorspace);
370 };
371 
372 static inline void v4l_print_pix_fmt_mplane(struct video_device *vfd,
373                                             struct v4l2_pix_format_mplane *fmt)
374 {
375         int i;
376 
377         dbgarg2("width=%d, height=%d, format=%c%c%c%c, field=%s, "
378                 "colorspace=%d, num_planes=%d\n",
379                 fmt->width, fmt->height,
380                 (fmt->pixelformat & 0xff),
381                 (fmt->pixelformat >>  8) & 0xff,
382                 (fmt->pixelformat >> 16) & 0xff,
383                 (fmt->pixelformat >> 24) & 0xff,
384                 prt_names(fmt->field, v4l2_field_names),
385                 fmt->colorspace, fmt->num_planes);
386 
387         for (i = 0; i < fmt->num_planes; ++i)
388                 dbgarg2("plane %d: bytesperline=%d sizeimage=%d\n", i,
389                         fmt->plane_fmt[i].bytesperline,
390                         fmt->plane_fmt[i].sizeimage);
391 }
392 
393 static inline void v4l_print_ext_ctrls(unsigned int cmd,
394         struct video_device *vfd, struct v4l2_ext_controls *c, int show_vals)
395 {
396         __u32 i;
397 
398         if (!(vfd->debug & V4L2_DEBUG_IOCTL_ARG))
399                 return;
400         dbgarg(cmd, "");
401         printk(KERN_CONT "class=0x%x", c->ctrl_class);
402         for (i = 0; i < c->count; i++) {
403                 if (show_vals && !c->controls[i].size)
404                         printk(KERN_CONT " id/val=0x%x/0x%x",
405                                 c->controls[i].id, c->controls[i].value);
406                 else
407                         printk(KERN_CONT " id=0x%x,size=%u",
408                                 c->controls[i].id, c->controls[i].size);
409         }
410         printk(KERN_CONT "\n");
411 };
412 
413 static inline int check_ext_ctrls(struct v4l2_ext_controls *c, int allow_priv)
414 {
415         __u32 i;
416 
417         /* zero the reserved fields */
418         c->reserved[0] = c->reserved[1] = 0;
419         for (i = 0; i < c->count; i++)
420                 c->controls[i].reserved2[0] = 0;
421 
422         /* V4L2_CID_PRIVATE_BASE cannot be used as control class
423            when using extended controls.
424            Only when passed in through VIDIOC_G_CTRL and VIDIOC_S_CTRL
425            is it allowed for backwards compatibility.
426          */
427         if (!allow_priv && c->ctrl_class == V4L2_CID_PRIVATE_BASE)
428                 return 0;
429         /* Check that all controls are from the same control class. */
430         for (i = 0; i < c->count; i++) {
431                 if (V4L2_CTRL_ID2CLASS(c->controls[i].id) != c->ctrl_class) {
432                         c->error_idx = i;
433                         return 0;
434                 }
435         }
436         return 1;
437 }
438 
439 static int check_fmt(const struct v4l2_ioctl_ops *ops, enum v4l2_buf_type type)
440 {
441         if (ops == NULL)
442                 return -EINVAL;
443 
444         switch (type) {
445         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
446                 if (ops->vidioc_g_fmt_vid_cap ||
447                                 ops->vidioc_g_fmt_vid_cap_mplane)
448                         return 0;
449                 break;
450         case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
451                 if (ops->vidioc_g_fmt_vid_cap_mplane)
452                         return 0;
453                 break;
454         case V4L2_BUF_TYPE_VIDEO_OVERLAY:
455                 if (ops->vidioc_g_fmt_vid_overlay)
456                         return 0;
457                 break;
458         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
459                 if (ops->vidioc_g_fmt_vid_out ||
460                                 ops->vidioc_g_fmt_vid_out_mplane)
461                         return 0;
462                 break;
463         case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
464                 if (ops->vidioc_g_fmt_vid_out_mplane)
465                         return 0;
466                 break;
467         case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
468                 if (ops->vidioc_g_fmt_vid_out_overlay)
469                         return 0;
470                 break;
471         case V4L2_BUF_TYPE_VBI_CAPTURE:
472                 if (ops->vidioc_g_fmt_vbi_cap)
473                         return 0;
474                 break;
475         case V4L2_BUF_TYPE_VBI_OUTPUT:
476                 if (ops->vidioc_g_fmt_vbi_out)
477                         return 0;
478                 break;
479         case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
480                 if (ops->vidioc_g_fmt_sliced_vbi_cap)
481                         return 0;
482                 break;
483         case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
484                 if (ops->vidioc_g_fmt_sliced_vbi_out)
485                         return 0;
486                 break;
487         case V4L2_BUF_TYPE_PRIVATE:
488                 if (ops->vidioc_g_fmt_type_private)
489                         return 0;
490                 break;
491         }
492         return -EINVAL;
493 }
494 
495 static long __video_do_ioctl(struct file *file,
496                 unsigned int cmd, void *arg)
497 {
498         struct video_device *vfd = video_devdata(file);
499         const struct v4l2_ioctl_ops *ops = vfd->ioctl_ops;
500         void *fh = file->private_data;
501         struct v4l2_fh *vfh = NULL;
502         int use_fh_prio = 0;
503         long ret_prio = 0;
504         long ret = -ENOTTY;
505 
506         if (ops == NULL) {
507                 printk(KERN_WARNING "videodev: \"%s\" has no ioctl_ops.\n",
508                                 vfd->name);
509                 return ret;
510         }
511 
512         if ((vfd->debug & V4L2_DEBUG_IOCTL) &&
513                                 !(vfd->debug & V4L2_DEBUG_IOCTL_ARG)) {
514                 v4l_print_ioctl(vfd->name, cmd);
515                 printk(KERN_CONT "\n");
516         }
517 
518         if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
519                 vfh = file->private_data;
520                 use_fh_prio = test_bit(V4L2_FL_USE_FH_PRIO, &vfd->flags);
521         }
522 
523         if (use_fh_prio)
524                 ret_prio = v4l2_prio_check(vfd->prio, vfh->prio);
525 
526         switch (cmd) {
527 
528         /* --- capabilities ------------------------------------------ */
529         case VIDIOC_QUERYCAP:
530         {
531                 struct v4l2_capability *cap = (struct v4l2_capability *)arg;
532 
533                 if (!ops->vidioc_querycap)
534                         break;
535 
536                 cap->version = LINUX_VERSION_CODE;
537                 ret = ops->vidioc_querycap(file, fh, cap);
538                 if (!ret)
539                         dbgarg(cmd, "driver=%s, card=%s, bus=%s, "
540                                         "version=0x%08x, "
541                                         "capabilities=0x%08x\n",
542                                         cap->driver, cap->card, cap->bus_info,
543                                         cap->version,
544                                         cap->capabilities);
545                 break;
546         }
547 
548         /* --- priority ------------------------------------------ */
549         case VIDIOC_G_PRIORITY:
550         {
551                 enum v4l2_priority *p = arg;
552 
553                 if (ops->vidioc_g_priority) {
554                         ret = ops->vidioc_g_priority(file, fh, p);
555                 } else if (use_fh_prio) {
556                         *p = v4l2_prio_max(&vfd->v4l2_dev->prio);
557                         ret = 0;
558                 }
559                 if (!ret)
560                         dbgarg(cmd, "priority is %d\n", *p);
561                 break;
562         }
563         case VIDIOC_S_PRIORITY:
564         {
565                 enum v4l2_priority *p = arg;
566 
567                 if (!ops->vidioc_s_priority && !use_fh_prio)
568                         break;
569                 dbgarg(cmd, "setting priority to %d\n", *p);
570                 if (ops->vidioc_s_priority)
571                         ret = ops->vidioc_s_priority(file, fh, *p);
572                 else
573                         ret = ret_prio ? ret_prio :
574                                 v4l2_prio_change(&vfd->v4l2_dev->prio,
575                                                         &vfh->prio, *p);
576                 break;
577         }
578 
579         /* --- capture ioctls ---------------------------------------- */
580         case VIDIOC_ENUM_FMT:
581         {
582                 struct v4l2_fmtdesc *f = arg;
583 
584                 switch (f->type) {
585                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
586                         if (likely(ops->vidioc_enum_fmt_vid_cap))
587                                 ret = ops->vidioc_enum_fmt_vid_cap(file, fh, f);
588                         break;
589                 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
590                         if (likely(ops->vidioc_enum_fmt_vid_cap_mplane))
591                                 ret = ops->vidioc_enum_fmt_vid_cap_mplane(file,
592                                                                         fh, f);
593                         break;
594                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
595                         if (likely(ops->vidioc_enum_fmt_vid_overlay))
596                                 ret = ops->vidioc_enum_fmt_vid_overlay(file,
597                                         fh, f);
598                         break;
599                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
600                         if (likely(ops->vidioc_enum_fmt_vid_out))
601                                 ret = ops->vidioc_enum_fmt_vid_out(file, fh, f);
602                         break;
603                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
604                         if (likely(ops->vidioc_enum_fmt_vid_out_mplane))
605                                 ret = ops->vidioc_enum_fmt_vid_out_mplane(file,
606                                                                         fh, f);
607                         break;
608                 case V4L2_BUF_TYPE_PRIVATE:
609                         if (likely(ops->vidioc_enum_fmt_type_private))
610                                 ret = ops->vidioc_enum_fmt_type_private(file,
611                                                                 fh, f);
612                         break;
613                 default:
614                         break;
615                 }
616                 if (likely (!ret))
617                         dbgarg(cmd, "index=%d, type=%d, flags=%d, "
618                                 "pixelformat=%c%c%c%c, description='%s'\n",
619                                 f->index, f->type, f->flags,
620                                 (f->pixelformat & 0xff),
621                                 (f->pixelformat >>  8) & 0xff,
622                                 (f->pixelformat >> 16) & 0xff,
623                                 (f->pixelformat >> 24) & 0xff,
624                                 f->description);
625                 else if (ret == -ENOTTY &&
626                          (ops->vidioc_enum_fmt_vid_cap ||
627                           ops->vidioc_enum_fmt_vid_out ||
628                           ops->vidioc_enum_fmt_vid_cap_mplane ||
629                           ops->vidioc_enum_fmt_vid_out_mplane ||
630                           ops->vidioc_enum_fmt_vid_overlay ||
631                           ops->vidioc_enum_fmt_type_private))
632                         ret = -EINVAL;
633                 break;
634         }
635         case VIDIOC_G_FMT:
636         {
637                 struct v4l2_format *f = (struct v4l2_format *)arg;
638 
639                 /* FIXME: Should be one dump per type */
640                 dbgarg(cmd, "type=%s\n", prt_names(f->type, v4l2_type_names));
641 
642                 switch (f->type) {
643                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
644                         if (ops->vidioc_g_fmt_vid_cap)
645                                 ret = ops->vidioc_g_fmt_vid_cap(file, fh, f);
646                         if (!ret)
647                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
648                         break;
649                 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
650                         if (ops->vidioc_g_fmt_vid_cap_mplane)
651                                 ret = ops->vidioc_g_fmt_vid_cap_mplane(file,
652                                                                         fh, f);
653                         if (!ret)
654                                 v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
655                         break;
656                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
657                         if (likely(ops->vidioc_g_fmt_vid_overlay))
658                                 ret = ops->vidioc_g_fmt_vid_overlay(file,
659                                                                     fh, f);
660                         break;
661                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
662                         if (ops->vidioc_g_fmt_vid_out)
663                                 ret = ops->vidioc_g_fmt_vid_out(file, fh, f);
664                         if (!ret)
665                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
666                         break;
667                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
668                         if (ops->vidioc_g_fmt_vid_out_mplane)
669                                 ret = ops->vidioc_g_fmt_vid_out_mplane(file,
670                                                                         fh, f);
671                         if (!ret)
672                                 v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
673                         break;
674                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
675                         if (likely(ops->vidioc_g_fmt_vid_out_overlay))
676                                 ret = ops->vidioc_g_fmt_vid_out_overlay(file,
677                                        fh, f);
678                         break;
679                 case V4L2_BUF_TYPE_VBI_CAPTURE:
680                         if (likely(ops->vidioc_g_fmt_vbi_cap))
681                                 ret = ops->vidioc_g_fmt_vbi_cap(file, fh, f);
682                         break;
683                 case V4L2_BUF_TYPE_VBI_OUTPUT:
684                         if (likely(ops->vidioc_g_fmt_vbi_out))
685                                 ret = ops->vidioc_g_fmt_vbi_out(file, fh, f);
686                         break;
687                 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
688                         if (likely(ops->vidioc_g_fmt_sliced_vbi_cap))
689                                 ret = ops->vidioc_g_fmt_sliced_vbi_cap(file,
690                                                                         fh, f);
691                         break;
692                 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
693                         if (likely(ops->vidioc_g_fmt_sliced_vbi_out))
694                                 ret = ops->vidioc_g_fmt_sliced_vbi_out(file,
695                                                                         fh, f);
696                         break;
697                 case V4L2_BUF_TYPE_PRIVATE:
698                         if (likely(ops->vidioc_g_fmt_type_private))
699                                 ret = ops->vidioc_g_fmt_type_private(file,
700                                                                 fh, f);
701                         break;
702                 }
703                 if (unlikely(ret == -ENOTTY && have_fmt_ops(g)))
704                         ret = -EINVAL;
705 
706                 break;
707         }
708         case VIDIOC_S_FMT:
709         {
710                 struct v4l2_format *f = (struct v4l2_format *)arg;
711 
712                 if (!have_fmt_ops(s))
713                         break;
714                 if (ret_prio) {
715                         ret = ret_prio;
716                         break;
717                 }
718                 ret = -EINVAL;
719 
720                 /* FIXME: Should be one dump per type */
721                 dbgarg(cmd, "type=%s\n", prt_names(f->type, v4l2_type_names));
722 
723                 switch (f->type) {
724                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
725                         CLEAR_AFTER_FIELD(f, fmt.pix);
726                         v4l_print_pix_fmt(vfd, &f->fmt.pix);
727                         if (ops->vidioc_s_fmt_vid_cap)
728                                 ret = ops->vidioc_s_fmt_vid_cap(file, fh, f);
729                         break;
730                 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
731                         CLEAR_AFTER_FIELD(f, fmt.pix_mp);
732                         v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
733                         if (ops->vidioc_s_fmt_vid_cap_mplane)
734                                 ret = ops->vidioc_s_fmt_vid_cap_mplane(file,
735                                                                         fh, f);
736                         break;
737                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
738                         CLEAR_AFTER_FIELD(f, fmt.win);
739                         if (ops->vidioc_s_fmt_vid_overlay)
740                                 ret = ops->vidioc_s_fmt_vid_overlay(file,
741                                                                     fh, f);
742                         break;
743                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
744                         CLEAR_AFTER_FIELD(f, fmt.pix);
745                         v4l_print_pix_fmt(vfd, &f->fmt.pix);
746                         if (ops->vidioc_s_fmt_vid_out)
747                                 ret = ops->vidioc_s_fmt_vid_out(file, fh, f);
748                         break;
749                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
750                         CLEAR_AFTER_FIELD(f, fmt.pix_mp);
751                         v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
752                         if (ops->vidioc_s_fmt_vid_out_mplane)
753                                 ret = ops->vidioc_s_fmt_vid_out_mplane(file,
754                                                                         fh, f);
755                         break;
756                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
757                         CLEAR_AFTER_FIELD(f, fmt.win);
758                         if (ops->vidioc_s_fmt_vid_out_overlay)
759                                 ret = ops->vidioc_s_fmt_vid_out_overlay(file,
760                                         fh, f);
761                         break;
762                 case V4L2_BUF_TYPE_VBI_CAPTURE:
763                         CLEAR_AFTER_FIELD(f, fmt.vbi);
764                         if (likely(ops->vidioc_s_fmt_vbi_cap))
765                                 ret = ops->vidioc_s_fmt_vbi_cap(file, fh, f);
766                         break;
767                 case V4L2_BUF_TYPE_VBI_OUTPUT:
768                         CLEAR_AFTER_FIELD(f, fmt.vbi);
769                         if (likely(ops->vidioc_s_fmt_vbi_out))
770                                 ret = ops->vidioc_s_fmt_vbi_out(file, fh, f);
771                         break;
772                 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
773                         CLEAR_AFTER_FIELD(f, fmt.sliced);
774                         if (likely(ops->vidioc_s_fmt_sliced_vbi_cap))
775                                 ret = ops->vidioc_s_fmt_sliced_vbi_cap(file,
776                                                                         fh, f);
777                         break;
778                 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
779                         CLEAR_AFTER_FIELD(f, fmt.sliced);
780                         if (likely(ops->vidioc_s_fmt_sliced_vbi_out))
781                                 ret = ops->vidioc_s_fmt_sliced_vbi_out(file,
782                                                                         fh, f);
783 
784                         break;
785                 case V4L2_BUF_TYPE_PRIVATE:
786                         /* CLEAR_AFTER_FIELD(f, fmt.raw_data); <- does nothing */
787                         if (likely(ops->vidioc_s_fmt_type_private))
788                                 ret = ops->vidioc_s_fmt_type_private(file,
789                                                                 fh, f);
790                         break;
791                 }
792                 break;
793         }
794         case VIDIOC_TRY_FMT:
795         {
796                 struct v4l2_format *f = (struct v4l2_format *)arg;
797 
798                 /* FIXME: Should be one dump per type */
799                 dbgarg(cmd, "type=%s\n", prt_names(f->type,
800                                                 v4l2_type_names));
801                 switch (f->type) {
802                 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
803                         CLEAR_AFTER_FIELD(f, fmt.pix);
804                         if (ops->vidioc_try_fmt_vid_cap)
805                                 ret = ops->vidioc_try_fmt_vid_cap(file, fh, f);
806                         if (!ret)
807                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
808                         break;
809                 case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
810                         CLEAR_AFTER_FIELD(f, fmt.pix_mp);
811                         if (ops->vidioc_try_fmt_vid_cap_mplane)
812                                 ret = ops->vidioc_try_fmt_vid_cap_mplane(file,
813                                                                          fh, f);
814                         if (!ret)
815                                 v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
816                         break;
817                 case V4L2_BUF_TYPE_VIDEO_OVERLAY:
818                         CLEAR_AFTER_FIELD(f, fmt.win);
819                         if (likely(ops->vidioc_try_fmt_vid_overlay))
820                                 ret = ops->vidioc_try_fmt_vid_overlay(file,
821                                         fh, f);
822                         break;
823                 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
824                         CLEAR_AFTER_FIELD(f, fmt.pix);
825                         if (ops->vidioc_try_fmt_vid_out)
826                                 ret = ops->vidioc_try_fmt_vid_out(file, fh, f);
827                         if (!ret)
828                                 v4l_print_pix_fmt(vfd, &f->fmt.pix);
829                         break;
830                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
831                         CLEAR_AFTER_FIELD(f, fmt.pix_mp);
832                         if (ops->vidioc_try_fmt_vid_out_mplane)
833                                 ret = ops->vidioc_try_fmt_vid_out_mplane(file,
834                                                                          fh, f);
835                         if (!ret)
836                                 v4l_print_pix_fmt_mplane(vfd, &f->fmt.pix_mp);
837                         break;
838                 case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
839                         CLEAR_AFTER_FIELD(f, fmt.win);
840                         if (likely(ops->vidioc_try_fmt_vid_out_overlay))
841                                 ret = ops->vidioc_try_fmt_vid_out_overlay(file,
842                                        fh, f);
843                         break;
844                 case V4L2_BUF_TYPE_VBI_CAPTURE:
845                         CLEAR_AFTER_FIELD(f, fmt.vbi);
846                         if (likely(ops->vidioc_try_fmt_vbi_cap))
847                                 ret = ops->vidioc_try_fmt_vbi_cap(file, fh, f);
848                         break;
849                 case V4L2_BUF_TYPE_VBI_OUTPUT:
850                         CLEAR_AFTER_FIELD(f, fmt.vbi);
851                         if (likely(ops->vidioc_try_fmt_vbi_out))
852                                 ret = ops->vidioc_try_fmt_vbi_out(file, fh, f);
853                         break;
854                 case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
855                         CLEAR_AFTER_FIELD(f, fmt.sliced);
856                         if (likely(ops->vidioc_try_fmt_sliced_vbi_cap))
857                                 ret = ops->vidioc_try_fmt_sliced_vbi_cap(file,
858                                                                 fh, f);
859                         break;
860                 case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
861                         CLEAR_AFTER_FIELD(f, fmt.sliced);
862                         if (likely(ops->vidioc_try_fmt_sliced_vbi_out))
863                                 ret = ops->vidioc_try_fmt_sliced_vbi_out(file,
864                                                                 fh, f);
865                         break;
866                 case V4L2_BUF_TYPE_PRIVATE:
867                         /* CLEAR_AFTER_FIELD(f, fmt.raw_data); <- does nothing */
868                         if (likely(ops->vidioc_try_fmt_type_private))
869                                 ret = ops->vidioc_try_fmt_type_private(file,
870                                                                 fh, f);
871                         break;
872                 }
873                 if (unlikely(ret == -ENOTTY && have_fmt_ops(try)))
874                         ret = -EINVAL;
875                 break;
876         }
877         /* FIXME: Those buf reqs could be handled here,
878            with some changes on videobuf to allow its header to be included at
879            videodev2.h or being merged at videodev2.
880          */
881         case VIDIOC_REQBUFS:
882         {
883                 struct v4l2_requestbuffers *p = arg;
884 
885                 if (!ops->vidioc_reqbufs)
886                         break;
887                 if (ret_prio) {
888                         ret = ret_prio;
889                         break;
890                 }
891                 ret = check_fmt(ops, p->type);
892                 if (ret)
893                         break;
894 
895                 if (p->type < V4L2_BUF_TYPE_PRIVATE)
896                         CLEAR_AFTER_FIELD(p, memory);
897 
898                 ret = ops->vidioc_reqbufs(file, fh, p);
899                 dbgarg(cmd, "count=%d, type=%s, memory=%s\n",
900                                 p->count,
901                                 prt_names(p->type, v4l2_type_names),
902                                 prt_names(p->memory, v4l2_memory_names));
903                 break;
904         }
905         case VIDIOC_QUERYBUF:
906         {
907                 struct v4l2_buffer *p = arg;
908 
909                 if (!ops->vidioc_querybuf)
910                         break;
911                 ret = check_fmt(ops, p->type);
912                 if (ret)
913                         break;
914 
915                 ret = ops->vidioc_querybuf(file, fh, p);
916                 if (!ret)
917                         dbgbuf(cmd, vfd, p);
918                 break;
919         }
920         case VIDIOC_QBUF:
921         {
922                 struct v4l2_buffer *p = arg;
923 
924                 if (!ops->vidioc_qbuf)
925                         break;
926                 ret = check_fmt(ops, p->type);
927                 if (ret)
928                         break;
929 
930                 ret = ops->vidioc_qbuf(file, fh, p);
931                 if (!ret)
932                         dbgbuf(cmd, vfd, p);
933                 break;
934         }
935         case VIDIOC_DQBUF:
936         {
937                 struct v4l2_buffer *p = arg;
938 
939                 if (!ops->vidioc_dqbuf)
940                         break;
941                 ret = check_fmt(ops, p->type);
942                 if (ret)
943                         break;
944 
945                 ret = ops->vidioc_dqbuf(file, fh, p);
946                 if (!ret)
947                         dbgbuf(cmd, vfd, p);
948                 break;
949         }
950         case VIDIOC_OVERLAY:
951         {
952                 int *i = arg;
953 
954                 if (!ops->vidioc_overlay)
955                         break;
956                 if (ret_prio) {
957                         ret = ret_prio;
958                         break;
959                 }
960                 dbgarg(cmd, "value=%d\n", *i);
961                 ret = ops->vidioc_overlay(file, fh, *i);
962                 break;
963         }
964         case VIDIOC_G_FBUF:
965         {
966                 struct v4l2_framebuffer *p = arg;
967 
968                 if (!ops->vidioc_g_fbuf)
969                         break;
970                 ret = ops->vidioc_g_fbuf(file, fh, arg);
971                 if (!ret) {
972                         dbgarg(cmd, "capability=0x%x, flags=%d, base=0x%08lx\n",
973                                         p->capability, p->flags,
974                                         (unsigned long)p->base);
975                         v4l_print_pix_fmt(vfd, &p->fmt);
976                 }
977                 break;
978         }
979         case VIDIOC_S_FBUF:
980         {
981                 struct v4l2_framebuffer *p = arg;
982 
983                 if (!ops->vidioc_s_fbuf)
984                         break;
985                 if (ret_prio) {
986                         ret = ret_prio;
987                         break;
988                 }
989                 dbgarg(cmd, "capability=0x%x, flags=%d, base=0x%08lx\n",
990                         p->capability, p->flags, (unsigned long)p->base);
991                 v4l_print_pix_fmt(vfd, &p->fmt);
992                 ret = ops->vidioc_s_fbuf(file, fh, arg);
993                 break;
994         }
995         case VIDIOC_STREAMON:
996         {
997                 enum v4l2_buf_type i = *(int *)arg;
998 
999                 if (!ops->vidioc_streamon)
1000                         break;
1001                 if (ret_prio) {
1002                         ret = ret_prio;
1003                         break;
1004                 }
1005                 dbgarg(cmd, "type=%s\n", prt_names(i, v4l2_type_names));
1006                 ret = ops->vidioc_streamon(file, fh, i);
1007                 break;
1008         }
1009         case VIDIOC_STREAMOFF:
1010         {
1011                 enum v4l2_buf_type i = *(int *)arg;
1012 
1013                 if (!ops->vidioc_streamoff)
1014                         break;
1015                 if (ret_prio) {
1016                         ret = ret_prio;
1017                         break;
1018                 }
1019                 dbgarg(cmd, "type=%s\n", prt_names(i, v4l2_type_names));
1020                 ret = ops->vidioc_streamoff(file, fh, i);
1021                 break;
1022         }
1023         /* ---------- tv norms ---------- */
1024         case VIDIOC_ENUMSTD:
1025         {
1026                 struct v4l2_standard *p = arg;
1027                 v4l2_std_id id = vfd->tvnorms, curr_id = 0;
1028                 unsigned int index = p->index, i, j = 0;
1029                 const char *descr = "";
1030 
1031                 if (id == 0)
1032                         break;
1033                 ret = -EINVAL;
1034 
1035                 /* Return norm array in a canonical way */
1036                 for (i = 0; i <= index && id; i++) {
1037                         /* last std value in the standards array is 0, so this
1038                            while always ends there since (id & 0) == 0. */
1039                         while ((id & standards[j].std) != standards[j].std)
1040                                 j++;
1041                         curr_id = standards[j].std;
1042                         descr = standards[j].descr;
1043                         j++;
1044                         if (curr_id == 0)
1045                                 break;
1046                         if (curr_id != V4L2_STD_PAL &&
1047                             curr_id != V4L2_STD_SECAM &&
1048                             curr_id != V4L2_STD_NTSC)
1049                                 id &= ~curr_id;
1050                 }
1051                 if (i <= index)
1052                         break;
1053 
1054                 v4l2_video_std_construct(p, curr_id, descr);
1055 
1056                 dbgarg(cmd, "index=%d, id=0x%Lx, name=%s, fps=%d/%d, "
1057                                 "framelines=%d\n", p->index,
1058                                 (unsigned long long)p->id, p->name,
1059                                 p->frameperiod.numerator,
1060                                 p->frameperiod.denominator,
1061                                 p->framelines);
1062 
1063                 ret = 0;
1064                 break;
1065         }
1066         case VIDIOC_G_STD:
1067         {
1068                 v4l2_std_id *id = arg;
1069 
1070                 /* Calls the specific handler */
1071                 if (ops->vidioc_g_std)
1072                         ret = ops->vidioc_g_std(file, fh, id);
1073                 else if (vfd->current_norm) {
1074                         ret = 0;
1075                         *id = vfd->current_norm;
1076                 }
1077 
1078                 if (likely(!ret))
1079                         dbgarg(cmd, "std=0x%08Lx\n", (long long unsigned)*id);
1080                 break;
1081         }
1082         case VIDIOC_S_STD:
1083         {
1084                 v4l2_std_id *id = arg, norm;
1085 
1086                 dbgarg(cmd, "std=%08Lx\n", (long long unsigned)*id);
1087 
1088                 if (!ops->vidioc_s_std)
1089                         break;
1090 
1091                 if (ret_prio) {
1092                         ret = ret_prio;
1093                         break;
1094                 }
1095                 ret = -EINVAL;
1096                 norm = (*id) & vfd->tvnorms;
1097                 if (vfd->tvnorms && !norm)      /* Check if std is supported */
1098                         break;
1099 
1100                 /* Calls the specific handler */
1101                 ret = ops->vidioc_s_std(file, fh, &norm);
1102 
1103                 /* Updates standard information */
1104                 if (ret >= 0)
1105                         vfd->current_norm = norm;
1106                 break;
1107         }
1108         case VIDIOC_QUERYSTD:
1109         {
1110                 v4l2_std_id *p = arg;
1111 
1112                 if (!ops->vidioc_querystd)
1113                         break;
1114                 /*
1115                  * If nothing detected, it should return all supported
1116                  * Drivers just need to mask the std argument, in order
1117                  * to remove the standards that don't apply from the mask.
1118                  * This means that tuners, audio and video decoders can join
1119                  * their efforts to improve the standards detection
1120                  */
1121                 *p = vfd->tvnorms;
1122                 ret = ops->vidioc_querystd(file, fh, arg);
1123                 if (!ret)
1124                         dbgarg(cmd, "detected std=%08Lx\n",
1125                                                 (unsigned long long)*p);
1126                 break;
1127         }
1128         /* ------ input switching ---------- */
1129         /* FIXME: Inputs can be handled inside videodev2 */
1130         case VIDIOC_ENUMINPUT:
1131         {
1132                 struct v4l2_input *p = arg;
1133 
1134                 /*
1135                  * We set the flags for CAP_PRESETS, CAP_CUSTOM_TIMINGS &
1136                  * CAP_STD here based on ioctl handler provided by the
1137                  * driver. If the driver doesn't support these
1138                  * for a specific input, it must override these flags.
1139                  */
1140                 if (ops->vidioc_s_std)
1141                         p->capabilities |= V4L2_IN_CAP_STD;
1142                 if (ops->vidioc_s_dv_preset)
1143                         p->capabilities |= V4L2_IN_CAP_PRESETS;
1144                 if (ops->vidioc_s_dv_timings)
1145                         p->capabilities |= V4L2_IN_CAP_CUSTOM_TIMINGS;
1146 
1147                 if (!ops->vidioc_enum_input)
1148                         break;
1149 
1150                 ret = ops->vidioc_enum_input(file, fh, p);
1151                 if (!ret)
1152                         dbgarg(cmd, "index=%d, name=%s, type=%d, "
1153                                 "audioset=%d, "
1154                                 "tuner=%d, std=%08Lx, status=%d\n",
1155                                 p->index, p->name, p->type, p->audioset,
1156                                 p->tuner,
1157                                 (unsigned long long)p->std,
1158                                 p->status);
1159                 break;
1160         }
1161         case VIDIOC_G_INPUT:
1162         {
1163                 unsigned int *i = arg;
1164 
1165                 if (!ops->vidioc_g_input)
1166                         break;
1167                 ret = ops->vidioc_g_input(file, fh, i);
1168                 if (!ret)
1169                         dbgarg(cmd, "value=%d\n", *i);
1170                 break;
1171         }
1172         case VIDIOC_S_INPUT:
1173         {
1174                 unsigned int *i = arg;
1175 
1176                 if (!ops->vidioc_s_input)
1177                         break;
1178                 if (ret_prio) {
1179                         ret = ret_prio;
1180                         break;
1181                 }
1182                 dbgarg(cmd, "value=%d\n", *i);
1183                 ret = ops->vidioc_s_input(file, fh, *i);
1184                 break;
1185         }
1186 
1187         /* ------ output switching ---------- */
1188         case VIDIOC_ENUMOUTPUT:
1189         {
1190                 struct v4l2_output *p = arg;
1191 
1192                 if (!ops->vidioc_enum_output)
1193                         break;
1194 
1195                 /*
1196                  * We set the flags for CAP_PRESETS, CAP_CUSTOM_TIMINGS &
1197                  * CAP_STD here based on ioctl handler provided by the
1198                  * driver. If the driver doesn't support these
1199                  * for a specific output, it must override these flags.
1200                  */
1201                 if (ops->vidioc_s_std)
1202                         p->capabilities |= V4L2_OUT_CAP_STD;
1203                 if (ops->vidioc_s_dv_preset)
1204                         p->capabilities |= V4L2_OUT_CAP_PRESETS;
1205                 if (ops->vidioc_s_dv_timings)
1206                         p->capabilities |= V4L2_OUT_CAP_CUSTOM_TIMINGS;
1207 
1208                 ret = ops->vidioc_enum_output(file, fh, p);
1209                 if (!ret)
1210                         dbgarg(cmd, "index=%d, name=%s, type=%d, "
1211                                 "audioset=0x%x, "
1212                                 "modulator=%d, std=0x%08Lx\n",
1213                                 p->index, p->name, p->type, p->audioset,
1214                                 p->modulator, (unsigned long long)p->std);
1215                 break;
1216         }
1217         case VIDIOC_G_OUTPUT:
1218         {
1219                 unsigned int *i = arg;
1220 
1221                 if (!ops->vidioc_g_output)
1222                         break;
1223                 ret = ops->vidioc_g_output(file, fh, i);
1224                 if (!ret)
1225                         dbgarg(cmd, "value=%d\n", *i);
1226                 break;
1227         }
1228         case VIDIOC_S_OUTPUT:
1229         {
1230                 unsigned int *i = arg;
1231 
1232                 if (!ops->vidioc_s_output)
1233                         break;
1234                 if (ret_prio) {
1235                         ret = ret_prio;
1236                         break;
1237                 }
1238                 dbgarg(cmd, "value=%d\n", *i);
1239                 ret = ops->vidioc_s_output(file, fh, *i);
1240                 break;
1241         }
1242 
1243         /* --- controls ---------------------------------------------- */
1244         case VIDIOC_QUERYCTRL:
1245         {
1246                 struct v4l2_queryctrl *p = arg;
1247 
1248                 if (vfh && vfh->ctrl_handler)
1249                         ret = v4l2_queryctrl(vfh->ctrl_handler, p);
1250                 else if (vfd->ctrl_handler)
1251                         ret = v4l2_queryctrl(vfd->ctrl_handler, p);
1252                 else if (ops->vidioc_queryctrl)
1253                         ret = ops->vidioc_queryctrl(file, fh, p);
1254                 else
1255                         break;
1256                 if (!ret)
1257                         dbgarg(cmd, "id=0x%x, type=%d, name=%s, min/max=%d/%d, "
1258                                         "step=%d, default=%d, flags=0x%08x\n",
1259                                         p->id, p->type, p->name,
1260                                         p->minimum, p->maximum,
1261                                         p->step, p->default_value, p->flags);
1262                 else
1263                         dbgarg(cmd, "id=0x%x\n", p->id);
1264                 break;
1265         }
1266         case VIDIOC_G_CTRL:
1267         {
1268                 struct v4l2_control *p = arg;
1269 
1270                 if (vfh && vfh->ctrl_handler)
1271                         ret = v4l2_g_ctrl(vfh->ctrl_handler, p);
1272                 else if (vfd->ctrl_handler)
1273                         ret = v4l2_g_ctrl(vfd->ctrl_handler, p);
1274                 else if (ops->vidioc_g_ctrl)
1275                         ret = ops->vidioc_g_ctrl(file, fh, p);
1276                 else if (ops->vidioc_g_ext_ctrls) {
1277                         struct v4l2_ext_controls ctrls;
1278                         struct v4l2_ext_control ctrl;
1279 
1280                         ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
1281                         ctrls.count = 1;
1282                         ctrls.controls = &ctrl;
1283                         ctrl.id = p->id;
1284                         ctrl.value = p->value;
1285                         if (check_ext_ctrls(&ctrls, 1)) {
1286                                 ret = ops->vidioc_g_ext_ctrls(file, fh, &ctrls);
1287                                 if (ret == 0)
1288                                         p->value = ctrl.value;
1289                         }
1290                 } else
1291                         break;
1292                 if (!ret)
1293                         dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value);
1294                 else
1295                         dbgarg(cmd, "id=0x%x\n", p->id);
1296                 break;
1297         }
1298         case VIDIOC_S_CTRL:
1299         {
1300                 struct v4l2_control *p = arg;
1301                 struct v4l2_ext_controls ctrls;
1302                 struct v4l2_ext_control ctrl;
1303 
1304                 if (!(vfh && vfh->ctrl_handler) && !vfd->ctrl_handler &&
1305                         !ops->vidioc_s_ctrl && !ops->vidioc_s_ext_ctrls)
1306                         break;
1307                 if (ret_prio) {
1308                         ret = ret_prio;
1309                         break;
1310                 }
1311 
1312                 dbgarg(cmd, "id=0x%x, value=%d\n", p->id, p->value);
1313 
1314                 if (vfh && vfh->ctrl_handler) {
1315                         ret = v4l2_s_ctrl(vfh, vfh->ctrl_handler, p);
1316                         break;
1317                 }
1318                 if (vfd->ctrl_handler) {
1319                         ret = v4l2_s_ctrl(NULL, vfd->ctrl_handler, p);
1320                         break;
1321                 }
1322                 if (ops->vidioc_s_ctrl) {
1323                         ret = ops->vidioc_s_ctrl(file, fh, p);
1324                         break;
1325                 }
1326                 if (!ops->vidioc_s_ext_ctrls)
1327                         break;
1328 
1329                 ctrls.ctrl_class = V4L2_CTRL_ID2CLASS(p->id);
1330                 ctrls.count = 1;
1331                 ctrls.controls = &ctrl;
1332                 ctrl.id = p->id;
1333                 ctrl.value = p->value;
1334                 if (check_ext_ctrls(&ctrls, 1))
1335                         ret = ops->vidioc_s_ext_ctrls(file, fh, &ctrls);
1336                 else
1337                         ret = -EINVAL;
1338                 break;
1339         }
1340         case VIDIOC_G_EXT_CTRLS:
1341         {
1342                 struct v4l2_ext_controls *p = arg;
1343 
1344                 p->error_idx = p->count;
1345                 if (vfh && vfh->ctrl_handler)
1346                         ret = v4l2_g_ext_ctrls(vfh->ctrl_handler, p);
1347                 else if (vfd->ctrl_handler)
1348                         ret = v4l2_g_ext_ctrls(vfd->ctrl_handler, p);
1349                 else if (ops->vidioc_g_ext_ctrls)
1350                         ret = check_ext_ctrls(p, 0) ?
1351                                 ops->vidioc_g_ext_ctrls(file, fh, p) :
1352                                 -EINVAL;
1353                 else
1354                         break;
1355                 v4l_print_ext_ctrls(cmd, vfd, p, !ret);
1356                 break;
1357         }
1358         case VIDIOC_S_EXT_CTRLS:
1359         {
1360                 struct v4l2_ext_controls *p = arg;
1361 
1362                 p->error_idx = p->count;
1363                 if (!(vfh && vfh->ctrl_handler) && !vfd->ctrl_handler &&
1364                                 !ops->vidioc_s_ext_ctrls)
1365                         break;
1366                 if (ret_prio) {
1367                         ret = ret_prio;
1368                         break;
1369                 }
1370                 v4l_print_ext_ctrls(cmd, vfd, p, 1);
1371                 if (vfh && vfh->ctrl_handler)
1372                         ret = v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, p);
1373                 else if (vfd->ctrl_handler)
1374                         ret = v4l2_s_ext_ctrls(NULL, vfd->ctrl_handler, p);
1375                 else if (check_ext_ctrls(p, 0))
1376                         ret = ops->vidioc_s_ext_ctrls(file, fh, p);
1377                 else
1378                         ret = -EINVAL;
1379                 break;
1380         }
1381         case VIDIOC_TRY_EXT_CTRLS:
1382         {
1383                 struct v4l2_ext_controls *p = arg;
1384 
1385                 p->error_idx = p->count;
1386                 if (!(vfh && vfh->ctrl_handler) && !vfd->ctrl_handler &&
1387                                 !ops->vidioc_try_ext_ctrls)
1388                         break;
1389                 v4l_print_ext_ctrls(cmd, vfd, p, 1);
1390                 if (vfh && vfh->ctrl_handler)
1391                         ret = v4l2_try_ext_ctrls(vfh->ctrl_handler, p);
1392                 else if (vfd->ctrl_handler)
1393                         ret = v4l2_try_ext_ctrls(vfd->ctrl_handler, p);
1394                 else if (check_ext_ctrls(p, 0))
1395                         ret = ops->vidioc_try_ext_ctrls(file, fh, p);
1396                 else
1397                         ret = -EINVAL;
1398                 break;
1399         }
1400         case VIDIOC_QUERYMENU:
1401         {
1402                 struct v4l2_querymenu *p = arg;
1403 
1404                 if (vfh && vfh->ctrl_handler)
1405                         ret = v4l2_querymenu(vfh->ctrl_handler, p);
1406                 else if (vfd->ctrl_handler)
1407                         ret = v4l2_querymenu(vfd->ctrl_handler, p);
1408                 else if (ops->vidioc_querymenu)
1409                         ret = ops->vidioc_querymenu(file, fh, p);
1410                 else
1411                         break;
1412                 if (!ret)
1413                         dbgarg(cmd, "id=0x%x, index=%d, name=%s\n",
1414                                 p->id, p->index, p->name);
1415                 else
1416                         dbgarg(cmd, "id=0x%x, index=%d\n",
1417                                 p->id, p->index);
1418                 break;
1419         }
1420         /* --- audio ---------------------------------------------- */
1421         case VIDIOC_ENUMAUDIO:
1422         {
1423                 struct v4l2_audio *p = arg;
1424 
1425                 if (!ops->vidioc_enumaudio)
1426                         break;
1427                 ret = ops->vidioc_enumaudio(file, fh, p);
1428                 if (!ret)
1429                         dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
1430                                         "mode=0x%x\n", p->index, p->name,
1431                                         p->capability, p->mode);
1432                 else
1433                         dbgarg(cmd, "index=%d\n", p->index);
1434                 break;
1435         }
1436         case VIDIOC_G_AUDIO:
1437         {
1438                 struct v4l2_audio *p = arg;
1439 
1440                 if (!ops->vidioc_g_audio)
1441                         break;
1442 
1443                 ret = ops->vidioc_g_audio(file, fh, p);
1444                 if (!ret)
1445                         dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
1446                                         "mode=0x%x\n", p->index,
1447                                         p->name, p->capability, p->mode);
1448                 else
1449                         dbgarg(cmd, "index=%d\n", p->index);
1450                 break;
1451         }
1452         case VIDIOC_S_AUDIO:
1453         {
1454                 struct v4l2_audio *p = arg;
1455 
1456                 if (!ops->vidioc_s_audio)
1457                         break;
1458                 if (ret_prio) {
1459                         ret = ret_prio;
1460                         break;
1461                 }
1462                 dbgarg(cmd, "index=%d, name=%s, capability=0x%x, "
1463                                         "mode=0x%x\n", p->index, p->name,
1464                                         p->capability, p->mode);
1465                 ret = ops->vidioc_s_audio(file, fh, p);
1466                 break;
1467         }
1468         case VIDIOC_ENUMAUDOUT:
1469         {
1470                 struct v4l2_audioout *p = arg;
1471 
1472                 if (!ops->vidioc_enumaudout)
1473                         break;
1474                 dbgarg(cmd, "Enum for index=%d\n", p->index);
1475                 ret = ops->vidioc_enumaudout(file, fh, p);
1476                 if (!ret)
1477                         dbgarg2("index=%d, name=%s, capability=%d, "
1478                                         "mode=%d\n", p->index, p->name,
1479                                         p->capability, p->mode);
1480                 break;
1481         }
1482         case VIDIOC_G_AUDOUT:
1483         {
1484                 struct v4l2_audioout *p = arg;
1485 
1486                 if (!ops->vidioc_g_audout)
1487                         break;
1488 
1489                 ret = ops->vidioc_g_audout(file, fh, p);
1490                 if (!ret)
1491                         dbgarg2("index=%d, name=%s, capability=%d, "
1492                                         "mode=%d\n", p->index, p->name,
1493                                         p->capability, p->mode);
1494                 break;
1495         }
1496         case VIDIOC_S_AUDOUT:
1497         {
1498                 struct v4l2_audioout *p = arg;
1499 
1500                 if (!ops->vidioc_s_audout)
1501                         break;
1502                 if (ret_prio) {
1503                         ret = ret_prio;
1504                         break;
1505                 }
1506                 dbgarg(cmd, "index=%d, name=%s, capability=%d, "
1507                                         "mode=%d\n", p->index, p->name,
1508                                         p->capability, p->mode);
1509 
1510                 ret = ops->vidioc_s_audout(file, fh, p);
1511                 break;
1512         }
1513         case VIDIOC_G_MODULATOR:
1514         {
1515                 struct v4l2_modulator *p = arg;
1516 
1517                 if (!ops->vidioc_g_modulator)
1518                         break;
1519                 ret = ops->vidioc_g_modulator(file, fh, p);
1520                 if (!ret)
1521                         dbgarg(cmd, "index=%d, name=%s, "
1522                                         "capability=%d, rangelow=%d,"
1523                                         " rangehigh=%d, txsubchans=%d\n",
1524                                         p->index, p->name, p->capability,
1525                                         p->rangelow, p->rangehigh,
1526                                         p->txsubchans);
1527                 break;
1528         }
1529         case VIDIOC_S_MODULATOR:
1530         {
1531                 struct v4l2_modulator *p = arg;
1532 
1533                 if (!ops->vidioc_s_modulator)
1534                         break;
1535                 if (ret_prio) {
1536                         ret = ret_prio;
1537                         break;
1538                 }
1539                 dbgarg(cmd, "index=%d, name=%s, capability=%d, "
1540                                 "rangelow=%d, rangehigh=%d, txsubchans=%d\n",
1541                                 p->index, p->name, p->capability, p->rangelow,
1542                                 p->rangehigh, p->txsubchans);
1543                         ret = ops->vidioc_s_modulator(file, fh, p);
1544                 break;
1545         }
1546         case VIDIOC_G_CROP:
1547         {
1548                 struct v4l2_crop *p = arg;
1549 
1550                 if (!ops->vidioc_g_crop)
1551                         break;
1552 
1553                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1554                 ret = ops->vidioc_g_crop(file, fh, p);
1555                 if (!ret)
1556                         dbgrect(vfd, "", &p->c);
1557                 break;
1558         }
1559         case VIDIOC_S_CROP:
1560         {
1561                 struct v4l2_crop *p = arg;
1562 
1563                 if (!ops->vidioc_s_crop)
1564                         break;
1565                 if (ret_prio) {
1566                         ret = ret_prio;
1567                         break;
1568                 }
1569                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1570                 dbgrect(vfd, "", &p->c);
1571                 ret = ops->vidioc_s_crop(file, fh, p);
1572                 break;
1573         }
1574         case VIDIOC_CROPCAP:
1575         {
1576                 struct v4l2_cropcap *p = arg;
1577 
1578                 /*FIXME: Should also show v4l2_fract pixelaspect */
1579                 if (!ops->vidioc_cropcap)
1580                         break;
1581 
1582                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1583                 ret = ops->vidioc_cropcap(file, fh, p);
1584                 if (!ret) {
1585                         dbgrect(vfd, "bounds ", &p->bounds);
1586                         dbgrect(vfd, "defrect ", &p->defrect);
1587                 }
1588                 break;
1589         }
1590         case VIDIOC_G_JPEGCOMP:
1591         {
1592                 struct v4l2_jpegcompression *p = arg;
1593 
1594                 if (!ops->vidioc_g_jpegcomp)
1595                         break;
1596 
1597                 ret = ops->vidioc_g_jpegcomp(file, fh, p);
1598                 if (!ret)
1599                         dbgarg(cmd, "quality=%d, APPn=%d, "
1600                                         "APP_len=%d, COM_len=%d, "
1601                                         "jpeg_markers=%d\n",
1602                                         p->quality, p->APPn, p->APP_len,
1603                                         p->COM_len, p->jpeg_markers);
1604                 break;
1605         }
1606         case VIDIOC_S_JPEGCOMP:
1607         {
1608                 struct v4l2_jpegcompression *p = arg;
1609 
1610                 if (!ops->vidioc_g_jpegcomp)
1611                         break;
1612                 if (ret_prio) {
1613                         ret = ret_prio;
1614                         break;
1615                 }
1616                 dbgarg(cmd, "quality=%d, APPn=%d, APP_len=%d, "
1617                                         "COM_len=%d, jpeg_markers=%d\n",
1618                                         p->quality, p->APPn, p->APP_len,
1619                                         p->COM_len, p->jpeg_markers);
1620                 ret = ops->vidioc_s_jpegcomp(file, fh, p);
1621                 break;
1622         }
1623         case VIDIOC_G_ENC_INDEX:
1624         {
1625                 struct v4l2_enc_idx *p = arg;
1626 
1627                 if (!ops->vidioc_g_enc_index)
1628                         break;
1629                 ret = ops->vidioc_g_enc_index(file, fh, p);
1630                 if (!ret)
1631                         dbgarg(cmd, "entries=%d, entries_cap=%d\n",
1632                                         p->entries, p->entries_cap);
1633                 break;
1634         }
1635         case VIDIOC_ENCODER_CMD:
1636         {
1637                 struct v4l2_encoder_cmd *p = arg;
1638 
1639                 if (!ops->vidioc_encoder_cmd)
1640                         break;
1641                 if (ret_prio) {
1642                         ret = ret_prio;
1643                         break;
1644                 }
1645                 ret = ops->vidioc_encoder_cmd(file, fh, p);
1646                 if (!ret)
1647                         dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
1648                 break;
1649         }
1650         case VIDIOC_TRY_ENCODER_CMD:
1651         {
1652                 struct v4l2_encoder_cmd *p = arg;
1653 
1654                 if (!ops->vidioc_try_encoder_cmd)
1655                         break;
1656                 ret = ops->vidioc_try_encoder_cmd(file, fh, p);
1657                 if (!ret)
1658                         dbgarg(cmd, "cmd=%d, flags=%x\n", p->cmd, p->flags);
1659                 break;
1660         }
1661         case VIDIOC_G_PARM:
1662         {
1663                 struct v4l2_streamparm *p = arg;
1664 
1665                 if (!ops->vidioc_g_parm && !vfd->current_norm)
1666                         break;
1667                 if (ops->vidioc_g_parm) {
1668                         ret = check_fmt(ops, p->type);
1669                         if (ret)
1670                                 break;
1671                         ret = ops->vidioc_g_parm(file, fh, p);
1672                 } else {
1673                         v4l2_std_id std = vfd->current_norm;
1674 
1675                         ret = -EINVAL;
1676                         if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1677                                 break;
1678 
1679                         ret = 0;
1680                         if (ops->vidioc_g_std)
1681                                 ret = ops->vidioc_g_std(file, fh, &std);
1682                         if (ret == 0)
1683                                 v4l2_video_std_frame_period(std,
1684                                                     &p->parm.capture.timeperframe);
1685                 }
1686 
1687                 dbgarg(cmd, "type=%d\n", p->type);
1688                 break;
1689         }
1690         case VIDIOC_S_PARM:
1691         {
1692                 struct v4l2_streamparm *p = arg;
1693 
1694                 if (!ops->vidioc_s_parm)
1695                         break;
1696                 if (ret_prio) {
1697                         ret = ret_prio;
1698                         break;
1699                 }
1700                 ret = check_fmt(ops, p->type);
1701                 if (ret)
1702                         break;
1703 
1704                 dbgarg(cmd, "type=%d\n", p->type);
1705                 ret = ops->vidioc_s_parm(file, fh, p);
1706                 break;
1707         }
1708         case VIDIOC_G_TUNER:
1709         {
1710                 struct v4l2_tuner *p = arg;
1711 
1712                 if (!ops->vidioc_g_tuner)
1713                         break;
1714 
1715                 p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1716                         V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1717                 ret = ops->vidioc_g_tuner(file, fh, p);
1718                 if (!ret)
1719                         dbgarg(cmd, "index=%d, name=%s, type=%d, "
1720                                         "capability=0x%x, rangelow=%d, "
1721                                         "rangehigh=%d, signal=%d, afc=%d, "
1722                                         "rxsubchans=0x%x, audmode=%d\n",
1723                                         p->index, p->name, p->type,
1724                                         p->capability, p->rangelow,
1725                                         p->rangehigh, p->signal, p->afc,
1726                                         p->rxsubchans, p->audmode);
1727                 break;
1728         }
1729         case VIDIOC_S_TUNER:
1730         {
1731                 struct v4l2_tuner *p = arg;
1732 
1733                 if (!ops->vidioc_s_tuner)
1734                         break;
1735                 if (ret_prio) {
1736                         ret = ret_prio;
1737                         break;
1738                 }
1739                 p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1740                         V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1741                 dbgarg(cmd, "index=%d, name=%s, type=%d, "
1742                                 "capability=0x%x, rangelow=%d, "
1743                                 "rangehigh=%d, signal=%d, afc=%d, "
1744                                 "rxsubchans=0x%x, audmode=%d\n",
1745                                 p->index, p->name, p->type,
1746                                 p->capability, p->rangelow,
1747                                 p->rangehigh, p->signal, p->afc,
1748                                 p->rxsubchans, p->audmode);
1749                 ret = ops->vidioc_s_tuner(file, fh, p);
1750                 break;
1751         }
1752         case VIDIOC_G_FREQUENCY:
1753         {
1754                 struct v4l2_frequency *p = arg;
1755 
1756                 if (!ops->vidioc_g_frequency)
1757                         break;
1758 
1759                 p->type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1760                         V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1761                 ret = ops->vidioc_g_frequency(file, fh, p);
1762                 if (!ret)
1763                         dbgarg(cmd, "tuner=%d, type=%d, frequency=%d\n",
1764                                         p->tuner, p->type, p->frequency);
1765                 break;
1766         }
1767         case VIDIOC_S_FREQUENCY:
1768         {
1769                 struct v4l2_frequency *p = arg;
1770 
1771                 if (!ops->vidioc_s_frequency)
1772                         break;
1773                 if (ret_prio) {
1774                         ret = ret_prio;
1775                         break;
1776                 }
1777                 dbgarg(cmd, "tuner=%d, type=%d, frequency=%d\n",
1778                                 p->tuner, p->type, p->frequency);
1779                 ret = ops->vidioc_s_frequency(file, fh, p);
1780                 break;
1781         }
1782         case VIDIOC_G_SLICED_VBI_CAP:
1783         {
1784                 struct v4l2_sliced_vbi_cap *p = arg;
1785 
1786                 if (!ops->vidioc_g_sliced_vbi_cap)
1787                         break;
1788 
1789                 /* Clear up to type, everything after type is zerod already */
1790                 memset(p, 0, offsetof(struct v4l2_sliced_vbi_cap, type));
1791 
1792                 dbgarg(cmd, "type=%s\n", prt_names(p->type, v4l2_type_names));
1793                 ret = ops->vidioc_g_sliced_vbi_cap(file, fh, p);
1794                 if (!ret)
1795                         dbgarg2("service_set=%d\n", p->service_set);
1796                 break;
1797         }
1798         case VIDIOC_LOG_STATUS:
1799         {
1800                 if (!ops->vidioc_log_status)
1801                         break;
1802                 ret = ops->vidioc_log_status(file, fh);
1803                 break;
1804         }
1805 #ifdef CONFIG_VIDEO_ADV_DEBUG
1806         case VIDIOC_DBG_G_REGISTER:
1807         {
1808                 struct v4l2_dbg_register *p = arg;
1809 
1810                 if (ops->vidioc_g_register) {
1811                         if (!capable(CAP_SYS_ADMIN))
1812                                 ret = -EPERM;
1813                         else
1814                                 ret = ops->vidioc_g_register(file, fh, p);
1815                 }
1816                 break;
1817         }
1818         case VIDIOC_DBG_S_REGISTER:
1819         {
1820                 struct v4l2_dbg_register *p = arg;
1821 
1822                 if (ops->vidioc_s_register) {
1823                         if (!capable(CAP_SYS_ADMIN))
1824                                 ret = -EPERM;
1825                         else
1826                                 ret = ops->vidioc_s_register(file, fh, p);
1827                 }
1828                 break;
1829         }
1830 #endif
1831         case VIDIOC_DBG_G_CHIP_IDENT:
1832         {
1833                 struct v4l2_dbg_chip_ident *p = arg;
1834 
1835                 if (!ops->vidioc_g_chip_ident)
1836                         break;
1837                 p->ident = V4L2_IDENT_NONE;
1838                 p->revision = 0;
1839                 ret = ops->vidioc_g_chip_ident(file, fh, p);
1840                 if (!ret)
1841                         dbgarg(cmd, "chip_ident=%u, revision=0x%x\n", p->ident, p->revision);
1842                 break;
1843         }
1844         case VIDIOC_S_HW_FREQ_SEEK:
1845         {
1846                 struct v4l2_hw_freq_seek *p = arg;
1847                 enum v4l2_tuner_type type;
1848 
1849                 if (!ops->vidioc_s_hw_freq_seek)
1850                         break;
1851                 if (ret_prio) {
1852                         ret = ret_prio;
1853                         break;
1854                 }
1855                 type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
1856                         V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1857                 dbgarg(cmd,
1858                         "tuner=%u, type=%u, seek_upward=%u, wrap_around=%u, spacing=%u\n",
1859                         p->tuner, p->type, p->seek_upward, p->wrap_around, p->spacing);
1860                 if (p->type != type)
1861                         ret = -EINVAL;
1862                 else
1863                         ret = ops->vidioc_s_hw_freq_seek(file, fh, p);
1864                 break;
1865         }
1866         case VIDIOC_ENUM_FRAMESIZES:
1867         {
1868                 struct v4l2_frmsizeenum *p = arg;
1869 
1870                 if (!ops->vidioc_enum_framesizes)
1871                         break;
1872 
1873                 ret = ops->vidioc_enum_framesizes(file, fh, p);
1874                 dbgarg(cmd,
1875                         "index=%d, pixelformat=%c%c%c%c, type=%d ",
1876                         p->index,
1877                         (p->pixel_format & 0xff),
1878                         (p->pixel_format >>  8) & 0xff,
1879                         (p->pixel_format >> 16) & 0xff,
1880                         (p->pixel_format >> 24) & 0xff,
1881                         p->type);
1882                 switch (p->type) {
1883                 case V4L2_FRMSIZE_TYPE_DISCRETE:
1884                         dbgarg3("width = %d, height=%d\n",
1885                                 p->discrete.width, p->discrete.height);
1886                         break;
1887                 case V4L2_FRMSIZE_TYPE_STEPWISE:
1888                         dbgarg3("min %dx%d, max %dx%d, step %dx%d\n",
1889                                 p->stepwise.min_width,  p->stepwise.min_height,
1890                                 p->stepwise.step_width, p->stepwise.step_height,
1891                                 p->stepwise.max_width,  p->stepwise.max_height);
1892                         break;
1893                 case V4L2_FRMSIZE_TYPE_CONTINUOUS:
1894                         dbgarg3("continuous\n");
1895                         break;
1896                 default:
1897                         dbgarg3("- Unknown type!\n");
1898                 }
1899 
1900                 break;
1901         }
1902         case VIDIOC_ENUM_FRAMEINTERVALS:
1903         {
1904                 struct v4l2_frmivalenum *p = arg;
1905 
1906                 if (!ops->vidioc_enum_frameintervals)
1907                         break;
1908 
1909                 ret = ops->vidioc_enum_frameintervals(file, fh, p);
1910                 dbgarg(cmd,
1911                         "index=%d, pixelformat=%d, width=%d, height=%d, type=%d ",
1912                         p->index, p->pixel_format,
1913                         p->width, p->height, p->type);
1914                 switch (p->type) {
1915                 case V4L2_FRMIVAL_TYPE_DISCRETE:
1916                         dbgarg2("fps=%d/%d\n",
1917                                 p->discrete.numerator,
1918                                 p->discrete.denominator);
1919                         break;
1920                 case V4L2_FRMIVAL_TYPE_STEPWISE:
1921                         dbgarg2("min=%d/%d, max=%d/%d, step=%d/%d\n",
1922                                 p->stepwise.min.numerator,
1923                                 p->stepwise.min.denominator,
1924                                 p->stepwise.max.numerator,
1925                                 p->stepwise.max.denominator,
1926                                 p->stepwise.step.numerator,
1927                                 p->stepwise.step.denominator);
1928                         break;
1929                 case V4L2_FRMIVAL_TYPE_CONTINUOUS:
1930                         dbgarg2("continuous\n");
1931                         break;
1932                 default:
1933                         dbgarg2("- Unknown type!\n");
1934                 }
1935                 break;
1936         }
1937         case VIDIOC_ENUM_DV_PRESETS:
1938         {
1939                 struct v4l2_dv_enum_preset *p = arg;
1940 
1941                 if (!ops->vidioc_enum_dv_presets)
1942                         break;
1943 
1944                 ret = ops->vidioc_enum_dv_presets(file, fh, p);
1945                 if (!ret)
1946                         dbgarg(cmd,
1947                                 "index=%d, preset=%d, name=%s, width=%d,"
1948                                 " height=%d ",
1949                                 p->index, p->preset, p->name, p->width,
1950                                 p->height);
1951                 break;
1952         }
1953         case VIDIOC_S_DV_PRESET:
1954         {
1955                 struct v4l2_dv_preset *p = arg;
1956 
1957                 if (!ops->vidioc_s_dv_preset)
1958                         break;
1959                 if (ret_prio) {
1960                         ret = ret_prio;
1961                         break;
1962                 }
1963 
1964                 dbgarg(cmd, "preset=%d\n", p->preset);
1965                 ret = ops->vidioc_s_dv_preset(file, fh, p);
1966                 break;
1967         }
1968         case VIDIOC_G_DV_PRESET:
1969         {
1970                 struct v4l2_dv_preset *p = arg;
1971 
1972                 if (!ops->vidioc_g_dv_preset)
1973                         break;
1974 
1975                 ret = ops->vidioc_g_dv_preset(file, fh, p);
1976                 if (!ret)
1977                         dbgarg(cmd, "preset=%d\n", p->preset);
1978                 break;
1979         }
1980         case VIDIOC_QUERY_DV_PRESET:
1981         {
1982                 struct v4l2_dv_preset *p = arg;
1983 
1984                 if (!ops->vidioc_query_dv_preset)
1985                         break;
1986 
1987                 ret = ops->vidioc_query_dv_preset(file, fh, p);
1988                 if (!ret)
1989                         dbgarg(cmd, "preset=%d\n", p->preset);
1990                 break;
1991         }
1992         case VIDIOC_S_DV_TIMINGS:
1993         {
1994                 struct v4l2_dv_timings *p = arg;
1995 
1996                 if (!ops->vidioc_s_dv_timings)
1997                         break;
1998                 if (ret_prio) {
1999                         ret = ret_prio;
2000                         break;
2001                 }
2002 
2003                 switch (p->type) {
2004                 case V4L2_DV_BT_656_1120:
2005                         dbgarg2("bt-656/1120:interlaced=%d, pixelclock=%lld,"
2006                                 " width=%d, height=%d, polarities=%x,"
2007                                 " hfrontporch=%d, hsync=%d, hbackporch=%d,"
2008                                 " vfrontporch=%d, vsync=%d, vbackporch=%d,"
2009                                 " il_vfrontporch=%d, il_vsync=%d,"
2010                                 " il_vbackporch=%d\n",
2011                                 p->bt.interlaced, p->bt.pixelclock,
2012                                 p->bt.width, p->bt.height, p->bt.polarities,
2013                                 p->bt.hfrontporch, p->bt.hsync,
2014                                 p->bt.hbackporch, p->bt.vfrontporch,
2015                                 p->bt.vsync, p->bt.vbackporch,
2016                                 p->bt.il_vfrontporch, p->bt.il_vsync,
2017                                 p->bt.il_vbackporch);
2018                         ret = ops->vidioc_s_dv_timings(file, fh, p);
2019                         break;
2020                 default:
2021                         dbgarg2("Unknown type %d!\n", p->type);
2022                         break;
2023                 }
2024                 break;
2025         }
2026         case VIDIOC_G_DV_TIMINGS:
2027         {
2028                 struct v4l2_dv_timings *p = arg;
2029 
2030                 if (!ops->vidioc_g_dv_timings)
2031                         break;
2032 
2033                 ret = ops->vidioc_g_dv_timings(file, fh, p);
2034                 if (!ret) {
2035                         switch (p->type) {
2036                         case V4L2_DV_BT_656_1120:
2037                                 dbgarg2("bt-656/1120:interlaced=%d,"
2038                                         " pixelclock=%lld,"
2039                                         " width=%d, height=%d, polarities=%x,"
2040                                         " hfrontporch=%d, hsync=%d,"
2041                                         " hbackporch=%d, vfrontporch=%d,"
2042                                         " vsync=%d, vbackporch=%d,"
2043                                         " il_vfrontporch=%d, il_vsync=%d,"
2044                                         " il_vbackporch=%d\n",
2045                                         p->bt.interlaced, p->bt.pixelclock,
2046                                         p->bt.width, p->bt.height,
2047                                         p->bt.polarities, p->bt.hfrontporch,
2048                                         p->bt.hsync, p->bt.hbackporch,
2049                                         p->bt.vfrontporch, p->bt.vsync,
2050                                         p->bt.vbackporch, p->bt.il_vfrontporch,
2051                                         p->bt.il_vsync, p->bt.il_vbackporch);
2052                                 break;
2053                         default:
2054                                 dbgarg2("Unknown type %d!\n", p->type);
2055                                 break;
2056                         }
2057                 }
2058                 break;
2059         }
2060         case VIDIOC_DQEVENT:
2061         {
2062                 struct v4l2_event *ev = arg;
2063 
2064                 if (!ops->vidioc_subscribe_event)
2065                         break;
2066 
2067                 ret = v4l2_event_dequeue(fh, ev, file->f_flags & O_NONBLOCK);
2068                 if (ret < 0) {
2069                         dbgarg(cmd, "no pending events?");
2070                         break;
2071                 }
2072                 dbgarg(cmd,
2073                        "pending=%d, type=0x%8.8x, sequence=%d, "
2074                        "timestamp=%lu.%9.9lu ",
2075                        ev->pending, ev->type, ev->sequence,
2076                        ev->timestamp.tv_sec, ev->timestamp.tv_nsec);
2077                 break;
2078         }
2079         case VIDIOC_SUBSCRIBE_EVENT:
2080         {
2081                 struct v4l2_event_subscription *sub = arg;
2082 
2083                 if (!ops->vidioc_subscribe_event)
2084                         break;
2085 
2086                 ret = ops->vidioc_subscribe_event(fh, sub);
2087                 if (ret < 0) {
2088                         dbgarg(cmd, "failed, ret=%ld", ret);
2089                         break;
2090                 }
2091                 dbgarg(cmd, "type=0x%8.8x", sub->type);
2092                 break;
2093         }
2094         case VIDIOC_UNSUBSCRIBE_EVENT:
2095         {
2096                 struct v4l2_event_subscription *sub = arg;
2097 
2098                 if (!ops->vidioc_unsubscribe_event)
2099                         break;
2100 
2101                 ret = ops->vidioc_unsubscribe_event(fh, sub);
2102                 if (ret < 0) {
2103                         dbgarg(cmd, "failed, ret=%ld", ret);
2104                         break;
2105                 }
2106                 dbgarg(cmd, "type=0x%8.8x", sub->type);
2107                 break;
2108         }
2109         case VIDIOC_CREATE_BUFS:
2110         {
2111                 struct v4l2_create_buffers *create = arg;
2112 
2113                 if (!ops->vidioc_create_bufs)
2114                         break;
2115                 if (ret_prio) {
2116                         ret = ret_prio;
2117                         break;
2118                 }
2119                 ret = check_fmt(ops, create->format.type);
2120                 if (ret)
2121                         break;
2122 
2123                 ret = ops->vidioc_create_bufs(file, fh, create);
2124 
2125                 dbgarg(cmd, "count=%d @ %d\n", create->count, create->index);
2126                 break;
2127         }
2128         case VIDIOC_PREPARE_BUF:
2129         {
2130                 struct v4l2_buffer *b = arg;
2131 
2132                 if (!ops->vidioc_prepare_buf)
2133                         break;
2134                 ret = check_fmt(ops, b->type);
2135                 if (ret)
2136                         break;
2137 
2138                 ret = ops->vidioc_prepare_buf(file, fh, b);
2139 
2140                 dbgarg(cmd, "index=%d", b->index);
2141                 break;
2142         }
2143         default:
2144                 if (!ops->vidioc_default)
2145                         break;
2146                 ret = ops->vidioc_default(file, fh, ret_prio >= 0, cmd, arg);
2147                 break;
2148         } /* switch */
2149 
2150         if (vfd->debug & V4L2_DEBUG_IOCTL_ARG) {
2151                 if (ret < 0) {
2152                         v4l_print_ioctl(vfd->name, cmd);
2153                         printk(KERN_CONT " error %ld\n", ret);
2154                 }
2155         }
2156 
2157         return ret;
2158 }
2159 
2160 /* In some cases, only a few fields are used as input, i.e. when the app sets
2161  * "index" and then the driver fills in the rest of the structure for the thing
2162  * with that index.  We only need to copy up the first non-input field.  */
2163 static unsigned long cmd_input_size(unsigned int cmd)
2164 {
2165         /* Size of structure up to and including 'field' */
2166 #define CMDINSIZE(cmd, type, field)                             \
2167         case VIDIOC_##cmd:                                      \
2168                 return offsetof(struct v4l2_##type, field) +    \
2169                         sizeof(((struct v4l2_##type *)0)->field);
2170 
2171         switch (cmd) {
2172                 CMDINSIZE(ENUM_FMT,             fmtdesc,        type);
2173                 CMDINSIZE(G_FMT,                format,         type);
2174                 CMDINSIZE(QUERYBUF,             buffer,         length);
2175                 CMDINSIZE(G_PARM,               streamparm,     type);
2176                 CMDINSIZE(ENUMSTD,              standard,       index);
2177                 CMDINSIZE(ENUMINPUT,            input,          index);
2178                 CMDINSIZE(G_CTRL,               control,        id);
2179                 CMDINSIZE(G_TUNER,              tuner,          index);
2180                 CMDINSIZE(QUERYCTRL,            queryctrl,      id);
2181                 CMDINSIZE(QUERYMENU,            querymenu,      index);
2182                 CMDINSIZE(ENUMOUTPUT,           output,         index);
2183                 CMDINSIZE(G_MODULATOR,          modulator,      index);
2184                 CMDINSIZE(G_FREQUENCY,          frequency,      tuner);
2185                 CMDINSIZE(CROPCAP,              cropcap,        type);
2186                 CMDINSIZE(G_CROP,               crop,           type);
2187                 CMDINSIZE(ENUMAUDIO,            audio,          index);
2188                 CMDINSIZE(ENUMAUDOUT,           audioout,       index);
2189                 CMDINSIZE(ENCODER_CMD,          encoder_cmd,    flags);
2190                 CMDINSIZE(TRY_ENCODER_CMD,      encoder_cmd,    flags);
2191                 CMDINSIZE(G_SLICED_VBI_CAP,     sliced_vbi_cap, type);
2192                 CMDINSIZE(ENUM_FRAMESIZES,      frmsizeenum,    pixel_format);
2193                 CMDINSIZE(ENUM_FRAMEINTERVALS,  frmivalenum,    height);
2194         default:
2195                 return _IOC_SIZE(cmd);
2196         }
2197 }
2198 
2199 static int check_array_args(unsigned int cmd, void *parg, size_t *array_size,
2200                             void * __user *user_ptr, void ***kernel_ptr)
2201 {
2202         int ret = 0;
2203 
2204         switch (cmd) {
2205         case VIDIOC_QUERYBUF:
2206         case VIDIOC_QBUF:
2207         case VIDIOC_DQBUF: {
2208                 struct v4l2_buffer *buf = parg;
2209 
2210                 if (V4L2_TYPE_IS_MULTIPLANAR(buf->type) && buf->length > 0) {
2211                         if (buf->length > VIDEO_MAX_PLANES) {
2212                                 ret = -EINVAL;
2213                                 break;
2214                         }
2215                         *user_ptr = (void __user *)buf->m.planes;
2216                         *kernel_ptr = (void *)&buf->m.planes;
2217                         *array_size = sizeof(struct v4l2_plane) * buf->length;
2218                         ret = 1;
2219                 }
2220                 break;
2221         }
2222 
2223         case VIDIOC_S_EXT_CTRLS:
2224         case VIDIOC_G_EXT_CTRLS:
2225         case VIDIOC_TRY_EXT_CTRLS: {
2226                 struct v4l2_ext_controls *ctrls = parg;
2227 
2228                 if (ctrls->count != 0) {
2229                         *user_ptr = (void __user *)ctrls->controls;
2230                         *kernel_ptr = (void *)&ctrls->controls;
2231                         *array_size = sizeof(struct v4l2_ext_control)
2232                                     * ctrls->count;
2233                         ret = 1;
2234                 }
2235                 break;
2236         }
2237         }
2238 
2239         return ret;
2240 }
2241 
2242 long
2243 video_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
2244                v4l2_kioctl func)
2245 {
2246         char    sbuf[128];
2247         void    *mbuf = NULL;
2248         void    *parg = (void *)arg;
2249         long    err  = -EINVAL;
2250         bool    has_array_args;
2251         size_t  array_size = 0;
2252         void __user *user_ptr = NULL;
2253         void    **kernel_ptr = NULL;
2254 
2255         /*  Copy arguments into temp kernel buffer  */
2256         if (_IOC_DIR(cmd) != _IOC_NONE) {
2257                 if (_IOC_SIZE(cmd) <= sizeof(sbuf)) {
2258                         parg = sbuf;
2259                 } else {
2260                         /* too big to allocate from stack */
2261                         mbuf = kmalloc(_IOC_SIZE(cmd), GFP_KERNEL);
2262                         if (NULL == mbuf)
2263                                 return -ENOMEM;
2264                         parg = mbuf;
2265                 }
2266 
2267                 err = -EFAULT;
2268                 if (_IOC_DIR(cmd) & _IOC_WRITE) {
2269                         unsigned long n = cmd_input_size(cmd);
2270 
2271                         if (copy_from_user(parg, (void __user *)arg, n))
2272                                 goto out;
2273 
2274                         /* zero out anything we don't copy from userspace */
2275                         if (n < _IOC_SIZE(cmd))
2276                                 memset((u8 *)parg + n, 0, _IOC_SIZE(cmd) - n);
2277                 } else {
2278                         /* read-only ioctl */
2279                         memset(parg, 0, _IOC_SIZE(cmd));
2280                 }
2281         }
2282 
2283         err = check_array_args(cmd, parg, &array_size, &user_ptr, &kernel_ptr);
2284         if (err < 0)
2285                 goto out;
2286         has_array_args = err;
2287 
2288         if (has_array_args) {
2289                 /*
2290                  * When adding new types of array args, make sure that the
2291                  * parent argument to ioctl (which contains the pointer to the
2292                  * array) fits into sbuf (so that mbuf will still remain
2293                  * unused up to here).
2294                  */
2295                 mbuf = kmalloc(array_size, GFP_KERNEL);
2296                 err = -ENOMEM;
2297                 if (NULL == mbuf)
2298                         goto out_array_args;
2299                 err = -EFAULT;
2300                 if (copy_from_user(mbuf, user_ptr, array_size))
2301                         goto out_array_args;
2302                 *kernel_ptr = mbuf;
2303         }
2304 
2305         /* Handles IOCTL */
2306         err = func(file, cmd, parg);
2307         if (err == -ENOIOCTLCMD)
2308                 err = -EINVAL;
2309 
2310         if (has_array_args) {
2311                 *kernel_ptr = user_ptr;
2312                 if (copy_to_user(user_ptr, mbuf, array_size))
2313                         err = -EFAULT;
2314                 goto out_array_args;
2315         }
2316         if (err < 0)
2317                 goto out;
2318 
2319 out_array_args:
2320         /*  Copy results into user buffer  */
2321         switch (_IOC_DIR(cmd)) {
2322         case _IOC_READ:
2323         case (_IOC_WRITE | _IOC_READ):
2324                 if (copy_to_user((void __user *)arg, parg, _IOC_SIZE(cmd)))
2325                         err = -EFAULT;
2326                 break;
2327         }
2328 
2329 out:
2330         kfree(mbuf);
2331         return err;
2332 }
2333 EXPORT_SYMBOL(video_usercopy);
2334 
2335 long video_ioctl2(struct file *file,
2336                unsigned int cmd, unsigned long arg)
2337 {
2338         return video_usercopy(file, cmd, arg, __video_do_ioctl);
2339 }
2340 EXPORT_SYMBOL(video_ioctl2);
2341 

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