1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Video for Linux Two 4 * 5 * A generic video device interface for the LINUX operating system 6 * using a set of device structures/vectors for low level operations. 7 * 8 * This file replaces the videodev.c file that comes with the 9 * regular kernel distribution. 10 * 11 * Author: Bill Dirks <bill@thedirks.org> 12 * based on code by Alan Cox, <alan@cymru.net> 13 */ 14 15 /* 16 * Video capture interface for Linux 17 * 18 * A generic video device interface for the LINUX operating system 19 * using a set of device structures/vectors for low level operations. 20 * 21 * Author: Alan Cox, <alan@lxorguk.ukuu.org.uk> 22 * 23 * Fixes: 24 */ 25 26 /* 27 * Video4linux 1/2 integration by Justin Schoeman 28 * <justin@suntiger.ee.up.ac.za> 29 * 2.4 PROCFS support ported from 2.4 kernels by 30 * Iñaki García Etxebarria <garetxe@euskalnet.net> 31 * Makefile fix by "W. Michael Petullo" <mike@flyn.org> 32 * 2.4 devfs support ported from 2.4 kernels by 33 * Dan Merillat <dan@merillat.org> 34 * Added Gerd Knorrs v4l1 enhancements (Justin Schoeman) 35 */ 36 37 #include <linux/module.h> 38 #include <linux/types.h> 39 #include <linux/kernel.h> 40 #include <linux/mm.h> 41 #include <linux/string.h> 42 #include <linux/errno.h> 43 #include <linux/uaccess.h> 44 #include <asm/io.h> 45 #include <asm/div64.h> 46 #include <media/v4l2-common.h> 47 #include <media/v4l2-device.h> 48 #include <media/v4l2-ctrls.h> 49 50 #include <linux/videodev2.h> 51 52 /* 53 * 54 * V 4 L 2 D R I V E R H E L P E R A P I 55 * 56 */ 57 58 /* 59 * Video Standard Operations (contributed by Michael Schimek) 60 */ 61 62 /* Helper functions for control handling */ 63 64 /* Fill in a struct v4l2_queryctrl */ v4l2_ctrl_query_fill(struct v4l2_queryctrl * qctrl,s32 _min,s32 _max,s32 _step,s32 _def)65 int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, s32 _min, s32 _max, s32 _step, s32 _def) 66 { 67 const char *name; 68 s64 min = _min; 69 s64 max = _max; 70 u64 step = _step; 71 s64 def = _def; 72 73 v4l2_ctrl_fill(qctrl->id, &name, &qctrl->type, 74 &min, &max, &step, &def, &qctrl->flags); 75 76 if (name == NULL) 77 return -EINVAL; 78 79 qctrl->minimum = min; 80 qctrl->maximum = max; 81 qctrl->step = step; 82 qctrl->default_value = def; 83 qctrl->reserved[0] = qctrl->reserved[1] = 0; 84 strscpy(qctrl->name, name, sizeof(qctrl->name)); 85 return 0; 86 } 87 EXPORT_SYMBOL(v4l2_ctrl_query_fill); 88 89 /* Clamp x to be between min and max, aligned to a multiple of 2^align. min 90 * and max don't have to be aligned, but there must be at least one valid 91 * value. E.g., min=17,max=31,align=4 is not allowed as there are no multiples 92 * of 16 between 17 and 31. */ clamp_align(unsigned int x,unsigned int min,unsigned int max,unsigned int align)93 static unsigned int clamp_align(unsigned int x, unsigned int min, 94 unsigned int max, unsigned int align) 95 { 96 /* Bits that must be zero to be aligned */ 97 unsigned int mask = ~((1 << align) - 1); 98 99 /* Clamp to aligned min and max */ 100 x = clamp(x, (min + ~mask) & mask, max & mask); 101 102 /* Round to nearest aligned value */ 103 if (align) 104 x = (x + (1 << (align - 1))) & mask; 105 106 return x; 107 } 108 clamp_roundup(unsigned int x,unsigned int min,unsigned int max,unsigned int alignment)109 static unsigned int clamp_roundup(unsigned int x, unsigned int min, 110 unsigned int max, unsigned int alignment) 111 { 112 x = clamp(x, min, max); 113 if (alignment) 114 x = round_up(x, alignment); 115 116 return x; 117 } 118 v4l_bound_align_image(u32 * w,unsigned int wmin,unsigned int wmax,unsigned int walign,u32 * h,unsigned int hmin,unsigned int hmax,unsigned int halign,unsigned int salign)119 void v4l_bound_align_image(u32 *w, unsigned int wmin, unsigned int wmax, 120 unsigned int walign, 121 u32 *h, unsigned int hmin, unsigned int hmax, 122 unsigned int halign, unsigned int salign) 123 { 124 *w = clamp_align(*w, wmin, wmax, walign); 125 *h = clamp_align(*h, hmin, hmax, halign); 126 127 /* Usually we don't need to align the size and are done now. */ 128 if (!salign) 129 return; 130 131 /* How much alignment do we have? */ 132 walign = __ffs(*w); 133 halign = __ffs(*h); 134 /* Enough to satisfy the image alignment? */ 135 if (walign + halign < salign) { 136 /* Max walign where there is still a valid width */ 137 unsigned int wmaxa = __fls(wmax ^ (wmin - 1)); 138 /* Max halign where there is still a valid height */ 139 unsigned int hmaxa = __fls(hmax ^ (hmin - 1)); 140 141 /* up the smaller alignment until we have enough */ 142 do { 143 if (halign >= hmaxa || 144 (walign <= halign && walign < wmaxa)) { 145 *w = clamp_align(*w, wmin, wmax, walign + 1); 146 walign = __ffs(*w); 147 } else { 148 *h = clamp_align(*h, hmin, hmax, halign + 1); 149 halign = __ffs(*h); 150 } 151 } while (halign + walign < salign); 152 } 153 } 154 EXPORT_SYMBOL_GPL(v4l_bound_align_image); 155 156 const void * __v4l2_find_nearest_size(const void * array,size_t array_size,size_t entry_size,size_t width_offset,size_t height_offset,s32 width,s32 height)157 __v4l2_find_nearest_size(const void *array, size_t array_size, 158 size_t entry_size, size_t width_offset, 159 size_t height_offset, s32 width, s32 height) 160 { 161 u32 error, min_error = U32_MAX; 162 const void *best = NULL; 163 unsigned int i; 164 165 if (!array) 166 return NULL; 167 168 for (i = 0; i < array_size; i++, array += entry_size) { 169 const u32 *entry_width = array + width_offset; 170 const u32 *entry_height = array + height_offset; 171 172 error = abs(*entry_width - width) + abs(*entry_height - height); 173 if (error > min_error) 174 continue; 175 176 min_error = error; 177 best = array; 178 if (!error) 179 break; 180 } 181 182 return best; 183 } 184 EXPORT_SYMBOL_GPL(__v4l2_find_nearest_size); 185 v4l2_g_parm_cap(struct video_device * vdev,struct v4l2_subdev * sd,struct v4l2_streamparm * a)186 int v4l2_g_parm_cap(struct video_device *vdev, 187 struct v4l2_subdev *sd, struct v4l2_streamparm *a) 188 { 189 struct v4l2_subdev_frame_interval ival = { 0 }; 190 int ret; 191 192 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE && 193 a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) 194 return -EINVAL; 195 196 if (vdev->device_caps & V4L2_CAP_READWRITE) 197 a->parm.capture.readbuffers = 2; 198 if (v4l2_subdev_has_op(sd, video, g_frame_interval)) 199 a->parm.capture.capability = V4L2_CAP_TIMEPERFRAME; 200 ret = v4l2_subdev_call(sd, video, g_frame_interval, &ival); 201 if (!ret) 202 a->parm.capture.timeperframe = ival.interval; 203 return ret; 204 } 205 EXPORT_SYMBOL_GPL(v4l2_g_parm_cap); 206 v4l2_s_parm_cap(struct video_device * vdev,struct v4l2_subdev * sd,struct v4l2_streamparm * a)207 int v4l2_s_parm_cap(struct video_device *vdev, 208 struct v4l2_subdev *sd, struct v4l2_streamparm *a) 209 { 210 struct v4l2_subdev_frame_interval ival = { 211 .interval = a->parm.capture.timeperframe 212 }; 213 int ret; 214 215 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE && 216 a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) 217 return -EINVAL; 218 219 memset(&a->parm, 0, sizeof(a->parm)); 220 if (vdev->device_caps & V4L2_CAP_READWRITE) 221 a->parm.capture.readbuffers = 2; 222 else 223 a->parm.capture.readbuffers = 0; 224 225 if (v4l2_subdev_has_op(sd, video, g_frame_interval)) 226 a->parm.capture.capability = V4L2_CAP_TIMEPERFRAME; 227 ret = v4l2_subdev_call(sd, video, s_frame_interval, &ival); 228 if (!ret) 229 a->parm.capture.timeperframe = ival.interval; 230 return ret; 231 } 232 EXPORT_SYMBOL_GPL(v4l2_s_parm_cap); 233 v4l2_format_info(u32 format)234 const struct v4l2_format_info *v4l2_format_info(u32 format) 235 { 236 static const struct v4l2_format_info formats[] = { 237 /* RGB formats */ 238 { .format = V4L2_PIX_FMT_BGR24, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 3, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 239 { .format = V4L2_PIX_FMT_RGB24, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 3, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 240 { .format = V4L2_PIX_FMT_HSV24, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 3, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 241 { .format = V4L2_PIX_FMT_BGR32, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 242 { .format = V4L2_PIX_FMT_XBGR32, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 243 { .format = V4L2_PIX_FMT_BGRX32, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 244 { .format = V4L2_PIX_FMT_RGB32, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 245 { .format = V4L2_PIX_FMT_XRGB32, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 246 { .format = V4L2_PIX_FMT_RGBX32, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 247 { .format = V4L2_PIX_FMT_HSV32, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 248 { .format = V4L2_PIX_FMT_ARGB32, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 249 { .format = V4L2_PIX_FMT_RGBA32, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 250 { .format = V4L2_PIX_FMT_ABGR32, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 251 { .format = V4L2_PIX_FMT_BGRA32, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 252 { .format = V4L2_PIX_FMT_RGB565, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 253 { .format = V4L2_PIX_FMT_RGB555, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 254 { .format = V4L2_PIX_FMT_BGR666, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 255 { .format = V4L2_PIX_FMT_BGR48_12, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 6, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 256 { .format = V4L2_PIX_FMT_ABGR64_12, .pixel_enc = V4L2_PIXEL_ENC_RGB, .mem_planes = 1, .comp_planes = 1, .bpp = { 8, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 257 258 /* YUV packed formats */ 259 { .format = V4L2_PIX_FMT_YUYV, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 1 }, 260 { .format = V4L2_PIX_FMT_YVYU, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 1 }, 261 { .format = V4L2_PIX_FMT_UYVY, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 1 }, 262 { .format = V4L2_PIX_FMT_VYUY, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 1 }, 263 { .format = V4L2_PIX_FMT_Y212, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 4, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 1 }, 264 { .format = V4L2_PIX_FMT_YUV48_12, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 6, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 265 { .format = V4L2_PIX_FMT_MT2110T, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 2, .comp_planes = 2, .bpp = { 5, 10, 0, 0 }, .bpp_div = { 4, 4, 1, 1 }, .hdiv = 2, .vdiv = 2, 266 .block_w = { 16, 8, 0, 0 }, .block_h = { 32, 16, 0, 0 }}, 267 { .format = V4L2_PIX_FMT_MT2110R, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 2, .comp_planes = 2, .bpp = { 5, 10, 0, 0 }, .bpp_div = { 4, 4, 1, 1 }, .hdiv = 2, .vdiv = 2, 268 .block_w = { 16, 8, 0, 0 }, .block_h = { 32, 16, 0, 0 }}, 269 270 /* YUV planar formats */ 271 { .format = V4L2_PIX_FMT_NV12, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2 }, 272 { .format = V4L2_PIX_FMT_NV21, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2 }, 273 { .format = V4L2_PIX_FMT_NV16, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 1 }, 274 { .format = V4L2_PIX_FMT_NV61, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 1 }, 275 { .format = V4L2_PIX_FMT_NV24, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 276 { .format = V4L2_PIX_FMT_NV42, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 277 { .format = V4L2_PIX_FMT_P010, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 2, 2, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 1 }, 278 { .format = V4L2_PIX_FMT_P012, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 2, 4, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2 }, 279 280 { .format = V4L2_PIX_FMT_YUV410, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 4, .vdiv = 4 }, 281 { .format = V4L2_PIX_FMT_YVU410, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 4, .vdiv = 4 }, 282 { .format = V4L2_PIX_FMT_YUV411P, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 4, .vdiv = 1 }, 283 { .format = V4L2_PIX_FMT_YUV420, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2 }, 284 { .format = V4L2_PIX_FMT_YVU420, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2 }, 285 { .format = V4L2_PIX_FMT_YUV422P, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 1 }, 286 { .format = V4L2_PIX_FMT_GREY, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 287 288 /* Tiled YUV formats */ 289 { .format = V4L2_PIX_FMT_NV12_4L4, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2 }, 290 { .format = V4L2_PIX_FMT_NV15_4L4, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 5, 10, 0, 0 }, .bpp_div = { 4, 4, 1, 1 }, .hdiv = 2, .vdiv = 2, 291 .block_w = { 4, 2, 0, 0 }, .block_h = { 1, 1, 0, 0 }}, 292 { .format = V4L2_PIX_FMT_P010_4L4, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 2, 4, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2 }, 293 294 /* YUV planar formats, non contiguous variant */ 295 { .format = V4L2_PIX_FMT_YUV420M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 3, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2 }, 296 { .format = V4L2_PIX_FMT_YVU420M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 3, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2 }, 297 { .format = V4L2_PIX_FMT_YUV422M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 3, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 1 }, 298 { .format = V4L2_PIX_FMT_YVU422M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 3, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 1 }, 299 { .format = V4L2_PIX_FMT_YUV444M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 3, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 300 { .format = V4L2_PIX_FMT_YVU444M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 3, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 301 302 { .format = V4L2_PIX_FMT_NV12M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 2, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2 }, 303 { .format = V4L2_PIX_FMT_NV21M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 2, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2 }, 304 { .format = V4L2_PIX_FMT_NV16M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 2, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 1 }, 305 { .format = V4L2_PIX_FMT_NV61M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 2, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 1 }, 306 { .format = V4L2_PIX_FMT_P012M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 2, .comp_planes = 2, .bpp = { 2, 4, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 2, .vdiv = 2 }, 307 308 /* Bayer RGB formats */ 309 { .format = V4L2_PIX_FMT_SBGGR8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 310 { .format = V4L2_PIX_FMT_SGBRG8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 311 { .format = V4L2_PIX_FMT_SGRBG8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 312 { .format = V4L2_PIX_FMT_SRGGB8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 313 { .format = V4L2_PIX_FMT_SBGGR10, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 314 { .format = V4L2_PIX_FMT_SGBRG10, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 315 { .format = V4L2_PIX_FMT_SGRBG10, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 316 { .format = V4L2_PIX_FMT_SRGGB10, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 317 { .format = V4L2_PIX_FMT_SBGGR10ALAW8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 318 { .format = V4L2_PIX_FMT_SGBRG10ALAW8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 319 { .format = V4L2_PIX_FMT_SGRBG10ALAW8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 320 { .format = V4L2_PIX_FMT_SRGGB10ALAW8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 321 { .format = V4L2_PIX_FMT_SBGGR10DPCM8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 322 { .format = V4L2_PIX_FMT_SGBRG10DPCM8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 323 { .format = V4L2_PIX_FMT_SGRBG10DPCM8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 324 { .format = V4L2_PIX_FMT_SRGGB10DPCM8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 325 { .format = V4L2_PIX_FMT_SBGGR12, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 326 { .format = V4L2_PIX_FMT_SGBRG12, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 327 { .format = V4L2_PIX_FMT_SGRBG12, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 328 { .format = V4L2_PIX_FMT_SRGGB12, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .bpp_div = { 1, 1, 1, 1 }, .hdiv = 1, .vdiv = 1 }, 329 }; 330 unsigned int i; 331 332 for (i = 0; i < ARRAY_SIZE(formats); ++i) 333 if (formats[i].format == format) 334 return &formats[i]; 335 return NULL; 336 } 337 EXPORT_SYMBOL(v4l2_format_info); 338 v4l2_format_block_width(const struct v4l2_format_info * info,int plane)339 static inline unsigned int v4l2_format_block_width(const struct v4l2_format_info *info, int plane) 340 { 341 if (!info->block_w[plane]) 342 return 1; 343 return info->block_w[plane]; 344 } 345 v4l2_format_block_height(const struct v4l2_format_info * info,int plane)346 static inline unsigned int v4l2_format_block_height(const struct v4l2_format_info *info, int plane) 347 { 348 if (!info->block_h[plane]) 349 return 1; 350 return info->block_h[plane]; 351 } 352 v4l2_apply_frmsize_constraints(u32 * width,u32 * height,const struct v4l2_frmsize_stepwise * frmsize)353 void v4l2_apply_frmsize_constraints(u32 *width, u32 *height, 354 const struct v4l2_frmsize_stepwise *frmsize) 355 { 356 if (!frmsize) 357 return; 358 359 /* 360 * Clamp width/height to meet min/max constraints and round it up to 361 * macroblock alignment. 362 */ 363 *width = clamp_roundup(*width, frmsize->min_width, frmsize->max_width, 364 frmsize->step_width); 365 *height = clamp_roundup(*height, frmsize->min_height, frmsize->max_height, 366 frmsize->step_height); 367 } 368 EXPORT_SYMBOL_GPL(v4l2_apply_frmsize_constraints); 369 v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane * pixfmt,u32 pixelformat,u32 width,u32 height)370 int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, 371 u32 pixelformat, u32 width, u32 height) 372 { 373 const struct v4l2_format_info *info; 374 struct v4l2_plane_pix_format *plane; 375 int i; 376 377 info = v4l2_format_info(pixelformat); 378 if (!info) 379 return -EINVAL; 380 381 pixfmt->width = width; 382 pixfmt->height = height; 383 pixfmt->pixelformat = pixelformat; 384 pixfmt->num_planes = info->mem_planes; 385 386 if (info->mem_planes == 1) { 387 plane = &pixfmt->plane_fmt[0]; 388 plane->bytesperline = ALIGN(width, v4l2_format_block_width(info, 0)) * info->bpp[0] / info->bpp_div[0]; 389 plane->sizeimage = 0; 390 391 for (i = 0; i < info->comp_planes; i++) { 392 unsigned int hdiv = (i == 0) ? 1 : info->hdiv; 393 unsigned int vdiv = (i == 0) ? 1 : info->vdiv; 394 unsigned int aligned_width; 395 unsigned int aligned_height; 396 397 aligned_width = ALIGN(width, v4l2_format_block_width(info, i)); 398 aligned_height = ALIGN(height, v4l2_format_block_height(info, i)); 399 400 plane->sizeimage += info->bpp[i] * 401 DIV_ROUND_UP(aligned_width, hdiv) * 402 DIV_ROUND_UP(aligned_height, vdiv) / info->bpp_div[i]; 403 } 404 } else { 405 for (i = 0; i < info->comp_planes; i++) { 406 unsigned int hdiv = (i == 0) ? 1 : info->hdiv; 407 unsigned int vdiv = (i == 0) ? 1 : info->vdiv; 408 unsigned int aligned_width; 409 unsigned int aligned_height; 410 411 aligned_width = ALIGN(width, v4l2_format_block_width(info, i)); 412 aligned_height = ALIGN(height, v4l2_format_block_height(info, i)); 413 414 plane = &pixfmt->plane_fmt[i]; 415 plane->bytesperline = 416 info->bpp[i] * DIV_ROUND_UP(aligned_width, hdiv) / info->bpp_div[i]; 417 plane->sizeimage = 418 plane->bytesperline * DIV_ROUND_UP(aligned_height, vdiv); 419 } 420 } 421 return 0; 422 } 423 EXPORT_SYMBOL_GPL(v4l2_fill_pixfmt_mp); 424 v4l2_fill_pixfmt(struct v4l2_pix_format * pixfmt,u32 pixelformat,u32 width,u32 height)425 int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, u32 pixelformat, 426 u32 width, u32 height) 427 { 428 const struct v4l2_format_info *info; 429 int i; 430 431 info = v4l2_format_info(pixelformat); 432 if (!info) 433 return -EINVAL; 434 435 /* Single planar API cannot be used for multi plane formats. */ 436 if (info->mem_planes > 1) 437 return -EINVAL; 438 439 pixfmt->width = width; 440 pixfmt->height = height; 441 pixfmt->pixelformat = pixelformat; 442 pixfmt->bytesperline = ALIGN(width, v4l2_format_block_width(info, 0)) * info->bpp[0] / info->bpp_div[0]; 443 pixfmt->sizeimage = 0; 444 445 for (i = 0; i < info->comp_planes; i++) { 446 unsigned int hdiv = (i == 0) ? 1 : info->hdiv; 447 unsigned int vdiv = (i == 0) ? 1 : info->vdiv; 448 unsigned int aligned_width; 449 unsigned int aligned_height; 450 451 aligned_width = ALIGN(width, v4l2_format_block_width(info, i)); 452 aligned_height = ALIGN(height, v4l2_format_block_height(info, i)); 453 454 pixfmt->sizeimage += info->bpp[i] * 455 DIV_ROUND_UP(aligned_width, hdiv) * 456 DIV_ROUND_UP(aligned_height, vdiv) / info->bpp_div[i]; 457 } 458 return 0; 459 } 460 EXPORT_SYMBOL_GPL(v4l2_fill_pixfmt); 461 v4l2_get_link_freq(struct v4l2_ctrl_handler * handler,unsigned int mul,unsigned int div)462 s64 v4l2_get_link_freq(struct v4l2_ctrl_handler *handler, unsigned int mul, 463 unsigned int div) 464 { 465 struct v4l2_ctrl *ctrl; 466 s64 freq; 467 468 ctrl = v4l2_ctrl_find(handler, V4L2_CID_LINK_FREQ); 469 if (ctrl) { 470 struct v4l2_querymenu qm = { .id = V4L2_CID_LINK_FREQ }; 471 int ret; 472 473 qm.index = v4l2_ctrl_g_ctrl(ctrl); 474 475 ret = v4l2_querymenu(handler, &qm); 476 if (ret) 477 return -ENOENT; 478 479 freq = qm.value; 480 } else { 481 if (!mul || !div) 482 return -ENOENT; 483 484 ctrl = v4l2_ctrl_find(handler, V4L2_CID_PIXEL_RATE); 485 if (!ctrl) 486 return -ENOENT; 487 488 freq = div_u64(v4l2_ctrl_g_ctrl_int64(ctrl) * mul, div); 489 490 pr_warn("%s: Link frequency estimated using pixel rate: result might be inaccurate\n", 491 __func__); 492 pr_warn("%s: Consider implementing support for V4L2_CID_LINK_FREQ in the transmitter driver\n", 493 __func__); 494 } 495 496 return freq > 0 ? freq : -EINVAL; 497 } 498 EXPORT_SYMBOL_GPL(v4l2_get_link_freq); 499 500 /* 501 * Simplify a fraction using a simple continued fraction decomposition. The 502 * idea here is to convert fractions such as 333333/10000000 to 1/30 using 503 * 32 bit arithmetic only. The algorithm is not perfect and relies upon two 504 * arbitrary parameters to remove non-significative terms from the simple 505 * continued fraction decomposition. Using 8 and 333 for n_terms and threshold 506 * respectively seems to give nice results. 507 */ v4l2_simplify_fraction(u32 * numerator,u32 * denominator,unsigned int n_terms,unsigned int threshold)508 void v4l2_simplify_fraction(u32 *numerator, u32 *denominator, 509 unsigned int n_terms, unsigned int threshold) 510 { 511 u32 *an; 512 u32 x, y, r; 513 unsigned int i, n; 514 515 an = kmalloc_array(n_terms, sizeof(*an), GFP_KERNEL); 516 if (an == NULL) 517 return; 518 519 /* 520 * Convert the fraction to a simple continued fraction. See 521 * https://en.wikipedia.org/wiki/Continued_fraction 522 * Stop if the current term is bigger than or equal to the given 523 * threshold. 524 */ 525 x = *numerator; 526 y = *denominator; 527 528 for (n = 0; n < n_terms && y != 0; ++n) { 529 an[n] = x / y; 530 if (an[n] >= threshold) { 531 if (n < 2) 532 n++; 533 break; 534 } 535 536 r = x - an[n] * y; 537 x = y; 538 y = r; 539 } 540 541 /* Expand the simple continued fraction back to an integer fraction. */ 542 x = 0; 543 y = 1; 544 545 for (i = n; i > 0; --i) { 546 r = y; 547 y = an[i-1] * y + x; 548 x = r; 549 } 550 551 *numerator = y; 552 *denominator = x; 553 kfree(an); 554 } 555 EXPORT_SYMBOL_GPL(v4l2_simplify_fraction); 556 557 /* 558 * Convert a fraction to a frame interval in 100ns multiples. The idea here is 559 * to compute numerator / denominator * 10000000 using 32 bit fixed point 560 * arithmetic only. 561 */ v4l2_fraction_to_interval(u32 numerator,u32 denominator)562 u32 v4l2_fraction_to_interval(u32 numerator, u32 denominator) 563 { 564 u32 multiplier; 565 566 /* Saturate the result if the operation would overflow. */ 567 if (denominator == 0 || 568 numerator/denominator >= ((u32)-1)/10000000) 569 return (u32)-1; 570 571 /* 572 * Divide both the denominator and the multiplier by two until 573 * numerator * multiplier doesn't overflow. If anyone knows a better 574 * algorithm please let me know. 575 */ 576 multiplier = 10000000; 577 while (numerator > ((u32)-1)/multiplier) { 578 multiplier /= 2; 579 denominator /= 2; 580 } 581 582 return denominator ? numerator * multiplier / denominator : 0; 583 } 584 EXPORT_SYMBOL_GPL(v4l2_fraction_to_interval); 585