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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 */
65int 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}
87EXPORT_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. */
93static 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
109static 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
119void 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}
154EXPORT_SYMBOL_GPL(v4l_bound_align_image);
155
156const void *
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}
184EXPORT_SYMBOL_GPL(__v4l2_find_nearest_size);
185
186int 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}
205EXPORT_SYMBOL_GPL(v4l2_g_parm_cap);
206
207int 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}
232EXPORT_SYMBOL_GPL(v4l2_s_parm_cap);
233
234const 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 }, .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 }, .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 }, .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 }, .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 }, .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 }, .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 }, .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 }, .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 }, .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 }, .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 }, .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 }, .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 }, .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 }, .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 }, .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 }, .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 }, .hdiv = 1, .vdiv = 1 },
255
256 /* YUV packed formats */
257 { .format = V4L2_PIX_FMT_YUYV, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
258 { .format = V4L2_PIX_FMT_YVYU, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
259 { .format = V4L2_PIX_FMT_UYVY, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
260 { .format = V4L2_PIX_FMT_VYUY, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 2, .vdiv = 1 },
261
262 /* YUV planar formats */
263 { .format = V4L2_PIX_FMT_NV12, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
264 { .format = V4L2_PIX_FMT_NV21, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
265 { .format = V4L2_PIX_FMT_NV16, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
266 { .format = V4L2_PIX_FMT_NV61, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
267 { .format = V4L2_PIX_FMT_NV24, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 1, .vdiv = 1 },
268 { .format = V4L2_PIX_FMT_NV42, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 1, .vdiv = 1 },
269 { .format = V4L2_PIX_FMT_P010, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 2, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
270
271 { .format = V4L2_PIX_FMT_YUV410, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 4, .vdiv = 4 },
272 { .format = V4L2_PIX_FMT_YVU410, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 4, .vdiv = 4 },
273 { .format = V4L2_PIX_FMT_YUV411P, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 4, .vdiv = 1 },
274 { .format = V4L2_PIX_FMT_YUV420, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 2 },
275 { .format = V4L2_PIX_FMT_YVU420, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 2 },
276 { .format = V4L2_PIX_FMT_YUV422P, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 1 },
277 { .format = V4L2_PIX_FMT_GREY, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
278
279 /* Tiled YUV formats */
280 { .format = V4L2_PIX_FMT_NV12_4L4, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
281 { .format = V4L2_PIX_FMT_P010_4L4, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 2, 4, 0, 0 }, .hdiv = 2, .vdiv = 2 },
282
283 /* YUV planar formats, non contiguous variant */
284 { .format = V4L2_PIX_FMT_YUV420M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 3, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 2 },
285 { .format = V4L2_PIX_FMT_YVU420M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 3, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 2 },
286 { .format = V4L2_PIX_FMT_YUV422M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 3, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 1 },
287 { .format = V4L2_PIX_FMT_YVU422M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 3, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 1 },
288 { .format = V4L2_PIX_FMT_YUV444M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 3, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 1, .vdiv = 1 },
289 { .format = V4L2_PIX_FMT_YVU444M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 3, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 1, .vdiv = 1 },
290
291 { .format = V4L2_PIX_FMT_NV12M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 2, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
292 { .format = V4L2_PIX_FMT_NV21M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 2, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
293 { .format = V4L2_PIX_FMT_NV16M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 2, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
294 { .format = V4L2_PIX_FMT_NV61M, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 2, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 1 },
295
296 /* Bayer RGB formats */
297 { .format = V4L2_PIX_FMT_SBGGR8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
298 { .format = V4L2_PIX_FMT_SGBRG8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
299 { .format = V4L2_PIX_FMT_SGRBG8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
300 { .format = V4L2_PIX_FMT_SRGGB8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
301 { .format = V4L2_PIX_FMT_SBGGR10, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
302 { .format = V4L2_PIX_FMT_SGBRG10, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
303 { .format = V4L2_PIX_FMT_SGRBG10, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
304 { .format = V4L2_PIX_FMT_SRGGB10, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
305 { .format = V4L2_PIX_FMT_SBGGR10ALAW8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
306 { .format = V4L2_PIX_FMT_SGBRG10ALAW8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
307 { .format = V4L2_PIX_FMT_SGRBG10ALAW8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
308 { .format = V4L2_PIX_FMT_SRGGB10ALAW8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
309 { .format = V4L2_PIX_FMT_SBGGR10DPCM8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
310 { .format = V4L2_PIX_FMT_SGBRG10DPCM8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
311 { .format = V4L2_PIX_FMT_SGRBG10DPCM8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
312 { .format = V4L2_PIX_FMT_SRGGB10DPCM8, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
313 { .format = V4L2_PIX_FMT_SBGGR12, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
314 { .format = V4L2_PIX_FMT_SGBRG12, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
315 { .format = V4L2_PIX_FMT_SGRBG12, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
316 { .format = V4L2_PIX_FMT_SRGGB12, .pixel_enc = V4L2_PIXEL_ENC_BAYER, .mem_planes = 1, .comp_planes = 1, .bpp = { 2, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
317 };
318 unsigned int i;
319
320 for (i = 0; i < ARRAY_SIZE(formats); ++i)
321 if (formats[i].format == format)
322 return &formats[i];
323 return NULL;
324}
325EXPORT_SYMBOL(v4l2_format_info);
326
327static inline unsigned int v4l2_format_block_width(const struct v4l2_format_info *info, int plane)
328{
329 if (!info->block_w[plane])
330 return 1;
331 return info->block_w[plane];
332}
333
334static inline unsigned int v4l2_format_block_height(const struct v4l2_format_info *info, int plane)
335{
336 if (!info->block_h[plane])
337 return 1;
338 return info->block_h[plane];
339}
340
341void v4l2_apply_frmsize_constraints(u32 *width, u32 *height,
342 const struct v4l2_frmsize_stepwise *frmsize)
343{
344 if (!frmsize)
345 return;
346
347 /*
348 * Clamp width/height to meet min/max constraints and round it up to
349 * macroblock alignment.
350 */
351 *width = clamp_roundup(*width, frmsize->min_width, frmsize->max_width,
352 frmsize->step_width);
353 *height = clamp_roundup(*height, frmsize->min_height, frmsize->max_height,
354 frmsize->step_height);
355}
356EXPORT_SYMBOL_GPL(v4l2_apply_frmsize_constraints);
357
358int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt,
359 u32 pixelformat, u32 width, u32 height)
360{
361 const struct v4l2_format_info *info;
362 struct v4l2_plane_pix_format *plane;
363 int i;
364
365 info = v4l2_format_info(pixelformat);
366 if (!info)
367 return -EINVAL;
368
369 pixfmt->width = width;
370 pixfmt->height = height;
371 pixfmt->pixelformat = pixelformat;
372 pixfmt->num_planes = info->mem_planes;
373
374 if (info->mem_planes == 1) {
375 plane = &pixfmt->plane_fmt[0];
376 plane->bytesperline = ALIGN(width, v4l2_format_block_width(info, 0)) * info->bpp[0];
377 plane->sizeimage = 0;
378
379 for (i = 0; i < info->comp_planes; i++) {
380 unsigned int hdiv = (i == 0) ? 1 : info->hdiv;
381 unsigned int vdiv = (i == 0) ? 1 : info->vdiv;
382 unsigned int aligned_width;
383 unsigned int aligned_height;
384
385 aligned_width = ALIGN(width, v4l2_format_block_width(info, i));
386 aligned_height = ALIGN(height, v4l2_format_block_height(info, i));
387
388 plane->sizeimage += info->bpp[i] *
389 DIV_ROUND_UP(aligned_width, hdiv) *
390 DIV_ROUND_UP(aligned_height, vdiv);
391 }
392 } else {
393 for (i = 0; i < info->comp_planes; i++) {
394 unsigned int hdiv = (i == 0) ? 1 : info->hdiv;
395 unsigned int vdiv = (i == 0) ? 1 : info->vdiv;
396 unsigned int aligned_width;
397 unsigned int aligned_height;
398
399 aligned_width = ALIGN(width, v4l2_format_block_width(info, i));
400 aligned_height = ALIGN(height, v4l2_format_block_height(info, i));
401
402 plane = &pixfmt->plane_fmt[i];
403 plane->bytesperline =
404 info->bpp[i] * DIV_ROUND_UP(aligned_width, hdiv);
405 plane->sizeimage =
406 plane->bytesperline * DIV_ROUND_UP(aligned_height, vdiv);
407 }
408 }
409 return 0;
410}
411EXPORT_SYMBOL_GPL(v4l2_fill_pixfmt_mp);
412
413int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, u32 pixelformat,
414 u32 width, u32 height)
415{
416 const struct v4l2_format_info *info;
417 int i;
418
419 info = v4l2_format_info(pixelformat);
420 if (!info)
421 return -EINVAL;
422
423 /* Single planar API cannot be used for multi plane formats. */
424 if (info->mem_planes > 1)
425 return -EINVAL;
426
427 pixfmt->width = width;
428 pixfmt->height = height;
429 pixfmt->pixelformat = pixelformat;
430 pixfmt->bytesperline = ALIGN(width, v4l2_format_block_width(info, 0)) * info->bpp[0];
431 pixfmt->sizeimage = 0;
432
433 for (i = 0; i < info->comp_planes; i++) {
434 unsigned int hdiv = (i == 0) ? 1 : info->hdiv;
435 unsigned int vdiv = (i == 0) ? 1 : info->vdiv;
436 unsigned int aligned_width;
437 unsigned int aligned_height;
438
439 aligned_width = ALIGN(width, v4l2_format_block_width(info, i));
440 aligned_height = ALIGN(height, v4l2_format_block_height(info, i));
441
442 pixfmt->sizeimage += info->bpp[i] *
443 DIV_ROUND_UP(aligned_width, hdiv) *
444 DIV_ROUND_UP(aligned_height, vdiv);
445 }
446 return 0;
447}
448EXPORT_SYMBOL_GPL(v4l2_fill_pixfmt);
449
450s64 v4l2_get_link_freq(struct v4l2_ctrl_handler *handler, unsigned int mul,
451 unsigned int div)
452{
453 struct v4l2_ctrl *ctrl;
454 s64 freq;
455
456 ctrl = v4l2_ctrl_find(handler, V4L2_CID_LINK_FREQ);
457 if (ctrl) {
458 struct v4l2_querymenu qm = { .id = V4L2_CID_LINK_FREQ };
459 int ret;
460
461 qm.index = v4l2_ctrl_g_ctrl(ctrl);
462
463 ret = v4l2_querymenu(handler, &qm);
464 if (ret)
465 return -ENOENT;
466
467 freq = qm.value;
468 } else {
469 if (!mul || !div)
470 return -ENOENT;
471
472 ctrl = v4l2_ctrl_find(handler, V4L2_CID_PIXEL_RATE);
473 if (!ctrl)
474 return -ENOENT;
475
476 freq = div_u64(v4l2_ctrl_g_ctrl_int64(ctrl) * mul, div);
477
478 pr_warn("%s: Link frequency estimated using pixel rate: result might be inaccurate\n",
479 __func__);
480 pr_warn("%s: Consider implementing support for V4L2_CID_LINK_FREQ in the transmitter driver\n",
481 __func__);
482 }
483
484 return freq > 0 ? freq : -EINVAL;
485}
486EXPORT_SYMBOL_GPL(v4l2_get_link_freq);
487
488/*
489 * Simplify a fraction using a simple continued fraction decomposition. The
490 * idea here is to convert fractions such as 333333/10000000 to 1/30 using
491 * 32 bit arithmetic only. The algorithm is not perfect and relies upon two
492 * arbitrary parameters to remove non-significative terms from the simple
493 * continued fraction decomposition. Using 8 and 333 for n_terms and threshold
494 * respectively seems to give nice results.
495 */
496void v4l2_simplify_fraction(u32 *numerator, u32 *denominator,
497 unsigned int n_terms, unsigned int threshold)
498{
499 u32 *an;
500 u32 x, y, r;
501 unsigned int i, n;
502
503 an = kmalloc_array(n_terms, sizeof(*an), GFP_KERNEL);
504 if (an == NULL)
505 return;
506
507 /*
508 * Convert the fraction to a simple continued fraction. See
509 * https://en.wikipedia.org/wiki/Continued_fraction
510 * Stop if the current term is bigger than or equal to the given
511 * threshold.
512 */
513 x = *numerator;
514 y = *denominator;
515
516 for (n = 0; n < n_terms && y != 0; ++n) {
517 an[n] = x / y;
518 if (an[n] >= threshold) {
519 if (n < 2)
520 n++;
521 break;
522 }
523
524 r = x - an[n] * y;
525 x = y;
526 y = r;
527 }
528
529 /* Expand the simple continued fraction back to an integer fraction. */
530 x = 0;
531 y = 1;
532
533 for (i = n; i > 0; --i) {
534 r = y;
535 y = an[i-1] * y + x;
536 x = r;
537 }
538
539 *numerator = y;
540 *denominator = x;
541 kfree(an);
542}
543EXPORT_SYMBOL_GPL(v4l2_simplify_fraction);
544
545/*
546 * Convert a fraction to a frame interval in 100ns multiples. The idea here is
547 * to compute numerator / denominator * 10000000 using 32 bit fixed point
548 * arithmetic only.
549 */
550u32 v4l2_fraction_to_interval(u32 numerator, u32 denominator)
551{
552 u32 multiplier;
553
554 /* Saturate the result if the operation would overflow. */
555 if (denominator == 0 ||
556 numerator/denominator >= ((u32)-1)/10000000)
557 return (u32)-1;
558
559 /*
560 * Divide both the denominator and the multiplier by two until
561 * numerator * multiplier doesn't overflow. If anyone knows a better
562 * algorithm please let me know.
563 */
564 multiplier = 10000000;
565 while (numerator > ((u32)-1)/multiplier) {
566 multiplier /= 2;
567 denominator /= 2;
568 }
569
570 return denominator ? numerator * multiplier / denominator : 0;
571}
572EXPORT_SYMBOL_GPL(v4l2_fraction_to_interval);