1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 v4l2 common internal API header 4 5 This header contains internal shared ioctl definitions for use by the 6 internal low-level v4l2 drivers. 7 Each ioctl begins with VIDIOC_INT_ to clearly mark that it is an internal 8 define, 9 10 Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl> 11 12 */ 13 14 #ifndef V4L2_COMMON_H_ 15 #define V4L2_COMMON_H_ 16 17 #include <linux/time.h> 18 #include <media/v4l2-dev.h> 19 20 /* Common printk constructs for v4l-i2c drivers. These macros create a unique 21 prefix consisting of the driver name, the adapter number and the i2c 22 address. */ 23 #define v4l_printk(level, name, adapter, addr, fmt, arg...) \ 24 printk(level "%s %d-%04x: " fmt, name, i2c_adapter_id(adapter), addr , ## arg) 25 26 #define v4l_client_printk(level, client, fmt, arg...) \ 27 v4l_printk(level, (client)->dev.driver->name, (client)->adapter, \ 28 (client)->addr, fmt , ## arg) 29 30 #define v4l_err(client, fmt, arg...) \ 31 v4l_client_printk(KERN_ERR, client, fmt , ## arg) 32 33 #define v4l_warn(client, fmt, arg...) \ 34 v4l_client_printk(KERN_WARNING, client, fmt , ## arg) 35 36 #define v4l_info(client, fmt, arg...) \ 37 v4l_client_printk(KERN_INFO, client, fmt , ## arg) 38 39 /* These three macros assume that the debug level is set with a module 40 parameter called 'debug'. */ 41 #define v4l_dbg(level, debug, client, fmt, arg...) \ 42 do { \ 43 if (debug >= (level)) \ 44 v4l_client_printk(KERN_DEBUG, client, fmt , ## arg); \ 45 } while (0) 46 47 /* Add a version of v4l_dbg to be used on drivers using dev_foo() macros */ 48 #define dev_dbg_lvl(__dev, __level, __debug, __fmt, __arg...) \ 49 do { \ 50 if (__debug >= (__level)) \ 51 dev_printk(KERN_DEBUG, __dev, __fmt, ##__arg); \ 52 } while (0) 53 54 /* ------------------------------------------------------------------------- */ 55 56 /* These printk constructs can be used with v4l2_device and v4l2_subdev */ 57 #define v4l2_printk(level, dev, fmt, arg...) \ 58 printk(level "%s: " fmt, (dev)->name , ## arg) 59 60 #define v4l2_err(dev, fmt, arg...) \ 61 v4l2_printk(KERN_ERR, dev, fmt , ## arg) 62 63 #define v4l2_warn(dev, fmt, arg...) \ 64 v4l2_printk(KERN_WARNING, dev, fmt , ## arg) 65 66 #define v4l2_info(dev, fmt, arg...) \ 67 v4l2_printk(KERN_INFO, dev, fmt , ## arg) 68 69 /* These three macros assume that the debug level is set with a module 70 parameter called 'debug'. */ 71 #define v4l2_dbg(level, debug, dev, fmt, arg...) \ 72 do { \ 73 if (debug >= (level)) \ 74 v4l2_printk(KERN_DEBUG, dev, fmt , ## arg); \ 75 } while (0) 76 77 /** 78 * v4l2_ctrl_query_fill- Fill in a struct v4l2_queryctrl 79 * 80 * @qctrl: pointer to the &struct v4l2_queryctrl to be filled 81 * @min: minimum value for the control 82 * @max: maximum value for the control 83 * @step: control step 84 * @def: default value for the control 85 * 86 * Fills the &struct v4l2_queryctrl fields for the query control. 87 * 88 * .. note:: 89 * 90 * This function assumes that the @qctrl->id field is filled. 91 * 92 * Returns -EINVAL if the control is not known by the V4L2 core, 0 on success. 93 */ 94 95 int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, 96 s32 min, s32 max, s32 step, s32 def); 97 98 /* ------------------------------------------------------------------------- */ 99 100 struct v4l2_device; 101 struct v4l2_subdev; 102 struct v4l2_subdev_ops; 103 104 /* I2C Helper functions */ 105 #include <linux/i2c.h> 106 107 /** 108 * enum v4l2_i2c_tuner_type - specifies the range of tuner address that 109 * should be used when seeking for I2C devices. 110 * 111 * @ADDRS_RADIO: Radio tuner addresses. 112 * Represent the following I2C addresses: 113 * 0x10 (if compiled with tea5761 support) 114 * and 0x60. 115 * @ADDRS_DEMOD: Demod tuner addresses. 116 * Represent the following I2C addresses: 117 * 0x42, 0x43, 0x4a and 0x4b. 118 * @ADDRS_TV: TV tuner addresses. 119 * Represent the following I2C addresses: 120 * 0x42, 0x43, 0x4a, 0x4b, 0x60, 0x61, 0x62, 121 * 0x63 and 0x64. 122 * @ADDRS_TV_WITH_DEMOD: TV tuner addresses if demod is present, this 123 * excludes addresses used by the demodulator 124 * from the list of candidates. 125 * Represent the following I2C addresses: 126 * 0x60, 0x61, 0x62, 0x63 and 0x64. 127 * 128 * NOTE: All I2C addresses above use the 7-bit notation. 129 */ 130 enum v4l2_i2c_tuner_type { 131 ADDRS_RADIO, 132 ADDRS_DEMOD, 133 ADDRS_TV, 134 ADDRS_TV_WITH_DEMOD, 135 }; 136 137 #if defined(CONFIG_VIDEO_V4L2_I2C) 138 139 /** 140 * v4l2_i2c_new_subdev - Load an i2c module and return an initialized 141 * &struct v4l2_subdev. 142 * 143 * @v4l2_dev: pointer to &struct v4l2_device 144 * @adapter: pointer to struct i2c_adapter 145 * @client_type: name of the chip that's on the adapter. 146 * @addr: I2C address. If zero, it will use @probe_addrs 147 * @probe_addrs: array with a list of address. The last entry at such 148 * array should be %I2C_CLIENT_END. 149 * 150 * returns a &struct v4l2_subdev pointer. 151 */ 152 struct v4l2_subdev *v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev, 153 struct i2c_adapter *adapter, const char *client_type, 154 u8 addr, const unsigned short *probe_addrs); 155 156 /** 157 * v4l2_i2c_new_subdev_board - Load an i2c module and return an initialized 158 * &struct v4l2_subdev. 159 * 160 * @v4l2_dev: pointer to &struct v4l2_device 161 * @adapter: pointer to struct i2c_adapter 162 * @info: pointer to struct i2c_board_info used to replace the irq, 163 * platform_data and addr arguments. 164 * @probe_addrs: array with a list of address. The last entry at such 165 * array should be %I2C_CLIENT_END. 166 * 167 * returns a &struct v4l2_subdev pointer. 168 */ 169 struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev, 170 struct i2c_adapter *adapter, struct i2c_board_info *info, 171 const unsigned short *probe_addrs); 172 173 /** 174 * v4l2_i2c_subdev_set_name - Set name for an I²C sub-device 175 * 176 * @sd: pointer to &struct v4l2_subdev 177 * @client: pointer to struct i2c_client 178 * @devname: the name of the device; if NULL, the I²C device's name will be used 179 * @postfix: sub-device specific string to put right after the I²C device name; 180 * may be NULL 181 */ 182 void v4l2_i2c_subdev_set_name(struct v4l2_subdev *sd, struct i2c_client *client, 183 const char *devname, const char *postfix); 184 185 /** 186 * v4l2_i2c_subdev_init - Initializes a &struct v4l2_subdev with data from 187 * an i2c_client struct. 188 * 189 * @sd: pointer to &struct v4l2_subdev 190 * @client: pointer to struct i2c_client 191 * @ops: pointer to &struct v4l2_subdev_ops 192 */ 193 void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client, 194 const struct v4l2_subdev_ops *ops); 195 196 /** 197 * v4l2_i2c_subdev_addr - returns i2c client address of &struct v4l2_subdev. 198 * 199 * @sd: pointer to &struct v4l2_subdev 200 * 201 * Returns the address of an I2C sub-device 202 */ 203 unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd); 204 205 /** 206 * v4l2_i2c_tuner_addrs - Return a list of I2C tuner addresses to probe. 207 * 208 * @type: type of the tuner to seek, as defined by 209 * &enum v4l2_i2c_tuner_type. 210 * 211 * NOTE: Use only if the tuner addresses are unknown. 212 */ 213 const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type); 214 215 /** 216 * v4l2_i2c_subdev_unregister - Unregister a v4l2_subdev 217 * 218 * @sd: pointer to &struct v4l2_subdev 219 */ 220 void v4l2_i2c_subdev_unregister(struct v4l2_subdev *sd); 221 222 #else 223 224 static inline struct v4l2_subdev * 225 v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev, 226 struct i2c_adapter *adapter, const char *client_type, 227 u8 addr, const unsigned short *probe_addrs) 228 { 229 return NULL; 230 } 231 232 static inline struct v4l2_subdev * 233 v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev, 234 struct i2c_adapter *adapter, struct i2c_board_info *info, 235 const unsigned short *probe_addrs) 236 { 237 return NULL; 238 } 239 240 static inline void 241 v4l2_i2c_subdev_set_name(struct v4l2_subdev *sd, struct i2c_client *client, 242 const char *devname, const char *postfix) 243 {} 244 245 static inline void 246 v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client, 247 const struct v4l2_subdev_ops *ops) 248 {} 249 250 static inline unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd) 251 { 252 return I2C_CLIENT_END; 253 } 254 255 static inline const unsigned short * 256 v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type) 257 { 258 return NULL; 259 } 260 261 static inline void v4l2_i2c_subdev_unregister(struct v4l2_subdev *sd) 262 {} 263 264 #endif 265 266 /* ------------------------------------------------------------------------- */ 267 268 /* SPI Helper functions */ 269 270 #include <linux/spi/spi.h> 271 272 #if defined(CONFIG_SPI) 273 274 /** 275 * v4l2_spi_new_subdev - Load an spi module and return an initialized 276 * &struct v4l2_subdev. 277 * 278 * 279 * @v4l2_dev: pointer to &struct v4l2_device. 280 * @master: pointer to struct spi_master. 281 * @info: pointer to struct spi_board_info. 282 * 283 * returns a &struct v4l2_subdev pointer. 284 */ 285 struct v4l2_subdev *v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev, 286 struct spi_master *master, struct spi_board_info *info); 287 288 /** 289 * v4l2_spi_subdev_init - Initialize a v4l2_subdev with data from an 290 * spi_device struct. 291 * 292 * @sd: pointer to &struct v4l2_subdev 293 * @spi: pointer to struct spi_device. 294 * @ops: pointer to &struct v4l2_subdev_ops 295 */ 296 void v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi, 297 const struct v4l2_subdev_ops *ops); 298 299 /** 300 * v4l2_spi_subdev_unregister - Unregister a v4l2_subdev 301 * 302 * @sd: pointer to &struct v4l2_subdev 303 */ 304 void v4l2_spi_subdev_unregister(struct v4l2_subdev *sd); 305 306 #else 307 308 static inline struct v4l2_subdev * 309 v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev, 310 struct spi_master *master, struct spi_board_info *info) 311 { 312 return NULL; 313 } 314 315 static inline void 316 v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi, 317 const struct v4l2_subdev_ops *ops) 318 {} 319 320 static inline void v4l2_spi_subdev_unregister(struct v4l2_subdev *sd) 321 {} 322 #endif 323 324 /* ------------------------------------------------------------------------- */ 325 326 /* 327 * FIXME: these remaining ioctls/structs should be removed as well, but they 328 * are still used in tuner-simple.c (TUNER_SET_CONFIG) and cx18/ivtv (RESET). 329 * To remove these ioctls some more cleanup is needed in those modules. 330 * 331 * It doesn't make much sense on documenting them, as what we really want is 332 * to get rid of them. 333 */ 334 335 /* s_config */ 336 struct v4l2_priv_tun_config { 337 int tuner; 338 void *priv; 339 }; 340 #define TUNER_SET_CONFIG _IOW('d', 92, struct v4l2_priv_tun_config) 341 342 #define VIDIOC_INT_RESET _IOW ('d', 102, u32) 343 344 /* ------------------------------------------------------------------------- */ 345 346 /* Miscellaneous helper functions */ 347 348 /** 349 * v4l_bound_align_image - adjust video dimensions according to 350 * a given constraints. 351 * 352 * @width: pointer to width that will be adjusted if needed. 353 * @wmin: minimum width. 354 * @wmax: maximum width. 355 * @walign: least significant bit on width. 356 * @height: pointer to height that will be adjusted if needed. 357 * @hmin: minimum height. 358 * @hmax: maximum height. 359 * @halign: least significant bit on height. 360 * @salign: least significant bit for the image size (e. g. 361 * :math:`width * height`). 362 * 363 * Clip an image to have @width between @wmin and @wmax, and @height between 364 * @hmin and @hmax, inclusive. 365 * 366 * Additionally, the @width will be a multiple of :math:`2^{walign}`, 367 * the @height will be a multiple of :math:`2^{halign}`, and the overall 368 * size :math:`width * height` will be a multiple of :math:`2^{salign}`. 369 * 370 * .. note:: 371 * 372 * #. The clipping rectangle may be shrunk or enlarged to fit the alignment 373 * constraints. 374 * #. @wmax must not be smaller than @wmin. 375 * #. @hmax must not be smaller than @hmin. 376 * #. The alignments must not be so high there are no possible image 377 * sizes within the allowed bounds. 378 * #. @wmin and @hmin must be at least 1 (don't use 0). 379 * #. For @walign, @halign and @salign, if you don't care about a certain 380 * alignment, specify ``0``, as :math:`2^0 = 1` and one byte alignment 381 * is equivalent to no alignment. 382 * #. If you only want to adjust downward, specify a maximum that's the 383 * same as the initial value. 384 */ 385 void v4l_bound_align_image(unsigned int *width, unsigned int wmin, 386 unsigned int wmax, unsigned int walign, 387 unsigned int *height, unsigned int hmin, 388 unsigned int hmax, unsigned int halign, 389 unsigned int salign); 390 391 /** 392 * v4l2_find_nearest_size - Find the nearest size among a discrete 393 * set of resolutions contained in an array of a driver specific struct. 394 * 395 * @array: a driver specific array of image sizes 396 * @array_size: the length of the driver specific array of image sizes 397 * @width_field: the name of the width field in the driver specific struct 398 * @height_field: the name of the height field in the driver specific struct 399 * @width: desired width. 400 * @height: desired height. 401 * 402 * Finds the closest resolution to minimize the width and height differences 403 * between what requested and the supported resolutions. The size of the width 404 * and height fields in the driver specific must equal to that of u32, i.e. four 405 * bytes. 406 * 407 * Returns the best match or NULL if the length of the array is zero. 408 */ 409 #define v4l2_find_nearest_size(array, array_size, width_field, height_field, \ 410 width, height) \ 411 ({ \ 412 BUILD_BUG_ON(sizeof((array)->width_field) != sizeof(u32) || \ 413 sizeof((array)->height_field) != sizeof(u32)); \ 414 (typeof(&(array)[0]))__v4l2_find_nearest_size( \ 415 (array), array_size, sizeof(*(array)), \ 416 offsetof(typeof(*(array)), width_field), \ 417 offsetof(typeof(*(array)), height_field), \ 418 width, height); \ 419 }) 420 const void * 421 __v4l2_find_nearest_size(const void *array, size_t array_size, 422 size_t entry_size, size_t width_offset, 423 size_t height_offset, s32 width, s32 height); 424 425 /** 426 * v4l2_g_parm_cap - helper routine for vidioc_g_parm to fill this in by 427 * calling the g_frame_interval op of the given subdev. It only works 428 * for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the 429 * function name. 430 * 431 * @vdev: the struct video_device pointer. Used to determine the device caps. 432 * @sd: the sub-device pointer. 433 * @a: the VIDIOC_G_PARM argument. 434 */ 435 int v4l2_g_parm_cap(struct video_device *vdev, 436 struct v4l2_subdev *sd, struct v4l2_streamparm *a); 437 438 /** 439 * v4l2_s_parm_cap - helper routine for vidioc_s_parm to fill this in by 440 * calling the s_frame_interval op of the given subdev. It only works 441 * for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the 442 * function name. 443 * 444 * @vdev: the struct video_device pointer. Used to determine the device caps. 445 * @sd: the sub-device pointer. 446 * @a: the VIDIOC_S_PARM argument. 447 */ 448 int v4l2_s_parm_cap(struct video_device *vdev, 449 struct v4l2_subdev *sd, struct v4l2_streamparm *a); 450 451 /* Compare two v4l2_fract structs */ 452 #define V4L2_FRACT_COMPARE(a, OP, b) \ 453 ((u64)(a).numerator * (b).denominator OP \ 454 (u64)(b).numerator * (a).denominator) 455 456 /* ------------------------------------------------------------------------- */ 457 458 /* Pixel format and FourCC helpers */ 459 460 /** 461 * enum v4l2_pixel_encoding - specifies the pixel encoding value 462 * 463 * @V4L2_PIXEL_ENC_UNKNOWN: Pixel encoding is unknown/un-initialized 464 * @V4L2_PIXEL_ENC_YUV: Pixel encoding is YUV 465 * @V4L2_PIXEL_ENC_RGB: Pixel encoding is RGB 466 * @V4L2_PIXEL_ENC_BAYER: Pixel encoding is Bayer 467 */ 468 enum v4l2_pixel_encoding { 469 V4L2_PIXEL_ENC_UNKNOWN = 0, 470 V4L2_PIXEL_ENC_YUV = 1, 471 V4L2_PIXEL_ENC_RGB = 2, 472 V4L2_PIXEL_ENC_BAYER = 3, 473 }; 474 475 /** 476 * struct v4l2_format_info - information about a V4L2 format 477 * @format: 4CC format identifier (V4L2_PIX_FMT_*) 478 * @pixel_enc: Pixel encoding (see enum v4l2_pixel_encoding above) 479 * @mem_planes: Number of memory planes, which includes the alpha plane (1 to 4). 480 * @comp_planes: Number of component planes, which includes the alpha plane (1 to 4). 481 * @bpp: Array of per-plane bytes per pixel 482 * @hdiv: Horizontal chroma subsampling factor 483 * @vdiv: Vertical chroma subsampling factor 484 * @block_w: Per-plane macroblock pixel width (optional) 485 * @block_h: Per-plane macroblock pixel height (optional) 486 */ 487 struct v4l2_format_info { 488 u32 format; 489 u8 pixel_enc; 490 u8 mem_planes; 491 u8 comp_planes; 492 u8 bpp[4]; 493 u8 hdiv; 494 u8 vdiv; 495 u8 block_w[4]; 496 u8 block_h[4]; 497 }; 498 499 static inline bool v4l2_is_format_rgb(const struct v4l2_format_info *f) 500 { 501 return f && f->pixel_enc == V4L2_PIXEL_ENC_RGB; 502 } 503 504 static inline bool v4l2_is_format_yuv(const struct v4l2_format_info *f) 505 { 506 return f && f->pixel_enc == V4L2_PIXEL_ENC_YUV; 507 } 508 509 static inline bool v4l2_is_format_bayer(const struct v4l2_format_info *f) 510 { 511 return f && f->pixel_enc == V4L2_PIXEL_ENC_BAYER; 512 } 513 514 const struct v4l2_format_info *v4l2_format_info(u32 format); 515 void v4l2_apply_frmsize_constraints(u32 *width, u32 *height, 516 const struct v4l2_frmsize_stepwise *frmsize); 517 int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, u32 pixelformat, 518 u32 width, u32 height); 519 int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, u32 pixelformat, 520 u32 width, u32 height); 521 522 static inline u64 v4l2_buffer_get_timestamp(const struct v4l2_buffer *buf) 523 { 524 /* 525 * When the timestamp comes from 32-bit user space, there may be 526 * uninitialized data in tv_usec, so cast it to u32. 527 * Otherwise allow invalid input for backwards compatibility. 528 */ 529 return buf->timestamp.tv_sec * NSEC_PER_SEC + 530 (u32)buf->timestamp.tv_usec * NSEC_PER_USEC; 531 } 532 533 static inline void v4l2_buffer_set_timestamp(struct v4l2_buffer *buf, 534 u64 timestamp) 535 { 536 struct timespec64 ts = ns_to_timespec64(timestamp); 537 538 buf->timestamp.tv_sec = ts.tv_sec; 539 buf->timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC; 540 } 541 542 #endif /* V4L2_COMMON_H_ */ 543