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 drivers's name 179 * will be used 180 * @postfix: sub-device specific string to put right after the I²C device name; 181 * may be NULL 182 */ 183 void v4l2_i2c_subdev_set_name(struct v4l2_subdev *sd, struct i2c_client *client, 184 const char *devname, const char *postfix); 185 186 /** 187 * v4l2_i2c_subdev_init - Initializes a &struct v4l2_subdev with data from 188 * an i2c_client struct. 189 * 190 * @sd: pointer to &struct v4l2_subdev 191 * @client: pointer to struct i2c_client 192 * @ops: pointer to &struct v4l2_subdev_ops 193 */ 194 void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client, 195 const struct v4l2_subdev_ops *ops); 196 197 /** 198 * v4l2_i2c_subdev_addr - returns i2c client address of &struct v4l2_subdev. 199 * 200 * @sd: pointer to &struct v4l2_subdev 201 * 202 * Returns the address of an I2C sub-device 203 */ 204 unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd); 205 206 /** 207 * v4l2_i2c_tuner_addrs - Return a list of I2C tuner addresses to probe. 208 * 209 * @type: type of the tuner to seek, as defined by 210 * &enum v4l2_i2c_tuner_type. 211 * 212 * NOTE: Use only if the tuner addresses are unknown. 213 */ 214 const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type); 215 216 /** 217 * v4l2_i2c_subdev_unregister - Unregister a v4l2_subdev 218 * 219 * @sd: pointer to &struct v4l2_subdev 220 */ 221 void v4l2_i2c_subdev_unregister(struct v4l2_subdev *sd); 222 223 #else 224 225 static inline struct v4l2_subdev * 226 v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev, 227 struct i2c_adapter *adapter, const char *client_type, 228 u8 addr, const unsigned short *probe_addrs) 229 { 230 return NULL; 231 } 232 233 static inline struct v4l2_subdev * 234 v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev, 235 struct i2c_adapter *adapter, struct i2c_board_info *info, 236 const unsigned short *probe_addrs) 237 { 238 return NULL; 239 } 240 241 static inline void 242 v4l2_i2c_subdev_set_name(struct v4l2_subdev *sd, struct i2c_client *client, 243 const char *devname, const char *postfix) 244 {} 245 246 static inline void 247 v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client, 248 const struct v4l2_subdev_ops *ops) 249 {} 250 251 static inline unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd) 252 { 253 return I2C_CLIENT_END; 254 } 255 256 static inline const unsigned short * 257 v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type) 258 { 259 return NULL; 260 } 261 262 static inline void v4l2_i2c_subdev_unregister(struct v4l2_subdev *sd) 263 {} 264 265 #endif 266 267 /* ------------------------------------------------------------------------- */ 268 269 /* SPI Helper functions */ 270 271 #include <linux/spi/spi.h> 272 273 #if defined(CONFIG_SPI) 274 275 /** 276 * v4l2_spi_new_subdev - Load an spi module and return an initialized 277 * &struct v4l2_subdev. 278 * 279 * 280 * @v4l2_dev: pointer to &struct v4l2_device. 281 * @master: pointer to struct spi_master. 282 * @info: pointer to struct spi_board_info. 283 * 284 * returns a &struct v4l2_subdev pointer. 285 */ 286 struct v4l2_subdev *v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev, 287 struct spi_master *master, struct spi_board_info *info); 288 289 /** 290 * v4l2_spi_subdev_init - Initialize a v4l2_subdev with data from an 291 * spi_device struct. 292 * 293 * @sd: pointer to &struct v4l2_subdev 294 * @spi: pointer to struct spi_device. 295 * @ops: pointer to &struct v4l2_subdev_ops 296 */ 297 void v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi, 298 const struct v4l2_subdev_ops *ops); 299 300 /** 301 * v4l2_spi_subdev_unregister - Unregister a v4l2_subdev 302 * 303 * @sd: pointer to &struct v4l2_subdev 304 */ 305 void v4l2_spi_subdev_unregister(struct v4l2_subdev *sd); 306 307 #else 308 309 static inline struct v4l2_subdev * 310 v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev, 311 struct spi_master *master, struct spi_board_info *info) 312 { 313 return NULL; 314 } 315 316 static inline void 317 v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi, 318 const struct v4l2_subdev_ops *ops) 319 {} 320 321 static inline void v4l2_spi_subdev_unregister(struct v4l2_subdev *sd) 322 {} 323 #endif 324 325 /* ------------------------------------------------------------------------- */ 326 327 /* 328 * FIXME: these remaining ioctls/structs should be removed as well, but they 329 * are still used in tuner-simple.c (TUNER_SET_CONFIG) and cx18/ivtv (RESET). 330 * To remove these ioctls some more cleanup is needed in those modules. 331 * 332 * It doesn't make much sense on documenting them, as what we really want is 333 * to get rid of them. 334 */ 335 336 /* s_config */ 337 struct v4l2_priv_tun_config { 338 int tuner; 339 void *priv; 340 }; 341 #define TUNER_SET_CONFIG _IOW('d', 92, struct v4l2_priv_tun_config) 342 343 #define VIDIOC_INT_RESET _IOW ('d', 102, u32) 344 345 /* ------------------------------------------------------------------------- */ 346 347 /* Miscellaneous helper functions */ 348 349 /** 350 * v4l_bound_align_image - adjust video dimensions according to 351 * a given constraints. 352 * 353 * @width: pointer to width that will be adjusted if needed. 354 * @wmin: minimum width. 355 * @wmax: maximum width. 356 * @walign: least significant bit on width. 357 * @height: pointer to height that will be adjusted if needed. 358 * @hmin: minimum height. 359 * @hmax: maximum height. 360 * @halign: least significant bit on height. 361 * @salign: least significant bit for the image size (e. g. 362 * :math:`width * height`). 363 * 364 * Clip an image to have @width between @wmin and @wmax, and @height between 365 * @hmin and @hmax, inclusive. 366 * 367 * Additionally, the @width will be a multiple of :math:`2^{walign}`, 368 * the @height will be a multiple of :math:`2^{halign}`, and the overall 369 * size :math:`width * height` will be a multiple of :math:`2^{salign}`. 370 * 371 * .. note:: 372 * 373 * #. The clipping rectangle may be shrunk or enlarged to fit the alignment 374 * constraints. 375 * #. @wmax must not be smaller than @wmin. 376 * #. @hmax must not be smaller than @hmin. 377 * #. The alignments must not be so high there are no possible image 378 * sizes within the allowed bounds. 379 * #. @wmin and @hmin must be at least 1 (don't use 0). 380 * #. For @walign, @halign and @salign, if you don't care about a certain 381 * alignment, specify ``0``, as :math:`2^0 = 1` and one byte alignment 382 * is equivalent to no alignment. 383 * #. If you only want to adjust downward, specify a maximum that's the 384 * same as the initial value. 385 */ 386 void v4l_bound_align_image(unsigned int *width, unsigned int wmin, 387 unsigned int wmax, unsigned int walign, 388 unsigned int *height, unsigned int hmin, 389 unsigned int hmax, unsigned int halign, 390 unsigned int salign); 391 392 /** 393 * v4l2_find_nearest_size - Find the nearest size among a discrete 394 * set of resolutions contained in an array of a driver specific struct. 395 * 396 * @array: a driver specific array of image sizes 397 * @array_size: the length of the driver specific array of image sizes 398 * @width_field: the name of the width field in the driver specific struct 399 * @height_field: the name of the height field in the driver specific struct 400 * @width: desired width. 401 * @height: desired height. 402 * 403 * Finds the closest resolution to minimize the width and height differences 404 * between what requested and the supported resolutions. The size of the width 405 * and height fields in the driver specific must equal to that of u32, i.e. four 406 * bytes. 407 * 408 * Returns the best match or NULL if the length of the array is zero. 409 */ 410 #define v4l2_find_nearest_size(array, array_size, width_field, height_field, \ 411 width, height) \ 412 ({ \ 413 BUILD_BUG_ON(sizeof((array)->width_field) != sizeof(u32) || \ 414 sizeof((array)->height_field) != sizeof(u32)); \ 415 (typeof(&(array)[0]))__v4l2_find_nearest_size( \ 416 (array), array_size, sizeof(*(array)), \ 417 offsetof(typeof(*(array)), width_field), \ 418 offsetof(typeof(*(array)), height_field), \ 419 width, height); \ 420 }) 421 const void * 422 __v4l2_find_nearest_size(const void *array, size_t array_size, 423 size_t entry_size, size_t width_offset, 424 size_t height_offset, s32 width, s32 height); 425 426 /** 427 * v4l2_g_parm_cap - helper routine for vidioc_g_parm to fill this in by 428 * calling the g_frame_interval op of the given subdev. It only works 429 * for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the 430 * function name. 431 * 432 * @vdev: the struct video_device pointer. Used to determine the device caps. 433 * @sd: the sub-device pointer. 434 * @a: the VIDIOC_G_PARM argument. 435 */ 436 int v4l2_g_parm_cap(struct video_device *vdev, 437 struct v4l2_subdev *sd, struct v4l2_streamparm *a); 438 439 /** 440 * v4l2_s_parm_cap - helper routine for vidioc_s_parm to fill this in by 441 * calling the s_frame_interval op of the given subdev. It only works 442 * for V4L2_BUF_TYPE_VIDEO_CAPTURE(_MPLANE), hence the _cap in the 443 * function name. 444 * 445 * @vdev: the struct video_device pointer. Used to determine the device caps. 446 * @sd: the sub-device pointer. 447 * @a: the VIDIOC_S_PARM argument. 448 */ 449 int v4l2_s_parm_cap(struct video_device *vdev, 450 struct v4l2_subdev *sd, struct v4l2_streamparm *a); 451 452 /* Compare two v4l2_fract structs */ 453 #define V4L2_FRACT_COMPARE(a, OP, b) \ 454 ((u64)(a).numerator * (b).denominator OP \ 455 (u64)(b).numerator * (a).denominator) 456 457 /* ------------------------------------------------------------------------- */ 458 459 /* Pixel format and FourCC helpers */ 460 461 /** 462 * enum v4l2_pixel_encoding - specifies the pixel encoding value 463 * 464 * @V4L2_PIXEL_ENC_UNKNOWN: Pixel encoding is unknown/un-initialized 465 * @V4L2_PIXEL_ENC_YUV: Pixel encoding is YUV 466 * @V4L2_PIXEL_ENC_RGB: Pixel encoding is RGB 467 * @V4L2_PIXEL_ENC_BAYER: Pixel encoding is Bayer 468 */ 469 enum v4l2_pixel_encoding { 470 V4L2_PIXEL_ENC_UNKNOWN = 0, 471 V4L2_PIXEL_ENC_YUV = 1, 472 V4L2_PIXEL_ENC_RGB = 2, 473 V4L2_PIXEL_ENC_BAYER = 3, 474 }; 475 476 /** 477 * struct v4l2_format_info - information about a V4L2 format 478 * @format: 4CC format identifier (V4L2_PIX_FMT_*) 479 * @pixel_enc: Pixel encoding (see enum v4l2_pixel_encoding above) 480 * @mem_planes: Number of memory planes, which includes the alpha plane (1 to 4). 481 * @comp_planes: Number of component planes, which includes the alpha plane (1 to 4). 482 * @bpp: Array of per-plane bytes per pixel 483 * @hdiv: Horizontal chroma subsampling factor 484 * @vdiv: Vertical chroma subsampling factor 485 * @block_w: Per-plane macroblock pixel width (optional) 486 * @block_h: Per-plane macroblock pixel height (optional) 487 */ 488 struct v4l2_format_info { 489 u32 format; 490 u8 pixel_enc; 491 u8 mem_planes; 492 u8 comp_planes; 493 u8 bpp[4]; 494 u8 hdiv; 495 u8 vdiv; 496 u8 block_w[4]; 497 u8 block_h[4]; 498 }; 499 500 static inline bool v4l2_is_format_rgb(const struct v4l2_format_info *f) 501 { 502 return f && f->pixel_enc == V4L2_PIXEL_ENC_RGB; 503 } 504 505 static inline bool v4l2_is_format_yuv(const struct v4l2_format_info *f) 506 { 507 return f && f->pixel_enc == V4L2_PIXEL_ENC_YUV; 508 } 509 510 static inline bool v4l2_is_format_bayer(const struct v4l2_format_info *f) 511 { 512 return f && f->pixel_enc == V4L2_PIXEL_ENC_BAYER; 513 } 514 515 const struct v4l2_format_info *v4l2_format_info(u32 format); 516 void v4l2_apply_frmsize_constraints(u32 *width, u32 *height, 517 const struct v4l2_frmsize_stepwise *frmsize); 518 int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, u32 pixelformat, 519 u32 width, u32 height); 520 int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, u32 pixelformat, 521 u32 width, u32 height); 522 523 /** 524 * v4l2_get_link_freq - Get link rate from transmitter 525 * 526 * @handler: The transmitter's control handler 527 * @mul: The multiplier between pixel rate and link frequency. Bits per pixel on 528 * D-PHY, samples per clock on parallel. 0 otherwise. 529 * @div: The divisor between pixel rate and link frequency. Number of data lanes 530 * times two on D-PHY, 1 on parallel. 0 otherwise. 531 * 532 * This function is intended for obtaining the link frequency from the 533 * transmitter sub-devices. It returns the link rate, either from the 534 * V4L2_CID_LINK_FREQ control implemented by the transmitter, or value 535 * calculated based on the V4L2_CID_PIXEL_RATE implemented by the transmitter. 536 * 537 * Returns link frequency on success, otherwise a negative error code: 538 * -ENOENT: Link frequency or pixel rate control not found 539 * -EINVAL: Invalid link frequency value 540 */ 541 s64 v4l2_get_link_freq(struct v4l2_ctrl_handler *handler, unsigned int mul, 542 unsigned int div); 543 544 void v4l2_simplify_fraction(u32 *numerator, u32 *denominator, 545 unsigned int n_terms, unsigned int threshold); 546 u32 v4l2_fraction_to_interval(u32 numerator, u32 denominator); 547 548 static inline u64 v4l2_buffer_get_timestamp(const struct v4l2_buffer *buf) 549 { 550 /* 551 * When the timestamp comes from 32-bit user space, there may be 552 * uninitialized data in tv_usec, so cast it to u32. 553 * Otherwise allow invalid input for backwards compatibility. 554 */ 555 return buf->timestamp.tv_sec * NSEC_PER_SEC + 556 (u32)buf->timestamp.tv_usec * NSEC_PER_USEC; 557 } 558 559 static inline void v4l2_buffer_set_timestamp(struct v4l2_buffer *buf, 560 u64 timestamp) 561 { 562 struct timespec64 ts = ns_to_timespec64(timestamp); 563 564 buf->timestamp.tv_sec = ts.tv_sec; 565 buf->timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC; 566 } 567 568 static inline bool v4l2_is_colorspace_valid(__u32 colorspace) 569 { 570 return colorspace > V4L2_COLORSPACE_DEFAULT && 571 colorspace < V4L2_COLORSPACE_LAST; 572 } 573 574 static inline bool v4l2_is_xfer_func_valid(__u32 xfer_func) 575 { 576 return xfer_func > V4L2_XFER_FUNC_DEFAULT && 577 xfer_func < V4L2_XFER_FUNC_LAST; 578 } 579 580 static inline bool v4l2_is_ycbcr_enc_valid(__u8 ycbcr_enc) 581 { 582 return ycbcr_enc > V4L2_YCBCR_ENC_DEFAULT && 583 ycbcr_enc < V4L2_YCBCR_ENC_LAST; 584 } 585 586 static inline bool v4l2_is_hsv_enc_valid(__u8 hsv_enc) 587 { 588 return hsv_enc == V4L2_HSV_ENC_180 || hsv_enc == V4L2_HSV_ENC_256; 589 } 590 591 static inline bool v4l2_is_quant_valid(__u8 quantization) 592 { 593 return quantization == V4L2_QUANTIZATION_FULL_RANGE || 594 quantization == V4L2_QUANTIZATION_LIM_RANGE; 595 } 596 597 #endif /* V4L2_COMMON_H_ */ 598