kernel/drivers/media/v4l2-core/v4l2-flash-led-class.c

   1 /*
   2  * V4L2 flash LED sub-device registration helpers.
   3  *
   4  *      Copyright (C) 2015 Samsung Electronics Co., Ltd
   5  *      Author: Jacek Anaszewski <j.anaszewski@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/led-class-flash.h>
  13 #include <linux/module.h>
  14 #include <linux/mutex.h>
  15 #include <linux/of.h>
  16 #include <linux/slab.h>
  17 #include <linux/types.h>
  18 #include <media/v4l2-flash-led-class.h>
  19
  20 #define has_flash_op(v4l2_flash, op)                            \
  21         (v4l2_flash && v4l2_flash->ops->op)
  22
  23 #define call_flash_op(v4l2_flash, op, arg)                      \
  24                 (has_flash_op(v4l2_flash, op) ?                 \
  25                         v4l2_flash->ops->op(v4l2_flash, arg) :  \
  26                         -EINVAL)
  27
  28 enum ctrl_init_data_id {
  29         LED_MODE,
  30         TORCH_INTENSITY,
  31         FLASH_INTENSITY,
  32         INDICATOR_INTENSITY,
  33         FLASH_TIMEOUT,
  34         STROBE_SOURCE,
  35         /*
  36          * Only above values are applicable to
  37          * the 'ctrls' array in the struct v4l2_flash.
  38          */
  39         FLASH_STROBE,
  40         STROBE_STOP,
  41         STROBE_STATUS,
  42         FLASH_FAULT,
  43         NUM_FLASH_CTRLS,
  44 };
  45
  46 static enum led_brightness __intensity_to_led_brightness(
  47                                         struct v4l2_ctrl *ctrl, s32 intensity)
  48 {
  49         intensity -= ctrl->minimum;
  50         intensity /= (u32) ctrl->step;
  51
  52         /*
  53          * Indicator LEDs, unlike torch LEDs, are turned on/off basing on
  54          * the state of V4L2_CID_FLASH_INDICATOR_INTENSITY control only.
  55          * Therefore it must be possible to set it to 0 level which in
  56          * the LED subsystem reflects LED_OFF state.
  57          */
  58         if (ctrl->minimum)
  59                 ++intensity;
  60
  61         return intensity;
  62 }
  63
  64 static s32 __led_brightness_to_intensity(struct v4l2_ctrl *ctrl,
  65                                          enum led_brightness brightness)
  66 {
  67         /*
  68          * Indicator LEDs, unlike torch LEDs, are turned on/off basing on
  69          * the state of V4L2_CID_FLASH_INDICATOR_INTENSITY control only.
  70          * Do not decrement brightness read from the LED subsystem for
  71          * indicator LED as it may equal 0. For torch LEDs this function
  72          * is called only when V4L2_FLASH_LED_MODE_TORCH is set and the
  73          * brightness read is guaranteed to be greater than 0. In the mode
  74          * V4L2_FLASH_LED_MODE_NONE the cached torch intensity value is used.
  75          */
  76         if (ctrl->id != V4L2_CID_FLASH_INDICATOR_INTENSITY)
  77                 --brightness;
  78
  79         return (brightness * ctrl->step) + ctrl->minimum;
  80 }
  81
  82 static void v4l2_flash_set_led_brightness(struct v4l2_flash *v4l2_flash,
  83                                         struct v4l2_ctrl *ctrl)
  84 {
  85         struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
  86         enum led_brightness brightness;
  87
  88         if (has_flash_op(v4l2_flash, intensity_to_led_brightness))
  89                 brightness = call_flash_op(v4l2_flash,
  90                                         intensity_to_led_brightness,
  91                                         ctrl->val);
  92         else
  93                 brightness = __intensity_to_led_brightness(ctrl, ctrl->val);
  94         /*
  95          * In case a LED Flash class driver provides ops for custom
  96          * brightness <-> intensity conversion, it also must have defined
  97          * related v4l2 control step == 1. In such a case a backward conversion
  98          * from led brightness to v4l2 intensity is required to find out the
  99          * the aligned intensity value.
 100          */
 101         if (has_flash_op(v4l2_flash, led_brightness_to_intensity))
 102                 ctrl->val = call_flash_op(v4l2_flash,
 103                                         led_brightness_to_intensity,
 104                                         brightness);
 105
 106         if (ctrl == ctrls[TORCH_INTENSITY]) {
 107                 if (ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH)
 108                         return;
 109
 110                 led_set_brightness(&v4l2_flash->fled_cdev->led_cdev,
 111                                         brightness);
 112         } else {
 113                 led_set_brightness(&v4l2_flash->iled_cdev->led_cdev,
 114                                         brightness);
 115         }
 116 }
 117
 118 static int v4l2_flash_update_led_brightness(struct v4l2_flash *v4l2_flash,
 119                                         struct v4l2_ctrl *ctrl)
 120 {
 121         struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
 122         struct led_classdev *led_cdev;
 123         int ret;
 124
 125         if (ctrl == ctrls[TORCH_INTENSITY]) {
 126                 /*
 127                  * Update torch brightness only if in TORCH_MODE. In other modes
 128                  * torch led is turned off, which would spuriously inform the
 129                  * user space that V4L2_CID_FLASH_TORCH_INTENSITY control value
 130                  * has changed to 0.
 131                  */
 132                 if (ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH)
 133                         return 0;
 134                 led_cdev = &v4l2_flash->fled_cdev->led_cdev;
 135         } else {
 136                 led_cdev = &v4l2_flash->iled_cdev->led_cdev;
 137         }
 138
 139         ret = led_update_brightness(led_cdev);
 140         if (ret < 0)
 141                 return ret;
 142
 143         if (has_flash_op(v4l2_flash, led_brightness_to_intensity))
 144                 ctrl->val = call_flash_op(v4l2_flash,
 145                                                 led_brightness_to_intensity,
 146                                                 led_cdev->brightness);
 147         else
 148                 ctrl->val = __led_brightness_to_intensity(ctrl,
 149                                                 led_cdev->brightness);
 150
 151         return 0;
 152 }
 153
 154 static int v4l2_flash_g_volatile_ctrl(struct v4l2_ctrl *c)
 155 {
 156         struct v4l2_flash *v4l2_flash = v4l2_ctrl_to_v4l2_flash(c);
 157         struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
 158         bool is_strobing;
 159         int ret;
 160
 161         switch (c->id) {
 162         case V4L2_CID_FLASH_TORCH_INTENSITY:
 163         case V4L2_CID_FLASH_INDICATOR_INTENSITY:
 164                 return v4l2_flash_update_led_brightness(v4l2_flash, c);
 165         case V4L2_CID_FLASH_INTENSITY:
 166                 ret = led_update_flash_brightness(fled_cdev);
 167                 if (ret < 0)
 168                         return ret;
 169                 /*
 170                  * No conversion is needed as LED Flash class also uses
 171                  * microamperes for flash intensity units.
 172                  */
 173                 c->val = fled_cdev->brightness.val;
 174                 return 0;
 175         case V4L2_CID_FLASH_STROBE_STATUS:
 176                 ret = led_get_flash_strobe(fled_cdev, &is_strobing);
 177                 if (ret < 0)
 178                         return ret;
 179                 c->val = is_strobing;
 180                 return 0;
 181         case V4L2_CID_FLASH_FAULT:
 182                 /* LED faults map directly to V4L2 flash faults */
 183                 return led_get_flash_fault(fled_cdev, &c->val);
 184         default:
 185                 return -EINVAL;
 186         }
 187 }
 188
 189 static bool __software_strobe_mode_inactive(struct v4l2_ctrl **ctrls)
 190 {
 191         return ((ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_FLASH) ||
 192                 (ctrls[STROBE_SOURCE] && (ctrls[STROBE_SOURCE]->val !=
 193                                 V4L2_FLASH_STROBE_SOURCE_SOFTWARE)));
 194 }
 195
 196 static int v4l2_flash_s_ctrl(struct v4l2_ctrl *c)
 197 {
 198         struct v4l2_flash *v4l2_flash = v4l2_ctrl_to_v4l2_flash(c);
 199         struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
 200         struct led_classdev *led_cdev = &fled_cdev->led_cdev;
 201         struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
 202         bool external_strobe;
 203         int ret = 0;
 204
 205         switch (c->id) {
 206         case V4L2_CID_FLASH_LED_MODE:
 207                 switch (c->val) {
 208                 case V4L2_FLASH_LED_MODE_NONE:
 209                         led_set_brightness(led_cdev, LED_OFF);
 210                         return led_set_flash_strobe(fled_cdev, false);
 211                 case V4L2_FLASH_LED_MODE_FLASH:
 212                         /* Turn the torch LED off */
 213                         led_set_brightness(led_cdev, LED_OFF);
 214                         if (ctrls[STROBE_SOURCE]) {
 215                                 external_strobe = (ctrls[STROBE_SOURCE]->val ==
 216                                         V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
 217
 218                                 ret = call_flash_op(v4l2_flash,
 219                                                 external_strobe_set,
 220                                                 external_strobe);
 221                         }
 222                         return ret;
 223                 case V4L2_FLASH_LED_MODE_TORCH:
 224                         if (ctrls[STROBE_SOURCE]) {
 225                                 ret = call_flash_op(v4l2_flash,
 226                                                 external_strobe_set,
 227                                                 false);
 228                                 if (ret < 0)
 229                                         return ret;
 230                         }
 231                         /* Stop flash strobing */
 232                         ret = led_set_flash_strobe(fled_cdev, false);
 233                         if (ret < 0)
 234                                 return ret;
 235
 236                         v4l2_flash_set_led_brightness(v4l2_flash,
 237                                                         ctrls[TORCH_INTENSITY]);
 238                         return 0;
 239                 }
 240                 break;
 241         case V4L2_CID_FLASH_STROBE_SOURCE:
 242                 external_strobe = (c->val == V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
 243                 /*
 244                  * For some hardware arrangements setting strobe source may
 245                  * affect torch mode. Therefore, if not in the flash mode,
 246                  * cache only this setting. It will be applied upon switching
 247                  * to flash mode.
 248                  */
 249                 if (ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_FLASH)
 250                         return 0;
 251
 252                 return call_flash_op(v4l2_flash, external_strobe_set,
 253                                         external_strobe);
 254         case V4L2_CID_FLASH_STROBE:
 255                 if (__software_strobe_mode_inactive(ctrls))
 256                         return -EBUSY;
 257                 return led_set_flash_strobe(fled_cdev, true);
 258         case V4L2_CID_FLASH_STROBE_STOP:
 259                 if (__software_strobe_mode_inactive(ctrls))
 260                         return -EBUSY;
 261                 return led_set_flash_strobe(fled_cdev, false);
 262         case V4L2_CID_FLASH_TIMEOUT:
 263                 /*
 264                  * No conversion is needed as LED Flash class also uses
 265                  * microseconds for flash timeout units.
 266                  */
 267                 return led_set_flash_timeout(fled_cdev, c->val);
 268         case V4L2_CID_FLASH_INTENSITY:
 269                 /*
 270                  * No conversion is needed as LED Flash class also uses
 271                  * microamperes for flash intensity units.
 272                  */
 273                 return led_set_flash_brightness(fled_cdev, c->val);
 274         case V4L2_CID_FLASH_TORCH_INTENSITY:
 275         case V4L2_CID_FLASH_INDICATOR_INTENSITY:
 276                 v4l2_flash_set_led_brightness(v4l2_flash, c);
 277                 return 0;
 278         }
 279
 280         return -EINVAL;
 281 }
 282
 283 static const struct v4l2_ctrl_ops v4l2_flash_ctrl_ops = {
 284         .g_volatile_ctrl = v4l2_flash_g_volatile_ctrl,
 285         .s_ctrl = v4l2_flash_s_ctrl,
 286 };
 287
 288 static void __lfs_to_v4l2_ctrl_config(struct led_flash_setting *s,
 289                                 struct v4l2_ctrl_config *c)
 290 {
 291         c->min = s->min;
 292         c->max = s->max;
 293         c->step = s->step;
 294         c->def = s->val;
 295 }
 296
 297 static void __fill_ctrl_init_data(struct v4l2_flash *v4l2_flash,
 298                           struct v4l2_flash_config *flash_cfg,
 299                           struct v4l2_flash_ctrl_data *ctrl_init_data)
 300 {
 301         struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
 302         const struct led_flash_ops *fled_cdev_ops = fled_cdev->ops;
 303         struct led_classdev *led_cdev = &fled_cdev->led_cdev;
 304         struct v4l2_ctrl_config *ctrl_cfg;
 305         u32 mask;
 306
 307         /* Init FLASH_FAULT ctrl data */
 308         if (flash_cfg->flash_faults) {
 309                 ctrl_init_data[FLASH_FAULT].cid = V4L2_CID_FLASH_FAULT;
 310                 ctrl_cfg = &ctrl_init_data[FLASH_FAULT].config;
 311                 ctrl_cfg->id = V4L2_CID_FLASH_FAULT;
 312                 ctrl_cfg->max = flash_cfg->flash_faults;
 313                 ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
 314                                   V4L2_CTRL_FLAG_READ_ONLY;
 315         }
 316
 317         /* Init FLASH_LED_MODE ctrl data */
 318         mask = 1 << V4L2_FLASH_LED_MODE_NONE |
 319                1 << V4L2_FLASH_LED_MODE_TORCH;
 320         if (led_cdev->flags & LED_DEV_CAP_FLASH)
 321                 mask |= 1 << V4L2_FLASH_LED_MODE_FLASH;
 322
 323         ctrl_init_data[LED_MODE].cid = V4L2_CID_FLASH_LED_MODE;
 324         ctrl_cfg = &ctrl_init_data[LED_MODE].config;
 325         ctrl_cfg->id = V4L2_CID_FLASH_LED_MODE;
 326         ctrl_cfg->max = V4L2_FLASH_LED_MODE_TORCH;
 327         ctrl_cfg->menu_skip_mask = ~mask;
 328         ctrl_cfg->def = V4L2_FLASH_LED_MODE_NONE;
 329         ctrl_cfg->flags = 0;
 330
 331         /* Init TORCH_INTENSITY ctrl data */
 332         ctrl_init_data[TORCH_INTENSITY].cid = V4L2_CID_FLASH_TORCH_INTENSITY;
 333         ctrl_cfg = &ctrl_init_data[TORCH_INTENSITY].config;
 334         __lfs_to_v4l2_ctrl_config(&flash_cfg->torch_intensity, ctrl_cfg);
 335         ctrl_cfg->id = V4L2_CID_FLASH_TORCH_INTENSITY;
 336         ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
 337                           V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
 338
 339         /* Init INDICATOR_INTENSITY ctrl data */
 340         if (v4l2_flash->iled_cdev) {
 341                 ctrl_init_data[INDICATOR_INTENSITY].cid =
 342                                         V4L2_CID_FLASH_INDICATOR_INTENSITY;
 343                 ctrl_cfg = &ctrl_init_data[INDICATOR_INTENSITY].config;
 344                 __lfs_to_v4l2_ctrl_config(&flash_cfg->indicator_intensity,
 345                                           ctrl_cfg);
 346                 ctrl_cfg->id = V4L2_CID_FLASH_INDICATOR_INTENSITY;
 347                 ctrl_cfg->min = 0;
 348                 ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
 349                                   V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
 350         }
 351
 352         if (!(led_cdev->flags & LED_DEV_CAP_FLASH))
 353                 return;
 354
 355         /* Init FLASH_STROBE ctrl data */
 356         ctrl_init_data[FLASH_STROBE].cid = V4L2_CID_FLASH_STROBE;
 357         ctrl_cfg = &ctrl_init_data[FLASH_STROBE].config;
 358         ctrl_cfg->id = V4L2_CID_FLASH_STROBE;
 359
 360         /* Init STROBE_STOP ctrl data */
 361         ctrl_init_data[STROBE_STOP].cid = V4L2_CID_FLASH_STROBE_STOP;
 362         ctrl_cfg = &ctrl_init_data[STROBE_STOP].config;
 363         ctrl_cfg->id = V4L2_CID_FLASH_STROBE_STOP;
 364
 365         /* Init FLASH_STROBE_SOURCE ctrl data */
 366         if (flash_cfg->has_external_strobe) {
 367                 mask = (1 << V4L2_FLASH_STROBE_SOURCE_SOFTWARE) |
 368                        (1 << V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
 369                 ctrl_init_data[STROBE_SOURCE].cid =
 370                                         V4L2_CID_FLASH_STROBE_SOURCE;
 371                 ctrl_cfg = &ctrl_init_data[STROBE_SOURCE].config;
 372                 ctrl_cfg->id = V4L2_CID_FLASH_STROBE_SOURCE;
 373                 ctrl_cfg->max = V4L2_FLASH_STROBE_SOURCE_EXTERNAL;
 374                 ctrl_cfg->menu_skip_mask = ~mask;
 375                 ctrl_cfg->def = V4L2_FLASH_STROBE_SOURCE_SOFTWARE;
 376         }
 377
 378         /* Init STROBE_STATUS ctrl data */
 379         if (fled_cdev_ops->strobe_get) {
 380                 ctrl_init_data[STROBE_STATUS].cid =
 381                                         V4L2_CID_FLASH_STROBE_STATUS;
 382                 ctrl_cfg = &ctrl_init_data[STROBE_STATUS].config;
 383                 ctrl_cfg->id = V4L2_CID_FLASH_STROBE_STATUS;
 384                 ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
 385                                   V4L2_CTRL_FLAG_READ_ONLY;
 386         }
 387
 388         /* Init FLASH_TIMEOUT ctrl data */
 389         if (fled_cdev_ops->timeout_set) {
 390                 ctrl_init_data[FLASH_TIMEOUT].cid = V4L2_CID_FLASH_TIMEOUT;
 391                 ctrl_cfg = &ctrl_init_data[FLASH_TIMEOUT].config;
 392                 __lfs_to_v4l2_ctrl_config(&fled_cdev->timeout, ctrl_cfg);
 393                 ctrl_cfg->id = V4L2_CID_FLASH_TIMEOUT;
 394         }
 395
 396         /* Init FLASH_INTENSITY ctrl data */
 397         if (fled_cdev_ops->flash_brightness_set) {
 398                 ctrl_init_data[FLASH_INTENSITY].cid = V4L2_CID_FLASH_INTENSITY;
 399                 ctrl_cfg = &ctrl_init_data[FLASH_INTENSITY].config;
 400                 __lfs_to_v4l2_ctrl_config(&fled_cdev->brightness, ctrl_cfg);
 401                 ctrl_cfg->id = V4L2_CID_FLASH_INTENSITY;
 402                 ctrl_cfg->flags = V4L2_CTRL_FLAG_VOLATILE |
 403                                   V4L2_CTRL_FLAG_EXECUTE_ON_WRITE;
 404         }
 405 }
 406
 407 static int v4l2_flash_init_controls(struct v4l2_flash *v4l2_flash,
 408                                 struct v4l2_flash_config *flash_cfg)
 409
 410 {
 411         struct v4l2_flash_ctrl_data *ctrl_init_data;
 412         struct v4l2_ctrl *ctrl;
 413         struct v4l2_ctrl_config *ctrl_cfg;
 414         int i, ret, num_ctrls = 0;
 415
 416         v4l2_flash->ctrls = devm_kzalloc(v4l2_flash->sd.dev,
 417                                         sizeof(*v4l2_flash->ctrls) *
 418                                         (STROBE_SOURCE + 1), GFP_KERNEL);
 419         if (!v4l2_flash->ctrls)
 420                 return -ENOMEM;
 421
 422         /* allocate memory dynamically so as not to exceed stack frame size */
 423         ctrl_init_data = kcalloc(NUM_FLASH_CTRLS, sizeof(*ctrl_init_data),
 424                                         GFP_KERNEL);
 425         if (!ctrl_init_data)
 426                 return -ENOMEM;
 427
 428         __fill_ctrl_init_data(v4l2_flash, flash_cfg, ctrl_init_data);
 429
 430         for (i = 0; i < NUM_FLASH_CTRLS; ++i)
 431                 if (ctrl_init_data[i].cid)
 432                         ++num_ctrls;
 433
 434         v4l2_ctrl_handler_init(&v4l2_flash->hdl, num_ctrls);
 435
 436         for (i = 0; i < NUM_FLASH_CTRLS; ++i) {
 437                 ctrl_cfg = &ctrl_init_data[i].config;
 438                 if (!ctrl_init_data[i].cid)
 439                         continue;
 440
 441                 if (ctrl_cfg->id == V4L2_CID_FLASH_LED_MODE ||
 442                     ctrl_cfg->id == V4L2_CID_FLASH_STROBE_SOURCE)
 443                         ctrl = v4l2_ctrl_new_std_menu(&v4l2_flash->hdl,
 444                                                 &v4l2_flash_ctrl_ops,
 445                                                 ctrl_cfg->id,
 446                                                 ctrl_cfg->max,
 447                                                 ctrl_cfg->menu_skip_mask,
 448                                                 ctrl_cfg->def);
 449                 else
 450                         ctrl = v4l2_ctrl_new_std(&v4l2_flash->hdl,
 451                                                 &v4l2_flash_ctrl_ops,
 452                                                 ctrl_cfg->id,
 453                                                 ctrl_cfg->min,
 454                                                 ctrl_cfg->max,
 455                                                 ctrl_cfg->step,
 456                                                 ctrl_cfg->def);
 457
 458                 if (ctrl)
 459                         ctrl->flags |= ctrl_cfg->flags;
 460
 461                 if (i <= STROBE_SOURCE)
 462                         v4l2_flash->ctrls[i] = ctrl;
 463         }
 464
 465         kfree(ctrl_init_data);
 466
 467         if (v4l2_flash->hdl.error) {
 468                 ret = v4l2_flash->hdl.error;
 469                 goto error_free_handler;
 470         }
 471
 472         v4l2_ctrl_handler_setup(&v4l2_flash->hdl);
 473
 474         v4l2_flash->sd.ctrl_handler = &v4l2_flash->hdl;
 475
 476         return 0;
 477
 478 error_free_handler:
 479         v4l2_ctrl_handler_free(&v4l2_flash->hdl);
 480         return ret;
 481 }
 482
 483 static int __sync_device_with_v4l2_controls(struct v4l2_flash *v4l2_flash)
 484 {
 485         struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
 486         struct v4l2_ctrl **ctrls = v4l2_flash->ctrls;
 487         int ret = 0;
 488
 489         v4l2_flash_set_led_brightness(v4l2_flash, ctrls[TORCH_INTENSITY]);
 490
 491         if (ctrls[INDICATOR_INTENSITY])
 492                 v4l2_flash_set_led_brightness(v4l2_flash,
 493                                                 ctrls[INDICATOR_INTENSITY]);
 494
 495         if (ctrls[FLASH_TIMEOUT]) {
 496                 ret = led_set_flash_timeout(fled_cdev,
 497                                         ctrls[FLASH_TIMEOUT]->val);
 498                 if (ret < 0)
 499                         return ret;
 500         }
 501
 502         if (ctrls[FLASH_INTENSITY]) {
 503                 ret = led_set_flash_brightness(fled_cdev,
 504                                         ctrls[FLASH_INTENSITY]->val);
 505                 if (ret < 0)
 506                         return ret;
 507         }
 508
 509         /*
 510          * For some hardware arrangements setting strobe source may affect
 511          * torch mode. Synchronize strobe source setting only if not in torch
 512          * mode. For torch mode case it will get synchronized upon switching
 513          * to flash mode.
 514          */
 515         if (ctrls[STROBE_SOURCE] &&
 516             ctrls[LED_MODE]->val != V4L2_FLASH_LED_MODE_TORCH)
 517                 ret = call_flash_op(v4l2_flash, external_strobe_set,
 518                                         ctrls[STROBE_SOURCE]->val);
 519
 520         return ret;
 521 }
 522
 523 /*
 524  * V4L2 subdev internal operations
 525  */
 526
 527 static int v4l2_flash_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 528 {
 529         struct v4l2_flash *v4l2_flash = v4l2_subdev_to_v4l2_flash(sd);
 530         struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
 531         struct led_classdev *led_cdev = &fled_cdev->led_cdev;
 532         struct led_classdev_flash *iled_cdev = v4l2_flash->iled_cdev;
 533         struct led_classdev *led_cdev_ind = NULL;
 534         int ret = 0;
 535
 536         if (!v4l2_fh_is_singular(&fh->vfh))
 537                 return 0;
 538
 539         mutex_lock(&led_cdev->led_access);
 540
 541         led_sysfs_disable(led_cdev);
 542         led_trigger_remove(led_cdev);
 543
 544         mutex_unlock(&led_cdev->led_access);
 545
 546         if (iled_cdev) {
 547                 led_cdev_ind = &iled_cdev->led_cdev;
 548
 549                 mutex_lock(&led_cdev_ind->led_access);
 550
 551                 led_sysfs_disable(led_cdev_ind);
 552                 led_trigger_remove(led_cdev_ind);
 553
 554                 mutex_unlock(&led_cdev_ind->led_access);
 555         }
 556
 557         ret = __sync_device_with_v4l2_controls(v4l2_flash);
 558         if (ret < 0)
 559                 goto out_sync_device;
 560
 561         return 0;
 562 out_sync_device:
 563         mutex_lock(&led_cdev->led_access);
 564         led_sysfs_enable(led_cdev);
 565         mutex_unlock(&led_cdev->led_access);
 566
 567         if (led_cdev_ind) {
 568                 mutex_lock(&led_cdev_ind->led_access);
 569                 led_sysfs_enable(led_cdev_ind);
 570                 mutex_unlock(&led_cdev_ind->led_access);
 571         }
 572
 573         return ret;
 574 }
 575
 576 static int v4l2_flash_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 577 {
 578         struct v4l2_flash *v4l2_flash = v4l2_subdev_to_v4l2_flash(sd);
 579         struct led_classdev_flash *fled_cdev = v4l2_flash->fled_cdev;
 580         struct led_classdev *led_cdev = &fled_cdev->led_cdev;
 581         struct led_classdev_flash *iled_cdev = v4l2_flash->iled_cdev;
 582         int ret = 0;
 583
 584         if (!v4l2_fh_is_singular(&fh->vfh))
 585                 return 0;
 586
 587         mutex_lock(&led_cdev->led_access);
 588
 589         if (v4l2_flash->ctrls[STROBE_SOURCE])
 590                 ret = v4l2_ctrl_s_ctrl(v4l2_flash->ctrls[STROBE_SOURCE],
 591                                 V4L2_FLASH_STROBE_SOURCE_SOFTWARE);
 592         led_sysfs_enable(led_cdev);
 593
 594         mutex_unlock(&led_cdev->led_access);
 595
 596         if (iled_cdev) {
 597                 struct led_classdev *led_cdev_ind = &iled_cdev->led_cdev;
 598
 599                 mutex_lock(&led_cdev_ind->led_access);
 600                 led_sysfs_enable(led_cdev_ind);
 601                 mutex_unlock(&led_cdev_ind->led_access);
 602         }
 603
 604         return ret;
 605 }
 606
 607 static const struct v4l2_subdev_internal_ops v4l2_flash_subdev_internal_ops = {
 608         .open = v4l2_flash_open,
 609         .close = v4l2_flash_close,
 610 };
 611
 612 static const struct v4l2_subdev_core_ops v4l2_flash_core_ops = {
 613         .queryctrl = v4l2_subdev_queryctrl,
 614         .querymenu = v4l2_subdev_querymenu,
 615 };
 616
 617 static const struct v4l2_subdev_ops v4l2_flash_subdev_ops = {
 618         .core = &v4l2_flash_core_ops,
 619 };
 620
 621 struct v4l2_flash *v4l2_flash_init(
 622         struct device *dev, struct device_node *of_node,
 623         struct led_classdev_flash *fled_cdev,
 624         struct led_classdev_flash *iled_cdev,
 625         const struct v4l2_flash_ops *ops,
 626         struct v4l2_flash_config *config)
 627 {
 628         struct v4l2_flash *v4l2_flash;
 629         struct led_classdev *led_cdev;
 630         struct v4l2_subdev *sd;
 631         int ret;
 632
 633         if (!fled_cdev || !ops || !config)
 634                 return ERR_PTR(-EINVAL);
 635
 636         led_cdev = &fled_cdev->led_cdev;
 637
 638         v4l2_flash = devm_kzalloc(led_cdev->dev, sizeof(*v4l2_flash),
 639                                         GFP_KERNEL);
 640         if (!v4l2_flash)
 641                 return ERR_PTR(-ENOMEM);
 642
 643         sd = &v4l2_flash->sd;
 644         v4l2_flash->fled_cdev = fled_cdev;
 645         v4l2_flash->iled_cdev = iled_cdev;
 646         v4l2_flash->ops = ops;
 647         sd->dev = dev;
 648         sd->of_node = of_node;
 649         v4l2_subdev_init(sd, &v4l2_flash_subdev_ops);
 650         sd->internal_ops = &v4l2_flash_subdev_internal_ops;
 651         sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 652         strlcpy(sd->name, config->dev_name, sizeof(sd->name));
 653
 654         ret = media_entity_init(&sd->entity, 0, NULL, 0);
 655         if (ret < 0)
 656                 return ERR_PTR(ret);
 657
 658         sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;
 659
 660         ret = v4l2_flash_init_controls(v4l2_flash, config);
 661         if (ret < 0)
 662                 goto err_init_controls;
 663
 664         if (sd->of_node)
 665                 of_node_get(sd->of_node);
 666         else
 667                 of_node_get(led_cdev->dev->of_node);
 668
 669         ret = v4l2_async_register_subdev(sd);
 670         if (ret < 0)
 671                 goto err_async_register_sd;
 672
 673         return v4l2_flash;
 674
 675 err_async_register_sd:
 676         of_node_put(led_cdev->dev->of_node);
 677         v4l2_ctrl_handler_free(sd->ctrl_handler);
 678 err_init_controls:
 679         media_entity_cleanup(&sd->entity);
 680
 681         return ERR_PTR(ret);
 682 }
 683 EXPORT_SYMBOL_GPL(v4l2_flash_init);
 684
 685 void v4l2_flash_release(struct v4l2_flash *v4l2_flash)
 686 {
 687         struct v4l2_subdev *sd;
 688         struct led_classdev *led_cdev;
 689
 690         if (IS_ERR_OR_NULL(v4l2_flash))
 691                 return;
 692
 693         sd = &v4l2_flash->sd;
 694         led_cdev = &v4l2_flash->fled_cdev->led_cdev;
 695
 696         v4l2_async_unregister_subdev(sd);
 697
 698         if (sd->of_node)
 699                 of_node_put(sd->of_node);
 700         else
 701                 of_node_put(led_cdev->dev->of_node);
 702
 703         v4l2_ctrl_handler_free(sd->ctrl_handler);
 704         media_entity_cleanup(&sd->entity);
 705 }
 706 EXPORT_SYMBOL_GPL(v4l2_flash_release);
 707
 708 MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>");
 709 MODULE_DESCRIPTION("V4L2 Flash sub-device helpers");
 710 MODULE_LICENSE("GPL v2");