drivers/media/platform/vimc/vimc-sensor.c

   1 /*
   2  * vimc-sensor.c Virtual Media Controller Driver
   3  *
   4  * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #include <linux/component.h>
  19 #include <linux/freezer.h>
  20 #include <linux/kthread.h>
  21 #include <linux/module.h>
  22 #include <linux/mod_devicetable.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/v4l2-mediabus.h>
  25 #include <linux/vmalloc.h>
  26 #include <media/v4l2-ctrls.h>
  27 #include <media/v4l2-event.h>
  28 #include <media/v4l2-subdev.h>
  29 #include <media/tpg/v4l2-tpg.h>
  30
  31 #include "vimc-common.h"
  32
  33 #define VIMC_SEN_DRV_NAME "vimc-sensor"
  34
  35 struct vimc_sen_device {
  36         struct vimc_ent_device ved;
  37         struct v4l2_subdev sd;
  38         struct device *dev;
  39         struct tpg_data tpg;
  40         struct task_struct *kthread_sen;
  41         u8 *frame;
  42         /* The active format */
  43         struct v4l2_mbus_framefmt mbus_format;
  44         struct v4l2_ctrl_handler hdl;
  45 };
  46
  47 static const struct v4l2_mbus_framefmt fmt_default = {
  48         .width = 640,
  49         .height = 480,
  50         .code = MEDIA_BUS_FMT_RGB888_1X24,
  51         .field = V4L2_FIELD_NONE,
  52         .colorspace = V4L2_COLORSPACE_DEFAULT,
  53 };
  54
  55 static int vimc_sen_init_cfg(struct v4l2_subdev *sd,
  56                              struct v4l2_subdev_pad_config *cfg)
  57 {
  58         unsigned int i;
  59
  60         for (i = 0; i < sd->entity.num_pads; i++) {
  61                 struct v4l2_mbus_framefmt *mf;
  62
  63                 mf = v4l2_subdev_get_try_format(sd, cfg, i);
  64                 *mf = fmt_default;
  65         }
  66
  67         return 0;
  68 }
  69
  70 static int vimc_sen_enum_mbus_code(struct v4l2_subdev *sd,
  71                                    struct v4l2_subdev_pad_config *cfg,
  72                                    struct v4l2_subdev_mbus_code_enum *code)
  73 {
  74         const struct vimc_pix_map *vpix = vimc_pix_map_by_index(code->index);
  75
  76         if (!vpix)
  77                 return -EINVAL;
  78
  79         code->code = vpix->code;
  80
  81         return 0;
  82 }
  83
  84 static int vimc_sen_enum_frame_size(struct v4l2_subdev *sd,
  85                                     struct v4l2_subdev_pad_config *cfg,
  86                                     struct v4l2_subdev_frame_size_enum *fse)
  87 {
  88         const struct vimc_pix_map *vpix;
  89
  90         if (fse->index)
  91                 return -EINVAL;
  92
  93         /* Only accept code in the pix map table */
  94         vpix = vimc_pix_map_by_code(fse->code);
  95         if (!vpix)
  96                 return -EINVAL;
  97
  98         fse->min_width = VIMC_FRAME_MIN_WIDTH;
  99         fse->max_width = VIMC_FRAME_MAX_WIDTH;
 100         fse->min_height = VIMC_FRAME_MIN_HEIGHT;
 101         fse->max_height = VIMC_FRAME_MAX_HEIGHT;
 102
 103         return 0;
 104 }
 105
 106 static int vimc_sen_get_fmt(struct v4l2_subdev *sd,
 107                             struct v4l2_subdev_pad_config *cfg,
 108                             struct v4l2_subdev_format *fmt)
 109 {
 110         struct vimc_sen_device *vsen =
 111                                 container_of(sd, struct vimc_sen_device, sd);
 112
 113         fmt->format = fmt->which == V4L2_SUBDEV_FORMAT_TRY ?
 114                       *v4l2_subdev_get_try_format(sd, cfg, fmt->pad) :
 115                       vsen->mbus_format;
 116
 117         return 0;
 118 }
 119
 120 static void vimc_sen_tpg_s_format(struct vimc_sen_device *vsen)
 121 {
 122         const struct vimc_pix_map *vpix =
 123                                 vimc_pix_map_by_code(vsen->mbus_format.code);
 124
 125         tpg_reset_source(&vsen->tpg, vsen->mbus_format.width,
 126                          vsen->mbus_format.height, vsen->mbus_format.field);
 127         tpg_s_bytesperline(&vsen->tpg, 0, vsen->mbus_format.width * vpix->bpp);
 128         tpg_s_buf_height(&vsen->tpg, vsen->mbus_format.height);
 129         tpg_s_fourcc(&vsen->tpg, vpix->pixelformat);
 130         /* TODO: add support for V4L2_FIELD_ALTERNATE */
 131         tpg_s_field(&vsen->tpg, vsen->mbus_format.field, false);
 132         tpg_s_colorspace(&vsen->tpg, vsen->mbus_format.colorspace);
 133         tpg_s_ycbcr_enc(&vsen->tpg, vsen->mbus_format.ycbcr_enc);
 134         tpg_s_quantization(&vsen->tpg, vsen->mbus_format.quantization);
 135         tpg_s_xfer_func(&vsen->tpg, vsen->mbus_format.xfer_func);
 136 }
 137
 138 static void vimc_sen_adjust_fmt(struct v4l2_mbus_framefmt *fmt)
 139 {
 140         const struct vimc_pix_map *vpix;
 141
 142         /* Only accept code in the pix map table */
 143         vpix = vimc_pix_map_by_code(fmt->code);
 144         if (!vpix)
 145                 fmt->code = fmt_default.code;
 146
 147         fmt->width = clamp_t(u32, fmt->width, VIMC_FRAME_MIN_WIDTH,
 148                              VIMC_FRAME_MAX_WIDTH) & ~1;
 149         fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT,
 150                               VIMC_FRAME_MAX_HEIGHT) & ~1;
 151
 152         /* TODO: add support for V4L2_FIELD_ALTERNATE */
 153         if (fmt->field == V4L2_FIELD_ANY || fmt->field == V4L2_FIELD_ALTERNATE)
 154                 fmt->field = fmt_default.field;
 155
 156         vimc_colorimetry_clamp(fmt);
 157 }
 158
 159 static int vimc_sen_set_fmt(struct v4l2_subdev *sd,
 160                             struct v4l2_subdev_pad_config *cfg,
 161                             struct v4l2_subdev_format *fmt)
 162 {
 163         struct vimc_sen_device *vsen = v4l2_get_subdevdata(sd);
 164         struct v4l2_mbus_framefmt *mf;
 165
 166         if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
 167                 /* Do not change the format while stream is on */
 168                 if (vsen->frame)
 169                         return -EBUSY;
 170
 171                 mf = &vsen->mbus_format;
 172         } else {
 173                 mf = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
 174         }
 175
 176         /* Set the new format */
 177         vimc_sen_adjust_fmt(&fmt->format);
 178
 179         dev_dbg(vsen->dev, "%s: format update: "
 180                 "old:%dx%d (0x%x, %d, %d, %d, %d) "
 181                 "new:%dx%d (0x%x, %d, %d, %d, %d)\n", vsen->sd.name,
 182                 /* old */
 183                 mf->width, mf->height, mf->code,
 184                 mf->colorspace, mf->quantization,
 185                 mf->xfer_func, mf->ycbcr_enc,
 186                 /* new */
 187                 fmt->format.width, fmt->format.height, fmt->format.code,
 188                 fmt->format.colorspace, fmt->format.quantization,
 189                 fmt->format.xfer_func, fmt->format.ycbcr_enc);
 190
 191         *mf = fmt->format;
 192
 193         return 0;
 194 }
 195
 196 static const struct v4l2_subdev_pad_ops vimc_sen_pad_ops = {
 197         .init_cfg               = vimc_sen_init_cfg,
 198         .enum_mbus_code         = vimc_sen_enum_mbus_code,
 199         .enum_frame_size        = vimc_sen_enum_frame_size,
 200         .get_fmt                = vimc_sen_get_fmt,
 201         .set_fmt                = vimc_sen_set_fmt,
 202 };
 203
 204 static int vimc_sen_tpg_thread(void *data)
 205 {
 206         struct vimc_sen_device *vsen = data;
 207         unsigned int i;
 208
 209         set_freezable();
 210         set_current_state(TASK_UNINTERRUPTIBLE);
 211
 212         for (;;) {
 213                 try_to_freeze();
 214                 if (kthread_should_stop())
 215                         break;
 216
 217                 tpg_fill_plane_buffer(&vsen->tpg, 0, 0, vsen->frame);
 218
 219                 /* Send the frame to all source pads */
 220                 for (i = 0; i < vsen->sd.entity.num_pads; i++)
 221                         vimc_propagate_frame(&vsen->sd.entity.pads[i],
 222                                              vsen->frame);
 223
 224                 /* 60 frames per second */
 225                 schedule_timeout(HZ/60);
 226         }
 227
 228         return 0;
 229 }
 230
 231 static int vimc_sen_s_stream(struct v4l2_subdev *sd, int enable)
 232 {
 233         struct vimc_sen_device *vsen =
 234                                 container_of(sd, struct vimc_sen_device, sd);
 235         int ret;
 236
 237         if (enable) {
 238                 const struct vimc_pix_map *vpix;
 239                 unsigned int frame_size;
 240
 241                 if (vsen->kthread_sen)
 242                         /* tpg is already executing */
 243                         return 0;
 244
 245                 /* Calculate the frame size */
 246                 vpix = vimc_pix_map_by_code(vsen->mbus_format.code);
 247                 frame_size = vsen->mbus_format.width * vpix->bpp *
 248                              vsen->mbus_format.height;
 249
 250                 /*
 251                  * Allocate the frame buffer. Use vmalloc to be able to
 252                  * allocate a large amount of memory
 253                  */
 254                 vsen->frame = vmalloc(frame_size);
 255                 if (!vsen->frame)
 256                         return -ENOMEM;
 257
 258                 /* configure the test pattern generator */
 259                 vimc_sen_tpg_s_format(vsen);
 260
 261                 /* Initialize the image generator thread */
 262                 vsen->kthread_sen = kthread_run(vimc_sen_tpg_thread, vsen,
 263                                         "%s-sen", vsen->sd.v4l2_dev->name);
 264                 if (IS_ERR(vsen->kthread_sen)) {
 265                         dev_err(vsen->dev, "%s: kernel_thread() failed\n",
 266                                 vsen->sd.name);
 267                         vfree(vsen->frame);
 268                         vsen->frame = NULL;
 269                         return PTR_ERR(vsen->kthread_sen);
 270                 }
 271         } else {
 272                 if (!vsen->kthread_sen)
 273                         return 0;
 274
 275                 /* Stop image generator */
 276                 ret = kthread_stop(vsen->kthread_sen);
 277                 if (ret)
 278                         return ret;
 279
 280                 vsen->kthread_sen = NULL;
 281                 vfree(vsen->frame);
 282                 vsen->frame = NULL;
 283                 return 0;
 284         }
 285
 286         return 0;
 287 }
 288
 289 static struct v4l2_subdev_core_ops vimc_sen_core_ops = {
 290         .log_status = v4l2_ctrl_subdev_log_status,
 291         .subscribe_event = v4l2_ctrl_subdev_subscribe_event,
 292         .unsubscribe_event = v4l2_event_subdev_unsubscribe,
 293 };
 294
 295 static const struct v4l2_subdev_video_ops vimc_sen_video_ops = {
 296         .s_stream = vimc_sen_s_stream,
 297 };
 298
 299 static const struct v4l2_subdev_ops vimc_sen_ops = {
 300         .core = &vimc_sen_core_ops,
 301         .pad = &vimc_sen_pad_ops,
 302         .video = &vimc_sen_video_ops,
 303 };
 304
 305 static int vimc_sen_s_ctrl(struct v4l2_ctrl *ctrl)
 306 {
 307         struct vimc_sen_device *vsen =
 308                 container_of(ctrl->handler, struct vimc_sen_device, hdl);
 309
 310         switch (ctrl->id) {
 311         case VIMC_CID_TEST_PATTERN:
 312                 tpg_s_pattern(&vsen->tpg, ctrl->val);
 313                 break;
 314         case V4L2_CID_HFLIP:
 315                 tpg_s_hflip(&vsen->tpg, ctrl->val);
 316                 break;
 317         case V4L2_CID_VFLIP:
 318                 tpg_s_vflip(&vsen->tpg, ctrl->val);
 319                 break;
 320         default:
 321                 return -EINVAL;
 322         }
 323         return 0;
 324 }
 325
 326 static const struct v4l2_ctrl_ops vimc_sen_ctrl_ops = {
 327         .s_ctrl = vimc_sen_s_ctrl,
 328 };
 329
 330 static void vimc_sen_comp_unbind(struct device *comp, struct device *master,
 331                                  void *master_data)
 332 {
 333         struct vimc_ent_device *ved = dev_get_drvdata(comp);
 334         struct vimc_sen_device *vsen =
 335                                 container_of(ved, struct vimc_sen_device, ved);
 336
 337         vimc_ent_sd_unregister(ved, &vsen->sd);
 338         v4l2_ctrl_handler_free(&vsen->hdl);
 339         tpg_free(&vsen->tpg);
 340         kfree(vsen);
 341 }
 342
 343 /* Image Processing Controls */
 344 static const struct v4l2_ctrl_config vimc_sen_ctrl_class = {
 345         .flags = V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY,
 346         .id = VIMC_CID_VIMC_CLASS,
 347         .name = "VIMC Controls",
 348         .type = V4L2_CTRL_TYPE_CTRL_CLASS,
 349 };
 350
 351 static const struct v4l2_ctrl_config vimc_sen_ctrl_test_pattern = {
 352         .ops = &vimc_sen_ctrl_ops,
 353         .id = VIMC_CID_TEST_PATTERN,
 354         .name = "Test Pattern",
 355         .type = V4L2_CTRL_TYPE_MENU,
 356         .max = TPG_PAT_NOISE,
 357         .qmenu = tpg_pattern_strings,
 358 };
 359
 360 static int vimc_sen_comp_bind(struct device *comp, struct device *master,
 361                               void *master_data)
 362 {
 363         struct v4l2_device *v4l2_dev = master_data;
 364         struct vimc_platform_data *pdata = comp->platform_data;
 365         struct vimc_sen_device *vsen;
 366         int ret;
 367
 368         /* Allocate the vsen struct */
 369         vsen = kzalloc(sizeof(*vsen), GFP_KERNEL);
 370         if (!vsen)
 371                 return -ENOMEM;
 372
 373         v4l2_ctrl_handler_init(&vsen->hdl, 4);
 374
 375         v4l2_ctrl_new_custom(&vsen->hdl, &vimc_sen_ctrl_class, NULL);
 376         v4l2_ctrl_new_custom(&vsen->hdl, &vimc_sen_ctrl_test_pattern, NULL);
 377         v4l2_ctrl_new_std(&vsen->hdl, &vimc_sen_ctrl_ops,
 378                           V4L2_CID_VFLIP, 0, 1, 1, 0);
 379         v4l2_ctrl_new_std(&vsen->hdl, &vimc_sen_ctrl_ops,
 380                           V4L2_CID_HFLIP, 0, 1, 1, 0);
 381         vsen->sd.ctrl_handler = &vsen->hdl;
 382         if (vsen->hdl.error) {
 383                 ret = vsen->hdl.error;
 384                 goto err_free_vsen;
 385         }
 386
 387         /* Initialize ved and sd */
 388         ret = vimc_ent_sd_register(&vsen->ved, &vsen->sd, v4l2_dev,
 389                                    pdata->entity_name,
 390                                    MEDIA_ENT_F_CAM_SENSOR, 1,
 391                                    (const unsigned long[1]) {MEDIA_PAD_FL_SOURCE},
 392                                    &vimc_sen_ops);
 393         if (ret)
 394                 goto err_free_hdl;
 395
 396         dev_set_drvdata(comp, &vsen->ved);
 397         vsen->dev = comp;
 398
 399         /* Initialize the frame format */
 400         vsen->mbus_format = fmt_default;
 401
 402         /* Initialize the test pattern generator */
 403         tpg_init(&vsen->tpg, vsen->mbus_format.width,
 404                  vsen->mbus_format.height);
 405         ret = tpg_alloc(&vsen->tpg, VIMC_FRAME_MAX_WIDTH);
 406         if (ret)
 407                 goto err_unregister_ent_sd;
 408
 409         return 0;
 410
 411 err_unregister_ent_sd:
 412         vimc_ent_sd_unregister(&vsen->ved,  &vsen->sd);
 413 err_free_hdl:
 414         v4l2_ctrl_handler_free(&vsen->hdl);
 415 err_free_vsen:
 416         kfree(vsen);
 417
 418         return ret;
 419 }
 420
 421 static const struct component_ops vimc_sen_comp_ops = {
 422         .bind = vimc_sen_comp_bind,
 423         .unbind = vimc_sen_comp_unbind,
 424 };
 425
 426 static int vimc_sen_probe(struct platform_device *pdev)
 427 {
 428         return component_add(&pdev->dev, &vimc_sen_comp_ops);
 429 }
 430
 431 static int vimc_sen_remove(struct platform_device *pdev)
 432 {
 433         component_del(&pdev->dev, &vimc_sen_comp_ops);
 434
 435         return 0;
 436 }
 437
 438 static const struct platform_device_id vimc_sen_driver_ids[] = {
 439         {
 440                 .name           = VIMC_SEN_DRV_NAME,
 441         },
 442         { }
 443 };
 444
 445 static struct platform_driver vimc_sen_pdrv = {
 446         .probe          = vimc_sen_probe,
 447         .remove         = vimc_sen_remove,
 448         .id_table       = vimc_sen_driver_ids,
 449         .driver         = {
 450                 .name   = VIMC_SEN_DRV_NAME,
 451         },
 452 };
 453
 454 module_platform_driver(vimc_sen_pdrv);
 455
 456 MODULE_DEVICE_TABLE(platform, vimc_sen_driver_ids);
 457
 458 MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Sensor");
 459 MODULE_AUTHOR("Helen Mae Koike Fornazier <helen.fornazier@gmail.com>");
 460 MODULE_LICENSE("GPL");