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