drivers/staging/greybus/light.c

   1 /*
   2  * Greybus Lights protocol driver.
   3  *
   4  * Copyright 2015 Google Inc.
   5  * Copyright 2015 Linaro Ltd.
   6  *
   7  * Released under the GPLv2 only.
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/leds.h>
  12 #include <linux/led-class-flash.h>
  13 #include <linux/module.h>
  14 #include <linux/slab.h>
  15 #include <linux/version.h>
  16 #include <media/v4l2-flash-led-class.h>
  17
  18 #include "greybus.h"
  19 #include "greybus_protocols.h"
  20
  21 #define NAMES_MAX       32
  22
  23 struct gb_channel {
  24         u8                              id;
  25         u32                             flags;
  26         u32                             color;
  27         char                            *color_name;
  28         u8                              fade_in;
  29         u8                              fade_out;
  30         u32                             mode;
  31         char                            *mode_name;
  32         struct attribute                **attrs;
  33         struct attribute_group          *attr_group;
  34         const struct attribute_group    **attr_groups;
  35         struct led_classdev             *led;
  36 #if IS_REACHABLE(CONFIG_LEDS_CLASS_FLASH)
  37         struct led_classdev_flash       fled;
  38         struct led_flash_setting        intensity_uA;
  39         struct led_flash_setting        timeout_us;
  40 #else
  41         struct led_classdev             cled;
  42 #endif
  43         struct gb_light                 *light;
  44         bool                            is_registered;
  45         bool                            releasing;
  46         bool                            strobe_state;
  47         bool                            active;
  48         struct mutex                    lock;
  49 };
  50
  51 struct gb_light {
  52         u8                      id;
  53         char                    *name;
  54         struct gb_lights        *glights;
  55         u32                     flags;
  56         u8                      channels_count;
  57         struct gb_channel       *channels;
  58         bool                    has_flash;
  59         bool                    ready;
  60 #if IS_REACHABLE(CONFIG_V4L2_FLASH_LED_CLASS)
  61         struct v4l2_flash       *v4l2_flash;
  62 #endif
  63 };
  64
  65 struct gb_lights {
  66         struct gb_connection    *connection;
  67         u8                      lights_count;
  68         struct gb_light         *lights;
  69         struct mutex            lights_lock;
  70 };
  71
  72 static void gb_lights_channel_free(struct gb_channel *channel);
  73
  74 static struct gb_connection *get_conn_from_channel(struct gb_channel *channel)
  75 {
  76         return channel->light->glights->connection;
  77 }
  78
  79 static struct gb_connection *get_conn_from_light(struct gb_light *light)
  80 {
  81         return light->glights->connection;
  82 }
  83
  84 static bool is_channel_flash(struct gb_channel *channel)
  85 {
  86         return !!(channel->mode & (GB_CHANNEL_MODE_FLASH | GB_CHANNEL_MODE_TORCH
  87                                    | GB_CHANNEL_MODE_INDICATOR));
  88 }
  89
  90 #if IS_REACHABLE(CONFIG_LEDS_CLASS_FLASH)
  91 static struct gb_channel *get_channel_from_cdev(struct led_classdev *cdev)
  92 {
  93         struct led_classdev_flash *fled_cdev = lcdev_to_flcdev(cdev);
  94
  95         return container_of(fled_cdev, struct gb_channel, fled);
  96 }
  97
  98 static struct led_classdev *get_channel_cdev(struct gb_channel *channel)
  99 {
 100         return &channel->fled.led_cdev;
 101 }
 102
 103 static struct gb_channel *get_channel_from_mode(struct gb_light *light,
 104                                                 u32 mode)
 105 {
 106         struct gb_channel *channel = NULL;
 107         int i;
 108
 109         for (i = 0; i < light->channels_count; i++) {
 110                 channel = &light->channels[i];
 111                 if (channel && channel->mode == mode)
 112                         break;
 113         }
 114         return channel;
 115 }
 116
 117 static int __gb_lights_flash_intensity_set(struct gb_channel *channel,
 118                                            u32 intensity)
 119 {
 120         struct gb_connection *connection = get_conn_from_channel(channel);
 121         struct gb_bundle *bundle = connection->bundle;
 122         struct gb_lights_set_flash_intensity_request req;
 123         int ret;
 124
 125         if (channel->releasing)
 126                 return -ESHUTDOWN;
 127
 128         ret = gb_pm_runtime_get_sync(bundle);
 129         if (ret < 0)
 130                 return ret;
 131
 132         req.light_id = channel->light->id;
 133         req.channel_id = channel->id;
 134         req.intensity_uA = cpu_to_le32(intensity);
 135
 136         ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_FLASH_INTENSITY,
 137                                 &req, sizeof(req), NULL, 0);
 138
 139         gb_pm_runtime_put_autosuspend(bundle);
 140
 141         return ret;
 142 }
 143
 144 static int __gb_lights_flash_brightness_set(struct gb_channel *channel)
 145 {
 146         u32 intensity;
 147
 148         /* If the channel is flash we need to get the attached torch channel */
 149         if (channel->mode & GB_CHANNEL_MODE_FLASH)
 150                 channel = get_channel_from_mode(channel->light,
 151                                                 GB_CHANNEL_MODE_TORCH);
 152
 153         /* For not flash we need to convert brightness to intensity */
 154         intensity = channel->intensity_uA.min +
 155                         (channel->intensity_uA.step * channel->led->brightness);
 156
 157         return __gb_lights_flash_intensity_set(channel, intensity);
 158 }
 159 #else
 160 static struct gb_channel *get_channel_from_cdev(struct led_classdev *cdev)
 161 {
 162         return container_of(cdev, struct gb_channel, cled);
 163 }
 164
 165 static struct led_classdev *get_channel_cdev(struct gb_channel *channel)
 166 {
 167         return &channel->cled;
 168 }
 169
 170 static int __gb_lights_flash_brightness_set(struct gb_channel *channel)
 171 {
 172         return 0;
 173 }
 174 #endif
 175
 176 static int gb_lights_color_set(struct gb_channel *channel, u32 color);
 177 static int gb_lights_fade_set(struct gb_channel *channel);
 178
 179 static void led_lock(struct led_classdev *cdev)
 180 {
 181         mutex_lock(&cdev->led_access);
 182 }
 183
 184 static void led_unlock(struct led_classdev *cdev)
 185 {
 186         mutex_unlock(&cdev->led_access);
 187 }
 188
 189 #define gb_lights_fade_attr(__dir)                                      \
 190 static ssize_t fade_##__dir##_show(struct device *dev,                  \
 191                                    struct device_attribute *attr,       \
 192                                    char *buf)                           \
 193 {                                                                       \
 194         struct led_classdev *cdev = dev_get_drvdata(dev);               \
 195         struct gb_channel *channel = get_channel_from_cdev(cdev);       \
 196                                                                         \
 197         return sprintf(buf, "%u\n", channel->fade_##__dir);             \
 198 }                                                                       \
 199                                                                         \
 200 static ssize_t fade_##__dir##_store(struct device *dev,                 \
 201                                     struct device_attribute *attr,      \
 202                                     const char *buf, size_t size)       \
 203 {                                                                       \
 204         struct led_classdev *cdev = dev_get_drvdata(dev);               \
 205         struct gb_channel *channel = get_channel_from_cdev(cdev);       \
 206         u8 fade;                                                        \
 207         int ret;                                                        \
 208                                                                         \
 209         led_lock(cdev);                                                 \
 210         if (led_sysfs_is_disabled(cdev)) {                              \
 211                 ret = -EBUSY;                                           \
 212                 goto unlock;                                            \
 213         }                                                               \
 214                                                                         \
 215         ret = kstrtou8(buf, 0, &fade);                                  \
 216         if (ret < 0) {                                                  \
 217                 dev_err(dev, "could not parse fade value %d\n", ret);   \
 218                 goto unlock;                                            \
 219         }                                                               \
 220         if (channel->fade_##__dir == fade)                              \
 221                 goto unlock;                                            \
 222         channel->fade_##__dir = fade;                                   \
 223                                                                         \
 224         ret = gb_lights_fade_set(channel);                              \
 225         if (ret < 0)                                                    \
 226                 goto unlock;                                            \
 227                                                                         \
 228         ret = size;                                                     \
 229 unlock:                                                                 \
 230         led_unlock(cdev);                                               \
 231         return ret;                                                     \
 232 }                                                                       \
 233 static DEVICE_ATTR_RW(fade_##__dir)
 234
 235 gb_lights_fade_attr(in);
 236 gb_lights_fade_attr(out);
 237
 238 static ssize_t color_show(struct device *dev, struct device_attribute *attr,
 239                           char *buf)
 240 {
 241         struct led_classdev *cdev = dev_get_drvdata(dev);
 242         struct gb_channel *channel = get_channel_from_cdev(cdev);
 243
 244         return sprintf(buf, "0x%08x\n", channel->color);
 245 }
 246
 247 static ssize_t color_store(struct device *dev, struct device_attribute *attr,
 248                            const char *buf, size_t size)
 249 {
 250         struct led_classdev *cdev = dev_get_drvdata(dev);
 251         struct gb_channel *channel = get_channel_from_cdev(cdev);
 252         u32 color;
 253         int ret;
 254
 255         led_lock(cdev);
 256         if (led_sysfs_is_disabled(cdev)) {
 257                 ret = -EBUSY;
 258                 goto unlock;
 259         }
 260         ret = kstrtou32(buf, 0, &color);
 261         if (ret < 0) {
 262                 dev_err(dev, "could not parse color value %d\n", ret);
 263                 goto unlock;
 264         }
 265
 266         ret = gb_lights_color_set(channel, color);
 267         if (ret < 0)
 268                 goto unlock;
 269
 270         channel->color = color;
 271         ret = size;
 272 unlock:
 273         led_unlock(cdev);
 274         return ret;
 275 }
 276 static DEVICE_ATTR_RW(color);
 277
 278 static int channel_attr_groups_set(struct gb_channel *channel,
 279                                    struct led_classdev *cdev)
 280 {
 281         int attr = 0;
 282         int size = 0;
 283
 284         if (channel->flags & GB_LIGHT_CHANNEL_MULTICOLOR)
 285                 size++;
 286         if (channel->flags & GB_LIGHT_CHANNEL_FADER)
 287                 size += 2;
 288
 289         if (!size)
 290                 return 0;
 291
 292         /* Set attributes based in the channel flags */
 293         channel->attrs = kcalloc(size + 1, sizeof(*channel->attrs), GFP_KERNEL);
 294         if (!channel->attrs)
 295                 return -ENOMEM;
 296         channel->attr_group = kcalloc(1, sizeof(*channel->attr_group),
 297                                       GFP_KERNEL);
 298         if (!channel->attr_group)
 299                 return -ENOMEM;
 300         channel->attr_groups = kcalloc(2, sizeof(*channel->attr_groups),
 301                                        GFP_KERNEL);
 302         if (!channel->attr_groups)
 303                 return -ENOMEM;
 304
 305         if (channel->flags & GB_LIGHT_CHANNEL_MULTICOLOR)
 306                 channel->attrs[attr++] = &dev_attr_color.attr;
 307         if (channel->flags & GB_LIGHT_CHANNEL_FADER) {
 308                 channel->attrs[attr++] = &dev_attr_fade_in.attr;
 309                 channel->attrs[attr++] = &dev_attr_fade_out.attr;
 310         }
 311
 312         channel->attr_group->attrs = channel->attrs;
 313
 314         channel->attr_groups[0] = channel->attr_group;
 315
 316         cdev->groups = channel->attr_groups;
 317
 318         return 0;
 319 }
 320
 321 static int gb_lights_fade_set(struct gb_channel *channel)
 322 {
 323         struct gb_connection *connection = get_conn_from_channel(channel);
 324         struct gb_bundle *bundle = connection->bundle;
 325         struct gb_lights_set_fade_request req;
 326         int ret;
 327
 328         if (channel->releasing)
 329                 return -ESHUTDOWN;
 330
 331         ret = gb_pm_runtime_get_sync(bundle);
 332         if (ret < 0)
 333                 return ret;
 334
 335         req.light_id = channel->light->id;
 336         req.channel_id = channel->id;
 337         req.fade_in = channel->fade_in;
 338         req.fade_out = channel->fade_out;
 339         ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_FADE,
 340                                 &req, sizeof(req), NULL, 0);
 341
 342         gb_pm_runtime_put_autosuspend(bundle);
 343
 344         return ret;
 345 }
 346
 347 static int gb_lights_color_set(struct gb_channel *channel, u32 color)
 348 {
 349         struct gb_connection *connection = get_conn_from_channel(channel);
 350         struct gb_bundle *bundle = connection->bundle;
 351         struct gb_lights_set_color_request req;
 352         int ret;
 353
 354         if (channel->releasing)
 355                 return -ESHUTDOWN;
 356
 357         ret = gb_pm_runtime_get_sync(bundle);
 358         if (ret < 0)
 359                 return ret;
 360
 361         req.light_id = channel->light->id;
 362         req.channel_id = channel->id;
 363         req.color = cpu_to_le32(color);
 364         ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_COLOR,
 365                                 &req, sizeof(req), NULL, 0);
 366
 367         gb_pm_runtime_put_autosuspend(bundle);
 368
 369         return ret;
 370 }
 371
 372 static int __gb_lights_led_brightness_set(struct gb_channel *channel)
 373 {
 374         struct gb_lights_set_brightness_request req;
 375         struct gb_connection *connection = get_conn_from_channel(channel);
 376         struct gb_bundle *bundle = connection->bundle;
 377         bool old_active;
 378         int ret;
 379
 380         mutex_lock(&channel->lock);
 381         ret = gb_pm_runtime_get_sync(bundle);
 382         if (ret < 0)
 383                 goto out_unlock;
 384
 385         old_active = channel->active;
 386
 387         req.light_id = channel->light->id;
 388         req.channel_id = channel->id;
 389         req.brightness = (u8)channel->led->brightness;
 390
 391         ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_BRIGHTNESS,
 392                                 &req, sizeof(req), NULL, 0);
 393         if (ret < 0)
 394                 goto out_pm_put;
 395
 396         if (channel->led->brightness)
 397                 channel->active = true;
 398         else
 399                 channel->active = false;
 400
 401         /* we need to keep module alive when turning to active state */
 402         if (!old_active && channel->active)
 403                 goto out_unlock;
 404
 405         /*
 406          * on the other hand if going to inactive we still hold a reference and
 407          * need to put it, so we could go to suspend.
 408          */
 409         if (old_active && !channel->active)
 410                 gb_pm_runtime_put_autosuspend(bundle);
 411
 412 out_pm_put:
 413         gb_pm_runtime_put_autosuspend(bundle);
 414 out_unlock:
 415         mutex_unlock(&channel->lock);
 416
 417         return ret;
 418 }
 419
 420 static int __gb_lights_brightness_set(struct gb_channel *channel)
 421 {
 422         int ret;
 423
 424         if (channel->releasing)
 425                 return 0;
 426
 427         if (is_channel_flash(channel))
 428                 ret = __gb_lights_flash_brightness_set(channel);
 429         else
 430                 ret = __gb_lights_led_brightness_set(channel);
 431
 432         return ret;
 433 }
 434
 435 static int gb_brightness_set(struct led_classdev *cdev,
 436                              enum led_brightness value)
 437 {
 438         struct gb_channel *channel = get_channel_from_cdev(cdev);
 439
 440         channel->led->brightness = value;
 441
 442         return __gb_lights_brightness_set(channel);
 443 }
 444
 445 static enum led_brightness gb_brightness_get(struct led_classdev *cdev)
 446
 447 {
 448         struct gb_channel *channel = get_channel_from_cdev(cdev);
 449
 450         return channel->led->brightness;
 451 }
 452
 453 static int gb_blink_set(struct led_classdev *cdev, unsigned long *delay_on,
 454                         unsigned long *delay_off)
 455 {
 456         struct gb_channel *channel = get_channel_from_cdev(cdev);
 457         struct gb_connection *connection = get_conn_from_channel(channel);
 458         struct gb_bundle *bundle = connection->bundle;
 459         struct gb_lights_blink_request req;
 460         bool old_active;
 461         int ret;
 462
 463         if (channel->releasing)
 464                 return -ESHUTDOWN;
 465
 466         if (!delay_on || !delay_off)
 467                 return -EINVAL;
 468
 469         mutex_lock(&channel->lock);
 470         ret = gb_pm_runtime_get_sync(bundle);
 471         if (ret < 0)
 472                 goto out_unlock;
 473
 474         old_active = channel->active;
 475
 476         req.light_id = channel->light->id;
 477         req.channel_id = channel->id;
 478         req.time_on_ms = cpu_to_le16(*delay_on);
 479         req.time_off_ms = cpu_to_le16(*delay_off);
 480
 481         ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_BLINK, &req,
 482                                 sizeof(req), NULL, 0);
 483         if (ret < 0)
 484                 goto out_pm_put;
 485
 486         if (*delay_on)
 487                 channel->active = true;
 488         else
 489                 channel->active = false;
 490
 491         /* we need to keep module alive when turning to active state */
 492         if (!old_active && channel->active)
 493                 goto out_unlock;
 494
 495         /*
 496          * on the other hand if going to inactive we still hold a reference and
 497          * need to put it, so we could go to suspend.
 498          */
 499         if (old_active && !channel->active)
 500                 gb_pm_runtime_put_autosuspend(bundle);
 501
 502 out_pm_put:
 503         gb_pm_runtime_put_autosuspend(bundle);
 504 out_unlock:
 505         mutex_unlock(&channel->lock);
 506
 507         return ret;
 508 }
 509
 510 static void gb_lights_led_operations_set(struct gb_channel *channel,
 511                                          struct led_classdev *cdev)
 512 {
 513         cdev->brightness_get = gb_brightness_get;
 514         cdev->brightness_set_blocking = gb_brightness_set;
 515
 516         if (channel->flags & GB_LIGHT_CHANNEL_BLINK)
 517                 cdev->blink_set = gb_blink_set;
 518 }
 519
 520 #if IS_REACHABLE(CONFIG_V4L2_FLASH_LED_CLASS)
 521 /* V4L2 specific helpers */
 522 static const struct v4l2_flash_ops v4l2_flash_ops;
 523
 524 static void __gb_lights_channel_v4l2_config(struct led_flash_setting *channel_s,
 525                                             struct led_flash_setting *v4l2_s)
 526 {
 527         v4l2_s->min = channel_s->min;
 528         v4l2_s->max = channel_s->max;
 529         v4l2_s->step = channel_s->step;
 530         /* For v4l2 val is the default value */
 531         v4l2_s->val = channel_s->max;
 532 }
 533
 534 static int gb_lights_light_v4l2_register(struct gb_light *light)
 535 {
 536         struct gb_connection *connection = get_conn_from_light(light);
 537         struct device *dev = &connection->bundle->dev;
 538         struct v4l2_flash_config *sd_cfg;
 539         struct led_classdev_flash *fled;
 540         struct led_classdev_flash *iled = NULL;
 541         struct gb_channel *channel_torch, *channel_ind, *channel_flash;
 542         int ret = 0;
 543
 544         sd_cfg = kcalloc(1, sizeof(*sd_cfg), GFP_KERNEL);
 545         if (!sd_cfg)
 546                 return -ENOMEM;
 547
 548         channel_torch = get_channel_from_mode(light, GB_CHANNEL_MODE_TORCH);
 549         if (channel_torch)
 550                 __gb_lights_channel_v4l2_config(&channel_torch->intensity_uA,
 551                                                 &sd_cfg->torch_intensity);
 552
 553         channel_ind = get_channel_from_mode(light, GB_CHANNEL_MODE_INDICATOR);
 554         if (channel_ind) {
 555                 __gb_lights_channel_v4l2_config(&channel_ind->intensity_uA,
 556                                                 &sd_cfg->indicator_intensity);
 557                 iled = &channel_ind->fled;
 558         }
 559
 560         channel_flash = get_channel_from_mode(light, GB_CHANNEL_MODE_FLASH);
 561         WARN_ON(!channel_flash);
 562
 563         fled = &channel_flash->fled;
 564
 565         snprintf(sd_cfg->dev_name, sizeof(sd_cfg->dev_name), "%s", light->name);
 566
 567         /* Set the possible values to faults, in our case all faults */
 568         sd_cfg->flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
 569                 LED_FAULT_OVER_TEMPERATURE | LED_FAULT_SHORT_CIRCUIT |
 570                 LED_FAULT_OVER_CURRENT | LED_FAULT_INDICATOR |
 571                 LED_FAULT_UNDER_VOLTAGE | LED_FAULT_INPUT_VOLTAGE |
 572                 LED_FAULT_LED_OVER_TEMPERATURE;
 573
 574         light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, iled,
 575                                             &v4l2_flash_ops, sd_cfg);
 576         if (IS_ERR_OR_NULL(light->v4l2_flash)) {
 577                 ret = PTR_ERR(light->v4l2_flash);
 578                 goto out_free;
 579         }
 580
 581         return ret;
 582
 583 out_free:
 584         kfree(sd_cfg);
 585         return ret;
 586 }
 587
 588 static void gb_lights_light_v4l2_unregister(struct gb_light *light)
 589 {
 590         v4l2_flash_release(light->v4l2_flash);
 591 }
 592 #else
 593 static int gb_lights_light_v4l2_register(struct gb_light *light)
 594 {
 595         struct gb_connection *connection = get_conn_from_light(light);
 596
 597         dev_err(&connection->bundle->dev, "no support for v4l2 subdevices\n");
 598         return 0;
 599 }
 600
 601 static void gb_lights_light_v4l2_unregister(struct gb_light *light)
 602 {
 603 }
 604 #endif
 605
 606 #if IS_REACHABLE(CONFIG_LEDS_CLASS_FLASH)
 607 /* Flash specific operations */
 608 static int gb_lights_flash_intensity_set(struct led_classdev_flash *fcdev,
 609                                          u32 brightness)
 610 {
 611         struct gb_channel *channel = container_of(fcdev, struct gb_channel,
 612                                                   fled);
 613         int ret;
 614
 615         ret = __gb_lights_flash_intensity_set(channel, brightness);
 616         if (ret < 0)
 617                 return ret;
 618
 619         fcdev->brightness.val = brightness;
 620
 621         return 0;
 622 }
 623
 624 static int gb_lights_flash_intensity_get(struct led_classdev_flash *fcdev,
 625                                          u32 *brightness)
 626 {
 627         *brightness = fcdev->brightness.val;
 628
 629         return 0;
 630 }
 631
 632 static int gb_lights_flash_strobe_set(struct led_classdev_flash *fcdev,
 633                                       bool state)
 634 {
 635         struct gb_channel *channel = container_of(fcdev, struct gb_channel,
 636                                                   fled);
 637         struct gb_connection *connection = get_conn_from_channel(channel);
 638         struct gb_bundle *bundle = connection->bundle;
 639         struct gb_lights_set_flash_strobe_request req;
 640         int ret;
 641
 642         if (channel->releasing)
 643                 return -ESHUTDOWN;
 644
 645         ret = gb_pm_runtime_get_sync(bundle);
 646         if (ret < 0)
 647                 return ret;
 648
 649         req.light_id = channel->light->id;
 650         req.channel_id = channel->id;
 651         req.state = state ? 1 : 0;
 652
 653         ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_FLASH_STROBE,
 654                                 &req, sizeof(req), NULL, 0);
 655         if (!ret)
 656                 channel->strobe_state = state;
 657
 658         gb_pm_runtime_put_autosuspend(bundle);
 659
 660         return ret;
 661 }
 662
 663 static int gb_lights_flash_strobe_get(struct led_classdev_flash *fcdev,
 664                                       bool *state)
 665 {
 666         struct gb_channel *channel = container_of(fcdev, struct gb_channel,
 667                                                   fled);
 668
 669         *state = channel->strobe_state;
 670         return 0;
 671 }
 672
 673 static int gb_lights_flash_timeout_set(struct led_classdev_flash *fcdev,
 674                                        u32 timeout)
 675 {
 676         struct gb_channel *channel = container_of(fcdev, struct gb_channel,
 677                                                   fled);
 678         struct gb_connection *connection = get_conn_from_channel(channel);
 679         struct gb_bundle *bundle = connection->bundle;
 680         struct gb_lights_set_flash_timeout_request req;
 681         int ret;
 682
 683         if (channel->releasing)
 684                 return -ESHUTDOWN;
 685
 686         ret = gb_pm_runtime_get_sync(bundle);
 687         if (ret < 0)
 688                 return ret;
 689
 690         req.light_id = channel->light->id;
 691         req.channel_id = channel->id;
 692         req.timeout_us = cpu_to_le32(timeout);
 693
 694         ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_FLASH_TIMEOUT,
 695                                 &req, sizeof(req), NULL, 0);
 696         if (!ret)
 697                 fcdev->timeout.val = timeout;
 698
 699         gb_pm_runtime_put_autosuspend(bundle);
 700
 701         return ret;
 702 }
 703
 704 static int gb_lights_flash_fault_get(struct led_classdev_flash *fcdev,
 705                                      u32 *fault)
 706 {
 707         struct gb_channel *channel = container_of(fcdev, struct gb_channel,
 708                                                   fled);
 709         struct gb_connection *connection = get_conn_from_channel(channel);
 710         struct gb_bundle *bundle = connection->bundle;
 711         struct gb_lights_get_flash_fault_request req;
 712         struct gb_lights_get_flash_fault_response resp;
 713         int ret;
 714
 715         if (channel->releasing)
 716                 return -ESHUTDOWN;
 717
 718         ret = gb_pm_runtime_get_sync(bundle);
 719         if (ret < 0)
 720                 return ret;
 721
 722         req.light_id = channel->light->id;
 723         req.channel_id = channel->id;
 724
 725         ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_GET_FLASH_FAULT,
 726                                 &req, sizeof(req), &resp, sizeof(resp));
 727         if (!ret)
 728                 *fault = le32_to_cpu(resp.fault);
 729
 730         gb_pm_runtime_put_autosuspend(bundle);
 731
 732         return ret;
 733 }
 734
 735 static const struct led_flash_ops gb_lights_flash_ops = {
 736         .flash_brightness_set   = gb_lights_flash_intensity_set,
 737         .flash_brightness_get   = gb_lights_flash_intensity_get,
 738         .strobe_set             = gb_lights_flash_strobe_set,
 739         .strobe_get             = gb_lights_flash_strobe_get,
 740         .timeout_set            = gb_lights_flash_timeout_set,
 741         .fault_get              = gb_lights_flash_fault_get,
 742 };
 743
 744 static int __gb_lights_channel_torch_attach(struct gb_channel *channel,
 745                                             struct gb_channel *channel_torch)
 746 {
 747         char *name;
 748
 749         /* we can only attach torch to a flash channel */
 750         if (!(channel->mode & GB_CHANNEL_MODE_FLASH))
 751                 return 0;
 752
 753         /* Move torch brightness to the destination */
 754         channel->led->max_brightness = channel_torch->led->max_brightness;
 755
 756         /* append mode name to flash name */
 757         name = kasprintf(GFP_KERNEL, "%s_%s", channel->led->name,
 758                          channel_torch->mode_name);
 759         if (!name)
 760                 return -ENOMEM;
 761         kfree(channel->led->name);
 762         channel->led->name = name;
 763
 764         channel_torch->led = channel->led;
 765
 766         return 0;
 767 }
 768
 769 static int __gb_lights_flash_led_register(struct gb_channel *channel)
 770 {
 771         struct gb_connection *connection = get_conn_from_channel(channel);
 772         struct led_classdev_flash *fled = &channel->fled;
 773         struct led_flash_setting *fset;
 774         struct gb_channel *channel_torch;
 775         int ret;
 776
 777         fled->ops = &gb_lights_flash_ops;
 778
 779         fled->led_cdev.flags |= LED_DEV_CAP_FLASH;
 780
 781         fset = &fled->brightness;
 782         fset->min = channel->intensity_uA.min;
 783         fset->max = channel->intensity_uA.max;
 784         fset->step = channel->intensity_uA.step;
 785         fset->val = channel->intensity_uA.max;
 786
 787         /* Only the flash mode have the timeout constraints settings */
 788         if (channel->mode & GB_CHANNEL_MODE_FLASH) {
 789                 fset = &fled->timeout;
 790                 fset->min = channel->timeout_us.min;
 791                 fset->max = channel->timeout_us.max;
 792                 fset->step = channel->timeout_us.step;
 793                 fset->val = channel->timeout_us.max;
 794         }
 795
 796         /*
 797          * If light have torch mode channel, this channel will be the led
 798          * classdev of the registered above flash classdev
 799          */
 800         channel_torch = get_channel_from_mode(channel->light,
 801                                               GB_CHANNEL_MODE_TORCH);
 802         if (channel_torch) {
 803                 ret = __gb_lights_channel_torch_attach(channel, channel_torch);
 804                 if (ret < 0)
 805                         goto fail;
 806         }
 807
 808         ret = led_classdev_flash_register(&connection->bundle->dev, fled);
 809         if (ret < 0)
 810                 goto fail;
 811
 812         channel->is_registered = true;
 813         return 0;
 814 fail:
 815         channel->led = NULL;
 816         return ret;
 817 }
 818
 819 static void __gb_lights_flash_led_unregister(struct gb_channel *channel)
 820 {
 821         if (!channel->is_registered)
 822                 return;
 823
 824         led_classdev_flash_unregister(&channel->fled);
 825 }
 826
 827 static int gb_lights_channel_flash_config(struct gb_channel *channel)
 828 {
 829         struct gb_connection *connection = get_conn_from_channel(channel);
 830         struct gb_lights_get_channel_flash_config_request req;
 831         struct gb_lights_get_channel_flash_config_response conf;
 832         struct led_flash_setting *fset;
 833         int ret;
 834
 835         req.light_id = channel->light->id;
 836         req.channel_id = channel->id;
 837
 838         ret = gb_operation_sync(connection,
 839                                 GB_LIGHTS_TYPE_GET_CHANNEL_FLASH_CONFIG,
 840                                 &req, sizeof(req), &conf, sizeof(conf));
 841         if (ret < 0)
 842                 return ret;
 843
 844         /*
 845          * Intensity constraints for flash related modes: flash, torch,
 846          * indicator.  They will be needed for v4l2 registration.
 847          */
 848         fset = &channel->intensity_uA;
 849         fset->min = le32_to_cpu(conf.intensity_min_uA);
 850         fset->max = le32_to_cpu(conf.intensity_max_uA);
 851         fset->step = le32_to_cpu(conf.intensity_step_uA);
 852
 853         /*
 854          * On flash type, max brightness is set as the number of intensity steps
 855          * available.
 856          */
 857         channel->led->max_brightness = (fset->max - fset->min) / fset->step;
 858
 859         /* Only the flash mode have the timeout constraints settings */
 860         if (channel->mode & GB_CHANNEL_MODE_FLASH) {
 861                 fset = &channel->timeout_us;
 862                 fset->min = le32_to_cpu(conf.timeout_min_us);
 863                 fset->max = le32_to_cpu(conf.timeout_max_us);
 864                 fset->step = le32_to_cpu(conf.timeout_step_us);
 865         }
 866
 867         return 0;
 868 }
 869 #else
 870 static int gb_lights_channel_flash_config(struct gb_channel *channel)
 871 {
 872         struct gb_connection *connection = get_conn_from_channel(channel);
 873
 874         dev_err(&connection->bundle->dev, "no support for flash devices\n");
 875         return 0;
 876 }
 877
 878 static int __gb_lights_flash_led_register(struct gb_channel *channel)
 879 {
 880         return 0;
 881 }
 882
 883 static void __gb_lights_flash_led_unregister(struct gb_channel *channel)
 884 {
 885 }
 886
 887 #endif
 888
 889 static int __gb_lights_led_register(struct gb_channel *channel)
 890 {
 891         struct gb_connection *connection = get_conn_from_channel(channel);
 892         struct led_classdev *cdev = get_channel_cdev(channel);
 893         int ret;
 894
 895         ret = led_classdev_register(&connection->bundle->dev, cdev);
 896         if (ret < 0)
 897                 channel->led = NULL;
 898         else
 899                 channel->is_registered = true;
 900         return ret;
 901 }
 902
 903 static int gb_lights_channel_register(struct gb_channel *channel)
 904 {
 905         /* Normal LED channel, just register in led classdev and we are done */
 906         if (!is_channel_flash(channel))
 907                 return __gb_lights_led_register(channel);
 908
 909         /*
 910          * Flash Type need more work, register flash classdev, indicator as
 911          * flash classdev, torch will be led classdev of the flash classdev.
 912          */
 913         if (!(channel->mode & GB_CHANNEL_MODE_TORCH))
 914                 return __gb_lights_flash_led_register(channel);
 915
 916         return 0;
 917 }
 918
 919 static void __gb_lights_led_unregister(struct gb_channel *channel)
 920 {
 921         struct led_classdev *cdev = get_channel_cdev(channel);
 922
 923         if (!channel->is_registered)
 924                 return;
 925
 926         led_classdev_unregister(cdev);
 927         kfree(cdev->name);
 928         cdev->name = NULL;
 929         channel->led = NULL;
 930 }
 931
 932 static void gb_lights_channel_unregister(struct gb_channel *channel)
 933 {
 934         /* The same as register, handle channels differently */
 935         if (!is_channel_flash(channel)) {
 936                 __gb_lights_led_unregister(channel);
 937                 return;
 938         }
 939
 940         if (channel->mode & GB_CHANNEL_MODE_TORCH)
 941                 __gb_lights_led_unregister(channel);
 942         else
 943                 __gb_lights_flash_led_unregister(channel);
 944 }
 945
 946 static int gb_lights_channel_config(struct gb_light *light,
 947                                     struct gb_channel *channel)
 948 {
 949         struct gb_lights_get_channel_config_response conf;
 950         struct gb_lights_get_channel_config_request req;
 951         struct gb_connection *connection = get_conn_from_light(light);
 952         struct led_classdev *cdev = get_channel_cdev(channel);
 953         char *name;
 954         int ret;
 955
 956         req.light_id = light->id;
 957         req.channel_id = channel->id;
 958
 959         ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_GET_CHANNEL_CONFIG,
 960                                 &req, sizeof(req), &conf, sizeof(conf));
 961         if (ret < 0)
 962                 return ret;
 963
 964         channel->light = light;
 965         channel->mode = le32_to_cpu(conf.mode);
 966         channel->flags = le32_to_cpu(conf.flags);
 967         channel->color = le32_to_cpu(conf.color);
 968         channel->color_name = kstrndup(conf.color_name, NAMES_MAX, GFP_KERNEL);
 969         if (!channel->color_name)
 970                 return -ENOMEM;
 971         channel->mode_name = kstrndup(conf.mode_name, NAMES_MAX, GFP_KERNEL);
 972         if (!channel->mode_name)
 973                 return -ENOMEM;
 974
 975         channel->led = cdev;
 976
 977         name = kasprintf(GFP_KERNEL, "%s:%s:%s", light->name,
 978                          channel->color_name, channel->mode_name);
 979         if (!name)
 980                 return -ENOMEM;
 981
 982         cdev->name = name;
 983
 984         cdev->max_brightness = conf.max_brightness;
 985
 986         ret = channel_attr_groups_set(channel, cdev);
 987         if (ret < 0)
 988                 return ret;
 989
 990         gb_lights_led_operations_set(channel, cdev);
 991
 992         /*
 993          * If it is not a flash related channel (flash, torch or indicator) we
 994          * are done here. If not, continue and fetch flash related
 995          * configurations.
 996          */
 997         if (!is_channel_flash(channel))
 998                 return ret;
 999
1000         light->has_flash = true;
1001
1002         ret = gb_lights_channel_flash_config(channel);
1003         if (ret < 0)
1004                 return ret;
1005
1006         return ret;
1007 }
1008
1009 static int gb_lights_light_config(struct gb_lights *glights, u8 id)
1010 {
1011         struct gb_light *light = &glights->lights[id];
1012         struct gb_lights_get_light_config_request req;
1013         struct gb_lights_get_light_config_response conf;
1014         int ret;
1015         int i;
1016
1017         light->glights = glights;
1018         light->id = id;
1019
1020         req.id = id;
1021
1022         ret = gb_operation_sync(glights->connection,
1023                                 GB_LIGHTS_TYPE_GET_LIGHT_CONFIG,
1024                                 &req, sizeof(req), &conf, sizeof(conf));
1025         if (ret < 0)
1026                 return ret;
1027
1028         if (!conf.channel_count)
1029                 return -EINVAL;
1030         if (!strlen(conf.name))
1031                 return -EINVAL;
1032
1033         light->channels_count = conf.channel_count;
1034         light->name = kstrndup(conf.name, NAMES_MAX, GFP_KERNEL);
1035
1036         light->channels = kzalloc(light->channels_count *
1037                                   sizeof(struct gb_channel), GFP_KERNEL);
1038         if (!light->channels)
1039                 return -ENOMEM;
1040
1041         /* First we collect all the configurations for all channels */
1042         for (i = 0; i < light->channels_count; i++) {
1043                 light->channels[i].id = i;
1044                 ret = gb_lights_channel_config(light, &light->channels[i]);
1045                 if (ret < 0)
1046                         return ret;
1047         }
1048
1049         return 0;
1050 }
1051
1052 static int gb_lights_light_register(struct gb_light *light)
1053 {
1054         int ret;
1055         int i;
1056
1057         /*
1058          * Then, if everything went ok in getting configurations, we register
1059          * the classdev, flash classdev and v4l2 subsystem, if a flash device is
1060          * found.
1061          */
1062         for (i = 0; i < light->channels_count; i++) {
1063                 ret = gb_lights_channel_register(&light->channels[i]);
1064                 if (ret < 0)
1065                         return ret;
1066
1067                 mutex_init(&light->channels[i].lock);
1068         }
1069
1070         light->ready = true;
1071
1072         if (light->has_flash) {
1073                 ret = gb_lights_light_v4l2_register(light);
1074                 if (ret < 0) {
1075                         light->has_flash = false;
1076                         return ret;
1077                 }
1078         }
1079
1080         return 0;
1081 }
1082
1083 static void gb_lights_channel_free(struct gb_channel *channel)
1084 {
1085         kfree(channel->attrs);
1086         kfree(channel->attr_group);
1087         kfree(channel->attr_groups);
1088         kfree(channel->color_name);
1089         kfree(channel->mode_name);
1090         mutex_destroy(&channel->lock);
1091 }
1092
1093 static void gb_lights_channel_release(struct gb_channel *channel)
1094 {
1095         channel->releasing = true;
1096
1097         gb_lights_channel_unregister(channel);
1098
1099         gb_lights_channel_free(channel);
1100 }
1101
1102 static void gb_lights_light_release(struct gb_light *light)
1103 {
1104         int i;
1105
1106         light->ready = false;
1107
1108         if (light->has_flash)
1109                 gb_lights_light_v4l2_unregister(light);
1110         light->has_flash = false;
1111
1112         for (i = 0; i < light->channels_count; i++)
1113                 gb_lights_channel_release(&light->channels[i]);
1114         light->channels_count = 0;
1115
1116         kfree(light->channels);
1117         light->channels = NULL;
1118         kfree(light->name);
1119         light->name = NULL;
1120 }
1121
1122 static void gb_lights_release(struct gb_lights *glights)
1123 {
1124         int i;
1125
1126         if (!glights)
1127                 return;
1128
1129         mutex_lock(&glights->lights_lock);
1130         if (!glights->lights)
1131                 goto free_glights;
1132
1133         for (i = 0; i < glights->lights_count; i++)
1134                 gb_lights_light_release(&glights->lights[i]);
1135
1136         kfree(glights->lights);
1137
1138 free_glights:
1139         mutex_unlock(&glights->lights_lock);
1140         mutex_destroy(&glights->lights_lock);
1141         kfree(glights);
1142 }
1143
1144 static int gb_lights_get_count(struct gb_lights *glights)
1145 {
1146         struct gb_lights_get_lights_response resp;
1147         int ret;
1148
1149         ret = gb_operation_sync(glights->connection, GB_LIGHTS_TYPE_GET_LIGHTS,
1150                                 NULL, 0, &resp, sizeof(resp));
1151         if (ret < 0)
1152                 return ret;
1153
1154         if (!resp.lights_count)
1155                 return -EINVAL;
1156
1157         glights->lights_count = resp.lights_count;
1158
1159         return 0;
1160 }
1161
1162 static int gb_lights_create_all(struct gb_lights *glights)
1163 {
1164         struct gb_connection *connection = glights->connection;
1165         int ret;
1166         int i;
1167
1168         mutex_lock(&glights->lights_lock);
1169         ret = gb_lights_get_count(glights);
1170         if (ret < 0)
1171                 goto out;
1172
1173         glights->lights = kzalloc(glights->lights_count *
1174                                   sizeof(struct gb_light), GFP_KERNEL);
1175         if (!glights->lights) {
1176                 ret = -ENOMEM;
1177                 goto out;
1178         }
1179
1180         for (i = 0; i < glights->lights_count; i++) {
1181                 ret = gb_lights_light_config(glights, i);
1182                 if (ret < 0) {
1183                         dev_err(&connection->bundle->dev,
1184                                 "Fail to configure lights device\n");
1185                         goto out;
1186                 }
1187         }
1188
1189 out:
1190         mutex_unlock(&glights->lights_lock);
1191         return ret;
1192 }
1193
1194 static int gb_lights_register_all(struct gb_lights *glights)
1195 {
1196         struct gb_connection *connection = glights->connection;
1197         int ret = 0;
1198         int i;
1199
1200         mutex_lock(&glights->lights_lock);
1201         for (i = 0; i < glights->lights_count; i++) {
1202                 ret = gb_lights_light_register(&glights->lights[i]);
1203                 if (ret < 0) {
1204                         dev_err(&connection->bundle->dev,
1205                                 "Fail to enable lights device\n");
1206                         break;
1207                 }
1208         }
1209
1210         mutex_unlock(&glights->lights_lock);
1211         return ret;
1212 }
1213
1214 static int gb_lights_request_handler(struct gb_operation *op)
1215 {
1216         struct gb_connection *connection = op->connection;
1217         struct device *dev = &connection->bundle->dev;
1218         struct gb_lights *glights = gb_connection_get_data(connection);
1219         struct gb_light *light;
1220         struct gb_message *request;
1221         struct gb_lights_event_request *payload;
1222         int ret =  0;
1223         u8 light_id;
1224         u8 event;
1225
1226         if (op->type != GB_LIGHTS_TYPE_EVENT) {
1227                 dev_err(dev, "Unsupported unsolicited event: %u\n", op->type);
1228                 return -EINVAL;
1229         }
1230
1231         request = op->request;
1232
1233         if (request->payload_size < sizeof(*payload)) {
1234                 dev_err(dev, "Wrong event size received (%zu < %zu)\n",
1235                         request->payload_size, sizeof(*payload));
1236                 return -EINVAL;
1237         }
1238
1239         payload = request->payload;
1240         light_id = payload->light_id;
1241
1242         if (light_id >= glights->lights_count ||
1243             !glights->lights[light_id].ready) {
1244                 dev_err(dev, "Event received for unconfigured light id: %d\n",
1245                         light_id);
1246                 return -EINVAL;
1247         }
1248
1249         event = payload->event;
1250
1251         if (event & GB_LIGHTS_LIGHT_CONFIG) {
1252                 light = &glights->lights[light_id];
1253
1254                 mutex_lock(&glights->lights_lock);
1255                 gb_lights_light_release(light);
1256                 ret = gb_lights_light_config(glights, light_id);
1257                 if (!ret)
1258                         ret = gb_lights_light_register(light);
1259                 if (ret < 0)
1260                         gb_lights_light_release(light);
1261                 mutex_unlock(&glights->lights_lock);
1262         }
1263
1264         return ret;
1265 }
1266
1267 static int gb_lights_probe(struct gb_bundle *bundle,
1268                            const struct greybus_bundle_id *id)
1269 {
1270         struct greybus_descriptor_cport *cport_desc;
1271         struct gb_connection *connection;
1272         struct gb_lights *glights;
1273         int ret;
1274
1275         if (bundle->num_cports != 1)
1276                 return -ENODEV;
1277
1278         cport_desc = &bundle->cport_desc[0];
1279         if (cport_desc->protocol_id != GREYBUS_PROTOCOL_LIGHTS)
1280                 return -ENODEV;
1281
1282         glights = kzalloc(sizeof(*glights), GFP_KERNEL);
1283         if (!glights)
1284                 return -ENOMEM;
1285
1286         mutex_init(&glights->lights_lock);
1287
1288         connection = gb_connection_create(bundle, le16_to_cpu(cport_desc->id),
1289                                           gb_lights_request_handler);
1290         if (IS_ERR(connection)) {
1291                 ret = PTR_ERR(connection);
1292                 goto out;
1293         }
1294
1295         glights->connection = connection;
1296         gb_connection_set_data(connection, glights);
1297
1298         greybus_set_drvdata(bundle, glights);
1299
1300         /* We aren't ready to receive an incoming request yet */
1301         ret = gb_connection_enable_tx(connection);
1302         if (ret)
1303                 goto error_connection_destroy;
1304
1305         /*
1306          * Setup all the lights devices over this connection, if anything goes
1307          * wrong tear down all lights
1308          */
1309         ret = gb_lights_create_all(glights);
1310         if (ret < 0)
1311                 goto error_connection_disable;
1312
1313         /* We are ready to receive an incoming request now, enable RX as well */
1314         ret = gb_connection_enable(connection);
1315         if (ret)
1316                 goto error_connection_disable;
1317
1318         /* Enable & register lights */
1319         ret = gb_lights_register_all(glights);
1320         if (ret < 0)
1321                 goto error_connection_disable;
1322
1323         gb_pm_runtime_put_autosuspend(bundle);
1324
1325         return 0;
1326
1327 error_connection_disable:
1328         gb_connection_disable(connection);
1329 error_connection_destroy:
1330         gb_connection_destroy(connection);
1331 out:
1332         gb_lights_release(glights);
1333         return ret;
1334 }
1335
1336 static void gb_lights_disconnect(struct gb_bundle *bundle)
1337 {
1338         struct gb_lights *glights = greybus_get_drvdata(bundle);
1339
1340         if (gb_pm_runtime_get_sync(bundle))
1341                 gb_pm_runtime_get_noresume(bundle);
1342
1343         gb_connection_disable(glights->connection);
1344         gb_connection_destroy(glights->connection);
1345
1346         gb_lights_release(glights);
1347 }
1348
1349 static const struct greybus_bundle_id gb_lights_id_table[] = {
1350         { GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_LIGHTS) },
1351         { }
1352 };
1353 MODULE_DEVICE_TABLE(greybus, gb_lights_id_table);
1354
1355 static struct greybus_driver gb_lights_driver = {
1356         .name           = "lights",
1357         .probe          = gb_lights_probe,
1358         .disconnect     = gb_lights_disconnect,
1359         .id_table       = gb_lights_id_table,
1360 };
1361 module_greybus_driver(gb_lights_driver);
1362
1363 MODULE_LICENSE("GPL v2");