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 <media/v4l2-flash-led-class.h>
  16
  17 #include "greybus.h"
  18 #include "greybus_protocols.h"
  19
  20 #define NAMES_MAX       32
  21
  22 struct gb_channel {
  23         u8                              id;
  24         u32                             flags;
  25         u32                             color;
  26         char                            *color_name;
  27         u8                              fade_in;
  28         u8                              fade_out;
  29         u32                             mode;
  30         char                            *mode_name;
  31         struct attribute                **attrs;
  32         struct attribute_group          *attr_group;
  33         const struct attribute_group    **attr_groups;
  34         struct led_classdev             *led;
  35 #if IS_REACHABLE(CONFIG_LEDS_CLASS_FLASH)
  36         struct led_classdev_flash       fled;
  37         struct led_flash_setting        intensity_uA;
  38         struct led_flash_setting        timeout_us;
  39 #else
  40         struct led_classdev             cled;
  41 #endif
  42         struct gb_light                 *light;
  43         bool                            is_registered;
  44         bool                            releasing;
  45         bool                            strobe_state;
  46         bool                            active;
  47         struct mutex                    lock;
  48 };
  49
  50 struct gb_light {
  51         u8                      id;
  52         char                    *name;
  53         struct gb_lights        *glights;
  54         u32                     flags;
  55         u8                      channels_count;
  56         struct gb_channel       *channels;
  57         bool                    has_flash;
  58         bool                    ready;
  59 #if IS_REACHABLE(CONFIG_V4L2_FLASH_LED_CLASS)
  60         struct v4l2_flash       *v4l2_flash;
  61         struct v4l2_flash       *v4l2_flash_ind;
  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 = { {0} }, sd_cfg_ind = { {0} };
 539         struct led_classdev_flash *fled;
 540         struct led_classdev *iled = NULL;
 541         struct gb_channel *channel_torch, *channel_ind, *channel_flash;
 542
 543         channel_torch = get_channel_from_mode(light, GB_CHANNEL_MODE_TORCH);
 544         if (channel_torch)
 545                 __gb_lights_channel_v4l2_config(&channel_torch->intensity_uA,
 546                                                 &sd_cfg.intensity);
 547
 548         channel_ind = get_channel_from_mode(light, GB_CHANNEL_MODE_INDICATOR);
 549         if (channel_ind) {
 550                 __gb_lights_channel_v4l2_config(&channel_ind->intensity_uA,
 551                                                 &sd_cfg_ind.intensity);
 552                 iled = &channel_ind->fled.led_cdev;
 553         }
 554
 555         channel_flash = get_channel_from_mode(light, GB_CHANNEL_MODE_FLASH);
 556         WARN_ON(!channel_flash);
 557
 558         fled = &channel_flash->fled;
 559
 560         snprintf(sd_cfg.dev_name, sizeof(sd_cfg.dev_name), "%s", light->name);
 561         snprintf(sd_cfg_ind.dev_name, sizeof(sd_cfg_ind.dev_name),
 562                  "%s indicator", light->name);
 563
 564         /* Set the possible values to faults, in our case all faults */
 565         sd_cfg.flash_faults = LED_FAULT_OVER_VOLTAGE | LED_FAULT_TIMEOUT |
 566                 LED_FAULT_OVER_TEMPERATURE | LED_FAULT_SHORT_CIRCUIT |
 567                 LED_FAULT_OVER_CURRENT | LED_FAULT_INDICATOR |
 568                 LED_FAULT_UNDER_VOLTAGE | LED_FAULT_INPUT_VOLTAGE |
 569                 LED_FAULT_LED_OVER_TEMPERATURE;
 570
 571         light->v4l2_flash = v4l2_flash_init(dev, NULL, fled, &v4l2_flash_ops,
 572                                             &sd_cfg);
 573         if (IS_ERR(light->v4l2_flash))
 574                 return PTR_ERR(light->v4l2_flash);
 575
 576         if (channel_ind) {
 577                 light->v4l2_flash_ind =
 578                         v4l2_flash_indicator_init(dev, NULL, iled, &sd_cfg_ind);
 579                 if (IS_ERR(light->v4l2_flash_ind)) {
 580                         v4l2_flash_release(light->v4l2_flash);
 581                         return PTR_ERR(light->v4l2_flash_ind);
 582                 }
 583         }
 584
 585         return 0;
 586 }
 587
 588 static void gb_lights_light_v4l2_unregister(struct gb_light *light)
 589 {
 590         v4l2_flash_release(light->v4l2_flash_ind);
 591         v4l2_flash_release(light->v4l2_flash);
 592 }
 593 #else
 594 static int gb_lights_light_v4l2_register(struct gb_light *light)
 595 {
 596         struct gb_connection *connection = get_conn_from_light(light);
 597
 598         dev_err(&connection->bundle->dev, "no support for v4l2 subdevices\n");
 599         return 0;
 600 }
 601
 602 static void gb_lights_light_v4l2_unregister(struct gb_light *light)
 603 {
 604 }
 605 #endif
 606
 607 #if IS_REACHABLE(CONFIG_LEDS_CLASS_FLASH)
 608 /* Flash specific operations */
 609 static int gb_lights_flash_intensity_set(struct led_classdev_flash *fcdev,
 610                                          u32 brightness)
 611 {
 612         struct gb_channel *channel = container_of(fcdev, struct gb_channel,
 613                                                   fled);
 614         int ret;
 615
 616         ret = __gb_lights_flash_intensity_set(channel, brightness);
 617         if (ret < 0)
 618                 return ret;
 619
 620         fcdev->brightness.val = brightness;
 621
 622         return 0;
 623 }
 624
 625 static int gb_lights_flash_intensity_get(struct led_classdev_flash *fcdev,
 626                                          u32 *brightness)
 627 {
 628         *brightness = fcdev->brightness.val;
 629
 630         return 0;
 631 }
 632
 633 static int gb_lights_flash_strobe_set(struct led_classdev_flash *fcdev,
 634                                       bool state)
 635 {
 636         struct gb_channel *channel = container_of(fcdev, struct gb_channel,
 637                                                   fled);
 638         struct gb_connection *connection = get_conn_from_channel(channel);
 639         struct gb_bundle *bundle = connection->bundle;
 640         struct gb_lights_set_flash_strobe_request req;
 641         int ret;
 642
 643         if (channel->releasing)
 644                 return -ESHUTDOWN;
 645
 646         ret = gb_pm_runtime_get_sync(bundle);
 647         if (ret < 0)
 648                 return ret;
 649
 650         req.light_id = channel->light->id;
 651         req.channel_id = channel->id;
 652         req.state = state ? 1 : 0;
 653
 654         ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_FLASH_STROBE,
 655                                 &req, sizeof(req), NULL, 0);
 656         if (!ret)
 657                 channel->strobe_state = state;
 658
 659         gb_pm_runtime_put_autosuspend(bundle);
 660
 661         return ret;
 662 }
 663
 664 static int gb_lights_flash_strobe_get(struct led_classdev_flash *fcdev,
 665                                       bool *state)
 666 {
 667         struct gb_channel *channel = container_of(fcdev, struct gb_channel,
 668                                                   fled);
 669
 670         *state = channel->strobe_state;
 671         return 0;
 672 }
 673
 674 static int gb_lights_flash_timeout_set(struct led_classdev_flash *fcdev,
 675                                        u32 timeout)
 676 {
 677         struct gb_channel *channel = container_of(fcdev, struct gb_channel,
 678                                                   fled);
 679         struct gb_connection *connection = get_conn_from_channel(channel);
 680         struct gb_bundle *bundle = connection->bundle;
 681         struct gb_lights_set_flash_timeout_request req;
 682         int ret;
 683
 684         if (channel->releasing)
 685                 return -ESHUTDOWN;
 686
 687         ret = gb_pm_runtime_get_sync(bundle);
 688         if (ret < 0)
 689                 return ret;
 690
 691         req.light_id = channel->light->id;
 692         req.channel_id = channel->id;
 693         req.timeout_us = cpu_to_le32(timeout);
 694
 695         ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_SET_FLASH_TIMEOUT,
 696                                 &req, sizeof(req), NULL, 0);
 697         if (!ret)
 698                 fcdev->timeout.val = timeout;
 699
 700         gb_pm_runtime_put_autosuspend(bundle);
 701
 702         return ret;
 703 }
 704
 705 static int gb_lights_flash_fault_get(struct led_classdev_flash *fcdev,
 706                                      u32 *fault)
 707 {
 708         struct gb_channel *channel = container_of(fcdev, struct gb_channel,
 709                                                   fled);
 710         struct gb_connection *connection = get_conn_from_channel(channel);
 711         struct gb_bundle *bundle = connection->bundle;
 712         struct gb_lights_get_flash_fault_request req;
 713         struct gb_lights_get_flash_fault_response resp;
 714         int ret;
 715
 716         if (channel->releasing)
 717                 return -ESHUTDOWN;
 718
 719         ret = gb_pm_runtime_get_sync(bundle);
 720         if (ret < 0)
 721                 return ret;
 722
 723         req.light_id = channel->light->id;
 724         req.channel_id = channel->id;
 725
 726         ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_GET_FLASH_FAULT,
 727                                 &req, sizeof(req), &resp, sizeof(resp));
 728         if (!ret)
 729                 *fault = le32_to_cpu(resp.fault);
 730
 731         gb_pm_runtime_put_autosuspend(bundle);
 732
 733         return ret;
 734 }
 735
 736 static const struct led_flash_ops gb_lights_flash_ops = {
 737         .flash_brightness_set   = gb_lights_flash_intensity_set,
 738         .flash_brightness_get   = gb_lights_flash_intensity_get,
 739         .strobe_set             = gb_lights_flash_strobe_set,
 740         .strobe_get             = gb_lights_flash_strobe_get,
 741         .timeout_set            = gb_lights_flash_timeout_set,
 742         .fault_get              = gb_lights_flash_fault_get,
 743 };
 744
 745 static int __gb_lights_channel_torch_attach(struct gb_channel *channel,
 746                                             struct gb_channel *channel_torch)
 747 {
 748         char *name;
 749
 750         /* we can only attach torch to a flash channel */
 751         if (!(channel->mode & GB_CHANNEL_MODE_FLASH))
 752                 return 0;
 753
 754         /* Move torch brightness to the destination */
 755         channel->led->max_brightness = channel_torch->led->max_brightness;
 756
 757         /* append mode name to flash name */
 758         name = kasprintf(GFP_KERNEL, "%s_%s", channel->led->name,
 759                          channel_torch->mode_name);
 760         if (!name)
 761                 return -ENOMEM;
 762         kfree(channel->led->name);
 763         channel->led->name = name;
 764
 765         channel_torch->led = channel->led;
 766
 767         return 0;
 768 }
 769
 770 static int __gb_lights_flash_led_register(struct gb_channel *channel)
 771 {
 772         struct gb_connection *connection = get_conn_from_channel(channel);
 773         struct led_classdev_flash *fled = &channel->fled;
 774         struct led_flash_setting *fset;
 775         struct gb_channel *channel_torch;
 776         int ret;
 777
 778         fled->ops = &gb_lights_flash_ops;
 779
 780         fled->led_cdev.flags |= LED_DEV_CAP_FLASH;
 781
 782         fset = &fled->brightness;
 783         fset->min = channel->intensity_uA.min;
 784         fset->max = channel->intensity_uA.max;
 785         fset->step = channel->intensity_uA.step;
 786         fset->val = channel->intensity_uA.max;
 787
 788         /* Only the flash mode have the timeout constraints settings */
 789         if (channel->mode & GB_CHANNEL_MODE_FLASH) {
 790                 fset = &fled->timeout;
 791                 fset->min = channel->timeout_us.min;
 792                 fset->max = channel->timeout_us.max;
 793                 fset->step = channel->timeout_us.step;
 794                 fset->val = channel->timeout_us.max;
 795         }
 796
 797         /*
 798          * If light have torch mode channel, this channel will be the led
 799          * classdev of the registered above flash classdev
 800          */
 801         channel_torch = get_channel_from_mode(channel->light,
 802                                               GB_CHANNEL_MODE_TORCH);
 803         if (channel_torch) {
 804                 ret = __gb_lights_channel_torch_attach(channel, channel_torch);
 805                 if (ret < 0)
 806                         goto fail;
 807         }
 808
 809         ret = led_classdev_flash_register(&connection->bundle->dev, fled);
 810         if (ret < 0)
 811                 goto fail;
 812
 813         channel->is_registered = true;
 814         return 0;
 815 fail:
 816         channel->led = NULL;
 817         return ret;
 818 }
 819
 820 static void __gb_lights_flash_led_unregister(struct gb_channel *channel)
 821 {
 822         if (!channel->is_registered)
 823                 return;
 824
 825         led_classdev_flash_unregister(&channel->fled);
 826 }
 827
 828 static int gb_lights_channel_flash_config(struct gb_channel *channel)
 829 {
 830         struct gb_connection *connection = get_conn_from_channel(channel);
 831         struct gb_lights_get_channel_flash_config_request req;
 832         struct gb_lights_get_channel_flash_config_response conf;
 833         struct led_flash_setting *fset;
 834         int ret;
 835
 836         req.light_id = channel->light->id;
 837         req.channel_id = channel->id;
 838
 839         ret = gb_operation_sync(connection,
 840                                 GB_LIGHTS_TYPE_GET_CHANNEL_FLASH_CONFIG,
 841                                 &req, sizeof(req), &conf, sizeof(conf));
 842         if (ret < 0)
 843                 return ret;
 844
 845         /*
 846          * Intensity constraints for flash related modes: flash, torch,
 847          * indicator.  They will be needed for v4l2 registration.
 848          */
 849         fset = &channel->intensity_uA;
 850         fset->min = le32_to_cpu(conf.intensity_min_uA);
 851         fset->max = le32_to_cpu(conf.intensity_max_uA);
 852         fset->step = le32_to_cpu(conf.intensity_step_uA);
 853
 854         /*
 855          * On flash type, max brightness is set as the number of intensity steps
 856          * available.
 857          */
 858         channel->led->max_brightness = (fset->max - fset->min) / fset->step;
 859
 860         /* Only the flash mode have the timeout constraints settings */
 861         if (channel->mode & GB_CHANNEL_MODE_FLASH) {
 862                 fset = &channel->timeout_us;
 863                 fset->min = le32_to_cpu(conf.timeout_min_us);
 864                 fset->max = le32_to_cpu(conf.timeout_max_us);
 865                 fset->step = le32_to_cpu(conf.timeout_step_us);
 866         }
 867
 868         return 0;
 869 }
 870 #else
 871 static int gb_lights_channel_flash_config(struct gb_channel *channel)
 872 {
 873         struct gb_connection *connection = get_conn_from_channel(channel);
 874
 875         dev_err(&connection->bundle->dev, "no support for flash devices\n");
 876         return 0;
 877 }
 878
 879 static int __gb_lights_flash_led_register(struct gb_channel *channel)
 880 {
 881         return 0;
 882 }
 883
 884 static void __gb_lights_flash_led_unregister(struct gb_channel *channel)
 885 {
 886 }
 887
 888 #endif
 889
 890 static int __gb_lights_led_register(struct gb_channel *channel)
 891 {
 892         struct gb_connection *connection = get_conn_from_channel(channel);
 893         struct led_classdev *cdev = get_channel_cdev(channel);
 894         int ret;
 895
 896         ret = led_classdev_register(&connection->bundle->dev, cdev);
 897         if (ret < 0)
 898                 channel->led = NULL;
 899         else
 900                 channel->is_registered = true;
 901         return ret;
 902 }
 903
 904 static int gb_lights_channel_register(struct gb_channel *channel)
 905 {
 906         /* Normal LED channel, just register in led classdev and we are done */
 907         if (!is_channel_flash(channel))
 908                 return __gb_lights_led_register(channel);
 909
 910         /*
 911          * Flash Type need more work, register flash classdev, indicator as
 912          * flash classdev, torch will be led classdev of the flash classdev.
 913          */
 914         if (!(channel->mode & GB_CHANNEL_MODE_TORCH))
 915                 return __gb_lights_flash_led_register(channel);
 916
 917         return 0;
 918 }
 919
 920 static void __gb_lights_led_unregister(struct gb_channel *channel)
 921 {
 922         struct led_classdev *cdev = get_channel_cdev(channel);
 923
 924         if (!channel->is_registered)
 925                 return;
 926
 927         led_classdev_unregister(cdev);
 928         kfree(cdev->name);
 929         cdev->name = NULL;
 930         channel->led = NULL;
 931 }
 932
 933 static void gb_lights_channel_unregister(struct gb_channel *channel)
 934 {
 935         /* The same as register, handle channels differently */
 936         if (!is_channel_flash(channel)) {
 937                 __gb_lights_led_unregister(channel);
 938                 return;
 939         }
 940
 941         if (channel->mode & GB_CHANNEL_MODE_TORCH)
 942                 __gb_lights_led_unregister(channel);
 943         else
 944                 __gb_lights_flash_led_unregister(channel);
 945 }
 946
 947 static int gb_lights_channel_config(struct gb_light *light,
 948                                     struct gb_channel *channel)
 949 {
 950         struct gb_lights_get_channel_config_response conf;
 951         struct gb_lights_get_channel_config_request req;
 952         struct gb_connection *connection = get_conn_from_light(light);
 953         struct led_classdev *cdev = get_channel_cdev(channel);
 954         char *name;
 955         int ret;
 956
 957         req.light_id = light->id;
 958         req.channel_id = channel->id;
 959
 960         ret = gb_operation_sync(connection, GB_LIGHTS_TYPE_GET_CHANNEL_CONFIG,
 961                                 &req, sizeof(req), &conf, sizeof(conf));
 962         if (ret < 0)
 963                 return ret;
 964
 965         channel->light = light;
 966         channel->mode = le32_to_cpu(conf.mode);
 967         channel->flags = le32_to_cpu(conf.flags);
 968         channel->color = le32_to_cpu(conf.color);
 969         channel->color_name = kstrndup(conf.color_name, NAMES_MAX, GFP_KERNEL);
 970         if (!channel->color_name)
 971                 return -ENOMEM;
 972         channel->mode_name = kstrndup(conf.mode_name, NAMES_MAX, GFP_KERNEL);
 973         if (!channel->mode_name)
 974                 return -ENOMEM;
 975
 976         channel->led = cdev;
 977
 978         name = kasprintf(GFP_KERNEL, "%s:%s:%s", light->name,
 979                          channel->color_name, channel->mode_name);
 980         if (!name)
 981                 return -ENOMEM;
 982
 983         cdev->name = name;
 984
 985         cdev->max_brightness = conf.max_brightness;
 986
 987         ret = channel_attr_groups_set(channel, cdev);
 988         if (ret < 0)
 989                 return ret;
 990
 991         gb_lights_led_operations_set(channel, cdev);
 992
 993         /*
 994          * If it is not a flash related channel (flash, torch or indicator) we
 995          * are done here. If not, continue and fetch flash related
 996          * configurations.
 997          */
 998         if (!is_channel_flash(channel))
 999                 return ret;
1000
1001         light->has_flash = true;
1002
1003         ret = gb_lights_channel_flash_config(channel);
1004         if (ret < 0)
1005                 return ret;
1006
1007         return ret;
1008 }
1009
1010 static int gb_lights_light_config(struct gb_lights *glights, u8 id)
1011 {
1012         struct gb_light *light = &glights->lights[id];
1013         struct gb_lights_get_light_config_request req;
1014         struct gb_lights_get_light_config_response conf;
1015         int ret;
1016         int i;
1017
1018         light->glights = glights;
1019         light->id = id;
1020
1021         req.id = id;
1022
1023         ret = gb_operation_sync(glights->connection,
1024                                 GB_LIGHTS_TYPE_GET_LIGHT_CONFIG,
1025                                 &req, sizeof(req), &conf, sizeof(conf));
1026         if (ret < 0)
1027                 return ret;
1028
1029         if (!conf.channel_count)
1030                 return -EINVAL;
1031         if (!strlen(conf.name))
1032                 return -EINVAL;
1033
1034         light->channels_count = conf.channel_count;
1035         light->name = kstrndup(conf.name, NAMES_MAX, GFP_KERNEL);
1036         if (!light->name)
1037                 return -ENOMEM;
1038         light->channels = kcalloc(light->channels_count,
1039                                   sizeof(struct gb_channel), GFP_KERNEL);
1040         if (!light->channels)
1041                 return -ENOMEM;
1042
1043         /* First we collect all the configurations for all channels */
1044         for (i = 0; i < light->channels_count; i++) {
1045                 light->channels[i].id = i;
1046                 ret = gb_lights_channel_config(light, &light->channels[i]);
1047                 if (ret < 0)
1048                         return ret;
1049         }
1050
1051         return 0;
1052 }
1053
1054 static int gb_lights_light_register(struct gb_light *light)
1055 {
1056         int ret;
1057         int i;
1058
1059         /*
1060          * Then, if everything went ok in getting configurations, we register
1061          * the classdev, flash classdev and v4l2 subsystem, if a flash device is
1062          * found.
1063          */
1064         for (i = 0; i < light->channels_count; i++) {
1065                 ret = gb_lights_channel_register(&light->channels[i]);
1066                 if (ret < 0)
1067                         return ret;
1068
1069                 mutex_init(&light->channels[i].lock);
1070         }
1071
1072         light->ready = true;
1073
1074         if (light->has_flash) {
1075                 ret = gb_lights_light_v4l2_register(light);
1076                 if (ret < 0) {
1077                         light->has_flash = false;
1078                         return ret;
1079                 }
1080         }
1081
1082         return 0;
1083 }
1084
1085 static void gb_lights_channel_free(struct gb_channel *channel)
1086 {
1087         kfree(channel->attrs);
1088         kfree(channel->attr_group);
1089         kfree(channel->attr_groups);
1090         kfree(channel->color_name);
1091         kfree(channel->mode_name);
1092         mutex_destroy(&channel->lock);
1093 }
1094
1095 static void gb_lights_channel_release(struct gb_channel *channel)
1096 {
1097         channel->releasing = true;
1098
1099         gb_lights_channel_unregister(channel);
1100
1101         gb_lights_channel_free(channel);
1102 }
1103
1104 static void gb_lights_light_release(struct gb_light *light)
1105 {
1106         int i;
1107
1108         light->ready = false;
1109
1110         if (light->has_flash)
1111                 gb_lights_light_v4l2_unregister(light);
1112         light->has_flash = false;
1113
1114         for (i = 0; i < light->channels_count; i++)
1115                 gb_lights_channel_release(&light->channels[i]);
1116         light->channels_count = 0;
1117
1118         kfree(light->channels);
1119         light->channels = NULL;
1120         kfree(light->name);
1121         light->name = NULL;
1122 }
1123
1124 static void gb_lights_release(struct gb_lights *glights)
1125 {
1126         int i;
1127
1128         if (!glights)
1129                 return;
1130
1131         mutex_lock(&glights->lights_lock);
1132         if (!glights->lights)
1133                 goto free_glights;
1134
1135         for (i = 0; i < glights->lights_count; i++)
1136                 gb_lights_light_release(&glights->lights[i]);
1137
1138         kfree(glights->lights);
1139
1140 free_glights:
1141         mutex_unlock(&glights->lights_lock);
1142         mutex_destroy(&glights->lights_lock);
1143         kfree(glights);
1144 }
1145
1146 static int gb_lights_get_count(struct gb_lights *glights)
1147 {
1148         struct gb_lights_get_lights_response resp;
1149         int ret;
1150
1151         ret = gb_operation_sync(glights->connection, GB_LIGHTS_TYPE_GET_LIGHTS,
1152                                 NULL, 0, &resp, sizeof(resp));
1153         if (ret < 0)
1154                 return ret;
1155
1156         if (!resp.lights_count)
1157                 return -EINVAL;
1158
1159         glights->lights_count = resp.lights_count;
1160
1161         return 0;
1162 }
1163
1164 static int gb_lights_create_all(struct gb_lights *glights)
1165 {
1166         struct gb_connection *connection = glights->connection;
1167         int ret;
1168         int i;
1169
1170         mutex_lock(&glights->lights_lock);
1171         ret = gb_lights_get_count(glights);
1172         if (ret < 0)
1173                 goto out;
1174
1175         glights->lights = kcalloc(glights->lights_count,
1176                                   sizeof(struct gb_light), GFP_KERNEL);
1177         if (!glights->lights) {
1178                 ret = -ENOMEM;
1179                 goto out;
1180         }
1181
1182         for (i = 0; i < glights->lights_count; i++) {
1183                 ret = gb_lights_light_config(glights, i);
1184                 if (ret < 0) {
1185                         dev_err(&connection->bundle->dev,
1186                                 "Fail to configure lights device\n");
1187                         goto out;
1188                 }
1189         }
1190
1191 out:
1192         mutex_unlock(&glights->lights_lock);
1193         return ret;
1194 }
1195
1196 static int gb_lights_register_all(struct gb_lights *glights)
1197 {
1198         struct gb_connection *connection = glights->connection;
1199         int ret = 0;
1200         int i;
1201
1202         mutex_lock(&glights->lights_lock);
1203         for (i = 0; i < glights->lights_count; i++) {
1204                 ret = gb_lights_light_register(&glights->lights[i]);
1205                 if (ret < 0) {
1206                         dev_err(&connection->bundle->dev,
1207                                 "Fail to enable lights device\n");
1208                         break;
1209                 }
1210         }
1211
1212         mutex_unlock(&glights->lights_lock);
1213         return ret;
1214 }
1215
1216 static int gb_lights_request_handler(struct gb_operation *op)
1217 {
1218         struct gb_connection *connection = op->connection;
1219         struct device *dev = &connection->bundle->dev;
1220         struct gb_lights *glights = gb_connection_get_data(connection);
1221         struct gb_light *light;
1222         struct gb_message *request;
1223         struct gb_lights_event_request *payload;
1224         int ret =  0;
1225         u8 light_id;
1226         u8 event;
1227
1228         if (op->type != GB_LIGHTS_TYPE_EVENT) {
1229                 dev_err(dev, "Unsupported unsolicited event: %u\n", op->type);
1230                 return -EINVAL;
1231         }
1232
1233         request = op->request;
1234
1235         if (request->payload_size < sizeof(*payload)) {
1236                 dev_err(dev, "Wrong event size received (%zu < %zu)\n",
1237                         request->payload_size, sizeof(*payload));
1238                 return -EINVAL;
1239         }
1240
1241         payload = request->payload;
1242         light_id = payload->light_id;
1243
1244         if (light_id >= glights->lights_count ||
1245             !glights->lights[light_id].ready) {
1246                 dev_err(dev, "Event received for unconfigured light id: %d\n",
1247                         light_id);
1248                 return -EINVAL;
1249         }
1250
1251         event = payload->event;
1252
1253         if (event & GB_LIGHTS_LIGHT_CONFIG) {
1254                 light = &glights->lights[light_id];
1255
1256                 mutex_lock(&glights->lights_lock);
1257                 gb_lights_light_release(light);
1258                 ret = gb_lights_light_config(glights, light_id);
1259                 if (!ret)
1260                         ret = gb_lights_light_register(light);
1261                 if (ret < 0)
1262                         gb_lights_light_release(light);
1263                 mutex_unlock(&glights->lights_lock);
1264         }
1265
1266         return ret;
1267 }
1268
1269 static int gb_lights_probe(struct gb_bundle *bundle,
1270                            const struct greybus_bundle_id *id)
1271 {
1272         struct greybus_descriptor_cport *cport_desc;
1273         struct gb_connection *connection;
1274         struct gb_lights *glights;
1275         int ret;
1276
1277         if (bundle->num_cports != 1)
1278                 return -ENODEV;
1279
1280         cport_desc = &bundle->cport_desc[0];
1281         if (cport_desc->protocol_id != GREYBUS_PROTOCOL_LIGHTS)
1282                 return -ENODEV;
1283
1284         glights = kzalloc(sizeof(*glights), GFP_KERNEL);
1285         if (!glights)
1286                 return -ENOMEM;
1287
1288         mutex_init(&glights->lights_lock);
1289
1290         connection = gb_connection_create(bundle, le16_to_cpu(cport_desc->id),
1291                                           gb_lights_request_handler);
1292         if (IS_ERR(connection)) {
1293                 ret = PTR_ERR(connection);
1294                 goto out;
1295         }
1296
1297         glights->connection = connection;
1298         gb_connection_set_data(connection, glights);
1299
1300         greybus_set_drvdata(bundle, glights);
1301
1302         /* We aren't ready to receive an incoming request yet */
1303         ret = gb_connection_enable_tx(connection);
1304         if (ret)
1305                 goto error_connection_destroy;
1306
1307         /*
1308          * Setup all the lights devices over this connection, if anything goes
1309          * wrong tear down all lights
1310          */
1311         ret = gb_lights_create_all(glights);
1312         if (ret < 0)
1313                 goto error_connection_disable;
1314
1315         /* We are ready to receive an incoming request now, enable RX as well */
1316         ret = gb_connection_enable(connection);
1317         if (ret)
1318                 goto error_connection_disable;
1319
1320         /* Enable & register lights */
1321         ret = gb_lights_register_all(glights);
1322         if (ret < 0)
1323                 goto error_connection_disable;
1324
1325         gb_pm_runtime_put_autosuspend(bundle);
1326
1327         return 0;
1328
1329 error_connection_disable:
1330         gb_connection_disable(connection);
1331 error_connection_destroy:
1332         gb_connection_destroy(connection);
1333 out:
1334         gb_lights_release(glights);
1335         return ret;
1336 }
1337
1338 static void gb_lights_disconnect(struct gb_bundle *bundle)
1339 {
1340         struct gb_lights *glights = greybus_get_drvdata(bundle);
1341
1342         if (gb_pm_runtime_get_sync(bundle))
1343                 gb_pm_runtime_get_noresume(bundle);
1344
1345         gb_connection_disable(glights->connection);
1346         gb_connection_destroy(glights->connection);
1347
1348         gb_lights_release(glights);
1349 }
1350
1351 static const struct greybus_bundle_id gb_lights_id_table[] = {
1352         { GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_LIGHTS) },
1353         { }
1354 };
1355 MODULE_DEVICE_TABLE(greybus, gb_lights_id_table);
1356
1357 static struct greybus_driver gb_lights_driver = {
1358         .name           = "lights",
1359         .probe          = gb_lights_probe,
1360         .disconnect     = gb_lights_disconnect,
1361         .id_table       = gb_lights_id_table,
1362 };
1363 module_greybus_driver(gb_lights_driver);
1364
1365 MODULE_LICENSE("GPL v2");