drivers/i3c/master.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2018 Cadence Design Systems Inc.
   4  *
   5  * Author: Boris Brezillon <boris.brezillon@bootlin.com>
   6  */
   7
   8 #include <linux/atomic.h>
   9 #include <linux/bug.h>
  10 #include <linux/device.h>
  11 #include <linux/err.h>
  12 #include <linux/export.h>
  13 #include <linux/kernel.h>
  14 #include <linux/list.h>
  15 #include <linux/of.h>
  16 #include <linux/slab.h>
  17 #include <linux/spinlock.h>
  18 #include <linux/workqueue.h>
  19
  20 #include "internals.h"
  21
  22 static DEFINE_IDR(i3c_bus_idr);
  23 static DEFINE_MUTEX(i3c_core_lock);
  24
  25 /**
  26  * i3c_bus_maintenance_lock - Lock the bus for a maintenance operation
  27  * @bus: I3C bus to take the lock on
  28  *
  29  * This function takes the bus lock so that no other operations can occur on
  30  * the bus. This is needed for all kind of bus maintenance operation, like
  31  * - enabling/disabling slave events
  32  * - re-triggering DAA
  33  * - changing the dynamic address of a device
  34  * - relinquishing mastership
  35  * - ...
  36  *
  37  * The reason for this kind of locking is that we don't want drivers and core
  38  * logic to rely on I3C device information that could be changed behind their
  39  * back.
  40  */
  41 static void i3c_bus_maintenance_lock(struct i3c_bus *bus)
  42 {
  43         down_write(&bus->lock);
  44 }
  45
  46 /**
  47  * i3c_bus_maintenance_unlock - Release the bus lock after a maintenance
  48  *                            operation
  49  * @bus: I3C bus to release the lock on
  50  *
  51  * Should be called when the bus maintenance operation is done. See
  52  * i3c_bus_maintenance_lock() for more details on what these maintenance
  53  * operations are.
  54  */
  55 static void i3c_bus_maintenance_unlock(struct i3c_bus *bus)
  56 {
  57         up_write(&bus->lock);
  58 }
  59
  60 /**
  61  * i3c_bus_normaluse_lock - Lock the bus for a normal operation
  62  * @bus: I3C bus to take the lock on
  63  *
  64  * This function takes the bus lock for any operation that is not a maintenance
  65  * operation (see i3c_bus_maintenance_lock() for a non-exhaustive list of
  66  * maintenance operations). Basically all communications with I3C devices are
  67  * normal operations (HDR, SDR transfers or CCC commands that do not change bus
  68  * state or I3C dynamic address).
  69  *
  70  * Note that this lock is not guaranteeing serialization of normal operations.
  71  * In other words, transfer requests passed to the I3C master can be submitted
  72  * in parallel and I3C master drivers have to use their own locking to make
  73  * sure two different communications are not inter-mixed, or access to the
  74  * output/input queue is not done while the engine is busy.
  75  */
  76 void i3c_bus_normaluse_lock(struct i3c_bus *bus)
  77 {
  78         down_read(&bus->lock);
  79 }
  80
  81 /**
  82  * i3c_bus_normaluse_unlock - Release the bus lock after a normal operation
  83  * @bus: I3C bus to release the lock on
  84  *
  85  * Should be called when a normal operation is done. See
  86  * i3c_bus_normaluse_lock() for more details on what these normal operations
  87  * are.
  88  */
  89 void i3c_bus_normaluse_unlock(struct i3c_bus *bus)
  90 {
  91         up_read(&bus->lock);
  92 }
  93
  94 static struct i3c_master_controller *
  95 i3c_bus_to_i3c_master(struct i3c_bus *i3cbus)
  96 {
  97         return container_of(i3cbus, struct i3c_master_controller, bus);
  98 }
  99
 100 static struct i3c_master_controller *dev_to_i3cmaster(struct device *dev)
 101 {
 102         return container_of(dev, struct i3c_master_controller, dev);
 103 }
 104
 105 static const struct device_type i3c_device_type;
 106
 107 static struct i3c_bus *dev_to_i3cbus(struct device *dev)
 108 {
 109         struct i3c_master_controller *master;
 110
 111         if (dev->type == &i3c_device_type)
 112                 return dev_to_i3cdev(dev)->bus;
 113
 114         master = dev_to_i3cmaster(dev);
 115
 116         return &master->bus;
 117 }
 118
 119 static struct i3c_dev_desc *dev_to_i3cdesc(struct device *dev)
 120 {
 121         struct i3c_master_controller *master;
 122
 123         if (dev->type == &i3c_device_type)
 124                 return dev_to_i3cdev(dev)->desc;
 125
 126         master = dev_to_i3cmaster(dev);
 127
 128         return master->this;
 129 }
 130
 131 static ssize_t bcr_show(struct device *dev,
 132                         struct device_attribute *da,
 133                         char *buf)
 134 {
 135         struct i3c_bus *bus = dev_to_i3cbus(dev);
 136         struct i3c_dev_desc *desc;
 137         ssize_t ret;
 138
 139         i3c_bus_normaluse_lock(bus);
 140         desc = dev_to_i3cdesc(dev);
 141         ret = sprintf(buf, "%x\n", desc->info.bcr);
 142         i3c_bus_normaluse_unlock(bus);
 143
 144         return ret;
 145 }
 146 static DEVICE_ATTR_RO(bcr);
 147
 148 static ssize_t dcr_show(struct device *dev,
 149                         struct device_attribute *da,
 150                         char *buf)
 151 {
 152         struct i3c_bus *bus = dev_to_i3cbus(dev);
 153         struct i3c_dev_desc *desc;
 154         ssize_t ret;
 155
 156         i3c_bus_normaluse_lock(bus);
 157         desc = dev_to_i3cdesc(dev);
 158         ret = sprintf(buf, "%x\n", desc->info.dcr);
 159         i3c_bus_normaluse_unlock(bus);
 160
 161         return ret;
 162 }
 163 static DEVICE_ATTR_RO(dcr);
 164
 165 static ssize_t pid_show(struct device *dev,
 166                         struct device_attribute *da,
 167                         char *buf)
 168 {
 169         struct i3c_bus *bus = dev_to_i3cbus(dev);
 170         struct i3c_dev_desc *desc;
 171         ssize_t ret;
 172
 173         i3c_bus_normaluse_lock(bus);
 174         desc = dev_to_i3cdesc(dev);
 175         ret = sprintf(buf, "%llx\n", desc->info.pid);
 176         i3c_bus_normaluse_unlock(bus);
 177
 178         return ret;
 179 }
 180 static DEVICE_ATTR_RO(pid);
 181
 182 static ssize_t dynamic_address_show(struct device *dev,
 183                                     struct device_attribute *da,
 184                                     char *buf)
 185 {
 186         struct i3c_bus *bus = dev_to_i3cbus(dev);
 187         struct i3c_dev_desc *desc;
 188         ssize_t ret;
 189
 190         i3c_bus_normaluse_lock(bus);
 191         desc = dev_to_i3cdesc(dev);
 192         ret = sprintf(buf, "%02x\n", desc->info.dyn_addr);
 193         i3c_bus_normaluse_unlock(bus);
 194
 195         return ret;
 196 }
 197 static DEVICE_ATTR_RO(dynamic_address);
 198
 199 static const char * const hdrcap_strings[] = {
 200         "hdr-ddr", "hdr-tsp", "hdr-tsl",
 201 };
 202
 203 static ssize_t hdrcap_show(struct device *dev,
 204                            struct device_attribute *da,
 205                            char *buf)
 206 {
 207         struct i3c_bus *bus = dev_to_i3cbus(dev);
 208         struct i3c_dev_desc *desc;
 209         ssize_t offset = 0, ret;
 210         unsigned long caps;
 211         int mode;
 212
 213         i3c_bus_normaluse_lock(bus);
 214         desc = dev_to_i3cdesc(dev);
 215         caps = desc->info.hdr_cap;
 216         for_each_set_bit(mode, &caps, 8) {
 217                 if (mode >= ARRAY_SIZE(hdrcap_strings))
 218                         break;
 219
 220                 if (!hdrcap_strings[mode])
 221                         continue;
 222
 223                 ret = sprintf(buf + offset, offset ? " %s" : "%s",
 224                               hdrcap_strings[mode]);
 225                 if (ret < 0)
 226                         goto out;
 227
 228                 offset += ret;
 229         }
 230
 231         ret = sprintf(buf + offset, "\n");
 232         if (ret < 0)
 233                 goto out;
 234
 235         ret = offset + ret;
 236
 237 out:
 238         i3c_bus_normaluse_unlock(bus);
 239
 240         return ret;
 241 }
 242 static DEVICE_ATTR_RO(hdrcap);
 243
 244 static ssize_t modalias_show(struct device *dev,
 245                              struct device_attribute *da, char *buf)
 246 {
 247         struct i3c_device *i3c = dev_to_i3cdev(dev);
 248         struct i3c_device_info devinfo;
 249         u16 manuf, part, ext;
 250
 251         i3c_device_get_info(i3c, &devinfo);
 252         manuf = I3C_PID_MANUF_ID(devinfo.pid);
 253         part = I3C_PID_PART_ID(devinfo.pid);
 254         ext = I3C_PID_EXTRA_INFO(devinfo.pid);
 255
 256         if (I3C_PID_RND_LOWER_32BITS(devinfo.pid))
 257                 return sprintf(buf, "i3c:dcr%02Xmanuf%04X", devinfo.dcr,
 258                                manuf);
 259
 260         return sprintf(buf, "i3c:dcr%02Xmanuf%04Xpart%04Xext%04X",
 261                        devinfo.dcr, manuf, part, ext);
 262 }
 263 static DEVICE_ATTR_RO(modalias);
 264
 265 static struct attribute *i3c_device_attrs[] = {
 266         &dev_attr_bcr.attr,
 267         &dev_attr_dcr.attr,
 268         &dev_attr_pid.attr,
 269         &dev_attr_dynamic_address.attr,
 270         &dev_attr_hdrcap.attr,
 271         &dev_attr_modalias.attr,
 272         NULL,
 273 };
 274 ATTRIBUTE_GROUPS(i3c_device);
 275
 276 static int i3c_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 277 {
 278         struct i3c_device *i3cdev = dev_to_i3cdev(dev);
 279         struct i3c_device_info devinfo;
 280         u16 manuf, part, ext;
 281
 282         i3c_device_get_info(i3cdev, &devinfo);
 283         manuf = I3C_PID_MANUF_ID(devinfo.pid);
 284         part = I3C_PID_PART_ID(devinfo.pid);
 285         ext = I3C_PID_EXTRA_INFO(devinfo.pid);
 286
 287         if (I3C_PID_RND_LOWER_32BITS(devinfo.pid))
 288                 return add_uevent_var(env, "MODALIAS=i3c:dcr%02Xmanuf%04X",
 289                                       devinfo.dcr, manuf);
 290
 291         return add_uevent_var(env,
 292                               "MODALIAS=i3c:dcr%02Xmanuf%04Xpart%04Xext%04X",
 293                               devinfo.dcr, manuf, part, ext);
 294 }
 295
 296 static const struct device_type i3c_device_type = {
 297         .groups = i3c_device_groups,
 298         .uevent = i3c_device_uevent,
 299 };
 300
 301 static int i3c_device_match(struct device *dev, struct device_driver *drv)
 302 {
 303         struct i3c_device *i3cdev;
 304         struct i3c_driver *i3cdrv;
 305
 306         if (dev->type != &i3c_device_type)
 307                 return 0;
 308
 309         i3cdev = dev_to_i3cdev(dev);
 310         i3cdrv = drv_to_i3cdrv(drv);
 311         if (i3c_device_match_id(i3cdev, i3cdrv->id_table))
 312                 return 1;
 313
 314         return 0;
 315 }
 316
 317 static int i3c_device_probe(struct device *dev)
 318 {
 319         struct i3c_device *i3cdev = dev_to_i3cdev(dev);
 320         struct i3c_driver *driver = drv_to_i3cdrv(dev->driver);
 321
 322         return driver->probe(i3cdev);
 323 }
 324
 325 static int i3c_device_remove(struct device *dev)
 326 {
 327         struct i3c_device *i3cdev = dev_to_i3cdev(dev);
 328         struct i3c_driver *driver = drv_to_i3cdrv(dev->driver);
 329         int ret;
 330
 331         ret = driver->remove(i3cdev);
 332         if (ret)
 333                 return ret;
 334
 335         i3c_device_free_ibi(i3cdev);
 336
 337         return ret;
 338 }
 339
 340 struct bus_type i3c_bus_type = {
 341         .name = "i3c",
 342         .match = i3c_device_match,
 343         .probe = i3c_device_probe,
 344         .remove = i3c_device_remove,
 345 };
 346
 347 static enum i3c_addr_slot_status
 348 i3c_bus_get_addr_slot_status(struct i3c_bus *bus, u16 addr)
 349 {
 350         int status, bitpos = addr * 2;
 351
 352         if (addr > I2C_MAX_ADDR)
 353                 return I3C_ADDR_SLOT_RSVD;
 354
 355         status = bus->addrslots[bitpos / BITS_PER_LONG];
 356         status >>= bitpos % BITS_PER_LONG;
 357
 358         return status & I3C_ADDR_SLOT_STATUS_MASK;
 359 }
 360
 361 static void i3c_bus_set_addr_slot_status(struct i3c_bus *bus, u16 addr,
 362                                          enum i3c_addr_slot_status status)
 363 {
 364         int bitpos = addr * 2;
 365         unsigned long *ptr;
 366
 367         if (addr > I2C_MAX_ADDR)
 368                 return;
 369
 370         ptr = bus->addrslots + (bitpos / BITS_PER_LONG);
 371         *ptr &= ~((unsigned long)I3C_ADDR_SLOT_STATUS_MASK <<
 372                                                 (bitpos % BITS_PER_LONG));
 373         *ptr |= (unsigned long)status << (bitpos % BITS_PER_LONG);
 374 }
 375
 376 static bool i3c_bus_dev_addr_is_avail(struct i3c_bus *bus, u8 addr)
 377 {
 378         enum i3c_addr_slot_status status;
 379
 380         status = i3c_bus_get_addr_slot_status(bus, addr);
 381
 382         return status == I3C_ADDR_SLOT_FREE;
 383 }
 384
 385 static int i3c_bus_get_free_addr(struct i3c_bus *bus, u8 start_addr)
 386 {
 387         enum i3c_addr_slot_status status;
 388         u8 addr;
 389
 390         for (addr = start_addr; addr < I3C_MAX_ADDR; addr++) {
 391                 status = i3c_bus_get_addr_slot_status(bus, addr);
 392                 if (status == I3C_ADDR_SLOT_FREE)
 393                         return addr;
 394         }
 395
 396         return -ENOMEM;
 397 }
 398
 399 static void i3c_bus_init_addrslots(struct i3c_bus *bus)
 400 {
 401         int i;
 402
 403         /* Addresses 0 to 7 are reserved. */
 404         for (i = 0; i < 8; i++)
 405                 i3c_bus_set_addr_slot_status(bus, i, I3C_ADDR_SLOT_RSVD);
 406
 407         /*
 408          * Reserve broadcast address and all addresses that might collide
 409          * with the broadcast address when facing a single bit error.
 410          */
 411         i3c_bus_set_addr_slot_status(bus, I3C_BROADCAST_ADDR,
 412                                      I3C_ADDR_SLOT_RSVD);
 413         for (i = 0; i < 7; i++)
 414                 i3c_bus_set_addr_slot_status(bus, I3C_BROADCAST_ADDR ^ BIT(i),
 415                                              I3C_ADDR_SLOT_RSVD);
 416 }
 417
 418 static void i3c_bus_cleanup(struct i3c_bus *i3cbus)
 419 {
 420         mutex_lock(&i3c_core_lock);
 421         idr_remove(&i3c_bus_idr, i3cbus->id);
 422         mutex_unlock(&i3c_core_lock);
 423 }
 424
 425 static int i3c_bus_init(struct i3c_bus *i3cbus)
 426 {
 427         int ret;
 428
 429         init_rwsem(&i3cbus->lock);
 430         INIT_LIST_HEAD(&i3cbus->devs.i2c);
 431         INIT_LIST_HEAD(&i3cbus->devs.i3c);
 432         i3c_bus_init_addrslots(i3cbus);
 433         i3cbus->mode = I3C_BUS_MODE_PURE;
 434
 435         mutex_lock(&i3c_core_lock);
 436         ret = idr_alloc(&i3c_bus_idr, i3cbus, 0, 0, GFP_KERNEL);
 437         mutex_unlock(&i3c_core_lock);
 438
 439         if (ret < 0)
 440                 return ret;
 441
 442         i3cbus->id = ret;
 443
 444         return 0;
 445 }
 446
 447 static const char * const i3c_bus_mode_strings[] = {
 448         [I3C_BUS_MODE_PURE] = "pure",
 449         [I3C_BUS_MODE_MIXED_FAST] = "mixed-fast",
 450         [I3C_BUS_MODE_MIXED_LIMITED] = "mixed-limited",
 451         [I3C_BUS_MODE_MIXED_SLOW] = "mixed-slow",
 452 };
 453
 454 static ssize_t mode_show(struct device *dev,
 455                          struct device_attribute *da,
 456                          char *buf)
 457 {
 458         struct i3c_bus *i3cbus = dev_to_i3cbus(dev);
 459         ssize_t ret;
 460
 461         i3c_bus_normaluse_lock(i3cbus);
 462         if (i3cbus->mode < 0 ||
 463             i3cbus->mode >= ARRAY_SIZE(i3c_bus_mode_strings) ||
 464             !i3c_bus_mode_strings[i3cbus->mode])
 465                 ret = sprintf(buf, "unknown\n");
 466         else
 467                 ret = sprintf(buf, "%s\n", i3c_bus_mode_strings[i3cbus->mode]);
 468         i3c_bus_normaluse_unlock(i3cbus);
 469
 470         return ret;
 471 }
 472 static DEVICE_ATTR_RO(mode);
 473
 474 static ssize_t current_master_show(struct device *dev,
 475                                    struct device_attribute *da,
 476                                    char *buf)
 477 {
 478         struct i3c_bus *i3cbus = dev_to_i3cbus(dev);
 479         ssize_t ret;
 480
 481         i3c_bus_normaluse_lock(i3cbus);
 482         ret = sprintf(buf, "%d-%llx\n", i3cbus->id,
 483                       i3cbus->cur_master->info.pid);
 484         i3c_bus_normaluse_unlock(i3cbus);
 485
 486         return ret;
 487 }
 488 static DEVICE_ATTR_RO(current_master);
 489
 490 static ssize_t i3c_scl_frequency_show(struct device *dev,
 491                                       struct device_attribute *da,
 492                                       char *buf)
 493 {
 494         struct i3c_bus *i3cbus = dev_to_i3cbus(dev);
 495         ssize_t ret;
 496
 497         i3c_bus_normaluse_lock(i3cbus);
 498         ret = sprintf(buf, "%ld\n", i3cbus->scl_rate.i3c);
 499         i3c_bus_normaluse_unlock(i3cbus);
 500
 501         return ret;
 502 }
 503 static DEVICE_ATTR_RO(i3c_scl_frequency);
 504
 505 static ssize_t i2c_scl_frequency_show(struct device *dev,
 506                                       struct device_attribute *da,
 507                                       char *buf)
 508 {
 509         struct i3c_bus *i3cbus = dev_to_i3cbus(dev);
 510         ssize_t ret;
 511
 512         i3c_bus_normaluse_lock(i3cbus);
 513         ret = sprintf(buf, "%ld\n", i3cbus->scl_rate.i2c);
 514         i3c_bus_normaluse_unlock(i3cbus);
 515
 516         return ret;
 517 }
 518 static DEVICE_ATTR_RO(i2c_scl_frequency);
 519
 520 static struct attribute *i3c_masterdev_attrs[] = {
 521         &dev_attr_mode.attr,
 522         &dev_attr_current_master.attr,
 523         &dev_attr_i3c_scl_frequency.attr,
 524         &dev_attr_i2c_scl_frequency.attr,
 525         &dev_attr_bcr.attr,
 526         &dev_attr_dcr.attr,
 527         &dev_attr_pid.attr,
 528         &dev_attr_dynamic_address.attr,
 529         &dev_attr_hdrcap.attr,
 530         NULL,
 531 };
 532 ATTRIBUTE_GROUPS(i3c_masterdev);
 533
 534 static void i3c_masterdev_release(struct device *dev)
 535 {
 536         struct i3c_master_controller *master = dev_to_i3cmaster(dev);
 537         struct i3c_bus *bus = dev_to_i3cbus(dev);
 538
 539         if (master->wq)
 540                 destroy_workqueue(master->wq);
 541
 542         WARN_ON(!list_empty(&bus->devs.i2c) || !list_empty(&bus->devs.i3c));
 543         i3c_bus_cleanup(bus);
 544
 545         of_node_put(dev->of_node);
 546 }
 547
 548 static const struct device_type i3c_masterdev_type = {
 549         .groups = i3c_masterdev_groups,
 550 };
 551
 552 static int i3c_bus_set_mode(struct i3c_bus *i3cbus, enum i3c_bus_mode mode,
 553                             unsigned long max_i2c_scl_rate)
 554 {
 555         struct i3c_master_controller *master = i3c_bus_to_i3c_master(i3cbus);
 556
 557         i3cbus->mode = mode;
 558
 559         switch (i3cbus->mode) {
 560         case I3C_BUS_MODE_PURE:
 561                 if (!i3cbus->scl_rate.i3c)
 562                         i3cbus->scl_rate.i3c = I3C_BUS_TYP_I3C_SCL_RATE;
 563                 break;
 564         case I3C_BUS_MODE_MIXED_FAST:
 565         case I3C_BUS_MODE_MIXED_LIMITED:
 566                 if (!i3cbus->scl_rate.i3c)
 567                         i3cbus->scl_rate.i3c = I3C_BUS_TYP_I3C_SCL_RATE;
 568                 if (!i3cbus->scl_rate.i2c)
 569                         i3cbus->scl_rate.i2c = max_i2c_scl_rate;
 570                 break;
 571         case I3C_BUS_MODE_MIXED_SLOW:
 572                 if (!i3cbus->scl_rate.i2c)
 573                         i3cbus->scl_rate.i2c = max_i2c_scl_rate;
 574                 if (!i3cbus->scl_rate.i3c ||
 575                     i3cbus->scl_rate.i3c > i3cbus->scl_rate.i2c)
 576                         i3cbus->scl_rate.i3c = i3cbus->scl_rate.i2c;
 577                 break;
 578         default:
 579                 return -EINVAL;
 580         }
 581
 582         dev_dbg(&master->dev, "i2c-scl = %ld Hz i3c-scl = %ld Hz\n",
 583                 i3cbus->scl_rate.i2c, i3cbus->scl_rate.i3c);
 584
 585         /*
 586          * I3C/I2C frequency may have been overridden, check that user-provided
 587          * values are not exceeding max possible frequency.
 588          */
 589         if (i3cbus->scl_rate.i3c > I3C_BUS_MAX_I3C_SCL_RATE ||
 590             i3cbus->scl_rate.i2c > I3C_BUS_I2C_FM_PLUS_SCL_RATE)
 591                 return -EINVAL;
 592
 593         return 0;
 594 }
 595
 596 static struct i3c_master_controller *
 597 i2c_adapter_to_i3c_master(struct i2c_adapter *adap)
 598 {
 599         return container_of(adap, struct i3c_master_controller, i2c);
 600 }
 601
 602 static struct i2c_adapter *
 603 i3c_master_to_i2c_adapter(struct i3c_master_controller *master)
 604 {
 605         return &master->i2c;
 606 }
 607
 608 static void i3c_master_free_i2c_dev(struct i2c_dev_desc *dev)
 609 {
 610         kfree(dev);
 611 }
 612
 613 static struct i2c_dev_desc *
 614 i3c_master_alloc_i2c_dev(struct i3c_master_controller *master,
 615                          const struct i2c_dev_boardinfo *boardinfo)
 616 {
 617         struct i2c_dev_desc *dev;
 618
 619         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 620         if (!dev)
 621                 return ERR_PTR(-ENOMEM);
 622
 623         dev->common.master = master;
 624         dev->boardinfo = boardinfo;
 625         dev->addr = boardinfo->base.addr;
 626         dev->lvr = boardinfo->lvr;
 627
 628         return dev;
 629 }
 630
 631 static void *i3c_ccc_cmd_dest_init(struct i3c_ccc_cmd_dest *dest, u8 addr,
 632                                    u16 payloadlen)
 633 {
 634         dest->addr = addr;
 635         dest->payload.len = payloadlen;
 636         if (payloadlen)
 637                 dest->payload.data = kzalloc(payloadlen, GFP_KERNEL);
 638         else
 639                 dest->payload.data = NULL;
 640
 641         return dest->payload.data;
 642 }
 643
 644 static void i3c_ccc_cmd_dest_cleanup(struct i3c_ccc_cmd_dest *dest)
 645 {
 646         kfree(dest->payload.data);
 647 }
 648
 649 static void i3c_ccc_cmd_init(struct i3c_ccc_cmd *cmd, bool rnw, u8 id,
 650                              struct i3c_ccc_cmd_dest *dests,
 651                              unsigned int ndests)
 652 {
 653         cmd->rnw = rnw ? 1 : 0;
 654         cmd->id = id;
 655         cmd->dests = dests;
 656         cmd->ndests = ndests;
 657         cmd->err = I3C_ERROR_UNKNOWN;
 658 }
 659
 660 static int i3c_master_send_ccc_cmd_locked(struct i3c_master_controller *master,
 661                                           struct i3c_ccc_cmd *cmd)
 662 {
 663         int ret;
 664
 665         if (!cmd || !master)
 666                 return -EINVAL;
 667
 668         if (WARN_ON(master->init_done &&
 669                     !rwsem_is_locked(&master->bus.lock)))
 670                 return -EINVAL;
 671
 672         if (!master->ops->send_ccc_cmd)
 673                 return -ENOTSUPP;
 674
 675         if ((cmd->id & I3C_CCC_DIRECT) && (!cmd->dests || !cmd->ndests))
 676                 return -EINVAL;
 677
 678         if (master->ops->supports_ccc_cmd &&
 679             !master->ops->supports_ccc_cmd(master, cmd))
 680                 return -ENOTSUPP;
 681
 682         ret = master->ops->send_ccc_cmd(master, cmd);
 683         if (ret) {
 684                 if (cmd->err != I3C_ERROR_UNKNOWN)
 685                         return cmd->err;
 686
 687                 return ret;
 688         }
 689
 690         return 0;
 691 }
 692
 693 static struct i2c_dev_desc *
 694 i3c_master_find_i2c_dev_by_addr(const struct i3c_master_controller *master,
 695                                 u16 addr)
 696 {
 697         struct i2c_dev_desc *dev;
 698
 699         i3c_bus_for_each_i2cdev(&master->bus, dev) {
 700                 if (dev->boardinfo->base.addr == addr)
 701                         return dev;
 702         }
 703
 704         return NULL;
 705 }
 706
 707 /**
 708  * i3c_master_get_free_addr() - get a free address on the bus
 709  * @master: I3C master object
 710  * @start_addr: where to start searching
 711  *
 712  * This function must be called with the bus lock held in write mode.
 713  *
 714  * Return: the first free address starting at @start_addr (included) or -ENOMEM
 715  * if there's no more address available.
 716  */
 717 int i3c_master_get_free_addr(struct i3c_master_controller *master,
 718                              u8 start_addr)
 719 {
 720         return i3c_bus_get_free_addr(&master->bus, start_addr);
 721 }
 722 EXPORT_SYMBOL_GPL(i3c_master_get_free_addr);
 723
 724 static void i3c_device_release(struct device *dev)
 725 {
 726         struct i3c_device *i3cdev = dev_to_i3cdev(dev);
 727
 728         WARN_ON(i3cdev->desc);
 729
 730         of_node_put(i3cdev->dev.of_node);
 731         kfree(i3cdev);
 732 }
 733
 734 static void i3c_master_free_i3c_dev(struct i3c_dev_desc *dev)
 735 {
 736         kfree(dev);
 737 }
 738
 739 static struct i3c_dev_desc *
 740 i3c_master_alloc_i3c_dev(struct i3c_master_controller *master,
 741                          const struct i3c_device_info *info)
 742 {
 743         struct i3c_dev_desc *dev;
 744
 745         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 746         if (!dev)
 747                 return ERR_PTR(-ENOMEM);
 748
 749         dev->common.master = master;
 750         dev->info = *info;
 751         mutex_init(&dev->ibi_lock);
 752
 753         return dev;
 754 }
 755
 756 static int i3c_master_rstdaa_locked(struct i3c_master_controller *master,
 757                                     u8 addr)
 758 {
 759         enum i3c_addr_slot_status addrstat;
 760         struct i3c_ccc_cmd_dest dest;
 761         struct i3c_ccc_cmd cmd;
 762         int ret;
 763
 764         if (!master)
 765                 return -EINVAL;
 766
 767         addrstat = i3c_bus_get_addr_slot_status(&master->bus, addr);
 768         if (addr != I3C_BROADCAST_ADDR && addrstat != I3C_ADDR_SLOT_I3C_DEV)
 769                 return -EINVAL;
 770
 771         i3c_ccc_cmd_dest_init(&dest, addr, 0);
 772         i3c_ccc_cmd_init(&cmd, false,
 773                          I3C_CCC_RSTDAA(addr == I3C_BROADCAST_ADDR),
 774                          &dest, 1);
 775         ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
 776         i3c_ccc_cmd_dest_cleanup(&dest);
 777
 778         return ret;
 779 }
 780
 781 /**
 782  * i3c_master_entdaa_locked() - start a DAA (Dynamic Address Assignment)
 783  *                              procedure
 784  * @master: master used to send frames on the bus
 785  *
 786  * Send a ENTDAA CCC command to start a DAA procedure.
 787  *
 788  * Note that this function only sends the ENTDAA CCC command, all the logic
 789  * behind dynamic address assignment has to be handled in the I3C master
 790  * driver.
 791  *
 792  * This function must be called with the bus lock held in write mode.
 793  *
 794  * Return: 0 in case of success, a positive I3C error code if the error is
 795  * one of the official Mx error codes, and a negative error code otherwise.
 796  */
 797 int i3c_master_entdaa_locked(struct i3c_master_controller *master)
 798 {
 799         struct i3c_ccc_cmd_dest dest;
 800         struct i3c_ccc_cmd cmd;
 801         int ret;
 802
 803         i3c_ccc_cmd_dest_init(&dest, I3C_BROADCAST_ADDR, 0);
 804         i3c_ccc_cmd_init(&cmd, false, I3C_CCC_ENTDAA, &dest, 1);
 805         ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
 806         i3c_ccc_cmd_dest_cleanup(&dest);
 807
 808         return ret;
 809 }
 810 EXPORT_SYMBOL_GPL(i3c_master_entdaa_locked);
 811
 812 static int i3c_master_enec_disec_locked(struct i3c_master_controller *master,
 813                                         u8 addr, bool enable, u8 evts)
 814 {
 815         struct i3c_ccc_events *events;
 816         struct i3c_ccc_cmd_dest dest;
 817         struct i3c_ccc_cmd cmd;
 818         int ret;
 819
 820         events = i3c_ccc_cmd_dest_init(&dest, addr, sizeof(*events));
 821         if (!events)
 822                 return -ENOMEM;
 823
 824         events->events = evts;
 825         i3c_ccc_cmd_init(&cmd, false,
 826                          enable ?
 827                          I3C_CCC_ENEC(addr == I3C_BROADCAST_ADDR) :
 828                          I3C_CCC_DISEC(addr == I3C_BROADCAST_ADDR),
 829                          &dest, 1);
 830         ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
 831         i3c_ccc_cmd_dest_cleanup(&dest);
 832
 833         return ret;
 834 }
 835
 836 /**
 837  * i3c_master_disec_locked() - send a DISEC CCC command
 838  * @master: master used to send frames on the bus
 839  * @addr: a valid I3C slave address or %I3C_BROADCAST_ADDR
 840  * @evts: events to disable
 841  *
 842  * Send a DISEC CCC command to disable some or all events coming from a
 843  * specific slave, or all devices if @addr is %I3C_BROADCAST_ADDR.
 844  *
 845  * This function must be called with the bus lock held in write mode.
 846  *
 847  * Return: 0 in case of success, a positive I3C error code if the error is
 848  * one of the official Mx error codes, and a negative error code otherwise.
 849  */
 850 int i3c_master_disec_locked(struct i3c_master_controller *master, u8 addr,
 851                             u8 evts)
 852 {
 853         return i3c_master_enec_disec_locked(master, addr, false, evts);
 854 }
 855 EXPORT_SYMBOL_GPL(i3c_master_disec_locked);
 856
 857 /**
 858  * i3c_master_enec_locked() - send an ENEC CCC command
 859  * @master: master used to send frames on the bus
 860  * @addr: a valid I3C slave address or %I3C_BROADCAST_ADDR
 861  * @evts: events to disable
 862  *
 863  * Sends an ENEC CCC command to enable some or all events coming from a
 864  * specific slave, or all devices if @addr is %I3C_BROADCAST_ADDR.
 865  *
 866  * This function must be called with the bus lock held in write mode.
 867  *
 868  * Return: 0 in case of success, a positive I3C error code if the error is
 869  * one of the official Mx error codes, and a negative error code otherwise.
 870  */
 871 int i3c_master_enec_locked(struct i3c_master_controller *master, u8 addr,
 872                            u8 evts)
 873 {
 874         return i3c_master_enec_disec_locked(master, addr, true, evts);
 875 }
 876 EXPORT_SYMBOL_GPL(i3c_master_enec_locked);
 877
 878 /**
 879  * i3c_master_defslvs_locked() - send a DEFSLVS CCC command
 880  * @master: master used to send frames on the bus
 881  *
 882  * Send a DEFSLVS CCC command containing all the devices known to the @master.
 883  * This is useful when you have secondary masters on the bus to propagate
 884  * device information.
 885  *
 886  * This should be called after all I3C devices have been discovered (in other
 887  * words, after the DAA procedure has finished) and instantiated in
 888  * &i3c_master_controller_ops->bus_init().
 889  * It should also be called if a master ACKed an Hot-Join request and assigned
 890  * a dynamic address to the device joining the bus.
 891  *
 892  * This function must be called with the bus lock held in write mode.
 893  *
 894  * Return: 0 in case of success, a positive I3C error code if the error is
 895  * one of the official Mx error codes, and a negative error code otherwise.
 896  */
 897 int i3c_master_defslvs_locked(struct i3c_master_controller *master)
 898 {
 899         struct i3c_ccc_defslvs *defslvs;
 900         struct i3c_ccc_dev_desc *desc;
 901         struct i3c_ccc_cmd_dest dest;
 902         struct i3c_dev_desc *i3cdev;
 903         struct i2c_dev_desc *i2cdev;
 904         struct i3c_ccc_cmd cmd;
 905         struct i3c_bus *bus;
 906         bool send = false;
 907         int ndevs = 0, ret;
 908
 909         if (!master)
 910                 return -EINVAL;
 911
 912         bus = i3c_master_get_bus(master);
 913         i3c_bus_for_each_i3cdev(bus, i3cdev) {
 914                 ndevs++;
 915
 916                 if (i3cdev == master->this)
 917                         continue;
 918
 919                 if (I3C_BCR_DEVICE_ROLE(i3cdev->info.bcr) ==
 920                     I3C_BCR_I3C_MASTER)
 921                         send = true;
 922         }
 923
 924         /* No other master on the bus, skip DEFSLVS. */
 925         if (!send)
 926                 return 0;
 927
 928         i3c_bus_for_each_i2cdev(bus, i2cdev)
 929                 ndevs++;
 930
 931         defslvs = i3c_ccc_cmd_dest_init(&dest, I3C_BROADCAST_ADDR,
 932                                         struct_size(defslvs, slaves,
 933                                                     ndevs - 1));
 934         if (!defslvs)
 935                 return -ENOMEM;
 936
 937         defslvs->count = ndevs;
 938         defslvs->master.bcr = master->this->info.bcr;
 939         defslvs->master.dcr = master->this->info.dcr;
 940         defslvs->master.dyn_addr = master->this->info.dyn_addr << 1;
 941         defslvs->master.static_addr = I3C_BROADCAST_ADDR << 1;
 942
 943         desc = defslvs->slaves;
 944         i3c_bus_for_each_i2cdev(bus, i2cdev) {
 945                 desc->lvr = i2cdev->lvr;
 946                 desc->static_addr = i2cdev->addr << 1;
 947                 desc++;
 948         }
 949
 950         i3c_bus_for_each_i3cdev(bus, i3cdev) {
 951                 /* Skip the I3C dev representing this master. */
 952                 if (i3cdev == master->this)
 953                         continue;
 954
 955                 desc->bcr = i3cdev->info.bcr;
 956                 desc->dcr = i3cdev->info.dcr;
 957                 desc->dyn_addr = i3cdev->info.dyn_addr << 1;
 958                 desc->static_addr = i3cdev->info.static_addr << 1;
 959                 desc++;
 960         }
 961
 962         i3c_ccc_cmd_init(&cmd, false, I3C_CCC_DEFSLVS, &dest, 1);
 963         ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
 964         i3c_ccc_cmd_dest_cleanup(&dest);
 965
 966         return ret;
 967 }
 968 EXPORT_SYMBOL_GPL(i3c_master_defslvs_locked);
 969
 970 static int i3c_master_setda_locked(struct i3c_master_controller *master,
 971                                    u8 oldaddr, u8 newaddr, bool setdasa)
 972 {
 973         struct i3c_ccc_cmd_dest dest;
 974         struct i3c_ccc_setda *setda;
 975         struct i3c_ccc_cmd cmd;
 976         int ret;
 977
 978         if (!oldaddr || !newaddr)
 979                 return -EINVAL;
 980
 981         setda = i3c_ccc_cmd_dest_init(&dest, oldaddr, sizeof(*setda));
 982         if (!setda)
 983                 return -ENOMEM;
 984
 985         setda->addr = newaddr << 1;
 986         i3c_ccc_cmd_init(&cmd, false,
 987                          setdasa ? I3C_CCC_SETDASA : I3C_CCC_SETNEWDA,
 988                          &dest, 1);
 989         ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
 990         i3c_ccc_cmd_dest_cleanup(&dest);
 991
 992         return ret;
 993 }
 994
 995 static int i3c_master_setdasa_locked(struct i3c_master_controller *master,
 996                                      u8 static_addr, u8 dyn_addr)
 997 {
 998         return i3c_master_setda_locked(master, static_addr, dyn_addr, true);
 999 }
1000
1001 static int i3c_master_setnewda_locked(struct i3c_master_controller *master,
1002                                       u8 oldaddr, u8 newaddr)
1003 {
1004         return i3c_master_setda_locked(master, oldaddr, newaddr, false);
1005 }
1006
1007 static int i3c_master_getmrl_locked(struct i3c_master_controller *master,
1008                                     struct i3c_device_info *info)
1009 {
1010         struct i3c_ccc_cmd_dest dest;
1011         struct i3c_ccc_mrl *mrl;
1012         struct i3c_ccc_cmd cmd;
1013         int ret;
1014
1015         mrl = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*mrl));
1016         if (!mrl)
1017                 return -ENOMEM;
1018
1019         /*
1020          * When the device does not have IBI payload GETMRL only returns 2
1021          * bytes of data.
1022          */
1023         if (!(info->bcr & I3C_BCR_IBI_PAYLOAD))
1024                 dest.payload.len -= 1;
1025
1026         i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETMRL, &dest, 1);
1027         ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
1028         if (ret)
1029                 goto out;
1030
1031         switch (dest.payload.len) {
1032         case 3:
1033                 info->max_ibi_len = mrl->ibi_len;
1034                 fallthrough;
1035         case 2:
1036                 info->max_read_len = be16_to_cpu(mrl->read_len);
1037                 break;
1038         default:
1039                 ret = -EIO;
1040                 goto out;
1041         }
1042
1043 out:
1044         i3c_ccc_cmd_dest_cleanup(&dest);
1045
1046         return ret;
1047 }
1048
1049 static int i3c_master_getmwl_locked(struct i3c_master_controller *master,
1050                                     struct i3c_device_info *info)
1051 {
1052         struct i3c_ccc_cmd_dest dest;
1053         struct i3c_ccc_mwl *mwl;
1054         struct i3c_ccc_cmd cmd;
1055         int ret;
1056
1057         mwl = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*mwl));
1058         if (!mwl)
1059                 return -ENOMEM;
1060
1061         i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETMWL, &dest, 1);
1062         ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
1063         if (ret)
1064                 goto out;
1065
1066         if (dest.payload.len != sizeof(*mwl)) {
1067                 ret = -EIO;
1068                 goto out;
1069         }
1070
1071         info->max_write_len = be16_to_cpu(mwl->len);
1072
1073 out:
1074         i3c_ccc_cmd_dest_cleanup(&dest);
1075
1076         return ret;
1077 }
1078
1079 static int i3c_master_getmxds_locked(struct i3c_master_controller *master,
1080                                      struct i3c_device_info *info)
1081 {
1082         struct i3c_ccc_getmxds *getmaxds;
1083         struct i3c_ccc_cmd_dest dest;
1084         struct i3c_ccc_cmd cmd;
1085         int ret;
1086
1087         getmaxds = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr,
1088                                          sizeof(*getmaxds));
1089         if (!getmaxds)
1090                 return -ENOMEM;
1091
1092         i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETMXDS, &dest, 1);
1093         ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
1094         if (ret)
1095                 goto out;
1096
1097         if (dest.payload.len != 2 && dest.payload.len != 5) {
1098                 ret = -EIO;
1099                 goto out;
1100         }
1101
1102         info->max_read_ds = getmaxds->maxrd;
1103         info->max_write_ds = getmaxds->maxwr;
1104         if (dest.payload.len == 5)
1105                 info->max_read_turnaround = getmaxds->maxrdturn[0] |
1106                                             ((u32)getmaxds->maxrdturn[1] << 8) |
1107                                             ((u32)getmaxds->maxrdturn[2] << 16);
1108
1109 out:
1110         i3c_ccc_cmd_dest_cleanup(&dest);
1111
1112         return ret;
1113 }
1114
1115 static int i3c_master_gethdrcap_locked(struct i3c_master_controller *master,
1116                                        struct i3c_device_info *info)
1117 {
1118         struct i3c_ccc_gethdrcap *gethdrcap;
1119         struct i3c_ccc_cmd_dest dest;
1120         struct i3c_ccc_cmd cmd;
1121         int ret;
1122
1123         gethdrcap = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr,
1124                                           sizeof(*gethdrcap));
1125         if (!gethdrcap)
1126                 return -ENOMEM;
1127
1128         i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETHDRCAP, &dest, 1);
1129         ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
1130         if (ret)
1131                 goto out;
1132
1133         if (dest.payload.len != 1) {
1134                 ret = -EIO;
1135                 goto out;
1136         }
1137
1138         info->hdr_cap = gethdrcap->modes;
1139
1140 out:
1141         i3c_ccc_cmd_dest_cleanup(&dest);
1142
1143         return ret;
1144 }
1145
1146 static int i3c_master_getpid_locked(struct i3c_master_controller *master,
1147                                     struct i3c_device_info *info)
1148 {
1149         struct i3c_ccc_getpid *getpid;
1150         struct i3c_ccc_cmd_dest dest;
1151         struct i3c_ccc_cmd cmd;
1152         int ret, i;
1153
1154         getpid = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*getpid));
1155         if (!getpid)
1156                 return -ENOMEM;
1157
1158         i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETPID, &dest, 1);
1159         ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
1160         if (ret)
1161                 goto out;
1162
1163         info->pid = 0;
1164         for (i = 0; i < sizeof(getpid->pid); i++) {
1165                 int sft = (sizeof(getpid->pid) - i - 1) * 8;
1166
1167                 info->pid |= (u64)getpid->pid[i] << sft;
1168         }
1169
1170 out:
1171         i3c_ccc_cmd_dest_cleanup(&dest);
1172
1173         return ret;
1174 }
1175
1176 static int i3c_master_getbcr_locked(struct i3c_master_controller *master,
1177                                     struct i3c_device_info *info)
1178 {
1179         struct i3c_ccc_getbcr *getbcr;
1180         struct i3c_ccc_cmd_dest dest;
1181         struct i3c_ccc_cmd cmd;
1182         int ret;
1183
1184         getbcr = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*getbcr));
1185         if (!getbcr)
1186                 return -ENOMEM;
1187
1188         i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETBCR, &dest, 1);
1189         ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
1190         if (ret)
1191                 goto out;
1192
1193         info->bcr = getbcr->bcr;
1194
1195 out:
1196         i3c_ccc_cmd_dest_cleanup(&dest);
1197
1198         return ret;
1199 }
1200
1201 static int i3c_master_getdcr_locked(struct i3c_master_controller *master,
1202                                     struct i3c_device_info *info)
1203 {
1204         struct i3c_ccc_getdcr *getdcr;
1205         struct i3c_ccc_cmd_dest dest;
1206         struct i3c_ccc_cmd cmd;
1207         int ret;
1208
1209         getdcr = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*getdcr));
1210         if (!getdcr)
1211                 return -ENOMEM;
1212
1213         i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETDCR, &dest, 1);
1214         ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
1215         if (ret)
1216                 goto out;
1217
1218         info->dcr = getdcr->dcr;
1219
1220 out:
1221         i3c_ccc_cmd_dest_cleanup(&dest);
1222
1223         return ret;
1224 }
1225
1226 static int i3c_master_retrieve_dev_info(struct i3c_dev_desc *dev)
1227 {
1228         struct i3c_master_controller *master = i3c_dev_get_master(dev);
1229         enum i3c_addr_slot_status slot_status;
1230         int ret;
1231
1232         if (!dev->info.dyn_addr)
1233                 return -EINVAL;
1234
1235         slot_status = i3c_bus_get_addr_slot_status(&master->bus,
1236                                                    dev->info.dyn_addr);
1237         if (slot_status == I3C_ADDR_SLOT_RSVD ||
1238             slot_status == I3C_ADDR_SLOT_I2C_DEV)
1239                 return -EINVAL;
1240
1241         ret = i3c_master_getpid_locked(master, &dev->info);
1242         if (ret)
1243                 return ret;
1244
1245         ret = i3c_master_getbcr_locked(master, &dev->info);
1246         if (ret)
1247                 return ret;
1248
1249         ret = i3c_master_getdcr_locked(master, &dev->info);
1250         if (ret)
1251                 return ret;
1252
1253         if (dev->info.bcr & I3C_BCR_MAX_DATA_SPEED_LIM) {
1254                 ret = i3c_master_getmxds_locked(master, &dev->info);
1255                 if (ret)
1256                         return ret;
1257         }
1258
1259         if (dev->info.bcr & I3C_BCR_IBI_PAYLOAD)
1260                 dev->info.max_ibi_len = 1;
1261
1262         i3c_master_getmrl_locked(master, &dev->info);
1263         i3c_master_getmwl_locked(master, &dev->info);
1264
1265         if (dev->info.bcr & I3C_BCR_HDR_CAP) {
1266                 ret = i3c_master_gethdrcap_locked(master, &dev->info);
1267                 if (ret)
1268                         return ret;
1269         }
1270
1271         return 0;
1272 }
1273
1274 static void i3c_master_put_i3c_addrs(struct i3c_dev_desc *dev)
1275 {
1276         struct i3c_master_controller *master = i3c_dev_get_master(dev);
1277
1278         if (dev->info.static_addr)
1279                 i3c_bus_set_addr_slot_status(&master->bus,
1280                                              dev->info.static_addr,
1281                                              I3C_ADDR_SLOT_FREE);
1282
1283         if (dev->info.dyn_addr)
1284                 i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr,
1285                                              I3C_ADDR_SLOT_FREE);
1286
1287         if (dev->boardinfo && dev->boardinfo->init_dyn_addr)
1288                 i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr,
1289                                              I3C_ADDR_SLOT_FREE);
1290 }
1291
1292 static int i3c_master_get_i3c_addrs(struct i3c_dev_desc *dev)
1293 {
1294         struct i3c_master_controller *master = i3c_dev_get_master(dev);
1295         enum i3c_addr_slot_status status;
1296
1297         if (!dev->info.static_addr && !dev->info.dyn_addr)
1298                 return 0;
1299
1300         if (dev->info.static_addr) {
1301                 status = i3c_bus_get_addr_slot_status(&master->bus,
1302                                                       dev->info.static_addr);
1303                 if (status != I3C_ADDR_SLOT_FREE)
1304                         return -EBUSY;
1305
1306                 i3c_bus_set_addr_slot_status(&master->bus,
1307                                              dev->info.static_addr,
1308                                              I3C_ADDR_SLOT_I3C_DEV);
1309         }
1310
1311         /*
1312          * ->init_dyn_addr should have been reserved before that, so, if we're
1313          * trying to apply a pre-reserved dynamic address, we should not try
1314          * to reserve the address slot a second time.
1315          */
1316         if (dev->info.dyn_addr &&
1317             (!dev->boardinfo ||
1318              dev->boardinfo->init_dyn_addr != dev->info.dyn_addr)) {
1319                 status = i3c_bus_get_addr_slot_status(&master->bus,
1320                                                       dev->info.dyn_addr);
1321                 if (status != I3C_ADDR_SLOT_FREE)
1322                         goto err_release_static_addr;
1323
1324                 i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr,
1325                                              I3C_ADDR_SLOT_I3C_DEV);
1326         }
1327
1328         return 0;
1329
1330 err_release_static_addr:
1331         if (dev->info.static_addr)
1332                 i3c_bus_set_addr_slot_status(&master->bus,
1333                                              dev->info.static_addr,
1334                                              I3C_ADDR_SLOT_FREE);
1335
1336         return -EBUSY;
1337 }
1338
1339 static int i3c_master_attach_i3c_dev(struct i3c_master_controller *master,
1340                                      struct i3c_dev_desc *dev)
1341 {
1342         int ret;
1343
1344         /*
1345          * We don't attach devices to the controller until they are
1346          * addressable on the bus.
1347          */
1348         if (!dev->info.static_addr && !dev->info.dyn_addr)
1349                 return 0;
1350
1351         ret = i3c_master_get_i3c_addrs(dev);
1352         if (ret)
1353                 return ret;
1354
1355         /* Do not attach the master device itself. */
1356         if (master->this != dev && master->ops->attach_i3c_dev) {
1357                 ret = master->ops->attach_i3c_dev(dev);
1358                 if (ret) {
1359                         i3c_master_put_i3c_addrs(dev);
1360                         return ret;
1361                 }
1362         }
1363
1364         list_add_tail(&dev->common.node, &master->bus.devs.i3c);
1365
1366         return 0;
1367 }
1368
1369 static int i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev,
1370                                        u8 old_dyn_addr)
1371 {
1372         struct i3c_master_controller *master = i3c_dev_get_master(dev);
1373         enum i3c_addr_slot_status status;
1374         int ret;
1375
1376         if (dev->info.dyn_addr != old_dyn_addr) {
1377                 status = i3c_bus_get_addr_slot_status(&master->bus,
1378                                                       dev->info.dyn_addr);
1379                 if (status != I3C_ADDR_SLOT_FREE)
1380                         return -EBUSY;
1381                 i3c_bus_set_addr_slot_status(&master->bus,
1382                                              dev->info.dyn_addr,
1383                                              I3C_ADDR_SLOT_I3C_DEV);
1384         }
1385
1386         if (master->ops->reattach_i3c_dev) {
1387                 ret = master->ops->reattach_i3c_dev(dev, old_dyn_addr);
1388                 if (ret) {
1389                         i3c_master_put_i3c_addrs(dev);
1390                         return ret;
1391                 }
1392         }
1393
1394         return 0;
1395 }
1396
1397 static void i3c_master_detach_i3c_dev(struct i3c_dev_desc *dev)
1398 {
1399         struct i3c_master_controller *master = i3c_dev_get_master(dev);
1400
1401         /* Do not detach the master device itself. */
1402         if (master->this != dev && master->ops->detach_i3c_dev)
1403                 master->ops->detach_i3c_dev(dev);
1404
1405         i3c_master_put_i3c_addrs(dev);
1406         list_del(&dev->common.node);
1407 }
1408
1409 static int i3c_master_attach_i2c_dev(struct i3c_master_controller *master,
1410                                      struct i2c_dev_desc *dev)
1411 {
1412         int ret;
1413
1414         if (master->ops->attach_i2c_dev) {
1415                 ret = master->ops->attach_i2c_dev(dev);
1416                 if (ret)
1417                         return ret;
1418         }
1419
1420         list_add_tail(&dev->common.node, &master->bus.devs.i2c);
1421
1422         return 0;
1423 }
1424
1425 static void i3c_master_detach_i2c_dev(struct i2c_dev_desc *dev)
1426 {
1427         struct i3c_master_controller *master = i2c_dev_get_master(dev);
1428
1429         list_del(&dev->common.node);
1430
1431         if (master->ops->detach_i2c_dev)
1432                 master->ops->detach_i2c_dev(dev);
1433 }
1434
1435 static void i3c_master_pre_assign_dyn_addr(struct i3c_dev_desc *dev)
1436 {
1437         struct i3c_master_controller *master = i3c_dev_get_master(dev);
1438         int ret;
1439
1440         if (!dev->boardinfo || !dev->boardinfo->init_dyn_addr ||
1441             !dev->boardinfo->static_addr)
1442                 return;
1443
1444         ret = i3c_master_setdasa_locked(master, dev->info.static_addr,
1445                                         dev->boardinfo->init_dyn_addr);
1446         if (ret)
1447                 return;
1448
1449         dev->info.dyn_addr = dev->boardinfo->init_dyn_addr;
1450         ret = i3c_master_reattach_i3c_dev(dev, 0);
1451         if (ret)
1452                 goto err_rstdaa;
1453
1454         ret = i3c_master_retrieve_dev_info(dev);
1455         if (ret)
1456                 goto err_rstdaa;
1457
1458         return;
1459
1460 err_rstdaa:
1461         i3c_master_rstdaa_locked(master, dev->boardinfo->init_dyn_addr);
1462 }
1463
1464 static void
1465 i3c_master_register_new_i3c_devs(struct i3c_master_controller *master)
1466 {
1467         struct i3c_dev_desc *desc;
1468         int ret;
1469
1470         if (!master->init_done)
1471                 return;
1472
1473         i3c_bus_for_each_i3cdev(&master->bus, desc) {
1474                 if (desc->dev || !desc->info.dyn_addr || desc == master->this)
1475                         continue;
1476
1477                 desc->dev = kzalloc(sizeof(*desc->dev), GFP_KERNEL);
1478                 if (!desc->dev)
1479                         continue;
1480
1481                 desc->dev->bus = &master->bus;
1482                 desc->dev->desc = desc;
1483                 desc->dev->dev.parent = &master->dev;
1484                 desc->dev->dev.type = &i3c_device_type;
1485                 desc->dev->dev.bus = &i3c_bus_type;
1486                 desc->dev->dev.release = i3c_device_release;
1487                 dev_set_name(&desc->dev->dev, "%d-%llx", master->bus.id,
1488                              desc->info.pid);
1489
1490                 if (desc->boardinfo)
1491                         desc->dev->dev.of_node = desc->boardinfo->of_node;
1492
1493                 ret = device_register(&desc->dev->dev);
1494                 if (ret)
1495                         dev_err(&master->dev,
1496                                 "Failed to add I3C device (err = %d)\n", ret);
1497         }
1498 }
1499
1500 /**
1501  * i3c_master_do_daa() - do a DAA (Dynamic Address Assignment)
1502  * @master: master doing the DAA
1503  *
1504  * This function is instantiating an I3C device object and adding it to the
1505  * I3C device list. All device information are automatically retrieved using
1506  * standard CCC commands.
1507  *
1508  * The I3C device object is returned in case the master wants to attach
1509  * private data to it using i3c_dev_set_master_data().
1510  *
1511  * This function must be called with the bus lock held in write mode.
1512  *
1513  * Return: a 0 in case of success, an negative error code otherwise.
1514  */
1515 int i3c_master_do_daa(struct i3c_master_controller *master)
1516 {
1517         int ret;
1518
1519         i3c_bus_maintenance_lock(&master->bus);
1520         ret = master->ops->do_daa(master);
1521         i3c_bus_maintenance_unlock(&master->bus);
1522
1523         if (ret)
1524                 return ret;
1525
1526         i3c_bus_normaluse_lock(&master->bus);
1527         i3c_master_register_new_i3c_devs(master);
1528         i3c_bus_normaluse_unlock(&master->bus);
1529
1530         return 0;
1531 }
1532 EXPORT_SYMBOL_GPL(i3c_master_do_daa);
1533
1534 /**
1535  * i3c_master_set_info() - set master device information
1536  * @master: master used to send frames on the bus
1537  * @info: I3C device information
1538  *
1539  * Set master device info. This should be called from
1540  * &i3c_master_controller_ops->bus_init().
1541  *
1542  * Not all &i3c_device_info fields are meaningful for a master device.
1543  * Here is a list of fields that should be properly filled:
1544  *
1545  * - &i3c_device_info->dyn_addr
1546  * - &i3c_device_info->bcr
1547  * - &i3c_device_info->dcr
1548  * - &i3c_device_info->pid
1549  * - &i3c_device_info->hdr_cap if %I3C_BCR_HDR_CAP bit is set in
1550  *   &i3c_device_info->bcr
1551  *
1552  * This function must be called with the bus lock held in maintenance mode.
1553  *
1554  * Return: 0 if @info contains valid information (not every piece of
1555  * information can be checked, but we can at least make sure @info->dyn_addr
1556  * and @info->bcr are correct), -EINVAL otherwise.
1557  */
1558 int i3c_master_set_info(struct i3c_master_controller *master,
1559                         const struct i3c_device_info *info)
1560 {
1561         struct i3c_dev_desc *i3cdev;
1562         int ret;
1563
1564         if (!i3c_bus_dev_addr_is_avail(&master->bus, info->dyn_addr))
1565                 return -EINVAL;
1566
1567         if (I3C_BCR_DEVICE_ROLE(info->bcr) == I3C_BCR_I3C_MASTER &&
1568             master->secondary)
1569                 return -EINVAL;
1570
1571         if (master->this)
1572                 return -EINVAL;
1573
1574         i3cdev = i3c_master_alloc_i3c_dev(master, info);
1575         if (IS_ERR(i3cdev))
1576                 return PTR_ERR(i3cdev);
1577
1578         master->this = i3cdev;
1579         master->bus.cur_master = master->this;
1580
1581         ret = i3c_master_attach_i3c_dev(master, i3cdev);
1582         if (ret)
1583                 goto err_free_dev;
1584
1585         return 0;
1586
1587 err_free_dev:
1588         i3c_master_free_i3c_dev(i3cdev);
1589
1590         return ret;
1591 }
1592 EXPORT_SYMBOL_GPL(i3c_master_set_info);
1593
1594 static void i3c_master_detach_free_devs(struct i3c_master_controller *master)
1595 {
1596         struct i3c_dev_desc *i3cdev, *i3ctmp;
1597         struct i2c_dev_desc *i2cdev, *i2ctmp;
1598
1599         list_for_each_entry_safe(i3cdev, i3ctmp, &master->bus.devs.i3c,
1600                                  common.node) {
1601                 i3c_master_detach_i3c_dev(i3cdev);
1602
1603                 if (i3cdev->boardinfo && i3cdev->boardinfo->init_dyn_addr)
1604                         i3c_bus_set_addr_slot_status(&master->bus,
1605                                         i3cdev->boardinfo->init_dyn_addr,
1606                                         I3C_ADDR_SLOT_FREE);
1607
1608                 i3c_master_free_i3c_dev(i3cdev);
1609         }
1610
1611         list_for_each_entry_safe(i2cdev, i2ctmp, &master->bus.devs.i2c,
1612                                  common.node) {
1613                 i3c_master_detach_i2c_dev(i2cdev);
1614                 i3c_bus_set_addr_slot_status(&master->bus,
1615                                              i2cdev->addr,
1616                                              I3C_ADDR_SLOT_FREE);
1617                 i3c_master_free_i2c_dev(i2cdev);
1618         }
1619 }
1620
1621 /**
1622  * i3c_master_bus_init() - initialize an I3C bus
1623  * @master: main master initializing the bus
1624  *
1625  * This function is following all initialisation steps described in the I3C
1626  * specification:
1627  *
1628  * 1. Attach I2C and statically defined I3C devs to the master so that the
1629  *    master can fill its internal device table appropriately
1630  *
1631  * 2. Call &i3c_master_controller_ops->bus_init() method to initialize
1632  *    the master controller. That's usually where the bus mode is selected
1633  *    (pure bus or mixed fast/slow bus)
1634  *
1635  * 3. Instruct all devices on the bus to drop their dynamic address. This is
1636  *    particularly important when the bus was previously configured by someone
1637  *    else (for example the bootloader)
1638  *
1639  * 4. Disable all slave events.
1640  *
1641  * 5. Pre-assign dynamic addresses requested by the FW with SETDASA for I3C
1642  *    devices that have a static address
1643  *
1644  * 6. Do a DAA (Dynamic Address Assignment) to assign dynamic addresses to all
1645  *    remaining I3C devices
1646  *
1647  * Once this is done, all I3C and I2C devices should be usable.
1648  *
1649  * Return: a 0 in case of success, an negative error code otherwise.
1650  */
1651 static int i3c_master_bus_init(struct i3c_master_controller *master)
1652 {
1653         enum i3c_addr_slot_status status;
1654         struct i2c_dev_boardinfo *i2cboardinfo;
1655         struct i3c_dev_boardinfo *i3cboardinfo;
1656         struct i3c_dev_desc *i3cdev;
1657         struct i2c_dev_desc *i2cdev;
1658         int ret;
1659
1660         /*
1661          * First attach all devices with static definitions provided by the
1662          * FW.
1663          */
1664         list_for_each_entry(i2cboardinfo, &master->boardinfo.i2c, node) {
1665                 status = i3c_bus_get_addr_slot_status(&master->bus,
1666                                                       i2cboardinfo->base.addr);
1667                 if (status != I3C_ADDR_SLOT_FREE) {
1668                         ret = -EBUSY;
1669                         goto err_detach_devs;
1670                 }
1671
1672                 i3c_bus_set_addr_slot_status(&master->bus,
1673                                              i2cboardinfo->base.addr,
1674                                              I3C_ADDR_SLOT_I2C_DEV);
1675
1676                 i2cdev = i3c_master_alloc_i2c_dev(master, i2cboardinfo);
1677                 if (IS_ERR(i2cdev)) {
1678                         ret = PTR_ERR(i2cdev);
1679                         goto err_detach_devs;
1680                 }
1681
1682                 ret = i3c_master_attach_i2c_dev(master, i2cdev);
1683                 if (ret) {
1684                         i3c_master_free_i2c_dev(i2cdev);
1685                         goto err_detach_devs;
1686                 }
1687         }
1688         list_for_each_entry(i3cboardinfo, &master->boardinfo.i3c, node) {
1689                 struct i3c_device_info info = {
1690                         .static_addr = i3cboardinfo->static_addr,
1691                 };
1692
1693                 if (i3cboardinfo->init_dyn_addr) {
1694                         status = i3c_bus_get_addr_slot_status(&master->bus,
1695                                                 i3cboardinfo->init_dyn_addr);
1696                         if (status != I3C_ADDR_SLOT_FREE) {
1697                                 ret = -EBUSY;
1698                                 goto err_detach_devs;
1699                         }
1700                 }
1701
1702                 i3cdev = i3c_master_alloc_i3c_dev(master, &info);
1703                 if (IS_ERR(i3cdev)) {
1704                         ret = PTR_ERR(i3cdev);
1705                         goto err_detach_devs;
1706                 }
1707
1708                 i3cdev->boardinfo = i3cboardinfo;
1709
1710                 ret = i3c_master_attach_i3c_dev(master, i3cdev);
1711                 if (ret) {
1712                         i3c_master_free_i3c_dev(i3cdev);
1713                         goto err_detach_devs;
1714                 }
1715         }
1716
1717         /*
1718          * Now execute the controller specific ->bus_init() routine, which
1719          * might configure its internal logic to match the bus limitations.
1720          */
1721         ret = master->ops->bus_init(master);
1722         if (ret)
1723                 goto err_detach_devs;
1724
1725         /*
1726          * The master device should have been instantiated in ->bus_init(),
1727          * complain if this was not the case.
1728          */
1729         if (!master->this) {
1730                 dev_err(&master->dev,
1731                         "master_set_info() was not called in ->bus_init()\n");
1732                 ret = -EINVAL;
1733                 goto err_bus_cleanup;
1734         }
1735
1736         /*
1737          * Reset all dynamic address that may have been assigned before
1738          * (assigned by the bootloader for example).
1739          */
1740         ret = i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR);
1741         if (ret && ret != I3C_ERROR_M2)
1742                 goto err_bus_cleanup;
1743
1744         /* Disable all slave events before starting DAA. */
1745         ret = i3c_master_disec_locked(master, I3C_BROADCAST_ADDR,
1746                                       I3C_CCC_EVENT_SIR | I3C_CCC_EVENT_MR |
1747                                       I3C_CCC_EVENT_HJ);
1748         if (ret && ret != I3C_ERROR_M2)
1749                 goto err_bus_cleanup;
1750
1751         /*
1752          * Pre-assign dynamic address and retrieve device information if
1753          * needed.
1754          */
1755         i3c_bus_for_each_i3cdev(&master->bus, i3cdev)
1756                 i3c_master_pre_assign_dyn_addr(i3cdev);
1757
1758         ret = i3c_master_do_daa(master);
1759         if (ret)
1760                 goto err_rstdaa;
1761
1762         return 0;
1763
1764 err_rstdaa:
1765         i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR);
1766
1767 err_bus_cleanup:
1768         if (master->ops->bus_cleanup)
1769                 master->ops->bus_cleanup(master);
1770
1771 err_detach_devs:
1772         i3c_master_detach_free_devs(master);
1773
1774         return ret;
1775 }
1776
1777 static void i3c_master_bus_cleanup(struct i3c_master_controller *master)
1778 {
1779         if (master->ops->bus_cleanup)
1780                 master->ops->bus_cleanup(master);
1781
1782         i3c_master_detach_free_devs(master);
1783 }
1784
1785 static struct i3c_dev_desc *
1786 i3c_master_search_i3c_dev_duplicate(struct i3c_dev_desc *refdev)
1787 {
1788         struct i3c_master_controller *master = i3c_dev_get_master(refdev);
1789         struct i3c_dev_desc *i3cdev;
1790
1791         i3c_bus_for_each_i3cdev(&master->bus, i3cdev) {
1792                 if (i3cdev != refdev && i3cdev->info.pid == refdev->info.pid)
1793                         return i3cdev;
1794         }
1795
1796         return NULL;
1797 }
1798
1799 /**
1800  * i3c_master_add_i3c_dev_locked() - add an I3C slave to the bus
1801  * @master: master used to send frames on the bus
1802  * @addr: I3C slave dynamic address assigned to the device
1803  *
1804  * This function is instantiating an I3C device object and adding it to the
1805  * I3C device list. All device information are automatically retrieved using
1806  * standard CCC commands.
1807  *
1808  * The I3C device object is returned in case the master wants to attach
1809  * private data to it using i3c_dev_set_master_data().
1810  *
1811  * This function must be called with the bus lock held in write mode.
1812  *
1813  * Return: a 0 in case of success, an negative error code otherwise.
1814  */
1815 int i3c_master_add_i3c_dev_locked(struct i3c_master_controller *master,
1816                                   u8 addr)
1817 {
1818         struct i3c_device_info info = { .dyn_addr = addr };
1819         struct i3c_dev_desc *newdev, *olddev;
1820         u8 old_dyn_addr = addr, expected_dyn_addr;
1821         struct i3c_ibi_setup ibireq = { };
1822         bool enable_ibi = false;
1823         int ret;
1824
1825         if (!master)
1826                 return -EINVAL;
1827
1828         newdev = i3c_master_alloc_i3c_dev(master, &info);
1829         if (IS_ERR(newdev))
1830                 return PTR_ERR(newdev);
1831
1832         ret = i3c_master_attach_i3c_dev(master, newdev);
1833         if (ret)
1834                 goto err_free_dev;
1835
1836         ret = i3c_master_retrieve_dev_info(newdev);
1837         if (ret)
1838                 goto err_detach_dev;
1839
1840         olddev = i3c_master_search_i3c_dev_duplicate(newdev);
1841         if (olddev) {
1842                 newdev->boardinfo = olddev->boardinfo;
1843                 newdev->info.static_addr = olddev->info.static_addr;
1844                 newdev->dev = olddev->dev;
1845                 if (newdev->dev)
1846                         newdev->dev->desc = newdev;
1847
1848                 /*
1849                  * We need to restore the IBI state too, so let's save the
1850                  * IBI information and try to restore them after olddev has
1851                  * been detached+released and its IBI has been stopped and
1852                  * the associated resources have been freed.
1853                  */
1854                 mutex_lock(&olddev->ibi_lock);
1855                 if (olddev->ibi) {
1856                         ibireq.handler = olddev->ibi->handler;
1857                         ibireq.max_payload_len = olddev->ibi->max_payload_len;
1858                         ibireq.num_slots = olddev->ibi->num_slots;
1859
1860                         if (olddev->ibi->enabled) {
1861                                 enable_ibi = true;
1862                                 i3c_dev_disable_ibi_locked(olddev);
1863                         }
1864
1865                         i3c_dev_free_ibi_locked(olddev);
1866                 }
1867                 mutex_unlock(&olddev->ibi_lock);
1868
1869                 old_dyn_addr = olddev->info.dyn_addr;
1870
1871                 i3c_master_detach_i3c_dev(olddev);
1872                 i3c_master_free_i3c_dev(olddev);
1873         }
1874
1875         ret = i3c_master_reattach_i3c_dev(newdev, old_dyn_addr);
1876         if (ret)
1877                 goto err_detach_dev;
1878
1879         /*
1880          * Depending on our previous state, the expected dynamic address might
1881          * differ:
1882          * - if the device already had a dynamic address assigned, let's try to
1883          *   re-apply this one
1884          * - if the device did not have a dynamic address and the firmware
1885          *   requested a specific address, pick this one
1886          * - in any other case, keep the address automatically assigned by the
1887          *   master
1888          */
1889         if (old_dyn_addr && old_dyn_addr != newdev->info.dyn_addr)
1890                 expected_dyn_addr = old_dyn_addr;
1891         else if (newdev->boardinfo && newdev->boardinfo->init_dyn_addr)
1892                 expected_dyn_addr = newdev->boardinfo->init_dyn_addr;
1893         else
1894                 expected_dyn_addr = newdev->info.dyn_addr;
1895
1896         if (newdev->info.dyn_addr != expected_dyn_addr) {
1897                 /*
1898                  * Try to apply the expected dynamic address. If it fails, keep
1899                  * the address assigned by the master.
1900                  */
1901                 ret = i3c_master_setnewda_locked(master,
1902                                                  newdev->info.dyn_addr,
1903                                                  expected_dyn_addr);
1904                 if (!ret) {
1905                         old_dyn_addr = newdev->info.dyn_addr;
1906                         newdev->info.dyn_addr = expected_dyn_addr;
1907                         i3c_master_reattach_i3c_dev(newdev, old_dyn_addr);
1908                 } else {
1909                         dev_err(&master->dev,
1910                                 "Failed to assign reserved/old address to device %d%llx",
1911                                 master->bus.id, newdev->info.pid);
1912                 }
1913         }
1914
1915         /*
1916          * Now is time to try to restore the IBI setup. If we're lucky,
1917          * everything works as before, otherwise, all we can do is complain.
1918          * FIXME: maybe we should add callback to inform the driver that it
1919          * should request the IBI again instead of trying to hide that from
1920          * him.
1921          */
1922         if (ibireq.handler) {
1923                 mutex_lock(&newdev->ibi_lock);
1924                 ret = i3c_dev_request_ibi_locked(newdev, &ibireq);
1925                 if (ret) {
1926                         dev_err(&master->dev,
1927                                 "Failed to request IBI on device %d-%llx",
1928                                 master->bus.id, newdev->info.pid);
1929                 } else if (enable_ibi) {
1930                         ret = i3c_dev_enable_ibi_locked(newdev);
1931                         if (ret)
1932                                 dev_err(&master->dev,
1933                                         "Failed to re-enable IBI on device %d-%llx",
1934                                         master->bus.id, newdev->info.pid);
1935                 }
1936                 mutex_unlock(&newdev->ibi_lock);
1937         }
1938
1939         return 0;
1940
1941 err_detach_dev:
1942         if (newdev->dev && newdev->dev->desc)
1943                 newdev->dev->desc = NULL;
1944
1945         i3c_master_detach_i3c_dev(newdev);
1946
1947 err_free_dev:
1948         i3c_master_free_i3c_dev(newdev);
1949
1950         return ret;
1951 }
1952 EXPORT_SYMBOL_GPL(i3c_master_add_i3c_dev_locked);
1953
1954 #define OF_I3C_REG1_IS_I2C_DEV                  BIT(31)
1955
1956 static int
1957 of_i3c_master_add_i2c_boardinfo(struct i3c_master_controller *master,
1958                                 struct device_node *node, u32 *reg)
1959 {
1960         struct i2c_dev_boardinfo *boardinfo;
1961         struct device *dev = &master->dev;
1962         int ret;
1963
1964         boardinfo = devm_kzalloc(dev, sizeof(*boardinfo), GFP_KERNEL);
1965         if (!boardinfo)
1966                 return -ENOMEM;
1967
1968         ret = of_i2c_get_board_info(dev, node, &boardinfo->base);
1969         if (ret)
1970                 return ret;
1971
1972         /*
1973          * The I3C Specification does not clearly say I2C devices with 10-bit
1974          * address are supported. These devices can't be passed properly through
1975          * DEFSLVS command.
1976          */
1977         if (boardinfo->base.flags & I2C_CLIENT_TEN) {
1978                 dev_err(dev, "I2C device with 10 bit address not supported.");
1979                 return -ENOTSUPP;
1980         }
1981
1982         /* LVR is encoded in reg[2]. */
1983         boardinfo->lvr = reg[2];
1984
1985         list_add_tail(&boardinfo->node, &master->boardinfo.i2c);
1986         of_node_get(node);
1987
1988         return 0;
1989 }
1990
1991 static int
1992 of_i3c_master_add_i3c_boardinfo(struct i3c_master_controller *master,
1993                                 struct device_node *node, u32 *reg)
1994 {
1995         struct i3c_dev_boardinfo *boardinfo;
1996         struct device *dev = &master->dev;
1997         enum i3c_addr_slot_status addrstatus;
1998         u32 init_dyn_addr = 0;
1999
2000         boardinfo = devm_kzalloc(dev, sizeof(*boardinfo), GFP_KERNEL);
2001         if (!boardinfo)
2002                 return -ENOMEM;
2003
2004         if (reg[0]) {
2005                 if (reg[0] > I3C_MAX_ADDR)
2006                         return -EINVAL;
2007
2008                 addrstatus = i3c_bus_get_addr_slot_status(&master->bus,
2009                                                           reg[0]);
2010                 if (addrstatus != I3C_ADDR_SLOT_FREE)
2011                         return -EINVAL;
2012         }
2013
2014         boardinfo->static_addr = reg[0];
2015
2016         if (!of_property_read_u32(node, "assigned-address", &init_dyn_addr)) {
2017                 if (init_dyn_addr > I3C_MAX_ADDR)
2018                         return -EINVAL;
2019
2020                 addrstatus = i3c_bus_get_addr_slot_status(&master->bus,
2021                                                           init_dyn_addr);
2022                 if (addrstatus != I3C_ADDR_SLOT_FREE)
2023                         return -EINVAL;
2024         }
2025
2026         boardinfo->pid = ((u64)reg[1] << 32) | reg[2];
2027
2028         if ((boardinfo->pid & GENMASK_ULL(63, 48)) ||
2029             I3C_PID_RND_LOWER_32BITS(boardinfo->pid))
2030                 return -EINVAL;
2031
2032         boardinfo->init_dyn_addr = init_dyn_addr;
2033         boardinfo->of_node = of_node_get(node);
2034         list_add_tail(&boardinfo->node, &master->boardinfo.i3c);
2035
2036         return 0;
2037 }
2038
2039 static int of_i3c_master_add_dev(struct i3c_master_controller *master,
2040                                  struct device_node *node)
2041 {
2042         u32 reg[3];
2043         int ret;
2044
2045         if (!master || !node)
2046                 return -EINVAL;
2047
2048         ret = of_property_read_u32_array(node, "reg", reg, ARRAY_SIZE(reg));
2049         if (ret)
2050                 return ret;
2051
2052         /*
2053          * The manufacturer ID can't be 0. If reg[1] == 0 that means we're
2054          * dealing with an I2C device.
2055          */
2056         if (!reg[1])
2057                 ret = of_i3c_master_add_i2c_boardinfo(master, node, reg);
2058         else
2059                 ret = of_i3c_master_add_i3c_boardinfo(master, node, reg);
2060
2061         return ret;
2062 }
2063
2064 static int of_populate_i3c_bus(struct i3c_master_controller *master)
2065 {
2066         struct device *dev = &master->dev;
2067         struct device_node *i3cbus_np = dev->of_node;
2068         struct device_node *node;
2069         int ret;
2070         u32 val;
2071
2072         if (!i3cbus_np)
2073                 return 0;
2074
2075         for_each_available_child_of_node(i3cbus_np, node) {
2076                 ret = of_i3c_master_add_dev(master, node);
2077                 if (ret) {
2078                         of_node_put(node);
2079                         return ret;
2080                 }
2081         }
2082
2083         /*
2084          * The user might want to limit I2C and I3C speed in case some devices
2085          * on the bus are not supporting typical rates, or if the bus topology
2086          * prevents it from using max possible rate.
2087          */
2088         if (!of_property_read_u32(i3cbus_np, "i2c-scl-hz", &val))
2089                 master->bus.scl_rate.i2c = val;
2090
2091         if (!of_property_read_u32(i3cbus_np, "i3c-scl-hz", &val))
2092                 master->bus.scl_rate.i3c = val;
2093
2094         return 0;
2095 }
2096
2097 static int i3c_master_i2c_adapter_xfer(struct i2c_adapter *adap,
2098                                        struct i2c_msg *xfers, int nxfers)
2099 {
2100         struct i3c_master_controller *master = i2c_adapter_to_i3c_master(adap);
2101         struct i2c_dev_desc *dev;
2102         int i, ret;
2103         u16 addr;
2104
2105         if (!xfers || !master || nxfers <= 0)
2106                 return -EINVAL;
2107
2108         if (!master->ops->i2c_xfers)
2109                 return -ENOTSUPP;
2110
2111         /* Doing transfers to different devices is not supported. */
2112         addr = xfers[0].addr;
2113         for (i = 1; i < nxfers; i++) {
2114                 if (addr != xfers[i].addr)
2115                         return -ENOTSUPP;
2116         }
2117
2118         i3c_bus_normaluse_lock(&master->bus);
2119         dev = i3c_master_find_i2c_dev_by_addr(master, addr);
2120         if (!dev)
2121                 ret = -ENOENT;
2122         else
2123                 ret = master->ops->i2c_xfers(dev, xfers, nxfers);
2124         i3c_bus_normaluse_unlock(&master->bus);
2125
2126         return ret ? ret : nxfers;
2127 }
2128
2129 static u32 i3c_master_i2c_funcs(struct i2c_adapter *adapter)
2130 {
2131         return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
2132 }
2133
2134 static const struct i2c_algorithm i3c_master_i2c_algo = {
2135         .master_xfer = i3c_master_i2c_adapter_xfer,
2136         .functionality = i3c_master_i2c_funcs,
2137 };
2138
2139 static int i3c_master_i2c_adapter_init(struct i3c_master_controller *master)
2140 {
2141         struct i2c_adapter *adap = i3c_master_to_i2c_adapter(master);
2142         struct i2c_dev_desc *i2cdev;
2143         int ret;
2144
2145         adap->dev.parent = master->dev.parent;
2146         adap->owner = master->dev.parent->driver->owner;
2147         adap->algo = &i3c_master_i2c_algo;
2148         strncpy(adap->name, dev_name(master->dev.parent), sizeof(adap->name));
2149
2150         /* FIXME: Should we allow i3c masters to override these values? */
2151         adap->timeout = 1000;
2152         adap->retries = 3;
2153
2154         ret = i2c_add_adapter(adap);
2155         if (ret)
2156                 return ret;
2157
2158         /*
2159          * We silently ignore failures here. The bus should keep working
2160          * correctly even if one or more i2c devices are not registered.
2161          */
2162         i3c_bus_for_each_i2cdev(&master->bus, i2cdev)
2163                 i2cdev->dev = i2c_new_client_device(adap, &i2cdev->boardinfo->base);
2164
2165         return 0;
2166 }
2167
2168 static void i3c_master_i2c_adapter_cleanup(struct i3c_master_controller *master)
2169 {
2170         struct i2c_dev_desc *i2cdev;
2171
2172         i2c_del_adapter(&master->i2c);
2173
2174         i3c_bus_for_each_i2cdev(&master->bus, i2cdev)
2175                 i2cdev->dev = NULL;
2176 }
2177
2178 static void i3c_master_unregister_i3c_devs(struct i3c_master_controller *master)
2179 {
2180         struct i3c_dev_desc *i3cdev;
2181
2182         i3c_bus_for_each_i3cdev(&master->bus, i3cdev) {
2183                 if (!i3cdev->dev)
2184                         continue;
2185
2186                 i3cdev->dev->desc = NULL;
2187                 if (device_is_registered(&i3cdev->dev->dev))
2188                         device_unregister(&i3cdev->dev->dev);
2189                 else
2190                         put_device(&i3cdev->dev->dev);
2191                 i3cdev->dev = NULL;
2192         }
2193 }
2194
2195 /**
2196  * i3c_master_queue_ibi() - Queue an IBI
2197  * @dev: the device this IBI is coming from
2198  * @slot: the IBI slot used to store the payload
2199  *
2200  * Queue an IBI to the controller workqueue. The IBI handler attached to
2201  * the dev will be called from a workqueue context.
2202  */
2203 void i3c_master_queue_ibi(struct i3c_dev_desc *dev, struct i3c_ibi_slot *slot)
2204 {
2205         atomic_inc(&dev->ibi->pending_ibis);
2206         queue_work(dev->common.master->wq, &slot->work);
2207 }
2208 EXPORT_SYMBOL_GPL(i3c_master_queue_ibi);
2209
2210 static void i3c_master_handle_ibi(struct work_struct *work)
2211 {
2212         struct i3c_ibi_slot *slot = container_of(work, struct i3c_ibi_slot,
2213                                                  work);
2214         struct i3c_dev_desc *dev = slot->dev;
2215         struct i3c_master_controller *master = i3c_dev_get_master(dev);
2216         struct i3c_ibi_payload payload;
2217
2218         payload.data = slot->data;
2219         payload.len = slot->len;
2220
2221         if (dev->dev)
2222                 dev->ibi->handler(dev->dev, &payload);
2223
2224         master->ops->recycle_ibi_slot(dev, slot);
2225         if (atomic_dec_and_test(&dev->ibi->pending_ibis))
2226                 complete(&dev->ibi->all_ibis_handled);
2227 }
2228
2229 static void i3c_master_init_ibi_slot(struct i3c_dev_desc *dev,
2230                                      struct i3c_ibi_slot *slot)
2231 {
2232         slot->dev = dev;
2233         INIT_WORK(&slot->work, i3c_master_handle_ibi);
2234 }
2235
2236 struct i3c_generic_ibi_slot {
2237         struct list_head node;
2238         struct i3c_ibi_slot base;
2239 };
2240
2241 struct i3c_generic_ibi_pool {
2242         spinlock_t lock;
2243         unsigned int num_slots;
2244         struct i3c_generic_ibi_slot *slots;
2245         void *payload_buf;
2246         struct list_head free_slots;
2247         struct list_head pending;
2248 };
2249
2250 /**
2251  * i3c_generic_ibi_free_pool() - Free a generic IBI pool
2252  * @pool: the IBI pool to free
2253  *
2254  * Free all IBI slots allated by a generic IBI pool.
2255  */
2256 void i3c_generic_ibi_free_pool(struct i3c_generic_ibi_pool *pool)
2257 {
2258         struct i3c_generic_ibi_slot *slot;
2259         unsigned int nslots = 0;
2260
2261         while (!list_empty(&pool->free_slots)) {
2262                 slot = list_first_entry(&pool->free_slots,
2263                                         struct i3c_generic_ibi_slot, node);
2264                 list_del(&slot->node);
2265                 nslots++;
2266         }
2267
2268         /*
2269          * If the number of freed slots is not equal to the number of allocated
2270          * slots we have a leak somewhere.
2271          */
2272         WARN_ON(nslots != pool->num_slots);
2273
2274         kfree(pool->payload_buf);
2275         kfree(pool->slots);
2276         kfree(pool);
2277 }
2278 EXPORT_SYMBOL_GPL(i3c_generic_ibi_free_pool);
2279
2280 /**
2281  * i3c_generic_ibi_alloc_pool() - Create a generic IBI pool
2282  * @dev: the device this pool will be used for
2283  * @req: IBI setup request describing what the device driver expects
2284  *
2285  * Create a generic IBI pool based on the information provided in @req.
2286  *
2287  * Return: a valid IBI pool in case of success, an ERR_PTR() otherwise.
2288  */
2289 struct i3c_generic_ibi_pool *
2290 i3c_generic_ibi_alloc_pool(struct i3c_dev_desc *dev,
2291                            const struct i3c_ibi_setup *req)
2292 {
2293         struct i3c_generic_ibi_pool *pool;
2294         struct i3c_generic_ibi_slot *slot;
2295         unsigned int i;
2296         int ret;
2297
2298         pool = kzalloc(sizeof(*pool), GFP_KERNEL);
2299         if (!pool)
2300                 return ERR_PTR(-ENOMEM);
2301
2302         spin_lock_init(&pool->lock);
2303         INIT_LIST_HEAD(&pool->free_slots);
2304         INIT_LIST_HEAD(&pool->pending);
2305
2306         pool->slots = kcalloc(req->num_slots, sizeof(*slot), GFP_KERNEL);
2307         if (!pool->slots) {
2308                 ret = -ENOMEM;
2309                 goto err_free_pool;
2310         }
2311
2312         if (req->max_payload_len) {
2313                 pool->payload_buf = kcalloc(req->num_slots,
2314                                             req->max_payload_len, GFP_KERNEL);
2315                 if (!pool->payload_buf) {
2316                         ret = -ENOMEM;
2317                         goto err_free_pool;
2318                 }
2319         }
2320
2321         for (i = 0; i < req->num_slots; i++) {
2322                 slot = &pool->slots[i];
2323                 i3c_master_init_ibi_slot(dev, &slot->base);
2324
2325                 if (req->max_payload_len)
2326                         slot->base.data = pool->payload_buf +
2327                                           (i * req->max_payload_len);
2328
2329                 list_add_tail(&slot->node, &pool->free_slots);
2330                 pool->num_slots++;
2331         }
2332
2333         return pool;
2334
2335 err_free_pool:
2336         i3c_generic_ibi_free_pool(pool);
2337         return ERR_PTR(ret);
2338 }
2339 EXPORT_SYMBOL_GPL(i3c_generic_ibi_alloc_pool);
2340
2341 /**
2342  * i3c_generic_ibi_get_free_slot() - Get a free slot from a generic IBI pool
2343  * @pool: the pool to query an IBI slot on
2344  *
2345  * Search for a free slot in a generic IBI pool.
2346  * The slot should be returned to the pool using i3c_generic_ibi_recycle_slot()
2347  * when it's no longer needed.
2348  *
2349  * Return: a pointer to a free slot, or NULL if there's no free slot available.
2350  */
2351 struct i3c_ibi_slot *
2352 i3c_generic_ibi_get_free_slot(struct i3c_generic_ibi_pool *pool)
2353 {
2354         struct i3c_generic_ibi_slot *slot;
2355         unsigned long flags;
2356
2357         spin_lock_irqsave(&pool->lock, flags);
2358         slot = list_first_entry_or_null(&pool->free_slots,
2359                                         struct i3c_generic_ibi_slot, node);
2360         if (slot)
2361                 list_del(&slot->node);
2362         spin_unlock_irqrestore(&pool->lock, flags);
2363
2364         return slot ? &slot->base : NULL;
2365 }
2366 EXPORT_SYMBOL_GPL(i3c_generic_ibi_get_free_slot);
2367
2368 /**
2369  * i3c_generic_ibi_recycle_slot() - Return a slot to a generic IBI pool
2370  * @pool: the pool to return the IBI slot to
2371  * @s: IBI slot to recycle
2372  *
2373  * Add an IBI slot back to its generic IBI pool. Should be called from the
2374  * master driver struct_master_controller_ops->recycle_ibi() method.
2375  */
2376 void i3c_generic_ibi_recycle_slot(struct i3c_generic_ibi_pool *pool,
2377                                   struct i3c_ibi_slot *s)
2378 {
2379         struct i3c_generic_ibi_slot *slot;
2380         unsigned long flags;
2381
2382         if (!s)
2383                 return;
2384
2385         slot = container_of(s, struct i3c_generic_ibi_slot, base);
2386         spin_lock_irqsave(&pool->lock, flags);
2387         list_add_tail(&slot->node, &pool->free_slots);
2388         spin_unlock_irqrestore(&pool->lock, flags);
2389 }
2390 EXPORT_SYMBOL_GPL(i3c_generic_ibi_recycle_slot);
2391
2392 static int i3c_master_check_ops(const struct i3c_master_controller_ops *ops)
2393 {
2394         if (!ops || !ops->bus_init || !ops->priv_xfers ||
2395             !ops->send_ccc_cmd || !ops->do_daa || !ops->i2c_xfers)
2396                 return -EINVAL;
2397
2398         if (ops->request_ibi &&
2399             (!ops->enable_ibi || !ops->disable_ibi || !ops->free_ibi ||
2400              !ops->recycle_ibi_slot))
2401                 return -EINVAL;
2402
2403         return 0;
2404 }
2405
2406 /**
2407  * i3c_master_register() - register an I3C master
2408  * @master: master used to send frames on the bus
2409  * @parent: the parent device (the one that provides this I3C master
2410  *          controller)
2411  * @ops: the master controller operations
2412  * @secondary: true if you are registering a secondary master. Will return
2413  *             -ENOTSUPP if set to true since secondary masters are not yet
2414  *             supported
2415  *
2416  * This function takes care of everything for you:
2417  *
2418  * - creates and initializes the I3C bus
2419  * - populates the bus with static I2C devs if @parent->of_node is not
2420  *   NULL
2421  * - registers all I3C devices added by the controller during bus
2422  *   initialization
2423  * - registers the I2C adapter and all I2C devices
2424  *
2425  * Return: 0 in case of success, a negative error code otherwise.
2426  */
2427 int i3c_master_register(struct i3c_master_controller *master,
2428                         struct device *parent,
2429                         const struct i3c_master_controller_ops *ops,
2430                         bool secondary)
2431 {
2432         unsigned long i2c_scl_rate = I3C_BUS_I2C_FM_PLUS_SCL_RATE;
2433         struct i3c_bus *i3cbus = i3c_master_get_bus(master);
2434         enum i3c_bus_mode mode = I3C_BUS_MODE_PURE;
2435         struct i2c_dev_boardinfo *i2cbi;
2436         int ret;
2437
2438         /* We do not support secondary masters yet. */
2439         if (secondary)
2440                 return -ENOTSUPP;
2441
2442         ret = i3c_master_check_ops(ops);
2443         if (ret)
2444                 return ret;
2445
2446         master->dev.parent = parent;
2447         master->dev.of_node = of_node_get(parent->of_node);
2448         master->dev.bus = &i3c_bus_type;
2449         master->dev.type = &i3c_masterdev_type;
2450         master->dev.release = i3c_masterdev_release;
2451         master->ops = ops;
2452         master->secondary = secondary;
2453         INIT_LIST_HEAD(&master->boardinfo.i2c);
2454         INIT_LIST_HEAD(&master->boardinfo.i3c);
2455
2456         ret = i3c_bus_init(i3cbus);
2457         if (ret)
2458                 return ret;
2459
2460         device_initialize(&master->dev);
2461         dev_set_name(&master->dev, "i3c-%d", i3cbus->id);
2462
2463         ret = of_populate_i3c_bus(master);
2464         if (ret)
2465                 goto err_put_dev;
2466
2467         list_for_each_entry(i2cbi, &master->boardinfo.i2c, node) {
2468                 switch (i2cbi->lvr & I3C_LVR_I2C_INDEX_MASK) {
2469                 case I3C_LVR_I2C_INDEX(0):
2470                         if (mode < I3C_BUS_MODE_MIXED_FAST)
2471                                 mode = I3C_BUS_MODE_MIXED_FAST;
2472                         break;
2473                 case I3C_LVR_I2C_INDEX(1):
2474                         if (mode < I3C_BUS_MODE_MIXED_LIMITED)
2475                                 mode = I3C_BUS_MODE_MIXED_LIMITED;
2476                         break;
2477                 case I3C_LVR_I2C_INDEX(2):
2478                         if (mode < I3C_BUS_MODE_MIXED_SLOW)
2479                                 mode = I3C_BUS_MODE_MIXED_SLOW;
2480                         break;
2481                 default:
2482                         ret = -EINVAL;
2483                         goto err_put_dev;
2484                 }
2485
2486                 if (i2cbi->lvr & I3C_LVR_I2C_FM_MODE)
2487                         i2c_scl_rate = I3C_BUS_I2C_FM_SCL_RATE;
2488         }
2489
2490         ret = i3c_bus_set_mode(i3cbus, mode, i2c_scl_rate);
2491         if (ret)
2492                 goto err_put_dev;
2493
2494         master->wq = alloc_workqueue("%s", 0, 0, dev_name(parent));
2495         if (!master->wq) {
2496                 ret = -ENOMEM;
2497                 goto err_put_dev;
2498         }
2499
2500         ret = i3c_master_bus_init(master);
2501         if (ret)
2502                 goto err_put_dev;
2503
2504         ret = device_add(&master->dev);
2505         if (ret)
2506                 goto err_cleanup_bus;
2507
2508         /*
2509          * Expose our I3C bus as an I2C adapter so that I2C devices are exposed
2510          * through the I2C subsystem.
2511          */
2512         ret = i3c_master_i2c_adapter_init(master);
2513         if (ret)
2514                 goto err_del_dev;
2515
2516         /*
2517          * We're done initializing the bus and the controller, we can now
2518          * register I3C devices discovered during the initial DAA.
2519          */
2520         master->init_done = true;
2521         i3c_bus_normaluse_lock(&master->bus);
2522         i3c_master_register_new_i3c_devs(master);
2523         i3c_bus_normaluse_unlock(&master->bus);
2524
2525         return 0;
2526
2527 err_del_dev:
2528         device_del(&master->dev);
2529
2530 err_cleanup_bus:
2531         i3c_master_bus_cleanup(master);
2532
2533 err_put_dev:
2534         put_device(&master->dev);
2535
2536         return ret;
2537 }
2538 EXPORT_SYMBOL_GPL(i3c_master_register);
2539
2540 /**
2541  * i3c_master_unregister() - unregister an I3C master
2542  * @master: master used to send frames on the bus
2543  *
2544  * Basically undo everything done in i3c_master_register().
2545  *
2546  * Return: 0 in case of success, a negative error code otherwise.
2547  */
2548 int i3c_master_unregister(struct i3c_master_controller *master)
2549 {
2550         i3c_master_i2c_adapter_cleanup(master);
2551         i3c_master_unregister_i3c_devs(master);
2552         i3c_master_bus_cleanup(master);
2553         device_unregister(&master->dev);
2554
2555         return 0;
2556 }
2557 EXPORT_SYMBOL_GPL(i3c_master_unregister);
2558
2559 int i3c_dev_do_priv_xfers_locked(struct i3c_dev_desc *dev,
2560                                  struct i3c_priv_xfer *xfers,
2561                                  int nxfers)
2562 {
2563         struct i3c_master_controller *master;
2564
2565         if (!dev)
2566                 return -ENOENT;
2567
2568         master = i3c_dev_get_master(dev);
2569         if (!master || !xfers)
2570                 return -EINVAL;
2571
2572         if (!master->ops->priv_xfers)
2573                 return -ENOTSUPP;
2574
2575         return master->ops->priv_xfers(dev, xfers, nxfers);
2576 }
2577
2578 int i3c_dev_disable_ibi_locked(struct i3c_dev_desc *dev)
2579 {
2580         struct i3c_master_controller *master;
2581         int ret;
2582
2583         if (!dev->ibi)
2584                 return -EINVAL;
2585
2586         master = i3c_dev_get_master(dev);
2587         ret = master->ops->disable_ibi(dev);
2588         if (ret)
2589                 return ret;
2590
2591         reinit_completion(&dev->ibi->all_ibis_handled);
2592         if (atomic_read(&dev->ibi->pending_ibis))
2593                 wait_for_completion(&dev->ibi->all_ibis_handled);
2594
2595         dev->ibi->enabled = false;
2596
2597         return 0;
2598 }
2599
2600 int i3c_dev_enable_ibi_locked(struct i3c_dev_desc *dev)
2601 {
2602         struct i3c_master_controller *master = i3c_dev_get_master(dev);
2603         int ret;
2604
2605         if (!dev->ibi)
2606                 return -EINVAL;
2607
2608         ret = master->ops->enable_ibi(dev);
2609         if (!ret)
2610                 dev->ibi->enabled = true;
2611
2612         return ret;
2613 }
2614
2615 int i3c_dev_request_ibi_locked(struct i3c_dev_desc *dev,
2616                                const struct i3c_ibi_setup *req)
2617 {
2618         struct i3c_master_controller *master = i3c_dev_get_master(dev);
2619         struct i3c_device_ibi_info *ibi;
2620         int ret;
2621
2622         if (!master->ops->request_ibi)
2623                 return -ENOTSUPP;
2624
2625         if (dev->ibi)
2626                 return -EBUSY;
2627
2628         ibi = kzalloc(sizeof(*ibi), GFP_KERNEL);
2629         if (!ibi)
2630                 return -ENOMEM;
2631
2632         atomic_set(&ibi->pending_ibis, 0);
2633         init_completion(&ibi->all_ibis_handled);
2634         ibi->handler = req->handler;
2635         ibi->max_payload_len = req->max_payload_len;
2636         ibi->num_slots = req->num_slots;
2637
2638         dev->ibi = ibi;
2639         ret = master->ops->request_ibi(dev, req);
2640         if (ret) {
2641                 kfree(ibi);
2642                 dev->ibi = NULL;
2643         }
2644
2645         return ret;
2646 }
2647
2648 void i3c_dev_free_ibi_locked(struct i3c_dev_desc *dev)
2649 {
2650         struct i3c_master_controller *master = i3c_dev_get_master(dev);
2651
2652         if (!dev->ibi)
2653                 return;
2654
2655         if (WARN_ON(dev->ibi->enabled))
2656                 WARN_ON(i3c_dev_disable_ibi_locked(dev));
2657
2658         master->ops->free_ibi(dev);
2659         kfree(dev->ibi);
2660         dev->ibi = NULL;
2661 }
2662
2663 static int __init i3c_init(void)
2664 {
2665         return bus_register(&i3c_bus_type);
2666 }
2667 subsys_initcall(i3c_init);
2668
2669 static void __exit i3c_exit(void)
2670 {
2671         idr_destroy(&i3c_bus_idr);
2672         bus_unregister(&i3c_bus_type);
2673 }
2674 module_exit(i3c_exit);
2675
2676 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@bootlin.com>");
2677 MODULE_DESCRIPTION("I3C core");
2678 MODULE_LICENSE("GPL v2");