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#ifndef I3C_MASTER_H
9#define I3C_MASTER_H
10
11#include <asm/bitsperlong.h>
12
13#include <linux/bitops.h>
14#include <linux/i2c.h>
15#include <linux/i3c/ccc.h>
16#include <linux/i3c/device.h>
17#include <linux/rwsem.h>
18#include <linux/spinlock.h>
19#include <linux/workqueue.h>
20
21#define I3C_HOT_JOIN_ADDR 0x2
22#define I3C_BROADCAST_ADDR 0x7e
23#define I3C_MAX_ADDR GENMASK(6, 0)
24
25struct i2c_client;
26
27/* notifier actions. notifier call data is the struct i3c_bus */
28enum {
29 I3C_NOTIFY_BUS_ADD,
30 I3C_NOTIFY_BUS_REMOVE,
31};
32
33struct i3c_master_controller;
34struct i3c_bus;
35struct i3c_device;
36
37/**
38 * struct i3c_i2c_dev_desc - Common part of the I3C/I2C device descriptor
39 * @node: node element used to insert the slot into the I2C or I3C device
40 * list
41 * @master: I3C master that instantiated this device. Will be used to do
42 * I2C/I3C transfers
43 * @master_priv: master private data assigned to the device. Can be used to
44 * add master specific information
45 *
46 * This structure is describing common I3C/I2C dev information.
47 */
48struct i3c_i2c_dev_desc {
49 struct list_head node;
50 struct i3c_master_controller *master;
51 void *master_priv;
52};
53
54#define I3C_LVR_I2C_INDEX_MASK GENMASK(7, 5)
55#define I3C_LVR_I2C_INDEX(x) ((x) << 5)
56#define I3C_LVR_I2C_FM_MODE BIT(4)
57
58#define I2C_MAX_ADDR GENMASK(6, 0)
59
60/**
61 * struct i2c_dev_boardinfo - I2C device board information
62 * @node: used to insert the boardinfo object in the I2C boardinfo list
63 * @base: regular I2C board information
64 * @lvr: LVR (Legacy Virtual Register) needed by the I3C core to know about
65 * the I2C device limitations
66 *
67 * This structure is used to attach board-level information to an I2C device.
68 * Each I2C device connected on the I3C bus should have one.
69 */
70struct i2c_dev_boardinfo {
71 struct list_head node;
72 struct i2c_board_info base;
73 u8 lvr;
74};
75
76/**
77 * struct i2c_dev_desc - I2C device descriptor
78 * @common: common part of the I2C device descriptor
79 * @boardinfo: pointer to the boardinfo attached to this I2C device
80 * @dev: I2C device object registered to the I2C framework
81 * @addr: I2C device address
82 * @lvr: LVR (Legacy Virtual Register) needed by the I3C core to know about
83 * the I2C device limitations
84 *
85 * Each I2C device connected on the bus will have an i2c_dev_desc.
86 * This object is created by the core and later attached to the controller
87 * using &struct_i3c_master_controller->ops->attach_i2c_dev().
88 *
89 * &struct_i2c_dev_desc is the internal representation of an I2C device
90 * connected on an I3C bus. This object is also passed to all
91 * &struct_i3c_master_controller_ops hooks.
92 */
93struct i2c_dev_desc {
94 struct i3c_i2c_dev_desc common;
95 struct i2c_client *dev;
96 u16 addr;
97 u8 lvr;
98};
99
100/**
101 * struct i3c_ibi_slot - I3C IBI (In-Band Interrupt) slot
102 * @work: work associated to this slot. The IBI handler will be called from
103 * there
104 * @dev: the I3C device that has generated this IBI
105 * @len: length of the payload associated to this IBI
106 * @data: payload buffer
107 *
108 * An IBI slot is an object pre-allocated by the controller and used when an
109 * IBI comes in.
110 * Every time an IBI comes in, the I3C master driver should find a free IBI
111 * slot in its IBI slot pool, retrieve the IBI payload and queue the IBI using
112 * i3c_master_queue_ibi().
113 *
114 * How IBI slots are allocated is left to the I3C master driver, though, for
115 * simple kmalloc-based allocation, the generic IBI slot pool can be used.
116 */
117struct i3c_ibi_slot {
118 struct work_struct work;
119 struct i3c_dev_desc *dev;
120 unsigned int len;
121 void *data;
122};
123
124/**
125 * struct i3c_device_ibi_info - IBI information attached to a specific device
126 * @all_ibis_handled: used to be informed when no more IBIs are waiting to be
127 * processed. Used by i3c_device_disable_ibi() to wait for
128 * all IBIs to be dequeued
129 * @pending_ibis: count the number of pending IBIs. Each pending IBI has its
130 * work element queued to the controller workqueue
131 * @max_payload_len: maximum payload length for an IBI coming from this device.
132 * this value is specified when calling
133 * i3c_device_request_ibi() and should not change at run
134 * time. All messages IBIs exceeding this limit should be
135 * rejected by the master
136 * @num_slots: number of IBI slots reserved for this device
137 * @enabled: reflect the IBI status
138 * @wq: workqueue used to execute IBI handlers.
139 * @handler: IBI handler specified at i3c_device_request_ibi() call time. This
140 * handler will be called from the controller workqueue, and as such
141 * is allowed to sleep (though it is recommended to process the IBI
142 * as fast as possible to not stall processing of other IBIs queued
143 * on the same workqueue).
144 * New I3C messages can be sent from the IBI handler
145 *
146 * The &struct_i3c_device_ibi_info object is allocated when
147 * i3c_device_request_ibi() is called and attached to a specific device. This
148 * object is here to manage IBIs coming from a specific I3C device.
149 *
150 * Note that this structure is the generic view of the IBI management
151 * infrastructure. I3C master drivers may have their own internal
152 * representation which they can associate to the device using
153 * controller-private data.
154 */
155struct i3c_device_ibi_info {
156 struct completion all_ibis_handled;
157 atomic_t pending_ibis;
158 unsigned int max_payload_len;
159 unsigned int num_slots;
160 unsigned int enabled;
161 struct workqueue_struct *wq;
162 void (*handler)(struct i3c_device *dev,
163 const struct i3c_ibi_payload *payload);
164};
165
166/**
167 * struct i3c_dev_boardinfo - I3C device board information
168 * @node: used to insert the boardinfo object in the I3C boardinfo list
169 * @init_dyn_addr: initial dynamic address requested by the FW. We provide no
170 * guarantee that the device will end up using this address,
171 * but try our best to assign this specific address to the
172 * device
173 * @static_addr: static address the I3C device listen on before it's been
174 * assigned a dynamic address by the master. Will be used during
175 * bus initialization to assign it a specific dynamic address
176 * before starting DAA (Dynamic Address Assignment)
177 * @pid: I3C Provisioned ID exposed by the device. This is a unique identifier
178 * that may be used to attach boardinfo to i3c_dev_desc when the device
179 * does not have a static address
180 * @of_node: optional DT node in case the device has been described in the DT
181 *
182 * This structure is used to attach board-level information to an I3C device.
183 * Not all I3C devices connected on the bus will have a boardinfo. It's only
184 * needed if you want to attach extra resources to a device or assign it a
185 * specific dynamic address.
186 */
187struct i3c_dev_boardinfo {
188 struct list_head node;
189 u8 init_dyn_addr;
190 u8 static_addr;
191 u64 pid;
192 struct device_node *of_node;
193};
194
195/**
196 * struct i3c_dev_desc - I3C device descriptor
197 * @common: common part of the I3C device descriptor
198 * @info: I3C device information. Will be automatically filled when you create
199 * your device with i3c_master_add_i3c_dev_locked()
200 * @ibi_lock: lock used to protect the &struct_i3c_device->ibi
201 * @ibi: IBI info attached to a device. Should be NULL until
202 * i3c_device_request_ibi() is called
203 * @dev: pointer to the I3C device object exposed to I3C device drivers. This
204 * should never be accessed from I3C master controller drivers. Only core
205 * code should manipulate it in when updating the dev <-> desc link or
206 * when propagating IBI events to the driver
207 * @boardinfo: pointer to the boardinfo attached to this I3C device
208 *
209 * Internal representation of an I3C device. This object is only used by the
210 * core and passed to I3C master controller drivers when they're requested to
211 * do some operations on the device.
212 * The core maintains the link between the internal I3C dev descriptor and the
213 * object exposed to the I3C device drivers (&struct_i3c_device).
214 */
215struct i3c_dev_desc {
216 struct i3c_i2c_dev_desc common;
217 struct i3c_device_info info;
218 struct mutex ibi_lock;
219 struct i3c_device_ibi_info *ibi;
220 struct i3c_device *dev;
221 const struct i3c_dev_boardinfo *boardinfo;
222};
223
224/**
225 * struct i3c_device - I3C device object
226 * @dev: device object to register the I3C dev to the device model
227 * @desc: pointer to an i3c device descriptor object. This link is updated
228 * every time the I3C device is rediscovered with a different dynamic
229 * address assigned
230 * @bus: I3C bus this device is attached to
231 *
232 * I3C device object exposed to I3C device drivers. The takes care of linking
233 * this object to the relevant &struct_i3c_dev_desc one.
234 * All I3C devs on the I3C bus are represented, including I3C masters. For each
235 * of them, we have an instance of &struct i3c_device.
236 */
237struct i3c_device {
238 struct device dev;
239 struct i3c_dev_desc *desc;
240 struct i3c_bus *bus;
241};
242
243/*
244 * The I3C specification says the maximum number of devices connected on the
245 * bus is 11, but this number depends on external parameters like trace length,
246 * capacitive load per Device, and the types of Devices present on the Bus.
247 * I3C master can also have limitations, so this number is just here as a
248 * reference and should be adjusted on a per-controller/per-board basis.
249 */
250#define I3C_BUS_MAX_DEVS 11
251
252#define I3C_BUS_MAX_I3C_SCL_RATE 12900000
253#define I3C_BUS_TYP_I3C_SCL_RATE 12500000
254#define I3C_BUS_I2C_FM_PLUS_SCL_RATE 1000000
255#define I3C_BUS_I2C_FM_SCL_RATE 400000
256#define I3C_BUS_TLOW_OD_MIN_NS 200
257
258/**
259 * enum i3c_bus_mode - I3C bus mode
260 * @I3C_BUS_MODE_PURE: only I3C devices are connected to the bus. No limitation
261 * expected
262 * @I3C_BUS_MODE_MIXED_FAST: I2C devices with 50ns spike filter are present on
263 * the bus. The only impact in this mode is that the
264 * high SCL pulse has to stay below 50ns to trick I2C
265 * devices when transmitting I3C frames
266 * @I3C_BUS_MODE_MIXED_LIMITED: I2C devices without 50ns spike filter are
267 * present on the bus. However they allow
268 * compliance up to the maximum SDR SCL clock
269 * frequency.
270 * @I3C_BUS_MODE_MIXED_SLOW: I2C devices without 50ns spike filter are present
271 * on the bus
272 */
273enum i3c_bus_mode {
274 I3C_BUS_MODE_PURE,
275 I3C_BUS_MODE_MIXED_FAST,
276 I3C_BUS_MODE_MIXED_LIMITED,
277 I3C_BUS_MODE_MIXED_SLOW,
278};
279
280/**
281 * enum i3c_addr_slot_status - I3C address slot status
282 * @I3C_ADDR_SLOT_FREE: address is free
283 * @I3C_ADDR_SLOT_RSVD: address is reserved
284 * @I3C_ADDR_SLOT_I2C_DEV: address is assigned to an I2C device
285 * @I3C_ADDR_SLOT_I3C_DEV: address is assigned to an I3C device
286 * @I3C_ADDR_SLOT_STATUS_MASK: address slot mask
287 *
288 * On an I3C bus, addresses are assigned dynamically, and we need to know which
289 * addresses are free to use and which ones are already assigned.
290 *
291 * Addresses marked as reserved are those reserved by the I3C protocol
292 * (broadcast address, ...).
293 */
294enum i3c_addr_slot_status {
295 I3C_ADDR_SLOT_FREE,
296 I3C_ADDR_SLOT_RSVD,
297 I3C_ADDR_SLOT_I2C_DEV,
298 I3C_ADDR_SLOT_I3C_DEV,
299 I3C_ADDR_SLOT_STATUS_MASK = 3,
300};
301
302/**
303 * struct i3c_bus - I3C bus object
304 * @cur_master: I3C master currently driving the bus. Since I3C is multi-master
305 * this can change over the time. Will be used to let a master
306 * know whether it needs to request bus ownership before sending
307 * a frame or not
308 * @id: bus ID. Assigned by the framework when register the bus
309 * @addrslots: a bitmap with 2-bits per-slot to encode the address status and
310 * ease the DAA (Dynamic Address Assignment) procedure (see
311 * &enum i3c_addr_slot_status)
312 * @mode: bus mode (see &enum i3c_bus_mode)
313 * @scl_rate.i3c: maximum rate for the clock signal when doing I3C SDR/priv
314 * transfers
315 * @scl_rate.i2c: maximum rate for the clock signal when doing I2C transfers
316 * @scl_rate: SCL signal rate for I3C and I2C mode
317 * @devs.i3c: contains a list of I3C device descriptors representing I3C
318 * devices connected on the bus and successfully attached to the
319 * I3C master
320 * @devs.i2c: contains a list of I2C device descriptors representing I2C
321 * devices connected on the bus and successfully attached to the
322 * I3C master
323 * @devs: 2 lists containing all I3C/I2C devices connected to the bus
324 * @lock: read/write lock on the bus. This is needed to protect against
325 * operations that have an impact on the whole bus and the devices
326 * connected to it. For example, when asking slaves to drop their
327 * dynamic address (RSTDAA CCC), we need to make sure no one is trying
328 * to send I3C frames to these devices.
329 * Note that this lock does not protect against concurrency between
330 * devices: several drivers can send different I3C/I2C frames through
331 * the same master in parallel. This is the responsibility of the
332 * master to guarantee that frames are actually sent sequentially and
333 * not interlaced
334 *
335 * The I3C bus is represented with its own object and not implicitly described
336 * by the I3C master to cope with the multi-master functionality, where one bus
337 * can be shared amongst several masters, each of them requesting bus ownership
338 * when they need to.
339 */
340struct i3c_bus {
341 struct i3c_dev_desc *cur_master;
342 int id;
343 unsigned long addrslots[((I2C_MAX_ADDR + 1) * 2) / BITS_PER_LONG];
344 enum i3c_bus_mode mode;
345 struct {
346 unsigned long i3c;
347 unsigned long i2c;
348 } scl_rate;
349 struct {
350 struct list_head i3c;
351 struct list_head i2c;
352 } devs;
353 struct rw_semaphore lock;
354};
355
356/**
357 * struct i3c_master_controller_ops - I3C master methods
358 * @bus_init: hook responsible for the I3C bus initialization. You should at
359 * least call master_set_info() from there and set the bus mode.
360 * You can also put controller specific initialization in there.
361 * This method is mandatory.
362 * @bus_cleanup: cleanup everything done in
363 * &i3c_master_controller_ops->bus_init().
364 * This method is optional.
365 * @attach_i3c_dev: called every time an I3C device is attached to the bus. It
366 * can be after a DAA or when a device is statically declared
367 * by the FW, in which case it will only have a static address
368 * and the dynamic address will be 0.
369 * When this function is called, device information have not
370 * been retrieved yet.
371 * This is a good place to attach master controller specific
372 * data to I3C devices.
373 * This method is optional.
374 * @reattach_i3c_dev: called every time an I3C device has its addressed
375 * changed. It can be because the device has been powered
376 * down and has lost its address, or it can happen when a
377 * device had a static address and has been assigned a
378 * dynamic address with SETDASA.
379 * This method is optional.
380 * @detach_i3c_dev: called when an I3C device is detached from the bus. Usually
381 * happens when the master device is unregistered.
382 * This method is optional.
383 * @do_daa: do a DAA (Dynamic Address Assignment) procedure. This is procedure
384 * should send an ENTDAA CCC command and then add all devices
385 * discovered sure the DAA using i3c_master_add_i3c_dev_locked().
386 * Add devices added with i3c_master_add_i3c_dev_locked() will then be
387 * attached or re-attached to the controller.
388 * This method is mandatory.
389 * @supports_ccc_cmd: should return true if the CCC command is supported, false
390 * otherwise.
391 * This method is optional, if not provided the core assumes
392 * all CCC commands are supported.
393 * @send_ccc_cmd: send a CCC command
394 * This method is mandatory.
395 * @priv_xfers: do one or several private I3C SDR transfers
396 * This method is mandatory.
397 * @attach_i2c_dev: called every time an I2C device is attached to the bus.
398 * This is a good place to attach master controller specific
399 * data to I2C devices.
400 * This method is optional.
401 * @detach_i2c_dev: called when an I2C device is detached from the bus. Usually
402 * happens when the master device is unregistered.
403 * This method is optional.
404 * @i2c_xfers: do one or several I2C transfers. Note that, unlike i3c
405 * transfers, the core does not guarantee that buffers attached to
406 * the transfers are DMA-safe. If drivers want to have DMA-safe
407 * buffers, they should use the i2c_get_dma_safe_msg_buf()
408 * and i2c_put_dma_safe_msg_buf() helpers provided by the I2C
409 * framework.
410 * This method is mandatory.
411 * @request_ibi: attach an IBI handler to an I3C device. This implies defining
412 * an IBI handler and the constraints of the IBI (maximum payload
413 * length and number of pre-allocated slots).
414 * Some controllers support less IBI-capable devices than regular
415 * devices, so this method might return -%EBUSY if there's no
416 * more space for an extra IBI registration
417 * This method is optional.
418 * @free_ibi: free an IBI previously requested with ->request_ibi(). The IBI
419 * should have been disabled with ->disable_irq() prior to that
420 * This method is mandatory only if ->request_ibi is not NULL.
421 * @enable_ibi: enable the IBI. Only valid if ->request_ibi() has been called
422 * prior to ->enable_ibi(). The controller should first enable
423 * the IBI on the controller end (for example, unmask the hardware
424 * IRQ) and then send the ENEC CCC command (with the IBI flag set)
425 * to the I3C device.
426 * This method is mandatory only if ->request_ibi is not NULL.
427 * @disable_ibi: disable an IBI. First send the DISEC CCC command with the IBI
428 * flag set and then deactivate the hardware IRQ on the
429 * controller end.
430 * This method is mandatory only if ->request_ibi is not NULL.
431 * @recycle_ibi_slot: recycle an IBI slot. Called every time an IBI has been
432 * processed by its handler. The IBI slot should be put back
433 * in the IBI slot pool so that the controller can re-use it
434 * for a future IBI
435 * This method is mandatory only if ->request_ibi is not
436 * NULL.
437 */
438struct i3c_master_controller_ops {
439 int (*bus_init)(struct i3c_master_controller *master);
440 void (*bus_cleanup)(struct i3c_master_controller *master);
441 int (*attach_i3c_dev)(struct i3c_dev_desc *dev);
442 int (*reattach_i3c_dev)(struct i3c_dev_desc *dev, u8 old_dyn_addr);
443 void (*detach_i3c_dev)(struct i3c_dev_desc *dev);
444 int (*do_daa)(struct i3c_master_controller *master);
445 bool (*supports_ccc_cmd)(struct i3c_master_controller *master,
446 const struct i3c_ccc_cmd *cmd);
447 int (*send_ccc_cmd)(struct i3c_master_controller *master,
448 struct i3c_ccc_cmd *cmd);
449 int (*priv_xfers)(struct i3c_dev_desc *dev,
450 struct i3c_priv_xfer *xfers,
451 int nxfers);
452 int (*attach_i2c_dev)(struct i2c_dev_desc *dev);
453 void (*detach_i2c_dev)(struct i2c_dev_desc *dev);
454 int (*i2c_xfers)(struct i2c_dev_desc *dev,
455 const struct i2c_msg *xfers, int nxfers);
456 int (*request_ibi)(struct i3c_dev_desc *dev,
457 const struct i3c_ibi_setup *req);
458 void (*free_ibi)(struct i3c_dev_desc *dev);
459 int (*enable_ibi)(struct i3c_dev_desc *dev);
460 int (*disable_ibi)(struct i3c_dev_desc *dev);
461 void (*recycle_ibi_slot)(struct i3c_dev_desc *dev,
462 struct i3c_ibi_slot *slot);
463};
464
465/**
466 * struct i3c_master_controller - I3C master controller object
467 * @dev: device to be registered to the device-model
468 * @this: an I3C device object representing this master. This device will be
469 * added to the list of I3C devs available on the bus
470 * @i2c: I2C adapter used for backward compatibility. This adapter is
471 * registered to the I2C subsystem to be as transparent as possible to
472 * existing I2C drivers
473 * @ops: master operations. See &struct i3c_master_controller_ops
474 * @secondary: true if the master is a secondary master
475 * @init_done: true when the bus initialization is done
476 * @boardinfo.i3c: list of I3C boardinfo objects
477 * @boardinfo.i2c: list of I2C boardinfo objects
478 * @boardinfo: board-level information attached to devices connected on the bus
479 * @bus: I3C bus exposed by this master
480 * @wq: workqueue which can be used by master
481 * drivers if they need to postpone operations that need to take place
482 * in a thread context. Typical examples are Hot Join processing which
483 * requires taking the bus lock in maintenance, which in turn, can only
484 * be done from a sleep-able context
485 *
486 * A &struct i3c_master_controller has to be registered to the I3C subsystem
487 * through i3c_master_register(). None of &struct i3c_master_controller fields
488 * should be set manually, just pass appropriate values to
489 * i3c_master_register().
490 */
491struct i3c_master_controller {
492 struct device dev;
493 struct i3c_dev_desc *this;
494 struct i2c_adapter i2c;
495 const struct i3c_master_controller_ops *ops;
496 unsigned int secondary : 1;
497 unsigned int init_done : 1;
498 struct {
499 struct list_head i3c;
500 struct list_head i2c;
501 } boardinfo;
502 struct i3c_bus bus;
503 struct workqueue_struct *wq;
504};
505
506/**
507 * i3c_bus_for_each_i2cdev() - iterate over all I2C devices present on the bus
508 * @bus: the I3C bus
509 * @dev: an I2C device descriptor pointer updated to point to the current slot
510 * at each iteration of the loop
511 *
512 * Iterate over all I2C devs present on the bus.
513 */
514#define i3c_bus_for_each_i2cdev(bus, dev) \
515 list_for_each_entry(dev, &(bus)->devs.i2c, common.node)
516
517/**
518 * i3c_bus_for_each_i3cdev() - iterate over all I3C devices present on the bus
519 * @bus: the I3C bus
520 * @dev: and I3C device descriptor pointer updated to point to the current slot
521 * at each iteration of the loop
522 *
523 * Iterate over all I3C devs present on the bus.
524 */
525#define i3c_bus_for_each_i3cdev(bus, dev) \
526 list_for_each_entry(dev, &(bus)->devs.i3c, common.node)
527
528int i3c_master_do_i2c_xfers(struct i3c_master_controller *master,
529 const struct i2c_msg *xfers,
530 int nxfers);
531
532int i3c_master_disec_locked(struct i3c_master_controller *master, u8 addr,
533 u8 evts);
534int i3c_master_enec_locked(struct i3c_master_controller *master, u8 addr,
535 u8 evts);
536int i3c_master_entdaa_locked(struct i3c_master_controller *master);
537int i3c_master_defslvs_locked(struct i3c_master_controller *master);
538
539int i3c_master_get_free_addr(struct i3c_master_controller *master,
540 u8 start_addr);
541
542int i3c_master_add_i3c_dev_locked(struct i3c_master_controller *master,
543 u8 addr);
544int i3c_master_do_daa(struct i3c_master_controller *master);
545
546int i3c_master_set_info(struct i3c_master_controller *master,
547 const struct i3c_device_info *info);
548
549int i3c_master_register(struct i3c_master_controller *master,
550 struct device *parent,
551 const struct i3c_master_controller_ops *ops,
552 bool secondary);
553void i3c_master_unregister(struct i3c_master_controller *master);
554
555/**
556 * i3c_dev_get_master_data() - get master private data attached to an I3C
557 * device descriptor
558 * @dev: the I3C device descriptor to get private data from
559 *
560 * Return: the private data previously attached with i3c_dev_set_master_data()
561 * or NULL if no data has been attached to the device.
562 */
563static inline void *i3c_dev_get_master_data(const struct i3c_dev_desc *dev)
564{
565 return dev->common.master_priv;
566}
567
568/**
569 * i3c_dev_set_master_data() - attach master private data to an I3C device
570 * descriptor
571 * @dev: the I3C device descriptor to attach private data to
572 * @data: private data
573 *
574 * This functions allows a master controller to attach per-device private data
575 * which can then be retrieved with i3c_dev_get_master_data().
576 */
577static inline void i3c_dev_set_master_data(struct i3c_dev_desc *dev,
578 void *data)
579{
580 dev->common.master_priv = data;
581}
582
583/**
584 * i2c_dev_get_master_data() - get master private data attached to an I2C
585 * device descriptor
586 * @dev: the I2C device descriptor to get private data from
587 *
588 * Return: the private data previously attached with i2c_dev_set_master_data()
589 * or NULL if no data has been attached to the device.
590 */
591static inline void *i2c_dev_get_master_data(const struct i2c_dev_desc *dev)
592{
593 return dev->common.master_priv;
594}
595
596/**
597 * i2c_dev_set_master_data() - attach master private data to an I2C device
598 * descriptor
599 * @dev: the I2C device descriptor to attach private data to
600 * @data: private data
601 *
602 * This functions allows a master controller to attach per-device private data
603 * which can then be retrieved with i2c_device_get_master_data().
604 */
605static inline void i2c_dev_set_master_data(struct i2c_dev_desc *dev,
606 void *data)
607{
608 dev->common.master_priv = data;
609}
610
611/**
612 * i3c_dev_get_master() - get master used to communicate with a device
613 * @dev: I3C dev
614 *
615 * Return: the master controller driving @dev
616 */
617static inline struct i3c_master_controller *
618i3c_dev_get_master(struct i3c_dev_desc *dev)
619{
620 return dev->common.master;
621}
622
623/**
624 * i2c_dev_get_master() - get master used to communicate with a device
625 * @dev: I2C dev
626 *
627 * Return: the master controller driving @dev
628 */
629static inline struct i3c_master_controller *
630i2c_dev_get_master(struct i2c_dev_desc *dev)
631{
632 return dev->common.master;
633}
634
635/**
636 * i3c_master_get_bus() - get the bus attached to a master
637 * @master: master object
638 *
639 * Return: the I3C bus @master is connected to
640 */
641static inline struct i3c_bus *
642i3c_master_get_bus(struct i3c_master_controller *master)
643{
644 return &master->bus;
645}
646
647struct i3c_generic_ibi_pool;
648
649struct i3c_generic_ibi_pool *
650i3c_generic_ibi_alloc_pool(struct i3c_dev_desc *dev,
651 const struct i3c_ibi_setup *req);
652void i3c_generic_ibi_free_pool(struct i3c_generic_ibi_pool *pool);
653
654struct i3c_ibi_slot *
655i3c_generic_ibi_get_free_slot(struct i3c_generic_ibi_pool *pool);
656void i3c_generic_ibi_recycle_slot(struct i3c_generic_ibi_pool *pool,
657 struct i3c_ibi_slot *slot);
658
659void i3c_master_queue_ibi(struct i3c_dev_desc *dev, struct i3c_ibi_slot *slot);
660
661struct i3c_ibi_slot *i3c_master_get_free_ibi_slot(struct i3c_dev_desc *dev);
662
663void i3c_for_each_bus_locked(int (*fn)(struct i3c_bus *bus, void *data),
664 void *data);
665int i3c_register_notifier(struct notifier_block *nb);
666int i3c_unregister_notifier(struct notifier_block *nb);
667
668#endif /* I3C_MASTER_H */
669

source code of linux/include/linux/i3c/master.h