Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0-or-later */
2 : /*
3 : * i2c.h - definitions for the Linux i2c bus interface
4 : * Copyright (C) 1995-2000 Simon G. Vogl
5 : * Copyright (C) 2013-2019 Wolfram Sang <wsa@kernel.org>
6 : *
7 : * With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
8 : * Frodo Looijaard <frodol@dds.nl>
9 : */
10 : #ifndef _LINUX_I2C_H
11 : #define _LINUX_I2C_H
12 :
13 : #include <linux/acpi.h> /* for acpi_handle */
14 : #include <linux/bits.h>
15 : #include <linux/mod_devicetable.h>
16 : #include <linux/device.h> /* for struct device */
17 : #include <linux/sched.h> /* for completion */
18 : #include <linux/mutex.h>
19 : #include <linux/regulator/consumer.h>
20 : #include <linux/rtmutex.h>
21 : #include <linux/irqdomain.h> /* for Host Notify IRQ */
22 : #include <linux/of.h> /* for struct device_node */
23 : #include <linux/swab.h> /* for swab16 */
24 : #include <uapi/linux/i2c.h>
25 :
26 : extern struct bus_type i2c_bus_type;
27 : extern struct device_type i2c_adapter_type;
28 : extern struct device_type i2c_client_type;
29 :
30 : /* --- General options ------------------------------------------------ */
31 :
32 : struct i2c_msg;
33 : struct i2c_algorithm;
34 : struct i2c_adapter;
35 : struct i2c_client;
36 : struct i2c_driver;
37 : struct i2c_device_identity;
38 : union i2c_smbus_data;
39 : struct i2c_board_info;
40 : enum i2c_slave_event;
41 : typedef int (*i2c_slave_cb_t)(struct i2c_client *client,
42 : enum i2c_slave_event event, u8 *val);
43 :
44 : /* I2C Frequency Modes */
45 : #define I2C_MAX_STANDARD_MODE_FREQ 100000
46 : #define I2C_MAX_FAST_MODE_FREQ 400000
47 : #define I2C_MAX_FAST_MODE_PLUS_FREQ 1000000
48 : #define I2C_MAX_TURBO_MODE_FREQ 1400000
49 : #define I2C_MAX_HIGH_SPEED_MODE_FREQ 3400000
50 : #define I2C_MAX_ULTRA_FAST_MODE_FREQ 5000000
51 :
52 : struct module;
53 : struct property_entry;
54 :
55 : #if IS_ENABLED(CONFIG_I2C)
56 : /* Return the Frequency mode string based on the bus frequency */
57 : const char *i2c_freq_mode_string(u32 bus_freq_hz);
58 :
59 : /*
60 : * The master routines are the ones normally used to transmit data to devices
61 : * on a bus (or read from them). Apart from two basic transfer functions to
62 : * transmit one message at a time, a more complex version can be used to
63 : * transmit an arbitrary number of messages without interruption.
64 : * @count must be less than 64k since msg.len is u16.
65 : */
66 : int i2c_transfer_buffer_flags(const struct i2c_client *client,
67 : char *buf, int count, u16 flags);
68 :
69 : /**
70 : * i2c_master_recv - issue a single I2C message in master receive mode
71 : * @client: Handle to slave device
72 : * @buf: Where to store data read from slave
73 : * @count: How many bytes to read, must be less than 64k since msg.len is u16
74 : *
75 : * Returns negative errno, or else the number of bytes read.
76 : */
77 : static inline int i2c_master_recv(const struct i2c_client *client,
78 : char *buf, int count)
79 : {
80 : return i2c_transfer_buffer_flags(client, buf, count, I2C_M_RD);
81 : };
82 :
83 : /**
84 : * i2c_master_recv_dmasafe - issue a single I2C message in master receive mode
85 : * using a DMA safe buffer
86 : * @client: Handle to slave device
87 : * @buf: Where to store data read from slave, must be safe to use with DMA
88 : * @count: How many bytes to read, must be less than 64k since msg.len is u16
89 : *
90 : * Returns negative errno, or else the number of bytes read.
91 : */
92 : static inline int i2c_master_recv_dmasafe(const struct i2c_client *client,
93 : char *buf, int count)
94 : {
95 : return i2c_transfer_buffer_flags(client, buf, count,
96 : I2C_M_RD | I2C_M_DMA_SAFE);
97 : };
98 :
99 : /**
100 : * i2c_master_send - issue a single I2C message in master transmit mode
101 : * @client: Handle to slave device
102 : * @buf: Data that will be written to the slave
103 : * @count: How many bytes to write, must be less than 64k since msg.len is u16
104 : *
105 : * Returns negative errno, or else the number of bytes written.
106 : */
107 : static inline int i2c_master_send(const struct i2c_client *client,
108 : const char *buf, int count)
109 : {
110 : return i2c_transfer_buffer_flags(client, (char *)buf, count, 0);
111 : };
112 :
113 : /**
114 : * i2c_master_send_dmasafe - issue a single I2C message in master transmit mode
115 : * using a DMA safe buffer
116 : * @client: Handle to slave device
117 : * @buf: Data that will be written to the slave, must be safe to use with DMA
118 : * @count: How many bytes to write, must be less than 64k since msg.len is u16
119 : *
120 : * Returns negative errno, or else the number of bytes written.
121 : */
122 : static inline int i2c_master_send_dmasafe(const struct i2c_client *client,
123 : const char *buf, int count)
124 : {
125 : return i2c_transfer_buffer_flags(client, (char *)buf, count,
126 : I2C_M_DMA_SAFE);
127 : };
128 :
129 : /* Transfer num messages.
130 : */
131 : int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);
132 : /* Unlocked flavor */
133 : int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);
134 :
135 : /* This is the very generalized SMBus access routine. You probably do not
136 : want to use this, though; one of the functions below may be much easier,
137 : and probably just as fast.
138 : Note that we use i2c_adapter here, because you do not need a specific
139 : smbus adapter to call this function. */
140 : s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
141 : unsigned short flags, char read_write, u8 command,
142 : int protocol, union i2c_smbus_data *data);
143 :
144 : /* Unlocked flavor */
145 : s32 __i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
146 : unsigned short flags, char read_write, u8 command,
147 : int protocol, union i2c_smbus_data *data);
148 :
149 : /* Now follow the 'nice' access routines. These also document the calling
150 : conventions of i2c_smbus_xfer. */
151 :
152 : u8 i2c_smbus_pec(u8 crc, u8 *p, size_t count);
153 : s32 i2c_smbus_read_byte(const struct i2c_client *client);
154 : s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value);
155 : s32 i2c_smbus_read_byte_data(const struct i2c_client *client, u8 command);
156 : s32 i2c_smbus_write_byte_data(const struct i2c_client *client,
157 : u8 command, u8 value);
158 : s32 i2c_smbus_read_word_data(const struct i2c_client *client, u8 command);
159 : s32 i2c_smbus_write_word_data(const struct i2c_client *client,
160 : u8 command, u16 value);
161 :
162 : static inline s32
163 : i2c_smbus_read_word_swapped(const struct i2c_client *client, u8 command)
164 : {
165 : s32 value = i2c_smbus_read_word_data(client, command);
166 :
167 : return (value < 0) ? value : swab16(value);
168 : }
169 :
170 : static inline s32
171 : i2c_smbus_write_word_swapped(const struct i2c_client *client,
172 : u8 command, u16 value)
173 : {
174 : return i2c_smbus_write_word_data(client, command, swab16(value));
175 : }
176 :
177 : /* Returns the number of read bytes */
178 : s32 i2c_smbus_read_block_data(const struct i2c_client *client,
179 : u8 command, u8 *values);
180 : s32 i2c_smbus_write_block_data(const struct i2c_client *client,
181 : u8 command, u8 length, const u8 *values);
182 : /* Returns the number of read bytes */
183 : s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client,
184 : u8 command, u8 length, u8 *values);
185 : s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client,
186 : u8 command, u8 length, const u8 *values);
187 : s32 i2c_smbus_read_i2c_block_data_or_emulated(const struct i2c_client *client,
188 : u8 command, u8 length,
189 : u8 *values);
190 : int i2c_get_device_id(const struct i2c_client *client,
191 : struct i2c_device_identity *id);
192 : const struct i2c_device_id *i2c_client_get_device_id(const struct i2c_client *client);
193 : #endif /* I2C */
194 :
195 : /**
196 : * struct i2c_device_identity - i2c client device identification
197 : * @manufacturer_id: 0 - 4095, database maintained by NXP
198 : * @part_id: 0 - 511, according to manufacturer
199 : * @die_revision: 0 - 7, according to manufacturer
200 : */
201 : struct i2c_device_identity {
202 : u16 manufacturer_id;
203 : #define I2C_DEVICE_ID_NXP_SEMICONDUCTORS 0
204 : #define I2C_DEVICE_ID_NXP_SEMICONDUCTORS_1 1
205 : #define I2C_DEVICE_ID_NXP_SEMICONDUCTORS_2 2
206 : #define I2C_DEVICE_ID_NXP_SEMICONDUCTORS_3 3
207 : #define I2C_DEVICE_ID_RAMTRON_INTERNATIONAL 4
208 : #define I2C_DEVICE_ID_ANALOG_DEVICES 5
209 : #define I2C_DEVICE_ID_STMICROELECTRONICS 6
210 : #define I2C_DEVICE_ID_ON_SEMICONDUCTOR 7
211 : #define I2C_DEVICE_ID_SPRINTEK_CORPORATION 8
212 : #define I2C_DEVICE_ID_ESPROS_PHOTONICS_AG 9
213 : #define I2C_DEVICE_ID_FUJITSU_SEMICONDUCTOR 10
214 : #define I2C_DEVICE_ID_FLIR 11
215 : #define I2C_DEVICE_ID_O2MICRO 12
216 : #define I2C_DEVICE_ID_ATMEL 13
217 : #define I2C_DEVICE_ID_NONE 0xffff
218 : u16 part_id;
219 : u8 die_revision;
220 : };
221 :
222 : enum i2c_alert_protocol {
223 : I2C_PROTOCOL_SMBUS_ALERT,
224 : I2C_PROTOCOL_SMBUS_HOST_NOTIFY,
225 : };
226 :
227 : /**
228 : * enum i2c_driver_flags - Flags for an I2C device driver
229 : *
230 : * @I2C_DRV_ACPI_WAIVE_D0_PROBE: Don't put the device in D0 state for probe
231 : */
232 : enum i2c_driver_flags {
233 : I2C_DRV_ACPI_WAIVE_D0_PROBE = BIT(0),
234 : };
235 :
236 : /**
237 : * struct i2c_driver - represent an I2C device driver
238 : * @class: What kind of i2c device we instantiate (for detect)
239 : * @probe: Callback for device binding - soon to be deprecated
240 : * @probe_new: New callback for device binding
241 : * @remove: Callback for device unbinding
242 : * @shutdown: Callback for device shutdown
243 : * @alert: Alert callback, for example for the SMBus alert protocol
244 : * @command: Callback for bus-wide signaling (optional)
245 : * @driver: Device driver model driver
246 : * @id_table: List of I2C devices supported by this driver
247 : * @detect: Callback for device detection
248 : * @address_list: The I2C addresses to probe (for detect)
249 : * @clients: List of detected clients we created (for i2c-core use only)
250 : * @flags: A bitmask of flags defined in &enum i2c_driver_flags
251 : *
252 : * The driver.owner field should be set to the module owner of this driver.
253 : * The driver.name field should be set to the name of this driver.
254 : *
255 : * For automatic device detection, both @detect and @address_list must
256 : * be defined. @class should also be set, otherwise only devices forced
257 : * with module parameters will be created. The detect function must
258 : * fill at least the name field of the i2c_board_info structure it is
259 : * handed upon successful detection, and possibly also the flags field.
260 : *
261 : * If @detect is missing, the driver will still work fine for enumerated
262 : * devices. Detected devices simply won't be supported. This is expected
263 : * for the many I2C/SMBus devices which can't be detected reliably, and
264 : * the ones which can always be enumerated in practice.
265 : *
266 : * The i2c_client structure which is handed to the @detect callback is
267 : * not a real i2c_client. It is initialized just enough so that you can
268 : * call i2c_smbus_read_byte_data and friends on it. Don't do anything
269 : * else with it. In particular, calling dev_dbg and friends on it is
270 : * not allowed.
271 : */
272 : struct i2c_driver {
273 : unsigned int class;
274 :
275 : /* Standard driver model interfaces */
276 : int (*probe)(struct i2c_client *client, const struct i2c_device_id *id);
277 : void (*remove)(struct i2c_client *client);
278 :
279 : /* New driver model interface to aid the seamless removal of the
280 : * current probe()'s, more commonly unused than used second parameter.
281 : */
282 : int (*probe_new)(struct i2c_client *client);
283 :
284 : /* driver model interfaces that don't relate to enumeration */
285 : void (*shutdown)(struct i2c_client *client);
286 :
287 : /* Alert callback, for example for the SMBus alert protocol.
288 : * The format and meaning of the data value depends on the protocol.
289 : * For the SMBus alert protocol, there is a single bit of data passed
290 : * as the alert response's low bit ("event flag").
291 : * For the SMBus Host Notify protocol, the data corresponds to the
292 : * 16-bit payload data reported by the slave device acting as master.
293 : */
294 : void (*alert)(struct i2c_client *client, enum i2c_alert_protocol protocol,
295 : unsigned int data);
296 :
297 : /* a ioctl like command that can be used to perform specific functions
298 : * with the device.
299 : */
300 : int (*command)(struct i2c_client *client, unsigned int cmd, void *arg);
301 :
302 : struct device_driver driver;
303 : const struct i2c_device_id *id_table;
304 :
305 : /* Device detection callback for automatic device creation */
306 : int (*detect)(struct i2c_client *client, struct i2c_board_info *info);
307 : const unsigned short *address_list;
308 : struct list_head clients;
309 :
310 : u32 flags;
311 : };
312 : #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
313 :
314 : /**
315 : * struct i2c_client - represent an I2C slave device
316 : * @flags: see I2C_CLIENT_* for possible flags
317 : * @addr: Address used on the I2C bus connected to the parent adapter.
318 : * @name: Indicates the type of the device, usually a chip name that's
319 : * generic enough to hide second-sourcing and compatible revisions.
320 : * @adapter: manages the bus segment hosting this I2C device
321 : * @dev: Driver model device node for the slave.
322 : * @init_irq: IRQ that was set at initialization
323 : * @irq: indicates the IRQ generated by this device (if any)
324 : * @detected: member of an i2c_driver.clients list or i2c-core's
325 : * userspace_devices list
326 : * @slave_cb: Callback when I2C slave mode of an adapter is used. The adapter
327 : * calls it to pass on slave events to the slave driver.
328 : * @devres_group_id: id of the devres group that will be created for resources
329 : * acquired when probing this device.
330 : *
331 : * An i2c_client identifies a single device (i.e. chip) connected to an
332 : * i2c bus. The behaviour exposed to Linux is defined by the driver
333 : * managing the device.
334 : */
335 : struct i2c_client {
336 : unsigned short flags; /* div., see below */
337 : #define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
338 : #define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */
339 : /* Must equal I2C_M_TEN below */
340 : #define I2C_CLIENT_SLAVE 0x20 /* we are the slave */
341 : #define I2C_CLIENT_HOST_NOTIFY 0x40 /* We want to use I2C host notify */
342 : #define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */
343 : #define I2C_CLIENT_SCCB 0x9000 /* Use Omnivision SCCB protocol */
344 : /* Must match I2C_M_STOP|IGNORE_NAK */
345 :
346 : unsigned short addr; /* chip address - NOTE: 7bit */
347 : /* addresses are stored in the */
348 : /* _LOWER_ 7 bits */
349 : char name[I2C_NAME_SIZE];
350 : struct i2c_adapter *adapter; /* the adapter we sit on */
351 : struct device dev; /* the device structure */
352 : int init_irq; /* irq set at initialization */
353 : int irq; /* irq issued by device */
354 : struct list_head detected;
355 : #if IS_ENABLED(CONFIG_I2C_SLAVE)
356 : i2c_slave_cb_t slave_cb; /* callback for slave mode */
357 : #endif
358 : void *devres_group_id; /* ID of probe devres group */
359 : };
360 : #define to_i2c_client(d) container_of(d, struct i2c_client, dev)
361 :
362 : struct i2c_adapter *i2c_verify_adapter(struct device *dev);
363 : const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id,
364 : const struct i2c_client *client);
365 :
366 : static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
367 : {
368 : struct device * const dev = kobj_to_dev(kobj);
369 : return to_i2c_client(dev);
370 : }
371 :
372 : static inline void *i2c_get_clientdata(const struct i2c_client *client)
373 : {
374 : return dev_get_drvdata(&client->dev);
375 : }
376 :
377 : static inline void i2c_set_clientdata(struct i2c_client *client, void *data)
378 : {
379 : dev_set_drvdata(&client->dev, data);
380 : }
381 :
382 : /* I2C slave support */
383 :
384 : #if IS_ENABLED(CONFIG_I2C_SLAVE)
385 : enum i2c_slave_event {
386 : I2C_SLAVE_READ_REQUESTED,
387 : I2C_SLAVE_WRITE_REQUESTED,
388 : I2C_SLAVE_READ_PROCESSED,
389 : I2C_SLAVE_WRITE_RECEIVED,
390 : I2C_SLAVE_STOP,
391 : };
392 :
393 : int i2c_slave_register(struct i2c_client *client, i2c_slave_cb_t slave_cb);
394 : int i2c_slave_unregister(struct i2c_client *client);
395 : bool i2c_detect_slave_mode(struct device *dev);
396 : int i2c_slave_event(struct i2c_client *client,
397 : enum i2c_slave_event event, u8 *val);
398 : #else
399 : static inline bool i2c_detect_slave_mode(struct device *dev) { return false; }
400 : #endif
401 :
402 : /**
403 : * struct i2c_board_info - template for device creation
404 : * @type: chip type, to initialize i2c_client.name
405 : * @flags: to initialize i2c_client.flags
406 : * @addr: stored in i2c_client.addr
407 : * @dev_name: Overrides the default <busnr>-<addr> dev_name if set
408 : * @platform_data: stored in i2c_client.dev.platform_data
409 : * @of_node: pointer to OpenFirmware device node
410 : * @fwnode: device node supplied by the platform firmware
411 : * @swnode: software node for the device
412 : * @resources: resources associated with the device
413 : * @num_resources: number of resources in the @resources array
414 : * @irq: stored in i2c_client.irq
415 : *
416 : * I2C doesn't actually support hardware probing, although controllers and
417 : * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's
418 : * a device at a given address. Drivers commonly need more information than
419 : * that, such as chip type, configuration, associated IRQ, and so on.
420 : *
421 : * i2c_board_info is used to build tables of information listing I2C devices
422 : * that are present. This information is used to grow the driver model tree.
423 : * For mainboards this is done statically using i2c_register_board_info();
424 : * bus numbers identify adapters that aren't yet available. For add-on boards,
425 : * i2c_new_client_device() does this dynamically with the adapter already known.
426 : */
427 : struct i2c_board_info {
428 : char type[I2C_NAME_SIZE];
429 : unsigned short flags;
430 : unsigned short addr;
431 : const char *dev_name;
432 : void *platform_data;
433 : struct device_node *of_node;
434 : struct fwnode_handle *fwnode;
435 : const struct software_node *swnode;
436 : const struct resource *resources;
437 : unsigned int num_resources;
438 : int irq;
439 : };
440 :
441 : /**
442 : * I2C_BOARD_INFO - macro used to list an i2c device and its address
443 : * @dev_type: identifies the device type
444 : * @dev_addr: the device's address on the bus.
445 : *
446 : * This macro initializes essential fields of a struct i2c_board_info,
447 : * declaring what has been provided on a particular board. Optional
448 : * fields (such as associated irq, or device-specific platform_data)
449 : * are provided using conventional syntax.
450 : */
451 : #define I2C_BOARD_INFO(dev_type, dev_addr) \
452 : .type = dev_type, .addr = (dev_addr)
453 :
454 :
455 : #if IS_ENABLED(CONFIG_I2C)
456 : /*
457 : * Add-on boards should register/unregister their devices; e.g. a board
458 : * with integrated I2C, a config eeprom, sensors, and a codec that's
459 : * used in conjunction with the primary hardware.
460 : */
461 : struct i2c_client *
462 : i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
463 :
464 : /* If you don't know the exact address of an I2C device, use this variant
465 : * instead, which can probe for device presence in a list of possible
466 : * addresses. The "probe" callback function is optional. If it is provided,
467 : * it must return 1 on successful probe, 0 otherwise. If it is not provided,
468 : * a default probing method is used.
469 : */
470 : struct i2c_client *
471 : i2c_new_scanned_device(struct i2c_adapter *adap,
472 : struct i2c_board_info *info,
473 : unsigned short const *addr_list,
474 : int (*probe)(struct i2c_adapter *adap, unsigned short addr));
475 :
476 : /* Common custom probe functions */
477 : int i2c_probe_func_quick_read(struct i2c_adapter *adap, unsigned short addr);
478 :
479 : struct i2c_client *
480 : i2c_new_dummy_device(struct i2c_adapter *adapter, u16 address);
481 :
482 : struct i2c_client *
483 : devm_i2c_new_dummy_device(struct device *dev, struct i2c_adapter *adap, u16 address);
484 :
485 : struct i2c_client *
486 : i2c_new_ancillary_device(struct i2c_client *client,
487 : const char *name,
488 : u16 default_addr);
489 :
490 : void i2c_unregister_device(struct i2c_client *client);
491 :
492 : struct i2c_client *i2c_verify_client(struct device *dev);
493 : #else
494 : static inline struct i2c_client *i2c_verify_client(struct device *dev)
495 : {
496 : return NULL;
497 : }
498 : #endif /* I2C */
499 :
500 : /* Mainboard arch_initcall() code should register all its I2C devices.
501 : * This is done at arch_initcall time, before declaring any i2c adapters.
502 : * Modules for add-on boards must use other calls.
503 : */
504 : #ifdef CONFIG_I2C_BOARDINFO
505 : int
506 : i2c_register_board_info(int busnum, struct i2c_board_info const *info,
507 : unsigned n);
508 : #else
509 : static inline int
510 : i2c_register_board_info(int busnum, struct i2c_board_info const *info,
511 : unsigned n)
512 : {
513 : return 0;
514 : }
515 : #endif /* I2C_BOARDINFO */
516 :
517 : /**
518 : * struct i2c_algorithm - represent I2C transfer method
519 : * @master_xfer: Issue a set of i2c transactions to the given I2C adapter
520 : * defined by the msgs array, with num messages available to transfer via
521 : * the adapter specified by adap.
522 : * @master_xfer_atomic: same as @master_xfer. Yet, only using atomic context
523 : * so e.g. PMICs can be accessed very late before shutdown. Optional.
524 : * @smbus_xfer: Issue smbus transactions to the given I2C adapter. If this
525 : * is not present, then the bus layer will try and convert the SMBus calls
526 : * into I2C transfers instead.
527 : * @smbus_xfer_atomic: same as @smbus_xfer. Yet, only using atomic context
528 : * so e.g. PMICs can be accessed very late before shutdown. Optional.
529 : * @functionality: Return the flags that this algorithm/adapter pair supports
530 : * from the ``I2C_FUNC_*`` flags.
531 : * @reg_slave: Register given client to I2C slave mode of this adapter
532 : * @unreg_slave: Unregister given client from I2C slave mode of this adapter
533 : *
534 : * The following structs are for those who like to implement new bus drivers:
535 : * i2c_algorithm is the interface to a class of hardware solutions which can
536 : * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
537 : * to name two of the most common.
538 : *
539 : * The return codes from the ``master_xfer{_atomic}`` fields should indicate the
540 : * type of error code that occurred during the transfer, as documented in the
541 : * Kernel Documentation file Documentation/i2c/fault-codes.rst. Otherwise, the
542 : * number of messages executed should be returned.
543 : */
544 : struct i2c_algorithm {
545 : /*
546 : * If an adapter algorithm can't do I2C-level access, set master_xfer
547 : * to NULL. If an adapter algorithm can do SMBus access, set
548 : * smbus_xfer. If set to NULL, the SMBus protocol is simulated
549 : * using common I2C messages.
550 : *
551 : * master_xfer should return the number of messages successfully
552 : * processed, or a negative value on error
553 : */
554 : int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs,
555 : int num);
556 : int (*master_xfer_atomic)(struct i2c_adapter *adap,
557 : struct i2c_msg *msgs, int num);
558 : int (*smbus_xfer)(struct i2c_adapter *adap, u16 addr,
559 : unsigned short flags, char read_write,
560 : u8 command, int size, union i2c_smbus_data *data);
561 : int (*smbus_xfer_atomic)(struct i2c_adapter *adap, u16 addr,
562 : unsigned short flags, char read_write,
563 : u8 command, int size, union i2c_smbus_data *data);
564 :
565 : /* To determine what the adapter supports */
566 : u32 (*functionality)(struct i2c_adapter *adap);
567 :
568 : #if IS_ENABLED(CONFIG_I2C_SLAVE)
569 : int (*reg_slave)(struct i2c_client *client);
570 : int (*unreg_slave)(struct i2c_client *client);
571 : #endif
572 : };
573 :
574 : /**
575 : * struct i2c_lock_operations - represent I2C locking operations
576 : * @lock_bus: Get exclusive access to an I2C bus segment
577 : * @trylock_bus: Try to get exclusive access to an I2C bus segment
578 : * @unlock_bus: Release exclusive access to an I2C bus segment
579 : *
580 : * The main operations are wrapped by i2c_lock_bus and i2c_unlock_bus.
581 : */
582 : struct i2c_lock_operations {
583 : void (*lock_bus)(struct i2c_adapter *adapter, unsigned int flags);
584 : int (*trylock_bus)(struct i2c_adapter *adapter, unsigned int flags);
585 : void (*unlock_bus)(struct i2c_adapter *adapter, unsigned int flags);
586 : };
587 :
588 : /**
589 : * struct i2c_timings - I2C timing information
590 : * @bus_freq_hz: the bus frequency in Hz
591 : * @scl_rise_ns: time SCL signal takes to rise in ns; t(r) in the I2C specification
592 : * @scl_fall_ns: time SCL signal takes to fall in ns; t(f) in the I2C specification
593 : * @scl_int_delay_ns: time IP core additionally needs to setup SCL in ns
594 : * @sda_fall_ns: time SDA signal takes to fall in ns; t(f) in the I2C specification
595 : * @sda_hold_ns: time IP core additionally needs to hold SDA in ns
596 : * @digital_filter_width_ns: width in ns of spikes on i2c lines that the IP core
597 : * digital filter can filter out
598 : * @analog_filter_cutoff_freq_hz: threshold frequency for the low pass IP core
599 : * analog filter
600 : */
601 : struct i2c_timings {
602 : u32 bus_freq_hz;
603 : u32 scl_rise_ns;
604 : u32 scl_fall_ns;
605 : u32 scl_int_delay_ns;
606 : u32 sda_fall_ns;
607 : u32 sda_hold_ns;
608 : u32 digital_filter_width_ns;
609 : u32 analog_filter_cutoff_freq_hz;
610 : };
611 :
612 : /**
613 : * struct i2c_bus_recovery_info - I2C bus recovery information
614 : * @recover_bus: Recover routine. Either pass driver's recover_bus() routine, or
615 : * i2c_generic_scl_recovery().
616 : * @get_scl: This gets current value of SCL line. Mandatory for generic SCL
617 : * recovery. Populated internally for generic GPIO recovery.
618 : * @set_scl: This sets/clears the SCL line. Mandatory for generic SCL recovery.
619 : * Populated internally for generic GPIO recovery.
620 : * @get_sda: This gets current value of SDA line. This or set_sda() is mandatory
621 : * for generic SCL recovery. Populated internally, if sda_gpio is a valid
622 : * GPIO, for generic GPIO recovery.
623 : * @set_sda: This sets/clears the SDA line. This or get_sda() is mandatory for
624 : * generic SCL recovery. Populated internally, if sda_gpio is a valid GPIO,
625 : * for generic GPIO recovery.
626 : * @get_bus_free: Returns the bus free state as seen from the IP core in case it
627 : * has a more complex internal logic than just reading SDA. Optional.
628 : * @prepare_recovery: This will be called before starting recovery. Platform may
629 : * configure padmux here for SDA/SCL line or something else they want.
630 : * @unprepare_recovery: This will be called after completing recovery. Platform
631 : * may configure padmux here for SDA/SCL line or something else they want.
632 : * @scl_gpiod: gpiod of the SCL line. Only required for GPIO recovery.
633 : * @sda_gpiod: gpiod of the SDA line. Only required for GPIO recovery.
634 : * @pinctrl: pinctrl used by GPIO recovery to change the state of the I2C pins.
635 : * Optional.
636 : * @pins_default: default pinctrl state of SCL/SDA lines, when they are assigned
637 : * to the I2C bus. Optional. Populated internally for GPIO recovery, if
638 : * state with the name PINCTRL_STATE_DEFAULT is found and pinctrl is valid.
639 : * @pins_gpio: recovery pinctrl state of SCL/SDA lines, when they are used as
640 : * GPIOs. Optional. Populated internally for GPIO recovery, if this state
641 : * is called "gpio" or "recovery" and pinctrl is valid.
642 : */
643 : struct i2c_bus_recovery_info {
644 : int (*recover_bus)(struct i2c_adapter *adap);
645 :
646 : int (*get_scl)(struct i2c_adapter *adap);
647 : void (*set_scl)(struct i2c_adapter *adap, int val);
648 : int (*get_sda)(struct i2c_adapter *adap);
649 : void (*set_sda)(struct i2c_adapter *adap, int val);
650 : int (*get_bus_free)(struct i2c_adapter *adap);
651 :
652 : void (*prepare_recovery)(struct i2c_adapter *adap);
653 : void (*unprepare_recovery)(struct i2c_adapter *adap);
654 :
655 : /* gpio recovery */
656 : struct gpio_desc *scl_gpiod;
657 : struct gpio_desc *sda_gpiod;
658 : struct pinctrl *pinctrl;
659 : struct pinctrl_state *pins_default;
660 : struct pinctrl_state *pins_gpio;
661 : };
662 :
663 : int i2c_recover_bus(struct i2c_adapter *adap);
664 :
665 : /* Generic recovery routines */
666 : int i2c_generic_scl_recovery(struct i2c_adapter *adap);
667 :
668 : /**
669 : * struct i2c_adapter_quirks - describe flaws of an i2c adapter
670 : * @flags: see I2C_AQ_* for possible flags and read below
671 : * @max_num_msgs: maximum number of messages per transfer
672 : * @max_write_len: maximum length of a write message
673 : * @max_read_len: maximum length of a read message
674 : * @max_comb_1st_msg_len: maximum length of the first msg in a combined message
675 : * @max_comb_2nd_msg_len: maximum length of the second msg in a combined message
676 : *
677 : * Note about combined messages: Some I2C controllers can only send one message
678 : * per transfer, plus something called combined message or write-then-read.
679 : * This is (usually) a small write message followed by a read message and
680 : * barely enough to access register based devices like EEPROMs. There is a flag
681 : * to support this mode. It implies max_num_msg = 2 and does the length checks
682 : * with max_comb_*_len because combined message mode usually has its own
683 : * limitations. Because of HW implementations, some controllers can actually do
684 : * write-then-anything or other variants. To support that, write-then-read has
685 : * been broken out into smaller bits like write-first and read-second which can
686 : * be combined as needed.
687 : */
688 :
689 : struct i2c_adapter_quirks {
690 : u64 flags;
691 : int max_num_msgs;
692 : u16 max_write_len;
693 : u16 max_read_len;
694 : u16 max_comb_1st_msg_len;
695 : u16 max_comb_2nd_msg_len;
696 : };
697 :
698 : /* enforce max_num_msgs = 2 and use max_comb_*_len for length checks */
699 : #define I2C_AQ_COMB BIT(0)
700 : /* first combined message must be write */
701 : #define I2C_AQ_COMB_WRITE_FIRST BIT(1)
702 : /* second combined message must be read */
703 : #define I2C_AQ_COMB_READ_SECOND BIT(2)
704 : /* both combined messages must have the same target address */
705 : #define I2C_AQ_COMB_SAME_ADDR BIT(3)
706 : /* convenience macro for typical write-then read case */
707 : #define I2C_AQ_COMB_WRITE_THEN_READ (I2C_AQ_COMB | I2C_AQ_COMB_WRITE_FIRST | \
708 : I2C_AQ_COMB_READ_SECOND | I2C_AQ_COMB_SAME_ADDR)
709 : /* clock stretching is not supported */
710 : #define I2C_AQ_NO_CLK_STRETCH BIT(4)
711 : /* message cannot have length of 0 */
712 : #define I2C_AQ_NO_ZERO_LEN_READ BIT(5)
713 : #define I2C_AQ_NO_ZERO_LEN_WRITE BIT(6)
714 : #define I2C_AQ_NO_ZERO_LEN (I2C_AQ_NO_ZERO_LEN_READ | I2C_AQ_NO_ZERO_LEN_WRITE)
715 : /* adapter cannot do repeated START */
716 : #define I2C_AQ_NO_REP_START BIT(7)
717 :
718 : /*
719 : * i2c_adapter is the structure used to identify a physical i2c bus along
720 : * with the access algorithms necessary to access it.
721 : */
722 : struct i2c_adapter {
723 : struct module *owner;
724 : unsigned int class; /* classes to allow probing for */
725 : const struct i2c_algorithm *algo; /* the algorithm to access the bus */
726 : void *algo_data;
727 :
728 : /* data fields that are valid for all devices */
729 : const struct i2c_lock_operations *lock_ops;
730 : struct rt_mutex bus_lock;
731 : struct rt_mutex mux_lock;
732 :
733 : int timeout; /* in jiffies */
734 : int retries;
735 : struct device dev; /* the adapter device */
736 : unsigned long locked_flags; /* owned by the I2C core */
737 : #define I2C_ALF_IS_SUSPENDED 0
738 : #define I2C_ALF_SUSPEND_REPORTED 1
739 :
740 : int nr;
741 : char name[48];
742 : struct completion dev_released;
743 :
744 : struct mutex userspace_clients_lock;
745 : struct list_head userspace_clients;
746 :
747 : struct i2c_bus_recovery_info *bus_recovery_info;
748 : const struct i2c_adapter_quirks *quirks;
749 :
750 : struct irq_domain *host_notify_domain;
751 : struct regulator *bus_regulator;
752 : };
753 : #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
754 :
755 : static inline void *i2c_get_adapdata(const struct i2c_adapter *adap)
756 : {
757 : return dev_get_drvdata(&adap->dev);
758 : }
759 :
760 : static inline void i2c_set_adapdata(struct i2c_adapter *adap, void *data)
761 : {
762 : dev_set_drvdata(&adap->dev, data);
763 : }
764 :
765 : static inline struct i2c_adapter *
766 : i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter)
767 : {
768 : #if IS_ENABLED(CONFIG_I2C_MUX)
769 : struct device *parent = adapter->dev.parent;
770 :
771 : if (parent != NULL && parent->type == &i2c_adapter_type)
772 : return to_i2c_adapter(parent);
773 : else
774 : #endif
775 : return NULL;
776 : }
777 :
778 : int i2c_for_each_dev(void *data, int (*fn)(struct device *dev, void *data));
779 :
780 : /* Adapter locking functions, exported for shared pin cases */
781 : #define I2C_LOCK_ROOT_ADAPTER BIT(0)
782 : #define I2C_LOCK_SEGMENT BIT(1)
783 :
784 : /**
785 : * i2c_lock_bus - Get exclusive access to an I2C bus segment
786 : * @adapter: Target I2C bus segment
787 : * @flags: I2C_LOCK_ROOT_ADAPTER locks the root i2c adapter, I2C_LOCK_SEGMENT
788 : * locks only this branch in the adapter tree
789 : */
790 : static inline void
791 : i2c_lock_bus(struct i2c_adapter *adapter, unsigned int flags)
792 : {
793 0 : adapter->lock_ops->lock_bus(adapter, flags);
794 : }
795 :
796 : /**
797 : * i2c_trylock_bus - Try to get exclusive access to an I2C bus segment
798 : * @adapter: Target I2C bus segment
799 : * @flags: I2C_LOCK_ROOT_ADAPTER tries to locks the root i2c adapter,
800 : * I2C_LOCK_SEGMENT tries to lock only this branch in the adapter tree
801 : *
802 : * Return: true if the I2C bus segment is locked, false otherwise
803 : */
804 : static inline int
805 : i2c_trylock_bus(struct i2c_adapter *adapter, unsigned int flags)
806 : {
807 0 : return adapter->lock_ops->trylock_bus(adapter, flags);
808 : }
809 :
810 : /**
811 : * i2c_unlock_bus - Release exclusive access to an I2C bus segment
812 : * @adapter: Target I2C bus segment
813 : * @flags: I2C_LOCK_ROOT_ADAPTER unlocks the root i2c adapter, I2C_LOCK_SEGMENT
814 : * unlocks only this branch in the adapter tree
815 : */
816 : static inline void
817 : i2c_unlock_bus(struct i2c_adapter *adapter, unsigned int flags)
818 : {
819 0 : adapter->lock_ops->unlock_bus(adapter, flags);
820 : }
821 :
822 : /**
823 : * i2c_mark_adapter_suspended - Report suspended state of the adapter to the core
824 : * @adap: Adapter to mark as suspended
825 : *
826 : * When using this helper to mark an adapter as suspended, the core will reject
827 : * further transfers to this adapter. The usage of this helper is optional but
828 : * recommended for devices having distinct handlers for system suspend and
829 : * runtime suspend. More complex devices are free to implement custom solutions
830 : * to reject transfers when suspended.
831 : */
832 : static inline void i2c_mark_adapter_suspended(struct i2c_adapter *adap)
833 : {
834 : i2c_lock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
835 : set_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags);
836 : i2c_unlock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
837 : }
838 :
839 : /**
840 : * i2c_mark_adapter_resumed - Report resumed state of the adapter to the core
841 : * @adap: Adapter to mark as resumed
842 : *
843 : * When using this helper to mark an adapter as resumed, the core will allow
844 : * further transfers to this adapter. See also further notes to
845 : * @i2c_mark_adapter_suspended().
846 : */
847 : static inline void i2c_mark_adapter_resumed(struct i2c_adapter *adap)
848 : {
849 : i2c_lock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
850 : clear_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags);
851 : i2c_unlock_bus(adap, I2C_LOCK_ROOT_ADAPTER);
852 : }
853 :
854 : /* i2c adapter classes (bitmask) */
855 : #define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */
856 : #define I2C_CLASS_DDC (1<<3) /* DDC bus on graphics adapters */
857 : #define I2C_CLASS_SPD (1<<7) /* Memory modules */
858 : /* Warn users that the adapter doesn't support classes anymore */
859 : #define I2C_CLASS_DEPRECATED (1<<8)
860 :
861 : /* Internal numbers to terminate lists */
862 : #define I2C_CLIENT_END 0xfffeU
863 :
864 : /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */
865 : #define I2C_ADDRS(addr, addrs...) \
866 : ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END })
867 :
868 :
869 : /* ----- functions exported by i2c.o */
870 :
871 : /* administration...
872 : */
873 : #if IS_ENABLED(CONFIG_I2C)
874 : int i2c_add_adapter(struct i2c_adapter *adap);
875 : int devm_i2c_add_adapter(struct device *dev, struct i2c_adapter *adapter);
876 : void i2c_del_adapter(struct i2c_adapter *adap);
877 : int i2c_add_numbered_adapter(struct i2c_adapter *adap);
878 :
879 : int i2c_register_driver(struct module *owner, struct i2c_driver *driver);
880 : void i2c_del_driver(struct i2c_driver *driver);
881 :
882 : /* use a define to avoid include chaining to get THIS_MODULE */
883 : #define i2c_add_driver(driver) \
884 : i2c_register_driver(THIS_MODULE, driver)
885 :
886 : static inline bool i2c_client_has_driver(struct i2c_client *client)
887 : {
888 0 : return !IS_ERR_OR_NULL(client) && client->dev.driver;
889 : }
890 :
891 : /* call the i2c_client->command() of all attached clients with
892 : * the given arguments */
893 : void i2c_clients_command(struct i2c_adapter *adap,
894 : unsigned int cmd, void *arg);
895 :
896 : struct i2c_adapter *i2c_get_adapter(int nr);
897 : void i2c_put_adapter(struct i2c_adapter *adap);
898 : unsigned int i2c_adapter_depth(struct i2c_adapter *adapter);
899 :
900 : void i2c_parse_fw_timings(struct device *dev, struct i2c_timings *t, bool use_defaults);
901 :
902 : /* Return the functionality mask */
903 : static inline u32 i2c_get_functionality(struct i2c_adapter *adap)
904 : {
905 0 : return adap->algo->functionality(adap);
906 : }
907 :
908 : /* Return 1 if adapter supports everything we need, 0 if not. */
909 : static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func)
910 : {
911 0 : return (func & i2c_get_functionality(adap)) == func;
912 : }
913 :
914 : /**
915 : * i2c_check_quirks() - Function for checking the quirk flags in an i2c adapter
916 : * @adap: i2c adapter
917 : * @quirks: quirk flags
918 : *
919 : * Return: true if the adapter has all the specified quirk flags, false if not
920 : */
921 : static inline bool i2c_check_quirks(struct i2c_adapter *adap, u64 quirks)
922 : {
923 : if (!adap->quirks)
924 : return false;
925 : return (adap->quirks->flags & quirks) == quirks;
926 : }
927 :
928 : /* Return the adapter number for a specific adapter */
929 : static inline int i2c_adapter_id(struct i2c_adapter *adap)
930 : {
931 : return adap->nr;
932 : }
933 :
934 : static inline u8 i2c_8bit_addr_from_msg(const struct i2c_msg *msg)
935 : {
936 0 : return (msg->addr << 1) | (msg->flags & I2C_M_RD ? 1 : 0);
937 : }
938 :
939 : u8 *i2c_get_dma_safe_msg_buf(struct i2c_msg *msg, unsigned int threshold);
940 : void i2c_put_dma_safe_msg_buf(u8 *buf, struct i2c_msg *msg, bool xferred);
941 :
942 : int i2c_handle_smbus_host_notify(struct i2c_adapter *adap, unsigned short addr);
943 : /**
944 : * module_i2c_driver() - Helper macro for registering a modular I2C driver
945 : * @__i2c_driver: i2c_driver struct
946 : *
947 : * Helper macro for I2C drivers which do not do anything special in module
948 : * init/exit. This eliminates a lot of boilerplate. Each module may only
949 : * use this macro once, and calling it replaces module_init() and module_exit()
950 : */
951 : #define module_i2c_driver(__i2c_driver) \
952 : module_driver(__i2c_driver, i2c_add_driver, \
953 : i2c_del_driver)
954 :
955 : /**
956 : * builtin_i2c_driver() - Helper macro for registering a builtin I2C driver
957 : * @__i2c_driver: i2c_driver struct
958 : *
959 : * Helper macro for I2C drivers which do not do anything special in their
960 : * init. This eliminates a lot of boilerplate. Each driver may only
961 : * use this macro once, and calling it replaces device_initcall().
962 : */
963 : #define builtin_i2c_driver(__i2c_driver) \
964 : builtin_driver(__i2c_driver, i2c_add_driver)
965 :
966 : #endif /* I2C */
967 :
968 : /* must call put_device() when done with returned i2c_client device */
969 : struct i2c_client *i2c_find_device_by_fwnode(struct fwnode_handle *fwnode);
970 :
971 : /* must call put_device() when done with returned i2c_adapter device */
972 : struct i2c_adapter *i2c_find_adapter_by_fwnode(struct fwnode_handle *fwnode);
973 :
974 : /* must call i2c_put_adapter() when done with returned i2c_adapter device */
975 : struct i2c_adapter *i2c_get_adapter_by_fwnode(struct fwnode_handle *fwnode);
976 :
977 : #if IS_ENABLED(CONFIG_OF)
978 : /* must call put_device() when done with returned i2c_client device */
979 : static inline struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
980 : {
981 : return i2c_find_device_by_fwnode(of_fwnode_handle(node));
982 : }
983 :
984 : /* must call put_device() when done with returned i2c_adapter device */
985 : static inline struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
986 : {
987 : return i2c_find_adapter_by_fwnode(of_fwnode_handle(node));
988 : }
989 :
990 : /* must call i2c_put_adapter() when done with returned i2c_adapter device */
991 : static inline struct i2c_adapter *of_get_i2c_adapter_by_node(struct device_node *node)
992 : {
993 : return i2c_get_adapter_by_fwnode(of_fwnode_handle(node));
994 : }
995 :
996 : const struct of_device_id
997 : *i2c_of_match_device(const struct of_device_id *matches,
998 : struct i2c_client *client);
999 :
1000 : int of_i2c_get_board_info(struct device *dev, struct device_node *node,
1001 : struct i2c_board_info *info);
1002 :
1003 : #else
1004 :
1005 : static inline struct i2c_client *of_find_i2c_device_by_node(struct device_node *node)
1006 : {
1007 : return NULL;
1008 : }
1009 :
1010 : static inline struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node)
1011 : {
1012 : return NULL;
1013 : }
1014 :
1015 : static inline struct i2c_adapter *of_get_i2c_adapter_by_node(struct device_node *node)
1016 : {
1017 : return NULL;
1018 : }
1019 :
1020 : static inline const struct of_device_id
1021 : *i2c_of_match_device(const struct of_device_id *matches,
1022 : struct i2c_client *client)
1023 : {
1024 : return NULL;
1025 : }
1026 :
1027 : static inline int of_i2c_get_board_info(struct device *dev,
1028 : struct device_node *node,
1029 : struct i2c_board_info *info)
1030 : {
1031 : return -ENOTSUPP;
1032 : }
1033 :
1034 : #endif /* CONFIG_OF */
1035 :
1036 : struct acpi_resource;
1037 : struct acpi_resource_i2c_serialbus;
1038 :
1039 : #if IS_ENABLED(CONFIG_ACPI)
1040 : bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
1041 : struct acpi_resource_i2c_serialbus **i2c);
1042 : int i2c_acpi_client_count(struct acpi_device *adev);
1043 : u32 i2c_acpi_find_bus_speed(struct device *dev);
1044 : struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode,
1045 : int index,
1046 : struct i2c_board_info *info);
1047 : struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle);
1048 : bool i2c_acpi_waive_d0_probe(struct device *dev);
1049 : #else
1050 : static inline bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
1051 : struct acpi_resource_i2c_serialbus **i2c)
1052 : {
1053 : return false;
1054 : }
1055 : static inline int i2c_acpi_client_count(struct acpi_device *adev)
1056 : {
1057 : return 0;
1058 : }
1059 : static inline u32 i2c_acpi_find_bus_speed(struct device *dev)
1060 : {
1061 : return 0;
1062 : }
1063 : static inline struct i2c_client *i2c_acpi_new_device_by_fwnode(
1064 : struct fwnode_handle *fwnode, int index,
1065 : struct i2c_board_info *info)
1066 : {
1067 : return ERR_PTR(-ENODEV);
1068 : }
1069 : static inline struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
1070 : {
1071 : return NULL;
1072 : }
1073 : static inline bool i2c_acpi_waive_d0_probe(struct device *dev)
1074 : {
1075 : return false;
1076 : }
1077 : #endif /* CONFIG_ACPI */
1078 :
1079 : static inline struct i2c_client *i2c_acpi_new_device(struct device *dev,
1080 : int index,
1081 : struct i2c_board_info *info)
1082 : {
1083 : return i2c_acpi_new_device_by_fwnode(dev_fwnode(dev), index, info);
1084 : }
1085 :
1086 : #endif /* _LINUX_I2C_H */
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