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 const struct bus_type i2c_bus_type; 27 extern const struct device_type i2c_adapter_type; 28 extern const struct device_type i2c_client_type; 29 30 /* --- General options ------------------------------------------------ */ 31 32 struct i2c_msg; 33 struct i2c_adapter; 34 struct i2c_client; 35 struct i2c_driver; 36 struct i2c_device_identity; 37 union i2c_smbus_data; 38 struct i2c_board_info; 39 enum i2c_slave_event; 40 typedef int (*i2c_slave_cb_t)(struct i2c_client *client, 41 enum i2c_slave_event event, u8 *val); 42 43 /* I2C Frequency Modes */ 44 #define I2C_MAX_STANDARD_MODE_FREQ 100000 45 #define I2C_MAX_FAST_MODE_FREQ 400000 46 #define I2C_MAX_FAST_MODE_PLUS_FREQ 1000000 47 #define I2C_MAX_TURBO_MODE_FREQ 1400000 48 #define I2C_MAX_HIGH_SPEED_MODE_FREQ 3400000 49 #define I2C_MAX_ULTRA_FAST_MODE_FREQ 5000000 50 51 struct module; 52 struct property_entry; 53 54 #if IS_ENABLED(CONFIG_I2C) 55 /* Return the Frequency mode string based on the bus frequency */ 56 const char *i2c_freq_mode_string(u32 bus_freq_hz); 57 58 /* 59 * The master routines are the ones normally used to transmit data to devices 60 * on a bus (or read from them). Apart from two basic transfer functions to 61 * transmit one message at a time, a more complex version can be used to 62 * transmit an arbitrary number of messages without interruption. 63 * @count must be less than 64k since msg.len is u16. 64 */ 65 int i2c_transfer_buffer_flags(const struct i2c_client *client, 66 char *buf, int count, u16 flags); 67 68 /** 69 * i2c_master_recv - issue a single I2C message in master receive mode 70 * @client: Handle to slave device 71 * @buf: Where to store data read from slave 72 * @count: How many bytes to read, must be less than 64k since msg.len is u16 73 * 74 * Returns negative errno, or else the number of bytes read. 75 */ i2c_master_recv(const struct i2c_client * client,char * buf,int count)76 static inline int i2c_master_recv(const struct i2c_client *client, 77 char *buf, int count) 78 { 79 return i2c_transfer_buffer_flags(client, buf, count, I2C_M_RD); 80 }; 81 82 /** 83 * i2c_master_recv_dmasafe - issue a single I2C message in master receive mode 84 * using a DMA safe buffer 85 * @client: Handle to slave device 86 * @buf: Where to store data read from slave, must be safe to use with DMA 87 * @count: How many bytes to read, must be less than 64k since msg.len is u16 88 * 89 * Returns negative errno, or else the number of bytes read. 90 */ i2c_master_recv_dmasafe(const struct i2c_client * client,char * buf,int count)91 static inline int i2c_master_recv_dmasafe(const struct i2c_client *client, 92 char *buf, int count) 93 { 94 return i2c_transfer_buffer_flags(client, buf, count, 95 I2C_M_RD | I2C_M_DMA_SAFE); 96 }; 97 98 /** 99 * i2c_master_send - issue a single I2C message in master transmit mode 100 * @client: Handle to slave device 101 * @buf: Data that will be written to the slave 102 * @count: How many bytes to write, must be less than 64k since msg.len is u16 103 * 104 * Returns negative errno, or else the number of bytes written. 105 */ i2c_master_send(const struct i2c_client * client,const char * buf,int count)106 static inline int i2c_master_send(const struct i2c_client *client, 107 const char *buf, int count) 108 { 109 return i2c_transfer_buffer_flags(client, (char *)buf, count, 0); 110 }; 111 112 /** 113 * i2c_master_send_dmasafe - issue a single I2C message in master transmit mode 114 * using a DMA safe buffer 115 * @client: Handle to slave device 116 * @buf: Data that will be written to the slave, must be safe to use with DMA 117 * @count: How many bytes to write, must be less than 64k since msg.len is u16 118 * 119 * Returns negative errno, or else the number of bytes written. 120 */ i2c_master_send_dmasafe(const struct i2c_client * client,const char * buf,int count)121 static inline int i2c_master_send_dmasafe(const struct i2c_client *client, 122 const char *buf, int count) 123 { 124 return i2c_transfer_buffer_flags(client, (char *)buf, count, 125 I2C_M_DMA_SAFE); 126 }; 127 128 /* Transfer num messages. 129 */ 130 int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num); 131 /* Unlocked flavor */ 132 int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num); 133 134 /* This is the very generalized SMBus access routine. You probably do not 135 want to use this, though; one of the functions below may be much easier, 136 and probably just as fast. 137 Note that we use i2c_adapter here, because you do not need a specific 138 smbus adapter to call this function. */ 139 s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, 140 unsigned short flags, char read_write, u8 command, 141 int protocol, union i2c_smbus_data *data); 142 143 /* Unlocked flavor */ 144 s32 __i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, 145 unsigned short flags, char read_write, u8 command, 146 int protocol, union i2c_smbus_data *data); 147 148 /* Now follow the 'nice' access routines. These also document the calling 149 conventions of i2c_smbus_xfer. */ 150 151 u8 i2c_smbus_pec(u8 crc, u8 *p, size_t count); 152 s32 i2c_smbus_read_byte(const struct i2c_client *client); 153 s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value); 154 s32 i2c_smbus_read_byte_data(const struct i2c_client *client, u8 command); 155 s32 i2c_smbus_write_byte_data(const struct i2c_client *client, 156 u8 command, u8 value); 157 s32 i2c_smbus_read_word_data(const struct i2c_client *client, u8 command); 158 s32 i2c_smbus_write_word_data(const struct i2c_client *client, 159 u8 command, u16 value); 160 161 static inline s32 i2c_smbus_read_word_swapped(const struct i2c_client * client,u8 command)162 i2c_smbus_read_word_swapped(const struct i2c_client *client, u8 command) 163 { 164 s32 value = i2c_smbus_read_word_data(client, command); 165 166 return (value < 0) ? value : swab16(value); 167 } 168 169 static inline s32 i2c_smbus_write_word_swapped(const struct i2c_client * client,u8 command,u16 value)170 i2c_smbus_write_word_swapped(const struct i2c_client *client, 171 u8 command, u16 value) 172 { 173 return i2c_smbus_write_word_data(client, command, swab16(value)); 174 } 175 176 /* Returns the number of read bytes */ 177 s32 i2c_smbus_read_block_data(const struct i2c_client *client, 178 u8 command, u8 *values); 179 s32 i2c_smbus_write_block_data(const struct i2c_client *client, 180 u8 command, u8 length, const u8 *values); 181 /* Returns the number of read bytes */ 182 s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client, 183 u8 command, u8 length, u8 *values); 184 s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client, 185 u8 command, u8 length, const u8 *values); 186 s32 i2c_smbus_read_i2c_block_data_or_emulated(const struct i2c_client *client, 187 u8 command, u8 length, 188 u8 *values); 189 int i2c_get_device_id(const struct i2c_client *client, 190 struct i2c_device_identity *id); 191 const struct i2c_device_id *i2c_client_get_device_id(const struct i2c_client *client); 192 #endif /* I2C */ 193 194 /** 195 * struct i2c_device_identity - i2c client device identification 196 * @manufacturer_id: 0 - 4095, database maintained by NXP 197 * @part_id: 0 - 511, according to manufacturer 198 * @die_revision: 0 - 7, according to manufacturer 199 */ 200 struct i2c_device_identity { 201 u16 manufacturer_id; 202 #define I2C_DEVICE_ID_NXP_SEMICONDUCTORS 0 203 #define I2C_DEVICE_ID_NXP_SEMICONDUCTORS_1 1 204 #define I2C_DEVICE_ID_NXP_SEMICONDUCTORS_2 2 205 #define I2C_DEVICE_ID_NXP_SEMICONDUCTORS_3 3 206 #define I2C_DEVICE_ID_RAMTRON_INTERNATIONAL 4 207 #define I2C_DEVICE_ID_ANALOG_DEVICES 5 208 #define I2C_DEVICE_ID_STMICROELECTRONICS 6 209 #define I2C_DEVICE_ID_ON_SEMICONDUCTOR 7 210 #define I2C_DEVICE_ID_SPRINTEK_CORPORATION 8 211 #define I2C_DEVICE_ID_ESPROS_PHOTONICS_AG 9 212 #define I2C_DEVICE_ID_FUJITSU_SEMICONDUCTOR 10 213 #define I2C_DEVICE_ID_FLIR 11 214 #define I2C_DEVICE_ID_O2MICRO 12 215 #define I2C_DEVICE_ID_ATMEL 13 216 #define I2C_DEVICE_ID_NONE 0xffff 217 u16 part_id; 218 u8 die_revision; 219 }; 220 221 enum i2c_alert_protocol { 222 I2C_PROTOCOL_SMBUS_ALERT, 223 I2C_PROTOCOL_SMBUS_HOST_NOTIFY, 224 }; 225 226 /** 227 * enum i2c_driver_flags - Flags for an I2C device driver 228 * 229 * @I2C_DRV_ACPI_WAIVE_D0_PROBE: Don't put the device in D0 state for probe 230 */ 231 enum i2c_driver_flags { 232 I2C_DRV_ACPI_WAIVE_D0_PROBE = BIT(0), 233 }; 234 235 /** 236 * struct i2c_driver - represent an I2C device driver 237 * @class: What kind of i2c device we instantiate (for detect) 238 * @probe: Callback for device binding 239 * @remove: Callback for device unbinding 240 * @shutdown: Callback for device shutdown 241 * @alert: Alert callback, for example for the SMBus alert protocol 242 * @command: Callback for bus-wide signaling (optional) 243 * @driver: Device driver model driver 244 * @id_table: List of I2C devices supported by this driver 245 * @detect: Callback for device detection 246 * @address_list: The I2C addresses to probe (for detect) 247 * @clients: List of detected clients we created (for i2c-core use only) 248 * @flags: A bitmask of flags defined in &enum i2c_driver_flags 249 * 250 * The driver.owner field should be set to the module owner of this driver. 251 * The driver.name field should be set to the name of this driver. 252 * 253 * For automatic device detection, both @detect and @address_list must 254 * be defined. @class should also be set, otherwise only devices forced 255 * with module parameters will be created. The detect function must 256 * fill at least the name field of the i2c_board_info structure it is 257 * handed upon successful detection, and possibly also the flags field. 258 * 259 * If @detect is missing, the driver will still work fine for enumerated 260 * devices. Detected devices simply won't be supported. This is expected 261 * for the many I2C/SMBus devices which can't be detected reliably, and 262 * the ones which can always be enumerated in practice. 263 * 264 * The i2c_client structure which is handed to the @detect callback is 265 * not a real i2c_client. It is initialized just enough so that you can 266 * call i2c_smbus_read_byte_data and friends on it. Don't do anything 267 * else with it. In particular, calling dev_dbg and friends on it is 268 * not allowed. 269 */ 270 struct i2c_driver { 271 unsigned int class; 272 273 /* Standard driver model interfaces */ 274 int (*probe)(struct i2c_client *client); 275 void (*remove)(struct i2c_client *client); 276 277 278 /* driver model interfaces that don't relate to enumeration */ 279 void (*shutdown)(struct i2c_client *client); 280 281 /* Alert callback, for example for the SMBus alert protocol. 282 * The format and meaning of the data value depends on the protocol. 283 * For the SMBus alert protocol, there is a single bit of data passed 284 * as the alert response's low bit ("event flag"). 285 * For the SMBus Host Notify protocol, the data corresponds to the 286 * 16-bit payload data reported by the slave device acting as master. 287 */ 288 void (*alert)(struct i2c_client *client, enum i2c_alert_protocol protocol, 289 unsigned int data); 290 291 /* a ioctl like command that can be used to perform specific functions 292 * with the device. 293 */ 294 int (*command)(struct i2c_client *client, unsigned int cmd, void *arg); 295 296 struct device_driver driver; 297 const struct i2c_device_id *id_table; 298 299 /* Device detection callback for automatic device creation */ 300 int (*detect)(struct i2c_client *client, struct i2c_board_info *info); 301 const unsigned short *address_list; 302 struct list_head clients; 303 304 u32 flags; 305 }; 306 #define to_i2c_driver(d) container_of_const(d, struct i2c_driver, driver) 307 308 /** 309 * struct i2c_client - represent an I2C slave device 310 * @flags: see I2C_CLIENT_* for possible flags 311 * @addr: Address used on the I2C bus connected to the parent adapter. 312 * @name: Indicates the type of the device, usually a chip name that's 313 * generic enough to hide second-sourcing and compatible revisions. 314 * @adapter: manages the bus segment hosting this I2C device 315 * @dev: Driver model device node for the slave. 316 * @init_irq: IRQ that was set at initialization 317 * @irq: indicates the IRQ generated by this device (if any) 318 * @detected: member of an i2c_driver.clients list or i2c-core's 319 * userspace_devices list 320 * @slave_cb: Callback when I2C slave mode of an adapter is used. The adapter 321 * calls it to pass on slave events to the slave driver. 322 * @devres_group_id: id of the devres group that will be created for resources 323 * acquired when probing this device. 324 * @debugfs: pointer to the debugfs subdirectory which the I2C core created 325 * for this client. 326 * 327 * An i2c_client identifies a single device (i.e. chip) connected to an 328 * i2c bus. The behaviour exposed to Linux is defined by the driver 329 * managing the device. 330 */ 331 struct i2c_client { 332 unsigned short flags; /* div., see below */ 333 #define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */ 334 #define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */ 335 /* Must equal I2C_M_TEN below */ 336 #define I2C_CLIENT_SLAVE 0x20 /* we are the slave */ 337 #define I2C_CLIENT_HOST_NOTIFY 0x40 /* We want to use I2C host notify */ 338 #define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */ 339 #define I2C_CLIENT_SCCB 0x9000 /* Use Omnivision SCCB protocol */ 340 /* Must match I2C_M_STOP|IGNORE_NAK */ 341 342 unsigned short addr; /* chip address - NOTE: 7bit */ 343 /* addresses are stored in the */ 344 /* _LOWER_ 7 bits */ 345 char name[I2C_NAME_SIZE]; 346 struct i2c_adapter *adapter; /* the adapter we sit on */ 347 struct device dev; /* the device structure */ 348 int init_irq; /* irq set at initialization */ 349 int irq; /* irq issued by device */ 350 struct list_head detected; 351 #if IS_ENABLED(CONFIG_I2C_SLAVE) 352 i2c_slave_cb_t slave_cb; /* callback for slave mode */ 353 #endif 354 void *devres_group_id; /* ID of probe devres group */ 355 struct dentry *debugfs; /* per-client debugfs dir */ 356 }; 357 #define to_i2c_client(d) container_of(d, struct i2c_client, dev) 358 359 struct i2c_adapter *i2c_verify_adapter(struct device *dev); 360 const struct i2c_device_id *i2c_match_id(const struct i2c_device_id *id, 361 const struct i2c_client *client); 362 363 const void *i2c_get_match_data(const struct i2c_client *client); 364 kobj_to_i2c_client(struct kobject * kobj)365 static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj) 366 { 367 struct device * const dev = kobj_to_dev(kobj); 368 return to_i2c_client(dev); 369 } 370 i2c_get_clientdata(const struct i2c_client * client)371 static inline void *i2c_get_clientdata(const struct i2c_client *client) 372 { 373 return dev_get_drvdata(&client->dev); 374 } 375 i2c_set_clientdata(struct i2c_client * client,void * data)376 static inline void i2c_set_clientdata(struct i2c_client *client, void *data) 377 { 378 dev_set_drvdata(&client->dev, data); 379 } 380 381 /* I2C slave support */ 382 383 enum i2c_slave_event { 384 I2C_SLAVE_READ_REQUESTED, 385 I2C_SLAVE_WRITE_REQUESTED, 386 I2C_SLAVE_READ_PROCESSED, 387 I2C_SLAVE_WRITE_RECEIVED, 388 I2C_SLAVE_STOP, 389 }; 390 391 int i2c_slave_register(struct i2c_client *client, i2c_slave_cb_t slave_cb); 392 int i2c_slave_unregister(struct i2c_client *client); 393 int i2c_slave_event(struct i2c_client *client, 394 enum i2c_slave_event event, u8 *val); 395 #if IS_ENABLED(CONFIG_I2C_SLAVE) 396 bool i2c_detect_slave_mode(struct device *dev); 397 #else i2c_detect_slave_mode(struct device * dev)398 static inline bool i2c_detect_slave_mode(struct device *dev) { return false; } 399 #endif 400 401 /** 402 * struct i2c_board_info - template for device creation 403 * @type: chip type, to initialize i2c_client.name 404 * @flags: to initialize i2c_client.flags 405 * @addr: stored in i2c_client.addr 406 * @dev_name: Overrides the default <busnr>-<addr> dev_name if set 407 * @platform_data: stored in i2c_client.dev.platform_data 408 * @of_node: pointer to OpenFirmware device node 409 * @fwnode: device node supplied by the platform firmware 410 * @swnode: software node for the device 411 * @resources: resources associated with the device 412 * @num_resources: number of resources in the @resources array 413 * @irq: stored in i2c_client.irq 414 * 415 * I2C doesn't actually support hardware probing, although controllers and 416 * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's 417 * a device at a given address. Drivers commonly need more information than 418 * that, such as chip type, configuration, associated IRQ, and so on. 419 * 420 * i2c_board_info is used to build tables of information listing I2C devices 421 * that are present. This information is used to grow the driver model tree. 422 * For mainboards this is done statically using i2c_register_board_info(); 423 * bus numbers identify adapters that aren't yet available. For add-on boards, 424 * i2c_new_client_device() does this dynamically with the adapter already known. 425 */ 426 struct i2c_board_info { 427 char type[I2C_NAME_SIZE]; 428 unsigned short flags; 429 unsigned short addr; 430 const char *dev_name; 431 void *platform_data; 432 struct device_node *of_node; 433 struct fwnode_handle *fwnode; 434 const struct software_node *swnode; 435 const struct resource *resources; 436 unsigned int num_resources; 437 int irq; 438 }; 439 440 /** 441 * I2C_BOARD_INFO - macro used to list an i2c device and its address 442 * @dev_type: identifies the device type 443 * @dev_addr: the device's address on the bus. 444 * 445 * This macro initializes essential fields of a struct i2c_board_info, 446 * declaring what has been provided on a particular board. Optional 447 * fields (such as associated irq, or device-specific platform_data) 448 * are provided using conventional syntax. 449 */ 450 #define I2C_BOARD_INFO(dev_type, dev_addr) \ 451 .type = dev_type, .addr = (dev_addr) 452 453 454 #if IS_ENABLED(CONFIG_I2C) 455 /* 456 * Add-on boards should register/unregister their devices; e.g. a board 457 * with integrated I2C, a config eeprom, sensors, and a codec that's 458 * used in conjunction with the primary hardware. 459 */ 460 struct i2c_client * 461 i2c_new_client_device(struct i2c_adapter *adap, struct i2c_board_info const *info); 462 463 /* If you don't know the exact address of an I2C device, use this variant 464 * instead, which can probe for device presence in a list of possible 465 * addresses. The "probe" callback function is optional. If it is provided, 466 * it must return 1 on successful probe, 0 otherwise. If it is not provided, 467 * a default probing method is used. 468 */ 469 struct i2c_client * 470 i2c_new_scanned_device(struct i2c_adapter *adap, 471 struct i2c_board_info *info, 472 unsigned short const *addr_list, 473 int (*probe)(struct i2c_adapter *adap, unsigned short addr)); 474 475 /* Common custom probe functions */ 476 int i2c_probe_func_quick_read(struct i2c_adapter *adap, unsigned short addr); 477 478 struct i2c_client * 479 i2c_new_dummy_device(struct i2c_adapter *adapter, u16 address); 480 481 struct i2c_client * 482 devm_i2c_new_dummy_device(struct device *dev, struct i2c_adapter *adap, u16 address); 483 484 struct i2c_client * 485 i2c_new_ancillary_device(struct i2c_client *client, 486 const char *name, 487 u16 default_addr); 488 489 void i2c_unregister_device(struct i2c_client *client); 490 491 struct i2c_client *i2c_verify_client(struct device *dev); 492 #else i2c_verify_client(struct device * dev)493 static inline struct i2c_client *i2c_verify_client(struct device *dev) 494 { 495 return NULL; 496 } 497 #endif /* I2C */ 498 499 /* Mainboard arch_initcall() code should register all its I2C devices. 500 * This is done at arch_initcall time, before declaring any i2c adapters. 501 * Modules for add-on boards must use other calls. 502 */ 503 #ifdef CONFIG_I2C_BOARDINFO 504 int 505 i2c_register_board_info(int busnum, struct i2c_board_info const *info, 506 unsigned n); 507 #else 508 static inline int i2c_register_board_info(int busnum,struct i2c_board_info const * info,unsigned n)509 i2c_register_board_info(int busnum, struct i2c_board_info const *info, 510 unsigned n) 511 { 512 return 0; 513 } 514 #endif /* I2C_BOARDINFO */ 515 516 /** 517 * struct i2c_algorithm - represent I2C transfer methods 518 * @xfer: Transfer a given number of messages defined by the msgs array via 519 * the specified adapter. 520 * @xfer_atomic: Same as @xfer. Yet, only using atomic context so e.g. PMICs 521 * can be accessed very late before shutdown. Optional. 522 * @smbus_xfer: Issue SMBus transactions to the given I2C adapter. If this 523 * is not present, then the bus layer will try and convert the SMBus calls 524 * into I2C transfers instead. 525 * @smbus_xfer_atomic: Same as @smbus_xfer. Yet, only using atomic context 526 * so e.g. PMICs can be accessed very late before shutdown. Optional. 527 * @functionality: Return the flags that this algorithm/adapter pair supports 528 * from the ``I2C_FUNC_*`` flags. 529 * @reg_target: Register given client to local target mode of this adapter 530 * @unreg_target: Unregister given client from local target mode of this adapter 531 * 532 * @master_xfer: deprecated, use @xfer 533 * @master_xfer_atomic: deprecated, use @xfer_atomic 534 * @reg_slave: deprecated, use @reg_target 535 * @unreg_slave: deprecated, use @unreg_target 536 * 537 * i2c_algorithm is the interface to a class of hardware solutions which can 538 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584 539 * to name two of the most common. 540 * 541 * The return codes from the ``xfer{_atomic}`` fields should indicate the 542 * type of error code that occurred during the transfer, as documented in the 543 * Kernel Documentation file Documentation/i2c/fault-codes.rst. Otherwise, the 544 * number of messages executed should be returned. 545 */ 546 struct i2c_algorithm { 547 /* 548 * If an adapter algorithm can't do I2C-level access, set xfer 549 * to NULL. If an adapter algorithm can do SMBus access, set 550 * smbus_xfer. If set to NULL, the SMBus protocol is simulated 551 * using common I2C messages. 552 */ 553 union { 554 int (*xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs, 555 int num); 556 int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs, 557 int num); 558 }; 559 union { 560 int (*xfer_atomic)(struct i2c_adapter *adap, 561 struct i2c_msg *msgs, int num); 562 int (*master_xfer_atomic)(struct i2c_adapter *adap, 563 struct i2c_msg *msgs, int num); 564 }; 565 int (*smbus_xfer)(struct i2c_adapter *adap, u16 addr, 566 unsigned short flags, char read_write, 567 u8 command, int size, union i2c_smbus_data *data); 568 int (*smbus_xfer_atomic)(struct i2c_adapter *adap, u16 addr, 569 unsigned short flags, char read_write, 570 u8 command, int size, union i2c_smbus_data *data); 571 572 /* To determine what the adapter supports */ 573 u32 (*functionality)(struct i2c_adapter *adap); 574 575 #if IS_ENABLED(CONFIG_I2C_SLAVE) 576 union { 577 int (*reg_target)(struct i2c_client *client); 578 int (*reg_slave)(struct i2c_client *client); 579 }; 580 union { 581 int (*unreg_target)(struct i2c_client *client); 582 int (*unreg_slave)(struct i2c_client *client); 583 }; 584 #endif 585 }; 586 587 /** 588 * struct i2c_lock_operations - represent I2C locking operations 589 * @lock_bus: Get exclusive access to an I2C bus segment 590 * @trylock_bus: Try to get exclusive access to an I2C bus segment 591 * @unlock_bus: Release exclusive access to an I2C bus segment 592 * 593 * The main operations are wrapped by i2c_lock_bus and i2c_unlock_bus. 594 */ 595 struct i2c_lock_operations { 596 void (*lock_bus)(struct i2c_adapter *adapter, unsigned int flags); 597 int (*trylock_bus)(struct i2c_adapter *adapter, unsigned int flags); 598 void (*unlock_bus)(struct i2c_adapter *adapter, unsigned int flags); 599 }; 600 601 /** 602 * struct i2c_timings - I2C timing information 603 * @bus_freq_hz: the bus frequency in Hz 604 * @scl_rise_ns: time SCL signal takes to rise in ns; t(r) in the I2C specification 605 * @scl_fall_ns: time SCL signal takes to fall in ns; t(f) in the I2C specification 606 * @scl_int_delay_ns: time IP core additionally needs to setup SCL in ns 607 * @sda_fall_ns: time SDA signal takes to fall in ns; t(f) in the I2C specification 608 * @sda_hold_ns: time IP core additionally needs to hold SDA in ns 609 * @digital_filter_width_ns: width in ns of spikes on i2c lines that the IP core 610 * digital filter can filter out 611 * @analog_filter_cutoff_freq_hz: threshold frequency for the low pass IP core 612 * analog filter 613 */ 614 struct i2c_timings { 615 u32 bus_freq_hz; 616 u32 scl_rise_ns; 617 u32 scl_fall_ns; 618 u32 scl_int_delay_ns; 619 u32 sda_fall_ns; 620 u32 sda_hold_ns; 621 u32 digital_filter_width_ns; 622 u32 analog_filter_cutoff_freq_hz; 623 }; 624 625 /** 626 * struct i2c_bus_recovery_info - I2C bus recovery information 627 * @recover_bus: Recover routine. Either pass driver's recover_bus() routine, or 628 * i2c_generic_scl_recovery(). 629 * @get_scl: This gets current value of SCL line. Mandatory for generic SCL 630 * recovery. Populated internally for generic GPIO recovery. 631 * @set_scl: This sets/clears the SCL line. Mandatory for generic SCL recovery. 632 * Populated internally for generic GPIO recovery. 633 * @get_sda: This gets current value of SDA line. This or set_sda() is mandatory 634 * for generic SCL recovery. Populated internally, if sda_gpio is a valid 635 * GPIO, for generic GPIO recovery. 636 * @set_sda: This sets/clears the SDA line. This or get_sda() is mandatory for 637 * generic SCL recovery. Populated internally, if sda_gpio is a valid GPIO, 638 * for generic GPIO recovery. 639 * @get_bus_free: Returns the bus free state as seen from the IP core in case it 640 * has a more complex internal logic than just reading SDA. Optional. 641 * @prepare_recovery: This will be called before starting recovery. Platform may 642 * configure padmux here for SDA/SCL line or something else they want. 643 * @unprepare_recovery: This will be called after completing recovery. Platform 644 * may configure padmux here for SDA/SCL line or something else they want. 645 * @scl_gpiod: gpiod of the SCL line. Only required for GPIO recovery. 646 * @sda_gpiod: gpiod of the SDA line. Only required for GPIO recovery. 647 * @pinctrl: pinctrl used by GPIO recovery to change the state of the I2C pins. 648 * Optional. 649 * @pins_default: default pinctrl state of SCL/SDA lines, when they are assigned 650 * to the I2C bus. Optional. Populated internally for GPIO recovery, if 651 * state with the name PINCTRL_STATE_DEFAULT is found and pinctrl is valid. 652 * @pins_gpio: recovery pinctrl state of SCL/SDA lines, when they are used as 653 * GPIOs. Optional. Populated internally for GPIO recovery, if this state 654 * is called "gpio" or "recovery" and pinctrl is valid. 655 */ 656 struct i2c_bus_recovery_info { 657 int (*recover_bus)(struct i2c_adapter *adap); 658 659 int (*get_scl)(struct i2c_adapter *adap); 660 void (*set_scl)(struct i2c_adapter *adap, int val); 661 int (*get_sda)(struct i2c_adapter *adap); 662 void (*set_sda)(struct i2c_adapter *adap, int val); 663 int (*get_bus_free)(struct i2c_adapter *adap); 664 665 void (*prepare_recovery)(struct i2c_adapter *adap); 666 void (*unprepare_recovery)(struct i2c_adapter *adap); 667 668 /* gpio recovery */ 669 struct gpio_desc *scl_gpiod; 670 struct gpio_desc *sda_gpiod; 671 struct pinctrl *pinctrl; 672 struct pinctrl_state *pins_default; 673 struct pinctrl_state *pins_gpio; 674 }; 675 676 int i2c_recover_bus(struct i2c_adapter *adap); 677 678 /* Generic recovery routines */ 679 int i2c_generic_scl_recovery(struct i2c_adapter *adap); 680 681 /** 682 * struct i2c_adapter_quirks - describe flaws of an i2c adapter 683 * @flags: see I2C_AQ_* for possible flags and read below 684 * @max_num_msgs: maximum number of messages per transfer 685 * @max_write_len: maximum length of a write message 686 * @max_read_len: maximum length of a read message 687 * @max_comb_1st_msg_len: maximum length of the first msg in a combined message 688 * @max_comb_2nd_msg_len: maximum length of the second msg in a combined message 689 * 690 * Note about combined messages: Some I2C controllers can only send one message 691 * per transfer, plus something called combined message or write-then-read. 692 * This is (usually) a small write message followed by a read message and 693 * barely enough to access register based devices like EEPROMs. There is a flag 694 * to support this mode. It implies max_num_msg = 2 and does the length checks 695 * with max_comb_*_len because combined message mode usually has its own 696 * limitations. Because of HW implementations, some controllers can actually do 697 * write-then-anything or other variants. To support that, write-then-read has 698 * been broken out into smaller bits like write-first and read-second which can 699 * be combined as needed. 700 */ 701 702 struct i2c_adapter_quirks { 703 u64 flags; 704 int max_num_msgs; 705 u16 max_write_len; 706 u16 max_read_len; 707 u16 max_comb_1st_msg_len; 708 u16 max_comb_2nd_msg_len; 709 }; 710 711 /* enforce max_num_msgs = 2 and use max_comb_*_len for length checks */ 712 #define I2C_AQ_COMB BIT(0) 713 /* first combined message must be write */ 714 #define I2C_AQ_COMB_WRITE_FIRST BIT(1) 715 /* second combined message must be read */ 716 #define I2C_AQ_COMB_READ_SECOND BIT(2) 717 /* both combined messages must have the same target address */ 718 #define I2C_AQ_COMB_SAME_ADDR BIT(3) 719 /* convenience macro for typical write-then read case */ 720 #define I2C_AQ_COMB_WRITE_THEN_READ (I2C_AQ_COMB | I2C_AQ_COMB_WRITE_FIRST | \ 721 I2C_AQ_COMB_READ_SECOND | I2C_AQ_COMB_SAME_ADDR) 722 /* clock stretching is not supported */ 723 #define I2C_AQ_NO_CLK_STRETCH BIT(4) 724 /* message cannot have length of 0 */ 725 #define I2C_AQ_NO_ZERO_LEN_READ BIT(5) 726 #define I2C_AQ_NO_ZERO_LEN_WRITE BIT(6) 727 #define I2C_AQ_NO_ZERO_LEN (I2C_AQ_NO_ZERO_LEN_READ | I2C_AQ_NO_ZERO_LEN_WRITE) 728 /* adapter cannot do repeated START */ 729 #define I2C_AQ_NO_REP_START BIT(7) 730 731 /* 732 * i2c_adapter is the structure used to identify a physical i2c bus along 733 * with the access algorithms necessary to access it. 734 */ 735 struct i2c_adapter { 736 struct module *owner; 737 unsigned int class; /* classes to allow probing for */ 738 const struct i2c_algorithm *algo; /* the algorithm to access the bus */ 739 void *algo_data; 740 741 /* data fields that are valid for all devices */ 742 const struct i2c_lock_operations *lock_ops; 743 struct rt_mutex bus_lock; 744 struct rt_mutex mux_lock; 745 746 int timeout; /* in jiffies */ 747 int retries; 748 struct device dev; /* the adapter device */ 749 unsigned long locked_flags; /* owned by the I2C core */ 750 #define I2C_ALF_IS_SUSPENDED 0 751 #define I2C_ALF_SUSPEND_REPORTED 1 752 753 int nr; 754 char name[48]; 755 struct completion dev_released; 756 757 struct mutex userspace_clients_lock; 758 struct list_head userspace_clients; 759 760 struct i2c_bus_recovery_info *bus_recovery_info; 761 const struct i2c_adapter_quirks *quirks; 762 763 struct irq_domain *host_notify_domain; 764 struct regulator *bus_regulator; 765 766 struct dentry *debugfs; 767 768 /* 7bit address space */ 769 DECLARE_BITMAP(addrs_in_instantiation, 1 << 7); 770 }; 771 #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev) 772 i2c_get_adapdata(const struct i2c_adapter * adap)773 static inline void *i2c_get_adapdata(const struct i2c_adapter *adap) 774 { 775 return dev_get_drvdata(&adap->dev); 776 } 777 i2c_set_adapdata(struct i2c_adapter * adap,void * data)778 static inline void i2c_set_adapdata(struct i2c_adapter *adap, void *data) 779 { 780 dev_set_drvdata(&adap->dev, data); 781 } 782 783 static inline struct i2c_adapter * i2c_parent_is_i2c_adapter(const struct i2c_adapter * adapter)784 i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter) 785 { 786 #if IS_ENABLED(CONFIG_I2C_MUX) 787 struct device *parent = adapter->dev.parent; 788 789 if (parent != NULL && parent->type == &i2c_adapter_type) 790 return to_i2c_adapter(parent); 791 else 792 #endif 793 return NULL; 794 } 795 796 int i2c_for_each_dev(void *data, int (*fn)(struct device *dev, void *data)); 797 798 /* Adapter locking functions, exported for shared pin cases */ 799 #define I2C_LOCK_ROOT_ADAPTER BIT(0) 800 #define I2C_LOCK_SEGMENT BIT(1) 801 802 /** 803 * i2c_lock_bus - Get exclusive access to an I2C bus segment 804 * @adapter: Target I2C bus segment 805 * @flags: I2C_LOCK_ROOT_ADAPTER locks the root i2c adapter, I2C_LOCK_SEGMENT 806 * locks only this branch in the adapter tree 807 */ 808 static inline void i2c_lock_bus(struct i2c_adapter * adapter,unsigned int flags)809 i2c_lock_bus(struct i2c_adapter *adapter, unsigned int flags) 810 { 811 adapter->lock_ops->lock_bus(adapter, flags); 812 } 813 814 /** 815 * i2c_trylock_bus - Try to get exclusive access to an I2C bus segment 816 * @adapter: Target I2C bus segment 817 * @flags: I2C_LOCK_ROOT_ADAPTER tries to locks the root i2c adapter, 818 * I2C_LOCK_SEGMENT tries to lock only this branch in the adapter tree 819 * 820 * Return: true if the I2C bus segment is locked, false otherwise 821 */ 822 static inline int i2c_trylock_bus(struct i2c_adapter * adapter,unsigned int flags)823 i2c_trylock_bus(struct i2c_adapter *adapter, unsigned int flags) 824 { 825 return adapter->lock_ops->trylock_bus(adapter, flags); 826 } 827 828 /** 829 * i2c_unlock_bus - Release exclusive access to an I2C bus segment 830 * @adapter: Target I2C bus segment 831 * @flags: I2C_LOCK_ROOT_ADAPTER unlocks the root i2c adapter, I2C_LOCK_SEGMENT 832 * unlocks only this branch in the adapter tree 833 */ 834 static inline void i2c_unlock_bus(struct i2c_adapter * adapter,unsigned int flags)835 i2c_unlock_bus(struct i2c_adapter *adapter, unsigned int flags) 836 { 837 adapter->lock_ops->unlock_bus(adapter, flags); 838 } 839 840 /** 841 * i2c_mark_adapter_suspended - Report suspended state of the adapter to the core 842 * @adap: Adapter to mark as suspended 843 * 844 * When using this helper to mark an adapter as suspended, the core will reject 845 * further transfers to this adapter. The usage of this helper is optional but 846 * recommended for devices having distinct handlers for system suspend and 847 * runtime suspend. More complex devices are free to implement custom solutions 848 * to reject transfers when suspended. 849 */ i2c_mark_adapter_suspended(struct i2c_adapter * adap)850 static inline void i2c_mark_adapter_suspended(struct i2c_adapter *adap) 851 { 852 i2c_lock_bus(adap, I2C_LOCK_ROOT_ADAPTER); 853 set_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags); 854 i2c_unlock_bus(adap, I2C_LOCK_ROOT_ADAPTER); 855 } 856 857 /** 858 * i2c_mark_adapter_resumed - Report resumed state of the adapter to the core 859 * @adap: Adapter to mark as resumed 860 * 861 * When using this helper to mark an adapter as resumed, the core will allow 862 * further transfers to this adapter. See also further notes to 863 * @i2c_mark_adapter_suspended(). 864 */ i2c_mark_adapter_resumed(struct i2c_adapter * adap)865 static inline void i2c_mark_adapter_resumed(struct i2c_adapter *adap) 866 { 867 i2c_lock_bus(adap, I2C_LOCK_ROOT_ADAPTER); 868 clear_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags); 869 i2c_unlock_bus(adap, I2C_LOCK_ROOT_ADAPTER); 870 } 871 872 /* i2c adapter classes (bitmask) */ 873 #define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */ 874 /* Warn users that the adapter doesn't support classes anymore */ 875 #define I2C_CLASS_DEPRECATED (1<<8) 876 877 /* Internal numbers to terminate lists */ 878 #define I2C_CLIENT_END 0xfffeU 879 880 /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */ 881 #define I2C_ADDRS(addr, addrs...) \ 882 ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END }) 883 884 885 /* ----- functions exported by i2c.o */ 886 887 /* administration... 888 */ 889 #if IS_ENABLED(CONFIG_I2C) 890 int i2c_add_adapter(struct i2c_adapter *adap); 891 int devm_i2c_add_adapter(struct device *dev, struct i2c_adapter *adapter); 892 void i2c_del_adapter(struct i2c_adapter *adap); 893 int i2c_add_numbered_adapter(struct i2c_adapter *adap); 894 895 int i2c_register_driver(struct module *owner, struct i2c_driver *driver); 896 void i2c_del_driver(struct i2c_driver *driver); 897 898 /* use a define to avoid include chaining to get THIS_MODULE */ 899 #define i2c_add_driver(driver) \ 900 i2c_register_driver(THIS_MODULE, driver) 901 i2c_client_has_driver(struct i2c_client * client)902 static inline bool i2c_client_has_driver(struct i2c_client *client) 903 { 904 return !IS_ERR_OR_NULL(client) && client->dev.driver; 905 } 906 907 /* call the i2c_client->command() of all attached clients with 908 * the given arguments */ 909 void i2c_clients_command(struct i2c_adapter *adap, 910 unsigned int cmd, void *arg); 911 912 struct i2c_adapter *i2c_get_adapter(int nr); 913 void i2c_put_adapter(struct i2c_adapter *adap); 914 unsigned int i2c_adapter_depth(struct i2c_adapter *adapter); 915 916 void i2c_parse_fw_timings(struct device *dev, struct i2c_timings *t, bool use_defaults); 917 918 /* Return the functionality mask */ i2c_get_functionality(struct i2c_adapter * adap)919 static inline u32 i2c_get_functionality(struct i2c_adapter *adap) 920 { 921 return adap->algo->functionality(adap); 922 } 923 924 /* Return 1 if adapter supports everything we need, 0 if not. */ i2c_check_functionality(struct i2c_adapter * adap,u32 func)925 static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func) 926 { 927 return (func & i2c_get_functionality(adap)) == func; 928 } 929 930 /** 931 * i2c_check_quirks() - Function for checking the quirk flags in an i2c adapter 932 * @adap: i2c adapter 933 * @quirks: quirk flags 934 * 935 * Return: true if the adapter has all the specified quirk flags, false if not 936 */ i2c_check_quirks(struct i2c_adapter * adap,u64 quirks)937 static inline bool i2c_check_quirks(struct i2c_adapter *adap, u64 quirks) 938 { 939 if (!adap->quirks) 940 return false; 941 return (adap->quirks->flags & quirks) == quirks; 942 } 943 944 /* Return the adapter number for a specific adapter */ i2c_adapter_id(struct i2c_adapter * adap)945 static inline int i2c_adapter_id(struct i2c_adapter *adap) 946 { 947 return adap->nr; 948 } 949 i2c_8bit_addr_from_msg(const struct i2c_msg * msg)950 static inline u8 i2c_8bit_addr_from_msg(const struct i2c_msg *msg) 951 { 952 return (msg->addr << 1) | (msg->flags & I2C_M_RD); 953 } 954 955 u8 *i2c_get_dma_safe_msg_buf(struct i2c_msg *msg, unsigned int threshold); 956 void i2c_put_dma_safe_msg_buf(u8 *buf, struct i2c_msg *msg, bool xferred); 957 958 int i2c_handle_smbus_host_notify(struct i2c_adapter *adap, unsigned short addr); 959 /** 960 * module_i2c_driver() - Helper macro for registering a modular I2C driver 961 * @__i2c_driver: i2c_driver struct 962 * 963 * Helper macro for I2C drivers which do not do anything special in module 964 * init/exit. This eliminates a lot of boilerplate. Each module may only 965 * use this macro once, and calling it replaces module_init() and module_exit() 966 */ 967 #define module_i2c_driver(__i2c_driver) \ 968 module_driver(__i2c_driver, i2c_add_driver, \ 969 i2c_del_driver) 970 971 /** 972 * builtin_i2c_driver() - Helper macro for registering a builtin I2C driver 973 * @__i2c_driver: i2c_driver struct 974 * 975 * Helper macro for I2C drivers which do not do anything special in their 976 * init. This eliminates a lot of boilerplate. Each driver may only 977 * use this macro once, and calling it replaces device_initcall(). 978 */ 979 #define builtin_i2c_driver(__i2c_driver) \ 980 builtin_driver(__i2c_driver, i2c_add_driver) 981 982 /* must call put_device() when done with returned i2c_client device */ 983 struct i2c_client *i2c_find_device_by_fwnode(struct fwnode_handle *fwnode); 984 985 /* must call put_device() when done with returned i2c_adapter device */ 986 struct i2c_adapter *i2c_find_adapter_by_fwnode(struct fwnode_handle *fwnode); 987 988 /* must call i2c_put_adapter() when done with returned i2c_adapter device */ 989 struct i2c_adapter *i2c_get_adapter_by_fwnode(struct fwnode_handle *fwnode); 990 991 #else /* I2C */ 992 993 static inline struct i2c_client * i2c_find_device_by_fwnode(struct fwnode_handle * fwnode)994 i2c_find_device_by_fwnode(struct fwnode_handle *fwnode) 995 { 996 return NULL; 997 } 998 999 static inline struct i2c_adapter * i2c_find_adapter_by_fwnode(struct fwnode_handle * fwnode)1000 i2c_find_adapter_by_fwnode(struct fwnode_handle *fwnode) 1001 { 1002 return NULL; 1003 } 1004 1005 static inline struct i2c_adapter * i2c_get_adapter_by_fwnode(struct fwnode_handle * fwnode)1006 i2c_get_adapter_by_fwnode(struct fwnode_handle *fwnode) 1007 { 1008 return NULL; 1009 } 1010 1011 #endif /* !I2C */ 1012 1013 #if IS_ENABLED(CONFIG_OF) 1014 /* must call put_device() when done with returned i2c_client device */ of_find_i2c_device_by_node(struct device_node * node)1015 static inline struct i2c_client *of_find_i2c_device_by_node(struct device_node *node) 1016 { 1017 return i2c_find_device_by_fwnode(of_fwnode_handle(node)); 1018 } 1019 1020 /* must call put_device() when done with returned i2c_adapter device */ of_find_i2c_adapter_by_node(struct device_node * node)1021 static inline struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node) 1022 { 1023 return i2c_find_adapter_by_fwnode(of_fwnode_handle(node)); 1024 } 1025 1026 /* must call i2c_put_adapter() when done with returned i2c_adapter device */ of_get_i2c_adapter_by_node(struct device_node * node)1027 static inline struct i2c_adapter *of_get_i2c_adapter_by_node(struct device_node *node) 1028 { 1029 return i2c_get_adapter_by_fwnode(of_fwnode_handle(node)); 1030 } 1031 1032 const struct of_device_id 1033 *i2c_of_match_device(const struct of_device_id *matches, 1034 struct i2c_client *client); 1035 1036 int of_i2c_get_board_info(struct device *dev, struct device_node *node, 1037 struct i2c_board_info *info); 1038 1039 #else 1040 of_find_i2c_device_by_node(struct device_node * node)1041 static inline struct i2c_client *of_find_i2c_device_by_node(struct device_node *node) 1042 { 1043 return NULL; 1044 } 1045 of_find_i2c_adapter_by_node(struct device_node * node)1046 static inline struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node *node) 1047 { 1048 return NULL; 1049 } 1050 of_get_i2c_adapter_by_node(struct device_node * node)1051 static inline struct i2c_adapter *of_get_i2c_adapter_by_node(struct device_node *node) 1052 { 1053 return NULL; 1054 } 1055 1056 static inline const struct of_device_id i2c_of_match_device(const struct of_device_id * matches,struct i2c_client * client)1057 *i2c_of_match_device(const struct of_device_id *matches, 1058 struct i2c_client *client) 1059 { 1060 return NULL; 1061 } 1062 of_i2c_get_board_info(struct device * dev,struct device_node * node,struct i2c_board_info * info)1063 static inline int of_i2c_get_board_info(struct device *dev, 1064 struct device_node *node, 1065 struct i2c_board_info *info) 1066 { 1067 return -ENOTSUPP; 1068 } 1069 1070 #endif /* CONFIG_OF */ 1071 1072 struct acpi_resource; 1073 struct acpi_resource_i2c_serialbus; 1074 1075 #if IS_REACHABLE(CONFIG_ACPI) && IS_REACHABLE(CONFIG_I2C) 1076 bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares, 1077 struct acpi_resource_i2c_serialbus **i2c); 1078 int i2c_acpi_client_count(struct acpi_device *adev); 1079 u32 i2c_acpi_find_bus_speed(struct device *dev); 1080 struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode, 1081 int index, 1082 struct i2c_board_info *info); 1083 struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle); 1084 bool i2c_acpi_waive_d0_probe(struct device *dev); 1085 #else i2c_acpi_get_i2c_resource(struct acpi_resource * ares,struct acpi_resource_i2c_serialbus ** i2c)1086 static inline bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares, 1087 struct acpi_resource_i2c_serialbus **i2c) 1088 { 1089 return false; 1090 } i2c_acpi_client_count(struct acpi_device * adev)1091 static inline int i2c_acpi_client_count(struct acpi_device *adev) 1092 { 1093 return 0; 1094 } i2c_acpi_find_bus_speed(struct device * dev)1095 static inline u32 i2c_acpi_find_bus_speed(struct device *dev) 1096 { 1097 return 0; 1098 } i2c_acpi_new_device_by_fwnode(struct fwnode_handle * fwnode,int index,struct i2c_board_info * info)1099 static inline struct i2c_client *i2c_acpi_new_device_by_fwnode( 1100 struct fwnode_handle *fwnode, int index, 1101 struct i2c_board_info *info) 1102 { 1103 return ERR_PTR(-ENODEV); 1104 } i2c_acpi_find_adapter_by_handle(acpi_handle handle)1105 static inline struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) 1106 { 1107 return NULL; 1108 } i2c_acpi_waive_d0_probe(struct device * dev)1109 static inline bool i2c_acpi_waive_d0_probe(struct device *dev) 1110 { 1111 return false; 1112 } 1113 #endif /* CONFIG_ACPI */ 1114 i2c_acpi_new_device(struct device * dev,int index,struct i2c_board_info * info)1115 static inline struct i2c_client *i2c_acpi_new_device(struct device *dev, 1116 int index, 1117 struct i2c_board_info *info) 1118 { 1119 return i2c_acpi_new_device_by_fwnode(dev_fwnode(dev), index, info); 1120 } 1121 1122 #endif /* _LINUX_I2C_H */ 1123