1/* ------------------------------------------------------------------------- */ 2/* */ 3/* i2c.h - definitions for the i2c-bus interface */ 4/* */ 5/* ------------------------------------------------------------------------- */ 6/* Copyright (C) 1995-2000 Simon G. Vogl 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ 21/* ------------------------------------------------------------------------- */ 22 23/* With some changes from Ky�sti M�lkki <kmalkki@cc.hut.fi> and 24 Frodo Looijaard <frodol@dds.nl> */ 25 26/* $Id: i2c.h,v 1.1.1.1 2008/10/15 03:29:27 james26_jang Exp $ */ 27 28#ifndef I2C_H 29#define I2C_H 30 31#define I2C_DATE "20010830" 32#define I2C_VERSION "2.6.1" 33 34#include <linux/i2c-id.h> /* id values of adapters et. al. */ 35#include <linux/types.h> 36 37 38struct i2c_msg; 39 40 41#ifdef __KERNEL__ 42 43/* --- Includes and compatibility declarations ------------------------ */ 44 45#include <linux/version.h> 46#ifndef KERNEL_VERSION 47#define KERNEL_VERSION(a,b,c) (((a) << 16) | ((b) << 8) | (c)) 48#endif 49 50#include <asm/page.h> /* for 2.2.xx */ 51#if LINUX_VERSION_CODE < KERNEL_VERSION(2,0,25) 52#include <linux/sched.h> 53#else 54#include <asm/semaphore.h> 55#endif 56#include <linux/config.h> 57 58/* --- General options ------------------------------------------------ */ 59 60#define I2C_ALGO_MAX 4 /* control memory consumption */ 61#define I2C_ADAP_MAX 16 62#define I2C_DRIVER_MAX 16 63#define I2C_CLIENT_MAX 32 64#define I2C_DUMMY_MAX 4 65 66struct i2c_algorithm; 67struct i2c_adapter; 68struct i2c_client; 69struct i2c_driver; 70struct i2c_client_address_data; 71union i2c_smbus_data; 72 73 74/* 75 * The master routines are the ones normally used to transmit data to devices 76 * on a bus (or read from them). Apart from two basic transfer functions to 77 * transmit one message at a time, a more complex version can be used to 78 * transmit an arbitrary number of messages without interruption. 79 */ 80extern int i2c_master_send(struct i2c_client *,const char* ,int); 81extern int i2c_master_recv(struct i2c_client *,char* ,int); 82 83/* Transfer num messages. 84 */ 85extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[],int num); 86 87/* 88 * Some adapter types (i.e. PCF 8584 based ones) may support slave behaviuor. 89 * This is not tested/implemented yet and will change in the future. 90 */ 91extern int i2c_slave_send(struct i2c_client *,char*,int); 92extern int i2c_slave_recv(struct i2c_client *,char*,int); 93 94 95 96/* This is the very generalized SMBus access routine. You probably do not 97 want to use this, though; one of the functions below may be much easier, 98 and probably just as fast. 99 Note that we use i2c_adapter here, because you do not need a specific 100 smbus adapter to call this function. */ 101extern s32 i2c_smbus_xfer (struct i2c_adapter * adapter, u16 addr, 102 unsigned short flags, 103 char read_write, u8 command, int size, 104 union i2c_smbus_data * data); 105 106/* Now follow the 'nice' access routines. These also document the calling 107 conventions of smbus_access. */ 108 109extern s32 i2c_smbus_write_quick(struct i2c_client * client, u8 value); 110extern s32 i2c_smbus_read_byte(struct i2c_client * client); 111extern s32 i2c_smbus_write_byte(struct i2c_client * client, u8 value); 112extern s32 i2c_smbus_read_byte_data(struct i2c_client * client, u8 command); 113extern s32 i2c_smbus_write_byte_data(struct i2c_client * client, 114 u8 command, u8 value); 115extern s32 i2c_smbus_read_word_data(struct i2c_client * client, u8 command); 116extern s32 i2c_smbus_write_word_data(struct i2c_client * client, 117 u8 command, u16 value); 118extern s32 i2c_smbus_process_call(struct i2c_client * client, 119 u8 command, u16 value); 120/* Returns the number of read bytes */ 121extern s32 i2c_smbus_read_block_data(struct i2c_client * client, 122 u8 command, u8 *values); 123extern s32 i2c_smbus_write_block_data(struct i2c_client * client, 124 u8 command, u8 length, 125 u8 *values); 126extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client * client, 127 u8 command, u8 length, 128 u8 *values); 129 130 131/* 132 * A driver is capable of handling one or more physical devices present on 133 * I2C adapters. This information is used to inform the driver of adapter 134 * events. 135 */ 136 137struct i2c_driver { 138 char name[32]; 139 int id; 140 unsigned int flags; /* div., see below */ 141 142 /* Notifies the driver that a new bus has appeared. This routine 143 * can be used by the driver to test if the bus meets its conditions 144 * & seek for the presence of the chip(s) it supports. If found, it 145 * registers the client(s) that are on the bus to the i2c admin. via 146 * i2c_attach_client. 147 */ 148 int (*attach_adapter)(struct i2c_adapter *); 149 150 /* tells the driver that a client is about to be deleted & gives it 151 * the chance to remove its private data. Also, if the client struct 152 * has been dynamically allocated by the driver in the function above, 153 * it must be freed here. 154 */ 155 int (*detach_client)(struct i2c_client *); 156 157 /* a ioctl like command that can be used to perform specific functions 158 * with the device. 159 */ 160 int (*command)(struct i2c_client *client,unsigned int cmd, void *arg); 161 162 /* These two are mainly used for bookkeeping & dynamic unloading of 163 * kernel modules. inc_use tells the driver that a client is being 164 * used by another module & that it should increase its ref. counter. 165 * dec_use is the inverse operation. 166 * NB: Make sure you have no circular dependencies, or else you get a 167 * deadlock when trying to unload the modules. 168 * You should use the i2c_{inc,dec}_use_client functions instead of 169 * calling this function directly. 170 */ 171 void (*inc_use)(struct i2c_client *client); 172 void (*dec_use)(struct i2c_client *client); 173}; 174 175/* 176 * i2c_client identifies a single device (i.e. chip) that is connected to an 177 * i2c bus. The behaviour is defined by the routines of the driver. This 178 * function is mainly used for lookup & other admin. functions. 179 */ 180struct i2c_client { 181 char name[32]; 182 int id; 183 unsigned int flags; /* div., see below */ 184 unsigned int addr; /* chip address - NOTE: 7bit */ 185 /* addresses are stored in the */ 186 /* _LOWER_ 7 bits of this char */ 187 /* addr: unsigned int to make lm_sensors i2c-isa adapter work 188 more cleanly. It does not take any more memory space, due to 189 alignment considerations */ 190 struct i2c_adapter *adapter; /* the adapter we sit on */ 191 struct i2c_driver *driver; /* and our access routines */ 192 void *data; /* for the clients */ 193 int usage_count; /* How many accesses currently */ 194 /* to the client */ 195}; 196 197 198/* 199 * The following structs are for those who like to implement new bus drivers: 200 * i2c_algorithm is the interface to a class of hardware solutions which can 201 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584 202 * to name two of the most common. 203 */ 204struct i2c_algorithm { 205 char name[32]; /* textual description */ 206 unsigned int id; 207 208 /* If an adapter algorithm can't to I2C-level access, set master_xfer 209 to NULL. If an adapter algorithm can do SMBus access, set 210 smbus_xfer. If set to NULL, the SMBus protocol is simulated 211 using common I2C messages */ 212 int (*master_xfer)(struct i2c_adapter *adap,struct i2c_msg msgs[], 213 int num); 214 int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr, 215 unsigned short flags, char read_write, 216 u8 command, int size, union i2c_smbus_data * data); 217 218 /* --- these optional/future use for some adapter types.*/ 219 int (*slave_send)(struct i2c_adapter *,char*,int); 220 int (*slave_recv)(struct i2c_adapter *,char*,int); 221 222 /* --- ioctl like call to set div. parameters. */ 223 int (*algo_control)(struct i2c_adapter *, unsigned int, unsigned long); 224 225 /* To determine what the adapter supports */ 226 u32 (*functionality) (struct i2c_adapter *); 227}; 228 229#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,29) 230struct proc_dir_entry; 231#endif 232 233/* 234 * i2c_adapter is the structure used to identify a physical i2c bus along 235 * with the access algorithms necessary to access it. 236 */ 237struct i2c_adapter { 238 char name[32]; /* some useful name to identify the adapter */ 239 unsigned int id;/* == is algo->id | hwdep.struct->id, */ 240 /* for registered values see below */ 241 struct i2c_algorithm *algo;/* the algorithm to access the bus */ 242 void *algo_data; 243 244 /* --- These may be NULL, but should increase the module use count */ 245 void (*inc_use)(struct i2c_adapter *); 246 void (*dec_use)(struct i2c_adapter *); 247 248 /* --- administration stuff. */ 249 int (*client_register)(struct i2c_client *); 250 int (*client_unregister)(struct i2c_client *); 251 252 void *data; /* private data for the adapter */ 253 /* some data fields that are used by all types */ 254 /* these data fields are readonly to the public */ 255 /* and can be set via the i2c_ioctl call */ 256 257 /* data fields that are valid for all devices */ 258 struct semaphore lock; 259 unsigned int flags;/* flags specifying div. data */ 260 261 struct i2c_client *clients[I2C_CLIENT_MAX]; 262 int client_count; 263 264 int timeout; 265 int retries; 266 267#ifdef CONFIG_PROC_FS 268 /* No need to set this when you initialize the adapter */ 269 int inode; 270#if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,29) 271 struct proc_dir_entry *proc_entry; 272#endif 273#endif /* def CONFIG_PROC_FS */ 274}; 275 276/*flags for the driver struct: */ 277#define I2C_DF_NOTIFY 0x01 /* notify on bus (de/a)ttaches */ 278#define I2C_DF_DUMMY 0x02 /* do not connect any clients */ 279 280/*flags for the client struct: */ 281#define I2C_CLIENT_ALLOW_USE 0x01 /* Client allows access */ 282#define I2C_CLIENT_ALLOW_MULTIPLE_USE 0x02 /* Allow multiple access-locks */ 283 /* on an i2c_client */ 284 285/* i2c_client_address_data is the struct for holding default client 286 * addresses for a driver and for the parameters supplied on the 287 * command line 288 */ 289struct i2c_client_address_data { 290 unsigned short *normal_i2c; 291 unsigned short *normal_i2c_range; 292 unsigned short *probe; 293 unsigned short *probe_range; 294 unsigned short *ignore; 295 unsigned short *ignore_range; 296 unsigned short *force; 297}; 298 299/* Internal numbers to terminate lists */ 300#define I2C_CLIENT_END 0xfffe 301 302/* The numbers to use to set I2C bus address */ 303#define ANY_I2C_BUS 0xffff 304 305/* The length of the option lists */ 306#define I2C_CLIENT_MAX_OPTS 48 307 308 309/* ----- functions exported by i2c.o */ 310 311/* administration... 312 */ 313extern int i2c_add_adapter(struct i2c_adapter *); 314extern int i2c_del_adapter(struct i2c_adapter *); 315 316extern int i2c_add_driver(struct i2c_driver *); 317extern int i2c_del_driver(struct i2c_driver *); 318 319extern int i2c_attach_client(struct i2c_client *); 320extern int i2c_detach_client(struct i2c_client *); 321 322/* Only call these if you grab a resource that makes unloading the 323 client and the adapter it is on completely impossible. Like when a 324 /proc directory is entered. */ 325extern void i2c_inc_use_client(struct i2c_client *); 326extern void i2c_dec_use_client(struct i2c_client *); 327 328/* New function: This is to get an i2c_client-struct for controlling the 329 client either by using i2c_control-function or having the 330 client-module export functions that can be used with the i2c_client 331 -struct. */ 332extern struct i2c_client *i2c_get_client(int driver_id, int adapter_id, 333 struct i2c_client *prev); 334 335/* Should be used with new function 336 extern struct i2c_client *i2c_get_client(int,int,struct i2c_client *); 337 to make sure that client-struct is valid and that it is okay to access 338 the i2c-client. 339 returns -EACCES if client doesn't allow use (default) 340 returns -EBUSY if client doesn't allow multiple use (default) and 341 usage_count >0 */ 342extern int i2c_use_client(struct i2c_client *); 343extern int i2c_release_client(struct i2c_client *); 344 345/* returns -EBUSY if address has been taken, 0 if not. Note that the only 346 other place at which this is called is within i2c_attach_client; so 347 you can cheat by simply not registering. Not recommended, of course! */ 348extern int i2c_check_addr (struct i2c_adapter *adapter, int addr); 349 350/* Detect function. It iterates over all possible addresses itself. 351 * It will only call found_proc if some client is connected at the 352 * specific address (unless a 'force' matched); 353 */ 354typedef int i2c_client_found_addr_proc (struct i2c_adapter *adapter, 355 int addr, unsigned short flags,int kind); 356 357extern int i2c_probe(struct i2c_adapter *adapter, 358 struct i2c_client_address_data *address_data, 359 i2c_client_found_addr_proc *found_proc); 360 361/* An ioctl like call to set div. parameters of the adapter. 362 */ 363extern int i2c_control(struct i2c_client *,unsigned int, unsigned long); 364 365/* This call returns a unique low identifier for each registered adapter, 366 * or -1 if the adapter was not registered. 367 */ 368extern int i2c_adapter_id(struct i2c_adapter *adap); 369 370 371 372/* Return the functionality mask */ 373extern u32 i2c_get_functionality (struct i2c_adapter *adap); 374 375/* Return 1 if adapter supports everything we need, 0 if not. */ 376extern int i2c_check_functionality (struct i2c_adapter *adap, u32 func); 377 378#endif /* __KERNEL__ */ 379 380/* 381 * I2C Message - used for pure i2c transaction, also from /dev interface 382 */ 383struct i2c_msg { 384 __u16 addr; /* slave address */ 385 unsigned short flags; 386#define I2C_M_TEN 0x10 /* we have a ten bit chip address */ 387#define I2C_M_RD 0x01 388#define I2C_M_NOSTART 0x4000 389#define I2C_M_REV_DIR_ADDR 0x2000 390 short len; /* msg length */ 391 char *buf; /* pointer to msg data */ 392}; 393 394/* To determine what functionality is present */ 395 396#define I2C_FUNC_I2C 0x00000001 397#define I2C_FUNC_10BIT_ADDR 0x00000002 398#define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_{REV_DIR_ADDR,NOSTART} */ 399#define I2C_FUNC_SMBUS_QUICK 0x00010000 400#define I2C_FUNC_SMBUS_READ_BYTE 0x00020000 401#define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000 402#define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000 403#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000 404#define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000 405#define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000 406#define I2C_FUNC_SMBUS_PROC_CALL 0x00800000 407#define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000 408#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 409#define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* New I2C-like block */ 410#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* transfer */ 411 412#define I2C_FUNC_SMBUS_BYTE I2C_FUNC_SMBUS_READ_BYTE | \ 413 I2C_FUNC_SMBUS_WRITE_BYTE 414#define I2C_FUNC_SMBUS_BYTE_DATA I2C_FUNC_SMBUS_READ_BYTE_DATA | \ 415 I2C_FUNC_SMBUS_WRITE_BYTE_DATA 416#define I2C_FUNC_SMBUS_WORD_DATA I2C_FUNC_SMBUS_READ_WORD_DATA | \ 417 I2C_FUNC_SMBUS_WRITE_WORD_DATA 418#define I2C_FUNC_SMBUS_BLOCK_DATA I2C_FUNC_SMBUS_READ_BLOCK_DATA | \ 419 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 420#define I2C_FUNC_SMBUS_I2C_BLOCK I2C_FUNC_SMBUS_READ_I2C_BLOCK | \ 421 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 422 423#define I2C_FUNC_SMBUS_EMUL I2C_FUNC_SMBUS_QUICK | \ 424 I2C_FUNC_SMBUS_BYTE | \ 425 I2C_FUNC_SMBUS_BYTE_DATA | \ 426 I2C_FUNC_SMBUS_WORD_DATA | \ 427 I2C_FUNC_SMBUS_PROC_CALL | \ 428 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 429 430/* 431 * Data for SMBus Messages 432 */ 433union i2c_smbus_data { 434 __u8 byte; 435 __u16 word; 436 __u8 block[33]; /* block[0] is used for length */ 437}; 438 439/* smbus_access read or write markers */ 440#define I2C_SMBUS_READ 1 441#define I2C_SMBUS_WRITE 0 442 443/* SMBus transaction types (size parameter in the above functions) 444 Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */ 445#define I2C_SMBUS_QUICK 0 446#define I2C_SMBUS_BYTE 1 447#define I2C_SMBUS_BYTE_DATA 2 448#define I2C_SMBUS_WORD_DATA 3 449#define I2C_SMBUS_PROC_CALL 4 450#define I2C_SMBUS_BLOCK_DATA 5 451#define I2C_SMBUS_I2C_BLOCK_DATA 6 452 453 454/* ----- commands for the ioctl like i2c_command call: 455 * note that additional calls are defined in the algorithm and hw 456 * dependent layers - these can be listed here, or see the 457 * corresponding header files. 458 */ 459 /* -> bit-adapter specific ioctls */ 460#define I2C_RETRIES 0x0701 /* number of times a device address */ 461 /* should be polled when not */ 462 /* acknowledging */ 463#define I2C_TIMEOUT 0x0702 /* set timeout - call with int */ 464 465 466/* this is for i2c-dev.c */ 467#define I2C_SLAVE 0x0703 /* Change slave address */ 468 /* Attn.: Slave address is 7 or 10 bits */ 469#define I2C_SLAVE_FORCE 0x0706 /* Change slave address */ 470 /* Attn.: Slave address is 7 or 10 bits */ 471 /* This changes the address, even if it */ 472 /* is already taken! */ 473#define I2C_TENBIT 0x0704 /* 0 for 7 bit addrs, != 0 for 10 bit */ 474 475#define I2C_FUNCS 0x0705 /* Get the adapter functionality */ 476#define I2C_RDWR 0x0707 /* Combined R/W transfer (one stop only)*/ 477 478#define I2C_SMBUS 0x0720 /* SMBus-level access */ 479 480/* ... algo-bit.c recognizes */ 481#define I2C_UDELAY 0x0705 /* set delay in microsecs between each */ 482 /* written byte (except address) */ 483#define I2C_MDELAY 0x0706 /* millisec delay between written bytes */ 484 485/* ----- I2C-DEV: char device interface stuff ------------------------- */ 486 487#define I2C_MAJOR 89 /* Device major number */ 488 489#ifdef __KERNEL__ 490 491# ifndef NULL 492# define NULL ( (void *) 0 ) 493# endif 494 495# ifndef ENODEV 496# include <asm/errno.h> 497# endif 498 499/* These defines are used for probing i2c client addresses */ 500/* Default fill of many variables */ 501#define I2C_CLIENT_DEFAULTS {I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ 502 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ 503 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ 504 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ 505 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ 506 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ 507 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ 508 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ 509 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ 510 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ 511 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ 512 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ 513 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ 514 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ 515 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ 516 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END} 517 518/* This is ugly. We need to evaluate I2C_CLIENT_MAX_OPTS before it is 519 stringified */ 520#define I2C_CLIENT_MODPARM_AUX1(x) "1-" #x "h" 521#define I2C_CLIENT_MODPARM_AUX(x) I2C_CLIENT_MODPARM_AUX1(x) 522#define I2C_CLIENT_MODPARM I2C_CLIENT_MODPARM_AUX(I2C_CLIENT_MAX_OPTS) 523 524/* I2C_CLIENT_MODULE_PARM creates a module parameter, and puts it in the 525 module header */ 526 527#define I2C_CLIENT_MODULE_PARM(var,desc) \ 528 static unsigned short var[I2C_CLIENT_MAX_OPTS] = I2C_CLIENT_DEFAULTS; \ 529 MODULE_PARM(var,I2C_CLIENT_MODPARM); \ 530 MODULE_PARM_DESC(var,desc) 531 532/* This is the one you want to use in your own modules */ 533#define I2C_CLIENT_INSMOD \ 534 I2C_CLIENT_MODULE_PARM(probe, \ 535 "List of adapter,address pairs to scan additionally"); \ 536 I2C_CLIENT_MODULE_PARM(probe_range, \ 537 "List of adapter,start-addr,end-addr triples to scan " \ 538 "additionally"); \ 539 I2C_CLIENT_MODULE_PARM(ignore, \ 540 "List of adapter,address pairs not to scan"); \ 541 I2C_CLIENT_MODULE_PARM(ignore_range, \ 542 "List of adapter,start-addr,end-addr triples not to " \ 543 "scan"); \ 544 I2C_CLIENT_MODULE_PARM(force, \ 545 "List of adapter,address pairs to boldly assume " \ 546 "to be present"); \ 547 static struct i2c_client_address_data addr_data = \ 548 {normal_i2c, normal_i2c_range, \ 549 probe, probe_range, \ 550 ignore, ignore_range, \ 551 force} 552 553/* Detect whether we are on the isa bus. If this returns true, all i2c 554 access will fail! */ 555#define i2c_is_isa_client(clientptr) \ 556 ((clientptr)->adapter->algo->id == I2C_ALGO_ISA) 557#define i2c_is_isa_adapter(adapptr) \ 558 ((adapptr)->algo->id == I2C_ALGO_ISA) 559 560#endif /* def __KERNEL__ */ 561#endif /* I2C_H */ 562