i2c.h 29.9 KB
Newer Older
L
Linus Torvalds 已提交
1
/* ------------------------------------------------------------------------- */
D
David Brownell 已提交
2
/*									     */
L
Linus Torvalds 已提交
3
/* i2c.h - definitions for the i2c-bus interface			     */
D
David Brownell 已提交
4
/*									     */
L
Linus Torvalds 已提交
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
/* ------------------------------------------------------------------------- */
/*   Copyright (C) 1995-2000 Simon G. Vogl

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.		     */
/* ------------------------------------------------------------------------- */

23
/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
L
Linus Torvalds 已提交
24 25 26 27 28 29
   Frodo Looijaard <frodol@dds.nl> */

#ifndef _LINUX_I2C_H
#define _LINUX_I2C_H

#include <linux/types.h>
D
David Brownell 已提交
30
#ifdef __KERNEL__
31
#include <linux/module.h>
L
Linus Torvalds 已提交
32
#include <linux/i2c-id.h>
33
#include <linux/mod_devicetable.h>
L
Linus Torvalds 已提交
34
#include <linux/device.h>	/* for struct device */
T
Tim Schmielau 已提交
35
#include <linux/sched.h>	/* for completion */
36
#include <linux/mutex.h>
L
Linus Torvalds 已提交
37

J
Jon Smirl 已提交
38 39
extern struct bus_type i2c_bus_type;

L
Linus Torvalds 已提交
40 41 42 43 44 45 46 47
/* --- General options ------------------------------------------------	*/

struct i2c_msg;
struct i2c_algorithm;
struct i2c_adapter;
struct i2c_client;
struct i2c_driver;
union i2c_smbus_data;
48
struct i2c_board_info;
L
Linus Torvalds 已提交
49 50 51

/*
 * The master routines are the ones normally used to transmit data to devices
D
David Brownell 已提交
52 53
 * on a bus (or read from them). Apart from two basic transfer functions to
 * transmit one message at a time, a more complex version can be used to
L
Linus Torvalds 已提交
54 55 56 57 58 59 60 61 62 63 64 65
 * transmit an arbitrary number of messages without interruption.
 */
extern int i2c_master_send(struct i2c_client *,const char* ,int);
extern int i2c_master_recv(struct i2c_client *,char* ,int);

/* Transfer num messages.
 */
extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);


/* This is the very generalized SMBus access routine. You probably do not
   want to use this, though; one of the functions below may be much easier,
D
David Brownell 已提交
66
   and probably just as fast.
L
Linus Torvalds 已提交
67 68
   Note that we use i2c_adapter here, because you do not need a specific
   smbus adapter to call this function. */
D
David Brownell 已提交
69
extern s32 i2c_smbus_xfer (struct i2c_adapter * adapter, u16 addr,
L
Linus Torvalds 已提交
70 71 72 73 74
                           unsigned short flags,
                           char read_write, u8 command, int size,
                           union i2c_smbus_data * data);

/* Now follow the 'nice' access routines. These also document the calling
75
   conventions of i2c_smbus_xfer. */
L
Linus Torvalds 已提交
76 77 78 79 80 81 82 83 84

extern s32 i2c_smbus_read_byte(struct i2c_client * client);
extern s32 i2c_smbus_write_byte(struct i2c_client * client, u8 value);
extern s32 i2c_smbus_read_byte_data(struct i2c_client * client, u8 command);
extern s32 i2c_smbus_write_byte_data(struct i2c_client * client,
                                     u8 command, u8 value);
extern s32 i2c_smbus_read_word_data(struct i2c_client * client, u8 command);
extern s32 i2c_smbus_write_word_data(struct i2c_client * client,
                                     u8 command, u16 value);
85 86 87
/* Returns the number of read bytes */
extern s32 i2c_smbus_read_block_data(struct i2c_client *client,
				     u8 command, u8 *values);
L
Linus Torvalds 已提交
88 89
extern s32 i2c_smbus_write_block_data(struct i2c_client * client,
				      u8 command, u8 length,
90
				      const u8 *values);
91
/* Returns the number of read bytes */
L
Linus Torvalds 已提交
92
extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client * client,
93
					 u8 command, u8 length, u8 *values);
94 95
extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client * client,
					  u8 command, u8 length,
96
					  const u8 *values);
L
Linus Torvalds 已提交
97

98 99 100 101 102 103
/**
 * struct i2c_driver - represent an I2C device driver
 * @class: What kind of i2c device we instantiate (for detect)
 * @detect: Callback for device detection
 * @address_data: The I2C addresses to probe, ignore or force (for detect)
 * @clients: List of detected clients we created (for i2c-core use only)
104 105 106
 *
 * The driver.owner field should be set to the module owner of this driver.
 * The driver.name field should be set to the name of this driver.
107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123
 *
 * For automatic device detection, both @detect and @address_data must
 * be defined. @class should also be set, otherwise only devices forced
 * with module parameters will be created. The detect function must
 * fill at least the name field of the i2c_board_info structure it is
 * handed upon successful detection, and possibly also the flags field.
 *
 * If @detect is missing, the driver will still work fine for enumerated
 * devices. Detected devices simply won't be supported. This is expected
 * for the many I2C/SMBus devices which can't be detected reliably, and
 * the ones which can always be enumerated in practice.
 *
 * The i2c_client structure which is handed to the @detect callback is
 * not a real i2c_client. It is initialized just enough so that you can
 * call i2c_smbus_read_byte_data and friends on it. Don't do anything
 * else with it. In particular, calling dev_dbg and friends on it is
 * not allowed.
L
Linus Torvalds 已提交
124 125 126 127 128 129 130
 */
struct i2c_driver {
	int id;
	unsigned int class;

	/* Notifies the driver that a new bus has appeared. This routine
	 * can be used by the driver to test if the bus meets its conditions
D
David Brownell 已提交
131
	 * & seek for the presence of the chip(s) it supports. If found, it
L
Linus Torvalds 已提交
132
	 * registers the client(s) that are on the bus to the i2c admin. via
D
David Brownell 已提交
133
	 * i2c_attach_client.  (LEGACY I2C DRIVERS ONLY)
L
Linus Torvalds 已提交
134 135 136 137
	 */
	int (*attach_adapter)(struct i2c_adapter *);
	int (*detach_adapter)(struct i2c_adapter *);

D
David Brownell 已提交
138
	/* tells the driver that a client is about to be deleted & gives it
L
Linus Torvalds 已提交
139 140
	 * the chance to remove its private data. Also, if the client struct
	 * has been dynamically allocated by the driver in the function above,
D
David Brownell 已提交
141
	 * it must be freed here.  (LEGACY I2C DRIVERS ONLY)
L
Linus Torvalds 已提交
142 143
	 */
	int (*detach_client)(struct i2c_client *);
144

D
David Brownell 已提交
145 146 147 148
	/* Standard driver model interfaces, for "new style" i2c drivers.
	 * With the driver model, device enumeration is NEVER done by drivers;
	 * it's done by infrastructure.  (NEW STYLE DRIVERS ONLY)
	 */
149
	int (*probe)(struct i2c_client *, const struct i2c_device_id *);
D
David Brownell 已提交
150
	int (*remove)(struct i2c_client *);
D
David Brownell 已提交
151

152 153 154 155 156
	/* driver model interfaces that don't relate to enumeration  */
	void (*shutdown)(struct i2c_client *);
	int (*suspend)(struct i2c_client *, pm_message_t mesg);
	int (*resume)(struct i2c_client *);

L
Linus Torvalds 已提交
157 158 159 160 161 162
	/* a ioctl like command that can be used to perform specific functions
	 * with the device.
	 */
	int (*command)(struct i2c_client *client,unsigned int cmd, void *arg);

	struct device_driver driver;
163
	const struct i2c_device_id *id_table;
164 165 166 167 168

	/* Device detection callback for automatic device creation */
	int (*detect)(struct i2c_client *, int kind, struct i2c_board_info *);
	const struct i2c_client_address_data *address_data;
	struct list_head clients;
L
Linus Torvalds 已提交
169 170 171
};
#define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)

D
David Brownell 已提交
172 173
/**
 * struct i2c_client - represent an I2C slave device
D
David Brownell 已提交
174 175
 * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address;
 *	I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking
D
David Brownell 已提交
176 177 178
 * @addr: Address used on the I2C bus connected to the parent adapter.
 * @name: Indicates the type of the device, usually a chip name that's
 *	generic enough to hide second-sourcing and compatible revisions.
D
David Brownell 已提交
179
 * @adapter: manages the bus segment hosting this I2C device
R
Randy Dunlap 已提交
180
 * @driver: device's driver, hence pointer to access routines
D
David Brownell 已提交
181
 * @dev: Driver model device node for the slave.
D
David Brownell 已提交
182
 * @irq: indicates the IRQ generated by this device (if any)
183
 * @list: list of active/busy clients (DEPRECATED)
184
 * @detected: member of an i2c_driver.clients list
R
Randy Dunlap 已提交
185
 * @released: used to synchronize client releases & detaches and references
D
David Brownell 已提交
186 187
 *
 * An i2c_client identifies a single device (i.e. chip) connected to an
D
David Brownell 已提交
188 189
 * i2c bus. The behaviour exposed to Linux is defined by the driver
 * managing the device.
L
Linus Torvalds 已提交
190 191
 */
struct i2c_client {
D
David Brownell 已提交
192
	unsigned short flags;		/* div., see below		*/
D
David Brownell 已提交
193
	unsigned short addr;		/* chip address - NOTE: 7bit	*/
L
Linus Torvalds 已提交
194
					/* addresses are stored in the	*/
195
					/* _LOWER_ 7 bits		*/
D
David Brownell 已提交
196
	char name[I2C_NAME_SIZE];
L
Linus Torvalds 已提交
197 198 199
	struct i2c_adapter *adapter;	/* the adapter we sit on	*/
	struct i2c_driver *driver;	/* and our access routines	*/
	struct device dev;		/* the device structure		*/
200
	int irq;			/* irq issued by device		*/
201
	struct list_head list;		/* DEPRECATED */
202
	struct list_head detected;
L
Linus Torvalds 已提交
203 204 205 206
	struct completion released;
};
#define to_i2c_client(d) container_of(d, struct i2c_client, dev)

207 208
extern struct i2c_client *i2c_verify_client(struct device *dev);

209 210
static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
{
211 212
	struct device * const dev = container_of(kobj, struct device, kobj);
	return to_i2c_client(dev);
213 214
}

L
Linus Torvalds 已提交
215 216 217 218 219 220 221 222 223 224
static inline void *i2c_get_clientdata (struct i2c_client *dev)
{
	return dev_get_drvdata (&dev->dev);
}

static inline void i2c_set_clientdata (struct i2c_client *dev, void *data)
{
	dev_set_drvdata (&dev->dev, data);
}

225 226
/**
 * struct i2c_board_info - template for device creation
227
 * @type: chip type, to initialize i2c_client.name
228 229 230 231
 * @flags: to initialize i2c_client.flags
 * @addr: stored in i2c_client.addr
 * @platform_data: stored in i2c_client.dev.platform_data
 * @irq: stored in i2c_client.irq
D
David Brownell 已提交
232
 *
233 234 235 236 237 238 239 240
 * I2C doesn't actually support hardware probing, although controllers and
 * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's
 * a device at a given address.  Drivers commonly need more information than
 * that, such as chip type, configuration, associated IRQ, and so on.
 *
 * i2c_board_info is used to build tables of information listing I2C devices
 * that are present.  This information is used to grow the driver model tree
 * for "new style" I2C drivers.  For mainboards this is done statically using
D
David Brownell 已提交
241
 * i2c_register_board_info(); bus numbers identify adapters that aren't
242 243 244 245 246 247 248 249 250 251 252 253
 * yet available.  For add-on boards, i2c_new_device() does this dynamically
 * with the adapter already known.
 */
struct i2c_board_info {
	char		type[I2C_NAME_SIZE];
	unsigned short	flags;
	unsigned short	addr;
	void		*platform_data;
	int		irq;
};

/**
254 255
 * I2C_BOARD_INFO - macro used to list an i2c device and its address
 * @dev_type: identifies the device type
256 257 258 259
 * @dev_addr: the device's address on the bus.
 *
 * This macro initializes essential fields of a struct i2c_board_info,
 * declaring what has been provided on a particular board.  Optional
260 261
 * fields (such as associated irq, or device-specific platform_data)
 * are provided using conventional syntax.
262
 */
263 264
#define I2C_BOARD_INFO(dev_type,dev_addr) \
	.type = (dev_type), .addr = (dev_addr)
265 266 267 268 269 270 271 272 273


/* Add-on boards should register/unregister their devices; e.g. a board
 * with integrated I2C, a config eeprom, sensors, and a codec that's
 * used in conjunction with the primary hardware.
 */
extern struct i2c_client *
i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);

J
Jean Delvare 已提交
274 275 276 277 278 279 280 281 282
/* If you don't know the exact address of an I2C device, use this variant
 * instead, which can probe for device presence in a list of possible
 * addresses.
 */
extern struct i2c_client *
i2c_new_probed_device(struct i2c_adapter *adap,
		      struct i2c_board_info *info,
		      unsigned short const *addr_list);

283 284 285 286
/* For devices that use several addresses, use i2c_new_dummy() to make
 * client handles for the extra addresses.
 */
extern struct i2c_client *
J
Jean Delvare 已提交
287
i2c_new_dummy(struct i2c_adapter *adap, u16 address);
288

289 290 291 292 293 294
extern void i2c_unregister_device(struct i2c_client *);

/* Mainboard arch_initcall() code should register all its I2C devices.
 * This is done at arch_initcall time, before declaring any i2c adapters.
 * Modules for add-on boards must use other calls.
 */
295
#ifdef CONFIG_I2C_BOARDINFO
296 297
extern int
i2c_register_board_info(int busnum, struct i2c_board_info const *info, unsigned n);
298 299 300 301 302 303 304
#else
static inline int
i2c_register_board_info(int busnum, struct i2c_board_info const *info, unsigned n)
{
	return 0;
}
#endif
305

L
Linus Torvalds 已提交
306 307 308 309 310 311 312 313
/*
 * The following structs are for those who like to implement new bus drivers:
 * i2c_algorithm is the interface to a class of hardware solutions which can
 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
 * to name two of the most common.
 */
struct i2c_algorithm {
	/* If an adapter algorithm can't do I2C-level access, set master_xfer
D
David Brownell 已提交
314
	   to NULL. If an adapter algorithm can do SMBus access, set
L
Linus Torvalds 已提交
315 316
	   smbus_xfer. If set to NULL, the SMBus protocol is simulated
	   using common I2C messages */
317 318
	/* master_xfer should return the number of messages successfully
	   processed, or a negative value on error */
D
David Brownell 已提交
319
	int (*master_xfer)(struct i2c_adapter *adap,struct i2c_msg *msgs,
L
Linus Torvalds 已提交
320
	                   int num);
D
David Brownell 已提交
321
	int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr,
L
Linus Torvalds 已提交
322 323 324 325 326 327 328 329 330 331 332 333 334
	                   unsigned short flags, char read_write,
	                   u8 command, int size, union i2c_smbus_data * data);

	/* To determine what the adapter supports */
	u32 (*functionality) (struct i2c_adapter *);
};

/*
 * i2c_adapter is the structure used to identify a physical i2c bus along
 * with the access algorithms necessary to access it.
 */
struct i2c_adapter {
	struct module *owner;
335
	unsigned int id;
L
Linus Torvalds 已提交
336
	unsigned int class;
337
	const struct i2c_algorithm *algo; /* the algorithm to access the bus */
L
Linus Torvalds 已提交
338 339 340 341 342 343 344
	void *algo_data;

	/* --- administration stuff. */
	int (*client_register)(struct i2c_client *);
	int (*client_unregister)(struct i2c_client *);

	/* data fields that are valid for all devices	*/
345
	u8 level; 			/* nesting level for lockdep */
346 347
	struct mutex bus_lock;
	struct mutex clist_lock;
L
Linus Torvalds 已提交
348 349 350 351 352 353

	int timeout;
	int retries;
	struct device dev;		/* the adapter device */

	int nr;
354
	struct list_head clients;	/* DEPRECATED */
D
David Brownell 已提交
355
	char name[48];
L
Linus Torvalds 已提交
356 357
	struct completion dev_released;
};
358
#define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
L
Linus Torvalds 已提交
359 360 361 362 363 364 365 366 367 368 369 370

static inline void *i2c_get_adapdata (struct i2c_adapter *dev)
{
	return dev_get_drvdata (&dev->dev);
}

static inline void i2c_set_adapdata (struct i2c_adapter *dev, void *data)
{
	dev_set_drvdata (&dev->dev, data);
}

/*flags for the client struct: */
371 372 373 374
#define I2C_CLIENT_PEC	0x04		/* Use Packet Error Checking */
#define I2C_CLIENT_TEN	0x10		/* we have a ten bit chip address */
					/* Must equal I2C_M_TEN below */
#define I2C_CLIENT_WAKE	0x80		/* for board_info; true iff can wake */
L
Linus Torvalds 已提交
375 376 377 378 379

/* i2c adapter classes (bitmask) */
#define I2C_CLASS_HWMON		(1<<0)	/* lm_sensors, ... */
#define I2C_CLASS_TV_ANALOG	(1<<1)	/* bttv + friends */
#define I2C_CLASS_TV_DIGITAL	(1<<2)	/* dvb cards */
380
#define I2C_CLASS_DDC		(1<<3)	/* DDC bus on graphics adapters */
L
Linus Torvalds 已提交
381 382 383
#define I2C_CLASS_CAM_ANALOG	(1<<4)	/* camera with analog CCD */
#define I2C_CLASS_CAM_DIGITAL	(1<<5)	/* most webcams */
#define I2C_CLASS_SOUND		(1<<6)	/* sound devices */
384
#define I2C_CLASS_SPD		(1<<7)	/* SPD EEPROMs and similar */
L
Linus Torvalds 已提交
385 386 387 388 389 390 391
#define I2C_CLASS_ALL		(UINT_MAX) /* all of the above */

/* i2c_client_address_data is the struct for holding default client
 * addresses for a driver and for the parameters supplied on the
 * command line
 */
struct i2c_client_address_data {
392 393 394 395
	const unsigned short *normal_i2c;
	const unsigned short *probe;
	const unsigned short *ignore;
	const unsigned short * const *forces;
L
Linus Torvalds 已提交
396 397 398 399 400 401 402 403 404 405 406 407 408 409 410
};

/* Internal numbers to terminate lists */
#define I2C_CLIENT_END		0xfffeU

/* The numbers to use to set I2C bus address */
#define ANY_I2C_BUS		0xffff


/* ----- functions exported by i2c.o */

/* administration...
 */
extern int i2c_add_adapter(struct i2c_adapter *);
extern int i2c_del_adapter(struct i2c_adapter *);
411
extern int i2c_add_numbered_adapter(struct i2c_adapter *);
L
Linus Torvalds 已提交
412

413
extern int i2c_register_driver(struct module *, struct i2c_driver *);
414
extern void i2c_del_driver(struct i2c_driver *);
L
Linus Torvalds 已提交
415

416 417 418 419 420
static inline int i2c_add_driver(struct i2c_driver *driver)
{
	return i2c_register_driver(THIS_MODULE, driver);
}

L
Linus Torvalds 已提交
421 422 423
extern int i2c_attach_client(struct i2c_client *);
extern int i2c_detach_client(struct i2c_client *);

424 425
extern struct i2c_client *i2c_use_client(struct i2c_client *client);
extern void i2c_release_client(struct i2c_client *client);
L
Linus Torvalds 已提交
426 427 428 429 430 431 432 433 434 435

/* call the i2c_client->command() of all attached clients with
 * the given arguments */
extern void i2c_clients_command(struct i2c_adapter *adap,
				unsigned int cmd, void *arg);

/* Detect function. It iterates over all possible addresses itself.
 * It will only call found_proc if some client is connected at the
 * specific address (unless a 'force' matched);
 */
D
David Brownell 已提交
436
extern int i2c_probe(struct i2c_adapter *adapter,
437
		const struct i2c_client_address_data *address_data,
L
Linus Torvalds 已提交
438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455
		int (*found_proc) (struct i2c_adapter *, int, int));

extern struct i2c_adapter* i2c_get_adapter(int id);
extern void i2c_put_adapter(struct i2c_adapter *adap);


/* Return the functionality mask */
static inline u32 i2c_get_functionality(struct i2c_adapter *adap)
{
	return adap->algo->functionality(adap);
}

/* Return 1 if adapter supports everything we need, 0 if not. */
static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func)
{
	return (func & i2c_get_functionality(adap)) == func;
}

456 457 458 459 460
/* Return id number for a specific adapter */
static inline int i2c_adapter_id(struct i2c_adapter *adap)
{
	return adap->nr;
}
461
#endif /* __KERNEL__ */
462

D
David Brownell 已提交
463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497
/**
 * struct i2c_msg - an I2C transaction segment beginning with START
 * @addr: Slave address, either seven or ten bits.  When this is a ten
 *	bit address, I2C_M_TEN must be set in @flags and the adapter
 *	must support I2C_FUNC_10BIT_ADDR.
 * @flags: I2C_M_RD is handled by all adapters.  No other flags may be
 *	provided unless the adapter exported the relevant I2C_FUNC_*
 *	flags through i2c_check_functionality().
 * @len: Number of data bytes in @buf being read from or written to the
 *	I2C slave address.  For read transactions where I2C_M_RECV_LEN
 *	is set, the caller guarantees that this buffer can hold up to
 *	32 bytes in addition to the initial length byte sent by the
 *	slave (plus, if used, the SMBus PEC); and this value will be
 *	incremented by the number of block data bytes received.
 * @buf: The buffer into which data is read, or from which it's written.
 *
 * An i2c_msg is the low level representation of one segment of an I2C
 * transaction.  It is visible to drivers in the @i2c_transfer() procedure,
 * to userspace from i2c-dev, and to I2C adapter drivers through the
 * @i2c_adapter.@master_xfer() method.
 *
 * Except when I2C "protocol mangling" is used, all I2C adapters implement
 * the standard rules for I2C transactions.  Each transaction begins with a
 * START.  That is followed by the slave address, and a bit encoding read
 * versus write.  Then follow all the data bytes, possibly including a byte
 * with SMBus PEC.  The transfer terminates with a NAK, or when all those
 * bytes have been transferred and ACKed.  If this is the last message in a
 * group, it is followed by a STOP.  Otherwise it is followed by the next
 * @i2c_msg transaction segment, beginning with a (repeated) START.
 *
 * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then
 * passing certain @flags may have changed those standard protocol behaviors.
 * Those flags are only for use with broken/nonconforming slaves, and with
 * adapters which are known to support the specific mangling options they
 * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR).
L
Linus Torvalds 已提交
498 499 500
 */
struct i2c_msg {
	__u16 addr;	/* slave address			*/
D
David Brownell 已提交
501
	__u16 flags;
D
David Brownell 已提交
502 503 504 505 506 507 508
#define I2C_M_TEN		0x0010	/* this is a ten bit chip address */
#define I2C_M_RD		0x0001	/* read data, from slave to master */
#define I2C_M_NOSTART		0x4000	/* if I2C_FUNC_PROTOCOL_MANGLING */
#define I2C_M_REV_DIR_ADDR	0x2000	/* if I2C_FUNC_PROTOCOL_MANGLING */
#define I2C_M_IGNORE_NAK	0x1000	/* if I2C_FUNC_PROTOCOL_MANGLING */
#define I2C_M_NO_RD_ACK		0x0800	/* if I2C_FUNC_PROTOCOL_MANGLING */
#define I2C_M_RECV_LEN		0x0400	/* length will be first received byte */
D
David Brownell 已提交
509 510
	__u16 len;		/* msg length				*/
	__u8 *buf;		/* pointer to msg data			*/
L
Linus Torvalds 已提交
511 512 513 514 515 516 517
};

/* To determine what functionality is present */

#define I2C_FUNC_I2C			0x00000001
#define I2C_FUNC_10BIT_ADDR		0x00000002
#define I2C_FUNC_PROTOCOL_MANGLING	0x00000004 /* I2C_M_{REV_DIR_ADDR,NOSTART,..} */
518
#define I2C_FUNC_SMBUS_PEC		0x00000008
L
Linus Torvalds 已提交
519
#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL	0x00008000 /* SMBus 2.0 */
D
David Brownell 已提交
520 521 522 523 524 525 526 527 528 529
#define I2C_FUNC_SMBUS_QUICK		0x00010000
#define I2C_FUNC_SMBUS_READ_BYTE	0x00020000
#define I2C_FUNC_SMBUS_WRITE_BYTE	0x00040000
#define I2C_FUNC_SMBUS_READ_BYTE_DATA	0x00080000
#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA	0x00100000
#define I2C_FUNC_SMBUS_READ_WORD_DATA	0x00200000
#define I2C_FUNC_SMBUS_WRITE_WORD_DATA	0x00400000
#define I2C_FUNC_SMBUS_PROC_CALL	0x00800000
#define I2C_FUNC_SMBUS_READ_BLOCK_DATA	0x01000000
#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
L
Linus Torvalds 已提交
530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553
#define I2C_FUNC_SMBUS_READ_I2C_BLOCK	0x04000000 /* I2C-like block xfer  */
#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK	0x08000000 /* w/ 1-byte reg. addr. */
#define I2C_FUNC_SMBUS_READ_I2C_BLOCK_2	 0x10000000 /* I2C-like block xfer  */
#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2 0x20000000 /* w/ 2-byte reg. addr. */

#define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \
                             I2C_FUNC_SMBUS_WRITE_BYTE)
#define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \
                                  I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
#define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \
                                  I2C_FUNC_SMBUS_WRITE_WORD_DATA)
#define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \
                                   I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
#define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \
                                  I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
#define I2C_FUNC_SMBUS_I2C_BLOCK_2 (I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 | \
                                    I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2)

#define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \
                             I2C_FUNC_SMBUS_BYTE | \
                             I2C_FUNC_SMBUS_BYTE_DATA | \
                             I2C_FUNC_SMBUS_WORD_DATA | \
                             I2C_FUNC_SMBUS_PROC_CALL | \
                             I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
554 555
			     I2C_FUNC_SMBUS_I2C_BLOCK | \
			     I2C_FUNC_SMBUS_PEC)
L
Linus Torvalds 已提交
556

D
David Brownell 已提交
557 558
/*
 * Data for SMBus Messages
L
Linus Torvalds 已提交
559
 */
D
David Brownell 已提交
560
#define I2C_SMBUS_BLOCK_MAX	32	/* As specified in SMBus standard */
L
Linus Torvalds 已提交
561 562 563
union i2c_smbus_data {
	__u8 byte;
	__u16 word;
564
	__u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */
565
	                       /* and one more for user-space compatibility */
L
Linus Torvalds 已提交
566 567
};

568
/* i2c_smbus_xfer read or write markers */
L
Linus Torvalds 已提交
569 570 571
#define I2C_SMBUS_READ	1
#define I2C_SMBUS_WRITE	0

D
David Brownell 已提交
572
/* SMBus transaction types (size parameter in the above functions)
L
Linus Torvalds 已提交
573 574 575
   Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
#define I2C_SMBUS_QUICK		    0
#define I2C_SMBUS_BYTE		    1
D
David Brownell 已提交
576
#define I2C_SMBUS_BYTE_DATA	    2
L
Linus Torvalds 已提交
577 578 579
#define I2C_SMBUS_WORD_DATA	    3
#define I2C_SMBUS_PROC_CALL	    4
#define I2C_SMBUS_BLOCK_DATA	    5
580
#define I2C_SMBUS_I2C_BLOCK_BROKEN  6
L
Linus Torvalds 已提交
581
#define I2C_SMBUS_BLOCK_PROC_CALL   7		/* SMBus 2.0 */
582
#define I2C_SMBUS_I2C_BLOCK_DATA    8
L
Linus Torvalds 已提交
583 584


585
#ifdef __KERNEL__
L
Linus Torvalds 已提交
586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617

/* These defines are used for probing i2c client addresses */
/* The length of the option lists */
#define I2C_CLIENT_MAX_OPTS 48

/* Default fill of many variables */
#define I2C_CLIENT_DEFAULTS {I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
                          I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END}

/* I2C_CLIENT_MODULE_PARM creates a module parameter, and puts it in the
   module header */

#define I2C_CLIENT_MODULE_PARM(var,desc) \
  static unsigned short var[I2C_CLIENT_MAX_OPTS] = I2C_CLIENT_DEFAULTS; \
  static unsigned int var##_num; \
  module_param_array(var, short, &var##_num, 0); \
  MODULE_PARM_DESC(var,desc)

618 619 620 621 622 623 624 625 626 627 628 629
#define I2C_CLIENT_MODULE_PARM_FORCE(name)				\
I2C_CLIENT_MODULE_PARM(force_##name,					\
		       "List of adapter,address pairs which are "	\
		       "unquestionably assumed to contain a `"		\
		       # name "' chip")


#define I2C_CLIENT_INSMOD_COMMON					\
I2C_CLIENT_MODULE_PARM(probe, "List of adapter,address pairs to scan "	\
		       "additionally");					\
I2C_CLIENT_MODULE_PARM(ignore, "List of adapter,address pairs not to "	\
		       "scan");						\
630
static const struct i2c_client_address_data addr_data = {		\
631 632 633 634 635 636
	.normal_i2c	= normal_i2c,					\
	.probe		= probe,					\
	.ignore		= ignore,					\
	.forces		= forces,					\
}

637 638 639
#define I2C_CLIENT_FORCE_TEXT \
	"List of adapter,address pairs to boldly assume to be present"

640 641
/* These are the ones you want to use in your own drivers. Pick the one
   which matches the number of devices the driver differenciates between. */
642 643 644
#define I2C_CLIENT_INSMOD						\
I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);			\
static const unsigned short * const forces[] = { force, NULL };		\
645 646 647 648
I2C_CLIENT_INSMOD_COMMON

#define I2C_CLIENT_INSMOD_1(chip1)					\
enum chips { any_chip, chip1 };						\
649
I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);			\
650
I2C_CLIENT_MODULE_PARM_FORCE(chip1);					\
651 652
static const unsigned short * const forces[] =	{ force,		\
	force_##chip1, NULL };						\
653 654 655 656
I2C_CLIENT_INSMOD_COMMON

#define I2C_CLIENT_INSMOD_2(chip1, chip2)				\
enum chips { any_chip, chip1, chip2 };					\
657
I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);			\
658 659
I2C_CLIENT_MODULE_PARM_FORCE(chip1);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip2);					\
660 661
static const unsigned short * const forces[] =	{ force,		\
	force_##chip1, force_##chip2, NULL };				\
662 663 664 665
I2C_CLIENT_INSMOD_COMMON

#define I2C_CLIENT_INSMOD_3(chip1, chip2, chip3)			\
enum chips { any_chip, chip1, chip2, chip3 };				\
666
I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);			\
667 668 669
I2C_CLIENT_MODULE_PARM_FORCE(chip1);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip2);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip3);					\
670 671
static const unsigned short * const forces[] =	{ force,		\
	force_##chip1, force_##chip2, force_##chip3, NULL };		\
672 673 674 675
I2C_CLIENT_INSMOD_COMMON

#define I2C_CLIENT_INSMOD_4(chip1, chip2, chip3, chip4)			\
enum chips { any_chip, chip1, chip2, chip3, chip4 };			\
676
I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);			\
677 678 679 680
I2C_CLIENT_MODULE_PARM_FORCE(chip1);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip2);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip3);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip4);					\
681 682 683
static const unsigned short * const forces[] =	{ force,		\
	force_##chip1, force_##chip2, force_##chip3,			\
	force_##chip4, NULL};						\
684 685 686 687
I2C_CLIENT_INSMOD_COMMON

#define I2C_CLIENT_INSMOD_5(chip1, chip2, chip3, chip4, chip5)		\
enum chips { any_chip, chip1, chip2, chip3, chip4, chip5 };		\
688
I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);			\
689 690 691 692 693
I2C_CLIENT_MODULE_PARM_FORCE(chip1);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip2);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip3);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip4);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip5);					\
694 695 696
static const unsigned short * const forces[] = { force,			\
	force_##chip1, force_##chip2, force_##chip3,			\
	force_##chip4, force_##chip5, NULL };				\
697 698 699 700
I2C_CLIENT_INSMOD_COMMON

#define I2C_CLIENT_INSMOD_6(chip1, chip2, chip3, chip4, chip5, chip6)	\
enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6 };	\
701
I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);			\
702 703 704 705 706 707
I2C_CLIENT_MODULE_PARM_FORCE(chip1);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip2);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip3);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip4);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip5);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip6);					\
708 709 710
static const unsigned short * const forces[] = { force,			\
	force_##chip1, force_##chip2, force_##chip3,			\
	force_##chip4, force_##chip5, force_##chip6, NULL };		\
711 712 713 714 715
I2C_CLIENT_INSMOD_COMMON

#define I2C_CLIENT_INSMOD_7(chip1, chip2, chip3, chip4, chip5, chip6, chip7) \
enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6,	\
	     chip7 };							\
716
I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);			\
717 718 719 720 721 722 723
I2C_CLIENT_MODULE_PARM_FORCE(chip1);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip2);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip3);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip4);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip5);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip6);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip7);					\
724 725 726 727
static const unsigned short * const forces[] = { force,			\
	force_##chip1, force_##chip2, force_##chip3,			\
	force_##chip4, force_##chip5, force_##chip6,			\
	force_##chip7, NULL };						\
728 729 730 731 732
I2C_CLIENT_INSMOD_COMMON

#define I2C_CLIENT_INSMOD_8(chip1, chip2, chip3, chip4, chip5, chip6, chip7, chip8) \
enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6,	\
	     chip7, chip8 };						\
733
I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT);			\
734 735 736 737 738 739 740 741
I2C_CLIENT_MODULE_PARM_FORCE(chip1);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip2);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip3);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip4);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip5);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip6);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip7);					\
I2C_CLIENT_MODULE_PARM_FORCE(chip8);					\
742 743 744 745
static const unsigned short * const forces[] = { force,			\
	force_##chip1, force_##chip2, force_##chip3,			\
	force_##chip4, force_##chip5, force_##chip6,			\
	force_##chip7, force_##chip8, NULL };				\
746
I2C_CLIENT_INSMOD_COMMON
747
#endif /* __KERNEL__ */
L
Linus Torvalds 已提交
748
#endif /* _LINUX_I2C_H */