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[linux-2.6-block.git] / include / linux / i2c.h
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1da177e4 1/* ------------------------------------------------------------------------- */
438d6c2c 2/* */
1da177e4 3/* i2c.h - definitions for the i2c-bus interface */
438d6c2c 4/* */
1da177e4
LT		 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
a1b9298e 23/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and
1da177e4
LT		 24 Frodo Looijaard <frodol@dds.nl> */
25
1da177e4
LT		 26#ifndef _LINUX_I2C_H
27#define _LINUX_I2C_H
28
1da177e4 29#include <linux/types.h>
438d6c2c 30#ifdef __KERNEL__
a1b9298e 31#include <linux/module.h>
1da177e4 32#include <linux/i2c-id.h>
a9d1b24d 33#include <linux/mod_devicetable.h>
1da177e4 34#include <linux/device.h> /* for struct device */
4e57b681 35#include <linux/sched.h> /* for completion */
5c085d36 36#include <linux/mutex.h>
1da177e4
LT		 37
38/* --- General options ------------------------------------------------ */
39
40struct i2c_msg;
41struct i2c_algorithm;
42struct i2c_adapter;
43struct i2c_client;
44struct i2c_driver;
1da177e4
LT		 45union i2c_smbus_data;
46
47/*
48 * The master routines are the ones normally used to transmit data to devices
438d6c2c
DB		 49 * on a bus (or read from them). Apart from two basic transfer functions to
50 * transmit one message at a time, a more complex version can be used to
1da177e4
LT		 51 * transmit an arbitrary number of messages without interruption.
52 */
53extern int i2c_master_send(struct i2c_client *,const char* ,int);
54extern int i2c_master_recv(struct i2c_client *,char* ,int);
55
56/* Transfer num messages.
57 */
58extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num);
59
1da177e4
LT		 60
61/* This is the very generalized SMBus access routine. You probably do not
62 want to use this, though; one of the functions below may be much easier,
438d6c2c 63 and probably just as fast.
1da177e4
LT		 64 Note that we use i2c_adapter here, because you do not need a specific
65 smbus adapter to call this function. */
438d6c2c 66extern s32 i2c_smbus_xfer (struct i2c_adapter * adapter, u16 addr,
1da177e4
LT		 67 unsigned short flags,
68 char read_write, u8 command, int size,
69 union i2c_smbus_data * data);
70
71/* Now follow the 'nice' access routines. These also document the calling
72 conventions of smbus_access. */
73
74extern s32 i2c_smbus_write_quick(struct i2c_client * client, u8 value);
75extern s32 i2c_smbus_read_byte(struct i2c_client * client);
76extern s32 i2c_smbus_write_byte(struct i2c_client * client, u8 value);
77extern s32 i2c_smbus_read_byte_data(struct i2c_client * client, u8 command);
78extern s32 i2c_smbus_write_byte_data(struct i2c_client * client,
79 u8 command, u8 value);
80extern s32 i2c_smbus_read_word_data(struct i2c_client * client, u8 command);
81extern s32 i2c_smbus_write_word_data(struct i2c_client * client,
82 u8 command, u16 value);
b86a1bc8
JD		 83/* Returns the number of read bytes */
84extern s32 i2c_smbus_read_block_data(struct i2c_client *client,
85 u8 command, u8 *values);
1da177e4
LT		 86extern s32 i2c_smbus_write_block_data(struct i2c_client * client,
87 u8 command, u8 length,
46f5ed75 88 const u8 *values);
31ec5bc5 89/* Returns the number of read bytes */
1da177e4 90extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client * client,
4b2643d7 91 u8 command, u8 length, u8 *values);
21bbd691
JD		 92extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client * client,
93 u8 command, u8 length,
46f5ed75 94 const u8 *values);
1da177e4
LT		 95
96/*
97 * A driver is capable of handling one or more physical devices present on
98 * I2C adapters. This information is used to inform the driver of adapter
99 * events.
35d8b2e6
LR		 100 *
101 * The driver.owner field should be set to the module owner of this driver.
102 * The driver.name field should be set to the name of this driver.
1da177e4
LT		 103 */
104
105struct i2c_driver {
1da177e4
LT		 106 int id;
107 unsigned int class;
1da177e4
LT		 108
109 /* Notifies the driver that a new bus has appeared. This routine
110 * can be used by the driver to test if the bus meets its conditions
438d6c2c 111 * & seek for the presence of the chip(s) it supports. If found, it
1da177e4 112 * registers the client(s) that are on the bus to the i2c admin. via
7b4fbc50 113 * i2c_attach_client. (LEGACY I2C DRIVERS ONLY)
1da177e4
LT		 114 */
115 int (*attach_adapter)(struct i2c_adapter *);
116 int (*detach_adapter)(struct i2c_adapter *);
117
438d6c2c 118 /* tells the driver that a client is about to be deleted & gives it
1da177e4
LT		 119 * the chance to remove its private data. Also, if the client struct
120 * has been dynamically allocated by the driver in the function above,
7b4fbc50 121 * it must be freed here. (LEGACY I2C DRIVERS ONLY)
1da177e4
LT		 122 */
123 int (*detach_client)(struct i2c_client *);
f37dd80a 124
7b4fbc50
DB		 125 /* Standard driver model interfaces, for "new style" i2c drivers.
126 * With the driver model, device enumeration is NEVER done by drivers;
127 * it's done by infrastructure. (NEW STYLE DRIVERS ONLY)
128 */
129 int (*probe)(struct i2c_client *);
a1d9e6e4 130 int (*remove)(struct i2c_client *);
7b4fbc50 131
f37dd80a
DB		 132 /* driver model interfaces that don't relate to enumeration */
133 void (*shutdown)(struct i2c_client *);
134 int (*suspend)(struct i2c_client *, pm_message_t mesg);
135 int (*resume)(struct i2c_client *);
136
1da177e4
LT		 137 /* a ioctl like command that can be used to perform specific functions
138 * with the device.
139 */
140 int (*command)(struct i2c_client *client,unsigned int cmd, void *arg);
141
142 struct device_driver driver;
143 struct list_head list;
144};
145#define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
146
2096b956
DB		 147#define I2C_NAME_SIZE 20
148
149/**
150 * struct i2c_client - represent an I2C slave device
d64f73be
DB		 151 * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address;
152 * I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking
2096b956
DB		 153 * @addr: Address used on the I2C bus connected to the parent adapter.
154 * @name: Indicates the type of the device, usually a chip name that's
155 * generic enough to hide second-sourcing and compatible revisions.
d64f73be 156 * @adapter: manages the bus segment hosting this I2C device
aa3481d5
RD		 157 * @driver: device's driver, hence pointer to access routines
158 * @usage_count: counts current number of users of this client
2096b956 159 * @dev: Driver model device node for the slave.
d64f73be 160 * @irq: indicates the IRQ generated by this device (if any)
7b4fbc50
DB		 161 * @driver_name: Identifies new-style driver used with this device; also
162 * used as the module name for hotplug/coldplug modprobe support.
aa3481d5
RD		 163 * @list: list of active/busy clients
164 * @released: used to synchronize client releases & detaches and references
2096b956
DB		 165 *
166 * An i2c_client identifies a single device (i.e. chip) connected to an
d64f73be
DB		 167 * i2c bus. The behaviour exposed to Linux is defined by the driver
168 * managing the device.
1da177e4
LT		 169 */
170struct i2c_client {
2096b956 171 unsigned short flags; /* div., see below */
438d6c2c 172 unsigned short addr; /* chip address - NOTE: 7bit */
1da177e4 173 /* addresses are stored in the */
5071860a 174 /* _LOWER_ 7 bits */
2096b956 175 char name[I2C_NAME_SIZE];
1da177e4
LT		 176 struct i2c_adapter *adapter; /* the adapter we sit on */
177 struct i2c_driver *driver; /* and our access routines */
178 int usage_count; /* How many accesses currently */
179 /* to the client */
180 struct device dev; /* the device structure */
9c1600ed 181 int irq; /* irq issued by device (or -1) */
7b4fbc50 182 char driver_name[KOBJ_NAME_LEN];
1da177e4 183 struct list_head list;
1da177e4
LT		 184 struct completion released;
185};
186#define to_i2c_client(d) container_of(d, struct i2c_client, dev)
187
a61fc683 188static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj)
189{
d75d53cd
MH		 190 struct device * const dev = container_of(kobj, struct device, kobj);
191 return to_i2c_client(dev);
a61fc683 192}
193
1da177e4
LT		 194static inline void *i2c_get_clientdata (struct i2c_client *dev)
195{
196 return dev_get_drvdata (&dev->dev);
197}
198
199static inline void i2c_set_clientdata (struct i2c_client *dev, void *data)
200{
201 dev_set_drvdata (&dev->dev, data);
202}
203
9c1600ed
DB		 204/**
205 * struct i2c_board_info - template for device creation
206 * @driver_name: identifies the driver to be bound to the device
207 * @type: optional chip type information, to initialize i2c_client.name
208 * @flags: to initialize i2c_client.flags
209 * @addr: stored in i2c_client.addr
210 * @platform_data: stored in i2c_client.dev.platform_data
211 * @irq: stored in i2c_client.irq
d64f73be 212 *
9c1600ed
DB		 213 * I2C doesn't actually support hardware probing, although controllers and
214 * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's
215 * a device at a given address. Drivers commonly need more information than
216 * that, such as chip type, configuration, associated IRQ, and so on.
217 *
218 * i2c_board_info is used to build tables of information listing I2C devices
219 * that are present. This information is used to grow the driver model tree
220 * for "new style" I2C drivers. For mainboards this is done statically using
d64f73be 221 * i2c_register_board_info(); bus numbers identify adapters that aren't
9c1600ed
DB		 222 * yet available. For add-on boards, i2c_new_device() does this dynamically
223 * with the adapter already known.
224 */
225struct i2c_board_info {
226 char driver_name[KOBJ_NAME_LEN];
227 char type[I2C_NAME_SIZE];
228 unsigned short flags;
229 unsigned short addr;
230 void *platform_data;
231 int irq;
232};
233
234/**
235 * I2C_BOARD_INFO - macro used to list an i2c device and its driver
236 * @driver: identifies the driver to use with the device
237 * @dev_addr: the device's address on the bus.
238 *
239 * This macro initializes essential fields of a struct i2c_board_info,
240 * declaring what has been provided on a particular board. Optional
241 * fields (such as the chip type, its associated irq, or device-specific
242 * platform_data) are provided using conventional syntax.
243 */
244#define I2C_BOARD_INFO(driver,dev_addr) \
245 .driver_name = (driver), .addr = (dev_addr)
246
247
248/* Add-on boards should register/unregister their devices; e.g. a board
249 * with integrated I2C, a config eeprom, sensors, and a codec that's
250 * used in conjunction with the primary hardware.
251 */
252extern struct i2c_client *
253i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info);
254
12b5053a
JD		 255/* If you don't know the exact address of an I2C device, use this variant
256 * instead, which can probe for device presence in a list of possible
257 * addresses.
258 */
259extern struct i2c_client *
260i2c_new_probed_device(struct i2c_adapter *adap,
261 struct i2c_board_info *info,
262 unsigned short const *addr_list);
263
9c1600ed
DB		 264extern void i2c_unregister_device(struct i2c_client *);
265
266/* Mainboard arch_initcall() code should register all its I2C devices.
267 * This is done at arch_initcall time, before declaring any i2c adapters.
268 * Modules for add-on boards must use other calls.
269 */
270extern int
271i2c_register_board_info(int busnum, struct i2c_board_info const *info, unsigned n);
272
273
1da177e4
LT		 274/*
275 * The following structs are for those who like to implement new bus drivers:
276 * i2c_algorithm is the interface to a class of hardware solutions which can
277 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
278 * to name two of the most common.
279 */
280struct i2c_algorithm {
1da177e4 281 /* If an adapter algorithm can't do I2C-level access, set master_xfer
438d6c2c 282 to NULL. If an adapter algorithm can do SMBus access, set
1da177e4
LT		 283 smbus_xfer. If set to NULL, the SMBus protocol is simulated
284 using common I2C messages */
8ced8eee
JD		 285 /* master_xfer should return the number of messages successfully
286 processed, or a negative value on error */
438d6c2c 287 int (*master_xfer)(struct i2c_adapter *adap,struct i2c_msg *msgs,
1da177e4 288 int num);
438d6c2c 289 int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr,
1da177e4
LT		 290 unsigned short flags, char read_write,
291 u8 command, int size, union i2c_smbus_data * data);
292
1da177e4
LT		 293 /* To determine what the adapter supports */
294 u32 (*functionality) (struct i2c_adapter *);
295};
296
297/*
298 * i2c_adapter is the structure used to identify a physical i2c bus along
299 * with the access algorithms necessary to access it.
300 */
301struct i2c_adapter {
302 struct module *owner;
020789e9 303 unsigned int id;
1da177e4 304 unsigned int class;
af71ff69 305 const struct i2c_algorithm *algo; /* the algorithm to access the bus */
1da177e4
LT		 306 void *algo_data;
307
308 /* --- administration stuff. */
309 int (*client_register)(struct i2c_client *);
310 int (*client_unregister)(struct i2c_client *);
311
312 /* data fields that are valid for all devices */
6ea23039 313 u8 level; /* nesting level for lockdep */
5c085d36
IM		 314 struct mutex bus_lock;
315 struct mutex clist_lock;
1da177e4
LT		 316
317 int timeout;
318 int retries;
319 struct device dev; /* the adapter device */
1da177e4 320
1da177e4
LT		 321 int nr;
322 struct list_head clients;
323 struct list_head list;
2096b956 324 char name[48];
1da177e4 325 struct completion dev_released;
1da177e4 326};
ef2c8321 327#define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
1da177e4
LT		 328
329static inline void *i2c_get_adapdata (struct i2c_adapter *dev)
330{
331 return dev_get_drvdata (&dev->dev);
332}
333
334static inline void i2c_set_adapdata (struct i2c_adapter *dev, void *data)
335{
336 dev_set_drvdata (&dev->dev, data);
337}
338
1da177e4 339/*flags for the client struct: */
3bbb835d
DB		 340#define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
341#define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */
342 /* Must equal I2C_M_TEN below */
343#define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */
1da177e4
LT		 344
345/* i2c adapter classes (bitmask) */
346#define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */
347#define I2C_CLASS_TV_ANALOG (1<<1) /* bttv + friends */
348#define I2C_CLASS_TV_DIGITAL (1<<2) /* dvb cards */
349#define I2C_CLASS_DDC (1<<3) /* i2c-matroxfb ? */
350#define I2C_CLASS_CAM_ANALOG (1<<4) /* camera with analog CCD */
351#define I2C_CLASS_CAM_DIGITAL (1<<5) /* most webcams */
352#define I2C_CLASS_SOUND (1<<6) /* sound devices */
353#define I2C_CLASS_ALL (UINT_MAX) /* all of the above */
354
355/* i2c_client_address_data is the struct for holding default client
356 * addresses for a driver and for the parameters supplied on the
357 * command line
358 */
359struct i2c_client_address_data {
360 unsigned short *normal_i2c;
1da177e4 361 unsigned short *probe;
1da177e4 362 unsigned short *ignore;
9fc6adfa 363 unsigned short **forces;
1da177e4
LT		 364};
365
366/* Internal numbers to terminate lists */
367#define I2C_CLIENT_END 0xfffeU
1da177e4
LT		 368
369/* The numbers to use to set I2C bus address */
370#define ANY_I2C_BUS 0xffff
1da177e4
LT		 371
372
373/* ----- functions exported by i2c.o */
374
375/* administration...
376 */
377extern int i2c_add_adapter(struct i2c_adapter *);
378extern int i2c_del_adapter(struct i2c_adapter *);
6e13e641 379extern int i2c_add_numbered_adapter(struct i2c_adapter *);
1da177e4 380
de59cf9e 381extern int i2c_register_driver(struct module *, struct i2c_driver *);
b3e82096 382extern void i2c_del_driver(struct i2c_driver *);
1da177e4 383
de59cf9e
GKH		 384static inline int i2c_add_driver(struct i2c_driver *driver)
385{
386 return i2c_register_driver(THIS_MODULE, driver);
387}
388
1da177e4
LT		 389extern int i2c_attach_client(struct i2c_client *);
390extern int i2c_detach_client(struct i2c_client *);
391
482c788d
JD		 392/* Should be used to make sure that client-struct is valid and that it
393 is okay to access the i2c-client.
cf02df77 394 returns -ENODEV if client has gone in the meantime */
1da177e4
LT		 395extern int i2c_use_client(struct i2c_client *);
396extern int i2c_release_client(struct i2c_client *);
397
398/* call the i2c_client->command() of all attached clients with
399 * the given arguments */
400extern void i2c_clients_command(struct i2c_adapter *adap,
401 unsigned int cmd, void *arg);
402
403/* returns -EBUSY if address has been taken, 0 if not. Note that the only
404 other place at which this is called is within i2c_attach_client; so
405 you can cheat by simply not registering. Not recommended, of course! */
406extern int i2c_check_addr (struct i2c_adapter *adapter, int addr);
407
408/* Detect function. It iterates over all possible addresses itself.
409 * It will only call found_proc if some client is connected at the
410 * specific address (unless a 'force' matched);
411 */
438d6c2c 412extern int i2c_probe(struct i2c_adapter *adapter,
1da177e4
LT		 413 struct i2c_client_address_data *address_data,
414 int (*found_proc) (struct i2c_adapter *, int, int));
415
1da177e4
LT		 416extern struct i2c_adapter* i2c_get_adapter(int id);
417extern void i2c_put_adapter(struct i2c_adapter *adap);
418
419
420/* Return the functionality mask */
421static inline u32 i2c_get_functionality(struct i2c_adapter *adap)
422{
423 return adap->algo->functionality(adap);
424}
425
426/* Return 1 if adapter supports everything we need, 0 if not. */
427static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func)
428{
429 return (func & i2c_get_functionality(adap)) == func;
430}
431
cdcb1921
JD		 432/* Return id number for a specific adapter */
433static inline int i2c_adapter_id(struct i2c_adapter *adap)
434{
435 return adap->nr;
436}
a1b9298e 437#endif /* __KERNEL__ */
cdcb1921 438
a64ec07d
DB		 439/**
440 * struct i2c_msg - an I2C transaction segment beginning with START
441 * @addr: Slave address, either seven or ten bits. When this is a ten
442 * bit address, I2C_M_TEN must be set in @flags and the adapter
443 * must support I2C_FUNC_10BIT_ADDR.
444 * @flags: I2C_M_RD is handled by all adapters. No other flags may be
445 * provided unless the adapter exported the relevant I2C_FUNC_*
446 * flags through i2c_check_functionality().
447 * @len: Number of data bytes in @buf being read from or written to the
448 * I2C slave address. For read transactions where I2C_M_RECV_LEN
449 * is set, the caller guarantees that this buffer can hold up to
450 * 32 bytes in addition to the initial length byte sent by the
451 * slave (plus, if used, the SMBus PEC); and this value will be
452 * incremented by the number of block data bytes received.
453 * @buf: The buffer into which data is read, or from which it's written.
454 *
455 * An i2c_msg is the low level representation of one segment of an I2C
456 * transaction. It is visible to drivers in the @i2c_transfer() procedure,
457 * to userspace from i2c-dev, and to I2C adapter drivers through the
458 * @i2c_adapter.@master_xfer() method.
459 *
460 * Except when I2C "protocol mangling" is used, all I2C adapters implement
461 * the standard rules for I2C transactions. Each transaction begins with a
462 * START. That is followed by the slave address, and a bit encoding read
463 * versus write. Then follow all the data bytes, possibly including a byte
464 * with SMBus PEC. The transfer terminates with a NAK, or when all those
465 * bytes have been transferred and ACKed. If this is the last message in a
466 * group, it is followed by a STOP. Otherwise it is followed by the next
467 * @i2c_msg transaction segment, beginning with a (repeated) START.
468 *
469 * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then
470 * passing certain @flags may have changed those standard protocol behaviors.
471 * Those flags are only for use with broken/nonconforming slaves, and with
472 * adapters which are known to support the specific mangling options they
473 * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR).
1da177e4
LT		 474 */
475struct i2c_msg {
476 __u16 addr; /* slave address */
438d6c2c 477 __u16 flags;
a64ec07d
DB		 478#define I2C_M_TEN 0x0010 /* this is a ten bit chip address */
479#define I2C_M_RD 0x0001 /* read data, from slave to master */
480#define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */
481#define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */
482#define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */
483#define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */
484#define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */
438d6c2c
DB		 485 __u16 len; /* msg length */
486 __u8 *buf; /* pointer to msg data */
1da177e4
LT		 487};
488
489/* To determine what functionality is present */
490
491#define I2C_FUNC_I2C 0x00000001
492#define I2C_FUNC_10BIT_ADDR 0x00000002
493#define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_{REV_DIR_ADDR,NOSTART,..} */
494#define I2C_FUNC_SMBUS_HWPEC_CALC 0x00000008 /* SMBus 2.0 */
1da177e4 495#define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */
438d6c2c
DB		 496#define I2C_FUNC_SMBUS_QUICK 0x00010000
497#define I2C_FUNC_SMBUS_READ_BYTE 0x00020000
498#define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000
499#define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000
500#define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000
501#define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000
502#define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000
503#define I2C_FUNC_SMBUS_PROC_CALL 0x00800000
504#define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000
505#define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
1da177e4
LT		 506#define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */
507#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */
508#define I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 0x10000000 /* I2C-like block xfer */
509#define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2 0x20000000 /* w/ 2-byte reg. addr. */
1da177e4
LT		 510
511#define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \
512 I2C_FUNC_SMBUS_WRITE_BYTE)
513#define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \
514 I2C_FUNC_SMBUS_WRITE_BYTE_DATA)
515#define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \
516 I2C_FUNC_SMBUS_WRITE_WORD_DATA)
517#define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \
518 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)
519#define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \
520 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)
521#define I2C_FUNC_SMBUS_I2C_BLOCK_2 (I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 | \
522 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2)
1da177e4
LT		 523
524#define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \
525 I2C_FUNC_SMBUS_BYTE | \
526 I2C_FUNC_SMBUS_BYTE_DATA | \
527 I2C_FUNC_SMBUS_WORD_DATA | \
528 I2C_FUNC_SMBUS_PROC_CALL | \
529 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
1da177e4
LT		 530 I2C_FUNC_SMBUS_I2C_BLOCK)
531
438d6c2c
DB		 532/*
533 * Data for SMBus Messages
1da177e4 534 */
438d6c2c 535#define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */
1da177e4
LT		 536union i2c_smbus_data {
537 __u8 byte;
538 __u16 word;
332bf92b 539 __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */
421ef47b 540 /* and one more for user-space compatibility */
1da177e4
LT		 541};
542
543/* smbus_access read or write markers */
544#define I2C_SMBUS_READ 1
545#define I2C_SMBUS_WRITE 0
546
438d6c2c 547/* SMBus transaction types (size parameter in the above functions)
1da177e4
LT		 548 Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
549#define I2C_SMBUS_QUICK 0
550#define I2C_SMBUS_BYTE 1
438d6c2c 551#define I2C_SMBUS_BYTE_DATA 2
1da177e4
LT		 552#define I2C_SMBUS_WORD_DATA 3
553#define I2C_SMBUS_PROC_CALL 4
554#define I2C_SMBUS_BLOCK_DATA 5
4b2643d7 555#define I2C_SMBUS_I2C_BLOCK_BROKEN 6
1da177e4 556#define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */
4b2643d7 557#define I2C_SMBUS_I2C_BLOCK_DATA 8
1da177e4
LT		 558
559
a1b9298e 560#ifdef __KERNEL__
1da177e4 561
1da177e4
LT		 562/* These defines are used for probing i2c client addresses */
563/* The length of the option lists */
564#define I2C_CLIENT_MAX_OPTS 48
565
566/* Default fill of many variables */
567#define I2C_CLIENT_DEFAULTS {I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
568 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
569 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
570 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
571 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
572 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
573 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
574 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
575 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
576 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
577 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
578 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
579 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
580 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
581 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
582 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END}
583
584/* I2C_CLIENT_MODULE_PARM creates a module parameter, and puts it in the
585 module header */
586
587#define I2C_CLIENT_MODULE_PARM(var,desc) \
588 static unsigned short var[I2C_CLIENT_MAX_OPTS] = I2C_CLIENT_DEFAULTS; \
589 static unsigned int var##_num; \
590 module_param_array(var, short, &var##_num, 0); \
591 MODULE_PARM_DESC(var,desc)
592
f4b50261
JD		 593#define I2C_CLIENT_MODULE_PARM_FORCE(name) \
594I2C_CLIENT_MODULE_PARM(force_##name, \
595 "List of adapter,address pairs which are " \
596 "unquestionably assumed to contain a `" \
597 # name "' chip")
598
599
600#define I2C_CLIENT_INSMOD_COMMON \
601I2C_CLIENT_MODULE_PARM(probe, "List of adapter,address pairs to scan " \
602 "additionally"); \
603I2C_CLIENT_MODULE_PARM(ignore, "List of adapter,address pairs not to " \
604 "scan"); \
605static struct i2c_client_address_data addr_data = { \
606 .normal_i2c = normal_i2c, \
607 .probe = probe, \
608 .ignore = ignore, \
609 .forces = forces, \
610}
611
612/* These are the ones you want to use in your own drivers. Pick the one
613 which matches the number of devices the driver differenciates between. */
1da177e4 614#define I2C_CLIENT_INSMOD \
1da177e4
LT		 615 I2C_CLIENT_MODULE_PARM(force, \
616 "List of adapter,address pairs to boldly assume " \
617 "to be present"); \
f4b50261 618 static unsigned short *forces[] = { \
9fc6adfa
JD		 619 force, \
620 NULL \
621 }; \
f4b50261
JD		 622I2C_CLIENT_INSMOD_COMMON
623
624#define I2C_CLIENT_INSMOD_1(chip1) \
625enum chips { any_chip, chip1 }; \
626I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to " \
627 "boldly assume to be present"); \
628I2C_CLIENT_MODULE_PARM_FORCE(chip1); \
629static unsigned short *forces[] = { force, force_##chip1, NULL }; \
630I2C_CLIENT_INSMOD_COMMON
631
632#define I2C_CLIENT_INSMOD_2(chip1, chip2) \
633enum chips { any_chip, chip1, chip2 }; \
634I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to " \
635 "boldly assume to be present"); \
636I2C_CLIENT_MODULE_PARM_FORCE(chip1); \
637I2C_CLIENT_MODULE_PARM_FORCE(chip2); \
638static unsigned short *forces[] = { force, force_##chip1, \
639 force_##chip2, NULL }; \
640I2C_CLIENT_INSMOD_COMMON
641
642#define I2C_CLIENT_INSMOD_3(chip1, chip2, chip3) \
643enum chips { any_chip, chip1, chip2, chip3 }; \
644I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to " \
645 "boldly assume to be present"); \
646I2C_CLIENT_MODULE_PARM_FORCE(chip1); \
647I2C_CLIENT_MODULE_PARM_FORCE(chip2); \
648I2C_CLIENT_MODULE_PARM_FORCE(chip3); \
649static unsigned short *forces[] = { force, force_##chip1, \
650 force_##chip2, force_##chip3, \
651 NULL }; \
652I2C_CLIENT_INSMOD_COMMON
653
654#define I2C_CLIENT_INSMOD_4(chip1, chip2, chip3, chip4) \
655enum chips { any_chip, chip1, chip2, chip3, chip4 }; \
656I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to " \
657 "boldly assume to be present"); \
658I2C_CLIENT_MODULE_PARM_FORCE(chip1); \
659I2C_CLIENT_MODULE_PARM_FORCE(chip2); \
660I2C_CLIENT_MODULE_PARM_FORCE(chip3); \
661I2C_CLIENT_MODULE_PARM_FORCE(chip4); \
662static unsigned short *forces[] = { force, force_##chip1, \
663 force_##chip2, force_##chip3, \
664 force_##chip4, NULL}; \
665I2C_CLIENT_INSMOD_COMMON
666
667#define I2C_CLIENT_INSMOD_5(chip1, chip2, chip3, chip4, chip5) \
668enum chips { any_chip, chip1, chip2, chip3, chip4, chip5 }; \
669I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to " \
670 "boldly assume to be present"); \
671I2C_CLIENT_MODULE_PARM_FORCE(chip1); \
672I2C_CLIENT_MODULE_PARM_FORCE(chip2); \
673I2C_CLIENT_MODULE_PARM_FORCE(chip3); \
674I2C_CLIENT_MODULE_PARM_FORCE(chip4); \
675I2C_CLIENT_MODULE_PARM_FORCE(chip5); \
676static unsigned short *forces[] = { force, force_##chip1, \
677 force_##chip2, force_##chip3, \
678 force_##chip4, force_##chip5, \
679 NULL }; \
680I2C_CLIENT_INSMOD_COMMON
681
682#define I2C_CLIENT_INSMOD_6(chip1, chip2, chip3, chip4, chip5, chip6) \
683enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6 }; \
684I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to " \
685 "boldly assume to be present"); \
686I2C_CLIENT_MODULE_PARM_FORCE(chip1); \
687I2C_CLIENT_MODULE_PARM_FORCE(chip2); \
688I2C_CLIENT_MODULE_PARM_FORCE(chip3); \
689I2C_CLIENT_MODULE_PARM_FORCE(chip4); \
690I2C_CLIENT_MODULE_PARM_FORCE(chip5); \
691I2C_CLIENT_MODULE_PARM_FORCE(chip6); \
692static unsigned short *forces[] = { force, force_##chip1, \
693 force_##chip2, force_##chip3, \
694 force_##chip4, force_##chip5, \
695 force_##chip6, NULL }; \
696I2C_CLIENT_INSMOD_COMMON
697
698#define I2C_CLIENT_INSMOD_7(chip1, chip2, chip3, chip4, chip5, chip6, chip7) \
699enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6, \
700 chip7 }; \
701I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to " \
702 "boldly assume to be present"); \
703I2C_CLIENT_MODULE_PARM_FORCE(chip1); \
704I2C_CLIENT_MODULE_PARM_FORCE(chip2); \
705I2C_CLIENT_MODULE_PARM_FORCE(chip3); \
706I2C_CLIENT_MODULE_PARM_FORCE(chip4); \
707I2C_CLIENT_MODULE_PARM_FORCE(chip5); \
708I2C_CLIENT_MODULE_PARM_FORCE(chip6); \
709I2C_CLIENT_MODULE_PARM_FORCE(chip7); \
710static unsigned short *forces[] = { force, force_##chip1, \
711 force_##chip2, force_##chip3, \
712 force_##chip4, force_##chip5, \
713 force_##chip6, force_##chip7, \
714 NULL }; \
715I2C_CLIENT_INSMOD_COMMON
716
717#define I2C_CLIENT_INSMOD_8(chip1, chip2, chip3, chip4, chip5, chip6, chip7, chip8) \
718enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6, \
719 chip7, chip8 }; \
720I2C_CLIENT_MODULE_PARM(force, "List of adapter,address pairs to " \
721 "boldly assume to be present"); \
722I2C_CLIENT_MODULE_PARM_FORCE(chip1); \
723I2C_CLIENT_MODULE_PARM_FORCE(chip2); \
724I2C_CLIENT_MODULE_PARM_FORCE(chip3); \
725I2C_CLIENT_MODULE_PARM_FORCE(chip4); \
726I2C_CLIENT_MODULE_PARM_FORCE(chip5); \
727I2C_CLIENT_MODULE_PARM_FORCE(chip6); \
728I2C_CLIENT_MODULE_PARM_FORCE(chip7); \
729I2C_CLIENT_MODULE_PARM_FORCE(chip8); \
730static unsigned short *forces[] = { force, force_##chip1, \
731 force_##chip2, force_##chip3, \
732 force_##chip4, force_##chip5, \
733 force_##chip6, force_##chip7, \
734 force_##chip8, NULL }; \
735I2C_CLIENT_INSMOD_COMMON
a1b9298e 736#endif /* __KERNEL__ */
1da177e4 737#endif /* _LINUX_I2C_H */
Linux 6.x block layer and io_uring tree(s)