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 Kyösti Mälkki <kmalkki@cc.hut.fi> and
24 Frodo Looijaard <frodol@dds.nl> */
25
26 /* $Id: i2c.h,v 1.68 2003/01/21 08:08:16 kmalkki Exp $ */
27
28 #ifndef _LINUX_I2C_H
29 #define _LINUX_I2C_H
30
31 #include <linux/module.h>
32 #include <linux/types.h>
33 #include <linux/i2c-id.h>
34 #include <linux/device.h> /* for struct device */
35 #include <asm/semaphore.h>
36
37 /* --- General options ------------------------------------------------ */
38
39 struct i2c_msg;
40 struct i2c_algorithm;
41 struct i2c_adapter;
42 struct i2c_client;
43 struct i2c_driver;
44 struct i2c_client_address_data;
45 union i2c_smbus_data;
46
47 /*
48 * The master routines are the ones normally used to transmit data to devices
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
51 * transmit an arbitrary number of messages without interruption.
52 */
53 extern int i2c_master_send(struct i2c_client *,const char* ,int);
54 extern int i2c_master_recv(struct i2c_client *,char* ,int);
55
56 /* Transfer num messages.
57 */
58 extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[],int num);
59
60 /*
61 * Some adapter types (i.e. PCF 8584 based ones) may support slave behaviuor.
62 * This is not tested/implemented yet and will change in the future.
63 */
64 extern int i2c_slave_send(struct i2c_client *,char*,int);
65 extern int i2c_slave_recv(struct i2c_client *,char*,int);
66
67
68
69 /* This is the very generalized SMBus access routine. You probably do not
70 want to use this, though; one of the functions below may be much easier,
71 and probably just as fast.
72 Note that we use i2c_adapter here, because you do not need a specific
73 smbus adapter to call this function. */
74 extern s32 i2c_smbus_xfer (struct i2c_adapter * adapter, u16 addr,
75 unsigned short flags,
76 char read_write, u8 command, int size,
77 union i2c_smbus_data * data);
78
79 /* Now follow the 'nice' access routines. These also document the calling
80 conventions of smbus_access. */
81
82 extern s32 i2c_smbus_write_quick(struct i2c_client * client, u8 value);
83 extern s32 i2c_smbus_read_byte(struct i2c_client * client);
84 extern s32 i2c_smbus_write_byte(struct i2c_client * client, u8 value);
85 extern s32 i2c_smbus_read_byte_data(struct i2c_client * client, u8 command);
86 extern s32 i2c_smbus_write_byte_data(struct i2c_client * client,
87 u8 command, u8 value);
88 extern s32 i2c_smbus_read_word_data(struct i2c_client * client, u8 command);
89 extern s32 i2c_smbus_write_word_data(struct i2c_client * client,
90 u8 command, u16 value);
91 /* Returns the number of bytes transferred */
92 extern s32 i2c_smbus_write_block_data(struct i2c_client * client,
93 u8 command, u8 length,
94 u8 *values);
95 extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client * client,
96 u8 command, u8 *values);
97
98 /*
99 * A driver is capable of handling one or more physical devices present on
100 * I2C adapters. This information is used to inform the driver of adapter
101 * events.
102 */
103
104 struct i2c_driver {
105 struct module *owner;
106 char name[32];
107 int id;
108 unsigned int class;
109 unsigned int flags; /* div., see below */
110
111 /* Notifies the driver that a new bus has appeared. This routine
112 * can be used by the driver to test if the bus meets its conditions
113 * & seek for the presence of the chip(s) it supports. If found, it
114 * registers the client(s) that are on the bus to the i2c admin. via
115 * i2c_attach_client.
116 */
117 int (*attach_adapter)(struct i2c_adapter *);
118 int (*detach_adapter)(struct i2c_adapter *);
119
120 /* tells the driver that a client is about to be deleted & gives it
121 * the chance to remove its private data. Also, if the client struct
122 * has been dynamically allocated by the driver in the function above,
123 * it must be freed here.
124 */
125 int (*detach_client)(struct i2c_client *);
126
127 /* a ioctl like command that can be used to perform specific functions
128 * with the device.
129 */
130 int (*command)(struct i2c_client *client,unsigned int cmd, void *arg);
131
132 struct device_driver driver;
133 struct list_head list;
134 };
135 #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)
136
137 extern struct bus_type i2c_bus_type;
138
139 #define I2C_NAME_SIZE 50
140
141 /*
142 * i2c_client identifies a single device (i.e. chip) that is connected to an
143 * i2c bus. The behaviour is defined by the routines of the driver. This
144 * function is mainly used for lookup & other admin. functions.
145 */
146 struct i2c_client {
147 int id;
148 unsigned int flags; /* div., see below */
149 unsigned int addr; /* chip address - NOTE: 7bit */
150 /* addresses are stored in the */
151 /* _LOWER_ 7 bits of this char */
152 /* addr: unsigned int to make lm_sensors i2c-isa adapter work
153 more cleanly. It does not take any more memory space, due to
154 alignment considerations */
155 struct i2c_adapter *adapter; /* the adapter we sit on */
156 struct i2c_driver *driver; /* and our access routines */
157 int usage_count; /* How many accesses currently */
158 /* to the client */
159 struct device dev; /* the device structure */
160 struct list_head list;
161 char name[I2C_NAME_SIZE];
162 struct completion released;
163 };
164 #define to_i2c_client(d) container_of(d, struct i2c_client, dev)
165
166 static inline void *i2c_get_clientdata (struct i2c_client *dev)
167 {
168 return dev_get_drvdata (&dev->dev);
169 }
170
171 static inline void i2c_set_clientdata (struct i2c_client *dev, void *data)
172 {
173 dev_set_drvdata (&dev->dev, data);
174 }
175
176 #define I2C_DEVNAME(str) .name = str
177
178 static inline char *i2c_clientname(struct i2c_client *c)
179 {
180 return &c->name[0];
181 }
182
183 /*
184 * The following structs are for those who like to implement new bus drivers:
185 * i2c_algorithm is the interface to a class of hardware solutions which can
186 * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584
187 * to name two of the most common.
188 */
189 struct i2c_algorithm {
190 char name[32]; /* textual description */
191 unsigned int id;
192
193 /* If an adapter algorithm can't to I2C-level access, set master_xfer
194 to NULL. If an adapter algorithm can do SMBus access, set
195 smbus_xfer. If set to NULL, the SMBus protocol is simulated
196 using common I2C messages */
197 int (*master_xfer)(struct i2c_adapter *adap,struct i2c_msg msgs[],
198 int num);
199 int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr,
200 unsigned short flags, char read_write,
201 u8 command, int size, union i2c_smbus_data * data);
202
203 /* --- these optional/future use for some adapter types.*/
204 int (*slave_send)(struct i2c_adapter *,char*,int);
205 int (*slave_recv)(struct i2c_adapter *,char*,int);
206
207 /* --- ioctl like call to set div. parameters. */
208 int (*algo_control)(struct i2c_adapter *, unsigned int, unsigned long);
209
210 /* To determine what the adapter supports */
211 u32 (*functionality) (struct i2c_adapter *);
212 };
213
214 /*
215 * i2c_adapter is the structure used to identify a physical i2c bus along
216 * with the access algorithms necessary to access it.
217 */
218 struct i2c_adapter {
219 struct module *owner;
220 unsigned int id;/* == is algo->id | hwdep.struct->id, */
221 /* for registered values see below */
222 unsigned int class;
223 struct i2c_algorithm *algo;/* the algorithm to access the bus */
224 void *algo_data;
225
226 /* --- administration stuff. */
227 int (*client_register)(struct i2c_client *);
228 int (*client_unregister)(struct i2c_client *);
229
230 /* data fields that are valid for all devices */
231 struct semaphore bus_lock;
232 struct semaphore clist_lock;
233
234 int timeout;
235 int retries;
236 struct device dev; /* the adapter device */
237 struct class_device class_dev; /* the class device */
238
239 #ifdef CONFIG_PROC_FS
240 /* No need to set this when you initialize the adapter */
241 int inode;
242 #endif /* def CONFIG_PROC_FS */
243
244 int nr;
245 struct list_head clients;
246 struct list_head list;
247 char name[I2C_NAME_SIZE];
248 struct completion dev_released;
249 struct completion class_dev_released;
250 };
251 #define dev_to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
252 #define class_dev_to_i2c_adapter(d) container_of(d, struct i2c_adapter, class_dev)
253
254 static inline void *i2c_get_adapdata (struct i2c_adapter *dev)
255 {
256 return dev_get_drvdata (&dev->dev);
257 }
258
259 static inline void i2c_set_adapdata (struct i2c_adapter *dev, void *data)
260 {
261 dev_set_drvdata (&dev->dev, data);
262 }
263
264 /*flags for the driver struct: */
265 #define I2C_DF_NOTIFY 0x01 /* notify on bus (de/a)ttaches */
266 #if 0
267 /* this flag is gone -- there is a (optional) driver->detach_adapter
268 * callback now which can be used instead */
269 # define I2C_DF_DUMMY 0x02
270 #endif
271
272 /*flags for the client struct: */
273 #define I2C_CLIENT_ALLOW_USE 0x01 /* Client allows access */
274 #define I2C_CLIENT_ALLOW_MULTIPLE_USE 0x02 /* Allow multiple access-locks */
275 /* on an i2c_client */
276 #define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */
277 #define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */
278 /* Must equal I2C_M_TEN below */
279
280 /* i2c adapter classes (bitmask) */
281 #define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */
282 #define I2C_CLASS_TV_ANALOG (1<<1) /* bttv + friends */
283 #define I2C_CLASS_TV_DIGITAL (1<<2) /* dvb cards */
284 #define I2C_CLASS_DDC (1<<3) /* i2c-matroxfb ? */
285 #define I2C_CLASS_CAM_ANALOG (1<<4) /* camera with analog CCD */
286 #define I2C_CLASS_CAM_DIGITAL (1<<5) /* most webcams */
287 #define I2C_CLASS_SOUND (1<<6) /* sound devices */
288 #define I2C_CLASS_ALL (UINT_MAX) /* all of the above */
289
290 /* i2c_client_address_data is the struct for holding default client
291 * addresses for a driver and for the parameters supplied on the
292 * command line
293 */
294 struct i2c_client_address_data {
295 unsigned short *normal_i2c;
296 unsigned short *normal_i2c_range;
297 unsigned short *probe;
298 unsigned short *probe_range;
299 unsigned short *ignore;
300 unsigned short *ignore_range;
301 unsigned short *force;
302 };
303
304 /* Internal numbers to terminate lists */
305 #define I2C_CLIENT_END 0xfffe
306 #define I2C_CLIENT_ISA_END 0xfffefffe
307
308 /* The numbers to use to set I2C bus address */
309 #define ANY_I2C_BUS 0xffff
310 #define ANY_I2C_ISA_BUS 9191
311
312 /* The length of the option lists */
313 #define I2C_CLIENT_MAX_OPTS 48
314
315
316 /* ----- functions exported by i2c.o */
317
318 /* administration...
319 */
320 extern int i2c_add_adapter(struct i2c_adapter *);
321 extern int i2c_del_adapter(struct i2c_adapter *);
322
323 extern int i2c_add_driver(struct i2c_driver *);
324 extern int i2c_del_driver(struct i2c_driver *);
325
326 extern int i2c_attach_client(struct i2c_client *);
327 extern int i2c_detach_client(struct i2c_client *);
328
329 /* New function: This is to get an i2c_client-struct for controlling the
330 client either by using i2c_control-function or having the
331 client-module export functions that can be used with the i2c_client
332 -struct. */
333 extern struct i2c_client *i2c_get_client(int driver_id, int adapter_id,
334 struct i2c_client *prev);
335
336 /* Should be used with new function
337 extern struct i2c_client *i2c_get_client(int,int,struct i2c_client *);
338 to make sure that client-struct is valid and that it is okay to access
339 the i2c-client.
340 returns -EACCES if client doesn't allow use (default)
341 returns -EBUSY if client doesn't allow multiple use (default) and
342 usage_count >0 */
343 extern int i2c_use_client(struct i2c_client *);
344 extern int i2c_release_client(struct i2c_client *);
345
346 /* call the i2c_client->command() of all attached clients with
347 * the given arguments */
348 extern void i2c_clients_command(struct i2c_adapter *adap,
349 unsigned int cmd, void *arg);
350
351 /* returns -EBUSY if address has been taken, 0 if not. Note that the only
352 other place at which this is called is within i2c_attach_client; so
353 you can cheat by simply not registering. Not recommended, of course! */
354 extern int i2c_check_addr (struct i2c_adapter *adapter, int addr);
355
356 /* Detect function. It iterates over all possible addresses itself.
357 * It will only call found_proc if some client is connected at the
358 * specific address (unless a 'force' matched);
359 */
360 extern int i2c_probe(struct i2c_adapter *adapter,
361 struct i2c_client_address_data *address_data,
362 int (*found_proc) (struct i2c_adapter *, int, int));
363
364 /* An ioctl like call to set div. parameters of the adapter.
365 */
366 extern int i2c_control(struct i2c_client *,unsigned int, unsigned long);
367
368 /* This call returns a unique low identifier for each registered adapter,
369 * or -1 if the adapter was not registered.
370 */
371 extern int i2c_adapter_id(struct i2c_adapter *adap);
372 extern struct i2c_adapter* i2c_get_adapter(int id);
373 extern void i2c_put_adapter(struct i2c_adapter *adap);
374
375
376 /* Return the functionality mask */
377 extern u32 i2c_get_functionality (struct i2c_adapter *adap);
378
379 /* Return 1 if adapter supports everything we need, 0 if not. */
380 extern int i2c_check_functionality (struct i2c_adapter *adap, u32 func);
381
382 /*
383 * I2C Message - used for pure i2c transaction, also from /dev interface
384 */
385 struct i2c_msg {
386 __u16 addr; /* slave address */
387 __u16 flags;
388 #define I2C_M_TEN 0x10 /* we have a ten bit chip address */
389 #define I2C_M_RD 0x01
390 #define I2C_M_NOSTART 0x4000
391 #define I2C_M_REV_DIR_ADDR 0x2000
392 #define I2C_M_IGNORE_NAK 0x1000
393 #define I2C_M_NO_RD_ACK 0x0800
394 __u16 len; /* msg length */
395 __u8 *buf; /* pointer to msg data */
396 };
397
398 /* To determine what functionality is present */
399
400 #define I2C_FUNC_I2C 0x00000001
401 #define I2C_FUNC_10BIT_ADDR 0x00000002
402 #define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_{REV_DIR_ADDR,NOSTART,..} */
403 #define I2C_FUNC_SMBUS_HWPEC_CALC 0x00000008 /* SMBus 2.0 */
404 #define I2C_FUNC_SMBUS_READ_WORD_DATA_PEC 0x00000800 /* SMBus 2.0 */
405 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC 0x00001000 /* SMBus 2.0 */
406 #define I2C_FUNC_SMBUS_PROC_CALL_PEC 0x00002000 /* SMBus 2.0 */
407 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL_PEC 0x00004000 /* SMBus 2.0 */
408 #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */
409 #define I2C_FUNC_SMBUS_QUICK 0x00010000
410 #define I2C_FUNC_SMBUS_READ_BYTE 0x00020000
411 #define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000
412 #define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000
413 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000
414 #define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000
415 #define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000
416 #define I2C_FUNC_SMBUS_PROC_CALL 0x00800000
417 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000
418 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000
419 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */
420 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */
421 #define I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 0x10000000 /* I2C-like block xfer */
422 #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2 0x20000000 /* w/ 2-byte reg. addr. */
423 #define I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC 0x40000000 /* SMBus 2.0 */
424 #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC 0x80000000 /* SMBus 2.0 */
425
426 #define I2C_FUNC_SMBUS_BYTE I2C_FUNC_SMBUS_READ_BYTE | \
427 I2C_FUNC_SMBUS_WRITE_BYTE
428 #define I2C_FUNC_SMBUS_BYTE_DATA I2C_FUNC_SMBUS_READ_BYTE_DATA | \
429 I2C_FUNC_SMBUS_WRITE_BYTE_DATA
430 #define I2C_FUNC_SMBUS_WORD_DATA I2C_FUNC_SMBUS_READ_WORD_DATA | \
431 I2C_FUNC_SMBUS_WRITE_WORD_DATA
432 #define I2C_FUNC_SMBUS_BLOCK_DATA I2C_FUNC_SMBUS_READ_BLOCK_DATA | \
433 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA
434 #define I2C_FUNC_SMBUS_I2C_BLOCK I2C_FUNC_SMBUS_READ_I2C_BLOCK | \
435 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK
436 #define I2C_FUNC_SMBUS_I2C_BLOCK_2 I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 | \
437 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2
438 #define I2C_FUNC_SMBUS_BLOCK_DATA_PEC I2C_FUNC_SMBUS_READ_BLOCK_DATA_PEC | \
439 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC
440 #define I2C_FUNC_SMBUS_WORD_DATA_PEC I2C_FUNC_SMBUS_READ_WORD_DATA_PEC | \
441 I2C_FUNC_SMBUS_WRITE_WORD_DATA_PEC
442
443 #define I2C_FUNC_SMBUS_READ_BYTE_PEC I2C_FUNC_SMBUS_READ_BYTE_DATA
444 #define I2C_FUNC_SMBUS_WRITE_BYTE_PEC I2C_FUNC_SMBUS_WRITE_BYTE_DATA
445 #define I2C_FUNC_SMBUS_READ_BYTE_DATA_PEC I2C_FUNC_SMBUS_READ_WORD_DATA
446 #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA_PEC I2C_FUNC_SMBUS_WRITE_WORD_DATA
447 #define I2C_FUNC_SMBUS_BYTE_PEC I2C_FUNC_SMBUS_BYTE_DATA
448 #define I2C_FUNC_SMBUS_BYTE_DATA_PEC I2C_FUNC_SMBUS_WORD_DATA
449
450 #define I2C_FUNC_SMBUS_EMUL I2C_FUNC_SMBUS_QUICK | \
451 I2C_FUNC_SMBUS_BYTE | \
452 I2C_FUNC_SMBUS_BYTE_DATA | \
453 I2C_FUNC_SMBUS_WORD_DATA | \
454 I2C_FUNC_SMBUS_PROC_CALL | \
455 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \
456 I2C_FUNC_SMBUS_WRITE_BLOCK_DATA_PEC | \
457 I2C_FUNC_SMBUS_I2C_BLOCK
458
459 /*
460 * Data for SMBus Messages
461 */
462 #define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */
463 #define I2C_SMBUS_I2C_BLOCK_MAX 32 /* Not specified but we use same structure */
464 union i2c_smbus_data {
465 __u8 byte;
466 __u16 word;
467 __u8 block[I2C_SMBUS_BLOCK_MAX + 3]; /* block[0] is used for length */
468 /* one more for read length in block process call */
469 /* and one more for PEC */
470 };
471
472 /* smbus_access read or write markers */
473 #define I2C_SMBUS_READ 1
474 #define I2C_SMBUS_WRITE 0
475
476 /* SMBus transaction types (size parameter in the above functions)
477 Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */
478 #define I2C_SMBUS_QUICK 0
479 #define I2C_SMBUS_BYTE 1
480 #define I2C_SMBUS_BYTE_DATA 2
481 #define I2C_SMBUS_WORD_DATA 3
482 #define I2C_SMBUS_PROC_CALL 4
483 #define I2C_SMBUS_BLOCK_DATA 5
484 #define I2C_SMBUS_I2C_BLOCK_DATA 6
485 #define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */
486 #define I2C_SMBUS_BLOCK_DATA_PEC 8 /* SMBus 2.0 */
487 #define I2C_SMBUS_PROC_CALL_PEC 9 /* SMBus 2.0 */
488 #define I2C_SMBUS_BLOCK_PROC_CALL_PEC 10 /* SMBus 2.0 */
489 #define I2C_SMBUS_WORD_DATA_PEC 11 /* SMBus 2.0 */
490
491
492 /* ----- commands for the ioctl like i2c_command call:
493 * note that additional calls are defined in the algorithm and hw
494 * dependent layers - these can be listed here, or see the
495 * corresponding header files.
496 */
497 /* -> bit-adapter specific ioctls */
498 #define I2C_RETRIES 0x0701 /* number of times a device address */
499 /* should be polled when not */
500 /* acknowledging */
501 #define I2C_TIMEOUT 0x0702 /* set timeout - call with int */
502
503
504 /* this is for i2c-dev.c */
505 #define I2C_SLAVE 0x0703 /* Change slave address */
506 /* Attn.: Slave address is 7 or 10 bits */
507 #define I2C_SLAVE_FORCE 0x0706 /* Change slave address */
508 /* Attn.: Slave address is 7 or 10 bits */
509 /* This changes the address, even if it */
510 /* is already taken! */
511 #define I2C_TENBIT 0x0704 /* 0 for 7 bit addrs, != 0 for 10 bit */
512
513 #define I2C_FUNCS 0x0705 /* Get the adapter functionality */
514 #define I2C_RDWR 0x0707 /* Combined R/W transfer (one stop only)*/
515 #define I2C_PEC 0x0708 /* != 0 for SMBus PEC */
516 #if 0
517 #define I2C_ACK_TEST 0x0710 /* See if a slave is at a specific address */
518 #endif
519
520 #define I2C_SMBUS 0x0720 /* SMBus-level access */
521
522 /* ... algo-bit.c recognizes */
523 #define I2C_UDELAY 0x0705 /* set delay in microsecs between each */
524 /* written byte (except address) */
525 #define I2C_MDELAY 0x0706 /* millisec delay between written bytes */
526
527 /* ----- I2C-DEV: char device interface stuff ------------------------- */
528
529 #define I2C_MAJOR 89 /* Device major number */
530
531 /* These defines are used for probing i2c client addresses */
532 /* Default fill of many variables */
533 #define I2C_CLIENT_DEFAULTS {I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
534 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
535 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
536 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
537 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
538 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
539 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
540 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
541 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
542 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
543 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
544 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
545 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
546 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
547 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \
548 I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END}
549
550 /* This is ugly. We need to evaluate I2C_CLIENT_MAX_OPTS before it is
551 stringified */
552 #define I2C_CLIENT_MODPARM_AUX1(x) "1-" #x "h"
553 #define I2C_CLIENT_MODPARM_AUX(x) I2C_CLIENT_MODPARM_AUX1(x)
554 #define I2C_CLIENT_MODPARM I2C_CLIENT_MODPARM_AUX(I2C_CLIENT_MAX_OPTS)
555
556 /* I2C_CLIENT_MODULE_PARM creates a module parameter, and puts it in the
557 module header */
558
559 #define I2C_CLIENT_MODULE_PARM(var,desc) \
560 static unsigned short var[I2C_CLIENT_MAX_OPTS] = I2C_CLIENT_DEFAULTS; \
561 static unsigned int var##_num; \
562 /*MODULE_PARM(var,I2C_CLIENT_MODPARM);*/ \
563 module_param_array(var, short, &var##_num, 0); \
564 MODULE_PARM_DESC(var,desc)
565
566 /* This is the one you want to use in your own modules */
567 #define I2C_CLIENT_INSMOD \
568 I2C_CLIENT_MODULE_PARM(probe, \
569 "List of adapter,address pairs to scan additionally"); \
570 I2C_CLIENT_MODULE_PARM(probe_range, \
571 "List of adapter,start-addr,end-addr triples to scan " \
572 "additionally"); \
573 I2C_CLIENT_MODULE_PARM(ignore, \
574 "List of adapter,address pairs not to scan"); \
575 I2C_CLIENT_MODULE_PARM(ignore_range, \
576 "List of adapter,start-addr,end-addr triples not to " \
577 "scan"); \
578 I2C_CLIENT_MODULE_PARM(force, \
579 "List of adapter,address pairs to boldly assume " \
580 "to be present"); \
581 static struct i2c_client_address_data addr_data = { \
582 .normal_i2c = normal_i2c, \
583 .normal_i2c_range = normal_i2c_range, \
584 .probe = probe, \
585 .probe_range = probe_range, \
586 .ignore = ignore, \
587 .ignore_range = ignore_range, \
588 .force = force, \
589 }
590
591 /* Detect whether we are on the isa bus. If this returns true, all i2c
592 access will fail! */
593 #define i2c_is_isa_client(clientptr) \
594 ((clientptr)->adapter->algo->id == I2C_ALGO_ISA)
595 #define i2c_is_isa_adapter(adapptr) \
596 ((adapptr)->algo->id == I2C_ALGO_ISA)
597
598 #endif /* _LINUX_I2C_H */
599
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