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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 | #ifndef _LINUX_I2C_H |
27 | #define _LINUX_I2C_H |
28 | |
29 | #include <linux/types.h> |
30 | #ifdef __KERNEL__ |
31 | #include <linux/module.h> |
32 | #include <linux/i2c-id.h> |
33 | #include <linux/mod_devicetable.h> |
34 | #include <linux/device.h> /* for struct device */ |
35 | #include <linux/sched.h> /* for completion */ |
36 | #include <linux/mutex.h> |
37 | |
38 | extern struct bus_type i2c_bus_type; |
39 | |
40 | /* --- General options ------------------------------------------------ */ |
41 | |
42 | struct i2c_msg; |
43 | struct i2c_algorithm; |
44 | struct i2c_adapter; |
45 | struct i2c_client; |
46 | struct i2c_driver; |
47 | union i2c_smbus_data; |
48 | struct i2c_board_info; |
49 | |
50 | #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
51 | /* |
52 | * The master routines are the ones normally used to transmit data to devices |
53 | * on a bus (or read from them). Apart from two basic transfer functions to |
54 | * transmit one message at a time, a more complex version can be used to |
55 | * transmit an arbitrary number of messages without interruption. |
56 | * @count must be be less than 64k since msg.len is u16. |
57 | */ |
58 | extern int i2c_master_send(struct i2c_client *client, const char *buf, |
59 | int count); |
60 | extern int i2c_master_recv(struct i2c_client *client, char *buf, int count); |
61 | |
62 | /* Transfer num messages. |
63 | */ |
64 | extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, |
65 | int num); |
66 | |
67 | /* This is the very generalized SMBus access routine. You probably do not |
68 | want to use this, though; one of the functions below may be much easier, |
69 | and probably just as fast. |
70 | Note that we use i2c_adapter here, because you do not need a specific |
71 | smbus adapter to call this function. */ |
72 | extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, |
73 | unsigned short flags, char read_write, u8 command, |
74 | int size, union i2c_smbus_data *data); |
75 | |
76 | /* Now follow the 'nice' access routines. These also document the calling |
77 | conventions of i2c_smbus_xfer. */ |
78 | |
79 | extern s32 i2c_smbus_read_byte(struct i2c_client *client); |
80 | extern s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value); |
81 | extern s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command); |
82 | extern s32 i2c_smbus_write_byte_data(struct i2c_client *client, |
83 | u8 command, u8 value); |
84 | extern s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command); |
85 | extern s32 i2c_smbus_write_word_data(struct i2c_client *client, |
86 | u8 command, u16 value); |
87 | /* Returns the number of read bytes */ |
88 | extern s32 i2c_smbus_read_block_data(struct i2c_client *client, |
89 | u8 command, u8 *values); |
90 | extern s32 i2c_smbus_write_block_data(struct i2c_client *client, |
91 | u8 command, u8 length, const u8 *values); |
92 | /* Returns the number of read bytes */ |
93 | extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client, |
94 | u8 command, u8 length, u8 *values); |
95 | extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client, |
96 | u8 command, u8 length, |
97 | const u8 *values); |
98 | #endif /* I2C */ |
99 | |
100 | /** |
101 | * struct i2c_driver - represent an I2C device driver |
102 | * @class: What kind of i2c device we instantiate (for detect) |
103 | * @attach_adapter: Callback for bus addition (for legacy drivers) |
104 | * @detach_adapter: Callback for bus removal (for legacy drivers) |
105 | * @probe: Callback for device binding |
106 | * @remove: Callback for device unbinding |
107 | * @shutdown: Callback for device shutdown |
108 | * @suspend: Callback for device suspend |
109 | * @resume: Callback for device resume |
110 | * @command: Callback for bus-wide signaling (optional) |
111 | * @driver: Device driver model driver |
112 | * @id_table: List of I2C devices supported by this driver |
113 | * @detect: Callback for device detection |
114 | * @address_list: The I2C addresses to probe (for detect) |
115 | * @clients: List of detected clients we created (for i2c-core use only) |
116 | * |
117 | * The driver.owner field should be set to the module owner of this driver. |
118 | * The driver.name field should be set to the name of this driver. |
119 | * |
120 | * For automatic device detection, both @detect and @address_data must |
121 | * be defined. @class should also be set, otherwise only devices forced |
122 | * with module parameters will be created. The detect function must |
123 | * fill at least the name field of the i2c_board_info structure it is |
124 | * handed upon successful detection, and possibly also the flags field. |
125 | * |
126 | * If @detect is missing, the driver will still work fine for enumerated |
127 | * devices. Detected devices simply won't be supported. This is expected |
128 | * for the many I2C/SMBus devices which can't be detected reliably, and |
129 | * the ones which can always be enumerated in practice. |
130 | * |
131 | * The i2c_client structure which is handed to the @detect callback is |
132 | * not a real i2c_client. It is initialized just enough so that you can |
133 | * call i2c_smbus_read_byte_data and friends on it. Don't do anything |
134 | * else with it. In particular, calling dev_dbg and friends on it is |
135 | * not allowed. |
136 | */ |
137 | struct i2c_driver { |
138 | unsigned int class; |
139 | |
140 | /* Notifies the driver that a new bus has appeared or is about to be |
141 | * removed. You should avoid using this if you can, it will probably |
142 | * be removed in a near future. |
143 | */ |
144 | int (*attach_adapter)(struct i2c_adapter *); |
145 | int (*detach_adapter)(struct i2c_adapter *); |
146 | |
147 | /* Standard driver model interfaces */ |
148 | int (*probe)(struct i2c_client *, const struct i2c_device_id *); |
149 | int (*remove)(struct i2c_client *); |
150 | |
151 | /* driver model interfaces that don't relate to enumeration */ |
152 | void (*shutdown)(struct i2c_client *); |
153 | int (*suspend)(struct i2c_client *, pm_message_t mesg); |
154 | int (*resume)(struct i2c_client *); |
155 | |
156 | /* Alert callback, for example for the SMBus alert protocol. |
157 | * The format and meaning of the data value depends on the protocol. |
158 | * For the SMBus alert protocol, there is a single bit of data passed |
159 | * as the alert response's low bit ("event flag"). |
160 | */ |
161 | void (*alert)(struct i2c_client *, unsigned int data); |
162 | |
163 | /* a ioctl like command that can be used to perform specific functions |
164 | * with the device. |
165 | */ |
166 | int (*command)(struct i2c_client *client, unsigned int cmd, void *arg); |
167 | |
168 | struct device_driver driver; |
169 | const struct i2c_device_id *id_table; |
170 | |
171 | /* Device detection callback for automatic device creation */ |
172 | int (*detect)(struct i2c_client *, struct i2c_board_info *); |
173 | const unsigned short *address_list; |
174 | struct list_head clients; |
175 | }; |
176 | #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver) |
177 | |
178 | /** |
179 | * struct i2c_client - represent an I2C slave device |
180 | * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address; |
181 | * I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking |
182 | * @addr: Address used on the I2C bus connected to the parent adapter. |
183 | * @name: Indicates the type of the device, usually a chip name that's |
184 | * generic enough to hide second-sourcing and compatible revisions. |
185 | * @adapter: manages the bus segment hosting this I2C device |
186 | * @driver: device's driver, hence pointer to access routines |
187 | * @dev: Driver model device node for the slave. |
188 | * @irq: indicates the IRQ generated by this device (if any) |
189 | * @detected: member of an i2c_driver.clients list or i2c-core's |
190 | * userspace_devices list |
191 | * |
192 | * An i2c_client identifies a single device (i.e. chip) connected to an |
193 | * i2c bus. The behaviour exposed to Linux is defined by the driver |
194 | * managing the device. |
195 | */ |
196 | struct i2c_client { |
197 | unsigned short flags; /* div., see below */ |
198 | unsigned short addr; /* chip address - NOTE: 7bit */ |
199 | /* addresses are stored in the */ |
200 | /* _LOWER_ 7 bits */ |
201 | char name[I2C_NAME_SIZE]; |
202 | struct i2c_adapter *adapter; /* the adapter we sit on */ |
203 | struct i2c_driver *driver; /* and our access routines */ |
204 | struct device dev; /* the device structure */ |
205 | int irq; /* irq issued by device */ |
206 | struct list_head detected; |
207 | }; |
208 | #define to_i2c_client(d) container_of(d, struct i2c_client, dev) |
209 | |
210 | extern struct i2c_client *i2c_verify_client(struct device *dev); |
211 | |
212 | static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj) |
213 | { |
214 | struct device * const dev = container_of(kobj, struct device, kobj); |
215 | return to_i2c_client(dev); |
216 | } |
217 | |
218 | static inline void *i2c_get_clientdata(const struct i2c_client *dev) |
219 | { |
220 | return dev_get_drvdata(&dev->dev); |
221 | } |
222 | |
223 | static inline void i2c_set_clientdata(struct i2c_client *dev, void *data) |
224 | { |
225 | dev_set_drvdata(&dev->dev, data); |
226 | } |
227 | |
228 | /** |
229 | * struct i2c_board_info - template for device creation |
230 | * @type: chip type, to initialize i2c_client.name |
231 | * @flags: to initialize i2c_client.flags |
232 | * @addr: stored in i2c_client.addr |
233 | * @platform_data: stored in i2c_client.dev.platform_data |
234 | * @archdata: copied into i2c_client.dev.archdata |
235 | * @irq: stored in i2c_client.irq |
236 | * |
237 | * I2C doesn't actually support hardware probing, although controllers and |
238 | * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's |
239 | * a device at a given address. Drivers commonly need more information than |
240 | * that, such as chip type, configuration, associated IRQ, and so on. |
241 | * |
242 | * i2c_board_info is used to build tables of information listing I2C devices |
243 | * that are present. This information is used to grow the driver model tree. |
244 | * For mainboards this is done statically using i2c_register_board_info(); |
245 | * bus numbers identify adapters that aren't yet available. For add-on boards, |
246 | * i2c_new_device() does this dynamically with the adapter already known. |
247 | */ |
248 | struct i2c_board_info { |
249 | char type[I2C_NAME_SIZE]; |
250 | unsigned short flags; |
251 | unsigned short addr; |
252 | void *platform_data; |
253 | struct dev_archdata *archdata; |
254 | int irq; |
255 | }; |
256 | |
257 | /** |
258 | * I2C_BOARD_INFO - macro used to list an i2c device and its address |
259 | * @dev_type: identifies the device type |
260 | * @dev_addr: the device's address on the bus. |
261 | * |
262 | * This macro initializes essential fields of a struct i2c_board_info, |
263 | * declaring what has been provided on a particular board. Optional |
264 | * fields (such as associated irq, or device-specific platform_data) |
265 | * are provided using conventional syntax. |
266 | */ |
267 | #define I2C_BOARD_INFO(dev_type, dev_addr) \ |
268 | .type = dev_type, .addr = (dev_addr) |
269 | |
270 | |
271 | #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
272 | /* Add-on boards should register/unregister their devices; e.g. a board |
273 | * with integrated I2C, a config eeprom, sensors, and a codec that's |
274 | * used in conjunction with the primary hardware. |
275 | */ |
276 | extern struct i2c_client * |
277 | i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info); |
278 | |
279 | /* If you don't know the exact address of an I2C device, use this variant |
280 | * instead, which can probe for device presence in a list of possible |
281 | * addresses. |
282 | */ |
283 | extern struct i2c_client * |
284 | i2c_new_probed_device(struct i2c_adapter *adap, |
285 | struct i2c_board_info *info, |
286 | unsigned short const *addr_list); |
287 | |
288 | /* For devices that use several addresses, use i2c_new_dummy() to make |
289 | * client handles for the extra addresses. |
290 | */ |
291 | extern struct i2c_client * |
292 | i2c_new_dummy(struct i2c_adapter *adap, u16 address); |
293 | |
294 | extern void i2c_unregister_device(struct i2c_client *); |
295 | #endif /* I2C */ |
296 | |
297 | /* Mainboard arch_initcall() code should register all its I2C devices. |
298 | * This is done at arch_initcall time, before declaring any i2c adapters. |
299 | * Modules for add-on boards must use other calls. |
300 | */ |
301 | #ifdef CONFIG_I2C_BOARDINFO |
302 | extern int |
303 | i2c_register_board_info(int busnum, struct i2c_board_info const *info, |
304 | unsigned n); |
305 | #else |
306 | static inline int |
307 | i2c_register_board_info(int busnum, struct i2c_board_info const *info, |
308 | unsigned n) |
309 | { |
310 | return 0; |
311 | } |
312 | #endif /* I2C_BOARDINFO */ |
313 | |
314 | /* |
315 | * The following structs are for those who like to implement new bus drivers: |
316 | * i2c_algorithm is the interface to a class of hardware solutions which can |
317 | * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584 |
318 | * to name two of the most common. |
319 | */ |
320 | struct i2c_algorithm { |
321 | /* If an adapter algorithm can't do I2C-level access, set master_xfer |
322 | to NULL. If an adapter algorithm can do SMBus access, set |
323 | smbus_xfer. If set to NULL, the SMBus protocol is simulated |
324 | using common I2C messages */ |
325 | /* master_xfer should return the number of messages successfully |
326 | processed, or a negative value on error */ |
327 | int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs, |
328 | int num); |
329 | int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr, |
330 | unsigned short flags, char read_write, |
331 | u8 command, int size, union i2c_smbus_data *data); |
332 | |
333 | /* To determine what the adapter supports */ |
334 | u32 (*functionality) (struct i2c_adapter *); |
335 | }; |
336 | |
337 | /* |
338 | * i2c_adapter is the structure used to identify a physical i2c bus along |
339 | * with the access algorithms necessary to access it. |
340 | */ |
341 | struct i2c_adapter { |
342 | struct module *owner; |
343 | unsigned int id; |
344 | unsigned int class; /* classes to allow probing for */ |
345 | const struct i2c_algorithm *algo; /* the algorithm to access the bus */ |
346 | void *algo_data; |
347 | |
348 | /* data fields that are valid for all devices */ |
349 | struct rt_mutex bus_lock; |
350 | |
351 | int timeout; /* in jiffies */ |
352 | int retries; |
353 | struct device dev; /* the adapter device */ |
354 | |
355 | int nr; |
356 | char name[48]; |
357 | struct completion dev_released; |
358 | }; |
359 | #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev) |
360 | |
361 | static inline void *i2c_get_adapdata(const struct i2c_adapter *dev) |
362 | { |
363 | return dev_get_drvdata(&dev->dev); |
364 | } |
365 | |
366 | static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data) |
367 | { |
368 | dev_set_drvdata(&dev->dev, data); |
369 | } |
370 | |
371 | /** |
372 | * i2c_lock_adapter - Prevent access to an I2C bus segment |
373 | * @adapter: Target I2C bus segment |
374 | */ |
375 | static inline void i2c_lock_adapter(struct i2c_adapter *adapter) |
376 | { |
377 | rt_mutex_lock(&adapter->bus_lock); |
378 | } |
379 | |
380 | /** |
381 | * i2c_unlock_adapter - Reauthorize access to an I2C bus segment |
382 | * @adapter: Target I2C bus segment |
383 | */ |
384 | static inline void i2c_unlock_adapter(struct i2c_adapter *adapter) |
385 | { |
386 | rt_mutex_unlock(&adapter->bus_lock); |
387 | } |
388 | |
389 | /*flags for the client struct: */ |
390 | #define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */ |
391 | #define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */ |
392 | /* Must equal I2C_M_TEN below */ |
393 | #define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */ |
394 | |
395 | /* i2c adapter classes (bitmask) */ |
396 | #define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */ |
397 | #define I2C_CLASS_TV_ANALOG (1<<1) /* bttv + friends */ |
398 | #define I2C_CLASS_TV_DIGITAL (1<<2) /* dvb cards */ |
399 | #define I2C_CLASS_DDC (1<<3) /* DDC bus on graphics adapters */ |
400 | #define I2C_CLASS_SPD (1<<7) /* SPD EEPROMs and similar */ |
401 | |
402 | /* Internal numbers to terminate lists */ |
403 | #define I2C_CLIENT_END 0xfffeU |
404 | |
405 | /* The numbers to use to set I2C bus address */ |
406 | #define ANY_I2C_BUS 0xffff |
407 | |
408 | /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */ |
409 | #define I2C_ADDRS(addr, addrs...) \ |
410 | ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END }) |
411 | |
412 | |
413 | /* ----- functions exported by i2c.o */ |
414 | |
415 | /* administration... |
416 | */ |
417 | #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
418 | extern int i2c_add_adapter(struct i2c_adapter *); |
419 | extern int i2c_del_adapter(struct i2c_adapter *); |
420 | extern int i2c_add_numbered_adapter(struct i2c_adapter *); |
421 | |
422 | extern int i2c_register_driver(struct module *, struct i2c_driver *); |
423 | extern void i2c_del_driver(struct i2c_driver *); |
424 | |
425 | static inline int i2c_add_driver(struct i2c_driver *driver) |
426 | { |
427 | return i2c_register_driver(THIS_MODULE, driver); |
428 | } |
429 | |
430 | extern struct i2c_client *i2c_use_client(struct i2c_client *client); |
431 | extern void i2c_release_client(struct i2c_client *client); |
432 | |
433 | /* call the i2c_client->command() of all attached clients with |
434 | * the given arguments */ |
435 | extern void i2c_clients_command(struct i2c_adapter *adap, |
436 | unsigned int cmd, void *arg); |
437 | |
438 | extern struct i2c_adapter *i2c_get_adapter(int id); |
439 | extern void i2c_put_adapter(struct i2c_adapter *adap); |
440 | |
441 | |
442 | /* Return the functionality mask */ |
443 | static inline u32 i2c_get_functionality(struct i2c_adapter *adap) |
444 | { |
445 | return adap->algo->functionality(adap); |
446 | } |
447 | |
448 | /* Return 1 if adapter supports everything we need, 0 if not. */ |
449 | static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func) |
450 | { |
451 | return (func & i2c_get_functionality(adap)) == func; |
452 | } |
453 | |
454 | /* Return the adapter number for a specific adapter */ |
455 | static inline int i2c_adapter_id(struct i2c_adapter *adap) |
456 | { |
457 | return adap->nr; |
458 | } |
459 | #endif /* I2C */ |
460 | #endif /* __KERNEL__ */ |
461 | |
462 | /** |
463 | * struct i2c_msg - an I2C transaction segment beginning with START |
464 | * @addr: Slave address, either seven or ten bits. When this is a ten |
465 | * bit address, I2C_M_TEN must be set in @flags and the adapter |
466 | * must support I2C_FUNC_10BIT_ADDR. |
467 | * @flags: I2C_M_RD is handled by all adapters. No other flags may be |
468 | * provided unless the adapter exported the relevant I2C_FUNC_* |
469 | * flags through i2c_check_functionality(). |
470 | * @len: Number of data bytes in @buf being read from or written to the |
471 | * I2C slave address. For read transactions where I2C_M_RECV_LEN |
472 | * is set, the caller guarantees that this buffer can hold up to |
473 | * 32 bytes in addition to the initial length byte sent by the |
474 | * slave (plus, if used, the SMBus PEC); and this value will be |
475 | * incremented by the number of block data bytes received. |
476 | * @buf: The buffer into which data is read, or from which it's written. |
477 | * |
478 | * An i2c_msg is the low level representation of one segment of an I2C |
479 | * transaction. It is visible to drivers in the @i2c_transfer() procedure, |
480 | * to userspace from i2c-dev, and to I2C adapter drivers through the |
481 | * @i2c_adapter.@master_xfer() method. |
482 | * |
483 | * Except when I2C "protocol mangling" is used, all I2C adapters implement |
484 | * the standard rules for I2C transactions. Each transaction begins with a |
485 | * START. That is followed by the slave address, and a bit encoding read |
486 | * versus write. Then follow all the data bytes, possibly including a byte |
487 | * with SMBus PEC. The transfer terminates with a NAK, or when all those |
488 | * bytes have been transferred and ACKed. If this is the last message in a |
489 | * group, it is followed by a STOP. Otherwise it is followed by the next |
490 | * @i2c_msg transaction segment, beginning with a (repeated) START. |
491 | * |
492 | * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then |
493 | * passing certain @flags may have changed those standard protocol behaviors. |
494 | * Those flags are only for use with broken/nonconforming slaves, and with |
495 | * adapters which are known to support the specific mangling options they |
496 | * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR). |
497 | */ |
498 | struct i2c_msg { |
499 | __u16 addr; /* slave address */ |
500 | __u16 flags; |
501 | #define I2C_M_TEN 0x0010 /* this is a ten bit chip address */ |
502 | #define I2C_M_RD 0x0001 /* read data, from slave to master */ |
503 | #define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */ |
504 | #define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */ |
505 | #define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */ |
506 | #define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */ |
507 | #define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */ |
508 | __u16 len; /* msg length */ |
509 | __u8 *buf; /* pointer to msg data */ |
510 | }; |
511 | |
512 | /* To determine what functionality is present */ |
513 | |
514 | #define I2C_FUNC_I2C 0x00000001 |
515 | #define I2C_FUNC_10BIT_ADDR 0x00000002 |
516 | #define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_NOSTART etc. */ |
517 | #define I2C_FUNC_SMBUS_PEC 0x00000008 |
518 | #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */ |
519 | #define I2C_FUNC_SMBUS_QUICK 0x00010000 |
520 | #define I2C_FUNC_SMBUS_READ_BYTE 0x00020000 |
521 | #define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000 |
522 | #define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000 |
523 | #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000 |
524 | #define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000 |
525 | #define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000 |
526 | #define I2C_FUNC_SMBUS_PROC_CALL 0x00800000 |
527 | #define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000 |
528 | #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 |
529 | #define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */ |
530 | #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */ |
531 | |
532 | #define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \ |
533 | I2C_FUNC_SMBUS_WRITE_BYTE) |
534 | #define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \ |
535 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA) |
536 | #define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \ |
537 | I2C_FUNC_SMBUS_WRITE_WORD_DATA) |
538 | #define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \ |
539 | I2C_FUNC_SMBUS_WRITE_BLOCK_DATA) |
540 | #define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \ |
541 | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK) |
542 | |
543 | #define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \ |
544 | I2C_FUNC_SMBUS_BYTE | \ |
545 | I2C_FUNC_SMBUS_BYTE_DATA | \ |
546 | I2C_FUNC_SMBUS_WORD_DATA | \ |
547 | I2C_FUNC_SMBUS_PROC_CALL | \ |
548 | I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \ |
549 | I2C_FUNC_SMBUS_I2C_BLOCK | \ |
550 | I2C_FUNC_SMBUS_PEC) |
551 | |
552 | /* |
553 | * Data for SMBus Messages |
554 | */ |
555 | #define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */ |
556 | union i2c_smbus_data { |
557 | __u8 byte; |
558 | __u16 word; |
559 | __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */ |
560 | /* and one more for user-space compatibility */ |
561 | }; |
562 | |
563 | /* i2c_smbus_xfer read or write markers */ |
564 | #define I2C_SMBUS_READ 1 |
565 | #define I2C_SMBUS_WRITE 0 |
566 | |
567 | /* SMBus transaction types (size parameter in the above functions) |
568 | Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */ |
569 | #define I2C_SMBUS_QUICK 0 |
570 | #define I2C_SMBUS_BYTE 1 |
571 | #define I2C_SMBUS_BYTE_DATA 2 |
572 | #define I2C_SMBUS_WORD_DATA 3 |
573 | #define I2C_SMBUS_PROC_CALL 4 |
574 | #define I2C_SMBUS_BLOCK_DATA 5 |
575 | #define I2C_SMBUS_I2C_BLOCK_BROKEN 6 |
576 | #define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */ |
577 | #define I2C_SMBUS_I2C_BLOCK_DATA 8 |
578 | |
579 | #endif /* _LINUX_I2C_H */ |
580 |
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