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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 | ||
40 | struct i2c_msg; | |
41 | struct i2c_algorithm; | |
42 | struct i2c_adapter; | |
43 | struct i2c_client; | |
44 | struct i2c_driver; | |
1da177e4 LT |
45 | union 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 | */ | |
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 *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 | 66 | extern 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 | ||
74 | extern s32 i2c_smbus_write_quick(struct i2c_client * client, u8 value); | |
75 | extern s32 i2c_smbus_read_byte(struct i2c_client * client); | |
76 | extern s32 i2c_smbus_write_byte(struct i2c_client * client, u8 value); | |
77 | extern s32 i2c_smbus_read_byte_data(struct i2c_client * client, u8 command); | |
78 | extern s32 i2c_smbus_write_byte_data(struct i2c_client * client, | |
79 | u8 command, u8 value); | |
80 | extern s32 i2c_smbus_read_word_data(struct i2c_client * client, u8 command); | |
81 | extern s32 i2c_smbus_write_word_data(struct i2c_client * client, | |
82 | u8 command, u16 value); | |
b86a1bc8 JD |
83 | /* Returns the number of read bytes */ |
84 | extern s32 i2c_smbus_read_block_data(struct i2c_client *client, | |
85 | u8 command, u8 *values); | |
1da177e4 LT |
86 | extern 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 | 90 | extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client * client, |
4b2643d7 | 91 | u8 command, u8 length, u8 *values); |
21bbd691 JD |
92 | extern 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 | ||
105 | struct 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; | |
1da177e4 LT |
143 | }; |
144 | #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver) | |
145 | ||
2096b956 DB |
146 | #define I2C_NAME_SIZE 20 |
147 | ||
148 | /** | |
149 | * struct i2c_client - represent an I2C slave device | |
d64f73be DB |
150 | * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address; |
151 | * I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking | |
2096b956 DB |
152 | * @addr: Address used on the I2C bus connected to the parent adapter. |
153 | * @name: Indicates the type of the device, usually a chip name that's | |
154 | * generic enough to hide second-sourcing and compatible revisions. | |
d64f73be | 155 | * @adapter: manages the bus segment hosting this I2C device |
aa3481d5 | 156 | * @driver: device's driver, hence pointer to access routines |
2096b956 | 157 | * @dev: Driver model device node for the slave. |
d64f73be | 158 | * @irq: indicates the IRQ generated by this device (if any) |
7b4fbc50 DB |
159 | * @driver_name: Identifies new-style driver used with this device; also |
160 | * used as the module name for hotplug/coldplug modprobe support. | |
aa3481d5 RD |
161 | * @list: list of active/busy clients |
162 | * @released: used to synchronize client releases & detaches and references | |
2096b956 DB |
163 | * |
164 | * An i2c_client identifies a single device (i.e. chip) connected to an | |
d64f73be DB |
165 | * i2c bus. The behaviour exposed to Linux is defined by the driver |
166 | * managing the device. | |
1da177e4 LT |
167 | */ |
168 | struct i2c_client { | |
2096b956 | 169 | unsigned short flags; /* div., see below */ |
438d6c2c | 170 | unsigned short addr; /* chip address - NOTE: 7bit */ |
1da177e4 | 171 | /* addresses are stored in the */ |
5071860a | 172 | /* _LOWER_ 7 bits */ |
2096b956 | 173 | char name[I2C_NAME_SIZE]; |
1da177e4 LT |
174 | struct i2c_adapter *adapter; /* the adapter we sit on */ |
175 | struct i2c_driver *driver; /* and our access routines */ | |
1da177e4 | 176 | struct device dev; /* the device structure */ |
9c1600ed | 177 | int irq; /* irq issued by device (or -1) */ |
7b4fbc50 | 178 | char driver_name[KOBJ_NAME_LEN]; |
1da177e4 | 179 | struct list_head list; |
1da177e4 LT |
180 | struct completion released; |
181 | }; | |
182 | #define to_i2c_client(d) container_of(d, struct i2c_client, dev) | |
183 | ||
a61fc683 | 184 | static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj) |
185 | { | |
d75d53cd MH |
186 | struct device * const dev = container_of(kobj, struct device, kobj); |
187 | return to_i2c_client(dev); | |
a61fc683 | 188 | } |
189 | ||
1da177e4 LT |
190 | static inline void *i2c_get_clientdata (struct i2c_client *dev) |
191 | { | |
192 | return dev_get_drvdata (&dev->dev); | |
193 | } | |
194 | ||
195 | static inline void i2c_set_clientdata (struct i2c_client *dev, void *data) | |
196 | { | |
197 | dev_set_drvdata (&dev->dev, data); | |
198 | } | |
199 | ||
9c1600ed DB |
200 | /** |
201 | * struct i2c_board_info - template for device creation | |
202 | * @driver_name: identifies the driver to be bound to the device | |
203 | * @type: optional chip type information, to initialize i2c_client.name | |
204 | * @flags: to initialize i2c_client.flags | |
205 | * @addr: stored in i2c_client.addr | |
206 | * @platform_data: stored in i2c_client.dev.platform_data | |
207 | * @irq: stored in i2c_client.irq | |
d64f73be | 208 | * |
9c1600ed DB |
209 | * I2C doesn't actually support hardware probing, although controllers and |
210 | * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's | |
211 | * a device at a given address. Drivers commonly need more information than | |
212 | * that, such as chip type, configuration, associated IRQ, and so on. | |
213 | * | |
214 | * i2c_board_info is used to build tables of information listing I2C devices | |
215 | * that are present. This information is used to grow the driver model tree | |
216 | * for "new style" I2C drivers. For mainboards this is done statically using | |
d64f73be | 217 | * i2c_register_board_info(); bus numbers identify adapters that aren't |
9c1600ed DB |
218 | * yet available. For add-on boards, i2c_new_device() does this dynamically |
219 | * with the adapter already known. | |
220 | */ | |
221 | struct i2c_board_info { | |
222 | char driver_name[KOBJ_NAME_LEN]; | |
223 | char type[I2C_NAME_SIZE]; | |
224 | unsigned short flags; | |
225 | unsigned short addr; | |
226 | void *platform_data; | |
227 | int irq; | |
228 | }; | |
229 | ||
230 | /** | |
231 | * I2C_BOARD_INFO - macro used to list an i2c device and its driver | |
232 | * @driver: identifies the driver to use with the device | |
233 | * @dev_addr: the device's address on the bus. | |
234 | * | |
235 | * This macro initializes essential fields of a struct i2c_board_info, | |
236 | * declaring what has been provided on a particular board. Optional | |
237 | * fields (such as the chip type, its associated irq, or device-specific | |
238 | * platform_data) are provided using conventional syntax. | |
239 | */ | |
240 | #define I2C_BOARD_INFO(driver,dev_addr) \ | |
241 | .driver_name = (driver), .addr = (dev_addr) | |
242 | ||
243 | ||
244 | /* Add-on boards should register/unregister their devices; e.g. a board | |
245 | * with integrated I2C, a config eeprom, sensors, and a codec that's | |
246 | * used in conjunction with the primary hardware. | |
247 | */ | |
248 | extern struct i2c_client * | |
249 | i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info); | |
250 | ||
12b5053a JD |
251 | /* If you don't know the exact address of an I2C device, use this variant |
252 | * instead, which can probe for device presence in a list of possible | |
253 | * addresses. | |
254 | */ | |
255 | extern struct i2c_client * | |
256 | i2c_new_probed_device(struct i2c_adapter *adap, | |
257 | struct i2c_board_info *info, | |
258 | unsigned short const *addr_list); | |
259 | ||
9c1600ed DB |
260 | extern void i2c_unregister_device(struct i2c_client *); |
261 | ||
262 | /* Mainboard arch_initcall() code should register all its I2C devices. | |
263 | * This is done at arch_initcall time, before declaring any i2c adapters. | |
264 | * Modules for add-on boards must use other calls. | |
265 | */ | |
266 | extern int | |
267 | i2c_register_board_info(int busnum, struct i2c_board_info const *info, unsigned n); | |
268 | ||
269 | ||
1da177e4 LT |
270 | /* |
271 | * The following structs are for those who like to implement new bus drivers: | |
272 | * i2c_algorithm is the interface to a class of hardware solutions which can | |
273 | * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584 | |
274 | * to name two of the most common. | |
275 | */ | |
276 | struct i2c_algorithm { | |
1da177e4 | 277 | /* If an adapter algorithm can't do I2C-level access, set master_xfer |
438d6c2c | 278 | to NULL. If an adapter algorithm can do SMBus access, set |
1da177e4 LT |
279 | smbus_xfer. If set to NULL, the SMBus protocol is simulated |
280 | using common I2C messages */ | |
8ced8eee JD |
281 | /* master_xfer should return the number of messages successfully |
282 | processed, or a negative value on error */ | |
438d6c2c | 283 | int (*master_xfer)(struct i2c_adapter *adap,struct i2c_msg *msgs, |
1da177e4 | 284 | int num); |
438d6c2c | 285 | int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr, |
1da177e4 LT |
286 | unsigned short flags, char read_write, |
287 | u8 command, int size, union i2c_smbus_data * data); | |
288 | ||
1da177e4 LT |
289 | /* To determine what the adapter supports */ |
290 | u32 (*functionality) (struct i2c_adapter *); | |
291 | }; | |
292 | ||
293 | /* | |
294 | * i2c_adapter is the structure used to identify a physical i2c bus along | |
295 | * with the access algorithms necessary to access it. | |
296 | */ | |
297 | struct i2c_adapter { | |
298 | struct module *owner; | |
020789e9 | 299 | unsigned int id; |
1da177e4 | 300 | unsigned int class; |
af71ff69 | 301 | const struct i2c_algorithm *algo; /* the algorithm to access the bus */ |
1da177e4 LT |
302 | void *algo_data; |
303 | ||
304 | /* --- administration stuff. */ | |
305 | int (*client_register)(struct i2c_client *); | |
306 | int (*client_unregister)(struct i2c_client *); | |
307 | ||
308 | /* data fields that are valid for all devices */ | |
6ea23039 | 309 | u8 level; /* nesting level for lockdep */ |
5c085d36 IM |
310 | struct mutex bus_lock; |
311 | struct mutex clist_lock; | |
1da177e4 LT |
312 | |
313 | int timeout; | |
314 | int retries; | |
315 | struct device dev; /* the adapter device */ | |
1da177e4 | 316 | |
1da177e4 LT |
317 | int nr; |
318 | struct list_head clients; | |
2096b956 | 319 | char name[48]; |
1da177e4 | 320 | struct completion dev_released; |
1da177e4 | 321 | }; |
ef2c8321 | 322 | #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev) |
1da177e4 LT |
323 | |
324 | static inline void *i2c_get_adapdata (struct i2c_adapter *dev) | |
325 | { | |
326 | return dev_get_drvdata (&dev->dev); | |
327 | } | |
328 | ||
329 | static inline void i2c_set_adapdata (struct i2c_adapter *dev, void *data) | |
330 | { | |
331 | dev_set_drvdata (&dev->dev, data); | |
332 | } | |
333 | ||
1da177e4 | 334 | /*flags for the client struct: */ |
3bbb835d DB |
335 | #define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */ |
336 | #define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */ | |
337 | /* Must equal I2C_M_TEN below */ | |
338 | #define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */ | |
1da177e4 LT |
339 | |
340 | /* i2c adapter classes (bitmask) */ | |
341 | #define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */ | |
342 | #define I2C_CLASS_TV_ANALOG (1<<1) /* bttv + friends */ | |
343 | #define I2C_CLASS_TV_DIGITAL (1<<2) /* dvb cards */ | |
344 | #define I2C_CLASS_DDC (1<<3) /* i2c-matroxfb ? */ | |
345 | #define I2C_CLASS_CAM_ANALOG (1<<4) /* camera with analog CCD */ | |
346 | #define I2C_CLASS_CAM_DIGITAL (1<<5) /* most webcams */ | |
347 | #define I2C_CLASS_SOUND (1<<6) /* sound devices */ | |
348 | #define I2C_CLASS_ALL (UINT_MAX) /* all of the above */ | |
349 | ||
350 | /* i2c_client_address_data is the struct for holding default client | |
351 | * addresses for a driver and for the parameters supplied on the | |
352 | * command line | |
353 | */ | |
354 | struct i2c_client_address_data { | |
bfb6df24 MH |
355 | const unsigned short *normal_i2c; |
356 | const unsigned short *probe; | |
357 | const unsigned short *ignore; | |
358 | const unsigned short * const *forces; | |
1da177e4 LT |
359 | }; |
360 | ||
361 | /* Internal numbers to terminate lists */ | |
362 | #define I2C_CLIENT_END 0xfffeU | |
1da177e4 LT |
363 | |
364 | /* The numbers to use to set I2C bus address */ | |
365 | #define ANY_I2C_BUS 0xffff | |
1da177e4 LT |
366 | |
367 | ||
368 | /* ----- functions exported by i2c.o */ | |
369 | ||
370 | /* administration... | |
371 | */ | |
372 | extern int i2c_add_adapter(struct i2c_adapter *); | |
373 | extern int i2c_del_adapter(struct i2c_adapter *); | |
6e13e641 | 374 | extern int i2c_add_numbered_adapter(struct i2c_adapter *); |
1da177e4 | 375 | |
de59cf9e | 376 | extern int i2c_register_driver(struct module *, struct i2c_driver *); |
b3e82096 | 377 | extern void i2c_del_driver(struct i2c_driver *); |
1da177e4 | 378 | |
de59cf9e GKH |
379 | static inline int i2c_add_driver(struct i2c_driver *driver) |
380 | { | |
381 | return i2c_register_driver(THIS_MODULE, driver); | |
382 | } | |
383 | ||
1da177e4 LT |
384 | extern int i2c_attach_client(struct i2c_client *); |
385 | extern int i2c_detach_client(struct i2c_client *); | |
386 | ||
e48d3319 JD |
387 | extern struct i2c_client *i2c_use_client(struct i2c_client *client); |
388 | extern void i2c_release_client(struct i2c_client *client); | |
1da177e4 LT |
389 | |
390 | /* call the i2c_client->command() of all attached clients with | |
391 | * the given arguments */ | |
392 | extern void i2c_clients_command(struct i2c_adapter *adap, | |
393 | unsigned int cmd, void *arg); | |
394 | ||
1da177e4 LT |
395 | /* Detect function. It iterates over all possible addresses itself. |
396 | * It will only call found_proc if some client is connected at the | |
397 | * specific address (unless a 'force' matched); | |
398 | */ | |
438d6c2c | 399 | extern int i2c_probe(struct i2c_adapter *adapter, |
bfb6df24 | 400 | const struct i2c_client_address_data *address_data, |
1da177e4 LT |
401 | int (*found_proc) (struct i2c_adapter *, int, int)); |
402 | ||
1da177e4 LT |
403 | extern struct i2c_adapter* i2c_get_adapter(int id); |
404 | extern void i2c_put_adapter(struct i2c_adapter *adap); | |
405 | ||
406 | ||
407 | /* Return the functionality mask */ | |
408 | static inline u32 i2c_get_functionality(struct i2c_adapter *adap) | |
409 | { | |
410 | return adap->algo->functionality(adap); | |
411 | } | |
412 | ||
413 | /* Return 1 if adapter supports everything we need, 0 if not. */ | |
414 | static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func) | |
415 | { | |
416 | return (func & i2c_get_functionality(adap)) == func; | |
417 | } | |
418 | ||
cdcb1921 JD |
419 | /* Return id number for a specific adapter */ |
420 | static inline int i2c_adapter_id(struct i2c_adapter *adap) | |
421 | { | |
422 | return adap->nr; | |
423 | } | |
a1b9298e | 424 | #endif /* __KERNEL__ */ |
cdcb1921 | 425 | |
a64ec07d DB |
426 | /** |
427 | * struct i2c_msg - an I2C transaction segment beginning with START | |
428 | * @addr: Slave address, either seven or ten bits. When this is a ten | |
429 | * bit address, I2C_M_TEN must be set in @flags and the adapter | |
430 | * must support I2C_FUNC_10BIT_ADDR. | |
431 | * @flags: I2C_M_RD is handled by all adapters. No other flags may be | |
432 | * provided unless the adapter exported the relevant I2C_FUNC_* | |
433 | * flags through i2c_check_functionality(). | |
434 | * @len: Number of data bytes in @buf being read from or written to the | |
435 | * I2C slave address. For read transactions where I2C_M_RECV_LEN | |
436 | * is set, the caller guarantees that this buffer can hold up to | |
437 | * 32 bytes in addition to the initial length byte sent by the | |
438 | * slave (plus, if used, the SMBus PEC); and this value will be | |
439 | * incremented by the number of block data bytes received. | |
440 | * @buf: The buffer into which data is read, or from which it's written. | |
441 | * | |
442 | * An i2c_msg is the low level representation of one segment of an I2C | |
443 | * transaction. It is visible to drivers in the @i2c_transfer() procedure, | |
444 | * to userspace from i2c-dev, and to I2C adapter drivers through the | |
445 | * @i2c_adapter.@master_xfer() method. | |
446 | * | |
447 | * Except when I2C "protocol mangling" is used, all I2C adapters implement | |
448 | * the standard rules for I2C transactions. Each transaction begins with a | |
449 | * START. That is followed by the slave address, and a bit encoding read | |
450 | * versus write. Then follow all the data bytes, possibly including a byte | |
451 | * with SMBus PEC. The transfer terminates with a NAK, or when all those | |
452 | * bytes have been transferred and ACKed. If this is the last message in a | |
453 | * group, it is followed by a STOP. Otherwise it is followed by the next | |
454 | * @i2c_msg transaction segment, beginning with a (repeated) START. | |
455 | * | |
456 | * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then | |
457 | * passing certain @flags may have changed those standard protocol behaviors. | |
458 | * Those flags are only for use with broken/nonconforming slaves, and with | |
459 | * adapters which are known to support the specific mangling options they | |
460 | * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR). | |
1da177e4 LT |
461 | */ |
462 | struct i2c_msg { | |
463 | __u16 addr; /* slave address */ | |
438d6c2c | 464 | __u16 flags; |
a64ec07d DB |
465 | #define I2C_M_TEN 0x0010 /* this is a ten bit chip address */ |
466 | #define I2C_M_RD 0x0001 /* read data, from slave to master */ | |
467 | #define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */ | |
468 | #define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */ | |
469 | #define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */ | |
470 | #define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */ | |
471 | #define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */ | |
438d6c2c DB |
472 | __u16 len; /* msg length */ |
473 | __u8 *buf; /* pointer to msg data */ | |
1da177e4 LT |
474 | }; |
475 | ||
476 | /* To determine what functionality is present */ | |
477 | ||
478 | #define I2C_FUNC_I2C 0x00000001 | |
479 | #define I2C_FUNC_10BIT_ADDR 0x00000002 | |
480 | #define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_{REV_DIR_ADDR,NOSTART,..} */ | |
6662cbb9 | 481 | #define I2C_FUNC_SMBUS_PEC 0x00000008 |
1da177e4 | 482 | #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */ |
438d6c2c DB |
483 | #define I2C_FUNC_SMBUS_QUICK 0x00010000 |
484 | #define I2C_FUNC_SMBUS_READ_BYTE 0x00020000 | |
485 | #define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000 | |
486 | #define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000 | |
487 | #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000 | |
488 | #define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000 | |
489 | #define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000 | |
490 | #define I2C_FUNC_SMBUS_PROC_CALL 0x00800000 | |
491 | #define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000 | |
492 | #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 | |
1da177e4 LT |
493 | #define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */ |
494 | #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */ | |
495 | #define I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 0x10000000 /* I2C-like block xfer */ | |
496 | #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2 0x20000000 /* w/ 2-byte reg. addr. */ | |
1da177e4 LT |
497 | |
498 | #define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \ | |
499 | I2C_FUNC_SMBUS_WRITE_BYTE) | |
500 | #define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \ | |
501 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA) | |
502 | #define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \ | |
503 | I2C_FUNC_SMBUS_WRITE_WORD_DATA) | |
504 | #define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \ | |
505 | I2C_FUNC_SMBUS_WRITE_BLOCK_DATA) | |
506 | #define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \ | |
507 | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK) | |
508 | #define I2C_FUNC_SMBUS_I2C_BLOCK_2 (I2C_FUNC_SMBUS_READ_I2C_BLOCK_2 | \ | |
509 | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK_2) | |
1da177e4 LT |
510 | |
511 | #define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \ | |
512 | I2C_FUNC_SMBUS_BYTE | \ | |
513 | I2C_FUNC_SMBUS_BYTE_DATA | \ | |
514 | I2C_FUNC_SMBUS_WORD_DATA | \ | |
515 | I2C_FUNC_SMBUS_PROC_CALL | \ | |
516 | I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \ | |
6662cbb9 DB |
517 | I2C_FUNC_SMBUS_I2C_BLOCK | \ |
518 | I2C_FUNC_SMBUS_PEC) | |
1da177e4 | 519 | |
438d6c2c DB |
520 | /* |
521 | * Data for SMBus Messages | |
1da177e4 | 522 | */ |
438d6c2c | 523 | #define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */ |
1da177e4 LT |
524 | union i2c_smbus_data { |
525 | __u8 byte; | |
526 | __u16 word; | |
332bf92b | 527 | __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */ |
421ef47b | 528 | /* and one more for user-space compatibility */ |
1da177e4 LT |
529 | }; |
530 | ||
531 | /* smbus_access read or write markers */ | |
532 | #define I2C_SMBUS_READ 1 | |
533 | #define I2C_SMBUS_WRITE 0 | |
534 | ||
438d6c2c | 535 | /* SMBus transaction types (size parameter in the above functions) |
1da177e4 LT |
536 | Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */ |
537 | #define I2C_SMBUS_QUICK 0 | |
538 | #define I2C_SMBUS_BYTE 1 | |
438d6c2c | 539 | #define I2C_SMBUS_BYTE_DATA 2 |
1da177e4 LT |
540 | #define I2C_SMBUS_WORD_DATA 3 |
541 | #define I2C_SMBUS_PROC_CALL 4 | |
542 | #define I2C_SMBUS_BLOCK_DATA 5 | |
4b2643d7 | 543 | #define I2C_SMBUS_I2C_BLOCK_BROKEN 6 |
1da177e4 | 544 | #define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */ |
4b2643d7 | 545 | #define I2C_SMBUS_I2C_BLOCK_DATA 8 |
1da177e4 LT |
546 | |
547 | ||
a1b9298e | 548 | #ifdef __KERNEL__ |
1da177e4 | 549 | |
1da177e4 LT |
550 | /* These defines are used for probing i2c client addresses */ |
551 | /* The length of the option lists */ | |
552 | #define I2C_CLIENT_MAX_OPTS 48 | |
553 | ||
554 | /* Default fill of many variables */ | |
555 | #define I2C_CLIENT_DEFAULTS {I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ | |
556 | I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ | |
557 | I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ | |
558 | I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ | |
559 | I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ | |
560 | I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ | |
561 | I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ | |
562 | I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ | |
563 | I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ | |
564 | I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ | |
565 | I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ | |
566 | I2C_CLIENT_END, I2C_CLIENT_END, I2C_CLIENT_END, \ | |
567 | 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 | ||
572 | /* I2C_CLIENT_MODULE_PARM creates a module parameter, and puts it in the | |
573 | module header */ | |
574 | ||
575 | #define I2C_CLIENT_MODULE_PARM(var,desc) \ | |
576 | static unsigned short var[I2C_CLIENT_MAX_OPTS] = I2C_CLIENT_DEFAULTS; \ | |
577 | static unsigned int var##_num; \ | |
578 | module_param_array(var, short, &var##_num, 0); \ | |
579 | MODULE_PARM_DESC(var,desc) | |
580 | ||
f4b50261 JD |
581 | #define I2C_CLIENT_MODULE_PARM_FORCE(name) \ |
582 | I2C_CLIENT_MODULE_PARM(force_##name, \ | |
583 | "List of adapter,address pairs which are " \ | |
584 | "unquestionably assumed to contain a `" \ | |
585 | # name "' chip") | |
586 | ||
587 | ||
588 | #define I2C_CLIENT_INSMOD_COMMON \ | |
589 | I2C_CLIENT_MODULE_PARM(probe, "List of adapter,address pairs to scan " \ | |
590 | "additionally"); \ | |
591 | I2C_CLIENT_MODULE_PARM(ignore, "List of adapter,address pairs not to " \ | |
592 | "scan"); \ | |
bfb6df24 | 593 | const static struct i2c_client_address_data addr_data = { \ |
f4b50261 JD |
594 | .normal_i2c = normal_i2c, \ |
595 | .probe = probe, \ | |
596 | .ignore = ignore, \ | |
597 | .forces = forces, \ | |
598 | } | |
599 | ||
bfb6df24 MH |
600 | #define I2C_CLIENT_FORCE_TEXT \ |
601 | "List of adapter,address pairs to boldly assume to be present" | |
602 | ||
f4b50261 JD |
603 | /* These are the ones you want to use in your own drivers. Pick the one |
604 | which matches the number of devices the driver differenciates between. */ | |
bfb6df24 MH |
605 | #define I2C_CLIENT_INSMOD \ |
606 | I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT); \ | |
607 | static const unsigned short * const forces[] = { force, NULL }; \ | |
f4b50261 JD |
608 | I2C_CLIENT_INSMOD_COMMON |
609 | ||
610 | #define I2C_CLIENT_INSMOD_1(chip1) \ | |
611 | enum chips { any_chip, chip1 }; \ | |
bfb6df24 | 612 | I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT); \ |
f4b50261 | 613 | I2C_CLIENT_MODULE_PARM_FORCE(chip1); \ |
bfb6df24 MH |
614 | static const unsigned short * const forces[] = { force, \ |
615 | force_##chip1, NULL }; \ | |
f4b50261 JD |
616 | I2C_CLIENT_INSMOD_COMMON |
617 | ||
618 | #define I2C_CLIENT_INSMOD_2(chip1, chip2) \ | |
619 | enum chips { any_chip, chip1, chip2 }; \ | |
bfb6df24 | 620 | I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT); \ |
f4b50261 JD |
621 | I2C_CLIENT_MODULE_PARM_FORCE(chip1); \ |
622 | I2C_CLIENT_MODULE_PARM_FORCE(chip2); \ | |
bfb6df24 MH |
623 | static const unsigned short * const forces[] = { force, \ |
624 | force_##chip1, force_##chip2, NULL }; \ | |
f4b50261 JD |
625 | I2C_CLIENT_INSMOD_COMMON |
626 | ||
627 | #define I2C_CLIENT_INSMOD_3(chip1, chip2, chip3) \ | |
628 | enum chips { any_chip, chip1, chip2, chip3 }; \ | |
bfb6df24 | 629 | I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT); \ |
f4b50261 JD |
630 | I2C_CLIENT_MODULE_PARM_FORCE(chip1); \ |
631 | I2C_CLIENT_MODULE_PARM_FORCE(chip2); \ | |
632 | I2C_CLIENT_MODULE_PARM_FORCE(chip3); \ | |
bfb6df24 MH |
633 | static const unsigned short * const forces[] = { force, \ |
634 | force_##chip1, force_##chip2, force_##chip3, NULL }; \ | |
f4b50261 JD |
635 | I2C_CLIENT_INSMOD_COMMON |
636 | ||
637 | #define I2C_CLIENT_INSMOD_4(chip1, chip2, chip3, chip4) \ | |
638 | enum chips { any_chip, chip1, chip2, chip3, chip4 }; \ | |
bfb6df24 | 639 | I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT); \ |
f4b50261 JD |
640 | I2C_CLIENT_MODULE_PARM_FORCE(chip1); \ |
641 | I2C_CLIENT_MODULE_PARM_FORCE(chip2); \ | |
642 | I2C_CLIENT_MODULE_PARM_FORCE(chip3); \ | |
643 | I2C_CLIENT_MODULE_PARM_FORCE(chip4); \ | |
bfb6df24 MH |
644 | static const unsigned short * const forces[] = { force, \ |
645 | force_##chip1, force_##chip2, force_##chip3, \ | |
646 | force_##chip4, NULL}; \ | |
f4b50261 JD |
647 | I2C_CLIENT_INSMOD_COMMON |
648 | ||
649 | #define I2C_CLIENT_INSMOD_5(chip1, chip2, chip3, chip4, chip5) \ | |
650 | enum chips { any_chip, chip1, chip2, chip3, chip4, chip5 }; \ | |
bfb6df24 | 651 | I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT); \ |
f4b50261 JD |
652 | I2C_CLIENT_MODULE_PARM_FORCE(chip1); \ |
653 | I2C_CLIENT_MODULE_PARM_FORCE(chip2); \ | |
654 | I2C_CLIENT_MODULE_PARM_FORCE(chip3); \ | |
655 | I2C_CLIENT_MODULE_PARM_FORCE(chip4); \ | |
656 | I2C_CLIENT_MODULE_PARM_FORCE(chip5); \ | |
bfb6df24 MH |
657 | static const unsigned short * const forces[] = { force, \ |
658 | force_##chip1, force_##chip2, force_##chip3, \ | |
659 | force_##chip4, force_##chip5, NULL }; \ | |
f4b50261 JD |
660 | I2C_CLIENT_INSMOD_COMMON |
661 | ||
662 | #define I2C_CLIENT_INSMOD_6(chip1, chip2, chip3, chip4, chip5, chip6) \ | |
663 | enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6 }; \ | |
bfb6df24 | 664 | I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT); \ |
f4b50261 JD |
665 | I2C_CLIENT_MODULE_PARM_FORCE(chip1); \ |
666 | I2C_CLIENT_MODULE_PARM_FORCE(chip2); \ | |
667 | I2C_CLIENT_MODULE_PARM_FORCE(chip3); \ | |
668 | I2C_CLIENT_MODULE_PARM_FORCE(chip4); \ | |
669 | I2C_CLIENT_MODULE_PARM_FORCE(chip5); \ | |
670 | I2C_CLIENT_MODULE_PARM_FORCE(chip6); \ | |
bfb6df24 MH |
671 | static const unsigned short * const forces[] = { force, \ |
672 | force_##chip1, force_##chip2, force_##chip3, \ | |
673 | force_##chip4, force_##chip5, force_##chip6, NULL }; \ | |
f4b50261 JD |
674 | I2C_CLIENT_INSMOD_COMMON |
675 | ||
676 | #define I2C_CLIENT_INSMOD_7(chip1, chip2, chip3, chip4, chip5, chip6, chip7) \ | |
677 | enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6, \ | |
678 | chip7 }; \ | |
bfb6df24 | 679 | I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT); \ |
f4b50261 JD |
680 | I2C_CLIENT_MODULE_PARM_FORCE(chip1); \ |
681 | I2C_CLIENT_MODULE_PARM_FORCE(chip2); \ | |
682 | I2C_CLIENT_MODULE_PARM_FORCE(chip3); \ | |
683 | I2C_CLIENT_MODULE_PARM_FORCE(chip4); \ | |
684 | I2C_CLIENT_MODULE_PARM_FORCE(chip5); \ | |
685 | I2C_CLIENT_MODULE_PARM_FORCE(chip6); \ | |
686 | I2C_CLIENT_MODULE_PARM_FORCE(chip7); \ | |
bfb6df24 MH |
687 | static const unsigned short * const forces[] = { force, \ |
688 | force_##chip1, force_##chip2, force_##chip3, \ | |
689 | force_##chip4, force_##chip5, force_##chip6, \ | |
690 | force_##chip7, NULL }; \ | |
f4b50261 JD |
691 | I2C_CLIENT_INSMOD_COMMON |
692 | ||
693 | #define I2C_CLIENT_INSMOD_8(chip1, chip2, chip3, chip4, chip5, chip6, chip7, chip8) \ | |
694 | enum chips { any_chip, chip1, chip2, chip3, chip4, chip5, chip6, \ | |
695 | chip7, chip8 }; \ | |
bfb6df24 | 696 | I2C_CLIENT_MODULE_PARM(force, I2C_CLIENT_FORCE_TEXT); \ |
f4b50261 JD |
697 | I2C_CLIENT_MODULE_PARM_FORCE(chip1); \ |
698 | I2C_CLIENT_MODULE_PARM_FORCE(chip2); \ | |
699 | I2C_CLIENT_MODULE_PARM_FORCE(chip3); \ | |
700 | I2C_CLIENT_MODULE_PARM_FORCE(chip4); \ | |
701 | I2C_CLIENT_MODULE_PARM_FORCE(chip5); \ | |
702 | I2C_CLIENT_MODULE_PARM_FORCE(chip6); \ | |
703 | I2C_CLIENT_MODULE_PARM_FORCE(chip7); \ | |
704 | I2C_CLIENT_MODULE_PARM_FORCE(chip8); \ | |
bfb6df24 MH |
705 | static const unsigned short * const forces[] = { force, \ |
706 | force_##chip1, force_##chip2, force_##chip3, \ | |
707 | force_##chip4, force_##chip5, force_##chip6, \ | |
708 | force_##chip7, force_##chip8, NULL }; \ | |
f4b50261 | 709 | I2C_CLIENT_INSMOD_COMMON |
a1b9298e | 710 | #endif /* __KERNEL__ */ |
1da177e4 | 711 | #endif /* _LINUX_I2C_H */ |