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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 | |
5694f8a8 JD |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
21 | MA 02110-1301 USA. */ | |
1da177e4 LT |
22 | /* ------------------------------------------------------------------------- */ |
23 | ||
a1b9298e | 24 | /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and |
1da177e4 LT |
25 | Frodo Looijaard <frodol@dds.nl> */ |
26 | ||
1da177e4 LT |
27 | #ifndef _LINUX_I2C_H |
28 | #define _LINUX_I2C_H | |
29 | ||
1da177e4 | 30 | #include <linux/types.h> |
438d6c2c | 31 | #ifdef __KERNEL__ |
a9d1b24d | 32 | #include <linux/mod_devicetable.h> |
1da177e4 | 33 | #include <linux/device.h> /* for struct device */ |
4e57b681 | 34 | #include <linux/sched.h> /* for completion */ |
5c085d36 | 35 | #include <linux/mutex.h> |
d12d42f7 | 36 | #include <linux/of.h> /* for struct device_node */ |
06a67848 | 37 | #include <linux/swab.h> /* for swab16 */ |
1da177e4 | 38 | |
e9ca9eb9 | 39 | extern struct bus_type i2c_bus_type; |
0826374b | 40 | extern struct device_type i2c_adapter_type; |
e9ca9eb9 | 41 | |
1da177e4 LT |
42 | /* --- General options ------------------------------------------------ */ |
43 | ||
44 | struct i2c_msg; | |
45 | struct i2c_algorithm; | |
46 | struct i2c_adapter; | |
47 | struct i2c_client; | |
48 | struct i2c_driver; | |
1da177e4 | 49 | union i2c_smbus_data; |
4735c98f | 50 | struct i2c_board_info; |
1da177e4 | 51 | |
de477254 PG |
52 | struct module; |
53 | ||
23af8400 | 54 | #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
1da177e4 LT |
55 | /* |
56 | * The master routines are the ones normally used to transmit data to devices | |
438d6c2c DB |
57 | * on a bus (or read from them). Apart from two basic transfer functions to |
58 | * transmit one message at a time, a more complex version can be used to | |
1da177e4 | 59 | * transmit an arbitrary number of messages without interruption. |
0c43ea54 | 60 | * @count must be be less than 64k since msg.len is u16. |
1da177e4 | 61 | */ |
0cc43a18 JD |
62 | extern int i2c_master_send(const struct i2c_client *client, const char *buf, |
63 | int count); | |
64 | extern int i2c_master_recv(const struct i2c_client *client, char *buf, | |
3ae70dee | 65 | int count); |
1da177e4 LT |
66 | |
67 | /* Transfer num messages. | |
68 | */ | |
3ae70dee JD |
69 | extern int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, |
70 | int num); | |
1da177e4 LT |
71 | |
72 | /* This is the very generalized SMBus access routine. You probably do not | |
73 | want to use this, though; one of the functions below may be much easier, | |
438d6c2c | 74 | and probably just as fast. |
1da177e4 LT |
75 | Note that we use i2c_adapter here, because you do not need a specific |
76 | smbus adapter to call this function. */ | |
3ae70dee JD |
77 | extern s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, |
78 | unsigned short flags, char read_write, u8 command, | |
79 | int size, union i2c_smbus_data *data); | |
1da177e4 LT |
80 | |
81 | /* Now follow the 'nice' access routines. These also document the calling | |
ae7193f7 | 82 | conventions of i2c_smbus_xfer. */ |
1da177e4 | 83 | |
0cc43a18 JD |
84 | extern s32 i2c_smbus_read_byte(const struct i2c_client *client); |
85 | extern s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value); | |
86 | extern s32 i2c_smbus_read_byte_data(const struct i2c_client *client, | |
87 | u8 command); | |
88 | extern s32 i2c_smbus_write_byte_data(const struct i2c_client *client, | |
3ae70dee | 89 | u8 command, u8 value); |
0cc43a18 JD |
90 | extern s32 i2c_smbus_read_word_data(const struct i2c_client *client, |
91 | u8 command); | |
92 | extern s32 i2c_smbus_write_word_data(const struct i2c_client *client, | |
3ae70dee | 93 | u8 command, u16 value); |
06a67848 JC |
94 | |
95 | static inline s32 | |
96 | i2c_smbus_read_word_swapped(const struct i2c_client *client, u8 command) | |
97 | { | |
98 | s32 value = i2c_smbus_read_word_data(client, command); | |
99 | ||
100 | return (value < 0) ? value : swab16(value); | |
101 | } | |
102 | ||
103 | static inline s32 | |
104 | i2c_smbus_write_word_swapped(const struct i2c_client *client, | |
105 | u8 command, u16 value) | |
106 | { | |
107 | return i2c_smbus_write_word_data(client, command, swab16(value)); | |
108 | } | |
109 | ||
b86a1bc8 | 110 | /* Returns the number of read bytes */ |
0cc43a18 | 111 | extern s32 i2c_smbus_read_block_data(const struct i2c_client *client, |
b86a1bc8 | 112 | u8 command, u8 *values); |
0cc43a18 | 113 | extern s32 i2c_smbus_write_block_data(const struct i2c_client *client, |
3ae70dee | 114 | u8 command, u8 length, const u8 *values); |
31ec5bc5 | 115 | /* Returns the number of read bytes */ |
0cc43a18 | 116 | extern s32 i2c_smbus_read_i2c_block_data(const struct i2c_client *client, |
4b2643d7 | 117 | u8 command, u8 length, u8 *values); |
0cc43a18 | 118 | extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client, |
21bbd691 | 119 | u8 command, u8 length, |
46f5ed75 | 120 | const u8 *values); |
23af8400 | 121 | #endif /* I2C */ |
1da177e4 | 122 | |
4735c98f JD |
123 | /** |
124 | * struct i2c_driver - represent an I2C device driver | |
125 | * @class: What kind of i2c device we instantiate (for detect) | |
fe6fc258 JD |
126 | * @attach_adapter: Callback for bus addition (deprecated) |
127 | * @detach_adapter: Callback for bus removal (deprecated) | |
729d6dd5 JD |
128 | * @probe: Callback for device binding |
129 | * @remove: Callback for device unbinding | |
96e21e4f JD |
130 | * @shutdown: Callback for device shutdown |
131 | * @suspend: Callback for device suspend | |
132 | * @resume: Callback for device resume | |
72d2e9f9 | 133 | * @alert: Alert callback, for example for the SMBus alert protocol |
96e21e4f JD |
134 | * @command: Callback for bus-wide signaling (optional) |
135 | * @driver: Device driver model driver | |
136 | * @id_table: List of I2C devices supported by this driver | |
4735c98f | 137 | * @detect: Callback for device detection |
c3813d6a | 138 | * @address_list: The I2C addresses to probe (for detect) |
4735c98f | 139 | * @clients: List of detected clients we created (for i2c-core use only) |
35d8b2e6 LR |
140 | * |
141 | * The driver.owner field should be set to the module owner of this driver. | |
142 | * The driver.name field should be set to the name of this driver. | |
4735c98f JD |
143 | * |
144 | * For automatic device detection, both @detect and @address_data must | |
145 | * be defined. @class should also be set, otherwise only devices forced | |
146 | * with module parameters will be created. The detect function must | |
147 | * fill at least the name field of the i2c_board_info structure it is | |
148 | * handed upon successful detection, and possibly also the flags field. | |
149 | * | |
150 | * If @detect is missing, the driver will still work fine for enumerated | |
151 | * devices. Detected devices simply won't be supported. This is expected | |
152 | * for the many I2C/SMBus devices which can't be detected reliably, and | |
153 | * the ones which can always be enumerated in practice. | |
154 | * | |
155 | * The i2c_client structure which is handed to the @detect callback is | |
156 | * not a real i2c_client. It is initialized just enough so that you can | |
157 | * call i2c_smbus_read_byte_data and friends on it. Don't do anything | |
158 | * else with it. In particular, calling dev_dbg and friends on it is | |
159 | * not allowed. | |
1da177e4 | 160 | */ |
1da177e4 | 161 | struct i2c_driver { |
1da177e4 | 162 | unsigned int class; |
1da177e4 | 163 | |
729d6dd5 | 164 | /* Notifies the driver that a new bus has appeared or is about to be |
fe6fc258 JD |
165 | * removed. You should avoid using this, it will be removed in a |
166 | * near future. | |
1da177e4 | 167 | */ |
fe6fc258 JD |
168 | int (*attach_adapter)(struct i2c_adapter *) __deprecated; |
169 | int (*detach_adapter)(struct i2c_adapter *) __deprecated; | |
1da177e4 | 170 | |
729d6dd5 | 171 | /* Standard driver model interfaces */ |
d2653e92 | 172 | int (*probe)(struct i2c_client *, const struct i2c_device_id *); |
a1d9e6e4 | 173 | int (*remove)(struct i2c_client *); |
7b4fbc50 | 174 | |
f37dd80a DB |
175 | /* driver model interfaces that don't relate to enumeration */ |
176 | void (*shutdown)(struct i2c_client *); | |
177 | int (*suspend)(struct i2c_client *, pm_message_t mesg); | |
178 | int (*resume)(struct i2c_client *); | |
179 | ||
b5527a77 JD |
180 | /* Alert callback, for example for the SMBus alert protocol. |
181 | * The format and meaning of the data value depends on the protocol. | |
182 | * For the SMBus alert protocol, there is a single bit of data passed | |
183 | * as the alert response's low bit ("event flag"). | |
184 | */ | |
185 | void (*alert)(struct i2c_client *, unsigned int data); | |
186 | ||
1da177e4 LT |
187 | /* a ioctl like command that can be used to perform specific functions |
188 | * with the device. | |
189 | */ | |
3ae70dee | 190 | int (*command)(struct i2c_client *client, unsigned int cmd, void *arg); |
1da177e4 LT |
191 | |
192 | struct device_driver driver; | |
d2653e92 | 193 | const struct i2c_device_id *id_table; |
4735c98f JD |
194 | |
195 | /* Device detection callback for automatic device creation */ | |
310ec792 | 196 | int (*detect)(struct i2c_client *, struct i2c_board_info *); |
c3813d6a | 197 | const unsigned short *address_list; |
4735c98f | 198 | struct list_head clients; |
1da177e4 LT |
199 | }; |
200 | #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver) | |
201 | ||
2096b956 DB |
202 | /** |
203 | * struct i2c_client - represent an I2C slave device | |
d64f73be DB |
204 | * @flags: I2C_CLIENT_TEN indicates the device uses a ten bit chip address; |
205 | * I2C_CLIENT_PEC indicates it uses SMBus Packet Error Checking | |
2096b956 DB |
206 | * @addr: Address used on the I2C bus connected to the parent adapter. |
207 | * @name: Indicates the type of the device, usually a chip name that's | |
208 | * generic enough to hide second-sourcing and compatible revisions. | |
d64f73be | 209 | * @adapter: manages the bus segment hosting this I2C device |
aa3481d5 | 210 | * @driver: device's driver, hence pointer to access routines |
2096b956 | 211 | * @dev: Driver model device node for the slave. |
d64f73be | 212 | * @irq: indicates the IRQ generated by this device (if any) |
99cd8e25 JD |
213 | * @detected: member of an i2c_driver.clients list or i2c-core's |
214 | * userspace_devices list | |
2096b956 DB |
215 | * |
216 | * An i2c_client identifies a single device (i.e. chip) connected to an | |
d64f73be DB |
217 | * i2c bus. The behaviour exposed to Linux is defined by the driver |
218 | * managing the device. | |
1da177e4 LT |
219 | */ |
220 | struct i2c_client { | |
2096b956 | 221 | unsigned short flags; /* div., see below */ |
438d6c2c | 222 | unsigned short addr; /* chip address - NOTE: 7bit */ |
1da177e4 | 223 | /* addresses are stored in the */ |
5071860a | 224 | /* _LOWER_ 7 bits */ |
2096b956 | 225 | char name[I2C_NAME_SIZE]; |
1da177e4 LT |
226 | struct i2c_adapter *adapter; /* the adapter we sit on */ |
227 | struct i2c_driver *driver; /* and our access routines */ | |
1da177e4 | 228 | struct device dev; /* the device structure */ |
8e29da9e | 229 | int irq; /* irq issued by device */ |
4735c98f | 230 | struct list_head detected; |
1da177e4 LT |
231 | }; |
232 | #define to_i2c_client(d) container_of(d, struct i2c_client, dev) | |
233 | ||
9b766b81 DB |
234 | extern struct i2c_client *i2c_verify_client(struct device *dev); |
235 | ||
a61fc683 BG |
236 | static inline struct i2c_client *kobj_to_i2c_client(struct kobject *kobj) |
237 | { | |
d75d53cd MH |
238 | struct device * const dev = container_of(kobj, struct device, kobj); |
239 | return to_i2c_client(dev); | |
a61fc683 BG |
240 | } |
241 | ||
7d1d8999 | 242 | static inline void *i2c_get_clientdata(const struct i2c_client *dev) |
1da177e4 | 243 | { |
3ae70dee | 244 | return dev_get_drvdata(&dev->dev); |
1da177e4 LT |
245 | } |
246 | ||
3ae70dee | 247 | static inline void i2c_set_clientdata(struct i2c_client *dev, void *data) |
1da177e4 | 248 | { |
3ae70dee | 249 | dev_set_drvdata(&dev->dev, data); |
1da177e4 LT |
250 | } |
251 | ||
9c1600ed DB |
252 | /** |
253 | * struct i2c_board_info - template for device creation | |
eb8a7908 | 254 | * @type: chip type, to initialize i2c_client.name |
9c1600ed DB |
255 | * @flags: to initialize i2c_client.flags |
256 | * @addr: stored in i2c_client.addr | |
257 | * @platform_data: stored in i2c_client.dev.platform_data | |
11f1f2af | 258 | * @archdata: copied into i2c_client.dev.archdata |
72d2e9f9 | 259 | * @of_node: pointer to OpenFirmware device node |
9c1600ed | 260 | * @irq: stored in i2c_client.irq |
d64f73be | 261 | * |
9c1600ed DB |
262 | * I2C doesn't actually support hardware probing, although controllers and |
263 | * devices may be able to use I2C_SMBUS_QUICK to tell whether or not there's | |
264 | * a device at a given address. Drivers commonly need more information than | |
265 | * that, such as chip type, configuration, associated IRQ, and so on. | |
266 | * | |
267 | * i2c_board_info is used to build tables of information listing I2C devices | |
729d6dd5 JD |
268 | * that are present. This information is used to grow the driver model tree. |
269 | * For mainboards this is done statically using i2c_register_board_info(); | |
270 | * bus numbers identify adapters that aren't yet available. For add-on boards, | |
271 | * i2c_new_device() does this dynamically with the adapter already known. | |
9c1600ed DB |
272 | */ |
273 | struct i2c_board_info { | |
9c1600ed DB |
274 | char type[I2C_NAME_SIZE]; |
275 | unsigned short flags; | |
276 | unsigned short addr; | |
277 | void *platform_data; | |
11f1f2af | 278 | struct dev_archdata *archdata; |
d12d42f7 | 279 | struct device_node *of_node; |
9c1600ed DB |
280 | int irq; |
281 | }; | |
282 | ||
283 | /** | |
3760f736 JD |
284 | * I2C_BOARD_INFO - macro used to list an i2c device and its address |
285 | * @dev_type: identifies the device type | |
9c1600ed DB |
286 | * @dev_addr: the device's address on the bus. |
287 | * | |
288 | * This macro initializes essential fields of a struct i2c_board_info, | |
289 | * declaring what has been provided on a particular board. Optional | |
3760f736 JD |
290 | * fields (such as associated irq, or device-specific platform_data) |
291 | * are provided using conventional syntax. | |
9c1600ed | 292 | */ |
3ae70dee | 293 | #define I2C_BOARD_INFO(dev_type, dev_addr) \ |
c758e8cf | 294 | .type = dev_type, .addr = (dev_addr) |
9c1600ed DB |
295 | |
296 | ||
23af8400 | 297 | #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
9c1600ed DB |
298 | /* Add-on boards should register/unregister their devices; e.g. a board |
299 | * with integrated I2C, a config eeprom, sensors, and a codec that's | |
300 | * used in conjunction with the primary hardware. | |
301 | */ | |
302 | extern struct i2c_client * | |
303 | i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info); | |
304 | ||
12b5053a JD |
305 | /* If you don't know the exact address of an I2C device, use this variant |
306 | * instead, which can probe for device presence in a list of possible | |
9a94241a JD |
307 | * addresses. The "probe" callback function is optional. If it is provided, |
308 | * it must return 1 on successful probe, 0 otherwise. If it is not provided, | |
309 | * a default probing method is used. | |
12b5053a JD |
310 | */ |
311 | extern struct i2c_client * | |
312 | i2c_new_probed_device(struct i2c_adapter *adap, | |
313 | struct i2c_board_info *info, | |
9a94241a JD |
314 | unsigned short const *addr_list, |
315 | int (*probe)(struct i2c_adapter *, unsigned short addr)); | |
12b5053a | 316 | |
d44f19d5 JD |
317 | /* Common custom probe functions */ |
318 | extern int i2c_probe_func_quick_read(struct i2c_adapter *, unsigned short addr); | |
319 | ||
e9f1373b DB |
320 | /* For devices that use several addresses, use i2c_new_dummy() to make |
321 | * client handles for the extra addresses. | |
322 | */ | |
323 | extern struct i2c_client * | |
60b129d7 | 324 | i2c_new_dummy(struct i2c_adapter *adap, u16 address); |
e9f1373b | 325 | |
9c1600ed | 326 | extern void i2c_unregister_device(struct i2c_client *); |
23af8400 | 327 | #endif /* I2C */ |
9c1600ed DB |
328 | |
329 | /* Mainboard arch_initcall() code should register all its I2C devices. | |
330 | * This is done at arch_initcall time, before declaring any i2c adapters. | |
331 | * Modules for add-on boards must use other calls. | |
332 | */ | |
26386763 | 333 | #ifdef CONFIG_I2C_BOARDINFO |
9c1600ed | 334 | extern int |
3ae70dee JD |
335 | i2c_register_board_info(int busnum, struct i2c_board_info const *info, |
336 | unsigned n); | |
26386763 DB |
337 | #else |
338 | static inline int | |
3ae70dee JD |
339 | i2c_register_board_info(int busnum, struct i2c_board_info const *info, |
340 | unsigned n) | |
26386763 DB |
341 | { |
342 | return 0; | |
343 | } | |
23af8400 | 344 | #endif /* I2C_BOARDINFO */ |
9c1600ed | 345 | |
1da177e4 LT |
346 | /* |
347 | * The following structs are for those who like to implement new bus drivers: | |
348 | * i2c_algorithm is the interface to a class of hardware solutions which can | |
349 | * be addressed using the same bus algorithms - i.e. bit-banging or the PCF8584 | |
350 | * to name two of the most common. | |
351 | */ | |
352 | struct i2c_algorithm { | |
1da177e4 | 353 | /* If an adapter algorithm can't do I2C-level access, set master_xfer |
438d6c2c | 354 | to NULL. If an adapter algorithm can do SMBus access, set |
1da177e4 LT |
355 | smbus_xfer. If set to NULL, the SMBus protocol is simulated |
356 | using common I2C messages */ | |
8ced8eee JD |
357 | /* master_xfer should return the number of messages successfully |
358 | processed, or a negative value on error */ | |
3ae70dee JD |
359 | int (*master_xfer)(struct i2c_adapter *adap, struct i2c_msg *msgs, |
360 | int num); | |
438d6c2c | 361 | int (*smbus_xfer) (struct i2c_adapter *adap, u16 addr, |
3ae70dee JD |
362 | unsigned short flags, char read_write, |
363 | u8 command, int size, union i2c_smbus_data *data); | |
1da177e4 | 364 | |
1da177e4 LT |
365 | /* To determine what the adapter supports */ |
366 | u32 (*functionality) (struct i2c_adapter *); | |
367 | }; | |
368 | ||
369 | /* | |
370 | * i2c_adapter is the structure used to identify a physical i2c bus along | |
371 | * with the access algorithms necessary to access it. | |
372 | */ | |
373 | struct i2c_adapter { | |
374 | struct module *owner; | |
14f55f7a | 375 | unsigned int class; /* classes to allow probing for */ |
af71ff69 | 376 | const struct i2c_algorithm *algo; /* the algorithm to access the bus */ |
1da177e4 LT |
377 | void *algo_data; |
378 | ||
1da177e4 | 379 | /* data fields that are valid for all devices */ |
194684e5 | 380 | struct rt_mutex bus_lock; |
1da177e4 | 381 | |
cd97f39b | 382 | int timeout; /* in jiffies */ |
1da177e4 LT |
383 | int retries; |
384 | struct device dev; /* the adapter device */ | |
1da177e4 | 385 | |
1da177e4 | 386 | int nr; |
2096b956 | 387 | char name[48]; |
1da177e4 | 388 | struct completion dev_released; |
6629dcff | 389 | |
dafc50d1 | 390 | struct mutex userspace_clients_lock; |
6629dcff | 391 | struct list_head userspace_clients; |
1da177e4 | 392 | }; |
ef2c8321 | 393 | #define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev) |
1da177e4 | 394 | |
7d1d8999 | 395 | static inline void *i2c_get_adapdata(const struct i2c_adapter *dev) |
1da177e4 | 396 | { |
3ae70dee | 397 | return dev_get_drvdata(&dev->dev); |
1da177e4 LT |
398 | } |
399 | ||
3ae70dee | 400 | static inline void i2c_set_adapdata(struct i2c_adapter *dev, void *data) |
1da177e4 | 401 | { |
3ae70dee | 402 | dev_set_drvdata(&dev->dev, data); |
1da177e4 LT |
403 | } |
404 | ||
97cc4d49 JD |
405 | static inline struct i2c_adapter * |
406 | i2c_parent_is_i2c_adapter(const struct i2c_adapter *adapter) | |
0826374b | 407 | { |
97cc4d49 JD |
408 | struct device *parent = adapter->dev.parent; |
409 | ||
410 | if (parent != NULL && parent->type == &i2c_adapter_type) | |
411 | return to_i2c_adapter(parent); | |
412 | else | |
413 | return NULL; | |
0826374b ML |
414 | } |
415 | ||
7ae31482 JD |
416 | int i2c_for_each_dev(void *data, int (*fn)(struct device *, void *)); |
417 | ||
fe61e07e JD |
418 | /* Adapter locking functions, exported for shared pin cases */ |
419 | void i2c_lock_adapter(struct i2c_adapter *); | |
420 | void i2c_unlock_adapter(struct i2c_adapter *); | |
afa08974 | 421 | |
1da177e4 | 422 | /*flags for the client struct: */ |
3bbb835d DB |
423 | #define I2C_CLIENT_PEC 0x04 /* Use Packet Error Checking */ |
424 | #define I2C_CLIENT_TEN 0x10 /* we have a ten bit chip address */ | |
425 | /* Must equal I2C_M_TEN below */ | |
426 | #define I2C_CLIENT_WAKE 0x80 /* for board_info; true iff can wake */ | |
1da177e4 LT |
427 | |
428 | /* i2c adapter classes (bitmask) */ | |
429 | #define I2C_CLASS_HWMON (1<<0) /* lm_sensors, ... */ | |
c1b6b4f2 | 430 | #define I2C_CLASS_DDC (1<<3) /* DDC bus on graphics adapters */ |
774466ad | 431 | #define I2C_CLASS_SPD (1<<7) /* Memory modules */ |
1da177e4 | 432 | |
1da177e4 LT |
433 | /* Internal numbers to terminate lists */ |
434 | #define I2C_CLIENT_END 0xfffeU | |
1da177e4 | 435 | |
c7036673 HV |
436 | /* Construct an I2C_CLIENT_END-terminated array of i2c addresses */ |
437 | #define I2C_ADDRS(addr, addrs...) \ | |
438 | ((const unsigned short []){ addr, ## addrs, I2C_CLIENT_END }) | |
439 | ||
1da177e4 LT |
440 | |
441 | /* ----- functions exported by i2c.o */ | |
442 | ||
443 | /* administration... | |
444 | */ | |
23af8400 | 445 | #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE) |
1da177e4 LT |
446 | extern int i2c_add_adapter(struct i2c_adapter *); |
447 | extern int i2c_del_adapter(struct i2c_adapter *); | |
6e13e641 | 448 | extern int i2c_add_numbered_adapter(struct i2c_adapter *); |
1da177e4 | 449 | |
de59cf9e | 450 | extern int i2c_register_driver(struct module *, struct i2c_driver *); |
b3e82096 | 451 | extern void i2c_del_driver(struct i2c_driver *); |
1da177e4 | 452 | |
eb5589a8 PG |
453 | /* use a define to avoid include chaining to get THIS_MODULE */ |
454 | #define i2c_add_driver(driver) \ | |
455 | i2c_register_driver(THIS_MODULE, driver) | |
de59cf9e | 456 | |
e48d3319 JD |
457 | extern struct i2c_client *i2c_use_client(struct i2c_client *client); |
458 | extern void i2c_release_client(struct i2c_client *client); | |
1da177e4 LT |
459 | |
460 | /* call the i2c_client->command() of all attached clients with | |
461 | * the given arguments */ | |
462 | extern void i2c_clients_command(struct i2c_adapter *adap, | |
463 | unsigned int cmd, void *arg); | |
464 | ||
d735b34d | 465 | extern struct i2c_adapter *i2c_get_adapter(int nr); |
1da177e4 LT |
466 | extern void i2c_put_adapter(struct i2c_adapter *adap); |
467 | ||
468 | ||
469 | /* Return the functionality mask */ | |
470 | static inline u32 i2c_get_functionality(struct i2c_adapter *adap) | |
471 | { | |
472 | return adap->algo->functionality(adap); | |
473 | } | |
474 | ||
475 | /* Return 1 if adapter supports everything we need, 0 if not. */ | |
476 | static inline int i2c_check_functionality(struct i2c_adapter *adap, u32 func) | |
477 | { | |
478 | return (func & i2c_get_functionality(adap)) == func; | |
479 | } | |
480 | ||
3ae70dee | 481 | /* Return the adapter number for a specific adapter */ |
cdcb1921 JD |
482 | static inline int i2c_adapter_id(struct i2c_adapter *adap) |
483 | { | |
484 | return adap->nr; | |
485 | } | |
7c92784a LPC |
486 | |
487 | /** | |
488 | * module_i2c_driver() - Helper macro for registering a I2C driver | |
489 | * @__i2c_driver: i2c_driver struct | |
490 | * | |
491 | * Helper macro for I2C drivers which do not do anything special in module | |
492 | * init/exit. This eliminates a lot of boilerplate. Each module may only | |
493 | * use this macro once, and calling it replaces module_init() and module_exit() | |
494 | */ | |
495 | #define module_i2c_driver(__i2c_driver) \ | |
496 | module_driver(__i2c_driver, i2c_add_driver, \ | |
497 | i2c_del_driver) | |
498 | ||
23af8400 | 499 | #endif /* I2C */ |
a1b9298e | 500 | #endif /* __KERNEL__ */ |
cdcb1921 | 501 | |
a64ec07d DB |
502 | /** |
503 | * struct i2c_msg - an I2C transaction segment beginning with START | |
504 | * @addr: Slave address, either seven or ten bits. When this is a ten | |
505 | * bit address, I2C_M_TEN must be set in @flags and the adapter | |
506 | * must support I2C_FUNC_10BIT_ADDR. | |
507 | * @flags: I2C_M_RD is handled by all adapters. No other flags may be | |
508 | * provided unless the adapter exported the relevant I2C_FUNC_* | |
509 | * flags through i2c_check_functionality(). | |
510 | * @len: Number of data bytes in @buf being read from or written to the | |
511 | * I2C slave address. For read transactions where I2C_M_RECV_LEN | |
512 | * is set, the caller guarantees that this buffer can hold up to | |
513 | * 32 bytes in addition to the initial length byte sent by the | |
514 | * slave (plus, if used, the SMBus PEC); and this value will be | |
515 | * incremented by the number of block data bytes received. | |
516 | * @buf: The buffer into which data is read, or from which it's written. | |
517 | * | |
518 | * An i2c_msg is the low level representation of one segment of an I2C | |
519 | * transaction. It is visible to drivers in the @i2c_transfer() procedure, | |
520 | * to userspace from i2c-dev, and to I2C adapter drivers through the | |
521 | * @i2c_adapter.@master_xfer() method. | |
522 | * | |
523 | * Except when I2C "protocol mangling" is used, all I2C adapters implement | |
524 | * the standard rules for I2C transactions. Each transaction begins with a | |
525 | * START. That is followed by the slave address, and a bit encoding read | |
526 | * versus write. Then follow all the data bytes, possibly including a byte | |
527 | * with SMBus PEC. The transfer terminates with a NAK, or when all those | |
528 | * bytes have been transferred and ACKed. If this is the last message in a | |
529 | * group, it is followed by a STOP. Otherwise it is followed by the next | |
530 | * @i2c_msg transaction segment, beginning with a (repeated) START. | |
531 | * | |
532 | * Alternatively, when the adapter supports I2C_FUNC_PROTOCOL_MANGLING then | |
533 | * passing certain @flags may have changed those standard protocol behaviors. | |
534 | * Those flags are only for use with broken/nonconforming slaves, and with | |
535 | * adapters which are known to support the specific mangling options they | |
536 | * need (one or more of IGNORE_NAK, NO_RD_ACK, NOSTART, and REV_DIR_ADDR). | |
1da177e4 LT |
537 | */ |
538 | struct i2c_msg { | |
539 | __u16 addr; /* slave address */ | |
438d6c2c | 540 | __u16 flags; |
a64ec07d DB |
541 | #define I2C_M_TEN 0x0010 /* this is a ten bit chip address */ |
542 | #define I2C_M_RD 0x0001 /* read data, from slave to master */ | |
543 | #define I2C_M_NOSTART 0x4000 /* if I2C_FUNC_PROTOCOL_MANGLING */ | |
544 | #define I2C_M_REV_DIR_ADDR 0x2000 /* if I2C_FUNC_PROTOCOL_MANGLING */ | |
545 | #define I2C_M_IGNORE_NAK 0x1000 /* if I2C_FUNC_PROTOCOL_MANGLING */ | |
546 | #define I2C_M_NO_RD_ACK 0x0800 /* if I2C_FUNC_PROTOCOL_MANGLING */ | |
547 | #define I2C_M_RECV_LEN 0x0400 /* length will be first received byte */ | |
438d6c2c DB |
548 | __u16 len; /* msg length */ |
549 | __u8 *buf; /* pointer to msg data */ | |
1da177e4 LT |
550 | }; |
551 | ||
552 | /* To determine what functionality is present */ | |
553 | ||
554 | #define I2C_FUNC_I2C 0x00000001 | |
555 | #define I2C_FUNC_10BIT_ADDR 0x00000002 | |
3ae70dee | 556 | #define I2C_FUNC_PROTOCOL_MANGLING 0x00000004 /* I2C_M_NOSTART etc. */ |
6662cbb9 | 557 | #define I2C_FUNC_SMBUS_PEC 0x00000008 |
1da177e4 | 558 | #define I2C_FUNC_SMBUS_BLOCK_PROC_CALL 0x00008000 /* SMBus 2.0 */ |
438d6c2c DB |
559 | #define I2C_FUNC_SMBUS_QUICK 0x00010000 |
560 | #define I2C_FUNC_SMBUS_READ_BYTE 0x00020000 | |
561 | #define I2C_FUNC_SMBUS_WRITE_BYTE 0x00040000 | |
562 | #define I2C_FUNC_SMBUS_READ_BYTE_DATA 0x00080000 | |
563 | #define I2C_FUNC_SMBUS_WRITE_BYTE_DATA 0x00100000 | |
564 | #define I2C_FUNC_SMBUS_READ_WORD_DATA 0x00200000 | |
565 | #define I2C_FUNC_SMBUS_WRITE_WORD_DATA 0x00400000 | |
566 | #define I2C_FUNC_SMBUS_PROC_CALL 0x00800000 | |
567 | #define I2C_FUNC_SMBUS_READ_BLOCK_DATA 0x01000000 | |
568 | #define I2C_FUNC_SMBUS_WRITE_BLOCK_DATA 0x02000000 | |
1da177e4 LT |
569 | #define I2C_FUNC_SMBUS_READ_I2C_BLOCK 0x04000000 /* I2C-like block xfer */ |
570 | #define I2C_FUNC_SMBUS_WRITE_I2C_BLOCK 0x08000000 /* w/ 1-byte reg. addr. */ | |
1da177e4 | 571 | |
3ae70dee JD |
572 | #define I2C_FUNC_SMBUS_BYTE (I2C_FUNC_SMBUS_READ_BYTE | \ |
573 | I2C_FUNC_SMBUS_WRITE_BYTE) | |
574 | #define I2C_FUNC_SMBUS_BYTE_DATA (I2C_FUNC_SMBUS_READ_BYTE_DATA | \ | |
575 | I2C_FUNC_SMBUS_WRITE_BYTE_DATA) | |
576 | #define I2C_FUNC_SMBUS_WORD_DATA (I2C_FUNC_SMBUS_READ_WORD_DATA | \ | |
577 | I2C_FUNC_SMBUS_WRITE_WORD_DATA) | |
578 | #define I2C_FUNC_SMBUS_BLOCK_DATA (I2C_FUNC_SMBUS_READ_BLOCK_DATA | \ | |
579 | I2C_FUNC_SMBUS_WRITE_BLOCK_DATA) | |
580 | #define I2C_FUNC_SMBUS_I2C_BLOCK (I2C_FUNC_SMBUS_READ_I2C_BLOCK | \ | |
581 | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK) | |
582 | ||
583 | #define I2C_FUNC_SMBUS_EMUL (I2C_FUNC_SMBUS_QUICK | \ | |
584 | I2C_FUNC_SMBUS_BYTE | \ | |
585 | I2C_FUNC_SMBUS_BYTE_DATA | \ | |
586 | I2C_FUNC_SMBUS_WORD_DATA | \ | |
587 | I2C_FUNC_SMBUS_PROC_CALL | \ | |
588 | I2C_FUNC_SMBUS_WRITE_BLOCK_DATA | \ | |
589 | I2C_FUNC_SMBUS_I2C_BLOCK | \ | |
590 | I2C_FUNC_SMBUS_PEC) | |
1da177e4 | 591 | |
438d6c2c DB |
592 | /* |
593 | * Data for SMBus Messages | |
1da177e4 | 594 | */ |
438d6c2c | 595 | #define I2C_SMBUS_BLOCK_MAX 32 /* As specified in SMBus standard */ |
1da177e4 LT |
596 | union i2c_smbus_data { |
597 | __u8 byte; | |
598 | __u16 word; | |
332bf92b | 599 | __u8 block[I2C_SMBUS_BLOCK_MAX + 2]; /* block[0] is used for length */ |
3ae70dee | 600 | /* and one more for user-space compatibility */ |
1da177e4 LT |
601 | }; |
602 | ||
ae7193f7 | 603 | /* i2c_smbus_xfer read or write markers */ |
1da177e4 LT |
604 | #define I2C_SMBUS_READ 1 |
605 | #define I2C_SMBUS_WRITE 0 | |
606 | ||
438d6c2c | 607 | /* SMBus transaction types (size parameter in the above functions) |
1da177e4 LT |
608 | Note: these no longer correspond to the (arbitrary) PIIX4 internal codes! */ |
609 | #define I2C_SMBUS_QUICK 0 | |
610 | #define I2C_SMBUS_BYTE 1 | |
438d6c2c | 611 | #define I2C_SMBUS_BYTE_DATA 2 |
1da177e4 LT |
612 | #define I2C_SMBUS_WORD_DATA 3 |
613 | #define I2C_SMBUS_PROC_CALL 4 | |
614 | #define I2C_SMBUS_BLOCK_DATA 5 | |
4b2643d7 | 615 | #define I2C_SMBUS_I2C_BLOCK_BROKEN 6 |
1da177e4 | 616 | #define I2C_SMBUS_BLOCK_PROC_CALL 7 /* SMBus 2.0 */ |
4b2643d7 | 617 | #define I2C_SMBUS_I2C_BLOCK_DATA 8 |
1da177e4 | 618 | |
1da177e4 | 619 | #endif /* _LINUX_I2C_H */ |