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Commit | Line | Data |
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1da177e4 LT |
1 | /* i2c-core.c - a device driver for the iic-bus interface */ |
2 | /* ------------------------------------------------------------------------- */ | |
3 | /* Copyright (C) 1995-99 Simon G. Vogl | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
18 | /* ------------------------------------------------------------------------- */ | |
19 | ||
96de0e25 | 20 | /* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi>. |
1da177e4 | 21 | All SMBus-related things are written by Frodo Looijaard <frodol@dds.nl> |
421ef47b JD |
22 | SMBus 2.0 support by Mark Studebaker <mdsxyz123@yahoo.com> and |
23 | Jean Delvare <khali@linux-fr.org> */ | |
1da177e4 | 24 | |
1da177e4 LT |
25 | #include <linux/module.h> |
26 | #include <linux/kernel.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/i2c.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/idr.h> | |
32 | #include <linux/seq_file.h> | |
d052d1be | 33 | #include <linux/platform_device.h> |
b3585e4f | 34 | #include <linux/mutex.h> |
b8d6f45b | 35 | #include <linux/completion.h> |
cea443a8 MR |
36 | #include <linux/hardirq.h> |
37 | #include <linux/irqflags.h> | |
1da177e4 | 38 | #include <asm/uaccess.h> |
87c6c229 | 39 | #include <asm/semaphore.h> |
1da177e4 | 40 | |
9c1600ed DB |
41 | #include "i2c-core.h" |
42 | ||
1da177e4 | 43 | |
caada32a | 44 | static DEFINE_MUTEX(core_lock); |
1da177e4 LT |
45 | static DEFINE_IDR(i2c_adapter_idr); |
46 | ||
a1d9e6e4 | 47 | #define is_newstyle_driver(d) ((d)->probe || (d)->remove) |
f37dd80a DB |
48 | |
49 | /* ------------------------------------------------------------------------- */ | |
50 | ||
1da177e4 LT |
51 | static int i2c_device_match(struct device *dev, struct device_driver *drv) |
52 | { | |
7b4fbc50 DB |
53 | struct i2c_client *client = to_i2c_client(dev); |
54 | struct i2c_driver *driver = to_i2c_driver(drv); | |
55 | ||
56 | /* make legacy i2c drivers bypass driver model probing entirely; | |
57 | * such drivers scan each i2c adapter/bus themselves. | |
58 | */ | |
a1d9e6e4 | 59 | if (!is_newstyle_driver(driver)) |
7b4fbc50 DB |
60 | return 0; |
61 | ||
62 | /* new style drivers use the same kind of driver matching policy | |
63 | * as platform devices or SPI: compare device and driver IDs. | |
64 | */ | |
65 | return strcmp(client->driver_name, drv->name) == 0; | |
1da177e4 LT |
66 | } |
67 | ||
7b4fbc50 DB |
68 | #ifdef CONFIG_HOTPLUG |
69 | ||
70 | /* uevent helps with hotplug: modprobe -q $(MODALIAS) */ | |
7eff2e7a | 71 | static int i2c_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
7b4fbc50 DB |
72 | { |
73 | struct i2c_client *client = to_i2c_client(dev); | |
7b4fbc50 DB |
74 | |
75 | /* by definition, legacy drivers can't hotplug */ | |
76 | if (dev->driver || !client->driver_name) | |
77 | return 0; | |
78 | ||
7eff2e7a | 79 | if (add_uevent_var(env, "MODALIAS=%s", client->driver_name)) |
7b4fbc50 | 80 | return -ENOMEM; |
7b4fbc50 DB |
81 | dev_dbg(dev, "uevent\n"); |
82 | return 0; | |
83 | } | |
84 | ||
85 | #else | |
86 | #define i2c_device_uevent NULL | |
87 | #endif /* CONFIG_HOTPLUG */ | |
88 | ||
f37dd80a | 89 | static int i2c_device_probe(struct device *dev) |
1da177e4 | 90 | { |
7b4fbc50 DB |
91 | struct i2c_client *client = to_i2c_client(dev); |
92 | struct i2c_driver *driver = to_i2c_driver(dev->driver); | |
93 | ||
94 | if (!driver->probe) | |
95 | return -ENODEV; | |
96 | client->driver = driver; | |
97 | dev_dbg(dev, "probe\n"); | |
98 | return driver->probe(client); | |
f37dd80a | 99 | } |
1da177e4 | 100 | |
f37dd80a DB |
101 | static int i2c_device_remove(struct device *dev) |
102 | { | |
a1d9e6e4 DB |
103 | struct i2c_client *client = to_i2c_client(dev); |
104 | struct i2c_driver *driver; | |
105 | int status; | |
106 | ||
107 | if (!dev->driver) | |
108 | return 0; | |
109 | ||
110 | driver = to_i2c_driver(dev->driver); | |
111 | if (driver->remove) { | |
112 | dev_dbg(dev, "remove\n"); | |
113 | status = driver->remove(client); | |
114 | } else { | |
115 | dev->driver = NULL; | |
116 | status = 0; | |
117 | } | |
118 | if (status == 0) | |
119 | client->driver = NULL; | |
120 | return status; | |
1da177e4 LT |
121 | } |
122 | ||
f37dd80a | 123 | static void i2c_device_shutdown(struct device *dev) |
1da177e4 | 124 | { |
f37dd80a DB |
125 | struct i2c_driver *driver; |
126 | ||
127 | if (!dev->driver) | |
128 | return; | |
129 | driver = to_i2c_driver(dev->driver); | |
130 | if (driver->shutdown) | |
131 | driver->shutdown(to_i2c_client(dev)); | |
1da177e4 LT |
132 | } |
133 | ||
f37dd80a | 134 | static int i2c_device_suspend(struct device * dev, pm_message_t mesg) |
1da177e4 | 135 | { |
f37dd80a DB |
136 | struct i2c_driver *driver; |
137 | ||
138 | if (!dev->driver) | |
139 | return 0; | |
140 | driver = to_i2c_driver(dev->driver); | |
141 | if (!driver->suspend) | |
142 | return 0; | |
143 | return driver->suspend(to_i2c_client(dev), mesg); | |
1da177e4 LT |
144 | } |
145 | ||
f37dd80a | 146 | static int i2c_device_resume(struct device * dev) |
1da177e4 | 147 | { |
f37dd80a DB |
148 | struct i2c_driver *driver; |
149 | ||
150 | if (!dev->driver) | |
151 | return 0; | |
152 | driver = to_i2c_driver(dev->driver); | |
153 | if (!driver->resume) | |
154 | return 0; | |
155 | return driver->resume(to_i2c_client(dev)); | |
1da177e4 LT |
156 | } |
157 | ||
7b4fbc50 DB |
158 | static void i2c_client_release(struct device *dev) |
159 | { | |
160 | struct i2c_client *client = to_i2c_client(dev); | |
161 | complete(&client->released); | |
162 | } | |
163 | ||
9c1600ed DB |
164 | static void i2c_client_dev_release(struct device *dev) |
165 | { | |
166 | kfree(to_i2c_client(dev)); | |
167 | } | |
168 | ||
7b4fbc50 DB |
169 | static ssize_t show_client_name(struct device *dev, struct device_attribute *attr, char *buf) |
170 | { | |
171 | struct i2c_client *client = to_i2c_client(dev); | |
172 | return sprintf(buf, "%s\n", client->name); | |
173 | } | |
174 | ||
175 | static ssize_t show_modalias(struct device *dev, struct device_attribute *attr, char *buf) | |
176 | { | |
177 | struct i2c_client *client = to_i2c_client(dev); | |
178 | return client->driver_name | |
179 | ? sprintf(buf, "%s\n", client->driver_name) | |
180 | : 0; | |
181 | } | |
182 | ||
183 | static struct device_attribute i2c_dev_attrs[] = { | |
184 | __ATTR(name, S_IRUGO, show_client_name, NULL), | |
185 | /* modalias helps coldplug: modprobe $(cat .../modalias) */ | |
186 | __ATTR(modalias, S_IRUGO, show_modalias, NULL), | |
187 | { }, | |
188 | }; | |
189 | ||
83eaaed0 | 190 | static struct bus_type i2c_bus_type = { |
f37dd80a | 191 | .name = "i2c", |
7b4fbc50 | 192 | .dev_attrs = i2c_dev_attrs, |
f37dd80a | 193 | .match = i2c_device_match, |
7b4fbc50 | 194 | .uevent = i2c_device_uevent, |
f37dd80a DB |
195 | .probe = i2c_device_probe, |
196 | .remove = i2c_device_remove, | |
197 | .shutdown = i2c_device_shutdown, | |
198 | .suspend = i2c_device_suspend, | |
199 | .resume = i2c_device_resume, | |
b864c7d5 RK |
200 | }; |
201 | ||
9b766b81 DB |
202 | |
203 | /** | |
204 | * i2c_verify_client - return parameter as i2c_client, or NULL | |
205 | * @dev: device, probably from some driver model iterator | |
206 | * | |
207 | * When traversing the driver model tree, perhaps using driver model | |
208 | * iterators like @device_for_each_child(), you can't assume very much | |
209 | * about the nodes you find. Use this function to avoid oopses caused | |
210 | * by wrongly treating some non-I2C device as an i2c_client. | |
211 | */ | |
212 | struct i2c_client *i2c_verify_client(struct device *dev) | |
213 | { | |
214 | return (dev->bus == &i2c_bus_type) | |
215 | ? to_i2c_client(dev) | |
216 | : NULL; | |
217 | } | |
218 | EXPORT_SYMBOL(i2c_verify_client); | |
219 | ||
220 | ||
9c1600ed DB |
221 | /** |
222 | * i2c_new_device - instantiate an i2c device for use with a new style driver | |
223 | * @adap: the adapter managing the device | |
224 | * @info: describes one I2C device; bus_num is ignored | |
d64f73be | 225 | * Context: can sleep |
9c1600ed DB |
226 | * |
227 | * Create a device to work with a new style i2c driver, where binding is | |
228 | * handled through driver model probe()/remove() methods. This call is not | |
229 | * appropriate for use by mainboad initialization logic, which usually runs | |
230 | * during an arch_initcall() long before any i2c_adapter could exist. | |
231 | * | |
232 | * This returns the new i2c client, which may be saved for later use with | |
233 | * i2c_unregister_device(); or NULL to indicate an error. | |
234 | */ | |
235 | struct i2c_client * | |
236 | i2c_new_device(struct i2c_adapter *adap, struct i2c_board_info const *info) | |
237 | { | |
238 | struct i2c_client *client; | |
239 | int status; | |
240 | ||
241 | client = kzalloc(sizeof *client, GFP_KERNEL); | |
242 | if (!client) | |
243 | return NULL; | |
244 | ||
245 | client->adapter = adap; | |
246 | ||
247 | client->dev.platform_data = info->platform_data; | |
3bbb835d DB |
248 | device_init_wakeup(&client->dev, info->flags & I2C_CLIENT_WAKE); |
249 | ||
250 | client->flags = info->flags & ~I2C_CLIENT_WAKE; | |
9c1600ed DB |
251 | client->addr = info->addr; |
252 | client->irq = info->irq; | |
253 | ||
254 | strlcpy(client->driver_name, info->driver_name, | |
255 | sizeof(client->driver_name)); | |
256 | strlcpy(client->name, info->type, sizeof(client->name)); | |
257 | ||
258 | /* a new style driver may be bound to this device when we | |
259 | * return from this function, or any later moment (e.g. maybe | |
260 | * hotplugging will load the driver module). and the device | |
261 | * refcount model is the standard driver model one. | |
262 | */ | |
263 | status = i2c_attach_client(client); | |
264 | if (status < 0) { | |
265 | kfree(client); | |
266 | client = NULL; | |
267 | } | |
268 | return client; | |
269 | } | |
270 | EXPORT_SYMBOL_GPL(i2c_new_device); | |
271 | ||
272 | ||
273 | /** | |
274 | * i2c_unregister_device - reverse effect of i2c_new_device() | |
275 | * @client: value returned from i2c_new_device() | |
d64f73be | 276 | * Context: can sleep |
9c1600ed DB |
277 | */ |
278 | void i2c_unregister_device(struct i2c_client *client) | |
a1d9e6e4 DB |
279 | { |
280 | struct i2c_adapter *adapter = client->adapter; | |
281 | struct i2c_driver *driver = client->driver; | |
282 | ||
283 | if (driver && !is_newstyle_driver(driver)) { | |
284 | dev_err(&client->dev, "can't unregister devices " | |
285 | "with legacy drivers\n"); | |
286 | WARN_ON(1); | |
287 | return; | |
288 | } | |
289 | ||
290 | mutex_lock(&adapter->clist_lock); | |
291 | list_del(&client->list); | |
292 | mutex_unlock(&adapter->clist_lock); | |
293 | ||
294 | device_unregister(&client->dev); | |
295 | } | |
9c1600ed | 296 | EXPORT_SYMBOL_GPL(i2c_unregister_device); |
a1d9e6e4 DB |
297 | |
298 | ||
f37dd80a DB |
299 | /* ------------------------------------------------------------------------- */ |
300 | ||
16ffadfc DB |
301 | /* I2C bus adapters -- one roots each I2C or SMBUS segment */ |
302 | ||
83eaaed0 | 303 | static void i2c_adapter_dev_release(struct device *dev) |
1da177e4 | 304 | { |
ef2c8321 | 305 | struct i2c_adapter *adap = to_i2c_adapter(dev); |
1da177e4 LT |
306 | complete(&adap->dev_released); |
307 | } | |
308 | ||
16ffadfc DB |
309 | static ssize_t |
310 | show_adapter_name(struct device *dev, struct device_attribute *attr, char *buf) | |
311 | { | |
ef2c8321 | 312 | struct i2c_adapter *adap = to_i2c_adapter(dev); |
16ffadfc DB |
313 | return sprintf(buf, "%s\n", adap->name); |
314 | } | |
b119dc3f | 315 | |
16ffadfc DB |
316 | static struct device_attribute i2c_adapter_attrs[] = { |
317 | __ATTR(name, S_IRUGO, show_adapter_name, NULL), | |
318 | { }, | |
319 | }; | |
b119dc3f | 320 | |
83eaaed0 | 321 | static struct class i2c_adapter_class = { |
b119dc3f DB |
322 | .owner = THIS_MODULE, |
323 | .name = "i2c-adapter", | |
16ffadfc | 324 | .dev_attrs = i2c_adapter_attrs, |
1da177e4 LT |
325 | }; |
326 | ||
9c1600ed DB |
327 | static void i2c_scan_static_board_info(struct i2c_adapter *adapter) |
328 | { | |
329 | struct i2c_devinfo *devinfo; | |
330 | ||
331 | mutex_lock(&__i2c_board_lock); | |
332 | list_for_each_entry(devinfo, &__i2c_board_list, list) { | |
333 | if (devinfo->busnum == adapter->nr | |
334 | && !i2c_new_device(adapter, | |
335 | &devinfo->board_info)) | |
336 | printk(KERN_ERR "i2c-core: can't create i2c%d-%04x\n", | |
337 | i2c_adapter_id(adapter), | |
338 | devinfo->board_info.addr); | |
339 | } | |
340 | mutex_unlock(&__i2c_board_lock); | |
341 | } | |
342 | ||
026526f5 JD |
343 | static int i2c_do_add_adapter(struct device_driver *d, void *data) |
344 | { | |
345 | struct i2c_driver *driver = to_i2c_driver(d); | |
346 | struct i2c_adapter *adap = data; | |
347 | ||
348 | if (driver->attach_adapter) { | |
349 | /* We ignore the return code; if it fails, too bad */ | |
350 | driver->attach_adapter(adap); | |
351 | } | |
352 | return 0; | |
353 | } | |
354 | ||
6e13e641 | 355 | static int i2c_register_adapter(struct i2c_adapter *adap) |
1da177e4 | 356 | { |
026526f5 | 357 | int res = 0, dummy; |
1da177e4 | 358 | |
5c085d36 IM |
359 | mutex_init(&adap->bus_lock); |
360 | mutex_init(&adap->clist_lock); | |
1da177e4 LT |
361 | INIT_LIST_HEAD(&adap->clients); |
362 | ||
caada32a | 363 | mutex_lock(&core_lock); |
6e13e641 | 364 | |
1da177e4 LT |
365 | /* Add the adapter to the driver core. |
366 | * If the parent pointer is not set up, | |
367 | * we add this adapter to the host bus. | |
368 | */ | |
b119dc3f | 369 | if (adap->dev.parent == NULL) { |
1da177e4 | 370 | adap->dev.parent = &platform_bus; |
fe2c8d51 JD |
371 | pr_debug("I2C adapter driver [%s] forgot to specify " |
372 | "physical device\n", adap->name); | |
b119dc3f | 373 | } |
1da177e4 | 374 | sprintf(adap->dev.bus_id, "i2c-%d", adap->nr); |
1da177e4 | 375 | adap->dev.release = &i2c_adapter_dev_release; |
fccb56e4 | 376 | adap->dev.class = &i2c_adapter_class; |
b119c6c9 JD |
377 | res = device_register(&adap->dev); |
378 | if (res) | |
379 | goto out_list; | |
1da177e4 | 380 | |
b6d7b3d1 JD |
381 | dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name); |
382 | ||
6e13e641 DB |
383 | /* create pre-declared device nodes for new-style drivers */ |
384 | if (adap->nr < __i2c_first_dynamic_bus_num) | |
385 | i2c_scan_static_board_info(adap); | |
386 | ||
7b4fbc50 | 387 | /* let legacy drivers scan this bus for matching devices */ |
026526f5 JD |
388 | dummy = bus_for_each_drv(&i2c_bus_type, NULL, adap, |
389 | i2c_do_add_adapter); | |
1da177e4 | 390 | |
1da177e4 | 391 | out_unlock: |
caada32a | 392 | mutex_unlock(&core_lock); |
1da177e4 | 393 | return res; |
b119c6c9 | 394 | |
b119c6c9 | 395 | out_list: |
b119c6c9 JD |
396 | idr_remove(&i2c_adapter_idr, adap->nr); |
397 | goto out_unlock; | |
1da177e4 LT |
398 | } |
399 | ||
6e13e641 DB |
400 | /** |
401 | * i2c_add_adapter - declare i2c adapter, use dynamic bus number | |
402 | * @adapter: the adapter to add | |
d64f73be | 403 | * Context: can sleep |
6e13e641 DB |
404 | * |
405 | * This routine is used to declare an I2C adapter when its bus number | |
406 | * doesn't matter. Examples: for I2C adapters dynamically added by | |
407 | * USB links or PCI plugin cards. | |
408 | * | |
409 | * When this returns zero, a new bus number was allocated and stored | |
410 | * in adap->nr, and the specified adapter became available for clients. | |
411 | * Otherwise, a negative errno value is returned. | |
412 | */ | |
413 | int i2c_add_adapter(struct i2c_adapter *adapter) | |
414 | { | |
415 | int id, res = 0; | |
416 | ||
417 | retry: | |
418 | if (idr_pre_get(&i2c_adapter_idr, GFP_KERNEL) == 0) | |
419 | return -ENOMEM; | |
420 | ||
caada32a | 421 | mutex_lock(&core_lock); |
6e13e641 DB |
422 | /* "above" here means "above or equal to", sigh */ |
423 | res = idr_get_new_above(&i2c_adapter_idr, adapter, | |
424 | __i2c_first_dynamic_bus_num, &id); | |
caada32a | 425 | mutex_unlock(&core_lock); |
6e13e641 DB |
426 | |
427 | if (res < 0) { | |
428 | if (res == -EAGAIN) | |
429 | goto retry; | |
430 | return res; | |
431 | } | |
432 | ||
433 | adapter->nr = id; | |
434 | return i2c_register_adapter(adapter); | |
435 | } | |
436 | EXPORT_SYMBOL(i2c_add_adapter); | |
437 | ||
438 | /** | |
439 | * i2c_add_numbered_adapter - declare i2c adapter, use static bus number | |
440 | * @adap: the adapter to register (with adap->nr initialized) | |
d64f73be | 441 | * Context: can sleep |
6e13e641 DB |
442 | * |
443 | * This routine is used to declare an I2C adapter when its bus number | |
444 | * matters. Example: for I2C adapters from system-on-chip CPUs, or | |
445 | * otherwise built in to the system's mainboard, and where i2c_board_info | |
446 | * is used to properly configure I2C devices. | |
447 | * | |
448 | * If no devices have pre-been declared for this bus, then be sure to | |
449 | * register the adapter before any dynamically allocated ones. Otherwise | |
450 | * the required bus ID may not be available. | |
451 | * | |
452 | * When this returns zero, the specified adapter became available for | |
453 | * clients using the bus number provided in adap->nr. Also, the table | |
454 | * of I2C devices pre-declared using i2c_register_board_info() is scanned, | |
455 | * and the appropriate driver model device nodes are created. Otherwise, a | |
456 | * negative errno value is returned. | |
457 | */ | |
458 | int i2c_add_numbered_adapter(struct i2c_adapter *adap) | |
459 | { | |
460 | int id; | |
461 | int status; | |
462 | ||
463 | if (adap->nr & ~MAX_ID_MASK) | |
464 | return -EINVAL; | |
465 | ||
466 | retry: | |
467 | if (idr_pre_get(&i2c_adapter_idr, GFP_KERNEL) == 0) | |
468 | return -ENOMEM; | |
469 | ||
caada32a | 470 | mutex_lock(&core_lock); |
6e13e641 DB |
471 | /* "above" here means "above or equal to", sigh; |
472 | * we need the "equal to" result to force the result | |
473 | */ | |
474 | status = idr_get_new_above(&i2c_adapter_idr, adap, adap->nr, &id); | |
475 | if (status == 0 && id != adap->nr) { | |
476 | status = -EBUSY; | |
477 | idr_remove(&i2c_adapter_idr, id); | |
478 | } | |
caada32a | 479 | mutex_unlock(&core_lock); |
6e13e641 DB |
480 | if (status == -EAGAIN) |
481 | goto retry; | |
482 | ||
483 | if (status == 0) | |
484 | status = i2c_register_adapter(adap); | |
485 | return status; | |
486 | } | |
487 | EXPORT_SYMBOL_GPL(i2c_add_numbered_adapter); | |
488 | ||
026526f5 JD |
489 | static int i2c_do_del_adapter(struct device_driver *d, void *data) |
490 | { | |
491 | struct i2c_driver *driver = to_i2c_driver(d); | |
492 | struct i2c_adapter *adapter = data; | |
493 | int res; | |
494 | ||
495 | if (!driver->detach_adapter) | |
496 | return 0; | |
497 | res = driver->detach_adapter(adapter); | |
498 | if (res) | |
499 | dev_err(&adapter->dev, "detach_adapter failed (%d) " | |
500 | "for driver [%s]\n", res, driver->driver.name); | |
501 | return res; | |
502 | } | |
503 | ||
d64f73be DB |
504 | /** |
505 | * i2c_del_adapter - unregister I2C adapter | |
506 | * @adap: the adapter being unregistered | |
507 | * Context: can sleep | |
508 | * | |
509 | * This unregisters an I2C adapter which was previously registered | |
510 | * by @i2c_add_adapter or @i2c_add_numbered_adapter. | |
511 | */ | |
1da177e4 LT |
512 | int i2c_del_adapter(struct i2c_adapter *adap) |
513 | { | |
514 | struct list_head *item, *_n; | |
1da177e4 LT |
515 | struct i2c_client *client; |
516 | int res = 0; | |
517 | ||
caada32a | 518 | mutex_lock(&core_lock); |
1da177e4 LT |
519 | |
520 | /* First make sure that this adapter was ever added */ | |
87c6c229 | 521 | if (idr_find(&i2c_adapter_idr, adap->nr) != adap) { |
b6d7b3d1 JD |
522 | pr_debug("i2c-core: attempting to delete unregistered " |
523 | "adapter [%s]\n", adap->name); | |
1da177e4 LT |
524 | res = -EINVAL; |
525 | goto out_unlock; | |
526 | } | |
527 | ||
026526f5 JD |
528 | /* Tell drivers about this removal */ |
529 | res = bus_for_each_drv(&i2c_bus_type, NULL, adap, | |
530 | i2c_do_del_adapter); | |
531 | if (res) | |
532 | goto out_unlock; | |
1da177e4 LT |
533 | |
534 | /* detach any active clients. This must be done first, because | |
a551acc2 | 535 | * it can fail; in which case we give up. */ |
1da177e4 | 536 | list_for_each_safe(item, _n, &adap->clients) { |
a1d9e6e4 DB |
537 | struct i2c_driver *driver; |
538 | ||
1da177e4 | 539 | client = list_entry(item, struct i2c_client, list); |
a1d9e6e4 DB |
540 | driver = client->driver; |
541 | ||
542 | /* new style, follow standard driver model */ | |
543 | if (!driver || is_newstyle_driver(driver)) { | |
544 | i2c_unregister_device(client); | |
545 | continue; | |
546 | } | |
1da177e4 | 547 | |
a1d9e6e4 DB |
548 | /* legacy drivers create and remove clients themselves */ |
549 | if ((res = driver->detach_client(client))) { | |
b6d7b3d1 JD |
550 | dev_err(&adap->dev, "detach_client failed for client " |
551 | "[%s] at address 0x%02x\n", client->name, | |
1da177e4 LT |
552 | client->addr); |
553 | goto out_unlock; | |
554 | } | |
555 | } | |
556 | ||
557 | /* clean up the sysfs representation */ | |
558 | init_completion(&adap->dev_released); | |
1da177e4 | 559 | device_unregister(&adap->dev); |
1da177e4 LT |
560 | |
561 | /* wait for sysfs to drop all references */ | |
562 | wait_for_completion(&adap->dev_released); | |
1da177e4 | 563 | |
6e13e641 | 564 | /* free bus id */ |
1da177e4 LT |
565 | idr_remove(&i2c_adapter_idr, adap->nr); |
566 | ||
b6d7b3d1 | 567 | dev_dbg(&adap->dev, "adapter [%s] unregistered\n", adap->name); |
1da177e4 LT |
568 | |
569 | out_unlock: | |
caada32a | 570 | mutex_unlock(&core_lock); |
1da177e4 LT |
571 | return res; |
572 | } | |
c0564606 | 573 | EXPORT_SYMBOL(i2c_del_adapter); |
1da177e4 LT |
574 | |
575 | ||
7b4fbc50 DB |
576 | /* ------------------------------------------------------------------------- */ |
577 | ||
578 | /* | |
579 | * An i2c_driver is used with one or more i2c_client (device) nodes to access | |
580 | * i2c slave chips, on a bus instance associated with some i2c_adapter. There | |
581 | * are two models for binding the driver to its device: "new style" drivers | |
582 | * follow the standard Linux driver model and just respond to probe() calls | |
583 | * issued if the driver core sees they match(); "legacy" drivers create device | |
584 | * nodes themselves. | |
1da177e4 LT |
585 | */ |
586 | ||
de59cf9e | 587 | int i2c_register_driver(struct module *owner, struct i2c_driver *driver) |
1da177e4 | 588 | { |
7eebcb7c | 589 | int res; |
1da177e4 | 590 | |
7b4fbc50 | 591 | /* new style driver methods can't mix with legacy ones */ |
a1d9e6e4 | 592 | if (is_newstyle_driver(driver)) { |
7b4fbc50 DB |
593 | if (driver->attach_adapter || driver->detach_adapter |
594 | || driver->detach_client) { | |
595 | printk(KERN_WARNING | |
596 | "i2c-core: driver [%s] is confused\n", | |
597 | driver->driver.name); | |
598 | return -EINVAL; | |
599 | } | |
600 | } | |
601 | ||
1da177e4 | 602 | /* add the driver to the list of i2c drivers in the driver core */ |
de59cf9e | 603 | driver->driver.owner = owner; |
1da177e4 | 604 | driver->driver.bus = &i2c_bus_type; |
1da177e4 | 605 | |
6e13e641 DB |
606 | /* for new style drivers, when registration returns the driver core |
607 | * will have called probe() for all matching-but-unbound devices. | |
608 | */ | |
1da177e4 LT |
609 | res = driver_register(&driver->driver); |
610 | if (res) | |
7eebcb7c | 611 | return res; |
438d6c2c | 612 | |
caada32a | 613 | mutex_lock(&core_lock); |
7eebcb7c | 614 | |
35d8b2e6 | 615 | pr_debug("i2c-core: driver [%s] registered\n", driver->driver.name); |
1da177e4 | 616 | |
7b4fbc50 | 617 | /* legacy drivers scan i2c busses directly */ |
8a994755 | 618 | if (driver->attach_adapter) { |
4ad4eac6 DB |
619 | struct i2c_adapter *adapter; |
620 | ||
87c6c229 JD |
621 | down(&i2c_adapter_class.sem); |
622 | list_for_each_entry(adapter, &i2c_adapter_class.devices, | |
623 | dev.node) { | |
1da177e4 LT |
624 | driver->attach_adapter(adapter); |
625 | } | |
87c6c229 | 626 | up(&i2c_adapter_class.sem); |
1da177e4 LT |
627 | } |
628 | ||
caada32a | 629 | mutex_unlock(&core_lock); |
7eebcb7c | 630 | return 0; |
1da177e4 | 631 | } |
de59cf9e | 632 | EXPORT_SYMBOL(i2c_register_driver); |
1da177e4 | 633 | |
a1d9e6e4 DB |
634 | /** |
635 | * i2c_del_driver - unregister I2C driver | |
636 | * @driver: the driver being unregistered | |
d64f73be | 637 | * Context: can sleep |
a1d9e6e4 | 638 | */ |
b3e82096 | 639 | void i2c_del_driver(struct i2c_driver *driver) |
1da177e4 | 640 | { |
87c6c229 | 641 | struct list_head *item2, *_n; |
1da177e4 LT |
642 | struct i2c_client *client; |
643 | struct i2c_adapter *adap; | |
438d6c2c | 644 | |
caada32a | 645 | mutex_lock(&core_lock); |
1da177e4 | 646 | |
a1d9e6e4 DB |
647 | /* new-style driver? */ |
648 | if (is_newstyle_driver(driver)) | |
649 | goto unregister; | |
650 | ||
1da177e4 | 651 | /* Have a look at each adapter, if clients of this driver are still |
438d6c2c | 652 | * attached. If so, detach them to be able to kill the driver |
1da177e4 | 653 | * afterwards. |
1da177e4 | 654 | */ |
87c6c229 JD |
655 | down(&i2c_adapter_class.sem); |
656 | list_for_each_entry(adap, &i2c_adapter_class.devices, dev.node) { | |
1da177e4 | 657 | if (driver->detach_adapter) { |
b3e82096 | 658 | if (driver->detach_adapter(adap)) { |
b6d7b3d1 | 659 | dev_err(&adap->dev, "detach_adapter failed " |
35d8b2e6 LR |
660 | "for driver [%s]\n", |
661 | driver->driver.name); | |
1da177e4 LT |
662 | } |
663 | } else { | |
664 | list_for_each_safe(item2, _n, &adap->clients) { | |
665 | client = list_entry(item2, struct i2c_client, list); | |
666 | if (client->driver != driver) | |
667 | continue; | |
b6d7b3d1 JD |
668 | dev_dbg(&adap->dev, "detaching client [%s] " |
669 | "at 0x%02x\n", client->name, | |
670 | client->addr); | |
b3e82096 | 671 | if (driver->detach_client(client)) { |
b6d7b3d1 JD |
672 | dev_err(&adap->dev, "detach_client " |
673 | "failed for client [%s] at " | |
674 | "0x%02x\n", client->name, | |
1da177e4 | 675 | client->addr); |
1da177e4 LT |
676 | } |
677 | } | |
678 | } | |
679 | } | |
87c6c229 | 680 | up(&i2c_adapter_class.sem); |
1da177e4 | 681 | |
a1d9e6e4 | 682 | unregister: |
1da177e4 | 683 | driver_unregister(&driver->driver); |
35d8b2e6 | 684 | pr_debug("i2c-core: driver [%s] unregistered\n", driver->driver.name); |
1da177e4 | 685 | |
caada32a | 686 | mutex_unlock(&core_lock); |
1da177e4 | 687 | } |
c0564606 | 688 | EXPORT_SYMBOL(i2c_del_driver); |
1da177e4 | 689 | |
7b4fbc50 DB |
690 | /* ------------------------------------------------------------------------- */ |
691 | ||
9b766b81 | 692 | static int __i2c_check_addr(struct device *dev, void *addrp) |
1da177e4 | 693 | { |
9b766b81 DB |
694 | struct i2c_client *client = i2c_verify_client(dev); |
695 | int addr = *(int *)addrp; | |
1da177e4 | 696 | |
9b766b81 DB |
697 | if (client && client->addr == addr) |
698 | return -EBUSY; | |
1da177e4 LT |
699 | return 0; |
700 | } | |
701 | ||
5e31c2bd | 702 | static int i2c_check_addr(struct i2c_adapter *adapter, int addr) |
1da177e4 | 703 | { |
9b766b81 | 704 | return device_for_each_child(&adapter->dev, &addr, __i2c_check_addr); |
1da177e4 LT |
705 | } |
706 | ||
707 | int i2c_attach_client(struct i2c_client *client) | |
708 | { | |
709 | struct i2c_adapter *adapter = client->adapter; | |
b119c6c9 | 710 | int res = 0; |
1da177e4 | 711 | |
5c085d36 | 712 | mutex_lock(&adapter->clist_lock); |
9b766b81 | 713 | if (i2c_check_addr(client->adapter, client->addr)) { |
b119c6c9 JD |
714 | res = -EBUSY; |
715 | goto out_unlock; | |
1da177e4 LT |
716 | } |
717 | list_add_tail(&client->list,&adapter->clients); | |
438d6c2c | 718 | |
1da177e4 | 719 | client->dev.parent = &client->adapter->dev; |
1da177e4 | 720 | client->dev.bus = &i2c_bus_type; |
9c1600ed DB |
721 | |
722 | if (client->driver) | |
723 | client->dev.driver = &client->driver->driver; | |
724 | ||
de81d2aa | 725 | if (client->driver && !is_newstyle_driver(client->driver)) { |
9c1600ed | 726 | client->dev.release = i2c_client_release; |
de81d2aa DB |
727 | client->dev.uevent_suppress = 1; |
728 | } else | |
9c1600ed | 729 | client->dev.release = i2c_client_dev_release; |
438d6c2c | 730 | |
1da177e4 LT |
731 | snprintf(&client->dev.bus_id[0], sizeof(client->dev.bus_id), |
732 | "%d-%04x", i2c_adapter_id(adapter), client->addr); | |
b6d7b3d1 JD |
733 | dev_dbg(&adapter->dev, "client [%s] registered with bus id %s\n", |
734 | client->name, client->dev.bus_id); | |
b119c6c9 JD |
735 | res = device_register(&client->dev); |
736 | if (res) | |
737 | goto out_list; | |
b119c6c9 | 738 | mutex_unlock(&adapter->clist_lock); |
77ed74da JD |
739 | |
740 | if (adapter->client_register) { | |
741 | if (adapter->client_register(client)) { | |
742 | dev_dbg(&adapter->dev, "client_register " | |
743 | "failed for client [%s] at 0x%02x\n", | |
744 | client->name, client->addr); | |
745 | } | |
746 | } | |
747 | ||
748 | return 0; | |
b119c6c9 | 749 | |
b119c6c9 JD |
750 | out_list: |
751 | list_del(&client->list); | |
752 | dev_err(&adapter->dev, "Failed to attach i2c client %s at 0x%02x " | |
753 | "(%d)\n", client->name, client->addr, res); | |
77ed74da JD |
754 | out_unlock: |
755 | mutex_unlock(&adapter->clist_lock); | |
756 | return res; | |
1da177e4 | 757 | } |
c0564606 | 758 | EXPORT_SYMBOL(i2c_attach_client); |
1da177e4 LT |
759 | |
760 | int i2c_detach_client(struct i2c_client *client) | |
761 | { | |
762 | struct i2c_adapter *adapter = client->adapter; | |
763 | int res = 0; | |
438d6c2c | 764 | |
1da177e4 LT |
765 | if (adapter->client_unregister) { |
766 | res = adapter->client_unregister(client); | |
767 | if (res) { | |
768 | dev_err(&client->dev, | |
86749e85 JD |
769 | "client_unregister [%s] failed, " |
770 | "client not detached\n", client->name); | |
1da177e4 LT |
771 | goto out; |
772 | } | |
773 | } | |
774 | ||
5c085d36 | 775 | mutex_lock(&adapter->clist_lock); |
1da177e4 LT |
776 | list_del(&client->list); |
777 | init_completion(&client->released); | |
1da177e4 | 778 | device_unregister(&client->dev); |
5c085d36 | 779 | mutex_unlock(&adapter->clist_lock); |
1da177e4 LT |
780 | wait_for_completion(&client->released); |
781 | ||
782 | out: | |
783 | return res; | |
784 | } | |
c0564606 | 785 | EXPORT_SYMBOL(i2c_detach_client); |
1da177e4 | 786 | |
e48d3319 JD |
787 | /** |
788 | * i2c_use_client - increments the reference count of the i2c client structure | |
789 | * @client: the client being referenced | |
790 | * | |
791 | * Each live reference to a client should be refcounted. The driver model does | |
792 | * that automatically as part of driver binding, so that most drivers don't | |
793 | * need to do this explicitly: they hold a reference until they're unbound | |
794 | * from the device. | |
795 | * | |
796 | * A pointer to the client with the incremented reference counter is returned. | |
797 | */ | |
798 | struct i2c_client *i2c_use_client(struct i2c_client *client) | |
1da177e4 | 799 | { |
bdc511f4 | 800 | get_device(&client->dev); |
e48d3319 | 801 | return client; |
1da177e4 | 802 | } |
c0564606 | 803 | EXPORT_SYMBOL(i2c_use_client); |
1da177e4 | 804 | |
e48d3319 JD |
805 | /** |
806 | * i2c_release_client - release a use of the i2c client structure | |
807 | * @client: the client being no longer referenced | |
808 | * | |
809 | * Must be called when a user of a client is finished with it. | |
810 | */ | |
811 | void i2c_release_client(struct i2c_client *client) | |
1da177e4 | 812 | { |
bdc511f4 | 813 | put_device(&client->dev); |
1da177e4 | 814 | } |
c0564606 | 815 | EXPORT_SYMBOL(i2c_release_client); |
1da177e4 | 816 | |
9b766b81 DB |
817 | struct i2c_cmd_arg { |
818 | unsigned cmd; | |
819 | void *arg; | |
820 | }; | |
821 | ||
822 | static int i2c_cmd(struct device *dev, void *_arg) | |
823 | { | |
824 | struct i2c_client *client = i2c_verify_client(dev); | |
825 | struct i2c_cmd_arg *arg = _arg; | |
826 | ||
827 | if (client && client->driver && client->driver->command) | |
828 | client->driver->command(client, arg->cmd, arg->arg); | |
829 | return 0; | |
830 | } | |
831 | ||
1da177e4 LT |
832 | void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg) |
833 | { | |
9b766b81 | 834 | struct i2c_cmd_arg cmd_arg; |
1da177e4 | 835 | |
9b766b81 DB |
836 | cmd_arg.cmd = cmd; |
837 | cmd_arg.arg = arg; | |
838 | device_for_each_child(&adap->dev, &cmd_arg, i2c_cmd); | |
1da177e4 | 839 | } |
c0564606 | 840 | EXPORT_SYMBOL(i2c_clients_command); |
1da177e4 LT |
841 | |
842 | static int __init i2c_init(void) | |
843 | { | |
844 | int retval; | |
845 | ||
846 | retval = bus_register(&i2c_bus_type); | |
1da177e4 LT |
847 | if (retval) |
848 | return retval; | |
849 | return class_register(&i2c_adapter_class); | |
850 | } | |
851 | ||
852 | static void __exit i2c_exit(void) | |
853 | { | |
854 | class_unregister(&i2c_adapter_class); | |
1da177e4 LT |
855 | bus_unregister(&i2c_bus_type); |
856 | } | |
857 | ||
858 | subsys_initcall(i2c_init); | |
859 | module_exit(i2c_exit); | |
860 | ||
861 | /* ---------------------------------------------------- | |
862 | * the functional interface to the i2c busses. | |
863 | * ---------------------------------------------------- | |
864 | */ | |
865 | ||
866 | int i2c_transfer(struct i2c_adapter * adap, struct i2c_msg *msgs, int num) | |
867 | { | |
868 | int ret; | |
869 | ||
870 | if (adap->algo->master_xfer) { | |
871 | #ifdef DEBUG | |
872 | for (ret = 0; ret < num; ret++) { | |
873 | dev_dbg(&adap->dev, "master_xfer[%d] %c, addr=0x%02x, " | |
209d27c3 JD |
874 | "len=%d%s\n", ret, (msgs[ret].flags & I2C_M_RD) |
875 | ? 'R' : 'W', msgs[ret].addr, msgs[ret].len, | |
876 | (msgs[ret].flags & I2C_M_RECV_LEN) ? "+" : ""); | |
1da177e4 LT |
877 | } |
878 | #endif | |
879 | ||
cea443a8 MR |
880 | if (in_atomic() || irqs_disabled()) { |
881 | ret = mutex_trylock(&adap->bus_lock); | |
882 | if (!ret) | |
883 | /* I2C activity is ongoing. */ | |
884 | return -EAGAIN; | |
885 | } else { | |
886 | mutex_lock_nested(&adap->bus_lock, adap->level); | |
887 | } | |
888 | ||
1da177e4 | 889 | ret = adap->algo->master_xfer(adap,msgs,num); |
5c085d36 | 890 | mutex_unlock(&adap->bus_lock); |
1da177e4 LT |
891 | |
892 | return ret; | |
893 | } else { | |
894 | dev_dbg(&adap->dev, "I2C level transfers not supported\n"); | |
895 | return -ENOSYS; | |
896 | } | |
897 | } | |
c0564606 | 898 | EXPORT_SYMBOL(i2c_transfer); |
1da177e4 LT |
899 | |
900 | int i2c_master_send(struct i2c_client *client,const char *buf ,int count) | |
901 | { | |
902 | int ret; | |
903 | struct i2c_adapter *adap=client->adapter; | |
904 | struct i2c_msg msg; | |
905 | ||
815f55f2 JD |
906 | msg.addr = client->addr; |
907 | msg.flags = client->flags & I2C_M_TEN; | |
908 | msg.len = count; | |
909 | msg.buf = (char *)buf; | |
438d6c2c | 910 | |
815f55f2 | 911 | ret = i2c_transfer(adap, &msg, 1); |
1da177e4 | 912 | |
815f55f2 JD |
913 | /* If everything went ok (i.e. 1 msg transmitted), return #bytes |
914 | transmitted, else error code. */ | |
915 | return (ret == 1) ? count : ret; | |
1da177e4 | 916 | } |
c0564606 | 917 | EXPORT_SYMBOL(i2c_master_send); |
1da177e4 LT |
918 | |
919 | int i2c_master_recv(struct i2c_client *client, char *buf ,int count) | |
920 | { | |
921 | struct i2c_adapter *adap=client->adapter; | |
922 | struct i2c_msg msg; | |
923 | int ret; | |
815f55f2 JD |
924 | |
925 | msg.addr = client->addr; | |
926 | msg.flags = client->flags & I2C_M_TEN; | |
927 | msg.flags |= I2C_M_RD; | |
928 | msg.len = count; | |
929 | msg.buf = buf; | |
930 | ||
931 | ret = i2c_transfer(adap, &msg, 1); | |
932 | ||
933 | /* If everything went ok (i.e. 1 msg transmitted), return #bytes | |
934 | transmitted, else error code. */ | |
935 | return (ret == 1) ? count : ret; | |
1da177e4 | 936 | } |
c0564606 | 937 | EXPORT_SYMBOL(i2c_master_recv); |
1da177e4 | 938 | |
1da177e4 LT |
939 | /* ---------------------------------------------------- |
940 | * the i2c address scanning function | |
941 | * Will not work for 10-bit addresses! | |
942 | * ---------------------------------------------------- | |
943 | */ | |
a89ba0bc JD |
944 | static int i2c_probe_address(struct i2c_adapter *adapter, int addr, int kind, |
945 | int (*found_proc) (struct i2c_adapter *, int, int)) | |
946 | { | |
947 | int err; | |
948 | ||
949 | /* Make sure the address is valid */ | |
950 | if (addr < 0x03 || addr > 0x77) { | |
951 | dev_warn(&adapter->dev, "Invalid probe address 0x%02x\n", | |
952 | addr); | |
953 | return -EINVAL; | |
9fc6adfa JD |
954 | } |
955 | ||
a89ba0bc JD |
956 | /* Skip if already in use */ |
957 | if (i2c_check_addr(adapter, addr)) | |
958 | return 0; | |
959 | ||
960 | /* Make sure there is something at this address, unless forced */ | |
4c9337da JD |
961 | if (kind < 0) { |
962 | if (i2c_smbus_xfer(adapter, addr, 0, 0, 0, | |
963 | I2C_SMBUS_QUICK, NULL) < 0) | |
964 | return 0; | |
965 | ||
966 | /* prevent 24RF08 corruption */ | |
967 | if ((addr & ~0x0f) == 0x50) | |
968 | i2c_smbus_xfer(adapter, addr, 0, 0, 0, | |
969 | I2C_SMBUS_QUICK, NULL); | |
970 | } | |
a89ba0bc JD |
971 | |
972 | /* Finally call the custom detection function */ | |
973 | err = found_proc(adapter, addr, kind); | |
a89ba0bc JD |
974 | /* -ENODEV can be returned if there is a chip at the given address |
975 | but it isn't supported by this chip driver. We catch it here as | |
976 | this isn't an error. */ | |
114fd183 JD |
977 | if (err == -ENODEV) |
978 | err = 0; | |
979 | ||
980 | if (err) | |
981 | dev_warn(&adapter->dev, "Client creation failed at 0x%x (%d)\n", | |
982 | addr, err); | |
983 | return err; | |
9fc6adfa JD |
984 | } |
985 | ||
1da177e4 | 986 | int i2c_probe(struct i2c_adapter *adapter, |
bfb6df24 | 987 | const struct i2c_client_address_data *address_data, |
1da177e4 LT |
988 | int (*found_proc) (struct i2c_adapter *, int, int)) |
989 | { | |
a89ba0bc | 990 | int i, err; |
1da177e4 LT |
991 | int adap_id = i2c_adapter_id(adapter); |
992 | ||
a89ba0bc JD |
993 | /* Force entries are done first, and are not affected by ignore |
994 | entries */ | |
995 | if (address_data->forces) { | |
bfb6df24 | 996 | const unsigned short * const *forces = address_data->forces; |
a89ba0bc JD |
997 | int kind; |
998 | ||
999 | for (kind = 0; forces[kind]; kind++) { | |
1000 | for (i = 0; forces[kind][i] != I2C_CLIENT_END; | |
1001 | i += 2) { | |
1002 | if (forces[kind][i] == adap_id | |
1003 | || forces[kind][i] == ANY_I2C_BUS) { | |
1004 | dev_dbg(&adapter->dev, "found force " | |
1005 | "parameter for adapter %d, " | |
1006 | "addr 0x%02x, kind %d\n", | |
1007 | adap_id, forces[kind][i + 1], | |
1008 | kind); | |
1009 | err = i2c_probe_address(adapter, | |
1010 | forces[kind][i + 1], | |
1011 | kind, found_proc); | |
1012 | if (err) | |
1013 | return err; | |
1014 | } | |
1da177e4 LT |
1015 | } |
1016 | } | |
a89ba0bc | 1017 | } |
1da177e4 | 1018 | |
4366dc94 JD |
1019 | /* Stop here if we can't use SMBUS_QUICK */ |
1020 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_QUICK)) { | |
1021 | if (address_data->probe[0] == I2C_CLIENT_END | |
1022 | && address_data->normal_i2c[0] == I2C_CLIENT_END) | |
438d6c2c | 1023 | return 0; |
4366dc94 JD |
1024 | |
1025 | dev_warn(&adapter->dev, "SMBus Quick command not supported, " | |
1026 | "can't probe for chips\n"); | |
1027 | return -1; | |
1028 | } | |
1029 | ||
a89ba0bc JD |
1030 | /* Probe entries are done second, and are not affected by ignore |
1031 | entries either */ | |
1032 | for (i = 0; address_data->probe[i] != I2C_CLIENT_END; i += 2) { | |
1033 | if (address_data->probe[i] == adap_id | |
1034 | || address_data->probe[i] == ANY_I2C_BUS) { | |
1035 | dev_dbg(&adapter->dev, "found probe parameter for " | |
1036 | "adapter %d, addr 0x%02x\n", adap_id, | |
1037 | address_data->probe[i + 1]); | |
1038 | err = i2c_probe_address(adapter, | |
1039 | address_data->probe[i + 1], | |
1040 | -1, found_proc); | |
1041 | if (err) | |
1042 | return err; | |
1da177e4 | 1043 | } |
a89ba0bc | 1044 | } |
1da177e4 | 1045 | |
a89ba0bc JD |
1046 | /* Normal entries are done last, unless shadowed by an ignore entry */ |
1047 | for (i = 0; address_data->normal_i2c[i] != I2C_CLIENT_END; i += 1) { | |
1048 | int j, ignore; | |
1049 | ||
1050 | ignore = 0; | |
1051 | for (j = 0; address_data->ignore[j] != I2C_CLIENT_END; | |
1052 | j += 2) { | |
1053 | if ((address_data->ignore[j] == adap_id || | |
1054 | address_data->ignore[j] == ANY_I2C_BUS) | |
1055 | && address_data->ignore[j + 1] | |
1056 | == address_data->normal_i2c[i]) { | |
1057 | dev_dbg(&adapter->dev, "found ignore " | |
1058 | "parameter for adapter %d, " | |
1059 | "addr 0x%02x\n", adap_id, | |
1060 | address_data->ignore[j + 1]); | |
2369df93 MH |
1061 | ignore = 1; |
1062 | break; | |
1da177e4 LT |
1063 | } |
1064 | } | |
a89ba0bc | 1065 | if (ignore) |
1da177e4 LT |
1066 | continue; |
1067 | ||
a89ba0bc JD |
1068 | dev_dbg(&adapter->dev, "found normal entry for adapter %d, " |
1069 | "addr 0x%02x\n", adap_id, | |
1070 | address_data->normal_i2c[i]); | |
1071 | err = i2c_probe_address(adapter, address_data->normal_i2c[i], | |
1072 | -1, found_proc); | |
1073 | if (err) | |
1074 | return err; | |
1da177e4 | 1075 | } |
a89ba0bc | 1076 | |
1da177e4 LT |
1077 | return 0; |
1078 | } | |
c0564606 | 1079 | EXPORT_SYMBOL(i2c_probe); |
1da177e4 | 1080 | |
12b5053a JD |
1081 | struct i2c_client * |
1082 | i2c_new_probed_device(struct i2c_adapter *adap, | |
1083 | struct i2c_board_info *info, | |
1084 | unsigned short const *addr_list) | |
1085 | { | |
1086 | int i; | |
1087 | ||
1088 | /* Stop here if the bus doesn't support probing */ | |
1089 | if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_READ_BYTE)) { | |
1090 | dev_err(&adap->dev, "Probing not supported\n"); | |
1091 | return NULL; | |
1092 | } | |
1093 | ||
1094 | mutex_lock(&adap->clist_lock); | |
1095 | for (i = 0; addr_list[i] != I2C_CLIENT_END; i++) { | |
1096 | /* Check address validity */ | |
1097 | if (addr_list[i] < 0x03 || addr_list[i] > 0x77) { | |
1098 | dev_warn(&adap->dev, "Invalid 7-bit address " | |
1099 | "0x%02x\n", addr_list[i]); | |
1100 | continue; | |
1101 | } | |
1102 | ||
1103 | /* Check address availability */ | |
9b766b81 | 1104 | if (i2c_check_addr(adap, addr_list[i])) { |
12b5053a JD |
1105 | dev_dbg(&adap->dev, "Address 0x%02x already in " |
1106 | "use, not probing\n", addr_list[i]); | |
1107 | continue; | |
1108 | } | |
1109 | ||
1110 | /* Test address responsiveness | |
1111 | The default probe method is a quick write, but it is known | |
1112 | to corrupt the 24RF08 EEPROMs due to a state machine bug, | |
1113 | and could also irreversibly write-protect some EEPROMs, so | |
1114 | for address ranges 0x30-0x37 and 0x50-0x5f, we use a byte | |
1115 | read instead. Also, some bus drivers don't implement | |
1116 | quick write, so we fallback to a byte read it that case | |
1117 | too. */ | |
1118 | if ((addr_list[i] & ~0x07) == 0x30 | |
1119 | || (addr_list[i] & ~0x0f) == 0x50 | |
1120 | || !i2c_check_functionality(adap, I2C_FUNC_SMBUS_QUICK)) { | |
1121 | if (i2c_smbus_xfer(adap, addr_list[i], 0, | |
1122 | I2C_SMBUS_READ, 0, | |
1123 | I2C_SMBUS_BYTE, NULL) >= 0) | |
1124 | break; | |
1125 | } else { | |
1126 | if (i2c_smbus_xfer(adap, addr_list[i], 0, | |
1127 | I2C_SMBUS_WRITE, 0, | |
1128 | I2C_SMBUS_QUICK, NULL) >= 0) | |
1129 | break; | |
1130 | } | |
1131 | } | |
1132 | mutex_unlock(&adap->clist_lock); | |
1133 | ||
1134 | if (addr_list[i] == I2C_CLIENT_END) { | |
1135 | dev_dbg(&adap->dev, "Probing failed, no device found\n"); | |
1136 | return NULL; | |
1137 | } | |
1138 | ||
1139 | info->addr = addr_list[i]; | |
1140 | return i2c_new_device(adap, info); | |
1141 | } | |
1142 | EXPORT_SYMBOL_GPL(i2c_new_probed_device); | |
1143 | ||
1da177e4 LT |
1144 | struct i2c_adapter* i2c_get_adapter(int id) |
1145 | { | |
1da177e4 | 1146 | struct i2c_adapter *adapter; |
438d6c2c | 1147 | |
caada32a | 1148 | mutex_lock(&core_lock); |
a0920e10 MH |
1149 | adapter = (struct i2c_adapter *)idr_find(&i2c_adapter_idr, id); |
1150 | if (adapter && !try_module_get(adapter->owner)) | |
1151 | adapter = NULL; | |
1152 | ||
caada32a | 1153 | mutex_unlock(&core_lock); |
a0920e10 | 1154 | return adapter; |
1da177e4 | 1155 | } |
c0564606 | 1156 | EXPORT_SYMBOL(i2c_get_adapter); |
1da177e4 LT |
1157 | |
1158 | void i2c_put_adapter(struct i2c_adapter *adap) | |
1159 | { | |
1160 | module_put(adap->owner); | |
1161 | } | |
c0564606 | 1162 | EXPORT_SYMBOL(i2c_put_adapter); |
1da177e4 LT |
1163 | |
1164 | /* The SMBus parts */ | |
1165 | ||
438d6c2c | 1166 | #define POLY (0x1070U << 3) |
1da177e4 LT |
1167 | static u8 |
1168 | crc8(u16 data) | |
1169 | { | |
1170 | int i; | |
438d6c2c | 1171 | |
1da177e4 | 1172 | for(i = 0; i < 8; i++) { |
438d6c2c | 1173 | if (data & 0x8000) |
1da177e4 LT |
1174 | data = data ^ POLY; |
1175 | data = data << 1; | |
1176 | } | |
1177 | return (u8)(data >> 8); | |
1178 | } | |
1179 | ||
421ef47b JD |
1180 | /* Incremental CRC8 over count bytes in the array pointed to by p */ |
1181 | static u8 i2c_smbus_pec(u8 crc, u8 *p, size_t count) | |
1da177e4 LT |
1182 | { |
1183 | int i; | |
1184 | ||
1185 | for(i = 0; i < count; i++) | |
421ef47b | 1186 | crc = crc8((crc ^ p[i]) << 8); |
1da177e4 LT |
1187 | return crc; |
1188 | } | |
1189 | ||
421ef47b JD |
1190 | /* Assume a 7-bit address, which is reasonable for SMBus */ |
1191 | static u8 i2c_smbus_msg_pec(u8 pec, struct i2c_msg *msg) | |
1da177e4 | 1192 | { |
421ef47b JD |
1193 | /* The address will be sent first */ |
1194 | u8 addr = (msg->addr << 1) | !!(msg->flags & I2C_M_RD); | |
1195 | pec = i2c_smbus_pec(pec, &addr, 1); | |
1196 | ||
1197 | /* The data buffer follows */ | |
1198 | return i2c_smbus_pec(pec, msg->buf, msg->len); | |
1da177e4 LT |
1199 | } |
1200 | ||
421ef47b JD |
1201 | /* Used for write only transactions */ |
1202 | static inline void i2c_smbus_add_pec(struct i2c_msg *msg) | |
1da177e4 | 1203 | { |
421ef47b JD |
1204 | msg->buf[msg->len] = i2c_smbus_msg_pec(0, msg); |
1205 | msg->len++; | |
1da177e4 LT |
1206 | } |
1207 | ||
421ef47b JD |
1208 | /* Return <0 on CRC error |
1209 | If there was a write before this read (most cases) we need to take the | |
1210 | partial CRC from the write part into account. | |
1211 | Note that this function does modify the message (we need to decrease the | |
1212 | message length to hide the CRC byte from the caller). */ | |
1213 | static int i2c_smbus_check_pec(u8 cpec, struct i2c_msg *msg) | |
1da177e4 | 1214 | { |
421ef47b JD |
1215 | u8 rpec = msg->buf[--msg->len]; |
1216 | cpec = i2c_smbus_msg_pec(cpec, msg); | |
1da177e4 | 1217 | |
1da177e4 LT |
1218 | if (rpec != cpec) { |
1219 | pr_debug("i2c-core: Bad PEC 0x%02x vs. 0x%02x\n", | |
1220 | rpec, cpec); | |
1221 | return -1; | |
1222 | } | |
438d6c2c | 1223 | return 0; |
1da177e4 LT |
1224 | } |
1225 | ||
1226 | s32 i2c_smbus_write_quick(struct i2c_client *client, u8 value) | |
1227 | { | |
1228 | return i2c_smbus_xfer(client->adapter,client->addr,client->flags, | |
438d6c2c | 1229 | value,0,I2C_SMBUS_QUICK,NULL); |
1da177e4 | 1230 | } |
c0564606 | 1231 | EXPORT_SYMBOL(i2c_smbus_write_quick); |
1da177e4 LT |
1232 | |
1233 | s32 i2c_smbus_read_byte(struct i2c_client *client) | |
1234 | { | |
1235 | union i2c_smbus_data data; | |
1236 | if (i2c_smbus_xfer(client->adapter,client->addr,client->flags, | |
1237 | I2C_SMBUS_READ,0,I2C_SMBUS_BYTE, &data)) | |
1238 | return -1; | |
1239 | else | |
7eff82c8 | 1240 | return data.byte; |
1da177e4 | 1241 | } |
c0564606 | 1242 | EXPORT_SYMBOL(i2c_smbus_read_byte); |
1da177e4 LT |
1243 | |
1244 | s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value) | |
1245 | { | |
1da177e4 | 1246 | return i2c_smbus_xfer(client->adapter,client->addr,client->flags, |
421ef47b | 1247 | I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); |
1da177e4 | 1248 | } |
c0564606 | 1249 | EXPORT_SYMBOL(i2c_smbus_write_byte); |
1da177e4 LT |
1250 | |
1251 | s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command) | |
1252 | { | |
1253 | union i2c_smbus_data data; | |
1254 | if (i2c_smbus_xfer(client->adapter,client->addr,client->flags, | |
1255 | I2C_SMBUS_READ,command, I2C_SMBUS_BYTE_DATA,&data)) | |
1256 | return -1; | |
1257 | else | |
7eff82c8 | 1258 | return data.byte; |
1da177e4 | 1259 | } |
c0564606 | 1260 | EXPORT_SYMBOL(i2c_smbus_read_byte_data); |
1da177e4 LT |
1261 | |
1262 | s32 i2c_smbus_write_byte_data(struct i2c_client *client, u8 command, u8 value) | |
1263 | { | |
1264 | union i2c_smbus_data data; | |
1265 | data.byte = value; | |
1266 | return i2c_smbus_xfer(client->adapter,client->addr,client->flags, | |
1267 | I2C_SMBUS_WRITE,command, | |
1268 | I2C_SMBUS_BYTE_DATA,&data); | |
1269 | } | |
c0564606 | 1270 | EXPORT_SYMBOL(i2c_smbus_write_byte_data); |
1da177e4 LT |
1271 | |
1272 | s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command) | |
1273 | { | |
1274 | union i2c_smbus_data data; | |
1275 | if (i2c_smbus_xfer(client->adapter,client->addr,client->flags, | |
1276 | I2C_SMBUS_READ,command, I2C_SMBUS_WORD_DATA, &data)) | |
1277 | return -1; | |
1278 | else | |
7eff82c8 | 1279 | return data.word; |
1da177e4 | 1280 | } |
c0564606 | 1281 | EXPORT_SYMBOL(i2c_smbus_read_word_data); |
1da177e4 LT |
1282 | |
1283 | s32 i2c_smbus_write_word_data(struct i2c_client *client, u8 command, u16 value) | |
1284 | { | |
1285 | union i2c_smbus_data data; | |
1286 | data.word = value; | |
1287 | return i2c_smbus_xfer(client->adapter,client->addr,client->flags, | |
1288 | I2C_SMBUS_WRITE,command, | |
1289 | I2C_SMBUS_WORD_DATA,&data); | |
1290 | } | |
c0564606 | 1291 | EXPORT_SYMBOL(i2c_smbus_write_word_data); |
1da177e4 | 1292 | |
a64ec07d DB |
1293 | /** |
1294 | * i2c_smbus_read_block_data - SMBus block read request | |
1295 | * @client: Handle to slave device | |
1296 | * @command: Command byte issued to let the slave know what data should | |
1297 | * be returned | |
1298 | * @values: Byte array into which data will be read; big enough to hold | |
1299 | * the data returned by the slave. SMBus allows at most 32 bytes. | |
1300 | * | |
1301 | * Returns the number of bytes read in the slave's response, else a | |
1302 | * negative number to indicate some kind of error. | |
1303 | * | |
1304 | * Note that using this function requires that the client's adapter support | |
1305 | * the I2C_FUNC_SMBUS_READ_BLOCK_DATA functionality. Not all adapter drivers | |
1306 | * support this; its emulation through I2C messaging relies on a specific | |
1307 | * mechanism (I2C_M_RECV_LEN) which may not be implemented. | |
1308 | */ | |
b86a1bc8 JD |
1309 | s32 i2c_smbus_read_block_data(struct i2c_client *client, u8 command, |
1310 | u8 *values) | |
1311 | { | |
1312 | union i2c_smbus_data data; | |
1313 | ||
1314 | if (i2c_smbus_xfer(client->adapter, client->addr, client->flags, | |
1315 | I2C_SMBUS_READ, command, | |
1316 | I2C_SMBUS_BLOCK_DATA, &data)) | |
1317 | return -1; | |
1318 | ||
1319 | memcpy(values, &data.block[1], data.block[0]); | |
1320 | return data.block[0]; | |
1321 | } | |
1322 | EXPORT_SYMBOL(i2c_smbus_read_block_data); | |
1323 | ||
1da177e4 | 1324 | s32 i2c_smbus_write_block_data(struct i2c_client *client, u8 command, |
46f5ed75 | 1325 | u8 length, const u8 *values) |
1da177e4 LT |
1326 | { |
1327 | union i2c_smbus_data data; | |
7656032b | 1328 | |
1da177e4 LT |
1329 | if (length > I2C_SMBUS_BLOCK_MAX) |
1330 | length = I2C_SMBUS_BLOCK_MAX; | |
1da177e4 | 1331 | data.block[0] = length; |
7656032b | 1332 | memcpy(&data.block[1], values, length); |
1da177e4 LT |
1333 | return i2c_smbus_xfer(client->adapter,client->addr,client->flags, |
1334 | I2C_SMBUS_WRITE,command, | |
1335 | I2C_SMBUS_BLOCK_DATA,&data); | |
1336 | } | |
c0564606 | 1337 | EXPORT_SYMBOL(i2c_smbus_write_block_data); |
1da177e4 LT |
1338 | |
1339 | /* Returns the number of read bytes */ | |
4b2643d7 JD |
1340 | s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client, u8 command, |
1341 | u8 length, u8 *values) | |
1da177e4 LT |
1342 | { |
1343 | union i2c_smbus_data data; | |
7656032b | 1344 | |
4b2643d7 JD |
1345 | if (length > I2C_SMBUS_BLOCK_MAX) |
1346 | length = I2C_SMBUS_BLOCK_MAX; | |
1347 | data.block[0] = length; | |
1da177e4 LT |
1348 | if (i2c_smbus_xfer(client->adapter,client->addr,client->flags, |
1349 | I2C_SMBUS_READ,command, | |
1350 | I2C_SMBUS_I2C_BLOCK_DATA,&data)) | |
1351 | return -1; | |
7656032b JD |
1352 | |
1353 | memcpy(values, &data.block[1], data.block[0]); | |
1354 | return data.block[0]; | |
1da177e4 | 1355 | } |
c0564606 | 1356 | EXPORT_SYMBOL(i2c_smbus_read_i2c_block_data); |
1da177e4 | 1357 | |
21bbd691 | 1358 | s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client, u8 command, |
46f5ed75 | 1359 | u8 length, const u8 *values) |
21bbd691 JD |
1360 | { |
1361 | union i2c_smbus_data data; | |
1362 | ||
1363 | if (length > I2C_SMBUS_BLOCK_MAX) | |
1364 | length = I2C_SMBUS_BLOCK_MAX; | |
1365 | data.block[0] = length; | |
1366 | memcpy(data.block + 1, values, length); | |
1367 | return i2c_smbus_xfer(client->adapter, client->addr, client->flags, | |
1368 | I2C_SMBUS_WRITE, command, | |
1369 | I2C_SMBUS_I2C_BLOCK_DATA, &data); | |
1370 | } | |
c0564606 | 1371 | EXPORT_SYMBOL(i2c_smbus_write_i2c_block_data); |
21bbd691 | 1372 | |
438d6c2c | 1373 | /* Simulate a SMBus command using the i2c protocol |
1da177e4 | 1374 | No checking of parameters is done! */ |
438d6c2c | 1375 | static s32 i2c_smbus_xfer_emulated(struct i2c_adapter * adapter, u16 addr, |
1da177e4 | 1376 | unsigned short flags, |
438d6c2c | 1377 | char read_write, u8 command, int size, |
1da177e4 LT |
1378 | union i2c_smbus_data * data) |
1379 | { | |
1380 | /* So we need to generate a series of msgs. In the case of writing, we | |
1381 | need to use only one message; when reading, we need two. We initialize | |
1382 | most things with sane defaults, to keep the code below somewhat | |
1383 | simpler. */ | |
5c50d188 HI |
1384 | unsigned char msgbuf0[I2C_SMBUS_BLOCK_MAX+3]; |
1385 | unsigned char msgbuf1[I2C_SMBUS_BLOCK_MAX+2]; | |
1da177e4 | 1386 | int num = read_write == I2C_SMBUS_READ?2:1; |
438d6c2c | 1387 | struct i2c_msg msg[2] = { { addr, flags, 1, msgbuf0 }, |
1da177e4 LT |
1388 | { addr, flags | I2C_M_RD, 0, msgbuf1 } |
1389 | }; | |
1390 | int i; | |
421ef47b | 1391 | u8 partial_pec = 0; |
1da177e4 LT |
1392 | |
1393 | msgbuf0[0] = command; | |
1394 | switch(size) { | |
1395 | case I2C_SMBUS_QUICK: | |
1396 | msg[0].len = 0; | |
1397 | /* Special case: The read/write field is used as data */ | |
1398 | msg[0].flags = flags | (read_write==I2C_SMBUS_READ)?I2C_M_RD:0; | |
1399 | num = 1; | |
1400 | break; | |
1401 | case I2C_SMBUS_BYTE: | |
1402 | if (read_write == I2C_SMBUS_READ) { | |
1403 | /* Special case: only a read! */ | |
1404 | msg[0].flags = I2C_M_RD | flags; | |
1405 | num = 1; | |
1406 | } | |
1407 | break; | |
1408 | case I2C_SMBUS_BYTE_DATA: | |
1409 | if (read_write == I2C_SMBUS_READ) | |
1410 | msg[1].len = 1; | |
1411 | else { | |
1412 | msg[0].len = 2; | |
1413 | msgbuf0[1] = data->byte; | |
1414 | } | |
1415 | break; | |
1416 | case I2C_SMBUS_WORD_DATA: | |
1417 | if (read_write == I2C_SMBUS_READ) | |
1418 | msg[1].len = 2; | |
1419 | else { | |
1420 | msg[0].len=3; | |
1421 | msgbuf0[1] = data->word & 0xff; | |
7eff82c8 | 1422 | msgbuf0[2] = data->word >> 8; |
1da177e4 LT |
1423 | } |
1424 | break; | |
1425 | case I2C_SMBUS_PROC_CALL: | |
1426 | num = 2; /* Special case */ | |
1427 | read_write = I2C_SMBUS_READ; | |
1428 | msg[0].len = 3; | |
1429 | msg[1].len = 2; | |
1430 | msgbuf0[1] = data->word & 0xff; | |
7eff82c8 | 1431 | msgbuf0[2] = data->word >> 8; |
1da177e4 LT |
1432 | break; |
1433 | case I2C_SMBUS_BLOCK_DATA: | |
1da177e4 | 1434 | if (read_write == I2C_SMBUS_READ) { |
209d27c3 JD |
1435 | msg[1].flags |= I2C_M_RECV_LEN; |
1436 | msg[1].len = 1; /* block length will be added by | |
1437 | the underlying bus driver */ | |
1da177e4 LT |
1438 | } else { |
1439 | msg[0].len = data->block[0] + 2; | |
1440 | if (msg[0].len > I2C_SMBUS_BLOCK_MAX + 2) { | |
1441 | dev_err(&adapter->dev, "smbus_access called with " | |
1442 | "invalid block write size (%d)\n", | |
1443 | data->block[0]); | |
1444 | return -1; | |
1445 | } | |
5c50d188 | 1446 | for (i = 1; i < msg[0].len; i++) |
1da177e4 LT |
1447 | msgbuf0[i] = data->block[i-1]; |
1448 | } | |
1449 | break; | |
1450 | case I2C_SMBUS_BLOCK_PROC_CALL: | |
209d27c3 JD |
1451 | num = 2; /* Another special case */ |
1452 | read_write = I2C_SMBUS_READ; | |
1453 | if (data->block[0] > I2C_SMBUS_BLOCK_MAX) { | |
1454 | dev_err(&adapter->dev, "%s called with invalid " | |
1455 | "block proc call size (%d)\n", __FUNCTION__, | |
1456 | data->block[0]); | |
1457 | return -1; | |
1458 | } | |
1459 | msg[0].len = data->block[0] + 2; | |
1460 | for (i = 1; i < msg[0].len; i++) | |
1461 | msgbuf0[i] = data->block[i-1]; | |
1462 | msg[1].flags |= I2C_M_RECV_LEN; | |
1463 | msg[1].len = 1; /* block length will be added by | |
1464 | the underlying bus driver */ | |
1465 | break; | |
1da177e4 LT |
1466 | case I2C_SMBUS_I2C_BLOCK_DATA: |
1467 | if (read_write == I2C_SMBUS_READ) { | |
4b2643d7 | 1468 | msg[1].len = data->block[0]; |
1da177e4 LT |
1469 | } else { |
1470 | msg[0].len = data->block[0] + 1; | |
30dac746 | 1471 | if (msg[0].len > I2C_SMBUS_BLOCK_MAX + 1) { |
1da177e4 LT |
1472 | dev_err(&adapter->dev, "i2c_smbus_xfer_emulated called with " |
1473 | "invalid block write size (%d)\n", | |
1474 | data->block[0]); | |
1475 | return -1; | |
1476 | } | |
1477 | for (i = 1; i <= data->block[0]; i++) | |
1478 | msgbuf0[i] = data->block[i]; | |
1479 | } | |
1480 | break; | |
1481 | default: | |
1482 | dev_err(&adapter->dev, "smbus_access called with invalid size (%d)\n", | |
1483 | size); | |
1484 | return -1; | |
1485 | } | |
1486 | ||
421ef47b JD |
1487 | i = ((flags & I2C_CLIENT_PEC) && size != I2C_SMBUS_QUICK |
1488 | && size != I2C_SMBUS_I2C_BLOCK_DATA); | |
1489 | if (i) { | |
1490 | /* Compute PEC if first message is a write */ | |
1491 | if (!(msg[0].flags & I2C_M_RD)) { | |
438d6c2c | 1492 | if (num == 1) /* Write only */ |
421ef47b JD |
1493 | i2c_smbus_add_pec(&msg[0]); |
1494 | else /* Write followed by read */ | |
1495 | partial_pec = i2c_smbus_msg_pec(0, &msg[0]); | |
1496 | } | |
1497 | /* Ask for PEC if last message is a read */ | |
1498 | if (msg[num-1].flags & I2C_M_RD) | |
438d6c2c | 1499 | msg[num-1].len++; |
421ef47b JD |
1500 | } |
1501 | ||
1da177e4 LT |
1502 | if (i2c_transfer(adapter, msg, num) < 0) |
1503 | return -1; | |
1504 | ||
421ef47b JD |
1505 | /* Check PEC if last message is a read */ |
1506 | if (i && (msg[num-1].flags & I2C_M_RD)) { | |
1507 | if (i2c_smbus_check_pec(partial_pec, &msg[num-1]) < 0) | |
1508 | return -1; | |
1509 | } | |
1510 | ||
1da177e4 LT |
1511 | if (read_write == I2C_SMBUS_READ) |
1512 | switch(size) { | |
1513 | case I2C_SMBUS_BYTE: | |
1514 | data->byte = msgbuf0[0]; | |
1515 | break; | |
1516 | case I2C_SMBUS_BYTE_DATA: | |
1517 | data->byte = msgbuf1[0]; | |
1518 | break; | |
438d6c2c | 1519 | case I2C_SMBUS_WORD_DATA: |
1da177e4 LT |
1520 | case I2C_SMBUS_PROC_CALL: |
1521 | data->word = msgbuf1[0] | (msgbuf1[1] << 8); | |
1522 | break; | |
1523 | case I2C_SMBUS_I2C_BLOCK_DATA: | |
4b2643d7 | 1524 | for (i = 0; i < data->block[0]; i++) |
1da177e4 LT |
1525 | data->block[i+1] = msgbuf1[i]; |
1526 | break; | |
209d27c3 JD |
1527 | case I2C_SMBUS_BLOCK_DATA: |
1528 | case I2C_SMBUS_BLOCK_PROC_CALL: | |
1529 | for (i = 0; i < msgbuf1[0] + 1; i++) | |
1530 | data->block[i] = msgbuf1[i]; | |
1531 | break; | |
1da177e4 LT |
1532 | } |
1533 | return 0; | |
1534 | } | |
1535 | ||
1536 | ||
1537 | s32 i2c_smbus_xfer(struct i2c_adapter * adapter, u16 addr, unsigned short flags, | |
438d6c2c | 1538 | char read_write, u8 command, int size, |
1da177e4 LT |
1539 | union i2c_smbus_data * data) |
1540 | { | |
1541 | s32 res; | |
1da177e4 LT |
1542 | |
1543 | flags &= I2C_M_TEN | I2C_CLIENT_PEC; | |
1da177e4 LT |
1544 | |
1545 | if (adapter->algo->smbus_xfer) { | |
5c085d36 | 1546 | mutex_lock(&adapter->bus_lock); |
1da177e4 LT |
1547 | res = adapter->algo->smbus_xfer(adapter,addr,flags,read_write, |
1548 | command,size,data); | |
5c085d36 | 1549 | mutex_unlock(&adapter->bus_lock); |
1da177e4 LT |
1550 | } else |
1551 | res = i2c_smbus_xfer_emulated(adapter,addr,flags,read_write, | |
1552 | command,size,data); | |
1553 | ||
1da177e4 LT |
1554 | return res; |
1555 | } | |
1da177e4 | 1556 | EXPORT_SYMBOL(i2c_smbus_xfer); |
1da177e4 LT |
1557 | |
1558 | MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>"); | |
1559 | MODULE_DESCRIPTION("I2C-Bus main module"); | |
1560 | MODULE_LICENSE("GPL"); |