Commit | Line | Data |
---|---|---|
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 | ||
e9f1373b DB |
299 | static int dummy_nop(struct i2c_client *client) |
300 | { | |
301 | return 0; | |
302 | } | |
303 | ||
304 | static struct i2c_driver dummy_driver = { | |
305 | .driver.name = "dummy", | |
306 | .probe = dummy_nop, | |
307 | .remove = dummy_nop, | |
308 | }; | |
309 | ||
310 | /** | |
311 | * i2c_new_dummy - return a new i2c device bound to a dummy driver | |
312 | * @adapter: the adapter managing the device | |
313 | * @address: seven bit address to be used | |
314 | * @type: optional label used for i2c_client.name | |
315 | * Context: can sleep | |
316 | * | |
317 | * This returns an I2C client bound to the "dummy" driver, intended for use | |
318 | * with devices that consume multiple addresses. Examples of such chips | |
319 | * include various EEPROMS (like 24c04 and 24c08 models). | |
320 | * | |
321 | * These dummy devices have two main uses. First, most I2C and SMBus calls | |
322 | * except i2c_transfer() need a client handle; the dummy will be that handle. | |
323 | * And second, this prevents the specified address from being bound to a | |
324 | * different driver. | |
325 | * | |
326 | * This returns the new i2c client, which should be saved for later use with | |
327 | * i2c_unregister_device(); or NULL to indicate an error. | |
328 | */ | |
329 | struct i2c_client * | |
330 | i2c_new_dummy(struct i2c_adapter *adapter, u16 address, const char *type) | |
331 | { | |
332 | struct i2c_board_info info = { | |
333 | .driver_name = "dummy", | |
334 | .addr = address, | |
335 | }; | |
336 | ||
337 | if (type) | |
338 | strlcpy(info.type, type, sizeof info.type); | |
339 | return i2c_new_device(adapter, &info); | |
340 | } | |
341 | EXPORT_SYMBOL_GPL(i2c_new_dummy); | |
342 | ||
f37dd80a DB |
343 | /* ------------------------------------------------------------------------- */ |
344 | ||
16ffadfc DB |
345 | /* I2C bus adapters -- one roots each I2C or SMBUS segment */ |
346 | ||
83eaaed0 | 347 | static void i2c_adapter_dev_release(struct device *dev) |
1da177e4 | 348 | { |
ef2c8321 | 349 | struct i2c_adapter *adap = to_i2c_adapter(dev); |
1da177e4 LT |
350 | complete(&adap->dev_released); |
351 | } | |
352 | ||
16ffadfc DB |
353 | static ssize_t |
354 | show_adapter_name(struct device *dev, struct device_attribute *attr, char *buf) | |
355 | { | |
ef2c8321 | 356 | struct i2c_adapter *adap = to_i2c_adapter(dev); |
16ffadfc DB |
357 | return sprintf(buf, "%s\n", adap->name); |
358 | } | |
b119dc3f | 359 | |
16ffadfc DB |
360 | static struct device_attribute i2c_adapter_attrs[] = { |
361 | __ATTR(name, S_IRUGO, show_adapter_name, NULL), | |
362 | { }, | |
363 | }; | |
b119dc3f | 364 | |
83eaaed0 | 365 | static struct class i2c_adapter_class = { |
b119dc3f DB |
366 | .owner = THIS_MODULE, |
367 | .name = "i2c-adapter", | |
16ffadfc | 368 | .dev_attrs = i2c_adapter_attrs, |
1da177e4 LT |
369 | }; |
370 | ||
9c1600ed DB |
371 | static void i2c_scan_static_board_info(struct i2c_adapter *adapter) |
372 | { | |
373 | struct i2c_devinfo *devinfo; | |
374 | ||
375 | mutex_lock(&__i2c_board_lock); | |
376 | list_for_each_entry(devinfo, &__i2c_board_list, list) { | |
377 | if (devinfo->busnum == adapter->nr | |
378 | && !i2c_new_device(adapter, | |
379 | &devinfo->board_info)) | |
380 | printk(KERN_ERR "i2c-core: can't create i2c%d-%04x\n", | |
381 | i2c_adapter_id(adapter), | |
382 | devinfo->board_info.addr); | |
383 | } | |
384 | mutex_unlock(&__i2c_board_lock); | |
385 | } | |
386 | ||
026526f5 JD |
387 | static int i2c_do_add_adapter(struct device_driver *d, void *data) |
388 | { | |
389 | struct i2c_driver *driver = to_i2c_driver(d); | |
390 | struct i2c_adapter *adap = data; | |
391 | ||
392 | if (driver->attach_adapter) { | |
393 | /* We ignore the return code; if it fails, too bad */ | |
394 | driver->attach_adapter(adap); | |
395 | } | |
396 | return 0; | |
397 | } | |
398 | ||
6e13e641 | 399 | static int i2c_register_adapter(struct i2c_adapter *adap) |
1da177e4 | 400 | { |
026526f5 | 401 | int res = 0, dummy; |
1da177e4 | 402 | |
5c085d36 IM |
403 | mutex_init(&adap->bus_lock); |
404 | mutex_init(&adap->clist_lock); | |
1da177e4 LT |
405 | INIT_LIST_HEAD(&adap->clients); |
406 | ||
caada32a | 407 | mutex_lock(&core_lock); |
6e13e641 | 408 | |
1da177e4 LT |
409 | /* Add the adapter to the driver core. |
410 | * If the parent pointer is not set up, | |
411 | * we add this adapter to the host bus. | |
412 | */ | |
b119dc3f | 413 | if (adap->dev.parent == NULL) { |
1da177e4 | 414 | adap->dev.parent = &platform_bus; |
fe2c8d51 JD |
415 | pr_debug("I2C adapter driver [%s] forgot to specify " |
416 | "physical device\n", adap->name); | |
b119dc3f | 417 | } |
1da177e4 | 418 | sprintf(adap->dev.bus_id, "i2c-%d", adap->nr); |
1da177e4 | 419 | adap->dev.release = &i2c_adapter_dev_release; |
fccb56e4 | 420 | adap->dev.class = &i2c_adapter_class; |
b119c6c9 JD |
421 | res = device_register(&adap->dev); |
422 | if (res) | |
423 | goto out_list; | |
1da177e4 | 424 | |
b6d7b3d1 JD |
425 | dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name); |
426 | ||
6e13e641 DB |
427 | /* create pre-declared device nodes for new-style drivers */ |
428 | if (adap->nr < __i2c_first_dynamic_bus_num) | |
429 | i2c_scan_static_board_info(adap); | |
430 | ||
7b4fbc50 | 431 | /* let legacy drivers scan this bus for matching devices */ |
026526f5 JD |
432 | dummy = bus_for_each_drv(&i2c_bus_type, NULL, adap, |
433 | i2c_do_add_adapter); | |
1da177e4 | 434 | |
1da177e4 | 435 | out_unlock: |
caada32a | 436 | mutex_unlock(&core_lock); |
1da177e4 | 437 | return res; |
b119c6c9 | 438 | |
b119c6c9 | 439 | out_list: |
b119c6c9 JD |
440 | idr_remove(&i2c_adapter_idr, adap->nr); |
441 | goto out_unlock; | |
1da177e4 LT |
442 | } |
443 | ||
6e13e641 DB |
444 | /** |
445 | * i2c_add_adapter - declare i2c adapter, use dynamic bus number | |
446 | * @adapter: the adapter to add | |
d64f73be | 447 | * Context: can sleep |
6e13e641 DB |
448 | * |
449 | * This routine is used to declare an I2C adapter when its bus number | |
450 | * doesn't matter. Examples: for I2C adapters dynamically added by | |
451 | * USB links or PCI plugin cards. | |
452 | * | |
453 | * When this returns zero, a new bus number was allocated and stored | |
454 | * in adap->nr, and the specified adapter became available for clients. | |
455 | * Otherwise, a negative errno value is returned. | |
456 | */ | |
457 | int i2c_add_adapter(struct i2c_adapter *adapter) | |
458 | { | |
459 | int id, res = 0; | |
460 | ||
461 | retry: | |
462 | if (idr_pre_get(&i2c_adapter_idr, GFP_KERNEL) == 0) | |
463 | return -ENOMEM; | |
464 | ||
caada32a | 465 | mutex_lock(&core_lock); |
6e13e641 DB |
466 | /* "above" here means "above or equal to", sigh */ |
467 | res = idr_get_new_above(&i2c_adapter_idr, adapter, | |
468 | __i2c_first_dynamic_bus_num, &id); | |
caada32a | 469 | mutex_unlock(&core_lock); |
6e13e641 DB |
470 | |
471 | if (res < 0) { | |
472 | if (res == -EAGAIN) | |
473 | goto retry; | |
474 | return res; | |
475 | } | |
476 | ||
477 | adapter->nr = id; | |
478 | return i2c_register_adapter(adapter); | |
479 | } | |
480 | EXPORT_SYMBOL(i2c_add_adapter); | |
481 | ||
482 | /** | |
483 | * i2c_add_numbered_adapter - declare i2c adapter, use static bus number | |
484 | * @adap: the adapter to register (with adap->nr initialized) | |
d64f73be | 485 | * Context: can sleep |
6e13e641 DB |
486 | * |
487 | * This routine is used to declare an I2C adapter when its bus number | |
488 | * matters. Example: for I2C adapters from system-on-chip CPUs, or | |
489 | * otherwise built in to the system's mainboard, and where i2c_board_info | |
490 | * is used to properly configure I2C devices. | |
491 | * | |
492 | * If no devices have pre-been declared for this bus, then be sure to | |
493 | * register the adapter before any dynamically allocated ones. Otherwise | |
494 | * the required bus ID may not be available. | |
495 | * | |
496 | * When this returns zero, the specified adapter became available for | |
497 | * clients using the bus number provided in adap->nr. Also, the table | |
498 | * of I2C devices pre-declared using i2c_register_board_info() is scanned, | |
499 | * and the appropriate driver model device nodes are created. Otherwise, a | |
500 | * negative errno value is returned. | |
501 | */ | |
502 | int i2c_add_numbered_adapter(struct i2c_adapter *adap) | |
503 | { | |
504 | int id; | |
505 | int status; | |
506 | ||
507 | if (adap->nr & ~MAX_ID_MASK) | |
508 | return -EINVAL; | |
509 | ||
510 | retry: | |
511 | if (idr_pre_get(&i2c_adapter_idr, GFP_KERNEL) == 0) | |
512 | return -ENOMEM; | |
513 | ||
caada32a | 514 | mutex_lock(&core_lock); |
6e13e641 DB |
515 | /* "above" here means "above or equal to", sigh; |
516 | * we need the "equal to" result to force the result | |
517 | */ | |
518 | status = idr_get_new_above(&i2c_adapter_idr, adap, adap->nr, &id); | |
519 | if (status == 0 && id != adap->nr) { | |
520 | status = -EBUSY; | |
521 | idr_remove(&i2c_adapter_idr, id); | |
522 | } | |
caada32a | 523 | mutex_unlock(&core_lock); |
6e13e641 DB |
524 | if (status == -EAGAIN) |
525 | goto retry; | |
526 | ||
527 | if (status == 0) | |
528 | status = i2c_register_adapter(adap); | |
529 | return status; | |
530 | } | |
531 | EXPORT_SYMBOL_GPL(i2c_add_numbered_adapter); | |
532 | ||
026526f5 JD |
533 | static int i2c_do_del_adapter(struct device_driver *d, void *data) |
534 | { | |
535 | struct i2c_driver *driver = to_i2c_driver(d); | |
536 | struct i2c_adapter *adapter = data; | |
537 | int res; | |
538 | ||
539 | if (!driver->detach_adapter) | |
540 | return 0; | |
541 | res = driver->detach_adapter(adapter); | |
542 | if (res) | |
543 | dev_err(&adapter->dev, "detach_adapter failed (%d) " | |
544 | "for driver [%s]\n", res, driver->driver.name); | |
545 | return res; | |
546 | } | |
547 | ||
d64f73be DB |
548 | /** |
549 | * i2c_del_adapter - unregister I2C adapter | |
550 | * @adap: the adapter being unregistered | |
551 | * Context: can sleep | |
552 | * | |
553 | * This unregisters an I2C adapter which was previously registered | |
554 | * by @i2c_add_adapter or @i2c_add_numbered_adapter. | |
555 | */ | |
1da177e4 LT |
556 | int i2c_del_adapter(struct i2c_adapter *adap) |
557 | { | |
558 | struct list_head *item, *_n; | |
1da177e4 LT |
559 | struct i2c_client *client; |
560 | int res = 0; | |
561 | ||
caada32a | 562 | mutex_lock(&core_lock); |
1da177e4 LT |
563 | |
564 | /* First make sure that this adapter was ever added */ | |
87c6c229 | 565 | if (idr_find(&i2c_adapter_idr, adap->nr) != adap) { |
b6d7b3d1 JD |
566 | pr_debug("i2c-core: attempting to delete unregistered " |
567 | "adapter [%s]\n", adap->name); | |
1da177e4 LT |
568 | res = -EINVAL; |
569 | goto out_unlock; | |
570 | } | |
571 | ||
026526f5 JD |
572 | /* Tell drivers about this removal */ |
573 | res = bus_for_each_drv(&i2c_bus_type, NULL, adap, | |
574 | i2c_do_del_adapter); | |
575 | if (res) | |
576 | goto out_unlock; | |
1da177e4 LT |
577 | |
578 | /* detach any active clients. This must be done first, because | |
a551acc2 | 579 | * it can fail; in which case we give up. */ |
1da177e4 | 580 | list_for_each_safe(item, _n, &adap->clients) { |
a1d9e6e4 DB |
581 | struct i2c_driver *driver; |
582 | ||
1da177e4 | 583 | client = list_entry(item, struct i2c_client, list); |
a1d9e6e4 DB |
584 | driver = client->driver; |
585 | ||
586 | /* new style, follow standard driver model */ | |
587 | if (!driver || is_newstyle_driver(driver)) { | |
588 | i2c_unregister_device(client); | |
589 | continue; | |
590 | } | |
1da177e4 | 591 | |
a1d9e6e4 DB |
592 | /* legacy drivers create and remove clients themselves */ |
593 | if ((res = driver->detach_client(client))) { | |
b6d7b3d1 JD |
594 | dev_err(&adap->dev, "detach_client failed for client " |
595 | "[%s] at address 0x%02x\n", client->name, | |
1da177e4 LT |
596 | client->addr); |
597 | goto out_unlock; | |
598 | } | |
599 | } | |
600 | ||
601 | /* clean up the sysfs representation */ | |
602 | init_completion(&adap->dev_released); | |
1da177e4 | 603 | device_unregister(&adap->dev); |
1da177e4 LT |
604 | |
605 | /* wait for sysfs to drop all references */ | |
606 | wait_for_completion(&adap->dev_released); | |
1da177e4 | 607 | |
6e13e641 | 608 | /* free bus id */ |
1da177e4 LT |
609 | idr_remove(&i2c_adapter_idr, adap->nr); |
610 | ||
b6d7b3d1 | 611 | dev_dbg(&adap->dev, "adapter [%s] unregistered\n", adap->name); |
1da177e4 LT |
612 | |
613 | out_unlock: | |
caada32a | 614 | mutex_unlock(&core_lock); |
1da177e4 LT |
615 | return res; |
616 | } | |
c0564606 | 617 | EXPORT_SYMBOL(i2c_del_adapter); |
1da177e4 LT |
618 | |
619 | ||
7b4fbc50 DB |
620 | /* ------------------------------------------------------------------------- */ |
621 | ||
622 | /* | |
623 | * An i2c_driver is used with one or more i2c_client (device) nodes to access | |
624 | * i2c slave chips, on a bus instance associated with some i2c_adapter. There | |
625 | * are two models for binding the driver to its device: "new style" drivers | |
626 | * follow the standard Linux driver model and just respond to probe() calls | |
627 | * issued if the driver core sees they match(); "legacy" drivers create device | |
628 | * nodes themselves. | |
1da177e4 LT |
629 | */ |
630 | ||
de59cf9e | 631 | int i2c_register_driver(struct module *owner, struct i2c_driver *driver) |
1da177e4 | 632 | { |
7eebcb7c | 633 | int res; |
1da177e4 | 634 | |
7b4fbc50 | 635 | /* new style driver methods can't mix with legacy ones */ |
a1d9e6e4 | 636 | if (is_newstyle_driver(driver)) { |
7b4fbc50 DB |
637 | if (driver->attach_adapter || driver->detach_adapter |
638 | || driver->detach_client) { | |
639 | printk(KERN_WARNING | |
640 | "i2c-core: driver [%s] is confused\n", | |
641 | driver->driver.name); | |
642 | return -EINVAL; | |
643 | } | |
644 | } | |
645 | ||
1da177e4 | 646 | /* add the driver to the list of i2c drivers in the driver core */ |
de59cf9e | 647 | driver->driver.owner = owner; |
1da177e4 | 648 | driver->driver.bus = &i2c_bus_type; |
1da177e4 | 649 | |
6e13e641 DB |
650 | /* for new style drivers, when registration returns the driver core |
651 | * will have called probe() for all matching-but-unbound devices. | |
652 | */ | |
1da177e4 LT |
653 | res = driver_register(&driver->driver); |
654 | if (res) | |
7eebcb7c | 655 | return res; |
438d6c2c | 656 | |
caada32a | 657 | mutex_lock(&core_lock); |
7eebcb7c | 658 | |
35d8b2e6 | 659 | pr_debug("i2c-core: driver [%s] registered\n", driver->driver.name); |
1da177e4 | 660 | |
7b4fbc50 | 661 | /* legacy drivers scan i2c busses directly */ |
8a994755 | 662 | if (driver->attach_adapter) { |
4ad4eac6 DB |
663 | struct i2c_adapter *adapter; |
664 | ||
87c6c229 JD |
665 | down(&i2c_adapter_class.sem); |
666 | list_for_each_entry(adapter, &i2c_adapter_class.devices, | |
667 | dev.node) { | |
1da177e4 LT |
668 | driver->attach_adapter(adapter); |
669 | } | |
87c6c229 | 670 | up(&i2c_adapter_class.sem); |
1da177e4 LT |
671 | } |
672 | ||
caada32a | 673 | mutex_unlock(&core_lock); |
7eebcb7c | 674 | return 0; |
1da177e4 | 675 | } |
de59cf9e | 676 | EXPORT_SYMBOL(i2c_register_driver); |
1da177e4 | 677 | |
a1d9e6e4 DB |
678 | /** |
679 | * i2c_del_driver - unregister I2C driver | |
680 | * @driver: the driver being unregistered | |
d64f73be | 681 | * Context: can sleep |
a1d9e6e4 | 682 | */ |
b3e82096 | 683 | void i2c_del_driver(struct i2c_driver *driver) |
1da177e4 | 684 | { |
87c6c229 | 685 | struct list_head *item2, *_n; |
1da177e4 LT |
686 | struct i2c_client *client; |
687 | struct i2c_adapter *adap; | |
438d6c2c | 688 | |
caada32a | 689 | mutex_lock(&core_lock); |
1da177e4 | 690 | |
a1d9e6e4 DB |
691 | /* new-style driver? */ |
692 | if (is_newstyle_driver(driver)) | |
693 | goto unregister; | |
694 | ||
1da177e4 | 695 | /* Have a look at each adapter, if clients of this driver are still |
438d6c2c | 696 | * attached. If so, detach them to be able to kill the driver |
1da177e4 | 697 | * afterwards. |
1da177e4 | 698 | */ |
87c6c229 JD |
699 | down(&i2c_adapter_class.sem); |
700 | list_for_each_entry(adap, &i2c_adapter_class.devices, dev.node) { | |
1da177e4 | 701 | if (driver->detach_adapter) { |
b3e82096 | 702 | if (driver->detach_adapter(adap)) { |
b6d7b3d1 | 703 | dev_err(&adap->dev, "detach_adapter failed " |
35d8b2e6 LR |
704 | "for driver [%s]\n", |
705 | driver->driver.name); | |
1da177e4 LT |
706 | } |
707 | } else { | |
708 | list_for_each_safe(item2, _n, &adap->clients) { | |
709 | client = list_entry(item2, struct i2c_client, list); | |
710 | if (client->driver != driver) | |
711 | continue; | |
b6d7b3d1 JD |
712 | dev_dbg(&adap->dev, "detaching client [%s] " |
713 | "at 0x%02x\n", client->name, | |
714 | client->addr); | |
b3e82096 | 715 | if (driver->detach_client(client)) { |
b6d7b3d1 JD |
716 | dev_err(&adap->dev, "detach_client " |
717 | "failed for client [%s] at " | |
718 | "0x%02x\n", client->name, | |
1da177e4 | 719 | client->addr); |
1da177e4 LT |
720 | } |
721 | } | |
722 | } | |
723 | } | |
87c6c229 | 724 | up(&i2c_adapter_class.sem); |
1da177e4 | 725 | |
a1d9e6e4 | 726 | unregister: |
1da177e4 | 727 | driver_unregister(&driver->driver); |
35d8b2e6 | 728 | pr_debug("i2c-core: driver [%s] unregistered\n", driver->driver.name); |
1da177e4 | 729 | |
caada32a | 730 | mutex_unlock(&core_lock); |
1da177e4 | 731 | } |
c0564606 | 732 | EXPORT_SYMBOL(i2c_del_driver); |
1da177e4 | 733 | |
7b4fbc50 DB |
734 | /* ------------------------------------------------------------------------- */ |
735 | ||
9b766b81 | 736 | static int __i2c_check_addr(struct device *dev, void *addrp) |
1da177e4 | 737 | { |
9b766b81 DB |
738 | struct i2c_client *client = i2c_verify_client(dev); |
739 | int addr = *(int *)addrp; | |
1da177e4 | 740 | |
9b766b81 DB |
741 | if (client && client->addr == addr) |
742 | return -EBUSY; | |
1da177e4 LT |
743 | return 0; |
744 | } | |
745 | ||
5e31c2bd | 746 | static int i2c_check_addr(struct i2c_adapter *adapter, int addr) |
1da177e4 | 747 | { |
9b766b81 | 748 | return device_for_each_child(&adapter->dev, &addr, __i2c_check_addr); |
1da177e4 LT |
749 | } |
750 | ||
751 | int i2c_attach_client(struct i2c_client *client) | |
752 | { | |
753 | struct i2c_adapter *adapter = client->adapter; | |
b119c6c9 | 754 | int res = 0; |
1da177e4 | 755 | |
1da177e4 | 756 | client->dev.parent = &client->adapter->dev; |
1da177e4 | 757 | client->dev.bus = &i2c_bus_type; |
9c1600ed DB |
758 | |
759 | if (client->driver) | |
760 | client->dev.driver = &client->driver->driver; | |
761 | ||
de81d2aa | 762 | if (client->driver && !is_newstyle_driver(client->driver)) { |
9c1600ed | 763 | client->dev.release = i2c_client_release; |
de81d2aa DB |
764 | client->dev.uevent_suppress = 1; |
765 | } else | |
9c1600ed | 766 | client->dev.release = i2c_client_dev_release; |
438d6c2c | 767 | |
1da177e4 LT |
768 | snprintf(&client->dev.bus_id[0], sizeof(client->dev.bus_id), |
769 | "%d-%04x", i2c_adapter_id(adapter), client->addr); | |
b119c6c9 JD |
770 | res = device_register(&client->dev); |
771 | if (res) | |
86ec5ec8 DB |
772 | goto out_err; |
773 | ||
774 | mutex_lock(&adapter->clist_lock); | |
775 | list_add_tail(&client->list, &adapter->clients); | |
b119c6c9 | 776 | mutex_unlock(&adapter->clist_lock); |
77ed74da | 777 | |
86ec5ec8 DB |
778 | dev_dbg(&adapter->dev, "client [%s] registered with bus id %s\n", |
779 | client->name, client->dev.bus_id); | |
780 | ||
77ed74da JD |
781 | if (adapter->client_register) { |
782 | if (adapter->client_register(client)) { | |
783 | dev_dbg(&adapter->dev, "client_register " | |
784 | "failed for client [%s] at 0x%02x\n", | |
785 | client->name, client->addr); | |
786 | } | |
787 | } | |
788 | ||
789 | return 0; | |
b119c6c9 | 790 | |
86ec5ec8 | 791 | out_err: |
b119c6c9 JD |
792 | dev_err(&adapter->dev, "Failed to attach i2c client %s at 0x%02x " |
793 | "(%d)\n", client->name, client->addr, res); | |
77ed74da | 794 | return res; |
1da177e4 | 795 | } |
c0564606 | 796 | EXPORT_SYMBOL(i2c_attach_client); |
1da177e4 LT |
797 | |
798 | int i2c_detach_client(struct i2c_client *client) | |
799 | { | |
800 | struct i2c_adapter *adapter = client->adapter; | |
801 | int res = 0; | |
438d6c2c | 802 | |
1da177e4 LT |
803 | if (adapter->client_unregister) { |
804 | res = adapter->client_unregister(client); | |
805 | if (res) { | |
806 | dev_err(&client->dev, | |
86749e85 JD |
807 | "client_unregister [%s] failed, " |
808 | "client not detached\n", client->name); | |
1da177e4 LT |
809 | goto out; |
810 | } | |
811 | } | |
812 | ||
5c085d36 | 813 | mutex_lock(&adapter->clist_lock); |
1da177e4 | 814 | list_del(&client->list); |
9ddced16 JD |
815 | mutex_unlock(&adapter->clist_lock); |
816 | ||
1da177e4 | 817 | init_completion(&client->released); |
1da177e4 | 818 | device_unregister(&client->dev); |
1da177e4 LT |
819 | wait_for_completion(&client->released); |
820 | ||
821 | out: | |
822 | return res; | |
823 | } | |
c0564606 | 824 | EXPORT_SYMBOL(i2c_detach_client); |
1da177e4 | 825 | |
e48d3319 JD |
826 | /** |
827 | * i2c_use_client - increments the reference count of the i2c client structure | |
828 | * @client: the client being referenced | |
829 | * | |
830 | * Each live reference to a client should be refcounted. The driver model does | |
831 | * that automatically as part of driver binding, so that most drivers don't | |
832 | * need to do this explicitly: they hold a reference until they're unbound | |
833 | * from the device. | |
834 | * | |
835 | * A pointer to the client with the incremented reference counter is returned. | |
836 | */ | |
837 | struct i2c_client *i2c_use_client(struct i2c_client *client) | |
1da177e4 | 838 | { |
bdc511f4 | 839 | get_device(&client->dev); |
e48d3319 | 840 | return client; |
1da177e4 | 841 | } |
c0564606 | 842 | EXPORT_SYMBOL(i2c_use_client); |
1da177e4 | 843 | |
e48d3319 JD |
844 | /** |
845 | * i2c_release_client - release a use of the i2c client structure | |
846 | * @client: the client being no longer referenced | |
847 | * | |
848 | * Must be called when a user of a client is finished with it. | |
849 | */ | |
850 | void i2c_release_client(struct i2c_client *client) | |
1da177e4 | 851 | { |
bdc511f4 | 852 | put_device(&client->dev); |
1da177e4 | 853 | } |
c0564606 | 854 | EXPORT_SYMBOL(i2c_release_client); |
1da177e4 | 855 | |
9b766b81 DB |
856 | struct i2c_cmd_arg { |
857 | unsigned cmd; | |
858 | void *arg; | |
859 | }; | |
860 | ||
861 | static int i2c_cmd(struct device *dev, void *_arg) | |
862 | { | |
863 | struct i2c_client *client = i2c_verify_client(dev); | |
864 | struct i2c_cmd_arg *arg = _arg; | |
865 | ||
866 | if (client && client->driver && client->driver->command) | |
867 | client->driver->command(client, arg->cmd, arg->arg); | |
868 | return 0; | |
869 | } | |
870 | ||
1da177e4 LT |
871 | void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg) |
872 | { | |
9b766b81 | 873 | struct i2c_cmd_arg cmd_arg; |
1da177e4 | 874 | |
9b766b81 DB |
875 | cmd_arg.cmd = cmd; |
876 | cmd_arg.arg = arg; | |
877 | device_for_each_child(&adap->dev, &cmd_arg, i2c_cmd); | |
1da177e4 | 878 | } |
c0564606 | 879 | EXPORT_SYMBOL(i2c_clients_command); |
1da177e4 LT |
880 | |
881 | static int __init i2c_init(void) | |
882 | { | |
883 | int retval; | |
884 | ||
885 | retval = bus_register(&i2c_bus_type); | |
1da177e4 LT |
886 | if (retval) |
887 | return retval; | |
e9f1373b DB |
888 | retval = class_register(&i2c_adapter_class); |
889 | if (retval) | |
890 | goto bus_err; | |
891 | retval = i2c_add_driver(&dummy_driver); | |
892 | if (retval) | |
893 | goto class_err; | |
894 | return 0; | |
895 | ||
896 | class_err: | |
897 | class_unregister(&i2c_adapter_class); | |
898 | bus_err: | |
899 | bus_unregister(&i2c_bus_type); | |
900 | return retval; | |
1da177e4 LT |
901 | } |
902 | ||
903 | static void __exit i2c_exit(void) | |
904 | { | |
e9f1373b | 905 | i2c_del_driver(&dummy_driver); |
1da177e4 | 906 | class_unregister(&i2c_adapter_class); |
1da177e4 LT |
907 | bus_unregister(&i2c_bus_type); |
908 | } | |
909 | ||
910 | subsys_initcall(i2c_init); | |
911 | module_exit(i2c_exit); | |
912 | ||
913 | /* ---------------------------------------------------- | |
914 | * the functional interface to the i2c busses. | |
915 | * ---------------------------------------------------- | |
916 | */ | |
917 | ||
918 | int i2c_transfer(struct i2c_adapter * adap, struct i2c_msg *msgs, int num) | |
919 | { | |
920 | int ret; | |
921 | ||
922 | if (adap->algo->master_xfer) { | |
923 | #ifdef DEBUG | |
924 | for (ret = 0; ret < num; ret++) { | |
925 | dev_dbg(&adap->dev, "master_xfer[%d] %c, addr=0x%02x, " | |
209d27c3 JD |
926 | "len=%d%s\n", ret, (msgs[ret].flags & I2C_M_RD) |
927 | ? 'R' : 'W', msgs[ret].addr, msgs[ret].len, | |
928 | (msgs[ret].flags & I2C_M_RECV_LEN) ? "+" : ""); | |
1da177e4 LT |
929 | } |
930 | #endif | |
931 | ||
cea443a8 MR |
932 | if (in_atomic() || irqs_disabled()) { |
933 | ret = mutex_trylock(&adap->bus_lock); | |
934 | if (!ret) | |
935 | /* I2C activity is ongoing. */ | |
936 | return -EAGAIN; | |
937 | } else { | |
938 | mutex_lock_nested(&adap->bus_lock, adap->level); | |
939 | } | |
940 | ||
1da177e4 | 941 | ret = adap->algo->master_xfer(adap,msgs,num); |
5c085d36 | 942 | mutex_unlock(&adap->bus_lock); |
1da177e4 LT |
943 | |
944 | return ret; | |
945 | } else { | |
946 | dev_dbg(&adap->dev, "I2C level transfers not supported\n"); | |
947 | return -ENOSYS; | |
948 | } | |
949 | } | |
c0564606 | 950 | EXPORT_SYMBOL(i2c_transfer); |
1da177e4 LT |
951 | |
952 | int i2c_master_send(struct i2c_client *client,const char *buf ,int count) | |
953 | { | |
954 | int ret; | |
955 | struct i2c_adapter *adap=client->adapter; | |
956 | struct i2c_msg msg; | |
957 | ||
815f55f2 JD |
958 | msg.addr = client->addr; |
959 | msg.flags = client->flags & I2C_M_TEN; | |
960 | msg.len = count; | |
961 | msg.buf = (char *)buf; | |
438d6c2c | 962 | |
815f55f2 | 963 | ret = i2c_transfer(adap, &msg, 1); |
1da177e4 | 964 | |
815f55f2 JD |
965 | /* If everything went ok (i.e. 1 msg transmitted), return #bytes |
966 | transmitted, else error code. */ | |
967 | return (ret == 1) ? count : ret; | |
1da177e4 | 968 | } |
c0564606 | 969 | EXPORT_SYMBOL(i2c_master_send); |
1da177e4 LT |
970 | |
971 | int i2c_master_recv(struct i2c_client *client, char *buf ,int count) | |
972 | { | |
973 | struct i2c_adapter *adap=client->adapter; | |
974 | struct i2c_msg msg; | |
975 | int ret; | |
815f55f2 JD |
976 | |
977 | msg.addr = client->addr; | |
978 | msg.flags = client->flags & I2C_M_TEN; | |
979 | msg.flags |= I2C_M_RD; | |
980 | msg.len = count; | |
981 | msg.buf = buf; | |
982 | ||
983 | ret = i2c_transfer(adap, &msg, 1); | |
984 | ||
985 | /* If everything went ok (i.e. 1 msg transmitted), return #bytes | |
986 | transmitted, else error code. */ | |
987 | return (ret == 1) ? count : ret; | |
1da177e4 | 988 | } |
c0564606 | 989 | EXPORT_SYMBOL(i2c_master_recv); |
1da177e4 | 990 | |
1da177e4 LT |
991 | /* ---------------------------------------------------- |
992 | * the i2c address scanning function | |
993 | * Will not work for 10-bit addresses! | |
994 | * ---------------------------------------------------- | |
995 | */ | |
a89ba0bc JD |
996 | static int i2c_probe_address(struct i2c_adapter *adapter, int addr, int kind, |
997 | int (*found_proc) (struct i2c_adapter *, int, int)) | |
998 | { | |
999 | int err; | |
1000 | ||
1001 | /* Make sure the address is valid */ | |
1002 | if (addr < 0x03 || addr > 0x77) { | |
1003 | dev_warn(&adapter->dev, "Invalid probe address 0x%02x\n", | |
1004 | addr); | |
1005 | return -EINVAL; | |
9fc6adfa JD |
1006 | } |
1007 | ||
a89ba0bc JD |
1008 | /* Skip if already in use */ |
1009 | if (i2c_check_addr(adapter, addr)) | |
1010 | return 0; | |
1011 | ||
1012 | /* Make sure there is something at this address, unless forced */ | |
4c9337da JD |
1013 | if (kind < 0) { |
1014 | if (i2c_smbus_xfer(adapter, addr, 0, 0, 0, | |
1015 | I2C_SMBUS_QUICK, NULL) < 0) | |
1016 | return 0; | |
1017 | ||
1018 | /* prevent 24RF08 corruption */ | |
1019 | if ((addr & ~0x0f) == 0x50) | |
1020 | i2c_smbus_xfer(adapter, addr, 0, 0, 0, | |
1021 | I2C_SMBUS_QUICK, NULL); | |
1022 | } | |
a89ba0bc JD |
1023 | |
1024 | /* Finally call the custom detection function */ | |
1025 | err = found_proc(adapter, addr, kind); | |
a89ba0bc JD |
1026 | /* -ENODEV can be returned if there is a chip at the given address |
1027 | but it isn't supported by this chip driver. We catch it here as | |
1028 | this isn't an error. */ | |
114fd183 JD |
1029 | if (err == -ENODEV) |
1030 | err = 0; | |
1031 | ||
1032 | if (err) | |
1033 | dev_warn(&adapter->dev, "Client creation failed at 0x%x (%d)\n", | |
1034 | addr, err); | |
1035 | return err; | |
9fc6adfa JD |
1036 | } |
1037 | ||
1da177e4 | 1038 | int i2c_probe(struct i2c_adapter *adapter, |
bfb6df24 | 1039 | const struct i2c_client_address_data *address_data, |
1da177e4 LT |
1040 | int (*found_proc) (struct i2c_adapter *, int, int)) |
1041 | { | |
a89ba0bc | 1042 | int i, err; |
1da177e4 LT |
1043 | int adap_id = i2c_adapter_id(adapter); |
1044 | ||
a89ba0bc JD |
1045 | /* Force entries are done first, and are not affected by ignore |
1046 | entries */ | |
1047 | if (address_data->forces) { | |
bfb6df24 | 1048 | const unsigned short * const *forces = address_data->forces; |
a89ba0bc JD |
1049 | int kind; |
1050 | ||
1051 | for (kind = 0; forces[kind]; kind++) { | |
1052 | for (i = 0; forces[kind][i] != I2C_CLIENT_END; | |
1053 | i += 2) { | |
1054 | if (forces[kind][i] == adap_id | |
1055 | || forces[kind][i] == ANY_I2C_BUS) { | |
1056 | dev_dbg(&adapter->dev, "found force " | |
1057 | "parameter for adapter %d, " | |
1058 | "addr 0x%02x, kind %d\n", | |
1059 | adap_id, forces[kind][i + 1], | |
1060 | kind); | |
1061 | err = i2c_probe_address(adapter, | |
1062 | forces[kind][i + 1], | |
1063 | kind, found_proc); | |
1064 | if (err) | |
1065 | return err; | |
1066 | } | |
1da177e4 LT |
1067 | } |
1068 | } | |
a89ba0bc | 1069 | } |
1da177e4 | 1070 | |
4366dc94 JD |
1071 | /* Stop here if we can't use SMBUS_QUICK */ |
1072 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_QUICK)) { | |
1073 | if (address_data->probe[0] == I2C_CLIENT_END | |
1074 | && address_data->normal_i2c[0] == I2C_CLIENT_END) | |
438d6c2c | 1075 | return 0; |
4366dc94 JD |
1076 | |
1077 | dev_warn(&adapter->dev, "SMBus Quick command not supported, " | |
1078 | "can't probe for chips\n"); | |
1079 | return -1; | |
1080 | } | |
1081 | ||
a89ba0bc JD |
1082 | /* Probe entries are done second, and are not affected by ignore |
1083 | entries either */ | |
1084 | for (i = 0; address_data->probe[i] != I2C_CLIENT_END; i += 2) { | |
1085 | if (address_data->probe[i] == adap_id | |
1086 | || address_data->probe[i] == ANY_I2C_BUS) { | |
1087 | dev_dbg(&adapter->dev, "found probe parameter for " | |
1088 | "adapter %d, addr 0x%02x\n", adap_id, | |
1089 | address_data->probe[i + 1]); | |
1090 | err = i2c_probe_address(adapter, | |
1091 | address_data->probe[i + 1], | |
1092 | -1, found_proc); | |
1093 | if (err) | |
1094 | return err; | |
1da177e4 | 1095 | } |
a89ba0bc | 1096 | } |
1da177e4 | 1097 | |
a89ba0bc JD |
1098 | /* Normal entries are done last, unless shadowed by an ignore entry */ |
1099 | for (i = 0; address_data->normal_i2c[i] != I2C_CLIENT_END; i += 1) { | |
1100 | int j, ignore; | |
1101 | ||
1102 | ignore = 0; | |
1103 | for (j = 0; address_data->ignore[j] != I2C_CLIENT_END; | |
1104 | j += 2) { | |
1105 | if ((address_data->ignore[j] == adap_id || | |
1106 | address_data->ignore[j] == ANY_I2C_BUS) | |
1107 | && address_data->ignore[j + 1] | |
1108 | == address_data->normal_i2c[i]) { | |
1109 | dev_dbg(&adapter->dev, "found ignore " | |
1110 | "parameter for adapter %d, " | |
1111 | "addr 0x%02x\n", adap_id, | |
1112 | address_data->ignore[j + 1]); | |
2369df93 MH |
1113 | ignore = 1; |
1114 | break; | |
1da177e4 LT |
1115 | } |
1116 | } | |
a89ba0bc | 1117 | if (ignore) |
1da177e4 LT |
1118 | continue; |
1119 | ||
a89ba0bc JD |
1120 | dev_dbg(&adapter->dev, "found normal entry for adapter %d, " |
1121 | "addr 0x%02x\n", adap_id, | |
1122 | address_data->normal_i2c[i]); | |
1123 | err = i2c_probe_address(adapter, address_data->normal_i2c[i], | |
1124 | -1, found_proc); | |
1125 | if (err) | |
1126 | return err; | |
1da177e4 | 1127 | } |
a89ba0bc | 1128 | |
1da177e4 LT |
1129 | return 0; |
1130 | } | |
c0564606 | 1131 | EXPORT_SYMBOL(i2c_probe); |
1da177e4 | 1132 | |
12b5053a JD |
1133 | struct i2c_client * |
1134 | i2c_new_probed_device(struct i2c_adapter *adap, | |
1135 | struct i2c_board_info *info, | |
1136 | unsigned short const *addr_list) | |
1137 | { | |
1138 | int i; | |
1139 | ||
1140 | /* Stop here if the bus doesn't support probing */ | |
1141 | if (!i2c_check_functionality(adap, I2C_FUNC_SMBUS_READ_BYTE)) { | |
1142 | dev_err(&adap->dev, "Probing not supported\n"); | |
1143 | return NULL; | |
1144 | } | |
1145 | ||
12b5053a JD |
1146 | for (i = 0; addr_list[i] != I2C_CLIENT_END; i++) { |
1147 | /* Check address validity */ | |
1148 | if (addr_list[i] < 0x03 || addr_list[i] > 0x77) { | |
1149 | dev_warn(&adap->dev, "Invalid 7-bit address " | |
1150 | "0x%02x\n", addr_list[i]); | |
1151 | continue; | |
1152 | } | |
1153 | ||
1154 | /* Check address availability */ | |
9b766b81 | 1155 | if (i2c_check_addr(adap, addr_list[i])) { |
12b5053a JD |
1156 | dev_dbg(&adap->dev, "Address 0x%02x already in " |
1157 | "use, not probing\n", addr_list[i]); | |
1158 | continue; | |
1159 | } | |
1160 | ||
1161 | /* Test address responsiveness | |
1162 | The default probe method is a quick write, but it is known | |
1163 | to corrupt the 24RF08 EEPROMs due to a state machine bug, | |
1164 | and could also irreversibly write-protect some EEPROMs, so | |
1165 | for address ranges 0x30-0x37 and 0x50-0x5f, we use a byte | |
1166 | read instead. Also, some bus drivers don't implement | |
1167 | quick write, so we fallback to a byte read it that case | |
1168 | too. */ | |
1169 | if ((addr_list[i] & ~0x07) == 0x30 | |
1170 | || (addr_list[i] & ~0x0f) == 0x50 | |
1171 | || !i2c_check_functionality(adap, I2C_FUNC_SMBUS_QUICK)) { | |
1172 | if (i2c_smbus_xfer(adap, addr_list[i], 0, | |
1173 | I2C_SMBUS_READ, 0, | |
1174 | I2C_SMBUS_BYTE, NULL) >= 0) | |
1175 | break; | |
1176 | } else { | |
1177 | if (i2c_smbus_xfer(adap, addr_list[i], 0, | |
1178 | I2C_SMBUS_WRITE, 0, | |
1179 | I2C_SMBUS_QUICK, NULL) >= 0) | |
1180 | break; | |
1181 | } | |
1182 | } | |
12b5053a JD |
1183 | |
1184 | if (addr_list[i] == I2C_CLIENT_END) { | |
1185 | dev_dbg(&adap->dev, "Probing failed, no device found\n"); | |
1186 | return NULL; | |
1187 | } | |
1188 | ||
1189 | info->addr = addr_list[i]; | |
1190 | return i2c_new_device(adap, info); | |
1191 | } | |
1192 | EXPORT_SYMBOL_GPL(i2c_new_probed_device); | |
1193 | ||
1da177e4 LT |
1194 | struct i2c_adapter* i2c_get_adapter(int id) |
1195 | { | |
1da177e4 | 1196 | struct i2c_adapter *adapter; |
438d6c2c | 1197 | |
caada32a | 1198 | mutex_lock(&core_lock); |
a0920e10 MH |
1199 | adapter = (struct i2c_adapter *)idr_find(&i2c_adapter_idr, id); |
1200 | if (adapter && !try_module_get(adapter->owner)) | |
1201 | adapter = NULL; | |
1202 | ||
caada32a | 1203 | mutex_unlock(&core_lock); |
a0920e10 | 1204 | return adapter; |
1da177e4 | 1205 | } |
c0564606 | 1206 | EXPORT_SYMBOL(i2c_get_adapter); |
1da177e4 LT |
1207 | |
1208 | void i2c_put_adapter(struct i2c_adapter *adap) | |
1209 | { | |
1210 | module_put(adap->owner); | |
1211 | } | |
c0564606 | 1212 | EXPORT_SYMBOL(i2c_put_adapter); |
1da177e4 LT |
1213 | |
1214 | /* The SMBus parts */ | |
1215 | ||
438d6c2c | 1216 | #define POLY (0x1070U << 3) |
1da177e4 LT |
1217 | static u8 |
1218 | crc8(u16 data) | |
1219 | { | |
1220 | int i; | |
438d6c2c | 1221 | |
1da177e4 | 1222 | for(i = 0; i < 8; i++) { |
438d6c2c | 1223 | if (data & 0x8000) |
1da177e4 LT |
1224 | data = data ^ POLY; |
1225 | data = data << 1; | |
1226 | } | |
1227 | return (u8)(data >> 8); | |
1228 | } | |
1229 | ||
421ef47b JD |
1230 | /* Incremental CRC8 over count bytes in the array pointed to by p */ |
1231 | static u8 i2c_smbus_pec(u8 crc, u8 *p, size_t count) | |
1da177e4 LT |
1232 | { |
1233 | int i; | |
1234 | ||
1235 | for(i = 0; i < count; i++) | |
421ef47b | 1236 | crc = crc8((crc ^ p[i]) << 8); |
1da177e4 LT |
1237 | return crc; |
1238 | } | |
1239 | ||
421ef47b JD |
1240 | /* Assume a 7-bit address, which is reasonable for SMBus */ |
1241 | static u8 i2c_smbus_msg_pec(u8 pec, struct i2c_msg *msg) | |
1da177e4 | 1242 | { |
421ef47b JD |
1243 | /* The address will be sent first */ |
1244 | u8 addr = (msg->addr << 1) | !!(msg->flags & I2C_M_RD); | |
1245 | pec = i2c_smbus_pec(pec, &addr, 1); | |
1246 | ||
1247 | /* The data buffer follows */ | |
1248 | return i2c_smbus_pec(pec, msg->buf, msg->len); | |
1da177e4 LT |
1249 | } |
1250 | ||
421ef47b JD |
1251 | /* Used for write only transactions */ |
1252 | static inline void i2c_smbus_add_pec(struct i2c_msg *msg) | |
1da177e4 | 1253 | { |
421ef47b JD |
1254 | msg->buf[msg->len] = i2c_smbus_msg_pec(0, msg); |
1255 | msg->len++; | |
1da177e4 LT |
1256 | } |
1257 | ||
421ef47b JD |
1258 | /* Return <0 on CRC error |
1259 | If there was a write before this read (most cases) we need to take the | |
1260 | partial CRC from the write part into account. | |
1261 | Note that this function does modify the message (we need to decrease the | |
1262 | message length to hide the CRC byte from the caller). */ | |
1263 | static int i2c_smbus_check_pec(u8 cpec, struct i2c_msg *msg) | |
1da177e4 | 1264 | { |
421ef47b JD |
1265 | u8 rpec = msg->buf[--msg->len]; |
1266 | cpec = i2c_smbus_msg_pec(cpec, msg); | |
1da177e4 | 1267 | |
1da177e4 LT |
1268 | if (rpec != cpec) { |
1269 | pr_debug("i2c-core: Bad PEC 0x%02x vs. 0x%02x\n", | |
1270 | rpec, cpec); | |
1271 | return -1; | |
1272 | } | |
438d6c2c | 1273 | return 0; |
1da177e4 LT |
1274 | } |
1275 | ||
1276 | s32 i2c_smbus_write_quick(struct i2c_client *client, u8 value) | |
1277 | { | |
1278 | return i2c_smbus_xfer(client->adapter,client->addr,client->flags, | |
438d6c2c | 1279 | value,0,I2C_SMBUS_QUICK,NULL); |
1da177e4 | 1280 | } |
c0564606 | 1281 | EXPORT_SYMBOL(i2c_smbus_write_quick); |
1da177e4 LT |
1282 | |
1283 | s32 i2c_smbus_read_byte(struct i2c_client *client) | |
1284 | { | |
1285 | union i2c_smbus_data data; | |
1286 | if (i2c_smbus_xfer(client->adapter,client->addr,client->flags, | |
1287 | I2C_SMBUS_READ,0,I2C_SMBUS_BYTE, &data)) | |
1288 | return -1; | |
1289 | else | |
7eff82c8 | 1290 | return data.byte; |
1da177e4 | 1291 | } |
c0564606 | 1292 | EXPORT_SYMBOL(i2c_smbus_read_byte); |
1da177e4 LT |
1293 | |
1294 | s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value) | |
1295 | { | |
1da177e4 | 1296 | return i2c_smbus_xfer(client->adapter,client->addr,client->flags, |
421ef47b | 1297 | I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); |
1da177e4 | 1298 | } |
c0564606 | 1299 | EXPORT_SYMBOL(i2c_smbus_write_byte); |
1da177e4 LT |
1300 | |
1301 | s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command) | |
1302 | { | |
1303 | union i2c_smbus_data data; | |
1304 | if (i2c_smbus_xfer(client->adapter,client->addr,client->flags, | |
1305 | I2C_SMBUS_READ,command, I2C_SMBUS_BYTE_DATA,&data)) | |
1306 | return -1; | |
1307 | else | |
7eff82c8 | 1308 | return data.byte; |
1da177e4 | 1309 | } |
c0564606 | 1310 | EXPORT_SYMBOL(i2c_smbus_read_byte_data); |
1da177e4 LT |
1311 | |
1312 | s32 i2c_smbus_write_byte_data(struct i2c_client *client, u8 command, u8 value) | |
1313 | { | |
1314 | union i2c_smbus_data data; | |
1315 | data.byte = value; | |
1316 | return i2c_smbus_xfer(client->adapter,client->addr,client->flags, | |
1317 | I2C_SMBUS_WRITE,command, | |
1318 | I2C_SMBUS_BYTE_DATA,&data); | |
1319 | } | |
c0564606 | 1320 | EXPORT_SYMBOL(i2c_smbus_write_byte_data); |
1da177e4 LT |
1321 | |
1322 | s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command) | |
1323 | { | |
1324 | union i2c_smbus_data data; | |
1325 | if (i2c_smbus_xfer(client->adapter,client->addr,client->flags, | |
1326 | I2C_SMBUS_READ,command, I2C_SMBUS_WORD_DATA, &data)) | |
1327 | return -1; | |
1328 | else | |
7eff82c8 | 1329 | return data.word; |
1da177e4 | 1330 | } |
c0564606 | 1331 | EXPORT_SYMBOL(i2c_smbus_read_word_data); |
1da177e4 LT |
1332 | |
1333 | s32 i2c_smbus_write_word_data(struct i2c_client *client, u8 command, u16 value) | |
1334 | { | |
1335 | union i2c_smbus_data data; | |
1336 | data.word = value; | |
1337 | return i2c_smbus_xfer(client->adapter,client->addr,client->flags, | |
1338 | I2C_SMBUS_WRITE,command, | |
1339 | I2C_SMBUS_WORD_DATA,&data); | |
1340 | } | |
c0564606 | 1341 | EXPORT_SYMBOL(i2c_smbus_write_word_data); |
1da177e4 | 1342 | |
a64ec07d DB |
1343 | /** |
1344 | * i2c_smbus_read_block_data - SMBus block read request | |
1345 | * @client: Handle to slave device | |
1346 | * @command: Command byte issued to let the slave know what data should | |
1347 | * be returned | |
1348 | * @values: Byte array into which data will be read; big enough to hold | |
1349 | * the data returned by the slave. SMBus allows at most 32 bytes. | |
1350 | * | |
1351 | * Returns the number of bytes read in the slave's response, else a | |
1352 | * negative number to indicate some kind of error. | |
1353 | * | |
1354 | * Note that using this function requires that the client's adapter support | |
1355 | * the I2C_FUNC_SMBUS_READ_BLOCK_DATA functionality. Not all adapter drivers | |
1356 | * support this; its emulation through I2C messaging relies on a specific | |
1357 | * mechanism (I2C_M_RECV_LEN) which may not be implemented. | |
1358 | */ | |
b86a1bc8 JD |
1359 | s32 i2c_smbus_read_block_data(struct i2c_client *client, u8 command, |
1360 | u8 *values) | |
1361 | { | |
1362 | union i2c_smbus_data data; | |
1363 | ||
1364 | if (i2c_smbus_xfer(client->adapter, client->addr, client->flags, | |
1365 | I2C_SMBUS_READ, command, | |
1366 | I2C_SMBUS_BLOCK_DATA, &data)) | |
1367 | return -1; | |
1368 | ||
1369 | memcpy(values, &data.block[1], data.block[0]); | |
1370 | return data.block[0]; | |
1371 | } | |
1372 | EXPORT_SYMBOL(i2c_smbus_read_block_data); | |
1373 | ||
1da177e4 | 1374 | s32 i2c_smbus_write_block_data(struct i2c_client *client, u8 command, |
46f5ed75 | 1375 | u8 length, const u8 *values) |
1da177e4 LT |
1376 | { |
1377 | union i2c_smbus_data data; | |
7656032b | 1378 | |
1da177e4 LT |
1379 | if (length > I2C_SMBUS_BLOCK_MAX) |
1380 | length = I2C_SMBUS_BLOCK_MAX; | |
1da177e4 | 1381 | data.block[0] = length; |
7656032b | 1382 | memcpy(&data.block[1], values, length); |
1da177e4 LT |
1383 | return i2c_smbus_xfer(client->adapter,client->addr,client->flags, |
1384 | I2C_SMBUS_WRITE,command, | |
1385 | I2C_SMBUS_BLOCK_DATA,&data); | |
1386 | } | |
c0564606 | 1387 | EXPORT_SYMBOL(i2c_smbus_write_block_data); |
1da177e4 LT |
1388 | |
1389 | /* Returns the number of read bytes */ | |
4b2643d7 JD |
1390 | s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client, u8 command, |
1391 | u8 length, u8 *values) | |
1da177e4 LT |
1392 | { |
1393 | union i2c_smbus_data data; | |
7656032b | 1394 | |
4b2643d7 JD |
1395 | if (length > I2C_SMBUS_BLOCK_MAX) |
1396 | length = I2C_SMBUS_BLOCK_MAX; | |
1397 | data.block[0] = length; | |
1da177e4 LT |
1398 | if (i2c_smbus_xfer(client->adapter,client->addr,client->flags, |
1399 | I2C_SMBUS_READ,command, | |
1400 | I2C_SMBUS_I2C_BLOCK_DATA,&data)) | |
1401 | return -1; | |
7656032b JD |
1402 | |
1403 | memcpy(values, &data.block[1], data.block[0]); | |
1404 | return data.block[0]; | |
1da177e4 | 1405 | } |
c0564606 | 1406 | EXPORT_SYMBOL(i2c_smbus_read_i2c_block_data); |
1da177e4 | 1407 | |
21bbd691 | 1408 | s32 i2c_smbus_write_i2c_block_data(struct i2c_client *client, u8 command, |
46f5ed75 | 1409 | u8 length, const u8 *values) |
21bbd691 JD |
1410 | { |
1411 | union i2c_smbus_data data; | |
1412 | ||
1413 | if (length > I2C_SMBUS_BLOCK_MAX) | |
1414 | length = I2C_SMBUS_BLOCK_MAX; | |
1415 | data.block[0] = length; | |
1416 | memcpy(data.block + 1, values, length); | |
1417 | return i2c_smbus_xfer(client->adapter, client->addr, client->flags, | |
1418 | I2C_SMBUS_WRITE, command, | |
1419 | I2C_SMBUS_I2C_BLOCK_DATA, &data); | |
1420 | } | |
c0564606 | 1421 | EXPORT_SYMBOL(i2c_smbus_write_i2c_block_data); |
21bbd691 | 1422 | |
438d6c2c | 1423 | /* Simulate a SMBus command using the i2c protocol |
1da177e4 | 1424 | No checking of parameters is done! */ |
438d6c2c | 1425 | static s32 i2c_smbus_xfer_emulated(struct i2c_adapter * adapter, u16 addr, |
1da177e4 | 1426 | unsigned short flags, |
438d6c2c | 1427 | char read_write, u8 command, int size, |
1da177e4 LT |
1428 | union i2c_smbus_data * data) |
1429 | { | |
1430 | /* So we need to generate a series of msgs. In the case of writing, we | |
1431 | need to use only one message; when reading, we need two. We initialize | |
1432 | most things with sane defaults, to keep the code below somewhat | |
1433 | simpler. */ | |
5c50d188 HI |
1434 | unsigned char msgbuf0[I2C_SMBUS_BLOCK_MAX+3]; |
1435 | unsigned char msgbuf1[I2C_SMBUS_BLOCK_MAX+2]; | |
1da177e4 | 1436 | int num = read_write == I2C_SMBUS_READ?2:1; |
438d6c2c | 1437 | struct i2c_msg msg[2] = { { addr, flags, 1, msgbuf0 }, |
1da177e4 LT |
1438 | { addr, flags | I2C_M_RD, 0, msgbuf1 } |
1439 | }; | |
1440 | int i; | |
421ef47b | 1441 | u8 partial_pec = 0; |
1da177e4 LT |
1442 | |
1443 | msgbuf0[0] = command; | |
1444 | switch(size) { | |
1445 | case I2C_SMBUS_QUICK: | |
1446 | msg[0].len = 0; | |
1447 | /* Special case: The read/write field is used as data */ | |
1448 | msg[0].flags = flags | (read_write==I2C_SMBUS_READ)?I2C_M_RD:0; | |
1449 | num = 1; | |
1450 | break; | |
1451 | case I2C_SMBUS_BYTE: | |
1452 | if (read_write == I2C_SMBUS_READ) { | |
1453 | /* Special case: only a read! */ | |
1454 | msg[0].flags = I2C_M_RD | flags; | |
1455 | num = 1; | |
1456 | } | |
1457 | break; | |
1458 | case I2C_SMBUS_BYTE_DATA: | |
1459 | if (read_write == I2C_SMBUS_READ) | |
1460 | msg[1].len = 1; | |
1461 | else { | |
1462 | msg[0].len = 2; | |
1463 | msgbuf0[1] = data->byte; | |
1464 | } | |
1465 | break; | |
1466 | case I2C_SMBUS_WORD_DATA: | |
1467 | if (read_write == I2C_SMBUS_READ) | |
1468 | msg[1].len = 2; | |
1469 | else { | |
1470 | msg[0].len=3; | |
1471 | msgbuf0[1] = data->word & 0xff; | |
7eff82c8 | 1472 | msgbuf0[2] = data->word >> 8; |
1da177e4 LT |
1473 | } |
1474 | break; | |
1475 | case I2C_SMBUS_PROC_CALL: | |
1476 | num = 2; /* Special case */ | |
1477 | read_write = I2C_SMBUS_READ; | |
1478 | msg[0].len = 3; | |
1479 | msg[1].len = 2; | |
1480 | msgbuf0[1] = data->word & 0xff; | |
7eff82c8 | 1481 | msgbuf0[2] = data->word >> 8; |
1da177e4 LT |
1482 | break; |
1483 | case I2C_SMBUS_BLOCK_DATA: | |
1da177e4 | 1484 | if (read_write == I2C_SMBUS_READ) { |
209d27c3 JD |
1485 | msg[1].flags |= I2C_M_RECV_LEN; |
1486 | msg[1].len = 1; /* block length will be added by | |
1487 | the underlying bus driver */ | |
1da177e4 LT |
1488 | } else { |
1489 | msg[0].len = data->block[0] + 2; | |
1490 | if (msg[0].len > I2C_SMBUS_BLOCK_MAX + 2) { | |
1491 | dev_err(&adapter->dev, "smbus_access called with " | |
1492 | "invalid block write size (%d)\n", | |
1493 | data->block[0]); | |
1494 | return -1; | |
1495 | } | |
5c50d188 | 1496 | for (i = 1; i < msg[0].len; i++) |
1da177e4 LT |
1497 | msgbuf0[i] = data->block[i-1]; |
1498 | } | |
1499 | break; | |
1500 | case I2C_SMBUS_BLOCK_PROC_CALL: | |
209d27c3 JD |
1501 | num = 2; /* Another special case */ |
1502 | read_write = I2C_SMBUS_READ; | |
1503 | if (data->block[0] > I2C_SMBUS_BLOCK_MAX) { | |
1504 | dev_err(&adapter->dev, "%s called with invalid " | |
1505 | "block proc call size (%d)\n", __FUNCTION__, | |
1506 | data->block[0]); | |
1507 | return -1; | |
1508 | } | |
1509 | msg[0].len = data->block[0] + 2; | |
1510 | for (i = 1; i < msg[0].len; i++) | |
1511 | msgbuf0[i] = data->block[i-1]; | |
1512 | msg[1].flags |= I2C_M_RECV_LEN; | |
1513 | msg[1].len = 1; /* block length will be added by | |
1514 | the underlying bus driver */ | |
1515 | break; | |
1da177e4 LT |
1516 | case I2C_SMBUS_I2C_BLOCK_DATA: |
1517 | if (read_write == I2C_SMBUS_READ) { | |
4b2643d7 | 1518 | msg[1].len = data->block[0]; |
1da177e4 LT |
1519 | } else { |
1520 | msg[0].len = data->block[0] + 1; | |
30dac746 | 1521 | if (msg[0].len > I2C_SMBUS_BLOCK_MAX + 1) { |
1da177e4 LT |
1522 | dev_err(&adapter->dev, "i2c_smbus_xfer_emulated called with " |
1523 | "invalid block write size (%d)\n", | |
1524 | data->block[0]); | |
1525 | return -1; | |
1526 | } | |
1527 | for (i = 1; i <= data->block[0]; i++) | |
1528 | msgbuf0[i] = data->block[i]; | |
1529 | } | |
1530 | break; | |
1531 | default: | |
1532 | dev_err(&adapter->dev, "smbus_access called with invalid size (%d)\n", | |
1533 | size); | |
1534 | return -1; | |
1535 | } | |
1536 | ||
421ef47b JD |
1537 | i = ((flags & I2C_CLIENT_PEC) && size != I2C_SMBUS_QUICK |
1538 | && size != I2C_SMBUS_I2C_BLOCK_DATA); | |
1539 | if (i) { | |
1540 | /* Compute PEC if first message is a write */ | |
1541 | if (!(msg[0].flags & I2C_M_RD)) { | |
438d6c2c | 1542 | if (num == 1) /* Write only */ |
421ef47b JD |
1543 | i2c_smbus_add_pec(&msg[0]); |
1544 | else /* Write followed by read */ | |
1545 | partial_pec = i2c_smbus_msg_pec(0, &msg[0]); | |
1546 | } | |
1547 | /* Ask for PEC if last message is a read */ | |
1548 | if (msg[num-1].flags & I2C_M_RD) | |
438d6c2c | 1549 | msg[num-1].len++; |
421ef47b JD |
1550 | } |
1551 | ||
1da177e4 LT |
1552 | if (i2c_transfer(adapter, msg, num) < 0) |
1553 | return -1; | |
1554 | ||
421ef47b JD |
1555 | /* Check PEC if last message is a read */ |
1556 | if (i && (msg[num-1].flags & I2C_M_RD)) { | |
1557 | if (i2c_smbus_check_pec(partial_pec, &msg[num-1]) < 0) | |
1558 | return -1; | |
1559 | } | |
1560 | ||
1da177e4 LT |
1561 | if (read_write == I2C_SMBUS_READ) |
1562 | switch(size) { | |
1563 | case I2C_SMBUS_BYTE: | |
1564 | data->byte = msgbuf0[0]; | |
1565 | break; | |
1566 | case I2C_SMBUS_BYTE_DATA: | |
1567 | data->byte = msgbuf1[0]; | |
1568 | break; | |
438d6c2c | 1569 | case I2C_SMBUS_WORD_DATA: |
1da177e4 LT |
1570 | case I2C_SMBUS_PROC_CALL: |
1571 | data->word = msgbuf1[0] | (msgbuf1[1] << 8); | |
1572 | break; | |
1573 | case I2C_SMBUS_I2C_BLOCK_DATA: | |
4b2643d7 | 1574 | for (i = 0; i < data->block[0]; i++) |
1da177e4 LT |
1575 | data->block[i+1] = msgbuf1[i]; |
1576 | break; | |
209d27c3 JD |
1577 | case I2C_SMBUS_BLOCK_DATA: |
1578 | case I2C_SMBUS_BLOCK_PROC_CALL: | |
1579 | for (i = 0; i < msgbuf1[0] + 1; i++) | |
1580 | data->block[i] = msgbuf1[i]; | |
1581 | break; | |
1da177e4 LT |
1582 | } |
1583 | return 0; | |
1584 | } | |
1585 | ||
1586 | ||
1587 | s32 i2c_smbus_xfer(struct i2c_adapter * adapter, u16 addr, unsigned short flags, | |
438d6c2c | 1588 | char read_write, u8 command, int size, |
1da177e4 LT |
1589 | union i2c_smbus_data * data) |
1590 | { | |
1591 | s32 res; | |
1da177e4 LT |
1592 | |
1593 | flags &= I2C_M_TEN | I2C_CLIENT_PEC; | |
1da177e4 LT |
1594 | |
1595 | if (adapter->algo->smbus_xfer) { | |
5c085d36 | 1596 | mutex_lock(&adapter->bus_lock); |
1da177e4 LT |
1597 | res = adapter->algo->smbus_xfer(adapter,addr,flags,read_write, |
1598 | command,size,data); | |
5c085d36 | 1599 | mutex_unlock(&adapter->bus_lock); |
1da177e4 LT |
1600 | } else |
1601 | res = i2c_smbus_xfer_emulated(adapter,addr,flags,read_write, | |
1602 | command,size,data); | |
1603 | ||
1da177e4 LT |
1604 | return res; |
1605 | } | |
1da177e4 | 1606 | EXPORT_SYMBOL(i2c_smbus_xfer); |
1da177e4 LT |
1607 | |
1608 | MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>"); | |
1609 | MODULE_DESCRIPTION("I2C-Bus main module"); | |
1610 | MODULE_LICENSE("GPL"); |