Commit | Line | Data |
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e27d75d7 JC |
1 | /* The industrial I/O core in kernel channel mapping |
2 | * | |
3 | * Copyright (c) 2011 Jonathan Cameron | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | */ | |
9 | #include <linux/err.h> | |
10 | #include <linux/export.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/mutex.h> | |
17d82b47 | 13 | #include <linux/of.h> |
e27d75d7 | 14 | |
06458e27 | 15 | #include <linux/iio/iio.h> |
e27d75d7 | 16 | #include "iio_core.h" |
06458e27 JC |
17 | #include <linux/iio/machine.h> |
18 | #include <linux/iio/driver.h> | |
19 | #include <linux/iio/consumer.h> | |
e27d75d7 JC |
20 | |
21 | struct iio_map_internal { | |
22 | struct iio_dev *indio_dev; | |
23 | struct iio_map *map; | |
24 | struct list_head l; | |
25 | }; | |
26 | ||
27 | static LIST_HEAD(iio_map_list); | |
28 | static DEFINE_MUTEX(iio_map_list_lock); | |
29 | ||
30 | int iio_map_array_register(struct iio_dev *indio_dev, struct iio_map *maps) | |
31 | { | |
32 | int i = 0, ret = 0; | |
33 | struct iio_map_internal *mapi; | |
34 | ||
35 | if (maps == NULL) | |
36 | return 0; | |
37 | ||
38 | mutex_lock(&iio_map_list_lock); | |
39 | while (maps[i].consumer_dev_name != NULL) { | |
40 | mapi = kzalloc(sizeof(*mapi), GFP_KERNEL); | |
41 | if (mapi == NULL) { | |
42 | ret = -ENOMEM; | |
43 | goto error_ret; | |
44 | } | |
45 | mapi->map = &maps[i]; | |
46 | mapi->indio_dev = indio_dev; | |
47 | list_add(&mapi->l, &iio_map_list); | |
48 | i++; | |
49 | } | |
50 | error_ret: | |
51 | mutex_unlock(&iio_map_list_lock); | |
52 | ||
53 | return ret; | |
54 | } | |
55 | EXPORT_SYMBOL_GPL(iio_map_array_register); | |
56 | ||
57 | ||
6cb2afd7 GR |
58 | /* |
59 | * Remove all map entries associated with the given iio device | |
e27d75d7 | 60 | */ |
6cb2afd7 | 61 | int iio_map_array_unregister(struct iio_dev *indio_dev) |
e27d75d7 | 62 | { |
6cb2afd7 | 63 | int ret = -ENODEV; |
e27d75d7 | 64 | struct iio_map_internal *mapi; |
6cb2afd7 | 65 | struct list_head *pos, *tmp; |
e27d75d7 JC |
66 | |
67 | mutex_lock(&iio_map_list_lock); | |
6cb2afd7 GR |
68 | list_for_each_safe(pos, tmp, &iio_map_list) { |
69 | mapi = list_entry(pos, struct iio_map_internal, l); | |
70 | if (indio_dev == mapi->indio_dev) { | |
71 | list_del(&mapi->l); | |
72 | kfree(mapi); | |
73 | ret = 0; | |
e27d75d7 JC |
74 | } |
75 | } | |
e27d75d7 | 76 | mutex_unlock(&iio_map_list_lock); |
e27d75d7 JC |
77 | return ret; |
78 | } | |
79 | EXPORT_SYMBOL_GPL(iio_map_array_unregister); | |
80 | ||
81 | static const struct iio_chan_spec | |
314be14b | 82 | *iio_chan_spec_from_name(const struct iio_dev *indio_dev, const char *name) |
e27d75d7 JC |
83 | { |
84 | int i; | |
85 | const struct iio_chan_spec *chan = NULL; | |
86 | ||
87 | for (i = 0; i < indio_dev->num_channels; i++) | |
88 | if (indio_dev->channels[i].datasheet_name && | |
89 | strcmp(name, indio_dev->channels[i].datasheet_name) == 0) { | |
90 | chan = &indio_dev->channels[i]; | |
91 | break; | |
92 | } | |
93 | return chan; | |
94 | } | |
95 | ||
17d82b47 GR |
96 | #ifdef CONFIG_OF |
97 | ||
98 | static int iio_dev_node_match(struct device *dev, void *data) | |
99 | { | |
100 | return dev->of_node == data && dev->type == &iio_device_type; | |
101 | } | |
102 | ||
acd82567 II |
103 | /** |
104 | * __of_iio_simple_xlate - translate iiospec to the IIO channel index | |
105 | * @indio_dev: pointer to the iio_dev structure | |
106 | * @iiospec: IIO specifier as found in the device tree | |
107 | * | |
108 | * This is simple translation function, suitable for the most 1:1 mapped | |
109 | * channels in IIO chips. This function performs only one sanity check: | |
110 | * whether IIO index is less than num_channels (that is specified in the | |
111 | * iio_dev). | |
112 | */ | |
113 | static int __of_iio_simple_xlate(struct iio_dev *indio_dev, | |
114 | const struct of_phandle_args *iiospec) | |
115 | { | |
116 | if (!iiospec->args_count) | |
117 | return 0; | |
118 | ||
1f202725 SW |
119 | if (iiospec->args[0] >= indio_dev->num_channels) { |
120 | dev_err(&indio_dev->dev, "invalid channel index %u\n", | |
121 | iiospec->args[0]); | |
acd82567 | 122 | return -EINVAL; |
1f202725 | 123 | } |
acd82567 II |
124 | |
125 | return iiospec->args[0]; | |
126 | } | |
127 | ||
17d82b47 GR |
128 | static int __of_iio_channel_get(struct iio_channel *channel, |
129 | struct device_node *np, int index) | |
130 | { | |
131 | struct device *idev; | |
132 | struct iio_dev *indio_dev; | |
133 | int err; | |
134 | struct of_phandle_args iiospec; | |
135 | ||
136 | err = of_parse_phandle_with_args(np, "io-channels", | |
137 | "#io-channel-cells", | |
138 | index, &iiospec); | |
139 | if (err) | |
140 | return err; | |
141 | ||
142 | idev = bus_find_device(&iio_bus_type, NULL, iiospec.np, | |
143 | iio_dev_node_match); | |
144 | of_node_put(iiospec.np); | |
145 | if (idev == NULL) | |
146 | return -EPROBE_DEFER; | |
147 | ||
148 | indio_dev = dev_to_iio_dev(idev); | |
149 | channel->indio_dev = indio_dev; | |
acd82567 II |
150 | if (indio_dev->info->of_xlate) |
151 | index = indio_dev->info->of_xlate(indio_dev, &iiospec); | |
152 | else | |
153 | index = __of_iio_simple_xlate(indio_dev, &iiospec); | |
154 | if (index < 0) | |
17d82b47 | 155 | goto err_put; |
17d82b47 GR |
156 | channel->channel = &indio_dev->channels[index]; |
157 | ||
158 | return 0; | |
159 | ||
160 | err_put: | |
161 | iio_device_put(indio_dev); | |
acd82567 | 162 | return index; |
17d82b47 GR |
163 | } |
164 | ||
165 | static struct iio_channel *of_iio_channel_get(struct device_node *np, int index) | |
166 | { | |
167 | struct iio_channel *channel; | |
168 | int err; | |
169 | ||
170 | if (index < 0) | |
171 | return ERR_PTR(-EINVAL); | |
172 | ||
173 | channel = kzalloc(sizeof(*channel), GFP_KERNEL); | |
174 | if (channel == NULL) | |
175 | return ERR_PTR(-ENOMEM); | |
176 | ||
177 | err = __of_iio_channel_get(channel, np, index); | |
178 | if (err) | |
179 | goto err_free_channel; | |
180 | ||
181 | return channel; | |
182 | ||
183 | err_free_channel: | |
184 | kfree(channel); | |
185 | return ERR_PTR(err); | |
186 | } | |
187 | ||
188 | static struct iio_channel *of_iio_channel_get_by_name(struct device_node *np, | |
189 | const char *name) | |
190 | { | |
191 | struct iio_channel *chan = NULL; | |
192 | ||
193 | /* Walk up the tree of devices looking for a matching iio channel */ | |
194 | while (np) { | |
195 | int index = 0; | |
196 | ||
197 | /* | |
198 | * For named iio channels, first look up the name in the | |
199 | * "io-channel-names" property. If it cannot be found, the | |
200 | * index will be an error code, and of_iio_channel_get() | |
201 | * will fail. | |
202 | */ | |
203 | if (name) | |
204 | index = of_property_match_string(np, "io-channel-names", | |
205 | name); | |
206 | chan = of_iio_channel_get(np, index); | |
872687f6 | 207 | if (!IS_ERR(chan) || PTR_ERR(chan) == -EPROBE_DEFER) |
17d82b47 GR |
208 | break; |
209 | else if (name && index >= 0) { | |
210 | pr_err("ERROR: could not get IIO channel %s:%s(%i)\n", | |
211 | np->full_name, name ? name : "", index); | |
a2c12493 | 212 | return NULL; |
17d82b47 GR |
213 | } |
214 | ||
215 | /* | |
216 | * No matching IIO channel found on this node. | |
217 | * If the parent node has a "io-channel-ranges" property, | |
218 | * then we can try one of its channels. | |
219 | */ | |
220 | np = np->parent; | |
221 | if (np && !of_get_property(np, "io-channel-ranges", NULL)) | |
a2c12493 | 222 | return NULL; |
17d82b47 | 223 | } |
a2c12493 | 224 | |
17d82b47 GR |
225 | return chan; |
226 | } | |
227 | ||
228 | static struct iio_channel *of_iio_channel_get_all(struct device *dev) | |
229 | { | |
230 | struct iio_channel *chans; | |
231 | int i, mapind, nummaps = 0; | |
232 | int ret; | |
233 | ||
234 | do { | |
235 | ret = of_parse_phandle_with_args(dev->of_node, | |
236 | "io-channels", | |
237 | "#io-channel-cells", | |
238 | nummaps, NULL); | |
239 | if (ret < 0) | |
240 | break; | |
241 | } while (++nummaps); | |
242 | ||
243 | if (nummaps == 0) /* no error, return NULL to search map table */ | |
244 | return NULL; | |
245 | ||
246 | /* NULL terminated array to save passing size */ | |
247 | chans = kcalloc(nummaps + 1, sizeof(*chans), GFP_KERNEL); | |
248 | if (chans == NULL) | |
249 | return ERR_PTR(-ENOMEM); | |
250 | ||
251 | /* Search for OF matches */ | |
252 | for (mapind = 0; mapind < nummaps; mapind++) { | |
253 | ret = __of_iio_channel_get(&chans[mapind], dev->of_node, | |
254 | mapind); | |
255 | if (ret) | |
256 | goto error_free_chans; | |
257 | } | |
258 | return chans; | |
259 | ||
260 | error_free_chans: | |
261 | for (i = 0; i < mapind; i++) | |
262 | iio_device_put(chans[i].indio_dev); | |
263 | kfree(chans); | |
264 | return ERR_PTR(ret); | |
265 | } | |
266 | ||
267 | #else /* CONFIG_OF */ | |
268 | ||
269 | static inline struct iio_channel * | |
270 | of_iio_channel_get_by_name(struct device_node *np, const char *name) | |
271 | { | |
272 | return NULL; | |
273 | } | |
274 | ||
275 | static inline struct iio_channel *of_iio_channel_get_all(struct device *dev) | |
276 | { | |
277 | return NULL; | |
278 | } | |
279 | ||
280 | #endif /* CONFIG_OF */ | |
e27d75d7 | 281 | |
5aa57f0a GR |
282 | static struct iio_channel *iio_channel_get_sys(const char *name, |
283 | const char *channel_name) | |
e27d75d7 JC |
284 | { |
285 | struct iio_map_internal *c_i = NULL, *c = NULL; | |
286 | struct iio_channel *channel; | |
3183bac1 | 287 | int err; |
e27d75d7 JC |
288 | |
289 | if (name == NULL && channel_name == NULL) | |
290 | return ERR_PTR(-ENODEV); | |
291 | ||
292 | /* first find matching entry the channel map */ | |
293 | mutex_lock(&iio_map_list_lock); | |
294 | list_for_each_entry(c_i, &iio_map_list, l) { | |
295 | if ((name && strcmp(name, c_i->map->consumer_dev_name) != 0) || | |
296 | (channel_name && | |
297 | strcmp(channel_name, c_i->map->consumer_channel) != 0)) | |
298 | continue; | |
299 | c = c_i; | |
1875ffd2 | 300 | iio_device_get(c->indio_dev); |
e27d75d7 JC |
301 | break; |
302 | } | |
303 | mutex_unlock(&iio_map_list_lock); | |
304 | if (c == NULL) | |
305 | return ERR_PTR(-ENODEV); | |
306 | ||
2cc412b5 | 307 | channel = kzalloc(sizeof(*channel), GFP_KERNEL); |
3183bac1 KM |
308 | if (channel == NULL) { |
309 | err = -ENOMEM; | |
801c4b5c | 310 | goto error_no_mem; |
3183bac1 | 311 | } |
e27d75d7 JC |
312 | |
313 | channel->indio_dev = c->indio_dev; | |
314 | ||
b2b79ffa | 315 | if (c->map->adc_channel_label) { |
e27d75d7 JC |
316 | channel->channel = |
317 | iio_chan_spec_from_name(channel->indio_dev, | |
318 | c->map->adc_channel_label); | |
319 | ||
3183bac1 KM |
320 | if (channel->channel == NULL) { |
321 | err = -EINVAL; | |
b2b79ffa | 322 | goto error_no_chan; |
3183bac1 | 323 | } |
b2b79ffa KM |
324 | } |
325 | ||
e27d75d7 | 326 | return channel; |
b2b79ffa KM |
327 | |
328 | error_no_chan: | |
b2b79ffa | 329 | kfree(channel); |
801c4b5c KM |
330 | error_no_mem: |
331 | iio_device_put(c->indio_dev); | |
3183bac1 | 332 | return ERR_PTR(err); |
e27d75d7 | 333 | } |
5aa57f0a GR |
334 | |
335 | struct iio_channel *iio_channel_get(struct device *dev, | |
336 | const char *channel_name) | |
337 | { | |
338 | const char *name = dev ? dev_name(dev) : NULL; | |
17d82b47 | 339 | struct iio_channel *channel; |
5aa57f0a | 340 | |
17d82b47 GR |
341 | if (dev) { |
342 | channel = of_iio_channel_get_by_name(dev->of_node, | |
343 | channel_name); | |
344 | if (channel != NULL) | |
345 | return channel; | |
346 | } | |
a2c12493 | 347 | |
5aa57f0a GR |
348 | return iio_channel_get_sys(name, channel_name); |
349 | } | |
314be14b | 350 | EXPORT_SYMBOL_GPL(iio_channel_get); |
e27d75d7 | 351 | |
314be14b | 352 | void iio_channel_release(struct iio_channel *channel) |
e27d75d7 | 353 | { |
1875ffd2 | 354 | iio_device_put(channel->indio_dev); |
e27d75d7 JC |
355 | kfree(channel); |
356 | } | |
314be14b | 357 | EXPORT_SYMBOL_GPL(iio_channel_release); |
e27d75d7 | 358 | |
ca7d98db | 359 | struct iio_channel *iio_channel_get_all(struct device *dev) |
e27d75d7 | 360 | { |
ca7d98db | 361 | const char *name; |
e27d75d7 JC |
362 | struct iio_channel *chans; |
363 | struct iio_map_internal *c = NULL; | |
364 | int nummaps = 0; | |
365 | int mapind = 0; | |
366 | int i, ret; | |
367 | ||
ca7d98db | 368 | if (dev == NULL) |
e27d75d7 | 369 | return ERR_PTR(-EINVAL); |
17d82b47 GR |
370 | |
371 | chans = of_iio_channel_get_all(dev); | |
372 | if (chans) | |
373 | return chans; | |
374 | ||
ca7d98db | 375 | name = dev_name(dev); |
e27d75d7 JC |
376 | |
377 | mutex_lock(&iio_map_list_lock); | |
378 | /* first count the matching maps */ | |
379 | list_for_each_entry(c, &iio_map_list, l) | |
380 | if (name && strcmp(name, c->map->consumer_dev_name) != 0) | |
381 | continue; | |
382 | else | |
383 | nummaps++; | |
384 | ||
385 | if (nummaps == 0) { | |
386 | ret = -ENODEV; | |
387 | goto error_ret; | |
388 | } | |
389 | ||
390 | /* NULL terminated array to save passing size */ | |
391 | chans = kzalloc(sizeof(*chans)*(nummaps + 1), GFP_KERNEL); | |
392 | if (chans == NULL) { | |
393 | ret = -ENOMEM; | |
394 | goto error_ret; | |
395 | } | |
396 | ||
397 | /* for each map fill in the chans element */ | |
398 | list_for_each_entry(c, &iio_map_list, l) { | |
399 | if (name && strcmp(name, c->map->consumer_dev_name) != 0) | |
400 | continue; | |
401 | chans[mapind].indio_dev = c->indio_dev; | |
0464415d | 402 | chans[mapind].data = c->map->consumer_data; |
e27d75d7 JC |
403 | chans[mapind].channel = |
404 | iio_chan_spec_from_name(chans[mapind].indio_dev, | |
405 | c->map->adc_channel_label); | |
406 | if (chans[mapind].channel == NULL) { | |
407 | ret = -EINVAL; | |
e27d75d7 JC |
408 | goto error_free_chans; |
409 | } | |
1875ffd2 | 410 | iio_device_get(chans[mapind].indio_dev); |
e27d75d7 JC |
411 | mapind++; |
412 | } | |
e27d75d7 JC |
413 | if (mapind == 0) { |
414 | ret = -ENODEV; | |
415 | goto error_free_chans; | |
416 | } | |
e59b9afe DC |
417 | mutex_unlock(&iio_map_list_lock); |
418 | ||
e27d75d7 JC |
419 | return chans; |
420 | ||
421 | error_free_chans: | |
422 | for (i = 0; i < nummaps; i++) | |
1875ffd2 | 423 | iio_device_put(chans[i].indio_dev); |
e27d75d7 JC |
424 | kfree(chans); |
425 | error_ret: | |
426 | mutex_unlock(&iio_map_list_lock); | |
427 | ||
428 | return ERR_PTR(ret); | |
429 | } | |
314be14b | 430 | EXPORT_SYMBOL_GPL(iio_channel_get_all); |
e27d75d7 | 431 | |
314be14b | 432 | void iio_channel_release_all(struct iio_channel *channels) |
e27d75d7 JC |
433 | { |
434 | struct iio_channel *chan = &channels[0]; | |
435 | ||
436 | while (chan->indio_dev) { | |
1875ffd2 | 437 | iio_device_put(chan->indio_dev); |
e27d75d7 JC |
438 | chan++; |
439 | } | |
440 | kfree(channels); | |
441 | } | |
314be14b | 442 | EXPORT_SYMBOL_GPL(iio_channel_release_all); |
e27d75d7 | 443 | |
48e44ce0 LPC |
444 | static int iio_channel_read(struct iio_channel *chan, int *val, int *val2, |
445 | enum iio_chan_info_enum info) | |
446 | { | |
447 | int unused; | |
9fbfb4b3 SP |
448 | int vals[INDIO_MAX_RAW_ELEMENTS]; |
449 | int ret; | |
450 | int val_len = 2; | |
48e44ce0 LPC |
451 | |
452 | if (val2 == NULL) | |
453 | val2 = &unused; | |
454 | ||
65de7654 FP |
455 | if(!iio_channel_has_info(chan->channel, info)) |
456 | return -EINVAL; | |
457 | ||
9fbfb4b3 SP |
458 | if (chan->indio_dev->info->read_raw_multi) { |
459 | ret = chan->indio_dev->info->read_raw_multi(chan->indio_dev, | |
460 | chan->channel, INDIO_MAX_RAW_ELEMENTS, | |
461 | vals, &val_len, info); | |
462 | *val = vals[0]; | |
463 | *val2 = vals[1]; | |
464 | } else | |
465 | ret = chan->indio_dev->info->read_raw(chan->indio_dev, | |
466 | chan->channel, val, val2, info); | |
467 | ||
468 | return ret; | |
48e44ce0 LPC |
469 | } |
470 | ||
314be14b | 471 | int iio_read_channel_raw(struct iio_channel *chan, int *val) |
e27d75d7 | 472 | { |
48e44ce0 | 473 | int ret; |
e27d75d7 JC |
474 | |
475 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
476 | if (chan->indio_dev->info == NULL) { | |
477 | ret = -ENODEV; | |
478 | goto err_unlock; | |
479 | } | |
480 | ||
48e44ce0 | 481 | ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW); |
e27d75d7 JC |
482 | err_unlock: |
483 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
484 | ||
485 | return ret; | |
486 | } | |
314be14b | 487 | EXPORT_SYMBOL_GPL(iio_read_channel_raw); |
e27d75d7 | 488 | |
476d4af2 SR |
489 | int iio_read_channel_average_raw(struct iio_channel *chan, int *val) |
490 | { | |
491 | int ret; | |
492 | ||
493 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
494 | if (chan->indio_dev->info == NULL) { | |
495 | ret = -ENODEV; | |
496 | goto err_unlock; | |
497 | } | |
498 | ||
499 | ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_AVERAGE_RAW); | |
500 | err_unlock: | |
501 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
502 | ||
503 | return ret; | |
504 | } | |
505 | EXPORT_SYMBOL_GPL(iio_read_channel_average_raw); | |
506 | ||
48e44ce0 LPC |
507 | static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan, |
508 | int raw, int *processed, unsigned int scale) | |
509 | { | |
510 | int scale_type, scale_val, scale_val2, offset; | |
511 | s64 raw64 = raw; | |
512 | int ret; | |
513 | ||
6c5d4c96 | 514 | ret = iio_channel_read(chan, &offset, NULL, IIO_CHAN_INFO_OFFSET); |
f91d1b63 | 515 | if (ret >= 0) |
48e44ce0 LPC |
516 | raw64 += offset; |
517 | ||
518 | scale_type = iio_channel_read(chan, &scale_val, &scale_val2, | |
519 | IIO_CHAN_INFO_SCALE); | |
520 | if (scale_type < 0) | |
521 | return scale_type; | |
522 | ||
523 | switch (scale_type) { | |
524 | case IIO_VAL_INT: | |
525 | *processed = raw64 * scale_val; | |
526 | break; | |
527 | case IIO_VAL_INT_PLUS_MICRO: | |
528 | if (scale_val2 < 0) | |
529 | *processed = -raw64 * scale_val; | |
530 | else | |
531 | *processed = raw64 * scale_val; | |
532 | *processed += div_s64(raw64 * (s64)scale_val2 * scale, | |
533 | 1000000LL); | |
534 | break; | |
535 | case IIO_VAL_INT_PLUS_NANO: | |
536 | if (scale_val2 < 0) | |
537 | *processed = -raw64 * scale_val; | |
538 | else | |
539 | *processed = raw64 * scale_val; | |
540 | *processed += div_s64(raw64 * (s64)scale_val2 * scale, | |
541 | 1000000000LL); | |
542 | break; | |
543 | case IIO_VAL_FRACTIONAL: | |
544 | *processed = div_s64(raw64 * (s64)scale_val * scale, | |
545 | scale_val2); | |
546 | break; | |
103d9fb9 LPC |
547 | case IIO_VAL_FRACTIONAL_LOG2: |
548 | *processed = (raw64 * (s64)scale_val * scale) >> scale_val2; | |
549 | break; | |
48e44ce0 LPC |
550 | default: |
551 | return -EINVAL; | |
552 | } | |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
557 | int iio_convert_raw_to_processed(struct iio_channel *chan, int raw, | |
558 | int *processed, unsigned int scale) | |
559 | { | |
560 | int ret; | |
561 | ||
562 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
563 | if (chan->indio_dev->info == NULL) { | |
564 | ret = -ENODEV; | |
565 | goto err_unlock; | |
566 | } | |
567 | ||
568 | ret = iio_convert_raw_to_processed_unlocked(chan, raw, processed, | |
569 | scale); | |
570 | err_unlock: | |
571 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
572 | ||
573 | return ret; | |
574 | } | |
575 | EXPORT_SYMBOL_GPL(iio_convert_raw_to_processed); | |
576 | ||
577 | int iio_read_channel_processed(struct iio_channel *chan, int *val) | |
578 | { | |
579 | int ret; | |
580 | ||
581 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
582 | if (chan->indio_dev->info == NULL) { | |
583 | ret = -ENODEV; | |
584 | goto err_unlock; | |
585 | } | |
586 | ||
587 | if (iio_channel_has_info(chan->channel, IIO_CHAN_INFO_PROCESSED)) { | |
588 | ret = iio_channel_read(chan, val, NULL, | |
589 | IIO_CHAN_INFO_PROCESSED); | |
590 | } else { | |
591 | ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW); | |
592 | if (ret < 0) | |
593 | goto err_unlock; | |
594 | ret = iio_convert_raw_to_processed_unlocked(chan, *val, val, 1); | |
595 | } | |
596 | ||
597 | err_unlock: | |
598 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
599 | ||
600 | return ret; | |
601 | } | |
602 | EXPORT_SYMBOL_GPL(iio_read_channel_processed); | |
603 | ||
314be14b | 604 | int iio_read_channel_scale(struct iio_channel *chan, int *val, int *val2) |
e27d75d7 JC |
605 | { |
606 | int ret; | |
607 | ||
608 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
609 | if (chan->indio_dev->info == NULL) { | |
610 | ret = -ENODEV; | |
611 | goto err_unlock; | |
612 | } | |
613 | ||
48e44ce0 | 614 | ret = iio_channel_read(chan, val, val2, IIO_CHAN_INFO_SCALE); |
e27d75d7 JC |
615 | err_unlock: |
616 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
617 | ||
618 | return ret; | |
619 | } | |
314be14b | 620 | EXPORT_SYMBOL_GPL(iio_read_channel_scale); |
e27d75d7 | 621 | |
314be14b | 622 | int iio_get_channel_type(struct iio_channel *chan, enum iio_chan_type *type) |
e27d75d7 JC |
623 | { |
624 | int ret = 0; | |
625 | /* Need to verify underlying driver has not gone away */ | |
626 | ||
627 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
628 | if (chan->indio_dev->info == NULL) { | |
629 | ret = -ENODEV; | |
630 | goto err_unlock; | |
631 | } | |
632 | ||
633 | *type = chan->channel->type; | |
634 | err_unlock: | |
635 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
636 | ||
637 | return ret; | |
638 | } | |
314be14b | 639 | EXPORT_SYMBOL_GPL(iio_get_channel_type); |
f9380e71 DES |
640 | |
641 | static int iio_channel_write(struct iio_channel *chan, int val, int val2, | |
642 | enum iio_chan_info_enum info) | |
643 | { | |
644 | return chan->indio_dev->info->write_raw(chan->indio_dev, | |
645 | chan->channel, val, val2, info); | |
646 | } | |
647 | ||
648 | int iio_write_channel_raw(struct iio_channel *chan, int val) | |
649 | { | |
650 | int ret; | |
651 | ||
652 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
653 | if (chan->indio_dev->info == NULL) { | |
654 | ret = -ENODEV; | |
655 | goto err_unlock; | |
656 | } | |
657 | ||
658 | ret = iio_channel_write(chan, val, 0, IIO_CHAN_INFO_RAW); | |
659 | err_unlock: | |
660 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
661 | ||
662 | return ret; | |
663 | } | |
664 | EXPORT_SYMBOL_GPL(iio_write_channel_raw); |