Commit | Line | Data |
---|---|---|
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 | ||
119 | if (iiospec->args[0] >= indio_dev->num_channels) | |
120 | return -EINVAL; | |
121 | ||
122 | return iiospec->args[0]; | |
123 | } | |
124 | ||
17d82b47 GR |
125 | static int __of_iio_channel_get(struct iio_channel *channel, |
126 | struct device_node *np, int index) | |
127 | { | |
128 | struct device *idev; | |
129 | struct iio_dev *indio_dev; | |
130 | int err; | |
131 | struct of_phandle_args iiospec; | |
132 | ||
133 | err = of_parse_phandle_with_args(np, "io-channels", | |
134 | "#io-channel-cells", | |
135 | index, &iiospec); | |
136 | if (err) | |
137 | return err; | |
138 | ||
139 | idev = bus_find_device(&iio_bus_type, NULL, iiospec.np, | |
140 | iio_dev_node_match); | |
141 | of_node_put(iiospec.np); | |
142 | if (idev == NULL) | |
143 | return -EPROBE_DEFER; | |
144 | ||
145 | indio_dev = dev_to_iio_dev(idev); | |
146 | channel->indio_dev = indio_dev; | |
acd82567 II |
147 | if (indio_dev->info->of_xlate) |
148 | index = indio_dev->info->of_xlate(indio_dev, &iiospec); | |
149 | else | |
150 | index = __of_iio_simple_xlate(indio_dev, &iiospec); | |
151 | if (index < 0) | |
17d82b47 | 152 | goto err_put; |
17d82b47 GR |
153 | channel->channel = &indio_dev->channels[index]; |
154 | ||
155 | return 0; | |
156 | ||
157 | err_put: | |
158 | iio_device_put(indio_dev); | |
acd82567 | 159 | return index; |
17d82b47 GR |
160 | } |
161 | ||
162 | static struct iio_channel *of_iio_channel_get(struct device_node *np, int index) | |
163 | { | |
164 | struct iio_channel *channel; | |
165 | int err; | |
166 | ||
167 | if (index < 0) | |
168 | return ERR_PTR(-EINVAL); | |
169 | ||
170 | channel = kzalloc(sizeof(*channel), GFP_KERNEL); | |
171 | if (channel == NULL) | |
172 | return ERR_PTR(-ENOMEM); | |
173 | ||
174 | err = __of_iio_channel_get(channel, np, index); | |
175 | if (err) | |
176 | goto err_free_channel; | |
177 | ||
178 | return channel; | |
179 | ||
180 | err_free_channel: | |
181 | kfree(channel); | |
182 | return ERR_PTR(err); | |
183 | } | |
184 | ||
185 | static struct iio_channel *of_iio_channel_get_by_name(struct device_node *np, | |
186 | const char *name) | |
187 | { | |
188 | struct iio_channel *chan = NULL; | |
189 | ||
190 | /* Walk up the tree of devices looking for a matching iio channel */ | |
191 | while (np) { | |
192 | int index = 0; | |
193 | ||
194 | /* | |
195 | * For named iio channels, first look up the name in the | |
196 | * "io-channel-names" property. If it cannot be found, the | |
197 | * index will be an error code, and of_iio_channel_get() | |
198 | * will fail. | |
199 | */ | |
200 | if (name) | |
201 | index = of_property_match_string(np, "io-channel-names", | |
202 | name); | |
203 | chan = of_iio_channel_get(np, index); | |
872687f6 | 204 | if (!IS_ERR(chan) || PTR_ERR(chan) == -EPROBE_DEFER) |
17d82b47 GR |
205 | break; |
206 | else if (name && index >= 0) { | |
207 | pr_err("ERROR: could not get IIO channel %s:%s(%i)\n", | |
208 | np->full_name, name ? name : "", index); | |
a2c12493 | 209 | return NULL; |
17d82b47 GR |
210 | } |
211 | ||
212 | /* | |
213 | * No matching IIO channel found on this node. | |
214 | * If the parent node has a "io-channel-ranges" property, | |
215 | * then we can try one of its channels. | |
216 | */ | |
217 | np = np->parent; | |
218 | if (np && !of_get_property(np, "io-channel-ranges", NULL)) | |
a2c12493 | 219 | return NULL; |
17d82b47 | 220 | } |
a2c12493 | 221 | |
17d82b47 GR |
222 | return chan; |
223 | } | |
224 | ||
225 | static struct iio_channel *of_iio_channel_get_all(struct device *dev) | |
226 | { | |
227 | struct iio_channel *chans; | |
228 | int i, mapind, nummaps = 0; | |
229 | int ret; | |
230 | ||
231 | do { | |
232 | ret = of_parse_phandle_with_args(dev->of_node, | |
233 | "io-channels", | |
234 | "#io-channel-cells", | |
235 | nummaps, NULL); | |
236 | if (ret < 0) | |
237 | break; | |
238 | } while (++nummaps); | |
239 | ||
240 | if (nummaps == 0) /* no error, return NULL to search map table */ | |
241 | return NULL; | |
242 | ||
243 | /* NULL terminated array to save passing size */ | |
244 | chans = kcalloc(nummaps + 1, sizeof(*chans), GFP_KERNEL); | |
245 | if (chans == NULL) | |
246 | return ERR_PTR(-ENOMEM); | |
247 | ||
248 | /* Search for OF matches */ | |
249 | for (mapind = 0; mapind < nummaps; mapind++) { | |
250 | ret = __of_iio_channel_get(&chans[mapind], dev->of_node, | |
251 | mapind); | |
252 | if (ret) | |
253 | goto error_free_chans; | |
254 | } | |
255 | return chans; | |
256 | ||
257 | error_free_chans: | |
258 | for (i = 0; i < mapind; i++) | |
259 | iio_device_put(chans[i].indio_dev); | |
260 | kfree(chans); | |
261 | return ERR_PTR(ret); | |
262 | } | |
263 | ||
264 | #else /* CONFIG_OF */ | |
265 | ||
266 | static inline struct iio_channel * | |
267 | of_iio_channel_get_by_name(struct device_node *np, const char *name) | |
268 | { | |
269 | return NULL; | |
270 | } | |
271 | ||
272 | static inline struct iio_channel *of_iio_channel_get_all(struct device *dev) | |
273 | { | |
274 | return NULL; | |
275 | } | |
276 | ||
277 | #endif /* CONFIG_OF */ | |
e27d75d7 | 278 | |
5aa57f0a GR |
279 | static struct iio_channel *iio_channel_get_sys(const char *name, |
280 | const char *channel_name) | |
e27d75d7 JC |
281 | { |
282 | struct iio_map_internal *c_i = NULL, *c = NULL; | |
283 | struct iio_channel *channel; | |
3183bac1 | 284 | int err; |
e27d75d7 JC |
285 | |
286 | if (name == NULL && channel_name == NULL) | |
287 | return ERR_PTR(-ENODEV); | |
288 | ||
289 | /* first find matching entry the channel map */ | |
290 | mutex_lock(&iio_map_list_lock); | |
291 | list_for_each_entry(c_i, &iio_map_list, l) { | |
292 | if ((name && strcmp(name, c_i->map->consumer_dev_name) != 0) || | |
293 | (channel_name && | |
294 | strcmp(channel_name, c_i->map->consumer_channel) != 0)) | |
295 | continue; | |
296 | c = c_i; | |
1875ffd2 | 297 | iio_device_get(c->indio_dev); |
e27d75d7 JC |
298 | break; |
299 | } | |
300 | mutex_unlock(&iio_map_list_lock); | |
301 | if (c == NULL) | |
302 | return ERR_PTR(-ENODEV); | |
303 | ||
2cc412b5 | 304 | channel = kzalloc(sizeof(*channel), GFP_KERNEL); |
3183bac1 KM |
305 | if (channel == NULL) { |
306 | err = -ENOMEM; | |
801c4b5c | 307 | goto error_no_mem; |
3183bac1 | 308 | } |
e27d75d7 JC |
309 | |
310 | channel->indio_dev = c->indio_dev; | |
311 | ||
b2b79ffa | 312 | if (c->map->adc_channel_label) { |
e27d75d7 JC |
313 | channel->channel = |
314 | iio_chan_spec_from_name(channel->indio_dev, | |
315 | c->map->adc_channel_label); | |
316 | ||
3183bac1 KM |
317 | if (channel->channel == NULL) { |
318 | err = -EINVAL; | |
b2b79ffa | 319 | goto error_no_chan; |
3183bac1 | 320 | } |
b2b79ffa KM |
321 | } |
322 | ||
e27d75d7 | 323 | return channel; |
b2b79ffa KM |
324 | |
325 | error_no_chan: | |
b2b79ffa | 326 | kfree(channel); |
801c4b5c KM |
327 | error_no_mem: |
328 | iio_device_put(c->indio_dev); | |
3183bac1 | 329 | return ERR_PTR(err); |
e27d75d7 | 330 | } |
5aa57f0a GR |
331 | |
332 | struct iio_channel *iio_channel_get(struct device *dev, | |
333 | const char *channel_name) | |
334 | { | |
335 | const char *name = dev ? dev_name(dev) : NULL; | |
17d82b47 | 336 | struct iio_channel *channel; |
5aa57f0a | 337 | |
17d82b47 GR |
338 | if (dev) { |
339 | channel = of_iio_channel_get_by_name(dev->of_node, | |
340 | channel_name); | |
341 | if (channel != NULL) | |
342 | return channel; | |
343 | } | |
a2c12493 | 344 | |
5aa57f0a GR |
345 | return iio_channel_get_sys(name, channel_name); |
346 | } | |
314be14b | 347 | EXPORT_SYMBOL_GPL(iio_channel_get); |
e27d75d7 | 348 | |
314be14b | 349 | void iio_channel_release(struct iio_channel *channel) |
e27d75d7 | 350 | { |
1875ffd2 | 351 | iio_device_put(channel->indio_dev); |
e27d75d7 JC |
352 | kfree(channel); |
353 | } | |
314be14b | 354 | EXPORT_SYMBOL_GPL(iio_channel_release); |
e27d75d7 | 355 | |
ca7d98db | 356 | struct iio_channel *iio_channel_get_all(struct device *dev) |
e27d75d7 | 357 | { |
ca7d98db | 358 | const char *name; |
e27d75d7 JC |
359 | struct iio_channel *chans; |
360 | struct iio_map_internal *c = NULL; | |
361 | int nummaps = 0; | |
362 | int mapind = 0; | |
363 | int i, ret; | |
364 | ||
ca7d98db | 365 | if (dev == NULL) |
e27d75d7 | 366 | return ERR_PTR(-EINVAL); |
17d82b47 GR |
367 | |
368 | chans = of_iio_channel_get_all(dev); | |
369 | if (chans) | |
370 | return chans; | |
371 | ||
ca7d98db | 372 | name = dev_name(dev); |
e27d75d7 JC |
373 | |
374 | mutex_lock(&iio_map_list_lock); | |
375 | /* first count the matching maps */ | |
376 | list_for_each_entry(c, &iio_map_list, l) | |
377 | if (name && strcmp(name, c->map->consumer_dev_name) != 0) | |
378 | continue; | |
379 | else | |
380 | nummaps++; | |
381 | ||
382 | if (nummaps == 0) { | |
383 | ret = -ENODEV; | |
384 | goto error_ret; | |
385 | } | |
386 | ||
387 | /* NULL terminated array to save passing size */ | |
388 | chans = kzalloc(sizeof(*chans)*(nummaps + 1), GFP_KERNEL); | |
389 | if (chans == NULL) { | |
390 | ret = -ENOMEM; | |
391 | goto error_ret; | |
392 | } | |
393 | ||
394 | /* for each map fill in the chans element */ | |
395 | list_for_each_entry(c, &iio_map_list, l) { | |
396 | if (name && strcmp(name, c->map->consumer_dev_name) != 0) | |
397 | continue; | |
398 | chans[mapind].indio_dev = c->indio_dev; | |
0464415d | 399 | chans[mapind].data = c->map->consumer_data; |
e27d75d7 JC |
400 | chans[mapind].channel = |
401 | iio_chan_spec_from_name(chans[mapind].indio_dev, | |
402 | c->map->adc_channel_label); | |
403 | if (chans[mapind].channel == NULL) { | |
404 | ret = -EINVAL; | |
e27d75d7 JC |
405 | goto error_free_chans; |
406 | } | |
1875ffd2 | 407 | iio_device_get(chans[mapind].indio_dev); |
e27d75d7 JC |
408 | mapind++; |
409 | } | |
e27d75d7 JC |
410 | if (mapind == 0) { |
411 | ret = -ENODEV; | |
412 | goto error_free_chans; | |
413 | } | |
e59b9afe DC |
414 | mutex_unlock(&iio_map_list_lock); |
415 | ||
e27d75d7 JC |
416 | return chans; |
417 | ||
418 | error_free_chans: | |
419 | for (i = 0; i < nummaps; i++) | |
1875ffd2 | 420 | iio_device_put(chans[i].indio_dev); |
e27d75d7 JC |
421 | kfree(chans); |
422 | error_ret: | |
423 | mutex_unlock(&iio_map_list_lock); | |
424 | ||
425 | return ERR_PTR(ret); | |
426 | } | |
314be14b | 427 | EXPORT_SYMBOL_GPL(iio_channel_get_all); |
e27d75d7 | 428 | |
314be14b | 429 | void iio_channel_release_all(struct iio_channel *channels) |
e27d75d7 JC |
430 | { |
431 | struct iio_channel *chan = &channels[0]; | |
432 | ||
433 | while (chan->indio_dev) { | |
1875ffd2 | 434 | iio_device_put(chan->indio_dev); |
e27d75d7 JC |
435 | chan++; |
436 | } | |
437 | kfree(channels); | |
438 | } | |
314be14b | 439 | EXPORT_SYMBOL_GPL(iio_channel_release_all); |
e27d75d7 | 440 | |
48e44ce0 LPC |
441 | static int iio_channel_read(struct iio_channel *chan, int *val, int *val2, |
442 | enum iio_chan_info_enum info) | |
443 | { | |
444 | int unused; | |
9fbfb4b3 SP |
445 | int vals[INDIO_MAX_RAW_ELEMENTS]; |
446 | int ret; | |
447 | int val_len = 2; | |
48e44ce0 LPC |
448 | |
449 | if (val2 == NULL) | |
450 | val2 = &unused; | |
451 | ||
9fbfb4b3 SP |
452 | if (chan->indio_dev->info->read_raw_multi) { |
453 | ret = chan->indio_dev->info->read_raw_multi(chan->indio_dev, | |
454 | chan->channel, INDIO_MAX_RAW_ELEMENTS, | |
455 | vals, &val_len, info); | |
456 | *val = vals[0]; | |
457 | *val2 = vals[1]; | |
458 | } else | |
459 | ret = chan->indio_dev->info->read_raw(chan->indio_dev, | |
460 | chan->channel, val, val2, info); | |
461 | ||
462 | return ret; | |
48e44ce0 LPC |
463 | } |
464 | ||
314be14b | 465 | int iio_read_channel_raw(struct iio_channel *chan, int *val) |
e27d75d7 | 466 | { |
48e44ce0 | 467 | int ret; |
e27d75d7 JC |
468 | |
469 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
470 | if (chan->indio_dev->info == NULL) { | |
471 | ret = -ENODEV; | |
472 | goto err_unlock; | |
473 | } | |
474 | ||
48e44ce0 | 475 | ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW); |
e27d75d7 JC |
476 | err_unlock: |
477 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
478 | ||
479 | return ret; | |
480 | } | |
314be14b | 481 | EXPORT_SYMBOL_GPL(iio_read_channel_raw); |
e27d75d7 | 482 | |
476d4af2 SR |
483 | int iio_read_channel_average_raw(struct iio_channel *chan, int *val) |
484 | { | |
485 | int ret; | |
486 | ||
487 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
488 | if (chan->indio_dev->info == NULL) { | |
489 | ret = -ENODEV; | |
490 | goto err_unlock; | |
491 | } | |
492 | ||
493 | ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_AVERAGE_RAW); | |
494 | err_unlock: | |
495 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
496 | ||
497 | return ret; | |
498 | } | |
499 | EXPORT_SYMBOL_GPL(iio_read_channel_average_raw); | |
500 | ||
48e44ce0 LPC |
501 | static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan, |
502 | int raw, int *processed, unsigned int scale) | |
503 | { | |
504 | int scale_type, scale_val, scale_val2, offset; | |
505 | s64 raw64 = raw; | |
506 | int ret; | |
507 | ||
6c5d4c96 | 508 | ret = iio_channel_read(chan, &offset, NULL, IIO_CHAN_INFO_OFFSET); |
f91d1b63 | 509 | if (ret >= 0) |
48e44ce0 LPC |
510 | raw64 += offset; |
511 | ||
512 | scale_type = iio_channel_read(chan, &scale_val, &scale_val2, | |
513 | IIO_CHAN_INFO_SCALE); | |
514 | if (scale_type < 0) | |
515 | return scale_type; | |
516 | ||
517 | switch (scale_type) { | |
518 | case IIO_VAL_INT: | |
519 | *processed = raw64 * scale_val; | |
520 | break; | |
521 | case IIO_VAL_INT_PLUS_MICRO: | |
522 | if (scale_val2 < 0) | |
523 | *processed = -raw64 * scale_val; | |
524 | else | |
525 | *processed = raw64 * scale_val; | |
526 | *processed += div_s64(raw64 * (s64)scale_val2 * scale, | |
527 | 1000000LL); | |
528 | break; | |
529 | case IIO_VAL_INT_PLUS_NANO: | |
530 | if (scale_val2 < 0) | |
531 | *processed = -raw64 * scale_val; | |
532 | else | |
533 | *processed = raw64 * scale_val; | |
534 | *processed += div_s64(raw64 * (s64)scale_val2 * scale, | |
535 | 1000000000LL); | |
536 | break; | |
537 | case IIO_VAL_FRACTIONAL: | |
538 | *processed = div_s64(raw64 * (s64)scale_val * scale, | |
539 | scale_val2); | |
540 | break; | |
103d9fb9 LPC |
541 | case IIO_VAL_FRACTIONAL_LOG2: |
542 | *processed = (raw64 * (s64)scale_val * scale) >> scale_val2; | |
543 | break; | |
48e44ce0 LPC |
544 | default: |
545 | return -EINVAL; | |
546 | } | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
551 | int iio_convert_raw_to_processed(struct iio_channel *chan, int raw, | |
552 | int *processed, unsigned int scale) | |
553 | { | |
554 | int ret; | |
555 | ||
556 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
557 | if (chan->indio_dev->info == NULL) { | |
558 | ret = -ENODEV; | |
559 | goto err_unlock; | |
560 | } | |
561 | ||
562 | ret = iio_convert_raw_to_processed_unlocked(chan, raw, processed, | |
563 | scale); | |
564 | err_unlock: | |
565 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
566 | ||
567 | return ret; | |
568 | } | |
569 | EXPORT_SYMBOL_GPL(iio_convert_raw_to_processed); | |
570 | ||
571 | int iio_read_channel_processed(struct iio_channel *chan, int *val) | |
572 | { | |
573 | int ret; | |
574 | ||
575 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
576 | if (chan->indio_dev->info == NULL) { | |
577 | ret = -ENODEV; | |
578 | goto err_unlock; | |
579 | } | |
580 | ||
581 | if (iio_channel_has_info(chan->channel, IIO_CHAN_INFO_PROCESSED)) { | |
582 | ret = iio_channel_read(chan, val, NULL, | |
583 | IIO_CHAN_INFO_PROCESSED); | |
584 | } else { | |
585 | ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW); | |
586 | if (ret < 0) | |
587 | goto err_unlock; | |
588 | ret = iio_convert_raw_to_processed_unlocked(chan, *val, val, 1); | |
589 | } | |
590 | ||
591 | err_unlock: | |
592 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
593 | ||
594 | return ret; | |
595 | } | |
596 | EXPORT_SYMBOL_GPL(iio_read_channel_processed); | |
597 | ||
314be14b | 598 | int iio_read_channel_scale(struct iio_channel *chan, int *val, int *val2) |
e27d75d7 JC |
599 | { |
600 | int ret; | |
601 | ||
602 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
603 | if (chan->indio_dev->info == NULL) { | |
604 | ret = -ENODEV; | |
605 | goto err_unlock; | |
606 | } | |
607 | ||
48e44ce0 | 608 | ret = iio_channel_read(chan, val, val2, IIO_CHAN_INFO_SCALE); |
e27d75d7 JC |
609 | err_unlock: |
610 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
611 | ||
612 | return ret; | |
613 | } | |
314be14b | 614 | EXPORT_SYMBOL_GPL(iio_read_channel_scale); |
e27d75d7 | 615 | |
314be14b | 616 | int iio_get_channel_type(struct iio_channel *chan, enum iio_chan_type *type) |
e27d75d7 JC |
617 | { |
618 | int ret = 0; | |
619 | /* Need to verify underlying driver has not gone away */ | |
620 | ||
621 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
622 | if (chan->indio_dev->info == NULL) { | |
623 | ret = -ENODEV; | |
624 | goto err_unlock; | |
625 | } | |
626 | ||
627 | *type = chan->channel->type; | |
628 | err_unlock: | |
629 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
630 | ||
631 | return ret; | |
632 | } | |
314be14b | 633 | EXPORT_SYMBOL_GPL(iio_get_channel_type); |
f9380e71 DES |
634 | |
635 | static int iio_channel_write(struct iio_channel *chan, int val, int val2, | |
636 | enum iio_chan_info_enum info) | |
637 | { | |
638 | return chan->indio_dev->info->write_raw(chan->indio_dev, | |
639 | chan->channel, val, val2, info); | |
640 | } | |
641 | ||
642 | int iio_write_channel_raw(struct iio_channel *chan, int val) | |
643 | { | |
644 | int ret; | |
645 | ||
646 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
647 | if (chan->indio_dev->info == NULL) { | |
648 | ret = -ENODEV; | |
649 | goto err_unlock; | |
650 | } | |
651 | ||
652 | ret = iio_channel_write(chan, val, 0, IIO_CHAN_INFO_RAW); | |
653 | err_unlock: | |
654 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
655 | ||
656 | return ret; | |
657 | } | |
658 | EXPORT_SYMBOL_GPL(iio_write_channel_raw); |