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; |
c34c1819 | 64 | struct iio_map_internal *mapi, *next; |
e27d75d7 JC |
65 | |
66 | mutex_lock(&iio_map_list_lock); | |
c34c1819 | 67 | list_for_each_entry_safe(mapi, next, &iio_map_list, l) { |
6cb2afd7 GR |
68 | if (indio_dev == mapi->indio_dev) { |
69 | list_del(&mapi->l); | |
70 | kfree(mapi); | |
71 | ret = 0; | |
e27d75d7 JC |
72 | } |
73 | } | |
e27d75d7 | 74 | mutex_unlock(&iio_map_list_lock); |
e27d75d7 JC |
75 | return ret; |
76 | } | |
77 | EXPORT_SYMBOL_GPL(iio_map_array_unregister); | |
78 | ||
79 | static const struct iio_chan_spec | |
314be14b | 80 | *iio_chan_spec_from_name(const struct iio_dev *indio_dev, const char *name) |
e27d75d7 JC |
81 | { |
82 | int i; | |
83 | const struct iio_chan_spec *chan = NULL; | |
84 | ||
85 | for (i = 0; i < indio_dev->num_channels; i++) | |
86 | if (indio_dev->channels[i].datasheet_name && | |
87 | strcmp(name, indio_dev->channels[i].datasheet_name) == 0) { | |
88 | chan = &indio_dev->channels[i]; | |
89 | break; | |
90 | } | |
91 | return chan; | |
92 | } | |
93 | ||
17d82b47 GR |
94 | #ifdef CONFIG_OF |
95 | ||
96 | static int iio_dev_node_match(struct device *dev, void *data) | |
97 | { | |
98 | return dev->of_node == data && dev->type == &iio_device_type; | |
99 | } | |
100 | ||
acd82567 II |
101 | /** |
102 | * __of_iio_simple_xlate - translate iiospec to the IIO channel index | |
103 | * @indio_dev: pointer to the iio_dev structure | |
104 | * @iiospec: IIO specifier as found in the device tree | |
105 | * | |
106 | * This is simple translation function, suitable for the most 1:1 mapped | |
107 | * channels in IIO chips. This function performs only one sanity check: | |
108 | * whether IIO index is less than num_channels (that is specified in the | |
109 | * iio_dev). | |
110 | */ | |
111 | static int __of_iio_simple_xlate(struct iio_dev *indio_dev, | |
112 | const struct of_phandle_args *iiospec) | |
113 | { | |
114 | if (!iiospec->args_count) | |
115 | return 0; | |
116 | ||
1f202725 SW |
117 | if (iiospec->args[0] >= indio_dev->num_channels) { |
118 | dev_err(&indio_dev->dev, "invalid channel index %u\n", | |
119 | iiospec->args[0]); | |
acd82567 | 120 | return -EINVAL; |
1f202725 | 121 | } |
acd82567 II |
122 | |
123 | return iiospec->args[0]; | |
124 | } | |
125 | ||
17d82b47 GR |
126 | static int __of_iio_channel_get(struct iio_channel *channel, |
127 | struct device_node *np, int index) | |
128 | { | |
129 | struct device *idev; | |
130 | struct iio_dev *indio_dev; | |
131 | int err; | |
132 | struct of_phandle_args iiospec; | |
133 | ||
134 | err = of_parse_phandle_with_args(np, "io-channels", | |
135 | "#io-channel-cells", | |
136 | index, &iiospec); | |
137 | if (err) | |
138 | return err; | |
139 | ||
140 | idev = bus_find_device(&iio_bus_type, NULL, iiospec.np, | |
141 | iio_dev_node_match); | |
142 | of_node_put(iiospec.np); | |
143 | if (idev == NULL) | |
144 | return -EPROBE_DEFER; | |
145 | ||
146 | indio_dev = dev_to_iio_dev(idev); | |
147 | channel->indio_dev = indio_dev; | |
acd82567 II |
148 | if (indio_dev->info->of_xlate) |
149 | index = indio_dev->info->of_xlate(indio_dev, &iiospec); | |
150 | else | |
151 | index = __of_iio_simple_xlate(indio_dev, &iiospec); | |
152 | if (index < 0) | |
17d82b47 | 153 | goto err_put; |
17d82b47 GR |
154 | channel->channel = &indio_dev->channels[index]; |
155 | ||
156 | return 0; | |
157 | ||
158 | err_put: | |
159 | iio_device_put(indio_dev); | |
acd82567 | 160 | return index; |
17d82b47 GR |
161 | } |
162 | ||
163 | static struct iio_channel *of_iio_channel_get(struct device_node *np, int index) | |
164 | { | |
165 | struct iio_channel *channel; | |
166 | int err; | |
167 | ||
168 | if (index < 0) | |
169 | return ERR_PTR(-EINVAL); | |
170 | ||
171 | channel = kzalloc(sizeof(*channel), GFP_KERNEL); | |
172 | if (channel == NULL) | |
173 | return ERR_PTR(-ENOMEM); | |
174 | ||
175 | err = __of_iio_channel_get(channel, np, index); | |
176 | if (err) | |
177 | goto err_free_channel; | |
178 | ||
179 | return channel; | |
180 | ||
181 | err_free_channel: | |
182 | kfree(channel); | |
183 | return ERR_PTR(err); | |
184 | } | |
185 | ||
186 | static struct iio_channel *of_iio_channel_get_by_name(struct device_node *np, | |
187 | const char *name) | |
188 | { | |
189 | struct iio_channel *chan = NULL; | |
190 | ||
191 | /* Walk up the tree of devices looking for a matching iio channel */ | |
192 | while (np) { | |
193 | int index = 0; | |
194 | ||
195 | /* | |
196 | * For named iio channels, first look up the name in the | |
197 | * "io-channel-names" property. If it cannot be found, the | |
198 | * index will be an error code, and of_iio_channel_get() | |
199 | * will fail. | |
200 | */ | |
201 | if (name) | |
202 | index = of_property_match_string(np, "io-channel-names", | |
203 | name); | |
204 | chan = of_iio_channel_get(np, index); | |
872687f6 | 205 | if (!IS_ERR(chan) || PTR_ERR(chan) == -EPROBE_DEFER) |
17d82b47 GR |
206 | break; |
207 | else if (name && index >= 0) { | |
208 | pr_err("ERROR: could not get IIO channel %s:%s(%i)\n", | |
209 | np->full_name, name ? name : "", index); | |
a2c12493 | 210 | return NULL; |
17d82b47 GR |
211 | } |
212 | ||
213 | /* | |
214 | * No matching IIO channel found on this node. | |
215 | * If the parent node has a "io-channel-ranges" property, | |
216 | * then we can try one of its channels. | |
217 | */ | |
218 | np = np->parent; | |
219 | if (np && !of_get_property(np, "io-channel-ranges", NULL)) | |
a2c12493 | 220 | return NULL; |
17d82b47 | 221 | } |
a2c12493 | 222 | |
17d82b47 GR |
223 | return chan; |
224 | } | |
225 | ||
226 | static struct iio_channel *of_iio_channel_get_all(struct device *dev) | |
227 | { | |
228 | struct iio_channel *chans; | |
229 | int i, mapind, nummaps = 0; | |
230 | int ret; | |
231 | ||
232 | do { | |
233 | ret = of_parse_phandle_with_args(dev->of_node, | |
234 | "io-channels", | |
235 | "#io-channel-cells", | |
236 | nummaps, NULL); | |
237 | if (ret < 0) | |
238 | break; | |
239 | } while (++nummaps); | |
240 | ||
241 | if (nummaps == 0) /* no error, return NULL to search map table */ | |
242 | return NULL; | |
243 | ||
244 | /* NULL terminated array to save passing size */ | |
245 | chans = kcalloc(nummaps + 1, sizeof(*chans), GFP_KERNEL); | |
246 | if (chans == NULL) | |
247 | return ERR_PTR(-ENOMEM); | |
248 | ||
249 | /* Search for OF matches */ | |
250 | for (mapind = 0; mapind < nummaps; mapind++) { | |
251 | ret = __of_iio_channel_get(&chans[mapind], dev->of_node, | |
252 | mapind); | |
253 | if (ret) | |
254 | goto error_free_chans; | |
255 | } | |
256 | return chans; | |
257 | ||
258 | error_free_chans: | |
259 | for (i = 0; i < mapind; i++) | |
260 | iio_device_put(chans[i].indio_dev); | |
261 | kfree(chans); | |
262 | return ERR_PTR(ret); | |
263 | } | |
264 | ||
265 | #else /* CONFIG_OF */ | |
266 | ||
267 | static inline struct iio_channel * | |
268 | of_iio_channel_get_by_name(struct device_node *np, const char *name) | |
269 | { | |
270 | return NULL; | |
271 | } | |
272 | ||
273 | static inline struct iio_channel *of_iio_channel_get_all(struct device *dev) | |
274 | { | |
275 | return NULL; | |
276 | } | |
277 | ||
278 | #endif /* CONFIG_OF */ | |
e27d75d7 | 279 | |
5aa57f0a GR |
280 | static struct iio_channel *iio_channel_get_sys(const char *name, |
281 | const char *channel_name) | |
e27d75d7 JC |
282 | { |
283 | struct iio_map_internal *c_i = NULL, *c = NULL; | |
284 | struct iio_channel *channel; | |
3183bac1 | 285 | int err; |
e27d75d7 JC |
286 | |
287 | if (name == NULL && channel_name == NULL) | |
288 | return ERR_PTR(-ENODEV); | |
289 | ||
290 | /* first find matching entry the channel map */ | |
291 | mutex_lock(&iio_map_list_lock); | |
292 | list_for_each_entry(c_i, &iio_map_list, l) { | |
293 | if ((name && strcmp(name, c_i->map->consumer_dev_name) != 0) || | |
294 | (channel_name && | |
295 | strcmp(channel_name, c_i->map->consumer_channel) != 0)) | |
296 | continue; | |
297 | c = c_i; | |
1875ffd2 | 298 | iio_device_get(c->indio_dev); |
e27d75d7 JC |
299 | break; |
300 | } | |
301 | mutex_unlock(&iio_map_list_lock); | |
302 | if (c == NULL) | |
303 | return ERR_PTR(-ENODEV); | |
304 | ||
2cc412b5 | 305 | channel = kzalloc(sizeof(*channel), GFP_KERNEL); |
3183bac1 KM |
306 | if (channel == NULL) { |
307 | err = -ENOMEM; | |
801c4b5c | 308 | goto error_no_mem; |
3183bac1 | 309 | } |
e27d75d7 JC |
310 | |
311 | channel->indio_dev = c->indio_dev; | |
312 | ||
b2b79ffa | 313 | if (c->map->adc_channel_label) { |
e27d75d7 JC |
314 | channel->channel = |
315 | iio_chan_spec_from_name(channel->indio_dev, | |
316 | c->map->adc_channel_label); | |
317 | ||
3183bac1 KM |
318 | if (channel->channel == NULL) { |
319 | err = -EINVAL; | |
b2b79ffa | 320 | goto error_no_chan; |
3183bac1 | 321 | } |
b2b79ffa KM |
322 | } |
323 | ||
e27d75d7 | 324 | return channel; |
b2b79ffa KM |
325 | |
326 | error_no_chan: | |
b2b79ffa | 327 | kfree(channel); |
801c4b5c KM |
328 | error_no_mem: |
329 | iio_device_put(c->indio_dev); | |
3183bac1 | 330 | return ERR_PTR(err); |
e27d75d7 | 331 | } |
5aa57f0a GR |
332 | |
333 | struct iio_channel *iio_channel_get(struct device *dev, | |
334 | const char *channel_name) | |
335 | { | |
336 | const char *name = dev ? dev_name(dev) : NULL; | |
17d82b47 | 337 | struct iio_channel *channel; |
5aa57f0a | 338 | |
17d82b47 GR |
339 | if (dev) { |
340 | channel = of_iio_channel_get_by_name(dev->of_node, | |
341 | channel_name); | |
342 | if (channel != NULL) | |
343 | return channel; | |
344 | } | |
a2c12493 | 345 | |
5aa57f0a GR |
346 | return iio_channel_get_sys(name, channel_name); |
347 | } | |
314be14b | 348 | EXPORT_SYMBOL_GPL(iio_channel_get); |
e27d75d7 | 349 | |
314be14b | 350 | void iio_channel_release(struct iio_channel *channel) |
e27d75d7 | 351 | { |
1875ffd2 | 352 | iio_device_put(channel->indio_dev); |
e27d75d7 JC |
353 | kfree(channel); |
354 | } | |
314be14b | 355 | EXPORT_SYMBOL_GPL(iio_channel_release); |
e27d75d7 | 356 | |
ca7d98db | 357 | struct iio_channel *iio_channel_get_all(struct device *dev) |
e27d75d7 | 358 | { |
ca7d98db | 359 | const char *name; |
e27d75d7 JC |
360 | struct iio_channel *chans; |
361 | struct iio_map_internal *c = NULL; | |
362 | int nummaps = 0; | |
363 | int mapind = 0; | |
364 | int i, ret; | |
365 | ||
ca7d98db | 366 | if (dev == NULL) |
e27d75d7 | 367 | return ERR_PTR(-EINVAL); |
17d82b47 GR |
368 | |
369 | chans = of_iio_channel_get_all(dev); | |
370 | if (chans) | |
371 | return chans; | |
372 | ||
ca7d98db | 373 | name = dev_name(dev); |
e27d75d7 JC |
374 | |
375 | mutex_lock(&iio_map_list_lock); | |
376 | /* first count the matching maps */ | |
377 | list_for_each_entry(c, &iio_map_list, l) | |
378 | if (name && strcmp(name, c->map->consumer_dev_name) != 0) | |
379 | continue; | |
380 | else | |
381 | nummaps++; | |
382 | ||
383 | if (nummaps == 0) { | |
384 | ret = -ENODEV; | |
385 | goto error_ret; | |
386 | } | |
387 | ||
388 | /* NULL terminated array to save passing size */ | |
389 | chans = kzalloc(sizeof(*chans)*(nummaps + 1), GFP_KERNEL); | |
390 | if (chans == NULL) { | |
391 | ret = -ENOMEM; | |
392 | goto error_ret; | |
393 | } | |
394 | ||
395 | /* for each map fill in the chans element */ | |
396 | list_for_each_entry(c, &iio_map_list, l) { | |
397 | if (name && strcmp(name, c->map->consumer_dev_name) != 0) | |
398 | continue; | |
399 | chans[mapind].indio_dev = c->indio_dev; | |
0464415d | 400 | chans[mapind].data = c->map->consumer_data; |
e27d75d7 JC |
401 | chans[mapind].channel = |
402 | iio_chan_spec_from_name(chans[mapind].indio_dev, | |
403 | c->map->adc_channel_label); | |
404 | if (chans[mapind].channel == NULL) { | |
405 | ret = -EINVAL; | |
e27d75d7 JC |
406 | goto error_free_chans; |
407 | } | |
1875ffd2 | 408 | iio_device_get(chans[mapind].indio_dev); |
e27d75d7 JC |
409 | mapind++; |
410 | } | |
e27d75d7 JC |
411 | if (mapind == 0) { |
412 | ret = -ENODEV; | |
413 | goto error_free_chans; | |
414 | } | |
e59b9afe DC |
415 | mutex_unlock(&iio_map_list_lock); |
416 | ||
e27d75d7 JC |
417 | return chans; |
418 | ||
419 | error_free_chans: | |
420 | for (i = 0; i < nummaps; i++) | |
1875ffd2 | 421 | iio_device_put(chans[i].indio_dev); |
e27d75d7 JC |
422 | kfree(chans); |
423 | error_ret: | |
424 | mutex_unlock(&iio_map_list_lock); | |
425 | ||
426 | return ERR_PTR(ret); | |
427 | } | |
314be14b | 428 | EXPORT_SYMBOL_GPL(iio_channel_get_all); |
e27d75d7 | 429 | |
314be14b | 430 | void iio_channel_release_all(struct iio_channel *channels) |
e27d75d7 JC |
431 | { |
432 | struct iio_channel *chan = &channels[0]; | |
433 | ||
434 | while (chan->indio_dev) { | |
1875ffd2 | 435 | iio_device_put(chan->indio_dev); |
e27d75d7 JC |
436 | chan++; |
437 | } | |
438 | kfree(channels); | |
439 | } | |
314be14b | 440 | EXPORT_SYMBOL_GPL(iio_channel_release_all); |
e27d75d7 | 441 | |
48e44ce0 LPC |
442 | static int iio_channel_read(struct iio_channel *chan, int *val, int *val2, |
443 | enum iio_chan_info_enum info) | |
444 | { | |
445 | int unused; | |
9fbfb4b3 SP |
446 | int vals[INDIO_MAX_RAW_ELEMENTS]; |
447 | int ret; | |
448 | int val_len = 2; | |
48e44ce0 LPC |
449 | |
450 | if (val2 == NULL) | |
451 | val2 = &unused; | |
452 | ||
65de7654 FP |
453 | if(!iio_channel_has_info(chan->channel, info)) |
454 | return -EINVAL; | |
455 | ||
9fbfb4b3 SP |
456 | if (chan->indio_dev->info->read_raw_multi) { |
457 | ret = chan->indio_dev->info->read_raw_multi(chan->indio_dev, | |
458 | chan->channel, INDIO_MAX_RAW_ELEMENTS, | |
459 | vals, &val_len, info); | |
460 | *val = vals[0]; | |
461 | *val2 = vals[1]; | |
462 | } else | |
463 | ret = chan->indio_dev->info->read_raw(chan->indio_dev, | |
464 | chan->channel, val, val2, info); | |
465 | ||
466 | return ret; | |
48e44ce0 LPC |
467 | } |
468 | ||
314be14b | 469 | int iio_read_channel_raw(struct iio_channel *chan, int *val) |
e27d75d7 | 470 | { |
48e44ce0 | 471 | int ret; |
e27d75d7 JC |
472 | |
473 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
474 | if (chan->indio_dev->info == NULL) { | |
475 | ret = -ENODEV; | |
476 | goto err_unlock; | |
477 | } | |
478 | ||
48e44ce0 | 479 | ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW); |
e27d75d7 JC |
480 | err_unlock: |
481 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
482 | ||
483 | return ret; | |
484 | } | |
314be14b | 485 | EXPORT_SYMBOL_GPL(iio_read_channel_raw); |
e27d75d7 | 486 | |
476d4af2 SR |
487 | int iio_read_channel_average_raw(struct iio_channel *chan, int *val) |
488 | { | |
489 | int ret; | |
490 | ||
491 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
492 | if (chan->indio_dev->info == NULL) { | |
493 | ret = -ENODEV; | |
494 | goto err_unlock; | |
495 | } | |
496 | ||
497 | ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_AVERAGE_RAW); | |
498 | err_unlock: | |
499 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
500 | ||
501 | return ret; | |
502 | } | |
503 | EXPORT_SYMBOL_GPL(iio_read_channel_average_raw); | |
504 | ||
48e44ce0 LPC |
505 | static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan, |
506 | int raw, int *processed, unsigned int scale) | |
507 | { | |
508 | int scale_type, scale_val, scale_val2, offset; | |
509 | s64 raw64 = raw; | |
510 | int ret; | |
511 | ||
6c5d4c96 | 512 | ret = iio_channel_read(chan, &offset, NULL, IIO_CHAN_INFO_OFFSET); |
f91d1b63 | 513 | if (ret >= 0) |
48e44ce0 LPC |
514 | raw64 += offset; |
515 | ||
516 | scale_type = iio_channel_read(chan, &scale_val, &scale_val2, | |
517 | IIO_CHAN_INFO_SCALE); | |
518 | if (scale_type < 0) | |
519 | return scale_type; | |
520 | ||
521 | switch (scale_type) { | |
522 | case IIO_VAL_INT: | |
523 | *processed = raw64 * scale_val; | |
524 | break; | |
525 | case IIO_VAL_INT_PLUS_MICRO: | |
526 | if (scale_val2 < 0) | |
527 | *processed = -raw64 * scale_val; | |
528 | else | |
529 | *processed = raw64 * scale_val; | |
530 | *processed += div_s64(raw64 * (s64)scale_val2 * scale, | |
531 | 1000000LL); | |
532 | break; | |
533 | case IIO_VAL_INT_PLUS_NANO: | |
534 | if (scale_val2 < 0) | |
535 | *processed = -raw64 * scale_val; | |
536 | else | |
537 | *processed = raw64 * scale_val; | |
538 | *processed += div_s64(raw64 * (s64)scale_val2 * scale, | |
539 | 1000000000LL); | |
540 | break; | |
541 | case IIO_VAL_FRACTIONAL: | |
542 | *processed = div_s64(raw64 * (s64)scale_val * scale, | |
543 | scale_val2); | |
544 | break; | |
103d9fb9 LPC |
545 | case IIO_VAL_FRACTIONAL_LOG2: |
546 | *processed = (raw64 * (s64)scale_val * scale) >> scale_val2; | |
547 | break; | |
48e44ce0 LPC |
548 | default: |
549 | return -EINVAL; | |
550 | } | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
555 | int iio_convert_raw_to_processed(struct iio_channel *chan, int raw, | |
556 | int *processed, unsigned int scale) | |
557 | { | |
558 | int ret; | |
559 | ||
560 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
561 | if (chan->indio_dev->info == NULL) { | |
562 | ret = -ENODEV; | |
563 | goto err_unlock; | |
564 | } | |
565 | ||
566 | ret = iio_convert_raw_to_processed_unlocked(chan, raw, processed, | |
567 | scale); | |
568 | err_unlock: | |
569 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
570 | ||
571 | return ret; | |
572 | } | |
573 | EXPORT_SYMBOL_GPL(iio_convert_raw_to_processed); | |
574 | ||
575 | int iio_read_channel_processed(struct iio_channel *chan, int *val) | |
576 | { | |
577 | int ret; | |
578 | ||
579 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
580 | if (chan->indio_dev->info == NULL) { | |
581 | ret = -ENODEV; | |
582 | goto err_unlock; | |
583 | } | |
584 | ||
585 | if (iio_channel_has_info(chan->channel, IIO_CHAN_INFO_PROCESSED)) { | |
586 | ret = iio_channel_read(chan, val, NULL, | |
587 | IIO_CHAN_INFO_PROCESSED); | |
588 | } else { | |
589 | ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW); | |
590 | if (ret < 0) | |
591 | goto err_unlock; | |
592 | ret = iio_convert_raw_to_processed_unlocked(chan, *val, val, 1); | |
593 | } | |
594 | ||
595 | err_unlock: | |
596 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
597 | ||
598 | return ret; | |
599 | } | |
600 | EXPORT_SYMBOL_GPL(iio_read_channel_processed); | |
601 | ||
314be14b | 602 | int iio_read_channel_scale(struct iio_channel *chan, int *val, int *val2) |
e27d75d7 JC |
603 | { |
604 | int ret; | |
605 | ||
606 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
607 | if (chan->indio_dev->info == NULL) { | |
608 | ret = -ENODEV; | |
609 | goto err_unlock; | |
610 | } | |
611 | ||
48e44ce0 | 612 | ret = iio_channel_read(chan, val, val2, IIO_CHAN_INFO_SCALE); |
e27d75d7 JC |
613 | err_unlock: |
614 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
615 | ||
616 | return ret; | |
617 | } | |
314be14b | 618 | EXPORT_SYMBOL_GPL(iio_read_channel_scale); |
e27d75d7 | 619 | |
314be14b | 620 | int iio_get_channel_type(struct iio_channel *chan, enum iio_chan_type *type) |
e27d75d7 JC |
621 | { |
622 | int ret = 0; | |
623 | /* Need to verify underlying driver has not gone away */ | |
624 | ||
625 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
626 | if (chan->indio_dev->info == NULL) { | |
627 | ret = -ENODEV; | |
628 | goto err_unlock; | |
629 | } | |
630 | ||
631 | *type = chan->channel->type; | |
632 | err_unlock: | |
633 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
634 | ||
635 | return ret; | |
636 | } | |
314be14b | 637 | EXPORT_SYMBOL_GPL(iio_get_channel_type); |
f9380e71 DES |
638 | |
639 | static int iio_channel_write(struct iio_channel *chan, int val, int val2, | |
640 | enum iio_chan_info_enum info) | |
641 | { | |
642 | return chan->indio_dev->info->write_raw(chan->indio_dev, | |
643 | chan->channel, val, val2, info); | |
644 | } | |
645 | ||
646 | int iio_write_channel_raw(struct iio_channel *chan, int val) | |
647 | { | |
648 | int ret; | |
649 | ||
650 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
651 | if (chan->indio_dev->info == NULL) { | |
652 | ret = -ENODEV; | |
653 | goto err_unlock; | |
654 | } | |
655 | ||
656 | ret = iio_channel_write(chan, val, 0, IIO_CHAN_INFO_RAW); | |
657 | err_unlock: | |
658 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
659 | ||
660 | return ret; | |
661 | } | |
662 | EXPORT_SYMBOL_GPL(iio_write_channel_raw); |