]>
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> | |
13 | ||
06458e27 | 14 | #include <linux/iio/iio.h> |
e27d75d7 | 15 | #include "iio_core.h" |
06458e27 JC |
16 | #include <linux/iio/machine.h> |
17 | #include <linux/iio/driver.h> | |
18 | #include <linux/iio/consumer.h> | |
e27d75d7 JC |
19 | |
20 | struct iio_map_internal { | |
21 | struct iio_dev *indio_dev; | |
22 | struct iio_map *map; | |
23 | struct list_head l; | |
24 | }; | |
25 | ||
26 | static LIST_HEAD(iio_map_list); | |
27 | static DEFINE_MUTEX(iio_map_list_lock); | |
28 | ||
29 | int iio_map_array_register(struct iio_dev *indio_dev, struct iio_map *maps) | |
30 | { | |
31 | int i = 0, ret = 0; | |
32 | struct iio_map_internal *mapi; | |
33 | ||
34 | if (maps == NULL) | |
35 | return 0; | |
36 | ||
37 | mutex_lock(&iio_map_list_lock); | |
38 | while (maps[i].consumer_dev_name != NULL) { | |
39 | mapi = kzalloc(sizeof(*mapi), GFP_KERNEL); | |
40 | if (mapi == NULL) { | |
41 | ret = -ENOMEM; | |
42 | goto error_ret; | |
43 | } | |
44 | mapi->map = &maps[i]; | |
45 | mapi->indio_dev = indio_dev; | |
46 | list_add(&mapi->l, &iio_map_list); | |
47 | i++; | |
48 | } | |
49 | error_ret: | |
50 | mutex_unlock(&iio_map_list_lock); | |
51 | ||
52 | return ret; | |
53 | } | |
54 | EXPORT_SYMBOL_GPL(iio_map_array_register); | |
55 | ||
56 | ||
57 | /* Assumes the exact same array (e.g. memory locations) | |
58 | * used at unregistration as used at registration rather than | |
59 | * more complex checking of contents. | |
60 | */ | |
61 | int iio_map_array_unregister(struct iio_dev *indio_dev, | |
62 | struct iio_map *maps) | |
63 | { | |
64 | int i = 0, ret = 0; | |
65 | bool found_it; | |
66 | struct iio_map_internal *mapi; | |
67 | ||
68 | if (maps == NULL) | |
69 | return 0; | |
70 | ||
71 | mutex_lock(&iio_map_list_lock); | |
72 | while (maps[i].consumer_dev_name != NULL) { | |
73 | found_it = false; | |
74 | list_for_each_entry(mapi, &iio_map_list, l) | |
75 | if (&maps[i] == mapi->map) { | |
76 | list_del(&mapi->l); | |
77 | kfree(mapi); | |
78 | found_it = true; | |
79 | break; | |
80 | } | |
81 | if (found_it == false) { | |
82 | ret = -ENODEV; | |
83 | goto error_ret; | |
84 | } | |
218f4d43 | 85 | i++; |
e27d75d7 JC |
86 | } |
87 | error_ret: | |
88 | mutex_unlock(&iio_map_list_lock); | |
89 | ||
90 | return ret; | |
91 | } | |
92 | EXPORT_SYMBOL_GPL(iio_map_array_unregister); | |
93 | ||
94 | static const struct iio_chan_spec | |
314be14b | 95 | *iio_chan_spec_from_name(const struct iio_dev *indio_dev, const char *name) |
e27d75d7 JC |
96 | { |
97 | int i; | |
98 | const struct iio_chan_spec *chan = NULL; | |
99 | ||
100 | for (i = 0; i < indio_dev->num_channels; i++) | |
101 | if (indio_dev->channels[i].datasheet_name && | |
102 | strcmp(name, indio_dev->channels[i].datasheet_name) == 0) { | |
103 | chan = &indio_dev->channels[i]; | |
104 | break; | |
105 | } | |
106 | return chan; | |
107 | } | |
108 | ||
109 | ||
314be14b | 110 | struct iio_channel *iio_channel_get(const char *name, const char *channel_name) |
e27d75d7 JC |
111 | { |
112 | struct iio_map_internal *c_i = NULL, *c = NULL; | |
113 | struct iio_channel *channel; | |
3183bac1 | 114 | int err; |
e27d75d7 JC |
115 | |
116 | if (name == NULL && channel_name == NULL) | |
117 | return ERR_PTR(-ENODEV); | |
118 | ||
119 | /* first find matching entry the channel map */ | |
120 | mutex_lock(&iio_map_list_lock); | |
121 | list_for_each_entry(c_i, &iio_map_list, l) { | |
122 | if ((name && strcmp(name, c_i->map->consumer_dev_name) != 0) || | |
123 | (channel_name && | |
124 | strcmp(channel_name, c_i->map->consumer_channel) != 0)) | |
125 | continue; | |
126 | c = c_i; | |
1875ffd2 | 127 | iio_device_get(c->indio_dev); |
e27d75d7 JC |
128 | break; |
129 | } | |
130 | mutex_unlock(&iio_map_list_lock); | |
131 | if (c == NULL) | |
132 | return ERR_PTR(-ENODEV); | |
133 | ||
2cc412b5 | 134 | channel = kzalloc(sizeof(*channel), GFP_KERNEL); |
3183bac1 KM |
135 | if (channel == NULL) { |
136 | err = -ENOMEM; | |
801c4b5c | 137 | goto error_no_mem; |
3183bac1 | 138 | } |
e27d75d7 JC |
139 | |
140 | channel->indio_dev = c->indio_dev; | |
141 | ||
b2b79ffa | 142 | if (c->map->adc_channel_label) { |
e27d75d7 JC |
143 | channel->channel = |
144 | iio_chan_spec_from_name(channel->indio_dev, | |
145 | c->map->adc_channel_label); | |
146 | ||
3183bac1 KM |
147 | if (channel->channel == NULL) { |
148 | err = -EINVAL; | |
b2b79ffa | 149 | goto error_no_chan; |
3183bac1 | 150 | } |
b2b79ffa KM |
151 | } |
152 | ||
e27d75d7 | 153 | return channel; |
b2b79ffa KM |
154 | |
155 | error_no_chan: | |
b2b79ffa | 156 | kfree(channel); |
801c4b5c KM |
157 | error_no_mem: |
158 | iio_device_put(c->indio_dev); | |
3183bac1 | 159 | return ERR_PTR(err); |
e27d75d7 | 160 | } |
314be14b | 161 | EXPORT_SYMBOL_GPL(iio_channel_get); |
e27d75d7 | 162 | |
314be14b | 163 | void iio_channel_release(struct iio_channel *channel) |
e27d75d7 | 164 | { |
1875ffd2 | 165 | iio_device_put(channel->indio_dev); |
e27d75d7 JC |
166 | kfree(channel); |
167 | } | |
314be14b | 168 | EXPORT_SYMBOL_GPL(iio_channel_release); |
e27d75d7 | 169 | |
314be14b | 170 | struct iio_channel *iio_channel_get_all(const char *name) |
e27d75d7 JC |
171 | { |
172 | struct iio_channel *chans; | |
173 | struct iio_map_internal *c = NULL; | |
174 | int nummaps = 0; | |
175 | int mapind = 0; | |
176 | int i, ret; | |
177 | ||
178 | if (name == NULL) | |
179 | return ERR_PTR(-EINVAL); | |
180 | ||
181 | mutex_lock(&iio_map_list_lock); | |
182 | /* first count the matching maps */ | |
183 | list_for_each_entry(c, &iio_map_list, l) | |
184 | if (name && strcmp(name, c->map->consumer_dev_name) != 0) | |
185 | continue; | |
186 | else | |
187 | nummaps++; | |
188 | ||
189 | if (nummaps == 0) { | |
190 | ret = -ENODEV; | |
191 | goto error_ret; | |
192 | } | |
193 | ||
194 | /* NULL terminated array to save passing size */ | |
195 | chans = kzalloc(sizeof(*chans)*(nummaps + 1), GFP_KERNEL); | |
196 | if (chans == NULL) { | |
197 | ret = -ENOMEM; | |
198 | goto error_ret; | |
199 | } | |
200 | ||
201 | /* for each map fill in the chans element */ | |
202 | list_for_each_entry(c, &iio_map_list, l) { | |
203 | if (name && strcmp(name, c->map->consumer_dev_name) != 0) | |
204 | continue; | |
205 | chans[mapind].indio_dev = c->indio_dev; | |
206 | chans[mapind].channel = | |
207 | iio_chan_spec_from_name(chans[mapind].indio_dev, | |
208 | c->map->adc_channel_label); | |
209 | if (chans[mapind].channel == NULL) { | |
210 | ret = -EINVAL; | |
e27d75d7 JC |
211 | goto error_free_chans; |
212 | } | |
1875ffd2 | 213 | iio_device_get(chans[mapind].indio_dev); |
e27d75d7 JC |
214 | mapind++; |
215 | } | |
e27d75d7 JC |
216 | if (mapind == 0) { |
217 | ret = -ENODEV; | |
218 | goto error_free_chans; | |
219 | } | |
e59b9afe DC |
220 | mutex_unlock(&iio_map_list_lock); |
221 | ||
e27d75d7 JC |
222 | return chans; |
223 | ||
224 | error_free_chans: | |
225 | for (i = 0; i < nummaps; i++) | |
1875ffd2 | 226 | iio_device_put(chans[i].indio_dev); |
e27d75d7 JC |
227 | kfree(chans); |
228 | error_ret: | |
229 | mutex_unlock(&iio_map_list_lock); | |
230 | ||
231 | return ERR_PTR(ret); | |
232 | } | |
314be14b | 233 | EXPORT_SYMBOL_GPL(iio_channel_get_all); |
e27d75d7 | 234 | |
314be14b | 235 | void iio_channel_release_all(struct iio_channel *channels) |
e27d75d7 JC |
236 | { |
237 | struct iio_channel *chan = &channels[0]; | |
238 | ||
239 | while (chan->indio_dev) { | |
1875ffd2 | 240 | iio_device_put(chan->indio_dev); |
e27d75d7 JC |
241 | chan++; |
242 | } | |
243 | kfree(channels); | |
244 | } | |
314be14b | 245 | EXPORT_SYMBOL_GPL(iio_channel_release_all); |
e27d75d7 | 246 | |
48e44ce0 LPC |
247 | static int iio_channel_read(struct iio_channel *chan, int *val, int *val2, |
248 | enum iio_chan_info_enum info) | |
249 | { | |
250 | int unused; | |
251 | ||
252 | if (val2 == NULL) | |
253 | val2 = &unused; | |
254 | ||
255 | return chan->indio_dev->info->read_raw(chan->indio_dev, chan->channel, | |
256 | val, val2, info); | |
257 | } | |
258 | ||
314be14b | 259 | int iio_read_channel_raw(struct iio_channel *chan, int *val) |
e27d75d7 | 260 | { |
48e44ce0 | 261 | int ret; |
e27d75d7 JC |
262 | |
263 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
264 | if (chan->indio_dev->info == NULL) { | |
265 | ret = -ENODEV; | |
266 | goto err_unlock; | |
267 | } | |
268 | ||
48e44ce0 | 269 | ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW); |
e27d75d7 JC |
270 | err_unlock: |
271 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
272 | ||
273 | return ret; | |
274 | } | |
314be14b | 275 | EXPORT_SYMBOL_GPL(iio_read_channel_raw); |
e27d75d7 | 276 | |
48e44ce0 LPC |
277 | static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan, |
278 | int raw, int *processed, unsigned int scale) | |
279 | { | |
280 | int scale_type, scale_val, scale_val2, offset; | |
281 | s64 raw64 = raw; | |
282 | int ret; | |
283 | ||
284 | ret = iio_channel_read(chan, &offset, NULL, IIO_CHAN_INFO_SCALE); | |
285 | if (ret == 0) | |
286 | raw64 += offset; | |
287 | ||
288 | scale_type = iio_channel_read(chan, &scale_val, &scale_val2, | |
289 | IIO_CHAN_INFO_SCALE); | |
290 | if (scale_type < 0) | |
291 | return scale_type; | |
292 | ||
293 | switch (scale_type) { | |
294 | case IIO_VAL_INT: | |
295 | *processed = raw64 * scale_val; | |
296 | break; | |
297 | case IIO_VAL_INT_PLUS_MICRO: | |
298 | if (scale_val2 < 0) | |
299 | *processed = -raw64 * scale_val; | |
300 | else | |
301 | *processed = raw64 * scale_val; | |
302 | *processed += div_s64(raw64 * (s64)scale_val2 * scale, | |
303 | 1000000LL); | |
304 | break; | |
305 | case IIO_VAL_INT_PLUS_NANO: | |
306 | if (scale_val2 < 0) | |
307 | *processed = -raw64 * scale_val; | |
308 | else | |
309 | *processed = raw64 * scale_val; | |
310 | *processed += div_s64(raw64 * (s64)scale_val2 * scale, | |
311 | 1000000000LL); | |
312 | break; | |
313 | case IIO_VAL_FRACTIONAL: | |
314 | *processed = div_s64(raw64 * (s64)scale_val * scale, | |
315 | scale_val2); | |
316 | break; | |
317 | default: | |
318 | return -EINVAL; | |
319 | } | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | int iio_convert_raw_to_processed(struct iio_channel *chan, int raw, | |
325 | int *processed, unsigned int scale) | |
326 | { | |
327 | int ret; | |
328 | ||
329 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
330 | if (chan->indio_dev->info == NULL) { | |
331 | ret = -ENODEV; | |
332 | goto err_unlock; | |
333 | } | |
334 | ||
335 | ret = iio_convert_raw_to_processed_unlocked(chan, raw, processed, | |
336 | scale); | |
337 | err_unlock: | |
338 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
339 | ||
340 | return ret; | |
341 | } | |
342 | EXPORT_SYMBOL_GPL(iio_convert_raw_to_processed); | |
343 | ||
344 | int iio_read_channel_processed(struct iio_channel *chan, int *val) | |
345 | { | |
346 | int ret; | |
347 | ||
348 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
349 | if (chan->indio_dev->info == NULL) { | |
350 | ret = -ENODEV; | |
351 | goto err_unlock; | |
352 | } | |
353 | ||
354 | if (iio_channel_has_info(chan->channel, IIO_CHAN_INFO_PROCESSED)) { | |
355 | ret = iio_channel_read(chan, val, NULL, | |
356 | IIO_CHAN_INFO_PROCESSED); | |
357 | } else { | |
358 | ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW); | |
359 | if (ret < 0) | |
360 | goto err_unlock; | |
361 | ret = iio_convert_raw_to_processed_unlocked(chan, *val, val, 1); | |
362 | } | |
363 | ||
364 | err_unlock: | |
365 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
366 | ||
367 | return ret; | |
368 | } | |
369 | EXPORT_SYMBOL_GPL(iio_read_channel_processed); | |
370 | ||
314be14b | 371 | int iio_read_channel_scale(struct iio_channel *chan, int *val, int *val2) |
e27d75d7 JC |
372 | { |
373 | int ret; | |
374 | ||
375 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
376 | if (chan->indio_dev->info == NULL) { | |
377 | ret = -ENODEV; | |
378 | goto err_unlock; | |
379 | } | |
380 | ||
48e44ce0 | 381 | ret = iio_channel_read(chan, val, val2, IIO_CHAN_INFO_SCALE); |
e27d75d7 JC |
382 | err_unlock: |
383 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
384 | ||
385 | return ret; | |
386 | } | |
314be14b | 387 | EXPORT_SYMBOL_GPL(iio_read_channel_scale); |
e27d75d7 | 388 | |
314be14b | 389 | int iio_get_channel_type(struct iio_channel *chan, enum iio_chan_type *type) |
e27d75d7 JC |
390 | { |
391 | int ret = 0; | |
392 | /* Need to verify underlying driver has not gone away */ | |
393 | ||
394 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
395 | if (chan->indio_dev->info == NULL) { | |
396 | ret = -ENODEV; | |
397 | goto err_unlock; | |
398 | } | |
399 | ||
400 | *type = chan->channel->type; | |
401 | err_unlock: | |
402 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
403 | ||
404 | return ret; | |
405 | } | |
314be14b | 406 | EXPORT_SYMBOL_GPL(iio_get_channel_type); |