]>
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 | ||
6cb2afd7 GR |
57 | /* |
58 | * Remove all map entries associated with the given iio device | |
e27d75d7 | 59 | */ |
6cb2afd7 | 60 | int iio_map_array_unregister(struct iio_dev *indio_dev) |
e27d75d7 | 61 | { |
6cb2afd7 | 62 | int ret = -ENODEV; |
e27d75d7 | 63 | struct iio_map_internal *mapi; |
6cb2afd7 | 64 | struct list_head *pos, *tmp; |
e27d75d7 JC |
65 | |
66 | mutex_lock(&iio_map_list_lock); | |
6cb2afd7 GR |
67 | list_for_each_safe(pos, tmp, &iio_map_list) { |
68 | mapi = list_entry(pos, struct iio_map_internal, l); | |
69 | if (indio_dev == mapi->indio_dev) { | |
70 | list_del(&mapi->l); | |
71 | kfree(mapi); | |
72 | ret = 0; | |
e27d75d7 JC |
73 | } |
74 | } | |
e27d75d7 | 75 | mutex_unlock(&iio_map_list_lock); |
e27d75d7 JC |
76 | return ret; |
77 | } | |
78 | EXPORT_SYMBOL_GPL(iio_map_array_unregister); | |
79 | ||
80 | static const struct iio_chan_spec | |
314be14b | 81 | *iio_chan_spec_from_name(const struct iio_dev *indio_dev, const char *name) |
e27d75d7 JC |
82 | { |
83 | int i; | |
84 | const struct iio_chan_spec *chan = NULL; | |
85 | ||
86 | for (i = 0; i < indio_dev->num_channels; i++) | |
87 | if (indio_dev->channels[i].datasheet_name && | |
88 | strcmp(name, indio_dev->channels[i].datasheet_name) == 0) { | |
89 | chan = &indio_dev->channels[i]; | |
90 | break; | |
91 | } | |
92 | return chan; | |
93 | } | |
94 | ||
95 | ||
5aa57f0a GR |
96 | static struct iio_channel *iio_channel_get_sys(const char *name, |
97 | const char *channel_name) | |
e27d75d7 JC |
98 | { |
99 | struct iio_map_internal *c_i = NULL, *c = NULL; | |
100 | struct iio_channel *channel; | |
3183bac1 | 101 | int err; |
e27d75d7 JC |
102 | |
103 | if (name == NULL && channel_name == NULL) | |
104 | return ERR_PTR(-ENODEV); | |
105 | ||
106 | /* first find matching entry the channel map */ | |
107 | mutex_lock(&iio_map_list_lock); | |
108 | list_for_each_entry(c_i, &iio_map_list, l) { | |
109 | if ((name && strcmp(name, c_i->map->consumer_dev_name) != 0) || | |
110 | (channel_name && | |
111 | strcmp(channel_name, c_i->map->consumer_channel) != 0)) | |
112 | continue; | |
113 | c = c_i; | |
1875ffd2 | 114 | iio_device_get(c->indio_dev); |
e27d75d7 JC |
115 | break; |
116 | } | |
117 | mutex_unlock(&iio_map_list_lock); | |
118 | if (c == NULL) | |
119 | return ERR_PTR(-ENODEV); | |
120 | ||
2cc412b5 | 121 | channel = kzalloc(sizeof(*channel), GFP_KERNEL); |
3183bac1 KM |
122 | if (channel == NULL) { |
123 | err = -ENOMEM; | |
801c4b5c | 124 | goto error_no_mem; |
3183bac1 | 125 | } |
e27d75d7 JC |
126 | |
127 | channel->indio_dev = c->indio_dev; | |
128 | ||
b2b79ffa | 129 | if (c->map->adc_channel_label) { |
e27d75d7 JC |
130 | channel->channel = |
131 | iio_chan_spec_from_name(channel->indio_dev, | |
132 | c->map->adc_channel_label); | |
133 | ||
3183bac1 KM |
134 | if (channel->channel == NULL) { |
135 | err = -EINVAL; | |
b2b79ffa | 136 | goto error_no_chan; |
3183bac1 | 137 | } |
b2b79ffa KM |
138 | } |
139 | ||
e27d75d7 | 140 | return channel; |
b2b79ffa KM |
141 | |
142 | error_no_chan: | |
b2b79ffa | 143 | kfree(channel); |
801c4b5c KM |
144 | error_no_mem: |
145 | iio_device_put(c->indio_dev); | |
3183bac1 | 146 | return ERR_PTR(err); |
e27d75d7 | 147 | } |
5aa57f0a GR |
148 | |
149 | struct iio_channel *iio_channel_get(struct device *dev, | |
150 | const char *channel_name) | |
151 | { | |
152 | const char *name = dev ? dev_name(dev) : NULL; | |
153 | ||
154 | return iio_channel_get_sys(name, channel_name); | |
155 | } | |
314be14b | 156 | EXPORT_SYMBOL_GPL(iio_channel_get); |
e27d75d7 | 157 | |
314be14b | 158 | void iio_channel_release(struct iio_channel *channel) |
e27d75d7 | 159 | { |
1875ffd2 | 160 | iio_device_put(channel->indio_dev); |
e27d75d7 JC |
161 | kfree(channel); |
162 | } | |
314be14b | 163 | EXPORT_SYMBOL_GPL(iio_channel_release); |
e27d75d7 | 164 | |
ca7d98db | 165 | struct iio_channel *iio_channel_get_all(struct device *dev) |
e27d75d7 | 166 | { |
ca7d98db | 167 | const char *name; |
e27d75d7 JC |
168 | struct iio_channel *chans; |
169 | struct iio_map_internal *c = NULL; | |
170 | int nummaps = 0; | |
171 | int mapind = 0; | |
172 | int i, ret; | |
173 | ||
ca7d98db | 174 | if (dev == NULL) |
e27d75d7 | 175 | return ERR_PTR(-EINVAL); |
ca7d98db | 176 | name = dev_name(dev); |
e27d75d7 JC |
177 | |
178 | mutex_lock(&iio_map_list_lock); | |
179 | /* first count the matching maps */ | |
180 | list_for_each_entry(c, &iio_map_list, l) | |
181 | if (name && strcmp(name, c->map->consumer_dev_name) != 0) | |
182 | continue; | |
183 | else | |
184 | nummaps++; | |
185 | ||
186 | if (nummaps == 0) { | |
187 | ret = -ENODEV; | |
188 | goto error_ret; | |
189 | } | |
190 | ||
191 | /* NULL terminated array to save passing size */ | |
192 | chans = kzalloc(sizeof(*chans)*(nummaps + 1), GFP_KERNEL); | |
193 | if (chans == NULL) { | |
194 | ret = -ENOMEM; | |
195 | goto error_ret; | |
196 | } | |
197 | ||
198 | /* for each map fill in the chans element */ | |
199 | list_for_each_entry(c, &iio_map_list, l) { | |
200 | if (name && strcmp(name, c->map->consumer_dev_name) != 0) | |
201 | continue; | |
202 | chans[mapind].indio_dev = c->indio_dev; | |
0464415d | 203 | chans[mapind].data = c->map->consumer_data; |
e27d75d7 JC |
204 | chans[mapind].channel = |
205 | iio_chan_spec_from_name(chans[mapind].indio_dev, | |
206 | c->map->adc_channel_label); | |
207 | if (chans[mapind].channel == NULL) { | |
208 | ret = -EINVAL; | |
e27d75d7 JC |
209 | goto error_free_chans; |
210 | } | |
1875ffd2 | 211 | iio_device_get(chans[mapind].indio_dev); |
e27d75d7 JC |
212 | mapind++; |
213 | } | |
e27d75d7 JC |
214 | if (mapind == 0) { |
215 | ret = -ENODEV; | |
216 | goto error_free_chans; | |
217 | } | |
e59b9afe DC |
218 | mutex_unlock(&iio_map_list_lock); |
219 | ||
e27d75d7 JC |
220 | return chans; |
221 | ||
222 | error_free_chans: | |
223 | for (i = 0; i < nummaps; i++) | |
1875ffd2 | 224 | iio_device_put(chans[i].indio_dev); |
e27d75d7 JC |
225 | kfree(chans); |
226 | error_ret: | |
227 | mutex_unlock(&iio_map_list_lock); | |
228 | ||
229 | return ERR_PTR(ret); | |
230 | } | |
314be14b | 231 | EXPORT_SYMBOL_GPL(iio_channel_get_all); |
e27d75d7 | 232 | |
314be14b | 233 | void iio_channel_release_all(struct iio_channel *channels) |
e27d75d7 JC |
234 | { |
235 | struct iio_channel *chan = &channels[0]; | |
236 | ||
237 | while (chan->indio_dev) { | |
1875ffd2 | 238 | iio_device_put(chan->indio_dev); |
e27d75d7 JC |
239 | chan++; |
240 | } | |
241 | kfree(channels); | |
242 | } | |
314be14b | 243 | EXPORT_SYMBOL_GPL(iio_channel_release_all); |
e27d75d7 | 244 | |
48e44ce0 LPC |
245 | static int iio_channel_read(struct iio_channel *chan, int *val, int *val2, |
246 | enum iio_chan_info_enum info) | |
247 | { | |
248 | int unused; | |
249 | ||
250 | if (val2 == NULL) | |
251 | val2 = &unused; | |
252 | ||
253 | return chan->indio_dev->info->read_raw(chan->indio_dev, chan->channel, | |
254 | val, val2, info); | |
255 | } | |
256 | ||
314be14b | 257 | int iio_read_channel_raw(struct iio_channel *chan, int *val) |
e27d75d7 | 258 | { |
48e44ce0 | 259 | int ret; |
e27d75d7 JC |
260 | |
261 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
262 | if (chan->indio_dev->info == NULL) { | |
263 | ret = -ENODEV; | |
264 | goto err_unlock; | |
265 | } | |
266 | ||
48e44ce0 | 267 | ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW); |
e27d75d7 JC |
268 | err_unlock: |
269 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
270 | ||
271 | return ret; | |
272 | } | |
314be14b | 273 | EXPORT_SYMBOL_GPL(iio_read_channel_raw); |
e27d75d7 | 274 | |
48e44ce0 LPC |
275 | static int iio_convert_raw_to_processed_unlocked(struct iio_channel *chan, |
276 | int raw, int *processed, unsigned int scale) | |
277 | { | |
278 | int scale_type, scale_val, scale_val2, offset; | |
279 | s64 raw64 = raw; | |
280 | int ret; | |
281 | ||
282 | ret = iio_channel_read(chan, &offset, NULL, IIO_CHAN_INFO_SCALE); | |
283 | if (ret == 0) | |
284 | raw64 += offset; | |
285 | ||
286 | scale_type = iio_channel_read(chan, &scale_val, &scale_val2, | |
287 | IIO_CHAN_INFO_SCALE); | |
288 | if (scale_type < 0) | |
289 | return scale_type; | |
290 | ||
291 | switch (scale_type) { | |
292 | case IIO_VAL_INT: | |
293 | *processed = raw64 * scale_val; | |
294 | break; | |
295 | case IIO_VAL_INT_PLUS_MICRO: | |
296 | if (scale_val2 < 0) | |
297 | *processed = -raw64 * scale_val; | |
298 | else | |
299 | *processed = raw64 * scale_val; | |
300 | *processed += div_s64(raw64 * (s64)scale_val2 * scale, | |
301 | 1000000LL); | |
302 | break; | |
303 | case IIO_VAL_INT_PLUS_NANO: | |
304 | if (scale_val2 < 0) | |
305 | *processed = -raw64 * scale_val; | |
306 | else | |
307 | *processed = raw64 * scale_val; | |
308 | *processed += div_s64(raw64 * (s64)scale_val2 * scale, | |
309 | 1000000000LL); | |
310 | break; | |
311 | case IIO_VAL_FRACTIONAL: | |
312 | *processed = div_s64(raw64 * (s64)scale_val * scale, | |
313 | scale_val2); | |
314 | break; | |
103d9fb9 LPC |
315 | case IIO_VAL_FRACTIONAL_LOG2: |
316 | *processed = (raw64 * (s64)scale_val * scale) >> scale_val2; | |
317 | break; | |
48e44ce0 LPC |
318 | default: |
319 | return -EINVAL; | |
320 | } | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
325 | int iio_convert_raw_to_processed(struct iio_channel *chan, int raw, | |
326 | int *processed, unsigned int scale) | |
327 | { | |
328 | int ret; | |
329 | ||
330 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
331 | if (chan->indio_dev->info == NULL) { | |
332 | ret = -ENODEV; | |
333 | goto err_unlock; | |
334 | } | |
335 | ||
336 | ret = iio_convert_raw_to_processed_unlocked(chan, raw, processed, | |
337 | scale); | |
338 | err_unlock: | |
339 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
340 | ||
341 | return ret; | |
342 | } | |
343 | EXPORT_SYMBOL_GPL(iio_convert_raw_to_processed); | |
344 | ||
345 | int iio_read_channel_processed(struct iio_channel *chan, int *val) | |
346 | { | |
347 | int ret; | |
348 | ||
349 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
350 | if (chan->indio_dev->info == NULL) { | |
351 | ret = -ENODEV; | |
352 | goto err_unlock; | |
353 | } | |
354 | ||
355 | if (iio_channel_has_info(chan->channel, IIO_CHAN_INFO_PROCESSED)) { | |
356 | ret = iio_channel_read(chan, val, NULL, | |
357 | IIO_CHAN_INFO_PROCESSED); | |
358 | } else { | |
359 | ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW); | |
360 | if (ret < 0) | |
361 | goto err_unlock; | |
362 | ret = iio_convert_raw_to_processed_unlocked(chan, *val, val, 1); | |
363 | } | |
364 | ||
365 | err_unlock: | |
366 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
367 | ||
368 | return ret; | |
369 | } | |
370 | EXPORT_SYMBOL_GPL(iio_read_channel_processed); | |
371 | ||
314be14b | 372 | int iio_read_channel_scale(struct iio_channel *chan, int *val, int *val2) |
e27d75d7 JC |
373 | { |
374 | int ret; | |
375 | ||
376 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
377 | if (chan->indio_dev->info == NULL) { | |
378 | ret = -ENODEV; | |
379 | goto err_unlock; | |
380 | } | |
381 | ||
48e44ce0 | 382 | ret = iio_channel_read(chan, val, val2, IIO_CHAN_INFO_SCALE); |
e27d75d7 JC |
383 | err_unlock: |
384 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
385 | ||
386 | return ret; | |
387 | } | |
314be14b | 388 | EXPORT_SYMBOL_GPL(iio_read_channel_scale); |
e27d75d7 | 389 | |
314be14b | 390 | int iio_get_channel_type(struct iio_channel *chan, enum iio_chan_type *type) |
e27d75d7 JC |
391 | { |
392 | int ret = 0; | |
393 | /* Need to verify underlying driver has not gone away */ | |
394 | ||
395 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
396 | if (chan->indio_dev->info == NULL) { | |
397 | ret = -ENODEV; | |
398 | goto err_unlock; | |
399 | } | |
400 | ||
401 | *type = chan->channel->type; | |
402 | err_unlock: | |
403 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
404 | ||
405 | return ret; | |
406 | } | |
314be14b | 407 | EXPORT_SYMBOL_GPL(iio_get_channel_type); |