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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> | |
13 | ||
14 | #include "iio.h" | |
15 | #include "iio_core.h" | |
16 | #include "machine.h" | |
17 | #include "driver.h" | |
18 | #include "consumer.h" | |
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 | } | |
85 | } | |
86 | error_ret: | |
87 | mutex_unlock(&iio_map_list_lock); | |
88 | ||
89 | return ret; | |
90 | } | |
91 | EXPORT_SYMBOL_GPL(iio_map_array_unregister); | |
92 | ||
93 | static const struct iio_chan_spec | |
94 | *iio_chan_spec_from_name(const struct iio_dev *indio_dev, | |
95 | const char *name) | |
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 | ||
110 | struct iio_channel *iio_st_channel_get(const char *name, | |
111 | const char *channel_name) | |
112 | { | |
113 | struct iio_map_internal *c_i = NULL, *c = NULL; | |
114 | struct iio_channel *channel; | |
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; | |
127 | get_device(&c->indio_dev->dev); | |
128 | break; | |
129 | } | |
130 | mutex_unlock(&iio_map_list_lock); | |
131 | if (c == NULL) | |
132 | return ERR_PTR(-ENODEV); | |
133 | ||
134 | channel = kmalloc(sizeof(*channel), GFP_KERNEL); | |
135 | if (channel == NULL) | |
136 | return ERR_PTR(-ENOMEM); | |
137 | ||
138 | channel->indio_dev = c->indio_dev; | |
139 | ||
140 | if (c->map->adc_channel_label) | |
141 | channel->channel = | |
142 | iio_chan_spec_from_name(channel->indio_dev, | |
143 | c->map->adc_channel_label); | |
144 | ||
145 | return channel; | |
146 | } | |
147 | EXPORT_SYMBOL_GPL(iio_st_channel_get); | |
148 | ||
149 | void iio_st_channel_release(struct iio_channel *channel) | |
150 | { | |
151 | put_device(&channel->indio_dev->dev); | |
152 | kfree(channel); | |
153 | } | |
154 | EXPORT_SYMBOL_GPL(iio_st_channel_release); | |
155 | ||
156 | struct iio_channel *iio_st_channel_get_all(const char *name) | |
157 | { | |
158 | struct iio_channel *chans; | |
159 | struct iio_map_internal *c = NULL; | |
160 | int nummaps = 0; | |
161 | int mapind = 0; | |
162 | int i, ret; | |
163 | ||
164 | if (name == NULL) | |
165 | return ERR_PTR(-EINVAL); | |
166 | ||
167 | mutex_lock(&iio_map_list_lock); | |
168 | /* first count the matching maps */ | |
169 | list_for_each_entry(c, &iio_map_list, l) | |
170 | if (name && strcmp(name, c->map->consumer_dev_name) != 0) | |
171 | continue; | |
172 | else | |
173 | nummaps++; | |
174 | ||
175 | if (nummaps == 0) { | |
176 | ret = -ENODEV; | |
177 | goto error_ret; | |
178 | } | |
179 | ||
180 | /* NULL terminated array to save passing size */ | |
181 | chans = kzalloc(sizeof(*chans)*(nummaps + 1), GFP_KERNEL); | |
182 | if (chans == NULL) { | |
183 | ret = -ENOMEM; | |
184 | goto error_ret; | |
185 | } | |
186 | ||
187 | /* for each map fill in the chans element */ | |
188 | list_for_each_entry(c, &iio_map_list, l) { | |
189 | if (name && strcmp(name, c->map->consumer_dev_name) != 0) | |
190 | continue; | |
191 | chans[mapind].indio_dev = c->indio_dev; | |
192 | chans[mapind].channel = | |
193 | iio_chan_spec_from_name(chans[mapind].indio_dev, | |
194 | c->map->adc_channel_label); | |
195 | if (chans[mapind].channel == NULL) { | |
196 | ret = -EINVAL; | |
197 | put_device(&chans[mapind].indio_dev->dev); | |
198 | goto error_free_chans; | |
199 | } | |
200 | get_device(&chans[mapind].indio_dev->dev); | |
201 | mapind++; | |
202 | } | |
203 | mutex_unlock(&iio_map_list_lock); | |
204 | if (mapind == 0) { | |
205 | ret = -ENODEV; | |
206 | goto error_free_chans; | |
207 | } | |
208 | return chans; | |
209 | ||
210 | error_free_chans: | |
211 | for (i = 0; i < nummaps; i++) | |
212 | if (chans[i].indio_dev) | |
213 | put_device(&chans[i].indio_dev->dev); | |
214 | kfree(chans); | |
215 | error_ret: | |
216 | mutex_unlock(&iio_map_list_lock); | |
217 | ||
218 | return ERR_PTR(ret); | |
219 | } | |
220 | EXPORT_SYMBOL_GPL(iio_st_channel_get_all); | |
221 | ||
222 | void iio_st_channel_release_all(struct iio_channel *channels) | |
223 | { | |
224 | struct iio_channel *chan = &channels[0]; | |
225 | ||
226 | while (chan->indio_dev) { | |
227 | put_device(&chan->indio_dev->dev); | |
228 | chan++; | |
229 | } | |
230 | kfree(channels); | |
231 | } | |
232 | EXPORT_SYMBOL_GPL(iio_st_channel_release_all); | |
233 | ||
234 | int iio_st_read_channel_raw(struct iio_channel *chan, int *val) | |
235 | { | |
236 | int val2, ret; | |
237 | ||
238 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
239 | if (chan->indio_dev->info == NULL) { | |
240 | ret = -ENODEV; | |
241 | goto err_unlock; | |
242 | } | |
243 | ||
244 | ret = chan->indio_dev->info->read_raw(chan->indio_dev, chan->channel, | |
245 | val, &val2, 0); | |
246 | err_unlock: | |
247 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
248 | ||
249 | return ret; | |
250 | } | |
251 | EXPORT_SYMBOL_GPL(iio_st_read_channel_raw); | |
252 | ||
253 | int iio_st_read_channel_scale(struct iio_channel *chan, int *val, int *val2) | |
254 | { | |
255 | int ret; | |
256 | ||
257 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
258 | if (chan->indio_dev->info == NULL) { | |
259 | ret = -ENODEV; | |
260 | goto err_unlock; | |
261 | } | |
262 | ||
263 | ret = chan->indio_dev->info->read_raw(chan->indio_dev, | |
264 | chan->channel, | |
265 | val, val2, | |
266 | IIO_CHAN_INFO_SCALE); | |
267 | err_unlock: | |
268 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
269 | ||
270 | return ret; | |
271 | } | |
272 | EXPORT_SYMBOL_GPL(iio_st_read_channel_scale); | |
273 | ||
274 | int iio_st_get_channel_type(struct iio_channel *chan, | |
275 | enum iio_chan_type *type) | |
276 | { | |
277 | int ret = 0; | |
278 | /* Need to verify underlying driver has not gone away */ | |
279 | ||
280 | mutex_lock(&chan->indio_dev->info_exist_lock); | |
281 | if (chan->indio_dev->info == NULL) { | |
282 | ret = -ENODEV; | |
283 | goto err_unlock; | |
284 | } | |
285 | ||
286 | *type = chan->channel->type; | |
287 | err_unlock: | |
288 | mutex_unlock(&chan->indio_dev->info_exist_lock); | |
289 | ||
290 | return ret; | |
291 | } | |
292 | EXPORT_SYMBOL_GPL(iio_st_get_channel_type); |