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Commit | Line | Data |
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7026ea4b JC |
1 | /* The industrial I/O core |
2 | * | |
3 | * Copyright (c) 2008 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 | * | |
14555b14 | 9 | * Handling of buffer allocation / resizing. |
7026ea4b JC |
10 | * |
11 | * | |
12 | * Things to look at here. | |
13 | * - Better memory allocation techniques? | |
14 | * - Alternative access techniques? | |
15 | */ | |
16 | #include <linux/kernel.h> | |
8e336a72 | 17 | #include <linux/export.h> |
7026ea4b | 18 | #include <linux/device.h> |
7026ea4b | 19 | #include <linux/fs.h> |
7026ea4b | 20 | #include <linux/cdev.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
a7348347 | 22 | #include <linux/poll.h> |
d2f0a48f | 23 | #include <linux/sched.h> |
7026ea4b | 24 | |
06458e27 | 25 | #include <linux/iio/iio.h> |
df9c1c42 | 26 | #include "iio_core.h" |
06458e27 JC |
27 | #include <linux/iio/sysfs.h> |
28 | #include <linux/iio/buffer.h> | |
7026ea4b | 29 | |
8310b86c JC |
30 | static const char * const iio_endian_prefix[] = { |
31 | [IIO_BE] = "be", | |
32 | [IIO_LE] = "le", | |
33 | }; | |
7026ea4b | 34 | |
705ee2c9 | 35 | static bool iio_buffer_is_active(struct iio_buffer *buf) |
84b36ce5 | 36 | { |
705ee2c9 | 37 | return !list_empty(&buf->buffer_list); |
84b36ce5 JC |
38 | } |
39 | ||
647cc7b9 LPC |
40 | static bool iio_buffer_data_available(struct iio_buffer *buf) |
41 | { | |
9dd4694d | 42 | return buf->access->data_available(buf); |
647cc7b9 LPC |
43 | } |
44 | ||
7026ea4b | 45 | /** |
14555b14 | 46 | * iio_buffer_read_first_n_outer() - chrdev read for buffer access |
7026ea4b | 47 | * |
14555b14 JC |
48 | * This function relies on all buffer implementations having an |
49 | * iio_buffer as their first element. | |
7026ea4b | 50 | **/ |
14555b14 JC |
51 | ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf, |
52 | size_t n, loff_t *f_ps) | |
7026ea4b | 53 | { |
1aa04278 | 54 | struct iio_dev *indio_dev = filp->private_data; |
14555b14 | 55 | struct iio_buffer *rb = indio_dev->buffer; |
ee551a10 | 56 | int ret; |
d5857d65 | 57 | |
f18e7a06 LPC |
58 | if (!indio_dev->info) |
59 | return -ENODEV; | |
60 | ||
96e00f11 | 61 | if (!rb || !rb->access->read_first_n) |
7026ea4b | 62 | return -EINVAL; |
ee551a10 LPC |
63 | |
64 | do { | |
65 | if (!iio_buffer_data_available(rb)) { | |
66 | if (filp->f_flags & O_NONBLOCK) | |
67 | return -EAGAIN; | |
68 | ||
69 | ret = wait_event_interruptible(rb->pollq, | |
70 | iio_buffer_data_available(rb) || | |
71 | indio_dev->info == NULL); | |
72 | if (ret) | |
73 | return ret; | |
74 | if (indio_dev->info == NULL) | |
75 | return -ENODEV; | |
76 | } | |
77 | ||
78 | ret = rb->access->read_first_n(rb, n, buf); | |
79 | if (ret == 0 && (filp->f_flags & O_NONBLOCK)) | |
80 | ret = -EAGAIN; | |
81 | } while (ret == 0); | |
82 | ||
83 | return ret; | |
7026ea4b JC |
84 | } |
85 | ||
a7348347 | 86 | /** |
14555b14 | 87 | * iio_buffer_poll() - poll the buffer to find out if it has data |
a7348347 | 88 | */ |
14555b14 JC |
89 | unsigned int iio_buffer_poll(struct file *filp, |
90 | struct poll_table_struct *wait) | |
a7348347 | 91 | { |
1aa04278 | 92 | struct iio_dev *indio_dev = filp->private_data; |
14555b14 | 93 | struct iio_buffer *rb = indio_dev->buffer; |
a7348347 | 94 | |
f18e7a06 LPC |
95 | if (!indio_dev->info) |
96 | return -ENODEV; | |
97 | ||
a7348347 | 98 | poll_wait(filp, &rb->pollq, wait); |
647cc7b9 | 99 | if (iio_buffer_data_available(rb)) |
a7348347 JC |
100 | return POLLIN | POLLRDNORM; |
101 | /* need a way of knowing if there may be enough data... */ | |
8d213f24 | 102 | return 0; |
a7348347 JC |
103 | } |
104 | ||
d2f0a48f LPC |
105 | /** |
106 | * iio_buffer_wakeup_poll - Wakes up the buffer waitqueue | |
107 | * @indio_dev: The IIO device | |
108 | * | |
109 | * Wakes up the event waitqueue used for poll(). Should usually | |
110 | * be called when the device is unregistered. | |
111 | */ | |
112 | void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) | |
113 | { | |
114 | if (!indio_dev->buffer) | |
115 | return; | |
116 | ||
117 | wake_up(&indio_dev->buffer->pollq); | |
118 | } | |
119 | ||
f79a9098 | 120 | void iio_buffer_init(struct iio_buffer *buffer) |
7026ea4b | 121 | { |
5ada4ea9 | 122 | INIT_LIST_HEAD(&buffer->demux_list); |
705ee2c9 | 123 | INIT_LIST_HEAD(&buffer->buffer_list); |
14555b14 | 124 | init_waitqueue_head(&buffer->pollq); |
9e69c935 | 125 | kref_init(&buffer->ref); |
7026ea4b | 126 | } |
14555b14 | 127 | EXPORT_SYMBOL(iio_buffer_init); |
7026ea4b | 128 | |
1d892719 | 129 | static ssize_t iio_show_scan_index(struct device *dev, |
8d213f24 JC |
130 | struct device_attribute *attr, |
131 | char *buf) | |
1d892719 | 132 | { |
8d213f24 | 133 | return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index); |
1d892719 JC |
134 | } |
135 | ||
136 | static ssize_t iio_show_fixed_type(struct device *dev, | |
137 | struct device_attribute *attr, | |
138 | char *buf) | |
139 | { | |
140 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
8310b86c JC |
141 | u8 type = this_attr->c->scan_type.endianness; |
142 | ||
143 | if (type == IIO_CPU) { | |
9d5d1153 JC |
144 | #ifdef __LITTLE_ENDIAN |
145 | type = IIO_LE; | |
146 | #else | |
147 | type = IIO_BE; | |
148 | #endif | |
8310b86c | 149 | } |
0ee8546a SP |
150 | if (this_attr->c->scan_type.repeat > 1) |
151 | return sprintf(buf, "%s:%c%d/%dX%d>>%u\n", | |
152 | iio_endian_prefix[type], | |
153 | this_attr->c->scan_type.sign, | |
154 | this_attr->c->scan_type.realbits, | |
155 | this_attr->c->scan_type.storagebits, | |
156 | this_attr->c->scan_type.repeat, | |
157 | this_attr->c->scan_type.shift); | |
158 | else | |
159 | return sprintf(buf, "%s:%c%d/%d>>%u\n", | |
8310b86c | 160 | iio_endian_prefix[type], |
1d892719 JC |
161 | this_attr->c->scan_type.sign, |
162 | this_attr->c->scan_type.realbits, | |
163 | this_attr->c->scan_type.storagebits, | |
164 | this_attr->c->scan_type.shift); | |
165 | } | |
166 | ||
8d213f24 JC |
167 | static ssize_t iio_scan_el_show(struct device *dev, |
168 | struct device_attribute *attr, | |
169 | char *buf) | |
170 | { | |
171 | int ret; | |
e53f5ac5 | 172 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
8d213f24 | 173 | |
2076a20f AB |
174 | /* Ensure ret is 0 or 1. */ |
175 | ret = !!test_bit(to_iio_dev_attr(attr)->address, | |
5ada4ea9 JC |
176 | indio_dev->buffer->scan_mask); |
177 | ||
8d213f24 JC |
178 | return sprintf(buf, "%d\n", ret); |
179 | } | |
180 | ||
14555b14 | 181 | static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit) |
8d213f24 | 182 | { |
14555b14 | 183 | clear_bit(bit, buffer->scan_mask); |
8d213f24 JC |
184 | return 0; |
185 | } | |
186 | ||
187 | static ssize_t iio_scan_el_store(struct device *dev, | |
188 | struct device_attribute *attr, | |
189 | const char *buf, | |
190 | size_t len) | |
191 | { | |
a714af27 | 192 | int ret; |
8d213f24 | 193 | bool state; |
e53f5ac5 | 194 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 195 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 JC |
196 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
197 | ||
a714af27 JC |
198 | ret = strtobool(buf, &state); |
199 | if (ret < 0) | |
200 | return ret; | |
8d213f24 | 201 | mutex_lock(&indio_dev->mlock); |
705ee2c9 | 202 | if (iio_buffer_is_active(indio_dev->buffer)) { |
8d213f24 JC |
203 | ret = -EBUSY; |
204 | goto error_ret; | |
205 | } | |
f79a9098 | 206 | ret = iio_scan_mask_query(indio_dev, buffer, this_attr->address); |
8d213f24 JC |
207 | if (ret < 0) |
208 | goto error_ret; | |
209 | if (!state && ret) { | |
14555b14 | 210 | ret = iio_scan_mask_clear(buffer, this_attr->address); |
8d213f24 JC |
211 | if (ret) |
212 | goto error_ret; | |
213 | } else if (state && !ret) { | |
f79a9098 | 214 | ret = iio_scan_mask_set(indio_dev, buffer, this_attr->address); |
8d213f24 JC |
215 | if (ret) |
216 | goto error_ret; | |
217 | } | |
218 | ||
219 | error_ret: | |
220 | mutex_unlock(&indio_dev->mlock); | |
221 | ||
5a2a6e11 | 222 | return ret < 0 ? ret : len; |
8d213f24 JC |
223 | |
224 | } | |
225 | ||
226 | static ssize_t iio_scan_el_ts_show(struct device *dev, | |
227 | struct device_attribute *attr, | |
228 | char *buf) | |
229 | { | |
e53f5ac5 | 230 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
f8c6f4e9 | 231 | return sprintf(buf, "%d\n", indio_dev->buffer->scan_timestamp); |
8d213f24 JC |
232 | } |
233 | ||
234 | static ssize_t iio_scan_el_ts_store(struct device *dev, | |
235 | struct device_attribute *attr, | |
236 | const char *buf, | |
237 | size_t len) | |
238 | { | |
a714af27 | 239 | int ret; |
e53f5ac5 | 240 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
8d213f24 | 241 | bool state; |
1aa04278 | 242 | |
a714af27 JC |
243 | ret = strtobool(buf, &state); |
244 | if (ret < 0) | |
245 | return ret; | |
246 | ||
8d213f24 | 247 | mutex_lock(&indio_dev->mlock); |
705ee2c9 | 248 | if (iio_buffer_is_active(indio_dev->buffer)) { |
8d213f24 JC |
249 | ret = -EBUSY; |
250 | goto error_ret; | |
251 | } | |
14555b14 | 252 | indio_dev->buffer->scan_timestamp = state; |
8d213f24 JC |
253 | error_ret: |
254 | mutex_unlock(&indio_dev->mlock); | |
255 | ||
256 | return ret ? ret : len; | |
257 | } | |
258 | ||
14555b14 JC |
259 | static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev, |
260 | const struct iio_chan_spec *chan) | |
1d892719 | 261 | { |
26d25ae3 | 262 | int ret, attrcount = 0; |
14555b14 | 263 | struct iio_buffer *buffer = indio_dev->buffer; |
1d892719 | 264 | |
26d25ae3 | 265 | ret = __iio_add_chan_devattr("index", |
1d892719 JC |
266 | chan, |
267 | &iio_show_scan_index, | |
268 | NULL, | |
269 | 0, | |
3704432f | 270 | IIO_SEPARATE, |
1aa04278 | 271 | &indio_dev->dev, |
14555b14 | 272 | &buffer->scan_el_dev_attr_list); |
1d892719 | 273 | if (ret) |
92825ff9 | 274 | return ret; |
26d25ae3 JC |
275 | attrcount++; |
276 | ret = __iio_add_chan_devattr("type", | |
1d892719 JC |
277 | chan, |
278 | &iio_show_fixed_type, | |
279 | NULL, | |
280 | 0, | |
281 | 0, | |
1aa04278 | 282 | &indio_dev->dev, |
14555b14 | 283 | &buffer->scan_el_dev_attr_list); |
1d892719 | 284 | if (ret) |
92825ff9 | 285 | return ret; |
26d25ae3 | 286 | attrcount++; |
a88b3ebc | 287 | if (chan->type != IIO_TIMESTAMP) |
26d25ae3 | 288 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
289 | chan, |
290 | &iio_scan_el_show, | |
291 | &iio_scan_el_store, | |
292 | chan->scan_index, | |
293 | 0, | |
1aa04278 | 294 | &indio_dev->dev, |
14555b14 | 295 | &buffer->scan_el_dev_attr_list); |
a88b3ebc | 296 | else |
26d25ae3 | 297 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
298 | chan, |
299 | &iio_scan_el_ts_show, | |
300 | &iio_scan_el_ts_store, | |
301 | chan->scan_index, | |
302 | 0, | |
1aa04278 | 303 | &indio_dev->dev, |
14555b14 | 304 | &buffer->scan_el_dev_attr_list); |
9572588c | 305 | if (ret) |
92825ff9 | 306 | return ret; |
26d25ae3 JC |
307 | attrcount++; |
308 | ret = attrcount; | |
1d892719 JC |
309 | return ret; |
310 | } | |
311 | ||
26d25ae3 JC |
312 | static const char * const iio_scan_elements_group_name = "scan_elements"; |
313 | ||
14555b14 JC |
314 | int iio_buffer_register(struct iio_dev *indio_dev, |
315 | const struct iio_chan_spec *channels, | |
316 | int num_channels) | |
1d892719 | 317 | { |
26d25ae3 JC |
318 | struct iio_dev_attr *p; |
319 | struct attribute **attr; | |
14555b14 | 320 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 JC |
321 | int ret, i, attrn, attrcount, attrcount_orig = 0; |
322 | ||
14555b14 JC |
323 | if (buffer->attrs) |
324 | indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs; | |
bf32963c | 325 | |
14555b14 JC |
326 | if (buffer->scan_el_attrs != NULL) { |
327 | attr = buffer->scan_el_attrs->attrs; | |
26d25ae3 JC |
328 | while (*attr++ != NULL) |
329 | attrcount_orig++; | |
330 | } | |
331 | attrcount = attrcount_orig; | |
14555b14 | 332 | INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list); |
1d892719 JC |
333 | if (channels) { |
334 | /* new magic */ | |
335 | for (i = 0; i < num_channels; i++) { | |
f5b81ddd LPC |
336 | if (channels[i].scan_index < 0) |
337 | continue; | |
338 | ||
32b5eeca JC |
339 | /* Establish necessary mask length */ |
340 | if (channels[i].scan_index > | |
341 | (int)indio_dev->masklength - 1) | |
342 | indio_dev->masklength | |
e1dc7bee | 343 | = channels[i].scan_index + 1; |
32b5eeca | 344 | |
14555b14 | 345 | ret = iio_buffer_add_channel_sysfs(indio_dev, |
1aa04278 | 346 | &channels[i]); |
1d892719 | 347 | if (ret < 0) |
26d25ae3 JC |
348 | goto error_cleanup_dynamic; |
349 | attrcount += ret; | |
beb80600 | 350 | if (channels[i].type == IIO_TIMESTAMP) |
f1264809 | 351 | indio_dev->scan_index_timestamp = |
beb80600 | 352 | channels[i].scan_index; |
1d892719 | 353 | } |
14555b14 | 354 | if (indio_dev->masklength && buffer->scan_mask == NULL) { |
d83fb184 TM |
355 | buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), |
356 | sizeof(*buffer->scan_mask), | |
357 | GFP_KERNEL); | |
14555b14 | 358 | if (buffer->scan_mask == NULL) { |
32b5eeca | 359 | ret = -ENOMEM; |
26d25ae3 | 360 | goto error_cleanup_dynamic; |
32b5eeca JC |
361 | } |
362 | } | |
1d892719 JC |
363 | } |
364 | ||
14555b14 | 365 | buffer->scan_el_group.name = iio_scan_elements_group_name; |
26d25ae3 | 366 | |
d83fb184 TM |
367 | buffer->scan_el_group.attrs = kcalloc(attrcount + 1, |
368 | sizeof(buffer->scan_el_group.attrs[0]), | |
369 | GFP_KERNEL); | |
14555b14 | 370 | if (buffer->scan_el_group.attrs == NULL) { |
26d25ae3 JC |
371 | ret = -ENOMEM; |
372 | goto error_free_scan_mask; | |
373 | } | |
14555b14 JC |
374 | if (buffer->scan_el_attrs) |
375 | memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs, | |
376 | sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig); | |
26d25ae3 JC |
377 | attrn = attrcount_orig; |
378 | ||
14555b14 JC |
379 | list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l) |
380 | buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr; | |
381 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group; | |
26d25ae3 | 382 | |
1d892719 | 383 | return 0; |
26d25ae3 JC |
384 | |
385 | error_free_scan_mask: | |
14555b14 | 386 | kfree(buffer->scan_mask); |
1d892719 | 387 | error_cleanup_dynamic: |
84088ebd | 388 | iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list); |
26d25ae3 | 389 | |
7026ea4b JC |
390 | return ret; |
391 | } | |
14555b14 | 392 | EXPORT_SYMBOL(iio_buffer_register); |
1d892719 | 393 | |
14555b14 | 394 | void iio_buffer_unregister(struct iio_dev *indio_dev) |
7026ea4b | 395 | { |
14555b14 JC |
396 | kfree(indio_dev->buffer->scan_mask); |
397 | kfree(indio_dev->buffer->scan_el_group.attrs); | |
84088ebd | 398 | iio_free_chan_devattr_list(&indio_dev->buffer->scan_el_dev_attr_list); |
7026ea4b | 399 | } |
14555b14 | 400 | EXPORT_SYMBOL(iio_buffer_unregister); |
7026ea4b | 401 | |
14555b14 JC |
402 | ssize_t iio_buffer_read_length(struct device *dev, |
403 | struct device_attribute *attr, | |
404 | char *buf) | |
7026ea4b | 405 | { |
e53f5ac5 | 406 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 407 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 408 | |
14555b14 | 409 | if (buffer->access->get_length) |
8d213f24 | 410 | return sprintf(buf, "%d\n", |
14555b14 | 411 | buffer->access->get_length(buffer)); |
7026ea4b | 412 | |
8d213f24 | 413 | return 0; |
7026ea4b | 414 | } |
14555b14 | 415 | EXPORT_SYMBOL(iio_buffer_read_length); |
7026ea4b | 416 | |
14555b14 JC |
417 | ssize_t iio_buffer_write_length(struct device *dev, |
418 | struct device_attribute *attr, | |
419 | const char *buf, | |
420 | size_t len) | |
7026ea4b | 421 | { |
e53f5ac5 | 422 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 423 | struct iio_buffer *buffer = indio_dev->buffer; |
948ad205 LPC |
424 | unsigned int val; |
425 | int ret; | |
8d213f24 | 426 | |
948ad205 | 427 | ret = kstrtouint(buf, 10, &val); |
7026ea4b JC |
428 | if (ret) |
429 | return ret; | |
430 | ||
14555b14 JC |
431 | if (buffer->access->get_length) |
432 | if (val == buffer->access->get_length(buffer)) | |
7026ea4b JC |
433 | return len; |
434 | ||
e38c79e0 | 435 | mutex_lock(&indio_dev->mlock); |
705ee2c9 | 436 | if (iio_buffer_is_active(indio_dev->buffer)) { |
e38c79e0 LPC |
437 | ret = -EBUSY; |
438 | } else { | |
869871b5 | 439 | if (buffer->access->set_length) |
e38c79e0 | 440 | buffer->access->set_length(buffer, val); |
e38c79e0 | 441 | ret = 0; |
7026ea4b | 442 | } |
e38c79e0 | 443 | mutex_unlock(&indio_dev->mlock); |
7026ea4b | 444 | |
e38c79e0 | 445 | return ret ? ret : len; |
7026ea4b | 446 | } |
14555b14 | 447 | EXPORT_SYMBOL(iio_buffer_write_length); |
7026ea4b | 448 | |
14555b14 JC |
449 | ssize_t iio_buffer_show_enable(struct device *dev, |
450 | struct device_attribute *attr, | |
451 | char *buf) | |
7026ea4b | 452 | { |
e53f5ac5 | 453 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
705ee2c9 | 454 | return sprintf(buf, "%d\n", iio_buffer_is_active(indio_dev->buffer)); |
7026ea4b | 455 | } |
14555b14 | 456 | EXPORT_SYMBOL(iio_buffer_show_enable); |
7026ea4b | 457 | |
9572588c | 458 | /* Note NULL used as error indicator as it doesn't make sense. */ |
cd4361c7 | 459 | static const unsigned long *iio_scan_mask_match(const unsigned long *av_masks, |
32b5eeca | 460 | unsigned int masklength, |
cd4361c7 | 461 | const unsigned long *mask) |
32b5eeca JC |
462 | { |
463 | if (bitmap_empty(mask, masklength)) | |
464 | return NULL; | |
465 | while (*av_masks) { | |
466 | if (bitmap_subset(mask, av_masks, masklength)) | |
467 | return av_masks; | |
468 | av_masks += BITS_TO_LONGS(masklength); | |
469 | } | |
470 | return NULL; | |
471 | } | |
472 | ||
183f4173 PM |
473 | static int iio_compute_scan_bytes(struct iio_dev *indio_dev, |
474 | const unsigned long *mask, bool timestamp) | |
959d2952 | 475 | { |
959d2952 JC |
476 | const struct iio_chan_spec *ch; |
477 | unsigned bytes = 0; | |
478 | int length, i; | |
959d2952 JC |
479 | |
480 | /* How much space will the demuxed element take? */ | |
6b3b58ed | 481 | for_each_set_bit(i, mask, |
959d2952 JC |
482 | indio_dev->masklength) { |
483 | ch = iio_find_channel_from_si(indio_dev, i); | |
0ee8546a SP |
484 | if (ch->scan_type.repeat > 1) |
485 | length = ch->scan_type.storagebits / 8 * | |
486 | ch->scan_type.repeat; | |
487 | else | |
488 | length = ch->scan_type.storagebits / 8; | |
959d2952 JC |
489 | bytes = ALIGN(bytes, length); |
490 | bytes += length; | |
491 | } | |
6b3b58ed | 492 | if (timestamp) { |
959d2952 | 493 | ch = iio_find_channel_from_si(indio_dev, |
f1264809 | 494 | indio_dev->scan_index_timestamp); |
0ee8546a SP |
495 | if (ch->scan_type.repeat > 1) |
496 | length = ch->scan_type.storagebits / 8 * | |
497 | ch->scan_type.repeat; | |
498 | else | |
499 | length = ch->scan_type.storagebits / 8; | |
959d2952 JC |
500 | bytes = ALIGN(bytes, length); |
501 | bytes += length; | |
502 | } | |
6b3b58ed JC |
503 | return bytes; |
504 | } | |
505 | ||
9e69c935 LPC |
506 | static void iio_buffer_activate(struct iio_dev *indio_dev, |
507 | struct iio_buffer *buffer) | |
508 | { | |
509 | iio_buffer_get(buffer); | |
510 | list_add(&buffer->buffer_list, &indio_dev->buffer_list); | |
511 | } | |
512 | ||
513 | static void iio_buffer_deactivate(struct iio_buffer *buffer) | |
514 | { | |
515 | list_del_init(&buffer->buffer_list); | |
516 | iio_buffer_put(buffer); | |
517 | } | |
518 | ||
a87c82e4 LPC |
519 | void iio_disable_all_buffers(struct iio_dev *indio_dev) |
520 | { | |
521 | struct iio_buffer *buffer, *_buffer; | |
522 | ||
523 | if (list_empty(&indio_dev->buffer_list)) | |
524 | return; | |
525 | ||
526 | if (indio_dev->setup_ops->predisable) | |
527 | indio_dev->setup_ops->predisable(indio_dev); | |
528 | ||
529 | list_for_each_entry_safe(buffer, _buffer, | |
530 | &indio_dev->buffer_list, buffer_list) | |
9e69c935 | 531 | iio_buffer_deactivate(buffer); |
a87c82e4 LPC |
532 | |
533 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
534 | if (indio_dev->setup_ops->postdisable) | |
535 | indio_dev->setup_ops->postdisable(indio_dev); | |
e086ed76 LPC |
536 | |
537 | if (indio_dev->available_scan_masks == NULL) | |
538 | kfree(indio_dev->active_scan_mask); | |
a87c82e4 LPC |
539 | } |
540 | ||
8e050996 LPC |
541 | static void iio_buffer_update_bytes_per_datum(struct iio_dev *indio_dev, |
542 | struct iio_buffer *buffer) | |
543 | { | |
544 | unsigned int bytes; | |
545 | ||
546 | if (!buffer->access->set_bytes_per_datum) | |
547 | return; | |
548 | ||
549 | bytes = iio_compute_scan_bytes(indio_dev, buffer->scan_mask, | |
550 | buffer->scan_timestamp); | |
551 | ||
552 | buffer->access->set_bytes_per_datum(buffer, bytes); | |
553 | } | |
554 | ||
a9519456 | 555 | static int __iio_update_buffers(struct iio_dev *indio_dev, |
84b36ce5 JC |
556 | struct iio_buffer *insert_buffer, |
557 | struct iio_buffer *remove_buffer) | |
6b3b58ed | 558 | { |
84b36ce5 JC |
559 | int ret; |
560 | int success = 0; | |
561 | struct iio_buffer *buffer; | |
562 | unsigned long *compound_mask; | |
563 | const unsigned long *old_mask; | |
6b3b58ed | 564 | |
84b36ce5 JC |
565 | /* Wind down existing buffers - iff there are any */ |
566 | if (!list_empty(&indio_dev->buffer_list)) { | |
567 | if (indio_dev->setup_ops->predisable) { | |
568 | ret = indio_dev->setup_ops->predisable(indio_dev); | |
569 | if (ret) | |
92825ff9 | 570 | return ret; |
84b36ce5 JC |
571 | } |
572 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
573 | if (indio_dev->setup_ops->postdisable) { | |
574 | ret = indio_dev->setup_ops->postdisable(indio_dev); | |
575 | if (ret) | |
92825ff9 | 576 | return ret; |
84b36ce5 JC |
577 | } |
578 | } | |
579 | /* Keep a copy of current setup to allow roll back */ | |
580 | old_mask = indio_dev->active_scan_mask; | |
581 | if (!indio_dev->available_scan_masks) | |
582 | indio_dev->active_scan_mask = NULL; | |
583 | ||
584 | if (remove_buffer) | |
9e69c935 | 585 | iio_buffer_deactivate(remove_buffer); |
84b36ce5 | 586 | if (insert_buffer) |
9e69c935 | 587 | iio_buffer_activate(indio_dev, insert_buffer); |
84b36ce5 JC |
588 | |
589 | /* If no buffers in list, we are done */ | |
590 | if (list_empty(&indio_dev->buffer_list)) { | |
591 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
592 | if (indio_dev->available_scan_masks == NULL) | |
593 | kfree(old_mask); | |
594 | return 0; | |
595 | } | |
959d2952 | 596 | |
9572588c | 597 | /* What scan mask do we actually have? */ |
84b36ce5 JC |
598 | compound_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), |
599 | sizeof(long), GFP_KERNEL); | |
600 | if (compound_mask == NULL) { | |
601 | if (indio_dev->available_scan_masks == NULL) | |
602 | kfree(old_mask); | |
603 | return -ENOMEM; | |
604 | } | |
605 | indio_dev->scan_timestamp = 0; | |
606 | ||
607 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { | |
608 | bitmap_or(compound_mask, compound_mask, buffer->scan_mask, | |
609 | indio_dev->masklength); | |
610 | indio_dev->scan_timestamp |= buffer->scan_timestamp; | |
611 | } | |
612 | if (indio_dev->available_scan_masks) { | |
959d2952 JC |
613 | indio_dev->active_scan_mask = |
614 | iio_scan_mask_match(indio_dev->available_scan_masks, | |
615 | indio_dev->masklength, | |
84b36ce5 JC |
616 | compound_mask); |
617 | if (indio_dev->active_scan_mask == NULL) { | |
618 | /* | |
619 | * Roll back. | |
620 | * Note can only occur when adding a buffer. | |
621 | */ | |
9e69c935 | 622 | iio_buffer_deactivate(insert_buffer); |
d66e0452 PM |
623 | if (old_mask) { |
624 | indio_dev->active_scan_mask = old_mask; | |
625 | success = -EINVAL; | |
626 | } | |
627 | else { | |
628 | kfree(compound_mask); | |
629 | ret = -EINVAL; | |
92825ff9 | 630 | return ret; |
d66e0452 | 631 | } |
84b36ce5 JC |
632 | } |
633 | } else { | |
634 | indio_dev->active_scan_mask = compound_mask; | |
635 | } | |
aff1eb4e | 636 | |
5ada4ea9 JC |
637 | iio_update_demux(indio_dev); |
638 | ||
84b36ce5 JC |
639 | /* Wind up again */ |
640 | if (indio_dev->setup_ops->preenable) { | |
641 | ret = indio_dev->setup_ops->preenable(indio_dev); | |
642 | if (ret) { | |
643 | printk(KERN_ERR | |
bec1889d | 644 | "Buffer not started: buffer preenable failed (%d)\n", ret); |
84b36ce5 JC |
645 | goto error_remove_inserted; |
646 | } | |
647 | } | |
648 | indio_dev->scan_bytes = | |
649 | iio_compute_scan_bytes(indio_dev, | |
650 | indio_dev->active_scan_mask, | |
651 | indio_dev->scan_timestamp); | |
8e050996 LPC |
652 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { |
653 | iio_buffer_update_bytes_per_datum(indio_dev, buffer); | |
84b36ce5 JC |
654 | if (buffer->access->request_update) { |
655 | ret = buffer->access->request_update(buffer); | |
656 | if (ret) { | |
657 | printk(KERN_INFO | |
bec1889d | 658 | "Buffer not started: buffer parameter update failed (%d)\n", ret); |
84b36ce5 JC |
659 | goto error_run_postdisable; |
660 | } | |
661 | } | |
8e050996 | 662 | } |
84b36ce5 JC |
663 | if (indio_dev->info->update_scan_mode) { |
664 | ret = indio_dev->info | |
5ada4ea9 JC |
665 | ->update_scan_mode(indio_dev, |
666 | indio_dev->active_scan_mask); | |
84b36ce5 | 667 | if (ret < 0) { |
bec1889d | 668 | printk(KERN_INFO "Buffer not started: update scan mode failed (%d)\n", ret); |
84b36ce5 JC |
669 | goto error_run_postdisable; |
670 | } | |
671 | } | |
9572588c | 672 | /* Definitely possible for devices to support both of these. */ |
84b36ce5 JC |
673 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) { |
674 | if (!indio_dev->trig) { | |
675 | printk(KERN_INFO "Buffer not started: no trigger\n"); | |
676 | ret = -EINVAL; | |
677 | /* Can only occur on first buffer */ | |
678 | goto error_run_postdisable; | |
679 | } | |
680 | indio_dev->currentmode = INDIO_BUFFER_TRIGGERED; | |
681 | } else if (indio_dev->modes & INDIO_BUFFER_HARDWARE) { | |
682 | indio_dev->currentmode = INDIO_BUFFER_HARDWARE; | |
9572588c | 683 | } else { /* Should never be reached */ |
84b36ce5 JC |
684 | ret = -EINVAL; |
685 | goto error_run_postdisable; | |
686 | } | |
687 | ||
688 | if (indio_dev->setup_ops->postenable) { | |
689 | ret = indio_dev->setup_ops->postenable(indio_dev); | |
690 | if (ret) { | |
691 | printk(KERN_INFO | |
bec1889d | 692 | "Buffer not started: postenable failed (%d)\n", ret); |
84b36ce5 JC |
693 | indio_dev->currentmode = INDIO_DIRECT_MODE; |
694 | if (indio_dev->setup_ops->postdisable) | |
695 | indio_dev->setup_ops->postdisable(indio_dev); | |
696 | goto error_disable_all_buffers; | |
697 | } | |
698 | } | |
699 | ||
700 | if (indio_dev->available_scan_masks) | |
701 | kfree(compound_mask); | |
702 | else | |
703 | kfree(old_mask); | |
704 | ||
705 | return success; | |
706 | ||
707 | error_disable_all_buffers: | |
708 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
709 | error_run_postdisable: | |
710 | if (indio_dev->setup_ops->postdisable) | |
711 | indio_dev->setup_ops->postdisable(indio_dev); | |
712 | error_remove_inserted: | |
84b36ce5 | 713 | if (insert_buffer) |
9e69c935 | 714 | iio_buffer_deactivate(insert_buffer); |
84b36ce5 JC |
715 | indio_dev->active_scan_mask = old_mask; |
716 | kfree(compound_mask); | |
84b36ce5 JC |
717 | return ret; |
718 | } | |
a9519456 LPC |
719 | |
720 | int iio_update_buffers(struct iio_dev *indio_dev, | |
721 | struct iio_buffer *insert_buffer, | |
722 | struct iio_buffer *remove_buffer) | |
723 | { | |
724 | int ret; | |
725 | ||
3909fab5 LPC |
726 | if (insert_buffer == remove_buffer) |
727 | return 0; | |
728 | ||
a9519456 LPC |
729 | mutex_lock(&indio_dev->info_exist_lock); |
730 | mutex_lock(&indio_dev->mlock); | |
731 | ||
3909fab5 LPC |
732 | if (insert_buffer && iio_buffer_is_active(insert_buffer)) |
733 | insert_buffer = NULL; | |
734 | ||
735 | if (remove_buffer && !iio_buffer_is_active(remove_buffer)) | |
736 | remove_buffer = NULL; | |
737 | ||
738 | if (!insert_buffer && !remove_buffer) { | |
739 | ret = 0; | |
740 | goto out_unlock; | |
741 | } | |
742 | ||
a9519456 LPC |
743 | if (indio_dev->info == NULL) { |
744 | ret = -ENODEV; | |
745 | goto out_unlock; | |
746 | } | |
747 | ||
748 | ret = __iio_update_buffers(indio_dev, insert_buffer, remove_buffer); | |
749 | ||
750 | out_unlock: | |
751 | mutex_unlock(&indio_dev->mlock); | |
752 | mutex_unlock(&indio_dev->info_exist_lock); | |
753 | ||
754 | return ret; | |
755 | } | |
84b36ce5 JC |
756 | EXPORT_SYMBOL_GPL(iio_update_buffers); |
757 | ||
758 | ssize_t iio_buffer_store_enable(struct device *dev, | |
759 | struct device_attribute *attr, | |
760 | const char *buf, | |
761 | size_t len) | |
762 | { | |
763 | int ret; | |
764 | bool requested_state; | |
765 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
84b36ce5 JC |
766 | bool inlist; |
767 | ||
768 | ret = strtobool(buf, &requested_state); | |
769 | if (ret < 0) | |
770 | return ret; | |
771 | ||
772 | mutex_lock(&indio_dev->mlock); | |
773 | ||
774 | /* Find out if it is in the list */ | |
705ee2c9 | 775 | inlist = iio_buffer_is_active(indio_dev->buffer); |
84b36ce5 JC |
776 | /* Already in desired state */ |
777 | if (inlist == requested_state) | |
778 | goto done; | |
779 | ||
780 | if (requested_state) | |
a9519456 | 781 | ret = __iio_update_buffers(indio_dev, |
84b36ce5 JC |
782 | indio_dev->buffer, NULL); |
783 | else | |
a9519456 | 784 | ret = __iio_update_buffers(indio_dev, |
84b36ce5 JC |
785 | NULL, indio_dev->buffer); |
786 | ||
787 | if (ret < 0) | |
788 | goto done; | |
789 | done: | |
790 | mutex_unlock(&indio_dev->mlock); | |
791 | return (ret < 0) ? ret : len; | |
792 | } | |
793 | EXPORT_SYMBOL(iio_buffer_store_enable); | |
794 | ||
81636632 LPC |
795 | /** |
796 | * iio_validate_scan_mask_onehot() - Validates that exactly one channel is selected | |
797 | * @indio_dev: the iio device | |
798 | * @mask: scan mask to be checked | |
799 | * | |
800 | * Return true if exactly one bit is set in the scan mask, false otherwise. It | |
801 | * can be used for devices where only one channel can be active for sampling at | |
802 | * a time. | |
803 | */ | |
804 | bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev, | |
805 | const unsigned long *mask) | |
806 | { | |
807 | return bitmap_weight(mask, indio_dev->masklength) == 1; | |
808 | } | |
809 | EXPORT_SYMBOL_GPL(iio_validate_scan_mask_onehot); | |
810 | ||
939546d1 LPC |
811 | static bool iio_validate_scan_mask(struct iio_dev *indio_dev, |
812 | const unsigned long *mask) | |
813 | { | |
814 | if (!indio_dev->setup_ops->validate_scan_mask) | |
815 | return true; | |
816 | ||
817 | return indio_dev->setup_ops->validate_scan_mask(indio_dev, mask); | |
818 | } | |
819 | ||
32b5eeca JC |
820 | /** |
821 | * iio_scan_mask_set() - set particular bit in the scan mask | |
9572588c | 822 | * @indio_dev: the iio device |
14555b14 | 823 | * @buffer: the buffer whose scan mask we are interested in |
32b5eeca | 824 | * @bit: the bit to be set. |
84b36ce5 JC |
825 | * |
826 | * Note that at this point we have no way of knowing what other | |
827 | * buffers might request, hence this code only verifies that the | |
828 | * individual buffers request is plausible. | |
829 | */ | |
f79a9098 JC |
830 | int iio_scan_mask_set(struct iio_dev *indio_dev, |
831 | struct iio_buffer *buffer, int bit) | |
32b5eeca | 832 | { |
cd4361c7 | 833 | const unsigned long *mask; |
32b5eeca JC |
834 | unsigned long *trialmask; |
835 | ||
836 | trialmask = kmalloc(sizeof(*trialmask)* | |
f8c6f4e9 | 837 | BITS_TO_LONGS(indio_dev->masklength), |
32b5eeca JC |
838 | GFP_KERNEL); |
839 | ||
840 | if (trialmask == NULL) | |
841 | return -ENOMEM; | |
f8c6f4e9 | 842 | if (!indio_dev->masklength) { |
9572588c | 843 | WARN_ON("Trying to set scanmask prior to registering buffer\n"); |
939546d1 | 844 | goto err_invalid_mask; |
32b5eeca | 845 | } |
f8c6f4e9 | 846 | bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength); |
32b5eeca JC |
847 | set_bit(bit, trialmask); |
848 | ||
939546d1 LPC |
849 | if (!iio_validate_scan_mask(indio_dev, trialmask)) |
850 | goto err_invalid_mask; | |
851 | ||
f8c6f4e9 JC |
852 | if (indio_dev->available_scan_masks) { |
853 | mask = iio_scan_mask_match(indio_dev->available_scan_masks, | |
854 | indio_dev->masklength, | |
32b5eeca | 855 | trialmask); |
939546d1 LPC |
856 | if (!mask) |
857 | goto err_invalid_mask; | |
32b5eeca | 858 | } |
f8c6f4e9 | 859 | bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength); |
32b5eeca JC |
860 | |
861 | kfree(trialmask); | |
862 | ||
863 | return 0; | |
939546d1 LPC |
864 | |
865 | err_invalid_mask: | |
866 | kfree(trialmask); | |
867 | return -EINVAL; | |
868 | } | |
32b5eeca JC |
869 | EXPORT_SYMBOL_GPL(iio_scan_mask_set); |
870 | ||
f79a9098 JC |
871 | int iio_scan_mask_query(struct iio_dev *indio_dev, |
872 | struct iio_buffer *buffer, int bit) | |
32b5eeca | 873 | { |
f8c6f4e9 | 874 | if (bit > indio_dev->masklength) |
32b5eeca JC |
875 | return -EINVAL; |
876 | ||
14555b14 | 877 | if (!buffer->scan_mask) |
32b5eeca | 878 | return 0; |
32b5eeca | 879 | |
2076a20f AB |
880 | /* Ensure return value is 0 or 1. */ |
881 | return !!test_bit(bit, buffer->scan_mask); | |
32b5eeca JC |
882 | }; |
883 | EXPORT_SYMBOL_GPL(iio_scan_mask_query); | |
5ada4ea9 JC |
884 | |
885 | /** | |
886 | * struct iio_demux_table() - table describing demux memcpy ops | |
887 | * @from: index to copy from | |
99698b45 | 888 | * @to: index to copy to |
5ada4ea9 JC |
889 | * @length: how many bytes to copy |
890 | * @l: list head used for management | |
891 | */ | |
892 | struct iio_demux_table { | |
893 | unsigned from; | |
894 | unsigned to; | |
895 | unsigned length; | |
896 | struct list_head l; | |
897 | }; | |
898 | ||
5d65d920 LPC |
899 | static const void *iio_demux(struct iio_buffer *buffer, |
900 | const void *datain) | |
5ada4ea9 JC |
901 | { |
902 | struct iio_demux_table *t; | |
903 | ||
904 | if (list_empty(&buffer->demux_list)) | |
905 | return datain; | |
906 | list_for_each_entry(t, &buffer->demux_list, l) | |
907 | memcpy(buffer->demux_bounce + t->to, | |
908 | datain + t->from, t->length); | |
909 | ||
910 | return buffer->demux_bounce; | |
911 | } | |
912 | ||
5d65d920 | 913 | static int iio_push_to_buffer(struct iio_buffer *buffer, const void *data) |
5ada4ea9 | 914 | { |
5d65d920 | 915 | const void *dataout = iio_demux(buffer, data); |
5ada4ea9 | 916 | |
ce56ade6 | 917 | return buffer->access->store_to(buffer, dataout); |
5ada4ea9 | 918 | } |
5ada4ea9 | 919 | |
842cd100 JC |
920 | static void iio_buffer_demux_free(struct iio_buffer *buffer) |
921 | { | |
922 | struct iio_demux_table *p, *q; | |
923 | list_for_each_entry_safe(p, q, &buffer->demux_list, l) { | |
924 | list_del(&p->l); | |
925 | kfree(p); | |
926 | } | |
927 | } | |
928 | ||
84b36ce5 | 929 | |
5d65d920 | 930 | int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data) |
84b36ce5 JC |
931 | { |
932 | int ret; | |
933 | struct iio_buffer *buf; | |
934 | ||
935 | list_for_each_entry(buf, &indio_dev->buffer_list, buffer_list) { | |
936 | ret = iio_push_to_buffer(buf, data); | |
937 | if (ret < 0) | |
938 | return ret; | |
939 | } | |
940 | ||
941 | return 0; | |
942 | } | |
943 | EXPORT_SYMBOL_GPL(iio_push_to_buffers); | |
944 | ||
cbe88bcc LPC |
945 | static int iio_buffer_add_demux(struct iio_buffer *buffer, |
946 | struct iio_demux_table **p, unsigned int in_loc, unsigned int out_loc, | |
947 | unsigned int length) | |
948 | { | |
949 | ||
950 | if (*p && (*p)->from + (*p)->length == in_loc && | |
951 | (*p)->to + (*p)->length == out_loc) { | |
952 | (*p)->length += length; | |
953 | } else { | |
7cdca178 | 954 | *p = kmalloc(sizeof(**p), GFP_KERNEL); |
cbe88bcc LPC |
955 | if (*p == NULL) |
956 | return -ENOMEM; | |
957 | (*p)->from = in_loc; | |
958 | (*p)->to = out_loc; | |
959 | (*p)->length = length; | |
960 | list_add_tail(&(*p)->l, &buffer->demux_list); | |
961 | } | |
962 | ||
963 | return 0; | |
964 | } | |
965 | ||
84b36ce5 JC |
966 | static int iio_buffer_update_demux(struct iio_dev *indio_dev, |
967 | struct iio_buffer *buffer) | |
5ada4ea9 JC |
968 | { |
969 | const struct iio_chan_spec *ch; | |
5ada4ea9 JC |
970 | int ret, in_ind = -1, out_ind, length; |
971 | unsigned in_loc = 0, out_loc = 0; | |
cbe88bcc | 972 | struct iio_demux_table *p = NULL; |
5ada4ea9 JC |
973 | |
974 | /* Clear out any old demux */ | |
842cd100 | 975 | iio_buffer_demux_free(buffer); |
5ada4ea9 JC |
976 | kfree(buffer->demux_bounce); |
977 | buffer->demux_bounce = NULL; | |
978 | ||
979 | /* First work out which scan mode we will actually have */ | |
980 | if (bitmap_equal(indio_dev->active_scan_mask, | |
981 | buffer->scan_mask, | |
982 | indio_dev->masklength)) | |
983 | return 0; | |
984 | ||
985 | /* Now we have the two masks, work from least sig and build up sizes */ | |
986 | for_each_set_bit(out_ind, | |
61bd55ce | 987 | buffer->scan_mask, |
5ada4ea9 JC |
988 | indio_dev->masklength) { |
989 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
990 | indio_dev->masklength, | |
991 | in_ind + 1); | |
992 | while (in_ind != out_ind) { | |
993 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
994 | indio_dev->masklength, | |
995 | in_ind + 1); | |
996 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
0ee8546a SP |
997 | if (ch->scan_type.repeat > 1) |
998 | length = ch->scan_type.storagebits / 8 * | |
999 | ch->scan_type.repeat; | |
1000 | else | |
1001 | length = ch->scan_type.storagebits / 8; | |
5ada4ea9 | 1002 | /* Make sure we are aligned */ |
61072dbc | 1003 | in_loc = roundup(in_loc, length) + length; |
5ada4ea9 JC |
1004 | } |
1005 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
0ee8546a SP |
1006 | if (ch->scan_type.repeat > 1) |
1007 | length = ch->scan_type.storagebits / 8 * | |
1008 | ch->scan_type.repeat; | |
1009 | else | |
1010 | length = ch->scan_type.storagebits / 8; | |
61072dbc LPC |
1011 | out_loc = roundup(out_loc, length); |
1012 | in_loc = roundup(in_loc, length); | |
cbe88bcc LPC |
1013 | ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length); |
1014 | if (ret) | |
1015 | goto error_clear_mux_table; | |
5ada4ea9 JC |
1016 | out_loc += length; |
1017 | in_loc += length; | |
1018 | } | |
1019 | /* Relies on scan_timestamp being last */ | |
1020 | if (buffer->scan_timestamp) { | |
5ada4ea9 | 1021 | ch = iio_find_channel_from_si(indio_dev, |
f1264809 | 1022 | indio_dev->scan_index_timestamp); |
0ee8546a SP |
1023 | if (ch->scan_type.repeat > 1) |
1024 | length = ch->scan_type.storagebits / 8 * | |
1025 | ch->scan_type.repeat; | |
1026 | else | |
1027 | length = ch->scan_type.storagebits / 8; | |
61072dbc LPC |
1028 | out_loc = roundup(out_loc, length); |
1029 | in_loc = roundup(in_loc, length); | |
cbe88bcc LPC |
1030 | ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length); |
1031 | if (ret) | |
1032 | goto error_clear_mux_table; | |
5ada4ea9 JC |
1033 | out_loc += length; |
1034 | in_loc += length; | |
1035 | } | |
1036 | buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL); | |
1037 | if (buffer->demux_bounce == NULL) { | |
1038 | ret = -ENOMEM; | |
1039 | goto error_clear_mux_table; | |
1040 | } | |
1041 | return 0; | |
1042 | ||
1043 | error_clear_mux_table: | |
842cd100 JC |
1044 | iio_buffer_demux_free(buffer); |
1045 | ||
5ada4ea9 JC |
1046 | return ret; |
1047 | } | |
84b36ce5 JC |
1048 | |
1049 | int iio_update_demux(struct iio_dev *indio_dev) | |
1050 | { | |
1051 | struct iio_buffer *buffer; | |
1052 | int ret; | |
1053 | ||
1054 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { | |
1055 | ret = iio_buffer_update_demux(indio_dev, buffer); | |
1056 | if (ret < 0) | |
1057 | goto error_clear_mux_table; | |
1058 | } | |
1059 | return 0; | |
1060 | ||
1061 | error_clear_mux_table: | |
1062 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) | |
1063 | iio_buffer_demux_free(buffer); | |
1064 | ||
1065 | return ret; | |
1066 | } | |
5ada4ea9 | 1067 | EXPORT_SYMBOL_GPL(iio_update_demux); |
9e69c935 LPC |
1068 | |
1069 | /** | |
1070 | * iio_buffer_release() - Free a buffer's resources | |
1071 | * @ref: Pointer to the kref embedded in the iio_buffer struct | |
1072 | * | |
1073 | * This function is called when the last reference to the buffer has been | |
1074 | * dropped. It will typically free all resources allocated by the buffer. Do not | |
1075 | * call this function manually, always use iio_buffer_put() when done using a | |
1076 | * buffer. | |
1077 | */ | |
1078 | static void iio_buffer_release(struct kref *ref) | |
1079 | { | |
1080 | struct iio_buffer *buffer = container_of(ref, struct iio_buffer, ref); | |
1081 | ||
1082 | buffer->access->release(buffer); | |
1083 | } | |
1084 | ||
1085 | /** | |
1086 | * iio_buffer_get() - Grab a reference to the buffer | |
1087 | * @buffer: The buffer to grab a reference for, may be NULL | |
1088 | * | |
1089 | * Returns the pointer to the buffer that was passed into the function. | |
1090 | */ | |
1091 | struct iio_buffer *iio_buffer_get(struct iio_buffer *buffer) | |
1092 | { | |
1093 | if (buffer) | |
1094 | kref_get(&buffer->ref); | |
1095 | ||
1096 | return buffer; | |
1097 | } | |
1098 | EXPORT_SYMBOL_GPL(iio_buffer_get); | |
1099 | ||
1100 | /** | |
1101 | * iio_buffer_put() - Release the reference to the buffer | |
1102 | * @buffer: The buffer to release the reference for, may be NULL | |
1103 | */ | |
1104 | void iio_buffer_put(struct iio_buffer *buffer) | |
1105 | { | |
1106 | if (buffer) | |
1107 | kref_put(&buffer->ref, iio_buffer_release); | |
1108 | } | |
1109 | EXPORT_SYMBOL_GPL(iio_buffer_put); |