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 | ||
37d34556 | 40 | static size_t iio_buffer_data_available(struct iio_buffer *buf) |
647cc7b9 | 41 | { |
9dd4694d | 42 | return buf->access->data_available(buf); |
647cc7b9 LPC |
43 | } |
44 | ||
37d34556 JC |
45 | static bool iio_buffer_ready(struct iio_dev *indio_dev, struct iio_buffer *buf, |
46 | size_t to_wait) | |
47 | { | |
48 | /* wakeup if the device was unregistered */ | |
49 | if (!indio_dev->info) | |
50 | return true; | |
51 | ||
52 | /* drain the buffer if it was disabled */ | |
53 | if (!iio_buffer_is_active(buf)) | |
54 | to_wait = min_t(size_t, to_wait, 1); | |
55 | ||
56 | if (iio_buffer_data_available(buf) >= to_wait) | |
57 | return true; | |
58 | ||
59 | return false; | |
60 | } | |
61 | ||
7026ea4b | 62 | /** |
14555b14 | 63 | * iio_buffer_read_first_n_outer() - chrdev read for buffer access |
7026ea4b | 64 | * |
14555b14 JC |
65 | * This function relies on all buffer implementations having an |
66 | * iio_buffer as their first element. | |
7026ea4b | 67 | **/ |
14555b14 JC |
68 | ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf, |
69 | size_t n, loff_t *f_ps) | |
7026ea4b | 70 | { |
1aa04278 | 71 | struct iio_dev *indio_dev = filp->private_data; |
14555b14 | 72 | struct iio_buffer *rb = indio_dev->buffer; |
37d34556 JC |
73 | size_t datum_size; |
74 | size_t to_wait = 0; | |
ee551a10 | 75 | int ret; |
d5857d65 | 76 | |
f18e7a06 LPC |
77 | if (!indio_dev->info) |
78 | return -ENODEV; | |
79 | ||
96e00f11 | 80 | if (!rb || !rb->access->read_first_n) |
7026ea4b | 81 | return -EINVAL; |
ee551a10 | 82 | |
37d34556 JC |
83 | datum_size = rb->bytes_per_datum; |
84 | ||
85 | /* | |
86 | * If datum_size is 0 there will never be anything to read from the | |
87 | * buffer, so signal end of file now. | |
88 | */ | |
89 | if (!datum_size) | |
90 | return 0; | |
91 | ||
92 | if (!(filp->f_flags & O_NONBLOCK)) | |
93 | to_wait = min_t(size_t, n / datum_size, rb->watermark); | |
94 | ||
ee551a10 | 95 | do { |
37d34556 JC |
96 | ret = wait_event_interruptible(rb->pollq, |
97 | iio_buffer_ready(indio_dev, rb, to_wait)); | |
98 | if (ret) | |
99 | return ret; | |
ee551a10 | 100 | |
37d34556 JC |
101 | if (!indio_dev->info) |
102 | return -ENODEV; | |
ee551a10 LPC |
103 | |
104 | ret = rb->access->read_first_n(rb, n, buf); | |
105 | if (ret == 0 && (filp->f_flags & O_NONBLOCK)) | |
106 | ret = -EAGAIN; | |
107 | } while (ret == 0); | |
108 | ||
109 | return ret; | |
7026ea4b JC |
110 | } |
111 | ||
a7348347 | 112 | /** |
14555b14 | 113 | * iio_buffer_poll() - poll the buffer to find out if it has data |
a7348347 | 114 | */ |
14555b14 JC |
115 | unsigned int iio_buffer_poll(struct file *filp, |
116 | struct poll_table_struct *wait) | |
a7348347 | 117 | { |
1aa04278 | 118 | struct iio_dev *indio_dev = filp->private_data; |
14555b14 | 119 | struct iio_buffer *rb = indio_dev->buffer; |
a7348347 | 120 | |
f18e7a06 LPC |
121 | if (!indio_dev->info) |
122 | return -ENODEV; | |
123 | ||
a7348347 | 124 | poll_wait(filp, &rb->pollq, wait); |
37d34556 | 125 | if (iio_buffer_ready(indio_dev, rb, rb->watermark)) |
a7348347 | 126 | return POLLIN | POLLRDNORM; |
8d213f24 | 127 | return 0; |
a7348347 JC |
128 | } |
129 | ||
d2f0a48f LPC |
130 | /** |
131 | * iio_buffer_wakeup_poll - Wakes up the buffer waitqueue | |
132 | * @indio_dev: The IIO device | |
133 | * | |
134 | * Wakes up the event waitqueue used for poll(). Should usually | |
135 | * be called when the device is unregistered. | |
136 | */ | |
137 | void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) | |
138 | { | |
139 | if (!indio_dev->buffer) | |
140 | return; | |
141 | ||
142 | wake_up(&indio_dev->buffer->pollq); | |
143 | } | |
144 | ||
f79a9098 | 145 | void iio_buffer_init(struct iio_buffer *buffer) |
7026ea4b | 146 | { |
5ada4ea9 | 147 | INIT_LIST_HEAD(&buffer->demux_list); |
705ee2c9 | 148 | INIT_LIST_HEAD(&buffer->buffer_list); |
14555b14 | 149 | init_waitqueue_head(&buffer->pollq); |
9e69c935 | 150 | kref_init(&buffer->ref); |
37d34556 | 151 | buffer->watermark = 1; |
7026ea4b | 152 | } |
14555b14 | 153 | EXPORT_SYMBOL(iio_buffer_init); |
7026ea4b | 154 | |
1d892719 | 155 | static ssize_t iio_show_scan_index(struct device *dev, |
8d213f24 JC |
156 | struct device_attribute *attr, |
157 | char *buf) | |
1d892719 | 158 | { |
8d213f24 | 159 | return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index); |
1d892719 JC |
160 | } |
161 | ||
162 | static ssize_t iio_show_fixed_type(struct device *dev, | |
163 | struct device_attribute *attr, | |
164 | char *buf) | |
165 | { | |
166 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
8310b86c JC |
167 | u8 type = this_attr->c->scan_type.endianness; |
168 | ||
169 | if (type == IIO_CPU) { | |
9d5d1153 JC |
170 | #ifdef __LITTLE_ENDIAN |
171 | type = IIO_LE; | |
172 | #else | |
173 | type = IIO_BE; | |
174 | #endif | |
8310b86c | 175 | } |
0ee8546a SP |
176 | if (this_attr->c->scan_type.repeat > 1) |
177 | return sprintf(buf, "%s:%c%d/%dX%d>>%u\n", | |
178 | iio_endian_prefix[type], | |
179 | this_attr->c->scan_type.sign, | |
180 | this_attr->c->scan_type.realbits, | |
181 | this_attr->c->scan_type.storagebits, | |
182 | this_attr->c->scan_type.repeat, | |
183 | this_attr->c->scan_type.shift); | |
184 | else | |
185 | return sprintf(buf, "%s:%c%d/%d>>%u\n", | |
8310b86c | 186 | iio_endian_prefix[type], |
1d892719 JC |
187 | this_attr->c->scan_type.sign, |
188 | this_attr->c->scan_type.realbits, | |
189 | this_attr->c->scan_type.storagebits, | |
190 | this_attr->c->scan_type.shift); | |
191 | } | |
192 | ||
8d213f24 JC |
193 | static ssize_t iio_scan_el_show(struct device *dev, |
194 | struct device_attribute *attr, | |
195 | char *buf) | |
196 | { | |
197 | int ret; | |
e53f5ac5 | 198 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
8d213f24 | 199 | |
2076a20f AB |
200 | /* Ensure ret is 0 or 1. */ |
201 | ret = !!test_bit(to_iio_dev_attr(attr)->address, | |
5ada4ea9 JC |
202 | indio_dev->buffer->scan_mask); |
203 | ||
8d213f24 JC |
204 | return sprintf(buf, "%d\n", ret); |
205 | } | |
206 | ||
217a5cf0 LPC |
207 | /* Note NULL used as error indicator as it doesn't make sense. */ |
208 | static const unsigned long *iio_scan_mask_match(const unsigned long *av_masks, | |
209 | unsigned int masklength, | |
210 | const unsigned long *mask) | |
211 | { | |
212 | if (bitmap_empty(mask, masklength)) | |
213 | return NULL; | |
214 | while (*av_masks) { | |
215 | if (bitmap_subset(mask, av_masks, masklength)) | |
216 | return av_masks; | |
217 | av_masks += BITS_TO_LONGS(masklength); | |
218 | } | |
219 | return NULL; | |
220 | } | |
221 | ||
222 | static bool iio_validate_scan_mask(struct iio_dev *indio_dev, | |
223 | const unsigned long *mask) | |
224 | { | |
225 | if (!indio_dev->setup_ops->validate_scan_mask) | |
226 | return true; | |
227 | ||
228 | return indio_dev->setup_ops->validate_scan_mask(indio_dev, mask); | |
229 | } | |
230 | ||
231 | /** | |
232 | * iio_scan_mask_set() - set particular bit in the scan mask | |
233 | * @indio_dev: the iio device | |
234 | * @buffer: the buffer whose scan mask we are interested in | |
235 | * @bit: the bit to be set. | |
236 | * | |
237 | * Note that at this point we have no way of knowing what other | |
238 | * buffers might request, hence this code only verifies that the | |
239 | * individual buffers request is plausible. | |
240 | */ | |
241 | static int iio_scan_mask_set(struct iio_dev *indio_dev, | |
242 | struct iio_buffer *buffer, int bit) | |
243 | { | |
244 | const unsigned long *mask; | |
245 | unsigned long *trialmask; | |
246 | ||
247 | trialmask = kmalloc(sizeof(*trialmask)* | |
248 | BITS_TO_LONGS(indio_dev->masklength), | |
249 | GFP_KERNEL); | |
250 | ||
251 | if (trialmask == NULL) | |
252 | return -ENOMEM; | |
253 | if (!indio_dev->masklength) { | |
254 | WARN_ON("Trying to set scanmask prior to registering buffer\n"); | |
255 | goto err_invalid_mask; | |
256 | } | |
257 | bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength); | |
258 | set_bit(bit, trialmask); | |
259 | ||
260 | if (!iio_validate_scan_mask(indio_dev, trialmask)) | |
261 | goto err_invalid_mask; | |
262 | ||
263 | if (indio_dev->available_scan_masks) { | |
264 | mask = iio_scan_mask_match(indio_dev->available_scan_masks, | |
265 | indio_dev->masklength, | |
266 | trialmask); | |
267 | if (!mask) | |
268 | goto err_invalid_mask; | |
269 | } | |
270 | bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength); | |
271 | ||
272 | kfree(trialmask); | |
273 | ||
274 | return 0; | |
275 | ||
276 | err_invalid_mask: | |
277 | kfree(trialmask); | |
278 | return -EINVAL; | |
279 | } | |
280 | ||
14555b14 | 281 | static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit) |
8d213f24 | 282 | { |
14555b14 | 283 | clear_bit(bit, buffer->scan_mask); |
8d213f24 JC |
284 | return 0; |
285 | } | |
286 | ||
287 | static ssize_t iio_scan_el_store(struct device *dev, | |
288 | struct device_attribute *attr, | |
289 | const char *buf, | |
290 | size_t len) | |
291 | { | |
a714af27 | 292 | int ret; |
8d213f24 | 293 | bool state; |
e53f5ac5 | 294 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 295 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 JC |
296 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
297 | ||
a714af27 JC |
298 | ret = strtobool(buf, &state); |
299 | if (ret < 0) | |
300 | return ret; | |
8d213f24 | 301 | mutex_lock(&indio_dev->mlock); |
705ee2c9 | 302 | if (iio_buffer_is_active(indio_dev->buffer)) { |
8d213f24 JC |
303 | ret = -EBUSY; |
304 | goto error_ret; | |
305 | } | |
f79a9098 | 306 | ret = iio_scan_mask_query(indio_dev, buffer, this_attr->address); |
8d213f24 JC |
307 | if (ret < 0) |
308 | goto error_ret; | |
309 | if (!state && ret) { | |
14555b14 | 310 | ret = iio_scan_mask_clear(buffer, this_attr->address); |
8d213f24 JC |
311 | if (ret) |
312 | goto error_ret; | |
313 | } else if (state && !ret) { | |
f79a9098 | 314 | ret = iio_scan_mask_set(indio_dev, buffer, this_attr->address); |
8d213f24 JC |
315 | if (ret) |
316 | goto error_ret; | |
317 | } | |
318 | ||
319 | error_ret: | |
320 | mutex_unlock(&indio_dev->mlock); | |
321 | ||
5a2a6e11 | 322 | return ret < 0 ? ret : len; |
8d213f24 JC |
323 | |
324 | } | |
325 | ||
326 | static ssize_t iio_scan_el_ts_show(struct device *dev, | |
327 | struct device_attribute *attr, | |
328 | char *buf) | |
329 | { | |
e53f5ac5 | 330 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
f8c6f4e9 | 331 | return sprintf(buf, "%d\n", indio_dev->buffer->scan_timestamp); |
8d213f24 JC |
332 | } |
333 | ||
334 | static ssize_t iio_scan_el_ts_store(struct device *dev, | |
335 | struct device_attribute *attr, | |
336 | const char *buf, | |
337 | size_t len) | |
338 | { | |
a714af27 | 339 | int ret; |
e53f5ac5 | 340 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
8d213f24 | 341 | bool state; |
1aa04278 | 342 | |
a714af27 JC |
343 | ret = strtobool(buf, &state); |
344 | if (ret < 0) | |
345 | return ret; | |
346 | ||
8d213f24 | 347 | mutex_lock(&indio_dev->mlock); |
705ee2c9 | 348 | if (iio_buffer_is_active(indio_dev->buffer)) { |
8d213f24 JC |
349 | ret = -EBUSY; |
350 | goto error_ret; | |
351 | } | |
14555b14 | 352 | indio_dev->buffer->scan_timestamp = state; |
8d213f24 JC |
353 | error_ret: |
354 | mutex_unlock(&indio_dev->mlock); | |
355 | ||
356 | return ret ? ret : len; | |
357 | } | |
358 | ||
14555b14 JC |
359 | static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev, |
360 | const struct iio_chan_spec *chan) | |
1d892719 | 361 | { |
26d25ae3 | 362 | int ret, attrcount = 0; |
14555b14 | 363 | struct iio_buffer *buffer = indio_dev->buffer; |
1d892719 | 364 | |
26d25ae3 | 365 | ret = __iio_add_chan_devattr("index", |
1d892719 JC |
366 | chan, |
367 | &iio_show_scan_index, | |
368 | NULL, | |
369 | 0, | |
3704432f | 370 | IIO_SEPARATE, |
1aa04278 | 371 | &indio_dev->dev, |
14555b14 | 372 | &buffer->scan_el_dev_attr_list); |
1d892719 | 373 | if (ret) |
92825ff9 | 374 | return ret; |
26d25ae3 JC |
375 | attrcount++; |
376 | ret = __iio_add_chan_devattr("type", | |
1d892719 JC |
377 | chan, |
378 | &iio_show_fixed_type, | |
379 | NULL, | |
380 | 0, | |
381 | 0, | |
1aa04278 | 382 | &indio_dev->dev, |
14555b14 | 383 | &buffer->scan_el_dev_attr_list); |
1d892719 | 384 | if (ret) |
92825ff9 | 385 | return ret; |
26d25ae3 | 386 | attrcount++; |
a88b3ebc | 387 | if (chan->type != IIO_TIMESTAMP) |
26d25ae3 | 388 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
389 | chan, |
390 | &iio_scan_el_show, | |
391 | &iio_scan_el_store, | |
392 | chan->scan_index, | |
393 | 0, | |
1aa04278 | 394 | &indio_dev->dev, |
14555b14 | 395 | &buffer->scan_el_dev_attr_list); |
a88b3ebc | 396 | else |
26d25ae3 | 397 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
398 | chan, |
399 | &iio_scan_el_ts_show, | |
400 | &iio_scan_el_ts_store, | |
401 | chan->scan_index, | |
402 | 0, | |
1aa04278 | 403 | &indio_dev->dev, |
14555b14 | 404 | &buffer->scan_el_dev_attr_list); |
9572588c | 405 | if (ret) |
92825ff9 | 406 | return ret; |
26d25ae3 JC |
407 | attrcount++; |
408 | ret = attrcount; | |
1d892719 JC |
409 | return ret; |
410 | } | |
411 | ||
08e7e0ad LPC |
412 | static ssize_t iio_buffer_read_length(struct device *dev, |
413 | struct device_attribute *attr, | |
414 | char *buf) | |
7026ea4b | 415 | { |
e53f5ac5 | 416 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 417 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 418 | |
37495660 | 419 | return sprintf(buf, "%d\n", buffer->length); |
7026ea4b | 420 | } |
7026ea4b | 421 | |
08e7e0ad LPC |
422 | static ssize_t iio_buffer_write_length(struct device *dev, |
423 | struct device_attribute *attr, | |
424 | const char *buf, size_t len) | |
7026ea4b | 425 | { |
e53f5ac5 | 426 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 427 | struct iio_buffer *buffer = indio_dev->buffer; |
948ad205 LPC |
428 | unsigned int val; |
429 | int ret; | |
8d213f24 | 430 | |
948ad205 | 431 | ret = kstrtouint(buf, 10, &val); |
7026ea4b JC |
432 | if (ret) |
433 | return ret; | |
434 | ||
37495660 LPC |
435 | if (val == buffer->length) |
436 | return len; | |
7026ea4b | 437 | |
e38c79e0 | 438 | mutex_lock(&indio_dev->mlock); |
705ee2c9 | 439 | if (iio_buffer_is_active(indio_dev->buffer)) { |
e38c79e0 LPC |
440 | ret = -EBUSY; |
441 | } else { | |
8d92db28 | 442 | buffer->access->set_length(buffer, val); |
e38c79e0 | 443 | ret = 0; |
7026ea4b | 444 | } |
37d34556 JC |
445 | if (ret) |
446 | goto out; | |
447 | if (buffer->length && buffer->length < buffer->watermark) | |
448 | buffer->watermark = buffer->length; | |
449 | out: | |
e38c79e0 | 450 | mutex_unlock(&indio_dev->mlock); |
7026ea4b | 451 | |
e38c79e0 | 452 | return ret ? ret : len; |
7026ea4b | 453 | } |
7026ea4b | 454 | |
08e7e0ad LPC |
455 | static ssize_t iio_buffer_show_enable(struct device *dev, |
456 | struct device_attribute *attr, | |
457 | char *buf) | |
7026ea4b | 458 | { |
e53f5ac5 | 459 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
705ee2c9 | 460 | return sprintf(buf, "%d\n", iio_buffer_is_active(indio_dev->buffer)); |
7026ea4b | 461 | } |
7026ea4b | 462 | |
183f4173 PM |
463 | static int iio_compute_scan_bytes(struct iio_dev *indio_dev, |
464 | const unsigned long *mask, bool timestamp) | |
959d2952 | 465 | { |
959d2952 JC |
466 | const struct iio_chan_spec *ch; |
467 | unsigned bytes = 0; | |
468 | int length, i; | |
959d2952 JC |
469 | |
470 | /* How much space will the demuxed element take? */ | |
6b3b58ed | 471 | for_each_set_bit(i, mask, |
959d2952 JC |
472 | indio_dev->masklength) { |
473 | ch = iio_find_channel_from_si(indio_dev, i); | |
0ee8546a SP |
474 | if (ch->scan_type.repeat > 1) |
475 | length = ch->scan_type.storagebits / 8 * | |
476 | ch->scan_type.repeat; | |
477 | else | |
478 | length = ch->scan_type.storagebits / 8; | |
959d2952 JC |
479 | bytes = ALIGN(bytes, length); |
480 | bytes += length; | |
481 | } | |
6b3b58ed | 482 | if (timestamp) { |
959d2952 | 483 | ch = iio_find_channel_from_si(indio_dev, |
f1264809 | 484 | indio_dev->scan_index_timestamp); |
0ee8546a SP |
485 | if (ch->scan_type.repeat > 1) |
486 | length = ch->scan_type.storagebits / 8 * | |
487 | ch->scan_type.repeat; | |
488 | else | |
489 | length = ch->scan_type.storagebits / 8; | |
959d2952 JC |
490 | bytes = ALIGN(bytes, length); |
491 | bytes += length; | |
492 | } | |
6b3b58ed JC |
493 | return bytes; |
494 | } | |
495 | ||
9e69c935 LPC |
496 | static void iio_buffer_activate(struct iio_dev *indio_dev, |
497 | struct iio_buffer *buffer) | |
498 | { | |
499 | iio_buffer_get(buffer); | |
500 | list_add(&buffer->buffer_list, &indio_dev->buffer_list); | |
501 | } | |
502 | ||
503 | static void iio_buffer_deactivate(struct iio_buffer *buffer) | |
504 | { | |
505 | list_del_init(&buffer->buffer_list); | |
37d34556 | 506 | wake_up_interruptible(&buffer->pollq); |
9e69c935 LPC |
507 | iio_buffer_put(buffer); |
508 | } | |
509 | ||
a87c82e4 LPC |
510 | void iio_disable_all_buffers(struct iio_dev *indio_dev) |
511 | { | |
512 | struct iio_buffer *buffer, *_buffer; | |
513 | ||
514 | if (list_empty(&indio_dev->buffer_list)) | |
515 | return; | |
516 | ||
517 | if (indio_dev->setup_ops->predisable) | |
518 | indio_dev->setup_ops->predisable(indio_dev); | |
519 | ||
520 | list_for_each_entry_safe(buffer, _buffer, | |
521 | &indio_dev->buffer_list, buffer_list) | |
9e69c935 | 522 | iio_buffer_deactivate(buffer); |
a87c82e4 LPC |
523 | |
524 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
525 | if (indio_dev->setup_ops->postdisable) | |
526 | indio_dev->setup_ops->postdisable(indio_dev); | |
e086ed76 LPC |
527 | |
528 | if (indio_dev->available_scan_masks == NULL) | |
529 | kfree(indio_dev->active_scan_mask); | |
a87c82e4 LPC |
530 | } |
531 | ||
8e050996 LPC |
532 | static void iio_buffer_update_bytes_per_datum(struct iio_dev *indio_dev, |
533 | struct iio_buffer *buffer) | |
534 | { | |
535 | unsigned int bytes; | |
536 | ||
537 | if (!buffer->access->set_bytes_per_datum) | |
538 | return; | |
539 | ||
540 | bytes = iio_compute_scan_bytes(indio_dev, buffer->scan_mask, | |
541 | buffer->scan_timestamp); | |
542 | ||
543 | buffer->access->set_bytes_per_datum(buffer, bytes); | |
544 | } | |
545 | ||
a9519456 | 546 | static int __iio_update_buffers(struct iio_dev *indio_dev, |
84b36ce5 JC |
547 | struct iio_buffer *insert_buffer, |
548 | struct iio_buffer *remove_buffer) | |
6b3b58ed | 549 | { |
84b36ce5 JC |
550 | int ret; |
551 | int success = 0; | |
552 | struct iio_buffer *buffer; | |
553 | unsigned long *compound_mask; | |
554 | const unsigned long *old_mask; | |
6b3b58ed | 555 | |
84b36ce5 JC |
556 | /* Wind down existing buffers - iff there are any */ |
557 | if (!list_empty(&indio_dev->buffer_list)) { | |
558 | if (indio_dev->setup_ops->predisable) { | |
559 | ret = indio_dev->setup_ops->predisable(indio_dev); | |
560 | if (ret) | |
92825ff9 | 561 | return ret; |
84b36ce5 JC |
562 | } |
563 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
564 | if (indio_dev->setup_ops->postdisable) { | |
565 | ret = indio_dev->setup_ops->postdisable(indio_dev); | |
566 | if (ret) | |
92825ff9 | 567 | return ret; |
84b36ce5 JC |
568 | } |
569 | } | |
570 | /* Keep a copy of current setup to allow roll back */ | |
571 | old_mask = indio_dev->active_scan_mask; | |
572 | if (!indio_dev->available_scan_masks) | |
573 | indio_dev->active_scan_mask = NULL; | |
574 | ||
575 | if (remove_buffer) | |
9e69c935 | 576 | iio_buffer_deactivate(remove_buffer); |
84b36ce5 | 577 | if (insert_buffer) |
9e69c935 | 578 | iio_buffer_activate(indio_dev, insert_buffer); |
84b36ce5 JC |
579 | |
580 | /* If no buffers in list, we are done */ | |
581 | if (list_empty(&indio_dev->buffer_list)) { | |
582 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
583 | if (indio_dev->available_scan_masks == NULL) | |
584 | kfree(old_mask); | |
585 | return 0; | |
586 | } | |
959d2952 | 587 | |
9572588c | 588 | /* What scan mask do we actually have? */ |
84b36ce5 JC |
589 | compound_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), |
590 | sizeof(long), GFP_KERNEL); | |
591 | if (compound_mask == NULL) { | |
592 | if (indio_dev->available_scan_masks == NULL) | |
593 | kfree(old_mask); | |
594 | return -ENOMEM; | |
595 | } | |
596 | indio_dev->scan_timestamp = 0; | |
597 | ||
598 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { | |
599 | bitmap_or(compound_mask, compound_mask, buffer->scan_mask, | |
600 | indio_dev->masklength); | |
601 | indio_dev->scan_timestamp |= buffer->scan_timestamp; | |
602 | } | |
603 | if (indio_dev->available_scan_masks) { | |
959d2952 JC |
604 | indio_dev->active_scan_mask = |
605 | iio_scan_mask_match(indio_dev->available_scan_masks, | |
606 | indio_dev->masklength, | |
84b36ce5 JC |
607 | compound_mask); |
608 | if (indio_dev->active_scan_mask == NULL) { | |
609 | /* | |
610 | * Roll back. | |
611 | * Note can only occur when adding a buffer. | |
612 | */ | |
9e69c935 | 613 | iio_buffer_deactivate(insert_buffer); |
d66e0452 PM |
614 | if (old_mask) { |
615 | indio_dev->active_scan_mask = old_mask; | |
616 | success = -EINVAL; | |
617 | } | |
618 | else { | |
619 | kfree(compound_mask); | |
620 | ret = -EINVAL; | |
92825ff9 | 621 | return ret; |
d66e0452 | 622 | } |
84b36ce5 JC |
623 | } |
624 | } else { | |
625 | indio_dev->active_scan_mask = compound_mask; | |
626 | } | |
aff1eb4e | 627 | |
5ada4ea9 JC |
628 | iio_update_demux(indio_dev); |
629 | ||
84b36ce5 JC |
630 | /* Wind up again */ |
631 | if (indio_dev->setup_ops->preenable) { | |
632 | ret = indio_dev->setup_ops->preenable(indio_dev); | |
633 | if (ret) { | |
634 | printk(KERN_ERR | |
bec1889d | 635 | "Buffer not started: buffer preenable failed (%d)\n", ret); |
84b36ce5 JC |
636 | goto error_remove_inserted; |
637 | } | |
638 | } | |
639 | indio_dev->scan_bytes = | |
640 | iio_compute_scan_bytes(indio_dev, | |
641 | indio_dev->active_scan_mask, | |
642 | indio_dev->scan_timestamp); | |
8e050996 LPC |
643 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { |
644 | iio_buffer_update_bytes_per_datum(indio_dev, buffer); | |
84b36ce5 JC |
645 | if (buffer->access->request_update) { |
646 | ret = buffer->access->request_update(buffer); | |
647 | if (ret) { | |
648 | printk(KERN_INFO | |
bec1889d | 649 | "Buffer not started: buffer parameter update failed (%d)\n", ret); |
84b36ce5 JC |
650 | goto error_run_postdisable; |
651 | } | |
652 | } | |
8e050996 | 653 | } |
84b36ce5 JC |
654 | if (indio_dev->info->update_scan_mode) { |
655 | ret = indio_dev->info | |
5ada4ea9 JC |
656 | ->update_scan_mode(indio_dev, |
657 | indio_dev->active_scan_mask); | |
84b36ce5 | 658 | if (ret < 0) { |
bec1889d | 659 | printk(KERN_INFO "Buffer not started: update scan mode failed (%d)\n", ret); |
84b36ce5 JC |
660 | goto error_run_postdisable; |
661 | } | |
662 | } | |
9572588c | 663 | /* Definitely possible for devices to support both of these. */ |
84b36ce5 JC |
664 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) { |
665 | if (!indio_dev->trig) { | |
666 | printk(KERN_INFO "Buffer not started: no trigger\n"); | |
667 | ret = -EINVAL; | |
668 | /* Can only occur on first buffer */ | |
669 | goto error_run_postdisable; | |
670 | } | |
671 | indio_dev->currentmode = INDIO_BUFFER_TRIGGERED; | |
672 | } else if (indio_dev->modes & INDIO_BUFFER_HARDWARE) { | |
673 | indio_dev->currentmode = INDIO_BUFFER_HARDWARE; | |
03af03ad KW |
674 | } else if (indio_dev->modes & INDIO_BUFFER_SOFTWARE) { |
675 | indio_dev->currentmode = INDIO_BUFFER_SOFTWARE; | |
9572588c | 676 | } else { /* Should never be reached */ |
84b36ce5 JC |
677 | ret = -EINVAL; |
678 | goto error_run_postdisable; | |
679 | } | |
680 | ||
681 | if (indio_dev->setup_ops->postenable) { | |
682 | ret = indio_dev->setup_ops->postenable(indio_dev); | |
683 | if (ret) { | |
684 | printk(KERN_INFO | |
bec1889d | 685 | "Buffer not started: postenable failed (%d)\n", ret); |
84b36ce5 JC |
686 | indio_dev->currentmode = INDIO_DIRECT_MODE; |
687 | if (indio_dev->setup_ops->postdisable) | |
688 | indio_dev->setup_ops->postdisable(indio_dev); | |
689 | goto error_disable_all_buffers; | |
690 | } | |
691 | } | |
692 | ||
693 | if (indio_dev->available_scan_masks) | |
694 | kfree(compound_mask); | |
695 | else | |
696 | kfree(old_mask); | |
697 | ||
698 | return success; | |
699 | ||
700 | error_disable_all_buffers: | |
701 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
702 | error_run_postdisable: | |
703 | if (indio_dev->setup_ops->postdisable) | |
704 | indio_dev->setup_ops->postdisable(indio_dev); | |
705 | error_remove_inserted: | |
84b36ce5 | 706 | if (insert_buffer) |
9e69c935 | 707 | iio_buffer_deactivate(insert_buffer); |
84b36ce5 JC |
708 | indio_dev->active_scan_mask = old_mask; |
709 | kfree(compound_mask); | |
84b36ce5 JC |
710 | return ret; |
711 | } | |
a9519456 LPC |
712 | |
713 | int iio_update_buffers(struct iio_dev *indio_dev, | |
714 | struct iio_buffer *insert_buffer, | |
715 | struct iio_buffer *remove_buffer) | |
716 | { | |
717 | int ret; | |
718 | ||
3909fab5 LPC |
719 | if (insert_buffer == remove_buffer) |
720 | return 0; | |
721 | ||
a9519456 LPC |
722 | mutex_lock(&indio_dev->info_exist_lock); |
723 | mutex_lock(&indio_dev->mlock); | |
724 | ||
3909fab5 LPC |
725 | if (insert_buffer && iio_buffer_is_active(insert_buffer)) |
726 | insert_buffer = NULL; | |
727 | ||
728 | if (remove_buffer && !iio_buffer_is_active(remove_buffer)) | |
729 | remove_buffer = NULL; | |
730 | ||
731 | if (!insert_buffer && !remove_buffer) { | |
732 | ret = 0; | |
733 | goto out_unlock; | |
734 | } | |
735 | ||
a9519456 LPC |
736 | if (indio_dev->info == NULL) { |
737 | ret = -ENODEV; | |
738 | goto out_unlock; | |
739 | } | |
740 | ||
741 | ret = __iio_update_buffers(indio_dev, insert_buffer, remove_buffer); | |
742 | ||
743 | out_unlock: | |
744 | mutex_unlock(&indio_dev->mlock); | |
745 | mutex_unlock(&indio_dev->info_exist_lock); | |
746 | ||
747 | return ret; | |
748 | } | |
84b36ce5 JC |
749 | EXPORT_SYMBOL_GPL(iio_update_buffers); |
750 | ||
08e7e0ad LPC |
751 | static ssize_t iio_buffer_store_enable(struct device *dev, |
752 | struct device_attribute *attr, | |
753 | const char *buf, | |
754 | size_t len) | |
84b36ce5 JC |
755 | { |
756 | int ret; | |
757 | bool requested_state; | |
758 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
84b36ce5 JC |
759 | bool inlist; |
760 | ||
761 | ret = strtobool(buf, &requested_state); | |
762 | if (ret < 0) | |
763 | return ret; | |
764 | ||
765 | mutex_lock(&indio_dev->mlock); | |
766 | ||
767 | /* Find out if it is in the list */ | |
705ee2c9 | 768 | inlist = iio_buffer_is_active(indio_dev->buffer); |
84b36ce5 JC |
769 | /* Already in desired state */ |
770 | if (inlist == requested_state) | |
771 | goto done; | |
772 | ||
773 | if (requested_state) | |
a9519456 | 774 | ret = __iio_update_buffers(indio_dev, |
84b36ce5 JC |
775 | indio_dev->buffer, NULL); |
776 | else | |
a9519456 | 777 | ret = __iio_update_buffers(indio_dev, |
84b36ce5 JC |
778 | NULL, indio_dev->buffer); |
779 | ||
780 | if (ret < 0) | |
781 | goto done; | |
782 | done: | |
783 | mutex_unlock(&indio_dev->mlock); | |
784 | return (ret < 0) ? ret : len; | |
785 | } | |
84b36ce5 | 786 | |
d967cb6b LPC |
787 | static const char * const iio_scan_elements_group_name = "scan_elements"; |
788 | ||
37d34556 JC |
789 | static ssize_t iio_buffer_show_watermark(struct device *dev, |
790 | struct device_attribute *attr, | |
791 | char *buf) | |
792 | { | |
793 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
794 | struct iio_buffer *buffer = indio_dev->buffer; | |
795 | ||
796 | return sprintf(buf, "%u\n", buffer->watermark); | |
797 | } | |
798 | ||
799 | static ssize_t iio_buffer_store_watermark(struct device *dev, | |
800 | struct device_attribute *attr, | |
801 | const char *buf, | |
802 | size_t len) | |
803 | { | |
804 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
805 | struct iio_buffer *buffer = indio_dev->buffer; | |
806 | unsigned int val; | |
807 | int ret; | |
808 | ||
809 | ret = kstrtouint(buf, 10, &val); | |
810 | if (ret) | |
811 | return ret; | |
812 | if (!val) | |
813 | return -EINVAL; | |
814 | ||
815 | mutex_lock(&indio_dev->mlock); | |
816 | ||
817 | if (val > buffer->length) { | |
818 | ret = -EINVAL; | |
819 | goto out; | |
820 | } | |
821 | ||
822 | if (iio_buffer_is_active(indio_dev->buffer)) { | |
823 | ret = -EBUSY; | |
824 | goto out; | |
825 | } | |
826 | ||
827 | buffer->watermark = val; | |
828 | out: | |
829 | mutex_unlock(&indio_dev->mlock); | |
830 | ||
831 | return ret ? ret : len; | |
832 | } | |
833 | ||
08e7e0ad LPC |
834 | static DEVICE_ATTR(length, S_IRUGO | S_IWUSR, iio_buffer_read_length, |
835 | iio_buffer_write_length); | |
8d92db28 LPC |
836 | static struct device_attribute dev_attr_length_ro = __ATTR(length, |
837 | S_IRUGO, iio_buffer_read_length, NULL); | |
08e7e0ad LPC |
838 | static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, |
839 | iio_buffer_show_enable, iio_buffer_store_enable); | |
37d34556 JC |
840 | static DEVICE_ATTR(watermark, S_IRUGO | S_IWUSR, |
841 | iio_buffer_show_watermark, iio_buffer_store_watermark); | |
08e7e0ad | 842 | |
6da9b382 OP |
843 | static struct attribute *iio_buffer_attrs[] = { |
844 | &dev_attr_length.attr, | |
845 | &dev_attr_enable.attr, | |
37d34556 | 846 | &dev_attr_watermark.attr, |
6da9b382 OP |
847 | }; |
848 | ||
d967cb6b LPC |
849 | int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev) |
850 | { | |
851 | struct iio_dev_attr *p; | |
852 | struct attribute **attr; | |
853 | struct iio_buffer *buffer = indio_dev->buffer; | |
854 | int ret, i, attrn, attrcount, attrcount_orig = 0; | |
855 | const struct iio_chan_spec *channels; | |
856 | ||
857 | if (!buffer) | |
858 | return 0; | |
859 | ||
08e7e0ad LPC |
860 | attrcount = 0; |
861 | if (buffer->attrs) { | |
862 | while (buffer->attrs[attrcount] != NULL) | |
863 | attrcount++; | |
864 | } | |
865 | ||
6da9b382 OP |
866 | attr = kcalloc(attrcount + ARRAY_SIZE(iio_buffer_attrs) + 1, |
867 | sizeof(struct attribute *), GFP_KERNEL); | |
868 | if (!attr) | |
08e7e0ad LPC |
869 | return -ENOMEM; |
870 | ||
6da9b382 OP |
871 | memcpy(attr, iio_buffer_attrs, sizeof(iio_buffer_attrs)); |
872 | if (!buffer->access->set_length) | |
873 | attr[0] = &dev_attr_length_ro.attr; | |
874 | ||
08e7e0ad | 875 | if (buffer->attrs) |
6da9b382 OP |
876 | memcpy(&attr[ARRAY_SIZE(iio_buffer_attrs)], buffer->attrs, |
877 | sizeof(struct attribute *) * attrcount); | |
878 | ||
879 | attr[attrcount + ARRAY_SIZE(iio_buffer_attrs)] = NULL; | |
880 | ||
881 | buffer->buffer_group.name = "buffer"; | |
882 | buffer->buffer_group.attrs = attr; | |
08e7e0ad LPC |
883 | |
884 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->buffer_group; | |
885 | ||
d967cb6b LPC |
886 | if (buffer->scan_el_attrs != NULL) { |
887 | attr = buffer->scan_el_attrs->attrs; | |
888 | while (*attr++ != NULL) | |
889 | attrcount_orig++; | |
890 | } | |
891 | attrcount = attrcount_orig; | |
892 | INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list); | |
893 | channels = indio_dev->channels; | |
894 | if (channels) { | |
895 | /* new magic */ | |
896 | for (i = 0; i < indio_dev->num_channels; i++) { | |
897 | if (channels[i].scan_index < 0) | |
898 | continue; | |
899 | ||
900 | /* Establish necessary mask length */ | |
901 | if (channels[i].scan_index > | |
902 | (int)indio_dev->masklength - 1) | |
903 | indio_dev->masklength | |
904 | = channels[i].scan_index + 1; | |
905 | ||
906 | ret = iio_buffer_add_channel_sysfs(indio_dev, | |
907 | &channels[i]); | |
908 | if (ret < 0) | |
909 | goto error_cleanup_dynamic; | |
910 | attrcount += ret; | |
911 | if (channels[i].type == IIO_TIMESTAMP) | |
912 | indio_dev->scan_index_timestamp = | |
913 | channels[i].scan_index; | |
914 | } | |
915 | if (indio_dev->masklength && buffer->scan_mask == NULL) { | |
916 | buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), | |
917 | sizeof(*buffer->scan_mask), | |
918 | GFP_KERNEL); | |
919 | if (buffer->scan_mask == NULL) { | |
920 | ret = -ENOMEM; | |
921 | goto error_cleanup_dynamic; | |
922 | } | |
923 | } | |
924 | } | |
925 | ||
926 | buffer->scan_el_group.name = iio_scan_elements_group_name; | |
927 | ||
928 | buffer->scan_el_group.attrs = kcalloc(attrcount + 1, | |
929 | sizeof(buffer->scan_el_group.attrs[0]), | |
930 | GFP_KERNEL); | |
931 | if (buffer->scan_el_group.attrs == NULL) { | |
932 | ret = -ENOMEM; | |
933 | goto error_free_scan_mask; | |
934 | } | |
935 | if (buffer->scan_el_attrs) | |
936 | memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs, | |
937 | sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig); | |
938 | attrn = attrcount_orig; | |
939 | ||
940 | list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l) | |
941 | buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr; | |
942 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group; | |
943 | ||
944 | return 0; | |
945 | ||
946 | error_free_scan_mask: | |
947 | kfree(buffer->scan_mask); | |
948 | error_cleanup_dynamic: | |
949 | iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list); | |
08e7e0ad | 950 | kfree(indio_dev->buffer->buffer_group.attrs); |
d967cb6b LPC |
951 | |
952 | return ret; | |
953 | } | |
954 | ||
955 | void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev) | |
956 | { | |
957 | if (!indio_dev->buffer) | |
958 | return; | |
959 | ||
960 | kfree(indio_dev->buffer->scan_mask); | |
08e7e0ad | 961 | kfree(indio_dev->buffer->buffer_group.attrs); |
d967cb6b LPC |
962 | kfree(indio_dev->buffer->scan_el_group.attrs); |
963 | iio_free_chan_devattr_list(&indio_dev->buffer->scan_el_dev_attr_list); | |
964 | } | |
965 | ||
81636632 LPC |
966 | /** |
967 | * iio_validate_scan_mask_onehot() - Validates that exactly one channel is selected | |
968 | * @indio_dev: the iio device | |
969 | * @mask: scan mask to be checked | |
970 | * | |
971 | * Return true if exactly one bit is set in the scan mask, false otherwise. It | |
972 | * can be used for devices where only one channel can be active for sampling at | |
973 | * a time. | |
974 | */ | |
975 | bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev, | |
976 | const unsigned long *mask) | |
977 | { | |
978 | return bitmap_weight(mask, indio_dev->masklength) == 1; | |
979 | } | |
980 | EXPORT_SYMBOL_GPL(iio_validate_scan_mask_onehot); | |
981 | ||
f79a9098 JC |
982 | int iio_scan_mask_query(struct iio_dev *indio_dev, |
983 | struct iio_buffer *buffer, int bit) | |
32b5eeca | 984 | { |
f8c6f4e9 | 985 | if (bit > indio_dev->masklength) |
32b5eeca JC |
986 | return -EINVAL; |
987 | ||
14555b14 | 988 | if (!buffer->scan_mask) |
32b5eeca | 989 | return 0; |
32b5eeca | 990 | |
2076a20f AB |
991 | /* Ensure return value is 0 or 1. */ |
992 | return !!test_bit(bit, buffer->scan_mask); | |
32b5eeca JC |
993 | }; |
994 | EXPORT_SYMBOL_GPL(iio_scan_mask_query); | |
5ada4ea9 JC |
995 | |
996 | /** | |
997 | * struct iio_demux_table() - table describing demux memcpy ops | |
998 | * @from: index to copy from | |
99698b45 | 999 | * @to: index to copy to |
5ada4ea9 JC |
1000 | * @length: how many bytes to copy |
1001 | * @l: list head used for management | |
1002 | */ | |
1003 | struct iio_demux_table { | |
1004 | unsigned from; | |
1005 | unsigned to; | |
1006 | unsigned length; | |
1007 | struct list_head l; | |
1008 | }; | |
1009 | ||
5d65d920 LPC |
1010 | static const void *iio_demux(struct iio_buffer *buffer, |
1011 | const void *datain) | |
5ada4ea9 JC |
1012 | { |
1013 | struct iio_demux_table *t; | |
1014 | ||
1015 | if (list_empty(&buffer->demux_list)) | |
1016 | return datain; | |
1017 | list_for_each_entry(t, &buffer->demux_list, l) | |
1018 | memcpy(buffer->demux_bounce + t->to, | |
1019 | datain + t->from, t->length); | |
1020 | ||
1021 | return buffer->demux_bounce; | |
1022 | } | |
1023 | ||
5d65d920 | 1024 | static int iio_push_to_buffer(struct iio_buffer *buffer, const void *data) |
5ada4ea9 | 1025 | { |
5d65d920 | 1026 | const void *dataout = iio_demux(buffer, data); |
37d34556 JC |
1027 | int ret; |
1028 | ||
1029 | ret = buffer->access->store_to(buffer, dataout); | |
1030 | if (ret) | |
1031 | return ret; | |
5ada4ea9 | 1032 | |
37d34556 JC |
1033 | /* |
1034 | * We can't just test for watermark to decide if we wake the poll queue | |
1035 | * because read may request less samples than the watermark. | |
1036 | */ | |
1037 | wake_up_interruptible_poll(&buffer->pollq, POLLIN | POLLRDNORM); | |
1038 | return 0; | |
5ada4ea9 | 1039 | } |
5ada4ea9 | 1040 | |
842cd100 JC |
1041 | static void iio_buffer_demux_free(struct iio_buffer *buffer) |
1042 | { | |
1043 | struct iio_demux_table *p, *q; | |
1044 | list_for_each_entry_safe(p, q, &buffer->demux_list, l) { | |
1045 | list_del(&p->l); | |
1046 | kfree(p); | |
1047 | } | |
1048 | } | |
1049 | ||
84b36ce5 | 1050 | |
5d65d920 | 1051 | int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data) |
84b36ce5 JC |
1052 | { |
1053 | int ret; | |
1054 | struct iio_buffer *buf; | |
1055 | ||
1056 | list_for_each_entry(buf, &indio_dev->buffer_list, buffer_list) { | |
1057 | ret = iio_push_to_buffer(buf, data); | |
1058 | if (ret < 0) | |
1059 | return ret; | |
1060 | } | |
1061 | ||
1062 | return 0; | |
1063 | } | |
1064 | EXPORT_SYMBOL_GPL(iio_push_to_buffers); | |
1065 | ||
cbe88bcc LPC |
1066 | static int iio_buffer_add_demux(struct iio_buffer *buffer, |
1067 | struct iio_demux_table **p, unsigned int in_loc, unsigned int out_loc, | |
1068 | unsigned int length) | |
1069 | { | |
1070 | ||
1071 | if (*p && (*p)->from + (*p)->length == in_loc && | |
1072 | (*p)->to + (*p)->length == out_loc) { | |
1073 | (*p)->length += length; | |
1074 | } else { | |
7cdca178 | 1075 | *p = kmalloc(sizeof(**p), GFP_KERNEL); |
cbe88bcc LPC |
1076 | if (*p == NULL) |
1077 | return -ENOMEM; | |
1078 | (*p)->from = in_loc; | |
1079 | (*p)->to = out_loc; | |
1080 | (*p)->length = length; | |
1081 | list_add_tail(&(*p)->l, &buffer->demux_list); | |
1082 | } | |
1083 | ||
1084 | return 0; | |
1085 | } | |
1086 | ||
84b36ce5 JC |
1087 | static int iio_buffer_update_demux(struct iio_dev *indio_dev, |
1088 | struct iio_buffer *buffer) | |
5ada4ea9 JC |
1089 | { |
1090 | const struct iio_chan_spec *ch; | |
5ada4ea9 JC |
1091 | int ret, in_ind = -1, out_ind, length; |
1092 | unsigned in_loc = 0, out_loc = 0; | |
cbe88bcc | 1093 | struct iio_demux_table *p = NULL; |
5ada4ea9 JC |
1094 | |
1095 | /* Clear out any old demux */ | |
842cd100 | 1096 | iio_buffer_demux_free(buffer); |
5ada4ea9 JC |
1097 | kfree(buffer->demux_bounce); |
1098 | buffer->demux_bounce = NULL; | |
1099 | ||
1100 | /* First work out which scan mode we will actually have */ | |
1101 | if (bitmap_equal(indio_dev->active_scan_mask, | |
1102 | buffer->scan_mask, | |
1103 | indio_dev->masklength)) | |
1104 | return 0; | |
1105 | ||
1106 | /* Now we have the two masks, work from least sig and build up sizes */ | |
1107 | for_each_set_bit(out_ind, | |
61bd55ce | 1108 | buffer->scan_mask, |
5ada4ea9 JC |
1109 | indio_dev->masklength) { |
1110 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
1111 | indio_dev->masklength, | |
1112 | in_ind + 1); | |
1113 | while (in_ind != out_ind) { | |
1114 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
1115 | indio_dev->masklength, | |
1116 | in_ind + 1); | |
1117 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
0ee8546a SP |
1118 | if (ch->scan_type.repeat > 1) |
1119 | length = ch->scan_type.storagebits / 8 * | |
1120 | ch->scan_type.repeat; | |
1121 | else | |
1122 | length = ch->scan_type.storagebits / 8; | |
5ada4ea9 | 1123 | /* Make sure we are aligned */ |
61072dbc | 1124 | in_loc = roundup(in_loc, length) + length; |
5ada4ea9 JC |
1125 | } |
1126 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
0ee8546a SP |
1127 | if (ch->scan_type.repeat > 1) |
1128 | length = ch->scan_type.storagebits / 8 * | |
1129 | ch->scan_type.repeat; | |
1130 | else | |
1131 | length = ch->scan_type.storagebits / 8; | |
61072dbc LPC |
1132 | out_loc = roundup(out_loc, length); |
1133 | in_loc = roundup(in_loc, length); | |
cbe88bcc LPC |
1134 | ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length); |
1135 | if (ret) | |
1136 | goto error_clear_mux_table; | |
5ada4ea9 JC |
1137 | out_loc += length; |
1138 | in_loc += length; | |
1139 | } | |
1140 | /* Relies on scan_timestamp being last */ | |
1141 | if (buffer->scan_timestamp) { | |
5ada4ea9 | 1142 | ch = iio_find_channel_from_si(indio_dev, |
f1264809 | 1143 | indio_dev->scan_index_timestamp); |
0ee8546a SP |
1144 | if (ch->scan_type.repeat > 1) |
1145 | length = ch->scan_type.storagebits / 8 * | |
1146 | ch->scan_type.repeat; | |
1147 | else | |
1148 | length = ch->scan_type.storagebits / 8; | |
61072dbc LPC |
1149 | out_loc = roundup(out_loc, length); |
1150 | in_loc = roundup(in_loc, length); | |
cbe88bcc LPC |
1151 | ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length); |
1152 | if (ret) | |
1153 | goto error_clear_mux_table; | |
5ada4ea9 JC |
1154 | out_loc += length; |
1155 | in_loc += length; | |
1156 | } | |
1157 | buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL); | |
1158 | if (buffer->demux_bounce == NULL) { | |
1159 | ret = -ENOMEM; | |
1160 | goto error_clear_mux_table; | |
1161 | } | |
1162 | return 0; | |
1163 | ||
1164 | error_clear_mux_table: | |
842cd100 JC |
1165 | iio_buffer_demux_free(buffer); |
1166 | ||
5ada4ea9 JC |
1167 | return ret; |
1168 | } | |
84b36ce5 JC |
1169 | |
1170 | int iio_update_demux(struct iio_dev *indio_dev) | |
1171 | { | |
1172 | struct iio_buffer *buffer; | |
1173 | int ret; | |
1174 | ||
1175 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { | |
1176 | ret = iio_buffer_update_demux(indio_dev, buffer); | |
1177 | if (ret < 0) | |
1178 | goto error_clear_mux_table; | |
1179 | } | |
1180 | return 0; | |
1181 | ||
1182 | error_clear_mux_table: | |
1183 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) | |
1184 | iio_buffer_demux_free(buffer); | |
1185 | ||
1186 | return ret; | |
1187 | } | |
5ada4ea9 | 1188 | EXPORT_SYMBOL_GPL(iio_update_demux); |
9e69c935 LPC |
1189 | |
1190 | /** | |
1191 | * iio_buffer_release() - Free a buffer's resources | |
1192 | * @ref: Pointer to the kref embedded in the iio_buffer struct | |
1193 | * | |
1194 | * This function is called when the last reference to the buffer has been | |
1195 | * dropped. It will typically free all resources allocated by the buffer. Do not | |
1196 | * call this function manually, always use iio_buffer_put() when done using a | |
1197 | * buffer. | |
1198 | */ | |
1199 | static void iio_buffer_release(struct kref *ref) | |
1200 | { | |
1201 | struct iio_buffer *buffer = container_of(ref, struct iio_buffer, ref); | |
1202 | ||
1203 | buffer->access->release(buffer); | |
1204 | } | |
1205 | ||
1206 | /** | |
1207 | * iio_buffer_get() - Grab a reference to the buffer | |
1208 | * @buffer: The buffer to grab a reference for, may be NULL | |
1209 | * | |
1210 | * Returns the pointer to the buffer that was passed into the function. | |
1211 | */ | |
1212 | struct iio_buffer *iio_buffer_get(struct iio_buffer *buffer) | |
1213 | { | |
1214 | if (buffer) | |
1215 | kref_get(&buffer->ref); | |
1216 | ||
1217 | return buffer; | |
1218 | } | |
1219 | EXPORT_SYMBOL_GPL(iio_buffer_get); | |
1220 | ||
1221 | /** | |
1222 | * iio_buffer_put() - Release the reference to the buffer | |
1223 | * @buffer: The buffer to release the reference for, may be NULL | |
1224 | */ | |
1225 | void iio_buffer_put(struct iio_buffer *buffer) | |
1226 | { | |
1227 | if (buffer) | |
1228 | kref_put(&buffer->ref, iio_buffer_release); | |
1229 | } | |
1230 | EXPORT_SYMBOL_GPL(iio_buffer_put); |