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 | ||
f4f4673b OP |
45 | static int iio_buffer_flush_hwfifo(struct iio_dev *indio_dev, |
46 | struct iio_buffer *buf, size_t required) | |
47 | { | |
48 | if (!indio_dev->info->hwfifo_flush_to_buffer) | |
49 | return -ENODEV; | |
50 | ||
51 | return indio_dev->info->hwfifo_flush_to_buffer(indio_dev, required); | |
52 | } | |
53 | ||
37d34556 | 54 | static bool iio_buffer_ready(struct iio_dev *indio_dev, struct iio_buffer *buf, |
f4f4673b | 55 | size_t to_wait, int to_flush) |
37d34556 | 56 | { |
f4f4673b OP |
57 | size_t avail; |
58 | int flushed = 0; | |
59 | ||
37d34556 JC |
60 | /* wakeup if the device was unregistered */ |
61 | if (!indio_dev->info) | |
62 | return true; | |
63 | ||
64 | /* drain the buffer if it was disabled */ | |
f4f4673b | 65 | if (!iio_buffer_is_active(buf)) { |
37d34556 | 66 | to_wait = min_t(size_t, to_wait, 1); |
f4f4673b OP |
67 | to_flush = 0; |
68 | } | |
69 | ||
70 | avail = iio_buffer_data_available(buf); | |
37d34556 | 71 | |
f4f4673b OP |
72 | if (avail >= to_wait) { |
73 | /* force a flush for non-blocking reads */ | |
74 | if (!to_wait && !avail && to_flush) | |
75 | iio_buffer_flush_hwfifo(indio_dev, buf, to_flush); | |
76 | return true; | |
77 | } | |
78 | ||
79 | if (to_flush) | |
80 | flushed = iio_buffer_flush_hwfifo(indio_dev, buf, | |
81 | to_wait - avail); | |
82 | if (flushed <= 0) | |
83 | return false; | |
84 | ||
85 | if (avail + flushed >= to_wait) | |
37d34556 JC |
86 | return true; |
87 | ||
88 | return false; | |
89 | } | |
90 | ||
7026ea4b | 91 | /** |
14555b14 | 92 | * iio_buffer_read_first_n_outer() - chrdev read for buffer access |
7026ea4b | 93 | * |
14555b14 JC |
94 | * This function relies on all buffer implementations having an |
95 | * iio_buffer as their first element. | |
7026ea4b | 96 | **/ |
14555b14 JC |
97 | ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf, |
98 | size_t n, loff_t *f_ps) | |
7026ea4b | 99 | { |
1aa04278 | 100 | struct iio_dev *indio_dev = filp->private_data; |
14555b14 | 101 | struct iio_buffer *rb = indio_dev->buffer; |
37d34556 JC |
102 | size_t datum_size; |
103 | size_t to_wait = 0; | |
f4f4673b | 104 | size_t to_read; |
ee551a10 | 105 | int ret; |
d5857d65 | 106 | |
f18e7a06 LPC |
107 | if (!indio_dev->info) |
108 | return -ENODEV; | |
109 | ||
96e00f11 | 110 | if (!rb || !rb->access->read_first_n) |
7026ea4b | 111 | return -EINVAL; |
ee551a10 | 112 | |
37d34556 JC |
113 | datum_size = rb->bytes_per_datum; |
114 | ||
115 | /* | |
116 | * If datum_size is 0 there will never be anything to read from the | |
117 | * buffer, so signal end of file now. | |
118 | */ | |
119 | if (!datum_size) | |
120 | return 0; | |
121 | ||
f4f4673b OP |
122 | to_read = min_t(size_t, n / datum_size, rb->watermark); |
123 | ||
37d34556 | 124 | if (!(filp->f_flags & O_NONBLOCK)) |
f4f4673b | 125 | to_wait = to_read; |
37d34556 | 126 | |
ee551a10 | 127 | do { |
37d34556 | 128 | ret = wait_event_interruptible(rb->pollq, |
f4f4673b | 129 | iio_buffer_ready(indio_dev, rb, to_wait, to_read)); |
37d34556 JC |
130 | if (ret) |
131 | return ret; | |
ee551a10 | 132 | |
37d34556 JC |
133 | if (!indio_dev->info) |
134 | return -ENODEV; | |
ee551a10 LPC |
135 | |
136 | ret = rb->access->read_first_n(rb, n, buf); | |
137 | if (ret == 0 && (filp->f_flags & O_NONBLOCK)) | |
138 | ret = -EAGAIN; | |
139 | } while (ret == 0); | |
140 | ||
141 | return ret; | |
7026ea4b JC |
142 | } |
143 | ||
a7348347 | 144 | /** |
14555b14 | 145 | * iio_buffer_poll() - poll the buffer to find out if it has data |
a7348347 | 146 | */ |
14555b14 JC |
147 | unsigned int iio_buffer_poll(struct file *filp, |
148 | struct poll_table_struct *wait) | |
a7348347 | 149 | { |
1aa04278 | 150 | struct iio_dev *indio_dev = filp->private_data; |
14555b14 | 151 | struct iio_buffer *rb = indio_dev->buffer; |
a7348347 | 152 | |
f18e7a06 LPC |
153 | if (!indio_dev->info) |
154 | return -ENODEV; | |
155 | ||
a7348347 | 156 | poll_wait(filp, &rb->pollq, wait); |
f4f4673b | 157 | if (iio_buffer_ready(indio_dev, rb, rb->watermark, 0)) |
a7348347 | 158 | return POLLIN | POLLRDNORM; |
8d213f24 | 159 | return 0; |
a7348347 JC |
160 | } |
161 | ||
d2f0a48f LPC |
162 | /** |
163 | * iio_buffer_wakeup_poll - Wakes up the buffer waitqueue | |
164 | * @indio_dev: The IIO device | |
165 | * | |
166 | * Wakes up the event waitqueue used for poll(). Should usually | |
167 | * be called when the device is unregistered. | |
168 | */ | |
169 | void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) | |
170 | { | |
171 | if (!indio_dev->buffer) | |
172 | return; | |
173 | ||
174 | wake_up(&indio_dev->buffer->pollq); | |
175 | } | |
176 | ||
f79a9098 | 177 | void iio_buffer_init(struct iio_buffer *buffer) |
7026ea4b | 178 | { |
5ada4ea9 | 179 | INIT_LIST_HEAD(&buffer->demux_list); |
705ee2c9 | 180 | INIT_LIST_HEAD(&buffer->buffer_list); |
14555b14 | 181 | init_waitqueue_head(&buffer->pollq); |
9e69c935 | 182 | kref_init(&buffer->ref); |
37d34556 | 183 | buffer->watermark = 1; |
7026ea4b | 184 | } |
14555b14 | 185 | EXPORT_SYMBOL(iio_buffer_init); |
7026ea4b | 186 | |
1d892719 | 187 | static ssize_t iio_show_scan_index(struct device *dev, |
8d213f24 JC |
188 | struct device_attribute *attr, |
189 | char *buf) | |
1d892719 | 190 | { |
8d213f24 | 191 | return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index); |
1d892719 JC |
192 | } |
193 | ||
194 | static ssize_t iio_show_fixed_type(struct device *dev, | |
195 | struct device_attribute *attr, | |
196 | char *buf) | |
197 | { | |
198 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
8310b86c JC |
199 | u8 type = this_attr->c->scan_type.endianness; |
200 | ||
201 | if (type == IIO_CPU) { | |
9d5d1153 JC |
202 | #ifdef __LITTLE_ENDIAN |
203 | type = IIO_LE; | |
204 | #else | |
205 | type = IIO_BE; | |
206 | #endif | |
8310b86c | 207 | } |
0ee8546a SP |
208 | if (this_attr->c->scan_type.repeat > 1) |
209 | return sprintf(buf, "%s:%c%d/%dX%d>>%u\n", | |
210 | iio_endian_prefix[type], | |
211 | this_attr->c->scan_type.sign, | |
212 | this_attr->c->scan_type.realbits, | |
213 | this_attr->c->scan_type.storagebits, | |
214 | this_attr->c->scan_type.repeat, | |
215 | this_attr->c->scan_type.shift); | |
216 | else | |
217 | return sprintf(buf, "%s:%c%d/%d>>%u\n", | |
8310b86c | 218 | iio_endian_prefix[type], |
1d892719 JC |
219 | this_attr->c->scan_type.sign, |
220 | this_attr->c->scan_type.realbits, | |
221 | this_attr->c->scan_type.storagebits, | |
222 | this_attr->c->scan_type.shift); | |
223 | } | |
224 | ||
8d213f24 JC |
225 | static ssize_t iio_scan_el_show(struct device *dev, |
226 | struct device_attribute *attr, | |
227 | char *buf) | |
228 | { | |
229 | int ret; | |
e53f5ac5 | 230 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
8d213f24 | 231 | |
2076a20f AB |
232 | /* Ensure ret is 0 or 1. */ |
233 | ret = !!test_bit(to_iio_dev_attr(attr)->address, | |
5ada4ea9 JC |
234 | indio_dev->buffer->scan_mask); |
235 | ||
8d213f24 JC |
236 | return sprintf(buf, "%d\n", ret); |
237 | } | |
238 | ||
217a5cf0 LPC |
239 | /* Note NULL used as error indicator as it doesn't make sense. */ |
240 | static const unsigned long *iio_scan_mask_match(const unsigned long *av_masks, | |
241 | unsigned int masklength, | |
1e1ec286 LPC |
242 | const unsigned long *mask, |
243 | bool strict) | |
217a5cf0 LPC |
244 | { |
245 | if (bitmap_empty(mask, masklength)) | |
246 | return NULL; | |
247 | while (*av_masks) { | |
1e1ec286 LPC |
248 | if (strict) { |
249 | if (bitmap_equal(mask, av_masks, masklength)) | |
250 | return av_masks; | |
251 | } else { | |
252 | if (bitmap_subset(mask, av_masks, masklength)) | |
253 | return av_masks; | |
254 | } | |
217a5cf0 LPC |
255 | av_masks += BITS_TO_LONGS(masklength); |
256 | } | |
257 | return NULL; | |
258 | } | |
259 | ||
260 | static bool iio_validate_scan_mask(struct iio_dev *indio_dev, | |
261 | const unsigned long *mask) | |
262 | { | |
263 | if (!indio_dev->setup_ops->validate_scan_mask) | |
264 | return true; | |
265 | ||
266 | return indio_dev->setup_ops->validate_scan_mask(indio_dev, mask); | |
267 | } | |
268 | ||
269 | /** | |
270 | * iio_scan_mask_set() - set particular bit in the scan mask | |
271 | * @indio_dev: the iio device | |
272 | * @buffer: the buffer whose scan mask we are interested in | |
273 | * @bit: the bit to be set. | |
274 | * | |
275 | * Note that at this point we have no way of knowing what other | |
276 | * buffers might request, hence this code only verifies that the | |
277 | * individual buffers request is plausible. | |
278 | */ | |
279 | static int iio_scan_mask_set(struct iio_dev *indio_dev, | |
280 | struct iio_buffer *buffer, int bit) | |
281 | { | |
282 | const unsigned long *mask; | |
283 | unsigned long *trialmask; | |
284 | ||
285 | trialmask = kmalloc(sizeof(*trialmask)* | |
286 | BITS_TO_LONGS(indio_dev->masklength), | |
287 | GFP_KERNEL); | |
288 | ||
289 | if (trialmask == NULL) | |
290 | return -ENOMEM; | |
291 | if (!indio_dev->masklength) { | |
292 | WARN_ON("Trying to set scanmask prior to registering buffer\n"); | |
293 | goto err_invalid_mask; | |
294 | } | |
295 | bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength); | |
296 | set_bit(bit, trialmask); | |
297 | ||
298 | if (!iio_validate_scan_mask(indio_dev, trialmask)) | |
299 | goto err_invalid_mask; | |
300 | ||
301 | if (indio_dev->available_scan_masks) { | |
302 | mask = iio_scan_mask_match(indio_dev->available_scan_masks, | |
303 | indio_dev->masklength, | |
1e1ec286 | 304 | trialmask, false); |
217a5cf0 LPC |
305 | if (!mask) |
306 | goto err_invalid_mask; | |
307 | } | |
308 | bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength); | |
309 | ||
310 | kfree(trialmask); | |
311 | ||
312 | return 0; | |
313 | ||
314 | err_invalid_mask: | |
315 | kfree(trialmask); | |
316 | return -EINVAL; | |
317 | } | |
318 | ||
14555b14 | 319 | static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit) |
8d213f24 | 320 | { |
14555b14 | 321 | clear_bit(bit, buffer->scan_mask); |
8d213f24 JC |
322 | return 0; |
323 | } | |
324 | ||
325 | static ssize_t iio_scan_el_store(struct device *dev, | |
326 | struct device_attribute *attr, | |
327 | const char *buf, | |
328 | size_t len) | |
329 | { | |
a714af27 | 330 | int ret; |
8d213f24 | 331 | bool state; |
e53f5ac5 | 332 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 333 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 JC |
334 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
335 | ||
a714af27 JC |
336 | ret = strtobool(buf, &state); |
337 | if (ret < 0) | |
338 | return ret; | |
8d213f24 | 339 | mutex_lock(&indio_dev->mlock); |
705ee2c9 | 340 | if (iio_buffer_is_active(indio_dev->buffer)) { |
8d213f24 JC |
341 | ret = -EBUSY; |
342 | goto error_ret; | |
343 | } | |
f79a9098 | 344 | ret = iio_scan_mask_query(indio_dev, buffer, this_attr->address); |
8d213f24 JC |
345 | if (ret < 0) |
346 | goto error_ret; | |
347 | if (!state && ret) { | |
14555b14 | 348 | ret = iio_scan_mask_clear(buffer, this_attr->address); |
8d213f24 JC |
349 | if (ret) |
350 | goto error_ret; | |
351 | } else if (state && !ret) { | |
f79a9098 | 352 | ret = iio_scan_mask_set(indio_dev, buffer, this_attr->address); |
8d213f24 JC |
353 | if (ret) |
354 | goto error_ret; | |
355 | } | |
356 | ||
357 | error_ret: | |
358 | mutex_unlock(&indio_dev->mlock); | |
359 | ||
5a2a6e11 | 360 | return ret < 0 ? ret : len; |
8d213f24 JC |
361 | |
362 | } | |
363 | ||
364 | static ssize_t iio_scan_el_ts_show(struct device *dev, | |
365 | struct device_attribute *attr, | |
366 | char *buf) | |
367 | { | |
e53f5ac5 | 368 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
f8c6f4e9 | 369 | return sprintf(buf, "%d\n", indio_dev->buffer->scan_timestamp); |
8d213f24 JC |
370 | } |
371 | ||
372 | static ssize_t iio_scan_el_ts_store(struct device *dev, | |
373 | struct device_attribute *attr, | |
374 | const char *buf, | |
375 | size_t len) | |
376 | { | |
a714af27 | 377 | int ret; |
e53f5ac5 | 378 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
8d213f24 | 379 | bool state; |
1aa04278 | 380 | |
a714af27 JC |
381 | ret = strtobool(buf, &state); |
382 | if (ret < 0) | |
383 | return ret; | |
384 | ||
8d213f24 | 385 | mutex_lock(&indio_dev->mlock); |
705ee2c9 | 386 | if (iio_buffer_is_active(indio_dev->buffer)) { |
8d213f24 JC |
387 | ret = -EBUSY; |
388 | goto error_ret; | |
389 | } | |
14555b14 | 390 | indio_dev->buffer->scan_timestamp = state; |
8d213f24 JC |
391 | error_ret: |
392 | mutex_unlock(&indio_dev->mlock); | |
393 | ||
394 | return ret ? ret : len; | |
395 | } | |
396 | ||
14555b14 JC |
397 | static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev, |
398 | const struct iio_chan_spec *chan) | |
1d892719 | 399 | { |
26d25ae3 | 400 | int ret, attrcount = 0; |
14555b14 | 401 | struct iio_buffer *buffer = indio_dev->buffer; |
1d892719 | 402 | |
26d25ae3 | 403 | ret = __iio_add_chan_devattr("index", |
1d892719 JC |
404 | chan, |
405 | &iio_show_scan_index, | |
406 | NULL, | |
407 | 0, | |
3704432f | 408 | IIO_SEPARATE, |
1aa04278 | 409 | &indio_dev->dev, |
14555b14 | 410 | &buffer->scan_el_dev_attr_list); |
1d892719 | 411 | if (ret) |
92825ff9 | 412 | return ret; |
26d25ae3 JC |
413 | attrcount++; |
414 | ret = __iio_add_chan_devattr("type", | |
1d892719 JC |
415 | chan, |
416 | &iio_show_fixed_type, | |
417 | NULL, | |
418 | 0, | |
419 | 0, | |
1aa04278 | 420 | &indio_dev->dev, |
14555b14 | 421 | &buffer->scan_el_dev_attr_list); |
1d892719 | 422 | if (ret) |
92825ff9 | 423 | return ret; |
26d25ae3 | 424 | attrcount++; |
a88b3ebc | 425 | if (chan->type != IIO_TIMESTAMP) |
26d25ae3 | 426 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
427 | chan, |
428 | &iio_scan_el_show, | |
429 | &iio_scan_el_store, | |
430 | chan->scan_index, | |
431 | 0, | |
1aa04278 | 432 | &indio_dev->dev, |
14555b14 | 433 | &buffer->scan_el_dev_attr_list); |
a88b3ebc | 434 | else |
26d25ae3 | 435 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
436 | chan, |
437 | &iio_scan_el_ts_show, | |
438 | &iio_scan_el_ts_store, | |
439 | chan->scan_index, | |
440 | 0, | |
1aa04278 | 441 | &indio_dev->dev, |
14555b14 | 442 | &buffer->scan_el_dev_attr_list); |
9572588c | 443 | if (ret) |
92825ff9 | 444 | return ret; |
26d25ae3 JC |
445 | attrcount++; |
446 | ret = attrcount; | |
1d892719 JC |
447 | return ret; |
448 | } | |
449 | ||
08e7e0ad LPC |
450 | static ssize_t iio_buffer_read_length(struct device *dev, |
451 | struct device_attribute *attr, | |
452 | char *buf) | |
7026ea4b | 453 | { |
e53f5ac5 | 454 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 455 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 456 | |
37495660 | 457 | return sprintf(buf, "%d\n", buffer->length); |
7026ea4b | 458 | } |
7026ea4b | 459 | |
08e7e0ad LPC |
460 | static ssize_t iio_buffer_write_length(struct device *dev, |
461 | struct device_attribute *attr, | |
462 | const char *buf, size_t len) | |
7026ea4b | 463 | { |
e53f5ac5 | 464 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 465 | struct iio_buffer *buffer = indio_dev->buffer; |
948ad205 LPC |
466 | unsigned int val; |
467 | int ret; | |
8d213f24 | 468 | |
948ad205 | 469 | ret = kstrtouint(buf, 10, &val); |
7026ea4b JC |
470 | if (ret) |
471 | return ret; | |
472 | ||
37495660 LPC |
473 | if (val == buffer->length) |
474 | return len; | |
7026ea4b | 475 | |
e38c79e0 | 476 | mutex_lock(&indio_dev->mlock); |
705ee2c9 | 477 | if (iio_buffer_is_active(indio_dev->buffer)) { |
e38c79e0 LPC |
478 | ret = -EBUSY; |
479 | } else { | |
8d92db28 | 480 | buffer->access->set_length(buffer, val); |
e38c79e0 | 481 | ret = 0; |
7026ea4b | 482 | } |
37d34556 JC |
483 | if (ret) |
484 | goto out; | |
485 | if (buffer->length && buffer->length < buffer->watermark) | |
486 | buffer->watermark = buffer->length; | |
487 | out: | |
e38c79e0 | 488 | mutex_unlock(&indio_dev->mlock); |
7026ea4b | 489 | |
e38c79e0 | 490 | return ret ? ret : len; |
7026ea4b | 491 | } |
7026ea4b | 492 | |
08e7e0ad LPC |
493 | static ssize_t iio_buffer_show_enable(struct device *dev, |
494 | struct device_attribute *attr, | |
495 | char *buf) | |
7026ea4b | 496 | { |
e53f5ac5 | 497 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
705ee2c9 | 498 | return sprintf(buf, "%d\n", iio_buffer_is_active(indio_dev->buffer)); |
7026ea4b | 499 | } |
7026ea4b | 500 | |
183f4173 PM |
501 | static int iio_compute_scan_bytes(struct iio_dev *indio_dev, |
502 | const unsigned long *mask, bool timestamp) | |
959d2952 | 503 | { |
959d2952 JC |
504 | const struct iio_chan_spec *ch; |
505 | unsigned bytes = 0; | |
506 | int length, i; | |
959d2952 JC |
507 | |
508 | /* How much space will the demuxed element take? */ | |
6b3b58ed | 509 | for_each_set_bit(i, mask, |
959d2952 JC |
510 | indio_dev->masklength) { |
511 | ch = iio_find_channel_from_si(indio_dev, i); | |
0ee8546a SP |
512 | if (ch->scan_type.repeat > 1) |
513 | length = ch->scan_type.storagebits / 8 * | |
514 | ch->scan_type.repeat; | |
515 | else | |
516 | length = ch->scan_type.storagebits / 8; | |
959d2952 JC |
517 | bytes = ALIGN(bytes, length); |
518 | bytes += length; | |
519 | } | |
6b3b58ed | 520 | if (timestamp) { |
959d2952 | 521 | ch = iio_find_channel_from_si(indio_dev, |
f1264809 | 522 | indio_dev->scan_index_timestamp); |
0ee8546a SP |
523 | if (ch->scan_type.repeat > 1) |
524 | length = ch->scan_type.storagebits / 8 * | |
525 | ch->scan_type.repeat; | |
526 | else | |
527 | length = ch->scan_type.storagebits / 8; | |
959d2952 JC |
528 | bytes = ALIGN(bytes, length); |
529 | bytes += length; | |
530 | } | |
6b3b58ed JC |
531 | return bytes; |
532 | } | |
533 | ||
9e69c935 LPC |
534 | static void iio_buffer_activate(struct iio_dev *indio_dev, |
535 | struct iio_buffer *buffer) | |
536 | { | |
537 | iio_buffer_get(buffer); | |
538 | list_add(&buffer->buffer_list, &indio_dev->buffer_list); | |
539 | } | |
540 | ||
541 | static void iio_buffer_deactivate(struct iio_buffer *buffer) | |
542 | { | |
543 | list_del_init(&buffer->buffer_list); | |
37d34556 | 544 | wake_up_interruptible(&buffer->pollq); |
9e69c935 LPC |
545 | iio_buffer_put(buffer); |
546 | } | |
547 | ||
1250186a LPC |
548 | static void iio_buffer_deactivate_all(struct iio_dev *indio_dev) |
549 | { | |
550 | struct iio_buffer *buffer, *_buffer; | |
551 | ||
552 | list_for_each_entry_safe(buffer, _buffer, | |
553 | &indio_dev->buffer_list, buffer_list) | |
554 | iio_buffer_deactivate(buffer); | |
555 | } | |
556 | ||
8e050996 LPC |
557 | static void iio_buffer_update_bytes_per_datum(struct iio_dev *indio_dev, |
558 | struct iio_buffer *buffer) | |
559 | { | |
560 | unsigned int bytes; | |
561 | ||
562 | if (!buffer->access->set_bytes_per_datum) | |
563 | return; | |
564 | ||
565 | bytes = iio_compute_scan_bytes(indio_dev, buffer->scan_mask, | |
566 | buffer->scan_timestamp); | |
567 | ||
568 | buffer->access->set_bytes_per_datum(buffer, bytes); | |
569 | } | |
570 | ||
fcc1b2f5 LPC |
571 | static int iio_buffer_request_update(struct iio_dev *indio_dev, |
572 | struct iio_buffer *buffer) | |
573 | { | |
574 | int ret; | |
575 | ||
576 | iio_buffer_update_bytes_per_datum(indio_dev, buffer); | |
577 | if (buffer->access->request_update) { | |
578 | ret = buffer->access->request_update(buffer); | |
579 | if (ret) { | |
580 | dev_dbg(&indio_dev->dev, | |
581 | "Buffer not started: buffer parameter update failed (%d)\n", | |
582 | ret); | |
583 | return ret; | |
584 | } | |
585 | } | |
586 | ||
587 | return 0; | |
588 | } | |
589 | ||
248be5aa LPC |
590 | static void iio_free_scan_mask(struct iio_dev *indio_dev, |
591 | const unsigned long *mask) | |
592 | { | |
593 | /* If the mask is dynamically allocated free it, otherwise do nothing */ | |
594 | if (!indio_dev->available_scan_masks) | |
595 | kfree(mask); | |
596 | } | |
597 | ||
6e509c4d LPC |
598 | struct iio_device_config { |
599 | unsigned int mode; | |
600 | const unsigned long *scan_mask; | |
601 | unsigned int scan_bytes; | |
602 | bool scan_timestamp; | |
603 | }; | |
604 | ||
605 | static int iio_verify_update(struct iio_dev *indio_dev, | |
606 | struct iio_buffer *insert_buffer, struct iio_buffer *remove_buffer, | |
607 | struct iio_device_config *config) | |
608 | { | |
609 | unsigned long *compound_mask; | |
610 | const unsigned long *scan_mask; | |
1e1ec286 | 611 | bool strict_scanmask = false; |
6e509c4d LPC |
612 | struct iio_buffer *buffer; |
613 | bool scan_timestamp; | |
225d59ad | 614 | unsigned int modes; |
6e509c4d LPC |
615 | |
616 | memset(config, 0, sizeof(*config)); | |
617 | ||
618 | /* | |
619 | * If there is just one buffer and we are removing it there is nothing | |
620 | * to verify. | |
621 | */ | |
622 | if (remove_buffer && !insert_buffer && | |
623 | list_is_singular(&indio_dev->buffer_list)) | |
624 | return 0; | |
625 | ||
225d59ad LPC |
626 | modes = indio_dev->modes; |
627 | ||
628 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { | |
629 | if (buffer == remove_buffer) | |
630 | continue; | |
631 | modes &= buffer->access->modes; | |
632 | } | |
633 | ||
634 | if (insert_buffer) | |
635 | modes &= insert_buffer->access->modes; | |
636 | ||
6e509c4d | 637 | /* Definitely possible for devices to support both of these. */ |
225d59ad | 638 | if ((modes & INDIO_BUFFER_TRIGGERED) && indio_dev->trig) { |
6e509c4d | 639 | config->mode = INDIO_BUFFER_TRIGGERED; |
225d59ad | 640 | } else if (modes & INDIO_BUFFER_HARDWARE) { |
1e1ec286 LPC |
641 | /* |
642 | * Keep things simple for now and only allow a single buffer to | |
643 | * be connected in hardware mode. | |
644 | */ | |
645 | if (insert_buffer && !list_empty(&indio_dev->buffer_list)) | |
646 | return -EINVAL; | |
6e509c4d | 647 | config->mode = INDIO_BUFFER_HARDWARE; |
1e1ec286 | 648 | strict_scanmask = true; |
225d59ad | 649 | } else if (modes & INDIO_BUFFER_SOFTWARE) { |
6e509c4d LPC |
650 | config->mode = INDIO_BUFFER_SOFTWARE; |
651 | } else { | |
652 | /* Can only occur on first buffer */ | |
653 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) | |
654 | dev_dbg(&indio_dev->dev, "Buffer not started: no trigger\n"); | |
655 | return -EINVAL; | |
656 | } | |
657 | ||
658 | /* What scan mask do we actually have? */ | |
659 | compound_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), | |
660 | sizeof(long), GFP_KERNEL); | |
661 | if (compound_mask == NULL) | |
662 | return -ENOMEM; | |
663 | ||
664 | scan_timestamp = false; | |
665 | ||
666 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { | |
667 | if (buffer == remove_buffer) | |
668 | continue; | |
669 | bitmap_or(compound_mask, compound_mask, buffer->scan_mask, | |
670 | indio_dev->masklength); | |
671 | scan_timestamp |= buffer->scan_timestamp; | |
672 | } | |
673 | ||
674 | if (insert_buffer) { | |
675 | bitmap_or(compound_mask, compound_mask, | |
676 | insert_buffer->scan_mask, indio_dev->masklength); | |
677 | scan_timestamp |= insert_buffer->scan_timestamp; | |
678 | } | |
679 | ||
680 | if (indio_dev->available_scan_masks) { | |
681 | scan_mask = iio_scan_mask_match(indio_dev->available_scan_masks, | |
682 | indio_dev->masklength, | |
1e1ec286 LPC |
683 | compound_mask, |
684 | strict_scanmask); | |
6e509c4d LPC |
685 | kfree(compound_mask); |
686 | if (scan_mask == NULL) | |
687 | return -EINVAL; | |
688 | } else { | |
689 | scan_mask = compound_mask; | |
690 | } | |
691 | ||
692 | config->scan_bytes = iio_compute_scan_bytes(indio_dev, | |
693 | scan_mask, scan_timestamp); | |
694 | config->scan_mask = scan_mask; | |
695 | config->scan_timestamp = scan_timestamp; | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
623d74e3 LPC |
700 | static int iio_enable_buffers(struct iio_dev *indio_dev, |
701 | struct iio_device_config *config) | |
6b3b58ed | 702 | { |
84b36ce5 | 703 | int ret; |
fcc1b2f5 | 704 | |
623d74e3 LPC |
705 | indio_dev->active_scan_mask = config->scan_mask; |
706 | indio_dev->scan_timestamp = config->scan_timestamp; | |
707 | indio_dev->scan_bytes = config->scan_bytes; | |
aff1eb4e | 708 | |
5ada4ea9 JC |
709 | iio_update_demux(indio_dev); |
710 | ||
84b36ce5 JC |
711 | /* Wind up again */ |
712 | if (indio_dev->setup_ops->preenable) { | |
713 | ret = indio_dev->setup_ops->preenable(indio_dev); | |
714 | if (ret) { | |
63223c5f | 715 | dev_dbg(&indio_dev->dev, |
bec1889d | 716 | "Buffer not started: buffer preenable failed (%d)\n", ret); |
623d74e3 | 717 | goto err_undo_config; |
84b36ce5 JC |
718 | } |
719 | } | |
6e509c4d | 720 | |
84b36ce5 JC |
721 | if (indio_dev->info->update_scan_mode) { |
722 | ret = indio_dev->info | |
5ada4ea9 JC |
723 | ->update_scan_mode(indio_dev, |
724 | indio_dev->active_scan_mask); | |
84b36ce5 | 725 | if (ret < 0) { |
63223c5f LPC |
726 | dev_dbg(&indio_dev->dev, |
727 | "Buffer not started: update scan mode failed (%d)\n", | |
728 | ret); | |
623d74e3 | 729 | goto err_run_postdisable; |
84b36ce5 JC |
730 | } |
731 | } | |
6e509c4d | 732 | |
623d74e3 | 733 | indio_dev->currentmode = config->mode; |
84b36ce5 JC |
734 | |
735 | if (indio_dev->setup_ops->postenable) { | |
736 | ret = indio_dev->setup_ops->postenable(indio_dev); | |
737 | if (ret) { | |
63223c5f | 738 | dev_dbg(&indio_dev->dev, |
bec1889d | 739 | "Buffer not started: postenable failed (%d)\n", ret); |
623d74e3 | 740 | goto err_run_postdisable; |
84b36ce5 JC |
741 | } |
742 | } | |
743 | ||
6e509c4d | 744 | return 0; |
84b36ce5 | 745 | |
623d74e3 | 746 | err_run_postdisable: |
84b36ce5 | 747 | indio_dev->currentmode = INDIO_DIRECT_MODE; |
84b36ce5 JC |
748 | if (indio_dev->setup_ops->postdisable) |
749 | indio_dev->setup_ops->postdisable(indio_dev); | |
623d74e3 LPC |
750 | err_undo_config: |
751 | indio_dev->active_scan_mask = NULL; | |
752 | ||
84b36ce5 | 753 | return ret; |
623d74e3 LPC |
754 | } |
755 | ||
756 | static int iio_disable_buffers(struct iio_dev *indio_dev) | |
757 | { | |
1250186a LPC |
758 | int ret = 0; |
759 | int ret2; | |
623d74e3 LPC |
760 | |
761 | /* Wind down existing buffers - iff there are any */ | |
762 | if (list_empty(&indio_dev->buffer_list)) | |
763 | return 0; | |
764 | ||
1250186a LPC |
765 | /* |
766 | * If things go wrong at some step in disable we still need to continue | |
767 | * to perform the other steps, otherwise we leave the device in a | |
768 | * inconsistent state. We return the error code for the first error we | |
769 | * encountered. | |
770 | */ | |
771 | ||
623d74e3 | 772 | if (indio_dev->setup_ops->predisable) { |
1250186a LPC |
773 | ret2 = indio_dev->setup_ops->predisable(indio_dev); |
774 | if (ret2 && !ret) | |
775 | ret = ret2; | |
623d74e3 LPC |
776 | } |
777 | ||
778 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
779 | ||
780 | if (indio_dev->setup_ops->postdisable) { | |
1250186a LPC |
781 | ret2 = indio_dev->setup_ops->postdisable(indio_dev); |
782 | if (ret2 && !ret) | |
783 | ret = ret2; | |
623d74e3 LPC |
784 | } |
785 | ||
1250186a LPC |
786 | iio_free_scan_mask(indio_dev, indio_dev->active_scan_mask); |
787 | indio_dev->active_scan_mask = NULL; | |
788 | ||
789 | return ret; | |
623d74e3 LPC |
790 | } |
791 | ||
792 | static int __iio_update_buffers(struct iio_dev *indio_dev, | |
793 | struct iio_buffer *insert_buffer, | |
794 | struct iio_buffer *remove_buffer) | |
795 | { | |
623d74e3 | 796 | struct iio_device_config new_config; |
1250186a | 797 | int ret; |
623d74e3 LPC |
798 | |
799 | ret = iio_verify_update(indio_dev, insert_buffer, remove_buffer, | |
800 | &new_config); | |
801 | if (ret) | |
802 | return ret; | |
803 | ||
804 | if (insert_buffer) { | |
805 | ret = iio_buffer_request_update(indio_dev, insert_buffer); | |
806 | if (ret) | |
807 | goto err_free_config; | |
808 | } | |
809 | ||
623d74e3 | 810 | ret = iio_disable_buffers(indio_dev); |
1250186a LPC |
811 | if (ret) |
812 | goto err_deactivate_all; | |
623d74e3 LPC |
813 | |
814 | if (remove_buffer) | |
815 | iio_buffer_deactivate(remove_buffer); | |
816 | if (insert_buffer) | |
817 | iio_buffer_activate(indio_dev, insert_buffer); | |
818 | ||
819 | /* If no buffers in list, we are done */ | |
1250186a | 820 | if (list_empty(&indio_dev->buffer_list)) |
623d74e3 | 821 | return 0; |
623d74e3 LPC |
822 | |
823 | ret = iio_enable_buffers(indio_dev, &new_config); | |
1250186a LPC |
824 | if (ret) |
825 | goto err_deactivate_all; | |
623d74e3 | 826 | |
623d74e3 | 827 | return 0; |
6e509c4d | 828 | |
1250186a LPC |
829 | err_deactivate_all: |
830 | /* | |
831 | * We've already verified that the config is valid earlier. If things go | |
832 | * wrong in either enable or disable the most likely reason is an IO | |
833 | * error from the device. In this case there is no good recovery | |
834 | * strategy. Just make sure to disable everything and leave the device | |
835 | * in a sane state. With a bit of luck the device might come back to | |
836 | * life again later and userspace can try again. | |
837 | */ | |
838 | iio_buffer_deactivate_all(indio_dev); | |
839 | ||
6e509c4d LPC |
840 | err_free_config: |
841 | iio_free_scan_mask(indio_dev, new_config.scan_mask); | |
842 | return ret; | |
84b36ce5 | 843 | } |
a9519456 LPC |
844 | |
845 | int iio_update_buffers(struct iio_dev *indio_dev, | |
846 | struct iio_buffer *insert_buffer, | |
847 | struct iio_buffer *remove_buffer) | |
848 | { | |
849 | int ret; | |
850 | ||
3909fab5 LPC |
851 | if (insert_buffer == remove_buffer) |
852 | return 0; | |
853 | ||
a9519456 LPC |
854 | mutex_lock(&indio_dev->info_exist_lock); |
855 | mutex_lock(&indio_dev->mlock); | |
856 | ||
3909fab5 LPC |
857 | if (insert_buffer && iio_buffer_is_active(insert_buffer)) |
858 | insert_buffer = NULL; | |
859 | ||
860 | if (remove_buffer && !iio_buffer_is_active(remove_buffer)) | |
861 | remove_buffer = NULL; | |
862 | ||
863 | if (!insert_buffer && !remove_buffer) { | |
864 | ret = 0; | |
865 | goto out_unlock; | |
866 | } | |
867 | ||
a9519456 LPC |
868 | if (indio_dev->info == NULL) { |
869 | ret = -ENODEV; | |
870 | goto out_unlock; | |
871 | } | |
872 | ||
873 | ret = __iio_update_buffers(indio_dev, insert_buffer, remove_buffer); | |
874 | ||
875 | out_unlock: | |
876 | mutex_unlock(&indio_dev->mlock); | |
877 | mutex_unlock(&indio_dev->info_exist_lock); | |
878 | ||
879 | return ret; | |
880 | } | |
84b36ce5 JC |
881 | EXPORT_SYMBOL_GPL(iio_update_buffers); |
882 | ||
623d74e3 LPC |
883 | void iio_disable_all_buffers(struct iio_dev *indio_dev) |
884 | { | |
623d74e3 | 885 | iio_disable_buffers(indio_dev); |
1250186a | 886 | iio_buffer_deactivate_all(indio_dev); |
623d74e3 LPC |
887 | } |
888 | ||
08e7e0ad LPC |
889 | static ssize_t iio_buffer_store_enable(struct device *dev, |
890 | struct device_attribute *attr, | |
891 | const char *buf, | |
892 | size_t len) | |
84b36ce5 JC |
893 | { |
894 | int ret; | |
895 | bool requested_state; | |
896 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
84b36ce5 JC |
897 | bool inlist; |
898 | ||
899 | ret = strtobool(buf, &requested_state); | |
900 | if (ret < 0) | |
901 | return ret; | |
902 | ||
903 | mutex_lock(&indio_dev->mlock); | |
904 | ||
905 | /* Find out if it is in the list */ | |
705ee2c9 | 906 | inlist = iio_buffer_is_active(indio_dev->buffer); |
84b36ce5 JC |
907 | /* Already in desired state */ |
908 | if (inlist == requested_state) | |
909 | goto done; | |
910 | ||
911 | if (requested_state) | |
a9519456 | 912 | ret = __iio_update_buffers(indio_dev, |
84b36ce5 JC |
913 | indio_dev->buffer, NULL); |
914 | else | |
a9519456 | 915 | ret = __iio_update_buffers(indio_dev, |
84b36ce5 JC |
916 | NULL, indio_dev->buffer); |
917 | ||
84b36ce5 JC |
918 | done: |
919 | mutex_unlock(&indio_dev->mlock); | |
920 | return (ret < 0) ? ret : len; | |
921 | } | |
84b36ce5 | 922 | |
d967cb6b LPC |
923 | static const char * const iio_scan_elements_group_name = "scan_elements"; |
924 | ||
37d34556 JC |
925 | static ssize_t iio_buffer_show_watermark(struct device *dev, |
926 | struct device_attribute *attr, | |
927 | char *buf) | |
928 | { | |
929 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
930 | struct iio_buffer *buffer = indio_dev->buffer; | |
931 | ||
932 | return sprintf(buf, "%u\n", buffer->watermark); | |
933 | } | |
934 | ||
935 | static ssize_t iio_buffer_store_watermark(struct device *dev, | |
936 | struct device_attribute *attr, | |
937 | const char *buf, | |
938 | size_t len) | |
939 | { | |
940 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
941 | struct iio_buffer *buffer = indio_dev->buffer; | |
942 | unsigned int val; | |
943 | int ret; | |
944 | ||
945 | ret = kstrtouint(buf, 10, &val); | |
946 | if (ret) | |
947 | return ret; | |
948 | if (!val) | |
949 | return -EINVAL; | |
950 | ||
951 | mutex_lock(&indio_dev->mlock); | |
952 | ||
953 | if (val > buffer->length) { | |
954 | ret = -EINVAL; | |
955 | goto out; | |
956 | } | |
957 | ||
958 | if (iio_buffer_is_active(indio_dev->buffer)) { | |
959 | ret = -EBUSY; | |
960 | goto out; | |
961 | } | |
962 | ||
963 | buffer->watermark = val; | |
f4f4673b OP |
964 | |
965 | if (indio_dev->info->hwfifo_set_watermark) | |
966 | indio_dev->info->hwfifo_set_watermark(indio_dev, val); | |
37d34556 JC |
967 | out: |
968 | mutex_unlock(&indio_dev->mlock); | |
969 | ||
970 | return ret ? ret : len; | |
971 | } | |
972 | ||
08e7e0ad LPC |
973 | static DEVICE_ATTR(length, S_IRUGO | S_IWUSR, iio_buffer_read_length, |
974 | iio_buffer_write_length); | |
8d92db28 LPC |
975 | static struct device_attribute dev_attr_length_ro = __ATTR(length, |
976 | S_IRUGO, iio_buffer_read_length, NULL); | |
08e7e0ad LPC |
977 | static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, |
978 | iio_buffer_show_enable, iio_buffer_store_enable); | |
37d34556 JC |
979 | static DEVICE_ATTR(watermark, S_IRUGO | S_IWUSR, |
980 | iio_buffer_show_watermark, iio_buffer_store_watermark); | |
08e7e0ad | 981 | |
6da9b382 OP |
982 | static struct attribute *iio_buffer_attrs[] = { |
983 | &dev_attr_length.attr, | |
984 | &dev_attr_enable.attr, | |
37d34556 | 985 | &dev_attr_watermark.attr, |
6da9b382 OP |
986 | }; |
987 | ||
d967cb6b LPC |
988 | int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev) |
989 | { | |
990 | struct iio_dev_attr *p; | |
991 | struct attribute **attr; | |
992 | struct iio_buffer *buffer = indio_dev->buffer; | |
993 | int ret, i, attrn, attrcount, attrcount_orig = 0; | |
994 | const struct iio_chan_spec *channels; | |
995 | ||
629bc023 LPC |
996 | channels = indio_dev->channels; |
997 | if (channels) { | |
998 | int ml = indio_dev->masklength; | |
999 | ||
1000 | for (i = 0; i < indio_dev->num_channels; i++) | |
1001 | ml = max(ml, channels[i].scan_index + 1); | |
1002 | indio_dev->masklength = ml; | |
1003 | } | |
1004 | ||
d967cb6b LPC |
1005 | if (!buffer) |
1006 | return 0; | |
1007 | ||
08e7e0ad LPC |
1008 | attrcount = 0; |
1009 | if (buffer->attrs) { | |
1010 | while (buffer->attrs[attrcount] != NULL) | |
1011 | attrcount++; | |
1012 | } | |
1013 | ||
6da9b382 OP |
1014 | attr = kcalloc(attrcount + ARRAY_SIZE(iio_buffer_attrs) + 1, |
1015 | sizeof(struct attribute *), GFP_KERNEL); | |
1016 | if (!attr) | |
08e7e0ad LPC |
1017 | return -ENOMEM; |
1018 | ||
6da9b382 OP |
1019 | memcpy(attr, iio_buffer_attrs, sizeof(iio_buffer_attrs)); |
1020 | if (!buffer->access->set_length) | |
1021 | attr[0] = &dev_attr_length_ro.attr; | |
1022 | ||
08e7e0ad | 1023 | if (buffer->attrs) |
6da9b382 OP |
1024 | memcpy(&attr[ARRAY_SIZE(iio_buffer_attrs)], buffer->attrs, |
1025 | sizeof(struct attribute *) * attrcount); | |
1026 | ||
1027 | attr[attrcount + ARRAY_SIZE(iio_buffer_attrs)] = NULL; | |
1028 | ||
1029 | buffer->buffer_group.name = "buffer"; | |
1030 | buffer->buffer_group.attrs = attr; | |
08e7e0ad LPC |
1031 | |
1032 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->buffer_group; | |
1033 | ||
d967cb6b LPC |
1034 | if (buffer->scan_el_attrs != NULL) { |
1035 | attr = buffer->scan_el_attrs->attrs; | |
1036 | while (*attr++ != NULL) | |
1037 | attrcount_orig++; | |
1038 | } | |
1039 | attrcount = attrcount_orig; | |
1040 | INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list); | |
1041 | channels = indio_dev->channels; | |
1042 | if (channels) { | |
1043 | /* new magic */ | |
1044 | for (i = 0; i < indio_dev->num_channels; i++) { | |
1045 | if (channels[i].scan_index < 0) | |
1046 | continue; | |
1047 | ||
d967cb6b LPC |
1048 | ret = iio_buffer_add_channel_sysfs(indio_dev, |
1049 | &channels[i]); | |
1050 | if (ret < 0) | |
1051 | goto error_cleanup_dynamic; | |
1052 | attrcount += ret; | |
1053 | if (channels[i].type == IIO_TIMESTAMP) | |
1054 | indio_dev->scan_index_timestamp = | |
1055 | channels[i].scan_index; | |
1056 | } | |
1057 | if (indio_dev->masklength && buffer->scan_mask == NULL) { | |
1058 | buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), | |
1059 | sizeof(*buffer->scan_mask), | |
1060 | GFP_KERNEL); | |
1061 | if (buffer->scan_mask == NULL) { | |
1062 | ret = -ENOMEM; | |
1063 | goto error_cleanup_dynamic; | |
1064 | } | |
1065 | } | |
1066 | } | |
1067 | ||
1068 | buffer->scan_el_group.name = iio_scan_elements_group_name; | |
1069 | ||
1070 | buffer->scan_el_group.attrs = kcalloc(attrcount + 1, | |
1071 | sizeof(buffer->scan_el_group.attrs[0]), | |
1072 | GFP_KERNEL); | |
1073 | if (buffer->scan_el_group.attrs == NULL) { | |
1074 | ret = -ENOMEM; | |
1075 | goto error_free_scan_mask; | |
1076 | } | |
1077 | if (buffer->scan_el_attrs) | |
1078 | memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs, | |
1079 | sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig); | |
1080 | attrn = attrcount_orig; | |
1081 | ||
1082 | list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l) | |
1083 | buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr; | |
1084 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group; | |
1085 | ||
1086 | return 0; | |
1087 | ||
1088 | error_free_scan_mask: | |
1089 | kfree(buffer->scan_mask); | |
1090 | error_cleanup_dynamic: | |
1091 | iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list); | |
08e7e0ad | 1092 | kfree(indio_dev->buffer->buffer_group.attrs); |
d967cb6b LPC |
1093 | |
1094 | return ret; | |
1095 | } | |
1096 | ||
1097 | void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev) | |
1098 | { | |
1099 | if (!indio_dev->buffer) | |
1100 | return; | |
1101 | ||
1102 | kfree(indio_dev->buffer->scan_mask); | |
08e7e0ad | 1103 | kfree(indio_dev->buffer->buffer_group.attrs); |
d967cb6b LPC |
1104 | kfree(indio_dev->buffer->scan_el_group.attrs); |
1105 | iio_free_chan_devattr_list(&indio_dev->buffer->scan_el_dev_attr_list); | |
1106 | } | |
1107 | ||
81636632 LPC |
1108 | /** |
1109 | * iio_validate_scan_mask_onehot() - Validates that exactly one channel is selected | |
1110 | * @indio_dev: the iio device | |
1111 | * @mask: scan mask to be checked | |
1112 | * | |
1113 | * Return true if exactly one bit is set in the scan mask, false otherwise. It | |
1114 | * can be used for devices where only one channel can be active for sampling at | |
1115 | * a time. | |
1116 | */ | |
1117 | bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev, | |
1118 | const unsigned long *mask) | |
1119 | { | |
1120 | return bitmap_weight(mask, indio_dev->masklength) == 1; | |
1121 | } | |
1122 | EXPORT_SYMBOL_GPL(iio_validate_scan_mask_onehot); | |
1123 | ||
f79a9098 JC |
1124 | int iio_scan_mask_query(struct iio_dev *indio_dev, |
1125 | struct iio_buffer *buffer, int bit) | |
32b5eeca | 1126 | { |
f8c6f4e9 | 1127 | if (bit > indio_dev->masklength) |
32b5eeca JC |
1128 | return -EINVAL; |
1129 | ||
14555b14 | 1130 | if (!buffer->scan_mask) |
32b5eeca | 1131 | return 0; |
32b5eeca | 1132 | |
2076a20f AB |
1133 | /* Ensure return value is 0 or 1. */ |
1134 | return !!test_bit(bit, buffer->scan_mask); | |
32b5eeca JC |
1135 | }; |
1136 | EXPORT_SYMBOL_GPL(iio_scan_mask_query); | |
5ada4ea9 JC |
1137 | |
1138 | /** | |
1139 | * struct iio_demux_table() - table describing demux memcpy ops | |
1140 | * @from: index to copy from | |
99698b45 | 1141 | * @to: index to copy to |
5ada4ea9 JC |
1142 | * @length: how many bytes to copy |
1143 | * @l: list head used for management | |
1144 | */ | |
1145 | struct iio_demux_table { | |
1146 | unsigned from; | |
1147 | unsigned to; | |
1148 | unsigned length; | |
1149 | struct list_head l; | |
1150 | }; | |
1151 | ||
5d65d920 LPC |
1152 | static const void *iio_demux(struct iio_buffer *buffer, |
1153 | const void *datain) | |
5ada4ea9 JC |
1154 | { |
1155 | struct iio_demux_table *t; | |
1156 | ||
1157 | if (list_empty(&buffer->demux_list)) | |
1158 | return datain; | |
1159 | list_for_each_entry(t, &buffer->demux_list, l) | |
1160 | memcpy(buffer->demux_bounce + t->to, | |
1161 | datain + t->from, t->length); | |
1162 | ||
1163 | return buffer->demux_bounce; | |
1164 | } | |
1165 | ||
5d65d920 | 1166 | static int iio_push_to_buffer(struct iio_buffer *buffer, const void *data) |
5ada4ea9 | 1167 | { |
5d65d920 | 1168 | const void *dataout = iio_demux(buffer, data); |
37d34556 JC |
1169 | int ret; |
1170 | ||
1171 | ret = buffer->access->store_to(buffer, dataout); | |
1172 | if (ret) | |
1173 | return ret; | |
5ada4ea9 | 1174 | |
37d34556 JC |
1175 | /* |
1176 | * We can't just test for watermark to decide if we wake the poll queue | |
1177 | * because read may request less samples than the watermark. | |
1178 | */ | |
1179 | wake_up_interruptible_poll(&buffer->pollq, POLLIN | POLLRDNORM); | |
1180 | return 0; | |
5ada4ea9 | 1181 | } |
5ada4ea9 | 1182 | |
842cd100 JC |
1183 | static void iio_buffer_demux_free(struct iio_buffer *buffer) |
1184 | { | |
1185 | struct iio_demux_table *p, *q; | |
1186 | list_for_each_entry_safe(p, q, &buffer->demux_list, l) { | |
1187 | list_del(&p->l); | |
1188 | kfree(p); | |
1189 | } | |
1190 | } | |
1191 | ||
84b36ce5 | 1192 | |
5d65d920 | 1193 | int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data) |
84b36ce5 JC |
1194 | { |
1195 | int ret; | |
1196 | struct iio_buffer *buf; | |
1197 | ||
1198 | list_for_each_entry(buf, &indio_dev->buffer_list, buffer_list) { | |
1199 | ret = iio_push_to_buffer(buf, data); | |
1200 | if (ret < 0) | |
1201 | return ret; | |
1202 | } | |
1203 | ||
1204 | return 0; | |
1205 | } | |
1206 | EXPORT_SYMBOL_GPL(iio_push_to_buffers); | |
1207 | ||
cbe88bcc LPC |
1208 | static int iio_buffer_add_demux(struct iio_buffer *buffer, |
1209 | struct iio_demux_table **p, unsigned int in_loc, unsigned int out_loc, | |
1210 | unsigned int length) | |
1211 | { | |
1212 | ||
1213 | if (*p && (*p)->from + (*p)->length == in_loc && | |
1214 | (*p)->to + (*p)->length == out_loc) { | |
1215 | (*p)->length += length; | |
1216 | } else { | |
7cdca178 | 1217 | *p = kmalloc(sizeof(**p), GFP_KERNEL); |
cbe88bcc LPC |
1218 | if (*p == NULL) |
1219 | return -ENOMEM; | |
1220 | (*p)->from = in_loc; | |
1221 | (*p)->to = out_loc; | |
1222 | (*p)->length = length; | |
1223 | list_add_tail(&(*p)->l, &buffer->demux_list); | |
1224 | } | |
1225 | ||
1226 | return 0; | |
1227 | } | |
1228 | ||
84b36ce5 JC |
1229 | static int iio_buffer_update_demux(struct iio_dev *indio_dev, |
1230 | struct iio_buffer *buffer) | |
5ada4ea9 JC |
1231 | { |
1232 | const struct iio_chan_spec *ch; | |
5ada4ea9 JC |
1233 | int ret, in_ind = -1, out_ind, length; |
1234 | unsigned in_loc = 0, out_loc = 0; | |
cbe88bcc | 1235 | struct iio_demux_table *p = NULL; |
5ada4ea9 JC |
1236 | |
1237 | /* Clear out any old demux */ | |
842cd100 | 1238 | iio_buffer_demux_free(buffer); |
5ada4ea9 JC |
1239 | kfree(buffer->demux_bounce); |
1240 | buffer->demux_bounce = NULL; | |
1241 | ||
1242 | /* First work out which scan mode we will actually have */ | |
1243 | if (bitmap_equal(indio_dev->active_scan_mask, | |
1244 | buffer->scan_mask, | |
1245 | indio_dev->masklength)) | |
1246 | return 0; | |
1247 | ||
1248 | /* Now we have the two masks, work from least sig and build up sizes */ | |
1249 | for_each_set_bit(out_ind, | |
61bd55ce | 1250 | buffer->scan_mask, |
5ada4ea9 JC |
1251 | indio_dev->masklength) { |
1252 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
1253 | indio_dev->masklength, | |
1254 | in_ind + 1); | |
1255 | while (in_ind != out_ind) { | |
1256 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
1257 | indio_dev->masklength, | |
1258 | in_ind + 1); | |
1259 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
0ee8546a SP |
1260 | if (ch->scan_type.repeat > 1) |
1261 | length = ch->scan_type.storagebits / 8 * | |
1262 | ch->scan_type.repeat; | |
1263 | else | |
1264 | length = ch->scan_type.storagebits / 8; | |
5ada4ea9 | 1265 | /* Make sure we are aligned */ |
61072dbc | 1266 | in_loc = roundup(in_loc, length) + length; |
5ada4ea9 JC |
1267 | } |
1268 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
0ee8546a SP |
1269 | if (ch->scan_type.repeat > 1) |
1270 | length = ch->scan_type.storagebits / 8 * | |
1271 | ch->scan_type.repeat; | |
1272 | else | |
1273 | length = ch->scan_type.storagebits / 8; | |
61072dbc LPC |
1274 | out_loc = roundup(out_loc, length); |
1275 | in_loc = roundup(in_loc, length); | |
cbe88bcc LPC |
1276 | ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length); |
1277 | if (ret) | |
1278 | goto error_clear_mux_table; | |
5ada4ea9 JC |
1279 | out_loc += length; |
1280 | in_loc += length; | |
1281 | } | |
1282 | /* Relies on scan_timestamp being last */ | |
1283 | if (buffer->scan_timestamp) { | |
5ada4ea9 | 1284 | ch = iio_find_channel_from_si(indio_dev, |
f1264809 | 1285 | indio_dev->scan_index_timestamp); |
0ee8546a SP |
1286 | if (ch->scan_type.repeat > 1) |
1287 | length = ch->scan_type.storagebits / 8 * | |
1288 | ch->scan_type.repeat; | |
1289 | else | |
1290 | length = ch->scan_type.storagebits / 8; | |
61072dbc LPC |
1291 | out_loc = roundup(out_loc, length); |
1292 | in_loc = roundup(in_loc, length); | |
cbe88bcc LPC |
1293 | ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length); |
1294 | if (ret) | |
1295 | goto error_clear_mux_table; | |
5ada4ea9 JC |
1296 | out_loc += length; |
1297 | in_loc += length; | |
1298 | } | |
1299 | buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL); | |
1300 | if (buffer->demux_bounce == NULL) { | |
1301 | ret = -ENOMEM; | |
1302 | goto error_clear_mux_table; | |
1303 | } | |
1304 | return 0; | |
1305 | ||
1306 | error_clear_mux_table: | |
842cd100 JC |
1307 | iio_buffer_demux_free(buffer); |
1308 | ||
5ada4ea9 JC |
1309 | return ret; |
1310 | } | |
84b36ce5 JC |
1311 | |
1312 | int iio_update_demux(struct iio_dev *indio_dev) | |
1313 | { | |
1314 | struct iio_buffer *buffer; | |
1315 | int ret; | |
1316 | ||
1317 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { | |
1318 | ret = iio_buffer_update_demux(indio_dev, buffer); | |
1319 | if (ret < 0) | |
1320 | goto error_clear_mux_table; | |
1321 | } | |
1322 | return 0; | |
1323 | ||
1324 | error_clear_mux_table: | |
1325 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) | |
1326 | iio_buffer_demux_free(buffer); | |
1327 | ||
1328 | return ret; | |
1329 | } | |
5ada4ea9 | 1330 | EXPORT_SYMBOL_GPL(iio_update_demux); |
9e69c935 LPC |
1331 | |
1332 | /** | |
1333 | * iio_buffer_release() - Free a buffer's resources | |
1334 | * @ref: Pointer to the kref embedded in the iio_buffer struct | |
1335 | * | |
1336 | * This function is called when the last reference to the buffer has been | |
1337 | * dropped. It will typically free all resources allocated by the buffer. Do not | |
1338 | * call this function manually, always use iio_buffer_put() when done using a | |
1339 | * buffer. | |
1340 | */ | |
1341 | static void iio_buffer_release(struct kref *ref) | |
1342 | { | |
1343 | struct iio_buffer *buffer = container_of(ref, struct iio_buffer, ref); | |
1344 | ||
1345 | buffer->access->release(buffer); | |
1346 | } | |
1347 | ||
1348 | /** | |
1349 | * iio_buffer_get() - Grab a reference to the buffer | |
1350 | * @buffer: The buffer to grab a reference for, may be NULL | |
1351 | * | |
1352 | * Returns the pointer to the buffer that was passed into the function. | |
1353 | */ | |
1354 | struct iio_buffer *iio_buffer_get(struct iio_buffer *buffer) | |
1355 | { | |
1356 | if (buffer) | |
1357 | kref_get(&buffer->ref); | |
1358 | ||
1359 | return buffer; | |
1360 | } | |
1361 | EXPORT_SYMBOL_GPL(iio_buffer_get); | |
1362 | ||
1363 | /** | |
1364 | * iio_buffer_put() - Release the reference to the buffer | |
1365 | * @buffer: The buffer to release the reference for, may be NULL | |
1366 | */ | |
1367 | void iio_buffer_put(struct iio_buffer *buffer) | |
1368 | { | |
1369 | if (buffer) | |
1370 | kref_put(&buffer->ref, iio_buffer_release); | |
1371 | } | |
1372 | EXPORT_SYMBOL_GPL(iio_buffer_put); |