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Commit | Line | Data |
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7026ea4b JC |
1 | /* The industrial I/O core |
2 | * | |
3 | * Copyright (c) 2008 Jonathan Cameron | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | * | |
14555b14 | 9 | * Handling of buffer allocation / resizing. |
7026ea4b JC |
10 | * |
11 | * | |
12 | * Things to look at here. | |
13 | * - Better memory allocation techniques? | |
14 | * - Alternative access techniques? | |
15 | */ | |
16 | #include <linux/kernel.h> | |
8e336a72 | 17 | #include <linux/export.h> |
7026ea4b | 18 | #include <linux/device.h> |
7026ea4b | 19 | #include <linux/fs.h> |
7026ea4b | 20 | #include <linux/cdev.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
a7348347 | 22 | #include <linux/poll.h> |
d2f0a48f | 23 | #include <linux/sched.h> |
7026ea4b | 24 | |
06458e27 | 25 | #include <linux/iio/iio.h> |
df9c1c42 | 26 | #include "iio_core.h" |
06458e27 JC |
27 | #include <linux/iio/sysfs.h> |
28 | #include <linux/iio/buffer.h> | |
7026ea4b | 29 | |
8310b86c JC |
30 | static const char * const iio_endian_prefix[] = { |
31 | [IIO_BE] = "be", | |
32 | [IIO_LE] = "le", | |
33 | }; | |
7026ea4b | 34 | |
705ee2c9 | 35 | static bool iio_buffer_is_active(struct iio_buffer *buf) |
84b36ce5 | 36 | { |
705ee2c9 | 37 | return !list_empty(&buf->buffer_list); |
84b36ce5 JC |
38 | } |
39 | ||
647cc7b9 LPC |
40 | static bool iio_buffer_data_available(struct iio_buffer *buf) |
41 | { | |
42 | if (buf->access->data_available) | |
43 | return buf->access->data_available(buf); | |
44 | ||
45 | return buf->stufftoread; | |
46 | } | |
47 | ||
7026ea4b | 48 | /** |
14555b14 | 49 | * iio_buffer_read_first_n_outer() - chrdev read for buffer access |
7026ea4b | 50 | * |
14555b14 JC |
51 | * This function relies on all buffer implementations having an |
52 | * iio_buffer as their first element. | |
7026ea4b | 53 | **/ |
14555b14 JC |
54 | ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf, |
55 | size_t n, loff_t *f_ps) | |
7026ea4b | 56 | { |
1aa04278 | 57 | struct iio_dev *indio_dev = filp->private_data; |
14555b14 | 58 | struct iio_buffer *rb = indio_dev->buffer; |
ee551a10 | 59 | int ret; |
d5857d65 | 60 | |
f18e7a06 LPC |
61 | if (!indio_dev->info) |
62 | return -ENODEV; | |
63 | ||
96e00f11 | 64 | if (!rb || !rb->access->read_first_n) |
7026ea4b | 65 | return -EINVAL; |
ee551a10 LPC |
66 | |
67 | do { | |
68 | if (!iio_buffer_data_available(rb)) { | |
69 | if (filp->f_flags & O_NONBLOCK) | |
70 | return -EAGAIN; | |
71 | ||
72 | ret = wait_event_interruptible(rb->pollq, | |
73 | iio_buffer_data_available(rb) || | |
74 | indio_dev->info == NULL); | |
75 | if (ret) | |
76 | return ret; | |
77 | if (indio_dev->info == NULL) | |
78 | return -ENODEV; | |
79 | } | |
80 | ||
81 | ret = rb->access->read_first_n(rb, n, buf); | |
82 | if (ret == 0 && (filp->f_flags & O_NONBLOCK)) | |
83 | ret = -EAGAIN; | |
84 | } while (ret == 0); | |
85 | ||
86 | return ret; | |
7026ea4b JC |
87 | } |
88 | ||
a7348347 | 89 | /** |
14555b14 | 90 | * iio_buffer_poll() - poll the buffer to find out if it has data |
a7348347 | 91 | */ |
14555b14 JC |
92 | unsigned int iio_buffer_poll(struct file *filp, |
93 | struct poll_table_struct *wait) | |
a7348347 | 94 | { |
1aa04278 | 95 | struct iio_dev *indio_dev = filp->private_data; |
14555b14 | 96 | struct iio_buffer *rb = indio_dev->buffer; |
a7348347 | 97 | |
f18e7a06 LPC |
98 | if (!indio_dev->info) |
99 | return -ENODEV; | |
100 | ||
a7348347 | 101 | poll_wait(filp, &rb->pollq, wait); |
647cc7b9 | 102 | if (iio_buffer_data_available(rb)) |
a7348347 JC |
103 | return POLLIN | POLLRDNORM; |
104 | /* need a way of knowing if there may be enough data... */ | |
8d213f24 | 105 | return 0; |
a7348347 JC |
106 | } |
107 | ||
d2f0a48f LPC |
108 | /** |
109 | * iio_buffer_wakeup_poll - Wakes up the buffer waitqueue | |
110 | * @indio_dev: The IIO device | |
111 | * | |
112 | * Wakes up the event waitqueue used for poll(). Should usually | |
113 | * be called when the device is unregistered. | |
114 | */ | |
115 | void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) | |
116 | { | |
117 | if (!indio_dev->buffer) | |
118 | return; | |
119 | ||
120 | wake_up(&indio_dev->buffer->pollq); | |
121 | } | |
122 | ||
f79a9098 | 123 | void iio_buffer_init(struct iio_buffer *buffer) |
7026ea4b | 124 | { |
5ada4ea9 | 125 | INIT_LIST_HEAD(&buffer->demux_list); |
705ee2c9 | 126 | INIT_LIST_HEAD(&buffer->buffer_list); |
14555b14 | 127 | init_waitqueue_head(&buffer->pollq); |
9e69c935 | 128 | kref_init(&buffer->ref); |
7026ea4b | 129 | } |
14555b14 | 130 | EXPORT_SYMBOL(iio_buffer_init); |
7026ea4b | 131 | |
1d892719 | 132 | static ssize_t iio_show_scan_index(struct device *dev, |
8d213f24 JC |
133 | struct device_attribute *attr, |
134 | char *buf) | |
1d892719 | 135 | { |
8d213f24 | 136 | return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index); |
1d892719 JC |
137 | } |
138 | ||
139 | static ssize_t iio_show_fixed_type(struct device *dev, | |
140 | struct device_attribute *attr, | |
141 | char *buf) | |
142 | { | |
143 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
8310b86c JC |
144 | u8 type = this_attr->c->scan_type.endianness; |
145 | ||
146 | if (type == IIO_CPU) { | |
9d5d1153 JC |
147 | #ifdef __LITTLE_ENDIAN |
148 | type = IIO_LE; | |
149 | #else | |
150 | type = IIO_BE; | |
151 | #endif | |
8310b86c | 152 | } |
0ee8546a SP |
153 | if (this_attr->c->scan_type.repeat > 1) |
154 | return sprintf(buf, "%s:%c%d/%dX%d>>%u\n", | |
155 | iio_endian_prefix[type], | |
156 | this_attr->c->scan_type.sign, | |
157 | this_attr->c->scan_type.realbits, | |
158 | this_attr->c->scan_type.storagebits, | |
159 | this_attr->c->scan_type.repeat, | |
160 | this_attr->c->scan_type.shift); | |
161 | else | |
162 | return sprintf(buf, "%s:%c%d/%d>>%u\n", | |
8310b86c | 163 | iio_endian_prefix[type], |
1d892719 JC |
164 | this_attr->c->scan_type.sign, |
165 | this_attr->c->scan_type.realbits, | |
166 | this_attr->c->scan_type.storagebits, | |
167 | this_attr->c->scan_type.shift); | |
168 | } | |
169 | ||
8d213f24 JC |
170 | static ssize_t iio_scan_el_show(struct device *dev, |
171 | struct device_attribute *attr, | |
172 | char *buf) | |
173 | { | |
174 | int ret; | |
e53f5ac5 | 175 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
8d213f24 | 176 | |
2076a20f AB |
177 | /* Ensure ret is 0 or 1. */ |
178 | ret = !!test_bit(to_iio_dev_attr(attr)->address, | |
5ada4ea9 JC |
179 | indio_dev->buffer->scan_mask); |
180 | ||
8d213f24 JC |
181 | return sprintf(buf, "%d\n", ret); |
182 | } | |
183 | ||
14555b14 | 184 | static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit) |
8d213f24 | 185 | { |
14555b14 | 186 | clear_bit(bit, buffer->scan_mask); |
8d213f24 JC |
187 | return 0; |
188 | } | |
189 | ||
190 | static ssize_t iio_scan_el_store(struct device *dev, | |
191 | struct device_attribute *attr, | |
192 | const char *buf, | |
193 | size_t len) | |
194 | { | |
a714af27 | 195 | int ret; |
8d213f24 | 196 | bool state; |
e53f5ac5 | 197 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 198 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 JC |
199 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
200 | ||
a714af27 JC |
201 | ret = strtobool(buf, &state); |
202 | if (ret < 0) | |
203 | return ret; | |
8d213f24 | 204 | mutex_lock(&indio_dev->mlock); |
705ee2c9 | 205 | if (iio_buffer_is_active(indio_dev->buffer)) { |
8d213f24 JC |
206 | ret = -EBUSY; |
207 | goto error_ret; | |
208 | } | |
f79a9098 | 209 | ret = iio_scan_mask_query(indio_dev, buffer, this_attr->address); |
8d213f24 JC |
210 | if (ret < 0) |
211 | goto error_ret; | |
212 | if (!state && ret) { | |
14555b14 | 213 | ret = iio_scan_mask_clear(buffer, this_attr->address); |
8d213f24 JC |
214 | if (ret) |
215 | goto error_ret; | |
216 | } else if (state && !ret) { | |
f79a9098 | 217 | ret = iio_scan_mask_set(indio_dev, buffer, this_attr->address); |
8d213f24 JC |
218 | if (ret) |
219 | goto error_ret; | |
220 | } | |
221 | ||
222 | error_ret: | |
223 | mutex_unlock(&indio_dev->mlock); | |
224 | ||
5a2a6e11 | 225 | return ret < 0 ? ret : len; |
8d213f24 JC |
226 | |
227 | } | |
228 | ||
229 | static ssize_t iio_scan_el_ts_show(struct device *dev, | |
230 | struct device_attribute *attr, | |
231 | char *buf) | |
232 | { | |
e53f5ac5 | 233 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
f8c6f4e9 | 234 | return sprintf(buf, "%d\n", indio_dev->buffer->scan_timestamp); |
8d213f24 JC |
235 | } |
236 | ||
237 | static ssize_t iio_scan_el_ts_store(struct device *dev, | |
238 | struct device_attribute *attr, | |
239 | const char *buf, | |
240 | size_t len) | |
241 | { | |
a714af27 | 242 | int ret; |
e53f5ac5 | 243 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
8d213f24 | 244 | bool state; |
1aa04278 | 245 | |
a714af27 JC |
246 | ret = strtobool(buf, &state); |
247 | if (ret < 0) | |
248 | return ret; | |
249 | ||
8d213f24 | 250 | mutex_lock(&indio_dev->mlock); |
705ee2c9 | 251 | if (iio_buffer_is_active(indio_dev->buffer)) { |
8d213f24 JC |
252 | ret = -EBUSY; |
253 | goto error_ret; | |
254 | } | |
14555b14 | 255 | indio_dev->buffer->scan_timestamp = state; |
8d213f24 JC |
256 | error_ret: |
257 | mutex_unlock(&indio_dev->mlock); | |
258 | ||
259 | return ret ? ret : len; | |
260 | } | |
261 | ||
14555b14 JC |
262 | static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev, |
263 | const struct iio_chan_spec *chan) | |
1d892719 | 264 | { |
26d25ae3 | 265 | int ret, attrcount = 0; |
14555b14 | 266 | struct iio_buffer *buffer = indio_dev->buffer; |
1d892719 | 267 | |
26d25ae3 | 268 | ret = __iio_add_chan_devattr("index", |
1d892719 JC |
269 | chan, |
270 | &iio_show_scan_index, | |
271 | NULL, | |
272 | 0, | |
3704432f | 273 | IIO_SEPARATE, |
1aa04278 | 274 | &indio_dev->dev, |
14555b14 | 275 | &buffer->scan_el_dev_attr_list); |
1d892719 | 276 | if (ret) |
92825ff9 | 277 | return ret; |
26d25ae3 JC |
278 | attrcount++; |
279 | ret = __iio_add_chan_devattr("type", | |
1d892719 JC |
280 | chan, |
281 | &iio_show_fixed_type, | |
282 | NULL, | |
283 | 0, | |
284 | 0, | |
1aa04278 | 285 | &indio_dev->dev, |
14555b14 | 286 | &buffer->scan_el_dev_attr_list); |
1d892719 | 287 | if (ret) |
92825ff9 | 288 | return ret; |
26d25ae3 | 289 | attrcount++; |
a88b3ebc | 290 | if (chan->type != IIO_TIMESTAMP) |
26d25ae3 | 291 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
292 | chan, |
293 | &iio_scan_el_show, | |
294 | &iio_scan_el_store, | |
295 | chan->scan_index, | |
296 | 0, | |
1aa04278 | 297 | &indio_dev->dev, |
14555b14 | 298 | &buffer->scan_el_dev_attr_list); |
a88b3ebc | 299 | else |
26d25ae3 | 300 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
301 | chan, |
302 | &iio_scan_el_ts_show, | |
303 | &iio_scan_el_ts_store, | |
304 | chan->scan_index, | |
305 | 0, | |
1aa04278 | 306 | &indio_dev->dev, |
14555b14 | 307 | &buffer->scan_el_dev_attr_list); |
9572588c | 308 | if (ret) |
92825ff9 | 309 | return ret; |
26d25ae3 JC |
310 | attrcount++; |
311 | ret = attrcount; | |
1d892719 JC |
312 | return ret; |
313 | } | |
314 | ||
26d25ae3 JC |
315 | static const char * const iio_scan_elements_group_name = "scan_elements"; |
316 | ||
14555b14 JC |
317 | int iio_buffer_register(struct iio_dev *indio_dev, |
318 | const struct iio_chan_spec *channels, | |
319 | int num_channels) | |
1d892719 | 320 | { |
26d25ae3 JC |
321 | struct iio_dev_attr *p; |
322 | struct attribute **attr; | |
14555b14 | 323 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 JC |
324 | int ret, i, attrn, attrcount, attrcount_orig = 0; |
325 | ||
14555b14 JC |
326 | if (buffer->attrs) |
327 | indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs; | |
bf32963c | 328 | |
14555b14 JC |
329 | if (buffer->scan_el_attrs != NULL) { |
330 | attr = buffer->scan_el_attrs->attrs; | |
26d25ae3 JC |
331 | while (*attr++ != NULL) |
332 | attrcount_orig++; | |
333 | } | |
334 | attrcount = attrcount_orig; | |
14555b14 | 335 | INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list); |
1d892719 JC |
336 | if (channels) { |
337 | /* new magic */ | |
338 | for (i = 0; i < num_channels; i++) { | |
f5b81ddd LPC |
339 | if (channels[i].scan_index < 0) |
340 | continue; | |
341 | ||
32b5eeca JC |
342 | /* Establish necessary mask length */ |
343 | if (channels[i].scan_index > | |
344 | (int)indio_dev->masklength - 1) | |
345 | indio_dev->masklength | |
e1dc7bee | 346 | = channels[i].scan_index + 1; |
32b5eeca | 347 | |
14555b14 | 348 | ret = iio_buffer_add_channel_sysfs(indio_dev, |
1aa04278 | 349 | &channels[i]); |
1d892719 | 350 | if (ret < 0) |
26d25ae3 JC |
351 | goto error_cleanup_dynamic; |
352 | attrcount += ret; | |
beb80600 | 353 | if (channels[i].type == IIO_TIMESTAMP) |
f1264809 | 354 | indio_dev->scan_index_timestamp = |
beb80600 | 355 | channels[i].scan_index; |
1d892719 | 356 | } |
14555b14 | 357 | if (indio_dev->masklength && buffer->scan_mask == NULL) { |
d83fb184 TM |
358 | buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), |
359 | sizeof(*buffer->scan_mask), | |
360 | GFP_KERNEL); | |
14555b14 | 361 | if (buffer->scan_mask == NULL) { |
32b5eeca | 362 | ret = -ENOMEM; |
26d25ae3 | 363 | goto error_cleanup_dynamic; |
32b5eeca JC |
364 | } |
365 | } | |
1d892719 JC |
366 | } |
367 | ||
14555b14 | 368 | buffer->scan_el_group.name = iio_scan_elements_group_name; |
26d25ae3 | 369 | |
d83fb184 TM |
370 | buffer->scan_el_group.attrs = kcalloc(attrcount + 1, |
371 | sizeof(buffer->scan_el_group.attrs[0]), | |
372 | GFP_KERNEL); | |
14555b14 | 373 | if (buffer->scan_el_group.attrs == NULL) { |
26d25ae3 JC |
374 | ret = -ENOMEM; |
375 | goto error_free_scan_mask; | |
376 | } | |
14555b14 JC |
377 | if (buffer->scan_el_attrs) |
378 | memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs, | |
379 | sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig); | |
26d25ae3 JC |
380 | attrn = attrcount_orig; |
381 | ||
14555b14 JC |
382 | list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l) |
383 | buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr; | |
384 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group; | |
26d25ae3 | 385 | |
1d892719 | 386 | return 0; |
26d25ae3 JC |
387 | |
388 | error_free_scan_mask: | |
14555b14 | 389 | kfree(buffer->scan_mask); |
1d892719 | 390 | error_cleanup_dynamic: |
84088ebd | 391 | iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list); |
26d25ae3 | 392 | |
7026ea4b JC |
393 | return ret; |
394 | } | |
14555b14 | 395 | EXPORT_SYMBOL(iio_buffer_register); |
1d892719 | 396 | |
14555b14 | 397 | void iio_buffer_unregister(struct iio_dev *indio_dev) |
7026ea4b | 398 | { |
14555b14 JC |
399 | kfree(indio_dev->buffer->scan_mask); |
400 | kfree(indio_dev->buffer->scan_el_group.attrs); | |
84088ebd | 401 | iio_free_chan_devattr_list(&indio_dev->buffer->scan_el_dev_attr_list); |
7026ea4b | 402 | } |
14555b14 | 403 | EXPORT_SYMBOL(iio_buffer_unregister); |
7026ea4b | 404 | |
14555b14 JC |
405 | ssize_t iio_buffer_read_length(struct device *dev, |
406 | struct device_attribute *attr, | |
407 | char *buf) | |
7026ea4b | 408 | { |
e53f5ac5 | 409 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 410 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 411 | |
14555b14 | 412 | if (buffer->access->get_length) |
8d213f24 | 413 | return sprintf(buf, "%d\n", |
14555b14 | 414 | buffer->access->get_length(buffer)); |
7026ea4b | 415 | |
8d213f24 | 416 | return 0; |
7026ea4b | 417 | } |
14555b14 | 418 | EXPORT_SYMBOL(iio_buffer_read_length); |
7026ea4b | 419 | |
14555b14 JC |
420 | ssize_t iio_buffer_write_length(struct device *dev, |
421 | struct device_attribute *attr, | |
422 | const char *buf, | |
423 | size_t len) | |
7026ea4b | 424 | { |
e53f5ac5 | 425 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 426 | struct iio_buffer *buffer = indio_dev->buffer; |
948ad205 LPC |
427 | unsigned int val; |
428 | int ret; | |
8d213f24 | 429 | |
948ad205 | 430 | ret = kstrtouint(buf, 10, &val); |
7026ea4b JC |
431 | if (ret) |
432 | return ret; | |
433 | ||
14555b14 JC |
434 | if (buffer->access->get_length) |
435 | if (val == buffer->access->get_length(buffer)) | |
7026ea4b JC |
436 | return len; |
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 { | |
869871b5 | 442 | if (buffer->access->set_length) |
e38c79e0 | 443 | buffer->access->set_length(buffer, val); |
e38c79e0 | 444 | ret = 0; |
7026ea4b | 445 | } |
e38c79e0 | 446 | mutex_unlock(&indio_dev->mlock); |
7026ea4b | 447 | |
e38c79e0 | 448 | return ret ? ret : len; |
7026ea4b | 449 | } |
14555b14 | 450 | EXPORT_SYMBOL(iio_buffer_write_length); |
7026ea4b | 451 | |
14555b14 JC |
452 | ssize_t iio_buffer_show_enable(struct device *dev, |
453 | struct device_attribute *attr, | |
454 | char *buf) | |
7026ea4b | 455 | { |
e53f5ac5 | 456 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
705ee2c9 | 457 | return sprintf(buf, "%d\n", iio_buffer_is_active(indio_dev->buffer)); |
7026ea4b | 458 | } |
14555b14 | 459 | EXPORT_SYMBOL(iio_buffer_show_enable); |
7026ea4b | 460 | |
9572588c | 461 | /* Note NULL used as error indicator as it doesn't make sense. */ |
cd4361c7 | 462 | static const unsigned long *iio_scan_mask_match(const unsigned long *av_masks, |
32b5eeca | 463 | unsigned int masklength, |
cd4361c7 | 464 | const unsigned long *mask) |
32b5eeca JC |
465 | { |
466 | if (bitmap_empty(mask, masklength)) | |
467 | return NULL; | |
468 | while (*av_masks) { | |
469 | if (bitmap_subset(mask, av_masks, masklength)) | |
470 | return av_masks; | |
471 | av_masks += BITS_TO_LONGS(masklength); | |
472 | } | |
473 | return NULL; | |
474 | } | |
475 | ||
183f4173 PM |
476 | static int iio_compute_scan_bytes(struct iio_dev *indio_dev, |
477 | const unsigned long *mask, bool timestamp) | |
959d2952 | 478 | { |
959d2952 JC |
479 | const struct iio_chan_spec *ch; |
480 | unsigned bytes = 0; | |
481 | int length, i; | |
959d2952 JC |
482 | |
483 | /* How much space will the demuxed element take? */ | |
6b3b58ed | 484 | for_each_set_bit(i, mask, |
959d2952 JC |
485 | indio_dev->masklength) { |
486 | ch = iio_find_channel_from_si(indio_dev, i); | |
0ee8546a SP |
487 | if (ch->scan_type.repeat > 1) |
488 | length = ch->scan_type.storagebits / 8 * | |
489 | ch->scan_type.repeat; | |
490 | else | |
491 | length = ch->scan_type.storagebits / 8; | |
959d2952 JC |
492 | bytes = ALIGN(bytes, length); |
493 | bytes += length; | |
494 | } | |
6b3b58ed | 495 | if (timestamp) { |
959d2952 | 496 | ch = iio_find_channel_from_si(indio_dev, |
f1264809 | 497 | indio_dev->scan_index_timestamp); |
0ee8546a SP |
498 | if (ch->scan_type.repeat > 1) |
499 | length = ch->scan_type.storagebits / 8 * | |
500 | ch->scan_type.repeat; | |
501 | else | |
502 | length = ch->scan_type.storagebits / 8; | |
959d2952 JC |
503 | bytes = ALIGN(bytes, length); |
504 | bytes += length; | |
505 | } | |
6b3b58ed JC |
506 | return bytes; |
507 | } | |
508 | ||
9e69c935 LPC |
509 | static void iio_buffer_activate(struct iio_dev *indio_dev, |
510 | struct iio_buffer *buffer) | |
511 | { | |
512 | iio_buffer_get(buffer); | |
513 | list_add(&buffer->buffer_list, &indio_dev->buffer_list); | |
514 | } | |
515 | ||
516 | static void iio_buffer_deactivate(struct iio_buffer *buffer) | |
517 | { | |
518 | list_del_init(&buffer->buffer_list); | |
519 | iio_buffer_put(buffer); | |
520 | } | |
521 | ||
a87c82e4 LPC |
522 | void iio_disable_all_buffers(struct iio_dev *indio_dev) |
523 | { | |
524 | struct iio_buffer *buffer, *_buffer; | |
525 | ||
526 | if (list_empty(&indio_dev->buffer_list)) | |
527 | return; | |
528 | ||
529 | if (indio_dev->setup_ops->predisable) | |
530 | indio_dev->setup_ops->predisable(indio_dev); | |
531 | ||
532 | list_for_each_entry_safe(buffer, _buffer, | |
533 | &indio_dev->buffer_list, buffer_list) | |
9e69c935 | 534 | iio_buffer_deactivate(buffer); |
a87c82e4 LPC |
535 | |
536 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
537 | if (indio_dev->setup_ops->postdisable) | |
538 | indio_dev->setup_ops->postdisable(indio_dev); | |
e086ed76 LPC |
539 | |
540 | if (indio_dev->available_scan_masks == NULL) | |
541 | kfree(indio_dev->active_scan_mask); | |
a87c82e4 LPC |
542 | } |
543 | ||
8e050996 LPC |
544 | static void iio_buffer_update_bytes_per_datum(struct iio_dev *indio_dev, |
545 | struct iio_buffer *buffer) | |
546 | { | |
547 | unsigned int bytes; | |
548 | ||
549 | if (!buffer->access->set_bytes_per_datum) | |
550 | return; | |
551 | ||
552 | bytes = iio_compute_scan_bytes(indio_dev, buffer->scan_mask, | |
553 | buffer->scan_timestamp); | |
554 | ||
555 | buffer->access->set_bytes_per_datum(buffer, bytes); | |
556 | } | |
557 | ||
a9519456 | 558 | static int __iio_update_buffers(struct iio_dev *indio_dev, |
84b36ce5 JC |
559 | struct iio_buffer *insert_buffer, |
560 | struct iio_buffer *remove_buffer) | |
6b3b58ed | 561 | { |
84b36ce5 JC |
562 | int ret; |
563 | int success = 0; | |
564 | struct iio_buffer *buffer; | |
565 | unsigned long *compound_mask; | |
566 | const unsigned long *old_mask; | |
6b3b58ed | 567 | |
84b36ce5 JC |
568 | /* Wind down existing buffers - iff there are any */ |
569 | if (!list_empty(&indio_dev->buffer_list)) { | |
570 | if (indio_dev->setup_ops->predisable) { | |
571 | ret = indio_dev->setup_ops->predisable(indio_dev); | |
572 | if (ret) | |
92825ff9 | 573 | return ret; |
84b36ce5 JC |
574 | } |
575 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
576 | if (indio_dev->setup_ops->postdisable) { | |
577 | ret = indio_dev->setup_ops->postdisable(indio_dev); | |
578 | if (ret) | |
92825ff9 | 579 | return ret; |
84b36ce5 JC |
580 | } |
581 | } | |
582 | /* Keep a copy of current setup to allow roll back */ | |
583 | old_mask = indio_dev->active_scan_mask; | |
584 | if (!indio_dev->available_scan_masks) | |
585 | indio_dev->active_scan_mask = NULL; | |
586 | ||
587 | if (remove_buffer) | |
9e69c935 | 588 | iio_buffer_deactivate(remove_buffer); |
84b36ce5 | 589 | if (insert_buffer) |
9e69c935 | 590 | iio_buffer_activate(indio_dev, insert_buffer); |
84b36ce5 JC |
591 | |
592 | /* If no buffers in list, we are done */ | |
593 | if (list_empty(&indio_dev->buffer_list)) { | |
594 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
595 | if (indio_dev->available_scan_masks == NULL) | |
596 | kfree(old_mask); | |
597 | return 0; | |
598 | } | |
959d2952 | 599 | |
9572588c | 600 | /* What scan mask do we actually have? */ |
84b36ce5 JC |
601 | compound_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), |
602 | sizeof(long), GFP_KERNEL); | |
603 | if (compound_mask == NULL) { | |
604 | if (indio_dev->available_scan_masks == NULL) | |
605 | kfree(old_mask); | |
606 | return -ENOMEM; | |
607 | } | |
608 | indio_dev->scan_timestamp = 0; | |
609 | ||
610 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { | |
611 | bitmap_or(compound_mask, compound_mask, buffer->scan_mask, | |
612 | indio_dev->masklength); | |
613 | indio_dev->scan_timestamp |= buffer->scan_timestamp; | |
614 | } | |
615 | if (indio_dev->available_scan_masks) { | |
959d2952 JC |
616 | indio_dev->active_scan_mask = |
617 | iio_scan_mask_match(indio_dev->available_scan_masks, | |
618 | indio_dev->masklength, | |
84b36ce5 JC |
619 | compound_mask); |
620 | if (indio_dev->active_scan_mask == NULL) { | |
621 | /* | |
622 | * Roll back. | |
623 | * Note can only occur when adding a buffer. | |
624 | */ | |
9e69c935 | 625 | iio_buffer_deactivate(insert_buffer); |
d66e0452 PM |
626 | if (old_mask) { |
627 | indio_dev->active_scan_mask = old_mask; | |
628 | success = -EINVAL; | |
629 | } | |
630 | else { | |
631 | kfree(compound_mask); | |
632 | ret = -EINVAL; | |
92825ff9 | 633 | return ret; |
d66e0452 | 634 | } |
84b36ce5 JC |
635 | } |
636 | } else { | |
637 | indio_dev->active_scan_mask = compound_mask; | |
638 | } | |
aff1eb4e | 639 | |
5ada4ea9 JC |
640 | iio_update_demux(indio_dev); |
641 | ||
84b36ce5 JC |
642 | /* Wind up again */ |
643 | if (indio_dev->setup_ops->preenable) { | |
644 | ret = indio_dev->setup_ops->preenable(indio_dev); | |
645 | if (ret) { | |
646 | printk(KERN_ERR | |
bec1889d | 647 | "Buffer not started: buffer preenable failed (%d)\n", ret); |
84b36ce5 JC |
648 | goto error_remove_inserted; |
649 | } | |
650 | } | |
651 | indio_dev->scan_bytes = | |
652 | iio_compute_scan_bytes(indio_dev, | |
653 | indio_dev->active_scan_mask, | |
654 | indio_dev->scan_timestamp); | |
8e050996 LPC |
655 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { |
656 | iio_buffer_update_bytes_per_datum(indio_dev, buffer); | |
84b36ce5 JC |
657 | if (buffer->access->request_update) { |
658 | ret = buffer->access->request_update(buffer); | |
659 | if (ret) { | |
660 | printk(KERN_INFO | |
bec1889d | 661 | "Buffer not started: buffer parameter update failed (%d)\n", ret); |
84b36ce5 JC |
662 | goto error_run_postdisable; |
663 | } | |
664 | } | |
8e050996 | 665 | } |
84b36ce5 JC |
666 | if (indio_dev->info->update_scan_mode) { |
667 | ret = indio_dev->info | |
5ada4ea9 JC |
668 | ->update_scan_mode(indio_dev, |
669 | indio_dev->active_scan_mask); | |
84b36ce5 | 670 | if (ret < 0) { |
bec1889d | 671 | printk(KERN_INFO "Buffer not started: update scan mode failed (%d)\n", ret); |
84b36ce5 JC |
672 | goto error_run_postdisable; |
673 | } | |
674 | } | |
9572588c | 675 | /* Definitely possible for devices to support both of these. */ |
84b36ce5 JC |
676 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) { |
677 | if (!indio_dev->trig) { | |
678 | printk(KERN_INFO "Buffer not started: no trigger\n"); | |
679 | ret = -EINVAL; | |
680 | /* Can only occur on first buffer */ | |
681 | goto error_run_postdisable; | |
682 | } | |
683 | indio_dev->currentmode = INDIO_BUFFER_TRIGGERED; | |
684 | } else if (indio_dev->modes & INDIO_BUFFER_HARDWARE) { | |
685 | indio_dev->currentmode = INDIO_BUFFER_HARDWARE; | |
9572588c | 686 | } else { /* Should never be reached */ |
84b36ce5 JC |
687 | ret = -EINVAL; |
688 | goto error_run_postdisable; | |
689 | } | |
690 | ||
691 | if (indio_dev->setup_ops->postenable) { | |
692 | ret = indio_dev->setup_ops->postenable(indio_dev); | |
693 | if (ret) { | |
694 | printk(KERN_INFO | |
bec1889d | 695 | "Buffer not started: postenable failed (%d)\n", ret); |
84b36ce5 JC |
696 | indio_dev->currentmode = INDIO_DIRECT_MODE; |
697 | if (indio_dev->setup_ops->postdisable) | |
698 | indio_dev->setup_ops->postdisable(indio_dev); | |
699 | goto error_disable_all_buffers; | |
700 | } | |
701 | } | |
702 | ||
703 | if (indio_dev->available_scan_masks) | |
704 | kfree(compound_mask); | |
705 | else | |
706 | kfree(old_mask); | |
707 | ||
708 | return success; | |
709 | ||
710 | error_disable_all_buffers: | |
711 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
712 | error_run_postdisable: | |
713 | if (indio_dev->setup_ops->postdisable) | |
714 | indio_dev->setup_ops->postdisable(indio_dev); | |
715 | error_remove_inserted: | |
84b36ce5 | 716 | if (insert_buffer) |
9e69c935 | 717 | iio_buffer_deactivate(insert_buffer); |
84b36ce5 JC |
718 | indio_dev->active_scan_mask = old_mask; |
719 | kfree(compound_mask); | |
84b36ce5 JC |
720 | return ret; |
721 | } | |
a9519456 LPC |
722 | |
723 | int iio_update_buffers(struct iio_dev *indio_dev, | |
724 | struct iio_buffer *insert_buffer, | |
725 | struct iio_buffer *remove_buffer) | |
726 | { | |
727 | int ret; | |
728 | ||
3909fab5 LPC |
729 | if (insert_buffer == remove_buffer) |
730 | return 0; | |
731 | ||
a9519456 LPC |
732 | mutex_lock(&indio_dev->info_exist_lock); |
733 | mutex_lock(&indio_dev->mlock); | |
734 | ||
3909fab5 LPC |
735 | if (insert_buffer && iio_buffer_is_active(insert_buffer)) |
736 | insert_buffer = NULL; | |
737 | ||
738 | if (remove_buffer && !iio_buffer_is_active(remove_buffer)) | |
739 | remove_buffer = NULL; | |
740 | ||
741 | if (!insert_buffer && !remove_buffer) { | |
742 | ret = 0; | |
743 | goto out_unlock; | |
744 | } | |
745 | ||
a9519456 LPC |
746 | if (indio_dev->info == NULL) { |
747 | ret = -ENODEV; | |
748 | goto out_unlock; | |
749 | } | |
750 | ||
751 | ret = __iio_update_buffers(indio_dev, insert_buffer, remove_buffer); | |
752 | ||
753 | out_unlock: | |
754 | mutex_unlock(&indio_dev->mlock); | |
755 | mutex_unlock(&indio_dev->info_exist_lock); | |
756 | ||
757 | return ret; | |
758 | } | |
84b36ce5 JC |
759 | EXPORT_SYMBOL_GPL(iio_update_buffers); |
760 | ||
761 | ssize_t iio_buffer_store_enable(struct device *dev, | |
762 | struct device_attribute *attr, | |
763 | const char *buf, | |
764 | size_t len) | |
765 | { | |
766 | int ret; | |
767 | bool requested_state; | |
768 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
84b36ce5 JC |
769 | bool inlist; |
770 | ||
771 | ret = strtobool(buf, &requested_state); | |
772 | if (ret < 0) | |
773 | return ret; | |
774 | ||
775 | mutex_lock(&indio_dev->mlock); | |
776 | ||
777 | /* Find out if it is in the list */ | |
705ee2c9 | 778 | inlist = iio_buffer_is_active(indio_dev->buffer); |
84b36ce5 JC |
779 | /* Already in desired state */ |
780 | if (inlist == requested_state) | |
781 | goto done; | |
782 | ||
783 | if (requested_state) | |
a9519456 | 784 | ret = __iio_update_buffers(indio_dev, |
84b36ce5 JC |
785 | indio_dev->buffer, NULL); |
786 | else | |
a9519456 | 787 | ret = __iio_update_buffers(indio_dev, |
84b36ce5 JC |
788 | NULL, indio_dev->buffer); |
789 | ||
790 | if (ret < 0) | |
791 | goto done; | |
792 | done: | |
793 | mutex_unlock(&indio_dev->mlock); | |
794 | return (ret < 0) ? ret : len; | |
795 | } | |
796 | EXPORT_SYMBOL(iio_buffer_store_enable); | |
797 | ||
81636632 LPC |
798 | /** |
799 | * iio_validate_scan_mask_onehot() - Validates that exactly one channel is selected | |
800 | * @indio_dev: the iio device | |
801 | * @mask: scan mask to be checked | |
802 | * | |
803 | * Return true if exactly one bit is set in the scan mask, false otherwise. It | |
804 | * can be used for devices where only one channel can be active for sampling at | |
805 | * a time. | |
806 | */ | |
807 | bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev, | |
808 | const unsigned long *mask) | |
809 | { | |
810 | return bitmap_weight(mask, indio_dev->masklength) == 1; | |
811 | } | |
812 | EXPORT_SYMBOL_GPL(iio_validate_scan_mask_onehot); | |
813 | ||
939546d1 LPC |
814 | static bool iio_validate_scan_mask(struct iio_dev *indio_dev, |
815 | const unsigned long *mask) | |
816 | { | |
817 | if (!indio_dev->setup_ops->validate_scan_mask) | |
818 | return true; | |
819 | ||
820 | return indio_dev->setup_ops->validate_scan_mask(indio_dev, mask); | |
821 | } | |
822 | ||
32b5eeca JC |
823 | /** |
824 | * iio_scan_mask_set() - set particular bit in the scan mask | |
9572588c | 825 | * @indio_dev: the iio device |
14555b14 | 826 | * @buffer: the buffer whose scan mask we are interested in |
32b5eeca | 827 | * @bit: the bit to be set. |
84b36ce5 JC |
828 | * |
829 | * Note that at this point we have no way of knowing what other | |
830 | * buffers might request, hence this code only verifies that the | |
831 | * individual buffers request is plausible. | |
832 | */ | |
f79a9098 JC |
833 | int iio_scan_mask_set(struct iio_dev *indio_dev, |
834 | struct iio_buffer *buffer, int bit) | |
32b5eeca | 835 | { |
cd4361c7 | 836 | const unsigned long *mask; |
32b5eeca JC |
837 | unsigned long *trialmask; |
838 | ||
839 | trialmask = kmalloc(sizeof(*trialmask)* | |
f8c6f4e9 | 840 | BITS_TO_LONGS(indio_dev->masklength), |
32b5eeca JC |
841 | GFP_KERNEL); |
842 | ||
843 | if (trialmask == NULL) | |
844 | return -ENOMEM; | |
f8c6f4e9 | 845 | if (!indio_dev->masklength) { |
9572588c | 846 | WARN_ON("Trying to set scanmask prior to registering buffer\n"); |
939546d1 | 847 | goto err_invalid_mask; |
32b5eeca | 848 | } |
f8c6f4e9 | 849 | bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength); |
32b5eeca JC |
850 | set_bit(bit, trialmask); |
851 | ||
939546d1 LPC |
852 | if (!iio_validate_scan_mask(indio_dev, trialmask)) |
853 | goto err_invalid_mask; | |
854 | ||
f8c6f4e9 JC |
855 | if (indio_dev->available_scan_masks) { |
856 | mask = iio_scan_mask_match(indio_dev->available_scan_masks, | |
857 | indio_dev->masklength, | |
32b5eeca | 858 | trialmask); |
939546d1 LPC |
859 | if (!mask) |
860 | goto err_invalid_mask; | |
32b5eeca | 861 | } |
f8c6f4e9 | 862 | bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength); |
32b5eeca JC |
863 | |
864 | kfree(trialmask); | |
865 | ||
866 | return 0; | |
939546d1 LPC |
867 | |
868 | err_invalid_mask: | |
869 | kfree(trialmask); | |
870 | return -EINVAL; | |
871 | } | |
32b5eeca JC |
872 | EXPORT_SYMBOL_GPL(iio_scan_mask_set); |
873 | ||
f79a9098 JC |
874 | int iio_scan_mask_query(struct iio_dev *indio_dev, |
875 | struct iio_buffer *buffer, int bit) | |
32b5eeca | 876 | { |
f8c6f4e9 | 877 | if (bit > indio_dev->masklength) |
32b5eeca JC |
878 | return -EINVAL; |
879 | ||
14555b14 | 880 | if (!buffer->scan_mask) |
32b5eeca | 881 | return 0; |
32b5eeca | 882 | |
2076a20f AB |
883 | /* Ensure return value is 0 or 1. */ |
884 | return !!test_bit(bit, buffer->scan_mask); | |
32b5eeca JC |
885 | }; |
886 | EXPORT_SYMBOL_GPL(iio_scan_mask_query); | |
5ada4ea9 JC |
887 | |
888 | /** | |
889 | * struct iio_demux_table() - table describing demux memcpy ops | |
890 | * @from: index to copy from | |
99698b45 | 891 | * @to: index to copy to |
5ada4ea9 JC |
892 | * @length: how many bytes to copy |
893 | * @l: list head used for management | |
894 | */ | |
895 | struct iio_demux_table { | |
896 | unsigned from; | |
897 | unsigned to; | |
898 | unsigned length; | |
899 | struct list_head l; | |
900 | }; | |
901 | ||
5d65d920 LPC |
902 | static const void *iio_demux(struct iio_buffer *buffer, |
903 | const void *datain) | |
5ada4ea9 JC |
904 | { |
905 | struct iio_demux_table *t; | |
906 | ||
907 | if (list_empty(&buffer->demux_list)) | |
908 | return datain; | |
909 | list_for_each_entry(t, &buffer->demux_list, l) | |
910 | memcpy(buffer->demux_bounce + t->to, | |
911 | datain + t->from, t->length); | |
912 | ||
913 | return buffer->demux_bounce; | |
914 | } | |
915 | ||
5d65d920 | 916 | static int iio_push_to_buffer(struct iio_buffer *buffer, const void *data) |
5ada4ea9 | 917 | { |
5d65d920 | 918 | const void *dataout = iio_demux(buffer, data); |
5ada4ea9 | 919 | |
ce56ade6 | 920 | return buffer->access->store_to(buffer, dataout); |
5ada4ea9 | 921 | } |
5ada4ea9 | 922 | |
842cd100 JC |
923 | static void iio_buffer_demux_free(struct iio_buffer *buffer) |
924 | { | |
925 | struct iio_demux_table *p, *q; | |
926 | list_for_each_entry_safe(p, q, &buffer->demux_list, l) { | |
927 | list_del(&p->l); | |
928 | kfree(p); | |
929 | } | |
930 | } | |
931 | ||
84b36ce5 | 932 | |
5d65d920 | 933 | int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data) |
84b36ce5 JC |
934 | { |
935 | int ret; | |
936 | struct iio_buffer *buf; | |
937 | ||
938 | list_for_each_entry(buf, &indio_dev->buffer_list, buffer_list) { | |
939 | ret = iio_push_to_buffer(buf, data); | |
940 | if (ret < 0) | |
941 | return ret; | |
942 | } | |
943 | ||
944 | return 0; | |
945 | } | |
946 | EXPORT_SYMBOL_GPL(iio_push_to_buffers); | |
947 | ||
948 | static int iio_buffer_update_demux(struct iio_dev *indio_dev, | |
949 | struct iio_buffer *buffer) | |
5ada4ea9 JC |
950 | { |
951 | const struct iio_chan_spec *ch; | |
5ada4ea9 JC |
952 | int ret, in_ind = -1, out_ind, length; |
953 | unsigned in_loc = 0, out_loc = 0; | |
842cd100 | 954 | struct iio_demux_table *p; |
5ada4ea9 JC |
955 | |
956 | /* Clear out any old demux */ | |
842cd100 | 957 | iio_buffer_demux_free(buffer); |
5ada4ea9 JC |
958 | kfree(buffer->demux_bounce); |
959 | buffer->demux_bounce = NULL; | |
960 | ||
961 | /* First work out which scan mode we will actually have */ | |
962 | if (bitmap_equal(indio_dev->active_scan_mask, | |
963 | buffer->scan_mask, | |
964 | indio_dev->masklength)) | |
965 | return 0; | |
966 | ||
967 | /* Now we have the two masks, work from least sig and build up sizes */ | |
968 | for_each_set_bit(out_ind, | |
61bd55ce | 969 | buffer->scan_mask, |
5ada4ea9 JC |
970 | indio_dev->masklength) { |
971 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
972 | indio_dev->masklength, | |
973 | in_ind + 1); | |
974 | while (in_ind != out_ind) { | |
975 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
976 | indio_dev->masklength, | |
977 | in_ind + 1); | |
978 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
0ee8546a SP |
979 | if (ch->scan_type.repeat > 1) |
980 | length = ch->scan_type.storagebits / 8 * | |
981 | ch->scan_type.repeat; | |
982 | else | |
983 | length = ch->scan_type.storagebits / 8; | |
5ada4ea9 JC |
984 | /* Make sure we are aligned */ |
985 | in_loc += length; | |
986 | if (in_loc % length) | |
987 | in_loc += length - in_loc % length; | |
988 | } | |
989 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
990 | if (p == NULL) { | |
991 | ret = -ENOMEM; | |
992 | goto error_clear_mux_table; | |
993 | } | |
994 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
0ee8546a SP |
995 | if (ch->scan_type.repeat > 1) |
996 | length = ch->scan_type.storagebits / 8 * | |
997 | ch->scan_type.repeat; | |
998 | else | |
999 | length = ch->scan_type.storagebits / 8; | |
5ada4ea9 JC |
1000 | if (out_loc % length) |
1001 | out_loc += length - out_loc % length; | |
1002 | if (in_loc % length) | |
1003 | in_loc += length - in_loc % length; | |
1004 | p->from = in_loc; | |
1005 | p->to = out_loc; | |
1006 | p->length = length; | |
1007 | list_add_tail(&p->l, &buffer->demux_list); | |
1008 | out_loc += length; | |
1009 | in_loc += length; | |
1010 | } | |
1011 | /* Relies on scan_timestamp being last */ | |
1012 | if (buffer->scan_timestamp) { | |
1013 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
1014 | if (p == NULL) { | |
1015 | ret = -ENOMEM; | |
1016 | goto error_clear_mux_table; | |
1017 | } | |
1018 | ch = iio_find_channel_from_si(indio_dev, | |
f1264809 | 1019 | indio_dev->scan_index_timestamp); |
0ee8546a SP |
1020 | if (ch->scan_type.repeat > 1) |
1021 | length = ch->scan_type.storagebits / 8 * | |
1022 | ch->scan_type.repeat; | |
1023 | else | |
1024 | length = ch->scan_type.storagebits / 8; | |
5ada4ea9 JC |
1025 | if (out_loc % length) |
1026 | out_loc += length - out_loc % length; | |
1027 | if (in_loc % length) | |
1028 | in_loc += length - in_loc % length; | |
1029 | p->from = in_loc; | |
1030 | p->to = out_loc; | |
1031 | p->length = length; | |
1032 | list_add_tail(&p->l, &buffer->demux_list); | |
1033 | out_loc += length; | |
1034 | in_loc += length; | |
1035 | } | |
1036 | buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL); | |
1037 | if (buffer->demux_bounce == NULL) { | |
1038 | ret = -ENOMEM; | |
1039 | goto error_clear_mux_table; | |
1040 | } | |
1041 | return 0; | |
1042 | ||
1043 | error_clear_mux_table: | |
842cd100 JC |
1044 | iio_buffer_demux_free(buffer); |
1045 | ||
5ada4ea9 JC |
1046 | return ret; |
1047 | } | |
84b36ce5 JC |
1048 | |
1049 | int iio_update_demux(struct iio_dev *indio_dev) | |
1050 | { | |
1051 | struct iio_buffer *buffer; | |
1052 | int ret; | |
1053 | ||
1054 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { | |
1055 | ret = iio_buffer_update_demux(indio_dev, buffer); | |
1056 | if (ret < 0) | |
1057 | goto error_clear_mux_table; | |
1058 | } | |
1059 | return 0; | |
1060 | ||
1061 | error_clear_mux_table: | |
1062 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) | |
1063 | iio_buffer_demux_free(buffer); | |
1064 | ||
1065 | return ret; | |
1066 | } | |
5ada4ea9 | 1067 | EXPORT_SYMBOL_GPL(iio_update_demux); |
9e69c935 LPC |
1068 | |
1069 | /** | |
1070 | * iio_buffer_release() - Free a buffer's resources | |
1071 | * @ref: Pointer to the kref embedded in the iio_buffer struct | |
1072 | * | |
1073 | * This function is called when the last reference to the buffer has been | |
1074 | * dropped. It will typically free all resources allocated by the buffer. Do not | |
1075 | * call this function manually, always use iio_buffer_put() when done using a | |
1076 | * buffer. | |
1077 | */ | |
1078 | static void iio_buffer_release(struct kref *ref) | |
1079 | { | |
1080 | struct iio_buffer *buffer = container_of(ref, struct iio_buffer, ref); | |
1081 | ||
1082 | buffer->access->release(buffer); | |
1083 | } | |
1084 | ||
1085 | /** | |
1086 | * iio_buffer_get() - Grab a reference to the buffer | |
1087 | * @buffer: The buffer to grab a reference for, may be NULL | |
1088 | * | |
1089 | * Returns the pointer to the buffer that was passed into the function. | |
1090 | */ | |
1091 | struct iio_buffer *iio_buffer_get(struct iio_buffer *buffer) | |
1092 | { | |
1093 | if (buffer) | |
1094 | kref_get(&buffer->ref); | |
1095 | ||
1096 | return buffer; | |
1097 | } | |
1098 | EXPORT_SYMBOL_GPL(iio_buffer_get); | |
1099 | ||
1100 | /** | |
1101 | * iio_buffer_put() - Release the reference to the buffer | |
1102 | * @buffer: The buffer to release the reference for, may be NULL | |
1103 | */ | |
1104 | void iio_buffer_put(struct iio_buffer *buffer) | |
1105 | { | |
1106 | if (buffer) | |
1107 | kref_put(&buffer->ref, iio_buffer_release); | |
1108 | } | |
1109 | EXPORT_SYMBOL_GPL(iio_buffer_put); |