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> | |
17 | #include <linux/device.h> | |
7026ea4b | 18 | #include <linux/fs.h> |
7026ea4b | 19 | #include <linux/cdev.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
a7348347 | 21 | #include <linux/poll.h> |
7026ea4b JC |
22 | |
23 | #include "iio.h" | |
df9c1c42 | 24 | #include "iio_core.h" |
9dd1cb30 | 25 | #include "sysfs.h" |
3811cd62 | 26 | #include "buffer_generic.h" |
7026ea4b | 27 | |
8310b86c JC |
28 | static const char * const iio_endian_prefix[] = { |
29 | [IIO_BE] = "be", | |
30 | [IIO_LE] = "le", | |
31 | }; | |
7026ea4b JC |
32 | |
33 | /** | |
14555b14 | 34 | * iio_buffer_read_first_n_outer() - chrdev read for buffer access |
7026ea4b | 35 | * |
14555b14 JC |
36 | * This function relies on all buffer implementations having an |
37 | * iio_buffer as their first element. | |
7026ea4b | 38 | **/ |
14555b14 JC |
39 | ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf, |
40 | size_t n, loff_t *f_ps) | |
7026ea4b | 41 | { |
1aa04278 | 42 | struct iio_dev *indio_dev = filp->private_data; |
14555b14 | 43 | struct iio_buffer *rb = indio_dev->buffer; |
d5857d65 | 44 | |
5565a450 | 45 | if (!rb->access->read_first_n) |
7026ea4b | 46 | return -EINVAL; |
8d213f24 | 47 | return rb->access->read_first_n(rb, n, buf); |
7026ea4b JC |
48 | } |
49 | ||
a7348347 | 50 | /** |
14555b14 | 51 | * iio_buffer_poll() - poll the buffer to find out if it has data |
a7348347 | 52 | */ |
14555b14 JC |
53 | unsigned int iio_buffer_poll(struct file *filp, |
54 | struct poll_table_struct *wait) | |
a7348347 | 55 | { |
1aa04278 | 56 | struct iio_dev *indio_dev = filp->private_data; |
14555b14 | 57 | struct iio_buffer *rb = indio_dev->buffer; |
a7348347 JC |
58 | |
59 | poll_wait(filp, &rb->pollq, wait); | |
60 | if (rb->stufftoread) | |
61 | return POLLIN | POLLRDNORM; | |
62 | /* need a way of knowing if there may be enough data... */ | |
8d213f24 | 63 | return 0; |
a7348347 JC |
64 | } |
65 | ||
30eb82f0 | 66 | int iio_chrdev_buffer_open(struct iio_dev *indio_dev) |
7026ea4b | 67 | { |
14555b14 | 68 | struct iio_buffer *rb = indio_dev->buffer; |
30eb82f0 JC |
69 | if (!rb) |
70 | return -EINVAL; | |
71 | if (rb->access->mark_in_use) | |
1aa04278 | 72 | rb->access->mark_in_use(rb); |
30eb82f0 | 73 | return 0; |
7026ea4b | 74 | } |
7026ea4b | 75 | |
14555b14 | 76 | void iio_chrdev_buffer_release(struct iio_dev *indio_dev) |
7026ea4b | 77 | { |
14555b14 | 78 | struct iio_buffer *rb = indio_dev->buffer; |
758d988c | 79 | |
1aa04278 JC |
80 | clear_bit(IIO_BUSY_BIT_POS, &rb->flags); |
81 | if (rb->access->unmark_in_use) | |
82 | rb->access->unmark_in_use(rb); | |
7026ea4b JC |
83 | } |
84 | ||
14555b14 | 85 | void iio_buffer_init(struct iio_buffer *buffer, struct iio_dev *dev_info) |
7026ea4b | 86 | { |
14555b14 JC |
87 | buffer->indio_dev = dev_info; |
88 | init_waitqueue_head(&buffer->pollq); | |
7026ea4b | 89 | } |
14555b14 | 90 | EXPORT_SYMBOL(iio_buffer_init); |
7026ea4b | 91 | |
1d892719 | 92 | static ssize_t iio_show_scan_index(struct device *dev, |
8d213f24 JC |
93 | struct device_attribute *attr, |
94 | char *buf) | |
1d892719 | 95 | { |
8d213f24 | 96 | return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index); |
1d892719 JC |
97 | } |
98 | ||
99 | static ssize_t iio_show_fixed_type(struct device *dev, | |
100 | struct device_attribute *attr, | |
101 | char *buf) | |
102 | { | |
103 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
8310b86c JC |
104 | u8 type = this_attr->c->scan_type.endianness; |
105 | ||
106 | if (type == IIO_CPU) { | |
107 | if (__LITTLE_ENDIAN) | |
108 | type = IIO_LE; | |
109 | else | |
110 | type = IIO_BE; | |
111 | } | |
112 | return sprintf(buf, "%s:%c%d/%d>>%u\n", | |
113 | iio_endian_prefix[type], | |
1d892719 JC |
114 | this_attr->c->scan_type.sign, |
115 | this_attr->c->scan_type.realbits, | |
116 | this_attr->c->scan_type.storagebits, | |
117 | this_attr->c->scan_type.shift); | |
118 | } | |
119 | ||
8d213f24 JC |
120 | static ssize_t iio_scan_el_show(struct device *dev, |
121 | struct device_attribute *attr, | |
122 | char *buf) | |
123 | { | |
124 | int ret; | |
1aa04278 | 125 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
8d213f24 | 126 | |
14555b14 | 127 | ret = iio_scan_mask_query(dev_info->buffer, |
1aa04278 | 128 | to_iio_dev_attr(attr)->address); |
8d213f24 JC |
129 | if (ret < 0) |
130 | return ret; | |
131 | return sprintf(buf, "%d\n", ret); | |
132 | } | |
133 | ||
14555b14 | 134 | static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit) |
8d213f24 | 135 | { |
14555b14 JC |
136 | clear_bit(bit, buffer->scan_mask); |
137 | buffer->scan_count--; | |
8d213f24 JC |
138 | return 0; |
139 | } | |
140 | ||
141 | static ssize_t iio_scan_el_store(struct device *dev, | |
142 | struct device_attribute *attr, | |
143 | const char *buf, | |
144 | size_t len) | |
145 | { | |
146 | int ret = 0; | |
147 | bool state; | |
1aa04278 | 148 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 149 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 JC |
150 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
151 | ||
152 | state = !(buf[0] == '0'); | |
153 | mutex_lock(&indio_dev->mlock); | |
ec3afa40 | 154 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { |
8d213f24 JC |
155 | ret = -EBUSY; |
156 | goto error_ret; | |
157 | } | |
14555b14 | 158 | ret = iio_scan_mask_query(buffer, this_attr->address); |
8d213f24 JC |
159 | if (ret < 0) |
160 | goto error_ret; | |
161 | if (!state && ret) { | |
14555b14 | 162 | ret = iio_scan_mask_clear(buffer, this_attr->address); |
8d213f24 JC |
163 | if (ret) |
164 | goto error_ret; | |
165 | } else if (state && !ret) { | |
14555b14 | 166 | ret = iio_scan_mask_set(buffer, this_attr->address); |
8d213f24 JC |
167 | if (ret) |
168 | goto error_ret; | |
169 | } | |
170 | ||
171 | error_ret: | |
172 | mutex_unlock(&indio_dev->mlock); | |
173 | ||
174 | return ret ? ret : len; | |
175 | ||
176 | } | |
177 | ||
178 | static ssize_t iio_scan_el_ts_show(struct device *dev, | |
179 | struct device_attribute *attr, | |
180 | char *buf) | |
181 | { | |
1aa04278 | 182 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
14555b14 | 183 | return sprintf(buf, "%d\n", dev_info->buffer->scan_timestamp); |
8d213f24 JC |
184 | } |
185 | ||
186 | static ssize_t iio_scan_el_ts_store(struct device *dev, | |
187 | struct device_attribute *attr, | |
188 | const char *buf, | |
189 | size_t len) | |
190 | { | |
191 | int ret = 0; | |
1aa04278 | 192 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
8d213f24 | 193 | bool state; |
1aa04278 | 194 | |
8d213f24 JC |
195 | state = !(buf[0] == '0'); |
196 | mutex_lock(&indio_dev->mlock); | |
ec3afa40 | 197 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { |
8d213f24 JC |
198 | ret = -EBUSY; |
199 | goto error_ret; | |
200 | } | |
14555b14 | 201 | indio_dev->buffer->scan_timestamp = state; |
8d213f24 JC |
202 | error_ret: |
203 | mutex_unlock(&indio_dev->mlock); | |
204 | ||
205 | return ret ? ret : len; | |
206 | } | |
207 | ||
14555b14 JC |
208 | static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev, |
209 | const struct iio_chan_spec *chan) | |
1d892719 | 210 | { |
26d25ae3 | 211 | int ret, attrcount = 0; |
14555b14 | 212 | struct iio_buffer *buffer = indio_dev->buffer; |
1d892719 | 213 | |
26d25ae3 | 214 | ret = __iio_add_chan_devattr("index", |
1d892719 JC |
215 | chan, |
216 | &iio_show_scan_index, | |
217 | NULL, | |
218 | 0, | |
219 | 0, | |
1aa04278 | 220 | &indio_dev->dev, |
14555b14 | 221 | &buffer->scan_el_dev_attr_list); |
1d892719 JC |
222 | if (ret) |
223 | goto error_ret; | |
26d25ae3 JC |
224 | attrcount++; |
225 | ret = __iio_add_chan_devattr("type", | |
1d892719 JC |
226 | chan, |
227 | &iio_show_fixed_type, | |
228 | NULL, | |
229 | 0, | |
230 | 0, | |
1aa04278 | 231 | &indio_dev->dev, |
14555b14 | 232 | &buffer->scan_el_dev_attr_list); |
1d892719 JC |
233 | if (ret) |
234 | goto error_ret; | |
26d25ae3 | 235 | attrcount++; |
a88b3ebc | 236 | if (chan->type != IIO_TIMESTAMP) |
26d25ae3 | 237 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
238 | chan, |
239 | &iio_scan_el_show, | |
240 | &iio_scan_el_store, | |
241 | chan->scan_index, | |
242 | 0, | |
1aa04278 | 243 | &indio_dev->dev, |
14555b14 | 244 | &buffer->scan_el_dev_attr_list); |
a88b3ebc | 245 | else |
26d25ae3 | 246 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
247 | chan, |
248 | &iio_scan_el_ts_show, | |
249 | &iio_scan_el_ts_store, | |
250 | chan->scan_index, | |
251 | 0, | |
1aa04278 | 252 | &indio_dev->dev, |
14555b14 | 253 | &buffer->scan_el_dev_attr_list); |
26d25ae3 JC |
254 | attrcount++; |
255 | ret = attrcount; | |
1d892719 JC |
256 | error_ret: |
257 | return ret; | |
258 | } | |
259 | ||
14555b14 JC |
260 | static void iio_buffer_remove_and_free_scan_dev_attr(struct iio_dev *indio_dev, |
261 | struct iio_dev_attr *p) | |
1d892719 | 262 | { |
1d892719 JC |
263 | kfree(p->dev_attr.attr.name); |
264 | kfree(p); | |
265 | } | |
266 | ||
14555b14 | 267 | static void __iio_buffer_attr_cleanup(struct iio_dev *indio_dev) |
1d892719 JC |
268 | { |
269 | struct iio_dev_attr *p, *n; | |
14555b14 | 270 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 | 271 | |
1d892719 | 272 | list_for_each_entry_safe(p, n, |
14555b14 JC |
273 | &buffer->scan_el_dev_attr_list, l) |
274 | iio_buffer_remove_and_free_scan_dev_attr(indio_dev, p); | |
1d892719 JC |
275 | } |
276 | ||
26d25ae3 JC |
277 | static const char * const iio_scan_elements_group_name = "scan_elements"; |
278 | ||
14555b14 JC |
279 | int iio_buffer_register(struct iio_dev *indio_dev, |
280 | const struct iio_chan_spec *channels, | |
281 | int num_channels) | |
1d892719 | 282 | { |
26d25ae3 JC |
283 | struct iio_dev_attr *p; |
284 | struct attribute **attr; | |
14555b14 | 285 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 JC |
286 | int ret, i, attrn, attrcount, attrcount_orig = 0; |
287 | ||
14555b14 JC |
288 | if (buffer->attrs) |
289 | indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs; | |
bf32963c | 290 | |
14555b14 JC |
291 | if (buffer->scan_el_attrs != NULL) { |
292 | attr = buffer->scan_el_attrs->attrs; | |
26d25ae3 JC |
293 | while (*attr++ != NULL) |
294 | attrcount_orig++; | |
295 | } | |
296 | attrcount = attrcount_orig; | |
14555b14 | 297 | INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list); |
1d892719 JC |
298 | if (channels) { |
299 | /* new magic */ | |
300 | for (i = 0; i < num_channels; i++) { | |
32b5eeca JC |
301 | /* Establish necessary mask length */ |
302 | if (channels[i].scan_index > | |
303 | (int)indio_dev->masklength - 1) | |
304 | indio_dev->masklength | |
305 | = indio_dev->channels[i].scan_index + 1; | |
306 | ||
14555b14 | 307 | ret = iio_buffer_add_channel_sysfs(indio_dev, |
1aa04278 | 308 | &channels[i]); |
1d892719 | 309 | if (ret < 0) |
26d25ae3 JC |
310 | goto error_cleanup_dynamic; |
311 | attrcount += ret; | |
1d892719 | 312 | } |
14555b14 JC |
313 | if (indio_dev->masklength && buffer->scan_mask == NULL) { |
314 | buffer->scan_mask | |
315 | = kzalloc(sizeof(*buffer->scan_mask)* | |
32b5eeca JC |
316 | BITS_TO_LONGS(indio_dev->masklength), |
317 | GFP_KERNEL); | |
14555b14 | 318 | if (buffer->scan_mask == NULL) { |
32b5eeca | 319 | ret = -ENOMEM; |
26d25ae3 | 320 | goto error_cleanup_dynamic; |
32b5eeca JC |
321 | } |
322 | } | |
1d892719 JC |
323 | } |
324 | ||
14555b14 | 325 | buffer->scan_el_group.name = iio_scan_elements_group_name; |
26d25ae3 | 326 | |
14555b14 JC |
327 | buffer->scan_el_group.attrs |
328 | = kzalloc(sizeof(buffer->scan_el_group.attrs[0])* | |
329 | (attrcount + 1), | |
26d25ae3 | 330 | GFP_KERNEL); |
14555b14 | 331 | if (buffer->scan_el_group.attrs == NULL) { |
26d25ae3 JC |
332 | ret = -ENOMEM; |
333 | goto error_free_scan_mask; | |
334 | } | |
14555b14 JC |
335 | if (buffer->scan_el_attrs) |
336 | memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs, | |
337 | sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig); | |
26d25ae3 JC |
338 | attrn = attrcount_orig; |
339 | ||
14555b14 JC |
340 | list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l) |
341 | buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr; | |
342 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group; | |
26d25ae3 | 343 | |
1d892719 | 344 | return 0; |
26d25ae3 JC |
345 | |
346 | error_free_scan_mask: | |
14555b14 | 347 | kfree(buffer->scan_mask); |
1d892719 | 348 | error_cleanup_dynamic: |
14555b14 | 349 | __iio_buffer_attr_cleanup(indio_dev); |
26d25ae3 | 350 | |
7026ea4b JC |
351 | return ret; |
352 | } | |
14555b14 | 353 | EXPORT_SYMBOL(iio_buffer_register); |
1d892719 | 354 | |
14555b14 | 355 | void iio_buffer_unregister(struct iio_dev *indio_dev) |
7026ea4b | 356 | { |
14555b14 JC |
357 | kfree(indio_dev->buffer->scan_mask); |
358 | kfree(indio_dev->buffer->scan_el_group.attrs); | |
359 | __iio_buffer_attr_cleanup(indio_dev); | |
7026ea4b | 360 | } |
14555b14 | 361 | EXPORT_SYMBOL(iio_buffer_unregister); |
7026ea4b | 362 | |
14555b14 JC |
363 | ssize_t iio_buffer_read_length(struct device *dev, |
364 | struct device_attribute *attr, | |
365 | char *buf) | |
7026ea4b | 366 | { |
1aa04278 | 367 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 368 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 369 | |
14555b14 | 370 | if (buffer->access->get_length) |
8d213f24 | 371 | return sprintf(buf, "%d\n", |
14555b14 | 372 | buffer->access->get_length(buffer)); |
7026ea4b | 373 | |
8d213f24 | 374 | return 0; |
7026ea4b | 375 | } |
14555b14 | 376 | EXPORT_SYMBOL(iio_buffer_read_length); |
7026ea4b | 377 | |
14555b14 JC |
378 | ssize_t iio_buffer_write_length(struct device *dev, |
379 | struct device_attribute *attr, | |
380 | const char *buf, | |
381 | size_t len) | |
7026ea4b JC |
382 | { |
383 | int ret; | |
384 | ulong val; | |
1aa04278 | 385 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 386 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 | 387 | |
7026ea4b JC |
388 | ret = strict_strtoul(buf, 10, &val); |
389 | if (ret) | |
390 | return ret; | |
391 | ||
14555b14 JC |
392 | if (buffer->access->get_length) |
393 | if (val == buffer->access->get_length(buffer)) | |
7026ea4b JC |
394 | return len; |
395 | ||
14555b14 JC |
396 | if (buffer->access->set_length) { |
397 | buffer->access->set_length(buffer, val); | |
398 | if (buffer->access->mark_param_change) | |
399 | buffer->access->mark_param_change(buffer); | |
7026ea4b JC |
400 | } |
401 | ||
402 | return len; | |
403 | } | |
14555b14 | 404 | EXPORT_SYMBOL(iio_buffer_write_length); |
7026ea4b | 405 | |
14555b14 JC |
406 | ssize_t iio_buffer_read_bytes_per_datum(struct device *dev, |
407 | struct device_attribute *attr, | |
408 | char *buf) | |
7026ea4b | 409 | { |
1aa04278 | 410 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 411 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 412 | |
14555b14 | 413 | if (buffer->access->get_bytes_per_datum) |
8d213f24 | 414 | return sprintf(buf, "%d\n", |
14555b14 | 415 | buffer->access->get_bytes_per_datum(buffer)); |
7026ea4b | 416 | |
8d213f24 | 417 | return 0; |
7026ea4b | 418 | } |
14555b14 | 419 | EXPORT_SYMBOL(iio_buffer_read_bytes_per_datum); |
7026ea4b | 420 | |
14555b14 JC |
421 | ssize_t iio_buffer_store_enable(struct device *dev, |
422 | struct device_attribute *attr, | |
423 | const char *buf, | |
424 | size_t len) | |
7026ea4b JC |
425 | { |
426 | int ret; | |
427 | bool requested_state, current_state; | |
428 | int previous_mode; | |
1aa04278 | 429 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
14555b14 | 430 | struct iio_buffer *buffer = dev_info->buffer; |
7026ea4b JC |
431 | |
432 | mutex_lock(&dev_info->mlock); | |
433 | previous_mode = dev_info->currentmode; | |
434 | requested_state = !(buf[0] == '0'); | |
ec3afa40 | 435 | current_state = !!(previous_mode & INDIO_ALL_BUFFER_MODES); |
7026ea4b | 436 | if (current_state == requested_state) { |
14555b14 | 437 | printk(KERN_INFO "iio-buffer, current state requested again\n"); |
7026ea4b JC |
438 | goto done; |
439 | } | |
440 | if (requested_state) { | |
14555b14 JC |
441 | if (buffer->setup_ops->preenable) { |
442 | ret = buffer->setup_ops->preenable(dev_info); | |
7026ea4b JC |
443 | if (ret) { |
444 | printk(KERN_ERR | |
445 | "Buffer not started:" | |
14555b14 | 446 | "buffer preenable failed\n"); |
7026ea4b JC |
447 | goto error_ret; |
448 | } | |
449 | } | |
14555b14 JC |
450 | if (buffer->access->request_update) { |
451 | ret = buffer->access->request_update(buffer); | |
7026ea4b JC |
452 | if (ret) { |
453 | printk(KERN_INFO | |
454 | "Buffer not started:" | |
14555b14 | 455 | "buffer parameter update failed\n"); |
7026ea4b JC |
456 | goto error_ret; |
457 | } | |
458 | } | |
14555b14 JC |
459 | if (buffer->access->mark_in_use) |
460 | buffer->access->mark_in_use(buffer); | |
7026ea4b | 461 | /* Definitely possible for devices to support both of these.*/ |
ec3afa40 | 462 | if (dev_info->modes & INDIO_BUFFER_TRIGGERED) { |
7026ea4b JC |
463 | if (!dev_info->trig) { |
464 | printk(KERN_INFO | |
465 | "Buffer not started: no trigger\n"); | |
466 | ret = -EINVAL; | |
14555b14 JC |
467 | if (buffer->access->unmark_in_use) |
468 | buffer->access->unmark_in_use(buffer); | |
7026ea4b JC |
469 | goto error_ret; |
470 | } | |
ec3afa40 JC |
471 | dev_info->currentmode = INDIO_BUFFER_TRIGGERED; |
472 | } else if (dev_info->modes & INDIO_BUFFER_HARDWARE) | |
473 | dev_info->currentmode = INDIO_BUFFER_HARDWARE; | |
7026ea4b JC |
474 | else { /* should never be reached */ |
475 | ret = -EINVAL; | |
476 | goto error_ret; | |
477 | } | |
478 | ||
14555b14 JC |
479 | if (buffer->setup_ops->postenable) { |
480 | ret = buffer->setup_ops->postenable(dev_info); | |
7026ea4b JC |
481 | if (ret) { |
482 | printk(KERN_INFO | |
483 | "Buffer not started:" | |
484 | "postenable failed\n"); | |
14555b14 JC |
485 | if (buffer->access->unmark_in_use) |
486 | buffer->access->unmark_in_use(buffer); | |
7026ea4b | 487 | dev_info->currentmode = previous_mode; |
14555b14 JC |
488 | if (buffer->setup_ops->postdisable) |
489 | buffer->setup_ops-> | |
490 | postdisable(dev_info); | |
7026ea4b JC |
491 | goto error_ret; |
492 | } | |
493 | } | |
494 | } else { | |
14555b14 JC |
495 | if (buffer->setup_ops->predisable) { |
496 | ret = buffer->setup_ops->predisable(dev_info); | |
7026ea4b JC |
497 | if (ret) |
498 | goto error_ret; | |
499 | } | |
14555b14 JC |
500 | if (buffer->access->unmark_in_use) |
501 | buffer->access->unmark_in_use(buffer); | |
7026ea4b | 502 | dev_info->currentmode = INDIO_DIRECT_MODE; |
14555b14 JC |
503 | if (buffer->setup_ops->postdisable) { |
504 | ret = buffer->setup_ops->postdisable(dev_info); | |
7026ea4b JC |
505 | if (ret) |
506 | goto error_ret; | |
507 | } | |
508 | } | |
509 | done: | |
510 | mutex_unlock(&dev_info->mlock); | |
511 | return len; | |
512 | ||
513 | error_ret: | |
514 | mutex_unlock(&dev_info->mlock); | |
515 | return ret; | |
516 | } | |
14555b14 | 517 | EXPORT_SYMBOL(iio_buffer_store_enable); |
8d213f24 | 518 | |
14555b14 JC |
519 | ssize_t iio_buffer_show_enable(struct device *dev, |
520 | struct device_attribute *attr, | |
521 | char *buf) | |
7026ea4b | 522 | { |
1aa04278 JC |
523 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
524 | return sprintf(buf, "%d\n", !!(dev_info->currentmode | |
ec3afa40 | 525 | & INDIO_ALL_BUFFER_MODES)); |
7026ea4b | 526 | } |
14555b14 | 527 | EXPORT_SYMBOL(iio_buffer_show_enable); |
7026ea4b | 528 | |
14555b14 | 529 | int iio_sw_buffer_preenable(struct iio_dev *indio_dev) |
5565a450 | 530 | { |
14555b14 | 531 | struct iio_buffer *buffer = indio_dev->buffer; |
5565a450 JC |
532 | size_t size; |
533 | dev_dbg(&indio_dev->dev, "%s\n", __func__); | |
534 | /* Check if there are any scan elements enabled, if not fail*/ | |
14555b14 | 535 | if (!(buffer->scan_count || buffer->scan_timestamp)) |
5565a450 | 536 | return -EINVAL; |
14555b14 JC |
537 | if (buffer->scan_timestamp) |
538 | if (buffer->scan_count) | |
5565a450 | 539 | /* Timestamp (aligned to s64) and data */ |
14555b14 | 540 | size = (((buffer->scan_count * buffer->bpe) |
5565a450 JC |
541 | + sizeof(s64) - 1) |
542 | & ~(sizeof(s64) - 1)) | |
543 | + sizeof(s64); | |
544 | else /* Timestamp only */ | |
545 | size = sizeof(s64); | |
546 | else /* Data only */ | |
14555b14 JC |
547 | size = buffer->scan_count * buffer->bpe; |
548 | buffer->access->set_bytes_per_datum(buffer, size); | |
5565a450 JC |
549 | |
550 | return 0; | |
551 | } | |
14555b14 | 552 | EXPORT_SYMBOL(iio_sw_buffer_preenable); |
32b5eeca JC |
553 | |
554 | ||
555 | /* note NULL used as error indicator as it doesn't make sense. */ | |
556 | static unsigned long *iio_scan_mask_match(unsigned long *av_masks, | |
557 | unsigned int masklength, | |
558 | unsigned long *mask) | |
559 | { | |
560 | if (bitmap_empty(mask, masklength)) | |
561 | return NULL; | |
562 | while (*av_masks) { | |
563 | if (bitmap_subset(mask, av_masks, masklength)) | |
564 | return av_masks; | |
565 | av_masks += BITS_TO_LONGS(masklength); | |
566 | } | |
567 | return NULL; | |
568 | } | |
569 | ||
570 | /** | |
571 | * iio_scan_mask_set() - set particular bit in the scan mask | |
14555b14 | 572 | * @buffer: the buffer whose scan mask we are interested in |
32b5eeca JC |
573 | * @bit: the bit to be set. |
574 | **/ | |
14555b14 | 575 | int iio_scan_mask_set(struct iio_buffer *buffer, int bit) |
32b5eeca | 576 | { |
14555b14 | 577 | struct iio_dev *dev_info = buffer->indio_dev; |
32b5eeca JC |
578 | unsigned long *mask; |
579 | unsigned long *trialmask; | |
580 | ||
581 | trialmask = kmalloc(sizeof(*trialmask)* | |
582 | BITS_TO_LONGS(dev_info->masklength), | |
583 | GFP_KERNEL); | |
584 | ||
585 | if (trialmask == NULL) | |
586 | return -ENOMEM; | |
587 | if (!dev_info->masklength) { | |
14555b14 | 588 | WARN_ON("trying to set scanmask prior to registering buffer\n"); |
32b5eeca JC |
589 | kfree(trialmask); |
590 | return -EINVAL; | |
591 | } | |
14555b14 | 592 | bitmap_copy(trialmask, buffer->scan_mask, dev_info->masklength); |
32b5eeca JC |
593 | set_bit(bit, trialmask); |
594 | ||
595 | if (dev_info->available_scan_masks) { | |
596 | mask = iio_scan_mask_match(dev_info->available_scan_masks, | |
597 | dev_info->masklength, | |
598 | trialmask); | |
599 | if (!mask) { | |
600 | kfree(trialmask); | |
601 | return -EINVAL; | |
602 | } | |
603 | } | |
14555b14 JC |
604 | bitmap_copy(buffer->scan_mask, trialmask, dev_info->masklength); |
605 | buffer->scan_count++; | |
32b5eeca JC |
606 | |
607 | kfree(trialmask); | |
608 | ||
609 | return 0; | |
610 | }; | |
611 | EXPORT_SYMBOL_GPL(iio_scan_mask_set); | |
612 | ||
14555b14 | 613 | int iio_scan_mask_query(struct iio_buffer *buffer, int bit) |
32b5eeca | 614 | { |
14555b14 | 615 | struct iio_dev *dev_info = buffer->indio_dev; |
32b5eeca JC |
616 | long *mask; |
617 | ||
618 | if (bit > dev_info->masklength) | |
619 | return -EINVAL; | |
620 | ||
14555b14 | 621 | if (!buffer->scan_mask) |
32b5eeca JC |
622 | return 0; |
623 | if (dev_info->available_scan_masks) | |
624 | mask = iio_scan_mask_match(dev_info->available_scan_masks, | |
625 | dev_info->masklength, | |
14555b14 | 626 | buffer->scan_mask); |
32b5eeca | 627 | else |
14555b14 | 628 | mask = buffer->scan_mask; |
32b5eeca JC |
629 | if (!mask) |
630 | return 0; | |
631 | ||
632 | return test_bit(bit, mask); | |
633 | }; | |
634 | EXPORT_SYMBOL_GPL(iio_scan_mask_query); |