Commit | Line | Data |
---|---|---|
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) { | |
9d5d1153 JC |
107 | #ifdef __LITTLE_ENDIAN |
108 | type = IIO_LE; | |
109 | #else | |
110 | type = IIO_BE; | |
111 | #endif | |
8310b86c JC |
112 | } |
113 | return sprintf(buf, "%s:%c%d/%d>>%u\n", | |
114 | iio_endian_prefix[type], | |
1d892719 JC |
115 | this_attr->c->scan_type.sign, |
116 | this_attr->c->scan_type.realbits, | |
117 | this_attr->c->scan_type.storagebits, | |
118 | this_attr->c->scan_type.shift); | |
119 | } | |
120 | ||
8d213f24 JC |
121 | static ssize_t iio_scan_el_show(struct device *dev, |
122 | struct device_attribute *attr, | |
123 | char *buf) | |
124 | { | |
125 | int ret; | |
1aa04278 | 126 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
8d213f24 | 127 | |
14555b14 | 128 | ret = iio_scan_mask_query(dev_info->buffer, |
1aa04278 | 129 | to_iio_dev_attr(attr)->address); |
8d213f24 JC |
130 | if (ret < 0) |
131 | return ret; | |
132 | return sprintf(buf, "%d\n", ret); | |
133 | } | |
134 | ||
14555b14 | 135 | static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit) |
8d213f24 | 136 | { |
14555b14 JC |
137 | clear_bit(bit, buffer->scan_mask); |
138 | buffer->scan_count--; | |
8d213f24 JC |
139 | return 0; |
140 | } | |
141 | ||
142 | static ssize_t iio_scan_el_store(struct device *dev, | |
143 | struct device_attribute *attr, | |
144 | const char *buf, | |
145 | size_t len) | |
146 | { | |
147 | int ret = 0; | |
148 | bool state; | |
1aa04278 | 149 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 150 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 JC |
151 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
152 | ||
153 | state = !(buf[0] == '0'); | |
154 | mutex_lock(&indio_dev->mlock); | |
ec3afa40 | 155 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { |
8d213f24 JC |
156 | ret = -EBUSY; |
157 | goto error_ret; | |
158 | } | |
14555b14 | 159 | ret = iio_scan_mask_query(buffer, this_attr->address); |
8d213f24 JC |
160 | if (ret < 0) |
161 | goto error_ret; | |
162 | if (!state && ret) { | |
14555b14 | 163 | ret = iio_scan_mask_clear(buffer, this_attr->address); |
8d213f24 JC |
164 | if (ret) |
165 | goto error_ret; | |
166 | } else if (state && !ret) { | |
14555b14 | 167 | ret = iio_scan_mask_set(buffer, this_attr->address); |
8d213f24 JC |
168 | if (ret) |
169 | goto error_ret; | |
170 | } | |
171 | ||
172 | error_ret: | |
173 | mutex_unlock(&indio_dev->mlock); | |
174 | ||
175 | return ret ? ret : len; | |
176 | ||
177 | } | |
178 | ||
179 | static ssize_t iio_scan_el_ts_show(struct device *dev, | |
180 | struct device_attribute *attr, | |
181 | char *buf) | |
182 | { | |
1aa04278 | 183 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
14555b14 | 184 | return sprintf(buf, "%d\n", dev_info->buffer->scan_timestamp); |
8d213f24 JC |
185 | } |
186 | ||
187 | static ssize_t iio_scan_el_ts_store(struct device *dev, | |
188 | struct device_attribute *attr, | |
189 | const char *buf, | |
190 | size_t len) | |
191 | { | |
192 | int ret = 0; | |
1aa04278 | 193 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
8d213f24 | 194 | bool state; |
1aa04278 | 195 | |
8d213f24 JC |
196 | state = !(buf[0] == '0'); |
197 | mutex_lock(&indio_dev->mlock); | |
ec3afa40 | 198 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { |
8d213f24 JC |
199 | ret = -EBUSY; |
200 | goto error_ret; | |
201 | } | |
14555b14 | 202 | indio_dev->buffer->scan_timestamp = state; |
8d213f24 JC |
203 | error_ret: |
204 | mutex_unlock(&indio_dev->mlock); | |
205 | ||
206 | return ret ? ret : len; | |
207 | } | |
208 | ||
14555b14 JC |
209 | static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev, |
210 | const struct iio_chan_spec *chan) | |
1d892719 | 211 | { |
26d25ae3 | 212 | int ret, attrcount = 0; |
14555b14 | 213 | struct iio_buffer *buffer = indio_dev->buffer; |
1d892719 | 214 | |
26d25ae3 | 215 | ret = __iio_add_chan_devattr("index", |
1d892719 JC |
216 | chan, |
217 | &iio_show_scan_index, | |
218 | NULL, | |
219 | 0, | |
220 | 0, | |
1aa04278 | 221 | &indio_dev->dev, |
14555b14 | 222 | &buffer->scan_el_dev_attr_list); |
1d892719 JC |
223 | if (ret) |
224 | goto error_ret; | |
26d25ae3 JC |
225 | attrcount++; |
226 | ret = __iio_add_chan_devattr("type", | |
1d892719 JC |
227 | chan, |
228 | &iio_show_fixed_type, | |
229 | NULL, | |
230 | 0, | |
231 | 0, | |
1aa04278 | 232 | &indio_dev->dev, |
14555b14 | 233 | &buffer->scan_el_dev_attr_list); |
1d892719 JC |
234 | if (ret) |
235 | goto error_ret; | |
26d25ae3 | 236 | attrcount++; |
a88b3ebc | 237 | if (chan->type != IIO_TIMESTAMP) |
26d25ae3 | 238 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
239 | chan, |
240 | &iio_scan_el_show, | |
241 | &iio_scan_el_store, | |
242 | chan->scan_index, | |
243 | 0, | |
1aa04278 | 244 | &indio_dev->dev, |
14555b14 | 245 | &buffer->scan_el_dev_attr_list); |
a88b3ebc | 246 | else |
26d25ae3 | 247 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
248 | chan, |
249 | &iio_scan_el_ts_show, | |
250 | &iio_scan_el_ts_store, | |
251 | chan->scan_index, | |
252 | 0, | |
1aa04278 | 253 | &indio_dev->dev, |
14555b14 | 254 | &buffer->scan_el_dev_attr_list); |
26d25ae3 JC |
255 | attrcount++; |
256 | ret = attrcount; | |
1d892719 JC |
257 | error_ret: |
258 | return ret; | |
259 | } | |
260 | ||
14555b14 JC |
261 | static void iio_buffer_remove_and_free_scan_dev_attr(struct iio_dev *indio_dev, |
262 | struct iio_dev_attr *p) | |
1d892719 | 263 | { |
1d892719 JC |
264 | kfree(p->dev_attr.attr.name); |
265 | kfree(p); | |
266 | } | |
267 | ||
14555b14 | 268 | static void __iio_buffer_attr_cleanup(struct iio_dev *indio_dev) |
1d892719 JC |
269 | { |
270 | struct iio_dev_attr *p, *n; | |
14555b14 | 271 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 | 272 | |
1d892719 | 273 | list_for_each_entry_safe(p, n, |
14555b14 JC |
274 | &buffer->scan_el_dev_attr_list, l) |
275 | iio_buffer_remove_and_free_scan_dev_attr(indio_dev, p); | |
1d892719 JC |
276 | } |
277 | ||
26d25ae3 JC |
278 | static const char * const iio_scan_elements_group_name = "scan_elements"; |
279 | ||
14555b14 JC |
280 | int iio_buffer_register(struct iio_dev *indio_dev, |
281 | const struct iio_chan_spec *channels, | |
282 | int num_channels) | |
1d892719 | 283 | { |
26d25ae3 JC |
284 | struct iio_dev_attr *p; |
285 | struct attribute **attr; | |
14555b14 | 286 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 JC |
287 | int ret, i, attrn, attrcount, attrcount_orig = 0; |
288 | ||
14555b14 JC |
289 | if (buffer->attrs) |
290 | indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs; | |
bf32963c | 291 | |
14555b14 JC |
292 | if (buffer->scan_el_attrs != NULL) { |
293 | attr = buffer->scan_el_attrs->attrs; | |
26d25ae3 JC |
294 | while (*attr++ != NULL) |
295 | attrcount_orig++; | |
296 | } | |
297 | attrcount = attrcount_orig; | |
14555b14 | 298 | INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list); |
1d892719 JC |
299 | if (channels) { |
300 | /* new magic */ | |
301 | for (i = 0; i < num_channels; i++) { | |
32b5eeca JC |
302 | /* Establish necessary mask length */ |
303 | if (channels[i].scan_index > | |
304 | (int)indio_dev->masklength - 1) | |
305 | indio_dev->masklength | |
306 | = indio_dev->channels[i].scan_index + 1; | |
307 | ||
14555b14 | 308 | ret = iio_buffer_add_channel_sysfs(indio_dev, |
1aa04278 | 309 | &channels[i]); |
1d892719 | 310 | if (ret < 0) |
26d25ae3 JC |
311 | goto error_cleanup_dynamic; |
312 | attrcount += ret; | |
1d892719 | 313 | } |
14555b14 JC |
314 | if (indio_dev->masklength && buffer->scan_mask == NULL) { |
315 | buffer->scan_mask | |
316 | = kzalloc(sizeof(*buffer->scan_mask)* | |
32b5eeca JC |
317 | BITS_TO_LONGS(indio_dev->masklength), |
318 | GFP_KERNEL); | |
14555b14 | 319 | if (buffer->scan_mask == NULL) { |
32b5eeca | 320 | ret = -ENOMEM; |
26d25ae3 | 321 | goto error_cleanup_dynamic; |
32b5eeca JC |
322 | } |
323 | } | |
1d892719 JC |
324 | } |
325 | ||
14555b14 | 326 | buffer->scan_el_group.name = iio_scan_elements_group_name; |
26d25ae3 | 327 | |
14555b14 JC |
328 | buffer->scan_el_group.attrs |
329 | = kzalloc(sizeof(buffer->scan_el_group.attrs[0])* | |
330 | (attrcount + 1), | |
26d25ae3 | 331 | GFP_KERNEL); |
14555b14 | 332 | if (buffer->scan_el_group.attrs == NULL) { |
26d25ae3 JC |
333 | ret = -ENOMEM; |
334 | goto error_free_scan_mask; | |
335 | } | |
14555b14 JC |
336 | if (buffer->scan_el_attrs) |
337 | memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs, | |
338 | sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig); | |
26d25ae3 JC |
339 | attrn = attrcount_orig; |
340 | ||
14555b14 JC |
341 | list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l) |
342 | buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr; | |
343 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group; | |
26d25ae3 | 344 | |
1d892719 | 345 | return 0; |
26d25ae3 JC |
346 | |
347 | error_free_scan_mask: | |
14555b14 | 348 | kfree(buffer->scan_mask); |
1d892719 | 349 | error_cleanup_dynamic: |
14555b14 | 350 | __iio_buffer_attr_cleanup(indio_dev); |
26d25ae3 | 351 | |
7026ea4b JC |
352 | return ret; |
353 | } | |
14555b14 | 354 | EXPORT_SYMBOL(iio_buffer_register); |
1d892719 | 355 | |
14555b14 | 356 | void iio_buffer_unregister(struct iio_dev *indio_dev) |
7026ea4b | 357 | { |
14555b14 JC |
358 | kfree(indio_dev->buffer->scan_mask); |
359 | kfree(indio_dev->buffer->scan_el_group.attrs); | |
360 | __iio_buffer_attr_cleanup(indio_dev); | |
7026ea4b | 361 | } |
14555b14 | 362 | EXPORT_SYMBOL(iio_buffer_unregister); |
7026ea4b | 363 | |
14555b14 JC |
364 | ssize_t iio_buffer_read_length(struct device *dev, |
365 | struct device_attribute *attr, | |
366 | char *buf) | |
7026ea4b | 367 | { |
1aa04278 | 368 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 369 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 370 | |
14555b14 | 371 | if (buffer->access->get_length) |
8d213f24 | 372 | return sprintf(buf, "%d\n", |
14555b14 | 373 | buffer->access->get_length(buffer)); |
7026ea4b | 374 | |
8d213f24 | 375 | return 0; |
7026ea4b | 376 | } |
14555b14 | 377 | EXPORT_SYMBOL(iio_buffer_read_length); |
7026ea4b | 378 | |
14555b14 JC |
379 | ssize_t iio_buffer_write_length(struct device *dev, |
380 | struct device_attribute *attr, | |
381 | const char *buf, | |
382 | size_t len) | |
7026ea4b JC |
383 | { |
384 | int ret; | |
385 | ulong val; | |
1aa04278 | 386 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 387 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 | 388 | |
7026ea4b JC |
389 | ret = strict_strtoul(buf, 10, &val); |
390 | if (ret) | |
391 | return ret; | |
392 | ||
14555b14 JC |
393 | if (buffer->access->get_length) |
394 | if (val == buffer->access->get_length(buffer)) | |
7026ea4b JC |
395 | return len; |
396 | ||
14555b14 JC |
397 | if (buffer->access->set_length) { |
398 | buffer->access->set_length(buffer, val); | |
399 | if (buffer->access->mark_param_change) | |
400 | buffer->access->mark_param_change(buffer); | |
7026ea4b JC |
401 | } |
402 | ||
403 | return len; | |
404 | } | |
14555b14 | 405 | EXPORT_SYMBOL(iio_buffer_write_length); |
7026ea4b | 406 | |
14555b14 JC |
407 | ssize_t iio_buffer_read_bytes_per_datum(struct device *dev, |
408 | struct device_attribute *attr, | |
409 | char *buf) | |
7026ea4b | 410 | { |
1aa04278 | 411 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 412 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 413 | |
14555b14 | 414 | if (buffer->access->get_bytes_per_datum) |
8d213f24 | 415 | return sprintf(buf, "%d\n", |
14555b14 | 416 | buffer->access->get_bytes_per_datum(buffer)); |
7026ea4b | 417 | |
8d213f24 | 418 | return 0; |
7026ea4b | 419 | } |
14555b14 | 420 | EXPORT_SYMBOL(iio_buffer_read_bytes_per_datum); |
7026ea4b | 421 | |
14555b14 JC |
422 | ssize_t iio_buffer_store_enable(struct device *dev, |
423 | struct device_attribute *attr, | |
424 | const char *buf, | |
425 | size_t len) | |
7026ea4b JC |
426 | { |
427 | int ret; | |
428 | bool requested_state, current_state; | |
429 | int previous_mode; | |
1aa04278 | 430 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
14555b14 | 431 | struct iio_buffer *buffer = dev_info->buffer; |
7026ea4b JC |
432 | |
433 | mutex_lock(&dev_info->mlock); | |
434 | previous_mode = dev_info->currentmode; | |
435 | requested_state = !(buf[0] == '0'); | |
ec3afa40 | 436 | current_state = !!(previous_mode & INDIO_ALL_BUFFER_MODES); |
7026ea4b | 437 | if (current_state == requested_state) { |
14555b14 | 438 | printk(KERN_INFO "iio-buffer, current state requested again\n"); |
7026ea4b JC |
439 | goto done; |
440 | } | |
441 | if (requested_state) { | |
14555b14 JC |
442 | if (buffer->setup_ops->preenable) { |
443 | ret = buffer->setup_ops->preenable(dev_info); | |
7026ea4b JC |
444 | if (ret) { |
445 | printk(KERN_ERR | |
446 | "Buffer not started:" | |
14555b14 | 447 | "buffer preenable failed\n"); |
7026ea4b JC |
448 | goto error_ret; |
449 | } | |
450 | } | |
14555b14 JC |
451 | if (buffer->access->request_update) { |
452 | ret = buffer->access->request_update(buffer); | |
7026ea4b JC |
453 | if (ret) { |
454 | printk(KERN_INFO | |
455 | "Buffer not started:" | |
14555b14 | 456 | "buffer parameter update failed\n"); |
7026ea4b JC |
457 | goto error_ret; |
458 | } | |
459 | } | |
14555b14 JC |
460 | if (buffer->access->mark_in_use) |
461 | buffer->access->mark_in_use(buffer); | |
7026ea4b | 462 | /* Definitely possible for devices to support both of these.*/ |
ec3afa40 | 463 | if (dev_info->modes & INDIO_BUFFER_TRIGGERED) { |
7026ea4b JC |
464 | if (!dev_info->trig) { |
465 | printk(KERN_INFO | |
466 | "Buffer not started: no trigger\n"); | |
467 | ret = -EINVAL; | |
14555b14 JC |
468 | if (buffer->access->unmark_in_use) |
469 | buffer->access->unmark_in_use(buffer); | |
7026ea4b JC |
470 | goto error_ret; |
471 | } | |
ec3afa40 JC |
472 | dev_info->currentmode = INDIO_BUFFER_TRIGGERED; |
473 | } else if (dev_info->modes & INDIO_BUFFER_HARDWARE) | |
474 | dev_info->currentmode = INDIO_BUFFER_HARDWARE; | |
7026ea4b JC |
475 | else { /* should never be reached */ |
476 | ret = -EINVAL; | |
477 | goto error_ret; | |
478 | } | |
479 | ||
14555b14 JC |
480 | if (buffer->setup_ops->postenable) { |
481 | ret = buffer->setup_ops->postenable(dev_info); | |
7026ea4b JC |
482 | if (ret) { |
483 | printk(KERN_INFO | |
484 | "Buffer not started:" | |
485 | "postenable failed\n"); | |
14555b14 JC |
486 | if (buffer->access->unmark_in_use) |
487 | buffer->access->unmark_in_use(buffer); | |
7026ea4b | 488 | dev_info->currentmode = previous_mode; |
14555b14 JC |
489 | if (buffer->setup_ops->postdisable) |
490 | buffer->setup_ops-> | |
491 | postdisable(dev_info); | |
7026ea4b JC |
492 | goto error_ret; |
493 | } | |
494 | } | |
495 | } else { | |
14555b14 JC |
496 | if (buffer->setup_ops->predisable) { |
497 | ret = buffer->setup_ops->predisable(dev_info); | |
7026ea4b JC |
498 | if (ret) |
499 | goto error_ret; | |
500 | } | |
14555b14 JC |
501 | if (buffer->access->unmark_in_use) |
502 | buffer->access->unmark_in_use(buffer); | |
7026ea4b | 503 | dev_info->currentmode = INDIO_DIRECT_MODE; |
14555b14 JC |
504 | if (buffer->setup_ops->postdisable) { |
505 | ret = buffer->setup_ops->postdisable(dev_info); | |
7026ea4b JC |
506 | if (ret) |
507 | goto error_ret; | |
508 | } | |
509 | } | |
510 | done: | |
511 | mutex_unlock(&dev_info->mlock); | |
512 | return len; | |
513 | ||
514 | error_ret: | |
515 | mutex_unlock(&dev_info->mlock); | |
516 | return ret; | |
517 | } | |
14555b14 | 518 | EXPORT_SYMBOL(iio_buffer_store_enable); |
8d213f24 | 519 | |
14555b14 JC |
520 | ssize_t iio_buffer_show_enable(struct device *dev, |
521 | struct device_attribute *attr, | |
522 | char *buf) | |
7026ea4b | 523 | { |
1aa04278 JC |
524 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
525 | return sprintf(buf, "%d\n", !!(dev_info->currentmode | |
ec3afa40 | 526 | & INDIO_ALL_BUFFER_MODES)); |
7026ea4b | 527 | } |
14555b14 | 528 | EXPORT_SYMBOL(iio_buffer_show_enable); |
7026ea4b | 529 | |
14555b14 | 530 | int iio_sw_buffer_preenable(struct iio_dev *indio_dev) |
5565a450 | 531 | { |
14555b14 | 532 | struct iio_buffer *buffer = indio_dev->buffer; |
5565a450 JC |
533 | size_t size; |
534 | dev_dbg(&indio_dev->dev, "%s\n", __func__); | |
535 | /* Check if there are any scan elements enabled, if not fail*/ | |
14555b14 | 536 | if (!(buffer->scan_count || buffer->scan_timestamp)) |
5565a450 | 537 | return -EINVAL; |
14555b14 JC |
538 | if (buffer->scan_timestamp) |
539 | if (buffer->scan_count) | |
5565a450 | 540 | /* Timestamp (aligned to s64) and data */ |
14555b14 | 541 | size = (((buffer->scan_count * buffer->bpe) |
5565a450 JC |
542 | + sizeof(s64) - 1) |
543 | & ~(sizeof(s64) - 1)) | |
544 | + sizeof(s64); | |
545 | else /* Timestamp only */ | |
546 | size = sizeof(s64); | |
547 | else /* Data only */ | |
14555b14 JC |
548 | size = buffer->scan_count * buffer->bpe; |
549 | buffer->access->set_bytes_per_datum(buffer, size); | |
5565a450 JC |
550 | |
551 | return 0; | |
552 | } | |
14555b14 | 553 | EXPORT_SYMBOL(iio_sw_buffer_preenable); |
32b5eeca JC |
554 | |
555 | ||
556 | /* note NULL used as error indicator as it doesn't make sense. */ | |
557 | static unsigned long *iio_scan_mask_match(unsigned long *av_masks, | |
558 | unsigned int masklength, | |
559 | unsigned long *mask) | |
560 | { | |
561 | if (bitmap_empty(mask, masklength)) | |
562 | return NULL; | |
563 | while (*av_masks) { | |
564 | if (bitmap_subset(mask, av_masks, masklength)) | |
565 | return av_masks; | |
566 | av_masks += BITS_TO_LONGS(masklength); | |
567 | } | |
568 | return NULL; | |
569 | } | |
570 | ||
571 | /** | |
572 | * iio_scan_mask_set() - set particular bit in the scan mask | |
14555b14 | 573 | * @buffer: the buffer whose scan mask we are interested in |
32b5eeca JC |
574 | * @bit: the bit to be set. |
575 | **/ | |
14555b14 | 576 | int iio_scan_mask_set(struct iio_buffer *buffer, int bit) |
32b5eeca | 577 | { |
14555b14 | 578 | struct iio_dev *dev_info = buffer->indio_dev; |
32b5eeca JC |
579 | unsigned long *mask; |
580 | unsigned long *trialmask; | |
581 | ||
582 | trialmask = kmalloc(sizeof(*trialmask)* | |
583 | BITS_TO_LONGS(dev_info->masklength), | |
584 | GFP_KERNEL); | |
585 | ||
586 | if (trialmask == NULL) | |
587 | return -ENOMEM; | |
588 | if (!dev_info->masklength) { | |
14555b14 | 589 | WARN_ON("trying to set scanmask prior to registering buffer\n"); |
32b5eeca JC |
590 | kfree(trialmask); |
591 | return -EINVAL; | |
592 | } | |
14555b14 | 593 | bitmap_copy(trialmask, buffer->scan_mask, dev_info->masklength); |
32b5eeca JC |
594 | set_bit(bit, trialmask); |
595 | ||
596 | if (dev_info->available_scan_masks) { | |
597 | mask = iio_scan_mask_match(dev_info->available_scan_masks, | |
598 | dev_info->masklength, | |
599 | trialmask); | |
600 | if (!mask) { | |
601 | kfree(trialmask); | |
602 | return -EINVAL; | |
603 | } | |
604 | } | |
14555b14 JC |
605 | bitmap_copy(buffer->scan_mask, trialmask, dev_info->masklength); |
606 | buffer->scan_count++; | |
32b5eeca JC |
607 | |
608 | kfree(trialmask); | |
609 | ||
610 | return 0; | |
611 | }; | |
612 | EXPORT_SYMBOL_GPL(iio_scan_mask_set); | |
613 | ||
14555b14 | 614 | int iio_scan_mask_query(struct iio_buffer *buffer, int bit) |
32b5eeca | 615 | { |
14555b14 | 616 | struct iio_dev *dev_info = buffer->indio_dev; |
32b5eeca JC |
617 | long *mask; |
618 | ||
619 | if (bit > dev_info->masklength) | |
620 | return -EINVAL; | |
621 | ||
14555b14 | 622 | if (!buffer->scan_mask) |
32b5eeca JC |
623 | return 0; |
624 | if (dev_info->available_scan_masks) | |
625 | mask = iio_scan_mask_match(dev_info->available_scan_masks, | |
626 | dev_info->masklength, | |
14555b14 | 627 | buffer->scan_mask); |
32b5eeca | 628 | else |
14555b14 | 629 | mask = buffer->scan_mask; |
32b5eeca JC |
630 | if (!mask) |
631 | return 0; | |
632 | ||
633 | return test_bit(bit, mask); | |
634 | }; | |
635 | EXPORT_SYMBOL_GPL(iio_scan_mask_query); |