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> |
7026ea4b | 23 | |
06458e27 | 24 | #include <linux/iio/iio.h> |
df9c1c42 | 25 | #include "iio_core.h" |
06458e27 JC |
26 | #include <linux/iio/sysfs.h> |
27 | #include <linux/iio/buffer.h> | |
7026ea4b | 28 | |
8310b86c JC |
29 | static const char * const iio_endian_prefix[] = { |
30 | [IIO_BE] = "be", | |
31 | [IIO_LE] = "le", | |
32 | }; | |
7026ea4b | 33 | |
84b36ce5 JC |
34 | static bool iio_buffer_is_active(struct iio_dev *indio_dev, |
35 | struct iio_buffer *buf) | |
36 | { | |
37 | struct list_head *p; | |
38 | ||
39 | list_for_each(p, &indio_dev->buffer_list) | |
40 | if (p == &buf->buffer_list) | |
41 | return true; | |
42 | ||
43 | return false; | |
44 | } | |
45 | ||
7026ea4b | 46 | /** |
14555b14 | 47 | * iio_buffer_read_first_n_outer() - chrdev read for buffer access |
7026ea4b | 48 | * |
14555b14 JC |
49 | * This function relies on all buffer implementations having an |
50 | * iio_buffer as their first element. | |
7026ea4b | 51 | **/ |
14555b14 JC |
52 | ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf, |
53 | size_t n, loff_t *f_ps) | |
7026ea4b | 54 | { |
1aa04278 | 55 | struct iio_dev *indio_dev = filp->private_data; |
14555b14 | 56 | struct iio_buffer *rb = indio_dev->buffer; |
d5857d65 | 57 | |
96e00f11 | 58 | if (!rb || !rb->access->read_first_n) |
7026ea4b | 59 | return -EINVAL; |
8d213f24 | 60 | return rb->access->read_first_n(rb, n, buf); |
7026ea4b JC |
61 | } |
62 | ||
a7348347 | 63 | /** |
14555b14 | 64 | * iio_buffer_poll() - poll the buffer to find out if it has data |
a7348347 | 65 | */ |
14555b14 JC |
66 | unsigned int iio_buffer_poll(struct file *filp, |
67 | struct poll_table_struct *wait) | |
a7348347 | 68 | { |
1aa04278 | 69 | struct iio_dev *indio_dev = filp->private_data; |
14555b14 | 70 | struct iio_buffer *rb = indio_dev->buffer; |
a7348347 JC |
71 | |
72 | poll_wait(filp, &rb->pollq, wait); | |
73 | if (rb->stufftoread) | |
74 | return POLLIN | POLLRDNORM; | |
75 | /* need a way of knowing if there may be enough data... */ | |
8d213f24 | 76 | return 0; |
a7348347 JC |
77 | } |
78 | ||
f79a9098 | 79 | void iio_buffer_init(struct iio_buffer *buffer) |
7026ea4b | 80 | { |
5ada4ea9 | 81 | INIT_LIST_HEAD(&buffer->demux_list); |
14555b14 | 82 | init_waitqueue_head(&buffer->pollq); |
7026ea4b | 83 | } |
14555b14 | 84 | EXPORT_SYMBOL(iio_buffer_init); |
7026ea4b | 85 | |
1d892719 | 86 | static ssize_t iio_show_scan_index(struct device *dev, |
8d213f24 JC |
87 | struct device_attribute *attr, |
88 | char *buf) | |
1d892719 | 89 | { |
8d213f24 | 90 | return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index); |
1d892719 JC |
91 | } |
92 | ||
93 | static ssize_t iio_show_fixed_type(struct device *dev, | |
94 | struct device_attribute *attr, | |
95 | char *buf) | |
96 | { | |
97 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
8310b86c JC |
98 | u8 type = this_attr->c->scan_type.endianness; |
99 | ||
100 | if (type == IIO_CPU) { | |
9d5d1153 JC |
101 | #ifdef __LITTLE_ENDIAN |
102 | type = IIO_LE; | |
103 | #else | |
104 | type = IIO_BE; | |
105 | #endif | |
8310b86c JC |
106 | } |
107 | return sprintf(buf, "%s:%c%d/%d>>%u\n", | |
108 | iio_endian_prefix[type], | |
1d892719 JC |
109 | this_attr->c->scan_type.sign, |
110 | this_attr->c->scan_type.realbits, | |
111 | this_attr->c->scan_type.storagebits, | |
112 | this_attr->c->scan_type.shift); | |
113 | } | |
114 | ||
8d213f24 JC |
115 | static ssize_t iio_scan_el_show(struct device *dev, |
116 | struct device_attribute *attr, | |
117 | char *buf) | |
118 | { | |
119 | int ret; | |
e53f5ac5 | 120 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
8d213f24 | 121 | |
5ada4ea9 JC |
122 | ret = test_bit(to_iio_dev_attr(attr)->address, |
123 | indio_dev->buffer->scan_mask); | |
124 | ||
8d213f24 JC |
125 | return sprintf(buf, "%d\n", ret); |
126 | } | |
127 | ||
14555b14 | 128 | static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit) |
8d213f24 | 129 | { |
14555b14 | 130 | clear_bit(bit, buffer->scan_mask); |
8d213f24 JC |
131 | return 0; |
132 | } | |
133 | ||
134 | static ssize_t iio_scan_el_store(struct device *dev, | |
135 | struct device_attribute *attr, | |
136 | const char *buf, | |
137 | size_t len) | |
138 | { | |
a714af27 | 139 | int ret; |
8d213f24 | 140 | bool state; |
e53f5ac5 | 141 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 142 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 JC |
143 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
144 | ||
a714af27 JC |
145 | ret = strtobool(buf, &state); |
146 | if (ret < 0) | |
147 | return ret; | |
8d213f24 | 148 | mutex_lock(&indio_dev->mlock); |
84b36ce5 | 149 | if (iio_buffer_is_active(indio_dev, indio_dev->buffer)) { |
8d213f24 JC |
150 | ret = -EBUSY; |
151 | goto error_ret; | |
152 | } | |
f79a9098 | 153 | ret = iio_scan_mask_query(indio_dev, buffer, this_attr->address); |
8d213f24 JC |
154 | if (ret < 0) |
155 | goto error_ret; | |
156 | if (!state && ret) { | |
14555b14 | 157 | ret = iio_scan_mask_clear(buffer, this_attr->address); |
8d213f24 JC |
158 | if (ret) |
159 | goto error_ret; | |
160 | } else if (state && !ret) { | |
f79a9098 | 161 | ret = iio_scan_mask_set(indio_dev, buffer, this_attr->address); |
8d213f24 JC |
162 | if (ret) |
163 | goto error_ret; | |
164 | } | |
165 | ||
166 | error_ret: | |
167 | mutex_unlock(&indio_dev->mlock); | |
168 | ||
5a2a6e11 | 169 | return ret < 0 ? ret : len; |
8d213f24 JC |
170 | |
171 | } | |
172 | ||
173 | static ssize_t iio_scan_el_ts_show(struct device *dev, | |
174 | struct device_attribute *attr, | |
175 | char *buf) | |
176 | { | |
e53f5ac5 | 177 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
f8c6f4e9 | 178 | return sprintf(buf, "%d\n", indio_dev->buffer->scan_timestamp); |
8d213f24 JC |
179 | } |
180 | ||
181 | static ssize_t iio_scan_el_ts_store(struct device *dev, | |
182 | struct device_attribute *attr, | |
183 | const char *buf, | |
184 | size_t len) | |
185 | { | |
a714af27 | 186 | int ret; |
e53f5ac5 | 187 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
8d213f24 | 188 | bool state; |
1aa04278 | 189 | |
a714af27 JC |
190 | ret = strtobool(buf, &state); |
191 | if (ret < 0) | |
192 | return ret; | |
193 | ||
8d213f24 | 194 | mutex_lock(&indio_dev->mlock); |
84b36ce5 | 195 | if (iio_buffer_is_active(indio_dev, indio_dev->buffer)) { |
8d213f24 JC |
196 | ret = -EBUSY; |
197 | goto error_ret; | |
198 | } | |
14555b14 | 199 | indio_dev->buffer->scan_timestamp = state; |
8d213f24 JC |
200 | error_ret: |
201 | mutex_unlock(&indio_dev->mlock); | |
202 | ||
203 | return ret ? ret : len; | |
204 | } | |
205 | ||
14555b14 JC |
206 | static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev, |
207 | const struct iio_chan_spec *chan) | |
1d892719 | 208 | { |
26d25ae3 | 209 | int ret, attrcount = 0; |
14555b14 | 210 | struct iio_buffer *buffer = indio_dev->buffer; |
1d892719 | 211 | |
26d25ae3 | 212 | ret = __iio_add_chan_devattr("index", |
1d892719 JC |
213 | chan, |
214 | &iio_show_scan_index, | |
215 | NULL, | |
216 | 0, | |
217 | 0, | |
1aa04278 | 218 | &indio_dev->dev, |
14555b14 | 219 | &buffer->scan_el_dev_attr_list); |
1d892719 JC |
220 | if (ret) |
221 | goto error_ret; | |
26d25ae3 JC |
222 | attrcount++; |
223 | ret = __iio_add_chan_devattr("type", | |
1d892719 JC |
224 | chan, |
225 | &iio_show_fixed_type, | |
226 | NULL, | |
227 | 0, | |
228 | 0, | |
1aa04278 | 229 | &indio_dev->dev, |
14555b14 | 230 | &buffer->scan_el_dev_attr_list); |
1d892719 JC |
231 | if (ret) |
232 | goto error_ret; | |
26d25ae3 | 233 | attrcount++; |
a88b3ebc | 234 | if (chan->type != IIO_TIMESTAMP) |
26d25ae3 | 235 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
236 | chan, |
237 | &iio_scan_el_show, | |
238 | &iio_scan_el_store, | |
239 | chan->scan_index, | |
240 | 0, | |
1aa04278 | 241 | &indio_dev->dev, |
14555b14 | 242 | &buffer->scan_el_dev_attr_list); |
a88b3ebc | 243 | else |
26d25ae3 | 244 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
245 | chan, |
246 | &iio_scan_el_ts_show, | |
247 | &iio_scan_el_ts_store, | |
248 | chan->scan_index, | |
249 | 0, | |
1aa04278 | 250 | &indio_dev->dev, |
14555b14 | 251 | &buffer->scan_el_dev_attr_list); |
26d25ae3 JC |
252 | attrcount++; |
253 | ret = attrcount; | |
1d892719 JC |
254 | error_ret: |
255 | return ret; | |
256 | } | |
257 | ||
14555b14 JC |
258 | static void iio_buffer_remove_and_free_scan_dev_attr(struct iio_dev *indio_dev, |
259 | struct iio_dev_attr *p) | |
1d892719 | 260 | { |
1d892719 JC |
261 | kfree(p->dev_attr.attr.name); |
262 | kfree(p); | |
263 | } | |
264 | ||
14555b14 | 265 | static void __iio_buffer_attr_cleanup(struct iio_dev *indio_dev) |
1d892719 JC |
266 | { |
267 | struct iio_dev_attr *p, *n; | |
14555b14 | 268 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 | 269 | |
1d892719 | 270 | list_for_each_entry_safe(p, n, |
14555b14 JC |
271 | &buffer->scan_el_dev_attr_list, l) |
272 | iio_buffer_remove_and_free_scan_dev_attr(indio_dev, p); | |
1d892719 JC |
273 | } |
274 | ||
26d25ae3 JC |
275 | static const char * const iio_scan_elements_group_name = "scan_elements"; |
276 | ||
14555b14 JC |
277 | int iio_buffer_register(struct iio_dev *indio_dev, |
278 | const struct iio_chan_spec *channels, | |
279 | int num_channels) | |
1d892719 | 280 | { |
26d25ae3 JC |
281 | struct iio_dev_attr *p; |
282 | struct attribute **attr; | |
14555b14 | 283 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 JC |
284 | int ret, i, attrn, attrcount, attrcount_orig = 0; |
285 | ||
14555b14 JC |
286 | if (buffer->attrs) |
287 | indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs; | |
bf32963c | 288 | |
14555b14 JC |
289 | if (buffer->scan_el_attrs != NULL) { |
290 | attr = buffer->scan_el_attrs->attrs; | |
26d25ae3 JC |
291 | while (*attr++ != NULL) |
292 | attrcount_orig++; | |
293 | } | |
294 | attrcount = attrcount_orig; | |
14555b14 | 295 | INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list); |
1d892719 JC |
296 | if (channels) { |
297 | /* new magic */ | |
298 | for (i = 0; i < num_channels; i++) { | |
f5b81ddd LPC |
299 | if (channels[i].scan_index < 0) |
300 | continue; | |
301 | ||
32b5eeca JC |
302 | /* Establish necessary mask length */ |
303 | if (channels[i].scan_index > | |
304 | (int)indio_dev->masklength - 1) | |
305 | indio_dev->masklength | |
e1dc7bee | 306 | = channels[i].scan_index + 1; |
32b5eeca | 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; | |
beb80600 | 313 | if (channels[i].type == IIO_TIMESTAMP) |
f1264809 | 314 | indio_dev->scan_index_timestamp = |
beb80600 | 315 | channels[i].scan_index; |
1d892719 | 316 | } |
14555b14 | 317 | if (indio_dev->masklength && buffer->scan_mask == NULL) { |
d83fb184 TM |
318 | buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), |
319 | sizeof(*buffer->scan_mask), | |
320 | GFP_KERNEL); | |
14555b14 | 321 | if (buffer->scan_mask == NULL) { |
32b5eeca | 322 | ret = -ENOMEM; |
26d25ae3 | 323 | goto error_cleanup_dynamic; |
32b5eeca JC |
324 | } |
325 | } | |
1d892719 JC |
326 | } |
327 | ||
14555b14 | 328 | buffer->scan_el_group.name = iio_scan_elements_group_name; |
26d25ae3 | 329 | |
d83fb184 TM |
330 | buffer->scan_el_group.attrs = kcalloc(attrcount + 1, |
331 | sizeof(buffer->scan_el_group.attrs[0]), | |
332 | GFP_KERNEL); | |
14555b14 | 333 | if (buffer->scan_el_group.attrs == NULL) { |
26d25ae3 JC |
334 | ret = -ENOMEM; |
335 | goto error_free_scan_mask; | |
336 | } | |
14555b14 JC |
337 | if (buffer->scan_el_attrs) |
338 | memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs, | |
339 | sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig); | |
26d25ae3 JC |
340 | attrn = attrcount_orig; |
341 | ||
14555b14 JC |
342 | list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l) |
343 | buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr; | |
344 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group; | |
26d25ae3 | 345 | |
1d892719 | 346 | return 0; |
26d25ae3 JC |
347 | |
348 | error_free_scan_mask: | |
14555b14 | 349 | kfree(buffer->scan_mask); |
1d892719 | 350 | error_cleanup_dynamic: |
14555b14 | 351 | __iio_buffer_attr_cleanup(indio_dev); |
26d25ae3 | 352 | |
7026ea4b JC |
353 | return ret; |
354 | } | |
14555b14 | 355 | EXPORT_SYMBOL(iio_buffer_register); |
1d892719 | 356 | |
14555b14 | 357 | void iio_buffer_unregister(struct iio_dev *indio_dev) |
7026ea4b | 358 | { |
14555b14 JC |
359 | kfree(indio_dev->buffer->scan_mask); |
360 | kfree(indio_dev->buffer->scan_el_group.attrs); | |
361 | __iio_buffer_attr_cleanup(indio_dev); | |
7026ea4b | 362 | } |
14555b14 | 363 | EXPORT_SYMBOL(iio_buffer_unregister); |
7026ea4b | 364 | |
14555b14 JC |
365 | ssize_t iio_buffer_read_length(struct device *dev, |
366 | struct device_attribute *attr, | |
367 | char *buf) | |
7026ea4b | 368 | { |
e53f5ac5 | 369 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 370 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 371 | |
14555b14 | 372 | if (buffer->access->get_length) |
8d213f24 | 373 | return sprintf(buf, "%d\n", |
14555b14 | 374 | buffer->access->get_length(buffer)); |
7026ea4b | 375 | |
8d213f24 | 376 | return 0; |
7026ea4b | 377 | } |
14555b14 | 378 | EXPORT_SYMBOL(iio_buffer_read_length); |
7026ea4b | 379 | |
14555b14 JC |
380 | ssize_t iio_buffer_write_length(struct device *dev, |
381 | struct device_attribute *attr, | |
382 | const char *buf, | |
383 | size_t len) | |
7026ea4b | 384 | { |
e53f5ac5 | 385 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 386 | struct iio_buffer *buffer = indio_dev->buffer; |
948ad205 LPC |
387 | unsigned int val; |
388 | int ret; | |
8d213f24 | 389 | |
948ad205 | 390 | ret = kstrtouint(buf, 10, &val); |
7026ea4b JC |
391 | if (ret) |
392 | return ret; | |
393 | ||
14555b14 JC |
394 | if (buffer->access->get_length) |
395 | if (val == buffer->access->get_length(buffer)) | |
7026ea4b JC |
396 | return len; |
397 | ||
e38c79e0 | 398 | mutex_lock(&indio_dev->mlock); |
84b36ce5 | 399 | if (iio_buffer_is_active(indio_dev, indio_dev->buffer)) { |
e38c79e0 LPC |
400 | ret = -EBUSY; |
401 | } else { | |
869871b5 | 402 | if (buffer->access->set_length) |
e38c79e0 | 403 | buffer->access->set_length(buffer, val); |
e38c79e0 | 404 | ret = 0; |
7026ea4b | 405 | } |
e38c79e0 | 406 | mutex_unlock(&indio_dev->mlock); |
7026ea4b | 407 | |
e38c79e0 | 408 | return ret ? ret : len; |
7026ea4b | 409 | } |
14555b14 | 410 | EXPORT_SYMBOL(iio_buffer_write_length); |
7026ea4b | 411 | |
14555b14 JC |
412 | ssize_t iio_buffer_show_enable(struct device *dev, |
413 | struct device_attribute *attr, | |
414 | char *buf) | |
7026ea4b | 415 | { |
e53f5ac5 | 416 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
84b36ce5 JC |
417 | return sprintf(buf, "%d\n", |
418 | iio_buffer_is_active(indio_dev, | |
419 | indio_dev->buffer)); | |
7026ea4b | 420 | } |
14555b14 | 421 | EXPORT_SYMBOL(iio_buffer_show_enable); |
7026ea4b | 422 | |
32b5eeca | 423 | /* note NULL used as error indicator as it doesn't make sense. */ |
cd4361c7 | 424 | static const unsigned long *iio_scan_mask_match(const unsigned long *av_masks, |
32b5eeca | 425 | unsigned int masklength, |
cd4361c7 | 426 | const unsigned long *mask) |
32b5eeca JC |
427 | { |
428 | if (bitmap_empty(mask, masklength)) | |
429 | return NULL; | |
430 | while (*av_masks) { | |
431 | if (bitmap_subset(mask, av_masks, masklength)) | |
432 | return av_masks; | |
433 | av_masks += BITS_TO_LONGS(masklength); | |
434 | } | |
435 | return NULL; | |
436 | } | |
437 | ||
6b3b58ed JC |
438 | static int iio_compute_scan_bytes(struct iio_dev *indio_dev, const long *mask, |
439 | bool timestamp) | |
959d2952 | 440 | { |
959d2952 JC |
441 | const struct iio_chan_spec *ch; |
442 | unsigned bytes = 0; | |
443 | int length, i; | |
959d2952 JC |
444 | |
445 | /* How much space will the demuxed element take? */ | |
6b3b58ed | 446 | for_each_set_bit(i, mask, |
959d2952 JC |
447 | indio_dev->masklength) { |
448 | ch = iio_find_channel_from_si(indio_dev, i); | |
6b3b58ed | 449 | length = ch->scan_type.storagebits / 8; |
959d2952 JC |
450 | bytes = ALIGN(bytes, length); |
451 | bytes += length; | |
452 | } | |
6b3b58ed | 453 | if (timestamp) { |
959d2952 | 454 | ch = iio_find_channel_from_si(indio_dev, |
f1264809 | 455 | indio_dev->scan_index_timestamp); |
6b3b58ed | 456 | length = ch->scan_type.storagebits / 8; |
959d2952 JC |
457 | bytes = ALIGN(bytes, length); |
458 | bytes += length; | |
459 | } | |
6b3b58ed JC |
460 | return bytes; |
461 | } | |
462 | ||
a87c82e4 LPC |
463 | void iio_disable_all_buffers(struct iio_dev *indio_dev) |
464 | { | |
465 | struct iio_buffer *buffer, *_buffer; | |
466 | ||
467 | if (list_empty(&indio_dev->buffer_list)) | |
468 | return; | |
469 | ||
470 | if (indio_dev->setup_ops->predisable) | |
471 | indio_dev->setup_ops->predisable(indio_dev); | |
472 | ||
473 | list_for_each_entry_safe(buffer, _buffer, | |
474 | &indio_dev->buffer_list, buffer_list) | |
475 | list_del_init(&buffer->buffer_list); | |
476 | ||
477 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
478 | if (indio_dev->setup_ops->postdisable) | |
479 | indio_dev->setup_ops->postdisable(indio_dev); | |
e086ed76 LPC |
480 | |
481 | if (indio_dev->available_scan_masks == NULL) | |
482 | kfree(indio_dev->active_scan_mask); | |
a87c82e4 LPC |
483 | } |
484 | ||
84b36ce5 JC |
485 | int iio_update_buffers(struct iio_dev *indio_dev, |
486 | struct iio_buffer *insert_buffer, | |
487 | struct iio_buffer *remove_buffer) | |
6b3b58ed | 488 | { |
84b36ce5 JC |
489 | int ret; |
490 | int success = 0; | |
491 | struct iio_buffer *buffer; | |
492 | unsigned long *compound_mask; | |
493 | const unsigned long *old_mask; | |
6b3b58ed | 494 | |
84b36ce5 JC |
495 | /* Wind down existing buffers - iff there are any */ |
496 | if (!list_empty(&indio_dev->buffer_list)) { | |
497 | if (indio_dev->setup_ops->predisable) { | |
498 | ret = indio_dev->setup_ops->predisable(indio_dev); | |
499 | if (ret) | |
500 | goto error_ret; | |
501 | } | |
502 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
503 | if (indio_dev->setup_ops->postdisable) { | |
504 | ret = indio_dev->setup_ops->postdisable(indio_dev); | |
505 | if (ret) | |
506 | goto error_ret; | |
507 | } | |
508 | } | |
509 | /* Keep a copy of current setup to allow roll back */ | |
510 | old_mask = indio_dev->active_scan_mask; | |
511 | if (!indio_dev->available_scan_masks) | |
512 | indio_dev->active_scan_mask = NULL; | |
513 | ||
514 | if (remove_buffer) | |
515 | list_del(&remove_buffer->buffer_list); | |
516 | if (insert_buffer) | |
517 | list_add(&insert_buffer->buffer_list, &indio_dev->buffer_list); | |
518 | ||
519 | /* If no buffers in list, we are done */ | |
520 | if (list_empty(&indio_dev->buffer_list)) { | |
521 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
522 | if (indio_dev->available_scan_masks == NULL) | |
523 | kfree(old_mask); | |
524 | return 0; | |
525 | } | |
959d2952 JC |
526 | |
527 | /* What scan mask do we actually have ?*/ | |
84b36ce5 JC |
528 | compound_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), |
529 | sizeof(long), GFP_KERNEL); | |
530 | if (compound_mask == NULL) { | |
531 | if (indio_dev->available_scan_masks == NULL) | |
532 | kfree(old_mask); | |
533 | return -ENOMEM; | |
534 | } | |
535 | indio_dev->scan_timestamp = 0; | |
536 | ||
537 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { | |
538 | bitmap_or(compound_mask, compound_mask, buffer->scan_mask, | |
539 | indio_dev->masklength); | |
540 | indio_dev->scan_timestamp |= buffer->scan_timestamp; | |
541 | } | |
542 | if (indio_dev->available_scan_masks) { | |
959d2952 JC |
543 | indio_dev->active_scan_mask = |
544 | iio_scan_mask_match(indio_dev->available_scan_masks, | |
545 | indio_dev->masklength, | |
84b36ce5 JC |
546 | compound_mask); |
547 | if (indio_dev->active_scan_mask == NULL) { | |
548 | /* | |
549 | * Roll back. | |
550 | * Note can only occur when adding a buffer. | |
551 | */ | |
552 | list_del(&insert_buffer->buffer_list); | |
d66e0452 PM |
553 | if (old_mask) { |
554 | indio_dev->active_scan_mask = old_mask; | |
555 | success = -EINVAL; | |
556 | } | |
557 | else { | |
558 | kfree(compound_mask); | |
559 | ret = -EINVAL; | |
560 | goto error_ret; | |
561 | } | |
84b36ce5 JC |
562 | } |
563 | } else { | |
564 | indio_dev->active_scan_mask = compound_mask; | |
565 | } | |
aff1eb4e | 566 | |
5ada4ea9 JC |
567 | iio_update_demux(indio_dev); |
568 | ||
84b36ce5 JC |
569 | /* Wind up again */ |
570 | if (indio_dev->setup_ops->preenable) { | |
571 | ret = indio_dev->setup_ops->preenable(indio_dev); | |
572 | if (ret) { | |
573 | printk(KERN_ERR | |
bec1889d | 574 | "Buffer not started: buffer preenable failed (%d)\n", ret); |
84b36ce5 JC |
575 | goto error_remove_inserted; |
576 | } | |
577 | } | |
578 | indio_dev->scan_bytes = | |
579 | iio_compute_scan_bytes(indio_dev, | |
580 | indio_dev->active_scan_mask, | |
581 | indio_dev->scan_timestamp); | |
582 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) | |
583 | if (buffer->access->request_update) { | |
584 | ret = buffer->access->request_update(buffer); | |
585 | if (ret) { | |
586 | printk(KERN_INFO | |
bec1889d | 587 | "Buffer not started: buffer parameter update failed (%d)\n", ret); |
84b36ce5 JC |
588 | goto error_run_postdisable; |
589 | } | |
590 | } | |
591 | if (indio_dev->info->update_scan_mode) { | |
592 | ret = indio_dev->info | |
5ada4ea9 JC |
593 | ->update_scan_mode(indio_dev, |
594 | indio_dev->active_scan_mask); | |
84b36ce5 | 595 | if (ret < 0) { |
bec1889d | 596 | printk(KERN_INFO "Buffer not started: update scan mode failed (%d)\n", ret); |
84b36ce5 JC |
597 | goto error_run_postdisable; |
598 | } | |
599 | } | |
600 | /* Definitely possible for devices to support both of these.*/ | |
601 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) { | |
602 | if (!indio_dev->trig) { | |
603 | printk(KERN_INFO "Buffer not started: no trigger\n"); | |
604 | ret = -EINVAL; | |
605 | /* Can only occur on first buffer */ | |
606 | goto error_run_postdisable; | |
607 | } | |
608 | indio_dev->currentmode = INDIO_BUFFER_TRIGGERED; | |
609 | } else if (indio_dev->modes & INDIO_BUFFER_HARDWARE) { | |
610 | indio_dev->currentmode = INDIO_BUFFER_HARDWARE; | |
611 | } else { /* should never be reached */ | |
612 | ret = -EINVAL; | |
613 | goto error_run_postdisable; | |
614 | } | |
615 | ||
616 | if (indio_dev->setup_ops->postenable) { | |
617 | ret = indio_dev->setup_ops->postenable(indio_dev); | |
618 | if (ret) { | |
619 | printk(KERN_INFO | |
bec1889d | 620 | "Buffer not started: postenable failed (%d)\n", ret); |
84b36ce5 JC |
621 | indio_dev->currentmode = INDIO_DIRECT_MODE; |
622 | if (indio_dev->setup_ops->postdisable) | |
623 | indio_dev->setup_ops->postdisable(indio_dev); | |
624 | goto error_disable_all_buffers; | |
625 | } | |
626 | } | |
627 | ||
628 | if (indio_dev->available_scan_masks) | |
629 | kfree(compound_mask); | |
630 | else | |
631 | kfree(old_mask); | |
632 | ||
633 | return success; | |
634 | ||
635 | error_disable_all_buffers: | |
636 | indio_dev->currentmode = INDIO_DIRECT_MODE; | |
637 | error_run_postdisable: | |
638 | if (indio_dev->setup_ops->postdisable) | |
639 | indio_dev->setup_ops->postdisable(indio_dev); | |
640 | error_remove_inserted: | |
641 | ||
642 | if (insert_buffer) | |
643 | list_del(&insert_buffer->buffer_list); | |
644 | indio_dev->active_scan_mask = old_mask; | |
645 | kfree(compound_mask); | |
646 | error_ret: | |
647 | ||
648 | return ret; | |
649 | } | |
650 | EXPORT_SYMBOL_GPL(iio_update_buffers); | |
651 | ||
652 | ssize_t iio_buffer_store_enable(struct device *dev, | |
653 | struct device_attribute *attr, | |
654 | const char *buf, | |
655 | size_t len) | |
656 | { | |
657 | int ret; | |
658 | bool requested_state; | |
659 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
660 | struct iio_buffer *pbuf = indio_dev->buffer; | |
661 | bool inlist; | |
662 | ||
663 | ret = strtobool(buf, &requested_state); | |
664 | if (ret < 0) | |
665 | return ret; | |
666 | ||
667 | mutex_lock(&indio_dev->mlock); | |
668 | ||
669 | /* Find out if it is in the list */ | |
670 | inlist = iio_buffer_is_active(indio_dev, pbuf); | |
671 | /* Already in desired state */ | |
672 | if (inlist == requested_state) | |
673 | goto done; | |
674 | ||
675 | if (requested_state) | |
676 | ret = iio_update_buffers(indio_dev, | |
677 | indio_dev->buffer, NULL); | |
678 | else | |
679 | ret = iio_update_buffers(indio_dev, | |
680 | NULL, indio_dev->buffer); | |
681 | ||
682 | if (ret < 0) | |
683 | goto done; | |
684 | done: | |
685 | mutex_unlock(&indio_dev->mlock); | |
686 | return (ret < 0) ? ret : len; | |
687 | } | |
688 | EXPORT_SYMBOL(iio_buffer_store_enable); | |
689 | ||
690 | int iio_sw_buffer_preenable(struct iio_dev *indio_dev) | |
691 | { | |
692 | struct iio_buffer *buffer; | |
693 | unsigned bytes; | |
694 | dev_dbg(&indio_dev->dev, "%s\n", __func__); | |
695 | ||
696 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) | |
697 | if (buffer->access->set_bytes_per_datum) { | |
698 | bytes = iio_compute_scan_bytes(indio_dev, | |
699 | buffer->scan_mask, | |
700 | buffer->scan_timestamp); | |
701 | ||
702 | buffer->access->set_bytes_per_datum(buffer, bytes); | |
703 | } | |
959d2952 JC |
704 | return 0; |
705 | } | |
706 | EXPORT_SYMBOL(iio_sw_buffer_preenable); | |
707 | ||
81636632 LPC |
708 | /** |
709 | * iio_validate_scan_mask_onehot() - Validates that exactly one channel is selected | |
710 | * @indio_dev: the iio device | |
711 | * @mask: scan mask to be checked | |
712 | * | |
713 | * Return true if exactly one bit is set in the scan mask, false otherwise. It | |
714 | * can be used for devices where only one channel can be active for sampling at | |
715 | * a time. | |
716 | */ | |
717 | bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev, | |
718 | const unsigned long *mask) | |
719 | { | |
720 | return bitmap_weight(mask, indio_dev->masklength) == 1; | |
721 | } | |
722 | EXPORT_SYMBOL_GPL(iio_validate_scan_mask_onehot); | |
723 | ||
939546d1 LPC |
724 | static bool iio_validate_scan_mask(struct iio_dev *indio_dev, |
725 | const unsigned long *mask) | |
726 | { | |
727 | if (!indio_dev->setup_ops->validate_scan_mask) | |
728 | return true; | |
729 | ||
730 | return indio_dev->setup_ops->validate_scan_mask(indio_dev, mask); | |
731 | } | |
732 | ||
32b5eeca JC |
733 | /** |
734 | * iio_scan_mask_set() - set particular bit in the scan mask | |
14555b14 | 735 | * @buffer: the buffer whose scan mask we are interested in |
32b5eeca | 736 | * @bit: the bit to be set. |
84b36ce5 JC |
737 | * |
738 | * Note that at this point we have no way of knowing what other | |
739 | * buffers might request, hence this code only verifies that the | |
740 | * individual buffers request is plausible. | |
741 | */ | |
f79a9098 JC |
742 | int iio_scan_mask_set(struct iio_dev *indio_dev, |
743 | struct iio_buffer *buffer, int bit) | |
32b5eeca | 744 | { |
cd4361c7 | 745 | const unsigned long *mask; |
32b5eeca JC |
746 | unsigned long *trialmask; |
747 | ||
748 | trialmask = kmalloc(sizeof(*trialmask)* | |
f8c6f4e9 | 749 | BITS_TO_LONGS(indio_dev->masklength), |
32b5eeca JC |
750 | GFP_KERNEL); |
751 | ||
752 | if (trialmask == NULL) | |
753 | return -ENOMEM; | |
f8c6f4e9 | 754 | if (!indio_dev->masklength) { |
14555b14 | 755 | WARN_ON("trying to set scanmask prior to registering buffer\n"); |
939546d1 | 756 | goto err_invalid_mask; |
32b5eeca | 757 | } |
f8c6f4e9 | 758 | bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength); |
32b5eeca JC |
759 | set_bit(bit, trialmask); |
760 | ||
939546d1 LPC |
761 | if (!iio_validate_scan_mask(indio_dev, trialmask)) |
762 | goto err_invalid_mask; | |
763 | ||
f8c6f4e9 JC |
764 | if (indio_dev->available_scan_masks) { |
765 | mask = iio_scan_mask_match(indio_dev->available_scan_masks, | |
766 | indio_dev->masklength, | |
32b5eeca | 767 | trialmask); |
939546d1 LPC |
768 | if (!mask) |
769 | goto err_invalid_mask; | |
32b5eeca | 770 | } |
f8c6f4e9 | 771 | bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength); |
32b5eeca JC |
772 | |
773 | kfree(trialmask); | |
774 | ||
775 | return 0; | |
939546d1 LPC |
776 | |
777 | err_invalid_mask: | |
778 | kfree(trialmask); | |
779 | return -EINVAL; | |
780 | } | |
32b5eeca JC |
781 | EXPORT_SYMBOL_GPL(iio_scan_mask_set); |
782 | ||
f79a9098 JC |
783 | int iio_scan_mask_query(struct iio_dev *indio_dev, |
784 | struct iio_buffer *buffer, int bit) | |
32b5eeca | 785 | { |
f8c6f4e9 | 786 | if (bit > indio_dev->masklength) |
32b5eeca JC |
787 | return -EINVAL; |
788 | ||
14555b14 | 789 | if (!buffer->scan_mask) |
32b5eeca | 790 | return 0; |
32b5eeca | 791 | |
5a2a6e11 | 792 | return test_bit(bit, buffer->scan_mask); |
32b5eeca JC |
793 | }; |
794 | EXPORT_SYMBOL_GPL(iio_scan_mask_query); | |
5ada4ea9 JC |
795 | |
796 | /** | |
797 | * struct iio_demux_table() - table describing demux memcpy ops | |
798 | * @from: index to copy from | |
99698b45 | 799 | * @to: index to copy to |
5ada4ea9 JC |
800 | * @length: how many bytes to copy |
801 | * @l: list head used for management | |
802 | */ | |
803 | struct iio_demux_table { | |
804 | unsigned from; | |
805 | unsigned to; | |
806 | unsigned length; | |
807 | struct list_head l; | |
808 | }; | |
809 | ||
810 | static unsigned char *iio_demux(struct iio_buffer *buffer, | |
811 | unsigned char *datain) | |
812 | { | |
813 | struct iio_demux_table *t; | |
814 | ||
815 | if (list_empty(&buffer->demux_list)) | |
816 | return datain; | |
817 | list_for_each_entry(t, &buffer->demux_list, l) | |
818 | memcpy(buffer->demux_bounce + t->to, | |
819 | datain + t->from, t->length); | |
820 | ||
821 | return buffer->demux_bounce; | |
822 | } | |
823 | ||
84b36ce5 | 824 | static int iio_push_to_buffer(struct iio_buffer *buffer, unsigned char *data) |
5ada4ea9 JC |
825 | { |
826 | unsigned char *dataout = iio_demux(buffer, data); | |
827 | ||
ce56ade6 | 828 | return buffer->access->store_to(buffer, dataout); |
5ada4ea9 | 829 | } |
5ada4ea9 | 830 | |
842cd100 JC |
831 | static void iio_buffer_demux_free(struct iio_buffer *buffer) |
832 | { | |
833 | struct iio_demux_table *p, *q; | |
834 | list_for_each_entry_safe(p, q, &buffer->demux_list, l) { | |
835 | list_del(&p->l); | |
836 | kfree(p); | |
837 | } | |
838 | } | |
839 | ||
84b36ce5 JC |
840 | |
841 | int iio_push_to_buffers(struct iio_dev *indio_dev, unsigned char *data) | |
842 | { | |
843 | int ret; | |
844 | struct iio_buffer *buf; | |
845 | ||
846 | list_for_each_entry(buf, &indio_dev->buffer_list, buffer_list) { | |
847 | ret = iio_push_to_buffer(buf, data); | |
848 | if (ret < 0) | |
849 | return ret; | |
850 | } | |
851 | ||
852 | return 0; | |
853 | } | |
854 | EXPORT_SYMBOL_GPL(iio_push_to_buffers); | |
855 | ||
856 | static int iio_buffer_update_demux(struct iio_dev *indio_dev, | |
857 | struct iio_buffer *buffer) | |
5ada4ea9 JC |
858 | { |
859 | const struct iio_chan_spec *ch; | |
5ada4ea9 JC |
860 | int ret, in_ind = -1, out_ind, length; |
861 | unsigned in_loc = 0, out_loc = 0; | |
842cd100 | 862 | struct iio_demux_table *p; |
5ada4ea9 JC |
863 | |
864 | /* Clear out any old demux */ | |
842cd100 | 865 | iio_buffer_demux_free(buffer); |
5ada4ea9 JC |
866 | kfree(buffer->demux_bounce); |
867 | buffer->demux_bounce = NULL; | |
868 | ||
869 | /* First work out which scan mode we will actually have */ | |
870 | if (bitmap_equal(indio_dev->active_scan_mask, | |
871 | buffer->scan_mask, | |
872 | indio_dev->masklength)) | |
873 | return 0; | |
874 | ||
875 | /* Now we have the two masks, work from least sig and build up sizes */ | |
876 | for_each_set_bit(out_ind, | |
877 | indio_dev->active_scan_mask, | |
878 | indio_dev->masklength) { | |
879 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
880 | indio_dev->masklength, | |
881 | in_ind + 1); | |
882 | while (in_ind != out_ind) { | |
883 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
884 | indio_dev->masklength, | |
885 | in_ind + 1); | |
886 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
887 | length = ch->scan_type.storagebits/8; | |
888 | /* Make sure we are aligned */ | |
889 | in_loc += length; | |
890 | if (in_loc % length) | |
891 | in_loc += length - in_loc % length; | |
892 | } | |
893 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
894 | if (p == NULL) { | |
895 | ret = -ENOMEM; | |
896 | goto error_clear_mux_table; | |
897 | } | |
898 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
899 | length = ch->scan_type.storagebits/8; | |
900 | if (out_loc % length) | |
901 | out_loc += length - out_loc % length; | |
902 | if (in_loc % length) | |
903 | in_loc += length - in_loc % length; | |
904 | p->from = in_loc; | |
905 | p->to = out_loc; | |
906 | p->length = length; | |
907 | list_add_tail(&p->l, &buffer->demux_list); | |
908 | out_loc += length; | |
909 | in_loc += length; | |
910 | } | |
911 | /* Relies on scan_timestamp being last */ | |
912 | if (buffer->scan_timestamp) { | |
913 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
914 | if (p == NULL) { | |
915 | ret = -ENOMEM; | |
916 | goto error_clear_mux_table; | |
917 | } | |
918 | ch = iio_find_channel_from_si(indio_dev, | |
f1264809 | 919 | indio_dev->scan_index_timestamp); |
5ada4ea9 JC |
920 | length = ch->scan_type.storagebits/8; |
921 | if (out_loc % length) | |
922 | out_loc += length - out_loc % length; | |
923 | if (in_loc % length) | |
924 | in_loc += length - in_loc % length; | |
925 | p->from = in_loc; | |
926 | p->to = out_loc; | |
927 | p->length = length; | |
928 | list_add_tail(&p->l, &buffer->demux_list); | |
929 | out_loc += length; | |
930 | in_loc += length; | |
931 | } | |
932 | buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL); | |
933 | if (buffer->demux_bounce == NULL) { | |
934 | ret = -ENOMEM; | |
935 | goto error_clear_mux_table; | |
936 | } | |
937 | return 0; | |
938 | ||
939 | error_clear_mux_table: | |
842cd100 JC |
940 | iio_buffer_demux_free(buffer); |
941 | ||
5ada4ea9 JC |
942 | return ret; |
943 | } | |
84b36ce5 JC |
944 | |
945 | int iio_update_demux(struct iio_dev *indio_dev) | |
946 | { | |
947 | struct iio_buffer *buffer; | |
948 | int ret; | |
949 | ||
950 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { | |
951 | ret = iio_buffer_update_demux(indio_dev, buffer); | |
952 | if (ret < 0) | |
953 | goto error_clear_mux_table; | |
954 | } | |
955 | return 0; | |
956 | ||
957 | error_clear_mux_table: | |
958 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) | |
959 | iio_buffer_demux_free(buffer); | |
960 | ||
961 | return ret; | |
962 | } | |
5ada4ea9 | 963 | EXPORT_SYMBOL_GPL(iio_update_demux); |