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 JC |
23 | |
24 | #include "iio.h" | |
df9c1c42 | 25 | #include "iio_core.h" |
9dd1cb30 | 26 | #include "sysfs.h" |
af5046af | 27 | #include "buffer.h" |
7026ea4b | 28 | |
8310b86c JC |
29 | static const char * const iio_endian_prefix[] = { |
30 | [IIO_BE] = "be", | |
31 | [IIO_LE] = "le", | |
32 | }; | |
7026ea4b JC |
33 | |
34 | /** | |
14555b14 | 35 | * iio_buffer_read_first_n_outer() - chrdev read for buffer access |
7026ea4b | 36 | * |
14555b14 JC |
37 | * This function relies on all buffer implementations having an |
38 | * iio_buffer as their first element. | |
7026ea4b | 39 | **/ |
14555b14 JC |
40 | ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf, |
41 | size_t n, loff_t *f_ps) | |
7026ea4b | 42 | { |
1aa04278 | 43 | struct iio_dev *indio_dev = filp->private_data; |
14555b14 | 44 | struct iio_buffer *rb = indio_dev->buffer; |
d5857d65 | 45 | |
96e00f11 | 46 | if (!rb || !rb->access->read_first_n) |
7026ea4b | 47 | return -EINVAL; |
8d213f24 | 48 | return rb->access->read_first_n(rb, n, buf); |
7026ea4b JC |
49 | } |
50 | ||
a7348347 | 51 | /** |
14555b14 | 52 | * iio_buffer_poll() - poll the buffer to find out if it has data |
a7348347 | 53 | */ |
14555b14 JC |
54 | unsigned int iio_buffer_poll(struct file *filp, |
55 | struct poll_table_struct *wait) | |
a7348347 | 56 | { |
1aa04278 | 57 | struct iio_dev *indio_dev = filp->private_data; |
14555b14 | 58 | struct iio_buffer *rb = indio_dev->buffer; |
a7348347 JC |
59 | |
60 | poll_wait(filp, &rb->pollq, wait); | |
61 | if (rb->stufftoread) | |
62 | return POLLIN | POLLRDNORM; | |
63 | /* need a way of knowing if there may be enough data... */ | |
8d213f24 | 64 | return 0; |
a7348347 JC |
65 | } |
66 | ||
f79a9098 | 67 | void iio_buffer_init(struct iio_buffer *buffer) |
7026ea4b | 68 | { |
5ada4ea9 | 69 | INIT_LIST_HEAD(&buffer->demux_list); |
14555b14 | 70 | init_waitqueue_head(&buffer->pollq); |
7026ea4b | 71 | } |
14555b14 | 72 | EXPORT_SYMBOL(iio_buffer_init); |
7026ea4b | 73 | |
1d892719 | 74 | static ssize_t iio_show_scan_index(struct device *dev, |
8d213f24 JC |
75 | struct device_attribute *attr, |
76 | char *buf) | |
1d892719 | 77 | { |
8d213f24 | 78 | return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index); |
1d892719 JC |
79 | } |
80 | ||
81 | static ssize_t iio_show_fixed_type(struct device *dev, | |
82 | struct device_attribute *attr, | |
83 | char *buf) | |
84 | { | |
85 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
8310b86c JC |
86 | u8 type = this_attr->c->scan_type.endianness; |
87 | ||
88 | if (type == IIO_CPU) { | |
9d5d1153 JC |
89 | #ifdef __LITTLE_ENDIAN |
90 | type = IIO_LE; | |
91 | #else | |
92 | type = IIO_BE; | |
93 | #endif | |
8310b86c JC |
94 | } |
95 | return sprintf(buf, "%s:%c%d/%d>>%u\n", | |
96 | iio_endian_prefix[type], | |
1d892719 JC |
97 | this_attr->c->scan_type.sign, |
98 | this_attr->c->scan_type.realbits, | |
99 | this_attr->c->scan_type.storagebits, | |
100 | this_attr->c->scan_type.shift); | |
101 | } | |
102 | ||
8d213f24 JC |
103 | static ssize_t iio_scan_el_show(struct device *dev, |
104 | struct device_attribute *attr, | |
105 | char *buf) | |
106 | { | |
107 | int ret; | |
f8c6f4e9 | 108 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
8d213f24 | 109 | |
5ada4ea9 JC |
110 | ret = test_bit(to_iio_dev_attr(attr)->address, |
111 | indio_dev->buffer->scan_mask); | |
112 | ||
8d213f24 JC |
113 | return sprintf(buf, "%d\n", ret); |
114 | } | |
115 | ||
14555b14 | 116 | static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit) |
8d213f24 | 117 | { |
14555b14 | 118 | clear_bit(bit, buffer->scan_mask); |
8d213f24 JC |
119 | return 0; |
120 | } | |
121 | ||
122 | static ssize_t iio_scan_el_store(struct device *dev, | |
123 | struct device_attribute *attr, | |
124 | const char *buf, | |
125 | size_t len) | |
126 | { | |
a714af27 | 127 | int ret; |
8d213f24 | 128 | bool state; |
1aa04278 | 129 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 130 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 JC |
131 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
132 | ||
a714af27 JC |
133 | ret = strtobool(buf, &state); |
134 | if (ret < 0) | |
135 | return ret; | |
8d213f24 | 136 | mutex_lock(&indio_dev->mlock); |
5fd6218c | 137 | if (iio_buffer_enabled(indio_dev)) { |
8d213f24 JC |
138 | ret = -EBUSY; |
139 | goto error_ret; | |
140 | } | |
f79a9098 | 141 | ret = iio_scan_mask_query(indio_dev, buffer, this_attr->address); |
8d213f24 JC |
142 | if (ret < 0) |
143 | goto error_ret; | |
144 | if (!state && ret) { | |
14555b14 | 145 | ret = iio_scan_mask_clear(buffer, this_attr->address); |
8d213f24 JC |
146 | if (ret) |
147 | goto error_ret; | |
148 | } else if (state && !ret) { | |
f79a9098 | 149 | ret = iio_scan_mask_set(indio_dev, buffer, this_attr->address); |
8d213f24 JC |
150 | if (ret) |
151 | goto error_ret; | |
152 | } | |
153 | ||
154 | error_ret: | |
155 | mutex_unlock(&indio_dev->mlock); | |
156 | ||
5a2a6e11 | 157 | return ret < 0 ? ret : len; |
8d213f24 JC |
158 | |
159 | } | |
160 | ||
161 | static ssize_t iio_scan_el_ts_show(struct device *dev, | |
162 | struct device_attribute *attr, | |
163 | char *buf) | |
164 | { | |
f8c6f4e9 JC |
165 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
166 | return sprintf(buf, "%d\n", indio_dev->buffer->scan_timestamp); | |
8d213f24 JC |
167 | } |
168 | ||
169 | static ssize_t iio_scan_el_ts_store(struct device *dev, | |
170 | struct device_attribute *attr, | |
171 | const char *buf, | |
172 | size_t len) | |
173 | { | |
a714af27 | 174 | int ret; |
1aa04278 | 175 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
8d213f24 | 176 | bool state; |
1aa04278 | 177 | |
a714af27 JC |
178 | ret = strtobool(buf, &state); |
179 | if (ret < 0) | |
180 | return ret; | |
181 | ||
8d213f24 | 182 | mutex_lock(&indio_dev->mlock); |
5fd6218c | 183 | if (iio_buffer_enabled(indio_dev)) { |
8d213f24 JC |
184 | ret = -EBUSY; |
185 | goto error_ret; | |
186 | } | |
14555b14 | 187 | indio_dev->buffer->scan_timestamp = state; |
8d213f24 JC |
188 | error_ret: |
189 | mutex_unlock(&indio_dev->mlock); | |
190 | ||
191 | return ret ? ret : len; | |
192 | } | |
193 | ||
14555b14 JC |
194 | static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev, |
195 | const struct iio_chan_spec *chan) | |
1d892719 | 196 | { |
26d25ae3 | 197 | int ret, attrcount = 0; |
14555b14 | 198 | struct iio_buffer *buffer = indio_dev->buffer; |
1d892719 | 199 | |
26d25ae3 | 200 | ret = __iio_add_chan_devattr("index", |
1d892719 JC |
201 | chan, |
202 | &iio_show_scan_index, | |
203 | NULL, | |
204 | 0, | |
205 | 0, | |
1aa04278 | 206 | &indio_dev->dev, |
14555b14 | 207 | &buffer->scan_el_dev_attr_list); |
1d892719 JC |
208 | if (ret) |
209 | goto error_ret; | |
26d25ae3 JC |
210 | attrcount++; |
211 | ret = __iio_add_chan_devattr("type", | |
1d892719 JC |
212 | chan, |
213 | &iio_show_fixed_type, | |
214 | NULL, | |
215 | 0, | |
216 | 0, | |
1aa04278 | 217 | &indio_dev->dev, |
14555b14 | 218 | &buffer->scan_el_dev_attr_list); |
1d892719 JC |
219 | if (ret) |
220 | goto error_ret; | |
26d25ae3 | 221 | attrcount++; |
a88b3ebc | 222 | if (chan->type != IIO_TIMESTAMP) |
26d25ae3 | 223 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
224 | chan, |
225 | &iio_scan_el_show, | |
226 | &iio_scan_el_store, | |
227 | chan->scan_index, | |
228 | 0, | |
1aa04278 | 229 | &indio_dev->dev, |
14555b14 | 230 | &buffer->scan_el_dev_attr_list); |
a88b3ebc | 231 | else |
26d25ae3 | 232 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
233 | chan, |
234 | &iio_scan_el_ts_show, | |
235 | &iio_scan_el_ts_store, | |
236 | chan->scan_index, | |
237 | 0, | |
1aa04278 | 238 | &indio_dev->dev, |
14555b14 | 239 | &buffer->scan_el_dev_attr_list); |
26d25ae3 JC |
240 | attrcount++; |
241 | ret = attrcount; | |
1d892719 JC |
242 | error_ret: |
243 | return ret; | |
244 | } | |
245 | ||
14555b14 JC |
246 | static void iio_buffer_remove_and_free_scan_dev_attr(struct iio_dev *indio_dev, |
247 | struct iio_dev_attr *p) | |
1d892719 | 248 | { |
1d892719 JC |
249 | kfree(p->dev_attr.attr.name); |
250 | kfree(p); | |
251 | } | |
252 | ||
14555b14 | 253 | static void __iio_buffer_attr_cleanup(struct iio_dev *indio_dev) |
1d892719 JC |
254 | { |
255 | struct iio_dev_attr *p, *n; | |
14555b14 | 256 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 | 257 | |
1d892719 | 258 | list_for_each_entry_safe(p, n, |
14555b14 JC |
259 | &buffer->scan_el_dev_attr_list, l) |
260 | iio_buffer_remove_and_free_scan_dev_attr(indio_dev, p); | |
1d892719 JC |
261 | } |
262 | ||
26d25ae3 JC |
263 | static const char * const iio_scan_elements_group_name = "scan_elements"; |
264 | ||
14555b14 JC |
265 | int iio_buffer_register(struct iio_dev *indio_dev, |
266 | const struct iio_chan_spec *channels, | |
267 | int num_channels) | |
1d892719 | 268 | { |
26d25ae3 JC |
269 | struct iio_dev_attr *p; |
270 | struct attribute **attr; | |
14555b14 | 271 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 JC |
272 | int ret, i, attrn, attrcount, attrcount_orig = 0; |
273 | ||
14555b14 JC |
274 | if (buffer->attrs) |
275 | indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs; | |
bf32963c | 276 | |
14555b14 JC |
277 | if (buffer->scan_el_attrs != NULL) { |
278 | attr = buffer->scan_el_attrs->attrs; | |
26d25ae3 JC |
279 | while (*attr++ != NULL) |
280 | attrcount_orig++; | |
281 | } | |
282 | attrcount = attrcount_orig; | |
14555b14 | 283 | INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list); |
1d892719 JC |
284 | if (channels) { |
285 | /* new magic */ | |
286 | for (i = 0; i < num_channels; i++) { | |
32b5eeca JC |
287 | /* Establish necessary mask length */ |
288 | if (channels[i].scan_index > | |
289 | (int)indio_dev->masklength - 1) | |
290 | indio_dev->masklength | |
291 | = indio_dev->channels[i].scan_index + 1; | |
292 | ||
14555b14 | 293 | ret = iio_buffer_add_channel_sysfs(indio_dev, |
1aa04278 | 294 | &channels[i]); |
1d892719 | 295 | if (ret < 0) |
26d25ae3 JC |
296 | goto error_cleanup_dynamic; |
297 | attrcount += ret; | |
beb80600 JC |
298 | if (channels[i].type == IIO_TIMESTAMP) |
299 | buffer->scan_index_timestamp = | |
300 | channels[i].scan_index; | |
1d892719 | 301 | } |
14555b14 | 302 | if (indio_dev->masklength && buffer->scan_mask == NULL) { |
d83fb184 TM |
303 | buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), |
304 | sizeof(*buffer->scan_mask), | |
305 | GFP_KERNEL); | |
14555b14 | 306 | if (buffer->scan_mask == NULL) { |
32b5eeca | 307 | ret = -ENOMEM; |
26d25ae3 | 308 | goto error_cleanup_dynamic; |
32b5eeca JC |
309 | } |
310 | } | |
1d892719 JC |
311 | } |
312 | ||
14555b14 | 313 | buffer->scan_el_group.name = iio_scan_elements_group_name; |
26d25ae3 | 314 | |
d83fb184 TM |
315 | buffer->scan_el_group.attrs = kcalloc(attrcount + 1, |
316 | sizeof(buffer->scan_el_group.attrs[0]), | |
317 | GFP_KERNEL); | |
14555b14 | 318 | if (buffer->scan_el_group.attrs == NULL) { |
26d25ae3 JC |
319 | ret = -ENOMEM; |
320 | goto error_free_scan_mask; | |
321 | } | |
14555b14 JC |
322 | if (buffer->scan_el_attrs) |
323 | memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs, | |
324 | sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig); | |
26d25ae3 JC |
325 | attrn = attrcount_orig; |
326 | ||
14555b14 JC |
327 | list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l) |
328 | buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr; | |
329 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group; | |
26d25ae3 | 330 | |
1d892719 | 331 | return 0; |
26d25ae3 JC |
332 | |
333 | error_free_scan_mask: | |
14555b14 | 334 | kfree(buffer->scan_mask); |
1d892719 | 335 | error_cleanup_dynamic: |
14555b14 | 336 | __iio_buffer_attr_cleanup(indio_dev); |
26d25ae3 | 337 | |
7026ea4b JC |
338 | return ret; |
339 | } | |
14555b14 | 340 | EXPORT_SYMBOL(iio_buffer_register); |
1d892719 | 341 | |
14555b14 | 342 | void iio_buffer_unregister(struct iio_dev *indio_dev) |
7026ea4b | 343 | { |
14555b14 JC |
344 | kfree(indio_dev->buffer->scan_mask); |
345 | kfree(indio_dev->buffer->scan_el_group.attrs); | |
346 | __iio_buffer_attr_cleanup(indio_dev); | |
7026ea4b | 347 | } |
14555b14 | 348 | EXPORT_SYMBOL(iio_buffer_unregister); |
7026ea4b | 349 | |
14555b14 JC |
350 | ssize_t iio_buffer_read_length(struct device *dev, |
351 | struct device_attribute *attr, | |
352 | char *buf) | |
7026ea4b | 353 | { |
1aa04278 | 354 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 355 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 356 | |
14555b14 | 357 | if (buffer->access->get_length) |
8d213f24 | 358 | return sprintf(buf, "%d\n", |
14555b14 | 359 | buffer->access->get_length(buffer)); |
7026ea4b | 360 | |
8d213f24 | 361 | return 0; |
7026ea4b | 362 | } |
14555b14 | 363 | EXPORT_SYMBOL(iio_buffer_read_length); |
7026ea4b | 364 | |
14555b14 JC |
365 | ssize_t iio_buffer_write_length(struct device *dev, |
366 | struct device_attribute *attr, | |
367 | const char *buf, | |
368 | size_t len) | |
7026ea4b JC |
369 | { |
370 | int ret; | |
371 | ulong val; | |
1aa04278 | 372 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 373 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 | 374 | |
7026ea4b JC |
375 | ret = strict_strtoul(buf, 10, &val); |
376 | if (ret) | |
377 | return ret; | |
378 | ||
14555b14 JC |
379 | if (buffer->access->get_length) |
380 | if (val == buffer->access->get_length(buffer)) | |
7026ea4b JC |
381 | return len; |
382 | ||
e38c79e0 LPC |
383 | mutex_lock(&indio_dev->mlock); |
384 | if (iio_buffer_enabled(indio_dev)) { | |
385 | ret = -EBUSY; | |
386 | } else { | |
869871b5 | 387 | if (buffer->access->set_length) |
e38c79e0 | 388 | buffer->access->set_length(buffer, val); |
e38c79e0 | 389 | ret = 0; |
7026ea4b | 390 | } |
e38c79e0 | 391 | mutex_unlock(&indio_dev->mlock); |
7026ea4b | 392 | |
e38c79e0 | 393 | return ret ? ret : len; |
7026ea4b | 394 | } |
14555b14 | 395 | EXPORT_SYMBOL(iio_buffer_write_length); |
7026ea4b | 396 | |
14555b14 JC |
397 | ssize_t iio_buffer_store_enable(struct device *dev, |
398 | struct device_attribute *attr, | |
399 | const char *buf, | |
400 | size_t len) | |
7026ea4b JC |
401 | { |
402 | int ret; | |
403 | bool requested_state, current_state; | |
404 | int previous_mode; | |
f8c6f4e9 JC |
405 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
406 | struct iio_buffer *buffer = indio_dev->buffer; | |
7026ea4b | 407 | |
f8c6f4e9 JC |
408 | mutex_lock(&indio_dev->mlock); |
409 | previous_mode = indio_dev->currentmode; | |
7026ea4b | 410 | requested_state = !(buf[0] == '0'); |
d4a6882e | 411 | current_state = iio_buffer_enabled(indio_dev); |
7026ea4b | 412 | if (current_state == requested_state) { |
14555b14 | 413 | printk(KERN_INFO "iio-buffer, current state requested again\n"); |
7026ea4b JC |
414 | goto done; |
415 | } | |
416 | if (requested_state) { | |
1612244f JC |
417 | if (indio_dev->setup_ops->preenable) { |
418 | ret = indio_dev->setup_ops->preenable(indio_dev); | |
7026ea4b JC |
419 | if (ret) { |
420 | printk(KERN_ERR | |
421 | "Buffer not started:" | |
14555b14 | 422 | "buffer preenable failed\n"); |
7026ea4b JC |
423 | goto error_ret; |
424 | } | |
425 | } | |
14555b14 JC |
426 | if (buffer->access->request_update) { |
427 | ret = buffer->access->request_update(buffer); | |
7026ea4b JC |
428 | if (ret) { |
429 | printk(KERN_INFO | |
430 | "Buffer not started:" | |
14555b14 | 431 | "buffer parameter update failed\n"); |
7026ea4b JC |
432 | goto error_ret; |
433 | } | |
434 | } | |
7026ea4b | 435 | /* Definitely possible for devices to support both of these.*/ |
f8c6f4e9 JC |
436 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) { |
437 | if (!indio_dev->trig) { | |
7026ea4b JC |
438 | printk(KERN_INFO |
439 | "Buffer not started: no trigger\n"); | |
440 | ret = -EINVAL; | |
7026ea4b JC |
441 | goto error_ret; |
442 | } | |
f8c6f4e9 JC |
443 | indio_dev->currentmode = INDIO_BUFFER_TRIGGERED; |
444 | } else if (indio_dev->modes & INDIO_BUFFER_HARDWARE) | |
445 | indio_dev->currentmode = INDIO_BUFFER_HARDWARE; | |
7026ea4b JC |
446 | else { /* should never be reached */ |
447 | ret = -EINVAL; | |
448 | goto error_ret; | |
449 | } | |
450 | ||
1612244f JC |
451 | if (indio_dev->setup_ops->postenable) { |
452 | ret = indio_dev->setup_ops->postenable(indio_dev); | |
7026ea4b JC |
453 | if (ret) { |
454 | printk(KERN_INFO | |
455 | "Buffer not started:" | |
456 | "postenable failed\n"); | |
f8c6f4e9 | 457 | indio_dev->currentmode = previous_mode; |
1612244f JC |
458 | if (indio_dev->setup_ops->postdisable) |
459 | indio_dev->setup_ops-> | |
f8c6f4e9 | 460 | postdisable(indio_dev); |
7026ea4b JC |
461 | goto error_ret; |
462 | } | |
463 | } | |
464 | } else { | |
1612244f JC |
465 | if (indio_dev->setup_ops->predisable) { |
466 | ret = indio_dev->setup_ops->predisable(indio_dev); | |
7026ea4b JC |
467 | if (ret) |
468 | goto error_ret; | |
469 | } | |
f8c6f4e9 | 470 | indio_dev->currentmode = INDIO_DIRECT_MODE; |
1612244f JC |
471 | if (indio_dev->setup_ops->postdisable) { |
472 | ret = indio_dev->setup_ops->postdisable(indio_dev); | |
7026ea4b JC |
473 | if (ret) |
474 | goto error_ret; | |
475 | } | |
476 | } | |
477 | done: | |
f8c6f4e9 | 478 | mutex_unlock(&indio_dev->mlock); |
7026ea4b JC |
479 | return len; |
480 | ||
481 | error_ret: | |
f8c6f4e9 | 482 | mutex_unlock(&indio_dev->mlock); |
7026ea4b JC |
483 | return ret; |
484 | } | |
14555b14 | 485 | EXPORT_SYMBOL(iio_buffer_store_enable); |
8d213f24 | 486 | |
14555b14 JC |
487 | ssize_t iio_buffer_show_enable(struct device *dev, |
488 | struct device_attribute *attr, | |
489 | char *buf) | |
7026ea4b | 490 | { |
f8c6f4e9 | 491 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
d4a6882e | 492 | return sprintf(buf, "%d\n", iio_buffer_enabled(indio_dev)); |
7026ea4b | 493 | } |
14555b14 | 494 | EXPORT_SYMBOL(iio_buffer_show_enable); |
7026ea4b | 495 | |
32b5eeca | 496 | /* note NULL used as error indicator as it doesn't make sense. */ |
cd4361c7 | 497 | static const unsigned long *iio_scan_mask_match(const unsigned long *av_masks, |
32b5eeca | 498 | unsigned int masklength, |
cd4361c7 | 499 | const unsigned long *mask) |
32b5eeca JC |
500 | { |
501 | if (bitmap_empty(mask, masklength)) | |
502 | return NULL; | |
503 | while (*av_masks) { | |
504 | if (bitmap_subset(mask, av_masks, masklength)) | |
505 | return av_masks; | |
506 | av_masks += BITS_TO_LONGS(masklength); | |
507 | } | |
508 | return NULL; | |
509 | } | |
510 | ||
959d2952 JC |
511 | int iio_sw_buffer_preenable(struct iio_dev *indio_dev) |
512 | { | |
513 | struct iio_buffer *buffer = indio_dev->buffer; | |
514 | const struct iio_chan_spec *ch; | |
515 | unsigned bytes = 0; | |
516 | int length, i; | |
517 | dev_dbg(&indio_dev->dev, "%s\n", __func__); | |
518 | ||
519 | /* How much space will the demuxed element take? */ | |
520 | for_each_set_bit(i, buffer->scan_mask, | |
521 | indio_dev->masklength) { | |
522 | ch = iio_find_channel_from_si(indio_dev, i); | |
523 | length = ch->scan_type.storagebits/8; | |
524 | bytes = ALIGN(bytes, length); | |
525 | bytes += length; | |
526 | } | |
527 | if (buffer->scan_timestamp) { | |
528 | ch = iio_find_channel_from_si(indio_dev, | |
529 | buffer->scan_index_timestamp); | |
530 | length = ch->scan_type.storagebits/8; | |
531 | bytes = ALIGN(bytes, length); | |
532 | bytes += length; | |
533 | } | |
534 | buffer->access->set_bytes_per_datum(buffer, bytes); | |
535 | ||
536 | /* What scan mask do we actually have ?*/ | |
537 | if (indio_dev->available_scan_masks) | |
538 | indio_dev->active_scan_mask = | |
539 | iio_scan_mask_match(indio_dev->available_scan_masks, | |
540 | indio_dev->masklength, | |
541 | buffer->scan_mask); | |
542 | else | |
543 | indio_dev->active_scan_mask = buffer->scan_mask; | |
5ada4ea9 JC |
544 | iio_update_demux(indio_dev); |
545 | ||
546 | if (indio_dev->info->update_scan_mode) | |
547 | return indio_dev->info | |
548 | ->update_scan_mode(indio_dev, | |
549 | indio_dev->active_scan_mask); | |
959d2952 JC |
550 | return 0; |
551 | } | |
552 | EXPORT_SYMBOL(iio_sw_buffer_preenable); | |
553 | ||
32b5eeca JC |
554 | /** |
555 | * iio_scan_mask_set() - set particular bit in the scan mask | |
14555b14 | 556 | * @buffer: the buffer whose scan mask we are interested in |
32b5eeca JC |
557 | * @bit: the bit to be set. |
558 | **/ | |
f79a9098 JC |
559 | int iio_scan_mask_set(struct iio_dev *indio_dev, |
560 | struct iio_buffer *buffer, int bit) | |
32b5eeca | 561 | { |
cd4361c7 | 562 | const unsigned long *mask; |
32b5eeca JC |
563 | unsigned long *trialmask; |
564 | ||
565 | trialmask = kmalloc(sizeof(*trialmask)* | |
f8c6f4e9 | 566 | BITS_TO_LONGS(indio_dev->masklength), |
32b5eeca JC |
567 | GFP_KERNEL); |
568 | ||
569 | if (trialmask == NULL) | |
570 | return -ENOMEM; | |
f8c6f4e9 | 571 | if (!indio_dev->masklength) { |
14555b14 | 572 | WARN_ON("trying to set scanmask prior to registering buffer\n"); |
32b5eeca JC |
573 | kfree(trialmask); |
574 | return -EINVAL; | |
575 | } | |
f8c6f4e9 | 576 | bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength); |
32b5eeca JC |
577 | set_bit(bit, trialmask); |
578 | ||
f8c6f4e9 JC |
579 | if (indio_dev->available_scan_masks) { |
580 | mask = iio_scan_mask_match(indio_dev->available_scan_masks, | |
581 | indio_dev->masklength, | |
32b5eeca JC |
582 | trialmask); |
583 | if (!mask) { | |
584 | kfree(trialmask); | |
585 | return -EINVAL; | |
586 | } | |
587 | } | |
f8c6f4e9 | 588 | bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength); |
32b5eeca JC |
589 | |
590 | kfree(trialmask); | |
591 | ||
592 | return 0; | |
593 | }; | |
594 | EXPORT_SYMBOL_GPL(iio_scan_mask_set); | |
595 | ||
f79a9098 JC |
596 | int iio_scan_mask_query(struct iio_dev *indio_dev, |
597 | struct iio_buffer *buffer, int bit) | |
32b5eeca | 598 | { |
f8c6f4e9 | 599 | if (bit > indio_dev->masklength) |
32b5eeca JC |
600 | return -EINVAL; |
601 | ||
14555b14 | 602 | if (!buffer->scan_mask) |
32b5eeca | 603 | return 0; |
32b5eeca | 604 | |
5a2a6e11 | 605 | return test_bit(bit, buffer->scan_mask); |
32b5eeca JC |
606 | }; |
607 | EXPORT_SYMBOL_GPL(iio_scan_mask_query); | |
5ada4ea9 JC |
608 | |
609 | /** | |
610 | * struct iio_demux_table() - table describing demux memcpy ops | |
611 | * @from: index to copy from | |
612 | * @to: index to copy to | |
613 | * @length: how many bytes to copy | |
614 | * @l: list head used for management | |
615 | */ | |
616 | struct iio_demux_table { | |
617 | unsigned from; | |
618 | unsigned to; | |
619 | unsigned length; | |
620 | struct list_head l; | |
621 | }; | |
622 | ||
623 | static unsigned char *iio_demux(struct iio_buffer *buffer, | |
624 | unsigned char *datain) | |
625 | { | |
626 | struct iio_demux_table *t; | |
627 | ||
628 | if (list_empty(&buffer->demux_list)) | |
629 | return datain; | |
630 | list_for_each_entry(t, &buffer->demux_list, l) | |
631 | memcpy(buffer->demux_bounce + t->to, | |
632 | datain + t->from, t->length); | |
633 | ||
634 | return buffer->demux_bounce; | |
635 | } | |
636 | ||
637 | int iio_push_to_buffer(struct iio_buffer *buffer, unsigned char *data, | |
638 | s64 timestamp) | |
639 | { | |
640 | unsigned char *dataout = iio_demux(buffer, data); | |
641 | ||
642 | return buffer->access->store_to(buffer, dataout, timestamp); | |
643 | } | |
644 | EXPORT_SYMBOL_GPL(iio_push_to_buffer); | |
645 | ||
646 | int iio_update_demux(struct iio_dev *indio_dev) | |
647 | { | |
648 | const struct iio_chan_spec *ch; | |
649 | struct iio_buffer *buffer = indio_dev->buffer; | |
650 | int ret, in_ind = -1, out_ind, length; | |
651 | unsigned in_loc = 0, out_loc = 0; | |
652 | struct iio_demux_table *p, *q; | |
653 | ||
654 | /* Clear out any old demux */ | |
655 | list_for_each_entry_safe(p, q, &buffer->demux_list, l) { | |
656 | list_del(&p->l); | |
657 | kfree(p); | |
658 | } | |
659 | kfree(buffer->demux_bounce); | |
660 | buffer->demux_bounce = NULL; | |
661 | ||
662 | /* First work out which scan mode we will actually have */ | |
663 | if (bitmap_equal(indio_dev->active_scan_mask, | |
664 | buffer->scan_mask, | |
665 | indio_dev->masklength)) | |
666 | return 0; | |
667 | ||
668 | /* Now we have the two masks, work from least sig and build up sizes */ | |
669 | for_each_set_bit(out_ind, | |
670 | indio_dev->active_scan_mask, | |
671 | indio_dev->masklength) { | |
672 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
673 | indio_dev->masklength, | |
674 | in_ind + 1); | |
675 | while (in_ind != out_ind) { | |
676 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
677 | indio_dev->masklength, | |
678 | in_ind + 1); | |
679 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
680 | length = ch->scan_type.storagebits/8; | |
681 | /* Make sure we are aligned */ | |
682 | in_loc += length; | |
683 | if (in_loc % length) | |
684 | in_loc += length - in_loc % length; | |
685 | } | |
686 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
687 | if (p == NULL) { | |
688 | ret = -ENOMEM; | |
689 | goto error_clear_mux_table; | |
690 | } | |
691 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
692 | length = ch->scan_type.storagebits/8; | |
693 | if (out_loc % length) | |
694 | out_loc += length - out_loc % length; | |
695 | if (in_loc % length) | |
696 | in_loc += length - in_loc % length; | |
697 | p->from = in_loc; | |
698 | p->to = out_loc; | |
699 | p->length = length; | |
700 | list_add_tail(&p->l, &buffer->demux_list); | |
701 | out_loc += length; | |
702 | in_loc += length; | |
703 | } | |
704 | /* Relies on scan_timestamp being last */ | |
705 | if (buffer->scan_timestamp) { | |
706 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
707 | if (p == NULL) { | |
708 | ret = -ENOMEM; | |
709 | goto error_clear_mux_table; | |
710 | } | |
711 | ch = iio_find_channel_from_si(indio_dev, | |
712 | buffer->scan_index_timestamp); | |
713 | length = ch->scan_type.storagebits/8; | |
714 | if (out_loc % length) | |
715 | out_loc += length - out_loc % length; | |
716 | if (in_loc % length) | |
717 | in_loc += length - in_loc % length; | |
718 | p->from = in_loc; | |
719 | p->to = out_loc; | |
720 | p->length = length; | |
721 | list_add_tail(&p->l, &buffer->demux_list); | |
722 | out_loc += length; | |
723 | in_loc += length; | |
724 | } | |
725 | buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL); | |
726 | if (buffer->demux_bounce == NULL) { | |
727 | ret = -ENOMEM; | |
728 | goto error_clear_mux_table; | |
729 | } | |
730 | return 0; | |
731 | ||
732 | error_clear_mux_table: | |
733 | list_for_each_entry_safe(p, q, &buffer->demux_list, l) { | |
734 | list_del(&p->l); | |
735 | kfree(p); | |
736 | } | |
737 | return ret; | |
738 | } | |
739 | EXPORT_SYMBOL_GPL(iio_update_demux); |