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 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; | |
e53f5ac5 | 108 | struct iio_dev *indio_dev = dev_to_iio_dev(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; |
e53f5ac5 | 129 | struct iio_dev *indio_dev = dev_to_iio_dev(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 | { | |
e53f5ac5 | 165 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
f8c6f4e9 | 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; |
e53f5ac5 | 175 | struct iio_dev *indio_dev = dev_to_iio_dev(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; |
fd6487f8 | 188 | indio_dev->scan_timestamp = state; |
8d213f24 JC |
189 | error_ret: |
190 | mutex_unlock(&indio_dev->mlock); | |
191 | ||
192 | return ret ? ret : len; | |
193 | } | |
194 | ||
14555b14 JC |
195 | static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev, |
196 | const struct iio_chan_spec *chan) | |
1d892719 | 197 | { |
26d25ae3 | 198 | int ret, attrcount = 0; |
14555b14 | 199 | struct iio_buffer *buffer = indio_dev->buffer; |
1d892719 | 200 | |
26d25ae3 | 201 | ret = __iio_add_chan_devattr("index", |
1d892719 JC |
202 | chan, |
203 | &iio_show_scan_index, | |
204 | NULL, | |
205 | 0, | |
206 | 0, | |
1aa04278 | 207 | &indio_dev->dev, |
14555b14 | 208 | &buffer->scan_el_dev_attr_list); |
1d892719 JC |
209 | if (ret) |
210 | goto error_ret; | |
26d25ae3 JC |
211 | attrcount++; |
212 | ret = __iio_add_chan_devattr("type", | |
1d892719 JC |
213 | chan, |
214 | &iio_show_fixed_type, | |
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 | 222 | attrcount++; |
a88b3ebc | 223 | if (chan->type != IIO_TIMESTAMP) |
26d25ae3 | 224 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
225 | chan, |
226 | &iio_scan_el_show, | |
227 | &iio_scan_el_store, | |
228 | chan->scan_index, | |
229 | 0, | |
1aa04278 | 230 | &indio_dev->dev, |
14555b14 | 231 | &buffer->scan_el_dev_attr_list); |
a88b3ebc | 232 | else |
26d25ae3 | 233 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
234 | chan, |
235 | &iio_scan_el_ts_show, | |
236 | &iio_scan_el_ts_store, | |
237 | chan->scan_index, | |
238 | 0, | |
1aa04278 | 239 | &indio_dev->dev, |
14555b14 | 240 | &buffer->scan_el_dev_attr_list); |
26d25ae3 JC |
241 | attrcount++; |
242 | ret = attrcount; | |
1d892719 JC |
243 | error_ret: |
244 | return ret; | |
245 | } | |
246 | ||
14555b14 JC |
247 | static void iio_buffer_remove_and_free_scan_dev_attr(struct iio_dev *indio_dev, |
248 | struct iio_dev_attr *p) | |
1d892719 | 249 | { |
1d892719 JC |
250 | kfree(p->dev_attr.attr.name); |
251 | kfree(p); | |
252 | } | |
253 | ||
14555b14 | 254 | static void __iio_buffer_attr_cleanup(struct iio_dev *indio_dev) |
1d892719 JC |
255 | { |
256 | struct iio_dev_attr *p, *n; | |
14555b14 | 257 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 | 258 | |
1d892719 | 259 | list_for_each_entry_safe(p, n, |
14555b14 JC |
260 | &buffer->scan_el_dev_attr_list, l) |
261 | iio_buffer_remove_and_free_scan_dev_attr(indio_dev, p); | |
1d892719 JC |
262 | } |
263 | ||
26d25ae3 JC |
264 | static const char * const iio_scan_elements_group_name = "scan_elements"; |
265 | ||
14555b14 JC |
266 | int iio_buffer_register(struct iio_dev *indio_dev, |
267 | const struct iio_chan_spec *channels, | |
268 | int num_channels) | |
1d892719 | 269 | { |
26d25ae3 JC |
270 | struct iio_dev_attr *p; |
271 | struct attribute **attr; | |
14555b14 | 272 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 JC |
273 | int ret, i, attrn, attrcount, attrcount_orig = 0; |
274 | ||
14555b14 JC |
275 | if (buffer->attrs) |
276 | indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs; | |
bf32963c | 277 | |
14555b14 JC |
278 | if (buffer->scan_el_attrs != NULL) { |
279 | attr = buffer->scan_el_attrs->attrs; | |
26d25ae3 JC |
280 | while (*attr++ != NULL) |
281 | attrcount_orig++; | |
282 | } | |
283 | attrcount = attrcount_orig; | |
14555b14 | 284 | INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list); |
1d892719 JC |
285 | if (channels) { |
286 | /* new magic */ | |
287 | for (i = 0; i < num_channels; i++) { | |
f5b81ddd LPC |
288 | if (channels[i].scan_index < 0) |
289 | continue; | |
290 | ||
32b5eeca JC |
291 | /* Establish necessary mask length */ |
292 | if (channels[i].scan_index > | |
293 | (int)indio_dev->masklength - 1) | |
294 | indio_dev->masklength | |
e1dc7bee | 295 | = channels[i].scan_index + 1; |
32b5eeca | 296 | |
14555b14 | 297 | ret = iio_buffer_add_channel_sysfs(indio_dev, |
1aa04278 | 298 | &channels[i]); |
1d892719 | 299 | if (ret < 0) |
26d25ae3 JC |
300 | goto error_cleanup_dynamic; |
301 | attrcount += ret; | |
beb80600 | 302 | if (channels[i].type == IIO_TIMESTAMP) |
f1264809 | 303 | indio_dev->scan_index_timestamp = |
beb80600 | 304 | channels[i].scan_index; |
1d892719 | 305 | } |
14555b14 | 306 | if (indio_dev->masklength && buffer->scan_mask == NULL) { |
d83fb184 TM |
307 | buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), |
308 | sizeof(*buffer->scan_mask), | |
309 | GFP_KERNEL); | |
14555b14 | 310 | if (buffer->scan_mask == NULL) { |
32b5eeca | 311 | ret = -ENOMEM; |
26d25ae3 | 312 | goto error_cleanup_dynamic; |
32b5eeca JC |
313 | } |
314 | } | |
1d892719 JC |
315 | } |
316 | ||
14555b14 | 317 | buffer->scan_el_group.name = iio_scan_elements_group_name; |
26d25ae3 | 318 | |
d83fb184 TM |
319 | buffer->scan_el_group.attrs = kcalloc(attrcount + 1, |
320 | sizeof(buffer->scan_el_group.attrs[0]), | |
321 | GFP_KERNEL); | |
14555b14 | 322 | if (buffer->scan_el_group.attrs == NULL) { |
26d25ae3 JC |
323 | ret = -ENOMEM; |
324 | goto error_free_scan_mask; | |
325 | } | |
14555b14 JC |
326 | if (buffer->scan_el_attrs) |
327 | memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs, | |
328 | sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig); | |
26d25ae3 JC |
329 | attrn = attrcount_orig; |
330 | ||
14555b14 JC |
331 | list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l) |
332 | buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr; | |
333 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group; | |
26d25ae3 | 334 | |
1d892719 | 335 | return 0; |
26d25ae3 JC |
336 | |
337 | error_free_scan_mask: | |
14555b14 | 338 | kfree(buffer->scan_mask); |
1d892719 | 339 | error_cleanup_dynamic: |
14555b14 | 340 | __iio_buffer_attr_cleanup(indio_dev); |
26d25ae3 | 341 | |
7026ea4b JC |
342 | return ret; |
343 | } | |
14555b14 | 344 | EXPORT_SYMBOL(iio_buffer_register); |
1d892719 | 345 | |
14555b14 | 346 | void iio_buffer_unregister(struct iio_dev *indio_dev) |
7026ea4b | 347 | { |
14555b14 JC |
348 | kfree(indio_dev->buffer->scan_mask); |
349 | kfree(indio_dev->buffer->scan_el_group.attrs); | |
350 | __iio_buffer_attr_cleanup(indio_dev); | |
7026ea4b | 351 | } |
14555b14 | 352 | EXPORT_SYMBOL(iio_buffer_unregister); |
7026ea4b | 353 | |
14555b14 JC |
354 | ssize_t iio_buffer_read_length(struct device *dev, |
355 | struct device_attribute *attr, | |
356 | char *buf) | |
7026ea4b | 357 | { |
e53f5ac5 | 358 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 359 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 360 | |
14555b14 | 361 | if (buffer->access->get_length) |
8d213f24 | 362 | return sprintf(buf, "%d\n", |
14555b14 | 363 | buffer->access->get_length(buffer)); |
7026ea4b | 364 | |
8d213f24 | 365 | return 0; |
7026ea4b | 366 | } |
14555b14 | 367 | EXPORT_SYMBOL(iio_buffer_read_length); |
7026ea4b | 368 | |
14555b14 JC |
369 | ssize_t iio_buffer_write_length(struct device *dev, |
370 | struct device_attribute *attr, | |
371 | const char *buf, | |
372 | size_t len) | |
7026ea4b JC |
373 | { |
374 | int ret; | |
375 | ulong val; | |
e53f5ac5 | 376 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
14555b14 | 377 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 | 378 | |
7026ea4b JC |
379 | ret = strict_strtoul(buf, 10, &val); |
380 | if (ret) | |
381 | return ret; | |
382 | ||
14555b14 JC |
383 | if (buffer->access->get_length) |
384 | if (val == buffer->access->get_length(buffer)) | |
7026ea4b JC |
385 | return len; |
386 | ||
e38c79e0 LPC |
387 | mutex_lock(&indio_dev->mlock); |
388 | if (iio_buffer_enabled(indio_dev)) { | |
389 | ret = -EBUSY; | |
390 | } else { | |
869871b5 | 391 | if (buffer->access->set_length) |
e38c79e0 | 392 | buffer->access->set_length(buffer, val); |
e38c79e0 | 393 | ret = 0; |
7026ea4b | 394 | } |
e38c79e0 | 395 | mutex_unlock(&indio_dev->mlock); |
7026ea4b | 396 | |
e38c79e0 | 397 | return ret ? ret : len; |
7026ea4b | 398 | } |
14555b14 | 399 | EXPORT_SYMBOL(iio_buffer_write_length); |
7026ea4b | 400 | |
14555b14 JC |
401 | ssize_t iio_buffer_store_enable(struct device *dev, |
402 | struct device_attribute *attr, | |
403 | const char *buf, | |
404 | size_t len) | |
7026ea4b JC |
405 | { |
406 | int ret; | |
407 | bool requested_state, current_state; | |
408 | int previous_mode; | |
e53f5ac5 | 409 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
f8c6f4e9 | 410 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 411 | |
f8c6f4e9 JC |
412 | mutex_lock(&indio_dev->mlock); |
413 | previous_mode = indio_dev->currentmode; | |
7026ea4b | 414 | requested_state = !(buf[0] == '0'); |
d4a6882e | 415 | current_state = iio_buffer_enabled(indio_dev); |
7026ea4b | 416 | if (current_state == requested_state) { |
14555b14 | 417 | printk(KERN_INFO "iio-buffer, current state requested again\n"); |
7026ea4b JC |
418 | goto done; |
419 | } | |
420 | if (requested_state) { | |
1612244f JC |
421 | if (indio_dev->setup_ops->preenable) { |
422 | ret = indio_dev->setup_ops->preenable(indio_dev); | |
7026ea4b JC |
423 | if (ret) { |
424 | printk(KERN_ERR | |
425 | "Buffer not started:" | |
14555b14 | 426 | "buffer preenable failed\n"); |
7026ea4b JC |
427 | goto error_ret; |
428 | } | |
429 | } | |
14555b14 JC |
430 | if (buffer->access->request_update) { |
431 | ret = buffer->access->request_update(buffer); | |
7026ea4b JC |
432 | if (ret) { |
433 | printk(KERN_INFO | |
434 | "Buffer not started:" | |
14555b14 | 435 | "buffer parameter update failed\n"); |
7026ea4b JC |
436 | goto error_ret; |
437 | } | |
438 | } | |
7026ea4b | 439 | /* Definitely possible for devices to support both of these.*/ |
f8c6f4e9 JC |
440 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) { |
441 | if (!indio_dev->trig) { | |
7026ea4b JC |
442 | printk(KERN_INFO |
443 | "Buffer not started: no trigger\n"); | |
444 | ret = -EINVAL; | |
7026ea4b JC |
445 | goto error_ret; |
446 | } | |
f8c6f4e9 JC |
447 | indio_dev->currentmode = INDIO_BUFFER_TRIGGERED; |
448 | } else if (indio_dev->modes & INDIO_BUFFER_HARDWARE) | |
449 | indio_dev->currentmode = INDIO_BUFFER_HARDWARE; | |
7026ea4b JC |
450 | else { /* should never be reached */ |
451 | ret = -EINVAL; | |
452 | goto error_ret; | |
453 | } | |
454 | ||
1612244f JC |
455 | if (indio_dev->setup_ops->postenable) { |
456 | ret = indio_dev->setup_ops->postenable(indio_dev); | |
7026ea4b JC |
457 | if (ret) { |
458 | printk(KERN_INFO | |
459 | "Buffer not started:" | |
460 | "postenable failed\n"); | |
f8c6f4e9 | 461 | indio_dev->currentmode = previous_mode; |
1612244f JC |
462 | if (indio_dev->setup_ops->postdisable) |
463 | indio_dev->setup_ops-> | |
f8c6f4e9 | 464 | postdisable(indio_dev); |
7026ea4b JC |
465 | goto error_ret; |
466 | } | |
467 | } | |
468 | } else { | |
1612244f JC |
469 | if (indio_dev->setup_ops->predisable) { |
470 | ret = indio_dev->setup_ops->predisable(indio_dev); | |
7026ea4b JC |
471 | if (ret) |
472 | goto error_ret; | |
473 | } | |
f8c6f4e9 | 474 | indio_dev->currentmode = INDIO_DIRECT_MODE; |
1612244f JC |
475 | if (indio_dev->setup_ops->postdisable) { |
476 | ret = indio_dev->setup_ops->postdisable(indio_dev); | |
7026ea4b JC |
477 | if (ret) |
478 | goto error_ret; | |
479 | } | |
480 | } | |
481 | done: | |
f8c6f4e9 | 482 | mutex_unlock(&indio_dev->mlock); |
7026ea4b JC |
483 | return len; |
484 | ||
485 | error_ret: | |
f8c6f4e9 | 486 | mutex_unlock(&indio_dev->mlock); |
7026ea4b JC |
487 | return ret; |
488 | } | |
14555b14 | 489 | EXPORT_SYMBOL(iio_buffer_store_enable); |
8d213f24 | 490 | |
14555b14 JC |
491 | ssize_t iio_buffer_show_enable(struct device *dev, |
492 | struct device_attribute *attr, | |
493 | char *buf) | |
7026ea4b | 494 | { |
e53f5ac5 | 495 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
d4a6882e | 496 | return sprintf(buf, "%d\n", iio_buffer_enabled(indio_dev)); |
7026ea4b | 497 | } |
14555b14 | 498 | EXPORT_SYMBOL(iio_buffer_show_enable); |
7026ea4b | 499 | |
32b5eeca | 500 | /* note NULL used as error indicator as it doesn't make sense. */ |
cd4361c7 | 501 | static const unsigned long *iio_scan_mask_match(const unsigned long *av_masks, |
32b5eeca | 502 | unsigned int masklength, |
cd4361c7 | 503 | const unsigned long *mask) |
32b5eeca JC |
504 | { |
505 | if (bitmap_empty(mask, masklength)) | |
506 | return NULL; | |
507 | while (*av_masks) { | |
508 | if (bitmap_subset(mask, av_masks, masklength)) | |
509 | return av_masks; | |
510 | av_masks += BITS_TO_LONGS(masklength); | |
511 | } | |
512 | return NULL; | |
513 | } | |
514 | ||
6b3b58ed JC |
515 | static int iio_compute_scan_bytes(struct iio_dev *indio_dev, const long *mask, |
516 | bool timestamp) | |
959d2952 | 517 | { |
959d2952 JC |
518 | const struct iio_chan_spec *ch; |
519 | unsigned bytes = 0; | |
520 | int length, i; | |
959d2952 JC |
521 | |
522 | /* How much space will the demuxed element take? */ | |
6b3b58ed | 523 | for_each_set_bit(i, mask, |
959d2952 JC |
524 | indio_dev->masklength) { |
525 | ch = iio_find_channel_from_si(indio_dev, i); | |
6b3b58ed | 526 | length = ch->scan_type.storagebits / 8; |
959d2952 JC |
527 | bytes = ALIGN(bytes, length); |
528 | bytes += length; | |
529 | } | |
6b3b58ed | 530 | if (timestamp) { |
959d2952 | 531 | ch = iio_find_channel_from_si(indio_dev, |
f1264809 | 532 | indio_dev->scan_index_timestamp); |
6b3b58ed | 533 | length = ch->scan_type.storagebits / 8; |
959d2952 JC |
534 | bytes = ALIGN(bytes, length); |
535 | bytes += length; | |
536 | } | |
6b3b58ed JC |
537 | return bytes; |
538 | } | |
539 | ||
540 | int iio_sw_buffer_preenable(struct iio_dev *indio_dev) | |
541 | { | |
542 | struct iio_buffer *buffer = indio_dev->buffer; | |
6b3b58ed JC |
543 | dev_dbg(&indio_dev->dev, "%s\n", __func__); |
544 | ||
545 | /* How much space will the demuxed element take? */ | |
420fe2e9 JC |
546 | indio_dev->scan_bytes = |
547 | iio_compute_scan_bytes(indio_dev, buffer->scan_mask, | |
6b3b58ed | 548 | buffer->scan_timestamp); |
420fe2e9 | 549 | buffer->access->set_bytes_per_datum(buffer, indio_dev->scan_bytes); |
959d2952 JC |
550 | |
551 | /* What scan mask do we actually have ?*/ | |
552 | if (indio_dev->available_scan_masks) | |
553 | indio_dev->active_scan_mask = | |
554 | iio_scan_mask_match(indio_dev->available_scan_masks, | |
555 | indio_dev->masklength, | |
556 | buffer->scan_mask); | |
557 | else | |
558 | indio_dev->active_scan_mask = buffer->scan_mask; | |
aff1eb4e LPC |
559 | |
560 | if (indio_dev->active_scan_mask == NULL) | |
561 | return -EINVAL; | |
562 | ||
5ada4ea9 JC |
563 | iio_update_demux(indio_dev); |
564 | ||
565 | if (indio_dev->info->update_scan_mode) | |
566 | return indio_dev->info | |
567 | ->update_scan_mode(indio_dev, | |
568 | indio_dev->active_scan_mask); | |
959d2952 JC |
569 | return 0; |
570 | } | |
571 | EXPORT_SYMBOL(iio_sw_buffer_preenable); | |
572 | ||
81636632 LPC |
573 | /** |
574 | * iio_validate_scan_mask_onehot() - Validates that exactly one channel is selected | |
575 | * @indio_dev: the iio device | |
576 | * @mask: scan mask to be checked | |
577 | * | |
578 | * Return true if exactly one bit is set in the scan mask, false otherwise. It | |
579 | * can be used for devices where only one channel can be active for sampling at | |
580 | * a time. | |
581 | */ | |
582 | bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev, | |
583 | const unsigned long *mask) | |
584 | { | |
585 | return bitmap_weight(mask, indio_dev->masklength) == 1; | |
586 | } | |
587 | EXPORT_SYMBOL_GPL(iio_validate_scan_mask_onehot); | |
588 | ||
939546d1 LPC |
589 | static bool iio_validate_scan_mask(struct iio_dev *indio_dev, |
590 | const unsigned long *mask) | |
591 | { | |
592 | if (!indio_dev->setup_ops->validate_scan_mask) | |
593 | return true; | |
594 | ||
595 | return indio_dev->setup_ops->validate_scan_mask(indio_dev, mask); | |
596 | } | |
597 | ||
32b5eeca JC |
598 | /** |
599 | * iio_scan_mask_set() - set particular bit in the scan mask | |
14555b14 | 600 | * @buffer: the buffer whose scan mask we are interested in |
32b5eeca JC |
601 | * @bit: the bit to be set. |
602 | **/ | |
f79a9098 JC |
603 | int iio_scan_mask_set(struct iio_dev *indio_dev, |
604 | struct iio_buffer *buffer, int bit) | |
32b5eeca | 605 | { |
cd4361c7 | 606 | const unsigned long *mask; |
32b5eeca JC |
607 | unsigned long *trialmask; |
608 | ||
609 | trialmask = kmalloc(sizeof(*trialmask)* | |
f8c6f4e9 | 610 | BITS_TO_LONGS(indio_dev->masklength), |
32b5eeca JC |
611 | GFP_KERNEL); |
612 | ||
613 | if (trialmask == NULL) | |
614 | return -ENOMEM; | |
f8c6f4e9 | 615 | if (!indio_dev->masklength) { |
14555b14 | 616 | WARN_ON("trying to set scanmask prior to registering buffer\n"); |
939546d1 | 617 | goto err_invalid_mask; |
32b5eeca | 618 | } |
f8c6f4e9 | 619 | bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength); |
32b5eeca JC |
620 | set_bit(bit, trialmask); |
621 | ||
939546d1 LPC |
622 | if (!iio_validate_scan_mask(indio_dev, trialmask)) |
623 | goto err_invalid_mask; | |
624 | ||
f8c6f4e9 JC |
625 | if (indio_dev->available_scan_masks) { |
626 | mask = iio_scan_mask_match(indio_dev->available_scan_masks, | |
627 | indio_dev->masklength, | |
32b5eeca | 628 | trialmask); |
939546d1 LPC |
629 | if (!mask) |
630 | goto err_invalid_mask; | |
32b5eeca | 631 | } |
f8c6f4e9 | 632 | bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength); |
32b5eeca JC |
633 | |
634 | kfree(trialmask); | |
635 | ||
636 | return 0; | |
939546d1 LPC |
637 | |
638 | err_invalid_mask: | |
639 | kfree(trialmask); | |
640 | return -EINVAL; | |
641 | } | |
32b5eeca JC |
642 | EXPORT_SYMBOL_GPL(iio_scan_mask_set); |
643 | ||
f79a9098 JC |
644 | int iio_scan_mask_query(struct iio_dev *indio_dev, |
645 | struct iio_buffer *buffer, int bit) | |
32b5eeca | 646 | { |
f8c6f4e9 | 647 | if (bit > indio_dev->masklength) |
32b5eeca JC |
648 | return -EINVAL; |
649 | ||
14555b14 | 650 | if (!buffer->scan_mask) |
32b5eeca | 651 | return 0; |
32b5eeca | 652 | |
5a2a6e11 | 653 | return test_bit(bit, buffer->scan_mask); |
32b5eeca JC |
654 | }; |
655 | EXPORT_SYMBOL_GPL(iio_scan_mask_query); | |
5ada4ea9 JC |
656 | |
657 | /** | |
658 | * struct iio_demux_table() - table describing demux memcpy ops | |
659 | * @from: index to copy from | |
660 | * @to: index to copy to | |
661 | * @length: how many bytes to copy | |
662 | * @l: list head used for management | |
663 | */ | |
664 | struct iio_demux_table { | |
665 | unsigned from; | |
666 | unsigned to; | |
667 | unsigned length; | |
668 | struct list_head l; | |
669 | }; | |
670 | ||
671 | static unsigned char *iio_demux(struct iio_buffer *buffer, | |
672 | unsigned char *datain) | |
673 | { | |
674 | struct iio_demux_table *t; | |
675 | ||
676 | if (list_empty(&buffer->demux_list)) | |
677 | return datain; | |
678 | list_for_each_entry(t, &buffer->demux_list, l) | |
679 | memcpy(buffer->demux_bounce + t->to, | |
680 | datain + t->from, t->length); | |
681 | ||
682 | return buffer->demux_bounce; | |
683 | } | |
684 | ||
685 | int iio_push_to_buffer(struct iio_buffer *buffer, unsigned char *data, | |
686 | s64 timestamp) | |
687 | { | |
688 | unsigned char *dataout = iio_demux(buffer, data); | |
689 | ||
690 | return buffer->access->store_to(buffer, dataout, timestamp); | |
691 | } | |
692 | EXPORT_SYMBOL_GPL(iio_push_to_buffer); | |
693 | ||
842cd100 JC |
694 | static void iio_buffer_demux_free(struct iio_buffer *buffer) |
695 | { | |
696 | struct iio_demux_table *p, *q; | |
697 | list_for_each_entry_safe(p, q, &buffer->demux_list, l) { | |
698 | list_del(&p->l); | |
699 | kfree(p); | |
700 | } | |
701 | } | |
702 | ||
5ada4ea9 JC |
703 | int iio_update_demux(struct iio_dev *indio_dev) |
704 | { | |
705 | const struct iio_chan_spec *ch; | |
706 | struct iio_buffer *buffer = indio_dev->buffer; | |
707 | int ret, in_ind = -1, out_ind, length; | |
708 | unsigned in_loc = 0, out_loc = 0; | |
842cd100 | 709 | struct iio_demux_table *p; |
5ada4ea9 JC |
710 | |
711 | /* Clear out any old demux */ | |
842cd100 | 712 | iio_buffer_demux_free(buffer); |
5ada4ea9 JC |
713 | kfree(buffer->demux_bounce); |
714 | buffer->demux_bounce = NULL; | |
715 | ||
716 | /* First work out which scan mode we will actually have */ | |
717 | if (bitmap_equal(indio_dev->active_scan_mask, | |
718 | buffer->scan_mask, | |
719 | indio_dev->masklength)) | |
720 | return 0; | |
721 | ||
722 | /* Now we have the two masks, work from least sig and build up sizes */ | |
723 | for_each_set_bit(out_ind, | |
724 | indio_dev->active_scan_mask, | |
725 | indio_dev->masklength) { | |
726 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
727 | indio_dev->masklength, | |
728 | in_ind + 1); | |
729 | while (in_ind != out_ind) { | |
730 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
731 | indio_dev->masklength, | |
732 | in_ind + 1); | |
733 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
734 | length = ch->scan_type.storagebits/8; | |
735 | /* Make sure we are aligned */ | |
736 | in_loc += length; | |
737 | if (in_loc % length) | |
738 | in_loc += length - in_loc % length; | |
739 | } | |
740 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
741 | if (p == NULL) { | |
742 | ret = -ENOMEM; | |
743 | goto error_clear_mux_table; | |
744 | } | |
745 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
746 | length = ch->scan_type.storagebits/8; | |
747 | if (out_loc % length) | |
748 | out_loc += length - out_loc % length; | |
749 | if (in_loc % length) | |
750 | in_loc += length - in_loc % length; | |
751 | p->from = in_loc; | |
752 | p->to = out_loc; | |
753 | p->length = length; | |
754 | list_add_tail(&p->l, &buffer->demux_list); | |
755 | out_loc += length; | |
756 | in_loc += length; | |
757 | } | |
758 | /* Relies on scan_timestamp being last */ | |
759 | if (buffer->scan_timestamp) { | |
760 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
761 | if (p == NULL) { | |
762 | ret = -ENOMEM; | |
763 | goto error_clear_mux_table; | |
764 | } | |
765 | ch = iio_find_channel_from_si(indio_dev, | |
f1264809 | 766 | indio_dev->scan_index_timestamp); |
5ada4ea9 JC |
767 | length = ch->scan_type.storagebits/8; |
768 | if (out_loc % length) | |
769 | out_loc += length - out_loc % length; | |
770 | if (in_loc % length) | |
771 | in_loc += length - in_loc % length; | |
772 | p->from = in_loc; | |
773 | p->to = out_loc; | |
774 | p->length = length; | |
775 | list_add_tail(&p->l, &buffer->demux_list); | |
776 | out_loc += length; | |
777 | in_loc += length; | |
778 | } | |
779 | buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL); | |
780 | if (buffer->demux_bounce == NULL) { | |
781 | ret = -ENOMEM; | |
782 | goto error_clear_mux_table; | |
783 | } | |
784 | return 0; | |
785 | ||
786 | error_clear_mux_table: | |
842cd100 JC |
787 | iio_buffer_demux_free(buffer); |
788 | ||
5ada4ea9 JC |
789 | return ret; |
790 | } | |
791 | EXPORT_SYMBOL_GPL(iio_update_demux); |