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