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" |
3811cd62 | 27 | #include "buffer_generic.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 | |
5565a450 | 46 | if (!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 | ||
30eb82f0 | 67 | int iio_chrdev_buffer_open(struct iio_dev *indio_dev) |
7026ea4b | 68 | { |
14555b14 | 69 | struct iio_buffer *rb = indio_dev->buffer; |
30eb82f0 JC |
70 | if (!rb) |
71 | return -EINVAL; | |
72 | if (rb->access->mark_in_use) | |
1aa04278 | 73 | rb->access->mark_in_use(rb); |
30eb82f0 | 74 | return 0; |
7026ea4b | 75 | } |
7026ea4b | 76 | |
14555b14 | 77 | void iio_chrdev_buffer_release(struct iio_dev *indio_dev) |
7026ea4b | 78 | { |
14555b14 | 79 | struct iio_buffer *rb = indio_dev->buffer; |
758d988c | 80 | |
1aa04278 JC |
81 | clear_bit(IIO_BUSY_BIT_POS, &rb->flags); |
82 | if (rb->access->unmark_in_use) | |
83 | rb->access->unmark_in_use(rb); | |
7026ea4b JC |
84 | } |
85 | ||
f8c6f4e9 | 86 | void iio_buffer_init(struct iio_buffer *buffer, struct iio_dev *indio_dev) |
7026ea4b | 87 | { |
f8c6f4e9 | 88 | buffer->indio_dev = indio_dev; |
14555b14 | 89 | init_waitqueue_head(&buffer->pollq); |
7026ea4b | 90 | } |
14555b14 | 91 | EXPORT_SYMBOL(iio_buffer_init); |
7026ea4b | 92 | |
1d892719 | 93 | static ssize_t iio_show_scan_index(struct device *dev, |
8d213f24 JC |
94 | struct device_attribute *attr, |
95 | char *buf) | |
1d892719 | 96 | { |
8d213f24 | 97 | return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index); |
1d892719 JC |
98 | } |
99 | ||
100 | static ssize_t iio_show_fixed_type(struct device *dev, | |
101 | struct device_attribute *attr, | |
102 | char *buf) | |
103 | { | |
104 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
8310b86c JC |
105 | u8 type = this_attr->c->scan_type.endianness; |
106 | ||
107 | if (type == IIO_CPU) { | |
9d5d1153 JC |
108 | #ifdef __LITTLE_ENDIAN |
109 | type = IIO_LE; | |
110 | #else | |
111 | type = IIO_BE; | |
112 | #endif | |
8310b86c JC |
113 | } |
114 | return sprintf(buf, "%s:%c%d/%d>>%u\n", | |
115 | iio_endian_prefix[type], | |
1d892719 JC |
116 | this_attr->c->scan_type.sign, |
117 | this_attr->c->scan_type.realbits, | |
118 | this_attr->c->scan_type.storagebits, | |
119 | this_attr->c->scan_type.shift); | |
120 | } | |
121 | ||
8d213f24 JC |
122 | static ssize_t iio_scan_el_show(struct device *dev, |
123 | struct device_attribute *attr, | |
124 | char *buf) | |
125 | { | |
126 | int ret; | |
f8c6f4e9 | 127 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
8d213f24 | 128 | |
f8c6f4e9 | 129 | ret = iio_scan_mask_query(indio_dev->buffer, |
1aa04278 | 130 | to_iio_dev_attr(attr)->address); |
8d213f24 JC |
131 | if (ret < 0) |
132 | return ret; | |
133 | return sprintf(buf, "%d\n", ret); | |
134 | } | |
135 | ||
14555b14 | 136 | static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit) |
8d213f24 | 137 | { |
14555b14 JC |
138 | clear_bit(bit, buffer->scan_mask); |
139 | buffer->scan_count--; | |
8d213f24 JC |
140 | return 0; |
141 | } | |
142 | ||
143 | static ssize_t iio_scan_el_store(struct device *dev, | |
144 | struct device_attribute *attr, | |
145 | const char *buf, | |
146 | size_t len) | |
147 | { | |
148 | int ret = 0; | |
149 | bool state; | |
1aa04278 | 150 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 151 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 JC |
152 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
153 | ||
154 | state = !(buf[0] == '0'); | |
155 | mutex_lock(&indio_dev->mlock); | |
ec3afa40 | 156 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { |
8d213f24 JC |
157 | ret = -EBUSY; |
158 | goto error_ret; | |
159 | } | |
14555b14 | 160 | ret = iio_scan_mask_query(buffer, this_attr->address); |
8d213f24 JC |
161 | if (ret < 0) |
162 | goto error_ret; | |
163 | if (!state && ret) { | |
14555b14 | 164 | ret = iio_scan_mask_clear(buffer, this_attr->address); |
8d213f24 JC |
165 | if (ret) |
166 | goto error_ret; | |
167 | } else if (state && !ret) { | |
14555b14 | 168 | ret = iio_scan_mask_set(buffer, this_attr->address); |
8d213f24 JC |
169 | if (ret) |
170 | goto error_ret; | |
171 | } | |
172 | ||
173 | error_ret: | |
174 | mutex_unlock(&indio_dev->mlock); | |
175 | ||
176 | return ret ? ret : len; | |
177 | ||
178 | } | |
179 | ||
180 | static ssize_t iio_scan_el_ts_show(struct device *dev, | |
181 | struct device_attribute *attr, | |
182 | char *buf) | |
183 | { | |
f8c6f4e9 JC |
184 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
185 | return sprintf(buf, "%d\n", indio_dev->buffer->scan_timestamp); | |
8d213f24 JC |
186 | } |
187 | ||
188 | static ssize_t iio_scan_el_ts_store(struct device *dev, | |
189 | struct device_attribute *attr, | |
190 | const char *buf, | |
191 | size_t len) | |
192 | { | |
193 | int ret = 0; | |
1aa04278 | 194 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
8d213f24 | 195 | bool state; |
1aa04278 | 196 | |
8d213f24 JC |
197 | state = !(buf[0] == '0'); |
198 | mutex_lock(&indio_dev->mlock); | |
ec3afa40 | 199 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { |
8d213f24 JC |
200 | ret = -EBUSY; |
201 | goto error_ret; | |
202 | } | |
14555b14 | 203 | indio_dev->buffer->scan_timestamp = state; |
8d213f24 JC |
204 | error_ret: |
205 | mutex_unlock(&indio_dev->mlock); | |
206 | ||
207 | return ret ? ret : len; | |
208 | } | |
209 | ||
14555b14 JC |
210 | static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev, |
211 | const struct iio_chan_spec *chan) | |
1d892719 | 212 | { |
26d25ae3 | 213 | int ret, attrcount = 0; |
14555b14 | 214 | struct iio_buffer *buffer = indio_dev->buffer; |
1d892719 | 215 | |
26d25ae3 | 216 | ret = __iio_add_chan_devattr("index", |
1d892719 JC |
217 | chan, |
218 | &iio_show_scan_index, | |
219 | NULL, | |
220 | 0, | |
221 | 0, | |
1aa04278 | 222 | &indio_dev->dev, |
14555b14 | 223 | &buffer->scan_el_dev_attr_list); |
1d892719 JC |
224 | if (ret) |
225 | goto error_ret; | |
26d25ae3 JC |
226 | attrcount++; |
227 | ret = __iio_add_chan_devattr("type", | |
1d892719 JC |
228 | chan, |
229 | &iio_show_fixed_type, | |
230 | NULL, | |
231 | 0, | |
232 | 0, | |
1aa04278 | 233 | &indio_dev->dev, |
14555b14 | 234 | &buffer->scan_el_dev_attr_list); |
1d892719 JC |
235 | if (ret) |
236 | goto error_ret; | |
26d25ae3 | 237 | attrcount++; |
a88b3ebc | 238 | if (chan->type != IIO_TIMESTAMP) |
26d25ae3 | 239 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
240 | chan, |
241 | &iio_scan_el_show, | |
242 | &iio_scan_el_store, | |
243 | chan->scan_index, | |
244 | 0, | |
1aa04278 | 245 | &indio_dev->dev, |
14555b14 | 246 | &buffer->scan_el_dev_attr_list); |
a88b3ebc | 247 | else |
26d25ae3 | 248 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
249 | chan, |
250 | &iio_scan_el_ts_show, | |
251 | &iio_scan_el_ts_store, | |
252 | chan->scan_index, | |
253 | 0, | |
1aa04278 | 254 | &indio_dev->dev, |
14555b14 | 255 | &buffer->scan_el_dev_attr_list); |
26d25ae3 JC |
256 | attrcount++; |
257 | ret = attrcount; | |
1d892719 JC |
258 | error_ret: |
259 | return ret; | |
260 | } | |
261 | ||
14555b14 JC |
262 | static void iio_buffer_remove_and_free_scan_dev_attr(struct iio_dev *indio_dev, |
263 | struct iio_dev_attr *p) | |
1d892719 | 264 | { |
1d892719 JC |
265 | kfree(p->dev_attr.attr.name); |
266 | kfree(p); | |
267 | } | |
268 | ||
14555b14 | 269 | static void __iio_buffer_attr_cleanup(struct iio_dev *indio_dev) |
1d892719 JC |
270 | { |
271 | struct iio_dev_attr *p, *n; | |
14555b14 | 272 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 | 273 | |
1d892719 | 274 | list_for_each_entry_safe(p, n, |
14555b14 JC |
275 | &buffer->scan_el_dev_attr_list, l) |
276 | iio_buffer_remove_and_free_scan_dev_attr(indio_dev, p); | |
1d892719 JC |
277 | } |
278 | ||
26d25ae3 JC |
279 | static const char * const iio_scan_elements_group_name = "scan_elements"; |
280 | ||
14555b14 JC |
281 | int iio_buffer_register(struct iio_dev *indio_dev, |
282 | const struct iio_chan_spec *channels, | |
283 | int num_channels) | |
1d892719 | 284 | { |
26d25ae3 JC |
285 | struct iio_dev_attr *p; |
286 | struct attribute **attr; | |
14555b14 | 287 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 JC |
288 | int ret, i, attrn, attrcount, attrcount_orig = 0; |
289 | ||
14555b14 JC |
290 | if (buffer->attrs) |
291 | indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs; | |
bf32963c | 292 | |
14555b14 JC |
293 | if (buffer->scan_el_attrs != NULL) { |
294 | attr = buffer->scan_el_attrs->attrs; | |
26d25ae3 JC |
295 | while (*attr++ != NULL) |
296 | attrcount_orig++; | |
297 | } | |
298 | attrcount = attrcount_orig; | |
14555b14 | 299 | INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list); |
1d892719 JC |
300 | if (channels) { |
301 | /* new magic */ | |
302 | for (i = 0; i < num_channels; i++) { | |
32b5eeca JC |
303 | /* Establish necessary mask length */ |
304 | if (channels[i].scan_index > | |
305 | (int)indio_dev->masklength - 1) | |
306 | indio_dev->masklength | |
307 | = indio_dev->channels[i].scan_index + 1; | |
308 | ||
14555b14 | 309 | ret = iio_buffer_add_channel_sysfs(indio_dev, |
1aa04278 | 310 | &channels[i]); |
1d892719 | 311 | if (ret < 0) |
26d25ae3 JC |
312 | goto error_cleanup_dynamic; |
313 | attrcount += ret; | |
1d892719 | 314 | } |
14555b14 JC |
315 | if (indio_dev->masklength && buffer->scan_mask == NULL) { |
316 | buffer->scan_mask | |
317 | = kzalloc(sizeof(*buffer->scan_mask)* | |
32b5eeca JC |
318 | BITS_TO_LONGS(indio_dev->masklength), |
319 | GFP_KERNEL); | |
14555b14 | 320 | if (buffer->scan_mask == NULL) { |
32b5eeca | 321 | ret = -ENOMEM; |
26d25ae3 | 322 | goto error_cleanup_dynamic; |
32b5eeca JC |
323 | } |
324 | } | |
1d892719 JC |
325 | } |
326 | ||
14555b14 | 327 | buffer->scan_el_group.name = iio_scan_elements_group_name; |
26d25ae3 | 328 | |
14555b14 JC |
329 | buffer->scan_el_group.attrs |
330 | = kzalloc(sizeof(buffer->scan_el_group.attrs[0])* | |
331 | (attrcount + 1), | |
26d25ae3 | 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 | { |
1aa04278 | 369 | struct iio_dev *indio_dev = dev_get_drvdata(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 JC |
384 | { |
385 | int ret; | |
386 | ulong val; | |
1aa04278 | 387 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 388 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 | 389 | |
7026ea4b JC |
390 | ret = strict_strtoul(buf, 10, &val); |
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 | ||
14555b14 JC |
398 | if (buffer->access->set_length) { |
399 | buffer->access->set_length(buffer, val); | |
400 | if (buffer->access->mark_param_change) | |
401 | buffer->access->mark_param_change(buffer); | |
7026ea4b JC |
402 | } |
403 | ||
404 | return len; | |
405 | } | |
14555b14 | 406 | EXPORT_SYMBOL(iio_buffer_write_length); |
7026ea4b | 407 | |
14555b14 JC |
408 | ssize_t iio_buffer_read_bytes_per_datum(struct device *dev, |
409 | struct device_attribute *attr, | |
410 | char *buf) | |
7026ea4b | 411 | { |
1aa04278 | 412 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 413 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 414 | |
14555b14 | 415 | if (buffer->access->get_bytes_per_datum) |
8d213f24 | 416 | return sprintf(buf, "%d\n", |
14555b14 | 417 | buffer->access->get_bytes_per_datum(buffer)); |
7026ea4b | 418 | |
8d213f24 | 419 | return 0; |
7026ea4b | 420 | } |
14555b14 | 421 | EXPORT_SYMBOL(iio_buffer_read_bytes_per_datum); |
7026ea4b | 422 | |
14555b14 JC |
423 | ssize_t iio_buffer_store_enable(struct device *dev, |
424 | struct device_attribute *attr, | |
425 | const char *buf, | |
426 | size_t len) | |
7026ea4b JC |
427 | { |
428 | int ret; | |
429 | bool requested_state, current_state; | |
430 | int previous_mode; | |
f8c6f4e9 JC |
431 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
432 | struct iio_buffer *buffer = indio_dev->buffer; | |
7026ea4b | 433 | |
f8c6f4e9 JC |
434 | mutex_lock(&indio_dev->mlock); |
435 | previous_mode = indio_dev->currentmode; | |
7026ea4b | 436 | requested_state = !(buf[0] == '0'); |
ec3afa40 | 437 | current_state = !!(previous_mode & INDIO_ALL_BUFFER_MODES); |
7026ea4b | 438 | if (current_state == requested_state) { |
14555b14 | 439 | printk(KERN_INFO "iio-buffer, current state requested again\n"); |
7026ea4b JC |
440 | goto done; |
441 | } | |
442 | if (requested_state) { | |
14555b14 | 443 | if (buffer->setup_ops->preenable) { |
f8c6f4e9 | 444 | ret = buffer->setup_ops->preenable(indio_dev); |
7026ea4b JC |
445 | if (ret) { |
446 | printk(KERN_ERR | |
447 | "Buffer not started:" | |
14555b14 | 448 | "buffer preenable failed\n"); |
7026ea4b JC |
449 | goto error_ret; |
450 | } | |
451 | } | |
14555b14 JC |
452 | if (buffer->access->request_update) { |
453 | ret = buffer->access->request_update(buffer); | |
7026ea4b JC |
454 | if (ret) { |
455 | printk(KERN_INFO | |
456 | "Buffer not started:" | |
14555b14 | 457 | "buffer parameter update failed\n"); |
7026ea4b JC |
458 | goto error_ret; |
459 | } | |
460 | } | |
14555b14 JC |
461 | if (buffer->access->mark_in_use) |
462 | buffer->access->mark_in_use(buffer); | |
7026ea4b | 463 | /* Definitely possible for devices to support both of these.*/ |
f8c6f4e9 JC |
464 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) { |
465 | if (!indio_dev->trig) { | |
7026ea4b JC |
466 | printk(KERN_INFO |
467 | "Buffer not started: no trigger\n"); | |
468 | ret = -EINVAL; | |
14555b14 JC |
469 | if (buffer->access->unmark_in_use) |
470 | buffer->access->unmark_in_use(buffer); | |
7026ea4b JC |
471 | goto error_ret; |
472 | } | |
f8c6f4e9 JC |
473 | indio_dev->currentmode = INDIO_BUFFER_TRIGGERED; |
474 | } else if (indio_dev->modes & INDIO_BUFFER_HARDWARE) | |
475 | indio_dev->currentmode = INDIO_BUFFER_HARDWARE; | |
7026ea4b JC |
476 | else { /* should never be reached */ |
477 | ret = -EINVAL; | |
478 | goto error_ret; | |
479 | } | |
480 | ||
14555b14 | 481 | if (buffer->setup_ops->postenable) { |
f8c6f4e9 | 482 | ret = buffer->setup_ops->postenable(indio_dev); |
7026ea4b JC |
483 | if (ret) { |
484 | printk(KERN_INFO | |
485 | "Buffer not started:" | |
486 | "postenable failed\n"); | |
14555b14 JC |
487 | if (buffer->access->unmark_in_use) |
488 | buffer->access->unmark_in_use(buffer); | |
f8c6f4e9 | 489 | indio_dev->currentmode = previous_mode; |
14555b14 JC |
490 | if (buffer->setup_ops->postdisable) |
491 | buffer->setup_ops-> | |
f8c6f4e9 | 492 | postdisable(indio_dev); |
7026ea4b JC |
493 | goto error_ret; |
494 | } | |
495 | } | |
496 | } else { | |
14555b14 | 497 | if (buffer->setup_ops->predisable) { |
f8c6f4e9 | 498 | ret = buffer->setup_ops->predisable(indio_dev); |
7026ea4b JC |
499 | if (ret) |
500 | goto error_ret; | |
501 | } | |
14555b14 JC |
502 | if (buffer->access->unmark_in_use) |
503 | buffer->access->unmark_in_use(buffer); | |
f8c6f4e9 | 504 | indio_dev->currentmode = INDIO_DIRECT_MODE; |
14555b14 | 505 | if (buffer->setup_ops->postdisable) { |
f8c6f4e9 | 506 | ret = buffer->setup_ops->postdisable(indio_dev); |
7026ea4b JC |
507 | if (ret) |
508 | goto error_ret; | |
509 | } | |
510 | } | |
511 | done: | |
f8c6f4e9 | 512 | mutex_unlock(&indio_dev->mlock); |
7026ea4b JC |
513 | return len; |
514 | ||
515 | error_ret: | |
f8c6f4e9 | 516 | mutex_unlock(&indio_dev->mlock); |
7026ea4b JC |
517 | return ret; |
518 | } | |
14555b14 | 519 | EXPORT_SYMBOL(iio_buffer_store_enable); |
8d213f24 | 520 | |
14555b14 JC |
521 | ssize_t iio_buffer_show_enable(struct device *dev, |
522 | struct device_attribute *attr, | |
523 | char *buf) | |
7026ea4b | 524 | { |
f8c6f4e9 JC |
525 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
526 | return sprintf(buf, "%d\n", !!(indio_dev->currentmode | |
ec3afa40 | 527 | & INDIO_ALL_BUFFER_MODES)); |
7026ea4b | 528 | } |
14555b14 | 529 | EXPORT_SYMBOL(iio_buffer_show_enable); |
7026ea4b | 530 | |
14555b14 | 531 | int iio_sw_buffer_preenable(struct iio_dev *indio_dev) |
5565a450 | 532 | { |
14555b14 | 533 | struct iio_buffer *buffer = indio_dev->buffer; |
5565a450 JC |
534 | size_t size; |
535 | dev_dbg(&indio_dev->dev, "%s\n", __func__); | |
536 | /* Check if there are any scan elements enabled, if not fail*/ | |
14555b14 | 537 | if (!(buffer->scan_count || buffer->scan_timestamp)) |
5565a450 | 538 | return -EINVAL; |
14555b14 JC |
539 | if (buffer->scan_timestamp) |
540 | if (buffer->scan_count) | |
5565a450 | 541 | /* Timestamp (aligned to s64) and data */ |
14555b14 | 542 | size = (((buffer->scan_count * buffer->bpe) |
5565a450 JC |
543 | + sizeof(s64) - 1) |
544 | & ~(sizeof(s64) - 1)) | |
545 | + sizeof(s64); | |
546 | else /* Timestamp only */ | |
547 | size = sizeof(s64); | |
548 | else /* Data only */ | |
14555b14 JC |
549 | size = buffer->scan_count * buffer->bpe; |
550 | buffer->access->set_bytes_per_datum(buffer, size); | |
5565a450 JC |
551 | |
552 | return 0; | |
553 | } | |
14555b14 | 554 | EXPORT_SYMBOL(iio_sw_buffer_preenable); |
32b5eeca JC |
555 | |
556 | ||
557 | /* note NULL used as error indicator as it doesn't make sense. */ | |
558 | static unsigned long *iio_scan_mask_match(unsigned long *av_masks, | |
559 | unsigned int masklength, | |
560 | unsigned long *mask) | |
561 | { | |
562 | if (bitmap_empty(mask, masklength)) | |
563 | return NULL; | |
564 | while (*av_masks) { | |
565 | if (bitmap_subset(mask, av_masks, masklength)) | |
566 | return av_masks; | |
567 | av_masks += BITS_TO_LONGS(masklength); | |
568 | } | |
569 | return NULL; | |
570 | } | |
571 | ||
572 | /** | |
573 | * iio_scan_mask_set() - set particular bit in the scan mask | |
14555b14 | 574 | * @buffer: the buffer whose scan mask we are interested in |
32b5eeca JC |
575 | * @bit: the bit to be set. |
576 | **/ | |
14555b14 | 577 | int iio_scan_mask_set(struct iio_buffer *buffer, int bit) |
32b5eeca | 578 | { |
f8c6f4e9 | 579 | struct iio_dev *indio_dev = buffer->indio_dev; |
32b5eeca JC |
580 | unsigned long *mask; |
581 | unsigned long *trialmask; | |
582 | ||
583 | trialmask = kmalloc(sizeof(*trialmask)* | |
f8c6f4e9 | 584 | BITS_TO_LONGS(indio_dev->masklength), |
32b5eeca JC |
585 | GFP_KERNEL); |
586 | ||
587 | if (trialmask == NULL) | |
588 | return -ENOMEM; | |
f8c6f4e9 | 589 | if (!indio_dev->masklength) { |
14555b14 | 590 | WARN_ON("trying to set scanmask prior to registering buffer\n"); |
32b5eeca JC |
591 | kfree(trialmask); |
592 | return -EINVAL; | |
593 | } | |
f8c6f4e9 | 594 | bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength); |
32b5eeca JC |
595 | set_bit(bit, trialmask); |
596 | ||
f8c6f4e9 JC |
597 | if (indio_dev->available_scan_masks) { |
598 | mask = iio_scan_mask_match(indio_dev->available_scan_masks, | |
599 | indio_dev->masklength, | |
32b5eeca JC |
600 | trialmask); |
601 | if (!mask) { | |
602 | kfree(trialmask); | |
603 | return -EINVAL; | |
604 | } | |
605 | } | |
f8c6f4e9 | 606 | bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength); |
14555b14 | 607 | buffer->scan_count++; |
32b5eeca JC |
608 | |
609 | kfree(trialmask); | |
610 | ||
611 | return 0; | |
612 | }; | |
613 | EXPORT_SYMBOL_GPL(iio_scan_mask_set); | |
614 | ||
14555b14 | 615 | int iio_scan_mask_query(struct iio_buffer *buffer, int bit) |
32b5eeca | 616 | { |
f8c6f4e9 | 617 | struct iio_dev *indio_dev = buffer->indio_dev; |
32b5eeca JC |
618 | long *mask; |
619 | ||
f8c6f4e9 | 620 | if (bit > indio_dev->masklength) |
32b5eeca JC |
621 | return -EINVAL; |
622 | ||
14555b14 | 623 | if (!buffer->scan_mask) |
32b5eeca | 624 | return 0; |
f8c6f4e9 JC |
625 | if (indio_dev->available_scan_masks) |
626 | mask = iio_scan_mask_match(indio_dev->available_scan_masks, | |
627 | indio_dev->masklength, | |
14555b14 | 628 | buffer->scan_mask); |
32b5eeca | 629 | else |
14555b14 | 630 | mask = buffer->scan_mask; |
32b5eeca JC |
631 | if (!mask) |
632 | return 0; | |
633 | ||
634 | return test_bit(bit, mask); | |
635 | }; | |
636 | EXPORT_SYMBOL_GPL(iio_scan_mask_query); |