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 | ||
30eb82f0 | 67 | int iio_chrdev_buffer_open(struct iio_dev *indio_dev) |
7026ea4b | 68 | { |
14555b14 | 69 | struct iio_buffer *rb = indio_dev->buffer; |
30eb82f0 | 70 | if (!rb) |
96e00f11 | 71 | return 0; |
30eb82f0 | 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 | |
96e00f11 JC |
81 | if (!rb) |
82 | return; | |
1aa04278 JC |
83 | clear_bit(IIO_BUSY_BIT_POS, &rb->flags); |
84 | if (rb->access->unmark_in_use) | |
85 | rb->access->unmark_in_use(rb); | |
7026ea4b JC |
86 | } |
87 | ||
f8c6f4e9 | 88 | void iio_buffer_init(struct iio_buffer *buffer, struct iio_dev *indio_dev) |
7026ea4b | 89 | { |
f8c6f4e9 | 90 | buffer->indio_dev = indio_dev; |
14555b14 | 91 | init_waitqueue_head(&buffer->pollq); |
7026ea4b | 92 | } |
14555b14 | 93 | EXPORT_SYMBOL(iio_buffer_init); |
7026ea4b | 94 | |
1d892719 | 95 | static ssize_t iio_show_scan_index(struct device *dev, |
8d213f24 JC |
96 | struct device_attribute *attr, |
97 | char *buf) | |
1d892719 | 98 | { |
8d213f24 | 99 | return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index); |
1d892719 JC |
100 | } |
101 | ||
102 | static ssize_t iio_show_fixed_type(struct device *dev, | |
103 | struct device_attribute *attr, | |
104 | char *buf) | |
105 | { | |
106 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
8310b86c JC |
107 | u8 type = this_attr->c->scan_type.endianness; |
108 | ||
109 | if (type == IIO_CPU) { | |
9d5d1153 JC |
110 | #ifdef __LITTLE_ENDIAN |
111 | type = IIO_LE; | |
112 | #else | |
113 | type = IIO_BE; | |
114 | #endif | |
8310b86c JC |
115 | } |
116 | return sprintf(buf, "%s:%c%d/%d>>%u\n", | |
117 | iio_endian_prefix[type], | |
1d892719 JC |
118 | this_attr->c->scan_type.sign, |
119 | this_attr->c->scan_type.realbits, | |
120 | this_attr->c->scan_type.storagebits, | |
121 | this_attr->c->scan_type.shift); | |
122 | } | |
123 | ||
8d213f24 JC |
124 | static ssize_t iio_scan_el_show(struct device *dev, |
125 | struct device_attribute *attr, | |
126 | char *buf) | |
127 | { | |
128 | int ret; | |
f8c6f4e9 | 129 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
8d213f24 | 130 | |
f8c6f4e9 | 131 | ret = iio_scan_mask_query(indio_dev->buffer, |
1aa04278 | 132 | to_iio_dev_attr(attr)->address); |
8d213f24 JC |
133 | if (ret < 0) |
134 | return ret; | |
135 | return sprintf(buf, "%d\n", ret); | |
136 | } | |
137 | ||
14555b14 | 138 | static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit) |
8d213f24 | 139 | { |
14555b14 JC |
140 | clear_bit(bit, buffer->scan_mask); |
141 | buffer->scan_count--; | |
8d213f24 JC |
142 | return 0; |
143 | } | |
144 | ||
145 | static ssize_t iio_scan_el_store(struct device *dev, | |
146 | struct device_attribute *attr, | |
147 | const char *buf, | |
148 | size_t len) | |
149 | { | |
150 | int ret = 0; | |
151 | bool state; | |
1aa04278 | 152 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 153 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 JC |
154 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
155 | ||
156 | state = !(buf[0] == '0'); | |
157 | mutex_lock(&indio_dev->mlock); | |
ec3afa40 | 158 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { |
8d213f24 JC |
159 | ret = -EBUSY; |
160 | goto error_ret; | |
161 | } | |
14555b14 | 162 | ret = iio_scan_mask_query(buffer, this_attr->address); |
8d213f24 JC |
163 | if (ret < 0) |
164 | goto error_ret; | |
165 | if (!state && ret) { | |
14555b14 | 166 | ret = iio_scan_mask_clear(buffer, this_attr->address); |
8d213f24 JC |
167 | if (ret) |
168 | goto error_ret; | |
169 | } else if (state && !ret) { | |
14555b14 | 170 | ret = iio_scan_mask_set(buffer, this_attr->address); |
8d213f24 JC |
171 | if (ret) |
172 | goto error_ret; | |
173 | } | |
174 | ||
175 | error_ret: | |
176 | mutex_unlock(&indio_dev->mlock); | |
177 | ||
178 | return ret ? ret : len; | |
179 | ||
180 | } | |
181 | ||
182 | static ssize_t iio_scan_el_ts_show(struct device *dev, | |
183 | struct device_attribute *attr, | |
184 | char *buf) | |
185 | { | |
f8c6f4e9 JC |
186 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
187 | return sprintf(buf, "%d\n", indio_dev->buffer->scan_timestamp); | |
8d213f24 JC |
188 | } |
189 | ||
190 | static ssize_t iio_scan_el_ts_store(struct device *dev, | |
191 | struct device_attribute *attr, | |
192 | const char *buf, | |
193 | size_t len) | |
194 | { | |
195 | int ret = 0; | |
1aa04278 | 196 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
8d213f24 | 197 | bool state; |
1aa04278 | 198 | |
8d213f24 JC |
199 | state = !(buf[0] == '0'); |
200 | mutex_lock(&indio_dev->mlock); | |
ec3afa40 | 201 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { |
8d213f24 JC |
202 | ret = -EBUSY; |
203 | goto error_ret; | |
204 | } | |
14555b14 | 205 | indio_dev->buffer->scan_timestamp = state; |
8d213f24 JC |
206 | error_ret: |
207 | mutex_unlock(&indio_dev->mlock); | |
208 | ||
209 | return ret ? ret : len; | |
210 | } | |
211 | ||
14555b14 JC |
212 | static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev, |
213 | const struct iio_chan_spec *chan) | |
1d892719 | 214 | { |
26d25ae3 | 215 | int ret, attrcount = 0; |
14555b14 | 216 | struct iio_buffer *buffer = indio_dev->buffer; |
1d892719 | 217 | |
26d25ae3 | 218 | ret = __iio_add_chan_devattr("index", |
1d892719 JC |
219 | chan, |
220 | &iio_show_scan_index, | |
221 | NULL, | |
222 | 0, | |
223 | 0, | |
1aa04278 | 224 | &indio_dev->dev, |
14555b14 | 225 | &buffer->scan_el_dev_attr_list); |
1d892719 JC |
226 | if (ret) |
227 | goto error_ret; | |
26d25ae3 JC |
228 | attrcount++; |
229 | ret = __iio_add_chan_devattr("type", | |
1d892719 JC |
230 | chan, |
231 | &iio_show_fixed_type, | |
232 | NULL, | |
233 | 0, | |
234 | 0, | |
1aa04278 | 235 | &indio_dev->dev, |
14555b14 | 236 | &buffer->scan_el_dev_attr_list); |
1d892719 JC |
237 | if (ret) |
238 | goto error_ret; | |
26d25ae3 | 239 | attrcount++; |
a88b3ebc | 240 | if (chan->type != IIO_TIMESTAMP) |
26d25ae3 | 241 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
242 | chan, |
243 | &iio_scan_el_show, | |
244 | &iio_scan_el_store, | |
245 | chan->scan_index, | |
246 | 0, | |
1aa04278 | 247 | &indio_dev->dev, |
14555b14 | 248 | &buffer->scan_el_dev_attr_list); |
a88b3ebc | 249 | else |
26d25ae3 | 250 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
251 | chan, |
252 | &iio_scan_el_ts_show, | |
253 | &iio_scan_el_ts_store, | |
254 | chan->scan_index, | |
255 | 0, | |
1aa04278 | 256 | &indio_dev->dev, |
14555b14 | 257 | &buffer->scan_el_dev_attr_list); |
26d25ae3 JC |
258 | attrcount++; |
259 | ret = attrcount; | |
1d892719 JC |
260 | error_ret: |
261 | return ret; | |
262 | } | |
263 | ||
14555b14 JC |
264 | static void iio_buffer_remove_and_free_scan_dev_attr(struct iio_dev *indio_dev, |
265 | struct iio_dev_attr *p) | |
1d892719 | 266 | { |
1d892719 JC |
267 | kfree(p->dev_attr.attr.name); |
268 | kfree(p); | |
269 | } | |
270 | ||
14555b14 | 271 | static void __iio_buffer_attr_cleanup(struct iio_dev *indio_dev) |
1d892719 JC |
272 | { |
273 | struct iio_dev_attr *p, *n; | |
14555b14 | 274 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 | 275 | |
1d892719 | 276 | list_for_each_entry_safe(p, n, |
14555b14 JC |
277 | &buffer->scan_el_dev_attr_list, l) |
278 | iio_buffer_remove_and_free_scan_dev_attr(indio_dev, p); | |
1d892719 JC |
279 | } |
280 | ||
26d25ae3 JC |
281 | static const char * const iio_scan_elements_group_name = "scan_elements"; |
282 | ||
14555b14 JC |
283 | int iio_buffer_register(struct iio_dev *indio_dev, |
284 | const struct iio_chan_spec *channels, | |
285 | int num_channels) | |
1d892719 | 286 | { |
26d25ae3 JC |
287 | struct iio_dev_attr *p; |
288 | struct attribute **attr; | |
14555b14 | 289 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 JC |
290 | int ret, i, attrn, attrcount, attrcount_orig = 0; |
291 | ||
14555b14 JC |
292 | if (buffer->attrs) |
293 | indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs; | |
bf32963c | 294 | |
14555b14 JC |
295 | if (buffer->scan_el_attrs != NULL) { |
296 | attr = buffer->scan_el_attrs->attrs; | |
26d25ae3 JC |
297 | while (*attr++ != NULL) |
298 | attrcount_orig++; | |
299 | } | |
300 | attrcount = attrcount_orig; | |
14555b14 | 301 | INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list); |
1d892719 JC |
302 | if (channels) { |
303 | /* new magic */ | |
304 | for (i = 0; i < num_channels; i++) { | |
32b5eeca JC |
305 | /* Establish necessary mask length */ |
306 | if (channels[i].scan_index > | |
307 | (int)indio_dev->masklength - 1) | |
308 | indio_dev->masklength | |
309 | = indio_dev->channels[i].scan_index + 1; | |
310 | ||
14555b14 | 311 | ret = iio_buffer_add_channel_sysfs(indio_dev, |
1aa04278 | 312 | &channels[i]); |
1d892719 | 313 | if (ret < 0) |
26d25ae3 JC |
314 | goto error_cleanup_dynamic; |
315 | attrcount += ret; | |
beb80600 JC |
316 | if (channels[i].type == IIO_TIMESTAMP) |
317 | buffer->scan_index_timestamp = | |
318 | channels[i].scan_index; | |
1d892719 | 319 | } |
14555b14 | 320 | if (indio_dev->masklength && buffer->scan_mask == NULL) { |
d83fb184 TM |
321 | buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), |
322 | sizeof(*buffer->scan_mask), | |
323 | GFP_KERNEL); | |
14555b14 | 324 | if (buffer->scan_mask == NULL) { |
32b5eeca | 325 | ret = -ENOMEM; |
26d25ae3 | 326 | goto error_cleanup_dynamic; |
32b5eeca JC |
327 | } |
328 | } | |
1d892719 JC |
329 | } |
330 | ||
14555b14 | 331 | buffer->scan_el_group.name = iio_scan_elements_group_name; |
26d25ae3 | 332 | |
d83fb184 TM |
333 | buffer->scan_el_group.attrs = kcalloc(attrcount + 1, |
334 | sizeof(buffer->scan_el_group.attrs[0]), | |
335 | GFP_KERNEL); | |
14555b14 | 336 | if (buffer->scan_el_group.attrs == NULL) { |
26d25ae3 JC |
337 | ret = -ENOMEM; |
338 | goto error_free_scan_mask; | |
339 | } | |
14555b14 JC |
340 | if (buffer->scan_el_attrs) |
341 | memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs, | |
342 | sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig); | |
26d25ae3 JC |
343 | attrn = attrcount_orig; |
344 | ||
14555b14 JC |
345 | list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l) |
346 | buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr; | |
347 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group; | |
26d25ae3 | 348 | |
1d892719 | 349 | return 0; |
26d25ae3 JC |
350 | |
351 | error_free_scan_mask: | |
14555b14 | 352 | kfree(buffer->scan_mask); |
1d892719 | 353 | error_cleanup_dynamic: |
14555b14 | 354 | __iio_buffer_attr_cleanup(indio_dev); |
26d25ae3 | 355 | |
7026ea4b JC |
356 | return ret; |
357 | } | |
14555b14 | 358 | EXPORT_SYMBOL(iio_buffer_register); |
1d892719 | 359 | |
14555b14 | 360 | void iio_buffer_unregister(struct iio_dev *indio_dev) |
7026ea4b | 361 | { |
14555b14 JC |
362 | kfree(indio_dev->buffer->scan_mask); |
363 | kfree(indio_dev->buffer->scan_el_group.attrs); | |
364 | __iio_buffer_attr_cleanup(indio_dev); | |
7026ea4b | 365 | } |
14555b14 | 366 | EXPORT_SYMBOL(iio_buffer_unregister); |
7026ea4b | 367 | |
14555b14 JC |
368 | ssize_t iio_buffer_read_length(struct device *dev, |
369 | struct device_attribute *attr, | |
370 | char *buf) | |
7026ea4b | 371 | { |
1aa04278 | 372 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 373 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 374 | |
14555b14 | 375 | if (buffer->access->get_length) |
8d213f24 | 376 | return sprintf(buf, "%d\n", |
14555b14 | 377 | buffer->access->get_length(buffer)); |
7026ea4b | 378 | |
8d213f24 | 379 | return 0; |
7026ea4b | 380 | } |
14555b14 | 381 | EXPORT_SYMBOL(iio_buffer_read_length); |
7026ea4b | 382 | |
14555b14 JC |
383 | ssize_t iio_buffer_write_length(struct device *dev, |
384 | struct device_attribute *attr, | |
385 | const char *buf, | |
386 | size_t len) | |
7026ea4b JC |
387 | { |
388 | int ret; | |
389 | ulong val; | |
1aa04278 | 390 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 391 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 | 392 | |
7026ea4b JC |
393 | ret = strict_strtoul(buf, 10, &val); |
394 | if (ret) | |
395 | return ret; | |
396 | ||
14555b14 JC |
397 | if (buffer->access->get_length) |
398 | if (val == buffer->access->get_length(buffer)) | |
7026ea4b JC |
399 | return len; |
400 | ||
14555b14 JC |
401 | if (buffer->access->set_length) { |
402 | buffer->access->set_length(buffer, val); | |
403 | if (buffer->access->mark_param_change) | |
404 | buffer->access->mark_param_change(buffer); | |
7026ea4b JC |
405 | } |
406 | ||
407 | return len; | |
408 | } | |
14555b14 | 409 | EXPORT_SYMBOL(iio_buffer_write_length); |
7026ea4b | 410 | |
14555b14 JC |
411 | ssize_t iio_buffer_read_bytes_per_datum(struct device *dev, |
412 | struct device_attribute *attr, | |
413 | char *buf) | |
7026ea4b | 414 | { |
1aa04278 | 415 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 416 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 417 | |
14555b14 | 418 | if (buffer->access->get_bytes_per_datum) |
8d213f24 | 419 | return sprintf(buf, "%d\n", |
14555b14 | 420 | buffer->access->get_bytes_per_datum(buffer)); |
7026ea4b | 421 | |
8d213f24 | 422 | return 0; |
7026ea4b | 423 | } |
14555b14 | 424 | EXPORT_SYMBOL(iio_buffer_read_bytes_per_datum); |
7026ea4b | 425 | |
14555b14 JC |
426 | ssize_t iio_buffer_store_enable(struct device *dev, |
427 | struct device_attribute *attr, | |
428 | const char *buf, | |
429 | size_t len) | |
7026ea4b JC |
430 | { |
431 | int ret; | |
432 | bool requested_state, current_state; | |
433 | int previous_mode; | |
f8c6f4e9 JC |
434 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
435 | struct iio_buffer *buffer = indio_dev->buffer; | |
7026ea4b | 436 | |
f8c6f4e9 JC |
437 | mutex_lock(&indio_dev->mlock); |
438 | previous_mode = indio_dev->currentmode; | |
7026ea4b | 439 | requested_state = !(buf[0] == '0'); |
ec3afa40 | 440 | current_state = !!(previous_mode & INDIO_ALL_BUFFER_MODES); |
7026ea4b | 441 | if (current_state == requested_state) { |
14555b14 | 442 | printk(KERN_INFO "iio-buffer, current state requested again\n"); |
7026ea4b JC |
443 | goto done; |
444 | } | |
445 | if (requested_state) { | |
14555b14 | 446 | if (buffer->setup_ops->preenable) { |
f8c6f4e9 | 447 | ret = buffer->setup_ops->preenable(indio_dev); |
7026ea4b JC |
448 | if (ret) { |
449 | printk(KERN_ERR | |
450 | "Buffer not started:" | |
14555b14 | 451 | "buffer preenable failed\n"); |
7026ea4b JC |
452 | goto error_ret; |
453 | } | |
454 | } | |
14555b14 JC |
455 | if (buffer->access->request_update) { |
456 | ret = buffer->access->request_update(buffer); | |
7026ea4b JC |
457 | if (ret) { |
458 | printk(KERN_INFO | |
459 | "Buffer not started:" | |
14555b14 | 460 | "buffer parameter update failed\n"); |
7026ea4b JC |
461 | goto error_ret; |
462 | } | |
463 | } | |
14555b14 JC |
464 | if (buffer->access->mark_in_use) |
465 | buffer->access->mark_in_use(buffer); | |
7026ea4b | 466 | /* Definitely possible for devices to support both of these.*/ |
f8c6f4e9 JC |
467 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) { |
468 | if (!indio_dev->trig) { | |
7026ea4b JC |
469 | printk(KERN_INFO |
470 | "Buffer not started: no trigger\n"); | |
471 | ret = -EINVAL; | |
14555b14 JC |
472 | if (buffer->access->unmark_in_use) |
473 | buffer->access->unmark_in_use(buffer); | |
7026ea4b JC |
474 | goto error_ret; |
475 | } | |
f8c6f4e9 JC |
476 | indio_dev->currentmode = INDIO_BUFFER_TRIGGERED; |
477 | } else if (indio_dev->modes & INDIO_BUFFER_HARDWARE) | |
478 | indio_dev->currentmode = INDIO_BUFFER_HARDWARE; | |
7026ea4b JC |
479 | else { /* should never be reached */ |
480 | ret = -EINVAL; | |
481 | goto error_ret; | |
482 | } | |
483 | ||
14555b14 | 484 | if (buffer->setup_ops->postenable) { |
f8c6f4e9 | 485 | ret = buffer->setup_ops->postenable(indio_dev); |
7026ea4b JC |
486 | if (ret) { |
487 | printk(KERN_INFO | |
488 | "Buffer not started:" | |
489 | "postenable failed\n"); | |
14555b14 JC |
490 | if (buffer->access->unmark_in_use) |
491 | buffer->access->unmark_in_use(buffer); | |
f8c6f4e9 | 492 | indio_dev->currentmode = previous_mode; |
14555b14 JC |
493 | if (buffer->setup_ops->postdisable) |
494 | buffer->setup_ops-> | |
f8c6f4e9 | 495 | postdisable(indio_dev); |
7026ea4b JC |
496 | goto error_ret; |
497 | } | |
498 | } | |
499 | } else { | |
14555b14 | 500 | if (buffer->setup_ops->predisable) { |
f8c6f4e9 | 501 | ret = buffer->setup_ops->predisable(indio_dev); |
7026ea4b JC |
502 | if (ret) |
503 | goto error_ret; | |
504 | } | |
14555b14 JC |
505 | if (buffer->access->unmark_in_use) |
506 | buffer->access->unmark_in_use(buffer); | |
f8c6f4e9 | 507 | indio_dev->currentmode = INDIO_DIRECT_MODE; |
14555b14 | 508 | if (buffer->setup_ops->postdisable) { |
f8c6f4e9 | 509 | ret = buffer->setup_ops->postdisable(indio_dev); |
7026ea4b JC |
510 | if (ret) |
511 | goto error_ret; | |
512 | } | |
513 | } | |
514 | done: | |
f8c6f4e9 | 515 | mutex_unlock(&indio_dev->mlock); |
7026ea4b JC |
516 | return len; |
517 | ||
518 | error_ret: | |
f8c6f4e9 | 519 | mutex_unlock(&indio_dev->mlock); |
7026ea4b JC |
520 | return ret; |
521 | } | |
14555b14 | 522 | EXPORT_SYMBOL(iio_buffer_store_enable); |
8d213f24 | 523 | |
14555b14 JC |
524 | ssize_t iio_buffer_show_enable(struct device *dev, |
525 | struct device_attribute *attr, | |
526 | char *buf) | |
7026ea4b | 527 | { |
f8c6f4e9 JC |
528 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
529 | return sprintf(buf, "%d\n", !!(indio_dev->currentmode | |
ec3afa40 | 530 | & INDIO_ALL_BUFFER_MODES)); |
7026ea4b | 531 | } |
14555b14 | 532 | EXPORT_SYMBOL(iio_buffer_show_enable); |
7026ea4b | 533 | |
32b5eeca JC |
534 | /* note NULL used as error indicator as it doesn't make sense. */ |
535 | static unsigned long *iio_scan_mask_match(unsigned long *av_masks, | |
536 | unsigned int masklength, | |
537 | unsigned long *mask) | |
538 | { | |
539 | if (bitmap_empty(mask, masklength)) | |
540 | return NULL; | |
541 | while (*av_masks) { | |
542 | if (bitmap_subset(mask, av_masks, masklength)) | |
543 | return av_masks; | |
544 | av_masks += BITS_TO_LONGS(masklength); | |
545 | } | |
546 | return NULL; | |
547 | } | |
548 | ||
959d2952 JC |
549 | int iio_sw_buffer_preenable(struct iio_dev *indio_dev) |
550 | { | |
551 | struct iio_buffer *buffer = indio_dev->buffer; | |
552 | const struct iio_chan_spec *ch; | |
553 | unsigned bytes = 0; | |
554 | int length, i; | |
555 | dev_dbg(&indio_dev->dev, "%s\n", __func__); | |
556 | ||
557 | /* How much space will the demuxed element take? */ | |
558 | for_each_set_bit(i, buffer->scan_mask, | |
559 | indio_dev->masklength) { | |
560 | ch = iio_find_channel_from_si(indio_dev, i); | |
561 | length = ch->scan_type.storagebits/8; | |
562 | bytes = ALIGN(bytes, length); | |
563 | bytes += length; | |
564 | } | |
565 | if (buffer->scan_timestamp) { | |
566 | ch = iio_find_channel_from_si(indio_dev, | |
567 | buffer->scan_index_timestamp); | |
568 | length = ch->scan_type.storagebits/8; | |
569 | bytes = ALIGN(bytes, length); | |
570 | bytes += length; | |
571 | } | |
572 | buffer->access->set_bytes_per_datum(buffer, bytes); | |
573 | ||
574 | /* What scan mask do we actually have ?*/ | |
575 | if (indio_dev->available_scan_masks) | |
576 | indio_dev->active_scan_mask = | |
577 | iio_scan_mask_match(indio_dev->available_scan_masks, | |
578 | indio_dev->masklength, | |
579 | buffer->scan_mask); | |
580 | else | |
581 | indio_dev->active_scan_mask = buffer->scan_mask; | |
582 | return 0; | |
583 | } | |
584 | EXPORT_SYMBOL(iio_sw_buffer_preenable); | |
585 | ||
32b5eeca JC |
586 | /** |
587 | * iio_scan_mask_set() - set particular bit in the scan mask | |
14555b14 | 588 | * @buffer: the buffer whose scan mask we are interested in |
32b5eeca JC |
589 | * @bit: the bit to be set. |
590 | **/ | |
14555b14 | 591 | int iio_scan_mask_set(struct iio_buffer *buffer, int bit) |
32b5eeca | 592 | { |
f8c6f4e9 | 593 | struct iio_dev *indio_dev = buffer->indio_dev; |
32b5eeca JC |
594 | unsigned long *mask; |
595 | unsigned long *trialmask; | |
596 | ||
597 | trialmask = kmalloc(sizeof(*trialmask)* | |
f8c6f4e9 | 598 | BITS_TO_LONGS(indio_dev->masklength), |
32b5eeca JC |
599 | GFP_KERNEL); |
600 | ||
601 | if (trialmask == NULL) | |
602 | return -ENOMEM; | |
f8c6f4e9 | 603 | if (!indio_dev->masklength) { |
14555b14 | 604 | WARN_ON("trying to set scanmask prior to registering buffer\n"); |
32b5eeca JC |
605 | kfree(trialmask); |
606 | return -EINVAL; | |
607 | } | |
f8c6f4e9 | 608 | bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength); |
32b5eeca JC |
609 | set_bit(bit, trialmask); |
610 | ||
f8c6f4e9 JC |
611 | if (indio_dev->available_scan_masks) { |
612 | mask = iio_scan_mask_match(indio_dev->available_scan_masks, | |
613 | indio_dev->masklength, | |
32b5eeca JC |
614 | trialmask); |
615 | if (!mask) { | |
616 | kfree(trialmask); | |
617 | return -EINVAL; | |
618 | } | |
619 | } | |
f8c6f4e9 | 620 | bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength); |
14555b14 | 621 | buffer->scan_count++; |
32b5eeca JC |
622 | |
623 | kfree(trialmask); | |
624 | ||
625 | return 0; | |
626 | }; | |
627 | EXPORT_SYMBOL_GPL(iio_scan_mask_set); | |
628 | ||
14555b14 | 629 | int iio_scan_mask_query(struct iio_buffer *buffer, int bit) |
32b5eeca | 630 | { |
f8c6f4e9 | 631 | struct iio_dev *indio_dev = buffer->indio_dev; |
32b5eeca JC |
632 | long *mask; |
633 | ||
f8c6f4e9 | 634 | if (bit > indio_dev->masklength) |
32b5eeca JC |
635 | return -EINVAL; |
636 | ||
14555b14 | 637 | if (!buffer->scan_mask) |
32b5eeca | 638 | return 0; |
f8c6f4e9 JC |
639 | if (indio_dev->available_scan_masks) |
640 | mask = iio_scan_mask_match(indio_dev->available_scan_masks, | |
641 | indio_dev->masklength, | |
14555b14 | 642 | buffer->scan_mask); |
32b5eeca | 643 | else |
14555b14 | 644 | mask = buffer->scan_mask; |
32b5eeca JC |
645 | if (!mask) |
646 | return 0; | |
647 | ||
648 | return test_bit(bit, mask); | |
649 | }; | |
650 | EXPORT_SYMBOL_GPL(iio_scan_mask_query); |