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 | { |
5ada4ea9 | 90 | INIT_LIST_HEAD(&buffer->demux_list); |
f8c6f4e9 | 91 | buffer->indio_dev = indio_dev; |
14555b14 | 92 | init_waitqueue_head(&buffer->pollq); |
7026ea4b | 93 | } |
14555b14 | 94 | EXPORT_SYMBOL(iio_buffer_init); |
7026ea4b | 95 | |
1d892719 | 96 | static ssize_t iio_show_scan_index(struct device *dev, |
8d213f24 JC |
97 | struct device_attribute *attr, |
98 | char *buf) | |
1d892719 | 99 | { |
8d213f24 | 100 | return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index); |
1d892719 JC |
101 | } |
102 | ||
103 | static ssize_t iio_show_fixed_type(struct device *dev, | |
104 | struct device_attribute *attr, | |
105 | char *buf) | |
106 | { | |
107 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
8310b86c JC |
108 | u8 type = this_attr->c->scan_type.endianness; |
109 | ||
110 | if (type == IIO_CPU) { | |
9d5d1153 JC |
111 | #ifdef __LITTLE_ENDIAN |
112 | type = IIO_LE; | |
113 | #else | |
114 | type = IIO_BE; | |
115 | #endif | |
8310b86c JC |
116 | } |
117 | return sprintf(buf, "%s:%c%d/%d>>%u\n", | |
118 | iio_endian_prefix[type], | |
1d892719 JC |
119 | this_attr->c->scan_type.sign, |
120 | this_attr->c->scan_type.realbits, | |
121 | this_attr->c->scan_type.storagebits, | |
122 | this_attr->c->scan_type.shift); | |
123 | } | |
124 | ||
8d213f24 JC |
125 | static ssize_t iio_scan_el_show(struct device *dev, |
126 | struct device_attribute *attr, | |
127 | char *buf) | |
128 | { | |
129 | int ret; | |
f8c6f4e9 | 130 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
8d213f24 | 131 | |
5ada4ea9 JC |
132 | ret = test_bit(to_iio_dev_attr(attr)->address, |
133 | indio_dev->buffer->scan_mask); | |
134 | ||
8d213f24 JC |
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 | 140 | clear_bit(bit, buffer->scan_mask); |
8d213f24 JC |
141 | return 0; |
142 | } | |
143 | ||
144 | static ssize_t iio_scan_el_store(struct device *dev, | |
145 | struct device_attribute *attr, | |
146 | const char *buf, | |
147 | size_t len) | |
148 | { | |
149 | int ret = 0; | |
150 | bool state; | |
1aa04278 | 151 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 152 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 JC |
153 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
154 | ||
155 | state = !(buf[0] == '0'); | |
156 | mutex_lock(&indio_dev->mlock); | |
ec3afa40 | 157 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { |
8d213f24 JC |
158 | ret = -EBUSY; |
159 | goto error_ret; | |
160 | } | |
14555b14 | 161 | ret = iio_scan_mask_query(buffer, this_attr->address); |
8d213f24 JC |
162 | if (ret < 0) |
163 | goto error_ret; | |
164 | if (!state && ret) { | |
14555b14 | 165 | ret = iio_scan_mask_clear(buffer, this_attr->address); |
8d213f24 JC |
166 | if (ret) |
167 | goto error_ret; | |
168 | } else if (state && !ret) { | |
14555b14 | 169 | ret = iio_scan_mask_set(buffer, this_attr->address); |
8d213f24 JC |
170 | if (ret) |
171 | goto error_ret; | |
172 | } | |
173 | ||
174 | error_ret: | |
175 | mutex_unlock(&indio_dev->mlock); | |
176 | ||
177 | return ret ? ret : len; | |
178 | ||
179 | } | |
180 | ||
181 | static ssize_t iio_scan_el_ts_show(struct device *dev, | |
182 | struct device_attribute *attr, | |
183 | char *buf) | |
184 | { | |
f8c6f4e9 JC |
185 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
186 | return sprintf(buf, "%d\n", indio_dev->buffer->scan_timestamp); | |
8d213f24 JC |
187 | } |
188 | ||
189 | static ssize_t iio_scan_el_ts_store(struct device *dev, | |
190 | struct device_attribute *attr, | |
191 | const char *buf, | |
192 | size_t len) | |
193 | { | |
194 | int ret = 0; | |
1aa04278 | 195 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
8d213f24 | 196 | bool state; |
1aa04278 | 197 | |
8d213f24 JC |
198 | state = !(buf[0] == '0'); |
199 | mutex_lock(&indio_dev->mlock); | |
ec3afa40 | 200 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { |
8d213f24 JC |
201 | ret = -EBUSY; |
202 | goto error_ret; | |
203 | } | |
14555b14 | 204 | indio_dev->buffer->scan_timestamp = state; |
8d213f24 JC |
205 | error_ret: |
206 | mutex_unlock(&indio_dev->mlock); | |
207 | ||
208 | return ret ? ret : len; | |
209 | } | |
210 | ||
14555b14 JC |
211 | static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev, |
212 | const struct iio_chan_spec *chan) | |
1d892719 | 213 | { |
26d25ae3 | 214 | int ret, attrcount = 0; |
14555b14 | 215 | struct iio_buffer *buffer = indio_dev->buffer; |
1d892719 | 216 | |
26d25ae3 | 217 | ret = __iio_add_chan_devattr("index", |
1d892719 JC |
218 | chan, |
219 | &iio_show_scan_index, | |
220 | NULL, | |
221 | 0, | |
222 | 0, | |
1aa04278 | 223 | &indio_dev->dev, |
14555b14 | 224 | &buffer->scan_el_dev_attr_list); |
1d892719 JC |
225 | if (ret) |
226 | goto error_ret; | |
26d25ae3 JC |
227 | attrcount++; |
228 | ret = __iio_add_chan_devattr("type", | |
1d892719 JC |
229 | chan, |
230 | &iio_show_fixed_type, | |
231 | NULL, | |
232 | 0, | |
233 | 0, | |
1aa04278 | 234 | &indio_dev->dev, |
14555b14 | 235 | &buffer->scan_el_dev_attr_list); |
1d892719 JC |
236 | if (ret) |
237 | goto error_ret; | |
26d25ae3 | 238 | attrcount++; |
a88b3ebc | 239 | if (chan->type != IIO_TIMESTAMP) |
26d25ae3 | 240 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
241 | chan, |
242 | &iio_scan_el_show, | |
243 | &iio_scan_el_store, | |
244 | chan->scan_index, | |
245 | 0, | |
1aa04278 | 246 | &indio_dev->dev, |
14555b14 | 247 | &buffer->scan_el_dev_attr_list); |
a88b3ebc | 248 | else |
26d25ae3 | 249 | ret = __iio_add_chan_devattr("en", |
a88b3ebc JC |
250 | chan, |
251 | &iio_scan_el_ts_show, | |
252 | &iio_scan_el_ts_store, | |
253 | chan->scan_index, | |
254 | 0, | |
1aa04278 | 255 | &indio_dev->dev, |
14555b14 | 256 | &buffer->scan_el_dev_attr_list); |
26d25ae3 JC |
257 | attrcount++; |
258 | ret = attrcount; | |
1d892719 JC |
259 | error_ret: |
260 | return ret; | |
261 | } | |
262 | ||
14555b14 JC |
263 | static void iio_buffer_remove_and_free_scan_dev_attr(struct iio_dev *indio_dev, |
264 | struct iio_dev_attr *p) | |
1d892719 | 265 | { |
1d892719 JC |
266 | kfree(p->dev_attr.attr.name); |
267 | kfree(p); | |
268 | } | |
269 | ||
14555b14 | 270 | static void __iio_buffer_attr_cleanup(struct iio_dev *indio_dev) |
1d892719 JC |
271 | { |
272 | struct iio_dev_attr *p, *n; | |
14555b14 | 273 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 | 274 | |
1d892719 | 275 | list_for_each_entry_safe(p, n, |
14555b14 JC |
276 | &buffer->scan_el_dev_attr_list, l) |
277 | iio_buffer_remove_and_free_scan_dev_attr(indio_dev, p); | |
1d892719 JC |
278 | } |
279 | ||
26d25ae3 JC |
280 | static const char * const iio_scan_elements_group_name = "scan_elements"; |
281 | ||
14555b14 JC |
282 | int iio_buffer_register(struct iio_dev *indio_dev, |
283 | const struct iio_chan_spec *channels, | |
284 | int num_channels) | |
1d892719 | 285 | { |
26d25ae3 JC |
286 | struct iio_dev_attr *p; |
287 | struct attribute **attr; | |
14555b14 | 288 | struct iio_buffer *buffer = indio_dev->buffer; |
26d25ae3 JC |
289 | int ret, i, attrn, attrcount, attrcount_orig = 0; |
290 | ||
14555b14 JC |
291 | if (buffer->attrs) |
292 | indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs; | |
bf32963c | 293 | |
14555b14 JC |
294 | if (buffer->scan_el_attrs != NULL) { |
295 | attr = buffer->scan_el_attrs->attrs; | |
26d25ae3 JC |
296 | while (*attr++ != NULL) |
297 | attrcount_orig++; | |
298 | } | |
299 | attrcount = attrcount_orig; | |
14555b14 | 300 | INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list); |
1d892719 JC |
301 | if (channels) { |
302 | /* new magic */ | |
303 | for (i = 0; i < num_channels; i++) { | |
32b5eeca JC |
304 | /* Establish necessary mask length */ |
305 | if (channels[i].scan_index > | |
306 | (int)indio_dev->masklength - 1) | |
307 | indio_dev->masklength | |
308 | = indio_dev->channels[i].scan_index + 1; | |
309 | ||
14555b14 | 310 | ret = iio_buffer_add_channel_sysfs(indio_dev, |
1aa04278 | 311 | &channels[i]); |
1d892719 | 312 | if (ret < 0) |
26d25ae3 JC |
313 | goto error_cleanup_dynamic; |
314 | attrcount += ret; | |
beb80600 JC |
315 | if (channels[i].type == IIO_TIMESTAMP) |
316 | buffer->scan_index_timestamp = | |
317 | channels[i].scan_index; | |
1d892719 | 318 | } |
14555b14 | 319 | if (indio_dev->masklength && buffer->scan_mask == NULL) { |
d83fb184 TM |
320 | buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), |
321 | sizeof(*buffer->scan_mask), | |
322 | GFP_KERNEL); | |
14555b14 | 323 | if (buffer->scan_mask == NULL) { |
32b5eeca | 324 | ret = -ENOMEM; |
26d25ae3 | 325 | goto error_cleanup_dynamic; |
32b5eeca JC |
326 | } |
327 | } | |
1d892719 JC |
328 | } |
329 | ||
14555b14 | 330 | buffer->scan_el_group.name = iio_scan_elements_group_name; |
26d25ae3 | 331 | |
d83fb184 TM |
332 | buffer->scan_el_group.attrs = kcalloc(attrcount + 1, |
333 | sizeof(buffer->scan_el_group.attrs[0]), | |
334 | GFP_KERNEL); | |
14555b14 | 335 | if (buffer->scan_el_group.attrs == NULL) { |
26d25ae3 JC |
336 | ret = -ENOMEM; |
337 | goto error_free_scan_mask; | |
338 | } | |
14555b14 JC |
339 | if (buffer->scan_el_attrs) |
340 | memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs, | |
341 | sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig); | |
26d25ae3 JC |
342 | attrn = attrcount_orig; |
343 | ||
14555b14 JC |
344 | list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l) |
345 | buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr; | |
346 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group; | |
26d25ae3 | 347 | |
1d892719 | 348 | return 0; |
26d25ae3 JC |
349 | |
350 | error_free_scan_mask: | |
14555b14 | 351 | kfree(buffer->scan_mask); |
1d892719 | 352 | error_cleanup_dynamic: |
14555b14 | 353 | __iio_buffer_attr_cleanup(indio_dev); |
26d25ae3 | 354 | |
7026ea4b JC |
355 | return ret; |
356 | } | |
14555b14 | 357 | EXPORT_SYMBOL(iio_buffer_register); |
1d892719 | 358 | |
14555b14 | 359 | void iio_buffer_unregister(struct iio_dev *indio_dev) |
7026ea4b | 360 | { |
14555b14 JC |
361 | kfree(indio_dev->buffer->scan_mask); |
362 | kfree(indio_dev->buffer->scan_el_group.attrs); | |
363 | __iio_buffer_attr_cleanup(indio_dev); | |
7026ea4b | 364 | } |
14555b14 | 365 | EXPORT_SYMBOL(iio_buffer_unregister); |
7026ea4b | 366 | |
14555b14 JC |
367 | ssize_t iio_buffer_read_length(struct device *dev, |
368 | struct device_attribute *attr, | |
369 | char *buf) | |
7026ea4b | 370 | { |
1aa04278 | 371 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 372 | struct iio_buffer *buffer = indio_dev->buffer; |
7026ea4b | 373 | |
14555b14 | 374 | if (buffer->access->get_length) |
8d213f24 | 375 | return sprintf(buf, "%d\n", |
14555b14 | 376 | buffer->access->get_length(buffer)); |
7026ea4b | 377 | |
8d213f24 | 378 | return 0; |
7026ea4b | 379 | } |
14555b14 | 380 | EXPORT_SYMBOL(iio_buffer_read_length); |
7026ea4b | 381 | |
14555b14 JC |
382 | ssize_t iio_buffer_write_length(struct device *dev, |
383 | struct device_attribute *attr, | |
384 | const char *buf, | |
385 | size_t len) | |
7026ea4b JC |
386 | { |
387 | int ret; | |
388 | ulong val; | |
1aa04278 | 389 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
14555b14 | 390 | struct iio_buffer *buffer = indio_dev->buffer; |
8d213f24 | 391 | |
7026ea4b JC |
392 | ret = strict_strtoul(buf, 10, &val); |
393 | if (ret) | |
394 | return ret; | |
395 | ||
14555b14 JC |
396 | if (buffer->access->get_length) |
397 | if (val == buffer->access->get_length(buffer)) | |
7026ea4b JC |
398 | return len; |
399 | ||
14555b14 JC |
400 | if (buffer->access->set_length) { |
401 | buffer->access->set_length(buffer, val); | |
402 | if (buffer->access->mark_param_change) | |
403 | buffer->access->mark_param_change(buffer); | |
7026ea4b JC |
404 | } |
405 | ||
406 | return len; | |
407 | } | |
14555b14 | 408 | EXPORT_SYMBOL(iio_buffer_write_length); |
7026ea4b | 409 | |
14555b14 JC |
410 | ssize_t iio_buffer_store_enable(struct device *dev, |
411 | struct device_attribute *attr, | |
412 | const char *buf, | |
413 | size_t len) | |
7026ea4b JC |
414 | { |
415 | int ret; | |
416 | bool requested_state, current_state; | |
417 | int previous_mode; | |
f8c6f4e9 JC |
418 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
419 | struct iio_buffer *buffer = indio_dev->buffer; | |
7026ea4b | 420 | |
f8c6f4e9 JC |
421 | mutex_lock(&indio_dev->mlock); |
422 | previous_mode = indio_dev->currentmode; | |
7026ea4b | 423 | requested_state = !(buf[0] == '0'); |
ec3afa40 | 424 | current_state = !!(previous_mode & INDIO_ALL_BUFFER_MODES); |
7026ea4b | 425 | if (current_state == requested_state) { |
14555b14 | 426 | printk(KERN_INFO "iio-buffer, current state requested again\n"); |
7026ea4b JC |
427 | goto done; |
428 | } | |
429 | if (requested_state) { | |
1612244f JC |
430 | if (indio_dev->setup_ops->preenable) { |
431 | ret = indio_dev->setup_ops->preenable(indio_dev); | |
7026ea4b JC |
432 | if (ret) { |
433 | printk(KERN_ERR | |
434 | "Buffer not started:" | |
14555b14 | 435 | "buffer preenable failed\n"); |
7026ea4b JC |
436 | goto error_ret; |
437 | } | |
438 | } | |
14555b14 JC |
439 | if (buffer->access->request_update) { |
440 | ret = buffer->access->request_update(buffer); | |
7026ea4b JC |
441 | if (ret) { |
442 | printk(KERN_INFO | |
443 | "Buffer not started:" | |
14555b14 | 444 | "buffer parameter update failed\n"); |
7026ea4b JC |
445 | goto error_ret; |
446 | } | |
447 | } | |
14555b14 JC |
448 | if (buffer->access->mark_in_use) |
449 | buffer->access->mark_in_use(buffer); | |
7026ea4b | 450 | /* Definitely possible for devices to support both of these.*/ |
f8c6f4e9 JC |
451 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) { |
452 | if (!indio_dev->trig) { | |
7026ea4b JC |
453 | printk(KERN_INFO |
454 | "Buffer not started: no trigger\n"); | |
455 | ret = -EINVAL; | |
14555b14 JC |
456 | if (buffer->access->unmark_in_use) |
457 | buffer->access->unmark_in_use(buffer); | |
7026ea4b JC |
458 | goto error_ret; |
459 | } | |
f8c6f4e9 JC |
460 | indio_dev->currentmode = INDIO_BUFFER_TRIGGERED; |
461 | } else if (indio_dev->modes & INDIO_BUFFER_HARDWARE) | |
462 | indio_dev->currentmode = INDIO_BUFFER_HARDWARE; | |
7026ea4b JC |
463 | else { /* should never be reached */ |
464 | ret = -EINVAL; | |
465 | goto error_ret; | |
466 | } | |
467 | ||
1612244f JC |
468 | if (indio_dev->setup_ops->postenable) { |
469 | ret = indio_dev->setup_ops->postenable(indio_dev); | |
7026ea4b JC |
470 | if (ret) { |
471 | printk(KERN_INFO | |
472 | "Buffer not started:" | |
473 | "postenable failed\n"); | |
14555b14 JC |
474 | if (buffer->access->unmark_in_use) |
475 | buffer->access->unmark_in_use(buffer); | |
f8c6f4e9 | 476 | indio_dev->currentmode = previous_mode; |
1612244f JC |
477 | if (indio_dev->setup_ops->postdisable) |
478 | indio_dev->setup_ops-> | |
f8c6f4e9 | 479 | postdisable(indio_dev); |
7026ea4b JC |
480 | goto error_ret; |
481 | } | |
482 | } | |
483 | } else { | |
1612244f JC |
484 | if (indio_dev->setup_ops->predisable) { |
485 | ret = indio_dev->setup_ops->predisable(indio_dev); | |
7026ea4b JC |
486 | if (ret) |
487 | goto error_ret; | |
488 | } | |
14555b14 JC |
489 | if (buffer->access->unmark_in_use) |
490 | buffer->access->unmark_in_use(buffer); | |
f8c6f4e9 | 491 | indio_dev->currentmode = INDIO_DIRECT_MODE; |
1612244f JC |
492 | if (indio_dev->setup_ops->postdisable) { |
493 | ret = indio_dev->setup_ops->postdisable(indio_dev); | |
7026ea4b JC |
494 | if (ret) |
495 | goto error_ret; | |
496 | } | |
497 | } | |
498 | done: | |
f8c6f4e9 | 499 | mutex_unlock(&indio_dev->mlock); |
7026ea4b JC |
500 | return len; |
501 | ||
502 | error_ret: | |
f8c6f4e9 | 503 | mutex_unlock(&indio_dev->mlock); |
7026ea4b JC |
504 | return ret; |
505 | } | |
14555b14 | 506 | EXPORT_SYMBOL(iio_buffer_store_enable); |
8d213f24 | 507 | |
14555b14 JC |
508 | ssize_t iio_buffer_show_enable(struct device *dev, |
509 | struct device_attribute *attr, | |
510 | char *buf) | |
7026ea4b | 511 | { |
f8c6f4e9 JC |
512 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
513 | return sprintf(buf, "%d\n", !!(indio_dev->currentmode | |
ec3afa40 | 514 | & INDIO_ALL_BUFFER_MODES)); |
7026ea4b | 515 | } |
14555b14 | 516 | EXPORT_SYMBOL(iio_buffer_show_enable); |
7026ea4b | 517 | |
32b5eeca JC |
518 | /* note NULL used as error indicator as it doesn't make sense. */ |
519 | static unsigned long *iio_scan_mask_match(unsigned long *av_masks, | |
520 | unsigned int masklength, | |
521 | unsigned long *mask) | |
522 | { | |
523 | if (bitmap_empty(mask, masklength)) | |
524 | return NULL; | |
525 | while (*av_masks) { | |
526 | if (bitmap_subset(mask, av_masks, masklength)) | |
527 | return av_masks; | |
528 | av_masks += BITS_TO_LONGS(masklength); | |
529 | } | |
530 | return NULL; | |
531 | } | |
532 | ||
959d2952 JC |
533 | int iio_sw_buffer_preenable(struct iio_dev *indio_dev) |
534 | { | |
535 | struct iio_buffer *buffer = indio_dev->buffer; | |
536 | const struct iio_chan_spec *ch; | |
537 | unsigned bytes = 0; | |
538 | int length, i; | |
539 | dev_dbg(&indio_dev->dev, "%s\n", __func__); | |
540 | ||
541 | /* How much space will the demuxed element take? */ | |
542 | for_each_set_bit(i, buffer->scan_mask, | |
543 | indio_dev->masklength) { | |
544 | ch = iio_find_channel_from_si(indio_dev, i); | |
545 | length = ch->scan_type.storagebits/8; | |
546 | bytes = ALIGN(bytes, length); | |
547 | bytes += length; | |
548 | } | |
549 | if (buffer->scan_timestamp) { | |
550 | ch = iio_find_channel_from_si(indio_dev, | |
551 | buffer->scan_index_timestamp); | |
552 | length = ch->scan_type.storagebits/8; | |
553 | bytes = ALIGN(bytes, length); | |
554 | bytes += length; | |
555 | } | |
556 | buffer->access->set_bytes_per_datum(buffer, bytes); | |
557 | ||
558 | /* What scan mask do we actually have ?*/ | |
559 | if (indio_dev->available_scan_masks) | |
560 | indio_dev->active_scan_mask = | |
561 | iio_scan_mask_match(indio_dev->available_scan_masks, | |
562 | indio_dev->masklength, | |
563 | buffer->scan_mask); | |
564 | else | |
565 | indio_dev->active_scan_mask = buffer->scan_mask; | |
5ada4ea9 JC |
566 | iio_update_demux(indio_dev); |
567 | ||
568 | if (indio_dev->info->update_scan_mode) | |
569 | return indio_dev->info | |
570 | ->update_scan_mode(indio_dev, | |
571 | indio_dev->active_scan_mask); | |
959d2952 JC |
572 | return 0; |
573 | } | |
574 | EXPORT_SYMBOL(iio_sw_buffer_preenable); | |
575 | ||
32b5eeca JC |
576 | /** |
577 | * iio_scan_mask_set() - set particular bit in the scan mask | |
14555b14 | 578 | * @buffer: the buffer whose scan mask we are interested in |
32b5eeca JC |
579 | * @bit: the bit to be set. |
580 | **/ | |
14555b14 | 581 | int iio_scan_mask_set(struct iio_buffer *buffer, int bit) |
32b5eeca | 582 | { |
f8c6f4e9 | 583 | struct iio_dev *indio_dev = buffer->indio_dev; |
32b5eeca JC |
584 | unsigned long *mask; |
585 | unsigned long *trialmask; | |
586 | ||
587 | trialmask = kmalloc(sizeof(*trialmask)* | |
f8c6f4e9 | 588 | BITS_TO_LONGS(indio_dev->masklength), |
32b5eeca JC |
589 | GFP_KERNEL); |
590 | ||
591 | if (trialmask == NULL) | |
592 | return -ENOMEM; | |
f8c6f4e9 | 593 | if (!indio_dev->masklength) { |
14555b14 | 594 | WARN_ON("trying to set scanmask prior to registering buffer\n"); |
32b5eeca JC |
595 | kfree(trialmask); |
596 | return -EINVAL; | |
597 | } | |
f8c6f4e9 | 598 | bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength); |
32b5eeca JC |
599 | set_bit(bit, trialmask); |
600 | ||
f8c6f4e9 JC |
601 | if (indio_dev->available_scan_masks) { |
602 | mask = iio_scan_mask_match(indio_dev->available_scan_masks, | |
603 | indio_dev->masklength, | |
32b5eeca JC |
604 | trialmask); |
605 | if (!mask) { | |
606 | kfree(trialmask); | |
607 | return -EINVAL; | |
608 | } | |
609 | } | |
f8c6f4e9 | 610 | bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength); |
32b5eeca JC |
611 | |
612 | kfree(trialmask); | |
613 | ||
614 | return 0; | |
615 | }; | |
616 | EXPORT_SYMBOL_GPL(iio_scan_mask_set); | |
617 | ||
14555b14 | 618 | int iio_scan_mask_query(struct iio_buffer *buffer, int bit) |
32b5eeca | 619 | { |
f8c6f4e9 | 620 | struct iio_dev *indio_dev = buffer->indio_dev; |
32b5eeca JC |
621 | long *mask; |
622 | ||
f8c6f4e9 | 623 | if (bit > indio_dev->masklength) |
32b5eeca JC |
624 | return -EINVAL; |
625 | ||
14555b14 | 626 | if (!buffer->scan_mask) |
32b5eeca | 627 | return 0; |
f8c6f4e9 JC |
628 | if (indio_dev->available_scan_masks) |
629 | mask = iio_scan_mask_match(indio_dev->available_scan_masks, | |
630 | indio_dev->masklength, | |
14555b14 | 631 | buffer->scan_mask); |
32b5eeca | 632 | else |
14555b14 | 633 | mask = buffer->scan_mask; |
32b5eeca JC |
634 | if (!mask) |
635 | return 0; | |
636 | ||
637 | return test_bit(bit, mask); | |
638 | }; | |
639 | EXPORT_SYMBOL_GPL(iio_scan_mask_query); | |
5ada4ea9 JC |
640 | |
641 | /** | |
642 | * struct iio_demux_table() - table describing demux memcpy ops | |
643 | * @from: index to copy from | |
644 | * @to: index to copy to | |
645 | * @length: how many bytes to copy | |
646 | * @l: list head used for management | |
647 | */ | |
648 | struct iio_demux_table { | |
649 | unsigned from; | |
650 | unsigned to; | |
651 | unsigned length; | |
652 | struct list_head l; | |
653 | }; | |
654 | ||
655 | static unsigned char *iio_demux(struct iio_buffer *buffer, | |
656 | unsigned char *datain) | |
657 | { | |
658 | struct iio_demux_table *t; | |
659 | ||
660 | if (list_empty(&buffer->demux_list)) | |
661 | return datain; | |
662 | list_for_each_entry(t, &buffer->demux_list, l) | |
663 | memcpy(buffer->demux_bounce + t->to, | |
664 | datain + t->from, t->length); | |
665 | ||
666 | return buffer->demux_bounce; | |
667 | } | |
668 | ||
669 | int iio_push_to_buffer(struct iio_buffer *buffer, unsigned char *data, | |
670 | s64 timestamp) | |
671 | { | |
672 | unsigned char *dataout = iio_demux(buffer, data); | |
673 | ||
674 | return buffer->access->store_to(buffer, dataout, timestamp); | |
675 | } | |
676 | EXPORT_SYMBOL_GPL(iio_push_to_buffer); | |
677 | ||
678 | int iio_update_demux(struct iio_dev *indio_dev) | |
679 | { | |
680 | const struct iio_chan_spec *ch; | |
681 | struct iio_buffer *buffer = indio_dev->buffer; | |
682 | int ret, in_ind = -1, out_ind, length; | |
683 | unsigned in_loc = 0, out_loc = 0; | |
684 | struct iio_demux_table *p, *q; | |
685 | ||
686 | /* Clear out any old demux */ | |
687 | list_for_each_entry_safe(p, q, &buffer->demux_list, l) { | |
688 | list_del(&p->l); | |
689 | kfree(p); | |
690 | } | |
691 | kfree(buffer->demux_bounce); | |
692 | buffer->demux_bounce = NULL; | |
693 | ||
694 | /* First work out which scan mode we will actually have */ | |
695 | if (bitmap_equal(indio_dev->active_scan_mask, | |
696 | buffer->scan_mask, | |
697 | indio_dev->masklength)) | |
698 | return 0; | |
699 | ||
700 | /* Now we have the two masks, work from least sig and build up sizes */ | |
701 | for_each_set_bit(out_ind, | |
702 | indio_dev->active_scan_mask, | |
703 | indio_dev->masklength) { | |
704 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
705 | indio_dev->masklength, | |
706 | in_ind + 1); | |
707 | while (in_ind != out_ind) { | |
708 | in_ind = find_next_bit(indio_dev->active_scan_mask, | |
709 | indio_dev->masklength, | |
710 | in_ind + 1); | |
711 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
712 | length = ch->scan_type.storagebits/8; | |
713 | /* Make sure we are aligned */ | |
714 | in_loc += length; | |
715 | if (in_loc % length) | |
716 | in_loc += length - in_loc % length; | |
717 | } | |
718 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
719 | if (p == NULL) { | |
720 | ret = -ENOMEM; | |
721 | goto error_clear_mux_table; | |
722 | } | |
723 | ch = iio_find_channel_from_si(indio_dev, in_ind); | |
724 | length = ch->scan_type.storagebits/8; | |
725 | if (out_loc % length) | |
726 | out_loc += length - out_loc % length; | |
727 | if (in_loc % length) | |
728 | in_loc += length - in_loc % length; | |
729 | p->from = in_loc; | |
730 | p->to = out_loc; | |
731 | p->length = length; | |
732 | list_add_tail(&p->l, &buffer->demux_list); | |
733 | out_loc += length; | |
734 | in_loc += length; | |
735 | } | |
736 | /* Relies on scan_timestamp being last */ | |
737 | if (buffer->scan_timestamp) { | |
738 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
739 | if (p == NULL) { | |
740 | ret = -ENOMEM; | |
741 | goto error_clear_mux_table; | |
742 | } | |
743 | ch = iio_find_channel_from_si(indio_dev, | |
744 | buffer->scan_index_timestamp); | |
745 | length = ch->scan_type.storagebits/8; | |
746 | if (out_loc % length) | |
747 | out_loc += length - out_loc % length; | |
748 | if (in_loc % length) | |
749 | in_loc += length - in_loc % length; | |
750 | p->from = in_loc; | |
751 | p->to = out_loc; | |
752 | p->length = length; | |
753 | list_add_tail(&p->l, &buffer->demux_list); | |
754 | out_loc += length; | |
755 | in_loc += length; | |
756 | } | |
757 | buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL); | |
758 | if (buffer->demux_bounce == NULL) { | |
759 | ret = -ENOMEM; | |
760 | goto error_clear_mux_table; | |
761 | } | |
762 | return 0; | |
763 | ||
764 | error_clear_mux_table: | |
765 | list_for_each_entry_safe(p, q, &buffer->demux_list, l) { | |
766 | list_del(&p->l); | |
767 | kfree(p); | |
768 | } | |
769 | return ret; | |
770 | } | |
771 | EXPORT_SYMBOL_GPL(iio_update_demux); |