Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 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 | * |
| 9 | * Handling of buffer allocation / resizing. |
| 10 | * |
| 11 | * |
| 12 | * Things to look at here. |
| 13 | * - Better memory allocation techniques? |
| 14 | * - Alternative access techniques? |
| 15 | */ |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <linux/fs.h> |
| 19 | #include <linux/cdev.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/poll.h> |
| 22 | |
| 23 | #include "iio.h" |
| 24 | #include "iio_core.h" |
| 25 | #include "sysfs.h" |
| 26 | #include "buffer_generic.h" |
| 27 | |
| 28 | static const char * const iio_endian_prefix[] = { |
| 29 | [IIO_BE] = "be", |
| 30 | [IIO_LE] = "le", |
| 31 | }; |
| 32 | |
| 33 | /** |
| 34 | * iio_buffer_read_first_n_outer() - chrdev read for buffer access |
| 35 | * |
| 36 | * This function relies on all buffer implementations having an |
| 37 | * iio_buffer as their first element. |
| 38 | **/ |
| 39 | ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf, |
| 40 | size_t n, loff_t *f_ps) |
| 41 | { |
| 42 | struct iio_dev *indio_dev = filp->private_data; |
| 43 | struct iio_buffer *rb = indio_dev->buffer; |
| 44 | |
| 45 | if (!rb->access->read_first_n) |
| 46 | return -EINVAL; |
| 47 | return rb->access->read_first_n(rb, n, buf); |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * iio_buffer_poll() - poll the buffer to find out if it has data |
| 52 | */ |
| 53 | unsigned int iio_buffer_poll(struct file *filp, |
| 54 | struct poll_table_struct *wait) |
| 55 | { |
| 56 | struct iio_dev *indio_dev = filp->private_data; |
| 57 | struct iio_buffer *rb = indio_dev->buffer; |
| 58 | |
| 59 | poll_wait(filp, &rb->pollq, wait); |
| 60 | if (rb->stufftoread) |
| 61 | return POLLIN | POLLRDNORM; |
| 62 | /* need a way of knowing if there may be enough data... */ |
| 63 | return 0; |
| 64 | } |
| 65 | |
Jonathan Cameron | 30eb82f | 2011-09-21 11:16:02 +0100 | [diff] [blame^] | 66 | int iio_chrdev_buffer_open(struct iio_dev *indio_dev) |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 67 | { |
| 68 | struct iio_buffer *rb = indio_dev->buffer; |
Jonathan Cameron | 30eb82f | 2011-09-21 11:16:02 +0100 | [diff] [blame^] | 69 | if (!rb) |
| 70 | return -EINVAL; |
| 71 | if (rb->access->mark_in_use) |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 72 | rb->access->mark_in_use(rb); |
Jonathan Cameron | 30eb82f | 2011-09-21 11:16:02 +0100 | [diff] [blame^] | 73 | return 0; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | void iio_chrdev_buffer_release(struct iio_dev *indio_dev) |
| 77 | { |
| 78 | struct iio_buffer *rb = indio_dev->buffer; |
| 79 | |
| 80 | clear_bit(IIO_BUSY_BIT_POS, &rb->flags); |
| 81 | if (rb->access->unmark_in_use) |
| 82 | rb->access->unmark_in_use(rb); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 83 | } |
| 84 | |
| 85 | void iio_buffer_init(struct iio_buffer *buffer, struct iio_dev *dev_info) |
| 86 | { |
| 87 | buffer->indio_dev = dev_info; |
| 88 | init_waitqueue_head(&buffer->pollq); |
| 89 | } |
| 90 | EXPORT_SYMBOL(iio_buffer_init); |
| 91 | |
| 92 | static ssize_t iio_show_scan_index(struct device *dev, |
| 93 | struct device_attribute *attr, |
| 94 | char *buf) |
| 95 | { |
| 96 | return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index); |
| 97 | } |
| 98 | |
| 99 | static ssize_t iio_show_fixed_type(struct device *dev, |
| 100 | struct device_attribute *attr, |
| 101 | char *buf) |
| 102 | { |
| 103 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| 104 | u8 type = this_attr->c->scan_type.endianness; |
| 105 | |
| 106 | if (type == IIO_CPU) { |
| 107 | if (__LITTLE_ENDIAN) |
| 108 | type = IIO_LE; |
| 109 | else |
| 110 | type = IIO_BE; |
| 111 | } |
| 112 | return sprintf(buf, "%s:%c%d/%d>>%u\n", |
| 113 | iio_endian_prefix[type], |
| 114 | this_attr->c->scan_type.sign, |
| 115 | this_attr->c->scan_type.realbits, |
| 116 | this_attr->c->scan_type.storagebits, |
| 117 | this_attr->c->scan_type.shift); |
| 118 | } |
| 119 | |
| 120 | static ssize_t iio_scan_el_show(struct device *dev, |
| 121 | struct device_attribute *attr, |
| 122 | char *buf) |
| 123 | { |
| 124 | int ret; |
| 125 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 126 | |
| 127 | ret = iio_scan_mask_query(dev_info->buffer, |
| 128 | to_iio_dev_attr(attr)->address); |
| 129 | if (ret < 0) |
| 130 | return ret; |
| 131 | return sprintf(buf, "%d\n", ret); |
| 132 | } |
| 133 | |
| 134 | static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit) |
| 135 | { |
| 136 | clear_bit(bit, buffer->scan_mask); |
| 137 | buffer->scan_count--; |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | static ssize_t iio_scan_el_store(struct device *dev, |
| 142 | struct device_attribute *attr, |
| 143 | const char *buf, |
| 144 | size_t len) |
| 145 | { |
| 146 | int ret = 0; |
| 147 | bool state; |
| 148 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| 149 | struct iio_buffer *buffer = indio_dev->buffer; |
| 150 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| 151 | |
| 152 | state = !(buf[0] == '0'); |
| 153 | mutex_lock(&indio_dev->mlock); |
| 154 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { |
| 155 | ret = -EBUSY; |
| 156 | goto error_ret; |
| 157 | } |
| 158 | ret = iio_scan_mask_query(buffer, this_attr->address); |
| 159 | if (ret < 0) |
| 160 | goto error_ret; |
| 161 | if (!state && ret) { |
| 162 | ret = iio_scan_mask_clear(buffer, this_attr->address); |
| 163 | if (ret) |
| 164 | goto error_ret; |
| 165 | } else if (state && !ret) { |
| 166 | ret = iio_scan_mask_set(buffer, this_attr->address); |
| 167 | if (ret) |
| 168 | goto error_ret; |
| 169 | } |
| 170 | |
| 171 | error_ret: |
| 172 | mutex_unlock(&indio_dev->mlock); |
| 173 | |
| 174 | return ret ? ret : len; |
| 175 | |
| 176 | } |
| 177 | |
| 178 | static ssize_t iio_scan_el_ts_show(struct device *dev, |
| 179 | struct device_attribute *attr, |
| 180 | char *buf) |
| 181 | { |
| 182 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 183 | return sprintf(buf, "%d\n", dev_info->buffer->scan_timestamp); |
| 184 | } |
| 185 | |
| 186 | static ssize_t iio_scan_el_ts_store(struct device *dev, |
| 187 | struct device_attribute *attr, |
| 188 | const char *buf, |
| 189 | size_t len) |
| 190 | { |
| 191 | int ret = 0; |
| 192 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| 193 | bool state; |
| 194 | |
| 195 | state = !(buf[0] == '0'); |
| 196 | mutex_lock(&indio_dev->mlock); |
| 197 | if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) { |
| 198 | ret = -EBUSY; |
| 199 | goto error_ret; |
| 200 | } |
| 201 | indio_dev->buffer->scan_timestamp = state; |
| 202 | error_ret: |
| 203 | mutex_unlock(&indio_dev->mlock); |
| 204 | |
| 205 | return ret ? ret : len; |
| 206 | } |
| 207 | |
| 208 | static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev, |
| 209 | const struct iio_chan_spec *chan) |
| 210 | { |
| 211 | int ret, attrcount = 0; |
| 212 | struct iio_buffer *buffer = indio_dev->buffer; |
| 213 | |
| 214 | ret = __iio_add_chan_devattr("index", |
| 215 | chan, |
| 216 | &iio_show_scan_index, |
| 217 | NULL, |
| 218 | 0, |
| 219 | 0, |
| 220 | &indio_dev->dev, |
| 221 | &buffer->scan_el_dev_attr_list); |
| 222 | if (ret) |
| 223 | goto error_ret; |
| 224 | attrcount++; |
| 225 | ret = __iio_add_chan_devattr("type", |
| 226 | chan, |
| 227 | &iio_show_fixed_type, |
| 228 | NULL, |
| 229 | 0, |
| 230 | 0, |
| 231 | &indio_dev->dev, |
| 232 | &buffer->scan_el_dev_attr_list); |
| 233 | if (ret) |
| 234 | goto error_ret; |
| 235 | attrcount++; |
| 236 | if (chan->type != IIO_TIMESTAMP) |
| 237 | ret = __iio_add_chan_devattr("en", |
| 238 | chan, |
| 239 | &iio_scan_el_show, |
| 240 | &iio_scan_el_store, |
| 241 | chan->scan_index, |
| 242 | 0, |
| 243 | &indio_dev->dev, |
| 244 | &buffer->scan_el_dev_attr_list); |
| 245 | else |
| 246 | ret = __iio_add_chan_devattr("en", |
| 247 | chan, |
| 248 | &iio_scan_el_ts_show, |
| 249 | &iio_scan_el_ts_store, |
| 250 | chan->scan_index, |
| 251 | 0, |
| 252 | &indio_dev->dev, |
| 253 | &buffer->scan_el_dev_attr_list); |
| 254 | attrcount++; |
| 255 | ret = attrcount; |
| 256 | error_ret: |
| 257 | return ret; |
| 258 | } |
| 259 | |
| 260 | static void iio_buffer_remove_and_free_scan_dev_attr(struct iio_dev *indio_dev, |
| 261 | struct iio_dev_attr *p) |
| 262 | { |
| 263 | kfree(p->dev_attr.attr.name); |
| 264 | kfree(p); |
| 265 | } |
| 266 | |
| 267 | static void __iio_buffer_attr_cleanup(struct iio_dev *indio_dev) |
| 268 | { |
| 269 | struct iio_dev_attr *p, *n; |
| 270 | struct iio_buffer *buffer = indio_dev->buffer; |
| 271 | |
| 272 | list_for_each_entry_safe(p, n, |
| 273 | &buffer->scan_el_dev_attr_list, l) |
| 274 | iio_buffer_remove_and_free_scan_dev_attr(indio_dev, p); |
| 275 | } |
| 276 | |
| 277 | static const char * const iio_scan_elements_group_name = "scan_elements"; |
| 278 | |
| 279 | int iio_buffer_register(struct iio_dev *indio_dev, |
| 280 | const struct iio_chan_spec *channels, |
| 281 | int num_channels) |
| 282 | { |
| 283 | struct iio_dev_attr *p; |
| 284 | struct attribute **attr; |
| 285 | struct iio_buffer *buffer = indio_dev->buffer; |
| 286 | int ret, i, attrn, attrcount, attrcount_orig = 0; |
| 287 | |
| 288 | if (buffer->attrs) |
| 289 | indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs; |
| 290 | |
| 291 | if (buffer->scan_el_attrs != NULL) { |
| 292 | attr = buffer->scan_el_attrs->attrs; |
| 293 | while (*attr++ != NULL) |
| 294 | attrcount_orig++; |
| 295 | } |
| 296 | attrcount = attrcount_orig; |
| 297 | INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list); |
| 298 | if (channels) { |
| 299 | /* new magic */ |
| 300 | for (i = 0; i < num_channels; i++) { |
| 301 | /* Establish necessary mask length */ |
| 302 | if (channels[i].scan_index > |
| 303 | (int)indio_dev->masklength - 1) |
| 304 | indio_dev->masklength |
| 305 | = indio_dev->channels[i].scan_index + 1; |
| 306 | |
| 307 | ret = iio_buffer_add_channel_sysfs(indio_dev, |
| 308 | &channels[i]); |
| 309 | if (ret < 0) |
| 310 | goto error_cleanup_dynamic; |
| 311 | attrcount += ret; |
| 312 | } |
| 313 | if (indio_dev->masklength && buffer->scan_mask == NULL) { |
| 314 | buffer->scan_mask |
| 315 | = kzalloc(sizeof(*buffer->scan_mask)* |
| 316 | BITS_TO_LONGS(indio_dev->masklength), |
| 317 | GFP_KERNEL); |
| 318 | if (buffer->scan_mask == NULL) { |
| 319 | ret = -ENOMEM; |
| 320 | goto error_cleanup_dynamic; |
| 321 | } |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | buffer->scan_el_group.name = iio_scan_elements_group_name; |
| 326 | |
| 327 | buffer->scan_el_group.attrs |
| 328 | = kzalloc(sizeof(buffer->scan_el_group.attrs[0])* |
| 329 | (attrcount + 1), |
| 330 | GFP_KERNEL); |
| 331 | if (buffer->scan_el_group.attrs == NULL) { |
| 332 | ret = -ENOMEM; |
| 333 | goto error_free_scan_mask; |
| 334 | } |
| 335 | if (buffer->scan_el_attrs) |
| 336 | memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs, |
| 337 | sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig); |
| 338 | attrn = attrcount_orig; |
| 339 | |
| 340 | list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l) |
| 341 | buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr; |
| 342 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group; |
| 343 | |
| 344 | return 0; |
| 345 | |
| 346 | error_free_scan_mask: |
| 347 | kfree(buffer->scan_mask); |
| 348 | error_cleanup_dynamic: |
| 349 | __iio_buffer_attr_cleanup(indio_dev); |
| 350 | |
| 351 | return ret; |
| 352 | } |
| 353 | EXPORT_SYMBOL(iio_buffer_register); |
| 354 | |
| 355 | void iio_buffer_unregister(struct iio_dev *indio_dev) |
| 356 | { |
| 357 | kfree(indio_dev->buffer->scan_mask); |
| 358 | kfree(indio_dev->buffer->scan_el_group.attrs); |
| 359 | __iio_buffer_attr_cleanup(indio_dev); |
| 360 | } |
| 361 | EXPORT_SYMBOL(iio_buffer_unregister); |
| 362 | |
| 363 | ssize_t iio_buffer_read_length(struct device *dev, |
| 364 | struct device_attribute *attr, |
| 365 | char *buf) |
| 366 | { |
| 367 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| 368 | struct iio_buffer *buffer = indio_dev->buffer; |
| 369 | |
| 370 | if (buffer->access->get_length) |
| 371 | return sprintf(buf, "%d\n", |
| 372 | buffer->access->get_length(buffer)); |
| 373 | |
| 374 | return 0; |
| 375 | } |
| 376 | EXPORT_SYMBOL(iio_buffer_read_length); |
| 377 | |
| 378 | ssize_t iio_buffer_write_length(struct device *dev, |
| 379 | struct device_attribute *attr, |
| 380 | const char *buf, |
| 381 | size_t len) |
| 382 | { |
| 383 | int ret; |
| 384 | ulong val; |
| 385 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| 386 | struct iio_buffer *buffer = indio_dev->buffer; |
| 387 | |
| 388 | ret = strict_strtoul(buf, 10, &val); |
| 389 | if (ret) |
| 390 | return ret; |
| 391 | |
| 392 | if (buffer->access->get_length) |
| 393 | if (val == buffer->access->get_length(buffer)) |
| 394 | return len; |
| 395 | |
| 396 | if (buffer->access->set_length) { |
| 397 | buffer->access->set_length(buffer, val); |
| 398 | if (buffer->access->mark_param_change) |
| 399 | buffer->access->mark_param_change(buffer); |
| 400 | } |
| 401 | |
| 402 | return len; |
| 403 | } |
| 404 | EXPORT_SYMBOL(iio_buffer_write_length); |
| 405 | |
| 406 | ssize_t iio_buffer_read_bytes_per_datum(struct device *dev, |
| 407 | struct device_attribute *attr, |
| 408 | char *buf) |
| 409 | { |
| 410 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| 411 | struct iio_buffer *buffer = indio_dev->buffer; |
| 412 | |
| 413 | if (buffer->access->get_bytes_per_datum) |
| 414 | return sprintf(buf, "%d\n", |
| 415 | buffer->access->get_bytes_per_datum(buffer)); |
| 416 | |
| 417 | return 0; |
| 418 | } |
| 419 | EXPORT_SYMBOL(iio_buffer_read_bytes_per_datum); |
| 420 | |
| 421 | ssize_t iio_buffer_store_enable(struct device *dev, |
| 422 | struct device_attribute *attr, |
| 423 | const char *buf, |
| 424 | size_t len) |
| 425 | { |
| 426 | int ret; |
| 427 | bool requested_state, current_state; |
| 428 | int previous_mode; |
| 429 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 430 | struct iio_buffer *buffer = dev_info->buffer; |
| 431 | |
| 432 | mutex_lock(&dev_info->mlock); |
| 433 | previous_mode = dev_info->currentmode; |
| 434 | requested_state = !(buf[0] == '0'); |
| 435 | current_state = !!(previous_mode & INDIO_ALL_BUFFER_MODES); |
| 436 | if (current_state == requested_state) { |
| 437 | printk(KERN_INFO "iio-buffer, current state requested again\n"); |
| 438 | goto done; |
| 439 | } |
| 440 | if (requested_state) { |
| 441 | if (buffer->setup_ops->preenable) { |
| 442 | ret = buffer->setup_ops->preenable(dev_info); |
| 443 | if (ret) { |
| 444 | printk(KERN_ERR |
| 445 | "Buffer not started:" |
| 446 | "buffer preenable failed\n"); |
| 447 | goto error_ret; |
| 448 | } |
| 449 | } |
| 450 | if (buffer->access->request_update) { |
| 451 | ret = buffer->access->request_update(buffer); |
| 452 | if (ret) { |
| 453 | printk(KERN_INFO |
| 454 | "Buffer not started:" |
| 455 | "buffer parameter update failed\n"); |
| 456 | goto error_ret; |
| 457 | } |
| 458 | } |
| 459 | if (buffer->access->mark_in_use) |
| 460 | buffer->access->mark_in_use(buffer); |
| 461 | /* Definitely possible for devices to support both of these.*/ |
| 462 | if (dev_info->modes & INDIO_BUFFER_TRIGGERED) { |
| 463 | if (!dev_info->trig) { |
| 464 | printk(KERN_INFO |
| 465 | "Buffer not started: no trigger\n"); |
| 466 | ret = -EINVAL; |
| 467 | if (buffer->access->unmark_in_use) |
| 468 | buffer->access->unmark_in_use(buffer); |
| 469 | goto error_ret; |
| 470 | } |
| 471 | dev_info->currentmode = INDIO_BUFFER_TRIGGERED; |
| 472 | } else if (dev_info->modes & INDIO_BUFFER_HARDWARE) |
| 473 | dev_info->currentmode = INDIO_BUFFER_HARDWARE; |
| 474 | else { /* should never be reached */ |
| 475 | ret = -EINVAL; |
| 476 | goto error_ret; |
| 477 | } |
| 478 | |
| 479 | if (buffer->setup_ops->postenable) { |
| 480 | ret = buffer->setup_ops->postenable(dev_info); |
| 481 | if (ret) { |
| 482 | printk(KERN_INFO |
| 483 | "Buffer not started:" |
| 484 | "postenable failed\n"); |
| 485 | if (buffer->access->unmark_in_use) |
| 486 | buffer->access->unmark_in_use(buffer); |
| 487 | dev_info->currentmode = previous_mode; |
| 488 | if (buffer->setup_ops->postdisable) |
| 489 | buffer->setup_ops-> |
| 490 | postdisable(dev_info); |
| 491 | goto error_ret; |
| 492 | } |
| 493 | } |
| 494 | } else { |
| 495 | if (buffer->setup_ops->predisable) { |
| 496 | ret = buffer->setup_ops->predisable(dev_info); |
| 497 | if (ret) |
| 498 | goto error_ret; |
| 499 | } |
| 500 | if (buffer->access->unmark_in_use) |
| 501 | buffer->access->unmark_in_use(buffer); |
| 502 | dev_info->currentmode = INDIO_DIRECT_MODE; |
| 503 | if (buffer->setup_ops->postdisable) { |
| 504 | ret = buffer->setup_ops->postdisable(dev_info); |
| 505 | if (ret) |
| 506 | goto error_ret; |
| 507 | } |
| 508 | } |
| 509 | done: |
| 510 | mutex_unlock(&dev_info->mlock); |
| 511 | return len; |
| 512 | |
| 513 | error_ret: |
| 514 | mutex_unlock(&dev_info->mlock); |
| 515 | return ret; |
| 516 | } |
| 517 | EXPORT_SYMBOL(iio_buffer_store_enable); |
| 518 | |
| 519 | ssize_t iio_buffer_show_enable(struct device *dev, |
| 520 | struct device_attribute *attr, |
| 521 | char *buf) |
| 522 | { |
| 523 | struct iio_dev *dev_info = dev_get_drvdata(dev); |
| 524 | return sprintf(buf, "%d\n", !!(dev_info->currentmode |
| 525 | & INDIO_ALL_BUFFER_MODES)); |
| 526 | } |
| 527 | EXPORT_SYMBOL(iio_buffer_show_enable); |
| 528 | |
| 529 | int iio_sw_buffer_preenable(struct iio_dev *indio_dev) |
| 530 | { |
| 531 | struct iio_buffer *buffer = indio_dev->buffer; |
| 532 | size_t size; |
| 533 | dev_dbg(&indio_dev->dev, "%s\n", __func__); |
| 534 | /* Check if there are any scan elements enabled, if not fail*/ |
| 535 | if (!(buffer->scan_count || buffer->scan_timestamp)) |
| 536 | return -EINVAL; |
| 537 | if (buffer->scan_timestamp) |
| 538 | if (buffer->scan_count) |
| 539 | /* Timestamp (aligned to s64) and data */ |
| 540 | size = (((buffer->scan_count * buffer->bpe) |
| 541 | + sizeof(s64) - 1) |
| 542 | & ~(sizeof(s64) - 1)) |
| 543 | + sizeof(s64); |
| 544 | else /* Timestamp only */ |
| 545 | size = sizeof(s64); |
| 546 | else /* Data only */ |
| 547 | size = buffer->scan_count * buffer->bpe; |
| 548 | buffer->access->set_bytes_per_datum(buffer, size); |
| 549 | |
| 550 | return 0; |
| 551 | } |
| 552 | EXPORT_SYMBOL(iio_sw_buffer_preenable); |
| 553 | |
| 554 | |
| 555 | /* note NULL used as error indicator as it doesn't make sense. */ |
| 556 | static unsigned long *iio_scan_mask_match(unsigned long *av_masks, |
| 557 | unsigned int masklength, |
| 558 | unsigned long *mask) |
| 559 | { |
| 560 | if (bitmap_empty(mask, masklength)) |
| 561 | return NULL; |
| 562 | while (*av_masks) { |
| 563 | if (bitmap_subset(mask, av_masks, masklength)) |
| 564 | return av_masks; |
| 565 | av_masks += BITS_TO_LONGS(masklength); |
| 566 | } |
| 567 | return NULL; |
| 568 | } |
| 569 | |
| 570 | /** |
| 571 | * iio_scan_mask_set() - set particular bit in the scan mask |
| 572 | * @buffer: the buffer whose scan mask we are interested in |
| 573 | * @bit: the bit to be set. |
| 574 | **/ |
| 575 | int iio_scan_mask_set(struct iio_buffer *buffer, int bit) |
| 576 | { |
| 577 | struct iio_dev *dev_info = buffer->indio_dev; |
| 578 | unsigned long *mask; |
| 579 | unsigned long *trialmask; |
| 580 | |
| 581 | trialmask = kmalloc(sizeof(*trialmask)* |
| 582 | BITS_TO_LONGS(dev_info->masklength), |
| 583 | GFP_KERNEL); |
| 584 | |
| 585 | if (trialmask == NULL) |
| 586 | return -ENOMEM; |
| 587 | if (!dev_info->masklength) { |
| 588 | WARN_ON("trying to set scanmask prior to registering buffer\n"); |
| 589 | kfree(trialmask); |
| 590 | return -EINVAL; |
| 591 | } |
| 592 | bitmap_copy(trialmask, buffer->scan_mask, dev_info->masklength); |
| 593 | set_bit(bit, trialmask); |
| 594 | |
| 595 | if (dev_info->available_scan_masks) { |
| 596 | mask = iio_scan_mask_match(dev_info->available_scan_masks, |
| 597 | dev_info->masklength, |
| 598 | trialmask); |
| 599 | if (!mask) { |
| 600 | kfree(trialmask); |
| 601 | return -EINVAL; |
| 602 | } |
| 603 | } |
| 604 | bitmap_copy(buffer->scan_mask, trialmask, dev_info->masklength); |
| 605 | buffer->scan_count++; |
| 606 | |
| 607 | kfree(trialmask); |
| 608 | |
| 609 | return 0; |
| 610 | }; |
| 611 | EXPORT_SYMBOL_GPL(iio_scan_mask_set); |
| 612 | |
| 613 | int iio_scan_mask_query(struct iio_buffer *buffer, int bit) |
| 614 | { |
| 615 | struct iio_dev *dev_info = buffer->indio_dev; |
| 616 | long *mask; |
| 617 | |
| 618 | if (bit > dev_info->masklength) |
| 619 | return -EINVAL; |
| 620 | |
| 621 | if (!buffer->scan_mask) |
| 622 | return 0; |
| 623 | if (dev_info->available_scan_masks) |
| 624 | mask = iio_scan_mask_match(dev_info->available_scan_masks, |
| 625 | dev_info->masklength, |
| 626 | buffer->scan_mask); |
| 627 | else |
| 628 | mask = buffer->scan_mask; |
| 629 | if (!mask) |
| 630 | return 0; |
| 631 | |
| 632 | return test_bit(bit, mask); |
| 633 | }; |
| 634 | EXPORT_SYMBOL_GPL(iio_scan_mask_query); |