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> |
Paul Gortmaker | 8e336a7 | 2011-07-10 13:09:12 -0400 | [diff] [blame] | 17 | #include <linux/export.h> |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 18 | #include <linux/device.h> |
| 19 | #include <linux/fs.h> |
| 20 | #include <linux/cdev.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/poll.h> |
Lars-Peter Clausen | d2f0a48 | 2013-10-04 12:07:00 +0100 | [diff] [blame] | 23 | #include <linux/sched.h> |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 24 | |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 25 | #include <linux/iio/iio.h> |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 26 | #include "iio_core.h" |
Jonathan Cameron | 06458e2 | 2012-04-25 15:54:58 +0100 | [diff] [blame] | 27 | #include <linux/iio/sysfs.h> |
| 28 | #include <linux/iio/buffer.h> |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 29 | |
| 30 | static const char * const iio_endian_prefix[] = { |
| 31 | [IIO_BE] = "be", |
| 32 | [IIO_LE] = "le", |
| 33 | }; |
| 34 | |
Lars-Peter Clausen | 705ee2c | 2013-09-15 16:31:00 +0100 | [diff] [blame] | 35 | static bool iio_buffer_is_active(struct iio_buffer *buf) |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 36 | { |
Lars-Peter Clausen | 705ee2c | 2013-09-15 16:31:00 +0100 | [diff] [blame] | 37 | return !list_empty(&buf->buffer_list); |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 38 | } |
| 39 | |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 40 | static size_t iio_buffer_data_available(struct iio_buffer *buf) |
Lars-Peter Clausen | 647cc7b | 2013-11-25 14:56:00 +0000 | [diff] [blame] | 41 | { |
Josselin Costanzi | 9dd4694 | 2014-06-27 17:20:00 +0100 | [diff] [blame] | 42 | return buf->access->data_available(buf); |
Lars-Peter Clausen | 647cc7b | 2013-11-25 14:56:00 +0000 | [diff] [blame] | 43 | } |
| 44 | |
Octavian Purdila | f4f4673 | 2015-03-22 20:33:39 +0200 | [diff] [blame] | 45 | static int iio_buffer_flush_hwfifo(struct iio_dev *indio_dev, |
| 46 | struct iio_buffer *buf, size_t required) |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 47 | { |
Octavian Purdila | f4f4673 | 2015-03-22 20:33:39 +0200 | [diff] [blame] | 48 | if (!indio_dev->info->hwfifo_flush_to_buffer) |
| 49 | return -ENODEV; |
| 50 | |
| 51 | return indio_dev->info->hwfifo_flush_to_buffer(indio_dev, required); |
| 52 | } |
| 53 | |
| 54 | static bool iio_buffer_ready(struct iio_dev *indio_dev, struct iio_buffer *buf, |
| 55 | size_t to_wait, int to_flush) |
| 56 | { |
| 57 | size_t avail; |
| 58 | int flushed = 0; |
| 59 | |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 60 | /* wakeup if the device was unregistered */ |
| 61 | if (!indio_dev->info) |
| 62 | return true; |
| 63 | |
| 64 | /* drain the buffer if it was disabled */ |
Octavian Purdila | f4f4673 | 2015-03-22 20:33:39 +0200 | [diff] [blame] | 65 | if (!iio_buffer_is_active(buf)) { |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 66 | to_wait = min_t(size_t, to_wait, 1); |
Octavian Purdila | f4f4673 | 2015-03-22 20:33:39 +0200 | [diff] [blame] | 67 | to_flush = 0; |
| 68 | } |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 69 | |
Octavian Purdila | f4f4673 | 2015-03-22 20:33:39 +0200 | [diff] [blame] | 70 | avail = iio_buffer_data_available(buf); |
| 71 | |
| 72 | if (avail >= to_wait) { |
| 73 | /* force a flush for non-blocking reads */ |
Octavian Purdila | c6f67a1 | 2015-06-05 15:56:47 +0300 | [diff] [blame] | 74 | if (!to_wait && avail < to_flush) |
| 75 | iio_buffer_flush_hwfifo(indio_dev, buf, |
| 76 | to_flush - avail); |
Octavian Purdila | f4f4673 | 2015-03-22 20:33:39 +0200 | [diff] [blame] | 77 | return true; |
| 78 | } |
| 79 | |
| 80 | if (to_flush) |
| 81 | flushed = iio_buffer_flush_hwfifo(indio_dev, buf, |
| 82 | to_wait - avail); |
| 83 | if (flushed <= 0) |
| 84 | return false; |
| 85 | |
| 86 | if (avail + flushed >= to_wait) |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 87 | return true; |
| 88 | |
| 89 | return false; |
| 90 | } |
| 91 | |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 92 | /** |
| 93 | * iio_buffer_read_first_n_outer() - chrdev read for buffer access |
Cristina Opriceana | 0123635 | 2015-07-24 16:18:09 +0300 | [diff] [blame] | 94 | * @filp: File structure pointer for the char device |
| 95 | * @buf: Destination buffer for iio buffer read |
| 96 | * @n: First n bytes to read |
| 97 | * @f_ps: Long offset provided by the user as a seek position |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 98 | * |
| 99 | * This function relies on all buffer implementations having an |
| 100 | * iio_buffer as their first element. |
Cristina Opriceana | 0123635 | 2015-07-24 16:18:09 +0300 | [diff] [blame] | 101 | * |
| 102 | * Return: negative values corresponding to error codes or ret != 0 |
| 103 | * for ending the reading activity |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 104 | **/ |
| 105 | ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf, |
| 106 | size_t n, loff_t *f_ps) |
| 107 | { |
| 108 | struct iio_dev *indio_dev = filp->private_data; |
| 109 | struct iio_buffer *rb = indio_dev->buffer; |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 110 | size_t datum_size; |
Octavian Purdila | c6f67a1 | 2015-06-05 15:56:47 +0300 | [diff] [blame] | 111 | size_t to_wait; |
Lars-Peter Clausen | ee551a1 | 2013-11-25 14:56:00 +0000 | [diff] [blame] | 112 | int ret; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 113 | |
Lars-Peter Clausen | f18e7a0 | 2013-10-04 12:06:00 +0100 | [diff] [blame] | 114 | if (!indio_dev->info) |
| 115 | return -ENODEV; |
| 116 | |
Jonathan Cameron | 96e00f1 | 2011-10-26 17:27:45 +0100 | [diff] [blame] | 117 | if (!rb || !rb->access->read_first_n) |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 118 | return -EINVAL; |
Lars-Peter Clausen | ee551a1 | 2013-11-25 14:56:00 +0000 | [diff] [blame] | 119 | |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 120 | datum_size = rb->bytes_per_datum; |
Lars-Peter Clausen | ee551a1 | 2013-11-25 14:56:00 +0000 | [diff] [blame] | 121 | |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 122 | /* |
| 123 | * If datum_size is 0 there will never be anything to read from the |
| 124 | * buffer, so signal end of file now. |
| 125 | */ |
| 126 | if (!datum_size) |
| 127 | return 0; |
| 128 | |
Octavian Purdila | c6f67a1 | 2015-06-05 15:56:47 +0300 | [diff] [blame] | 129 | if (filp->f_flags & O_NONBLOCK) |
| 130 | to_wait = 0; |
| 131 | else |
| 132 | to_wait = min_t(size_t, n / datum_size, rb->watermark); |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 133 | |
| 134 | do { |
| 135 | ret = wait_event_interruptible(rb->pollq, |
Octavian Purdila | c6f67a1 | 2015-06-05 15:56:47 +0300 | [diff] [blame] | 136 | iio_buffer_ready(indio_dev, rb, to_wait, n / datum_size)); |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 137 | if (ret) |
| 138 | return ret; |
| 139 | |
| 140 | if (!indio_dev->info) |
| 141 | return -ENODEV; |
Lars-Peter Clausen | ee551a1 | 2013-11-25 14:56:00 +0000 | [diff] [blame] | 142 | |
| 143 | ret = rb->access->read_first_n(rb, n, buf); |
| 144 | if (ret == 0 && (filp->f_flags & O_NONBLOCK)) |
| 145 | ret = -EAGAIN; |
| 146 | } while (ret == 0); |
| 147 | |
| 148 | return ret; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 149 | } |
| 150 | |
| 151 | /** |
| 152 | * iio_buffer_poll() - poll the buffer to find out if it has data |
Cristina Opriceana | 0123635 | 2015-07-24 16:18:09 +0300 | [diff] [blame] | 153 | * @filp: File structure pointer for device access |
| 154 | * @wait: Poll table structure pointer for which the driver adds |
| 155 | * a wait queue |
| 156 | * |
| 157 | * Return: (POLLIN | POLLRDNORM) if data is available for reading |
| 158 | * or 0 for other cases |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 159 | */ |
| 160 | unsigned int iio_buffer_poll(struct file *filp, |
| 161 | struct poll_table_struct *wait) |
| 162 | { |
| 163 | struct iio_dev *indio_dev = filp->private_data; |
| 164 | struct iio_buffer *rb = indio_dev->buffer; |
| 165 | |
Lars-Peter Clausen | f18e7a0 | 2013-10-04 12:06:00 +0100 | [diff] [blame] | 166 | if (!indio_dev->info) |
Cristina Opriceana | 1bdc029 | 2015-08-03 13:37:40 +0300 | [diff] [blame] | 167 | return 0; |
Lars-Peter Clausen | f18e7a0 | 2013-10-04 12:06:00 +0100 | [diff] [blame] | 168 | |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 169 | poll_wait(filp, &rb->pollq, wait); |
Octavian Purdila | f4f4673 | 2015-03-22 20:33:39 +0200 | [diff] [blame] | 170 | if (iio_buffer_ready(indio_dev, rb, rb->watermark, 0)) |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 171 | return POLLIN | POLLRDNORM; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 172 | return 0; |
| 173 | } |
| 174 | |
Lars-Peter Clausen | d2f0a48 | 2013-10-04 12:07:00 +0100 | [diff] [blame] | 175 | /** |
| 176 | * iio_buffer_wakeup_poll - Wakes up the buffer waitqueue |
| 177 | * @indio_dev: The IIO device |
| 178 | * |
| 179 | * Wakes up the event waitqueue used for poll(). Should usually |
| 180 | * be called when the device is unregistered. |
| 181 | */ |
| 182 | void iio_buffer_wakeup_poll(struct iio_dev *indio_dev) |
| 183 | { |
| 184 | if (!indio_dev->buffer) |
| 185 | return; |
| 186 | |
| 187 | wake_up(&indio_dev->buffer->pollq); |
| 188 | } |
| 189 | |
Jonathan Cameron | f79a909 | 2011-12-05 22:18:29 +0000 | [diff] [blame] | 190 | void iio_buffer_init(struct iio_buffer *buffer) |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 191 | { |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 192 | INIT_LIST_HEAD(&buffer->demux_list); |
Lars-Peter Clausen | 705ee2c | 2013-09-15 16:31:00 +0100 | [diff] [blame] | 193 | INIT_LIST_HEAD(&buffer->buffer_list); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 194 | init_waitqueue_head(&buffer->pollq); |
Lars-Peter Clausen | 9e69c93 | 2013-10-04 12:06:00 +0100 | [diff] [blame] | 195 | kref_init(&buffer->ref); |
Lars-Peter Clausen | 4a60535 | 2015-10-13 18:10:25 +0200 | [diff] [blame] | 196 | if (!buffer->watermark) |
| 197 | buffer->watermark = 1; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 198 | } |
| 199 | EXPORT_SYMBOL(iio_buffer_init); |
| 200 | |
| 201 | static ssize_t iio_show_scan_index(struct device *dev, |
| 202 | struct device_attribute *attr, |
| 203 | char *buf) |
| 204 | { |
| 205 | return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index); |
| 206 | } |
| 207 | |
| 208 | static ssize_t iio_show_fixed_type(struct device *dev, |
| 209 | struct device_attribute *attr, |
| 210 | char *buf) |
| 211 | { |
| 212 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| 213 | u8 type = this_attr->c->scan_type.endianness; |
| 214 | |
| 215 | if (type == IIO_CPU) { |
Jonathan Cameron | 9d5d115 | 2011-10-04 16:02:08 +0100 | [diff] [blame] | 216 | #ifdef __LITTLE_ENDIAN |
| 217 | type = IIO_LE; |
| 218 | #else |
| 219 | type = IIO_BE; |
| 220 | #endif |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 221 | } |
Srinivas Pandruvada | 0ee8546 | 2014-04-29 00:51:00 +0100 | [diff] [blame] | 222 | if (this_attr->c->scan_type.repeat > 1) |
| 223 | return sprintf(buf, "%s:%c%d/%dX%d>>%u\n", |
| 224 | iio_endian_prefix[type], |
| 225 | this_attr->c->scan_type.sign, |
| 226 | this_attr->c->scan_type.realbits, |
| 227 | this_attr->c->scan_type.storagebits, |
| 228 | this_attr->c->scan_type.repeat, |
| 229 | this_attr->c->scan_type.shift); |
| 230 | else |
| 231 | return sprintf(buf, "%s:%c%d/%d>>%u\n", |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 232 | iio_endian_prefix[type], |
| 233 | this_attr->c->scan_type.sign, |
| 234 | this_attr->c->scan_type.realbits, |
| 235 | this_attr->c->scan_type.storagebits, |
| 236 | this_attr->c->scan_type.shift); |
| 237 | } |
| 238 | |
| 239 | static ssize_t iio_scan_el_show(struct device *dev, |
| 240 | struct device_attribute *attr, |
| 241 | char *buf) |
| 242 | { |
| 243 | int ret; |
Lars-Peter Clausen | e53f5ac | 2012-05-12 15:39:33 +0200 | [diff] [blame] | 244 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 245 | |
Alec Berg | 2076a20 | 2014-03-19 18:50:00 +0000 | [diff] [blame] | 246 | /* Ensure ret is 0 or 1. */ |
| 247 | ret = !!test_bit(to_iio_dev_attr(attr)->address, |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 248 | indio_dev->buffer->scan_mask); |
| 249 | |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 250 | return sprintf(buf, "%d\n", ret); |
| 251 | } |
| 252 | |
Lars-Peter Clausen | 217a5cf | 2014-11-26 18:55:09 +0100 | [diff] [blame] | 253 | /* Note NULL used as error indicator as it doesn't make sense. */ |
| 254 | static const unsigned long *iio_scan_mask_match(const unsigned long *av_masks, |
| 255 | unsigned int masklength, |
Lars-Peter Clausen | 1e1ec28 | 2015-05-29 18:14:22 +0200 | [diff] [blame] | 256 | const unsigned long *mask, |
| 257 | bool strict) |
Lars-Peter Clausen | 217a5cf | 2014-11-26 18:55:09 +0100 | [diff] [blame] | 258 | { |
| 259 | if (bitmap_empty(mask, masklength)) |
| 260 | return NULL; |
| 261 | while (*av_masks) { |
Lars-Peter Clausen | 1e1ec28 | 2015-05-29 18:14:22 +0200 | [diff] [blame] | 262 | if (strict) { |
| 263 | if (bitmap_equal(mask, av_masks, masklength)) |
| 264 | return av_masks; |
| 265 | } else { |
| 266 | if (bitmap_subset(mask, av_masks, masklength)) |
| 267 | return av_masks; |
| 268 | } |
Lars-Peter Clausen | 217a5cf | 2014-11-26 18:55:09 +0100 | [diff] [blame] | 269 | av_masks += BITS_TO_LONGS(masklength); |
| 270 | } |
| 271 | return NULL; |
| 272 | } |
| 273 | |
| 274 | static bool iio_validate_scan_mask(struct iio_dev *indio_dev, |
| 275 | const unsigned long *mask) |
| 276 | { |
| 277 | if (!indio_dev->setup_ops->validate_scan_mask) |
| 278 | return true; |
| 279 | |
| 280 | return indio_dev->setup_ops->validate_scan_mask(indio_dev, mask); |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * iio_scan_mask_set() - set particular bit in the scan mask |
| 285 | * @indio_dev: the iio device |
| 286 | * @buffer: the buffer whose scan mask we are interested in |
| 287 | * @bit: the bit to be set. |
| 288 | * |
| 289 | * Note that at this point we have no way of knowing what other |
| 290 | * buffers might request, hence this code only verifies that the |
| 291 | * individual buffers request is plausible. |
| 292 | */ |
| 293 | static int iio_scan_mask_set(struct iio_dev *indio_dev, |
| 294 | struct iio_buffer *buffer, int bit) |
| 295 | { |
| 296 | const unsigned long *mask; |
| 297 | unsigned long *trialmask; |
| 298 | |
| 299 | trialmask = kmalloc(sizeof(*trialmask)* |
| 300 | BITS_TO_LONGS(indio_dev->masklength), |
| 301 | GFP_KERNEL); |
| 302 | |
| 303 | if (trialmask == NULL) |
| 304 | return -ENOMEM; |
| 305 | if (!indio_dev->masklength) { |
| 306 | WARN_ON("Trying to set scanmask prior to registering buffer\n"); |
| 307 | goto err_invalid_mask; |
| 308 | } |
| 309 | bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength); |
| 310 | set_bit(bit, trialmask); |
| 311 | |
| 312 | if (!iio_validate_scan_mask(indio_dev, trialmask)) |
| 313 | goto err_invalid_mask; |
| 314 | |
| 315 | if (indio_dev->available_scan_masks) { |
| 316 | mask = iio_scan_mask_match(indio_dev->available_scan_masks, |
| 317 | indio_dev->masklength, |
Lars-Peter Clausen | 1e1ec28 | 2015-05-29 18:14:22 +0200 | [diff] [blame] | 318 | trialmask, false); |
Lars-Peter Clausen | 217a5cf | 2014-11-26 18:55:09 +0100 | [diff] [blame] | 319 | if (!mask) |
| 320 | goto err_invalid_mask; |
| 321 | } |
| 322 | bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength); |
| 323 | |
| 324 | kfree(trialmask); |
| 325 | |
| 326 | return 0; |
| 327 | |
| 328 | err_invalid_mask: |
| 329 | kfree(trialmask); |
| 330 | return -EINVAL; |
| 331 | } |
| 332 | |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 333 | static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit) |
| 334 | { |
| 335 | clear_bit(bit, buffer->scan_mask); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 336 | return 0; |
| 337 | } |
| 338 | |
| 339 | static ssize_t iio_scan_el_store(struct device *dev, |
| 340 | struct device_attribute *attr, |
| 341 | const char *buf, |
| 342 | size_t len) |
| 343 | { |
Jonathan Cameron | a714af2 | 2012-04-21 10:09:32 +0100 | [diff] [blame] | 344 | int ret; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 345 | bool state; |
Lars-Peter Clausen | e53f5ac | 2012-05-12 15:39:33 +0200 | [diff] [blame] | 346 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 347 | struct iio_buffer *buffer = indio_dev->buffer; |
| 348 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| 349 | |
Jonathan Cameron | a714af2 | 2012-04-21 10:09:32 +0100 | [diff] [blame] | 350 | ret = strtobool(buf, &state); |
| 351 | if (ret < 0) |
| 352 | return ret; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 353 | mutex_lock(&indio_dev->mlock); |
Lars-Peter Clausen | 705ee2c | 2013-09-15 16:31:00 +0100 | [diff] [blame] | 354 | if (iio_buffer_is_active(indio_dev->buffer)) { |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 355 | ret = -EBUSY; |
| 356 | goto error_ret; |
| 357 | } |
Jonathan Cameron | f79a909 | 2011-12-05 22:18:29 +0000 | [diff] [blame] | 358 | ret = iio_scan_mask_query(indio_dev, buffer, this_attr->address); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 359 | if (ret < 0) |
| 360 | goto error_ret; |
| 361 | if (!state && ret) { |
| 362 | ret = iio_scan_mask_clear(buffer, this_attr->address); |
| 363 | if (ret) |
| 364 | goto error_ret; |
| 365 | } else if (state && !ret) { |
Jonathan Cameron | f79a909 | 2011-12-05 22:18:29 +0000 | [diff] [blame] | 366 | ret = iio_scan_mask_set(indio_dev, buffer, this_attr->address); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 367 | if (ret) |
| 368 | goto error_ret; |
| 369 | } |
| 370 | |
| 371 | error_ret: |
| 372 | mutex_unlock(&indio_dev->mlock); |
| 373 | |
Lars-Peter Clausen | 5a2a6e1 | 2011-12-08 18:35:53 +0100 | [diff] [blame] | 374 | return ret < 0 ? ret : len; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 375 | |
| 376 | } |
| 377 | |
| 378 | static ssize_t iio_scan_el_ts_show(struct device *dev, |
| 379 | struct device_attribute *attr, |
| 380 | char *buf) |
| 381 | { |
Lars-Peter Clausen | e53f5ac | 2012-05-12 15:39:33 +0200 | [diff] [blame] | 382 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 383 | return sprintf(buf, "%d\n", indio_dev->buffer->scan_timestamp); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 384 | } |
| 385 | |
| 386 | static ssize_t iio_scan_el_ts_store(struct device *dev, |
| 387 | struct device_attribute *attr, |
| 388 | const char *buf, |
| 389 | size_t len) |
| 390 | { |
Jonathan Cameron | a714af2 | 2012-04-21 10:09:32 +0100 | [diff] [blame] | 391 | int ret; |
Lars-Peter Clausen | e53f5ac | 2012-05-12 15:39:33 +0200 | [diff] [blame] | 392 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 393 | bool state; |
| 394 | |
Jonathan Cameron | a714af2 | 2012-04-21 10:09:32 +0100 | [diff] [blame] | 395 | ret = strtobool(buf, &state); |
| 396 | if (ret < 0) |
| 397 | return ret; |
| 398 | |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 399 | mutex_lock(&indio_dev->mlock); |
Lars-Peter Clausen | 705ee2c | 2013-09-15 16:31:00 +0100 | [diff] [blame] | 400 | if (iio_buffer_is_active(indio_dev->buffer)) { |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 401 | ret = -EBUSY; |
| 402 | goto error_ret; |
| 403 | } |
| 404 | indio_dev->buffer->scan_timestamp = state; |
| 405 | error_ret: |
| 406 | mutex_unlock(&indio_dev->mlock); |
| 407 | |
| 408 | return ret ? ret : len; |
| 409 | } |
| 410 | |
| 411 | static int iio_buffer_add_channel_sysfs(struct iio_dev *indio_dev, |
| 412 | const struct iio_chan_spec *chan) |
| 413 | { |
| 414 | int ret, attrcount = 0; |
| 415 | struct iio_buffer *buffer = indio_dev->buffer; |
| 416 | |
| 417 | ret = __iio_add_chan_devattr("index", |
| 418 | chan, |
| 419 | &iio_show_scan_index, |
| 420 | NULL, |
| 421 | 0, |
Jonathan Cameron | 3704432 | 2013-09-08 14:57:00 +0100 | [diff] [blame] | 422 | IIO_SEPARATE, |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 423 | &indio_dev->dev, |
| 424 | &buffer->scan_el_dev_attr_list); |
| 425 | if (ret) |
Hartmut Knaack | 92825ff | 2014-02-16 11:53:00 +0000 | [diff] [blame] | 426 | return ret; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 427 | attrcount++; |
| 428 | ret = __iio_add_chan_devattr("type", |
| 429 | chan, |
| 430 | &iio_show_fixed_type, |
| 431 | NULL, |
| 432 | 0, |
| 433 | 0, |
| 434 | &indio_dev->dev, |
| 435 | &buffer->scan_el_dev_attr_list); |
| 436 | if (ret) |
Hartmut Knaack | 92825ff | 2014-02-16 11:53:00 +0000 | [diff] [blame] | 437 | return ret; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 438 | attrcount++; |
| 439 | if (chan->type != IIO_TIMESTAMP) |
| 440 | ret = __iio_add_chan_devattr("en", |
| 441 | chan, |
| 442 | &iio_scan_el_show, |
| 443 | &iio_scan_el_store, |
| 444 | chan->scan_index, |
| 445 | 0, |
| 446 | &indio_dev->dev, |
| 447 | &buffer->scan_el_dev_attr_list); |
| 448 | else |
| 449 | ret = __iio_add_chan_devattr("en", |
| 450 | chan, |
| 451 | &iio_scan_el_ts_show, |
| 452 | &iio_scan_el_ts_store, |
| 453 | chan->scan_index, |
| 454 | 0, |
| 455 | &indio_dev->dev, |
| 456 | &buffer->scan_el_dev_attr_list); |
Peter Meerwald | 9572588 | 2013-09-17 23:42:00 +0100 | [diff] [blame] | 457 | if (ret) |
Hartmut Knaack | 92825ff | 2014-02-16 11:53:00 +0000 | [diff] [blame] | 458 | return ret; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 459 | attrcount++; |
| 460 | ret = attrcount; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 461 | return ret; |
| 462 | } |
| 463 | |
Lars-Peter Clausen | 08e7e0a | 2014-11-26 18:55:15 +0100 | [diff] [blame] | 464 | static ssize_t iio_buffer_read_length(struct device *dev, |
| 465 | struct device_attribute *attr, |
| 466 | char *buf) |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 467 | { |
Lars-Peter Clausen | e53f5ac | 2012-05-12 15:39:33 +0200 | [diff] [blame] | 468 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 469 | struct iio_buffer *buffer = indio_dev->buffer; |
| 470 | |
Lars-Peter Clausen | 3749566 | 2014-11-26 18:55:17 +0100 | [diff] [blame] | 471 | return sprintf(buf, "%d\n", buffer->length); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 472 | } |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 473 | |
Lars-Peter Clausen | 08e7e0a | 2014-11-26 18:55:15 +0100 | [diff] [blame] | 474 | static ssize_t iio_buffer_write_length(struct device *dev, |
| 475 | struct device_attribute *attr, |
| 476 | const char *buf, size_t len) |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 477 | { |
Lars-Peter Clausen | e53f5ac | 2012-05-12 15:39:33 +0200 | [diff] [blame] | 478 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 479 | struct iio_buffer *buffer = indio_dev->buffer; |
Lars-Peter Clausen | 948ad20 | 2012-10-18 14:47:00 +0100 | [diff] [blame] | 480 | unsigned int val; |
| 481 | int ret; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 482 | |
Lars-Peter Clausen | 948ad20 | 2012-10-18 14:47:00 +0100 | [diff] [blame] | 483 | ret = kstrtouint(buf, 10, &val); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 484 | if (ret) |
| 485 | return ret; |
| 486 | |
Lars-Peter Clausen | 3749566 | 2014-11-26 18:55:17 +0100 | [diff] [blame] | 487 | if (val == buffer->length) |
| 488 | return len; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 489 | |
Lars-Peter Clausen | e38c79e | 2011-12-19 15:23:44 +0100 | [diff] [blame] | 490 | mutex_lock(&indio_dev->mlock); |
Lars-Peter Clausen | 705ee2c | 2013-09-15 16:31:00 +0100 | [diff] [blame] | 491 | if (iio_buffer_is_active(indio_dev->buffer)) { |
Lars-Peter Clausen | e38c79e | 2011-12-19 15:23:44 +0100 | [diff] [blame] | 492 | ret = -EBUSY; |
| 493 | } else { |
Lars-Peter Clausen | 8d92db2 | 2014-11-26 18:55:16 +0100 | [diff] [blame] | 494 | buffer->access->set_length(buffer, val); |
Lars-Peter Clausen | e38c79e | 2011-12-19 15:23:44 +0100 | [diff] [blame] | 495 | ret = 0; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 496 | } |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 497 | if (ret) |
| 498 | goto out; |
| 499 | if (buffer->length && buffer->length < buffer->watermark) |
| 500 | buffer->watermark = buffer->length; |
| 501 | out: |
Lars-Peter Clausen | e38c79e | 2011-12-19 15:23:44 +0100 | [diff] [blame] | 502 | mutex_unlock(&indio_dev->mlock); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 503 | |
Lars-Peter Clausen | e38c79e | 2011-12-19 15:23:44 +0100 | [diff] [blame] | 504 | return ret ? ret : len; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 505 | } |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 506 | |
Lars-Peter Clausen | 08e7e0a | 2014-11-26 18:55:15 +0100 | [diff] [blame] | 507 | static ssize_t iio_buffer_show_enable(struct device *dev, |
| 508 | struct device_attribute *attr, |
| 509 | char *buf) |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 510 | { |
Lars-Peter Clausen | e53f5ac | 2012-05-12 15:39:33 +0200 | [diff] [blame] | 511 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Lars-Peter Clausen | 705ee2c | 2013-09-15 16:31:00 +0100 | [diff] [blame] | 512 | return sprintf(buf, "%d\n", iio_buffer_is_active(indio_dev->buffer)); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 513 | } |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 514 | |
Peter Meerwald | 183f417 | 2013-09-18 22:10:00 +0100 | [diff] [blame] | 515 | static int iio_compute_scan_bytes(struct iio_dev *indio_dev, |
| 516 | const unsigned long *mask, bool timestamp) |
Jonathan Cameron | 959d295 | 2011-12-05 21:37:13 +0000 | [diff] [blame] | 517 | { |
Jonathan Cameron | 959d295 | 2011-12-05 21:37:13 +0000 | [diff] [blame] | 518 | const struct iio_chan_spec *ch; |
| 519 | unsigned bytes = 0; |
| 520 | int length, i; |
Jonathan Cameron | 6b3b58e | 2012-04-21 10:09:33 +0100 | [diff] [blame] | 521 | |
| 522 | /* How much space will the demuxed element take? */ |
| 523 | for_each_set_bit(i, mask, |
| 524 | indio_dev->masklength) { |
| 525 | ch = iio_find_channel_from_si(indio_dev, i); |
Srinivas Pandruvada | 0ee8546 | 2014-04-29 00:51:00 +0100 | [diff] [blame] | 526 | if (ch->scan_type.repeat > 1) |
| 527 | length = ch->scan_type.storagebits / 8 * |
| 528 | ch->scan_type.repeat; |
| 529 | else |
| 530 | length = ch->scan_type.storagebits / 8; |
Jonathan Cameron | 6b3b58e | 2012-04-21 10:09:33 +0100 | [diff] [blame] | 531 | bytes = ALIGN(bytes, length); |
| 532 | bytes += length; |
| 533 | } |
| 534 | if (timestamp) { |
| 535 | ch = iio_find_channel_from_si(indio_dev, |
Jonathan Cameron | f126480 | 2012-04-21 10:09:34 +0100 | [diff] [blame] | 536 | indio_dev->scan_index_timestamp); |
Srinivas Pandruvada | 0ee8546 | 2014-04-29 00:51:00 +0100 | [diff] [blame] | 537 | if (ch->scan_type.repeat > 1) |
| 538 | length = ch->scan_type.storagebits / 8 * |
| 539 | ch->scan_type.repeat; |
| 540 | else |
| 541 | length = ch->scan_type.storagebits / 8; |
Jonathan Cameron | 6b3b58e | 2012-04-21 10:09:33 +0100 | [diff] [blame] | 542 | bytes = ALIGN(bytes, length); |
| 543 | bytes += length; |
| 544 | } |
| 545 | return bytes; |
| 546 | } |
| 547 | |
Lars-Peter Clausen | 9e69c93 | 2013-10-04 12:06:00 +0100 | [diff] [blame] | 548 | static void iio_buffer_activate(struct iio_dev *indio_dev, |
| 549 | struct iio_buffer *buffer) |
| 550 | { |
| 551 | iio_buffer_get(buffer); |
| 552 | list_add(&buffer->buffer_list, &indio_dev->buffer_list); |
| 553 | } |
| 554 | |
| 555 | static void iio_buffer_deactivate(struct iio_buffer *buffer) |
| 556 | { |
| 557 | list_del_init(&buffer->buffer_list); |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 558 | wake_up_interruptible(&buffer->pollq); |
Lars-Peter Clausen | 9e69c93 | 2013-10-04 12:06:00 +0100 | [diff] [blame] | 559 | iio_buffer_put(buffer); |
| 560 | } |
| 561 | |
Lars-Peter Clausen | 1250186 | 2015-05-18 13:34:49 +0200 | [diff] [blame] | 562 | static void iio_buffer_deactivate_all(struct iio_dev *indio_dev) |
| 563 | { |
| 564 | struct iio_buffer *buffer, *_buffer; |
| 565 | |
| 566 | list_for_each_entry_safe(buffer, _buffer, |
| 567 | &indio_dev->buffer_list, buffer_list) |
| 568 | iio_buffer_deactivate(buffer); |
| 569 | } |
| 570 | |
Lars-Peter Clausen | 8e05099 | 2013-10-14 17:49:00 +0100 | [diff] [blame] | 571 | static void iio_buffer_update_bytes_per_datum(struct iio_dev *indio_dev, |
| 572 | struct iio_buffer *buffer) |
| 573 | { |
| 574 | unsigned int bytes; |
| 575 | |
| 576 | if (!buffer->access->set_bytes_per_datum) |
| 577 | return; |
| 578 | |
| 579 | bytes = iio_compute_scan_bytes(indio_dev, buffer->scan_mask, |
| 580 | buffer->scan_timestamp); |
| 581 | |
| 582 | buffer->access->set_bytes_per_datum(buffer, bytes); |
| 583 | } |
| 584 | |
Lars-Peter Clausen | fcc1b2f | 2015-05-13 16:04:46 +0200 | [diff] [blame] | 585 | static int iio_buffer_request_update(struct iio_dev *indio_dev, |
| 586 | struct iio_buffer *buffer) |
| 587 | { |
| 588 | int ret; |
| 589 | |
| 590 | iio_buffer_update_bytes_per_datum(indio_dev, buffer); |
| 591 | if (buffer->access->request_update) { |
| 592 | ret = buffer->access->request_update(buffer); |
| 593 | if (ret) { |
| 594 | dev_dbg(&indio_dev->dev, |
| 595 | "Buffer not started: buffer parameter update failed (%d)\n", |
| 596 | ret); |
| 597 | return ret; |
| 598 | } |
| 599 | } |
| 600 | |
| 601 | return 0; |
| 602 | } |
| 603 | |
Lars-Peter Clausen | 248be5a | 2015-05-13 16:04:45 +0200 | [diff] [blame] | 604 | static void iio_free_scan_mask(struct iio_dev *indio_dev, |
| 605 | const unsigned long *mask) |
| 606 | { |
| 607 | /* If the mask is dynamically allocated free it, otherwise do nothing */ |
| 608 | if (!indio_dev->available_scan_masks) |
| 609 | kfree(mask); |
| 610 | } |
| 611 | |
Lars-Peter Clausen | 6e509c4 | 2015-05-18 13:34:47 +0200 | [diff] [blame] | 612 | struct iio_device_config { |
| 613 | unsigned int mode; |
Lars-Peter Clausen | f0566c0 | 2015-10-13 18:10:24 +0200 | [diff] [blame] | 614 | unsigned int watermark; |
Lars-Peter Clausen | 6e509c4 | 2015-05-18 13:34:47 +0200 | [diff] [blame] | 615 | const unsigned long *scan_mask; |
| 616 | unsigned int scan_bytes; |
| 617 | bool scan_timestamp; |
| 618 | }; |
| 619 | |
| 620 | static int iio_verify_update(struct iio_dev *indio_dev, |
| 621 | struct iio_buffer *insert_buffer, struct iio_buffer *remove_buffer, |
| 622 | struct iio_device_config *config) |
| 623 | { |
| 624 | unsigned long *compound_mask; |
| 625 | const unsigned long *scan_mask; |
Lars-Peter Clausen | 1e1ec28 | 2015-05-29 18:14:22 +0200 | [diff] [blame] | 626 | bool strict_scanmask = false; |
Lars-Peter Clausen | 6e509c4 | 2015-05-18 13:34:47 +0200 | [diff] [blame] | 627 | struct iio_buffer *buffer; |
| 628 | bool scan_timestamp; |
Lars-Peter Clausen | 225d59a | 2015-05-29 18:14:21 +0200 | [diff] [blame] | 629 | unsigned int modes; |
Lars-Peter Clausen | 6e509c4 | 2015-05-18 13:34:47 +0200 | [diff] [blame] | 630 | |
| 631 | memset(config, 0, sizeof(*config)); |
| 632 | |
| 633 | /* |
| 634 | * If there is just one buffer and we are removing it there is nothing |
| 635 | * to verify. |
| 636 | */ |
| 637 | if (remove_buffer && !insert_buffer && |
| 638 | list_is_singular(&indio_dev->buffer_list)) |
| 639 | return 0; |
| 640 | |
Lars-Peter Clausen | 225d59a | 2015-05-29 18:14:21 +0200 | [diff] [blame] | 641 | modes = indio_dev->modes; |
| 642 | |
| 643 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { |
| 644 | if (buffer == remove_buffer) |
| 645 | continue; |
| 646 | modes &= buffer->access->modes; |
Lars-Peter Clausen | f0566c0 | 2015-10-13 18:10:24 +0200 | [diff] [blame] | 647 | config->watermark = min(config->watermark, buffer->watermark); |
Lars-Peter Clausen | 225d59a | 2015-05-29 18:14:21 +0200 | [diff] [blame] | 648 | } |
| 649 | |
Lars-Peter Clausen | f0566c0 | 2015-10-13 18:10:24 +0200 | [diff] [blame] | 650 | if (insert_buffer) { |
Lars-Peter Clausen | 225d59a | 2015-05-29 18:14:21 +0200 | [diff] [blame] | 651 | modes &= insert_buffer->access->modes; |
Lars-Peter Clausen | f0566c0 | 2015-10-13 18:10:24 +0200 | [diff] [blame] | 652 | config->watermark = min(config->watermark, |
| 653 | insert_buffer->watermark); |
| 654 | } |
Lars-Peter Clausen | 225d59a | 2015-05-29 18:14:21 +0200 | [diff] [blame] | 655 | |
Lars-Peter Clausen | 6e509c4 | 2015-05-18 13:34:47 +0200 | [diff] [blame] | 656 | /* Definitely possible for devices to support both of these. */ |
Lars-Peter Clausen | 225d59a | 2015-05-29 18:14:21 +0200 | [diff] [blame] | 657 | if ((modes & INDIO_BUFFER_TRIGGERED) && indio_dev->trig) { |
Lars-Peter Clausen | 6e509c4 | 2015-05-18 13:34:47 +0200 | [diff] [blame] | 658 | config->mode = INDIO_BUFFER_TRIGGERED; |
Lars-Peter Clausen | 225d59a | 2015-05-29 18:14:21 +0200 | [diff] [blame] | 659 | } else if (modes & INDIO_BUFFER_HARDWARE) { |
Lars-Peter Clausen | 1e1ec28 | 2015-05-29 18:14:22 +0200 | [diff] [blame] | 660 | /* |
| 661 | * Keep things simple for now and only allow a single buffer to |
| 662 | * be connected in hardware mode. |
| 663 | */ |
| 664 | if (insert_buffer && !list_empty(&indio_dev->buffer_list)) |
| 665 | return -EINVAL; |
Lars-Peter Clausen | 6e509c4 | 2015-05-18 13:34:47 +0200 | [diff] [blame] | 666 | config->mode = INDIO_BUFFER_HARDWARE; |
Lars-Peter Clausen | 1e1ec28 | 2015-05-29 18:14:22 +0200 | [diff] [blame] | 667 | strict_scanmask = true; |
Lars-Peter Clausen | 225d59a | 2015-05-29 18:14:21 +0200 | [diff] [blame] | 668 | } else if (modes & INDIO_BUFFER_SOFTWARE) { |
Lars-Peter Clausen | 6e509c4 | 2015-05-18 13:34:47 +0200 | [diff] [blame] | 669 | config->mode = INDIO_BUFFER_SOFTWARE; |
| 670 | } else { |
| 671 | /* Can only occur on first buffer */ |
| 672 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
| 673 | dev_dbg(&indio_dev->dev, "Buffer not started: no trigger\n"); |
| 674 | return -EINVAL; |
| 675 | } |
| 676 | |
| 677 | /* What scan mask do we actually have? */ |
| 678 | compound_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), |
| 679 | sizeof(long), GFP_KERNEL); |
| 680 | if (compound_mask == NULL) |
| 681 | return -ENOMEM; |
| 682 | |
| 683 | scan_timestamp = false; |
| 684 | |
| 685 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { |
| 686 | if (buffer == remove_buffer) |
| 687 | continue; |
| 688 | bitmap_or(compound_mask, compound_mask, buffer->scan_mask, |
| 689 | indio_dev->masklength); |
| 690 | scan_timestamp |= buffer->scan_timestamp; |
| 691 | } |
| 692 | |
| 693 | if (insert_buffer) { |
| 694 | bitmap_or(compound_mask, compound_mask, |
| 695 | insert_buffer->scan_mask, indio_dev->masklength); |
| 696 | scan_timestamp |= insert_buffer->scan_timestamp; |
| 697 | } |
| 698 | |
| 699 | if (indio_dev->available_scan_masks) { |
| 700 | scan_mask = iio_scan_mask_match(indio_dev->available_scan_masks, |
| 701 | indio_dev->masklength, |
Lars-Peter Clausen | 1e1ec28 | 2015-05-29 18:14:22 +0200 | [diff] [blame] | 702 | compound_mask, |
| 703 | strict_scanmask); |
Lars-Peter Clausen | 6e509c4 | 2015-05-18 13:34:47 +0200 | [diff] [blame] | 704 | kfree(compound_mask); |
| 705 | if (scan_mask == NULL) |
| 706 | return -EINVAL; |
| 707 | } else { |
| 708 | scan_mask = compound_mask; |
| 709 | } |
| 710 | |
| 711 | config->scan_bytes = iio_compute_scan_bytes(indio_dev, |
| 712 | scan_mask, scan_timestamp); |
| 713 | config->scan_mask = scan_mask; |
| 714 | config->scan_timestamp = scan_timestamp; |
| 715 | |
| 716 | return 0; |
| 717 | } |
| 718 | |
Lars-Peter Clausen | 623d74e | 2015-05-18 13:34:48 +0200 | [diff] [blame] | 719 | static int iio_enable_buffers(struct iio_dev *indio_dev, |
| 720 | struct iio_device_config *config) |
| 721 | { |
| 722 | int ret; |
| 723 | |
| 724 | indio_dev->active_scan_mask = config->scan_mask; |
| 725 | indio_dev->scan_timestamp = config->scan_timestamp; |
| 726 | indio_dev->scan_bytes = config->scan_bytes; |
| 727 | |
| 728 | iio_update_demux(indio_dev); |
| 729 | |
| 730 | /* Wind up again */ |
| 731 | if (indio_dev->setup_ops->preenable) { |
| 732 | ret = indio_dev->setup_ops->preenable(indio_dev); |
| 733 | if (ret) { |
| 734 | dev_dbg(&indio_dev->dev, |
| 735 | "Buffer not started: buffer preenable failed (%d)\n", ret); |
| 736 | goto err_undo_config; |
| 737 | } |
| 738 | } |
| 739 | |
| 740 | if (indio_dev->info->update_scan_mode) { |
| 741 | ret = indio_dev->info |
| 742 | ->update_scan_mode(indio_dev, |
| 743 | indio_dev->active_scan_mask); |
| 744 | if (ret < 0) { |
| 745 | dev_dbg(&indio_dev->dev, |
| 746 | "Buffer not started: update scan mode failed (%d)\n", |
| 747 | ret); |
| 748 | goto err_run_postdisable; |
| 749 | } |
| 750 | } |
| 751 | |
Lars-Peter Clausen | f0566c0 | 2015-10-13 18:10:24 +0200 | [diff] [blame] | 752 | if (indio_dev->info->hwfifo_set_watermark) |
| 753 | indio_dev->info->hwfifo_set_watermark(indio_dev, |
| 754 | config->watermark); |
| 755 | |
Lars-Peter Clausen | 623d74e | 2015-05-18 13:34:48 +0200 | [diff] [blame] | 756 | indio_dev->currentmode = config->mode; |
| 757 | |
| 758 | if (indio_dev->setup_ops->postenable) { |
| 759 | ret = indio_dev->setup_ops->postenable(indio_dev); |
| 760 | if (ret) { |
| 761 | dev_dbg(&indio_dev->dev, |
| 762 | "Buffer not started: postenable failed (%d)\n", ret); |
| 763 | goto err_run_postdisable; |
| 764 | } |
| 765 | } |
| 766 | |
| 767 | return 0; |
| 768 | |
| 769 | err_run_postdisable: |
| 770 | indio_dev->currentmode = INDIO_DIRECT_MODE; |
| 771 | if (indio_dev->setup_ops->postdisable) |
| 772 | indio_dev->setup_ops->postdisable(indio_dev); |
| 773 | err_undo_config: |
| 774 | indio_dev->active_scan_mask = NULL; |
| 775 | |
| 776 | return ret; |
| 777 | } |
| 778 | |
| 779 | static int iio_disable_buffers(struct iio_dev *indio_dev) |
| 780 | { |
Lars-Peter Clausen | 1250186 | 2015-05-18 13:34:49 +0200 | [diff] [blame] | 781 | int ret = 0; |
| 782 | int ret2; |
Lars-Peter Clausen | 623d74e | 2015-05-18 13:34:48 +0200 | [diff] [blame] | 783 | |
| 784 | /* Wind down existing buffers - iff there are any */ |
| 785 | if (list_empty(&indio_dev->buffer_list)) |
| 786 | return 0; |
| 787 | |
Lars-Peter Clausen | 1250186 | 2015-05-18 13:34:49 +0200 | [diff] [blame] | 788 | /* |
| 789 | * If things go wrong at some step in disable we still need to continue |
| 790 | * to perform the other steps, otherwise we leave the device in a |
| 791 | * inconsistent state. We return the error code for the first error we |
| 792 | * encountered. |
| 793 | */ |
| 794 | |
Lars-Peter Clausen | 623d74e | 2015-05-18 13:34:48 +0200 | [diff] [blame] | 795 | if (indio_dev->setup_ops->predisable) { |
Lars-Peter Clausen | 1250186 | 2015-05-18 13:34:49 +0200 | [diff] [blame] | 796 | ret2 = indio_dev->setup_ops->predisable(indio_dev); |
| 797 | if (ret2 && !ret) |
| 798 | ret = ret2; |
Lars-Peter Clausen | 623d74e | 2015-05-18 13:34:48 +0200 | [diff] [blame] | 799 | } |
| 800 | |
| 801 | indio_dev->currentmode = INDIO_DIRECT_MODE; |
| 802 | |
| 803 | if (indio_dev->setup_ops->postdisable) { |
Lars-Peter Clausen | 1250186 | 2015-05-18 13:34:49 +0200 | [diff] [blame] | 804 | ret2 = indio_dev->setup_ops->postdisable(indio_dev); |
| 805 | if (ret2 && !ret) |
| 806 | ret = ret2; |
Lars-Peter Clausen | 623d74e | 2015-05-18 13:34:48 +0200 | [diff] [blame] | 807 | } |
| 808 | |
Lars-Peter Clausen | 1250186 | 2015-05-18 13:34:49 +0200 | [diff] [blame] | 809 | iio_free_scan_mask(indio_dev, indio_dev->active_scan_mask); |
| 810 | indio_dev->active_scan_mask = NULL; |
| 811 | |
| 812 | return ret; |
Lars-Peter Clausen | 623d74e | 2015-05-18 13:34:48 +0200 | [diff] [blame] | 813 | } |
| 814 | |
Lars-Peter Clausen | a951945 | 2013-10-04 12:07:00 +0100 | [diff] [blame] | 815 | static int __iio_update_buffers(struct iio_dev *indio_dev, |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 816 | struct iio_buffer *insert_buffer, |
| 817 | struct iio_buffer *remove_buffer) |
Jonathan Cameron | 6b3b58e | 2012-04-21 10:09:33 +0100 | [diff] [blame] | 818 | { |
Lars-Peter Clausen | 6e509c4 | 2015-05-18 13:34:47 +0200 | [diff] [blame] | 819 | struct iio_device_config new_config; |
Lars-Peter Clausen | 1250186 | 2015-05-18 13:34:49 +0200 | [diff] [blame] | 820 | int ret; |
Lars-Peter Clausen | 6e509c4 | 2015-05-18 13:34:47 +0200 | [diff] [blame] | 821 | |
| 822 | ret = iio_verify_update(indio_dev, insert_buffer, remove_buffer, |
| 823 | &new_config); |
| 824 | if (ret) |
| 825 | return ret; |
Jonathan Cameron | 959d295 | 2011-12-05 21:37:13 +0000 | [diff] [blame] | 826 | |
Lars-Peter Clausen | fcc1b2f | 2015-05-13 16:04:46 +0200 | [diff] [blame] | 827 | if (insert_buffer) { |
| 828 | ret = iio_buffer_request_update(indio_dev, insert_buffer); |
| 829 | if (ret) |
Lars-Peter Clausen | 6e509c4 | 2015-05-18 13:34:47 +0200 | [diff] [blame] | 830 | goto err_free_config; |
Lars-Peter Clausen | fcc1b2f | 2015-05-13 16:04:46 +0200 | [diff] [blame] | 831 | } |
| 832 | |
Lars-Peter Clausen | 623d74e | 2015-05-18 13:34:48 +0200 | [diff] [blame] | 833 | ret = iio_disable_buffers(indio_dev); |
Lars-Peter Clausen | 1250186 | 2015-05-18 13:34:49 +0200 | [diff] [blame] | 834 | if (ret) |
| 835 | goto err_deactivate_all; |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 836 | |
| 837 | if (remove_buffer) |
Lars-Peter Clausen | 9e69c93 | 2013-10-04 12:06:00 +0100 | [diff] [blame] | 838 | iio_buffer_deactivate(remove_buffer); |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 839 | if (insert_buffer) |
Lars-Peter Clausen | 9e69c93 | 2013-10-04 12:06:00 +0100 | [diff] [blame] | 840 | iio_buffer_activate(indio_dev, insert_buffer); |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 841 | |
| 842 | /* If no buffers in list, we are done */ |
Lars-Peter Clausen | 1250186 | 2015-05-18 13:34:49 +0200 | [diff] [blame] | 843 | if (list_empty(&indio_dev->buffer_list)) |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 844 | return 0; |
Jonathan Cameron | 959d295 | 2011-12-05 21:37:13 +0000 | [diff] [blame] | 845 | |
Lars-Peter Clausen | 623d74e | 2015-05-18 13:34:48 +0200 | [diff] [blame] | 846 | ret = iio_enable_buffers(indio_dev, &new_config); |
Lars-Peter Clausen | 1250186 | 2015-05-18 13:34:49 +0200 | [diff] [blame] | 847 | if (ret) |
| 848 | goto err_deactivate_all; |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 849 | |
Lars-Peter Clausen | 6e509c4 | 2015-05-18 13:34:47 +0200 | [diff] [blame] | 850 | return 0; |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 851 | |
Lars-Peter Clausen | 1250186 | 2015-05-18 13:34:49 +0200 | [diff] [blame] | 852 | err_deactivate_all: |
| 853 | /* |
| 854 | * We've already verified that the config is valid earlier. If things go |
| 855 | * wrong in either enable or disable the most likely reason is an IO |
| 856 | * error from the device. In this case there is no good recovery |
| 857 | * strategy. Just make sure to disable everything and leave the device |
| 858 | * in a sane state. With a bit of luck the device might come back to |
| 859 | * life again later and userspace can try again. |
| 860 | */ |
| 861 | iio_buffer_deactivate_all(indio_dev); |
| 862 | |
Lars-Peter Clausen | 6e509c4 | 2015-05-18 13:34:47 +0200 | [diff] [blame] | 863 | err_free_config: |
| 864 | iio_free_scan_mask(indio_dev, new_config.scan_mask); |
| 865 | return ret; |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 866 | } |
Lars-Peter Clausen | a951945 | 2013-10-04 12:07:00 +0100 | [diff] [blame] | 867 | |
| 868 | int iio_update_buffers(struct iio_dev *indio_dev, |
| 869 | struct iio_buffer *insert_buffer, |
| 870 | struct iio_buffer *remove_buffer) |
| 871 | { |
| 872 | int ret; |
| 873 | |
Lars-Peter Clausen | 3909fab | 2013-10-04 12:07:00 +0100 | [diff] [blame] | 874 | if (insert_buffer == remove_buffer) |
| 875 | return 0; |
| 876 | |
Lars-Peter Clausen | a951945 | 2013-10-04 12:07:00 +0100 | [diff] [blame] | 877 | mutex_lock(&indio_dev->info_exist_lock); |
| 878 | mutex_lock(&indio_dev->mlock); |
| 879 | |
Lars-Peter Clausen | 3909fab | 2013-10-04 12:07:00 +0100 | [diff] [blame] | 880 | if (insert_buffer && iio_buffer_is_active(insert_buffer)) |
| 881 | insert_buffer = NULL; |
| 882 | |
| 883 | if (remove_buffer && !iio_buffer_is_active(remove_buffer)) |
| 884 | remove_buffer = NULL; |
| 885 | |
| 886 | if (!insert_buffer && !remove_buffer) { |
| 887 | ret = 0; |
| 888 | goto out_unlock; |
| 889 | } |
| 890 | |
Lars-Peter Clausen | a951945 | 2013-10-04 12:07:00 +0100 | [diff] [blame] | 891 | if (indio_dev->info == NULL) { |
| 892 | ret = -ENODEV; |
| 893 | goto out_unlock; |
| 894 | } |
| 895 | |
| 896 | ret = __iio_update_buffers(indio_dev, insert_buffer, remove_buffer); |
| 897 | |
| 898 | out_unlock: |
| 899 | mutex_unlock(&indio_dev->mlock); |
| 900 | mutex_unlock(&indio_dev->info_exist_lock); |
| 901 | |
| 902 | return ret; |
| 903 | } |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 904 | EXPORT_SYMBOL_GPL(iio_update_buffers); |
| 905 | |
Lars-Peter Clausen | 623d74e | 2015-05-18 13:34:48 +0200 | [diff] [blame] | 906 | void iio_disable_all_buffers(struct iio_dev *indio_dev) |
| 907 | { |
Lars-Peter Clausen | 623d74e | 2015-05-18 13:34:48 +0200 | [diff] [blame] | 908 | iio_disable_buffers(indio_dev); |
Lars-Peter Clausen | 1250186 | 2015-05-18 13:34:49 +0200 | [diff] [blame] | 909 | iio_buffer_deactivate_all(indio_dev); |
Lars-Peter Clausen | 623d74e | 2015-05-18 13:34:48 +0200 | [diff] [blame] | 910 | } |
| 911 | |
Lars-Peter Clausen | 08e7e0a | 2014-11-26 18:55:15 +0100 | [diff] [blame] | 912 | static ssize_t iio_buffer_store_enable(struct device *dev, |
| 913 | struct device_attribute *attr, |
| 914 | const char *buf, |
| 915 | size_t len) |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 916 | { |
| 917 | int ret; |
| 918 | bool requested_state; |
| 919 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 920 | bool inlist; |
| 921 | |
| 922 | ret = strtobool(buf, &requested_state); |
| 923 | if (ret < 0) |
| 924 | return ret; |
| 925 | |
| 926 | mutex_lock(&indio_dev->mlock); |
| 927 | |
| 928 | /* Find out if it is in the list */ |
Lars-Peter Clausen | 705ee2c | 2013-09-15 16:31:00 +0100 | [diff] [blame] | 929 | inlist = iio_buffer_is_active(indio_dev->buffer); |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 930 | /* Already in desired state */ |
| 931 | if (inlist == requested_state) |
| 932 | goto done; |
| 933 | |
| 934 | if (requested_state) |
Lars-Peter Clausen | a951945 | 2013-10-04 12:07:00 +0100 | [diff] [blame] | 935 | ret = __iio_update_buffers(indio_dev, |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 936 | indio_dev->buffer, NULL); |
| 937 | else |
Lars-Peter Clausen | a951945 | 2013-10-04 12:07:00 +0100 | [diff] [blame] | 938 | ret = __iio_update_buffers(indio_dev, |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 939 | NULL, indio_dev->buffer); |
| 940 | |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 941 | done: |
| 942 | mutex_unlock(&indio_dev->mlock); |
| 943 | return (ret < 0) ? ret : len; |
| 944 | } |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 945 | |
Lars-Peter Clausen | d967cb6 | 2014-11-26 18:55:14 +0100 | [diff] [blame] | 946 | static const char * const iio_scan_elements_group_name = "scan_elements"; |
| 947 | |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 948 | static ssize_t iio_buffer_show_watermark(struct device *dev, |
| 949 | struct device_attribute *attr, |
| 950 | char *buf) |
| 951 | { |
| 952 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| 953 | struct iio_buffer *buffer = indio_dev->buffer; |
| 954 | |
| 955 | return sprintf(buf, "%u\n", buffer->watermark); |
| 956 | } |
| 957 | |
| 958 | static ssize_t iio_buffer_store_watermark(struct device *dev, |
| 959 | struct device_attribute *attr, |
| 960 | const char *buf, |
| 961 | size_t len) |
| 962 | { |
| 963 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| 964 | struct iio_buffer *buffer = indio_dev->buffer; |
| 965 | unsigned int val; |
| 966 | int ret; |
| 967 | |
| 968 | ret = kstrtouint(buf, 10, &val); |
| 969 | if (ret) |
| 970 | return ret; |
| 971 | if (!val) |
| 972 | return -EINVAL; |
| 973 | |
| 974 | mutex_lock(&indio_dev->mlock); |
| 975 | |
| 976 | if (val > buffer->length) { |
| 977 | ret = -EINVAL; |
| 978 | goto out; |
| 979 | } |
| 980 | |
| 981 | if (iio_buffer_is_active(indio_dev->buffer)) { |
| 982 | ret = -EBUSY; |
| 983 | goto out; |
| 984 | } |
| 985 | |
| 986 | buffer->watermark = val; |
| 987 | out: |
| 988 | mutex_unlock(&indio_dev->mlock); |
| 989 | |
| 990 | return ret ? ret : len; |
| 991 | } |
| 992 | |
Lars-Peter Clausen | 08e7e0a | 2014-11-26 18:55:15 +0100 | [diff] [blame] | 993 | static DEVICE_ATTR(length, S_IRUGO | S_IWUSR, iio_buffer_read_length, |
| 994 | iio_buffer_write_length); |
Lars-Peter Clausen | 8d92db2 | 2014-11-26 18:55:16 +0100 | [diff] [blame] | 995 | static struct device_attribute dev_attr_length_ro = __ATTR(length, |
| 996 | S_IRUGO, iio_buffer_read_length, NULL); |
Lars-Peter Clausen | 08e7e0a | 2014-11-26 18:55:15 +0100 | [diff] [blame] | 997 | static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, |
| 998 | iio_buffer_show_enable, iio_buffer_store_enable); |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 999 | static DEVICE_ATTR(watermark, S_IRUGO | S_IWUSR, |
| 1000 | iio_buffer_show_watermark, iio_buffer_store_watermark); |
Lars-Peter Clausen | b440655 | 2015-10-13 18:10:26 +0200 | [diff] [blame^] | 1001 | static struct device_attribute dev_attr_watermark_ro = __ATTR(watermark, |
| 1002 | S_IRUGO, iio_buffer_show_watermark, NULL); |
Lars-Peter Clausen | 08e7e0a | 2014-11-26 18:55:15 +0100 | [diff] [blame] | 1003 | |
Octavian Purdila | 6da9b38 | 2015-01-31 02:00:00 +0200 | [diff] [blame] | 1004 | static struct attribute *iio_buffer_attrs[] = { |
| 1005 | &dev_attr_length.attr, |
| 1006 | &dev_attr_enable.attr, |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 1007 | &dev_attr_watermark.attr, |
Octavian Purdila | 6da9b38 | 2015-01-31 02:00:00 +0200 | [diff] [blame] | 1008 | }; |
| 1009 | |
Lars-Peter Clausen | d967cb6 | 2014-11-26 18:55:14 +0100 | [diff] [blame] | 1010 | int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev) |
| 1011 | { |
| 1012 | struct iio_dev_attr *p; |
| 1013 | struct attribute **attr; |
| 1014 | struct iio_buffer *buffer = indio_dev->buffer; |
| 1015 | int ret, i, attrn, attrcount, attrcount_orig = 0; |
| 1016 | const struct iio_chan_spec *channels; |
| 1017 | |
Lars-Peter Clausen | 629bc02 | 2015-05-29 18:14:20 +0200 | [diff] [blame] | 1018 | channels = indio_dev->channels; |
| 1019 | if (channels) { |
| 1020 | int ml = indio_dev->masklength; |
| 1021 | |
| 1022 | for (i = 0; i < indio_dev->num_channels; i++) |
| 1023 | ml = max(ml, channels[i].scan_index + 1); |
| 1024 | indio_dev->masklength = ml; |
| 1025 | } |
| 1026 | |
Lars-Peter Clausen | d967cb6 | 2014-11-26 18:55:14 +0100 | [diff] [blame] | 1027 | if (!buffer) |
| 1028 | return 0; |
| 1029 | |
Lars-Peter Clausen | 08e7e0a | 2014-11-26 18:55:15 +0100 | [diff] [blame] | 1030 | attrcount = 0; |
| 1031 | if (buffer->attrs) { |
| 1032 | while (buffer->attrs[attrcount] != NULL) |
| 1033 | attrcount++; |
| 1034 | } |
| 1035 | |
Octavian Purdila | 6da9b38 | 2015-01-31 02:00:00 +0200 | [diff] [blame] | 1036 | attr = kcalloc(attrcount + ARRAY_SIZE(iio_buffer_attrs) + 1, |
| 1037 | sizeof(struct attribute *), GFP_KERNEL); |
| 1038 | if (!attr) |
Lars-Peter Clausen | 08e7e0a | 2014-11-26 18:55:15 +0100 | [diff] [blame] | 1039 | return -ENOMEM; |
| 1040 | |
Octavian Purdila | 6da9b38 | 2015-01-31 02:00:00 +0200 | [diff] [blame] | 1041 | memcpy(attr, iio_buffer_attrs, sizeof(iio_buffer_attrs)); |
| 1042 | if (!buffer->access->set_length) |
| 1043 | attr[0] = &dev_attr_length_ro.attr; |
| 1044 | |
Lars-Peter Clausen | b440655 | 2015-10-13 18:10:26 +0200 | [diff] [blame^] | 1045 | if (buffer->access->flags & INDIO_BUFFER_FLAG_FIXED_WATERMARK) |
| 1046 | attr[2] = &dev_attr_watermark_ro.attr; |
| 1047 | |
Lars-Peter Clausen | 08e7e0a | 2014-11-26 18:55:15 +0100 | [diff] [blame] | 1048 | if (buffer->attrs) |
Octavian Purdila | 6da9b38 | 2015-01-31 02:00:00 +0200 | [diff] [blame] | 1049 | memcpy(&attr[ARRAY_SIZE(iio_buffer_attrs)], buffer->attrs, |
| 1050 | sizeof(struct attribute *) * attrcount); |
| 1051 | |
| 1052 | attr[attrcount + ARRAY_SIZE(iio_buffer_attrs)] = NULL; |
| 1053 | |
| 1054 | buffer->buffer_group.name = "buffer"; |
| 1055 | buffer->buffer_group.attrs = attr; |
Lars-Peter Clausen | 08e7e0a | 2014-11-26 18:55:15 +0100 | [diff] [blame] | 1056 | |
| 1057 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->buffer_group; |
| 1058 | |
Lars-Peter Clausen | d967cb6 | 2014-11-26 18:55:14 +0100 | [diff] [blame] | 1059 | if (buffer->scan_el_attrs != NULL) { |
| 1060 | attr = buffer->scan_el_attrs->attrs; |
| 1061 | while (*attr++ != NULL) |
| 1062 | attrcount_orig++; |
| 1063 | } |
| 1064 | attrcount = attrcount_orig; |
| 1065 | INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list); |
| 1066 | channels = indio_dev->channels; |
| 1067 | if (channels) { |
| 1068 | /* new magic */ |
| 1069 | for (i = 0; i < indio_dev->num_channels; i++) { |
| 1070 | if (channels[i].scan_index < 0) |
| 1071 | continue; |
| 1072 | |
Lars-Peter Clausen | d967cb6 | 2014-11-26 18:55:14 +0100 | [diff] [blame] | 1073 | ret = iio_buffer_add_channel_sysfs(indio_dev, |
| 1074 | &channels[i]); |
| 1075 | if (ret < 0) |
| 1076 | goto error_cleanup_dynamic; |
| 1077 | attrcount += ret; |
| 1078 | if (channels[i].type == IIO_TIMESTAMP) |
| 1079 | indio_dev->scan_index_timestamp = |
| 1080 | channels[i].scan_index; |
| 1081 | } |
| 1082 | if (indio_dev->masklength && buffer->scan_mask == NULL) { |
| 1083 | buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength), |
| 1084 | sizeof(*buffer->scan_mask), |
| 1085 | GFP_KERNEL); |
| 1086 | if (buffer->scan_mask == NULL) { |
| 1087 | ret = -ENOMEM; |
| 1088 | goto error_cleanup_dynamic; |
| 1089 | } |
| 1090 | } |
| 1091 | } |
| 1092 | |
| 1093 | buffer->scan_el_group.name = iio_scan_elements_group_name; |
| 1094 | |
| 1095 | buffer->scan_el_group.attrs = kcalloc(attrcount + 1, |
| 1096 | sizeof(buffer->scan_el_group.attrs[0]), |
| 1097 | GFP_KERNEL); |
| 1098 | if (buffer->scan_el_group.attrs == NULL) { |
| 1099 | ret = -ENOMEM; |
| 1100 | goto error_free_scan_mask; |
| 1101 | } |
| 1102 | if (buffer->scan_el_attrs) |
| 1103 | memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs, |
| 1104 | sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig); |
| 1105 | attrn = attrcount_orig; |
| 1106 | |
| 1107 | list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l) |
| 1108 | buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr; |
| 1109 | indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group; |
| 1110 | |
| 1111 | return 0; |
| 1112 | |
| 1113 | error_free_scan_mask: |
| 1114 | kfree(buffer->scan_mask); |
| 1115 | error_cleanup_dynamic: |
| 1116 | iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list); |
Lars-Peter Clausen | 08e7e0a | 2014-11-26 18:55:15 +0100 | [diff] [blame] | 1117 | kfree(indio_dev->buffer->buffer_group.attrs); |
Lars-Peter Clausen | d967cb6 | 2014-11-26 18:55:14 +0100 | [diff] [blame] | 1118 | |
| 1119 | return ret; |
| 1120 | } |
| 1121 | |
| 1122 | void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev) |
| 1123 | { |
| 1124 | if (!indio_dev->buffer) |
| 1125 | return; |
| 1126 | |
| 1127 | kfree(indio_dev->buffer->scan_mask); |
Lars-Peter Clausen | 08e7e0a | 2014-11-26 18:55:15 +0100 | [diff] [blame] | 1128 | kfree(indio_dev->buffer->buffer_group.attrs); |
Lars-Peter Clausen | d967cb6 | 2014-11-26 18:55:14 +0100 | [diff] [blame] | 1129 | kfree(indio_dev->buffer->scan_el_group.attrs); |
| 1130 | iio_free_chan_devattr_list(&indio_dev->buffer->scan_el_dev_attr_list); |
| 1131 | } |
| 1132 | |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 1133 | /** |
Lars-Peter Clausen | 8163663 | 2012-07-09 10:00:00 +0100 | [diff] [blame] | 1134 | * iio_validate_scan_mask_onehot() - Validates that exactly one channel is selected |
| 1135 | * @indio_dev: the iio device |
| 1136 | * @mask: scan mask to be checked |
| 1137 | * |
| 1138 | * Return true if exactly one bit is set in the scan mask, false otherwise. It |
| 1139 | * can be used for devices where only one channel can be active for sampling at |
| 1140 | * a time. |
| 1141 | */ |
| 1142 | bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev, |
| 1143 | const unsigned long *mask) |
| 1144 | { |
| 1145 | return bitmap_weight(mask, indio_dev->masklength) == 1; |
| 1146 | } |
| 1147 | EXPORT_SYMBOL_GPL(iio_validate_scan_mask_onehot); |
| 1148 | |
Jonathan Cameron | f79a909 | 2011-12-05 22:18:29 +0000 | [diff] [blame] | 1149 | int iio_scan_mask_query(struct iio_dev *indio_dev, |
| 1150 | struct iio_buffer *buffer, int bit) |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 1151 | { |
Jonathan Cameron | f8c6f4e | 2011-10-06 17:14:35 +0100 | [diff] [blame] | 1152 | if (bit > indio_dev->masklength) |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 1153 | return -EINVAL; |
| 1154 | |
| 1155 | if (!buffer->scan_mask) |
| 1156 | return 0; |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 1157 | |
Alec Berg | 2076a20 | 2014-03-19 18:50:00 +0000 | [diff] [blame] | 1158 | /* Ensure return value is 0 or 1. */ |
| 1159 | return !!test_bit(bit, buffer->scan_mask); |
Jonathan Cameron | 14555b1 | 2011-09-21 11:15:57 +0100 | [diff] [blame] | 1160 | }; |
| 1161 | EXPORT_SYMBOL_GPL(iio_scan_mask_query); |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1162 | |
| 1163 | /** |
Cristina Opriceana | 0123635 | 2015-07-24 16:18:09 +0300 | [diff] [blame] | 1164 | * struct iio_demux_table - table describing demux memcpy ops |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1165 | * @from: index to copy from |
Peter Meerwald | 99698b4 | 2012-08-26 13:43:00 +0100 | [diff] [blame] | 1166 | * @to: index to copy to |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1167 | * @length: how many bytes to copy |
| 1168 | * @l: list head used for management |
| 1169 | */ |
| 1170 | struct iio_demux_table { |
| 1171 | unsigned from; |
| 1172 | unsigned to; |
| 1173 | unsigned length; |
| 1174 | struct list_head l; |
| 1175 | }; |
| 1176 | |
Lars-Peter Clausen | 5d65d92 | 2013-09-15 17:50:00 +0100 | [diff] [blame] | 1177 | static const void *iio_demux(struct iio_buffer *buffer, |
| 1178 | const void *datain) |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1179 | { |
| 1180 | struct iio_demux_table *t; |
| 1181 | |
| 1182 | if (list_empty(&buffer->demux_list)) |
| 1183 | return datain; |
| 1184 | list_for_each_entry(t, &buffer->demux_list, l) |
| 1185 | memcpy(buffer->demux_bounce + t->to, |
| 1186 | datain + t->from, t->length); |
| 1187 | |
| 1188 | return buffer->demux_bounce; |
| 1189 | } |
| 1190 | |
Lars-Peter Clausen | 5d65d92 | 2013-09-15 17:50:00 +0100 | [diff] [blame] | 1191 | static int iio_push_to_buffer(struct iio_buffer *buffer, const void *data) |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1192 | { |
Lars-Peter Clausen | 5d65d92 | 2013-09-15 17:50:00 +0100 | [diff] [blame] | 1193 | const void *dataout = iio_demux(buffer, data); |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 1194 | int ret; |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1195 | |
Josselin Costanzi | 37d3455 | 2015-03-22 20:33:38 +0200 | [diff] [blame] | 1196 | ret = buffer->access->store_to(buffer, dataout); |
| 1197 | if (ret) |
| 1198 | return ret; |
| 1199 | |
| 1200 | /* |
| 1201 | * We can't just test for watermark to decide if we wake the poll queue |
| 1202 | * because read may request less samples than the watermark. |
| 1203 | */ |
| 1204 | wake_up_interruptible_poll(&buffer->pollq, POLLIN | POLLRDNORM); |
| 1205 | return 0; |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1206 | } |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1207 | |
Jonathan Cameron | 842cd10 | 2012-04-21 10:09:45 +0100 | [diff] [blame] | 1208 | static void iio_buffer_demux_free(struct iio_buffer *buffer) |
| 1209 | { |
| 1210 | struct iio_demux_table *p, *q; |
| 1211 | list_for_each_entry_safe(p, q, &buffer->demux_list, l) { |
| 1212 | list_del(&p->l); |
| 1213 | kfree(p); |
| 1214 | } |
| 1215 | } |
| 1216 | |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 1217 | |
Lars-Peter Clausen | 5d65d92 | 2013-09-15 17:50:00 +0100 | [diff] [blame] | 1218 | int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data) |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 1219 | { |
| 1220 | int ret; |
| 1221 | struct iio_buffer *buf; |
| 1222 | |
| 1223 | list_for_each_entry(buf, &indio_dev->buffer_list, buffer_list) { |
| 1224 | ret = iio_push_to_buffer(buf, data); |
| 1225 | if (ret < 0) |
| 1226 | return ret; |
| 1227 | } |
| 1228 | |
| 1229 | return 0; |
| 1230 | } |
| 1231 | EXPORT_SYMBOL_GPL(iio_push_to_buffers); |
| 1232 | |
Lars-Peter Clausen | cbe88bc | 2014-07-17 16:59:00 +0100 | [diff] [blame] | 1233 | static int iio_buffer_add_demux(struct iio_buffer *buffer, |
| 1234 | struct iio_demux_table **p, unsigned int in_loc, unsigned int out_loc, |
| 1235 | unsigned int length) |
| 1236 | { |
| 1237 | |
| 1238 | if (*p && (*p)->from + (*p)->length == in_loc && |
| 1239 | (*p)->to + (*p)->length == out_loc) { |
| 1240 | (*p)->length += length; |
| 1241 | } else { |
Jonathan Cameron | 7cdca178 | 2014-08-08 09:43:00 +0100 | [diff] [blame] | 1242 | *p = kmalloc(sizeof(**p), GFP_KERNEL); |
Lars-Peter Clausen | cbe88bc | 2014-07-17 16:59:00 +0100 | [diff] [blame] | 1243 | if (*p == NULL) |
| 1244 | return -ENOMEM; |
| 1245 | (*p)->from = in_loc; |
| 1246 | (*p)->to = out_loc; |
| 1247 | (*p)->length = length; |
| 1248 | list_add_tail(&(*p)->l, &buffer->demux_list); |
| 1249 | } |
| 1250 | |
| 1251 | return 0; |
| 1252 | } |
| 1253 | |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 1254 | static int iio_buffer_update_demux(struct iio_dev *indio_dev, |
| 1255 | struct iio_buffer *buffer) |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1256 | { |
| 1257 | const struct iio_chan_spec *ch; |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1258 | int ret, in_ind = -1, out_ind, length; |
| 1259 | unsigned in_loc = 0, out_loc = 0; |
Lars-Peter Clausen | cbe88bc | 2014-07-17 16:59:00 +0100 | [diff] [blame] | 1260 | struct iio_demux_table *p = NULL; |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1261 | |
| 1262 | /* Clear out any old demux */ |
Jonathan Cameron | 842cd10 | 2012-04-21 10:09:45 +0100 | [diff] [blame] | 1263 | iio_buffer_demux_free(buffer); |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1264 | kfree(buffer->demux_bounce); |
| 1265 | buffer->demux_bounce = NULL; |
| 1266 | |
| 1267 | /* First work out which scan mode we will actually have */ |
| 1268 | if (bitmap_equal(indio_dev->active_scan_mask, |
| 1269 | buffer->scan_mask, |
| 1270 | indio_dev->masklength)) |
| 1271 | return 0; |
| 1272 | |
| 1273 | /* Now we have the two masks, work from least sig and build up sizes */ |
| 1274 | for_each_set_bit(out_ind, |
Lars-Peter Clausen | 61bd55c | 2014-07-17 16:59:00 +0100 | [diff] [blame] | 1275 | buffer->scan_mask, |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1276 | indio_dev->masklength) { |
| 1277 | in_ind = find_next_bit(indio_dev->active_scan_mask, |
| 1278 | indio_dev->masklength, |
| 1279 | in_ind + 1); |
| 1280 | while (in_ind != out_ind) { |
| 1281 | in_ind = find_next_bit(indio_dev->active_scan_mask, |
| 1282 | indio_dev->masklength, |
| 1283 | in_ind + 1); |
| 1284 | ch = iio_find_channel_from_si(indio_dev, in_ind); |
Srinivas Pandruvada | 0ee8546 | 2014-04-29 00:51:00 +0100 | [diff] [blame] | 1285 | if (ch->scan_type.repeat > 1) |
| 1286 | length = ch->scan_type.storagebits / 8 * |
| 1287 | ch->scan_type.repeat; |
| 1288 | else |
| 1289 | length = ch->scan_type.storagebits / 8; |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1290 | /* Make sure we are aligned */ |
Lars-Peter Clausen | 61072db | 2014-07-17 16:59:00 +0100 | [diff] [blame] | 1291 | in_loc = roundup(in_loc, length) + length; |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1292 | } |
| 1293 | ch = iio_find_channel_from_si(indio_dev, in_ind); |
Srinivas Pandruvada | 0ee8546 | 2014-04-29 00:51:00 +0100 | [diff] [blame] | 1294 | if (ch->scan_type.repeat > 1) |
| 1295 | length = ch->scan_type.storagebits / 8 * |
| 1296 | ch->scan_type.repeat; |
| 1297 | else |
| 1298 | length = ch->scan_type.storagebits / 8; |
Lars-Peter Clausen | 61072db | 2014-07-17 16:59:00 +0100 | [diff] [blame] | 1299 | out_loc = roundup(out_loc, length); |
| 1300 | in_loc = roundup(in_loc, length); |
Lars-Peter Clausen | cbe88bc | 2014-07-17 16:59:00 +0100 | [diff] [blame] | 1301 | ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length); |
| 1302 | if (ret) |
| 1303 | goto error_clear_mux_table; |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1304 | out_loc += length; |
| 1305 | in_loc += length; |
| 1306 | } |
| 1307 | /* Relies on scan_timestamp being last */ |
| 1308 | if (buffer->scan_timestamp) { |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1309 | ch = iio_find_channel_from_si(indio_dev, |
Jonathan Cameron | f126480 | 2012-04-21 10:09:34 +0100 | [diff] [blame] | 1310 | indio_dev->scan_index_timestamp); |
Srinivas Pandruvada | 0ee8546 | 2014-04-29 00:51:00 +0100 | [diff] [blame] | 1311 | if (ch->scan_type.repeat > 1) |
| 1312 | length = ch->scan_type.storagebits / 8 * |
| 1313 | ch->scan_type.repeat; |
| 1314 | else |
| 1315 | length = ch->scan_type.storagebits / 8; |
Lars-Peter Clausen | 61072db | 2014-07-17 16:59:00 +0100 | [diff] [blame] | 1316 | out_loc = roundup(out_loc, length); |
| 1317 | in_loc = roundup(in_loc, length); |
Lars-Peter Clausen | cbe88bc | 2014-07-17 16:59:00 +0100 | [diff] [blame] | 1318 | ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length); |
| 1319 | if (ret) |
| 1320 | goto error_clear_mux_table; |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1321 | out_loc += length; |
| 1322 | in_loc += length; |
| 1323 | } |
| 1324 | buffer->demux_bounce = kzalloc(out_loc, GFP_KERNEL); |
| 1325 | if (buffer->demux_bounce == NULL) { |
| 1326 | ret = -ENOMEM; |
| 1327 | goto error_clear_mux_table; |
| 1328 | } |
| 1329 | return 0; |
| 1330 | |
| 1331 | error_clear_mux_table: |
Jonathan Cameron | 842cd10 | 2012-04-21 10:09:45 +0100 | [diff] [blame] | 1332 | iio_buffer_demux_free(buffer); |
| 1333 | |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1334 | return ret; |
| 1335 | } |
Jonathan Cameron | 84b36ce | 2012-06-30 20:06:00 +0100 | [diff] [blame] | 1336 | |
| 1337 | int iio_update_demux(struct iio_dev *indio_dev) |
| 1338 | { |
| 1339 | struct iio_buffer *buffer; |
| 1340 | int ret; |
| 1341 | |
| 1342 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) { |
| 1343 | ret = iio_buffer_update_demux(indio_dev, buffer); |
| 1344 | if (ret < 0) |
| 1345 | goto error_clear_mux_table; |
| 1346 | } |
| 1347 | return 0; |
| 1348 | |
| 1349 | error_clear_mux_table: |
| 1350 | list_for_each_entry(buffer, &indio_dev->buffer_list, buffer_list) |
| 1351 | iio_buffer_demux_free(buffer); |
| 1352 | |
| 1353 | return ret; |
| 1354 | } |
Jonathan Cameron | 5ada4ea | 2011-12-05 21:37:14 +0000 | [diff] [blame] | 1355 | EXPORT_SYMBOL_GPL(iio_update_demux); |
Lars-Peter Clausen | 9e69c93 | 2013-10-04 12:06:00 +0100 | [diff] [blame] | 1356 | |
| 1357 | /** |
| 1358 | * iio_buffer_release() - Free a buffer's resources |
| 1359 | * @ref: Pointer to the kref embedded in the iio_buffer struct |
| 1360 | * |
| 1361 | * This function is called when the last reference to the buffer has been |
| 1362 | * dropped. It will typically free all resources allocated by the buffer. Do not |
| 1363 | * call this function manually, always use iio_buffer_put() when done using a |
| 1364 | * buffer. |
| 1365 | */ |
| 1366 | static void iio_buffer_release(struct kref *ref) |
| 1367 | { |
| 1368 | struct iio_buffer *buffer = container_of(ref, struct iio_buffer, ref); |
| 1369 | |
| 1370 | buffer->access->release(buffer); |
| 1371 | } |
| 1372 | |
| 1373 | /** |
| 1374 | * iio_buffer_get() - Grab a reference to the buffer |
| 1375 | * @buffer: The buffer to grab a reference for, may be NULL |
| 1376 | * |
| 1377 | * Returns the pointer to the buffer that was passed into the function. |
| 1378 | */ |
| 1379 | struct iio_buffer *iio_buffer_get(struct iio_buffer *buffer) |
| 1380 | { |
| 1381 | if (buffer) |
| 1382 | kref_get(&buffer->ref); |
| 1383 | |
| 1384 | return buffer; |
| 1385 | } |
| 1386 | EXPORT_SYMBOL_GPL(iio_buffer_get); |
| 1387 | |
| 1388 | /** |
| 1389 | * iio_buffer_put() - Release the reference to the buffer |
| 1390 | * @buffer: The buffer to release the reference for, may be NULL |
| 1391 | */ |
| 1392 | void iio_buffer_put(struct iio_buffer *buffer) |
| 1393 | { |
| 1394 | if (buffer) |
| 1395 | kref_put(&buffer->ref, iio_buffer_release); |
| 1396 | } |
| 1397 | EXPORT_SYMBOL_GPL(iio_buffer_put); |