Commit | Line | Data |
---|---|---|
847ec80b JC |
1 | /* The industrial I/O core |
2 | * | |
3 | * Copyright (c) 2008 Jonathan Cameron | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | * | |
9 | * Based on elements of hwmon and input subsystems. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/idr.h> | |
15 | #include <linux/kdev_t.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/fs.h> | |
847ec80b | 19 | #include <linux/poll.h> |
ffc18afa | 20 | #include <linux/sched.h> |
4439c935 | 21 | #include <linux/wait.h> |
847ec80b | 22 | #include <linux/cdev.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
8e7d9672 | 24 | #include <linux/anon_inodes.h> |
e553f182 | 25 | #include <linux/debugfs.h> |
847ec80b | 26 | #include "iio.h" |
df9c1c42 | 27 | #include "iio_core.h" |
6aea1c36 | 28 | #include "iio_core_trigger.h" |
9dd1cb30 | 29 | #include "sysfs.h" |
af5046af | 30 | #include "events.h" |
9dd1cb30 | 31 | |
47c24fdd | 32 | /* IDA to assign each registered device a unique id*/ |
b156cf70 | 33 | static DEFINE_IDA(iio_ida); |
847ec80b | 34 | |
f625cb97 | 35 | static dev_t iio_devt; |
847ec80b JC |
36 | |
37 | #define IIO_DEV_MAX 256 | |
5aaaeba8 | 38 | struct bus_type iio_bus_type = { |
847ec80b | 39 | .name = "iio", |
847ec80b | 40 | }; |
5aaaeba8 | 41 | EXPORT_SYMBOL(iio_bus_type); |
847ec80b | 42 | |
e553f182 MH |
43 | static struct dentry *iio_debugfs_dentry; |
44 | ||
1e8dfcc6 JC |
45 | static const char * const iio_data_type_name[] = { |
46 | [IIO_RAW] = "raw", | |
47 | [IIO_PROCESSED] = "input", | |
48 | }; | |
49 | ||
c6fc8062 JC |
50 | static const char * const iio_direction[] = { |
51 | [0] = "in", | |
52 | [1] = "out", | |
53 | }; | |
54 | ||
ade7ef7b | 55 | static const char * const iio_chan_type_name_spec[] = { |
c6fc8062 | 56 | [IIO_VOLTAGE] = "voltage", |
faf290e8 MH |
57 | [IIO_CURRENT] = "current", |
58 | [IIO_POWER] = "power", | |
9bff02f8 | 59 | [IIO_ACCEL] = "accel", |
41ea040c | 60 | [IIO_ANGL_VEL] = "anglvel", |
1d892719 | 61 | [IIO_MAGN] = "magn", |
9bff02f8 BF |
62 | [IIO_LIGHT] = "illuminance", |
63 | [IIO_INTENSITY] = "intensity", | |
f09f2c81 | 64 | [IIO_PROXIMITY] = "proximity", |
9bff02f8 | 65 | [IIO_TEMP] = "temp", |
1d892719 JC |
66 | [IIO_INCLI] = "incli", |
67 | [IIO_ROT] = "rot", | |
1d892719 | 68 | [IIO_ANGL] = "angl", |
9bff02f8 | 69 | [IIO_TIMESTAMP] = "timestamp", |
66dbe704 | 70 | [IIO_CAPACITANCE] = "capacitance", |
1d892719 JC |
71 | }; |
72 | ||
330c6c57 | 73 | static const char * const iio_modifier_names[] = { |
1d892719 JC |
74 | [IIO_MOD_X] = "x", |
75 | [IIO_MOD_Y] = "y", | |
76 | [IIO_MOD_Z] = "z", | |
330c6c57 JC |
77 | [IIO_MOD_LIGHT_BOTH] = "both", |
78 | [IIO_MOD_LIGHT_IR] = "ir", | |
1d892719 JC |
79 | }; |
80 | ||
81 | /* relies on pairs of these shared then separate */ | |
82 | static const char * const iio_chan_info_postfix[] = { | |
c8a9f805 JC |
83 | [IIO_CHAN_INFO_SCALE] = "scale", |
84 | [IIO_CHAN_INFO_OFFSET] = "offset", | |
85 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", | |
86 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", | |
87 | [IIO_CHAN_INFO_PEAK] = "peak_raw", | |
88 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", | |
89 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", | |
90 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", | |
df94aba8 JC |
91 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
92 | = "filter_low_pass_3db_frequency", | |
1d892719 JC |
93 | }; |
94 | ||
5fb21c82 JC |
95 | const struct iio_chan_spec |
96 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) | |
97 | { | |
98 | int i; | |
99 | ||
100 | for (i = 0; i < indio_dev->num_channels; i++) | |
101 | if (indio_dev->channels[i].scan_index == si) | |
102 | return &indio_dev->channels[i]; | |
103 | return NULL; | |
104 | } | |
105 | ||
847ec80b JC |
106 | /* This turns up an awful lot */ |
107 | ssize_t iio_read_const_attr(struct device *dev, | |
108 | struct device_attribute *attr, | |
109 | char *buf) | |
110 | { | |
111 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
112 | } | |
113 | EXPORT_SYMBOL(iio_read_const_attr); | |
114 | ||
847ec80b JC |
115 | static int __init iio_init(void) |
116 | { | |
117 | int ret; | |
118 | ||
5aaaeba8 JC |
119 | /* Register sysfs bus */ |
120 | ret = bus_register(&iio_bus_type); | |
847ec80b JC |
121 | if (ret < 0) { |
122 | printk(KERN_ERR | |
5aaaeba8 | 123 | "%s could not register bus type\n", |
847ec80b JC |
124 | __FILE__); |
125 | goto error_nothing; | |
126 | } | |
127 | ||
9aa1a167 JC |
128 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
129 | if (ret < 0) { | |
130 | printk(KERN_ERR "%s: failed to allocate char dev region\n", | |
131 | __FILE__); | |
5aaaeba8 | 132 | goto error_unregister_bus_type; |
9aa1a167 | 133 | } |
847ec80b | 134 | |
e553f182 MH |
135 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
136 | ||
847ec80b JC |
137 | return 0; |
138 | ||
5aaaeba8 JC |
139 | error_unregister_bus_type: |
140 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
141 | error_nothing: |
142 | return ret; | |
143 | } | |
144 | ||
145 | static void __exit iio_exit(void) | |
146 | { | |
9aa1a167 JC |
147 | if (iio_devt) |
148 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 149 | bus_unregister(&iio_bus_type); |
e553f182 MH |
150 | debugfs_remove(iio_debugfs_dentry); |
151 | } | |
152 | ||
153 | #if defined(CONFIG_DEBUG_FS) | |
154 | static int iio_debugfs_open(struct inode *inode, struct file *file) | |
155 | { | |
156 | if (inode->i_private) | |
157 | file->private_data = inode->i_private; | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, | |
163 | size_t count, loff_t *ppos) | |
164 | { | |
165 | struct iio_dev *indio_dev = file->private_data; | |
166 | char buf[20]; | |
167 | unsigned val = 0; | |
168 | ssize_t len; | |
169 | int ret; | |
170 | ||
171 | ret = indio_dev->info->debugfs_reg_access(indio_dev, | |
172 | indio_dev->cached_reg_addr, | |
173 | 0, &val); | |
174 | if (ret) | |
175 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); | |
176 | ||
177 | len = snprintf(buf, sizeof(buf), "0x%X\n", val); | |
178 | ||
179 | return simple_read_from_buffer(userbuf, count, ppos, buf, len); | |
180 | } | |
181 | ||
182 | static ssize_t iio_debugfs_write_reg(struct file *file, | |
183 | const char __user *userbuf, size_t count, loff_t *ppos) | |
184 | { | |
185 | struct iio_dev *indio_dev = file->private_data; | |
186 | unsigned reg, val; | |
187 | char buf[80]; | |
188 | int ret; | |
189 | ||
190 | count = min_t(size_t, count, (sizeof(buf)-1)); | |
191 | if (copy_from_user(buf, userbuf, count)) | |
192 | return -EFAULT; | |
193 | ||
194 | buf[count] = 0; | |
195 | ||
196 | ret = sscanf(buf, "%i %i", ®, &val); | |
197 | ||
198 | switch (ret) { | |
199 | case 1: | |
200 | indio_dev->cached_reg_addr = reg; | |
201 | break; | |
202 | case 2: | |
203 | indio_dev->cached_reg_addr = reg; | |
204 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, | |
205 | val, NULL); | |
206 | if (ret) { | |
207 | dev_err(indio_dev->dev.parent, "%s: write failed\n", | |
208 | __func__); | |
209 | return ret; | |
210 | } | |
211 | break; | |
212 | default: | |
213 | return -EINVAL; | |
214 | } | |
215 | ||
216 | return count; | |
217 | } | |
218 | ||
219 | static const struct file_operations iio_debugfs_reg_fops = { | |
220 | .open = iio_debugfs_open, | |
221 | .read = iio_debugfs_read_reg, | |
222 | .write = iio_debugfs_write_reg, | |
223 | }; | |
224 | ||
225 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
226 | { | |
227 | debugfs_remove_recursive(indio_dev->debugfs_dentry); | |
847ec80b JC |
228 | } |
229 | ||
5f420b42 LPC |
230 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
231 | struct device_attribute *attr, | |
232 | char *buf) | |
233 | { | |
234 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
235 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
236 | const struct iio_chan_spec_ext_info *ext_info; | |
237 | ||
238 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
239 | ||
240 | return ext_info->read(indio_dev, this_attr->c, buf); | |
241 | } | |
242 | ||
243 | static ssize_t iio_write_channel_ext_info(struct device *dev, | |
244 | struct device_attribute *attr, | |
245 | const char *buf, | |
246 | size_t len) | |
247 | { | |
248 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
249 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
250 | const struct iio_chan_spec_ext_info *ext_info; | |
251 | ||
252 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
253 | ||
254 | return ext_info->write(indio_dev, this_attr->c, buf, len); | |
255 | } | |
256 | ||
e553f182 MH |
257 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
258 | { | |
259 | struct dentry *d; | |
260 | ||
261 | if (indio_dev->info->debugfs_reg_access == NULL) | |
262 | return 0; | |
263 | ||
264 | if (IS_ERR(iio_debugfs_dentry)) | |
265 | return 0; | |
266 | ||
267 | indio_dev->debugfs_dentry = | |
268 | debugfs_create_dir(dev_name(&indio_dev->dev), | |
269 | iio_debugfs_dentry); | |
270 | if (IS_ERR(indio_dev->debugfs_dentry)) | |
271 | return PTR_ERR(indio_dev->debugfs_dentry); | |
272 | ||
273 | if (indio_dev->debugfs_dentry == NULL) { | |
274 | dev_warn(indio_dev->dev.parent, | |
275 | "Failed to create debugfs directory\n"); | |
276 | return -EFAULT; | |
277 | } | |
278 | ||
279 | d = debugfs_create_file("direct_reg_access", 0644, | |
280 | indio_dev->debugfs_dentry, | |
281 | indio_dev, &iio_debugfs_reg_fops); | |
282 | if (!d) { | |
283 | iio_device_unregister_debugfs(indio_dev); | |
284 | return -ENOMEM; | |
285 | } | |
286 | ||
287 | return 0; | |
288 | } | |
289 | #else | |
290 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) | |
291 | { | |
292 | return 0; | |
293 | } | |
294 | ||
295 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
296 | { | |
297 | } | |
298 | #endif /* CONFIG_DEBUG_FS */ | |
299 | ||
1d892719 JC |
300 | static ssize_t iio_read_channel_info(struct device *dev, |
301 | struct device_attribute *attr, | |
302 | char *buf) | |
847ec80b | 303 | { |
1d892719 JC |
304 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
305 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
306 | int val, val2; | |
6fe8135f JC |
307 | int ret = indio_dev->info->read_raw(indio_dev, this_attr->c, |
308 | &val, &val2, this_attr->address); | |
1d892719 JC |
309 | |
310 | if (ret < 0) | |
311 | return ret; | |
847ec80b | 312 | |
1d892719 JC |
313 | if (ret == IIO_VAL_INT) |
314 | return sprintf(buf, "%d\n", val); | |
315 | else if (ret == IIO_VAL_INT_PLUS_MICRO) { | |
316 | if (val2 < 0) | |
317 | return sprintf(buf, "-%d.%06u\n", val, -val2); | |
318 | else | |
319 | return sprintf(buf, "%d.%06u\n", val, val2); | |
71646e2c MH |
320 | } else if (ret == IIO_VAL_INT_PLUS_NANO) { |
321 | if (val2 < 0) | |
322 | return sprintf(buf, "-%d.%09u\n", val, -val2); | |
323 | else | |
324 | return sprintf(buf, "%d.%09u\n", val, val2); | |
1d892719 JC |
325 | } else |
326 | return 0; | |
327 | } | |
328 | ||
329 | static ssize_t iio_write_channel_info(struct device *dev, | |
330 | struct device_attribute *attr, | |
331 | const char *buf, | |
332 | size_t len) | |
333 | { | |
334 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
335 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
5c04af04 | 336 | int ret, integer = 0, fract = 0, fract_mult = 100000; |
1d892719 JC |
337 | bool integer_part = true, negative = false; |
338 | ||
339 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 340 | if (!indio_dev->info->write_raw) |
1d892719 | 341 | return -EINVAL; |
5c04af04 MH |
342 | |
343 | if (indio_dev->info->write_raw_get_fmt) | |
344 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, | |
345 | this_attr->c, this_attr->address)) { | |
346 | case IIO_VAL_INT_PLUS_MICRO: | |
347 | fract_mult = 100000; | |
348 | break; | |
349 | case IIO_VAL_INT_PLUS_NANO: | |
350 | fract_mult = 100000000; | |
351 | break; | |
352 | default: | |
353 | return -EINVAL; | |
354 | } | |
355 | ||
1d892719 JC |
356 | if (buf[0] == '-') { |
357 | negative = true; | |
358 | buf++; | |
359 | } | |
5c04af04 | 360 | |
1d892719 JC |
361 | while (*buf) { |
362 | if ('0' <= *buf && *buf <= '9') { | |
363 | if (integer_part) | |
364 | integer = integer*10 + *buf - '0'; | |
365 | else { | |
5c04af04 MH |
366 | fract += fract_mult*(*buf - '0'); |
367 | if (fract_mult == 1) | |
1d892719 | 368 | break; |
5c04af04 | 369 | fract_mult /= 10; |
1d892719 JC |
370 | } |
371 | } else if (*buf == '\n') { | |
372 | if (*(buf + 1) == '\0') | |
373 | break; | |
374 | else | |
375 | return -EINVAL; | |
376 | } else if (*buf == '.') { | |
377 | integer_part = false; | |
378 | } else { | |
379 | return -EINVAL; | |
380 | } | |
381 | buf++; | |
382 | } | |
383 | if (negative) { | |
384 | if (integer) | |
385 | integer = -integer; | |
386 | else | |
5c04af04 | 387 | fract = -fract; |
1d892719 JC |
388 | } |
389 | ||
6fe8135f | 390 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 391 | integer, fract, this_attr->address); |
1d892719 JC |
392 | if (ret) |
393 | return ret; | |
394 | ||
395 | return len; | |
396 | } | |
397 | ||
df9c1c42 | 398 | static |
1d892719 JC |
399 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
400 | const char *postfix, | |
401 | struct iio_chan_spec const *chan, | |
402 | ssize_t (*readfunc)(struct device *dev, | |
403 | struct device_attribute *attr, | |
404 | char *buf), | |
405 | ssize_t (*writefunc)(struct device *dev, | |
406 | struct device_attribute *attr, | |
407 | const char *buf, | |
408 | size_t len), | |
409 | bool generic) | |
410 | { | |
411 | int ret; | |
412 | char *name_format, *full_postfix; | |
413 | sysfs_attr_init(&dev_attr->attr); | |
1d892719 | 414 | |
ade7ef7b | 415 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
0403e0d6 | 416 | if (chan->modified && !generic) { |
ade7ef7b JC |
417 | if (chan->extend_name) |
418 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
419 | iio_modifier_names[chan | |
420 | ->channel2], | |
421 | chan->extend_name, | |
422 | postfix); | |
423 | else | |
424 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
425 | iio_modifier_names[chan | |
426 | ->channel2], | |
427 | postfix); | |
428 | } else { | |
429 | if (chan->extend_name == NULL) | |
430 | full_postfix = kstrdup(postfix, GFP_KERNEL); | |
431 | else | |
432 | full_postfix = kasprintf(GFP_KERNEL, | |
433 | "%s_%s", | |
434 | chan->extend_name, | |
435 | postfix); | |
436 | } | |
437 | if (full_postfix == NULL) { | |
438 | ret = -ENOMEM; | |
439 | goto error_ret; | |
440 | } | |
1d892719 | 441 | |
4abf6f8b | 442 | if (chan->differential) { /* Differential can not have modifier */ |
ade7ef7b JC |
443 | if (generic) |
444 | name_format | |
445 | = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", | |
446 | iio_direction[chan->output], | |
447 | iio_chan_type_name_spec[chan->type], | |
448 | iio_chan_type_name_spec[chan->type], | |
449 | full_postfix); | |
450 | else if (chan->indexed) | |
451 | name_format | |
452 | = kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s", | |
453 | iio_direction[chan->output], | |
454 | iio_chan_type_name_spec[chan->type], | |
455 | chan->channel, | |
456 | iio_chan_type_name_spec[chan->type], | |
457 | chan->channel2, | |
458 | full_postfix); | |
459 | else { | |
460 | WARN_ON("Differential channels must be indexed\n"); | |
461 | ret = -EINVAL; | |
462 | goto error_free_full_postfix; | |
463 | } | |
464 | } else { /* Single ended */ | |
465 | if (generic) | |
466 | name_format | |
467 | = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
468 | iio_direction[chan->output], | |
469 | iio_chan_type_name_spec[chan->type], | |
470 | full_postfix); | |
471 | else if (chan->indexed) | |
472 | name_format | |
473 | = kasprintf(GFP_KERNEL, "%s_%s%d_%s", | |
474 | iio_direction[chan->output], | |
475 | iio_chan_type_name_spec[chan->type], | |
476 | chan->channel, | |
477 | full_postfix); | |
478 | else | |
479 | name_format | |
480 | = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
481 | iio_direction[chan->output], | |
482 | iio_chan_type_name_spec[chan->type], | |
483 | full_postfix); | |
484 | } | |
1d892719 JC |
485 | if (name_format == NULL) { |
486 | ret = -ENOMEM; | |
487 | goto error_free_full_postfix; | |
488 | } | |
489 | dev_attr->attr.name = kasprintf(GFP_KERNEL, | |
490 | name_format, | |
491 | chan->channel, | |
492 | chan->channel2); | |
493 | if (dev_attr->attr.name == NULL) { | |
494 | ret = -ENOMEM; | |
495 | goto error_free_name_format; | |
496 | } | |
497 | ||
498 | if (readfunc) { | |
499 | dev_attr->attr.mode |= S_IRUGO; | |
500 | dev_attr->show = readfunc; | |
501 | } | |
502 | ||
503 | if (writefunc) { | |
504 | dev_attr->attr.mode |= S_IWUSR; | |
505 | dev_attr->store = writefunc; | |
506 | } | |
507 | kfree(name_format); | |
508 | kfree(full_postfix); | |
509 | ||
510 | return 0; | |
511 | ||
512 | error_free_name_format: | |
513 | kfree(name_format); | |
514 | error_free_full_postfix: | |
515 | kfree(full_postfix); | |
516 | error_ret: | |
517 | return ret; | |
518 | } | |
519 | ||
df9c1c42 | 520 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
521 | { |
522 | kfree(dev_attr->attr.name); | |
523 | } | |
524 | ||
525 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
526 | struct iio_chan_spec const *chan, |
527 | ssize_t (*readfunc)(struct device *dev, | |
528 | struct device_attribute *attr, | |
529 | char *buf), | |
530 | ssize_t (*writefunc)(struct device *dev, | |
531 | struct device_attribute *attr, | |
532 | const char *buf, | |
533 | size_t len), | |
e614a54b | 534 | u64 mask, |
1d892719 JC |
535 | bool generic, |
536 | struct device *dev, | |
537 | struct list_head *attr_list) | |
538 | { | |
539 | int ret; | |
540 | struct iio_dev_attr *iio_attr, *t; | |
541 | ||
542 | iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL); | |
543 | if (iio_attr == NULL) { | |
544 | ret = -ENOMEM; | |
545 | goto error_ret; | |
546 | } | |
547 | ret = __iio_device_attr_init(&iio_attr->dev_attr, | |
548 | postfix, chan, | |
549 | readfunc, writefunc, generic); | |
550 | if (ret) | |
551 | goto error_iio_dev_attr_free; | |
552 | iio_attr->c = chan; | |
553 | iio_attr->address = mask; | |
554 | list_for_each_entry(t, attr_list, l) | |
555 | if (strcmp(t->dev_attr.attr.name, | |
556 | iio_attr->dev_attr.attr.name) == 0) { | |
557 | if (!generic) | |
558 | dev_err(dev, "tried to double register : %s\n", | |
559 | t->dev_attr.attr.name); | |
560 | ret = -EBUSY; | |
561 | goto error_device_attr_deinit; | |
562 | } | |
1d892719 JC |
563 | list_add(&iio_attr->l, attr_list); |
564 | ||
565 | return 0; | |
566 | ||
567 | error_device_attr_deinit: | |
568 | __iio_device_attr_deinit(&iio_attr->dev_attr); | |
569 | error_iio_dev_attr_free: | |
570 | kfree(iio_attr); | |
571 | error_ret: | |
572 | return ret; | |
573 | } | |
574 | ||
f8c6f4e9 | 575 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, |
1d892719 JC |
576 | struct iio_chan_spec const *chan) |
577 | { | |
26d25ae3 | 578 | int ret, i, attrcount = 0; |
5f420b42 | 579 | const struct iio_chan_spec_ext_info *ext_info; |
1d892719 | 580 | |
1d892719 JC |
581 | if (chan->channel < 0) |
582 | return 0; | |
1e8dfcc6 JC |
583 | |
584 | ret = __iio_add_chan_devattr(iio_data_type_name[chan->processed_val], | |
26d25ae3 | 585 | chan, |
1e8dfcc6 | 586 | &iio_read_channel_info, |
c6fc8062 | 587 | (chan->output ? |
1e8dfcc6 JC |
588 | &iio_write_channel_info : NULL), |
589 | 0, | |
590 | 0, | |
f8c6f4e9 JC |
591 | &indio_dev->dev, |
592 | &indio_dev->channel_attr_list); | |
1d892719 JC |
593 | if (ret) |
594 | goto error_ret; | |
26d25ae3 | 595 | attrcount++; |
1d892719 JC |
596 | |
597 | for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) { | |
598 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2], | |
26d25ae3 | 599 | chan, |
1d892719 JC |
600 | &iio_read_channel_info, |
601 | &iio_write_channel_info, | |
c8a9f805 | 602 | i/2, |
1d892719 | 603 | !(i%2), |
f8c6f4e9 JC |
604 | &indio_dev->dev, |
605 | &indio_dev->channel_attr_list); | |
1d892719 JC |
606 | if (ret == -EBUSY && (i%2 == 0)) { |
607 | ret = 0; | |
608 | continue; | |
609 | } | |
610 | if (ret < 0) | |
611 | goto error_ret; | |
26d25ae3 | 612 | attrcount++; |
1d892719 | 613 | } |
5f420b42 LPC |
614 | |
615 | if (chan->ext_info) { | |
616 | unsigned int i = 0; | |
617 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { | |
618 | ret = __iio_add_chan_devattr(ext_info->name, | |
619 | chan, | |
620 | ext_info->read ? | |
621 | &iio_read_channel_ext_info : NULL, | |
622 | ext_info->write ? | |
623 | &iio_write_channel_ext_info : NULL, | |
624 | i, | |
625 | ext_info->shared, | |
626 | &indio_dev->dev, | |
627 | &indio_dev->channel_attr_list); | |
628 | i++; | |
629 | if (ret == -EBUSY && ext_info->shared) | |
630 | continue; | |
631 | ||
632 | if (ret) | |
633 | goto error_ret; | |
634 | ||
635 | attrcount++; | |
636 | } | |
637 | } | |
638 | ||
26d25ae3 | 639 | ret = attrcount; |
1d892719 JC |
640 | error_ret: |
641 | return ret; | |
642 | } | |
643 | ||
f8c6f4e9 | 644 | static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev, |
1d892719 JC |
645 | struct iio_dev_attr *p) |
646 | { | |
1d892719 JC |
647 | kfree(p->dev_attr.attr.name); |
648 | kfree(p); | |
649 | } | |
650 | ||
1b732888 JC |
651 | static ssize_t iio_show_dev_name(struct device *dev, |
652 | struct device_attribute *attr, | |
653 | char *buf) | |
654 | { | |
655 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
656 | return sprintf(buf, "%s\n", indio_dev->name); | |
657 | } | |
658 | ||
659 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
660 | ||
f8c6f4e9 | 661 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 662 | { |
26d25ae3 | 663 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
1d892719 | 664 | struct iio_dev_attr *p, *n; |
26d25ae3 | 665 | struct attribute **attr; |
1d892719 | 666 | |
26d25ae3 | 667 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
668 | if (indio_dev->info->attrs) { |
669 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
670 | while (*attr++ != NULL) |
671 | attrcount_orig++; | |
847ec80b | 672 | } |
26d25ae3 | 673 | attrcount = attrcount_orig; |
1d892719 JC |
674 | /* |
675 | * New channel registration method - relies on the fact a group does | |
4abf6f8b | 676 | * not need to be initialized if it is name is NULL. |
1d892719 | 677 | */ |
f8c6f4e9 JC |
678 | INIT_LIST_HEAD(&indio_dev->channel_attr_list); |
679 | if (indio_dev->channels) | |
680 | for (i = 0; i < indio_dev->num_channels; i++) { | |
681 | ret = iio_device_add_channel_sysfs(indio_dev, | |
682 | &indio_dev | |
1d892719 JC |
683 | ->channels[i]); |
684 | if (ret < 0) | |
685 | goto error_clear_attrs; | |
26d25ae3 | 686 | attrcount += ret; |
1d892719 | 687 | } |
26d25ae3 | 688 | |
f8c6f4e9 | 689 | if (indio_dev->name) |
26d25ae3 JC |
690 | attrcount++; |
691 | ||
d83fb184 TM |
692 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
693 | sizeof(indio_dev->chan_attr_group.attrs[0]), | |
694 | GFP_KERNEL); | |
f8c6f4e9 | 695 | if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3 JC |
696 | ret = -ENOMEM; |
697 | goto error_clear_attrs; | |
1b732888 | 698 | } |
26d25ae3 | 699 | /* Copy across original attributes */ |
f8c6f4e9 JC |
700 | if (indio_dev->info->attrs) |
701 | memcpy(indio_dev->chan_attr_group.attrs, | |
702 | indio_dev->info->attrs->attrs, | |
703 | sizeof(indio_dev->chan_attr_group.attrs[0]) | |
26d25ae3 JC |
704 | *attrcount_orig); |
705 | attrn = attrcount_orig; | |
706 | /* Add all elements from the list. */ | |
f8c6f4e9 JC |
707 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
708 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; | |
709 | if (indio_dev->name) | |
710 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; | |
26d25ae3 | 711 | |
f8c6f4e9 JC |
712 | indio_dev->groups[indio_dev->groupcounter++] = |
713 | &indio_dev->chan_attr_group; | |
26d25ae3 | 714 | |
1d892719 | 715 | return 0; |
1b732888 | 716 | |
1d892719 JC |
717 | error_clear_attrs: |
718 | list_for_each_entry_safe(p, n, | |
f8c6f4e9 | 719 | &indio_dev->channel_attr_list, l) { |
1d892719 | 720 | list_del(&p->l); |
f8c6f4e9 | 721 | iio_device_remove_and_free_read_attr(indio_dev, p); |
1d892719 | 722 | } |
1d892719 | 723 | |
26d25ae3 | 724 | return ret; |
847ec80b JC |
725 | } |
726 | ||
f8c6f4e9 | 727 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 728 | { |
1d892719 JC |
729 | |
730 | struct iio_dev_attr *p, *n; | |
26d25ae3 | 731 | |
f8c6f4e9 | 732 | list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) { |
1d892719 | 733 | list_del(&p->l); |
f8c6f4e9 | 734 | iio_device_remove_and_free_read_attr(indio_dev, p); |
1d892719 | 735 | } |
f8c6f4e9 | 736 | kfree(indio_dev->chan_attr_group.attrs); |
847ec80b JC |
737 | } |
738 | ||
847ec80b JC |
739 | static void iio_dev_release(struct device *device) |
740 | { | |
f8c6f4e9 JC |
741 | struct iio_dev *indio_dev = container_of(device, struct iio_dev, dev); |
742 | cdev_del(&indio_dev->chrdev); | |
743 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) | |
744 | iio_device_unregister_trigger_consumer(indio_dev); | |
745 | iio_device_unregister_eventset(indio_dev); | |
746 | iio_device_unregister_sysfs(indio_dev); | |
e553f182 | 747 | iio_device_unregister_debugfs(indio_dev); |
847ec80b JC |
748 | } |
749 | ||
750 | static struct device_type iio_dev_type = { | |
751 | .name = "iio_device", | |
752 | .release = iio_dev_release, | |
753 | }; | |
754 | ||
6f7c8ee5 | 755 | struct iio_dev *iio_allocate_device(int sizeof_priv) |
847ec80b | 756 | { |
6f7c8ee5 JC |
757 | struct iio_dev *dev; |
758 | size_t alloc_size; | |
759 | ||
760 | alloc_size = sizeof(struct iio_dev); | |
761 | if (sizeof_priv) { | |
762 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); | |
763 | alloc_size += sizeof_priv; | |
764 | } | |
765 | /* ensure 32-byte alignment of whole construct ? */ | |
766 | alloc_size += IIO_ALIGN - 1; | |
767 | ||
768 | dev = kzalloc(alloc_size, GFP_KERNEL); | |
847ec80b JC |
769 | |
770 | if (dev) { | |
26d25ae3 | 771 | dev->dev.groups = dev->groups; |
847ec80b | 772 | dev->dev.type = &iio_dev_type; |
5aaaeba8 | 773 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
774 | device_initialize(&dev->dev); |
775 | dev_set_drvdata(&dev->dev, (void *)dev); | |
776 | mutex_init(&dev->mlock); | |
ac917a81 | 777 | mutex_init(&dev->info_exist_lock); |
a9e39f9e JC |
778 | |
779 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); | |
780 | if (dev->id < 0) { | |
781 | /* cannot use a dev_err as the name isn't available */ | |
782 | printk(KERN_ERR "Failed to get id\n"); | |
783 | kfree(dev); | |
784 | return NULL; | |
785 | } | |
786 | dev_set_name(&dev->dev, "iio:device%d", dev->id); | |
847ec80b JC |
787 | } |
788 | ||
789 | return dev; | |
790 | } | |
791 | EXPORT_SYMBOL(iio_allocate_device); | |
792 | ||
793 | void iio_free_device(struct iio_dev *dev) | |
794 | { | |
a9e39f9e JC |
795 | if (dev) { |
796 | ida_simple_remove(&iio_ida, dev->id); | |
1aa04278 | 797 | kfree(dev); |
a9e39f9e | 798 | } |
847ec80b JC |
799 | } |
800 | EXPORT_SYMBOL(iio_free_device); | |
801 | ||
1aa04278 | 802 | /** |
14555b14 | 803 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
1aa04278 JC |
804 | **/ |
805 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
806 | { | |
f8c6f4e9 | 807 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 808 | struct iio_dev, chrdev); |
bb01443e LPC |
809 | |
810 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
811 | return -EBUSY; | |
812 | ||
f8c6f4e9 | 813 | filp->private_data = indio_dev; |
30eb82f0 | 814 | |
79335140 | 815 | return 0; |
1aa04278 JC |
816 | } |
817 | ||
818 | /** | |
14555b14 | 819 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
1aa04278 JC |
820 | **/ |
821 | static int iio_chrdev_release(struct inode *inode, struct file *filp) | |
822 | { | |
bb01443e LPC |
823 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
824 | struct iio_dev, chrdev); | |
bb01443e | 825 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
1aa04278 JC |
826 | return 0; |
827 | } | |
828 | ||
829 | /* Somewhat of a cross file organization violation - ioctls here are actually | |
830 | * event related */ | |
831 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
832 | { | |
833 | struct iio_dev *indio_dev = filp->private_data; | |
834 | int __user *ip = (int __user *)arg; | |
835 | int fd; | |
836 | ||
837 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { | |
838 | fd = iio_event_getfd(indio_dev); | |
839 | if (copy_to_user(ip, &fd, sizeof(fd))) | |
840 | return -EFAULT; | |
841 | return 0; | |
842 | } | |
843 | return -EINVAL; | |
844 | } | |
845 | ||
14555b14 JC |
846 | static const struct file_operations iio_buffer_fileops = { |
847 | .read = iio_buffer_read_first_n_outer_addr, | |
1aa04278 JC |
848 | .release = iio_chrdev_release, |
849 | .open = iio_chrdev_open, | |
14555b14 | 850 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
851 | .owner = THIS_MODULE, |
852 | .llseek = noop_llseek, | |
853 | .unlocked_ioctl = iio_ioctl, | |
854 | .compat_ioctl = iio_ioctl, | |
855 | }; | |
856 | ||
0f1acee5 MH |
857 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
858 | ||
f8c6f4e9 | 859 | int iio_device_register(struct iio_dev *indio_dev) |
847ec80b JC |
860 | { |
861 | int ret; | |
862 | ||
1aa04278 | 863 | /* configure elements for the chrdev */ |
f8c6f4e9 | 864 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 865 | |
e553f182 MH |
866 | ret = iio_device_register_debugfs(indio_dev); |
867 | if (ret) { | |
868 | dev_err(indio_dev->dev.parent, | |
869 | "Failed to register debugfs interfaces\n"); | |
870 | goto error_ret; | |
871 | } | |
f8c6f4e9 | 872 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 873 | if (ret) { |
f8c6f4e9 | 874 | dev_err(indio_dev->dev.parent, |
847ec80b | 875 | "Failed to register sysfs interfaces\n"); |
e553f182 | 876 | goto error_unreg_debugfs; |
847ec80b | 877 | } |
f8c6f4e9 | 878 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 879 | if (ret) { |
f8c6f4e9 | 880 | dev_err(indio_dev->dev.parent, |
c849d253 | 881 | "Failed to register event set\n"); |
847ec80b JC |
882 | goto error_free_sysfs; |
883 | } | |
f8c6f4e9 JC |
884 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
885 | iio_device_register_trigger_consumer(indio_dev); | |
847ec80b | 886 | |
0f1acee5 MH |
887 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
888 | indio_dev->setup_ops == NULL) | |
889 | indio_dev->setup_ops = &noop_ring_setup_ops; | |
890 | ||
f8c6f4e9 | 891 | ret = device_add(&indio_dev->dev); |
26d25ae3 JC |
892 | if (ret < 0) |
893 | goto error_unreg_eventset; | |
f8c6f4e9 JC |
894 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
895 | indio_dev->chrdev.owner = indio_dev->info->driver_module; | |
896 | ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); | |
26d25ae3 JC |
897 | if (ret < 0) |
898 | goto error_del_device; | |
847ec80b JC |
899 | return 0; |
900 | ||
847ec80b | 901 | error_del_device: |
f8c6f4e9 | 902 | device_del(&indio_dev->dev); |
26d25ae3 | 903 | error_unreg_eventset: |
f8c6f4e9 | 904 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 905 | error_free_sysfs: |
f8c6f4e9 | 906 | iio_device_unregister_sysfs(indio_dev); |
e553f182 MH |
907 | error_unreg_debugfs: |
908 | iio_device_unregister_debugfs(indio_dev); | |
847ec80b JC |
909 | error_ret: |
910 | return ret; | |
911 | } | |
912 | EXPORT_SYMBOL(iio_device_register); | |
913 | ||
f8c6f4e9 | 914 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 915 | { |
ac917a81 JC |
916 | mutex_lock(&indio_dev->info_exist_lock); |
917 | indio_dev->info = NULL; | |
918 | mutex_unlock(&indio_dev->info_exist_lock); | |
f8c6f4e9 | 919 | device_unregister(&indio_dev->dev); |
847ec80b JC |
920 | } |
921 | EXPORT_SYMBOL(iio_device_unregister); | |
847ec80b JC |
922 | subsys_initcall(iio_init); |
923 | module_exit(iio_exit); | |
924 | ||
925 | MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>"); | |
926 | MODULE_DESCRIPTION("Industrial I/O core"); | |
927 | MODULE_LICENSE("GPL"); |