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> |
06458e27 | 26 | #include <linux/iio/iio.h> |
df9c1c42 | 27 | #include "iio_core.h" |
6aea1c36 | 28 | #include "iio_core_trigger.h" |
06458e27 JC |
29 | #include <linux/iio/sysfs.h> |
30 | #include <linux/iio/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 | ||
c6fc8062 JC |
45 | static const char * const iio_direction[] = { |
46 | [0] = "in", | |
47 | [1] = "out", | |
48 | }; | |
49 | ||
ade7ef7b | 50 | static const char * const iio_chan_type_name_spec[] = { |
c6fc8062 | 51 | [IIO_VOLTAGE] = "voltage", |
faf290e8 MH |
52 | [IIO_CURRENT] = "current", |
53 | [IIO_POWER] = "power", | |
9bff02f8 | 54 | [IIO_ACCEL] = "accel", |
41ea040c | 55 | [IIO_ANGL_VEL] = "anglvel", |
1d892719 | 56 | [IIO_MAGN] = "magn", |
9bff02f8 BF |
57 | [IIO_LIGHT] = "illuminance", |
58 | [IIO_INTENSITY] = "intensity", | |
f09f2c81 | 59 | [IIO_PROXIMITY] = "proximity", |
9bff02f8 | 60 | [IIO_TEMP] = "temp", |
1d892719 JC |
61 | [IIO_INCLI] = "incli", |
62 | [IIO_ROT] = "rot", | |
1d892719 | 63 | [IIO_ANGL] = "angl", |
9bff02f8 | 64 | [IIO_TIMESTAMP] = "timestamp", |
66dbe704 | 65 | [IIO_CAPACITANCE] = "capacitance", |
a6b12855 | 66 | [IIO_ALTVOLTAGE] = "altvoltage", |
1d892719 JC |
67 | }; |
68 | ||
330c6c57 | 69 | static const char * const iio_modifier_names[] = { |
1d892719 JC |
70 | [IIO_MOD_X] = "x", |
71 | [IIO_MOD_Y] = "y", | |
72 | [IIO_MOD_Z] = "z", | |
330c6c57 JC |
73 | [IIO_MOD_LIGHT_BOTH] = "both", |
74 | [IIO_MOD_LIGHT_IR] = "ir", | |
1d892719 JC |
75 | }; |
76 | ||
77 | /* relies on pairs of these shared then separate */ | |
78 | static const char * const iio_chan_info_postfix[] = { | |
75a973c7 JC |
79 | [IIO_CHAN_INFO_RAW] = "raw", |
80 | [IIO_CHAN_INFO_PROCESSED] = "input", | |
c8a9f805 JC |
81 | [IIO_CHAN_INFO_SCALE] = "scale", |
82 | [IIO_CHAN_INFO_OFFSET] = "offset", | |
83 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", | |
84 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", | |
85 | [IIO_CHAN_INFO_PEAK] = "peak_raw", | |
86 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", | |
87 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", | |
88 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", | |
df94aba8 JC |
89 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
90 | = "filter_low_pass_3db_frequency", | |
ce85a1cb | 91 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", |
a6b12855 MH |
92 | [IIO_CHAN_INFO_FREQUENCY] = "frequency", |
93 | [IIO_CHAN_INFO_PHASE] = "phase", | |
1d892719 JC |
94 | }; |
95 | ||
5fb21c82 JC |
96 | const struct iio_chan_spec |
97 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) | |
98 | { | |
99 | int i; | |
100 | ||
101 | for (i = 0; i < indio_dev->num_channels; i++) | |
102 | if (indio_dev->channels[i].scan_index == si) | |
103 | return &indio_dev->channels[i]; | |
104 | return NULL; | |
105 | } | |
106 | ||
847ec80b JC |
107 | /* This turns up an awful lot */ |
108 | ssize_t iio_read_const_attr(struct device *dev, | |
109 | struct device_attribute *attr, | |
110 | char *buf) | |
111 | { | |
112 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
113 | } | |
114 | EXPORT_SYMBOL(iio_read_const_attr); | |
115 | ||
847ec80b JC |
116 | static int __init iio_init(void) |
117 | { | |
118 | int ret; | |
119 | ||
5aaaeba8 JC |
120 | /* Register sysfs bus */ |
121 | ret = bus_register(&iio_bus_type); | |
847ec80b JC |
122 | if (ret < 0) { |
123 | printk(KERN_ERR | |
5aaaeba8 | 124 | "%s could not register bus type\n", |
847ec80b JC |
125 | __FILE__); |
126 | goto error_nothing; | |
127 | } | |
128 | ||
9aa1a167 JC |
129 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
130 | if (ret < 0) { | |
131 | printk(KERN_ERR "%s: failed to allocate char dev region\n", | |
132 | __FILE__); | |
5aaaeba8 | 133 | goto error_unregister_bus_type; |
9aa1a167 | 134 | } |
847ec80b | 135 | |
e553f182 MH |
136 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
137 | ||
847ec80b JC |
138 | return 0; |
139 | ||
5aaaeba8 JC |
140 | error_unregister_bus_type: |
141 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
142 | error_nothing: |
143 | return ret; | |
144 | } | |
145 | ||
146 | static void __exit iio_exit(void) | |
147 | { | |
9aa1a167 JC |
148 | if (iio_devt) |
149 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 150 | bus_unregister(&iio_bus_type); |
e553f182 MH |
151 | debugfs_remove(iio_debugfs_dentry); |
152 | } | |
153 | ||
154 | #if defined(CONFIG_DEBUG_FS) | |
155 | static int iio_debugfs_open(struct inode *inode, struct file *file) | |
156 | { | |
157 | if (inode->i_private) | |
158 | file->private_data = inode->i_private; | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, | |
164 | size_t count, loff_t *ppos) | |
165 | { | |
166 | struct iio_dev *indio_dev = file->private_data; | |
167 | char buf[20]; | |
168 | unsigned val = 0; | |
169 | ssize_t len; | |
170 | int ret; | |
171 | ||
172 | ret = indio_dev->info->debugfs_reg_access(indio_dev, | |
173 | indio_dev->cached_reg_addr, | |
174 | 0, &val); | |
175 | if (ret) | |
176 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); | |
177 | ||
178 | len = snprintf(buf, sizeof(buf), "0x%X\n", val); | |
179 | ||
180 | return simple_read_from_buffer(userbuf, count, ppos, buf, len); | |
181 | } | |
182 | ||
183 | static ssize_t iio_debugfs_write_reg(struct file *file, | |
184 | const char __user *userbuf, size_t count, loff_t *ppos) | |
185 | { | |
186 | struct iio_dev *indio_dev = file->private_data; | |
187 | unsigned reg, val; | |
188 | char buf[80]; | |
189 | int ret; | |
190 | ||
191 | count = min_t(size_t, count, (sizeof(buf)-1)); | |
192 | if (copy_from_user(buf, userbuf, count)) | |
193 | return -EFAULT; | |
194 | ||
195 | buf[count] = 0; | |
196 | ||
197 | ret = sscanf(buf, "%i %i", ®, &val); | |
198 | ||
199 | switch (ret) { | |
200 | case 1: | |
201 | indio_dev->cached_reg_addr = reg; | |
202 | break; | |
203 | case 2: | |
204 | indio_dev->cached_reg_addr = reg; | |
205 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, | |
206 | val, NULL); | |
207 | if (ret) { | |
208 | dev_err(indio_dev->dev.parent, "%s: write failed\n", | |
209 | __func__); | |
210 | return ret; | |
211 | } | |
212 | break; | |
213 | default: | |
214 | return -EINVAL; | |
215 | } | |
216 | ||
217 | return count; | |
218 | } | |
219 | ||
220 | static const struct file_operations iio_debugfs_reg_fops = { | |
221 | .open = iio_debugfs_open, | |
222 | .read = iio_debugfs_read_reg, | |
223 | .write = iio_debugfs_write_reg, | |
224 | }; | |
225 | ||
226 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
227 | { | |
228 | debugfs_remove_recursive(indio_dev->debugfs_dentry); | |
847ec80b JC |
229 | } |
230 | ||
e553f182 MH |
231 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
232 | { | |
233 | struct dentry *d; | |
234 | ||
235 | if (indio_dev->info->debugfs_reg_access == NULL) | |
236 | return 0; | |
237 | ||
238 | if (IS_ERR(iio_debugfs_dentry)) | |
239 | return 0; | |
240 | ||
241 | indio_dev->debugfs_dentry = | |
242 | debugfs_create_dir(dev_name(&indio_dev->dev), | |
243 | iio_debugfs_dentry); | |
244 | if (IS_ERR(indio_dev->debugfs_dentry)) | |
245 | return PTR_ERR(indio_dev->debugfs_dentry); | |
246 | ||
247 | if (indio_dev->debugfs_dentry == NULL) { | |
248 | dev_warn(indio_dev->dev.parent, | |
249 | "Failed to create debugfs directory\n"); | |
250 | return -EFAULT; | |
251 | } | |
252 | ||
253 | d = debugfs_create_file("direct_reg_access", 0644, | |
254 | indio_dev->debugfs_dentry, | |
255 | indio_dev, &iio_debugfs_reg_fops); | |
256 | if (!d) { | |
257 | iio_device_unregister_debugfs(indio_dev); | |
258 | return -ENOMEM; | |
259 | } | |
260 | ||
261 | return 0; | |
262 | } | |
263 | #else | |
264 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) | |
265 | { | |
266 | return 0; | |
267 | } | |
268 | ||
269 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
270 | { | |
271 | } | |
272 | #endif /* CONFIG_DEBUG_FS */ | |
273 | ||
4fee7e16 LPC |
274 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
275 | struct device_attribute *attr, | |
276 | char *buf) | |
277 | { | |
278 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
279 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
280 | const struct iio_chan_spec_ext_info *ext_info; | |
281 | ||
282 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
283 | ||
284 | return ext_info->read(indio_dev, this_attr->c, buf); | |
285 | } | |
286 | ||
287 | static ssize_t iio_write_channel_ext_info(struct device *dev, | |
288 | struct device_attribute *attr, | |
289 | const char *buf, | |
290 | size_t len) | |
291 | { | |
292 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
293 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
294 | const struct iio_chan_spec_ext_info *ext_info; | |
295 | ||
296 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
297 | ||
298 | return ext_info->write(indio_dev, this_attr->c, buf, len); | |
299 | } | |
300 | ||
1d892719 JC |
301 | static ssize_t iio_read_channel_info(struct device *dev, |
302 | struct device_attribute *attr, | |
303 | char *buf) | |
847ec80b | 304 | { |
1d892719 JC |
305 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
306 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
307 | int val, val2; | |
6fe8135f JC |
308 | int ret = indio_dev->info->read_raw(indio_dev, this_attr->c, |
309 | &val, &val2, this_attr->address); | |
1d892719 JC |
310 | |
311 | if (ret < 0) | |
312 | return ret; | |
847ec80b | 313 | |
1d892719 JC |
314 | if (ret == IIO_VAL_INT) |
315 | return sprintf(buf, "%d\n", val); | |
316 | else if (ret == IIO_VAL_INT_PLUS_MICRO) { | |
317 | if (val2 < 0) | |
318 | return sprintf(buf, "-%d.%06u\n", val, -val2); | |
319 | else | |
320 | return sprintf(buf, "%d.%06u\n", val, val2); | |
71646e2c MH |
321 | } else if (ret == IIO_VAL_INT_PLUS_NANO) { |
322 | if (val2 < 0) | |
323 | return sprintf(buf, "-%d.%09u\n", val, -val2); | |
324 | else | |
325 | return sprintf(buf, "%d.%09u\n", val, val2); | |
1d892719 JC |
326 | } else |
327 | return 0; | |
328 | } | |
329 | ||
330 | static ssize_t iio_write_channel_info(struct device *dev, | |
331 | struct device_attribute *attr, | |
332 | const char *buf, | |
333 | size_t len) | |
334 | { | |
335 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
336 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
5c04af04 | 337 | int ret, integer = 0, fract = 0, fract_mult = 100000; |
1d892719 JC |
338 | bool integer_part = true, negative = false; |
339 | ||
340 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 341 | if (!indio_dev->info->write_raw) |
1d892719 | 342 | return -EINVAL; |
5c04af04 MH |
343 | |
344 | if (indio_dev->info->write_raw_get_fmt) | |
345 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, | |
346 | this_attr->c, this_attr->address)) { | |
347 | case IIO_VAL_INT_PLUS_MICRO: | |
348 | fract_mult = 100000; | |
349 | break; | |
350 | case IIO_VAL_INT_PLUS_NANO: | |
351 | fract_mult = 100000000; | |
352 | break; | |
353 | default: | |
354 | return -EINVAL; | |
355 | } | |
356 | ||
1d892719 JC |
357 | if (buf[0] == '-') { |
358 | negative = true; | |
359 | buf++; | |
360 | } | |
5c04af04 | 361 | |
1d892719 JC |
362 | while (*buf) { |
363 | if ('0' <= *buf && *buf <= '9') { | |
364 | if (integer_part) | |
365 | integer = integer*10 + *buf - '0'; | |
366 | else { | |
5c04af04 MH |
367 | fract += fract_mult*(*buf - '0'); |
368 | if (fract_mult == 1) | |
1d892719 | 369 | break; |
5c04af04 | 370 | fract_mult /= 10; |
1d892719 JC |
371 | } |
372 | } else if (*buf == '\n') { | |
373 | if (*(buf + 1) == '\0') | |
374 | break; | |
375 | else | |
376 | return -EINVAL; | |
377 | } else if (*buf == '.') { | |
378 | integer_part = false; | |
379 | } else { | |
380 | return -EINVAL; | |
381 | } | |
382 | buf++; | |
383 | } | |
384 | if (negative) { | |
385 | if (integer) | |
386 | integer = -integer; | |
387 | else | |
5c04af04 | 388 | fract = -fract; |
1d892719 JC |
389 | } |
390 | ||
6fe8135f | 391 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 392 | integer, fract, this_attr->address); |
1d892719 JC |
393 | if (ret) |
394 | return ret; | |
395 | ||
396 | return len; | |
397 | } | |
398 | ||
df9c1c42 | 399 | static |
1d892719 JC |
400 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
401 | const char *postfix, | |
402 | struct iio_chan_spec const *chan, | |
403 | ssize_t (*readfunc)(struct device *dev, | |
404 | struct device_attribute *attr, | |
405 | char *buf), | |
406 | ssize_t (*writefunc)(struct device *dev, | |
407 | struct device_attribute *attr, | |
408 | const char *buf, | |
409 | size_t len), | |
410 | bool generic) | |
411 | { | |
412 | int ret; | |
413 | char *name_format, *full_postfix; | |
414 | sysfs_attr_init(&dev_attr->attr); | |
1d892719 | 415 | |
ade7ef7b | 416 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
0403e0d6 | 417 | if (chan->modified && !generic) { |
ade7ef7b JC |
418 | if (chan->extend_name) |
419 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
420 | iio_modifier_names[chan | |
421 | ->channel2], | |
422 | chan->extend_name, | |
423 | postfix); | |
424 | else | |
425 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
426 | iio_modifier_names[chan | |
427 | ->channel2], | |
428 | postfix); | |
429 | } else { | |
430 | if (chan->extend_name == NULL) | |
431 | full_postfix = kstrdup(postfix, GFP_KERNEL); | |
432 | else | |
433 | full_postfix = kasprintf(GFP_KERNEL, | |
434 | "%s_%s", | |
435 | chan->extend_name, | |
436 | postfix); | |
437 | } | |
438 | if (full_postfix == NULL) { | |
439 | ret = -ENOMEM; | |
440 | goto error_ret; | |
441 | } | |
1d892719 | 442 | |
4abf6f8b | 443 | if (chan->differential) { /* Differential can not have modifier */ |
ade7ef7b JC |
444 | if (generic) |
445 | name_format | |
446 | = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", | |
447 | iio_direction[chan->output], | |
448 | iio_chan_type_name_spec[chan->type], | |
449 | iio_chan_type_name_spec[chan->type], | |
450 | full_postfix); | |
451 | else if (chan->indexed) | |
452 | name_format | |
453 | = kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s", | |
454 | iio_direction[chan->output], | |
455 | iio_chan_type_name_spec[chan->type], | |
456 | chan->channel, | |
457 | iio_chan_type_name_spec[chan->type], | |
458 | chan->channel2, | |
459 | full_postfix); | |
460 | else { | |
461 | WARN_ON("Differential channels must be indexed\n"); | |
462 | ret = -EINVAL; | |
463 | goto error_free_full_postfix; | |
464 | } | |
465 | } else { /* Single ended */ | |
466 | if (generic) | |
467 | name_format | |
468 | = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
469 | iio_direction[chan->output], | |
470 | iio_chan_type_name_spec[chan->type], | |
471 | full_postfix); | |
472 | else if (chan->indexed) | |
473 | name_format | |
474 | = kasprintf(GFP_KERNEL, "%s_%s%d_%s", | |
475 | iio_direction[chan->output], | |
476 | iio_chan_type_name_spec[chan->type], | |
477 | chan->channel, | |
478 | full_postfix); | |
479 | else | |
480 | name_format | |
481 | = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
482 | iio_direction[chan->output], | |
483 | iio_chan_type_name_spec[chan->type], | |
484 | full_postfix); | |
485 | } | |
1d892719 JC |
486 | if (name_format == NULL) { |
487 | ret = -ENOMEM; | |
488 | goto error_free_full_postfix; | |
489 | } | |
490 | dev_attr->attr.name = kasprintf(GFP_KERNEL, | |
491 | name_format, | |
492 | chan->channel, | |
493 | chan->channel2); | |
494 | if (dev_attr->attr.name == NULL) { | |
495 | ret = -ENOMEM; | |
496 | goto error_free_name_format; | |
497 | } | |
498 | ||
499 | if (readfunc) { | |
500 | dev_attr->attr.mode |= S_IRUGO; | |
501 | dev_attr->show = readfunc; | |
502 | } | |
503 | ||
504 | if (writefunc) { | |
505 | dev_attr->attr.mode |= S_IWUSR; | |
506 | dev_attr->store = writefunc; | |
507 | } | |
508 | kfree(name_format); | |
509 | kfree(full_postfix); | |
510 | ||
511 | return 0; | |
512 | ||
513 | error_free_name_format: | |
514 | kfree(name_format); | |
515 | error_free_full_postfix: | |
516 | kfree(full_postfix); | |
517 | error_ret: | |
518 | return ret; | |
519 | } | |
520 | ||
df9c1c42 | 521 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
522 | { |
523 | kfree(dev_attr->attr.name); | |
524 | } | |
525 | ||
526 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
527 | struct iio_chan_spec const *chan, |
528 | ssize_t (*readfunc)(struct device *dev, | |
529 | struct device_attribute *attr, | |
530 | char *buf), | |
531 | ssize_t (*writefunc)(struct device *dev, | |
532 | struct device_attribute *attr, | |
533 | const char *buf, | |
534 | size_t len), | |
e614a54b | 535 | u64 mask, |
1d892719 JC |
536 | bool generic, |
537 | struct device *dev, | |
538 | struct list_head *attr_list) | |
539 | { | |
540 | int ret; | |
541 | struct iio_dev_attr *iio_attr, *t; | |
542 | ||
543 | iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL); | |
544 | if (iio_attr == NULL) { | |
545 | ret = -ENOMEM; | |
546 | goto error_ret; | |
547 | } | |
548 | ret = __iio_device_attr_init(&iio_attr->dev_attr, | |
549 | postfix, chan, | |
550 | readfunc, writefunc, generic); | |
551 | if (ret) | |
552 | goto error_iio_dev_attr_free; | |
553 | iio_attr->c = chan; | |
554 | iio_attr->address = mask; | |
555 | list_for_each_entry(t, attr_list, l) | |
556 | if (strcmp(t->dev_attr.attr.name, | |
557 | iio_attr->dev_attr.attr.name) == 0) { | |
558 | if (!generic) | |
559 | dev_err(dev, "tried to double register : %s\n", | |
560 | t->dev_attr.attr.name); | |
561 | ret = -EBUSY; | |
562 | goto error_device_attr_deinit; | |
563 | } | |
1d892719 JC |
564 | list_add(&iio_attr->l, attr_list); |
565 | ||
566 | return 0; | |
567 | ||
568 | error_device_attr_deinit: | |
569 | __iio_device_attr_deinit(&iio_attr->dev_attr); | |
570 | error_iio_dev_attr_free: | |
571 | kfree(iio_attr); | |
572 | error_ret: | |
573 | return ret; | |
574 | } | |
575 | ||
f8c6f4e9 | 576 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, |
1d892719 JC |
577 | struct iio_chan_spec const *chan) |
578 | { | |
5ccb3adb | 579 | int ret, attrcount = 0; |
75a973c7 | 580 | int i; |
5f420b42 | 581 | const struct iio_chan_spec_ext_info *ext_info; |
1d892719 | 582 | |
1d892719 JC |
583 | if (chan->channel < 0) |
584 | return 0; | |
75a973c7 | 585 | for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) { |
1d892719 | 586 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2], |
26d25ae3 | 587 | chan, |
1d892719 JC |
588 | &iio_read_channel_info, |
589 | &iio_write_channel_info, | |
c8a9f805 | 590 | i/2, |
1d892719 | 591 | !(i%2), |
f8c6f4e9 JC |
592 | &indio_dev->dev, |
593 | &indio_dev->channel_attr_list); | |
1d892719 JC |
594 | if (ret == -EBUSY && (i%2 == 0)) { |
595 | ret = 0; | |
596 | continue; | |
597 | } | |
598 | if (ret < 0) | |
599 | goto error_ret; | |
26d25ae3 | 600 | attrcount++; |
1d892719 | 601 | } |
5f420b42 LPC |
602 | |
603 | if (chan->ext_info) { | |
604 | unsigned int i = 0; | |
605 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { | |
606 | ret = __iio_add_chan_devattr(ext_info->name, | |
607 | chan, | |
608 | ext_info->read ? | |
609 | &iio_read_channel_ext_info : NULL, | |
610 | ext_info->write ? | |
611 | &iio_write_channel_ext_info : NULL, | |
612 | i, | |
613 | ext_info->shared, | |
614 | &indio_dev->dev, | |
615 | &indio_dev->channel_attr_list); | |
616 | i++; | |
617 | if (ret == -EBUSY && ext_info->shared) | |
618 | continue; | |
619 | ||
620 | if (ret) | |
621 | goto error_ret; | |
622 | ||
623 | attrcount++; | |
624 | } | |
625 | } | |
626 | ||
26d25ae3 | 627 | ret = attrcount; |
1d892719 JC |
628 | error_ret: |
629 | return ret; | |
630 | } | |
631 | ||
f8c6f4e9 | 632 | static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev, |
1d892719 JC |
633 | struct iio_dev_attr *p) |
634 | { | |
1d892719 JC |
635 | kfree(p->dev_attr.attr.name); |
636 | kfree(p); | |
637 | } | |
638 | ||
1b732888 JC |
639 | static ssize_t iio_show_dev_name(struct device *dev, |
640 | struct device_attribute *attr, | |
641 | char *buf) | |
642 | { | |
643 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
644 | return sprintf(buf, "%s\n", indio_dev->name); | |
645 | } | |
646 | ||
647 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
648 | ||
f8c6f4e9 | 649 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 650 | { |
26d25ae3 | 651 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
1d892719 | 652 | struct iio_dev_attr *p, *n; |
26d25ae3 | 653 | struct attribute **attr; |
1d892719 | 654 | |
26d25ae3 | 655 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
656 | if (indio_dev->info->attrs) { |
657 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
658 | while (*attr++ != NULL) |
659 | attrcount_orig++; | |
847ec80b | 660 | } |
26d25ae3 | 661 | attrcount = attrcount_orig; |
1d892719 JC |
662 | /* |
663 | * New channel registration method - relies on the fact a group does | |
4abf6f8b | 664 | * not need to be initialized if it is name is NULL. |
1d892719 | 665 | */ |
f8c6f4e9 JC |
666 | INIT_LIST_HEAD(&indio_dev->channel_attr_list); |
667 | if (indio_dev->channels) | |
668 | for (i = 0; i < indio_dev->num_channels; i++) { | |
669 | ret = iio_device_add_channel_sysfs(indio_dev, | |
670 | &indio_dev | |
1d892719 JC |
671 | ->channels[i]); |
672 | if (ret < 0) | |
673 | goto error_clear_attrs; | |
26d25ae3 | 674 | attrcount += ret; |
1d892719 | 675 | } |
26d25ae3 | 676 | |
f8c6f4e9 | 677 | if (indio_dev->name) |
26d25ae3 JC |
678 | attrcount++; |
679 | ||
d83fb184 TM |
680 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
681 | sizeof(indio_dev->chan_attr_group.attrs[0]), | |
682 | GFP_KERNEL); | |
f8c6f4e9 | 683 | if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3 JC |
684 | ret = -ENOMEM; |
685 | goto error_clear_attrs; | |
1b732888 | 686 | } |
26d25ae3 | 687 | /* Copy across original attributes */ |
f8c6f4e9 JC |
688 | if (indio_dev->info->attrs) |
689 | memcpy(indio_dev->chan_attr_group.attrs, | |
690 | indio_dev->info->attrs->attrs, | |
691 | sizeof(indio_dev->chan_attr_group.attrs[0]) | |
26d25ae3 JC |
692 | *attrcount_orig); |
693 | attrn = attrcount_orig; | |
694 | /* Add all elements from the list. */ | |
f8c6f4e9 JC |
695 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
696 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; | |
697 | if (indio_dev->name) | |
698 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; | |
26d25ae3 | 699 | |
f8c6f4e9 JC |
700 | indio_dev->groups[indio_dev->groupcounter++] = |
701 | &indio_dev->chan_attr_group; | |
26d25ae3 | 702 | |
1d892719 | 703 | return 0; |
1b732888 | 704 | |
1d892719 JC |
705 | error_clear_attrs: |
706 | list_for_each_entry_safe(p, n, | |
f8c6f4e9 | 707 | &indio_dev->channel_attr_list, l) { |
1d892719 | 708 | list_del(&p->l); |
f8c6f4e9 | 709 | iio_device_remove_and_free_read_attr(indio_dev, p); |
1d892719 | 710 | } |
1d892719 | 711 | |
26d25ae3 | 712 | return ret; |
847ec80b JC |
713 | } |
714 | ||
f8c6f4e9 | 715 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 716 | { |
1d892719 JC |
717 | |
718 | struct iio_dev_attr *p, *n; | |
26d25ae3 | 719 | |
f8c6f4e9 | 720 | list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) { |
1d892719 | 721 | list_del(&p->l); |
f8c6f4e9 | 722 | iio_device_remove_and_free_read_attr(indio_dev, p); |
1d892719 | 723 | } |
f8c6f4e9 | 724 | kfree(indio_dev->chan_attr_group.attrs); |
847ec80b JC |
725 | } |
726 | ||
847ec80b JC |
727 | static void iio_dev_release(struct device *device) |
728 | { | |
f8c6f4e9 JC |
729 | struct iio_dev *indio_dev = container_of(device, struct iio_dev, dev); |
730 | cdev_del(&indio_dev->chrdev); | |
731 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) | |
732 | iio_device_unregister_trigger_consumer(indio_dev); | |
733 | iio_device_unregister_eventset(indio_dev); | |
734 | iio_device_unregister_sysfs(indio_dev); | |
e553f182 | 735 | iio_device_unregister_debugfs(indio_dev); |
847ec80b JC |
736 | } |
737 | ||
738 | static struct device_type iio_dev_type = { | |
739 | .name = "iio_device", | |
740 | .release = iio_dev_release, | |
741 | }; | |
742 | ||
7cbb7537 | 743 | struct iio_dev *iio_device_alloc(int sizeof_priv) |
847ec80b | 744 | { |
6f7c8ee5 JC |
745 | struct iio_dev *dev; |
746 | size_t alloc_size; | |
747 | ||
748 | alloc_size = sizeof(struct iio_dev); | |
749 | if (sizeof_priv) { | |
750 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); | |
751 | alloc_size += sizeof_priv; | |
752 | } | |
753 | /* ensure 32-byte alignment of whole construct ? */ | |
754 | alloc_size += IIO_ALIGN - 1; | |
755 | ||
756 | dev = kzalloc(alloc_size, GFP_KERNEL); | |
847ec80b JC |
757 | |
758 | if (dev) { | |
26d25ae3 | 759 | dev->dev.groups = dev->groups; |
847ec80b | 760 | dev->dev.type = &iio_dev_type; |
5aaaeba8 | 761 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
762 | device_initialize(&dev->dev); |
763 | dev_set_drvdata(&dev->dev, (void *)dev); | |
764 | mutex_init(&dev->mlock); | |
ac917a81 | 765 | mutex_init(&dev->info_exist_lock); |
a9e39f9e JC |
766 | |
767 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); | |
768 | if (dev->id < 0) { | |
769 | /* cannot use a dev_err as the name isn't available */ | |
770 | printk(KERN_ERR "Failed to get id\n"); | |
771 | kfree(dev); | |
772 | return NULL; | |
773 | } | |
774 | dev_set_name(&dev->dev, "iio:device%d", dev->id); | |
847ec80b JC |
775 | } |
776 | ||
777 | return dev; | |
778 | } | |
7cbb7537 | 779 | EXPORT_SYMBOL(iio_device_alloc); |
847ec80b | 780 | |
7cbb7537 | 781 | void iio_device_free(struct iio_dev *dev) |
847ec80b | 782 | { |
a9e39f9e JC |
783 | if (dev) { |
784 | ida_simple_remove(&iio_ida, dev->id); | |
1aa04278 | 785 | kfree(dev); |
a9e39f9e | 786 | } |
847ec80b | 787 | } |
7cbb7537 | 788 | EXPORT_SYMBOL(iio_device_free); |
847ec80b | 789 | |
1aa04278 | 790 | /** |
14555b14 | 791 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
1aa04278 JC |
792 | **/ |
793 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
794 | { | |
f8c6f4e9 | 795 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 796 | struct iio_dev, chrdev); |
bb01443e LPC |
797 | |
798 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
799 | return -EBUSY; | |
800 | ||
f8c6f4e9 | 801 | filp->private_data = indio_dev; |
30eb82f0 | 802 | |
79335140 | 803 | return 0; |
1aa04278 JC |
804 | } |
805 | ||
806 | /** | |
14555b14 | 807 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
1aa04278 JC |
808 | **/ |
809 | static int iio_chrdev_release(struct inode *inode, struct file *filp) | |
810 | { | |
bb01443e LPC |
811 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
812 | struct iio_dev, chrdev); | |
bb01443e | 813 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
1aa04278 JC |
814 | return 0; |
815 | } | |
816 | ||
817 | /* Somewhat of a cross file organization violation - ioctls here are actually | |
818 | * event related */ | |
819 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
820 | { | |
821 | struct iio_dev *indio_dev = filp->private_data; | |
822 | int __user *ip = (int __user *)arg; | |
823 | int fd; | |
824 | ||
825 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { | |
826 | fd = iio_event_getfd(indio_dev); | |
827 | if (copy_to_user(ip, &fd, sizeof(fd))) | |
828 | return -EFAULT; | |
829 | return 0; | |
830 | } | |
831 | return -EINVAL; | |
832 | } | |
833 | ||
14555b14 JC |
834 | static const struct file_operations iio_buffer_fileops = { |
835 | .read = iio_buffer_read_first_n_outer_addr, | |
1aa04278 JC |
836 | .release = iio_chrdev_release, |
837 | .open = iio_chrdev_open, | |
14555b14 | 838 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
839 | .owner = THIS_MODULE, |
840 | .llseek = noop_llseek, | |
841 | .unlocked_ioctl = iio_ioctl, | |
842 | .compat_ioctl = iio_ioctl, | |
843 | }; | |
844 | ||
0f1acee5 MH |
845 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
846 | ||
f8c6f4e9 | 847 | int iio_device_register(struct iio_dev *indio_dev) |
847ec80b JC |
848 | { |
849 | int ret; | |
850 | ||
1aa04278 | 851 | /* configure elements for the chrdev */ |
f8c6f4e9 | 852 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 853 | |
e553f182 MH |
854 | ret = iio_device_register_debugfs(indio_dev); |
855 | if (ret) { | |
856 | dev_err(indio_dev->dev.parent, | |
857 | "Failed to register debugfs interfaces\n"); | |
858 | goto error_ret; | |
859 | } | |
f8c6f4e9 | 860 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 861 | if (ret) { |
f8c6f4e9 | 862 | dev_err(indio_dev->dev.parent, |
847ec80b | 863 | "Failed to register sysfs interfaces\n"); |
e553f182 | 864 | goto error_unreg_debugfs; |
847ec80b | 865 | } |
f8c6f4e9 | 866 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 867 | if (ret) { |
f8c6f4e9 | 868 | dev_err(indio_dev->dev.parent, |
c849d253 | 869 | "Failed to register event set\n"); |
847ec80b JC |
870 | goto error_free_sysfs; |
871 | } | |
f8c6f4e9 JC |
872 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
873 | iio_device_register_trigger_consumer(indio_dev); | |
847ec80b | 874 | |
0f1acee5 MH |
875 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
876 | indio_dev->setup_ops == NULL) | |
877 | indio_dev->setup_ops = &noop_ring_setup_ops; | |
878 | ||
f8c6f4e9 | 879 | ret = device_add(&indio_dev->dev); |
26d25ae3 JC |
880 | if (ret < 0) |
881 | goto error_unreg_eventset; | |
f8c6f4e9 JC |
882 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
883 | indio_dev->chrdev.owner = indio_dev->info->driver_module; | |
884 | ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); | |
26d25ae3 JC |
885 | if (ret < 0) |
886 | goto error_del_device; | |
847ec80b JC |
887 | return 0; |
888 | ||
847ec80b | 889 | error_del_device: |
f8c6f4e9 | 890 | device_del(&indio_dev->dev); |
26d25ae3 | 891 | error_unreg_eventset: |
f8c6f4e9 | 892 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 893 | error_free_sysfs: |
f8c6f4e9 | 894 | iio_device_unregister_sysfs(indio_dev); |
e553f182 MH |
895 | error_unreg_debugfs: |
896 | iio_device_unregister_debugfs(indio_dev); | |
847ec80b JC |
897 | error_ret: |
898 | return ret; | |
899 | } | |
900 | EXPORT_SYMBOL(iio_device_register); | |
901 | ||
f8c6f4e9 | 902 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 903 | { |
ac917a81 JC |
904 | mutex_lock(&indio_dev->info_exist_lock); |
905 | indio_dev->info = NULL; | |
906 | mutex_unlock(&indio_dev->info_exist_lock); | |
f8c6f4e9 | 907 | device_unregister(&indio_dev->dev); |
847ec80b JC |
908 | } |
909 | EXPORT_SYMBOL(iio_device_unregister); | |
847ec80b JC |
910 | subsys_initcall(iio_init); |
911 | module_exit(iio_exit); | |
912 | ||
913 | MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>"); | |
914 | MODULE_DESCRIPTION("Industrial I/O core"); | |
915 | MODULE_LICENSE("GPL"); |