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