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> |
847ec80b | 25 | #include "iio.h" |
df9c1c42 | 26 | #include "iio_core.h" |
6aea1c36 | 27 | #include "iio_core_trigger.h" |
9dd1cb30 | 28 | #include "sysfs.h" |
af5046af | 29 | #include "events.h" |
9dd1cb30 | 30 | |
47c24fdd | 31 | /* IDA to assign each registered device a unique id*/ |
b156cf70 | 32 | static DEFINE_IDA(iio_ida); |
847ec80b | 33 | |
f625cb97 | 34 | static dev_t iio_devt; |
847ec80b JC |
35 | |
36 | #define IIO_DEV_MAX 256 | |
5aaaeba8 | 37 | struct bus_type iio_bus_type = { |
847ec80b | 38 | .name = "iio", |
847ec80b | 39 | }; |
5aaaeba8 | 40 | EXPORT_SYMBOL(iio_bus_type); |
847ec80b | 41 | |
1e8dfcc6 JC |
42 | static const char * const iio_data_type_name[] = { |
43 | [IIO_RAW] = "raw", | |
44 | [IIO_PROCESSED] = "input", | |
45 | }; | |
46 | ||
c6fc8062 JC |
47 | static const char * const iio_direction[] = { |
48 | [0] = "in", | |
49 | [1] = "out", | |
50 | }; | |
51 | ||
ade7ef7b | 52 | static const char * const iio_chan_type_name_spec[] = { |
c6fc8062 | 53 | [IIO_VOLTAGE] = "voltage", |
faf290e8 MH |
54 | [IIO_CURRENT] = "current", |
55 | [IIO_POWER] = "power", | |
9bff02f8 | 56 | [IIO_ACCEL] = "accel", |
41ea040c | 57 | [IIO_ANGL_VEL] = "anglvel", |
1d892719 | 58 | [IIO_MAGN] = "magn", |
9bff02f8 BF |
59 | [IIO_LIGHT] = "illuminance", |
60 | [IIO_INTENSITY] = "intensity", | |
f09f2c81 | 61 | [IIO_PROXIMITY] = "proximity", |
9bff02f8 | 62 | [IIO_TEMP] = "temp", |
1d892719 JC |
63 | [IIO_INCLI] = "incli", |
64 | [IIO_ROT] = "rot", | |
1d892719 | 65 | [IIO_ANGL] = "angl", |
9bff02f8 | 66 | [IIO_TIMESTAMP] = "timestamp", |
66dbe704 | 67 | [IIO_CAPACITANCE] = "capacitance", |
1d892719 JC |
68 | }; |
69 | ||
330c6c57 | 70 | static const char * const iio_modifier_names[] = { |
1d892719 JC |
71 | [IIO_MOD_X] = "x", |
72 | [IIO_MOD_Y] = "y", | |
73 | [IIO_MOD_Z] = "z", | |
330c6c57 JC |
74 | [IIO_MOD_LIGHT_BOTH] = "both", |
75 | [IIO_MOD_LIGHT_IR] = "ir", | |
1d892719 JC |
76 | }; |
77 | ||
78 | /* relies on pairs of these shared then separate */ | |
79 | static const char * const iio_chan_info_postfix[] = { | |
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", | |
1d892719 JC |
90 | }; |
91 | ||
5fb21c82 JC |
92 | const struct iio_chan_spec |
93 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) | |
94 | { | |
95 | int i; | |
96 | ||
97 | for (i = 0; i < indio_dev->num_channels; i++) | |
98 | if (indio_dev->channels[i].scan_index == si) | |
99 | return &indio_dev->channels[i]; | |
100 | return NULL; | |
101 | } | |
102 | ||
847ec80b JC |
103 | /* This turns up an awful lot */ |
104 | ssize_t iio_read_const_attr(struct device *dev, | |
105 | struct device_attribute *attr, | |
106 | char *buf) | |
107 | { | |
108 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
109 | } | |
110 | EXPORT_SYMBOL(iio_read_const_attr); | |
111 | ||
847ec80b JC |
112 | static int __init iio_init(void) |
113 | { | |
114 | int ret; | |
115 | ||
5aaaeba8 JC |
116 | /* Register sysfs bus */ |
117 | ret = bus_register(&iio_bus_type); | |
847ec80b JC |
118 | if (ret < 0) { |
119 | printk(KERN_ERR | |
5aaaeba8 | 120 | "%s could not register bus type\n", |
847ec80b JC |
121 | __FILE__); |
122 | goto error_nothing; | |
123 | } | |
124 | ||
9aa1a167 JC |
125 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
126 | if (ret < 0) { | |
127 | printk(KERN_ERR "%s: failed to allocate char dev region\n", | |
128 | __FILE__); | |
5aaaeba8 | 129 | goto error_unregister_bus_type; |
9aa1a167 | 130 | } |
847ec80b JC |
131 | |
132 | return 0; | |
133 | ||
5aaaeba8 JC |
134 | error_unregister_bus_type: |
135 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
136 | error_nothing: |
137 | return ret; | |
138 | } | |
139 | ||
140 | static void __exit iio_exit(void) | |
141 | { | |
9aa1a167 JC |
142 | if (iio_devt) |
143 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 144 | bus_unregister(&iio_bus_type); |
847ec80b JC |
145 | } |
146 | ||
1d892719 JC |
147 | static ssize_t iio_read_channel_info(struct device *dev, |
148 | struct device_attribute *attr, | |
149 | char *buf) | |
847ec80b | 150 | { |
1d892719 JC |
151 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
152 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
153 | int val, val2; | |
6fe8135f JC |
154 | int ret = indio_dev->info->read_raw(indio_dev, this_attr->c, |
155 | &val, &val2, this_attr->address); | |
1d892719 JC |
156 | |
157 | if (ret < 0) | |
158 | return ret; | |
847ec80b | 159 | |
1d892719 JC |
160 | if (ret == IIO_VAL_INT) |
161 | return sprintf(buf, "%d\n", val); | |
162 | else if (ret == IIO_VAL_INT_PLUS_MICRO) { | |
163 | if (val2 < 0) | |
164 | return sprintf(buf, "-%d.%06u\n", val, -val2); | |
165 | else | |
166 | return sprintf(buf, "%d.%06u\n", val, val2); | |
71646e2c MH |
167 | } else if (ret == IIO_VAL_INT_PLUS_NANO) { |
168 | if (val2 < 0) | |
169 | return sprintf(buf, "-%d.%09u\n", val, -val2); | |
170 | else | |
171 | return sprintf(buf, "%d.%09u\n", val, val2); | |
1d892719 JC |
172 | } else |
173 | return 0; | |
174 | } | |
175 | ||
176 | static ssize_t iio_write_channel_info(struct device *dev, | |
177 | struct device_attribute *attr, | |
178 | const char *buf, | |
179 | size_t len) | |
180 | { | |
181 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
182 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
5c04af04 | 183 | int ret, integer = 0, fract = 0, fract_mult = 100000; |
1d892719 JC |
184 | bool integer_part = true, negative = false; |
185 | ||
186 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 187 | if (!indio_dev->info->write_raw) |
1d892719 | 188 | return -EINVAL; |
5c04af04 MH |
189 | |
190 | if (indio_dev->info->write_raw_get_fmt) | |
191 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, | |
192 | this_attr->c, this_attr->address)) { | |
193 | case IIO_VAL_INT_PLUS_MICRO: | |
194 | fract_mult = 100000; | |
195 | break; | |
196 | case IIO_VAL_INT_PLUS_NANO: | |
197 | fract_mult = 100000000; | |
198 | break; | |
199 | default: | |
200 | return -EINVAL; | |
201 | } | |
202 | ||
1d892719 JC |
203 | if (buf[0] == '-') { |
204 | negative = true; | |
205 | buf++; | |
206 | } | |
5c04af04 | 207 | |
1d892719 JC |
208 | while (*buf) { |
209 | if ('0' <= *buf && *buf <= '9') { | |
210 | if (integer_part) | |
211 | integer = integer*10 + *buf - '0'; | |
212 | else { | |
5c04af04 MH |
213 | fract += fract_mult*(*buf - '0'); |
214 | if (fract_mult == 1) | |
1d892719 | 215 | break; |
5c04af04 | 216 | fract_mult /= 10; |
1d892719 JC |
217 | } |
218 | } else if (*buf == '\n') { | |
219 | if (*(buf + 1) == '\0') | |
220 | break; | |
221 | else | |
222 | return -EINVAL; | |
223 | } else if (*buf == '.') { | |
224 | integer_part = false; | |
225 | } else { | |
226 | return -EINVAL; | |
227 | } | |
228 | buf++; | |
229 | } | |
230 | if (negative) { | |
231 | if (integer) | |
232 | integer = -integer; | |
233 | else | |
5c04af04 | 234 | fract = -fract; |
1d892719 JC |
235 | } |
236 | ||
6fe8135f | 237 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 238 | integer, fract, this_attr->address); |
1d892719 JC |
239 | if (ret) |
240 | return ret; | |
241 | ||
242 | return len; | |
243 | } | |
244 | ||
df9c1c42 | 245 | static |
1d892719 JC |
246 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
247 | const char *postfix, | |
248 | struct iio_chan_spec const *chan, | |
249 | ssize_t (*readfunc)(struct device *dev, | |
250 | struct device_attribute *attr, | |
251 | char *buf), | |
252 | ssize_t (*writefunc)(struct device *dev, | |
253 | struct device_attribute *attr, | |
254 | const char *buf, | |
255 | size_t len), | |
256 | bool generic) | |
257 | { | |
258 | int ret; | |
259 | char *name_format, *full_postfix; | |
260 | sysfs_attr_init(&dev_attr->attr); | |
1d892719 | 261 | |
ade7ef7b | 262 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
0403e0d6 | 263 | if (chan->modified && !generic) { |
ade7ef7b JC |
264 | if (chan->extend_name) |
265 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
266 | iio_modifier_names[chan | |
267 | ->channel2], | |
268 | chan->extend_name, | |
269 | postfix); | |
270 | else | |
271 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
272 | iio_modifier_names[chan | |
273 | ->channel2], | |
274 | postfix); | |
275 | } else { | |
276 | if (chan->extend_name == NULL) | |
277 | full_postfix = kstrdup(postfix, GFP_KERNEL); | |
278 | else | |
279 | full_postfix = kasprintf(GFP_KERNEL, | |
280 | "%s_%s", | |
281 | chan->extend_name, | |
282 | postfix); | |
283 | } | |
284 | if (full_postfix == NULL) { | |
285 | ret = -ENOMEM; | |
286 | goto error_ret; | |
287 | } | |
1d892719 | 288 | |
ade7ef7b JC |
289 | if (chan->differential) { /* Differential can not have modifier */ |
290 | if (generic) | |
291 | name_format | |
292 | = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", | |
293 | iio_direction[chan->output], | |
294 | iio_chan_type_name_spec[chan->type], | |
295 | iio_chan_type_name_spec[chan->type], | |
296 | full_postfix); | |
297 | else if (chan->indexed) | |
298 | name_format | |
299 | = kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s", | |
300 | iio_direction[chan->output], | |
301 | iio_chan_type_name_spec[chan->type], | |
302 | chan->channel, | |
303 | iio_chan_type_name_spec[chan->type], | |
304 | chan->channel2, | |
305 | full_postfix); | |
306 | else { | |
307 | WARN_ON("Differential channels must be indexed\n"); | |
308 | ret = -EINVAL; | |
309 | goto error_free_full_postfix; | |
310 | } | |
311 | } else { /* Single ended */ | |
312 | if (generic) | |
313 | name_format | |
314 | = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
315 | iio_direction[chan->output], | |
316 | iio_chan_type_name_spec[chan->type], | |
317 | full_postfix); | |
318 | else if (chan->indexed) | |
319 | name_format | |
320 | = kasprintf(GFP_KERNEL, "%s_%s%d_%s", | |
321 | iio_direction[chan->output], | |
322 | iio_chan_type_name_spec[chan->type], | |
323 | chan->channel, | |
324 | full_postfix); | |
325 | else | |
326 | name_format | |
327 | = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
328 | iio_direction[chan->output], | |
329 | iio_chan_type_name_spec[chan->type], | |
330 | full_postfix); | |
331 | } | |
1d892719 JC |
332 | if (name_format == NULL) { |
333 | ret = -ENOMEM; | |
334 | goto error_free_full_postfix; | |
335 | } | |
336 | dev_attr->attr.name = kasprintf(GFP_KERNEL, | |
337 | name_format, | |
338 | chan->channel, | |
339 | chan->channel2); | |
340 | if (dev_attr->attr.name == NULL) { | |
341 | ret = -ENOMEM; | |
342 | goto error_free_name_format; | |
343 | } | |
344 | ||
345 | if (readfunc) { | |
346 | dev_attr->attr.mode |= S_IRUGO; | |
347 | dev_attr->show = readfunc; | |
348 | } | |
349 | ||
350 | if (writefunc) { | |
351 | dev_attr->attr.mode |= S_IWUSR; | |
352 | dev_attr->store = writefunc; | |
353 | } | |
354 | kfree(name_format); | |
355 | kfree(full_postfix); | |
356 | ||
357 | return 0; | |
358 | ||
359 | error_free_name_format: | |
360 | kfree(name_format); | |
361 | error_free_full_postfix: | |
362 | kfree(full_postfix); | |
363 | error_ret: | |
364 | return ret; | |
365 | } | |
366 | ||
df9c1c42 | 367 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
368 | { |
369 | kfree(dev_attr->attr.name); | |
370 | } | |
371 | ||
372 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
373 | struct iio_chan_spec const *chan, |
374 | ssize_t (*readfunc)(struct device *dev, | |
375 | struct device_attribute *attr, | |
376 | char *buf), | |
377 | ssize_t (*writefunc)(struct device *dev, | |
378 | struct device_attribute *attr, | |
379 | const char *buf, | |
380 | size_t len), | |
e614a54b | 381 | u64 mask, |
1d892719 JC |
382 | bool generic, |
383 | struct device *dev, | |
384 | struct list_head *attr_list) | |
385 | { | |
386 | int ret; | |
387 | struct iio_dev_attr *iio_attr, *t; | |
388 | ||
389 | iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL); | |
390 | if (iio_attr == NULL) { | |
391 | ret = -ENOMEM; | |
392 | goto error_ret; | |
393 | } | |
394 | ret = __iio_device_attr_init(&iio_attr->dev_attr, | |
395 | postfix, chan, | |
396 | readfunc, writefunc, generic); | |
397 | if (ret) | |
398 | goto error_iio_dev_attr_free; | |
399 | iio_attr->c = chan; | |
400 | iio_attr->address = mask; | |
401 | list_for_each_entry(t, attr_list, l) | |
402 | if (strcmp(t->dev_attr.attr.name, | |
403 | iio_attr->dev_attr.attr.name) == 0) { | |
404 | if (!generic) | |
405 | dev_err(dev, "tried to double register : %s\n", | |
406 | t->dev_attr.attr.name); | |
407 | ret = -EBUSY; | |
408 | goto error_device_attr_deinit; | |
409 | } | |
1d892719 JC |
410 | list_add(&iio_attr->l, attr_list); |
411 | ||
412 | return 0; | |
413 | ||
414 | error_device_attr_deinit: | |
415 | __iio_device_attr_deinit(&iio_attr->dev_attr); | |
416 | error_iio_dev_attr_free: | |
417 | kfree(iio_attr); | |
418 | error_ret: | |
419 | return ret; | |
420 | } | |
421 | ||
f8c6f4e9 | 422 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, |
1d892719 JC |
423 | struct iio_chan_spec const *chan) |
424 | { | |
26d25ae3 | 425 | int ret, i, attrcount = 0; |
1d892719 | 426 | |
1d892719 JC |
427 | if (chan->channel < 0) |
428 | return 0; | |
1e8dfcc6 JC |
429 | |
430 | ret = __iio_add_chan_devattr(iio_data_type_name[chan->processed_val], | |
26d25ae3 | 431 | chan, |
1e8dfcc6 | 432 | &iio_read_channel_info, |
c6fc8062 | 433 | (chan->output ? |
1e8dfcc6 JC |
434 | &iio_write_channel_info : NULL), |
435 | 0, | |
436 | 0, | |
f8c6f4e9 JC |
437 | &indio_dev->dev, |
438 | &indio_dev->channel_attr_list); | |
1d892719 JC |
439 | if (ret) |
440 | goto error_ret; | |
26d25ae3 | 441 | attrcount++; |
1d892719 JC |
442 | |
443 | for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) { | |
444 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2], | |
26d25ae3 | 445 | chan, |
1d892719 JC |
446 | &iio_read_channel_info, |
447 | &iio_write_channel_info, | |
c8a9f805 | 448 | i/2, |
1d892719 | 449 | !(i%2), |
f8c6f4e9 JC |
450 | &indio_dev->dev, |
451 | &indio_dev->channel_attr_list); | |
1d892719 JC |
452 | if (ret == -EBUSY && (i%2 == 0)) { |
453 | ret = 0; | |
454 | continue; | |
455 | } | |
456 | if (ret < 0) | |
457 | goto error_ret; | |
26d25ae3 | 458 | attrcount++; |
1d892719 | 459 | } |
26d25ae3 | 460 | ret = attrcount; |
1d892719 JC |
461 | error_ret: |
462 | return ret; | |
463 | } | |
464 | ||
f8c6f4e9 | 465 | static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev, |
1d892719 JC |
466 | struct iio_dev_attr *p) |
467 | { | |
1d892719 JC |
468 | kfree(p->dev_attr.attr.name); |
469 | kfree(p); | |
470 | } | |
471 | ||
1b732888 JC |
472 | static ssize_t iio_show_dev_name(struct device *dev, |
473 | struct device_attribute *attr, | |
474 | char *buf) | |
475 | { | |
476 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
477 | return sprintf(buf, "%s\n", indio_dev->name); | |
478 | } | |
479 | ||
480 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
481 | ||
f8c6f4e9 | 482 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 483 | { |
26d25ae3 | 484 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
1d892719 | 485 | struct iio_dev_attr *p, *n; |
26d25ae3 | 486 | struct attribute **attr; |
1d892719 | 487 | |
26d25ae3 | 488 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
489 | if (indio_dev->info->attrs) { |
490 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
491 | while (*attr++ != NULL) |
492 | attrcount_orig++; | |
847ec80b | 493 | } |
26d25ae3 | 494 | attrcount = attrcount_orig; |
1d892719 JC |
495 | /* |
496 | * New channel registration method - relies on the fact a group does | |
497 | * not need to be initialized if it is name is NULL. | |
498 | */ | |
f8c6f4e9 JC |
499 | INIT_LIST_HEAD(&indio_dev->channel_attr_list); |
500 | if (indio_dev->channels) | |
501 | for (i = 0; i < indio_dev->num_channels; i++) { | |
502 | ret = iio_device_add_channel_sysfs(indio_dev, | |
503 | &indio_dev | |
1d892719 JC |
504 | ->channels[i]); |
505 | if (ret < 0) | |
506 | goto error_clear_attrs; | |
26d25ae3 | 507 | attrcount += ret; |
1d892719 | 508 | } |
26d25ae3 | 509 | |
f8c6f4e9 | 510 | if (indio_dev->name) |
26d25ae3 JC |
511 | attrcount++; |
512 | ||
d83fb184 TM |
513 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
514 | sizeof(indio_dev->chan_attr_group.attrs[0]), | |
515 | GFP_KERNEL); | |
f8c6f4e9 | 516 | if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3 JC |
517 | ret = -ENOMEM; |
518 | goto error_clear_attrs; | |
1b732888 | 519 | } |
26d25ae3 | 520 | /* Copy across original attributes */ |
f8c6f4e9 JC |
521 | if (indio_dev->info->attrs) |
522 | memcpy(indio_dev->chan_attr_group.attrs, | |
523 | indio_dev->info->attrs->attrs, | |
524 | sizeof(indio_dev->chan_attr_group.attrs[0]) | |
26d25ae3 JC |
525 | *attrcount_orig); |
526 | attrn = attrcount_orig; | |
527 | /* Add all elements from the list. */ | |
f8c6f4e9 JC |
528 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
529 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; | |
530 | if (indio_dev->name) | |
531 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; | |
26d25ae3 | 532 | |
f8c6f4e9 JC |
533 | indio_dev->groups[indio_dev->groupcounter++] = |
534 | &indio_dev->chan_attr_group; | |
26d25ae3 | 535 | |
1d892719 | 536 | return 0; |
1b732888 | 537 | |
1d892719 JC |
538 | error_clear_attrs: |
539 | list_for_each_entry_safe(p, n, | |
f8c6f4e9 | 540 | &indio_dev->channel_attr_list, l) { |
1d892719 | 541 | list_del(&p->l); |
f8c6f4e9 | 542 | iio_device_remove_and_free_read_attr(indio_dev, p); |
1d892719 | 543 | } |
1d892719 | 544 | |
26d25ae3 | 545 | return ret; |
847ec80b JC |
546 | } |
547 | ||
f8c6f4e9 | 548 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 549 | { |
1d892719 JC |
550 | |
551 | struct iio_dev_attr *p, *n; | |
26d25ae3 | 552 | |
f8c6f4e9 | 553 | list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) { |
1d892719 | 554 | list_del(&p->l); |
f8c6f4e9 | 555 | iio_device_remove_and_free_read_attr(indio_dev, p); |
1d892719 | 556 | } |
f8c6f4e9 | 557 | kfree(indio_dev->chan_attr_group.attrs); |
847ec80b JC |
558 | } |
559 | ||
847ec80b JC |
560 | static void iio_dev_release(struct device *device) |
561 | { | |
f8c6f4e9 JC |
562 | struct iio_dev *indio_dev = container_of(device, struct iio_dev, dev); |
563 | cdev_del(&indio_dev->chrdev); | |
564 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) | |
565 | iio_device_unregister_trigger_consumer(indio_dev); | |
566 | iio_device_unregister_eventset(indio_dev); | |
567 | iio_device_unregister_sysfs(indio_dev); | |
847ec80b JC |
568 | } |
569 | ||
570 | static struct device_type iio_dev_type = { | |
571 | .name = "iio_device", | |
572 | .release = iio_dev_release, | |
573 | }; | |
574 | ||
6f7c8ee5 | 575 | struct iio_dev *iio_allocate_device(int sizeof_priv) |
847ec80b | 576 | { |
6f7c8ee5 JC |
577 | struct iio_dev *dev; |
578 | size_t alloc_size; | |
579 | ||
580 | alloc_size = sizeof(struct iio_dev); | |
581 | if (sizeof_priv) { | |
582 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); | |
583 | alloc_size += sizeof_priv; | |
584 | } | |
585 | /* ensure 32-byte alignment of whole construct ? */ | |
586 | alloc_size += IIO_ALIGN - 1; | |
587 | ||
588 | dev = kzalloc(alloc_size, GFP_KERNEL); | |
847ec80b JC |
589 | |
590 | if (dev) { | |
26d25ae3 | 591 | dev->dev.groups = dev->groups; |
847ec80b | 592 | dev->dev.type = &iio_dev_type; |
5aaaeba8 | 593 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
594 | device_initialize(&dev->dev); |
595 | dev_set_drvdata(&dev->dev, (void *)dev); | |
596 | mutex_init(&dev->mlock); | |
ac917a81 | 597 | mutex_init(&dev->info_exist_lock); |
a9e39f9e JC |
598 | |
599 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); | |
600 | if (dev->id < 0) { | |
601 | /* cannot use a dev_err as the name isn't available */ | |
602 | printk(KERN_ERR "Failed to get id\n"); | |
603 | kfree(dev); | |
604 | return NULL; | |
605 | } | |
606 | dev_set_name(&dev->dev, "iio:device%d", dev->id); | |
847ec80b JC |
607 | } |
608 | ||
609 | return dev; | |
610 | } | |
611 | EXPORT_SYMBOL(iio_allocate_device); | |
612 | ||
613 | void iio_free_device(struct iio_dev *dev) | |
614 | { | |
a9e39f9e JC |
615 | if (dev) { |
616 | ida_simple_remove(&iio_ida, dev->id); | |
1aa04278 | 617 | kfree(dev); |
a9e39f9e | 618 | } |
847ec80b JC |
619 | } |
620 | EXPORT_SYMBOL(iio_free_device); | |
621 | ||
1aa04278 | 622 | /** |
14555b14 | 623 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
1aa04278 JC |
624 | **/ |
625 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
626 | { | |
f8c6f4e9 | 627 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 628 | struct iio_dev, chrdev); |
bb01443e LPC |
629 | |
630 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
631 | return -EBUSY; | |
632 | ||
f8c6f4e9 | 633 | filp->private_data = indio_dev; |
30eb82f0 | 634 | |
79335140 | 635 | return 0; |
1aa04278 JC |
636 | } |
637 | ||
638 | /** | |
14555b14 | 639 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
1aa04278 JC |
640 | **/ |
641 | static int iio_chrdev_release(struct inode *inode, struct file *filp) | |
642 | { | |
bb01443e LPC |
643 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
644 | struct iio_dev, chrdev); | |
bb01443e | 645 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
1aa04278 JC |
646 | return 0; |
647 | } | |
648 | ||
649 | /* Somewhat of a cross file organization violation - ioctls here are actually | |
650 | * event related */ | |
651 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
652 | { | |
653 | struct iio_dev *indio_dev = filp->private_data; | |
654 | int __user *ip = (int __user *)arg; | |
655 | int fd; | |
656 | ||
657 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { | |
658 | fd = iio_event_getfd(indio_dev); | |
659 | if (copy_to_user(ip, &fd, sizeof(fd))) | |
660 | return -EFAULT; | |
661 | return 0; | |
662 | } | |
663 | return -EINVAL; | |
664 | } | |
665 | ||
14555b14 JC |
666 | static const struct file_operations iio_buffer_fileops = { |
667 | .read = iio_buffer_read_first_n_outer_addr, | |
1aa04278 JC |
668 | .release = iio_chrdev_release, |
669 | .open = iio_chrdev_open, | |
14555b14 | 670 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
671 | .owner = THIS_MODULE, |
672 | .llseek = noop_llseek, | |
673 | .unlocked_ioctl = iio_ioctl, | |
674 | .compat_ioctl = iio_ioctl, | |
675 | }; | |
676 | ||
f8c6f4e9 | 677 | int iio_device_register(struct iio_dev *indio_dev) |
847ec80b JC |
678 | { |
679 | int ret; | |
680 | ||
1aa04278 | 681 | /* configure elements for the chrdev */ |
f8c6f4e9 | 682 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 683 | |
f8c6f4e9 | 684 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 685 | if (ret) { |
f8c6f4e9 | 686 | dev_err(indio_dev->dev.parent, |
847ec80b | 687 | "Failed to register sysfs interfaces\n"); |
a9e39f9e | 688 | goto error_ret; |
847ec80b | 689 | } |
f8c6f4e9 | 690 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 691 | if (ret) { |
f8c6f4e9 | 692 | dev_err(indio_dev->dev.parent, |
c849d253 | 693 | "Failed to register event set\n"); |
847ec80b JC |
694 | goto error_free_sysfs; |
695 | } | |
f8c6f4e9 JC |
696 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
697 | iio_device_register_trigger_consumer(indio_dev); | |
847ec80b | 698 | |
f8c6f4e9 | 699 | ret = device_add(&indio_dev->dev); |
26d25ae3 JC |
700 | if (ret < 0) |
701 | goto error_unreg_eventset; | |
f8c6f4e9 JC |
702 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
703 | indio_dev->chrdev.owner = indio_dev->info->driver_module; | |
704 | ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); | |
26d25ae3 JC |
705 | if (ret < 0) |
706 | goto error_del_device; | |
847ec80b JC |
707 | return 0; |
708 | ||
847ec80b | 709 | error_del_device: |
f8c6f4e9 | 710 | device_del(&indio_dev->dev); |
26d25ae3 | 711 | error_unreg_eventset: |
f8c6f4e9 | 712 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 713 | error_free_sysfs: |
f8c6f4e9 | 714 | iio_device_unregister_sysfs(indio_dev); |
847ec80b JC |
715 | error_ret: |
716 | return ret; | |
717 | } | |
718 | EXPORT_SYMBOL(iio_device_register); | |
719 | ||
f8c6f4e9 | 720 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 721 | { |
ac917a81 JC |
722 | mutex_lock(&indio_dev->info_exist_lock); |
723 | indio_dev->info = NULL; | |
724 | mutex_unlock(&indio_dev->info_exist_lock); | |
f8c6f4e9 | 725 | device_unregister(&indio_dev->dev); |
847ec80b JC |
726 | } |
727 | EXPORT_SYMBOL(iio_device_unregister); | |
847ec80b JC |
728 | subsys_initcall(iio_init); |
729 | module_exit(iio_exit); | |
730 | ||
731 | MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>"); | |
732 | MODULE_DESCRIPTION("Industrial I/O core"); | |
733 | MODULE_LICENSE("GPL"); |