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", |
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", | |
b65d6212 | 94 | [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", |
1d892719 JC |
95 | }; |
96 | ||
5fb21c82 JC |
97 | const struct iio_chan_spec |
98 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) | |
99 | { | |
100 | int i; | |
101 | ||
102 | for (i = 0; i < indio_dev->num_channels; i++) | |
103 | if (indio_dev->channels[i].scan_index == si) | |
104 | return &indio_dev->channels[i]; | |
105 | return NULL; | |
106 | } | |
107 | ||
847ec80b JC |
108 | /* This turns up an awful lot */ |
109 | ssize_t iio_read_const_attr(struct device *dev, | |
110 | struct device_attribute *attr, | |
111 | char *buf) | |
112 | { | |
113 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
114 | } | |
115 | EXPORT_SYMBOL(iio_read_const_attr); | |
116 | ||
847ec80b JC |
117 | static int __init iio_init(void) |
118 | { | |
119 | int ret; | |
120 | ||
5aaaeba8 JC |
121 | /* Register sysfs bus */ |
122 | ret = bus_register(&iio_bus_type); | |
847ec80b JC |
123 | if (ret < 0) { |
124 | printk(KERN_ERR | |
5aaaeba8 | 125 | "%s could not register bus type\n", |
847ec80b JC |
126 | __FILE__); |
127 | goto error_nothing; | |
128 | } | |
129 | ||
9aa1a167 JC |
130 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
131 | if (ret < 0) { | |
132 | printk(KERN_ERR "%s: failed to allocate char dev region\n", | |
133 | __FILE__); | |
5aaaeba8 | 134 | goto error_unregister_bus_type; |
9aa1a167 | 135 | } |
847ec80b | 136 | |
e553f182 MH |
137 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
138 | ||
847ec80b JC |
139 | return 0; |
140 | ||
5aaaeba8 JC |
141 | error_unregister_bus_type: |
142 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
143 | error_nothing: |
144 | return ret; | |
145 | } | |
146 | ||
147 | static void __exit iio_exit(void) | |
148 | { | |
9aa1a167 JC |
149 | if (iio_devt) |
150 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 151 | bus_unregister(&iio_bus_type); |
e553f182 MH |
152 | debugfs_remove(iio_debugfs_dentry); |
153 | } | |
154 | ||
155 | #if defined(CONFIG_DEBUG_FS) | |
e553f182 MH |
156 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
157 | size_t count, loff_t *ppos) | |
158 | { | |
159 | struct iio_dev *indio_dev = file->private_data; | |
160 | char buf[20]; | |
161 | unsigned val = 0; | |
162 | ssize_t len; | |
163 | int ret; | |
164 | ||
165 | ret = indio_dev->info->debugfs_reg_access(indio_dev, | |
166 | indio_dev->cached_reg_addr, | |
167 | 0, &val); | |
168 | if (ret) | |
169 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); | |
170 | ||
171 | len = snprintf(buf, sizeof(buf), "0x%X\n", val); | |
172 | ||
173 | return simple_read_from_buffer(userbuf, count, ppos, buf, len); | |
174 | } | |
175 | ||
176 | static ssize_t iio_debugfs_write_reg(struct file *file, | |
177 | const char __user *userbuf, size_t count, loff_t *ppos) | |
178 | { | |
179 | struct iio_dev *indio_dev = file->private_data; | |
180 | unsigned reg, val; | |
181 | char buf[80]; | |
182 | int ret; | |
183 | ||
184 | count = min_t(size_t, count, (sizeof(buf)-1)); | |
185 | if (copy_from_user(buf, userbuf, count)) | |
186 | return -EFAULT; | |
187 | ||
188 | buf[count] = 0; | |
189 | ||
190 | ret = sscanf(buf, "%i %i", ®, &val); | |
191 | ||
192 | switch (ret) { | |
193 | case 1: | |
194 | indio_dev->cached_reg_addr = reg; | |
195 | break; | |
196 | case 2: | |
197 | indio_dev->cached_reg_addr = reg; | |
198 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, | |
199 | val, NULL); | |
200 | if (ret) { | |
201 | dev_err(indio_dev->dev.parent, "%s: write failed\n", | |
202 | __func__); | |
203 | return ret; | |
204 | } | |
205 | break; | |
206 | default: | |
207 | return -EINVAL; | |
208 | } | |
209 | ||
210 | return count; | |
211 | } | |
212 | ||
213 | static const struct file_operations iio_debugfs_reg_fops = { | |
5a28c873 | 214 | .open = simple_open, |
e553f182 MH |
215 | .read = iio_debugfs_read_reg, |
216 | .write = iio_debugfs_write_reg, | |
217 | }; | |
218 | ||
219 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
220 | { | |
221 | debugfs_remove_recursive(indio_dev->debugfs_dentry); | |
847ec80b JC |
222 | } |
223 | ||
e553f182 MH |
224 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
225 | { | |
226 | struct dentry *d; | |
227 | ||
228 | if (indio_dev->info->debugfs_reg_access == NULL) | |
229 | return 0; | |
230 | ||
abd5a2fb | 231 | if (!iio_debugfs_dentry) |
e553f182 MH |
232 | return 0; |
233 | ||
234 | indio_dev->debugfs_dentry = | |
235 | debugfs_create_dir(dev_name(&indio_dev->dev), | |
236 | iio_debugfs_dentry); | |
e553f182 MH |
237 | if (indio_dev->debugfs_dentry == NULL) { |
238 | dev_warn(indio_dev->dev.parent, | |
239 | "Failed to create debugfs directory\n"); | |
240 | return -EFAULT; | |
241 | } | |
242 | ||
243 | d = debugfs_create_file("direct_reg_access", 0644, | |
244 | indio_dev->debugfs_dentry, | |
245 | indio_dev, &iio_debugfs_reg_fops); | |
246 | if (!d) { | |
247 | iio_device_unregister_debugfs(indio_dev); | |
248 | return -ENOMEM; | |
249 | } | |
250 | ||
251 | return 0; | |
252 | } | |
253 | #else | |
254 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) | |
255 | { | |
256 | return 0; | |
257 | } | |
258 | ||
259 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
260 | { | |
261 | } | |
262 | #endif /* CONFIG_DEBUG_FS */ | |
263 | ||
4fee7e16 LPC |
264 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
265 | struct device_attribute *attr, | |
266 | char *buf) | |
267 | { | |
268 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
269 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
270 | const struct iio_chan_spec_ext_info *ext_info; | |
271 | ||
272 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
273 | ||
fc6d1139 | 274 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
4fee7e16 LPC |
275 | } |
276 | ||
277 | static ssize_t iio_write_channel_ext_info(struct device *dev, | |
278 | struct device_attribute *attr, | |
279 | const char *buf, | |
280 | size_t len) | |
281 | { | |
282 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
283 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
284 | const struct iio_chan_spec_ext_info *ext_info; | |
285 | ||
286 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
287 | ||
fc6d1139 MH |
288 | return ext_info->write(indio_dev, ext_info->private, |
289 | this_attr->c, buf, len); | |
4fee7e16 LPC |
290 | } |
291 | ||
1d892719 JC |
292 | static ssize_t iio_read_channel_info(struct device *dev, |
293 | struct device_attribute *attr, | |
294 | char *buf) | |
847ec80b | 295 | { |
1d892719 JC |
296 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
297 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
298 | int val, val2; | |
67eedba3 | 299 | bool scale_db = false; |
6fe8135f JC |
300 | int ret = indio_dev->info->read_raw(indio_dev, this_attr->c, |
301 | &val, &val2, this_attr->address); | |
1d892719 JC |
302 | |
303 | if (ret < 0) | |
304 | return ret; | |
847ec80b | 305 | |
67eedba3 MH |
306 | switch (ret) { |
307 | case IIO_VAL_INT: | |
1d892719 | 308 | return sprintf(buf, "%d\n", val); |
67eedba3 MH |
309 | case IIO_VAL_INT_PLUS_MICRO_DB: |
310 | scale_db = true; | |
311 | case IIO_VAL_INT_PLUS_MICRO: | |
1d892719 | 312 | if (val2 < 0) |
67eedba3 MH |
313 | return sprintf(buf, "-%d.%06u%s\n", val, -val2, |
314 | scale_db ? " dB" : ""); | |
1d892719 | 315 | else |
67eedba3 MH |
316 | return sprintf(buf, "%d.%06u%s\n", val, val2, |
317 | scale_db ? " dB" : ""); | |
318 | case IIO_VAL_INT_PLUS_NANO: | |
71646e2c MH |
319 | if (val2 < 0) |
320 | return sprintf(buf, "-%d.%09u\n", val, -val2); | |
321 | else | |
322 | return sprintf(buf, "%d.%09u\n", val, val2); | |
67eedba3 | 323 | default: |
1d892719 | 324 | return 0; |
67eedba3 | 325 | } |
1d892719 JC |
326 | } |
327 | ||
328 | static ssize_t iio_write_channel_info(struct device *dev, | |
329 | struct device_attribute *attr, | |
330 | const char *buf, | |
331 | size_t len) | |
332 | { | |
333 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
334 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
5c04af04 | 335 | int ret, integer = 0, fract = 0, fract_mult = 100000; |
1d892719 JC |
336 | bool integer_part = true, negative = false; |
337 | ||
338 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 339 | if (!indio_dev->info->write_raw) |
1d892719 | 340 | return -EINVAL; |
5c04af04 MH |
341 | |
342 | if (indio_dev->info->write_raw_get_fmt) | |
343 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, | |
344 | this_attr->c, this_attr->address)) { | |
345 | case IIO_VAL_INT_PLUS_MICRO: | |
346 | fract_mult = 100000; | |
347 | break; | |
348 | case IIO_VAL_INT_PLUS_NANO: | |
349 | fract_mult = 100000000; | |
350 | break; | |
351 | default: | |
352 | return -EINVAL; | |
353 | } | |
354 | ||
1d892719 JC |
355 | if (buf[0] == '-') { |
356 | negative = true; | |
357 | buf++; | |
358 | } | |
5c04af04 | 359 | |
1d892719 JC |
360 | while (*buf) { |
361 | if ('0' <= *buf && *buf <= '9') { | |
362 | if (integer_part) | |
363 | integer = integer*10 + *buf - '0'; | |
364 | else { | |
5c04af04 MH |
365 | fract += fract_mult*(*buf - '0'); |
366 | if (fract_mult == 1) | |
1d892719 | 367 | break; |
5c04af04 | 368 | fract_mult /= 10; |
1d892719 JC |
369 | } |
370 | } else if (*buf == '\n') { | |
371 | if (*(buf + 1) == '\0') | |
372 | break; | |
373 | else | |
374 | return -EINVAL; | |
375 | } else if (*buf == '.') { | |
376 | integer_part = false; | |
377 | } else { | |
378 | return -EINVAL; | |
379 | } | |
380 | buf++; | |
381 | } | |
382 | if (negative) { | |
383 | if (integer) | |
384 | integer = -integer; | |
385 | else | |
5c04af04 | 386 | fract = -fract; |
1d892719 JC |
387 | } |
388 | ||
6fe8135f | 389 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 390 | integer, fract, this_attr->address); |
1d892719 JC |
391 | if (ret) |
392 | return ret; | |
393 | ||
394 | return len; | |
395 | } | |
396 | ||
df9c1c42 | 397 | static |
1d892719 JC |
398 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
399 | const char *postfix, | |
400 | struct iio_chan_spec const *chan, | |
401 | ssize_t (*readfunc)(struct device *dev, | |
402 | struct device_attribute *attr, | |
403 | char *buf), | |
404 | ssize_t (*writefunc)(struct device *dev, | |
405 | struct device_attribute *attr, | |
406 | const char *buf, | |
407 | size_t len), | |
408 | bool generic) | |
409 | { | |
410 | int ret; | |
411 | char *name_format, *full_postfix; | |
412 | sysfs_attr_init(&dev_attr->attr); | |
1d892719 | 413 | |
ade7ef7b | 414 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
0403e0d6 | 415 | if (chan->modified && !generic) { |
ade7ef7b JC |
416 | if (chan->extend_name) |
417 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
418 | iio_modifier_names[chan | |
419 | ->channel2], | |
420 | chan->extend_name, | |
421 | postfix); | |
422 | else | |
423 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
424 | iio_modifier_names[chan | |
425 | ->channel2], | |
426 | postfix); | |
427 | } else { | |
428 | if (chan->extend_name == NULL) | |
429 | full_postfix = kstrdup(postfix, GFP_KERNEL); | |
430 | else | |
431 | full_postfix = kasprintf(GFP_KERNEL, | |
432 | "%s_%s", | |
433 | chan->extend_name, | |
434 | postfix); | |
435 | } | |
436 | if (full_postfix == NULL) { | |
437 | ret = -ENOMEM; | |
438 | goto error_ret; | |
439 | } | |
1d892719 | 440 | |
4abf6f8b | 441 | if (chan->differential) { /* Differential can not have modifier */ |
ade7ef7b JC |
442 | if (generic) |
443 | name_format | |
444 | = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", | |
445 | iio_direction[chan->output], | |
446 | iio_chan_type_name_spec[chan->type], | |
447 | iio_chan_type_name_spec[chan->type], | |
448 | full_postfix); | |
449 | else if (chan->indexed) | |
450 | name_format | |
451 | = kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s", | |
452 | iio_direction[chan->output], | |
453 | iio_chan_type_name_spec[chan->type], | |
454 | chan->channel, | |
455 | iio_chan_type_name_spec[chan->type], | |
456 | chan->channel2, | |
457 | full_postfix); | |
458 | else { | |
459 | WARN_ON("Differential channels must be indexed\n"); | |
460 | ret = -EINVAL; | |
461 | goto error_free_full_postfix; | |
462 | } | |
463 | } else { /* Single ended */ | |
464 | if (generic) | |
465 | name_format | |
466 | = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
467 | iio_direction[chan->output], | |
468 | iio_chan_type_name_spec[chan->type], | |
469 | full_postfix); | |
470 | else if (chan->indexed) | |
471 | name_format | |
472 | = kasprintf(GFP_KERNEL, "%s_%s%d_%s", | |
473 | iio_direction[chan->output], | |
474 | iio_chan_type_name_spec[chan->type], | |
475 | chan->channel, | |
476 | full_postfix); | |
477 | else | |
478 | name_format | |
479 | = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
480 | iio_direction[chan->output], | |
481 | iio_chan_type_name_spec[chan->type], | |
482 | full_postfix); | |
483 | } | |
1d892719 JC |
484 | if (name_format == NULL) { |
485 | ret = -ENOMEM; | |
486 | goto error_free_full_postfix; | |
487 | } | |
488 | dev_attr->attr.name = kasprintf(GFP_KERNEL, | |
489 | name_format, | |
490 | chan->channel, | |
491 | chan->channel2); | |
492 | if (dev_attr->attr.name == NULL) { | |
493 | ret = -ENOMEM; | |
494 | goto error_free_name_format; | |
495 | } | |
496 | ||
497 | if (readfunc) { | |
498 | dev_attr->attr.mode |= S_IRUGO; | |
499 | dev_attr->show = readfunc; | |
500 | } | |
501 | ||
502 | if (writefunc) { | |
503 | dev_attr->attr.mode |= S_IWUSR; | |
504 | dev_attr->store = writefunc; | |
505 | } | |
506 | kfree(name_format); | |
507 | kfree(full_postfix); | |
508 | ||
509 | return 0; | |
510 | ||
511 | error_free_name_format: | |
512 | kfree(name_format); | |
513 | error_free_full_postfix: | |
514 | kfree(full_postfix); | |
515 | error_ret: | |
516 | return ret; | |
517 | } | |
518 | ||
df9c1c42 | 519 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
520 | { |
521 | kfree(dev_attr->attr.name); | |
522 | } | |
523 | ||
524 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
525 | struct iio_chan_spec const *chan, |
526 | ssize_t (*readfunc)(struct device *dev, | |
527 | struct device_attribute *attr, | |
528 | char *buf), | |
529 | ssize_t (*writefunc)(struct device *dev, | |
530 | struct device_attribute *attr, | |
531 | const char *buf, | |
532 | size_t len), | |
e614a54b | 533 | u64 mask, |
1d892719 JC |
534 | bool generic, |
535 | struct device *dev, | |
536 | struct list_head *attr_list) | |
537 | { | |
538 | int ret; | |
539 | struct iio_dev_attr *iio_attr, *t; | |
540 | ||
541 | iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL); | |
542 | if (iio_attr == NULL) { | |
543 | ret = -ENOMEM; | |
544 | goto error_ret; | |
545 | } | |
546 | ret = __iio_device_attr_init(&iio_attr->dev_attr, | |
547 | postfix, chan, | |
548 | readfunc, writefunc, generic); | |
549 | if (ret) | |
550 | goto error_iio_dev_attr_free; | |
551 | iio_attr->c = chan; | |
552 | iio_attr->address = mask; | |
553 | list_for_each_entry(t, attr_list, l) | |
554 | if (strcmp(t->dev_attr.attr.name, | |
555 | iio_attr->dev_attr.attr.name) == 0) { | |
556 | if (!generic) | |
557 | dev_err(dev, "tried to double register : %s\n", | |
558 | t->dev_attr.attr.name); | |
559 | ret = -EBUSY; | |
560 | goto error_device_attr_deinit; | |
561 | } | |
1d892719 JC |
562 | list_add(&iio_attr->l, attr_list); |
563 | ||
564 | return 0; | |
565 | ||
566 | error_device_attr_deinit: | |
567 | __iio_device_attr_deinit(&iio_attr->dev_attr); | |
568 | error_iio_dev_attr_free: | |
569 | kfree(iio_attr); | |
570 | error_ret: | |
571 | return ret; | |
572 | } | |
573 | ||
f8c6f4e9 | 574 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, |
1d892719 JC |
575 | struct iio_chan_spec const *chan) |
576 | { | |
5ccb3adb | 577 | int ret, attrcount = 0; |
75a973c7 | 578 | int i; |
5f420b42 | 579 | const struct iio_chan_spec_ext_info *ext_info; |
1d892719 | 580 | |
1d892719 JC |
581 | if (chan->channel < 0) |
582 | return 0; | |
75a973c7 | 583 | for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) { |
1d892719 | 584 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2], |
26d25ae3 | 585 | chan, |
1d892719 JC |
586 | &iio_read_channel_info, |
587 | &iio_write_channel_info, | |
c8a9f805 | 588 | i/2, |
1d892719 | 589 | !(i%2), |
f8c6f4e9 JC |
590 | &indio_dev->dev, |
591 | &indio_dev->channel_attr_list); | |
1d892719 JC |
592 | if (ret == -EBUSY && (i%2 == 0)) { |
593 | ret = 0; | |
594 | continue; | |
595 | } | |
596 | if (ret < 0) | |
597 | goto error_ret; | |
26d25ae3 | 598 | attrcount++; |
1d892719 | 599 | } |
5f420b42 LPC |
600 | |
601 | if (chan->ext_info) { | |
602 | unsigned int i = 0; | |
603 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { | |
604 | ret = __iio_add_chan_devattr(ext_info->name, | |
605 | chan, | |
606 | ext_info->read ? | |
607 | &iio_read_channel_ext_info : NULL, | |
608 | ext_info->write ? | |
609 | &iio_write_channel_ext_info : NULL, | |
610 | i, | |
611 | ext_info->shared, | |
612 | &indio_dev->dev, | |
613 | &indio_dev->channel_attr_list); | |
614 | i++; | |
615 | if (ret == -EBUSY && ext_info->shared) | |
616 | continue; | |
617 | ||
618 | if (ret) | |
619 | goto error_ret; | |
620 | ||
621 | attrcount++; | |
622 | } | |
623 | } | |
624 | ||
26d25ae3 | 625 | ret = attrcount; |
1d892719 JC |
626 | error_ret: |
627 | return ret; | |
628 | } | |
629 | ||
f8c6f4e9 | 630 | static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev, |
1d892719 JC |
631 | struct iio_dev_attr *p) |
632 | { | |
1d892719 JC |
633 | kfree(p->dev_attr.attr.name); |
634 | kfree(p); | |
635 | } | |
636 | ||
1b732888 JC |
637 | static ssize_t iio_show_dev_name(struct device *dev, |
638 | struct device_attribute *attr, | |
639 | char *buf) | |
640 | { | |
641 | struct iio_dev *indio_dev = dev_get_drvdata(dev); | |
642 | return sprintf(buf, "%s\n", indio_dev->name); | |
643 | } | |
644 | ||
645 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
646 | ||
f8c6f4e9 | 647 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 648 | { |
26d25ae3 | 649 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
1d892719 | 650 | struct iio_dev_attr *p, *n; |
26d25ae3 | 651 | struct attribute **attr; |
1d892719 | 652 | |
26d25ae3 | 653 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
654 | if (indio_dev->info->attrs) { |
655 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
656 | while (*attr++ != NULL) |
657 | attrcount_orig++; | |
847ec80b | 658 | } |
26d25ae3 | 659 | attrcount = attrcount_orig; |
1d892719 JC |
660 | /* |
661 | * New channel registration method - relies on the fact a group does | |
4abf6f8b | 662 | * not need to be initialized if it is name is NULL. |
1d892719 | 663 | */ |
f8c6f4e9 JC |
664 | INIT_LIST_HEAD(&indio_dev->channel_attr_list); |
665 | if (indio_dev->channels) | |
666 | for (i = 0; i < indio_dev->num_channels; i++) { | |
667 | ret = iio_device_add_channel_sysfs(indio_dev, | |
668 | &indio_dev | |
1d892719 JC |
669 | ->channels[i]); |
670 | if (ret < 0) | |
671 | goto error_clear_attrs; | |
26d25ae3 | 672 | attrcount += ret; |
1d892719 | 673 | } |
26d25ae3 | 674 | |
f8c6f4e9 | 675 | if (indio_dev->name) |
26d25ae3 JC |
676 | attrcount++; |
677 | ||
d83fb184 TM |
678 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
679 | sizeof(indio_dev->chan_attr_group.attrs[0]), | |
680 | GFP_KERNEL); | |
f8c6f4e9 | 681 | if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3 JC |
682 | ret = -ENOMEM; |
683 | goto error_clear_attrs; | |
1b732888 | 684 | } |
26d25ae3 | 685 | /* Copy across original attributes */ |
f8c6f4e9 JC |
686 | if (indio_dev->info->attrs) |
687 | memcpy(indio_dev->chan_attr_group.attrs, | |
688 | indio_dev->info->attrs->attrs, | |
689 | sizeof(indio_dev->chan_attr_group.attrs[0]) | |
26d25ae3 JC |
690 | *attrcount_orig); |
691 | attrn = attrcount_orig; | |
692 | /* Add all elements from the list. */ | |
f8c6f4e9 JC |
693 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
694 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; | |
695 | if (indio_dev->name) | |
696 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; | |
26d25ae3 | 697 | |
f8c6f4e9 JC |
698 | indio_dev->groups[indio_dev->groupcounter++] = |
699 | &indio_dev->chan_attr_group; | |
26d25ae3 | 700 | |
1d892719 | 701 | return 0; |
1b732888 | 702 | |
1d892719 JC |
703 | error_clear_attrs: |
704 | list_for_each_entry_safe(p, n, | |
f8c6f4e9 | 705 | &indio_dev->channel_attr_list, l) { |
1d892719 | 706 | list_del(&p->l); |
f8c6f4e9 | 707 | iio_device_remove_and_free_read_attr(indio_dev, p); |
1d892719 | 708 | } |
1d892719 | 709 | |
26d25ae3 | 710 | return ret; |
847ec80b JC |
711 | } |
712 | ||
f8c6f4e9 | 713 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 714 | { |
1d892719 JC |
715 | |
716 | struct iio_dev_attr *p, *n; | |
26d25ae3 | 717 | |
f8c6f4e9 | 718 | list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) { |
1d892719 | 719 | list_del(&p->l); |
f8c6f4e9 | 720 | iio_device_remove_and_free_read_attr(indio_dev, p); |
1d892719 | 721 | } |
f8c6f4e9 | 722 | kfree(indio_dev->chan_attr_group.attrs); |
847ec80b JC |
723 | } |
724 | ||
847ec80b JC |
725 | static void iio_dev_release(struct device *device) |
726 | { | |
f8c6f4e9 JC |
727 | struct iio_dev *indio_dev = container_of(device, struct iio_dev, dev); |
728 | cdev_del(&indio_dev->chrdev); | |
729 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) | |
730 | iio_device_unregister_trigger_consumer(indio_dev); | |
731 | iio_device_unregister_eventset(indio_dev); | |
732 | iio_device_unregister_sysfs(indio_dev); | |
e553f182 | 733 | iio_device_unregister_debugfs(indio_dev); |
847ec80b JC |
734 | } |
735 | ||
736 | static struct device_type iio_dev_type = { | |
737 | .name = "iio_device", | |
738 | .release = iio_dev_release, | |
739 | }; | |
740 | ||
7cbb7537 | 741 | struct iio_dev *iio_device_alloc(int sizeof_priv) |
847ec80b | 742 | { |
6f7c8ee5 JC |
743 | struct iio_dev *dev; |
744 | size_t alloc_size; | |
745 | ||
746 | alloc_size = sizeof(struct iio_dev); | |
747 | if (sizeof_priv) { | |
748 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); | |
749 | alloc_size += sizeof_priv; | |
750 | } | |
751 | /* ensure 32-byte alignment of whole construct ? */ | |
752 | alloc_size += IIO_ALIGN - 1; | |
753 | ||
754 | dev = kzalloc(alloc_size, GFP_KERNEL); | |
847ec80b JC |
755 | |
756 | if (dev) { | |
26d25ae3 | 757 | dev->dev.groups = dev->groups; |
847ec80b | 758 | dev->dev.type = &iio_dev_type; |
5aaaeba8 | 759 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
760 | device_initialize(&dev->dev); |
761 | dev_set_drvdata(&dev->dev, (void *)dev); | |
762 | mutex_init(&dev->mlock); | |
ac917a81 | 763 | mutex_init(&dev->info_exist_lock); |
a9e39f9e JC |
764 | |
765 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); | |
766 | if (dev->id < 0) { | |
767 | /* cannot use a dev_err as the name isn't available */ | |
768 | printk(KERN_ERR "Failed to get id\n"); | |
769 | kfree(dev); | |
770 | return NULL; | |
771 | } | |
772 | dev_set_name(&dev->dev, "iio:device%d", dev->id); | |
847ec80b JC |
773 | } |
774 | ||
775 | return dev; | |
776 | } | |
7cbb7537 | 777 | EXPORT_SYMBOL(iio_device_alloc); |
847ec80b | 778 | |
7cbb7537 | 779 | void iio_device_free(struct iio_dev *dev) |
847ec80b | 780 | { |
a9e39f9e JC |
781 | if (dev) { |
782 | ida_simple_remove(&iio_ida, dev->id); | |
1aa04278 | 783 | kfree(dev); |
a9e39f9e | 784 | } |
847ec80b | 785 | } |
7cbb7537 | 786 | EXPORT_SYMBOL(iio_device_free); |
847ec80b | 787 | |
1aa04278 | 788 | /** |
14555b14 | 789 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
1aa04278 JC |
790 | **/ |
791 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
792 | { | |
f8c6f4e9 | 793 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 794 | struct iio_dev, chrdev); |
bb01443e LPC |
795 | |
796 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
797 | return -EBUSY; | |
798 | ||
f8c6f4e9 | 799 | filp->private_data = indio_dev; |
30eb82f0 | 800 | |
79335140 | 801 | return 0; |
1aa04278 JC |
802 | } |
803 | ||
804 | /** | |
14555b14 | 805 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
1aa04278 JC |
806 | **/ |
807 | static int iio_chrdev_release(struct inode *inode, struct file *filp) | |
808 | { | |
bb01443e LPC |
809 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
810 | struct iio_dev, chrdev); | |
bb01443e | 811 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
1aa04278 JC |
812 | return 0; |
813 | } | |
814 | ||
815 | /* Somewhat of a cross file organization violation - ioctls here are actually | |
816 | * event related */ | |
817 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
818 | { | |
819 | struct iio_dev *indio_dev = filp->private_data; | |
820 | int __user *ip = (int __user *)arg; | |
821 | int fd; | |
822 | ||
823 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { | |
824 | fd = iio_event_getfd(indio_dev); | |
825 | if (copy_to_user(ip, &fd, sizeof(fd))) | |
826 | return -EFAULT; | |
827 | return 0; | |
828 | } | |
829 | return -EINVAL; | |
830 | } | |
831 | ||
14555b14 JC |
832 | static const struct file_operations iio_buffer_fileops = { |
833 | .read = iio_buffer_read_first_n_outer_addr, | |
1aa04278 JC |
834 | .release = iio_chrdev_release, |
835 | .open = iio_chrdev_open, | |
14555b14 | 836 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
837 | .owner = THIS_MODULE, |
838 | .llseek = noop_llseek, | |
839 | .unlocked_ioctl = iio_ioctl, | |
840 | .compat_ioctl = iio_ioctl, | |
841 | }; | |
842 | ||
0f1acee5 MH |
843 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
844 | ||
f8c6f4e9 | 845 | int iio_device_register(struct iio_dev *indio_dev) |
847ec80b JC |
846 | { |
847 | int ret; | |
848 | ||
1aa04278 | 849 | /* configure elements for the chrdev */ |
f8c6f4e9 | 850 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 851 | |
e553f182 MH |
852 | ret = iio_device_register_debugfs(indio_dev); |
853 | if (ret) { | |
854 | dev_err(indio_dev->dev.parent, | |
855 | "Failed to register debugfs interfaces\n"); | |
856 | goto error_ret; | |
857 | } | |
f8c6f4e9 | 858 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 859 | if (ret) { |
f8c6f4e9 | 860 | dev_err(indio_dev->dev.parent, |
847ec80b | 861 | "Failed to register sysfs interfaces\n"); |
e553f182 | 862 | goto error_unreg_debugfs; |
847ec80b | 863 | } |
f8c6f4e9 | 864 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 865 | if (ret) { |
f8c6f4e9 | 866 | dev_err(indio_dev->dev.parent, |
c849d253 | 867 | "Failed to register event set\n"); |
847ec80b JC |
868 | goto error_free_sysfs; |
869 | } | |
f8c6f4e9 JC |
870 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
871 | iio_device_register_trigger_consumer(indio_dev); | |
847ec80b | 872 | |
0f1acee5 MH |
873 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
874 | indio_dev->setup_ops == NULL) | |
875 | indio_dev->setup_ops = &noop_ring_setup_ops; | |
876 | ||
f8c6f4e9 | 877 | ret = device_add(&indio_dev->dev); |
26d25ae3 JC |
878 | if (ret < 0) |
879 | goto error_unreg_eventset; | |
f8c6f4e9 JC |
880 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
881 | indio_dev->chrdev.owner = indio_dev->info->driver_module; | |
882 | ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); | |
26d25ae3 JC |
883 | if (ret < 0) |
884 | goto error_del_device; | |
847ec80b JC |
885 | return 0; |
886 | ||
847ec80b | 887 | error_del_device: |
f8c6f4e9 | 888 | device_del(&indio_dev->dev); |
26d25ae3 | 889 | error_unreg_eventset: |
f8c6f4e9 | 890 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 891 | error_free_sysfs: |
f8c6f4e9 | 892 | iio_device_unregister_sysfs(indio_dev); |
e553f182 MH |
893 | error_unreg_debugfs: |
894 | iio_device_unregister_debugfs(indio_dev); | |
847ec80b JC |
895 | error_ret: |
896 | return ret; | |
897 | } | |
898 | EXPORT_SYMBOL(iio_device_register); | |
899 | ||
f8c6f4e9 | 900 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 901 | { |
ac917a81 JC |
902 | mutex_lock(&indio_dev->info_exist_lock); |
903 | indio_dev->info = NULL; | |
904 | mutex_unlock(&indio_dev->info_exist_lock); | |
f8c6f4e9 | 905 | device_unregister(&indio_dev->dev); |
847ec80b JC |
906 | } |
907 | EXPORT_SYMBOL(iio_device_unregister); | |
847ec80b JC |
908 | subsys_initcall(iio_init); |
909 | module_exit(iio_exit); | |
910 | ||
911 | MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>"); | |
912 | MODULE_DESCRIPTION("Industrial I/O core"); | |
913 | MODULE_LICENSE("GPL"); |