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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> |
19 | #include <linux/poll.h> |
20 | #include <linux/sched.h> |
21 | #include <linux/wait.h> |
22 | #include <linux/cdev.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/anon_inodes.h> |
25 | #include <linux/debugfs.h> |
26 | #include <linux/iio/iio.h> |
27 | #include "iio_core.h" |
28 | #include "iio_core_trigger.h" |
29 | #include <linux/iio/sysfs.h> |
30 | #include <linux/iio/events.h> |
31 | |
32 | /* IDA to assign each registered device a unique id */ |
33 | static DEFINE_IDA(iio_ida); |
34 | |
35 | static dev_t iio_devt; |
36 | |
37 | #define IIO_DEV_MAX 256 |
38 | struct bus_type iio_bus_type = { |
39 | .name = "iio", |
40 | }; |
41 | EXPORT_SYMBOL(iio_bus_type); |
42 | |
43 | static struct dentry *iio_debugfs_dentry; |
44 | |
45 | static const char * const iio_direction[] = { |
46 | [0] = "in", |
47 | [1] = "out", |
48 | }; |
49 | |
50 | static const char * const iio_chan_type_name_spec[] = { |
51 | [IIO_VOLTAGE] = "voltage", |
52 | [IIO_CURRENT] = "current", |
53 | [IIO_POWER] = "power", |
54 | [IIO_ACCEL] = "accel", |
55 | [IIO_ANGL_VEL] = "anglvel", |
56 | [IIO_MAGN] = "magn", |
57 | [IIO_LIGHT] = "illuminance", |
58 | [IIO_INTENSITY] = "intensity", |
59 | [IIO_PROXIMITY] = "proximity", |
60 | [IIO_TEMP] = "temp", |
61 | [IIO_INCLI] = "incli", |
62 | [IIO_ROT] = "rot", |
63 | [IIO_ANGL] = "angl", |
64 | [IIO_TIMESTAMP] = "timestamp", |
65 | [IIO_CAPACITANCE] = "capacitance", |
66 | [IIO_ALTVOLTAGE] = "altvoltage", |
67 | [IIO_CCT] = "cct", |
68 | [IIO_PRESSURE] = "pressure", |
69 | }; |
70 | |
71 | static const char * const iio_modifier_names[] = { |
72 | [IIO_MOD_X] = "x", |
73 | [IIO_MOD_Y] = "y", |
74 | [IIO_MOD_Z] = "z", |
75 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", |
76 | [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", |
77 | [IIO_MOD_LIGHT_BOTH] = "both", |
78 | [IIO_MOD_LIGHT_IR] = "ir", |
79 | [IIO_MOD_LIGHT_CLEAR] = "clear", |
80 | [IIO_MOD_LIGHT_RED] = "red", |
81 | [IIO_MOD_LIGHT_GREEN] = "green", |
82 | [IIO_MOD_LIGHT_BLUE] = "blue", |
83 | }; |
84 | |
85 | /* relies on pairs of these shared then separate */ |
86 | static const char * const iio_chan_info_postfix[] = { |
87 | [IIO_CHAN_INFO_RAW] = "raw", |
88 | [IIO_CHAN_INFO_PROCESSED] = "input", |
89 | [IIO_CHAN_INFO_SCALE] = "scale", |
90 | [IIO_CHAN_INFO_OFFSET] = "offset", |
91 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", |
92 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", |
93 | [IIO_CHAN_INFO_PEAK] = "peak_raw", |
94 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", |
95 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", |
96 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", |
97 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
98 | = "filter_low_pass_3db_frequency", |
99 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", |
100 | [IIO_CHAN_INFO_FREQUENCY] = "frequency", |
101 | [IIO_CHAN_INFO_PHASE] = "phase", |
102 | [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", |
103 | [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", |
104 | }; |
105 | |
106 | const struct iio_chan_spec |
107 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) |
108 | { |
109 | int i; |
110 | |
111 | for (i = 0; i < indio_dev->num_channels; i++) |
112 | if (indio_dev->channels[i].scan_index == si) |
113 | return &indio_dev->channels[i]; |
114 | return NULL; |
115 | } |
116 | |
117 | /* This turns up an awful lot */ |
118 | ssize_t iio_read_const_attr(struct device *dev, |
119 | struct device_attribute *attr, |
120 | char *buf) |
121 | { |
122 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); |
123 | } |
124 | EXPORT_SYMBOL(iio_read_const_attr); |
125 | |
126 | static int __init iio_init(void) |
127 | { |
128 | int ret; |
129 | |
130 | /* Register sysfs bus */ |
131 | ret = bus_register(&iio_bus_type); |
132 | if (ret < 0) { |
133 | printk(KERN_ERR |
134 | "%s could not register bus type\n", |
135 | __FILE__); |
136 | goto error_nothing; |
137 | } |
138 | |
139 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
140 | if (ret < 0) { |
141 | printk(KERN_ERR "%s: failed to allocate char dev region\n", |
142 | __FILE__); |
143 | goto error_unregister_bus_type; |
144 | } |
145 | |
146 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
147 | |
148 | return 0; |
149 | |
150 | error_unregister_bus_type: |
151 | bus_unregister(&iio_bus_type); |
152 | error_nothing: |
153 | return ret; |
154 | } |
155 | |
156 | static void __exit iio_exit(void) |
157 | { |
158 | if (iio_devt) |
159 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); |
160 | bus_unregister(&iio_bus_type); |
161 | debugfs_remove(iio_debugfs_dentry); |
162 | } |
163 | |
164 | #if defined(CONFIG_DEBUG_FS) |
165 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
166 | size_t count, loff_t *ppos) |
167 | { |
168 | struct iio_dev *indio_dev = file->private_data; |
169 | char buf[20]; |
170 | unsigned val = 0; |
171 | ssize_t len; |
172 | int ret; |
173 | |
174 | ret = indio_dev->info->debugfs_reg_access(indio_dev, |
175 | indio_dev->cached_reg_addr, |
176 | 0, &val); |
177 | if (ret) |
178 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); |
179 | |
180 | len = snprintf(buf, sizeof(buf), "0x%X\n", val); |
181 | |
182 | return simple_read_from_buffer(userbuf, count, ppos, buf, len); |
183 | } |
184 | |
185 | static ssize_t iio_debugfs_write_reg(struct file *file, |
186 | const char __user *userbuf, size_t count, loff_t *ppos) |
187 | { |
188 | struct iio_dev *indio_dev = file->private_data; |
189 | unsigned reg, val; |
190 | char buf[80]; |
191 | int ret; |
192 | |
193 | count = min_t(size_t, count, (sizeof(buf)-1)); |
194 | if (copy_from_user(buf, userbuf, count)) |
195 | return -EFAULT; |
196 | |
197 | buf[count] = 0; |
198 | |
199 | ret = sscanf(buf, "%i %i", ®, &val); |
200 | |
201 | switch (ret) { |
202 | case 1: |
203 | indio_dev->cached_reg_addr = reg; |
204 | break; |
205 | case 2: |
206 | indio_dev->cached_reg_addr = reg; |
207 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, |
208 | val, NULL); |
209 | if (ret) { |
210 | dev_err(indio_dev->dev.parent, "%s: write failed\n", |
211 | __func__); |
212 | return ret; |
213 | } |
214 | break; |
215 | default: |
216 | return -EINVAL; |
217 | } |
218 | |
219 | return count; |
220 | } |
221 | |
222 | static const struct file_operations iio_debugfs_reg_fops = { |
223 | .open = simple_open, |
224 | .read = iio_debugfs_read_reg, |
225 | .write = iio_debugfs_write_reg, |
226 | }; |
227 | |
228 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) |
229 | { |
230 | debugfs_remove_recursive(indio_dev->debugfs_dentry); |
231 | } |
232 | |
233 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
234 | { |
235 | struct dentry *d; |
236 | |
237 | if (indio_dev->info->debugfs_reg_access == NULL) |
238 | return 0; |
239 | |
240 | if (!iio_debugfs_dentry) |
241 | return 0; |
242 | |
243 | indio_dev->debugfs_dentry = |
244 | debugfs_create_dir(dev_name(&indio_dev->dev), |
245 | iio_debugfs_dentry); |
246 | if (indio_dev->debugfs_dentry == NULL) { |
247 | dev_warn(indio_dev->dev.parent, |
248 | "Failed to create debugfs directory\n"); |
249 | return -EFAULT; |
250 | } |
251 | |
252 | d = debugfs_create_file("direct_reg_access", 0644, |
253 | indio_dev->debugfs_dentry, |
254 | indio_dev, &iio_debugfs_reg_fops); |
255 | if (!d) { |
256 | iio_device_unregister_debugfs(indio_dev); |
257 | return -ENOMEM; |
258 | } |
259 | |
260 | return 0; |
261 | } |
262 | #else |
263 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
264 | { |
265 | return 0; |
266 | } |
267 | |
268 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) |
269 | { |
270 | } |
271 | #endif /* CONFIG_DEBUG_FS */ |
272 | |
273 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
274 | struct device_attribute *attr, |
275 | char *buf) |
276 | { |
277 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
278 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
279 | const struct iio_chan_spec_ext_info *ext_info; |
280 | |
281 | ext_info = &this_attr->c->ext_info[this_attr->address]; |
282 | |
283 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
284 | } |
285 | |
286 | static ssize_t iio_write_channel_ext_info(struct device *dev, |
287 | struct device_attribute *attr, |
288 | const char *buf, |
289 | size_t len) |
290 | { |
291 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
292 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
293 | const struct iio_chan_spec_ext_info *ext_info; |
294 | |
295 | ext_info = &this_attr->c->ext_info[this_attr->address]; |
296 | |
297 | return ext_info->write(indio_dev, ext_info->private, |
298 | this_attr->c, buf, len); |
299 | } |
300 | |
301 | ssize_t iio_enum_available_read(struct iio_dev *indio_dev, |
302 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) |
303 | { |
304 | const struct iio_enum *e = (const struct iio_enum *)priv; |
305 | unsigned int i; |
306 | size_t len = 0; |
307 | |
308 | if (!e->num_items) |
309 | return 0; |
310 | |
311 | for (i = 0; i < e->num_items; ++i) |
312 | len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); |
313 | |
314 | /* replace last space with a newline */ |
315 | buf[len - 1] = '\n'; |
316 | |
317 | return len; |
318 | } |
319 | EXPORT_SYMBOL_GPL(iio_enum_available_read); |
320 | |
321 | ssize_t iio_enum_read(struct iio_dev *indio_dev, |
322 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) |
323 | { |
324 | const struct iio_enum *e = (const struct iio_enum *)priv; |
325 | int i; |
326 | |
327 | if (!e->get) |
328 | return -EINVAL; |
329 | |
330 | i = e->get(indio_dev, chan); |
331 | if (i < 0) |
332 | return i; |
333 | else if (i >= e->num_items) |
334 | return -EINVAL; |
335 | |
336 | return sprintf(buf, "%s\n", e->items[i]); |
337 | } |
338 | EXPORT_SYMBOL_GPL(iio_enum_read); |
339 | |
340 | ssize_t iio_enum_write(struct iio_dev *indio_dev, |
341 | uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, |
342 | size_t len) |
343 | { |
344 | const struct iio_enum *e = (const struct iio_enum *)priv; |
345 | unsigned int i; |
346 | int ret; |
347 | |
348 | if (!e->set) |
349 | return -EINVAL; |
350 | |
351 | for (i = 0; i < e->num_items; i++) { |
352 | if (sysfs_streq(buf, e->items[i])) |
353 | break; |
354 | } |
355 | |
356 | if (i == e->num_items) |
357 | return -EINVAL; |
358 | |
359 | ret = e->set(indio_dev, chan, i); |
360 | return ret ? ret : len; |
361 | } |
362 | EXPORT_SYMBOL_GPL(iio_enum_write); |
363 | |
364 | static ssize_t iio_read_channel_info(struct device *dev, |
365 | struct device_attribute *attr, |
366 | char *buf) |
367 | { |
368 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
369 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
370 | unsigned long long tmp; |
371 | int val, val2; |
372 | bool scale_db = false; |
373 | int ret = indio_dev->info->read_raw(indio_dev, this_attr->c, |
374 | &val, &val2, this_attr->address); |
375 | |
376 | if (ret < 0) |
377 | return ret; |
378 | |
379 | switch (ret) { |
380 | case IIO_VAL_INT: |
381 | return sprintf(buf, "%d\n", val); |
382 | case IIO_VAL_INT_PLUS_MICRO_DB: |
383 | scale_db = true; |
384 | case IIO_VAL_INT_PLUS_MICRO: |
385 | if (val2 < 0) |
386 | return sprintf(buf, "-%d.%06u%s\n", val, -val2, |
387 | scale_db ? " dB" : ""); |
388 | else |
389 | return sprintf(buf, "%d.%06u%s\n", val, val2, |
390 | scale_db ? " dB" : ""); |
391 | case IIO_VAL_INT_PLUS_NANO: |
392 | if (val2 < 0) |
393 | return sprintf(buf, "-%d.%09u\n", val, -val2); |
394 | else |
395 | return sprintf(buf, "%d.%09u\n", val, val2); |
396 | case IIO_VAL_FRACTIONAL: |
397 | tmp = div_s64((s64)val * 1000000000LL, val2); |
398 | val2 = do_div(tmp, 1000000000LL); |
399 | val = tmp; |
400 | return sprintf(buf, "%d.%09u\n", val, val2); |
401 | case IIO_VAL_FRACTIONAL_LOG2: |
402 | tmp = (s64)val * 1000000000LL >> val2; |
403 | val2 = do_div(tmp, 1000000000LL); |
404 | val = tmp; |
405 | return sprintf(buf, "%d.%09u\n", val, val2); |
406 | default: |
407 | return 0; |
408 | } |
409 | } |
410 | |
411 | /** |
412 | * iio_str_to_fixpoint() - Parse a fixed-point number from a string |
413 | * @str: The string to parse |
414 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 |
415 | * @integer: The integer part of the number |
416 | * @fract: The fractional part of the number |
417 | * |
418 | * Returns 0 on success, or a negative error code if the string could not be |
419 | * parsed. |
420 | */ |
421 | int iio_str_to_fixpoint(const char *str, int fract_mult, |
422 | int *integer, int *fract) |
423 | { |
424 | int i = 0, f = 0; |
425 | bool integer_part = true, negative = false; |
426 | |
427 | if (str[0] == '-') { |
428 | negative = true; |
429 | str++; |
430 | } else if (str[0] == '+') { |
431 | str++; |
432 | } |
433 | |
434 | while (*str) { |
435 | if ('0' <= *str && *str <= '9') { |
436 | if (integer_part) { |
437 | i = i * 10 + *str - '0'; |
438 | } else { |
439 | f += fract_mult * (*str - '0'); |
440 | fract_mult /= 10; |
441 | } |
442 | } else if (*str == '\n') { |
443 | if (*(str + 1) == '\0') |
444 | break; |
445 | else |
446 | return -EINVAL; |
447 | } else if (*str == '.' && integer_part) { |
448 | integer_part = false; |
449 | } else { |
450 | return -EINVAL; |
451 | } |
452 | str++; |
453 | } |
454 | |
455 | if (negative) { |
456 | if (i) |
457 | i = -i; |
458 | else |
459 | f = -f; |
460 | } |
461 | |
462 | *integer = i; |
463 | *fract = f; |
464 | |
465 | return 0; |
466 | } |
467 | EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); |
468 | |
469 | static ssize_t iio_write_channel_info(struct device *dev, |
470 | struct device_attribute *attr, |
471 | const char *buf, |
472 | size_t len) |
473 | { |
474 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
475 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
476 | int ret, fract_mult = 100000; |
477 | int integer, fract; |
478 | |
479 | /* Assumes decimal - precision based on number of digits */ |
480 | if (!indio_dev->info->write_raw) |
481 | return -EINVAL; |
482 | |
483 | if (indio_dev->info->write_raw_get_fmt) |
484 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, |
485 | this_attr->c, this_attr->address)) { |
486 | case IIO_VAL_INT_PLUS_MICRO: |
487 | fract_mult = 100000; |
488 | break; |
489 | case IIO_VAL_INT_PLUS_NANO: |
490 | fract_mult = 100000000; |
491 | break; |
492 | default: |
493 | return -EINVAL; |
494 | } |
495 | |
496 | ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract); |
497 | if (ret) |
498 | return ret; |
499 | |
500 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
501 | integer, fract, this_attr->address); |
502 | if (ret) |
503 | return ret; |
504 | |
505 | return len; |
506 | } |
507 | |
508 | static |
509 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
510 | const char *postfix, |
511 | struct iio_chan_spec const *chan, |
512 | ssize_t (*readfunc)(struct device *dev, |
513 | struct device_attribute *attr, |
514 | char *buf), |
515 | ssize_t (*writefunc)(struct device *dev, |
516 | struct device_attribute *attr, |
517 | const char *buf, |
518 | size_t len), |
519 | bool generic) |
520 | { |
521 | int ret; |
522 | char *name_format, *full_postfix; |
523 | sysfs_attr_init(&dev_attr->attr); |
524 | |
525 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
526 | if (chan->modified && !generic) { |
527 | if (chan->extend_name) |
528 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", |
529 | iio_modifier_names[chan |
530 | ->channel2], |
531 | chan->extend_name, |
532 | postfix); |
533 | else |
534 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", |
535 | iio_modifier_names[chan |
536 | ->channel2], |
537 | postfix); |
538 | } else { |
539 | if (chan->extend_name == NULL) |
540 | full_postfix = kstrdup(postfix, GFP_KERNEL); |
541 | else |
542 | full_postfix = kasprintf(GFP_KERNEL, |
543 | "%s_%s", |
544 | chan->extend_name, |
545 | postfix); |
546 | } |
547 | if (full_postfix == NULL) { |
548 | ret = -ENOMEM; |
549 | goto error_ret; |
550 | } |
551 | |
552 | if (chan->differential) { /* Differential can not have modifier */ |
553 | if (generic) |
554 | name_format |
555 | = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", |
556 | iio_direction[chan->output], |
557 | iio_chan_type_name_spec[chan->type], |
558 | iio_chan_type_name_spec[chan->type], |
559 | full_postfix); |
560 | else if (chan->indexed) |
561 | name_format |
562 | = kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s", |
563 | iio_direction[chan->output], |
564 | iio_chan_type_name_spec[chan->type], |
565 | chan->channel, |
566 | iio_chan_type_name_spec[chan->type], |
567 | chan->channel2, |
568 | full_postfix); |
569 | else { |
570 | WARN_ON("Differential channels must be indexed\n"); |
571 | ret = -EINVAL; |
572 | goto error_free_full_postfix; |
573 | } |
574 | } else { /* Single ended */ |
575 | if (generic) |
576 | name_format |
577 | = kasprintf(GFP_KERNEL, "%s_%s_%s", |
578 | iio_direction[chan->output], |
579 | iio_chan_type_name_spec[chan->type], |
580 | full_postfix); |
581 | else if (chan->indexed) |
582 | name_format |
583 | = kasprintf(GFP_KERNEL, "%s_%s%d_%s", |
584 | iio_direction[chan->output], |
585 | iio_chan_type_name_spec[chan->type], |
586 | chan->channel, |
587 | full_postfix); |
588 | else |
589 | name_format |
590 | = kasprintf(GFP_KERNEL, "%s_%s_%s", |
591 | iio_direction[chan->output], |
592 | iio_chan_type_name_spec[chan->type], |
593 | full_postfix); |
594 | } |
595 | if (name_format == NULL) { |
596 | ret = -ENOMEM; |
597 | goto error_free_full_postfix; |
598 | } |
599 | dev_attr->attr.name = kasprintf(GFP_KERNEL, |
600 | name_format, |
601 | chan->channel, |
602 | chan->channel2); |
603 | if (dev_attr->attr.name == NULL) { |
604 | ret = -ENOMEM; |
605 | goto error_free_name_format; |
606 | } |
607 | |
608 | if (readfunc) { |
609 | dev_attr->attr.mode |= S_IRUGO; |
610 | dev_attr->show = readfunc; |
611 | } |
612 | |
613 | if (writefunc) { |
614 | dev_attr->attr.mode |= S_IWUSR; |
615 | dev_attr->store = writefunc; |
616 | } |
617 | kfree(name_format); |
618 | kfree(full_postfix); |
619 | |
620 | return 0; |
621 | |
622 | error_free_name_format: |
623 | kfree(name_format); |
624 | error_free_full_postfix: |
625 | kfree(full_postfix); |
626 | error_ret: |
627 | return ret; |
628 | } |
629 | |
630 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
631 | { |
632 | kfree(dev_attr->attr.name); |
633 | } |
634 | |
635 | int __iio_add_chan_devattr(const char *postfix, |
636 | struct iio_chan_spec const *chan, |
637 | ssize_t (*readfunc)(struct device *dev, |
638 | struct device_attribute *attr, |
639 | char *buf), |
640 | ssize_t (*writefunc)(struct device *dev, |
641 | struct device_attribute *attr, |
642 | const char *buf, |
643 | size_t len), |
644 | u64 mask, |
645 | bool generic, |
646 | struct device *dev, |
647 | struct list_head *attr_list) |
648 | { |
649 | int ret; |
650 | struct iio_dev_attr *iio_attr, *t; |
651 | |
652 | iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL); |
653 | if (iio_attr == NULL) { |
654 | ret = -ENOMEM; |
655 | goto error_ret; |
656 | } |
657 | ret = __iio_device_attr_init(&iio_attr->dev_attr, |
658 | postfix, chan, |
659 | readfunc, writefunc, generic); |
660 | if (ret) |
661 | goto error_iio_dev_attr_free; |
662 | iio_attr->c = chan; |
663 | iio_attr->address = mask; |
664 | list_for_each_entry(t, attr_list, l) |
665 | if (strcmp(t->dev_attr.attr.name, |
666 | iio_attr->dev_attr.attr.name) == 0) { |
667 | if (!generic) |
668 | dev_err(dev, "tried to double register : %s\n", |
669 | t->dev_attr.attr.name); |
670 | ret = -EBUSY; |
671 | goto error_device_attr_deinit; |
672 | } |
673 | list_add(&iio_attr->l, attr_list); |
674 | |
675 | return 0; |
676 | |
677 | error_device_attr_deinit: |
678 | __iio_device_attr_deinit(&iio_attr->dev_attr); |
679 | error_iio_dev_attr_free: |
680 | kfree(iio_attr); |
681 | error_ret: |
682 | return ret; |
683 | } |
684 | |
685 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, |
686 | struct iio_chan_spec const *chan) |
687 | { |
688 | int ret, attrcount = 0; |
689 | int i; |
690 | const struct iio_chan_spec_ext_info *ext_info; |
691 | |
692 | if (chan->channel < 0) |
693 | return 0; |
694 | for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) { |
695 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2], |
696 | chan, |
697 | &iio_read_channel_info, |
698 | &iio_write_channel_info, |
699 | i/2, |
700 | !(i%2), |
701 | &indio_dev->dev, |
702 | &indio_dev->channel_attr_list); |
703 | if (ret == -EBUSY && (i%2 == 0)) { |
704 | ret = 0; |
705 | continue; |
706 | } |
707 | if (ret < 0) |
708 | goto error_ret; |
709 | attrcount++; |
710 | } |
711 | |
712 | if (chan->ext_info) { |
713 | unsigned int i = 0; |
714 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { |
715 | ret = __iio_add_chan_devattr(ext_info->name, |
716 | chan, |
717 | ext_info->read ? |
718 | &iio_read_channel_ext_info : NULL, |
719 | ext_info->write ? |
720 | &iio_write_channel_ext_info : NULL, |
721 | i, |
722 | ext_info->shared, |
723 | &indio_dev->dev, |
724 | &indio_dev->channel_attr_list); |
725 | i++; |
726 | if (ret == -EBUSY && ext_info->shared) |
727 | continue; |
728 | |
729 | if (ret) |
730 | goto error_ret; |
731 | |
732 | attrcount++; |
733 | } |
734 | } |
735 | |
736 | ret = attrcount; |
737 | error_ret: |
738 | return ret; |
739 | } |
740 | |
741 | static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev, |
742 | struct iio_dev_attr *p) |
743 | { |
744 | kfree(p->dev_attr.attr.name); |
745 | kfree(p); |
746 | } |
747 | |
748 | static ssize_t iio_show_dev_name(struct device *dev, |
749 | struct device_attribute *attr, |
750 | char *buf) |
751 | { |
752 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
753 | return sprintf(buf, "%s\n", indio_dev->name); |
754 | } |
755 | |
756 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); |
757 | |
758 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
759 | { |
760 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
761 | struct iio_dev_attr *p, *n; |
762 | struct attribute **attr; |
763 | |
764 | /* First count elements in any existing group */ |
765 | if (indio_dev->info->attrs) { |
766 | attr = indio_dev->info->attrs->attrs; |
767 | while (*attr++ != NULL) |
768 | attrcount_orig++; |
769 | } |
770 | attrcount = attrcount_orig; |
771 | /* |
772 | * New channel registration method - relies on the fact a group does |
773 | * not need to be initialized if its name is NULL. |
774 | */ |
775 | if (indio_dev->channels) |
776 | for (i = 0; i < indio_dev->num_channels; i++) { |
777 | ret = iio_device_add_channel_sysfs(indio_dev, |
778 | &indio_dev |
779 | ->channels[i]); |
780 | if (ret < 0) |
781 | goto error_clear_attrs; |
782 | attrcount += ret; |
783 | } |
784 | |
785 | if (indio_dev->name) |
786 | attrcount++; |
787 | |
788 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
789 | sizeof(indio_dev->chan_attr_group.attrs[0]), |
790 | GFP_KERNEL); |
791 | if (indio_dev->chan_attr_group.attrs == NULL) { |
792 | ret = -ENOMEM; |
793 | goto error_clear_attrs; |
794 | } |
795 | /* Copy across original attributes */ |
796 | if (indio_dev->info->attrs) |
797 | memcpy(indio_dev->chan_attr_group.attrs, |
798 | indio_dev->info->attrs->attrs, |
799 | sizeof(indio_dev->chan_attr_group.attrs[0]) |
800 | *attrcount_orig); |
801 | attrn = attrcount_orig; |
802 | /* Add all elements from the list. */ |
803 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
804 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; |
805 | if (indio_dev->name) |
806 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; |
807 | |
808 | indio_dev->groups[indio_dev->groupcounter++] = |
809 | &indio_dev->chan_attr_group; |
810 | |
811 | return 0; |
812 | |
813 | error_clear_attrs: |
814 | list_for_each_entry_safe(p, n, |
815 | &indio_dev->channel_attr_list, l) { |
816 | list_del(&p->l); |
817 | iio_device_remove_and_free_read_attr(indio_dev, p); |
818 | } |
819 | |
820 | return ret; |
821 | } |
822 | |
823 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
824 | { |
825 | |
826 | struct iio_dev_attr *p, *n; |
827 | |
828 | list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) { |
829 | list_del(&p->l); |
830 | iio_device_remove_and_free_read_attr(indio_dev, p); |
831 | } |
832 | kfree(indio_dev->chan_attr_group.attrs); |
833 | } |
834 | |
835 | static void iio_dev_release(struct device *device) |
836 | { |
837 | struct iio_dev *indio_dev = dev_to_iio_dev(device); |
838 | if (indio_dev->chrdev.dev) |
839 | cdev_del(&indio_dev->chrdev); |
840 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
841 | iio_device_unregister_trigger_consumer(indio_dev); |
842 | iio_device_unregister_eventset(indio_dev); |
843 | iio_device_unregister_sysfs(indio_dev); |
844 | iio_device_unregister_debugfs(indio_dev); |
845 | |
846 | ida_simple_remove(&iio_ida, indio_dev->id); |
847 | kfree(indio_dev); |
848 | } |
849 | |
850 | static struct device_type iio_dev_type = { |
851 | .name = "iio_device", |
852 | .release = iio_dev_release, |
853 | }; |
854 | |
855 | struct iio_dev *iio_device_alloc(int sizeof_priv) |
856 | { |
857 | struct iio_dev *dev; |
858 | size_t alloc_size; |
859 | |
860 | alloc_size = sizeof(struct iio_dev); |
861 | if (sizeof_priv) { |
862 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); |
863 | alloc_size += sizeof_priv; |
864 | } |
865 | /* ensure 32-byte alignment of whole construct ? */ |
866 | alloc_size += IIO_ALIGN - 1; |
867 | |
868 | dev = kzalloc(alloc_size, GFP_KERNEL); |
869 | |
870 | if (dev) { |
871 | dev->dev.groups = dev->groups; |
872 | dev->dev.type = &iio_dev_type; |
873 | dev->dev.bus = &iio_bus_type; |
874 | device_initialize(&dev->dev); |
875 | dev_set_drvdata(&dev->dev, (void *)dev); |
876 | mutex_init(&dev->mlock); |
877 | mutex_init(&dev->info_exist_lock); |
878 | INIT_LIST_HEAD(&dev->channel_attr_list); |
879 | |
880 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); |
881 | if (dev->id < 0) { |
882 | /* cannot use a dev_err as the name isn't available */ |
883 | printk(KERN_ERR "Failed to get id\n"); |
884 | kfree(dev); |
885 | return NULL; |
886 | } |
887 | dev_set_name(&dev->dev, "iio:device%d", dev->id); |
888 | INIT_LIST_HEAD(&dev->buffer_list); |
889 | } |
890 | |
891 | return dev; |
892 | } |
893 | EXPORT_SYMBOL(iio_device_alloc); |
894 | |
895 | void iio_device_free(struct iio_dev *dev) |
896 | { |
897 | if (dev) |
898 | put_device(&dev->dev); |
899 | } |
900 | EXPORT_SYMBOL(iio_device_free); |
901 | |
902 | /** |
903 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
904 | **/ |
905 | static int iio_chrdev_open(struct inode *inode, struct file *filp) |
906 | { |
907 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
908 | struct iio_dev, chrdev); |
909 | |
910 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) |
911 | return -EBUSY; |
912 | |
913 | filp->private_data = indio_dev; |
914 | |
915 | return 0; |
916 | } |
917 | |
918 | /** |
919 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
920 | **/ |
921 | static int iio_chrdev_release(struct inode *inode, struct file *filp) |
922 | { |
923 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
924 | struct iio_dev, chrdev); |
925 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
926 | return 0; |
927 | } |
928 | |
929 | /* Somewhat of a cross file organization violation - ioctls here are actually |
930 | * event related */ |
931 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
932 | { |
933 | struct iio_dev *indio_dev = filp->private_data; |
934 | int __user *ip = (int __user *)arg; |
935 | int fd; |
936 | |
937 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { |
938 | fd = iio_event_getfd(indio_dev); |
939 | if (copy_to_user(ip, &fd, sizeof(fd))) |
940 | return -EFAULT; |
941 | return 0; |
942 | } |
943 | return -EINVAL; |
944 | } |
945 | |
946 | static const struct file_operations iio_buffer_fileops = { |
947 | .read = iio_buffer_read_first_n_outer_addr, |
948 | .release = iio_chrdev_release, |
949 | .open = iio_chrdev_open, |
950 | .poll = iio_buffer_poll_addr, |
951 | .owner = THIS_MODULE, |
952 | .llseek = noop_llseek, |
953 | .unlocked_ioctl = iio_ioctl, |
954 | .compat_ioctl = iio_ioctl, |
955 | }; |
956 | |
957 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
958 | |
959 | int iio_device_register(struct iio_dev *indio_dev) |
960 | { |
961 | int ret; |
962 | |
963 | /* configure elements for the chrdev */ |
964 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
965 | |
966 | ret = iio_device_register_debugfs(indio_dev); |
967 | if (ret) { |
968 | dev_err(indio_dev->dev.parent, |
969 | "Failed to register debugfs interfaces\n"); |
970 | goto error_ret; |
971 | } |
972 | ret = iio_device_register_sysfs(indio_dev); |
973 | if (ret) { |
974 | dev_err(indio_dev->dev.parent, |
975 | "Failed to register sysfs interfaces\n"); |
976 | goto error_unreg_debugfs; |
977 | } |
978 | ret = iio_device_register_eventset(indio_dev); |
979 | if (ret) { |
980 | dev_err(indio_dev->dev.parent, |
981 | "Failed to register event set\n"); |
982 | goto error_free_sysfs; |
983 | } |
984 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
985 | iio_device_register_trigger_consumer(indio_dev); |
986 | |
987 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
988 | indio_dev->setup_ops == NULL) |
989 | indio_dev->setup_ops = &noop_ring_setup_ops; |
990 | |
991 | ret = device_add(&indio_dev->dev); |
992 | if (ret < 0) |
993 | goto error_unreg_eventset; |
994 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
995 | indio_dev->chrdev.owner = indio_dev->info->driver_module; |
996 | ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); |
997 | if (ret < 0) |
998 | goto error_del_device; |
999 | return 0; |
1000 | |
1001 | error_del_device: |
1002 | device_del(&indio_dev->dev); |
1003 | error_unreg_eventset: |
1004 | iio_device_unregister_eventset(indio_dev); |
1005 | error_free_sysfs: |
1006 | iio_device_unregister_sysfs(indio_dev); |
1007 | error_unreg_debugfs: |
1008 | iio_device_unregister_debugfs(indio_dev); |
1009 | error_ret: |
1010 | return ret; |
1011 | } |
1012 | EXPORT_SYMBOL(iio_device_register); |
1013 | |
1014 | void iio_device_unregister(struct iio_dev *indio_dev) |
1015 | { |
1016 | mutex_lock(&indio_dev->info_exist_lock); |
1017 | indio_dev->info = NULL; |
1018 | mutex_unlock(&indio_dev->info_exist_lock); |
1019 | device_del(&indio_dev->dev); |
1020 | } |
1021 | EXPORT_SYMBOL(iio_device_unregister); |
1022 | subsys_initcall(iio_init); |
1023 | module_exit(iio_exit); |
1024 | |
1025 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
1026 | MODULE_DESCRIPTION("Industrial I/O core"); |
1027 | MODULE_LICENSE("GPL"); |
1028 |
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Tags:
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v2.6.34-rc5
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