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", |
21cd1fab | 67 | [IIO_CCT] = "cct", |
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", | |
8f5879b2 | 74 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", |
cf82cb81 | 75 | [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", |
330c6c57 JC |
76 | [IIO_MOD_LIGHT_BOTH] = "both", |
77 | [IIO_MOD_LIGHT_IR] = "ir", | |
21cd1fab JB |
78 | [IIO_MOD_LIGHT_CLEAR] = "clear", |
79 | [IIO_MOD_LIGHT_RED] = "red", | |
80 | [IIO_MOD_LIGHT_GREEN] = "green", | |
81 | [IIO_MOD_LIGHT_BLUE] = "blue", | |
1d892719 JC |
82 | }; |
83 | ||
84 | /* relies on pairs of these shared then separate */ | |
85 | static const char * const iio_chan_info_postfix[] = { | |
75a973c7 JC |
86 | [IIO_CHAN_INFO_RAW] = "raw", |
87 | [IIO_CHAN_INFO_PROCESSED] = "input", | |
c8a9f805 JC |
88 | [IIO_CHAN_INFO_SCALE] = "scale", |
89 | [IIO_CHAN_INFO_OFFSET] = "offset", | |
90 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", | |
91 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", | |
92 | [IIO_CHAN_INFO_PEAK] = "peak_raw", | |
93 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", | |
94 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", | |
95 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", | |
df94aba8 JC |
96 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
97 | = "filter_low_pass_3db_frequency", | |
ce85a1cb | 98 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", |
a6b12855 MH |
99 | [IIO_CHAN_INFO_FREQUENCY] = "frequency", |
100 | [IIO_CHAN_INFO_PHASE] = "phase", | |
b65d6212 | 101 | [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", |
1d892719 JC |
102 | }; |
103 | ||
5fb21c82 JC |
104 | const struct iio_chan_spec |
105 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) | |
106 | { | |
107 | int i; | |
108 | ||
109 | for (i = 0; i < indio_dev->num_channels; i++) | |
110 | if (indio_dev->channels[i].scan_index == si) | |
111 | return &indio_dev->channels[i]; | |
112 | return NULL; | |
113 | } | |
114 | ||
847ec80b JC |
115 | /* This turns up an awful lot */ |
116 | ssize_t iio_read_const_attr(struct device *dev, | |
117 | struct device_attribute *attr, | |
118 | char *buf) | |
119 | { | |
120 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
121 | } | |
122 | EXPORT_SYMBOL(iio_read_const_attr); | |
123 | ||
847ec80b JC |
124 | static int __init iio_init(void) |
125 | { | |
126 | int ret; | |
127 | ||
5aaaeba8 JC |
128 | /* Register sysfs bus */ |
129 | ret = bus_register(&iio_bus_type); | |
847ec80b JC |
130 | if (ret < 0) { |
131 | printk(KERN_ERR | |
5aaaeba8 | 132 | "%s could not register bus type\n", |
847ec80b JC |
133 | __FILE__); |
134 | goto error_nothing; | |
135 | } | |
136 | ||
9aa1a167 JC |
137 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
138 | if (ret < 0) { | |
139 | printk(KERN_ERR "%s: failed to allocate char dev region\n", | |
140 | __FILE__); | |
5aaaeba8 | 141 | goto error_unregister_bus_type; |
9aa1a167 | 142 | } |
847ec80b | 143 | |
e553f182 MH |
144 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
145 | ||
847ec80b JC |
146 | return 0; |
147 | ||
5aaaeba8 JC |
148 | error_unregister_bus_type: |
149 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
150 | error_nothing: |
151 | return ret; | |
152 | } | |
153 | ||
154 | static void __exit iio_exit(void) | |
155 | { | |
9aa1a167 JC |
156 | if (iio_devt) |
157 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 158 | bus_unregister(&iio_bus_type); |
e553f182 MH |
159 | debugfs_remove(iio_debugfs_dentry); |
160 | } | |
161 | ||
162 | #if defined(CONFIG_DEBUG_FS) | |
e553f182 MH |
163 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
164 | size_t count, loff_t *ppos) | |
165 | { | |
166 | struct iio_dev *indio_dev = file->private_data; | |
167 | char buf[20]; | |
168 | unsigned val = 0; | |
169 | ssize_t len; | |
170 | int ret; | |
171 | ||
172 | ret = indio_dev->info->debugfs_reg_access(indio_dev, | |
173 | indio_dev->cached_reg_addr, | |
174 | 0, &val); | |
175 | if (ret) | |
176 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); | |
177 | ||
178 | len = snprintf(buf, sizeof(buf), "0x%X\n", val); | |
179 | ||
180 | return simple_read_from_buffer(userbuf, count, ppos, buf, len); | |
181 | } | |
182 | ||
183 | static ssize_t iio_debugfs_write_reg(struct file *file, | |
184 | const char __user *userbuf, size_t count, loff_t *ppos) | |
185 | { | |
186 | struct iio_dev *indio_dev = file->private_data; | |
187 | unsigned reg, val; | |
188 | char buf[80]; | |
189 | int ret; | |
190 | ||
191 | count = min_t(size_t, count, (sizeof(buf)-1)); | |
192 | if (copy_from_user(buf, userbuf, count)) | |
193 | return -EFAULT; | |
194 | ||
195 | buf[count] = 0; | |
196 | ||
197 | ret = sscanf(buf, "%i %i", ®, &val); | |
198 | ||
199 | switch (ret) { | |
200 | case 1: | |
201 | indio_dev->cached_reg_addr = reg; | |
202 | break; | |
203 | case 2: | |
204 | indio_dev->cached_reg_addr = reg; | |
205 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, | |
206 | val, NULL); | |
207 | if (ret) { | |
208 | dev_err(indio_dev->dev.parent, "%s: write failed\n", | |
209 | __func__); | |
210 | return ret; | |
211 | } | |
212 | break; | |
213 | default: | |
214 | return -EINVAL; | |
215 | } | |
216 | ||
217 | return count; | |
218 | } | |
219 | ||
220 | static const struct file_operations iio_debugfs_reg_fops = { | |
5a28c873 | 221 | .open = simple_open, |
e553f182 MH |
222 | .read = iio_debugfs_read_reg, |
223 | .write = iio_debugfs_write_reg, | |
224 | }; | |
225 | ||
226 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
227 | { | |
228 | debugfs_remove_recursive(indio_dev->debugfs_dentry); | |
847ec80b JC |
229 | } |
230 | ||
e553f182 MH |
231 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
232 | { | |
233 | struct dentry *d; | |
234 | ||
235 | if (indio_dev->info->debugfs_reg_access == NULL) | |
236 | return 0; | |
237 | ||
abd5a2fb | 238 | if (!iio_debugfs_dentry) |
e553f182 MH |
239 | return 0; |
240 | ||
241 | indio_dev->debugfs_dentry = | |
242 | debugfs_create_dir(dev_name(&indio_dev->dev), | |
243 | iio_debugfs_dentry); | |
e553f182 MH |
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 | { | |
e53f5ac5 | 275 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
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 | ||
fc6d1139 | 281 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
4fee7e16 LPC |
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 | { | |
e53f5ac5 | 289 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
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 | ||
fc6d1139 MH |
295 | return ext_info->write(indio_dev, ext_info->private, |
296 | this_attr->c, buf, len); | |
4fee7e16 LPC |
297 | } |
298 | ||
5212cc8a LPC |
299 | ssize_t iio_enum_available_read(struct iio_dev *indio_dev, |
300 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
301 | { | |
302 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
303 | unsigned int i; | |
304 | size_t len = 0; | |
305 | ||
306 | if (!e->num_items) | |
307 | return 0; | |
308 | ||
309 | for (i = 0; i < e->num_items; ++i) | |
74dcd439 | 310 | len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); |
5212cc8a LPC |
311 | |
312 | /* replace last space with a newline */ | |
313 | buf[len - 1] = '\n'; | |
314 | ||
315 | return len; | |
316 | } | |
317 | EXPORT_SYMBOL_GPL(iio_enum_available_read); | |
318 | ||
319 | ssize_t iio_enum_read(struct iio_dev *indio_dev, | |
320 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
321 | { | |
322 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
323 | int i; | |
324 | ||
325 | if (!e->get) | |
326 | return -EINVAL; | |
327 | ||
328 | i = e->get(indio_dev, chan); | |
329 | if (i < 0) | |
330 | return i; | |
331 | else if (i >= e->num_items) | |
332 | return -EINVAL; | |
333 | ||
334 | return sprintf(buf, "%s\n", e->items[i]); | |
335 | } | |
336 | EXPORT_SYMBOL_GPL(iio_enum_read); | |
337 | ||
338 | ssize_t iio_enum_write(struct iio_dev *indio_dev, | |
339 | uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, | |
340 | size_t len) | |
341 | { | |
342 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
343 | unsigned int i; | |
344 | int ret; | |
345 | ||
346 | if (!e->set) | |
347 | return -EINVAL; | |
348 | ||
349 | for (i = 0; i < e->num_items; i++) { | |
350 | if (sysfs_streq(buf, e->items[i])) | |
351 | break; | |
352 | } | |
353 | ||
354 | if (i == e->num_items) | |
355 | return -EINVAL; | |
356 | ||
357 | ret = e->set(indio_dev, chan, i); | |
358 | return ret ? ret : len; | |
359 | } | |
360 | EXPORT_SYMBOL_GPL(iio_enum_write); | |
361 | ||
1d892719 JC |
362 | static ssize_t iio_read_channel_info(struct device *dev, |
363 | struct device_attribute *attr, | |
364 | char *buf) | |
847ec80b | 365 | { |
e53f5ac5 | 366 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719 JC |
367 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
368 | int val, val2; | |
67eedba3 | 369 | bool scale_db = false; |
6fe8135f JC |
370 | int ret = indio_dev->info->read_raw(indio_dev, this_attr->c, |
371 | &val, &val2, this_attr->address); | |
1d892719 JC |
372 | |
373 | if (ret < 0) | |
374 | return ret; | |
847ec80b | 375 | |
67eedba3 MH |
376 | switch (ret) { |
377 | case IIO_VAL_INT: | |
1d892719 | 378 | return sprintf(buf, "%d\n", val); |
67eedba3 MH |
379 | case IIO_VAL_INT_PLUS_MICRO_DB: |
380 | scale_db = true; | |
381 | case IIO_VAL_INT_PLUS_MICRO: | |
1d892719 | 382 | if (val2 < 0) |
67eedba3 MH |
383 | return sprintf(buf, "-%d.%06u%s\n", val, -val2, |
384 | scale_db ? " dB" : ""); | |
1d892719 | 385 | else |
67eedba3 MH |
386 | return sprintf(buf, "%d.%06u%s\n", val, val2, |
387 | scale_db ? " dB" : ""); | |
388 | case IIO_VAL_INT_PLUS_NANO: | |
71646e2c MH |
389 | if (val2 < 0) |
390 | return sprintf(buf, "-%d.%09u\n", val, -val2); | |
391 | else | |
392 | return sprintf(buf, "%d.%09u\n", val, val2); | |
67eedba3 | 393 | default: |
1d892719 | 394 | return 0; |
67eedba3 | 395 | } |
1d892719 JC |
396 | } |
397 | ||
398 | static ssize_t iio_write_channel_info(struct device *dev, | |
399 | struct device_attribute *attr, | |
400 | const char *buf, | |
401 | size_t len) | |
402 | { | |
e53f5ac5 | 403 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719 | 404 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
5c04af04 | 405 | int ret, integer = 0, fract = 0, fract_mult = 100000; |
1d892719 JC |
406 | bool integer_part = true, negative = false; |
407 | ||
408 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 409 | if (!indio_dev->info->write_raw) |
1d892719 | 410 | return -EINVAL; |
5c04af04 MH |
411 | |
412 | if (indio_dev->info->write_raw_get_fmt) | |
413 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, | |
414 | this_attr->c, this_attr->address)) { | |
415 | case IIO_VAL_INT_PLUS_MICRO: | |
416 | fract_mult = 100000; | |
417 | break; | |
418 | case IIO_VAL_INT_PLUS_NANO: | |
419 | fract_mult = 100000000; | |
420 | break; | |
421 | default: | |
422 | return -EINVAL; | |
423 | } | |
424 | ||
1d892719 JC |
425 | if (buf[0] == '-') { |
426 | negative = true; | |
427 | buf++; | |
428 | } | |
5c04af04 | 429 | |
1d892719 JC |
430 | while (*buf) { |
431 | if ('0' <= *buf && *buf <= '9') { | |
432 | if (integer_part) | |
433 | integer = integer*10 + *buf - '0'; | |
434 | else { | |
5c04af04 MH |
435 | fract += fract_mult*(*buf - '0'); |
436 | if (fract_mult == 1) | |
1d892719 | 437 | break; |
5c04af04 | 438 | fract_mult /= 10; |
1d892719 JC |
439 | } |
440 | } else if (*buf == '\n') { | |
441 | if (*(buf + 1) == '\0') | |
442 | break; | |
443 | else | |
444 | return -EINVAL; | |
445 | } else if (*buf == '.') { | |
446 | integer_part = false; | |
447 | } else { | |
448 | return -EINVAL; | |
449 | } | |
450 | buf++; | |
451 | } | |
452 | if (negative) { | |
453 | if (integer) | |
454 | integer = -integer; | |
455 | else | |
5c04af04 | 456 | fract = -fract; |
1d892719 JC |
457 | } |
458 | ||
6fe8135f | 459 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 460 | integer, fract, this_attr->address); |
1d892719 JC |
461 | if (ret) |
462 | return ret; | |
463 | ||
464 | return len; | |
465 | } | |
466 | ||
df9c1c42 | 467 | static |
1d892719 JC |
468 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
469 | const char *postfix, | |
470 | struct iio_chan_spec const *chan, | |
471 | ssize_t (*readfunc)(struct device *dev, | |
472 | struct device_attribute *attr, | |
473 | char *buf), | |
474 | ssize_t (*writefunc)(struct device *dev, | |
475 | struct device_attribute *attr, | |
476 | const char *buf, | |
477 | size_t len), | |
478 | bool generic) | |
479 | { | |
480 | int ret; | |
481 | char *name_format, *full_postfix; | |
482 | sysfs_attr_init(&dev_attr->attr); | |
1d892719 | 483 | |
ade7ef7b | 484 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
0403e0d6 | 485 | if (chan->modified && !generic) { |
ade7ef7b JC |
486 | if (chan->extend_name) |
487 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
488 | iio_modifier_names[chan | |
489 | ->channel2], | |
490 | chan->extend_name, | |
491 | postfix); | |
492 | else | |
493 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
494 | iio_modifier_names[chan | |
495 | ->channel2], | |
496 | postfix); | |
497 | } else { | |
498 | if (chan->extend_name == NULL) | |
499 | full_postfix = kstrdup(postfix, GFP_KERNEL); | |
500 | else | |
501 | full_postfix = kasprintf(GFP_KERNEL, | |
502 | "%s_%s", | |
503 | chan->extend_name, | |
504 | postfix); | |
505 | } | |
506 | if (full_postfix == NULL) { | |
507 | ret = -ENOMEM; | |
508 | goto error_ret; | |
509 | } | |
1d892719 | 510 | |
4abf6f8b | 511 | if (chan->differential) { /* Differential can not have modifier */ |
ade7ef7b JC |
512 | if (generic) |
513 | name_format | |
514 | = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", | |
515 | iio_direction[chan->output], | |
516 | iio_chan_type_name_spec[chan->type], | |
517 | iio_chan_type_name_spec[chan->type], | |
518 | full_postfix); | |
519 | else if (chan->indexed) | |
520 | name_format | |
521 | = kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s", | |
522 | iio_direction[chan->output], | |
523 | iio_chan_type_name_spec[chan->type], | |
524 | chan->channel, | |
525 | iio_chan_type_name_spec[chan->type], | |
526 | chan->channel2, | |
527 | full_postfix); | |
528 | else { | |
529 | WARN_ON("Differential channels must be indexed\n"); | |
530 | ret = -EINVAL; | |
531 | goto error_free_full_postfix; | |
532 | } | |
533 | } else { /* Single ended */ | |
534 | if (generic) | |
535 | name_format | |
536 | = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
537 | iio_direction[chan->output], | |
538 | iio_chan_type_name_spec[chan->type], | |
539 | full_postfix); | |
540 | else if (chan->indexed) | |
541 | name_format | |
542 | = kasprintf(GFP_KERNEL, "%s_%s%d_%s", | |
543 | iio_direction[chan->output], | |
544 | iio_chan_type_name_spec[chan->type], | |
545 | chan->channel, | |
546 | full_postfix); | |
547 | else | |
548 | name_format | |
549 | = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
550 | iio_direction[chan->output], | |
551 | iio_chan_type_name_spec[chan->type], | |
552 | full_postfix); | |
553 | } | |
1d892719 JC |
554 | if (name_format == NULL) { |
555 | ret = -ENOMEM; | |
556 | goto error_free_full_postfix; | |
557 | } | |
558 | dev_attr->attr.name = kasprintf(GFP_KERNEL, | |
559 | name_format, | |
560 | chan->channel, | |
561 | chan->channel2); | |
562 | if (dev_attr->attr.name == NULL) { | |
563 | ret = -ENOMEM; | |
564 | goto error_free_name_format; | |
565 | } | |
566 | ||
567 | if (readfunc) { | |
568 | dev_attr->attr.mode |= S_IRUGO; | |
569 | dev_attr->show = readfunc; | |
570 | } | |
571 | ||
572 | if (writefunc) { | |
573 | dev_attr->attr.mode |= S_IWUSR; | |
574 | dev_attr->store = writefunc; | |
575 | } | |
576 | kfree(name_format); | |
577 | kfree(full_postfix); | |
578 | ||
579 | return 0; | |
580 | ||
581 | error_free_name_format: | |
582 | kfree(name_format); | |
583 | error_free_full_postfix: | |
584 | kfree(full_postfix); | |
585 | error_ret: | |
586 | return ret; | |
587 | } | |
588 | ||
df9c1c42 | 589 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
590 | { |
591 | kfree(dev_attr->attr.name); | |
592 | } | |
593 | ||
594 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
595 | struct iio_chan_spec const *chan, |
596 | ssize_t (*readfunc)(struct device *dev, | |
597 | struct device_attribute *attr, | |
598 | char *buf), | |
599 | ssize_t (*writefunc)(struct device *dev, | |
600 | struct device_attribute *attr, | |
601 | const char *buf, | |
602 | size_t len), | |
e614a54b | 603 | u64 mask, |
1d892719 JC |
604 | bool generic, |
605 | struct device *dev, | |
606 | struct list_head *attr_list) | |
607 | { | |
608 | int ret; | |
609 | struct iio_dev_attr *iio_attr, *t; | |
610 | ||
611 | iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL); | |
612 | if (iio_attr == NULL) { | |
613 | ret = -ENOMEM; | |
614 | goto error_ret; | |
615 | } | |
616 | ret = __iio_device_attr_init(&iio_attr->dev_attr, | |
617 | postfix, chan, | |
618 | readfunc, writefunc, generic); | |
619 | if (ret) | |
620 | goto error_iio_dev_attr_free; | |
621 | iio_attr->c = chan; | |
622 | iio_attr->address = mask; | |
623 | list_for_each_entry(t, attr_list, l) | |
624 | if (strcmp(t->dev_attr.attr.name, | |
625 | iio_attr->dev_attr.attr.name) == 0) { | |
626 | if (!generic) | |
627 | dev_err(dev, "tried to double register : %s\n", | |
628 | t->dev_attr.attr.name); | |
629 | ret = -EBUSY; | |
630 | goto error_device_attr_deinit; | |
631 | } | |
1d892719 JC |
632 | list_add(&iio_attr->l, attr_list); |
633 | ||
634 | return 0; | |
635 | ||
636 | error_device_attr_deinit: | |
637 | __iio_device_attr_deinit(&iio_attr->dev_attr); | |
638 | error_iio_dev_attr_free: | |
639 | kfree(iio_attr); | |
640 | error_ret: | |
641 | return ret; | |
642 | } | |
643 | ||
f8c6f4e9 | 644 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, |
1d892719 JC |
645 | struct iio_chan_spec const *chan) |
646 | { | |
5ccb3adb | 647 | int ret, attrcount = 0; |
75a973c7 | 648 | int i; |
5f420b42 | 649 | const struct iio_chan_spec_ext_info *ext_info; |
1d892719 | 650 | |
1d892719 JC |
651 | if (chan->channel < 0) |
652 | return 0; | |
75a973c7 | 653 | for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) { |
1d892719 | 654 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2], |
26d25ae3 | 655 | chan, |
1d892719 JC |
656 | &iio_read_channel_info, |
657 | &iio_write_channel_info, | |
c8a9f805 | 658 | i/2, |
1d892719 | 659 | !(i%2), |
f8c6f4e9 JC |
660 | &indio_dev->dev, |
661 | &indio_dev->channel_attr_list); | |
1d892719 JC |
662 | if (ret == -EBUSY && (i%2 == 0)) { |
663 | ret = 0; | |
664 | continue; | |
665 | } | |
666 | if (ret < 0) | |
667 | goto error_ret; | |
26d25ae3 | 668 | attrcount++; |
1d892719 | 669 | } |
5f420b42 LPC |
670 | |
671 | if (chan->ext_info) { | |
672 | unsigned int i = 0; | |
673 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { | |
674 | ret = __iio_add_chan_devattr(ext_info->name, | |
675 | chan, | |
676 | ext_info->read ? | |
677 | &iio_read_channel_ext_info : NULL, | |
678 | ext_info->write ? | |
679 | &iio_write_channel_ext_info : NULL, | |
680 | i, | |
681 | ext_info->shared, | |
682 | &indio_dev->dev, | |
683 | &indio_dev->channel_attr_list); | |
684 | i++; | |
685 | if (ret == -EBUSY && ext_info->shared) | |
686 | continue; | |
687 | ||
688 | if (ret) | |
689 | goto error_ret; | |
690 | ||
691 | attrcount++; | |
692 | } | |
693 | } | |
694 | ||
26d25ae3 | 695 | ret = attrcount; |
1d892719 JC |
696 | error_ret: |
697 | return ret; | |
698 | } | |
699 | ||
f8c6f4e9 | 700 | static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev, |
1d892719 JC |
701 | struct iio_dev_attr *p) |
702 | { | |
1d892719 JC |
703 | kfree(p->dev_attr.attr.name); |
704 | kfree(p); | |
705 | } | |
706 | ||
1b732888 JC |
707 | static ssize_t iio_show_dev_name(struct device *dev, |
708 | struct device_attribute *attr, | |
709 | char *buf) | |
710 | { | |
e53f5ac5 | 711 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1b732888 JC |
712 | return sprintf(buf, "%s\n", indio_dev->name); |
713 | } | |
714 | ||
715 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
716 | ||
f8c6f4e9 | 717 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 718 | { |
26d25ae3 | 719 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
1d892719 | 720 | struct iio_dev_attr *p, *n; |
26d25ae3 | 721 | struct attribute **attr; |
1d892719 | 722 | |
26d25ae3 | 723 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
724 | if (indio_dev->info->attrs) { |
725 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
726 | while (*attr++ != NULL) |
727 | attrcount_orig++; | |
847ec80b | 728 | } |
26d25ae3 | 729 | attrcount = attrcount_orig; |
1d892719 JC |
730 | /* |
731 | * New channel registration method - relies on the fact a group does | |
4abf6f8b | 732 | * not need to be initialized if it is name is NULL. |
1d892719 | 733 | */ |
f8c6f4e9 JC |
734 | if (indio_dev->channels) |
735 | for (i = 0; i < indio_dev->num_channels; i++) { | |
736 | ret = iio_device_add_channel_sysfs(indio_dev, | |
737 | &indio_dev | |
1d892719 JC |
738 | ->channels[i]); |
739 | if (ret < 0) | |
740 | goto error_clear_attrs; | |
26d25ae3 | 741 | attrcount += ret; |
1d892719 | 742 | } |
26d25ae3 | 743 | |
f8c6f4e9 | 744 | if (indio_dev->name) |
26d25ae3 JC |
745 | attrcount++; |
746 | ||
d83fb184 TM |
747 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
748 | sizeof(indio_dev->chan_attr_group.attrs[0]), | |
749 | GFP_KERNEL); | |
f8c6f4e9 | 750 | if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3 JC |
751 | ret = -ENOMEM; |
752 | goto error_clear_attrs; | |
1b732888 | 753 | } |
26d25ae3 | 754 | /* Copy across original attributes */ |
f8c6f4e9 JC |
755 | if (indio_dev->info->attrs) |
756 | memcpy(indio_dev->chan_attr_group.attrs, | |
757 | indio_dev->info->attrs->attrs, | |
758 | sizeof(indio_dev->chan_attr_group.attrs[0]) | |
26d25ae3 JC |
759 | *attrcount_orig); |
760 | attrn = attrcount_orig; | |
761 | /* Add all elements from the list. */ | |
f8c6f4e9 JC |
762 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
763 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; | |
764 | if (indio_dev->name) | |
765 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; | |
26d25ae3 | 766 | |
f8c6f4e9 JC |
767 | indio_dev->groups[indio_dev->groupcounter++] = |
768 | &indio_dev->chan_attr_group; | |
26d25ae3 | 769 | |
1d892719 | 770 | return 0; |
1b732888 | 771 | |
1d892719 JC |
772 | error_clear_attrs: |
773 | list_for_each_entry_safe(p, n, | |
f8c6f4e9 | 774 | &indio_dev->channel_attr_list, l) { |
1d892719 | 775 | list_del(&p->l); |
f8c6f4e9 | 776 | iio_device_remove_and_free_read_attr(indio_dev, p); |
1d892719 | 777 | } |
1d892719 | 778 | |
26d25ae3 | 779 | return ret; |
847ec80b JC |
780 | } |
781 | ||
f8c6f4e9 | 782 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 783 | { |
1d892719 JC |
784 | |
785 | struct iio_dev_attr *p, *n; | |
26d25ae3 | 786 | |
f8c6f4e9 | 787 | list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) { |
1d892719 | 788 | list_del(&p->l); |
f8c6f4e9 | 789 | iio_device_remove_and_free_read_attr(indio_dev, p); |
1d892719 | 790 | } |
f8c6f4e9 | 791 | kfree(indio_dev->chan_attr_group.attrs); |
847ec80b JC |
792 | } |
793 | ||
847ec80b JC |
794 | static void iio_dev_release(struct device *device) |
795 | { | |
e53f5ac5 | 796 | struct iio_dev *indio_dev = dev_to_iio_dev(device); |
e407fd65 LPC |
797 | if (indio_dev->chrdev.dev) |
798 | cdev_del(&indio_dev->chrdev); | |
f8c6f4e9 JC |
799 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
800 | iio_device_unregister_trigger_consumer(indio_dev); | |
801 | iio_device_unregister_eventset(indio_dev); | |
802 | iio_device_unregister_sysfs(indio_dev); | |
e553f182 | 803 | iio_device_unregister_debugfs(indio_dev); |
e407fd65 LPC |
804 | |
805 | ida_simple_remove(&iio_ida, indio_dev->id); | |
806 | kfree(indio_dev); | |
847ec80b JC |
807 | } |
808 | ||
809 | static struct device_type iio_dev_type = { | |
810 | .name = "iio_device", | |
811 | .release = iio_dev_release, | |
812 | }; | |
813 | ||
7cbb7537 | 814 | struct iio_dev *iio_device_alloc(int sizeof_priv) |
847ec80b | 815 | { |
6f7c8ee5 JC |
816 | struct iio_dev *dev; |
817 | size_t alloc_size; | |
818 | ||
819 | alloc_size = sizeof(struct iio_dev); | |
820 | if (sizeof_priv) { | |
821 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); | |
822 | alloc_size += sizeof_priv; | |
823 | } | |
824 | /* ensure 32-byte alignment of whole construct ? */ | |
825 | alloc_size += IIO_ALIGN - 1; | |
826 | ||
827 | dev = kzalloc(alloc_size, GFP_KERNEL); | |
847ec80b JC |
828 | |
829 | if (dev) { | |
26d25ae3 | 830 | dev->dev.groups = dev->groups; |
847ec80b | 831 | dev->dev.type = &iio_dev_type; |
5aaaeba8 | 832 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
833 | device_initialize(&dev->dev); |
834 | dev_set_drvdata(&dev->dev, (void *)dev); | |
835 | mutex_init(&dev->mlock); | |
ac917a81 | 836 | mutex_init(&dev->info_exist_lock); |
e407fd65 | 837 | INIT_LIST_HEAD(&dev->channel_attr_list); |
a9e39f9e JC |
838 | |
839 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); | |
840 | if (dev->id < 0) { | |
841 | /* cannot use a dev_err as the name isn't available */ | |
842 | printk(KERN_ERR "Failed to get id\n"); | |
843 | kfree(dev); | |
844 | return NULL; | |
845 | } | |
846 | dev_set_name(&dev->dev, "iio:device%d", dev->id); | |
847ec80b JC |
847 | } |
848 | ||
849 | return dev; | |
850 | } | |
7cbb7537 | 851 | EXPORT_SYMBOL(iio_device_alloc); |
847ec80b | 852 | |
7cbb7537 | 853 | void iio_device_free(struct iio_dev *dev) |
847ec80b | 854 | { |
e407fd65 LPC |
855 | if (dev) |
856 | put_device(&dev->dev); | |
847ec80b | 857 | } |
7cbb7537 | 858 | EXPORT_SYMBOL(iio_device_free); |
847ec80b | 859 | |
1aa04278 | 860 | /** |
14555b14 | 861 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
1aa04278 JC |
862 | **/ |
863 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
864 | { | |
f8c6f4e9 | 865 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 866 | struct iio_dev, chrdev); |
bb01443e LPC |
867 | |
868 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
869 | return -EBUSY; | |
870 | ||
f8c6f4e9 | 871 | filp->private_data = indio_dev; |
30eb82f0 | 872 | |
79335140 | 873 | return 0; |
1aa04278 JC |
874 | } |
875 | ||
876 | /** | |
14555b14 | 877 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
1aa04278 JC |
878 | **/ |
879 | static int iio_chrdev_release(struct inode *inode, struct file *filp) | |
880 | { | |
bb01443e LPC |
881 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
882 | struct iio_dev, chrdev); | |
bb01443e | 883 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
1aa04278 JC |
884 | return 0; |
885 | } | |
886 | ||
887 | /* Somewhat of a cross file organization violation - ioctls here are actually | |
888 | * event related */ | |
889 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
890 | { | |
891 | struct iio_dev *indio_dev = filp->private_data; | |
892 | int __user *ip = (int __user *)arg; | |
893 | int fd; | |
894 | ||
895 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { | |
896 | fd = iio_event_getfd(indio_dev); | |
897 | if (copy_to_user(ip, &fd, sizeof(fd))) | |
898 | return -EFAULT; | |
899 | return 0; | |
900 | } | |
901 | return -EINVAL; | |
902 | } | |
903 | ||
14555b14 JC |
904 | static const struct file_operations iio_buffer_fileops = { |
905 | .read = iio_buffer_read_first_n_outer_addr, | |
1aa04278 JC |
906 | .release = iio_chrdev_release, |
907 | .open = iio_chrdev_open, | |
14555b14 | 908 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
909 | .owner = THIS_MODULE, |
910 | .llseek = noop_llseek, | |
911 | .unlocked_ioctl = iio_ioctl, | |
912 | .compat_ioctl = iio_ioctl, | |
913 | }; | |
914 | ||
0f1acee5 MH |
915 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
916 | ||
f8c6f4e9 | 917 | int iio_device_register(struct iio_dev *indio_dev) |
847ec80b JC |
918 | { |
919 | int ret; | |
920 | ||
1aa04278 | 921 | /* configure elements for the chrdev */ |
f8c6f4e9 | 922 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 923 | |
e553f182 MH |
924 | ret = iio_device_register_debugfs(indio_dev); |
925 | if (ret) { | |
926 | dev_err(indio_dev->dev.parent, | |
927 | "Failed to register debugfs interfaces\n"); | |
928 | goto error_ret; | |
929 | } | |
f8c6f4e9 | 930 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 931 | if (ret) { |
f8c6f4e9 | 932 | dev_err(indio_dev->dev.parent, |
847ec80b | 933 | "Failed to register sysfs interfaces\n"); |
e553f182 | 934 | goto error_unreg_debugfs; |
847ec80b | 935 | } |
f8c6f4e9 | 936 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 937 | if (ret) { |
f8c6f4e9 | 938 | dev_err(indio_dev->dev.parent, |
c849d253 | 939 | "Failed to register event set\n"); |
847ec80b JC |
940 | goto error_free_sysfs; |
941 | } | |
f8c6f4e9 JC |
942 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
943 | iio_device_register_trigger_consumer(indio_dev); | |
847ec80b | 944 | |
0f1acee5 MH |
945 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
946 | indio_dev->setup_ops == NULL) | |
947 | indio_dev->setup_ops = &noop_ring_setup_ops; | |
948 | ||
f8c6f4e9 | 949 | ret = device_add(&indio_dev->dev); |
26d25ae3 JC |
950 | if (ret < 0) |
951 | goto error_unreg_eventset; | |
f8c6f4e9 JC |
952 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
953 | indio_dev->chrdev.owner = indio_dev->info->driver_module; | |
954 | ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); | |
26d25ae3 JC |
955 | if (ret < 0) |
956 | goto error_del_device; | |
847ec80b JC |
957 | return 0; |
958 | ||
847ec80b | 959 | error_del_device: |
f8c6f4e9 | 960 | device_del(&indio_dev->dev); |
26d25ae3 | 961 | error_unreg_eventset: |
f8c6f4e9 | 962 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 963 | error_free_sysfs: |
f8c6f4e9 | 964 | iio_device_unregister_sysfs(indio_dev); |
e553f182 MH |
965 | error_unreg_debugfs: |
966 | iio_device_unregister_debugfs(indio_dev); | |
847ec80b JC |
967 | error_ret: |
968 | return ret; | |
969 | } | |
970 | EXPORT_SYMBOL(iio_device_register); | |
971 | ||
f8c6f4e9 | 972 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 973 | { |
ac917a81 JC |
974 | mutex_lock(&indio_dev->info_exist_lock); |
975 | indio_dev->info = NULL; | |
976 | mutex_unlock(&indio_dev->info_exist_lock); | |
e407fd65 | 977 | device_del(&indio_dev->dev); |
847ec80b JC |
978 | } |
979 | EXPORT_SYMBOL(iio_device_unregister); | |
847ec80b JC |
980 | subsys_initcall(iio_init); |
981 | module_exit(iio_exit); | |
982 | ||
983 | MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>"); | |
984 | MODULE_DESCRIPTION("Industrial I/O core"); | |
985 | MODULE_LICENSE("GPL"); |