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 | |
99698b45 | 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", |
7c9ab035 | 102 | [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", |
1d892719 JC |
103 | }; |
104 | ||
5fb21c82 JC |
105 | const struct iio_chan_spec |
106 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) | |
107 | { | |
108 | int i; | |
109 | ||
110 | for (i = 0; i < indio_dev->num_channels; i++) | |
111 | if (indio_dev->channels[i].scan_index == si) | |
112 | return &indio_dev->channels[i]; | |
113 | return NULL; | |
114 | } | |
115 | ||
847ec80b JC |
116 | /* This turns up an awful lot */ |
117 | ssize_t iio_read_const_attr(struct device *dev, | |
118 | struct device_attribute *attr, | |
119 | char *buf) | |
120 | { | |
121 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
122 | } | |
123 | EXPORT_SYMBOL(iio_read_const_attr); | |
124 | ||
847ec80b JC |
125 | static int __init iio_init(void) |
126 | { | |
127 | int ret; | |
128 | ||
5aaaeba8 JC |
129 | /* Register sysfs bus */ |
130 | ret = bus_register(&iio_bus_type); | |
847ec80b JC |
131 | if (ret < 0) { |
132 | printk(KERN_ERR | |
5aaaeba8 | 133 | "%s could not register bus type\n", |
847ec80b JC |
134 | __FILE__); |
135 | goto error_nothing; | |
136 | } | |
137 | ||
9aa1a167 JC |
138 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
139 | if (ret < 0) { | |
140 | printk(KERN_ERR "%s: failed to allocate char dev region\n", | |
141 | __FILE__); | |
5aaaeba8 | 142 | goto error_unregister_bus_type; |
9aa1a167 | 143 | } |
847ec80b | 144 | |
e553f182 MH |
145 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
146 | ||
847ec80b JC |
147 | return 0; |
148 | ||
5aaaeba8 JC |
149 | error_unregister_bus_type: |
150 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
151 | error_nothing: |
152 | return ret; | |
153 | } | |
154 | ||
155 | static void __exit iio_exit(void) | |
156 | { | |
9aa1a167 JC |
157 | if (iio_devt) |
158 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 159 | bus_unregister(&iio_bus_type); |
e553f182 MH |
160 | debugfs_remove(iio_debugfs_dentry); |
161 | } | |
162 | ||
163 | #if defined(CONFIG_DEBUG_FS) | |
e553f182 MH |
164 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
165 | size_t count, loff_t *ppos) | |
166 | { | |
167 | struct iio_dev *indio_dev = file->private_data; | |
168 | char buf[20]; | |
169 | unsigned val = 0; | |
170 | ssize_t len; | |
171 | int ret; | |
172 | ||
173 | ret = indio_dev->info->debugfs_reg_access(indio_dev, | |
174 | indio_dev->cached_reg_addr, | |
175 | 0, &val); | |
176 | if (ret) | |
177 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); | |
178 | ||
179 | len = snprintf(buf, sizeof(buf), "0x%X\n", val); | |
180 | ||
181 | return simple_read_from_buffer(userbuf, count, ppos, buf, len); | |
182 | } | |
183 | ||
184 | static ssize_t iio_debugfs_write_reg(struct file *file, | |
185 | const char __user *userbuf, size_t count, loff_t *ppos) | |
186 | { | |
187 | struct iio_dev *indio_dev = file->private_data; | |
188 | unsigned reg, val; | |
189 | char buf[80]; | |
190 | int ret; | |
191 | ||
192 | count = min_t(size_t, count, (sizeof(buf)-1)); | |
193 | if (copy_from_user(buf, userbuf, count)) | |
194 | return -EFAULT; | |
195 | ||
196 | buf[count] = 0; | |
197 | ||
198 | ret = sscanf(buf, "%i %i", ®, &val); | |
199 | ||
200 | switch (ret) { | |
201 | case 1: | |
202 | indio_dev->cached_reg_addr = reg; | |
203 | break; | |
204 | case 2: | |
205 | indio_dev->cached_reg_addr = reg; | |
206 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, | |
207 | val, NULL); | |
208 | if (ret) { | |
209 | dev_err(indio_dev->dev.parent, "%s: write failed\n", | |
210 | __func__); | |
211 | return ret; | |
212 | } | |
213 | break; | |
214 | default: | |
215 | return -EINVAL; | |
216 | } | |
217 | ||
218 | return count; | |
219 | } | |
220 | ||
221 | static const struct file_operations iio_debugfs_reg_fops = { | |
5a28c873 | 222 | .open = simple_open, |
e553f182 MH |
223 | .read = iio_debugfs_read_reg, |
224 | .write = iio_debugfs_write_reg, | |
225 | }; | |
226 | ||
227 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
228 | { | |
229 | debugfs_remove_recursive(indio_dev->debugfs_dentry); | |
847ec80b JC |
230 | } |
231 | ||
e553f182 MH |
232 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
233 | { | |
234 | struct dentry *d; | |
235 | ||
236 | if (indio_dev->info->debugfs_reg_access == NULL) | |
237 | return 0; | |
238 | ||
abd5a2fb | 239 | if (!iio_debugfs_dentry) |
e553f182 MH |
240 | return 0; |
241 | ||
242 | indio_dev->debugfs_dentry = | |
243 | debugfs_create_dir(dev_name(&indio_dev->dev), | |
244 | iio_debugfs_dentry); | |
e553f182 MH |
245 | if (indio_dev->debugfs_dentry == NULL) { |
246 | dev_warn(indio_dev->dev.parent, | |
247 | "Failed to create debugfs directory\n"); | |
248 | return -EFAULT; | |
249 | } | |
250 | ||
251 | d = debugfs_create_file("direct_reg_access", 0644, | |
252 | indio_dev->debugfs_dentry, | |
253 | indio_dev, &iio_debugfs_reg_fops); | |
254 | if (!d) { | |
255 | iio_device_unregister_debugfs(indio_dev); | |
256 | return -ENOMEM; | |
257 | } | |
258 | ||
259 | return 0; | |
260 | } | |
261 | #else | |
262 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) | |
263 | { | |
264 | return 0; | |
265 | } | |
266 | ||
267 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
268 | { | |
269 | } | |
270 | #endif /* CONFIG_DEBUG_FS */ | |
271 | ||
4fee7e16 LPC |
272 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
273 | struct device_attribute *attr, | |
274 | char *buf) | |
275 | { | |
e53f5ac5 | 276 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
277 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
278 | const struct iio_chan_spec_ext_info *ext_info; | |
279 | ||
280 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
281 | ||
fc6d1139 | 282 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
4fee7e16 LPC |
283 | } |
284 | ||
285 | static ssize_t iio_write_channel_ext_info(struct device *dev, | |
286 | struct device_attribute *attr, | |
287 | const char *buf, | |
288 | size_t len) | |
289 | { | |
e53f5ac5 | 290 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
291 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
292 | const struct iio_chan_spec_ext_info *ext_info; | |
293 | ||
294 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
295 | ||
fc6d1139 MH |
296 | return ext_info->write(indio_dev, ext_info->private, |
297 | this_attr->c, buf, len); | |
4fee7e16 LPC |
298 | } |
299 | ||
5212cc8a LPC |
300 | ssize_t iio_enum_available_read(struct iio_dev *indio_dev, |
301 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
302 | { | |
303 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
304 | unsigned int i; | |
305 | size_t len = 0; | |
306 | ||
307 | if (!e->num_items) | |
308 | return 0; | |
309 | ||
310 | for (i = 0; i < e->num_items; ++i) | |
74dcd439 | 311 | len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); |
5212cc8a LPC |
312 | |
313 | /* replace last space with a newline */ | |
314 | buf[len - 1] = '\n'; | |
315 | ||
316 | return len; | |
317 | } | |
318 | EXPORT_SYMBOL_GPL(iio_enum_available_read); | |
319 | ||
320 | ssize_t iio_enum_read(struct iio_dev *indio_dev, | |
321 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
322 | { | |
323 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
324 | int i; | |
325 | ||
326 | if (!e->get) | |
327 | return -EINVAL; | |
328 | ||
329 | i = e->get(indio_dev, chan); | |
330 | if (i < 0) | |
331 | return i; | |
332 | else if (i >= e->num_items) | |
333 | return -EINVAL; | |
334 | ||
335 | return sprintf(buf, "%s\n", e->items[i]); | |
336 | } | |
337 | EXPORT_SYMBOL_GPL(iio_enum_read); | |
338 | ||
339 | ssize_t iio_enum_write(struct iio_dev *indio_dev, | |
340 | uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, | |
341 | size_t len) | |
342 | { | |
343 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
344 | unsigned int i; | |
345 | int ret; | |
346 | ||
347 | if (!e->set) | |
348 | return -EINVAL; | |
349 | ||
350 | for (i = 0; i < e->num_items; i++) { | |
351 | if (sysfs_streq(buf, e->items[i])) | |
352 | break; | |
353 | } | |
354 | ||
355 | if (i == e->num_items) | |
356 | return -EINVAL; | |
357 | ||
358 | ret = e->set(indio_dev, chan, i); | |
359 | return ret ? ret : len; | |
360 | } | |
361 | EXPORT_SYMBOL_GPL(iio_enum_write); | |
362 | ||
1d892719 JC |
363 | static ssize_t iio_read_channel_info(struct device *dev, |
364 | struct device_attribute *attr, | |
365 | char *buf) | |
847ec80b | 366 | { |
e53f5ac5 | 367 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719 | 368 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
7985e7c1 | 369 | unsigned long long tmp; |
1d892719 | 370 | int val, val2; |
67eedba3 | 371 | bool scale_db = false; |
6fe8135f JC |
372 | int ret = indio_dev->info->read_raw(indio_dev, this_attr->c, |
373 | &val, &val2, this_attr->address); | |
1d892719 JC |
374 | |
375 | if (ret < 0) | |
376 | return ret; | |
847ec80b | 377 | |
67eedba3 MH |
378 | switch (ret) { |
379 | case IIO_VAL_INT: | |
1d892719 | 380 | return sprintf(buf, "%d\n", val); |
67eedba3 MH |
381 | case IIO_VAL_INT_PLUS_MICRO_DB: |
382 | scale_db = true; | |
383 | case IIO_VAL_INT_PLUS_MICRO: | |
1d892719 | 384 | if (val2 < 0) |
67eedba3 MH |
385 | return sprintf(buf, "-%d.%06u%s\n", val, -val2, |
386 | scale_db ? " dB" : ""); | |
1d892719 | 387 | else |
67eedba3 MH |
388 | return sprintf(buf, "%d.%06u%s\n", val, val2, |
389 | scale_db ? " dB" : ""); | |
390 | case IIO_VAL_INT_PLUS_NANO: | |
71646e2c MH |
391 | if (val2 < 0) |
392 | return sprintf(buf, "-%d.%09u\n", val, -val2); | |
393 | else | |
394 | return sprintf(buf, "%d.%09u\n", val, val2); | |
7985e7c1 LPC |
395 | case IIO_VAL_FRACTIONAL: |
396 | tmp = div_s64((s64)val * 1000000000LL, val2); | |
397 | val2 = do_div(tmp, 1000000000LL); | |
398 | val = tmp; | |
399 | return sprintf(buf, "%d.%09u\n", val, val2); | |
67eedba3 | 400 | default: |
1d892719 | 401 | return 0; |
67eedba3 | 402 | } |
1d892719 JC |
403 | } |
404 | ||
405 | static ssize_t iio_write_channel_info(struct device *dev, | |
406 | struct device_attribute *attr, | |
407 | const char *buf, | |
408 | size_t len) | |
409 | { | |
e53f5ac5 | 410 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719 | 411 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
5c04af04 | 412 | int ret, integer = 0, fract = 0, fract_mult = 100000; |
1d892719 JC |
413 | bool integer_part = true, negative = false; |
414 | ||
415 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 416 | if (!indio_dev->info->write_raw) |
1d892719 | 417 | return -EINVAL; |
5c04af04 MH |
418 | |
419 | if (indio_dev->info->write_raw_get_fmt) | |
420 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, | |
421 | this_attr->c, this_attr->address)) { | |
422 | case IIO_VAL_INT_PLUS_MICRO: | |
423 | fract_mult = 100000; | |
424 | break; | |
425 | case IIO_VAL_INT_PLUS_NANO: | |
426 | fract_mult = 100000000; | |
427 | break; | |
428 | default: | |
429 | return -EINVAL; | |
430 | } | |
431 | ||
1d892719 JC |
432 | if (buf[0] == '-') { |
433 | negative = true; | |
434 | buf++; | |
435 | } | |
5c04af04 | 436 | |
1d892719 JC |
437 | while (*buf) { |
438 | if ('0' <= *buf && *buf <= '9') { | |
439 | if (integer_part) | |
440 | integer = integer*10 + *buf - '0'; | |
441 | else { | |
5c04af04 MH |
442 | fract += fract_mult*(*buf - '0'); |
443 | if (fract_mult == 1) | |
1d892719 | 444 | break; |
5c04af04 | 445 | fract_mult /= 10; |
1d892719 JC |
446 | } |
447 | } else if (*buf == '\n') { | |
448 | if (*(buf + 1) == '\0') | |
449 | break; | |
450 | else | |
451 | return -EINVAL; | |
452 | } else if (*buf == '.') { | |
453 | integer_part = false; | |
454 | } else { | |
455 | return -EINVAL; | |
456 | } | |
457 | buf++; | |
458 | } | |
459 | if (negative) { | |
460 | if (integer) | |
461 | integer = -integer; | |
462 | else | |
5c04af04 | 463 | fract = -fract; |
1d892719 JC |
464 | } |
465 | ||
6fe8135f | 466 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 467 | integer, fract, this_attr->address); |
1d892719 JC |
468 | if (ret) |
469 | return ret; | |
470 | ||
471 | return len; | |
472 | } | |
473 | ||
df9c1c42 | 474 | static |
1d892719 JC |
475 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
476 | const char *postfix, | |
477 | struct iio_chan_spec const *chan, | |
478 | ssize_t (*readfunc)(struct device *dev, | |
479 | struct device_attribute *attr, | |
480 | char *buf), | |
481 | ssize_t (*writefunc)(struct device *dev, | |
482 | struct device_attribute *attr, | |
483 | const char *buf, | |
484 | size_t len), | |
485 | bool generic) | |
486 | { | |
487 | int ret; | |
488 | char *name_format, *full_postfix; | |
489 | sysfs_attr_init(&dev_attr->attr); | |
1d892719 | 490 | |
ade7ef7b | 491 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
0403e0d6 | 492 | if (chan->modified && !generic) { |
ade7ef7b JC |
493 | if (chan->extend_name) |
494 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
495 | iio_modifier_names[chan | |
496 | ->channel2], | |
497 | chan->extend_name, | |
498 | postfix); | |
499 | else | |
500 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
501 | iio_modifier_names[chan | |
502 | ->channel2], | |
503 | postfix); | |
504 | } else { | |
505 | if (chan->extend_name == NULL) | |
506 | full_postfix = kstrdup(postfix, GFP_KERNEL); | |
507 | else | |
508 | full_postfix = kasprintf(GFP_KERNEL, | |
509 | "%s_%s", | |
510 | chan->extend_name, | |
511 | postfix); | |
512 | } | |
513 | if (full_postfix == NULL) { | |
514 | ret = -ENOMEM; | |
515 | goto error_ret; | |
516 | } | |
1d892719 | 517 | |
4abf6f8b | 518 | if (chan->differential) { /* Differential can not have modifier */ |
ade7ef7b JC |
519 | if (generic) |
520 | name_format | |
521 | = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", | |
522 | iio_direction[chan->output], | |
523 | iio_chan_type_name_spec[chan->type], | |
524 | iio_chan_type_name_spec[chan->type], | |
525 | full_postfix); | |
526 | else if (chan->indexed) | |
527 | name_format | |
528 | = kasprintf(GFP_KERNEL, "%s_%s%d-%s%d_%s", | |
529 | iio_direction[chan->output], | |
530 | iio_chan_type_name_spec[chan->type], | |
531 | chan->channel, | |
532 | iio_chan_type_name_spec[chan->type], | |
533 | chan->channel2, | |
534 | full_postfix); | |
535 | else { | |
536 | WARN_ON("Differential channels must be indexed\n"); | |
537 | ret = -EINVAL; | |
538 | goto error_free_full_postfix; | |
539 | } | |
540 | } else { /* Single ended */ | |
541 | if (generic) | |
542 | name_format | |
543 | = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
544 | iio_direction[chan->output], | |
545 | iio_chan_type_name_spec[chan->type], | |
546 | full_postfix); | |
547 | else if (chan->indexed) | |
548 | name_format | |
549 | = kasprintf(GFP_KERNEL, "%s_%s%d_%s", | |
550 | iio_direction[chan->output], | |
551 | iio_chan_type_name_spec[chan->type], | |
552 | chan->channel, | |
553 | full_postfix); | |
554 | else | |
555 | name_format | |
556 | = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
557 | iio_direction[chan->output], | |
558 | iio_chan_type_name_spec[chan->type], | |
559 | full_postfix); | |
560 | } | |
1d892719 JC |
561 | if (name_format == NULL) { |
562 | ret = -ENOMEM; | |
563 | goto error_free_full_postfix; | |
564 | } | |
565 | dev_attr->attr.name = kasprintf(GFP_KERNEL, | |
566 | name_format, | |
567 | chan->channel, | |
568 | chan->channel2); | |
569 | if (dev_attr->attr.name == NULL) { | |
570 | ret = -ENOMEM; | |
571 | goto error_free_name_format; | |
572 | } | |
573 | ||
574 | if (readfunc) { | |
575 | dev_attr->attr.mode |= S_IRUGO; | |
576 | dev_attr->show = readfunc; | |
577 | } | |
578 | ||
579 | if (writefunc) { | |
580 | dev_attr->attr.mode |= S_IWUSR; | |
581 | dev_attr->store = writefunc; | |
582 | } | |
583 | kfree(name_format); | |
584 | kfree(full_postfix); | |
585 | ||
586 | return 0; | |
587 | ||
588 | error_free_name_format: | |
589 | kfree(name_format); | |
590 | error_free_full_postfix: | |
591 | kfree(full_postfix); | |
592 | error_ret: | |
593 | return ret; | |
594 | } | |
595 | ||
df9c1c42 | 596 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
597 | { |
598 | kfree(dev_attr->attr.name); | |
599 | } | |
600 | ||
601 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
602 | struct iio_chan_spec const *chan, |
603 | ssize_t (*readfunc)(struct device *dev, | |
604 | struct device_attribute *attr, | |
605 | char *buf), | |
606 | ssize_t (*writefunc)(struct device *dev, | |
607 | struct device_attribute *attr, | |
608 | const char *buf, | |
609 | size_t len), | |
e614a54b | 610 | u64 mask, |
1d892719 JC |
611 | bool generic, |
612 | struct device *dev, | |
613 | struct list_head *attr_list) | |
614 | { | |
615 | int ret; | |
616 | struct iio_dev_attr *iio_attr, *t; | |
617 | ||
618 | iio_attr = kzalloc(sizeof *iio_attr, GFP_KERNEL); | |
619 | if (iio_attr == NULL) { | |
620 | ret = -ENOMEM; | |
621 | goto error_ret; | |
622 | } | |
623 | ret = __iio_device_attr_init(&iio_attr->dev_attr, | |
624 | postfix, chan, | |
625 | readfunc, writefunc, generic); | |
626 | if (ret) | |
627 | goto error_iio_dev_attr_free; | |
628 | iio_attr->c = chan; | |
629 | iio_attr->address = mask; | |
630 | list_for_each_entry(t, attr_list, l) | |
631 | if (strcmp(t->dev_attr.attr.name, | |
632 | iio_attr->dev_attr.attr.name) == 0) { | |
633 | if (!generic) | |
634 | dev_err(dev, "tried to double register : %s\n", | |
635 | t->dev_attr.attr.name); | |
636 | ret = -EBUSY; | |
637 | goto error_device_attr_deinit; | |
638 | } | |
1d892719 JC |
639 | list_add(&iio_attr->l, attr_list); |
640 | ||
641 | return 0; | |
642 | ||
643 | error_device_attr_deinit: | |
644 | __iio_device_attr_deinit(&iio_attr->dev_attr); | |
645 | error_iio_dev_attr_free: | |
646 | kfree(iio_attr); | |
647 | error_ret: | |
648 | return ret; | |
649 | } | |
650 | ||
f8c6f4e9 | 651 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, |
1d892719 JC |
652 | struct iio_chan_spec const *chan) |
653 | { | |
5ccb3adb | 654 | int ret, attrcount = 0; |
75a973c7 | 655 | int i; |
5f420b42 | 656 | const struct iio_chan_spec_ext_info *ext_info; |
1d892719 | 657 | |
1d892719 JC |
658 | if (chan->channel < 0) |
659 | return 0; | |
75a973c7 | 660 | for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) { |
1d892719 | 661 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2], |
26d25ae3 | 662 | chan, |
1d892719 JC |
663 | &iio_read_channel_info, |
664 | &iio_write_channel_info, | |
c8a9f805 | 665 | i/2, |
1d892719 | 666 | !(i%2), |
f8c6f4e9 JC |
667 | &indio_dev->dev, |
668 | &indio_dev->channel_attr_list); | |
1d892719 JC |
669 | if (ret == -EBUSY && (i%2 == 0)) { |
670 | ret = 0; | |
671 | continue; | |
672 | } | |
673 | if (ret < 0) | |
674 | goto error_ret; | |
26d25ae3 | 675 | attrcount++; |
1d892719 | 676 | } |
5f420b42 LPC |
677 | |
678 | if (chan->ext_info) { | |
679 | unsigned int i = 0; | |
680 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { | |
681 | ret = __iio_add_chan_devattr(ext_info->name, | |
682 | chan, | |
683 | ext_info->read ? | |
684 | &iio_read_channel_ext_info : NULL, | |
685 | ext_info->write ? | |
686 | &iio_write_channel_ext_info : NULL, | |
687 | i, | |
688 | ext_info->shared, | |
689 | &indio_dev->dev, | |
690 | &indio_dev->channel_attr_list); | |
691 | i++; | |
692 | if (ret == -EBUSY && ext_info->shared) | |
693 | continue; | |
694 | ||
695 | if (ret) | |
696 | goto error_ret; | |
697 | ||
698 | attrcount++; | |
699 | } | |
700 | } | |
701 | ||
26d25ae3 | 702 | ret = attrcount; |
1d892719 JC |
703 | error_ret: |
704 | return ret; | |
705 | } | |
706 | ||
f8c6f4e9 | 707 | static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev, |
1d892719 JC |
708 | struct iio_dev_attr *p) |
709 | { | |
1d892719 JC |
710 | kfree(p->dev_attr.attr.name); |
711 | kfree(p); | |
712 | } | |
713 | ||
1b732888 JC |
714 | static ssize_t iio_show_dev_name(struct device *dev, |
715 | struct device_attribute *attr, | |
716 | char *buf) | |
717 | { | |
e53f5ac5 | 718 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1b732888 JC |
719 | return sprintf(buf, "%s\n", indio_dev->name); |
720 | } | |
721 | ||
722 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
723 | ||
f8c6f4e9 | 724 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 725 | { |
26d25ae3 | 726 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
1d892719 | 727 | struct iio_dev_attr *p, *n; |
26d25ae3 | 728 | struct attribute **attr; |
1d892719 | 729 | |
26d25ae3 | 730 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
731 | if (indio_dev->info->attrs) { |
732 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
733 | while (*attr++ != NULL) |
734 | attrcount_orig++; | |
847ec80b | 735 | } |
26d25ae3 | 736 | attrcount = attrcount_orig; |
1d892719 JC |
737 | /* |
738 | * New channel registration method - relies on the fact a group does | |
d25b3808 | 739 | * not need to be initialized if its name is NULL. |
1d892719 | 740 | */ |
f8c6f4e9 JC |
741 | if (indio_dev->channels) |
742 | for (i = 0; i < indio_dev->num_channels; i++) { | |
743 | ret = iio_device_add_channel_sysfs(indio_dev, | |
744 | &indio_dev | |
1d892719 JC |
745 | ->channels[i]); |
746 | if (ret < 0) | |
747 | goto error_clear_attrs; | |
26d25ae3 | 748 | attrcount += ret; |
1d892719 | 749 | } |
26d25ae3 | 750 | |
f8c6f4e9 | 751 | if (indio_dev->name) |
26d25ae3 JC |
752 | attrcount++; |
753 | ||
d83fb184 TM |
754 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
755 | sizeof(indio_dev->chan_attr_group.attrs[0]), | |
756 | GFP_KERNEL); | |
f8c6f4e9 | 757 | if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3 JC |
758 | ret = -ENOMEM; |
759 | goto error_clear_attrs; | |
1b732888 | 760 | } |
26d25ae3 | 761 | /* Copy across original attributes */ |
f8c6f4e9 JC |
762 | if (indio_dev->info->attrs) |
763 | memcpy(indio_dev->chan_attr_group.attrs, | |
764 | indio_dev->info->attrs->attrs, | |
765 | sizeof(indio_dev->chan_attr_group.attrs[0]) | |
26d25ae3 JC |
766 | *attrcount_orig); |
767 | attrn = attrcount_orig; | |
768 | /* Add all elements from the list. */ | |
f8c6f4e9 JC |
769 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
770 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; | |
771 | if (indio_dev->name) | |
772 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; | |
26d25ae3 | 773 | |
f8c6f4e9 JC |
774 | indio_dev->groups[indio_dev->groupcounter++] = |
775 | &indio_dev->chan_attr_group; | |
26d25ae3 | 776 | |
1d892719 | 777 | return 0; |
1b732888 | 778 | |
1d892719 JC |
779 | error_clear_attrs: |
780 | list_for_each_entry_safe(p, n, | |
f8c6f4e9 | 781 | &indio_dev->channel_attr_list, l) { |
1d892719 | 782 | list_del(&p->l); |
f8c6f4e9 | 783 | iio_device_remove_and_free_read_attr(indio_dev, p); |
1d892719 | 784 | } |
1d892719 | 785 | |
26d25ae3 | 786 | return ret; |
847ec80b JC |
787 | } |
788 | ||
f8c6f4e9 | 789 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 790 | { |
1d892719 JC |
791 | |
792 | struct iio_dev_attr *p, *n; | |
26d25ae3 | 793 | |
f8c6f4e9 | 794 | list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) { |
1d892719 | 795 | list_del(&p->l); |
f8c6f4e9 | 796 | iio_device_remove_and_free_read_attr(indio_dev, p); |
1d892719 | 797 | } |
f8c6f4e9 | 798 | kfree(indio_dev->chan_attr_group.attrs); |
847ec80b JC |
799 | } |
800 | ||
847ec80b JC |
801 | static void iio_dev_release(struct device *device) |
802 | { | |
e53f5ac5 | 803 | struct iio_dev *indio_dev = dev_to_iio_dev(device); |
e407fd65 LPC |
804 | if (indio_dev->chrdev.dev) |
805 | cdev_del(&indio_dev->chrdev); | |
f8c6f4e9 JC |
806 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
807 | iio_device_unregister_trigger_consumer(indio_dev); | |
808 | iio_device_unregister_eventset(indio_dev); | |
809 | iio_device_unregister_sysfs(indio_dev); | |
e553f182 | 810 | iio_device_unregister_debugfs(indio_dev); |
e407fd65 LPC |
811 | |
812 | ida_simple_remove(&iio_ida, indio_dev->id); | |
813 | kfree(indio_dev); | |
847ec80b JC |
814 | } |
815 | ||
816 | static struct device_type iio_dev_type = { | |
817 | .name = "iio_device", | |
818 | .release = iio_dev_release, | |
819 | }; | |
820 | ||
7cbb7537 | 821 | struct iio_dev *iio_device_alloc(int sizeof_priv) |
847ec80b | 822 | { |
6f7c8ee5 JC |
823 | struct iio_dev *dev; |
824 | size_t alloc_size; | |
825 | ||
826 | alloc_size = sizeof(struct iio_dev); | |
827 | if (sizeof_priv) { | |
828 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); | |
829 | alloc_size += sizeof_priv; | |
830 | } | |
831 | /* ensure 32-byte alignment of whole construct ? */ | |
832 | alloc_size += IIO_ALIGN - 1; | |
833 | ||
834 | dev = kzalloc(alloc_size, GFP_KERNEL); | |
847ec80b JC |
835 | |
836 | if (dev) { | |
26d25ae3 | 837 | dev->dev.groups = dev->groups; |
847ec80b | 838 | dev->dev.type = &iio_dev_type; |
5aaaeba8 | 839 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
840 | device_initialize(&dev->dev); |
841 | dev_set_drvdata(&dev->dev, (void *)dev); | |
842 | mutex_init(&dev->mlock); | |
ac917a81 | 843 | mutex_init(&dev->info_exist_lock); |
e407fd65 | 844 | INIT_LIST_HEAD(&dev->channel_attr_list); |
a9e39f9e JC |
845 | |
846 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); | |
847 | if (dev->id < 0) { | |
848 | /* cannot use a dev_err as the name isn't available */ | |
849 | printk(KERN_ERR "Failed to get id\n"); | |
850 | kfree(dev); | |
851 | return NULL; | |
852 | } | |
853 | dev_set_name(&dev->dev, "iio:device%d", dev->id); | |
847ec80b JC |
854 | } |
855 | ||
856 | return dev; | |
857 | } | |
7cbb7537 | 858 | EXPORT_SYMBOL(iio_device_alloc); |
847ec80b | 859 | |
7cbb7537 | 860 | void iio_device_free(struct iio_dev *dev) |
847ec80b | 861 | { |
e407fd65 LPC |
862 | if (dev) |
863 | put_device(&dev->dev); | |
847ec80b | 864 | } |
7cbb7537 | 865 | EXPORT_SYMBOL(iio_device_free); |
847ec80b | 866 | |
1aa04278 | 867 | /** |
14555b14 | 868 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
1aa04278 JC |
869 | **/ |
870 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
871 | { | |
f8c6f4e9 | 872 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 873 | struct iio_dev, chrdev); |
bb01443e LPC |
874 | |
875 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
876 | return -EBUSY; | |
877 | ||
f8c6f4e9 | 878 | filp->private_data = indio_dev; |
30eb82f0 | 879 | |
79335140 | 880 | return 0; |
1aa04278 JC |
881 | } |
882 | ||
883 | /** | |
14555b14 | 884 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
1aa04278 JC |
885 | **/ |
886 | static int iio_chrdev_release(struct inode *inode, struct file *filp) | |
887 | { | |
bb01443e LPC |
888 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
889 | struct iio_dev, chrdev); | |
bb01443e | 890 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
1aa04278 JC |
891 | return 0; |
892 | } | |
893 | ||
894 | /* Somewhat of a cross file organization violation - ioctls here are actually | |
895 | * event related */ | |
896 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
897 | { | |
898 | struct iio_dev *indio_dev = filp->private_data; | |
899 | int __user *ip = (int __user *)arg; | |
900 | int fd; | |
901 | ||
902 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { | |
903 | fd = iio_event_getfd(indio_dev); | |
904 | if (copy_to_user(ip, &fd, sizeof(fd))) | |
905 | return -EFAULT; | |
906 | return 0; | |
907 | } | |
908 | return -EINVAL; | |
909 | } | |
910 | ||
14555b14 JC |
911 | static const struct file_operations iio_buffer_fileops = { |
912 | .read = iio_buffer_read_first_n_outer_addr, | |
1aa04278 JC |
913 | .release = iio_chrdev_release, |
914 | .open = iio_chrdev_open, | |
14555b14 | 915 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
916 | .owner = THIS_MODULE, |
917 | .llseek = noop_llseek, | |
918 | .unlocked_ioctl = iio_ioctl, | |
919 | .compat_ioctl = iio_ioctl, | |
920 | }; | |
921 | ||
0f1acee5 MH |
922 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
923 | ||
f8c6f4e9 | 924 | int iio_device_register(struct iio_dev *indio_dev) |
847ec80b JC |
925 | { |
926 | int ret; | |
927 | ||
1aa04278 | 928 | /* configure elements for the chrdev */ |
f8c6f4e9 | 929 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 930 | |
e553f182 MH |
931 | ret = iio_device_register_debugfs(indio_dev); |
932 | if (ret) { | |
933 | dev_err(indio_dev->dev.parent, | |
934 | "Failed to register debugfs interfaces\n"); | |
935 | goto error_ret; | |
936 | } | |
f8c6f4e9 | 937 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 938 | if (ret) { |
f8c6f4e9 | 939 | dev_err(indio_dev->dev.parent, |
847ec80b | 940 | "Failed to register sysfs interfaces\n"); |
e553f182 | 941 | goto error_unreg_debugfs; |
847ec80b | 942 | } |
f8c6f4e9 | 943 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 944 | if (ret) { |
f8c6f4e9 | 945 | dev_err(indio_dev->dev.parent, |
c849d253 | 946 | "Failed to register event set\n"); |
847ec80b JC |
947 | goto error_free_sysfs; |
948 | } | |
f8c6f4e9 JC |
949 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
950 | iio_device_register_trigger_consumer(indio_dev); | |
847ec80b | 951 | |
0f1acee5 MH |
952 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
953 | indio_dev->setup_ops == NULL) | |
954 | indio_dev->setup_ops = &noop_ring_setup_ops; | |
955 | ||
f8c6f4e9 | 956 | ret = device_add(&indio_dev->dev); |
26d25ae3 JC |
957 | if (ret < 0) |
958 | goto error_unreg_eventset; | |
f8c6f4e9 JC |
959 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
960 | indio_dev->chrdev.owner = indio_dev->info->driver_module; | |
961 | ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); | |
26d25ae3 JC |
962 | if (ret < 0) |
963 | goto error_del_device; | |
847ec80b JC |
964 | return 0; |
965 | ||
847ec80b | 966 | error_del_device: |
f8c6f4e9 | 967 | device_del(&indio_dev->dev); |
26d25ae3 | 968 | error_unreg_eventset: |
f8c6f4e9 | 969 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 970 | error_free_sysfs: |
f8c6f4e9 | 971 | iio_device_unregister_sysfs(indio_dev); |
e553f182 MH |
972 | error_unreg_debugfs: |
973 | iio_device_unregister_debugfs(indio_dev); | |
847ec80b JC |
974 | error_ret: |
975 | return ret; | |
976 | } | |
977 | EXPORT_SYMBOL(iio_device_register); | |
978 | ||
f8c6f4e9 | 979 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 980 | { |
ac917a81 JC |
981 | mutex_lock(&indio_dev->info_exist_lock); |
982 | indio_dev->info = NULL; | |
983 | mutex_unlock(&indio_dev->info_exist_lock); | |
e407fd65 | 984 | device_del(&indio_dev->dev); |
847ec80b JC |
985 | } |
986 | EXPORT_SYMBOL(iio_device_unregister); | |
847ec80b JC |
987 | subsys_initcall(iio_init); |
988 | module_exit(iio_exit); | |
989 | ||
c8b95952 | 990 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
847ec80b JC |
991 | MODULE_DESCRIPTION("Industrial I/O core"); |
992 | MODULE_LICENSE("GPL"); |