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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", |
c4f0c693 | 68 | [IIO_PRESSURE] = "pressure", |
1d892719 JC |
69 | }; |
70 | ||
330c6c57 | 71 | static const char * const iio_modifier_names[] = { |
1d892719 JC |
72 | [IIO_MOD_X] = "x", |
73 | [IIO_MOD_Y] = "y", | |
74 | [IIO_MOD_Z] = "z", | |
8f5879b2 | 75 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", |
cf82cb81 | 76 | [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", |
330c6c57 JC |
77 | [IIO_MOD_LIGHT_BOTH] = "both", |
78 | [IIO_MOD_LIGHT_IR] = "ir", | |
21cd1fab JB |
79 | [IIO_MOD_LIGHT_CLEAR] = "clear", |
80 | [IIO_MOD_LIGHT_RED] = "red", | |
81 | [IIO_MOD_LIGHT_GREEN] = "green", | |
82 | [IIO_MOD_LIGHT_BLUE] = "blue", | |
1d892719 JC |
83 | }; |
84 | ||
85 | /* relies on pairs of these shared then separate */ | |
86 | static const char * const iio_chan_info_postfix[] = { | |
75a973c7 JC |
87 | [IIO_CHAN_INFO_RAW] = "raw", |
88 | [IIO_CHAN_INFO_PROCESSED] = "input", | |
c8a9f805 JC |
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", | |
df94aba8 JC |
97 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
98 | = "filter_low_pass_3db_frequency", | |
ce85a1cb | 99 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", |
a6b12855 MH |
100 | [IIO_CHAN_INFO_FREQUENCY] = "frequency", |
101 | [IIO_CHAN_INFO_PHASE] = "phase", | |
b65d6212 | 102 | [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", |
7c9ab035 | 103 | [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", |
1d892719 JC |
104 | }; |
105 | ||
5fb21c82 JC |
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 | ||
847ec80b JC |
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 | ||
847ec80b JC |
126 | static int __init iio_init(void) |
127 | { | |
128 | int ret; | |
129 | ||
5aaaeba8 JC |
130 | /* Register sysfs bus */ |
131 | ret = bus_register(&iio_bus_type); | |
847ec80b JC |
132 | if (ret < 0) { |
133 | printk(KERN_ERR | |
5aaaeba8 | 134 | "%s could not register bus type\n", |
847ec80b JC |
135 | __FILE__); |
136 | goto error_nothing; | |
137 | } | |
138 | ||
9aa1a167 JC |
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__); | |
5aaaeba8 | 143 | goto error_unregister_bus_type; |
9aa1a167 | 144 | } |
847ec80b | 145 | |
e553f182 MH |
146 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
147 | ||
847ec80b JC |
148 | return 0; |
149 | ||
5aaaeba8 JC |
150 | error_unregister_bus_type: |
151 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
152 | error_nothing: |
153 | return ret; | |
154 | } | |
155 | ||
156 | static void __exit iio_exit(void) | |
157 | { | |
9aa1a167 JC |
158 | if (iio_devt) |
159 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 160 | bus_unregister(&iio_bus_type); |
e553f182 MH |
161 | debugfs_remove(iio_debugfs_dentry); |
162 | } | |
163 | ||
164 | #if defined(CONFIG_DEBUG_FS) | |
e553f182 MH |
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 = { | |
5a28c873 | 223 | .open = simple_open, |
e553f182 MH |
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); | |
847ec80b JC |
231 | } |
232 | ||
e553f182 MH |
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 | ||
abd5a2fb | 240 | if (!iio_debugfs_dentry) |
e553f182 MH |
241 | return 0; |
242 | ||
243 | indio_dev->debugfs_dentry = | |
244 | debugfs_create_dir(dev_name(&indio_dev->dev), | |
245 | iio_debugfs_dentry); | |
e553f182 MH |
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 | ||
4fee7e16 LPC |
273 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
274 | struct device_attribute *attr, | |
275 | char *buf) | |
276 | { | |
e53f5ac5 | 277 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
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 | ||
fc6d1139 | 283 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
4fee7e16 LPC |
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 | { | |
e53f5ac5 | 291 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
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 | ||
fc6d1139 MH |
297 | return ext_info->write(indio_dev, ext_info->private, |
298 | this_attr->c, buf, len); | |
4fee7e16 LPC |
299 | } |
300 | ||
5212cc8a LPC |
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) | |
74dcd439 | 312 | len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); |
5212cc8a LPC |
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 | ||
1d892719 JC |
364 | static ssize_t iio_read_channel_info(struct device *dev, |
365 | struct device_attribute *attr, | |
366 | char *buf) | |
847ec80b | 367 | { |
e53f5ac5 | 368 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719 | 369 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
7985e7c1 | 370 | unsigned long long tmp; |
1d892719 | 371 | int val, val2; |
67eedba3 | 372 | bool scale_db = false; |
6fe8135f JC |
373 | int ret = indio_dev->info->read_raw(indio_dev, this_attr->c, |
374 | &val, &val2, this_attr->address); | |
1d892719 JC |
375 | |
376 | if (ret < 0) | |
377 | return ret; | |
847ec80b | 378 | |
67eedba3 MH |
379 | switch (ret) { |
380 | case IIO_VAL_INT: | |
1d892719 | 381 | return sprintf(buf, "%d\n", val); |
67eedba3 MH |
382 | case IIO_VAL_INT_PLUS_MICRO_DB: |
383 | scale_db = true; | |
384 | case IIO_VAL_INT_PLUS_MICRO: | |
1d892719 | 385 | if (val2 < 0) |
67eedba3 MH |
386 | return sprintf(buf, "-%d.%06u%s\n", val, -val2, |
387 | scale_db ? " dB" : ""); | |
1d892719 | 388 | else |
67eedba3 MH |
389 | return sprintf(buf, "%d.%06u%s\n", val, val2, |
390 | scale_db ? " dB" : ""); | |
391 | case IIO_VAL_INT_PLUS_NANO: | |
71646e2c MH |
392 | if (val2 < 0) |
393 | return sprintf(buf, "-%d.%09u\n", val, -val2); | |
394 | else | |
395 | return sprintf(buf, "%d.%09u\n", val, val2); | |
7985e7c1 LPC |
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); | |
103d9fb9 LPC |
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); | |
67eedba3 | 406 | default: |
1d892719 | 407 | return 0; |
67eedba3 | 408 | } |
1d892719 JC |
409 | } |
410 | ||
6807d721 LPC |
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 | ||
1d892719 JC |
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 | { | |
e53f5ac5 | 474 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719 | 475 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
6807d721 LPC |
476 | int ret, fract_mult = 100000; |
477 | int integer, fract; | |
1d892719 JC |
478 | |
479 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 480 | if (!indio_dev->info->write_raw) |
1d892719 | 481 | return -EINVAL; |
5c04af04 MH |
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 | ||
6807d721 LPC |
496 | ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract); |
497 | if (ret) | |
498 | return ret; | |
1d892719 | 499 | |
6fe8135f | 500 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 501 | integer, fract, this_attr->address); |
1d892719 JC |
502 | if (ret) |
503 | return ret; | |
504 | ||
505 | return len; | |
506 | } | |
507 | ||
df9c1c42 | 508 | static |
1d892719 JC |
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); | |
1d892719 | 524 | |
ade7ef7b | 525 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
0403e0d6 | 526 | if (chan->modified && !generic) { |
ade7ef7b JC |
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 | } | |
1d892719 | 551 | |
4abf6f8b | 552 | if (chan->differential) { /* Differential can not have modifier */ |
ade7ef7b JC |
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 | } | |
1d892719 JC |
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 | ||
df9c1c42 | 630 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
631 | { |
632 | kfree(dev_attr->attr.name); | |
633 | } | |
634 | ||
635 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
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), | |
e614a54b | 644 | u64 mask, |
1d892719 JC |
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 | } | |
1d892719 JC |
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 | ||
f8c6f4e9 | 685 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, |
1d892719 JC |
686 | struct iio_chan_spec const *chan) |
687 | { | |
5ccb3adb | 688 | int ret, attrcount = 0; |
75a973c7 | 689 | int i; |
5f420b42 | 690 | const struct iio_chan_spec_ext_info *ext_info; |
1d892719 | 691 | |
1d892719 JC |
692 | if (chan->channel < 0) |
693 | return 0; | |
75a973c7 | 694 | for_each_set_bit(i, &chan->info_mask, sizeof(long)*8) { |
1d892719 | 695 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i/2], |
26d25ae3 | 696 | chan, |
1d892719 JC |
697 | &iio_read_channel_info, |
698 | &iio_write_channel_info, | |
c8a9f805 | 699 | i/2, |
1d892719 | 700 | !(i%2), |
f8c6f4e9 JC |
701 | &indio_dev->dev, |
702 | &indio_dev->channel_attr_list); | |
1d892719 JC |
703 | if (ret == -EBUSY && (i%2 == 0)) { |
704 | ret = 0; | |
705 | continue; | |
706 | } | |
707 | if (ret < 0) | |
708 | goto error_ret; | |
26d25ae3 | 709 | attrcount++; |
1d892719 | 710 | } |
5f420b42 LPC |
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 | ||
26d25ae3 | 736 | ret = attrcount; |
1d892719 JC |
737 | error_ret: |
738 | return ret; | |
739 | } | |
740 | ||
f8c6f4e9 | 741 | static void iio_device_remove_and_free_read_attr(struct iio_dev *indio_dev, |
1d892719 JC |
742 | struct iio_dev_attr *p) |
743 | { | |
1d892719 JC |
744 | kfree(p->dev_attr.attr.name); |
745 | kfree(p); | |
746 | } | |
747 | ||
1b732888 JC |
748 | static ssize_t iio_show_dev_name(struct device *dev, |
749 | struct device_attribute *attr, | |
750 | char *buf) | |
751 | { | |
e53f5ac5 | 752 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1b732888 JC |
753 | return sprintf(buf, "%s\n", indio_dev->name); |
754 | } | |
755 | ||
756 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
757 | ||
f8c6f4e9 | 758 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 759 | { |
26d25ae3 | 760 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
1d892719 | 761 | struct iio_dev_attr *p, *n; |
26d25ae3 | 762 | struct attribute **attr; |
1d892719 | 763 | |
26d25ae3 | 764 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
765 | if (indio_dev->info->attrs) { |
766 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
767 | while (*attr++ != NULL) |
768 | attrcount_orig++; | |
847ec80b | 769 | } |
26d25ae3 | 770 | attrcount = attrcount_orig; |
1d892719 JC |
771 | /* |
772 | * New channel registration method - relies on the fact a group does | |
d25b3808 | 773 | * not need to be initialized if its name is NULL. |
1d892719 | 774 | */ |
f8c6f4e9 JC |
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 | |
1d892719 JC |
779 | ->channels[i]); |
780 | if (ret < 0) | |
781 | goto error_clear_attrs; | |
26d25ae3 | 782 | attrcount += ret; |
1d892719 | 783 | } |
26d25ae3 | 784 | |
f8c6f4e9 | 785 | if (indio_dev->name) |
26d25ae3 JC |
786 | attrcount++; |
787 | ||
d83fb184 TM |
788 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
789 | sizeof(indio_dev->chan_attr_group.attrs[0]), | |
790 | GFP_KERNEL); | |
f8c6f4e9 | 791 | if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3 JC |
792 | ret = -ENOMEM; |
793 | goto error_clear_attrs; | |
1b732888 | 794 | } |
26d25ae3 | 795 | /* Copy across original attributes */ |
f8c6f4e9 JC |
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]) | |
26d25ae3 JC |
800 | *attrcount_orig); |
801 | attrn = attrcount_orig; | |
802 | /* Add all elements from the list. */ | |
f8c6f4e9 JC |
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; | |
26d25ae3 | 807 | |
f8c6f4e9 JC |
808 | indio_dev->groups[indio_dev->groupcounter++] = |
809 | &indio_dev->chan_attr_group; | |
26d25ae3 | 810 | |
1d892719 | 811 | return 0; |
1b732888 | 812 | |
1d892719 JC |
813 | error_clear_attrs: |
814 | list_for_each_entry_safe(p, n, | |
f8c6f4e9 | 815 | &indio_dev->channel_attr_list, l) { |
1d892719 | 816 | list_del(&p->l); |
f8c6f4e9 | 817 | iio_device_remove_and_free_read_attr(indio_dev, p); |
1d892719 | 818 | } |
1d892719 | 819 | |
26d25ae3 | 820 | return ret; |
847ec80b JC |
821 | } |
822 | ||
f8c6f4e9 | 823 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 824 | { |
1d892719 JC |
825 | |
826 | struct iio_dev_attr *p, *n; | |
26d25ae3 | 827 | |
f8c6f4e9 | 828 | list_for_each_entry_safe(p, n, &indio_dev->channel_attr_list, l) { |
1d892719 | 829 | list_del(&p->l); |
f8c6f4e9 | 830 | iio_device_remove_and_free_read_attr(indio_dev, p); |
1d892719 | 831 | } |
f8c6f4e9 | 832 | kfree(indio_dev->chan_attr_group.attrs); |
847ec80b JC |
833 | } |
834 | ||
847ec80b JC |
835 | static void iio_dev_release(struct device *device) |
836 | { | |
e53f5ac5 | 837 | struct iio_dev *indio_dev = dev_to_iio_dev(device); |
e407fd65 LPC |
838 | if (indio_dev->chrdev.dev) |
839 | cdev_del(&indio_dev->chrdev); | |
f8c6f4e9 JC |
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); | |
e553f182 | 844 | iio_device_unregister_debugfs(indio_dev); |
e407fd65 LPC |
845 | |
846 | ida_simple_remove(&iio_ida, indio_dev->id); | |
847 | kfree(indio_dev); | |
847ec80b JC |
848 | } |
849 | ||
850 | static struct device_type iio_dev_type = { | |
851 | .name = "iio_device", | |
852 | .release = iio_dev_release, | |
853 | }; | |
854 | ||
7cbb7537 | 855 | struct iio_dev *iio_device_alloc(int sizeof_priv) |
847ec80b | 856 | { |
6f7c8ee5 JC |
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); | |
847ec80b JC |
869 | |
870 | if (dev) { | |
26d25ae3 | 871 | dev->dev.groups = dev->groups; |
847ec80b | 872 | dev->dev.type = &iio_dev_type; |
5aaaeba8 | 873 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
874 | device_initialize(&dev->dev); |
875 | dev_set_drvdata(&dev->dev, (void *)dev); | |
876 | mutex_init(&dev->mlock); | |
ac917a81 | 877 | mutex_init(&dev->info_exist_lock); |
e407fd65 | 878 | INIT_LIST_HEAD(&dev->channel_attr_list); |
a9e39f9e JC |
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); | |
84b36ce5 | 888 | INIT_LIST_HEAD(&dev->buffer_list); |
847ec80b JC |
889 | } |
890 | ||
891 | return dev; | |
892 | } | |
7cbb7537 | 893 | EXPORT_SYMBOL(iio_device_alloc); |
847ec80b | 894 | |
7cbb7537 | 895 | void iio_device_free(struct iio_dev *dev) |
847ec80b | 896 | { |
e407fd65 LPC |
897 | if (dev) |
898 | put_device(&dev->dev); | |
847ec80b | 899 | } |
7cbb7537 | 900 | EXPORT_SYMBOL(iio_device_free); |
847ec80b | 901 | |
1aa04278 | 902 | /** |
14555b14 | 903 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
1aa04278 JC |
904 | **/ |
905 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
906 | { | |
f8c6f4e9 | 907 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 908 | struct iio_dev, chrdev); |
bb01443e LPC |
909 | |
910 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
911 | return -EBUSY; | |
912 | ||
f8c6f4e9 | 913 | filp->private_data = indio_dev; |
30eb82f0 | 914 | |
79335140 | 915 | return 0; |
1aa04278 JC |
916 | } |
917 | ||
918 | /** | |
14555b14 | 919 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
1aa04278 JC |
920 | **/ |
921 | static int iio_chrdev_release(struct inode *inode, struct file *filp) | |
922 | { | |
bb01443e LPC |
923 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
924 | struct iio_dev, chrdev); | |
bb01443e | 925 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
1aa04278 JC |
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 | ||
14555b14 JC |
946 | static const struct file_operations iio_buffer_fileops = { |
947 | .read = iio_buffer_read_first_n_outer_addr, | |
1aa04278 JC |
948 | .release = iio_chrdev_release, |
949 | .open = iio_chrdev_open, | |
14555b14 | 950 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
951 | .owner = THIS_MODULE, |
952 | .llseek = noop_llseek, | |
953 | .unlocked_ioctl = iio_ioctl, | |
954 | .compat_ioctl = iio_ioctl, | |
955 | }; | |
956 | ||
0f1acee5 MH |
957 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
958 | ||
f8c6f4e9 | 959 | int iio_device_register(struct iio_dev *indio_dev) |
847ec80b JC |
960 | { |
961 | int ret; | |
962 | ||
1aa04278 | 963 | /* configure elements for the chrdev */ |
f8c6f4e9 | 964 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 965 | |
e553f182 MH |
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 | } | |
f8c6f4e9 | 972 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 973 | if (ret) { |
f8c6f4e9 | 974 | dev_err(indio_dev->dev.parent, |
847ec80b | 975 | "Failed to register sysfs interfaces\n"); |
e553f182 | 976 | goto error_unreg_debugfs; |
847ec80b | 977 | } |
f8c6f4e9 | 978 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 979 | if (ret) { |
f8c6f4e9 | 980 | dev_err(indio_dev->dev.parent, |
c849d253 | 981 | "Failed to register event set\n"); |
847ec80b JC |
982 | goto error_free_sysfs; |
983 | } | |
f8c6f4e9 JC |
984 | if (indio_dev->modes & INDIO_BUFFER_TRIGGERED) |
985 | iio_device_register_trigger_consumer(indio_dev); | |
847ec80b | 986 | |
0f1acee5 MH |
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 | ||
f8c6f4e9 | 991 | ret = device_add(&indio_dev->dev); |
26d25ae3 JC |
992 | if (ret < 0) |
993 | goto error_unreg_eventset; | |
f8c6f4e9 JC |
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); | |
26d25ae3 JC |
997 | if (ret < 0) |
998 | goto error_del_device; | |
847ec80b JC |
999 | return 0; |
1000 | ||
847ec80b | 1001 | error_del_device: |
f8c6f4e9 | 1002 | device_del(&indio_dev->dev); |
26d25ae3 | 1003 | error_unreg_eventset: |
f8c6f4e9 | 1004 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 1005 | error_free_sysfs: |
f8c6f4e9 | 1006 | iio_device_unregister_sysfs(indio_dev); |
e553f182 MH |
1007 | error_unreg_debugfs: |
1008 | iio_device_unregister_debugfs(indio_dev); | |
847ec80b JC |
1009 | error_ret: |
1010 | return ret; | |
1011 | } | |
1012 | EXPORT_SYMBOL(iio_device_register); | |
1013 | ||
f8c6f4e9 | 1014 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 1015 | { |
ac917a81 JC |
1016 | mutex_lock(&indio_dev->info_exist_lock); |
1017 | indio_dev->info = NULL; | |
1018 | mutex_unlock(&indio_dev->info_exist_lock); | |
e407fd65 | 1019 | device_del(&indio_dev->dev); |
847ec80b JC |
1020 | } |
1021 | EXPORT_SYMBOL(iio_device_unregister); | |
847ec80b JC |
1022 | subsys_initcall(iio_init); |
1023 | module_exit(iio_exit); | |
1024 | ||
c8b95952 | 1025 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
847ec80b JC |
1026 | MODULE_DESCRIPTION("Industrial I/O core"); |
1027 | MODULE_LICENSE("GPL"); |