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 | ||
3176dd5d SK |
12 | #define pr_fmt(fmt) "iio-core: " fmt |
13 | ||
847ec80b JC |
14 | #include <linux/kernel.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/idr.h> | |
17 | #include <linux/kdev_t.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/fs.h> | |
847ec80b | 21 | #include <linux/poll.h> |
ffc18afa | 22 | #include <linux/sched.h> |
4439c935 | 23 | #include <linux/wait.h> |
847ec80b | 24 | #include <linux/cdev.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
8e7d9672 | 26 | #include <linux/anon_inodes.h> |
e553f182 | 27 | #include <linux/debugfs.h> |
06458e27 | 28 | #include <linux/iio/iio.h> |
df9c1c42 | 29 | #include "iio_core.h" |
6aea1c36 | 30 | #include "iio_core_trigger.h" |
06458e27 JC |
31 | #include <linux/iio/sysfs.h> |
32 | #include <linux/iio/events.h> | |
9e69c935 | 33 | #include <linux/iio/buffer.h> |
9dd1cb30 | 34 | |
99698b45 | 35 | /* IDA to assign each registered device a unique id */ |
b156cf70 | 36 | static DEFINE_IDA(iio_ida); |
847ec80b | 37 | |
f625cb97 | 38 | static dev_t iio_devt; |
847ec80b JC |
39 | |
40 | #define IIO_DEV_MAX 256 | |
5aaaeba8 | 41 | struct bus_type iio_bus_type = { |
847ec80b | 42 | .name = "iio", |
847ec80b | 43 | }; |
5aaaeba8 | 44 | EXPORT_SYMBOL(iio_bus_type); |
847ec80b | 45 | |
e553f182 MH |
46 | static struct dentry *iio_debugfs_dentry; |
47 | ||
c6fc8062 JC |
48 | static const char * const iio_direction[] = { |
49 | [0] = "in", | |
50 | [1] = "out", | |
51 | }; | |
52 | ||
ade7ef7b | 53 | static const char * const iio_chan_type_name_spec[] = { |
c6fc8062 | 54 | [IIO_VOLTAGE] = "voltage", |
faf290e8 MH |
55 | [IIO_CURRENT] = "current", |
56 | [IIO_POWER] = "power", | |
9bff02f8 | 57 | [IIO_ACCEL] = "accel", |
41ea040c | 58 | [IIO_ANGL_VEL] = "anglvel", |
1d892719 | 59 | [IIO_MAGN] = "magn", |
9bff02f8 BF |
60 | [IIO_LIGHT] = "illuminance", |
61 | [IIO_INTENSITY] = "intensity", | |
f09f2c81 | 62 | [IIO_PROXIMITY] = "proximity", |
9bff02f8 | 63 | [IIO_TEMP] = "temp", |
1d892719 JC |
64 | [IIO_INCLI] = "incli", |
65 | [IIO_ROT] = "rot", | |
1d892719 | 66 | [IIO_ANGL] = "angl", |
9bff02f8 | 67 | [IIO_TIMESTAMP] = "timestamp", |
66dbe704 | 68 | [IIO_CAPACITANCE] = "capacitance", |
a6b12855 | 69 | [IIO_ALTVOLTAGE] = "altvoltage", |
21cd1fab | 70 | [IIO_CCT] = "cct", |
c4f0c693 | 71 | [IIO_PRESSURE] = "pressure", |
ac216aa2 | 72 | [IIO_HUMIDITYRELATIVE] = "humidityrelative", |
55aebeb9 | 73 | [IIO_ACTIVITY] = "activity", |
a88bfe78 | 74 | [IIO_STEPS] = "steps", |
72c66644 | 75 | [IIO_ENERGY] = "energy", |
cc3c9eec | 76 | [IIO_DISTANCE] = "distance", |
5a1a9329 | 77 | [IIO_VELOCITY] = "velocity", |
8ff6b3bc | 78 | [IIO_CONCENTRATION] = "concentration", |
d38d5469 | 79 | [IIO_RESISTANCE] = "resistance", |
1d892719 JC |
80 | }; |
81 | ||
330c6c57 | 82 | static const char * const iio_modifier_names[] = { |
1d892719 JC |
83 | [IIO_MOD_X] = "x", |
84 | [IIO_MOD_Y] = "y", | |
85 | [IIO_MOD_Z] = "z", | |
4b8d8015 PM |
86 | [IIO_MOD_X_AND_Y] = "x&y", |
87 | [IIO_MOD_X_AND_Z] = "x&z", | |
88 | [IIO_MOD_Y_AND_Z] = "y&z", | |
89 | [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z", | |
90 | [IIO_MOD_X_OR_Y] = "x|y", | |
91 | [IIO_MOD_X_OR_Z] = "x|z", | |
92 | [IIO_MOD_Y_OR_Z] = "y|z", | |
93 | [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z", | |
8f5879b2 | 94 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", |
cf82cb81 | 95 | [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", |
330c6c57 JC |
96 | [IIO_MOD_LIGHT_BOTH] = "both", |
97 | [IIO_MOD_LIGHT_IR] = "ir", | |
21cd1fab JB |
98 | [IIO_MOD_LIGHT_CLEAR] = "clear", |
99 | [IIO_MOD_LIGHT_RED] = "red", | |
100 | [IIO_MOD_LIGHT_GREEN] = "green", | |
101 | [IIO_MOD_LIGHT_BLUE] = "blue", | |
5082f405 | 102 | [IIO_MOD_QUATERNION] = "quaternion", |
638b43b3 PM |
103 | [IIO_MOD_TEMP_AMBIENT] = "ambient", |
104 | [IIO_MOD_TEMP_OBJECT] = "object", | |
11b8ddab RA |
105 | [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", |
106 | [IIO_MOD_NORTH_TRUE] = "from_north_true", | |
107 | [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", | |
108 | [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", | |
55aebeb9 DB |
109 | [IIO_MOD_RUNNING] = "running", |
110 | [IIO_MOD_JOGGING] = "jogging", | |
111 | [IIO_MOD_WALKING] = "walking", | |
112 | [IIO_MOD_STILL] = "still", | |
5a1a9329 | 113 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", |
1ce87f21 LPC |
114 | [IIO_MOD_I] = "i", |
115 | [IIO_MOD_Q] = "q", | |
8ff6b3bc MR |
116 | [IIO_MOD_CO2] = "co2", |
117 | [IIO_MOD_VOC] = "voc", | |
1d892719 JC |
118 | }; |
119 | ||
120 | /* relies on pairs of these shared then separate */ | |
121 | static const char * const iio_chan_info_postfix[] = { | |
75a973c7 JC |
122 | [IIO_CHAN_INFO_RAW] = "raw", |
123 | [IIO_CHAN_INFO_PROCESSED] = "input", | |
c8a9f805 JC |
124 | [IIO_CHAN_INFO_SCALE] = "scale", |
125 | [IIO_CHAN_INFO_OFFSET] = "offset", | |
126 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", | |
127 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", | |
128 | [IIO_CHAN_INFO_PEAK] = "peak_raw", | |
129 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", | |
130 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", | |
131 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", | |
df94aba8 JC |
132 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
133 | = "filter_low_pass_3db_frequency", | |
3f7f642b MF |
134 | [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY] |
135 | = "filter_high_pass_3db_frequency", | |
ce85a1cb | 136 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", |
a6b12855 MH |
137 | [IIO_CHAN_INFO_FREQUENCY] = "frequency", |
138 | [IIO_CHAN_INFO_PHASE] = "phase", | |
b65d6212 | 139 | [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", |
7c9ab035 | 140 | [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", |
899d90bd | 141 | [IIO_CHAN_INFO_INT_TIME] = "integration_time", |
a88bfe78 | 142 | [IIO_CHAN_INFO_ENABLE] = "en", |
bcdf28fb | 143 | [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight", |
d37f6836 | 144 | [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight", |
2f0ecb7c IT |
145 | [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count", |
146 | [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time", | |
c8a85854 | 147 | [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity", |
faaa4495 | 148 | [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio", |
1d892719 JC |
149 | }; |
150 | ||
a7e57dce SK |
151 | /** |
152 | * iio_find_channel_from_si() - get channel from its scan index | |
153 | * @indio_dev: device | |
154 | * @si: scan index to match | |
155 | */ | |
5fb21c82 JC |
156 | const struct iio_chan_spec |
157 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) | |
158 | { | |
159 | int i; | |
160 | ||
161 | for (i = 0; i < indio_dev->num_channels; i++) | |
162 | if (indio_dev->channels[i].scan_index == si) | |
163 | return &indio_dev->channels[i]; | |
164 | return NULL; | |
165 | } | |
166 | ||
847ec80b JC |
167 | /* This turns up an awful lot */ |
168 | ssize_t iio_read_const_attr(struct device *dev, | |
169 | struct device_attribute *attr, | |
170 | char *buf) | |
171 | { | |
172 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
173 | } | |
174 | EXPORT_SYMBOL(iio_read_const_attr); | |
175 | ||
847ec80b JC |
176 | static int __init iio_init(void) |
177 | { | |
178 | int ret; | |
179 | ||
5aaaeba8 JC |
180 | /* Register sysfs bus */ |
181 | ret = bus_register(&iio_bus_type); | |
847ec80b | 182 | if (ret < 0) { |
3176dd5d | 183 | pr_err("could not register bus type\n"); |
847ec80b JC |
184 | goto error_nothing; |
185 | } | |
186 | ||
9aa1a167 JC |
187 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
188 | if (ret < 0) { | |
3176dd5d | 189 | pr_err("failed to allocate char dev region\n"); |
5aaaeba8 | 190 | goto error_unregister_bus_type; |
9aa1a167 | 191 | } |
847ec80b | 192 | |
e553f182 MH |
193 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
194 | ||
847ec80b JC |
195 | return 0; |
196 | ||
5aaaeba8 JC |
197 | error_unregister_bus_type: |
198 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
199 | error_nothing: |
200 | return ret; | |
201 | } | |
202 | ||
203 | static void __exit iio_exit(void) | |
204 | { | |
9aa1a167 JC |
205 | if (iio_devt) |
206 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 207 | bus_unregister(&iio_bus_type); |
e553f182 MH |
208 | debugfs_remove(iio_debugfs_dentry); |
209 | } | |
210 | ||
211 | #if defined(CONFIG_DEBUG_FS) | |
e553f182 MH |
212 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
213 | size_t count, loff_t *ppos) | |
214 | { | |
215 | struct iio_dev *indio_dev = file->private_data; | |
216 | char buf[20]; | |
217 | unsigned val = 0; | |
218 | ssize_t len; | |
219 | int ret; | |
220 | ||
221 | ret = indio_dev->info->debugfs_reg_access(indio_dev, | |
222 | indio_dev->cached_reg_addr, | |
223 | 0, &val); | |
224 | if (ret) | |
225 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); | |
226 | ||
227 | len = snprintf(buf, sizeof(buf), "0x%X\n", val); | |
228 | ||
229 | return simple_read_from_buffer(userbuf, count, ppos, buf, len); | |
230 | } | |
231 | ||
232 | static ssize_t iio_debugfs_write_reg(struct file *file, | |
233 | const char __user *userbuf, size_t count, loff_t *ppos) | |
234 | { | |
235 | struct iio_dev *indio_dev = file->private_data; | |
236 | unsigned reg, val; | |
237 | char buf[80]; | |
238 | int ret; | |
239 | ||
240 | count = min_t(size_t, count, (sizeof(buf)-1)); | |
241 | if (copy_from_user(buf, userbuf, count)) | |
242 | return -EFAULT; | |
243 | ||
244 | buf[count] = 0; | |
245 | ||
246 | ret = sscanf(buf, "%i %i", ®, &val); | |
247 | ||
248 | switch (ret) { | |
249 | case 1: | |
250 | indio_dev->cached_reg_addr = reg; | |
251 | break; | |
252 | case 2: | |
253 | indio_dev->cached_reg_addr = reg; | |
254 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, | |
255 | val, NULL); | |
256 | if (ret) { | |
257 | dev_err(indio_dev->dev.parent, "%s: write failed\n", | |
258 | __func__); | |
259 | return ret; | |
260 | } | |
261 | break; | |
262 | default: | |
263 | return -EINVAL; | |
264 | } | |
265 | ||
266 | return count; | |
267 | } | |
268 | ||
269 | static const struct file_operations iio_debugfs_reg_fops = { | |
5a28c873 | 270 | .open = simple_open, |
e553f182 MH |
271 | .read = iio_debugfs_read_reg, |
272 | .write = iio_debugfs_write_reg, | |
273 | }; | |
274 | ||
275 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
276 | { | |
277 | debugfs_remove_recursive(indio_dev->debugfs_dentry); | |
847ec80b JC |
278 | } |
279 | ||
e553f182 MH |
280 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
281 | { | |
282 | struct dentry *d; | |
283 | ||
284 | if (indio_dev->info->debugfs_reg_access == NULL) | |
285 | return 0; | |
286 | ||
abd5a2fb | 287 | if (!iio_debugfs_dentry) |
e553f182 MH |
288 | return 0; |
289 | ||
290 | indio_dev->debugfs_dentry = | |
291 | debugfs_create_dir(dev_name(&indio_dev->dev), | |
292 | iio_debugfs_dentry); | |
e553f182 MH |
293 | if (indio_dev->debugfs_dentry == NULL) { |
294 | dev_warn(indio_dev->dev.parent, | |
295 | "Failed to create debugfs directory\n"); | |
296 | return -EFAULT; | |
297 | } | |
298 | ||
299 | d = debugfs_create_file("direct_reg_access", 0644, | |
300 | indio_dev->debugfs_dentry, | |
301 | indio_dev, &iio_debugfs_reg_fops); | |
302 | if (!d) { | |
303 | iio_device_unregister_debugfs(indio_dev); | |
304 | return -ENOMEM; | |
305 | } | |
306 | ||
307 | return 0; | |
308 | } | |
309 | #else | |
310 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) | |
311 | { | |
312 | return 0; | |
313 | } | |
314 | ||
315 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
316 | { | |
317 | } | |
318 | #endif /* CONFIG_DEBUG_FS */ | |
319 | ||
4fee7e16 LPC |
320 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
321 | struct device_attribute *attr, | |
322 | char *buf) | |
323 | { | |
e53f5ac5 | 324 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
325 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
326 | const struct iio_chan_spec_ext_info *ext_info; | |
327 | ||
328 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
329 | ||
fc6d1139 | 330 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
4fee7e16 LPC |
331 | } |
332 | ||
333 | static ssize_t iio_write_channel_ext_info(struct device *dev, | |
334 | struct device_attribute *attr, | |
335 | const char *buf, | |
336 | size_t len) | |
337 | { | |
e53f5ac5 | 338 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
339 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
340 | const struct iio_chan_spec_ext_info *ext_info; | |
341 | ||
342 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
343 | ||
fc6d1139 MH |
344 | return ext_info->write(indio_dev, ext_info->private, |
345 | this_attr->c, buf, len); | |
4fee7e16 LPC |
346 | } |
347 | ||
5212cc8a LPC |
348 | ssize_t iio_enum_available_read(struct iio_dev *indio_dev, |
349 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
350 | { | |
351 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
352 | unsigned int i; | |
353 | size_t len = 0; | |
354 | ||
355 | if (!e->num_items) | |
356 | return 0; | |
357 | ||
358 | for (i = 0; i < e->num_items; ++i) | |
74dcd439 | 359 | len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); |
5212cc8a LPC |
360 | |
361 | /* replace last space with a newline */ | |
362 | buf[len - 1] = '\n'; | |
363 | ||
364 | return len; | |
365 | } | |
366 | EXPORT_SYMBOL_GPL(iio_enum_available_read); | |
367 | ||
368 | ssize_t iio_enum_read(struct iio_dev *indio_dev, | |
369 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
370 | { | |
371 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
372 | int i; | |
373 | ||
374 | if (!e->get) | |
375 | return -EINVAL; | |
376 | ||
377 | i = e->get(indio_dev, chan); | |
378 | if (i < 0) | |
379 | return i; | |
380 | else if (i >= e->num_items) | |
381 | return -EINVAL; | |
382 | ||
598db581 | 383 | return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]); |
5212cc8a LPC |
384 | } |
385 | EXPORT_SYMBOL_GPL(iio_enum_read); | |
386 | ||
387 | ssize_t iio_enum_write(struct iio_dev *indio_dev, | |
388 | uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, | |
389 | size_t len) | |
390 | { | |
391 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
392 | unsigned int i; | |
393 | int ret; | |
394 | ||
395 | if (!e->set) | |
396 | return -EINVAL; | |
397 | ||
398 | for (i = 0; i < e->num_items; i++) { | |
399 | if (sysfs_streq(buf, e->items[i])) | |
400 | break; | |
401 | } | |
402 | ||
403 | if (i == e->num_items) | |
404 | return -EINVAL; | |
405 | ||
406 | ret = e->set(indio_dev, chan, i); | |
407 | return ret ? ret : len; | |
408 | } | |
409 | EXPORT_SYMBOL_GPL(iio_enum_write); | |
410 | ||
3661f3f5 LPC |
411 | /** |
412 | * iio_format_value() - Formats a IIO value into its string representation | |
2498dcf6 CO |
413 | * @buf: The buffer to which the formatted value gets written |
414 | * @type: One of the IIO_VAL_... constants. This decides how the val | |
415 | * and val2 parameters are formatted. | |
416 | * @size: Number of IIO value entries contained in vals | |
417 | * @vals: Pointer to the values, exact meaning depends on the | |
418 | * type parameter. | |
419 | * | |
420 | * Return: 0 by default, a negative number on failure or the | |
421 | * total number of characters written for a type that belongs | |
422 | * to the IIO_VAL_... constant. | |
3661f3f5 | 423 | */ |
9fbfb4b3 | 424 | ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) |
847ec80b | 425 | { |
7985e7c1 | 426 | unsigned long long tmp; |
67eedba3 | 427 | bool scale_db = false; |
1d892719 | 428 | |
3661f3f5 | 429 | switch (type) { |
67eedba3 | 430 | case IIO_VAL_INT: |
9fbfb4b3 | 431 | return sprintf(buf, "%d\n", vals[0]); |
67eedba3 MH |
432 | case IIO_VAL_INT_PLUS_MICRO_DB: |
433 | scale_db = true; | |
434 | case IIO_VAL_INT_PLUS_MICRO: | |
9fbfb4b3 SP |
435 | if (vals[1] < 0) |
436 | return sprintf(buf, "-%ld.%06u%s\n", abs(vals[0]), | |
437 | -vals[1], | |
67eedba3 | 438 | scale_db ? " dB" : ""); |
1d892719 | 439 | else |
9fbfb4b3 | 440 | return sprintf(buf, "%d.%06u%s\n", vals[0], vals[1], |
67eedba3 MH |
441 | scale_db ? " dB" : ""); |
442 | case IIO_VAL_INT_PLUS_NANO: | |
9fbfb4b3 SP |
443 | if (vals[1] < 0) |
444 | return sprintf(buf, "-%ld.%09u\n", abs(vals[0]), | |
445 | -vals[1]); | |
71646e2c | 446 | else |
9fbfb4b3 | 447 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); |
7985e7c1 | 448 | case IIO_VAL_FRACTIONAL: |
9fbfb4b3 SP |
449 | tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]); |
450 | vals[1] = do_div(tmp, 1000000000LL); | |
451 | vals[0] = tmp; | |
452 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); | |
103d9fb9 | 453 | case IIO_VAL_FRACTIONAL_LOG2: |
9fbfb4b3 SP |
454 | tmp = (s64)vals[0] * 1000000000LL >> vals[1]; |
455 | vals[1] = do_div(tmp, 1000000000LL); | |
456 | vals[0] = tmp; | |
457 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); | |
458 | case IIO_VAL_INT_MULTIPLE: | |
459 | { | |
460 | int i; | |
461 | int len = 0; | |
462 | ||
463 | for (i = 0; i < size; ++i) | |
464 | len += snprintf(&buf[len], PAGE_SIZE - len, "%d ", | |
465 | vals[i]); | |
466 | len += snprintf(&buf[len], PAGE_SIZE - len, "\n"); | |
467 | return len; | |
468 | } | |
67eedba3 | 469 | default: |
1d892719 | 470 | return 0; |
67eedba3 | 471 | } |
1d892719 JC |
472 | } |
473 | ||
3661f3f5 LPC |
474 | static ssize_t iio_read_channel_info(struct device *dev, |
475 | struct device_attribute *attr, | |
476 | char *buf) | |
477 | { | |
478 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
479 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
9fbfb4b3 SP |
480 | int vals[INDIO_MAX_RAW_ELEMENTS]; |
481 | int ret; | |
482 | int val_len = 2; | |
483 | ||
484 | if (indio_dev->info->read_raw_multi) | |
485 | ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c, | |
486 | INDIO_MAX_RAW_ELEMENTS, | |
487 | vals, &val_len, | |
488 | this_attr->address); | |
489 | else | |
490 | ret = indio_dev->info->read_raw(indio_dev, this_attr->c, | |
491 | &vals[0], &vals[1], this_attr->address); | |
3661f3f5 LPC |
492 | |
493 | if (ret < 0) | |
494 | return ret; | |
495 | ||
9fbfb4b3 | 496 | return iio_format_value(buf, ret, val_len, vals); |
3661f3f5 LPC |
497 | } |
498 | ||
6807d721 LPC |
499 | /** |
500 | * iio_str_to_fixpoint() - Parse a fixed-point number from a string | |
501 | * @str: The string to parse | |
502 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 | |
503 | * @integer: The integer part of the number | |
504 | * @fract: The fractional part of the number | |
505 | * | |
506 | * Returns 0 on success, or a negative error code if the string could not be | |
507 | * parsed. | |
508 | */ | |
509 | int iio_str_to_fixpoint(const char *str, int fract_mult, | |
510 | int *integer, int *fract) | |
511 | { | |
512 | int i = 0, f = 0; | |
513 | bool integer_part = true, negative = false; | |
514 | ||
515 | if (str[0] == '-') { | |
516 | negative = true; | |
517 | str++; | |
518 | } else if (str[0] == '+') { | |
519 | str++; | |
520 | } | |
521 | ||
522 | while (*str) { | |
523 | if ('0' <= *str && *str <= '9') { | |
524 | if (integer_part) { | |
525 | i = i * 10 + *str - '0'; | |
526 | } else { | |
527 | f += fract_mult * (*str - '0'); | |
528 | fract_mult /= 10; | |
529 | } | |
530 | } else if (*str == '\n') { | |
531 | if (*(str + 1) == '\0') | |
532 | break; | |
533 | else | |
534 | return -EINVAL; | |
535 | } else if (*str == '.' && integer_part) { | |
536 | integer_part = false; | |
537 | } else { | |
538 | return -EINVAL; | |
539 | } | |
540 | str++; | |
541 | } | |
542 | ||
543 | if (negative) { | |
544 | if (i) | |
545 | i = -i; | |
546 | else | |
547 | f = -f; | |
548 | } | |
549 | ||
550 | *integer = i; | |
551 | *fract = f; | |
552 | ||
553 | return 0; | |
554 | } | |
555 | EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); | |
556 | ||
1d892719 JC |
557 | static ssize_t iio_write_channel_info(struct device *dev, |
558 | struct device_attribute *attr, | |
559 | const char *buf, | |
560 | size_t len) | |
561 | { | |
e53f5ac5 | 562 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719 | 563 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
6807d721 LPC |
564 | int ret, fract_mult = 100000; |
565 | int integer, fract; | |
1d892719 JC |
566 | |
567 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 568 | if (!indio_dev->info->write_raw) |
1d892719 | 569 | return -EINVAL; |
5c04af04 MH |
570 | |
571 | if (indio_dev->info->write_raw_get_fmt) | |
572 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, | |
573 | this_attr->c, this_attr->address)) { | |
574 | case IIO_VAL_INT_PLUS_MICRO: | |
575 | fract_mult = 100000; | |
576 | break; | |
577 | case IIO_VAL_INT_PLUS_NANO: | |
578 | fract_mult = 100000000; | |
579 | break; | |
580 | default: | |
581 | return -EINVAL; | |
582 | } | |
583 | ||
6807d721 LPC |
584 | ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract); |
585 | if (ret) | |
586 | return ret; | |
1d892719 | 587 | |
6fe8135f | 588 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 589 | integer, fract, this_attr->address); |
1d892719 JC |
590 | if (ret) |
591 | return ret; | |
592 | ||
593 | return len; | |
594 | } | |
595 | ||
df9c1c42 | 596 | static |
1d892719 JC |
597 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
598 | const char *postfix, | |
599 | struct iio_chan_spec const *chan, | |
600 | ssize_t (*readfunc)(struct device *dev, | |
601 | struct device_attribute *attr, | |
602 | char *buf), | |
603 | ssize_t (*writefunc)(struct device *dev, | |
604 | struct device_attribute *attr, | |
605 | const char *buf, | |
606 | size_t len), | |
3704432f | 607 | enum iio_shared_by shared_by) |
1d892719 | 608 | { |
3704432f | 609 | int ret = 0; |
7bbcf7e1 | 610 | char *name = NULL; |
3704432f | 611 | char *full_postfix; |
1d892719 | 612 | sysfs_attr_init(&dev_attr->attr); |
1d892719 | 613 | |
ade7ef7b | 614 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
3704432f | 615 | if (chan->modified && (shared_by == IIO_SEPARATE)) { |
ade7ef7b JC |
616 | if (chan->extend_name) |
617 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
618 | iio_modifier_names[chan | |
619 | ->channel2], | |
620 | chan->extend_name, | |
621 | postfix); | |
622 | else | |
623 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
624 | iio_modifier_names[chan | |
625 | ->channel2], | |
626 | postfix); | |
627 | } else { | |
77bfa8ba | 628 | if (chan->extend_name == NULL || shared_by != IIO_SEPARATE) |
ade7ef7b JC |
629 | full_postfix = kstrdup(postfix, GFP_KERNEL); |
630 | else | |
631 | full_postfix = kasprintf(GFP_KERNEL, | |
632 | "%s_%s", | |
633 | chan->extend_name, | |
634 | postfix); | |
635 | } | |
3704432f JC |
636 | if (full_postfix == NULL) |
637 | return -ENOMEM; | |
1d892719 | 638 | |
4abf6f8b | 639 | if (chan->differential) { /* Differential can not have modifier */ |
3704432f | 640 | switch (shared_by) { |
c006ec83 | 641 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 642 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
643 | break; |
644 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 645 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
646 | iio_direction[chan->output], |
647 | full_postfix); | |
648 | break; | |
3704432f | 649 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 650 | name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", |
ade7ef7b JC |
651 | iio_direction[chan->output], |
652 | iio_chan_type_name_spec[chan->type], | |
653 | iio_chan_type_name_spec[chan->type], | |
654 | full_postfix); | |
3704432f JC |
655 | break; |
656 | case IIO_SEPARATE: | |
657 | if (!chan->indexed) { | |
658 | WARN_ON("Differential channels must be indexed\n"); | |
659 | ret = -EINVAL; | |
660 | goto error_free_full_postfix; | |
661 | } | |
7bbcf7e1 | 662 | name = kasprintf(GFP_KERNEL, |
3704432f | 663 | "%s_%s%d-%s%d_%s", |
ade7ef7b JC |
664 | iio_direction[chan->output], |
665 | iio_chan_type_name_spec[chan->type], | |
666 | chan->channel, | |
667 | iio_chan_type_name_spec[chan->type], | |
668 | chan->channel2, | |
669 | full_postfix); | |
3704432f | 670 | break; |
ade7ef7b JC |
671 | } |
672 | } else { /* Single ended */ | |
3704432f | 673 | switch (shared_by) { |
c006ec83 | 674 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 675 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
676 | break; |
677 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 678 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
679 | iio_direction[chan->output], |
680 | full_postfix); | |
681 | break; | |
3704432f | 682 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 683 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
ade7ef7b JC |
684 | iio_direction[chan->output], |
685 | iio_chan_type_name_spec[chan->type], | |
686 | full_postfix); | |
3704432f JC |
687 | break; |
688 | ||
689 | case IIO_SEPARATE: | |
690 | if (chan->indexed) | |
7bbcf7e1 | 691 | name = kasprintf(GFP_KERNEL, "%s_%s%d_%s", |
3704432f JC |
692 | iio_direction[chan->output], |
693 | iio_chan_type_name_spec[chan->type], | |
694 | chan->channel, | |
695 | full_postfix); | |
696 | else | |
7bbcf7e1 | 697 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
3704432f JC |
698 | iio_direction[chan->output], |
699 | iio_chan_type_name_spec[chan->type], | |
700 | full_postfix); | |
701 | break; | |
702 | } | |
ade7ef7b | 703 | } |
7bbcf7e1 | 704 | if (name == NULL) { |
1d892719 JC |
705 | ret = -ENOMEM; |
706 | goto error_free_full_postfix; | |
707 | } | |
7bbcf7e1 | 708 | dev_attr->attr.name = name; |
1d892719 JC |
709 | |
710 | if (readfunc) { | |
711 | dev_attr->attr.mode |= S_IRUGO; | |
712 | dev_attr->show = readfunc; | |
713 | } | |
714 | ||
715 | if (writefunc) { | |
716 | dev_attr->attr.mode |= S_IWUSR; | |
717 | dev_attr->store = writefunc; | |
718 | } | |
7bbcf7e1 | 719 | |
1d892719 JC |
720 | error_free_full_postfix: |
721 | kfree(full_postfix); | |
3704432f | 722 | |
1d892719 JC |
723 | return ret; |
724 | } | |
725 | ||
df9c1c42 | 726 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
727 | { |
728 | kfree(dev_attr->attr.name); | |
729 | } | |
730 | ||
731 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
732 | struct iio_chan_spec const *chan, |
733 | ssize_t (*readfunc)(struct device *dev, | |
734 | struct device_attribute *attr, | |
735 | char *buf), | |
736 | ssize_t (*writefunc)(struct device *dev, | |
737 | struct device_attribute *attr, | |
738 | const char *buf, | |
739 | size_t len), | |
e614a54b | 740 | u64 mask, |
3704432f | 741 | enum iio_shared_by shared_by, |
1d892719 JC |
742 | struct device *dev, |
743 | struct list_head *attr_list) | |
744 | { | |
745 | int ret; | |
746 | struct iio_dev_attr *iio_attr, *t; | |
747 | ||
670c1103 | 748 | iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL); |
92825ff9 HK |
749 | if (iio_attr == NULL) |
750 | return -ENOMEM; | |
1d892719 JC |
751 | ret = __iio_device_attr_init(&iio_attr->dev_attr, |
752 | postfix, chan, | |
3704432f | 753 | readfunc, writefunc, shared_by); |
1d892719 JC |
754 | if (ret) |
755 | goto error_iio_dev_attr_free; | |
756 | iio_attr->c = chan; | |
757 | iio_attr->address = mask; | |
758 | list_for_each_entry(t, attr_list, l) | |
759 | if (strcmp(t->dev_attr.attr.name, | |
760 | iio_attr->dev_attr.attr.name) == 0) { | |
3704432f | 761 | if (shared_by == IIO_SEPARATE) |
1d892719 JC |
762 | dev_err(dev, "tried to double register : %s\n", |
763 | t->dev_attr.attr.name); | |
764 | ret = -EBUSY; | |
765 | goto error_device_attr_deinit; | |
766 | } | |
1d892719 JC |
767 | list_add(&iio_attr->l, attr_list); |
768 | ||
769 | return 0; | |
770 | ||
771 | error_device_attr_deinit: | |
772 | __iio_device_attr_deinit(&iio_attr->dev_attr); | |
773 | error_iio_dev_attr_free: | |
774 | kfree(iio_attr); | |
1d892719 JC |
775 | return ret; |
776 | } | |
777 | ||
3704432f JC |
778 | static int iio_device_add_info_mask_type(struct iio_dev *indio_dev, |
779 | struct iio_chan_spec const *chan, | |
780 | enum iio_shared_by shared_by, | |
781 | const long *infomask) | |
1d892719 | 782 | { |
3704432f | 783 | int i, ret, attrcount = 0; |
1d892719 | 784 | |
3704432f | 785 | for_each_set_bit(i, infomask, sizeof(infomask)*8) { |
ef4b4856 JC |
786 | if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
787 | return -EINVAL; | |
8655cc49 JC |
788 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i], |
789 | chan, | |
790 | &iio_read_channel_info, | |
791 | &iio_write_channel_info, | |
792 | i, | |
3704432f | 793 | shared_by, |
8655cc49 JC |
794 | &indio_dev->dev, |
795 | &indio_dev->channel_attr_list); | |
3704432f | 796 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
8655cc49 | 797 | continue; |
3704432f JC |
798 | else if (ret < 0) |
799 | return ret; | |
8655cc49 JC |
800 | attrcount++; |
801 | } | |
5f420b42 | 802 | |
3704432f JC |
803 | return attrcount; |
804 | } | |
805 | ||
806 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, | |
807 | struct iio_chan_spec const *chan) | |
808 | { | |
809 | int ret, attrcount = 0; | |
810 | const struct iio_chan_spec_ext_info *ext_info; | |
811 | ||
812 | if (chan->channel < 0) | |
813 | return 0; | |
814 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
815 | IIO_SEPARATE, | |
816 | &chan->info_mask_separate); | |
817 | if (ret < 0) | |
818 | return ret; | |
819 | attrcount += ret; | |
820 | ||
821 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
822 | IIO_SHARED_BY_TYPE, | |
823 | &chan->info_mask_shared_by_type); | |
824 | if (ret < 0) | |
825 | return ret; | |
826 | attrcount += ret; | |
827 | ||
c006ec83 JC |
828 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
829 | IIO_SHARED_BY_DIR, | |
830 | &chan->info_mask_shared_by_dir); | |
831 | if (ret < 0) | |
832 | return ret; | |
833 | attrcount += ret; | |
834 | ||
835 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
836 | IIO_SHARED_BY_ALL, | |
837 | &chan->info_mask_shared_by_all); | |
838 | if (ret < 0) | |
839 | return ret; | |
840 | attrcount += ret; | |
841 | ||
5f420b42 LPC |
842 | if (chan->ext_info) { |
843 | unsigned int i = 0; | |
844 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { | |
845 | ret = __iio_add_chan_devattr(ext_info->name, | |
846 | chan, | |
847 | ext_info->read ? | |
848 | &iio_read_channel_ext_info : NULL, | |
849 | ext_info->write ? | |
850 | &iio_write_channel_ext_info : NULL, | |
851 | i, | |
852 | ext_info->shared, | |
853 | &indio_dev->dev, | |
854 | &indio_dev->channel_attr_list); | |
855 | i++; | |
856 | if (ret == -EBUSY && ext_info->shared) | |
857 | continue; | |
858 | ||
859 | if (ret) | |
3704432f | 860 | return ret; |
5f420b42 LPC |
861 | |
862 | attrcount++; | |
863 | } | |
864 | } | |
865 | ||
3704432f | 866 | return attrcount; |
1d892719 JC |
867 | } |
868 | ||
84088ebd LPC |
869 | /** |
870 | * iio_free_chan_devattr_list() - Free a list of IIO device attributes | |
871 | * @attr_list: List of IIO device attributes | |
872 | * | |
873 | * This function frees the memory allocated for each of the IIO device | |
c1b03ab5 | 874 | * attributes in the list. |
84088ebd LPC |
875 | */ |
876 | void iio_free_chan_devattr_list(struct list_head *attr_list) | |
1d892719 | 877 | { |
84088ebd LPC |
878 | struct iio_dev_attr *p, *n; |
879 | ||
880 | list_for_each_entry_safe(p, n, attr_list, l) { | |
881 | kfree(p->dev_attr.attr.name); | |
c1b03ab5 | 882 | list_del(&p->l); |
84088ebd LPC |
883 | kfree(p); |
884 | } | |
1d892719 JC |
885 | } |
886 | ||
1b732888 JC |
887 | static ssize_t iio_show_dev_name(struct device *dev, |
888 | struct device_attribute *attr, | |
889 | char *buf) | |
890 | { | |
e53f5ac5 | 891 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
598db581 | 892 | return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name); |
1b732888 JC |
893 | } |
894 | ||
895 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
896 | ||
f8c6f4e9 | 897 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 898 | { |
26d25ae3 | 899 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
84088ebd | 900 | struct iio_dev_attr *p; |
26d25ae3 | 901 | struct attribute **attr; |
1d892719 | 902 | |
26d25ae3 | 903 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
904 | if (indio_dev->info->attrs) { |
905 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
906 | while (*attr++ != NULL) |
907 | attrcount_orig++; | |
847ec80b | 908 | } |
26d25ae3 | 909 | attrcount = attrcount_orig; |
1d892719 JC |
910 | /* |
911 | * New channel registration method - relies on the fact a group does | |
d25b3808 | 912 | * not need to be initialized if its name is NULL. |
1d892719 | 913 | */ |
f8c6f4e9 JC |
914 | if (indio_dev->channels) |
915 | for (i = 0; i < indio_dev->num_channels; i++) { | |
916 | ret = iio_device_add_channel_sysfs(indio_dev, | |
917 | &indio_dev | |
1d892719 JC |
918 | ->channels[i]); |
919 | if (ret < 0) | |
920 | goto error_clear_attrs; | |
26d25ae3 | 921 | attrcount += ret; |
1d892719 | 922 | } |
26d25ae3 | 923 | |
f8c6f4e9 | 924 | if (indio_dev->name) |
26d25ae3 JC |
925 | attrcount++; |
926 | ||
d83fb184 TM |
927 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
928 | sizeof(indio_dev->chan_attr_group.attrs[0]), | |
929 | GFP_KERNEL); | |
f8c6f4e9 | 930 | if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3 JC |
931 | ret = -ENOMEM; |
932 | goto error_clear_attrs; | |
1b732888 | 933 | } |
26d25ae3 | 934 | /* Copy across original attributes */ |
f8c6f4e9 JC |
935 | if (indio_dev->info->attrs) |
936 | memcpy(indio_dev->chan_attr_group.attrs, | |
937 | indio_dev->info->attrs->attrs, | |
938 | sizeof(indio_dev->chan_attr_group.attrs[0]) | |
26d25ae3 JC |
939 | *attrcount_orig); |
940 | attrn = attrcount_orig; | |
941 | /* Add all elements from the list. */ | |
f8c6f4e9 JC |
942 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
943 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; | |
944 | if (indio_dev->name) | |
945 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; | |
26d25ae3 | 946 | |
f8c6f4e9 JC |
947 | indio_dev->groups[indio_dev->groupcounter++] = |
948 | &indio_dev->chan_attr_group; | |
26d25ae3 | 949 | |
1d892719 | 950 | return 0; |
1b732888 | 951 | |
1d892719 | 952 | error_clear_attrs: |
84088ebd | 953 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
1d892719 | 954 | |
26d25ae3 | 955 | return ret; |
847ec80b JC |
956 | } |
957 | ||
f8c6f4e9 | 958 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 959 | { |
1d892719 | 960 | |
84088ebd | 961 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
f8c6f4e9 | 962 | kfree(indio_dev->chan_attr_group.attrs); |
c1b03ab5 | 963 | indio_dev->chan_attr_group.attrs = NULL; |
847ec80b JC |
964 | } |
965 | ||
847ec80b JC |
966 | static void iio_dev_release(struct device *device) |
967 | { | |
e53f5ac5 | 968 | struct iio_dev *indio_dev = dev_to_iio_dev(device); |
735ad074 | 969 | if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED)) |
f8c6f4e9 JC |
970 | iio_device_unregister_trigger_consumer(indio_dev); |
971 | iio_device_unregister_eventset(indio_dev); | |
972 | iio_device_unregister_sysfs(indio_dev); | |
e407fd65 | 973 | |
9e69c935 LPC |
974 | iio_buffer_put(indio_dev->buffer); |
975 | ||
e407fd65 LPC |
976 | ida_simple_remove(&iio_ida, indio_dev->id); |
977 | kfree(indio_dev); | |
847ec80b JC |
978 | } |
979 | ||
17d82b47 | 980 | struct device_type iio_device_type = { |
847ec80b JC |
981 | .name = "iio_device", |
982 | .release = iio_dev_release, | |
983 | }; | |
984 | ||
a7e57dce SK |
985 | /** |
986 | * iio_device_alloc() - allocate an iio_dev from a driver | |
987 | * @sizeof_priv: Space to allocate for private structure. | |
988 | **/ | |
7cbb7537 | 989 | struct iio_dev *iio_device_alloc(int sizeof_priv) |
847ec80b | 990 | { |
6f7c8ee5 JC |
991 | struct iio_dev *dev; |
992 | size_t alloc_size; | |
993 | ||
994 | alloc_size = sizeof(struct iio_dev); | |
995 | if (sizeof_priv) { | |
996 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); | |
997 | alloc_size += sizeof_priv; | |
998 | } | |
999 | /* ensure 32-byte alignment of whole construct ? */ | |
1000 | alloc_size += IIO_ALIGN - 1; | |
1001 | ||
1002 | dev = kzalloc(alloc_size, GFP_KERNEL); | |
847ec80b JC |
1003 | |
1004 | if (dev) { | |
26d25ae3 | 1005 | dev->dev.groups = dev->groups; |
17d82b47 | 1006 | dev->dev.type = &iio_device_type; |
5aaaeba8 | 1007 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
1008 | device_initialize(&dev->dev); |
1009 | dev_set_drvdata(&dev->dev, (void *)dev); | |
1010 | mutex_init(&dev->mlock); | |
ac917a81 | 1011 | mutex_init(&dev->info_exist_lock); |
e407fd65 | 1012 | INIT_LIST_HEAD(&dev->channel_attr_list); |
a9e39f9e JC |
1013 | |
1014 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); | |
1015 | if (dev->id < 0) { | |
1016 | /* cannot use a dev_err as the name isn't available */ | |
3176dd5d | 1017 | pr_err("failed to get device id\n"); |
a9e39f9e JC |
1018 | kfree(dev); |
1019 | return NULL; | |
1020 | } | |
1021 | dev_set_name(&dev->dev, "iio:device%d", dev->id); | |
84b36ce5 | 1022 | INIT_LIST_HEAD(&dev->buffer_list); |
847ec80b JC |
1023 | } |
1024 | ||
1025 | return dev; | |
1026 | } | |
7cbb7537 | 1027 | EXPORT_SYMBOL(iio_device_alloc); |
847ec80b | 1028 | |
a7e57dce SK |
1029 | /** |
1030 | * iio_device_free() - free an iio_dev from a driver | |
1031 | * @dev: the iio_dev associated with the device | |
1032 | **/ | |
7cbb7537 | 1033 | void iio_device_free(struct iio_dev *dev) |
847ec80b | 1034 | { |
e407fd65 LPC |
1035 | if (dev) |
1036 | put_device(&dev->dev); | |
847ec80b | 1037 | } |
7cbb7537 | 1038 | EXPORT_SYMBOL(iio_device_free); |
847ec80b | 1039 | |
9dabaf5e GS |
1040 | static void devm_iio_device_release(struct device *dev, void *res) |
1041 | { | |
1042 | iio_device_free(*(struct iio_dev **)res); | |
1043 | } | |
1044 | ||
1045 | static int devm_iio_device_match(struct device *dev, void *res, void *data) | |
1046 | { | |
1047 | struct iio_dev **r = res; | |
1048 | if (!r || !*r) { | |
1049 | WARN_ON(!r || !*r); | |
1050 | return 0; | |
1051 | } | |
1052 | return *r == data; | |
1053 | } | |
1054 | ||
a7e57dce SK |
1055 | /** |
1056 | * devm_iio_device_alloc - Resource-managed iio_device_alloc() | |
1057 | * @dev: Device to allocate iio_dev for | |
1058 | * @sizeof_priv: Space to allocate for private structure. | |
1059 | * | |
1060 | * Managed iio_device_alloc. iio_dev allocated with this function is | |
1061 | * automatically freed on driver detach. | |
1062 | * | |
1063 | * If an iio_dev allocated with this function needs to be freed separately, | |
1064 | * devm_iio_device_free() must be used. | |
1065 | * | |
1066 | * RETURNS: | |
1067 | * Pointer to allocated iio_dev on success, NULL on failure. | |
1068 | */ | |
9dabaf5e GS |
1069 | struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv) |
1070 | { | |
1071 | struct iio_dev **ptr, *iio_dev; | |
1072 | ||
1073 | ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr), | |
1074 | GFP_KERNEL); | |
1075 | if (!ptr) | |
1076 | return NULL; | |
1077 | ||
9dabaf5e GS |
1078 | iio_dev = iio_device_alloc(sizeof_priv); |
1079 | if (iio_dev) { | |
1080 | *ptr = iio_dev; | |
1081 | devres_add(dev, ptr); | |
1082 | } else { | |
1083 | devres_free(ptr); | |
1084 | } | |
1085 | ||
1086 | return iio_dev; | |
1087 | } | |
1088 | EXPORT_SYMBOL_GPL(devm_iio_device_alloc); | |
1089 | ||
a7e57dce SK |
1090 | /** |
1091 | * devm_iio_device_free - Resource-managed iio_device_free() | |
1092 | * @dev: Device this iio_dev belongs to | |
1093 | * @iio_dev: the iio_dev associated with the device | |
1094 | * | |
1095 | * Free iio_dev allocated with devm_iio_device_alloc(). | |
1096 | */ | |
9dabaf5e GS |
1097 | void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev) |
1098 | { | |
1099 | int rc; | |
1100 | ||
1101 | rc = devres_release(dev, devm_iio_device_release, | |
1102 | devm_iio_device_match, iio_dev); | |
1103 | WARN_ON(rc); | |
1104 | } | |
1105 | EXPORT_SYMBOL_GPL(devm_iio_device_free); | |
1106 | ||
1aa04278 | 1107 | /** |
14555b14 | 1108 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
2498dcf6 CO |
1109 | * @inode: Inode structure for identifying the device in the file system |
1110 | * @filp: File structure for iio device used to keep and later access | |
1111 | * private data | |
1112 | * | |
1113 | * Return: 0 on success or -EBUSY if the device is already opened | |
1aa04278 JC |
1114 | **/ |
1115 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
1116 | { | |
f8c6f4e9 | 1117 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 1118 | struct iio_dev, chrdev); |
bb01443e LPC |
1119 | |
1120 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
1121 | return -EBUSY; | |
1122 | ||
cadc2125 LPC |
1123 | iio_device_get(indio_dev); |
1124 | ||
f8c6f4e9 | 1125 | filp->private_data = indio_dev; |
30eb82f0 | 1126 | |
79335140 | 1127 | return 0; |
1aa04278 JC |
1128 | } |
1129 | ||
1130 | /** | |
14555b14 | 1131 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
2498dcf6 CO |
1132 | * @inode: Inode structure pointer for the char device |
1133 | * @filp: File structure pointer for the char device | |
1134 | * | |
1135 | * Return: 0 for successful release | |
1136 | */ | |
1aa04278 JC |
1137 | static int iio_chrdev_release(struct inode *inode, struct file *filp) |
1138 | { | |
bb01443e LPC |
1139 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1140 | struct iio_dev, chrdev); | |
bb01443e | 1141 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
cadc2125 LPC |
1142 | iio_device_put(indio_dev); |
1143 | ||
1aa04278 JC |
1144 | return 0; |
1145 | } | |
1146 | ||
1147 | /* Somewhat of a cross file organization violation - ioctls here are actually | |
1148 | * event related */ | |
1149 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1150 | { | |
1151 | struct iio_dev *indio_dev = filp->private_data; | |
1152 | int __user *ip = (int __user *)arg; | |
1153 | int fd; | |
1154 | ||
f18e7a06 LPC |
1155 | if (!indio_dev->info) |
1156 | return -ENODEV; | |
1157 | ||
1aa04278 JC |
1158 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { |
1159 | fd = iio_event_getfd(indio_dev); | |
3f9059b7 LW |
1160 | if (fd < 0) |
1161 | return fd; | |
1aa04278 JC |
1162 | if (copy_to_user(ip, &fd, sizeof(fd))) |
1163 | return -EFAULT; | |
1164 | return 0; | |
1165 | } | |
1166 | return -EINVAL; | |
1167 | } | |
1168 | ||
14555b14 JC |
1169 | static const struct file_operations iio_buffer_fileops = { |
1170 | .read = iio_buffer_read_first_n_outer_addr, | |
1aa04278 JC |
1171 | .release = iio_chrdev_release, |
1172 | .open = iio_chrdev_open, | |
14555b14 | 1173 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
1174 | .owner = THIS_MODULE, |
1175 | .llseek = noop_llseek, | |
1176 | .unlocked_ioctl = iio_ioctl, | |
1177 | .compat_ioctl = iio_ioctl, | |
1178 | }; | |
1179 | ||
8f5d8727 VD |
1180 | static int iio_check_unique_scan_index(struct iio_dev *indio_dev) |
1181 | { | |
1182 | int i, j; | |
1183 | const struct iio_chan_spec *channels = indio_dev->channels; | |
1184 | ||
1185 | if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES)) | |
1186 | return 0; | |
1187 | ||
1188 | for (i = 0; i < indio_dev->num_channels - 1; i++) { | |
1189 | if (channels[i].scan_index < 0) | |
1190 | continue; | |
1191 | for (j = i + 1; j < indio_dev->num_channels; j++) | |
1192 | if (channels[i].scan_index == channels[j].scan_index) { | |
1193 | dev_err(&indio_dev->dev, | |
1194 | "Duplicate scan index %d\n", | |
1195 | channels[i].scan_index); | |
1196 | return -EINVAL; | |
1197 | } | |
1198 | } | |
1199 | ||
1200 | return 0; | |
1201 | } | |
1202 | ||
0f1acee5 MH |
1203 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
1204 | ||
a7e57dce SK |
1205 | /** |
1206 | * iio_device_register() - register a device with the IIO subsystem | |
1207 | * @indio_dev: Device structure filled by the device driver | |
1208 | **/ | |
f8c6f4e9 | 1209 | int iio_device_register(struct iio_dev *indio_dev) |
847ec80b JC |
1210 | { |
1211 | int ret; | |
1212 | ||
17d82b47 GR |
1213 | /* If the calling driver did not initialize of_node, do it here */ |
1214 | if (!indio_dev->dev.of_node && indio_dev->dev.parent) | |
1215 | indio_dev->dev.of_node = indio_dev->dev.parent->of_node; | |
1216 | ||
8f5d8727 VD |
1217 | ret = iio_check_unique_scan_index(indio_dev); |
1218 | if (ret < 0) | |
1219 | return ret; | |
1220 | ||
1aa04278 | 1221 | /* configure elements for the chrdev */ |
f8c6f4e9 | 1222 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 1223 | |
e553f182 MH |
1224 | ret = iio_device_register_debugfs(indio_dev); |
1225 | if (ret) { | |
1226 | dev_err(indio_dev->dev.parent, | |
1227 | "Failed to register debugfs interfaces\n"); | |
92825ff9 | 1228 | return ret; |
e553f182 | 1229 | } |
3e1b6c95 LPC |
1230 | |
1231 | ret = iio_buffer_alloc_sysfs_and_mask(indio_dev); | |
1232 | if (ret) { | |
1233 | dev_err(indio_dev->dev.parent, | |
1234 | "Failed to create buffer sysfs interfaces\n"); | |
1235 | goto error_unreg_debugfs; | |
1236 | } | |
1237 | ||
f8c6f4e9 | 1238 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 1239 | if (ret) { |
f8c6f4e9 | 1240 | dev_err(indio_dev->dev.parent, |
847ec80b | 1241 | "Failed to register sysfs interfaces\n"); |
3e1b6c95 | 1242 | goto error_buffer_free_sysfs; |
847ec80b | 1243 | } |
f8c6f4e9 | 1244 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 1245 | if (ret) { |
f8c6f4e9 | 1246 | dev_err(indio_dev->dev.parent, |
c849d253 | 1247 | "Failed to register event set\n"); |
847ec80b JC |
1248 | goto error_free_sysfs; |
1249 | } | |
735ad074 | 1250 | if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED)) |
f8c6f4e9 | 1251 | iio_device_register_trigger_consumer(indio_dev); |
847ec80b | 1252 | |
0f1acee5 MH |
1253 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
1254 | indio_dev->setup_ops == NULL) | |
1255 | indio_dev->setup_ops = &noop_ring_setup_ops; | |
1256 | ||
f8c6f4e9 JC |
1257 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
1258 | indio_dev->chrdev.owner = indio_dev->info->driver_module; | |
0d5b7dae | 1259 | indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj; |
f8c6f4e9 | 1260 | ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); |
26d25ae3 | 1261 | if (ret < 0) |
0d5b7dae | 1262 | goto error_unreg_eventset; |
847ec80b | 1263 | |
0d5b7dae LPC |
1264 | ret = device_add(&indio_dev->dev); |
1265 | if (ret < 0) | |
1266 | goto error_cdev_del; | |
1267 | ||
1268 | return 0; | |
1269 | error_cdev_del: | |
1270 | cdev_del(&indio_dev->chrdev); | |
26d25ae3 | 1271 | error_unreg_eventset: |
f8c6f4e9 | 1272 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 1273 | error_free_sysfs: |
f8c6f4e9 | 1274 | iio_device_unregister_sysfs(indio_dev); |
3e1b6c95 LPC |
1275 | error_buffer_free_sysfs: |
1276 | iio_buffer_free_sysfs_and_mask(indio_dev); | |
e553f182 MH |
1277 | error_unreg_debugfs: |
1278 | iio_device_unregister_debugfs(indio_dev); | |
847ec80b JC |
1279 | return ret; |
1280 | } | |
1281 | EXPORT_SYMBOL(iio_device_register); | |
1282 | ||
a7e57dce SK |
1283 | /** |
1284 | * iio_device_unregister() - unregister a device from the IIO subsystem | |
1285 | * @indio_dev: Device structure representing the device. | |
1286 | **/ | |
f8c6f4e9 | 1287 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 1288 | { |
ac917a81 | 1289 | mutex_lock(&indio_dev->info_exist_lock); |
a87c82e4 LPC |
1290 | |
1291 | device_del(&indio_dev->dev); | |
1292 | ||
0d5b7dae LPC |
1293 | if (indio_dev->chrdev.dev) |
1294 | cdev_del(&indio_dev->chrdev); | |
bc4c9612 | 1295 | iio_device_unregister_debugfs(indio_dev); |
0d5b7dae | 1296 | |
a87c82e4 LPC |
1297 | iio_disable_all_buffers(indio_dev); |
1298 | ||
ac917a81 | 1299 | indio_dev->info = NULL; |
d2f0a48f LPC |
1300 | |
1301 | iio_device_wakeup_eventset(indio_dev); | |
1302 | iio_buffer_wakeup_poll(indio_dev); | |
1303 | ||
ac917a81 | 1304 | mutex_unlock(&indio_dev->info_exist_lock); |
3e1b6c95 LPC |
1305 | |
1306 | iio_buffer_free_sysfs_and_mask(indio_dev); | |
847ec80b JC |
1307 | } |
1308 | EXPORT_SYMBOL(iio_device_unregister); | |
8caa07c0 SK |
1309 | |
1310 | static void devm_iio_device_unreg(struct device *dev, void *res) | |
1311 | { | |
1312 | iio_device_unregister(*(struct iio_dev **)res); | |
1313 | } | |
1314 | ||
1315 | /** | |
1316 | * devm_iio_device_register - Resource-managed iio_device_register() | |
1317 | * @dev: Device to allocate iio_dev for | |
1318 | * @indio_dev: Device structure filled by the device driver | |
1319 | * | |
1320 | * Managed iio_device_register. The IIO device registered with this | |
1321 | * function is automatically unregistered on driver detach. This function | |
1322 | * calls iio_device_register() internally. Refer to that function for more | |
1323 | * information. | |
1324 | * | |
1325 | * If an iio_dev registered with this function needs to be unregistered | |
1326 | * separately, devm_iio_device_unregister() must be used. | |
1327 | * | |
1328 | * RETURNS: | |
1329 | * 0 on success, negative error number on failure. | |
1330 | */ | |
1331 | int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev) | |
1332 | { | |
1333 | struct iio_dev **ptr; | |
1334 | int ret; | |
1335 | ||
1336 | ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL); | |
1337 | if (!ptr) | |
1338 | return -ENOMEM; | |
1339 | ||
1340 | *ptr = indio_dev; | |
1341 | ret = iio_device_register(indio_dev); | |
1342 | if (!ret) | |
1343 | devres_add(dev, ptr); | |
1344 | else | |
1345 | devres_free(ptr); | |
1346 | ||
1347 | return ret; | |
1348 | } | |
1349 | EXPORT_SYMBOL_GPL(devm_iio_device_register); | |
1350 | ||
1351 | /** | |
1352 | * devm_iio_device_unregister - Resource-managed iio_device_unregister() | |
1353 | * @dev: Device this iio_dev belongs to | |
1354 | * @indio_dev: the iio_dev associated with the device | |
1355 | * | |
1356 | * Unregister iio_dev registered with devm_iio_device_register(). | |
1357 | */ | |
1358 | void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev) | |
1359 | { | |
1360 | int rc; | |
1361 | ||
1362 | rc = devres_release(dev, devm_iio_device_unreg, | |
1363 | devm_iio_device_match, indio_dev); | |
1364 | WARN_ON(rc); | |
1365 | } | |
1366 | EXPORT_SYMBOL_GPL(devm_iio_device_unregister); | |
1367 | ||
847ec80b JC |
1368 | subsys_initcall(iio_init); |
1369 | module_exit(iio_exit); | |
1370 | ||
c8b95952 | 1371 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
847ec80b JC |
1372 | MODULE_DESCRIPTION("Industrial I/O core"); |
1373 | MODULE_LICENSE("GPL"); |