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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 | ||
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> |
08a33805 | 28 | #include <linux/mutex.h> |
06458e27 | 29 | #include <linux/iio/iio.h> |
df9c1c42 | 30 | #include "iio_core.h" |
6aea1c36 | 31 | #include "iio_core_trigger.h" |
06458e27 JC |
32 | #include <linux/iio/sysfs.h> |
33 | #include <linux/iio/events.h> | |
9e69c935 | 34 | #include <linux/iio/buffer.h> |
9dd1cb30 | 35 | |
99698b45 | 36 | /* IDA to assign each registered device a unique id */ |
b156cf70 | 37 | static DEFINE_IDA(iio_ida); |
847ec80b | 38 | |
f625cb97 | 39 | static dev_t iio_devt; |
847ec80b JC |
40 | |
41 | #define IIO_DEV_MAX 256 | |
5aaaeba8 | 42 | struct bus_type iio_bus_type = { |
847ec80b | 43 | .name = "iio", |
847ec80b | 44 | }; |
5aaaeba8 | 45 | EXPORT_SYMBOL(iio_bus_type); |
847ec80b | 46 | |
e553f182 MH |
47 | static struct dentry *iio_debugfs_dentry; |
48 | ||
c6fc8062 JC |
49 | static const char * const iio_direction[] = { |
50 | [0] = "in", | |
51 | [1] = "out", | |
52 | }; | |
53 | ||
ade7ef7b | 54 | static const char * const iio_chan_type_name_spec[] = { |
c6fc8062 | 55 | [IIO_VOLTAGE] = "voltage", |
faf290e8 MH |
56 | [IIO_CURRENT] = "current", |
57 | [IIO_POWER] = "power", | |
9bff02f8 | 58 | [IIO_ACCEL] = "accel", |
41ea040c | 59 | [IIO_ANGL_VEL] = "anglvel", |
1d892719 | 60 | [IIO_MAGN] = "magn", |
9bff02f8 BF |
61 | [IIO_LIGHT] = "illuminance", |
62 | [IIO_INTENSITY] = "intensity", | |
f09f2c81 | 63 | [IIO_PROXIMITY] = "proximity", |
9bff02f8 | 64 | [IIO_TEMP] = "temp", |
1d892719 JC |
65 | [IIO_INCLI] = "incli", |
66 | [IIO_ROT] = "rot", | |
1d892719 | 67 | [IIO_ANGL] = "angl", |
9bff02f8 | 68 | [IIO_TIMESTAMP] = "timestamp", |
66dbe704 | 69 | [IIO_CAPACITANCE] = "capacitance", |
a6b12855 | 70 | [IIO_ALTVOLTAGE] = "altvoltage", |
21cd1fab | 71 | [IIO_CCT] = "cct", |
c4f0c693 | 72 | [IIO_PRESSURE] = "pressure", |
ac216aa2 | 73 | [IIO_HUMIDITYRELATIVE] = "humidityrelative", |
55aebeb9 | 74 | [IIO_ACTIVITY] = "activity", |
a88bfe78 | 75 | [IIO_STEPS] = "steps", |
72c66644 | 76 | [IIO_ENERGY] = "energy", |
cc3c9eec | 77 | [IIO_DISTANCE] = "distance", |
5a1a9329 | 78 | [IIO_VELOCITY] = "velocity", |
8ff6b3bc | 79 | [IIO_CONCENTRATION] = "concentration", |
d38d5469 | 80 | [IIO_RESISTANCE] = "resistance", |
ecb3a7cc | 81 | [IIO_PH] = "ph", |
d409404c | 82 | [IIO_UVINDEX] = "uvindex", |
4b9d2090 | 83 | [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity", |
1d892719 JC |
84 | }; |
85 | ||
330c6c57 | 86 | static const char * const iio_modifier_names[] = { |
1d892719 JC |
87 | [IIO_MOD_X] = "x", |
88 | [IIO_MOD_Y] = "y", | |
89 | [IIO_MOD_Z] = "z", | |
4b8d8015 PM |
90 | [IIO_MOD_X_AND_Y] = "x&y", |
91 | [IIO_MOD_X_AND_Z] = "x&z", | |
92 | [IIO_MOD_Y_AND_Z] = "y&z", | |
93 | [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z", | |
94 | [IIO_MOD_X_OR_Y] = "x|y", | |
95 | [IIO_MOD_X_OR_Z] = "x|z", | |
96 | [IIO_MOD_Y_OR_Z] = "y|z", | |
97 | [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z", | |
8f5879b2 | 98 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", |
cf82cb81 | 99 | [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", |
330c6c57 JC |
100 | [IIO_MOD_LIGHT_BOTH] = "both", |
101 | [IIO_MOD_LIGHT_IR] = "ir", | |
21cd1fab JB |
102 | [IIO_MOD_LIGHT_CLEAR] = "clear", |
103 | [IIO_MOD_LIGHT_RED] = "red", | |
104 | [IIO_MOD_LIGHT_GREEN] = "green", | |
105 | [IIO_MOD_LIGHT_BLUE] = "blue", | |
2c5ff1f9 | 106 | [IIO_MOD_LIGHT_UV] = "uv", |
5082f405 | 107 | [IIO_MOD_QUATERNION] = "quaternion", |
638b43b3 PM |
108 | [IIO_MOD_TEMP_AMBIENT] = "ambient", |
109 | [IIO_MOD_TEMP_OBJECT] = "object", | |
11b8ddab RA |
110 | [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", |
111 | [IIO_MOD_NORTH_TRUE] = "from_north_true", | |
112 | [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", | |
113 | [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", | |
55aebeb9 DB |
114 | [IIO_MOD_RUNNING] = "running", |
115 | [IIO_MOD_JOGGING] = "jogging", | |
116 | [IIO_MOD_WALKING] = "walking", | |
117 | [IIO_MOD_STILL] = "still", | |
5a1a9329 | 118 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", |
1ce87f21 LPC |
119 | [IIO_MOD_I] = "i", |
120 | [IIO_MOD_Q] = "q", | |
8ff6b3bc MR |
121 | [IIO_MOD_CO2] = "co2", |
122 | [IIO_MOD_VOC] = "voc", | |
1d892719 JC |
123 | }; |
124 | ||
125 | /* relies on pairs of these shared then separate */ | |
126 | static const char * const iio_chan_info_postfix[] = { | |
75a973c7 JC |
127 | [IIO_CHAN_INFO_RAW] = "raw", |
128 | [IIO_CHAN_INFO_PROCESSED] = "input", | |
c8a9f805 JC |
129 | [IIO_CHAN_INFO_SCALE] = "scale", |
130 | [IIO_CHAN_INFO_OFFSET] = "offset", | |
131 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", | |
132 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", | |
133 | [IIO_CHAN_INFO_PEAK] = "peak_raw", | |
134 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", | |
135 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", | |
136 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", | |
df94aba8 JC |
137 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
138 | = "filter_low_pass_3db_frequency", | |
3f7f642b MF |
139 | [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY] |
140 | = "filter_high_pass_3db_frequency", | |
ce85a1cb | 141 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", |
a6b12855 MH |
142 | [IIO_CHAN_INFO_FREQUENCY] = "frequency", |
143 | [IIO_CHAN_INFO_PHASE] = "phase", | |
b65d6212 | 144 | [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", |
7c9ab035 | 145 | [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", |
899d90bd | 146 | [IIO_CHAN_INFO_INT_TIME] = "integration_time", |
a88bfe78 | 147 | [IIO_CHAN_INFO_ENABLE] = "en", |
bcdf28fb | 148 | [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight", |
d37f6836 | 149 | [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight", |
2f0ecb7c IT |
150 | [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count", |
151 | [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time", | |
c8a85854 | 152 | [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity", |
faaa4495 | 153 | [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio", |
1d892719 JC |
154 | }; |
155 | ||
a7e57dce SK |
156 | /** |
157 | * iio_find_channel_from_si() - get channel from its scan index | |
158 | * @indio_dev: device | |
159 | * @si: scan index to match | |
160 | */ | |
5fb21c82 JC |
161 | const struct iio_chan_spec |
162 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) | |
163 | { | |
164 | int i; | |
165 | ||
166 | for (i = 0; i < indio_dev->num_channels; i++) | |
167 | if (indio_dev->channels[i].scan_index == si) | |
168 | return &indio_dev->channels[i]; | |
169 | return NULL; | |
170 | } | |
171 | ||
847ec80b JC |
172 | /* This turns up an awful lot */ |
173 | ssize_t iio_read_const_attr(struct device *dev, | |
174 | struct device_attribute *attr, | |
175 | char *buf) | |
176 | { | |
177 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
178 | } | |
179 | EXPORT_SYMBOL(iio_read_const_attr); | |
180 | ||
847ec80b JC |
181 | static int __init iio_init(void) |
182 | { | |
183 | int ret; | |
184 | ||
5aaaeba8 JC |
185 | /* Register sysfs bus */ |
186 | ret = bus_register(&iio_bus_type); | |
847ec80b | 187 | if (ret < 0) { |
3176dd5d | 188 | pr_err("could not register bus type\n"); |
847ec80b JC |
189 | goto error_nothing; |
190 | } | |
191 | ||
9aa1a167 JC |
192 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
193 | if (ret < 0) { | |
3176dd5d | 194 | pr_err("failed to allocate char dev region\n"); |
5aaaeba8 | 195 | goto error_unregister_bus_type; |
9aa1a167 | 196 | } |
847ec80b | 197 | |
e553f182 MH |
198 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
199 | ||
847ec80b JC |
200 | return 0; |
201 | ||
5aaaeba8 JC |
202 | error_unregister_bus_type: |
203 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
204 | error_nothing: |
205 | return ret; | |
206 | } | |
207 | ||
208 | static void __exit iio_exit(void) | |
209 | { | |
9aa1a167 JC |
210 | if (iio_devt) |
211 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 212 | bus_unregister(&iio_bus_type); |
e553f182 MH |
213 | debugfs_remove(iio_debugfs_dentry); |
214 | } | |
215 | ||
216 | #if defined(CONFIG_DEBUG_FS) | |
e553f182 MH |
217 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
218 | size_t count, loff_t *ppos) | |
219 | { | |
220 | struct iio_dev *indio_dev = file->private_data; | |
221 | char buf[20]; | |
222 | unsigned val = 0; | |
223 | ssize_t len; | |
224 | int ret; | |
225 | ||
226 | ret = indio_dev->info->debugfs_reg_access(indio_dev, | |
227 | indio_dev->cached_reg_addr, | |
228 | 0, &val); | |
229 | if (ret) | |
230 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); | |
231 | ||
232 | len = snprintf(buf, sizeof(buf), "0x%X\n", val); | |
233 | ||
234 | return simple_read_from_buffer(userbuf, count, ppos, buf, len); | |
235 | } | |
236 | ||
237 | static ssize_t iio_debugfs_write_reg(struct file *file, | |
238 | const char __user *userbuf, size_t count, loff_t *ppos) | |
239 | { | |
240 | struct iio_dev *indio_dev = file->private_data; | |
241 | unsigned reg, val; | |
242 | char buf[80]; | |
243 | int ret; | |
244 | ||
245 | count = min_t(size_t, count, (sizeof(buf)-1)); | |
246 | if (copy_from_user(buf, userbuf, count)) | |
247 | return -EFAULT; | |
248 | ||
249 | buf[count] = 0; | |
250 | ||
251 | ret = sscanf(buf, "%i %i", ®, &val); | |
252 | ||
253 | switch (ret) { | |
254 | case 1: | |
255 | indio_dev->cached_reg_addr = reg; | |
256 | break; | |
257 | case 2: | |
258 | indio_dev->cached_reg_addr = reg; | |
259 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, | |
260 | val, NULL); | |
261 | if (ret) { | |
262 | dev_err(indio_dev->dev.parent, "%s: write failed\n", | |
263 | __func__); | |
264 | return ret; | |
265 | } | |
266 | break; | |
267 | default: | |
268 | return -EINVAL; | |
269 | } | |
270 | ||
271 | return count; | |
272 | } | |
273 | ||
274 | static const struct file_operations iio_debugfs_reg_fops = { | |
5a28c873 | 275 | .open = simple_open, |
e553f182 MH |
276 | .read = iio_debugfs_read_reg, |
277 | .write = iio_debugfs_write_reg, | |
278 | }; | |
279 | ||
280 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
281 | { | |
282 | debugfs_remove_recursive(indio_dev->debugfs_dentry); | |
847ec80b JC |
283 | } |
284 | ||
e553f182 MH |
285 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
286 | { | |
287 | struct dentry *d; | |
288 | ||
289 | if (indio_dev->info->debugfs_reg_access == NULL) | |
290 | return 0; | |
291 | ||
abd5a2fb | 292 | if (!iio_debugfs_dentry) |
e553f182 MH |
293 | return 0; |
294 | ||
295 | indio_dev->debugfs_dentry = | |
296 | debugfs_create_dir(dev_name(&indio_dev->dev), | |
297 | iio_debugfs_dentry); | |
e553f182 MH |
298 | if (indio_dev->debugfs_dentry == NULL) { |
299 | dev_warn(indio_dev->dev.parent, | |
300 | "Failed to create debugfs directory\n"); | |
301 | return -EFAULT; | |
302 | } | |
303 | ||
304 | d = debugfs_create_file("direct_reg_access", 0644, | |
305 | indio_dev->debugfs_dentry, | |
306 | indio_dev, &iio_debugfs_reg_fops); | |
307 | if (!d) { | |
308 | iio_device_unregister_debugfs(indio_dev); | |
309 | return -ENOMEM; | |
310 | } | |
311 | ||
312 | return 0; | |
313 | } | |
314 | #else | |
315 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) | |
316 | { | |
317 | return 0; | |
318 | } | |
319 | ||
320 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
321 | { | |
322 | } | |
323 | #endif /* CONFIG_DEBUG_FS */ | |
324 | ||
4fee7e16 LPC |
325 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
326 | struct device_attribute *attr, | |
327 | char *buf) | |
328 | { | |
e53f5ac5 | 329 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
330 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
331 | const struct iio_chan_spec_ext_info *ext_info; | |
332 | ||
333 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
334 | ||
fc6d1139 | 335 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
4fee7e16 LPC |
336 | } |
337 | ||
338 | static ssize_t iio_write_channel_ext_info(struct device *dev, | |
339 | struct device_attribute *attr, | |
340 | const char *buf, | |
341 | size_t len) | |
342 | { | |
e53f5ac5 | 343 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
344 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
345 | const struct iio_chan_spec_ext_info *ext_info; | |
346 | ||
347 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
348 | ||
fc6d1139 MH |
349 | return ext_info->write(indio_dev, ext_info->private, |
350 | this_attr->c, buf, len); | |
4fee7e16 LPC |
351 | } |
352 | ||
5212cc8a LPC |
353 | ssize_t iio_enum_available_read(struct iio_dev *indio_dev, |
354 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
355 | { | |
356 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
357 | unsigned int i; | |
358 | size_t len = 0; | |
359 | ||
360 | if (!e->num_items) | |
361 | return 0; | |
362 | ||
363 | for (i = 0; i < e->num_items; ++i) | |
74dcd439 | 364 | len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); |
5212cc8a LPC |
365 | |
366 | /* replace last space with a newline */ | |
367 | buf[len - 1] = '\n'; | |
368 | ||
369 | return len; | |
370 | } | |
371 | EXPORT_SYMBOL_GPL(iio_enum_available_read); | |
372 | ||
373 | ssize_t iio_enum_read(struct iio_dev *indio_dev, | |
374 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
375 | { | |
376 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
377 | int i; | |
378 | ||
379 | if (!e->get) | |
380 | return -EINVAL; | |
381 | ||
382 | i = e->get(indio_dev, chan); | |
383 | if (i < 0) | |
384 | return i; | |
385 | else if (i >= e->num_items) | |
386 | return -EINVAL; | |
387 | ||
598db581 | 388 | return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]); |
5212cc8a LPC |
389 | } |
390 | EXPORT_SYMBOL_GPL(iio_enum_read); | |
391 | ||
392 | ssize_t iio_enum_write(struct iio_dev *indio_dev, | |
393 | uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, | |
394 | size_t len) | |
395 | { | |
396 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
397 | unsigned int i; | |
398 | int ret; | |
399 | ||
400 | if (!e->set) | |
401 | return -EINVAL; | |
402 | ||
403 | for (i = 0; i < e->num_items; i++) { | |
404 | if (sysfs_streq(buf, e->items[i])) | |
405 | break; | |
406 | } | |
407 | ||
408 | if (i == e->num_items) | |
409 | return -EINVAL; | |
410 | ||
411 | ret = e->set(indio_dev, chan, i); | |
412 | return ret ? ret : len; | |
413 | } | |
414 | EXPORT_SYMBOL_GPL(iio_enum_write); | |
415 | ||
dfc57732 GB |
416 | static const struct iio_mount_matrix iio_mount_idmatrix = { |
417 | .rotation = { | |
418 | "1", "0", "0", | |
419 | "0", "1", "0", | |
420 | "0", "0", "1" | |
421 | } | |
422 | }; | |
423 | ||
424 | static int iio_setup_mount_idmatrix(const struct device *dev, | |
425 | struct iio_mount_matrix *matrix) | |
426 | { | |
427 | *matrix = iio_mount_idmatrix; | |
428 | dev_info(dev, "mounting matrix not found: using identity...\n"); | |
429 | return 0; | |
430 | } | |
431 | ||
432 | ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv, | |
433 | const struct iio_chan_spec *chan, char *buf) | |
434 | { | |
435 | const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *) | |
436 | priv)(indio_dev, chan); | |
437 | ||
438 | if (IS_ERR(mtx)) | |
439 | return PTR_ERR(mtx); | |
440 | ||
441 | if (!mtx) | |
442 | mtx = &iio_mount_idmatrix; | |
443 | ||
444 | return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n", | |
445 | mtx->rotation[0], mtx->rotation[1], mtx->rotation[2], | |
446 | mtx->rotation[3], mtx->rotation[4], mtx->rotation[5], | |
447 | mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]); | |
448 | } | |
449 | EXPORT_SYMBOL_GPL(iio_show_mount_matrix); | |
450 | ||
451 | /** | |
452 | * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from | |
453 | * device-tree "mount-matrix" property | |
454 | * @dev: device the mounting matrix property is assigned to | |
455 | * @propname: device specific mounting matrix property name | |
456 | * @matrix: where to store retrieved matrix | |
457 | * | |
458 | * If device is assigned no mounting matrix property, a default 3x3 identity | |
459 | * matrix will be filled in. | |
460 | * | |
461 | * Return: 0 if success, or a negative error code on failure. | |
462 | */ | |
463 | #ifdef CONFIG_OF | |
464 | int of_iio_read_mount_matrix(const struct device *dev, | |
465 | const char *propname, | |
466 | struct iio_mount_matrix *matrix) | |
467 | { | |
468 | if (dev->of_node) { | |
469 | int err = of_property_read_string_array(dev->of_node, | |
470 | propname, matrix->rotation, | |
471 | ARRAY_SIZE(iio_mount_idmatrix.rotation)); | |
472 | ||
473 | if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation)) | |
474 | return 0; | |
475 | ||
476 | if (err >= 0) | |
477 | /* Invalid number of matrix entries. */ | |
478 | return -EINVAL; | |
479 | ||
480 | if (err != -EINVAL) | |
481 | /* Invalid matrix declaration format. */ | |
482 | return err; | |
483 | } | |
484 | ||
485 | /* Matrix was not declared at all: fallback to identity. */ | |
486 | return iio_setup_mount_idmatrix(dev, matrix); | |
487 | } | |
488 | #else | |
489 | int of_iio_read_mount_matrix(const struct device *dev, | |
490 | const char *propname, | |
491 | struct iio_mount_matrix *matrix) | |
492 | { | |
493 | return iio_setup_mount_idmatrix(dev, matrix); | |
494 | } | |
495 | #endif | |
496 | EXPORT_SYMBOL(of_iio_read_mount_matrix); | |
497 | ||
3661f3f5 LPC |
498 | /** |
499 | * iio_format_value() - Formats a IIO value into its string representation | |
2498dcf6 CO |
500 | * @buf: The buffer to which the formatted value gets written |
501 | * @type: One of the IIO_VAL_... constants. This decides how the val | |
502 | * and val2 parameters are formatted. | |
503 | * @size: Number of IIO value entries contained in vals | |
504 | * @vals: Pointer to the values, exact meaning depends on the | |
505 | * type parameter. | |
506 | * | |
507 | * Return: 0 by default, a negative number on failure or the | |
508 | * total number of characters written for a type that belongs | |
509 | * to the IIO_VAL_... constant. | |
3661f3f5 | 510 | */ |
9fbfb4b3 | 511 | ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) |
847ec80b | 512 | { |
7985e7c1 | 513 | unsigned long long tmp; |
67eedba3 | 514 | bool scale_db = false; |
1d892719 | 515 | |
3661f3f5 | 516 | switch (type) { |
67eedba3 | 517 | case IIO_VAL_INT: |
9fbfb4b3 | 518 | return sprintf(buf, "%d\n", vals[0]); |
67eedba3 MH |
519 | case IIO_VAL_INT_PLUS_MICRO_DB: |
520 | scale_db = true; | |
521 | case IIO_VAL_INT_PLUS_MICRO: | |
9fbfb4b3 | 522 | if (vals[1] < 0) |
8f57e4d9 MN |
523 | return sprintf(buf, "-%d.%06u%s\n", abs(vals[0]), |
524 | -vals[1], scale_db ? " dB" : ""); | |
1d892719 | 525 | else |
9fbfb4b3 | 526 | return sprintf(buf, "%d.%06u%s\n", vals[0], vals[1], |
67eedba3 MH |
527 | scale_db ? " dB" : ""); |
528 | case IIO_VAL_INT_PLUS_NANO: | |
9fbfb4b3 | 529 | if (vals[1] < 0) |
8f57e4d9 MN |
530 | return sprintf(buf, "-%d.%09u\n", abs(vals[0]), |
531 | -vals[1]); | |
71646e2c | 532 | else |
9fbfb4b3 | 533 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); |
7985e7c1 | 534 | case IIO_VAL_FRACTIONAL: |
9fbfb4b3 SP |
535 | tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]); |
536 | vals[1] = do_div(tmp, 1000000000LL); | |
537 | vals[0] = tmp; | |
538 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); | |
103d9fb9 | 539 | case IIO_VAL_FRACTIONAL_LOG2: |
9fbfb4b3 SP |
540 | tmp = (s64)vals[0] * 1000000000LL >> vals[1]; |
541 | vals[1] = do_div(tmp, 1000000000LL); | |
542 | vals[0] = tmp; | |
543 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); | |
544 | case IIO_VAL_INT_MULTIPLE: | |
545 | { | |
546 | int i; | |
547 | int len = 0; | |
548 | ||
549 | for (i = 0; i < size; ++i) | |
550 | len += snprintf(&buf[len], PAGE_SIZE - len, "%d ", | |
551 | vals[i]); | |
552 | len += snprintf(&buf[len], PAGE_SIZE - len, "\n"); | |
553 | return len; | |
554 | } | |
67eedba3 | 555 | default: |
1d892719 | 556 | return 0; |
67eedba3 | 557 | } |
1d892719 | 558 | } |
7d2c2aca | 559 | EXPORT_SYMBOL_GPL(iio_format_value); |
1d892719 | 560 | |
3661f3f5 LPC |
561 | static ssize_t iio_read_channel_info(struct device *dev, |
562 | struct device_attribute *attr, | |
563 | char *buf) | |
564 | { | |
565 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
566 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
9fbfb4b3 SP |
567 | int vals[INDIO_MAX_RAW_ELEMENTS]; |
568 | int ret; | |
569 | int val_len = 2; | |
570 | ||
571 | if (indio_dev->info->read_raw_multi) | |
572 | ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c, | |
573 | INDIO_MAX_RAW_ELEMENTS, | |
574 | vals, &val_len, | |
575 | this_attr->address); | |
576 | else | |
577 | ret = indio_dev->info->read_raw(indio_dev, this_attr->c, | |
578 | &vals[0], &vals[1], this_attr->address); | |
3661f3f5 LPC |
579 | |
580 | if (ret < 0) | |
581 | return ret; | |
582 | ||
9fbfb4b3 | 583 | return iio_format_value(buf, ret, val_len, vals); |
3661f3f5 LPC |
584 | } |
585 | ||
6807d721 LPC |
586 | /** |
587 | * iio_str_to_fixpoint() - Parse a fixed-point number from a string | |
588 | * @str: The string to parse | |
589 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 | |
590 | * @integer: The integer part of the number | |
591 | * @fract: The fractional part of the number | |
592 | * | |
593 | * Returns 0 on success, or a negative error code if the string could not be | |
594 | * parsed. | |
595 | */ | |
596 | int iio_str_to_fixpoint(const char *str, int fract_mult, | |
597 | int *integer, int *fract) | |
598 | { | |
599 | int i = 0, f = 0; | |
600 | bool integer_part = true, negative = false; | |
601 | ||
f47dff32 SN |
602 | if (fract_mult == 0) { |
603 | *fract = 0; | |
604 | ||
605 | return kstrtoint(str, 0, integer); | |
606 | } | |
607 | ||
6807d721 LPC |
608 | if (str[0] == '-') { |
609 | negative = true; | |
610 | str++; | |
611 | } else if (str[0] == '+') { | |
612 | str++; | |
613 | } | |
614 | ||
615 | while (*str) { | |
616 | if ('0' <= *str && *str <= '9') { | |
617 | if (integer_part) { | |
618 | i = i * 10 + *str - '0'; | |
619 | } else { | |
620 | f += fract_mult * (*str - '0'); | |
621 | fract_mult /= 10; | |
622 | } | |
623 | } else if (*str == '\n') { | |
624 | if (*(str + 1) == '\0') | |
625 | break; | |
626 | else | |
627 | return -EINVAL; | |
628 | } else if (*str == '.' && integer_part) { | |
629 | integer_part = false; | |
630 | } else { | |
631 | return -EINVAL; | |
632 | } | |
633 | str++; | |
634 | } | |
635 | ||
636 | if (negative) { | |
637 | if (i) | |
638 | i = -i; | |
639 | else | |
640 | f = -f; | |
641 | } | |
642 | ||
643 | *integer = i; | |
644 | *fract = f; | |
645 | ||
646 | return 0; | |
647 | } | |
648 | EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); | |
649 | ||
1d892719 JC |
650 | static ssize_t iio_write_channel_info(struct device *dev, |
651 | struct device_attribute *attr, | |
652 | const char *buf, | |
653 | size_t len) | |
654 | { | |
e53f5ac5 | 655 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719 | 656 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
6807d721 LPC |
657 | int ret, fract_mult = 100000; |
658 | int integer, fract; | |
1d892719 JC |
659 | |
660 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 661 | if (!indio_dev->info->write_raw) |
1d892719 | 662 | return -EINVAL; |
5c04af04 MH |
663 | |
664 | if (indio_dev->info->write_raw_get_fmt) | |
665 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, | |
666 | this_attr->c, this_attr->address)) { | |
f47dff32 SN |
667 | case IIO_VAL_INT: |
668 | fract_mult = 0; | |
669 | break; | |
5c04af04 MH |
670 | case IIO_VAL_INT_PLUS_MICRO: |
671 | fract_mult = 100000; | |
672 | break; | |
673 | case IIO_VAL_INT_PLUS_NANO: | |
674 | fract_mult = 100000000; | |
675 | break; | |
676 | default: | |
677 | return -EINVAL; | |
678 | } | |
679 | ||
6807d721 LPC |
680 | ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract); |
681 | if (ret) | |
682 | return ret; | |
1d892719 | 683 | |
6fe8135f | 684 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 685 | integer, fract, this_attr->address); |
1d892719 JC |
686 | if (ret) |
687 | return ret; | |
688 | ||
689 | return len; | |
690 | } | |
691 | ||
df9c1c42 | 692 | static |
1d892719 JC |
693 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
694 | const char *postfix, | |
695 | struct iio_chan_spec const *chan, | |
696 | ssize_t (*readfunc)(struct device *dev, | |
697 | struct device_attribute *attr, | |
698 | char *buf), | |
699 | ssize_t (*writefunc)(struct device *dev, | |
700 | struct device_attribute *attr, | |
701 | const char *buf, | |
702 | size_t len), | |
3704432f | 703 | enum iio_shared_by shared_by) |
1d892719 | 704 | { |
3704432f | 705 | int ret = 0; |
7bbcf7e1 | 706 | char *name = NULL; |
3704432f | 707 | char *full_postfix; |
1d892719 | 708 | sysfs_attr_init(&dev_attr->attr); |
1d892719 | 709 | |
ade7ef7b | 710 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
3704432f | 711 | if (chan->modified && (shared_by == IIO_SEPARATE)) { |
ade7ef7b JC |
712 | if (chan->extend_name) |
713 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
714 | iio_modifier_names[chan | |
715 | ->channel2], | |
716 | chan->extend_name, | |
717 | postfix); | |
718 | else | |
719 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
720 | iio_modifier_names[chan | |
721 | ->channel2], | |
722 | postfix); | |
723 | } else { | |
77bfa8ba | 724 | if (chan->extend_name == NULL || shared_by != IIO_SEPARATE) |
ade7ef7b JC |
725 | full_postfix = kstrdup(postfix, GFP_KERNEL); |
726 | else | |
727 | full_postfix = kasprintf(GFP_KERNEL, | |
728 | "%s_%s", | |
729 | chan->extend_name, | |
730 | postfix); | |
731 | } | |
3704432f JC |
732 | if (full_postfix == NULL) |
733 | return -ENOMEM; | |
1d892719 | 734 | |
4abf6f8b | 735 | if (chan->differential) { /* Differential can not have modifier */ |
3704432f | 736 | switch (shared_by) { |
c006ec83 | 737 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 738 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
739 | break; |
740 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 741 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
742 | iio_direction[chan->output], |
743 | full_postfix); | |
744 | break; | |
3704432f | 745 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 746 | name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", |
ade7ef7b JC |
747 | iio_direction[chan->output], |
748 | iio_chan_type_name_spec[chan->type], | |
749 | iio_chan_type_name_spec[chan->type], | |
750 | full_postfix); | |
3704432f JC |
751 | break; |
752 | case IIO_SEPARATE: | |
753 | if (!chan->indexed) { | |
231bfe53 | 754 | WARN(1, "Differential channels must be indexed\n"); |
3704432f JC |
755 | ret = -EINVAL; |
756 | goto error_free_full_postfix; | |
757 | } | |
7bbcf7e1 | 758 | name = kasprintf(GFP_KERNEL, |
3704432f | 759 | "%s_%s%d-%s%d_%s", |
ade7ef7b JC |
760 | iio_direction[chan->output], |
761 | iio_chan_type_name_spec[chan->type], | |
762 | chan->channel, | |
763 | iio_chan_type_name_spec[chan->type], | |
764 | chan->channel2, | |
765 | full_postfix); | |
3704432f | 766 | break; |
ade7ef7b JC |
767 | } |
768 | } else { /* Single ended */ | |
3704432f | 769 | switch (shared_by) { |
c006ec83 | 770 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 771 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
772 | break; |
773 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 774 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
775 | iio_direction[chan->output], |
776 | full_postfix); | |
777 | break; | |
3704432f | 778 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 779 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
ade7ef7b JC |
780 | iio_direction[chan->output], |
781 | iio_chan_type_name_spec[chan->type], | |
782 | full_postfix); | |
3704432f JC |
783 | break; |
784 | ||
785 | case IIO_SEPARATE: | |
786 | if (chan->indexed) | |
7bbcf7e1 | 787 | name = kasprintf(GFP_KERNEL, "%s_%s%d_%s", |
3704432f JC |
788 | iio_direction[chan->output], |
789 | iio_chan_type_name_spec[chan->type], | |
790 | chan->channel, | |
791 | full_postfix); | |
792 | else | |
7bbcf7e1 | 793 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
3704432f JC |
794 | iio_direction[chan->output], |
795 | iio_chan_type_name_spec[chan->type], | |
796 | full_postfix); | |
797 | break; | |
798 | } | |
ade7ef7b | 799 | } |
7bbcf7e1 | 800 | if (name == NULL) { |
1d892719 JC |
801 | ret = -ENOMEM; |
802 | goto error_free_full_postfix; | |
803 | } | |
7bbcf7e1 | 804 | dev_attr->attr.name = name; |
1d892719 JC |
805 | |
806 | if (readfunc) { | |
807 | dev_attr->attr.mode |= S_IRUGO; | |
808 | dev_attr->show = readfunc; | |
809 | } | |
810 | ||
811 | if (writefunc) { | |
812 | dev_attr->attr.mode |= S_IWUSR; | |
813 | dev_attr->store = writefunc; | |
814 | } | |
7bbcf7e1 | 815 | |
1d892719 JC |
816 | error_free_full_postfix: |
817 | kfree(full_postfix); | |
3704432f | 818 | |
1d892719 JC |
819 | return ret; |
820 | } | |
821 | ||
df9c1c42 | 822 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
823 | { |
824 | kfree(dev_attr->attr.name); | |
825 | } | |
826 | ||
827 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
828 | struct iio_chan_spec const *chan, |
829 | ssize_t (*readfunc)(struct device *dev, | |
830 | struct device_attribute *attr, | |
831 | char *buf), | |
832 | ssize_t (*writefunc)(struct device *dev, | |
833 | struct device_attribute *attr, | |
834 | const char *buf, | |
835 | size_t len), | |
e614a54b | 836 | u64 mask, |
3704432f | 837 | enum iio_shared_by shared_by, |
1d892719 JC |
838 | struct device *dev, |
839 | struct list_head *attr_list) | |
840 | { | |
841 | int ret; | |
842 | struct iio_dev_attr *iio_attr, *t; | |
843 | ||
670c1103 | 844 | iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL); |
92825ff9 HK |
845 | if (iio_attr == NULL) |
846 | return -ENOMEM; | |
1d892719 JC |
847 | ret = __iio_device_attr_init(&iio_attr->dev_attr, |
848 | postfix, chan, | |
3704432f | 849 | readfunc, writefunc, shared_by); |
1d892719 JC |
850 | if (ret) |
851 | goto error_iio_dev_attr_free; | |
852 | iio_attr->c = chan; | |
853 | iio_attr->address = mask; | |
854 | list_for_each_entry(t, attr_list, l) | |
855 | if (strcmp(t->dev_attr.attr.name, | |
856 | iio_attr->dev_attr.attr.name) == 0) { | |
3704432f | 857 | if (shared_by == IIO_SEPARATE) |
1d892719 JC |
858 | dev_err(dev, "tried to double register : %s\n", |
859 | t->dev_attr.attr.name); | |
860 | ret = -EBUSY; | |
861 | goto error_device_attr_deinit; | |
862 | } | |
1d892719 JC |
863 | list_add(&iio_attr->l, attr_list); |
864 | ||
865 | return 0; | |
866 | ||
867 | error_device_attr_deinit: | |
868 | __iio_device_attr_deinit(&iio_attr->dev_attr); | |
869 | error_iio_dev_attr_free: | |
870 | kfree(iio_attr); | |
1d892719 JC |
871 | return ret; |
872 | } | |
873 | ||
3704432f JC |
874 | static int iio_device_add_info_mask_type(struct iio_dev *indio_dev, |
875 | struct iio_chan_spec const *chan, | |
876 | enum iio_shared_by shared_by, | |
877 | const long *infomask) | |
1d892719 | 878 | { |
3704432f | 879 | int i, ret, attrcount = 0; |
1d892719 | 880 | |
3704432f | 881 | for_each_set_bit(i, infomask, sizeof(infomask)*8) { |
ef4b4856 JC |
882 | if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
883 | return -EINVAL; | |
8655cc49 JC |
884 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i], |
885 | chan, | |
886 | &iio_read_channel_info, | |
887 | &iio_write_channel_info, | |
888 | i, | |
3704432f | 889 | shared_by, |
8655cc49 JC |
890 | &indio_dev->dev, |
891 | &indio_dev->channel_attr_list); | |
3704432f | 892 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
8655cc49 | 893 | continue; |
3704432f JC |
894 | else if (ret < 0) |
895 | return ret; | |
8655cc49 JC |
896 | attrcount++; |
897 | } | |
5f420b42 | 898 | |
3704432f JC |
899 | return attrcount; |
900 | } | |
901 | ||
902 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, | |
903 | struct iio_chan_spec const *chan) | |
904 | { | |
905 | int ret, attrcount = 0; | |
906 | const struct iio_chan_spec_ext_info *ext_info; | |
907 | ||
908 | if (chan->channel < 0) | |
909 | return 0; | |
910 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
911 | IIO_SEPARATE, | |
912 | &chan->info_mask_separate); | |
913 | if (ret < 0) | |
914 | return ret; | |
915 | attrcount += ret; | |
916 | ||
917 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
918 | IIO_SHARED_BY_TYPE, | |
919 | &chan->info_mask_shared_by_type); | |
920 | if (ret < 0) | |
921 | return ret; | |
922 | attrcount += ret; | |
923 | ||
c006ec83 JC |
924 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
925 | IIO_SHARED_BY_DIR, | |
926 | &chan->info_mask_shared_by_dir); | |
927 | if (ret < 0) | |
928 | return ret; | |
929 | attrcount += ret; | |
930 | ||
931 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
932 | IIO_SHARED_BY_ALL, | |
933 | &chan->info_mask_shared_by_all); | |
934 | if (ret < 0) | |
935 | return ret; | |
936 | attrcount += ret; | |
937 | ||
5f420b42 LPC |
938 | if (chan->ext_info) { |
939 | unsigned int i = 0; | |
940 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { | |
941 | ret = __iio_add_chan_devattr(ext_info->name, | |
942 | chan, | |
943 | ext_info->read ? | |
944 | &iio_read_channel_ext_info : NULL, | |
945 | ext_info->write ? | |
946 | &iio_write_channel_ext_info : NULL, | |
947 | i, | |
948 | ext_info->shared, | |
949 | &indio_dev->dev, | |
950 | &indio_dev->channel_attr_list); | |
951 | i++; | |
952 | if (ret == -EBUSY && ext_info->shared) | |
953 | continue; | |
954 | ||
955 | if (ret) | |
3704432f | 956 | return ret; |
5f420b42 LPC |
957 | |
958 | attrcount++; | |
959 | } | |
960 | } | |
961 | ||
3704432f | 962 | return attrcount; |
1d892719 JC |
963 | } |
964 | ||
84088ebd LPC |
965 | /** |
966 | * iio_free_chan_devattr_list() - Free a list of IIO device attributes | |
967 | * @attr_list: List of IIO device attributes | |
968 | * | |
969 | * This function frees the memory allocated for each of the IIO device | |
c1b03ab5 | 970 | * attributes in the list. |
84088ebd LPC |
971 | */ |
972 | void iio_free_chan_devattr_list(struct list_head *attr_list) | |
1d892719 | 973 | { |
84088ebd LPC |
974 | struct iio_dev_attr *p, *n; |
975 | ||
976 | list_for_each_entry_safe(p, n, attr_list, l) { | |
977 | kfree(p->dev_attr.attr.name); | |
c1b03ab5 | 978 | list_del(&p->l); |
84088ebd LPC |
979 | kfree(p); |
980 | } | |
1d892719 JC |
981 | } |
982 | ||
1b732888 JC |
983 | static ssize_t iio_show_dev_name(struct device *dev, |
984 | struct device_attribute *attr, | |
985 | char *buf) | |
986 | { | |
e53f5ac5 | 987 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
598db581 | 988 | return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name); |
1b732888 JC |
989 | } |
990 | ||
991 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
992 | ||
f8c6f4e9 | 993 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 994 | { |
26d25ae3 | 995 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
84088ebd | 996 | struct iio_dev_attr *p; |
26d25ae3 | 997 | struct attribute **attr; |
1d892719 | 998 | |
26d25ae3 | 999 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
1000 | if (indio_dev->info->attrs) { |
1001 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
1002 | while (*attr++ != NULL) |
1003 | attrcount_orig++; | |
847ec80b | 1004 | } |
26d25ae3 | 1005 | attrcount = attrcount_orig; |
1d892719 JC |
1006 | /* |
1007 | * New channel registration method - relies on the fact a group does | |
d25b3808 | 1008 | * not need to be initialized if its name is NULL. |
1d892719 | 1009 | */ |
f8c6f4e9 JC |
1010 | if (indio_dev->channels) |
1011 | for (i = 0; i < indio_dev->num_channels; i++) { | |
1012 | ret = iio_device_add_channel_sysfs(indio_dev, | |
1013 | &indio_dev | |
1d892719 JC |
1014 | ->channels[i]); |
1015 | if (ret < 0) | |
1016 | goto error_clear_attrs; | |
26d25ae3 | 1017 | attrcount += ret; |
1d892719 | 1018 | } |
26d25ae3 | 1019 | |
f8c6f4e9 | 1020 | if (indio_dev->name) |
26d25ae3 JC |
1021 | attrcount++; |
1022 | ||
d83fb184 TM |
1023 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
1024 | sizeof(indio_dev->chan_attr_group.attrs[0]), | |
1025 | GFP_KERNEL); | |
f8c6f4e9 | 1026 | if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3 JC |
1027 | ret = -ENOMEM; |
1028 | goto error_clear_attrs; | |
1b732888 | 1029 | } |
26d25ae3 | 1030 | /* Copy across original attributes */ |
f8c6f4e9 JC |
1031 | if (indio_dev->info->attrs) |
1032 | memcpy(indio_dev->chan_attr_group.attrs, | |
1033 | indio_dev->info->attrs->attrs, | |
1034 | sizeof(indio_dev->chan_attr_group.attrs[0]) | |
26d25ae3 JC |
1035 | *attrcount_orig); |
1036 | attrn = attrcount_orig; | |
1037 | /* Add all elements from the list. */ | |
f8c6f4e9 JC |
1038 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
1039 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; | |
1040 | if (indio_dev->name) | |
1041 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; | |
26d25ae3 | 1042 | |
f8c6f4e9 JC |
1043 | indio_dev->groups[indio_dev->groupcounter++] = |
1044 | &indio_dev->chan_attr_group; | |
26d25ae3 | 1045 | |
1d892719 | 1046 | return 0; |
1b732888 | 1047 | |
1d892719 | 1048 | error_clear_attrs: |
84088ebd | 1049 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
1d892719 | 1050 | |
26d25ae3 | 1051 | return ret; |
847ec80b JC |
1052 | } |
1053 | ||
f8c6f4e9 | 1054 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 1055 | { |
1d892719 | 1056 | |
84088ebd | 1057 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
f8c6f4e9 | 1058 | kfree(indio_dev->chan_attr_group.attrs); |
c1b03ab5 | 1059 | indio_dev->chan_attr_group.attrs = NULL; |
847ec80b JC |
1060 | } |
1061 | ||
847ec80b JC |
1062 | static void iio_dev_release(struct device *device) |
1063 | { | |
e53f5ac5 | 1064 | struct iio_dev *indio_dev = dev_to_iio_dev(device); |
735ad074 | 1065 | if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED)) |
f8c6f4e9 JC |
1066 | iio_device_unregister_trigger_consumer(indio_dev); |
1067 | iio_device_unregister_eventset(indio_dev); | |
1068 | iio_device_unregister_sysfs(indio_dev); | |
e407fd65 | 1069 | |
9e69c935 LPC |
1070 | iio_buffer_put(indio_dev->buffer); |
1071 | ||
e407fd65 LPC |
1072 | ida_simple_remove(&iio_ida, indio_dev->id); |
1073 | kfree(indio_dev); | |
847ec80b JC |
1074 | } |
1075 | ||
17d82b47 | 1076 | struct device_type iio_device_type = { |
847ec80b JC |
1077 | .name = "iio_device", |
1078 | .release = iio_dev_release, | |
1079 | }; | |
1080 | ||
a7e57dce SK |
1081 | /** |
1082 | * iio_device_alloc() - allocate an iio_dev from a driver | |
1083 | * @sizeof_priv: Space to allocate for private structure. | |
1084 | **/ | |
7cbb7537 | 1085 | struct iio_dev *iio_device_alloc(int sizeof_priv) |
847ec80b | 1086 | { |
6f7c8ee5 JC |
1087 | struct iio_dev *dev; |
1088 | size_t alloc_size; | |
1089 | ||
1090 | alloc_size = sizeof(struct iio_dev); | |
1091 | if (sizeof_priv) { | |
1092 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); | |
1093 | alloc_size += sizeof_priv; | |
1094 | } | |
1095 | /* ensure 32-byte alignment of whole construct ? */ | |
1096 | alloc_size += IIO_ALIGN - 1; | |
1097 | ||
1098 | dev = kzalloc(alloc_size, GFP_KERNEL); | |
847ec80b JC |
1099 | |
1100 | if (dev) { | |
26d25ae3 | 1101 | dev->dev.groups = dev->groups; |
17d82b47 | 1102 | dev->dev.type = &iio_device_type; |
5aaaeba8 | 1103 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
1104 | device_initialize(&dev->dev); |
1105 | dev_set_drvdata(&dev->dev, (void *)dev); | |
1106 | mutex_init(&dev->mlock); | |
ac917a81 | 1107 | mutex_init(&dev->info_exist_lock); |
e407fd65 | 1108 | INIT_LIST_HEAD(&dev->channel_attr_list); |
a9e39f9e JC |
1109 | |
1110 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); | |
1111 | if (dev->id < 0) { | |
1112 | /* cannot use a dev_err as the name isn't available */ | |
3176dd5d | 1113 | pr_err("failed to get device id\n"); |
a9e39f9e JC |
1114 | kfree(dev); |
1115 | return NULL; | |
1116 | } | |
1117 | dev_set_name(&dev->dev, "iio:device%d", dev->id); | |
84b36ce5 | 1118 | INIT_LIST_HEAD(&dev->buffer_list); |
847ec80b JC |
1119 | } |
1120 | ||
1121 | return dev; | |
1122 | } | |
7cbb7537 | 1123 | EXPORT_SYMBOL(iio_device_alloc); |
847ec80b | 1124 | |
a7e57dce SK |
1125 | /** |
1126 | * iio_device_free() - free an iio_dev from a driver | |
1127 | * @dev: the iio_dev associated with the device | |
1128 | **/ | |
7cbb7537 | 1129 | void iio_device_free(struct iio_dev *dev) |
847ec80b | 1130 | { |
e407fd65 LPC |
1131 | if (dev) |
1132 | put_device(&dev->dev); | |
847ec80b | 1133 | } |
7cbb7537 | 1134 | EXPORT_SYMBOL(iio_device_free); |
847ec80b | 1135 | |
9dabaf5e GS |
1136 | static void devm_iio_device_release(struct device *dev, void *res) |
1137 | { | |
1138 | iio_device_free(*(struct iio_dev **)res); | |
1139 | } | |
1140 | ||
1141 | static int devm_iio_device_match(struct device *dev, void *res, void *data) | |
1142 | { | |
1143 | struct iio_dev **r = res; | |
1144 | if (!r || !*r) { | |
1145 | WARN_ON(!r || !*r); | |
1146 | return 0; | |
1147 | } | |
1148 | return *r == data; | |
1149 | } | |
1150 | ||
a7e57dce SK |
1151 | /** |
1152 | * devm_iio_device_alloc - Resource-managed iio_device_alloc() | |
1153 | * @dev: Device to allocate iio_dev for | |
1154 | * @sizeof_priv: Space to allocate for private structure. | |
1155 | * | |
1156 | * Managed iio_device_alloc. iio_dev allocated with this function is | |
1157 | * automatically freed on driver detach. | |
1158 | * | |
1159 | * If an iio_dev allocated with this function needs to be freed separately, | |
1160 | * devm_iio_device_free() must be used. | |
1161 | * | |
1162 | * RETURNS: | |
1163 | * Pointer to allocated iio_dev on success, NULL on failure. | |
1164 | */ | |
9dabaf5e GS |
1165 | struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv) |
1166 | { | |
1167 | struct iio_dev **ptr, *iio_dev; | |
1168 | ||
1169 | ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr), | |
1170 | GFP_KERNEL); | |
1171 | if (!ptr) | |
1172 | return NULL; | |
1173 | ||
9dabaf5e GS |
1174 | iio_dev = iio_device_alloc(sizeof_priv); |
1175 | if (iio_dev) { | |
1176 | *ptr = iio_dev; | |
1177 | devres_add(dev, ptr); | |
1178 | } else { | |
1179 | devres_free(ptr); | |
1180 | } | |
1181 | ||
1182 | return iio_dev; | |
1183 | } | |
1184 | EXPORT_SYMBOL_GPL(devm_iio_device_alloc); | |
1185 | ||
a7e57dce SK |
1186 | /** |
1187 | * devm_iio_device_free - Resource-managed iio_device_free() | |
1188 | * @dev: Device this iio_dev belongs to | |
1189 | * @iio_dev: the iio_dev associated with the device | |
1190 | * | |
1191 | * Free iio_dev allocated with devm_iio_device_alloc(). | |
1192 | */ | |
9dabaf5e GS |
1193 | void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev) |
1194 | { | |
1195 | int rc; | |
1196 | ||
1197 | rc = devres_release(dev, devm_iio_device_release, | |
1198 | devm_iio_device_match, iio_dev); | |
1199 | WARN_ON(rc); | |
1200 | } | |
1201 | EXPORT_SYMBOL_GPL(devm_iio_device_free); | |
1202 | ||
1aa04278 | 1203 | /** |
14555b14 | 1204 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
2498dcf6 CO |
1205 | * @inode: Inode structure for identifying the device in the file system |
1206 | * @filp: File structure for iio device used to keep and later access | |
1207 | * private data | |
1208 | * | |
1209 | * Return: 0 on success or -EBUSY if the device is already opened | |
1aa04278 JC |
1210 | **/ |
1211 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
1212 | { | |
f8c6f4e9 | 1213 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 1214 | struct iio_dev, chrdev); |
bb01443e LPC |
1215 | |
1216 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
1217 | return -EBUSY; | |
1218 | ||
cadc2125 LPC |
1219 | iio_device_get(indio_dev); |
1220 | ||
f8c6f4e9 | 1221 | filp->private_data = indio_dev; |
30eb82f0 | 1222 | |
79335140 | 1223 | return 0; |
1aa04278 JC |
1224 | } |
1225 | ||
1226 | /** | |
14555b14 | 1227 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
2498dcf6 CO |
1228 | * @inode: Inode structure pointer for the char device |
1229 | * @filp: File structure pointer for the char device | |
1230 | * | |
1231 | * Return: 0 for successful release | |
1232 | */ | |
1aa04278 JC |
1233 | static int iio_chrdev_release(struct inode *inode, struct file *filp) |
1234 | { | |
bb01443e LPC |
1235 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1236 | struct iio_dev, chrdev); | |
bb01443e | 1237 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
cadc2125 LPC |
1238 | iio_device_put(indio_dev); |
1239 | ||
1aa04278 JC |
1240 | return 0; |
1241 | } | |
1242 | ||
1243 | /* Somewhat of a cross file organization violation - ioctls here are actually | |
1244 | * event related */ | |
1245 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1246 | { | |
1247 | struct iio_dev *indio_dev = filp->private_data; | |
1248 | int __user *ip = (int __user *)arg; | |
1249 | int fd; | |
1250 | ||
f18e7a06 LPC |
1251 | if (!indio_dev->info) |
1252 | return -ENODEV; | |
1253 | ||
1aa04278 JC |
1254 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { |
1255 | fd = iio_event_getfd(indio_dev); | |
3f9059b7 LW |
1256 | if (fd < 0) |
1257 | return fd; | |
1aa04278 JC |
1258 | if (copy_to_user(ip, &fd, sizeof(fd))) |
1259 | return -EFAULT; | |
1260 | return 0; | |
1261 | } | |
1262 | return -EINVAL; | |
1263 | } | |
1264 | ||
14555b14 JC |
1265 | static const struct file_operations iio_buffer_fileops = { |
1266 | .read = iio_buffer_read_first_n_outer_addr, | |
1aa04278 JC |
1267 | .release = iio_chrdev_release, |
1268 | .open = iio_chrdev_open, | |
14555b14 | 1269 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
1270 | .owner = THIS_MODULE, |
1271 | .llseek = noop_llseek, | |
1272 | .unlocked_ioctl = iio_ioctl, | |
1273 | .compat_ioctl = iio_ioctl, | |
1274 | }; | |
1275 | ||
8f5d8727 VD |
1276 | static int iio_check_unique_scan_index(struct iio_dev *indio_dev) |
1277 | { | |
1278 | int i, j; | |
1279 | const struct iio_chan_spec *channels = indio_dev->channels; | |
1280 | ||
1281 | if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES)) | |
1282 | return 0; | |
1283 | ||
1284 | for (i = 0; i < indio_dev->num_channels - 1; i++) { | |
1285 | if (channels[i].scan_index < 0) | |
1286 | continue; | |
1287 | for (j = i + 1; j < indio_dev->num_channels; j++) | |
1288 | if (channels[i].scan_index == channels[j].scan_index) { | |
1289 | dev_err(&indio_dev->dev, | |
1290 | "Duplicate scan index %d\n", | |
1291 | channels[i].scan_index); | |
1292 | return -EINVAL; | |
1293 | } | |
1294 | } | |
1295 | ||
1296 | return 0; | |
1297 | } | |
1298 | ||
0f1acee5 MH |
1299 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
1300 | ||
a7e57dce SK |
1301 | /** |
1302 | * iio_device_register() - register a device with the IIO subsystem | |
1303 | * @indio_dev: Device structure filled by the device driver | |
1304 | **/ | |
f8c6f4e9 | 1305 | int iio_device_register(struct iio_dev *indio_dev) |
847ec80b JC |
1306 | { |
1307 | int ret; | |
1308 | ||
17d82b47 GR |
1309 | /* If the calling driver did not initialize of_node, do it here */ |
1310 | if (!indio_dev->dev.of_node && indio_dev->dev.parent) | |
1311 | indio_dev->dev.of_node = indio_dev->dev.parent->of_node; | |
1312 | ||
8f5d8727 VD |
1313 | ret = iio_check_unique_scan_index(indio_dev); |
1314 | if (ret < 0) | |
1315 | return ret; | |
1316 | ||
1aa04278 | 1317 | /* configure elements for the chrdev */ |
f8c6f4e9 | 1318 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 1319 | |
e553f182 MH |
1320 | ret = iio_device_register_debugfs(indio_dev); |
1321 | if (ret) { | |
1322 | dev_err(indio_dev->dev.parent, | |
1323 | "Failed to register debugfs interfaces\n"); | |
92825ff9 | 1324 | return ret; |
e553f182 | 1325 | } |
3e1b6c95 LPC |
1326 | |
1327 | ret = iio_buffer_alloc_sysfs_and_mask(indio_dev); | |
1328 | if (ret) { | |
1329 | dev_err(indio_dev->dev.parent, | |
1330 | "Failed to create buffer sysfs interfaces\n"); | |
1331 | goto error_unreg_debugfs; | |
1332 | } | |
1333 | ||
f8c6f4e9 | 1334 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 1335 | if (ret) { |
f8c6f4e9 | 1336 | dev_err(indio_dev->dev.parent, |
847ec80b | 1337 | "Failed to register sysfs interfaces\n"); |
3e1b6c95 | 1338 | goto error_buffer_free_sysfs; |
847ec80b | 1339 | } |
f8c6f4e9 | 1340 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 1341 | if (ret) { |
f8c6f4e9 | 1342 | dev_err(indio_dev->dev.parent, |
c849d253 | 1343 | "Failed to register event set\n"); |
847ec80b JC |
1344 | goto error_free_sysfs; |
1345 | } | |
735ad074 | 1346 | if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED)) |
f8c6f4e9 | 1347 | iio_device_register_trigger_consumer(indio_dev); |
847ec80b | 1348 | |
0f1acee5 MH |
1349 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
1350 | indio_dev->setup_ops == NULL) | |
1351 | indio_dev->setup_ops = &noop_ring_setup_ops; | |
1352 | ||
f8c6f4e9 JC |
1353 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
1354 | indio_dev->chrdev.owner = indio_dev->info->driver_module; | |
0d5b7dae | 1355 | indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj; |
f8c6f4e9 | 1356 | ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); |
26d25ae3 | 1357 | if (ret < 0) |
0d5b7dae | 1358 | goto error_unreg_eventset; |
847ec80b | 1359 | |
0d5b7dae LPC |
1360 | ret = device_add(&indio_dev->dev); |
1361 | if (ret < 0) | |
1362 | goto error_cdev_del; | |
1363 | ||
1364 | return 0; | |
1365 | error_cdev_del: | |
1366 | cdev_del(&indio_dev->chrdev); | |
26d25ae3 | 1367 | error_unreg_eventset: |
f8c6f4e9 | 1368 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 1369 | error_free_sysfs: |
f8c6f4e9 | 1370 | iio_device_unregister_sysfs(indio_dev); |
3e1b6c95 LPC |
1371 | error_buffer_free_sysfs: |
1372 | iio_buffer_free_sysfs_and_mask(indio_dev); | |
e553f182 MH |
1373 | error_unreg_debugfs: |
1374 | iio_device_unregister_debugfs(indio_dev); | |
847ec80b JC |
1375 | return ret; |
1376 | } | |
1377 | EXPORT_SYMBOL(iio_device_register); | |
1378 | ||
a7e57dce SK |
1379 | /** |
1380 | * iio_device_unregister() - unregister a device from the IIO subsystem | |
1381 | * @indio_dev: Device structure representing the device. | |
1382 | **/ | |
f8c6f4e9 | 1383 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 1384 | { |
ac917a81 | 1385 | mutex_lock(&indio_dev->info_exist_lock); |
a87c82e4 LPC |
1386 | |
1387 | device_del(&indio_dev->dev); | |
1388 | ||
0d5b7dae LPC |
1389 | if (indio_dev->chrdev.dev) |
1390 | cdev_del(&indio_dev->chrdev); | |
bc4c9612 | 1391 | iio_device_unregister_debugfs(indio_dev); |
0d5b7dae | 1392 | |
a87c82e4 LPC |
1393 | iio_disable_all_buffers(indio_dev); |
1394 | ||
ac917a81 | 1395 | indio_dev->info = NULL; |
d2f0a48f LPC |
1396 | |
1397 | iio_device_wakeup_eventset(indio_dev); | |
1398 | iio_buffer_wakeup_poll(indio_dev); | |
1399 | ||
ac917a81 | 1400 | mutex_unlock(&indio_dev->info_exist_lock); |
3e1b6c95 LPC |
1401 | |
1402 | iio_buffer_free_sysfs_and_mask(indio_dev); | |
847ec80b JC |
1403 | } |
1404 | EXPORT_SYMBOL(iio_device_unregister); | |
8caa07c0 SK |
1405 | |
1406 | static void devm_iio_device_unreg(struct device *dev, void *res) | |
1407 | { | |
1408 | iio_device_unregister(*(struct iio_dev **)res); | |
1409 | } | |
1410 | ||
1411 | /** | |
1412 | * devm_iio_device_register - Resource-managed iio_device_register() | |
1413 | * @dev: Device to allocate iio_dev for | |
1414 | * @indio_dev: Device structure filled by the device driver | |
1415 | * | |
1416 | * Managed iio_device_register. The IIO device registered with this | |
1417 | * function is automatically unregistered on driver detach. This function | |
1418 | * calls iio_device_register() internally. Refer to that function for more | |
1419 | * information. | |
1420 | * | |
1421 | * If an iio_dev registered with this function needs to be unregistered | |
1422 | * separately, devm_iio_device_unregister() must be used. | |
1423 | * | |
1424 | * RETURNS: | |
1425 | * 0 on success, negative error number on failure. | |
1426 | */ | |
1427 | int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev) | |
1428 | { | |
1429 | struct iio_dev **ptr; | |
1430 | int ret; | |
1431 | ||
1432 | ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL); | |
1433 | if (!ptr) | |
1434 | return -ENOMEM; | |
1435 | ||
1436 | *ptr = indio_dev; | |
1437 | ret = iio_device_register(indio_dev); | |
1438 | if (!ret) | |
1439 | devres_add(dev, ptr); | |
1440 | else | |
1441 | devres_free(ptr); | |
1442 | ||
1443 | return ret; | |
1444 | } | |
1445 | EXPORT_SYMBOL_GPL(devm_iio_device_register); | |
1446 | ||
1447 | /** | |
1448 | * devm_iio_device_unregister - Resource-managed iio_device_unregister() | |
1449 | * @dev: Device this iio_dev belongs to | |
1450 | * @indio_dev: the iio_dev associated with the device | |
1451 | * | |
1452 | * Unregister iio_dev registered with devm_iio_device_register(). | |
1453 | */ | |
1454 | void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev) | |
1455 | { | |
1456 | int rc; | |
1457 | ||
1458 | rc = devres_release(dev, devm_iio_device_unreg, | |
1459 | devm_iio_device_match, indio_dev); | |
1460 | WARN_ON(rc); | |
1461 | } | |
1462 | EXPORT_SYMBOL_GPL(devm_iio_device_unregister); | |
1463 | ||
08a33805 AS |
1464 | /** |
1465 | * iio_device_claim_direct_mode - Keep device in direct mode | |
1466 | * @indio_dev: the iio_dev associated with the device | |
1467 | * | |
1468 | * If the device is in direct mode it is guaranteed to stay | |
1469 | * that way until iio_device_release_direct_mode() is called. | |
1470 | * | |
1471 | * Use with iio_device_release_direct_mode() | |
1472 | * | |
1473 | * Returns: 0 on success, -EBUSY on failure | |
1474 | */ | |
1475 | int iio_device_claim_direct_mode(struct iio_dev *indio_dev) | |
1476 | { | |
1477 | mutex_lock(&indio_dev->mlock); | |
1478 | ||
1479 | if (iio_buffer_enabled(indio_dev)) { | |
1480 | mutex_unlock(&indio_dev->mlock); | |
1481 | return -EBUSY; | |
1482 | } | |
1483 | return 0; | |
1484 | } | |
1485 | EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode); | |
1486 | ||
1487 | /** | |
1488 | * iio_device_release_direct_mode - releases claim on direct mode | |
1489 | * @indio_dev: the iio_dev associated with the device | |
1490 | * | |
1491 | * Release the claim. Device is no longer guaranteed to stay | |
1492 | * in direct mode. | |
1493 | * | |
1494 | * Use with iio_device_claim_direct_mode() | |
1495 | */ | |
1496 | void iio_device_release_direct_mode(struct iio_dev *indio_dev) | |
1497 | { | |
1498 | mutex_unlock(&indio_dev->mlock); | |
1499 | } | |
1500 | EXPORT_SYMBOL_GPL(iio_device_release_direct_mode); | |
1501 | ||
847ec80b JC |
1502 | subsys_initcall(iio_init); |
1503 | module_exit(iio_exit); | |
1504 | ||
c8b95952 | 1505 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
847ec80b JC |
1506 | MODULE_DESCRIPTION("Industrial I/O core"); |
1507 | MODULE_LICENSE("GPL"); |