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