1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * The industrial I/O core |
4 | * |
5 | * Copyright (c) 2008 Jonathan Cameron |
6 | * |
7 | * Based on elements of hwmon and input subsystems. |
8 | */ |
9 | |
10 | #define pr_fmt(fmt) "iio-core: " fmt |
11 | |
12 | #include <linux/anon_inodes.h> |
13 | #include <linux/cdev.h> |
14 | #include <linux/debugfs.h> |
15 | #include <linux/device.h> |
16 | #include <linux/err.h> |
17 | #include <linux/fs.h> |
18 | #include <linux/idr.h> |
19 | #include <linux/kdev_t.h> |
20 | #include <linux/kernel.h> |
21 | #include <linux/module.h> |
22 | #include <linux/mutex.h> |
23 | #include <linux/poll.h> |
24 | #include <linux/property.h> |
25 | #include <linux/sched.h> |
26 | #include <linux/slab.h> |
27 | #include <linux/wait.h> |
28 | |
29 | #include <linux/iio/buffer.h> |
30 | #include <linux/iio/buffer_impl.h> |
31 | #include <linux/iio/events.h> |
32 | #include <linux/iio/iio-opaque.h> |
33 | #include <linux/iio/iio.h> |
34 | #include <linux/iio/sysfs.h> |
35 | |
36 | #include "iio_core.h" |
37 | #include "iio_core_trigger.h" |
38 | |
39 | /* IDA to assign each registered device a unique id */ |
40 | static DEFINE_IDA(iio_ida); |
41 | |
42 | static dev_t iio_devt; |
43 | |
44 | #define IIO_DEV_MAX 256 |
45 | struct bus_type iio_bus_type = { |
46 | .name = "iio" , |
47 | }; |
48 | EXPORT_SYMBOL(iio_bus_type); |
49 | |
50 | static struct dentry *iio_debugfs_dentry; |
51 | |
52 | static const char * const iio_direction[] = { |
53 | [0] = "in" , |
54 | [1] = "out" , |
55 | }; |
56 | |
57 | static const char * const iio_chan_type_name_spec[] = { |
58 | [IIO_VOLTAGE] = "voltage" , |
59 | [IIO_CURRENT] = "current" , |
60 | [IIO_POWER] = "power" , |
61 | [IIO_ACCEL] = "accel" , |
62 | [IIO_ANGL_VEL] = "anglvel" , |
63 | [IIO_MAGN] = "magn" , |
64 | [IIO_LIGHT] = "illuminance" , |
65 | [IIO_INTENSITY] = "intensity" , |
66 | [IIO_PROXIMITY] = "proximity" , |
67 | [IIO_TEMP] = "temp" , |
68 | [IIO_INCLI] = "incli" , |
69 | [IIO_ROT] = "rot" , |
70 | [IIO_ANGL] = "angl" , |
71 | [IIO_TIMESTAMP] = "timestamp" , |
72 | [IIO_CAPACITANCE] = "capacitance" , |
73 | [IIO_ALTVOLTAGE] = "altvoltage" , |
74 | [IIO_CCT] = "cct" , |
75 | [IIO_PRESSURE] = "pressure" , |
76 | [IIO_HUMIDITYRELATIVE] = "humidityrelative" , |
77 | [IIO_ACTIVITY] = "activity" , |
78 | [IIO_STEPS] = "steps" , |
79 | [IIO_ENERGY] = "energy" , |
80 | [IIO_DISTANCE] = "distance" , |
81 | [IIO_VELOCITY] = "velocity" , |
82 | [IIO_CONCENTRATION] = "concentration" , |
83 | [IIO_RESISTANCE] = "resistance" , |
84 | [IIO_PH] = "ph" , |
85 | [IIO_UVINDEX] = "uvindex" , |
86 | [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity" , |
87 | [IIO_COUNT] = "count" , |
88 | [IIO_INDEX] = "index" , |
89 | [IIO_GRAVITY] = "gravity" , |
90 | [IIO_POSITIONRELATIVE] = "positionrelative" , |
91 | [IIO_PHASE] = "phase" , |
92 | [IIO_MASSCONCENTRATION] = "massconcentration" , |
93 | [IIO_DELTA_ANGL] = "deltaangl" , |
94 | [IIO_DELTA_VELOCITY] = "deltavelocity" , |
95 | [IIO_COLORTEMP] = "colortemp" , |
96 | [IIO_CHROMATICITY] = "chromaticity" , |
97 | }; |
98 | |
99 | static const char * const iio_modifier_names[] = { |
100 | [IIO_MOD_X] = "x" , |
101 | [IIO_MOD_Y] = "y" , |
102 | [IIO_MOD_Z] = "z" , |
103 | [IIO_MOD_X_AND_Y] = "x&y" , |
104 | [IIO_MOD_X_AND_Z] = "x&z" , |
105 | [IIO_MOD_Y_AND_Z] = "y&z" , |
106 | [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z" , |
107 | [IIO_MOD_X_OR_Y] = "x|y" , |
108 | [IIO_MOD_X_OR_Z] = "x|z" , |
109 | [IIO_MOD_Y_OR_Z] = "y|z" , |
110 | [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z" , |
111 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)" , |
112 | [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2" , |
113 | [IIO_MOD_LIGHT_BOTH] = "both" , |
114 | [IIO_MOD_LIGHT_IR] = "ir" , |
115 | [IIO_MOD_LIGHT_CLEAR] = "clear" , |
116 | [IIO_MOD_LIGHT_RED] = "red" , |
117 | [IIO_MOD_LIGHT_GREEN] = "green" , |
118 | [IIO_MOD_LIGHT_BLUE] = "blue" , |
119 | [IIO_MOD_LIGHT_UV] = "uv" , |
120 | [IIO_MOD_LIGHT_DUV] = "duv" , |
121 | [IIO_MOD_QUATERNION] = "quaternion" , |
122 | [IIO_MOD_TEMP_AMBIENT] = "ambient" , |
123 | [IIO_MOD_TEMP_OBJECT] = "object" , |
124 | [IIO_MOD_NORTH_MAGN] = "from_north_magnetic" , |
125 | [IIO_MOD_NORTH_TRUE] = "from_north_true" , |
126 | [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp" , |
127 | [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp" , |
128 | [IIO_MOD_RUNNING] = "running" , |
129 | [IIO_MOD_JOGGING] = "jogging" , |
130 | [IIO_MOD_WALKING] = "walking" , |
131 | [IIO_MOD_STILL] = "still" , |
132 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)" , |
133 | [IIO_MOD_I] = "i" , |
134 | [IIO_MOD_Q] = "q" , |
135 | [IIO_MOD_CO2] = "co2" , |
136 | [IIO_MOD_VOC] = "voc" , |
137 | [IIO_MOD_PM1] = "pm1" , |
138 | [IIO_MOD_PM2P5] = "pm2p5" , |
139 | [IIO_MOD_PM4] = "pm4" , |
140 | [IIO_MOD_PM10] = "pm10" , |
141 | [IIO_MOD_ETHANOL] = "ethanol" , |
142 | [IIO_MOD_H2] = "h2" , |
143 | [IIO_MOD_O2] = "o2" , |
144 | [IIO_MOD_LINEAR_X] = "linear_x" , |
145 | [IIO_MOD_LINEAR_Y] = "linear_y" , |
146 | [IIO_MOD_LINEAR_Z] = "linear_z" , |
147 | [IIO_MOD_PITCH] = "pitch" , |
148 | [IIO_MOD_YAW] = "yaw" , |
149 | [IIO_MOD_ROLL] = "roll" , |
150 | }; |
151 | |
152 | /* relies on pairs of these shared then separate */ |
153 | static const char * const iio_chan_info_postfix[] = { |
154 | [IIO_CHAN_INFO_RAW] = "raw" , |
155 | [IIO_CHAN_INFO_PROCESSED] = "input" , |
156 | [IIO_CHAN_INFO_SCALE] = "scale" , |
157 | [IIO_CHAN_INFO_OFFSET] = "offset" , |
158 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale" , |
159 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias" , |
160 | [IIO_CHAN_INFO_PEAK] = "peak_raw" , |
161 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale" , |
162 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw" , |
163 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw" , |
164 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
165 | = "filter_low_pass_3db_frequency" , |
166 | [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY] |
167 | = "filter_high_pass_3db_frequency" , |
168 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency" , |
169 | [IIO_CHAN_INFO_FREQUENCY] = "frequency" , |
170 | [IIO_CHAN_INFO_PHASE] = "phase" , |
171 | [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain" , |
172 | [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis" , |
173 | [IIO_CHAN_INFO_HYSTERESIS_RELATIVE] = "hysteresis_relative" , |
174 | [IIO_CHAN_INFO_INT_TIME] = "integration_time" , |
175 | [IIO_CHAN_INFO_ENABLE] = "en" , |
176 | [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight" , |
177 | [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight" , |
178 | [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count" , |
179 | [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time" , |
180 | [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity" , |
181 | [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio" , |
182 | [IIO_CHAN_INFO_THERMOCOUPLE_TYPE] = "thermocouple_type" , |
183 | [IIO_CHAN_INFO_CALIBAMBIENT] = "calibambient" , |
184 | [IIO_CHAN_INFO_ZEROPOINT] = "zeropoint" , |
185 | }; |
186 | /** |
187 | * iio_device_id() - query the unique ID for the device |
188 | * @indio_dev: Device structure whose ID is being queried |
189 | * |
190 | * The IIO device ID is a unique index used for example for the naming |
191 | * of the character device /dev/iio\:device[ID]. |
192 | * |
193 | * Returns: Unique ID for the device. |
194 | */ |
195 | int iio_device_id(struct iio_dev *indio_dev) |
196 | { |
197 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
198 | |
199 | return iio_dev_opaque->id; |
200 | } |
201 | EXPORT_SYMBOL_GPL(iio_device_id); |
202 | |
203 | /** |
204 | * iio_buffer_enabled() - helper function to test if the buffer is enabled |
205 | * @indio_dev: IIO device structure for device |
206 | * |
207 | * Returns: True, if the buffer is enabled. |
208 | */ |
209 | bool iio_buffer_enabled(struct iio_dev *indio_dev) |
210 | { |
211 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
212 | |
213 | return iio_dev_opaque->currentmode & |
214 | (INDIO_BUFFER_HARDWARE | INDIO_BUFFER_SOFTWARE | |
215 | INDIO_BUFFER_TRIGGERED); |
216 | } |
217 | EXPORT_SYMBOL_GPL(iio_buffer_enabled); |
218 | |
219 | #if defined(CONFIG_DEBUG_FS) |
220 | /* |
221 | * There's also a CONFIG_DEBUG_FS guard in include/linux/iio/iio.h for |
222 | * iio_get_debugfs_dentry() to make it inline if CONFIG_DEBUG_FS is undefined |
223 | */ |
224 | struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev) |
225 | { |
226 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
227 | |
228 | return iio_dev_opaque->debugfs_dentry; |
229 | } |
230 | EXPORT_SYMBOL_GPL(iio_get_debugfs_dentry); |
231 | #endif |
232 | |
233 | /** |
234 | * iio_find_channel_from_si() - get channel from its scan index |
235 | * @indio_dev: device |
236 | * @si: scan index to match |
237 | * |
238 | * Returns: |
239 | * Constant pointer to iio_chan_spec, if scan index matches, NULL on failure. |
240 | */ |
241 | const struct iio_chan_spec |
242 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) |
243 | { |
244 | int i; |
245 | |
246 | for (i = 0; i < indio_dev->num_channels; i++) |
247 | if (indio_dev->channels[i].scan_index == si) |
248 | return &indio_dev->channels[i]; |
249 | return NULL; |
250 | } |
251 | |
252 | /* This turns up an awful lot */ |
253 | ssize_t iio_read_const_attr(struct device *dev, |
254 | struct device_attribute *attr, |
255 | char *buf) |
256 | { |
257 | return sysfs_emit(buf, fmt: "%s\n" , to_iio_const_attr(attr)->string); |
258 | } |
259 | EXPORT_SYMBOL(iio_read_const_attr); |
260 | |
261 | /** |
262 | * iio_device_set_clock() - Set current timestamping clock for the device |
263 | * @indio_dev: IIO device structure containing the device |
264 | * @clock_id: timestamping clock POSIX identifier to set. |
265 | * |
266 | * Returns: 0 on success, or a negative error code. |
267 | */ |
268 | int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id) |
269 | { |
270 | int ret; |
271 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
272 | const struct iio_event_interface *ev_int = iio_dev_opaque->event_interface; |
273 | |
274 | ret = mutex_lock_interruptible(&iio_dev_opaque->mlock); |
275 | if (ret) |
276 | return ret; |
277 | if ((ev_int && iio_event_enabled(ev_int)) || |
278 | iio_buffer_enabled(indio_dev)) { |
279 | mutex_unlock(lock: &iio_dev_opaque->mlock); |
280 | return -EBUSY; |
281 | } |
282 | iio_dev_opaque->clock_id = clock_id; |
283 | mutex_unlock(lock: &iio_dev_opaque->mlock); |
284 | |
285 | return 0; |
286 | } |
287 | EXPORT_SYMBOL(iio_device_set_clock); |
288 | |
289 | /** |
290 | * iio_device_get_clock() - Retrieve current timestamping clock for the device |
291 | * @indio_dev: IIO device structure containing the device |
292 | * |
293 | * Returns: Clock ID of the current timestamping clock for the device. |
294 | */ |
295 | clockid_t iio_device_get_clock(const struct iio_dev *indio_dev) |
296 | { |
297 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
298 | |
299 | return iio_dev_opaque->clock_id; |
300 | } |
301 | EXPORT_SYMBOL(iio_device_get_clock); |
302 | |
303 | /** |
304 | * iio_get_time_ns() - utility function to get a time stamp for events etc |
305 | * @indio_dev: device |
306 | * |
307 | * Returns: Timestamp of the event in nanoseconds. |
308 | */ |
309 | s64 iio_get_time_ns(const struct iio_dev *indio_dev) |
310 | { |
311 | struct timespec64 tp; |
312 | |
313 | switch (iio_device_get_clock(indio_dev)) { |
314 | case CLOCK_REALTIME: |
315 | return ktime_get_real_ns(); |
316 | case CLOCK_MONOTONIC: |
317 | return ktime_get_ns(); |
318 | case CLOCK_MONOTONIC_RAW: |
319 | return ktime_get_raw_ns(); |
320 | case CLOCK_REALTIME_COARSE: |
321 | return ktime_to_ns(kt: ktime_get_coarse_real()); |
322 | case CLOCK_MONOTONIC_COARSE: |
323 | ktime_get_coarse_ts64(ts: &tp); |
324 | return timespec64_to_ns(ts: &tp); |
325 | case CLOCK_BOOTTIME: |
326 | return ktime_get_boottime_ns(); |
327 | case CLOCK_TAI: |
328 | return ktime_get_clocktai_ns(); |
329 | default: |
330 | BUG(); |
331 | } |
332 | } |
333 | EXPORT_SYMBOL(iio_get_time_ns); |
334 | |
335 | static int __init iio_init(void) |
336 | { |
337 | int ret; |
338 | |
339 | /* Register sysfs bus */ |
340 | ret = bus_register(bus: &iio_bus_type); |
341 | if (ret < 0) { |
342 | pr_err("could not register bus type\n" ); |
343 | goto error_nothing; |
344 | } |
345 | |
346 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio" ); |
347 | if (ret < 0) { |
348 | pr_err("failed to allocate char dev region\n" ); |
349 | goto error_unregister_bus_type; |
350 | } |
351 | |
352 | iio_debugfs_dentry = debugfs_create_dir(name: "iio" , NULL); |
353 | |
354 | return 0; |
355 | |
356 | error_unregister_bus_type: |
357 | bus_unregister(bus: &iio_bus_type); |
358 | error_nothing: |
359 | return ret; |
360 | } |
361 | |
362 | static void __exit iio_exit(void) |
363 | { |
364 | if (iio_devt) |
365 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); |
366 | bus_unregister(bus: &iio_bus_type); |
367 | debugfs_remove(dentry: iio_debugfs_dentry); |
368 | } |
369 | |
370 | #if defined(CONFIG_DEBUG_FS) |
371 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
372 | size_t count, loff_t *ppos) |
373 | { |
374 | struct iio_dev *indio_dev = file->private_data; |
375 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
376 | unsigned int val = 0; |
377 | int ret; |
378 | |
379 | if (*ppos > 0) |
380 | return simple_read_from_buffer(to: userbuf, count, ppos, |
381 | from: iio_dev_opaque->read_buf, |
382 | available: iio_dev_opaque->read_buf_len); |
383 | |
384 | ret = indio_dev->info->debugfs_reg_access(indio_dev, |
385 | iio_dev_opaque->cached_reg_addr, |
386 | 0, &val); |
387 | if (ret) { |
388 | dev_err(indio_dev->dev.parent, "%s: read failed\n" , __func__); |
389 | return ret; |
390 | } |
391 | |
392 | iio_dev_opaque->read_buf_len = snprintf(buf: iio_dev_opaque->read_buf, |
393 | size: sizeof(iio_dev_opaque->read_buf), |
394 | fmt: "0x%X\n" , val); |
395 | |
396 | return simple_read_from_buffer(to: userbuf, count, ppos, |
397 | from: iio_dev_opaque->read_buf, |
398 | available: iio_dev_opaque->read_buf_len); |
399 | } |
400 | |
401 | static ssize_t iio_debugfs_write_reg(struct file *file, |
402 | const char __user *userbuf, size_t count, loff_t *ppos) |
403 | { |
404 | struct iio_dev *indio_dev = file->private_data; |
405 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
406 | unsigned int reg, val; |
407 | char buf[80]; |
408 | int ret; |
409 | |
410 | count = min(count, sizeof(buf) - 1); |
411 | if (copy_from_user(to: buf, from: userbuf, n: count)) |
412 | return -EFAULT; |
413 | |
414 | buf[count] = 0; |
415 | |
416 | ret = sscanf(buf, "%i %i" , ®, &val); |
417 | |
418 | switch (ret) { |
419 | case 1: |
420 | iio_dev_opaque->cached_reg_addr = reg; |
421 | break; |
422 | case 2: |
423 | iio_dev_opaque->cached_reg_addr = reg; |
424 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, |
425 | val, NULL); |
426 | if (ret) { |
427 | dev_err(indio_dev->dev.parent, "%s: write failed\n" , |
428 | __func__); |
429 | return ret; |
430 | } |
431 | break; |
432 | default: |
433 | return -EINVAL; |
434 | } |
435 | |
436 | return count; |
437 | } |
438 | |
439 | static const struct file_operations iio_debugfs_reg_fops = { |
440 | .open = simple_open, |
441 | .read = iio_debugfs_read_reg, |
442 | .write = iio_debugfs_write_reg, |
443 | }; |
444 | |
445 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) |
446 | { |
447 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
448 | |
449 | debugfs_remove_recursive(dentry: iio_dev_opaque->debugfs_dentry); |
450 | } |
451 | |
452 | static void iio_device_register_debugfs(struct iio_dev *indio_dev) |
453 | { |
454 | struct iio_dev_opaque *iio_dev_opaque; |
455 | |
456 | if (indio_dev->info->debugfs_reg_access == NULL) |
457 | return; |
458 | |
459 | if (!iio_debugfs_dentry) |
460 | return; |
461 | |
462 | iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
463 | |
464 | iio_dev_opaque->debugfs_dentry = |
465 | debugfs_create_dir(name: dev_name(dev: &indio_dev->dev), |
466 | parent: iio_debugfs_dentry); |
467 | |
468 | debugfs_create_file(name: "direct_reg_access" , mode: 0644, |
469 | parent: iio_dev_opaque->debugfs_dentry, data: indio_dev, |
470 | fops: &iio_debugfs_reg_fops); |
471 | } |
472 | #else |
473 | static void iio_device_register_debugfs(struct iio_dev *indio_dev) |
474 | { |
475 | } |
476 | |
477 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) |
478 | { |
479 | } |
480 | #endif /* CONFIG_DEBUG_FS */ |
481 | |
482 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
483 | struct device_attribute *attr, |
484 | char *buf) |
485 | { |
486 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
487 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
488 | const struct iio_chan_spec_ext_info *ext_info; |
489 | |
490 | ext_info = &this_attr->c->ext_info[this_attr->address]; |
491 | |
492 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
493 | } |
494 | |
495 | static ssize_t iio_write_channel_ext_info(struct device *dev, |
496 | struct device_attribute *attr, |
497 | const char *buf, size_t len) |
498 | { |
499 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
500 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
501 | const struct iio_chan_spec_ext_info *ext_info; |
502 | |
503 | ext_info = &this_attr->c->ext_info[this_attr->address]; |
504 | |
505 | return ext_info->write(indio_dev, ext_info->private, |
506 | this_attr->c, buf, len); |
507 | } |
508 | |
509 | ssize_t iio_enum_available_read(struct iio_dev *indio_dev, |
510 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) |
511 | { |
512 | const struct iio_enum *e = (const struct iio_enum *)priv; |
513 | unsigned int i; |
514 | size_t len = 0; |
515 | |
516 | if (!e->num_items) |
517 | return 0; |
518 | |
519 | for (i = 0; i < e->num_items; ++i) { |
520 | if (!e->items[i]) |
521 | continue; |
522 | len += sysfs_emit_at(buf, at: len, fmt: "%s " , e->items[i]); |
523 | } |
524 | |
525 | /* replace last space with a newline */ |
526 | buf[len - 1] = '\n'; |
527 | |
528 | return len; |
529 | } |
530 | EXPORT_SYMBOL_GPL(iio_enum_available_read); |
531 | |
532 | ssize_t iio_enum_read(struct iio_dev *indio_dev, |
533 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) |
534 | { |
535 | const struct iio_enum *e = (const struct iio_enum *)priv; |
536 | int i; |
537 | |
538 | if (!e->get) |
539 | return -EINVAL; |
540 | |
541 | i = e->get(indio_dev, chan); |
542 | if (i < 0) |
543 | return i; |
544 | if (i >= e->num_items || !e->items[i]) |
545 | return -EINVAL; |
546 | |
547 | return sysfs_emit(buf, fmt: "%s\n" , e->items[i]); |
548 | } |
549 | EXPORT_SYMBOL_GPL(iio_enum_read); |
550 | |
551 | ssize_t iio_enum_write(struct iio_dev *indio_dev, |
552 | uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, |
553 | size_t len) |
554 | { |
555 | const struct iio_enum *e = (const struct iio_enum *)priv; |
556 | int ret; |
557 | |
558 | if (!e->set) |
559 | return -EINVAL; |
560 | |
561 | ret = __sysfs_match_string(array: e->items, n: e->num_items, s: buf); |
562 | if (ret < 0) |
563 | return ret; |
564 | |
565 | ret = e->set(indio_dev, chan, ret); |
566 | return ret ? ret : len; |
567 | } |
568 | EXPORT_SYMBOL_GPL(iio_enum_write); |
569 | |
570 | static const struct iio_mount_matrix iio_mount_idmatrix = { |
571 | .rotation = { |
572 | "1" , "0" , "0" , |
573 | "0" , "1" , "0" , |
574 | "0" , "0" , "1" |
575 | } |
576 | }; |
577 | |
578 | static int iio_setup_mount_idmatrix(const struct device *dev, |
579 | struct iio_mount_matrix *matrix) |
580 | { |
581 | *matrix = iio_mount_idmatrix; |
582 | dev_info(dev, "mounting matrix not found: using identity...\n" ); |
583 | return 0; |
584 | } |
585 | |
586 | ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv, |
587 | const struct iio_chan_spec *chan, char *buf) |
588 | { |
589 | const struct iio_mount_matrix *mtx; |
590 | |
591 | mtx = ((iio_get_mount_matrix_t *)priv)(indio_dev, chan); |
592 | if (IS_ERR(ptr: mtx)) |
593 | return PTR_ERR(ptr: mtx); |
594 | |
595 | if (!mtx) |
596 | mtx = &iio_mount_idmatrix; |
597 | |
598 | return sysfs_emit(buf, fmt: "%s, %s, %s; %s, %s, %s; %s, %s, %s\n" , |
599 | mtx->rotation[0], mtx->rotation[1], mtx->rotation[2], |
600 | mtx->rotation[3], mtx->rotation[4], mtx->rotation[5], |
601 | mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]); |
602 | } |
603 | EXPORT_SYMBOL_GPL(iio_show_mount_matrix); |
604 | |
605 | /** |
606 | * iio_read_mount_matrix() - retrieve iio device mounting matrix from |
607 | * device "mount-matrix" property |
608 | * @dev: device the mounting matrix property is assigned to |
609 | * @matrix: where to store retrieved matrix |
610 | * |
611 | * If device is assigned no mounting matrix property, a default 3x3 identity |
612 | * matrix will be filled in. |
613 | * |
614 | * Returns: 0 if success, or a negative error code on failure. |
615 | */ |
616 | int iio_read_mount_matrix(struct device *dev, struct iio_mount_matrix *matrix) |
617 | { |
618 | size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation); |
619 | int err; |
620 | |
621 | err = device_property_read_string_array(dev, propname: "mount-matrix" , val: matrix->rotation, nval: len); |
622 | if (err == len) |
623 | return 0; |
624 | |
625 | if (err >= 0) |
626 | /* Invalid number of matrix entries. */ |
627 | return -EINVAL; |
628 | |
629 | if (err != -EINVAL) |
630 | /* Invalid matrix declaration format. */ |
631 | return err; |
632 | |
633 | /* Matrix was not declared at all: fallback to identity. */ |
634 | return iio_setup_mount_idmatrix(dev, matrix); |
635 | } |
636 | EXPORT_SYMBOL(iio_read_mount_matrix); |
637 | |
638 | static ssize_t __iio_format_value(char *buf, size_t offset, unsigned int type, |
639 | int size, const int *vals) |
640 | { |
641 | int tmp0, tmp1; |
642 | s64 tmp2; |
643 | bool scale_db = false; |
644 | |
645 | switch (type) { |
646 | case IIO_VAL_INT: |
647 | return sysfs_emit_at(buf, at: offset, fmt: "%d" , vals[0]); |
648 | case IIO_VAL_INT_PLUS_MICRO_DB: |
649 | scale_db = true; |
650 | fallthrough; |
651 | case IIO_VAL_INT_PLUS_MICRO: |
652 | if (vals[1] < 0) |
653 | return sysfs_emit_at(buf, at: offset, fmt: "-%d.%06u%s" , |
654 | abs(vals[0]), -vals[1], |
655 | scale_db ? " dB" : "" ); |
656 | else |
657 | return sysfs_emit_at(buf, at: offset, fmt: "%d.%06u%s" , vals[0], |
658 | vals[1], scale_db ? " dB" : "" ); |
659 | case IIO_VAL_INT_PLUS_NANO: |
660 | if (vals[1] < 0) |
661 | return sysfs_emit_at(buf, at: offset, fmt: "-%d.%09u" , |
662 | abs(vals[0]), -vals[1]); |
663 | else |
664 | return sysfs_emit_at(buf, at: offset, fmt: "%d.%09u" , vals[0], |
665 | vals[1]); |
666 | case IIO_VAL_FRACTIONAL: |
667 | tmp2 = div_s64(dividend: (s64)vals[0] * 1000000000LL, divisor: vals[1]); |
668 | tmp1 = vals[1]; |
669 | tmp0 = (int)div_s64_rem(dividend: tmp2, divisor: 1000000000, remainder: &tmp1); |
670 | if ((tmp2 < 0) && (tmp0 == 0)) |
671 | return sysfs_emit_at(buf, at: offset, fmt: "-0.%09u" , abs(tmp1)); |
672 | else |
673 | return sysfs_emit_at(buf, at: offset, fmt: "%d.%09u" , tmp0, |
674 | abs(tmp1)); |
675 | case IIO_VAL_FRACTIONAL_LOG2: |
676 | tmp2 = shift_right((s64)vals[0] * 1000000000LL, vals[1]); |
677 | tmp0 = (int)div_s64_rem(dividend: tmp2, divisor: 1000000000LL, remainder: &tmp1); |
678 | if (tmp0 == 0 && tmp2 < 0) |
679 | return sysfs_emit_at(buf, at: offset, fmt: "-0.%09u" , abs(tmp1)); |
680 | else |
681 | return sysfs_emit_at(buf, at: offset, fmt: "%d.%09u" , tmp0, |
682 | abs(tmp1)); |
683 | case IIO_VAL_INT_MULTIPLE: |
684 | { |
685 | int i; |
686 | int l = 0; |
687 | |
688 | for (i = 0; i < size; ++i) |
689 | l += sysfs_emit_at(buf, at: offset + l, fmt: "%d " , vals[i]); |
690 | return l; |
691 | } |
692 | case IIO_VAL_CHAR: |
693 | return sysfs_emit_at(buf, at: offset, fmt: "%c" , (char)vals[0]); |
694 | case IIO_VAL_INT_64: |
695 | tmp2 = (s64)((((u64)vals[1]) << 32) | (u32)vals[0]); |
696 | return sysfs_emit_at(buf, at: offset, fmt: "%lld" , tmp2); |
697 | default: |
698 | return 0; |
699 | } |
700 | } |
701 | |
702 | /** |
703 | * iio_format_value() - Formats a IIO value into its string representation |
704 | * @buf: The buffer to which the formatted value gets written |
705 | * which is assumed to be big enough (i.e. PAGE_SIZE). |
706 | * @type: One of the IIO_VAL_* constants. This decides how the val |
707 | * and val2 parameters are formatted. |
708 | * @size: Number of IIO value entries contained in vals |
709 | * @vals: Pointer to the values, exact meaning depends on the |
710 | * type parameter. |
711 | * |
712 | * Returns: |
713 | * 0 by default, a negative number on failure or the total number of characters |
714 | * written for a type that belongs to the IIO_VAL_* constant. |
715 | */ |
716 | ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) |
717 | { |
718 | ssize_t len; |
719 | |
720 | len = __iio_format_value(buf, offset: 0, type, size, vals); |
721 | if (len >= PAGE_SIZE - 1) |
722 | return -EFBIG; |
723 | |
724 | return len + sysfs_emit_at(buf, at: len, fmt: "\n" ); |
725 | } |
726 | EXPORT_SYMBOL_GPL(iio_format_value); |
727 | |
728 | static ssize_t iio_read_channel_label(struct device *dev, |
729 | struct device_attribute *attr, |
730 | char *buf) |
731 | { |
732 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
733 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
734 | |
735 | if (indio_dev->info->read_label) |
736 | return indio_dev->info->read_label(indio_dev, this_attr->c, buf); |
737 | |
738 | if (this_attr->c->extend_name) |
739 | return sysfs_emit(buf, fmt: "%s\n" , this_attr->c->extend_name); |
740 | |
741 | return -EINVAL; |
742 | } |
743 | |
744 | static ssize_t iio_read_channel_info(struct device *dev, |
745 | struct device_attribute *attr, |
746 | char *buf) |
747 | { |
748 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
749 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
750 | int vals[INDIO_MAX_RAW_ELEMENTS]; |
751 | int ret; |
752 | int val_len = 2; |
753 | |
754 | if (indio_dev->info->read_raw_multi) |
755 | ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c, |
756 | INDIO_MAX_RAW_ELEMENTS, |
757 | vals, &val_len, |
758 | this_attr->address); |
759 | else |
760 | ret = indio_dev->info->read_raw(indio_dev, this_attr->c, |
761 | &vals[0], &vals[1], this_attr->address); |
762 | |
763 | if (ret < 0) |
764 | return ret; |
765 | |
766 | return iio_format_value(buf, ret, val_len, vals); |
767 | } |
768 | |
769 | static ssize_t iio_format_list(char *buf, const int *vals, int type, int length, |
770 | const char *prefix, const char *suffix) |
771 | { |
772 | ssize_t len; |
773 | int stride; |
774 | int i; |
775 | |
776 | switch (type) { |
777 | case IIO_VAL_INT: |
778 | stride = 1; |
779 | break; |
780 | default: |
781 | stride = 2; |
782 | break; |
783 | } |
784 | |
785 | len = sysfs_emit(buf, fmt: prefix); |
786 | |
787 | for (i = 0; i <= length - stride; i += stride) { |
788 | if (i != 0) { |
789 | len += sysfs_emit_at(buf, at: len, fmt: " " ); |
790 | if (len >= PAGE_SIZE) |
791 | return -EFBIG; |
792 | } |
793 | |
794 | len += __iio_format_value(buf, offset: len, type, size: stride, vals: &vals[i]); |
795 | if (len >= PAGE_SIZE) |
796 | return -EFBIG; |
797 | } |
798 | |
799 | len += sysfs_emit_at(buf, at: len, fmt: "%s\n" , suffix); |
800 | |
801 | return len; |
802 | } |
803 | |
804 | static ssize_t iio_format_avail_list(char *buf, const int *vals, |
805 | int type, int length) |
806 | { |
807 | |
808 | return iio_format_list(buf, vals, type, length, prefix: "" , suffix: "" ); |
809 | } |
810 | |
811 | static ssize_t iio_format_avail_range(char *buf, const int *vals, int type) |
812 | { |
813 | int length; |
814 | |
815 | /* |
816 | * length refers to the array size , not the number of elements. |
817 | * The purpose is to print the range [min , step ,max] so length should |
818 | * be 3 in case of int, and 6 for other types. |
819 | */ |
820 | switch (type) { |
821 | case IIO_VAL_INT: |
822 | length = 3; |
823 | break; |
824 | default: |
825 | length = 6; |
826 | break; |
827 | } |
828 | |
829 | return iio_format_list(buf, vals, type, length, prefix: "[" , suffix: "]" ); |
830 | } |
831 | |
832 | static ssize_t iio_read_channel_info_avail(struct device *dev, |
833 | struct device_attribute *attr, |
834 | char *buf) |
835 | { |
836 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
837 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
838 | const int *vals; |
839 | int ret; |
840 | int length; |
841 | int type; |
842 | |
843 | ret = indio_dev->info->read_avail(indio_dev, this_attr->c, |
844 | &vals, &type, &length, |
845 | this_attr->address); |
846 | |
847 | if (ret < 0) |
848 | return ret; |
849 | switch (ret) { |
850 | case IIO_AVAIL_LIST: |
851 | return iio_format_avail_list(buf, vals, type, length); |
852 | case IIO_AVAIL_RANGE: |
853 | return iio_format_avail_range(buf, vals, type); |
854 | default: |
855 | return -EINVAL; |
856 | } |
857 | } |
858 | |
859 | /** |
860 | * __iio_str_to_fixpoint() - Parse a fixed-point number from a string |
861 | * @str: The string to parse |
862 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 |
863 | * @integer: The integer part of the number |
864 | * @fract: The fractional part of the number |
865 | * @scale_db: True if this should parse as dB |
866 | * |
867 | * Returns: |
868 | * 0 on success, or a negative error code if the string could not be parsed. |
869 | */ |
870 | static int __iio_str_to_fixpoint(const char *str, int fract_mult, |
871 | int *integer, int *fract, bool scale_db) |
872 | { |
873 | int i = 0, f = 0; |
874 | bool integer_part = true, negative = false; |
875 | |
876 | if (fract_mult == 0) { |
877 | *fract = 0; |
878 | |
879 | return kstrtoint(s: str, base: 0, res: integer); |
880 | } |
881 | |
882 | if (str[0] == '-') { |
883 | negative = true; |
884 | str++; |
885 | } else if (str[0] == '+') { |
886 | str++; |
887 | } |
888 | |
889 | while (*str) { |
890 | if ('0' <= *str && *str <= '9') { |
891 | if (integer_part) { |
892 | i = i * 10 + *str - '0'; |
893 | } else { |
894 | f += fract_mult * (*str - '0'); |
895 | fract_mult /= 10; |
896 | } |
897 | } else if (*str == '\n') { |
898 | if (*(str + 1) == '\0') |
899 | break; |
900 | return -EINVAL; |
901 | } else if (!strncmp(str, " dB" , sizeof(" dB" ) - 1) && scale_db) { |
902 | /* Ignore the dB suffix */ |
903 | str += sizeof(" dB" ) - 1; |
904 | continue; |
905 | } else if (!strncmp(str, "dB" , sizeof("dB" ) - 1) && scale_db) { |
906 | /* Ignore the dB suffix */ |
907 | str += sizeof("dB" ) - 1; |
908 | continue; |
909 | } else if (*str == '.' && integer_part) { |
910 | integer_part = false; |
911 | } else { |
912 | return -EINVAL; |
913 | } |
914 | str++; |
915 | } |
916 | |
917 | if (negative) { |
918 | if (i) |
919 | i = -i; |
920 | else |
921 | f = -f; |
922 | } |
923 | |
924 | *integer = i; |
925 | *fract = f; |
926 | |
927 | return 0; |
928 | } |
929 | |
930 | /** |
931 | * iio_str_to_fixpoint() - Parse a fixed-point number from a string |
932 | * @str: The string to parse |
933 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 |
934 | * @integer: The integer part of the number |
935 | * @fract: The fractional part of the number |
936 | * |
937 | * Returns: |
938 | * 0 on success, or a negative error code if the string could not be parsed. |
939 | */ |
940 | int iio_str_to_fixpoint(const char *str, int fract_mult, |
941 | int *integer, int *fract) |
942 | { |
943 | return __iio_str_to_fixpoint(str, fract_mult, integer, fract, scale_db: false); |
944 | } |
945 | EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); |
946 | |
947 | static ssize_t iio_write_channel_info(struct device *dev, |
948 | struct device_attribute *attr, |
949 | const char *buf, |
950 | size_t len) |
951 | { |
952 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
953 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
954 | int ret, fract_mult = 100000; |
955 | int integer, fract = 0; |
956 | bool is_char = false; |
957 | bool scale_db = false; |
958 | |
959 | /* Assumes decimal - precision based on number of digits */ |
960 | if (!indio_dev->info->write_raw) |
961 | return -EINVAL; |
962 | |
963 | if (indio_dev->info->write_raw_get_fmt) |
964 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, |
965 | this_attr->c, this_attr->address)) { |
966 | case IIO_VAL_INT: |
967 | fract_mult = 0; |
968 | break; |
969 | case IIO_VAL_INT_PLUS_MICRO_DB: |
970 | scale_db = true; |
971 | fallthrough; |
972 | case IIO_VAL_INT_PLUS_MICRO: |
973 | fract_mult = 100000; |
974 | break; |
975 | case IIO_VAL_INT_PLUS_NANO: |
976 | fract_mult = 100000000; |
977 | break; |
978 | case IIO_VAL_CHAR: |
979 | is_char = true; |
980 | break; |
981 | default: |
982 | return -EINVAL; |
983 | } |
984 | |
985 | if (is_char) { |
986 | char ch; |
987 | |
988 | if (sscanf(buf, "%c" , &ch) != 1) |
989 | return -EINVAL; |
990 | integer = ch; |
991 | } else { |
992 | ret = __iio_str_to_fixpoint(str: buf, fract_mult, integer: &integer, fract: &fract, |
993 | scale_db); |
994 | if (ret) |
995 | return ret; |
996 | } |
997 | |
998 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
999 | integer, fract, this_attr->address); |
1000 | if (ret) |
1001 | return ret; |
1002 | |
1003 | return len; |
1004 | } |
1005 | |
1006 | static |
1007 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
1008 | const char *postfix, |
1009 | struct iio_chan_spec const *chan, |
1010 | ssize_t (*readfunc)(struct device *dev, |
1011 | struct device_attribute *attr, |
1012 | char *buf), |
1013 | ssize_t (*writefunc)(struct device *dev, |
1014 | struct device_attribute *attr, |
1015 | const char *buf, |
1016 | size_t len), |
1017 | enum iio_shared_by shared_by) |
1018 | { |
1019 | int ret = 0; |
1020 | char *name = NULL; |
1021 | char *full_postfix; |
1022 | |
1023 | sysfs_attr_init(&dev_attr->attr); |
1024 | |
1025 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
1026 | if (chan->modified && (shared_by == IIO_SEPARATE)) { |
1027 | if (chan->extend_name) |
1028 | full_postfix = kasprintf(GFP_KERNEL, fmt: "%s_%s_%s" , |
1029 | iio_modifier_names[chan->channel2], |
1030 | chan->extend_name, |
1031 | postfix); |
1032 | else |
1033 | full_postfix = kasprintf(GFP_KERNEL, fmt: "%s_%s" , |
1034 | iio_modifier_names[chan->channel2], |
1035 | postfix); |
1036 | } else { |
1037 | if (chan->extend_name == NULL || shared_by != IIO_SEPARATE) |
1038 | full_postfix = kstrdup(s: postfix, GFP_KERNEL); |
1039 | else |
1040 | full_postfix = kasprintf(GFP_KERNEL, |
1041 | fmt: "%s_%s" , |
1042 | chan->extend_name, |
1043 | postfix); |
1044 | } |
1045 | if (full_postfix == NULL) |
1046 | return -ENOMEM; |
1047 | |
1048 | if (chan->differential) { /* Differential can not have modifier */ |
1049 | switch (shared_by) { |
1050 | case IIO_SHARED_BY_ALL: |
1051 | name = kasprintf(GFP_KERNEL, fmt: "%s" , full_postfix); |
1052 | break; |
1053 | case IIO_SHARED_BY_DIR: |
1054 | name = kasprintf(GFP_KERNEL, fmt: "%s_%s" , |
1055 | iio_direction[chan->output], |
1056 | full_postfix); |
1057 | break; |
1058 | case IIO_SHARED_BY_TYPE: |
1059 | name = kasprintf(GFP_KERNEL, fmt: "%s_%s-%s_%s" , |
1060 | iio_direction[chan->output], |
1061 | iio_chan_type_name_spec[chan->type], |
1062 | iio_chan_type_name_spec[chan->type], |
1063 | full_postfix); |
1064 | break; |
1065 | case IIO_SEPARATE: |
1066 | if (!chan->indexed) { |
1067 | WARN(1, "Differential channels must be indexed\n" ); |
1068 | ret = -EINVAL; |
1069 | goto error_free_full_postfix; |
1070 | } |
1071 | name = kasprintf(GFP_KERNEL, |
1072 | fmt: "%s_%s%d-%s%d_%s" , |
1073 | iio_direction[chan->output], |
1074 | iio_chan_type_name_spec[chan->type], |
1075 | chan->channel, |
1076 | iio_chan_type_name_spec[chan->type], |
1077 | chan->channel2, |
1078 | full_postfix); |
1079 | break; |
1080 | } |
1081 | } else { /* Single ended */ |
1082 | switch (shared_by) { |
1083 | case IIO_SHARED_BY_ALL: |
1084 | name = kasprintf(GFP_KERNEL, fmt: "%s" , full_postfix); |
1085 | break; |
1086 | case IIO_SHARED_BY_DIR: |
1087 | name = kasprintf(GFP_KERNEL, fmt: "%s_%s" , |
1088 | iio_direction[chan->output], |
1089 | full_postfix); |
1090 | break; |
1091 | case IIO_SHARED_BY_TYPE: |
1092 | name = kasprintf(GFP_KERNEL, fmt: "%s_%s_%s" , |
1093 | iio_direction[chan->output], |
1094 | iio_chan_type_name_spec[chan->type], |
1095 | full_postfix); |
1096 | break; |
1097 | |
1098 | case IIO_SEPARATE: |
1099 | if (chan->indexed) |
1100 | name = kasprintf(GFP_KERNEL, fmt: "%s_%s%d_%s" , |
1101 | iio_direction[chan->output], |
1102 | iio_chan_type_name_spec[chan->type], |
1103 | chan->channel, |
1104 | full_postfix); |
1105 | else |
1106 | name = kasprintf(GFP_KERNEL, fmt: "%s_%s_%s" , |
1107 | iio_direction[chan->output], |
1108 | iio_chan_type_name_spec[chan->type], |
1109 | full_postfix); |
1110 | break; |
1111 | } |
1112 | } |
1113 | if (name == NULL) { |
1114 | ret = -ENOMEM; |
1115 | goto error_free_full_postfix; |
1116 | } |
1117 | dev_attr->attr.name = name; |
1118 | |
1119 | if (readfunc) { |
1120 | dev_attr->attr.mode |= 0444; |
1121 | dev_attr->show = readfunc; |
1122 | } |
1123 | |
1124 | if (writefunc) { |
1125 | dev_attr->attr.mode |= 0200; |
1126 | dev_attr->store = writefunc; |
1127 | } |
1128 | |
1129 | error_free_full_postfix: |
1130 | kfree(objp: full_postfix); |
1131 | |
1132 | return ret; |
1133 | } |
1134 | |
1135 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1136 | { |
1137 | kfree(objp: dev_attr->attr.name); |
1138 | } |
1139 | |
1140 | int __iio_add_chan_devattr(const char *postfix, |
1141 | struct iio_chan_spec const *chan, |
1142 | ssize_t (*readfunc)(struct device *dev, |
1143 | struct device_attribute *attr, |
1144 | char *buf), |
1145 | ssize_t (*writefunc)(struct device *dev, |
1146 | struct device_attribute *attr, |
1147 | const char *buf, |
1148 | size_t len), |
1149 | u64 mask, |
1150 | enum iio_shared_by shared_by, |
1151 | struct device *dev, |
1152 | struct iio_buffer *buffer, |
1153 | struct list_head *attr_list) |
1154 | { |
1155 | int ret; |
1156 | struct iio_dev_attr *iio_attr, *t; |
1157 | |
1158 | iio_attr = kzalloc(size: sizeof(*iio_attr), GFP_KERNEL); |
1159 | if (iio_attr == NULL) |
1160 | return -ENOMEM; |
1161 | ret = __iio_device_attr_init(dev_attr: &iio_attr->dev_attr, |
1162 | postfix, chan, |
1163 | readfunc, writefunc, shared_by); |
1164 | if (ret) |
1165 | goto error_iio_dev_attr_free; |
1166 | iio_attr->c = chan; |
1167 | iio_attr->address = mask; |
1168 | iio_attr->buffer = buffer; |
1169 | list_for_each_entry(t, attr_list, l) |
1170 | if (strcmp(t->dev_attr.attr.name, |
1171 | iio_attr->dev_attr.attr.name) == 0) { |
1172 | if (shared_by == IIO_SEPARATE) |
1173 | dev_err(dev, "tried to double register : %s\n" , |
1174 | t->dev_attr.attr.name); |
1175 | ret = -EBUSY; |
1176 | goto error_device_attr_deinit; |
1177 | } |
1178 | list_add(new: &iio_attr->l, head: attr_list); |
1179 | |
1180 | return 0; |
1181 | |
1182 | error_device_attr_deinit: |
1183 | __iio_device_attr_deinit(dev_attr: &iio_attr->dev_attr); |
1184 | error_iio_dev_attr_free: |
1185 | kfree(objp: iio_attr); |
1186 | return ret; |
1187 | } |
1188 | |
1189 | static int iio_device_add_channel_label(struct iio_dev *indio_dev, |
1190 | struct iio_chan_spec const *chan) |
1191 | { |
1192 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1193 | int ret; |
1194 | |
1195 | if (!indio_dev->info->read_label && !chan->extend_name) |
1196 | return 0; |
1197 | |
1198 | ret = __iio_add_chan_devattr(postfix: "label" , |
1199 | chan, |
1200 | readfunc: &iio_read_channel_label, |
1201 | NULL, |
1202 | mask: 0, |
1203 | shared_by: IIO_SEPARATE, |
1204 | dev: &indio_dev->dev, |
1205 | NULL, |
1206 | attr_list: &iio_dev_opaque->channel_attr_list); |
1207 | if (ret < 0) |
1208 | return ret; |
1209 | |
1210 | return 1; |
1211 | } |
1212 | |
1213 | static int iio_device_add_info_mask_type(struct iio_dev *indio_dev, |
1214 | struct iio_chan_spec const *chan, |
1215 | enum iio_shared_by shared_by, |
1216 | const long *infomask) |
1217 | { |
1218 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1219 | int i, ret, attrcount = 0; |
1220 | |
1221 | for_each_set_bit(i, infomask, sizeof(*infomask)*8) { |
1222 | if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
1223 | return -EINVAL; |
1224 | ret = __iio_add_chan_devattr(postfix: iio_chan_info_postfix[i], |
1225 | chan, |
1226 | readfunc: &iio_read_channel_info, |
1227 | writefunc: &iio_write_channel_info, |
1228 | mask: i, |
1229 | shared_by, |
1230 | dev: &indio_dev->dev, |
1231 | NULL, |
1232 | attr_list: &iio_dev_opaque->channel_attr_list); |
1233 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
1234 | continue; |
1235 | if (ret < 0) |
1236 | return ret; |
1237 | attrcount++; |
1238 | } |
1239 | |
1240 | return attrcount; |
1241 | } |
1242 | |
1243 | static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev, |
1244 | struct iio_chan_spec const *chan, |
1245 | enum iio_shared_by shared_by, |
1246 | const long *infomask) |
1247 | { |
1248 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1249 | int i, ret, attrcount = 0; |
1250 | char *avail_postfix; |
1251 | |
1252 | for_each_set_bit(i, infomask, sizeof(*infomask) * 8) { |
1253 | if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
1254 | return -EINVAL; |
1255 | avail_postfix = kasprintf(GFP_KERNEL, |
1256 | fmt: "%s_available" , |
1257 | iio_chan_info_postfix[i]); |
1258 | if (!avail_postfix) |
1259 | return -ENOMEM; |
1260 | |
1261 | ret = __iio_add_chan_devattr(postfix: avail_postfix, |
1262 | chan, |
1263 | readfunc: &iio_read_channel_info_avail, |
1264 | NULL, |
1265 | mask: i, |
1266 | shared_by, |
1267 | dev: &indio_dev->dev, |
1268 | NULL, |
1269 | attr_list: &iio_dev_opaque->channel_attr_list); |
1270 | kfree(objp: avail_postfix); |
1271 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
1272 | continue; |
1273 | if (ret < 0) |
1274 | return ret; |
1275 | attrcount++; |
1276 | } |
1277 | |
1278 | return attrcount; |
1279 | } |
1280 | |
1281 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, |
1282 | struct iio_chan_spec const *chan) |
1283 | { |
1284 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1285 | int ret, attrcount = 0; |
1286 | const struct iio_chan_spec_ext_info *ext_info; |
1287 | |
1288 | if (chan->channel < 0) |
1289 | return 0; |
1290 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1291 | shared_by: IIO_SEPARATE, |
1292 | infomask: &chan->info_mask_separate); |
1293 | if (ret < 0) |
1294 | return ret; |
1295 | attrcount += ret; |
1296 | |
1297 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1298 | shared_by: IIO_SEPARATE, |
1299 | infomask: &chan->info_mask_separate_available); |
1300 | if (ret < 0) |
1301 | return ret; |
1302 | attrcount += ret; |
1303 | |
1304 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1305 | shared_by: IIO_SHARED_BY_TYPE, |
1306 | infomask: &chan->info_mask_shared_by_type); |
1307 | if (ret < 0) |
1308 | return ret; |
1309 | attrcount += ret; |
1310 | |
1311 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1312 | shared_by: IIO_SHARED_BY_TYPE, |
1313 | infomask: &chan->info_mask_shared_by_type_available); |
1314 | if (ret < 0) |
1315 | return ret; |
1316 | attrcount += ret; |
1317 | |
1318 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1319 | shared_by: IIO_SHARED_BY_DIR, |
1320 | infomask: &chan->info_mask_shared_by_dir); |
1321 | if (ret < 0) |
1322 | return ret; |
1323 | attrcount += ret; |
1324 | |
1325 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1326 | shared_by: IIO_SHARED_BY_DIR, |
1327 | infomask: &chan->info_mask_shared_by_dir_available); |
1328 | if (ret < 0) |
1329 | return ret; |
1330 | attrcount += ret; |
1331 | |
1332 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1333 | shared_by: IIO_SHARED_BY_ALL, |
1334 | infomask: &chan->info_mask_shared_by_all); |
1335 | if (ret < 0) |
1336 | return ret; |
1337 | attrcount += ret; |
1338 | |
1339 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1340 | shared_by: IIO_SHARED_BY_ALL, |
1341 | infomask: &chan->info_mask_shared_by_all_available); |
1342 | if (ret < 0) |
1343 | return ret; |
1344 | attrcount += ret; |
1345 | |
1346 | ret = iio_device_add_channel_label(indio_dev, chan); |
1347 | if (ret < 0) |
1348 | return ret; |
1349 | attrcount += ret; |
1350 | |
1351 | if (chan->ext_info) { |
1352 | unsigned int i = 0; |
1353 | |
1354 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { |
1355 | ret = __iio_add_chan_devattr(postfix: ext_info->name, |
1356 | chan, |
1357 | readfunc: ext_info->read ? |
1358 | &iio_read_channel_ext_info : NULL, |
1359 | writefunc: ext_info->write ? |
1360 | &iio_write_channel_ext_info : NULL, |
1361 | mask: i, |
1362 | shared_by: ext_info->shared, |
1363 | dev: &indio_dev->dev, |
1364 | NULL, |
1365 | attr_list: &iio_dev_opaque->channel_attr_list); |
1366 | i++; |
1367 | if (ret == -EBUSY && ext_info->shared) |
1368 | continue; |
1369 | |
1370 | if (ret) |
1371 | return ret; |
1372 | |
1373 | attrcount++; |
1374 | } |
1375 | } |
1376 | |
1377 | return attrcount; |
1378 | } |
1379 | |
1380 | /** |
1381 | * iio_free_chan_devattr_list() - Free a list of IIO device attributes |
1382 | * @attr_list: List of IIO device attributes |
1383 | * |
1384 | * This function frees the memory allocated for each of the IIO device |
1385 | * attributes in the list. |
1386 | */ |
1387 | void iio_free_chan_devattr_list(struct list_head *attr_list) |
1388 | { |
1389 | struct iio_dev_attr *p, *n; |
1390 | |
1391 | list_for_each_entry_safe(p, n, attr_list, l) { |
1392 | kfree_const(x: p->dev_attr.attr.name); |
1393 | list_del(entry: &p->l); |
1394 | kfree(objp: p); |
1395 | } |
1396 | } |
1397 | |
1398 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
1399 | char *buf) |
1400 | { |
1401 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1402 | |
1403 | return sysfs_emit(buf, fmt: "%s\n" , indio_dev->name); |
1404 | } |
1405 | |
1406 | static DEVICE_ATTR_RO(name); |
1407 | |
1408 | static ssize_t label_show(struct device *dev, struct device_attribute *attr, |
1409 | char *buf) |
1410 | { |
1411 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1412 | |
1413 | return sysfs_emit(buf, fmt: "%s\n" , indio_dev->label); |
1414 | } |
1415 | |
1416 | static DEVICE_ATTR_RO(label); |
1417 | |
1418 | static const char * const clock_names[] = { |
1419 | [CLOCK_REALTIME] = "realtime" , |
1420 | [CLOCK_MONOTONIC] = "monotonic" , |
1421 | [CLOCK_PROCESS_CPUTIME_ID] = "process_cputime_id" , |
1422 | [CLOCK_THREAD_CPUTIME_ID] = "thread_cputime_id" , |
1423 | [CLOCK_MONOTONIC_RAW] = "monotonic_raw" , |
1424 | [CLOCK_REALTIME_COARSE] = "realtime_coarse" , |
1425 | [CLOCK_MONOTONIC_COARSE] = "monotonic_coarse" , |
1426 | [CLOCK_BOOTTIME] = "boottime" , |
1427 | [CLOCK_REALTIME_ALARM] = "realtime_alarm" , |
1428 | [CLOCK_BOOTTIME_ALARM] = "boottime_alarm" , |
1429 | [CLOCK_SGI_CYCLE] = "sgi_cycle" , |
1430 | [CLOCK_TAI] = "tai" , |
1431 | }; |
1432 | |
1433 | static ssize_t current_timestamp_clock_show(struct device *dev, |
1434 | struct device_attribute *attr, |
1435 | char *buf) |
1436 | { |
1437 | const struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1438 | const clockid_t clk = iio_device_get_clock(indio_dev); |
1439 | |
1440 | switch (clk) { |
1441 | case CLOCK_REALTIME: |
1442 | case CLOCK_MONOTONIC: |
1443 | case CLOCK_MONOTONIC_RAW: |
1444 | case CLOCK_REALTIME_COARSE: |
1445 | case CLOCK_MONOTONIC_COARSE: |
1446 | case CLOCK_BOOTTIME: |
1447 | case CLOCK_TAI: |
1448 | break; |
1449 | default: |
1450 | BUG(); |
1451 | } |
1452 | |
1453 | return sysfs_emit(buf, fmt: "%s\n" , clock_names[clk]); |
1454 | } |
1455 | |
1456 | static ssize_t current_timestamp_clock_store(struct device *dev, |
1457 | struct device_attribute *attr, |
1458 | const char *buf, size_t len) |
1459 | { |
1460 | clockid_t clk; |
1461 | int ret; |
1462 | |
1463 | ret = sysfs_match_string(clock_names, buf); |
1464 | if (ret < 0) |
1465 | return ret; |
1466 | clk = ret; |
1467 | |
1468 | switch (clk) { |
1469 | case CLOCK_REALTIME: |
1470 | case CLOCK_MONOTONIC: |
1471 | case CLOCK_MONOTONIC_RAW: |
1472 | case CLOCK_REALTIME_COARSE: |
1473 | case CLOCK_MONOTONIC_COARSE: |
1474 | case CLOCK_BOOTTIME: |
1475 | case CLOCK_TAI: |
1476 | break; |
1477 | default: |
1478 | return -EINVAL; |
1479 | } |
1480 | |
1481 | ret = iio_device_set_clock(dev_to_iio_dev(dev), clk); |
1482 | if (ret) |
1483 | return ret; |
1484 | |
1485 | return len; |
1486 | } |
1487 | |
1488 | int iio_device_register_sysfs_group(struct iio_dev *indio_dev, |
1489 | const struct attribute_group *group) |
1490 | { |
1491 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1492 | const struct attribute_group **new, **old = iio_dev_opaque->groups; |
1493 | unsigned int cnt = iio_dev_opaque->groupcounter; |
1494 | |
1495 | new = krealloc_array(p: old, new_n: cnt + 2, new_size: sizeof(*new), GFP_KERNEL); |
1496 | if (!new) |
1497 | return -ENOMEM; |
1498 | |
1499 | new[iio_dev_opaque->groupcounter++] = group; |
1500 | new[iio_dev_opaque->groupcounter] = NULL; |
1501 | |
1502 | iio_dev_opaque->groups = new; |
1503 | |
1504 | return 0; |
1505 | } |
1506 | |
1507 | static DEVICE_ATTR_RW(current_timestamp_clock); |
1508 | |
1509 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1510 | { |
1511 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1512 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
1513 | struct iio_dev_attr *p; |
1514 | struct attribute **attr, *clk = NULL; |
1515 | |
1516 | /* First count elements in any existing group */ |
1517 | if (indio_dev->info->attrs) { |
1518 | attr = indio_dev->info->attrs->attrs; |
1519 | while (*attr++ != NULL) |
1520 | attrcount_orig++; |
1521 | } |
1522 | attrcount = attrcount_orig; |
1523 | /* |
1524 | * New channel registration method - relies on the fact a group does |
1525 | * not need to be initialized if its name is NULL. |
1526 | */ |
1527 | if (indio_dev->channels) |
1528 | for (i = 0; i < indio_dev->num_channels; i++) { |
1529 | const struct iio_chan_spec *chan = |
1530 | &indio_dev->channels[i]; |
1531 | |
1532 | if (chan->type == IIO_TIMESTAMP) |
1533 | clk = &dev_attr_current_timestamp_clock.attr; |
1534 | |
1535 | ret = iio_device_add_channel_sysfs(indio_dev, chan); |
1536 | if (ret < 0) |
1537 | goto error_clear_attrs; |
1538 | attrcount += ret; |
1539 | } |
1540 | |
1541 | if (iio_dev_opaque->event_interface) |
1542 | clk = &dev_attr_current_timestamp_clock.attr; |
1543 | |
1544 | if (indio_dev->name) |
1545 | attrcount++; |
1546 | if (indio_dev->label) |
1547 | attrcount++; |
1548 | if (clk) |
1549 | attrcount++; |
1550 | |
1551 | iio_dev_opaque->chan_attr_group.attrs = |
1552 | kcalloc(n: attrcount + 1, |
1553 | size: sizeof(iio_dev_opaque->chan_attr_group.attrs[0]), |
1554 | GFP_KERNEL); |
1555 | if (iio_dev_opaque->chan_attr_group.attrs == NULL) { |
1556 | ret = -ENOMEM; |
1557 | goto error_clear_attrs; |
1558 | } |
1559 | /* Copy across original attributes, and point to original binary attributes */ |
1560 | if (indio_dev->info->attrs) { |
1561 | memcpy(iio_dev_opaque->chan_attr_group.attrs, |
1562 | indio_dev->info->attrs->attrs, |
1563 | sizeof(iio_dev_opaque->chan_attr_group.attrs[0]) |
1564 | *attrcount_orig); |
1565 | iio_dev_opaque->chan_attr_group.is_visible = |
1566 | indio_dev->info->attrs->is_visible; |
1567 | iio_dev_opaque->chan_attr_group.bin_attrs = |
1568 | indio_dev->info->attrs->bin_attrs; |
1569 | } |
1570 | attrn = attrcount_orig; |
1571 | /* Add all elements from the list. */ |
1572 | list_for_each_entry(p, &iio_dev_opaque->channel_attr_list, l) |
1573 | iio_dev_opaque->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; |
1574 | if (indio_dev->name) |
1575 | iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; |
1576 | if (indio_dev->label) |
1577 | iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_label.attr; |
1578 | if (clk) |
1579 | iio_dev_opaque->chan_attr_group.attrs[attrn++] = clk; |
1580 | |
1581 | ret = iio_device_register_sysfs_group(indio_dev, |
1582 | group: &iio_dev_opaque->chan_attr_group); |
1583 | if (ret) |
1584 | goto error_clear_attrs; |
1585 | |
1586 | return 0; |
1587 | |
1588 | error_clear_attrs: |
1589 | iio_free_chan_devattr_list(attr_list: &iio_dev_opaque->channel_attr_list); |
1590 | |
1591 | return ret; |
1592 | } |
1593 | |
1594 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
1595 | { |
1596 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1597 | |
1598 | iio_free_chan_devattr_list(attr_list: &iio_dev_opaque->channel_attr_list); |
1599 | kfree(objp: iio_dev_opaque->chan_attr_group.attrs); |
1600 | iio_dev_opaque->chan_attr_group.attrs = NULL; |
1601 | kfree(objp: iio_dev_opaque->groups); |
1602 | iio_dev_opaque->groups = NULL; |
1603 | } |
1604 | |
1605 | static void iio_dev_release(struct device *device) |
1606 | { |
1607 | struct iio_dev *indio_dev = dev_to_iio_dev(dev: device); |
1608 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1609 | |
1610 | if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES) |
1611 | iio_device_unregister_trigger_consumer(indio_dev); |
1612 | iio_device_unregister_eventset(indio_dev); |
1613 | iio_device_unregister_sysfs(indio_dev); |
1614 | |
1615 | iio_device_detach_buffers(indio_dev); |
1616 | |
1617 | lockdep_unregister_key(key: &iio_dev_opaque->mlock_key); |
1618 | |
1619 | ida_free(&iio_ida, id: iio_dev_opaque->id); |
1620 | kfree(objp: iio_dev_opaque); |
1621 | } |
1622 | |
1623 | const struct device_type iio_device_type = { |
1624 | .name = "iio_device" , |
1625 | .release = iio_dev_release, |
1626 | }; |
1627 | |
1628 | /** |
1629 | * iio_device_alloc() - allocate an iio_dev from a driver |
1630 | * @parent: Parent device. |
1631 | * @sizeof_priv: Space to allocate for private structure. |
1632 | * |
1633 | * Returns: |
1634 | * Pointer to allocated iio_dev on success, NULL on failure. |
1635 | */ |
1636 | struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv) |
1637 | { |
1638 | struct iio_dev_opaque *iio_dev_opaque; |
1639 | struct iio_dev *indio_dev; |
1640 | size_t alloc_size; |
1641 | |
1642 | alloc_size = sizeof(struct iio_dev_opaque); |
1643 | if (sizeof_priv) { |
1644 | alloc_size = ALIGN(alloc_size, IIO_DMA_MINALIGN); |
1645 | alloc_size += sizeof_priv; |
1646 | } |
1647 | |
1648 | iio_dev_opaque = kzalloc(size: alloc_size, GFP_KERNEL); |
1649 | if (!iio_dev_opaque) |
1650 | return NULL; |
1651 | |
1652 | indio_dev = &iio_dev_opaque->indio_dev; |
1653 | indio_dev->priv = (char *)iio_dev_opaque + |
1654 | ALIGN(sizeof(struct iio_dev_opaque), IIO_DMA_MINALIGN); |
1655 | |
1656 | indio_dev->dev.parent = parent; |
1657 | indio_dev->dev.type = &iio_device_type; |
1658 | indio_dev->dev.bus = &iio_bus_type; |
1659 | device_initialize(dev: &indio_dev->dev); |
1660 | mutex_init(&iio_dev_opaque->mlock); |
1661 | mutex_init(&iio_dev_opaque->info_exist_lock); |
1662 | INIT_LIST_HEAD(list: &iio_dev_opaque->channel_attr_list); |
1663 | |
1664 | iio_dev_opaque->id = ida_alloc(ida: &iio_ida, GFP_KERNEL); |
1665 | if (iio_dev_opaque->id < 0) { |
1666 | /* cannot use a dev_err as the name isn't available */ |
1667 | pr_err("failed to get device id\n" ); |
1668 | kfree(objp: iio_dev_opaque); |
1669 | return NULL; |
1670 | } |
1671 | |
1672 | if (dev_set_name(dev: &indio_dev->dev, name: "iio:device%d" , iio_dev_opaque->id)) { |
1673 | ida_free(&iio_ida, id: iio_dev_opaque->id); |
1674 | kfree(objp: iio_dev_opaque); |
1675 | return NULL; |
1676 | } |
1677 | |
1678 | INIT_LIST_HEAD(list: &iio_dev_opaque->buffer_list); |
1679 | INIT_LIST_HEAD(list: &iio_dev_opaque->ioctl_handlers); |
1680 | |
1681 | lockdep_register_key(key: &iio_dev_opaque->mlock_key); |
1682 | lockdep_set_class(&iio_dev_opaque->mlock, &iio_dev_opaque->mlock_key); |
1683 | |
1684 | return indio_dev; |
1685 | } |
1686 | EXPORT_SYMBOL(iio_device_alloc); |
1687 | |
1688 | /** |
1689 | * iio_device_free() - free an iio_dev from a driver |
1690 | * @dev: the iio_dev associated with the device |
1691 | */ |
1692 | void iio_device_free(struct iio_dev *dev) |
1693 | { |
1694 | if (dev) |
1695 | put_device(dev: &dev->dev); |
1696 | } |
1697 | EXPORT_SYMBOL(iio_device_free); |
1698 | |
1699 | static void devm_iio_device_release(void *iio_dev) |
1700 | { |
1701 | iio_device_free(iio_dev); |
1702 | } |
1703 | |
1704 | /** |
1705 | * devm_iio_device_alloc - Resource-managed iio_device_alloc() |
1706 | * @parent: Device to allocate iio_dev for, and parent for this IIO device |
1707 | * @sizeof_priv: Space to allocate for private structure. |
1708 | * |
1709 | * Managed iio_device_alloc. iio_dev allocated with this function is |
1710 | * automatically freed on driver detach. |
1711 | * |
1712 | * Returns: |
1713 | * Pointer to allocated iio_dev on success, NULL on failure. |
1714 | */ |
1715 | struct iio_dev *devm_iio_device_alloc(struct device *parent, int sizeof_priv) |
1716 | { |
1717 | struct iio_dev *iio_dev; |
1718 | int ret; |
1719 | |
1720 | iio_dev = iio_device_alloc(parent, sizeof_priv); |
1721 | if (!iio_dev) |
1722 | return NULL; |
1723 | |
1724 | ret = devm_add_action_or_reset(parent, devm_iio_device_release, |
1725 | iio_dev); |
1726 | if (ret) |
1727 | return NULL; |
1728 | |
1729 | return iio_dev; |
1730 | } |
1731 | EXPORT_SYMBOL_GPL(devm_iio_device_alloc); |
1732 | |
1733 | /** |
1734 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
1735 | * @inode: Inode structure for identifying the device in the file system |
1736 | * @filp: File structure for iio device used to keep and later access |
1737 | * private data |
1738 | * |
1739 | * Returns: 0 on success or -EBUSY if the device is already opened |
1740 | */ |
1741 | static int iio_chrdev_open(struct inode *inode, struct file *filp) |
1742 | { |
1743 | struct iio_dev_opaque *iio_dev_opaque = |
1744 | container_of(inode->i_cdev, struct iio_dev_opaque, chrdev); |
1745 | struct iio_dev *indio_dev = &iio_dev_opaque->indio_dev; |
1746 | struct iio_dev_buffer_pair *ib; |
1747 | |
1748 | if (test_and_set_bit(IIO_BUSY_BIT_POS, addr: &iio_dev_opaque->flags)) |
1749 | return -EBUSY; |
1750 | |
1751 | iio_device_get(indio_dev); |
1752 | |
1753 | ib = kmalloc(size: sizeof(*ib), GFP_KERNEL); |
1754 | if (!ib) { |
1755 | iio_device_put(indio_dev); |
1756 | clear_bit(IIO_BUSY_BIT_POS, addr: &iio_dev_opaque->flags); |
1757 | return -ENOMEM; |
1758 | } |
1759 | |
1760 | ib->indio_dev = indio_dev; |
1761 | ib->buffer = indio_dev->buffer; |
1762 | |
1763 | filp->private_data = ib; |
1764 | |
1765 | return 0; |
1766 | } |
1767 | |
1768 | /** |
1769 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
1770 | * @inode: Inode structure pointer for the char device |
1771 | * @filp: File structure pointer for the char device |
1772 | * |
1773 | * Returns: 0 for successful release. |
1774 | */ |
1775 | static int iio_chrdev_release(struct inode *inode, struct file *filp) |
1776 | { |
1777 | struct iio_dev_buffer_pair *ib = filp->private_data; |
1778 | struct iio_dev_opaque *iio_dev_opaque = |
1779 | container_of(inode->i_cdev, struct iio_dev_opaque, chrdev); |
1780 | struct iio_dev *indio_dev = &iio_dev_opaque->indio_dev; |
1781 | |
1782 | kfree(objp: ib); |
1783 | clear_bit(IIO_BUSY_BIT_POS, addr: &iio_dev_opaque->flags); |
1784 | iio_device_put(indio_dev); |
1785 | |
1786 | return 0; |
1787 | } |
1788 | |
1789 | void iio_device_ioctl_handler_register(struct iio_dev *indio_dev, |
1790 | struct iio_ioctl_handler *h) |
1791 | { |
1792 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1793 | |
1794 | list_add_tail(new: &h->entry, head: &iio_dev_opaque->ioctl_handlers); |
1795 | } |
1796 | |
1797 | void iio_device_ioctl_handler_unregister(struct iio_ioctl_handler *h) |
1798 | { |
1799 | list_del(entry: &h->entry); |
1800 | } |
1801 | |
1802 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1803 | { |
1804 | struct iio_dev_buffer_pair *ib = filp->private_data; |
1805 | struct iio_dev *indio_dev = ib->indio_dev; |
1806 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1807 | struct iio_ioctl_handler *h; |
1808 | int ret = -ENODEV; |
1809 | |
1810 | mutex_lock(&iio_dev_opaque->info_exist_lock); |
1811 | |
1812 | /* |
1813 | * The NULL check here is required to prevent crashing when a device |
1814 | * is being removed while userspace would still have open file handles |
1815 | * to try to access this device. |
1816 | */ |
1817 | if (!indio_dev->info) |
1818 | goto out_unlock; |
1819 | |
1820 | list_for_each_entry(h, &iio_dev_opaque->ioctl_handlers, entry) { |
1821 | ret = h->ioctl(indio_dev, filp, cmd, arg); |
1822 | if (ret != IIO_IOCTL_UNHANDLED) |
1823 | break; |
1824 | } |
1825 | |
1826 | if (ret == IIO_IOCTL_UNHANDLED) |
1827 | ret = -ENODEV; |
1828 | |
1829 | out_unlock: |
1830 | mutex_unlock(lock: &iio_dev_opaque->info_exist_lock); |
1831 | |
1832 | return ret; |
1833 | } |
1834 | |
1835 | static const struct file_operations iio_buffer_fileops = { |
1836 | .owner = THIS_MODULE, |
1837 | .llseek = noop_llseek, |
1838 | .read = iio_buffer_read_outer_addr, |
1839 | .write = iio_buffer_write_outer_addr, |
1840 | .poll = iio_buffer_poll_addr, |
1841 | .unlocked_ioctl = iio_ioctl, |
1842 | .compat_ioctl = compat_ptr_ioctl, |
1843 | .open = iio_chrdev_open, |
1844 | .release = iio_chrdev_release, |
1845 | }; |
1846 | |
1847 | static const struct file_operations iio_event_fileops = { |
1848 | .owner = THIS_MODULE, |
1849 | .llseek = noop_llseek, |
1850 | .unlocked_ioctl = iio_ioctl, |
1851 | .compat_ioctl = compat_ptr_ioctl, |
1852 | .open = iio_chrdev_open, |
1853 | .release = iio_chrdev_release, |
1854 | }; |
1855 | |
1856 | static int iio_check_unique_scan_index(struct iio_dev *indio_dev) |
1857 | { |
1858 | int i, j; |
1859 | const struct iio_chan_spec *channels = indio_dev->channels; |
1860 | |
1861 | if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES)) |
1862 | return 0; |
1863 | |
1864 | for (i = 0; i < indio_dev->num_channels - 1; i++) { |
1865 | if (channels[i].scan_index < 0) |
1866 | continue; |
1867 | for (j = i + 1; j < indio_dev->num_channels; j++) |
1868 | if (channels[i].scan_index == channels[j].scan_index) { |
1869 | dev_err(&indio_dev->dev, |
1870 | "Duplicate scan index %d\n" , |
1871 | channels[i].scan_index); |
1872 | return -EINVAL; |
1873 | } |
1874 | } |
1875 | |
1876 | return 0; |
1877 | } |
1878 | |
1879 | static int iio_check_extended_name(const struct iio_dev *indio_dev) |
1880 | { |
1881 | unsigned int i; |
1882 | |
1883 | if (!indio_dev->info->read_label) |
1884 | return 0; |
1885 | |
1886 | for (i = 0; i < indio_dev->num_channels; i++) { |
1887 | if (indio_dev->channels[i].extend_name) { |
1888 | dev_err(&indio_dev->dev, |
1889 | "Cannot use labels and extend_name at the same time\n" ); |
1890 | return -EINVAL; |
1891 | } |
1892 | } |
1893 | |
1894 | return 0; |
1895 | } |
1896 | |
1897 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
1898 | |
1899 | int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod) |
1900 | { |
1901 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1902 | struct fwnode_handle *fwnode = NULL; |
1903 | int ret; |
1904 | |
1905 | if (!indio_dev->info) |
1906 | return -EINVAL; |
1907 | |
1908 | iio_dev_opaque->driver_module = this_mod; |
1909 | |
1910 | /* If the calling driver did not initialize firmware node, do it here */ |
1911 | if (dev_fwnode(&indio_dev->dev)) |
1912 | fwnode = dev_fwnode(&indio_dev->dev); |
1913 | /* The default dummy IIO device has no parent */ |
1914 | else if (indio_dev->dev.parent) |
1915 | fwnode = dev_fwnode(indio_dev->dev.parent); |
1916 | device_set_node(dev: &indio_dev->dev, fwnode); |
1917 | |
1918 | fwnode_property_read_string(fwnode, propname: "label" , val: &indio_dev->label); |
1919 | |
1920 | ret = iio_check_unique_scan_index(indio_dev); |
1921 | if (ret < 0) |
1922 | return ret; |
1923 | |
1924 | ret = iio_check_extended_name(indio_dev); |
1925 | if (ret < 0) |
1926 | return ret; |
1927 | |
1928 | iio_device_register_debugfs(indio_dev); |
1929 | |
1930 | ret = iio_buffers_alloc_sysfs_and_mask(indio_dev); |
1931 | if (ret) { |
1932 | dev_err(indio_dev->dev.parent, |
1933 | "Failed to create buffer sysfs interfaces\n" ); |
1934 | goto error_unreg_debugfs; |
1935 | } |
1936 | |
1937 | ret = iio_device_register_sysfs(indio_dev); |
1938 | if (ret) { |
1939 | dev_err(indio_dev->dev.parent, |
1940 | "Failed to register sysfs interfaces\n" ); |
1941 | goto error_buffer_free_sysfs; |
1942 | } |
1943 | ret = iio_device_register_eventset(indio_dev); |
1944 | if (ret) { |
1945 | dev_err(indio_dev->dev.parent, |
1946 | "Failed to register event set\n" ); |
1947 | goto error_free_sysfs; |
1948 | } |
1949 | if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES) |
1950 | iio_device_register_trigger_consumer(indio_dev); |
1951 | |
1952 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
1953 | indio_dev->setup_ops == NULL) |
1954 | indio_dev->setup_ops = &noop_ring_setup_ops; |
1955 | |
1956 | if (iio_dev_opaque->attached_buffers_cnt) |
1957 | cdev_init(&iio_dev_opaque->chrdev, &iio_buffer_fileops); |
1958 | else if (iio_dev_opaque->event_interface) |
1959 | cdev_init(&iio_dev_opaque->chrdev, &iio_event_fileops); |
1960 | |
1961 | if (iio_dev_opaque->attached_buffers_cnt || iio_dev_opaque->event_interface) { |
1962 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), iio_dev_opaque->id); |
1963 | iio_dev_opaque->chrdev.owner = this_mod; |
1964 | } |
1965 | |
1966 | /* assign device groups now; they should be all registered now */ |
1967 | indio_dev->dev.groups = iio_dev_opaque->groups; |
1968 | |
1969 | ret = cdev_device_add(cdev: &iio_dev_opaque->chrdev, dev: &indio_dev->dev); |
1970 | if (ret < 0) |
1971 | goto error_unreg_eventset; |
1972 | |
1973 | return 0; |
1974 | |
1975 | error_unreg_eventset: |
1976 | iio_device_unregister_eventset(indio_dev); |
1977 | error_free_sysfs: |
1978 | iio_device_unregister_sysfs(indio_dev); |
1979 | error_buffer_free_sysfs: |
1980 | iio_buffers_free_sysfs_and_mask(indio_dev); |
1981 | error_unreg_debugfs: |
1982 | iio_device_unregister_debugfs(indio_dev); |
1983 | return ret; |
1984 | } |
1985 | EXPORT_SYMBOL(__iio_device_register); |
1986 | |
1987 | /** |
1988 | * iio_device_unregister() - unregister a device from the IIO subsystem |
1989 | * @indio_dev: Device structure representing the device. |
1990 | */ |
1991 | void iio_device_unregister(struct iio_dev *indio_dev) |
1992 | { |
1993 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1994 | |
1995 | cdev_device_del(cdev: &iio_dev_opaque->chrdev, dev: &indio_dev->dev); |
1996 | |
1997 | mutex_lock(&iio_dev_opaque->info_exist_lock); |
1998 | |
1999 | iio_device_unregister_debugfs(indio_dev); |
2000 | |
2001 | iio_disable_all_buffers(indio_dev); |
2002 | |
2003 | indio_dev->info = NULL; |
2004 | |
2005 | iio_device_wakeup_eventset(indio_dev); |
2006 | iio_buffer_wakeup_poll(indio_dev); |
2007 | |
2008 | mutex_unlock(lock: &iio_dev_opaque->info_exist_lock); |
2009 | |
2010 | iio_buffers_free_sysfs_and_mask(indio_dev); |
2011 | } |
2012 | EXPORT_SYMBOL(iio_device_unregister); |
2013 | |
2014 | static void devm_iio_device_unreg(void *indio_dev) |
2015 | { |
2016 | iio_device_unregister(indio_dev); |
2017 | } |
2018 | |
2019 | int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev, |
2020 | struct module *this_mod) |
2021 | { |
2022 | int ret; |
2023 | |
2024 | ret = __iio_device_register(indio_dev, this_mod); |
2025 | if (ret) |
2026 | return ret; |
2027 | |
2028 | return devm_add_action_or_reset(dev, devm_iio_device_unreg, indio_dev); |
2029 | } |
2030 | EXPORT_SYMBOL_GPL(__devm_iio_device_register); |
2031 | |
2032 | /** |
2033 | * iio_device_claim_direct_mode - Keep device in direct mode |
2034 | * @indio_dev: the iio_dev associated with the device |
2035 | * |
2036 | * If the device is in direct mode it is guaranteed to stay |
2037 | * that way until iio_device_release_direct_mode() is called. |
2038 | * |
2039 | * Use with iio_device_release_direct_mode() |
2040 | * |
2041 | * Returns: 0 on success, -EBUSY on failure. |
2042 | */ |
2043 | int iio_device_claim_direct_mode(struct iio_dev *indio_dev) |
2044 | { |
2045 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
2046 | |
2047 | mutex_lock(&iio_dev_opaque->mlock); |
2048 | |
2049 | if (iio_buffer_enabled(indio_dev)) { |
2050 | mutex_unlock(lock: &iio_dev_opaque->mlock); |
2051 | return -EBUSY; |
2052 | } |
2053 | return 0; |
2054 | } |
2055 | EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode); |
2056 | |
2057 | /** |
2058 | * iio_device_release_direct_mode - releases claim on direct mode |
2059 | * @indio_dev: the iio_dev associated with the device |
2060 | * |
2061 | * Release the claim. Device is no longer guaranteed to stay |
2062 | * in direct mode. |
2063 | * |
2064 | * Use with iio_device_claim_direct_mode() |
2065 | */ |
2066 | void iio_device_release_direct_mode(struct iio_dev *indio_dev) |
2067 | { |
2068 | mutex_unlock(lock: &to_iio_dev_opaque(indio_dev)->mlock); |
2069 | } |
2070 | EXPORT_SYMBOL_GPL(iio_device_release_direct_mode); |
2071 | |
2072 | /** |
2073 | * iio_device_claim_buffer_mode - Keep device in buffer mode |
2074 | * @indio_dev: the iio_dev associated with the device |
2075 | * |
2076 | * If the device is in buffer mode it is guaranteed to stay |
2077 | * that way until iio_device_release_buffer_mode() is called. |
2078 | * |
2079 | * Use with iio_device_release_buffer_mode(). |
2080 | * |
2081 | * Returns: 0 on success, -EBUSY on failure. |
2082 | */ |
2083 | int iio_device_claim_buffer_mode(struct iio_dev *indio_dev) |
2084 | { |
2085 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
2086 | |
2087 | mutex_lock(&iio_dev_opaque->mlock); |
2088 | |
2089 | if (iio_buffer_enabled(indio_dev)) |
2090 | return 0; |
2091 | |
2092 | mutex_unlock(lock: &iio_dev_opaque->mlock); |
2093 | return -EBUSY; |
2094 | } |
2095 | EXPORT_SYMBOL_GPL(iio_device_claim_buffer_mode); |
2096 | |
2097 | /** |
2098 | * iio_device_release_buffer_mode - releases claim on buffer mode |
2099 | * @indio_dev: the iio_dev associated with the device |
2100 | * |
2101 | * Release the claim. Device is no longer guaranteed to stay |
2102 | * in buffer mode. |
2103 | * |
2104 | * Use with iio_device_claim_buffer_mode(). |
2105 | */ |
2106 | void iio_device_release_buffer_mode(struct iio_dev *indio_dev) |
2107 | { |
2108 | mutex_unlock(lock: &to_iio_dev_opaque(indio_dev)->mlock); |
2109 | } |
2110 | EXPORT_SYMBOL_GPL(iio_device_release_buffer_mode); |
2111 | |
2112 | /** |
2113 | * iio_device_get_current_mode() - helper function providing read-only access to |
2114 | * the opaque @currentmode variable |
2115 | * @indio_dev: IIO device structure for device |
2116 | */ |
2117 | int iio_device_get_current_mode(struct iio_dev *indio_dev) |
2118 | { |
2119 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
2120 | |
2121 | return iio_dev_opaque->currentmode; |
2122 | } |
2123 | EXPORT_SYMBOL_GPL(iio_device_get_current_mode); |
2124 | |
2125 | subsys_initcall(iio_init); |
2126 | module_exit(iio_exit); |
2127 | |
2128 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>" ); |
2129 | MODULE_DESCRIPTION("Industrial I/O core" ); |
2130 | MODULE_LICENSE("GPL" ); |
2131 | |