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 | const 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_UVA] = "uva" , |
121 | [IIO_MOD_LIGHT_UVB] = "uvb" , |
122 | [IIO_MOD_LIGHT_DUV] = "duv" , |
123 | [IIO_MOD_QUATERNION] = "quaternion" , |
124 | [IIO_MOD_TEMP_AMBIENT] = "ambient" , |
125 | [IIO_MOD_TEMP_OBJECT] = "object" , |
126 | [IIO_MOD_NORTH_MAGN] = "from_north_magnetic" , |
127 | [IIO_MOD_NORTH_TRUE] = "from_north_true" , |
128 | [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp" , |
129 | [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp" , |
130 | [IIO_MOD_RUNNING] = "running" , |
131 | [IIO_MOD_JOGGING] = "jogging" , |
132 | [IIO_MOD_WALKING] = "walking" , |
133 | [IIO_MOD_STILL] = "still" , |
134 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)" , |
135 | [IIO_MOD_I] = "i" , |
136 | [IIO_MOD_Q] = "q" , |
137 | [IIO_MOD_CO2] = "co2" , |
138 | [IIO_MOD_VOC] = "voc" , |
139 | [IIO_MOD_PM1] = "pm1" , |
140 | [IIO_MOD_PM2P5] = "pm2p5" , |
141 | [IIO_MOD_PM4] = "pm4" , |
142 | [IIO_MOD_PM10] = "pm10" , |
143 | [IIO_MOD_ETHANOL] = "ethanol" , |
144 | [IIO_MOD_H2] = "h2" , |
145 | [IIO_MOD_O2] = "o2" , |
146 | [IIO_MOD_LINEAR_X] = "linear_x" , |
147 | [IIO_MOD_LINEAR_Y] = "linear_y" , |
148 | [IIO_MOD_LINEAR_Z] = "linear_z" , |
149 | [IIO_MOD_PITCH] = "pitch" , |
150 | [IIO_MOD_YAW] = "yaw" , |
151 | [IIO_MOD_ROLL] = "roll" , |
152 | }; |
153 | |
154 | /* relies on pairs of these shared then separate */ |
155 | static const char * const iio_chan_info_postfix[] = { |
156 | [IIO_CHAN_INFO_RAW] = "raw" , |
157 | [IIO_CHAN_INFO_PROCESSED] = "input" , |
158 | [IIO_CHAN_INFO_SCALE] = "scale" , |
159 | [IIO_CHAN_INFO_OFFSET] = "offset" , |
160 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale" , |
161 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias" , |
162 | [IIO_CHAN_INFO_PEAK] = "peak_raw" , |
163 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale" , |
164 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw" , |
165 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw" , |
166 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
167 | = "filter_low_pass_3db_frequency" , |
168 | [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY] |
169 | = "filter_high_pass_3db_frequency" , |
170 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency" , |
171 | [IIO_CHAN_INFO_FREQUENCY] = "frequency" , |
172 | [IIO_CHAN_INFO_PHASE] = "phase" , |
173 | [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain" , |
174 | [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis" , |
175 | [IIO_CHAN_INFO_HYSTERESIS_RELATIVE] = "hysteresis_relative" , |
176 | [IIO_CHAN_INFO_INT_TIME] = "integration_time" , |
177 | [IIO_CHAN_INFO_ENABLE] = "en" , |
178 | [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight" , |
179 | [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight" , |
180 | [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count" , |
181 | [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time" , |
182 | [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity" , |
183 | [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio" , |
184 | [IIO_CHAN_INFO_THERMOCOUPLE_TYPE] = "thermocouple_type" , |
185 | [IIO_CHAN_INFO_CALIBAMBIENT] = "calibambient" , |
186 | [IIO_CHAN_INFO_ZEROPOINT] = "zeropoint" , |
187 | [IIO_CHAN_INFO_TROUGH] = "trough_raw" , |
188 | }; |
189 | /** |
190 | * iio_device_id() - query the unique ID for the device |
191 | * @indio_dev: Device structure whose ID is being queried |
192 | * |
193 | * The IIO device ID is a unique index used for example for the naming |
194 | * of the character device /dev/iio\:device[ID]. |
195 | * |
196 | * Returns: Unique ID for the device. |
197 | */ |
198 | int iio_device_id(struct iio_dev *indio_dev) |
199 | { |
200 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
201 | |
202 | return iio_dev_opaque->id; |
203 | } |
204 | EXPORT_SYMBOL_GPL(iio_device_id); |
205 | |
206 | /** |
207 | * iio_buffer_enabled() - helper function to test if the buffer is enabled |
208 | * @indio_dev: IIO device structure for device |
209 | * |
210 | * Returns: True, if the buffer is enabled. |
211 | */ |
212 | bool iio_buffer_enabled(struct iio_dev *indio_dev) |
213 | { |
214 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
215 | |
216 | return iio_dev_opaque->currentmode & INDIO_ALL_BUFFER_MODES; |
217 | } |
218 | EXPORT_SYMBOL_GPL(iio_buffer_enabled); |
219 | |
220 | #if defined(CONFIG_DEBUG_FS) |
221 | /* |
222 | * There's also a CONFIG_DEBUG_FS guard in include/linux/iio/iio.h for |
223 | * iio_get_debugfs_dentry() to make it inline if CONFIG_DEBUG_FS is undefined |
224 | */ |
225 | struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev) |
226 | { |
227 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
228 | |
229 | return iio_dev_opaque->debugfs_dentry; |
230 | } |
231 | EXPORT_SYMBOL_GPL(iio_get_debugfs_dentry); |
232 | #endif |
233 | |
234 | /** |
235 | * iio_find_channel_from_si() - get channel from its scan index |
236 | * @indio_dev: device |
237 | * @si: scan index to match |
238 | * |
239 | * Returns: |
240 | * Constant pointer to iio_chan_spec, if scan index matches, NULL on failure. |
241 | */ |
242 | const struct iio_chan_spec |
243 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) |
244 | { |
245 | int i; |
246 | |
247 | for (i = 0; i < indio_dev->num_channels; i++) |
248 | if (indio_dev->channels[i].scan_index == si) |
249 | return &indio_dev->channels[i]; |
250 | return NULL; |
251 | } |
252 | |
253 | /* This turns up an awful lot */ |
254 | ssize_t iio_read_const_attr(struct device *dev, |
255 | struct device_attribute *attr, |
256 | char *buf) |
257 | { |
258 | return sysfs_emit(buf, fmt: "%s\n" , to_iio_const_attr(attr)->string); |
259 | } |
260 | EXPORT_SYMBOL(iio_read_const_attr); |
261 | |
262 | /** |
263 | * iio_device_set_clock() - Set current timestamping clock for the device |
264 | * @indio_dev: IIO device structure containing the device |
265 | * @clock_id: timestamping clock POSIX identifier to set. |
266 | * |
267 | * Returns: 0 on success, or a negative error code. |
268 | */ |
269 | int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id) |
270 | { |
271 | int ret; |
272 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
273 | const struct iio_event_interface *ev_int = iio_dev_opaque->event_interface; |
274 | |
275 | ret = mutex_lock_interruptible(&iio_dev_opaque->mlock); |
276 | if (ret) |
277 | return ret; |
278 | if ((ev_int && iio_event_enabled(ev_int)) || |
279 | iio_buffer_enabled(indio_dev)) { |
280 | mutex_unlock(lock: &iio_dev_opaque->mlock); |
281 | return -EBUSY; |
282 | } |
283 | iio_dev_opaque->clock_id = clock_id; |
284 | mutex_unlock(lock: &iio_dev_opaque->mlock); |
285 | |
286 | return 0; |
287 | } |
288 | EXPORT_SYMBOL(iio_device_set_clock); |
289 | |
290 | /** |
291 | * iio_device_get_clock() - Retrieve current timestamping clock for the device |
292 | * @indio_dev: IIO device structure containing the device |
293 | * |
294 | * Returns: Clock ID of the current timestamping clock for the device. |
295 | */ |
296 | clockid_t iio_device_get_clock(const struct iio_dev *indio_dev) |
297 | { |
298 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
299 | |
300 | return iio_dev_opaque->clock_id; |
301 | } |
302 | EXPORT_SYMBOL(iio_device_get_clock); |
303 | |
304 | /** |
305 | * iio_get_time_ns() - utility function to get a time stamp for events etc |
306 | * @indio_dev: device |
307 | * |
308 | * Returns: Timestamp of the event in nanoseconds. |
309 | */ |
310 | s64 iio_get_time_ns(const struct iio_dev *indio_dev) |
311 | { |
312 | struct timespec64 tp; |
313 | |
314 | switch (iio_device_get_clock(indio_dev)) { |
315 | case CLOCK_REALTIME: |
316 | return ktime_get_real_ns(); |
317 | case CLOCK_MONOTONIC: |
318 | return ktime_get_ns(); |
319 | case CLOCK_MONOTONIC_RAW: |
320 | return ktime_get_raw_ns(); |
321 | case CLOCK_REALTIME_COARSE: |
322 | return ktime_to_ns(kt: ktime_get_coarse_real()); |
323 | case CLOCK_MONOTONIC_COARSE: |
324 | ktime_get_coarse_ts64(ts: &tp); |
325 | return timespec64_to_ns(ts: &tp); |
326 | case CLOCK_BOOTTIME: |
327 | return ktime_get_boottime_ns(); |
328 | case CLOCK_TAI: |
329 | return ktime_get_clocktai_ns(); |
330 | default: |
331 | BUG(); |
332 | } |
333 | } |
334 | EXPORT_SYMBOL(iio_get_time_ns); |
335 | |
336 | static int __init iio_init(void) |
337 | { |
338 | int ret; |
339 | |
340 | /* Register sysfs bus */ |
341 | ret = bus_register(bus: &iio_bus_type); |
342 | if (ret < 0) { |
343 | pr_err("could not register bus type\n" ); |
344 | goto error_nothing; |
345 | } |
346 | |
347 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio" ); |
348 | if (ret < 0) { |
349 | pr_err("failed to allocate char dev region\n" ); |
350 | goto error_unregister_bus_type; |
351 | } |
352 | |
353 | iio_debugfs_dentry = debugfs_create_dir(name: "iio" , NULL); |
354 | |
355 | return 0; |
356 | |
357 | error_unregister_bus_type: |
358 | bus_unregister(bus: &iio_bus_type); |
359 | error_nothing: |
360 | return ret; |
361 | } |
362 | |
363 | static void __exit iio_exit(void) |
364 | { |
365 | if (iio_devt) |
366 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); |
367 | bus_unregister(bus: &iio_bus_type); |
368 | debugfs_remove(dentry: iio_debugfs_dentry); |
369 | } |
370 | |
371 | #if defined(CONFIG_DEBUG_FS) |
372 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
373 | size_t count, loff_t *ppos) |
374 | { |
375 | struct iio_dev *indio_dev = file->private_data; |
376 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
377 | unsigned int val = 0; |
378 | int ret; |
379 | |
380 | if (*ppos > 0) |
381 | return simple_read_from_buffer(to: userbuf, count, ppos, |
382 | from: iio_dev_opaque->read_buf, |
383 | available: iio_dev_opaque->read_buf_len); |
384 | |
385 | ret = indio_dev->info->debugfs_reg_access(indio_dev, |
386 | iio_dev_opaque->cached_reg_addr, |
387 | 0, &val); |
388 | if (ret) { |
389 | dev_err(indio_dev->dev.parent, "%s: read failed\n" , __func__); |
390 | return ret; |
391 | } |
392 | |
393 | iio_dev_opaque->read_buf_len = snprintf(buf: iio_dev_opaque->read_buf, |
394 | size: sizeof(iio_dev_opaque->read_buf), |
395 | fmt: "0x%X\n" , val); |
396 | |
397 | return simple_read_from_buffer(to: userbuf, count, ppos, |
398 | from: iio_dev_opaque->read_buf, |
399 | available: iio_dev_opaque->read_buf_len); |
400 | } |
401 | |
402 | static ssize_t iio_debugfs_write_reg(struct file *file, |
403 | const char __user *userbuf, size_t count, loff_t *ppos) |
404 | { |
405 | struct iio_dev *indio_dev = file->private_data; |
406 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
407 | unsigned int reg, val; |
408 | char buf[80]; |
409 | int ret; |
410 | |
411 | count = min(count, sizeof(buf) - 1); |
412 | if (copy_from_user(to: buf, from: userbuf, n: count)) |
413 | return -EFAULT; |
414 | |
415 | buf[count] = 0; |
416 | |
417 | ret = sscanf(buf, "%i %i" , ®, &val); |
418 | |
419 | switch (ret) { |
420 | case 1: |
421 | iio_dev_opaque->cached_reg_addr = reg; |
422 | break; |
423 | case 2: |
424 | iio_dev_opaque->cached_reg_addr = reg; |
425 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, |
426 | val, NULL); |
427 | if (ret) { |
428 | dev_err(indio_dev->dev.parent, "%s: write failed\n" , |
429 | __func__); |
430 | return ret; |
431 | } |
432 | break; |
433 | default: |
434 | return -EINVAL; |
435 | } |
436 | |
437 | return count; |
438 | } |
439 | |
440 | static const struct file_operations iio_debugfs_reg_fops = { |
441 | .open = simple_open, |
442 | .read = iio_debugfs_read_reg, |
443 | .write = iio_debugfs_write_reg, |
444 | }; |
445 | |
446 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) |
447 | { |
448 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
449 | |
450 | debugfs_remove_recursive(dentry: iio_dev_opaque->debugfs_dentry); |
451 | } |
452 | |
453 | static void iio_device_register_debugfs(struct iio_dev *indio_dev) |
454 | { |
455 | struct iio_dev_opaque *iio_dev_opaque; |
456 | |
457 | if (indio_dev->info->debugfs_reg_access == NULL) |
458 | return; |
459 | |
460 | if (!iio_debugfs_dentry) |
461 | return; |
462 | |
463 | iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
464 | |
465 | iio_dev_opaque->debugfs_dentry = |
466 | debugfs_create_dir(name: dev_name(dev: &indio_dev->dev), |
467 | parent: iio_debugfs_dentry); |
468 | |
469 | debugfs_create_file(name: "direct_reg_access" , mode: 0644, |
470 | parent: iio_dev_opaque->debugfs_dentry, data: indio_dev, |
471 | fops: &iio_debugfs_reg_fops); |
472 | } |
473 | #else |
474 | static void iio_device_register_debugfs(struct iio_dev *indio_dev) |
475 | { |
476 | } |
477 | |
478 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) |
479 | { |
480 | } |
481 | #endif /* CONFIG_DEBUG_FS */ |
482 | |
483 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
484 | struct device_attribute *attr, |
485 | char *buf) |
486 | { |
487 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
488 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
489 | const struct iio_chan_spec_ext_info *ext_info; |
490 | |
491 | ext_info = &this_attr->c->ext_info[this_attr->address]; |
492 | |
493 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
494 | } |
495 | |
496 | static ssize_t iio_write_channel_ext_info(struct device *dev, |
497 | struct device_attribute *attr, |
498 | const char *buf, size_t len) |
499 | { |
500 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
501 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
502 | const struct iio_chan_spec_ext_info *ext_info; |
503 | |
504 | ext_info = &this_attr->c->ext_info[this_attr->address]; |
505 | |
506 | return ext_info->write(indio_dev, ext_info->private, |
507 | this_attr->c, buf, len); |
508 | } |
509 | |
510 | ssize_t iio_enum_available_read(struct iio_dev *indio_dev, |
511 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) |
512 | { |
513 | const struct iio_enum *e = (const struct iio_enum *)priv; |
514 | unsigned int i; |
515 | size_t len = 0; |
516 | |
517 | if (!e->num_items) |
518 | return 0; |
519 | |
520 | for (i = 0; i < e->num_items; ++i) { |
521 | if (!e->items[i]) |
522 | continue; |
523 | len += sysfs_emit_at(buf, at: len, fmt: "%s " , e->items[i]); |
524 | } |
525 | |
526 | /* replace last space with a newline */ |
527 | buf[len - 1] = '\n'; |
528 | |
529 | return len; |
530 | } |
531 | EXPORT_SYMBOL_GPL(iio_enum_available_read); |
532 | |
533 | ssize_t iio_enum_read(struct iio_dev *indio_dev, |
534 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) |
535 | { |
536 | const struct iio_enum *e = (const struct iio_enum *)priv; |
537 | int i; |
538 | |
539 | if (!e->get) |
540 | return -EINVAL; |
541 | |
542 | i = e->get(indio_dev, chan); |
543 | if (i < 0) |
544 | return i; |
545 | if (i >= e->num_items || !e->items[i]) |
546 | return -EINVAL; |
547 | |
548 | return sysfs_emit(buf, fmt: "%s\n" , e->items[i]); |
549 | } |
550 | EXPORT_SYMBOL_GPL(iio_enum_read); |
551 | |
552 | ssize_t iio_enum_write(struct iio_dev *indio_dev, |
553 | uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, |
554 | size_t len) |
555 | { |
556 | const struct iio_enum *e = (const struct iio_enum *)priv; |
557 | int ret; |
558 | |
559 | if (!e->set) |
560 | return -EINVAL; |
561 | |
562 | ret = __sysfs_match_string(array: e->items, n: e->num_items, s: buf); |
563 | if (ret < 0) |
564 | return ret; |
565 | |
566 | ret = e->set(indio_dev, chan, ret); |
567 | return ret ? ret : len; |
568 | } |
569 | EXPORT_SYMBOL_GPL(iio_enum_write); |
570 | |
571 | static const struct iio_mount_matrix iio_mount_idmatrix = { |
572 | .rotation = { |
573 | "1" , "0" , "0" , |
574 | "0" , "1" , "0" , |
575 | "0" , "0" , "1" |
576 | } |
577 | }; |
578 | |
579 | static int iio_setup_mount_idmatrix(const struct device *dev, |
580 | struct iio_mount_matrix *matrix) |
581 | { |
582 | *matrix = iio_mount_idmatrix; |
583 | dev_info(dev, "mounting matrix not found: using identity...\n" ); |
584 | return 0; |
585 | } |
586 | |
587 | ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv, |
588 | const struct iio_chan_spec *chan, char *buf) |
589 | { |
590 | const struct iio_mount_matrix *mtx; |
591 | |
592 | mtx = ((iio_get_mount_matrix_t *)priv)(indio_dev, chan); |
593 | if (IS_ERR(ptr: mtx)) |
594 | return PTR_ERR(ptr: mtx); |
595 | |
596 | if (!mtx) |
597 | mtx = &iio_mount_idmatrix; |
598 | |
599 | return sysfs_emit(buf, fmt: "%s, %s, %s; %s, %s, %s; %s, %s, %s\n" , |
600 | mtx->rotation[0], mtx->rotation[1], mtx->rotation[2], |
601 | mtx->rotation[3], mtx->rotation[4], mtx->rotation[5], |
602 | mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]); |
603 | } |
604 | EXPORT_SYMBOL_GPL(iio_show_mount_matrix); |
605 | |
606 | /** |
607 | * iio_read_mount_matrix() - retrieve iio device mounting matrix from |
608 | * device "mount-matrix" property |
609 | * @dev: device the mounting matrix property is assigned to |
610 | * @matrix: where to store retrieved matrix |
611 | * |
612 | * If device is assigned no mounting matrix property, a default 3x3 identity |
613 | * matrix will be filled in. |
614 | * |
615 | * Returns: 0 if success, or a negative error code on failure. |
616 | */ |
617 | int iio_read_mount_matrix(struct device *dev, struct iio_mount_matrix *matrix) |
618 | { |
619 | size_t len = ARRAY_SIZE(iio_mount_idmatrix.rotation); |
620 | int err; |
621 | |
622 | err = device_property_read_string_array(dev, propname: "mount-matrix" , val: matrix->rotation, nval: len); |
623 | if (err == len) |
624 | return 0; |
625 | |
626 | if (err >= 0) |
627 | /* Invalid number of matrix entries. */ |
628 | return -EINVAL; |
629 | |
630 | if (err != -EINVAL) |
631 | /* Invalid matrix declaration format. */ |
632 | return err; |
633 | |
634 | /* Matrix was not declared at all: fallback to identity. */ |
635 | return iio_setup_mount_idmatrix(dev, matrix); |
636 | } |
637 | EXPORT_SYMBOL(iio_read_mount_matrix); |
638 | |
639 | static ssize_t __iio_format_value(char *buf, size_t offset, unsigned int type, |
640 | int size, const int *vals) |
641 | { |
642 | int tmp0, tmp1; |
643 | s64 tmp2; |
644 | bool scale_db = false; |
645 | |
646 | switch (type) { |
647 | case IIO_VAL_INT: |
648 | return sysfs_emit_at(buf, at: offset, fmt: "%d" , vals[0]); |
649 | case IIO_VAL_INT_PLUS_MICRO_DB: |
650 | scale_db = true; |
651 | fallthrough; |
652 | case IIO_VAL_INT_PLUS_MICRO: |
653 | if (vals[1] < 0) |
654 | return sysfs_emit_at(buf, at: offset, fmt: "-%d.%06u%s" , |
655 | abs(vals[0]), -vals[1], |
656 | scale_db ? " dB" : "" ); |
657 | else |
658 | return sysfs_emit_at(buf, at: offset, fmt: "%d.%06u%s" , vals[0], |
659 | vals[1], scale_db ? " dB" : "" ); |
660 | case IIO_VAL_INT_PLUS_NANO: |
661 | if (vals[1] < 0) |
662 | return sysfs_emit_at(buf, at: offset, fmt: "-%d.%09u" , |
663 | abs(vals[0]), -vals[1]); |
664 | else |
665 | return sysfs_emit_at(buf, at: offset, fmt: "%d.%09u" , vals[0], |
666 | vals[1]); |
667 | case IIO_VAL_FRACTIONAL: |
668 | tmp2 = div_s64(dividend: (s64)vals[0] * 1000000000LL, divisor: vals[1]); |
669 | tmp1 = vals[1]; |
670 | tmp0 = (int)div_s64_rem(dividend: tmp2, divisor: 1000000000, remainder: &tmp1); |
671 | if ((tmp2 < 0) && (tmp0 == 0)) |
672 | return sysfs_emit_at(buf, at: offset, fmt: "-0.%09u" , abs(tmp1)); |
673 | else |
674 | return sysfs_emit_at(buf, at: offset, fmt: "%d.%09u" , tmp0, |
675 | abs(tmp1)); |
676 | case IIO_VAL_FRACTIONAL_LOG2: |
677 | tmp2 = shift_right((s64)vals[0] * 1000000000LL, vals[1]); |
678 | tmp0 = (int)div_s64_rem(dividend: tmp2, divisor: 1000000000LL, remainder: &tmp1); |
679 | if (tmp0 == 0 && tmp2 < 0) |
680 | return sysfs_emit_at(buf, at: offset, fmt: "-0.%09u" , abs(tmp1)); |
681 | else |
682 | return sysfs_emit_at(buf, at: offset, fmt: "%d.%09u" , tmp0, |
683 | abs(tmp1)); |
684 | case IIO_VAL_INT_MULTIPLE: |
685 | { |
686 | int i; |
687 | int l = 0; |
688 | |
689 | for (i = 0; i < size; ++i) |
690 | l += sysfs_emit_at(buf, at: offset + l, fmt: "%d " , vals[i]); |
691 | return l; |
692 | } |
693 | case IIO_VAL_CHAR: |
694 | return sysfs_emit_at(buf, at: offset, fmt: "%c" , (char)vals[0]); |
695 | case IIO_VAL_INT_64: |
696 | tmp2 = (s64)((((u64)vals[1]) << 32) | (u32)vals[0]); |
697 | return sysfs_emit_at(buf, at: offset, fmt: "%lld" , tmp2); |
698 | default: |
699 | return 0; |
700 | } |
701 | } |
702 | |
703 | /** |
704 | * iio_format_value() - Formats a IIO value into its string representation |
705 | * @buf: The buffer to which the formatted value gets written |
706 | * which is assumed to be big enough (i.e. PAGE_SIZE). |
707 | * @type: One of the IIO_VAL_* constants. This decides how the val |
708 | * and val2 parameters are formatted. |
709 | * @size: Number of IIO value entries contained in vals |
710 | * @vals: Pointer to the values, exact meaning depends on the |
711 | * type parameter. |
712 | * |
713 | * Returns: |
714 | * 0 by default, a negative number on failure or the total number of characters |
715 | * written for a type that belongs to the IIO_VAL_* constant. |
716 | */ |
717 | ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) |
718 | { |
719 | ssize_t len; |
720 | |
721 | len = __iio_format_value(buf, offset: 0, type, size, vals); |
722 | if (len >= PAGE_SIZE - 1) |
723 | return -EFBIG; |
724 | |
725 | return len + sysfs_emit_at(buf, at: len, fmt: "\n" ); |
726 | } |
727 | EXPORT_SYMBOL_GPL(iio_format_value); |
728 | |
729 | static ssize_t iio_read_channel_label(struct device *dev, |
730 | struct device_attribute *attr, |
731 | char *buf) |
732 | { |
733 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
734 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
735 | |
736 | if (indio_dev->info->read_label) |
737 | return indio_dev->info->read_label(indio_dev, this_attr->c, buf); |
738 | |
739 | if (this_attr->c->extend_name) |
740 | return sysfs_emit(buf, fmt: "%s\n" , this_attr->c->extend_name); |
741 | |
742 | return -EINVAL; |
743 | } |
744 | |
745 | static ssize_t iio_read_channel_info(struct device *dev, |
746 | struct device_attribute *attr, |
747 | char *buf) |
748 | { |
749 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
750 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
751 | int vals[INDIO_MAX_RAW_ELEMENTS]; |
752 | int ret; |
753 | int val_len = 2; |
754 | |
755 | if (indio_dev->info->read_raw_multi) |
756 | ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c, |
757 | INDIO_MAX_RAW_ELEMENTS, |
758 | vals, &val_len, |
759 | this_attr->address); |
760 | else |
761 | ret = indio_dev->info->read_raw(indio_dev, this_attr->c, |
762 | &vals[0], &vals[1], this_attr->address); |
763 | |
764 | if (ret < 0) |
765 | return ret; |
766 | |
767 | return iio_format_value(buf, ret, val_len, vals); |
768 | } |
769 | |
770 | static ssize_t iio_format_list(char *buf, const int *vals, int type, int length, |
771 | const char *prefix, const char *suffix) |
772 | { |
773 | ssize_t len; |
774 | int stride; |
775 | int i; |
776 | |
777 | switch (type) { |
778 | case IIO_VAL_INT: |
779 | stride = 1; |
780 | break; |
781 | default: |
782 | stride = 2; |
783 | break; |
784 | } |
785 | |
786 | len = sysfs_emit(buf, fmt: prefix); |
787 | |
788 | for (i = 0; i <= length - stride; i += stride) { |
789 | if (i != 0) { |
790 | len += sysfs_emit_at(buf, at: len, fmt: " " ); |
791 | if (len >= PAGE_SIZE) |
792 | return -EFBIG; |
793 | } |
794 | |
795 | len += __iio_format_value(buf, offset: len, type, size: stride, vals: &vals[i]); |
796 | if (len >= PAGE_SIZE) |
797 | return -EFBIG; |
798 | } |
799 | |
800 | len += sysfs_emit_at(buf, at: len, fmt: "%s\n" , suffix); |
801 | |
802 | return len; |
803 | } |
804 | |
805 | static ssize_t iio_format_avail_list(char *buf, const int *vals, |
806 | int type, int length) |
807 | { |
808 | |
809 | return iio_format_list(buf, vals, type, length, prefix: "" , suffix: "" ); |
810 | } |
811 | |
812 | static ssize_t iio_format_avail_range(char *buf, const int *vals, int type) |
813 | { |
814 | int length; |
815 | |
816 | /* |
817 | * length refers to the array size , not the number of elements. |
818 | * The purpose is to print the range [min , step ,max] so length should |
819 | * be 3 in case of int, and 6 for other types. |
820 | */ |
821 | switch (type) { |
822 | case IIO_VAL_INT: |
823 | length = 3; |
824 | break; |
825 | default: |
826 | length = 6; |
827 | break; |
828 | } |
829 | |
830 | return iio_format_list(buf, vals, type, length, prefix: "[" , suffix: "]" ); |
831 | } |
832 | |
833 | static ssize_t iio_read_channel_info_avail(struct device *dev, |
834 | struct device_attribute *attr, |
835 | char *buf) |
836 | { |
837 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
838 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
839 | const int *vals; |
840 | int ret; |
841 | int length; |
842 | int type; |
843 | |
844 | ret = indio_dev->info->read_avail(indio_dev, this_attr->c, |
845 | &vals, &type, &length, |
846 | this_attr->address); |
847 | |
848 | if (ret < 0) |
849 | return ret; |
850 | switch (ret) { |
851 | case IIO_AVAIL_LIST: |
852 | return iio_format_avail_list(buf, vals, type, length); |
853 | case IIO_AVAIL_RANGE: |
854 | return iio_format_avail_range(buf, vals, type); |
855 | default: |
856 | return -EINVAL; |
857 | } |
858 | } |
859 | |
860 | /** |
861 | * __iio_str_to_fixpoint() - Parse a fixed-point number from a string |
862 | * @str: The string to parse |
863 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 |
864 | * @integer: The integer part of the number |
865 | * @fract: The fractional part of the number |
866 | * @scale_db: True if this should parse as dB |
867 | * |
868 | * Returns: |
869 | * 0 on success, or a negative error code if the string could not be parsed. |
870 | */ |
871 | static int __iio_str_to_fixpoint(const char *str, int fract_mult, |
872 | int *integer, int *fract, bool scale_db) |
873 | { |
874 | int i = 0, f = 0; |
875 | bool integer_part = true, negative = false; |
876 | |
877 | if (fract_mult == 0) { |
878 | *fract = 0; |
879 | |
880 | return kstrtoint(s: str, base: 0, res: integer); |
881 | } |
882 | |
883 | if (str[0] == '-') { |
884 | negative = true; |
885 | str++; |
886 | } else if (str[0] == '+') { |
887 | str++; |
888 | } |
889 | |
890 | while (*str) { |
891 | if ('0' <= *str && *str <= '9') { |
892 | if (integer_part) { |
893 | i = i * 10 + *str - '0'; |
894 | } else { |
895 | f += fract_mult * (*str - '0'); |
896 | fract_mult /= 10; |
897 | } |
898 | } else if (*str == '\n') { |
899 | if (*(str + 1) == '\0') |
900 | break; |
901 | return -EINVAL; |
902 | } else if (!strncmp(str, " dB" , sizeof(" dB" ) - 1) && scale_db) { |
903 | /* Ignore the dB suffix */ |
904 | str += sizeof(" dB" ) - 1; |
905 | continue; |
906 | } else if (!strncmp(str, "dB" , sizeof("dB" ) - 1) && scale_db) { |
907 | /* Ignore the dB suffix */ |
908 | str += sizeof("dB" ) - 1; |
909 | continue; |
910 | } else if (*str == '.' && integer_part) { |
911 | integer_part = false; |
912 | } else { |
913 | return -EINVAL; |
914 | } |
915 | str++; |
916 | } |
917 | |
918 | if (negative) { |
919 | if (i) |
920 | i = -i; |
921 | else |
922 | f = -f; |
923 | } |
924 | |
925 | *integer = i; |
926 | *fract = f; |
927 | |
928 | return 0; |
929 | } |
930 | |
931 | /** |
932 | * iio_str_to_fixpoint() - Parse a fixed-point number from a string |
933 | * @str: The string to parse |
934 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 |
935 | * @integer: The integer part of the number |
936 | * @fract: The fractional part of the number |
937 | * |
938 | * Returns: |
939 | * 0 on success, or a negative error code if the string could not be parsed. |
940 | */ |
941 | int iio_str_to_fixpoint(const char *str, int fract_mult, |
942 | int *integer, int *fract) |
943 | { |
944 | return __iio_str_to_fixpoint(str, fract_mult, integer, fract, scale_db: false); |
945 | } |
946 | EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); |
947 | |
948 | static ssize_t iio_write_channel_info(struct device *dev, |
949 | struct device_attribute *attr, |
950 | const char *buf, |
951 | size_t len) |
952 | { |
953 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
954 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
955 | int ret, fract_mult = 100000; |
956 | int integer, fract = 0; |
957 | bool is_char = false; |
958 | bool scale_db = false; |
959 | |
960 | /* Assumes decimal - precision based on number of digits */ |
961 | if (!indio_dev->info->write_raw) |
962 | return -EINVAL; |
963 | |
964 | if (indio_dev->info->write_raw_get_fmt) |
965 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, |
966 | this_attr->c, this_attr->address)) { |
967 | case IIO_VAL_INT: |
968 | fract_mult = 0; |
969 | break; |
970 | case IIO_VAL_INT_PLUS_MICRO_DB: |
971 | scale_db = true; |
972 | fallthrough; |
973 | case IIO_VAL_INT_PLUS_MICRO: |
974 | fract_mult = 100000; |
975 | break; |
976 | case IIO_VAL_INT_PLUS_NANO: |
977 | fract_mult = 100000000; |
978 | break; |
979 | case IIO_VAL_CHAR: |
980 | is_char = true; |
981 | break; |
982 | default: |
983 | return -EINVAL; |
984 | } |
985 | |
986 | if (is_char) { |
987 | char ch; |
988 | |
989 | if (sscanf(buf, "%c" , &ch) != 1) |
990 | return -EINVAL; |
991 | integer = ch; |
992 | } else { |
993 | ret = __iio_str_to_fixpoint(str: buf, fract_mult, integer: &integer, fract: &fract, |
994 | scale_db); |
995 | if (ret) |
996 | return ret; |
997 | } |
998 | |
999 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
1000 | integer, fract, this_attr->address); |
1001 | if (ret) |
1002 | return ret; |
1003 | |
1004 | return len; |
1005 | } |
1006 | |
1007 | static |
1008 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
1009 | const char *postfix, |
1010 | struct iio_chan_spec const *chan, |
1011 | ssize_t (*readfunc)(struct device *dev, |
1012 | struct device_attribute *attr, |
1013 | char *buf), |
1014 | ssize_t (*writefunc)(struct device *dev, |
1015 | struct device_attribute *attr, |
1016 | const char *buf, |
1017 | size_t len), |
1018 | enum iio_shared_by shared_by) |
1019 | { |
1020 | int ret = 0; |
1021 | char *name = NULL; |
1022 | char *full_postfix; |
1023 | |
1024 | sysfs_attr_init(&dev_attr->attr); |
1025 | |
1026 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
1027 | if (chan->modified && (shared_by == IIO_SEPARATE)) { |
1028 | if (chan->extend_name) |
1029 | full_postfix = kasprintf(GFP_KERNEL, fmt: "%s_%s_%s" , |
1030 | iio_modifier_names[chan->channel2], |
1031 | chan->extend_name, |
1032 | postfix); |
1033 | else |
1034 | full_postfix = kasprintf(GFP_KERNEL, fmt: "%s_%s" , |
1035 | iio_modifier_names[chan->channel2], |
1036 | postfix); |
1037 | } else { |
1038 | if (chan->extend_name == NULL || shared_by != IIO_SEPARATE) |
1039 | full_postfix = kstrdup(s: postfix, GFP_KERNEL); |
1040 | else |
1041 | full_postfix = kasprintf(GFP_KERNEL, |
1042 | fmt: "%s_%s" , |
1043 | chan->extend_name, |
1044 | postfix); |
1045 | } |
1046 | if (full_postfix == NULL) |
1047 | return -ENOMEM; |
1048 | |
1049 | if (chan->differential) { /* Differential can not have modifier */ |
1050 | switch (shared_by) { |
1051 | case IIO_SHARED_BY_ALL: |
1052 | name = kasprintf(GFP_KERNEL, fmt: "%s" , full_postfix); |
1053 | break; |
1054 | case IIO_SHARED_BY_DIR: |
1055 | name = kasprintf(GFP_KERNEL, fmt: "%s_%s" , |
1056 | iio_direction[chan->output], |
1057 | full_postfix); |
1058 | break; |
1059 | case IIO_SHARED_BY_TYPE: |
1060 | name = kasprintf(GFP_KERNEL, fmt: "%s_%s-%s_%s" , |
1061 | iio_direction[chan->output], |
1062 | iio_chan_type_name_spec[chan->type], |
1063 | iio_chan_type_name_spec[chan->type], |
1064 | full_postfix); |
1065 | break; |
1066 | case IIO_SEPARATE: |
1067 | if (!chan->indexed) { |
1068 | WARN(1, "Differential channels must be indexed\n" ); |
1069 | ret = -EINVAL; |
1070 | goto error_free_full_postfix; |
1071 | } |
1072 | name = kasprintf(GFP_KERNEL, |
1073 | fmt: "%s_%s%d-%s%d_%s" , |
1074 | iio_direction[chan->output], |
1075 | iio_chan_type_name_spec[chan->type], |
1076 | chan->channel, |
1077 | iio_chan_type_name_spec[chan->type], |
1078 | chan->channel2, |
1079 | full_postfix); |
1080 | break; |
1081 | } |
1082 | } else { /* Single ended */ |
1083 | switch (shared_by) { |
1084 | case IIO_SHARED_BY_ALL: |
1085 | name = kasprintf(GFP_KERNEL, fmt: "%s" , full_postfix); |
1086 | break; |
1087 | case IIO_SHARED_BY_DIR: |
1088 | name = kasprintf(GFP_KERNEL, fmt: "%s_%s" , |
1089 | iio_direction[chan->output], |
1090 | full_postfix); |
1091 | break; |
1092 | case IIO_SHARED_BY_TYPE: |
1093 | name = kasprintf(GFP_KERNEL, fmt: "%s_%s_%s" , |
1094 | iio_direction[chan->output], |
1095 | iio_chan_type_name_spec[chan->type], |
1096 | full_postfix); |
1097 | break; |
1098 | |
1099 | case IIO_SEPARATE: |
1100 | if (chan->indexed) |
1101 | name = kasprintf(GFP_KERNEL, fmt: "%s_%s%d_%s" , |
1102 | iio_direction[chan->output], |
1103 | iio_chan_type_name_spec[chan->type], |
1104 | chan->channel, |
1105 | full_postfix); |
1106 | else |
1107 | name = kasprintf(GFP_KERNEL, fmt: "%s_%s_%s" , |
1108 | iio_direction[chan->output], |
1109 | iio_chan_type_name_spec[chan->type], |
1110 | full_postfix); |
1111 | break; |
1112 | } |
1113 | } |
1114 | if (name == NULL) { |
1115 | ret = -ENOMEM; |
1116 | goto error_free_full_postfix; |
1117 | } |
1118 | dev_attr->attr.name = name; |
1119 | |
1120 | if (readfunc) { |
1121 | dev_attr->attr.mode |= 0444; |
1122 | dev_attr->show = readfunc; |
1123 | } |
1124 | |
1125 | if (writefunc) { |
1126 | dev_attr->attr.mode |= 0200; |
1127 | dev_attr->store = writefunc; |
1128 | } |
1129 | |
1130 | error_free_full_postfix: |
1131 | kfree(objp: full_postfix); |
1132 | |
1133 | return ret; |
1134 | } |
1135 | |
1136 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1137 | { |
1138 | kfree(objp: dev_attr->attr.name); |
1139 | } |
1140 | |
1141 | int __iio_add_chan_devattr(const char *postfix, |
1142 | struct iio_chan_spec const *chan, |
1143 | ssize_t (*readfunc)(struct device *dev, |
1144 | struct device_attribute *attr, |
1145 | char *buf), |
1146 | ssize_t (*writefunc)(struct device *dev, |
1147 | struct device_attribute *attr, |
1148 | const char *buf, |
1149 | size_t len), |
1150 | u64 mask, |
1151 | enum iio_shared_by shared_by, |
1152 | struct device *dev, |
1153 | struct iio_buffer *buffer, |
1154 | struct list_head *attr_list) |
1155 | { |
1156 | int ret; |
1157 | struct iio_dev_attr *iio_attr, *t; |
1158 | |
1159 | iio_attr = kzalloc(size: sizeof(*iio_attr), GFP_KERNEL); |
1160 | if (iio_attr == NULL) |
1161 | return -ENOMEM; |
1162 | ret = __iio_device_attr_init(dev_attr: &iio_attr->dev_attr, |
1163 | postfix, chan, |
1164 | readfunc, writefunc, shared_by); |
1165 | if (ret) |
1166 | goto error_iio_dev_attr_free; |
1167 | iio_attr->c = chan; |
1168 | iio_attr->address = mask; |
1169 | iio_attr->buffer = buffer; |
1170 | list_for_each_entry(t, attr_list, l) |
1171 | if (strcmp(t->dev_attr.attr.name, |
1172 | iio_attr->dev_attr.attr.name) == 0) { |
1173 | if (shared_by == IIO_SEPARATE) |
1174 | dev_err(dev, "tried to double register : %s\n" , |
1175 | t->dev_attr.attr.name); |
1176 | ret = -EBUSY; |
1177 | goto error_device_attr_deinit; |
1178 | } |
1179 | list_add(new: &iio_attr->l, head: attr_list); |
1180 | |
1181 | return 0; |
1182 | |
1183 | error_device_attr_deinit: |
1184 | __iio_device_attr_deinit(dev_attr: &iio_attr->dev_attr); |
1185 | error_iio_dev_attr_free: |
1186 | kfree(objp: iio_attr); |
1187 | return ret; |
1188 | } |
1189 | |
1190 | static int iio_device_add_channel_label(struct iio_dev *indio_dev, |
1191 | struct iio_chan_spec const *chan) |
1192 | { |
1193 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1194 | int ret; |
1195 | |
1196 | if (!indio_dev->info->read_label && !chan->extend_name) |
1197 | return 0; |
1198 | |
1199 | ret = __iio_add_chan_devattr(postfix: "label" , |
1200 | chan, |
1201 | readfunc: &iio_read_channel_label, |
1202 | NULL, |
1203 | mask: 0, |
1204 | shared_by: IIO_SEPARATE, |
1205 | dev: &indio_dev->dev, |
1206 | NULL, |
1207 | attr_list: &iio_dev_opaque->channel_attr_list); |
1208 | if (ret < 0) |
1209 | return ret; |
1210 | |
1211 | return 1; |
1212 | } |
1213 | |
1214 | static int iio_device_add_info_mask_type(struct iio_dev *indio_dev, |
1215 | struct iio_chan_spec const *chan, |
1216 | enum iio_shared_by shared_by, |
1217 | const long *infomask) |
1218 | { |
1219 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1220 | int i, ret, attrcount = 0; |
1221 | |
1222 | for_each_set_bit(i, infomask, sizeof(*infomask)*8) { |
1223 | if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
1224 | return -EINVAL; |
1225 | ret = __iio_add_chan_devattr(postfix: iio_chan_info_postfix[i], |
1226 | chan, |
1227 | readfunc: &iio_read_channel_info, |
1228 | writefunc: &iio_write_channel_info, |
1229 | mask: i, |
1230 | shared_by, |
1231 | dev: &indio_dev->dev, |
1232 | NULL, |
1233 | attr_list: &iio_dev_opaque->channel_attr_list); |
1234 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
1235 | continue; |
1236 | if (ret < 0) |
1237 | return ret; |
1238 | attrcount++; |
1239 | } |
1240 | |
1241 | return attrcount; |
1242 | } |
1243 | |
1244 | static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev, |
1245 | struct iio_chan_spec const *chan, |
1246 | enum iio_shared_by shared_by, |
1247 | const long *infomask) |
1248 | { |
1249 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1250 | int i, ret, attrcount = 0; |
1251 | char *avail_postfix; |
1252 | |
1253 | for_each_set_bit(i, infomask, sizeof(*infomask) * 8) { |
1254 | if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
1255 | return -EINVAL; |
1256 | avail_postfix = kasprintf(GFP_KERNEL, |
1257 | fmt: "%s_available" , |
1258 | iio_chan_info_postfix[i]); |
1259 | if (!avail_postfix) |
1260 | return -ENOMEM; |
1261 | |
1262 | ret = __iio_add_chan_devattr(postfix: avail_postfix, |
1263 | chan, |
1264 | readfunc: &iio_read_channel_info_avail, |
1265 | NULL, |
1266 | mask: i, |
1267 | shared_by, |
1268 | dev: &indio_dev->dev, |
1269 | NULL, |
1270 | attr_list: &iio_dev_opaque->channel_attr_list); |
1271 | kfree(objp: avail_postfix); |
1272 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
1273 | continue; |
1274 | if (ret < 0) |
1275 | return ret; |
1276 | attrcount++; |
1277 | } |
1278 | |
1279 | return attrcount; |
1280 | } |
1281 | |
1282 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, |
1283 | struct iio_chan_spec const *chan) |
1284 | { |
1285 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1286 | int ret, attrcount = 0; |
1287 | const struct iio_chan_spec_ext_info *ext_info; |
1288 | |
1289 | if (chan->channel < 0) |
1290 | return 0; |
1291 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1292 | shared_by: IIO_SEPARATE, |
1293 | infomask: &chan->info_mask_separate); |
1294 | if (ret < 0) |
1295 | return ret; |
1296 | attrcount += ret; |
1297 | |
1298 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1299 | shared_by: IIO_SEPARATE, |
1300 | infomask: &chan->info_mask_separate_available); |
1301 | if (ret < 0) |
1302 | return ret; |
1303 | attrcount += ret; |
1304 | |
1305 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1306 | shared_by: IIO_SHARED_BY_TYPE, |
1307 | infomask: &chan->info_mask_shared_by_type); |
1308 | if (ret < 0) |
1309 | return ret; |
1310 | attrcount += ret; |
1311 | |
1312 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1313 | shared_by: IIO_SHARED_BY_TYPE, |
1314 | infomask: &chan->info_mask_shared_by_type_available); |
1315 | if (ret < 0) |
1316 | return ret; |
1317 | attrcount += ret; |
1318 | |
1319 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1320 | shared_by: IIO_SHARED_BY_DIR, |
1321 | infomask: &chan->info_mask_shared_by_dir); |
1322 | if (ret < 0) |
1323 | return ret; |
1324 | attrcount += ret; |
1325 | |
1326 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1327 | shared_by: IIO_SHARED_BY_DIR, |
1328 | infomask: &chan->info_mask_shared_by_dir_available); |
1329 | if (ret < 0) |
1330 | return ret; |
1331 | attrcount += ret; |
1332 | |
1333 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1334 | shared_by: IIO_SHARED_BY_ALL, |
1335 | infomask: &chan->info_mask_shared_by_all); |
1336 | if (ret < 0) |
1337 | return ret; |
1338 | attrcount += ret; |
1339 | |
1340 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1341 | shared_by: IIO_SHARED_BY_ALL, |
1342 | infomask: &chan->info_mask_shared_by_all_available); |
1343 | if (ret < 0) |
1344 | return ret; |
1345 | attrcount += ret; |
1346 | |
1347 | ret = iio_device_add_channel_label(indio_dev, chan); |
1348 | if (ret < 0) |
1349 | return ret; |
1350 | attrcount += ret; |
1351 | |
1352 | if (chan->ext_info) { |
1353 | unsigned int i = 0; |
1354 | |
1355 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { |
1356 | ret = __iio_add_chan_devattr(postfix: ext_info->name, |
1357 | chan, |
1358 | readfunc: ext_info->read ? |
1359 | &iio_read_channel_ext_info : NULL, |
1360 | writefunc: ext_info->write ? |
1361 | &iio_write_channel_ext_info : NULL, |
1362 | mask: i, |
1363 | shared_by: ext_info->shared, |
1364 | dev: &indio_dev->dev, |
1365 | NULL, |
1366 | attr_list: &iio_dev_opaque->channel_attr_list); |
1367 | i++; |
1368 | if (ret == -EBUSY && ext_info->shared) |
1369 | continue; |
1370 | |
1371 | if (ret) |
1372 | return ret; |
1373 | |
1374 | attrcount++; |
1375 | } |
1376 | } |
1377 | |
1378 | return attrcount; |
1379 | } |
1380 | |
1381 | /** |
1382 | * iio_free_chan_devattr_list() - Free a list of IIO device attributes |
1383 | * @attr_list: List of IIO device attributes |
1384 | * |
1385 | * This function frees the memory allocated for each of the IIO device |
1386 | * attributes in the list. |
1387 | */ |
1388 | void iio_free_chan_devattr_list(struct list_head *attr_list) |
1389 | { |
1390 | struct iio_dev_attr *p, *n; |
1391 | |
1392 | list_for_each_entry_safe(p, n, attr_list, l) { |
1393 | kfree_const(x: p->dev_attr.attr.name); |
1394 | list_del(entry: &p->l); |
1395 | kfree(objp: p); |
1396 | } |
1397 | } |
1398 | |
1399 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, |
1400 | char *buf) |
1401 | { |
1402 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1403 | |
1404 | return sysfs_emit(buf, fmt: "%s\n" , indio_dev->name); |
1405 | } |
1406 | |
1407 | static DEVICE_ATTR_RO(name); |
1408 | |
1409 | static ssize_t label_show(struct device *dev, struct device_attribute *attr, |
1410 | char *buf) |
1411 | { |
1412 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1413 | |
1414 | return sysfs_emit(buf, fmt: "%s\n" , indio_dev->label); |
1415 | } |
1416 | |
1417 | static DEVICE_ATTR_RO(label); |
1418 | |
1419 | static const char * const clock_names[] = { |
1420 | [CLOCK_REALTIME] = "realtime" , |
1421 | [CLOCK_MONOTONIC] = "monotonic" , |
1422 | [CLOCK_PROCESS_CPUTIME_ID] = "process_cputime_id" , |
1423 | [CLOCK_THREAD_CPUTIME_ID] = "thread_cputime_id" , |
1424 | [CLOCK_MONOTONIC_RAW] = "monotonic_raw" , |
1425 | [CLOCK_REALTIME_COARSE] = "realtime_coarse" , |
1426 | [CLOCK_MONOTONIC_COARSE] = "monotonic_coarse" , |
1427 | [CLOCK_BOOTTIME] = "boottime" , |
1428 | [CLOCK_REALTIME_ALARM] = "realtime_alarm" , |
1429 | [CLOCK_BOOTTIME_ALARM] = "boottime_alarm" , |
1430 | [CLOCK_SGI_CYCLE] = "sgi_cycle" , |
1431 | [CLOCK_TAI] = "tai" , |
1432 | }; |
1433 | |
1434 | static ssize_t current_timestamp_clock_show(struct device *dev, |
1435 | struct device_attribute *attr, |
1436 | char *buf) |
1437 | { |
1438 | const struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1439 | const clockid_t clk = iio_device_get_clock(indio_dev); |
1440 | |
1441 | switch (clk) { |
1442 | case CLOCK_REALTIME: |
1443 | case CLOCK_MONOTONIC: |
1444 | case CLOCK_MONOTONIC_RAW: |
1445 | case CLOCK_REALTIME_COARSE: |
1446 | case CLOCK_MONOTONIC_COARSE: |
1447 | case CLOCK_BOOTTIME: |
1448 | case CLOCK_TAI: |
1449 | break; |
1450 | default: |
1451 | BUG(); |
1452 | } |
1453 | |
1454 | return sysfs_emit(buf, fmt: "%s\n" , clock_names[clk]); |
1455 | } |
1456 | |
1457 | static ssize_t current_timestamp_clock_store(struct device *dev, |
1458 | struct device_attribute *attr, |
1459 | const char *buf, size_t len) |
1460 | { |
1461 | clockid_t clk; |
1462 | int ret; |
1463 | |
1464 | ret = sysfs_match_string(clock_names, buf); |
1465 | if (ret < 0) |
1466 | return ret; |
1467 | clk = ret; |
1468 | |
1469 | switch (clk) { |
1470 | case CLOCK_REALTIME: |
1471 | case CLOCK_MONOTONIC: |
1472 | case CLOCK_MONOTONIC_RAW: |
1473 | case CLOCK_REALTIME_COARSE: |
1474 | case CLOCK_MONOTONIC_COARSE: |
1475 | case CLOCK_BOOTTIME: |
1476 | case CLOCK_TAI: |
1477 | break; |
1478 | default: |
1479 | return -EINVAL; |
1480 | } |
1481 | |
1482 | ret = iio_device_set_clock(dev_to_iio_dev(dev), clk); |
1483 | if (ret) |
1484 | return ret; |
1485 | |
1486 | return len; |
1487 | } |
1488 | |
1489 | int iio_device_register_sysfs_group(struct iio_dev *indio_dev, |
1490 | const struct attribute_group *group) |
1491 | { |
1492 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1493 | const struct attribute_group **new, **old = iio_dev_opaque->groups; |
1494 | unsigned int cnt = iio_dev_opaque->groupcounter; |
1495 | |
1496 | new = krealloc_array(p: old, new_n: cnt + 2, new_size: sizeof(*new), GFP_KERNEL); |
1497 | if (!new) |
1498 | return -ENOMEM; |
1499 | |
1500 | new[iio_dev_opaque->groupcounter++] = group; |
1501 | new[iio_dev_opaque->groupcounter] = NULL; |
1502 | |
1503 | iio_dev_opaque->groups = new; |
1504 | |
1505 | return 0; |
1506 | } |
1507 | |
1508 | static DEVICE_ATTR_RW(current_timestamp_clock); |
1509 | |
1510 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1511 | { |
1512 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1513 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
1514 | struct iio_dev_attr *p; |
1515 | struct attribute **attr, *clk = NULL; |
1516 | |
1517 | /* First count elements in any existing group */ |
1518 | if (indio_dev->info->attrs) { |
1519 | attr = indio_dev->info->attrs->attrs; |
1520 | while (*attr++ != NULL) |
1521 | attrcount_orig++; |
1522 | } |
1523 | attrcount = attrcount_orig; |
1524 | /* |
1525 | * New channel registration method - relies on the fact a group does |
1526 | * not need to be initialized if its name is NULL. |
1527 | */ |
1528 | if (indio_dev->channels) |
1529 | for (i = 0; i < indio_dev->num_channels; i++) { |
1530 | const struct iio_chan_spec *chan = |
1531 | &indio_dev->channels[i]; |
1532 | |
1533 | if (chan->type == IIO_TIMESTAMP) |
1534 | clk = &dev_attr_current_timestamp_clock.attr; |
1535 | |
1536 | ret = iio_device_add_channel_sysfs(indio_dev, chan); |
1537 | if (ret < 0) |
1538 | goto error_clear_attrs; |
1539 | attrcount += ret; |
1540 | } |
1541 | |
1542 | if (iio_dev_opaque->event_interface) |
1543 | clk = &dev_attr_current_timestamp_clock.attr; |
1544 | |
1545 | if (indio_dev->name) |
1546 | attrcount++; |
1547 | if (indio_dev->label) |
1548 | attrcount++; |
1549 | if (clk) |
1550 | attrcount++; |
1551 | |
1552 | iio_dev_opaque->chan_attr_group.attrs = |
1553 | kcalloc(n: attrcount + 1, |
1554 | size: sizeof(iio_dev_opaque->chan_attr_group.attrs[0]), |
1555 | GFP_KERNEL); |
1556 | if (iio_dev_opaque->chan_attr_group.attrs == NULL) { |
1557 | ret = -ENOMEM; |
1558 | goto error_clear_attrs; |
1559 | } |
1560 | /* Copy across original attributes, and point to original binary attributes */ |
1561 | if (indio_dev->info->attrs) { |
1562 | memcpy(iio_dev_opaque->chan_attr_group.attrs, |
1563 | indio_dev->info->attrs->attrs, |
1564 | sizeof(iio_dev_opaque->chan_attr_group.attrs[0]) |
1565 | *attrcount_orig); |
1566 | iio_dev_opaque->chan_attr_group.is_visible = |
1567 | indio_dev->info->attrs->is_visible; |
1568 | iio_dev_opaque->chan_attr_group.bin_attrs = |
1569 | indio_dev->info->attrs->bin_attrs; |
1570 | } |
1571 | attrn = attrcount_orig; |
1572 | /* Add all elements from the list. */ |
1573 | list_for_each_entry(p, &iio_dev_opaque->channel_attr_list, l) |
1574 | iio_dev_opaque->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; |
1575 | if (indio_dev->name) |
1576 | iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; |
1577 | if (indio_dev->label) |
1578 | iio_dev_opaque->chan_attr_group.attrs[attrn++] = &dev_attr_label.attr; |
1579 | if (clk) |
1580 | iio_dev_opaque->chan_attr_group.attrs[attrn++] = clk; |
1581 | |
1582 | ret = iio_device_register_sysfs_group(indio_dev, |
1583 | group: &iio_dev_opaque->chan_attr_group); |
1584 | if (ret) |
1585 | goto error_free_chan_attrs; |
1586 | |
1587 | return 0; |
1588 | |
1589 | error_free_chan_attrs: |
1590 | kfree(objp: iio_dev_opaque->chan_attr_group.attrs); |
1591 | iio_dev_opaque->chan_attr_group.attrs = NULL; |
1592 | error_clear_attrs: |
1593 | iio_free_chan_devattr_list(attr_list: &iio_dev_opaque->channel_attr_list); |
1594 | |
1595 | return ret; |
1596 | } |
1597 | |
1598 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
1599 | { |
1600 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1601 | |
1602 | iio_free_chan_devattr_list(attr_list: &iio_dev_opaque->channel_attr_list); |
1603 | kfree(objp: iio_dev_opaque->chan_attr_group.attrs); |
1604 | iio_dev_opaque->chan_attr_group.attrs = NULL; |
1605 | kfree(objp: iio_dev_opaque->groups); |
1606 | iio_dev_opaque->groups = NULL; |
1607 | } |
1608 | |
1609 | static void iio_dev_release(struct device *device) |
1610 | { |
1611 | struct iio_dev *indio_dev = dev_to_iio_dev(dev: device); |
1612 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1613 | |
1614 | if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES) |
1615 | iio_device_unregister_trigger_consumer(indio_dev); |
1616 | iio_device_unregister_eventset(indio_dev); |
1617 | iio_device_unregister_sysfs(indio_dev); |
1618 | |
1619 | iio_device_detach_buffers(indio_dev); |
1620 | |
1621 | lockdep_unregister_key(key: &iio_dev_opaque->mlock_key); |
1622 | |
1623 | ida_free(&iio_ida, id: iio_dev_opaque->id); |
1624 | kfree(objp: iio_dev_opaque); |
1625 | } |
1626 | |
1627 | const struct device_type iio_device_type = { |
1628 | .name = "iio_device" , |
1629 | .release = iio_dev_release, |
1630 | }; |
1631 | |
1632 | /** |
1633 | * iio_device_alloc() - allocate an iio_dev from a driver |
1634 | * @parent: Parent device. |
1635 | * @sizeof_priv: Space to allocate for private structure. |
1636 | * |
1637 | * Returns: |
1638 | * Pointer to allocated iio_dev on success, NULL on failure. |
1639 | */ |
1640 | struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv) |
1641 | { |
1642 | struct iio_dev_opaque *iio_dev_opaque; |
1643 | struct iio_dev *indio_dev; |
1644 | size_t alloc_size; |
1645 | |
1646 | alloc_size = sizeof(struct iio_dev_opaque); |
1647 | if (sizeof_priv) { |
1648 | alloc_size = ALIGN(alloc_size, IIO_DMA_MINALIGN); |
1649 | alloc_size += sizeof_priv; |
1650 | } |
1651 | |
1652 | iio_dev_opaque = kzalloc(size: alloc_size, GFP_KERNEL); |
1653 | if (!iio_dev_opaque) |
1654 | return NULL; |
1655 | |
1656 | indio_dev = &iio_dev_opaque->indio_dev; |
1657 | indio_dev->priv = (char *)iio_dev_opaque + |
1658 | ALIGN(sizeof(struct iio_dev_opaque), IIO_DMA_MINALIGN); |
1659 | |
1660 | indio_dev->dev.parent = parent; |
1661 | indio_dev->dev.type = &iio_device_type; |
1662 | indio_dev->dev.bus = &iio_bus_type; |
1663 | device_initialize(dev: &indio_dev->dev); |
1664 | mutex_init(&iio_dev_opaque->mlock); |
1665 | mutex_init(&iio_dev_opaque->info_exist_lock); |
1666 | INIT_LIST_HEAD(list: &iio_dev_opaque->channel_attr_list); |
1667 | |
1668 | iio_dev_opaque->id = ida_alloc(ida: &iio_ida, GFP_KERNEL); |
1669 | if (iio_dev_opaque->id < 0) { |
1670 | /* cannot use a dev_err as the name isn't available */ |
1671 | pr_err("failed to get device id\n" ); |
1672 | kfree(objp: iio_dev_opaque); |
1673 | return NULL; |
1674 | } |
1675 | |
1676 | if (dev_set_name(dev: &indio_dev->dev, name: "iio:device%d" , iio_dev_opaque->id)) { |
1677 | ida_free(&iio_ida, id: iio_dev_opaque->id); |
1678 | kfree(objp: iio_dev_opaque); |
1679 | return NULL; |
1680 | } |
1681 | |
1682 | INIT_LIST_HEAD(list: &iio_dev_opaque->buffer_list); |
1683 | INIT_LIST_HEAD(list: &iio_dev_opaque->ioctl_handlers); |
1684 | |
1685 | lockdep_register_key(key: &iio_dev_opaque->mlock_key); |
1686 | lockdep_set_class(&iio_dev_opaque->mlock, &iio_dev_opaque->mlock_key); |
1687 | |
1688 | return indio_dev; |
1689 | } |
1690 | EXPORT_SYMBOL(iio_device_alloc); |
1691 | |
1692 | /** |
1693 | * iio_device_free() - free an iio_dev from a driver |
1694 | * @dev: the iio_dev associated with the device |
1695 | */ |
1696 | void iio_device_free(struct iio_dev *dev) |
1697 | { |
1698 | if (dev) |
1699 | put_device(dev: &dev->dev); |
1700 | } |
1701 | EXPORT_SYMBOL(iio_device_free); |
1702 | |
1703 | static void devm_iio_device_release(void *iio_dev) |
1704 | { |
1705 | iio_device_free(iio_dev); |
1706 | } |
1707 | |
1708 | /** |
1709 | * devm_iio_device_alloc - Resource-managed iio_device_alloc() |
1710 | * @parent: Device to allocate iio_dev for, and parent for this IIO device |
1711 | * @sizeof_priv: Space to allocate for private structure. |
1712 | * |
1713 | * Managed iio_device_alloc. iio_dev allocated with this function is |
1714 | * automatically freed on driver detach. |
1715 | * |
1716 | * Returns: |
1717 | * Pointer to allocated iio_dev on success, NULL on failure. |
1718 | */ |
1719 | struct iio_dev *devm_iio_device_alloc(struct device *parent, int sizeof_priv) |
1720 | { |
1721 | struct iio_dev *iio_dev; |
1722 | int ret; |
1723 | |
1724 | iio_dev = iio_device_alloc(parent, sizeof_priv); |
1725 | if (!iio_dev) |
1726 | return NULL; |
1727 | |
1728 | ret = devm_add_action_or_reset(parent, devm_iio_device_release, |
1729 | iio_dev); |
1730 | if (ret) |
1731 | return NULL; |
1732 | |
1733 | return iio_dev; |
1734 | } |
1735 | EXPORT_SYMBOL_GPL(devm_iio_device_alloc); |
1736 | |
1737 | /** |
1738 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
1739 | * @inode: Inode structure for identifying the device in the file system |
1740 | * @filp: File structure for iio device used to keep and later access |
1741 | * private data |
1742 | * |
1743 | * Returns: 0 on success or -EBUSY if the device is already opened |
1744 | */ |
1745 | static int iio_chrdev_open(struct inode *inode, struct file *filp) |
1746 | { |
1747 | struct iio_dev_opaque *iio_dev_opaque = |
1748 | container_of(inode->i_cdev, struct iio_dev_opaque, chrdev); |
1749 | struct iio_dev *indio_dev = &iio_dev_opaque->indio_dev; |
1750 | struct iio_dev_buffer_pair *ib; |
1751 | |
1752 | if (test_and_set_bit(IIO_BUSY_BIT_POS, addr: &iio_dev_opaque->flags)) |
1753 | return -EBUSY; |
1754 | |
1755 | iio_device_get(indio_dev); |
1756 | |
1757 | ib = kmalloc(size: sizeof(*ib), GFP_KERNEL); |
1758 | if (!ib) { |
1759 | iio_device_put(indio_dev); |
1760 | clear_bit(IIO_BUSY_BIT_POS, addr: &iio_dev_opaque->flags); |
1761 | return -ENOMEM; |
1762 | } |
1763 | |
1764 | ib->indio_dev = indio_dev; |
1765 | ib->buffer = indio_dev->buffer; |
1766 | |
1767 | filp->private_data = ib; |
1768 | |
1769 | return 0; |
1770 | } |
1771 | |
1772 | /** |
1773 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
1774 | * @inode: Inode structure pointer for the char device |
1775 | * @filp: File structure pointer for the char device |
1776 | * |
1777 | * Returns: 0 for successful release. |
1778 | */ |
1779 | static int iio_chrdev_release(struct inode *inode, struct file *filp) |
1780 | { |
1781 | struct iio_dev_buffer_pair *ib = filp->private_data; |
1782 | struct iio_dev_opaque *iio_dev_opaque = |
1783 | container_of(inode->i_cdev, struct iio_dev_opaque, chrdev); |
1784 | struct iio_dev *indio_dev = &iio_dev_opaque->indio_dev; |
1785 | |
1786 | kfree(objp: ib); |
1787 | clear_bit(IIO_BUSY_BIT_POS, addr: &iio_dev_opaque->flags); |
1788 | iio_device_put(indio_dev); |
1789 | |
1790 | return 0; |
1791 | } |
1792 | |
1793 | void iio_device_ioctl_handler_register(struct iio_dev *indio_dev, |
1794 | struct iio_ioctl_handler *h) |
1795 | { |
1796 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1797 | |
1798 | list_add_tail(new: &h->entry, head: &iio_dev_opaque->ioctl_handlers); |
1799 | } |
1800 | |
1801 | void iio_device_ioctl_handler_unregister(struct iio_ioctl_handler *h) |
1802 | { |
1803 | list_del(entry: &h->entry); |
1804 | } |
1805 | |
1806 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1807 | { |
1808 | struct iio_dev_buffer_pair *ib = filp->private_data; |
1809 | struct iio_dev *indio_dev = ib->indio_dev; |
1810 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1811 | struct iio_ioctl_handler *h; |
1812 | int ret = -ENODEV; |
1813 | |
1814 | mutex_lock(&iio_dev_opaque->info_exist_lock); |
1815 | |
1816 | /* |
1817 | * The NULL check here is required to prevent crashing when a device |
1818 | * is being removed while userspace would still have open file handles |
1819 | * to try to access this device. |
1820 | */ |
1821 | if (!indio_dev->info) |
1822 | goto out_unlock; |
1823 | |
1824 | list_for_each_entry(h, &iio_dev_opaque->ioctl_handlers, entry) { |
1825 | ret = h->ioctl(indio_dev, filp, cmd, arg); |
1826 | if (ret != IIO_IOCTL_UNHANDLED) |
1827 | break; |
1828 | } |
1829 | |
1830 | if (ret == IIO_IOCTL_UNHANDLED) |
1831 | ret = -ENODEV; |
1832 | |
1833 | out_unlock: |
1834 | mutex_unlock(lock: &iio_dev_opaque->info_exist_lock); |
1835 | |
1836 | return ret; |
1837 | } |
1838 | |
1839 | static const struct file_operations iio_buffer_fileops = { |
1840 | .owner = THIS_MODULE, |
1841 | .llseek = noop_llseek, |
1842 | .read = iio_buffer_read_outer_addr, |
1843 | .write = iio_buffer_write_outer_addr, |
1844 | .poll = iio_buffer_poll_addr, |
1845 | .unlocked_ioctl = iio_ioctl, |
1846 | .compat_ioctl = compat_ptr_ioctl, |
1847 | .open = iio_chrdev_open, |
1848 | .release = iio_chrdev_release, |
1849 | }; |
1850 | |
1851 | static const struct file_operations iio_event_fileops = { |
1852 | .owner = THIS_MODULE, |
1853 | .llseek = noop_llseek, |
1854 | .unlocked_ioctl = iio_ioctl, |
1855 | .compat_ioctl = compat_ptr_ioctl, |
1856 | .open = iio_chrdev_open, |
1857 | .release = iio_chrdev_release, |
1858 | }; |
1859 | |
1860 | static int iio_check_unique_scan_index(struct iio_dev *indio_dev) |
1861 | { |
1862 | int i, j; |
1863 | const struct iio_chan_spec *channels = indio_dev->channels; |
1864 | |
1865 | if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES)) |
1866 | return 0; |
1867 | |
1868 | for (i = 0; i < indio_dev->num_channels - 1; i++) { |
1869 | if (channels[i].scan_index < 0) |
1870 | continue; |
1871 | for (j = i + 1; j < indio_dev->num_channels; j++) |
1872 | if (channels[i].scan_index == channels[j].scan_index) { |
1873 | dev_err(&indio_dev->dev, |
1874 | "Duplicate scan index %d\n" , |
1875 | channels[i].scan_index); |
1876 | return -EINVAL; |
1877 | } |
1878 | } |
1879 | |
1880 | return 0; |
1881 | } |
1882 | |
1883 | static int iio_check_extended_name(const struct iio_dev *indio_dev) |
1884 | { |
1885 | unsigned int i; |
1886 | |
1887 | if (!indio_dev->info->read_label) |
1888 | return 0; |
1889 | |
1890 | for (i = 0; i < indio_dev->num_channels; i++) { |
1891 | if (indio_dev->channels[i].extend_name) { |
1892 | dev_err(&indio_dev->dev, |
1893 | "Cannot use labels and extend_name at the same time\n" ); |
1894 | return -EINVAL; |
1895 | } |
1896 | } |
1897 | |
1898 | return 0; |
1899 | } |
1900 | |
1901 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
1902 | |
1903 | static void iio_sanity_check_avail_scan_masks(struct iio_dev *indio_dev) |
1904 | { |
1905 | unsigned int num_masks, masklength, longs_per_mask; |
1906 | const unsigned long *av_masks; |
1907 | int i; |
1908 | |
1909 | av_masks = indio_dev->available_scan_masks; |
1910 | masklength = indio_dev->masklength; |
1911 | longs_per_mask = BITS_TO_LONGS(masklength); |
1912 | |
1913 | /* |
1914 | * The code determining how many available_scan_masks is in the array |
1915 | * will be assuming the end of masks when first long with all bits |
1916 | * zeroed is encountered. This is incorrect for masks where mask |
1917 | * consists of more than one long, and where some of the available masks |
1918 | * has long worth of bits zeroed (but has subsequent bit(s) set). This |
1919 | * is a safety measure against bug where array of masks is terminated by |
1920 | * a single zero while mask width is greater than width of a long. |
1921 | */ |
1922 | if (longs_per_mask > 1) |
1923 | dev_warn(indio_dev->dev.parent, |
1924 | "multi long available scan masks not fully supported\n" ); |
1925 | |
1926 | if (bitmap_empty(src: av_masks, nbits: masklength)) |
1927 | dev_warn(indio_dev->dev.parent, "empty scan mask\n" ); |
1928 | |
1929 | for (num_masks = 0; *av_masks; num_masks++) |
1930 | av_masks += longs_per_mask; |
1931 | |
1932 | if (num_masks < 2) |
1933 | return; |
1934 | |
1935 | av_masks = indio_dev->available_scan_masks; |
1936 | |
1937 | /* |
1938 | * Go through all the masks from first to one before the last, and see |
1939 | * that no mask found later from the available_scan_masks array is a |
1940 | * subset of mask found earlier. If this happens, then the mask found |
1941 | * later will never get used because scanning the array is stopped when |
1942 | * the first suitable mask is found. Drivers should order the array of |
1943 | * available masks in the order of preference (presumably the least |
1944 | * costy to access masks first). |
1945 | */ |
1946 | for (i = 0; i < num_masks - 1; i++) { |
1947 | const unsigned long *mask1; |
1948 | int j; |
1949 | |
1950 | mask1 = av_masks + i * longs_per_mask; |
1951 | for (j = i + 1; j < num_masks; j++) { |
1952 | const unsigned long *mask2; |
1953 | |
1954 | mask2 = av_masks + j * longs_per_mask; |
1955 | if (bitmap_subset(src1: mask2, src2: mask1, nbits: masklength)) |
1956 | dev_warn(indio_dev->dev.parent, |
1957 | "available_scan_mask %d subset of %d. Never used\n" , |
1958 | j, i); |
1959 | } |
1960 | } |
1961 | } |
1962 | |
1963 | int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod) |
1964 | { |
1965 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
1966 | struct fwnode_handle *fwnode = NULL; |
1967 | int ret; |
1968 | |
1969 | if (!indio_dev->info) |
1970 | return -EINVAL; |
1971 | |
1972 | iio_dev_opaque->driver_module = this_mod; |
1973 | |
1974 | /* If the calling driver did not initialize firmware node, do it here */ |
1975 | if (dev_fwnode(&indio_dev->dev)) |
1976 | fwnode = dev_fwnode(&indio_dev->dev); |
1977 | /* The default dummy IIO device has no parent */ |
1978 | else if (indio_dev->dev.parent) |
1979 | fwnode = dev_fwnode(indio_dev->dev.parent); |
1980 | device_set_node(dev: &indio_dev->dev, fwnode); |
1981 | |
1982 | fwnode_property_read_string(fwnode, propname: "label" , val: &indio_dev->label); |
1983 | |
1984 | ret = iio_check_unique_scan_index(indio_dev); |
1985 | if (ret < 0) |
1986 | return ret; |
1987 | |
1988 | ret = iio_check_extended_name(indio_dev); |
1989 | if (ret < 0) |
1990 | return ret; |
1991 | |
1992 | iio_device_register_debugfs(indio_dev); |
1993 | |
1994 | ret = iio_buffers_alloc_sysfs_and_mask(indio_dev); |
1995 | if (ret) { |
1996 | dev_err(indio_dev->dev.parent, |
1997 | "Failed to create buffer sysfs interfaces\n" ); |
1998 | goto error_unreg_debugfs; |
1999 | } |
2000 | |
2001 | if (indio_dev->available_scan_masks) |
2002 | iio_sanity_check_avail_scan_masks(indio_dev); |
2003 | |
2004 | ret = iio_device_register_sysfs(indio_dev); |
2005 | if (ret) { |
2006 | dev_err(indio_dev->dev.parent, |
2007 | "Failed to register sysfs interfaces\n" ); |
2008 | goto error_buffer_free_sysfs; |
2009 | } |
2010 | ret = iio_device_register_eventset(indio_dev); |
2011 | if (ret) { |
2012 | dev_err(indio_dev->dev.parent, |
2013 | "Failed to register event set\n" ); |
2014 | goto error_free_sysfs; |
2015 | } |
2016 | if (indio_dev->modes & INDIO_ALL_TRIGGERED_MODES) |
2017 | iio_device_register_trigger_consumer(indio_dev); |
2018 | |
2019 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
2020 | indio_dev->setup_ops == NULL) |
2021 | indio_dev->setup_ops = &noop_ring_setup_ops; |
2022 | |
2023 | if (iio_dev_opaque->attached_buffers_cnt) |
2024 | cdev_init(&iio_dev_opaque->chrdev, &iio_buffer_fileops); |
2025 | else if (iio_dev_opaque->event_interface) |
2026 | cdev_init(&iio_dev_opaque->chrdev, &iio_event_fileops); |
2027 | |
2028 | if (iio_dev_opaque->attached_buffers_cnt || iio_dev_opaque->event_interface) { |
2029 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), iio_dev_opaque->id); |
2030 | iio_dev_opaque->chrdev.owner = this_mod; |
2031 | } |
2032 | |
2033 | /* assign device groups now; they should be all registered now */ |
2034 | indio_dev->dev.groups = iio_dev_opaque->groups; |
2035 | |
2036 | ret = cdev_device_add(cdev: &iio_dev_opaque->chrdev, dev: &indio_dev->dev); |
2037 | if (ret < 0) |
2038 | goto error_unreg_eventset; |
2039 | |
2040 | return 0; |
2041 | |
2042 | error_unreg_eventset: |
2043 | iio_device_unregister_eventset(indio_dev); |
2044 | error_free_sysfs: |
2045 | iio_device_unregister_sysfs(indio_dev); |
2046 | error_buffer_free_sysfs: |
2047 | iio_buffers_free_sysfs_and_mask(indio_dev); |
2048 | error_unreg_debugfs: |
2049 | iio_device_unregister_debugfs(indio_dev); |
2050 | return ret; |
2051 | } |
2052 | EXPORT_SYMBOL(__iio_device_register); |
2053 | |
2054 | /** |
2055 | * iio_device_unregister() - unregister a device from the IIO subsystem |
2056 | * @indio_dev: Device structure representing the device. |
2057 | */ |
2058 | void iio_device_unregister(struct iio_dev *indio_dev) |
2059 | { |
2060 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
2061 | |
2062 | cdev_device_del(cdev: &iio_dev_opaque->chrdev, dev: &indio_dev->dev); |
2063 | |
2064 | mutex_lock(&iio_dev_opaque->info_exist_lock); |
2065 | |
2066 | iio_device_unregister_debugfs(indio_dev); |
2067 | |
2068 | iio_disable_all_buffers(indio_dev); |
2069 | |
2070 | indio_dev->info = NULL; |
2071 | |
2072 | iio_device_wakeup_eventset(indio_dev); |
2073 | iio_buffer_wakeup_poll(indio_dev); |
2074 | |
2075 | mutex_unlock(lock: &iio_dev_opaque->info_exist_lock); |
2076 | |
2077 | iio_buffers_free_sysfs_and_mask(indio_dev); |
2078 | } |
2079 | EXPORT_SYMBOL(iio_device_unregister); |
2080 | |
2081 | static void devm_iio_device_unreg(void *indio_dev) |
2082 | { |
2083 | iio_device_unregister(indio_dev); |
2084 | } |
2085 | |
2086 | int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev, |
2087 | struct module *this_mod) |
2088 | { |
2089 | int ret; |
2090 | |
2091 | ret = __iio_device_register(indio_dev, this_mod); |
2092 | if (ret) |
2093 | return ret; |
2094 | |
2095 | return devm_add_action_or_reset(dev, devm_iio_device_unreg, indio_dev); |
2096 | } |
2097 | EXPORT_SYMBOL_GPL(__devm_iio_device_register); |
2098 | |
2099 | /** |
2100 | * iio_device_claim_direct_mode - Keep device in direct mode |
2101 | * @indio_dev: the iio_dev associated with the device |
2102 | * |
2103 | * If the device is in direct mode it is guaranteed to stay |
2104 | * that way until iio_device_release_direct_mode() is called. |
2105 | * |
2106 | * Use with iio_device_release_direct_mode() |
2107 | * |
2108 | * Returns: 0 on success, -EBUSY on failure. |
2109 | */ |
2110 | int iio_device_claim_direct_mode(struct iio_dev *indio_dev) |
2111 | { |
2112 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
2113 | |
2114 | mutex_lock(&iio_dev_opaque->mlock); |
2115 | |
2116 | if (iio_buffer_enabled(indio_dev)) { |
2117 | mutex_unlock(lock: &iio_dev_opaque->mlock); |
2118 | return -EBUSY; |
2119 | } |
2120 | return 0; |
2121 | } |
2122 | EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode); |
2123 | |
2124 | /** |
2125 | * iio_device_release_direct_mode - releases claim on direct mode |
2126 | * @indio_dev: the iio_dev associated with the device |
2127 | * |
2128 | * Release the claim. Device is no longer guaranteed to stay |
2129 | * in direct mode. |
2130 | * |
2131 | * Use with iio_device_claim_direct_mode() |
2132 | */ |
2133 | void iio_device_release_direct_mode(struct iio_dev *indio_dev) |
2134 | { |
2135 | mutex_unlock(lock: &to_iio_dev_opaque(indio_dev)->mlock); |
2136 | } |
2137 | EXPORT_SYMBOL_GPL(iio_device_release_direct_mode); |
2138 | |
2139 | /** |
2140 | * iio_device_claim_buffer_mode - Keep device in buffer mode |
2141 | * @indio_dev: the iio_dev associated with the device |
2142 | * |
2143 | * If the device is in buffer mode it is guaranteed to stay |
2144 | * that way until iio_device_release_buffer_mode() is called. |
2145 | * |
2146 | * Use with iio_device_release_buffer_mode(). |
2147 | * |
2148 | * Returns: 0 on success, -EBUSY on failure. |
2149 | */ |
2150 | int iio_device_claim_buffer_mode(struct iio_dev *indio_dev) |
2151 | { |
2152 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
2153 | |
2154 | mutex_lock(&iio_dev_opaque->mlock); |
2155 | |
2156 | if (iio_buffer_enabled(indio_dev)) |
2157 | return 0; |
2158 | |
2159 | mutex_unlock(lock: &iio_dev_opaque->mlock); |
2160 | return -EBUSY; |
2161 | } |
2162 | EXPORT_SYMBOL_GPL(iio_device_claim_buffer_mode); |
2163 | |
2164 | /** |
2165 | * iio_device_release_buffer_mode - releases claim on buffer mode |
2166 | * @indio_dev: the iio_dev associated with the device |
2167 | * |
2168 | * Release the claim. Device is no longer guaranteed to stay |
2169 | * in buffer mode. |
2170 | * |
2171 | * Use with iio_device_claim_buffer_mode(). |
2172 | */ |
2173 | void iio_device_release_buffer_mode(struct iio_dev *indio_dev) |
2174 | { |
2175 | mutex_unlock(lock: &to_iio_dev_opaque(indio_dev)->mlock); |
2176 | } |
2177 | EXPORT_SYMBOL_GPL(iio_device_release_buffer_mode); |
2178 | |
2179 | /** |
2180 | * iio_device_get_current_mode() - helper function providing read-only access to |
2181 | * the opaque @currentmode variable |
2182 | * @indio_dev: IIO device structure for device |
2183 | */ |
2184 | int iio_device_get_current_mode(struct iio_dev *indio_dev) |
2185 | { |
2186 | struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); |
2187 | |
2188 | return iio_dev_opaque->currentmode; |
2189 | } |
2190 | EXPORT_SYMBOL_GPL(iio_device_get_current_mode); |
2191 | |
2192 | subsys_initcall(iio_init); |
2193 | module_exit(iio_exit); |
2194 | |
2195 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>" ); |
2196 | MODULE_DESCRIPTION("Industrial I/O core" ); |
2197 | MODULE_LICENSE("GPL" ); |
2198 | |