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Commit | Line | Data |
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847ec80b JC |
1 | /* The industrial I/O core |
2 | * | |
3 | * Copyright (c) 2008 Jonathan Cameron | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | * | |
9 | * Based on elements of hwmon and input subsystems. | |
10 | */ | |
11 | ||
3176dd5d SK |
12 | #define pr_fmt(fmt) "iio-core: " fmt |
13 | ||
847ec80b JC |
14 | #include <linux/kernel.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/idr.h> | |
17 | #include <linux/kdev_t.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/fs.h> | |
847ec80b | 21 | #include <linux/poll.h> |
ffc18afa | 22 | #include <linux/sched.h> |
4439c935 | 23 | #include <linux/wait.h> |
847ec80b | 24 | #include <linux/cdev.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
8e7d9672 | 26 | #include <linux/anon_inodes.h> |
e553f182 | 27 | #include <linux/debugfs.h> |
08a33805 | 28 | #include <linux/mutex.h> |
06458e27 | 29 | #include <linux/iio/iio.h> |
df9c1c42 | 30 | #include "iio_core.h" |
6aea1c36 | 31 | #include "iio_core_trigger.h" |
06458e27 JC |
32 | #include <linux/iio/sysfs.h> |
33 | #include <linux/iio/events.h> | |
9e69c935 | 34 | #include <linux/iio/buffer.h> |
33dd94cb | 35 | #include <linux/iio/buffer_impl.h> |
9dd1cb30 | 36 | |
99698b45 | 37 | /* IDA to assign each registered device a unique id */ |
b156cf70 | 38 | static DEFINE_IDA(iio_ida); |
847ec80b | 39 | |
f625cb97 | 40 | static dev_t iio_devt; |
847ec80b JC |
41 | |
42 | #define IIO_DEV_MAX 256 | |
5aaaeba8 | 43 | struct bus_type iio_bus_type = { |
847ec80b | 44 | .name = "iio", |
847ec80b | 45 | }; |
5aaaeba8 | 46 | EXPORT_SYMBOL(iio_bus_type); |
847ec80b | 47 | |
e553f182 MH |
48 | static struct dentry *iio_debugfs_dentry; |
49 | ||
c6fc8062 JC |
50 | static const char * const iio_direction[] = { |
51 | [0] = "in", | |
52 | [1] = "out", | |
53 | }; | |
54 | ||
ade7ef7b | 55 | static const char * const iio_chan_type_name_spec[] = { |
c6fc8062 | 56 | [IIO_VOLTAGE] = "voltage", |
faf290e8 MH |
57 | [IIO_CURRENT] = "current", |
58 | [IIO_POWER] = "power", | |
9bff02f8 | 59 | [IIO_ACCEL] = "accel", |
41ea040c | 60 | [IIO_ANGL_VEL] = "anglvel", |
1d892719 | 61 | [IIO_MAGN] = "magn", |
9bff02f8 BF |
62 | [IIO_LIGHT] = "illuminance", |
63 | [IIO_INTENSITY] = "intensity", | |
f09f2c81 | 64 | [IIO_PROXIMITY] = "proximity", |
9bff02f8 | 65 | [IIO_TEMP] = "temp", |
1d892719 JC |
66 | [IIO_INCLI] = "incli", |
67 | [IIO_ROT] = "rot", | |
1d892719 | 68 | [IIO_ANGL] = "angl", |
9bff02f8 | 69 | [IIO_TIMESTAMP] = "timestamp", |
66dbe704 | 70 | [IIO_CAPACITANCE] = "capacitance", |
a6b12855 | 71 | [IIO_ALTVOLTAGE] = "altvoltage", |
21cd1fab | 72 | [IIO_CCT] = "cct", |
c4f0c693 | 73 | [IIO_PRESSURE] = "pressure", |
ac216aa2 | 74 | [IIO_HUMIDITYRELATIVE] = "humidityrelative", |
55aebeb9 | 75 | [IIO_ACTIVITY] = "activity", |
a88bfe78 | 76 | [IIO_STEPS] = "steps", |
72c66644 | 77 | [IIO_ENERGY] = "energy", |
cc3c9eec | 78 | [IIO_DISTANCE] = "distance", |
5a1a9329 | 79 | [IIO_VELOCITY] = "velocity", |
8ff6b3bc | 80 | [IIO_CONCENTRATION] = "concentration", |
d38d5469 | 81 | [IIO_RESISTANCE] = "resistance", |
ecb3a7cc | 82 | [IIO_PH] = "ph", |
d409404c | 83 | [IIO_UVINDEX] = "uvindex", |
4b9d2090 | 84 | [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity", |
1a8f324a WBG |
85 | [IIO_COUNT] = "count", |
86 | [IIO_INDEX] = "index", | |
571299d0 | 87 | [IIO_GRAVITY] = "gravity", |
1d892719 JC |
88 | }; |
89 | ||
330c6c57 | 90 | static const char * const iio_modifier_names[] = { |
1d892719 JC |
91 | [IIO_MOD_X] = "x", |
92 | [IIO_MOD_Y] = "y", | |
93 | [IIO_MOD_Z] = "z", | |
4b8d8015 PM |
94 | [IIO_MOD_X_AND_Y] = "x&y", |
95 | [IIO_MOD_X_AND_Z] = "x&z", | |
96 | [IIO_MOD_Y_AND_Z] = "y&z", | |
97 | [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z", | |
98 | [IIO_MOD_X_OR_Y] = "x|y", | |
99 | [IIO_MOD_X_OR_Z] = "x|z", | |
100 | [IIO_MOD_Y_OR_Z] = "y|z", | |
101 | [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z", | |
8f5879b2 | 102 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", |
cf82cb81 | 103 | [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", |
330c6c57 JC |
104 | [IIO_MOD_LIGHT_BOTH] = "both", |
105 | [IIO_MOD_LIGHT_IR] = "ir", | |
21cd1fab JB |
106 | [IIO_MOD_LIGHT_CLEAR] = "clear", |
107 | [IIO_MOD_LIGHT_RED] = "red", | |
108 | [IIO_MOD_LIGHT_GREEN] = "green", | |
109 | [IIO_MOD_LIGHT_BLUE] = "blue", | |
2c5ff1f9 | 110 | [IIO_MOD_LIGHT_UV] = "uv", |
5082f405 | 111 | [IIO_MOD_QUATERNION] = "quaternion", |
638b43b3 PM |
112 | [IIO_MOD_TEMP_AMBIENT] = "ambient", |
113 | [IIO_MOD_TEMP_OBJECT] = "object", | |
11b8ddab RA |
114 | [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", |
115 | [IIO_MOD_NORTH_TRUE] = "from_north_true", | |
116 | [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", | |
117 | [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", | |
55aebeb9 DB |
118 | [IIO_MOD_RUNNING] = "running", |
119 | [IIO_MOD_JOGGING] = "jogging", | |
120 | [IIO_MOD_WALKING] = "walking", | |
121 | [IIO_MOD_STILL] = "still", | |
5a1a9329 | 122 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", |
1ce87f21 LPC |
123 | [IIO_MOD_I] = "i", |
124 | [IIO_MOD_Q] = "q", | |
8ff6b3bc MR |
125 | [IIO_MOD_CO2] = "co2", |
126 | [IIO_MOD_VOC] = "voc", | |
1d892719 JC |
127 | }; |
128 | ||
129 | /* relies on pairs of these shared then separate */ | |
130 | static const char * const iio_chan_info_postfix[] = { | |
75a973c7 JC |
131 | [IIO_CHAN_INFO_RAW] = "raw", |
132 | [IIO_CHAN_INFO_PROCESSED] = "input", | |
c8a9f805 JC |
133 | [IIO_CHAN_INFO_SCALE] = "scale", |
134 | [IIO_CHAN_INFO_OFFSET] = "offset", | |
135 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", | |
136 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", | |
137 | [IIO_CHAN_INFO_PEAK] = "peak_raw", | |
138 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", | |
139 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", | |
140 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", | |
df94aba8 JC |
141 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
142 | = "filter_low_pass_3db_frequency", | |
3f7f642b MF |
143 | [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY] |
144 | = "filter_high_pass_3db_frequency", | |
ce85a1cb | 145 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", |
a6b12855 MH |
146 | [IIO_CHAN_INFO_FREQUENCY] = "frequency", |
147 | [IIO_CHAN_INFO_PHASE] = "phase", | |
b65d6212 | 148 | [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", |
7c9ab035 | 149 | [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", |
899d90bd | 150 | [IIO_CHAN_INFO_INT_TIME] = "integration_time", |
a88bfe78 | 151 | [IIO_CHAN_INFO_ENABLE] = "en", |
bcdf28fb | 152 | [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight", |
d37f6836 | 153 | [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight", |
2f0ecb7c IT |
154 | [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count", |
155 | [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time", | |
c8a85854 | 156 | [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity", |
faaa4495 | 157 | [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio", |
1d892719 JC |
158 | }; |
159 | ||
a7e57dce SK |
160 | /** |
161 | * iio_find_channel_from_si() - get channel from its scan index | |
162 | * @indio_dev: device | |
163 | * @si: scan index to match | |
164 | */ | |
5fb21c82 JC |
165 | const struct iio_chan_spec |
166 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) | |
167 | { | |
168 | int i; | |
169 | ||
170 | for (i = 0; i < indio_dev->num_channels; i++) | |
171 | if (indio_dev->channels[i].scan_index == si) | |
172 | return &indio_dev->channels[i]; | |
173 | return NULL; | |
174 | } | |
175 | ||
847ec80b JC |
176 | /* This turns up an awful lot */ |
177 | ssize_t iio_read_const_attr(struct device *dev, | |
178 | struct device_attribute *attr, | |
179 | char *buf) | |
180 | { | |
181 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
182 | } | |
183 | EXPORT_SYMBOL(iio_read_const_attr); | |
184 | ||
bc2b7dab GB |
185 | static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id) |
186 | { | |
187 | int ret; | |
188 | const struct iio_event_interface *ev_int = indio_dev->event_interface; | |
189 | ||
190 | ret = mutex_lock_interruptible(&indio_dev->mlock); | |
191 | if (ret) | |
192 | return ret; | |
193 | if ((ev_int && iio_event_enabled(ev_int)) || | |
194 | iio_buffer_enabled(indio_dev)) { | |
195 | mutex_unlock(&indio_dev->mlock); | |
196 | return -EBUSY; | |
197 | } | |
198 | indio_dev->clock_id = clock_id; | |
199 | mutex_unlock(&indio_dev->mlock); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | /** | |
205 | * iio_get_time_ns() - utility function to get a time stamp for events etc | |
206 | * @indio_dev: device | |
207 | */ | |
208 | s64 iio_get_time_ns(const struct iio_dev *indio_dev) | |
209 | { | |
210 | struct timespec tp; | |
211 | ||
212 | switch (iio_device_get_clock(indio_dev)) { | |
213 | case CLOCK_REALTIME: | |
214 | ktime_get_real_ts(&tp); | |
215 | break; | |
216 | case CLOCK_MONOTONIC: | |
217 | ktime_get_ts(&tp); | |
218 | break; | |
219 | case CLOCK_MONOTONIC_RAW: | |
220 | getrawmonotonic(&tp); | |
221 | break; | |
222 | case CLOCK_REALTIME_COARSE: | |
223 | tp = current_kernel_time(); | |
224 | break; | |
225 | case CLOCK_MONOTONIC_COARSE: | |
226 | tp = get_monotonic_coarse(); | |
227 | break; | |
228 | case CLOCK_BOOTTIME: | |
229 | get_monotonic_boottime(&tp); | |
230 | break; | |
231 | case CLOCK_TAI: | |
232 | timekeeping_clocktai(&tp); | |
233 | break; | |
234 | default: | |
235 | BUG(); | |
236 | } | |
237 | ||
238 | return timespec_to_ns(&tp); | |
239 | } | |
240 | EXPORT_SYMBOL(iio_get_time_ns); | |
241 | ||
242 | /** | |
243 | * iio_get_time_res() - utility function to get time stamp clock resolution in | |
244 | * nano seconds. | |
245 | * @indio_dev: device | |
246 | */ | |
247 | unsigned int iio_get_time_res(const struct iio_dev *indio_dev) | |
248 | { | |
249 | switch (iio_device_get_clock(indio_dev)) { | |
250 | case CLOCK_REALTIME: | |
251 | case CLOCK_MONOTONIC: | |
252 | case CLOCK_MONOTONIC_RAW: | |
253 | case CLOCK_BOOTTIME: | |
254 | case CLOCK_TAI: | |
255 | return hrtimer_resolution; | |
256 | case CLOCK_REALTIME_COARSE: | |
257 | case CLOCK_MONOTONIC_COARSE: | |
258 | return LOW_RES_NSEC; | |
259 | default: | |
260 | BUG(); | |
261 | } | |
262 | } | |
263 | EXPORT_SYMBOL(iio_get_time_res); | |
264 | ||
847ec80b JC |
265 | static int __init iio_init(void) |
266 | { | |
267 | int ret; | |
268 | ||
5aaaeba8 JC |
269 | /* Register sysfs bus */ |
270 | ret = bus_register(&iio_bus_type); | |
847ec80b | 271 | if (ret < 0) { |
3176dd5d | 272 | pr_err("could not register bus type\n"); |
847ec80b JC |
273 | goto error_nothing; |
274 | } | |
275 | ||
9aa1a167 JC |
276 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
277 | if (ret < 0) { | |
3176dd5d | 278 | pr_err("failed to allocate char dev region\n"); |
5aaaeba8 | 279 | goto error_unregister_bus_type; |
9aa1a167 | 280 | } |
847ec80b | 281 | |
e553f182 MH |
282 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
283 | ||
847ec80b JC |
284 | return 0; |
285 | ||
5aaaeba8 JC |
286 | error_unregister_bus_type: |
287 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
288 | error_nothing: |
289 | return ret; | |
290 | } | |
291 | ||
292 | static void __exit iio_exit(void) | |
293 | { | |
9aa1a167 JC |
294 | if (iio_devt) |
295 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 296 | bus_unregister(&iio_bus_type); |
e553f182 MH |
297 | debugfs_remove(iio_debugfs_dentry); |
298 | } | |
299 | ||
300 | #if defined(CONFIG_DEBUG_FS) | |
e553f182 MH |
301 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
302 | size_t count, loff_t *ppos) | |
303 | { | |
304 | struct iio_dev *indio_dev = file->private_data; | |
305 | char buf[20]; | |
306 | unsigned val = 0; | |
307 | ssize_t len; | |
308 | int ret; | |
309 | ||
310 | ret = indio_dev->info->debugfs_reg_access(indio_dev, | |
311 | indio_dev->cached_reg_addr, | |
312 | 0, &val); | |
313 | if (ret) | |
314 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); | |
315 | ||
316 | len = snprintf(buf, sizeof(buf), "0x%X\n", val); | |
317 | ||
318 | return simple_read_from_buffer(userbuf, count, ppos, buf, len); | |
319 | } | |
320 | ||
321 | static ssize_t iio_debugfs_write_reg(struct file *file, | |
322 | const char __user *userbuf, size_t count, loff_t *ppos) | |
323 | { | |
324 | struct iio_dev *indio_dev = file->private_data; | |
325 | unsigned reg, val; | |
326 | char buf[80]; | |
327 | int ret; | |
328 | ||
329 | count = min_t(size_t, count, (sizeof(buf)-1)); | |
330 | if (copy_from_user(buf, userbuf, count)) | |
331 | return -EFAULT; | |
332 | ||
333 | buf[count] = 0; | |
334 | ||
335 | ret = sscanf(buf, "%i %i", ®, &val); | |
336 | ||
337 | switch (ret) { | |
338 | case 1: | |
339 | indio_dev->cached_reg_addr = reg; | |
340 | break; | |
341 | case 2: | |
342 | indio_dev->cached_reg_addr = reg; | |
343 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, | |
344 | val, NULL); | |
345 | if (ret) { | |
346 | dev_err(indio_dev->dev.parent, "%s: write failed\n", | |
347 | __func__); | |
348 | return ret; | |
349 | } | |
350 | break; | |
351 | default: | |
352 | return -EINVAL; | |
353 | } | |
354 | ||
355 | return count; | |
356 | } | |
357 | ||
358 | static const struct file_operations iio_debugfs_reg_fops = { | |
5a28c873 | 359 | .open = simple_open, |
e553f182 MH |
360 | .read = iio_debugfs_read_reg, |
361 | .write = iio_debugfs_write_reg, | |
362 | }; | |
363 | ||
364 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
365 | { | |
366 | debugfs_remove_recursive(indio_dev->debugfs_dentry); | |
847ec80b JC |
367 | } |
368 | ||
e553f182 MH |
369 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
370 | { | |
371 | struct dentry *d; | |
372 | ||
373 | if (indio_dev->info->debugfs_reg_access == NULL) | |
374 | return 0; | |
375 | ||
abd5a2fb | 376 | if (!iio_debugfs_dentry) |
e553f182 MH |
377 | return 0; |
378 | ||
379 | indio_dev->debugfs_dentry = | |
380 | debugfs_create_dir(dev_name(&indio_dev->dev), | |
381 | iio_debugfs_dentry); | |
e553f182 MH |
382 | if (indio_dev->debugfs_dentry == NULL) { |
383 | dev_warn(indio_dev->dev.parent, | |
384 | "Failed to create debugfs directory\n"); | |
385 | return -EFAULT; | |
386 | } | |
387 | ||
388 | d = debugfs_create_file("direct_reg_access", 0644, | |
389 | indio_dev->debugfs_dentry, | |
390 | indio_dev, &iio_debugfs_reg_fops); | |
391 | if (!d) { | |
392 | iio_device_unregister_debugfs(indio_dev); | |
393 | return -ENOMEM; | |
394 | } | |
395 | ||
396 | return 0; | |
397 | } | |
398 | #else | |
399 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) | |
400 | { | |
401 | return 0; | |
402 | } | |
403 | ||
404 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
405 | { | |
406 | } | |
407 | #endif /* CONFIG_DEBUG_FS */ | |
408 | ||
4fee7e16 LPC |
409 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
410 | struct device_attribute *attr, | |
411 | char *buf) | |
412 | { | |
e53f5ac5 | 413 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
414 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
415 | const struct iio_chan_spec_ext_info *ext_info; | |
416 | ||
417 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
418 | ||
fc6d1139 | 419 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
4fee7e16 LPC |
420 | } |
421 | ||
422 | static ssize_t iio_write_channel_ext_info(struct device *dev, | |
423 | struct device_attribute *attr, | |
424 | const char *buf, | |
425 | size_t len) | |
426 | { | |
e53f5ac5 | 427 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
428 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
429 | const struct iio_chan_spec_ext_info *ext_info; | |
430 | ||
431 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
432 | ||
fc6d1139 MH |
433 | return ext_info->write(indio_dev, ext_info->private, |
434 | this_attr->c, buf, len); | |
4fee7e16 LPC |
435 | } |
436 | ||
5212cc8a LPC |
437 | ssize_t iio_enum_available_read(struct iio_dev *indio_dev, |
438 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
439 | { | |
440 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
441 | unsigned int i; | |
442 | size_t len = 0; | |
443 | ||
444 | if (!e->num_items) | |
445 | return 0; | |
446 | ||
447 | for (i = 0; i < e->num_items; ++i) | |
74dcd439 | 448 | len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); |
5212cc8a LPC |
449 | |
450 | /* replace last space with a newline */ | |
451 | buf[len - 1] = '\n'; | |
452 | ||
453 | return len; | |
454 | } | |
455 | EXPORT_SYMBOL_GPL(iio_enum_available_read); | |
456 | ||
457 | ssize_t iio_enum_read(struct iio_dev *indio_dev, | |
458 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
459 | { | |
460 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
461 | int i; | |
462 | ||
463 | if (!e->get) | |
464 | return -EINVAL; | |
465 | ||
466 | i = e->get(indio_dev, chan); | |
467 | if (i < 0) | |
468 | return i; | |
469 | else if (i >= e->num_items) | |
470 | return -EINVAL; | |
471 | ||
598db581 | 472 | return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]); |
5212cc8a LPC |
473 | } |
474 | EXPORT_SYMBOL_GPL(iio_enum_read); | |
475 | ||
476 | ssize_t iio_enum_write(struct iio_dev *indio_dev, | |
477 | uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, | |
478 | size_t len) | |
479 | { | |
480 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
481 | unsigned int i; | |
482 | int ret; | |
483 | ||
484 | if (!e->set) | |
485 | return -EINVAL; | |
486 | ||
487 | for (i = 0; i < e->num_items; i++) { | |
488 | if (sysfs_streq(buf, e->items[i])) | |
489 | break; | |
490 | } | |
491 | ||
492 | if (i == e->num_items) | |
493 | return -EINVAL; | |
494 | ||
495 | ret = e->set(indio_dev, chan, i); | |
496 | return ret ? ret : len; | |
497 | } | |
498 | EXPORT_SYMBOL_GPL(iio_enum_write); | |
499 | ||
dfc57732 GB |
500 | static const struct iio_mount_matrix iio_mount_idmatrix = { |
501 | .rotation = { | |
502 | "1", "0", "0", | |
503 | "0", "1", "0", | |
504 | "0", "0", "1" | |
505 | } | |
506 | }; | |
507 | ||
508 | static int iio_setup_mount_idmatrix(const struct device *dev, | |
509 | struct iio_mount_matrix *matrix) | |
510 | { | |
511 | *matrix = iio_mount_idmatrix; | |
512 | dev_info(dev, "mounting matrix not found: using identity...\n"); | |
513 | return 0; | |
514 | } | |
515 | ||
516 | ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv, | |
517 | const struct iio_chan_spec *chan, char *buf) | |
518 | { | |
519 | const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *) | |
520 | priv)(indio_dev, chan); | |
521 | ||
522 | if (IS_ERR(mtx)) | |
523 | return PTR_ERR(mtx); | |
524 | ||
525 | if (!mtx) | |
526 | mtx = &iio_mount_idmatrix; | |
527 | ||
528 | return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n", | |
529 | mtx->rotation[0], mtx->rotation[1], mtx->rotation[2], | |
530 | mtx->rotation[3], mtx->rotation[4], mtx->rotation[5], | |
531 | mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]); | |
532 | } | |
533 | EXPORT_SYMBOL_GPL(iio_show_mount_matrix); | |
534 | ||
535 | /** | |
536 | * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from | |
537 | * device-tree "mount-matrix" property | |
538 | * @dev: device the mounting matrix property is assigned to | |
539 | * @propname: device specific mounting matrix property name | |
540 | * @matrix: where to store retrieved matrix | |
541 | * | |
542 | * If device is assigned no mounting matrix property, a default 3x3 identity | |
543 | * matrix will be filled in. | |
544 | * | |
545 | * Return: 0 if success, or a negative error code on failure. | |
546 | */ | |
547 | #ifdef CONFIG_OF | |
548 | int of_iio_read_mount_matrix(const struct device *dev, | |
549 | const char *propname, | |
550 | struct iio_mount_matrix *matrix) | |
551 | { | |
552 | if (dev->of_node) { | |
553 | int err = of_property_read_string_array(dev->of_node, | |
554 | propname, matrix->rotation, | |
555 | ARRAY_SIZE(iio_mount_idmatrix.rotation)); | |
556 | ||
557 | if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation)) | |
558 | return 0; | |
559 | ||
560 | if (err >= 0) | |
561 | /* Invalid number of matrix entries. */ | |
562 | return -EINVAL; | |
563 | ||
564 | if (err != -EINVAL) | |
565 | /* Invalid matrix declaration format. */ | |
566 | return err; | |
567 | } | |
568 | ||
569 | /* Matrix was not declared at all: fallback to identity. */ | |
570 | return iio_setup_mount_idmatrix(dev, matrix); | |
571 | } | |
572 | #else | |
573 | int of_iio_read_mount_matrix(const struct device *dev, | |
574 | const char *propname, | |
575 | struct iio_mount_matrix *matrix) | |
576 | { | |
577 | return iio_setup_mount_idmatrix(dev, matrix); | |
578 | } | |
579 | #endif | |
580 | EXPORT_SYMBOL(of_iio_read_mount_matrix); | |
581 | ||
51239600 JC |
582 | static ssize_t __iio_format_value(char *buf, size_t len, unsigned int type, |
583 | int size, const int *vals) | |
847ec80b | 584 | { |
7985e7c1 | 585 | unsigned long long tmp; |
51239600 | 586 | int tmp0, tmp1; |
67eedba3 | 587 | bool scale_db = false; |
1d892719 | 588 | |
3661f3f5 | 589 | switch (type) { |
67eedba3 | 590 | case IIO_VAL_INT: |
51239600 | 591 | return snprintf(buf, len, "%d", vals[0]); |
67eedba3 MH |
592 | case IIO_VAL_INT_PLUS_MICRO_DB: |
593 | scale_db = true; | |
594 | case IIO_VAL_INT_PLUS_MICRO: | |
9fbfb4b3 | 595 | if (vals[1] < 0) |
51239600 JC |
596 | return snprintf(buf, len, "-%d.%06u%s", abs(vals[0]), |
597 | -vals[1], scale_db ? " dB" : ""); | |
1d892719 | 598 | else |
51239600 JC |
599 | return snprintf(buf, len, "%d.%06u%s", vals[0], vals[1], |
600 | scale_db ? " dB" : ""); | |
67eedba3 | 601 | case IIO_VAL_INT_PLUS_NANO: |
9fbfb4b3 | 602 | if (vals[1] < 0) |
51239600 JC |
603 | return snprintf(buf, len, "-%d.%09u", abs(vals[0]), |
604 | -vals[1]); | |
71646e2c | 605 | else |
51239600 | 606 | return snprintf(buf, len, "%d.%09u", vals[0], vals[1]); |
7985e7c1 | 607 | case IIO_VAL_FRACTIONAL: |
9fbfb4b3 | 608 | tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]); |
51239600 JC |
609 | tmp1 = vals[1]; |
610 | tmp0 = (int)div_s64_rem(tmp, 1000000000, &tmp1); | |
611 | return snprintf(buf, len, "%d.%09u", tmp0, abs(tmp1)); | |
103d9fb9 | 612 | case IIO_VAL_FRACTIONAL_LOG2: |
9fbfb4b3 | 613 | tmp = (s64)vals[0] * 1000000000LL >> vals[1]; |
51239600 JC |
614 | tmp1 = do_div(tmp, 1000000000LL); |
615 | tmp0 = tmp; | |
616 | return snprintf(buf, len, "%d.%09u", tmp0, tmp1); | |
9fbfb4b3 SP |
617 | case IIO_VAL_INT_MULTIPLE: |
618 | { | |
619 | int i; | |
51239600 | 620 | int l = 0; |
9fbfb4b3 | 621 | |
51239600 JC |
622 | for (i = 0; i < size; ++i) { |
623 | l += snprintf(&buf[l], len - l, "%d ", vals[i]); | |
624 | if (l >= len) | |
625 | break; | |
626 | } | |
627 | return l; | |
9fbfb4b3 | 628 | } |
67eedba3 | 629 | default: |
1d892719 | 630 | return 0; |
67eedba3 | 631 | } |
1d892719 | 632 | } |
51239600 JC |
633 | |
634 | /** | |
635 | * iio_format_value() - Formats a IIO value into its string representation | |
636 | * @buf: The buffer to which the formatted value gets written | |
637 | * which is assumed to be big enough (i.e. PAGE_SIZE). | |
638 | * @type: One of the IIO_VAL_... constants. This decides how the val | |
639 | * and val2 parameters are formatted. | |
640 | * @size: Number of IIO value entries contained in vals | |
641 | * @vals: Pointer to the values, exact meaning depends on the | |
642 | * type parameter. | |
643 | * | |
644 | * Return: 0 by default, a negative number on failure or the | |
645 | * total number of characters written for a type that belongs | |
646 | * to the IIO_VAL_... constant. | |
647 | */ | |
648 | ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) | |
649 | { | |
650 | ssize_t len; | |
651 | ||
652 | len = __iio_format_value(buf, PAGE_SIZE, type, size, vals); | |
653 | if (len >= PAGE_SIZE - 1) | |
654 | return -EFBIG; | |
655 | ||
656 | return len + sprintf(buf + len, "\n"); | |
657 | } | |
7d2c2aca | 658 | EXPORT_SYMBOL_GPL(iio_format_value); |
1d892719 | 659 | |
3661f3f5 LPC |
660 | static ssize_t iio_read_channel_info(struct device *dev, |
661 | struct device_attribute *attr, | |
662 | char *buf) | |
663 | { | |
664 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
665 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
9fbfb4b3 SP |
666 | int vals[INDIO_MAX_RAW_ELEMENTS]; |
667 | int ret; | |
668 | int val_len = 2; | |
669 | ||
670 | if (indio_dev->info->read_raw_multi) | |
671 | ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c, | |
672 | INDIO_MAX_RAW_ELEMENTS, | |
673 | vals, &val_len, | |
674 | this_attr->address); | |
675 | else | |
676 | ret = indio_dev->info->read_raw(indio_dev, this_attr->c, | |
677 | &vals[0], &vals[1], this_attr->address); | |
3661f3f5 LPC |
678 | |
679 | if (ret < 0) | |
680 | return ret; | |
681 | ||
9fbfb4b3 | 682 | return iio_format_value(buf, ret, val_len, vals); |
3661f3f5 LPC |
683 | } |
684 | ||
51239600 JC |
685 | static ssize_t iio_format_avail_list(char *buf, const int *vals, |
686 | int type, int length) | |
687 | { | |
688 | int i; | |
689 | ssize_t len = 0; | |
690 | ||
691 | switch (type) { | |
692 | case IIO_VAL_INT: | |
693 | for (i = 0; i < length; i++) { | |
694 | len += __iio_format_value(buf + len, PAGE_SIZE - len, | |
695 | type, 1, &vals[i]); | |
696 | if (len >= PAGE_SIZE) | |
697 | return -EFBIG; | |
698 | if (i < length - 1) | |
699 | len += snprintf(buf + len, PAGE_SIZE - len, | |
700 | " "); | |
701 | else | |
702 | len += snprintf(buf + len, PAGE_SIZE - len, | |
703 | "\n"); | |
704 | if (len >= PAGE_SIZE) | |
705 | return -EFBIG; | |
706 | } | |
707 | break; | |
708 | default: | |
709 | for (i = 0; i < length / 2; i++) { | |
710 | len += __iio_format_value(buf + len, PAGE_SIZE - len, | |
711 | type, 2, &vals[i * 2]); | |
712 | if (len >= PAGE_SIZE) | |
713 | return -EFBIG; | |
714 | if (i < length / 2 - 1) | |
715 | len += snprintf(buf + len, PAGE_SIZE - len, | |
716 | " "); | |
717 | else | |
718 | len += snprintf(buf + len, PAGE_SIZE - len, | |
719 | "\n"); | |
720 | if (len >= PAGE_SIZE) | |
721 | return -EFBIG; | |
722 | } | |
723 | } | |
724 | ||
725 | return len; | |
726 | } | |
727 | ||
728 | static ssize_t iio_format_avail_range(char *buf, const int *vals, int type) | |
729 | { | |
730 | int i; | |
731 | ssize_t len; | |
732 | ||
733 | len = snprintf(buf, PAGE_SIZE, "["); | |
734 | switch (type) { | |
735 | case IIO_VAL_INT: | |
736 | for (i = 0; i < 3; i++) { | |
737 | len += __iio_format_value(buf + len, PAGE_SIZE - len, | |
738 | type, 1, &vals[i]); | |
739 | if (len >= PAGE_SIZE) | |
740 | return -EFBIG; | |
741 | if (i < 2) | |
742 | len += snprintf(buf + len, PAGE_SIZE - len, | |
743 | " "); | |
744 | else | |
745 | len += snprintf(buf + len, PAGE_SIZE - len, | |
746 | "]\n"); | |
747 | if (len >= PAGE_SIZE) | |
748 | return -EFBIG; | |
749 | } | |
750 | break; | |
751 | default: | |
752 | for (i = 0; i < 3; i++) { | |
753 | len += __iio_format_value(buf + len, PAGE_SIZE - len, | |
754 | type, 2, &vals[i * 2]); | |
755 | if (len >= PAGE_SIZE) | |
756 | return -EFBIG; | |
757 | if (i < 2) | |
758 | len += snprintf(buf + len, PAGE_SIZE - len, | |
759 | " "); | |
760 | else | |
761 | len += snprintf(buf + len, PAGE_SIZE - len, | |
762 | "]\n"); | |
763 | if (len >= PAGE_SIZE) | |
764 | return -EFBIG; | |
765 | } | |
766 | } | |
767 | ||
768 | return len; | |
769 | } | |
770 | ||
771 | static ssize_t iio_read_channel_info_avail(struct device *dev, | |
772 | struct device_attribute *attr, | |
773 | char *buf) | |
774 | { | |
775 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
776 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
777 | const int *vals; | |
778 | int ret; | |
779 | int length; | |
780 | int type; | |
781 | ||
782 | ret = indio_dev->info->read_avail(indio_dev, this_attr->c, | |
783 | &vals, &type, &length, | |
784 | this_attr->address); | |
785 | ||
786 | if (ret < 0) | |
787 | return ret; | |
788 | switch (ret) { | |
789 | case IIO_AVAIL_LIST: | |
790 | return iio_format_avail_list(buf, vals, type, length); | |
791 | case IIO_AVAIL_RANGE: | |
792 | return iio_format_avail_range(buf, vals, type); | |
793 | default: | |
794 | return -EINVAL; | |
795 | } | |
796 | } | |
797 | ||
6807d721 LPC |
798 | /** |
799 | * iio_str_to_fixpoint() - Parse a fixed-point number from a string | |
800 | * @str: The string to parse | |
801 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 | |
802 | * @integer: The integer part of the number | |
803 | * @fract: The fractional part of the number | |
804 | * | |
805 | * Returns 0 on success, or a negative error code if the string could not be | |
806 | * parsed. | |
807 | */ | |
808 | int iio_str_to_fixpoint(const char *str, int fract_mult, | |
809 | int *integer, int *fract) | |
810 | { | |
811 | int i = 0, f = 0; | |
812 | bool integer_part = true, negative = false; | |
813 | ||
f47dff32 SN |
814 | if (fract_mult == 0) { |
815 | *fract = 0; | |
816 | ||
817 | return kstrtoint(str, 0, integer); | |
818 | } | |
819 | ||
6807d721 LPC |
820 | if (str[0] == '-') { |
821 | negative = true; | |
822 | str++; | |
823 | } else if (str[0] == '+') { | |
824 | str++; | |
825 | } | |
826 | ||
827 | while (*str) { | |
828 | if ('0' <= *str && *str <= '9') { | |
829 | if (integer_part) { | |
830 | i = i * 10 + *str - '0'; | |
831 | } else { | |
832 | f += fract_mult * (*str - '0'); | |
833 | fract_mult /= 10; | |
834 | } | |
835 | } else if (*str == '\n') { | |
836 | if (*(str + 1) == '\0') | |
837 | break; | |
838 | else | |
839 | return -EINVAL; | |
840 | } else if (*str == '.' && integer_part) { | |
841 | integer_part = false; | |
842 | } else { | |
843 | return -EINVAL; | |
844 | } | |
845 | str++; | |
846 | } | |
847 | ||
848 | if (negative) { | |
849 | if (i) | |
850 | i = -i; | |
851 | else | |
852 | f = -f; | |
853 | } | |
854 | ||
855 | *integer = i; | |
856 | *fract = f; | |
857 | ||
858 | return 0; | |
859 | } | |
860 | EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); | |
861 | ||
1d892719 JC |
862 | static ssize_t iio_write_channel_info(struct device *dev, |
863 | struct device_attribute *attr, | |
864 | const char *buf, | |
865 | size_t len) | |
866 | { | |
e53f5ac5 | 867 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719 | 868 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
6807d721 LPC |
869 | int ret, fract_mult = 100000; |
870 | int integer, fract; | |
1d892719 JC |
871 | |
872 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 873 | if (!indio_dev->info->write_raw) |
1d892719 | 874 | return -EINVAL; |
5c04af04 MH |
875 | |
876 | if (indio_dev->info->write_raw_get_fmt) | |
877 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, | |
878 | this_attr->c, this_attr->address)) { | |
f47dff32 SN |
879 | case IIO_VAL_INT: |
880 | fract_mult = 0; | |
881 | break; | |
5c04af04 MH |
882 | case IIO_VAL_INT_PLUS_MICRO: |
883 | fract_mult = 100000; | |
884 | break; | |
885 | case IIO_VAL_INT_PLUS_NANO: | |
886 | fract_mult = 100000000; | |
887 | break; | |
888 | default: | |
889 | return -EINVAL; | |
890 | } | |
891 | ||
6807d721 LPC |
892 | ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract); |
893 | if (ret) | |
894 | return ret; | |
1d892719 | 895 | |
6fe8135f | 896 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 897 | integer, fract, this_attr->address); |
1d892719 JC |
898 | if (ret) |
899 | return ret; | |
900 | ||
901 | return len; | |
902 | } | |
903 | ||
df9c1c42 | 904 | static |
1d892719 JC |
905 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
906 | const char *postfix, | |
907 | struct iio_chan_spec const *chan, | |
908 | ssize_t (*readfunc)(struct device *dev, | |
909 | struct device_attribute *attr, | |
910 | char *buf), | |
911 | ssize_t (*writefunc)(struct device *dev, | |
912 | struct device_attribute *attr, | |
913 | const char *buf, | |
914 | size_t len), | |
3704432f | 915 | enum iio_shared_by shared_by) |
1d892719 | 916 | { |
3704432f | 917 | int ret = 0; |
7bbcf7e1 | 918 | char *name = NULL; |
3704432f | 919 | char *full_postfix; |
1d892719 | 920 | sysfs_attr_init(&dev_attr->attr); |
1d892719 | 921 | |
ade7ef7b | 922 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
3704432f | 923 | if (chan->modified && (shared_by == IIO_SEPARATE)) { |
ade7ef7b JC |
924 | if (chan->extend_name) |
925 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
926 | iio_modifier_names[chan | |
927 | ->channel2], | |
928 | chan->extend_name, | |
929 | postfix); | |
930 | else | |
931 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
932 | iio_modifier_names[chan | |
933 | ->channel2], | |
934 | postfix); | |
935 | } else { | |
77bfa8ba | 936 | if (chan->extend_name == NULL || shared_by != IIO_SEPARATE) |
ade7ef7b JC |
937 | full_postfix = kstrdup(postfix, GFP_KERNEL); |
938 | else | |
939 | full_postfix = kasprintf(GFP_KERNEL, | |
940 | "%s_%s", | |
941 | chan->extend_name, | |
942 | postfix); | |
943 | } | |
3704432f JC |
944 | if (full_postfix == NULL) |
945 | return -ENOMEM; | |
1d892719 | 946 | |
4abf6f8b | 947 | if (chan->differential) { /* Differential can not have modifier */ |
3704432f | 948 | switch (shared_by) { |
c006ec83 | 949 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 950 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
951 | break; |
952 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 953 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
954 | iio_direction[chan->output], |
955 | full_postfix); | |
956 | break; | |
3704432f | 957 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 958 | name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", |
ade7ef7b JC |
959 | iio_direction[chan->output], |
960 | iio_chan_type_name_spec[chan->type], | |
961 | iio_chan_type_name_spec[chan->type], | |
962 | full_postfix); | |
3704432f JC |
963 | break; |
964 | case IIO_SEPARATE: | |
965 | if (!chan->indexed) { | |
231bfe53 | 966 | WARN(1, "Differential channels must be indexed\n"); |
3704432f JC |
967 | ret = -EINVAL; |
968 | goto error_free_full_postfix; | |
969 | } | |
7bbcf7e1 | 970 | name = kasprintf(GFP_KERNEL, |
3704432f | 971 | "%s_%s%d-%s%d_%s", |
ade7ef7b JC |
972 | iio_direction[chan->output], |
973 | iio_chan_type_name_spec[chan->type], | |
974 | chan->channel, | |
975 | iio_chan_type_name_spec[chan->type], | |
976 | chan->channel2, | |
977 | full_postfix); | |
3704432f | 978 | break; |
ade7ef7b JC |
979 | } |
980 | } else { /* Single ended */ | |
3704432f | 981 | switch (shared_by) { |
c006ec83 | 982 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 983 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
984 | break; |
985 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 986 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
987 | iio_direction[chan->output], |
988 | full_postfix); | |
989 | break; | |
3704432f | 990 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 991 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
ade7ef7b JC |
992 | iio_direction[chan->output], |
993 | iio_chan_type_name_spec[chan->type], | |
994 | full_postfix); | |
3704432f JC |
995 | break; |
996 | ||
997 | case IIO_SEPARATE: | |
998 | if (chan->indexed) | |
7bbcf7e1 | 999 | name = kasprintf(GFP_KERNEL, "%s_%s%d_%s", |
3704432f JC |
1000 | iio_direction[chan->output], |
1001 | iio_chan_type_name_spec[chan->type], | |
1002 | chan->channel, | |
1003 | full_postfix); | |
1004 | else | |
7bbcf7e1 | 1005 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
3704432f JC |
1006 | iio_direction[chan->output], |
1007 | iio_chan_type_name_spec[chan->type], | |
1008 | full_postfix); | |
1009 | break; | |
1010 | } | |
ade7ef7b | 1011 | } |
7bbcf7e1 | 1012 | if (name == NULL) { |
1d892719 JC |
1013 | ret = -ENOMEM; |
1014 | goto error_free_full_postfix; | |
1015 | } | |
7bbcf7e1 | 1016 | dev_attr->attr.name = name; |
1d892719 JC |
1017 | |
1018 | if (readfunc) { | |
1019 | dev_attr->attr.mode |= S_IRUGO; | |
1020 | dev_attr->show = readfunc; | |
1021 | } | |
1022 | ||
1023 | if (writefunc) { | |
1024 | dev_attr->attr.mode |= S_IWUSR; | |
1025 | dev_attr->store = writefunc; | |
1026 | } | |
7bbcf7e1 | 1027 | |
1d892719 JC |
1028 | error_free_full_postfix: |
1029 | kfree(full_postfix); | |
3704432f | 1030 | |
1d892719 JC |
1031 | return ret; |
1032 | } | |
1033 | ||
df9c1c42 | 1034 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
1035 | { |
1036 | kfree(dev_attr->attr.name); | |
1037 | } | |
1038 | ||
1039 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
1040 | struct iio_chan_spec const *chan, |
1041 | ssize_t (*readfunc)(struct device *dev, | |
1042 | struct device_attribute *attr, | |
1043 | char *buf), | |
1044 | ssize_t (*writefunc)(struct device *dev, | |
1045 | struct device_attribute *attr, | |
1046 | const char *buf, | |
1047 | size_t len), | |
e614a54b | 1048 | u64 mask, |
3704432f | 1049 | enum iio_shared_by shared_by, |
1d892719 JC |
1050 | struct device *dev, |
1051 | struct list_head *attr_list) | |
1052 | { | |
1053 | int ret; | |
1054 | struct iio_dev_attr *iio_attr, *t; | |
1055 | ||
670c1103 | 1056 | iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL); |
92825ff9 HK |
1057 | if (iio_attr == NULL) |
1058 | return -ENOMEM; | |
1d892719 JC |
1059 | ret = __iio_device_attr_init(&iio_attr->dev_attr, |
1060 | postfix, chan, | |
3704432f | 1061 | readfunc, writefunc, shared_by); |
1d892719 JC |
1062 | if (ret) |
1063 | goto error_iio_dev_attr_free; | |
1064 | iio_attr->c = chan; | |
1065 | iio_attr->address = mask; | |
1066 | list_for_each_entry(t, attr_list, l) | |
1067 | if (strcmp(t->dev_attr.attr.name, | |
1068 | iio_attr->dev_attr.attr.name) == 0) { | |
3704432f | 1069 | if (shared_by == IIO_SEPARATE) |
1d892719 JC |
1070 | dev_err(dev, "tried to double register : %s\n", |
1071 | t->dev_attr.attr.name); | |
1072 | ret = -EBUSY; | |
1073 | goto error_device_attr_deinit; | |
1074 | } | |
1d892719 JC |
1075 | list_add(&iio_attr->l, attr_list); |
1076 | ||
1077 | return 0; | |
1078 | ||
1079 | error_device_attr_deinit: | |
1080 | __iio_device_attr_deinit(&iio_attr->dev_attr); | |
1081 | error_iio_dev_attr_free: | |
1082 | kfree(iio_attr); | |
1d892719 JC |
1083 | return ret; |
1084 | } | |
1085 | ||
3704432f JC |
1086 | static int iio_device_add_info_mask_type(struct iio_dev *indio_dev, |
1087 | struct iio_chan_spec const *chan, | |
1088 | enum iio_shared_by shared_by, | |
1089 | const long *infomask) | |
1d892719 | 1090 | { |
3704432f | 1091 | int i, ret, attrcount = 0; |
1d892719 | 1092 | |
3704432f | 1093 | for_each_set_bit(i, infomask, sizeof(infomask)*8) { |
ef4b4856 JC |
1094 | if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
1095 | return -EINVAL; | |
8655cc49 JC |
1096 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i], |
1097 | chan, | |
1098 | &iio_read_channel_info, | |
1099 | &iio_write_channel_info, | |
1100 | i, | |
3704432f | 1101 | shared_by, |
8655cc49 JC |
1102 | &indio_dev->dev, |
1103 | &indio_dev->channel_attr_list); | |
3704432f | 1104 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
8655cc49 | 1105 | continue; |
3704432f JC |
1106 | else if (ret < 0) |
1107 | return ret; | |
8655cc49 JC |
1108 | attrcount++; |
1109 | } | |
5f420b42 | 1110 | |
3704432f JC |
1111 | return attrcount; |
1112 | } | |
1113 | ||
51239600 JC |
1114 | static int iio_device_add_info_mask_type_avail(struct iio_dev *indio_dev, |
1115 | struct iio_chan_spec const *chan, | |
1116 | enum iio_shared_by shared_by, | |
1117 | const long *infomask) | |
1118 | { | |
1119 | int i, ret, attrcount = 0; | |
1120 | char *avail_postfix; | |
1121 | ||
1122 | for_each_set_bit(i, infomask, sizeof(infomask) * 8) { | |
1123 | avail_postfix = kasprintf(GFP_KERNEL, | |
1124 | "%s_available", | |
1125 | iio_chan_info_postfix[i]); | |
1126 | if (!avail_postfix) | |
1127 | return -ENOMEM; | |
1128 | ||
1129 | ret = __iio_add_chan_devattr(avail_postfix, | |
1130 | chan, | |
1131 | &iio_read_channel_info_avail, | |
1132 | NULL, | |
1133 | i, | |
1134 | shared_by, | |
1135 | &indio_dev->dev, | |
1136 | &indio_dev->channel_attr_list); | |
1137 | kfree(avail_postfix); | |
1138 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) | |
1139 | continue; | |
1140 | else if (ret < 0) | |
1141 | return ret; | |
1142 | attrcount++; | |
1143 | } | |
1144 | ||
1145 | return attrcount; | |
1146 | } | |
1147 | ||
3704432f JC |
1148 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, |
1149 | struct iio_chan_spec const *chan) | |
1150 | { | |
1151 | int ret, attrcount = 0; | |
1152 | const struct iio_chan_spec_ext_info *ext_info; | |
1153 | ||
1154 | if (chan->channel < 0) | |
1155 | return 0; | |
1156 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
1157 | IIO_SEPARATE, | |
1158 | &chan->info_mask_separate); | |
1159 | if (ret < 0) | |
1160 | return ret; | |
1161 | attrcount += ret; | |
1162 | ||
51239600 JC |
1163 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1164 | IIO_SEPARATE, | |
1165 | &chan-> | |
1166 | info_mask_separate_available); | |
1167 | if (ret < 0) | |
1168 | return ret; | |
1169 | attrcount += ret; | |
1170 | ||
3704432f JC |
1171 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1172 | IIO_SHARED_BY_TYPE, | |
1173 | &chan->info_mask_shared_by_type); | |
1174 | if (ret < 0) | |
1175 | return ret; | |
1176 | attrcount += ret; | |
1177 | ||
51239600 JC |
1178 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1179 | IIO_SHARED_BY_TYPE, | |
1180 | &chan-> | |
1181 | info_mask_shared_by_type_available); | |
1182 | if (ret < 0) | |
1183 | return ret; | |
1184 | attrcount += ret; | |
1185 | ||
c006ec83 JC |
1186 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1187 | IIO_SHARED_BY_DIR, | |
1188 | &chan->info_mask_shared_by_dir); | |
1189 | if (ret < 0) | |
1190 | return ret; | |
1191 | attrcount += ret; | |
1192 | ||
51239600 JC |
1193 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1194 | IIO_SHARED_BY_DIR, | |
1195 | &chan->info_mask_shared_by_dir_available); | |
1196 | if (ret < 0) | |
1197 | return ret; | |
1198 | attrcount += ret; | |
1199 | ||
c006ec83 JC |
1200 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1201 | IIO_SHARED_BY_ALL, | |
1202 | &chan->info_mask_shared_by_all); | |
1203 | if (ret < 0) | |
1204 | return ret; | |
1205 | attrcount += ret; | |
1206 | ||
51239600 JC |
1207 | ret = iio_device_add_info_mask_type_avail(indio_dev, chan, |
1208 | IIO_SHARED_BY_ALL, | |
1209 | &chan->info_mask_shared_by_all_available); | |
1210 | if (ret < 0) | |
1211 | return ret; | |
1212 | attrcount += ret; | |
1213 | ||
5f420b42 LPC |
1214 | if (chan->ext_info) { |
1215 | unsigned int i = 0; | |
1216 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { | |
1217 | ret = __iio_add_chan_devattr(ext_info->name, | |
1218 | chan, | |
1219 | ext_info->read ? | |
1220 | &iio_read_channel_ext_info : NULL, | |
1221 | ext_info->write ? | |
1222 | &iio_write_channel_ext_info : NULL, | |
1223 | i, | |
1224 | ext_info->shared, | |
1225 | &indio_dev->dev, | |
1226 | &indio_dev->channel_attr_list); | |
1227 | i++; | |
1228 | if (ret == -EBUSY && ext_info->shared) | |
1229 | continue; | |
1230 | ||
1231 | if (ret) | |
3704432f | 1232 | return ret; |
5f420b42 LPC |
1233 | |
1234 | attrcount++; | |
1235 | } | |
1236 | } | |
1237 | ||
3704432f | 1238 | return attrcount; |
1d892719 JC |
1239 | } |
1240 | ||
84088ebd LPC |
1241 | /** |
1242 | * iio_free_chan_devattr_list() - Free a list of IIO device attributes | |
1243 | * @attr_list: List of IIO device attributes | |
1244 | * | |
1245 | * This function frees the memory allocated for each of the IIO device | |
c1b03ab5 | 1246 | * attributes in the list. |
84088ebd LPC |
1247 | */ |
1248 | void iio_free_chan_devattr_list(struct list_head *attr_list) | |
1d892719 | 1249 | { |
84088ebd LPC |
1250 | struct iio_dev_attr *p, *n; |
1251 | ||
1252 | list_for_each_entry_safe(p, n, attr_list, l) { | |
1253 | kfree(p->dev_attr.attr.name); | |
c1b03ab5 | 1254 | list_del(&p->l); |
84088ebd LPC |
1255 | kfree(p); |
1256 | } | |
1d892719 JC |
1257 | } |
1258 | ||
1b732888 JC |
1259 | static ssize_t iio_show_dev_name(struct device *dev, |
1260 | struct device_attribute *attr, | |
1261 | char *buf) | |
1262 | { | |
e53f5ac5 | 1263 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
598db581 | 1264 | return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name); |
1b732888 JC |
1265 | } |
1266 | ||
1267 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
1268 | ||
bc2b7dab GB |
1269 | static ssize_t iio_show_timestamp_clock(struct device *dev, |
1270 | struct device_attribute *attr, | |
1271 | char *buf) | |
1272 | { | |
1273 | const struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
1274 | const clockid_t clk = iio_device_get_clock(indio_dev); | |
1275 | const char *name; | |
1276 | ssize_t sz; | |
1277 | ||
1278 | switch (clk) { | |
1279 | case CLOCK_REALTIME: | |
1280 | name = "realtime\n"; | |
1281 | sz = sizeof("realtime\n"); | |
1282 | break; | |
1283 | case CLOCK_MONOTONIC: | |
1284 | name = "monotonic\n"; | |
1285 | sz = sizeof("monotonic\n"); | |
1286 | break; | |
1287 | case CLOCK_MONOTONIC_RAW: | |
1288 | name = "monotonic_raw\n"; | |
1289 | sz = sizeof("monotonic_raw\n"); | |
1290 | break; | |
1291 | case CLOCK_REALTIME_COARSE: | |
1292 | name = "realtime_coarse\n"; | |
1293 | sz = sizeof("realtime_coarse\n"); | |
1294 | break; | |
1295 | case CLOCK_MONOTONIC_COARSE: | |
1296 | name = "monotonic_coarse\n"; | |
1297 | sz = sizeof("monotonic_coarse\n"); | |
1298 | break; | |
1299 | case CLOCK_BOOTTIME: | |
1300 | name = "boottime\n"; | |
1301 | sz = sizeof("boottime\n"); | |
1302 | break; | |
1303 | case CLOCK_TAI: | |
1304 | name = "tai\n"; | |
1305 | sz = sizeof("tai\n"); | |
1306 | break; | |
1307 | default: | |
1308 | BUG(); | |
1309 | } | |
1310 | ||
1311 | memcpy(buf, name, sz); | |
1312 | return sz; | |
1313 | } | |
1314 | ||
1315 | static ssize_t iio_store_timestamp_clock(struct device *dev, | |
1316 | struct device_attribute *attr, | |
1317 | const char *buf, size_t len) | |
1318 | { | |
1319 | clockid_t clk; | |
1320 | int ret; | |
1321 | ||
1322 | if (sysfs_streq(buf, "realtime")) | |
1323 | clk = CLOCK_REALTIME; | |
1324 | else if (sysfs_streq(buf, "monotonic")) | |
1325 | clk = CLOCK_MONOTONIC; | |
1326 | else if (sysfs_streq(buf, "monotonic_raw")) | |
1327 | clk = CLOCK_MONOTONIC_RAW; | |
1328 | else if (sysfs_streq(buf, "realtime_coarse")) | |
1329 | clk = CLOCK_REALTIME_COARSE; | |
1330 | else if (sysfs_streq(buf, "monotonic_coarse")) | |
1331 | clk = CLOCK_MONOTONIC_COARSE; | |
1332 | else if (sysfs_streq(buf, "boottime")) | |
1333 | clk = CLOCK_BOOTTIME; | |
1334 | else if (sysfs_streq(buf, "tai")) | |
1335 | clk = CLOCK_TAI; | |
1336 | else | |
1337 | return -EINVAL; | |
1338 | ||
1339 | ret = iio_device_set_clock(dev_to_iio_dev(dev), clk); | |
1340 | if (ret) | |
1341 | return ret; | |
1342 | ||
1343 | return len; | |
1344 | } | |
1345 | ||
1346 | static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR, | |
1347 | iio_show_timestamp_clock, iio_store_timestamp_clock); | |
1348 | ||
f8c6f4e9 | 1349 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 1350 | { |
26d25ae3 | 1351 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
84088ebd | 1352 | struct iio_dev_attr *p; |
bc2b7dab | 1353 | struct attribute **attr, *clk = NULL; |
1d892719 | 1354 | |
26d25ae3 | 1355 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
1356 | if (indio_dev->info->attrs) { |
1357 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
1358 | while (*attr++ != NULL) |
1359 | attrcount_orig++; | |
847ec80b | 1360 | } |
26d25ae3 | 1361 | attrcount = attrcount_orig; |
1d892719 JC |
1362 | /* |
1363 | * New channel registration method - relies on the fact a group does | |
d25b3808 | 1364 | * not need to be initialized if its name is NULL. |
1d892719 | 1365 | */ |
f8c6f4e9 JC |
1366 | if (indio_dev->channels) |
1367 | for (i = 0; i < indio_dev->num_channels; i++) { | |
bc2b7dab GB |
1368 | const struct iio_chan_spec *chan = |
1369 | &indio_dev->channels[i]; | |
1370 | ||
1371 | if (chan->type == IIO_TIMESTAMP) | |
1372 | clk = &dev_attr_current_timestamp_clock.attr; | |
1373 | ||
1374 | ret = iio_device_add_channel_sysfs(indio_dev, chan); | |
1d892719 JC |
1375 | if (ret < 0) |
1376 | goto error_clear_attrs; | |
26d25ae3 | 1377 | attrcount += ret; |
1d892719 | 1378 | } |
26d25ae3 | 1379 | |
bc2b7dab GB |
1380 | if (indio_dev->event_interface) |
1381 | clk = &dev_attr_current_timestamp_clock.attr; | |
1382 | ||
f8c6f4e9 | 1383 | if (indio_dev->name) |
26d25ae3 | 1384 | attrcount++; |
bc2b7dab GB |
1385 | if (clk) |
1386 | attrcount++; | |
26d25ae3 | 1387 | |
d83fb184 TM |
1388 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
1389 | sizeof(indio_dev->chan_attr_group.attrs[0]), | |
1390 | GFP_KERNEL); | |
f8c6f4e9 | 1391 | if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3 JC |
1392 | ret = -ENOMEM; |
1393 | goto error_clear_attrs; | |
1b732888 | 1394 | } |
26d25ae3 | 1395 | /* Copy across original attributes */ |
f8c6f4e9 JC |
1396 | if (indio_dev->info->attrs) |
1397 | memcpy(indio_dev->chan_attr_group.attrs, | |
1398 | indio_dev->info->attrs->attrs, | |
1399 | sizeof(indio_dev->chan_attr_group.attrs[0]) | |
26d25ae3 JC |
1400 | *attrcount_orig); |
1401 | attrn = attrcount_orig; | |
1402 | /* Add all elements from the list. */ | |
f8c6f4e9 JC |
1403 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
1404 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; | |
1405 | if (indio_dev->name) | |
1406 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; | |
bc2b7dab GB |
1407 | if (clk) |
1408 | indio_dev->chan_attr_group.attrs[attrn++] = clk; | |
26d25ae3 | 1409 | |
f8c6f4e9 JC |
1410 | indio_dev->groups[indio_dev->groupcounter++] = |
1411 | &indio_dev->chan_attr_group; | |
26d25ae3 | 1412 | |
1d892719 | 1413 | return 0; |
1b732888 | 1414 | |
1d892719 | 1415 | error_clear_attrs: |
84088ebd | 1416 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
1d892719 | 1417 | |
26d25ae3 | 1418 | return ret; |
847ec80b JC |
1419 | } |
1420 | ||
f8c6f4e9 | 1421 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 1422 | { |
1d892719 | 1423 | |
84088ebd | 1424 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
f8c6f4e9 | 1425 | kfree(indio_dev->chan_attr_group.attrs); |
c1b03ab5 | 1426 | indio_dev->chan_attr_group.attrs = NULL; |
847ec80b JC |
1427 | } |
1428 | ||
847ec80b JC |
1429 | static void iio_dev_release(struct device *device) |
1430 | { | |
e53f5ac5 | 1431 | struct iio_dev *indio_dev = dev_to_iio_dev(device); |
735ad074 | 1432 | if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED)) |
f8c6f4e9 JC |
1433 | iio_device_unregister_trigger_consumer(indio_dev); |
1434 | iio_device_unregister_eventset(indio_dev); | |
1435 | iio_device_unregister_sysfs(indio_dev); | |
e407fd65 | 1436 | |
9e69c935 LPC |
1437 | iio_buffer_put(indio_dev->buffer); |
1438 | ||
e407fd65 LPC |
1439 | ida_simple_remove(&iio_ida, indio_dev->id); |
1440 | kfree(indio_dev); | |
847ec80b JC |
1441 | } |
1442 | ||
17d82b47 | 1443 | struct device_type iio_device_type = { |
847ec80b JC |
1444 | .name = "iio_device", |
1445 | .release = iio_dev_release, | |
1446 | }; | |
1447 | ||
a7e57dce SK |
1448 | /** |
1449 | * iio_device_alloc() - allocate an iio_dev from a driver | |
1450 | * @sizeof_priv: Space to allocate for private structure. | |
1451 | **/ | |
7cbb7537 | 1452 | struct iio_dev *iio_device_alloc(int sizeof_priv) |
847ec80b | 1453 | { |
6f7c8ee5 JC |
1454 | struct iio_dev *dev; |
1455 | size_t alloc_size; | |
1456 | ||
1457 | alloc_size = sizeof(struct iio_dev); | |
1458 | if (sizeof_priv) { | |
1459 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); | |
1460 | alloc_size += sizeof_priv; | |
1461 | } | |
1462 | /* ensure 32-byte alignment of whole construct ? */ | |
1463 | alloc_size += IIO_ALIGN - 1; | |
1464 | ||
1465 | dev = kzalloc(alloc_size, GFP_KERNEL); | |
847ec80b JC |
1466 | |
1467 | if (dev) { | |
26d25ae3 | 1468 | dev->dev.groups = dev->groups; |
17d82b47 | 1469 | dev->dev.type = &iio_device_type; |
5aaaeba8 | 1470 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
1471 | device_initialize(&dev->dev); |
1472 | dev_set_drvdata(&dev->dev, (void *)dev); | |
1473 | mutex_init(&dev->mlock); | |
ac917a81 | 1474 | mutex_init(&dev->info_exist_lock); |
e407fd65 | 1475 | INIT_LIST_HEAD(&dev->channel_attr_list); |
a9e39f9e JC |
1476 | |
1477 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); | |
1478 | if (dev->id < 0) { | |
1479 | /* cannot use a dev_err as the name isn't available */ | |
3176dd5d | 1480 | pr_err("failed to get device id\n"); |
a9e39f9e JC |
1481 | kfree(dev); |
1482 | return NULL; | |
1483 | } | |
1484 | dev_set_name(&dev->dev, "iio:device%d", dev->id); | |
84b36ce5 | 1485 | INIT_LIST_HEAD(&dev->buffer_list); |
847ec80b JC |
1486 | } |
1487 | ||
1488 | return dev; | |
1489 | } | |
7cbb7537 | 1490 | EXPORT_SYMBOL(iio_device_alloc); |
847ec80b | 1491 | |
a7e57dce SK |
1492 | /** |
1493 | * iio_device_free() - free an iio_dev from a driver | |
1494 | * @dev: the iio_dev associated with the device | |
1495 | **/ | |
7cbb7537 | 1496 | void iio_device_free(struct iio_dev *dev) |
847ec80b | 1497 | { |
e407fd65 LPC |
1498 | if (dev) |
1499 | put_device(&dev->dev); | |
847ec80b | 1500 | } |
7cbb7537 | 1501 | EXPORT_SYMBOL(iio_device_free); |
847ec80b | 1502 | |
9dabaf5e GS |
1503 | static void devm_iio_device_release(struct device *dev, void *res) |
1504 | { | |
1505 | iio_device_free(*(struct iio_dev **)res); | |
1506 | } | |
1507 | ||
70e48348 | 1508 | int devm_iio_device_match(struct device *dev, void *res, void *data) |
9dabaf5e GS |
1509 | { |
1510 | struct iio_dev **r = res; | |
1511 | if (!r || !*r) { | |
1512 | WARN_ON(!r || !*r); | |
1513 | return 0; | |
1514 | } | |
1515 | return *r == data; | |
1516 | } | |
70e48348 | 1517 | EXPORT_SYMBOL_GPL(devm_iio_device_match); |
9dabaf5e | 1518 | |
a7e57dce SK |
1519 | /** |
1520 | * devm_iio_device_alloc - Resource-managed iio_device_alloc() | |
1521 | * @dev: Device to allocate iio_dev for | |
1522 | * @sizeof_priv: Space to allocate for private structure. | |
1523 | * | |
1524 | * Managed iio_device_alloc. iio_dev allocated with this function is | |
1525 | * automatically freed on driver detach. | |
1526 | * | |
1527 | * If an iio_dev allocated with this function needs to be freed separately, | |
1528 | * devm_iio_device_free() must be used. | |
1529 | * | |
1530 | * RETURNS: | |
1531 | * Pointer to allocated iio_dev on success, NULL on failure. | |
1532 | */ | |
9dabaf5e GS |
1533 | struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv) |
1534 | { | |
1535 | struct iio_dev **ptr, *iio_dev; | |
1536 | ||
1537 | ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr), | |
1538 | GFP_KERNEL); | |
1539 | if (!ptr) | |
1540 | return NULL; | |
1541 | ||
9dabaf5e GS |
1542 | iio_dev = iio_device_alloc(sizeof_priv); |
1543 | if (iio_dev) { | |
1544 | *ptr = iio_dev; | |
1545 | devres_add(dev, ptr); | |
1546 | } else { | |
1547 | devres_free(ptr); | |
1548 | } | |
1549 | ||
1550 | return iio_dev; | |
1551 | } | |
1552 | EXPORT_SYMBOL_GPL(devm_iio_device_alloc); | |
1553 | ||
a7e57dce SK |
1554 | /** |
1555 | * devm_iio_device_free - Resource-managed iio_device_free() | |
1556 | * @dev: Device this iio_dev belongs to | |
1557 | * @iio_dev: the iio_dev associated with the device | |
1558 | * | |
1559 | * Free iio_dev allocated with devm_iio_device_alloc(). | |
1560 | */ | |
9dabaf5e GS |
1561 | void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev) |
1562 | { | |
1563 | int rc; | |
1564 | ||
1565 | rc = devres_release(dev, devm_iio_device_release, | |
1566 | devm_iio_device_match, iio_dev); | |
1567 | WARN_ON(rc); | |
1568 | } | |
1569 | EXPORT_SYMBOL_GPL(devm_iio_device_free); | |
1570 | ||
1aa04278 | 1571 | /** |
14555b14 | 1572 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
2498dcf6 CO |
1573 | * @inode: Inode structure for identifying the device in the file system |
1574 | * @filp: File structure for iio device used to keep and later access | |
1575 | * private data | |
1576 | * | |
1577 | * Return: 0 on success or -EBUSY if the device is already opened | |
1aa04278 JC |
1578 | **/ |
1579 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
1580 | { | |
f8c6f4e9 | 1581 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 1582 | struct iio_dev, chrdev); |
bb01443e LPC |
1583 | |
1584 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
1585 | return -EBUSY; | |
1586 | ||
cadc2125 LPC |
1587 | iio_device_get(indio_dev); |
1588 | ||
f8c6f4e9 | 1589 | filp->private_data = indio_dev; |
30eb82f0 | 1590 | |
79335140 | 1591 | return 0; |
1aa04278 JC |
1592 | } |
1593 | ||
1594 | /** | |
14555b14 | 1595 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
2498dcf6 CO |
1596 | * @inode: Inode structure pointer for the char device |
1597 | * @filp: File structure pointer for the char device | |
1598 | * | |
1599 | * Return: 0 for successful release | |
1600 | */ | |
1aa04278 JC |
1601 | static int iio_chrdev_release(struct inode *inode, struct file *filp) |
1602 | { | |
bb01443e LPC |
1603 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1604 | struct iio_dev, chrdev); | |
bb01443e | 1605 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
cadc2125 LPC |
1606 | iio_device_put(indio_dev); |
1607 | ||
1aa04278 JC |
1608 | return 0; |
1609 | } | |
1610 | ||
1611 | /* Somewhat of a cross file organization violation - ioctls here are actually | |
1612 | * event related */ | |
1613 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1614 | { | |
1615 | struct iio_dev *indio_dev = filp->private_data; | |
1616 | int __user *ip = (int __user *)arg; | |
1617 | int fd; | |
1618 | ||
f18e7a06 LPC |
1619 | if (!indio_dev->info) |
1620 | return -ENODEV; | |
1621 | ||
1aa04278 JC |
1622 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { |
1623 | fd = iio_event_getfd(indio_dev); | |
3f9059b7 LW |
1624 | if (fd < 0) |
1625 | return fd; | |
1aa04278 JC |
1626 | if (copy_to_user(ip, &fd, sizeof(fd))) |
1627 | return -EFAULT; | |
1628 | return 0; | |
1629 | } | |
1630 | return -EINVAL; | |
1631 | } | |
1632 | ||
14555b14 JC |
1633 | static const struct file_operations iio_buffer_fileops = { |
1634 | .read = iio_buffer_read_first_n_outer_addr, | |
1aa04278 JC |
1635 | .release = iio_chrdev_release, |
1636 | .open = iio_chrdev_open, | |
14555b14 | 1637 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
1638 | .owner = THIS_MODULE, |
1639 | .llseek = noop_llseek, | |
1640 | .unlocked_ioctl = iio_ioctl, | |
1641 | .compat_ioctl = iio_ioctl, | |
1642 | }; | |
1643 | ||
8f5d8727 VD |
1644 | static int iio_check_unique_scan_index(struct iio_dev *indio_dev) |
1645 | { | |
1646 | int i, j; | |
1647 | const struct iio_chan_spec *channels = indio_dev->channels; | |
1648 | ||
1649 | if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES)) | |
1650 | return 0; | |
1651 | ||
1652 | for (i = 0; i < indio_dev->num_channels - 1; i++) { | |
1653 | if (channels[i].scan_index < 0) | |
1654 | continue; | |
1655 | for (j = i + 1; j < indio_dev->num_channels; j++) | |
1656 | if (channels[i].scan_index == channels[j].scan_index) { | |
1657 | dev_err(&indio_dev->dev, | |
1658 | "Duplicate scan index %d\n", | |
1659 | channels[i].scan_index); | |
1660 | return -EINVAL; | |
1661 | } | |
1662 | } | |
1663 | ||
1664 | return 0; | |
1665 | } | |
1666 | ||
0f1acee5 MH |
1667 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
1668 | ||
a7e57dce SK |
1669 | /** |
1670 | * iio_device_register() - register a device with the IIO subsystem | |
1671 | * @indio_dev: Device structure filled by the device driver | |
1672 | **/ | |
f8c6f4e9 | 1673 | int iio_device_register(struct iio_dev *indio_dev) |
847ec80b JC |
1674 | { |
1675 | int ret; | |
1676 | ||
17d82b47 GR |
1677 | /* If the calling driver did not initialize of_node, do it here */ |
1678 | if (!indio_dev->dev.of_node && indio_dev->dev.parent) | |
1679 | indio_dev->dev.of_node = indio_dev->dev.parent->of_node; | |
1680 | ||
8f5d8727 VD |
1681 | ret = iio_check_unique_scan_index(indio_dev); |
1682 | if (ret < 0) | |
1683 | return ret; | |
1684 | ||
1aa04278 | 1685 | /* configure elements for the chrdev */ |
f8c6f4e9 | 1686 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 1687 | |
e553f182 MH |
1688 | ret = iio_device_register_debugfs(indio_dev); |
1689 | if (ret) { | |
1690 | dev_err(indio_dev->dev.parent, | |
1691 | "Failed to register debugfs interfaces\n"); | |
92825ff9 | 1692 | return ret; |
e553f182 | 1693 | } |
3e1b6c95 LPC |
1694 | |
1695 | ret = iio_buffer_alloc_sysfs_and_mask(indio_dev); | |
1696 | if (ret) { | |
1697 | dev_err(indio_dev->dev.parent, | |
1698 | "Failed to create buffer sysfs interfaces\n"); | |
1699 | goto error_unreg_debugfs; | |
1700 | } | |
1701 | ||
f8c6f4e9 | 1702 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 1703 | if (ret) { |
f8c6f4e9 | 1704 | dev_err(indio_dev->dev.parent, |
847ec80b | 1705 | "Failed to register sysfs interfaces\n"); |
3e1b6c95 | 1706 | goto error_buffer_free_sysfs; |
847ec80b | 1707 | } |
f8c6f4e9 | 1708 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 1709 | if (ret) { |
f8c6f4e9 | 1710 | dev_err(indio_dev->dev.parent, |
c849d253 | 1711 | "Failed to register event set\n"); |
847ec80b JC |
1712 | goto error_free_sysfs; |
1713 | } | |
735ad074 | 1714 | if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED)) |
f8c6f4e9 | 1715 | iio_device_register_trigger_consumer(indio_dev); |
847ec80b | 1716 | |
0f1acee5 MH |
1717 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
1718 | indio_dev->setup_ops == NULL) | |
1719 | indio_dev->setup_ops = &noop_ring_setup_ops; | |
1720 | ||
f8c6f4e9 JC |
1721 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
1722 | indio_dev->chrdev.owner = indio_dev->info->driver_module; | |
0d5b7dae | 1723 | indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj; |
f8c6f4e9 | 1724 | ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); |
26d25ae3 | 1725 | if (ret < 0) |
0d5b7dae | 1726 | goto error_unreg_eventset; |
847ec80b | 1727 | |
0d5b7dae LPC |
1728 | ret = device_add(&indio_dev->dev); |
1729 | if (ret < 0) | |
1730 | goto error_cdev_del; | |
1731 | ||
1732 | return 0; | |
1733 | error_cdev_del: | |
1734 | cdev_del(&indio_dev->chrdev); | |
26d25ae3 | 1735 | error_unreg_eventset: |
f8c6f4e9 | 1736 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 1737 | error_free_sysfs: |
f8c6f4e9 | 1738 | iio_device_unregister_sysfs(indio_dev); |
3e1b6c95 LPC |
1739 | error_buffer_free_sysfs: |
1740 | iio_buffer_free_sysfs_and_mask(indio_dev); | |
e553f182 MH |
1741 | error_unreg_debugfs: |
1742 | iio_device_unregister_debugfs(indio_dev); | |
847ec80b JC |
1743 | return ret; |
1744 | } | |
1745 | EXPORT_SYMBOL(iio_device_register); | |
1746 | ||
a7e57dce SK |
1747 | /** |
1748 | * iio_device_unregister() - unregister a device from the IIO subsystem | |
1749 | * @indio_dev: Device structure representing the device. | |
1750 | **/ | |
f8c6f4e9 | 1751 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 1752 | { |
ac917a81 | 1753 | mutex_lock(&indio_dev->info_exist_lock); |
a87c82e4 LPC |
1754 | |
1755 | device_del(&indio_dev->dev); | |
1756 | ||
0d5b7dae LPC |
1757 | if (indio_dev->chrdev.dev) |
1758 | cdev_del(&indio_dev->chrdev); | |
bc4c9612 | 1759 | iio_device_unregister_debugfs(indio_dev); |
0d5b7dae | 1760 | |
a87c82e4 LPC |
1761 | iio_disable_all_buffers(indio_dev); |
1762 | ||
ac917a81 | 1763 | indio_dev->info = NULL; |
d2f0a48f LPC |
1764 | |
1765 | iio_device_wakeup_eventset(indio_dev); | |
1766 | iio_buffer_wakeup_poll(indio_dev); | |
1767 | ||
ac917a81 | 1768 | mutex_unlock(&indio_dev->info_exist_lock); |
3e1b6c95 LPC |
1769 | |
1770 | iio_buffer_free_sysfs_and_mask(indio_dev); | |
847ec80b JC |
1771 | } |
1772 | EXPORT_SYMBOL(iio_device_unregister); | |
8caa07c0 SK |
1773 | |
1774 | static void devm_iio_device_unreg(struct device *dev, void *res) | |
1775 | { | |
1776 | iio_device_unregister(*(struct iio_dev **)res); | |
1777 | } | |
1778 | ||
1779 | /** | |
1780 | * devm_iio_device_register - Resource-managed iio_device_register() | |
1781 | * @dev: Device to allocate iio_dev for | |
1782 | * @indio_dev: Device structure filled by the device driver | |
1783 | * | |
1784 | * Managed iio_device_register. The IIO device registered with this | |
1785 | * function is automatically unregistered on driver detach. This function | |
1786 | * calls iio_device_register() internally. Refer to that function for more | |
1787 | * information. | |
1788 | * | |
1789 | * If an iio_dev registered with this function needs to be unregistered | |
1790 | * separately, devm_iio_device_unregister() must be used. | |
1791 | * | |
1792 | * RETURNS: | |
1793 | * 0 on success, negative error number on failure. | |
1794 | */ | |
1795 | int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev) | |
1796 | { | |
1797 | struct iio_dev **ptr; | |
1798 | int ret; | |
1799 | ||
1800 | ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL); | |
1801 | if (!ptr) | |
1802 | return -ENOMEM; | |
1803 | ||
1804 | *ptr = indio_dev; | |
1805 | ret = iio_device_register(indio_dev); | |
1806 | if (!ret) | |
1807 | devres_add(dev, ptr); | |
1808 | else | |
1809 | devres_free(ptr); | |
1810 | ||
1811 | return ret; | |
1812 | } | |
1813 | EXPORT_SYMBOL_GPL(devm_iio_device_register); | |
1814 | ||
1815 | /** | |
1816 | * devm_iio_device_unregister - Resource-managed iio_device_unregister() | |
1817 | * @dev: Device this iio_dev belongs to | |
1818 | * @indio_dev: the iio_dev associated with the device | |
1819 | * | |
1820 | * Unregister iio_dev registered with devm_iio_device_register(). | |
1821 | */ | |
1822 | void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev) | |
1823 | { | |
1824 | int rc; | |
1825 | ||
1826 | rc = devres_release(dev, devm_iio_device_unreg, | |
1827 | devm_iio_device_match, indio_dev); | |
1828 | WARN_ON(rc); | |
1829 | } | |
1830 | EXPORT_SYMBOL_GPL(devm_iio_device_unregister); | |
1831 | ||
08a33805 AS |
1832 | /** |
1833 | * iio_device_claim_direct_mode - Keep device in direct mode | |
1834 | * @indio_dev: the iio_dev associated with the device | |
1835 | * | |
1836 | * If the device is in direct mode it is guaranteed to stay | |
1837 | * that way until iio_device_release_direct_mode() is called. | |
1838 | * | |
1839 | * Use with iio_device_release_direct_mode() | |
1840 | * | |
1841 | * Returns: 0 on success, -EBUSY on failure | |
1842 | */ | |
1843 | int iio_device_claim_direct_mode(struct iio_dev *indio_dev) | |
1844 | { | |
1845 | mutex_lock(&indio_dev->mlock); | |
1846 | ||
1847 | if (iio_buffer_enabled(indio_dev)) { | |
1848 | mutex_unlock(&indio_dev->mlock); | |
1849 | return -EBUSY; | |
1850 | } | |
1851 | return 0; | |
1852 | } | |
1853 | EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode); | |
1854 | ||
1855 | /** | |
1856 | * iio_device_release_direct_mode - releases claim on direct mode | |
1857 | * @indio_dev: the iio_dev associated with the device | |
1858 | * | |
1859 | * Release the claim. Device is no longer guaranteed to stay | |
1860 | * in direct mode. | |
1861 | * | |
1862 | * Use with iio_device_claim_direct_mode() | |
1863 | */ | |
1864 | void iio_device_release_direct_mode(struct iio_dev *indio_dev) | |
1865 | { | |
1866 | mutex_unlock(&indio_dev->mlock); | |
1867 | } | |
1868 | EXPORT_SYMBOL_GPL(iio_device_release_direct_mode); | |
1869 | ||
847ec80b JC |
1870 | subsys_initcall(iio_init); |
1871 | module_exit(iio_exit); | |
1872 | ||
c8b95952 | 1873 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
847ec80b JC |
1874 | MODULE_DESCRIPTION("Industrial I/O core"); |
1875 | MODULE_LICENSE("GPL"); |