Commit | Line | Data |
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847ec80b JC |
1 | /* The industrial I/O core |
2 | * | |
3 | * Copyright (c) 2008 Jonathan Cameron | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | * | |
9 | * Based on elements of hwmon and input subsystems. | |
10 | */ | |
11 | ||
3176dd5d SK |
12 | #define pr_fmt(fmt) "iio-core: " fmt |
13 | ||
847ec80b JC |
14 | #include <linux/kernel.h> |
15 | #include <linux/module.h> | |
16 | #include <linux/idr.h> | |
17 | #include <linux/kdev_t.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/device.h> | |
20 | #include <linux/fs.h> | |
847ec80b | 21 | #include <linux/poll.h> |
ffc18afa | 22 | #include <linux/sched.h> |
4439c935 | 23 | #include <linux/wait.h> |
847ec80b | 24 | #include <linux/cdev.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
8e7d9672 | 26 | #include <linux/anon_inodes.h> |
e553f182 | 27 | #include <linux/debugfs.h> |
08a33805 | 28 | #include <linux/mutex.h> |
06458e27 | 29 | #include <linux/iio/iio.h> |
df9c1c42 | 30 | #include "iio_core.h" |
6aea1c36 | 31 | #include "iio_core_trigger.h" |
06458e27 JC |
32 | #include <linux/iio/sysfs.h> |
33 | #include <linux/iio/events.h> | |
9e69c935 | 34 | #include <linux/iio/buffer.h> |
9dd1cb30 | 35 | |
99698b45 | 36 | /* IDA to assign each registered device a unique id */ |
b156cf70 | 37 | static DEFINE_IDA(iio_ida); |
847ec80b | 38 | |
f625cb97 | 39 | static dev_t iio_devt; |
847ec80b JC |
40 | |
41 | #define IIO_DEV_MAX 256 | |
5aaaeba8 | 42 | struct bus_type iio_bus_type = { |
847ec80b | 43 | .name = "iio", |
847ec80b | 44 | }; |
5aaaeba8 | 45 | EXPORT_SYMBOL(iio_bus_type); |
847ec80b | 46 | |
e553f182 MH |
47 | static struct dentry *iio_debugfs_dentry; |
48 | ||
c6fc8062 JC |
49 | static const char * const iio_direction[] = { |
50 | [0] = "in", | |
51 | [1] = "out", | |
52 | }; | |
53 | ||
ade7ef7b | 54 | static const char * const iio_chan_type_name_spec[] = { |
c6fc8062 | 55 | [IIO_VOLTAGE] = "voltage", |
faf290e8 MH |
56 | [IIO_CURRENT] = "current", |
57 | [IIO_POWER] = "power", | |
9bff02f8 | 58 | [IIO_ACCEL] = "accel", |
41ea040c | 59 | [IIO_ANGL_VEL] = "anglvel", |
1d892719 | 60 | [IIO_MAGN] = "magn", |
9bff02f8 BF |
61 | [IIO_LIGHT] = "illuminance", |
62 | [IIO_INTENSITY] = "intensity", | |
f09f2c81 | 63 | [IIO_PROXIMITY] = "proximity", |
9bff02f8 | 64 | [IIO_TEMP] = "temp", |
1d892719 JC |
65 | [IIO_INCLI] = "incli", |
66 | [IIO_ROT] = "rot", | |
1d892719 | 67 | [IIO_ANGL] = "angl", |
9bff02f8 | 68 | [IIO_TIMESTAMP] = "timestamp", |
66dbe704 | 69 | [IIO_CAPACITANCE] = "capacitance", |
a6b12855 | 70 | [IIO_ALTVOLTAGE] = "altvoltage", |
21cd1fab | 71 | [IIO_CCT] = "cct", |
c4f0c693 | 72 | [IIO_PRESSURE] = "pressure", |
ac216aa2 | 73 | [IIO_HUMIDITYRELATIVE] = "humidityrelative", |
55aebeb9 | 74 | [IIO_ACTIVITY] = "activity", |
a88bfe78 | 75 | [IIO_STEPS] = "steps", |
72c66644 | 76 | [IIO_ENERGY] = "energy", |
cc3c9eec | 77 | [IIO_DISTANCE] = "distance", |
5a1a9329 | 78 | [IIO_VELOCITY] = "velocity", |
8ff6b3bc | 79 | [IIO_CONCENTRATION] = "concentration", |
d38d5469 | 80 | [IIO_RESISTANCE] = "resistance", |
ecb3a7cc | 81 | [IIO_PH] = "ph", |
d409404c | 82 | [IIO_UVINDEX] = "uvindex", |
4b9d2090 | 83 | [IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity", |
1d892719 JC |
84 | }; |
85 | ||
330c6c57 | 86 | static const char * const iio_modifier_names[] = { |
1d892719 JC |
87 | [IIO_MOD_X] = "x", |
88 | [IIO_MOD_Y] = "y", | |
89 | [IIO_MOD_Z] = "z", | |
4b8d8015 PM |
90 | [IIO_MOD_X_AND_Y] = "x&y", |
91 | [IIO_MOD_X_AND_Z] = "x&z", | |
92 | [IIO_MOD_Y_AND_Z] = "y&z", | |
93 | [IIO_MOD_X_AND_Y_AND_Z] = "x&y&z", | |
94 | [IIO_MOD_X_OR_Y] = "x|y", | |
95 | [IIO_MOD_X_OR_Z] = "x|z", | |
96 | [IIO_MOD_Y_OR_Z] = "y|z", | |
97 | [IIO_MOD_X_OR_Y_OR_Z] = "x|y|z", | |
8f5879b2 | 98 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y] = "sqrt(x^2+y^2)", |
cf82cb81 | 99 | [IIO_MOD_SUM_SQUARED_X_Y_Z] = "x^2+y^2+z^2", |
330c6c57 JC |
100 | [IIO_MOD_LIGHT_BOTH] = "both", |
101 | [IIO_MOD_LIGHT_IR] = "ir", | |
21cd1fab JB |
102 | [IIO_MOD_LIGHT_CLEAR] = "clear", |
103 | [IIO_MOD_LIGHT_RED] = "red", | |
104 | [IIO_MOD_LIGHT_GREEN] = "green", | |
105 | [IIO_MOD_LIGHT_BLUE] = "blue", | |
2c5ff1f9 | 106 | [IIO_MOD_LIGHT_UV] = "uv", |
5082f405 | 107 | [IIO_MOD_QUATERNION] = "quaternion", |
638b43b3 PM |
108 | [IIO_MOD_TEMP_AMBIENT] = "ambient", |
109 | [IIO_MOD_TEMP_OBJECT] = "object", | |
11b8ddab RA |
110 | [IIO_MOD_NORTH_MAGN] = "from_north_magnetic", |
111 | [IIO_MOD_NORTH_TRUE] = "from_north_true", | |
112 | [IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp", | |
113 | [IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp", | |
55aebeb9 DB |
114 | [IIO_MOD_RUNNING] = "running", |
115 | [IIO_MOD_JOGGING] = "jogging", | |
116 | [IIO_MOD_WALKING] = "walking", | |
117 | [IIO_MOD_STILL] = "still", | |
5a1a9329 | 118 | [IIO_MOD_ROOT_SUM_SQUARED_X_Y_Z] = "sqrt(x^2+y^2+z^2)", |
1ce87f21 LPC |
119 | [IIO_MOD_I] = "i", |
120 | [IIO_MOD_Q] = "q", | |
8ff6b3bc MR |
121 | [IIO_MOD_CO2] = "co2", |
122 | [IIO_MOD_VOC] = "voc", | |
1d892719 JC |
123 | }; |
124 | ||
125 | /* relies on pairs of these shared then separate */ | |
126 | static const char * const iio_chan_info_postfix[] = { | |
75a973c7 JC |
127 | [IIO_CHAN_INFO_RAW] = "raw", |
128 | [IIO_CHAN_INFO_PROCESSED] = "input", | |
c8a9f805 JC |
129 | [IIO_CHAN_INFO_SCALE] = "scale", |
130 | [IIO_CHAN_INFO_OFFSET] = "offset", | |
131 | [IIO_CHAN_INFO_CALIBSCALE] = "calibscale", | |
132 | [IIO_CHAN_INFO_CALIBBIAS] = "calibbias", | |
133 | [IIO_CHAN_INFO_PEAK] = "peak_raw", | |
134 | [IIO_CHAN_INFO_PEAK_SCALE] = "peak_scale", | |
135 | [IIO_CHAN_INFO_QUADRATURE_CORRECTION_RAW] = "quadrature_correction_raw", | |
136 | [IIO_CHAN_INFO_AVERAGE_RAW] = "mean_raw", | |
df94aba8 JC |
137 | [IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY] |
138 | = "filter_low_pass_3db_frequency", | |
3f7f642b MF |
139 | [IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY] |
140 | = "filter_high_pass_3db_frequency", | |
ce85a1cb | 141 | [IIO_CHAN_INFO_SAMP_FREQ] = "sampling_frequency", |
a6b12855 MH |
142 | [IIO_CHAN_INFO_FREQUENCY] = "frequency", |
143 | [IIO_CHAN_INFO_PHASE] = "phase", | |
b65d6212 | 144 | [IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain", |
7c9ab035 | 145 | [IIO_CHAN_INFO_HYSTERESIS] = "hysteresis", |
899d90bd | 146 | [IIO_CHAN_INFO_INT_TIME] = "integration_time", |
a88bfe78 | 147 | [IIO_CHAN_INFO_ENABLE] = "en", |
bcdf28fb | 148 | [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight", |
d37f6836 | 149 | [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight", |
2f0ecb7c IT |
150 | [IIO_CHAN_INFO_DEBOUNCE_COUNT] = "debounce_count", |
151 | [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time", | |
c8a85854 | 152 | [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity", |
faaa4495 | 153 | [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio", |
1d892719 JC |
154 | }; |
155 | ||
a7e57dce SK |
156 | /** |
157 | * iio_find_channel_from_si() - get channel from its scan index | |
158 | * @indio_dev: device | |
159 | * @si: scan index to match | |
160 | */ | |
5fb21c82 JC |
161 | const struct iio_chan_spec |
162 | *iio_find_channel_from_si(struct iio_dev *indio_dev, int si) | |
163 | { | |
164 | int i; | |
165 | ||
166 | for (i = 0; i < indio_dev->num_channels; i++) | |
167 | if (indio_dev->channels[i].scan_index == si) | |
168 | return &indio_dev->channels[i]; | |
169 | return NULL; | |
170 | } | |
171 | ||
847ec80b JC |
172 | /* This turns up an awful lot */ |
173 | ssize_t iio_read_const_attr(struct device *dev, | |
174 | struct device_attribute *attr, | |
175 | char *buf) | |
176 | { | |
177 | return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); | |
178 | } | |
179 | EXPORT_SYMBOL(iio_read_const_attr); | |
180 | ||
bc2b7dab GB |
181 | static int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id) |
182 | { | |
183 | int ret; | |
184 | const struct iio_event_interface *ev_int = indio_dev->event_interface; | |
185 | ||
186 | ret = mutex_lock_interruptible(&indio_dev->mlock); | |
187 | if (ret) | |
188 | return ret; | |
189 | if ((ev_int && iio_event_enabled(ev_int)) || | |
190 | iio_buffer_enabled(indio_dev)) { | |
191 | mutex_unlock(&indio_dev->mlock); | |
192 | return -EBUSY; | |
193 | } | |
194 | indio_dev->clock_id = clock_id; | |
195 | mutex_unlock(&indio_dev->mlock); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | /** | |
201 | * iio_get_time_ns() - utility function to get a time stamp for events etc | |
202 | * @indio_dev: device | |
203 | */ | |
204 | s64 iio_get_time_ns(const struct iio_dev *indio_dev) | |
205 | { | |
206 | struct timespec tp; | |
207 | ||
208 | switch (iio_device_get_clock(indio_dev)) { | |
209 | case CLOCK_REALTIME: | |
210 | ktime_get_real_ts(&tp); | |
211 | break; | |
212 | case CLOCK_MONOTONIC: | |
213 | ktime_get_ts(&tp); | |
214 | break; | |
215 | case CLOCK_MONOTONIC_RAW: | |
216 | getrawmonotonic(&tp); | |
217 | break; | |
218 | case CLOCK_REALTIME_COARSE: | |
219 | tp = current_kernel_time(); | |
220 | break; | |
221 | case CLOCK_MONOTONIC_COARSE: | |
222 | tp = get_monotonic_coarse(); | |
223 | break; | |
224 | case CLOCK_BOOTTIME: | |
225 | get_monotonic_boottime(&tp); | |
226 | break; | |
227 | case CLOCK_TAI: | |
228 | timekeeping_clocktai(&tp); | |
229 | break; | |
230 | default: | |
231 | BUG(); | |
232 | } | |
233 | ||
234 | return timespec_to_ns(&tp); | |
235 | } | |
236 | EXPORT_SYMBOL(iio_get_time_ns); | |
237 | ||
238 | /** | |
239 | * iio_get_time_res() - utility function to get time stamp clock resolution in | |
240 | * nano seconds. | |
241 | * @indio_dev: device | |
242 | */ | |
243 | unsigned int iio_get_time_res(const struct iio_dev *indio_dev) | |
244 | { | |
245 | switch (iio_device_get_clock(indio_dev)) { | |
246 | case CLOCK_REALTIME: | |
247 | case CLOCK_MONOTONIC: | |
248 | case CLOCK_MONOTONIC_RAW: | |
249 | case CLOCK_BOOTTIME: | |
250 | case CLOCK_TAI: | |
251 | return hrtimer_resolution; | |
252 | case CLOCK_REALTIME_COARSE: | |
253 | case CLOCK_MONOTONIC_COARSE: | |
254 | return LOW_RES_NSEC; | |
255 | default: | |
256 | BUG(); | |
257 | } | |
258 | } | |
259 | EXPORT_SYMBOL(iio_get_time_res); | |
260 | ||
847ec80b JC |
261 | static int __init iio_init(void) |
262 | { | |
263 | int ret; | |
264 | ||
5aaaeba8 JC |
265 | /* Register sysfs bus */ |
266 | ret = bus_register(&iio_bus_type); | |
847ec80b | 267 | if (ret < 0) { |
3176dd5d | 268 | pr_err("could not register bus type\n"); |
847ec80b JC |
269 | goto error_nothing; |
270 | } | |
271 | ||
9aa1a167 JC |
272 | ret = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); |
273 | if (ret < 0) { | |
3176dd5d | 274 | pr_err("failed to allocate char dev region\n"); |
5aaaeba8 | 275 | goto error_unregister_bus_type; |
9aa1a167 | 276 | } |
847ec80b | 277 | |
e553f182 MH |
278 | iio_debugfs_dentry = debugfs_create_dir("iio", NULL); |
279 | ||
847ec80b JC |
280 | return 0; |
281 | ||
5aaaeba8 JC |
282 | error_unregister_bus_type: |
283 | bus_unregister(&iio_bus_type); | |
847ec80b JC |
284 | error_nothing: |
285 | return ret; | |
286 | } | |
287 | ||
288 | static void __exit iio_exit(void) | |
289 | { | |
9aa1a167 JC |
290 | if (iio_devt) |
291 | unregister_chrdev_region(iio_devt, IIO_DEV_MAX); | |
5aaaeba8 | 292 | bus_unregister(&iio_bus_type); |
e553f182 MH |
293 | debugfs_remove(iio_debugfs_dentry); |
294 | } | |
295 | ||
296 | #if defined(CONFIG_DEBUG_FS) | |
e553f182 MH |
297 | static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf, |
298 | size_t count, loff_t *ppos) | |
299 | { | |
300 | struct iio_dev *indio_dev = file->private_data; | |
301 | char buf[20]; | |
302 | unsigned val = 0; | |
303 | ssize_t len; | |
304 | int ret; | |
305 | ||
306 | ret = indio_dev->info->debugfs_reg_access(indio_dev, | |
307 | indio_dev->cached_reg_addr, | |
308 | 0, &val); | |
309 | if (ret) | |
310 | dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__); | |
311 | ||
312 | len = snprintf(buf, sizeof(buf), "0x%X\n", val); | |
313 | ||
314 | return simple_read_from_buffer(userbuf, count, ppos, buf, len); | |
315 | } | |
316 | ||
317 | static ssize_t iio_debugfs_write_reg(struct file *file, | |
318 | const char __user *userbuf, size_t count, loff_t *ppos) | |
319 | { | |
320 | struct iio_dev *indio_dev = file->private_data; | |
321 | unsigned reg, val; | |
322 | char buf[80]; | |
323 | int ret; | |
324 | ||
325 | count = min_t(size_t, count, (sizeof(buf)-1)); | |
326 | if (copy_from_user(buf, userbuf, count)) | |
327 | return -EFAULT; | |
328 | ||
329 | buf[count] = 0; | |
330 | ||
331 | ret = sscanf(buf, "%i %i", ®, &val); | |
332 | ||
333 | switch (ret) { | |
334 | case 1: | |
335 | indio_dev->cached_reg_addr = reg; | |
336 | break; | |
337 | case 2: | |
338 | indio_dev->cached_reg_addr = reg; | |
339 | ret = indio_dev->info->debugfs_reg_access(indio_dev, reg, | |
340 | val, NULL); | |
341 | if (ret) { | |
342 | dev_err(indio_dev->dev.parent, "%s: write failed\n", | |
343 | __func__); | |
344 | return ret; | |
345 | } | |
346 | break; | |
347 | default: | |
348 | return -EINVAL; | |
349 | } | |
350 | ||
351 | return count; | |
352 | } | |
353 | ||
354 | static const struct file_operations iio_debugfs_reg_fops = { | |
5a28c873 | 355 | .open = simple_open, |
e553f182 MH |
356 | .read = iio_debugfs_read_reg, |
357 | .write = iio_debugfs_write_reg, | |
358 | }; | |
359 | ||
360 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
361 | { | |
362 | debugfs_remove_recursive(indio_dev->debugfs_dentry); | |
847ec80b JC |
363 | } |
364 | ||
e553f182 MH |
365 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) |
366 | { | |
367 | struct dentry *d; | |
368 | ||
369 | if (indio_dev->info->debugfs_reg_access == NULL) | |
370 | return 0; | |
371 | ||
abd5a2fb | 372 | if (!iio_debugfs_dentry) |
e553f182 MH |
373 | return 0; |
374 | ||
375 | indio_dev->debugfs_dentry = | |
376 | debugfs_create_dir(dev_name(&indio_dev->dev), | |
377 | iio_debugfs_dentry); | |
e553f182 MH |
378 | if (indio_dev->debugfs_dentry == NULL) { |
379 | dev_warn(indio_dev->dev.parent, | |
380 | "Failed to create debugfs directory\n"); | |
381 | return -EFAULT; | |
382 | } | |
383 | ||
384 | d = debugfs_create_file("direct_reg_access", 0644, | |
385 | indio_dev->debugfs_dentry, | |
386 | indio_dev, &iio_debugfs_reg_fops); | |
387 | if (!d) { | |
388 | iio_device_unregister_debugfs(indio_dev); | |
389 | return -ENOMEM; | |
390 | } | |
391 | ||
392 | return 0; | |
393 | } | |
394 | #else | |
395 | static int iio_device_register_debugfs(struct iio_dev *indio_dev) | |
396 | { | |
397 | return 0; | |
398 | } | |
399 | ||
400 | static void iio_device_unregister_debugfs(struct iio_dev *indio_dev) | |
401 | { | |
402 | } | |
403 | #endif /* CONFIG_DEBUG_FS */ | |
404 | ||
4fee7e16 LPC |
405 | static ssize_t iio_read_channel_ext_info(struct device *dev, |
406 | struct device_attribute *attr, | |
407 | char *buf) | |
408 | { | |
e53f5ac5 | 409 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
410 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
411 | const struct iio_chan_spec_ext_info *ext_info; | |
412 | ||
413 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
414 | ||
fc6d1139 | 415 | return ext_info->read(indio_dev, ext_info->private, this_attr->c, buf); |
4fee7e16 LPC |
416 | } |
417 | ||
418 | static ssize_t iio_write_channel_ext_info(struct device *dev, | |
419 | struct device_attribute *attr, | |
420 | const char *buf, | |
421 | size_t len) | |
422 | { | |
e53f5ac5 | 423 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
4fee7e16 LPC |
424 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
425 | const struct iio_chan_spec_ext_info *ext_info; | |
426 | ||
427 | ext_info = &this_attr->c->ext_info[this_attr->address]; | |
428 | ||
fc6d1139 MH |
429 | return ext_info->write(indio_dev, ext_info->private, |
430 | this_attr->c, buf, len); | |
4fee7e16 LPC |
431 | } |
432 | ||
5212cc8a LPC |
433 | ssize_t iio_enum_available_read(struct iio_dev *indio_dev, |
434 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
435 | { | |
436 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
437 | unsigned int i; | |
438 | size_t len = 0; | |
439 | ||
440 | if (!e->num_items) | |
441 | return 0; | |
442 | ||
443 | for (i = 0; i < e->num_items; ++i) | |
74dcd439 | 444 | len += scnprintf(buf + len, PAGE_SIZE - len, "%s ", e->items[i]); |
5212cc8a LPC |
445 | |
446 | /* replace last space with a newline */ | |
447 | buf[len - 1] = '\n'; | |
448 | ||
449 | return len; | |
450 | } | |
451 | EXPORT_SYMBOL_GPL(iio_enum_available_read); | |
452 | ||
453 | ssize_t iio_enum_read(struct iio_dev *indio_dev, | |
454 | uintptr_t priv, const struct iio_chan_spec *chan, char *buf) | |
455 | { | |
456 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
457 | int i; | |
458 | ||
459 | if (!e->get) | |
460 | return -EINVAL; | |
461 | ||
462 | i = e->get(indio_dev, chan); | |
463 | if (i < 0) | |
464 | return i; | |
465 | else if (i >= e->num_items) | |
466 | return -EINVAL; | |
467 | ||
598db581 | 468 | return snprintf(buf, PAGE_SIZE, "%s\n", e->items[i]); |
5212cc8a LPC |
469 | } |
470 | EXPORT_SYMBOL_GPL(iio_enum_read); | |
471 | ||
472 | ssize_t iio_enum_write(struct iio_dev *indio_dev, | |
473 | uintptr_t priv, const struct iio_chan_spec *chan, const char *buf, | |
474 | size_t len) | |
475 | { | |
476 | const struct iio_enum *e = (const struct iio_enum *)priv; | |
477 | unsigned int i; | |
478 | int ret; | |
479 | ||
480 | if (!e->set) | |
481 | return -EINVAL; | |
482 | ||
483 | for (i = 0; i < e->num_items; i++) { | |
484 | if (sysfs_streq(buf, e->items[i])) | |
485 | break; | |
486 | } | |
487 | ||
488 | if (i == e->num_items) | |
489 | return -EINVAL; | |
490 | ||
491 | ret = e->set(indio_dev, chan, i); | |
492 | return ret ? ret : len; | |
493 | } | |
494 | EXPORT_SYMBOL_GPL(iio_enum_write); | |
495 | ||
dfc57732 GB |
496 | static const struct iio_mount_matrix iio_mount_idmatrix = { |
497 | .rotation = { | |
498 | "1", "0", "0", | |
499 | "0", "1", "0", | |
500 | "0", "0", "1" | |
501 | } | |
502 | }; | |
503 | ||
504 | static int iio_setup_mount_idmatrix(const struct device *dev, | |
505 | struct iio_mount_matrix *matrix) | |
506 | { | |
507 | *matrix = iio_mount_idmatrix; | |
508 | dev_info(dev, "mounting matrix not found: using identity...\n"); | |
509 | return 0; | |
510 | } | |
511 | ||
512 | ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv, | |
513 | const struct iio_chan_spec *chan, char *buf) | |
514 | { | |
515 | const struct iio_mount_matrix *mtx = ((iio_get_mount_matrix_t *) | |
516 | priv)(indio_dev, chan); | |
517 | ||
518 | if (IS_ERR(mtx)) | |
519 | return PTR_ERR(mtx); | |
520 | ||
521 | if (!mtx) | |
522 | mtx = &iio_mount_idmatrix; | |
523 | ||
524 | return snprintf(buf, PAGE_SIZE, "%s, %s, %s; %s, %s, %s; %s, %s, %s\n", | |
525 | mtx->rotation[0], mtx->rotation[1], mtx->rotation[2], | |
526 | mtx->rotation[3], mtx->rotation[4], mtx->rotation[5], | |
527 | mtx->rotation[6], mtx->rotation[7], mtx->rotation[8]); | |
528 | } | |
529 | EXPORT_SYMBOL_GPL(iio_show_mount_matrix); | |
530 | ||
531 | /** | |
532 | * of_iio_read_mount_matrix() - retrieve iio device mounting matrix from | |
533 | * device-tree "mount-matrix" property | |
534 | * @dev: device the mounting matrix property is assigned to | |
535 | * @propname: device specific mounting matrix property name | |
536 | * @matrix: where to store retrieved matrix | |
537 | * | |
538 | * If device is assigned no mounting matrix property, a default 3x3 identity | |
539 | * matrix will be filled in. | |
540 | * | |
541 | * Return: 0 if success, or a negative error code on failure. | |
542 | */ | |
543 | #ifdef CONFIG_OF | |
544 | int of_iio_read_mount_matrix(const struct device *dev, | |
545 | const char *propname, | |
546 | struct iio_mount_matrix *matrix) | |
547 | { | |
548 | if (dev->of_node) { | |
549 | int err = of_property_read_string_array(dev->of_node, | |
550 | propname, matrix->rotation, | |
551 | ARRAY_SIZE(iio_mount_idmatrix.rotation)); | |
552 | ||
553 | if (err == ARRAY_SIZE(iio_mount_idmatrix.rotation)) | |
554 | return 0; | |
555 | ||
556 | if (err >= 0) | |
557 | /* Invalid number of matrix entries. */ | |
558 | return -EINVAL; | |
559 | ||
560 | if (err != -EINVAL) | |
561 | /* Invalid matrix declaration format. */ | |
562 | return err; | |
563 | } | |
564 | ||
565 | /* Matrix was not declared at all: fallback to identity. */ | |
566 | return iio_setup_mount_idmatrix(dev, matrix); | |
567 | } | |
568 | #else | |
569 | int of_iio_read_mount_matrix(const struct device *dev, | |
570 | const char *propname, | |
571 | struct iio_mount_matrix *matrix) | |
572 | { | |
573 | return iio_setup_mount_idmatrix(dev, matrix); | |
574 | } | |
575 | #endif | |
576 | EXPORT_SYMBOL(of_iio_read_mount_matrix); | |
577 | ||
3661f3f5 LPC |
578 | /** |
579 | * iio_format_value() - Formats a IIO value into its string representation | |
2498dcf6 CO |
580 | * @buf: The buffer to which the formatted value gets written |
581 | * @type: One of the IIO_VAL_... constants. This decides how the val | |
582 | * and val2 parameters are formatted. | |
583 | * @size: Number of IIO value entries contained in vals | |
584 | * @vals: Pointer to the values, exact meaning depends on the | |
585 | * type parameter. | |
586 | * | |
587 | * Return: 0 by default, a negative number on failure or the | |
588 | * total number of characters written for a type that belongs | |
589 | * to the IIO_VAL_... constant. | |
3661f3f5 | 590 | */ |
9fbfb4b3 | 591 | ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals) |
847ec80b | 592 | { |
7985e7c1 | 593 | unsigned long long tmp; |
67eedba3 | 594 | bool scale_db = false; |
1d892719 | 595 | |
3661f3f5 | 596 | switch (type) { |
67eedba3 | 597 | case IIO_VAL_INT: |
9fbfb4b3 | 598 | return sprintf(buf, "%d\n", vals[0]); |
67eedba3 MH |
599 | case IIO_VAL_INT_PLUS_MICRO_DB: |
600 | scale_db = true; | |
601 | case IIO_VAL_INT_PLUS_MICRO: | |
9fbfb4b3 | 602 | if (vals[1] < 0) |
8f57e4d9 MN |
603 | return sprintf(buf, "-%d.%06u%s\n", abs(vals[0]), |
604 | -vals[1], scale_db ? " dB" : ""); | |
1d892719 | 605 | else |
9fbfb4b3 | 606 | return sprintf(buf, "%d.%06u%s\n", vals[0], vals[1], |
67eedba3 MH |
607 | scale_db ? " dB" : ""); |
608 | case IIO_VAL_INT_PLUS_NANO: | |
9fbfb4b3 | 609 | if (vals[1] < 0) |
8f57e4d9 MN |
610 | return sprintf(buf, "-%d.%09u\n", abs(vals[0]), |
611 | -vals[1]); | |
71646e2c | 612 | else |
9fbfb4b3 | 613 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); |
7985e7c1 | 614 | case IIO_VAL_FRACTIONAL: |
9fbfb4b3 SP |
615 | tmp = div_s64((s64)vals[0] * 1000000000LL, vals[1]); |
616 | vals[1] = do_div(tmp, 1000000000LL); | |
617 | vals[0] = tmp; | |
618 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); | |
103d9fb9 | 619 | case IIO_VAL_FRACTIONAL_LOG2: |
9fbfb4b3 SP |
620 | tmp = (s64)vals[0] * 1000000000LL >> vals[1]; |
621 | vals[1] = do_div(tmp, 1000000000LL); | |
622 | vals[0] = tmp; | |
623 | return sprintf(buf, "%d.%09u\n", vals[0], vals[1]); | |
624 | case IIO_VAL_INT_MULTIPLE: | |
625 | { | |
626 | int i; | |
627 | int len = 0; | |
628 | ||
629 | for (i = 0; i < size; ++i) | |
630 | len += snprintf(&buf[len], PAGE_SIZE - len, "%d ", | |
631 | vals[i]); | |
632 | len += snprintf(&buf[len], PAGE_SIZE - len, "\n"); | |
633 | return len; | |
634 | } | |
67eedba3 | 635 | default: |
1d892719 | 636 | return 0; |
67eedba3 | 637 | } |
1d892719 | 638 | } |
7d2c2aca | 639 | EXPORT_SYMBOL_GPL(iio_format_value); |
1d892719 | 640 | |
3661f3f5 LPC |
641 | static ssize_t iio_read_channel_info(struct device *dev, |
642 | struct device_attribute *attr, | |
643 | char *buf) | |
644 | { | |
645 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
646 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); | |
9fbfb4b3 SP |
647 | int vals[INDIO_MAX_RAW_ELEMENTS]; |
648 | int ret; | |
649 | int val_len = 2; | |
650 | ||
651 | if (indio_dev->info->read_raw_multi) | |
652 | ret = indio_dev->info->read_raw_multi(indio_dev, this_attr->c, | |
653 | INDIO_MAX_RAW_ELEMENTS, | |
654 | vals, &val_len, | |
655 | this_attr->address); | |
656 | else | |
657 | ret = indio_dev->info->read_raw(indio_dev, this_attr->c, | |
658 | &vals[0], &vals[1], this_attr->address); | |
3661f3f5 LPC |
659 | |
660 | if (ret < 0) | |
661 | return ret; | |
662 | ||
9fbfb4b3 | 663 | return iio_format_value(buf, ret, val_len, vals); |
3661f3f5 LPC |
664 | } |
665 | ||
6807d721 LPC |
666 | /** |
667 | * iio_str_to_fixpoint() - Parse a fixed-point number from a string | |
668 | * @str: The string to parse | |
669 | * @fract_mult: Multiplier for the first decimal place, should be a power of 10 | |
670 | * @integer: The integer part of the number | |
671 | * @fract: The fractional part of the number | |
672 | * | |
673 | * Returns 0 on success, or a negative error code if the string could not be | |
674 | * parsed. | |
675 | */ | |
676 | int iio_str_to_fixpoint(const char *str, int fract_mult, | |
677 | int *integer, int *fract) | |
678 | { | |
679 | int i = 0, f = 0; | |
680 | bool integer_part = true, negative = false; | |
681 | ||
f47dff32 SN |
682 | if (fract_mult == 0) { |
683 | *fract = 0; | |
684 | ||
685 | return kstrtoint(str, 0, integer); | |
686 | } | |
687 | ||
6807d721 LPC |
688 | if (str[0] == '-') { |
689 | negative = true; | |
690 | str++; | |
691 | } else if (str[0] == '+') { | |
692 | str++; | |
693 | } | |
694 | ||
695 | while (*str) { | |
696 | if ('0' <= *str && *str <= '9') { | |
697 | if (integer_part) { | |
698 | i = i * 10 + *str - '0'; | |
699 | } else { | |
700 | f += fract_mult * (*str - '0'); | |
701 | fract_mult /= 10; | |
702 | } | |
703 | } else if (*str == '\n') { | |
704 | if (*(str + 1) == '\0') | |
705 | break; | |
706 | else | |
707 | return -EINVAL; | |
708 | } else if (*str == '.' && integer_part) { | |
709 | integer_part = false; | |
710 | } else { | |
711 | return -EINVAL; | |
712 | } | |
713 | str++; | |
714 | } | |
715 | ||
716 | if (negative) { | |
717 | if (i) | |
718 | i = -i; | |
719 | else | |
720 | f = -f; | |
721 | } | |
722 | ||
723 | *integer = i; | |
724 | *fract = f; | |
725 | ||
726 | return 0; | |
727 | } | |
728 | EXPORT_SYMBOL_GPL(iio_str_to_fixpoint); | |
729 | ||
1d892719 JC |
730 | static ssize_t iio_write_channel_info(struct device *dev, |
731 | struct device_attribute *attr, | |
732 | const char *buf, | |
733 | size_t len) | |
734 | { | |
e53f5ac5 | 735 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
1d892719 | 736 | struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
6807d721 LPC |
737 | int ret, fract_mult = 100000; |
738 | int integer, fract; | |
1d892719 JC |
739 | |
740 | /* Assumes decimal - precision based on number of digits */ | |
6fe8135f | 741 | if (!indio_dev->info->write_raw) |
1d892719 | 742 | return -EINVAL; |
5c04af04 MH |
743 | |
744 | if (indio_dev->info->write_raw_get_fmt) | |
745 | switch (indio_dev->info->write_raw_get_fmt(indio_dev, | |
746 | this_attr->c, this_attr->address)) { | |
f47dff32 SN |
747 | case IIO_VAL_INT: |
748 | fract_mult = 0; | |
749 | break; | |
5c04af04 MH |
750 | case IIO_VAL_INT_PLUS_MICRO: |
751 | fract_mult = 100000; | |
752 | break; | |
753 | case IIO_VAL_INT_PLUS_NANO: | |
754 | fract_mult = 100000000; | |
755 | break; | |
756 | default: | |
757 | return -EINVAL; | |
758 | } | |
759 | ||
6807d721 LPC |
760 | ret = iio_str_to_fixpoint(buf, fract_mult, &integer, &fract); |
761 | if (ret) | |
762 | return ret; | |
1d892719 | 763 | |
6fe8135f | 764 | ret = indio_dev->info->write_raw(indio_dev, this_attr->c, |
5c04af04 | 765 | integer, fract, this_attr->address); |
1d892719 JC |
766 | if (ret) |
767 | return ret; | |
768 | ||
769 | return len; | |
770 | } | |
771 | ||
df9c1c42 | 772 | static |
1d892719 JC |
773 | int __iio_device_attr_init(struct device_attribute *dev_attr, |
774 | const char *postfix, | |
775 | struct iio_chan_spec const *chan, | |
776 | ssize_t (*readfunc)(struct device *dev, | |
777 | struct device_attribute *attr, | |
778 | char *buf), | |
779 | ssize_t (*writefunc)(struct device *dev, | |
780 | struct device_attribute *attr, | |
781 | const char *buf, | |
782 | size_t len), | |
3704432f | 783 | enum iio_shared_by shared_by) |
1d892719 | 784 | { |
3704432f | 785 | int ret = 0; |
7bbcf7e1 | 786 | char *name = NULL; |
3704432f | 787 | char *full_postfix; |
1d892719 | 788 | sysfs_attr_init(&dev_attr->attr); |
1d892719 | 789 | |
ade7ef7b | 790 | /* Build up postfix of <extend_name>_<modifier>_postfix */ |
3704432f | 791 | if (chan->modified && (shared_by == IIO_SEPARATE)) { |
ade7ef7b JC |
792 | if (chan->extend_name) |
793 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s_%s", | |
794 | iio_modifier_names[chan | |
795 | ->channel2], | |
796 | chan->extend_name, | |
797 | postfix); | |
798 | else | |
799 | full_postfix = kasprintf(GFP_KERNEL, "%s_%s", | |
800 | iio_modifier_names[chan | |
801 | ->channel2], | |
802 | postfix); | |
803 | } else { | |
77bfa8ba | 804 | if (chan->extend_name == NULL || shared_by != IIO_SEPARATE) |
ade7ef7b JC |
805 | full_postfix = kstrdup(postfix, GFP_KERNEL); |
806 | else | |
807 | full_postfix = kasprintf(GFP_KERNEL, | |
808 | "%s_%s", | |
809 | chan->extend_name, | |
810 | postfix); | |
811 | } | |
3704432f JC |
812 | if (full_postfix == NULL) |
813 | return -ENOMEM; | |
1d892719 | 814 | |
4abf6f8b | 815 | if (chan->differential) { /* Differential can not have modifier */ |
3704432f | 816 | switch (shared_by) { |
c006ec83 | 817 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 818 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
819 | break; |
820 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 821 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
822 | iio_direction[chan->output], |
823 | full_postfix); | |
824 | break; | |
3704432f | 825 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 826 | name = kasprintf(GFP_KERNEL, "%s_%s-%s_%s", |
ade7ef7b JC |
827 | iio_direction[chan->output], |
828 | iio_chan_type_name_spec[chan->type], | |
829 | iio_chan_type_name_spec[chan->type], | |
830 | full_postfix); | |
3704432f JC |
831 | break; |
832 | case IIO_SEPARATE: | |
833 | if (!chan->indexed) { | |
231bfe53 | 834 | WARN(1, "Differential channels must be indexed\n"); |
3704432f JC |
835 | ret = -EINVAL; |
836 | goto error_free_full_postfix; | |
837 | } | |
7bbcf7e1 | 838 | name = kasprintf(GFP_KERNEL, |
3704432f | 839 | "%s_%s%d-%s%d_%s", |
ade7ef7b JC |
840 | iio_direction[chan->output], |
841 | iio_chan_type_name_spec[chan->type], | |
842 | chan->channel, | |
843 | iio_chan_type_name_spec[chan->type], | |
844 | chan->channel2, | |
845 | full_postfix); | |
3704432f | 846 | break; |
ade7ef7b JC |
847 | } |
848 | } else { /* Single ended */ | |
3704432f | 849 | switch (shared_by) { |
c006ec83 | 850 | case IIO_SHARED_BY_ALL: |
7bbcf7e1 | 851 | name = kasprintf(GFP_KERNEL, "%s", full_postfix); |
c006ec83 JC |
852 | break; |
853 | case IIO_SHARED_BY_DIR: | |
7bbcf7e1 | 854 | name = kasprintf(GFP_KERNEL, "%s_%s", |
c006ec83 JC |
855 | iio_direction[chan->output], |
856 | full_postfix); | |
857 | break; | |
3704432f | 858 | case IIO_SHARED_BY_TYPE: |
7bbcf7e1 | 859 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
ade7ef7b JC |
860 | iio_direction[chan->output], |
861 | iio_chan_type_name_spec[chan->type], | |
862 | full_postfix); | |
3704432f JC |
863 | break; |
864 | ||
865 | case IIO_SEPARATE: | |
866 | if (chan->indexed) | |
7bbcf7e1 | 867 | name = kasprintf(GFP_KERNEL, "%s_%s%d_%s", |
3704432f JC |
868 | iio_direction[chan->output], |
869 | iio_chan_type_name_spec[chan->type], | |
870 | chan->channel, | |
871 | full_postfix); | |
872 | else | |
7bbcf7e1 | 873 | name = kasprintf(GFP_KERNEL, "%s_%s_%s", |
3704432f JC |
874 | iio_direction[chan->output], |
875 | iio_chan_type_name_spec[chan->type], | |
876 | full_postfix); | |
877 | break; | |
878 | } | |
ade7ef7b | 879 | } |
7bbcf7e1 | 880 | if (name == NULL) { |
1d892719 JC |
881 | ret = -ENOMEM; |
882 | goto error_free_full_postfix; | |
883 | } | |
7bbcf7e1 | 884 | dev_attr->attr.name = name; |
1d892719 JC |
885 | |
886 | if (readfunc) { | |
887 | dev_attr->attr.mode |= S_IRUGO; | |
888 | dev_attr->show = readfunc; | |
889 | } | |
890 | ||
891 | if (writefunc) { | |
892 | dev_attr->attr.mode |= S_IWUSR; | |
893 | dev_attr->store = writefunc; | |
894 | } | |
7bbcf7e1 | 895 | |
1d892719 JC |
896 | error_free_full_postfix: |
897 | kfree(full_postfix); | |
3704432f | 898 | |
1d892719 JC |
899 | return ret; |
900 | } | |
901 | ||
df9c1c42 | 902 | static void __iio_device_attr_deinit(struct device_attribute *dev_attr) |
1d892719 JC |
903 | { |
904 | kfree(dev_attr->attr.name); | |
905 | } | |
906 | ||
907 | int __iio_add_chan_devattr(const char *postfix, | |
1d892719 JC |
908 | struct iio_chan_spec const *chan, |
909 | ssize_t (*readfunc)(struct device *dev, | |
910 | struct device_attribute *attr, | |
911 | char *buf), | |
912 | ssize_t (*writefunc)(struct device *dev, | |
913 | struct device_attribute *attr, | |
914 | const char *buf, | |
915 | size_t len), | |
e614a54b | 916 | u64 mask, |
3704432f | 917 | enum iio_shared_by shared_by, |
1d892719 JC |
918 | struct device *dev, |
919 | struct list_head *attr_list) | |
920 | { | |
921 | int ret; | |
922 | struct iio_dev_attr *iio_attr, *t; | |
923 | ||
670c1103 | 924 | iio_attr = kzalloc(sizeof(*iio_attr), GFP_KERNEL); |
92825ff9 HK |
925 | if (iio_attr == NULL) |
926 | return -ENOMEM; | |
1d892719 JC |
927 | ret = __iio_device_attr_init(&iio_attr->dev_attr, |
928 | postfix, chan, | |
3704432f | 929 | readfunc, writefunc, shared_by); |
1d892719 JC |
930 | if (ret) |
931 | goto error_iio_dev_attr_free; | |
932 | iio_attr->c = chan; | |
933 | iio_attr->address = mask; | |
934 | list_for_each_entry(t, attr_list, l) | |
935 | if (strcmp(t->dev_attr.attr.name, | |
936 | iio_attr->dev_attr.attr.name) == 0) { | |
3704432f | 937 | if (shared_by == IIO_SEPARATE) |
1d892719 JC |
938 | dev_err(dev, "tried to double register : %s\n", |
939 | t->dev_attr.attr.name); | |
940 | ret = -EBUSY; | |
941 | goto error_device_attr_deinit; | |
942 | } | |
1d892719 JC |
943 | list_add(&iio_attr->l, attr_list); |
944 | ||
945 | return 0; | |
946 | ||
947 | error_device_attr_deinit: | |
948 | __iio_device_attr_deinit(&iio_attr->dev_attr); | |
949 | error_iio_dev_attr_free: | |
950 | kfree(iio_attr); | |
1d892719 JC |
951 | return ret; |
952 | } | |
953 | ||
3704432f JC |
954 | static int iio_device_add_info_mask_type(struct iio_dev *indio_dev, |
955 | struct iio_chan_spec const *chan, | |
956 | enum iio_shared_by shared_by, | |
957 | const long *infomask) | |
1d892719 | 958 | { |
3704432f | 959 | int i, ret, attrcount = 0; |
1d892719 | 960 | |
3704432f | 961 | for_each_set_bit(i, infomask, sizeof(infomask)*8) { |
ef4b4856 JC |
962 | if (i >= ARRAY_SIZE(iio_chan_info_postfix)) |
963 | return -EINVAL; | |
8655cc49 JC |
964 | ret = __iio_add_chan_devattr(iio_chan_info_postfix[i], |
965 | chan, | |
966 | &iio_read_channel_info, | |
967 | &iio_write_channel_info, | |
968 | i, | |
3704432f | 969 | shared_by, |
8655cc49 JC |
970 | &indio_dev->dev, |
971 | &indio_dev->channel_attr_list); | |
3704432f | 972 | if ((ret == -EBUSY) && (shared_by != IIO_SEPARATE)) |
8655cc49 | 973 | continue; |
3704432f JC |
974 | else if (ret < 0) |
975 | return ret; | |
8655cc49 JC |
976 | attrcount++; |
977 | } | |
5f420b42 | 978 | |
3704432f JC |
979 | return attrcount; |
980 | } | |
981 | ||
982 | static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev, | |
983 | struct iio_chan_spec const *chan) | |
984 | { | |
985 | int ret, attrcount = 0; | |
986 | const struct iio_chan_spec_ext_info *ext_info; | |
987 | ||
988 | if (chan->channel < 0) | |
989 | return 0; | |
990 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
991 | IIO_SEPARATE, | |
992 | &chan->info_mask_separate); | |
993 | if (ret < 0) | |
994 | return ret; | |
995 | attrcount += ret; | |
996 | ||
997 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
998 | IIO_SHARED_BY_TYPE, | |
999 | &chan->info_mask_shared_by_type); | |
1000 | if (ret < 0) | |
1001 | return ret; | |
1002 | attrcount += ret; | |
1003 | ||
c006ec83 JC |
1004 | ret = iio_device_add_info_mask_type(indio_dev, chan, |
1005 | IIO_SHARED_BY_DIR, | |
1006 | &chan->info_mask_shared_by_dir); | |
1007 | if (ret < 0) | |
1008 | return ret; | |
1009 | attrcount += ret; | |
1010 | ||
1011 | ret = iio_device_add_info_mask_type(indio_dev, chan, | |
1012 | IIO_SHARED_BY_ALL, | |
1013 | &chan->info_mask_shared_by_all); | |
1014 | if (ret < 0) | |
1015 | return ret; | |
1016 | attrcount += ret; | |
1017 | ||
5f420b42 LPC |
1018 | if (chan->ext_info) { |
1019 | unsigned int i = 0; | |
1020 | for (ext_info = chan->ext_info; ext_info->name; ext_info++) { | |
1021 | ret = __iio_add_chan_devattr(ext_info->name, | |
1022 | chan, | |
1023 | ext_info->read ? | |
1024 | &iio_read_channel_ext_info : NULL, | |
1025 | ext_info->write ? | |
1026 | &iio_write_channel_ext_info : NULL, | |
1027 | i, | |
1028 | ext_info->shared, | |
1029 | &indio_dev->dev, | |
1030 | &indio_dev->channel_attr_list); | |
1031 | i++; | |
1032 | if (ret == -EBUSY && ext_info->shared) | |
1033 | continue; | |
1034 | ||
1035 | if (ret) | |
3704432f | 1036 | return ret; |
5f420b42 LPC |
1037 | |
1038 | attrcount++; | |
1039 | } | |
1040 | } | |
1041 | ||
3704432f | 1042 | return attrcount; |
1d892719 JC |
1043 | } |
1044 | ||
84088ebd LPC |
1045 | /** |
1046 | * iio_free_chan_devattr_list() - Free a list of IIO device attributes | |
1047 | * @attr_list: List of IIO device attributes | |
1048 | * | |
1049 | * This function frees the memory allocated for each of the IIO device | |
c1b03ab5 | 1050 | * attributes in the list. |
84088ebd LPC |
1051 | */ |
1052 | void iio_free_chan_devattr_list(struct list_head *attr_list) | |
1d892719 | 1053 | { |
84088ebd LPC |
1054 | struct iio_dev_attr *p, *n; |
1055 | ||
1056 | list_for_each_entry_safe(p, n, attr_list, l) { | |
1057 | kfree(p->dev_attr.attr.name); | |
c1b03ab5 | 1058 | list_del(&p->l); |
84088ebd LPC |
1059 | kfree(p); |
1060 | } | |
1d892719 JC |
1061 | } |
1062 | ||
1b732888 JC |
1063 | static ssize_t iio_show_dev_name(struct device *dev, |
1064 | struct device_attribute *attr, | |
1065 | char *buf) | |
1066 | { | |
e53f5ac5 | 1067 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
598db581 | 1068 | return snprintf(buf, PAGE_SIZE, "%s\n", indio_dev->name); |
1b732888 JC |
1069 | } |
1070 | ||
1071 | static DEVICE_ATTR(name, S_IRUGO, iio_show_dev_name, NULL); | |
1072 | ||
bc2b7dab GB |
1073 | static ssize_t iio_show_timestamp_clock(struct device *dev, |
1074 | struct device_attribute *attr, | |
1075 | char *buf) | |
1076 | { | |
1077 | const struct iio_dev *indio_dev = dev_to_iio_dev(dev); | |
1078 | const clockid_t clk = iio_device_get_clock(indio_dev); | |
1079 | const char *name; | |
1080 | ssize_t sz; | |
1081 | ||
1082 | switch (clk) { | |
1083 | case CLOCK_REALTIME: | |
1084 | name = "realtime\n"; | |
1085 | sz = sizeof("realtime\n"); | |
1086 | break; | |
1087 | case CLOCK_MONOTONIC: | |
1088 | name = "monotonic\n"; | |
1089 | sz = sizeof("monotonic\n"); | |
1090 | break; | |
1091 | case CLOCK_MONOTONIC_RAW: | |
1092 | name = "monotonic_raw\n"; | |
1093 | sz = sizeof("monotonic_raw\n"); | |
1094 | break; | |
1095 | case CLOCK_REALTIME_COARSE: | |
1096 | name = "realtime_coarse\n"; | |
1097 | sz = sizeof("realtime_coarse\n"); | |
1098 | break; | |
1099 | case CLOCK_MONOTONIC_COARSE: | |
1100 | name = "monotonic_coarse\n"; | |
1101 | sz = sizeof("monotonic_coarse\n"); | |
1102 | break; | |
1103 | case CLOCK_BOOTTIME: | |
1104 | name = "boottime\n"; | |
1105 | sz = sizeof("boottime\n"); | |
1106 | break; | |
1107 | case CLOCK_TAI: | |
1108 | name = "tai\n"; | |
1109 | sz = sizeof("tai\n"); | |
1110 | break; | |
1111 | default: | |
1112 | BUG(); | |
1113 | } | |
1114 | ||
1115 | memcpy(buf, name, sz); | |
1116 | return sz; | |
1117 | } | |
1118 | ||
1119 | static ssize_t iio_store_timestamp_clock(struct device *dev, | |
1120 | struct device_attribute *attr, | |
1121 | const char *buf, size_t len) | |
1122 | { | |
1123 | clockid_t clk; | |
1124 | int ret; | |
1125 | ||
1126 | if (sysfs_streq(buf, "realtime")) | |
1127 | clk = CLOCK_REALTIME; | |
1128 | else if (sysfs_streq(buf, "monotonic")) | |
1129 | clk = CLOCK_MONOTONIC; | |
1130 | else if (sysfs_streq(buf, "monotonic_raw")) | |
1131 | clk = CLOCK_MONOTONIC_RAW; | |
1132 | else if (sysfs_streq(buf, "realtime_coarse")) | |
1133 | clk = CLOCK_REALTIME_COARSE; | |
1134 | else if (sysfs_streq(buf, "monotonic_coarse")) | |
1135 | clk = CLOCK_MONOTONIC_COARSE; | |
1136 | else if (sysfs_streq(buf, "boottime")) | |
1137 | clk = CLOCK_BOOTTIME; | |
1138 | else if (sysfs_streq(buf, "tai")) | |
1139 | clk = CLOCK_TAI; | |
1140 | else | |
1141 | return -EINVAL; | |
1142 | ||
1143 | ret = iio_device_set_clock(dev_to_iio_dev(dev), clk); | |
1144 | if (ret) | |
1145 | return ret; | |
1146 | ||
1147 | return len; | |
1148 | } | |
1149 | ||
1150 | static DEVICE_ATTR(current_timestamp_clock, S_IRUGO | S_IWUSR, | |
1151 | iio_show_timestamp_clock, iio_store_timestamp_clock); | |
1152 | ||
f8c6f4e9 | 1153 | static int iio_device_register_sysfs(struct iio_dev *indio_dev) |
1d892719 | 1154 | { |
26d25ae3 | 1155 | int i, ret = 0, attrcount, attrn, attrcount_orig = 0; |
84088ebd | 1156 | struct iio_dev_attr *p; |
bc2b7dab | 1157 | struct attribute **attr, *clk = NULL; |
1d892719 | 1158 | |
26d25ae3 | 1159 | /* First count elements in any existing group */ |
f8c6f4e9 JC |
1160 | if (indio_dev->info->attrs) { |
1161 | attr = indio_dev->info->attrs->attrs; | |
26d25ae3 JC |
1162 | while (*attr++ != NULL) |
1163 | attrcount_orig++; | |
847ec80b | 1164 | } |
26d25ae3 | 1165 | attrcount = attrcount_orig; |
1d892719 JC |
1166 | /* |
1167 | * New channel registration method - relies on the fact a group does | |
d25b3808 | 1168 | * not need to be initialized if its name is NULL. |
1d892719 | 1169 | */ |
f8c6f4e9 JC |
1170 | if (indio_dev->channels) |
1171 | for (i = 0; i < indio_dev->num_channels; i++) { | |
bc2b7dab GB |
1172 | const struct iio_chan_spec *chan = |
1173 | &indio_dev->channels[i]; | |
1174 | ||
1175 | if (chan->type == IIO_TIMESTAMP) | |
1176 | clk = &dev_attr_current_timestamp_clock.attr; | |
1177 | ||
1178 | ret = iio_device_add_channel_sysfs(indio_dev, chan); | |
1d892719 JC |
1179 | if (ret < 0) |
1180 | goto error_clear_attrs; | |
26d25ae3 | 1181 | attrcount += ret; |
1d892719 | 1182 | } |
26d25ae3 | 1183 | |
bc2b7dab GB |
1184 | if (indio_dev->event_interface) |
1185 | clk = &dev_attr_current_timestamp_clock.attr; | |
1186 | ||
f8c6f4e9 | 1187 | if (indio_dev->name) |
26d25ae3 | 1188 | attrcount++; |
bc2b7dab GB |
1189 | if (clk) |
1190 | attrcount++; | |
26d25ae3 | 1191 | |
d83fb184 TM |
1192 | indio_dev->chan_attr_group.attrs = kcalloc(attrcount + 1, |
1193 | sizeof(indio_dev->chan_attr_group.attrs[0]), | |
1194 | GFP_KERNEL); | |
f8c6f4e9 | 1195 | if (indio_dev->chan_attr_group.attrs == NULL) { |
26d25ae3 JC |
1196 | ret = -ENOMEM; |
1197 | goto error_clear_attrs; | |
1b732888 | 1198 | } |
26d25ae3 | 1199 | /* Copy across original attributes */ |
f8c6f4e9 JC |
1200 | if (indio_dev->info->attrs) |
1201 | memcpy(indio_dev->chan_attr_group.attrs, | |
1202 | indio_dev->info->attrs->attrs, | |
1203 | sizeof(indio_dev->chan_attr_group.attrs[0]) | |
26d25ae3 JC |
1204 | *attrcount_orig); |
1205 | attrn = attrcount_orig; | |
1206 | /* Add all elements from the list. */ | |
f8c6f4e9 JC |
1207 | list_for_each_entry(p, &indio_dev->channel_attr_list, l) |
1208 | indio_dev->chan_attr_group.attrs[attrn++] = &p->dev_attr.attr; | |
1209 | if (indio_dev->name) | |
1210 | indio_dev->chan_attr_group.attrs[attrn++] = &dev_attr_name.attr; | |
bc2b7dab GB |
1211 | if (clk) |
1212 | indio_dev->chan_attr_group.attrs[attrn++] = clk; | |
26d25ae3 | 1213 | |
f8c6f4e9 JC |
1214 | indio_dev->groups[indio_dev->groupcounter++] = |
1215 | &indio_dev->chan_attr_group; | |
26d25ae3 | 1216 | |
1d892719 | 1217 | return 0; |
1b732888 | 1218 | |
1d892719 | 1219 | error_clear_attrs: |
84088ebd | 1220 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
1d892719 | 1221 | |
26d25ae3 | 1222 | return ret; |
847ec80b JC |
1223 | } |
1224 | ||
f8c6f4e9 | 1225 | static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) |
847ec80b | 1226 | { |
1d892719 | 1227 | |
84088ebd | 1228 | iio_free_chan_devattr_list(&indio_dev->channel_attr_list); |
f8c6f4e9 | 1229 | kfree(indio_dev->chan_attr_group.attrs); |
c1b03ab5 | 1230 | indio_dev->chan_attr_group.attrs = NULL; |
847ec80b JC |
1231 | } |
1232 | ||
847ec80b JC |
1233 | static void iio_dev_release(struct device *device) |
1234 | { | |
e53f5ac5 | 1235 | struct iio_dev *indio_dev = dev_to_iio_dev(device); |
735ad074 | 1236 | if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED)) |
f8c6f4e9 JC |
1237 | iio_device_unregister_trigger_consumer(indio_dev); |
1238 | iio_device_unregister_eventset(indio_dev); | |
1239 | iio_device_unregister_sysfs(indio_dev); | |
e407fd65 | 1240 | |
9e69c935 LPC |
1241 | iio_buffer_put(indio_dev->buffer); |
1242 | ||
e407fd65 LPC |
1243 | ida_simple_remove(&iio_ida, indio_dev->id); |
1244 | kfree(indio_dev); | |
847ec80b JC |
1245 | } |
1246 | ||
17d82b47 | 1247 | struct device_type iio_device_type = { |
847ec80b JC |
1248 | .name = "iio_device", |
1249 | .release = iio_dev_release, | |
1250 | }; | |
1251 | ||
a7e57dce SK |
1252 | /** |
1253 | * iio_device_alloc() - allocate an iio_dev from a driver | |
1254 | * @sizeof_priv: Space to allocate for private structure. | |
1255 | **/ | |
7cbb7537 | 1256 | struct iio_dev *iio_device_alloc(int sizeof_priv) |
847ec80b | 1257 | { |
6f7c8ee5 JC |
1258 | struct iio_dev *dev; |
1259 | size_t alloc_size; | |
1260 | ||
1261 | alloc_size = sizeof(struct iio_dev); | |
1262 | if (sizeof_priv) { | |
1263 | alloc_size = ALIGN(alloc_size, IIO_ALIGN); | |
1264 | alloc_size += sizeof_priv; | |
1265 | } | |
1266 | /* ensure 32-byte alignment of whole construct ? */ | |
1267 | alloc_size += IIO_ALIGN - 1; | |
1268 | ||
1269 | dev = kzalloc(alloc_size, GFP_KERNEL); | |
847ec80b JC |
1270 | |
1271 | if (dev) { | |
26d25ae3 | 1272 | dev->dev.groups = dev->groups; |
17d82b47 | 1273 | dev->dev.type = &iio_device_type; |
5aaaeba8 | 1274 | dev->dev.bus = &iio_bus_type; |
847ec80b JC |
1275 | device_initialize(&dev->dev); |
1276 | dev_set_drvdata(&dev->dev, (void *)dev); | |
1277 | mutex_init(&dev->mlock); | |
ac917a81 | 1278 | mutex_init(&dev->info_exist_lock); |
e407fd65 | 1279 | INIT_LIST_HEAD(&dev->channel_attr_list); |
a9e39f9e JC |
1280 | |
1281 | dev->id = ida_simple_get(&iio_ida, 0, 0, GFP_KERNEL); | |
1282 | if (dev->id < 0) { | |
1283 | /* cannot use a dev_err as the name isn't available */ | |
3176dd5d | 1284 | pr_err("failed to get device id\n"); |
a9e39f9e JC |
1285 | kfree(dev); |
1286 | return NULL; | |
1287 | } | |
1288 | dev_set_name(&dev->dev, "iio:device%d", dev->id); | |
84b36ce5 | 1289 | INIT_LIST_HEAD(&dev->buffer_list); |
847ec80b JC |
1290 | } |
1291 | ||
1292 | return dev; | |
1293 | } | |
7cbb7537 | 1294 | EXPORT_SYMBOL(iio_device_alloc); |
847ec80b | 1295 | |
a7e57dce SK |
1296 | /** |
1297 | * iio_device_free() - free an iio_dev from a driver | |
1298 | * @dev: the iio_dev associated with the device | |
1299 | **/ | |
7cbb7537 | 1300 | void iio_device_free(struct iio_dev *dev) |
847ec80b | 1301 | { |
e407fd65 LPC |
1302 | if (dev) |
1303 | put_device(&dev->dev); | |
847ec80b | 1304 | } |
7cbb7537 | 1305 | EXPORT_SYMBOL(iio_device_free); |
847ec80b | 1306 | |
9dabaf5e GS |
1307 | static void devm_iio_device_release(struct device *dev, void *res) |
1308 | { | |
1309 | iio_device_free(*(struct iio_dev **)res); | |
1310 | } | |
1311 | ||
1312 | static int devm_iio_device_match(struct device *dev, void *res, void *data) | |
1313 | { | |
1314 | struct iio_dev **r = res; | |
1315 | if (!r || !*r) { | |
1316 | WARN_ON(!r || !*r); | |
1317 | return 0; | |
1318 | } | |
1319 | return *r == data; | |
1320 | } | |
1321 | ||
a7e57dce SK |
1322 | /** |
1323 | * devm_iio_device_alloc - Resource-managed iio_device_alloc() | |
1324 | * @dev: Device to allocate iio_dev for | |
1325 | * @sizeof_priv: Space to allocate for private structure. | |
1326 | * | |
1327 | * Managed iio_device_alloc. iio_dev allocated with this function is | |
1328 | * automatically freed on driver detach. | |
1329 | * | |
1330 | * If an iio_dev allocated with this function needs to be freed separately, | |
1331 | * devm_iio_device_free() must be used. | |
1332 | * | |
1333 | * RETURNS: | |
1334 | * Pointer to allocated iio_dev on success, NULL on failure. | |
1335 | */ | |
9dabaf5e GS |
1336 | struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv) |
1337 | { | |
1338 | struct iio_dev **ptr, *iio_dev; | |
1339 | ||
1340 | ptr = devres_alloc(devm_iio_device_release, sizeof(*ptr), | |
1341 | GFP_KERNEL); | |
1342 | if (!ptr) | |
1343 | return NULL; | |
1344 | ||
9dabaf5e GS |
1345 | iio_dev = iio_device_alloc(sizeof_priv); |
1346 | if (iio_dev) { | |
1347 | *ptr = iio_dev; | |
1348 | devres_add(dev, ptr); | |
1349 | } else { | |
1350 | devres_free(ptr); | |
1351 | } | |
1352 | ||
1353 | return iio_dev; | |
1354 | } | |
1355 | EXPORT_SYMBOL_GPL(devm_iio_device_alloc); | |
1356 | ||
a7e57dce SK |
1357 | /** |
1358 | * devm_iio_device_free - Resource-managed iio_device_free() | |
1359 | * @dev: Device this iio_dev belongs to | |
1360 | * @iio_dev: the iio_dev associated with the device | |
1361 | * | |
1362 | * Free iio_dev allocated with devm_iio_device_alloc(). | |
1363 | */ | |
9dabaf5e GS |
1364 | void devm_iio_device_free(struct device *dev, struct iio_dev *iio_dev) |
1365 | { | |
1366 | int rc; | |
1367 | ||
1368 | rc = devres_release(dev, devm_iio_device_release, | |
1369 | devm_iio_device_match, iio_dev); | |
1370 | WARN_ON(rc); | |
1371 | } | |
1372 | EXPORT_SYMBOL_GPL(devm_iio_device_free); | |
1373 | ||
1aa04278 | 1374 | /** |
14555b14 | 1375 | * iio_chrdev_open() - chrdev file open for buffer access and ioctls |
2498dcf6 CO |
1376 | * @inode: Inode structure for identifying the device in the file system |
1377 | * @filp: File structure for iio device used to keep and later access | |
1378 | * private data | |
1379 | * | |
1380 | * Return: 0 on success or -EBUSY if the device is already opened | |
1aa04278 JC |
1381 | **/ |
1382 | static int iio_chrdev_open(struct inode *inode, struct file *filp) | |
1383 | { | |
f8c6f4e9 | 1384 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1aa04278 | 1385 | struct iio_dev, chrdev); |
bb01443e LPC |
1386 | |
1387 | if (test_and_set_bit(IIO_BUSY_BIT_POS, &indio_dev->flags)) | |
1388 | return -EBUSY; | |
1389 | ||
cadc2125 LPC |
1390 | iio_device_get(indio_dev); |
1391 | ||
f8c6f4e9 | 1392 | filp->private_data = indio_dev; |
30eb82f0 | 1393 | |
79335140 | 1394 | return 0; |
1aa04278 JC |
1395 | } |
1396 | ||
1397 | /** | |
14555b14 | 1398 | * iio_chrdev_release() - chrdev file close buffer access and ioctls |
2498dcf6 CO |
1399 | * @inode: Inode structure pointer for the char device |
1400 | * @filp: File structure pointer for the char device | |
1401 | * | |
1402 | * Return: 0 for successful release | |
1403 | */ | |
1aa04278 JC |
1404 | static int iio_chrdev_release(struct inode *inode, struct file *filp) |
1405 | { | |
bb01443e LPC |
1406 | struct iio_dev *indio_dev = container_of(inode->i_cdev, |
1407 | struct iio_dev, chrdev); | |
bb01443e | 1408 | clear_bit(IIO_BUSY_BIT_POS, &indio_dev->flags); |
cadc2125 LPC |
1409 | iio_device_put(indio_dev); |
1410 | ||
1aa04278 JC |
1411 | return 0; |
1412 | } | |
1413 | ||
1414 | /* Somewhat of a cross file organization violation - ioctls here are actually | |
1415 | * event related */ | |
1416 | static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) | |
1417 | { | |
1418 | struct iio_dev *indio_dev = filp->private_data; | |
1419 | int __user *ip = (int __user *)arg; | |
1420 | int fd; | |
1421 | ||
f18e7a06 LPC |
1422 | if (!indio_dev->info) |
1423 | return -ENODEV; | |
1424 | ||
1aa04278 JC |
1425 | if (cmd == IIO_GET_EVENT_FD_IOCTL) { |
1426 | fd = iio_event_getfd(indio_dev); | |
3f9059b7 LW |
1427 | if (fd < 0) |
1428 | return fd; | |
1aa04278 JC |
1429 | if (copy_to_user(ip, &fd, sizeof(fd))) |
1430 | return -EFAULT; | |
1431 | return 0; | |
1432 | } | |
1433 | return -EINVAL; | |
1434 | } | |
1435 | ||
14555b14 JC |
1436 | static const struct file_operations iio_buffer_fileops = { |
1437 | .read = iio_buffer_read_first_n_outer_addr, | |
1aa04278 JC |
1438 | .release = iio_chrdev_release, |
1439 | .open = iio_chrdev_open, | |
14555b14 | 1440 | .poll = iio_buffer_poll_addr, |
1aa04278 JC |
1441 | .owner = THIS_MODULE, |
1442 | .llseek = noop_llseek, | |
1443 | .unlocked_ioctl = iio_ioctl, | |
1444 | .compat_ioctl = iio_ioctl, | |
1445 | }; | |
1446 | ||
8f5d8727 VD |
1447 | static int iio_check_unique_scan_index(struct iio_dev *indio_dev) |
1448 | { | |
1449 | int i, j; | |
1450 | const struct iio_chan_spec *channels = indio_dev->channels; | |
1451 | ||
1452 | if (!(indio_dev->modes & INDIO_ALL_BUFFER_MODES)) | |
1453 | return 0; | |
1454 | ||
1455 | for (i = 0; i < indio_dev->num_channels - 1; i++) { | |
1456 | if (channels[i].scan_index < 0) | |
1457 | continue; | |
1458 | for (j = i + 1; j < indio_dev->num_channels; j++) | |
1459 | if (channels[i].scan_index == channels[j].scan_index) { | |
1460 | dev_err(&indio_dev->dev, | |
1461 | "Duplicate scan index %d\n", | |
1462 | channels[i].scan_index); | |
1463 | return -EINVAL; | |
1464 | } | |
1465 | } | |
1466 | ||
1467 | return 0; | |
1468 | } | |
1469 | ||
0f1acee5 MH |
1470 | static const struct iio_buffer_setup_ops noop_ring_setup_ops; |
1471 | ||
a7e57dce SK |
1472 | /** |
1473 | * iio_device_register() - register a device with the IIO subsystem | |
1474 | * @indio_dev: Device structure filled by the device driver | |
1475 | **/ | |
f8c6f4e9 | 1476 | int iio_device_register(struct iio_dev *indio_dev) |
847ec80b JC |
1477 | { |
1478 | int ret; | |
1479 | ||
17d82b47 GR |
1480 | /* If the calling driver did not initialize of_node, do it here */ |
1481 | if (!indio_dev->dev.of_node && indio_dev->dev.parent) | |
1482 | indio_dev->dev.of_node = indio_dev->dev.parent->of_node; | |
1483 | ||
8f5d8727 VD |
1484 | ret = iio_check_unique_scan_index(indio_dev); |
1485 | if (ret < 0) | |
1486 | return ret; | |
1487 | ||
1aa04278 | 1488 | /* configure elements for the chrdev */ |
f8c6f4e9 | 1489 | indio_dev->dev.devt = MKDEV(MAJOR(iio_devt), indio_dev->id); |
847ec80b | 1490 | |
e553f182 MH |
1491 | ret = iio_device_register_debugfs(indio_dev); |
1492 | if (ret) { | |
1493 | dev_err(indio_dev->dev.parent, | |
1494 | "Failed to register debugfs interfaces\n"); | |
92825ff9 | 1495 | return ret; |
e553f182 | 1496 | } |
3e1b6c95 LPC |
1497 | |
1498 | ret = iio_buffer_alloc_sysfs_and_mask(indio_dev); | |
1499 | if (ret) { | |
1500 | dev_err(indio_dev->dev.parent, | |
1501 | "Failed to create buffer sysfs interfaces\n"); | |
1502 | goto error_unreg_debugfs; | |
1503 | } | |
1504 | ||
f8c6f4e9 | 1505 | ret = iio_device_register_sysfs(indio_dev); |
847ec80b | 1506 | if (ret) { |
f8c6f4e9 | 1507 | dev_err(indio_dev->dev.parent, |
847ec80b | 1508 | "Failed to register sysfs interfaces\n"); |
3e1b6c95 | 1509 | goto error_buffer_free_sysfs; |
847ec80b | 1510 | } |
f8c6f4e9 | 1511 | ret = iio_device_register_eventset(indio_dev); |
847ec80b | 1512 | if (ret) { |
f8c6f4e9 | 1513 | dev_err(indio_dev->dev.parent, |
c849d253 | 1514 | "Failed to register event set\n"); |
847ec80b JC |
1515 | goto error_free_sysfs; |
1516 | } | |
735ad074 | 1517 | if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED)) |
f8c6f4e9 | 1518 | iio_device_register_trigger_consumer(indio_dev); |
847ec80b | 1519 | |
0f1acee5 MH |
1520 | if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) && |
1521 | indio_dev->setup_ops == NULL) | |
1522 | indio_dev->setup_ops = &noop_ring_setup_ops; | |
1523 | ||
f8c6f4e9 JC |
1524 | cdev_init(&indio_dev->chrdev, &iio_buffer_fileops); |
1525 | indio_dev->chrdev.owner = indio_dev->info->driver_module; | |
0d5b7dae | 1526 | indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj; |
f8c6f4e9 | 1527 | ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1); |
26d25ae3 | 1528 | if (ret < 0) |
0d5b7dae | 1529 | goto error_unreg_eventset; |
847ec80b | 1530 | |
0d5b7dae LPC |
1531 | ret = device_add(&indio_dev->dev); |
1532 | if (ret < 0) | |
1533 | goto error_cdev_del; | |
1534 | ||
1535 | return 0; | |
1536 | error_cdev_del: | |
1537 | cdev_del(&indio_dev->chrdev); | |
26d25ae3 | 1538 | error_unreg_eventset: |
f8c6f4e9 | 1539 | iio_device_unregister_eventset(indio_dev); |
26d25ae3 | 1540 | error_free_sysfs: |
f8c6f4e9 | 1541 | iio_device_unregister_sysfs(indio_dev); |
3e1b6c95 LPC |
1542 | error_buffer_free_sysfs: |
1543 | iio_buffer_free_sysfs_and_mask(indio_dev); | |
e553f182 MH |
1544 | error_unreg_debugfs: |
1545 | iio_device_unregister_debugfs(indio_dev); | |
847ec80b JC |
1546 | return ret; |
1547 | } | |
1548 | EXPORT_SYMBOL(iio_device_register); | |
1549 | ||
a7e57dce SK |
1550 | /** |
1551 | * iio_device_unregister() - unregister a device from the IIO subsystem | |
1552 | * @indio_dev: Device structure representing the device. | |
1553 | **/ | |
f8c6f4e9 | 1554 | void iio_device_unregister(struct iio_dev *indio_dev) |
847ec80b | 1555 | { |
ac917a81 | 1556 | mutex_lock(&indio_dev->info_exist_lock); |
a87c82e4 LPC |
1557 | |
1558 | device_del(&indio_dev->dev); | |
1559 | ||
0d5b7dae LPC |
1560 | if (indio_dev->chrdev.dev) |
1561 | cdev_del(&indio_dev->chrdev); | |
bc4c9612 | 1562 | iio_device_unregister_debugfs(indio_dev); |
0d5b7dae | 1563 | |
a87c82e4 LPC |
1564 | iio_disable_all_buffers(indio_dev); |
1565 | ||
ac917a81 | 1566 | indio_dev->info = NULL; |
d2f0a48f LPC |
1567 | |
1568 | iio_device_wakeup_eventset(indio_dev); | |
1569 | iio_buffer_wakeup_poll(indio_dev); | |
1570 | ||
ac917a81 | 1571 | mutex_unlock(&indio_dev->info_exist_lock); |
3e1b6c95 LPC |
1572 | |
1573 | iio_buffer_free_sysfs_and_mask(indio_dev); | |
847ec80b JC |
1574 | } |
1575 | EXPORT_SYMBOL(iio_device_unregister); | |
8caa07c0 SK |
1576 | |
1577 | static void devm_iio_device_unreg(struct device *dev, void *res) | |
1578 | { | |
1579 | iio_device_unregister(*(struct iio_dev **)res); | |
1580 | } | |
1581 | ||
1582 | /** | |
1583 | * devm_iio_device_register - Resource-managed iio_device_register() | |
1584 | * @dev: Device to allocate iio_dev for | |
1585 | * @indio_dev: Device structure filled by the device driver | |
1586 | * | |
1587 | * Managed iio_device_register. The IIO device registered with this | |
1588 | * function is automatically unregistered on driver detach. This function | |
1589 | * calls iio_device_register() internally. Refer to that function for more | |
1590 | * information. | |
1591 | * | |
1592 | * If an iio_dev registered with this function needs to be unregistered | |
1593 | * separately, devm_iio_device_unregister() must be used. | |
1594 | * | |
1595 | * RETURNS: | |
1596 | * 0 on success, negative error number on failure. | |
1597 | */ | |
1598 | int devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev) | |
1599 | { | |
1600 | struct iio_dev **ptr; | |
1601 | int ret; | |
1602 | ||
1603 | ptr = devres_alloc(devm_iio_device_unreg, sizeof(*ptr), GFP_KERNEL); | |
1604 | if (!ptr) | |
1605 | return -ENOMEM; | |
1606 | ||
1607 | *ptr = indio_dev; | |
1608 | ret = iio_device_register(indio_dev); | |
1609 | if (!ret) | |
1610 | devres_add(dev, ptr); | |
1611 | else | |
1612 | devres_free(ptr); | |
1613 | ||
1614 | return ret; | |
1615 | } | |
1616 | EXPORT_SYMBOL_GPL(devm_iio_device_register); | |
1617 | ||
1618 | /** | |
1619 | * devm_iio_device_unregister - Resource-managed iio_device_unregister() | |
1620 | * @dev: Device this iio_dev belongs to | |
1621 | * @indio_dev: the iio_dev associated with the device | |
1622 | * | |
1623 | * Unregister iio_dev registered with devm_iio_device_register(). | |
1624 | */ | |
1625 | void devm_iio_device_unregister(struct device *dev, struct iio_dev *indio_dev) | |
1626 | { | |
1627 | int rc; | |
1628 | ||
1629 | rc = devres_release(dev, devm_iio_device_unreg, | |
1630 | devm_iio_device_match, indio_dev); | |
1631 | WARN_ON(rc); | |
1632 | } | |
1633 | EXPORT_SYMBOL_GPL(devm_iio_device_unregister); | |
1634 | ||
08a33805 AS |
1635 | /** |
1636 | * iio_device_claim_direct_mode - Keep device in direct mode | |
1637 | * @indio_dev: the iio_dev associated with the device | |
1638 | * | |
1639 | * If the device is in direct mode it is guaranteed to stay | |
1640 | * that way until iio_device_release_direct_mode() is called. | |
1641 | * | |
1642 | * Use with iio_device_release_direct_mode() | |
1643 | * | |
1644 | * Returns: 0 on success, -EBUSY on failure | |
1645 | */ | |
1646 | int iio_device_claim_direct_mode(struct iio_dev *indio_dev) | |
1647 | { | |
1648 | mutex_lock(&indio_dev->mlock); | |
1649 | ||
1650 | if (iio_buffer_enabled(indio_dev)) { | |
1651 | mutex_unlock(&indio_dev->mlock); | |
1652 | return -EBUSY; | |
1653 | } | |
1654 | return 0; | |
1655 | } | |
1656 | EXPORT_SYMBOL_GPL(iio_device_claim_direct_mode); | |
1657 | ||
1658 | /** | |
1659 | * iio_device_release_direct_mode - releases claim on direct mode | |
1660 | * @indio_dev: the iio_dev associated with the device | |
1661 | * | |
1662 | * Release the claim. Device is no longer guaranteed to stay | |
1663 | * in direct mode. | |
1664 | * | |
1665 | * Use with iio_device_claim_direct_mode() | |
1666 | */ | |
1667 | void iio_device_release_direct_mode(struct iio_dev *indio_dev) | |
1668 | { | |
1669 | mutex_unlock(&indio_dev->mlock); | |
1670 | } | |
1671 | EXPORT_SYMBOL_GPL(iio_device_release_direct_mode); | |
1672 | ||
847ec80b JC |
1673 | subsys_initcall(iio_init); |
1674 | module_exit(iio_exit); | |
1675 | ||
c8b95952 | 1676 | MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>"); |
847ec80b JC |
1677 | MODULE_DESCRIPTION("Industrial I/O core"); |
1678 | MODULE_LICENSE("GPL"); |